(19)
(11)EP 2 876 321 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
23.12.2020 Bulletin 2020/52

(21)Application number: 14194076.7

(22)Date of filing:  20.11.2014
(51)International Patent Classification (IPC): 
F16C 33/46(2006.01)
F16C 33/58(2006.01)
F16C 33/51(2006.01)
F16C 43/08(2006.01)

(54)

Split cage and roller bearing

Geteilter Käfig und Wälzlager

Cage divisée et palier à rouleaux


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 25.11.2013 JP 2013242776

(43)Date of publication of application:
27.05.2015 Bulletin 2015/22

(73)Proprietor: JTEKT CORPORATION
Osaka-shi, Osaka 542-8502 (JP)

(72)Inventor:
  • Yasuda, Hirotaka
    Osaka-shi, Osaka, 542-8502 (JP)

(74)Representative: Winter, Brandl, Fürniss, Hübner, Röss, Kaiser, Polte - Partnerschaft mbB 
Patent- und Rechtsanwaltskanzlei Alois-Steinecker-Straße 22
85354 Freising
85354 Freising (DE)


(56)References cited: : 
DE-A1-102012 207 529
JP-A- 2007 263 304
US-A- 5 295 749
DE-U1- 7 935 207
JP-U- H 053 644
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    BACKGROUND OF THE INVENTION


    1. Field of the Invention



    [0001] The invention relates to a roller bearing having a split cage.

    2. Description of the Related Art



    [0002] As a cage that holds a plurality of rollers, which roll between an inner ring and an outer ring of a roller bearing, at prescribed intervals along the circumferential direction of the cage, there is a conventional split cage formed of a plurality of cage segments arranged in the circumferential direction (refer to, for example, Japanese Patent Application Publication No. 2011-133061). As this type of split cage, there is often adopted a cage of a roller guidance type, of which the turning is guided by rollers in order to prevent abrasion of the cage due to contact with inner and outer rings. In a split cage of the roller guidance type, each cage segment has a pocket that accommodates a roller, and each pocket has an insertion opening through which the roller is inserted into the pocket from one of the radially outside and the radially inside.

    [0003] In the split cage of the roller guidance type, a single roller is accommodated in a single pocket of each cage segment. Thus, when the cage segment is displaced to the other one of the radially outside and the radially inside due to, for example, vibrations, that is, when the insertion opening of the cage segment is displaced in such a direction that the roller comes out of the insertion opening, there is a possibility that the cage segment may be detached from the roller to cause breakage of the cage segment. A roller bearing having the features of the preamble of claim 1 is known from DE 10 2012 207529 A1.

    SUMMARY OF THE INVENTION



    [0004] One object of the invention is to provide a roller bearing configured to prevent a cage segment from being detached from a roller to cause breakage of the cage segment. The object is achieved by the subject matter of claim 1. Advantageous further developments are subject-matter of the dependent claim.

    [0005] A split cage in a roller bearing according to an aspect of the invention includes a plurality of cage segments, each of the cage segments having a pair of rim portions that face each other at a prescribed distance in an axial direction of the split cage, and a pair of cage bar portions disposed between the rim portions to connect the rim portions to each other, the cage bar portions and the rim portions defining a single pocket that accommodates a single roller, the pocket having an insertion opening through which the roller is inserted into the pocket from one of a radially outside and a radially inside. Turning of each of the cage segments is guided by the roller, the cage segments being arranged in a circular pattern along a circumferential direction of the split cage, in an annular space between an inner ring and an outer ring. Each of the cage segments has projections formed so as to project toward the other one of the radially outside and the radially inside, the projections being formed at both the rim portions and the cage bar portions, or at the rim portions or the cage bar portions. A projecting length of each of the projections is set to such a length that the projections are brought into contact with an outer peripheral side portion of the inner ring or an inner peripheral side portion of the outer ring, which is located on the other one of the radially outside and the radially inside, before the cage segment is detached from the roller when the cage segment is displaced to the other one of the radially outside and the radially inside.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0006] The foregoing and further features and advantages of the invention will become apparent from the following description of example embodiments with reference to the accompanying drawings, wherein like numerals are used to represent like elements and wherein:

    FIG. 1 is a sectional view illustrating main portions of a tapered roller bearing provided with a split cage according to a first embodiment of the invention;

    FIG. 2 is a side view illustrating the tapered roller bearing;

    FIG. 3 is a perspective view illustrating one of cage segments that constitute the split cage;

    FIG. 4 is a sectional view taken along the line A-A in FIG. 3;

    FIG. 5 is a sectional view illustrating the state where the cage segment is displaced radially outward due to thermal expansion;

    FIG. 6A and FIG 6B illustrate the state where the cage segment starts rotating in one direction, wherein FIG. 6A is a side view and FIG 6B is a sectional view;

    FIG. 7A and FIG. 7B illustrate the state where the cage segment starts rotating in the other direction, wherein FIG. 7A is a side view and FIG. 7B is a sectional view;

    FIG. 8A and FIG. 8B illustrate the state where the cage segment is displaced radially inward, wherein FIG 8A is a side view and FIG. 8B is a sectional view;

    FIG. 9 is a sectional view illustrating main portions of a tapered roller bearing provided with a split cage according to a first example that is not part of the invention;

    FIG. 10 is a perspective view illustrating one of cage segments that constitute the split cage according to the first example;

    FIG. 11A is a side view illustrating the state where the cage segment according to the first example starts rotating in one direction;

    FIG. 11B is a side view illustrating the state where the cage segment according to the first example starts rotating in the other direction;

    FIG. 12 is a side view illustrating the state where the cage segment according to the first example is displaced radially inward;

    FIG. 13 is a sectional view illustrating main portions of a tapered roller bearing provided with a split cage according to a second example that is not part of the invention;

    FIG. 14 is a perspective view illustrating one of cage segments that constitute the split cage according to the second example;

    FIG. 15 is a sectional view taken along the line B-B in FIG. 14;

    FIG. 16A is a side view illustrating the state where the cage segment according to the second example starts rotating in one direction;

    FIG. 16B is a side view illustrating the state where the cage segment according to the second example starts rotating in the other direction; and

    FIG. 17 is a side view illustrating the state where the cage segment according to the second example is displaced radially outward.


    DETAILED DESCRIPTION OF EMBODIMENTS



    [0007] Hereinafter, example embodiments of the invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view illustrating main portions of a tapered roller bearing 1 provided with a split cage 5 according to a first embodiment of the invention. The tapered roller bearing 1 according to the present embodiment includes an inner ring 2, an outer ring 3, a plurality of tapered rollers 4 and the split cage 5. The tapered rollers 4 are rollably disposed in an annular space between the inner ring 2 and the outer ring 3. The split cage 5 holds the tapered rollers 4.

    [0008] The inner periphery of the outer ring 3 has an outer ring raceway surface 3a, which is a tapered face, such that the tapered rollers 4 roll. The outer periphery of the inner ring 2 has an inner ring raceway surface 2a, which is a taped face, at such a position that the inner ring raceway surface 2a faces the outer ring raceway surface 3a such that the tapered rollers 4 roll. Lubricant such as grease is applied to the total circumference of each of the outer ring raceway surface 3a and the inner ring raceway surface 2a. The outer periphery of the inner ring 2 has a large rib portion 2b and a small rib portion 2c disposed across the inner ring raceway surface 2a. The large rib portion 2b projects radially outward and is in contact with a first end face 4a of the tapered roller 4, which is located on one side in the axial direction. The small rib portion 2c projects radially outward and may be in contact with a second end face 4b of the tapered roller 4, which is located on the other side in the axial direction.

    [0009] FIG. 2 is a side view illustrating the tapered roller bearing 1. FIG. 3 is a perspective view illustrating one of cage segments 6 that constitute the split cage 5. The split cage 5 is formed by arranging, in a circular pattern, a plurality of the cage segments 6 along the circumferential direction in an annular space between the inner ring 2 and the outer ring 3. Turning of each cage segment 6 is guided by the tapered roller 4. Thus, a prescribed clearance S1 in the radial direction is formed between the radially inner face of each of the cage segments 6 and the outer peripheral face of the inner ring 2, and a prescribed clearance S2 in the radial direction is formed between the radially outer face of each of the cage segments 6 and the inner peripheral face of the outer ring 3. In addition, a prescribed clearance S3 in the circumferential direction is formed between the cage segments 6 that are adjacent to each other.

    [0010] Each cage segment 6 is a single-piece member formed by molding synthetic resin into a rectangular frame shape by injection molding. Each cage segment 6 has a first rim portion 21, a second rim portion 22, a first cage bar portion 23, and a second cage bar portion 24. The first rim portion 21 and the second rim portion 22 face each other at a prescribed distance in the axial direction. Each of the first cage bar portion 23 and the second cage bar portion 24 is disposed between the first rim portion21 and the second rim portion 22 to connect the first rim portion 21 and the second rim portion 22 to each other. Each cage segment 6 has a single pocket 25 that accommodates a single tapered roller 4, and that is defined by the rim portions 21, 22, and the cage bar portions 23, 24.

    [0011] FIG. 4 is a sectional view taken along the line A-A in FIG. 3. As illustrated in FIG. 3 and FIG. 4, an insertion opening 25a is formed at a radially outer side portion of the pocket 25, and the tapered roller 4 is inserted, from the radially outside, into the pocket 25 through the insertion opening 25a. The cage bar portions 23, 24 have pocket-side faces 23a, 24a (described later), respectively, and roundly-chamfered portions 23a3, 24a3 are formed at radially outer end portions of the pocket-side faces 23a, 24a, respectively, to allow the tapered roller 4 to be easily inserted into the pocket 25 through the insertion opening 25a.

    [0012] Pocket 25-side side faces of the cage bar portions 23, 24 are respectively used as the pocket-side faces 23a, 24a that can be in sliding contact with an outer peripheral face 4c of the tapered roller 4. The pocket-side faces 23a, 24a have inner tilted faces 23a1, 24a1, and outer tilted faces 23a2, 24a2 that are located radially outward of the inner tilted faces 23a1, 24a1, respectively.

    [0013] The inner tilted faces 23a1, 24a1 are formed so as to be tilted such that part of each of the inner tilted faces 23a1, 24a1 except radially inner ends b1, b2 of the pocket-side faces 23a, 24a is in line contact with the outer peripheral face 4c of the tapered roller 4. The outer tilted faces 23a2, 24a2 are formed so as to be tilted such that part of each of the outer tilted faces 23a2, 24a2 except radially outer ends c1, c2 of the pocket-side faces 23a, 24a is in line contact with the outer peripheral face 4c of the tapered roller 4.

    [0014] Thus, in normal times, the outer peripheral face 4c of the tapered roller 4 is brought into contact with the inner tilted faces 23a1, 24a1 and the outer tilted face 23a2, 24a2, and it is therefore possible to prevent the tapered roller 4 from being brought into contact with the radially inner ends b1, b2 and the radially outer ends c1, c2 of the pocket-side faces 23a, 24a. As a result, it is possible to prevent breakage of the cage segment 6 due to contact of the tapered roller 4 with the radially inner ends b1, b2 and the radially outer ends c1, c2 of the pocket-side faces 23a, 24a.

    [0015] As illustrated in FIG. 4, radial clearances S4, S5 are formed between the inner tilted faces 23a1, 24a1 that are radially inner portions of the pocket-side faces 23a, 24a, respectively, and the outer peripheral face 4c of the tapered roller 4. The radial clearances S4, S5 are each set larger than a change amount Δd of a pitch circle radius of the cage segment 6 when the cage segment 6 is displaced radially outward (upward in FIG. 4) due to thermal expansion.

    [0016] As a result, as illustrated in FIG. 5, even if the cage segment 6 is displaced radially outward by the change amount Δd due to thermal expansion, a radial clearance still remains between the inner tilted faces 23a1, 24a1 of the pocket-side faces 23a, 24a and the outer peripheral face 4c of the tapered roller 4. Thus, it is possible to prevent the inner tilted faces 23a1, 24a1 from being pushed by the outer peripheral face 4c of the tapered roller 4. Thus, even if clearance loss occurs, that is, the clearance S3 between the adjacent cage segments 6 in the circumferential direction (refer to FIG. 2) is eliminated due to thermal expansion of the cage segments 6 and the cage segment 6 is displaced radially outward, it is possible to prevent occurrence of abnormal abrasion of the pocket-side faces 23a, 24a of the cage segment 6.

    [0017] As illustrated in FIG. 3, a first projection 26 and a second projection 27 that project radially inward are formed integrally with respective longitudinal (circumferential) end portions of the radially inner face of the first rim portion 21 of the cage segment 6. Similarly, a third projection 28 and a fourth projection 29 that project radially inward are formed integrally with respective longitudinal (circumferential) end portions of the radially inner face of the second rim portion 22 of the cage segment 6.

    [0018] FIG. 6A and FIG. 6B illustrate the state where the cage segment 6 starts rotating in one direction. FIG. 6A is a side view, and FIG. 6B is a sectional view. As illustrated in FIG. 6B, a projecting length L1 of the first projection 26 is set to such a length that the first projection 26 is brought into contact with the outer peripheral face of the large rib portion 2b of the inner ring 2 when the cage segment 6 starts rotating in one direction (clockwise direction in FIG. 6B) about the axis of the tapered roller 4. In addition, as illustrated in FIG. 6A, a projecting length L3 of the third projection 28 is set to such a length that the third projection 28 is brought into contact with the outer peripheral face of the small rib portion 2c of the inner ring 2 when the cage segment 6 starts rotating in the one direction.

    [0019] Thus, when the cage segment 6 starts rotating in the one direction, the first projection 26 and the third projection 28 are brought into contact with the outer peripheral faces of the large rib portion 2b and the small rib portion 2c of the inner ring 2, respectively. As a result, it is possible to prevent the cage segment 6 from further rotating in the one direction. Thus, it is possible to prevent the cage segment 6 from being entangled with the tapered roller 4 due to the rotation of the cage segment 6 to cause breakage of the cage segment 6.

    [0020] FIG. 7A and FIG. 7B illustrate the state where the cage segment 6 starts rotating in the other direction. FIG. 7A is a side view, and FIG. 7B is a sectional view. As illustrated in FIG. 7B, a projecting length L2 of the second projection 27 is set to such a length that the second projection 27 is brought into contact with the outer peripheral face of the large rib portion 2b of the inner ring 2 when the cage segment 6 starts rotating in the other direction (counterclockwise direction in FIG. 7B) about the axis of the tapered roller 4. In addition, as illustrated in FIG. 7A, a projecting length L4 of the fourth projection 29 is set to such a length that the fourth projection 29 is brought into contact with the outer peripheral face of the small rib portion 2c of the inner ring 2 when the cage segment 6 starts rotating in the other direction.

    [0021] Thus, when the cage segment 6 starts rotating in the other direction, the second projection 27 and the fourth projection 29 are brought into contact with the outer peripheral faces of the large rib portion 2b and the small rib portion 2c of the inner ring 2, respectively. As a result, it is possible to prevent the cage segment 6 from further rotating in the other direction. Thus, it is possible to prevent the cage segment 6 from being entangled with the tapered roller 4 due to the rotation of the cage segment 6 to cause breakage of the cage segment 6.

    [0022] FIG. 8A and FIG. 8B illustrate the state where the cage segment 6 is displaced radially inward. FIG. 8A is a side view, and FIG. 8B is a sectional view. As illustrated in FIG. 8B, each of the projecting lengths L1, L2 of the first and second projections 26, 27 is set to such a length that the first and second projections 26, 27 are brought into contact with the outer peripheral face of the large rib portion 2b of the inner ring 2 before the cage segment 6 is detached from the tapered roller 4, when the cage segment 6 is displaced radially inward, that is, when the insertion opening 25a of the pocket 25 is displaced in such a direction that the tapered roller 4 comes out of the insertion opening 25a. Similarly, as illustrated in FIG. 8A, each of the projecting lengths L3, L4 of the third and fourth projections 28, 29 is set to such a length that the third and fourth projections 28, 29 are brought into contact with the outer peripheral face of the small rib portion 2c of the inner ring 2 before the cage segment 6 is detached from the tapered roller 4, when the cage segment 6 is displaced radially inward.

    [0023] Thus, when the cage segment 6 is displaced radially inward due to, for example, vibrations, the first and second projections 26, 27 and the third and fourth projections 28, 29 are brought into contact with the outer peripheral face of the large rib portion 2b of the inner ring 2 and the outer peripheral face of the small rib portion 2c of the inner ring 2, respectively, before the cage segment 6 is detached from the tapered roller 4. As a result, it is possible to prevent the cage segment 6 from being detached from the tapered roller 4 to cause breakage of the cage segment 6.

    [0024] When the cage segment 6 starts rotating, or when the cage segment 6 is displaced radially inward due to, for example, vibrations, the first and second projections 26, 27 and the third and fourth projections 28, 29 are brought into contact with the outer peripheral face of the large rib portion 2b of the inner ring 2 and the outer peripheral face of the small rib portion 2c of the inner ring 2, respectively, Thus, it is possible to prevent lubricant on the inner ring raceway surface 2a from being peeled off by the first to fourth projections 26 to 29.

    [0025] FIG. 9 is a sectional view illustrating main portions of a tapered roller bearing 1 provided with a split cage 5 according to a first example that is not part of the invention. FIG. 10 is a perspective view illustrating one of cage segments 6 that constitute the split cage 5. In the cage segment 6 and third projections 26, 28 and second and fourth projections 27, 29 are formed so as to project from the radially inner face of the second cage bar portion 24 and the radially inner face of the first cage bar portion 23, respectively. Specifically, the second projection 27 and the fourth projection 29 that project radially inward are formed integrally with respective longitudinal (axial) end portions of the radially inner face of the first cage bar portion 23. Similarly, the first projection 26 and the third projection 28 that project radially inward are formed integrally with respective longitudinal (axial) end portions of the radially inner face of the second cage bar portion 24.

    [0026] FIG. 11A is a side view illustrating the state where the cage segment 6 according to the present example starts rotating in one direction. As illustrated in FIG. 11A, each of the projecting lengths L1, L3 of the first and third projections 26, 28 is set to such a length that the first and third projections 26, 28 are brought into contact with the inner ring raceway surface 2a when the cage segment 6 starts rotating in one direction (clockwise direction in FIG. 11A) about the axis of the tapered roller 4. Thus, when the cage segment 6 starts rotating in the one direction, the first projection 26 and the third projection 28 are brought into contact with the inner ring raceway surface2a. As a result, it is possible to prevent the cage segment 6 from further rotating in the one direction.

    [0027] FIG. 11B is a side view illustrating the state where the cage segment 6 according to the present example starts rotating in the other direction. As illustrated in FIG. 11B, each of the projecting lengths L2, L4 of the second and fourth projections 27, 29 is set to such a length that the second and fourth projections 27, 29 are brought into contact with the inner ring raceway surface 2a when the cage segment 6 starts rotating in the other direction (counterclockwise direction in FIG. 11B) about the axis of the tapered roller 4. Thus, when the cage segment 6 starts rotating in the other direction, the second projection 27 and the fourth projection 29 are brought into contact with the inner ring raceway surface 2a. As a result, it is possible to prevent the cage segment 6 from further rotating in the other direction.

    [0028] FIG. 12 is a side view illustrating the state where the cage segment 6 is displaced radially inward. As illustrated in FIG. 12, each of the projecting lengths L1 to L4 of the first to fourth projections 26 to 29 is set to such a length that the first to fourth projections 26 to 29 are brought into contact with the inner ring raceway surface 2a before the cage segment 6 is detached from the tapered roller 4, when the cage segment 6 is displaced radially inward.

    [0029] Thus, when the cage segment 6 is displaced radially inward due to, for example, vibrations, the first to fourth projections 26 to 29 are brought into contact with the inner ring raceway surface 2a before the cage segment 6 is detached from the tapered roller 4. As a result, it is possible to prevent the cage segment 6 from being detached from the tapered roller 4 to cause breakage of the cage segment 6. Note that, the features that are not described in the first example are the same as those in the first embodiment.

    [0030] FIG. 13 is a sectional view illustrating main portions of a tapered roller bearing 1 provided with a split cage 5 according to a second example that is not part of the invention. FIG. 14 is a perspective view illustrating one of cage segments 6 that constitute the split cage 5. In the cage segment 6 first and third projections 26, 28 and second and fourth projections 27, 29 are formed so as to project from the radially outer face of the second cage bar portion 24 and the radially outer face of the first cage bar portion 23, respectively. Specifically, the second projection 27 and the fourth projection 29 that project radially outward are formed integrally with respective longitudinal (axial) end portions of the radially outer face of the first cage bar portion 23. Similarly, the first projection 26 and the third projection 28 that project radially outward are formed integrally with respective longitudinal (axial) end portions of the radially outer face of the second cage bar portion 24.

    [0031] FIG. 15 is a sectional view taken along the line B-B in FIG. 14. As illustrated in FIG. 14 and FIG. 15, an insertion opening 25a is formed at a radially inner side portion of the pocket 25, and the tapered roller 4 is inserted, from the radially inside, into the pocket 25 through the insertion opening 25a. The cage bar portions 23, 24 have pocket-side faces 23a, 24a, respectively, and roundly-chamfered portions 23a3, 24a3 are formed at radially inner end portions of the pocket-side faces 23a, 24a, respectively, to allow the tapered roller 4 to be easily inserted into the pocket 25 through the insertion opening 25a.

    [0032] FIG. 16A is a side view illustrating the state where the cage segment 6 according to the present example starts rotating in one direction. As illustrated in FIG. 16A, each of projecting lengths L2, L4 of the second and fourth projections 27, 29 is set to such a length that the second and fourth projections 27, 29 are brought into contact with the outer ring raceway surface 3a when the cage segment 6 starts rotating in one direction (clockwise direction in FIG. 16A) about the axis of the tapered roller 4. Thus, when the cage segment 6 starts rotating in the one direction, the second projection 27 and the fourth projection 29 are brought into contact with the outer ring raceway surface 3a. As a result, it is possible to prevent the cage segment 6 from further rotating in the one direction.

    [0033] FIG. 16B is a side view illustrating the state where the cage segment 6 according to the present example starts rotating in the other direction. As illustrated in FIG. 16B, each of projecting lengths L1, L3 of the first and third projections 26, 28 is set to such a length that the first and third projections 26, 28 are brought into contact with the outer ring raceway surface 3a, when the cage segment 6 starts rotating in the other direction (counterclockwise direction in FIG. 16B) about the axis of the tapered roller 4. Thus, when the cage segment 6 starts rotating in the other direction, the first projection 26 and the third projection 28 are brought into contact with the outer ring raceway surface 3a. As a result, it is possible to prevent the cage segment 6 from further rotating in the other direction.

    [0034] FIG. 17 is a side view illustrating the state where the cage segment 6 is displaced radially outward. As illustrated in FIG. 17, each of the projecting lengths L1 to L4 of the first to fourth projections 26 to 29 is set to such a length that the first to fourth projections 26 to 29 are brought into contact with the outer ring raceway surface 3a before the cage segment 6 is detached from the tapered roller 4, when the cage segment 6 is displaced radially outward, that is, the insertion opening 25a of the pocket 25 is displaced in such a direction that the tapered roller 4 comes out of the insertion opening 25a.

    [0035] Thus, when the cage segment 6 is displaced radially outward due to, for example, vibrations, the first to fourth projections 26 to 29 are brought into contact with the outer ring raceway surface 3a before the cage segment 6 is detached from the tapered roller 4. As a result, it is possible to prevent the cage segment 6 from being detached from the tapered roller 4 to cause breakage of the cage segment 6. Note that, the features that are not described in the second example are the same as those in the first embodiment.

    [0036] The invention is not limited to the embodiment described above, and may be implemented in various other embodiments. For example, in the embodiment described above, two projections are formed on each of the rim portions 21, 22 of the cage segment 6. However, three or more projections may be formed on each of the rim portions 21, 22 of the cage segment 6

    [0037] With the split cage according to the invention, it is possible to prevent the cage segment from being detached from the roller to cause breakage of the cage segment.


    Claims

    1. A roller bearing (1) comprising:

    a tapered roller (4);

    an inner ring (2), wherein the outer periphery of the inner ring (2) has a large rib portion (2b) and a small rib portion (2c) disposed across the inner ring raceway surface (2a), the large rib portion (2b) projects radially outward and is in contact with a first end face (4a) of the tapered roller (4), which is located on one side in the axial direction, and the small rib portion (2c) projects radially outward and may be in contact with a second end face (4b) of the tapered roller (4), which is located on the other side in the axial direction;

    an outer ring (3); and

    a split cage (5) comprising a plurality of cage segments (6), each of the cage segments having a pair of rim portions (21, 22) that face each other at a prescribed distance in an axial direction of the split cage (5), and a pair of cage bar portions (23, 24) disposed between the rim portions (21, 22) to connect the rim portions (21, 22) to each other, the cage bar portions (23, 24) and the rim portions (21, 22) defining a single pocket (25) that accommodates a single roller (4), the pocket (25) having an insertion opening (25a) through which the roller (4) is inserted into the pocket (25) from one of a radially outside and a radially inside, wherein:

    a pocket-side side face (23a, 24a) of each of the cage bar portions (23, 24) is a pocket-side face (23a, 24a) that is allowed to be in sliding contact with an outer peripheral face (4c) of the roller (4);

    turning of each of the cage segments (6) is guided by the roller (4), the cage segments (6) being arranged in a circular pattern along a circumferential direction of the split cage (5), in an annular space between an inner ring (2) and an outer ring (3); and

    a circumferential clearance (S3) is provided between adjacent cage segments (6), a radial clearance (S1) is formed between the radially inner face of each of the cage segments (6) and the outer peripheral face of the inner ring (2), and a radial clearance (S2) is formed between the radially outer face of each of the cage segments (6) and the inner peripheral face of the outer ring (3); characterized in that

    a first projection (26) and a second projection (27) that project radially inward are formed integrally with respective longitudinal end portions of the radially inner face of the first rim portion (21);

    a third projection (28) and a fourth projection (29) that project radially inward are formed integrally with respective longitudinal end portions of the radially inner face of the second rim portion (22);

    a projecting length (L1) of the first projection (26) is set to such a length that the first projection (26) is brought into contact with the outer peripheral face of the large rib portion (2b) when the cage segment (6) starts rotating in one direction about the axis of the roller (4),

    a projecting length (L3) of the third projection (28) is set to such a length that the third projection (28) is brought into contact with the outer peripheral face of the small rib portion (2c) when the cage segment (6) starts rotating in the one direction;

    a projecting length (L2) of the second projection (27) is set to such a length that the second projection (27) is brought into contact with the outer peripheral face of the large rib portion (2b) when the cage segment (6) starts rotating in the other direction about the axis of the tapered roller (4); and

    a projecting length (L4) of the fourth projection (29) is set to such a length that the fourth projection (29) is brought into contact with the outer peripheral face of the small rib portion (2c) when the cage segment (6) starts rotating in the other direction,

    the projecting lengths (L1, L2, L3, L4) being set such that the respective contacts are made before the cage segment is detached from the roller (4) when the cage segment (6) is displaced to the radially inside.


     
    2. The roller bearing according to claim 1, wherein:
    the pocket-side face has an inner tilted face (23a1, 24a1) that is formed so as to be tilted such that part of the inner tilted face (23a1, 24a1) except a radially inner end (b1, b2) of the pocket-side face (23a, 24a) is in contact with the outer peripheral face (4c) of the roller (4), and an outer tilted face (23a2, 24a2) that is formed at a position radially outward of the inner tilted face (23a1, 24a1) so as to be tilted such that part of the outer tilted face (23a2, 24a2) except a radially outer end of the pocket-side face (23a, 24a) is in contact with the outer peripheral face (4c) of the roller (4).
     


    Ansprüche

    1. Rollenlager (1) mit
    einer Kegelrolle (4);
    einem Innenring (2), wobei der Außenumfang des Innenrings (2) einen großen Rippenabschnitt (2b) und einen kleinen Rippenabschnitt (2c) aufweist, die über die Innenring-Laufbahnfläche (2a) angeordnet sind, wobei der große Rippenabschnitt (2b) radial nach außen vorsteht und in Kontakt mit einer ersten Endfläche (4a) der Kegelrolle (4) steht, die auf einer Seite in axialer Richtung angeordnet ist, und der kleine Rippenabschnitt (2c) radial nach außen vorsteht und mit einer zweiten Endfläche (4b) der Kegelrolle (4) in Kontakt stehen kann, die auf der anderen Seite in axialer Richtung angeordnet ist;
    einem Außenring (3); und
    einem geteilten Käfig (5), der eine Vielzahl von Käfigsegmenten (6) aufweist, wobei jedes der Käfigsegmente ein Paar von Randabschnitten (21, 22), die einander in einem vorgebestimmten Abstand in einer axialen Richtung des geteilten Käfigs (5) zugewandt sind, und ein Paar von Käfigstangenabschnitten (23, 24) aufweist, die zwischen den Randabschnitten (21, 22) angeordnet sind, um die Randabschnitte (21, 22) miteinander zu verbinden, wobei die Käfigstangenabschnitte (23, 24) und die Randabschnitte (21, 22) eine einzelne Tasche (25) definieren, die eine einzelne Rolle (4) aufnimmt, wobei die Tasche (25) eine Einführöffnung (25a) aufweist, durch die die Rolle (4) von einer radialen Außenseite oder einer radialen Innenseite in die Tasche (25) eingeführt wird, wobei:

    eine taschenseitige Seitenfläche (23a, 24a) von jedem der Käfigstangenabschnitte (23, 24) eine taschenseitige Fläche (23a, 24a) ist, die in Gleitkontakt mit einer äußeren Umfangsfläche (4c) der Rolle (4) sein darf;

    eine Drehung jedes der Käfigsegmente (6) durch die Rolle (4) geführt ist, wobei die Käfigsegmente (6) in einem kreisförmigen Muster entlang einer Umfangsrichtung des geteilten Käfigs (5) in einem ringförmigen Raum zwischen dem Innenring (2) und dem Außenring (3) angeordnet sind; und

    ein Umfangsspiel (S3) zwischen benachbarten Käfigsegmenten (6) vorgesehen ist, ein Radialspiel (S1) zwischen der radial inneren Fläche jedes der Käfigsegmente (6) und der äußeren Umfangsfläche des Innenrings (2) gebildet ist, und ein Radialspiel (S2) zwischen der radial äußeren Fläche jedes der Käfigsegmente (6) und der inneren Umfangsfläche des Außenrings (3) gebildet ist; dadurch gekennzeichnet, dass

    ein erster Vorsprung (26) und ein zweiter Vorsprung (27), die radial nach innen vorstehen, einstückig mit jeweiligen Längsendabschnitten der radial inneren Fläche des ersten Randabschnitts (21) ausgebildet sind;

    ein dritter Vorsprung (28) und ein vierter Vorsprung (29), die radial nach innen vorstehen, einstückig mit jeweiligen Längsendabschnitten der radial inneren Fläche des zweiten Randabschnitts (22) ausgebildet sind;

    eine vorstehende Länge (L1) des ersten Vorsprungs (26) auf eine solche Länge eingestellt ist, dass der erste Vorsprung (26) mit der äußeren Umfangsfläche des großen Rippenabschnitts (2b) in Kontakt gebracht wird, wenn das Käfigsegment (6) beginnt, sich in einer Richtung um die Achse der Rolle (4) zu drehen,

    eine vorstehende Länge (L3) des dritten Vorsprungs (28) auf eine solche Länge eingestellt ist, dass der dritte Vorsprung (28) mit der äußeren Umfangsfläche des kleinen Rippenabschnitts (2c) in Kontakt gebracht wird, wenn das Käfigsegment (6) beginnt, sich in der einen Richtung zu drehen;

    eine vorstehende Länge (L2) des zweiten Vorsprungs (27) auf eine solche Länge eingestellt ist, dass der zweite Vorsprung (27) mit der äußeren Umfangsfläche des großen Rippenabschnitts (2b) in Kontakt gebracht wird, wenn das Käfigsegment (6) beginnt, sich in der anderen Richtung um die Achse der Kegelrolle (4) zu drehen; und

    eine vorstehende Länge (L4) des vierten Vorsprungs (29) auf eine solche Länge eingestellt ist, dass der vierte Vorsprung (29) mit der äußeren Umfangsfläche des kleinen Rippenabschnitts (2c) in Kontakt gebracht wird, wenn das Käfigsegment (6) beginnt, sich in der anderen Richtung zu drehen,

    wobei die vorstehende Länge (L1, L2, L3, L4) derart eingestellt sind, dass die jeweiligen Kontakte hergestellt werden, bevor das Käfigsegment von der Rolle (4) gelöst wird, wenn das Käfigsegment (6) radial nach innen verschoben wird.


     
    2. Rollenlager nach Anspruch 1, wobei
    die taschenseitige Fläche eine innere geneigte Fläche (23a1, 24a1) aufweist, die so ausgebildet ist, dass sie derart geneigt ist, dass ein Teil der inneren geneigten Fläche (23a1, 24a1) mit Ausnahme eines radial inneren Endes (b1, b2) der taschenseitigen Fläche (23a, 24a) in Kontakt mit der äußeren Umfangsfläche (4c) der Rolle (4) steht, und eine äußere geneigte Fläche (23a2), 24a2), die an einer Position radial außerhalb der inneren geneigten Fläche (23a1, 24a1) so ausgebildet ist, dass sie derart geneigt ist, dass ein Teil der äußeren geneigten Fläche (23a2, 24a2) mit Ausnahme eines radial äußeren Endes der taschenseitigen Fläche (23a, 24a) in Kontakt mit der äußeren Umfangsfläche (4c) der Rolle (4) steht.
     


    Revendications

    1. Palier à rouleaux (1) comprenant :

    un rouleau progressivement rétréci (4) ;

    une bague interne (2), dans lequel la périphérie externe de la bague interne (2) a une grande partie de nervure (2b) et une petite partie de nervure (2c) disposées de part et d'autre de la surface de chemin de roulement de bague interne (2a), la grande partie de nervure (2b) fait saillie radialement vers l'extérieur et est en contact avec une première face d'extrémité (4a) du rouleau progressivement rétréci (4), qui est positionnée d'un côté dans la direction axiale, et la petite partie de nervure (2c) fait saillie radialement vers l'extérieur et peut être en contact avec une seconde face d'extrémité (4b) du rouleau progressivement rétréci (4), qui est positionnée de l'autre côté dans la direction axiale ;

    une bague externe (3) ; et

    une cage fendue (5) comprenant une pluralité de segments de cage (6), chacun des segments de cage ayant une paire de parties de rebord (21, 22) qui se font face à une distance prescrite dans une direction axiale de la cage fendue (5) et une paire de parties de barre de cage (23, 24) disposées entre les parties de rebord (21, 22) pour raccorder les parties de rebord (21, 22) entre elles, les parties de barre de cage (23, 24) et les parties de rebord (21, 22) définissant une simple poche (25) qui loge un seul rouleau (4), la poche (25) ayant une ouverture d'insertion (25a) à travers laquelle le rouleau (4) est inséré dans la poche (25) à partir de l'un parmi un extérieur radialement et un intérieur radialement, dans lequel :

    une face latérale du côté de la poche (23a, 24a) de chacune des parties de barre de cage (23, 24) est une face du côté de la poche (23a, 24a) qui est autorisée à être en contact coulissant avec une face périphérique externe (4c) du rouleau (4) ;

    la rotation de chacun des segments de cage (6) est guidée par le rouleau (4), les segments de cage (6) étant agencés selon un motif circulaire le long d'une direction circonférentielle de la cage fendue (5), dans un espace annulaire entre une bague interne (2) et une bague externe (3) ; et

    un jeu circonférentiel (S3) est prévu entre des segments de cage (6) adjacents, un jeu radial (S1) est formé entre la face radialement interne de chacun des segments de cage (6) et la face périphérique externe de la bague interne (2), et un jeu radial (S2) est formé entre la face radialement externe de chacun des segments de cage (6) et la face périphérique interne de la bague externe (3) ; caractérisé en ce que :

    une première saillie (26) et une deuxième saillie (27) qui font saillie radialement vers l'intérieur sont formées de manière solidaire avec des parties d'extrémité longitudinales de la face radialement interne de la première partie de rebord (21) ;

    une troisième saillie (28) et une quatrième saillie (29) qui font saillie radialement vers l'intérieur, sont formées de manière solidaire avec des parties d'extrémité longitudinales respectives de la face radialement interne de la seconde partie de rebord (22) ;

    une longueur en saillie (L1) de la première saillie (26) est déterminée à une longueur telle que la première saillie (26) est amenée en contact avec la face périphérique externe de la grande partie de nervure (2b) lorsque le segment de cage (6) commence à tourner dans une direction autour de l'axe du rouleau (4),

    une longueur en saillie (L3) de la troisième saillie (28) est déterminée à une longueur telle que la troisième saillie (28) est amenée en contact avec la face périphérique externe de la petite partie de nervure (2c) lorsque le segment de cage (6) commence à tourner dans la une direction ;

    une longueur en saillie (L2) de la deuxième saillie (27) est déterminée à une longueur telle que la deuxième saillie (27) est amenée en contact avec la face périphérique externe de la grande partie de nervure (2b) lorsque le segment de cage (6) commence à tourner dans l'autre direction autour de l'axe du rouleau progressivement rétréci (4) ; et

    une longueur en saillie (L4) de la quatrième saillie (29) est déterminée à une longueur telle que la quatrième saillie (29) est amenée en contact avec la face périphérique externe de la petite partie de nervure (2c) lorsque le segment de cage (6) commence à tourner dans l'autre direction,

    les longueurs en saillie (L1, L2, L3, L4) étant déterminées de sorte que les contacts respectifs sont réalisés avant que le segment de cage ne soit détaché du rouleau (4) lorsque le segment de cage (6) est déplacé à l'intérieur radialement.


     
    2. Palier à rouleaux selon la revendication 1, dans lequel :
    la face du côté de la poche a une face inclinée interne (23a1, 24a1) qui est formée afin d'être inclinée de sorte qu'une partie de la face inclinée interne (23a1, 24a1), excepté une extrémité radialement interne (b1, b2) de la face du côté de la poche (23a, 24a), est en contact avec la face périphérique externe (4c) du rouleau (4), et une face inclinée externe (23a2, 24a2) qui est formée dans une position radialement vers l'extérieur de la face inclinée interne (23a1, 24a1) afin d'être inclinée de sorte qu'une partie de la face inclinée externe (23a2, 24a2), excepté une extrémité radialement externe de la face du côté de la poche (23a, 24a), est en contact avec la face périphérique externe (4c) du rouleau (4).
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description