(19)
(11)EP 3 388 718 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
03.03.2021 Bulletin 2021/09

(21)Application number: 16872943.2

(22)Date of filing:  06.12.2016
(51)International Patent Classification (IPC): 
F16J 15/3232(2016.01)
F01L 3/08(2006.01)
(86)International application number:
PCT/JP2016/086129
(87)International publication number:
WO 2017/099045 (15.06.2017 Gazette  2017/24)

(54)

VALVE STEM SEAL

VENTILSCHAFTSIEGEL

JOINT D'ÉTANCHÉITÉ DE TIGE DE VANNE


(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: 08.12.2015 JP 2015239102

(43)Date of publication of application:
17.10.2018 Bulletin 2018/42

(60)Divisional application:
19209347.4 / 3628896

(73)Proprietor: NOK Corporation
Tokyo 105-8585 (JP)

(72)Inventors:
  • OYAMA, Takayuki
    Fujisawa-shi, Kanagawa 251-0042 (JP)
  • NISHIMURA, Nobuhiro
    Fukushima-shi Fukushima 960-1193 (JP)
  • ONODERA, Hiroshi
    Fukushima-shi, Fukushima 960-1193 (JP)
  • KISHIRO, Masamichi
    Fukushima-shi, Fukushima 960-1193 (JP)

(74)Representative: TBK 
Bavariaring 4-6
80336 München
80336 München (DE)


(56)References cited: : 
CN-Y- 2 544 105
JP-A- 2003 042 301
JP-A- 2007 218 282
JP-A- H0 968 011
JP-A- 2004 176 881
JP-U- S60 195 912
  
      
    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

    [Technical Field]



    [0001] The present invention relates to a valve stem seal fixed to a valve stem guide which guides a valve stem.

    [Background Art]



    [0002] An intake and exhaust valve system of an internal combustion engine is provided with a valve stem seal for sealing an annular gap between an insertion hole provided in a valve stem guide and a valve stem to be inserted into the insertion hole. A valve stem seal according to a conventional example will be described with reference to Fig. 3. Fig. 3 is a schematic sectional view of the valve stem seal according to the conventional example.

    [0003] A valve stem (not shown) is configured to be inserted into an insertion hole provided in a valve stem guide (not shown) and to be guided by an inner peripheral surface of the insertion hole. A valve stem seal 500 is provided in order to supply suitable amount of lubricating oil for forming an oil film in an annular gap between the insertion hole provided in the valve stem guide and the valve stem while sealing lubricating oil in a lubricating oil chamber.

    [0004] The valve stem seal 500 according to the conventional example includes a reinforcement ring 510 and a rubber-like elastic body 520 integrally provided with the reinforcement ring 510. The rubber-like elastic body 520 includes a seal section 520A which is slidable on the valve stem and a fitting section 520B which is provided on an inner peripheral surface side of a cylindrical body section in the reinforcement ring 510 and which is fitted and fixed to the valve stem guide.

    [0005] In the conventional example, a plurality of annular seal protrusions 521 are provided on an inner peripheral surface of the fitting section 520B in order to improve sealing performance while improving workability when fitting the valve stem seal 500 to the valve stem guide. The seal protrusions 521 include a first inclined surface 521a having a diameter that increases from a radially inward tip toward the seal section 520A and a second inclined surface 521b having a diameter that increases from a radially inward tip opposite the seal section 520A (refer to enlarged view of the seal protrusion 521 in Fig. 3). The first inclined surface 521a and the second inclined surface 521b are designed so that inclinations thereof are equal to one another. With the plurality of seal protrusions 521 configured as described above, penetration of oil (lubricating oil) from a lubricating oil chamber side toward an intake port or an exhaust port can be suppressed while gas leakage from the intake port side or the exhaust port side toward the lubricating oil chamber can be suppressed.

    [0006] However, intake and exhaust pressure (port pressure) of turbo engines and engines with EGR system of recent years has increased. Accordingly, the valve stem seal 500 according to the conventional example is no longer capable of sufficiently preventing gas from leaking from the intake port side or the exhaust port side toward the lubricating oil chamber.

    [0007] CN 2 544 105 Y shows a valve stem seal according to the preamble of claim 1. JP S60-195912 U, JP H09-68011 A and JP 2003-042301 A show further valve stem seals.

    [Citation List]


    [Patent Literature]



    [0008] 

    [PTL 1] Japanese Patent Application Laid-open No. 2004-176881

    [PTL 2] CN 2 544 105 Y

    [PTL 3] JP S60-195912 U

    [PTL 4] JP H09-68011 A

    [PTL 5] JP 2003-042301 A


    [Summary of Invention]


    [Technical Problem]



    [0009] An object of the present invention is to provide a valve stem seal with significantly improved sealing performance while improving workability when fitting the valve stem seal to a valve stem guide.

    [Solution to Problem]



    [0010] In order to solve the problem described above, the present invention adopts the following means.

    [0011] Specifically, a valve stem seal according to the present invention is a valve stem seal which includes:

    a reinforcement ring having a tubular body section; and

    a rubber-like elastic body which is integrally provided with the reinforcement ring,

    the valve stem seal being configured to be fixed to a valve stem guide that guides a valve stem, wherein

    the rubber-like elastic body includes:

    a seal section which is slidable on the valve stem; and

    a fitting section which is provided on an inner peripheral surface of the body section and which is configured to be fitted and fixed to the valve stem guide,

    an inner peripheral surface of the fitting section is provided with a plurality of annular seal protrusions, each including a first inclined surface having a diameter that increases from a radially inward tip toward the seal section and a second inclined surface having a diameter that increases from the radially inward tip toward a side opposite to the seal section, characterized in that

    a first seal protrusion which is closest to the seal section is configured so that an inclination of the second inclined surface is smaller than that of the first inclined surface, and a second seal protrusion which is farthest from the seal section is configured so that an inclination of the first inclined surface is smaller than that of the second inclined surface.



    [0012] Another valve stem seal according to the present invention is a valve stem seal which includes a plurality of said first seal protrusions and a plurality of said second seal protrusions.

    [0013] Another valve stem seal according to the present invention is a valve stem seal which includes:

    a reinforcement ring having a tubular body section; and

    a rubber-like elastic body which is integrally provided with the reinforcement ring,

    the valve stem seal being configured to be fixed to a valve stem guide that guides a valve stem, wherein

    the rubber-like elastic body includes:

    a seal section which is slidable on the valve stem; and

    a fitting section which is provided on an inner peripheral surface of the body section and which is configured to be fitted and fixed to the valve stem guide,

    an inner peripheral surface of the fitting section is provided with a plurality of annular seal protrusions, each including a first inclined surface having a diameter that increases from a radially inward tip toward the seal section and a second inclined surface having a diameter that increases from a radially inward tip toward a side opposite to the seal section, and

    among the plurality of seal protrusions, at least one first seal protrusion arranged on the seal section side is configured so that an inclination of the second inclined surface is smaller than that of the first inclined surface, and among the plurality of seal protrusions, at least one second seal protrusion arranged on a side opposite to the seal section with respect to a region where the first seal protrusion is arranged is configured so that an inclination of the first inclined surface is smaller than that of the second inclined surface.



    [0014] In the present invention, the first seal protrusions are configured so that the inclination of the second inclined surface is smaller than that of the first inclined surface. Therefore, surface pressure by the first seal protrusions against the valve stem guide peaks at a position biased toward the seal section. Due to the first seal protrusions configured as described above, gas leakage from the seal section side toward a side opposite to the seal section can be effectively suppressed.

    [0015] The second seal protrusions are configured so that an inclination of the first inclined surface is smaller than that of the second inclined surface. Therefore, surface pressure by the second seal protrusions against the valve stem guide peaks at a position biased toward a side opposite to the seal section. Due to the second seal protrusions configured as described above, penetration of oil (lubricating oil) from the opposite side to the seal section toward the seal section can be effectively suppressed.

    [0016] As described above, in the present invention, gas leakage can be effectively suppressed by the first seal protrusions arranged on the side of the seal section and penetration of oil can be effectively suppressed by the second seal protrusions arranged on an opposite side to the seal section. Since a plurality of seal protrusions are provided on the inner peripheral surface of the fitting section, workability when fitting the valve stem seal to the valve stem guide can be improved.

    [Advantageous Effects of Invention]



    [0017] As described above, according to the present invention, sealing performance of a valve stem seal can be significantly improved while improving workability when fitting the valve stem seal to a valve stem guide.

    [Brief Description of Drawings]



    [0018] 

    [Fig. 1] Fig. 1 is a schematic sectional view showing a state where a valve stem seal according to an embodiment of the present invention is in use.

    [Fig. 2] Fig. 2 is a schematic sectional view of the valve stem seal according to the embodiment of the present invention.

    [Fig. 3] Fig. 3 is a schematic sectional view of a valve stem seal according to a conventional example.


    [Description of Embodiment]



    [0019]  Hereinafter, a mode for implementing the present invention will be described in detail by way of example of an embodiment with reference to the drawings. However, it is to be understood that dimensions, materials, shapes, relative arrangements, and the like of components described in the embodiment are not intended to limit the scope of the invention thereto unless otherwise specifically noted.

    (Embodiment)



    [0020] A valve stem seal according to an embodiment of the present invention will be described with reference to Figs. 1 and 2. Fig. 1 is a schematic sectional view showing a state where a valve stem seal according to an embodiment of the present invention is in use. It should be noted that Fig. 1 shows a state where the valve stem seal is fixed to a valve stem guide. The valve stem seal and the like in Fig. 1 represent partial sections cut by a plane including a central axis of the valve stem seal. Fig. 2 is a schematic sectional view of the valve stem seal according to the embodiment of the present invention. It should be noted that the valve stem seal has a rotationally symmetrical shape and, in Fig. 2, only half of sections cut by a plane including the central axis of the valve stem seal is shown. In addition, Fig. 2 also shows enlarged views of seal protrusions.

    <Overall configuration of sealing structure>



    [0021] An overall configuration of a sealing structure including a valve stem seal according to the present embodiment will be described particularly with reference to Fig. 1. A valve stem guide 300 is mounted to a cylinder head 400 of an engine. A valve stem 200 is provided so as to be inserted into an insertion hole 310 provided in the valve stem guide 300 and to be guided by an inner peripheral surface of the insertion hole 310. In the diagram, (O) denotes a lubricating oil chamber side and (P) denotes a port side (an intake port side or an exhaust port side). A valve stem seal 100 is provided in order to supply suitable amount of lubricating oil for forming an oil film in an annular gap between the insertion hole 310 provided in the valve stem guide 300 and the valve stem 200 while sealing lubricating oil in a lubricating oil chamber.

    <Valve stem seal>



    [0022] The valve stem seal 100 according to the present embodiment will now be described in detail. The valve stem seal 100 includes a reinforcement ring 10 and a rubber-like elastic body 20 which is integrally provided with the reinforcement ring 10. The reinforcement ring 10 and the rubber-like elastic body 20 can be integrated by integral molding. For example, by performing insert molding of the rubber-like elastic body 20 using the reinforcement ring 10 as an insert, the rubber-like elastic body 20 can be integrally provided with respect to the reinforcement ring 10. The reinforcement ring 10 is made of metal or the like. The reinforcement ring 10 is constituted by a tubular (more specifically, cylindrical) body section 11, an inward flange part 12 provided on one end of the body section 11, and an outward flange part 13 provided on another end of the body section 11.

    [0023] The rubber-like elastic body 20 includes a seal section 20A which is slidable on the valve stem 200 and a fitting section 20B which is provided on an inner peripheral surface side of the body section 11 and which is fitted and fixed to the valve stem guide 300.

    [0024]  The seal section 20A is provided near a tip of the inward flange part 12 of the reinforcement ring 10. The seal section 20A includes a main lip 21 provided on a lubricating oil chamber side (O), a back-pressure lip 22 provided on a port side (P), and an auxiliary lip 23 provided near a base of the main lip 21. An annular recess 24 is provided on an outer peripheral surface side of the main lip 21. A garter spring 150 which presses the main lip 21 against the valve stem 200 is mounted to the annular recess 24 (refer to Fig. 1). A plurality of annular seal protrusions (in the present embodiment, one first seal protrusion 25 and two second seal protrusions 26) are provided on an inner peripheral surface of the fitting section 20B.

    [0025] The valve stem seal 100 configured as described above is fixed to the valve stem guide 300 as the fitting section 20B is fitted to the valve stem guide 300 from the outward flange part 13 side of the reinforcement ring 10. The outward flange part 13 of the reinforcement ring 10 becomes adhered to a top surface 410 of the cylinder head 400. In the present embodiment, the outward flange part 13 is configured to be pressed against the top surface 410 of the cylinder head 400 by a valve spring 160. Accordingly, the valve stem seal 100 is prevented from detaching from the valve stem guide 300 by intake and exhaust pressure (port pressure).

    [0026] In the valve stem seal 100 configured as described above, penetration of oil (lubricating oil) from the lubricating oil chamber side (O) to the port side (P) is suppressed by the main lip 21 in the seal section 20A. Gas leakage from the port side (P) to the lubricating oil chamber side (O) is suppressed by the back-pressure lip 22 in the seal section 20A. Penetration of oil and gas leakage from an annular gap between the fitting section 20B of the valve stem seal 100 and the valve stem guide 300 can be suppressed by the plurality of annular seal protrusions (the first seal protrusion 25 and the second seal protrusions 26) provided on the inner peripheral surface of the fitting section 20B. Penetration of oil (refer to an arrow A in Fig. 1) having entered from between the top surface 410 of the cylinder head 400 and the outward flange part 13 of the reinforcement ring 10 can be suppressed by the plurality of seal protrusions described above. Leakage of gas (refer to an arrow B in Fig. 1) discharged from between the valve stem 200 and the valve stem guide 300 can be suppressed by the plurality of seal protrusions described above.

    <Seal protrusions>



    [0027] The seal protrusions according to the present embodiment will now be described in greater detail. The seal protrusions according to the present embodiment are constituted by the first seal protrusion 25 and the second seal protrusions 26. The first seal protrusion 25 is arranged on the seal section 20A side and the second seal protrusions 26 are arranged on a side opposite to the seal section 20A side with respect to a region in which the first seal protrusion 25 is arranged. Therefore, it is obvious that the seal protrusion closest to the seal section 20A among the plurality of seal protrusions is the first seal protrusion 25 and that the seal protrusion farthest from the seal section 20A among the plurality of seal protrusions are the second seal protrusions 26. In the present embodiment, only one first seal protrusion 25 arranged on the seal section 20A side is provided while two second seal protrusions 26 arranged on the side opposite to the seal section 20A side are provided. The two second seal protrusions 26 are designed so as to have same shapes and dimensions. A configuration is adopted in which an interval between the regions in which the first seal protrusion 25 is arranged and a region in which the second seal protrusions 26 are arranged is sufficiently wider than an interval between the two second seal protrusions 26.

    [0028] Each of the seal protrusions (the first seal protrusion 25 and the second seal protrusions 26) has a first inclined surface (25a and 26a) having a diameter that increases from a radially inward tip toward the seal section 20A, and a second inclined surface (25b and 26b) having a diameter that increases from a radially inward tip opposite the seal section 20A.

    [0029] The first seal protrusion 25 is configured so that an inclination of the second inclined surface 25b is smaller than that of the first inclined surface 25a. In contrast, the two second seal protrusions 26 are both configured so that an inclination of the first inclined surface 26a is smaller than that of the second inclined surface 26b.

    <Advantages of valve stem seal according to present embodiment>



    [0030] With the valve stem seal 100 according to the present embodiment, the first seal protrusion 25 is configured so that an inclination of the second inclined surface 25b is smaller than that of the first inclined surface 25a. Therefore, surface pressure by the first seal protrusion 25 against the valve stem guide 300 peaks at a position biased toward the seal section 20A. Due to the first seal protrusion 25 configured as described above, gas leakage from the seal section 20A side toward a side opposite to the seal section 20A can be effectively suppressed.

    [0031] The second seal protrusions 26 are configured so that an inclination of the first inclined surface 26a is smaller than that of the second inclined surface 26b. Therefore, surface pressure by the second seal protrusions 26 against the valve stem guide 300 peaks at a position biased toward the side opposite to the seal section 20A. Due to the second seal protrusions 26 configured as described above, penetration of oil (lubricating oil) from the side opposite to the seal section 20A toward the seal section 20A can be effectively suppressed.

    [0032] As described above, in the valve stem seal 100 according to the present embodiment, gas leakage can be effectively suppressed by the first seal protrusion 25 arranged on the seal section 20A side and penetration of oil can be effectively suppressed by the second seal protrusions 26 arranged on the side opposite to the seal section 20A. Since a plurality of seal protrusions (the first seal protrusion 25 and the second seal protrusions 26) are provided on the inner peripheral surface of the fitting section 20B, workability when fitting the valve stem seal 100 to the valve stem guide 300 can be improved.

    (Other)



    [0033] The above described valve stem seal 100 according to the present embodiment includes one first seal protrusion 25 in which the inclination of the second inclined surface 25b is smaller than that of the first inclined surface 25a and two second seal protrusions 26 that in which the inclination of the first inclined surface 26a is smaller than that of the second inclined surface 26b. However, in a valve stem seal according to the present invention, if at least one first seal protrusion and at least one second seal protrusion are provided, the number of first seal protrusions and the number of second seal protrusions configured as described above are not limited to the above described example. For example, such a configuration may be adapted in which two first seal protrusions 25 are provided on the seal section 20A side and one second seal protrusion 26 is provided on the side opposite to the seal section 20A with respect to a region in which the two first seal protrusions 25 are arranged. Such a configuration may also be adapted in which two first seal protrusions 25 are provided on the seal section 20A side and two second seal protrusions 26 are provided on the side opposite to the seal section 20A with respect to a region in which the two first seal protrusions 25 are arranged.

    [Reference Signs List]



    [0034] 
    10
    Reinforcement ring
    11
    Body section
    12
    Inward flange part
    13
    Outward flange part
    20
    Rubber-like elastic body
    20A
    Seal section
    20B
    Fitting section
    21
    Main lip
    22
    Back-pressure lip
    23
    Auxiliary lip
    24
    Annular recess
    25
    First seal protrusion
    26
    Second seal protrusion
    25a, 26a
    First inclined surface
    25b, 26b
    Second inclined surface
    100
    Valve stem seal
    150
    Garter spring
    160
    Valve spring
    200
    Valve stem
    300
    Valve stem guide
    310
    Insertion hole
    400
    Cylinder head
    410
    Top surface



    Claims

    1. A valve stem seal (100) comprising:

    a reinforcement ring (10) having a tubular body section; and

    a rubber-like elastic body (20) which is integrally provided with the reinforcement ring,

    the valve stem seal (100) being configured to be fixed to a valve stem guide (300) that guides a valve stem, wherein

    the rubber-like elastic body (20) includes:

    a seal section (20A) which is slidable on the valve stem (200); and

    a fitting section (20B) which is provided on an inner peripheral surface of the body section (11) and which is configured to be fitted and fixed to the valve stem guide (300), and

    an inner peripheral surface of the fitting section (20B) is provided with a plurality of annular seal protrusions (25, 26), each including a first inclined surface (25a, 26a) having a diameter that increases from a radially inward tip toward the seal section (20A) and a second inclined surface (25b, 26b) having a diameter that increases from the radially inward tip toward a side opposite to the seal section (20A), characterized in that

    a first seal protrusion (25) which is closest to the seal section (20A) is configured so that an inclination of the second inclined surface (25b) is smaller than that of the first inclined surface (25a), and a second seal protrusion (26) which is farthest from the seal section (20A) is configured so that an inclination of the first inclined (26a) surface is smaller than that of the second inclined surface (26b).


     
    2. A valve stem seal (100) according to claim 1, comprising a plurality of said first seal protrusions (25) and a plurality of said second seal protrusions (26).
     


    Ansprüche

    1. Ventilschaftdichtung (100) mit:

    einem Verstärkungsring (10), der einen schlauchförmigen Korpusabschnitt hat; und

    einem gummiähnlichen elastischen Körper (20), der mit dem Verstärkungsring einstückig vorgesehen ist,

    der Ventilschaftdichtung (100), die gestaltet ist, um an einer Ventilschaftführung (300) befestigt zu werden, die einen Ventilschaft führt, wobei

    der gummiähnliche elastische Körper (20) beinhaltet:

    einen Abdichtabschnitt (20A) der auf dem Ventilschaft (200) verschiebbar ist; und

    einen Einpassabschnitt (20B), der auf einer inneren Umfangsfläche des Korpusabschnitts (11) vorgesehen ist und der gestaltet ist, um an die Ventilschaftführung (300) gepasst und befestigt zu werden, und

    eine innere Umfangsfläche des Einpassabschnitts (20B) mit einer Mehrzahl an ringförmigen Abdichtvorsprüngen (25, 26) versehen ist, wobei jeder eine erste geneigte Fläche (25a, 26a), die einen Durchmesser hat, der von einer radial nach innen gerichteten Spitze zu dem Abdichtabschnitt (20A) hin zunimmt, und eine zweite geneigte Fläche (25b, 26b) beinhaltet, die einen Durchmesser hat, der von der radial nach innen gerichteten Spitze zu einer Seite gegenüberliegend zu dem Abdichtabschnitt (20A) hin zunimmt, dadurch gekennzeichnet, dass

    ein erster Abdichtvorsprung (25), der sich am nächsten zu dem Abdichtabschnitt (20A) befindet, so gestaltet ist, dass eine Neigung der zweiten geneigten Fläche (25b) kleiner ist als diejenige der ersten geneigten Fläche (25a), und ein zweiter Abdichtvorsprung (26), der sich am weitesten entfernt von dem Abdichtabschnitt (20A) befindet, so gestaltet ist, dass eine Neigung der ersten geneigten (26a) Fläche kleiner ist, als diejenige der zweiten geneigten Fläche (26b).


     
    2. Ventilschaftdichtung (100) nach Anspruch 1, mit einer Mehrzahl an den ersten Abdichtvorsprüngen (25) und einer Mehrzahl an den zweiten Abdichtvorsprüngen (26).
     


    Revendications

    1. Joint d'étanchéité de tige de vanne (100) comprenant :

    une bague de renforcement (10) ayant une section de corps tubulaire ; et

    un corps élastique de type caoutchouc (20) qui est prévu, de manière solidaire, avec la bague de renforcement,

    le joint d'étanchéité de tige de vanne (100) étant configuré pour être fixé sur un guide de tige de vanne (300) qui guide une tige de vanne, dans lequel :
    le corps élastique de type caoutchouc (20) comprend :

    une section de joint d'étanchéité (20A) qui peut coulisser sur la tige de vanne (200) ; et

    une section de raccord (20B) qui est prévue sur une surface périphérique interne de la section de corps (11) et qui est configurée pour être montée et fixée sur le guide de tige de vanne (300), et

    une surface périphérique interne de la section de raccord (20B) est prévue avec une pluralité de saillies de joint d'étanchéité annulaires (25, 26), comprenant chacune une première surface inclinée (25a, 26a) ayant un diamètre qui augmente à partir d'une pointe radialement interne vers la section de joint d'étanchéité (20A) et une seconde surface inclinée (25b, 26b) ayant un diamètre qui augmente de la pointe radialement interne vers un côté opposé à la section de joint d'étanchéité (20A), caractérisé en ce que :
    une première saillie de joint d'étanchéité (25) qui est la plus proche de la section de joint d'étanchéité (20A) est configurée de sorte qu'une inclinaison de la seconde surface inclinée (25b) est plus petite que celle de la première surface inclinée (25a), et une seconde saillie de joint d'étanchéité (26) qui est la plus éloignée de la section de joint d'étanchéité (20A), est configurée de sorte qu'une inclinaison de la première surface inclinée (26a) est inférieure à celle de la seconde surface inclinée (26b).


     
    2. Joint d'étanchéité de tige de vanne (100) selon la revendication 1, comprenant une pluralité desdites premières saillies de joint d'étanchéité (25) et une pluralité desdites secondes saillies de joint d'étanchéité (26).
     




    Drawing














    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description