(19) |
|
|
(11) |
EP 0 651 141 B1 |
(12) |
EUROPEAN PATENT SPECIFICATION |
(45) |
Mention of the grant of the patent: |
|
29.07.1998 Bulletin 1998/31 |
(22) |
Date of filing: 28.10.1994 |
|
|
(54) |
Four-cycle engine
Viertakt-Brennkraftmaschine
Moteur à combustion interne à quatretemps
|
(84) |
Designated Contracting States: |
|
DE FR GB |
(30) |
Priority: |
29.10.1993 JP 294118/93
|
(43) |
Date of publication of application: |
|
03.05.1995 Bulletin 1995/18 |
(60) |
Divisional application: |
|
97114938.0 / 0811756 |
(73) |
Proprietor: YAMAHA HATSUDOKI KABUSHIKI KAISHA |
|
Iwata-shi
Shizuoka-ken, 438 (JP) |
|
(72) |
Inventor: |
|
- Saito, Tetushi
Iwata-shi,
Shizuoka-ken 438 (JP)
|
(74) |
Representative: Grünecker, Kinkeldey,
Stockmair & Schwanhäusser
Anwaltssozietät |
|
Maximilianstrasse 58 80538 München 80538 München (DE) |
(56) |
References cited: :
DE-A- 4 211 896 GB-A- 2 231 087 US-A- 4 957 077 US-A- 5 148 784
|
DE-C- 960 326 US-A- 2 852 009 US-A- 5 074 255
|
|
|
|
|
|
|
|
|
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).
|
[0001] The present invention relates to a four-cycle engine comprising a cylinder block
and a cylinder head, a chain drive means for driving at least one camshaft from the
primary drive shaft, a chain cover extending along a side of the engine and a cooling
arrangement including a water pump for circulating cooling water through the engine,
said chain cover defining at least partially a housing for a water pump.
[0002] Conventionally, in four-cycle engines for automobiles, a water jacket surrounds the
outside of the cylinders, and coolant from the radiator is circulated through this
jacket to cool the engine. A water pump and its drive propel this coolant, which has
become heated after cooling the engine, back to the radiator, where it is cooled,
and then, to return the coolant to the water jacket.
[0003] In general, the water-pump impeller-housing is mounted on the cylinder block so that
said impeller housing connects to a coolant passage linking it with the opening of
the water jacket, and a pulley on the rotating shaft of the impeller is driven by
belt from a crankshaft pulley. Part of the coolant supplied by the water pump is circulated
to the oil cooler.
[0004] However, when attaching the water pump to the engine as-a part of the above described
conventional cooling structure for four-cycle engines, if the side of the engine is
covered by a chain cover, then the cover must go around this area, leaving the water
pump to protrude from the side of the engine. Not only does the water pump protrude
substantially from the engine unit, but attachment of a separate hose to the coolant
passage is required in order that it be able to supply coolant to the oil cooler.
An engine of the type mentioned at the beginning is known from US-A-5 148 784. The
water pump shown there causes the chain cover to bulge outwardly and thus increases
the overall length of the engine.
[0005] Accordingly it is an objective of the present invention to improve a four-cycle engine
as indicated above in that the disposal of the water pump of the cooling arrangement
no longer renders the water pump to substantially protrude from the engine unit, thus
rendering the engine more compact.
[0006] This technical problem is solved by a four-cycle engine according to claim 1.
[0007] The water pump of the cooling arrangement circulating the cooling water through the
cylinder block and cylinder head of the engine being integrated into a chain cover
area itself, which improves the layout and compactness of the engine.
[0008] The water pump can be arranged at the side of the engine along its width where it
is covered by the chain cover of the timer chains of the camshaft drive system. Thus,
the water pump does not protrude from the surface of said chain cover and is integrated
into that side of the engine, thereby rendering it possible to drive the driving pulley
fixed to the pump shaft of the water pump with the belt that additionally drives other
accessory equipment from a crankshaft pulley. Thus, this arrangement also allows the
water pump and other auxiliary equipment in the vicinity of the water pump to be driven
by a single drive belt, which renders the driving system more efficient.
[0009] Moreover, the present invention allows the water pump to be located in close proximity
to an opening for the water jacket in the cylinder block, so that water can be very
efficiently supplied from the water pump housing to the water jacket inside the cylinder
block.
[0010] Preferrably the present invention is useful for a high performance five-valve engine
having three intake valves and two exhaust valves per cylinder.
[0011] Other preferred embodiments of the present invention are laid down in the further
subclaims.
[0012] In the following the present invention is explained in greater detail by means of
embodiments thereof refering a multi-cylinder four-cycle engine, wherein:
Fig. 1, shows a front side view of a multi-cylinder four-cycle engine viewed along
a row of cylinders, indicating the location of the auxiliary equipment positioned
around the engine,
Fig. 2, is a view similar to that of Figure 1 but without the auxiliary equipment
affixed to the engine,
Fig. 3, is a view similar to that of Figures 1 and 2 with the chain cover of a camshaft
timer chain drive system removed,
Fig. 4, is a partial sectional view along the line A-A of Figure 2,
Fig. 5, is a partial sectional view along the line B-B of Figure 2,
Fig. 6, is a partial sectional view along the line C-C of Figure 2,
Fig. 7, is a diagram of the cooling circuit and cooling water circulation from the
water pump shown in Figure 5,
Fig. 8, is a partial side view of the engine similar to Figures 1 to 3 showing the
engine with another embodiment of the water pump attached thereto,
Fig. 9, is a partial side view of the engine similar to Figure 8 with yet another
embodiment of the water pump attached to the engine,
Fig. 10, is an exploded side view of the engine according to Figure 1 showing the
affixation thereof with an assembly bracket.
[0013] Embodiments of the cooling structure of this invention will be described below as
a part of the multi-cylinder four-cycle engine shown in the attached figures.
[0014] Figure 1 shows the location of the auxiliary equipment positioned around the engine,
which is a multi-cylinder four-cycle engine, viewed along the line of cylinders. Located
around the engine 1 are the alternator 2, the power steering pump 3, the air conditioning
compressor 4, etc. These pieces of auxiliary equipment are driven at their respective
rotating shafts 21, 31, 41 by a single belt 7 which connects the various pulleys 12,
22, 32, 42, 52 to that of the engine crankshaft 11. An oil cooler 8 equipped with
a filter unit is mounted at the bottom of the engine 1.
[0015] Figure 2 shows the engine 1 of Figure 1. At the top, the engine 1 is covered by head
cover 13, mounted over the cylinder head 14; on the side, a chain cover 16 covers
the cylinder block 15 (which, in this embodiment, consists of a cylinder block unit
and a crankcase) and on the bottom, an oil pan 17 is mounted under the cylinder block
15. A water pump 5 is affixed to the surface of chain cover 16.
[0016] Figure 3 shows the engine 1 of Figure 2 with the chain cover 16 removed. An inlet
18 is present on the upper part of the side of the cylinder block 15 where the water
pump 5 introduces the coolant, and an inlet 19 is located nearby through which coolant
is introduced into the water jacket, and below is an oil passage 83 through which
oil is introduced into the oil cooler 8. Sprockets 60 are affixed parallel to each
other on the crankshaft 11, and chains 61, 62 engage the teeth on these sprockets,
respectively.
[0017] Said side of the cylinder block 15 where the timer chain transmission for driving
the camshafts 64,65 and the other auxiliary equipment and the water pump 5 is positioned
is disposed closer to an adjacent cylinder of the cylinder block 15 than the opposite
end side of the cylinder block 15 (said side also extending inthe widthwise direction,
not shown in the drawings).
[0018] A lower chain 61 transmits the drive from the rotation of crankshaft 11 to the air
intake camshaft 64 and to the exhaust camshaft 65 by means of an intermediate rotating
shaft 67 and an upper chain 68 at the top of the engine, which is a five valve twin
cam (not shown) engine with three air intake valves and two exhaust valves per cylinder,
causing the camshafts 64, 65 to rotate in this two-stage timing chain configuration.
The chain 62 located near bottom of the engine transmits the drive of the crankshaft
11 to the rotating shaft 63 of an oil pump (not shown) situated inside the oil pan
17.
[0019] The twin chains which rotate the various camshafts 64, 65 of the twin cam valve system
can be adjusted externally by means of a tensioner 71 for the upper chain 68 that
is mounted on the cylinder head 14, and by a tensioner 72 for the lower chain mounted
on the cylinder block 15.
[0020] The tensioner 71 servicing the air intake camshaft 64, the exhaust camshaft 65, and
the intermediate rotating shaft 67 is located slightly farther away than usual from
the center line passing through crankshaft 11 in order to make room for it to be mounted
on the cylinder head 14.
[0021] Now, as shown in Figure 4, the adjoining surfaces 15a, 15b between the side of the
cylinder block 16 and the chain cover are located in mutually offset and parallel
planes of the cross sectional surface. The projecting adjoining surface 15a of the
cylinder block comprises an integral support area 15c projecting from the cylinder
block and supporting a mounting arm 23 of the alternator 2 to allow bolting said alternator
at the support 15c to the affixation area 15d.
[0022] As shown in Figures 3 and 4, a mounting hole 15e passes through the cylinder block
15 below this alternator support area 15c, allowing mounting a cylinder 72c for the
push rod 72b applying pressure to the tension arm 72a of the tensioner 72.
[0023] Generally, the lower chain tensioner 72 is supported at a portion of the cylinder
block 15 which is correspondingly provided at the opposite end side of the cylinder
block 15 (said side also extending in the widthwise direction, not shown in the drawings).
[0024] Figure 6 shows the affixation area on engine 1 for the assembly bracket 9 which allows
the engine 1 to be affixed to the vehicle frame. The mounting bracket 9 is affixed
as jaw-like appendage onto both the cylinder head 14 and the cylinder block 15, and
there are affixation areas 90a, 90b, 90c, and 90d which correspond to the various
affixation areas 10a, 10b, 10c, 10d on the engine 1 to attach the engine 1 to the
frame at the affixation area 91. In addition, the top mounting arm 24 of the alternator
2 bolts onto the affixation area 92.
[0025] In addition to the mounting arm 24 being attached to the affixation area 92 of the
assembly bracket 9 by means of bolts, the alternator 2 is also supported by the mounting
arm 23 below, which is bolted to the affixation area 15d of the alternator support
15c that is integral with the cylinder block, thereby being attached at the top and
bottom with respect to engine 1 as shown in Figure 1.
[0026] This arrangement, namely the lower mounting arm 23 for the alternator 2 increasing
the strength of affixation to the engine, and the upper mounting arm 24 being affixed
to the vehicle by the assembly bracket 9 minimizes engine vibrations in that area,
thereby allowing the accommodation of any future change in alternator specifications
by merely changing the assembly bracket 9 holding such an alternator.
[0027] As has been described above, when the side of the cylinder block 15 of engine 1 is
covered by the chain cover 16 as shown in Figure 2, then the impeller housing 53,
the coolant passage 54 to the water jacket opening 19, and the coolant passage 55
to the oil cooler will be integral on the outside of the chain cover 16, near the
adjoining surface 15b with cylinder block 15, so that the water pump 5 shall be affixed
by bolting on the cover 50.
[0028] As shown in Figure 5, the housing of the water pump 5 is integral in the chain cover
and this housing area is covered by the cover 50, whereby the various coolant passages
54, 55 are made contiguous with the impeller housing 53. The impeller 57 is located
inside the impeller housing 53; the extension of the shaft 51 of impeller 57 to the
outside of the cover 50 allows a pulley 52 to be attached to the end of said shaft
and to be be driven by the crankshaft of engine 1 in order to recirculate coolant
as shown in Figure 7.
[0029] As is shown in Figure 2, with regard to the various coolant passages 54, 55 which
are contiguous with the impeller housing 53 of the water pump 5, the coolant passage
54 leading to the opening 19 for the water jacket is considerably shorter than the
coolant passage 55 leading to the oil cooler 8, and these coolant passages 54, 55
are formed, respectively, in the cover 50 and in the chain cover 16 so that they are
contiguous with the impeller housing 53.
[0030] Just as with the impeller housing 53, the coolant passage 55 leading to the oil cooler
8 is formed in the chain cover 16 and in the cover 50, and the cover 50 extends integrally
downward from the impeller housing, along the surface of the chain cover, to the vicinity
of the oil cooler 8 under the cylinder block 15.
[0031] As is shown in Figure 6, with regard to the flow path of the coolant leading to the
oil cooler 8 from the coolant passage 55 of the water pump 5, the coolant is introduced
into the oil cooler 8 from the end of the coolant passage 55, which is formed by the
chain cover 16 and the cover 50, through the passage 55b in the chain cover 16.
[0032] With regard to the coolant passage 55 leading from the water pump 5 to the oil cooler
8, it is not only possible to form the passage in the chain cover 16 and cover 50,
but as shown in Figure 8, the coolant passage 55 leading to the oil cooler 8 may equally
well be formed integrally on the back side of the chain cover 16. Further, as shown
in Figure 9, the coolant passage 55 to the oil cooler 8 may also be formed in the
cylinder block 15, integral with the structural components of the engine, thereby
eliminating the need for hoses and the like.
[0033] In any of the aforementioned cases, the cross sections of the surfaces 15a, 15b of
the cylinder block 15 adjoining the chain cover are in offset and mutual parallel
planes. Since the water pump 5 is integral with the side adjoining the surface 15b,
compared to the case where the adjoining surface on the cylinder block side lies in
the same plane as the surface on the other side, then the water pump 5, even though
covered by the chain cover 16, does not project as far from the side of the engine
1. And, since it is near the opening 19 leading to the water jacket of the cylinder
block 15, the structure allows the water pump 5 to be driven by engine 1 in a very
compact manner.
[0034] This configuration allows the water pump 5 to be situated in such manner that the
pulley 52 attached to the rotating impeller shaft 51 of the water pump 5 can be efficiently
driven by the crankshaft 11, along with the other auxiliary equipment, by means of
a single belt 7. In addition, this configuration simplifies the structures and improves
the ease of maintenance by eliminating the need for extra parts such as hoses to provide
the coolant passage to the oil cooler.
[0035] As described above, the cooling structure for four-cycle engines of this invention
uses the chain cover that covers the side of the engine as a part of the water pump
so that the water pump does not substantially project from the surface of the chain
cover, and as a result the water pump may be located in close proximity to the opening
for the water jacket in the cylinder block in a compact manner. It also reduces the
number of parts, and eases engine maintenance.
1. Four-cycle engine comprising a cylinder block (15) and a cylinder head (14), a chain
drive means (61,72a) for driving at least one camshaft (64,65) from a primary drive
shaft (11), a chain cover (16) extending along a side of the engine and a cooling
arrangement including a water pump (5) for circulating cooling water through the engine,
said chain cover (16) defining, at least partially, a housing for the water pump (5),
characterized in that said chain cover (16) connects to the cylinder block (15) at both sides of the chain
drive means (61,72a) at parallel planes disposed offset to one another.
2. Four-cycle engine as claimed in claim 1, characterized in that another closure means (50) is provided to cover the water pump and to connect to
the chain cover (16).
3. Four-cycle engine as claimed in claims 1 or 2, characterized in that a drive shaft (51) of the water pump (5) is driven by a pulley (52) which forms part
of an accessory equipment drive means.
4. Four-cycle engine as claimed in claim 3, characterized in that the accessory equipment drive means is a belt (7) drivingly connecting a crankshaft
pulley (12) with a plurality of further accessory drive pulleys (22,32,42,52).
5. Four-cycle engine as claimed in at least one of the preceding claims 1 to 4, characterized in that the chain cover (16) defines part of a cooling water passage (54,55) of the cooling
arrangement.
6. Four-cycle engine as claimed in at least one of the preceding claims 1 to 5, characterized in that the additional closure means is a cover (50) defining part of a cooling water passage
(54,55) of the cooling arrangement.
7. Four-cycle engine as claimed in at least one of the preceding claims 1 to 6, characterized in that the cylinder block (15) comprises an integral projecting support area (15c) to which
an end portion of the chain cover (16) abuts and which is adapted to support a mounting
arm (23) of an altemator (2).
8. Four-cycle engine as claimed in at least one of the preceding claims 1 to 7, characterized in that the water pump (5) is of the impeller type and that an impeller housing (53) of the
water pump (5) is formed by the chain cover (16) and the cover means (50) which, in
turn, covers the water pump (5) and an opening defined by the chain cover (16).
9. Four-cycle engine as claimed in claim 8, characterized in that the water pump (5) is associated to a cooling water inlet (18) provided at an upper
part of the side of the cylinder block (15) where the water pump (5) introduces cooling
water and that a cooling water inlet (19) is located at the area of the chain drive
means (100).
10. Four-cycle engine as claimed in at least one of the preceding claims 1 to 9, characterized in that an oil cooler (8) is attached to a lower side of the cylinder block (15), said cylinder
block (15) comprising an oil passage (83).
11. Four-cycle engine as claimed in claim 10, characterized in that the chain cover (16) and closure means (50) define a cooling water passage (55) extending
substantially downwardly and leading to the oil cooler (8).
12. Four-cycle engine as claimed in at least one of the preceding claims 1 to 11, characterized in that the water pump (5) is bolted to the additional closure means (50).
13. Four-cycle engine as claimed in at least one of the preceding claims 8 to 12, characterized in that the impeller housing (53), the cooling water passage (54) to the cylinder blocks
water jacket opening (19) and the cooling water passage (55) to the oil cooler (8)
are formed integrally by the chain cover (16) and the closure means (50).
14. Four-cycle engine as claimed in at least one of the preceding claims 1 to 13, characterized in that a cooling water passage (55) is directly formed in the chain cover (16).
15. Four-cycle engine as claimed in at least one of the preceding claims 1 to 14, characterized in that a cooling water passage (55) communicating the impeller housing (53) of the water
pump (5) to the oil cooler (8) is formed directly by the cylinder block (15).
16. Four-cycle engine as claimed in at least one of the preceding claims 1 to 15, characterized in that the accessories are attached to a side of the cylinder block (15) and an engine mounting
bracket (9).
17. Four-cycle engine as claimed in claim 16, characterized in that the engine mounting bracket (9) engages both the cylinder block (15) and the cylinder
head (4) of the engine.
18. Four-cycle engine as claimed in at least one of the preceding claims 1 to 17, characterized in that a lower drive chain (61) connects a drive sprocket fixed onto the crankshaft (11)
and to a drive sprocket fixed on the intermediate drive shaft (67) which is rotatably
supported through the cylinder head (4), while an upper chain (68) drives intake and
exhaust camshafts (64,65) from said intermediate drive shaft (67).
19. Four-cycle engine as claimed in claim 18, characterized in that a lower chain tensioner (72) is supported by the cylinder block (15) while an upper
chain tensioner (71) is supported by the cylinder head (14).
20. Four-cycle engine as claimed in at least one of the preceding claims 1 to 19, characterized in that the intermediate drive shaft (67) is disposed laterally offset with respect to the
intake and exhaust camshafts (64,65).
21. Four-cycle engine as claimed in at least one of the preceding claims 1 to 20, characterized in that the engine comprises a plurality of intake valves per cylinder, the number of said
intake valves exceeding the number of exhaust valves per cylinder and that the upper
chain tensioner (71) is disposed at the intake side of the cylinder head (14).
22. Four-cycle engine as claimed in claim 21, characterized in that the intermediate drive shaft (67) is disposed offset towards that side of the engine
opposite ,to the side where the upper chain tensioner (71) is disposed.
23. Four-cycle engine as claimed in at least one of the preceding claims 1 to 22, characterized in that the side of the cylinder block (15) supporting the water pump (5) is disposed closer
to an adjacent cylinder than an opposite side of the cylinder block (15).
24. Four-cycle engine as claimed in claim 19, characterized in that, the lower tensioner (72) is supported through a portion of the cylinder block (15)
which is correspondingly provided at an opposite side of the cylinder block.
1. Viertaktmotor mit einem Zylinderblock (15) und einem Zylinderkopf (14), einer Kettenantriebsvorrichtung
(61,72a) zum Antreiben zumindest einer Nockenwelle (64,65) von einer ersten Antriebswelle
aus (L), einer Kettenabdeckung (16), die sich entlang einer Seite des Motors und einer
Kühlanordnung einschließlich einer Wasserpumpe (5) zur Zirkulierung von Kühlwasser
durch den Motor erstreckt, wobei die Kettenabdeckung (16) zumindest teilweise ein
Gehäuse für die Wasserpumpe (5) bildet, dadurch gekennzeichnet, daß die Kettenabdeckung (16) mit dem Zylinderblock (15) an beiden Seiten der Kettenantriebsvorrichtung
(61,72a) an parallelen, zueinander versetzten Ebenen verbunden ist.
2. Viertaktmotor nach Anspruch 1, dadurch gekennzeichnet, daß eine zusätzliche Verschließvorrichtung
(50) vorgesehen ist zur Abdeckung der Wasserpumpe und zur Verbindung mit der Kettenabdeckung
(16).
3. Viertaktmotor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Antriebswelle (51) der Wasserpumpe (5) über eine Rolle (52) angetrieben
wird, die einen Teil einer Zusatzaggregat-Antriebsvorrichtung bildet.
4. Viertaktmotor nach Anspruch 3, dadurch gekennzeichnet, daß die Zusatzaggregat-Antriebsvorrichtung ein Riemen (7) ist, der eine Kurbelwellen-Rolle
(12) mit einer Vielzahl weiterer Zusatzantriebsrollen (22,32,42,52) antriebsmäßig
verbindet.
5. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Kettenabdeckung (16) einen Teil einer Kühlwasserleitung (54,55) der Kühlanordnung
bildet.
6. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die zusätzliche Verschließvorrichtung eine Abdeckung (50) ist, die einen Teil
einer Kühlwasserleitung (54,55) der Kühlanordnung bildet.
7. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Zylinderblock (15) einen integralen, vorspringenden Stützbereich (15c) aufweist,
an dem ein Endabschnitt der Kettenabdeckung (16) anliegt, und der zur Abstützung eines
Befestigungsarms (23) eines Generators (2) ausgebildet ist.
8. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Wasserpumpe (5) als Turbine ausgebildet ist und daß ein Turbinengehäuse (53)
der Wasserpumpe durch die Kettenabdeckung (16) und die Abdeckvorrichtung (50) gebildet
wird, wobei die Abdeckvorrichtung (50) wiederum die Wasserpumpe (5) und eine Öffnung,
die durch die Kettenabdeckung (16) gebildet wird, abdeckt.
9. Viertaktmotor nach Anspruch 8, dadurch gekennzeichnet, daß die Wasserpumpe (5) einem Kühlwassereinlaß (18) zugeordnet ist, der an einem
oberen Abschnitt der Seite des Zylinderblockes (15) vorgesehen ist, wo die Wasserpumpe
(5) Kühlwasser zuführt, und daß ein Kühlwassereinlaß (19) im Bereich der Kettenantriebsvorrichtung
(100) angeordnet ist.
10. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 9, dadurch gekennzeichnet, daß ein Ölkühler (8) an einer Unterseite des Zylinderblockes (15) angebracht ist,
wobei der Zylinderblock (15) eine Ölleitung (83) aufweist.
11. Viertaktmotor nach Anspruch 10, dadurch gekennzeichnet, daß die Kettenabdeckung (16) und die Verschließvorrichtung (50) eine Kühlwasserleitung
(55) bilden, die sich im wesentlichen nach unten erstreckt und zu dem Ölkühler (8)
führt.
12. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die Wasserpumpe (5) an der zusätzlichen Verschließvorrichtung (50) mit Bolzen
befestigt ist.
13. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 8 bis 12, dadurch gekennzeichnet, daß das Turbinengehäuse (53), die Kühlwasserleitung zu der Zylinderblock-Kühlmantelöffnung
(19) und die Kühlwasserleitung (55) zu dem Ölkühler (8) integral in der Kettenabdeckung
(16) und der Verschließvorrichtung (50) ausgebildet sind.
14. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 13, dadurch gekennzeichnet, daß eine Kühlwasserleitung (55) direkt in der Kettenabdeckung (16) ausgebildet ist.
15. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 14, dadurch gekennzeichnet, daß eine Kühlwasserleitung (55), die das Turbinengehäuse (53) der Wasserpumpe (5)
mit dem Ölkühler (8) verbindet, direkt in dem Zylinderblock (15) ausgebildet ist.
16. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 15, dadurch gekennzeichnet, daß die Zusatzaggregate an einer Seite des Zylinderblocks (15) und an einem Motor-Montagebügel
(9) angebracht sind.
17. Viertaktmotor nach Anspruch 16, dadurch gekennzeichnet, daß der Motor-Montagebügel (9) mit dem Zylinderblock (15) und dem Zylinderkopf (4)
des Motors verbunden ist.
18. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 17, dadurch gekennzeichnet, daß eine untere Antriebskette (61) ein Antriebsritzel, das an der Kurbelwelle (11)
befestigt ist, und ein Antriebsritzel, das an einer drehbar in dem Zylinderkopf (4)
gelagerten Zwischenantriebswelle (67) befestigt ist, verbindet, während eine obere
Kette (68) Einlaß- und Auslaßnockenwellen (64,65) von der Zwischenantriebswelle (67)
antreibt.
19. Viertaktmotor nach Anspruch 18, dadurch gekennzeichnet, daß ein unterer Kettenspanner (72) an dem Zylinderblock (15) abgestützt ist, während
ein oberer Kettenspanner (71) an dem Zylinderkopf (14) abgestütz ist.
20. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 19, dadurch gekennzeichnet, daß die Zwischenantriebswelle (67) seitlich versetzt gegenüber den Einlaß- und Auslaßnockenwellen
(64,65) angeordnet ist.
21. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 20, da durch gekennzeichnet, daß der Motor eine Vielzahl von Einlaßventilen je Zylinder aufweist, wobei je Zylinder
die Anzahl der Einlaßventile die Anzahl der Auslaßventile übersteigt und daß der obere
Kettenspanner (71) auf der Einlaßseite des Zylinderkopfes (14) angeordnet ist.
22. Viertaktmotor nach Anspruch 21, dadurch gekennzeichnet, daß die Zwischenantriebswelle (67) in Richtung der Seite des Motors versetzt angeordnet
ist, die der Seite, an der der obere Kettenspanner (71) angeordnet ist, gegenüberliegt.
23. Viertaktmotor nach zumindest einem der vorgenannten Ansprüche 1 bis 22, dadurch gekennzeichnet, daß die Seite des Zylinderblocks (15), die die Wasserpumpe (5) trägt, näher an einem
benachbarten Zylinder liegt als die gegenüberliegende Seite des Zylinderblocks (15).
24. Viertaktmotor nach Anspruch 19, dadurch gekennzeichnet, daß der untere Kettenspanner (72) durch einen Abschnitt des Zylinderblocks (15) abgestützt
ist, der entsprechend an der gegenüberliegenden Seite des Zylinderblocks vorgesehen
ist.
1. Moteur à quatre temps comprenant un bloc-cylindres (15) et une culasse (14), des moyens
d'entraînement par chaîne (61, 72a), conçus pour entraîner au moins un arbre à cames
(64, 65) à partir d'un arbre d'entraînement primaire (11), un couvercle de chaîne
(16) s'étendant sur un côté du moteur et un dispositif de refroidissement comprenant
une pompe à eau (5), conçue pour faire circuler de l'eau de refroidissement à travers
le moteur, ledit couvercle à chaîne (16) définissant, au moins partiellement, un carter
destiné à la pompe à eau (5), caractérisé en ce que ledit couvercle à chaîne (16)
relie au bloc-cylindres (15) sur les deux côtés des moyens d'entraînement à chaîne
(61, 72a), en des plans parallèles décalés l'un par rapport à l'autre.
2. Moteur à quatre temps selon la revendication 1, caractérisé en ce que d'autres moyens
de fermeture (50) sont prévus pour couvrir la pompe à eau et pour relier au couvercle
à chaîne (16).
3. Moteur à quatre temps selon la revendication 1 ou 2, caractérisé en ce que l'arbre
d'entraînement (51) de la pompe à eau (5) est entraîné par une poulie (52) faisant
partie de moyens d'entraînement d'un équipement accessoire.
4. Moteur à quatre temps selon la revendication 3, caractérisé en ce que les moyens d'entraînement
d'un équipement accessoire sont constitués d'une courroie (7), reliant par entraînement
une poulie de vilebrequin (12), à une pluralité d'autres poulies d'entraînement d'accessoires
(22,32, 42, 52).
5. Moteur à quatre temps selon l'une des revendications 1 à 4 précédentes, caractérisé
en ce que le couvercle de chaîne (16) définit une partie d'un passage d'eau de refroidissement
(54, 55) du dispositif de refroidissement.
6. Moteur à quatre temps selon l'une des revendications 1 à 5 précédentes, caractérisé
en ce que les moyens de fermeture additionnels sont constitués d'un couvercle (50)
définissant une partie d'un passage d'eau de refroidissement (54, 55) du dispositif
de refroidissement.
7. Moteur à quatre temps selon l'une des revendications 1 à 6 précédentes, caractérisé
en ce que le bloc-cylindres (15) comprend une zone support (15c) faisant saillie d'une
seule pièce, sur laquelle une partie extrémité du couvercle de chaîne (16) vient en
butée et qui est adaptée pour supporter un bras de montage (23) d'un alternateur (2).
8. Moteur à quatre temps selon l'une au moins des revendications 1 à 7 précédentes, caractérisé
en ce que la pompe à eau (5) est de type à rotor et en ce que le carter de rotor (53)
de la pompe à eau (5) est formé par le couvercle de chaîne (16) et le moyen de couverture
(50) qui, à son tour, couvre la pompe à eau (5) et une ouverture définie par le couvercle
de chaîne (16).
9. Moteur à quatre temps selon la revendication 8, caractérisé en ce que la pompe à eau
(5) est associée à une entrée d'eau de refroidissement (18), ménagée à la partie supérieure
du côté du bloc-cylindres (15), à l'endroit auquel la pompe à eau (5) introduit de
l'eau de refroidissement et en ce qu'une entrée d'eau de refroidissement (19) est
placée dans la zone des moyens d'entraînement à chaîne (100).
10. Moteur à quatre temps selon l'une des revendications 1 à 9 précédentes, caractérisé
en ce qu'un réfrigérant d'huile (8) est fixé au côté inférieur du bloc-cylindres (15),
ledit bloc-cylindres (15) comprenant un passage d'huile (83).
11. Moteur à quatre temps selon la revendication 10, caractérisé en ce que le couvercle
de chaîne (16) et les moyens de fermeture (50) définissent un passage d'eau (55) s'étendant
sensiblement vers le bas et menant au réfrigérant d'huile (8).
12. Moteur à quatre temps selon l'une des revendications 1 à 11 précédentes, caractérisé
en ce que la pompe à eau (5) est boulonnée sur les moyens de fermeture additionnelle
(50).
13. Moteur à quatre temps selon l'une des revendications 8 à 12 précédentes, caractérisé
en ce que le carter de rotor (53), le passage d'eau de refroidissement (54) allant
à l'ouverture de chemise d'eau (19) du bloc-cylindres et le passage d'eau de refroidissement
(55) allant au réfrigérant d'huile (8) sont formés d'une seule pièce par le couvercle
de chaîne (16) et les moyens de fermeture (50).
14. Moteur à quatre temps selon l'une des revendications 1 à 13 précédentes, caractérisé
en ce qu'un passage d'eau de refroidissement (55) est directement formé dans le couvercle
de chaîne (16).
15. Moteur à quatre temps selon l'une des revendications 1 à 14 précédentes, caractérisé
en ce qu'un passage d'eau de refroidissement (55) faisant communiquer le carter de
rotor (53) de la pompe à eau (5) et le réfrigérant d'huile (8) est formé directement
par le bloc-cylindres (15).
16. Moteur à quatre temps selon l'une des revendications 1 à 15 précédentes, caractérisé
en ce que les accessoires sont fixés sur le côté du bloc-cylindres (15) et un support
de montage moteur (9).
17. Moteur à quatre temps selon la revendication 16, caractérisé en ce que le support
de montage moteur (9) est en prise à la fois avec le bloc-cylindres (15) et la culasse
(4) du moteur.
18. Moteur à quatre temps selon l'une des revendications 1 à 17 précédentes, caractérisé
en ce qu'une chaîne d'entraînement inférieure (61) relie un pignon à chaîne, fixé
sur le vilebrequin (11) et à un pignon à chaîne fixé à l'arbre d'entraînement intermédiaire
(67), monté tournant dans la culasse (4), tandis qu'une chaîne supérieure (68) entraîne
des arbres à cames d'admission et d'échappement (64, 65), à partir dudit arbre d'entraînement
intermédiaire (67).
19. Moteur à quatre temps selon la revendication 18, caractérisé en ce qu'un tendeur de
chaîne inférieure (72) est supporté par le bloc-cylindres (15), tandis qu'un tendeur
de chaîne supérieur (71) est supporté par la culasse (14).
20. Moteur à quatre temps selon l'une des revendications 1 à 19 précédentes, caractérisé
en ce que l'arbre d'entraînement intermédiaire (67) est disposé décalé latéralement
par rapport aux arbres à cames d'admission et d'échappement (64, 65).
21. Moteur à quatre temps selon l'une des revendications 1 à 20 précédentes, caractérisé
en ce que le moteur comprend une pluralité de soupapes d'admission par cylindre, le
nombre desdites soupapes d'admission étant supérieur au nombre de soupapes d'échappement
par cylindre et en ce que le tendeur de chaîne supérieur (71) est disposé du côté
admission de la culasse (14).
22. Moteur à quatre temps selon l'une des revendications 1 à 21 précédentes, caractérisé
en ce que l'arbre d'entrainement intermédiaire (67) est disposé décalé en direction
du côté du moteur qui est opposé à l'endroit auquel le tendeur de chaîne supérieur
(71) est disposé.
23. Moteur à quatre temps selon l'une des revendications 1 à 22 précédentes, caractérisé
en ce que le côté du bloc-cylindres (15) supportant la pompe à eau (5) est disposé
plus près d'un cylindre adjacent que le côté opposé du bloc-cylindres (15).
24. Moteur à quatre temps selon la revendication 19, caractérisé en ce que le tendeur
inférieur (72) est supporté par une partie du bloc-cylindres (15) qui est prévue,
de manière correspondante, du côté opposé du bloc-cylindres.