JP2018084215A - Oil supply structure of timing chain system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an oil supply structure of a timing chain system which can support an oil jet without depending on a structure of a timing chain periphery part and extending an entire length of an engine body.SOLUTION: A timing chain 30 is provided on a transmission attachment surface at one end side of an engine in an output shaft direction. The engine has: a first sprocket 11 provided at the one end side of an output shaft; a flywheel fastening plate 13 provided at the transmission side; and a timing chain cover 42 covering the transmission attachment surface. The oil jet 50 is disposed at a position overlapping with the flywheel fastening plate when viewed in the output shaft direction. One end part of the oil jet is held at an area of the transmission attachment surface located near the first sprocket 11. The other end part of the oil jet contacts with a pressing part 33a spaced away from the timing chain cover 42 in the output shaft direction to be supported thereby.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an oil supply structure for a timing chain system provided in an engine or the like.

  The following Patent Document 1 describes a configuration in which an oil jet is provided in the vicinity of the engagement portion between the crankshaft sprocket and the timing chain, and the end of the oil jet opposite to the cylinder block is supported by the timing chain cover. ing.

JP 2000-282829 A (FIG. 1) JP 2004-346895 A (FIG. 13)

  In the invention described in Patent Document 1, assuming a so-called rear chain system in which the timing chain system is provided on the transmission side, the transmission side of the sprocket on the output shaft of the engine and the cover surface of the chain cover A flywheel fastening plate is provided at the opposite position. In this case, since the plate support portion for rotatably supporting the flywheel fastening plate is disposed on the cover surface, the outer shape of the oil jet is extended and the timing chain cover as shown in Patent Document 1 is provided. It is impossible to support with.

  Further, in the invention described in Patent Document 2, when the pressing portion is extended from the timing chain cover side, the pressing portion must be formed from the radial outside of the plate support portion, and the shape of the pressing portion is complicated. In addition, there is a problem that the overall length of the engine body becomes long.

  The present invention solves the above-mentioned conventional problems and provides an oil supply structure for a timing chain system capable of supporting an oil jet without depending on the structure around the timing chain and the oil jet and without extending the overall length of the engine body. The purpose is to make it possible.

  In order to achieve the above object, the present invention is configured such that in the rear chain system, the end of the oil jet opposite to the cylinder block is pressed by a pressing portion disposed at a predetermined distance from the timing chain cover.

  Specifically, the present invention is directed to the oil supply structure of the timing chain system and has taken the following solutions.

  That is, the first invention is an oil supply structure of a timing chain system comprising a timing chain driven by an output shaft of an engine body and a cylindrical oil jet for supplying oil to the timing chain. The chain system is provided on a transmission mounting surface provided on one end side in the output shaft direction of the engine body, the engine body includes a first sprocket provided on one end side of the output shaft provided on the engine body, and an output A flywheel fastening plate provided on the transmission side of the first sprocket in the shaft, and a timing chain cover covering the transmission mounting surface, and the oil jet is a flywheel fastening plate when viewed from the output shaft direction. In addition to being arranged at the overlapping position, one end of the oil jet is The other end of the oil jet is in contact with and supported by a holding portion spaced from the timing chain cover in the output shaft direction while being fitted and held in a region near the first sprocket on the machine mounting surface. Has been.

  According to this, the oil jet is disposed at a position overlapping the flywheel fastening plate when viewed from the output shaft direction, and one end of the oil jet is located near the first sprocket on the transmission mounting surface of the engine body. While being fitted and held in the region, the other end portion of the oil jet is supported in contact with a pressing portion that is spaced from the timing chain cover in the output shaft direction. For this reason, the oil jet can be supported without depending on the structure around the timing chain and the oil jet and without extending the overall length of the engine body.

  In a second aspect based on the first aspect, the timing chain is provided with a chain guide for guiding the travel of the timing chain, and the end of the pressing portion on the chain guide side is located above the engine body. As seen, it may be located farther from the engine body than the other end of the holding part.

  According to this, since the end portion on the chain guide side of the pressing portion is located farther from the engine body than the other end portions, the pressing portion is on the opposite side of the engine body to the other end portion of the oil jet. Abutting in the direction. For this reason, since it becomes easy to produce the pressing force which acts on the axial direction of an oil jet, an oil jet can be supported appropriately.

  According to a third invention, in the first or second invention, a second sprocket coaxial with the first sprocket is provided between the first sprocket and the flywheel fastening plate, and the output shaft of the engine body is provided. In the direction, the other end of the oil jet may be located closer to the engine body than the second sprocket.

  According to this, the other end located outside the oil jet is located not on the second sprocket far from the engine body but on the first sprocket close to the engine body, and the length of the oil jet is shortened. Therefore, it is possible to ensure the durability of the oil jet pressed by the pressing portion and the engine body.

  In a fourth aspect based on the second aspect, the pressing portion is provided integrally with the chain guide, one end of the pressing portion is in contact with the other end portion of the oil jet, and the other end of the pressing portion is interposed via the chain guide. And a plate-like member held by the engine body.

  According to this, since the pressing member is a plate-like member that presses the other end of the oil jet from the side, the pressing portion acts as a spring. That is, the other end portion of the oil jet can be pressed with an appropriate force by utilizing the action of the leaf spring in the pressing portion. Further, since the pressing portion is provided integrally with the chain guide, additional parts constituting the pressing portion are not required, so that the work process at the time of assembling the engine does not increase.

  In a fifth aspect based on the fourth aspect, the chain guide has a bolt hole fastened to the engine body, and the bolt hole is provided near the other end of the oil jet in the chain guide. The pressing portion may be extended from a portion near the bolt hole.

  According to this, since the holding | suppressing part is a plate-shaped member, the effect | action of a leaf | plate spring can be obtained effectively.

  In a sixth aspect based on the fifth aspect, the pressing portion may have a width substantially equal to the width dimension of the other end portion of the oil jet.

  According to this, since the pressing portion can be formed in a compact manner, it becomes easy to bring the mounting position of the oil jet closer to the first sprocket having a small area surrounded by the timing chain.

  In a seventh aspect based on the first to sixth aspects, the oil jet may be disposed in the vicinity of the engagement position with the first sprocket.

  According to this, since the interval between the oil jet, the sprocket and the timing chain can be reduced, the oil pressure of the oil pump can be reduced, and as a result, the fuel consumption can be improved.

  According to the present invention, it is possible to realize an oil supply structure of a timing chain system capable of supporting an oil jet without depending on the structure around the timing chain and the oil jet and without extending the overall length of the engine body.

FIG. 1 is a side view (a timing chain cover is not shown) showing a transmission side of a vehicle engine provided with an oil supply structure for a timing chain system according to an embodiment of the present invention. FIG. 2 is a front view showing the timing chain cover of FIG. FIG. 3 is a perspective view showing a timing chain guide used in the timing chain system according to the embodiment of the present invention. FIG. 4 is a perspective view showing an oil jet used in a timing chain system according to an embodiment of the present invention. FIG. 5 is a partial perspective view showing a region including the timing chain guide of FIG. FIG. 6 is a cross-sectional view showing the cylinder axis direction along line VI-VI in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its application.

(One embodiment)
An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a side surface of a transmission engine side of a vehicle engine provided with an oil supply structure of a timing chain system. Here, illustration of a chain cover that covers a driving chain such as a timing chain is omitted.

  As shown in FIG. 1, the engine 1 is configured as, for example, a spark ignition type internal combustion engine. Although not shown, the engine 1 is mounted in a so-called horizontal position in the front engine room of the vehicle. However, the engine 1 may be installed vertically. There is no limit to the number of cylinders, but for example, in-line four cylinders. A crankshaft 10, which is an output shaft provided at the lower part of the cylinder block 2 of the engine 1, is connected to drive wheels via a transmission (not shown). A crankshaft sprocket 11 (see FIG. 6), which is a first sprocket for winding the timing chain 30, and an oil pump chain 31 are wound on the end of the crankshaft 10 from the engine 1 side. An oil pump chain sprocket 12 as a second sprocket, a flywheel (not shown) connected to a transmission or the like, and a flywheel fastening plate 13 fastened by a plurality of bolts are sequentially provided. Thus, in the present embodiment, a so-called rear chain system in which the timing chain 30 is provided on the transmission side is adopted.

  The cylinder head 3 connected to the upper side of the cylinder block 2 is provided with an intake cam shaft 14 and an exhaust cam shaft 15 that extend parallel to each other in the axial direction of the crankshaft 10. An intake cam sprocket 16 and an exhaust cam sprocket 17 are attached to the end of the intake camshaft 14 and the end of the exhaust camshaft 15, respectively. At least one of the cam sprockets 16 and 17 may be provided with a variable valve timing (VVT) mechanism.

  On the side of the cylinder block 2, there are a fuel pump drive shaft 18, a fuel pump sprocket 19 attached to the cylinder block 2 side of the fuel pump drive shaft 18, and a fuel pump sprocket 19 on the fuel pump drive shaft 18. A cam chain sprocket 20 attached to the outside is provided.

  The timing chain 30 is wound around the crankshaft sprocket 11 and the fuel pump sprocket 19. The cam chain 32 is wound around the air supply cam sprocket 16 and the exhaust cam sprocket 17 and the cam chain sprocket 20.

  An oil pump drive shaft 21 and an oil pump sprocket 22 provided on the oil pump drive shaft 21 are disposed below the lower cylinder block 4 connected to the lower side of the cylinder block 2.

  A timing chain guide 33 is attached to the cylinder block 2 to guide the travel of the tight side span between the crankshaft 10 and the fuel pump drive shaft 18 in the timing chain 30. At the end of the timing chain guide 33 in the vicinity of the bolt 43 on the crankshaft 10 side, a pressing portion 33a extending from the end to the vicinity of the engagement portion with the crankshaft sprocket 11 of the timing chain 30 is provided. Yes. An oil jet 50 that has an oil passage inside and that injects lubricating oil (oil) into the engagement portion between the timing chain 30 and the crankshaft sprocket 11 is provided on the back side (engine body side) of the pressing portion 33a. ing. The end of the oil jet 50 on the cylinder block 2 side is fitted into a hole (support hole) including an oil passage provided in the cylinder block 2. The pressing portion 33 a of the timing chain guide 33 is in contact with an end portion on the outside (opposite side of the cylinder block 2) of the oil jet 50 to support the oil jet 50. Therefore, the outer end of the oil jet 50 in the output shaft direction of the engine 1 does not contact the timing chain cover 42 (see FIG. 6). In addition, the detailed structure of the holding | suppressing part 33a provided in the timing chain guide 33 which concerns on this embodiment, and the oil jet 50 is mentioned later.

  A timing chain tensioner (hydraulic auto tensioner) that applies tension to the slack side of the timing chain 30 via a timing chain tensioner arm 34 in the slack side span between the crankshaft 10 and the fuel pump drive shaft 18 in the timing chain 30. ) 35 is held by the cylinder block 2.

  Similarly, in the cam chain 32, a cam chain guide 36 that guides the travel of the tight span between the fuel pump drive shaft 18 and the intake cam shaft 14 is held by the cylinder block 2. Further, a cam chain tensioner (which applies tension to the slack side of the cam chain 32 via a cam chain tensioner arm 37 is provided on the slack side span of the cam chain 32 between the fuel pump drive shaft 18 and the exhaust cam shaft 15. A hydraulic auto tensioner 38 is held by the cylinder block 2.

  In the oil pump chain 31, an oil pump chain guide 39 that guides the travel of the tight side span between the crankshaft 10 and the oil pump drive 21 is held by the lower cylinder block 4. Further, an oil pump chain tensioner 40 that applies tension to the loose side of the oil pump chain 31 is provided on the loose side span between the crankshaft 10 and the oil pump drive 21 in the oil pump chain 31. 4 is held.

  A timing chain cover 42 shown in FIG. 2 is usually provided on the side surface (transmission mounting surface) on the transmission side of the engine 1 having the timing chain system shown in FIG. 1 so as to cover the transmission mounting surface. . The timing chain cover 42 includes the chain guides 33, 36, 39, the chain tensioner arms 34, 37, 40, and the chain tensioners 35, 38 so as not to contact the chains 30, 31, 32. A plate support portion 42 a that rotatably supports the outer peripheral surface of the flywheel fastening plate 13 is provided on the inner wall surface of the opening portion of the timing chain cover 42 that exposes the flywheel fastening plate 13.

(Configuration of timing chain guide retainer and oil jet)
FIG. 3 shows the configuration of the timing chain guide according to the present embodiment, and FIG. 4 shows the configuration of the oil jet. FIG. 5 is an enlarged perspective view of a region including the timing chain guide 33 and the oil jet 50 shown in FIG. FIG. 6 shows a cross-sectional configuration taken along line VI-VI in FIG.

  As shown in FIGS. 1 and 3, the timing chain guide 33 has a separate sliding portion 33c for guiding the running of the chain. Further, the timing chain guide 33 has a plate-shaped pressing portion 33a formed integrally with the timing chain guide 33 and extending while being bent from the end on the crankshaft 10 side to the back surface side (cylinder block 2 side). doing. The pressing portion 33a comes into contact with the end surface of the oil jet 50 by the back surface (surface on the cylinder block 2 side) of the tip portion. As a result, the oil jet 50 can be prevented from falling off the cylinder block 2 due to the hydraulic pressure. The timing chain guide 33 is attached to the cylinder block 2 of the engine 1 by two bolts 43.

  As shown in FIG. 4, the oil jet 50 has a bottomed cylindrical shape, for example, and a first end 50 b provided with an opening 50 a communicating with an internal oil passage provided in the cylinder block 2, The second end portion 50c is supported on the side opposite to the first end portion 50b and supported by the pressing portion 33a of the timing chain guide 33. An oil injection port 50d is provided on the lower surface in the vicinity of the second end 50c of the oil jet 50, that is, the side surface on the lower cylinder block 4 side, and oil 55 is injected from the oil injection port 50d. Further, at the intermediate portion on the side surface of the oil jet 50, for example, a non-rotation holding portion 50f that extends in the opening direction of the oil injection port 50d and holds the anti-rotation projection 50e is provided. The anti-rotation protrusion 50 e is a protrusion that prevents the rotation of the cylindrical oil jet 50 and positions it, and is fitted into the hole of the cylinder block 2.

  FIG. 5 is a perspective view in which a region including the timing chain guide 33 in FIG. 1 is partially enlarged. FIG. 6 is a cross-sectional view showing the downward direction of the cylinder axis along the line VI-VI in FIG. As shown in FIGS. 5 and 6, the oil jet 50 according to the present embodiment is disposed on the upper side of the engagement portion of the timing chain 30 with the crankshaft sprocket 11. Accordingly, the oil injection port 50 d of the oil jet 50 is directed to the portion where the timing chain 30 is engaged with the crankshaft sprocket 11. Further, as described above, the pressing portion 33a of the timing chain guide 33 is in contact with the second end portion 50c, which is the end portion of the oil jet 50 opposite to the cylinder block 2, to support the oil jet 50. . In FIG. 5, the illustration of the flywheel fastening plate 13 provided on the crankshaft 10 is omitted.

  On the other hand, FIG. 6 illustrates the flywheel fastening plate 13 and the timing chain cover 42. As shown in FIG. 6, the pressing portion 33 a for the oil jet 50 provided in the timing chain guide 33 is viewed from the base of the pressing portion 33 a (the main body portion of the timing chain guide 33) when viewed from the cylinder axial direction. Compared to the tip of the portion 33a, the cylinder block 2 is displaced to the outside (opposite to the engine 1). In this way, the pressing portion 33a comes into contact with the second end portion of the oil jet at an angle by an amount shifted outward. As a result, a pressing force (biasing force) acting in the major axis direction of the oil jet 50 is likely to be generated, so that the oil jet 50 can be appropriately supported. Furthermore, since the pressing portion 33a has a plate shape that presses the second end 50c of the oil jet from the side, the pressing portion 33a acts as a leaf spring. As a result, the second end 50c of the oil jet 50 can be pressed with an appropriate force. That is, when oil pressure is applied to the inside of the oil jet 50 and a force is generated to pull it in the direction of the pressing portion 33a, or the length of the oil jet 50 is formed longer than the nominal length due to manufacturing variations. In this case, the reaction force acting on the oil jet 50 can be suppressed by the leaf spring action.

  Further, as shown in FIGS. 3 and 6, the pressing portion 33 a is formed so as to extend from a portion in the vicinity of the bolt 43, so that the above-described action of the leaf spring can be effectively obtained. Specifically, by adopting such a configuration, a portion that substantially acts as a leaf spring can be formed short, so that the bolt axial force can be efficiently transmitted to the second end portion 50c. In addition to the effect of the action, the oil jet 50 can be supported with an appropriate force.

  Further, the pressing portion 33 a is provided with a width substantially equal to the width dimension of the second end portion 50 c of the oil jet 50. For this reason, this press part 33a can be formed compactly. As a result, even if the region surrounded by the timing chain 30 and the crankshaft sprocket 11 is narrow, the pressing portion 33a can be disposed avoiding the region where the timing chain 30 flutters. The top of the bolt 43 of the timing chain guide 33 according to this embodiment does not contact the timing chain cover 42.

  In the present embodiment, the crankshaft 10 is provided with a crankshaft sprocket 11 that is a first sprocket and an oil pump chain sprocket 12 that is a second sprocket outside the crankshaft 10 from the engine 1 side. Since the oil jet 50 according to this embodiment is disposed in the vicinity of the biting position of the crankshaft sprocket 11 on the inner side (engine 1 side), the oil jet 50, the crankshaft sprocket 11 and the timing chain 30 The interval can be reduced. As a result, the oil pressure of the oil pump can be lowered.

  Further, as shown in FIG. 6, in the case of the rear chain system as in this embodiment, when the oil jet 50 is brought closer to the biting position with the crankshaft sprocket 11, the diameter of the crankshaft sprocket 11 is increased. Since it is smaller than the diameter of the flywheel fastening plate 13, the oil jet 50 is hidden behind the flywheel fastening plate 13. However, in this embodiment, since the pressing portion 33a that supports the oil jet 50 is provided not in the timing chain cover 42 but in the timing chain guide 33, the flywheel fastening plate 13 becomes an obstacle to the pressing portion 33a. Therefore, the total length of the engine 1 does not increase.

  As described above, according to the present embodiment, while suppressing generation of radiated sound from the timing chain cover 42 caused by the oil jet 50, a boss hole dedicated to the cylinder block 2 is used without using bolts or the like. The oil supply structure of the timing chain 30 that can fix the oil jet 50 can be obtained without providing any oil.

  The oil supply structure of the timing chain system according to the present invention is useful as an oil supply structure that can easily support the oil jet without depending on the structure around the timing chain and the oil jet and without extending the overall length of the engine body. It is.

1 Engine (Engine body)
2 Cylinder block 3 Cylinder head 10 Crankshaft 11 Crankshaft sprocket (first sprocket)
12 Chain sprocket for oil pump (second sprocket)
13 Flywheel fastening plate 18 Fuel pump drive shaft 19 Fuel pump sprocket 20 Cam chain sprocket 21 Oil pump drive shaft 22 Oil pump sprocket 30 Timing chain 31 Oil pump chain 32 Cam chain 33 Timing chain guide 33a Holding part 33A Timing chain Guide 33b Holding part 33c Sliding part 34 Timing chain tensioner arm 35 Timing chain tensioner 42 Timing chain cover 42a Plate support part 43 Bolt 50 Oil jet 50a Opening part 50b First end part (one end part)
50c second end (other end)
50d Oil injection port 50e Anti-rotation protrusion 50f Anti-rotation holding part

That is, the first invention is an oil supply structure of a timing chain system comprising a timing chain driven by an output shaft of an engine body and a cylindrical oil jet for supplying oil to the timing chain. The chain system is provided on a transmission mounting surface provided on one end side in the output shaft direction of the engine body, the engine body includes a first sprocket provided on one end side of the output shaft provided on the engine body, and an output A flywheel fastening plate provided on the transmission side of the first sprocket in the shaft, and a timing chain cover covering the transmission mounting surface, and the oil jet is a flywheel fastening plate when viewed from the output shaft direction. In addition to being arranged at the overlapping position, one end of the oil jet is The other end of the oil jet is in contact with and supported by a holding portion spaced from the timing chain cover in the output shaft direction while being fitted and held in a region near the first sprocket on the machine mounting surface. The timing chain is provided with a chain guide that guides the travel of the timing chain, and the end portion on the chain guide side of the pressing portion is more than the other end portion of the pressing portion when viewed from above the engine body. Is also located away from the engine body, the holding part is provided integrally with the chain guide, one end of the holding part contacts the other end of the oil jet, and the other end of the holding part is connected to the engine via the chain guide. Ru plate members der held by the body.

According to this, the oil jet is disposed at a position overlapping the flywheel fastening plate when viewed from the output shaft direction, and one end of the oil jet is located near the first sprocket on the transmission mounting surface of the engine body. While being fitted and held in the region, the other end portion of the oil jet is supported in contact with a pressing portion that is spaced from the timing chain cover in the output shaft direction. For this reason, the oil jet can be supported without depending on the structure around the timing chain and the oil jet and without extending the overall length of the engine body.
In addition, since the end on the chain guide side of the presser part is located farther from the engine body than the other end part, the presser part is displaced in the direction opposite to the engine main body with respect to the other end part of the oil jet. Abut. For this reason, since it becomes easy to produce the pressing force which acts on the axial direction of an oil jet, an oil jet can be supported appropriately.
Further, since the pressing portion is a plate-like member that presses the other end of the oil jet from the side, the pressing portion acts as a spring. That is, the other end portion of the oil jet can be pressed with an appropriate force by utilizing the action of the leaf spring in the pressing portion. Further, since the pressing portion is provided integrally with the chain guide, additional parts constituting the pressing portion are not required, so that the work process at the time of assembling the engine does not increase.

In a second aspect based on the first invention, between the first sprocket and the flywheel fastening plate, a second sprocket of the first sprocket coaxially is provided in the output shaft direction of the engine body, The other end of the oil jet may be located closer to the engine body than the second sprocket.

In a third aspect based on the first aspect , the chain guide has a bolt hole fastened to the engine body, and the bolt hole is provided in the vicinity of the other end of the oil jet in the chain guide. The pressing portion may be extended from a portion near the bolt hole.

In a fourth aspect based on the third aspect , the pressing portion may have a width substantially equal to the width dimension of the other end portion of the oil jet.

In a fifth aspect based on the first to fourth aspects, the oil jet may be disposed in the vicinity of the engagement position with the first sprocket.

Claims (7)

An oil supply structure of a timing chain system comprising a timing chain driven by an output shaft of an engine body and a cylindrical oil jet for supplying oil to the timing chain,
The timing chain system is provided on a transmission mounting surface provided on one end side in the output shaft direction of the engine body,
The engine body includes a first sprocket provided on the one end side of an output shaft provided in the engine body, a flywheel fastening plate provided on the transmission side of the output shaft from the first sprocket, A timing chain cover covering the transmission mounting surface;
The oil jet is disposed at a position overlapping the flywheel fastening plate when viewed from the output shaft direction, and one end of the oil jet is in the vicinity of the first sprocket on the transmission mounting surface of the engine body. A timing chain system in which the other end of the oil jet is held in contact with and supported by a pressing portion provided at an interval in the output shaft direction from the timing chain cover. Oil supply structure. In the oil supply structure of the timing chain system according to claim 1,
The timing chain is provided with a chain guide for guiding the travel of the timing chain,
An oil supply structure for a timing chain system, wherein the end portion on the chain guide side of the pressing portion is located farther from the engine body than the other end portion of the pressing portion when viewed from above the engine body. In the oil supply structure of the timing chain system according to claim 1 or 2,
A second sprocket coaxial with the first sprocket is provided between the first sprocket and the flywheel fastening plate,
An oil supply structure for a timing chain system, wherein the other end of the oil jet is positioned closer to the engine body than the second sprocket in the output shaft direction of the engine body. In the oil supply structure of the timing chain system according to claim 2,
The pressing portion is provided integrally with the chain guide,
An oil supply structure for a timing chain system, wherein one end of the pressing portion is in contact with the other end portion of the oil jet, and the other end of the pressing portion is a plate-like member held by the engine body via the chain guide. In the oil supply structure of the timing chain system according to claim 4,
The chain guide has a bolt hole fastened to the engine body,
The bolt hole is provided in the vicinity of the other end of the oil jet in the chain guide,
The holding part is an oil supply structure of a timing chain system that extends from a portion in the vicinity of the bolt hole. In the oil supply structure of the timing chain system according to claim 5,
An oil supply structure for a timing chain system, wherein the pressing portion has a width substantially equal to a width dimension of the other end portion of the oil jet. In the oil supply structure of the timing chain system according to any one of claims 1 to 6,
The oil supply structure for a timing chain system, wherein the oil jet is disposed in the vicinity of a biting position with the first sprocket.

Images