Chain guide

Abstract

The present invention provides a chain guide that can improve the functionality of a chain drive system. Specifically, the chain guide (100) of the present invention is a chain guide that is mounted on an engine unit (150) by a mounting screw (140) and slidably guides a moving chain, and is configured to include a mounting portion (120) provided with a shaft hole (121) through which the mounting screw (140) passes, and an oil injection passage (130) that injects lubricating oil supplied to the shaft hole (121) at a predetermined pressure toward the chain.

Description

Technical Field

[0001] The present invention relates, for example, to a chain guide that is provided in a chain drive system incorporated in a timing system for an automotive engine and guides a moving chain. Background Art

[0002] Conventionally, in order to stabilize a chain moving between sprockets and appropriately maintain tension, there has generally been used a chain guide having a guide surface that slidably guides the moving chain and a main body portion that supports the guide surface along the moving direction of the chain.

[0003] For example, as Figure 19 shown, there is known a chain drive system in which a chain CH is looped around a drive sprocket S1 of a crankshaft installed in an engine compartment and a pair of driven sprockets S2 of a camshaft without joints, and the chain CH is guided by a chain guide.

[0004] In this known chain drive system, on the outside of a portion on the slack side of the chain CH, there is disposed a chain guide (movable guide) SG having a sliding function that slidably contacts the circulating chain CH, is linked to a tensioning device T to impart appropriate tension, and can prevent vibration and lateral runout of the moving chain. Further, on a portion that is the tension side of the chain CH, there is disposed a chain guide (fixed guide) FG for preventing vibration when the chain moves.

[0005] The movable guide SG is swingably mounted about a swing shaft B0 within the plane in which the chain CH is looped, and is urged toward the chain CH by the tensioning device T. The fixed guide G is fixed by two mounting shafts B1.

[0006] Since lubrication of the chain in the chain drive system is not performed by directly supplying oil to the chain, the lubrication characteristics of the chain may deteriorate. Therefore, there has been proposed a configuration in which oil is directly supplied to the chain from a chain guide, which is a functional part that only restricts the path of the chain in the chain drive system (for example, see Patent Document 1).

[0007] The chain guide described in Patent Document 1 is a chain guide that lubricates the entire contact surface between the chain and the guide block by oil supplied to an oil supply groove in the guide block moving in the longitudinal direction of the guide block from a hydraulic tensioning device via an oil passage. In this chain guide, on the surface of the guide block that contacts the chain, an oil supply groove is provided in the longitudinal direction. Further, on the back surface of the guide block, an oil passage is formed that is integrally formed with the chain guide body and directly connects an oil passage formed in a piston of the hydraulic tensioning device to the oil supply groove in the guide block.

[0008] Patent Document

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-329092 Summary of the Invention

[0010] However, even for the chain guide described in the above Patent Document 1, it is difficult to improve the functionality required for a chain drive system such as the wear resistance of the chain, the wear resistance of the chain moving surface, the frictional properties of the timing system, and the noise performance (low noise). In addition, in practice, it is difficult to further improve the wear resistance of the mounting portion through which the rocking shaft passes and the sliding properties of the rocking shaft and the mounting portion on the movable guide.

[0011] The present invention has been made based on the above circumstances, and the technical problem to be solved is to provide a chain guide that can improve the functionality of a chain drive system.

[0012] The chain guide of the present invention is mounted on the engine unit by a mounting screw and slidably guides a moving chain. It solves the above problem by the following configuration: it has a mounting portion provided with a shaft hole through which the mounting screw passes, and has an oil injection passage for injecting lubricating oil supplied to the shaft hole at a specified pressure toward the chain. On the mounting surface facing the engine unit, it has an oil introduction passage that connects the oil supply port of the engine unit to the shaft hole. The chain guide is configured to be swingable about the mounting screw as a rocking shaft. The oil introduction passage has an oil introduction groove portion at a position facing the oil supply port of the engine unit, and the oil introduction groove portion is formed so as to extend along an arc centered on the rocking shaft.

[0013] According to the chain guide according to Technical Solution 1, by injecting lubricating oil onto the chain and directly supplying lubricating oil to the chain, the lubrication efficiency can be improved, and further, the functionality of the chain drive system can be improved.

[0014] That is, while improving the wear resistance of the chain, chain elongation can be suppressed. In addition, while significantly reducing the sliding resistance between the chain and the chain moving surface, an increase in the sliding resistance over time can be suppressed, and further, wear of the chain moving surface can be reduced. In addition, since the chain can smoothly slide and contact the chain guide, frictional losses can be reduced, the fuel consumption performance of the engine can be improved, and frictional noise generated by the sliding contact can be reduced, improving the noise performance of the chain drive system.

[0015] In addition, in the case of a movable guide, high slidability of the mounting screw relative to the mounting portion can be obtained, thereby improving wear resistance. The movable guide is configured to be swingable about the mounting screw as a rocking shaft so as to impart an appropriate tension to the chain while being linked with a tensioning device.

[0016] Moreover, since the oil injection passage is formed to point from the mounting portion to the chain, the oil injection passage can be formed with the shortest length, so that the required amount of oil can be reduced while stably supplying lubricating oil to the chain.

[0017] In addition, the lubricating oil supplied from the engine unit can be reliably guided to the shaft hole on the mounting portion.

[0018] In addition, even when it is configured as a movable guide, the lubricating oil can be reliably guided to the shaft hole on the mounting portion.

[0019] According to the configuration described in Technical Solution 2, it is only necessary to set the oil supply port in the screw mounting hole on the engine unit side, thereby reducing the processing burden on the engine unit side.

[0020] According to the configuration described in Technical Solution 3, when the oil flow outlet on the mounting screw is located at any position in the circumferential direction, the lubricating oil supplied to the mounting portion can be stably introduced into the oil injection hole. Description of the Drawings

[0021] Figure 1 It is a perspective view showing a configuration example of the chain guide according to Embodiment 1 together with the mounting screw.

[0022] Figure 2 It is Figure 1 The top view of the chain guide shown as viewed from the mounting surface side opposite to the engine unit.

[0023] Figure 3 It shows Figure 1 An enlarged perspective view showing the configuration of the mounting portion on the chain guide shown.

[0024] Figure 4 It is a schematic view showing the cross-section when the chain guide shown is cut by a plane perpendicular to the rocking shaft at the position where the oil injection hole is formed. Figure 1 The cross-sectional view when the chain guide shown is cut.

[0025] Figure 5 It is Figure 2 The combined cross-sectional view of the A-B-C line, showing the state where the chain guide shown is mounted on the engine unit. Figure 1 The chain guide shown is mounted on the engine unit.

[0026] Figure 6 It is a perspective view showing a configuration example of the chain guide according to Embodiment 2.

[0027] Figure 7 It is Figure 6 The top view of the chain guide shown as viewed from the mounting surface side opposite to the engine unit.

[0028] Figure 8 It showsFigure 6 An enlarged perspective view of the structure of the mounting portion on the chain guide shown.

[0029] Figure 9 It schematically shows that at the position where the fuel injection holes are formed, a plane perpendicular to the rocking shaft Figure 6 A view of the cross-section when the chain guide shown is cut.

[0030] Figure 10 It is Figure 7 A combined sectional view taken along line D - E - F of Figure 6 Showing the state where the chain guide shown is mounted on the engine unit.

[0031] Figure 11 A perspective view showing a structural example of the chain guide according to Embodiment 3.

[0032] Figure 12 It is Figure 11 A top view of the chain guide shown as viewed from the mounting surface side facing the engine unit.

[0033] Figure 13 It is Figure 12 A combined sectional view taken along line G - H - I of Figure 11 Showing the state where the chain guide shown is mounted on the engine unit.

[0034] Figure 14 A perspective view showing the structural example of the chain guide according to Embodiment 4 together with the mounting screws.

[0035] Figure 15 It is Figure 14 A top view of the chain guide shown as viewed from the mounting surface side facing the engine unit.

[0036] Figure 16 It shows Figure 14 An enlarged perspective view of the structure of the mounting portion on the chain guide shown.

[0037] Figure 17 A single - side sectional view along the axial direction showing the structural example of the mounting screws for mounting the chain guide according to Embodiment 4 on the engine unit.

[0038] Figure 18 It is Figure 15 A sectional view taken along line J - J of Figure 14 Showing the state where the chain guide shown is mounted on the engine unit.

[0039] Figure 19 An explanatory view schematically showing the structure of the timing system of an existing engine.

[0040] Symbol Explanation

[0041] 100, 200, 300, 400-chain guide; 110-guide block; 111-chain moving surface (sliding surface); 112-guide portion; 115, 215, 315, 415-base component; 116, 216, 316-mounting surface; 120, 220, 320, 420-mounting portion; 121, 221, 321, 421-axial hole; 125, 225, 325-oil introduction path; 126, 226, 326-groove; 127, 227, 327-oil introduction groove; 128, 228, 328, 428-tensioning device abutment portion; 130, 230, 330, 430-oil injection passage; 131, 231, 431-oil injection hole; 132, 232, 332, 432-oil inlet; 133, 233, 333, 433-oil outlet; 335-injection groove; 436-peripheral groove; 140, 440-mounting screws; 141, 441-head; 142, 442-flange; 143, 443-shaft; 144, 444-threaded portion; 445-oil passage; 446-oil inlet; 447-oil outlet; 448-peripheral groove; 150-engine block; 151-chain guide mounting surface; 152-screw mounting hole; 155-oil supply passage; 156-oil supply port; B0-swinging shaft; B1-mounting shaft; CH-chain; FG-fixed guide; SG-movable guide; S1-driving sprocket; S2-driven sprocket; T-tensioning device. DETAILED DESCRIPTION

[0042] The present invention is a chain guide which is mounted on an engine unit by a mounting screw and which slides to guide a moving chain. The specific implementation form may be any as long as it is of the following structure, that is, it has a mounting portion provided with an axial hole through which the mounting screw passes, and has an oil injection passage for injecting lubricating oil supplied to the axial hole at a specified pressure toward the chain.

[0043] The chain guide of the present invention can be configured as a fixed guide fixed to the engine unit to guide the chain in a sliding manner, or as a movable guide (tensioning rod) supported by a swingable shaft in the engine compartment to apply appropriate tension to the chain while working in conjunction with a hydraulic tensioner.

[0044] The chain moving surface (sliding surface) of the chain guide may be formed integrally with the chain guide using a material having good sliding properties, or a guide block having good sliding properties with the chain may be detachably provided.

[0045] As a specific raw material of the chain guide of the present invention, any material can be used as long as the frictional resistance with the chain is small. In particular, a raw material that can exhibit durability in a high-temperature environment and achieve smooth sliding contact movement of the chain is preferably used. Examples of such raw materials include synthetic resin materials such as polyamide 6 resin, polyamide 46 resin, polyamide 66 resin, and polyacetal resin.

[0046] Example 1

[0047] As Figures 1 to 4 shown, the chain guide 100 according to the first embodiment of the present invention is configured to be swingably mounted on an engine unit (not shown) with a mounting screw 140 as a swing axis, and is a movable guide that imparts appropriate tension to the chain while being linked with an oil pressure type tensioning device (not shown).

[0048] The chain guide 100 includes a guide block 110 that slidably guides the moving chain and a base member 115 that supports the guide block 110 along the length direction of the guide (chain moving direction). The guide block 110 and the base member 115 are formed of a synthetic resin material or the like.

[0049] The guide block 110 has a chain moving surface (sliding surface) 111 that extends in the length direction of the guide, and guide portions 112 that protrude upward are perpendicularly provided at both end edges in the width direction of the guide of the chain moving surface 111.

[0050] The base member 115 is bent and formed along the length direction of the guide, has a mounting portion 120 for mounting to the engine unit near one end in the length direction of the guide, and a tensioning device abutting portion 128 that abuts against the oil pressure tensioning device near the other end.

[0051] On the mounting portion 120, a shaft hole 121 is provided that forms a cylindrical space for passing through the mounting screw 140.

[0052] The mounting screw 140 for mounting the chain guide 100 to the engine unit is a flange screw, which is composed of a head 141, a disc-shaped flange portion 142 connected to the head 141, a cylindrical shaft portion 143 extending from the flange portion 142, and a threaded portion 144 having a step formed on the shaft portion 143.

[0053] The chain guide 100 according to the present embodiment has an oil introduction path 125 provided on the mounting surface 116 facing the engine unit, which connects the oil supply port of the engine unit and the shaft hole 121 on the mounting portion 120; and an oil injection passage 130 that injects the lubricating oil supplied to the shaft hole 121 from the engine through the oil introduction path 125 at a specified pressure toward the chain.

[0054] The oil introduction passage 125 is constituted by a groove 126 which is formed so as to extend linearly from the opening edge of the shaft hole 121 toward the radially outer side, and has an oil introduction groove portion 127 at an end position facing the oil supply port of the engine unit. The oil introduction groove portion 127 is formed so as to extend along an arc centered on the rocking shaft.

[0055] The fuel injection passage 130 is constituted by an injection hole 131 which extends linearly such that the oil introduction port 132 opens on the inner surface of the shaft hole 121 and the oil discharge port 133 opens on the chain moving surface 111.

[0056] The injection hole 131 is inclined in a direction pointing upstream in the chain moving direction, whereby the chain can be lubricated reliably.

[0057] In the present embodiment, the oil introduction port 132 is formed at the central position in the axial direction of the shaft hole 121 and at the circumferential position within the width region of the oil introduction passage 125 in the circumferential direction of the shaft hole 121. Further, the oil discharge port 133 is formed at the central position in the guide member width direction at one end side in the guide member length direction on the chain moving surface 111. In addition, as long as the injection hole 131 is formed as described above, the formation positions of the oil introduction port 132 and the oil discharge port 133 are not particularly limited, but it is preferable to form the length of the fuel injection passage 130 to be the shortest dimension.

[0058] As Figure 5 shown, in the chain guide member 100 of the present embodiment, engine oil is supplied as lubricating oil to the oil introduction passage 125 from the oil supply passage 155 at a prescribed supply pressure. The oil supply passage 155 has an oil supply port 156 opened on the chain guide member mounting surface 151 of the engine unit 150. At this moment, since the oil introduction groove portion 127 is provided at the end position of the oil introduction passage 125 facing the oil supply port 156 of the engine unit 150, even if the chain guide member 100 rocks in order to adjust the tension of the moving chain, the lubricating oil can be reliably supplied to the oil introduction passage 125 from the oil introduction groove portion 127.

[0059] The lubricating oil introduced into the oil introduction passage 125 flows between the inner periphery of the shaft hole 121 on the mounting portion 120 and the outer periphery of the shaft portion 143 of the mounting screw 140, and lubricates the sliding portion of the mounting screw 140 as the rocking shaft and the shaft hole 121. Then, the lubricating oil in the shaft hole 121 flows into the injection hole 131 from the oil introduction port 132. The lubricating oil flowing into the injection hole 131 is ejected from the oil discharge port 133 opened on the chain moving surface 111 toward the moving chain, lubricating the chain directly and also lubricating the chain moving surface 111.

[0060] Example 2

[0061] Except for the difference in the configuration of the passage for oil injection, the chain guide according to the second embodiment of the present invention has substantially the same configuration as the chain guide 100 according to the aforementioned first embodiment. The chain guide according to the present embodiment is configured to be swingably mounted on the engine unit by mounting screws, and is a movable guide that imparts appropriate tension to the chain while being linked with the hydraulic tensioning device. As Figures 6 to 9 shown, the chain guide 200 includes a guide block 110 that slidably guides the moving chain, and a base member 215 that supports the guide block 110 along the length direction of the guide (the chain moving direction).

[0062] The base member 215 is bent along the length direction of the guide, and has a mounting portion 220 for mounting to the engine unit near one end in the length direction of the guide, and a tensioning device abutting portion 228 that abuts against the hydraulic tensioning device near the other end. On the mounting portion 220, a shaft hole 221 is provided that forms a cylindrical space for passing through the mounting screw.

[0063] In addition, on the mounting surface 216 facing the engine unit, there is an oil introduction passage 225 composed of a groove 226 and an oil introduction groove portion 227. The groove 226 is formed to extend linearly from the opening edge of the shaft hole 221 toward the radially outer side, and the oil introduction groove portion 227 is formed to extend along an arc centered on the rocking shaft.

[0064] Then, as Figure 9 shown, the oil injection passage 230 on the chain guide 200 according to the second embodiment is composed of an oil injection hole 231. The oil injection hole 231 extends linearly such that an oil introduction port 232 opens on the inner surface of the shaft hole 221 in the mounting portion 220 and an oil discharge port 233 opens on the end surface on one end side in the length direction of the base member 215. The oil injection hole 231 is inclined to point toward the upstream side in the chain moving direction. Similar to the chain guide 100 according to the first embodiment, as long as the oil injection hole 231 is formed as described above, the formation positions of the oil introduction port 232 and the oil discharge port 233 are not particularly limited, but it is preferable to form the length of the oil injection passage 230 to be the shortest dimension.

[0065] As Figure 10As shown, on the chain guide 200 of the present embodiment, engine oil is supplied as lubricating oil from the oil supply passage 155 to the oil introduction passage 225 at a specified supply pressure. The oil supply passage 155 has an oil supply port 156 that opens on the chain guide mounting surface 151 of the engine unit 150. The lubricating oil introduced into the oil introduction passage 225 flows between the inner circumference of the shaft hole 221 on the mounting portion 220 and the outer circumference of the shaft portion 143 of the mounting screw 140, lubricating the sliding portion between the mounting screw 140, which is a rocking shaft, and the shaft hole 221. Moreover, the lubricating oil in the shaft hole 221 flows into the injection hole 231 from the oil guide port 232. The lubricating oil flowing into the injection hole 231 is ejected toward the moving chain from the oil discharge port 233 that opens on the end surface on one end side in the guide member length direction of the base member 215, directly lubricating the chain. In addition, since the chain supplied with lubricating oil is in sliding contact with the chain moving surface 111, the chain moving surface 111 can be lubricated.

[0066] Example 3

[0067] Except for the difference in the configuration of the injection passage, the chain guide according to the third embodiment of the present invention has substantially the same configuration as the chain guide 100 according to the foregoing first embodiment. The chain guide according to the present embodiment is configured to be swingably mounted on the engine unit by a mounting screw and to be a movable guide that imparts appropriate tension to the chain while being linked with the hydraulic tensioner. As Figure 11 and Figure 12 shown, the chain guide 300 includes a guide block 110 that slidably guides the moving chain and a base member 315 that supports the guide block 110 along the guide member length direction (chain moving direction).

[0068] The base member 315 is bent and formed along the guide member length direction, has a mounting portion 320 for mounting to the engine unit near one end in the guide member length direction, and has a tensioner contact portion 328 that contacts the hydraulic tensioner near the other end. On the mounting portion 320, a shaft hole 321 is provided that forms a cylindrical space for passing through the mounting screw.

[0069] In addition, on the mounting surface 316 facing the engine unit, there is an oil introduction passage 325 formed by a groove 326 and an oil introduction groove portion 327. The groove 326 is formed to extend linearly from the opening edge of the shaft hole 321 toward the radially outer side, and the oil introduction groove portion 327 is formed to extend along an arc centered on the rocking shaft.

[0070] Thus, the chain guide 300 according to the third embodiment has an oil injection groove 335 which is provided on the mounting surface 316 opposite to the engine unit on the base member 315 and extends linearly from the opening edge of the shaft hole 321 toward one end side in the guide length direction of the base member 315 in a groove shape. Further, by mounting the chain guide 300 on the engine unit, the oil injection groove 335 is closed by the wall of the engine unit, and an oil injection passage 330 (see Figure 13 ) can be formed. The oil injection passage 330 has an oil introduction port 332 opening on the inner surface of the shaft hole 321 and an oil discharge port 333 opening on the end surface of one end side of the base member 315 in the guide length direction. The oil injection groove 335 is inclined in a direction pointing upstream of the chain movement direction. Similar to the chain guide 100 according to the first embodiment, as long as the oil injection passage 330 is formed as described above, the formation positions of the oil introduction port 332 and the oil discharge port 333 are not particularly limited, but it is preferable to form the length of the oil injection passage 330 to be the shortest dimension.

[0071] As Figure 13 shown, in the chain guide 300 of the present embodiment, engine oil is supplied as lubricating oil from the oil supply passage 155 to the oil introduction passage 325 at a predetermined supply pressure, and the oil supply passage 155 has an oil supply port 156 opening on the chain guide mounting surface 151 of the engine unit 150. The lubricating oil introduced into the oil introduction passage 325 flows between the inner periphery of the shaft hole 321 on the mounting portion 320 and the outer periphery of the shaft portion 143 of the mounting screw 140 to lubricate the sliding portion of the mounting screw 140 as a rocking shaft and the shaft hole 321, and further flows into the oil injection passage 330 formed by the oil injection groove 335 and the engine unit 150. The lubricating oil flowing into the oil injection passage 330 is sprayed from the oil discharge port 333 opening on the end surface of one end side of the base member 315 in the guide length direction toward the moving chain to directly lubricate the chain. Further, since the chain supplied with lubricating oil is in sliding contact with the chain movement surface, the chain movement surface 111 can be lubricated.

[0072] Example 4

[0073] The chain guide according to the fourth embodiment of the present invention has a substantially same configuration as the chain guide 100 according to the first embodiment described above, except that the oil supply structure for the shaft hole is different. The chain guide according to the present embodiment is configured to be swingably mounted on an engine unit (not shown) by a mounting screw and to be a movable guide that imparts an appropriate tension to the chain while being linked with a hydraulic tensioner (not shown). As Figures 14 to 16 shown, the chain guide 400 includes a guide block 110 that slidably guides the moving chain and a base member 415 that supports the guide block 110 along the guide length direction (chain movement direction).

[0074] The base member 415 is bent along the length direction of the guide member, and has a mounting portion 420 for mounting to the engine group near one end in the length direction of the guide member, and a tension device abutting portion 428 for abutting against the oil pressure tension device near the other end. On the mounting portion 420, a shaft hole 421 is provided with a cylindrical space formed therein for passing through the mounting screw 440.

[0075] The oil injection passage 430 of the chain guide 400 according to the present embodiment is composed of an oil injection hole 431 (see Figure 18 ), and the oil injection hole 431 extends linearly such that an oil introduction port 432 opens on the inner surface of the shaft hole 421 and an oil discharge port 433 opens on the chain moving surface 111. The formation positions of the oil introduction port 432 and the oil discharge port 433 are the same positions as those of the chain guide 100 according to the first embodiment, and the oil injection hole 431 is inclined in a pointing state toward the upstream side in the chain moving direction.

[0076] On the inner surface of the shaft hole 421 of the mounting portion 420, at the position where the oil introduction port 432 of the oil injection hole 431 opens, a circumferential groove 436 is formed, so that it can be configured that when the oil flow outlet provided on the mounting screw 440 described later is located at any position in the circumferential direction, the lubricating oil supplied to the shaft hole 421 can be guided to the oil injection hole 431, and the lubricating oil can be stably introduced into the oil injection hole 431.

[0077] Thus, in the chain guide 400 according to the fourth embodiment, the oil supply structure is formed such that the oil from the engine is supplied to the shaft hole 421 provided on the mounting portion 420 of the base member 415 through the oil passage provided on the mounting screw 440.

[0078] The mounting screw 440 for mounting the chain guide 400 according to the present embodiment to the engine group is a flange screw, and as Figure 17 shown, it is composed of a head 441, a disc-shaped flange portion 442 connected to the head 441, a cylindrical shaft portion 443 extending from the flange portion 442, and a threaded portion 444 having a step formed on the shaft portion 443.

[0079] The mounting screw 440 has an oil passage 445 formed such that an oil inlet 446 opens at the axial top end of the mounting screw 440 and an oil outlet 447 opens on the side surface of the shaft portion 443.

[0080] In a state where the mounting screw 440 is passed through the shaft hole 421 of the chain guide 400, the oil outlet 447 is formed at an axial position opposed to the position where the oil introduction port 432 of the oil injection hole 431 opens.

[0081] In addition, on the side surface of the shaft portion 443, at the position where the oil flow outlet 447 opens, a circumferential groove 448 is formed, so that it can be configured that, when the oil flow outlet 447 is at any position in the circumferential direction, the lubricating oil supplied to the shaft hole 421 can be guided to the oil injection hole 431, and the lubricating oil can be stably introduced into the oil injection hole 431.

[0082] Although in the present embodiment, the circumferential grooves 436 and 448 are formed on the inner surface of the shaft hole 421 and the side surface of the mounting screw 440 on the chain guide 400, the circumferential groove may be formed on at least one of the inner surface of the shaft hole 421 and the side surface of the mounting screw 440 on the chain guide 400.

[0083] As Figure 18 shown, on the chain guide 400 of the present embodiment, engine oil is supplied as lubricating oil from the oil supply passage 155 on the engine unit 150 to the oil passage 445 of the mounting screw 440 at a specified supply pressure, and the oil supply port 156 of the oil supply passage 155 opens in the screw mounting hole 152 of the threaded portion 444 into which the mounting screw 440 is screwed.

[0084] The lubricating oil supplied to the oil passage 445 is discharged between the inner circumference of the shaft hole 421 on the mounting portion 420 and the outer circumference of the shaft portion 443 of the mounting screw 440 to lubricate the sliding portion of the mounting screw 440 as the rocking shaft and the shaft hole 421. And the lubricating oil in the shaft hole 421 flows into the oil injection hole 431 from the oil introduction port 432. The lubricating oil flowing into the oil injection hole 431 is sprayed toward the moving chain from the oil discharge port 433 opening on the chain moving surface 111 to lubricate the chain directly and lubricate the chain moving surface 111 at the same time.

[0085] As described above, although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made on the premise of not departing from the scope of the claims of the present invention.

[0086] For example, the components of the above-mentioned multiple embodiments can be arbitrarily combined to form a chain guide.

[0087] In addition, although in the above embodiment, it has been described as a configuration mounted on the engine unit by a mounting screw, it may also be mounted by inserting the shaft hole of the mounting portion into a pivot protruding from the mounting surface of the engine unit or the like.

[0088] In addition, although it has been described as a configuration for supplying lubricating oil from the engine, in the case of a movable chain guide, it may also be configured to supply lubricating oil from the hydraulic tensioner to the shaft hole on the mounting portion. In the case of this configuration, it is only necessary to form an oil passage from the tensioner contact portion to the shaft hole on the mounting portion. In addition, it may also be configured to supply lubricating oil from both the engine and the hydraulic tensioner.

Claims

1. A chain guide is installed on the engine set by mounting screws and slidably guides the moving chain. It is characterized in that, The mounting portion is provided with a shaft hole through which the mounting screw passes, and has an oil injection passage for injecting lubricating oil supplied to the shaft hole at a specified pressure toward the chain, On the mounting surface facing the engine set, there is an oil introduction passage that connects the oil supply port of the engine set to the shaft hole, The chain guide is configured to be swingable about the mounting screw as a swing shaft, The oil introduction passage has an oil introduction groove portion at a position facing the oil supply port of the engine set, and the oil introduction groove portion is formed so as to extend along an arc centered on the swing shaft.

2. The chain guide according to claim 1, characterized in that, On the mounting screw, there is an oil passage that connects the oil supply port of the engine set to the shaft hole, The oil passage is formed such that the oil inlet opens at the axial tip of the mounting screw and the oil outlet opens at the side surface of the shaft portion of the mounting screw.

3. The chain guide according to claim 1, characterized in that, The oil injection passage is constituted by an oil injection hole whose oil inlet opens on the inner surface of the shaft hole, and a circumferential groove is formed at the position where the oil inlet of the oil injection hole opens on at least one of the inner surface of the shaft hole and the side surface of the mounting screw.

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