Vehicle chain tensioner

Abstract

This invention relates to a chain tensioner for a vehicle, comprising at least a body, a cover locked to one end of the body, and an actuating assembly disposed within the body and having a movable portion extending out to the other end of the body; the actuating assembly and the cover form a hydraulic chamber; an annular oil passage and a pressure relief annular passage are provided between the body and the cover; the body is provided with an oil supply passage and a drain passage; one end of the oil supply passage connects to the annular oil passage, and the other end connects to a lubricating oil passage located in the cylinder section; one end of the drain passage connects to the pressure relief annular passage, and the other end connects to the chain located in the cylinder section. The chamber has an oil inlet and an oil outlet. The oil inlet connects to the hydraulic chamber at one end and to the annular oil passage at the other end. The oil outlet connects to the hydraulic chamber at one end and to either the annular oil passage or the pressure relief annular passage at the other end. The lubricating oil in the hydraulic chamber can drive the actuator assembly to push against the timing chain guide rod. In this way, the tensioner can accurately push against the timing chain guide rod without using a high-power lubricating oil pump, and can quickly and effectively remove air and excess lubricating oil from the hydraulic chamber, thereby ensuring the tension of the timing chain.

Description

[Technical Field]

[0001] The present invention relates to a chain tensioner for a vehicle, and more particularly to a chain tensioner for a vehicle that can accurately push the timing chain guide rod without the need for a high-power lubricating oil pump, and can quickly and effectively remove gas and excess lubricating oil from the hydraulic chamber, thereby ensuring the tension of the timing chain. [Previous Technology]

[0002] Internal combustion engines require stable and precise intake, exhaust and ignition, so a tensioner is installed on the timing chain. In the field of tensioner technology, such as the CN100449172C patent, the removal of obstructing gases by the tensioner to ensure the tension of the timing chain has become an important issue that vehicle manufacturers urgently need to solve.

[0003] The main objective of this invention is to provide a chain tensioner for vehicles that does not require a high-power lubricating oil pump and can quickly and effectively remove gas and excess lubricating oil from the oil pressure chamber, thereby improving the versatility of the tensioner.

[0004] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, comprising at least a body, a cover locked to one end of the body, and an actuating assembly disposed within the body and having a movable portion extending out of the other end of the body; the actuating assembly and the cover form a hydraulic chamber; an annular oil passage and a pressure relief annular passage are provided between the body and the cover; the body is provided with an oil supply passage and a drain passage; one end of the oil supply passage is connected to the annular oil passage and the other end is connected to a lubricating oil passage located in the cylinder; one end of the drain passage is connected to the pressure relief annular passage and the other end is connected to the chain chamber located in the cylinder; the cover is provided with an oil inlet passage and an oil outlet passage; one end of the oil inlet passage is connected to the hydraulic chamber and the other end is connected to the annular oil passage; one end of the oil outlet passage is connected to the hydraulic chamber and the other end is connected to either the annular oil passage or the pressure relief annular passage; the lubricating oil in the hydraulic chamber can drive the actuating assembly to abut against the timing chain guide.

[0005] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein the oil inlet and the oil outlet are arranged in a manner with an upper and lower position difference or equal height.

[0006] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein the oil supply channel is obliquely connected to the lubricating oil passage and the annular oil passage.

[0007] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, the body having a locking part, a leak-proof gasket provided between the locking part and the cylinder part, the leak-proof gasket having a filter part composed of a plurality of fine holes; the filter part being located between the lubricating oil passage and the oil supply passage.

[0008] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, the body having an insertion portion having a receiving portion; the cover having a cavity; an actuating assembly disposed within the receiving portion of the body; the actuating assembly having a top plug cylinder, a positioning member for sliding the top plug cylinder, an elastic member passing through the top plug cylinder, and a flow-stopping member assembly disposed within the positioning member and pressed by the elastic member.

[0009] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein a portion of the positioning member slides in contact with the top plug cylinder and the other portion is positioned and abuts against the cover.

[0010] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein the oil inlet and the oil outlet are arranged with an upper and lower position difference; one of the connected oil supply channel, the annular oil channel and the oil inlet is provided with an oil supply obstruction; the drain channel is provided with a drain outlet; one of the oil outlet, the pressure relief annular channel and the drain channel is provided with an oil outlet obstruction; wherein the cross-sectional area of ​​the oil outlet obstruction is smaller than the cross-sectional area of ​​the oil supply obstruction and the cross-sectional area of ​​the drain outlet.

[0011] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein the oil inlet passage and the oil outlet passage are arranged at the same height; the annular oil passage and the pressure relief annular passage are provided with a connecting passage; one of the connected oil supply passage, the annular oil passage and the oil inlet passage is provided with an oil supply obstruction; the vent passage is provided with a vent outlet; one of the connecting passage, the pressure relief annular passage and the vent passage is provided with an oil outlet obstruction; wherein the cross-sectional area of ​​the oil outlet obstruction is smaller than the cross-sectional area of ​​the oil supply obstruction and the cross-sectional area of ​​the vent outlet.

[0012] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein a leak-proof gasket is provided between the body and the cover; the annular oil passage is located below the leak-proof gasket.

[0013] Therefore, some embodiments of the present invention provide a chain tensioner for a vehicle, wherein the pressure relief ring is higher than the ring oil passage.

[0014] The present invention achieves the following effects through some embodiments: the tensioner can accurately push the timing chain guide rod without the need for a high-power lubricating oil pump, and can quickly and effectively remove gas and excess lubricating oil from the hydraulic chamber, thereby ensuring the tension of the timing chain.

[0015] The present invention achieves the following effect through some embodiments: thereby ensuring that air and excess lubricating oil in the tensioner can be smoothly discharged, thereby ensuring the effective operation of the tensioner.

[0016] The present invention achieves the following effects through some embodiments: it facilitates the processing of the oil inlet channel and avoids excessive bending of the oil inlet channel, thereby allowing the lubricating oil to enter the tensioner more smoothly.

[0017] The present invention achieves the following effect through some embodiments: the lubricating oil is filtered by the filter before entering the oil supply channel from the lubricating oil channel, thereby ensuring the purity of the lubricating oil entering the tensioner and improving the accuracy of the tensioner operation.

[0018] The present invention can achieve the following effects through some embodiments: on the one hand, it can ensure the lubricating oil pressure of the tensioner, and on the other hand, it can ensure the tension of the tensioner against the timing chain guide rod.

[0019] The present invention achieves the following effect through some embodiments: thereby ensuring the accuracy of the tensioner's action against the timing chain guide rod.

[0020] The present invention achieves the following effect through some embodiments: it can ensure the oil pressure in the oil chamber even with a low-power lubricating oil pump, thereby ensuring the accuracy of the tensioning action of the tensioner.

[0021] The present invention achieves the following effect through some embodiments: it can ensure the oil pressure in the oil chamber even with a low-power lubricating oil pump, thereby ensuring the accuracy of the tensioning action of the tensioner.

[0022] The present invention can achieve the following effects through some embodiments: thereby improving the sealing performance of the body and the cover of the tensioner and the convenience of sealing processing; at the same time, it can quickly and effectively remove gas and excess lubricating oil from the hydraulic chamber, thereby ensuring the tension of the timing chain.

[0023] The present invention achieves the following effect through some embodiments: thereby ensuring the oil pressure in the hydraulic chamber. [Simplified Explanation of the Diagram]

[0044] [Figure 1] is a side view of the locomotive of the present invention.

[0045] [Figure 2] is a cross-sectional view of the cylinder section and tensioner of the present invention.

[0046] [Figure 3] is an exploded view of the tensioner of the present invention.

[0047] [Figure 4] is a cross-sectional view of the tensioner cover of the present invention.

[0048] [Figures 5, 6, and 7] are schematic diagrams of the lubrication and venting actions of the tensioner of the present invention.

[0049] [Figures 8 and 9] are schematic diagrams of the operation of the actuator assembly of the tensioner of the present invention.

[0050] [Figure 10] shows another embodiment of the oil outlet and oil inlet of the present invention.

Implementation Method

[0024] To make it easier for your examiner to understand the structure of the present invention and the effects it can achieve, the following description is provided in conjunction with the drawings; First, please refer to Figure 1. The vehicle of the present invention is illustrated by taking a motorcycle as an example. The motorcycle 1 includes at least a frame unit 2, a seat cushion 3 disposed on the frame unit 2, and a power unit 4.

[0025] As shown in Figure 1, in the following description, the left and right sides of the vehicle body are defined with the driver sitting on the locomotive 1, the driver's left side being the left side and the driver's right side being the right side. The frame unit 2 has a head tube section 21 at the front, and a steering mechanism 22 is connected above the head tube section 21. The steering mechanism 22 has a steering handle 221 that controls the direction of travel. The head tube section 21 is connected to a descending tube section 23 at the rear of the vehicle body. Below the descending tube section 23 are a pair of foot pedal sections 24 extending towards the rear of the vehicle body and slightly horizontal. A foot pedal cross tube 241 connects the end of the descending tube section 23 to the pair of foot pedal sections 24. The foot pedal sections 24 extend towards the rear of the vehicle body with a pair of... The side frame portion 25 has an ascending section 251 adjacent to the pedal tube portion 24 and an extension section 252 located at the rear of the vehicle body. A pair of auxiliary tubes 253 are provided between the ascending section 251 and the extension section 252 of the side frame portion 25, and a pair of extension members 254 extend from the ascending section 251 to the rear of the vehicle body. A front fork unit D composed of a front shock absorber is pivotally mounted below the head tube portion 21, and a front wheel FW is pivotally mounted at the lower end of the front fork unit D.

[0026] As shown in Figure 1, a slightly flat footrest P is provided on the slightly horizontal foot tube section 24 of the frame unit 2, which forms a flat footrest for the driver to rest his feet; a fuel tank T for storing fuel for the combustion of the power unit 4 is installed in the internal space defined between the two slightly horizontal foot tube sections 24. The power unit 4 is connected to the frame unit 2 and is located further towards the rear of the vehicle body from the fuel tank T.

[0027] As shown in Figure 1, the side frame 25 is provided with a seat cushion 3 for the driver to sit on above the extension section 252, and a storage box 5 is provided on the extension section 252 and below the seat cushion 3. The power unit 4 is locked to the auxiliary tube 253 and the extension member 254 of the side frame 25. The power unit 4 is supported on the frame unit 2 in a swingable or non-swinging manner. The power unit 4 drives the rear wheel RW.

[0028] As shown in Figure 1, the power unit 4 is an internal combustion engine system; the power unit 4 includes a cylinder section 41 and a transmission section 42. The cylinder section 41 extends forward toward the vehicle body in a slightly inclined manner and partially extends beyond the rising section 251 of the side frame section 25, that is, the portion of the cylinder section 41 extending forward toward the vehicle body extends further forward than the rising section 251 of the side frame section 25; the transmission section 42 is located on the rear right side of the cylinder section 41. The transmission section 42 includes a belt continuously variable transmission system. The transmission section 42 drives the rear wheel RW towards the rear end of the vehicle body; the cylinder section 41 is connected to an exhaust device M. The exhaust device M extends from the outside of the power unit 4 toward the rear of the vehicle body. The exhaust device M is provided with a heat insulation cover M1 on the outside of the vehicle body in the width direction.

[0029] As shown in Figures 1 and 2, the cylinder section 41 extends forward toward the vehicle body at a slightly inclined manner and partially extends beyond the rising section 251 of the side frame section 25, meaning that the portion of the cylinder section 41 extending forward toward the vehicle body extends further forward than the rising section 251 of the side frame section 25; the cylinder section 41 has a cylinder body 411 and a cylinder head 412 assembled on the cylinder body 411; the cylinder body 411 is disposed above a crankcase 43, and the transmission section 42 is connected to one side of the crankcase 43; the fresh air required for combustion of the power unit 4 is supplied by an air filter. The air is supplied by a filter (not shown in the diagram). This air filter cleans the outside air and then introduces it into the cylinder 41 through the intake pipe connected to the air filter and the cylinder 41 of the power unit 4. There, it mixes with the fuel supplied from the fuel tank T and ignites within the cylinder 41, thereby generating power for the power unit 4. A camshaft seat 413 is provided on the cylinder head 412. A camshaft 414 is provided on the camshaft seat 413. A timing sprocket 415 is provided on one side of the camshaft 414. A timing chain 416 is fitted onto the timing sprocket 415. The other end is connected to the crankshaft 431 inside the crankcase 43, thereby the crankshaft 431 can drive the camshaft 414 via the timing chain 416 and the timing sprocket 415. Furthermore, the cylinder head 412 has a chain chamber 417 on one side of the cylinder body 411, and the timing sprocket 415 and timing chain 416 are located within the chain chamber 417. The timing chain 416 has timing chain guides 418 on both sides within the chain chamber 417 to limit the tension of the timing chain 416. The timing chain 416 is mounted on the cylinder body 411 to maintain tension. A tensioner 6 is provided, which extends from the outside of the cylinder body 411 into the chain chamber 417 and abuts against the timing chain guide rod 418. By the tensioner 6 pressing against the timing chain guide rod 418, the timing chain guide rod 418 pushes against the timing chain 416, thereby maintaining a certain tension on the timing chain 416. The cylinder head 412 is provided with an intake valve V on the intake side and an exhaust valve V1 on the exhaust side. The intake valve V can be pushed by the intake valve pusher, and the exhaust valve V1 can be pushed by the exhaust valve pusher. The timing chain 416 is located on the side of the cylinder body 411.

[0030] As shown in Figure 1, the locomotive 1 is provided with a body cover unit 7 on the outer periphery of the frame unit 2. The body cover unit 7 includes a front cover 71 that can cover part of the steering mechanism 22, a front body cover 72 that covers the front of the body, a knee cover 73 located behind the front body cover 72, side body covers 74 located on both sides below the seat cushion 3, and a central body cover 75 located below the seat cushion 3. The central body cover 75 can be extended from the side body covers 74 on both sides or is an independent cover.

[0031] As shown in Figures 2, 3, 4, 5, and 6, the tensioner 6 has a body 61, a cover 62 locked onto the body 61, and an actuating assembly 63 disposed within the body 61; a cover mounting portion 611 on one side of the body 61 is provided for locking the cover 62, the cover mounting portion 611 has internal threads 611a, and the cover mounting portion 611 has an annular anti-leakage washer mounting groove 612 recessed inward from its outer edge, the anti-leakage washer mounting groove 612 is provided for mounting an anti-leakage washer 613; the cover mounting portion 611 of the body 61 forms a pressure relief annular channel 6 in a stepped manner from the anti-leakage washer mounting groove 612 further inward and downward. 14. The pressure relief ring 614 connects to the discharge channel 6141; the main body 61 has an insertion part 615 protruding from the opposite end of the cover mounting part 611, the insertion part 615 has a receiving part 616 that passes through the entire main body 61, and more specifically, the receiving part 616 is formed by a through hole, the receiving part 616 can accommodate the actuating assembly 63, and the discharge channel 6141 is arranged along the axial direction of the receiving part 616; the main body 61 has locking parts 617 extending on both sides of the outer circumference of the cover mounting part 611, the locking parts 617 are implemented by a pair of left and right extended locking lugs in this invention; the locking parts 617 have through holes 6171; the tensioner 6 is provided by The insertion part 615 of the main body 61 is inserted into the tensioner mounting part 411b of the cylinder body 411 and extends into the chain chamber 417. Then, the locking element S is inserted into the through hole 6171 of the locking part 617, securing it firmly to the tensioner mounting part 411b. The drain channel 6141 connects to the chain chamber 417, allowing excess lubricating oil and gas in the tensioner 6 to drain into the chain chamber 417 through the drain channel 6141. This ensures the tensioner 6 has a stable oil pressure tension and prevents air lock from affecting the tension of the tensioner 6. The drain channel 6141 has a drain outlet 61 with a small cross-sectional area near the side adjacent to the chain chamber 417. 42; The main body 61 has an oil supply channel 618 at the insertion part 615 and adjacent to the cover mounting part 611. The oil supply channel 618 is obliquely connected from the insertion part 615 to the cover mounting part 611 to the annular oil passage 625 of the cover 62. More specifically, one end of the oil supply channel 618 is connected to the annular oil passage 625 of the cover 62, and the other end is connected to the lubrication oil passage 411a of the cylinder body 411. More specifically, the lubricating oil from the crankcase 43, which is drawn by the lubricating oil pump (not shown in the figure) to lubricate the cylinder part 41 and the various components of the crankcase 43, enters the tensioner 6 through the lubrication oil passage 411a, the oil supply channel 618, and the annular oil passage 625.The locking portion 617 of the main body 61 is provided with a leak-proof gasket 64 on its outer side. The leak-proof gasket 64 has a through portion 641 in the center, through portion 641 through which the insertion portion 615 can pass. The leak-proof gasket 64 has through holes 642 on both sides of the through portion 641, and the through holes 642 correspond to the through holes 6171 of the locking portion 617. The leak-proof gasket 64 has at least one small flow channel on one side between the through portion 641 and the through holes 642. The filter section 643, formed by through-holes, is implemented in this invention using a plurality of small through-holes. The filter section 643 corresponds to the oil supply channel 618, meaning it is located between the oil supply channel 618 and the lubricating oil passage 411a. This allows the lubricating oil to be filtered by the filter section 643 before entering the oil supply channel 618 from the lubricating oil passage 411a, thereby ensuring the purity of the lubricating oil entering the tensioner 6.

[0032] As shown in Figures 2, 3, 4, 5, 6, 7, and 10, a locking cap portion 621 is provided on one outer end of the cover 62, and a flange portion 622 protrudes from the lower part of the locking cap portion 621 towards the outer periphery; a threaded portion 623 protrudes from the opposite side of the locking cap portion 621 on the cover 62, and an external thread 623a is provided on the outer periphery of the threaded portion 623. The threaded portion 623 has a chamber 624 coaxial with the threaded portion 623 and open at one end. The chamber 624 can accommodate lubricating oil to form an oil pressure chamber A. Furthermore, the oil pressure chamber A can be formed by the chamber 624 alone or together with the rear section of the accommodating portion 616 of the body 61; a large diameter portion 6241 and a small diameter portion 62 are formed in a stepped manner within the chamber 624. 42. The small-diameter portion 6242 is adjacent to the locking cap portion 621 and partially extends into the locking cap portion 621. The large-diameter portion 6241 is adjacent to the open end of the chamber 624. The threaded portion 623 has an annular oil passage 625 recessed on its outer periphery adjacent to the flange portion 622. In the implementation of the present invention, the pressure relief annular passage 614 is designed to be higher than the annular oil passage 625. The annular oil passage 625 has an oil inlet passage 626 that penetrates the chamber 624. The threaded portion 623 has an oil outlet passage 627 that penetrates the chamber 624 between the annular oil passage 625 and the flange portion 622. More specifically, the oil outlet passage 627 is closer to the flange portion 622 than the oil inlet passage 626. As shown in Figure 4, the oil outlet passage 627 is located above the oil inlet passage 626. In this invention, the oil outlet 627 and the oil inlet 626 are arranged with a vertical difference. Alternatively, they can be arranged at the same height. When they are arranged at the same height, the annular oil passage 625 and the pressure relief annular passage 614 are connected by a connecting channel 628. The cover 62 is screwed into the cover mounting portion 611 of the body 61 by the screw portion 623. After the cover 62 is screwed into the cover mounting portion 611 of the body 61 by the screw portion 623, the annular oil passage 625 of the cover 62, which communicates with the oil supply channel 618 of the body 61, is restricted by the screw portion 623, forming an oil supply obstruction 618. 1. At the oil outlet 627 of the cover 62, which is connected to the pressure relief ring 614 of the main body 61, an oil outlet 6271 is formed by the screw part 623 of the cover 62; that is, an oil supply 6181 is provided at one of the connected oil supply channels 618, the ring oil channel 625 and the oil inlet channel 626; the discharge channel 6141 is provided with a discharge outlet 6142; an oil outlet 6271 is provided at one of the connected oil outlet 627, the pressure relief ring 614 and the discharge channel 6141 (the connecting channel 628 is also the oil outlet 6271); wherein, the cross-sectional area of ​​the oil outlet 6271 is smaller than the cross-sectional area of ​​the oil supply 6181 and the cross-sectional area of ​​the discharge outlet 6142.

[0033] As shown in Figures 2, 3, 4, 5, and 6, the actuator assembly 63 is inserted into the receiving portion 616 of the body 61. The actuator assembly 63 has a top plug 631, a positioning member 632 for sliding the top plug 631, an elastic member 633 passing through the positioning member 632, and a flow-stopping member assembly 634 disposed in the positioning member 632 and pressed by the elastic member 633. The top plug 631 has a receiving hole 6311, which is a blind hole. More specifically, the opening of the receiving hole 6311 faces the cover 62. The receiving hole 6311 has a large diameter portion 6311a and a small diameter portion 6311b. The end of the receiving hole 6311 is provided with a protrusion 6312, which can be used as a positioning element for one end of the elastic member 633.

[0034] As shown in Figures 2, 3, 5, 7, 8, and 9, the positioning member 632 is a tubular body with a through hole; a part of the positioning member 632 slides in contact with the top plug cylinder 631, and the other part is positioned and abuts against the cover body 62.

[0035] As shown in Figures 2, 3, 5, 7, 8, and 9, the elastic member 633 is inserted into the receiving hole 6311 of the top plug cylinder 631. One end of the elastic member 633 is inserted into the small diameter portion 6311b of the receiving hole 6311, and the end of the elastic member 633 extending into the small diameter portion 6311b of the receiving hole 6311 abuts against the bottom of the receiving hole 6311. More specifically, the end of the elastic member 633 extending into the small diameter portion 6311b of the receiving hole 6311 surrounds the protrusion 6312 and abuts against the bottom of the receiving hole 6311. In this way, the small diameter portion 6311b and the protrusion 6312 can form a positioning effect on the portion of the elastic member 633 extending into the small diameter portion 6311b of the receiving hole 6311.

[0036] As shown in Figures 2, 3, 5, 7, 8, and 9, the flow-stopping component assembly 634 is inserted into the receiving hole 6311 of the top plug cylinder 631; the flow-stopping component assembly 634 has a flow-limiting component 6341, a stop component 6342 that can stop the flow of the flow-limiting component 6341, a spring 6343 that can push the stop component 6342, and a pusher 6344 that can push the stop component 6342 and be pushed by the elastic component 633; ​​the outer diameter of the flow-limiting component 6341 matches the positioning component 632, thereby the flow-limiting component 6341 can be supported on one end of the positioning component 632; the flow-limiting component 6341 has a through flow-limiting hole 63411 in the center.

[0037] As shown in Figures 2, 3, 5, 7, 8, and 9, the stop member 6342 is disposed on one end of the flow limiting member 6341, or more specifically, the stop member 6342 is disposed on one end of the flow limiting hole 63411 of the flow limiting member 6341, thereby blocking the flow limiting member 6341 to form a flow stop; the stop member 6342 of the present invention is implemented as a sphere.

[0038] As shown in Figures 2, 3, 5, 7, 8, and 9, the spring 6343 is abutted against the stop member 6342; furthermore, one side of the stop member 6342 can block the flow limiting hole 63411 of the flow limiting member 6341, while the other side is abutted by the spring 6343.

[0039] As shown in Figures 2, 3, 5, 7, 8, and 9, the pusher 6344 has a flange extending outward on one side to form a stop portion 63441. The spring 6343 and the stop member 6342 can be accommodated in the pusher 6344 within the stop portion 63441. The stop portion 63441 can be used for the abutment of the elastic member 633. Furthermore, one end of the elastic member 633 abuts against the bottom of the receiving hole 6311, and the other end abuts against the stop portion 63441 of the pusher 6344. Thus, the elastic member 633 can push the pusher 6344 to advance the spring 6343 and the stop member 6342 toward the flow-limiting hole 63411 of the flow-limiting member 6341, thereby causing the stop member 6342 to block the flow-limiting hole 63411 and form a flow stop.

[0040] As shown in Figures 2, 3, 4, 5, 7, 8, and 9, in a specific embodiment of the tensioner 6 of the present invention, the tensioner 6 is inserted into the tensioner mounting portion 411b of the cylinder body 411 by the insertion portion 615 of the body 61, and extends into the chain chamber 417. After being locked by the locking element S through the locking portion 617, it is securely locked onto the tensioner mounting portion 411b. A leak-proof gasket 64 is provided between the locking portion 617 of the body 61 and the outer side of the tensioner mounting portion 411b of the cylinder body 411. When the power unit 4 starts operating, the lubricating oil from the crankcase 43, drawn by the lubricating oil pump (not shown in the diagram) to lubricate the cylinder section 41 and the various components of the crankcase 43, enters the oil pressure chamber A of the tensioner 6 through the lubricating oil passage 411a, the oil supply passage 618, and the annular oil passage 625. The lubricating oil entering the oil pressure chamber A of the tensioner 6 is first filtered by the filter part 643 of the leak-proof gasket 64 before entering the tensioner 6 through the oil supply passage 618 and the annular oil passage 625. The lubricating oil is supplied through the annular oil passage 62 of the cover 62. 5. The oil enters the hydraulic chamber A (chamber 624) through the inlet 626, and the lubricating oil in the hydraulic chamber A pushes the stop member 6342 by its own oil pressure (at the same time, the elastic member 633 is also pushed and retracted). At this time, the flow limiting hole 63411 of the flow limiting member 6341 of the flow limiting member assembly 634 is open, and the lubricating oil enters the top plug cylinder 631 of the actuator assembly 63 through the flow limiting hole 63411, and pushes the top plug cylinder 631 towards the chain chamber 417, so that the top of the top plug cylinder 631 can push against the timing chain guide. The lever 418 allows the timing chain 416 to maintain a certain tension. At the same time, the gas originally stored inside the tensioner 6, together with the excess lubricating oil that enters the tensioner 6, is discharged through the oil outlet 627 of the cover 62, which is connected to the pressure relief ring 614 of the body 61. The oil outlet 627 is connected to the drain channel 6141 of the insertion part 615, and then drains into the chain chamber 417 through the drain channel 6141. This allows the tensioner 6 to have a stable oil pressure tension and avoids air locks that would affect the tension of the tensioner 6.

[0041] As shown in Figures 2, 3, 4, 5, 7, 8, and 9, as described above, when the power unit 4 stops operating, the lubricating oil from the crankcase 43 no longer enters the oil pressure chamber A of the tensioner 6. At this time, the oil pressure of the lubricating oil is reduced to an insufficient level to push against the stop member 6342, that is, the oil pressure of the lubricating oil is less than the elasticity of the elastic member 633. The elastic member 633 uses its own elastic force to push against the pusher 6344, the spring 6343, and the stop member 63 of the flow-stopping assembly 634. 42. The stop member 6342 is pushed toward the flow limiting hole 63411 of the flow limiting member 6341 and plugs the flow limiting hole 63411 into a closed state. The lubricating oil that originally entered the top plug cylinder 631 of the actuator assembly 63 no longer flows out of the flow limiting hole 63411. That is, the lubricating oil in the top plug cylinder 631 of the actuator assembly 63 maintains a certain lubricating oil pressure, so that the top plug cylinder 631 can continue to push the timing chain guide rod 418, thereby allowing the timing chain 416 to maintain a certain tension.

[0042] The main feature of the present invention is that the tensioner 6 includes at least a body 61, a cover 62 locked to one end of the body 61, and an actuator assembly 63 disposed inside the body 61 and having a movable portion extending out of the other end of the body 61; the actuator assembly 63 and the cover 62 form a hydraulic chamber A; an annular oil passage 625 and a pressure relief annular passage 614 are provided between the body 61 and the cover 62; the body 61 is provided with an oil supply passage 618 and a drain passage 6141; one end of the oil supply passage 618 is connected to the annular oil passage 625 and the other end is connected to the lubricating oil passage 411a located in the cylinder portion 41; one end of the drain passage 6141 is connected to the pressure relief annular passage 614 and the other end is connected to the... The chain chamber 417 of the cylinder section 41 is provided with an oil inlet passage 626 and an oil outlet passage 627. One end of the oil inlet passage 626 is connected to the hydraulic chamber A and the other end is connected to the annular oil passage 625. One end of the oil outlet passage 627 is connected to the hydraulic chamber A and the other end is connected to either the annular oil passage 625 or the pressure relief annular passage 614. The lubricating oil in the hydraulic chamber A can drive the actuator assembly to push against the timing chain guide rod 418. In this way, the tensioner 6 can accurately push the timing chain guide rod 418 without the need for a high-power lubricating oil pump, and can quickly and effectively remove the gas and excess lubricating oil in the hydraulic chamber A, thereby ensuring the tension of the timing chain 416.

[0043] In summary, the present invention, through the above-described structure, can improve upon the deficiencies of conventional inventions and achieve the claimed objectives. It has indeed improved the efficacy compared to conventional inventions and clearly possesses the requirements of novelty, utility, and progress. Therefore, this invention application is filed in accordance with the law. I respectfully request your careful consideration and granting of a patent. I would be most grateful for your assistance.

Claims

1. A chain tensioner for a vehicle, comprising at least a body, a cover directly locked to one end of the body, and an actuating assembly disposed within the body and having a movable portion extending out of the other end of the body; the actuating assembly and the cover forming a hydraulic chamber; an annular oil passage and a pressure relief annular passage being provided between the body and the cover directly locked thereon; the body having an oil supply passage and a drain passage; the downstream end of the oil supply passage connecting to the annular oil passage and the upstream end connecting to a lubricating oil passage located in the cylinder section; the upstream end of the drain passage connecting to the pressure relief annular passage and the downstream end connecting to a chain chamber located in the cylinder section; the cover having an oil inlet passage and an oil outlet passage; the upstream end of the oil inlet passage connecting to the hydraulic chamber and the downstream end connecting to the annular oil passage; the upstream end of the oil outlet passage connecting to the hydraulic chamber and the downstream end connecting to either the annular oil passage or the pressure relief annular passage, and directly or indirectly connecting to the drain passage; the lubricating oil in the hydraulic chamber can drive the actuating assembly to actuate and push against the timing chain guide rod.

2. The chain tensioner for the vehicle as described in claim 1, wherein, The oil inlet and the oil outlet are set up by means of vertical difference or equal height.

3. The chain tensioner for the vehicle as described in claim 1, wherein, The oil supply channel is obliquely connected to the lubricating oil passage and the annular oil passage.

4. The chain tensioner for the vehicle as described in claim 1, wherein, The main body has a locking part, and a leak-proof gasket is provided between the locking part and the cylinder part. The leak-proof gasket has a filter part composed of a plurality of fine holes. The filter part is located between the lubricating oil passage and the oil supply passage.

5. The chain tensioner for the vehicle as described in claim 1, wherein, The main body has an insertion part, which has a receiving part; the cover has a cavity; the actuating assembly is disposed in the receiving part of the main body; the actuating assembly has a top plug, a positioning member for sliding the top plug, an elastic member inserted in the top plug, and a flow-stopping member assembly disposed in the positioning member and pressed by the elastic member.

6. The chain tensioner for the vehicle as described in claim 5, wherein, One part of the positioning element slides in contact with the top plug cylinder, while the other part is positioned and abuts against the cover.

7. The chain tensioner for the vehicle as described in claim 1, wherein, The oil inlet and the oil outlet are configured with an upper and lower position difference; one of the connected oil supply channel, the annular oil channel and the oil inlet is provided with an oil supply obstruction; the discharge channel is provided with a discharge outlet; one of the oil outlet, the pressure relief annular channel and the discharge channel is provided with an oil outlet obstruction; wherein, the cross-sectional area of ​​the oil outlet obstruction is smaller than the cross-sectional area of ​​the oil supply obstruction and the cross-sectional area of ​​the discharge outlet.

8. The chain tensioner for the vehicle as described in claim 1, wherein, The oil inlet and the oil outlet are set at the same height; the annular oil channel and the pressure relief annular channel are connected by a connecting channel; one of the connected oil supply channel, the annular oil channel and the oil inlet channel is provided with an oil supply obstruction; the discharge channel is provided with a discharge outlet; one of the connecting channel, the pressure relief annular channel and the discharge channel is provided with an oil outlet obstruction; wherein, the cross-sectional area of ​​the oil outlet obstruction is smaller than the cross-sectional area of ​​the oil supply obstruction and the cross-sectional area of ​​the discharge outlet.

9. The chain tensioner for the vehicle as described in claim 1, wherein, A leak-proof gasket is provided between the body and the cover; the annular oil passage is located below the leak-proof gasket.

10. A chain tensioner for a vehicle as described in claim 1, 7, or 8, wherein, The pressure relief ring is higher than the oil passage of the ring.

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