Tensioner, engine and vehicle with same

Abstract

The invention discloses a tensioner, an engine and a vehicle with the tensioner, the tensioner comprises a shell, the shell is provided with a cavity and a medium inlet, the end, in the first direction, of the cavity is opened to form a first opening, and the medium inlet communicates with the cavity; the plunger is arranged in the cavity, part of the plunger extends out of the first opening, and the plunger can move in the first direction; the valve is arranged in the cavity, located between the medium inlet and the plunger and used for supplying oil to flow to the plunger from the medium inlet, and a cavity formed among the shell, the plunger and the valve is a sealed cavity. According to the tensioner, the cavity formed among the shell, the plunger and the valve is the sealed cavity, a certain amount of oil can be stored in the cavity, oil pressure counter-force can be directly generated when an engine is restarted, the situation that the pressure building speed in the cavity is low is improved, the effectiveness of the tensioner is improved, and shaking of a chain is effectively restrained; noise is avoided, and the cold start NVH performance is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a tensioner, an engine and a vehicle having the same. Background Art

[0002] A hydraulic tensioner uses compressed liquid (usually hydraulic oil) to create tension and release. Existing technology typically features a vent at the end of the tensioner's plunger. This vent releases air and often causes oil to leak out, slowing the pressure buildup in the tensioner's high-pressure chamber during engine restart. This in turn causes chain shake and noise, resulting in poor cold-start NVH (noise, vibration, and harshness). Summary of the Invention

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention proposes a tensioner that can improve the slow pressure buildup in the cavity, increase the tensioner's effectiveness, effectively suppress chain sway, avoid noise generation, and thus improve cold-start NVH performance.

[0004] The present invention also provides an engine, comprising the above-mentioned tensioner.

[0005] The present invention also provides a vehicle, comprising the above-mentioned engine.

[0006] A tensioner according to an embodiment of the present invention includes: a housing having a cavity and a medium inlet, one end of which is open in the first direction to form a first open port, and the medium inlet is connected to the cavity; a plunger, which is arranged in the cavity and partially extends from the first open port, and is movable along the first direction; a valve, which is arranged in the cavity and located between the medium inlet and the plunger, and is used to supply oil from the medium inlet to the plunger, and the cavity formed between the housing, the plunger and the valve is a sealed cavity.

[0007] The tensioner according to the embodiments of the present invention eliminates the vent hole on the plunger in the prior art, creating a sealed cavity between the housing, plunger, and valve. This prevents oil from escaping through the vent hole, allowing a certain amount of oil to be stored within the cavity. This allows for direct oil pressure reaction during engine restart, improving the slow pressure buildup within the cavity, enhancing the tensioner's effectiveness, effectively suppressing chain shake, and preventing noise, thereby improving cold-start NVH performance. The gas discharge improves unstable damping force and enhances the stability of the timing system.

[0008] In addition, the tensioner according to the present invention may also have the following additional technical features:

[0009] In some embodiments, the housing has an air leakage hole, which is in communication with the cavity and is located on a side of the valve facing away from the plunger.

[0010] In some embodiments, the angle between the axis of the air leakage hole and the axis of the cavity is an acute angle, and the end of the air leakage hole outside the cavity is located on the side of the end of the air leakage hole inside the cavity away from the first opening.

[0011] In some embodiments, the medium inlet and the air leakage hole are located on opposite sides of the cavity.

[0012] In some embodiments, along the first direction, the cavity includes a first cavity and a second cavity that are interconnected, the cross-sectional area of the first cavity is smaller than the cross-sectional area of the second cavity, the medium inlet is connected to the first cavity, the first open port is provided at an end of the second cavity facing away from the first cavity, the valve is provided at an end of the second cavity close to the first cavity, and part of the plunger is provided in the second cavity.

[0013] In some embodiments, the valve has an air leakage channel for allowing oil and gas on a side of the valve facing the plunger to flow to a side of the valve facing away from the plunger.

[0014] In some embodiments, the air leakage channel includes a first sub-air leakage channel and a second sub-air leakage channel that are interconnected. The first sub-air leakage channel is located on the outer peripheral wall of the valve and passes through the valve along the first direction. The second sub-air leakage channel is provided on the end face of the valve facing away from the plunger.

[0015] In some embodiments, the second sub-leakage channel includes a first channel and a second channel that are interconnected, the first channel is connected to the first sub-leakage channel and extends in a ring shape along the circumferential direction of the valve, and the second channel extends along the radial direction of the valve; or, at least a portion of the second sub-leakage channel extends along the circumferential direction of the valve.

[0016] In some embodiments, the plunger has a third cavity, and the side of the third cavity facing the valve has a second opening. The tensioner also includes: an elastic member, which is at least partially arranged in the third cavity, and one end of the elastic member in the length direction is abutted against the end of the third cavity away from the second opening, and the other end is abutted against the valve, for driving the plunger to move in a direction away from the valve.

[0017] In some embodiments, a gap is provided between an outer peripheral wall of the plunger and an inner peripheral wall of the housing.

[0018] In some embodiments, the outer peripheral wall of the plunger has a slot, and the tensioner further includes: a retaining spring, which is disposed in the slot and is used to abut against the housing in the first direction to limit the movement of the plunger toward the valve.

[0019] In some embodiments, the inner circumferential wall of the shell has a limiting groove, which extends along the circumferential direction of the shell. Along the first direction, the retaining spring is movable in the limiting groove.

[0020] In some embodiments, the shell has a through opening, the through opening passes through the bottom wall of the limiting groove, and the outer peripheral wall of the retaining spring has a limiting protrusion, and the limiting protrusion is located in the through opening.

[0021] The present invention also provides an engine having the above embodiment.

[0022] According to the engine of the embodiment of the present invention, by providing the above-mentioned tensioner and eliminating the exhaust hole on the plunger in the prior art, the cavity formed between the housing, the plunger and the valve is a sealed cavity, which can prevent oil from flowing out of the exhaust hole, so that a certain amount of oil can be stored inside the cavity, and can directly generate oil pressure reaction force when the engine is restarted, thereby improving the slow pressure building speed in the cavity, improving the effectiveness of the tensioner, effectively suppressing chain shaking, avoiding the generation of noise, and thereby improving the cold start NVH performance.

[0023] The present invention also provides a vehicle having the above embodiment.

[0024] According to an embodiment of the present invention, a vehicle is provided with the above-mentioned engine. By eliminating the exhaust hole on the plunger in the prior art, the cavity formed between the housing, the plunger and the valve is made into a sealed cavity, which can prevent oil from flowing out of the exhaust hole, so that a certain amount of oil can be stored inside the cavity. When the engine is restarted, an oil pressure reaction force can be directly generated, thereby improving the slow pressure building speed in the cavity, improving the effectiveness of the tensioner, effectively suppressing chain shaking, avoiding the generation of noise, and thereby improving the cold start NVH performance.

[0025] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0027] Figure 1 is a front view of a tensioner according to an embodiment of the present invention;

[0028] Figure 2 It is along Figure 1 Cross-sectional view along line AA;

[0029] Figure 3 is a left side view of a valve of a tensioner according to an embodiment of the present invention;

[0030] Figure 4 FIG. 4 is a top view of a valve of a tensioner according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 100. Tensioner;

[0033] 1. Shell; 11. Cavity; 111. First cavity; 112. Second cavity; 12. Medium inlet; 13. Air vent; 14. First opening; 15. Limiting groove; 16. Through-opening;

[0034] 2. Plunger; 21. Third cavity; 22. Second opening; 23. Card slot;

[0035] 3. Valve; 31. Valve seat; 311. Inlet; 32. Steel ball; 33. Valve body; 34. Air release channel; 341. First sub-air release channel; 342. Second sub-air release channel; 343. First channel; 344. Second channel;

[0036] 4. Elastic parts;

[0037] 5. Circlip; 51. Limiting protrusion. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0041] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] The tensioner 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0043] like Figure 2 As shown, a tensioner 100 according to an embodiment of the present invention includes a housing 1 , a plunger 2 and a valve 3 .

[0044] Specifically, refer to the attached Figure 1 and attached Figure 2 As shown, the housing 1 can protect the internal structure of the tensioner 100, prevent the internal structure of the tensioner 100 from being exposed and damaged, and is conducive to extending the service life of the tensioner 100. The housing 1 has a cavity 11 and a medium inlet 12. One end of the cavity 11 along the first direction is open to form a first open port 14, wherein the first direction can be Figure 2 The length direction of the cavity 11 shown (see attached Figure 2 The medium inlet 12 is connected to the cavity 11, and the oil flows into the cavity 11 from the medium inlet 12. The plunger 2 is arranged in the cavity 11 and partially extends out of the housing 1 from the first opening 14. The plunger 2 is movable along the first direction. The plunger 2 is connected to the chain through a tensioning plate and a guide plate. When the chain shakes, the plunger 2 moves along the first direction to always counteract the tensioning plate, which can limit the chain shaking and maintain the stability of the timing system.

[0045] Further, refer to the attached Figure 2As shown, the valve 3 is arranged in the cavity 11 and is located between the medium inlet 12 and the plunger 2, and is used to supply oil from the medium inlet 12 to the plunger 2. Specifically, the valve 3 includes a valve seat 31, a valve body 33 and a steel ball 32. The valve seat 31 is fixed in the cavity 11 and has an inlet 311, which can prevent oil leakage when the valve 3 is closed. The valve body 33 is used to accommodate components such as the valve seat 31 and the steel ball 32 and constitute a channel for oil, which can control the direction, pressure and flow of oil flow. When the pressure of the oil can push the steel ball 32, the steel ball 32 is separated from the valve seat 31, and the valve 3 is opened to supply oil from the medium inlet 12 to the plunger 2; when the pressure of the oil is insufficient to push the steel ball 32, the steel ball 32 is reset, the steel ball 32 is against the valve seat 31, the valve 3 is closed, and the oil cannot flow from the medium inlet 12 to the plunger 2.

[0046] It should be noted that the tensioner 100 of the embodiment of the present invention can be used for a horizontally opposed engine. The tensioner 100 is arranged vertically, and the cavity 11 is arranged in the up-down direction (such as Figure 2 As shown), the medium inlet 12 is located at the upper end of the cavity 11, and the plunger 2 is located on the lower side of the valve 3. When the chain moves, due to the crankshaft torsional vibration of the crankshaft, it is easy to cause the chain between the camshaft and the crankshaft to swing. The setting of the tensioner 100 can limit the chain shaking and maintain the stability of the timing system.

[0047] Further, see the attached Figure 2 As shown, the cavity formed between the housing 1, plunger 2, and valve 3 is a sealed cavity, and no vent is provided on the inner wall of the cavity formed by the housing 1, plunger 2, and valve 3. It is understood that in the prior art, the plunger of a vertically arranged tensioner is often arranged upward, and the upper end of the plunger is provided with a vent to discharge gas within the tensioner. However, the tensioner 100 of the embodiment of the present invention is designed for a solution with the plunger 2 facing downward, eliminating the vent on the plunger in the prior art to prevent oil from flowing out of the vent. This allows a certain amount of oil to be stored within the cavity 11, which can directly generate an oil pressure reaction force when the engine is restarted, improving the slow pressure buildup in the cavity 11, improving the effectiveness of the tensioner 100, effectively suppressing chain shaking, and preventing noise generation, thereby improving cold start NVH (noise, vibration, and harshness) performance.

[0048] According to the tensioner 100 of the embodiment of the present invention, the exhaust hole on the plunger in the prior art is eliminated, and the cavity formed between the housing 1, the plunger 2 and the valve 3 is a sealed cavity, which can prevent oil from flowing out of the exhaust hole, so that a certain amount of oil can be stored inside the cavity 11. When the engine is restarted, an oil pressure reaction force can be directly generated, thereby improving the slow pressure build-up speed in the cavity 11, improving the effectiveness of the tensioner 100, effectively suppressing chain shaking, avoiding the generation of noise, and thereby improving the cold start NVH performance.

[0049] In some embodiments of the present invention, Figure 2 As shown, the housing 1 has an air bleed hole 13, which is connected to the cavity 11 and is located on the side of the valve 3 away from the plunger 2. The gas in the cavity 11 can be discharged through the air bleed hole 13, which can improve the problem of unstable damping force and improve the stability of the timing system. By locating the air bleed hole 13 on the side of the valve 3 away from the plunger 2, the distance between the air bleed hole 13 and the end of the plunger 2 away from the medium inlet 12 can be increased as much as possible, preventing oil from flowing out of the air bleed hole 13, allowing more oil to be stored in the cavity 11, further increasing the pressure building speed in the cavity 11, improving the effectiveness of the tensioner 100, effectively suppressing chain shaking, avoiding the generation of noise, and thus improving the cold start NVH performance.

[0050] Of course, the present invention is not limited thereto, and the vent hole 13 may also be located on the side of the valve 3 facing the plunger 2, and can similarly discharge the gas in the cavity 11, thereby improving the problem of unstable damping force and improving the stability of the timing system.

[0051] In some embodiments of the present invention, Figure 2 As shown, the angle between the axis of the air leakage hole 13 and the axis of the cavity 11 is an acute angle, and the end of the air leakage hole 13 provided outside the cavity 11 is located on the side of the end of the air leakage hole 13 provided in the cavity 11 away from the first opening 14. It can be understood that along the first direction, in the direction from the medium inlet 12 to the first opening 14, the air leakage hole 13 is inclined toward the axis of the cavity 11, and the extension direction of the air leakage hole 13 (refer to the attached Figure 2 The direction b) shown in the figure can match the flow direction of the gas in the cavity 11, improve the gas discharge efficiency, meet the demand for rapid air discharge, accelerate the stabilization of the damping force, and further improve the stability of the timing system.

[0052] It should be noted that the axis of the cavity 11 is along Figure 2 Extends in the up-down direction shown.

[0053] It can be understood that since the exhaust hole on the plunger in the prior art is eliminated, a certain amount of oil can be stored in the cavity 11, which can directly generate an oil pressure reaction force when the engine is restarted, thereby improving the slow pressure building speed in the cavity 11. If the extension direction of the bleed hole is directly perpendicular to the first direction, the liquid level in the cavity can only reach the lower surface of the bleed hole. Once the liquid level is higher than the lower surface of the bleed hole, the oil will flow out directly from the bleed hole. The present invention makes the bleed hole 13 into an inclined hole, so that the liquid level in the cavity 11 can be higher than the lower end of the bleed hole 13, and the oil will not flow out from the bleed hole 13 until the liquid level is higher than the upper end of the bleed hole 13, thereby meeting a greater oil storage demand, further improving the pressure building speed in the cavity 11, improving the effectiveness of the tensioner 100, effectively suppressing chain shaking, avoiding noise generation, and thereby improving cold start NVH performance.

[0054] In some embodiments of the present invention, Figure 2 As shown, the medium inlet 12 and the air bleed hole 13 are respectively located on opposite sides of the cavity 11, which can separate the medium inlet 12 and the air bleed hole 13 as much as possible to avoid interference between the oil flowing into the cavity 11 and the gas being discharged from the cavity 11, thereby ensuring that the oil flows normally from the medium inlet 12 into the cavity 11, ensuring the effectiveness of the tensioner 100, ensuring that the gas is normally discharged from the cavity 11 from the air bleed hole 13, improving the problem of unstable damping force, and improving the stability of the timing system.

[0055] In some embodiments of the present invention, Figure 2 As shown, along the first direction, the cavity 11 includes a first cavity 111 and a second cavity 112 that are connected to each other. The cross-sectional area of the first cavity 111 is smaller than that of the second cavity 112. The medium inlet 12 and the air bleed hole 13 are connected to the first cavity 111. The first open port 14 is provided at the end of the second cavity 112 away from the first cavity 111. The valve 3 is provided at the end of the second cavity 112 close to the first cavity 111. Part of the plunger 2 is provided in the second cavity 112. Since the cross-sectional area of the first cavity 111 is smaller than that of the second cavity 112, the end surface of the valve 3 away from the plunger 2 abuts against a bottom wall of the second cavity 112 close to the first cavity 111, which can limit the valve 3 and prevent the valve 3 from moving in the direction away from the plunger 2, thereby ensuring the effectiveness of the valve 3 in connecting or disconnecting the first cavity 111 and the second cavity 112.

[0056] In some embodiments of the present invention, Figure 3 and attached Figure 4As shown, the valve 3 has an air leakage channel 34 for supplying oil and gas on the side of the valve 3 facing the plunger 2 to the side of the valve 3 facing away from the plunger 2, which can realize reverse leakage of the valve 3, thereby ensuring that the plunger 2 can be moved in the first direction, ensuring that the gas in the cavity 11 flows out from the air leakage hole 13, improving the problem of unstable damping force, and improving the stability of the timing system.

[0057] In a further embodiment of the present invention, referring to the attached Figure 3 and attached Figure 4 As shown, the bleed channel 34 includes a first sub-bleed channel 341 and a second sub-bleed channel 342 which are interconnected. The first sub-bleed channel 341 is located on the outer peripheral wall of the valve 3 and passes through the valve 3 along the first direction. The second sub-bleed channel 342 is provided on the end face of the valve 3 away from the plunger 2. The oil and gas in the second cavity 112 can flow to the first cavity 111 through the first sub-bleed channel 341 and the second sub-bleed channel 342 in sequence, which can realize the reverse leakage of the valve 3, thereby ensuring the mobility of the plunger 2 in the first direction and ensuring that the gas in the cavity 11 flows out from the bleed hole 13, thereby improving the problem of unstable damping force and improving the stability of the timing system.

[0058] In a further embodiment of the present invention, referring to the attached Figure 3 and attached Figure 4 As shown, the second sub-bleed channel 342 includes a first channel 343 and a second channel 344 which are interconnected. The first channel 343 is connected to the first sub-bleed channel 341 and extends in a ring shape along the circumferential direction of the valve 3. The second channel 344 extends along the radial direction of the valve 3. The oil and gas in the second cavity 112 can flow to the first channel 343 through the first sub-bleed channel 341, and flow to the first cavity 111 through the second channel 344, realizing reverse leakage of the valve 3, thereby ensuring that the plunger 2 can be moved in the first direction, ensuring that the gas in the cavity 11 flows out from the bleed hole 13, improving the problem of unstable damping force, and improving the stability of the timing system.

[0059] In a specific example, see the attached Figure 3 As shown, the first sub-air leakage channels 341 are provided on the outer peripheral wall of the valve body 33 and are three spaced apart in the circumferential direction of the valve 3. The three first sub-air leakage channels 341 are all connected to the first channel 343. The first channel 343 and the second channel 344 are both provided on the valve seat 31. The second channels 344 are two spaced apart in the circumferential direction of the valve 3. Both ends of the two second channels 344 in the extension direction are connected to the first channel 343 and the inlet 311, and the two second channels 344 are respectively located on opposite sides of the inlet 311.

[0060] In other embodiments of the present invention, at least a portion of the second sub-leakage channel 342 extends along the circumferential direction of the valve 3. Specifically, the second sub-leakage channel 342 may include an open annular channel and an annular channel. The open annular channel is located radially outside the annular channel, and the two ends of the open annular channel are connected to the first sub-leakage channel 341 and the annular channel respectively. The annular channel is connected to the inlet 311, so that the oil and gas in the second cavity 112 can first flow into the open annular channel through the first sub-leakage channel 341, and then flow to the annular channel along the extension direction of the open annular channel, and finally flow to the inlet 311. This can facilitate the control of the flow of oil and gas from the second cavity 112 to the first cavity 111, achieve reverse leakage of the valve 3, ensure the movement of the plunger 2 in the first direction, ensure that the gas in the cavity 11 flows out from the bleed hole 13, improve the problem of unstable damping force, and improve the stability of the timing system. It should be noted that the open annular structure refers to an annular structure that is not completely closed.

[0061] In some embodiments of the present invention, Figure 2 As shown, the plunger 2 has a third cavity 21, and the side of the third cavity 21 facing the valve 3 has a second opening 22, and the second opening 22 is arranged opposite to the valve 3. The tensioner 100 also includes an elastic member 4, and the elastic member 4 is at least partially arranged in the third cavity 21. The length direction of the elastic member 4 (refer to the attached Figure 2 One end of the plunger 2 (in the up and down directions shown in FIG) abuts against the end of the third cavity 21 away from the second open port 22 , and the other end abuts against the valve 3 , so as to drive the plunger 2 to move in the direction away from the valve 3 .

[0062] It can be understood that the elastic member 4 is always in a compressed state. When the chain moves, due to the crankshaft torsional vibration of the crankshaft, the chain between the camshaft and the crankshaft may easily swing. When this section of the chain moves upward, it will push the plunger 2 upward and compress the elastic member 4. Since the oil in the cavity 11 is incompressible, the tensioner 100 will provide a damping force to counteract the chain and limit the movement of the chain; when the chain moves downward, the elastic member 4 drives the plunger 2 to move in the direction away from the valve 3, so that the plunger 2 contacts the tensioning plate, thereby avoiding chain shaking and maintaining the stability of the timing system.

[0063] It should be noted that at least part of the elastic member 4 is disposed in the third cavity 21, so the third cavity 21 can guide the elastic member 4 to a certain extent, thereby ensuring the stability and reliability of the assembly of the elastic member 4 and preventing the elastic member 4 from shaking in the third cavity 21. Figure 2As shown, one end of the elastic member 4 in the length direction is sleeved on the valve body 33 of the valve 3. The valve body 33 can position the elastic member 4 and guide the elastic member 4 to a certain extent, thereby ensuring the stability and reliability of the assembly of the elastic member 4 and preventing the elastic member 4 from shaking in the third cavity 21.

[0064] In some embodiments of the present invention, Figure 2 As shown, a gap exists between the outer circumferential wall of the plunger 2 and the inner circumferential wall of the housing 1, thereby ensuring normal movement of the plunger 2 in the first direction and ensuring the reliability and stability of the tensioner 100. It should be noted that some of the oil in the second cavity 112 can flow through the gap between the outer circumferential wall of the plunger 2 and the inner circumferential wall of the housing 1 to the first open port 14, and ultimately flow out of the tensioner 100 through the first open port 14.

[0065] In a further embodiment of the present invention, referring to the attached Figure 2 As shown, the outer peripheral wall of the plunger 2 has a slot 23, and the tensioner 100 also includes a retaining spring 5, which is clamped in the slot 23. The retaining spring 5 extends along the circumferential direction of the plunger 2. The retaining spring 5 is used to abut against the housing 1 in the first direction to limit the movement of the plunger 2 toward the valve 3. It can be understood that the retaining spring 5 moves together with the plunger 2 in the first direction. When the retaining spring 5 abuts against the housing 1, the plunger 2 stops moving toward the valve 3 to prevent the plunger 2 from being completely retracted into the second cavity 112, ensuring that the end face of the plunger 2 facing away from the valve 3 is located on the side of the housing 1 facing the chain, ensuring that the plunger 2 abuts against the tensioning plate, can limit the chain shaking, and maintain the stability of the timing system. It should be noted that the retaining spring 5 is elastic. When assembling the slot 23, the retaining spring 5 can be stretched and clamped on the slot 23.

[0066] In a further embodiment of the present invention, referring to the attached Figure 2 As shown, the inner circumferential wall of the housing 1 has a limiting groove 15 extending along the circumferential direction of the housing 1. The retaining spring 5 is movable within the limiting groove 15 in a first direction. It is understood that the retaining spring 5 moves together with the plunger 2 in the first direction. When the retaining spring 5 abuts the inner wall of the limiting groove 15 on the side near the valve 3, the plunger 2 stops moving toward the valve 3, preventing the plunger 2 from being completely retracted into the second cavity 112. This ensures that the end face of the plunger 2 facing away from the valve 3 is located on the side of the housing 1 facing the chain, ensuring that the plunger 2 abuts against the tensioning plate, thereby limiting chain swing and maintaining the stability of the timing system. When the retaining spring 5 abuts the inner wall of the limiting groove 15 on the side facing away from the valve 3, the plunger 2 stops moving in the direction away from the valve 3, preventing the plunger 2 from completely falling out of the second cavity 112, thereby ensuring the reliability and stability of the tensioner 100. It should be noted that the range of movement of the retaining spring 5 depends on the length of the limiting groove 15 in the first direction.

[0067] In a further embodiment of the present invention, Figure 1 and attached Figure 2 As shown, the housing 1 has a through hole 16, which passes through the bottom wall of the limiting groove 15. The outer peripheral wall of the retaining spring 5 has a limiting protrusion 51, which is located in the through hole 16. The cooperation between the limiting protrusion 51 and the through hole 16 can expand the contact area between the retaining spring 5 and the housing 1 when they are in contact, improve the reliability of the cooperation between the retaining spring 5 and the housing 1, and ensure the limiting effect of the retaining spring 5 on the plunger 2. In a specific example, refer to the attached Figure 2 As shown, the clamping spring 5 extends in an open ring shape along the circumferential direction of the plunger 2, and the limiting protrusions 51 are provided on both ends of the extending direction of the clamping spring 5 on the side away from the plunger 2. It should be noted that the open ring shape refers to an incompletely closed ring structure.

[0068] It can be understood that, in the process of the plunger 2 moving along the first direction, the retaining spring 5 moves along the first direction in the limiting groove 15. When the limiting protrusion 51 abuts against the inner wall of the through-hole 16 on the side close to the valve 3, the plunger 2 stops moving toward the valve 3 to avoid the plunger 2 from being completely retracted into the second cavity 112, ensuring that the end face of the plunger 2 facing away from the valve 3 is located on the side of the housing 1 facing the chain, ensuring that the plunger 2 abuts against the tensioning plate, which can limit the chain shaking and maintain the stability of the timing system.

[0069] The present invention also provides an engine having the tensioner 100 according to the above embodiment.

[0070] According to the engine of the embodiment of the present invention, by providing the above-mentioned tensioner 100 and eliminating the exhaust hole on the plunger in the prior art, the cavity formed between the housing 1, the plunger 2 and the valve 3 is a sealed cavity, which can prevent oil from flowing out of the exhaust hole, so that a certain amount of oil can be stored inside the cavity 11, and when the engine is restarted, an oil pressure reaction force can be directly generated, thereby improving the slow pressure build-up speed in the cavity 11, improving the effectiveness of the tensioner 100, effectively suppressing chain shaking, avoiding the generation of noise, and thereby improving the cold start NVH performance.

[0071] The present invention also provides a vehicle having the engine according to the above embodiment.

[0072] According to the vehicle of the embodiment of the present invention, by being provided with the above-mentioned engine, by eliminating the exhaust hole on the plunger in the prior art, the cavity formed between the housing 1, the plunger 2 and the valve 3 is a sealed cavity, which can prevent oil from flowing out of the exhaust hole, so that a certain amount of oil can be stored inside the cavity 11, and can directly generate an oil pressure reaction force when the engine is restarted, thereby improving the slow pressure build-up speed in the cavity 11, improving the effectiveness of the tensioner 100, effectively suppressing chain shaking, avoiding the generation of noise, and thereby improving the cold start NVH performance.

[0073] The tensioner 100 , the engine, and other components and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0074] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A tensioner, characterized in that: include: A housing (1), the housing (1) having a cavity (11) and a medium inlet (12), one end of the cavity (11) being open in a first direction to form a first open port (14), and the medium inlet (12) being in communication with the cavity (11); a plunger (2), the plunger (2) being disposed in the cavity (11) and partially extending from the first opening (14), the plunger (2) being movable along the first direction; A valve (3) is provided in the cavity (11) and between the medium inlet (12) and the plunger (2), and is used to supply oil from the medium inlet (12) to the plunger (2). The cavity formed between the housing (1), the plunger (2) and the valve (3) is a sealed cavity.

2. The tensioner according to claim 1, characterized in that The housing (1) has an air leakage hole (13), which is in communication with the cavity (11) and is located on a side of the valve (3) facing away from the plunger (2).

3. The tensioner according to claim 2, characterized in that The angle between the axis of the air leakage hole (13) and the axis of the cavity (11) is an acute angle, and the end of the air leakage hole (13) located outside the cavity (11) is located on the side of the end of the air leakage hole (13) located inside the cavity (11) that is away from the first opening (14).

4. The tensioner according to claim 2, characterized in that The medium inlet (12) and the air leakage hole (13) are respectively located on two opposite sides of the cavity (11).

5. The tensioner according to claim 1, characterized in that Along the first direction, the cavity (11) comprises a first cavity (111) and a second cavity (112) that are interconnected, the cross-sectional area of the first cavity (111) is smaller than the cross-sectional area of the second cavity (112), the medium inlet (12) is connected to the first cavity (111), the first open port (14) is provided at an end of the second cavity (112) that faces away from the first cavity (111), the valve (3) is provided at an end of the second cavity (112) that is close to the first cavity (111), and a portion of the plunger (2) is provided in the second cavity (112).

6. The tensioner according to claim 1, characterized in that The valve (3) has an air leakage channel (34) for allowing oil and gas on the side of the valve (3) facing the plunger (2) to flow to the side of the valve (3) facing away from the plunger (2).

7. The tensioner according to claim 6, characterized in that The air leakage channel (34) comprises a first sub-air leakage channel (341) and a second sub-air leakage channel (342) which are interconnected. The first sub-air leakage channel (341) is located on the outer peripheral wall of the valve (3) and passes through the valve (3) along the first direction. The second sub-air leakage channel (342) is provided on the end face of the valve (3) facing away from the plunger (2).

8. The tensioner according to claim 7, characterized in that The second sub-degassing channel (342) comprises a first channel (343) and a second channel (344) that are in communication with each other, wherein the first channel (343) is in communication with the first sub-degassing channel (341) and extends in a ring shape along the circumferential direction of the valve (3), and the second channel (344) extends in the radial direction of the valve (3); Alternatively, at least a portion of the second sub-degassing channel (342) extends along the circumferential direction of the valve (3).

9. The tensioner according to claim 1, characterized in that The plunger (2) has a third cavity (21), and a side of the third cavity (21) facing the valve (3) has a second open port (22). The tensioner further comprises: An elastic member (4), wherein the elastic member (4) is at least partially disposed in the third cavity (21), one end of the elastic member (4) in the longitudinal direction abuts against an end of the third cavity (21) away from the second open port (22), and the other end abuts against the valve (3), and is used to drive the plunger (2) to move in a direction away from the valve (3).

10. The tensioner according to claim 1, characterized in that There is a gap between the outer peripheral wall of the plunger (2) and the inner peripheral wall of the housing (1).

11. The tensioner according to claim 10, characterized in that The outer peripheral wall of the plunger (2) has a clamping groove (23), and the tensioner (100) further includes: A retaining spring (5), the retaining spring (5) is disposed in the retaining groove (23), and the retaining spring (5) is used to abut against the housing (1) in the first direction to limit the movement of the plunger (2) toward the valve (3).

12. The tensioner according to claim 11, characterized in that The inner peripheral wall of the housing (1) has a limiting groove (15), and the limiting groove (15) extends along the circumferential direction of the housing (1). Along the first direction, the clamping spring (5) is movable in the limiting groove (15).

13. The tensioner according to claim 12, characterized in that The housing (1) has a through-opening (16), which penetrates the bottom wall of the limiting groove (15); the outer peripheral wall of the retaining spring (5) has a limiting protrusion (51), which is located in the through-opening (16).

14. An engine, characterized in that: Comprising a tensioner (100) according to any one of claims 1-13.

15. A vehicle, characterized in that: Comprising an engine according to claim 14.

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