Engine and hydraulic tensioner thereof

Abstract

The hydraulic tensioner comprises a shell, a plunger, a ratchet lock clamp and a vibration reduction layer, the shell is arranged on the periphery of the plunger in a sleeved mode, the plunger is in sliding fit with the shell, the first end of the plunger is located in an inner cavity of the shell, and the second end of the plunger is located outside the shell. The ratchet lock clamp is installed at the second end of the plunger and located outside the shell. When the shell is knocked by the ratchet lock clamp, the ratchet lock clamp and the shell are separated through the vibration reduction layer. According to the hydraulic tensioner of the engine, the ratchet lock clamp and the shell are spaced through the vibration reduction layer, when the plunger drives the ratchet lock clamp to move in the direction close to the shell to knock the shell, the ratchet lock clamp knocks the shell through the vibration reduction layer, vibration transmitted to the shell from the ratchet lock clamp is reduced, and therefore noise of the engine is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, in particular to an engine and a hydraulic tensioner thereof. Background Art

[0002] As a key component of the timing chain drive system, the hydraulic tensioner plays a vital role in maintaining stable chain operation. The timing chain system is primarily responsible for driving the engine's valvetrain, ensuring the appropriate opening and closing of the intake and exhaust valves, thereby maintaining normal engine operation. During operation, the hydraulic tensioner automatically adjusts and maintains chain tension through hydraulic pressure, ensuring stable operation.

[0003] When the engine is just started, due to the delay in oil supply, the high-pressure chamber of the hydraulic tensioner is in a short oil-free state. At this time, the spring force of the hydraulic tensioner is not enough to balance the reaction force of the tensioning guide rail on the plunger, causing the plunger to have a large displacement, resulting in the ratchet lock clamp and the plunger housing to knock, which makes the engine noisy.

[0004] Therefore, how to reduce the noise of the engine is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The purpose of the present invention is to provide a hydraulic tensioner for an engine to reduce the noise of the engine. Another purpose of the present invention is to provide an engine comprising the hydraulic tensioner.

[0006] The hydraulic tensioner of the engine provided by this application includes:

[0007] case;

[0008] The plunger is provided with a housing sleeved around the outer periphery of the plunger, the plunger and the housing are slidably matched, the first end of the plunger is located in the inner cavity of the housing, and the second end of the plunger is located outside the housing;

[0009] a ratchet lock clip mounted on the second end of the plunger and located outside the housing;

[0010] A vibration-damping layer is provided, wherein when the ratchet locking clip strikes the shell, the ratchet locking clip and the shell are spaced apart by the vibration-damping layer.

[0011] Optionally, in the hydraulic tensioner of the engine, the vibration damping layer includes a first vibration damping layer provided at the end of the shell.

[0012] Optionally, in the hydraulic tensioner of the engine described above, the first vibration-damping layer is a damping member vulcanized on the end of the housing.

[0013] Optionally, in the hydraulic tensioner of the engine, the first vibration-damping layer is arranged in a ring shape around the opening position of the shell.

[0014] Optionally, in the hydraulic tensioner of the above-mentioned engine, a slot is provided at the end of the shell, and the first vibration-damping layer is provided with a limiting protrusion that is engaged with the slot, and the limiting protrusion is located at the end of the first vibration-damping layer away from the ratchet lock clamp.

[0015] Optionally, in the hydraulic tensioner of the engine, the vibration damping layer includes a second vibration damping layer provided on the ratchet lock clamp.

[0016] Optionally, in the hydraulic tensioner of the engine, the second vibration damping layer is sleeved on the outer periphery of the ratchet lock clamp.

[0017] Optionally, in the hydraulic tensioner of the engine, the vibration damping layer is a silicone pad or a rubber pad.

[0018] Optionally, the hydraulic tensioner of the above-mentioned engine further includes a plunger spring, wherein the plunger spring sleeve is arranged on the central column inside the plunger, and one end of the plunger spring is connected to the plunger, and the other end is connected to the bottom end of the inner cavity of the shell.

[0019] An engine includes a hydraulic tensioner, wherein the hydraulic tensioner is any one of the hydraulic tensioners described above.

[0020] In the above technical solution, the hydraulic tensioner of the engine provided by the utility model includes a housing, a plunger, a ratchet lock clamp and a vibration damping layer. The housing is sleeved on the outer periphery of the plunger, and the plunger is slidably matched with the housing. The first end of the plunger is located in the inner cavity of the housing, and the second end of the plunger is located outside the housing. The ratchet lock clamp is installed on the second end of the plunger and is located outside the housing. When the ratchet lock clamp hits the housing, the ratchet lock clamp and the housing are separated by the vibration damping layer. When the engine is just started, due to the delay in oil supply, the high-pressure chamber of the hydraulic tensioner is in a short oil-free state. At this time, the plunger spring force is not enough to balance the reaction force of the tensioning guide rail on the plunger, thereby causing the plunger to produce a large displacement. At this time, the ratchet lock clamp moves toward the housing, and at this time, the ratchet lock clamp hits the housing through the vibration damping layer.

[0021] From the above description, it can be seen that in the hydraulic tensioner of the engine provided in this application, the ratchet lock clamp and the housing are separated by a vibration-damping layer. When the plunger drives the ratchet lock clamp to move toward the housing and then strikes the housing, the ratchet lock clamp strikes the housing through the vibration-damping layer, thereby reducing the vibration transmitted from the ratchet lock clamp to the housing, thereby reducing the noise of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 This is a structural schematic diagram of the hydraulic tensioner provided in an embodiment of the utility model.

[0024] in Figure 1 Center: 1- plunger spring, 2- housing, 3- first vibration damping layer, 4- plunger, 5- ratchet lock clamp, 6- inner cavity, 7- center column. DETAILED DESCRIPTION

[0025] The core of the present invention is to provide a hydraulic tensioner for an engine to reduce the noise of the engine. Another core of the present invention is to provide an engine comprising the hydraulic tensioner.

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and implementation methods.

[0027] Please refer to Figure 1 In a specific embodiment, the hydraulic tensioner of the engine provided by the specific embodiment of the utility model includes a housing 2, a plunger 4, a ratchet lock clamp 5 and a vibration damping layer, wherein the vibration damping layer can be a silicone pad, a rubber pad or a sponge pad.

[0028] The housing 2 is sleeved around the periphery of the plunger 4 and defines an inner cavity 6. The plunger 4 and the housing 2 are slidably engaged, with the first end of the plunger 4 located within the inner cavity 6 of the housing 2 and the second end of the plunger 4 located outside the housing 2. A ratchet lock clip 5 is mounted on the second end of the plunger 4 and located outside the housing 2, with the first and second ends being opposite ends in the sliding direction of the plunger 4.

[0029] When the ratchet clip 5 strikes the housing 2, a vibration-damping layer separates the ratchet clip 5 and the housing 2. The vibration-damping layer can be located on either the ratchet clip 5 or the housing 2. Alternatively, when the ratchet clip 5 is isolated from the housing 2, the vibration-damping layer is isolated from both the ratchet clip 5 and the housing 2. The vibration-damping layer is located on an external support member fixed relative to the housing 2. Only when the ratchet clip 5 strikes the housing 2 does the ratchet clip 5 push the vibration-damping layer toward the housing 2. When the ratchet clip 5 moves away from the housing 2, the vibration-damping layer returns to its original position under its own weight, becoming isolated from the housing 2.

[0030] When the engine is just started, due to the delay in oil supply, the high-pressure chamber of the hydraulic tensioner is in a short oil-free state. At this time, the force of the spring 1 of the plunger 4 is not enough to balance the reaction force of the tensioning guide rail on the plunger 4, causing the plunger 4 to produce a large displacement. At this time, the ratchet lock clamp 5 moves toward the direction close to the housing 2. At this time, the ratchet lock clamp 5 knocks the housing 2 through the vibration damping layer.

[0031] As can be seen from the above description, in the hydraulic tensioner for an engine provided in the specific embodiment of this application, the ratchet clamp 5 and the housing 2 are separated by a vibration-damping layer. When the plunger 4 drives the ratchet clamp 5 toward the housing 2 and the ratchet clamp 5 strikes the housing 2 through the vibration-damping layer, the vibration-damping layer further reduces the vibration transmitted from the ratchet clamp 5 to the housing 2. In other words, by improving the transmission path of the striking excitation, the vibration response is reduced, thereby achieving the purpose of reducing engine noise.

[0032] In one embodiment, the vibration damping layer includes a first vibration damping layer 3 disposed at an end of the housing 2. Specifically, the first vibration damping layer 3 is fixed to the outer periphery of the housing 2 by fasteners. A plurality of first vibration damping layers 3 may be sequentially disposed along the outer periphery of the housing 2 in the direction of the opening.

[0033] Alternatively, the first vibration-damping layer 3 may be arranged in a ring shape around the opening of the shell 2 . In this case, there is only one first vibration-damping layer 3 , which is sleeved on the outer periphery of the opening of the shell 2 .

[0034] In a specific embodiment, the first vibration damping layer 3 can also be a damping member vulcanized at the end of the shell 2, wherein the thickness of the damping member along the movement direction of the plunger 4 is determined according to needs, and this application does not make specific limitations. In this case, there is no need to set up a separate structure to fix the first vibration damping layer 3, thereby improving assembly efficiency.

[0035] In one specific embodiment, to improve the connection stability of the first vibration-damping layer 3, a slot is preferably provided at the end of the housing 2, and a limiting protrusion is provided on the first vibration-damping layer 3. The limiting protrusion is engaged with the slot, wherein the limiting protrusion is located at the end of the first vibration-damping layer 3 away from the ratchet lock clamp 5. Specifically, multiple limiting protrusions can be provided, in which case multiple limiting slots can also be provided, with the limiting protrusions engaging with the slots one-to-one. Alternatively, the limiting protrusions can be arranged in an annular shape around the opening of the housing 2, in which case the slot also has an annular structure.

[0036] In another specific embodiment, the vibration damping layer includes a second vibration damping layer provided on the ratchet lock clamp 5. Specifically, the second vibration damping layer can be vulcanized on the damping element of the ratchet lock clamp 5.

[0037] In order to improve the connection stability of the second vibration damping layer, preferably, the second vibration damping layer is sleeved on the outer periphery of the ratchet lock clamp 5. Specifically, the second vibration damping layer can be a silicone tube or a rubber tube.

[0038] Of course, in specific configuration, a second vibration-damping layer may be provided on the ratchet lock clamp 5 , while a first vibration-damping layer 3 may be provided on the housing 2 .

[0039] In addition to the above solutions, the hydraulic tensioner further includes a plunger spring 1, which is sleeved onto a center post 7 within the plunger 4. One end of the plunger spring 1 is connected to the plunger 4, and the other end is connected to the bottom end of the inner cavity 6 of the housing 2. The outer shell of the plunger 4 is fixedly connected to the center post 7, which is located inside the outer shell.

[0040] The present application provides an engine including a hydraulic tensioner, wherein the hydraulic tensioner is any of the above-mentioned hydraulic tensioners. The above description of the specific structure of the hydraulic tensioner also has the above-mentioned technical effects.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic tensioner for an engine, characterized in that: include: housing (2); A plunger (4), the housing (2) is sleeved on the outer periphery of the plunger (4), the plunger (4) and the housing (2) are slidably matched, the first end of the plunger (4) is located in the inner cavity (6) of the housing (2), and the second end of the plunger (4) is located outside the housing (2); a ratchet lock clamp (5), the ratchet lock clamp (5) being mounted on the second end of the plunger (4) and located outside the housing (2); A vibration damping layer, wherein when the ratchet lock clamp (5) strikes the shell (2), the ratchet lock clamp (5) and the shell (2) are separated by the vibration damping layer.

2. The hydraulic tensioner of the engine according to claim 1, characterized in that: The vibration damping layer comprises a first vibration damping layer (3) arranged at the end of the shell (2).

3. The hydraulic tensioner of the engine according to claim 2, characterized in that: The first vibration damping layer (3) is a damping component vulcanized on the end of the shell (2).

4. The hydraulic tensioner of the engine according to claim 2, characterized in that: The first vibration damping layer (3) is arranged in a ring shape around the opening position of the shell (2).

5. The hydraulic tensioner of the engine according to claim 2, characterized in that: The housing (2) has a slot at its end, and the first vibration-damping layer (3) has a limiting protrusion that is engaged with the slot. The limiting protrusion is located at an end of the first vibration-damping layer (3) that is away from the ratchet lock clamp (5).

6. The hydraulic tensioner of an engine according to claim 1, characterized in that: The vibration damping layer comprises a second vibration damping layer provided on the ratchet lock clamp (5).

7. The hydraulic tensioner of the engine according to claim 6, characterized in that: The second vibration damping layer is sleeved on the outer periphery of the ratchet lock clamp (5).

8. The hydraulic tensioner of an engine according to claim 1, characterized in that: The vibration-damping layer is a silica gel pad or a rubber pad.

9. The hydraulic tensioner for an engine according to any one of claims 1 to 8, characterized in that: It also includes a plunger spring (1), which is sleeved on a central column (7) in the plunger (4), and one end of the plunger spring (1) is connected to the plunger (4), and the other end is connected to the bottom end of the inner cavity (6) of the housing (2).

10. An engine comprising a hydraulic tensioner, characterized in that: The hydraulic tensioner is the hydraulic tensioner according to any one of claims 1 to 9.

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