Hydraulic tensioner

Abstract

The utility model relates to the technical field of automobile parts discloses a hydraulic tensioner, including the casing, the inside of casing is provided with the cavity, the top of cavity is provided with the locking structure, the bottom fixedly connected with pressure structure of cavity, the locking structure includes arc clamping slot, the inside of arc clamping slot is combined with the bolt, one side of arc clamping slot is provided with the clamping spring, the both sides of outer guide post have the inner guide post through the clamping spring and combine, the pressure structure includes spring seat, the bottom of spring seat is provided with the oil tank, the top fixedly connected with guide post spring of spring seat, the one end fixedly connected with outer guide post of guide post spring away from spring seat, in the utility model, utilize the double -guide structure to reduce the risk of radial deviation greatly, ensure that the tensioner motion trajectory straightness deviation range is small, and utilize the clamping spring to limit the inner and outer guide post axial movement, improve the bearing capacity of guide post axial impact load.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a hydraulic tensioner. Background Technology

[0002] With the continuous advancement of automotive technology and industrial development, timing belts in some engines have been replaced by timing chains. During operation, timing chains usually require tensioners to maintain their tension and prevent them from becoming too loose or too long after prolonged use. This reduces engine noise and improves the accuracy and lifespan of the engine.

[0003] Most existing chain tensioners for automotive engines rely solely on the elasticity of springs for tensioning, which all suffer from varying degrees of poor noise reduction and vibration damping effects. Furthermore, the tensioners lack a locking mechanism during assembly, making assembly extremely difficult. Therefore, it is necessary to improve them.

[0004] Therefore, those skilled in the art have provided a hydraulic tensioner to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a hydraulic tensioner. By setting a guide post spring to reduce the stiffness of the guide post during compensation, it ensures that the chain tensioner and the chain maintain a suitable interaction force, reducing engine chain vibration and noise. Before assembly, the guide post can be locked by inserting a pin into the pin hole. After assembly, the pin can be pulled out to hold the chain in place, ensuring stable tensioning movement and simplifying assembly.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A hydraulic tensioner includes a housing, the interior of which is provided with a cavity, a locking structure is provided at the top of the cavity, and a pressure structure is fixedly connected to the bottom of the cavity; The locking structure includes an arc-shaped groove located at the top of the housing. A pin is engaged inside the arc-shaped groove. A retaining spring is provided on one side of the arc-shaped groove. Inner guide posts are engaged on both sides of the outer guide post by retaining springs. The bottom of the inner guide post is fixedly connected to a spring seat. By using the above technical solution, a locking structure is set up, and the pin is inserted into the arc-shaped slot to lock the outer guide post, and the outer guide post and inner guide post are limited by the snap ring.

[0007] Furthermore, the pressure structure includes a spring seat located inside the cavity, a pressure spring fixedly connected inside the spring seat, a steel ball fixedly connected to the end of the pressure spring away from the spring seat, an oil tank provided at the bottom of the steel ball, a guide post spring fixedly connected to the top of the spring seat, and an outer guide post fixedly connected to the end of the guide post spring away from the spring seat. By implementing the above technical solution, a pressure structure is set up. After removing the pin, the outer guide post extends upward under the force of the guide post spring. Hydraulic oil enters the high-pressure chamber of the tensioner assembly from the oil tank. The oil pressure in the high-pressure chamber is equal to that in the low-pressure chamber. The tensioning force of the tensioner is the sum of the oil pressure and the spring force. When the outer guide post is compressed, the pressure spring compresses downward. The oil in the high-pressure chamber is in a compressed state. Due to the low compressibility of the oil, a large damping is formed. Consequently, during the back pressure process, the outer guide post has a large damping, reducing the amplitude of the timing chain and transmission noise, thereby providing stable tension.

[0008] Furthermore, a spring pin is fixedly connected to the bottom of the outer guide post, and a guide post spring is sleeved on the outside of the spring pin; The above technical solution utilizes a spring-loaded pin to transmit spring pressure to the end face of the guide post, directly contacting the transmission components to apply tension.

[0009] Furthermore, a housing positioning sleeve is provided at both ends of the housing, a mounting bracket is fixedly connected to one side of the housing, a mounting base is provided at the bottom of the mounting bracket, and the bottom of the mounting base is fixedly connected to the housing; The above technical solution utilizes multiple fixing methods, including the housing positioning sleeve, mounting bracket, and mounting base, to achieve precise positioning and enhance the stability of the tensioner.

[0010] Furthermore, the material of the latch is plastic; The above technical solution uses a plastic pin and a lightweight tensioner, which significantly reduces weight and energy consumption, and also has certain corrosion resistance, shock absorption and noise reduction functions.

[0011] This utility model has the following beneficial effects: This utility model proposes a hydraulic tensioner that, by setting an outer guide post and an inner guide post, and using a retaining spring for limiting, significantly reduces the risk of radial offset and ensures a small deviation range in the straightness of the tensioner's movement trajectory. The retaining spring is embedded in the groove at the end of the guide post to limit the axial movement of the inner and outer guide posts, improving the axial impact load bearing capacity of the guide posts. A pressure structure is set up, using a guide post spring to reduce the stiffness of the guide post during compensation, ensuring that the chain tensioner and the chain maintain a suitable interaction force, reducing engine chain vibration and noise. A locking structure is set up, where a pin is inserted into the arc-shaped groove before assembly to lock the guide post, and the pin is pulled out after assembly to hold the chain in place, ensuring stable tensioning movement and simplifying assembly. Attached Figure Description

[0012] Figure 1 This is a perspective view of a hydraulic tensioner proposed in this utility model; Figure 2 This is an internal structural diagram of a hydraulic tensioner proposed in this utility model; Figure 3 This is a schematic diagram of the structure of a hydraulic tensioner proposed in this utility model; Figure 4 This is a top view of a hydraulic tensioner proposed in this utility model; Figure 5 This is a cross-sectional view of a hydraulic tensioner proposed in this utility model.

[0013] Legend: 1. Housing; 2. Locking structure; 201. Arc-shaped groove; 202. Snap ring; 203. Pin; 3. Outer guide post; 4. Housing positioning sleeve; 5. Inner guide post; 6. Pressure structure; 601. Spring seat; 602. Oil tank; 603. Steel ball; 604. Pressure spring; 7. Guide post spring; 8. Cavity; 9. Spring pin; 10. Mounting bracket; 11. Mounting base. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Reference Figures 1-5 One specific embodiment provided by this utility model: A hydraulic tensioner includes a housing 1 with an internal cavity 8. A locking structure 2 is located at the top of the cavity 8, and a pressure structure 6 is fixedly connected to the bottom of the cavity 8. The locking structure 2 includes an arc-shaped groove 201 located at the top of the housing 1. A pin 203 is engaged inside the arc-shaped groove 201, and a retaining spring 202 is located on one side of the arc-shaped groove 201. Inner guide posts 5 are engaged on both sides of an outer guide post 3 via the retaining springs 202. The bottom of the inner guide post 5 is fixedly connected to a spring seat 601. By inserting the pin 203 into the arc-shaped groove 201, the outer guide post 3 can be locked, and the retaining springs 202 limit the movement of the outer guide post 3 and the inner guide post 5. A spring pin 9 is fixedly connected to the bottom of the outer guide post 3. A guide post spring 7 is sleeved on the outside of the spring pin 9. The spring pin 9 transmits spring pressure to the end face of the guide post, directly contacting the transmission component to apply tension. The pressure structure 6 includes a spring seat 601, which is located inside the cavity 8. A pressure spring 604 is fixedly connected inside the spring seat 601. The end of the pressure spring 604 away from the spring seat 601 is fixedly connected to a steel ball 603. An oil tank 602 is provided at the bottom of the steel ball 603. A guide post spring 7 is fixedly connected to the top of the spring seat 601. An outer guide post 3 is fixedly connected to the end of the guide post spring 7 away from the spring seat 601. With the pressure structure 6 set, when the pin 203 is pulled out, the outer guide post 3 extends upward under the force of the guide post spring 7. Hydraulic oil enters the high-pressure chamber of the tensioner assembly from the oil tank 602. The oil pressure in the high-pressure chamber is equal to that in the low-pressure chamber. The tensioning force of the tensioner is the sum of the oil pressure and the spring force. When the outer guide post 3 is compressed, the pressure spring 604 is compressed downwards, and the oil in the high-pressure chamber is in a compressed state. Due to the low compressibility of the oil, a large damping is formed. As a result, during the back pressure process, the outer guide post 3 has a large damping, which reduces the amplitude of the timing chain and the transmission noise, thereby providing stable tension. Both ends of the housing 1 are provided with housing positioning sleeves 4. One side of the housing 1 is fixedly connected to a mounting bracket 10. The bottom of the mounting bracket 10 is provided with a mounting seat 11. The bottom of the mounting seat 11 is fixedly connected to the housing 1. Multiple fixation is achieved by using the housing positioning sleeves 4, the mounting bracket 10, and the mounting seat 11 to accurately position and enhance the stability of the tensioner. The pin 203 is made of plastic. Using a plastic pin 203 makes the tensioner lightweight, significantly reducing weight and energy consumption, and also has certain corrosion resistance and shock absorption and noise reduction functions.

[0016] Working principle: When using this hydraulic tensioner, install the tensioner on one side of the chain, pull out the tensioner pin 203 from inside the arc-shaped slot 201, so that the outer guide post 3 presses against the chain under the force of the guide post spring 7. At this time, hydraulic oil enters the high-pressure chamber of the tensioner assembly from the oil tank 602. The oil pressure in the high-pressure chamber is equal to that in the low-pressure chamber. The tensioning force of the tensioner is the sum of the oil pressure and the spring force. When the outer guide post 3 is compressed, the pressure spring 604 compresses downward, and the oil in the high-pressure chamber is in a compressed state. Due to the low compressibility of the oil, a large damping is formed. Therefore, during the back pressure process, the outer guide post 3 has a large damping, which reduces the amplitude of the timing chain and the transmission noise, thereby providing stable tension. When disassembly is required, release the fixing of the mounting bracket 10 and the mounting base 11, insert the pin 203 back into the arc-shaped slot 201, so that the outer guide post 3 is locked, making assembly convenient.

[0017] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic tensioner, comprising a housing (1), characterized in that: The housing (1) has an internal cavity (8), the top of the cavity (8) has a locking structure (2), and the bottom of the cavity (8) is fixedly connected to a pressure structure (6). The locking structure (2) includes an arc-shaped slot (201), which is located at the top of the housing (1). A pin (203) is engaged inside the arc-shaped slot (201), and a retaining spring (202) is provided on one side of the arc-shaped slot (201).

2. The hydraulic tensioner according to claim 1, characterized in that: The pressure structure (6) includes a spring seat (601) located inside the cavity (8). A pressure spring (604) is fixedly connected inside the spring seat (601). One end of the pressure spring (604) away from the spring seat (601) is fixedly connected to a steel ball (603). An oil tank (602) is provided at the bottom of the steel ball (603).

3. A hydraulic tensioner according to claim 2, characterized in that: A guide post spring (7) is fixedly connected to the top of the spring seat (601), and an outer guide post (3) is fixedly connected to the end of the guide post spring (7) away from the spring seat (601).

4. A hydraulic tensioner according to claim 3, characterized in that: The outer guide post (3) is engaged with the inner guide post (5) on both sides by snap rings (202), and the bottom of the inner guide post (5) is fixedly connected to the spring seat (601).

5. A hydraulic tensioner according to claim 3, characterized in that: The bottom of the outer guide post (3) is fixedly connected to a spring pin (9), and a guide post spring (7) is sleeved on the outside of the spring pin (9).

6. A hydraulic tensioner according to claim 1, characterized in that: Both ends of the housing (1) are provided with housing positioning sleeves (4).

7. A hydraulic tensioner according to claim 1, characterized in that: A mounting bracket (10) is fixedly connected to one side of the housing (1), and a mounting seat (11) is provided at the bottom of the mounting bracket (10). The bottom of the mounting seat (11) is fixedly connected to the housing (1).

8. A hydraulic tensioner according to claim 1, characterized in that: The pin (203) is made of plastic.

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