Sealing guide device

Abstract

The utility model provides a sealing guide device, which has the specific structure that an oil scraper ring is sleeved on a piston rod and is movably connected with the piston rod; the oil scraper ring comprises a first sealing area and a second sealing area which are combined to form the oil scraper ring with an L-shaped section; when the shock absorber is in a compression or recovery stroke, the oil scraper ring moves along with the piston rod, and due to the fact that the first sealing area of the oil scraper ring is movably connected with the guider, no gap is generated between the oil scraper ring and the guider in the compression and recovery process. The top face of a first sealing area in the oil scraper ring can abut against one surface of the inner side of the guider in the recovery stroke, the bottom of a second sealing area in the oil scraper ring can be located in the middle position under the action of friction force and the internal pressure of the shock absorber in the compression stroke, and fixed closure is formed through a throttling groove in the end face of the oil scraper ring. And sealing of the working liquid is achieved when compression and recovery strokes are finished, and the low-speed force value of the shock absorber is stabilized. And the oil scraper ring adopted by the utility model is easier to manufacture.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical engineering, and particularly relates to a sealing and guiding device. Background Art

[0002] A shock absorber, also known as a damper or vibration absorber, is a mechanical device whose main function is to absorb and reduce vibrations, improving the dynamic performance and ride comfort of vehicles, mechanical equipment or buildings. Components such as a piston rod, a guide, an oil scraping ring, and a piston are included in a shock absorber. Among them, the main functions of the oil scraping ring are to bear pressure, protect the oil seal, and ensure damping stability at low speeds. The guide plays a supporting and guiding role. The piston rod is installed inside the guide, and the function of the piston rod is to connect the upper part of the shock absorber and the internal piston to transmit torque.

[0003] In the prior art, the oil scraping ring inside the shock absorber is usually rectangular in design. When the shock absorber is in the compression stroke, especially at low speeds, the pressure in the working chamber of the shock absorber may not be sufficient to overcome the frictional force between the piston rod and the oil scraping ring. This will cause the piston rod to drive the oil scraping ring inside the guide to move downward. Since there is a gap between the oil scraping ring and the guide, there is always a flow leakage channel before contacting the guide bushing, which may lead to pressure leakage, thus affecting the force value performance of the shock absorber at low speeds. Summary of the Utility Model

[0004] The utility model provides a sealing and guiding device to eliminate the flow leakage channel existing between the oil scraping ring and the guide, and improve the force value performance of the shock absorber at low speeds.

[0005] The utility model discloses a sealing and guiding device, including: a guide, an oil scraping ring, a piston rod, and a guide bushing;

[0006] The oil scraping ring is sleeved between the piston rod and the guide and is movably connected to the piston rod;

[0007] The oil scraping ring includes a first sealing area and a second sealing area. After the first sealing area and the second sealing area are combined, an oil scraping ring with an L-shaped cross-section is formed; the diameter of the first sealing area is larger than the diameter of the second sealing area;

[0008] The first sealing area and the guide bushing are movably connected to the guide.

[0009] Further, the oil scraping ring is in interference fit with the piston rod.

[0010] Further, the first sealing area is in interference fit with the guide.

[0011] Further, it further includes: a spring, which is arranged between the oil scraping ring and the guide bushing, or between one surface inside the guide and the oil scraping ring.

[0012] Further, the spring includes a corrugated spring, a cylindrical spring, and a rectangular spring.

[0013] Further, it further includes: a rectangular oil scraping ring; the rectangular oil scraping ring is sleeved on the piston rod, one surface of the rectangular oil scraping ring is movably connected to the piston rod, and the other surface is movably connected to the guide.

[0014] Further, it further includes: a throttling groove, which is arranged on the outer periphery of the first sealing area.

[0015] Further, the throttling groove is symmetrically arranged along the central axis of the oil scraping ring.

[0016] Further, a flow channel is provided on the guide.

[0017] Further, the material of the oil scraping ring is polytetrafluoroethylene.

[0018] Compared with the prior art, the present utility model has at least the following technical effects:

[0019] The oil scraping ring in the present utility model includes a first sealing area and a second sealing area. After the first sealing area and the second sealing area are combined, an oil scraping ring with an L-shaped cross-section is formed; and the diameter of the first sealing area is greater than the diameter of the second sealing area. When the shock absorber performs a compression or recovery stroke, the oil scraping ring moves along with the connecting rod. Since the first sealing area of the oil scraping ring is movably connected to the guide, no gap will be generated between the oil scraping ring and the guide during compression and recovery, improving the low-speed force value of the shock absorber. Moreover, the oil scraping ring adopted by the present utility model has a simple structure and is easier to prepare. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a sealing and guiding device in an embodiment of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the oil scraping ring in a sealing and guiding device in an embodiment of the present utility model;

[0022] Figure 3 It is another schematic structural diagram of a sealing and guiding device in an embodiment of the present utility model. Detailed Embodiments

[0023] The following will describe a sealing and guiding device of the present utility model in conjunction with schematic diagrams, in which the preferred embodiments of the present utility model are shown. It should be understood that those skilled in the art can modify the present utility model described herein while still achieving the advantageous effects of the present utility model. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present utility model.

[0024] In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 cannot be understood as a limitation to the protection scope of the present utility model. The embodiments of the present utility model will be described in detail below with reference to the drawings.

[0026] Please refer to Figures 1-3 , this embodiment provides a sealing and guiding device, including: a guide 3, an oil scraping ring 4, a piston rod 1, and a guide bushing 5.

[0027] The oil scraping ring 4 is sleeved between the piston rod 1 and the guide 3 and is movably connected to the piston rod 1.

[0028] The oil scraping ring 4 includes a first sealing area 41 and a second sealing area 42. After the first sealing area 41 and the second sealing area 42 are combined, an oil scraping ring with an L-shaped cross-section is formed; the diameter of the first sealing area 41 is larger than the diameter of the second sealing area 42.

[0029] The first sealing area 41 and the guide bushing 5 are movably connected to the guide 3.

[0030] In this embodiment, the first sealing area 41 is the sealing area close to the inner surface 300 of the guide 3, and the second sealing area 42 is the sealing area close to the side of the guide bushing 5. The first sealing area 41 is the part of the sealing area with a larger diameter. When the oil scraping ring 4 is sleeved on the guide 3, the first sealing area 41 will have an interference fit with the guide. If a throttling groove is provided on the outer peripheral part of the first sealing area 41, fixed throttling will occur, achieving the effect of a stable damping force.

[0031] It can be understood that the above-mentioned sealing and guiding device is arranged in the shock absorber. The piston rod in the sealing and guiding device makes an axial reciprocating motion, driving the movement of the working fluid. In addition, the shock absorber also includes a lower chamber, which is a working chamber in the shock absorber. It contains a piston, working fluid, as well as valves and holes related to damping performance, and is responsible for storing the oil fluid. When the sealing and guiding device drives the movement of the working fluid, it mobilizes the flow of the working fluid, thereby adjusting the damping force of the shock absorber.

[0032] It can be understood that the shock absorber includes a compression stroke and a rebound stroke. When the shock absorber performs the compression stroke, the piston rod 1 drives the oil scraping ring 4 to move downward, the pressure in the lower chamber increases, the pressure in the upper chamber decreases, the working fluid is compressed, and a small part of the working fluid flows in. When the shock absorber performs the rebound stroke, the piston rod 1 drives the oil scraping ring 4 to move upward, the pressure in the upper chamber increases, the pressure in the lower chamber decreases, and a small part of the working fluid flows into the lower chamber, and the shock absorber returns to its original state.

[0033] In this embodiment, by arranging the oil scraping ring 4 with the above structure in the shock absorber, when the shock absorber performs the compression or rebound stroke, the oil scraping ring moves along with the connecting rod. Since the first sealing area 41 of the oil scraping ring is movably connected to the guide 3, there will be no flow gap between the oil scraping ring and the guide 3 during the compression and rebound processes. Therefore, the working fluid will not flow between the oil scraping ring and the guide 3, improving the low-speed force value of the shock absorber. In addition, the top surface of the first sealing area 41 in the oil scraping ring 4 can abut against a surface 300 inside the guide 3 at the end of the rebound stroke, further preventing the leakage of the working fluid and improving the controllability of the damping force in the shock absorber.

[0034] Furthermore, the oil scraping ring adopted in this embodiment has a simple structure. When performing mechanical processing, only the first sealing area 41 and the second sealing area 42 need to be processed in sequence, or the second sealing area 42 and the first sealing area 41 need to be processed in sequence, then the preparation of the oil scraping ring can be realized, with a lower preparation cost and a higher preparation efficiency.

[0035] In the shock absorber structure provided in this embodiment, the guide bushing 5, the oil scraping ring 4, and the guide 3 are all sleeved on the outer side of the piston rod 1. The oil scraping ring 4 is sleeved in the groove 100 of the guide 3, located between the guide 3 and the piston rod 1. The guide bushing 5 is also sleeved in the groove 100 of the guide 3 and is also located between the guide 3 and the piston rod 1.

[0036] In a specific embodiment, the oil scraping ring 4 has an interference fit with the piston rod 1.

[0037] In another specific embodiment, the first sealing area 41 has an interference fit with the guide 3.

[0038] Furthermore, generally speaking, in order to enable the oil scraping ring 4 to move axially along the piston rod 1, the oil scraping ring 4 needs to be movably connected between the piston rod 1 and the guide 3. The connection method includes the above-mentioned interference fit. However, the interference fit will cause relatively large frictional forces between the oil scraping ring 4 and both the piston rod 1 and the guide 3, increasing the wear of the oil scraping ring 4 and reducing the service life of the oil scraping ring 4. Please refer to Figure 3 , in order to reduce the wear of the oil scraping ring 4, a spring 6 is further provided in the shock absorber in this embodiment. Specifically, the spring 6 is fixed on one surface of the guide bushing 5, located between the oil scraping ring 4 and the guide bushing 5, or fixed on one surface 300 inside the guide 3. When the shock absorber is in the rebound stroke, the oil scraping ring 4 can abut against one surface of the spring 6.

[0039] When the shock absorber is in the compression or rebound stroke, the spring 6 can provide elastic support for the oil scraping ring, enabling the oil scraping ring to reduce the distance of movement along with the piston rod 1, and reducing the frictional forces between the oil scraping ring 4 and the guide 3 as well as the piston rod 1.

[0040] In a specific embodiment, please refer to Figure 3 , the spring 6 can be a wave spring 6, a cylindrical spring 6, or a rectangular spring 6. The installation space of the above-mentioned spring 6 is very small, and it has the functions of reducing noise and vibration, and can reduce the frictional forces between the oil scraping ring 4 and the guide 3 as well as the piston rod 1 on the basis of reducing the overall volume of the device and saving costs. The height of the spring 6 can be set according to the required elastic support force and the specific magnitude of the frictional force.

[0041] Furthermore, in this embodiment, if a spring 6 is provided between the oil scraping ring 4 and the guide bushing 5, a rectangular oil scraping ring 4 can also be used in the shock absorber.

[0042] Specifically, the rectangular oil scraping ring 4 is sleeved on the piston rod 1, with one surface movably connected to the piston rod 1 and the other surface movably connected to the guide 3.

[0043] If the interference fit connection method is adopted between the two surfaces of the rectangular oil scraping ring 4 and the piston rod 1 as well as the guide 3, it will increase the wear of the rectangular oil scraping ring 4 and reduce the service life of the rectangular oil scraping ring 4. However, if a spring 6 is provided between the oil scraping ring 4 and the guide bushing 5, or the spring is fixed on one surface 300 inside the guide 3, the distance of movement of the rectangular sealing ring along with the piston rod 1 can be reduced, thereby reducing the frictional forces between the rectangular oil scraping ring 4 and the guide 3 as well as the piston rod 1, and further stabilizing the low-speed force value.

[0044] In this embodiment, please refer to Figure 2, a throttling groove 7 is further provided on the outer periphery of the first sealing area 41. The number of the throttling grooves 7 can be 1, 2, 3, etc., and no specific limitation is made here. A plurality of throttling grooves 7 are evenly distributed on the outer periphery of the first sealing area 41, and a plurality of openings are formed on the outer periphery of the first sealing area 41 to form a U-shaped throttling groove. The size of the throttling groove 7 can be selected according to the actually allowed flow rate of the working fluid, and the sizes of the plurality of throttling grooves 7 can be set to be the same.

[0045] In a specific embodiment, 2 throttling grooves 7 are provided on the outer periphery of the first sealing area 41, and the 2 throttling grooves 7 are symmetrically arranged along the central axis of the oil scraping ring 4.

[0046] Furthermore, in this embodiment, a flow channel is further opened on the first guide 3. The number of the flow channels can be 1, 2, 3, etc., and no specific limitation is made here. The flow channel is arranged along the radial direction of the guide 3.

[0047] It can be understood that during the compression stroke of the shock absorber, the volume of the lower chamber decreases and the pressure increases. To ensure the pressure balance between the upper and lower chambers and increase the low-speed force value, it is necessary to make a small part of the working fluid flow back to the sealing and guiding device to balance the pressure. In this embodiment, by opening a circulation channel on the guide 3 and opening a throttling groove 7 on the outer periphery of the first sealing area 41, a small part of the working fluid can flow back into the sealing and guiding device when the shock absorber is in the compression stroke, and then flow out of the guide 3 through the throttling groove 7 and the flow channel in sequence, and flow to the outer cylinder, so as to achieve pressure balance and prevent the working fluid from accumulating in the guide 3.

[0048] In this embodiment, the oil scraping ring 4 is made of polytetrafluoroethylene material.

[0049] It can be understood that the polytetrafluoroethylene material is a material with high thermal stability, low friction coefficient, low viscosity, strong wear resistance and low purchase cost. Selecting the polytetrafluoroethylene material as the preparation material of the oil scraping ring 4 can improve the durability and service life of the oil scraping ring 4, reduce the movement loss of the oil scraping ring 4 inside the shock absorber, reduce the sliding friction force, and reduce the possibility of the working fluid adhering to the oil scraping ring 4, and maintain the fluidity of the working fluid and the performance of the shock absorber.

[0050] Preferably, this embodiment further includes an oil seal 2, and the oil seal 2 is sleeved on the piston rod and has an interference fit with the guide 3.

[0051] In summary, by adopting the sealing and guiding device provided in this embodiment, when the shock absorber performs a compression or rebound stroke, the oil scraping ring moves along with the connecting rod. Since the first sealing area of the oil scraping ring is movably connected to the guide, no gap will be generated between the oil scraping ring and the guide during the compression and rebound processes. In addition, the top surface of the first sealing area 41 in the oil scraping ring can abut against a surface 300 inside the guide during the rebound stroke, and the bottom of the second sealing area 42 in the oil scraping ring can be in an intermediate position under the action of friction and the internal pressure of the shock absorber during the compression stroke. A fixed throttling is achieved by relying on the throttling groove 7 on the end face of the oil scraping ring, realizing the sealing of the working fluid at the end of the compression and rebound strokes and stabilizing the low-speed force value of the shock absorber. Moreover, the oil scraping ring adopted in the present utility model simplifies the processing process and reduces the material cost while ensuring the performance.

[0052] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A sealing and guiding device, characterized in that, Comprising: A guide, an oil scraper ring, a piston rod and a guide bushing; The oil scraper ring is sleeved between the piston rod and the guide, and is movably connected to the piston rod; The oil scraper ring includes a first sealing area and a second sealing area. After the first sealing area and the second sealing area are combined, an oil scraper ring with an L-shaped cross-section is formed; the diameter of the first sealing area is larger than the diameter of the second sealing area; The first sealing area and the guide bushing are movably connected to the guide.

2. The sealed guiding device according to claim 1, characterized in that, The oil scraper ring is in interference fit with the piston rod.

3. The sealed guiding device according to claim 1, characterized in that The first sealing area is in interference fit with the guide.

4. The sealed guiding device according to claim 1, wherein, Further comprising: A spring, disposed between the oil scraper ring and the guide bushing, or between one surface inside the guide and the oil scraper ring.

5. The sealing and guiding device according to claim 4, wherein The spring includes a wave spring, a cylindrical spring and a rectangular spring.

6. The sealing and guiding device according to claim 4 or 5, characterized in that, Further comprising: A rectangular oil scraper ring; the rectangular oil scraper ring is sleeved on the piston rod, one surface of the rectangular oil scraper ring is movably connected to the piston rod, and the other surface is movably connected to the guide.

7. The sealed guiding device according to claim 1, wherein Further comprising: A throttling groove, which is disposed on the outer periphery of the first sealing area.

8. The sealing and guiding device according to claim 7, characterized in that The throttling groove is symmetrically disposed along the central axis of the oil scraper ring.

9. The sealing and guiding device according to claim 1, wherein A flow channel is provided on the guide.

10. The sealed guiding device according to claim 1, characterized in that, The material of the oil scraper ring is polytetrafluoroethylene.

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