Guider structure of automobile shock absorber

Abstract

The invention belongs to the technical field of shock absorber devices, and particularly relates to a guider structure of an automobile shock absorber, which comprises a guide seat, a guide bushing and an oil scraper ring, the through hole comprises a first hole channel used for containing a guide bush, a second hole channel used for containing an oil scraper ring and an isolation part connected with the first hole channel and the second hole channel, the inner diameter of the isolation part is smaller than the inner diameter of the first hole channel and the inner diameter of the second hole channel at the same time, and the oil scraper ring and the guide bush are separated. And the inner diameter of the oil scraping ring is smaller than that of the isolation part. The guider structure is used for solving the technical problems that a guide bush and an oil scraper ring of an existing guider structure are adjacently arranged, when a shock absorber works, a piston rod drives the guide bush to move, the oil scraper ring is extruded and deformed, the piston rod is scratched, oil leakage of the shock absorber is caused, and the service life of the shock absorber is affected.

Description

Technical Field

[0001] The present invention belongs to the technical field of shock absorber devices, and particularly relates to a guide structure for an automotive shock absorber. Background Art

[0002] A shock absorber is a device for accelerating the attenuation of the vibration of the vehicle frame and the body to improve the ride comfort (comfort) of the vehicle. Shock absorbers are installed inside the suspension systems of most vehicles. The structure of a shock absorber is that a piston rod with a piston is inserted into an oil cylinder filled with oil. The piston is provided with throttle holes and valve plates, so that the oil in the two spaces separated by the piston can be replenished with each other, and the damping is generated when the viscous oil passes through the throttle holes. Since the piston moves bidirectionally, valve plates are installed on both sides of the piston, which are called the rebound valve and the circulation valve respectively.

[0003] A guide is a guiding device at the seal of the oil cylinder, which ensures the guiding and bearing of the lateral force of the shock absorber during the movement of the piston rod. An oil scraping ring is usually arranged inside the guide. The main function of the oil scraping ring is to scrape off the excess oil on the piston rod and coat a uniform oil film on the piston rod. However, in the currently used guides, the sliding bearing is arranged adjacent to the oil scraping ring. The reciprocating movement and lateral friction force of the piston rod will drive the sliding bearing inside the guide to move, causing the sliding bearing to squeeze the oil scraping ring and deform. The deformed oil scraping ring is likely to scratch the piston rod and cause the shock absorber to leak oil, affecting the service life of the shock absorber. Summary of the Invention

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the present invention is to provide a guide structure for an automotive shock absorber, which is used to solve the technical problem that in the current guide structure, the guide bushing and the oil scraping ring are arranged adjacent to each other, and the movement of the piston rod driving the guide bushing during the operation of the shock absorber will cause extrusion deformation of the oil scraping ring, scratching the piston rod and causing the shock absorber to leak oil, affecting the service life of the shock absorber.

[0005] To achieve the above purpose, the technical solution of the present invention is: a guide structure for an automotive shock absorber, the guide structure includes a guide seat, a guide bushing and an oil scraping ring. The guide seat is provided with a through hole for the piston rod to pass through. The through hole includes a first hole for accommodating the guide bushing, a second hole for accommodating the oil scraping ring, and an isolation part connecting the first hole and the second hole. The inner diameter of the isolation part is smaller than the inner diameters of both the first hole and the second hole, separating the oil scraping ring and the guide bushing; the inner diameter of the oil scraping ring is smaller than the inner diameter of the isolation part.

[0006] Preferably, a pressure ring is further arranged in the second hole for limiting the oil scraping ring in the second hole.

[0007] Preferably, the cross-section of the pressing ring is in the shape of "「", which is in interference fit with the second channel and is pressed tightly in the guiding seat, and the oil scraping ring is placed in the pressing ring with a clearance fit.

[0008] Preferably, an oil drain groove is provided on the inner wall of the through hole for communicating the spaces above and below the oil scraping ring after the piston rod and the guide are connected.

[0009] Preferably, the oil drain groove includes a first oil drain groove provided on the side wall of the second channel and a second oil drain groove provided on the top surface of the isolation part, and the second oil drain groove is aligned with and communicated with the first oil drain groove.

[0010] Preferably, the guiding bushing is a sliding bearing.

[0011] The beneficial effects of adopting the technical solution of the present invention are as follows: In the present invention, an isolation part is provided between the guiding bushing and the oil scraping ring for isolation. When the guiding bushing moves axially driven by the piston rod, due to the blocking of the isolation part, the oil scraping ring will not be extruded, thus avoiding the deformation of the oil scraping ring caused by extrusion, reducing the situation that the deformed oil scraping ring is likely to scratch the piston rod and cause oil leakage of the shock absorber, and prolonging the service life of the shock absorber. Description of the Drawings

[0012] Figure 1 It is a schematic overall sectional view of an embodiment of a guide structure of an automotive shock absorber; Figure 2 It is a schematic view of a guiding seat of an embodiment of a guide structure of an automotive shock absorber; Figure 3 It is Figure 2 the sectional view of.

[0013] Among them, Figures 1-3 in, 1 - guiding seat, 11 - first channel, 12 - second channel, 13 - isolation part, 2 - guiding bushing, 3 - oil scraping ring, 4 - pressing ring, 5 - oil drain groove, 51 - first oil drain groove, 52 - second oil drain groove. Detailed Embodiments

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments, and do not limit the scope of the present invention.

[0015] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0016] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] The specific embodiments are as follows: As Figures 1-3 shown, a guide structure of an automotive shock absorber, the guide structure includes a guide seat 1, a guide bushing 2, and an oil scraping ring 3. A through hole penetrating up and down is provided on the guide seat 1 for the piston rod of the shock absorber to pass through. The through hole includes a first hole passage 11 provided at the lower part, a second hole passage 12 provided at the upper part, and an isolation part 13 connecting the first hole passage 11 and the second hole passage 12. The isolation part 13 is integrally provided with the guide seat 1, is annular, and the inner diameter is smaller than the pore diameters of the first hole passage 11 and the second hole passage 12.

[0018] The guide bushing 2 is assembled in the first hole passage 11 of the guide seat 1 for the piston rod to pass through. Under the action of the reciprocating movement and lateral friction force of the piston rod, the guide bushing 2 will move axially to a certain extent. The oil scraping ring 3 is assembled in the second hole passage 12 and supported on the isolation part 13. The inner diameter of the oil scraping ring 3 is smaller than the inner diameter of the isolation part so as to hold the piston rod tightly to scrape off the oil on it.

[0019] In this embodiment, the guide seat 1 is made of powder metallurgy material, the oil scraping ring 3 is made of PTFE material, and the guide bushing 2 is made of composite material; the guide bushing 2 and the oil scraping ring are isolated by the hard isolation part 13, and the oil scraping ring will not be extruded when the guide bushing 2 moves axially.

[0020] When the guide structure of an automotive shock absorber in this embodiment is in use, as the vehicle body undulates, the piston rod expands and contracts relative to the oil cylinder. During the expansion and contraction process, the oil scraping ring 3 scrapes off the oil on the piston rod and forms an oil film. The oil scraping ring 3 and the guide bushing 2 are isolated by a hard isolation part 13. Even if the guide bushing 2 moves axially, it will not squeeze the oil scraping ring 3, avoiding the extrusion deformation of the oil scraping ring 3, extending the service life, and thus also reducing the phenomenon of shock absorber oil leakage caused by the scratched piston rod by the deformed oil scraping ring 3, and extending the service life of the shock absorber.

[0021] Further, a pressure ring 4 is also arranged in the second hole 12 for tightly limiting the oil scraping ring 3 in the second hole 12 to prevent the oil scraping ring 3 from moving with the piston rod.

[0022] Further, the cross-section of the pressure ring 4 is in the shape of "「". It is installed in the second hole 12 with an interference fit and presses the oil scraping ring 3 tightly in the guide seat 1 to ensure the reliability of limiting the oil scraping ring 3.

[0023] Further, an oil drain groove 5 is also arranged on the inner wall of the through hole to connect the spaces above and below the oil scraping ring 3, and is used to drain the excess oil above the guide seat 1 back to the storage oil cylinder and discharge the air in the working cylinder.

[0024] Further, the oil drain groove 5 includes a first oil drain groove 51 and a second oil drain groove 52. The first oil drain groove 51 is arranged on the inner wall of the second hole 12, and the second oil drain groove 52 is arranged on the top surface of the isolation part 13. The second oil drain groove 52 is aligned and communicated with the first oil drain groove 51 to realize the communication of the spaces above and below the oil scraping ring 3 after the piston rod is connected to the guide structure.

[0025] Further, the guide bushing 2 is a sliding bearing, which plays a guiding role for the piston rod to ensure the smoothness of the expansion and contraction of the piston rod.

[0026] The above has made an exemplary description of the present invention in combination with the drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A guide structure of an automobile shock absorber, the guide structure comprising a guide seat, a guide bushing and an oil scraper ring, characterized in that: The guide seat is provided with a through hole for the piston rod to pass through, and the through hole includes a first channel for accommodating a guide bushing, a second channel for accommodating an oil scraper ring, and a separating portion connecting the first channel and the second channel, and the inner diameter of the separating portion is smaller than the inner diameters of the first channel and the second channel at the same time, separating the oil scraper ring from the guide bushing; the inner diameter of the oil scraper ring is smaller than the inner diameter of the separating portion.

2. The guide structure of a vehicle shock absorber according to claim 1, characterized in that: A pressure ring is also provided in the second hole channel for limiting the oil scraper ring in the second hole channel.

3. The guide structure of a vehicle shock absorber according to claim 2, characterized in that: The cross section of the pressure ring is in the shape of " ", and is interference fit with the second channel and pressed tightly in the guide seat. The oil scraper ring is placed in the pressure ring with a clearance fit.

4. The guide structure of a vehicle shock absorber according to claim 1, characterized in that: The inner wall of the through hole is provided with an oil drain groove for communicating the space above and below the oil scraper ring after the piston rod and the guide are connected.

5. The guide structure of a vehicle shock absorber according to claim 4, characterized in that: The oil drain groove comprises a first oil drain groove arranged on the side wall of the second channel and a second oil drain groove arranged on the top surface of the isolation portion, and the second oil drain groove is aligned with and communicated with the first oil drain groove.

6. The guide structure of a vehicle shock absorber according to claim 1, characterized in that: The guide bushing adopts a sliding bearing.

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