Shock absorber with bidirectional buffer structure

Abstract

The invention discloses a shock absorber with a bidirectional buffer structure, and relates to the technical field of automobile shock absorbers. The problem that in the prior art, an existing shock absorber cannot effectively restrain impact force generated instantly when a vehicle passes through a concave-convex road surface is solved. The piston rod is arranged in the working cylinder in a sliding mode, the working cylinder is fixedly arranged in the oil storage barrel, a bottom valve system is arranged at the bottom end of the oil storage barrel, an oil seal and a guide seat are arranged at the top end of the oil storage barrel, the free end of the guide seat extends into the working cylinder, a groove is formed in the free end of the guide seat, and the piston rod is provided with a stretching limiting fixing ring. The piston rod stretches to drive the stretching limiting fixing ring to slide into the groove, a first buffer spring seat and a second buffer spring seat which are opposite are axially arranged in the working cylinder in a sleeved mode, and a buffer spring is fixedly connected between the first buffer spring seat and the second buffer spring seat. The shock absorber with the bidirectional buffering structure is installed on the vehicle, the bidirectional buffering structure is adopted, the comfort and safety of the whole vehicle are improved, the service life of the whole vehicle is prolonged, and the overall performance of the whole vehicle is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile shock absorbers, and in particular relates to a shock absorber with a bidirectional buffer structure. Background Art

[0002] In the automobile suspension system, the shock absorber is the core component to ensure the vehicle's driving performance. Its main function is to suppress the vibration after the spring absorbs shock and absorb the impact energy of the road, thereby attenuating the vibration of the frame and body and improving driving smoothness.

[0003] Existing shock absorbers generally rely on internal valve systems to generate damping force. For example, Publication No. CN212616069U discloses an automotive shock absorber assembly. This type of shock absorber structure, which relies on an internal valve system to generate damping force, has significant drawbacks: the damping force of the entire shock absorber varies linearly with the speed of the shock absorber. During actual driving, when a vehicle rapidly passes over a pothole, the tires rapidly drop to their limit position; and when the vehicle rapidly impacts a bumpy surface, the tires rapidly rise to their limit position. In these situations, the impact force exerted on the shock absorber by the uneven surface is enormous, and relying solely on the damping force generated by the valve system is ineffective in effectively suppressing the instantaneous impact force. This not only causes a strong, instantaneous impact on the vehicle body, significantly reducing driver and passenger comfort, but also poses certain safety risks and is prone to noise generation. Furthermore, frequent strong impacts shorten the shock absorber's service life and affect the overall vehicle performance. Summary of the Invention

[0004] The present invention provides a bidirectional buffer structure shock absorber, which dynamically suppresses instantaneous impact through the coordinated action of hydraulic buffering, spring buffering and damping force, thereby improving the comfort, safety, service life and overall performance of the entire vehicle.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The cam is secured in place with an axially extending upper edge of the oil reservoir and is adapted to engage the oil seal of the piston cylinder, the cam extending the upper edge of the oil reservoir and engaging the oil seal of the piston cylinder.

[0007] Furthermore, a first annular groove is circumferentially provided around the outer wall of the piston rod, and a second annular groove is circumferentially provided around the inner wall of the stretch limit fixing ring. A retaining ring is clamped in the first annular groove, a part of the retaining ring is clamped in the first annular groove, and the other part of the retaining ring is clamped in the second annular groove.

[0008] Furthermore, the buffer spring is a compression spring.

[0009] Furthermore, there is a gap between the outer wall of the first buffer spring seat and the inner wall of the working cylinder.

[0010] The beneficial effects of the present invention are:

[0011] The present application provides a bidirectional buffer structure shock absorber installed on a vehicle for shock absorption. A groove is provided at the free end of a guide seat, and a stretching limit fixing ring is provided on the piston rod to cooperate with the groove. During piston rod extension, the stretching limit fixing ring slides into the groove, forming a hydraulic buffer structure on the recovery side. A first buffer spring seat and a second buffer spring seat axially sleeved within the working cylinder, along with a buffer spring fixedly connected between the first and second buffer spring seats, form a buffer spring structure on the compression side. When a vehicle rapidly passes over a pothole-prone road surface and the tire is at its limit of downward movement, the piston rod is at its limit of extension, and the stretching limit fixing ring slides into the groove at the free end of the guide seat, forming a variable throttling gap between the stretching limit fixing ring and the bottom of the groove. The stretching limit fixing ring squeezes the shock-absorbing oil in the groove, and the shock-absorbing oil in the variable throttling gap generates nonlinear hydraulic resistance, which suppresses the impact force when the tire jumps downward, absorbs impact energy, and acts as a buffer. The faster the vehicle, the greater the resistance. When a vehicle quickly impacts a raised road surface and the tire is at the upper limit, the piston rod is at the contraction limit, compressing the buffer spring. The compression and deformation of the buffer spring absorbs the impact energy and avoids hard metal contact, thereby effectively suppressing the impact generated when the tire jumps and playing a buffering role. Under extreme working conditions where the vehicle quickly passes through a pothole road surface or a raised road surface and the tire is at the lower and upper limits, the hydraulic buffer structure and the buffer spring structure can intervene in time and work together to greatly reduce the instantaneous impact force on the vehicle body, significantly improve driving comfort, and reduce safety risks caused by excessive impact; effectively alleviate the impact force under extreme working conditions, reduce damage to the internal components of the shock absorber, thereby extending the service life of the shock absorber and reducing maintenance and replacement costs; eliminate the internal rubber buffer block of the traditional shock absorber, reduce the number of components, simplify the shock absorber structure design, and achieve cost optimization while ensuring performance improvement. In summary, the bidirectional buffer structure shock absorber of the present application adopts a bidirectional buffer structure of a hydraulic buffer structure and a buffer spring structure, which improves the comfort, safety, service life and overall performance of the whole vehicle. The bidirectional buffer structure shock absorber of the present application is suitable for various types of vehicles and different driving conditions, and has strong versatility and market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 is a cross-sectional view of a bidirectional buffer structure shock absorber provided by an embodiment of the present invention;

[0014] Figure 2 yes Figure 1 A partial enlarged view.

[0015] Reference numerals:

[0016] Piston rod 1, oil seal 2, guide seat 3, working cylinder 4, stretching limit fixing ring 5, piston valve system 6, first buffer spring seat 7, buffer spring 8, second buffer spring seat 9, bottom valve system 10, oil storage cylinder 11. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] like Figure 1 、 Figure 2 As shown, this embodiment provides a bidirectional buffer structure shock absorber, including an oil storage cylinder 11, a working cylinder 4, and a piston rod 1. The piston rod 1 is slidably arranged in the working cylinder 4. The bottom end of the piston rod 1 is provided with a piston valve system 6, and the piston valve system 6 is sleeved in the working cylinder 4. The working cylinder 4 is fixedly arranged in the oil storage cylinder 11. The bottom end of the oil storage cylinder 11 is provided with a bottom valve system 10. The top end of the oil storage cylinder 11 is provided with an oil seal 2 and a guide seat 3. The free end of the guide seat 3 extends into the working cylinder 4. The free end of the guide seat 3 is provided The piston rod 1 is provided with a tension-limiting retaining ring 5 that mates with the groove. The groove and tension-limiting retaining ring 5 are positioned opposite each other, and extension of the piston rod 1 drives the tension-limiting retaining ring 5 into the groove. A first and second buffer spring seats 7 and 9 are axially sleeved within the working cylinder 4. These first and second buffer spring seats 7 and 9 are positioned between the piston valve system 6 and the bottom valve system 10. A buffer spring 8 is fixedly connected between the first and second buffer spring seats 7 and 9. The oil seal 2, guide seat 3, working cylinder 4, and bottom valve system 10 are flanged and pressed against the oil reservoir 11 using existing solutions. The oil reservoir 11 is filled with damping oil and nitrogen, while the working cylinder 4 is filled with damping oil. The tension-limiting retaining ring 5 slides into the groove, with the outer wall of the tension-limiting retaining ring 5 providing a clearance fit with the inner wall of the groove. The free end of the guide seat 3 is the other end of the guide seat 3 fixed to the oil reservoir 11. The stiffness of the buffer spring 8 can be selected according to the load requirements of different vehicle models.

[0020] A bidirectional shock absorber with a buffer structure based on the above structure is installed on a vehicle for shock absorption. A groove is provided at the free end of the guide seat 3, and a tension-limiting retaining ring 5 is provided on the piston rod 1 to cooperate with the groove. During extension of the piston rod 1, the tension-limiting retaining ring 5 slides into the groove, forming a hydraulic buffer structure on the recovery side. A first buffer spring seat 7 and a second buffer spring seat 9, axially sleeved within the working cylinder 4, and a buffer spring 8 fixedly connected between the first and second buffer spring seats 7 and 9, form the buffer spring structure on the compression side. When the vehicle rapidly traverses a pothole-like road surface and the tire reaches its limit of downward movement, the piston rod 1 reaches its limit of extension, and the tension-limiting retaining ring 5 slides into the groove at the free end of the guide seat 3. A variable throttling gap is formed between the tension-limiting retaining ring 5 and the bottom of the groove. The tension-limiting retaining ring 5 squeezes the damping oil in the groove. The damping oil in the variable throttling gap generates nonlinear hydraulic resistance, which suppresses the impact force of the tire downward movement, absorbs the impact energy, and acts as a buffer. The resistance increases with increasing speed. When a vehicle quickly impacts a raised road surface and the tire is at the upper limit, the piston rod 1 is at the contraction limit, compressing the buffer spring 8. The buffer spring 8 is compressed and deformed to absorb the impact energy, avoiding hard metal contact, thereby effectively suppressing the impact generated when the tire jumps and playing a buffering role. Under extreme working conditions where the vehicle quickly passes through a pothole road surface or a raised road surface and the tire is at the lower or upper limit, the hydraulic buffer structure and the buffer spring structure can intervene in time and work together to greatly reduce the instantaneous impact force on the vehicle body, significantly improve driving comfort, and reduce safety risks caused by excessive impact; effectively alleviate the impact force under extreme working conditions, reduce damage to the internal components of the shock absorber, thereby extending the service life of the shock absorber and reducing maintenance and replacement costs; eliminate the internal rubber buffer block of the traditional shock absorber, reduce the number of components, simplify the shock absorber structure design, and achieve cost optimization while ensuring performance improvement. In summary, the bidirectional buffer structure shock absorber of the present application adopts a bidirectional buffer structure of a hydraulic buffer structure and a buffer spring structure, which improves the comfort, safety, service life and overall performance of the entire vehicle. The bidirectional buffer structure shock absorber of the present application is suitable for various types of vehicles and different driving conditions, and has strong versatility and market application prospects.

[0021] As an implementable method, Figure 1 、 Figure 2 As shown, a first annular groove is circumferentially provided around the outer wall of the piston rod 1, and a second annular groove is circumferentially provided around the inner wall of the stretch limit fixing ring 5. A retaining ring is clamped in the first annular groove, a part of the retaining ring is clamped in the first annular groove, and the other part of the retaining ring is clamped in the second annular groove.

[0022] The stretching limit fixing ring 5 is sleeved on the piston rod 1, and the second annular groove of the stretching limit fixing ring 5 is clamped on the clamping ring to limit the axial position of the stretching limit fixing ring 5. The stretching limit fixing ring 5 is fixedly installed on the piston rod 1, which is convenient for installation and disassembly of the stretching limit fixing ring 5 and subsequent maintenance and replacement.

[0023] As an implementable method, Figure 1 As shown, the buffer spring 8 is a compression spring.

[0024] The compression spring contracts and deforms under axial pressure to store the spring deformation energy. When the pressure disappears, the stored spring deformation energy is released and the compression spring stretches and resets.

[0025] As an implementable method, Figure 1 As shown, there is a gap between the outer wall of the first buffer spring seat 7 and the inner wall of the working cylinder 4.

[0026] The first buffer spring seat 7 is sleeved in the working cylinder 4 and has clearance fit with the working cylinder 4 , which is beneficial for the reciprocating movement of the first buffer spring seat 7 in the working cylinder 4 .

[0027] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A bidirectional buffer structure shock absorber, comprising an oil storage cylinder (11), a working cylinder (4), and a piston rod (1), wherein the piston rod (1) is slidably arranged in the working cylinder (4), a piston valve system (6) is provided at the bottom end of the piston rod (1), the working cylinder (4) is fixedly arranged in the oil storage cylinder (11), a bottom valve system (10) is provided at the bottom end of the oil storage cylinder (11), and an oil seal (2) and a guide seat (3) are provided at the top end of the oil storage cylinder (11), characterized in that: The free end of the guide seat (3) extends into the working cylinder (4), and the free end of the guide seat (3) is provided with a groove. The piston rod (1) is provided with a stretching limit fixing ring (5) that cooperates with the groove. The groove and the stretching limit fixing ring (5) are arranged relative to each other. The piston rod (1) stretches to drive the stretching limit fixing ring (5) to slide into the groove. The working cylinder (4) is axially sleeved with a first buffer spring seat (7) and a second buffer spring seat (9) that are opposite to each other. The first buffer spring seat (7) and the second buffer spring seat (9) are arranged between the piston valve system (6) and the bottom valve system (10). A buffer spring (8) is fixedly connected between the first buffer spring seat (7) and the second buffer spring seat (9).

2. A bidirectional buffer structure shock absorber according to claim 1, characterized in that: A first annular groove is circumferentially provided around the outer wall of the piston rod (1), and a second annular groove is circumferentially provided around the inner wall of the stretch limit fixing ring (5). A retaining ring is clamped in the first annular groove, with a portion of the retaining ring being clamped in the first annular groove and another portion of the retaining ring being clamped in the second annular groove.

3. The bidirectional buffer structure shock absorber according to claim 1, characterized in that: The buffer spring (8) is a compression spring.

4. The bidirectional buffer structure shock absorber according to claim 1, characterized in that: There is a gap between the outer wall of the first buffer spring seat (7) and the inner wall of the working cylinder (4).

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