A piston rod assembly for a motor vehicle shock absorber having a multi-stage damping function
By designing a multi-stage buffer structure and controlling oil flow, the problem of insufficient buffering capacity of traditional shock absorbers has been solved, achieving precise response to different vibrations and improved comfort.
Patent Information
- Application Number
- CN202521641939.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-04
AI Technical Summary
Traditional automotive shock absorber piston rod assemblies have limited damping capacity and cannot effectively cope with vibrations of varying intensities, affecting in-vehicle comfort and shock absorber lifespan.
Design a piston rod assembly for an automotive shock absorber with multi-stage buffering function. The assembly consists of first and second damping springs and hydraulic damping, forming a multi-stage buffering system. The oil flow is precisely controlled by an opening and closing mechanism to achieve multi-stage buffering and damping adjustment.
It improves shock absorption efficiency, can accurately cope with vibrations and impacts of different intensities, reduces vehicle body bumps, and improves ride comfort and shock absorber adaptability.
Smart Images
Figure CN224679970U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of automobile shock absorber, specifically is a kind of automobile shock absorber piston rod assembly with multistage buffering function. BACKGROUND
[0002] In the field of automobile industry, the driving comfort and the control stability of vehicle have been the important performance indicators. During driving, the vehicle will inevitably encounter various road conditions, such as potholes, bumps, speed bumps, etc. These uneven road surfaces will cause the vibration of the vehicle. As a key component of the automobile suspension system, the main function of the shock absorber is to absorb and buffer these vibrations, reduce the jolt and sway of the vehicle body, thereby improving the comfort of the driver and passenger, and ensuring the good contact between the tire and the road, and the control performance and driving safety of the vehicle.
[0003] The conventional automobile shock absorber piston rod assembly usually adopts a single buffering structure, and its buffering capacity is relatively limited. When facing slight vibration, it may not fully play the buffering role, resulting in that the occupants can still feel obvious jolt; while when encountering larger vibration, the single buffering structure may not timely and effectively disperse and absorb energy, so that the shock absorber reaches the limit working state, which not only affects the damping effect, but also may shorten the service life of the shock absorber. SUMMARY
[0004] The utility model aims at providing a kind of automobile shock absorber piston rod assembly with multistage buffering function to solve the problems raised in the above background.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of automobile shock absorber piston rod assembly with multistage buffering function, including outer tube, the inner tube is fixedly connected on the top of the inner wall of outer tube, oil cavity is formed between the outer tube and the inner tube, the outer tube top is fixedly connected with sealing block, the piston rod is arranged on the top of the sealing block, the piston is fixedly connected to the bottom end of the piston rod, the buffer mechanism is arranged on the inner wall of the inner tube, the opening and closing mechanism is fixedly connected on the inner wall of the inner tube near the bottom;
[0006] The buffer mechanism includes a fixed ring, the fixed ring is fixedly connected to the inner wall of the inner tube near the top, the top of the fixed ring is circularly equidistantly arrayed and fixedly connected with guide rod, the guide rod is slidably connected with sliding ring, the top end of the guide rod is fixedly connected with limit ring, the first damping spring is sleeved between the fixed ring and the sliding ring on the surface of the guide rod, the top of the fixed ring is circularly equidistantly arrayed and fixedly connected with damping rod, the outer tube top is fixedly connected with first fixed disc, the second fixed disc is fixedly connected on the surface of the piston rod near the top end, the second damping spring is sleeved between the first fixed disc and the second fixed disc on the surface of the piston rod.
[0007] Preferably, the oil cavity is triangular, the sealing block top is provided with a hole matched with the piston rod, and the piston rod surface penetrates and is connected to the hole in a sliding manner, and the piston surface is connected to the inner wall of the inner cylinder in a sliding manner.
[0008] Preferably, the sliding ring inner wall is fixedly connected to the piston rod surface, the first damping spring bottom end is fixedly connected to the fixed ring top, and the first damping spring top end is fixedly connected to the sliding ring bottom.
[0009] Preferably, the sliding ring inner diameter and the limiting ring inner diameter are greater than the diameter of the piston rod, the second damping spring bottom end is fixedly connected to the first fixed disc top, and the second damping spring top end is fixedly connected to the second fixed disc bottom.
[0010] Preferably, the opening and closing mechanism comprises a fixed seat, the fixed seat is fixedly connected to the inner wall of the inner cylinder close to the bottom, the fixed seat top is fixedly connected with a fixed rod, the fixed rod top is fixedly connected with a first fixed plate, the fixed rod surface is slidably connected with a first pressing plate, the fixed rod surface is sleeved with a first spring between the first fixed plate and the first pressing plate, the fixed seat top is provided with a first oil hole close to the edge, the fixed rod bottom is fixedly connected with a second fixed plate, the fixed rod surface is slidably connected with a second pressing plate, the fixed rod surface is sleeved with a second spring between the second fixed plate and the second pressing plate, the fixed seat top is provided with a second oil hole, and the inner wall of the inner cylinder bottom is provided with a third oil hole.
[0011] Preferably, the fixed seat top is provided with a hole matched with the fixed rod, and the fixed rod surface penetrates and is fixedly connected to the hole, the fixed rod bottom is located below the fixed seat, the first spring top end is fixedly connected to the first fixed plate bottom, the first spring bottom end is fixedly connected to the first pressing plate top, and the first pressing plate is shielded from the first oil hole by the elastic force of the first spring.
[0012] Preferably, the first pressing plate top is provided with a hole corresponding to the second oil hole, the second spring bottom end is fixedly connected to the second fixed plate top, the second spring top end is fixedly connected to the second pressing plate bottom, and the second pressing plate is shielded from the second oil hole by the elastic force of the spring.
[0013] Compared with the prior art, the automobile shock absorber piston rod assembly with multi-stage buffering function has the following beneficial effects:
[0014] 1. The automobile shock absorber piston rod assembly with multi-stage buffering function, through the first damping spring and the second damping spring arranged by the buffering mechanism, in combination with the hydraulic damping formed by the piston and the inner cylinder, a multi-stage buffering system is formed. During vehicle driving, the road impact force is first preliminarily buffered by the second damping spring, and the piston rod descending speed is slowed down; when the impact force increases, the first damping spring is further compressed by the sliding ring, and the damping force generated by the damping rod is matched to weaken the vibration energy layer by layer, greatly improving the damping efficiency, compared with the traditional single-stage damping structure, different intensity of vibration impact can be more accurately responded, the body bounce amplitude is effectively reduced, and the ride comfort is improved.
[0015] 2. The automobile shock absorber piston rod assembly with multi-stage buffering function, the opening and closing mechanism is matched by the fixing seat, the fixing rod, the first fixing plate, the first pressure plate, the first spring, the second fixing plate, the second pressure plate and the second spring, and the first oil hole, the second oil hole and the third oil hole are arranged, so that the flow of oil can be accurately controlled according to the movement of the piston rod and the change of oil pressure. The first pressure plate shields the first oil hole through the elastic force of the first spring, and the second pressure plate shields the second oil hole through the elastic force of the second spring, which can automatically adjust the flow channel and flow of oil according to different damping requirements, realize more accurate damping effect, and improve the adaptability of the shock absorber to different road conditions and driving states. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art:
[0017] Figure 1 It is a three-dimensional schematic view of the structure of the utility model;
[0018] Figure 2 It is a three-dimensional schematic view of the surface section of the outer cylinder and the inner cylinder of the structure of the utility model;
[0019] Figure 3 It is a three-dimensional schematic view of the fixed ring and the sliding ring of the structure of the utility model;
[0020] Figure 4 It is a three-dimensional schematic view of the first damping spring and the damping rod of the structure of the utility model;
[0021] Figure 5 It is a three-dimensional schematic view of the fixing seat and the third oil hole of the structure of the utility model;
[0022] Figure 6 It is a three-dimensional schematic view of the surface section of the fixing seat of the structure of the utility model.
[0023] Figure: 1, outer cylinder; 2, inner cylinder; 3, oil cavity; 4, sealing block; 5, piston rod; 6, piston; 7, buffer mechanism; 71, fixed ring; 72, guide rod; 73, sliding ring; 74, limiting ring; 75, first shock absorbing spring; 76, damping rod; 77, first fixed disc; 78, second fixed disc; 79, second shock absorbing spring; 8, opening and closing mechanism; 81, fixed seat; 82, fixed rod; 83, first fixed plate; 84, first pressure plate; 85, first spring; 86, first oil hole; 87, second fixed plate; 88, second pressure plate; 89, second spring; 811, second oil hole; 812, third oil hole. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0025] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0026] The present application provides the following technical solutions:
[0027] Embodiment one
[0028] Please refer to Figures 1-4 The present application provides a technical solution: a piston rod assembly of an automobile shock absorber with multi-stage buffering function, comprising an outer cylinder 1, an inner cylinder 2 is fixedly connected to the top inner wall of the outer cylinder 1, an oil cavity 3 is formed between the outer cylinder 1 and the inner cylinder 2, a sealing block 4 is fixedly connected to the top of the outer cylinder 1, a piston rod 5 is arranged on the top of the sealing block 4, a piston 6 is fixedly connected to the bottom end of the piston rod 5, a buffer mechanism 7 is arranged on the inner wall of the inner cylinder 2, and an opening and closing mechanism 8 is fixedly connected to the inner wall of the inner cylinder 2 near the bottom;
[0029] The buffer mechanism 7 comprises a fixed ring 71 fixedly connected to the inner wall of the inner cylinder 2 near the top, a plurality of guide rods 72 are fixedly connected to the top of the fixed ring 71 in a circular equidistant array, a sliding ring 73 is slidingly connected to the upper and lower guide rods 72, a limiting ring 74 is fixedly connected to the top end of the guide rod 72, a first damping spring 75 is sleeved on the surface of the guide rod 72 between the fixed ring 71 and the sliding ring 73, a plurality of damping rods 76 are fixedly connected to the top of the fixed ring 71 in a circular equidistant array, a first fixed disc 77 is fixedly connected to the top of the outer cylinder 1, a second fixed disc 78 is fixedly connected to the surface of the piston rod 5 near the top end, and a second damping spring 79 is sleeved on the surface of the piston rod 5 between the first fixed disc 77 and the second fixed disc 78.
[0030] The oil cavity 3 is in a triangular shape with a wide bottom and a narrow top, the top of the sealing block 4 is provided with a hole matched with the piston rod 5, the surface of the piston rod 5 penetrates the hole and is slidingly connected to the hole, and the surface of the piston 6 is slidingly connected to the inner wall of the inner cylinder 2.
[0031] The inner wall of the sliding ring 73 is fixedly connected to the surface of the piston rod 5, the bottom end of the first damping spring 75 is fixedly connected to the top of the fixed ring 71, and the top end of the first damping spring 75 is fixedly connected to the bottom of the sliding ring 73.
[0032] The inner diameter of the sliding ring 73 and the inner diameter of the limiting ring 74 are both greater than the diameter of the piston rod 5, the bottom end of the second damping spring 79 is fixedly connected to the top of the first fixed disc 77, and the top end of the second damping spring 79 is fixedly connected to the bottom of the second fixed disc 78.
[0033] Example two
[0034] Please refer to Figures 5-6 , and on the basis of example one, further get the opening and closing mechanism 8.
[0035] The opening and closing mechanism 8 comprises a fixed seat 81 fixedly connected to the inner wall of the inner cylinder 2 near the bottom, a fixed rod 82 fixedly connected to the top of the fixed seat 81, a first fixed plate 83 fixedly connected to the top end of the fixed rod 82, a first pressing plate 84 slidingly connected to the surface of the fixed rod 82, a first spring 85 sleeved on the surface of the fixed rod 82 between the first fixed plate 83 and the first pressing plate 84, a first oil hole 86 formed in the top of the fixed seat 81 near the edge, a second fixed plate 87 fixedly connected to the bottom end of the fixed rod 82, a second pressing plate 88 slidingly connected to the surface of the fixed rod 82, a second spring 89 sleeved on the surface of the fixed rod 82 between the second fixed plate 87 and the second pressing plate 88, and the fixed rod 82 is provided with a second oil hole 811 in the top, and the inner wall of the inner cylinder 2 is provided with a third oil hole 812 in the bottom.
[0036] The top of the fixing base 81 is provided with a hole matched with the fixing rod 82, and the fixing rod 82 is fixedly connected in the hole, and the bottom end of the fixing rod 82 is below the fixing base 81, the top end of the first spring 85 is fixedly connected to the bottom of the first fixing plate 83, and the bottom end of the first spring 85 is fixedly connected to the top of the first pressing plate 84, and the first pressing plate 84 is shielded from the first oil hole 86 by the elastic force of the first spring 85.
[0037] The top of the first pressing plate 84 is provided with a hole corresponding to the second oil hole 811, the bottom end of the second spring 89 is fixedly connected to the top of the second fixing plate 87, the top end of the second spring 89 is fixedly connected to the bottom of the second pressing plate 88, and the second pressing plate 88 is shielded from the second oil hole 811 by the elastic force of the spring.
[0038] In actual operation, when the device is used, when the car is in a stable driving state, the piston rod 5 is in a relatively static position, the sliding ring 73 is in a certain position on the guide rod 72, the first damping spring 75 is in a natural state or a slightly compressed state, and the second damping spring 79 is also in a relatively stable state, at this time, the buffer mechanism 7 does not obviously hinder the movement of the piston rod 5, when the car encounters uneven road and vibrates, the piston rod 5 starts to move up and down. If the vibration amplitude is small, the piston rod 5 drives the sliding ring 73 to slide up and down on the guide rod 72. In the sliding process, the first damping spring 75 is compressed or stretched, absorbing and consuming part of the vibration energy, playing a primary buffering role. At the same time, the damping rod 76 also hinders the movement of the sliding ring 73 to a certain extent, further consuming energy and reducing vibration transmission, when the vibration amplitude is large, the movement amplitude of the piston rod 5 also increases accordingly. At this time, in addition to the first damping spring 75 continuing to play a role, the second fixing disc 78 on the surface of the piston rod 5 will compress or stretch the second damping spring 79 between the first fixing disc 77 and the second fixing disc 78, and the second damping spring 79 will participate in the buffering process, providing secondary buffering, further absorbing and dispersing vibration energy, reducing the movement speed and amplitude of the piston rod 5, thereby reducing the vibration of the car;
[0039] When the automobile is running normally or the vibration is small, the opening and closing mechanism 8 is in the initial state. The first pressure plate 84 is tightly attached to the top of the fixed seat 81 under the elastic force of the first spring 85, and the first oil hole 86 is blocked, preventing the oil from flowing out of the first oil hole 86 in large quantities. The second pressure plate 88 is tightly attached to the bottom of the fixed seat 81 under the elastic force of the second spring 89, and the second oil hole 811 is blocked, preventing the oil from flowing out of the second oil hole 811 in large quantities. At this time, the oil mainly flows slowly through the third oil hole 812 opened at the bottom of the inner cylinder 2 inner wall to maintain the balance of the oil inside the shock absorber. When the automobile encounters a large vibration, the piston rod 5 drives the piston 6 to move quickly, and the oil pressure in the inner cylinder 2 changes. When the oil pressure increases to a certain extent, the second pressure plate 88 generates downward pressure. When the pressure overcomes the elastic force of the second spring 89, the first pressure plate 84 will move downward, opening the second oil hole 811, and the second pressure plate 88 will also move upward, opening the second oil hole 811. At this time, the oil can flow quickly through the second oil hole 811, increasing the flow speed and flow of the oil, thereby changing the damping characteristics of the shock absorber, so that it can better adapt to large vibrations. As the vibration weakens, the oil pressure in the inner cylinder 2 gradually decreases. When the pressure decreases to a certain extent, the elastic force of the second spring 89 will make the second pressure plate 88 move upward again, respectively blocking the second oil hole 811, so that the oil flow returns to the initial slow state, and the shock absorber returns to the normal damping characteristics. The oil will flow upward, and the first pressure plate 84 will generate upward pressure. When the pressure overcomes the elastic force of the first spring 85, the second pressure plate 88 will move upward, opening the first oil hole 86.
[0040] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.
Claims
1. A piston rod assembly for an automotive shock absorber with multi-stage buffering function, comprising an outer cylinder (1), characterized in that: The outer cylinder (1) is fixedly connected to the top of the inner wall of the inner cylinder (2), and an oil cavity (3) is formed between the outer cylinder (1) and the inner cylinder (2). The top of the outer cylinder (1) is fixedly connected to a sealing block (4), and a piston rod (5) is provided on the top of the sealing block (4). A piston (6) is fixedly connected to the bottom of the piston rod (5). A buffer mechanism (7) is provided on the inner wall of the inner cylinder (2), and an opening and closing mechanism (8) is fixedly connected to the inner wall of the inner cylinder (2) near the bottom. The buffer mechanism (7) includes a fixed ring (71), which is fixedly connected to the inner wall of the inner cylinder (2) near the top. The top of the fixed ring (71) is fixedly connected to a guide rod (72) in a circular equidistant array. The guide rod (72) is slidably connected to a sliding ring (73). The top of the guide rod (72) is fixedly connected to a limit ring (74). A first damping spring (75) is sleeved on the surface of the guide rod (72) between the fixed ring (71) and the sliding ring (73). A damping rod (76) is fixedly connected to the top of the fixed ring (71) in a circular equidistant array. A first fixed plate (77) is fixedly connected to the top of the outer cylinder (1). A second fixed plate (78) is fixedly connected to the surface of the piston rod (5) near the top. A second damping spring (79) is sleeved on the surface of the piston rod (5) between the first fixed plate (77) and the second fixed plate (78).
2. The piston rod assembly of an automotive shock absorber with multi-stage buffering function according to claim 1, characterized in that: The oil chamber (3) is triangular in shape, wider at the bottom and narrower at the top. The top of the sealing block (4) has a hole that matches the piston rod (5), and the surface of the piston rod (5) is slidably connected to the hole. The surface of the piston (6) is slidably connected to the inner wall of the inner cylinder (2).
3. The piston rod assembly of an automotive shock absorber with multi-stage buffering function according to claim 1, characterized in that: The inner wall of the sliding ring (73) is fixedly connected to the surface of the piston rod (5), the bottom end of the first damping spring (75) is fixedly connected to the top of the fixed ring (71), and the top end of the first damping spring (75) is fixedly connected to the bottom of the sliding ring (73).
4. The piston rod assembly of an automotive shock absorber with multi-stage buffering function according to claim 1, characterized in that: The inner diameter of the sliding ring (73) and the inner diameter of the limiting ring (74) are both larger than the diameter of the piston rod (5). The bottom end of the second damping spring (79) is fixedly connected to the top of the first fixed plate (77), and the top end of the second damping spring (79) is fixedly connected to the bottom of the second fixed plate (78).
5. The piston rod assembly of an automotive shock absorber with multi-stage buffering function according to claim 1, characterized in that: The opening and closing mechanism (8) includes a fixed seat (81), which is fixedly connected to the inner wall of the inner cylinder (2) near the bottom. A fixed rod (82) is fixedly connected to the top of the fixed seat (81), and a first fixed plate (83) is fixedly connected to the top of the fixed rod (82). A first pressure plate (84) is slidably connected to the surface of the fixed rod (82). A first spring (85) is fitted between the first fixed plate (83) and the first pressure plate (84) on the surface of the fixed rod (82). 1) A first oil hole (86) is provided near the edge of the top. A second fixing plate (87) is fixedly connected to the bottom end of the fixing rod (82). A second pressure plate (88) is slidably connected to the surface of the fixing rod (82). A second spring (89) is sleeved between the second fixing plate (87) and the second pressure plate (88) on the surface of the fixing rod (82). A second oil hole (811) is provided on the top of the fixing seat (81). A third oil hole (812) is provided at the bottom of the inner wall of the inner cylinder (2).
6. A piston rod assembly for an automotive shock absorber with multi-stage buffering function according to claim 5, characterized in that: The top of the fixed base (81) is provided with a hole that matches the fixed rod (82), and the surface of the fixed rod (82) is penetrated and fixedly connected to the hole. The bottom end of the fixed rod (82) is located below the fixed base (81). The top end of the first spring (85) is fixedly connected to the bottom of the first fixed plate (83), and the bottom end of the first spring (85) is fixedly connected to the top of the first pressure plate (84).
7. A piston rod assembly for an automotive shock absorber with multi-stage buffering function according to claim 5, characterized in that: The first pressure plate (84) has a hole at the top corresponding to the second oil hole (811), the bottom end of the second spring (89) is fixedly connected to the top of the second fixing plate (87), and the top end of the second spring (89) is fixedly connected to the bottom of the second pressure plate (88).