Damping-variable single-cylinder shock absorber provided with progressive damping-variable limiting device

Abstract

The utility model discloses a variable-damping single-barrel shock absorber provided with a progressive variable-damping limiting device. The variable-damping single-barrel shock absorber comprises a piston rod, a piston valve plate assembly, a liquid storage cylinder barrel, a guider and a floating piston. An oil cavity is formed in the upper side of the floating piston; the piston valve plate assembly divides the oil cavity into an upper oil cavity and a lower oil cavity; a progressive variable damping limiting device and a buffer block are arranged in the upper oil cavity; the buffer block is fixed to the position close to the piston valve block assembly, and the buffer block is located on the lower side of the progressive variable damping limiting device to limit the progressive variable damping limiting device. The outer contour of the progressive variable damping limiting device is in a waist drum shape with two small ends and a large middle part; the progressive variable damping limiting device is not in contact with the inner wall of the liquid storage cylinder barrel, and a hydraulic oil flowing channel A is formed between the progressive variable damping limiting device and the liquid storage cylinder barrel. The gradual variable damping limiting device is arranged in the shock absorber, damping adjustment is achieved, meanwhile, the running process of the shock absorber can be limited, vibration and bumping caused by severe road conditions are effectively reduced, and the service life of the shock absorber is prolonged.

Description

Technical Field

[0001] The utility model relates to a shock absorber, in particular to a variable damping single-tube shock absorber equipped with a progressive variable damping limit device. Background Art

[0002] With the booming automotive industry, consumers are increasingly demanding new features from their vehicles. They are no longer limited to simply obtaining the basic functions of the product itself, but are now placing higher demands on the comfort and operability of the vehicle. Currently, existing shock absorbers generally adopt a fixed structure. During operation, the shock absorber drives the piston rod up and down, changing the volume of the front and rear cavities of the piston. The pressure difference is used to force the oil to flow through the front and rear cavities of the piston, and the throttling holes on the piston are used to convert kinetic energy into heat energy, thereby achieving vibration reduction. This structure ensures that the damping force of the shock absorber remains basically unchanged during the recovery and compression strokes, which cannot effectively meet the driver's pursuit of vehicle comfort and operability under different road conditions. Therefore, driven by consumer demand, major manufacturers are focusing on the development of shock absorbers with adjustable damping. Chinese patent application number 202310541065.6 discloses a shock absorber with adjustable damping. This device utilizes a regulating valve stem installed in a hollow piston rod with a through-hole A defined in its inner wall. A hollow compression buffer block with a through-hole B is installed at the lower end of the piston valve plate assembly. The regulating valve stem, and thus the overlap between the regulating head and through-hole A, is controlled by the regulating assembly to achieve variable oil flow rates in the front and rear chambers of the piston. This achieves adjustable damping, effectively improving driver and passenger comfort. High-end vehicles utilize more advanced electromagnetic damping adjustable shock absorbers, but these are complex in structure and require vertical acceleration sensors. This increases manufacturing and maintenance costs, making them ineffective in the increasingly competitive automotive market. Consequently, adjustable damping shock absorbers are becoming increasingly important, and developing a simple, low-cost, and high-performance adjustable damping shock absorber has become a pressing issue in the automotive industry.

[0003] At the same time, to ensure the smooth and effective operation of the shock absorbers under different road conditions, they must be limited. The main purpose of the limit structure is to prevent serious consequences caused by shock absorber failure and to improve the safety of drivers and passengers. Limiting the most widely used cylinder shock absorbers allows them to withstand greater impact when the car passes through harsh road conditions, thereby increasing their service life. However, most existing shock absorbers cannot simultaneously meet the dual functions of adjustable damping and limit buffering. How to simultaneously meet the dual functions of adjustable damping and limit buffering in shock absorbers is an urgent problem that needs to be solved. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention provides a variable damping monotube shock absorber equipped with a progressively variable damping stopper. This shock absorber incorporates a specially constructed progressively variable damping stopper, enabling adjustable damping while also limiting the shock absorber's operating position. This effectively reduces vibration and bumps caused by harsh road conditions and extends the shock absorber's service life. It also features a simple structure, small footprint, and low manufacturing and maintenance costs.

[0005] The technical solution of the utility model is as follows:

[0006] A variable damping single-tube shock absorber equipped with a progressive variable damping limit device comprises a piston rod, a piston valve assembly, a liquid storage cylinder, a guide and a floating piston; the piston valve assembly is mounted on the piston rod; the guide is mounted on the upper end of the liquid storage cylinder; the floating piston is arranged in the liquid storage cylinder and forms a sliding fit with the liquid storage cylinder; the lower side of the floating piston is an air chamber, and the upper side of the floating piston is an oil chamber, the air chamber is filled with high-pressure gas, and the oil chamber is filled with shock absorber oil; the piston valve assembly is arranged in the oil chamber and forms a sliding fit with the liquid storage cylinder, and the piston valve assembly separates the oil chamber The upper oil chamber and the lower oil chamber are formed; the piston rod extends from the top of the liquid storage cylinder and forms a sliding fit with the guide; a progressively variable damping limit device and a buffer block are provided in the upper oil chamber; the progressively variable damping limit device and the buffer block are both sleeved on the piston rod; the buffer block is fixed at a position close to the piston valve plate assembly, and the buffer block is located on the lower side of the progressively variable damping limit device to limit it; the outer contour of the progressively variable damping limit device is a waist drum shape with small ends and a large middle; the progressively variable damping limit device has no contact with the inner wall of the liquid storage cylinder, and a hydraulic oil flow channel A is formed between the two.

[0007] Compared with the prior art, the variable damping shock absorber of the present invention is provided with a progressive variable damping limit device of a specific structure, and a hydraulic oil flow channel A is provided between the liquid storage cylinder and the progressive variable damping limit device. Since the outer contour of the progressive variable damping limit device is in the shape of a waist drum with small ends and large middle, the hydraulic oil flow channel A is large at both ends and small in the middle, that is, it changes from large to small and then to large. When the shock absorber runs at low speed, the pressure of the hydraulic oil in the hydraulic oil flow channel A basically does not change. When the shock absorber runs at medium speed, the hydraulic oil pressure in the narrow flow channel increases significantly, and the damping force increases at this time. As the shock absorber running speed continues to increase, this effect becomes more and more obvious, thereby realizing adjustable damping. At the end of the recovery stroke, when the progressive variable damping limit device contacts the guide, the shock absorber reaches the tensile limit, which can prevent the piston from hitting the shock absorber sealing system and play a role in protecting the piston, effectively preventing the serious consequences caused by shock absorber oil leakage and failure, thereby further improving the safety and comfort of users when driving. In addition, the utility model can meet the needs of different vehicle models by replacing the variable damping shock absorber, and has the advantage of easy debugging. The variable damping shock absorber adopted by the utility model also has the advantages of being easy to manufacture, taking up little space, and having low manufacturing and maintenance costs. The progressive variable damping limit device is sleeved on the piston rod, so that the piston rod is not easily deformed when subjected to external pressure, which is beneficial to improving the service life of the shock absorber.

[0008] As an optimization, the aforementioned variable damping monotube shock absorber equipped with a progressively variable damping stop comprises a tubular body with a set of axially distributed external ribs evenly distributed along the circumference of the outer surface of the tubular body. These ribs are streamlined, with a high center and low ends. This structure not only achieves lightweighting, but the streamlined ribs also enable continuous damping variation and provide a certain degree of noise reduction during shock absorber operation, effectively improving the vehicle's NVH level and thus enhancing driver and passenger comfort.

[0009] As an optimization, in the aforementioned variable damping monotube shock absorber equipped with a progressive variable damping limit device, the number of the outer ribs can be 3-6.

[0010] As an optimization, in the aforementioned variable damping monotube shock absorber equipped with a progressively variable damping stopper, a set of axially distributed internal ribs are circumferentially arranged on the inner surface of the progressively variable damping stopper. The progressively variable damping stopper abuts against the piston rod via these internal ribs, thereby forming a hydraulic oil flow channel B between the piston rod and the progressively variable damping stopper. During operation, hydraulic oil flow channel B acts as a drain, and this structural design also achieves the goal of further lightweighting.

[0011] As an optimization, in the aforementioned variable damping monotube shock absorber equipped with a progressive variable damping limit device, the number of the inner ribs can be 3-6.

[0012] As an optimization, in the aforementioned variable damping monotube shock absorber equipped with a progressive variable damping limit device, the inner rib is located in the lower middle part of the progressive variable damping limit device.

[0013] As an optimization, in the aforementioned variable damping monotube shock absorber equipped with a progressive variable damping stop, a set of strip grooves are uniformly arranged around the outer surface of the tubular body. This grooved outer surface increases the contact area with the hydraulic oil, facilitating heat dissipation from the shock absorber.

[0014] As an optimization, in the aforementioned variable damping monotube shock absorber equipped with a progressive variable damping limit device, the number of the strip grooves can be 3-6. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a variable damping monotube shock absorber equipped with a progressive variable damping limiter according to the present invention;

[0016] Figure 2 This is a schematic structural diagram of the progressive variable damping limiter device of the present invention;

[0017] Figure 3 This is a front view of the progressive variable damping limiter device of the present utility model;

[0018] Figure 4 yes Figure 3 A-axis sectional view of the progressive variable damping limit device.

[0019] Figure numerals: 1-progressive variable damping limit device, 101-tubular body, 102-outer rib, 103-inner rib, 104-strip groove; 2-piston rod; 3-buffer block; 4-piston valve plate assembly; 5-liquid storage cylinder; 6-guide; 7-floating piston. DETAILED DESCRIPTION

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, but is not intended to be construed as a basis for the present invention. The following contents not described in detail are common technical knowledge in the art.

[0021] Example (see Figure 1-4 ):

[0022] A variable damping single-tube shock absorber equipped with a progressive variable damping limit device comprises a piston rod 2, a piston valve plate assembly 4, a liquid storage cylinder 5, a guide 6 and a floating piston 7; the piston valve plate assembly 4 is mounted on the piston rod 2; the guide 6 is mounted on the upper end of the liquid storage cylinder 5; the floating piston 7 is arranged in the liquid storage cylinder 5 and forms a sliding fit with the liquid storage cylinder 5, the lower side of the floating piston 7 is an air chamber, and the upper side of the floating piston 7 is an oil chamber, the air chamber is filled with high-pressure gas, and the oil chamber is filled with shock absorber oil; the piston valve plate assembly 4 is arranged in the oil chamber and forms a sliding fit with the liquid storage cylinder 5, the piston valve plate assembly 4 divides the oil chamber into an upper oil chamber and a lower oil chamber; the piston The rod 2 extends from the top of the liquid storage cylinder 5 and forms a sliding fit with the guide 6; the above belongs to the prior art, and the difference from the prior art is that: in the utility model, a progressive variable damping limit device 1 and a buffer block 3 are provided in the upper oil chamber; the progressive variable damping limit device 1 and the buffer block 3 are both sleeved on the piston rod 2; the buffer block 3 is fixed at a position close to the piston valve plate assembly 4, and the buffer block 3 is located on the lower side of the progressive variable damping limit device 1 to limit it; the outer contour of the progressive variable damping limit device 1 is a waist drum shape with small ends and a large middle; the progressive variable damping limit device 1 has no contact with the inner wall of the liquid storage cylinder 5, and a hydraulic oil flow channel A is formed between the two.

[0023] The effect of the progressive variable damping stopper 1 varies when the shock absorber operates at different speeds. When the shock absorber operates at low speeds, the hydraulic oil pressure in different parts of hydraulic oil flow channel A remains essentially unchanged. When the shock absorber operates at medium speeds, the hydraulic oil pressure in narrow flow channels increases significantly, increasing the damping force. This effect becomes increasingly pronounced as the shock absorber's operating speed increases.

[0024] At the end of the recovery stroke of the shock absorber, when the progressive variable damping limiter 1 contacts the guide 6, the shock absorber reaches its stretching limit and plays a limiting role.

[0025] In this embodiment, the progressively variable damping stopper 1 comprises a tubular body 101. A set of axially distributed external ribs 102 are evenly distributed along the circumference of the outer surface of the tubular body 101. These ribs 102 are streamlined, with a high center and low ends. This streamlined profile design allows for continuous damping variation. During shock absorber commissioning, varying the streamline gradient of the outer ribs 102 can be used to achieve varying damping forces, meeting the requirements of different vehicle models.

[0026] In an embodiment, the inner surface of the progressive variable damping limit device 1 is provided with a group of inner ribs 103 distributed axially in the circumferential direction, and the progressive variable damping limit device 1 is abutted against the piston rod 2 through the inner ribs 103 thereon, thereby forming a hydraulic oil flow channel B between the piston rod 2 and the progressive variable damping limit device 1.

[0027] In the embodiment, the inner rib 103 is located in the lower middle portion of the progressive variable damping limiter 1 .

[0028] In an embodiment, a group of strip-shaped grooves 104 are uniformly provided on the outer surface of the tubular body 101 in the circumferential direction.

[0029] In this embodiment, there are four outer ribs 102 and four inner ribs 103. The outer ribs 102 and inner ribs 103 are staggered in the circumferential direction of the progressive variable damping limiter 1. Furthermore, there are four strip grooves 104, with one strip groove 104 provided between two adjacent outer ribs 102.

[0030] The above general description of the utility model and the description of its specific embodiments involved in this application should not be construed as limiting the technical solutions of the utility model. Based on the disclosure of this application, those skilled in the art may, without violating the constituent elements of the utility model involved, add to, subtract from, or combine the disclosed technical features in the above general description and / or specific embodiments (including examples) to form other technical solutions within the scope of protection of this application.

Claims

1. A variable damping single-tube shock absorber equipped with a progressive variable damping limit device, comprising a piston rod (2), a piston valve plate assembly (4), a liquid storage cylinder (5), a guide (6) and a floating piston (7); the piston valve plate assembly (4) is assembled on the piston rod (2); the guide (6) is assembled on the upper end of the liquid storage cylinder (5); the floating piston (7) is arranged in the liquid storage cylinder (5) and forms a sliding fit with the liquid storage cylinder (5); the lower side of the floating piston (7) is an air cavity, and the upper side of the floating piston (7) is an oil cavity, the air cavity is filled with high-pressure gas, and the oil cavity is filled with shock absorber oil; the piston valve plate assembly (4) is arranged in the oil cavity and forms a sliding fit with the liquid storage cylinder (5), and the piston valve plate assembly (4) divides the oil cavity into an upper oil cavity and a lower oil cavity; the piston rod (2) extends from the top of the liquid storage cylinder (5) and forms a sliding fit with the guide (6); Its characteristics are: A progressive variable damping limiter (1) and a buffer block (3) are provided in the upper oil chamber; the progressive variable damping limiter (1) and the buffer block (3) are both sleeved on the piston rod (2); the buffer block (3) is fixed at a position close to the piston valve plate assembly (4), and the buffer block (3) is located on the lower side of the progressive variable damping limiter (1) to limit it; the outer contour of the progressive variable damping limiter (1) is in the shape of a waist drum with small ends and a large middle; the progressive variable damping limiter (1) has no contact with the inner wall of the liquid storage cylinder (5), and a hydraulic oil flow channel A is formed between the two.

2. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 1, characterized in that: The progressive variable damping limiter (1) comprises a tubular body (101), the outer surface of the tubular body (101) being uniformly provided with a group of outer ribs (102) distributed in the axial direction in the circumferential direction, the outer ribs (102) being streamlined with a high middle and low ends.

3. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 2, characterized in that: The number of the outer ribs (102) is 3-6.

4. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 2, characterized in that: The inner surface of the progressive variable damping limiter (1) is provided with a group of inner ribs (103) distributed in the axial direction in the circumferential direction, and the progressive variable damping limiter (1) abuts against the piston rod (2) via the inner ribs (103) thereon, thereby forming a hydraulic oil flow channel B between the piston rod (2) and the progressive variable damping limiter (1).

5. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 4, characterized in that: The number of the inner ribs (103) is 3-6.

6. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 4, characterized in that: The inner rib (103) is located in the lower middle portion of the progressive variable damping limiter (1).

7. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 4, characterized in that: The outer surface of the tubular body (101) is evenly provided with a group of strip-shaped grooves (104) in the circumferential direction.

8. The variable damping monotube shock absorber equipped with a progressive variable damping limiter according to claim 7, characterized in that: The number of the strip-shaped grooves (104) is 3-6.

Images