A double acting cylinder shock absorber for automobile

Abstract

The present invention discloses a double-acting cylinder shock absorber for automobile, comprising: a connecting rod, a guide seat, a working cylinder and an oil storage cylinder, the top ends of the working cylinder and the oil storage cylinder are both connected to the guide seat, and the bottom ends are both connected to the lower support, the outer diameter of the working cylinder is smaller than the inner diameter of the oil storage cylinder; the bottom end of the connecting rod is located in the working cylinder, and the bottom end of the connecting rod is connected to a damping assembly, and the top end of the connecting rod passes through the guide seat and is connected to an upper support; a groove is provided on the top surface of the guide seat, and a sealing ring is detachably connected in the groove; the present invention adopts elastic elements and pistons made of metal rubber, which greatly reduces the cleanliness requirements of the shock absorber and the surface roughness requirements of the connecting rod, and reduces the production cost; at the same time, it also has the characteristics of reliable sealing, high / low temperature resistance, oil self-filtration and regeneration function, simple structure, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a double-acting cylinder shock absorber for an automobile. Background Art

[0002] Automobile shock absorbers are the primary components that generate damping force. Their function is to accelerate the attenuation of vehicle body and frame vibrations, improving the vehicle's ride smoothness. Currently, the shock absorbers used in automobiles are primarily bidirectional, cylindrical hydraulic shock absorbers. They operate in both compression and extension strokes, with the damping force generated in the extension stroke being much greater than that generated in the compression stroke.

[0003] Traditional automotive shock absorbers use single- or double-edged rubber seals. Since shock absorbers are installed in the vehicle chassis and suspension system, operating in a dirty environment, they generally require a fatigue life of at least one million cycles. To ensure the longevity of the rubber seals, specific limits are set for shock absorber cleanliness and connecting rod surface roughness. Typical cleanliness limits (mg) are between 40+S and 80+3S (S represents the shock absorber stroke in centimeters), and the connecting rod surface roughness must be Ra ≤ 0.16μm. To achieve varying damping forces in both directions, the piston structure of traditional shock absorbers incorporates extension valves and flow valves containing coil springs with varying elastic coefficients. Consequently, traditional automotive shock absorber connecting rods have stringent requirements for surface roughness machining, assembly cleanliness, and other processes, leading to high production costs. Furthermore, the rubber seals suffer from poor high and low temperature adaptability and a complex piston structure. Summary of the Invention

[0004] The object of the present invention is to provide a double-acting cylinder shock absorber for an automobile to solve the above-mentioned multiple defects or one of the defects caused by the prior art.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] A double-acting cylinder-type shock absorber for an automobile comprises: a connecting rod, a guide seat, a working cylinder and an oil storage cylinder, wherein the top ends of the working cylinder and the top ends of the oil storage cylinder are both connected to the guide seat, and the bottom ends are both connected to a lower support, and the outer diameter of the working cylinder is smaller than the inner diameter of the oil storage cylinder;

[0007] The bottom end of the connecting rod is located in the working cylinder, and the bottom end of the connecting rod is connected to the damping assembly. The top end of the connecting rod passes through the guide seat and is connected to the upper support. The top surface of the guide seat is provided with a groove, and a sealing ring is detachably connected to the groove.

[0008] Furthermore, an internal thread is provided in the groove on the top surface of the guide seat, and the sealing ring is fixed in the groove by a ring nut.

[0009] Furthermore, the sealing ring is C-shaped.

[0010] Furthermore, the sealing ring includes a housing and a metal-rubber elastic element, which is filled within the housing. Compared to rubber, the metal-rubber elastic element not only has the same good elasticity and stronger damping performance as rubber, but also has the characteristics of metal materials such as high and low temperature resistance, corrosion resistance, aging resistance, and immunity to radiation environments.

[0011] Furthermore, the shell has an open end, and the length of the open end is 1 / 3 of the total length of the shell.

[0012] Furthermore, the damping assembly includes a first baffle and a second baffle connected to the connecting rod, and a metal rubber piston is connected between the first baffle and the second baffle;

[0013] The metal rubber piston has a first working state and a second working state. In the first working state, the distal end of the metal rubber piston is in contact with the second baffle. In the second working state, the distal end of the metal rubber piston is not in contact with the second baffle.

[0014] Furthermore, the outer diameters of the second baffle, the first baffle, and the metal rubber piston are all smaller than the inner diameter of the working cylinder, thereby preventing friction between the outer periphery of the damping assembly and the inner ring of the working cylinder and ensuring its service life.

[0015] Furthermore, the metal rubber piston has a stepped first end surface and a flush second end surface. The first end surface of the metal rubber piston is connected to the first baffle, and the second end surface is connected to the second baffle. The stepped first end surface has a thickness at the distal end that is thinner than that at the proximal end, facilitating upward and downward movement of the distal end during movement of the metal rubber piston.

[0016] Furthermore, the first baffle and the second baffle are both provided with through holes, which can be square or circular in shape, and whose area accounts for at least 2 / 3-3 / 4 of the baffle area, so as to ensure that the oil can flow smoothly above and below the damping assembly.

[0017] Furthermore, a dust cover is connected to the upper support. The installation of the dust cover can reduce a large amount of dust from falling onto the outer surface of the cylinder or the connecting rod, thereby ensuring the cleanliness of the connecting rod surface.

[0018] According to the above technical solution, the embodiments of the present invention have at least the following effects:

[0019] 1. The present invention uses elastic elements and pistons made of metal rubber, which greatly reduces the requirements for cleanliness of the shock absorber and the surface roughness of the connecting rod, reducing production costs. At the same time, it also has the characteristics of reliable sealing, high / low temperature resistance, oil self-filtration and regeneration function, and simple structure.

[0020] 2. In the present invention, the metal rubber piston has a first working state and a second working state. When stretched, the metal rubber piston is in the first working state, and when compressed, the metal rubber piston is in the second working state. The metal rubber piston can be installed according to the requirements of the compression stroke damping force and the tension stroke damping force. If it is necessary to achieve that the tension stroke damping force is smaller than the compression stroke damping force, it is only necessary to change the positions of the two baffles and install the metal rubber piston in the upside-down direction. No additional parts need to be replaced, which is simple and convenient, and expands the applicability of the shock absorber product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a specific embodiment of the present invention;

[0022] Figure 2 A top view of a sealing ring in a specific embodiment of the present invention;

[0023] Figure 3 for Figure 2 Schematic diagram of the AA section;

[0024] Figure 4 A top view of a ring nut in a specific embodiment of the present invention;

[0025] Figure 5 for Figure 4 Schematic diagram of the middle BB section;

[0026] Figure 6 A top view of a metal rubber piston in a specific embodiment of the present invention;

[0027] Figure 7 for Figure 6 Schematic diagram of the CC section;

[0028] Figure 8 This is a front view of the first baffle in a specific embodiment of the present invention;

[0029] Figure 9 A top view of the first baffle in a specific embodiment of the present invention;

[0030] Figure 10 This is a front view of the second baffle in a specific embodiment of the present invention;

[0031] Figure 11 A top view of the second baffle in a specific embodiment of the present invention;

[0032] Figure 12 for Figure 1 A partial enlarged view of point E in the middle.

[0033] Among them: 1. Dust cover; 2. Connecting rod; 3. Guide seat; 4. Ring nut; 5. Sealing ring; 51. Housing; 52. Metal rubber elastic element; 6. Working cylinder; 7. Oil storage cylinder; 8. First baffle; 9. Metal rubber piston; 10. Second baffle; 11. Mounting nut. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] It should be noted that, in the description of the present invention, the terms "front," "rear," "left," "right," "up," "down," "inside," and "outside" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and do not require that the present invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "front," "rear," "left," "right," "up," and "down" used in the description of the present invention refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0036] like Figures 1 to 12 As shown, a double-acting cylinder shock absorber for automobile includes a connecting rod 2, a guide seat 3, a working cylinder 6 and an oil storage cylinder 7. The top ends of the working cylinder 6 and the top ends of the oil storage cylinder 7 are both connected to the guide seat, and the bottom ends are both connected to the lower support, forming a sealed space inside the cylinder, which is used to hold liquid oil.

[0037] The outer diameter of the working cylinder 6 is smaller than the inner diameter of the oil storage cylinder 7. The bottom end of the connecting rod 2 is located within the working cylinder 6, and the bottom end of the connecting rod 2 is connected to the damping assembly. The top end of the connecting rod 2 passes through the guide seat 3 and is connected to the upper support. The top surface of the guide seat 3 is provided with a groove, and a sealing ring 5 is removably connected to the groove. The sealing ring 5 acts as a seal to prevent the liquid oil in the working cylinder 6 from entering the upper part. When the device is in use, the upper and lower supports are subjected to force to compress or stretch the connecting rod 2. The bottom end of the connecting rod 2 drives the damping assembly to move within the working cylinder 6. The damping assembly provides a damping force to achieve a shock absorption effect.

[0038] Attachment Figure 1The figure is a structural diagram of an embodiment of the present invention. The specific technical solution consists of a dust cover 1, a connecting rod 2, a guide seat 3, a ring nut 4, a sealing ring 5, a working cylinder 6, an oil storage cylinder 7, a first baffle 8, a metal rubber piston 9, a second baffle 10, and a mounting nut 11. Among them, the working cylinder 6 and the oil storage cylinder 7 are welded to the guide seat 3 from the inside and the outside. The inner diameter D of the working cylinder 6 is 30mm. The dust cover 1 is welded to the upper end of the connecting rod 2. The sealing ring 5 is pressed onto the guide seat 3 through the thread of the ring nut 4. The inner end face of the sealing ring 5 forms an oil seal with the outer surface of the connecting rod 2. The lower end of the connecting rod 2 is respectively installed with the first baffle 8, the metal rubber piston 9, and the second baffle 10, and is tightly connected to the connecting rod 2 through the mounting nut 11.

[0039] As attached Figure 2 As shown, the sealing ring 5 is an annular C-shaped ring. The specific technical solution comprises a housing 51 and a metal-rubber elastic element 52. The C-shaped housing is made of 0.3mm thick polytetrafluoroethylene strip. The ratio of the C-shaped housing opening length to the sealing ring base length is l = 1 / 3L, and the sealing ring height H1 = 3mm. Within the C-shaped housing 51 is an elastic element with a rectangular cross-section, formed by pressing metal-rubber material. Made from metal wire through a specific process, this metal-rubber elastic element 52 has a spatial network structure similar to that of rubber. Compared to rubber, it not only possesses the same good elasticity and stronger damping properties as rubber, but also shares the characteristics of metal, such as high and low temperature resistance, corrosion resistance, aging resistance, and radiation resistance. Compared with ordinary rubber seals, this metal rubber sealing ring has lower requirements for the surface roughness of the connecting rod, with a surface roughness of Ra=0.32μm, and the shock absorber cleanliness (mg) requirement of 160+2S (S is the shock absorber stroke, calculated in centimeters). At the same time, this metal rubber sealing ring has better high and low temperature resistance and environmental adaptability than traditional rubber seals.

[0040] As attached Figure 6 The metal rubber piston 9 shown is made of pressed metal rubber, with an outer diameter of D2 = 29mm and a thickness (i.e., height direction) of H2 = 6mm. It gradually becomes thinner from 1 / 2 of its diameter to the outermost end, with the thinnest thickness H3 = 3mm. The thinned part is located at the first end face of the metal rubber piston 9. When the piston moves up and down with the connecting rod 2, the shock absorber oil flows through the gap between the metal rubber piston 9 itself and the gap between the piston and the inner wall of the working cylinder 6, forming a damping force. When the shock absorber is in a tensile working state, the metal rubber piston remains flat and fits the second baffle 10, and the gap between the upper and lower chambers of the working cylinder 6 remains unchanged. When the shock absorber is in a compressive working state, the far end of the metal rubber piston 9 (the end away from the connecting rod is the far end, and the end close to the connecting rod is the proximal end) will gradually roll up under the action of the damping force. The partial view of the piston end is shown in the figure. Figure 12As shown, this increases the gap between the metal rubber piston 9 and the inner wall of the working cylinder 6, resulting in a smaller damping force during the compression stroke than during the extension stroke. Furthermore, this metal rubber piston structure offers the benefit of a filtering and regeneration function. Particles or other impurities in the shock absorber oil prevent the numerous gaps in the metal rubber from clogging. Even if a small amount of impurities do adhere, the bidirectional flow of the oil allows for regeneration (clearing any impurities that have entered the gaps). Therefore, the metal rubber piston's performance is not affected by unclean shock absorber oil.

[0041] As attached Figures 8 and 9 The first baffle 8 and the attached Figure 10-11 The second baffle 10 shown is made of medium-carbon steel and has a thickness of 1 mm. It features a circular through-hole that occupies 2 / 3 to 3 / 4 of the baffle area to ensure smooth passage of oil. The outer diameter D3 of the first baffle is equal to half the outer diameter of the metal rubber piston, i.e., D3 = 14.5 mm. The outer diameter D4 of the second baffle is equal to the outer diameter of the metal rubber piston, i.e., D4 = 29 mm.

[0042] One advantage of this invention is that the use of seals and pistons made of metal rubber significantly reduces the requirements for shock absorber cleanliness and connecting rod surface roughness, thereby reducing production costs. Furthermore, the invention offers high and low temperature resistance, high reliability, oil self-filtration and regeneration, and a simple structure.

[0043] Another advantage of the present invention is that if it is necessary to achieve a tensile stroke damping force that is smaller than a compression stroke damping force, it is only necessary to change the positions of the first baffle 8 and the second baffle 10 and install the metal rubber piston 9 in reverse up and down. There is no need to replace parts separately, which is simple and convenient, and improves the applicability of the shock absorber product.

[0044] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A double-acting cylinder shock absorber for automobile, characterized in that: include: A connecting rod (2), a guide seat (3), a working cylinder (6) and an oil storage cylinder (7), wherein the top ends of the working cylinder (6) and the top ends of the oil storage cylinder (7) are both connected to the guide seat (3), and the bottom ends are both connected to the lower support, and the outer diameter of the working cylinder (6) is smaller than the inner diameter of the oil storage cylinder (7); The bottom end of the connecting rod (2) is located in the working cylinder (6), and the bottom end of the connecting rod (2) is connected to a damping assembly, and the top end of the connecting rod (2) passes through the guide seat (3) and is connected to the upper support; the top surface of the guide seat (3) is provided with a groove, and a sealing ring (5) is detachably connected in the groove; The damping assembly comprises a first baffle (8) and a second baffle (10) connected to the connecting rod (2); a metal rubber piston (9) is connected between the first baffle (8) and the second baffle (10); a first end surface of the metal rubber piston (9) is stepped, and a second end surface is flush; an outer diameter of the first baffle (8) is smaller than an outer diameter of the second baffle (10); The metal rubber piston (9) has a first working state and a second working state; wherein the first working state is when the shock absorber is in a stretched state, and the second working state is when the shock absorber is in a compressed state; in the first working state, the distal end of the metal rubber piston (9) fits the second baffle (10), and in the second working state, the distal end of the metal rubber piston (9) does not fit the second baffle (10); wherein the end away from the connecting rod (2) is the distal end; If it is to be achieved that the damping force of the stretching stroke is greater than the damping force of the compression stroke, the bottom end of the connecting rod (2) is connected to the first baffle (8), the metal rubber piston (9) and the second baffle (10) in sequence from the upper support to the lower support; if it is to be achieved that the damping force of the stretching stroke is less than the damping force of the compression stroke, the bottom end of the connecting rod (2) is connected to the second baffle (10), the metal rubber piston (9) and the first baffle (8) in sequence from the upper support to the lower support; the first end face of the metal rubber piston (9) is connected to the first baffle (8), and the second end face is connected to the second baffle (10).

2. The cartridge shock absorber according to claim 1, characterized in that: An internal thread is provided in the groove on the top surface of the guide seat (3), and the sealing ring (5) is fixed in the groove by a ring nut (4).

3. The cartridge shock absorber according to claim 1, characterized in that: The sealing ring (5) is in a C-shape.

4. The cartridge type shock absorber according to claim 1, characterized in that: The sealing ring (5) comprises an outer shell (51) and a metal rubber elastic element (52), wherein the metal rubber elastic element (52) is filled in the outer shell (51).

5. The cartridge type shock absorber according to claim 4, characterized in that: The shell (51) has an open end, and the length of the open end is 1 / 3 of the total length of the shell (51).

6. The cartridge type shock absorber according to claim 1, characterized in that: The outer diameter of the second baffle (10), the outer diameter of the first baffle (8) and the outer diameter of the metal rubber piston (9) are all smaller than the inner diameter of the working cylinder (6).

7. The cartridge type shock absorber according to claim 1, characterized in that: Through holes are provided on both the first baffle plate (8) and the second baffle plate (10).

8. The cartridge type shock absorber according to claim 1, characterized in that: The upper support is connected to a dust cover (1).

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