Shock absorber of built-in vehicle hydraulic protection structure

Abstract

The utility model discloses a shock absorber with a built-in vehicle hydraulic protection structure, which relates to the field of automobile shock absorbers, and comprises an oil storage cylinder sleeved outside a working cylinder, an end cover mounted at the upper end of the oil storage cylinder, and a bottom cover mounted at the lower end of the oil storage cylinder; the piston rod penetrates through the working cylinder in a relatively sliding mode, the upper end of the piston rod penetrates out of the end cover, the piston assembly is installed on the lower portion of the piston rod, the lower end of the piston rod is fixedly connected with the hydraulic protection fixing rod, the outer wall of the piston rod is sleeved with the upper hydraulic protection sealing assembly, and the outer wall of the hydraulic protection fixing rod is sleeved with the lower hydraulic protection sealing assembly; a damping hole is formed in the inner wall of the upper protective sleeve to form an upper buffer cavity; the hydraulic protection bottom valve body is mounted on the shock absorber compression valve; a damping hole is formed in the inner wall of the lower protective sleeve to form a lower buffer cavity. According to the utility model, the limiting control of the upper and lower wheel jumps of the vehicle is simultaneously realized in the shock absorber, the protection is provided for the limiting working condition of the wheel jumps of the vehicle, the noise problem of the existing limiting protection is reduced, and the comfort of the vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile shock absorbers, in particular to a shock absorber with a built-in vehicle hydraulic protection structure. Background Art

[0002] When the wheels of existing vehicles vibrate up and down (or bounce), especially when the wheels bounce up and down to the limit, external buffer blocks and built-in buffer blocks of shock absorbers are used to limit the up and down jumping respectively. In some cases, vehicles have auxiliary body limiting structures to cooperate with limiting protection. In short, the protection measures are to prevent the body parts from failing due to impact interference when they are in the extreme position, reduce vibration impact and stabilize the body posture, which is conducive to maintaining the normal driving of the vehicle.

[0003] The above-mentioned external or built-in buffer blocks of the shock absorber are usually elastic parts, such as foamed polyurethane or rubber buffer blocks, which are generally placed outside the shock absorber body or inside the shock absorber. The external ones are in contact with the end and the upper support part of the shock absorber, and deform when subjected to force, absorbing the impact to alleviate the impact force and suppress excessive bouncing stroke. In some cases, the buffer blocks are arranged at positions around the shock absorber, without contacting the shock absorber, and independently suppress the vibration of the vehicle and limit the upper jump limit of the wheel. As for the internal ones, they are in contact with the upper end of the shock absorber, which will also produce a limiting impact and suppress the downward jump limit impact of the vehicle.

[0004] Regardless of the type of limit, it is a mechanical limit protection, which is most likely to cause noise and poor comfort, and the vehicle cannot achieve a better control level. The shock absorbers made of these limit protection structures have certain limitations and it is difficult to achieve a relatively strong vehicle comfort and control level.

[0005] In general, the existing technical solutions are mechanical structure limit protection, which often produces impact and friction noise during operation, and is even prone to loosening. In addition, it has serious defects in vehicle comfort and can only be applied to mid- and low-end models. In some cases, in order to obtain greater limit protection, it is necessary to design a larger buffer block, which takes up a larger space and consumes the layout space of the vehicle. Due to the limitations of component performance, shock absorbers with these limit protections are difficult to provide a relatively strong vehicle comfort and driving control level, which is not conducive to improving the tuning effect of the entire vehicle. Utility Model Content

[0006] The object of the utility model is to overcome the deficiencies existing in the prior art, and to provide a shock absorber with an internal vehicle hydraulic protection structure, which can simultaneously control the up-and-down wheel jump limit inside the shock absorber, provide protection for the extreme wheel jump conditions of the vehicle, and the shock absorber can provide support for the comfort and handling of other driving conditions of the vehicle; reduce the noise problem of the existing limit protection, improve the comfort of the vehicle; save the space required for the layout of the limit protection, and facilitate the layout of the whole vehicle space; in some cases, the size of the buffer block used for the external limit protection can be reduced to save space.

[0007] The object of the utility model is achieved by the following technical solutions: This shock absorber with an internal vehicle hydraulic protection structure includes:

[0008] An oil storage cylinder, sleeved outside the working cylinder. An end cover is installed at the upper end of the oil storage cylinder to press the oil seal and the guide against the upper opening of the working cylinder, and a bottom cover is installed at the lower end of the oil storage cylinder;

[0009] A piston rod, slidably passing through the working cylinder. The upper end of the piston rod passes through the end cover. A piston assembly is installed at the lower part of the piston rod, and the lower end of the piston rod passes through the piston assembly and is fixedly connected to a hydraulic protection fixed rod. An upper hydraulic protection sealing assembly is sleeved on the outer wall of the piston rod above the piston assembly, and a lower hydraulic protection sealing assembly is sleeved on the outer wall of the hydraulic protection fixed rod;

[0010] An upper protective sleeve, installed between the upper opening of the working cylinder and the guide. A number of damping holes are penetrated and opened on the inner wall of the upper protective sleeve, and an upper buffer cavity is formed inside the upper protective sleeve. When the piston rod drives the upper hydraulic protection sealing assembly into the upper buffer cavity, the oil fluid is discharged from the upper buffer cavity through the damping holes to generate damping;

[0011] A hydraulic protection bottom valve body, fixed to the lower opening of the working cylinder and installed on the shock absorber compression valve. The shock absorber compression valve is arranged above the bottom cover, and the upper end of the hydraulic protection bottom valve body extends into the working cylinder; and

[0012] A lower protective sleeve, installed at the upper end of the hydraulic protection bottom valve body. A number of damping holes are also penetrated and opened on the inner wall of the lower protective sleeve, and a lower buffer cavity is formed inside the lower protective sleeve. When the piston rod drives the lower hydraulic protection sealing assembly into the lower buffer cavity, the oil fluid is discharged from the lower buffer cavity through the damping holes to generate damping.

[0013] As a further technical solution, a gap is provided between the outer wall of the upper protective sleeve and the inner wall of the working cylinder to supply the oil fluid to be discharged from the damping holes.

[0014] As a further technical solution, a gap is provided between the outer wall of the lower protective sleeve and the inner wall of the working cylinder to supply the oil fluid to be discharged from the damping holes.

[0015] As a further technical solution, a spring disc is installed on the outer wall of the upper part of the oil storage cylinder.

[0016] As a further technical solution, a steering knuckle bracket is installed on the outer wall of the lower part of the oil storage cylinder.

[0017] As a further technical solution, both the upper hydraulic protection seal assembly and the lower hydraulic protection seal assembly include a seal block, a sealing ring and a snap ring. The sealing rings are arranged on the inner walls at the upper and lower ends of the seal block for corresponding sealing with the piston rod or the hydraulic protection fixing rod, and the snap ring is sleeved on the seal block to clamp the seal block tightly.

[0018] The beneficial effects of the utility model are as follows:

[0019] 1. Upgrade and improve the traditional external limit protection of the vehicle to hydraulic protection placed inside the shock absorber, effectively reducing the occupation rate of the working space;

[0020] 2. Realize the coordinated matching of the damping of the shock absorber itself and the hydraulic protection damping, providing the damping input of the shock absorber for the tuning performance of the whole vehicle itself and also providing limit protection for the vehicle under the extreme up and down jump conditions;

[0021] 3. The upper and lower hydraulic limit protections provide an optional solution for noise reduction and comfort improvement of the whole vehicle;

[0022] 4. In specific cases, the external buffer block parts for limit protection can be cancelled or reduced;

[0023] 5. The upper and lower hydraulic limit protections have excellent configuration capabilities with adjustable damping, having a large adjustment space and meeting the tuning improvement requirements of the whole vehicle. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the utility model.

[0025] Figure 2 It is Figure 1 a partial enlarged schematic diagram of area A in

[0026] Figure 3 It is Figure 1 a partial enlarged schematic diagram of area B in

[0027] Description of the reference numerals: end cap 1, oil seal 2, guide 3, upper buffer cavity 4, spring disc 5, oil storage cylinder 6, working cylinder 7, piston rod 8, upper hydraulic protection seal assembly 9, piston assembly 10, lower buffer cavity 11, hydraulic protection fixing rod 12, lower hydraulic protection seal assembly 13, hydraulic protection bottom valve body 14, shock absorber compression valve 15, bottom cover 16, steering knuckle bracket 17, upper protective sleeve 18, lower protective sleeve 19, damping hole 20, gap 21. Detailed Embodiment

[0028] The following will introduce the present utility model in detail with reference to the drawings:

[0029] Example: As shown in the attached Figures 1 to 3 As shown, the shock absorber of the built-in vehicle hydraulic protection structure includes an end cover 1, an oil seal 2, a guide 3, an upper buffer chamber 4, a spring plate 5, an oil storage cylinder 6, a working cylinder 7, a piston rod 8, an upper hydraulic protection seal assembly 9, a piston assembly 10, a lower buffer chamber 11, a hydraulic protection fixing rod 12, a lower hydraulic protection seal assembly 13, a hydraulic protection bottom valve body 14, a shock absorber compression valve 15, a bottom cover 16, a steering knuckle bracket 17, an upper protective sleeve 18, a lower protective sleeve 19, a damping hole 20 and a gap 21.

[0030] Reference Figure 1 The shock absorber adopts a double-tube type, the oil storage cylinder 6 is sleeved outside the working cylinder 7, the end cover 1 is installed on the upper end of the oil storage cylinder 6, the end cover 1 can press the oil seal 2 and the guide 3 on the upper opening of the working cylinder 7, and the bottom cover 16 is installed on the lower end of the oil storage cylinder 6. The piston rod 8 is relatively slidably inserted into the working cylinder 7, the upper end of the piston rod 8 passes through the end cover 1, the piston assembly 10 is installed on the lower part of the piston rod 8, and the lower end of the piston rod 8 passes through the piston assembly 10 and is connected and fixed with the hydraulic protection fixing rod 12. The upper hydraulic protection sealing assembly 9 is sleeved on the outer wall of the piston rod 8 above the piston assembly 10, and the lower hydraulic protection sealing assembly 13 is sleeved on the outer wall of the hydraulic protection fixing rod 12.

[0031] like Figure 1 , 2 As shown, the upper protective sleeve 18 is installed between the upper opening of the working cylinder 7 and the guide 3, and a plurality of damping holes 20 are formed through the inner wall of the upper protective sleeve 18, and an upper buffer chamber 4 is formed in the upper protective sleeve 18. When the piston rod 8 drives the upper hydraulic protection seal assembly 9 to enter the upper buffer chamber 4, the oil is discharged from the upper buffer chamber 4 through the damping holes 20 to generate damping. Preferably, a gap 21 is provided between the outer wall of the upper protective sleeve 18 and the inner wall of the working cylinder 7, and the oil enters the gap 21 after being discharged from the damping holes 20.

[0032] For further information, see Attachment Figure 1 , 3 , the hydraulic protection bottom valve body 14 is fixed to the lower opening of the working cylinder 7 and then installed on the shock absorber compression valve 15. The shock absorber compression valve 15 is arranged above the bottom cover 16. The upper end of the hydraulic protection bottom valve body 14 extends into the working cylinder 7, and the lower protective sleeve 19 is installed on the upper end of the hydraulic protection bottom valve body 14. The upper opening of the lower protective sleeve 19 rests on the inner wall of the working cylinder 7. Furthermore, a plurality of damping holes 20 are also provided on the inner wall of the lower protective sleeve 19, and a lower buffer chamber 11 is formed in the lower protective sleeve 19. When the piston rod 8 drives the lower hydraulic protection sealing assembly 13 to enter the lower buffer chamber 11, the oil is discharged from the lower buffer chamber 11 through the damping hole 20 to generate damping. Preferably, a gap 21 is also provided between the outer wall of the lower protective sleeve 19 and the inner wall of the working cylinder 7, so that the oil is discharged from the damping hole 20.

[0033] As Figure 3 shown, taking the following hydraulic protection seal assembly 13 as an example, both the upper hydraulic protection seal assembly 9 and the lower hydraulic protection seal assembly 13 include a seal block, a sealing ring (O-ring), and a snap ring. Among them, a sealing ring is provided on the inner walls at both the upper and lower ends of the seal block, and the sealing ring is used for corresponding sealing with the piston rod 8 or the hydraulic protection fixing rod 12. The snap ring is sleeved on the snap ring groove on the outer wall of the seal block to clamp the seal block tightly.

[0034] Furthermore, a spring disc 5 is installed on the outer wall of the upper part of the oil storage cylinder 6, and a knuckle bracket 17 is installed on the outer wall of the lower part of the oil storage cylinder 6.

[0035] The working process of the present utility model:

[0036] When the piston rod 8 reciprocates up and down due to the influence of road conditions of the vehicle, the moving components (i.e., the piston rod 8, the upper hydraulic protection seal assembly 9, the hydraulic protection fixing rod 12, and the lower hydraulic protection seal assembly 13) move up or down corresponding to the situations where the vehicle wheels jump down or up to the limit or near the limit. The upper hydraulic protection seal assembly 9 and the lower hydraulic protection seal assembly 13 on the piston rod 8 correspondingly enter the upper buffer cavity 4 and the lower buffer cavity 11. During the movement process, due to the changes in the movement speed and displacement, pressure is generated on the oil fluid. The oil fluid, under the action of the pressure, passes through the damping holes 20 on the side walls of the upper protective sleeve 18 or the lower protective sleeve 19, and damping is generated under the action of the upper hydraulic protection seal assembly 9 or the lower hydraulic protection seal assembly 13, thereby generating damping by controlling the oil fluid. The greater the movement speed, the greater the generated damping. This damping of the movement plays a role in suppressing the movement of the vehicle body, generating a limiting protection effect, and preventing part damage caused by impact at the limit position and negative impacts in terms of vehicle body control.

[0037] The damping force of the shock absorber with such a function can provide reliable comfort and handling control for the smooth driving of the whole vehicle, and the built-in hydraulic protection design structure can also provide effective impact protection at the limit of the up and down movement of the vehicle wheels, eliminating the bad noise and poor comfort in extreme working conditions.

[0038] After actual adoption, the impact and friction noises caused by the buffer blocks used in the traditional limiting protection of the vehicle can be avoided. The overall comfort of the vehicle is significantly improved, and the overall driving evaluation and NVH are improved by 8 - 40%. In addition, 2% - 10% of the space for the axial space layout of the vehicle single suspension is saved in terms of design.

[0039] It can be understood that for those skilled in the art, equivalent replacement or change of the technical solution and the inventive concept of the present utility model should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A shock absorber with an internal vehicle hydraulic protection structure, characterized in that, Comprising: An oil storage cylinder (6) sleeved outside the working cylinder (7). An end cover (1) is installed at the upper end of the oil storage cylinder (6) for pressing the oil seal (2) and the guide (3) against the upper opening of the working cylinder (7). A bottom cover (16) is installed at the lower end of the oil storage cylinder (6); A piston rod (8) slidably penetrating through the working cylinder (7). The upper end of the piston rod (8) penetrates through the end cover (1). A piston assembly (10) is installed at the lower part of the piston rod (8). And the lower end of the piston rod (8) passes through the piston assembly (10) and is fixedly connected to the hydraulic protection fixing rod (12). An upper hydraulic protection sealing assembly (9) is sleeved on the outer wall of the piston rod (8) above the piston assembly (10). A lower hydraulic protection sealing assembly (13) is sleeved on the outer wall of the hydraulic protection fixing rod (12); An upper protective sleeve (18) installed between the upper opening of the working cylinder (7) and the guide (3). A plurality of damping holes (20) are formed through the inner wall of the upper protective sleeve (18). An upper buffer cavity (4) is formed inside the upper protective sleeve (18). When the piston rod (8) drives the upper hydraulic protection sealing assembly (9) into the upper buffer cavity (4), the oil fluid is discharged from the upper buffer cavity (4) through the damping holes (20) to generate damping; A hydraulic protection bottom valve body (14) fixedly connected to the lower opening of the working cylinder (7) and installed on the shock absorber compression valve (15). The shock absorber compression valve (15) is arranged above the bottom cover (16). The upper end of the hydraulic protection bottom valve body (14) extends into the working cylinder (7); and A lower protective sleeve (19) installed at the upper end of the hydraulic protection bottom valve body (14). A plurality of damping holes (20) are also formed through the inner wall of the lower protective sleeve (19). A lower buffer cavity (11) is formed inside the lower protective sleeve (19). When the piston rod (8) drives the lower hydraulic protection sealing assembly (13) into the lower buffer cavity (11), the oil fluid is discharged from the lower buffer cavity (11) through the damping holes (20) to generate damping.

2. The shock absorber of the built-in vehicle hydraulic protection structure according to claim 1, characterized in that: A gap (21) is provided between the outer wall of the upper protective sleeve (18) and the inner wall of the working cylinder (7) for the oil fluid to be discharged from the damping holes (20).

3. The shock absorber of the built-in vehicle hydraulic protection structure according to claim 1, characterized in that: A gap (21) is provided between the outer wall of the lower protective sleeve (19) and the inner wall of the working cylinder (7) for the oil fluid to be discharged from the damping holes (20).

4. The shock absorber of the built-in vehicle hydraulic protection structure according to claim 1, characterized in that: A spring plate (5) is installed on the outer wall of the upper part of the oil storage cylinder (6).

5. The shock absorber of the built-in vehicle hydraulic protection structure according to claim 1, characterized in that: A knuckle bracket (17) is installed on the outer wall of the lower part of the oil storage cylinder (6).

6. The shock absorber of the built-in vehicle hydraulic protection structure according to claim 1, characterized in that: Both the upper hydraulic protection sealing assembly (9) and the lower hydraulic protection sealing assembly (13) include a sealing block, a sealing ring and a circlip. The sealing rings are arranged on the inner walls at the upper and lower ends of the sealing block for corresponding sealing with the piston rod (8) or the hydraulic protection fixing rod (12). The circlip is sleeved on the sealing block to clamp the sealing block tightly.

Images