Air spring structure

Abstract

The utility model discloses an air spring structure which comprises an end cover, a first piston and a leather bag connected between the end cover and the first piston, an air inlet is formed in the end cover, a limiting telescopic assembly is arranged in the leather bag, one end of the limiting telescopic assembly is fixedly installed at the inner end of the end cover, and the other end of the limiting telescopic assembly is fixedly installed at the outer end of the end cover. And the other end of the limiting telescopic assembly is rotationally mounted at the inner end of the piston I. The limiting telescopic assembly is arranged between the end cover in the leather bag and the piston I, so that when a shock absorber which is matched with the leather bag in operation fails or a piston connecting rod falls off, and a vehicle body is subjected to large vibration impact, the limiting telescopic assembly can be used for limiting the limiting telescopic assembly. The limiting telescopic assembly can limit the stretching length of the air spring, limit stretching damage and failure of the air spring are avoided, a vehicle swings in an amplitude mode, and a vehicle body is effectively prevented from rollover. And meanwhile, one end of the limiting telescopic assembly is rotationally connected relative to the first piston, so that the limiting telescopic assembly can adapt to radial deflection of the first piston relative to the end cover, normal operation of the air spring is not affected by arrangement of the limiting telescopic assembly, and the driving safety is improved while the service life of the air spring is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of shock-absorbing springs, in particular to an air spring structure. Background Art

[0002] An air spring is an ideal elastic element, its superior mechanical properties providing excellent ride comfort. Typically used in conjunction with shock absorbers in air suspension systems, air springs consist of end caps, a piston, and a rubber bladder connecting the two. If the shock absorber fails or the piston connecting rod falls off, the air spring, unconstrained in the radial direction, can easily fail due to extreme stretching when subjected to significant impact, potentially causing the vehicle to roll over. Utility Model Content

[0003] To this end, the present invention provides an air spring structure to solve the above-mentioned defects in the prior art.

[0004] An air spring structure includes an end cover, a piston and a bladder connected between the end cover and the piston. The end cover is provided with an air inlet, and a limited telescopic assembly is provided inside the bladder. One end of the limited telescopic assembly is fixedly mounted on the inner end of the end cover, and the other end of the limited telescopic assembly is rotatably mounted on the inner end of the piston.

[0005] Preferably, the limiting telescopic assembly includes a sleeve and a guide rod that moves axially along the inside of the sleeve, one end of the sleeve is fixedly mounted on the inner end of the end cover, and the other end of the sleeve is provided with a guide sleeve that is slid through by the guide rod, and the end of the guide rod located in the sleeve is provided with a limiting member that can be limited by the inner end surface of the guide sleeve, and the other end of the guide rod is rotatably mounted on the inner side of the piston.

[0006] Preferably, a positioning groove is formed at the inner end of the end cover, and a mounting block is installed at one end of the sleeve so as to be limitedly mounted at a position of the positioning groove. The mounting block is fixed in the positioning groove by a retaining spring.

[0007] Preferably, a positioning groove 2 is provided at the inner end of the piston 1, and a mounting block 2 is installed inside the positioning groove 2 through a retaining spring 1. A ball groove with an inner end opening is provided on the side of the mounting block 2 away from the piston 1, and a ball head that movably fits the ball groove is installed on the end of the guide rod away from the end cover.

[0008] Preferably, the limiting member is sleeved on the guide rod, and rubber washers are sleeved on both ends of the limiting member on the guide rod, and the two rubber washers and the limiting member therebetween are both limited relative to the guide rod.

[0009] Preferably, a bearing is sleeved at the center of the guide sleeve, and the bearing provides guidance for the radial sliding of the guide rod.

[0010] Preferably, the limiting member is a second piston that is in sliding engagement with the inner wall of the sleeve.

[0011] Preferably, the side walls of the upper and lower sections of the sleeve are both provided with an air hole that passes through the interior of the sleeve.

[0012] Preferably, a plurality of air holes 2 are provided on the piston 2 parallel to the axial direction of the sleeve.

[0013] Preferably, the upper end of the bladder and the end cover, as well as the lower end of the bladder and the piston are sealed and connected via buckles.

[0014] The utility model has the following advantages:

[0015] The utility model provides a limit telescopic assembly between the end cover and the piston inside the bladder. When the cooperating shock absorber fails or the piston connecting rod falls off and the vehicle body is subjected to a large vibration impact, the limit telescopic assembly can limit the stretching length of the air spring, thereby avoiding the air spring's ultimate stretching failure and causing the vehicle to swing with a certain amplitude, effectively preventing the vehicle body from rolling over. At the same time, one end of the limit telescopic assembly is rotatably connected relative to the piston, so that the limit telescopic assembly can adapt to the radial deflection of the piston relative to the end cover, so that the setting of the limit telescopic assembly will not affect the normal operation of the air spring, thereby increasing the service life of the air spring and also improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present utility model;

[0018] Figure 3 This is a schematic structural diagram of the position-limiting telescopic assembly of the present utility model;

[0019] Figure 4 This is a schematic cross-sectional view of the position-limiting telescopic assembly of the present invention;

[0020] Figure 5 This is a schematic diagram of the exploded structure of the position-limiting telescopic assembly of the present utility model;

[0021] Figure 6 For this utility model Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0022] In the picture:

[0023] 1-end cover; 101-positioning groove 1; 2-piston 1; 201-positioning groove 2; 3-skin bag; 4-limiting telescopic assembly; 5-retaining ring; 6-air inlet;

[0024] 401-sleeve; 402-guide rod; 403-piston 2; 404-guide sleeve; 405-mounting block 1; 406-mounting block 2; 407-ball head; 408-circlip 1; 409-circlip 2; 410-ball groove; 411-rubber washer; 412-limiting boss; 413-air hole 1; 414-air hole 2; 415-bearing. DETAILED DESCRIPTION

[0025] 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.

[0026] An air spring is an ideal elastic element, its superior mechanical properties providing excellent ride comfort. Typically used in conjunction with shock absorbers in air suspension systems, air springs consist of end caps, a piston, and a rubber bladder connecting the two. If the shock absorber fails or the piston connecting rod falls off, the air spring is radially unconstrained. Consequently, it can easily break due to extreme stretching and fail when the vehicle body is subjected to significant impact, potentially causing the vehicle to roll over.

[0027] Based on this, Figures 1 to 6 As shown, the present invention provides an air spring structure comprising an end cap 1, a piston 2, and a bladder 3 connected between the end cap 1 and the piston 2. The end cap 1 is provided with an air inlet 6. The upper end of the bladder 3 and the end cap 1, as well as the lower end of the bladder 3 and the piston 2, are both sealed by a retaining ring 5.

[0028] In addition, a limiting telescopic component 4 is provided inside the bladder 3, one end of the limiting telescopic component 4 is fixedly mounted on the inner end of the end cover 1, and the other end of the limiting telescopic component 4 is rotatably mounted on the inner end of the piston 2. When the shock absorber that cooperates with the air spring fails or the piston connecting rod falls off, the vehicle body is subjected to a large vibration impact. The limiting telescopic component 4 can prevent the air spring from being broken and failing due to extreme stretching, thereby avoiding the vehicle body from rolling over.

[0029] At the same time, one end of the position-limiting telescopic assembly 4 is rotatably connected relative to the piston 1 2 , so that the position-limiting telescopic assembly 4 can adapt to the radial deflection of the piston 1 2 relative to the end cover 1 . Therefore, the arrangement of the position-limiting telescopic assembly 4 will not affect the normal operation of the air spring.

[0030] In an embodiment of the present utility model, the limiting telescopic assembly 4 includes a sleeve 401 and a guide rod 402 that moves axially along the inside of the sleeve 401. One end of the sleeve 401 is fixedly installed on the inner end of the end cover 1, and the other end of the sleeve 401 is provided with a guide sleeve 404 that is slid through by the guide rod 402. The end of the guide rod 402 located in the sleeve 401 is installed with a limiting member that can be limited by the inner end surface of the guide sleeve 404, and the other end of the guide rod 402 is rotatably installed on the inner side of the piston 2.

[0031] In some embodiments, the ultimate stretching length of the position-limiting telescopic assembly 4 can be constrained by selecting the lengths of the sleeve 401 and the guide rod 402 .

[0032] In other embodiments, the ultimate stretching length of the position-limiting telescopic assembly 4 can be achieved by the installation position of the guide sleeve 404 on the sleeve 401. For example, the closer the installation is to one side of the end cover 1, the shorter the travel distance of the position-limiting member in the sleeve 401, and the shorter the ultimate stretching length of the position-limiting telescopic assembly 4. The specific adjustment is not limited to the above embodiment. By adjusting the ultimate stretching length of the position-limiting telescopic assembly 4, the swing amplitude of the vehicle body when the shock absorber fails or the piston connecting rod falls off can be adjusted (the swing amplitude preferably does not exceed 30°). For the same car, generally, the longer the ultimate stretching length of the position-limiting telescopic assembly 4, the greater the swing amplitude of the vehicle body when encountering the above problem, otherwise the swing amplitude is smaller.

[0033] In some embodiments, in order to reduce friction between the guide rod 402 and the guide sleeve 404 , a bearing 415 is provided in the center of the guide sleeve 404 . The bearing 415 provides guidance for radial sliding of the guide rod 402 .

[0034] In other embodiments (not shown in the figures), the guide sleeve 404 may also be an end wall integrally formed with the sleeve 401 to reduce assembly components, and a guide hole is provided on the end wall through which the guide rod 402 can slide.

[0035] In this embodiment of the present invention, the limiting member is mounted on the guide rod 402, and rubber washers 411 are mounted on both ends of the limiting member on the guide rod 402. The two rubber washers 411 and the limiting member therebetween are both limited relative to the guide rod 402. For example, the rubber washer 411 on the side closest to the guide sleeve 404 is limited by a limiting boss 412 on the guide rod 402, while the other rubber washer 411 is limited by a second retaining spring 409 mounted on the guide rod 402. The rubber washers 411 prevent the two sides of the limiting member from hard collision with the contact member when the limiting member reaches the ends of the travel, thereby reducing mechanical damage, extending the service life, and reducing noise during structural operation.

[0036] In some embodiments, the limiting member may not be in contact with the inner wall of the sleeve 401 , and may only serve to limit the stretching length of the limiting telescopic assembly 4 .

[0037] In the embodiment of the present invention, the position-limiting member is a second piston 403 that slides with the inner wall of the sleeve 401. This arrangement has the advantage that the guide rod 402 can be supported by both the second piston 403 and the guide sleeve 404, thereby preventing the guide rod 402 from swinging during operation and improving the stability of the position-limiting telescopic assembly 4.

[0038] In the embodiment of the present invention, the side walls of the upper and lower sections of the sleeve 401 are both provided with an air hole 413 that passes through the interior of the sleeve 401 to reduce the gas resistance of the piston 403 in the sleeve 401 as it moves along the guide rod 402.

[0039] Preferably, a plurality of second air holes 414 are provided on the second piston 403 parallel to the axial direction of the sleeve 401 to promote the circulation of air in the sleeve 401 and further improve the stability of the operation of the limiting telescopic assembly 4.

[0040] In the embodiment of the present invention, a positioning groove 101 is provided at the inner end of the end cover 1, and a mounting block 405 that can be limitedly mounted in the positioning groove 101 is installed at one end of the sleeve 401, and the mounting block 405 is fixed in the positioning groove 101 by a retaining spring 408.

[0041] In an embodiment of the present utility model, a positioning groove 201 is provided at the inner end of the piston 2, and a mounting block 406 is installed inside the positioning groove 201 through a retaining spring 408. A ball groove 410 with an inner end opening is provided on the side of the mounting block 406 away from the piston 2, and a ball head 407 that movably fits the ball groove 410 is installed on the end of the guide rod 402 away from the end cover 1, so that the limiting telescopic assembly 4 can adapt to the radial deflection of the piston 2 relative to the end cover 1.

[0042] When the air spring structure of the present invention works normally with the shock absorber (not shown in the figure), when the vehicle body vibrates, the guide rod 402 moves relative to the sleeve 401 to adapt to the change in the distance between the piston 2 and the end cover 1. When the piston 2 deflects radially relative to the end cover 1, the ball head 407 at one end of the guide rod 402 rotates relative to the ball groove 410 on the side of the piston 2 to adapt to the angular deflection, and the air spring normally performs its shock absorption function.

[0043] When the shock absorber that cooperates with the air spring structure fails or the piston connecting rod falls off, the air spring structure acts alone, the vehicle is subjected to vibration and impact, and the body shakes and tends to roll over. The limit telescopic assembly 4 will limit the stretching of the air spring to the limit state. On the one hand, it can prevent the further separation of the piston 1 and the end cover, which may cause the air spring structure to break and fail, thereby increasing its service life; on the other hand, the tight tension of the limit telescopic assembly can prevent the body from further rolling over, thereby improving driving safety.

[0044] To sum up, the utility model provides a limit telescopic assembly between the end cover and the piston inside the bladder. When the cooperating shock absorber fails or the piston connecting rod falls off and the vehicle body is subjected to a large vibration impact, the limit telescopic assembly can limit the stretching length of the air spring, avoid the air spring's extreme stretching failure, and cause the vehicle to swing with a certain amplitude, effectively preventing the vehicle body from rolling over. At the same time, one end of the limit telescopic assembly is rotatably connected relative to the piston, so that the limit telescopic assembly can adapt to the radial deflection of the piston relative to the end cover, so that the setting of the limit telescopic assembly will not affect the normal operation of the air spring, thereby improving the service life of the air spring and also improving driving safety.

[0045] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

Claims

1. An air spring structure, comprising an end cover (1), a piston (2), and a bladder (3) connected between the end cover (1) and the piston (2), wherein the end cover (1) is provided with an air inlet (6), and is characterized in that: A limited telescopic assembly (4) is provided inside the bladder (3), one end of the limited telescopic assembly (4) is fixedly mounted on the inner end of the end cover (1), and the other end of the limited telescopic assembly (4) is rotatably mounted on the inner end of the piston (2).

2. The air spring structure according to claim 1, characterized in that: The position-limiting telescopic assembly (4) comprises a sleeve (401) and a guide rod (402) that moves axially along the interior of the sleeve (401); one end of the sleeve (401) is fixedly mounted on the inner end of the end cover (1); the other end of the sleeve (401) is provided with a guide sleeve (404) that is slidably penetrated by the guide rod (402); one end of the guide rod (402) located in the sleeve (401) is provided with a position-limiting member that can be limited by the inner end surface of the guide sleeve (404); the other end of the guide rod (402) is rotatably mounted on the inner side of the piston (2).

3. The air spring structure according to claim 2, characterized in that: A positioning groove (101) is provided at the inner end of the end cover (1), and a mounting block (405) capable of being limitedly mounted in the positioning groove (101) is installed at one end of the sleeve (401), and the mounting block (405) is fixed in the positioning groove (101) by a retaining spring (408).

4. The air spring structure according to claim 2, characterized in that: The inner end of the piston (2) is provided with a positioning groove (201), and the interior of the positioning groove (201) is provided with a mounting block (406) via a retaining spring (408). The side of the mounting block (406) away from the piston (2) is provided with a ball groove (410) with an inner end opening, and the end of the guide rod (402) away from the end cover (1) is provided with a ball head (407) that movably fits the ball groove (410).

5. The air spring structure according to claim 2, characterized in that: The limiting member is sleeved on the guide rod (402), and rubber washers (411) are sleeved on both ends of the limiting member on the guide rod (402), and the two rubber washers (411) and the limiting member therebetween are both limited relative to the guide rod (402).

6. The air spring structure according to claim 2, characterized in that: A bearing (415) is sleeved at the center of the guide sleeve (404), and the bearing (415) provides guidance for the radial sliding of the guide rod (402).

7. An air spring structure according to claim 2 or 5, characterized in that: The limiting member is a second piston (403) that is slidably matched with the inner wall of the sleeve (401).

8. The air spring structure according to claim 2, characterized in that: The side walls of the upper and lower sections of the sleeve (401) are both provided with an air hole (413) that passes through the interior of the sleeve (401).

9. The air spring structure according to claim 7, characterized in that: The second piston (403) is provided with a plurality of second air holes (414) parallel to the axial direction of the sleeve (401).

10. The air spring structure according to claim 1, characterized in that: The upper end of the bladder (3) and the end cover (1) as well as the lower end of the bladder (3) and the piston (2) are sealed and connected via a buckle (5).

Images