Air spring upper end cover

Abstract

The invention discloses an upper end cover of an air spring, relates to the technical field of vibration reduction of automobile air suspensions, and solves the problem of short fatigue life of an existing air spring. The end cover comprises an end cover main body, the end cover main body is internally provided with a cavity, the top of the cavity is provided with an insertion hole, the bottom of the cavity is open, and the lower end of the end cover main body is provided with a connecting end; the bottom of the upper supporting disc protrudes downwards to form an insertion part connected with the insertion hole in an inserted mode, and a through hole is formed in the middle of the insertion part; the vibration isolation block is fixed between the upper supporting disc and the end cover main body and is arranged on the periphery of the inserting part in a surrounding manner; and the sealing cover is arranged at the upper end of the through hole in a sealing manner. The vibration isolation block can counteract part of vibration force, so that impact force borne by a vehicle body and a leather bag of the air spring is greatly reduced, it is guaranteed that riding stability is improved, meanwhile, loss of the leather bag of the air spring is reduced, and the service life of the air spring is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of automobile air suspension vibration reduction, in particular to an upper end cover of an air spring. Background Art

[0002] Air suspension has long been a highlight of high-end passenger cars, greatly improving ride comfort. With the rise of new energy vehicles in China, air suspension has also been widely used in high-end and mid-range models. As the actuator of air suspension, air springs play a major role in vibration reduction. The core component of the air spring, the bladder, is mainly made of rubber and cord vulcanized. Limited by the durability of domestic rubber itself, the fatigue life of air springs made from domestic rubber formulas is also much lower than the advanced foreign level. In the process of long-term flexural motion of the air spring bladder following the piston, the expandability and fatigue resistance will decrease, resulting in a shorter fatigue life of the air spring, which to a certain extent restricts the rapid promotion of air suspension models. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problem and to design an upper end cover of an air spring to solve the problem of short fatigue life of the existing air spring.

[0004] To achieve the above object, the technical solution of the present invention is an air spring upper end cover, comprising: An end cover body, wherein the end cover body has a cavity, the top of the cavity has a plug hole, the bottom of the cavity is open, and the lower end of the end cover body has a connecting end for connecting with the bladder of the air spring; An upper support plate, wherein the bottom of the upper support plate protrudes downward to form a plug-in portion plugged into the plug hole, and a through hole is provided in the middle of the plug-in portion; A vibration isolation block, which is fixed between the upper support plate and the end cover body and is arranged around the periphery of the plug-in portion; A sealing cover is sealingly arranged at the upper end of the through hole to seal the high-pressure gas inside the air spring.

[0005] Furthermore, the vibration isolation block is respectively connected to the upper support plate and the end cover body by vulcanization.

[0006] Furthermore, a plurality of connecting studs for connecting to the vehicle body are embedded on the upper support plate, and the heads of the connecting studs are vulcanized and connected to the vibration isolation blocks.

[0007] Furthermore, the bottom edge of the upper support plate protrudes downward to form a retaining ring, and the retaining ring is used to prevent the vibration isolation block from sliding out of the upper support plate.

[0008] Furthermore, the vibration isolation block wraps the top of the end cover body, and the portion of the top surface of the end cover body that contacts the vibration isolation block bulges upward to increase the bearing capacity.

[0009] Furthermore, the middle of the sealing cover is convex upward to form a dome top, and the bottom of the dome top has an avoidance cavity for facilitating the up and down movement of the shock absorber connecting rod.

[0010] Furthermore, the periphery of the dome top on the sealing cover is provided with a circle of grooves, a plurality of reinforcing ribs are arranged in the grooves, and the reinforcing ribs are distributed around the periphery of the dome top.

[0011] Furthermore, a support plate is provided on the inner side of the through hole, a through hole is provided in the middle of the support plate, and an installation groove is formed on the inner side of the plug-in portion below the support plate, and the installation groove is used to install a limit block.

[0012] Furthermore, a top rubber is installed between the sealing cover and the support plate, and the top rubber includes a top rubber outer ring and a top rubber inner core arranged on the inner periphery of the top rubber outer ring, the top rubber outer ring and the top rubber inner core are vulcanized and connected by buffer rubber, an inner core center hole is opened in the middle of the top rubber inner core, and a plurality of inner core side holes are opened around the inner core center hole, and the inner core side holes are used to connect the upper and lower spaces of the top rubber inner core.

[0013] Furthermore, an air hole insert is arranged on the outer side of the end cover body, an air hole connected to the cavity is arranged on the inner side of the air hole insert, and an air hole thread for connecting to the air inlet nozzle is arranged at one end of the air hole insert.

[0014] Compared with the prior art, the beneficial effects are: In the present invention, the lower end of the shock absorber will be connected to the piston of the air spring, the upper connecting rod will pass through the top rubber in the middle of the plug-in part, the upper support plate will be connected to the vehicle body, and the vibration isolation block will be located between the upper support plate and the end cover body, and the vibration isolation block plays a role in vibration reduction. When the air spring is working, the bearing capacity of the air spring is mainly concentrated on the end cover body. During the driving of the vehicle, the end cover body will transmit force to the vibration isolation block as the air spring piston vibrates up and down. The vibration isolation block will offset part of the vibration force, and then continue to transmit the weakened vibration force to the vehicle body. This process of offsetting the vibration force greatly reduces the impact force on the vehicle body and the bladder of the air spring. While ensuring the improvement of riding stability, it can also reduce the loss of the air spring bladder, thereby extending the service life of the air spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structural diagram of the upper end cover of the air spring of the present invention; Figure 2 yes Figure 1 A magnified view of the structure at center.

[0016] In the figure, 1. O-ring; 2. sealing cover; 21. dome top; 201. external thread; 202. avoidance cavity; 203. reinforcing rib; 3. upper support plate; 31. plug-in part; 311. support plate; 3111. center hole; 301. connecting stud; 30101. head; 302. mounting groove; 303. mounting hole; 304. retaining ring; 4. vibration isolation block; 5. end cover body; 501. anti-slip line; 502. cavity; 6. air hole insert; 601. air hole thread; 7. top glue; 701. buffer rubber; 702. top glue inner core; 70201. inner core middle hole; 70202. inner core side hole; 703. top glue outer ring. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a preferred embodiment of the present invention provides an upper end cover of an air spring, which is used on an air spring. The upper end cover mainly includes an end cover body 5, an upper support plate 3, a vibration isolation block 4, a sealing cover 2, an air hole insert 6, a top rubber 7 and other components.

[0019] The inside of the end cap body 5 has a cavity 502, the lower end of which is open and is used to communicate with the bladder of the air spring. A socket is provided at the top of the cavity 502, which is used to connect with the upper support plate 3.

[0020] See also Figure 1 The bottom center of the upper support plate 3 is convex downward to form a circle of surrounding walls, which is the plug-in portion 31, used to plug into the plug hole on the end cover body 5. There is a through hole that runs through the middle of the plug-in portion 31, and the sealing cover 2 seals and presses the top glue 7 to fix it in the through hole. A support plate 311 is formed on the inner side of the plug-in portion 31 to support the top glue 7.

[0021] The vibration isolation block 4 is located between the upper support plate 3 and the end cover body 5, and is distributed around the periphery of the plug-in portion 31. The periphery of the vibration isolation block 4 is recessed inward. The vibration isolation block 4 is vulcanized and connected to the upper support plate 3 and the end cover body 5, respectively. The vibration isolation block 4 is made of rubber and plays a role in vibration reduction. When the bladder of the air spring is compressed, the high-pressure gas will impact the end cover body 5. At this time, the impact force will be absorbed by the vibration isolation block 4. On the premise of improving the vibration reduction performance, the deformation stress of the bladder is reduced, thereby improving the fatigue resistance of the bladder, and then improving the service life of the air spring.

[0022] Continue to see Figure 1The outer edge of the bottom of the upper support plate 3 protrudes downward to form a circle of retaining ring 304, which is used to prevent the vibration isolation block 4 from slipping out from between the upper support plate 3 and the end cover body 5. The top surface of the end cover body 5 and the part in contact with the vibration isolation block 4 protrude upward to form an arched surface. As the end cover body 5 vibrates up and down with the air spring piston, the bladder will transmit the vibration force to the end cover body 5, and then the vibration isolation block 4 will absorb and offset part of the vibration force, and then the weakened vibration force will continue to be transmitted to the vehicle body through the upper support plate 3. The vibration isolation block 4 completely wraps the upper surface of the end cover body 5. Under the impact of high-pressure gas, the end cover body 5 will squeeze the vibration isolation block 4. The arched surface will increase the strength of this part and provide greater bearing capacity, making the part in contact with the vibration isolation block 4 less likely to deform.

[0023] The through hole in the middle of the plug-in portion 31 is divided into three layers: upper, middle and lower. The upper layer is installed with the sealing cover 2, the middle layer is installed with the top glue 7, and the lower layer is installed with the limit block.

[0024] refer to Figure 1 , the top rubber 7 is installed in the middle layer of the through hole. The top rubber 7 is mainly composed of three parts, namely, the top rubber outer ring 703, the buffer rubber 701 and the top rubber inner core 702. The top rubber outer ring 703 is located in the outermost layer, and the top rubber inner core 702 is located in the innermost layer, that is, in the middle. The buffer rubber 701 is located between the top rubber outer ring 703 and the top rubber inner core 702, and the two are vulcanized and connected together. The buffer rubber 701 plays a buffering role and provides damping force for the top rubber inner core 702 to vibrate up and down.

[0025] Specifically, the top rubber outer ring 703 is arranged on the periphery of the buffer rubber 701, and there is a hole that passes through the buffer rubber 701 from top to bottom in the middle, and there is a circle of grooves on the inner wall of the hole. The top rubber inner core 702 is installed in the hole, and the outer periphery of the top rubber inner core 702 is embedded in the groove, and the top rubber inner core 702 is limited and fixed by the groove.

[0026] The center of the top rubber core 702 has an inner core middle hole 70201 that runs through from top to bottom. The top rubber 7 middle hole is concentric with the center hole 3111 on the lower support plate 311. The shock absorber connecting rod passes through the inner core middle hole 70201, and the top rubber 7 and the shock absorber connecting rod are connected together by locking the nut. There are multiple inner core side holes 70202 distributed around the inner core middle hole 70201, so as to connect the spaces on the upper and lower sides of the top rubber core 702, so that the pressure of the spaces on both sides is balanced.

[0027] The sealing cover 2 is installed at the uppermost layer of the through hole on the plug-in portion 31. A sealing groove is provided on the outer side of the sealing cover 2, and the sealing groove cooperates with the upper support plate 3 through the O-ring 1 to form a sealing surface. The outer peripheral surface of the sealing cover 2 is provided with an external thread 201, and the upper side of the through hole is provided with an internal thread. The external thread 201 and the internal thread cooperate to connect the sealing cover 2 and the upper support plate 3.

[0028] The middle of the sealing cover 2 is convex upward to form a dome top 21, so that an avoidance cavity 202 is formed at the bottom of the sealing cover 2. The upper end of the shock absorber connecting rod will pass through the central hole 3111 and the inner core middle hole 70201. The avoidance cavity 202 can increase the upward and downward activity space of the shock absorber connecting rod. A circle of grooves is formed on the periphery of the dome top 21, and a number of reinforcing ribs 203 are arranged in the groove. The reinforcing ribs 203 are vertically arranged and evenly distributed along the circumference of the dome top 21 to strengthen the strength of the sealing cover 2. At the same time, the threads of the sealing cover 2 can be tightened in the threaded holes of the upper support plate 3 through special tooling.

[0029] The limit block is installed at the bottom layer of the through hole. A groove, namely the mounting groove 302, is formed on the inner side of the plug-in portion 31 below the support plate 311 for mounting the limit block. The limit block is used to limit the upward movement of the shock absorber. The limit block is made of elastic material and can play a buffering role for the shock absorber.

[0030] The lowermost end of the side wall of the installation groove 302 is provided with an undercut for holding and fixing the limit block in the installation groove 302 to prevent the limit block from sliding out.

[0031] like Figure 1 As shown, a pore insert 6 is embedded on the outer side of the end cap body 5, and the inner side of the pore insert 6 has a through pore, which is used to inflate the cavity 502. A pore thread 601 is provided at one end of the pore insert 6, and the pore thread 601 is located on the inner side of the pore and can be used to connect the air inlet nozzle. The other end of the pore insert 6 is connected to the end cap body 5 and welded together, and the welding part ensures that the high-pressure gas can be sealed.

[0032] The lower end of the end cover body 5 has a connection end for connecting with the bladder of the air spring. A circle of anti-skid wire 501 is arranged on the periphery of the connection end, and the anti-skid wire 501 is assembled with the bladder of the air spring to form a sealing surface, and can increase the friction between the bladder and the end cover body 5 to prevent the bladder from sliding off the end cover body 5.

[0033] The lowermost end of the end cap body 5 will be appropriately expanded outward to form a circle of protrusions, and after the bladder is wrapped around the connection end of the end cap body 5, the bladder can be clamped on the connection end of the end cap body 5 through the sealing ring. The protrusion can prevent the sealing ring from falling off.

[0034] like Figure 1 and Figure 2As shown, a plurality of connecting studs 301 are embedded on the upper support plate 3, and the upper support plate 3 can be connected to the vehicle body through the connecting studs 301. Correspondingly, the upper support plate 3 has a plurality of mounting holes 303, and the connecting studs 301 are interference fit with the mounting holes 303. The heads 30101 of the connecting studs 301 are embedded in the vibration isolation block 4 and vulcanized with the vibration isolation block 4. The rods of the connecting studs pass through the upper support plate 3 so as to be connected to the vehicle body.

[0035] When the air spring is working, the bearing capacity of the air spring is mainly concentrated on the end cover body 5. During the driving process of the vehicle, the end cover body 5 transmits force to the vibration isolation block 4 as the air spring piston vibrates up and down. The vibration isolation block 4 will offset part of the vibration force, and then continue to transmit the weakened vibration force to the vehicle body. This process of offsetting the vibration force greatly reduces the impact force on the vehicle body and the air spring bladder, so that the impact stress on the bladder will be reduced and the fatigue resistance will be improved. While ensuring the improvement of ride stability, it can also reduce the loss of the air spring bladder and extend the service life of the air spring.

[0036] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. An air spring upper end cover, characterized in that: include: An end cover body (5), wherein the end cover body (5) has a cavity (502) therein, the top of the cavity (502) has a plug hole, the bottom of the cavity (502) is open, and the lower end of the end cover body (5) has a connection end for connecting to a bladder of an air spring; An upper support plate (3), the bottom of the upper support plate (3) protruding downwards to form a plug-in portion (31) plugged into the plug hole, and a through hole in the middle of the plug-in portion (31); A vibration isolation block (4), the vibration isolation block (4) being fixed between the upper support plate (3) and the end cover body (5) and being arranged around the periphery of the plug-in portion (31); A sealing cover (2) is sealingly arranged at the upper end of the through hole to seal the high-pressure gas inside the air spring.

2. The air spring upper end cover according to claim 1, characterized in that: The vibration isolation block (4) is respectively connected to the upper support plate (3) and the end cover body (5) by vulcanization.

3. The air spring upper end cover according to claim 1, characterized in that: The upper support plate (3) is inlaid with a plurality of connecting studs (301) for connecting to the vehicle body, and the heads (30101) of the connecting studs (301) are vulcanized and connected to the vibration isolation block (4).

4. The air spring upper end cover according to claim 1, characterized in that: The bottom edge of the upper support plate (3) protrudes downward to form a retaining ring (304), and the retaining ring (304) is used to prevent the vibration isolation block (4) from sliding out of the upper support plate (3).

5. The air spring upper end cover according to claim 1, characterized in that: The vibration isolation block (4) wraps the top of the end cover body (5), and the portion of the top surface of the end cover body (5) that contacts the vibration isolation block (4) is convex upward to increase the bearing capacity.

6. The air spring upper end cover according to claim 1, characterized in that: The middle of the sealing cover (2) is convex upward to form a dome top (21), and the bottom of the dome top (21) is provided with an avoidance cavity (202) for facilitating the upward and downward movement of the shock absorber connecting rod.

7. The air spring upper end cover according to claim 6, characterized in that: The dome top (21) on the sealing cover (2) has a circle of grooves on its periphery, and a plurality of reinforcing ribs (203) are arranged in the grooves. The reinforcing ribs (203) are distributed around the periphery of the dome top (21).

8. The air spring upper end cover according to claim 1, characterized in that: A support plate (311) is arranged on the inner side of the through hole, a through hole is provided in the middle of the support plate (311), and a mounting groove (302) is formed on the inner side of the plug-in portion (31) below the support plate (311), and the mounting groove (302) is used for mounting a limit block.

9. The air spring upper end cover according to claim 8, characterized in that: A top rubber (7) is installed between the sealing cover (2) and the support plate (311), and the top rubber (7) includes a top rubber outer ring (703) and a top rubber inner core (702) arranged inside the top rubber outer ring (703), the top rubber outer ring (703) and the top rubber inner core (702) are vulcanized and connected via a buffer rubber (701), an inner core center hole (70201) is opened in the middle of the top rubber inner core (702), and a plurality of inner core side holes (70202) are opened around the inner core center hole (70201), and the inner core side holes (70202) are used to connect the upper and lower spaces of the top rubber inner core (702).

10. The air spring upper end cover according to claim 1, characterized in that: An air hole insert (6) is arranged on the outer side of the end cover body (5), and an air hole connected to the cavity (502) is arranged on the inner side of the air hole insert (6), and an air hole thread (601) for connecting to the air inlet nozzle is arranged at one end of the air hole insert (6).

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