Rubber-coated piston with flow control groove

Abstract

The utility model provides a rubber-coated piston with a flow control groove, and belongs to the technical field of shock absorbers. The first check ring and the second check ring are arranged on the piston body with the inner side damping hole and the outer side damping hole, and the inner side damping hole and the outer side damping hole are separated by the first check ring and the second check ring on the outer surface and the inner surface of the barrel bottom of the piston body respectively. The first check ring and the second check ring are each provided with a plurality of flow control holes, each inner side damping hole and each outer side damping hole correspond to a flow control groove, communication of the inner space and the outer space of the first check ring and the inner space and the outer space of the second check ring is achieved through the flow control grooves, and therefore the first check ring and the second check ring can provide position accuracy for installation and use of the valve plate; the flow of the damping oil can be realized when the deformation of the valve plate is small, and the flow rate of the damping oil can be increased, so that the reaction sensitivity of the damper is improved, the damping effect is better, and the use performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shock absorber, concretely relates to a rubber coated piston with flow control groove. BACKGROUND

[0002] As the key structure in the automobile suspension system, the automobile shock absorber can effectively weaken the impact vibration, make the automobile ride more smoothly, and improve the driving comfort. At present, the existing automobile shock absorber on the market usually includes a cylinder, a piston rod, a piston, etc. The piston is slidingly arranged in the cylinder, one end of the piston rod extends into the cylinder and is fixedly connected with the piston. Meanwhile, a plurality of damping holes are formed in the piston, and the damping holes are divided into two groups. Valve pieces are installed on the two groups of damping holes, and the opening directions of the valve pieces corresponding to the two groups of damping holes are opposite. Therefore, when the piston slides in the cylinder, the opening and closing actions of the valve pieces of different groups balance the flow of damping oil at both ends of the piston, and the piston provides resistance through the damping oil to achieve the purpose of shock absorption. Therefore, the structure of the piston is directly related to the performance of the shock absorber.

[0003] At present, the existing rubber coated piston on the market, such as the rubber coated piston for shock absorber disclosed in patent CN217381421U, includes a piston body and a piston collar. The piston collar is arranged on the outside of the piston body. A clamping groove is reserved on the outer side wall of the piston. An installation clamping block is installed in the inside of the clamping groove reserved on the inner side wall of the piston collar. The installation clamping block and the clamping groove are connected by relative position clamping to avoid the piston collar from being dislocated under the action of friction during the sliding process of the piston in the cylinder, thereby improving the stability and reliability of the structure of the piston collar after being sleeved on the piston body, and maintaining the normal function of the piston. However, since the two groups of damping holes formed in the piston are arranged on the inside and outside of the piston body, and are separated by a check ring, when the corresponding valve pieces are installed on the piston body, the edges of the valve pieces in the closed state are embedded in the space surrounded by the check ring to maintain the accuracy of the position of the valve pieces during installation and use, and to ensure that the valve pieces can still effectively act on the corresponding damping holes after a long period of use. When the valve pieces need to be opened, one side of the valve pieces is slightly raised to open the corresponding damping holes and meet the flow demand of the damping oil. However, since the edges of the valve pieces are embedded in the space surrounded by the check ring, when one side of the valve pieces is slightly raised, the valve pieces need to completely protrude outside the check ring to make the damping oil flow, that is, the valve pieces need to be greatly deformed to meet the use demand, which causes the problem of slow reaction and affects the performance of the shock absorber. SUMMARY

[0004] In view of the above problems existing in the prior art, the present application provides a rubber-coated piston with a flow control groove, which is provided with a through flow control groove on the piston body and on the stop ring corresponding to the damping hole, so that the space inside and outside the stop ring is connected through the flow control groove, so that the stop ring structure can be maintained on the piston body, the position accuracy of the valve plate during installation and use is maintained, and the shock-absorbing oil can flow when the valve plate deforms slightly. The flow of the shock-absorbing oil is improved through the flow control groove, the reaction sensitivity is better, the shock-absorbing effect is better, and the use performance is ensured.

[0005] The specific technical solutions are as follows:

[0006] A rubber-coated piston with a flow control groove, comprising a piston body and a rubber-coated ring, the rubber-coated ring being sleeved on the outer sidewall of the piston body, characterized in that the piston body is arranged in a barrel shape, a through center installation hole, a plurality of inner damping holes and a plurality of outer damping holes are formed in the barrel bottom of the piston body, the center installation hole is located at the axis of the piston body, the plurality of inner damping holes and the plurality of outer damping holes are arranged in a ring array with the axis of the center installation hole as the center, and the plurality of inner damping holes and the plurality of outer damping holes are alternately arranged, and a first stop ring is arranged on the outer surface of the barrel bottom of the piston body, the plurality of inner damping holes and the plurality of outer damping holes are located on the inner side and the outer side of the first stop ring, respectively, and a second stop ring is arranged on the inner surface of the barrel bottom of the piston body and located at the hole opening of each outer damping hole, and a plurality of flow control grooves are formed in the first stop ring and located at each inner damping hole and in the second stop ring and located at each outer damping hole.

[0007] The rubber-coated piston with a flow control groove, wherein flow control grooves are arranged on both sides of each outer damping hole and inner damping hole.

[0008] The rubber-coated piston with a flow control groove, wherein a plurality of ring-shaped positioning grooves are formed in the outer sidewall of the piston body along the axial direction, the plurality of ring-shaped positioning grooves are arranged at intervals along the axial direction of the piston body, a plurality of ring-shaped matching convex edges are arranged on the inner sidewall of the rubber-coated ring along the circumferential direction, the plurality of ring-shaped matching convex edges are arranged at intervals along the axial direction of the rubber-coated ring, and when the rubber-coated ring is sleeved on the piston body, the plurality of ring-shaped matching convex edges and the plurality of ring-shaped positioning grooves are embedded one by one.

[0009] The rubber-coated piston with a flow control groove, wherein the rubber-coated ring and the piston body are connected by injection molding.

[0010] The rubber-coated piston with a flow control groove, wherein an outer connecting thread is arranged on the outer sidewall of the piston body along the axial direction, and an inner connecting thread matched with the outer connecting thread is arranged on the inner sidewall of the rubber-coated ring along the axial direction.

[0011] The encapsulated piston with the flow control groove, wherein a limiting ring groove is formed on the outer side wall of the piston body and located at the side of the outer connecting thread close to the barrel bottom, and the end of the encapsulating ring close to the barrel bottom of the piston body is provided with a skirt extending into the limiting ring groove.

[0012] The encapsulated piston with the flow control groove, wherein an end limiting ring is arranged at one end of the barrel mouth of the piston body, and the outer diameter of the end limiting ring is larger than the inner diameter of the inner connecting thread.

[0013] The encapsulated piston with the flow control groove, wherein a plurality of first connecting blocks are arranged on the inner side wall of the barrel mouth of the piston body, a plurality of second connecting blocks corresponding to the first connecting blocks are arranged on the inner side wall of the end limiting ring, and the first connecting blocks and the second connecting blocks are detachably connected.

[0014] The encapsulated piston with the flow control groove, wherein a bayonet is arranged on one side of the first connecting block and along the circumferential direction of the piston body, and the second connecting block is a clamping leg matched with the bayonet.

[0015] The encapsulated piston with the flow control groove, wherein a first locking hole is arranged on the first connecting block and along the axial direction of the piston body, a second locking hole corresponding to the first locking hole is arranged on the second connecting block, and a locking screw is arranged between the first locking hole and the second locking hole.

[0016] The positive effect of the above technical solution is:

[0017] The encapsulated piston with the flow control groove, wherein a plurality of inner side damping holes and a plurality of outer side damping holes are arranged on the barrel bottom of the piston body, a first retaining ring is arranged on the outer surface of the barrel bottom of the piston body and separates the plurality of inner side damping holes and the plurality of outer side damping holes, a second retaining ring is arranged on the inner surface of the barrel bottom of the piston body and located at the hole opening of each outer side damping hole, and a plurality of flow control grooves are arranged on the first retaining ring and located at each inner side damping hole and on the second retaining ring and located at each outer side damping hole. The flow control grooves can realize the communication between the inner and outer spaces of the retaining rings, so that the retaining ring structure can be maintained on the piston body to maintain the position accuracy of the valve plate during installation and use, the flow of damping oil can be realized when the valve plate deforms slightly, the flow of damping oil can be improved through the flow control grooves, the reaction sensitivity is improved, and the damping effect is improved, so that the use performance is better. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure diagram of the encapsulated piston with the flow control groove according to the embodiment of the utility model;

[0019] Figure 2A sectional view of one embodiment of the rubber-coated piston with a flow control groove of the utility model;

[0020] Figure 3 A sectional view of another embodiment of the rubber-coated piston with a flow control groove of the utility model.

[0021] In the drawings: 1, piston body; 11, center mounting hole; 12, inner side damping hole; 13, outer side damping hole; 14, first blocking ring; 15, second blocking ring; 16, annular positioning groove; 17, outer connecting thread; 18, limiting annular groove; 19, first connecting block; 141, flow control groove; 191, bayonet; 192, first locking hole; 2, rubber-coated ring; 21, annular matching ridge; 22, inner connecting thread; 23, skirt; 3, end limiting ring; 31, second connecting block; 311, second locking hole; 4, locking screw. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the following embodiments are combined with the accompanying drawings to illustrate the utility model. Figure 1 to the accompanying drawings Figure 3 The technical scheme of the utility model is described in detail, but the following content is not limited to the utility model.

[0023] Figure 1 The structure of the embodiment of the rubber-coated piston with a flow control groove of the utility model is shown in the drawings. Figure 1 As shown in the drawings, the rubber-coated piston with a flow control groove provided by the embodiment includes: a piston body 1 and a rubber-coated ring 2, and the rubber-coated ring 2 is sleeved on the outer side wall of the piston body 1, which is used for the structure of the piston body 1 contacting the inner wall of the cylinder.

[0024] Specifically, the piston body 1 is arranged in a barrel shape, so that a large fitting area is formed between the piston body 1 and the inner wall of the cylinder. Meanwhile, a through central mounting hole 11 and a plurality of inner side damping holes 12 and outer side damping holes 13 are formed in the bottom of the barrel of the piston body 1. The central mounting hole 11 is located at the center of the piston body 1, and the piston rod is fixedly connected through the central mounting hole 11. Meanwhile, the plurality of inner side damping holes 12 and outer side damping holes 13 are arranged in a ring array around the axis of the central mounting hole 11, so that the inner side damping holes 12 and outer side damping holes 13 are uniformly distributed on the bottom of the barrel of the piston body 1, ensuring uniform stress and maintaining the stability of the structure during use. In addition, the plurality of inner side damping holes 12 and outer side damping holes 13 are alternately distributed, so that the space between adjacent inner side damping holes 12 and outer side damping holes 13 is utilized, thereby increasing the diameter of the inner side damping holes 12 and outer side damping holes 13 in a small space, making the shock-absorbing oil flow faster, the response more sensitive, and the shock-absorbing effect better. Furthermore, a first stop ring 14 is arranged on the outer surface of the bottom of the barrel of the piston body 1. At this time, the plurality of inner side damping holes 12 and outer side damping holes 13 are located on the inner side and outer side of the first stop ring 14, respectively, that is, the plurality of inner side damping holes 12 are surrounded by the first stop ring 14 on the inner side, and the plurality of outer side damping holes 13 are located on the outer side of the first stop ring 14, so that the first stop ring 14 separates the inner side damping holes 12 and outer side damping holes 13 on the outer surface of the bottom of the barrel, providing conditions for maintaining the independence of the functions of the inner side damping holes 12 and outer side damping holes 13. Meanwhile, a second stop ring 15 is arranged on the inner surface of the bottom of the barrel of the piston body 1 and located at the opening of each outer side damping hole 13, so that the second stop ring 15 separates the inner side damping holes 12 and outer side damping holes 13 on the inner surface of the bottom of the barrel, providing conditions for the two valve pieces acting on the inner side damping holes 12 and outer side damping holes 13, respectively, to correspond to the first stop ring 14 and the second stop ring 15, and maintaining the accuracy of the position of the valve pieces during installation and use. In addition, a plurality of flow control grooves 141 are formed in the first stop ring 14 and the second stop ring 15 corresponding to each inner side damping hole 12 and outer side damping hole 13, respectively, so that when the valve piece is tilted and raised by a small angle due to stress, the shock-absorbing oil can flow through the corresponding flow control grooves 141, that is, the shock-absorbing demand can be met when the valve piece is deformed by a small angle, the sensitivity of the shock-absorbing response is higher, and the shock-absorbing effect is better, thereby improving the performance of the shock absorber.

[0025] More specifically, flow control grooves 141 are arranged on both sides of each outer side damping hole 13 and inner side damping hole 12, which can maintain the balance of stress on both sides, prevent the piston body 1 from rotating relatively during long-term use due to uneven stress, and make the structure design more reasonable.

[0026] Figure 2 A sectional view of one embodiment of the rubber-coated piston with a flow control groove of the utility model. As shown in Figure 1 and Figure 2 The outer side wall of the piston body 1 is provided with a plurality of annular positioning grooves 16 along the axial direction, so that each annular positioning groove 16 can be wrapped around the outer side wall of the piston body 1, achieving full coverage of the outer side wall of the piston body 1. In addition, the plurality of annular positioning grooves 16 are arranged along the axial direction of the piston body 1, so that the outer side wall of the piston body 1 can have more annular positioning grooves 16 for positioning, improving the positioning stability and reliability. At the same time, the inner side wall of the rubber-coated ring 2 is also provided with a plurality of annular matching ribs 21 along the circumferential direction, so that the matching ribs can also be wrapped around the inner side wall of the rubber-coated ring 2, and the plurality of annular matching ribs 21 are arranged along the axial direction of the rubber-coated ring 2, so that the rubber-coated ring 2 can also have more annular matching ribs 21 for positioning. During installation, the rubber-coated ring 2 is sleeved on the piston body 1, and the plurality of annular matching ribs 21 are embedded in the plurality of annular positioning grooves 16 one by one, so that the axial positioning of the rubber-coated ring 2 relative to the piston body 1 is achieved through the annular matching ribs 21 and the annular positioning grooves 16, maintaining the stability of the rubber-coated ring 2 in the axial direction of the piston body 1, so that when the piston body 1 slides along the axial direction, the rubber-coated ring 2 can stably follow the piston body 1 to move, meeting the requirement of continuous sealing with the inner wall of the cylinder.

[0027] More specifically, when the piston body 1 is provided with a plurality of annular positioning grooves 16, the rubber-coated ring 2 is connected to the piston body 1 by injection molding, and at this time the annular matching ribs 21 on the rubber-coated ring 2 are structures formed by injection molding, and can achieve stable connection of the rubber-coated ring 2 on the piston body 1.

[0028] In addition, the embodiment also provides another connection method of the piston body 1 and the rubber-coated ring 2. Figure 3 A sectional view of another embodiment of the rubber-coated piston with a flow control groove of the utility model. As shown in Figure 1 and Figure 3 The outer side wall of the piston body 1 is provided with an outer connecting thread 17 along the axial direction, and at the same time, the inner side wall of the rubber-coated ring 2 is provided with an inner connecting thread 22 along the axial direction, which matches the outer connecting thread 17, achieving the threaded connection of the piston body 1 and the rubber-coated ring 2, that is, the installation of the rubber-coated ring 2 on the piston body 1 is achieved by screwing, and the dismounting connection of the rubber-coated ring 2 on the piston body 1 is achieved, improving the structural flexibility. Since the rubber-coated ring 2 directly contacts the inner wall of the cylinder and rubs against each other when the piston slides in the cylinder, the rubber-coated ring 2 is a vulnerable part on the piston, and after a long time of use and wear, the rubber-coated ring 2 can be replaced directly, without the need to replace the entire piston, thereby reducing the maintenance and use cost, and the structural design is more reasonable.

[0029] More specifically, a limiting ring-shaped groove 18 is arranged on the outer side wall of the piston body 1 and located at the side of the outer connecting thread 17 close to the barrel bottom, that is, the limiting ring-shaped groove 18 is arranged at the terminal end of the outer connecting thread 17, and at the same time, the skirt 23 extending into the limiting ring-shaped groove 18 is arranged at the end of the encapsulating ring 2 close to the barrel bottom of the piston body 1, that is, after the encapsulating ring 2 is screwed on the piston body 1, the mutual limiting is realized by the skirt 23 entering into the limiting ring-shaped groove 18, the movement of the encapsulating ring 2 towards the side of the barrel bottom of the piston body 1 is limited, and the stability of the encapsulating ring 2 installed on the piston body 1 is improved.

[0030] More specifically, the end limiting ring 3 is arranged at one end of the barrel mouth of the piston body 1, at this time, the outer diameter of the end limiting ring 3 is greater than the inner diameter of the inner connecting thread 22, a limiting structure is formed at the end of the piston body 1 away from the barrel bottom by the end limiting ring 3, so that after the encapsulating ring 2 is sleeved on the piston body 1, one end of the encapsulating ring 2 can be limited by the end limiting ring 3, at this time, the two ends of the encapsulating ring 2 are limited by the limiting ring-shaped groove 18 and the end limiting ring 3 respectively, it is ensured that the encapsulating ring 2 can be reliably installed on the piston body 1, and the connection reliability is improved.

[0031] More specifically, a plurality of first connecting blocks 19 are arranged on the inner side wall of the barrel mouth of the piston body 1, and a plurality of second connecting blocks 31 corresponding to the first connecting blocks 19 are arranged on the inner side wall of the end limiting ring 3, preferably, the first connecting blocks 19 are arranged in a ring array on the piston body 1, and the second connecting blocks 31 are also arranged in a ring array on the end limiting ring 3, the uniform distribution of the first connecting blocks 19 on the piston body 1 and the uniform distribution of the second connecting blocks 31 on the end limiting ring 3 are realized. And the first connecting blocks 19 and the second connecting blocks 31 are detachably connected, that is, the detachable connection of the first connecting blocks 19 and the second connecting blocks 31 realizes the detachable installation of the end limiting ring 3 on the piston body 1, so that when the encapsulating ring 2 needs to be screwed on the piston body 1, the end limiting ring 3 is detached from the piston body 1, the screwing of the encapsulating ring 2 is facilitated, and after the encapsulating ring 2 is installed in place, the end limiting ring 3 is installed on the piston body 1 to limit the encapsulating ring 2, the structure is more flexible, and the disassembly and assembly are more convenient.

[0032] More specifically, a bayonet 191 is formed on one side of the first connecting block 19 and along the circumference of the piston body 1, that is, a side slot is provided on the first connecting block 19, and the second connecting block 31 is a clamping leg matched with the bayonet 191, so that when the end limiting ring 3 needs to be installed on the piston body 1, the end limiting ring 3 is coaxially connected with the piston body 1, and the end limiting ring 3 is appropriately rotated by a predetermined angle, so that the second connecting block 31 on the end limiting ring 3 is clamped into the bayonet 191 on one side of the first connecting block 19, thereby limiting the axial movement of the end limiting ring 3 relative to the piston body 1, achieving clamping installation of the end limiting ring 3 on the piston body 1, and facilitating disassembly and assembly.

[0033] More specifically, a first locking hole 192 is further formed on the first connecting block 19 and located at one end close to the barrel opening and along the axial direction of the piston body 1, and the first locking hole 192 communicates with the bayonet 191 on the first connecting block 19. At the same time, a second locking hole 311 corresponding to the first locking hole 192 is formed on the second connecting block 31, so that when the end limiting ring 3 is installed on the piston body 1 and the second connecting block 31 is clamped into the bayonet 191 on the first connecting block 19, a locking screw 4 is arranged between the first locking hole 192 and the second locking hole 311, that is, the first connecting block 19 and the second connecting block 31 are connected by a locking screw, effectively preventing the second connecting block 31 from being reversely detached from the corresponding bayonet 191, that is, limiting the circumferential rotation of the end limiting ring 3 on the piston body 1, and further improving the reliability of the end limiting ring 3 after being connected with the piston body 1.

[0034] The encapsulated piston with a flow control groove provided by the embodiment includes a piston body 1 and an encapsulating ring 2. First and second blocking rings 14 and 15 are arranged on the piston body 1 with inner and outer damping holes 12 and 13. The first and second blocking rings 14 and 15 respectively separate the inner and outer damping holes 12 and 13 on the outer and inner surfaces of the barrel bottom of the piston body 1. A plurality of flow control holes are formed on the first and second blocking rings 14 and 15. Each inner and outer damping hole 12 and 13 corresponds to a flow control groove 141. The flow control groove 141 realizes the communication between the inner and outer spaces of the first and second blocking rings 14 and 15, provides position accuracy for the installation and use of the valve plate, enables the flow of damping oil when the valve plate deforms slightly, and improves the flow rate of the damping oil, thereby improving the response sensitivity of the shock absorber, achieving better damping effect, and improving the use performance.

[0035] The above merely describes preferred embodiments of the present application, and is not intended to limit the implementation and protection scope of the present application. For those skilled in the art, it should be understood that any equivalent substitutions and obvious changes made according to the content of the present application and drawings should be included in the protection scope of the present application.

Claims

1. A rubber-coated piston with a flow control groove, comprising a piston body and a rubber-coated ring, wherein the rubber-coated ring is sleeved on the outer side wall of the piston body, characterized in that, The piston body is arranged in a barrel shape. A central mounting hole, several inner damping holes, and several outer damping holes are formed on the bottom of the piston body. The central mounting hole is located at the axis of the piston body. The inner and outer damping holes are arranged in a circular array around the axis of the central mounting hole, and are alternately distributed. A first retaining ring is provided on the outer surface of the piston body's bottom. The inner and outer damping holes are located inside and outside the first retaining ring, respectively. Simultaneously, a second retaining ring is provided on the inner surface of the piston body's bottom, at the opening of each outer damping hole. Several flow control grooves are correspondingly formed on the first retaining ring at each inner damping hole and on the second retaining ring at each outer damping hole.

2. The rubber-coated piston with a flow control groove according to claim 1, characterized in that, Each of the outer damping holes and the inner damping holes is provided with a flow control groove on both sides.

3. The rubber-coated piston with a flow control groove according to claim 1, characterized in that, The outer side wall of the piston body is provided with several annular positioning grooves along its axial direction. The several annular positioning grooves are arranged at intervals along the axial direction of the piston body. At the same time, the inner side wall of the rubber-coated ring is provided with several annular mating protrusions along its circumference. The several annular mating protrusions are arranged at intervals along the axial direction of the rubber-coated ring. When the rubber-coated ring is sleeved on the piston body, the several annular mating protrusions and the several annular positioning grooves are fitted one by one.

4. The rubber-coated piston with a flow control groove according to claim 3, characterized in that, The rubber-coated ring and the piston body are connected by injection molding.

5. The rubber-coated piston with a flow control groove according to claim 1, characterized in that, The piston body has an external connecting thread along its axial direction on its outer side wall, and the rubber-coated ring has an internal connecting thread along its axial direction that mates with the external connecting thread on its inner side wall.

6. The rubber-coated piston with a flow control groove according to claim 5, characterized in that, A limiting annular groove is formed on the outer wall of the piston body, on the side of the external connecting thread near the bottom of the barrel. At the same time, a skirt extending into the limiting annular groove is provided at the end of the rubber-coated ring near the bottom of the piston body.

7. The rubber-coated piston with a flow control groove according to claim 6, characterized in that, An end limiting ring is provided at one end of the piston body's barrel opening, and the outer diameter of the end limiting ring is larger than the inner diameter of the internal connecting thread.

8. The rubber-coated piston with a flow control groove according to claim 6, characterized in that, The piston body has a plurality of first connecting blocks on the inner side wall of the barrel opening, and a plurality of second connecting blocks corresponding one-to-one with the first connecting blocks are provided on the inner side wall of the end limiting ring, and the first connecting blocks and the second connecting blocks can be detached and connected.

9. The rubber-coated piston with a flow control groove according to claim 8, characterized in that, The first connecting block has a slot on one side and along the circumference of the piston body, and the second connecting block is a locking foot that cooperates with the slot.

10. The rubber-coated piston with a flow control groove according to claim 9, characterized in that, A first locking hole is provided on the first connecting block at one end near the barrel opening along the axial direction of the piston body. At the same time, a second locking hole corresponding to the first locking hole is provided on the second connecting block, and a locking screw is provided between the first locking hole and the second locking hole.

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