CN211449480U - Shock absorber and vehicle - Google Patents

Abstract

The utility model provides a shock absorber and vehicle, the shock absorber includes piston cylinder, piston rod, piston valve and movable valve, the movable valve includes the valve body shell and locates slider, elastic component and locating part in the axial through-hole of valve body shell, the partial cover of valve body shell is located the piston rod and is equipped with the one end of first opening, the locating part is fixed in the inner wall of axial through-hole, elastic component elasticity butt is between locating part and slider, the slider butt is in the terminal surface of piston rod and shelters from in first opening; when the shock absorber is in an extension state, the shock absorbing medium on one side of the piston valve acts on the sliding block through the second opening part and the first opening part in sequence under extension force, so that the sliding block is separated from the end face of the piston rod and flows to the other side of the piston valve through the axial through hole of the valve body shell. The utility model discloses can reduce the damping force that stretches under the high-speed vibration strikes in well, and can improve the life of the valve block that stretches in the shock absorber.

Description

Shock absorber and vehicle

Technical Field

The utility model relates to a vehicle accessory technical field, concretely relates to shock absorber and have vehicle of this shock absorber.

Background

The conventional vehicle shock absorber has very large stretching damping force under medium-high speed vibration impact, so that the riding comfort of a vehicle under high-speed impact is influenced. Moreover, when the extension valve plate in the shock absorber is subjected to a large impact force, the service life of the extension valve plate is shortened, so that the service life and the shock absorption effect of the shock absorber are influenced. Therefore, it is a problem to be solved how to provide a shock absorber capable of reducing the extension damping force under the middle-high speed vibration impact and improving the service life of the extension valve plate in the shock absorber.

SUMMERY OF THE UTILITY MODEL

The utility model provides a can reduce the damping force that stretches under the high-speed vibration strikes in well, and can improve the shock absorber and the vehicle of the life of the valve block that stretches in the shock absorber.

In a first aspect, the present invention provides a shock absorber, which comprises:

the piston cylinder is internally provided with a damping medium;

the piston rod is arranged in the piston cylinder and is provided with a first opening part and a second opening part which are communicated, the first opening part is arranged on the end surface of the piston rod, and the second opening part is arranged on the peripheral side surface of the piston rod;

the piston valve is sleeved on the peripheral side surface of the piston rod and positioned between the first opening part and the second opening part, and the peripheral surface of the piston valve is in sliding fit with the inner wall of the piston cylinder; and

the movable valve comprises a valve body shell, a sliding block, an elastic piece and a limiting piece, wherein the sliding block, the elastic piece and the limiting piece are arranged in an axial through hole of the valve body shell;

when the shock absorber is in a stretching state, the shock absorbing medium positioned on one side of the piston valve acts on the sliding block through the second opening part and the first opening part in sequence under the stretching force, so that the sliding block is separated from the end surface of the piston rod and flows to the other side of the piston valve through the axial through hole of the valve body shell.

In a possible implementation manner, the slider comprises a slider baffle and a slider shaft cylinder which are integrally connected, the slider baffle is shielded at the first opening, the outer peripheral surface of the slider shaft cylinder is in sliding fit with the inner wall of the axial through hole of the valve body shell, at least one first through hole communicated with the inner cavity of the slider shaft cylinder is formed in the slider shaft cylinder, and when the slider baffle is separated from the end surface of the piston rod, the at least one first through hole is communicated with the first opening.

In a possible implementation manner, the axial through hole of the valve body shell comprises a second through hole and a third through hole which are communicated with each other, the aperture of the third through hole is larger than that of the second through hole, and the inner wall of the second through hole is connected with the inner wall of the third through hole through a first step surface; one end of the piston rod is fixed on the inner wall of the third through hole, and a first gap is formed between the piston rod and the first step surface; the peripheral surface of the sliding block shaft cylinder is connected with the inner wall of the second through hole in a sliding mode, and the at least one first through hole is communicated with the first gap; when the slide block baffle is separated from the end face of the piston rod, the first gap is communicated with the first opening part.

In a possible embodiment, the elastic member is disposed in the slider shaft, and the elastic member is compressed between the slider baffle and the limiting member.

In a possible embodiment, the limiting member includes a first shaft cylinder and a second shaft cylinder which are integrally connected, an outer peripheral surface of the first shaft cylinder is connected with an outer peripheral surface of the second shaft cylinder through a second step surface, the first shaft cylinder is disposed in the slider shaft cylinder and abuts against the elastic member, the second shaft cylinder is fixedly connected with an inner wall of the axial through hole of the valve body housing, a second gap is formed between the slider shaft cylinder and the second step surface, and the second gap provides a sliding stroke for the slider.

In a possible embodiment, a first chamfer surface is provided on an inner wall of the first opening portion, a second chamfer surface is provided on a circumferential side surface of one end of the slider, and the second chamfer surface is attached to the first chamfer surface when the slider abuts against the end surface of the piston rod.

In one possible embodiment, the movable valve is fixed to a peripheral side surface of the piston rod and abuts against the piston valve, a third step surface is provided on the peripheral side surface of the piston rod, and the piston valve abuts against the third step surface under an abutting force of the movable valve.

In a possible implementation manner, a limit block is further disposed on the circumferential side surface of the piston rod, the limit block is used for limiting the expansion process of the shock absorber, and the second opening portion is disposed between the limit block and the third step surface.

In a possible embodiment, the shock absorber further includes a liquid storage cylinder, a top cover, a bottom cover, a guide, a bottom valve, a first connecting portion and a second connecting portion, the liquid storage cylinder is sleeved on the peripheral side surface of the piston cylinder, the top cover and the bottom cover are respectively connected with the opposite ends of the piston cylinder and the liquid storage cylinder in a sealing manner, the guide is fixedly connected with the top cover, the piston rod penetrates through and is connected with the guide in a sliding manner, one end of the piston rod extends out of the top cover and is connected with the first connecting portion, the bottom valve is arranged on the bottom cover, and the bottom cover is connected with the second connecting portion.

In a second aspect, the present invention further provides a vehicle, which comprises a chassis, a vehicle body and at least one vibration absorber, wherein the at least one vibration absorber is connected between the chassis and the vehicle body.

The utility model provides a shock absorber, when the shock absorber receives the medium-high frequency and assaults, form a oil flow passageway independent with the piston valve between piston rod and the movable valve to make the partial damping oil that is located between piston valve and the top cap bypass the piston valve, through the piston rod, the axial through-hole flow direction of valve body shell between piston valve and the bottom, thereby increased the fluid circulation volume of shock absorber when stretching the state, reduced the damping force value when the shock absorber receives the medium-high frequency and assaults, effectively improved the travelling comfort and the ride comfort nature of vehicle when the medium-high frequency assaults on the one hand, especially the vehicle passes the deceleration strip, passes the comfort performance when the hole; on the other hand, the impact force borne by the extension valve plate on the piston valve can be effectively reduced by installing the movable valve, and the durability of the extension valve plate in the piston valve in medium-high frequency impact is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a shock absorber according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a shock absorber according to an embodiment of the present invention;

fig. 3 is a schematic view of a shock absorber according to an embodiment of the present invention in a disassembled structure;

fig. 4 is a schematic cross-sectional partially enlarged view of a shock absorber according to an embodiment of the present invention;

fig. 5 is a schematic, partially enlarged, cross-sectional view of a piston rod according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a split structure of a movable valve according to an embodiment of the present invention;

fig. 7 is a partially enlarged schematic cross-sectional view of a movable valve and a piston rod according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a slider according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of a slider according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a valve body casing according to an embodiment of the present invention;

fig. 11 is a schematic cross-sectional view of a valve housing according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a limiting element according to an embodiment of the present invention;

fig. 13 is a schematic cross-sectional view of a limiting element according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention provides a shock absorber 10. Shock absorber 10 may be used in a vehicle or transport, such as a vehicle.

Referring to fig. 1 and 2, the shock absorber 10 includes a piston cylinder 1, a piston rod 2, a piston valve 3 and a movable valve 4.

It is to be understood that shock absorber 10 can be either a monotube or a multiple tube shock absorber. The present embodiment is described by taking the shock absorber 10 as a dual-tube shock absorber, but the present invention includes but is not limited to the dual-tube shock absorber.

Optionally, referring to fig. 2 and 3, the damper 10 further includes a liquid tank 5, a top cover 6, a bottom cover 7, a guide 8, and a bottom valve 9. The inner diameter of the liquid cartridge 5 is larger than the outer diameter of the piston cylinder 1. The liquid storage barrel 5 is sleeved on the peripheral side surface of the piston barrel 1 to form a compound barrel.

Referring to fig. 2 and 3, the top cover 6 and the bottom cover 7 are hermetically connected to opposite ends of the piston cylinder 1 and the liquid cylinder 5, respectively, and the piston cylinder 1 and the liquid cylinder 5 are assembled and fixed together. The inner cavity of the piston cylinder 1 and the inner cavity of the liquid storage cylinder 5 are filled with damping media. The inner cavity of the piston cylinder 1 is communicated with the inner cavity of the liquid storage cylinder 5, so that a damping medium can circularly flow in the inner cavity of the piston cylinder 1 and the inner cavity of the liquid storage cylinder 5. Optionally, the damping medium includes, but is not limited to, damping oil, damping gas, non-oil liquid for damping, and the like.

Referring to fig. 2 and 3, the guide 8 may be fixedly connected to the top cover 6. The piston rod 2 penetrates and slidably connects the guide 8 and the top cover 6. A portion of the piston rod 2 is located within the piston cylinder 1. Another part of the piston rod 2 extends out of the piston cylinder 1 through the top cover 6 and the guide 8 and is connected to the first connection 20. The guide 8 is used to guide the axial movement of the piston rod 2.

Referring to fig. 2 and 3, the bottom valve 9 connects the bottom cover 7 and the piston cylinder 1. The side of the bottom cover 7 facing away from the reservoir 5 is connected to the second connecting portion 30. When shock absorber 10 is applied to a vehicle, alternatively, the number of shock absorbers 10 may be four, and first connecting portion 20 of shock absorber 10 is fixedly connected to the vehicle body, and second connecting portion 30 of shock absorber 10 is fixedly connected to a portion of the chassis near the wheels for absorbing shock during the running of the vehicle.

Referring to fig. 4 and 5, a portion of the piston rod 2 located in the piston cylinder 1 has a first opening 21 and a second opening 22 communicated with each other. The first opening 21 is provided in an end surface 201 of the piston rod 2 (this end surface is a surface of the piston rod 2 facing the bottom cover 7). The second opening 22 is provided on the circumferential side surface of the piston rod 2. Specifically, the circumferential side surface of the piston rod 2 is a surface connected between end surfaces of the opposite ends of the piston rod 2. The second opening portion 22 and the first opening portion 21 are communicated with each other through a radial passage 23 and an axial passage 24 in sequence. Wherein the radial channel 23 is a section of channel extending from the second opening portion 22 to the central portion of the piston rod 2 in the radial direction of the piston rod 2; the axial passage 24 is a passage extending from the central portion of the piston rod 2 to the first opening portion 21 in the axial direction of the piston rod 2 and in the direction toward the bottom cap 7.

Referring to fig. 4 and 5, the piston valve 3 is sleeved on the circumferential side surface of the piston rod 2 and located between the first opening portion 21 and the second opening portion 22. The outer peripheral surface of the piston valve 3 is in sliding fit with the inner wall of the piston cylinder 1.

The piston valve 3 may be tightly wrapped around the circumferential surface of the piston rod 2 by its own tension, and may be fixed to the circumferential surface of the piston rod 2 by means of adhesion, screwing, engagement, or the like. Optionally, the piston valve 3 may be provided with an extension valve plate and a flow valve plate. Correspondingly, the bottom valve 9 can be provided with a compression valve plate and a compensation valve plate. Of course, the above structure of the piston valve 3 and the bottom valve 9 is only an example, and the embodiment of the present invention includes, but is not limited to, the above structure of the piston valve 3 and the bottom valve 9.

During the expansion process of the shock absorber 10, the piston valve 3 is gradually separated from the bottom cover 7, and the damping medium between the piston valve 3 and the top cover 6 is pressurized and flows to the space between the piston valve 3 and the bottom cover 7 through the valve port on the piston valve 3.

Referring to fig. 6 and 7, the movable valve 4 includes a valve housing 41, and a sliding block 43, an elastic member 44 and a limiting member 45 disposed in an axial through hole 42 of the valve housing 41. Specifically, the axial through hole 42 of the valve body case 41 is a through hole extending in the axial direction of the piston rod 2. The valve body case 41 is partially fitted around and fixed to an end of the piston rod 2 where the first opening 21 is formed. Alternatively, the axial through hole 42 of the valve body housing 41 has an internal thread, and the outer peripheral surface of the end of the piston rod 2 where the first opening portion 21 is provided has an external thread. The valve body housing 41 and the piston rod 2 are in threaded connection through matching of internal threads and external threads. Of course, in other embodiments, the valve housing 41 and the piston rod 2 may be fixedly connected by other means such as welding, snap-fit connection, or adhesion.

Referring to fig. 6 and 7, the limiting member 45 is fixed on the inner wall of the axial through hole 42 and is located on a side of the axial through hole 42 away from the piston rod 2. The slider 43 and the elastic member 44 are provided between the stopper 45 and the piston rod 2. The elastic member 44 elastically abuts between the stopper 45 and the slider 43. The slider 43 abuts against an end surface 201 of the piston rod 2 (this end surface is a surface of the piston rod 2 facing the bottom cover 7) by the elastic member 44 and blocks but does not block or close the first opening 21. In the installation process, optionally, the valve body housing 41 is rotated to thread the internal thread of the valve body housing 41 with the external thread of the piston rod 2, in this process, the sliding block 43 first touches the end surface 201 of the piston rod 2 (see the following description, which is not repeated), the elastic member 44 is gradually compressed along with the further thread-connection process of the valve body housing 41, and finally, the elastic member 44 pushes the sliding block 43 to abut against the end surface 201 of the piston rod 2.

It will be appreciated that when the slider 43 is separated from the end surface 201 of the piston rod 2, the first opening portion 21 communicates with the axial through hole 42 of the valve body case 41.

In the present embodiment, the vibration damping medium is exemplified as vibration damping oil. When the shock absorber 10 is in a stretched state (the stretched state refers to a process that the piston gradually moves away from the bottom cover 7 and gradually approaches the top cover 6) due to medium-high frequency impact, part of the damping oil between the piston valve 3 and the top cover 6 flows from the second opening portion 22 to the first opening portion 21 sequentially through the radial passage 23 and the axial passage 24 under the stretched force, and generates a thrust force on the slider 43 toward the bottom cover 7 at the first opening portion 21, and as the piston gradually moves away from the bottom cover 7, the thrust force of the damping oil on the bottom cover 7 increases until the thrust force of the damping oil on the bottom cover 7 is greater than the abutting force of the elastic member 44 on the slider 43, and at this time, the slider 43 separates from the end surface 201 of the piston rod 2 under the thrust force of the damping oil against the abutting force of the elastic member 44. After the slider 43 is separated from the end surface 201 of the piston rod 2, the damping oil is no longer blocked by the slider 43, but flows around the slider 43 or through a through hole in the slider 43 to the limiting member 45, and flows to the space between the movable valve 4 and the bottom cover 7 after passing through the limiting member 45.

When the shock absorber 10 is impacted by medium-high frequency, the piston rod 2 and the movable valve 4 form an oil flowing channel independent from the piston valve 3, so that part of damping oil between the piston valve 3 and the top cover 6 bypasses the piston valve 3 and flows to a space between the piston valve 3 and the bottom cover 7 through the channel (including a radial channel and an axial channel) of the piston rod 2 and the axial through hole 42 of the valve body shell 41, thereby increasing the oil flowing amount of the shock absorber 10 in a stretching state, reducing the damping force value of the shock absorber 10 when the shock absorber 10 is impacted by medium-high frequency, effectively improving the comfort and smoothness of a riding vehicle when the shock absorber is impacted by medium-high frequency, particularly the comfort performance of the vehicle when the vehicle passes through a deceleration strip and a pit; on the other hand, the impact force applied to the expansion valve plate on the piston valve 3 can be effectively reduced by installing the movable valve 4, and the durability of the expansion valve plate in the piston valve 3 in medium-high frequency impact is improved.

It is understood that when shock absorber 10 is no longer in the extended state or shock absorber 10 is in the compressed state, slider 43 blocks first opening 21 by elastic member 44. Alternatively, the movable valve 4 may be a check valve.

Referring to fig. 4 and 5, a limit step surface 25 is disposed on the circumferential side surface of the piston rod 2. The movable valve 4 is fixed to the circumferential side surface of the piston rod 2 and abuts against the piston valve 3. The piston valve 3 is abutted against the limiting step surface 25 under the abutting force of the movable valve 4 so as to realize the fastening of the piston valve 3.

The installation sequence of the movable valve 4 and the piston valve 3 on the piston rod 2 is as follows: a through hole in the middle of the piston valve 3 penetrates through a shaft at one end of the piston rod 2, and one end of the piston valve 3 props against a limiting step surface 25 of the piston rod 2; subsequently, the movable valve 4 is screwed into the shaft at one end of the piston rod 2 through threaded connection or other modes, so that the movable valve 4 is abutted against one end of the piston valve 3 departing from the limiting step surface 25, and the limiting step surface 25 and the movable valve 4 realize the fastening of the piston valve 3.

Referring to fig. 4 and 5, a limiting block 26 is further disposed on the peripheral side of the piston rod 2. The stop block 26 serves to limit the extension travel of the shock absorber 10. When the stop 26 abuts the guide 8, the extension of the damper 10 is maximized. The second opening portion 22 is disposed between the stopper 26 and the stopper step surface 25, so that the second opening portion 22 is always located between the top cover 6 and the piston valve 3.

Referring to fig. 8 and 9, the slider 43 includes a slider retainer 431 and a slider shaft 432 integrally connected to each other.

Referring to fig. 7 to 9, the slider stopper 431 blocks the first opening 21. Further, a first chamfered surface 27 is provided on an inner wall of the first opening portion 21. A second chamfer surface 433 is arranged on the peripheral side surface of one end of the slide block baffle 431. When the slider 43 abuts against the end surface 201 of the piston rod 2, the second chamfered surface 433 abuts against the first chamfered surface 27 under the elastic force of the elastic member 44.

Referring to fig. 7 and 8, a slider shaft cylinder 432 is disposed on a side of the slider baffle 431 away from the piston rod 2. The outer peripheral surface of the slider shaft cylinder 432 is in sliding fit with the inner wall of the axial through hole 42 of the valve body case 41. At least one first through hole 434 communicated with the inner cavity of the sliding block shaft cylinder 432 is formed in the peripheral side surface of the sliding block shaft cylinder 432. Alternatively, the first through hole 434 may extend in the radial direction of the piston rod 2, so that the first through hole 434 communicates the inner cavity of the slider shaft cylinder 432 with the space outside the slider shaft cylinder 432 and inside the axial through hole 42 of the valve body housing 41. Optionally, the number of the first through holes 434 is plural, and the plural first through holes 434 are uniformly or non-uniformly arranged around the circumference of the slider shaft cylinder 432.

When the slider stopper 431 is separated from the end surface 201 of the piston rod 2, the at least one first through hole 434 communicates with the first opening portion 21 so that damping oil can flow from the first opening portion 21 into the inner cavity of the slider shaft 432 through the first through hole 434, and the inner cavity of the slider shaft 432 communicates with the space between the piston valve 3 and the bottom cover 7, so that damping oil flows to the space between the piston valve 3 and the bottom cover 7 through the passage in the piston rod 2 and the movable valve 4.

In other embodiments, the first through hole 434 may also extend in the axial direction of the piston rod 2 and penetrate the slider stopper 431, and the opening of the first through hole 434 on the slider stopper 431 is not opposite to the first opening 21. In other words, when the slider stopper 431 blocks the first opening portion 21, the first through hole 434 is not in conduction with the first opening portion 21, and when the slider stopper 431 is separated from the end surface 201 of the piston rod 2, the first through hole 434 is in conduction with the first opening portion 21.

Referring to fig. 10 and 11, the axial through hole 42 of the valve body housing 41 includes a second through hole 421 and a third through hole 422 that are communicated with each other. The aperture of the third through hole 422 is larger than that of the second through hole 421. The inner wall of the second through hole 421 is connected to the inner wall of the third through hole 422 via a first step surface 423. One end of the piston rod 2 is fixed to the inner wall of the third through hole 422. Referring to fig. 7, a first gap 424 is formed between the end surface 201 of one end of the piston rod 2 and the first step surface 423. Optionally, the inner wall of the third through hole 422 is provided with an internal thread, the outer circumferential surface of one end of the piston rod 2 is provided with an external thread, and the outer circumferential surface of one end of the piston rod 2 is in threaded connection with the inner wall of the third through hole 422. Referring to fig. 10, a tightening step 46 is formed on an outer circumferential surface of an end of the valve body case 41 away from the piston rod 2, and the valve body case 41 is tightened at the tightening step 46 by a wrench.

Referring to fig. 7 and 11, the outer peripheral surface of the slider shaft cylinder 432 is slidably connected to the inner wall of the second through hole 421, and the at least one first through hole 434 is communicated with the first gap 424. When the slider stopper 431 is separated from the end surface 201 of the piston rod 2, the first gap 424 communicates with the first opening portion 21, so that the first opening portion 21 communicates with the first through hole 434. At this time, the damping oil flow path formed by the piston rod 2 and the movable valve 4 is: the space between the piston valve 3 and the top cap 6 reaches the space between the piston valve 3 and the bottom cap 7 through the second opening 22, the radial passage 23, the axial passage 24, the first opening 21, the first gap 424, the first through hole 434, the inner cavity of the slider shaft 432, and the inner cavity of the stopper 45 in this order.

Referring to fig. 7 and 8, the elastic member 44 is disposed in the slider shaft 432. The elastic member 44 is compressed between the slider stopper 431 and the stopper 45. The elastic member 44 is housed in the slider shaft cylinder 432, and the space occupied by each component is reduced, thereby improving compactness. In this embodiment, the elastic member 44 is taken as a spring for example, and in other embodiments, the elastic member 44 may also be a metal spring, an elastic silica gel, or the like.

Referring to fig. 11, the axial through hole 42 of the valve body housing 41 further includes a fourth through hole 425, the fourth through hole 425 is located on a side of the second through hole 421 away from the third through hole 422, a hole diameter of the fourth through hole 425 is larger than a space of the second through hole 421, and an inner wall of the fourth through hole 425 is connected to an inner wall of the second through hole 421 through a through hole step surface 426. Referring to fig. 7, the through-hole step 426 limits the installation of the limiting member 45.

Referring to fig. 12 and 13, the position-limiting member 45 includes a first shaft 451 and a second shaft 452 integrally connected to each other. The outer peripheral surface of the first barrel 451 and the outer peripheral surface of the second barrel 452 are connected by a second step surface 453.

Referring to fig. 7, an end of the first shaft 451 facing away from the second shaft 452 is disposed in the slider shaft 432 and abuts against the elastic element 44. The second shaft cylinder 452 is fixedly connected to the inner wall of the axial through hole 42 of the valve body housing 41. Optionally, an external thread is disposed on an outer circumferential surface of the second shaft cylinder 452, an internal thread is disposed on an inner wall of the fourth through hole 425, and the outer circumferential surface of the second shaft cylinder 452 is in threaded connection with the inner wall of the fourth through hole 425. The second step surface 453 abuts the through-hole step surface 426.

Referring to fig. 7, a second gap 427 is formed between an end of the slider shaft 432 away from the slider stopper 431 and the second step surface 453. The second gap 427 provides a sliding stroke for the sliding of the slider 43. The second step surface 453 is used to limit the sliding process of the slider 43.

Further, referring to fig. 12 and 13, an end surface of the second shaft cylinder 452 facing away from the first shaft cylinder 451 may be provided with a tightening hole 454, and a tightening torque may be applied to the tightening hole 454 by an adaptive wrench to screw the second shaft cylinder 452 with the valve body housing 41.

The embodiment of the utility model provides a vehicle, vehicle include chassis, automobile body and at least one as above-mentioned arbitrary embodiment shock absorber 10. The at least one shock absorber 10 is connected between the chassis and the vehicle body.

The chassis includes four wheels. The number of the at least one shock absorber 10 may be 4, and each shock absorber 10 is connected between one wheel and the vehicle body to uniformly damp the chassis.

The utility model provides a self-adaptation shock absorber 10, this shock absorber 10 is through increasing the passageway on piston rod 2 and setting up the movable valve 4 that communicates this passageway in the one end of piston rod 2, and this movable valve 4 can be opened when shock absorber 10 receives middle and high speed vibration and assaults, so that the part damping oil that is located between piston valve 3 and top cap 6 bypasses piston valve 3, flows to between piston valve 3 and bottom 7 through passageway, the movable valve 4 of piston rod 2, thereby increased the fluid circulation of shock absorber 10 when stretching the state, damping force value when having reduced shock absorber 10 and received middle and high frequency impact, ride vehicle's travelling comfort and ride comfort when effectively having improved middle and high frequency impact on the one hand, especially the vehicle passes the deceleration strip, the comfort performance when crossing the hole; on the other hand, the impact force applied to the expansion valve plate on the piston valve 3 can be effectively reduced by installing the movable valve 4, and the durability of the expansion valve plate in the piston valve 3 in medium-high frequency impact is improved.

The foregoing are some embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims (10)

1. A shock absorber, comprising:

the piston cylinder is internally provided with a damping medium;

the piston rod is arranged in the piston cylinder and is provided with a first opening part and a second opening part which are communicated, the first opening part is arranged on the end surface of the piston rod, and the second opening part is arranged on the peripheral side surface of the piston rod;

the piston valve is sleeved on the peripheral side surface of the piston rod and positioned between the first opening part and the second opening part, and the peripheral surface of the piston valve is in sliding fit with the inner wall of the piston cylinder; and

the movable valve comprises a valve body shell, a sliding block, an elastic piece and a limiting piece, wherein the sliding block, the elastic piece and the limiting piece are arranged in an axial through hole of the valve body shell;

when the shock absorber is in a stretching state, the shock absorbing medium positioned on one side of the piston valve acts on the sliding block through the second opening part and the first opening part in sequence under the stretching force, so that the sliding block is separated from the end surface of the piston rod and flows to the other side of the piston valve through the axial through hole of the valve body shell.

2. The shock absorber according to claim 1, wherein the slider includes a slider stopper and a slider shaft, the slider stopper is integrally connected to the first opening, the outer peripheral surface of the slider shaft is slidably fitted to the inner wall of the axial through hole of the valve body housing, the slider shaft is provided with at least one first through hole communicating with the inner cavity of the slider shaft, and the at least one first through hole communicates with the first opening when the slider stopper is separated from the end surface of the piston rod.

3. The shock absorber according to claim 2, wherein the axial through hole of the valve body housing includes a second through hole and a third through hole communicating with each other, the third through hole has a larger aperture than the second through hole, and an inner wall of the second through hole and an inner wall of the third through hole are connected by a first stepped surface; one end of the piston rod is fixed on the inner wall of the third through hole, and a first gap is formed between the piston rod and the first step surface; the peripheral surface of the sliding block shaft cylinder is connected with the inner wall of the second through hole in a sliding mode, and the at least one first through hole is communicated with the first gap; when the slide block baffle is separated from the end face of the piston rod, the first gap is communicated with the first opening part.

4. The damper of claim 2, wherein said resilient member is disposed within said slider axle housing, said resilient member being compressed between said slider stop and said retainer.

5. The damper according to claim 4, wherein the stopper includes a first barrel and a second barrel integrally connected to each other, an outer peripheral surface of the first barrel and an outer peripheral surface of the second barrel are connected by a second step surface, the first barrel is provided in the slider barrel and abuts against the elastic member, the second barrel is fixedly connected to an inner wall of the axial through hole of the valve body housing, and a second gap is formed between the slider barrel and the second step surface, the second gap providing a sliding stroke for the slider.

6. The shock absorber according to claim 1, wherein a first chamfered surface is provided on an inner wall of the first opening portion, a second chamfered surface is provided on a peripheral side surface of one end of the slider, and the second chamfered surface abuts the first chamfered surface when the slider abuts against the end surface of the piston rod.

7. The shock absorber according to claim 1, wherein the movable valve is fixed to a peripheral side surface of the piston rod and abuts against the piston valve, a limit step surface is provided on the peripheral side surface of the piston rod, and the piston valve abuts against the limit step surface under an abutting force of the movable valve.

8. The shock absorber according to claim 7, wherein a stopper is further provided on the circumferential side surface of the piston rod, the stopper is configured to limit the extension of the shock absorber, and the second opening portion is provided between the stopper and the stopper step surface.

9. The damper according to any one of claims 1 to 8, further comprising a liquid reservoir, a top cap, a bottom cap, a guide, a bottom valve, a first connecting portion and a second connecting portion, wherein the liquid reservoir is sleeved on the peripheral side surface of the piston cylinder, the top cap and the bottom cap are respectively and hermetically connected with the opposite ends of the piston cylinder and the liquid reservoir, the guide is fixedly connected with the top cap, the piston rod penetrates and is slidably connected with the guide, one end of the piston rod extends out of the top cap and is connected with the first connecting portion, the bottom valve is arranged on the bottom cap, and the bottom cap is connected with the second connecting portion.

10. A vehicle comprising a chassis, a body and at least one shock absorber according to any one of claims 1 to 9, said at least one shock absorber being connected between said chassis and said body.

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