CN215171777U - Vehicle shock absorber and car - Google Patents

Abstract

The utility model provides a vehicle shock absorber and vehicle, wherein, the vehicle shock absorber includes oil storage cylinder, first hydraulic buffer gear, second hydraulic buffer gear and communicates to the bottom valve subassembly of oil storage cylinder, the working cylinder of first hydraulic buffer gear is located the oil storage cylinder; the second hydraulic buffer mechanism comprises an inner pipe and a second piston rod, the inner pipe is located below the inner portion of the working cylinder, a gap is formed between the inner pipe and the working cylinder, and a plurality of first damping holes communicated to the working cylinder are formed in the side wall of the inner pipe. The utility model discloses in, the vehicle shock absorber has adopted the variable damped special construction of stroke, and first hydraulic buffer gear and second hydraulic buffer gear provide two sections compression strokes, can provide different damping force, can provide different damping according to the road surface condition of reality to reduce the produced vibration of vehicle when different road surfaces travel, carried out good buffering to the vehicle, thereby made the vehicle have better driving comfort.

Description

Vehicle shock absorber and car

Technical Field

The utility model relates to a shock absorber technical field of vehicle especially relates to a vehicle shock absorber and vehicle.

Background

The shock absorber is an important performance member installed between a vehicle body and wheels of a vehicle, and plays roles of buffering road surface impact, attenuating suspension and vehicle body vibration, and the like during driving of the vehicle. The specific quantitative index for evaluating the performance of the shock absorber is the self damping of the shock absorber, and is specifically embodied as the damping force of the shock absorber during compression or rebound in the working process. The shapes of the damping force, the speed curve and the damping force and displacement graph of the shock absorber directly influence the controllability and the comfort of the vehicle.

In the prior art, a shock absorber generally comprises a sleeved double-cylinder structure, a piston extends and retracts in an inner pipe, compressed oil flows out of a valve of the inner pipe and enters an outer cylinder, the piston is controlled to extend and retract by limiting oil flow, the same damping force value can be obtained during different piston extension strokes on the premise that the vehicle speed is constant, the shock absorber cannot adjust the damping force according to the actual condition of the road surface, the vehicle has jolt feeling, and the driving comfort is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vehicle shock absorber and vehicle to solve prior art, the shock absorber can't adjust the damping according to the actual conditions on road surface, leads to the relatively poor technical problem of vehicle driving travelling comfort.

In order to achieve the above object, the utility model adopts the following technical scheme:

the vehicle shock absorber comprises an oil storage cylinder, a first hydraulic buffer mechanism, a second hydraulic buffer mechanism and a bottom valve assembly communicated to the oil storage cylinder, wherein a working cylinder of the first hydraulic buffer mechanism is positioned in the oil storage cylinder;

the second hydraulic buffer mechanism comprises an inner pipe and a second piston rod movably inserted at the upper end of the inner pipe, the inner pipe is positioned below the inner part of the working cylinder, a gap is formed between the inner pipe and the working cylinder, and the side wall of the inner pipe is provided with a plurality of first damping holes communicated to the working cylinder;

the bottom valve assembly is arranged at the bottom of the working cylinder and is provided with a plurality of oil liquid passages communicated to the oil storage cylinder.

Preferably, the second hydraulic buffer mechanism further comprises a compression spring arranged inside the inner tube.

Preferably, the inner diameter of the first damping holes on the side wall of the inner tube is gradually reduced along the direction that the axis of the inner tube points downwards.

Preferably, the second hydraulic buffer gear is still including installing the director of inner tube upper end, the director includes director body and slide bearing, director body outer wall is equipped with and supplies the first breach that fluid in the working cylinder passes through, the guiding hole has been seted up at director body center, slide bearing install in the guiding hole, the second piston rod install in slide bearing's hole.

Preferably, the second piston rod includes the connecting rod and installs in the buffer piston of connecting rod lower extreme, the buffer piston outside is equipped with the sealing washer, the connecting rod includes the body of rod and lower body of rod, go up the body of rod and pass slide bearing, just go up body of rod lower extreme butt extremely buffer piston, the body of rod is fixed to buffer piston down.

Preferably, the first hydraulic buffer mechanism further comprises a first piston rod movably inserted at the upper end of the working cylinder, the first piston rod comprises a rod body and a piston valve assembly, and the lower end of the rod body penetrates through the piston valve assembly.

Preferably, the rod body of the first piston rod and the connecting rod of the second piston rod are coaxial.

Preferably, the base valve assembly includes a boss portion inserted and sealed in the lower end of the inner tube, and an annular base portion sealed in the lower end of the cylinder, and the oil passage in the cylinder includes a plurality of second orifices opened in the boss portion, and a plurality of second notches provided in an edge of the annular base portion.

Preferably, the foot valve assembly further comprises a mounting seat fixed to a bottom of the reservoir cylinder, and a fixing member for fixing the boss portion and the annular base portion to the mounting seat.

A vehicle is also provided, which comprises the vehicle shock absorber.

The utility model provides a beneficial effect of vehicle shock absorber and vehicle lies in:

the utility model provides a vehicle shock absorber has adopted along with the variable damped special construction of stroke, and first hydraulic buffer gear and second hydraulic buffer gear provide two sections compression strokes, can provide different damping force: the small buffer damping is provided on the road surface with good road condition and small buffer stroke, and the small high-frequency vibration can be absorbed; the vehicle shock absorber can provide different damping according to actual road conditions so as to reduce the vibration generated when the vehicle runs on different roads, and well buffer the vehicle, thereby ensuring that the vehicle has better driving comfort.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced 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 to obtain other drawings without inventive labor.

Fig. 1 is an overall schematic view of a vehicle shock absorber according to an embodiment of the present invention;

FIG. 2 is a partial schematic view of a vehicle shock absorber according to an embodiment of the present invention;

fig. 3 is a schematic view of a second hydraulic buffer mechanism in an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a second hydraulic buffer mechanism in an embodiment of the present invention;

fig. 5 is an exploded view of a second hydraulic buffer mechanism according to an embodiment of the present invention;

FIG. 6 is a schematic view of a base valve assembly according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating a flow direction of the compressed oil of the first hydraulic buffer mechanism according to the embodiment of the present invention;

fig. 8 is a schematic view illustrating a flow direction of the compressed oil of the second hydraulic buffer mechanism according to the embodiment of the present invention;

fig. 9 is a schematic diagram of the damping force varying with the compression stroke of the vehicle shock absorber at different speeds according to the embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-a working cylinder; 2-oil storage cylinder; 3-a second piston rod; 31-upper rod body; 32-lower rod body;

4-a guide; 41-a director body; 42-a slide bearing; 43-first notch;

5-a first clamp spring; 6-a buffer piston; 61-a piston body; 62-sealing ring; 7-piston nut; 8-a buffer spring; 9-inner tube; 91-a first orifice; 10-locking a nut; 11-a second clamp spring;

12-a base valve assembly; 121-a boss portion; 122-an annular base portion; 121-a second orifice; 122-a second gap; 13-a mounting seat; 14-locking studs; 15-a first piston rod; 151-piston valve assembly.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 8 together, a vehicle shock absorber according to the present embodiment will now be described, wherein the vehicle shock absorber includes a reservoir 2, a first hydraulic cushion mechanism, a second hydraulic cushion mechanism, and a base valve assembly 12. The first hydraulic buffer mechanism comprises a working cylinder 1 and a first piston rod 15 movably inserted at the upper end of the working cylinder 1. The working cylinder 1 is located inside the oil storage cylinder 2, a gap is formed between the working cylinder 1 and the oil storage cylinder 2, and oil is contained in the working cylinder 1. The second hydraulic buffer mechanism comprises an inner tube 9 and a second piston rod 3 movably inserted at the upper end of the inner tube 9. The inner pipe 9 is located below the inner portion of the working cylinder 1, a gap is formed between the inner pipe 9 and the working cylinder 1, a plurality of first damping holes 91 communicated to the working cylinder 1 are formed in the side wall of the inner pipe 9, and oil can flow between the inner pipe 9 and the working cylinder 1 through the first damping holes 91. The base valve assembly 12 is installed at the bottom of the working cylinder 1, that is, the base valve assembly 12 is installed at the bottom of the inner tube 9, and the base valve assembly 12 is further provided with a plurality of oil passages communicated to the oil reservoir 2.

During the running process of the vehicle, the compression operation process of the first hydraulic buffer mechanism in the vehicle shock absorber is as follows: after the first piston rod 15 is pressed down, the oil in the working cylinder 1 is pushed to move downwards, and because a gap is formed between the working cylinder 1 and the oil storage cylinder 2, a part of oil can move downwards along the outer wall of the inner pipe 9 all the way to the bottom valve assembly 12 and then enters the oil storage cylinder 2 through an oil passage on the bottom valve assembly 12; during the downward movement of the oil, another part of the oil enters the inner tube 9 from the first orifice 91 on the outer wall of the inner tube 9, then passes through the inner tube 9 and enters the oil reservoir 2 through the oil passage on the base valve assembly 12. In the process that oil flows through the oil passage, the oil passage limits the flow of the oil and feeds the oil back to the first piston rod 15 to realize damping force, the kinetic energy of the first piston rod 15 is consumed by the movement of the oil, and finally the impact force of the movement of the vehicle is absorbed, namely the damping buffering of the vehicle is realized. In this embodiment, the oil flow during the compression operation of the first hydraulic buffer mechanism is shown by the arrow in fig. 7.

The compression operation process of the second hydraulic buffer mechanism is similar to that of the first hydraulic buffer mechanism, and specifically comprises the following steps: after the second piston rod 3 is pressed down, oil in the inner tube is pushed, a part of oil flows into the working cylinder 1 from the first damping hole 91 on the side wall of the inner tube 9, and the other part of oil enters the oil storage cylinder 2 from the oil passage on the bottom valve assembly 12. In this embodiment, the oil flow direction during the compression operation of the second hydraulic buffer mechanism is shown by the arrow in fig. 8.

Since the second hydraulic cushion mechanism is located below the inside of the working cylinder 1 and the first piston rod 15 of the first hydraulic cushion mechanism is directly connected to the outside, the vehicle shock absorber in this embodiment actually includes two damping strokes: the first section of stroke is the compression operation stroke of the first hydraulic buffer mechanism, the first piston rod 15 is pressed down after external impact is applied, and the buffer is carried out by extruding oil in the working cylinder 1; the second section of stroke is the compression running stroke of the second hydraulic buffer mechanism, when the external impact stroke is longer, the first piston rod 15 is continuously pressed downwards until the second piston rod 3 is pressed, and at the moment, the second piston rod 3 is pressed downwards under the stress to extrude the oil in the inner tube 9 for buffering. During the second stroke, the first piston rod 15 is continuously depressed while being subjected to two damping forces: and finally, the damping force is greater than the damping force in the first section of stroke.

When the vehicle shock absorber in the embodiment is used for driving, in the driving process of a vehicle, on a high-frequency low-amplitude good road surface, the buffer compression stroke is short, and only the first section of stroke exists, so that the damping force of the vehicle shock absorber is small, and fine high-frequency vibration can be absorbed, so that the vehicle jolt is small, and the vehicle driving comfort is good; when the vehicle passes through the bumpy road surface such as a large convex hull and a pit, the buffer compression stroke is long, the vehicle enters a second section of stroke, the damping force of the vehicle shock absorber is increased steeply at the moment, the stroke of the jump of the suspension is short, the impact feeling and the impact noise of the whole vehicle are improved, the vibration of the large concave-convex road surface can be well buffered, and the vehicle has good driving comfort.

In conclusion, the vehicle shock absorber in the embodiment has two compression strokes, provides smaller buffer damping on a road with good road condition and smaller buffer stroke, can absorb fine high-frequency vibration, and ensures driving comfort of a vehicle under a better condition on the road; the damping device provides larger damping on bumpy road surfaces such as larger convex hulls and pits, can absorb impact vibration of larger strokes, and ensures the driving comfort of the vehicle under the bumpy road surfaces. Therefore, the sectional and variable damping of the vehicle shock absorber in the embodiment gives consideration to the driving comfort of a large concave-convex road surface and a good road surface, can adapt to different road surface conditions, and reduces the vibration generated when the vehicle runs on different road surfaces, so that the vehicle has better driving comfort.

In addition, the vehicle shock absorber can absorb vehicle vibration during vehicle driving, and the vehicle rolling control and the brake nodding performance are improved.

Preferably, as shown in fig. 2, the second hydraulic buffer mechanism further includes a compression spring 8 disposed inside the inner tube 9. During the depression of the second piston rod 3, in addition to the damping by the oil, a damping by the compression spring 8 is also provided. Generally, the magnitude of the oil damping is independent of the compression stroke, and is a relatively linear damping, but as the compression stroke increases, the damping provided by the compression spring 8 increases. In other words, the vehicle shock absorber provides a smaller and smoother cushion damping during the first stage of compression stroke, while the vehicle shock absorber provides a larger cushion damping which increases with increasing compression stroke during the second stage of compression stroke, further increasing the cushion capacity of the vehicle on bumpy roads such as large pits, convex hulls, etc.

Preferably, as shown in fig. 2 and 3, the inner diameter of the plurality of first damping holes 91 is gradually reduced along the sidewall of the inner tube 9 in a direction in which the axis of the inner tube 9 is directed downward. That is, in the process of pressing down the second piston rod 3, the maximum flow rate of the oil leaking from the inner tube 9 is gradually reduced, the damping force of the oil is increased along with the increase of the compression stroke, similar to the effect brought by the compression spring 8, the damping is also increased along with the stroke, and the damping capacity of the vehicle running on bumpy road surfaces such as large pits and convex hulls is further increased.

Preferably, as shown in fig. 2, 4 and 5, the second hydraulic buffer mechanism further includes a guide 4 installed at the upper end of the inner tube 9, and the guide 4 includes a guide body 41 and a sliding bearing 42. Wherein, the lower extreme of director body 41 is fixed each other through first jump ring 5 and inner tube 9, the outer wall butt at the working cylinder 1 of director body 41 upper end to the outer wall of director body 41 is equipped with the first breach 43 that can supply oil to pass through, and during the clearance between working cylinder 1 and the inner tube 9 was got into to fluid accessible first breach 43, in first section compression stroke, fluid flowed to bottom valve assembly 12 through first breach 43 to and the clearance between working cylinder 1 and the inner tube 9, then flowed to in the oil storage jar 2 from bottom valve assembly 12. Still seted up the guiding hole at the center of director 4, slide bearing 42 installs in the guiding hole, and second piston rod 3 installs in slide bearing 42's hole, through the cooperation between slide bearing 42 and the director 4, realizes direction and lubrication action, has guaranteed that second piston rod 3 can be at the linear motion on the axis of inner tube 9.

Preferably, as shown in fig. 2, the second piston rod 3 includes a connecting rod and a damping piston 6 mounted at a lower end of the connecting rod, and a sealing ring 62 is disposed outside the damping piston 6. The connecting rod comprises an upper rod body 31 and a lower rod body 32 with a smaller inner diameter, the upper rod body 31 penetrates through the sliding bearing 42, the lower end of the upper rod body 31 is abutted to the buffer piston 6, and the lower rod body 32 is fixed to the buffer piston 6 through the piston nut 7. In the process of connecting rod pushing down, go up body of rod 31 and slide bearing 42 cooperation and realize the direction to go up body of rod 31 lower extreme and promote buffer piston 6, the inner wall of inner tube 9 is hugged closely to the sealing washer 62 in the buffer piston 6 outside, avoids fluid to reveal, fully transmits the fluid of pressure to the inner tube 9 in.

Preferably, as shown in fig. 1 and 2, the first piston rod 15 includes a rod body and a piston valve assembly 151, wherein a lower end of the rod body passes through the piston valve assembly 151 and is exposed. After the first piston rod 15 is pressed down to a certain degree, the exposed part at the lower end of the rod body is abutted to the upper end of the second piston rod 3, the downward pressure is transmitted to the second piston rod 3, the second piston rod 3 is driven to continue to be pressed down, and the second section of compression stroke is started.

Preferably, as shown in fig. 1 and 2, the rod body and the connecting rod are coaxial, so that the damping force is transmitted on the rod body and the connecting rod in a straight line. Furthermore, the inner pipe 9, the working cylinder 1, the oil storage cylinder 2, the rod body and the connecting rod have a common central axis, so that the buffering force is always transmitted on the same straight line.

Preferably, as shown in fig. 2, 4 and 6, the base valve assembly 12 includes a boss portion 121 at an upper end and an annular base portion 122 at a lower end, wherein the boss portion 121 is insertedly mounted to the lower end of the inner tube 9 and is fixed to the inner tube 9 by a second circlip 11. The annular base part 122 is mounted in a sealing manner at the lower end of the cylinder 1, and the edge of the annular base part 122 abuts against the inner wall of the cylinder 1. The oil passage includes a plurality of second orifice holes 121 opened in the boss portion 121 and a plurality of second notches 122 provided in the edge of the annular base portion 122. In the second section of compression stroke, a part of oil flows out from the lower end of the inner tube 9 to the second damping hole 121, then flows out through the middle space of the annular base part 122, finally enters the oil storage cylinder 2, the other part of oil flows out through the plurality of first damping holes 91 on the side wall of the inner tube 9 and converges into the oil in the working cylinder 1, and the oil in the working cylinder 1 flows out through the plurality of second gaps 122 on the periphery of the annular base part 122 and finally enters the oil storage cylinder 2.

Preferably, the foot valve assembly 12 further includes a mounting seat 13 fixed to the bottom of the reservoir 2, and a lock stud 14, a lock nut 10 for fixing the boss portion 121 and the annular base portion 122 of the lower end to the mounting seat 13.

The embodiment also provides a vehicle which comprises the vehicle shock absorber. In this embodiment, adopted foretell vehicle shock absorber on the suspension of vehicle, when the vehicle was gone on good road surface, vehicle shock absorber can provide less buffering damping, and when the vehicle was gone on the road surface of jolting of great pit, convex closure, vehicle shock absorber can provide great buffering damping, has alleviated jolting impact and the noise of impact that great buffer stroke caused the automobile body, can compromise the driving comfort on different road surfaces simultaneously.

In this embodiment, in the driving process of the vehicle, different buffering processes are performed on different road surfaces:

(1) on a good road surface, the vehicle has small vibration amplitude and high frequency. The compression stroke of the vehicle shock absorber is shorter, only the first hydraulic buffer mechanism participates in buffering, and the specific process is as follows: the first piston rod 15 is forced to press down, so that oil is pushed to pass through the first notch 43 from the working cylinder 1 to enter a gap between the working cylinder 1 and the inner pipe 9, and then the oil is divided into two parts, wherein one part of the oil flows to the inner pipe 9 outer wall, the bottom valve assembly 12, the second notch 122 and the oil storage cylinder 2, the other part of the oil flows to the inner pipe 9 outer wall, the first damping hole 91, the bottom valve assembly 12, the second damping hole 121 and the oil storage cylinder 2, hydraulic damping is achieved by limiting the flow speed and flow of the oil, and the oil is fed back to the first piston rod 15 to achieve buffering damping. The vehicle suspension only has oil to provide damping, actual damping force is small, high-frequency small-amplitude vibration can be well absorbed on a good road surface, and good driving comfort is provided for a vehicle.

(2) On poor road surfaces, such as complex road conditions like pits and convex hulls, the vehicle has large vibration amplitude and low frequency. The vehicle shock absorber compression stroke at this moment is longer, and first hydraulic buffer gear and second hydraulic buffer gear all participate in the buffering, and the concrete process is: first piston rod 15 atress pushes down, the lower extreme butt of the body of rod is to the upper end of connecting rod with pressure transmission to connecting rod, in the in-process that continues to push down, first piston rod 15 and second piston rod 3 push down simultaneously, fluid outflow process this moment divide into two parts equally, the flow direction of a part fluid is inner tube 9 inner wall-first damping hole 91-inner tube 9 outer wall-second breach 122-storage cylinder 2, the flow direction of another part fluid is inner tube 9-second damping hole 121-storage cylinder 2, because first hydraulic buffer gear and second hydraulic buffer gear work simultaneously this moment, the damping force that provides has showing and has increased, the impact vibration of the great stroke of absorption vehicle that can be better, driving comfort that provides the preferred for the vehicle. In addition, the compression spring 8 is arranged in the second hydraulic buffer mechanism, and the inner diameter of the first damping holes 91 on the side wall of the inner pipe 9 is gradually reduced along the downward direction, so that the second hydraulic buffer mechanism provides larger and larger damping force along with the increase of the compression stroke.

The vehicle shock absorber and the vehicle in the embodiment adopt the stroke-variable damping special structure, two different compression strokes are provided, different damping forces are provided, driving comfort of a good road surface and a poor road surface can be well considered, huge bumping feeling and vibration impact noise caused by large-amplitude jumping of a suspension are avoided, and the vehicle shock absorber and the vehicle also contribute to improving vehicle roll control, improving braking nodding performance and the like in the driving process.

The vehicle shock absorber and the vehicle in the embodiment can also provide adjustment schemes of damping forces (different road surface conditions) at different speeds, and different matching schemes can be provided according to actual requirements when the vehicle shock absorber and the vehicle need to be adjusted stably and comfortably. For example, damping force at different speeds may result in a damping force as a function of compression stroke as shown in FIG. 9, where the horizontal axis in FIG. 9 is the compression stroke (in mm) and the vertical axis in FIG. 9 is the damping force (N), where the curves of the damping force as a function of compression stroke at 7 speeds of 1.047m/s, 0.524m/s, 0.393m/s, 0.262m/s, 0.131m/s, 0.052m/s and 0.026m/s are shown from top to bottom. The damping force curves at all speeds in the figure show that small damping force is realized under the condition of a high-frequency low-amplitude road surface, and the vehicle adopting the vehicle shock absorber provided by the embodiment can obtain the damping force which is changed along with a compression stroke under different speeds, so that the vehicle body can be well controlled, the side-tipping condition of the vehicle body is improved, and the stability and comfort of the vehicle are improved.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A vehicle shock absorber is characterized by comprising an oil storage cylinder, a first hydraulic buffer mechanism, a second hydraulic buffer mechanism and a bottom valve assembly communicated to the oil storage cylinder, wherein a working cylinder of the first hydraulic buffer mechanism is positioned in the oil storage cylinder;

the second hydraulic buffer mechanism comprises an inner pipe and a second piston rod movably inserted at the upper end of the inner pipe, the inner pipe is located below the inner part of the working cylinder, a gap is reserved between the inner pipe and the working cylinder, and the side wall of the inner pipe is provided with a plurality of first damping holes communicated to the working cylinder.

2. The vehicle shock absorber according to claim 1, wherein an inner diameter of said first plurality of damping holes in said inner tube side wall is tapered in a direction in which said inner tube axis is directed downward.

3. The vehicle shock absorber according to claim 1, wherein the second hydraulic buffer mechanism further comprises a guide installed at an upper end of the inner tube, the guide comprises a guide body and a sliding bearing, an outer wall of the guide body is provided with a first notch through which oil in the working cylinder can pass, a guide hole is formed in the center of the guide body, the sliding bearing is installed in the guide hole, and the second piston rod is installed in an inner hole of the sliding bearing.

4. The vehicle shock absorber according to claim 3, wherein the second piston rod comprises a connecting rod and a buffer piston mounted at a lower end of the connecting rod, a sealing ring is disposed outside the buffer piston, the connecting rod comprises an upper rod body and a lower rod body, the upper rod body passes through the sliding bearing, a lower end of the upper rod body abuts against the buffer piston, and the lower rod body is fixed to the buffer piston.

5. The vehicle shock absorber of claim 1, wherein said first hydraulic cushion mechanism further comprises a first piston rod movably inserted into an upper end of said working cylinder, said first piston rod comprising a rod body and a piston valve assembly, a lower end of said rod body passing through said piston valve assembly.

6. The vehicle shock absorber of claim 5, wherein the rod body of the first piston rod and the rod of the second piston rod are coaxial.

7. The vehicle shock absorber of claim 1, wherein said second hydraulic damping mechanism further comprises a compression spring disposed inside said inner tube.

8. The vehicular shock absorber according to any one of claims 1 to 7, wherein the base valve assembly comprises a boss portion inserted and sealingly installed to a lower end of the inner tube, and an annular base portion sealingly installed to a lower end of the cylinder, and the oil passage in the cylinder comprises a plurality of second orifices opened to the boss portion, and a plurality of second notches provided to an edge of the annular base portion.

9. The vehicle shock absorber according to claim 8, wherein said foot valve assembly further comprises a mounting seat secured to a bottom of said reservoir cylinder, and means for securing said boss portion, said annular base portion to said mounting seat.

10. A vehicle characterized in that the vehicle comprises a vehicle shock absorber according to any one of claims 1 to 9.

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