JP2017032138A - Buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer capable of suppressing occurrence of poor appearance even when an auxiliary spring for preventing play of a suspension is provided.SOLUTION: A buffer A includes: a buffer body 1; a spring bearing 21 supporting one end of a suspension spring 2, and capable of moving in an axial direction of the buffer body 1; a jack 3 that has a housing 33 attached to the buffer body 1, and a piston 34 movably mounted on the outer periphery of the housing 33 and forming a liquid chamber L between itself and the housing 33; an auxiliary spring 22 interposed between the spring bearing 21 and the piston 34; and a spacer 4 provided in a parallel with the auxiliary spring 22, and having an axial length longer than the solid height of the auxiliary spring 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shock absorber.

  Conventionally, a shock absorber is used to support a rear wheel of a saddle-type vehicle such as a two-wheeled vehicle or a three-wheeled vehicle. Among such shock absorbers, there is a shock absorber in which a spring support that supports one end of a suspension spring that is a coil spring is driven by a jack so that the vehicle height can be adjusted (for example, Patent Document 1).

JP 2010-149548 A

  Here, when increasing the vehicle height adjustment amount in the shock absorber, it is preferable to increase the vehicle height adjustment amount without changing the suspension spring. This is because the suspension spring has already been optimally designed and it is cumbersome to redesign the suspension spring. However, in the conventional shock absorber, if the vehicle height adjustment amount is increased without changing the suspension spring, no load is applied to the suspension spring when the shock absorber is fully extended, and the suspension spring can move freely in the axial direction. The state, i.e., the suspension spring may be idle. Therefore, the applicant proposes a shock absorber having an auxiliary spring interposed between the jack and the spring receiver, and the suspension spring plays even if the vehicle height adjustment amount is increased without changing the longitudinal dimension of the suspension spring. I was able to prevent.

  In such a shock absorber, when the auxiliary spring, which is a coil spring, has a close contact height when attached to a parked vehicle, when the spring constant of the auxiliary spring is significantly smaller than the spring constant of the suspension spring, When the vehicle travels, the auxiliary spring is maintained in the contact height, so that the vehicle body can be elastically supported only by the suspension spring. However, in such a case, when an impact due to road surface unevenness is input, since the auxiliary spring receives a load in a close contact height, the coils constituting the auxiliary spring rub against each other to paint the auxiliary spring. Depending on the load that the auxiliary spring receives when it peels off, has a poor appearance, or is in close contact height, there is a possibility that stress exceeding the allowable stress may act on the wire constituting the auxiliary spring.

  Accordingly, an object of the present invention is to provide a shock absorber that can suppress the appearance failure even if an auxiliary spring is provided and can prevent an excessive stress from acting on the auxiliary spring.

  The invention according to claim 1, which solves the above problem, comprises a spring receiver that supports one end of a suspension spring and is movable in the axial direction of the shock absorber body, a housing attached to the shock absorber body, and the housing. A jack having a piston between which a liquid chamber is formed; an auxiliary spring interposed between the spring receiver and the piston; and an auxiliary spring provided in parallel with the axial length of the auxiliary spring. And a spacer longer than the contact height. Therefore, it is possible to prevent the auxiliary springs from coming into close contact with the spacer and prevent the coils constituting the auxiliary springs from contacting each other.

  In addition to the structure of Claim 1, in the invention of Claim 2, the approach of the said spring receiver and the said piston is controlled by the said spacer in the attachment state to the vehicle which stopped. Therefore, even if an auxiliary spring is provided, the spring characteristic of the shock absorber when the vehicle is running can be approximated to the spring characteristic of the shock absorber without the auxiliary spring.

  In the invention described in claim 3, in addition to the configuration described in claim 1 or 2, the spacer is connected to the piston. Therefore, the spacer can be prevented from being idle.

  In addition to the structure as described in any one of Claims 1-3, in the invention of Claim 4, the said spacer is cylindrical and is provided in the outer periphery of the said auxiliary | assistant spring. Therefore, even if the spacer is thin, the pressure receiving area of the spacer can be increased.

  According to the shock absorber of the present invention, even if an auxiliary spring is provided, it is possible to suppress the appearance failure and to prevent excessive stress from acting on the auxiliary spring.

It is the side view which simplified and showed the vehicle which attached the buffer which concerns on one embodiment of this invention. It is the front view which notched and showed the unloaded state of the buffer concerning one embodiment of the present invention partially, shows the state which advanced the piston to the right of the centerline, and shows the piston on the left of the centerline Is shown in the state in which is fully retracted. It is the front view which notched and showed the 1G state of the buffer concerning one embodiment of the present invention partially, shows the state which advanced the piston to the right of the center line, and shows the piston on the left side of the center line Indicates the maximum retracted state. It is the figure which expanded a part of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. The same reference numerals used throughout the several drawings indicate the same parts.

  As shown in FIG. 1, a shock absorber A according to an embodiment of the present invention is interposed between a vehicle body B and a rear wheel W of a vehicle V that is a motorcycle. As shown in FIG. 2, the shock absorber A includes a shock absorber main body 1, a suspension spring 2 provided on the outer periphery of the shock absorber main body 1, and a spring receiver 20 that supports the lower end of the suspension spring 2 in FIG. A spring receiver 21 that supports the upper end of the suspension spring 2 in FIG. 2, a jack 3 that adjusts the position of the spring receiver 21, an auxiliary spring 22 that is interposed between the spring receiver 21 and the jack 3, And a spacer 4 provided in parallel to the auxiliary spring 22.

  The shock absorber body 1 includes a cylindrical outer shell 10 and a rod 11 that is movably inserted into the outer shell 10, and has a damping force that suppresses relative movement of the outer shell 10 and the rod 11 in the axial direction. Demonstrate. Brackets 12 and 13 are fixed to the outer shell 10 and the rod 11, respectively. The bracket 12 on the outer shell 10 side is connected to the vehicle body B, and the swing arm that supports the rear wheel W is supported by the bracket 13 on the rod 11 side. It connects with b1 (FIG. 1) via the link which is not shown in figure. Therefore, when an impact due to road surface unevenness is input to the rear wheel W, the rod 11 enters and exits the outer shell 10 and the shock absorber main body 1 expands and contracts to exhibit a damping force. And as a result of the suspension spring 2 and the auxiliary spring 22 expanding and contracting together with the shock absorber main body 1, the shock absorber A expands and contracts.

  The suspension spring 2 is a coil spring formed by winding a wire in a coil shape, and exhibits an elastic force against the compression when compressed. The spring receiver 20 that supports the lower end of the suspension spring 2 in FIG. 2 is formed in an annular shape and provided on the outer periphery of the rod 11, and the downward movement of the rod 11 in FIG. 2 is restricted by the lower bracket 13 in FIG. Is done. A spring receiver 21 that supports the upper end of the suspension spring 2 in FIG. 2 is formed in an annular shape and provided on the outer periphery of the outer shell 10, and is supported by the jack 3 via the auxiliary spring 22 or the auxiliary spring 22 and the spacer 4. It is done.

  More specifically, a flange 14 protruding outward is fixed to the outer periphery of the upper end portion of the outer shell 10 in FIG. 2, and the outer periphery on the lower side in FIG. Covered. The spring receiver 21 is in sliding contact with the outer periphery of the guide 15 and is movable in the axial direction of the outer shell 10. The guide 15 is formed with annular grooves (not shown) extending in the circumferential direction at both ends in the axial direction, and snap rings 16 and 17 are fitted into the annular grooves. A spring receiver 21, an auxiliary spring 22, and a jack main body 30, which will be described later, of the jack 3 are arranged vertically in order from the lower side in FIG. 2 on the outer periphery of the guide 15, and these are retained by the snap rings 16, 17. Has been.

  The jack 3 includes the jack body 30, a pump 31 that supplies hydraulic oil to the jack body 30, and a motor 32 that drives the pump 31. The pump 31 and the motor 32 may have any configuration, and a well-known configuration can be adopted, and detailed description thereof is omitted here. In the case where the pump 31 is a gear pump, the pump 31 is inexpensive and excellent in durability, and the hydraulic oil can be quickly supplied to the jack body 30.

  The jack body 30 includes a bottomed cylindrical housing 33 having an annular base 33a provided on the outer periphery of the guide 15 and a cylindrical portion 33b extending downward from the outer peripheral portion of the base 33a in FIG. And an annular piston 34 slidably inserted into the cylindrical portion 33b. Between the base portion 33a and the guide 15, between the piston 34 and the guide 15, and between the piston 34 and the cylindrical portion 33b are respectively closed by annular O-rings (not shown). An annular space surrounded by the base portion 33a, the cylindrical portion 33b, the piston 34, and the guide 15 is a liquid chamber L, and is filled with hydraulic oil.

  The liquid chamber L is connected to the pump 31 via a hose or the like. When the hydraulic oil is supplied to the liquid chamber L by the pump 31, the piston 34 advances downward in FIG. On the contrary, when the hydraulic oil is discharged from the liquid chamber L by the pump 31, the piston 34 moves backward in FIG. 2 and the liquid chamber L is reduced.

  Subsequently, the auxiliary spring 22 interposed between the jack main body 30 and the spring receiver 21 on the outer periphery of the guide 15 is a coil spring formed by winding a wire rod in a coil shape. Demonstrate the resilience to resist. The auxiliary spring 22 is supported at its lower end in FIG. 2 by a spring receiver 21 and at its upper end in FIG.

  The spacer 4 provided in parallel with the auxiliary spring 22 is formed in a cylindrical shape and is connected to the lower end of the piston 34 in FIG. The inner diameter of the spacer 4 is equal to or greater than the outer diameter of the auxiliary spring 22, and the auxiliary spring 22 is inserted inside the spacer 4. Further, the outer diameter of the spacer 4 is equal to or smaller than the outer diameter of the piston 34, and the inner diameter of the auxiliary spring 22 is equal to or larger than the inner diameter of the piston 34. Accordingly, when the piston 34 is retracted, the auxiliary spring 22 enters the cylindrical portion 33b together with the spacer 4 while being supported by the piston 34, as shown on the left side in FIG.

  Further, as described above, the spring receiver 21 that supports the lower end of the auxiliary spring 22 in FIG. 2 supports the upper end of the suspension spring 2 in FIG. 2 and is movable in the axial direction of the outer shell 10. The auxiliary spring 22 is connected in series with the suspension spring 2 via the receiver 21.

  When the spring member S is composed of the suspension spring 2, the spring receiver 21 and the auxiliary spring 22 connected in series as described above, the elastic force of the spring member S acts on the piston 34, and the jack body 30 is It is pressed against the flange 14 by force. Further, the housing 33 of the jack body 30 is prevented from coming off from the guide 15 by the upper snap ring 17 in FIG. 2, and when the jack body 30 is pressed against the flange 14 by the elastic force, the outer shell 10 of the guide 15. The snap ring 17 and the flange 14 restrict the movement in the axial direction relative to. The elastic force of the spring member S also acts on the lower spring receiver 20 in FIG. 2, and the spring receiver 20 is pressed against the bracket 13 by the elastic force. Therefore, when the shock absorber body 1 expands and contracts, the spring member S expands and contracts, and the vehicle body B is elastically supported by the spring member S.

  FIG. 2 shows the shock absorber A in an unloaded state where no load is applied. In this unloaded state, the shock absorber A has a natural length, and the shock absorber body 1 is fully extended. In FIG. 2, the right side of the center line shows a state where the piston 34 is advanced as much as possible, and the left side shows a state where the piston 34 is retracted as much as possible.

  As shown on the right side in FIG. 2, in the state where the piston 34 is advanced to the maximum in an unloaded state, the auxiliary spring 22 deflects the suspension spring 2 by a certain amount to give an initial deflection, and the suspension spring 2 has a predetermined initial load. multiply. The spring receiver 21 does not interfere with the lower snap ring 16 in FIG. 2 in the assembled state of the shock absorber A even when the piston 34 is advanced to the maximum. When the snap ring 16 is provided in this manner, the spring receiver 21 can be prevented from coming out of the guide 15 due to the elastic force of the auxiliary spring 22 during the assembly process of the shock absorber A. Easy to do. However, after the assembly of the shock absorber A is completed, the snap ring 16 does not interfere with the spring receiver 21 and does not hinder the movement of the spring receiver 21.

  Further, as shown on the left side in FIG. 2, in the state where the piston 34 is retracted to the maximum in the no-load state, the piston 34 abuts against the base portion 33a of the housing 33, and the suspension spring 2 and the auxiliary spring 22 are of a natural length (free Close to the height). An annular recess 34a is provided on the outer peripheral side of the upper end of the piston 34 in FIG. 2 (FIG. 4), and the recess 34a faces the opening of the flow path connecting the liquid chamber L and the hose. Therefore, even if the piston 34 abuts against the base portion 33a at the time of the last retreat, the pressure receiving area of the piston 34 that receives the pressure of the hydraulic oil increases. In addition, you may provide the said dent 34a in the base 33a side.

  Subsequently, the natural length of the auxiliary spring 22 is determined by the initial deflection (compression) of the suspension spring 2 from the stroke length of the piston 34 (the distance traveled from the maximum advanced state to the maximum retracted state). It is more than the length minus (long).

  Here, for example, in the shock absorber A, the state where the initial load that gives the initial deflection X (mm) to the suspension spring 2 is applied to the suspension spring 2 while the piston 34 is advanced to the maximum is optimal, and the stroke of the piston 34 is optimized. The length is Y (mm). Considering the case where the auxiliary spring 22 is not provided, if the stroke length Y of the piston 34 is within a range that does not exceed the initial deflection X of the suspension spring 2, the suspension spring 2 can be operated even if the piston 34 is retracted to the maximum in an unloaded state. Does not play.

  However, in the state where there is no auxiliary spring 22, the stroke length Y of the piston 34 is increased to increase the vehicle height adjustment amount without changing the conditions related to the suspension spring 2, such as the suspension spring 2 and the initial load applied to the suspension spring 2. In this case, when the stroke length Y exceeds the initial deflection X, the suspension spring 2 may be idle. This is because, when the piston 34 is retracted to the maximum in an unloaded state, the suspension spring extends X (mm) to reach a natural length, and then the piston 34 further retracts YX (mm). This is because the suspension spring 2 can move in the axial direction by -X).

  On the other hand, the shock absorber A includes the auxiliary spring 22, and the natural length of the auxiliary spring 22 is longer than the length obtained by subtracting the initial deflection X from the stroke length Y of the piston 34, that is, (Y−X). Therefore, even if the vehicle height adjustment amount is increased without changing the suspension spring 2, the auxiliary spring 22 fills the gap that allows the suspension spring 2 to move in the axial direction (excessive retreat amount), and the suspension spring 2 is idle. To prevent it from becoming a state.

  Furthermore, the contact height (axial length in the most compressed state) of the auxiliary spring 22 is shorter than the axial length of the spacer 4, and the spring constant of the auxiliary spring 22 is larger than the spring constant of the suspension spring 2. Very small. Specifically, in the state where the weight of the vehicle V stopped (still) on the horizontal ground is applied to the shock absorber A in the attached state, that is, in the 1G state, as shown in FIG. And the spring receiver 21 hits the tip of the spacer 4 and the approach to the piston 34 is restricted. Therefore, the compression of the auxiliary spring 22 is prevented by the spacer 4, and the spring receiver 21 is supported by the piston 34 through the auxiliary spring 22 and the spacer 4. FIG. 3 shows the shock absorber A in the 1G state, showing a state in which the piston 34 is advanced to the right of the center line in FIG. 3, and retracting the piston 34 to the left of the center line in FIG. Shows the state.

  The suspension spring 2 does not reach the contact height with respect to the auxiliary spring 22 even when the shock absorber A is in the most contracted state. That is, in the 1G state, as described above, the approach of the spring receiver 21 and the piston 34 is restricted by the spacer 4 and the compression of the auxiliary spring 22 is prevented, so that the spring constant of the spring member S is the same as that of the suspension spring 2. The spring constant is obtained, and the vehicle body B is substantially supported only by the suspension spring 2.

  Hereinafter, the operation of the shock absorber A of the present embodiment will be described.

  When the vehicle V starts traveling, the hydraulic oil is supplied to the liquid chamber L by the pump 31 to advance the piston 34. Then, since the piston 34, the spring member S, the lower spring receiver 20 in FIG. 3 and the bracket 13 move downward in FIG. 3 with respect to the outer shell 10, the rod 11 is retracted from the outer shell 10 and the shock absorber. As A extends, the vehicle height increases.

  On the other hand, when the speed is lowered to stop the vehicle V, the hydraulic oil is discharged from the liquid chamber L by the pump 31 and the piston 34 is moved backward. Then, the piston 34, the spring member S, the lower spring receiver 20 in FIG. 3 and the bracket 13 move upward in FIG. 3 with respect to the outer shell 10, so that the rod 11 enters the outer shell 10 and the shock absorber. As A contracts, the vehicle height decreases.

  Further, when the vehicle travels in a normal vehicle state in which the vehicle weight, the weight of the passenger, the weight of the load, etc. are applied to the shock absorber A, the auxiliary spring 22 is compressed and the spring receiver 21 comes into contact with the spacer 4. Compression is hindered. Therefore, during normal vehicle travel, the spring member S behaves so as to consist only of the suspension spring 2. However, when the shock absorber A is fully extended, such as when climbing over a level difference, even if the piston 34 is in the last retracted state, the auxiliary spring 22 is prevented from extending and the suspension spring 2 is prevented from playing. Further, since the vehicle weight is applied to the shock absorber A even when the vehicle V is stopped, the spring receiver 21 is kept in contact with the spacer 4.

  Hereinafter, the function and effect of the shock absorber A according to the present embodiment will be described.

  In the present embodiment, the spacer 4 has a cylindrical shape and is provided on the outer periphery of the auxiliary spring 22. According to this configuration, since the outer diameter of the spacer 4 can be increased, the pressure receiving area of the spacer 4 can be increased even if the spacer 4 is thin. In addition, you may provide the spacer 4 in the inner periphery of the auxiliary spring 22, and the shape of the spacer 4 can also be changed suitably. For example, the spacer 4 may be plate-shaped or shaft-shaped.

  In the present embodiment, the spacer 4 is connected to the piston 34. According to this configuration, the spacer 4 can freely move in the axial direction in a state where the auxiliary spring 22 extends more than the axial length of the spacer 4, and the spacer 4 can be prevented from being idle. The same effect can be obtained by connecting the spacer 4 to the spring receiver 21. However, when the spacer 4 connected to the spring receiver 21 is provided on the outer periphery of the auxiliary spring 22, the spacer 4 and the cylindrical portion 33b are always provided. Are preferably overlapped, so that the cylindrical portion 33b of the housing 33 becomes longer. This is because, when the spacer 4 shown in FIG. 3 is connected to the spring receiver 21 as it is, the spacer 4 is separated from the housing 33 when the piston 34 is advanced as much as possible. This is because it is difficult to insert it into the cylindrical portion 33 b of the housing 33.

  Further, in the present embodiment, the spacer 4 is seamlessly integrated with the piston 34, and the spacer 4 and the piston 34 are one part. However, after the spacer 4 and the piston 34 are formed separately, You may connect by fitting, screwing, adhesion, etc. That is, the state in which the spacer 4 and the piston 34 are connected may be such that the spacer 4 and the piston 34 are not separated from each other, and a part that functions as the spacer 4 and a part that functions as the piston 34 in one part. In some cases, the case where the individually formed spacer 4 and the piston 34 are physically or chemically joined includes the case where a joining member is interposed therebetween. Such a change is possible regardless of the arrangement and shape of the spacer 4.

  Further, in the present embodiment, the approach of the spring receiver 21 and the piston 34 is restricted by the spacer 4 in an attached state to the vehicle V that has stopped. According to this configuration, during normal vehicle travel, the compression of the auxiliary spring 22 is prevented by the spacer 4, so that the vehicle body B is elastically supported by the suspension spring 2. Therefore, even if the auxiliary spring 22 is provided, the spring characteristics of the shock absorber A can be approximated to the spring characteristics of the shock absorber without the auxiliary spring, and the shock absorber A including the auxiliary spring 22 and the shock absorber without the auxiliary spring are provided. The suspension spring 2 having a common specification can be used.

  In addition, the effect similar to the above can be obtained even in the riding 1G state where the approach of the spring receiver 21 and the piston 34 is restricted by the spacer 4 in the 1G state where the rider's weight is added. Such a change is possible regardless of the arrangement, shape, connection object, and method of the spacer 4.

  Further, in the present embodiment, the shock absorber A includes a shock absorber main body 1 and a spring receiver 21 that supports the upper end (one end) in FIG. 2 of the suspension spring 2 and is movable in the axial direction of the shock absorber main body 1. A jack 3 having a housing 33 attached to the shock absorber main body 1 and a piston 34 that is movably attached to the housing 33 and forms a liquid chamber L between the housing 33 and the spring receiver 21 and the piston 34. An auxiliary spring 22 interposed therebetween and a spacer 4 provided in parallel with the auxiliary spring 22 and having an axial length longer than the contact height of the auxiliary spring 22 are provided.

  According to the above configuration, even if the vehicle height adjustment amount is increased without changing the axial length of the suspension spring 2, it is possible to prevent the suspension spring 2 from becoming idle. And if vehicle height adjustment amount is increased, the footing property at the time of a vehicle stop can be made favorable. Further, if the suspension spring 2 is not allowed to play by the auxiliary spring 22, even if the jack body 30 is supported by the elastic force of the suspension spring 2 as in the present embodiment, the jack body 30 may fall off. The jack body 30 and the flange 14 can be separated and contacted repeatedly to prevent abnormal noises from being generated or shifted.

  Furthermore, according to the said structure, even if the auxiliary spring 22 is provided, it can prevent with the spacer 4 that the auxiliary spring 22 becomes contact | adherence height. Therefore, since it can suppress that the coil which comprises the auxiliary spring 22 rubs and the coating of the auxiliary spring 22 peels off, it can suppress that an external appearance defect arises. Further, since the auxiliary spring 22 does not reach the contact height, no load is applied to the auxiliary spring 22 when the coils constituting the auxiliary spring 22 are in contact with each other, and it is possible to prevent excessive stress from acting on the auxiliary spring 22. . Further, if the auxiliary spring 22 is prevented from reaching the contact height, the strength against compression in the state where the auxiliary spring 22 is at the contact height is not required, so that the wire diameter of the auxiliary spring 22 can be reduced and the auxiliary spring 22 can be reduced. It is easy to make the spring constant of 22 small.

  In the shock absorber A, the suspension spring 2 and the auxiliary spring 22 are coil springs, but may be a square spring in which a material having a rectangular cross section is coiled.

  Further, in the shock absorber A, the guide 15 is provided on the outer periphery of the outer shell 10 and the spring receiver 21 and the piston 34 are slidably contacted with the guide 15. You may make it make the spring receiver 21 and the piston 34 slidably contact the outer periphery of the outer shell 10 directly.

  The jack 3 includes a jack body 30 having a piston 34 and a housing 33, a pump 31 that supplies hydraulic oil to the jack body 30, and a motor 32 that drives the pump 31. It can be changed as appropriate. For example, the liquid used for the jack 3 may be other than hydraulic oil, and water, an aqueous solution, or the like may be used.

  In the shock absorber A, the outer shell 10 is connected to the vehicle body B and the rod 11 is connected to the rear wheel W, which is an inverted type, but the outer shell 10 is connected to the rear wheel W. At the same time, the rod 11 may be connected to the vehicle body B to be an upright type.

  The shock absorber A is interposed between the motorcycle body B and the rear wheel W of the motorcycle. However, the shock absorber A may be used for a straddle-type vehicle other than a motorcycle, an automobile, or the like. .

  The above-described changes can be made regardless of the arrangement, shape, connection target, and method of the spacer 4, and the timing at which the spacer 4 regulates the approach between the spring receiver 21 and the piston 34.

  The preferred embodiments of the present invention have been described above in detail, but modifications, changes and modifications can be made without departing from the scope of the claims.

A ... shock absorber, L ... liquid chamber, V ... vehicle, 1 ... shock absorber body, 2 ... suspension spring, 3 ... jack, 4 ... spacer, 21 ... Spring receiver, 22 ... auxiliary spring, 33 ... housing, 33b ... cylinder, 34 ... piston

Claims (4)

The shock absorber body,
A spring receiver that supports one end of the suspension spring and is movable in the axial direction of the shock absorber body;
A jack having a housing attached to the shock absorber body and a piston that is movably mounted on the housing and forms a liquid chamber between the housing and the housing;
An auxiliary spring interposed between the spring receiver and the piston;
A shock absorber comprising: a spacer that is provided in parallel with the auxiliary spring and whose axial length is longer than a contact height of the auxiliary spring. 2. The shock absorber according to claim 1, wherein in a state of being attached to a stopped vehicle, approach of the spring receiver and the piston is restricted by the spacer. 3. The shock absorber according to claim 1, wherein the spacer is connected to the piston. The shock absorber according to any one of claims 1 to 3, wherein the spacer has a cylindrical shape and is provided on an outer periphery of the auxiliary spring.

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