JP5894484B2 - Suspension device - Google Patents

Description

  The present invention relates to an improvement of a suspension device.

  In general, in transportation equipment such as automobiles and motorcycles, a suspension device is interposed between a vehicle body and wheels. The suspension device includes a suspension spring that elastically supports the vehicle body and absorbs an impact caused by road surface unevenness, and a shock absorber that suppresses expansion and contraction of the suspension spring accompanying the absorption of the impact. The transmission is suppressed.

  For example, a suspension device disclosed in Patent Literature 1 is a suspension device for a rear wheel suspension that is interposed between a swing arm that supports a rear wheel and a vehicle body in a two-wheeled vehicle, and includes a suspension spring and a shock absorber. In addition, a spring load adjusting mechanism for adjusting the spring load of the suspension spring is provided.

  The shock absorber includes a cylinder connected to one side of the vehicle body or the wheel, and a piston rod connected to the other side of the vehicle body or the wheel and inserted into the cylinder so as to be retractable. A suspension spring composed of a coil spring is interposed between one side spring receiver attached to the piston rod and the other side spring receiver attached to the non-cylinder side of the piston rod.

  The suspension load adjusting mechanism of the suspension device includes a jack chamber that is disposed on the outer periphery of the cylinder and is formed on the side opposite to the suspension spring of the one-side spring receiver, and a pump that supplies oil to the jack chamber. By supplying oil to the jack chamber with this pump, the one side spring receiver can be jacked up to increase the spring load.

  Patent Document 2 discloses a suspension device including a spring load adjusting mechanism in which the pump is driven by a motor.

No. 7-12746 Japanese Utility Model Publication 5-45279

  However, the conventional suspension device is useful in that the spring load of the suspension spring can be adjusted, but the following problems may be pointed out.

  That is, in the conventional suspension device, it is necessary to form a jack chamber on the outer periphery of the cylinder, and to provide a pump and a motor for supplying oil to the jack chamber outside the cylinder and the suspension spring. For this reason, when a suspension apparatus is bulky and it attaches a suspension apparatus to the narrow space between a vehicle body and a swing arm, a layout is difficult.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a suspension device that can adjust the spring load of the suspension spring and can be laid out more freely than before.

A first means for solving the above-mentioned problems is a suspension spring interposed between a vehicle body and a swing arm that is swingably connected to the vehicle body and supports a rear wheel, and a spring load of the suspension spring A suspension device comprising: a spring load adjustment mechanism for adjusting the load ; a vehicle body side spring receiver that supports one end of the suspension spring; and a wheel side spring receiver that supports the other end of the suspension spring. A rotary damper having a shaft that is rotatably inserted and rotates as the swing arm swings and the suspension spring expands and contracts, and a damping force generating means for suppressing the rotation of the shaft, and an extension amount of the suspension spring together and a fully extended regulating member for limiting, the suspension spring is a coil spring, the spring load adjusting mechanism and the fully extended regulating member on the inside of the suspension spring It is that they are entering.
The second means for solving the above-described problems includes a suspension spring interposed between the vehicle body and a swing arm that is swingably connected to the vehicle body and supports the rear wheel, and a spring load of the suspension spring. A suspension device comprising: a spring load adjustment mechanism for adjusting the load; a vehicle body side spring receiver that supports one end of the suspension spring; and a wheel side spring receiver that supports the other end of the suspension spring. The suspension spring includes a rotary damper that includes a shaft that is rotatably inserted and rotates as the swing arm swings and the suspension spring expands and contracts, and a damping force generation unit that suppresses the rotation of the shaft. The spring load adjusting mechanism includes a jack chamber for raising and lowering one of the vehicle body side spring receiver and the wheel side spring receiver, and the jack chamber. A working chamber that communicates; a piston that feeds and returns oil from the working chamber to the jack chamber; and a driving device that drives the piston. The working chamber, the piston, and the driving device are connected to the suspension spring. It is to be provided inside.

  According to the present invention, the spring load of the suspension spring can be adjusted, and the layout can be more freely made than before.

It is the front view which showed the attachment state of the suspension apparatus which concerns on one embodiment of this invention. It is the longitudinal cross-sectional view which showed the spring load adjustment mechanism part of the suspension apparatus which concerns on one embodiment of this invention. It is the figure which showed in principle the rotary damper part of the suspension apparatus which concerns on one embodiment of this invention.

  A suspension device according to an embodiment 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, the suspension device S according to the present embodiment is interposed between a vehicle body B and a swing arm A that is swingably connected to the vehicle body B and supports a rear wheel (wheel) (not shown). A suspension spring 1 to be mounted and a spring load adjusting mechanism 2 for adjusting the spring load of the suspension spring 1 are provided.

  Further, the suspension device S includes a hollow housing 30 (FIG. 3) and a shaft 31 (which is rotatably inserted into the housing 30 and rotates as the swing arm A swings and the suspension spring 1 extends and contracts. 3) and a rotary damper 3 provided with damping force generating means V (FIG. 3) for suppressing the rotation of the shaft 31.

  In the suspension device S, the suspension spring 1 is a coil spring, and the spring load adjusting mechanism 2 is inserted inside the suspension spring 1.

  Hereinafter, in detail, the suspension device S according to the present embodiment is a suspension device for rear wheel suspension mounted on a motorcycle. Since the structure of the motorcycle is well known, it is not shown in detail. However, the motorcycle B holds the prime mover (engine), and serves as a skeleton of the vehicle body, and can swing on the frame B1 via the pivot shaft 4. And a rear wheel (not shown) that is rotatably supported by the swing arm A and is driven to rotate by the prime mover.

  Subsequently, the suspension spring 1 interposed between the vehicle body B and the swing arm A is composed of a coil spring as described above, and is interposed between the vehicle body side spring receiver 5 and the wheel side spring receiver 6. Yes. The vehicle body side spring receiver 5 is connected to the vehicle body side via the vehicle body side attachment member 8, and the wheel side spring receiver 6 is connected to the wheel side (swing arm side) via the wheel side attachment member 9. Yes.

  Further, the suspension device S of the present embodiment includes a link mechanism 7 interposed between the wheel side attachment member 9 and the swing arm A. The link mechanism 7 is connected to the frame B1 and the wheel-side attachment member 9 so as to be swingable and is formed in a substantially fan shape, and the first link member 70 and the swing arm A, respectively. It consists of the 2nd link member 71 connected so that rocking | fluctuation is formed in rod shape.

  Therefore, when an impact due to road surface unevenness is input to the rear wheel (not shown), the swing arm A swings up and down in FIG. 1, and accordingly, the first link member 70 via the second link member 71. Swings. As the first link member 70 swings, the wheel-side spring receiver 6 moves up and down in FIG. 1, so that the suspension spring 1 expands and contracts to generate a predetermined reaction force, and an impact caused by road surface unevenness is applied to the suspension spring 1. Can be absorbed.

  Further, the suspension device S includes an expansion limit restricting member 10 that limits the extension amount of the suspension spring 1, and the suspension spring 1 does not come off from the vehicle body side spring receiver 5 and the wheel side spring receiver 6 when the two-wheeled vehicle jumps. It is like that.

  Subsequently, as described above, the spring load adjusting mechanism 2 that adjusts the spring load of the suspension spring 1 is inserted inside the suspension spring 1 made of a coil spring, and the vehicle body side from the inside of the suspension spring 1 The spring receiver 5 can be moved up and down in FIG.

  Although various configurations can be adopted as the spring load adjusting mechanism 2, an example of the spring load adjusting mechanism 2 is shown in FIG. This spring load adjusting mechanism 2 is formed in a cylindrical shape, and the first case 20 in which the vehicle body side spring receiver 5 is slidably contacted with the inner peripheral surface is inserted inside the suspension spring 1 and is attached to the first case 20. A cylindrical second case 22 suspended through a rod 21, a piston 23 slidably in contact with the inner peripheral surface of the second case 22, and held on the opposite rod side of the second case 22 and the piston And a driving device 24 for driving the shaft 23 in the axial direction.

  A jack chamber J for accommodating oil is formed on the anti-suspension spring side (upper side in FIG. 2) of the vehicle body side spring receiver 5, and oil is also provided on the anti-drive device side (upper side in FIG. 2) of the piston 23. Working chamber R is formed, and the oil in jack chamber J and working chamber R freely moves between jack chamber J and working chamber R via flow path 21a formed in rod 21. can do.

  Further, the vehicle body side spring receiver 5 is formed in an annular shape and slidably contacts the outer peripheral surface of the rod 22 via an annular seal 5a attached to the inner periphery, and via an annular seal 5b attached to the outer periphery. The first case 20 is in sliding contact with the inner peripheral surface. Further, the piston 23 is formed in a disc shape and is in sliding contact with the inner peripheral surface of the second case 22 via an annular seal 23a attached to the outer periphery. For this reason, oil can be sealed in the jack chamber J and the working chamber R.

  Although not shown in detail, the drive device 24 includes a motor and a motion conversion mechanism that converts the rotational motion of the motor into the linear motion of the piston 23. The drive device 24 moves the piston 23 upward in FIG. The oil in the working chamber R moves to the jack chamber J through the flow path 21a and pushes down the vehicle body side spring receiver 5 to increase the volume of the jack chamber J. The spring load of the suspension spring 1 can be increased.

  Further, when the piston 23 is moved downward in FIG. 2 by the driving device 24, the oil in the jack chamber J moves to the working chamber R through the flow path 21a, and the suspension spring 1 pushes the vehicle body side spring receiver 5 upward. In order to reduce the volume of the jack chamber J, the spring load adjusting mechanism 2 can reduce the spring load of the suspension spring 1.

  In the present embodiment, the vehicle body side mounting member 8 is fixed to the first case 20, and the vehicle body side mounting member 8 is rotatably connected to the frame B1 (FIG. 1). Thereby, the suspension spring 1 can swing with respect to the vehicle body B when the suspension spring 1 expands and contracts.

  Next, the extension regulating member 10 for limiting the extension amount of the suspension spring 1 is also inserted inside the suspension spring 1 like the spring load adjusting mechanism 2, and as shown in FIG. A support cylinder 11 is provided which stands up at the center of the receiver 6 and is formed in a cylindrical shape and into which the second case 22 can be inserted and retracted as the suspension spring 1 expands and contracts. An annular one-side extension spring receiver 11a is formed at the tip of the support cylinder 11 so as to project toward the inner peripheral side.

  Further, the full extension restricting member 10 is formed so as to be held on the inner circumference of the one side full extension spring receiver 11 a and to protrude to the outer circumference side of the second case 22 and the annular bearing 12 that is in sliding contact with the outer circumference of the second case 22. And an annular other-side extension spring receiver 22a that is disposed on the wheel side spring receiver side (lower side in FIG. 2) with respect to the one-side extension spring receiver 11a and faces the inner peripheral surface of the support cylinder 11. An extension spring 13 is provided between the side extension spring receiver 11a and the other side extension spring receiver 22a.

  When the suspension spring 1 extends and the one side extension spring receiver 11a and the other side extension spring receiver 22a approach each other, the extension spring 13 is compressed to generate a reaction force. The impact at the time of extension can be absorbed by the extension spring 13.

  Furthermore, the buckling of the suspension spring 1 can be prevented because the second case 22 protrudes and retracts into the support cylinder 11 while being supported by the bearing 12 when the suspension spring 1 is expanded and contracted.

  In the present embodiment, the bump rubber 14 is disposed inside the support cylinder 11 so as to face the bottom of the second case 22. When the suspension spring 1 is compressed and the second case 22 and the wheel side spring receiver 6 approach each other, the bump rubber 14 is compressed and generates a reaction force, so that the amount of compression of the suspension spring 1 is limited, The impact at the time of the most compression can be absorbed by the bump rubber 14.

  In the present embodiment, a wheel side attachment member 9 is fixed to the wheel side spring receiver 6 and the wheel side attachment member 9 is rotatably connected to the link 7 (FIG. 1). As a result, the suspension spring 1 can swing with respect to the link 7 during expansion and contraction.

  Subsequently, the shock absorber that suppresses the expansion and contraction motion associated with the shock absorption of the suspension spring 1 includes the rotary damper 3. In the present embodiment, the rotary damper 3 includes the wheel side mounting member 9, the first link member 70, and the like. (Fig. 1).

  Although various configurations can be adopted as the rotary damper 3, an example of the rotary damper 3 is shown in FIG. As described above, the rotary damper 3 includes a housing 30 that is formed in a hollow shape, and a shaft 31 that is rotatably inserted into the housing 30.

  In the present embodiment, the housing 30 is attached to the first link member 70 so as not to be relatively rotated, and the shaft 31 is attached to the wheel side attaching member 9 so as not to be relatively rotated. For this reason, the shaft 31 rotates with respect to the housing 30 as the swing arm A swings.

  Further, the rotary damper 3 is provided with a cylindrical gap (not shown) formed between the housing 30 and the shaft 31, and this gap stands in the radial direction from the inner peripheral surface of the housing 30. Thus, a pair of partition walls 30a and 30b facing each other is partitioned into two rooms R1 and R2. The chambers R1 and R2 are partitioned into a first chamber r1 and a second chamber r2 by a pair of vanes 31a and 31b that rise in the radial direction from the outer peripheral surface of the shaft 31. That is, the gap formed between the housing 30 and the shaft 31 is divided into four (r1, r1, r2, r2) by the partition walls 30a, 30b and the vanes 31a, 31b.

  In addition, the one chambers r1 and r1 and the other chambers r2 and r2 of the rooms R1 and R2 are alternately arranged so that the one chambers r1 and r1 and the other chambers r2 and r2 are not adjacent to each other. The one chambers r1 and r1 and the other chambers r2 and r2 of each of the chambers R1 and R2 are filled with a working fluid made of liquid or gas such as water or oil.

  Each of the vanes 31a and 31b is formed with a flow path L communicating the one chamber r1 and the other chamber r2, and the flow paths L and L are operated through the flow path L. Damping force generating means V for providing resistance to the fluid is provided.

  Then, when the shaft 31 rotates to one side (right side in FIG. 3) with respect to the housing 30 and the one chambers r1 and r1 of the chambers R1 and R2 are pressurized by the vanes 31a and 31b, the one chamber r1. , R1 passes through the flow paths L, L and moves to the other chambers r2, r2. Further, when the shaft 31 rotates to the other side (left side in FIG. 3) with respect to the housing 30 and the other chambers r2 and r2 of the chambers R1 and R2 are pressurized by the vanes 31a and 31b, respectively, the other chamber r2. , R2 passes through the flow paths L, L and moves to the one chambers r1, r1.

  For this reason, the rotary damper 3 generates a damping force due to the resistance of the damping force generation means V when the working fluid passes through the flow path L, and prevents the shaft 31 from rotating with respect to the housing 30. . Since the wheel side attachment member 9 cannot rotate relative to the shaft 31 and the first link member 70 cannot rotate relative to the housing 30, relative rotation between the wheel side attachment member 9 and the first link member 70 is suppressed. Therefore, the rotary damper 3 can suppress the swing of the swing arm A and can suppress the expansion and contraction movement of the suspension spring 1 due to the impact absorption.

  Hereinafter, the function and effect of the suspension device S according to the present embodiment will be described. The suspension device S of the present embodiment includes a hollow housing 30, a shaft 31 that is rotatably inserted into the housing 30 and rotates as the swing arm A swings and the suspension spring 1 extends and contracts, and the shaft 31. The rotary damper 3 is provided with damping force generating means V that suppresses the rotation of the rotary damper 3.

  That is, in the present embodiment, since the conventional shock absorber is disposed outside the suspension spring 1 made of a coil spring as the rotary damper 3, the spring load adjusting mechanism 2 is inserted inside the suspension spring 1, The spring load of the suspension spring 1 can be adjusted from the inside of the suspension spring 1.

  Therefore, even if the spring load adjusting mechanism 2 is provided and the spring load of the suspension spring 1 can be adjusted, the suspension device S is not bulky, and the layout can be made more flexible than the conventional suspension device.

  In the present embodiment, the suspension spring 1 is attached to the swing arm A via the link mechanism 7 to increase the lever ratio. The rotary damper 3 is embodied in a swinging portion between a wheel side attachment member 9 fixed to a wheel side spring receiver 6 that carries the suspension spring 1 and a link mechanism 7. For this reason, the relative rotation angle between the housing 30 and the shaft 31 is increased, and a damping force can be reliably generated.

  In the present embodiment, since the extension regulating member 10 that restricts the extension amount of the suspension spring 1 is inserted inside the suspension spring 1, the suspension device S includes the extension regulation member 10. Even if it is not bulky, it is possible to prevent the suspension spring 1 from being detached from the vehicle body side spring receiver 5 and the wheel side spring receiver 6.

  In the present embodiment, the suspension spring 1 is interposed between the vehicle body side spring receiver 5 and the wheel side spring receiver 6, and the spring load adjusting mechanism 2 is inserted inside the suspension spring 1. A second case 22 is provided on the vehicle body side spring receiving side (upper side in FIGS. 1 and 2).

  Further, the extension regulating member 10 is disposed on the wheel side spring receiving side (the lower side in FIGS. 1 and 2) and is inserted into the suspension spring 1 while the extension spring 10 is expanded and contracted as the suspension spring 1 expands and contracts. A cylindrical support cylinder 11 into which the two cases 22 can be inserted and retracted, an annular one-side extension spring receiver 11a formed to project from the front end of the support cylinder 11 toward the inner peripheral side, and the second case 22 A ring-shaped other-side extension spring receiver 22a that is formed to project to the outer peripheral side of the support cylinder 11 and faces the inner peripheral surface of the support cylinder 11, and the one-side extension spring receiver 11a and the other-side extension spring receiver 22a. An extension spring 13 disposed between them and an annular bearing 12 that is held on the inner periphery of the one-side extension spring receiver 11 and is in sliding contact with the outer peripheral surface of the second case 22 are provided.

  With the above configuration, when the suspension spring 1 extends and the one-side extension spring receiver 11a and the other-side extension spring receiver 22a approach each other, the extension spring 13 is compressed and generates a reaction force. The extension amount of the spring 1 is limited, and the impact at the time of extension can be absorbed by the extension spring 13.

  Further, since the second case 22 is supported by the bearing 12 and protrudes into and out of the support cylinder 11 when the suspension spring 1 is expanded and contracted, buckling of the suspension spring 1 can be prevented.

  Although preferred embodiments of the present invention have been described in detail above, it should be understood that modifications, variations and changes may be made without departing from the scope of the claims.

  For example, although the suspension device S according to the above embodiment suspends the rear wheel of the motorcycle, the suspension device is not limited to this, and may be a suspension device for other transportation equipment.

  Moreover, in the said embodiment, although the spring load adjustment mechanism 2 moves the vehicle body side spring receiver 5, not only this but the wheel side spring receiver 6 may be moved.

  Moreover, in the said embodiment, although the spring load adjustment mechanism 2 moves the vehicle body side spring receiver 5 using oil_pressure | hydraulic, the vehicle body side spring receiver 5 or the wheel side spring receiver 6 is moved only by the force of a motor. It is good.

  Further, the configuration of the extension regulating member 10 that limits the extension amount of the suspension spring 1 is not limited to the above, and a configuration can be appropriately adopted. For example, even if the second case 22 of the spring load adjusting mechanism 2 is arranged on the wheel side spring receiving side (lower side in FIG. 2) and the support cylinder 11 is arranged on the vehicle body side spring receiving side (upper side in FIG. 2). Good. Further, the extension regulating member 10 includes a bearing 12, but instead of this bearing 12, an annular bearing that is held on the outer periphery of the other side extension spring receiver 22 a and is in sliding contact with the inner peripheral surface of the support cylinder 1 is provided. However, both the bearing and the bearing 12 may be provided.

  Further, the configuration for limiting the compression amount of the suspension spring 1 is not limited to the above, and a configuration other than the bump rubber 15 may be adopted.

  Further, in the above embodiment, the rotary damper 3 is embodied in the swinging portion of the wheel side mounting member 9 and the first link member 70. However, the present invention is not limited to this, and the relative rotation occurs when the swing arm A swings. It may be embodied in any part. For example, the swing part of the first link 70 and the second link 71, the swing part of the first link 70 and the frame B1, the swing part of the swing arm A and the second link 71, and the swing of the swing arm A and the frame B1. It can be provided in the part.

  One of the two members (for example, the wheel side attachment member 9 and the first link member 70, the swinging portion of the first link 70 and the second link 71, etc.) that rotates relative to each other when the swing arm A swings. It is only necessary that the housing 30 is attached and the shaft 31 is attached to the other side.

Further, the structure of the link mechanism 7 is not limited to the above, and a lever ratio adjusting mechanism for shifting the swing center of the first link member 70 and the second link member 71 to the left and right in FIG. Also good.

A swing arm B vehicle body B1 frame L, 21a flow path J jack chamber R working chamber R1, R2 chamber r1 one chamber r2 other chamber V damping force generating means 1 suspension spring 2 spring load adjustment mechanism 3 rotary damper 4 pivot shaft 5 vehicle body side Spring receiver 6 Wheel side spring receiver 7 Link mechanism 8 Car body side attaching member 9 Wheel side attaching member 20 First case 21 Rod 22 Second case 23 Piston 24 Drive device 30 Housing 30a, 31b Partition 31 Shaft 31a, 31b Vane 70 First One link member 71 Second link member

Claims (7)

A suspension spring interposed between the vehicle body and a swing arm that is swingably connected to the vehicle body and supports the rear wheel; a spring load adjustment mechanism that adjusts a spring load of the suspension spring; and In a suspension device comprising a vehicle body side spring receiver that supports one end and a wheel side spring receiver that supports the other end of the suspension spring,
A rotary housing including a hollow housing, a shaft that is rotatably inserted into the housing and rotates as the swing arm swings and the suspension spring expands and contracts, and a damping force generation unit that suppresses the rotation of the shaft. With a damper,
With an extension limit restricting member that limits the extension amount of the suspension spring,
The suspension device, wherein the suspension spring is a coil spring, and the spring load adjusting mechanism and the extension regulating member are inserted inside the suspension spring. A suspension spring interposed between the vehicle body and a swing arm that is swingably connected to the vehicle body and supports the rear wheel; a spring load adjustment mechanism that adjusts a spring load of the suspension spring; and In a suspension device comprising a vehicle body side spring receiver that supports one end and a wheel side spring receiver that supports the other end of the suspension spring,
A rotary housing including a hollow housing, a shaft that is rotatably inserted into the housing and rotates as the swing arm swings and the suspension spring expands and contracts, and a damping force generation unit that suppresses the rotation of the shaft. With a damper,
The suspension spring is a coil spring,
The spring load adjusting mechanism includes: a jack chamber that raises or lowers one of the vehicle body side spring receiver or the wheel side spring receiver; a working chamber that communicates with the jack chamber; and oil in the working chamber that sends or returns oil to the jack chamber. And a driving device for driving the piston,
The suspension device, wherein the working chamber, the piston, and the driving device are provided inside the suspension spring.   3. The suspension device according to claim 2, wherein an extension limit restricting member for limiting an extension amount of the suspension spring is inserted inside the suspension spring. Receiving the wheel-side spring is fixed to the vehicle wheel side mounting member,
Suspension system according to any one of claims 1 to 3, characterized in that the wheel-side mounting member is attached to the swing arm via a link mechanism.   The suspension apparatus according to claim 4, wherein the rotary damper is embodied in a swinging portion between the wheel side attachment member and the link mechanism. The spring load adjusting mechanism includes a second case that is inserted inside the suspension spring and disposed on one side of the vehicle body side spring receiver or the wheel side spring receiver,
The full extension restricting member is disposed on the other side of the vehicle body side spring receiver or the wheel side spring receiver and is inserted inside the suspension spring, and the second case protrudes and retracts as the suspension spring expands and contracts inside. A cylindrical support cylinder that can be inserted, an annular one-side extension spring receiver formed on the tip of the support cylinder on the inner peripheral side, and an outer peripheral side of the second case. An annular other-side extension spring receiver facing the inner peripheral surface of the support cylinder, and an extension spring disposed between the one-side extension spring receiver and the other-side extension spring receiver;
An annular bearing that is held on the inner periphery of the one-side extension spring receiver and is in sliding contact with the outer peripheral surface of the second case; and an inner peripheral surface of the support cylinder that is held on the outer periphery of the other-side extension spring receiver 6. The suspension device according to claim 1, further comprising at least one of annular bearings that are in sliding contact with each other. The spring load adjusting mechanism is inserted inside the suspension spring and disposed on one side of the vehicle body side spring receiver or the wheel side spring receiver, and the working chamber is formed therein and the piston is movable. A second case to be inserted,
The full extension restricting member is disposed on the other side of the vehicle body side spring receiver or the wheel side spring receiver and is inserted inside the suspension spring, and the second case protrudes and retracts as the suspension spring expands and contracts inside. A cylindrical support cylinder that can be inserted, an annular one-side extension spring receiver formed on the tip of the support cylinder on the inner peripheral side, and an outer peripheral side of the second case. An annular other-side extension spring receiver facing the inner peripheral surface of the support cylinder, and an extension spring disposed between the one-side extension spring receiver and the other-side extension spring receiver;
An annular bearing that is held on the inner periphery of the one-side extension spring receiver and is in sliding contact with the outer peripheral surface of the second case, and an inner peripheral surface of the support cylinder that is held on the outer periphery of the other-side extension spring receiver 6. The suspension device according to claim 3, wherein the suspension device includes at least one of annular bearings that are in sliding contact with each other.

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