JP4858979B2 - Spring force adjustment structure - Google Patents

Description

  The present invention relates to a spring force adjusting structure, and in particular, a spring force suitable for implementation in a front fork as a hydraulic shock absorber that is mounted on the front wheel side of a two-wheeled vehicle and absorbs road surface vibration that is input to the front wheel of the two-wheeled vehicle that is running. It relates to the improvement of the adjustment structure.

  Various proposals have been made so far for a spring force adjustment structure suitable for implementation in a front fork that is a hydraulic shock absorber that is mounted on the front wheel side of a motorcycle and absorbs road surface vibrations that are input to the front wheel of a traveling motorcycle. is there.

  Among them, for example, in the proposed spring force adjustment structure disclosed in Patent Document 1, the structure is accommodated in a front fork, that is, in a fork main body including a vehicle body side tube and a wheel side tube. The spring force of the suspension spring comprising a coil spring that urges the fork main body in the extending direction can be adjusted in height by rotating the adjuster.

  That is, the front fork is configured as a damper built-in type having a cylindrical damper that is a one-rod type in the axial center portion of the fork main body that includes the vehicle body side tube and the wheel side tube. An adjuster is provided on the shaft core portion of the cap member that is connected to the upper end portion and closes the upper end of the vehicle body side tube, and the spring force of the suspension spring can be adjusted by rotating the adjuster. It is said.

  By the way, the adjuster is arranged at the shaft core part of the cap member, and the upper end of the suspension spring is moved up and down at the time of rotation while the upper end of the suspension spring is locked to the lower end under the spacer. At this time, the rod body constituting the damper, that is, the piston rod is not moved up and down by a so-called accompanying movement.

Therefore, in the spring force adjusting structure disclosed in Patent Document 1, when adjusting the spring force of the suspension spring, the front fork can adjust the height of the front wheel side of the two-wheeled vehicle and the damper The set expansion / contraction stroke is not changed, and the damping force as set can be generated.
Japanese Utility Model Publication No. 7-44833 (see Claims for Utility Model Registration, FIG. 1, FIG. 2 and FIG. 3)

  However, in the spring force adjustment structure disclosed in Patent Document 1 described above, there is a special problem in that the adjustment of the spring force level of the suspension spring accommodated in the front fork can be practiced as desired. Although there is not, there is a possibility that it is pointed out that there is a slight problem with ensuring the operation performance of the front fork.

  That is, in the above-described spring force adjustment structure, the adjuster is arranged on the shaft core portion of the upper end side portion of the cap member connected to the upper end portion of the vehicle body side tube. The part is formed to be long enough to be present inside the spacer connected to the upper end of the suspension spring. In other words, the bottom of the rod body constituting the damper, that is, the upper end of the piston rod is integrally formed. It is going to be connected.

  By the way, in a front fork mounted on the front wheel side of a motorcycle, the axis line is bent between the vehicle body side tube and the wheel side tube when braking the motorcycle or landing after jumping. A situation may appear.

  At this time, in the damper disposed on the shaft core portion of the front fork, the cylinder body that stands up at the shaft core portion while being integrally connected to the wheel side tube and the upper end is integrated with the vehicle body side tube. Bending occurs between the piston rod and the above-described piston rod that is suspended from the shaft core and is inserted into the cylinder so as to be able to protrude and retract.

  As a result, in a front fork mounted on the front wheel side of a two-wheeled vehicle, when the two-wheeled vehicle is braked or landing after jumping, a built-in damper is provided between a cylinder body and a rod body that is a piston rod. A bending phenomenon may occur, and if the damper is contracted while the bending phenomenon is expressed, the bending phenomenon may occur in the damper, and the operation performance of the damper may not be guaranteed.

  Therefore, the present invention has been made in view of the above-described circumstances, and the object of the invention is to allow adjustment of the spring force of the suspension spring accommodated in the front fork. That is, it is to provide a spring force adjusting structure that can permanently guarantee the operation performance of the damper built in the front fork and is optimal for expecting improvement in versatility of the front fork.

In order to achieve the above object, the structure of the spring force adjusting structure according to the present invention is basically a suspension for energizing the fork main body in the extending direction within the fork main body composed of the vehicle body side tube and the wheel side tube. The fork main body has a spring and a damper at the shaft core portion, and a cap member connected to the upper end portion of the vehicle body side tube has an adjuster at the lower end of the adjuster, and a spring support is brought into contact with the lower end of the adjuster. In the spring force adjustment structure in which the upper end of the suspension spring is moved up and down via a spring receiver by the rotation operation of the adjuster, and the height of the spring force in the suspension spring can be adjusted, the cap member is formed in a flange shape. A connecting portion formed in a cylindrical shape that is connected to the outer peripheral side end portion of the lid portion and connected to the inner periphery of the upper end portion of the vehicle body side tube, and the inner peripheral side end portion of the lid portion. The And the guide portion of the cylindrical formation to Justa pivotally and vertically movably mounted to, and a tubular space portion between the connecting portion and the guide portion, the adjuster on the inner periphery of the lower end portion of the guide portion The outer periphery of the lower end of the holder is connected by screwing, and the inner periphery of the upper end of the holder member is screwed and connected to the outer periphery of the lower end of the guide, and the holder member constitutes a damper on the shaft core of the lower end It is assumed that the upper end portion of the rod body to be screwed is screwed and an intermediate portion between the upper end portion and the lower end portion of the holder member is formed in a bifurcated shape, and the spring receiver is accommodated in the inner side so as to be movable up and down.

  Therefore, in the present invention, the adjuster is provided at the shaft core portion of the cap member connected to the upper end portion of the vehicle body side tube constituting the front fork, and the spring receiver is brought into contact with the lower end of the adjuster. Therefore, by moving the spring receiver up and down by the adjuster turning operation, the upper end of the suspension spring can be moved up and down to enable adjustment of the spring force of the suspension spring. The vehicle height can be adjusted.

  When the upper end of the upper end of the suspension spring is moved up and down by this adjuster, the rod body does not move with the damper built in the front fork. Therefore, the set expansion / contraction stroke of the damper is not changed, and the damping force as set. Can be made possible.

  And in this invention, the cap member is formed in a cylindrical shape that is connected to the inner periphery of the upper end portion of the vehicle body side tube connected to the outer peripheral side end portion of the lid portion and the lid portion formed in a flange shape. A connecting portion that is formed, and a guide portion that is formed in a cylindrical shape that is connected to the inner peripheral end of the lid portion so that the adjuster can be rotated and moved up and down, and between the guide portion and the connecting portion. Since the upper end portion of the holder member is connected to the outer periphery of the lower end portion of the guide portion while making the cylindrical space portion, when the bending force from the rod body acts on the cap member via the holder member, A part comes to bend and it becomes possible to absorb the bending force from a holder member.

  Further, in the present invention, since the cap member having the adjuster and the holder member for screwing the rod body are separated from each other, the processing of each is facilitated and the adjuster is attached to the cap member. So-called assembly becomes easier.

  In the present invention, the holder member screwes the upper end portion of the rod body constituting the damper to the shaft core portion of the lower end portion, and the intermediate portion between the upper end portion and the lower end portion of the holder member is provided. Since it is formed in a bifurcated shape and the spring receiver is accommodated in the inner side so as to be movable up and down, it is easy to accommodate the spring receiver inside the intermediate portion, and the assemblability is improved.

  As a result, according to the present invention, it is possible to adjust the spring force of the suspension spring accommodated in the front fork, as well as the cylinder body and the rod body in the damper built in the front fork. No bending will occur between the two and therefore the operating performance will be permanently guaranteed.

  In the following, the present invention will be described based on the illustrated embodiment. The spring force adjusting structure according to the present invention is assumed to be embodied in a front fork with a built-in damper. The fork is assumed to function as a hydraulic shock absorber that is mounted on the front wheel side of a motorcycle such as a motorcycle and absorbs road surface vibrations that are input to the front wheel of the traveling motorcycle.

  That is, as shown in FIGS. 1 and 2, the illustrated front fork has a fork main body (not shown) formed of a vehicle body side tube 1 and a wheel side tube 2 indicated by a virtual diagram in the figure. The fork body has a suspension spring (not shown) and a damper (not shown) in the shaft core portion of the fork main body.

  By the way, in the figure, the fork main body is set to be an inverted type in which the vehicle body side tube 1 is an outer tube having a large diameter and the wheel side tube 2 is an inner tube having a small diameter. In view of the intention of the present invention, the fork main body may be set to be an upright type in which the vehicle body side tube 1 is made of a small diameter inner tube and the wheel side tube 2 is made of a large diameter outer tube. Of course.

  As for the damper, in the drawing, it is assumed that it is a cylinder and is a single rod type. Although not shown, the cylinder body constituting this damper is integrated with the bottom of the wheel side tube 2 at the lower end. It is assumed that it is erected on the shaft core portion of the wheel side tube 2 by being connected.

  In addition, the rod body 11 as a piston rod that similarly constitutes this damper and is inserted into the cylinder body so that the lower end side that is the distal end side can be protruded and retracted is, as shown, a holder member 7 whose upper end portion 11a that is the base end portion is described later. As a result, it is supposed to be suspended from the shaft core portion of the vehicle body side tube 1 as a result.

By the way, in the illustrated front fork, the adjuster 4 is provided at the shaft core portion of the cap member 3 connected to the upper end portion 1a of the vehicle body side tube 1, and the spring receiver 5 is brought into contact with the lower end of the adjuster 4, The spacer 6 is provided between the spring receiver 5 and the suspension spring, and the upper end of the suspension spring is moved up and down through the spring receiver 5 and the spacer 6 by the rotation operation of the adjuster 4 to adjust the height of the spring force in the suspension spring. It is supposed to be possible.

  Incidentally, in the illustrated case, a ring seat 51 is disposed between the spring receiver 5 and the spacer 6, and this ring seat 51 is provided in the present invention as will be described later. This is because it is formed so as to exhibit a unique planar shape, and the presence of the ring seat 51 realizes a state in which the upper end of the spacer 6 that is annular is in contact with the spring receiver 5 evenly. Will be.

  In addition, the spacer 6 is disposed in order to avoid increasing the weight of the front fork by forming the suspension spring to be unnecessarily long. In many cases, the spacer 6 has substantially the same diameter as the suspension spring. It is formed in a cylindrical shape and appropriately has a communication hole 6a that allows hydraulic oil to pass through on the inner and outer peripheral sides.

  In view of the intention of the present invention, the spacer 6 is not disposed. Therefore, an intermediate portion 7c of the holder member 7 described later is an upper end portion of a suspension spring (not shown). Of course, it may be present inside.

  The cap member 3 is connected to the upper end portion 1a of the vehicle body side tube 1, that is, as shown in the figure, is screwed onto the inner periphery of the upper end portion 1a of the vehicle body side tube 1 to seal the upper end of the vehicle body side tube 1 Therefore, a seal member 31 is disposed between the cap member 3 and the vehicle body side tube 1.

  As shown in FIG. 3A, the cap member 3 is connected to the lid portion 3a formed in a flange shape and the outer peripheral side end portion of the lid portion 3a, so that the vehicle body side tube 1 (FIG. 1 and FIG. 2), a connecting portion 3b formed in a cylindrical shape that is screwed to the inner periphery of the upper end portion 1a, and an adjuster 4 that is connected to the inner peripheral end of the lid portion 3a and that can rotate and move up and down. And a guide portion 3c formed in a cylindrical shape to be attached to the body.

  In addition, the cap member 3 is a holder member 7 whose lower end is located inside the spacer 6 on the outer periphery of the lower end portion of the guide portion 3c while the cylindrical space portion 3d is formed between the guide portion 3c and the connecting portion 3b. The upper end portion 7a is screwed (see FIGS. 1 and 2).

  By the way, the cap member 3 may be formed of any material and by any means as long as it has the lid portion 3a, the coupling portion 3b, the guide portion 3c, and the space portion 3d, which are the above-described components. If it is advantageous in terms of weight reduction and part cost while having a predetermined mechanical strength, it is preferable to cast it with an aluminum material, for example.

  At this time, in the cap member 3, the lid portion 3 a allows so-called bending, and the connecting portion 3 b and the guide portion 3 c allow connection to other members or connection of other members, It is necessary and sufficient that it is formed so as not to increase the wall thickness so as to have a predetermined mechanical strength.

  As described above, the cap member 3 has a cylindrical space portion 3d between the guide portion 3c and the connecting portion 3b. Therefore, when the guide portion 3c swings with respect to the connecting portion 3b, that is, When the axial core line of the connecting portion 3c indicated by the symbol a in FIG. 3A is inclined like the axial core wire indicated by the symbol b or c in FIG. This is allowed to bend.

  As a result, according to the present invention, even when a bending phenomenon occurs between the vehicle body side tube 1 and the wheel side tube 2, as a result, the vehicle body side tube 1 is connected via the cap member 3. The rod body 11 (see FIG. 1 and FIG. 2) that has been made can have the same axial center line as that of the cylinder body connected to the wheel side tube 2, and the damper is actuated during operation. Will not be.

  Moreover, in this invention, since the cap member 3 is formed so as to be thin, the weight of components included as the cap member 3 is reduced, and as a result, it can contribute to the weight reduction in the front fork. .

  By the way, it is disposed on the shaft core portion of the cap member 3 described above, that is, is attached to the shaft core portion of the cap member 3 so as to be rotatable and vertically movable, and the lower end is brought into contact with a spring receiver 5 described later. As for the adjuster 4, as shown in FIGS. 1 and 2, this adjuster 4 is formed in a cylindrical shape and has a sub-adjuster 41 inside.

  The adjuster 4 has an upper end protruding from the upper end of the cap member 3 to the outside, and a lower end screwed into the inner periphery of the guide portion 3c (see FIG. 3A) in the cap member 3. For example, it is assumed that the cap member 3 is moved up and down by a turning operation performed by the rider.

  Further, the adjuster 4 has a snap ring 8 fitted on the outer periphery of the lower end portion 4a, and the snap ring 8 is brought into contact with the lower end of the guide portion 3c in the cap member 3. Thus, the adjuster 4 is prevented from coming off from the guide portion 3c.

  Therefore, in the adjuster 4, when the cap member 3 is attached to the shaft core portion of the cap member 3, the cap member 3 is in a state of being separated from the holder member 7 described later. Therefore, the so-called assemblability can be improved.

  In the adjuster 4, when the adjuster 4 is rotated so as to be screwed into the cap member 3, the spring receiver 5 is pushed down, and the adjuster 4 is reversed and pulled out from the cap member 3. When this happens, the spring receiver 5 is allowed to rise.

At this time, since the holder member 7 is connected to the cap member 3 and does not move with respect to the turning operation of the adjuster 4, the rod body 11 constituting the damper connected to the holder member 7 moves together. That is, it does not move up and down, and the damping force can be generated as set without changing the set expansion / contraction stroke in the damper.

  On the other hand, regarding the sub-adjuster 41, the sub-adjuster 41 moves up and down the control rod 12 housed in the shaft core portion of the rod body 11 constituting the damper by a feed screw mechanism. It is assumed that the shaft core part is accommodated so as to be rotatable without moving up and down.

  A vertical groove 41 a is formed on the lower end side of the sub-adjuster 41, and the head portion 42 a of the feed member 42 is introduced into the vertical groove 41 a. Therefore, the feed member 42 is connected to the sub-adjuster 41. It is rotated in synchronization with the rotation and moves up and down.

  Further, the feed member 42 is connected to the lower end portion 42b while the lower end portion 42b is connected to the lower end portion 7b of the holder member 7 to be described later while the lower end portion 42b is connected to the upper end portion 12a of the control rod 12. It is going to be screwed.

  Therefore, in the feed screw mechanism having the feed member 42 described above, the control rod 12 can be raised and lowered by the rotation of the sub adjuster 41. It is possible to adjust some of the flow rate of the working oil in the bypass passage that bypasses the damping valve disposed in the piston portion that is connected to the lower end portion of the rod body 11.

  Incidentally, the sub adjuster 41 has a so-called edge cut off from the adjuster 4 and is connected to the holder member 7 by a feed screw mechanism. Further, the sub adjuster 41 may be connected to the detent mechanism D. When the adjuster 4 is rotated, it does not move.

  Then, when the sub adjuster 41 is rotated, the adjuster 4 is not rotated by the accompanying movement because the rotation torque of the adjuster 4 is larger than the rotation torque of the sub adjuster 41 as is well known.

  On the other hand, as shown in FIG. 3B, the holder member 7 has an upper end 7a, a lower end 7b, and an intermediate portion 7c between the lower end 7b and the upper end 7a. Both the part 7a and the lower end part 7b are formed in a cylindrical shape, and the intermediate part 7c is formed in a bifurcated shape.

  That is, in the holder member 7, the upper end portion 7 a is screwed to the outer periphery of the guide portion 3 c of the cap member 3 as shown in FIGS. 1 and 2, and the lower end portion 7 b is a rod body. 11 is screwed together with the lock nut 13 together.

  By the way, in this holder member 7, the intermediate portion 7 c is formed in a bifurcated shape. The specific shape will be described as shown in FIGS. 1, 2, and 3 (B). First, the intermediate portion 7c is formed in a cylindrical shape so as to allow the feed member 42 to be provided in the feed screw mechanism and to have a space sufficient for the spring receiver 5 to be provided. It is going to be.

  At this time, the intermediate portion 7c has a structure in which the outer periphery of the intermediate portion 7c is adjacent to the inner periphery of the cylindrically formed spacer 6 without causing a so-called mischievous gap so that the spacer 6 does not rattle in the radial direction. To maintain.

  And in the display of the holder member 7 in FIG. 3B, the left side in the figure shows a state in which a hole 7e described later extends in the front-rear direction, and the right side in the figure shows the hole 7e in the left-right direction. Although shown in an open state, the intermediate portion 7c is formed in a two-sided width structure having a vertical surface 7d composed of a pair of missing surfaces that face each other in the diametrical direction, and The hole 7e penetrating in the diameter direction is formed in the vertical surface 7d.

  Therefore, in the holder member 7, it is possible to easily house the spring receiver 5 inside the intermediate portion 7c before it is connected to the cap member 3 described above. The assembly work for realization will be facilitated.

  On the other hand, as shown in FIG. 1 and FIG. 2, the spring receiver 5 described above is formed in an annular shape and is housed inside the intermediate portion 7 c of the holder member 7, and the main body 5 a. A pair of flanges 5b that protrude outward from the intermediate portion 7c of the holder member 7 and are in contact with the upper end of the spacer 6 under the arrangement of the ring seat 51 while being connected to the outer peripheral side end in the diameter direction of the portion 5a. It is said to have.

  Therefore, in the spring receiver 5, if the cap member 3 and the holder member 7 are integrally formed, they are electrically connected to the communication hole 7e opened in the intermediate portion 7c of the holder member 7. In this case, it is a proposal disclosed in Patent Document 1 that the work is not easy.

  On the other hand, in this invention, since the cap member 3 and the holder member 7 are formed so as to be divided, the intermediate portion 7c of the holder member 7 at the predetermined position as described above, as described above. Thus, it is possible to carry out the operation of arranging the inside of the door very easily.

  Therefore, in the spring force adjusting structure of the present invention formed as described above, the upper end of the suspension spring is moved up and down by the rotation operation of the adjuster 4 so that the height of the spring force in the suspension spring can be adjusted. Thus, the vehicle height on the front wheel side of the motorcycle can be adjusted at the front fork.

  When the upper end of the suspension spring is moved up and down by the turning operation of the adjuster 4, the rod body 11 does not move with the built-in damper. Therefore, the set expansion / contraction stroke in the damper is not changed, and as set. Therefore, it is possible to generate a damping force.

  In the present invention, the cap member 3 allows distortion of the guide portion 3c for connecting the holder member 7, that is, with respect to the connecting portion 3b in the cap member 3 connected to the upper end portion 1a of the vehicle body side tube 1. Since the bending is allowed, the bending force from the rod body 11 connected to the holder member 7 can be absorbed, the occurrence of the bending phenomenon in the damper is avoided, and the operation performance in the damper is guaranteed. Become.

  Further, according to the present invention, since the cap member 3 having the adjuster 4 and the holder member 7 to which the rod body 11 is screwed are separated, the processing of each of them becomes easy and the cap member 3 is also made. So-called assembly, such as mounting of the adjuster 4 to the head, becomes easy.

  Further, in the present invention, the holder member 7 screws the upper end portion 11a of the rod body 11 constituting the damper to the shaft core portion of the lower end portion 7b, and at the same time, the upper end portion 7a and the lower end portion 7b of the holder member 7 Since the intermediate portion 7c between the two is formed in a bifurcated shape and the spring receiver 5 is accommodated inside the intermediate portion 7c so as to be vertically movable, the spring receiver 5 can be easily accommodated inside the intermediate portion 7c. Assemblability will be improved.

  In addition to the above, in the present invention, the following considerations are also made. Therefore, this will be explained a little, but first, as an impact mitigation means when the fork main body contracts most, As shown in FIG. 1 and FIG. 2, a stopper 9 is provided inside the upper end portion 1 a of the vehicle body side tube 1 to allow contact of the upper end of the wheel side tube 2.

  As shown in FIG. 4, the stopper 9 is formed of a rubber material or the like in an annular shape having an appropriate thickness, and is formed of a steel plate or the like and is adjacent to a so-called back surface of the elastic body 9a. The sheet 9b has an outer diameter that matches the outer diameter of the elastic body 9a, has an inner peripheral side deformed into a chrysanthemum shape, and protrudes inward on the inner peripheral side. A stepped portion (indicated by a symbol) formed on the upper end portion 7a of the holder member 7 is in contact with a plurality of portions.

  That is, in the stopper 9, the holder member 7 is coupled to the cap member 3 when the back surface of the sheet portion 9 b is in contact with the lower end of the coupling portion 3 b of the cap member 3. Thus, it is fixedly arranged at a fixed position.

  Incidentally, the stopper 9 may be connected in advance to the lower end of the connecting portion 3b of the cap member 3 by any means, but in the present invention, the cap member 3 and the holder member 7 have a so-called separation structure. Since both of them are screwed together to form a single part, the cap member 3 and the holder member can be used in this way, rather than being connected to the cap member 3 in advance. It can be said that it is advantageous from various points that it is arranged at a predetermined position when connecting the two.

  Next, as described above, in the present invention, the detent mechanism D is provided to prevent the sub adjuster 41 from moving together when the adjuster 4 is rotated. As shown in FIGS. 1 and 2, the detent mechanism 20 is provided from the viewpoint of ensuring the operability when the adjuster 4 is rotated.

  That is, as shown in FIG. 5, the detent mechanism 20 includes a linear spring 21 formed so as to exhibit a unique planar shape. The linear spring 21 is first split 21a. It is supposed that the end portion 21b forming the split 21a can be expanded so-called.

  The linear spring 21 has a straight portion 21c continuous with the end portion 21b, and the straight portion 21c forms a two-sided width structure in the intermediate portion 7c of the holder member 7. This is adjacent to the surface 7 d, thereby preventing the linear spring 21 from idling around the outer periphery of the intermediate portion 7 c of the holder member 7.

  On the other hand, the linear spring 21 has a bent portion 21d that has a valley shape when viewed from the center side on the side facing the above-mentioned split, and the sharp end of the bent portion 21d is the lower end of the adjuster 4. In 4a, it is supposed to be fitted into a hole 4b (see FIG. 2) opened in the radial direction.

  Therefore, in this detent mechanism 20, when the adjuster 4 is rotated and the lower end portion 4 a is rotated, a so-called linear rotation is prevented so as not to cause a sharpness. It becomes possible.

It is a longitudinal cross-sectional view which shows partially the upper end side part in the front fork by this invention. It is a partial longitudinal cross-sectional view shown by the cross section orthogonal to the cross section of FIG. (A) is a longitudinal cross-sectional view which shows a cap member, (B) is a longitudinal cross-sectional view which shows a holder member in the angle which is different in right and left which pinches | interposes a center line. It is a bottom view of the stopper shown by the X1-X1 line position in FIG. It is a top view of the detent mechanism shown by the X2-X2 line position in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body side tube 1a, 7a, 11a Upper end part 2 Wheel side tube 3 Cap member 3a Lid part 3b Connection part 3c Guide part 3d Space part 4 Adjuster 4a, 7b Lower end part 5 Spring support 5a Main body part 5b Eave part 6 Spacer 7 Holder Member 7c Intermediate part 8 Snap ring 11 Rod body

Claims (4)

A fork body consisting of a vehicle body side tube and a wheel side tube has a suspension spring that urges the fork body in the extension direction, and has a damper at the axial center of the fork body, and is connected to the upper end of the body side tube. The adjuster has an adjuster at the shaft core portion of the cap member, and a spring receiver is brought into contact with the lower end of the adjuster. By rotating the adjuster, the upper end of the suspension spring is moved up and down via the spring receiver. In the spring force adjustment structure that enables adjustment of the spring force level,
A cap portion formed in a flange shape, a connecting portion formed in a cylindrical shape connected to the inner periphery of the upper end portion of the vehicle body side tube connected to the outer peripheral side end portion of the lid portion, has an inner peripheral end portion is provided continuously to the guide portion formed in a cylindrical shape which is mounted an adjuster rotatably possible and vertically movable, and a cylindrical space portion between the connecting portion and the guide portion,
The outer periphery of the lower end of the adjuster is screwed and connected to the inner periphery of the lower end of the guide portion, and the inner periphery of the upper end of the holder member is screwed and connected to the outer periphery of the lower end of the guide portion.
The holder member is screwed to the upper end portion of the rod body constituting the damper on the shaft core portion of the lower end portion, and an intermediate portion between the upper end portion and the lower end portion of the holder member is formed in a bifurcated shape so as to receive a spring on the inside. A spring force adjustment structure characterized in that the spring is housed so as to be movable up and down. The adjuster has a snap ring fitted to the outer periphery of the lower end portion, and the snap ring is brought into contact with the lower end of the guide portion of the cap member to prevent the adjuster from coming off from the guide portion. Spring force adjustment structure. A main body portion in which a spring support is formed in an annular shape and is housed in an intermediate portion of the holder member, and a spacer that protrudes outward from the intermediate portion of the holder member while being connected to an outer peripheral side end portion in the diameter direction of the main body portion The spring force adjusting structure according to claim 1, further comprising a pair of flanges that abut the upper ends of the springs. The seat adjacent to the back surface of the elastic body in the stopper that is disposed inside the upper end portion of the vehicle body side tube and allows the upper end of the wheel side tube to come into contact is formed between the lower end of the connecting portion of the cap member and the upper end portion of the holder member. The spring force adjusting structure according to claim 1, wherein the spring force adjusting structure is sandwiched between the step portions.

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