TWI728242B - Front fork - Google Patents

Abstract

The present invention is provided with a damper (D) having a hydraulic cylinder (5) and a piston rod (6) inserted into the hydraulic cylinder (5) so as to be movable in the axial direction and interposed between the outer tube (1) and the inner tube (2) Between; Suspension spring (S) is a coil spring formed by winding a wire, and the wire at one end of the axial direction is in close contact to form a cylindrical partition wall ( 7); and the buffer rubber (8), which can penetrate into the partition wall (7), when the buffer rubber (8) penetrates into the partition wall (7), it is formed between the partition wall (7) and the buffer rubber (8) The restriction channel (70) that resists the flow of the fluid moving from the inside of the partition wall (7) to the outside, and when the cushion rubber (8) further penetrates into the partition wall (7), the cushion rubber (8) is compressed.

Description

Front fork

The present invention relates to the improvement of the front fork.

In the past, front forks used in straddle-type vehicles, such as those disclosed in JPH08-303518A, are equipped with: an outer tube; an inner tube that is movably inserted into the outer tube; dampers and suspension springs, It is interposed between the outer tube and the inner tube; the oil lock box is installed in the state of being immersed in oil; and the oil lock plate penetrates into the oil lock box when the stroke amount to the retracted side of the front fork increases .

In such a front fork, a suspension spring is used to elastically support the car body. In addition, the suspension spring expands and contracts when vibration is input to the front wheels from the road surface when the vehicle is traveling, thereby suppressing the transmission of vibration to the vehicle body. In addition, when the suspension spring expands and contracts, it exerts elastic force to vibrate the vehicle body, but the damper exerts a damping force to quickly calm the vibration.

In addition, in the aforementioned front fork, when the stroke amount to the retracted side of the front fork increases, the oil lock piece penetrates into the oil lock box. As a result, the oil in the oil lock tank is pressurized by the oil lock plate, and the pressure in the oil lock tank rises, generating a large damping force that hinders the contraction of the front fork (hereinafter referred to as "damping force generated by the oil lock mechanism"). "). Therefore, the stroke speed to the retracted side of the front fork can be decelerated, and the shock at the most retracted time can be alleviated.

The damping force generated by the oil lock mechanism has a characteristic that depends on the stroke speed. When the stroke speed increases, it becomes larger, and conversely, when the stroke speed decreases, it becomes smaller.

Therefore, when the front fork is contracted and the oil lock piece enters the oil lock tank at a certain speed, the damping force generated by the oil lock mechanism temporarily increases. However, as the stroke speed decreases when the front fork continues to retract, the damping force generated by the oil lock mechanism decreases. This situation is shown in Figure 5. Fig. 5 is a graph showing the characteristics of the damping force generated by the oil lock mechanism. The elapsed time during which the front fork continues to retract is the horizontal axis, and the damping force generated by the oil lock mechanism is the vertical axis as the load.

In the conventional front fork with such an oil lock mechanism with damping force characteristics, the damping force generated by the oil lock mechanism near the most retracted time of the front fork is reduced, and it is brought to the ride when the front fork is most retracted. The burden of the readers disappears and the doubts of the sense of violation. That being said, in an oil lock mechanism with speed-dependent damping force characteristics, it is not easy to increase the damping force in the low-speed range.

In addition, in the front fork disclosed in JPH08-303518A, the oil lock box is provided on the rod guide that axially supports the piston rod, and the structure of the rod guide becomes complicated and expensive. In addition, the oil lock plate is generally formed of aluminum or the like, which is expensive. Therefore, the conventional front fork is more expensive.

Therefore, the object of the present invention is to provide a front fork that solves such a problem, can prevent a situation where a passenger is dissatisfied as the load disappears when the front fork is most retracted, and can reduce the cost.

The front fork that solves the aforementioned problems is equipped with a suspension spring, which is a coil spring formed by winding a wire, and the wire at one end in the axial direction is closely contacted to form a cylindrical shape before the stroke amount to the retracted side of the front fork becomes the maximum. The partition wall; and the cushion rubber, which can penetrate into the aforementioned partition wall. Moreover, when the buffer rubber intrudes into the partition wall, a restriction channel is formed between the partition wall and the buffer rubber to resist the flow of the fluid moving outside in the partition wall. After the restriction channel is formed, the restriction channel is formed. When the cushion rubber further penetrates into the partition wall, the cushion rubber is compressed.

Hereinafter, the front fork according to the embodiment of the present invention will be described with reference to the drawings. The same symbols attached by several figures indicate the same parts. In addition, unless otherwise specified, the "up" and "down" of the front fork in the state where the front fork is installed on the vehicle are referred to as the "up" and "down" of the front fork.

The front fork F according to an embodiment of the present invention shown in FIG. 1 is a suspension device that suspends the front wheels from a straddle-type vehicle such as a two-wheeled vehicle or a three-wheeled vehicle. The front fork F includes a tube member T having a sleeve type composed of an outer tube 1 and an inner tube 2; a damper D housed in the tube member T; and a suspension spring S.

The pipe member T is an inverted type in this embodiment. First, the outer tube 1 is a vehicle body side tube and is arranged on the upper side of the inner tube 2, and the inner tube 2 is an axle side tube and is arranged on the lower side of the outer tube 1.

The outer tube 1 is connected to the vehicle body via an axle-side bracket (not shown), and the inner tube 2 is connected to the axle of the front wheel via the axle-side bracket 3. The bearings 10 and 20 are arranged between the repeated parts of the outer tube 1 and the inner tube 2, and the inner tube 2 can be smoothly folded in the outer tube 1. Furthermore, when the front wheel vibrates up and down when the vehicle is traveling on an uneven road surface or the like, the inner tube 2 moves in and out of the outer tube 1 and the front fork F expands and contracts.

In addition, a steering rod (not shown) is fixed to the axle-side bracket. The steering rod is rotatably inserted into the head pipe of the vehicle body frame that becomes the backbone of the vehicle body, and is rotated by the operation of the handle. Furthermore, when the steering rod is rotated, the front fork F rotates around the steering rod while supporting the front wheels, and therefore the direction of the front wheels is changed by the operation of the handle.

The upper opening of the outer tube 1 is closed with a cover 4. In addition, the lower end opening of the inner tube 2 is closed with a bracket 3 on the axle side. In addition, the overlap between the outer tube 1 and the inner tube 2 is closed by a sealing member 11 such as an oil seal and a dust seal. In this way, in the front fork F according to the present embodiment, the inner and outer sides of the pipe member T are divided to seal the liquid and gas in the pipe member T, and prevent these from leaking out of the pipe member T.

Next, the damper D installed in the pipe member T is a hydraulic damper, and has: a hydraulic cylinder 5; a piston rod 6, which is inserted into the hydraulic cylinder 5 so as to be movable in the axial direction, and one end protrudes out of the hydraulic cylinder 5 The rod guide 50 is provided at one end of the hydraulic cylinder 5 to axially support the piston rod 6 freely in the axial direction; a damping force generating element (not shown) is provided in the hydraulic cylinder 5 for the hydraulic cylinder 5 and The flow of liquid generated when the piston rod 6 relatively moves in the axial direction exerts resistance.

In this embodiment, the damper D is a vertical type, and the piston rod 6 is arranged on the vehicle body side (upper side), and the hydraulic cylinder 5 is arranged on the axle side (lower side). In addition, the upper end portion of the piston rod 6 protruding upward from the hydraulic cylinder 5 is connected to the outer tube 1 via the cover 4. On the other hand, the hydraulic cylinder 5 is provided inside the inner tube 2 and is connected to the inner tube 2 via the axle-side bracket 3.

In this way, the damper D is interposed between the outer tube 1 and the inner tube 2, and when the front fork F expands and contracts, the piston rod 6 moves in and out of the hydraulic cylinder 5 and the damper D expands and contracts. Furthermore, when the damper D expands and contracts, the resistance of the damping force generating element exerts a damping force that hinders the expansion and contraction of the front fork F.

On the outer side of the damper D, that is, the inner side of the pipe member T, a reservoir R is formed. Liquid such as operating oil is stored in the liquid chamber R, and gas is enclosed above the liquid surface to form a gas chamber G. In this embodiment, the reservoir R is connected to the hydraulic cylinder 5. When the damper D expands and contracts, the volume of the liquid that enters and exits the piston rod 6 of the hydraulic cylinder 5 moves between the hydraulic cylinder 5 and the reservoir R. . Thereby, the change in the internal volume of the hydraulic cylinder in which the piston rod protrudes and retracts and the change in the volume of the liquid caused by the temperature change can be compensated by the reservoir R.

However, the structure of the damper D can be changed as appropriate. For example, it is also possible to provide an expandable and contractible air chamber in the hydraulic cylinder, and the volume change of the fluid caused by the change in the internal volume of the hydraulic cylinder by the amount of the piston rod protruding and retracting and the temperature change are compensated by the air chamber. In addition, in the present embodiment, the damper D is of a single rod type, and the piston rod 6 extends to one side of the piston (not shown). However, the damper may be of a double rod type and the piston rod may extend to both sides of the piston.

Next, the suspension spring S installed in the pipe member T together with the damper D is a compression coil spring formed by winding a wire, and exerts an elastic force equivalent to the amount of compression. In addition, the suspension spring S is provided on the outer circumference of the piston rod 6 protruding upward from the hydraulic cylinder 5. The upper end of the suspension spring S is supported by the outer tube 1 on the vehicle body side via the cover 4, and the lower end of the suspension spring S It is supported by the hydraulic cylinder 5 via the rod guide 50. In this way, the suspension spring S is interposed between the pipe member T and the hydraulic cylinder 5.

Furthermore, when the front fork F contracts and the hydraulic cylinder 5 enters the outer tube 1, the compression amount of the suspension spring S increases and the elastic force of the suspension spring S increases. The elastic force of the suspension spring S separates the outer tube 1 and the inner tube 2 and acts in a direction in which the front fork F is extended. In the front fork F, the vehicle body is elastically supported by the suspension spring S.

In this embodiment, the suspension spring S has a portion with a larger pitch and a smaller portion, and the portion with a smaller pitch is provided at least at one end of the suspension spring S in the axial direction. Hereinafter, the part with a small pitch provided at one end of the suspension spring S in the axial direction is referred to as the small pitch part s1, and the other part is referred to as the suspension spring body s2.

When the front fork F is retracted, it is set so that the wires of the small pitch portion s1 are in close contact with each other until the stroke amount to the retracted side becomes the largest and the front fork F becomes the most retracted state (Figure 2). The stroke amount to the retracted side of the front fork F refers to the distance between positions A and B when the front fork F travels in the retracted direction from the reference position (position A) to an arbitrary position (position B). It becomes the largest in the contracted state. For example, when the position of the piston rod 6 relative to the hydraulic cylinder 5 when the front fork F is in the most extended state is used as the reference position, the stroke amount to the contraction side of the front fork F is equal to the amount of movement of the piston rod 6 from the reference position (distance).

As shown in FIG. 2, in a state where the wires of the small pitch portion s1 are in close contact, the small pitch portion s1 becomes a cylindrical partition wall 7 to prevent liquid from moving between the wires of the small pitch portion s1. On the other hand, the pitch of at least part of the suspension spring main body s2 is set to be larger than the pitch of the small pitch portion s1, and is set so that even if the front fork F is in the most contracted state, the wire does not come into close contact.

In addition, in the present embodiment, the small-pitch portion s1 is provided at the end of the hydraulic cylinder 5 of the suspension spring S, and is arranged in a state of being immersed in the liquid in the pipe member T. Then, when the stroke amount to the contraction side of the front fork F is larger than the predetermined amount, as shown in FIG. 2, the cushion rubber 8 installed on the outer circumference of the piston rod 6 starts to intrude into the partition wall 7.

The cushion rubber 8 is a cylindrical member formed of rubber (elastic body), and is fixed by being press-fitted into the outer circumference of the piston rod 6. The collision part 80 is fixed to the outer circumference of the piston rod 6 and is directly above the cushion rubber 8, and the upper end of the cushion rubber 8 abuts against the collision part 80. The collision portion 80 prevents the cushion rubber 8 from shifting upward with respect to the piston rod 6.

The outer diameter of the cushion rubber 8 is smaller than the inner diameter of the partition wall 7 formed by the small pitch portion s1. In addition, as described above, when the stroke amount to the contraction side of the front fork F is larger than that of a predetermined value, the cushion rubber 8 penetrates into the partition wall 7. In this way, the restriction channel 70 is formed between the outer circumference of the cushion rubber 8 and the partition wall 7, and the restriction channel 70 provides resistance to the flow of liquid from the inner side to the outer side of the partition wall 7.

Therefore, when the front fork F is contracted and the cushion rubber 8 advances inward (downward) in the partition wall 7, the pressure in the partition wall 7 rises to generate a damping force that hinders the contraction operation of the front fork F. First, in this stroke region, since the damping force generated by the restriction passage 70 is added to the main damping force exerted by the damper D, the force that resists the compression of the entire front fork F increases. Therefore, the stroke speed (retraction speed) toward the contraction side of the front fork F can be decelerated, and the shock at the time of the most contraction can be alleviated.

The damping force generated by the restriction passage 70 has a characteristic that depends on the stroke speed, and becomes larger when the stroke speed increases, and conversely, becomes smaller when the stroke speed decreases. Therefore, when the cushion rubber 8 penetrates into the partition wall 7 formed by the contraction of the front fork F at a certain speed, the damping force generated by the restricting passage 70 increases. However, when the front fork F continues to contract and the stroke speed decreases, the damping force generated by the restricted passage 70 decreases. This situation is shown in Figure 4(a). Fig. 4(a) is a graph showing the characteristics of the damping force generated by the restriction passage 70. The elapsed time for continuous contraction of the front fork is set on the horizontal axis, and the damping force generated by the restriction passage 70 is set as the load. axis.

In addition, when the cushion rubber 8 penetrates into the partition wall 7 and the front fork F contracts further, as shown in FIG. 3, the lower end of the cushion rubber 8 abuts the rod guide 50, and the rod guide 50 and the collision portion 80 Compressed cushion rubber 8. In this way, the cushion rubber 8 exerts an elastic force equivalent to the amount of compression. The elastic force of the cushion rubber 8 causes the piston rod 6 to withdraw from the hydraulic cylinder 5 and acts in a direction to extend the front fork F.

The elastic force of the cushion rubber 8 has a characteristic that depends on the stroke position (the position of the piston rod 6 relative to the axial direction of the hydraulic cylinder 5), and the greater the stroke amount toward the compression side of the front fork F, the greater, when the front fork F When it is the most compressed state, it becomes the largest. This situation is shown in Figure 4(b). 4(b) is a graph showing the characteristics of the elastic force of the cushion rubber 8 with respect to the stroke amount. The stroke amount of the front fork F is taken as the horizontal axis, and the elastic force of the cushion rubber 8 is taken as the load as the vertical axis.

In this way, the cushion rubber 8 can exert elastic force without depending on the stroke speed. Therefore, even if the stroke speed decreases near the most contraction time of the front fork F and the damping force generated by the restricting passage 70 becomes small, the elastic force of the cushion rubber 8 can hinder the contraction action of the front fork F. First, even if the front fork F approaches the most contracted state and the contraction speed decelerates, the cushion rubber 8 activates a load that resists contraction to achieve rigidity. Therefore, when the front fork F is most retracted, it is possible to prevent the rider from giving a sense of discomfort that the load disappears, and to improve the riding quality of the vehicle.

In addition, when the hardness or shape or the like of the cushion rubber 8 is changed, the feeling when the front fork F is most contracted changes. Therefore, the adjustment can be done by changing the cushion rubber 8 to a cushion rubber having a different hardness or shape. In addition, since the change of the cushion rubber 8 is easy, the adjustment is also easy, and the riding quality of the vehicle can be improved.

Hereinafter, the function and effect of the front fork F according to an embodiment of the present invention will be described.

The front fork F according to this embodiment includes: a sleeve-type tube member T having an outer tube (body side tube) 1 and an inner tube (axle side tube) 2; a damper D having a hydraulic cylinder 5 and The piston rod 6 inserted into the hydraulic cylinder 5 to be movable in the axial direction is interposed between the outer tube 1 and the inner tube 2; the suspension spring S is a coil spring formed by winding a wire, and is interposed in the tube Between the member T and the hydraulic cylinder 5, the wire at one end in the axial direction is in close contact to form a cylindrical partition wall 7 before the stroke amount to the retracted side of the front fork F becomes the maximum; and the cushion rubber 8 is installed It is on the piston rod 6 and can penetrate into the partition wall 7. In addition, when the cushion rubber 8 penetrates into the partition wall 7, a restriction channel 70 that resists the flow of fluid moving from the inside of the partition wall 7 to the outside is formed between the partition wall 7 and the cushion rubber 8. In addition, after the restricting passage 70 is formed, when the buffer rubber 8 further penetrates into the partition wall 7, the buffer rubber 8 is compressed.

According to this structure, when the cushion rubber 8 starts to invade the partition wall 7, the damping force generated by the restricting passage 70 is added to the damping force exerted by the damper D, so that the force resisting the compression of the entire front fork F increases. , The contraction speed of the front fork F can be slowed down to alleviate the shock at the most contraction.

In addition, according to the above structure, even if the stroke speed of the front fork F decreases and the damping force generated by the restricting passage 70 becomes small, when the cushion rubber 8 penetrates into the partition wall 7 and then further shrinks the front fork F, the cushion rubber 8 functions to reduce the front fork F The fork F is biased in the direction of extension. Therefore, since the rigidity can be obtained when the front fork F is most retracted, the passenger can be prevented from giving a sense of discomfort as if the load is disappearing, so that the riding quality of the vehicle can be improved.

In addition, according to the above-mentioned structure, even if the partition wall 7 is formed to replace the conventional oil lock box, there will be no complication and increase in parts. The cushion rubber 8 can be formed at low cost compared with the conventional oil lock plate, so that the front fork can be reduced. The cost of F.

In addition, in the present embodiment, the cushion rubber 8 is constituted by one rubber member. Therefore, the number of parts of the front fork F can be reduced to lower the cost. However, the cushion rubber may be composed of two or more rubber materials different in hardness or shape. In this way, when two or more rubber parts different in hardness or shape are used in combination, finer adjustments can be made, so the ride quality of the vehicle can be improved.

In addition, in the present embodiment, the damper D is a vertical type, the piston rod 6 is connected to the outer tube (body side tube) 1, and the hydraulic cylinder 5 is connected to the inner tube (axle side tube) 2. In addition, the hydraulic cylinder 5 is installed in the inner tube (axle side tube) 2, and the cushion rubber 8 is installed on the outer periphery of the piston rod 6 protruding out of the hydraulic cylinder 5. In addition, the suspension spring S has the small pitch portion (one end portion) s1 toward the hydraulic cylinder 5 side and is interposed between the hydraulic cylinder 5 and the outer tube (body side tube) 1.

According to the above structure, as compared with the case where the cushion rubber 8 is mounted on the hydraulic cylinder 5, the cushion rubber 8 is easy to mount, and the front fork F can be easily constructed. However, the damper may be formed in an inverted type to connect the piston rod to the axle side tube and connect the hydraulic cylinder to the vehicle body side tube. In such a case, of course, it is better to arrange the partition wall 7 in the liquid in the pipe member T, then move the small pitch portion s1 of the suspension spring S to the side of the opposite hydraulic cylinder, and use a rod guide or the like to apply the cushion rubber Installed in hydraulic cylinder. Moreover, such a change may not be made through the structure of the cushion rubber 8.

In addition, in this embodiment, the pipe member T is an inverted type, the outer pipe 1 is a vehicle body side pipe, and the inner pipe 2 is an axle side pipe. However, the pipe member may be a vertical type, and the outer pipe may be an axle side pipe and the inner pipe may be a vehicle body side pipe. Such a change of the pipe member can be made without going through the structure of the cushion rubber 8, the style of the damper D, and the direction of the suspension spring S.

In addition, in the present embodiment, the small-pitch portion s1 is provided at one end of the suspension spring S, and the partition wall 7 is formed by the small-pitch portion s1. However, one end of the suspension spring S that can form the partition wall 7 may be set so that when the cushion rubber 8 penetrates, the wire material of this part is in close contact to form the partition wall 7, and it may not necessarily be a part with a small pitch.

In addition, the partition wall 7 only needs to be formed earlier than the cushion rubber 8 is compressed, and the time for forming the partition wall 7 may be appropriately changed. For example, the partition wall 7 may be formed in the 1G state where the load of the vehicle weight is applied to the front fork F, or the partition wall 7 may be formed in the riding 1G state where the load of one occupant is applied in the 1G state. In addition, one end of the suspension spring may be tightly wound in advance, and the partition wall 7 may be formed by the tightly wound portion. In these cases, since the cushion rubber 8 invades after the partition wall 7 is formed, the stroke length in which the damping force generated by the restriction passage 70 can be obtained can be lengthened. In addition, it is only necessary to form the spring characteristics of the suspension spring body s2 into the required spring characteristics of the suspension spring S, and the suspension spring S can be easily designed.

However, the buffer rubber 8 may be inserted into one end of the suspension spring S to form the partition wall 7 and then the buffer rubber 8 may be compressed. In addition, the stroke amount of the front fork F required for the cushion rubber 8 to penetrate into the partition wall 7 can be arbitrarily set by the axial length of the partition wall 7 and the position of the cushion rubber 8. In addition, the structure of the suspension spring body s2 can be appropriately changed in accordance with the required spring characteristics of the suspension spring S, and of course, the smaller and larger portions may be provided in the suspension spring body s2.

Above, although the preferred embodiments of the present invention are described in detail, as long as they do not deviate from the scope of the patent application, modifications, modifications and changes can still be made.

The present invention claims priority based on Japanese Patent Application No. 2017-085815 filed at the Japan Patent Office on April 25, 2017, and the entire content of the application is incorporated into this specification by reference.

1‧‧‧Outer pipe 2‧‧‧Inner pipe 3‧‧‧Axle side bracket 4‧‧‧Cap 5‧‧‧Hydraulic cylinder 6‧‧‧Piston rod 7‧‧‧Partition wall8‧‧‧Cushioning rubber 10 , 20‧‧‧Bearing 11‧‧‧Sealing member 50‧‧‧Rod guide 70‧‧‧Limiting passage 80‧‧‧Abutment part D‧‧‧Damper F‧‧‧Fork G‧‧‧Air chamber R ‧‧‧Liquid chamber S‧‧‧Suspended spring s1‧‧‧Small pitch part s2‧‧‧Suspended spring body T‧‧‧Pipe member

Fig. 1 is a longitudinal sectional view schematically showing a front fork according to an embodiment of the present invention.　　 Figure 2 is an enlarged longitudinal cross-sectional view specifically showing a part of the front fork of Figure 1 and showing a state when the cushion rubber starts to penetrate into the partition wall.　　 Figure 3 is an enlarged longitudinal sectional view showing a part of the front fork of Figure 1 and showing a state when the cushion rubber is compressed. Figure 4(a) is a graph showing the characteristics of the damping force generated by the restriction passage with respect to the contraction time of the front fork, and Figure 4(b) is a graph showing the elastic force of the rubber cushion relative to the stroke amount of the front fork Characteristic diagram.　　 Figure 5 is a diagram showing the characteristics of the damping force generated by the oil lock mechanism with respect to the contraction time of the conventional front fork.

1‧‧‧Outer tube

2‧‧‧Inner tube

5‧‧‧Hydraulic cylinder

6‧‧‧Piston rod

7‧‧‧The next wall

8‧‧‧Cushioning rubber

50‧‧‧Rod guide

70‧‧‧Restricted access

80‧‧‧Abutment Department

D‧‧‧Dampener

S‧‧‧Suspended Spring

s1‧‧‧Small pitch part

s2‧‧‧Suspended spring body

T‧‧‧Pipe member

Claims (3)

A front fork is provided with: 　　 sleeve type pipe member having a vehicle body side pipe and an axle side pipe; 　　 damper having a hydraulic cylinder and a piston rod inserted into the hydraulic cylinder so as to be movable in the axial direction, and interposed Between the vehicle body side tube and the axle side tube; 　　 suspension spring is a coil spring formed by winding a wire, and the wire is interposed between the pipe member and the hydraulic cylinder at one end in the axial direction , Before the stroke amount to the contraction side becomes the maximum, it is closely attached to form a cylindrical partition wall; and the cushion rubber is installed in the hydraulic cylinder or the piston rod and can penetrate into the partition wall. In the partition wall, a restriction channel is formed between the partition wall and the cushion rubber to resist the flow of the fluid moving outside in the partition wall. After the restriction channel is formed, the cushion rubber moves further into the partition wall. When intruding, the aforementioned cushion rubber is compressed. Such as the front fork of the first item in the scope of the patent application, in which 　　 the aforementioned cushion rubber is composed of two or more rubber parts with different hardness or shapes. For example, the front fork of the first item in the scope of the patent application, wherein 　　 the hydraulic cylinder is provided in the axle side tube, and 　　 the suspension spring is interposed between the hydraulic cylinder and the vehicle body with the one end toward the hydraulic cylinder side Between the side pipes, 　　 the cushion rubber is installed on the outer circumference of the piston rod.

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