JP2001263401A - Hydraulic shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembly property of a bulkhead member to be fixed to a cylinder in a hydraulic shock absorber. SOLUTION: In the hydraulic shock absorber the bulkhead member 70A to demarcate a piston side oil chamber 48A from a reservoir 73 comprises a first bulkhead member 71 and a second bulkhead member 72 which are divided in the axial direction, the second bulkhead member 72 is formed of a material larger in elongation than the first bulkbead member 71, the first bulkhead member 71 is connected to the second bulkhead member 72 by a connection member 74, an outer periphery of the first bulkhead member 71 is fitted to an inner periphery of the cylinder 11 via a seal member (a seal portion 75A), and an outer periphery of the second bulkhead member 72 is caulked around and fixed to an inner periphery (a caulking portion 76) of the cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a hydraulic shock absorber.

[0002]

2. Description of the Related Art Conventionally, a hydraulic shock absorber has been used as a hydraulic shock absorber.
As described in the publication, a piston rod is inserted into a cylinder, a piston is fixed to an end of the piston rod, and a piston-side oil chamber in which the piston rod is not accommodated, and a rod-side oil in which the piston rod is accommodated. A damping force generator in an oil passage that connects the piston-side oil chamber and the rod-side oil chamber provided in the piston, and a reservoir chamber partitioned by the piston-side oil chamber and the partition member is provided. There is an oil passage provided with a damping force generating device in an oil passage that connects a piston side oil chamber and a reservoir chamber.

In this prior art, a cylinder member is swaged from the outer periphery and a partition member is fixed to the inner periphery.

[0004]

However, in the prior art, when the partition member is crimped and fixed to the cylinder, the partition member is easily damaged, and the assembling property is poor. That is, the partition member is
It forms the seat surface for the valve that composes the damping force generator provided in the oil passage. It requires hardness and it is difficult to use a material with a high elongation rate. When cracks are added, cracks are likely to occur.

An object of the present invention is to improve the assemblability of a partition member fixed to a cylinder in a hydraulic shock absorber.

[0006]

According to a first aspect of the present invention, a piston rod is inserted into a cylinder, a piston is fixed to an end of the piston rod, and a piston side oil in which the piston rod is not accommodated is formed inside the cylinder. Chamber and a rod-side oil chamber in which the piston rod is housed, and a damping force generator is provided in an oil passage connecting the piston-side oil chamber and the rod-side oil chamber provided in the piston. In a hydraulic shock absorber provided with a reservoir chamber partitioned by a member and a damping force generator in an oil passage connecting the piston side oil chamber and the reservoir chamber provided in the partition member, the partition member is divided in the axial direction. The first partition member and the second partition member, the second partition member is formed of a material having a higher elongation ratio than the first partition member, and the first partition member and the second partition member are connected. Connected by member The outer periphery of the first partition member is fitted to the inner periphery of the cylinder via a seal member, and the outer periphery of the second partition member is crimped and fixed to the inner periphery of the cylinder. An oil passage communicating between the piston-side oil chamber and the reservoir chamber is provided in each of the partition members, and a pressure-side damping force generator is provided in the oil passage of the first partition member.

According to a second aspect of the present invention, in the first aspect of the present invention, a piston side oil chamber and a reservoir chamber are communicated with a connecting member between the first partition member and the second partition member. A communication passage is provided, and a control rod fitted to the communication passage after the piston rod is compressed by a predetermined stroke is provided on the piston rod.

According to a third aspect of the present invention, in the first or second aspect of the present invention, further, a pressure side oil passage connecting the piston side oil chamber and the rod side oil chamber to the first partition member, respectively. And the extension side oil passage, and the compression side valve in the compression side oil passage,
The expansion side check valve is provided in the expansion side oil passage.

According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, the second partition member also functions as a valve stopper for an extension-side check valve.

[0010]

According to the first aspect of the present invention, the following effects are obtained. The first partition member and the second partition member are connected by a connecting member, and are installed inside the cylinder in a state where the second partition member is crimped and fixed to the cylinder. At this time, since the second partition member is made of a material having a high elongation (for example, a steel plate), it does not crack even if it receives a mechanical shock due to crimping. On the other hand, since the first partition member is not crimped, it is possible to employ a hard material (for example, a sintered metal) without fear of cracking, and to form a seat surface for a valve constituting the damping force generator.

When the first partition member needs to be made of a heavy material, the length of the first partition member in the axial direction can be reduced by allocating the fixed portion to the cylinder to the second partition member. Thus, the weight of the hydraulic shock absorber can be reduced.

The above is particularly effective when a sintered material is used as a constituent material of the first partition member. Since the sintering material has good moldability and is hard, it is suitable for use as a partition member having a plurality of oil passages and having a complicated shape, and a partition member which needs to form a hard seat surface for a valve.

According to the second aspect of the invention, the following operations are provided. When the control rod provided on the piston rod fits into the communication path between the connecting member of the first partition member and the second partition member, communication by the communication path between the piston side oil chamber and the reservoir chamber is interrupted, and the first The compression-side damping force generator provided on the partition member generates the damping force, and the damping force increases (position dependence of the compression-side damping force).

In the above, when the control rod is fitted into the communication passage of the connecting member, both the first partition member and the second partition member are supported at two points in the axial direction of the cylinder (the first partition member is Through the seal member, the second partition member is supported by the caulking fixed portion), and the smoothness and stability of the fitting of the control rod can be secured.

According to the third aspect of the invention, the following effects are obtained. The compression-side valve provided on the first partition member constitutes the compression-side damping force generator, and the extension-side valve constitutes the extension-side damping force generator.

According to the fourth aspect of the invention, the following effects are obtained. In the above description, since the second partition member also serves as a valve stopper for the extension valve, the number of parts can be reduced and the assembling property can be improved.

[0017]

FIG. 1 is a sectional view showing an extended state of a hydraulic shock absorber, FIG. 2 is a sectional view showing a compressed state of a hydraulic shock absorber,
3 is an enlarged sectional view showing a piston valve device and a base valve device, and FIG. 5 is an enlarged sectional view showing a damping force adjusting device.

The hydraulic shock absorber 10 has a hollow piston rod 12 inserted into a cylinder 11 as shown in FIGS.
A suspension spring 13 is provided outside the cylinder 11 and the piston rod 12.

The cylinder 11 has a vehicle-side mounting member 14, and the piston rod 12 has a wheel-side mounting member 15. A spring receiving adjustment jack 1 is provided on the outer periphery of the cylinder 11.
6 and a spring support 17 are screwed, and a spring support 19 is fixed to the piston rod 12 via a washer 18. A suspension spring 13 is interposed between the spring support 17 and the spring support 19 to adjust the spring support. The set length of the suspension spring 13 can be adjusted by the jack 16. The elastic force of the suspension spring 13 absorbs the impact force that the vehicle receives from the road surface.

As shown in FIGS. 1 to 3, the spring receiving adjustment jack 16 has a sleeve 21 fitted on the outer periphery of the cylinder 11, and is inserted into the sleeve 21 via an O-ring 22 to form a stopper ring. A housing 24 is supported in the axial direction by 23, and a plunger 25 is slidable through O-rings 25A and 25B in a jack chamber between the sleeve 21 and the housing 24. Are configured as a unit. At this time, the spring receiving adjustment jack 16 is provided with the manual pump 26 integrally with the housing 24 and the manual pump 2
6, the oil in the pump chamber 28 is pressurized by screwing operation, and the plunger 25 and the spring receiver 17 in the jack chamber connected to the pump chamber 28 are moved up and down, and thus the set length of the suspension spring 13 To adjust. Note that the spring receiving adjustment jack 16 connects the sleeve 21 to the cylinder 1.
1 is fixed to the stopper ring 21A on the outer periphery of the cylinder 1 and the mounting portion 24A provided on the housing 24 is fixed to the cylinder 1 with a set screw 24B.
By fixing it to 1, it is assembled to the cylinder 11.

The cylinder 11 has a rod guide 31 through which the piston rod 12 passes. The rod guide 31
As shown in FIGS. 1 and 2, the oil seal 33 is mounted on the cylinder 11 via an O-ring 32 in a liquid-tight manner.
The piston rod 12 is slidable in a liquid-tight manner at the inner diameter portion provided with the bush 34 and the dust seal 35. The cylinder 11 is provided with a bump stopper cap 36 outside the rod guide 31 so that the piston rod 12
The bump stopper cap 36 is brought into contact with the bump rubber 37 provided in the above-mentioned structure to regulate the maximum compression stroke. Further, the cylinder 11 includes a washer 38A and a rebound rubber 38 inside the rod guide 31.

The hydraulic shock absorber 10 has a piston valve device (compression-side and extension-side damping force generator) 40. The hydraulic shock absorber 10 suppresses the expansion and contraction vibration of the cylinder 11 and the piston rod 12 due to the absorption of the impact force by the suspension spring 13 by the damping force generated by the piston valve device 40.

The piston valve device 40 is shown in FIGS.
As shown in FIG. 4, a valve stopper 41 and a pressure-side valve 4 are provided at the end of the piston rod 12 inserted into the cylinder 11.
2, piston 43, extension side valve 44, valve stopper 4
5 are attached, and these are fixed with nuts 46.

The piston 43 is in liquid-tight sliding contact with the inside of the cylinder 11 via an O-ring 47A and a piston ring 47B provided on the outer peripheral portion, and the inside of the cylinder 11 is in contact with a piston-side oil chamber 48A in which the piston rod 12 is not accommodated. , And a rod-side oil chamber 48B in which the piston rod 12 is housed. The piston 43 includes a disc-shaped pressure-side valve 42.
(A damping valve) to provide communication between the piston side oil chamber 48A and the rod side oil chamber 48B, and a disc-shaped expansion valve 44 (a damping valve) to provide the piston side oil chamber 48A and the rod. And an extension-side oil passage 50 that enables communication with the side oil chamber 48B.

The piston 43 has an orifice 50A which bypasses the expansion valve 44, connects the piston oil chamber 48A to the expansion oil passage 50, and always connects the piston oil chamber 48A and the rod oil chamber 48B. .

The piston valve device 40 is shown in FIG.
It has a damping force adjusting device 51 shown in FIGS.

The damping force adjusting device 51 includes a piston rod 1
The piston-side oil chamber 48 is formed by the sleeve 51A pressed into
A and a bypass oil passage 52 that allows the rod-side oil chamber 48B to communicate with each other are formed. The bypass oil passage 52 is formed by a vertical hole 52A opening to the piston-side oil chamber 48A and a horizontal hole 52B opening to the rod-side oil chamber 48B. Make up. The damping force adjusting device 51 includes an adjusting rod 53 in the hollow portion of the piston rod 12.
A valve seat 52C which is inserted in a fluid-tight manner through the O-ring 54 so as to be able to advance and retreat in the axial direction, and the end face of the sleeve 51A is formed at the base end of the vertical hole 52A of the bypass oil passage 52 by the needle valve 53A at the tip. Adjust the opening area of. At this time, the adjusting rod 53 has a base end extending from the piston rod 12 to the mounting member 15 side, and has an abutting portion 55 on an end face of the base end. And the adjustment rod 53
The contact portion 55 is made to protrude in a direction to abut against an adjuster 61 described later by a thrust force based on the oil pressure of the piston side oil chamber 48A.

The adjuster 61 is provided on the mounting member 15 fixed to the outer end of the piston rod 12, and is supported by a mounting hole 62 formed in the vehicle width direction and intersecting the adjusting rod 53 in the axial direction. , The abutment portion 55 of the adjustment rod 45 is directly contacted, and the adjustment rod 53 is advanced and retracted in the axial direction.
The opening area of the valve seat 52C is adjusted so that the extension-side damping force can be adjusted. Specifically, the adjuster 61 is inserted from the screw hole 62A of the mounting hole 62, and the grooved operation portion 61B at the tip is pivotally supported in a liquid-tight manner through the O-ring 63 to the support hole 62B of the mounting hole 62, Insert the end screw part 61A into the mounting hole 6
2 is screwed into the screw hole 62A, and the intermediate tapered cam surface 6
1C is brought into contact with the contact portion 55 of the adjustment rod 53. Thereby, the adjuster 61 is moved to the grooved operation portion 61B.
The adjustment rod 53 is rotated and screwed by a rotary operation tool engaged in the groove of the above, and the adjustment rod 53 can be advanced and retracted in the axial direction by the displacement of the cam surface 61C. The screw hole 62 of the mounting hole 62
A is sealed by the plug 64.

At this time, the plug 64 is connected to the adjuster 61
When the valve seat 52C of the adjuster 61 is fully closed by the needle valve 53A of the adjustment rod 53, the screw is set at a position where the proximal end surface of the screw portion 61A abuts. Thereby, the adjuster 61 sets the fully closed position of the valve seat 52C that abuts on the plug 64 as the adjustment reference position,
The opening degree of the valve seat 52C can be adjusted by screwing in a return direction such as one rotation, two rotations, etc. from the reference position, and the adjustment can be facilitated.

The hydraulic shock absorber 10 has a base valve device (pressure-side damping force generator) 70. The base valve device 70 includes a cylinder 11 as shown in FIGS.
A partition member 70A is provided in the inside, and the reservoir chamber 7 partitioned from the piston side oil chamber 48A by the partition member 70A.
3 is provided, and a pressure side damping force generator (pressure side valve 79) is provided in an oil passage (pressure side oil passage 83) provided in the partition wall member 70A (first partition wall member 71).

In this embodiment, the partition member 70A of the base valve device 70 is composed of a first partition member 71 and a second partition member 72 divided in the axial direction as shown in FIG.
The second partition member 72 (for example, a steel plate or engineering plastic) is made of a material having a higher elongation than the first partition member 71 (for example, a sintered material such as a sintered metal). Then, the first partition member 71 and the second partition member 72
Are connected by a connecting member 74, and the outer periphery of the first partition wall member 71 is fitted in close contact with the inner periphery of the cylinder 11 via the base end seal portion 75A of the rubber bag-like ladder (diaphragm) 75, and the second The outer periphery of the partition wall member 72 is formed by a caulking portion 76 (for example, a punch caulking portion at six points in the circumferential direction or a ball caulking portion continuous in the circumferential direction) provided from outside the cylinder 11.
It is caulked and fixed to the inner circumference of. The prada 75 defines a gas chamber 73A with respect to the reservoir chamber 73.

The connecting member 74 has a hollow rod shape, and has a second partition wall member 72, a washer 77, a disk-shaped extension valve 78 (check valve) on one end flange portion 74A,
The first partition member 71, the disc-shaped pressure side valve 79 (damping valve), and the valve stopper 80 are mounted, and these are fixed by the nut 81. At this time, the second partition member 72
Also serves as a valve stopper for the extension side valve 78. The first partition wall member 71 includes an expansion-side valve 78 and an expansion-side oil passage 82 that enables communication between the piston-side oil chamber 48 </ b> A and the reservoir chamber 73, and includes a compression-side valve 79 and a piston-side oil chamber 48.
A and a pressure-side oil passage 83 that allows communication between the reservoir chamber 73 and A. Further, the second partition member 72 has an oil passage 84 that allows the piston-side oil chamber 48A to communicate with the reservoir chamber 73 via the extension-side oil passage 82 and the pressure-side oil passage 83 of the first partition member 71 described above. Prepare.

That is, in the base valve device 70,
A control rod 91 attached to the piston rod 12 as described below is connected to a communication passage 90 of the connecting member 74 described later.
Before the hydraulic shock absorber 10 is compressed,
The oil corresponding to the volume of the piston rod 12 entering the cylinder 11 is pushed out from the piston side chamber 48A into the reservoir chamber 73 via the communication passage 90 to compensate, and the piston rod 12 exiting the cylinder 11 when the hydraulic shock absorber 10 is extended is retracted. The volume of oil is returned from the reservoir chamber 73 to the piston side oil chamber 48A via the communication passage 90 to compensate. At a stage after the control rod 91 is fitted into the communication passage 90, the communication passage 90 is blocked by the control rod 91, so that when the hydraulic shock absorber 10 is compressed, the cylinder 11
Is compensated by being pushed out of the piston-side oil chamber 48A into the reservoir chamber 73 through the compression-side oil passage 83 having the compression-side valve 79 from the piston-side oil chamber 48A, and is compensated for when the hydraulic shock absorber 10 is extended. The oil corresponding to the exit volume of the piston rod 12 exiting from the reservoir chamber 73
Is returned to the piston-side oil chamber 48A via the expansion-side oil passage 82 having the expansion-side valve 78 to be compensated.

However, the hydraulic shock absorber 10 has the following configuration in order to provide the pressure-side damping force of the pressure-side valve 79 of the base valve device 70 with position dependency.

That is, as shown in FIG.
The connecting member 74 between the first and second partition members 72 is provided with a communication passage 90 for communicating the piston side oil chamber 48A and the reservoir chamber 73, and the control rod fitted to the communication passage 90 after compressing the piston rod 12 by a certain stroke. 91 was provided on the piston rod 12. At this time, an enlarged diameter portion 91A is formed at the base end portion of the control rod 91, and a tapered tapered portion 91B is formed at the distal end portion, and a nut for fixing the piston 43 is screwed to the distal end portion of the piston rod 12. The holding portion 46A holds the enlarged diameter portion 91A, and the control rod 91 is connected to the inner surface of the nut 46 and the enlarged diameter portion 91A.
A is supported movably in the radial direction by an O-ring 92 (elastic member) interposed therebetween. The O-ring 92 is fitted in a ring groove provided in the enlarged diameter portion 91A of the control rod 91. The control rod 91 has an enlarged diameter portion 91A.
Is supported so as to be movable in the radial direction, and the tapered portion 9 is tapered.
By providing 1B, it can be smoothly inserted into the communication passage 90 of the connecting member 74.

The control rod 91 has a hollow portion 93 opened to the base end side and communicating with the bypass oil passage 52 on the side of the piston rod 12.
The first portion which connects to the hollow portion 93 at two axial positions on the outer surface of
When the control rod 91 is fitted into the communication passage 90 (FIG. 4), the first hole 94A is provided with a minute gap between the control rod 91 and the communication passage 90. And the second hole 94B is set so as to communicate with the piston side oil chamber 48A. The bypass oil passage 52 provided in the piston rod 12 is provided with a first hole 94A of the control rod 91,
It communicates with the piston side oil chamber 48A via the second hole 94B.

Accordingly, the damping operation of the hydraulic shock absorber 10 is as follows. (At compression) (a) When the moving speed of the piston rod 12 is low, the oil in the piston side oil chamber 48A
From the hole 94A and the second hole 94B to the rod side oil chamber 48B via the bypass oil passage 52 of the piston rod 12,
During this time, the compression side damping force is obtained by the throttle resistance by the needle valve 53A. At the same time, the oil in the piston side oil chamber 48A passes through the orifice 50A of the piston 43,
8B, and the compression damping force is obtained by the throttle resistance by the orifice 50A during this time.

(B) When the moving speed of the piston rod 12 is medium to high, at the small stroke stage where the control rod 11 has not yet fitted in the communication passage 90 of the connecting member 74,
In addition to the damping force of (a), the oil in the piston-side oil chamber 48A moves to the rod-side oil chamber 48B through the pressure-side oil passage 49 of the piston 43, and obtains the compression-side damping force due to the bending deformation of the compression-side valve 42 during this time. .

(C) When the movement speed of the piston rod 12 is medium to high, at the large stroke stage when the control rod 91 is fitted into the communication passage 90 of the connecting member 74,
In addition to the damping force of (b), the oil in the piston side oil chamber 48A
Through the pressure side oil passage 83 of the partition member 71 of the reservoir chamber 73
The pressure side damping force is obtained by the bending deformation of the pressure side valve 79 during this time.

In the above (a) to (c), the cylinder 11
The amount of oil corresponding to the volume of the piston rod 12 that has entered the reservoir flows from the piston-side oil chamber 48A through the communication passage 90 of the connecting member 74 or the oil passages 83 and 84 of the first and second partition members 71 and 72. It is pushed out into the chamber 73 and compensated.

(At the time of extension) (a) When the moving speed of the piston rod 12 is low, oil in the rod side oil chamber 48B flows from the bypass oil passage 52 of the piston rod 12 to the holes 94A, 94B of the control rod 91.
The needle valve 53A moves to the piston-side oil chamber 48A via this, and the expansion-side damping force is obtained by the throttle resistance of the needle valve 53A during this time. At the same time, the oil in the rod-side oil chamber 48B moves to the piston-side oil chamber 48A through the orifice 50A of the piston 43, and the expansion-side damping force is obtained by the throttle resistance of the orifice 50A during this time.

(B) When the moving speed of the piston rod 12 is medium to high, in addition to the damping force of (a), the rod-side oil chamber 48
The oil B moves to the piston side oil chamber 48A through the expansion side oil passage 50 of the piston 43, and obtains the expansion side damping force due to the bending deformation of the expansion side valve 44 during this.

In the above (a) and (b), the cylinder 1
The first and second partition members 71, oil corresponding to the retreat volume of the piston rod 12 retreating from the reservoir chamber 73,
72 through the oil passage 82 (extension side check valve 78), 84 or the communication passage 90 of the connecting member 74.
Returned to A and compensated.

Therefore, according to the present embodiment, the following operations are provided. (1) The control rod 91 provided on the piton rod 12
Is fitted into the communication passage 90 of the connecting member 74 of the partition member 70A (the first partition member 71 and the second partition member 72), the communication by the communication passage 90 between the piston side oil chamber 48A and the reservoir chamber 73 is cut off. The pressure-side damping force generator (the pressure-side valve 7 of the base valve device 70) provided on the first partition member 71
9) generates a damping force, and the damping force increases (position dependence of the compression-side damping force).

(2) The control rod 91 is attached to the piston rod 12 via an elastic member (O-ring 92) so as to be movable in the radial direction. Thus, even if the concentricity of the communication path 90 between the control rod 91 and the partition member 70A is misaligned, the misalignment can be easily absorbed by the radial movement of the control rod 91. Therefore, stable operation can be achieved without requiring high machining accuracy and assembly accuracy, and the cost can be reduced.

(3) The nut 46 fixes the piston 43 (including the valves 42 and 44 and the valve stoppers 41 and 45) to the piston rod 12 and also holds the control rod 91. No holding member is necessary for 91, the configuration is simplified, and the assembling property is improved.

(4) The control rod 91 is mounted on the partition member 7
When the piston rod 12 is reversed in the extension stroke from the state in which the piston rod 12 is fitted in the communication passage 90 of 0A, and the control rod 91 moves in the direction of coming out of the communication passage 90, the negative pressure state that occurs in the reservoir chamber 73 is as follows. The oil in the piston side oil chamber 48A is quickly supplied to the reservoir chamber 73 from the minute gap between the control rod 91 and the communication passage 90 through the second hole 94B, the hollow portion 93, and the first hole 94A of the control rod 91. Will be resolved immediately. Therefore, the control rod 91 easily comes out of the communication passage 90, and the generation of a sound (abnormal sound) when the control rod 91 comes out is suppressed.

(5) Since the control rod 91 is provided on the piston rod 12, the bypass oil passage 52 is provided inside the piston rod 12, and the bypass oil passage 52 is provided.
The damping force adjusting device 51 having the adjusting rod 53 for adjusting the passage area can be easily equipped.

(6) The above-mentioned arrangement provided on the control rod 91
The first hole 94A and the second hole 94B of (4) are provided inside the piston rod 12 by the damping force adjusting device 5 of (5).
The first bypass oil passage 52 can also be used as a passage communicating with the piston side oil chamber 48A, and the configuration can be simplified.

(7) The first partition member 71 and the second partition member 72 are connected by a connecting member 74.
2 is fixed to the cylinder 11 by crimping.
Installed inside. At this time, since the second partition wall member 72 is made of a material having a high elongation (for example, a steel plate), the second partition wall member 72 does not crack even if it receives a mechanical shock due to crimping. On the other hand, since the first partition wall member 71 is not caulked, there is no fear of cracking, a hard material (for example, sintered metal) can be adopted, and the valves 78 and 79 constituting the damping force generator (base valve device 70) can be used. Sheet surface can be formed.

(8) When the first partition wall member 71 needs to be made of a heavy material, the portion fixed to the cylinder 11 is
By assigning the first partition member 72 to the first partition member 72, the axial length of the first partition member 71 can be reduced, and the hydraulic shock absorber 10 can be reduced in weight.

(9) The above (7) and (8) correspond to the first partition member 7.
This is particularly effective when a sintering material is used as the constituent material of (1). Since the sintering material has good formability and is hard, it is used for a partition member having a plurality of oil passages 82 and 83 and having a complicated shape, and a partition member which needs to form a hard seat surface for the valves 78 and 79. It is suitable.

(10) In the above (1), when the control rod 91 is fitted into the communication passage 90 of the connecting member 74, both the first partition member 71 and the second partition member 72 are in the axial direction of the cylinder 11. (The first partition member 71 is connected to the second partition member 7 via the sealing portion 75A of the ladder 75).
2 is supported by the caulking portion 76), and the smoothness and stability of the fitting of the control rod 91 can be ensured.

(11) The extension valve 44 provided on the piston 43
, The compression side damping force generator can be configured by the compression side valve 42.

(12) A compression side damping force generator is constituted by the compression side valve 79 provided on the first partition wall member 71,
The extension side valve can constitute an extension side damping force generator.

(13) In the above (12), since the second partition wall member 72 for the extension side check valve 78 also serves as a valve stopper for the extension side valve, the number of parts is reduced and the assemblability is improved. it can.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, the following modifications can be adopted.

(A) The elastic member for supporting the control rod to the piston rod so as to be movable in the radial direction is not limited to the O-ring, but may be a spring such as a coil spring or a leaf spring.

(B) When the control rod is fitted into the communication passage, the first hole communicating with the reservoir chamber may be provided through a minute gap between the control rod and the communication passage if it is through a minute passage. Not limited to The first hole may be an orifice or may be through a check valve that allows only oil flow from the piston side oil chamber side to the reservoir chamber side.

(C) The seal member used to fit the outer periphery of the first partition member obtained by dividing the partition member to the inner periphery of the cylinder is not limited to the base end seal member of the ladder, but may be an O-ring. In that case, the prada is changed to a free piston.

Incidentally, the reservoir chamber of the present invention is not limited to the one provided inside the cylinder as in the above embodiment, but the cylinder has a double-pipe structure composed of an outer pipe and an inner pipe. Alternatively, a reservoir tank communicating with the inside of the cylinder may be formed outside the cylinder, and the reservoir tank may be provided in the reservoir tank.

[0062]

As described above, according to the present invention, it is possible to improve the assemblability of the partition member fixed to the cylinder in the hydraulic shock absorber.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an extended state of a hydraulic shock absorber.

FIG. 2 is a sectional view showing a compressed state of the hydraulic shock absorber.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is an enlarged sectional view showing a piston valve device and a base valve device.

FIG. 5 is an enlarged sectional view showing a damping force adjusting device.

[Explanation of symbols]

 Reference Signs List 10 hydraulic shock absorber 11 cylinder 12 piston rod 42 compression side valve (damping force generation device) 43 piston 48A piston side oil chamber 48B rod side oil chamber 44 extension side valve (damping force generation device) 49 compression side oil passage 50 extension side oil passage 70A Partition member 71 First partition member 72 Second partition member 73 Reservoir chamber 74 Connecting member 75A Seal part (seal member) 76 Caulking part 78 Extension check valve 79 Compression valve (compression-side damping force generator) 82 Extension oil Road 83 Pressure side oil passage 90 Communication passage 91 Control rod

Claims (4)

[Claims] 1. A piston-side oil chamber in which a piston rod is inserted into a cylinder, a piston is fixed to an end of the piston rod, and a piston rod is not accommodated inside the cylinder,
Partitioned into a rod-side oil chamber in which the piston rod is housed,
A damping force generator is provided in an oil passage connecting the piston side oil chamber and the rod side oil chamber provided in the piston, a reservoir chamber partitioned by the piston side oil chamber and the partition member is provided, and the piston side oil provided in the partition member In a hydraulic shock absorber provided with a damping force generator in an oil passage connecting a chamber and a reservoir, a first partition member obtained by dividing the partition member in the axial direction and a second partition member are provided.
And the second partition member is made of a material having a higher elongation rate than the first partition member. The first partition member and the second partition member are connected by a connecting member, The outer periphery of the partition member is fitted to the inner periphery of the cylinder via a seal member, and the outer periphery of the second partition member is fixed by caulking to the inner periphery of the cylinder. A hydraulic shock absorber comprising: an oil passage communicating with a piston-side oil chamber and a reservoir chamber; and a pressure-side damping force generator provided in an oil passage of a first partition member. 2. A connecting member for connecting a piston side oil chamber and a reservoir chamber is provided in a connecting member between the first partition member and the second partition member. 2. The hydraulic shock absorber according to claim 1, wherein a control rod is provided on the piston rod. 3. A pressure side oil passage and a growth side oil passage connecting the piston side oil chamber and the rod side oil chamber are provided in the first partition member, respectively. 3. The hydraulic shock absorber according to claim 1, further comprising an extension-side check valve. 4. The hydraulic shock absorber according to claim 3, wherein the second partition member also functions as a valve stopper for the extension-side check valve.