JPH0566354U - Bump stopper rubber for hydraulic shock absorber - Google Patents

Abstract

(57) [Abstract] [Purpose] Avoiding contact between the bump stopper rubber of the hydraulic shock absorber and the piston rod improves the riding comfort during compression. [Structure] The cover base 1 is on the lower surface of the mount base 7.
0 is held, the cover 11 is fixed to the lower surface of the central portion of the cover base 10, and the bump stopper rubber 13 is press-fitted and fixed in the cover 11. The inner diameter of the bump stopper rubber 13 is set to be larger than the outer diameter of the piston rod 2 even at the maximum compression.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bump stopper rubber for a hydraulic shock absorber used in a vehicle or the like.

[0002]

[Prior Art]

 As a conventional hydraulic shock absorber, as shown in FIG. 7, a mount base 105 is held at the upper end of a piston rod 102 inserted in a cylinder 101 via mount rubbers 103 and 104, and the mount base 105 is mounted on the vehicle body side. A cover base 109 having a cover 108 fixed thereto is held between the lower surface of the mount base 105 and a spring receiver 107 supporting an upper end portion of the suspension spring 106, and a bump stopper rubber 110 is provided inside the cover 108 to hold a bump stopper rubber 110. Some of them are held in a non-contact state with the outer peripheral surface.

[0003]

[Problems to be solved by the device]

 However, in the bump stopper rubber mounting structure of the hydraulic shock absorber as described above, the inner peripheral surface of the bump stopper rubber does not come into contact with the outer peripheral surface of the piston rod during normal compression, but when it reaches the most compressed state, as shown in FIG. As shown in, the inner surface of the bump stopper rubber 110 comes into contact with the outer surface of the piston rod 102.

As described above, when the bump stopper rubber and the piston rod come into contact with each other, not only the movement of the piston rod is restricted by the friction therebetween, but also when the friction becomes high, the damper body (cylinder) and the piston rod move. The rod and bump stopper rubber move at the same time and the damping force is no longer generated, and the input from the road surface is directly input to the vehicle body, resulting in poor riding comfort.

[0005]

[Means for Solving the Problems]

 In order to solve the above problem, the present invention sets the inner diameter of the bump stopper rubber to be larger than the outer diameter of the piston rod even in the most compressed state of the hydraulic shock absorber.

[0006]

[Action]

 Since the inner diameter of the bump stopper rubber is set to be larger than the outer diameter of the piston rod even when the hydraulic shock absorber is in the most compressed state, the inner surface of the bump stopper rubber does not contact the outer surface of the piston rod even in the most compressed state. , The riding comfort is improved.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a cross-sectional view of a main part of a hydraulic shock absorber according to a first embodiment of the present invention, FIG. FIG. 4 is a sectional view of an essential part of the third embodiment, FIG. 5 is a sectional view of an essential part of the third embodiment, and FIG. 6 is a sectional view of an essential part of the fifth embodiment. .

In the hydraulic shock absorber of the first embodiment, the retainers 3 and 4 are attached to the upper end portion of the piston rod 2 which is inserted into the damper body (cylinder) 1, and the mount rubber 5 is provided between the retainers 3 and 4. The mount base 7 is sandwiched between these mount rubbers 5 and 6, and the mount base 7 is fixed to the vehicle body with bolts 8.

A cover base 10 is held on the lower surface of the mount base 7, a cover 11 is fixed to the lower surface of the central portion of the cover base 10, and a dust cover 12 is hung at the lower end of the cover 11. A bump stopper rubber 13 is press-fitted and fixed in the cover 11. The inside diameter of the bump stopper rubber 13 is set to be larger than the outside diameter of the piston rod 2 even when the bump stopper rubber 13 is fully compressed.

Further, a protrusion 11a is formed in an inner diameter direction on an intermediate portion of the cover 11, while a protrusion 13a is formed on an outer diameter direction on an intermediate portion of the bump stopper rubber 13, and the bump stopper rubber is formed by the protrusion 11a of the cover 11. By receiving the protrusion 13a of the bump 13, the bump stopper rubber 13 is prevented from falling out of the cover 11. Further, a spring receiver 16 for receiving the upper end portion of the suspension spring 15 is in contact with the lower surface of the cover base 10.

With the above-described structure, the inner peripheral surface of the bump stopper rubber 13 does not normally contact the outer peripheral surface of the piston rod 2, and the bump stopper rubber 13 is not compressed even during the maximum compression as shown in FIG. Since the inner diameter of is set to be larger than the outer diameter of the piston rod 2, the inner peripheral surface of the bump stopper rubber 13 does not come into contact with the outer peripheral surface of the piston rod 2 and a damping force can always be generated to provide a comfortable ride. Become.

In the second embodiment shown in FIG. 3, a guide portion 11b is formed in the middle portion of the cover 11 so as to match the shape of the sloped portion 13b of the bump stopper rubber 13 to prevent the bump stopper rubber 13 from falling off. It was done.

In the third embodiment of FIG. 4, the central portion of the upper end of the cover 11 is hung downward to form an inner diameter regulating portion 18 that regulates the inner diameter of the bump stopper rubber 13, and the lower end of the inner diameter regulating portion 18 is located on the outer peripheral side. The bump stopper rubber 13 is folded to form a protrusion 19 that engages with the inner peripheral surface of the bump stopper rubber 13 to prevent the bump stopper rubber 13 from falling off. In this embodiment, the inner peripheral surface side of the upper end portion of the bump stopper rubber 13 which is most likely to contact the outer peripheral surface of the piston rod 2 at the time of maximum compression is regulated by the inner diameter restricting portion 18, so contact at the time of maximum compression can be reliably prevented.

In the fourth embodiment of FIG. 5, the lower end of the inner diameter restricting portion 18 is bent to the outer peripheral side to form a protrusion 11d that engages with the inner peripheral surface of the bump stopper rubber 13, thereby preventing the bump stopper rubber 13 from falling off. It was done. Further, in the fifth embodiment of FIG. 6, the inner diameter restricting portion 18 and the protrusion 19 are formed on the inner peripheral portion of the cover base 10.

[0015]

[Effect of the device]

 As described above, according to the present invention, the inner diameter of the bump stopper rubber is set to be larger than the outer diameter of the piston rod even when the hydraulic shock absorber is in the most compressed state. Since there is no contact with the outer peripheral surface of the rod, there is no friction between them and a normal damping force is generated, which improves riding comfort and steering stability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a first embodiment of a hydraulic shock absorber according to the present invention.

FIG. 2 is a cross-sectional view of the essential parts of the first embodiment in the most compressed state.

FIG. 3 is a sectional view of an essential part of the second embodiment.

FIG. 4 is a sectional view of an essential part of the third embodiment.

FIG. 5 is a sectional view of an essential part of the fourth embodiment.

FIG. 6 is a sectional view of the essential parts of the fifth embodiment.

FIG. 7 is a sectional view of a main part of a conventional hydraulic shock absorber.

FIG. 8 is a cross-sectional view of essential parts of the shock absorber in the most compressed state.

[Explanation of symbols]

1 ... Damper body, 2 ... Piston rod, 5,6 ... Mount rubber, 7 ... Mount base, 10 ... Cover base,
11 ... Cover, 13 ... Bump stopper rubber

Claims (1)

[Scope of utility model registration request] 1. A hydraulic shock absorber in which a bump stopper rubber is inserted into a cylinder on the end side of a piston rod in a non-contact state with the piston rod. A bump stopper rubber for hydraulic shock absorbers, which is set to be larger than the outer diameter of the piston rod.