JP2548839Y2 - Shock absorber - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber provided with a coil spring having a shock absorbing function and electric devices such as a load sensor.

[0002]

2. Description of the Related Art Conventionally, as this type of shock absorber, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 61-135810.

In such a shock absorber, a spring seat is attached to each of the outer peripheral portions of a cylinder and a piston rod constituting a hydraulic shock absorber, and a coil spring is mounted in a compressed state between the spring seats. A structure in which a piezoelectric element for detecting a load is attached to a part of a piston rod located inside the piston rod, and a lead wire of the piezoelectric element is drawn out through a through hole formed in a spring seat on the piston rod side. It has become.

The spring seat on the piston rod side includes a first component member having the through hole formed therein,
Although it is configured to be connected to a second component member that is in contact with the end of the coil spring, they are connected in advance via a bearing and cannot be separated as one unit. Installed.

Therefore, when assembling the shock absorber having such a configuration, first, a coil spring is mounted on a spring seat attached to a cylinder side, and then a lead wire of a piezoelectric element attached to a piston rod is connected to the piston rod. Pass through the through hole in the spring seat on the piston rod side before attaching to the rod. Thereafter, the coil spring is compressed by the spring sheet on the piston lot side through the lead wire of the piezoelectric element, and the spring sheet is attached to the piston rod by a nut.

[0006]

However, in the above-mentioned conventional shock absorber, when the spring seat on the piston rod side is mounted while compressing the coil spring, the spring seat is passed through the through hole of the spring seat. The lead wires of the piezoelectric element may be forcibly pulled to damage or break the lead wires, and the workability of assembly is poor. Further, for example, when the shock absorber is disassembled to remove the coil spring, it is necessary to pull out the wiring of the piezoelectric element from the through hole of the spring sheet on the piston rod side, and then remove the spring sheet. Sex was bad.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shock absorbing device which does not damage a lead wire of an electric device such as a load sensor during an assembling operation, and has good workability in assembling and disassembling.

[0008]

According to the shock absorbing device of the present invention, first and second spring supporting members are respectively attached to first and second connecting members which are connected so as to be close to and separated from each other. A coil spring is mounted in a compressed state between the first and second spring support members, and a lead wire of an electric device provided inside the coil spring extends through the first spring support member to the outside. In the shock absorber to be pulled out, the first spring supporting member includes a first component and a second component, and the first component is attached to the first connecting member. A locking portion that has a diameter smaller than the inner diameter of the coil spring and locks the lead wiring;
The second component is provided with a spring support portion for supporting the coil spring, and the first component is compressed by the support portion so that the coil spring abuts on the first component. It is characterized by being attached and fixed to the structure.

[0009]

According to the shock absorber of the present invention, the spring supporting member for supporting the coil spring is constituted by first and second components, and after the first component having a diameter smaller than the inner diameter of the coil spring is assembled. After locking the lead wiring of the electric device located inside the coil spring to the first component, the second component is compressed by the second component while the coil spring is compressed by the second component. When the coil spring is compressed and assembled, the lead wire of the electrical device is prevented from being forcibly pulled, preventing the wiring from being damaged or broken, and assembled. And the improvement of the workability of disassembly is realized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are views for explaining a first embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a hydraulic shock absorber.

In the hydraulic shock absorber 10, 1 is a cylinder, 2 is a piston, 3 is a piston rod (first connecting member), 4 is a reservoir tube constituting a cylinder body (second connecting member) 11, The oil in the upper and lower cylinder chambers R ₁ and R ₂ flows in and out through the communication passage L ₁ or L ₂ formed in the piston 2 in accordance with the vertical movement of the piston rod 3. A predetermined damping force is generated by the flow resistance. Between the cylinder 1 and the reservoir tube 4, the reservoir chamber R ₃ communicating with the gas is sealed and the lower side of the cylinder chamber R in ₂ is formed. Further, a cylinder chamber R ₁ is provided inside the piston rod 3.
And R is ₂ are bypass passage L ₃ is formed which communicates, the bypass passage L _3, by adjusting aperture by the rotation of the shutter 5 around the vertical axis, so that the damping force can be adjusted Has become.

The shutter 5 is connected to the lower end of a shaft 6 passing through the center of the piston rod 3, and the upper end of the shaft 6 is connected to the rotation axis of an actuator 7 located above the piston rod 3. . Therefore,
By controlling the rotation of the actuator 7, the damping force can be adjusted.

The piston rod 3 has a bumper rubber 2
After the cover 1 and the cover 22 are fitted, a load sensor (electric device) 23 is attached by a nut 24. Further, after the nut 25 is screwed, a plate 26 screwed to the cover 22 is fitted. . Furthermore, the piston rod 3 has
Upper spring seat (first spring support member) sandwiched between upper and lower rubber bushes 27 and 28
After the inner sheet 29 (first component) 29A of the 29 is fitted, the plate 30 is fitted and the nut 31 is screwed.

The lead wiring 32 of the load sensor 23 is drawn through a grommet 33 fitted on the outer periphery of the plate 26. In addition, all parts from the bumper rubber 21 to the nut 31, including the inner sheet 29A,
The diameter is smaller than a minimum inner diameter D of a coil spring 34 described later. At the outer peripheral portion of the annular inner sheet 29A, three bolts 35 are welded at equal intervals, and a notch portion (locking) for fitting a grommet 36 fitted to the wiring 32 is provided. Part) 37 is formed.

An annular outer sheet (second structure) 29B is attached to the upper surface of the outer peripheral portion of the inner sheet 29A by a nut 38 screwed to a bolt 35. An annular rubber bush 39 is attached to a lower surface portion (spring support portion) of the outer seat 29B, and the rubber bush 39 and a lower spring seat (second spring) fitted to the outer peripheral portion of the reservoir tube 4 are provided. The coil spring 34 is interposed between the upper surface (spring support) of the spring support 40).
Therefore, the inner sheet 29A and the outer sheet 29B are
By being joined, the upper spring seat 29
Will be constituted. Further, the outer sheet 29B is attached to the attachment member 42 of the shock absorber by bolts 41.

In FIG. 2, reference numeral 43 denotes a connector attached to the end of the wiring 32, and reference numeral 44 denotes a notch formed in the outer sheet 29B for passing the grommet 36. In FIG. 2, the illustration of the bumper rubber 21 is omitted.

Thus, the shock absorber constructed as described above performs a predetermined damping action of the impact force by cooperation of the hydraulic shock absorber 10 and the coil spring 34, and furthermore, the damping force is controlled by the rotation control of the actuator 7. Will be changed.

When assembling the shock absorber, the coil spring 34 is assembled according to the following procedure.

First, the piston rod 3 of the hydraulic shock absorber 10
The parts 21, 22, 23, 24, 25, 26, 27, 27 located between the bumper rubber 21 and the nut 31
Assemble 28, 29A, 30 and 31 and grommet 3
6 is fitted into the notch 37 of the inner sheet 29A. At this time, the outer sheet 29B is still attached to the inner sheet 29A.
Is not assembled.

Thereafter, the coil spring 34 is fitted, and the coil spring 34 is placed on the upper surface of the lower spring seat 40 fitted to the reservoir tube 4. At this time, the components located between the bumper rubber 21 and the nut 31 have their outer diameters smaller than the minimum inner diameter D of the coil spring 34, so that they smoothly enter the inside of the coil spring 34, The fitting of the coil spring 34 is not hindered.

Thereafter, the outer sheet 29B to which the rubber bush 39 is mounted is fitted, and the coil spring 34 is compressed via the rubber bush 39 while the bolt 35
The outer sheet 29B is attached to the inner sheet 29A. At that time, the grommet 36 is located at the notch 44 of the outer sheet 29B.

As described above, in the case of this embodiment, the grommet 3 is attached to the inner sheet 29A attached to the piston rod 3.
6, the wire 32 is locked, and the amount and position of the wire 32 withdrawn are determined.
When the coil spring 34 is compressed, the wiring 32
Is not pulled indefinitely, and the damage and disconnection of the wiring 32 are avoided.

The size of the inner sheet 29A may be smaller as long as its outer diameter is smaller than the inner diameter D of the coil spring 34, and may be smaller than that of the present embodiment. Further, as the hydraulic shock absorber 10, a hydraulic shock absorber having no damping force adjusting mechanism may be used.

FIG. 3 shows a second embodiment of the present invention.

In the case of this embodiment, the actuator 7 is
It is attached to the piston rod 3 so as to be located inside the coil spring 34. Therefore, in the present embodiment, damage and disconnection of the wiring 32 of the actuator 7 are avoided. In FIG. 3, reference numeral 51 denotes a rod connected to the piston rod 3, and a housing portion of the actuator 7 is provided with a coil spring 34 at a lower portion thereof.
Is formed to have a smaller diameter than the inner diameter. In FIG. 3, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 shows a third embodiment of the present invention.

In the case of this embodiment, the coil spring 34
An ultrasonic stroke sensor 61 is attached as an electric device located inside the device. The sensor 61 is supported by a support plate 62 attached to the piston rod 3 and has a reflecting plate 63 attached to the cylinder body 11 side of the hydraulic shock absorber 10 constituted by the reservoir tube 4 and the like.
The ultrasonic wave is emitted toward the, and the expansion and contraction stroke of the piston rod 3 is detected from the phase shift of the reflected wave. Therefore, in the present embodiment, the wiring 32 of the sensor 61 is
Damage and disconnection are avoided. The support plate 62 has a smaller diameter than the inner diameter D of the coil spring 34, and the hydraulic shock absorber 10 does not have a damping force adjusting mechanism. In FIG. 4, the same parts as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the first, second and third embodiments described above, the hydraulic shock absorber 10 is provided, and the piston rod 3 is used as the first connecting member to which the upper spring seat 29 is attached, and Although the cylinder body 11 constituted by the reservoir tube 4 and the like is used as the second connecting member to which the lower spring seat 40 is attached,
The first and second connecting members only need to be connected so as to be able to move toward and away from each other.
It is not limited to only the piston rod 3 and the cylinder main body 11.

[0031]

As described above, in the shock absorber of the present invention, the first and second components constitute the spring supporting member for supporting the coil spring, and the first and second spring members are smaller in diameter than the inner diameter of the coil spring. After assembling the structure, the lead wiring of the electric device located inside the coil spring is locked to the first structure, and then the coil spring is compressed by the second structure. Since the second component is attached to the first component,
When the coil spring is compressed and assembled, the drawn out wiring of the electric equipment is not forcibly pulled, preventing the wiring from being damaged or broken, and improving the workability of assembling and disassembling. Can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the shock absorber shown in FIG.

FIG. 3 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston 3 Piston rod (1st connection member) 4 Reservoir tube 10 Hydraulic shock absorber 11 Cylinder main body (2nd connection member) 23 Load sensor (electric equipment) 29 Upper spring seat (1st spring support member) 29A Inside sheet (first structure) 29B Outside sheet (second structure) 32 Lead-out wiring 34 Coil spring 37 Notch (locking part) 40 Lower spring seat (second spring support member)

Continuation of the front page (72) Inventor Mitsuo Sasaki 1370 Onna, Atsugi-shi, Kanagawa Inside Atsugi Unisia Co., Ltd. (56) References JP-A-56-34549 (JP, A) JP-A-61-135810 (JP, A) )

Claims (2)

(57) [Scope of request for utility model registration] A first and a second spring supporting member are attached to a first and a second connecting member which are connected so as to be able to move close to and away from each other, respectively,
Coil spring is compressed between spring support members
The buffer device is mounted in a state, and a lead wire of an electric device provided at an inner position of the coil spring is pulled out to the outside through the first spring support member. The first structure and the second
Made and a structure body, the first structure is attached to the first coupling member
A diameter smaller than the inner diameter of the coil spring;
A locking portion for locking the lead wiring is provided, and the second component supports the coil spring.
A spring support is provided, and the support
The coil spring is compressed to abut against the first component.
The shock absorber is attached and fixed to the first structure in a state where the shock absorber is laid. 2. The shock absorber according to claim 1, wherein the first and second connecting members are a piston rod and a cylinder body constituting a hydraulic shock absorber.