JPS60159434A - Damping force adjusting system buffer - Google Patents

Abstract

PURPOSE:To protect a motor from the outside by disposing a damping force switching motor in a space outside a hollow piston rod in a damper mount base. CONSTITUTION:An inner cylinder 3 is secured fixedly to the interior of an outer cylinder 2 of a buffer 1 through a rod guide 4, and a hollow piston rod 5 is inserted into the inner cylinder 3 from above through a seal ring 6 to fix a piston 7. Also, a damper mount base 24 is fastened by bolts 25, and in an inner base 26 is housed a controller 30 comprising a damping force switching motor 29 for pivoting an adjusting rod 19, a reduction gear, etc. and elastically connected to the upper end of the rod 5 through a spring 31. Thus, the motor can be effectively protected from the outside to improve its durability while utilizing effectively a space.

Description

[Detailed description of the invention] The present invention relates to improvements in damping force adjustable shock absorbers.

Conventionally, various hydraulic shock absorbers have been proposed in which damping force is adjusted to improve ride comfort in accordance with the driving conditions of a vehicle.

However, most damping force adjustable shock absorbers are
As shown in No. 5-65741, the motor that rotates the adjustment rod and the gear train that transmits the rotation of this motor to the adjustment rod are disposed outside the cylinder of the shock absorber, which is disadvantageous in terms of space. Furthermore, after these are mounted on the vehicle body, mud, rainwater, etc. adhere to them while the vehicle is running, reducing their durability, and there are also problems in that noise generated when the motor is driven is transmitted into the vehicle interior.

Therefore, in order to solve these problems,
No. 047 has been proposed, in which a downwardly opening recess is formed in the lower part of the piston rod, and a motor for rotating the adjustment rod is housed in this recess.

However, such a structure has a major drawback in that the entire shock absorber must be disassembled in the event that the motor breaks down or the electrical wiring becomes disconnected.

The present invention has been made to solve the above problems, and its purpose is to sufficiently protect the damping force switching motor that rotates the damping force adjustment adjustment rod from the outside, and which is advantageous in terms of space. The purpose is to provide a damping force adjustable shock absorber with high maintainability.

In order to achieve this object, the present invention is characterized in that a damping force switching motor is disposed in a space outside the hollow piston rond within the damper mount base.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical cross-sectional view of a shock absorber according to the present invention, and FIG.
FIG. 3 is an enlarged view of the main part of the figure, and FIG. 3 is a sectional view taken along the line 3-3 in FIG.

An inner cylinder 3 is fixedly installed in the outer cylinder 2 of the shock absorber 1 via a front guide 4, and a hollow piston rod 5 is inserted from above into the inner cylinder 3 via a seal ring 6. A piston 7 is fixed to the lower end of the piston 7, which fits into the inner periphery of the inner cylinder 3 so as to be vertically slidable. In the shock absorber 1, oil chambers St, S2 and a reservoir chamber S3 are defined by the piston 7, the outer cylinder 2 and the inner cylinder 3, and each chamber 81, 82, 83 contains hydraulic oil. is included.

On the other hand, a damping force adjusting section 8 is provided above the piston 7, and in this damping force adjusting section 8, a cylindrical body 10 is attached to four parts 9 formed at the lower part of the hollow piston rod 5, as shown in FIG. The upper half 10a of this cylindrical body 10 faces into the recess 9 with a gap, and the piston 7 passes through the lower half 10b. Further, a stopper 11 is fitted into the upper part of the upper half part 10a, and a spring 13 is compressed between the disc valve 12 provided in the upper part and the stopper 11, and the elastic force of the spring 13 causes the disc valve 1 to move.
2 is being suppressed downward. Furthermore, three oil holes 14... are bored in the upper part of the upper half part 10a, and these oil holes 14...
As shown in FIG. 3 is provided so as to form a pair with each of the three oil holes 14..., and the size of each oil hole 14... is the same as that of the orifice 15-1.15-2.15-3. In addition, the upper half 10a of the cylindrical body 1o has a long hole 16.
An adjuster 17 having a shape formed therein is fitted onto the outside, and this adjuster 17 is tied to the lower end of an adjustment rod 19 inserted into the hollow portion 18 of the hollow piston rod 5.

During compression, part of the oil in the oil chamber s2 passes through the oil hole 20 of the piston 7, pushes up the disc valve 21 with its pressure, and flows into the oil chamber sl, and the other oil flows into the oil chamber s1. body 10
One of the orifices 15-1, 15-2 and 15-3 passes through the corresponding oil hole 14 to the oil chamber S.
1. Also, during extension, a part of the hydraulic oil in the oil chamber St passes through the oil hole 22 of the piston 7, pushes down the disc valve 23, and flows into the oil chamber S2, and the other oil flows into the oil chamber S2 through the orifice 15-1. It flows into the oil chamber S2 through any one of .15-2 and 15-3. Here, the adjuster 17 is rotated to open the orifices 15-1 and 15.
-2.15-34- The damping force is adjusted by opening either of the above.

On the other hand, a damper mount base 24 is fixed to the vehicle body side with bolts 25, and the upper end of the hollow piston rod 5 faces from below into the inner base 26 of the damper mount base 24. The hollow piston rod 5 is connected to the inner base 2 with a nut 27 screwed thereto.
It is tied to 6. A spring holding bolt 28 is screwed onto the upper part of the inner base 26, and a damping force switching motor 29 for rotating the adjustment rod 19 and a controller 30 including a speed reducer are housed inside the inner base 26. These are brought into elastic contact with the upper end of the hollow piston rod 5 by a spring 31.

The motor 29 is driven by a motor power source 32, and the motor power source 32 is turned on and off by signals from a comparator 33, and the comparator 33 receives signals from the angle setting device 34 and the controller 30. is input. That is, the predetermined orifice 15-L15-2.1 is set by the angle setting device 34.
5-3 is set to match the elongated hole 16 of the adjuster 17, the signal is input to the comparator 33. on the other hand,
The controller 30 detects the rotation angle of the adjusting condo 190 and inputs the signal to the comparator 33. When the respective input signals do not match, that is, when the rotation angle of the adjustment condo 190 set by the angle setting device 34 and the actual rotation angle do not match, a drive signal is output to the motor power supply 32, and the respective input signals are The motor 29 is driven until the input signals match. When the motor 29 stops, the predetermined orifices 15-1, 15-2, and 15-3 overlap the elongated holes 16, and the desired damping force is adjusted.

As explained above (according to the present invention, since the damping force switching motor is disposed in the space outside the hollow piston rond in the damper mount, the motor can be effectively protected from the outside and its durability can be increased). At the same time, space can be used effectively and the maintainability of the buffer can be improved.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a shock absorber according to the present invention, and FIG.
FIG. 3 is an enlarged view of the main part of the figure, and FIG. 3 is a sectional view taken along the line 3-3 in FIG. In the drawings, 1 is a hydraulic shock absorber, 2 is an outer cylinder, 3 is an inner cylinder, 5 is a hollow piston rod, 7 is a piston, 8 is a damping force adjustment part, 17 is an adjuster, 24 is a damper mount base, and 29 is a damping unit. Force switching motor, 30
3 is a controller, 32 is a motor power supply, 33 is a comparator, and 34 is an angle setting device. Patent Applicant Showa Seisakusho Co., Ltd. Agent Patent Attorney 2 1) Production Department Patent Attorney Kuni Ohashi Production Volume Patent Attorney Yu Koyama Figure 3-217-

Claims (2)

[Claims] (1) In a damping force adjustable shock absorber in which damping force is adjusted by rotating an adjusting rod inserted into a hollow piston rod by a damping force switching motor, the upper end of the hollow piston rod is connected to the vehicle body. A damping force adjustable shock absorber, characterized in that the damping force switching motor is disposed in a space outside the hollow piston rod within the damper mount base supported on the side. (2) A patented damping force adjustable shock absorber characterized in that the damping force switching motor is brought into elastic contact with the upper end of the hollow piston rod by a spring.