JPS6322084Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a damping force adjustable shock absorber used as a suspension system for automobiles.

A shock absorber with adjustable damping force (hereinafter also referred to as an adjustable shock absorber) has a piston rod, and an actuator that operates a control rod for adjusting the damping force is installed in the suspension support provided at the top of this rod. ing. In this type of shock absorber, if water enters the suspension support (particularly the control rod), the actuator will malfunction. For this reason, seals are provided at the joints of the members forming the suspension support to prevent water from entering the actuator section. Therefore, the interior of the suspension support is a sealed space. On the other hand, the rubber mount of a suspension support expands and contracts upward and downward while the vehicle is running, changing the volume of the enclosed space and changing the air pressure inside. Also,
When the suspension support gets hot, the air in the closed space expands and becomes under high pressure. As described above, when the air pressure inside the suspension support changes, the cap that covers the upper part of the suspension support expands and contracts, making strange noises and causing discomfort to the occupants. Additionally, the cap expands and contracts, resulting in poor sealing. Furthermore, when the rubber mount is compressed by air pressure, its deflection decreases, making the ride of the vehicle less comfortable. If water gets into the suspension support, the fitting part between the actuator shaft and the control rod inside will rust, causing the control rod to rotate incorrectly and causing the damping force to reach the set value. It disappears.

In view of the above, the purpose of this invention is to provide a suspension support that can eliminate the increase in air pressure within the suspension support and, even if water gets inside, it can remove the water. be.

Next, this invention will be explained based on embodiments shown in the drawings.

In the figure, a piston rod 1 of an adjustable shock absorber for an automobile has a piston rod 1 at its lower end.
A piston (none of which is shown) that can slide upward and downward within the cylinder containing oil is attached. A knuckle arm (none of which is shown) to which a wheel is attached is attached to the lower part of the cylinder. An inner ring 2a of a radial ball bearing 2 filled with grease is fitted into the upper part of the piston rod 1. The inner cylinder 4 of the suspension support 3 is fitted onto the outside of the outer ring 2b of the radial ball bearing 2. The mount member 5 has an inner cylindrical part 6 and an outer cylindrical part 7, and both the cylindrical parts 6 and 7 are connected by a cushion rubber 8. The upper end 6a of the inner cylinder portion 6 of the mount member 5 is fixed to the upper outer peripheral surface of the inner cylinder 4 above the radial ball bearing 2. Further, the lower end portion of the outer tube 9 is fixed to the upper portion of the outer tube portion 7 of the mount member 5. The flange portion 9a at the upper end of the outer cylinder 9 is attached to the frame 21 of the vehicle body with an appropriate number of bolts 22 and nuts 23. The frame 21 is provided with a hole 21 a having a diameter substantially equal to the inner peripheral surface of the outer cylinder 9 above the outer cylinder 9 . In order to prevent water from entering the outer cylinder 9 through this hole 21a, the frame 2
1 and the outer cylinder 9 are sealed 15.
The actuator bracket 10 includes a cylindrical peripheral wall 10a located inside the inner cylinder 4, a bottom plate 10b provided at the lower end of the peripheral wall 10a, and the peripheral wall 10a.
It consists of an annular attachment part 10c formed in the outer circumferential direction at the upper end. The actuator bracket 10 is placed above the radial ball bearing 2 by fitting the piston rod 1 into a hole formed in the bottom plate 10b. The actuator bracket 10 is attached to the piston rod 1 by a nut 11 screwed into the upper end of the piston rod 1. The actuator 1 is attached to the mounting portion 10c of the actuator bracket 10.
2 is attached with an appropriate number of screws and nuts. This actuator 12 is, for example, a solenoid valve, and its shaft 12a is connected to the upper end of a control rod 13 provided through the axial center of the piston rod 1 by appropriate means (eg, a spline).

A cap 14 is provided above the outer cylinder 9 to cover the hole 21a of the frame 21. This cap 14 is attached to the frame 21 by an appropriate number of bolts 22 and nuts 23 for attaching the outer cylinder 9 to the frame 21.
is fixed. The portion where the cap 14 contacts the upper surface of the frame 21 is sealed 16.

This shock absorber generates a damping force by the action of an orifice provided in the piston when the piston rod 1 moves to the extension side or the contraction side in the cylinder, and also generates a damping force by the action of the orifice provided in the piston.
When the switch 2 in the vehicle compartment is operated, the control rod 13 is rotated to open and close an orifice provided separately from the orifice of the piston, thereby generating a damping force. Therefore, the damping force produced by the piston changes with the rotation of the control rod.

In the conventional adjustable suspension formed as described above, the space 17 formed by the suspension support 3 consisting of the inner tube 4, the mount member 5, and the outer tube 9 and the cap 14 is a sealed chamber. . In this embodiment, a small hole 19 is provided in the inner cylinder 4.
is open. This small hole 19 is bored in the inner cylinder 4 slightly above the upper end of the radial ball bearing 2 . Therefore, the space 17 is the small hole 1
9, it communicates with the outside air and is no longer in a sealed state.
Furthermore, since the actuator bracket 10 has a small hole 20 formed in the lower part of its peripheral wall 10a, the internal space 18 of this bracket 10 also communicates with the space 17 via the small hole 20.

In the above configuration, when the piston rod 1 moves to the extension side or the contraction side due to bounce or rebound while the vehicle is running, the mount member 5
As the cushion rubber 8 deforms, the volume of air within the space 17 of the suspension support 3 changes, and the pressure also changes. Furthermore, when the suspension support 3 becomes hot, the air within the space 17 expands, and the pressure within the space 17 increases.
In this way, space 1 of suspension support 3
Even if the air pressure inside the cylinder 7 changes or becomes high, the small hole 19 made in the inner cylinder 4 acts as a breathing hole, so the atmosphere can flow through the small hole 19 into the space 17.
The pressure inside the space 17 will not increase. Further, even if water enters the space 17, this water is discharged to the outside through the small holes 19, so that rust or the like does not occur in the radial ball bearing 2. Furthermore, even if water should enter the internal space 18 of the actuator bracket 10, the peripheral wall 10a of the bracket 10
Since there is a small hole 20 in the inner cylinder 4, the water flows out into the space 17 through the small hole 20, and further flows into the small hole 1 of the inner cylinder 4.
9 is discharged to the outside. Therefore, rust does not occur on the shaft 12a of the actuator 12 or the control rod 13, and the control rod 13
There will be no variation in the damping force of the adjustable shock absorber due to malfunction.

As mentioned above, this idea consists of a closed suspension support that has an inner cylinder, an outer cylinder, and a mount member that connects the inner and outer cylinders, and a cylinder that is attached at the bottom to the piston rod above the bearing within this support. By providing small holes in the inner cylinder of the damping force adjustable shock absorber and the actuator bracket having a cylindrical part,
Even if the air pressure inside the suspension support changes due to the expansion and contraction of the mount member due to the bounce and rebound of the vehicle while driving, or when the air pressure inside the suspension support increases due to an increase in the temperature of the suspension support part, the suspension Since the air inside the suspension support flows in and out to the outside through the small hole in the inner cylinder, the air pressure inside the suspension support does not change, which prevents abnormal noise from the suspension support and water leakage from the seal part of the support. Leakage etc. can be prevented. In addition, even if water gets into the actuator bracket or suspension support, this water will be discharged to the outside through the small hole in the actuator bracket and the small hole in the inner cylinder, so it will not leak into the actuator shaft or the controls. It is possible to eliminate malfunctions due to rust on the rod portion and to eliminate variations in the damping force of the suspension support.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of this invention, and is a cross-sectional view of a suspension support mounting portion of a shock absorber with adjustable damping force, and FIG. 2 is an enlarged view of section A in FIG. 1. 1... Piston rod, 2... Radial ball bearing, 3... Suspension support, 4
...Inner cylinder, 5...Mount member, 9...Outer cylinder, 1
0...actuator bracket, 10a...peripheral wall, 10b...bottom plate, 12...actuator,
12a...Axis, 13...Control rod, 1
7...Space, 18...Inner space, 19...Small hole,
20...small hole, 21...frame.

Claims (1)

[Scope of utility model registration request] An outer cylinder whose upper end is attached to the vehicle frame side, an inner cylinder whose lower end is fitted around the outer periphery of a bearing attached to the upper part of a piston rod into which a control rod is inserted into the shaft center, and the inner and outer cylinders. A closed type suspension support having a connecting mounting member, a cylindrical part having an actuator for actuating a control rod attached to the upper part and a cylindrical part having a bottom part attached to the piston rod at the upper part of the bearing, an actuator bracket provided in the cylinder of the actuator bracket; 1. A damping force adjustable shock absorber, characterized in that a small hole is provided in the portion to communicate the inside with the inside of the inner cylinder.