JPH02283511A - Rotary damper for automobile - Google Patents

Abstract

PURPOSE:To simplify the structure, improve strength and save space by storing a hollow shaft having a vane in a housing integrated with swinging arm having an axle insertion hole at its end, inserting a torsion bar in the holow shaft, thereby connecting the free end to an end plate closing the opening of the housing. CONSTITUTION:When a swinging arm is swung, a vane 12 moves relatively in an oil chamber S, and working oil between oil chambers S1, S2 moves while pushing wide a board valve through an oil path 24 or 26 of a valve unit 14 to generate attenuation force. Due to the swinging a torsion bar 10 is twisted so that suspension action is exhibited. It is thus possible to simple the structure, improve the strength of swinging arm and save space.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary damper used as a rear damper of an automobile, for example.

(Prior Art) As a rotary damper commonly used as a rear damper for automobiles, one disclosed in Japanese Utility Model Application Publication No. 58-90810 is known.

The structure of the rotary damper disclosed in the above publication includes a torsion bar inserted into the hollow rotating shaft of the rotary damper.
The free end of this torsion bar is screwed onto a swinging arm integrally provided with a hollow rotating shaft, or the rotating shaft of a rotary damper is arranged inside a hollow torsion tube, and a swinging arm is attached to the outer periphery of the torsion tube. I am trying to attach the proximal end of the.

(Problem to be Solved by the Invention) In the conventional structure described above, since the swing arm is directly connected to the torsion bar or torsion tube, the swing arm is connected to the torsion bar or torsion tube to move vertically and longitudinally. Bending force in the direction is likely to act.

In addition, the supporting area of the swinging arm, that is, the area where the rotating shaft and torsion tube are attached to the swinging arm, cannot be increased.
This complicates the reinforcement structure.

(Means for Solving the Problems) In order to solve the above problems, the present invention accommodates a hollow shaft in which a vane is formed in the housing of a rotary damper, inserts a torsion bar into the hollow shaft, and allows the torsion bar to freely move. the end is connected to an end plate that closes the opening of the housing;
Furthermore, a swinging arm having an axle insertion hole at its tip is integrally formed or coupled to the housing.

(Function) When the swing arm swings up and down as the car runs, the housing rotates relative to the vane, and hydraulic oil flows in and out between the oil chambers in the housing partitioned by the vanes, which causes damping. force is generated.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a plan sectional view of a suspension system for an automobile incorporating a rotary damper according to the present invention in the rear axle, FIG. 2 is a side view of the suspension system, and FIG. 3 is a longitudinal sectional view of the rotary damper.

In the suspension system, a bracket 3 is fixed to the vehicle body 1 with bolts 2, and a hollow shaft 4 of a rotary damper is attached to the bracket 3.
are attached at both ends. The hollow shaft 4 is housed in a housing 5, and as shown in FIG. By closing, an oil chamber S is formed within the housing 5. Here, the end plate 6.7 is rotatably supported by the hollow shaft 4 via a bearing 8.
7 and the housing 5 are integrated with bolts 9 as shown in FIG. 2, so that the housing 5 rotates with respect to the hollow shaft 4.

Further, a torsion bar 10 whose base end is connected to the vehicle body 1 side is pushed through the hollow shaft 4, and the free end of the torsion bar 10 protruding from the hollow shaft 4 is connected to a bracket 11 extending from one end plate 6 through serrations. and are fitted together.

Further, on the outer periphery of the hollow shaft 4, the oil chamber S is divided into two oil chambers Sl,
A vane 12 defined at S2 is provided, and a stop rubber 13 is attached to this vane 12, and a valve device 14 is detachably attached.

Further, a cylindrical recess is formed in the housing 5 behind the oil chamber S, and a free piston 15 is slidably provided in this recess, so that the oil connected to the gas chamber S3 in the temperature compensation chamber and the oil chamber S is formed. A chamber S4 is defined, and a valve mechanism 16 is provided in the oil chamber S4.
has been set up.

Further, a swing arm 17 integrally extends rearward from the housing 5. This swinging arm 17 is integrally formed with the housing 5 by hot forging, but only the swinging arm 17 is individually molded, and later the housing 5
The shape of the swinging arm 17 is such that it curves toward the center in the vehicle width direction from the rear end boss portion 19 in which the axle insertion hole 18 is formed toward the housing 5, and is attached to the tire 20 by welding or bolting. Avoid interference, and also move the swing arm 1.
A reinforcing rib 21 is formed at 7 so that the axis of the axle insertion hole 18 and the glaze of the torsion bar 10 are parallel to each other.

Incidentally, the surface of the hollow shaft 4 and the surface of the vane 12 are entirely covered with a sealing material 22, and the valve device 14, which is detachably attached to the vane 12, is connected to the vane 12 by a nut 22 and a flange 23 formed on the main body of the vane 12. The stepped portion of the opening is held between the openings.

The operation of the suspension system having the above structure will be explained below.

First, when the swing arm 17 swings in the direction of arrow A from the state shown in FIG. 3, the vane 12 moves relatively upward within the oil chamber S.
The hydraulic oil in the oil chamber S1 passes through the oil passage 24 of the valve device 14, expands the plate valve 25, and flows into the oil chamber S2, generating a damping force. Conversely, when the hydraulic oil swings in the direction of arrow B, the oil in the oil chamber S2 expands. The hydraulic oil passes through the oil passage 26, expands the plate valve 27, flows into the oil chamber S1, and generates a damping force. Then, as the swing arm 17 swings in the A direction or the B direction, the torsion bar 10 is twisted, and this twist exerts a suspension action. Incidentally, in addition to the torsion bar 10, a coil spring may also be used as a suspension spring.

(Effects of the Invention) As explained above, according to the present invention, the rotary damper is incorporated as a part of the automobile suspension system, which is advantageous because it does not take up as much space as when a cylindrical shock absorber is used. be.

In addition, since the swing arm is not attached to the end plate of the rotary damper housing, but is integrated into the housing itself, the mounting area can be increased, and therefore the force acting from the vertical and lateral directions can be increased. The swing arm can be made to have sufficient strength against.

In addition, the rotating shaft of the rotary damper is hollow, and the torsion bar is inserted into the rotating shaft, making the entire suspension system more compact. By making the torsion bar parallel to the axis, no vertical or longitudinal bending force is applied to the torsion bar, and by curving the swinging arm, there is no interference with the tire, so the tire housing can be moved to the side. It also prevents you from going out.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view of a suspension system for an automobile incorporating a rotary damper according to the present invention, FIG. 2 is a side view of the suspension system, and FIG. 3 is a longitudinal sectional view of the rotary damper. In addition, in the drawing, l is the vehicle body, 4 is the hollow shaft, 5 is the housing, and 6
．． 7 is an end plate, 10 is a torsion bar 12 is a vane, 17
18 is a swing arm, and 18 is an axle insertion hole.

Claims (3)

[Claims] (1) A hollow shaft with vanes formed on the outer periphery is housed in a housing, and the ends of the hollow shaft protruding from the end plates that close the left and right openings of the housing are connected to the vehicle body, and the base end is connected to the vehicle body. A torsion bar connected to the vehicle body side is inserted into the hollow shaft, a free end of the torsion bar protruding from the hollow shaft is connected to the end plate, and a swinging arm whose tip is connected to the wheel side is integrally attached to the housing. A rotary damper for an automobile characterized by an extension. (2) The rotary damper for an automobile according to claim 1, wherein the oil chamber formed in the housing has a non-cylindrical shape. (3) The swing arm is curved toward the center with respect to the width direction of the vehicle body from the tip where the wheel insertion hole is formed toward the housing in order to avoid interference with the tire. Rotary damper for automobiles.