JPH03200417A - Roll damper - Google Patents

Abstract

PURPOSE:To improve an effect for suppressing a roll of a vehicle by providing a control arm for converting vertical movement of wheel supporting members to rotary movement and transmitting to respective rods on a roll damper to be provided between inner ends of a pair of rods with the outer ends coupled to left and right wheel supporting members. CONSTITUTION:A pair of left and right rods (5A, 5B) extending a widthwise direction and a damping means 6 for damping axial direction vibration of both rods 5 are provided between left and right roar arms 3 constituting a part of a wheel supporting member on a vehicle suspension. The rods 5 are respectively coupled to the roar arms 3 via a motion transmitting member 7 which converts vertical movement of the roar arms 3 into axial direction movement of the rods 5 and a control arm 8 which converts vertical movement of the roar arms 3 into rotary movement of the rods 5. The damping means 6 is constituted wherein both left and right ends are freely slidably supported by the respective rods 5 as well as two pistons are fitted into a cylinder fixed to the body by a bracket which is not shown in the figure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll damper device used in an automobile suspension.

[Conventional technology]

Conventionally, as shown in Japanese Patent Publication No. 58-20805, a suspension system for a vehicle has conventionally installed a damper for suppressing the vertical vibration of each wheel, and connected the left and right wheel support members with a stabilizer. A device is known that uses a spring force to suppress roll during sharp turns. This conventional device uses the damper to relieve the movement of the stabilizer and suppress the shaking of the vehicle body when bumps and rebounds occur during normal driving conditions, and also uses the braking force of the damper to prevent rolls during sharp turns. It is designed to restrict the movement of the stabilizer and suppress the roll of the vehicle body, but since the damper's damping force does not act sufficiently during the roll, it takes time to dampen the vibration caused by the roll. There is a problem.

For this reason, as shown in Japanese Patent Application Laid-Open No. 63-265716, a control arm with torsional rigidity is disposed parallel to the stabilizer that suppresses roll during sharp turns, and a control arm with torsional rigidity is disposed between the control arm and the upper arm. A roll damper is disposed in the roll damper, and the vibration caused by the roll is damped by the roll damper.

[Problem to be solved by the invention]

As mentioned above, when a control arm is arranged parallel to the stabilizer and a roll damper is provided on this control arm, there is a problem in that a large space is required to install them. In other words, it is necessary to install the stabilizer whose side end is connected to the wheel support member and extends in the vehicle width direction, and the control arm whose side end is connected to the wheel support member and extends in the vehicle width direction so that they do not interfere with each other. Therefore, a large installation space was required.

The present invention has been made to solve the above problems, and can suppress vehicle roll during sharp turns without requiring a large installation space, and can also suppress vibrations caused by roll. It is an object of the present invention to provide a roll damper device capable of effectively damping.

[Means to solve the problem]

The present invention provides a pair of left and right rods extending in the vehicle width direction, a power transmission member that converts the vertical movement of a wheel support member into axial movement of the rod and transmits the same to each rod, and a power transmission member between the inner ends of the two rods. A roll damper device having a damping means disposed in the axial direction and damping the axial vibration of both rods when vibrations caused by the roll occur, the inner ends of the rods being connected to each other,
A control arm is provided which is slidable in the axial direction and connected to rotate together, and which converts the vertical movement of the wheel support member into rotational movement and transmits the same to each wood.

[For production]

According to the present invention having the above configuration, when a load that causes the vehicle to roll during a sharp turn is applied, the driving force corresponding to the load is converted into rotational force by the control arm and transmitted to the pair of left and right rods. Since the rods are twisted, the roll of the vehicle is suppressed by the torsional elasticity of both rods. In addition, when the left and right wheel support members move up and down in response to vibrations caused by roll during sharp turns, the driving force is converted into axial force by the power transmission member and transmitted to each rod. The vibrations are effectively damped by the damping means disposed between the inner ends of the wood.

〔Example〕

FIG. 1 shows a suspension system for a vehicle equipped with a roll damper device according to an embodiment of the present invention.

This suspension includes a wheel support member consisting of a small arm 2 that rotatably supports a wheel 1, and a lower arm 3 that supports the lower end of this knuckle arm 2. The knuckle arm 2 is connected to the vehicle body by a shock absorber 4 and a coil spring 5 installed on the upper outer periphery of the shock absorber 4.
The damping force of the shock absorber 4 damps vertical vibration of the vehicle body, and the spring force of the coil spring 5 suppresses vertical displacement of the vehicle body.

Disposed between the left and right lower arms 3 are a pair of left and right rods 5A, 5B extending in the vehicle width direction, and a damping means 6 for damping axial vibrations of both rods 5A, 5B. The rods 5A and 5B are comprised of a power transmission member 7 that converts the vertical movement of the lower arm 3 into axial movement of the rods 5A and 5B, and a control arm 8 that converts the vertical movement of the lower arm 3 into rotational movement of the rods 5A and 5B. are respectively connected to the lower arm 3 via.

The power transmission member 7 includes a shaft portion 7 extending in the longitudinal direction of the vehicle.
a, a first arm portion 7b extending outward from the distal end thereof, and a second arm portion 7C extending downward from the base end of the shaft portion 7a.
The outer end of the first arm part 7b is connected to the lower arm 3, and the lower end of the second arm part 7C is connected to the outer end of each rod 5A, 5B via a connecting rod 9. has been done. The shaft portion 7a is a bushing 10.
When the outer end portion of the first arm portion 7b swings up and down in accordance with the vertical movement of the lower arm 3, the shaft portion 7a rotates accordingly. At the same time, the lower end portion of the second arm portion 7C is oscillated in the vehicle width direction, and its driving force is transmitted to each rod 5A, 5B via the connecting rod 9.

The control arm 8 includes a first arm portion 8a extending in the vehicle width direction, and a second arm portion 8b extending in the longitudinal direction of the vehicle body from the inner end of the first arm portion 8a. The outer end of the portion 8a is connected to the lower arm 3, and the end of the second arm portion 8b is serrated connected to both the rods 5A, 5B. and,
When the lower arm 3 moves up and down, the first arm part 8a moves up and down.
It is configured so that rotational force is transmitted to the rods 5A, 5B by swinging about the connecting portion between the arm portion 8b and the rods 5A, 5B as a fulcrum.

As shown in FIG. 2, the damping means 6 has both left and right ends slidably supported by the respective rods 5A and 5B, and also includes a cylinder 11 fixed to the vehicle body by a bracket (not shown), and an inner portion of the cylinder 11. A partition wall plate 12 that divides the space left and right, a first piston 15 that is attached to one rod 5A and divides the left side space into a first cylinder chamber 13 and a second cylinder chamber 14, and the other rod 5B. It has a second piston 18 that is attached and partitions the space on the right side into a third cylinder chamber 16 and a fourth cylinder chamber 17. The piston 15.18 is formed with an orifice 19.20 through which fluid such as oil sealed in the cylinder 11 passes when the piston 15.18 moves.

The cylinder 11 is provided with a communication pipe 21 that communicates the first cylinder chamber 13 and the third cylinder chamber 16, and a communication pipe 22 that communicates the second cylinder chamber 14 with the fourth cylinder chamber 17. ing. In addition, the third
A gas is provided below the cylinder chamber 16 to absorb changes in the internal volume of the third cylinder chamber 16 when the vehicle bumps or rebounds and the rods 5A, 5B are displaced relative to each other in the axial direction, as will be described later. A chamber 23 is formed.

Furthermore, a connecting portion 24 having serration teeth formed on the circumferential surface is formed at the inner end of one of the rods 5A, and a serration groove 25 corresponding to the serration teeth is formed at the inner end of the other rod 5B. It is formed. In the above structure in which the tip of the connecting portion 24 is inserted into the serration groove 25, the rods 5A and 5B are connected so as to be able to slide freely in the axial direction and rotate together. When a load is applied that moves the left and right wheels 1 up and down in opposite directions and causes the lower arm 3 to swing up and down, and the vehicle attempts to roll, the driving force is converted into rotational force via the control arm 8. Each rod is 5A.

5B, and the rods 5A, 5B are twisted in opposite directions, so the roll is suppressed by the torsional elasticity of the rods 5A, 5B. That is, since the inner ends of the rods 5A and 5B are serrated and connected to rotate together, both rods 5A.

5B functions as the torsion bar of the stabilizer,
Roll during sharp turns is suppressed.

Further, due to the roll during a sudden turn, vibrations occur in which the lower arms 3 swing in opposite directions, and for example, the outer end of the lower arm 3 connected to one rod 5A swings upward, and When the outer end of the lower arm 3 connected to the other rod 5B swings downward, the swinging displacement of each lower arm 3 is transferred to both rods 5A via the power transmission member 7.
, 5B, one rod 5A slides toward the outside of the vehicle body, and the other rod 5B slides toward the inside of the vehicle body, as shown by arrow α in FIG. Then, depending on the sliding displacement of both rods 5A and 5B, the first. The second pistons 1518 each move to the left in FIG. As the internal pressure of the third cylinder chamber 13.16 increases, the fluid inside the third cylinder chamber 13.16 increases as shown by the arrow β.
They flow through orifices 19.20 of the pistons 15.18 into the second and fourth cylinder chambers 14.17, respectively.

Also, the swinging direction of the lower arm 3 is reversed, and both rods 5A
, 5B is slid in the direction opposite to the direction of the arrow α,
The fluid flow is reversed and the second. 4th cylinder chamber 14.17
The fluid in the first . Third
into the cylinder chambers 13 and 16 respectively. In this way, in response to the vertical vibration of the lower arm 3 caused by the roll, a fluid flow is generated passing through the orifice 19, 20, and the flow resistance suppresses the axial movement of both rods 5A and 5B, thereby suppressing the vibration. It will be attenuated.

Note that if the left and right wheels 1 move up and down in the same direction due to a bump or rebound acting on the vehicle, the lower arm 3
Since the control arm 8 and the control arm 8 swing in the same direction, the driving force is transmitted to the shock absorber 4 and the coil spring 5 without twisting the rods 5A and 5B, and the spring force of the coil spring 6 is used to drive the wheels. 1's vertical movement is suppressed.

Furthermore, when vibrations due to the bump or rebound occur, the left and right lower arms 3 are oscillated in the same direction, and the driving force is transmitted to each rod 5A, 5B by the power transmission member 7. 5A and 5B slide in opposite directions to generate relative movement. For example, each rod 5A.

When the outer ends of the pistons 15 and 5B are slid to protrude outward, the pistons 15 and 18 move to the first position.
．． As the volume of the fourth cylinder chamber 13.17 decreases, the volume of the second cylinder chamber 13.17 decreases. Although the volumes of the third cylinder chambers 14 and 16 will increase, the first cylinder chamber 13 and the third cylinder chamber 16 are communicated with each other through the communication pipe 21, and the second cylinder chamber 14 and the fourth cylinder chamber Since the chambers 17 are communicated with each other through the communication pipe 22, the internal pressures of the first and fourth cylinder chambers 13 and 17 do not increase. Therefore, the pistons 15, 18 smoothly slide and displace, the vibrations are transmitted to the shock absorber 4, and its damping force damps vibrations caused by bumps and the like.

Note that when both rods 5A and 5B are displaced relative to each other in the axial direction as described above, the insertion amount of the connecting portion 24 inserted into the serration groove 25 of the rod 5B changes, so the difference in diameter causes the above-mentioned The total internal volume of the first cylinder chamber 13 and the third cylinder chamber 16, which are communicated with each other by the communication pipe 21, changes. Since the change in internal volume is absorbed by the gas chamber 25, each cylinder chamber 13, 1
4.16.17 The internal pressure does not change due to vibrations caused by bumps, etc.

As described above, the damping means 6 disposed between the rods 5A and 5B damps vibrations caused by vertical movement of the left and right wheel support members in opposite directions due to the roll that acts when the vehicle makes a sharp turn. In the configured roll damper device, the inner ends of the rods 5A and 5B are connected to each other so that they can slide freely in the axial direction and rotate together, and the vertical movement of the wheel support member is converted into rotational movement. The above rod 5A.

5B is provided, and the torsional elasticity of the rods 5A, 5B is configured to suppress rolls during sharp turns. Therefore, the rods 5A, 5B function as rods of a roll damper device and as stabilizers. It also has the function of a torsion bar. Therefore, without requiring a large installation space, rolls during sharp turns can be suppressed with a simple configuration, and vibrations caused by the rolls can be attenuated at an early stage.

〔Effect of the invention〕

As explained above, the present invention is configured such that the rod of the roll damper device, which damps vibrations caused by rolls during sharp turns, is used as a torsion hole of the stabilizer, so that it can be installed easily in a limited installation space. , it is possible to install a roll damper device with a stabilizer function, which can reduce roll when the vehicle makes a sharp turn, and also has the effect of reducing vibrations caused by the left and right wheels moving up and down in opposite directions due to roll. can be attenuated. Therefore, there are advantages in that driving stability can be improved with a simple configuration and riding comfort can be maintained in a good condition.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a suspension equipped with a roll damper device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing essential parts of the roll damper device. 4...Lower arm (wheel support member), 5A, 5B...
Rod, 6... Damping means, 7... Power transmission member, 8
...Control arm, 24...Connecting portion (inner end), 25... Serration groove (inner end).

Claims (1)

[Claims] 1. A pair of left and right rods extending in the vehicle width direction, a power transmission member that converts the vertical movement of the wheel support member into axial movement of the rod and transmits it to each rod, and a power transmission member disposed between the inner ends of the rods. and a damping means for attenuating the axial vibration of both rods when vibrations caused by the roll occur, the inner ends of the rods being integrally slidable in the axial direction. A roll damper device comprising a control arm that is rotatably connected and that converts the vertical motion of a wheel support member into rotational motion and transmits the same to each rod.