JP2953728B2 - Roll damper device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll damper device.

(Prior art)

2. Description of the Related Art In general, a suspension device of a type in which left and right wheels of a vehicle are independently suspended is provided with a stabilizer bar for suppressing rolling to improve ride comfort and steering stability.

Normally, the stabilizer bar has a pair of arms extending forward or backward from a suspension arm supporting left and right wheels, and both ends are connected to ends of the arms, and a middle part is rotatably supported by the vehicle body. It is formed in a substantially U-shape from the torsion shaft and does not function as a spring at all when the left and right wheels move in the same phase up and down, but when moving in the opposite phase, the drag due to torsional elastic deformation of the torsion shaft With this, rolling is suppressed.

On the other hand, as the above suspension device, for example,
Japanese Patent Application Laid-Open No. 60-84312 describes a device provided with a coil spring in place of the stabilizer bar, and further provided with a roll damper device for attenuating the vertical movement of the left and right wheels to opposite phases. The roll damper device includes a bracket formed to protrude upward near a pivot portion of one suspension arm, a bracket formed to protrude downward near a pivot portion of the other suspension arm, and A roll damper supported in an inclined manner, a cylinder body of the roll damper is swingably connected to an end of one bracket, a piston rod is swingably connected to an end of the other bracket, and The coil spring is mounted on a roll damper, and both ends of the coil spring are connected to the cylinder body and the piston rod, respectively. When the left and right wheels move up and down in the same phase, the left and right brackets are inverted around the pivot portion of the suspension arm. Direction, the distance between the ends of the left and right brackets does not change, and the roll damper and coil spring Only moves in parallel, but when the left and right wheels move up and down in opposite phases, the ends of the left and right brackets change because the ends of the left and right brackets rotate in the same direction, respectively. The rolling is effectively suppressed by the damping force of the roll damper and the spring force of the coil spring.

[Problems to be solved by the invention]

In the vicinity of the suspension arm, since the strut of the suspension device and the coil spring and the like provided on the suspension device are disposed, there are severe restrictions on the arrangement space of the roll damper device. The roll damper device can be arranged by using the suspension arm which has a relatively large margin. However, since the roll damper is disposed in an inclined manner and the roll damper moves in parallel when the wheels move up and down in phase, a relatively large mounting space needs to be secured.

In addition, when the wheel moves up and down in the opposite phase, a load other than the axial direction is applied to the piston rod, so that the piston member mounted in the cylinder body may be unevenly worn or the piston member and the piston rod may be sealed. There is a problem that is reduced. An object of the present invention is to provide a roll damper device that can be disposed with good layout by effectively utilizing a space between left and right suspension arms.

[Means for solving the problem]

A roll damper device according to a first aspect of the present invention includes a cylinder body that is disposed in a vehicle width direction between left and right independently suspended wheels of a vehicle body and that is an integrated cylinder member; A partition wall provided therein, a pair of left and right cylinder chambers formed on both sides of the partition wall in the cylinder book, a pair of piston members respectively mounted in the pair of left and right cylinder chambers, and the piston A pair of left and right piston rods respectively connected to the members and extending outside the cylinder body, and formed on each piston member so as to communicate the rod-side liquid chamber and the head-side liquid chamber of the cylinder chamber partitioned by the piston members. And a pair of conversion means for converting the vertical movement of the left and right wheels into axial movement of the left and right piston rods and transmitting the same to the piston rods. The rod-side liquid chamber and the head-side liquid chamber of the left-side cylinder chamber communicate with the head-side liquid chamber and the rod-side liquid chamber of the right-side cylinder chamber, respectively, so that the working fluid in the liquid chamber flows through the orifice only when moving up and down. Communication path.

In a roll damper device according to a second aspect of the present invention, in the first aspect of the invention, the pair of left and right cylinder chambers is provided with a free piston for partitioning between a partition wall and a liquid chamber on the head side, and a pair of free pistons on the left and right sides thereof. A pair of left and right air chambers filled with pressurized air is formed between the piston and the partition wall.

[Action]

In the roll damper device according to the first aspect, when the left and right wheels independently suspended on the vehicle body move up and down, the up and down movement of the left and right wheels moves in the axial direction of the left and right piston rods via a pair of conversion means. The pair of left and right piston members mounted in the left and right cylinder chambers formed on both sides of the partition in the vehicle width direction central portion of the cylinder body are respectively driven to move via piston rods.

When the left and right wheels move up and down in phase, the left and right piston members are driven to move in opposite directions, and the working fluid in the rod-side liquid chamber and the head-side liquid chamber of the left and right cylinder chambers flows through the communication passage. Accordingly, no damping force for suppressing the movement of the piston member is generated. When the left and right wheels move up and down in opposite phases, the piston member is driven to move in the same direction, so that the working fluid flows through the orifice formed in the piston member, and the working fluid flows through the orifice. The movement of both piston members is suppressed by the damping action by the resistance, and the up and down movement of the left and right wheels to the opposite phase is damped.

As described above, since the cylinder body is disposed substantially horizontally in the vehicle width direction, the required space can be reduced as much as possible and the space between the suspension arms can be effectively utilized. In addition, since a load other than the axial direction hardly acts on the piston rod, uneven wear of the piston member and deterioration of the sealability of the piston rod and the piston member can be prevented.
And since a cylinder main body consists of an integral cylinder member, the structure of a cylinder main body is simplified.

In the roll damper device according to the second aspect, a partition partitioning left and right cylinder chambers is provided at a center portion of the cylinder body in the vehicle width direction, and partitions between the pair of left and right cylinder chamber niha partition partitions and the head-side liquid chamber. A pair of left and right air chambers filled with pressurized air are formed between the pair of left and right free pistons and the partition wall, and the hydraulic fluid in the cylinder body thermally expands. Sometimes, the thermal expansion of the working fluid can be absorbed by the volume contraction of the pressurized air in the pair of left and right air chambers.

〔The invention's effect〕

According to the roll damper device of the first aspect, the cylinder body is disposed substantially horizontally in the vehicle width direction as described in detail in the section of [Action], so that the required space is minimized. Therefore, the roll damper device can be disposed with good layout, even when the space between the suspension arms can be effectively utilized and there is little space margin near the suspension arm.

In addition, since a load other than the axial direction hardly acts on the piston rod, it is possible to prevent uneven wear of the piston member and deterioration of the sealability of the piston rod and the piston member. Further, since the roll damper device is configured to have a simple configuration including a pair of right and left conversion means, a cylinder body having a simple configuration including an integral cylinder member, and a piston member attached thereto, the roll damper device is configured. , And can be manufactured relatively inexpensively.

According to the roll damper device of the second aspect, when the hydraulic fluid in the cylinder body thermally expands, the thermal expansion of the hydraulic fluid can be absorbed by the volume contraction of the pressurized air in the pair of left and right air chambers. The effect is obtained.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In this embodiment, the present invention is applied to a double wishbone type automobile rear suspension device.

As shown in FIG. 1, a rear suspension device 1 for an automobile includes a cross member 2 serving as a vehicle body-side member for suspension provided at a rear portion of a vehicle body, and a lower portion on both left and right ends of the cross member 2. A pair of left and right lower arms 4 slidably supported via a shaft member 3, and a shaft member 5 oriented in the front-rear direction on upper left and right ends of the cross member 2.
A pair of left and right upper arms 6 slidably supported via a shaft, a connecting member 9 for connecting an inner arm of a wheel supporting member 8 to which a rear wheel is fixed and an outer end of the upper arm 6, A pair of left and right shock absorbers 10 interposed between the lower arm 4 and the upper arm 6, respectively;
The coil is basically composed of a coil spring 11 provided outside the vehicle, a stabilizer bar (not shown) for connecting the left and right lower arms 4 and a roll damper device 12, and the rolling caused by the left and right rear wheels moving up and down in opposite phases. Further, the spring force of the torsional elastic deformation of the stabilizer bar and the damping force of the roll damper device 12 are suppressed.

The roll damper device 12 is disposed in front of the cross member 2 in the vehicle width direction and extends substantially horizontally to the left and right sides.
A damper device main body 14 having a pair of piston rods 13 and a pair of left and right conversion mechanisms 15 for converting vertical movement of the left and right lower arms 4 into axial movements of the left and right piston rods 13 are provided.

As shown in FIG. 1, each of the conversion mechanisms 15 includes a swing arm 16 extending upward from the inner end of the lower arm 4 through the front side of the cross member 2, an upper end of the swing arm 16, and a piston rod 13. The connecting rod 17 is connected to the swing arm 16 and the piston rod 13 via a pin member 18 oriented in the front-rear direction. When the left and right rear wheels move up and down in the same phase, the left and right swing arms 16
And each is driven to move in the opposite direction via the connecting rod 17,
When they move up and down in opposite phases, they are each driven to move in the same direction.

The damper device body 14 will be described with reference to FIG.
As shown in FIG. 2, a substantially cylindrical cylinder body is provided on the front end face of the cross member 2 via a pair of left and right brackets 19.
20 are fixed in the vehicle width direction, rod guides 21 are fixed in both ends of the cylinder body 20 in a liquid-tight manner, and the inside of the cylinder body 20 is separated by a partition wall 22 fixed to a substantially central portion thereof.
A pair of free pistons 25 are mounted in the cylinder chambers 23 and 24 near the partition 22 so as to be air-tightly slidable, respectively. Air chambers 23A and 24A in which high-pressure air is sealed are respectively formed, and a cylinder chamber 23B outside the left and right free pistons 25 is formed.
A pair of left and right piston members 27 are slidably mounted inside 24B in a liquid-tight manner, and the inner ends of the left and right piston rods 13 are inserted through the rod guide 21 in a liquid-tight manner into the cylinder chambers 23B and 24B. And are connected to the left and right piston members 27, respectively. still,
The free piston 25 and the air chamber 26 are each a liquid chamber 28A / 28B /
This is for absorbing the thermal expansion of the hydraulic oil filled in 29A and 29B.

The left cylinder chamber 23B is divided into a rod-side liquid chamber 28A and a head-side liquid chamber 28B by a piston member 27, and the right cylinder chamber 24B is divided into a rod-side liquid chamber 29A and a head-side liquid chamber 29B.
B, and each of the liquid chambers 28A, 28B, 29A, and 29B is filled with hydraulic oil, and the left and right piston members 27 are filled with the right liquid chamber 28A and the liquid chamber 28B and the right liquid chamber 29A and the liquid. A pair of orifices 30 are formed to communicate with the chambers 29B, respectively. The cylinder body 20 has a left rod-side liquid chamber 28A, a right head-side liquid chamber 29B, a left head-side liquid chamber 28B, and a right rod-side liquid. A pair of communication passages 31 communicating the chambers 29A are provided. The two-way passage 31 is formed to have a relatively large diameter so that the hydraulic oil can flow through the two-way passage 31 with almost no flow resistance.

Next, the operation of the roll damper device 12 will be described.

When the left and right rear wheels move up and down, the left and right piston rods 13 are respectively driven to move in the axial direction via the left and right swing arms 16 and the connecting rods 17. When the left and right rear wheels move up and down in the same phase, the left and right piston members 27 are moved in opposite directions via the piston rod 13, and the hydraulic oil flows between the liquid chambers 28A Since there is substantially no flow resistance between the chambers 28B and 29A, flow resistance suppressing the movement of the piston member 27 does not occur, but when the left and right rear wheels move up and down in opposite phases, the left and right piston members Since the hydraulic fluid 27 moves in the same direction, the hydraulic oil flows between the liquid chambers 28A and 28B and between the liquid chambers 29A and 29B via the orifice 30, respectively. The movement in the direction is suppressed, and the vertical movement of the left and right rear wheels in the opposite phase is suppressed.

Since the damper device main body 14 is disposed substantially horizontally in the vehicle width direction, the required space can be reduced as much as possible, and furthermore, the front space of the cross member 2 can be effectively utilized and disposed. . Furthermore, since the vertical movement of the rear wheel is converted into a movement for moving the piston rod 13 in the substantially axial direction via the conversion mechanism 15, the load other than the axial direction hardly acts on the piston rod 13, Element
It is possible to prevent uneven wear of the outer peripheral portion of the 27 and decrease in sealing performance between the piston rod 13 and the rod guide 21 and between the piston member 27 and the inner wall portions of the cylinder chambers 23B and 24B.

As described above, by arranging the damper device body 14 substantially horizontally in the vehicle width direction, the required space of the damper device body 14 is reduced as much as possible, and the space on the front side of the cross member 2 is effectively utilized. The main body 14 can be disposed, and the swing arm 16 is formed at the inner end of the lower arm 4 and does not require a space for disposition on the lower arm 4 or the upper arm 6, so the vicinity of the lower arm 4 or the upper arm 6 The roll damper device 12 can be assembled with a good layout even when there is no room in space.

Further, since a load other than the axial direction hardly acts on the piston rod 13, it is possible to prevent the outer peripheral portion of the piston member 27 from being unevenly worn and the sealing performance of the piston rod 13 and the piston member 27 from being deteriorated. In addition, since the damper device main body 14 and the pair of left and right conversion mechanisms 15 have a simple configuration, the manufacturing cost of the roll damper device 12 is relatively low.

In this embodiment, the free piston 25 and the air chamber 23A which absorb the thermal expansion of the hydraulic oil are provided in the left and right cylinder chambers 23 and 24.
Although 24A is provided, a mechanism for absorbing the expansion of the working fluid may be separately provided outside the cylinder chambers 23 and 24.

The left and right cylinder chambers 23 and 24 are
However, a pair of left and right cylinder bodies are connected to each other to form cylinder chambers in each cylinder body, and a liquid chamber formed in each cylinder chamber is connected to a pair of communication passages 31 in the same manner as described above. It may be made to communicate by.

In the present embodiment, the present invention is applied to the rear suspension device 1 of the double wishbone type. However, the present invention can be similarly applied to the front suspension device, and can be applied to various suspension devices other than the double wishbone type. The same can be applied.

[Brief description of the drawings]

1 is a perspective view of a rear suspension device, and FIG. 2 is a cross-sectional view of a damper device main body. 12 ... Roll damper device, 13 ... Piston rod, 14 ...
... Damper device body, 15 ... Conversion mechanism, 23A / 23B ... Cylinder chamber, 27 ... Piston member, 28A / 29A ... Rod side liquid chamber, 28B / 29B ... Head side liquid chamber, 30 ... Orifice, 31
...... Communication passage.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60G 21/073

Claims (2)

(57) [Claims] 1. A cylinder body which is disposed in a vehicle width direction between left and right wheels independently suspended on a vehicle body and is formed of an integral cylinder member, and is provided inside a central portion of the cylinder body in the vehicle width direction. A partition wall, and left and right 1 formed on both sides of the partition wall in the cylinder book.
A pair of cylinder chambers, a pair of piston members respectively mounted in the pair of left and right cylinder chambers, a pair of left and right piston rods respectively connected to the piston members and extending outside the cylinder body, An orifice formed in each piston member so that the rod-side liquid chamber and the head-side liquid chamber of the partitioned cylinder chamber communicate with each other, and the up-and-down movement of the left and right wheels is used to move the left and right piston rods in the axial direction. Convert each one and transmit to piston rod 1
A pair of conversion means, and the rod-side liquid chamber and the head-side liquid chamber of the left cylinder chamber are connected to the right cylinder so that the working fluid in the liquid chamber flows through the orifice only when the left and right wheels move up and down in opposite phases. A roll damper device comprising: a communication passage communicating with a head-side liquid chamber and a rod-side liquid poem of the chamber. 2. A pair of left and right cylinder chambers are provided with free pistons for partitioning between a partition and a head-side liquid chamber, respectively, and pressurized air is filled between the pair of left and right free pistons and the partition. The roll damper device according to claim 1, wherein a pair of left and right air chambers is formed.