JPH03227714A - Roll damper device - Google Patents

Abstract

PURPOSE:To make a required space small and improve the layout performance by converting vertical motion of a right and a left wheel to the rotary motion of a pair of a left and a right rod, and increasing the speed of the rotary motion to slide a pair of pistons for generating a damping force. CONSTITUTION:A front suspension device 1 restricts rolling by vertical motion of a left and a right front wheel 5 at inverse phases to each other by torsion resiliency deformation of a stabilizer bar, unillustrated, and a damping force by a roll damper device 10. In this case, the roll damper device 10 is provided with a pair of a left and a right L-letter connecting rods 13 connected with a type A arm, and a pair of speed increasing mechanisms 14 of a planetary gear type for increasing the speed of rotation of a rotary shaft part 13b of the connecting rod 13. A damping force generating mechanism 17 is also provided for generating a damping force by motion toward the shaft of a pair of a right and a left piston members 16 threaded with output shafts 15 of the speed increasing mechanism 14 respectively, and 31A, 32B and 31B, 32A separated by the piston members 16 are connected with each other by connecting passages 33, 34 respectively.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a roll damper device.

[Prior art]

Generally, a type of suspension device that independently suspends left and right wheels of a vehicle is provided with a stabilizer bar to suppress rolling and improve riding comfort and handling stability.

Usually, the stabilizer bar is a bar that extends forward or backward from the suspension arm that supports the left and right wheels.
It is formed into a substantially U-shape by a pair of arm parts and a torsion shaft part whose both ends are connected to the end parts of the arm part and whose middle part is rotatably supported by the vehicle body, and the left and right wheels are in phase with each other vertically. When it moves, it does not function as a spring at all, but when it moves in the opposite phase, the torsional elastic deformation of the torsion shaft suppresses rolling of the vehicle body.

In addition, some of the above-mentioned suspension devices are equipped with a roll damper device in order to suppress rolling more effectively. For example, Japanese Patent Application Laid-Open No. 63-265716 discloses a suspension device that is approximately U-shaped and is approximately parallel to the stabilizer bar. A control bar with a shape of A roll damper device is described that effectively suppresses rolling using the damping force of a damper.

[Problem to be solved by the invention]

By the way, there are restrictions on the installation space for the roll damper device because the suspension arm that supports the front wheel is also placed close to the suspension device including the strut, the coil springs attached to it, the stabilizer bar, etc., and the steering device. This is difficult, and it is often difficult to provide a roll damper near the suspension arm due to space constraints, as in the roll damper device described in the above-mentioned publication.

An object of the present invention is to provide a roll damper device that can be arranged with good layout efficiency by effectively utilizing the space between left and right suspension arms.

[Means to solve the problem]

The roll damper device according to the present invention includes a pair of left and right rods provided between left and right wheels that are independently suspended on a vehicle body, and a pair that converts vertical movement of the left and right wheels into rotational movement of the left and right rods, respectively. a pair of speed increasing means for increasing the rotational speed of the left and right rods, a pair of piston members respectively screwed to the output shafts of the speed increasing means; Only when the left and right wheels move up and down in opposite phases; The liquid chambers are provided with communication passages that communicate the liquid chambers in a predetermined combination so that the working fluid in the liquid chambers flows through the orifice.

[Effect]

In the roll damper device according to the present invention, the vertical movement of the left and right wheels independently suspended on the vehicle body is converted into the rotational movement of the left and right pair of mouths and throats, respectively, by the I pair of conversion means, and the rotational movement of the rod. are respectively increased in speed by the speed increasing means and transmitted to a pair of piston members screwed to the output shaft. The piston members are respectively attached to a pair of cylinder chambers formed in the casing, and are moved in the axial direction within the cylinder chambers in conjunction with the vertical movement of the wheels by rotation of the output shaft. On the other hand, the liquid chambers partitioned by each piston member are communicated through an orifice formed in the piston member and in a predetermined combination through a communication path, and when the left and right wheels move up and down in the same phase. In this case, the working fluid flows between the liquid chambers through the communication path, so no damping force is generated.However, when the working fluid moves up and down in the opposite phase, the working fluid flows between the liquid chambers through the orifice, and the working fluid The flow resistance generates a damping force that suppresses the vertical movement of the left and right wheels in opposite phases.

As mentioned above, since the rotational speed of the rod is increased by the speed increasing means, a damping force generation mechanism consisting of a piston member, a cylinder chamber, an orifice, a communication passage, etc., suppresses the vertical movement of the left and right front wheels in opposite phases. Sufficient damping force can be obtained even with a relatively small structure, and since the speed increasing means and damping force generation mechanism are provided between the left and right rods, a small space is required between the left and right rods. The speed increasing means and the damping force generating mechanism can be installed by effectively utilizing the space, and the roll damper device can be installed without using much of the space near the suspension arm, which is subject to severe restrictions.

〔Effect of the invention〕

According to the roll damper device according to the present invention, the above [effect]
As detailed in the above section, by increasing the rotational speed of the rod using the speed increasing means, the damping force generating mechanism consisting of the piston member, cylinder chamber, orifice, communication passage, etc. can be downsized, and the speed increasing means By providing a damping force generating mechanism between the left and right rods, the roll damper device can be installed by effectively utilizing the space between the suspension arms without using much of the space near the suspension arms. The layout of the device can be improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is a case in which the present invention is applied to an independent suspension type front suspension device for an automobile, which is composed of a combination of an A-type arm and a strut.

As shown in FIG. 1, a front suspension device 1 for an automobile includes a substantially U-shaped subframe 2 that is assembled to the lower part of an engine compartment, and is supported by the subframe 2 so as to be swingable about an axis in the longitudinal direction. A pair of left and right A-type arms 4, and a hydraulic shock absorber that connects the inner arm portions of the wheel support members 6 to which the front wheels 5 are fixed to the vehicle body, respectively.
It basically consists of a pair of struts 7, a coil spring 8 mounted on each strut 7, a stabilizer bar (shown in the diagram) that connects the left and right A-type arms 4, and a roll damper device 10, and the front wheel 5 is The roll ring caused by vertical movement is suppressed by the spring force of torsional elastic deformation of the stabilizer bar and the damping force of the roll damper device 10.

The roll damper device 10 includes a pair of left and right support rods 12 erected on the A-shaped arm 4, a pair of left and right L-shaped connecting rods 13 connected to the upper end of the support rod 12,
In the axial direction of a pair of speed increasing mechanisms 14 that increase the rotational speed of the rotating shaft portion 13b of the connecting rod 13, and a pair of left and right piston members 16 screwed onto the output shafts 15 of both speed increasing mechanisms 14, respectively. The vehicle is equipped with a damping force generating mechanism 17 that generates a damping force that suppresses the vertical movement of the left and right front wheels 5 in opposite phases due to the movement of the wheels.

As shown in FIG. 1, each of the connecting rods 13 has an arm portion 13a that is rotatably supported by the upper end portion of the support rod 12 around an axis in the left-right direction and extends rearward, and an arm portion 13a extending rearward from the rear end portion of the arm portion 13a to the vehicle body. It is integrally formed in an oval shape with a rotating shaft portion 13b extending substantially horizontally to the inside of the rotating shaft portion 13b, and the middle portion of the rotating shaft portion 13b is rotatably supported by the vehicle body via a bracket 18.
The rotation shaft portions 13b of the left and right connecting rods 13 are rotated in the same direction when the front wheels 5 move up and down in the same phase, and rotated in opposite directions when the front wheels 5 move up and down in opposite phases. Note that the converting means is composed of a support rod 12, an arm portion 13a, and a bracket 18.

As shown in FIG. 2, a substantially cylindrical casing 19 is provided between the left and right rotating shaft portions 13b, and the casing 1
9 is fixed to the vehicle body via a bracket (not shown), a cover member 20 is fixed to both left and right ends of the casing 19, and a portion near the inner end of the rotating shaft portion 13b is attached to the cover member 20 via a bearing 21. The casing 1 is rotatably supported.
A housing part 22 for housing the speed increasing mechanism 14 is formed in the left and right parts of the cylinder 9, and a pair of left and right cylinder chambers 23 and 24 partitioned by a partition wall part 19a is formed in the center part.
The housing portion 22 and the cylinder chambers 23 and 24 are partitioned off by a lid member 25 in a liquid-tight manner.

Each speed increasing mechanism 14 is a planetary gear type speed increasing mechanism, and is configured as follows. Note that the left and right speed increasing mechanisms 14 have the same configuration, so the right one will be explained.

As shown in FIGS. 2 and 3, the partition wall 19a and the lid member 2
5, an output shaft 15 is rotatably supported on the same axis as the rotating shaft portion 13b, and a sun gear 2 is provided at the right end of the output shaft 15.
7 is fixed, and a substantially disk-shaped input plate 28 is fixed to the left end portion of the rotating shaft portion 13b extending into the housing portion 22, and the outer peripheral portion of the input plate 28 is bent leftward. A ring gear 29 is formed on the periphery, and three planet gears 30 that mesh with the sun gear 27 and the ring gear 29 are rotatably supported on the lid member 25, and the rotation of the rotating shaft portion 13b is caused by the ring gear 29 and the planet gears 30. The speed is increased and transmitted to the output shaft 26 via the sun gear 27. Note that, due to the speed increasing mechanism 14, each output shaft 15 is connected to the corresponding rotating shaft portion 13.
It is rotated at an increased speed in the direction opposite to b.

To explain the damping force generation mechanism 17, as shown in FIG. Threaded portion 1 formed in the middle of
5a, and is attached to the casing 19 so as not to rotate relative to each other via guide portions 19b formed to protrude from the outer wall of the casing 19 into the cylinder chambers 23, 24. 24 is a liquid chamber 31A, 31B and a liquid chamber 32A, 32B by a piston member 16.
The left and right piston members 16 each have a liquid chamber 31.
An orifice 35 that communicates between A and 31B and between the liquid chambers 32A and 32B is formed, and a first communication passage 3 that communicates the pair of outer liquid chambers 3IA and 32B is formed in the outer wall of the casing 19.
3 is formed, and a pair of inner liquid chambers 31B are formed in the partition wall portion 19a.
- A pair of second communication passages 34 are formed that communicate with 32A. The double-speed passages 33 and 34 are formed to have a relatively large diameter, and the working fluid flows through the double-speed passages 33 and 34 with almost no flow resistance.
34 can be distributed.

Next, the operation of the roll damper device 10 will be explained.

When the left and right front wheels 5 move up and down, the up and down movement of the front wheels 5 is transferred to the left and right rotation shafts 1 via the support rod 12 and the arm portion 13a.
3b, the rotation of each rotating shaft portion 13b is accelerated by the speed increasing mechanism 14, and the output shaft 15 is driven to rotate at an increased speed, and the left and right piston members 16 screwed to the output shaft 15 is driven to move in the axial direction of the output shaft 15.

When the left and right front wheels 5 move vertically in the same phase, the left and right output shafts 15 are rotationally driven in the same direction, so the left and right piston members 16 also move in the same direction, and the working fluid flows through both speed passages. A pair of liquid chambers 31A and 3 on the outside via 33 and 34.
2B and between the pair of inner liquid chambers 31B and 32A with almost no flow resistance, and there is no flow resistance that suppresses the movement of the piston member 16. However, when the left and right front wheels 5 move up and down in opposite phases, the left and right Since the output shaft 15 of the left piston member 16 also moves in the opposite direction, the working fluid passes through the orifice 35 and flows between the liquid chambers 31A and 31B and between the liquid chambers 32A and 32B. The movement of the piston member 16 is suppressed by the damping effect due to the resistance of the working fluid, and the vertical movement of the left and right front wheels 5 in opposite phases is suppressed, thereby damping the rolling of the vehicle body.

By increasing the rotational speed of the rotating shaft portion 13b using the speed increasing mechanism 14, the damping force generating mechanism 17 can be downsized while ensuring sufficient damping force. Since it is provided between the left and right rotating shaft parts 13b on the same axis as the rotating shaft part 13b, it can be arranged in a small space around the left and right rotating shaft parts 13b, and the A-type arm 4 has no support. The roll damper device 10 can be installed simply by securing a space for erecting the rod 12.

As described above, by increasing the rotation speed of the rotating shaft portion 13b by the speed increasing mechanism 14, the damping force generating mechanism 17 can be downsized while ensuring sufficient damping force, and the speed increasing mechanism 14 and the damping force The generation mechanism 17 is connected to the left and right rotating shaft portions 13b.
By providing it on the same axis as the rotating shaft portion 13b,
The space between the left and right A-shaped arms 4 can be effectively used to arrange the roll damper device 10, and the layout of the roll damper device 10 can be improved.

In addition, when one of the screw portions 15a formed on the left and right output shafts 15 is formed with a reverse thread, as shown in FIG. At the same time, when the left and right front wheels 5 move up and down in the same phase and the piston member 16 moves in the opposite direction, the working fluid flows through the dual-speed passages 33A and 32B. 34A so that no damping force is generated, and when the piston member 16 moves in the same direction by moving up and down in opposite phases, the working fluid flows through the orifice 3.
5 may be circulated to generate damping force.

In the above embodiment, the present invention was applied to the independent suspension type front suspension device 1, but the present invention can also be applied to a rear suspension device in the same manner as described above.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a perspective view of a front suspension device, FIG. 2 is a cross-sectional view of a roll damper device, FIG. 3 is a sectional view taken along the line FIG. 4 is a diagram corresponding to FIG. 2 according to a modified example. 5...Front wheel, 12...Support rod, 13...Connection rod, 13a...Arm part, 13b...Rotating shaft part, 14...Speed-up mechanism, 15...Output shaft,
15a...Thread part, 16...Piston member, 1
9...Casing, 23,24...Cylinder chamber,
31A・31B・32A・32B・・Liquid chamber, 33・3
3A...first communication path, 34.34A...second communication path,
35... Orifice.

Claims (1)

[Claims] (1) a pair of left and right rods provided between left and right wheels independently suspended on the vehicle body; a pair of conversion means for converting the vertical motion of the left and right wheels into rotational motion of the left and right rods, respectively; a pair of speed increasing means for respectively increasing the rotational speed of the left and right rods; a pair of piston members respectively screwed to the output shafts of the speed increasing means; and a pair of piston members respectively accommodating the piston members. A casing including a cylinder chamber, an orifice formed in the pair of piston members and communicating with the liquid chamber partitioned by the piston member, and a working fluid in the liquid chamber only when the left and right wheels move up and down in opposite phases. A roll damper device comprising a communication path that communicates liquid chambers in a predetermined combination so as to flow through an orifice.