JPH10138938A - Power steering device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that it may be necessary to dispose the control cable by bending it by force in a usual power steering device which uses two control cables the inner cable of which is wound on the drums on the steering wheel side and the power cylinder side so that the sliding resistance of the inner cable is increased to impair the operability of the steering wheel, as well as to shorten the life of the control cable. SOLUTION: On a casing 30 which supports a steering wheel side drum 7, a rotary guide member 32 the axis of which is right angle to the axis of the steering wheel side drum 7 is supported, the terminal of an outer tube 5 is attached to the casing 30 from an optional certain direction, and an inner cable 6 is hung on the rotary guide member 32 to be wound on the steering wheel side drum 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power steering apparatus for an automobile using two control cables and a power cylinder which act on a pulling force. The present invention relates to a power steering device for an automobile.

[0002]

2. Description of the Related Art The applicant of the present application discloses a power cylinder having a piston rod connected to a front wheel via a steering link mechanism at both ends, and is supplied to the power cylinder and simultaneously discharged from the power cylinder. A rotary control valve for controlling the direction of pressurized oil, a valve-side drum connected to the rotor of the control valve, a handle-side drum connected to the handle, and a freely sliding inside the flexible outer tube. Patent application for a power steering apparatus for an automobile, wherein the inner cable inserted includes two control cables wound around both drums so that tensile force acts alternately when the handle side drum is rotated in an alternate direction. And
The application was published as JP-A-8-2431.

[0003]

The invention according to this patent application has an advantage that the steering force is transmitted by using the control cable, so that it is possible to bend and route the narrow engine room. In order to prevent the inner cable from coming off the handle-side drum, it must be attached to the casing supporting the handle-side drum so that the end of the outer tube is perpendicular to the axis of the drum. For this reason, it may be necessary to bend the control cable forcibly, and the sliding resistance of the inner cable increases, the operability of the handle is reduced, and the life of the control cable is shortened. is there.

[0004]

According to the present invention, as a means for solving the above-mentioned problems, in the above-mentioned invention, there is provided a rotary guide member having an axis perpendicular to the axis of the handle-side drum in a casing supporting the handle-side drum. And the end of the outer tube is attached to the casing from an arbitrary fixed direction, the inner cable is hung on the rotation guide member, and then wound around the handle side drum.

[0005]

According to the present invention, the terminal of the outer tube is attached to the casing from an arbitrary fixed direction. Therefore, it is not necessary to forcibly bend and route the control cable, and the operability of the handle is reduced. And the life of the control cable is extended, and the assemblability of the steering unit is improved.
Since the inner cable is wound around the handle-side drum after being hung on the rotation guide member, the inner cable may be wound almost perpendicularly to the handle-side drum and come off the drum regardless of the mounting direction of the outer tube to the casing. There is no effect.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a handle, which is rotatably supported by a casing 30 attached to a vehicle body.

A casing 2 is disposed at a steering position in front of the vehicle body, and two terminals are fixed between the casings 30 and 2 to the casings 30 and 2 by means of a cylindrical fixing member 3. A control cable 4 is provided.

As shown in FIG. 3, the casing 30 on the handle 1 side is bent in an L-shape, and the drum 7
The control cable 4 in which the inner cable 6 is freely slidably inserted into the outer tube 5 is supported by the cylindrical fixing member 3 at the end of the outer tube 5. A male screw 11 formed on the outer periphery thereof is screwed into a nut 12 fixed to the lower surface of the casing 30 which is bent downward. The nut 13 is fixed.

An elongated roller-shaped rotation guide member 32 is supported at a bent portion of the casing 30 by a shaft 31 at a right angle to the rotation shaft 8 of the drum 7, and an inner cable inserted into the casing 30 from the cylindrical fixture 3. 6 is a rotation guide member 3
2 and is bent at a substantially right angle and wound around the drum 7. As shown in FIG. 4, the winding directions of the two inner cables 6 around the drum are opposite to each other, and the terminals are fixed to the drum 7.

On the steering position side, the end of the outer tube 5 is attached to the casing 2 in a direction perpendicular to the rotating shaft 8 of the drum 7, and the inner cable 6 is wound around the drum 7 as it is, The mounting structure and the method of winding the inner cable 6 around the drum 7 are the same as those on the handle 1 side.

The rotating shaft 8 of the drum 7 has casings 30, 2
Of the handle 1 and the handle 1
Are connected to a rotor 10 of a rotary valve 9 to be described later on the steering position side.

Reference numeral 14 denotes a cylinder tube 15 and a piston 1
6 is a power cylinder in which the piston 6 is slidably fitted, a rack 18 is formed by extending one side of a piston rod 17 fixed to the piston 16, and tie rods 20 are connected to both ends via ball joints 19. The tie rod 20 is connected to a front wheel a via a knuckle arm (not shown).

In the present invention, the tie rod 20, the knuckle arm and the like are collectively referred to as a steering link mechanism.

A pinion 21 is fixed to the rotor 10 of the rotary valve 9 and meshes with the rack 18.

The supply port 22 of the rotary valve 9 is connected to a hydraulic pump (not shown), and the discharge port 23 is connected to a tank (not shown).
5 is connected to two ports 26, 27 of the cylinder tube 15 by pipes 28, 29,
When 0 rotates in one direction, pressure oil is supplied to one side of the piston 16 and is discharged from the other side, and when rotated in the other direction, pressure oil is supplied to the other side of the piston 16 and discharged from one side. , The piston 16 operates together with the piston rod 17.

Next, the operation of this embodiment will be described.

When the handle 1 is rotated in one direction, the drum 7 on the handle 1 rotates by the same angle as the handle 1 and the inner of two control cables 4 wound around the drum 7 and the drum 7 on the steering position. One of the cables 6 is wound on the drum 7 on the handle 1 side to generate tension, and the inner cable 6 is paid out from the drum 7 on the steering position side, and the drum 7 and the rotating shaft 8 rotate in one direction. At that time, the inner cable 6 of the other control cable 4
Is fed out of the drum 7 on the steering wheel 1 side and wound on the drum 7 on the steering position side.

When the handle 1 is rotated in the other direction, the drum 7 on the steering position side and its rotating shaft 8 rotate in the other direction by the same operation.

When the rotating shaft 8 of the drum 7 at the steering position rotates in one direction, the rotor 10 connected thereto rotates in the same direction, and the engagement between the pinion 21 and the rack 18 causes the piston rod 17 to move in one direction. At this time, the rotation of the rotor 10 causes the rotary valve 9 to rotate.
Pressure oil is supplied from one of the ports 24, 25 to one of the ports 26, 27 of the power cylinder 14, the piston rod 17 operates in the same direction as described above, and the wheel a faces one via the steering link mechanism. .

When the rotation center shaft 8 of the drum 7 at the steering position rotates in the other direction, the wheel a faces the other by the same operation.

In the present embodiment, the end of the outer tube 5 of the control cable 4 is attached in a direction parallel to the rotation shaft 8 of the drum 7 on the handle 1 side.
This is because, on the handle side, it is generally easier to route the cable downward. Depending on the arrangement of the components in the engine room, it may be better to face diagonally forward. Is to be determined.

Further, in this embodiment, an elongated roller is used as the rotation guide member 32, but a pulley having a groove may be used.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of one embodiment of the present invention.

FIG. 3 is a sectional view of one embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which the inner cable according to the embodiment of the present invention is wound around a drum.

[Explanation of symbols]

 1: handle 4: control cable 5: outer tube 6: inner cable 7: drum 9: control valve 10: rotor 14: power cylinder 17: piston rod 20: tie rod 30: casing 32: rotation guide member a: front wheel

Claims (1)

[Claims] 1. A power cylinder having a piston rod connected at both ends to a front wheel via a steering link mechanism, and a direction control of pressure oil supplied to the power cylinder and simultaneously discharged from the power cylinder. A rotary control valve, a valve drum connected to the rotor of the control valve, a handle drum connected to the handle, and an inner cable slidably inserted into a flexible outer tube. A casing for supporting the handle-side drum, comprising: two control cables wound around the two drums so that a tensile force is applied alternately when the handle-side drum rotates in an alternate direction. The rotation guide member whose axis is perpendicular to the axis of the handle-side drum A power steering device for an automobile, wherein the end of the outer tube is attached to the casing from an arbitrary fixed direction, the inner cable is hung on the rotation guide member, and then wound around the handle side drum.