JPH10138937A - Power steering device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the forcible bending and providing of control cables so as to easily operate a handle by changing the direction of a handle side drum in relation to the handle, for changing the intersecting angle of a handle side bevel gear and a drum side bevel gear. SOLUTION: When a handle 1 is rotated in one direction, a handle side bevel gear 33 is integrally rotated. A drum side bevel gear 31 to be meshed with it and a handle side drum 7 integrated with it are rotated at angles corresponding to the handle. One of inner cables 6 of two control cable 4 wound on the handle side drum 7 and a steering position side drum is wound on the handle side drum to generate tension, the inner cable 6 is delivered from the drum on the steering position side, and the drum and a rotary shaft are rotated in one direction.

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. Since the handle-side drum is coaxial with the rotation axis of the handle, there is a restriction that the terminal of the control cable must be mounted at right angles to the rotation axis of the handle. 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 problems, in the above invention, the connection between the handle and the handle side drum is made coaxial with the handle side bevel gear driven by the handle and the handle side drum. This is done by engaging with the drum side bevel gear that rotates integrally.

[0005]

According to the present invention, the direction of the handle-side drum with respect to the handle is changed by changing the crossing angle between the handle-side bevel gear and the drum-side bevel gear. It is not necessary to arrange it with the handle, the operability of the steering wheel is improved, and
This has the effect of extending the life of the control cable and improving the ease of assembling the steering unit.

[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.

The casing 30 on the handle 1 side is shown in FIG.
As shown in FIG. 2, the handle-side drum 7 is bent in an L-shape, and the handle portion-side drum 7 is supported on a vertical portion so as to be freely rotatable about its rotary shaft 8. The inner cable 6 is inserted into the outer tube 5 slidably. The fixed control cable 4 is attached to the end of the outer tube 5 by the cylindrical fixing device 3.
To the casing 30.

The inner cable 6 that has entered the casing 30 from the cylindrical fixture 3 is wound around the handle-side drum 7. As shown in FIG. 3, the two inner cables 6
Are wound around the handle-side drum 7 in opposite directions, and their terminals are fixed to the handle-side drum 7.
45 ° with respect to the rotating shaft 8 on the lower surface of the handle side drum 7
Is formed, and the rotating shaft 8 fixed to the tip of the rotating shaft 32 of the handle 1 is formed.
Handle-side bevel gear 3 whose tooth surface forms an angle of 45 ° with respect to
I'm with 3

On the steering position side, the end of the outer tube 5 is attached to the casing 2 at right angles to the rotation axis of the drum (not shown) by the cylindrical attachment 3, and the inner cable 6 is wound around the drum similarly to the handle 1 side. Have been.

The rotating shaft of the drum on the steering position side protrudes from one surface of the casing 2 and is connected to a rotor 10 of a rotary valve 9 described later.

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 handle-side bevel gear 33 rotates integrally, and the drum-side bevel gear 31 meshing therewith and the handle-side drum 7 integral therewith
Is rotated by an angle corresponding to that of the handle 1, and one of the inner cables 6 of the two control cables 4 wound around the handle-side drum 7 and the drum at the steering position is wound around the drum 7 on the handle 1 side. As a result, tension is generated, and the inner cable 6 is extended from the drum on the steering position side, and the drum and the rotating shaft rotate in one direction. At this time, the inner cable 6 of the other control cable 4 is drawn out from the handle-side drum 7 and wound up on the drum at the steering position.

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

When the rotation shaft of the drum at the steering position rotates in one direction, the rotor 10 connected thereto rotates in the same direction, and the pinion 21 and the rack 18 engage to move the piston rod 17 in one direction. At this time, pressure oil is supplied from one of the ports 24 and 25 of the rotary valve 9 to one of the ports 26 and 27 of the power cylinder 14 by the rotation of the rotor 10 and the piston rod 1
7 operates in the same direction as above, and the wheel a faces one side 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 this embodiment, since the drum-side bevel gear 31 and the handle-side bevel gear 33 are engaged with each other so that their rotating shafts 8, 32 form 90 °, the control cables 4, 4 are connected to the rotating shaft of the handle 1. Although it is parallel to 32, this is because it is generally easier to wire this way on the handle side, and depending on the arrangement of parts in the engine room, it may be better to turn diagonally forward. There are two bevel gears 31, 3
What is necessary is just to change the meshing angle of No. 3.

[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 perspective view showing a state in which an inner cable is wound around a drum.

[Explanation of symbols]

 1: Handle 4: Control cable 5: Outer tube 6: Inner cable 7: Handle side drum 9: Control valve 10: Rotor 14: Power cylinder 17: Piston rod 20: Tie rod 30: Casing 31: Drum side bevel gear 33: Handle Side cap gear a: Front wheel

[Procedure amendment]

[Submission date] January 17, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

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 a rotor of the control valve, a handle drum connected by a handle, and an inner cable slidably inserted into a flexible outer tube. An automotive power steering device, comprising: two control cables wound around the two drums so that a tensile force is applied alternately in the rotation of the handle drum in an alternate direction; The handle is connected to the handle-side bevel gear driven by the handle and the hand. A power steering device for automobiles, which is designed to engage with a drum-side bevel gear that rotates coaxially and integrally with the drum-side drum.