KR20030085884A - Active center feel device of steering system for vehicle - Google Patents

Abstract

PURPOSE: An active center feel device of a steering system for a vehicle is provided to reduce the size of a hydraulic control valve by installing the active center feel device between a torsion bar and an input shaft. CONSTITUTION: A steering system for a vehicle has a pinion shaft, into which a part of an input shaft(20) is inserted, and a torsion bar(30). An active center feel device of the steering system has a center support unit outside the torsion bar to secure natural centering and a straight running performance by suppressing rotating force of the torsion bar. The center support unit comprises a support rod(40) fixed to the outer face of one end of the torsion bar; a moving rod(50) installed to the outer face of the other end of the torsion bar to move in an axial direction; a spring(60) elastically supporting the moving rod toward the support rod; a stopper(70) fixing the spring; slant faces(41,51) formed to the facing ends of the support rod and the moving rod; a center pin(80) movably installed between the slant faces; and a center groove(31) formed outside the torsion bar. A part of the center pin is inserted into the center groove.

Description

ACTIVE CENTER FEEL DEVICE OF STEERING SYSTEM FOR VEHICLE}

The present invention relates to an active center fill device for a vehicle steering system, and more particularly, to an active center fill device for a vehicle steering system in which an active center fill device is provided outside the torsion bar to downsize the hydraulic control valve.

In general, a hydraulic control valve is installed between the steering shaft and the gearbox of the vehicle steering system to transmit the rotational force to the gearbox and to control the hydraulic pressure supplied to the gearbox.

That is, an input shaft connected to the steering shaft is installed inside the hydraulic control valve, and a pinion shaft is installed at the lower end thereof to achieve mechanical power transmission, and a valve body for adjusting the flow path according to the relative angular displacement outside the input shaft. Is installed.

In addition, an active center feel device is installed between the input shaft and the valve body so that the centering of the steering wheel can be induced naturally and the linear driving of the vehicle can be guaranteed.

1 is an exploded perspective view showing such a conventional active center fill device. As shown in the drawing, the lower end of the input shaft 2 has a radial play and is inserted to transmit the rotational force inside the pinion shaft 1 in which the pinion gear 1a is formed at the lower end side.

In addition, a torsion bar 3 is installed inside the pinion shaft 1 and the input shaft 2, and one end of the torsion bar 3 is fixed to the upper side of the input shaft 2, and the other end thereof is the pinion shaft 1. It is fixed to the inner lower side of the and generates a torsional elastic force therebetween.

That is, when the resistance acts due to the friction between the wheel and the ground, the torsion bar 3 is twisted and the hydraulic pressure is moved between the valve body 4 and the input shaft 2 to steer the wheel and torsion according to the steering of the wheel. Bar 3 is to be restored.

On the other hand, the active center fill device is provided by the center groove (2a) formed on both sides of the outer peripheral surface of the input shaft (2) and the valve body (4) to be fixed in the rotational direction and to be movable in the radial direction, the center groove It consists of the center pin 5 inserted into and removed from (2a).

In addition, a sleeve 6 is provided at the upper end side of the valve body 4 to guide the radial movement of the center pin 5, and a plunger 7 at its radially outer side to press the center pin 5 toward the center side. And a C-shaped spring 8 are installed.

In addition, the upper end of the sleeve 6 to prevent the center pin (5), the plunger (7) and the spring (8), which is supported on one side in the axial direction by the sleeve (6) axially separated from the sleeve (6) The cover plate 9 is fixedly installed.

However, the active center fill device of the conventional vehicle steering system configured as described above has a problem in that the overall appearance of the hydraulic control valve is increased because the active center fill device is provided at the input shaft and the outside thereof.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an active center fill device for a vehicle steering system in which an active center fill device is formed between a torsion bar and an input shaft so as to downsize the hydraulic control valve. .

1 is an exploded perspective view of a conventional active center fill device.

2 is a cross-sectional view of an active center fill device according to the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along line B-B of FIG. 2.

5 is a view illustrating C of FIG. 2.

<Explanation of symbols for the main parts of the drawings>

10: valve body 20: input shaft

30: torsion bar 31: center home

40: support 41, 51: inclined surface

42,52: Guide groove 50: Mobile platform

53: guide protrusion 60: spring

70: stopper 80: center pin

81: tapered portion

Active center fill device of the vehicle steering system of the present invention for achieving the above object, a pinion shaft having a play in the direction of rotation while a portion of the input shaft is inserted into one end to receive a rotational force, and the input shaft and the pinion shaft inside In the steering system for a vehicle having a torsion bar coupled to both ends thereof and twisted therebetween, the center support means is provided on the outside of the torsion bar to suppress the rotational force of the torsion bar to ensure natural centering and straight running. It is characterized by.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention;

2 is a cross-sectional view of an active center fill device according to the present invention. As shown in the figure, a hollow input shaft 20 is inserted into the valve body 10 so as to be rotatable, and the torsion bar 30 is installed inside the input shaft 20 at predetermined intervals.

The upper end side of the torsion bar 30 is connected to the upper end side of the input shaft 20, and the lower end side is fixed to the inside of the pinion shaft 90 to generate a rotational direction gap between the input shaft 20 and the pinion shaft 90. When it is twisted between them.

On the other hand, in the present invention, the center support means is provided as an active center feel device so as to guide the centering of the steering wheel to be natural and to ensure the straight running of the vehicle.

The center support means has a support 40 which is fixed to one end side of the torsion bar 30, and the other end of the torsion bar 30 so that one end of the torsional side is opposite to the front end of the support 40, and is movable in the axial direction. A movable table 50 provided on the outer side of the short side is provided.

At this time, the inclined surfaces (41, 51) are formed on the front end of the support 40 and the movable table 50 to be inclined toward the center, due to the inclined surfaces (41, 51), the support 40 and the movable table (50) ), The outer circumferential side is formed longer than the inner circumferential side.

In addition, a spring 60 is provided at the rear thereof so as to elastically support the movable table 50 installed to be axially movable toward the support 40 side, and again at the rear thereof so as to support one end of the spring 60. The stopper 70 is fixed to the torsion bar 30.

In addition, between the inclined surfaces (41, 51) is provided with a center pin (80) having tapered portions (81) which are inclinedly reduced in diameter at both ends so as to be in close contact with the outer peripheral surface side of the torsion bar (30), the center pin (80) Guide grooves 42 and 52 are formed at the ends of the support 40 and the movable table 50 on which the inclined surfaces 41 and 51 are formed so as to guide the radial movement of the support 40.

In addition, as shown in Figures 3, 4 and 5, the center groove 31 is formed on the outer circumferential side of the torsion bar 30 so that a portion of the center pin 80 can be inserted, the movable table 50 An inner surface of the guide protrusion 53 is formed to be inserted into the center groove 31 to be guided in the axial movement.

In the active center fill device of the vehicle steering system of the present invention configured as described above, when the vehicle is traveling straight, the center pin 80 is supported by one side by the support 40 and the other side by the movable table 50. Since it is elastically supported in the direction, it is in close contact with the center side by the inclined surfaces (41, 51) formed on the support 40 and the movable table 50 and both ends corresponding thereto.

At this time, the center groove 31 is formed at the center side, so that the center pin 80 remains seated inside the center groove 31, and the torsion bar 30 is rotated when the vehicle is steered to the left and right sides. In this case, since the center pin 80 is required to have a greater steering force to be separated from the outside of the center groove 31, the driving force of the vehicle and the centering of the steering wheel are naturally induced.

As described in detail above, the active center fill device of the steering system for a vehicle according to the present invention is an active center fill device between an input shaft and a torsion bar, and has a merit that a center support means can be provided to reduce the size of the hydraulic control valve. have.

Claims (4)

In the steering system for a vehicle having a pinion shaft having a portion of the input shaft is inserted into one end side to receive a rotational force, and the play in the direction of rotation, and a torsion bar that is coupled to both ends of the input shaft and the pinion shaft, respectively, and is twisted therebetween. , An active center fill device for a vehicle steering system, characterized in that a center support means is provided on the outside of the torsion bar so as to suppress rotational force of the torsion bar to ensure natural centering and straight running. The method of claim 1, The center support means is a support that is fixed to the outer surface of one end of the torsion bar, and the movable table is installed on the other end side of the torsion bar so that the front end of the one side is movable in the axial direction facing the front end of the support; And a spring for elastically supporting the movable table toward the support side, a stopper for fixing the spring, an inclined surface formed to be inclined toward the center at the ends facing the support and the movable table, and installed to be movable radially between the inclined surfaces. The center pin of the steering system for a vehicle, characterized in that the center pin is formed inclined at both ends to be in close contact with the outer peripheral surface side of the torsion bar, and the center groove provided on the outer side of the torsion bar so that a portion of the center pin is inserted. . The method of claim 2, Active center fill device of the steering system for a vehicle, characterized in that the guide groove is provided at the front end of the support and the movable guide to guide the radial movement of the center pin. The method of claim 2, Active center fill device of the steering system for a vehicle, characterized in that the guide projection is formed on the inner surface of the movable table is inserted into the center groove to be guided in the axial movement.