KR20030016853A - Apparatus for compensation of steering force in power steering system - Google Patents

Abstract

PURPOSE: A steering force adjusting device of a hydraulic power steering system is provided to improve travelling stability upon driving at a high speed by operating a torsion bar only when power more than a certain level is given. CONSTITUTION: A gear linkage installed with a steering force adjusting device includes a housing, a torsion bar(45) installed in the center of the housing, a pinion shaft(46) covering the torsion bar and a valve(47) operated by the change of a moment according to the operation of the torsion bar. Two guide protrusions(101) are fixed on an upper face of the valve and a supporting portion(102) is fixed on one side of the pinion shaft. Both ends of a leaf spring(103) covering the outer circumference of the pinion shaft are connected to both sides of the guide protrusion and the supporting portion. Thereby, the leaf spring elastically supports both sides of the guide protrusion and the supporting portion so that the torsion bar is operated only when power more than a certain level is given.

Description

Steering force compensator of hydraulic power steering system {Apparatus for compensation of steering force in power steering system}

The present invention relates to a device for compensating steering power in a hydraulic power steering device, in particular, the torsion bar in the gearing package of the hydraulic power steering device to be operated when a certain amount of force is applied to improve the driving stability during high-speed driving of the vehicle. A steering power compensator of a hydraulic power steering device.

In general, a vehicle is provided with a steering device so that the driving direction of the vehicle can be arbitrarily changed while driving, and in recent years, the driving force of the steering wheel by the driver is doubled at low speed to add steering speed and convenience. In addition, hydraulic or electric power steering systems have been developed to reduce the operating force of the steering wheel and to add stability when steering at high speed.

1 illustrates a configuration of such a hydraulic power steering device. The power steering device includes a steering wheel 1 provided in a driver's seat and a steering column coupled to the steering wheel 1 so that a driver can operate the vehicle for changing a driving direction. 2) and the steering gear portion 5 from the oil pump (not shown) is coupled to the end of the universal joint (3) connected to the steering column (2) in accordance with the rotation of the steering column (2) by operating the handle (1) ) Is composed of a gearing kit (4) for controlling the oil supply to the left and right hydraulic cylinder (6).

The gearing package 4 surrounds the torsion bar 45 coupled with the housing 41, the universal joint 3 connected to the steering column 2, and the torsion bar 45 as shown in FIG. When the torsion bar 45 is twisted by the driver's handle 1, the moment the valve 47 operates as shown in Figs. 3A to 3C. The fluid introduced through the input port 42 of the housing 41 is supplied to the left and right cylinders 6 (see FIG. 1) through the left and right hydraulic cylinder ports 44. Reference numeral 43 is a return port through which the fluid is returned to the oil pump (not shown).

4A and 4B illustrate a process in which the flow of the fluid introduced into the valve is returned. The fluid introduced into the valve 47 includes the first return hole 48a, the second return hole 48b, and the third return. It returns through the hole 48c one by one.

However, according to the conventional gear steering kit 4 for the power steering device, the following problems occur in the high speed driving state because the steering adjustment is made only by the torsion bar 45.

First, the neutrality of the steering wheel is weakened when driving in the straight state, and the steering wheel moves to the left and right when driving straight. Third, the steering wheel restoring power is weak in the third small rotation. In addition, when restoring after the fifth abrupt rotation, the steering wheel passes through the neutral to play left and right.

Accordingly, the present invention has been made in order to solve the above problems, the torsion bar of the gearing kit of the power steering device to be operated when a certain amount of force is applied to the hydraulic power to obtain a stable steering force even at high speed driving state. It is an object of the present invention to provide a steering force compensating device for a steering device.

1 is a perspective view showing the configuration of a general hydraulic power steering device,

Figure 2 is a longitudinal cross-sectional view showing the main portion of the structure of the gear ring used in the conventional hydraulic power steering device,

3a to 3c are cross-sectional views showing the operating state of the torsion bar and the valve of the gearing kit of Figure 2, respectively,

3a shows the torsion bar is in a neutral state,

3b shows that when the torsion bar is rotated to the left,

3C shows when the torsion bar is rotated to the right.

4A and 4B are views illustrating a process of returning a fluid flow introduced into an input port from the gearing kit of FIG. 1, respectively;

FIG. 5 is a sectional view of the gearing package structure to which the steering force correcting apparatus according to the present invention is applied, as a corresponding diagram of FIG.

6 is a plan view showing the steering force correction device of the present invention.

Explanation of Reference Symbols in Major Parts of Drawings

4-Gearing Kit 41-Housing

45-Torsion Bar 46-Pinion Shaft

47-valve 101-protrusion

102-Support 103-Leaf Spring

In order to achieve the above object, the present invention, the torsion bar that rotates in accordance with the handle operation, the pinion shaft is installed to surround the torsion bar, and operates by the moment generated by the rotation of the torsion bar and the hydraulic flow In the configuration including a valve for controlling, a pair of guide protrusions formed on the upper surface of the valve, the support portion is fixed to the pinion shaft so as to be located between the guide projections, and the both sides of the guide protrusion and the support portion It provides a steering force correction device of a hydraulic power steering device, characterized in that it comprises an elastic member installed to elastically support.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the steering force correction device of the power steering apparatus according to the present invention will be described in detail.

5 and 6 show the structure of the gearing kit installed with the steering force correction device according to the present invention, the gearing kit 4 is a housing 41, the torsion bar 45 is built in the center of the housing 41 and The pinion shaft 46 is installed to surround the torsion bar 45, and is located between the outer side of the pinion shaft 46 and the inner surface of the housing 41 and changes the moment due to the operation of the torsion bar 45. It is configured to include a valve 47 that operates by.

Here, two guide protrusions 101 are fixed to the upper surface of the valve 47 at a predetermined distance, and a support part positioned between the guide protrusions 101 on one side of the pinion shaft 46. 102 is fixed, the support portion 102 is fixed to the pinion shaft 46 by its engaging projection 102a is inserted into the groove 46a on one side of the pinion shaft 46.

In addition, both ends of the guide protrusion 101 and the support part 102 are installed to contact both ends of the leaf spring 103 which surrounds the outer circumference of the pinion shaft 46, and the leaf spring 103 is torsional. When the bar 45 is operated, the guide protrusion 101 and the side of the support 102 are elastically supported so that the torsion bar 45 can be operated by receiving a predetermined force or more.

Therefore, when the driver manipulates the steering wheel for steering while the vehicle is running, the torsion bar 45 is not operated by the elastic force of the leaf spring 103 when the operating force applied to the steering wheel is minute, and the steering wheel has a predetermined amount or more. Only when force is applied is the torsion bar 45 to overcome the elastic force to operate.

As described above, according to the present invention, since steering control can be obtained only when a predetermined amount of force is applied to the torsion bar, the steering neutrality is improved even when driving at high speed, and the steering wheel is not moved left and right, and the steering is stable during driving. Inertia is secured and driving stability is improved.

In addition, the handle restoring force becomes clear even at a small rotation, and since the handle does not pass the neutral during the restoration after the rapid rotation, the phenomenon in which the handle plays from side to side does not occur.

Claims (2)

A torsion bar that rotates according to a handle operation, a pinion shaft installed to surround the torsion bar, and a valve which operates by a moment generated by the rotation of the torsion bar and controls a hydraulic flow, A pair of guide protrusions spaced apart from the upper surface of the valve, a support portion fixedly installed on the pinion shaft to be positioned between the guide protrusions, and an elastic member installed to elastically support both side portions of the guide protrusion and the support portion. Steering force correction device of a hydraulic power steering, characterized in that configured to. The method of claim 1, wherein the elastic member is characterized in that the leaf spring surrounds the outer periphery of the pinion shaft and one end to support one side of the guide protrusion and the support portion and the other end to support the other side of the guide protrusion and the support portion. Steering force correction device for hydraulic power steering system.