KR20000018794A - Steering stability improving device for vehicle - Google Patents

Abstract

PURPOSE: A steering stability improving device of a vehicle is provided to maintain a steering wheel in a good state all the time in spite of the abrasion due to the long use by installing a control tool able to control the ball elastically installed on a spring and the elasticity. CONSTITUTION: A device is composed of: a hydraulic pressure control valve part(100) installed in a housing(101) to be embedded being consist of a torsion bar(110), an input shaft(120) and a valve body(13); a hydraulic pressure operation part(200) embedded in a gear box(201) being consist of a worm shaft(210) able to rotate by being consist of the torsion bar, a spiral groove(211) of the worm shaft and a ball nut part(220) and a steering operation part(300) being consist of a pinion(311) interlocked to the rack(231) of a rack piston and a sector shaft(310) including the pinion.

Description

Vehicle Steering Stability Improvement Device

The present invention relates to a steering stability improving device for a vehicle, and more particularly, a steering wheel is rotated to the left and right at high speed while steering, and is characterized by adding a new configuration to increase the rotation torque at the neutral position.

In general, the power steering device of a vehicle makes it easy to park the vehicle by steering with a relatively small force at low speed, and on the contrary, the steering safety can be improved by allowing a steering with a relatively large force at high speed. In this case, when the handle is operated from the left end to the right end, the torque value for the operation in the center portion is increased to improve the linear safety.

In order to satisfy these characteristics, the conventional steering system uses a method of changing the ratio of gears and a method of increasing the rotational direction torque at neutral.

The method of changing the ratio of gears is the "A" portion corresponding to the neutral position when the pinion 311 of the sector shaft 310 engages the rack 231 of the rack piston 230 as shown in FIG. The gear ratio in the center portion is made heavier than the gear ratio in the left and right sides compared to the gear ratio of the "B" portion on both sides.

In addition, a method of increasing the rotational direction torque is a worm shaft 210 embedded in the rack piston 230 and a ball screw moving along the spiral groove 211 of the worm shaft 210 as shown in FIG. The rigid ball 221 is configured by specially processing the spiral groove 211 so that it is difficult to move in the "C" section corresponding to the position of the neutral.

However, in the conventional method as described above, the pinion 311 and the rack 231 are engaged, but the "A" portion that is frequently engaged, and the "C" section where the rigid balls 221 frequently contact, the longest wear rate. If used, they will not function properly.

Therefore, the present invention has been made to solve the conventional problems as described above, the main object of the invention is to rotate the torque in a neutral position when steering by turning the handle to both left and right sides, but the coal to the spring By installing the adjustment mechanism that can adjust the ball and elasticity, even if the wear occurs by long-term use to compensate for the value so that it can always be maintained in a good state.

Characteristic means for this is installed inside the housing, the torsion bar, the input shaft, the hydraulic control valve portion consisting of the valve body, the worm shaft rotatably connected to the torsion bar, the spiral groove and ball nut of the worm shaft In the steering apparatus composed of a hydraulic actuator consisting of a rack piston coupled to the mechanism and a gear box therein, a pinion engaged with the rack portion of the rack piston, and a steering actuator consisting of a sector shaft including the pinion, After the recess is formed at the lower periphery of one pinion, the ball member installed in the spring is installed, and the gear box corresponding to the position of the ball member is provided with a support yoke having a hemispherical groove to which the ball member can contact. .

1 is a cross-sectional view showing a conventional steering stability improving device

Figure 2 is a cross-sectional view showing a steering stability improving device of another conventional embodiment

3 is a cross-sectional view showing the configuration of the present invention

Figure 4 is a side cross-sectional view showing a configuration of the present invention

5 is an enlarged cross-sectional view showing the main configuration of the present invention.

Figure 6 is an enlarged side cross-sectional view showing the main configuration of the present invention.

<Explanation of symbols for main parts of the drawings>

4: support yoke 5: plug

6 ball member 7 spring

41: semicircular groove 42: recess

43: convex part 51: male thread

100: hydraulic control valve 200: hydraulic operation

300: steering operation unit 101: housing

110: torsion bar 120: input shaft

130: valve body 210: worm shaft

211: spiral groove 220: ball nut mechanism

230: Rack Piston 231: Rack

310: sector shaft 311: pinion

312 grooves

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a front sectional view showing a configuration of the present invention, Figure 4 is a side sectional view showing a configuration of the present invention.

As shown in the figure, the present invention is composed of a hydraulic control valve unit 100, a hydraulic operating unit 200, the steering operating unit 300.

The hydraulic control valve unit 100 is installed in the housing 101, but consists of a torsion bar 110, the input shaft 120, the valve body 130, the hydraulic operation unit 200 is The worm shaft 210 is connected to the torsion bar 110 and is rotatable, and the rack piston 230 coupled to the spiral groove 211 and the ball nut mechanism 220 of the worm shaft are made of gear boxes 201. It is assembled inside the interior.

And, the steering operation unit 300 is composed of a pinion 311 engaged to the rack 231 portion of the rack piston and the sector shaft 310 including the pinion, the feature of the present invention is this steering operation It is provided between the pinion 311 of the part 300 and the gear box 201.

That is, after the recess 312 is formed at the lower periphery of the pinion 311, the ball member 6 installed in the spring 7 is installed, and the gear box 201 corresponding to the position of the ball member is provided. ) Is provided with a support yoke 4 having a hemispherical groove 41 in which the ball member 6 can contact, and the support yoke 4 is supported by the plug 5.

At this time, the plug 5 is to form the female screw 202 directly in the gear box 201, so that the hemispherical groove 41 of the support yoke 4 can be adjusted forward, backward toward the pinion 311. It is important that the hemispherical groove 41 of the support yoke 4 has a convex portion 43 at the center thereof so as to increase the required torque value when the ball member 6 is to be out of the neutral position. The recess 42 is formed.

The following describes the operating state of the present invention configured as described above.

As shown in FIG. 1, when the input shaft 120 connected to the handle rotates, the input shaft 120 is transmitted to the worm shaft 210 of the steering gear, and the worm shaft 210 is coupled with the rack pinion 311 as the ball nut mechanism 220. Since the rack pinion 311 is changed to a linear reciprocating motion.

The reciprocating motion of the rack pinion 311 causes the pinion 311 of the sector shaft 310 engaged with the rack 231 to rotate, and thus, the sector shaft 310 rotates to perform steering operation.

At this time, when the handle is turned from the right end to the left end, or from the left end to the right end, the ball member 6, which is installed as a spring 7 in the lower groove 312 of the pinion 311, supports the yoke. When the ball member 6 is rotated as it is mounted on the hemispherical groove 41 of (4), the ball member 6 is formed in the center of the hemispherical groove 41 at the high speed, or the convex portion 43 is formed. In the neutral state, since the torque for turning the handle is increased, it has a stable straightness.

On the other hand, if the wear occurs in the hemispherical groove 41 due to the operation as described above for a long time, the height of the concave portion 42 or the convex portion 43 is lowered to reduce the torque generated in the neutral state, in this case with a screw Tighten the combined plug (5) to increase the height of the support yoke (4).

As the height of the support yoke 4 becomes higher, the rotation torque in the neutral state becomes larger, so that the continuous straight molding is maintained continuously.

In the present invention as described in detail above, the ball member 6 is installed in the pinion 311, and the support yoke 4 with height adjustment is provided as the plug 5 in the gear box 201. The torque in the neutral state can be increased by the concave portion 42 or the convex portion 43 formed in the hemispherical groove 41, and therefore, the driving force can be driven in a stable state due to the good propensity of driving at high speed. However, since the height of the support yoke 4 can be adjusted even if wear occurs in the concave portion or the convex portion over a long period of time, the wear value can be compensated to ensure a stable running condition at all times.

Claims (3)

Is installed inside the housing 101, the torsion bar 110, the input shaft 120, the hydraulic control valve unit 100 consisting of the valve body 130, The gear box 201 is made up of a worm shaft 210 which is connected to the torsion bar 110 and is rotatable, a spiral groove 211 of the worm shaft, and a rack piston 230 coupled to the ball nut mechanism 220. ) The hydraulic operation unit 200 embedded therein, In the steering apparatus consisting of a pinion 311 meshed with the rack 231 portion of the rack piston and a steering operation unit 300 including the sector shaft 310 including the pinion, After the recess 312 is formed at the lower periphery of the pinion 311, the ball member 6 installed in the spring 7 is installed, and the gear box 201 corresponding to the position of the ball member is provided. A support yoke (4) having a hemispherical groove (41) to which the ball member (6) can contact, and a plug (5) for supporting the support yoke is provided and configured. The method according to claim 1, The support yoke 4 is installed in the gear box 201, the plug 5 is formed of a male thread 51, and the gear box 201 is formed of a female thread 202 so that the hemispherical groove 41 is formed. Steering stability improvement apparatus for a vehicle, characterized in that to be adjusted forward, backward toward the pinion (311). The method according to claim 1, The hemispherical groove 41 of the support yoke 4 is characterized in that the convex portion 43 is formed at the center thereof so that the required torque value increases when the ball member 6 is to be out of the neutral position. Vehicle steering stability improving device.