KR19990015815A - Variable steering gear for cars - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable steering gear for an automobile, comprising a rack gear having a pinion at a steering shaft end of a steering wheel and a rack gear connected to a tie rod so as to interlock with the pinion, the teeth 11 from the center toward the outside. (12) (13) and rack (10) integrally provided so that the pitch (P1), (P2), and (P3) is increased, so that a large rotation angle can be obtained at the wheel even at low speed or at low rotation of the steering wheel during parking. The driver's convenience is improved.

Description

Variable steering gear for cars

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable steering gear for automobiles. In particular, the pitch of the rack provided at the center of the tie-end rod is gradually increased from the center to the outside, so that the steering wheel may be rotated even at a low speed or at a low rotation of the steering wheel during parking. Many rotation angles can be obtained to enhance the driver's convenience.

In general, in order to arbitrarily change the traveling direction of the vehicle being driven, a steering apparatus is provided to enable the driving wheel to be moved left and right within a predetermined angle. This steering system reduces the rotation of the steering part and the steering part where the driver directly steers, and increases the maneuvering force and at the same time transmits the movement of the gear part and the gear part to the link mechanism by changing the direction of movement of the operating mechanism to the drive wheel. It is comprised by the link part which maintains the relationship position of right and left wheels correctly.

The operation part is usually provided with a steering wheel, an axle shaft, a column, etc., the gear part is composed of a gear fixed to the frame, and the link part is composed of a pitman, an arm, a drag link, a knuckle arm and a rod.

Gears are of worm sector type, worm sector roller type, rack pinion type and ball nut type, and the worm sector type is used as a combination of worm and fan type gears.

The worm sector roller type has rollers instead of sector gears, and the rack pinion type combines racks and pinions.

The ball nut type is to reduce the frictional resistance between the worm and the nut and has a ball therein.

As shown in FIGS. 1 and 2, the main structure of the rack pinion type includes a pinion 110 at a distal end of the steering shaft 100 and a tie rod 130 having a rack 120 in contact with the pinion 110. In the center of 130a).

An elastic member 140 and a guide member 150 are provided at the lower end of the rack 120 to allow the rack 120 and the pinion 110 to be coupled with an appropriate friction force.

As the driver rotates the steering wheel, the steering shaft 100 provided at the center thereof is interlocked, and the pinion 110 provided at the end of the steering shaft 100 rotates.

As the rack 120 engaged by the rotation of the pinion 110 is moved left and right, the drive wheel is bent by moving the tie rods 130 and 130a provided at both ends thereof.

However, if the driver wants to change the direction of the driving wheel by rotating the steering wheel, the pinion of the steering shaft has the same pitch as the rack, so the steering wheel must be rotated several times during low-speed driving or parking. There was a hassle.

In addition, the high-speed driving should have a small change in the angle of the drive wheel, but the pitch is uniformly fixed, which causes the change of the angle of the drive wheel to increase even with a small amount of steering.

The present invention has been made in order to solve the above problems to provide a variable steering gear for a vehicle having a rack for increasing the pitch toward the outside to obtain a large number of rotation angles with a low rotation of the wheel during low speed or parking. have.

1 is a perspective illustration showing a rack pinion type steering apparatus according to the conventional design,

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

3 is a perspective illustration of the present invention;

4 is a longitudinal cross-sectional view of the present invention.

* Description of the symbols for the main parts of the drawings *

10; rack

11,12,13;

P1, P2, P3; Pitch

The present invention to achieve this is to increase the screw thread and its pitch from the center toward the outside to have a rack formed integrally to improve the convenience of the driver when changing the direction.

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

Figure 3 is a perspective illustration of the present invention, Figure 4 is a longitudinal cross-sectional view of the present invention.

In a steering gear having a pinion at the distal end of the steering shaft and a rack in contact with the pinion at the center of the tie rod, and having an elastic member and a guide member at the lower end of the rack, as a circumferential surface fixed to the distal end of the steering shaft. It has a plurality of teeth (gear teeth) integrally formed with a pinion, which is formed in this pinion is a common tooth form, the root is formed to be wider than the end of the tooth, the center portion is curved toward the end Formed.

That is, the width of the root is wider than the width of the tip, and it has an inverted triangle structure.

And, the rack 10 is connected to the pinion is connected to the tie lot at both ends and provided with a plurality of teeth on one side, which is coupled to this formed on the pinion gear teeth 11 toward the outside from the center (both sides) (12) It consists of the rack 10 provided integrally so that the magnitude | size of pitch (13) and pitch (P1) (P2) (P3) may become large.

When the gear teeth 11 of the rack 10 are coupled to the middle of the initial (center of the tie rod) pinion, the gear teeth 11 are connected to the ends of the pinion teeth, and the contact depth is deepened as the pinion rotates. It is.

In the present invention, the center of the pinion and the center of the rack can always maintain the same distance.

The operation of the present invention configured as described above is as follows.

At the same time the steering wheel is rotated to drive or drive, the rotational force is to rotate the pinion 110 provided at the end through the steering shaft (100).

Initially, as the tooth pinion 110 of the rack 10 inserted into the tip end of the pinion 110 rotates, the depth of the bite increases, so that the movement of the rack 10 increases.

As the rack moves, the tie rods 130 and 130a fixed at both ends of the rack move a lot, and the rotation angle of the driving wheel increases.

In addition, since the pinion 110 is positioned at the center of the rack 10 during the high-speed driving, even if the steering wheel is rotated at a predetermined angle, the angle of the driving wheel is hardly changed, so that the straight driving can be performed.

As described above, the present invention includes a rack that has a larger pitch toward the outside and has a larger angle displacement at a low speed compared to the rotation angle of the steering wheel, and a small displacement at a high speed, thereby improving driver convenience. It could be promoted.

Claims (1)

A steering gear having a pinion at a steering shaft end of a steering wheel and a rack gear connected to a tie rod to interlock with the pinion, wherein the teeth (11) (12) (13) and the pitch (P1) are moved from the center to the outside. (P2) (P3) variable steering gear for automobiles, characterized in that consisting of a rack 10 is provided integrally.