JPS5839566A - Steering device - Google Patents

Abstract

PURPOSE:To increase the rigidity and to improve the efficacy of a steering wheel by connecting a ball nut to a center link. CONSTITUTION:When a steering wheel 2 is rotated to the right, a worm 8 is rotated to the left and a ball nut 9 is moved to the right, thereby a center link 10 is moved to the right and the front ends of both wheels 12 are turned on the right. Likewise, when the steering wheel 2 is rotated to the left, both wheels 12 are turned to the left. The movement of the ball nut 9 to the right or left direction caused by the rotation of the worm 8 is directly transmitted to the center link 10, therefore, no turning lag of both wheels 12 or no difference between the steering angle ratio and its set value occurs. In addition, a kickback shimmy is prevented from occurring because a combination of the worm 8 and the ball nut 9 is used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering device for an automobile.

Conventionally, as an example of a steering device, there is a so-called recirculating ball that incorporates a circulating ball between a ohm that rotates when the steering wheel is rotated and a nand that meshes with a sector shaft, and a pintoman arm that is connected to the sector shaft. There is something called a formula. This type of device has the advantage of low friction, but because it uses many deformable parts such as the sector shaft and pitman arm, the movement of the wheels relative to the rotation of the steering wheel is slow, and the wheels do not move as desired. In some cases, the steering wheel does not rotate to an angle of 1, and there is a problem that the steering wheel does not have good sharpness. On the other hand, rack-and-pinion steering devices transmit the rotation of the steering wheel directly from the pinio/pinion to the rack to steer and control the wheels, so the steering wheel has good sharpness, but on the other hand, it is difficult to steer from the wheels. Since the transmission of force to the wheel is also improved, there is a problem in that kickback or shimmy is likely to occur.

In view of this, the present invention provides a recirculation/group ball type device in which the sector shaft and pitman arm are eliminated, and a ball nut is directly connected to a center link provided in the left-right direction of the vehicle, and the ball nut is connected to the center link via a tie rod. The present invention provides a complete steering device that has excellent steering operability by connecting side wheels, and suppresses the occurrence of kickback and shimmy.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

Reference numeral 1 designates a steering device for an automobile, in which a steering wheel 2 is connected to a worm 8 via a steering shaft 5, reduction gears 4, 5, a connecting shaft 6, and an inner shell shaft 7, and the worm 8 is connected to a center link via a ball nut 9. 10, and side wheels 12.12 are connected to both ends of the center link 10 via tie rods 11.11.

The worm, the worm 8, the ball nut 9, and the center link 10 are assembled in a box 14, and the worm 8 and the center link 10 are arranged parallel to each other in the left-right direction of the vehicle. are engaged with each other via a ball 15, and the ball nut 9 is fixed to the center link 10 with a bracket 16. Then,
The worm 8 is attached to the mounting plate 17.1 attached to the box 14.
8 via a bearing, and its base end protruding from the box 14 is connected to the intermediate shaft 7 by a universal joint 19.

In addition, the center link 10 has both ends protruding beyond the box 14, and the middle part having bushings 20.2 provided at both ends of the box.
0 in a slidable manner.

In addition, in FIG. 1, 21 is a universal joint that connects the connecting shaft 6 and the intermediate shaft 7, and in FIG. 2, 22 is a passage for the circulating balls 15.

In the above structure, when the steering wheel 2 is rotated to the right, the worm 8 is rotated to the left and the pole nut 9 is moved to the right, so that the center link 10 is moved to the right, and the front end of the side wheels 12.12 is turned to the right. Rotate to. Conversely, when the steering wheel 2f is rotated to the left, both wheels 12.degree. In this way, the left-right movement of the pole nut 9 caused by the rotation of the worm 8 is directly transmitted to the centering 10, so that the movement of the pole nut 9 in the left-right direction due to the rotation of the worm 8 is directly transmitted to the centering 10. Delay in rotation of side wheels 12.12, steering wheel 2
The ratio of the rotation angle of the side wheels 12.12 to the rotation angle of the side wheels 12.12, ie, the steering angle ratio, does not deviate from the set value. Further, since it is a combination of the worm 8 and the ball nand 9, the transmission of force from the side wheels 12, 12 to the steer and ring wheels 2 is suppressed, and kickback and shimmy are prevented from occurring.

As described above, according to the present invention, the pole nut is directly connected to the center link, thereby eliminating the conventional sector shaft and pitman arm.

Because the stiffness of the entire steering system increases,
Improved power transmission from the steering wheel to the side wheels,
In addition to improving the sharpness of the steering wheel,
The excellent effect of suppressing the occurrence of kickback and shimmy can be obtained.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, with FIG. 1 being a schematic plan view showing the overall configuration of a steering device, and FIG. 2 being a central longitudinal sectional view of the main parts.

Claims (1)

[Claims] (+) A worm that rotates when the steering wheel is rotated is placed in the left and right direction of the vehicle, and a pole nut is engaged with the worm through a pole, and the pole nut is engaged with the worm through the pole.
? The worm is fixed to a center link that is slidable in the left-right direction of the vehicle, and a side wheel is connected to the center link via a tie rod, and the worm is rotated by rotating the steering wheel. A steering device characterized by moving a center link left and right by moving it left and right.