JPH10217986A - Mounting structure for steering gear box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance mounting ridity and strengthen the structure sufficiently against force applied in the car width direction. SOLUTION: This mounting structure is so constituted that a mounting part located between paired flanges provided for the steering gear box is mounted to the mounting part of the steering gear box provided for the side of a car body with a mounting bracket. In this case, one side of paired flange parts 19 and 19 is enlarged so as to be formed so as to be piled up to the side surfaces 15b at both the sides of the mounting part 15 for the steering gear box 1 provided for the car body side, and the one side is so designed as to receive force in the car width direction by paired the flange parts 19 and 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a rack and pinion type steering gear box used in a four-wheeled vehicle.

[0002]

2. Description of the Related Art As is well known, in a four-wheeled vehicle, FIG.
As shown in the figure, the operation from the steering wheel 100 includes a steering shaft 101, a steering shaft joint 102, and a steering gear box 103.
The steering force is transmitted to the left and right wheels 104 via the. As shown in FIG. 14, the steering gear box 103 has a rack 105 and a pinion 106 built therein.
The rotation of the steering shaft 101 is controlled by the left and right wheels 10.
4 is transmitted to the tie rod 107 for steering.

As shown in FIG. 15, a housing 108 of the steering gear box 103 is provided with a rack housing 109 and a pinion housing 110. The rack housing 109 has a built-in rack 105, and the pinion housing 110 has a pinion 106. Built-in. Boots 111 are provided at both ends of the steering gear box 103 to cover the connection between the rack 105 and the tie rod 107. Tie rod 10
A tie rod end 112 is attached to the end of the rim 7 and is connected to a steering knuckle 113. On the other end of the rack housing 109, a rack bush 114 and a rack side mount 115 are mounted.

Conventionally, a steering gear box 103
Are mounted on the vehicle body via both ends of a rack housing 109 via a steering gear bracket 116 as a mounting bracket. The steering gear bracket 116 is connected to the pinion 10 of the rack housing 109.
It comprises a pinion side bracket 117 supporting the 6 side and a rack side bracket 118 supporting the rack 105 side.

On the other hand, a mounting portion for the steering gear box 103 is provided on the vehicle body side, and the steering gear box 103 is mounted on this mounting portion via a pinion side bracket 117 and a rack side bracket 118. In the rack housing 109,
A pair of flange portions 119 is provided on the pinion housing 110 side.
Are provided at regular intervals, and a portion between the flange portions 119 is fixed to the vehicle body by a pinion side bracket 117. Thus, the lateral force transmitted from the tire to the steering gear box 103 during traveling is received by the steering gear bracket 116 and the flange portion 119.

[0006]

As described above, in the prior art, since the size of the flange portion 119 is small, the area of the flange portion 119 overlapping the side surface of the mounting portion on the vehicle body side is small. On the other hand, sufficient strength could not be maintained. Therefore, conventionally, the size of the mounting bracket such as the steering gear bracket 116 has been increased. However, since there is no space in a mini car and a small car, it is impossible to increase the size of the mounting bracket, so that the rigidity becomes insufficient.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a mounting structure of a steering gear box capable of improving mounting rigidity and obtaining sufficient strength against a force in a vehicle width direction.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a mounting portion between a pair of flange portions provided on a steering gear box is attached to a mounting portion of a steering gear box provided on a vehicle body side. In a mounting structure for a steering gear box mounted by a mounting bracket, one side of a pair of flange portions provided on the steering gear box overlaps side surfaces on both sides of a mounting portion of a steering gear box provided on the vehicle body side. It was formed in an enlarged manner. Further, the present invention resides in that one side of the pair of flange portions is enlarged in a trapezoidal shape.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view showing a part of a mounting structure of a steering gear box according to the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line AA showing the state where the steering gear box of FIG. 1 is attached to the vehicle body, and FIG. 3 is a cross-sectional view taken along the line BB showing the state where the steering gear box of FIG.

1 to 3, reference numeral 1 denotes a pinion 2
And a steering gear box incorporating a rack 3. In the steering gear box 1, a housing 6 includes a pinion housing 4 having a pinion 2 built therein and a rack housing 5 having a rack 3 built therein. A steering force is transmitted to the pinion 2 from a steering shaft, and rotation is transmitted from the pinion 2 to the rack 3 so that the rack 3 linearly moves left and right. At both ends of the rack 3, tie rods 7 are ball joints 8
A tie rod end 9 for steering a knuckle arm of a wheel (not shown) is attached to the tip of the tie rod 7. A boot 10 is mounted on the ball joint 8 to cover the connection portion.

The steering gear box 1 includes mounting portions 11 and 12 provided at both ends of a rack housing 5.
Are fixed to mounting parts 15 and 16 on the vehicle body side by bolts 17 and 18 via pinion side brackets 13 and rack side brackets 14 as mounting brackets. Nuts 17a, 18a are previously attached to the mounting portions 15, 16 on the vehicle body side by welding or the like on the back side of the mounting holes (not shown). Box 1 is fixed. Mounting parts 15 and 16 on the vehicle body side
Are formed so as to protrude from the vehicle body surface so that the steering gear box 1 does not contact the vehicle body. The mounting portions 15 and 16 may be formed on the vehicle body itself, or may be formed by bolting or welding a mounting member such as a bracket provided with the mounting portions 15 and 16 to the vehicle body.

The housing 6 of the steering gear box 1 will be described with reference to FIGS. The pinion housing 4 is provided at one end of the housing 6, and the pinion housing 4 communicates with the inside thereof and is provided in a direction in which the rack housings 5 intersect. At both ends of the rack housing 5, mounting portions 11, 12 for mounting to the vehicle body are provided (see FIG. 4). A pair of flange portions 19, 19 facing each other is provided on both sides of the mounting portion 11 for the pinion side bracket 13 at one end of the rack housing 5 (see FIG. 5). It supports both sides of the mounting portion 15 on the vehicle body side. The flange portions 19 are provided on both sides 15 of the mounting portion 15 on the vehicle body side.
One side portion is formed in a substantially trapezoidal shape so as to overlap with b (see FIG. 9).

On the other hand, the mounting portions 15 and 16 on the vehicle body are formed so as to protrude in correspondence with the mounting portions 11 and 12 of the rack housing 5 of the steering gear box 1. Concave portions 15a and 16a for holding the mounting portions 11 and 12 of the rack housing 5 in cooperation with the pinion side bracket 13 and the rack side bracket 14 are formed in an intermediate portion.
reference). The recesses 15a and 16a are
May be formed according to the shape of the mounting portions 11 and 12, and may be circular, square, or trapezoidal. Flange part 1
As shown in FIG. 10, 9 and 19 are mounting portions 15 on the vehicle body side.
Are provided to support the side surfaces 15b on both sides of the projecting portion.

According to the above configuration, when the steering gear box 1 is mounted, the pinion side brackets 13 are attached to the mounting portions 11 and 12 at both ends of the rack housing 5.
And the rack side bracket 14. And
The steering gear box 1 is attached to the vehicle body mounting portion 15,
The steering gear box 1 is fixed by bolting the pinion side bracket 13 and the rack side bracket 14 to the mounting portions 15 and 16 on the vehicle body via bolts 17 and 18 and nuts 17a and 18a. You. At the time of assembling, as shown in FIG. 11, the pinion side bracket 13 and the rack side bracket 14 may be assembled after the steering gear box 1 is arranged on the mounting portions 15 and 16 on the vehicle body side. At this time, since the pair of flange portions 19, 19 are arranged on the entire side surface 15b of the mounting portion 15 on the vehicle body side, the movement of the steering gear box 1 in the vehicle body width direction can be restricted. The steering gear box 1 includes a pinion side bracket 13, a rack side bracket 14, and recesses 15a, 16 of mounting portions 15, 16 on the vehicle body side.
Since the mounting portions 11 and 12 of the rack housing 5 can be gripped by a, the steering gear box 1
Can be restricted in the vertical direction.

In the above embodiment, the mounting portion 1 on the vehicle body side is used.
Although the parts 5 and 16 have been described as a part of the vehicle body, another mounting member such as a bracket is fixed to the vehicle body by welding or bolting or the like, and this mounting member is connected to the pinion side bracket 13 and the rack side bracket 14. And the steering gear box 1 may be fixed. FIG.
This shows a modification in this case, and shows the structure of the mounting portion 11 side. In this case, another bracket 20 is attached to the vehicle body by bolting or the like.
And the pinion side bracket 13 is combined and fixed with bolts 21 and nuts 21a. Thus,
The side surface of the bracket 20 is locked by a pair of flange portions 19, 19. If a recess similar to the recess 15a is formed in the bracket 20, positioning in the vertical direction can be performed. The size of the bracket 20 can be appropriately selected and used. Further, if a pinion side mount made of rubber or the like is interposed between the pinion side bracket 13 and the mounting portion 11 of the rack housing 5, the pinion side bracket 13 can be more securely tightened. Means for fixing the pinion side bracket 13 and the like are not limited to bolts, but may be screws or other fasteners.

[0017]

As described above, according to the mounting structure of the steering gear box according to the present invention, the following effects can be obtained. The steering gear box mounting structure according to claim 1, wherein a mounting portion between the pair of flange portions provided on the steering gear box is mounted to a mounting portion of the steering gear box provided on the vehicle body by a mounting bracket. At
One side of the pair of flange portions provided on the steering gear box is formed so as to be enlarged so as to overlap the side surfaces on both sides of the mounting portion of the steering gear box provided on the vehicle body side. Since it can be enlarged, it is possible to improve the mounting rigidity and obtain sufficient strength against a force in the width direction of the vehicle body. Therefore, since the mounting rigidity can be improved, it is possible to maintain the strength required for a small car while maintaining the mounting space comparable to that of a mini vehicle. The mounting rigidity in the existing layout can be improved. In claim 2, since one side of the pair of flange portions is enlarged in a trapezoidal shape,
The portion overlapping the side surfaces on both sides of the mounting portion of the steering gear box provided on the vehicle body side is enlarged, and sufficient rigidity can be obtained against a force in the vehicle body width direction.

[Brief description of the drawings]

FIG. 1 is a front view partially showing a cross section of an embodiment of a mounting structure for a steering gear box according to the present invention.

FIG. 2 is a cross-sectional view taken along line AA of the state in which the steering gear box of FIG. 1 is attached to a vehicle body.

FIG. 3 is a cross-sectional view taken along the line BB showing a state in which the steering gear box of FIG. 1 is attached to a vehicle body.

FIG. 4 is a front view showing a housing of the steering gear box of FIG. 1;

5 is an enlarged front view showing a part of FIG. 4;

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a perspective view in the direction of arrow A in FIG.

8 is a perspective view in the direction of arrow B in FIG. 5;

FIG. 9 is a sectional view taken along line BB of FIG. 5;

FIG. 10 is a conceptual sectional view showing a state where a steering gear box is attached.

FIG. 11 is a conceptual sectional view showing a procedure for attaching a steering gear box.

FIG. 12 is a conceptual sectional view showing a modified example of the mounting structure of the steering gear box according to the present invention.

FIG. 13 is a perspective view showing a conventional steering gear box mounting structure.

FIG. 14 is a conceptual perspective view showing a pinion and a rack of a conventional steering gear box.

FIG. 15 is an exploded perspective view showing a conventional steering gear box mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steering gear box 2 Pinion 3 Rack 4 Pinion housing 5 Rack housing 6 Housing 11 Rack housing mounting part 12 Rack housing mounting part 13 Pinion side bracket (mounting bracket) 14 Rack side bracket 15 Vehicle side mounting part 16 Vehicle side Mounting part 19 Flange part 20 Bracket

Claims (2)

[Claims] 1. A steering gear box mounting structure in which a mounting portion between a pair of flange portions provided on a steering gear box is mounted on a mounting portion of a steering gear box provided on a vehicle body by a mounting bracket. A steering gear, wherein one side of a pair of flange portions provided on the steering gear box is formed so as to be enlarged so as to overlap side surfaces on both sides of a mounting portion of the steering gear box provided on the vehicle body side. Box mounting structure. 2. The steering gear box mounting structure according to claim 1, wherein one side of said pair of flange portions is enlarged in a trapezoidal shape.