JPH0650279Y2 - Steering gear box mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is an improvement of a structure for mounting a gear box in a rack and pinion type steering device to a subframe (also referred to as a suspension member) to which a suspension arm is assembled. It is about.

[Prior Art] Conventionally, as a mounting structure of a steering gear box, for example, one disclosed in Japanese Utility Model Laid-Open No. 63-4874 is known.

In addition, in such a steering gear box mounting structure, a U-shaped braided band is fitted into the groove formed on the outer periphery of the gear box, and the band is fastened to the sub-frame by bolts, so that the sub-frame is attached to the sub-frame. On the other hand, a gear box is attached.

Further, conventionally, as shown in FIG. 3, the sub-frame 1 attached to the body of the vehicle has two longitudinal frame portions 2, 3 in the front-rear direction.
When the left and right horizontal frame portions 4 and 5 are formed into a substantially quadrilateral shape, the left and right support members 25 are provided between the horizontal frames 4 and 5. Then, by tightening the tightening bands 26 respectively fitted in the grooves formed at both ends of the gear box 10 to the both supporting members 25 by the bolts 27,
There is a structure in which the gear box 10 can be attached.

Further, as shown in FIG. 4, of the two lateral frame portions 4 and 5 of the sub-frame 1, the gear box 10 is attached to the brackets 11 and 12 provided on the left and right portions of one lateral frame portion 4, respectively.
There is also a structure in which the gear box 10 is mounted by connecting the mounting pieces 14 and 15 projecting from both ends of the with a bolt 17.

[Problems to be Solved by the Invention] By the way, in the conventional device shown in FIG. 3, the number of parts is large, the structure is complicated, and the gear box 10 effectively contributes to the improvement of the planar rigidity of the sub-frame 1. I can't. Therefore, the sub-frame 1 is easily deformed by the load input from the suspension arm 7 and the strut bar 8.

Further, in the conventional structure shown in FIG. 4, although the structure is simple, the contribution of the gear box 10 to the plane rigidity of the sub-frame 1 is small and the suspension arm 7
The deformation of the subframe 1 due to the load input from the or strut bar 8 tends to increase.

Further, the deformation of the sub-frame 1 causes problems such as deterioration of straightness and steering stability of the vehicle, generation of vibration and noise, deterioration of riding comfort, and the like.

In view of the conventional problems described above, an object of the present invention is to provide a mounting structure for a steering gear box that can effectively increase the plane rigidity of the subframe by the gear box without increasing the number of parts. .

[Means for Solving the Problems] In the steering gear box mounting structure of the present invention, the planar rigidity of the sub-frame is improved by mounting the gear box to both lateral frame parts of the sub-frame in a state of being connected at three points. It effectively enhances.

Specifically, in the sub-frame which is formed into a substantially quadrilateral shape by both longitudinal frame parts in the front-rear direction and both lateral frame parts in the left-right direction, and to which the steering gear box, suspension arms, etc. are attached, The left and right parts of the gear box are respectively coupled to one of the lateral frame parts. Particularly, the substantially central portion of the gear box is coupled to the other lateral frame portion.

[Operation] According to the above-described steering gear box mounting structure, the gear box acts as a member forming a substantially triangular truss structure with respect to the subframe, so that the planar rigidity of the subframe is effectively increased.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Fig. 1 which shows the mounting structure of the steering gear box from a plan view, the sub-frame 1 has both vertical frame portions 2 and 3 in the front-rear direction with a predetermined space left and right, and both ends of these vertical frame portions 2 and 3, It is formed in a substantially quadrilateral shape by the left and right lateral frame portions 4 and 5 which are connected to each other and have a predetermined distance in the front and rear. The sub-frame 1 is assembled to the vehicle body (not shown) by a mounting mechanism 6 having elasticity such as a rubber bush at the front and rear portions of the vertical frame portions 2 and 3, that is, a total of four locations.

In addition, a suspension arm (lower arm) is provided at a substantially central portion in the front-rear direction on the lower surfaces of both vertical frame portions 2 and 3 of the subframe 1.
7 are supported at their bases so as to be swingable in the vertical direction. Further, the other end of the strut bar 8 having one end coupled to each suspension arm 7 is coupled to the rear end portions of the vertical frame portions 2 and 3, respectively.

The gearbox 10 of the rack and pinion type steering is attached to the subframe 1 at an intermediate position between both lateral frame portions 4 and 5 of the subframe 1. That is, in this embodiment, both horizontal frame portions 4 and 5 before and after the sub-frame 1
Of these, the horizontal frame portion 4 on the front side (upper side in FIG. 1)
First and second brackets 11 and 12 project toward the rear lateral frame portion 5 at both left and right end portions of the. Further, a third bracket 13 projects toward the front lateral frame portion 4 at the center of the rear lateral frame portion 5.

On the front side of both left and right ends of the gear box 10, the first and second
First and second mounting pieces 14 and 15 corresponding to brackets 11 and 12 of
Is projected. A third mounting piece 16 that reacts with the third bracket 13 is provided on the rear side of the central portion of the gear box 10.
Is projected. Then, as shown in FIG. 2, the first, second and third brackets 11, 12, 13 and the first, second and third mounting pieces 14, 15, 16 respectively include a bolt 17 and a nut.
The gear box 10 can be attached to the sub-frame 1 by being rigidly coupled by 18. Further, as shown in FIG. 2, the shaft portion of the bolt 17 is
The collar 30 is fitted and inserted between the pair of mounting pieces 13 (14, 15).

As is well known, the gear housing of the gear box 10
A pinion shaft 19 through which the operating force of the steering wheel is transmitted via a steering shaft (not shown) is provided inside 10a, and a rack bar (not shown) that meshes with the pinion shaft 19 is provided in the gear box 10 to the left and right. The interior is slidable. A tie rod 21 is connected to both ends of the rack bar by an intermediate rod 20, and a tip end portion of the tie rod 21 is connected to a knuckle arm 22. The knuckle arm 22 is connected to the tip of the suspension arm 7 by a ball joint.

This embodiment is constructed as described above. Therefore, the load input to the sub-frame 1 from the suspension arm 7 and the strut bar 8 is applied to the first to third brackets 11, 12 and 13 and the first to third brackets from both lateral frame portions 4,5 of the sub-frame 1. Gear box 10 through each mounting piece 14, 15, 16 of 3
Be transmitted to. The gear box 10 functions as a member forming a substantially triangular truss structure with respect to the subframe 1.

As described above, the plane rigidity of the subframe 1 is effectively increased by the gear box 10, so that the deformation of the subframe 1 is reduced even when the load input from the suspension arm 7 or the strut bar 8 is large.

In the above embodiment, the first to first subframes 1 to
Each of the third brackets 11, 12, 13 and the first of the gear box 10
Although the third mounting pieces 14, 15 and 16 are rigidly connected to each other by the bolt 17 and the nut 18, a rubber bush may be interposed around the axis of the bolt 17 if necessary.

[Advantages of the Invention] As described above, according to the steering gear box mounting structure of the present invention, the plane rigidity of the subframe can be effectively increased by the gearbox without increasing the number of parts. Greatly effective in improving straightness, steering stability and riding comfort.

[Brief description of drawings]

1 and 2 of the drawings show an embodiment of the present invention. FIG. 1 is a plan view showing a mounting structure of a steering gear box, and FIG. 2 shows a connecting portion between a sub frame and a gear box. It is sectional drawing shown. 3 and 4 are plan views showing a conventional steering gear box mounting structure, respectively. 1 …… Subframe 2,3 …… Vertical frame section 4,5 …… Horizontal frame section 10 …… Gear box 11 to 13 …… First to third brackets 14 to 16 …… First to third mounting Piece 17 …… Bolt

Claims (1)

[Scope of utility model registration request] Claims: 1. A sub-frame which is substantially quadrilateral composed of front and rear vertical frame parts and left and right horizontal frame parts, and to which a steering gear box, suspension arm and the like are attached. A steering gear box mounting structure in which the left and right parts of the gear box are respectively coupled to one of the lateral frame portions, and the substantially central portion of the gear box is coupled to the other lateral frame portion.