JPH0423738Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rack and pinion mounting structure for attaching a rack shaft housing housing a rack meshing with a pinion in a steering device to a body side member.

[Prior Art] Conventionally, in this type of rack and pinion mounting structure, a rack shaft housing that accommodates a rack that engages with a pinion in a steering device is attached to a body side member at two locations.

An example of this will be explained with reference to FIG. 3A and FIG. 3B, which is a sectional view taken along line A--A in FIG. 3A. As shown in FIG. 3A, the rack shaft housing 21 is attached to two mount portions 27 on the left and right, that is, two mount portions 27 made of cast metal or the like. Left and right brackets 25,
26 is attached to the rack shaft housing 21, and as shown in FIG. A rubber 22 is interposed between the rack shaft housing 21 and the brackets 25 and 26. Further, a cylindrical housing 29 is arranged between the left and right mount parts 27.

Further, a mount structure as shown in FIG. 4 is also disclosed. This rack shaft housing 31
For the mounting structure of the rack shaft 38
Rack gear housing 33 that slidably supports the
A mounting insulator 32 having flanges 37 formed at both ends is formed on the outer periphery of the rack gear housing 33 between these flanges, and the flanges are placed inside the flanges of the rack gear housing 33. Position and install this mounting insulator 3.
A clamp 35 is held between the two flanges 37 from the outer peripheral side, and this clamp 35 is fixed to a member 34 on the vehicle body side.

[Problem that the invention attempts to solve]

However, in the rack and pinion mounting structure shown in FIG. 3A and FIG. 25 and 26, the mounting positions of the left and right mounts 27 of the rack shaft housing 21, and the body side member 2.
4, it is necessary to achieve extremely high precision, for example, within ±0.1 mm, which requires machining and significantly increases manufacturing costs.

For this reason, the mount structure shown in Figure 3 A and B is not used, and only one bracket of the mount structure receives axial input, while the other bracket simply controls the longitudinal and vertical positions of the rack shaft housing. There are some products that are used that regulate the

This will be explained with reference to FIG. 5. The rack shaft housing 41 includes a mount portion 42 integral with a rack gear housing 47, a cylindrical housing 48, and a mount portion 43. The cylindrical housing 48 is fixed to the mount portion 48. Further, the mount portion 43 is connected to the cylindrical housing 4
8 in a slip-fitting state. The rack shaft housing 41 is attached to the vehicle body by simply interposing a rubber or the like to the mount portion 43. However, the rack shaft housing 4
It is not installed so as to restrict the axial movement of 1. However, in such a mount structure, since all the input to the rack shaft housing 41 is concentrated on the bracket on the mount portion 42 on one side, the elastic deformation of the bracket, etc. on the mount portion 42 is doubled, which reduces the steering rigidity. It is causing a decline in

The mount structure shown in FIG. 4 is also similar to that shown in FIG.
The rack shaft housing 31 is provided with a fixed mount portion only on one side, and has similar problems.

The purpose of this invention was to solve the above problem, and even though a fixed mount was provided at only one location on the rack shaft housing when attaching the rack shaft housing to the body side member, It has a structure that performs the same function as a mount structure that has fixed mounts in two locations, and has sufficient mounting strength without requiring high-precision machining of the structure of the left and right mounts. An object of the present invention is to provide a mounting structure for a rack and pinion in a steering device.

[Means for solving problems]

This invention is constructed as follows in order to solve the conventional problems and achieve the above object. That is, this invention forms two mounting portions on the rack shaft housing, attaches the rack shaft housing to the body side member at two locations with brackets, and fixes the brackets with a connecting bar. A steering device characterized in that at least one of the attachment holes provided in the connecting bar is formed into a long hole, and at least one mount portion of the rack shaft housing is fixed integrally with the rack shaft housing. Regarding the rack and pinion mounting structure, the connecting bar can also be constructed from a truss-type member, and is used in a steering device configured to move in a square quadrilateral shape with respect to the mounting surface to increase rigidity. This relates to the rack and pinion mounting structure.

[Effect]

This invention constructed as described above operates as follows. 2 on the rackshaft housing
At least one of the rackshaft housings is formed with a mount portion integral with the rackshaft housing and having flanges at both ends. Furthermore, the two brackets are connected by a connecting bar and the distance between the brackets is kept constant, so even if the input F from, for example, the handle shaft is first applied to one bracket, the brackets will still be connected. Therefore, half the force of F/2 will be applied. Therefore, although it is a mount type in which only one side is fixed to the rack shaft housing, it can perform the same function as a mount type in which both sides are fixed. In addition, at least one of the mounting holes formed in the connecting bar for attaching the connecting bar to the bracket is formed in the shape of a long hole, so in order to attach the bracket to the rack shaft housing, it is necessary to There is no need to set the position with high precision. Furthermore, if the connecting bar is constructed in the form of a truss, it can be constructed to have a parallelogram-like movement with respect to the mounting surface and to have the function of increasing stiffness against tension and compression.

〔Example〕

Hereinafter, embodiments of a rack and pinion mounting structure in a steering device according to this invention will be described in detail with reference to the drawings. Note that left and right in the following description indicate positions on the drawings.

FIG. 1 shows a rack and pinion type mounting structure for a steering device according to this invention. A rack provided on the rack shaft is adapted to mesh with a pinion provided at the tip of the handle shaft (not shown). Rack and pinion are rack and pinion housing 17
is housed within. The rack shaft housing 1 is composed of three members as shown in FIG. Referring to FIG. 1, the rack shaft housing 1 includes a cylindrical housing 2.
8. It consists of a left mount part 2 and a right mount part 3 which are integrally constructed with the rack and pinion housing 17. In this embodiment, the right mount portion 3 is fitted into the cylindrical housing 28 in a sliding manner. The left mount portion 2 is made of cast metal or the like, and has a pair of flanges 13 between which a rubber 30 is fitted. The right mount part 3 has flanges 12 at both ends, and a rubber 30 is fitted between them. Studs 8 are attached to the brackets 4 and 5 by welding or the like, and attachment holes 11 are formed. The connecting bar 6 has attachment holes at both ends, and the attachment hole 9 on the left side is a circular hole, while the attachment hole 10 on the right side is elongated.

The mounting structure for the rack and pinion in a steering device made of such components is assembled as follows. This rack shaft housing 1 is attached to a body side member similar to the body side member 24 or 34 shown in FIG. 3B or FIG. 4. First, install the rack shaft housing 1 at a predetermined position relative to the body side member, fit the left bracket 4 between the flange 13 of the left mount part 2, and insert the bolt through the mounting hole 11 to attach it to the body. At the same time, the right bracket 5 is fitted between the flanges of the right mount portion 3, and the bolts are passed through the mounting holes 11 to be fixed to the body side member.
Next, the mounting holes 9, 10 of the connecting bar 6 are passed through the studs 8 of the bracket, and the connecting bar 6 is fixed to the brackets 4, 5 with nuts 7. In this case, since the mounting hole 10 on the right side is formed as a long hole, the connection bar 6 can be easily mounted by absorbing the tolerance of the distance between the left and right mount parts.

In FIG. 2, another embodiment of the connecting bar for use in the rack and pinion mounting structure according to the invention is shown. This connecting bar 16 is configured in a truss type. Namely. Bracket 4,
It consists of a connecting bar member 16 similar to the above-mentioned connecting bar 6 corresponding to the stud 8 of No. 5, and a connecting bar member 16A corresponding to the mounting holes 11 of the brackets 14 and 15 equipped with the studs 18. is constructed so that it can move in a square quadrilateral pattern. The mounting hole 19 is a circular hole, and the mounting hole 2
0 is formed into a long hole. These connecting bar members 16, 16A constitute a truss-type connecting bar, and have greater rigidity against tension and compression than the rod-like members of the above embodiment.

[Effect of idea]

As described above, the rack and pinion mount structure according to this invention is constructed, and since both brackets are connected by a connecting bar, it is necessary to process and manufacture the setting positions of the left and right mount parts with high precision. do not have. However, the mount portion on the right side (in FIG. 1) is simply fitted in a sliding manner to the rack shaft housing and is movable in the longitudinal direction. However, both brackets are connected by a connecting bar, and the bracket itself is fixed to a member on the body side. Therefore, the input coming from the steering wheel shaft etc. is distributed to the left and right mounts, the elastic deformation of the bracket is halved, and the steering rigidity is doubled. Therefore, the left and right mounts have the same function as if they were fixed to the rack shaft housing. Moreover, since at least one of the mounting holes of the connecting bar is formed as a long hole, the tolerance of the span between the left and right mount parts is absorbed, and precision in mounting the connecting bar on the bracket is not required. Therefore, the rack and pinion mount structure according to this invention can obtain high rigidity equivalent to a mount type that fixes both sides, and because it is a one-sided type, high precision is not required. 0.1
The accuracy of this device is ±2 mm, whereas the accuracy of this device is ±2 mm.
It is sufficient to have a thickness of about 3 mm, and only one mount part is formed of casting or the like, so that it can be manufactured at low cost. Further, if a large rigidity is required for the connecting bar, a truss-type connecting bar as disclosed in another embodiment may be used.

[Brief explanation of the drawing]

Fig. 1 is a partially exploded perspective view showing an embodiment of the rack and pinion mounting structure in the steering device according to this invention, and Fig. 2 shows the connection bar and bracket used in the rack and pinion mounting structure according to this invention. A perspective view showing another embodiment showing the relationship, FIG. 3A is a cross-sectional view of the main part of the rack and pinion mounting structure in a conventional steering device, and FIG. 3B is a line A-- in FIG. 3A.
A sectional view at A, FIG. 4 is a partially exploded perspective view showing another rack and pinion mounting structure in a conventional steering device, and FIG. 5 is a rack and pinion mount structure used in the present invention. FIG. 3 is a sectional view showing the rack shaft housing. 1...Rackshaft housing, 2...Left side mount part, 3...Right side mount part, 4...
Bracket, 5...Bracket, 6...Connection bar, 9...Mounting hole, 10...Mounting hole (long hole), 1
1...Mounting hole, 14, 15...Bracket, 1
6, 16A... Truss type connecting bar member, 19...
...Mounting hole, 20...Mounting hole (long hole).

Claims (1)

[Claims for Utility Model Registration] (1) Attach the rack shaft housing to the body side member at two locations using brackets,
A mounting structure for a rack and pinion in a steering device, characterized in that the bracket is fixed by a connecting bar. (2) A mounting structure for a rack and pinion in a steering device according to claim 1, wherein at least one of the mounting holes provided in the connecting bar is a long hole. (3) A rack and pinion mounting structure in a steering device according to claim 1, wherein the connecting bar is made of a truss-type member. (4) The rack and pinion in the steering device according to claim 1, wherein at least one mount portion of the rackshaft housing is integrally fixed to the rackshaft housing. Mount structure.