JPH11192954A - Rack and pinion type steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rack and pinion type steering device wherein infiltration of water and foreign matter in the inside of rack boots is prevented, a housing can be stably fixed to a dash board. SOLUTION: A rubber mount 9 fitting rack boots 8 also functioning as a mount bush 11 is fitted to a housing 5, so that adhesion between the rack boots 8 and the rubber mount 9 is made possible, infiltration of water and foreign matter can be prevented, and the housing can be stably fixed to a dash board. Further in the rubber mount 9, a rack boots fitting part and a partitioning wall separating the mount bush are provided, also by forming a shape in a mount bush side of the rubber mount 9 in tapered shape, infiltration of water and foreign matter can be more surely prevented, also positioning of the rubber mount 9 relating to the housing 5 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack-and-pinion type steering device, and more particularly to a rack in which a pinion rotated by steering is engaged, a housing in which rack boots are fitted to both ends while covering the rack, and The present invention relates to a rack-and-pinion type steering device which is attached to a vicinity of the rack-boot fitting portion of a housing and includes a mounting bush for bridging the housing to a dash panel.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 5 and 6, a rack-and-pinion type steering device 1 covers a rack 4 in which a pinion 3 rotated by the steering of a steering wheel S meshes, and the rack 4. While racking at both ends
The housing 5 includes a housing 5 into which the shoe 8 'is fitted, and a mount bush 11 attached to the housing 5 near a fitting portion of the rack boot 8'. As shown in FIG. 7, the rack-and-pinion type steering device 1 is mounted on a vehicle body by mounting a mount bush 11 mounted on the housing 5 to a dash board 13 by means of a bracket 12 'and coupling means 17'. '. The fitting of the rack boots 8 ′ to the housing 5 is as follows.
As shown in FIG. 6, a rack boot 8 'is fitted so as to cover the end of the housing 5, and a fitting portion of the rack boot 8' is fastened by a wire 15. Also, JP-A-6-2
In the conventional example described in Japanese Patent Publication No. 98107, as shown in FIG.
The rack boots 8 ′ are fitted directly to the housing 5, and the fitting portions of the rack boots 8 ′ are fastened by bands 18.

[0003]

However, in general, the housing is made of metal and the rack boots are made of resin having higher rigidity than rubber, so that the fitting surfaces of the rack boots of the housing are smooth. If not, a gap is apt to be formed, causing water or foreign matter to enter. Also, in the conventional example described in JP-A-6-298107, the connection between the rack boots and the housing is performed by directly fitting the resin rack boots to the metal housing. , Housing and rack
If the mating surface with the horn is not smooth, a gap is easily generated, which may cause water or foreign matter to enter. Further, since the rack boots are fastened to the housing by wires or bands, it is difficult to control the fastening force, and if the fastening force is insufficient, a gap is easily formed, which may cause water or foreign matter to enter. I was For this reason, a sealer, which is a sealing agent, is used as a means for filling the gap between the fitting portions between the housing and the rack boots, but this has caused an increase in the number of work steps and costs. Further, in the rack and pinion type steering device, the span between the left and right mount bushes is shortened because the mount bush fitted to the housing is erected on the dash board via the bracket.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rack and pinion type steering device capable of reliably preventing water or foreign matter from entering the inside of a rack boot and stably fixing a housing to a dash board. To provide.

[0005]

According to the first aspect of the present invention,
A rack in which a pinion rotated by steering meshes, a housing in which rack boots are fitted to both ends while covering the rack, and a rack mounted near the rack boots fitting portion of the housing; In a rack and pinion type steering device constituted by a mount bush used for erection of a rack boot, a rubber mount is formed by integrating a fitting portion of the rack boot and the mount bush. Adhesion between the mounts is possible, preventing the intrusion of water or foreign matter.In addition, by using a rubber mount as the mount bush, the span between the mount bushes is extended, and the housing is stably mounted on the dash board. Can be fixed.

According to a second aspect of the present invention, in the rack-and-pinion type steering device according to the first aspect, a spacing wall is provided between the rack-boot fitting portion and the mount bush, so that the mounting bush side is provided. Water and foreign substances do not enter from above, and more reliable waterproofing becomes possible.

According to a third aspect of the present invention, in the rack and pinion type steering device according to the first or second aspect, the mount bush side is formed into a tapered shape, so that the rubber mount housing is formed. During the press-in operation, the positioning of the rubber mount with respect to the housing becomes easy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In this embodiment, the same members as those of the conventional example are denoted by the same reference numerals. Rack and pinion type steering device 1 according to an embodiment of the present invention
As shown in FIG. 1, a rack 4 in which a pinion 3 rotated by steering of a steering wheel is engaged, a housing 5 for covering both ends of the rack 4 so as to project, and an end 5a of the housing 5 are provided. A rubber mount 9 fitted to the outer periphery and functioning as a mount bush;
The rack boots 8 are fitted to both end portions 5a and 5b of the base member, and the mount bush 11 is mounted near one of the rack boot fitting portions. As shown in FIG. 2, the rack and pinion type steering device 1 includes a rubber mount 9 at one end 5 a of a housing 5,
The mounting bush 11b is mounted on the dash panel 13 by the bracket 12. Note that reference numeral 17 is
It is a fixing means.

With the above structure, the input shaft 2 is rotated by steering the steering wheel, the pinion 3 directly connected to the input shaft 2 is rotated, and the rack 4 meshed with the pinion 3 reciprocates in the vehicle width direction. In addition, holes are provided at both ends of the rack 4.
A tie rod 7 (to be described later) connected to the tie rod 6 (to be described later) reciprocates, and the steering wheel is given a steering angle by a knuckle arm (not shown) in response to the reciprocating movement of the tie rod 7. The vehicle will be turned.

The housing 5 has one end 5a to which a rubber mount 9 is fitted, a fitting portion 5c of a mount bush 11, a pinion to which the input shaft 2 is connected, and a rack boot 8 fitted. And the other end 5b are formed continuously and integrally.

At one end 5a of the housing 5, a taper portion having a large diameter toward the outside is formed. Inside the large diameter portion, a metal sleeve 18 is provided at a rack end. The rack 4 is slidably supported by the sleeve 18 through a bush 19. At the tip of the rack 4,
A tie rod 7 is slidably connected via a ball joint 6. A rubber mount 9 is fitted on the outer peripheral surface of one end 5 a of the housing 5.
The rack boots 8 are stretched from the tie rod 7 to the rack boots 8.

The rack boot 8 is made of a highly rigid synthetic resin, and is formed by one end 8a, a bellows portion 8b and the other end 8c, and the bellows portion 8b is adapted to correspond to the longitudinal movement of the rack 4. It is formed to expand and contract. As shown in FIG. 4, an annular recess having a concave cross section is formed at one end 8a of the rack boot 8, and this annular recess is fitted to the outer peripheral surface of the rubber mount 9 and opens outward. A wire 15 is inserted into the annular recess, and one end 8 a of the rack boot 8 is fastened to one end 5 a of the housing 5. The other end 8c of the rack boot 8 has an annular recess substantially similar to the one end 8a. The annular recess is fitted to the tie rod 7, and the band 14 is inserted into the annular recess.
The other end 8 c of the rack boot 8 is fastened to the tie rod 7.

As shown in FIG. 3, the rubber mount 9 has a cylindrical portion 9 fitted to a large diameter portion of one end 5a of the housing 5.
a and a taper portion 9b having a shape similar to the taper portion of the one end portion 5a of the housing 5, and annular projections 9c and 9d are formed on the outer peripheral surfaces at both ends of the cylindrical portion. Further, between the annular projections 9c and 9d at both ends, there is formed a spacing wall 9g for separating the fitting part 9e of the rack boot and the mounting bush 9f to which the bracket 12 is attached. The spacing wall 9g is formed so as to prevent water or foreign matter from entering from the fitting portion 9e side of the rack boots. Further, the spacing wall 9g and the annular protrusion 9c at one end prevent water from entering from outside. It is formed so that it acts like a labyrinth packing against foreign substances and foreign substances. The taper portion 9b is formed so as to be in close contact with the taper portion at one end 5a of the housing 5, and is easily positioned by the taper portion 9b when the rubber mount 9 is pressed into the housing 5. And it becomes a retainer after press-fitting.

The rubber mount 9 has an annular projection 9 at one end.
The mounting portion 9e of the rack boot is formed to have a concave cross section by c and the spacing wall 9g, and the mounting bush 9f to which the bracket 12 is attached is formed to have a concave cross section by the spacing wall 9g and the annular projection 9d at the other end. I have. As shown in FIG. 4, an annular concave portion at one end 8a of the rack boot 8 is fitted into a fitting portion 9e of the rack boot 8 having a concave cross-section, and is fastened by the wire 15 so that the rack boot is in a running state. The rack boots 8 do not come off the housing 5 due to vibration. Also,
Since the bracket 12 is fixed to the dash panel 13 so as to fit into the mount bush 9f having a concave cross section, the housing 5 does not come off from the bracket 12.

The other end 5b of the housing 5 is provided with a rack boot fitting portion, and like the one end 5a of the housing 5, a rack is provided so as to protrude from the housing 5. A tie rod 7 is swingably connected to a tip end of the rack boot 4 via a ball joint 6. The rack boot is fitted to one end 5a from the fitting portion of the rack boot to the tie rod 7. A rack boot 8 having the same shape as that of the rack boot 8 is fitted. Each fitting part is fastened by the band 14 and the wire-15.

[0016]

According to the first aspect of the present invention, rack racks are used.
The rubber mount is formed by integrating the fitting part of the shoe and the mount bush, which makes it possible for the rack boot and the rubber mount to be in close contact with each other, preventing the intrusion of water and foreign substances, and mounting the rubber mount. When used together as a bush, the span between the mount bushes becomes longer, and the housing can be stably fixed to the dash board.

According to the second aspect of the present invention, since the spacing wall is provided between the rack boots fitting portion and the mount bush, water and foreign matter do not enter the mount bush from the mount bush side. Waterproofing becomes possible.

According to the third aspect of the present invention, since the mount bush side has a tapered shape, the rubber mount can be easily positioned with respect to the housing when the rubber mount is pressed into the housing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a rack and pinion type steering device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of a bracket for mounting the rack and pinion type steering device according to the embodiment of the present invention to a dash panel.

FIG. 3 is a perspective view of a rubber mount according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional side view showing a fitting state of a rack boot to a rubber mount.

FIG. 5 is a perspective view of a rack and pinion type steering device according to a conventional example.

FIG. 6 is a longitudinal sectional side view of a rack and pinion type steering device according to a conventional example.

FIG. 7 is a longitudinal sectional side view of a bracket for attaching a rack and pinion type steering device according to a conventional example to a dash panel.

FIG. 8 is a longitudinal sectional side view of a rack and pinion type steering device according to another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rack and pinion type steering device 2 Input shaft 3 Pinion 4 Rack 5 Housing 6 Ball joint 7 Tie rod 8, 8 'Rack boots 9 Rubber mount 11, 9f Mount bush

Claims (3)

[Claims] 1. A rack in which a pinion rotated by steering engages, a housing that covers the rack, and rack boots are fitted to both ends while covering the rack, and the rack boot of the housing.
In a rack and pinion type steering device, which is mounted near a toe fitting portion and is provided with a mount bush used for erection of a housing on a dash panel, the fitting portion of the rack boots and the mount bush are integrated. A rack-and-pinion type steering device characterized by being formed into a rubber mount. 2. The rack and pinion type steering device according to claim 1, wherein a spacing wall is provided between said rack boots fitting portion and said mount bush. 3. The rack and pinion type steering apparatus according to claim 1, wherein the mount bush side has a tapered shape.