JPH027741Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boot-seal fluid transmission pipe attachment device with a breather for installing a fluid transmission pipe in a rack and pinion type steering system.

The rack and pinion type steering device is equipped with a housing attached to the vehicle body, which rotatably houses a pinion that rotates as the steering wheel rotates, and a rack shaft that meshes with the pinion and is slidably fitted in the axial direction. The left and right link rods are connected to both ends of the rack shaft via ball joints, and when the steering wheel is rotated, the pinion rotates, the rack shaft slides in the axial direction, and the left and right front wheels are steered via the link rods. The left and right ends of the housing and the left and right link rods are sealed with rubber boot seals to prevent water and dust from entering the bearings and ball joints inside the housing. It is prevented.

The left and right boot seals mentioned above expand and contract as the shaft slides in the axial direction, and the air pressure inside the sealed boot seals fluctuates. It is common practice to provide a seal (within the boot seal) to prevent fluctuations in the air pressure inside the boot seal.

As shown in FIG. 4, for example, the fluid transmission pipe attachment portion of a conventional boot seal has a breather attachment hole cylindrical portion D directed outward at a position near one end of the boot seal (the portion where it fits into the housing). One end portion C of a plastic breather A, which is a tubular member with a protruding flange B in the center portion, is fitted into the breather mounting hole cylindrical portion D, and the outer periphery of the other end portion E of the breather A is fitted. A structure is adopted in which one end of a fluid transmission pipe (not shown) is fitted.

In such a conventional fluid transmission pipe mounting structure, the length of the breather A is long and the breather mounting hole protrudes outward to a greater extent than the cylindrical portion D, so there is a risk of interference with other parts. The proximal end (root) of the breather mounting hole cylindrical portion D is likely to be twisted and deformed due to vibrations of the fluid transmission pipe fitted in the breather A and its tip E, and if this twisted deformation is repeated for a long period of time, There is a problem in that a situation may occur in which cracks occur in that part and the airtightness is lost.

Furthermore, the fitting part between the breather A and the breather mounting hole cylindrical part D and the fitting part between the breather A and the fluid transmission pipe are both made of rubber and hard plastic, so the adhesiveness is not very good. There are concerns that the installation will be unstable and the sealing performance will be less reliable.

The main purpose of the present invention is to address the conventional problems as described above.

That is, the present invention has a flange portion at one end that engages with the proximal edge of the breather attachment hole cylindrical portion of the boot seal,
Further, a breather made of a tubular member having a conical flange portion at the other end that engages with the tip edge of the cylindrical portion of the breather mounting hole is inserted and fixed into the breather mounting hole of the boot seal from the conical flange portion, This device is characterized in that a fluid transmission pipe is fitted and fixed to the outer periphery of the cylindrical portion of the breather attachment hole.

By adopting the above-mentioned structure, the present invention allows easy insertion of the breather due to the conical flange when it is inserted, and after insertion, it is held in the breather mounting hole by the flange on both ends, so the breather does not come out. In addition, the rigidity of the proximal end portion of the breather mounting hole cylindrical portion is improved. In addition, the conical part of the conical flange makes it easy to insert the fluid transmission pipe, and after the fluid transmission pipe is inserted, the breather mounting hole cylindrical part, which is stiffened from the inside with a breather, and the fluid transmission pipe are fitted with rubber materials. Since they fit together and are fitted elastically, they have good adhesion and improve airtightness. Furthermore, since the length of the breather is short, there is no risk of interference with other parts, and together with the improved rigidity of the breather, there is almost no twisting or deformation of the base end of the breather mounting hole cylinder.
Durability can be improved. Further, it can be fixed more firmly by using a clamp on the fluid transmission tube or by using an adhesive or the like on the insertion part.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows an embodiment of the present invention, in which 1 is a boot seal, 2 is a cylinder with a breather mounting hole integrally provided on the boot seal and protrudes outward, 3 is a breather mounting hole, and 4 is a breather. , 5 is a fluid transmission pipe, 6 is a clamp, and the breather 4 has a flange 7 at one end and a conical flange 8 at the other end, as shown in FIG.
It is composed of:

As for the constituent materials, the boot seal 1 and the fluid transmission pipe 5 are made of ordinary materials such as rubber, and the breather can be made of plastic or the like, but these are not particularly limited.

To assemble the breather 4, insert the breather 4 into the breather mounting hole 3 from the inside of the boot seal 1 using the conical flange 8 as a guide. 8 are fixed by engaging with the leading edges of the breather mounting hole cylindrical portion 2, respectively. After fitting the breather 4 into the breather mounting hole cylindrical portion 2, a fluid transmission pipe 5 is fitted around the outer periphery of the mounting hole cylindrical portion 2 and fixed with a clamp 6. Instead of using a clamp, adhesive or the like may be used for the fluid transmission tube insertion part or the breather fitting part.

In addition, when the breather 4 is inserted and fixed into the breather mounting hole cylindrical part 2, the tip of the conical flange part 8 protrudes slightly outward from the outer peripheral surface of the breather mounting hole cylindrical part 2, as shown in FIG. This protruding portion can be embedded into the inner peripheral surface of the fluid transmission pipe 5 fitted to the outer periphery of the breather attachment hole cylindrical portion 2, thereby preventing it from coming off and improving airtightness.

Figure 3 shows an annular lip 9 around the cylindrical part 2 of the mounting hole.
This further ensures the insertion and removal of the fluid transmission pipe 5.

As described above, according to the present invention, it is possible to easily and reliably attach the breather to the cylindrical portion of the breather attachment hole of the boot seal and to attach the fluid transmission pipe, improve airtightness, and reduce the length of the breather. Since the length of the mounting hole is as short as the cylindrical part, not only is there no risk of interference with other parts, but the proximal end (root) of the breather mounting hole cylindrical part will hardly be distorted.
It is possible to improve durability, and it can bring about a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a boot seal device according to the present invention, FIGS. 2 and 3 are enlarged cross-sectional views of an embodiment of the present invention, and FIG. 4 is a cross-sectional view of a contrasting part of a conventional example. 1... Boot seal, 2... Breather mounting hole cylindrical part, 3... Breather mounting hole, 4... Breather, 5... Fluid transmission pipe, 6... Clamp, 7...
Flange, 8...Conical flange, 9...Rip.

Claims (1)

[Scope of utility model registration request] It is made up of a tubular member having a flange at one end that engages with the proximal edge of the cylindrical portion of the breather attachment hole of the boot seal, and a conical flange at the other end that engages with the tip edge of the cylindrical portion of the breather attachment hole. The breather is fitted and fixed into the cylindrical portion of the breather mounting hole of the boot seal from the inside using the conical flange as a guide, and a fluid transmission pipe is fitted and fixed to the outer periphery of the cylindrical portion of the breather mounting hole. Boot seal fluid transmission pipe attachment device.