JPH11173420A - Boot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join both end surfaces easily, surely, and integratedly with each other by fitting a projection part of one end surface of a dividing part to a recessed part of the other end surface without strain. SOLUTION: A dividing part 2 divided in an axial line direction is arranged, a projection part 4 which is narrowed in order from a tip end part to a root part along the total length is arranged on one end surface 2a of the dividing part 2, and a recessed part 3 engaged with the projection part 4 enlarged in order from an inlet part to a depth part is arranged along a total length on the other end surface 2b. An inner side surface 3a of the recessed part 3 is formed on a taper surface inclined inward in order from the depth part toward the inlet part. The width of the inlet part of the recessed part 3 is formed larger than the thickness of the tip end part of the projection part 4, and thereby, the projection part 4 is engaged with the recessed part 3 without strain. It is also possible to join both end surfaces 2a, 2b of the dividing part 2 easily, surely, and integratedly with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boot, and more particularly, to a cylindrical boot made of an elastic material such as rubber which is effective for sealing a bent rotating portion of a universal joint.

[0002]

2. Description of the Related Art Generally, such boots are constructed as shown in FIGS. That is, the boot 21 has a bellows cylindrical shape made of an elastic body such as rubber, and has a dividing portion 22 for dividing the whole in the axial direction.
Are formed in one place.

[0003] On one end surface 22a of the divided portion 22, a convex portion 24 gradually narrowing from the front end portion to the root portion is formed over the entire length, and the other end surface 22b is engaged with the convex portion 24. A concave portion 23 is formed over the entire length, and the concave portion 23 gradually widens from the entrance portion to the back portion.

Then, the boot 21 constructed as described above is used.
By fitting the bending rotating part (not shown) of the universal joint,
An adhesive is applied to both end surfaces 22a and 22b of the divided portion 22,
By engaging the convex portion 24 of one end surface 22a with the concave portion 23 of the other end surface and holding the two end surfaces 22a and 22b in a tightly pressed direction for a predetermined time, the two end surfaces 22a
a and 22b are integrally joined.

However, in the boot 21 having the above-described structure, the entrance of the concave portion 23 of the other end surface 22b of the divided portion 22 is narrower than the deep portion, so that the convex portion of the one end surface 22a is formed. When engaging the recess 24 with the recess 23,
If the projection 24 is forcibly engaged with the recess 23, the inner portion 25 or the outer portion 26 of the entrance of the recess 23 is pressed inward by the tip of the projection 24 and bent to be bent. You may get inside. For this reason, it is necessary to perform an operation of returning the portion that has entered the recess 23 to the original state. If the operation takes a long time, the adhesive hardens.
The junction between 2b becomes unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. In the case where a convex portion formed on one end surface of a divided portion is engaged with a concave portion formed on the other end surface, The inner portion or the outer portion of the entrance of the concave portion is not pressed and bent by the tip portion of the convex portion and enters the concave portion, and the convex portion can be fitted into the concave portion without difficulty. It is another object of the present invention to provide a boot that can easily and surely be integrally joined between both end surfaces.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a cylindrical boot made of an elastic body such as rubber for sealing a bending and rotating portion of a universal joint. In addition to forming a dividing portion that divides the entirety in the axial direction, a protruding portion whose one end portion is thicker than the root portion over the entire length is formed on one end surface, and the protruding portion is engaged with the protruding portion over the entire length on the other end surface. A means that forms a concave portion that fits, and that has one of the inner surface and the outer surface of the concave portion formed as a tapered surface that inclines inward or outward sequentially from the back toward the entrance. It is.

[0008]

According to the present invention, by adopting the means as described above, the convex portion on one end face of the divided portion can be smoothly engaged with the concave portion on the other end surface, so that the inner side of the entrance portion of the concave portion can be engaged. The portion or the outer portion is prevented from being pressed by the tip of the projection and bent to enter the recess. Therefore, it is possible to easily and reliably join between both end surfaces of the divided portion.

[0009]

Embodiments of the present invention shown in the drawings will be described below. 1 to 3 show an embodiment of a boot according to the present invention. The boot 1 shown in this embodiment has a bellows cylindrical shape made of an elastic body such as rubber, and has a single divided portion 2 which divides the whole in the axial direction.

On one end surface 2a of the divided portion 2, a convex portion 4 gradually narrowing from the front end portion to the root portion is formed over the entire length, and the other end surface 2b is formed on the one end surface 2b from the entrance portion to the back portion. A concave portion 3 that can be engaged with the convex portion 4 that gradually widens toward is formed over the entire length.

The inner side surface 3a of the concave portion 3 is formed in a tapered surface which is gradually inclined inward from the back portion to the entrance portion, and the width of the entrance portion of the concave portion 3 is larger than the thickness of the tip portion of the convex portion 4 by this tapered surface. It is getting bigger.

Then, the boot 1 constructed as described above is fitted on a bending and rotating portion (not shown) of the universal joint, and an adhesive is applied to the entire both end surfaces 2a and 2b of the divided portion 2. By engaging the convex portion 4 of the end surface 2a with the concave portion 3 of the other end surface and holding the end surfaces 2a, 2b in a direction in which the end surfaces 2a, 2b are brought into close contact with each other for a predetermined time, the end surfaces 2a, 2b
The spaces will be joined together.

In the boot 1 according to this embodiment configured as described above, the inner surface 3a of the recess 3 of the other end surface 2b of the divided portion 2 is formed as a tapered surface.
By making the width of the entrance of the recess 3 larger than the thickness of the tip of the projection 4 of the one end face 2a, the projection 4 of the one end face 2a can be fitted into the recess 3 of the other end face 2b without difficulty. You can do it. Therefore, the inside portion 5 or the outside portion 6 of the entrance of the concave portion 3 is not pressed by the tip of the convex portion 4 and bent to enter the concave portion 3. As a result, there is no need to perform any operation of returning the portion that has entered the concave portion 3 to the original state. In addition, the operation does not take time to cure the adhesive.

In the above description, the inner surface 3a of the concave portion 3 at the other end surface 2b of the divided portion 2 is formed as a tapered surface which is gradually inclined inward from the back to the entrance. The side surface 3b may be formed as a tapered surface that is sequentially inclined outward from the back toward the entrance.

[0015]

According to the present invention, the entrance of the recess at the other end of the divided portion can be made larger than the tip of the protrusion at the one end of the divided portion. When the both end surfaces are integrally joined, the convex portion on one end surface can be smoothly engaged with the concave portion on the other end surface. Therefore, the inside portion or the outside portion of the entrance portion of the concave portion is not pressed by the tip portion of the convex portion and bent so as to enter the concave portion, and the work of returning the bent portion to the original state is unnecessary, The work does not take time and the adhesive applied to both end surfaces hardens. As a result, an excellent effect is achieved such that the both end surfaces of the divided portion can be easily and reliably joined integrally.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a boot according to the present invention, and is an explanatory view showing a state before joining.

FIG. 2 is a partially enlarged sectional view of the one shown in FIG.

FIG. 3 is a partially enlarged cross-sectional view showing a state after bonding of FIG. 1;

FIG. 4 is a perspective view showing an example of a conventional boot, and is an explanatory view showing a state before joining.

FIG. 5 is a partially enlarged sectional view of the one shown in FIG. 4;

FIG. 6 is a partially enlarged cross-sectional view showing a state after bonding of FIG.

[Explanation of symbols]

 1, 21 Boots 2, 22 Divided part 2a, 22a One end face 2b, 22b Other end face 3, 23 Depression 3a Inner face 3b Outer face 4, 24 Convex parts 5, 25 ... inner part 6, 26 ... outer part

Claims (1)

[Claims] 1. A cylindrical boot made of an elastic body such as rubber for sealing a bent rotating part of a universal joint, wherein at least one
Along with forming a dividing portion that divides the whole in the axial direction, a convex portion whose one end portion is thicker than the root portion over the entire length is formed on one end surface, and the convex portion is formed on the other end surface over the entire length. A concave portion to be engaged is formed, and either one of the inner side surface and the outer side surface of the concave portion is formed as a tapered surface which inclines inward or outward sequentially from the back to the entrance. Boots to do.