JPH0198770A - Dust cover - Google Patents

Abstract

PURPOSE:To enhance rigidity of a buried ring and to facilitate manufacture therefor by providing a ring shaped like a top-cut cone having a plurality of angular portions in the circumferential direction or a polygonal truncated cone. CONSTITUTION:A ring 11 is shaped like a top-cut cone having a plurality of angular portions 12, 12... in the circumferential direction. In order to manufacture such a ring 11, previously hard material such as metal or the like is punched in a polygonal shape, and further formed in a conical shape by a press. As the ring 11 of this shape has high rigidity and a cover main body and angular portions 12, 12 of the ring 11 contact each other at many contact points, slip-off of the ring can be prevented, and as spring force towards the center of the ring 11 is applied, elastic force and restoring force of a dust cover itself can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dust cover that hides the surroundings of ball joints and the like used in steering mechanisms of automobiles from the outside air.

BACKGROUND ART Generally, a tie rod 3 is connected to a cross rod 2 projecting from a steering gear box l shown in FIG. 7 via ball joints 4a and 4b, and is connected to a steering mechanism (not shown). Although a configuration is known in which a dust cover 5 covering the ball joint 4b is provided and connected to a strut type shock absorber (not shown), the structure shown in FIG. 8 is often used as the dust cover 5. That is, this dust cover 5 has rings 7a made of a hard material such as metal located near the upper and lower ends of a substantially cylindrical cover body 6 made of rubber or soft resin.

7b is buried to prevent the cover body 6 from falling out.

FIG. 9 shows an example of the shape of the ring 7a, and FIG. 10 shows an example of the shape of the ring 7b. Further, FIG. 11 shows an example of the shape of another ring 7c in place of the ring 7b. Particularly, when focusing on the example of the shape of the ring 7b, the ring 7b as a whole has a truncated cone shape when viewed from the side, and furthermore, in the example shown in FIG. 11, it has an inverted truncated cone shape. In addition to the above, means for providing slopes on the inner and outer edges of the annular reinforcing plate, a ring in which cylindrical portions and conical portions are alternately formed, a reinforcing ring structure consisting of a truncated conical portion and a cylindrical portion, or A structure in which an overhang is formed on a hard elastic ring consisting of a flat part and a conical part is known and used.

Problems to be Solved by the Invention However, in such a structure of the conventional dust cover 5, the rings embedded in the cover body 6, especially the rings 7b and 7c, have a shape that is simply a truncated cone or an inverted truncated cone. Because of this, there is a problem that the ring has poor rigidity and is easily deformed by a strong external force or easily comes off. On the other hand, in the case of various examples of shapes other than those mentioned above, although they have the effect of improving the rigidity of the ring and preventing it from coming off, the structure of the ring itself is complicated, so
It has the drawbacks of being difficult to manufacture and increasing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dust cover that solves the problems of the conventional dust cover, increases the rigidity of the embedded ring, and is easy to manufacture.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides break-through rings made of a hard material near the upper and lower ends of the cover body, which is made of rubber or soft resin and has a substantially cylindrical shape. In the buried dust cover, the ring is formed into a conical shape or a truncated polygonal pyramid shape with a plurality of corners attached in the circumferential direction.

Function The ring with the above shape has high rigidity, and since the cover body and the corner of the ring are in contact with each other at multiple contact points, it is difficult for the ring to come off, and the spring strength toward the center of the ring is high. As a result, the elastic force and restoring force of the dust cover itself are increased.

EXAMPLE An example of the dust cover according to the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of a ring embedded in a dust cover according to the present invention.
1 has a conical shape with a plurality of corners 12, 12, . . . attached in the circumferential direction. In order to manufacture such a ring 11, it is sufficient to punch out a hard material such as metal into a polygonal shape in advance, and then mold it into a conical shape using a press.

3 and 4 show a second embodiment of the ring used in the present invention, and the illustrated ring 13 has a plurality of corners 12, 12, etc. in the circumferential direction, similar to the ring 11 described above. It is formed in the shape of a truncated polygonal pyramid. Ring like this 1
3, it is sufficient to punch out a hard material such as metal into a polygonal shape in advance and mold it into a polygonal pyramid shape using a press machine.

5 and 6 show an example of the shape of a deformable ring 14, which is a third embodiment of the ring used in the present invention, and this deformable ring 14 has a plurality of corners 12, +2, . . . in the circumferential direction. are formed, while each corner 12. Recesses 15, 15, . . . are formed in the middle of +2, . In order to manufacture such a deformable ring 14, a hard material such as metal is punched out in advance into a polygonal shape, and the hypotenuse of the polygonal pyramid is press-formed into an uneven shape using a press.

The eleventh second and third embodiments of the ring used in the dust cover according to the present invention have been described above, but in any of the embodiments, the rings 11, 13, 14 have a plurality of corners in the circumferential direction. It is characterized by being attached and formed in the shape of a cone or a truncated polygonal pyramid.

According to this configuration, each ring I1.13.14 is
When manufacturing the dust cover 5 by embedding it in the cover body 6 shown in the figure, the rigidity of each ring is maintained high, and problems such as the rings coming off from the cover body 6 due to the action of the corner portions 12 are solved. You can. Furthermore, each ring 11
, 13 and 14 maintain a spring force toward the center, so that when the dust cover 5 is deformed by an external force, the dust cover 5 has a large restoring force.

Effects of the Invention As explained in detail above, according to the dust cover according to the present invention, rings made of a hard material are embedded near the upper and lower ends of the cover main body, which is made of rubber or soft resin and has a substantially cylindrical shape. In this dust cover, since the ring is formed in the shape of a cone or a truncated polygonal pyramid with a plurality of corners attached in the circumferential direction, the following effects are brought about. In other words, the rigidity of each ring is maintained high, which has the advantage of improving the strength of the dust cover itself. On the other hand, due to the action of the corners formed on each ring, the cover body and the ring come into multi-contact contact, and the two are tightly connected. This prevents accidents such as the ring being removed from the cover body and falling off. Furthermore, there is an advantage that the elastic force of the dust cover and the restoring force upon deformation are increased by the spring force of each ring. Furthermore, since each ring is extremely easy to manufacture, the cost of the dust cover does not increase, and it is useful for use in dust covers for automobile ball joints.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a first embodiment of a ring used in a dust cover according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a second embodiment of the same. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a plan view showing the third embodiment, and FIG. 6 is a sectional view taken along line IV-IV in FIG. 5.
7 is a partial perspective view showing an example of a spring mechanism of an automobile; FIG. 8 is a sectional view of essential parts showing an example of a conventional dust cover; FIGS. 9, 10, and FIG. 11 is a perspective view showing an example of the shape of a conventional ring. 5...Dust cover, 6...Cover body, 11.1
3...Ring, 12...Corner, 14...Deformed ring, 15...Recess, 12 Corner Fig. 3 Fig. 4 Fig. 5 12 Corner Fig. 7 Fig. 8

Claims (1)

[Claims] (1) In a dust cover in which rings made of a hard material are embedded near the upper and lower ends of the cover main body, which is made of rubber or soft resin and has a substantially cylindrical shape, the shape of the rings is arranged in a plurality of shapes in the circumferential direction. A dust cover characterized by being formed in the shape of a truncated cone or a truncated polygonal pyramid with corners attached.