JPH0518534Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This idea houses the universal joint inside and prevents leakage of the grease filled in the universal joint and water from the outside.
The present invention relates to a boot band for a universal joint that fastens a boot for a universal joint used to prevent the intrusion of dust and the like.

[Prior art]

Conventionally, this type of boot band consists of a metal band member 1, a lever 2, and a catch 3, as shown in FIG. The band-shaped member 1 is made of a thin steel band plate with a narrow width compared to its length, and is curved into a ring shape, with both ends 4 and 5 touching each other, and a lever 2 is attached to the outside of one of the palm-joining parts. The two ends 4 and 5 of the strip member 1 are overlapped and fixed together by spot welding or the like. The lever 2 uses a steel plate that is thicker than the strip member 1. To tighten, push lever 2 in the direction of arrow A. As a result, the lever 2 rotates using the inner end point P as a fulcrum, and at this time, the spot welded fixing point Q rotates, and the diameter of the ring of the band member 1 is reduced.
Tightening is performed. That is, the lever 2 exerts a lever action using the outer end 6 as the point of force, P as the fulcrum, and Q as the point of action. The stopper 3 fastens the vicinity of the outer end 6 of the lever 2 to the strip member 1 after the above-mentioned tightening, and maintains the tightened state.

[Problem that the invention attempts to solve]

Here, as shown in FIGS. 2 and 3, since the strip member 1 is usually formed by pressing a thin metal plate, it has a sharp edge portion 7 at the edge. On the other hand, since the boot 8 is required to have perfect sealing properties since it accommodates the universal joint 9 therein, it is necessary to tighten the contact portion 10 with a considerably large tightening force. Furthermore, since the width of the band groove 11 of the boot 8 is matched to the width of the stopper 3, when the boot band is attached to the band groove 11, the band member 1 is inclined by the gap created between the band groove 11 and the band groove 11. There are many things to do. Therefore, the belt-shaped member 1 bites into the boot 8 and strong stress is generated concentrated at the part where it contacts the edge portion 7, causing the boot 8 to repeatedly deform as the universal joint 9 operates and external forces are repeatedly applied. As a result, the edge portion 7 acts like a cutter,
There are problems such as cracks occurring from the contact portion (arrow portion in Fig. 3).

[Means for solving the problems] This invention solves the above problems and provides a boot band for a universal joint that improves the durability of the boot by applying a thin film of synthetic resin to the surface of the metal boot band. Formed.

【Example】

Hereinafter, the present invention will be explained according to embodiments shown in the drawings. FIG. 1 shows an embodiment of the invention. Note that the same parts are denoted by the same reference numerals and the description thereof will be omitted. A thin film 12 made of synthetic resin such as polypropylene, nylon, or vinyl chloride, or rubber is formed on the surface of the belt-shaped member 1 of the boot band, covering the edge portion 7 and tightening the contact portion 10 of the boot 8 with a large tightening force. However, strong concentrated stress does not occur even when
To prevent cracks in the boots 8. Since the corners of the thin film 12 have a smooth shape and have greater elasticity than the metal strip member 1, appropriate adhesion can be obtained. Note that the synthetic resin thin film 12 is formed, for example, as follows. First, the boot band is hung on a hanger, and through a heating process, it is infiltrated into synthetic resin powder. The powder adheres to the surface of the strip member 1 and passes through the heating process again, so that the powder is completely fused and forms a smooth thin film 12. The thin film 12 may be formed by a spray method or a coating method.

【effect】

As mentioned above, in the boot band for a universal joint according to this invention, a thin film of synthetic resin is formed on the band-like member, so even if the band-like member is strongly tightened, the edges are smooth due to the thin resin film. , stress concentration at the edge portion is alleviated, and the durability of the boot is not impaired. In addition, since it is easy to coat the resin layer, it is inexpensive as a means of alleviating stress concentration, and since the entire band member is coated, it has a high rust prevention effect and does not require the use of expensive materials such as stainless steel. There is no. Furthermore, if it is formed not only on the belt-shaped members but also on the levers and clasps, it can prevent the occurrence of rust.
Unlike conventional boot bands, there is no need to select a corrosion-resistant material such as stainless steel, and only mechanical strength needs to be considered, greatly expanding the degree of freedom in design.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a state in which the boot band for a universal joint according to the present invention is attached to a boot, Fig. 2 is a front view showing a conventional boot band, and Fig. 3 is a sectional view showing a conventional boot band for a universal joint attached to a boot. FIG. DESCRIPTION OF SYMBOLS 1... Band-shaped member, 2... Lever, 3... Clasp, 7... Edge portion, 8... Boot, 11... Band groove, 12... Thin film.

Claims (1)

[Scope of utility model registration request] A boot is attached at both ends to the outer periphery of separate rotating shafts and houses a universal joint for connecting the rotating shafts. A thin film made of synthetic resin is formed on the surface of a boot band that is fastened to the rotating shafts. A boot band for a universal joint, characterized by a thin film that gives the edges of the boot band a smooth shape.