JPH0375771B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a resin rod end that is attached to the end of a rod that transmits operating force and connects the shaft at a required angle in all directions with respect to the transmitted member to be connected. Regarding.

Conventional technology Conventional rod ends were made entirely of metal. The ball joint portion connected to the driven member also had a complicated structure because its axis was bendable.

Problems to be Solved by the Invention Conventional rod ends are made of metal and have a complicated structure, resulting in high costs. This invention uses resin as the main material to significantly reduce manufacturing costs and weight, and its structure allows for smooth bending action on the driven member.

Measures to solve the problem: A sleeve with a slit of the required width in the axial direction is molded with resin and fitted onto the connecting outer peripheral surface of the metal ball joint. After inserting a wide shim and expanding the inner diameter of the sleeve, the rod end body is molded directly and integrally with the outside of the sleeve using the same resin, and the ball joint is attached to the rod body to the desired degree of play. It has a resin rod end.

Function Since the present invention is configured as described above, the ball joint fitted into the rod end main body is such that the inner diameter of the sleeve is expanded by the shim fitted into the slit, and the sleeve is inserted into the rod end body. The main body can be directly molded to ensure the desired degree of play.

Embodiments Hereinafter, embodiments of the present invention will be described. The resin rod end 1 of the present invention includes a rod end body 2 molded using a material such as polyacetal resin, and a rod end body 2 that is rotatably fitted into the base of the rod end body. It is composed of a steel ball joint 3. The ball joint 3 has a spherical outer circumferential surface 3a that connects with the rod end body 2, and has a shaft hole 3b in the center through which the connecting shaft 5 of the driven member 4 is inserted.
is opened.

To mold the rod end main body 2, first, the ball joint 3 is inserted into a mold (not shown), and a spacer (not shown) is connected to a part of the connecting outer surface 3a to fill a desired space. Then, for example, polyacetal resin is injected and a sleeve 8 having a slit 7 is fitted onto the connecting outer circumferential surface 3a of the ball joint 3, ie, molded as shown in FIG. At this time, a shim 6 having the same width and a required wider circumferential width than the slit 7 is formed in the same mold using, for example, the same resin.

Next, the shim 6 is inserted into the slit 7 and the inner diameter of the sleeve 8 is expanded to the required width as shown in FIG. A rod end body 2 is molded by injecting resin and recessing the outer circumferential surface, and having a ball joint 3 rotatably fitted inside a sleeve 8 with an appropriate degree of play. 9
is a screw hole provided at the proximal end of the rod end body 2, and whether formed during the molding or after molding,
It may be formed by cutting. Then, the rod 10 is screwed together.

The resin for molding the rod end body 2 is not limited to the polyacetal mentioned above, and can be appropriately selected from polyamide, polycarbonate, polybutylene tephthalate, and nylon. Further, the sleeve 8 built into the main body 2 is the same as the shim 6.

In the above embodiment, the outer circumference of the sleeve 8 is cylindrical, but as shown in FIG. 10, the center has a large diameter and both ends have a small diameter and are tapered on both sides so that the sleeve 8 does not slip out of the main body 2. It's also good.

Since the degree of play with respect to the ball joint 3 changes depending on the injection molding conditions of the rod end body 2, it is adjusted to the optimum degree.

Effects of the Invention Since this invention is as described above,
The ball joint can be rotatably fitted in an extremely simple molding process, and the sleeve and shim are completely integrated with the rod end body, making it comparable in strength to when molded from the same material all at once. Therefore, it is now possible to use resin for the rod end body, which was previously unachievable, and the manufacturing cost and weight can be significantly reduced, and the ball joint can be rotated semi-permanently and smoothly. This has a great effect on improving the operating force transmission mechanism.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an external perspective view of the rod end of the invention, FIG. 2 is a longitudinal cross-sectional view thereof, and FIGS. 3 to 6 are exploded perspective views thereof. FIG. 3 shows the sleeve, FIG. 4 shows the shim, and FIG. 6 shows the rod end body. FIGS. 7 to 9 are perspective views showing the assembly and molding sequence. FIG. Figure 8 shows the rod end in its fitted state, Figure 8 shows the rod end in its completed state with the shims fitted into the slits of the sleeve, and Figure 9 shows the rod end in its completed state with the shims molded into the tip. Figure 10 shows another example of the flexible coupling. FIG. 1... Rod end, 2... Rod end body, 3... Ball joint, 4... Driven member, 5... Connection shaft, 6... Shim, 7... Slit, 8... Sleeve, 9... Screw Hole, 10... Rod.

Claims (1)

[Claims] 1. A sleeve with a slit of the required width formed in the axial direction is molded from resin and fitted onto the connecting outer peripheral surface of the metal ball joint, and a wide shim molded from resin is fitted into the slit of this sleeve. This resin rod end is characterized in that after expanding the inner diameter of the sleeve, the rod end body is molded directly and integrally with resin on the outside of the sleeve, and a ball joint is attached to the rod body at a desired degree of play.