JPS5922085B2 - Manufacturing method for rotatable joints - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a rotatable joint such as a rod end ball joint.

Conventionally, a trochanter having a spherical surface is fitted into a cylindrical bush, and by pressing this, the inner surface is plastically deformed so as to be in contact with the spherical surface of the trochanter in a rotatable manner to form a race. There are known methods of manufacturing rotatable joints that fit onto the housing and are caulked (for example, Japanese Patent Publication No. 38-25113, Japanese Patent Publication No. 46-15011,
Publication No. 53-4586, etc.).

In this type of rotatable joint, the trochanter and race are in direct contact, so in order to prevent wear and ensure stable rotation, it is desirable to provide an oil groove or oil reservoir on the inner surface of the race. However, none of the conventional ones has an effective oil groove.

British Patent No. 971539 discloses that the inner surface of the race is formed into a concave arc surface, and a circumferential groove is formed on the arc surface as an oil groove, and after a trochanter is fitted, the trochanter is expanded through a shaft hole. A method has been proposed in which the trochanter is held in place by a race, but simply forming an oil groove parallel to the direction of rotation of the trochanter does not provide sufficient lubrication, and this is not a desirable form of oil groove. . On the other hand, regarding the means for fixing the race to the housing, the outer peripheral edge of the race was widened into a chamfer formed in the mounting hole of the housing and was caulked. ) (Special Publication No. 53-4586), the inner surface of the mounting hole of the housing was formed into an arc shape, and the arc-shaped portion of the outer circumferential surface of the race was press-fitted! 2 (British Patent No. 9715
No. 39), or by using two short tubular bushes to press-fit the push to become a race from both sides separately and widening the opening edges (British Patent No. 12).
No. 50067), etc., are structurally extremely complex and require press molds and equipment for that purpose.

The first object of the present invention is to obtain a rotatable joint having an ideal form of oil grooves in at least two directions on the inner surface of the race, and the second object is to fix the race to the housing. To provide a method for manufacturing a rotatable joint which can be caulked in a simple manner and can thereby form an oil groove in one direction.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is a trochanter having a spherical part 2 and a shaft hole 3 formed in the center, 4 is a cylindrical pusher into which the trochanter 1 is fitted,
A groove 5 is carved on the inner surface. The grooves 5 are not limited to the axial direction, but may have a bias shape as shown in FIG. 2, or a lattice shape in which these grooves intersect. Also, Bushu 4
In the embodiment, the outer surface is formed into a concave arc surface 6 that substantially corresponds to the spherical portion 2, and the midsection is made thinner. By press-molding the cylindrical bush 4 into which the trochanter 1 is fitted as described above, the inner surface of the cylindrical bush is plastically deformed so as to correspond to the spherical surface 2 of the trochanter 1, as shown in FIG. , a race 7 is formed which rotatably holds the trochanter.

By doing so, the grooves 5 formed on the inner surface of the race 7, which are formed in the axial direction, have their upper and lower opening ends narrowed 8a, as shown in the enlarged view of FIG. A suitable oil groove 8 is formed, and if the open end is completely sealed, it becomes an oil sump.

Next, as shown in Fig. 4, a circumferential groove 10 for caulking is formed in the center of the inner surface of the mounting hole of the housing 9, and the race 7 as shown in Fig. 3 is fitted into the mounting hole. When the outer circumferential end 7a of the race is pressed, since the center part of the race 7 is thin, it is deformed and press-fitted 11 into the circumferential groove 10, and is properly caulked. Moreover, as a result of this, an oil groove 12 is provided around the center of the inner surface of the race, and this oil groove 1
2 and the oil groove 8 intersect with each other, creating an ideal oil groove configuration in two directions. According to the manufacturing method of the rotatable joint of the present invention, when the cylindrical bushing is press-molded with the trochanter fitted, the inner surface of the race has an oil groove or a sealed opening end. An oil sump is formed, which intersects with the direction of rotation of the trochanter, creating an ideal oil groove or oil sump. Moreover, when caulking the lace into the uzing, the thin mid-wall part of the lace bulges out into the circumferential groove on the inner surface of the uzing and is caulked, so that the lace can be consolidated by a simple means, and the lace has the above-mentioned bulge on the inner surface. As the oil comes out, a circumferential groove is formed, which becomes an oil groove in the rotational direction of the trochanter.
By intersecting the oil groove described above, it is possible to form an ideal oil groove in two directions.

[Brief explanation of drawings]

The drawings show an embodiment of the method for manufacturing a rotary joint according to the present invention, in which Fig. 1 is a cross-sectional view of a trochanter fitted into a cylindrical bush, and Fig. 2 is a sectional view of a cylindrical bush with a bias-shaped groove. Figure 3 is a cross-sectional view of the pressed cylindrical bushing, Figure 4 is a cross-sectional view of the rod end pole joint, Figure 5 is a plan view of the same, and Figure 6 shows the form of the oil groove. FIG. 1... Trochanter, 2... Spherical part, 3...
...Shaft hole, 4...Cylindrical pusher, 5...
... Concave groove, 7 ... Race, 8 ... Oil groove, 9 ... Housing.

Claims (1)

[Claims] 1. A trochanter having at least a portion of a spherical surface is fitted into a cylindrical bushing for the race, and by pressing this bushing, the inner surface is plastically deformed to correspond to the spherical surface of the trochanter, thereby forming a trochanter. In the manufacturing method of a rotatable joint in which the race is rotatably held and the race is fitted into a housing such as a rod and caulked, the outer peripheral surface of the cylindrical bush has a shape that approximately corresponds to the spherical surface of the trochanter. A concave arc surface is formed so that the outer surface becomes approximately straight when it is deformed by pressing, and a plurality of concave grooves are carved in the axial direction or bias on the inner surface of the bush. An oil groove is formed on the inner surface of the race that intersects with the rotating direction of the trochanter, and a circumferential groove for caulking is formed in the center of the inner surface of the mounting hole of the housing, so that when the race is press-fitted, the thin midsection of the race is A manufacturing method characterized by forming a circumferential groove as an oil groove on the inner surface of the race as a result of the bulging, while bulging into the circumferential groove and caulking.