SU969994A1 - Method for assembling spherical joint - Google Patents

Description

(54) METHOD FOR ASSEMBLY OF BALL JOINT

The invention relates to mechanical engineering and can be used in the assembly of ball-joint joints of machine parts, for example, for connecting a subjoint with a piston or a piston with a connecting rod in axial-piston hydraulic machines.

A known method of assembling a ball joint by plastic shaping is rolling over the axle bearing onto the piston sphere of axial-piston hydraulic machines. A fully machined and jointly ground on spherical surfaces and a piston are connected by sealing the ball head of the piston into the body of the supporting body by squeezing a supporting subhead, and the end face is parallel to the support surface of the supporting flange 1 for technological considerations.

The disadvantage of the known method is the presence of a stress concentrator in the zone of the highest intensity, i.e. in the interface area of the outer surface and the end.

The presence of a stress concentrator in the zone of greatest stress subjected to cyclic loading leads to premature

the occurrence of fatigue cracks in ska, which reduces the durability of the hinge.

The purpose of the invention is to increase the hinge length of the track by reducing the magnitude of circumferential stresses in rolled-up skew.

This goal is achieved by the fact that in the method of assembling a dwarf by

10 installations in the housing with a ball head with a shank rolled by the sky. and the subsequent compression of the roller rolled on the head on the head, before compression on the end of the roller rolled on the speed

15, the bevel is made in the direction of its outer surface at an angle, ensuring that the end of the cage is located after crimping perpendicularly to the longitudinal axis of the body.

20

FIG. 1 shows a ball joint; in fig. 2 — node 1 in FIG. 1 (cross section of the roll along the subframe after compression,

25 solid main line) 1

The initial position before compression is shown by a dash-dotted line. Before compression, the end face of the ska takes the AB-position at an angle to the side

Claims (1)

30 outer surface. After compression, the end face of the skus takes the position AB - normal to the longitudinal axis (a dashed line is shown to compare the position of the end in the case of a known method with the formation of a stress concentrator in the form of an AFD angle). The method of assembling the ball joint is as follows. Pre-fabricate the cusp 1 with the spherical surface 2 and wedge 3, which are subject to subsequent compression, while trimming the end face 4. The ska is performed with a bevel toward the outer surface (in the direction opposite to its opposite). displacement during firing) at an angle ot. Next, a ball head 5 is made. After the spherical surfaces of the head and body are lapped, the ball head is inserted into the body and compressed by pressing through a forming matrix, while the juice rolled up is plastically deformed and comes into contact with the ball head. Performing the bevel at the end of the rolled track provides, after compression, the location of the end face in the plane normal to the longitudinal axis of the body (position AB in FIG. 2). The angle od is determined from the relation. , R- 01. arctg t where R is the radius of the sphere of the body; h - height rolled by ska. The ratio was established by calculation on the basis of considering the geometric dependencies of the elements. At the same time, the necessary condition was the location of the end along the sc after the squeezing is normal to the longitudinal axis of the body. Such an arrangement of the topua rolled across the axis is most favorable with respect to the direction of action of circumferential stresses, since its inclination towards the outer or inner surface leads to the formation of a stress concentrator in the form of an acute angle on the interface of the end face, respectively those. the location of the end after swaging in the plane normal to the longitudinal axis corresponds to the direction of action of circumferential stresses in the ska, which ensures a reduction in circumferential stresses compared to other end positions by reducing the height and sharpness of stress concentrators . According to the conditions of manufacturing technology, a chamfer or radius rounding (not shown) is performed on the interface of the butt to the inner and outer surfaces. The economic effect is achieved by increasing the operating time to repair and reducing losses from simple equipment associated with failures of the hinge case rolled through the casing. The invention of the method of assembling a ball joint by inserting a ball head with a shank into a housing with a roller ball and then crimping the shaft head rolled onto one another so that, in order to increase durability by decreasing circumferential stresses in rolled over ska, before crimping at the end of the rolled over ska, the bevel is made in the direction of its outer surface at an angle, ensuring the location of the end of the ska after crimping perpendicular to the longitudinal axis of the body. Tide into account in the examination 1. machined piston assembly axial-piston pumps IA under conditions of serial production. ., NIIMash, 1969, p.4 (prototype).