Fixed universal joint

Abstract

The invention discloses a fixed universal joint. The fixed universal joint comprises a shell, an inner wheel and balls. Outer ball ways which are arranged at intervals around the axis are arranged onthe inner surface of the shell. A shaft hole is formed in the inner wheel along the axis. Inner ball ways arranged at intervals around the axis are arranged on the outer surface of the inner wheel. The inner ball ways correspond to the outer ball ways, the corresponding inner ball ways and the outer ball ways form ball ways, and balls are embedded in the ball ways. The adjacent ball ways are oppositely arranged in direction and shape with the axial direction of the outer shell or the inner wheel as a reference, so that when the fixed universal joint rotates, the stress borne by the shell and the inner wheel is no longer concentrated on the rotation axis between the outer shell and the inner wheel, the possibility of cracking or damage caused by the stress borne by the shell and the inner wheel is reduced, and the reliability of the whole fixed universal joint is improved.

Description

technical field [0001] The invention relates to a universal joint for vehicles, in particular to a fixed universal joint. Background technique [0002] The constant velocity drive shaft is a mechanism that connects two shafts whose axes do not coincide, and makes the two shafts transmit motion at the same angular velocity. requirements. [0003] The existing constant velocity drive shaft includes a first universal joint installed at the wheel end, an intermediate shaft and a second universal joint installed at the gearbox end, and the two ends of the intermediate shaft are connected with the first universal joint and the second universal joint respectively. Connection; in order to meet the needs of the wheel angle, the first universal joint is usually a fixed universal joint, which is a spherical rotating structure, which is fixed in the axial direction and takes the center of the ball as the center of rotation; The axial length of the shaft varies, usually with a movable ...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the existing structure is that the adjacent ballways are set at intervals with the axis as the center, the shape of each ballway and its axial setting are completely consistent, and the centers of all balls are basically in the same plane, forming a ball center distribution surface , when the inner wheel and the shell rotate, the axis of rotation passing through the center of the sphere divides the distribution surface of the sphere into two halves, the balls on one half face move toward the port of the shell, and the balls on the other half face the shell of the shell The balls move in the bottom direction, and the balls in these two directions cause the outer shell and inner wheel to receive the largest cumulative steering stress near the rotation axis, especially when the fixed universal joint has a large rotation angle, the outer shell and inner wheel are easily cracked or cracked due to large stress. Deformation, resulting in the failure or damage of the entire constant velocity drive shaft and shortening the life. In order to avoid this situation, it is necessary to increase the size of the outer casing and inner wheel or increase the stress level of the material, which not only increases the manufacturing of the entire universal joint The cost will also reduce the scope of application of fixed universal joints to a certain extent

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