Crown Ball Universal Joint Torque Distribution
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Solution Overview
Problem
Constant velocity universal joints in directional drilling experience significant mechanical wear due to the shifting torque transfer balls, which limits their operational life and efficiency in transmitting torque loads.
Innovation Solution
The CV joint design incorporates a crown ball with arced force transfer elements and a socket housing with partial-cylinder channels, increasing the effective load transfer arc by 15° to 75°, reducing radial force vectors, and enhancing the load distribution across the contact area, thereby increasing the joint's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CV joint design with torque transfer balls and race channels is used, then torque loads can be transmitted, but mechanical wear occurs significantly at the socket channels due to ball contact line shifting
Solution Approach 1:
The invention replaces the traditional linear race channels with arced force transfer elements that follow a curved path between the crown ball and socket housing. This curvature distributes the contact line across a broader arc (15° to 75°), preventing concentrated wear at any single location and significantly extending operational life.
2Power
If torque transfer balls shift along socket channels during rotation, then torque force can be transmitted from socket to drive shaft, but load distribution becomes concentrated at the contact line area
Solution Approach 1:
The invention transitions from a linear contact path to a two-dimensional arced contact surface. The force transfer elements are positioned along an arc rather than a straight line, distributing the torque load across multiple angular positions and improving overall load distribution while maintaining effective torque transmission.
Data Source
AI summary
A constant velocity universal joint is assembled as a crown ball meshed within a housing socket for rotation about respective rotational axes. The outside diameter of the crown ball is greater than the inside diameter of the socket. A plurality of channels, equally spaced around the crown ball perimeter are cut into the crown ball surface generally along or parallel with the crown ball drive axis. An arcuate cup is cut into each crown ball channel to confine a respective torque transfer element. A number, corresponding to the number of crown ball channels, of partial cylinder channels are cut into the inside surface of the housing socket. One of opposite side walls for each housing channel is given an arcuate radius corresponding to that of the force transfer elements. Ridges between adjacent crown ball channels mesh with ridges between adjacent housing socket channels. Torque transfer elements confined within said crown ball cups engage the partial cylinder wall of the housing channels to transfer drive forces between the crown ball and socket housing through a departure angle between the respective rotational axes.