CV Joint Shaft Attachment Using Retaining Ring and Boot Band
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Solution Overview
Problem
Existing constant velocity universal joints for propeller shafts face challenges in securely fixing and easily separating the inner joint member from the power transmission shaft, with existing configurations either requiring complex design for slip-off prevention or increasing the number of parts and costs.
Innovation Solution
A constant velocity universal joint with an attaching and detaching mechanism comprising a cylindrical member, a radially movable fixing member, and an axially movable annular member, which securely fixes and separates the power transmission shaft from the inner joint member using a boot band for sealing and positioning, reducing the need for additional parts and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retaining ring with chamfer or roundness is used to prevent slip-off, then slip-off prevention performance is improved, but design and control complexity increases significantly
Solution Approach 1:
The patent introduces a retaining ring as an intermediary component between the power transmission shaft and the constant velocity universal joint. The retaining ring features a groove on its inner circumference that engages with a protrusion on the power transmission shaft, creating a simple mechanical interlocking mechanism that effectively prevents slip-off without requiring complex chamfer or roundness designs.
2Ease of operation
If a drive sleeve and drive nut configuration is used, then secure fixation and easy separation are achieved, but the number of parts and costs increase
Solution Approach 1:
The patent merges the functions of fixation and separation into a single retaining ring component. The retaining ring can be easily attached to secure the constant velocity universal joint to the power transmission shaft, and subsequently removed for separation, eliminating the need for separate drive sleeves and drive nuts while maintaining secure fixation and easy separation capabilities.
Data Source
AI summary
A constant velocity universal joint has an outer joint member and an inner joint member that transmits torque while permitting angular displacement due to balls between the inner and outer joint members. An attaching and detaching mechanism for attaching and detaching a power transmission shaft to and from the inner joint member is provided between the inner joint member and the power transmission shaft such that torque can be transmitted between the two. The attaching and detaching mechanism has a cylindrical member that fits over the power transmission shaft, a retaining ring that is radially movable, and an annular member that is axially movable. By using a boot band to fixedly tighten, to the power transmission shaft, a small diameter end portion of a boot closing an opening portion of the outer joint member, the axial position of the annular member is restricted by the small diameter end portion.