Inner Race and Boot Sleeve Axial Fixation
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Solution Overview
Problem
Existing designs for connecting an inner race to a pinion shaft in constant velocity joints are complex and expensive, and fail to adequately prevent or reduce relative axial and rotational movement.
Innovation Solution
The connection involves an inner race with an elliptical cross-section and a boot sleeve with a complementary elliptical shape, along with a ring in a groove to axially fix the components, or a keyway and key for rotational fixation, or axially extending slots and prongs to prevent movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art designs are used to connect the inner race to the pinion shaft, then the connection structure is established, but the design becomes complex and expensive while failing to adequately prevent relative axial and rotational movement
Solution Approach 1:
The patent applies asymmetry by using an elliptical cross-section for the inner race instead of a conventional circular cross-section. This elliptical shape creates non-uniform contact with the boot sleeve, effectively preventing both axial and rotational relative movement through geometric constraint rather than complex mechanical fasteners
Solution Approach 2:
The connection is segmented into distinct functional elements: the elliptical inner race, the complementary elliptical boot sleeve, axial retention rings, and rotational retention keys. Each element performs a specific function, simplifying the overall design while maintaining effectiveness in preventing relative movement
2Reliability
If prior art designs are used to connect the inner race to the pinion shaft, then the connection structure is established, but the manufacturing cost increases
Solution Approach 1:
The elliptical cross-section, while geometrically asymmetric, is actually simpler to manufacture than complex multi-component connection structures. The elliptical shape can be produced using standard machining or forming processes, and the complementary elliptical boot sleeve provides automatic geometric alignment, reducing assembly complexity and cost
Solution Approach 2:
The elliptical geometry of the inner race and boot sleeve creates self-aligning and self-retaining characteristics. The shape itself provides the retention mechanism, eliminating the need for additional complex fastening components and reducing manufacturing steps
Data Source
AI summary
An inner race and boot sleeve combination is provided. The inner race has an inner surface with a groove formed therein. The boot sleeve has a groove in an outer surface. A ring is located in both grooves to axially secure the inner race and boot sleeve together. Devices to prevent relatively rotation between the inner race and the boot sleeve are also provided.