CV Joint Boot Cantilevered Can Design
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Solution Overview
Problem
Existing constant velocity joint boot designs for direct pinion mount systems face challenges such as increased grease pressure leading to boot deformation, limited boot axle length, and insufficient press fit contact, which result in boot failure modes like inversion and folding.
Innovation Solution
A boot assembly with a cantilevered second end portion having a planar portion extending at an angle, a radially outward end, and a boot can with a crimp head that reduces radial deformation through a gradual thickness decrease from an upper slope to a lower slope region, and a boot stopper to prevent radial deformation, along with a direct bond or vulcanization to the sleeve for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a direct pinion mount design is used with a larger sleeve diameter, then the joint angle capability is improved, but the grease pressure increases causing boot deformation
Solution Approach 1:
The boot thickness is varied locally across different regions to address the pressure distribution. The upper slope portion has greater thickness to resist high grease pressure, while the lower slope portion has reduced thickness. This local quality variation allows the boot to maintain structural integrity under pressure while accommodating the required joint angle capability.
Solution Approach 2:
The boot thickness parameter is changed across different regions of the boot. By transitioning from a uniform thickness design to a variable thickness design, the boot can better withstand the increased grease pressure in the direct pinion mount configuration while maintaining the necessary flexibility for joint movement.
2Adaptability or versatility
If the boot can inner diameter is increased to accommodate larger sleeve, then the joint angle capability is improved, but the boot becomes more prone to radial deformation
Solution Approach 1:
Different regions of the boot are given different thickness qualities to address the structural stability issue. The upper slope portion with greater thickness provides enhanced radial stiffness to prevent deformation, while the lower slope portion with reduced thickness maintains flexibility for joint operation.
Solution Approach 2:
The boot design incorporates a composite structure with varying thickness regions, effectively creating a composite material distribution that optimizes both structural stability and flexibility. The transition from uniform to variable thickness creates a composite-like structure that addresses the contradiction between size and stability.
3Device complexity
If the boot length is reduced due to nut interference, then the direct pinion mount design is simplified, but the press fit contact portion becomes insufficient
Solution Approach 1:
The boot thickness parameter is optimized to compensate for the reduced boot length. By increasing the thickness in critical regions, the boot maintains sufficient structural integrity and press fit contact despite the shorter axial length imposed by the nut interference in the direct pinion mount design.
Data Source
AI summary
A constant velocity joint boot assembly with a boot can having a first end portion connected to an outer race and a second end portion cantilevered from the outer race. The second end portion has a planar portion extending from the first end portion at an angle. A radially outward extending end extends from the planar portion. A boot has a first end and a second end. The first end has an inner surface that is directly connected to an inner surface of the planar portion of the boot can. A sleeve has one end portion connected to an inner surface of an inner race and a second end portion extending axially away from the inner race. The boot has a lower portion engaged with the sleeve.