CV Joint Boot Inner Groove Structure for Crack-Resistant Sealing
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Solution Overview
Problem
Existing boots for sealing tri-lobe constant-velocity joints in vehicle drive trains are prone to cracking or seal failure due to their bulky fastening design, which can lead to connector breakage or sealing issues when fastened.
Innovation Solution
A boot design featuring a first fastening region with lobe and guide regions, including inner and outer grooves, and a pleated region, which distributes material thickness and force evenly to prevent cracking and ensure a robust seal, with inner grooves on the undersurface of the connector seat region and outer grooves that are parabolic in shape to support even force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the fastening region is designed with bulky material to compensate for tri-lobe contour differences, then the connector can be fastened securely, but the connector tends to crack or break during fastening
Solution Approach 1:
The fastening region is divided into multiple lobes (typically three) with varying material thicknesses. Each lobe corresponds to a recess in the joint housing, creating localized thickening zones that distribute fastening forces across multiple segments rather than concentrating stress in a single bulky region.
Solution Approach 2:
The boot exhibits non-uniform material thickness with localized thickening in lobe regions that align with joint housing recesses. This local quality variation allows the boot to provide enhanced support precisely where fastening forces are applied, while maintaining thinner material in non-critical areas to reduce overall bulk and stress concentration.
2Ease of operation
If parallel slots are provided in tri-lobe regions to accommodate connectors, then connectors can be fastened, but exposed ribs form between slots that may bend or break the connector
Solution Approach 1:
The boot provides localized material thickening in lobe regions that correspond to connector mounting positions. This local reinforcement occurs precisely where connectors attach to the joint housing, providing structural support to prevent rib bending or connector breakage during fastening operations.
Solution Approach 2:
The boot is pre-formed with integrated lobes and slots during manufacturing, so that the structural reinforcement is already in place before connector installation. This preliminary preparation ensures that connectors are fastened to a pre-reinforced structure rather than requiring additional strengthening steps.
3Adaptability or versatility
If material is thickened in tri-lobe regions to form bulges, then the seal can accommodate constant radius fastening regions, but the bulky design causes connector cracking
Solution Approach 1:
Instead of a single bulky thickening, the boot uses multiple discrete lobe regions with localized material accumulation. Each lobe corresponds to a specific recess in the joint housing, segmenting the thickening function across multiple locations to maintain compatibility with constant radius fastening while avoiding excessive bulk in any single area.
Solution Approach 2:
The lobe regions are formed with smooth curved transitions that match the spherical or rounded contours of constant radius fastening regions. This curvature compatibility allows the segmented lobes to work effectively with constant radius connectors, providing both adaptability and reduced stress concentration compared to sharp angular transitions.
Data Source
AI summary
A boot is provided with an improved sealing effect. The boot has a first and a second fastening region, and a pleated region between them, wherein the first fastening region comprises lobe regions and/or guide regions, and connecting regions and a connector seat region that has a connector seat region surface and an undersurface lying opposite it, wherein there is at least one inner groove in the lobe regions and/or in the guide regions, on the undersurface.