Transmission Joint Boot With Recessed Roller Bearings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing protective boots for transmission joints risk deformation and failure to ensure clean and immediate assembly of shafts with roller arms due to point contact with internal shoulders, leading to dislodgment and incomplete assembly strokes.
Innovation Solution
A bellows-type protective boot with an internal peripheral shoulder featuring angularly offset recesses that provide a concave bearing surface for roller contact, distributing forces over an enlarged area to prevent deformation and ensure clean assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal peripheral shoulder is provided in the boot to prevent roller dislodgment, then the rollers are prevented from being dislodged during assembly, but the shoulder deforms when rollers come into contact with it, preventing clean and immediate assembly
Solution Approach 1:
The internal peripheral shoulder is modified by providing recesses at specific locations where rollers make contact. This creates localized bearing surfaces with different geometric properties (recesses with bearing surfaces) compared to the rest of the shoulder (even surface). The localized modification prevents deformation at contact points while maintaining the overall shoulder structure for roller retention.
Solution Approach 2:
The recesses in the internal peripheral shoulder are designed with curved bearing surfaces that match the curvature of the rollers. This curved geometry distributes the contact force over a larger area and allows the rollers to roll smoothly into position, preventing the sharp-pointed contact that causes deformation and enabling clean, immediate assembly.
2Ease of operation
If the internal peripheral shoulder has an even surface to allow free roller movement, then rollers can roll freely without obstacles, but contact occurs at a point only, causing shoulder deformation
Solution Approach 1:
Rather than making the entire shoulder surface uneven or adding complex structures, recesses are provided only at the specific locations where rollers make contact. The majority of the shoulder surface remains even to allow free roller movement, while the localized recesses provide distributed contact areas to prevent deformation.
Solution Approach 2:
The recesses are designed with curved bearing surfaces that conform to the roller geometry. This curvature transforms point contact into surface contact, distributing the load across the recess bearing surface and preventing shoulder deformation while maintaining smooth roller rolling motion.
Data Source
AI summary
A boot for protecting the male and female elements of a transmission joint, one element is formed by a transmission shaft having radial arms for carrying rollers, the other is formed by a bell housing suitable for at least partially receiving the rollers suitable to be inserted into the bell housing's open end, the boot, has an elongate hollow body enabling the shaft to pass there through, with a “first” one of its ends suitable for being secured to the shaft, and its “second” end suitable for being positioned in overlapping and interfitting manner over the bell housing's open end. This boot has an internal peripheral shoulder, whose surface that faces towards the second end of the boot is provided with at least two recesses which open towards the second end, the inside of each recess forming a seat having a concave bearing surface for receiving a roller in thrusting contact.