Hard-Rolling Roller Asymmetry for Crankshaft Deep Rolling
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Solution Overview
Problem
Hard-rolling rollers in deep rolling tools often get improperly installed, leading to premature wear of the rollers and incorrectly machined crankshafts due to their shape, which allows them to be clamped in inverted positions.
Innovation Solution
A cylindrical body is integrated on the upper end surface of one of the central bodies of the hard-rolling roller, ensuring correct mounting by altering the support surface and distribution of deep rolling force to the truncated cone-shaped central bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hard-rolling roller has a torus-shaped base body with rounded edges, then the support surface is broadened and deep rolling force is distributed to central bodies, but the roller can be clamped in inverted positions causing premature wear and incorrect machining
Solution Approach 1:
The invention introduces asymmetry by providing a cylindrical body only on the upper end surface of one central body, making the roller's geometry non-symmetric. This asymmetric feature creates a unique support surface configuration that allows the roller to be correctly positioned only in one orientation within the cage, preventing inverted installation while maintaining the torus-shaped base body for force distribution
2Ease of manufacture
If the hard-rolling roller is designed with symmetric torus-shaped geometry, then manufacturing is simplified, but the roller lacks features to prevent improper installation
Solution Approach 1:
The invention maintains the simple torus-shaped base body for ease of manufacture but introduces a single cylindrical body feature on one central body to create asymmetry. This minimal asymmetric modification prevents improper installation without significantly complicating the manufacturing process, as it adds only one additional geometric feature to an otherwise simple design
Data Source
AI summary
The invention relates to a hard-rolling roller for a deep rolling tool having a torus-shaped base body for deep rolling of radiuses or recesses which limit the bearing trunnion on crankshafts on both sides, and two at least approximately truncated cone-shaped central bodies, rising on both sides of the body. A cylindrical body rises on the upper end surface of one of the two central bodies.