Gear Mechanism Stopper Part Design for Tooth Tip Protection
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Solution Overview
Problem
In gear mechanisms, the existing stopper mechanisms using gear engagement can cause damage to tooth parts due to concentrated turning forces, leading to breaking, deformation, or cracking when the first gear is stopped by the second gear's stopper part.
Innovation Solution
A gear mechanism with a stopper part on the second gear that includes a protruded and recessed part, where the protruded part is radially outward and the recessed part is radially inward, allowing the first gear's tooth tip to abut the recessed part and distributing the turning force, reducing the likelihood of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stopper part is formed by filling up a valley part between tooth parts in the second gear, then the first gear can be stopped from turning further, but the turning force of the first gear is concentrated on the tooth tip part causing damage such as breaking, deformation and cracking
Solution Approach 1:
The stopper part is segmented into a protruded part and a recessed part, where the protruded part engages with the tooth flank and the recessed part supports the tooth tip, distributing the stopping force across multiple contact points rather than concentrating it on the tooth tip alone
Solution Approach 2:
Different portions of the stopper part have different functional qualities: the protruded part is designed to engage with the tooth flank for force transmission, while the recessed part is designed to support the tooth tip, creating localized functional zones that address different stress points
Data Source
AI summary
A gear mechanism may include a first gear, a second gear engaged with the first gear, and a stopper part formed in the second gear. The stopper part may be engaged with the first gear to prevent turning of the first gear. The stopper part is a part where a tooth is not formed in an outer peripheral part of the second gear. The stopper part includes a protruded part protruded to an outer side in a radial direction with respect to a tooth tip circle of a tooth part of the second gear, and a recessed part recessed to an inner side in the radial direction with respect to the protruded part and adjacent to the protruded part in a circumferential direction and, when turning of the first gear is stopped, a tip end side of the tooth part of the first gear is abutted with the recessed part.