Cam Pin Transmission Mechanism With Segmented Pin Groups
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Solution Overview
Problem
Existing transmission mechanisms experience motion transmission errors due to speed differences between pins caused by polygonal motion of link plates and wear issues with stepped pins in contact with annular grooves, leading to reduced longevity.
Innovation Solution
A transmission mechanism featuring a cam with positive curvature and divided pins grouped based on local maximal values, where each pin is guided by a corresponding guide hole and engages with a gear, restricting speed differences within each group and reducing motion transmission errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If all pins are coupled by link plates to form a roller link chain, then the structure maintains rigidity and transmits motion, but speed differences between pins interfere with each other causing motion transmission errors
Solution Approach 1:
The pin series are divided into multiple independent groups, where pins within each group are coupled by link plates but different groups remain independent. This segmentation isolates speed differences within each group, preventing interference between groups and reducing cumulative motion transmission errors while maintaining structural rigidity within each segment.
2Ease of operation
If stepped pins contact annular grooves to guide motion, then the mechanism achieves motion conversion, but wear of stepped pins is facilitated reducing longevity
Solution Approach 1:
Guide holes in the guide plate are introduced as intermediary elements to constrain pin motion. Instead of direct contact between stepped pins and annular grooves, the guide holes provide a controlled path that reduces wear on the stepped pins while maintaining effective motion conversion functionality.
3Reliability
If pins are arranged along the side surface of cam with positive curvature, then motion transmission is achieved, but speed differences between pins cause interference and transmission errors
Solution Approach 1:
By dividing the pin series into multiple independent groups arranged along the cam surface, speed differences within each group are isolated and cannot interfere with other groups. This maintains reliable motion transmission from the cam while eliminating the interference problem that would occur with a fully coupled pin chain.
Data Source
AI summary
The present invention provides a transmission mechanism that enables a reduction in motion transmission error between an input-shaft side and an output-shaft side. A transmission mechanism is provided with a cam, a plurality of pins arranged along a side surface of the cam, guide plates in which a plurality of guide holes are provided, and gears capable of engaging the pins. In conjunction with rotation of the cam, each pin is guided by the corresponding guide hole and moves along the cam and the gears, thereby causing the guide plates or gears to rotate relative to the cam. The plurality of pins are divided into a plurality of groups, and the pins in each group are coupled in series, but are not coupled to the pins in the other groups.