Cam Opening Mechanism With Split Sliding Contact for Wear Control
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Solution Overview
Problem
Conventional opening and closing mechanisms experience reduced sliding torque and increased rattling due to early wear of the sliding portions, as the same areas of the members are constantly in contact.
Innovation Solution
The mechanism incorporates a cam member and a rotating portion with first and second cam projections on different circumferences, allowing the projections to slide over specific angles of the rotating portion, thereby distributing the sliding load and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same sliding portions are used continuously, then the mechanism maintains simple structure, but the sliding portion wears early causing reduced sliding torque and rattling
Solution Approach 1:
The cam member is divided into multiple sliding portions (first sliding portion and second sliding portion) that can independently contact the rotating portion at different rotation angles. This segmentation allows different portions to share the wear load, preventing any single portion from wearing out prematurely while maintaining the overall simplicity of the mechanism.
Solution Approach 2:
The cam member is designed to dynamically switch between different sliding portions based on the rotation angle of the rotating portion. As the rotation angle changes, the contact point transitions from the first sliding portion to the second sliding portion, creating a dynamic wear distribution system that adapts to the operational cycle and extends the service life of the sliding interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the wear resistance of the sliding portions, maintaining the sliding torque over a longer period and reducing rattling, thus improving the overall durability and performance of the opening and closing mechanism.
Implementation Method 1
the cam member being configured to apply a load to rotation of the rotating portion... the first cam projection and the second cam projection slide over the sliding face
Data Source
AI summary
An opening/closing mechanism includes: opening/closing member including rotating portion on rotation axis; and cam member to face the rotating portion of the opening/closing member on the rotation axis and to apply a load to rotation of the rotating portion. One of the cam member and the rotating portion includes: at least one first-cam-projection provided on first circumference having the rotation axis as center; and at least one second-cam-projection provided on second circumference having the rotation axis as center, with the second circumference being larger in radius than the first circumference. The other member includes sliding face over which the first and second cam projections slide. The opening/closing mechanism has: first-angle-range in which the first-cam-projection slides over the sliding face and the second-cam-projection does not slide over the sliding face; and second-angle-range in which the second-cam-projection slides over the sliding face and the first-cam-projection does not slide over the sliding face.