Arc Stop-Block Overrunning Clutch for High-Torque Low-Wear Transfer
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Solution Overview
Problem
Existing overrunning clutches face limitations in withstanding high torques, experiencing wear issues, and having short service life due to structural characteristics, leading to reduced reliability and performance, especially in high-speed and high-load applications.
Innovation Solution
A lower pair arc stop-block overrunning clutch design featuring an annular first rotating ring, a second rotating ring, a friction block assembly with arc wedge surfaces and cambered-surface stop surfaces, a propeller assembly, and elastic elements that allow unidirectional rotation and wedging, enhancing torque transmission and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If higher-pair transmission (point or linear contact) is used to increase torque capacity, then torque transmission capability is improved, but serious heating phenomenon occurs and service life is reduced
Solution Approach 1:
The patent employs arc-shaped friction blocks with curved contact surfaces instead of point or linear contact. The arc friction blocks create面接触 (surface contact) between the friction blocks and the drive/driven elements, distributing the contact pressure over a larger area. This curvature-based design transforms the contact geometry from higher-pair (point/linear) to lower-pair (surface) transmission, effectively reducing heat concentration while maintaining torque transmission capability.
2Force
If higher-pair transmission is used to increase torque capacity, then torque transmission capability is improved, but service life is reduced due to wear
Solution Approach 1:
The arc-shaped friction blocks with curved contact surfaces create lower-pair transmission that distributes wear over a larger surface area. This curvature-based design transforms the contact geometry from higher-pair (point/linear) to lower-pair (surface) transmission, significantly reducing wear rate and extending service life while maintaining torque transmission capability.
Solution Approach 2:
The patent changes the contact geometry parameter from point/linear contact to surface contact through the arc-shaped design. This parameter change transforms the transmission pair from higher-pair to lower-pair, fundamentally altering the wear characteristics and service life without sacrificing torque capacity.
3Force
If wedge angle is decreased to improve wedging performance, then wedging capability is improved, but wear resistance deteriorates and working life reduces
Solution Approach 1:
The patent replaces the traditional wedge shape with arc-shaped friction blocks that have curved contact surfaces. This curvature-based design allows the friction blocks to engage through surface contact rather than edge contact, distributing the wedging force over a larger area and reducing localized wear, thereby extending working life while maintaining effective wedging performance.
4Area of stationary object
If the number of rollers is increased to increase stress area in roller overrunning clutch, then stress area is increased, but service life in high load situations remains limited
Solution Approach 1:
The patent employs arc-shaped friction blocks that create extensive surface contact areas through their curved geometry. A single arc friction block can provide a larger effective contact area than multiple rollers, and the lower-pair transmission mechanism ensures that this area is utilized more effectively, resulting in improved service life under high load conditions.
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
The design achieves improved torque capacity, sensitive reaction, and ultra-long service life with reduced heat generation, making it suitable for high-speed and high-torque applications without compromising reliability.
Implementation Method 1
an elastic element, two ends of the elastic element being respectively fixed on the end surfaces of two adjacent friction blocks
Implementation Method 2
the outer surface of the friction block is provided with an arc wedge surface... a wedge assembly always contacting the first rotating ring and the arc wedge surface simultaneously
Data Source
AI summary
The invention discloses a lower pair arc stop-block overrunning clutch comprising an outer rotating element, an inner rotating element, a friction block assembly, a wedge assembly, a first propeller assembly, a first elastic element and a synchronized push-block assembly, wherein a plurality of friction blocks of the friction block assembly are connected end to end and arranged between a first rotating ring and a second rotating ring; an drive element drives the first propeller assembly to press the synchronized push-block assembly to achieve synchronization of the friction block assembly; the first propeller assembly is stationary relative to the friction block assembly, the friction block assembly is pushed to rotate reversely with a driven element; the wedge assembly is wedged to generate a radial pressure on the friction block assembly so that the friction block assembly can achieve lower pair arc stop, thereby achieving the transfer of torque.