One Way Clutch Retainer with Variable Biasing for Low Temp Engagement
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Solution Overview
Problem
One way clutches in automatic transmissions fail to engage torque transmission members effectively in low temperature environments due to high viscosity automatic transmission fluid, leading to sliding issues and decreased efficiency.
Innovation Solution
A one way clutch design featuring torque transmission members and biasing members with varying spring constants and mount positions, allowing for reliable engagement in low temperatures without increasing dragging torque, utilizing concave cams and cylindrical surfaces to facilitate oil film breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stronger biasing force is exerted on the torque transmission member to increase pressure on contact surfaces, then oil film breaking is facilitated, but dragging torque during idle rotation increases
Solution Approach 1:
The retainer is provided with multiple mount portions at different radial positions, allowing different biasing forces to be applied to different torque transmission members. Specifically, some mount portions are positioned closer to the rotational axis while others are farther away, creating local variations in biasing force strength. This enables selective enhancement of engagement reliability in critical areas without uniformly increasing dragging torque across all torque transmission members.
2Reliability
If the biasing member is made stronger to facilitate oil film breaking in low temperature, then engagement is improved, but abrasion of torque transmission member and ring increases
Solution Approach 1:
Different biasing forces are applied to different torque transmission members based on their specific positions and functional requirements. By strategically placing mount portions at varying radial distances, the invention creates a differentiated biasing scheme where only certain torque transmission members experience stronger forces necessary for low-temperature engagement, while others maintain lower forces to reduce abrasion and extend service life.
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
Ensures reliable torque transmission engagement in low temperature environments without increasing dragging torque during idle rotation, enhancing the clutch's performance and efficiency.
Implementation Method 1
biasing members that bias the torque transmission members respectively against the cam surfaces
Implementation Method 2
it is necessary for the oil film between the torque transmission member and the contact portions of the inner ring and the outer ring to be broken so that direct contact of the metal parts is achieved
Implementation Method 3
torque transmission members provided between the outer circumferential surface of the inner ring and the aforementioned cam surfaces
Data Source
AI summary
One way clutch has an inner ring, an outer ring and torque transmission members between the inner ring and the outer ring. Each torque transmission member can shift between a torque transmission position and a non torque transmission position. The one way clutch further has biasing members that bias the torque transmission members respectively toward the torque transmission positions, and a retainer that retains the torque transmission members and the biasing members. The retainer includes first and second mount portions that retain the torque transmission members and the biasing members corresponding thereto. Each of the first and second mount portions has a securing portion that secures one end of the biasing member, and the torque transmission member is pressed by the other end of the biasing member. The biasing force that the biasing members retained by the second mount portions exert on the torque transmission members corresponding thereto is larger than the biasing force that the biasing members retained by the first mount portions exert on the torque transmission members corresponding thereto.