Sealing Ring Dynamic Pressure Grooves Torque Reduction
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Solution Overview
Problem
Sealing rings in automatic and continuously variable transmissions face challenges in reducing rotary torque and suppressing fluid leakage regardless of rotational direction.
Innovation Solution
A sealing ring with a dynamic pressure generating groove, featuring a first groove of constant width and a second groove extending to the inner circumferential surface, is mounted on a shaft to guide fluid and reduce pressure receiving area, generating dynamic pressure that counteracts rotary torque and prevents leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove for guiding fluid is provided on a sliding surface side of a sealing ring, then fluid leakage is suppressed, but rotary torque cannot be reduced regardless of rotational direction
Solution Approach 1:
The sealing ring is divided into multiple functional grooves: a sealing groove for preventing leakage and dynamic pressure generating grooves (first and second grooves) for reducing rotary torque. This segmentation allows each groove to perform its specific function independently, resolving the contradiction between leakage suppression and torque reduction.
Solution Approach 2:
Different regions of the sliding surface are given different properties through the groove configuration. The sealing groove provides leakage prevention at specific locations, while the dynamic pressure generating grooves create low-pressure zones at strategic positions to reduce rotary torque. This local differentiation allows simultaneous achievement of both objectives.
2Reliability
If the sealing ring contacts the side wall surface to maintain sealing, then fluid pressure is maintained, but rotary torque increases
Solution Approach 1:
The dynamic pressure generating grooves act as intermediaries that introduce fluid pressure management between the sealing ring and side wall surface contact. By guiding fluid into these grooves, a dynamic pressure effect is created that reduces the contact pressure and resulting rotary torque, while the sealing function is maintained through the sealing groove.
3Reliability
If fluid pressure acts on the sealing ring from both high and low pressure sides, then sealing force is maintained, but pressure receiving area increases rotary torque
Solution Approach 1:
The dynamic pressure generating grooves extract or remove fluid pressure from acting on the sealing ring by providing escape paths for high-pressure fluid. The first groove with constant width and the second groove extending to the inner circumferential surface work together to channel fluid away, reducing the effective pressure receiving area and thus reducing rotary torque while maintaining necessary sealing force.
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 solution effectively reduces rotary torque and suppresses fluid leakage across all rotational directions, enhancing sealing performance and durability under varying conditions.
Implementation Method 1
dynamic pressure is generated as the fluid to be sealed flows out from the first groove to a sliding portion
Implementation Method 2
the sealing ring slides against a side wall surface on a low pressure side of the annular groove
Data Source
AI summary
Provided is a sealing device capable of suppressing leakage of a fluid to be sealed while reducing rotary torque regardless of rotational direction. In a sealing ring (100) slides against a side wall surface on a low pressure side of an annular groove, a dynamic pressure generating groove (120) that includes a first groove (121) having a constant width in a radial direction and extending in a circumferential direction and a second groove (122) extending from a center position of the first groove (121) in the circumferential direction to an inner circumferential surface and guiding a fluid to be sealed into the first groove (121) is provided on a sliding surface side which slides against the side wall surface. The first groove (121) is provided at a position within a sliding region in which the sealing ring slides against the side wall surface.