Sealing Device Deformation Member Pressure Torque Control
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Solution Overview
Problem
Conventional sealing devices experience significant internal pressure fluctuations due to changes in the relative positional relationship between the fixed and rotating seal members, leading to increased torque on the rotary shaft, particularly in differential devices with substantial thrust movement.
Innovation Solution
Incorporating a deformation member with higher elasticity than the rotating seal member on the opening connecting the lip and axial dust lip of the fixed seal member, which deforms based on pressure to mitigate pressure rises and reduce torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid rotating seal member and fixed seal member are used to seal between the rotary shaft and housing, then the sealing performance is improved, but the torque given to the rotary shaft increases significantly when internal pressure fluctuates
Solution Approach 1:
The invention introduces a deformation member that changes its physical state (from rigid to deformed) in response to pressure changes. When internal pressure increases, the deformation member elastically deforms to increase the gap between sealing surfaces, thereby reducing contact pressure and torque while maintaining sealing effectiveness
Solution Approach 2:
The deformation member acts as an intermediary element between the rigid rotating seal member and the fixed seal member. It mediates the interaction by absorbing pressure fluctuations through elastic deformation, preventing direct transmission of high contact forces to the rotary shaft
2Adaptability or versatility
If the relative positional relationship between fixed and rotating seal members changes due to thrust movement or temperature change, then the adaptability to different operating conditions is improved, but the internal pressure fluctuates remarkably
Solution Approach 1:
The invention transforms the static sealing structure into a dynamic one by introducing the deformation member that can adapt its configuration in response to changing operating conditions. The deformation member's elastic properties allow it to dynamically adjust the sealing gap based on temperature-induced expansion or thrust-induced positional changes, thereby stabilizing internal pressure
3Reliability
If the contact pressure between dust lips and sealing surfaces increases to improve sealing, then the sealing effectiveness is improved, but the torque given to the rotary shaft increases
Solution Approach 1:
The deformation member dynamically changes the contact pressure parameter in response to internal pressure changes. When internal pressure rises, the deformation member deforms to reduce contact pressure between dust lips and sealing surfaces, thereby reducing torque while maintaining sufficient sealing effectiveness under normal operating 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 deformation member effectively suppresses pressure increases and corresponding torque rises, enhancing the sealing device's ability to maintain internal pressure stability and extend its operational life.
Implementation Method 1
a deformation member is disposed on the opening of the rotating seal member that has higher elasticity than the rotating seal member, blocks the opening, and deforms based on the pressure in the space
Data Source
AI summary
A sealing device between a shaft hole formed on a housing and a rotary shaft, is provided with a rotating seal member fixed to the rotary shaft that rotates integrally with the rotary shaft, and a fixed seal member fixed to an inner surface of the shaft hole. The fixed seal member has a lip contacting the rotary shaft and an axial dust lip contacting the rotating seal member. The rotating seal member is formed by a rigid body, and an opening is formed on the rotating seal member connecting to a space defined by the rotary shaft, the lip and the axial dust lip of the fixed seal member, and the rotating seal member. A deformation member is disposed on the opening of the rotating seal member that has higher elasticity than the rotating seal member, which blocks the opening, and deforms based on the pressure in the space.