Dynamic Pressure Seal Ring for Stable Sealing and Low Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional seal rings for automotive transmissions face challenges in stabilizing sealing performance while reducing rotation torque, as they have a limited contact area with the side wall of the annular groove, leading to potential decreases in sealing efficiency and instability.
Innovation Solution
A seal ring design featuring first and second dynamic pressure generation grooves on its outer peripheral surface, which generate dynamic pressure through relative rotation with the housing, combined with protrusions on the inner surface to stabilize the sliding area and reduce sliding resistance, ensuring consistent sealing performance and reduced rotation torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the contact area of the sliding portion between the seal ring and the side surface of the annular groove is reduced, then rotation torque is reduced, but sealing performance becomes unstable
Solution Approach 1:
The seal ring employs dynamic pressure generation grooves that utilize the relative rotation between the seal ring and housing to generate hydrodynamic pressure. This dynamic mechanism allows the seal ring to maintain stable sealing performance through fluid pressure rather than relying solely on mechanical contact, thereby reducing rotation torque while ensuring reliable sealing.
Solution Approach 2:
The invention uses hydraulic principles by incorporating dynamic pressure generation grooves that generate fluid pressure through relative motion. The fluid pressure acts on the seal ring to maintain contact with the sealing surface, providing stable sealing performance without requiring large contact areas, thus reducing friction and rotation torque.
2Loss of energy
If the contact area of the sliding portion is reduced to reduce rotation torque, then sealing performance may decrease in some use environments
Solution Approach 1:
The dynamic pressure generation grooves create hydrodynamic pressure that adapts to varying operating conditions. As the relative rotation speed and fluid pressure change, the dynamic pressure adjusts accordingly, ensuring stable sealing performance across different use environments without compromising by increasing contact area.
Solution Approach 2:
The invention changes the sealing mechanism from static contact-based sealing to dynamic fluid-pressure-based sealing. By utilizing parameters such as relative rotation speed and fluid pressure to generate dynamic pressure, the seal ring achieves adaptability across various operating conditions while maintaining low rotation torque.
3Ease of operation
If the contact region of the seal ring with the side wall surface is limited by gap dimensions and chamfer dimensions, then the contact area may be too small for stable sealing
Solution Approach 1:
The dynamic pressure generation grooves utilize hydraulic pressure to maintain reliable sealing. The fluid pressure generated through relative rotation acts on the seal ring, compensating for the limited contact area caused by gap and chamfer dimensions, thereby ensuring stable sealing performance without compromising sliding operation.
Solution Approach 2:
The invention introduces fluid pressure as an intermediary mechanism between the seal ring and the sealing surface. Instead of relying directly on mechanical contact between solid surfaces, the fluid pressure mediates the sealing action, allowing stable sealing with minimal contact area and enabling smooth sliding operation.
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 described configuration stabilizes sealing performance and reduces rotation torque by generating dynamic pressure and maintaining a consistent sliding area, even with varying annular gap sizes between the shaft and housing, thus enhancing the seal ring's efficiency and durability.
Implementation Method 1
a first dynamic pressure generation groove extending from a position close to a first side surface of the seal ring with respect to the center of width in an axial direction to the first side surface and configured to generate dynamic pressure with relative rotation between the housing and the seal ring
Data Source
AI summary
A seal ring capable of stabilizing sealing performance while reducing rotation torque. A seal ring 100 has a plurality of first dynamic pressure generation groove 131 and a plurality of second dynamic pressure generation groove 132 on an outer peripheral surface thereof with intervals in the circumferential direction, the plurality of first dynamic pressure generation groove 131 extending from a position close to a first side surface 100A with respect to the center of width in an axial direction to the first side surface 100A and configured to generate dynamic pressure with relative rotation between a housing and the seal ring 100, and the plurality of second dynamic pressure generation groove 132 extending from a position close to a second side surface 100B with respect to the center of width in the axial direction to the second side surface 100B and configured to generate dynamic pressure with the relative rotation between the housing and the seal ring 100.