Resin Shaft Seal Spring Tip Geometry to Prevent Biting Damage
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Solution Overview
Problem
The existing sealing device may experience damage to the resin seal due to the plate spring biting into it during the insertion of the shaft, which can lead to compromised sealing performance.
Innovation Solution
The sealing device incorporates a biting-suppression structure at the distal end of the plate spring, which includes a bent portion that prevents the plate spring from biting into the resin seal by maintaining a separation between the plate spring and the resin seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plate spring is used to press the resin seal radially inward to prevent separation during axial eccentricity, then sealing reliability is improved, but the distal end of the plate spring may bite into the resin seal causing damage
Solution Approach 1:
The patent applies local quality by giving different properties to different parts of the plate spring. Specifically, the distal end portion is designed with a different structure (reduced thickness or rounded shape) compared to the main body, allowing it to maintain flexibility and prevent biting while the rest of the spring maintains sufficient stiffness for pressing the seal against the shaft during axial eccentricity.
Solution Approach 2:
The patent applies preliminary action by pre-forming the distal end portion of the plate spring with a specific structure before assembly. The distal end is manufactured with reduced thickness or rounded contours in advance, so that when the sealing device is assembled and operated, the modified distal end automatically prevents biting into the resin seal without requiring additional protective components.
2Force
If the plate spring is made stiffer to maintain pressing force on the resin seal, then sealing performance is improved, but the risk of biting into the resin seal during deformation increases
Solution Approach 1:
The plate spring is designed with local quality by creating a gradient in thickness or flexibility. The main body maintains high stiffness to provide sufficient pressing force, while the distal end portion has reduced thickness or rounded geometry that increases flexibility and reduces stress concentration, preventing biting during deformation while maintaining overall pressing capability.
3Object-affected harmful factors
If the plate spring is made more flexible to prevent biting, then damage to resin seal is reduced, but pressing force on the resin seal decreases
Solution Approach 1:
The solution uses local quality by creating a spatial variation in the plate spring's mechanical properties. The distal end portion is localized with reduced thickness or rounded shape to provide flexibility and prevent biting, while the main body retains full thickness and stiffness to maintain adequate pressing force on the resin seal throughout 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
This configuration effectively suppresses damage to the resin seal by preventing the plate spring from biting into it, thereby maintaining stable sealing performance and extending the lifespan of the sealing device.
Implementation Method 1
slidably in close contact with an outer surface of the shaft
Implementation Method 2
the plate spring being deformed, when the shaft is inserted, on the radially inward side to be curved along the resin seal
Data Source
AI summary
A sealing device in which damage on a resin seal by a plate spring can be suppressed is provided. The sealing device includes a metal ring 110, a resin seal 120 which is deformed on the radially inward side to be curved toward a sealed-region side and, in this state, slidably in close contact with an outer surface of a shaft 200, and a plate spring 130 which presses a radially inward side of the resin seal 120 radially inward, wherein, a bent portion 133 in which a part of a distal end of the plate spring 130 on the radially inward side is bent in advance so that the distal end of the plate spring 130 on the radially inward side is separated from the outer surface of the resin seal 120 in a state where the shaft 200 is inserted.