Rotating Pump Seal Axial Control via Plate Spring
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Solution Overview
Problem
Existing rotating pumping apparatuses with sealing mechanisms using resinous and rubber rings face issues where the friction between components is insufficient to prevent the sealing member from moving axially and rotating with the drive shaft, leading to leakage and inefficiency.
Innovation Solution
Incorporating a pressure member with a plate spring and rotation stoppers to elastically press the sealing member against a stopper wall, preventing axial movement and rotation without relying on torque from the drive shaft, thereby enhancing the sealing mechanism's effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the friction between the rubber ring and resinous body is increased to prevent axial movement, then the sealing effectiveness improves, but the complexity of the sealing mechanism increases and may cause excessive wear
Solution Approach 1:
A plate spring is introduced as an intermediary component between the resinous body and the pump casing. The plate spring elastically presses the resinous body against the stopper wall, providing the necessary axial restraining force without requiring complex friction-based mechanisms. This mediator simplifies the overall sealing mechanism while ensuring reliable axial position control.
Solution Approach 2:
The invention changes the parameter of axial force application from friction-based (contact between rubber ring and resinous body) to elastic force-based (plate spring pressing). This parameter change allows for controlled, consistent axial restraint that is independent of friction variations, improving reliability while maintaining simplicity.
2Device complexity
If the friction between components is relied upon to prevent rotation, then the device complexity remains low, but the reliability deteriorates when frictional forces are insufficient
Solution Approach 1:
Rotation stoppers are introduced as intermediary components that physically prevent rotation of the resinous body. These stoppers engage with corresponding features on the resinous body, providing positive mechanical restraint against rotation. This approach maintains relatively simple device complexity while dramatically improving rotation prevention reliability compared to friction-based methods.
3Reliability
If the pin hits the slant surface with sufficient force to prevent axial movement, then the sealing reliability improves, but the device complexity increases and the operation becomes less smooth
Solution Approach 1:
The axial force application method is changed from impact-based (pin hitting slant surface) to continuous elastic pressure (plate spring). This parameter change provides smooth, continuous axial restraint without the discontinuous impact forces, improving operational smoothness while maintaining reliable axial position control.
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 prevents axial movement and rotation of the sealing member, ensuring a hermetic seal and improving the operational reliability of the rotating pumping apparatus, even when frictional forces are insufficient, thus enhancing the braking system's performance.
Implementation Method 1
a plate spring, a first rotation stopper, and a second rotation stopper. The plate spring works to elastically press the sealing member against the stopper wall
Implementation Method 2
when the degree of friction, as developed between the rubber ring and the resinous body, is greater than the above force
Data Source
AI summary
A rotating pumping apparatus is provided which may be employed in an automotive brake system. The rotating pumping apparatus includes a sealing member and a pressure member. The sealing member is disposed around a pump drive shaft. The pressure member includes a plate spring, a first rotation stopper, and a second rotation stopper. The first rotation stopper serves to stop the pressure member from rotating following rotation of the pump drive shaft. The second rotation stopper engages the seal ring to stop the sealing member from rotating following the rotation of the pump drive shaft. The plate spring works to elastically press the sealing member against a stopper wall of a pump casing to stop the sealing member from moving in an axial direction of the pump drive shaft.