Wheel Bearing Seal Assembly With Speed-Adaptive Slinger Deformation
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Solution Overview
Problem
Conventional seal assemblies for wheel bearings experience increased frictional resistance at high speeds, leading to reduced fuel economy due to the constant pressure of sealing lips against the sealing plate, which does not adapt to varying vehicle speeds.
Innovation Solution
A seal assembly with a deformation unit comprising a first and second spring with different stiffness, positioned between the internal and external sides of the wheel bearing, allowing the slinger to deform according to vehicle speed, thereby adjusting the sealing lips' pressure and reducing frictional resistance at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing lips are pressed against the sealing plate to ensure sealing performance, then sealing performance is improved, but frictional resistance increases and fuel economy deteriorates at high speeds
Solution Approach 1:
The sealing assembly is designed to dynamically adjust the pressing force of sealing lips against the sealing plate based on rotational speed. At low speeds, springs maintain strong pressing force for reliable sealing. At high speeds, centrifugal force causes the slinger to move outward, reducing the pressing force and thereby reducing frictional resistance and energy loss.
Solution Approach 2:
The pressing force parameter of the sealing lips is changed according to operating conditions. The spring force provides constant pressing force at low speeds, while at high speeds the centrifugal effect modifies this parameter by reducing the contact pressure between sealing lips and sealing plate, optimizing the balance between sealing performance and energy efficiency.
2Reliability
If a rigid seal structure is used to ensure sealing performance, then sealing reliability is improved, but fuel economy deteriorates due to constant frictional resistance at high speeds
Solution Approach 1:
The seal structure transitions from a rigid, constant-pressure design to a dynamic design where the slinger and sealing lips can move relative to each other. The springs provide the necessary elastic force while allowing the assembly to respond to centrifugal forces at high speeds, creating a dynamically adaptive sealing system rather than a static one.
3Reliability
If sealing lips are constantly pressed against the sealing plate, then sealing performance is maintained, but frictional resistance increases under high-speed driving conditions
Solution Approach 1:
The sealing mechanism uses dynamic adjustment through the slinger-spring assembly. At high speeds, the centrifugal force moves the slinger outward, which dynamically reduces the contact pressure between sealing lips and sealing plate, thereby reducing frictional resistance while maintaining adequate sealing performance.
Solution Approach 2:
The contact pressure parameter between sealing lips and sealing plate is varied with operating speed. Springs provide the base pressing force, but at high speeds the centrifugal effect changes this parameter by reducing contact pressure, optimizing the trade-off between sealing performance and frictional resistance.
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 seal assembly ensures effective sealing at low speeds while minimizing drag and improving fuel economy at high speeds by adjusting the sealing lips' pressure in response to changing vehicle speeds through the differential deformation of the springs.
Implementation Method 1
a deformation unit including a first spring and a second spring mounted on the slinger, and allowing the slinger to deform according to a vehicle speed
Implementation Method 2
allowing a seal structure to vary according to a vehicle speed, thereby ensuring sealing performance at low speeds, and improving fuel economy at high speeds
Implementation Method 3
as the plurality of sealing lips are pressed against the sealing plate, a frictional force between the sealing lips and the sealing plate increases
Data Source
AI summary
A seal assembly for a wheel bearing, may include a core facing an internal side of a wheel bearing assembly; a slinger disposed to face an external side of the wheel bearing assembly; a sealing member fixed to the core, and having a plurality of sealing lips selectively pressed against the slinger; and a deformation unit including a first spring and a second spring mounted on the slinger, and allowing the slinger to deform according to a vehicle speed, wherein the first spring and the second spring are disposed to be parallel to each other.