Rotary Feedthrough With Floating Coupling for Axle Eccentricity
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Solution Overview
Problem
Rotary feedthroughs with a radial arrangement of stator and rotor assemblies in tire pressure control systems are prone to leaks and damage due to axle shaft deformations, which cause radial displacement and eccentricity, leading to functional impairments.
Innovation Solution
A rotary feedthrough design with a rotor assembly comprising a rotor part at a radial distance from the axle shaft, connected via a driver in a torque-locking manner, and centered by a bearing, decoupling radial movements through a floating kinematic coupling, using a guide element in a coupling recess to compensate for axle shaft eccentricities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a radial arrangement of stator and rotor assemblies is used in a rotary feedthrough, then the installation space is reduced and mounting is simplified, but the system becomes sensitive to axle shaft deformations causing leaks and seal damage
Solution Approach 1:
The rotor assembly is designed with dynamic compensation capabilities to adapt to radial displacements and eccentricities of the axle shaft. The rotor can float radially within defined limits while maintaining sealed contact with the stator, allowing the system to accommodate deformation without compromising seal integrity.
Solution Approach 2:
The clearance and tolerances in the radial arrangement are specifically optimized to accommodate expected axle shaft deformations. By adjusting geometric parameters such as the radial clearance between rotor and stator, the system maintains reliable sealing despite positional variations caused by load-induced deformations.
2Power
If the rotor assembly is directly connected to the axle shaft, then torque transmission is direct and efficient, but radial movements and eccentricities cause functional impairments and potential failure
Solution Approach 1:
A bearing is introduced as an intermediary element between the rotor assembly and the axle shaft. This bearing allows the rotor to rotate with the axle shaft while simultaneously accommodating radial displacements and eccentricities, thus maintaining both efficient torque transmission and functional reliability under varying load conditions.
3Force
If higher loads are applied to the axle shaft, then the vehicle can carry greater weight, but axle deformations increase leading to radial displacement and eccentricity of the rotation axis
Solution Approach 1:
The rotor assembly incorporates floating radial mounting that allows dynamic adjustment to accommodate axis misalignment. This enables the system to maintain proper sealing and function even when the axle shaft experiences load-induced deformations and eccentricities, effectively decoupling load capacity from alignment precision requirements.
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 design ensures the rotary feedthrough remains insensitive to axle shaft deformations, preventing seal damage and leaks by decoupling radial movements, thus maintaining functional integrity.
Implementation Method 1
the rotor part (7) is centered with respect to the stator assembly (5) via a bearing (16), which is arranged between the stator assembly (5) and the rotor part (7) at an axial distance from the driver (8)
Implementation Method 2
at least one sealed or sealable annular transmission channel is located between the rotor assembly and the stator assembly, through which channel, for the purpose of tire pressure control, a pathway for transmitting a gas from the stator assembly to the rotor assembly and/or vice versa is provided
Data Source
AI summary
A rotary feedthrough as part of a tire pressure control system of a vehicle, comprising a rotor assembly which can be connected in a torque-locking manner to an axle shaft of the vehicle carrying a wheel and a stator assembly which is arranged in a stationary manner in relation to the rotational movement of the rotor assembly. At least one sealed or sealable annular transmission channel is arranged between the rotor assembly and the stator assembly, through which channel, for the purpose of tire pressure control, a pathway for transmitting a gas from the stator assembly to the rotor assembly and/or vice versa is provided. The rotor assembly comprises a rotor part which is arranged at a radial distance from the outer surface of the axle shaft with the rotor-side pathways required for the rotary transmission of a gas, and a driver which can be connected to the axle shaft in a torque-locking manner and which is engaged in a floating manner in the radial direction for the transmission of a rotary movement from the axle shaft to the rotor part. The rotor part is centered with respect to the stator assembly via a bearing, which is arranged between the stator assembly and the rotor part at an axial distance from the driver.