Pivotable Hydraulic Motor Hub Assembly Design
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Solution Overview
Problem
In large, powerful vehicles with all-wheel drive systems, flexible hydraulic hoses used in hub motors are subject to excessive stress and wear due to movement and steering, leading to short service lives and downtimes.
Innovation Solution
A compact and space-saving wheel hub unit design featuring a rotor unit with a large volume in the intermediate region between two spaced-apart stator elements, allowing for a massive and stable hydraulic connection system with large cross-sectional areas, and a connection unit with adjustable tension elements for secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rotor unit is made large in volume in the intermediate region between stator elements, then high hydraulic pressures can be absorbed and the connection can be made massive and stable, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The stator unit is divided into at least a first stator element and a second stator element with a distance between them, creating an intermediate region. This segmentation allows the rotor unit to be enlarged in volume within this region to absorb high hydraulic pressures while maintaining a compact overall structure through the distributed stator elements.
Solution Approach 2:
The invention utilizes the axial dimension by spacing stator elements apart along the axis of rotation, creating an intermediate region where the rotor unit can expand in volume. This dimensional approach allows the rotor to be enlarged without increasing the radial diameter excessively, enabling high pressure absorption while maintaining compactness in the radial direction.
2Power
If the hydraulic connections are made with large cross-sectional areas, then high hydraulic pressures and flow rates can be achieved, but the installation space requirement increases
Solution Approach 1:
The invention transitions from radial to axial dimensioning by spacing stator elements apart along the axis of rotation. This allows hydraulic connections with large cross-sectional areas to be implemented within the axial intermediate region, achieving high hydraulic power capability while maintaining a compact radial footprint and minimizing installation space requirements.
Solution Approach 2:
The rotor unit with enlarged cross-section in the intermediate region is nested within the space defined by the spaced-apart stator elements. This nesting allows large hydraulic connection channels to be accommodated within the compact hub motor structure without requiring additional installation space outside the motor assembly.
3Volume of moving object
If the stator elements are positioned close together, then the overall motor size is reduced, but the rotor unit cannot be sufficiently enlarged to handle high hydraulic pressures
Solution Approach 1:
The stator unit is segmented into multiple stator elements spaced apart along the axis of rotation, creating an intermediate region. This segmentation strategy allows the rotor unit to be selectively enlarged in volume within this intermediate region to handle high hydraulic pressures, while the overall motor remains compact due to the axial arrangement of stator elements rather than radial expansion.
Solution Approach 2:
The invention resolves the contradiction by utilizing the axial dimension for stator element spacing rather than requiring radial expansion. This allows the rotor unit volume to be increased in the axial intermediate region for high pressure handling while maintaining compactness in the radial direction, achieving both compactness and pressure capability simultaneously.
Data Source
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AI summary
A vehicle with, or a wheel hub unit for, a vehicle with a hydraulic drive unit comprising a hydraulic motor is proposed, wherein at least one pivoting and/or steering axis is provided for pivoting and/or steering the hydraulic motor, wherein the hydraulic motor has at least one motor housing, wherein the motor housing has a connection flange with at least one inlet and one outlet connection for pressurizing with hydraulic fluid, wherein a rotary feedthrough is provided for conveying the hydraulic fluid to/from the hydraulic motor, wherein the rotary feedthrough comprises at least one stator unit having at least one flange and a rotor unit rotatable about an axis of rotation relative to the stator unit, having at least two hydraulic connections for pressurizing with hydraulic fluid, which can be designed to be significantly more compact or space-saving in the case of high power or pressurization.This is achieved according to the invention by the stator unit having at least one first stator element having a first flange surface and one second stator element having a second flange surface, wherein a distance is provided between the two stator elements and/or flange surfaces in the direction of the axis of rotation.