Hydraulic Rotary Union Housing for Protected Torque Motor Feedthrough
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Solution Overview
Problem
Existing torque motors for excavators are bulky, complex, and expose hydraulic conduits to mechanical stress and external impact, limiting their range of use and requiring complex production processes.
Innovation Solution
A compact, adaptable device with a hydraulic oil feedthrough system that surrounds the torque motor, featuring a housing with rotating parts and securing mechanisms to protect conduits from mechanical stress and leakage, allowing easy mounting and retrofitting of conventional torque motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydraulic conduits are routed externally to torque motor, then installation is simple, but conduits are exposed to mechanical stress and external impact
Solution Approach 1:
The hydraulic conduits are nested within the hollow shaft of the torque motor, with the conduit running through the internal cavity of the shaft. This nesting arrangement protects the conduit from external mechanical stress and impact while maintaining a compact structure that does not complicate installation.
2Volume of moving object
If torque motor design is integrated with hydraulic feedthrough, then structure is compact, but production becomes complex and device becomes heavy
Solution Approach 1:
The device is segmented into modular components: the torque motor shaft with integrated hollow conduit, the piston assembly with radial bore, and the sealing system. This segmentation allows each component to be manufactured separately using standard processes, then assembled together, maintaining compactness while reducing production complexity.
Solution Approach 2:
The shaft serves multiple functions: it transmits torque, provides a hollow passage for hydraulic conduits, and acts as a structural support. The piston with radial bore also serves dual purposes as both a sealing element and a conduit passage. This multi-functionality reduces the number of separate components needed, simplifying production while maintaining compact structure.
3Adaptability or versatility
If conventional torque drives are used with lateral oil stuffing box, then torque motor function is maintained, but conduits are unprotected from external impact
Solution Approach 1:
The hydraulic feedthrough function is merged with the torque motor shaft by integrating the hollow conduit directly into the shaft structure. This combination eliminates the need for separate lateral oil stuffing boxes while providing inherent protection against external impact, as the conduit is enclosed within the shaft's structural walls.
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 enhances the range of application for torque motors by providing a flexible, protected hydraulic oil feedthrough system that is easy to install and remove, reducing the risk of mechanical damage and leakage while maintaining a compact design.
Implementation Method 1
a hydraulic rotary union for transferring the hydraulic oil
Implementation Method 2
the axial movement of the piston, which can be pressurized with a pressure medium via corresponding pressure chambers, is converted into a rotation of the motor shaft
Implementation Method 3
the motor shaft is usually in screw engagement with the piston, which in turn is non-rotatably guided relative to the housing
Data Source
AI summary
The invention relates to a device (10) for conducting hydraulic fluid from a first connection (42, 44) to a second connection (38, 40) via at least one conduit (56, 58), having a housing comprising a first housing part (10a) having the first connection (42, 44) and a second housing part (10b) having the second connection (38, 40), which parts can be rotated relative to each other about an axis of rotation (10c) and have a hydraulic rotating union for transferring the hydraulic oil, and securing means (50, 52) are provided for securing the device (10) laterally to a torque motor (20), which comprises a first part (20a) and a second part (20b) that can be pivoted relative to the first part (20a), said first housing part (10a) having a central housing (66), said second housing part (10b) having a central body (68), and said central housing (66) and said central body (68) mutually engaging and being rotatably mounted relative to each other. The invention is characterised in that at least one of the conduit arms (64, 70, 72) extends substantially radially away from the central housing (66) and from the central body (68), in relation to the axis of rotation (10c), and in that the second housing part (10b) comprises securing means (52) which are associated with the second part (20b) of the torque motor (20).