Modular Hydraulic Compact Axle Assembly for Leak-Free Force Transmission
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Solution Overview
Problem
Existing hydraulic compact axles are difficult to assemble, require significant effort to adapt to customer requirements, and often lack the external shape of a conventional hydraulic differential cylinder while being prone to deformation and leaks under hydraulic forces.
Innovation Solution
The actuator, pump, and volume compensation assemblies are designed as separate units arranged in a row along the longitudinal axis, fastened in pairs at the ends, with threaded screw connections and centering devices for precise alignment and sealing, allowing for easy assembly and robust force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the compact axle is designed with many components incorporated into a long, slender outer tube, then the external shape resembles a conventional hydraulic differential cylinder, but the assembly becomes difficult and requires considerable effort to adapt to customer requirements
Solution Approach 1:
The compact axle is divided into separate modular assemblies (actuator assembly, pump assembly, motor assembly, volume compensation assembly) that can be manufactured independently and then connected. This segmentation allows each module to be optimized separately and facilitates easier assembly and adaptation to customer requirements while maintaining the overall cylindrical external shape.
2Ease of manufacture
If the actuator assembly is arranged laterally next to other assemblies, then the assembly can be constructed with separate components, but the actuator assembly alone must transmit hydraulic forces causing excessive deformation
Solution Approach 1:
The actuator assembly is permanently attached directly to the pump assembly, motor assembly, and volume compensation assembly, merging them into an integrated force transmission system. This combination allows hydraulic forces to be distributed across multiple structural components rather than being concentrated in the actuator assembly alone, reducing deformation while maintaining manufacturing feasibility.
3Reliability
If the reservoir volume is designed to be large, then the connection can seal off high pressures, but the compact axle loses its compact design and conventional external shape
Solution Approach 1:
The volume compensation assembly is nested within the cylindrical outer tube, with the reservoir integrated into the internal structure. This nesting approach allows the reservoir to be contained within the compact cylindrical form factor, maintaining both the conventional external shape and compact dimensions while providing sufficient volume for pressure sealing and hydraulic fluid storage.
4Volume of moving object
If the space around electrical components is used as an oil reservoir, then the reservoir can be positioned compactly, but the reservoir cannot be pressurized requiring large volume
Solution Approach 1:
The volume compensation assembly is extracted as a separate functional unit from the electrical component area. By dedicating specific structural spaces to hydraulic functions and separating them from electrical components, the reservoir can be properly pressurized and integrated into the force transmission path without compromising either hydraulic reliability or electrical component functionality.
Data Source
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AI summary
The invention relates to a hydraulic compact axle (10) comprising an actuator assembly (40), a pump assembly (50; 50'), a motor assembly (80), and a volume compensation assembly (90), which are each arranged concentrically with respect to a longitudinal axis (13). According to the invention, the actuator assembly (40), the pump assembly (50; 50'), the motor assembly (80) and the volume compensation assembly (90) are each designed as a separate assembly, preferably as an assembly which can be separately pre-assembled, wherein said assemblies (40; 50; 50'; 80; 90) are arranged in a row along the longitudinal axis (13), wherein they are attached to each other exclusively in pairs at the end faces, wherein the actuator assembly (40) is arranged at one end of said row.