Hydrostatic Cam Ring with Uniform Outer Diameter
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Solution Overview
Problem
Existing hydrostatic machines face challenges in compactness and manufacturing complexity, particularly when integrated into vehicle wheels, due to the difficulty in producing stators with cam tracks and the need for robust yet ductile materials to withstand hydraulic pressure and wear.
Innovation Solution
A hydrostatic machine design featuring a stator with an internal cylindrical surface of constant diameter, a cam ring made of high-wear-resistant bearing steel, and a tubular casing of ductile material, allowing for simplified assembly and reduced production costs by decoupling the cam track's function from structural holding, and utilizing anti-rotation fixings and seals for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cam track is integrated into the stator body, then the structural strength is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The cam track is separated from the stator body and integrated into a独立的cam ring component. This segmentation allows the cam ring to be manufactured separately using specialized processes (such as sintering or casting) optimized for cam track geometry, while the stator body can be produced using standard manufacturing methods. The cam ring is then mounted onto the stator body, combining the benefits of optimized cam track manufacturing with robust structural support.
2Ease of manufacture
If a single material is used for both structural support and wear resistance, then the material selection is simplified, but the performance in both aspects cannot be optimized simultaneously
Solution Approach 1:
The invention employs different materials for the cam ring and stator body to optimize both wear resistance and structural strength. The cam ring, which requires high wear resistance, can be made from specialized materials such as sintered metal composites or hardened steel optimized for contact with pistons. The stator body, requiring structural support and ductility, can be made from a different material suitable for withstanding hydraulic pressures and providing mechanical support. This material differentiation allows each component to be optimized for its specific functional requirements.
3Manufacturing precision
If the stator internal surface includes positioning elements for bearings, then the bearing positioning is improved, but the compactness of the machine is reduced
Solution Approach 1:
The cam ring serves multiple functions: it provides the cam track for piston interaction, acts as a positioning element for the bearings through its mounting structure, and contributes to the overall structural integrity. By integrating the bearing positioning function into the cam ring's mounting interface with the stator body, separate positioning elements are eliminated, reducing the number of components and maintaining compactness while ensuring precise bearing positioning.
Data Source
AI summary
A hydrostatic machine comprising a stator and a rotor. The stator comprises an inner cylindrical surface with a constant diameter and a cam ring comprising a cam track on the inner circumference thereof, the outer circumference of the cam ring being mounted in the aforementioned inner cylindrical surface. The hydrostatic machine also comprises two bearings that allow the rotation of the rotor in relation to the stator and that are mounted on the inner cylindrical surface of the stator, axially on either side of the cam ring, the cam ring and the two bearings having the same outer diameter.