Multi-Piston Machine Dual-Valve Control for Three Displacement Volumes
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Solution Overview
Problem
Existing multi piston machines, such as radial piston motors, face challenges in achieving high energy efficiency, compact size, low torque ripple, and cost-effective manufacturing while providing multiple switchable displacement volumes.
Innovation Solution
A multi piston machine with at least three switchable non-zero displacement volumes is achieved through a configuration involving first and second control valves connected to fluid chambers and working ports, with specific distribution and connection patterns of control openings, and the use of staggered piston rows and dwell sections to minimize pressure peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple switchable displacement volumes are implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into two independent control valves (first control valve and second control valve) that operate separately to control different aspects of displacement switching. The first control valve manages the basic displacement switching while the second control valve provides additional displacement control, allowing the system to achieve three switchable non-zero displacement volumes without requiring a single complex multi-position valve
Solution Approach 2:
The control valve system uses a nested structure where the second control valve operates within the framework established by the first control valve. The control openings of the second control valve are distributed on a second circle that is offset from the first circle, creating a layered control architecture that enables multiple displacement volumes through coordinated operation of the two valves
2Volume of moving object
If compact size is achieved for wheel integration, then ease of installation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The control openings are arranged on circular paths (first circle and second circle) rather than linear arrangements. This circular distribution allows for compact radial packaging of the control mechanisms while maintaining precise angular spacing between control openings, facilitating wheel integration without compromising manufacturing precision
Solution Approach 2:
The second circle is offset from the first circle, creating an asymmetric control opening distribution pattern. This asymmetric arrangement optimizes the compactness of the overall machine structure for wheel integration while providing sufficient clearance and access for control mechanisms, balancing size reduction with manufacturing feasibility
3Reliability
If pressure peaks are minimized, then reliability is improved, but device complexity increases
Solution Approach 1:
The control openings are periodically distributed around the circular paths, with multiple control openings spaced at regular angular intervals. This periodic arrangement ensures that pressure changes are distributed evenly over time as the rotor rotates, preventing localized pressure peaks while maintaining a relatively simple control valve structure
Solution Approach 2:
Different control openings are positioned at specific angular locations on the first and second circles to optimize pressure distribution. The offset between the two circles allows certain control openings to open and close at different phases of rotor rotation, creating a staggered pressure profile that reduces peak pressures without requiring complex additional components
Data Source
AI summary
A multi piston machine includes a rotor, pistons, a first control valve, and a second control valve. The pistons abut against a cam surface with multiple lobes. The machine is switchable between at least three non-zero displacement volumes using the first and the second control valves. The first control valve is connected to a first and a third fluid chamber. The second control valve is connected to a second and a fourth fluid chamber. The first and the second control valve are connected to first and the second working port respectively. A third number of second control openings is twice a second number of the lobes. There is a first and a second group of the second control openings. Adjacent second control openings belong to a different first or second group. The second control openings of the first group are either connected to the first or the second fluid chamber.