Tangential Force Drive Motor With Pneumatic-Hydraulic Torque Transfer
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Solution Overview
Problem
Existing pneumatic motors, particularly pneumatic motors, face challenges in achieving efficient torque output across different applications, especially in vehicles, aircraft, and ships, due to high energy consumption and the need for high torque across the entire speed range.
Innovation Solution
A drive motor combining pneumatic and hydraulic transmission systems, utilizing identical drive and working pistons with opposing movements, synchronized by hydraulic fluid, to achieve high torque and efficiency through tangential force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic motors are used to achieve high power density and safe operation in explosive environments, then reliability is improved, but efficiency and torque consistency across the speed range deteriorate
Solution Approach 1:
The patent combines pneumatic drive with hydraulic transmission. Compressed air drives pistons in the first stage, which then hydraulically drive second-stage pistons. This hybrid approach maintains the safety advantages of pneumatic motors in explosive environments while significantly improving efficiency and torque consistency through the hydraulic transmission stage.
2Force
If pneumatic motors are used to deliver high torque at low speeds, then force output is improved, but efficiency across the entire speed range deteriorates
Solution Approach 1:
The motor is divided into two independent stages: a pneumatic drive stage with pistons and a hydraulic transmission stage with working pistons. Each stage can be optimized for its specific function - the pneumatic stage for high torque at low speeds and the hydraulic stage for efficiency across the entire speed range. The stages are connected through hydraulic fluid coupling.
Solution Approach 2:
The patent changes the fluid medium parameter from gas (pneumatic) to liquid (hydraulic) between stages. The pneumatic pistons drive hydraulic fluid, which then acts on the working pistons. This parameter change enables the system to maintain high torque while improving efficiency across different operating speeds.
3Device complexity
If traditional pneumatic motor designs are used, then simplicity is maintained, but torque consistency and efficiency across the speed range deteriorate
Solution Approach 1:
The pneumatic pistons serve dual functions: they are both the driven elements by compressed air and the driving elements for the hydraulic fluid. This multi-functionality reduces the need for separate coupling mechanisms and maintains relative structural simplicity while achieving improved efficiency.
4Power
If high power density is achieved through pneumatic drive, then power output is improved, but efficiency deteriorates due to energy loss in compression and expansion
Solution Approach 1:
The hybrid pneumatic-hydraulic system captures and utilizes the energy from compressed air more effectively. The pneumatic pistons convert pneumatic energy to mechanical motion, which then drives the hydraulic system. This two-stage energy conversion reduces energy losses compared to direct pneumatic drive.
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 drive motor provides high torque and efficiency across the entire speed range, reducing energy consumption and enhancing operational performance in vehicles, aircraft, and ships.
Implementation Method 1
The first fluid can be a pressurized gas, such as compressed air. The pressurized gas can be supplied to the first chamber of the first or second cylinder via at least one fluid inlet
Implementation Method 2
The second fluid can be a hydraulic fluid, such as a mineral oil- or water-based fluid. The first drive piston is fluidically coupled to a first working piston in a first working cylinder via the second fluid
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a drive motor, comprising a shaft (41) on which a drive element (400) is arranged, a first cylinder (9) with a first drive piston (3) movably arranged therein, and a second cylinder (10) with a second drive piston (4) movably arranged therein, wherein the first drive piston (3) is fluidically coupled to a first working piston (43) in a first working cylinder (35), the second drive piston (4) is fluidically coupled to a second working piston (29) in a second working cylinder (33), and the first and second working pistons (43, 29) move back and forth in opposite directions in the first and second working cylinders (25, 33) and are operatively connected to the drive element (400).The invention also relates to a method for operating the drive motor, a use of the drive motor for driving a motor vehicle, aircraft or ship and a motor vehicle, aircraft or ship containing the drive motor.