Eccentric Transmission for Compact High-Force Pipe Presses
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Solution Overview
Problem
Existing power tools with hydraulically driven linear actuators are complex, large, heavy, inefficient, and require long working cycles, limiting their effectiveness in deformation and cutting processes.
Innovation Solution
The power tool incorporates an eccentric transmission device with a drive eccentric, eccentric gear, and compensating coupling to transmit torque efficiently, eliminating the need for a hydraulically driven actuator, allowing for a more compact, efficient, and faster working cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a hydraulically driven linear actuator is used, then high pressing forces can be generated, but the device becomes complex, large, heavy, and requires long working cycles
Solution Approach 1:
The patent extracts and eliminates the hydraulic system from the power tool, replacing it with a direct mechanical transmission system. The hydraulic pump, hydraulic lines, and hydraulic actuator are removed, and instead a threaded spindle drive is used to convert rotary motion directly into linear motion at the pressing head, achieving high pressing forces without hydraulic complexity
Solution Approach 2:
The patent replaces the hydraulic mechanical system with a direct mechanical transmission system. The threaded spindle drive mechanism converts rotational motion from the motor directly into linear motion at the pressing head through mechanical threads, eliminating the need for hydraulic fluid power transmission while maintaining the ability to generate high pressing forces
2Force
If a hydraulically driven linear actuator is used, then high pressing forces can be generated, but the device size and weight increase
Solution Approach 1:
The patent removes the heavy hydraulic components including the hydraulic pump, hydraulic reservoir, hydraulic lines, and hydraulic actuator from the power tool. The replacement mechanical threaded spindle drive system significantly reduces overall device weight while maintaining the capability to generate high pressing forces through direct mechanical advantage
3Force
If a hydraulically driven linear actuator is used, then high pressing forces can be generated, but the working cycle duration increases
Solution Approach 1:
The patent implements continuous useful action through the direct mechanical transmission system. The threaded spindle drive allows the pressing head to move continuously through the full range of motion without the delays associated with hydraulic system response time, pressure building, and fluid compression, thereby reducing the overall working cycle duration while maintaining high pressing forces
4Power
If a transmission is used to reduce motor torque requirements, then the motor can be dimensioned smaller, but the device complexity increases
Solution Approach 1:
The patent makes the threaded spindle drive serve multiple functions: it acts as both the transmission mechanism to reduce motor torque requirements and the linear actuator to generate pressing forces. This multi-functionality eliminates the need for separate transmission and actuator systems, reducing overall device complexity while allowing the use of a smaller motor
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 eccentric transmission device reduces complexity, size, weight, and cycle duration while achieving high transmission ratios, enhancing handling and efficiency.
Implementation Method 1
the eccentric transmission device comprises a drive eccentric (14), which is drivable by the drive (8), an eccentric gear (15), which is drivable by the drive eccentric (14)
Implementation Method 2
it can be possible for an involute toothing to be present between a ring gear, which is fixedly connected to a housing, and the eccentric gear
Implementation Method 3
The linear actuator (13) comprises substantially a compression spring (25) and a thrust rod (26)
Data Source
AI summary
Power tool, in particular a pipe press, including a drive, an output shaft, a threaded spindle drive and a linear actuator, wherein a torque generated by the drive is transmissible via the output shaft, and the threaded spindle drive connected to the output shaft, to the linear actuator. The power tool includes an eccentric transmission device for a torque adaptation between the drive and the threaded spindle drive, wherein the eccentric transmission device includes a drive eccentric, which is drivable by the drive, an eccentric gear, which is drivable by the drive eccentric, and a compensating coupling, which is drivable by the eccentric gear and which serves for transmitting torque from the eccentric gear to the output shaft.