Dual Speed Reducer Transmission Layout for Compact Heavy-Load Drives
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Solution Overview
Problem
Construction machinery, such as excavators, face challenges in achieving mechanical strength while reducing the size of drive transmission devices due to heavy loads, particularly in coupling portions, which are exacerbated by the use of electric actuators with large speed changers.
Innovation Solution
A drive transmission device with two speed changers aligned in the same rotation axis direction, distributing load and arranged in a space-saving manner, utilizing a differential unit and eccentric oscillating type speed reducers to enhance mechanical strength and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single large speed changer is used to withstand heavy loads, then mechanical strength is sufficient, but the device size becomes large
Solution Approach 1:
The patent divides the single large speed changer into two smaller speed changers arranged in parallel. Each speed changer handles a portion of the total load, allowing the use of smaller, more compact units while collectively maintaining the required mechanical strength. The two speed changers are coupled to the same input shaft and output shaft, creating a segmented load-bearing structure.
2Strength
If the speed changer is made large to withstand heavy loads, then mechanical strength is sufficient, but the arrangement space increases
Solution Approach 1:
The patent arranges the two speed changers in a spatial configuration where they are positioned at different angular positions around the input shaft axis. This three-dimensional arrangement allows the speed changers to be compactly positioned without requiring excessive planar area, effectively utilizing the radial and axial dimensions to minimize the overall footprint while maintaining load-bearing capacity.
3Strength
If two speed changers are provided to distribute load, then mechanical strength is sufficient, but the device complexity increases
Solution Approach 1:
The patent designs both speed changers with identical structures and configurations, allowing them to perform the same function of reducing rotational speed and transmitting torque. This universality simplifies the overall system design, as both units can be manufactured using the same blueprint and maintenance procedures, offsetting the complexity increase from having two units through standardization.
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 configuration provides sufficient mechanical strength and resistance to overloads while minimizing the device's size, improving the durability and efficiency of the drive transmission system.
Implementation Method 1
The two speed changers each include at least one crankshaft that receives the rotation of the input shaft and rotates about another rotation axis parallel to the rotation axis direction of the input shaft. The two speed changers may function as eccentric oscillating type speed changers that each decelerate the rotation of the crankshaft and transmit the decelerated rotation to the output shaft
Data Source
AI summary
A drive transmission device according to one embodiment of the disclosure includes a single differential unit to which rotation of a motor is transmitted and two speed reducers each having an operation output shaft that is coupled to the differential unit and a carrier that changes a speed of the rotation of the operation output shaft and outputs the rotation. The two speed reducers are arranged such that they are opposed to each other along a second rotation axis, and the operation output shaft and the carrier in each speed reducer are aligned in the second rotation axis direction.