Multi-Eccentric Roller Transmission for High Torque Balance
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Solution Overview
Problem
Conventional transmissions face challenges in achieving high transmission ratios, high torque, and torsional rigidity in a compact and stable manner, particularly when driven by electric motors.
Innovation Solution
A transmission design featuring a drive shaft with multiple eccentric regions of varying widths, offset in the circumferential direction, and rollers accommodated in a cage with radial freedom, utilizing a wedge-shaped groove and cam disk regions to minimize dynamic imbalance, allowing for high torque and transmission ratio while maintaining stability and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional transmission designs are used, then structural simplicity is maintained, but achieving high transmission ratio and high torque in compact space becomes difficult
Solution Approach 1:
The transmission is divided into multiple independent roller rows, each handling a portion of the total torque. This segmentation allows the design to achieve high total torque capacity while keeping each individual roller row compact, thereby resolving the contradiction between compact size and high power transmission.
Solution Approach 2:
The patent utilizes the axial dimension by arranging multiple roller rows axially offset from each other. This dimensional approach allows high torque transmission through multiple rows without increasing the radial footprint, thus achieving high power in compact space.
2Power
If multiple eccentric regions with differing widths are used to achieve high transmission ratio, then dynamic imbalance increases
Solution Approach 1:
The patent employs counterbalancing eccentric regions where the product of width and circumferential position cosine/sine components sum to zero. This anti-weight principle eliminates dynamic imbalance caused by multiple eccentric regions, allowing high transmission ratio without compromising stability.
3Ease of manufacture
If a single-piece cage structure is used, then manufacturing complexity is reduced, but achieving high torsional rigidity becomes more difficult
Solution Approach 1:
The cage is merged with the output shaft as a single-piece structure, eliminating assembly complexity while the integrated design inherently provides high torsional rigidity. This merging resolves the contradiction by achieving both ease of manufacture and high strength simultaneously.
4Ease of operation
If rollers are arranged with radial freedom in recesses, then smooth operation is improved, but device complexity increases
Solution Approach 1:
The rollers are designed with radial freedom to dynamically adapt to load variations and maintain optimal contact with cam disk regions. This dynamic arrangement smooths operation while the simplicity of the recess geometry keeps device complexity low.
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 design enables high torque and transmission ratio in a compact space with enhanced stability and reduced radial forces, ensuring smooth operation and balanced configuration.
Implementation Method 1
A drive shaft (1), e.g., a hollow shaft, of the transmission has multiple eccentric regions with differing widths in the axial direction, the high points of which are offset relative to one another in the circumferential direction
Implementation Method 2
Respective rollers are accommodated in respective recesses of a cage and arranged with a radial degree of freedom, e.g., radially movable back and forth
Implementation Method 3
by the output shaft having a wedge-shaped and/or V-shaped groove that is uninterrupted and/or fully circumferential in the circumferential direction, in which rolling bodies, e.g., cylindrical, barrel-shaped rolling bodies or spherical rolling bodies, are accommodated
Data Source
AI summary
A drive includes a transmission driven by an electric motor. A drive shaft of the transmission has multiple eccentric regions with differing widths in the axial direction, in which the high points thereof are offset relative to one another in the circumferential direction. The respective eccentric region is radially surrounded by a respective cam disk region, e.g., of a housing part of the transmission. Respective rollers are accommodated in respective recesses of a cage and arranged with a radial degree of freedom. The cage is rotationally fixed to the output shaft of the transmission. The output shaft along with the cage is rotatably mounted both relative to the cam disk regions and relative to the drive shaft. During operation, the respective rollers are made to roll and/or slide on the respective cam disk region by the respective eccentric region. The eccentric regions are arranged behind one another in the axial direction such that the dynamic imbalance is minimized and/or eliminated.