Gear Motor Adapter Bellows for Thermal Expansion and Oil Tightness
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Solution Overview
Problem
Conventional gear motors face challenges in maintaining consistent operation and oil tightness when exposed to variable temperatures, leading to potential disruptions in torque transmission and alignment issues due to thermally induced changes in shaft length.
Innovation Solution
A gear motor design featuring an adapter with a torsionally fixed bellows connection between the electric motor and gearing system, combined with a sealing ring for centering and oil tightness, which compensates for thermal expansion by maintaining torque transmission and preventing oil leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a rigid connection is used between the motor shaft and the input shaft, then torque transmission is efficient, but thermal expansion causes misalignment and disrupts operation
Solution Approach 1:
The patent employs a bellows component made of flexible material that connects the motor shaft to the input shaft. This bellows allows axial expansion and contraction due to thermal effects while maintaining torsional stiffness for reliable torque transmission. The flexible structure accommodates length changes without disrupting the operational alignment between shafts.
Solution Approach 2:
The patent utilizes the temperature-dependent parameter changes of the bellows material to accommodate thermal expansion. As temperature varies, the bellows changes its axial length while maintaining its torsional properties, thereby adapting to thermal conditions without compromising torque transmission or alignment.
2Reliability
If additional sealing measures are added to prevent oil leakage, then oil tightness is improved, but device complexity increases
Solution Approach 1:
The bellows component performs multiple functions simultaneously: it provides flexible connection for thermal expansion, maintains torsional stiffness for torque transmission, and acts as a sealing element preventing oil leakage. By integrating these functions into a single component, the patent avoids additional sealing measures and reduces overall device complexity.
Solution Approach 2:
The patent merges the sealing function with the flexible connection component (bellows). The bellows structure itself serves as the sealing element between the motor shaft and input shaft, eliminating the need for separate sealing components and simplifying the overall design.
3Stability of the object's composition
If the bellows is made stiffer in the axial direction to prevent compression, then alignment is maintained, but torque transmission is interrupted during thermal changes
Solution Approach 1:
The bellows is designed with anisotropic properties: flexible in the axial direction to accommodate thermal expansion while maintaining torsional stiffness for continuous torque transmission. This flexible membrane structure allows length changes without compromising the integrity of the power transmission path.
Solution Approach 2:
The bellows provides dynamic adaptation to thermal conditions by allowing axial movement while maintaining torsional connection. The structure transitions from a static rigid connection to a dynamic flexible connection that adapts to temperature changes while continuously transmitting torque.
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
Ensures continuous torque transmission and oil tightness by absorbing thermal changes in the bellows, while the sealing ring maintains alignment and prevents oil leakage, even with helical gearing, thus maintaining consistent operation across temperature fluctuations.
Implementation Method 1
Thermally induced changes in length of the motor shaft are absorbed by the bellows, which is stiffer in the circumferential direction than in the axial direction
Implementation Method 2
the elastic sealing ring compensates for alignment deviations of the shafts
Implementation Method 3
a sealing ring is situated between the adapter shaft and the input shaft
Data Source
AI summary
A gear motor includes a gearing system, an electric motor, and an adapter. The adapter is situated between the electric motor and the gearing system, the adapter has an adapter shaft, the adapter shaft is at least partially inserted into an input shaft of the gearing system, the adapter shaft is connected to the input shaft in a torsionally fixed manner with the aid of a bellows, and a sealing ring is situated between the adapter shaft and the input shaft.