Dual-Bearing Output Shaft Layout for Stable Electric Tool Torque
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Solution Overview
Problem
Existing electric tools experience instability in operations due to radial and thrust loads applied to the tip tool and driving unit, leading to potential eccentricity and frictional forces in the transmission mechanism.
Innovation Solution
The electric tool incorporates a dual-bearing system, where the output shaft is supported by both a second bearing and a cover, which contacts the transmission mechanism, along with a regulating structure to stabilize the output shaft, reducing eccentricity and frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bearing supports the output shaft, then the structure is simple, but operational stability deteriorates under radial and thrust loads
Solution Approach 1:
The single bearing support is segmented into two separate bearings: a first bearing that supports the output shaft from one side and a second bearing that supports the output shaft from the other side. This segmentation allows each bearing to handle specific load components, improving overall operational stability while maintaining reasonable structural complexity
Solution Approach 2:
The cover acts as an intermediary element that houses both bearings and provides a stable mounting structure. The cover mediates between the bearings and the external environment, protecting the bearing assembly while maintaining precise alignment under varying load conditions
2Ease of repair
If the bearing is positioned away from the transmission mechanism, then maintenance is easier, but torque transmission stability deteriorates
Solution Approach 1:
The first and second bearings are nested within the cover structure, which itself is integrated into the tool housing. This nested arrangement allows the bearings to be positioned optimally for torque transmission while remaining accessible through the cover for maintenance purposes
Solution Approach 2:
The cover serves multiple functions: it houses the bearings, provides structural support, facilitates maintenance access, and maintains precise alignment. This multi-functionality resolves the contradiction by making the bearing assembly both maintenance-friendly and torque-stable
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
This configuration stabilizes the torque value and reduces operational instability by minimizing eccentricity and frictional forces, ensuring consistent performance even under varying load conditions.
Implementation Method 1
The first bearing and the second bearing are arranged to support the output shaft (6) rotatably
Data Source
AI summary
An electric tool includes a motor, an output shaft, a transmission mechanism, a first bearing and a second bearing, and a cover. The output shaft is to be coupled to a tip tool. The transmission mechanism is engaged with the output shaft to transmit torque generated by the motor to the output shaft. The first bearing and the second bearing support the output shaft rotatably. The cover houses the motor, the transmission mechanism, the first bearing, and the second bearing. The first bearing is interposed between the second bearing and the tip tool. The second bearing is arranged to be in contact with the transmission mechanism and the cover in a region where the transmission mechanism is engaged with the output shaft.