Electric Tool Dual-Bearing Support for Stable Torque Transmission
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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 eccentricity and frictional forces in the transmission mechanism.
Innovation Solution
The electric tool incorporates a transmission mechanism supported by a first and second bearing, with the second bearing in contact with the cover, and a regulating structure to stabilize the output shaft, reducing eccentricity and frictional forces by distributing applied loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single bearing supports the output shaft, then the structure is simple, but radial loads cause eccentricity and operational instability
Solution Approach 1:
The output shaft support is segmented into two separate bearings: a first bearing supporting the output shaft at one location, and a second bearing supporting the transmission mechanism and output shaft at another location. This segmentation distributes the radial load across multiple support points, reducing eccentricity and improving operational stability without excessive complexity.
2Force
If radial load is applied to the tip tool and driving unit, then the tool can perform work, but frictional forces increase and stability decreases
Solution Approach 1:
The second bearing acts as an intermediary element between the transmission mechanism and the output shaft. It mediates the radial load by providing an additional support point that reduces the frictional forces between the transmission mechanism and output shaft, thereby maintaining stability while preserving radial load capacity.
3Reliability
If the second bearing contacts the transmission mechanism and cover, then frictional forces are reduced, but the structure becomes more complex
Solution Approach 1:
The second bearing serves multiple functions simultaneously: it supports the output shaft rotatably, supports the transmission mechanism, and reduces frictional forces between these components. This multi-functionality justifies the additional structural complexity by delivering multiple benefits from a single structural arrangement.
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
Stabilizes torque values and reduces frictional forces in the transmission mechanism, ensuring consistent and stable operation by distributing radial and thrust loads effectively.
Implementation Method 1
The first bearing and the second bearing are arranged to support the output shaft (6) rotatably
Data Source
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AI summary
The problem to be overcome by the present disclosure is to contribute to stabilizing operations. An electric tool (1) includes a motor (2), an output shaft (6), a transmission mechanism (3), a first bearing (8A) and a second bearing (8B), and a cover (10B). The output shaft (6) is to be coupled to a tip tool (11). The transmission mechanism (3) is engaged with the output shaft (6) to transmit torque generated by the motor (2) to the output shaft (6). The first bearing (8A) and the second bearing (8B) support the output shaft (6) rotatably. The cover (10B) houses the motor (2), the transmission mechanism (3), the first bearing (8A), and the second bearing (8B). The first bearing (8A) is interposed between the second bearing (8B) and the tip tool (11). The second bearing (8B) is arranged to be in contact with the transmission mechanism (3) and the cover (10B) in a region where the transmission mechanism (3) is engaged with the output shaft (6).