Torque Transmission Device for Electric Tool Start Shock Attenuation
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Solution Overview
Problem
Existing electric tools with large electric motors experience insufficient start shock attenuation, leading to potential damage and reduced durability due to metallic fatigue in torque transmission members.
Innovation Solution
A torque transmission device comprising multiple C-shaped torque transmission members overlapping in a radial direction, allowing incremental resilient deformation to absorb start shock, dispersing the impact across multiple members to prevent fatigue breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single C-shaped torque transmission member is used to attenuate start shock, then the shock attenuation effect is insufficient for large-size electric tools, but increasing the thickness of the torque transmission member leads to metallic fatigue and damages
Solution Approach 1:
The patent divides a single thick torque transmission member into multiple thinner C-shaped members (first, second, and third torque transmission members) arranged in sequence. This segmentation allows the start shock to be distributed across multiple members, preventing any single member from experiencing excessive stress that would lead to metallic fatigue, while collectively providing sufficient shock attenuation for large-size electric tools.
Solution Approach 2:
The patent positions the multiple C-shaped torque transmission members in sequence within the torque transmission path between the electric motor and spindle. These members are designed to resiliently deform beforehand during startup, absorbing and attenuating the start shock before it reaches the spindle and working tool, thereby protecting the system from damage while maintaining member thickness within safe limits.
2Force
If the thickness of the torque transmission member is increased to improve shock attenuation, then the shock attenuation capability is enhanced, but the possibility of metallic fatigue and damages increases
Solution Approach 1:
The patent segments the shock absorption function across multiple C-shaped torque transmission members of manageable thickness. Each member contributes to the overall shock attenuation capability through its resilient deformation, achieving the required force absorption without any single member exceeding thickness limits that would predispose it to metallic fatigue.
Solution Approach 2:
The patent changes the configuration parameter from a single thick member to multiple thinner members arranged in sequence. This parameter change maintains or enhances the overall shock absorption capability (through cumulative deformation) while reducing the thickness of individual members, thereby improving their resistance to metallic fatigue and enhancing overall reliability.
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
Effectively absorbs and attenuates start shock in large electric tools, enhancing durability by preventing damage and reducing unpleasant sounds and vibrations, while maintaining a manageable thickness to avoid fatigue-related breakage.
Implementation Method 1
a C-shaped torque transmission member resiliently deformable in a radial direction may be interposed between two rotary elements in a torque transmission system. Therefore, when the rotational torque is transmitted from one to the other of the two rotary elements, the torque transmission member may resiliently deform in a radial direction
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An electric tool (1) may include an electric motor (3), a spindle (11) to which a working tool (15) may be attached, and a torque transmission path provided between the electric motor and the spindle and including a first rotary member (21) and a second rotary member (25). A torque transmission device (20) may be provided between the first rotary member and the second rotary member and may include a plurality of resiliently deformable torque transmission members (22, 23).