Integrated Motor Pulse Unit for Electric Torque Tools
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Solution Overview
Problem
Conventional torque delivering impulse tools experience increased gap and backlash between interconnected parts due to manufacturing tolerances and operational wear, leading to reduced efficiency and shorter tool life.
Innovation Solution
The motor and pulse unit are rigidly assembled as an integrated rotatable structure without play, using a splined coupling and central bearing to ensure no movement between the rotor and inertia drive member, reducing the need for additional bearings and minimizing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motor and pulse unit are interconnected by means of hexagonal or quadratic male and female connection parts, then assembly is simplified, but a gap and backlash are inevitably formed between the interconnected parts
Solution Approach 1:
The rotor and inertia drive member are merged into a single integrated structure, eliminating the separate male and female connection parts. This integration removes the gap and backlash that inevitably exist between interconnected parts, while maintaining ease of assembly through the unified design.
2Ease of manufacture
If individually bearings are used for motor and pulse unit, then each component can be independently assembled, but considerable backlash and elasticity are introduced into the system
Solution Approach 1:
By combining the rotor and inertia drive member into one integrated structure, the patent eliminates the backlash and elasticity that result from using separate bearings for each component. The unified structure ensures precise torque transmission while still allowing for practical assembly procedures.
3Ease of operation
If a hexagonal joint with small radial dimensions is used, then the motor bearing can be assembled outside the shaft, but angular backlash of typically some degrees is introduced
Solution Approach 1:
The integration of the rotor and inertia drive member eliminates the need for a hexagonal joint with small radial dimensions. The unified structure allows for direct bearing assembly without introducing angular backlash, thereby maintaining both ease of operation and angular alignment precision.
4Adaptability or versatility
If the rotor and inertia drive member are assembled one at a time into the supporting structure, then assembly flexibility is maintained, but the hexagonal joint must have enough backlash to allow parts to slide together
Solution Approach 1:
By merging the rotor and inertia drive member into a single integrated structure, the patent eliminates the need for backlash in the connection joint. This maintains assembly flexibility through the unified design while significantly improving joint rigidity by removing the sliding interface that requires backlash.
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 enhances the tool's durability, efficiency, and specific torque output, while reducing weight and heat generation, resulting in a more reliable and compact design.
Implementation Method 1
an electric torque delivering motor (12) with a rotor (14) that is arranged to rotate with respect to a stator (13)
Implementation Method 2
mounted as one single unit inside said housing... minimizing friction
Data Source
AI summary
An electric torque delivering impulse tool includes a housing with a front end and a back end, an electric torque delivering motor with a rotor that is arranged to rotate with respect to a stator, an output shaft arranged at the front end of the housing, and a pulse unit intermittently coupling the motor to the output shaft, wherein the pulse unit includes an inertia drive member that is connected to the rotor. The rotor and the inertia drive member are rigidly assembled to each other without play so as to form one integrated rotatable structure which is mounted as one single unit inside the housing.