Rotary Tool Impact Attenuation via Driven Member Bearing
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Solution Overview
Problem
Existing rotary tools experience wear and vibration issues due to the direct contact between the spindle and driven gear, leading to reduced durability and improper meshing, which is exacerbated by the use of impact attenuation mechanisms that require torque transmission through a C-shaped torque transmission member.
Innovation Solution
A rotary tool design that incorporates an impact attenuation mechanism between the driven member and the spindle, utilizing a resilient torque transmission member, and a third bearing to support the driven member, reducing surface pressure and wear by allowing the driven gear to rotate relative to the spindle, thereby attenuating start shocks and minimizing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a small clearance is provided between the support hole and spindle to minimize displacement, then assembly ease is improved, but wear between the support hole and spindle increases
Solution Approach 1:
A bearing is introduced as an intermediary component between the spindle and the driven gear's support hole. The bearing supports the spindle and transmits rotational motion to the driven gear while isolating the direct contact between the spindle and support hole, thereby reducing wear on both components.
2Power
If the driven gear is rotatably supported on the spindle with small clearance, then torque transmission is achieved, but vibration and improper meshing occur due to wear
Solution Approach 1:
The bearing serves as a mediator that maintains proper alignment and rotational support between the spindle and driven gear, ensuring accurate meshing and reducing vibrations while allowing torque transmission to proceed.
3Reliability
If impact attenuation mechanism is added to reduce start shock, then motor durability is improved, but device complexity increases
Solution Approach 1:
The bearing is positioned and configured to provide cushioning and attenuation of impact shocks before they can cause damage to the motor and gear components, absorbing the shock during the engagement phase of the reduction gear train.
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
The solution effectively reduces wear and vibration, improving the durability of the electric motor by minimizing surface contact pressure and preventing adhesion, while also attenuating start shocks, thus enhancing the overall performance and longevity of the rotary tool.
Implementation Method 1
the torque transmission member resiliently deforms in the radial direction, so that a start shock is absorbed while the drive torque is transmitted from the driven-gear to the spindle via the torque transmission member
Data Source
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AI summary
A rotary tool (1) includes a drive device (2), a driven member (17) configured to be rotatably driven by the drive device (2), a spindle (11) rotatably supported within a housing (12), an impact attenuation mechanism (30) disposed between the driven member (17) and the spindle (11) and transmitting rotation of the driven member (17) to the spindle (11) while an impact applied to the driven member (17) being attenuated, and a driven member support bearing (19) rotatably supporting the driven member (17), so that the driven member (17) can rotate relative to the spindle (11).