Power Tool Transmission Slip Clutch for Torque Blocking
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Solution Overview
Problem
Hand-held power tools can experience blocked operating states due to excessive torque, leading to potential damage to the transmission and tool holder, which existing designs fail to adequately prevent.
Innovation Solution
Incorporating a fixed ring gear with a breakaway torque less than or equal to the maximum torque, forming a slip clutch that allows the fixed ring gear to move or rotate partially when the breakaway torque is reached, preventing damage by blocking the transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transmission is designed to transmit high torque, then the power transmission capability is improved, but the transmission becomes vulnerable to blocking and damage under excessive torque conditions
Solution Approach 1:
The fixed ring gear is designed to transition from a stationary state to a movable state when breakaway torque is reached. This dynamic characteristic allows the ring gear to rotate partially relative to the transmission housing, enabling the transmission to adapt to excessive torque conditions by allowing controlled movement rather than rigid blocking, thus protecting the transmission from damage while maintaining power transmission capability under normal operating conditions.
2Force
If the transmission is designed with high torque capacity, then the driving force is improved, but the transmission may be blocked and damaged when excessive torque occurs
Solution Approach 1:
The fixed ring gear is pre-configured with a breakaway torque characteristic that acts as a protective mechanism before damage can occur. When excessive torque is applied to the transmission, the fixed ring gear reaches its breakaway torque threshold and rotates partially, absorbing the excess energy and preventing it from being transmitted to other components. This beforehand cushioning effect protects the transmission from damage while maintaining high driving force capability during normal operation.
3Productivity
If the fixed ring gear is made stationary, then the transmission efficiency is improved, but the transmission cannot withstand blocking conditions
Solution Approach 1:
The fixed ring gear is designed with dynamic characteristics that allow it to transition between stationary and movable states. During normal operation, the ring gear remains stationary relative to the transmission housing, providing efficient torque transmission. However, when the breakaway torque is reached, the ring gear can rotate partially, allowing the transmission to withstand blocking conditions without damage. This dynamic design resolves the contradiction between maintaining transmission efficiency and withstanding torque resistance.
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 slip clutch effectively prevents damage to the transmission and tool holder by allowing the fixed ring gear to disengage at a predetermined torque, ensuring the tool operates safely and efficiently.
Implementation Method 1
The fixed ring gear is arranged such that the fixed ring gear comprises breakaway torque... The slip clutch allows a blocking transmission to be substantially prevented... the breakaway torque, which is less than or equal to the maximum torque
Data Source
AI summary
A hand-held power tool has a housing, a drive motor including a drive shaft, a transmission drivable by the drive shaft, and a tool holder for holding an insertion tool, which is drivable by the transmission. The transmission includes a transmission housing, a transmission cover, and a fixed ring gear. The transmission cover at least partially closes the transmission housing. The fixed ring gear is located such that the fixed ring gear has a breakaway torque.