Torque Cup Axial Shift Mechanism for Electric Tool Transmission
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Solution Overview
Problem
Existing electric tools face issues with accidental misoperation due to exposed shift frames, leading to increased probability of damage during high-torque operations, as the speed change mechanism is not effectively protected, causing potential damage to the transmission shaft.
Innovation Solution
A transmission system with a housing, double-layered gears, a torque cup, and planetary gears that allows for axial sliding of the ring gear and gear sleeve, enabling safe and controlled speed changes through a torque cup mechanism, reducing the risk of misoperation and shaft damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift frame is directly exposed outside the transmission system housing for operation, then the ease of operation is improved, but the reliability deteriorates due to accidental misoperation and potential damage to the transmission shaft
Solution Approach 1:
The shift frame is nested inside the transmission system housing rather than being exposed externally. The housing encloses the shift frame, making it inaccessible from the outside while maintaining its functional capability through the torque cup mechanism that transmits operational force to the internal shift frame through the gear sleeve and ring gear.
Solution Approach 2:
The torque cup acts as an intermediary mechanism between the user and the internal shift frame. Instead of directly operating the exposed shift frame, the user operates the torque cup which then transmits the operational force through the gear sleeve and ring gear to the shift frame, providing both protection and functional capability.
2Reliability
If the speed change mechanism is protected by enclosing the shift frame, then the reliability is improved, but the ease of operation deteriorates due to reduced accessibility
Solution Approach 1:
The torque cup serves multiple functions: it protects the internal shift frame from accidental operation, provides a user-friendly external interface for intentional speed changes, and transmits operational force through the gear sleeve and ring gear to the internal mechanism. This multi-functional design resolves the contradiction between protection and accessibility.
Solution Approach 2:
The operational interface is moved from the horizontal plane (exposed shift frame) to the axial dimension (torque cup on the output shaft). Users operate the torque cup by applying force along the axial direction, which then translates to rotational movement of the ring gear and gear sleeve, providing both protection and ease of operation through dimensional transformation.
3Device complexity
If the ring gear is designed to slide axially for speed change, then the device complexity is reduced, but the reliability deteriorates due to potential misoperation and shaft damage
Solution Approach 1:
The torque cup mechanism performs preliminary action by requiring intentional user operation to initiate the axial sliding of the ring gear. The user must actively engage the torque cup to overcome the spring force and move the ring gear axially, ensuring that speed changes only occur when deliberately intended rather than through accidental contact.
Solution Approach 2:
The spring mechanism provides preliminary anti-action by exerting a restraining force on the ring gear that prevents accidental axial sliding. The spring force must be overcome by intentional user input through the torque cup, creating a protective barrier against misoperation while allowing legitimate speed changes when needed.
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 provides a safer and more controlled operation by allowing workers to adjust speed and torque without exposing the shift frame, reducing the risk of accidental misoperation and damage to the transmission shaft, enhancing the overall reliability and safety of the electric tool.
Implementation Method 1
a first set of planetary gears for driving the mounting shaft, circumferentially regularly surrounding and meshing the first inner gear
Implementation Method 2
a torque cup mounted to the housing for a rotation about an axial center line of the housing and configured so that it can be turned to force the first ring gear to slide axially
Implementation Method 3
a pair of double-layer gear comprising a first outer or bigger gear and a first inner or smaller gear
Data Source
AI summary
Provided herein is a transmission system including: a housing; a pair of double-layered gears for transmitting a power from a motor to a screw driver shaft defining a transmission axis, the pair of gears including a first bigger gear and a first smaller gear; a torque cup for covering a leading end portion of the housing through which the shaft is extended from the housing; a first set of planetary gears for driving the shaft, regularly surrounding and meshing the first smaller gear; and a first ring gear for sliding axially against the housing and meshing the first bigger gear and/or the first set of planetary gears; wherein the torque cup can be turned to force the first ring gear to slide axially.