Motor-Steered Cart Transmission with Torque Limiter Overload Protection
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Solution Overview
Problem
The existing vehicle carts are prone to transmission mechanism failure when an overload is applied from the steering motor, leading to potential breakdowns during usage as a luggage carrier.
Innovation Solution
Incorporating a torque limiter between the steering motor and the holding member within the transmission mechanism to absorb and manage excessive loads, preventing mechanical failure and ensuring continued functionality under overload conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission mechanism is directly connected between the steering motor and the holding member, then the steering response is direct and efficient, but the transmission mechanism is prone to breaking when an overload is applied
Solution Approach 1:
A torque limiter is introduced as an intermediary component between the steering motor and the holding member. This torque limiter acts as a mediator that allows normal torque transmission during regular operation while limiting excessive torque that could cause breakdown, thus protecting the transmission mechanism without requiring complete structural redesign
Solution Approach 2:
The torque limiter is configured to beforehand cushion or limit the torque transmitted from the steering motor to the holding member. By setting a predetermined torque threshold, the system prepares in advance to prevent overload damage before it occurs, rather than relying on post-failure analysis
2Reliability
If a torque limiter is added to the transmission mechanism, then the transmission mechanism is protected from breaking under overload, but the device complexity increases
Solution Approach 1:
The torque limiter serves as a specialized intermediary component that integrates into the existing transmission mechanism. Rather than redesigning the entire system, the torque limiter is inserted as a discrete element that performs the protective function while maintaining compatibility with the existing steering motor and holding member structure
Solution Approach 2:
The torque limiter changes the torque parameter transmission characteristics of the system. By introducing a predetermined torque threshold, the system transitions from direct torque transmission to conditional torque transmission, where torque is transmitted only when it remains below the limiting threshold, thus protecting against overload
Data Source
AI summary
A cart may include: a carriage; a wheel supported by the carriage and touching ground; a holding member rotatably supported by the carriage about a steering axis and rotatably supporting the wheel about a rotation axis; a steering handle to be gripped by a user; an input sensor configured to detect an operation on the steering handle by the user; a steering motor configured to be actuated in response to the operation by the user detected by the input sensor; and a transmission mechanism connecting the steering motor and the holding member and configured to rotate the holding member about the steering axis in response to actuation of the steering motor. The steering handle and the transmission mechanism may be mechanically separated, and the transmission mechanism may include a torque limiter interposed between the steering motor and the holding member.