Reverse Input Cutoff Clutch Layout for Compact Electric Motors
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Solution Overview
Problem
Existing electric actuators with reverse input cutoff clutches require additional bearings to support the input and output members, making the system less compact.
Innovation Solution
The electric motor with a reverse input cutoff clutch features a configuration where the output shaft is connected by a reverse input cutoff clutch, allowing for rotational torque transmission and reverse torque cutoff, while utilizing a bearing device to support the second shaft, thereby reducing the axial dimensions and enhancing compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input member and output member of the reverse input cutoff clutch are arranged in parallel with the output shaft, then the clutch can transmit torque from the output shaft to the screw shaft and completely cut off reverse torque, but additional bearings are required to support the input and output members, making the system less compact
Solution Approach 1:
The patent combines the input member and output member of the reverse input cutoff clutch onto a single output shaft, eliminating the need for separate support bearings for each member. This merging approach maintains the torque transmission and cutoff functions while reducing the axial dimensions of the motor housing, directly resolving the contradiction between reliability and compactness.
Solution Approach 2:
The output shaft is designed to serve multiple functions: it acts as both the input member and output member of the reverse input cutoff clutch, and also provides structural support for the entire clutch mechanism. This multi-functionality eliminates the need for additional support structures and bearings, achieving compact design without compromising the clutch's torque transmission and cutoff capabilities.
2Reliability
If multiple bearings are used to support the input and output members of the reverse input cutoff clutch, then the clutch members can be properly supported, but the number of parts increases and the system becomes more complex
Solution Approach 1:
The patent merges the support function into the motor housing itself, which already provides structural support for the motor components. The motor housing is designed with integrated support features that eliminate the need for separate support bearings, reducing the number of parts while maintaining proper support and rotation of the clutch members.
Solution Approach 2:
The motor housing is designed to serve multiple functions: it houses the motor components, provides structural support, and directly supports the reverse input cutoff clutch mechanism. This multi-functionality eliminates the need for additional support bearings, simplifying the overall device structure while maintaining reliability.
Data Source
AI summary
An output shaft is configured by connecting a first shaft and a second shaft, coaxially arranged with each other, by a reverse input cutoff clutch 20; an end portion on one side in an axial direction of the second shaft located on an opposite side from the first shaft with a gear portion sandwiched in between in the axial direction being rotatably supported with respect to a fixed portion by a bearing device; the reverse input cutoff clutch having a function that, when rotational torque is input to the first shaft, transmits the rotational torque input to the first shaft to the second shaft, and when rotational torque is reversely input to the second shaft, completely cuts off the rotational torque reversely input to the second shaft and does not transmit the rotational torque to the first shaft, or transmits part of the rotational torque to the first shaft and cuts off the remaining portion.