Reverse-Input Blocking Clutch with Split Pressed Member Structure
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Solution Overview
Problem
The existing reverse-input blocking clutch designs suffer from deterioration of the roundness of the pressed surface, leading to reduced controllability and locking performance due to direct connection and fixation methods, which affect the switching between unlocked and locked states.
Innovation Solution
A reverse-input blocking clutch design featuring a pressed member with a first and second pressed member element, where the input and output members are rotatably supported, and an engaging element that moves to engage or disengage based on torque direction, utilizing an elastic member and reinforcing structure to maintain surface integrity and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the clutch housing is directly connected and fixed to the motor housing by bolts, then the structure is simple and easy to manufacture, but the roundness of the pressed surface deteriorates due to deformation
Solution Approach 1:
The clutch housing is divided into two separate elements: the first pressed member element (clutch housing main body) and the second pressed member element (mounting portion). This segmentation allows the pressed surface to be protected from deformation while enabling separate fixation of the mounting portion to the motor housing, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The first pressed member element acts as an intermediary between the pressing mechanism and the second pressed member element. It provides a stable pressed surface that is isolated from the deformation caused by direct bolting, thereby maintaining manufacturing precision while still allowing for easy assembly and manufacture.
2Device complexity
If the clutch housing is directly fixed to the motor housing, then the structure is compact and simple, but the controllability and locking performance are reduced due to surface deformation
Solution Approach 1:
By segmenting the clutch housing into two elements with distinct functions, the design maintains relative simplicity while ensuring the pressed surface remains undeformed. The first element provides the pressed surface for reliable engagement, while the second element handles the fixation function, thereby maintaining locking performance without significantly increasing device complexity.
Solution Approach 2:
The first pressed member element is specifically designed with high rigidity and precision in the region of the pressed surface to ensure reliable engagement, while the second pressed member element is optimized for fixation. This local differentiation of quality ensures high reliability in the pressing function while keeping the overall structure relatively simple.
3Device complexity
If a single clutch housing structure is used, then the device is simple, but the pressed surface deforms under load affecting switching performance
Solution Approach 1:
The clutch housing is segmented into two elements where the first element maintains the pressed surface geometry for proper engaging element contact, while the second element is fixed to the motor housing. This segmentation prevents deformation that would affect switching performance while keeping the overall device structure relatively simple.
Solution Approach 2:
The first pressed member element acts as a protective structure that prevents deformation of the pressed surface before it can affect the switching performance. By providing this protective structure in advance, the design ensures consistent switching performance without requiring complex active compensation mechanisms.
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
This design effectively prevents the deterioration of the pressed surface roundness, enhancing the controllability and locking performance by maintaining surface integrity and ensuring smooth switching between states without deformation.
Implementation Method 1
an elastic member and reinforcing structure to maintain surface integrity and prevent deformation
Data Source
AI summary
A reverse-input blocking clutch, comprising a pressed member, an input member, an output member, and an engaging element, the pressed member including a first pressed member element having a pressed surface around an inner peripheral surface thereof and a second pressed member element having a mounting portion fixed to a portion that does not rotate during use, the engaging element configured to transmit rotational torque input to the input member to the output member by moving in a direction away from the pressed surface and to completely block rotational torque reversely input to the output member or transmit a part of the rotational torque reversely input to the output member to the input member and block a remaining part thereof.