Reverse Input Blocking Clutch Control for Smooth Steering Torque Transfer
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Solution Overview
Problem
In locking-type reverse input blocking clutches, the alternation between rotatable and non-rotatable states of the input and output members can lead to a jerking phenomenon due to mismatched rotational speeds, causing mechanical elements connected to the output member to behave erratically.
Innovation Solution
An actuator with a reverse input blocking clutch that includes an input member and an output member, where the actuator applies torque to the input member in the opposite direction of the reversely input torque to switch the clutch state, allowing torque transmission between the members, and uses engaging elements with specific geometries and elastic biasing to manage torque transmission and locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking-type reverse input blocking clutch is used to completely block reverse torque, then the reliability is improved, but the jerking phenomenon occurs due to alternation between rotatable and non-rotatable states
Solution Approach 1:
The patent applies the dynamics principle by making the clutch state changeable between locked and unlocked conditions based on torque direction. The engaging element dynamically transitions between engaging and disengaging positions, allowing the system to adapt its torque transmission characteristics according to operational requirements, thereby preventing the jerking phenomenon while maintaining reliable reverse torque blocking
Solution Approach 2:
The engaging element serves as an intermediary component that mediates between the input member and output member. It controls torque transmission by selectively engaging or disengaging based on the direction of applied torque, allowing smooth transitions between states and preventing the harmful jerking effect while maintaining the reliability of reverse torque blocking
2Ease of operation
If the engaging element moves to separate pressing surfaces for torque transmission, then the ease of operation is improved, but the rotational speed mismatch causes jerking
Solution Approach 1:
The patent applies preliminary action by pre-positioning the engaging element and pressing surfaces such that torque transmission can be smoothly initiated. The engaging element is designed to gradually engage with the pressing surfaces, allowing rotational speeds to synchronize before full torque transmission begins, thereby preventing jerking while maintaining ease of operation
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
Prevents the jerking phenomenon by ensuring smooth operation between the input and output members, maintaining consistent rotational behavior and preventing intermittent rotation.
Implementation Method 1
an elastic member that elastically deforms, when torque in a predetermined direction is reversely input to the output member, in a direction that causes the engaging element to move in the locked position
Implementation Method 2
the pressing surface and the pressed surface to frictionally engage. This locks the rotation of the output member
Data Source
AI summary
An actuator with reverse input blocking clutch has a function of switching the reverse input blocking clutch to a state in which torque can be transmitted between an input member and an output member, in a state in which reverse torque is input to the output member from an output-side mechanism, by applying torque to the input member by an actuator in an opposite direction to a direction of the reverse torque, and then by giving an instruction to the actuator to apply torque having a magnitude smaller than a magnitude of the reverse torque to the input member in the opposite direction, transmitting the reverse torque to the input member.