Steering Reverse-Input Blocking Mechanism With Moving Pins
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Solution Overview
Problem
Existing electric power-assisted steering systems, such as motor-driven power steering (MDPS), face challenges in preventing the transfer of external forces from the wheel to the steering motor, which can affect the driver's intended steering and vehicle performance.
Innovation Solution
A device comprising a first and second housing, an output shaft with concave curved surfaces, an input shaft with concave grooves, and moving pins that interact to block external forces, utilizing materials with lower friction coefficients and elastic members to prevent reverse input and enhance steering control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motor-driven power steering system is implemented with electrical connection only between steering shaft and steering wheel, then steering assistance can be provided, but external force from the wheel cannot be blocked and transfers to the steering motor
Solution Approach 1:
A reaction force blocking mechanism is introduced as an intermediary component between the steering motor and the steering shaft. This mechanism includes a reaction force blocking member that selectively blocks reverse input torque from the steering wheel from reaching the steering motor, while allowing forward torque transmission. The blocking member is positioned to engage with the steering shaft and prevent rotational movement in the reverse direction, effectively isolating the steering motor from external forces generated by road irregularities or wheel binding.
2Device complexity
If reverse input torque is allowed to transfer to the steering motor, then the structure remains simple, but the driver's intended steering cannot be maintained and vehicle control is affected
Solution Approach 1:
The reaction force blocking mechanism employs a dynamic blocking member that can selectively engage and disengage based on the direction of torque application. The blocking member is designed to remain disengaged during normal forward steering operations, allowing smooth torque transmission from the steering wheel to the steering shaft. When reverse input torque is detected (indicating external force from the wheel), the blocking member automatically engages to prevent this reverse torque from reaching the steering motor, thus maintaining steering control accuracy without requiring a completely complex mechanical structure.
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 effectively blocks external forces, improving driving performance by allowing the driver to maintain intended steering, thereby enhancing vehicle control and reducing friction between components.
Implementation Method 1
one or more moving pins disposed on the concave grooves, respectively, and configured to come into contact with the concave curved surfaces, respectively
Implementation Method 2
one or more elastic members respectively disposed between the one or more moving pins and the input shaft
Data Source
AI summary
A device for preventing a reverse input includes a first housing, a second housing coupled with the first housing to define an internal space along with the first housing, an output shaft including an output disk disposed in the internal space and having one or more concave curved surfaces on an outer circumference surface of the output disk and an output shaft body configured to protrude from the output disk, an input shaft including an input disk having one or more concave grooves on an outer circumference surface thereof and an input shaft body disposed on a same rotation axis as a rotation axis of the output shaft body to protrude from the input disk, and one or more moving pins disposed on the concave grooves, respectively, to come into contact with the concave curved surfaces, respectively.