Pedal Reaction Force Geometry for Low-Friction Operation
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Solution Overview
Problem
Existing pedal force detection devices experience deviation in reaction force from its design value due to increased frictional force when the clevis pin moves away from the central axis, leading to inefficient pedal operation.
Innovation Solution
A pedal device with a housing, a pedal that rotates about a rotational axis, and a reaction force generator. The pedal includes an urging portion that transmits the urging force to the reaction force generator, which has a linearly moving portion that moves in the extending direction of its central axis. The urging portion is positioned such that a virtual urging center passes through a virtual axis perpendicular line during pedal rotation, minimizing the change in the position of the urging surface and maintaining the reaction force within its design value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the urging portion is positioned such that the virtual urging center does not pass through the virtual axis perpendicular line during pedal rotation, then the pedal can rotate within a predetermined rotational range, but the position of the urging surface changes significantly causing frictional force increase and reaction force deviation from design value
Solution Approach 1:
The patent positions the urging portion dynamically such that the virtual urging center passes through the virtual axis perpendicular line during pedal rotation. This dynamic positioning ensures that the urging surface position change is minimized throughout the rotation range, maintaining consistent reaction force characteristics and preventing deviation from the design value while still allowing the pedal to rotate within the predetermined rotational range.
2Force
If the linearly moving portion moves away from the central axis direction, then the pedal can transmit urging force during rotation, but the frictional force increases causing reaction force deviation from design value
Solution Approach 1:
The patent introduces the virtual urging center and virtual axis perpendicular line as intermediary geometric constructs to define the optimal positioning of the urging portion. By using these intermediary references, the patent ensures that the urging surface maintains a consistent position relative to the linearly moving portion's central axis, minimizing frictional force while still enabling effective urging force transmission during pedal rotation.
Data Source
AI summary
A pedal device includes: a pedal configured to rotate about a rotational axis; and a reaction force generator configured to generate a reaction force corresponding to an urging force generated by pressing operation of the pedal. The pedal includes an urging portion configured to transmit the urging force to the reaction force generator when the urging portion is rotated integrally with the pedal. The reaction force generator includes a linearly moving portion configured to move linearly in an extending direction of a central axis of the reaction force generator when the pressing operation is performed. The urging portion has an urging surface configured to urge a contact surface of the linearly moving portion. The urging portion is placed at a position where a virtual urging center passes through a virtual axis perpendicular line when the pedal is rotated within a predetermined rotational range.