Resin Pedal Reaction Force Contact Member for Vibration Isolation
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Solution Overview
Problem
Existing reaction force application devices generate vibrations due to concave or convex portions on rotatable members contacting the arm, deteriorating the pedal force feeling of the driver.
Innovation Solution
A reaction force application device with a contact member made of resin, featuring a contact surface and specific shape portions formed during molding, which are positioned differently from the contact surface, preventing contact with the pedal and arm, thereby reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If concave or convex portions are formed on the rotatable member during molding, then the manufacturing process is simplified, but vibrations are generated that deteriorate pedal force feeling
Solution Approach 1:
The harmful concave or convex portions are extracted from the contact surface portion of the rotatable member. By positioning these shape portions at locations that do not contact the pedal or arm during operation, the vibration transmission problem is eliminated while maintaining the molding process benefits.
Solution Approach 2:
Different portions of the rotatable member are given different qualities: the contact surface portion is designed to be smooth and free of shape portions to prevent vibration, while other portions may retain shape portions for manufacturing efficiency. This local differentiation resolves the contradiction between ease of manufacture and vibration prevention.
2Device complexity
If the contact member is made of resin with shape portions, then manufacturing complexity is reduced, but contact with the pedal causes vibrations
Solution Approach 1:
The harmful shape portions are extracted from the regions that would contact the pedal or arm. By removing these features from critical contact zones while maintaining them in non-critical areas, the design achieves both manufacturing simplicity and vibration-free operation.
Solution Approach 2:
The rotatable member acts as an intermediary between the actuator and the pedal/arm. By carefully designing which portions of this intermediary contact what, the system transmits force without transmitting vibrations, resolving the contradiction between simple structure and vibration prevention.
Data Source
AI summary
An actuator generates a drive force in response to energization. A lever is configured to be rotated by a drive force transmitted from the actuator to apply the reaction force to a pedal. A contact member is provided to the lever such that the contact member can be brought into contact with or separated from the pedal. The contact member is made of resin and has: a contact member main body; a contact surface portion that is formed on the contact member main body and is configured to contact the pedal; and a specific shape portion that is shaped in a form of a projection or a recess and is formed on the contact member main body at a time of molding the contact member. The specific shape portion is formed on the contact member main body at a corresponding location that is different from the contact surface portion.