Pedal Simulator Rubber Buffering Member Vibration Control
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Solution Overview
Problem
The direct contact between a reaction force piston and a simulator block during vehicle braking leads to unexpected noise and vibration, reducing the pedal feel for the driver.
Innovation Solution
A pedal simulator with a buffering member made of rubber is integrated to prevent direct contact between the reaction force piston and the simulator block, utilizing a two-stage damping structure to provide low repulsive force initially and high repulsive force during braking, and featuring a coupling groove with a separation prevention portion to absorb impact and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston and simulator block are formed of metal material to maintain durability, then reliability is improved, but noise and vibration occur during release of braking
Solution Approach 1:
A buffering member made of rubber is introduced as an intermediary element between the metal piston and the metal simulator block. This buffering member absorbs impact and prevents direct metal-to-metal contact during piston retraction, thereby eliminating noise and vibration while maintaining the durability benefits of metal components.
Solution Approach 2:
The patent employs composite material construction by combining metal components (piston and simulator block) with a rubber buffering member. This composite approach allows the system to leverage the strength and durability of metal while using the vibration-absorbing properties of rubber to mitigate harmful noise and vibration during operation.
2Object-generated harmful factors
If a buffering member is added to prevent direct contact between piston and simulator block, then noise and vibration are reduced, but device complexity increases
Solution Approach 1:
The buffering member is nested within the existing piston structure, specifically installed in a coupling groove on the piston body. This nesting approach allows the buffering member to be integrated into the existing design without requiring separate mounting structures or significant structural modifications, thereby minimizing the increase in device complexity.
3Object-generated harmful factors
If the buffering member is installed in the coupling groove, then direct contact is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The coupling groove is designed with specific local geometric features (stepped portions) that provide precise positioning and retention for the buffering member. This localized structural design ensures that the buffering member is automatically positioned correctly during installation, reducing the need for high-precision manual installation while maintaining effective contact prevention.
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 minimizes noise and vibration, enhancing the pedal feel by preventing direct contact between metal components and providing improved braking performance through a two-stage damping mechanism.
Implementation Method 1
An upper end of a reaction force piston of the reaction force portion that moves back to an original position thereof during release of the braking is provided with a buffering member formed of rubber by which the simulator block is not in contact with the upper end of the reaction force piston
Implementation Method 2
a first damping member installed to the reaction force piston in a manner that the first damping member moves along with the reaction force piston, configured to be elastically deformed by pressurization so as to provide reaction force
Implementation Method 3
The pedal simulator is connected to the master cylinder, receives hydraulic pressure corresponding to a pedal effort of a brake pedal
Data Source
AI summary
A pedal simulator is disclosed. The pedal simulator is connected to a master cylinder, receives hydraulic pressure corresponding to a pedal effort of a driver of a vehicle, and provides pedal feel to the driver. The pedal simulator includes a simulator block, an upper part of which includes an oil port connected to the master cylinder, configured to include a bore communicating with the oil port, and a reaction force portion provided in the bore, configured to be pressurized by oil introduced through the oil port during braking of the vehicle, and provide reaction force. An upper end of a reaction force piston of the reaction force portion that moves back to an original position thereof during release of the braking is provided with a buffering member formed of rubber by which the simulator block is not in contact with the upper end of the reaction force piston.