Sliding Element for Electromechanical Brake Booster Friction
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Solution Overview
Problem
Existing electromechanical brake boosters experience friction and wear issues due to lateral forces from toothed mechanisms, particularly when using fibre-reinforced plastics, which increase friction and wear between components.
Innovation Solution
Incorporating sliding elements made of non-fibre-reinforced plastics, such as polyoxymethylene, between the actuating element and the housing, which are designed to protrude and have a ribbed structure for increased contact surface area, reducing friction and wear by replacing direct contact and allowing for lubrication between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibre-reinforced plastics are used for the housing and actuating element, then strength and stiffness are improved, but friction and wear between components increase
Solution Approach 1:
A sliding element made of non-fibre-reinforced plastic is introduced as an intermediary component between the actuating element and the housing. This sliding element has a smoother surface and lower friction coefficient compared to fibre-reinforced plastics, thereby reducing friction and wear while allowing the housing and actuating element to maintain their fibre-reinforced construction for strength.
2Stability of the object's composition
If fibre-reinforced plastics are used for the housing and actuating element, then structural stability is improved, but friction between components increases
Solution Approach 1:
The sliding element acts as a mediator with a smooth, non-fibre-reinforced plastic surface that reduces friction between the actuating element and housing, while allowing both components to maintain their fibre-reinforced construction for structural stability.
Solution Approach 2:
The invention changes the material parameter of the sliding element from fibre-reinforced plastic to non-fibre-reinforced plastic, which has different friction characteristics. This parameter change reduces the friction coefficient at the contact interface while maintaining the overall structural stability of the brake booster.
3Ease of operation
If a toothing mechanism is used for movement transmission, then rotational to translational conversion is achieved, but lateral forces causing friction and wear are generated
Solution Approach 1:
The sliding element is positioned between the actuating element and the housing to reduce friction and wear caused by lateral forces from the toothing mechanism, while the toothing mechanism continues to perform its function of converting rotational movement to translational movement.
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
This configuration significantly reduces friction and wear, enhances stability, and increases the number of load cycles, improving the performance and reducing the likelihood of stick-slip effects in electromechanical brake boosters.
Implementation Method 1
allowing for lubrication between components
Implementation Method 2
significantly reduces friction and wear
Data Source
AI summary
An electromechanical brake booster for a vehicle brake system is disclosed. The electromechanical brake booster has an actuating element which is couplable to an electric motor via a transmission, a housing in which the actuating element is displaceably received, and at least one sliding element which is arranged between the housing and the actuating element. A vehicle brake system, subassembly therefor and sliding element is also disclosed.