Elastic Spring Coupling in Electromechanical Brake Boosters
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Solution Overview
Problem
Existing electromechanical brake boosters require significant muscle power from drivers during rapid brake actuations, such as emergency braking, as they need to accelerate the moving parts of the auxiliary force generator, leading to increased effort and potential failure in auxiliary braking scenarios if the generator fails.
Innovation Solution
An elastic connection via a spring element between the piston rod and the power takeoff element of the auxiliary force generator reduces the force transmission required from the driver during rapid brake actuations, allowing the auxiliary force generator to accelerate faster while enabling external force braking without muscle power and providing auxiliary braking in case of generator failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the piston rod is rigidly connected to the power takeoff element of the auxiliary force generator, then force transmission is efficient, but the muscle power required during rapid brake actuation increases significantly
Solution Approach 1:
The patent introduces a spring element as an intermediary component between the piston rod and the power takeoff element of the auxiliary force generator. This spring element acts as a mediator that decouples the rigid connection, allowing the piston rod to move independently during rapid brake actuation without requiring the driver to accelerate the heavy moving parts of the auxiliary force generator, thereby reducing the required muscle power while maintaining force transmission under normal conditions
2Force
If the piston rod is rigidly connected to the power takeoff element, then the auxiliary force generator accelerates slower during rapid brake actuation, but force transmission is maintained
Solution Approach 1:
The spring element serves as a mediator that allows the piston rod to accelerate rapidly during emergency braking without being constrained by the inertia of the auxiliary force generator's moving parts. This enables the auxiliary force generator to accelerate at its own optimal rate while still receiving the braking force through the spring connection, resolving the conflict between force transmission and acceleration speed
3Reliability
If the auxiliary force generator fails, then braking capability is compromised, but the system becomes simpler
Solution Approach 1:
The spring element provides a passive mechanical connection that ensures braking capability is maintained even if the auxiliary force generator fails. The spring maintains continuous contact between the piston rod and the power takeoff element, allowing manual braking to function independently of the electrical system, thereby providing redundancy and reliability without requiring complex backup systems
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 elastic connection reduces the muscle power needed for fast brake actuations and ensures continuous braking capability even if the auxiliary force generator fails, enhancing driver comfort and safety by minimizing the effort required during emergency braking and providing reliable auxiliary braking.
Implementation Method 1
a power takeoff element of the auxiliary force generator is connected elastically, for instance by means of a spring element, to the piston rod
Data Source
AI summary
The invention relates to an electromechanical brake booster with an electric motor and a helical gearing. The brake booster is used for coupling an auxiliary force via a driver into a piston rod. The invention proposes connecting a spindle of the helical gearing elastically via a spring element to the piston rod such that, in the event of rapid actuation of the brake, the helical gearing and a rotor of the electric motor do not have to be accelerated entirely muscle power. The muscle power required for actuating a brake is reduced as a result in the event of a rapid actuation of the brake.