Brake Master Cylinder Coupling for Axial Detection
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Solution Overview
Problem
Existing brake master cylinder arrangements for motor vehicle brake systems face reliability issues in detecting brake pedal actuation, leading to potential malfunctions and reduced accuracy in determining brake forces.
Innovation Solution
A brake master cylinder arrangement that includes a pressure piston unit, a force input member, a position sensor element, a detection unit, and a coupling arrangement which couples the position sensor element to the piston arrangement in a substantially rigid manner, allowing for axial movement detection while decoupling rotational movements, thereby enhancing reliability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position sensor element is rigidly coupled to the piston arrangement, then the detection precision of brake pedal actuation is improved, but the mechanical loading on the sensor element increases leading to potential malfunctions
Solution Approach 1:
The coupling arrangement is divided into a first section coupled to the piston arrangement and a second section coupled to the position sensor element, with a rotational degree of freedom between them. This segmentation allows the axial movement to be transmitted for detection while preventing rotational forces from loading the sensor element, thus maintaining both detection precision and reliability.
Solution Approach 2:
The coupling arrangement acts as an intermediary between the piston arrangement and the position sensor element. It transmits the axial movement information to the sensor while decoupling rotational movements, thereby protecting the sensor from mechanical loading and ensuring reliable operation without compromising detection accuracy.
2Measurement precision
If the position sensor element is coupled to detect axial movement, then the detection accuracy of brake pedal actuation is improved, but rotational movements cause excessive mechanical loading on the sensor element
Solution Approach 1:
The coupling arrangement incorporates a rotational degree of freedom that allows it to dynamically adapt to rotational movements of the piston arrangement. This dynamic capability enables the coupling to maintain axial movement transmission for accurate detection while automatically accommodating rotational movements without transmitting them to the position sensor element, thus eliminating excessive mechanical loading.
3Reliability
If a rigid coupling is used between the position sensor element and piston arrangement, then the reliability of detection is improved, but the complexity of the coupling arrangement increases
Solution Approach 1:
The coupling arrangement performs multiple functions: it provides rigid axial coupling for reliable detection, incorporates rotational degree of freedom to decouple rotational movements, and transmits axial forces from the piston to the sensor element. By integrating these multiple functions into a single coupling arrangement with two sections, the design achieves high detection reliability without excessive complexity.
Data Source
AI summary
The invention relates to a brake master cylinder arrangement for a motor vehicle brake system, comprising at least one piston arrangement with: a pressure piston unit that can be moved along a movement axis (V) and, together with a housing arrangement of the brake master cylinder arrangement, defines a pressure chamber; and a force input member that can be moved according to the actuation of the brake pedal and is coupled, or can be coupled, to the pressure piston unit so as to move therewith, the brake master cylinder also comprising: a position transmitter element that can be moved according to the actuation of the force input member; a detection unit designed to detect a movement of the position transmitter element; and a coupling arrangement designed to couple the position transmitter element to at least one element of the piston arrangement in a substantially rigid manner, along the movement axis (V), the coupling arrangement also being designed to allow a rotation of the at least one element of the piston arrangement in relation to the position transmitter element about the movement axis (V).