Transmission Pressure Sensor Layout With Separated Hydraulic Interface
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Solution Overview
Problem
Existing pressure measuring units for motor vehicle transmissions require large and complex housings with separate interfaces for electrical, mechanical, and hydraulic connections, leading to high costs and inflexible installation due to costly adaptations for specific installation conditions.
Innovation Solution
A pressure measuring unit with integrated electrical and mechanical interfaces and a detached hydraulic interface, allowing for a cost-effective and flexible connection to a control unit, where the pressure sensor is surface-mountable and connected via adhesive bond, and the hydraulic interface is sealed using an annular sealing part like an O-ring for pressure equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate interfaces for electrical, mechanical, and hydraulic connections are used, then reliable connection is achieved, but housing size and complexity increase
Solution Approach 1:
The patent combines the electrical interface and mechanical interface into a single integrated circuit carrier structure. The circuit carrier serves both as the mechanical mounting base and as the electrical connection substrate, eliminating the need for separate housing structures for each interface type.
Solution Approach 2:
The circuit carrier is designed to perform multiple functions simultaneously: it provides mechanical support for the pressure sensor, establishes electrical connections through integrated contacts, and enables hydraulic pressure transmission. This multi-functional design reduces overall system complexity while maintaining reliable connections.
2Adaptability or versatility
If large and complex housings are used for separate interfaces, then all connection requirements are met, but manufacturing costs increase
Solution Approach 1:
By merging the electrical and mechanical interfaces into one integrated circuit carrier, the patent reduces the number of separate components that need to be manufactured and assembled. This integration simplifies the manufacturing process and reduces costs while maintaining the ability to adapt to different installation conditions.
Solution Approach 2:
The circuit carrier is designed with adaptable parameters such as adjustable contact positions and flexible mounting configurations, allowing the same basic structure to accommodate various installation conditions without requiring costly custom modifications.
3Reliability
If pressure sensor is in direct contact with user interface, then hydraulic connection is established, but installation flexibility is reduced
Solution Approach 1:
The patent segments the pressure sensor from the hydraulic interface by introducing an intermediate circuit carrier. The sensor contacts the circuit carrier at one location while the hydraulic interface is positioned separately, allowing independent optimization of each connection point and enabling flexible installation positions.
Solution Approach 2:
The circuit carrier acts as an intermediary element between the pressure sensor and the hydraulic interface. It transmits hydraulic pressure to the sensor while allowing the sensor to be positioned independently from the hydraulic connection point, thereby providing installation flexibility without compromising hydraulic connection reliability.
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 minimizes the size and complexity of the housing, reduces manufacturing costs, and allows for flexible installation of the pressure sensor while maintaining high measurement accuracy and ensuring a gas- or liquid-tight hydraulic connection.
Implementation Method 1
The hydraulic interface is sealed off from the surroundings in a gas- or liquid-tight manner with respect to the surroundings by means of an annular sealing part
Implementation Method 2
the mechanical interface between the pressure sensor and the circuit carrier to be embodied by means of an adhesive bond
Implementation Method 3
an opening is arranged in the circuit carrier for pressure equalization between the pressure sensor and the hydraulic interface
Data Source
AI summary
The example embodiment relates to a pressure measuring unit for determining the oil pressure in a motor vehicle transmission, including a circuit carrier, a pressure sensor, an electrical interface, a mechanical interface and a hydraulic interface. The pressure sensor is electrically connected to the circuit carrier by means of the electrical interface and mechanically connected to the circuit carrier by means of the mechanical interface on the first side of the circuit carrier. The hydraulic interface connecting the pressure measuring unit to a user hydraulic component is arranged on a side of the circuit carrier that is situated opposite the first side, and wherein an opening is arranged in the circuit carrier for pressure equalization between the pressure sensor and the hydraulic interface.