Friction Clutch Piston Bubble Removal for Accurate Oil Pressure
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Solution Overview
Problem
Existing driving force transmitting apparatuses face challenges in accurately detecting oil pressure due to bubble accumulation around the oil pressure sensor, which affects the reliability and precision of torque control in frictional engagement devices like clutches.
Innovation Solution
The apparatus incorporates a bubble removing chamber and a bubble discharging groove in the piston housing, positioned adjacent to the operating-oil receiving chamber, to effectively remove and discharge bubbles, ensuring the oil pressure sensor detects accurate oil pressure without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the oil pressure sensor is installed in the piston chamber to detect oil pressure, then the torque control precision is improved, but bubbles accumulate around the sensor causing detection inaccuracy
Solution Approach 1:
The piston chamber is segmented into two distinct regions: the operating oil storage chamber where oil pressure is generated and transmitted, and the sensor installation chamber where the oil pressure sensor is mounted. This segmentation isolates the sensor from bubble accumulation zones while maintaining access to accurate oil pressure measurements through the communication passage.
Solution Approach 2:
A communication passage serves as an intermediary channel connecting the operating oil storage chamber and the sensor installation chamber. This passage allows oil pressure to be transmitted to the sensor while preventing direct exposure to bubbles that accumulate in the main chamber, enabling accurate measurement without contamination.
2Measurement precision
If the sensor installation chamber is separated from the operating oil storage chamber, then bubble accumulation around the sensor is reduced, but the structure becomes more complex
Solution Approach 1:
The sensor installation chamber is merged with the piston chamber structure through a shared wall configuration, where part of the piston chamber forms the sensor installation chamber. This integration approach maintains structural simplicity while achieving functional separation to prevent bubble accumulation around the sensor.
Solution Approach 2:
The sensor installation chamber is nested within the overall piston chamber structure, with the two chambers communicating through an internal passage. This nested configuration allows the sensor chamber to be housed within the existing piston chamber boundaries, minimizing additional structural complexity while achieving bubble isolation.
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 enhances the accuracy of oil pressure detection by preventing bubble accumulation around the sensor, allowing for improved torque control and system reliability in driving force transmission.
Implementation Method 1
a bubble removing chamber (46) for removing bubbles accumulated in the operating-oil receiving chamber (45)
Implementation Method 2
an oil pressure sensor (40) for detecting the oil pressure of operating oil in the piston chamber (42)
Implementation Method 3
a piston member (33) that is movable in the axial direction and that presses the frictional engagement unit (23) so that the first and second friction members (23a, 23b) are engaged with each other
Implementation Method 4
a frictional engagement unit (23) which is disposed around the rotating shaft (51, 52) and which includes first and second friction members (23a, 23b) that are alternately stacked in an axial direction
Data Source
AI summary
A driving force transmitting apparatus includes a rotating shaft, a frictional engagement device, a piston member, a piston housing, a piston chamber, an oil pressure sensor, an attachment hole, an operating-oil receiving chamber, a bubble removing chamber, and a bubble discharging groove. The rotating shaft has an axial direction and is rotatable around the axial direction. The frictional engagement device includes a frictional engagement unit which is disposed around the rotating shaft and which includes first and second friction members that are alternately stacked in the axial direction. The piston member is movable in the axial direction to press the frictional engagement unit so that the first and second friction members are engaged with each other. The piston housing contains the piston member. The piston chamber is defined between an inner surface of the piston housing and the piston member.