Hydraulic Clutch Sensor Guide Shoe Radial Decoupling
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Solution Overview
Problem
In hydraulic clutch actuations, existing magnetic sensor designs experience accuracy issues due to varying distances between the sensor and magnet body during axial displacements and wobbling movements, leading to wear and premature failure.
Innovation Solution
A central release mechanism with a magnetic sensor device where the magnet body is guided on the housing with a constant distance during axial displacements and decoupled radially, using a guide shoe that engages in a circumferential groove without axial play, ensuring precise axial guidance and preventing wear from drag torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the magnetic body is rigidly connected to the ring body via a support arm, then the magnetic body is firmly connected to the release bearing components, but radial and axial displacements caused by wobbling movements are transmitted directly to the magnet body, causing the distance between the sensor and magnet body to vary
Solution Approach 1:
The magnetic body is separated from the ring body connection through an independent guide mechanism. The magnet body is guided on the housing in the axial displacement direction through a guide profile that engages with a complementary counter-profile on the housing, allowing it to follow axial movements while being decoupled from radial displacements of the release bearing.
Solution Approach 2:
The guide profile and guide shoe act as intermediary elements between the magnetic body and the ring body. The guide shoe engages in a circumferential groove of the ring body without axial play but radially movable, serving as a mediator that transmits axial position information while filtering out radial wobbling movements.
2Reliability
If the magnetic body is rigidly connected to the ring body, then the magnetic body follows all movements of connected components, but drag torque during operation is transmitted from the magnet body to the sensor, causing considerable wear on contact surfaces
Solution Approach 1:
The guide shoe serves as an intermediary element that engages in the circumferential groove of the ring body. This guide shoe is resiliently pressed against the groove surfaces with pretension, allowing radial movement while maintaining axial guidance, thereby preventing direct transmission of drag torque from the magnet body to the sensor.
Solution Approach 2:
The direct mechanical connection between the magnet body and ring body is replaced with a guided engagement system. The magnet body is guided on the housing with a guide profile that positively but axially connects to the counter-profile, substituting the rigid mechanical connection with a controlled guidance mechanism that eliminates harmful friction and wear.
3Device complexity
If the magnetic body is guided laterally on the outside, then the structure is simple, but the distance between the stationary sensor and the movable magnet body does not remain constant during axial displacements and wobbling movements
Solution Approach 1:
The guidance mechanism uses a circumferential groove in the ring body that receives the guide shoe of the magnet body. This groove engagement provides axial guidance without radial play while allowing radial movement, effectively using the circumferential dimension to constrain axial position while permitting radial accommodation of wobbling movements.
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
Maintains accurate sensor signals by keeping the distance between the sensor and magnet constant during axial movements and wobbling, preventing wear and ensuring reliable clutch actuation.
Implementation Method 1
a sensor for detecting the axial position of the ring piston relative to the housing being stationarily fastened to the housing
Data Source
Figure 1
Figure 2~5
Figure 3~4
AI summary
A central release bearing (1) for a hydraulic clutch actuation is disclosed, comprising a housing (7) having a through-bore (29) and a sleeve (8) arranged therein and attached thereto, on which a ring piston (10) capable of being operatively connected to the clutch is slidably guided, and to which a release bearing inner ring (22) is attached. A sensor (5) is attached to the housing to detect the axial position of the ring piston, and a slidably guided magnetic body (6) is associated with the sensor. This magnetic body is axially free of play connected to a ring body (25) attached to the release bearing inner ring for the purpose of driving the ring piston. According to the invention, the magnetic body is slidably guided on the housing at a constant distance (39) from the sensor over its displacement path and engages with a guide shoe (42) in a circumferential groove (27) of the ring body in an axially free-play but radially movable manner.As a result, the aforementioned distance remains constant during all axial relative displacements and occurring release bearing wobble movements, and no wear impairing the sensor signal accuracy occurs on the guide surfaces for the magnet body due to drag torque during operation.