Solenoid Locking Device for Motor Vehicle Transmission Reverse Gear
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Solution Overview
Problem
Conventional locking devices for motor vehicle transmissions do not effectively prevent the engagement of reverse gear at high speeds, leading to potential transmission damage.
Innovation Solution
A compact locking device with a solenoid arrangement and integrated sensor, housed in a sealed chamber, moves an inhibitor to prevent reverse gear engagement, utilizing an eddy current sensor for contact-less detection and a logic control circuit to manage the solenoid, ensuring safe operation without external switches or sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a separate switch or sensor is used to detect reverse gear engagement, then the detection function is achieved, but the device complexity increases
Solution Approach 1:
The patent combines the solenoid arrangement and the reverse gear sensor into a single integrated unit. The sensor is positioned to detect the inhibitor's position directly, while the solenoid actuates the same inhibitor mechanism, eliminating the need for separate external switches or sensors and reducing overall system complexity.
Solution Approach 2:
The integrated unit serves multiple functions: the solenoid arrangement actuates the inhibitor to prevent reverse gear engagement, while the sensor simultaneously detects the inhibitor's position to indicate reverse gear engagement. This multi-functional design reduces the number of separate components needed in the system.
2Device complexity
If the solenoid arrangement and sensor are exposed to the transmission environment, then the mechanism remains simple, but contaminants like oil can damage the components
Solution Approach 1:
The patent employs a sealed housing structure that encloses the solenoid arrangement and sensor, protecting them from contaminants like oil and other transmission environment hazards. The housing acts as a protective barrier while allowing the integrated unit to function within the transmission system.
3Reliability
If an inhibitor mechanism is used to prevent reverse gear engagement, then transmission damage is prevented, but the device complexity increases
Solution Approach 1:
The patent integrates the inhibitor mechanism with the solenoid arrangement and sensor into a single compact unit. The inhibitor is actuated by the solenoid and detected by the sensor, both within the same housing, reducing the overall complexity compared to separate locking and detection systems.
Solution Approach 2:
The integrated unit automatically controls the inhibitor based on sensor feedback. When the sensor detects that the inhibitor is in the reverse gear engaged position, it triggers the solenoid to actuate the inhibitor, creating a self-regulating system that prevents transmission damage without requiring external control 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 solution provides a self-contained, contaminant-protected unit that prevents reverse gear engagement at high speeds, reducing transmission damage and eliminating the need for additional force or external components, while enabling touch-less detection of reverse gear engagement.
Implementation Method 1
the inhibitor follows the movement of a core part which is likewise movable in the axial direction through a solenoid arrangement (18) provided in the housing (1)
Implementation Method 2
utilizing an eddy current sensor for contact-less detection
Data Source
AI summary
A locking device for inhibiting the engagement of the reverse gear of a motor vehicle transmission has an inhibitor (2) arranged in a housing (1). The inhibitor (2) prevents the movement of a transmission part (15) of the transmission in a first position and permits the movement of the transmission part (15) in a second position. A sensor (8) for indicating the engaged reverse gear is further provided in the housing (1). The inhibitor (2) is axially movable in the housing (1) and follows the movement of a core part (3), which is likewise movable in the axial direction through a solenoid arrangement (18) provided in the housing (1). The coil (5) of the solenoid arrangement (18) surrounds the core part (3). The solenoid arrangement (18) is arranged in a chamber (9) of the housing (1).