Magnetic Parking Lock Mechanism for Power Reduction
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Solution Overview
Problem
Existing parking devices require continuous energization of electromagnetic components to maintain the parking lock state or release state, leading to increased power consumption when hydraulic pressure drops.
Innovation Solution
A parking device with a magnetic locking mechanism using a coil, plunger, core, yoke, and permanent magnet, where the magnetic flux generated by the coil interacts with the permanent magnet's flux to restrain or release the piston, allowing the parking lock to be maintained without continuous energization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous energization of electromagnetic operating device is used to maintain parking lock state, then reliability is improved, but power consumption increases
Solution Approach 1:
The electromagnetic operating device is energized only periodically during state transitions (parking lock applied/released) rather than continuously. The coil generates magnetic flux temporarily to move the tripping member, after which the system maintains state through mechanical latching without continued energization.
Solution Approach 2:
The patent replaces continuous electromagnetic holding with a mechanical latch mechanism. The latch includes engagement surfaces that mechanically secure the tripping member in position, substituting the need for continuous electromagnetic force with passive mechanical retention.
2Device complexity
If hydraulic pressure is used to maintain parking lock released state, then device complexity is reduced, but reliability decreases when hydraulic pressure drops
Solution Approach 1:
Instead of using hydraulic pressure to actively maintain the released state, the system uses spring force to automatically return the piston to the locking position when hydraulic pressure is absent. The default state without active pressure is the locked state, reversing the conventional approach.
Solution Approach 2:
The spring device automatically returns the piston to the parking lock applied position when hydraulic pressure is not supplied, without requiring additional control mechanisms. The system self-corrects to a safe default state using stored elastic energy.
3Manufacturing precision
If electromagnetic operating device is used to move tripping member, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary electromagnetic components from the system. By using a simple coil and latch mechanism instead of complex electromagnetic operating devices, the design removes redundant parts while maintaining adequate position control through the simplified magnetic field generation.
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
Reduces power consumption by eliminating the need for continuous electromagnetic energization, effectively holding the parking lock state without hydraulic pressure assistance.
Implementation Method 1
a coil that is energized to generate a magnetic flux; a permanent magnet that forms a magnetic path
Implementation Method 2
the magnetic flux generated by the coil interacts with the permanent magnet's flux to restrain or release the piston
Implementation Method 3
a permanent magnet that forms a magnetic path in conjunction with the plunger, the core, and the yoke
Data Source
AI summary
A lock shaft and a shaft member (a plunger and a permanent magnet) of a magnetic locking device are arranged such that a moving direction thereof is orthogonal to a moving direction of a piston rod of a hydraulic actuator. In a parking lock released state, when the coil is not energized, the lock shaft and the shaft member are locked by an attracting force between the permanent magnet and a flange of a yoke so as not to move back from the piston rod, and, when the coil is energized, the attracting force between the permanent magnet and the flange is canceled, so that the lock shaft and the shaft member are allowed to move back from the piston rod.