Parking Device Discharge Valve for Faster Hydraulic State Switching
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Solution Overview
Problem
Existing parking devices face increased time requirements for applying and releasing the parking lock due to pipeline resistance and oil flow resistance in the hydraulic oil discharge process, which slows down the switching between the parking lock state and the released state.
Innovation Solution
Incorporating a separate discharge valve that prevents hydraulic oil discharge when hydraulic oil is supplied to the hydraulic oil chamber and allows discharge when it is not supplied, reducing the time needed to switch between states by using a drain check valve that opens when hydraulic pressure drops below a predetermined level, facilitating quicker movement of the movable member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If hydraulic oil is discharged via the solenoid valve only, then the structure remains simple, but the discharge time increases due to pipeline resistance and valve flow resistance
Solution Approach 1:
The patent divides the discharge function into two separate valves: a solenoid valve for controlled discharge and a discharge valve for rapid discharge. This segmentation allows each valve to be optimized for its specific function, with the discharge valve providing a dedicated low-resistance path for quick oil evacuation, thereby resolving the contradiction between discharge speed and structural complexity.
Solution Approach 2:
The discharge valve acts as an intermediary component that provides an alternative discharge path parallel to the solenoid valve. This intermediary structure enables rapid discharge by bypassing the flow resistance limitations of the solenoid valve, while the solenoid valve maintains its function for controlled operation.
2Productivity
If a separate discharge valve is added to reduce discharge time, then the state switching speed improves, but the device complexity increases
Solution Approach 1:
The patent combines the solenoid valve and discharge valve into an integrated valve assembly where both valves share common hydraulic passages and mounting structure. This merging approach allows the system to achieve rapid state switching through dual-valve operation while minimizing the increase in overall device complexity through shared components and compact arrangement.
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 reduces the time required to discharge hydraulic oil from the chamber, enabling faster switching between the parking lock and released states, thus improving the efficiency of the parking device's state transitions.
Implementation Method 1
an elastic member that exerts an elastic force to urge the movable member toward one side of the first direction
Implementation Method 2
a hydraulic pressure moves the movable member toward the other side of the first direction
Data Source
AI summary
A device includes a switching valve that performs switching between a first state of supplying a line pressure to an oil chamber defined by a case and a piston and a second state of discharging (draining) hydraulic oil in the oil chamber. The device also includes a drain check valve that closes (prohibits the hydraulic oil in the oil chamber from being discharged) when the line pressure is supplied to the oil chamber, and opens (allows the hydraulic oil in the oil chamber to be discharged) when the line pressure is not supplied to the oil chamber. The hydraulic oil is discharged from the oil chamber through the switching valve and the drain check valve.