Integrated Oil Pump and Parking Lock Actuator Packaging
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Solution Overview
Problem
Existing hydraulic systems for automobiles, which integrate a motor, an electric oil pump, and a hydraulic actuator, face challenges in downsizing while maintaining functionality, particularly for space-restricted applications like parking lock actuators.
Innovation Solution
An integrated pump device that combines a motor, an oil pump, and a rotary hydraulic actuator, where the oil pump discharges oil to drive the hydraulic actuator, which switches between advance and retard states, thereby reducing the overall size of the hydraulic actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a motor, electric oil pump, and hydraulic actuator are integrated into a single module, then the overall system size is reduced, but the complexity of the integrated design increases
Solution Approach 1:
The patent integrates the motor, electric oil pump, and hydraulic actuator into a single compact module. The motor and oil pump share a common housing structure, and the hydraulic actuator is directly coupled to the motor output shaft, eliminating the need for separate mounting brackets and connection pipes, thereby reducing overall system volume while managing design complexity through functional integration.
Solution Approach 2:
The motor serves dual functions: directly driving the hydraulic actuator through its output shaft and simultaneously driving the electric oil pump through a belt connection. This multi-functionality reduces the need for separate driving mechanisms, contributing to compact system size while requiring coordinated control design.
2Volume of moving object
If the hydraulic actuator uses a vane rotor with vanes in advance and retard chambers, then the actuator achieves compact size and efficient operation, but the manufacturing precision requirements increase
Solution Approach 1:
The hydraulic actuator is divided into distinct functional zones: advance chambers, retard chambers, and a vane rotor with precisely fitted vanes. The housing includes separate advance chamber ports and retard chamber ports that communicate with corresponding chambers, allowing modular manufacturing and assembly while maintaining tight tolerances only where critical for hydraulic sealing.
Solution Approach 2:
The patent uses hydraulic pressure differential between advance and retard chambers to drive the vane rotor. Oil supplied to the advance chamber creates pressure that pushes the vanes against the rotor surface, generating rotational torque. The hydraulic system's inherent pressure control mechanisms help compensate for minor manufacturing variations in chamber volumes and port alignments.
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 integrated design allows for a compact hydraulic actuator that effectively operates a parking lock mechanism, achieving the necessary operational states while minimizing space requirements.
Implementation Method 1
The oil pump discharges oil drawn from an oil pan by a driving force of the motor
Implementation Method 2
When the hydraulic pressure in the advance chamber is higher than in the retard chamber, the vane rotor rotates in one direction to enter the advance state; and when the hydraulic pressure in the retard chamber is higher than in the advance chamber, the vane rotor rotates in the other direction to enter the retard state
Data Source
AI summary
An integrated pump device includes a motor, an oil pump rotated by a driving force of the motor and configured to discharge oil drawn from an oil pan, and a hydraulic actuator configured to switch between an advance state and a retard state by a hydraulic pressure created by the oil pump. The hydraulic actuator is a parking lock actuator, and includes a housing having vane chambers and a vane rotor housed in the housing and including vanes arranged in the vane chambers. The vane rotor is configured to rotate to enter the advance state when the hydraulic pressure is supplied to an advance chamber, and to rotate to enter the retard state when the hydraulic pressure is supplied to a retard chamber. The parking lock actuator locks a parking lock mechanism at the advance state, and unlocks the parking lock mechanism at the retard state.