Bidirectional Pump Parking Lock Hydraulic Circuit
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Solution Overview
Problem
Hydraulic actuating systems for motor vehicle parking locks require expensive and sensitive 4/2-way slide valves, which are prone to contamination, and additional locking latching means, increasing component and installation space requirements.
Innovation Solution
A hydraulic actuating system using a bidirectional pumping device with passive check valves in a hydraulic circuit, allowing the selection of delivery direction to control the actuation of the parking lock, eliminating the need for a 4/2-way slide valve and incorporating a hydraulic supply section for cooling and lubricating oil, with a control valve for managing oil flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 4/2-way slide valve is used to control the hydraulic circuit, then the parking lock can be actuated in different positions, but the system becomes expensive and sensitive to contaminations
Solution Approach 1:
The patent removes the 4/2-way slide valve from the hydraulic circuit and replaces it with a bidirectional pumping device. This extraction eliminates the sensitive valve component that is prone to contamination, while the pumping device's delivery direction selection achieves the same functional outcome of directing hydraulic flow to different line sections.
Solution Approach 2:
The patent replaces the mechanical slide valve system with a bidirectional pumping device controlled by an electronic control unit. This substitution changes the control mechanism from mechanical valve switching to electronic control of pump delivery direction, eliminating the need for complex valve mechanisms that are sensitive to contaminants.
2Reliability
If a locking latching means is added to prevent the actuator from being pressed back, then the parking lock can be securely locked, but the component and installation space requirements increase
Solution Approach 1:
The patent utilizes the inherent bidirectional capability of the pumping device to provide both locking and releasing functions. The system serves itself by using the same component (bidirectional pump) to achieve both locking security and release capability, eliminating the need for separate locking latching means and reducing overall system complexity.
Solution Approach 2:
The bidirectional pumping device performs multiple functions: it can deliver hydraulic pressure in a first direction to lock the parking lock, and in a second direction to release it. This multi-functionality eliminates the need for separate locking and releasing mechanisms, reducing component count and installation space while maintaining reliable locking security.
3Device complexity
If a bidirectional pumping device with check valves is used instead of a slide valve, then the system becomes simpler and more robust, but additional components are introduced
Solution Approach 1:
The patent combines the functions of the slide valve and the locking latching means into a single bidirectional pumping device with check valves. By merging these functions into one integrated component, the overall system complexity is reduced even though the pumping device itself has multiple internal components, as it replaces multiple separate components (slide valve + locking mechanism).
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 system reduces component complexity, susceptibility to faults, and installation space while enabling precise control of the parking lock's engagement and release, and efficient oil supply management, making it robust, inexpensive, and less sensitive to dirt.
Implementation Method 1
a pumping device for generating a hydraulic pressure which transfers the parking lock into the locked position or the released position
Implementation Method 2
a hydraulic circuit, via which the pumping device is connected to the actuator
Implementation Method 3
check valves are arranged in the hydraulic circuit in such a way that, by way of actuation of the pumping device in the locking delivery direction
Data Source
AI summary
In order to provide a hydraulic actuating system for actuating a parking lock of a motor vehicle, which hydraulic actuating system manages with as few components as possible which are simple, robust, relatively insusceptible to faults and inexpensive, with a simultaneously low installation space requirement, and the hydraulic layout of which hydraulic actuating system makes a simple actuation and a simple movement possible for locking and unlocking the parking lock, it is provided that a pumping device which can operate bidirectionally with a locking delivery direction and with a releasing delivery direction is used as pumping device, and check valves are arranged in the hydraulic circuit in such a way that, by way of actuation of the pumping device in the locking delivery direction, the parking lock moves into the locked position and, upon actuation of the pumping device in the releasing delivery direction, the parking lock moves into the released position.