Hydraulic Parking Lock Actuator With Single-Valve Pressure Control
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Solution Overview
Problem
Existing hydraulic parking lock systems are complex and costly due to the need for reversing pumps and multiple valves, which complicates the actuation of parking locks with double-acting pistons.
Innovation Solution
A simplified hydraulic parking lock actuation module using a single active actuation valve with a tank connection and a working pressure connection, utilizing different hydraulic pressure levels provided by a known hydraulic subsystem, eliminating the need for reversing pumps and additional valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reversing pump and double-acting piston are used to enable bidirectional actuation, then the parking lock can be actuated in both directions, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the reversing pump from the hydraulic system. By using a single-acting piston that only requires unidirectional hydraulic actuation, the complex reversing pump mechanism is removed entirely, simplifying the overall system while maintaining the ability to actuate the parking lock in the required direction
Solution Approach 2:
The patent replaces expensive, complex components (reversing pump, double-acting piston) with simpler, more cost-effective components (single-acting piston, standard hydraulic pump). This substitution reduces manufacturing costs and simplifies the system architecture
2Adaptability or versatility
If a reversing pump and multiple valves are used to control bidirectional actuation, then the parking lock can be actuated in both directions, but the manufacturing cost increases
Solution Approach 1:
The patent removes the reversing pump and reduces the number of required valves by using a single-acting piston design. This extraction of unnecessary components directly lowers manufacturing costs while maintaining sufficient actuation capability for the parking lock application
Solution Approach 2:
The patent substitutes expensive double-acting piston assemblies with simpler single-acting piston designs that are cheaper to manufacture. This replacement strategy reduces overall system cost while achieving the same functional outcome through a more economical design
3Device complexity
If a single-acting piston with one active actuation valve is used, then the device complexity and manufacturing cost are reduced, but the actuation capability is limited to one direction
Solution Approach 1:
Instead of using a double-acting piston that requires bidirectional hydraulic control, the patent inverts the approach by using a single-acting piston with unidirectional actuation. The mechanical return spring provides the reverse motion, eliminating the need for complex bidirectional hydraulic control while maintaining functional capability
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 simplifies the actuation of parking locks while maintaining functionality, reducing manufacturing costs, and providing a cost-effective locking mechanism using a single-acting piston and a 4/2-way valve.
Implementation Method 1
A low volume flow with a high pressure is provided for the hydraulic actuation of at least one hydraulic actuating element and the parking lock. A large volumetric flow is provided with a low pressure for cooling and/or lubrication.
Implementation Method 2
the parking lock piston can be actuated hydraulically in one actuating direction. The hydraulic actuation in one actuating direction moves the parking lock piston into an actuation position
Implementation Method 3
the locking device has a spring-pretensioned blocking element, which is dimensioned and arranged for engagement in a shape-contrasting recess
Implementation Method 4
the locking element is pretensioned into its locking position by a locking spring
Data Source
AI summary
A hydraulic parking lock actuation module for a parking lock with a parking lock piston, which can be hydraulically actuated in a parking lock cylinder from an initial position in an actuation direction by applying an actuation pressure, and which is mechanically coupled to an actuation rod which can be fixed via an engaging device in order to act as a locking mechanism for the parking lock piston. In order to simplify the actuation of the parking lock, for actuating the parking lock piston and the locking mechanism for the parking lock piston, the hydraulic parking lock actuation module includes only one active actuation valve with a tank connection and a working pressure connection at which different hydraulic pressure levels are applied.