Reversing Pump Hydraulic Assembly Without Active Valves
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Solution Overview
Problem
Existing hydraulic systems with reversing pumps are costly to produce and require active valves for actuation, which increases complexity and costs.
Innovation Solution
A hydraulic system with a reversing pump that eliminates the need for active valves by using a valve assembly with mechanically coupled pistons and a locking device, allowing for bidirectional actuation and efficient supply to cooling and lubrication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If active valves are used for bidirectional actuation in a hydraulic system with a reversing pump, then the actuation function is achieved, but the device complexity and production costs increase
Solution Approach 1:
The patent merges the functions of the actuating piston and valve piston into a single integrated component. The actuating piston is directly coupled to the valve piston, eliminating the need for separate active valves. This integration simplifies the valve assembly while maintaining bidirectional actuation capability through the reversing pump's two delivery connections.
Solution Approach 2:
The integrated piston serves multiple functions simultaneously: it acts as both the actuating piston for the actuating element and the valve piston for controlling hydraulic flow direction. This multi-functionality eliminates the need for separate active valves, reducing device complexity while achieving bidirectional actuation.
2Adaptability or versatility
If a reversing pump with two delivery connections is used to supply both actuation and cooling/lubrication systems, then both functions are served, but the system complexity increases
Solution Approach 1:
The reversing pump is designed with two delivery connections that serve dual purposes: one connection supplies hydraulic medium for bidirectional actuation of the actuating element, while the other connection supplies the cooling and/or lubrication system. This multi-functional design allows a single pump to serve multiple system requirements without requiring additional pumps or complex distribution mechanisms.
Solution Approach 2:
The hydraulic system is segmented into distinct functional pathways through the two delivery connections of the reversing pump. Each connection independently supplies a specific function (actuation or cooling/lubrication), allowing for simplified routing and control of hydraulic medium to different system components.
3Ease of operation
If non-return valves are used to control hydraulic medium flow direction, then flow control is achieved, but pressure loss increases
Solution Approach 1:
The system uses the reversing pump's inherent bidirectional delivery capability to self-regulate flow direction without requiring active valves or complex non-return valve assemblies. The pump automatically directs hydraulic medium to the appropriate delivery connection based on the required actuation direction, minimizing pressure losses associated with passive flow control mechanisms.
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 production costs by eliminating the need for active valves, while maintaining efficient bidirectional actuation and ensuring sufficient hydraulic medium supply to cooling and lubrication systems without significant pressure loss.
Implementation Method 1
a first delivery connection of the reversing pump is fluidly connected to a first tank non-return valve (17) blocking in the direction of the tank and to a first pressure connection (27) of the double-acting actuating cylinder (12), a second delivery connection of the reversing pump is fluidly connected to a second tank non-return valve (18) blocking in the direction of the tank and to a second pressure connection (28) of the double-acting actuating cylinder (12)
Data Source
AI summary
The disclosure relates to a hydraulic system including a reversing pump which has two delivery connections via which a hydraulic medium can be delivered from a tank in opposite delivery directions in order to hydraulically actuate an actuating element and supply a cooling and/or lubricating system. The hydraulic system also includes a valve assembly via which an actuating piston in a double-acting actuating cylinder can be supplied with hydraulic medium.A first delivery connection of the reversing pump is fluidly connected to a first pressure connection of the double-acting actuating cylinder. A second delivery connection of the reversing pump is fluidly connected to a second pressure connection of the double-acting actuating cylinder. The actuating piston is mechanically coupled to a valve piston of a valve, and the valve piston is mechanically coupled to a locking device and to the actuating element.