Lifting Gear Valve Arrangement Pressure Control
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Solution Overview
Problem
Conventional single-action rear lifting gears in tractors lack the ability to actively adjust bearing pressure, which is necessary for operating in 'pressing' modes such as active pulling of ploughs or changing tires, as they are not adapted to change pressure dynamically.
Innovation Solution
A lifting gear valve arrangement with a continuously adjustable directional control valve and pressure limiting valves allows for variable adjustment of bearing pressure by connecting pressure chambers to the lifting gear, enabling control of pressure in working lines to adapt to different operating states, including a maximum pressure adjustment range of 0 to 250 bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-action lifting gear is used, then the structure is simple and cost-effective, but the bearing pressure cannot be actively adjusted or changed
Solution Approach 1:
The patent applies a pressure limiting valve that can be dynamically adjusted to different pressure levels, transforming the static single-action lifting gear into a system with variable bearing pressure capability. The valve allows the bearing pressure to be actively changed according to operational requirements while maintaining the basic single-action structure.
Solution Approach 2:
The invention changes the pressure parameter of the hydraulic system by introducing an adjustable pressure limiting valve. This valve enables the bearing pressure to be varied within a specific range (0-250 bars), allowing the same lifting gear structure to adapt to different operational conditions through parameter adjustment rather than structural modification.
2Adaptability or versatility
If a double-action lifting gear is used, then active bearing pressure control is enabled, but the device complexity increases
Solution Approach 1:
The pressure limiting valve serves multiple functions: it limits maximum bearing pressure, allows pressure adjustment for different operational modes (pressing, carrying, floating), and can be integrated into existing single-action or double-action lifting gear systems. This multi-functionality reduces the need for separate control mechanisms for each operation mode.
Solution Approach 2:
The pressure limiting valve is designed to automatically regulate bearing pressure based on the adjusted setpoint, eliminating the need for complex manual intervention or additional control systems. The valve self-adjusts the pressure within the hydraulic line according to the operational state and pre-set parameters.
3Adaptability or versatility
If pressure is limited in the working line, then bearing pressure can be adjusted for different operating states, but the maximum pressure must be carefully controlled to prevent excessive forces
Solution Approach 1:
The pressure limiting valve creates a feedback mechanism where the bearing pressure is continuously monitored and automatically limited to the pre-adjusted maximum value. When the pressure approaches the set limit, the valve automatically restricts further pressure increase, preventing excessive forces while allowing full pressure adjustment capability for different operational requirements.
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
Enables precise and efficient control of bearing pressure, allowing the lifting gear to operate in both double-action and single-action modes with minimal effort, enhancing operational flexibility and safety, particularly in 'pressing' and 'carrying' modes.
Implementation Method 1
a—preferably proportionally—adjustable pressure limiting valve or the like is provided in a working line, which enables the pressure in this working line to be limited to a modifiable maximum value
Implementation Method 2
a continuously adjustable directional control valve with one or a plurality of upstream or downstream pressure compensators. Two working connections of the lifting gear valve arrangement are connected with the pressure chambers of the lifting gear
Data Source
AI summary
Disclosed is a lifting gear valve arrangement for controlling a double-action lifting gear or an add-on unit with a continuously adjustable directional control valve and with an individual pressure compensator via which a pressure medium volume flow to and from a lifting cylinder of the lifting gear can be controlled. A proportionally adjustable pressure limiting valve is provided in the pressure medium flow path between an outlet connection of the directional control valve and a working connection of the lifting gear valve arrangement, via which the pressure inside this area can be limited to a maximum value. The adjustment of the pressure limiting valve is preferably performed as a function of the operating states of the lifting gear or of the type of add-on unit.