Tractor Hydraulic Valve Switching for Independent Consumer Operation
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Solution Overview
Problem
Existing agricultural tractors face challenges in efficiently operating multiple hydraulic consumers simultaneously due to complex and inconvenient solutions, such as using complex way valves or T-pieces, which impair the operation of one consumer when both are activated.
Innovation Solution
A hydraulic control valve arrangement with a 3/2-way valve that alternately functions as a feed or return line, connected to a first hydraulic coupler or a working chamber of a hydraulic cylinder, allowing independent operation of two hydraulic consumers, including a single-action or double-action hydraulic cylinder, with electric or mechanical actuation options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex way valves or T-pieces are used to operate multiple hydraulic consumers, then the number of hydraulic consumers that can be operated increases, but the system complexity and operational interference increase
Solution Approach 1:
The hydraulic system is segmented into separate functional paths: one path for the hydraulic cylinder (integrated with the tractor) and another path for external hydraulic consumers (via couplers). The 3/2-way valve segments the feed line to selectively direct hydraulic fluid to either the cylinder or the external consumer, avoiding the need for complex multi-way valves that would mix all paths together.
Solution Approach 2:
The 3/2-way valve acts as an intermediary device that mediates between the hydraulic control valve and the two possible consumers (cylinder or external hydraulic device). It provides a simple switching mechanism that prevents direct interference between the two consumers while maintaining full hydraulic control, thereby reducing system complexity compared to using complex way valves or T-pieces.
2Adaptability or versatility
If complex way valves or T-pieces are used to operate multiple hydraulic consumers, then the number of hydraulic consumers that can be operated increases, but operational interference between consumers occurs
Solution Approach 1:
The hydraulic system is segmented into separate functional paths: one path for the hydraulic cylinder (integrated with the tractor) and another path for external hydraulic consumers (via couplers). The 3/2-way valve segments the feed line to selectively direct hydraulic fluid to either the cylinder or the external consumer, avoiding the need for complex multi-way valves that would mix all paths together.
Solution Approach 2:
The return line from the external hydraulic consumer is extracted and connected directly to the second hydraulic connection of the hydraulic control valve, bypassing the 3/2-way valve. This extraction of the return path eliminates potential interference points where hydraulic fluid from different consumers could mix or where valve switching could affect return flow, thereby improving operational reliability.
3Device complexity
If traditional hydraulic systems are used without selective switching, then system simplicity is maintained, but convenience of operation for multiple consumers decreases
Solution Approach 1:
The system incorporates a dynamically switchable 3/2-way valve that can be actuated electrically or mechanically to change the hydraulic flow path. This dynamic switching capability allows the system to adapt its configuration based on operational needs, enabling convenient operation of multiple hydraulic consumers while maintaining overall system simplicity through a single, well-integrated switching mechanism.
Solution Approach 2:
The 3/2-way valve provides multi-functionality by serving as both a switching mechanism and a flow distribution device. It can direct hydraulic fluid to either the integrated cylinder or external consumers, and the system supports both electrical and mechanical actuation modes, making it universally applicable to different operational scenarios while maintaining ease of use.
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 convenient and efficient operation of two hydraulic consumers, such as a front loader and hydraulic lift, by blocking one consumer when not in use, thus preventing interference and simplifying operator control through electrical or manual actuation.
Implementation Method 1
a 3/2-way valve which connects the first hydraulic connection (14) selectively to a working chamber (34) of a hydraulic cylinder (30) in a first switching position or to a first hydraulic coupler (38) in a second switching position
Implementation Method 2
a hydraulic control valve (12) having a first (14) and second (16) hydraulic connection alternately acting as a feed line or return line for hydraulic fluid depending on an operating command
Data Source
AI summary
An arrangement for operating a hydraulic control valve for an agricultural tractor includes a first hydraulic connection and a second hydraulic connection of the hydraulic control valve alternately acting as a feed line or return line for hydraulic fluid depending on an operating command, a first and second hydraulic coupler for operating a hydraulic consumer attachable thereon, and a 3/2-way valve selectively connects the first hydraulic connection to a working chamber of a hydraulic cylinder in a first switching position and to the first hydraulic coupler in a second switching position, wherein the second hydraulic connection is connected directly to the second hydraulic coupler.