Front Loader Hydraulic Switching Arrangement
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Solution Overview
Problem
Existing front loader systems for utility vehicles face inefficiencies in movement sequences due to conventional hydraulic arrangements, which require excessive hydraulic flow and lack adaptive pressure management, leading to suboptimal performance and increased operational costs.
Innovation Solution
A utility vehicle with a front loader featuring a swing arm cylinder connected to a hydraulic control system through a switching arrangement that adjusts between short-circuit and disconnected positions based on load pressure, reducing hydraulic volume and allowing for faster movement speeds while maintaining conventional operation by switching to separate cylinder chamber operation at defined pressure limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydraulic arrangements are used in front loader systems, then the system can maintain stable operation under various loads, but the hydraulic flow required is excessive and movement sequences are inefficient
Solution Approach 1:
The patent applies dynamics by making the hydraulic connection configuration adjustable between two states: connected and disconnected. The switching arrangement allows the system to dynamically change its hydraulic architecture based on operational requirements, enabling faster movement sequences when disconnected and stable force control when connected, thereby resolving the contradiction between productivity and hydraulic flow volume.
2Speed
If the switching arrangement operates in disconnected position for fast movement, then speed increases, but force control capability decreases
Solution Approach 1:
The system dynamically switches between disconnected mode (for high-speed movement with reduced hydraulic flow) and connected mode (for high-force load handling). This dynamic reconfiguration allows the front loader to optimize performance characteristics based on the current operational phase, resolving the speed-force trade-off contradiction.
Solution Approach 2:
The patent changes the hydraulic system's operational parameters by switching between two distinct connection states. When disconnected, the system operates with reduced hydraulic flow for speed; when connected, it operates with full hydraulic flow for force control. This parameter change approach enables the system to achieve both high speed and high force control at different times, resolving the contradiction.
3Ease of operation
If additional hydraulic lines or control electronics are added to improve hydraulic management, then control precision improves, but device complexity increases
Solution Approach 1:
The switching arrangement is designed to be integrated into the existing hydraulic system and operates automatically based on system pressure conditions. The arrangement uses the existing hydraulic medium and pressure differential to control the switching between connected and disconnected states, eliminating the need for additional control electronics or complex external systems. This self-service approach improves control precision while minimizing the increase in device complexity.
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
This solution optimizes movement sequences by reducing hydraulic flow during efficient operations and ensuring uninterrupted performance by automatically adjusting the hydraulic connections based on load pressure, enhancing efficiency and cost-effectiveness without requiring additional hydraulic lines or control electronics.
Implementation Method 1
the pump delivers hydraulic medium to the hydraulic connection in the direction of the rocker cylinder
Implementation Method 2
The boom cylinder is connected via these two hydraulic connections to working ports of a hydraulic control system
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
The invention relates to a commercial vehicle comprising a front loader with a mounting base for attaching the front loader to the commercial vehicle. A rocker arm is pivotally arranged on the mounting base. A hydraulic rocker cylinder (22) is supported on the mounting base and on the rocker arm. This rocker cylinder is designed as a double-acting lifting cylinder with two hydraulic connections (32, 34) via which the rocker cylinder is connected to working ports (40, 42) of a hydraulic control unit (44), which is connected to a hydraulic pump (46) and a hydraulic reservoir (48) containing a hydraulic medium.A hydraulic switching arrangement (50) with different switching positions is connected between the two hydraulic connections (32, 34) of the swing cylinder (22) and the pump (46) such that - in a short-circuit switching position of the switching arrangement (50) the two hydraulic connections (32, 34) of the swing cylinder (22) are hydraulically connected to each other, and - in a disconnect switching position of the switching arrangement (50) the two hydraulic connections (32, 34) of the swing cylinder (22) are hydraulically disconnected from each other.