Hydraulic Three-Point Hitch for High-Speed Transport Shock Absorption
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Solution Overview
Problem
Existing three-point hitches for tractors experience damage due to excessive stress during transport at high speeds, particularly when road irregularities cause vertical accelerations, which existing damping systems fail to adequately mitigate.
Innovation Solution
A three-point hitch with a hydraulic damper and upper device that limits forces beyond a predetermined threshold, incorporating a hydraulic accumulator system for efficient shock absorption during transport, allowing the hitch to function rigidly during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the machine is transported at high speeds (up to 60 km/h), then transport efficiency is improved, but excessive stress and shocks are transmitted to the three-point linkage, potentially damaging components
Solution Approach 1:
The hydraulic damper is pre-installed in the upper device of the three-point hitch to cushion shocks before they reach the tractor and machine. The damper is positioned to absorb vertical accelerations during transport, preventing excessive forces from being transmitted to the linkage components.
Solution Approach 2:
The hydraulic damper acts as an intermediary element between the machine and the tractor's three-point linkage. It mediates the force transmission by absorbing and dissipating shock energy, allowing high-speed transport without damaging the linkage while maintaining connection integrity.
2Reliability
If damping systems are added to reduce shocks, then component protection is improved, but device complexity and cost increase
Solution Approach 1:
The upper device of the three-point hitch is designed to perform multiple functions: it provides the structural connection between machine and tractor, enables lifting and positioning operations, and incorporates the hydraulic damper for shock absorption. This multi-functionality avoids adding separate damping components, reducing overall system complexity.
Solution Approach 2:
The hydraulic damper is merged with the upper device structure of the three-point hitch. The damper is integrated into the existing linkage mechanism rather than being added as a separate auxiliary system, simplifying the overall design and reducing component count while maintaining protective functionality.
3Force
If the upper device limits forces beyond a predetermined threshold, then stress peaks are reduced, but the device must be designed to handle both rigid operation during work and flexible damping during transport
Solution Approach 1:
The upper device is designed with dynamic characteristics that allow it to behave differently under different operating conditions. During normal work operations, the device maintains rigid connection for precise control. During transport with vertical accelerations, the hydraulic damper activates to provide flexible shock absorption, automatically adapting to the operational phase without requiring manual intervention or complex control systems.
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
Protects the machine and tractor from excessive stress, extending component lifespan and enabling efficient work and rapid transport without damage.
Implementation Method 1
The upper device includes a hydraulic damper equipped with a cylinder, configured to limit the forces transmitted by the upper device to the tractor beyond a predetermined force
Implementation Method 2
said hydraulic damper may include a hydraulic accumulation system coupled to at least one unidirectional flow restriction
Data Source
Figure 1~2
AI summary
[The present invention relates to a three-point hitch for connecting a machine (3) to a tractor (5), comprising two lower arms (1) configured to be fixed by a rigid attachment at two points called lower (2) of the machine (3), and by a lower link (4) articulated to the tractor (5), and an upper device (6) configured to connect a third point (7) of the machine (3) located higher than the two points called lower (2), to a point of a lifting device of the tractor (5). Said upper device (6) of this hitch includes a hydraulic damper (8) equipped with a cylinder (9), configured to limit the forces transmitted by the upper device (6) to the tractor (5) beyond a predetermined force.]