Three-Axis Tractor Hitch Layout for High Vertical Loads
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Solution Overview
Problem
Traditional hitch systems for agricultural tractors and trailers face issues with excessive play and component wear under high loads, particularly with larger tractors and heavier loads, and are often incompatible with servo-steering systems due to insufficient space for mechanical components.
Innovation Solution
A hitch system with a main connection assembly and adjustment assemblies for pitch, yaw, and roll, featuring a pitch axis offset towards the tractor to reduce forces on the drawbar and accommodate power steering mechanisms, allowing for adjustable and flexible coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional hitch systems with clearance-based pitch and roll are used, then pitching and rolling are ensured, but excessive play occurs especially with larger couplings and higher vertical loads
Solution Approach 1:
The patent changes the fundamental parameter of the hitch system from clearance-based movement to spherical joint-based movement. The spherical joint allows pitch and roll movements while maintaining constant contact between components, eliminating the excessive play that occurs in traditional clearance-based systems especially under high vertical loads
2Object-generated harmful factors
If ball-type hitches are used to reduce play, then play is minimized, but component wear increases under high loads
Solution Approach 1:
The patent transitions from a ball-type hitch with point contact to a spherical joint mechanism with extended spherical surfaces. This parameter change distributes the contact area and load across multiple points on the spherical surfaces, reducing wear on individual components while maintaining minimal play under high loads
3Ease of operation
If traditional hitch types are used, then coupling is achieved, but space for power steering mechanisms is insufficient
Solution Approach 1:
The patent repositions the pitch axis upstream of the yaw axis, creating a three-dimensional spatial arrangement that opens up space in the vertical and lateral dimensions. This dimensional reorganization provides sufficient clearance for power steering mechanisms while maintaining the coupling function
4Area of stationary object
If universal joint type solution with offset pitch axis is used, then space for power steering is increased, but forces on drawbar exceed design limits
Solution Approach 1:
The patent modifies the universal joint configuration by positioning the pitch axis upstream of the yaw axis rather than downstream. This parameter change in axis positioning alters the force transmission path, reducing the magnitude of forces transmitted to the drawbar while maintaining the spatial clearance needed for power steering mechanisms
Data Source
AI summary
A coupling system includes three axes to enable a trailer to be articulated in all directions when the trailer is hitched to a towing vehicle, such as a tractor. The pitch axis, which is either centered with the other two axes or is offset towards the tractor, limits the forces transmitted to the tractor drawbar in the case of a high vertical load. Thus, the coupling system with three offset axes provides the fundamental advantages of a universal joint but, by offsetting the pitch axis forward, the coupling system particularly and advantageously provides an additional and innovative solution whereby large vertical loads from certain machines towed on the tractor drawbar can be better withstood.