Drawbar Self-Locking Tilting Protrusion Prevents Load Disconnection
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Solution Overview
Problem
The connection between the attachment and longitudinal support in drawbars can suddenly disconnect, leading to hazardous uncontrolled load disconnection, especially when space is limited at the rear of agricultural tractor vehicles.
Innovation Solution
A drawbar design featuring a longitudinal support and an attachment with a self-locking tilting protrusion that forms a drawbar eye receiver, which absorbs lifting forces and relieves the connecting means before total failure, allowing for secure attachment and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the attachment is arranged beneath the longitudinal support to save space, then the space utilization is improved, but the connection reliability deteriorates due to lifting forces causing sudden disconnection
Solution Approach 1:
The tilting protrusion is designed to be movable relative to the recess, allowing it to tilt dynamically in response to lifting forces. This dynamic adjustment enables the connection to maintain reliability under varying load conditions while preserving the space-saving arrangement of the attachment beneath the longitudinal support.
Solution Approach 2:
The system changes the positional parameter of the tilting protrusion within the recess based on the magnitude of lifting forces. When lifting forces are present, the protrusion tilts to a different position than when no lifting forces act, thereby adapting the connection geometry to maintain reliability across different operating conditions.
2Reliability
If the attachment is fixed rigidly to prevent disconnection, then the connection reliability is improved, but the ease of maintenance deteriorates due to difficulty in removal
Solution Approach 1:
The tilting protrusion provides a dynamic connection that is rigid under normal operating conditions (preventing disconnection) but allows easy release when maintenance is needed. The tilting mechanism enables controlled disengagement by overcoming the self-locking effect, balancing reliability with maintainability.
3Strength
If the connecting means are strengthened to prevent failure, then the connection strength is improved, but the device complexity increases
Solution Approach 1:
The tilting protrusion automatically adjusts its position and engagement depth based on the applied lifting forces, providing self-regulating strength without requiring additional strengthening components. This self-adjusting mechanism maintains connection strength while avoiding increased 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
The design provides high mechanical security against undesirable load disconnection, allowing for space-efficient arrangement on tractor vehicles and enabling easy removal for maintenance, while preventing sudden load disconnection and allowing for plastic deformation detection before failure.
Implementation Method 1
prior to the tearing of the connecting means and a resulting total failure a plastic deformation area of the attachment occurs
Implementation Method 2
the at least one tilting protrusion is arranged in a recess of the longitudinal support in a self-locking manner against a lifting force
Data Source
AI summary
A drawbar for a towing vehicle includes a longitudinal support and an attachment which is removably fixed to the longitudinal support. The longitudinal support and the attachment form a towing-eye receiving area, and the longitudinal support and the attachment each have a receiving opening for a coupling pin. The attachment has at least one tilting protrusion which is arranged in a recess of the longitudinal support in a self-locking manner relative to a removal force in the direction of the central line of the coupling pin.