Agricultural Pickup Caster Wheel Assembly with Spring Bias
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Solution Overview
Problem
Existing caster wheel assemblies for agricultural machines lack sufficient freedom of rotation and alignment during both forward and backward maneuvering, leading to increased width issues during transportation on public roads and limited mobility on uneven terrain.
Innovation Solution
A caster wheel assembly featuring a wheel mounted on a carrier shaft within a bushing of a pickup arm, biased by a helical spring that allows at least 270 degrees of rotation, ensuring proper alignment and dampening during field operation and road transport, while maintaining flexibility for maneuvering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the caster wheel is allowed to rotate freely when raised off the ground during transport, then the wheel can align automatically with the direction of travel during field operation, but the wheel projects laterally beyond the sides of the pickup increasing width beyond legally permissible limits
Solution Approach 1:
A spring mechanism is pre-configured to bias the carrier shaft against a stop, preventing the wheel from rotating into positions that would exceed legal width limits during transport. This preliminary constraint counteracts the natural tendency of the free-rotating caster wheel to project laterally, resolving the contradiction between automatic alignment capability and transport width compliance.
2Length of moving object
If the spring is mounted to limit the range of rotation of the wheel to prevent excessive width during transport, then the wheel stays within legal limits, but the wheel cannot rotate substantially more than 180 degrees causing problems when manoeuvring backwards on uneven terrain
Solution Approach 1:
The stop mechanism is designed with asymmetric geometry that provides different rotational constraints depending on the direction of travel. When moving forwards, the stop limits rotation to prevent excessive width. When moving backwards, the stop geometry allows greater rotational freedom (at least 270 degrees) to accommodate uneven terrain and reverse maneuvering requirements, thus dynamically adapting to different operational conditions.
3Length of moving object
If the wheel is constrained to a predetermined direction during transport, then the width remains within legal limits, but the wheel lacks freedom of rotation for proper alignment during field operation
Solution Approach 1:
The spring-bias mechanism creates a dynamic system where the wheel is constrained to a predetermined direction during transport (when raised off the ground), but gains freedom of rotation during field operation (when the pickup weight applies to the wheels). The spring allows controlled movement while maintaining transport positioning, enabling the wheel to align automatically with the direction of travel during field use while preventing excessive width during transport.
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 solution provides improved wheel orientation and mobility, preventing excessive width during transport and enhancing maneuverability on uneven terrain by allowing greater rotational freedom and alignment with the direction of travel.
Implementation Method 1
the spring is a helical spring mounted coaxially with the carrier shaft between the wheel and the pickup arm. The helical spring is attached at its one end to the carrier shaft and at its second end to the bushing
Implementation Method 2
The caster wheel assembly according to the invention allows dampening the movement of the wheel during field operation
Data Source
AI summary
A caster wheel assembly of a pickup for an agricultural machine, comprising a wheel (11, 41) on a carrier shaft (14, 24, 34, 44) mounted rotatably within a bushing (13, 23, 33, 43) of a pickup arm (10, 20, 40). The wheel (11, 41) is biased by a spring (16, 26, 36, 46) to be oriented in a predetermined direction relative to the pickup arm. The spring (16, 26, 36, 46) is a helical spring mounted coaxially with the carrier shaft (14) between the wheel and the pickup arm (10).