Agricultural Pickup Caster Wheel Spring Biasing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing caster wheel assemblies for agricultural machines do not provide sufficient freedom of rotation and alignment during transportation and maneuvering, leading to increased width issues on public roads and limited maneuverability, especially when navigating uneven terrain.
Innovation Solution
A caster wheel assembly with a wheel mounted on a carrier shaft within a bushing of a pickup arm, biased by a spring that is mounted over the pickup arm between a first arm fixed to the carrier shaft and a second arm fixed to the pickup arm, allowing 360 degrees of rotation and alignment during road transport and maneuvering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the caster wheel is mounted on a pivot arm assembly with spring biasing, then the wheel aligns automatically with the direction of travel during operation, but the wheel cannot rotate more than 180 degrees from its initial position, limiting maneuverability when moving backwards on uneven terrain
Solution Approach 1:
The patent applies the dynamics principle by making the spring mounting position adjustable rather than fixed. The spring can be repositioned along the pivot arm assembly to different locations, which dynamically changes the mechanical advantage and rotation limits. This allows the system to adapt between providing strong alignment force during forward operation and allowing greater rotation freedom when maneuvering backwards, resolving the contradiction between ease of operation and adaptability.
2Ease of operation
If the caster wheel is designed to pivot freely about a vertical caster axis, then the wheel can rotate to align with the direction of travel, but when raised off the ground during transportation, the wheel can move to a position that projects laterally beyond the sides of the pickup, increasing width beyond legal limits
Solution Approach 1:
The patent applies preliminary anti-action by using a spring biasing mechanism that proactively prevents the wheel from rotating to excessive positions. The spring is pre-positioned to exert a restoring force that counteracts the tendency of the wheel to project laterally beyond legal limits during transportation. This preliminary counter-force ensures the wheel remains within acceptable width boundaries without requiring active control or external intervention.
3Stability of the object's composition
If the spring is mounted below an arm of the frame to bias the carrier into a predetermined direction, then the support wheel orients correctly during road transport, but the spring limits the range of rotation of the wheel, preventing rotation more than 180 degrees from initial position
Solution Approach 1:
The patent applies the dynamics principle by making the spring mounting position adjustable rather than fixed. The spring can be repositioned along the pivot arm assembly to different locations, which dynamically changes the mechanical advantage and rotation limits. This allows the system to adapt between providing strong alignment force during forward operation and allowing greater rotation freedom when maneuvering backwards, resolving the contradiction between ease of operation and adaptability.
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 allows the caster wheel to align properly during road transport and provides full 360-degree rotation, ensuring the wheel does not project excessively and facilitating smooth maneuvering both forward and backward, addressing the limitations of existing designs.
Implementation Method 1
Each carrier is connected by a respective spring to a point fixed relative to the frame of the pickup, the spring biasing the carrier to cause the support wheel to be oriented in a predetermined direction relative to the frame of the pickup.
Data Source
Figure 1~2
Figure 3
AI summary
A caster wheel assembly of a pickup for an agricultural machine, comprising a wheel (11, 21) on a carrier shaft (14, 24) mounted rotatably within a bushing (13, 23) of a pickup arm(10, 20), the wheel (11, 21) being biased by a spring (16, 26) to be oriented in a predetermined direction relative to the pickup arm (10, 20). The spring (16, 26) is mounted over the pickup arm between a first arm (15, 25) fixed to the carrier shaft (14, 24) and a second arm (18, 28) fixed to the pickup arm (10, 20).