Dual Spring Crop Pickup Reel Torque Balance
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Solution Overview
Problem
Existing crop intake devices for agricultural harvesters face challenges in maintaining consistent torque and weight distribution when changing the height of the reel, leading to reduced performance and potential bouncing issues.
Innovation Solution
The improved crop intake device features a dual suspension spring system, where the first suspension spring's torque increases with the reel's height, and the second suspension spring provides additional lifting torque to support the increased weight, ensuring consistent weight distribution and reduced bouncing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single compression spring is used for suspension, then the device complexity is reduced and manufacturing cost is lowered, but the torque on the crop pickup unit becomes inconsistent when changing reel height
Solution Approach 1:
The suspension system is divided into two separate springs (first suspension spring and second suspension spring) that work together. The first spring provides primary suspension while the second spring compensates for torque variations, allowing each spring to have optimized functions rather than requiring one complex spring to handle all requirements.
Solution Approach 2:
The system changes the spring arrangement parameters by positioning the first spring at a first perpendicular distance from the pivot point and the second spring at a second perpendicular distance. This parameter variation allows the torque characteristics to be optimized across different reel heights, maintaining consistent lifting torque despite height changes.
2Productivity
If the reel height is increased to improve crop pickup performance, then the centre of gravity moves away from the pivot point requiring more torque, but the compression spring torque decreases due to increased distance and reduced spring force
Solution Approach 1:
The second suspension spring acts as a counterbalancing element that compensates for the torque deficit created by the first spring's reduced leverage. As the reel height increases and the centre of gravity moves away from the pivot point, the second spring provides additional lifting torque to counteract the increased moment arm effect.
Solution Approach 2:
The suspension system is designed to be dynamic in its torque contribution - the second spring's torque varies with reel height to compensate for the changing centre of gravity position. This dynamic adjustment ensures that sufficient lifting torque is available across the full range of reel heights without requiring a fixed, over-designed spring system.
3Adaptability or versatility
If the support wheels are pivoted to adjust reel height, then the working height can be adapted to different field conditions, but the perpendicular distance from the suspension spring to the pivot point changes causing torque variation
Solution Approach 1:
The system deliberately uses different perpendicular distances for the two springs (first perpendicular distance for the first spring, second perpendicular distance for the second spring). This parameter differentiation allows the torque characteristics to be optimized across different reel heights and support wheel positions, maintaining consistent lifting torque despite height adjustments.
Solution Approach 2:
The second suspension spring essentially copies and reinforces the function of the first spring, providing additional lifting torque that compensates for the reduced leverage of the first spring. This redundant spring arrangement ensures that the overall torque output remains consistent even when geometric parameters change due to height adjustment.
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
This solution effectively maintains a consistent weight distribution and torque across varying reel heights, enhancing the stability and performance of the crop intake device, particularly when the reel is raised.
Implementation Method 1
a first suspension spring coupled between the frame and the crop pickup unit such that a perpendicular distance between the first suspension spring and a pivot point of the crop pickup unit on the frame increases when moving the reel towards the raised configuration
Implementation Method 2
the lifting torque provided by the first suspension spring increases as the reel is raised
Implementation Method 3
a second suspension spring coupled between the frame and the crop pickup unit such that the lifting torque provided by the second suspension spring on the crop pickup unit increases when moving the reel towards the raised configuration
Implementation Method 4
the lifting torque provided by the second suspension spring on the crop pickup unit increases when moving the reel towards the raised configuration
Implementation Method 5
the support wheels rest on the ground, this pivoting relative to the reel causes the reel to move up and down to the predetermined height
Data Source
AI summary
A crop intake device for an agricultural harvester includes a frame and a crop pickup unit, pivotably mounted to the frame. The crop pickup unit includes a rotatable reel, at least one support member, and first and second suspension springs. The reel has tines configured for picking up crop from a field. The support member is arranged for supporting the crop pickup unit on the field during use, and is pivotable relative to the reel for setting a minimum height of the tines by moving the reel between a lowered configuration and a raised configuration. A perpendicular distance between the first suspension spring and a pivot point of the crop pickup unit on the frame increases when moving the reel towards the raised configuration. A lifting torque provided by the second suspension spring on the crop pickup unit increases when moving the reel towards the raised configuration.