Adjustable Hydraulic Pump Control Arm for Tracking Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydrostatic drive systems in agricultural machines face challenges in maintaining uniform tracking and steering due to manufacturing variations in pump output, leading to inconsistent acceleration and maneuverability.
Innovation Solution
An adjustable control arm assembly with a pivotal input shaft and an operator-controlled mechanism that allows for selective adjustment of the pivotal relationship between control arms, synchronizing the output of dual path hydrostatic pumps to achieve equal RPM across the operating range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed control rod linkage is used to adjust pump input, then the pump output can be matched at a given RPM, but the output cannot be synchronized across the entire operating range due to manufacturing variations
Solution Approach 1:
The control arm assembly incorporates adjustable linkages that allow dynamic modification of the control geometry. The linkages can be adjusted to compensate for manufacturing variations in pump output across the entire operating range, transforming a static fixed-linkage system into a dynamic adjustable one that maintains synchronization throughout variable RPM conditions.
Solution Approach 2:
The invention changes the geometric parameters of the control linkage system by allowing adjustment of the control arm assembly. This enables modification of the pivotal relationship between control arms to synchronize pump output across different operating conditions, addressing manufacturing variations through parameter adjustment rather than fixed design.
2Ease of operation
If dual path hydrostatic pumps are used for maneuverability, then turning radius is reduced, but uniform tracking and straight-line acceleration are compromised due to pump output variations
Solution Approach 1:
The adjustable control arm assembly enables the operator to adjust the linkage geometry based on observed pump performance variations. This feedback mechanism allows compensation for manufacturing tolerances in the pumps, ensuring uniform tracking and acceleration while maintaining the maneuverability benefits of dual path hydrostatic drive.
3Manufacturing precision
If the control linkage is made adjustable to compensate for pump variations, then synchronization across operating range is improved, but the device complexity increases
Solution Approach 1:
The control linkage is segmented into adjustable components, specifically the control arm assembly with adjustable linkages connecting the control rods to the pump input shafts. This segmentation allows selective adjustment of critical parameters while maintaining the overall simplicity of the control system architecture.
Data Source
AI summary
Adjustable control arms for dual path hydrostatic pumps have first and second arms interconnected by an eccentric mechanism with a common pivot point on a pivotal control input shaft for the pumps. The control arms are adjusted at a minimal pump output such as 500 r.p.m. by varying the eccentric to achieve equal r.p.m. The throw of the pump arms is adjusted at a maximum pump output r.p.m., such as approximately 4000 r.p.m., to achieve uniform tracking, steering, and directional control from the dual path hydrostatic pumps.