Adjustable Control Arm Assembly for Hydraulic Pump Displacement
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Solution Overview
Problem
Hydrostatic drive systems in agricultural machines face challenges in maintaining uniform pump output and tracking due to manufacturing variations, requiring different control arm lengths for various pump sizes, which complicates manufacturing and maintenance.
Innovation Solution
An adjustable control arm assembly with a pivotal input shaft, featuring a second arm with a slot, notch, and bore, and a half nut with a threaded adjustment rod, allowing for precise adjustment of the control arm throw to match different pump displacements without requiring mistake-proofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different control arm lengths are used for different pump sizes, then the pump output can be matched across various displacements, but the device complexity and manufacturing complexity increase due to needing to stock multiple parts
Solution Approach 1:
The control arm is designed with a universal structure that can accommodate multiple pump sizes through adjustment mechanisms. The second arm includes a slot with notches and a threaded bore that allows the control rod connection point to be repositioned, enabling a single control arm design to work with various pump displacements without requiring multiple specialized parts.
Solution Approach 2:
The control arm incorporates adjustable elements that allow the geometry to be modified dynamically. The threaded adjustment rod and half-nut assembly enables the control rod attachment position to be changed along the slot, providing adaptability for different pump sizes while maintaining a single standardized control arm component.
2Adaptability or versatility
If manual adjustment of control arms is performed, then pump output matching is achieved, but the adjustment process requires significant labor time and assembly time
Solution Approach 1:
The control arm is pre-configured with a standardized adjustment mechanism featuring threaded rods and pre-positioned notches. This preliminary preparation of the adjustment system allows for rapid modification during assembly or maintenance, significantly reducing the time required to match pump outputs compared to custom fabrication or complex adjustment procedures.
3Adaptability or versatility
If control arms are made adjustable to accommodate different pump displacements, then versatility improves, but the manufacturing precision requirements increase to ensure proper alignment and minimal backlash
Solution Approach 1:
The adjustment mechanism incorporates self-aligning features where the threaded rod engages with the half-nut and the slot geometry guides the control rod connection point. This self-service alignment reduces the need for high-precision manual alignment during assembly, as the mechanism inherently guides components into proper position while maintaining minimal backlash through the threaded engagement.
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
Enables positive, repeatable, and finite adjustment of control arm throw with minimal backlash, simplifying the setting process and reducing labor and assembly time, while accommodating various pump sizes, ensuring uniform performance across the operating range.
Implementation Method 1
a threaded adjustment rod being disposed within the bore of the second arm and being retained therein by way of a nut disposed in the notch, the threaded adjustment rod threadably engaging the threaded half bore of the half nut
Data Source
AI summary
A control arm assembly connected with a hydraulic pump allows for the adjustment of pump displacement by turning a threaded adjustment rod clockwise or counter-clockwise to move a half nut connected with a control rod vertically up or down in a slot of an arm to the desired set point. The half nut has a partial thread that engages the thread of the adjustment rod to control the vertical movement. The design allows for the positive repeatable finite adjustment of the half nut with minimal backlash that reduces the difficulty of the setting process in labor and assembly time. Once the desired set point has been met the adjustment rod is clamped tight to the second arm by tightening the nut against the notch to lock up the assembly to prevent any movement.