Reversing Planetary Gear Drive for Irrigation Sprinkler Torque Management
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Solution Overview
Problem
Conventional rotor-type sprinklers face issues with the reversing mechanism, including complex assembly, operational failures, and weak spring force leading to pinion gear breakage or wear, particularly in large area irrigation systems where high torque is required.
Innovation Solution
The implementation of a reversing planetary gear drive with a bi-level shift sun gear and external reversing mechanism, which transitions gears between operative positions to reverse the rotation of the nozzle, reducing torque and wear, and allowing for smooth shifting and high rotational torque delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reversing frame design with pinion gears and Omega-shaped over-center springs is used, then the reversing mechanism can be implemented, but the spring force is relatively weak leading to pinion gear breakage, wear, or stripping during operation
Solution Approach 1:
The patent changes the spring configuration from single Omega-shaped over-center springs to multiple coil springs arranged radially around the control shaft. This parameter change increases the total spring force available to engage the pinion gears with the bull gear, preventing gear breakage and wear while maintaining the reversing mechanism's functionality.
Solution Approach 2:
The reversing mechanism is divided into separate functional components: the control shaft, multiple independent coil springs, pinion gears, and bull gear. This segmentation allows each component to be optimized independently, with the springs providing sufficient engagement force without compromising the overall mechanism's reliability.
2Ease of operation
If four pinion gears meshed together with Omega-shaped over-center springs are used, then the reversing mechanism can reverse rotation, but the assembly becomes complicated with many parts leading to operational failures
Solution Approach 1:
The patent merges the reversing function into a more integrated arrangement where the control shaft directly controls the engagement of pinion gears with the bull gear through radial coil springs. This consolidation reduces the number of separate components compared to the traditional reversing frame design, simplifying the assembly while maintaining the reversing capability.
Solution Approach 2:
The control shaft acts as an intermediary component that mediates between the water flow input and the pinion gear engagement. By using the control shaft to transmit rotational motion and control spring engagement, the system achieves reversing function with fewer parts and reduced assembly complexity.
3Ease of operation
If a long metal shaft that can twist relative to components rigidly mounted on the shaft is used in the reversing stator design, then the reversing mechanism can function, but the reverse point changes undesirably and good repeatable arc shift points are not achieved
Solution Approach 1:
The patent employs radial coil springs that provide pre-compression and cushioning forces to maintain stable engagement between the pinion gears and bull gear. This beforehand cushioning prevents shaft twist and ensures consistent reverse points, achieving repeatable arc shift precision without the stability issues of rigidly mounted components.
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 design enhances the reliability and durability of rotor-type sprinklers by reducing the likelihood of gear damage and wear, enabling efficient and uniform rotation of the nozzle in both directions, suitable for large area irrigation systems that require high water discharge and coverage.
Implementation Method 1
A turbine and a gear train reduction are mounted in the riser for rotating a nozzle turret
Implementation Method 2
a coil spring. The case is buried in the ground and when pressurized water is fed to the sprinkler the riser extends
Data Source
AI summary
A sprinkler can include a turbine, a nozzle, a gear drive and a reversing mechanism. The gear drive and the reversing mechanism rotatably couple the turbine and the nozzle. The gear drive can shift a direction of rotation of an output stage that is coupled to the reversing mechanism. The reversing mechanism can include a shift member coupled with the gear drive.