Hydraulic Sickle Knife Drive With Reverse Flow Jam Clearing
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Solution Overview
Problem
The existing cutter bar systems in agricultural harvesters face challenges in accommodating varying crop conditions and ground speeds due to limitations in the operating parameters of hydraulic motor-driven reel drive assemblies, which can hinder efficient harvesting and crop clearing.
Innovation Solution
A sickle knife drive system comprising a drive manifold, first and second pumps, and motors, allowing for three system states (forward, reverse, and neutral) to optimize the operation of sickle knives, with the drive manifold fluidly connected to the combine and capable of providing different flow rates for harvesting and clearing modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic motor-driven reel drive assembly is used to rotate the reel, then the reel can be rotated at variable speeds to accommodate different crop conditions and ground speeds, but the operating parameters of the hydraulic motor prevent adequate accommodation of some crop conditions
Solution Approach 1:
The patent replaces the hydraulic motor-driven reel drive assembly with a sickle knife drive system that uses a mechanical power transmission device (PTO) connected to a pump, which drives a motor to reciprocate the sickle knives. This substitution eliminates the limitations of hydraulic motor operating parameters and provides more reliable crop clearing capability.
Solution Approach 2:
The patent changes the operating parameters from hydraulic motor speed/pressure control to a mechanical PTO-driven system with pump flow control. The system provides three distinct states (forward harvesting, reverse clearing, neutral) with specific flow rate ranges, ensuring adequate performance across different crop conditions without the limitations of hydraulic motor parameters.
2Productivity
If a mechanical drivetrain is used to power the cutter bar, then rotary motion is converted to linear motion effectively, but the system lacks the ability to provide reverse motion for clearing clogged crop material
Solution Approach 1:
The patent transforms the static unidirectional mechanical drivetrain into a dynamic bidirectional system. The pump can be driven in forward and reverse directions by the PTO, and the motor can reciprocate the sickle knives back and forth, enabling both harvesting and clearing operations with a single integrated system.
Solution Approach 2:
The sickle knife drive system serves multiple functions: forward motion for harvesting, reverse motion for clearing clogged material, and neutral position for idle or transport. This multi-functionality eliminates the need for separate clearing mechanisms and improves overall system versatility.
3Device complexity
If a hydraulic system with fixed operating parameters is used, then the system structure is simple, but it cannot adapt to varying crop conditions and ground speeds
Solution Approach 1:
The patent introduces dynamic adaptability through a pump-controlled system where flow rates can be varied within specific ranges (10-20 GPM forward, 5-15 GPM reverse). This allows the system to adapt to different crop conditions and ground speeds while maintaining a relatively simple hydraulic structure compared to fully variable systems.
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 sickle knife drive system enhances the efficiency of crop cutting and clearing by allowing adaptive operation based on crop conditions and ground speed, ensuring consistent flow rates and supplementing fluid pressure for effective harvesting and jam clearance.
Implementation Method 1
The first pump creates a system state, e.g. a forward state, a reverse state and a neutral state. The drive manifold has a forward position during the forward state, a reverse position during the reverse state and either the forward position or the reverse position during the neutral state.
Implementation Method 2
The first motor is in fluid connection with the first motor connection and is configured to drive a sickle knife gear box.
Implementation Method 3
The drive manifold includes a plurality of connections, e.g. a first pump connection, a first motor connection, a second motor connection, a combine connection and a manifold case drain connection.
Data Source
AI summary
A sickle knife drive for an agricultural vehicle generally includes a first pump, a first motor, a second motor and a drive manifold having a plurality of connections used for connecting to other devices of the sickle knife drive and/or to devices outside of the sickle knife drive. Operation of the first pump in a forward direction causes the first motor to drive a sickle knife gearbox to cut a crop. During the forward direction, the second motor provides cooling to the fluid circuit. When the first pump direction is reversed, the agricultural vehicle supplements a fluid flow to the fluid circuit to clear any jammed crop from the sickle knives.