Motor Grader Scarifier System Linkage Reduction
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Solution Overview
Problem
Current scarifier systems on motor graders are complex, leading to spacing issues with other assemblies, disrupting the operator's line of sight, and causing potential collisions and wear due to intricate linkage assemblies, which also complicate replacement and retrofitting.
Innovation Solution
A scarifier system with first and second pin members coupled to a plate element, featuring first and second arcuate drawbar arms that pivot about a pivot axis, and actuators directly coupled to these arms to rotate the carriage, minimizing linkage and optimizing spacing and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a complex linkage assembly is used to support and move the scarifier carriage, then the carriage can be moved from non-working to working position, but the system complexity increases and spacing issues with other assemblies occur
Solution Approach 1:
The patent removes the complex linkage assembly from the scarifier system. Instead of using multiple lift arms, rods, ball joints, and shafts, the invention directly couples the hydraulic cylinder to the drawbar arm at a single ball stud, extracting the unnecessary intermediate linkage components while maintaining the carriage movement capability.
Solution Approach 2:
The patent introduces a single ball stud as an intermediary coupling point between the hydraulic cylinder and the drawbar arm. This simple intermediary replaces the complex linkage assembly, providing the necessary connection while minimizing system complexity and avoiding interference with other components.
2Ease of operation
If a linkage assembly is used to move the scarifier carriage, then the carriage can be positioned correctly, but the line of sight of the operator is disrupted
Solution Approach 1:
The patent removes the linkage assembly components (lift arms, rods, shafts) that physically obstruct the operator's view. By eliminating these intermediate structures and using a direct hydraulic cylinder coupling, the line of sight from the operator cab to the ground is maintained without disruption.
3Ease of operation
If the scarifier system is mounted mid-frame with intricate linkage, then the carriage can be moved and positioned, but collisions with other assemblies and wear occur
Solution Approach 1:
The patent eliminates the linkage assembly that causes collisions with tires and other implements. By using a direct hydraulic cylinder coupling to the drawbar arm, the system achieves carriage movement without the intermediate components that interfere with other parts of the motor grader, thereby reducing wear and collision damage.
4Ease of operation
If a complex linkage assembly is used in the scarifier system, then the carriage can be moved, but replacement and retrofitting become impracticable
Solution Approach 1:
The patent removes the complex linkage assembly with multiple components (lift arms, rods, ball joints, shafts, mounting plates) that make replacement difficult. By simplifying to a direct hydraulic cylinder coupling at a single ball stud, the scarifier system becomes much easier to replace and retrofit on existing motor graders.
Solution Approach 2:
The patent segments the scarifier system into independent, easily replaceable components. The drawbar arm with its single ball stud coupling allows the hydraulic cylinder to be independently installed or replaced without affecting other parts of the system, facilitating easy maintenance and retrofitting.
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 reduces system complexity, prevents collisions with other assemblies, maintains clear operator visibility, and simplifies manufacturing and retrofitting by eliminating unnecessary linkage and support structures, thus reducing costs and improving design flexibility.
Implementation Method 1
An actuator is coupled to the first arcuate drawbar arm and the second pin member to rotate the carriage about a pivot axis of the first pin member.
Data Source
AI summary
A motor grader including a frame and a scarifier system coupled to the frame. The scarifier system includes a first pin member and second pin member both coupled to the frame and interconnected to one another. The scarifier system also includes a first and second arcuate drawbar arms in spaced relation and coupled to the first pin member and a carriage. An actuator is coupled to the first arcuate drawbar arm and the second pin member to rotate the carriage about a pivot axis of the first pin member.