Torsion Axle Lockout Assembly for Operator Control
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Solution Overview
Problem
Compact construction machines with rigid undercarriage mounting transfer machine-induced loads and vibrations to operators, limiting fine control during operations due to the absorption of these forces by torsion axle assemblies.
Innovation Solution
A suspension system with a torsion axle assembly that includes a shaft and arm, where a tube supports the shaft for rotation relative to the frame, and a lockout assembly with a coupling mechanism to selectively fix the shaft against rotation, incorporating elastomeric members to resist movement and generate a return force, and an actuating assembly to control the lockout mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a torsion axle assembly is used to absorb loads and vibrations, then operator comfort is improved, but operator control and feel of work surface contours deteriorates
Solution Approach 1:
The suspension system allows dynamic operation during travel to absorb vibrations, then provides a locked state during work operations to provide rigid connection for operator control. The system transitions between flexible and rigid states based on operational requirements.
Solution Approach 2:
The system changes the rigidity parameter of the connection between undercarriage and frame by engaging or disengaging the lockout assembly. When locked, the connection becomes rigid for precision control; when unlocked, it becomes flexible for vibration absorption.
2Ease of operation
If a rigid mounting between frame and undercarriages is used, then operator control and feel of work surface is improved, but operator comfort deteriorates due to transferred vibrations
Solution Approach 1:
The system dynamically switches between rigid and flexible mounting states. During work operations, the lockout assembly engages to provide rigid mounting for control precision. During travel, the lockout disengages to allow flexible mounting that absorbs vibrations.
Solution Approach 2:
The rigidity parameter of the frame-undercarriage connection is changed by engaging or disengaging the lockout mechanism. This allows the system to adapt between rigid (for control) and flexible (for comfort) states as needed.
3Ease of operation
If a lockout assembly is added to the torsion axle assembly, then operator control is improved, but device complexity increases
Solution Approach 1:
The lockout assembly integrates multiple functions: it provides mechanical locking to prevent shaft rotation, incorporates elastomeric members for vibration isolation, and includes an actuating mechanism for engagement/disengagement. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The lockout assembly merges the locking mechanism, vibration isolation elements (elastomeric members), and actuating system into a single integrated unit that attaches to the existing torsion axle assembly, minimizing additional complexity.
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
Enhances operator control by allowing selective locking of the torsion axle assembly, providing better feel and control of the machine's movement and work surface contours, while maintaining vibration absorption capabilities.
Implementation Method 1
At least one elastomeric member is contained within the tube that is configured and arranged so as to resist movement of the shaft relative to the tube and to generate and apply a return force on a direction opposite the direction of rotational movement of the shaft relative to the tube
Implementation Method 2
The individual torsion arms may rotate against a cushion of rubber cords located within the torsion shaft. This cushioned rotation absorbs some of the loads and vibrations induced on the undercarriages of the machine during operation
Implementation Method 3
The individual torsion arms may rotate against a cushion of rubber cords located within the torsion shaft. This cushioned rotation absorbs some of the loads and vibrations induced on the undercarriages of the machine during operation
Data Source
AI summary
A suspension system for supporting a ground engaging member relative to a frame is provided. The suspension system includes a torsion axle assembly including an arm, an axle coupled to the ground engaging member and connected to the arm, a shaft connected to the arm and a tube that is connected to the frame. The tube is configured such that at least a portion of the shaft is received in the tube and supported by the tube for rotation relative to the tube and the frame. A lockout assembly includes a coupling mechanism that is selectively operable to fix the shaft against rotational movement with respect to the tube.