Surface Compactor Amplitude Adjustment With Torque-Limited Shafts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing surface compaction machines require manual adjustment of vibration amplitude, which is inefficient and not suitable for dynamic operation.
Innovation Solution
An adjustment mechanism for a vibratory mechanism in surface compaction machines, utilizing a screw, nut, and torque limiter to allow for dynamic adjustment of eccentric shafts, enabling precise control of vibration amplitude during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual adjustment of vibration amplitude is used, then the structure is simple, but the productivity and operational efficiency deteriorate due to inability to adjust during operation
Solution Approach 1:
The adjustment mechanism transforms the static manual adjustment system into a dynamic automated system. The screw-nut assembly enables the eccentric shaft to rotate relative to the housing during operation, allowing real-time amplitude adjustment. This dynamic capability resolves the contradiction by enabling continuous operation with adjustable parameters without requiring machine shutdown.
Solution Approach 2:
The patent replaces the purely mechanical manual adjustment system with a hybrid system incorporating a motor-driven actuator. The actuator applies torque to rotate the eccentric shaft, substituting human manual operation with automated mechanical actuation. This substitution improves productivity while maintaining acceptable mechanical complexity through the use of standard actuator components.
2Adaptability or versatility
If the eccentric shaft is allowed to rotate freely for amplitude adjustment, then the adaptability improves, but the reliability deteriorates due to unintentional rotation in vibrating environments
Solution Approach 1:
The torque limiter is pre-configured with a specific torque threshold that prevents unintentional rotation of the eccentric shaft during normal vibrating operation. This preliminary anti-action counteracts the harmful vibrations and forces that would otherwise cause unwanted shaft movement. When intentional adjustment is needed, the actuator applies sufficient torque to overcome this pre-set threshold, allowing controlled rotation while maintaining stability during normal operation.
Solution Approach 2:
The torque limiter acts as an intermediary between the eccentric shaft and the adjustment mechanism. It mediates between the need for shaft stability during operation and the need for rotational freedom during adjustment. The torque limiter allows rotation only when the applied torque exceeds the threshold, providing a controlled interface that simultaneously achieves both position stability and adjustment capability.
3Manufacturing precision
If traditional friction-based locking is used, then the device complexity is low, but the manufacturing precision deteriorates due to wear and play in vibrating environments
Solution Approach 1:
The patent replaces traditional friction-based locking mechanisms with a torque-based locking system using a torque limiter and actuator. Instead of relying on friction surfaces that wear and develop play, the system uses controlled torque application to achieve and maintain precise shaft positioning. This substitution eliminates wear-related precision degradation while maintaining relatively simple mechanical architecture through the use of standard torque limiter 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
Enables dynamic adjustment of vibration amplitude, preventing unintentional shaft rotation, reducing wear, and enhancing operational precision while allowing for secure locking in vibrating environments.
Implementation Method 1
a screw coupled to a first eccentric shaft that is rotatable about an axis of rotation. The adjustment mechanism further includes a nut coupled to a second eccentric shaft that is rotatable about the axis of rotation, wherein the screw is disposed within the nut
Implementation Method 2
The torque limiter prevents relative rotation between the first eccentric shaft and the second eccentric shaft and a phase adjustment between the first eccentric shaft and the second eccentric shaft when a net torque applied to the torque limiter is less than a locking torque threshold
Implementation Method 3
an actuator subassembly coupled to the screw to selectively apply a first linear force to the screw in a linear direction parallel to the axis of rotation to cause the screw to apply a first torque to the first eccentric shaft
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An adjustment mechanism for a vibratory mechanism of a surface compaction machine, the adjustment mechanism includes a torque limiter coupled between the first eccentric shaft and the second eccentric shaft that prevents relative rotation between the shafts and a phase adjustment between the shafts when a net torque applied to the torque limiter is less than a locking torque threshold. Application of a net torque to the torque limiter that is greater than or equal to the locking torque threshold causes the first eccentric shaft to rotate with respect to the second eccentric shaft. An actuator subassembly selectively applies a linear force cause a first torque to be applied the first eccentric shaft sufficient to apply a net torque to the torque limiter that is greater than or equal to the locking torque threshold to cause the first eccentric shaft to rotate with respect to the second eccentric shaft.