Multi-motion leadscrew assembly with clutch sub-assembly
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Solution Overview
Problem
Conventional leadscrew systems lack the ability to selectively control the motion of the screw nut between linear and rotational motion based on the engagement state of the clutch sub-assembly, limiting their versatility in applications requiring both types of motion.
Innovation Solution
A multi-motion assembly comprising a screw nut with an inside thread matching the outside thread of a leadscrew and a clutch sub-assembly that can operate in engaged and disengaged states, allowing the screw nut to either move linearly or rotate with the leadscrew depending on the engagement state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional leadscrew system uses a fixed connection between the screw nut and the drive mechanism, then the system can only provide linear motion, but it lacks versatility for applications requiring both linear and rotational motion
Solution Approach 1:
The patent applies the dynamics principle by implementing a clutch sub-assembly that can dynamically switch between engaged and disengaged states. When engaged, the clutch prevents rotation of the screw nut relative to the leadscrew, enabling linear motion. When disengaged, the clutch allows the screw nut to rotate with the leadscrew, enabling rotational motion. This dynamic state changeability provides motion control versatility without requiring completely separate systems for linear and rotational motion.
Solution Approach 2:
The patent applies the universality principle by designing a single leadscrew system that can perform multiple functions: it can provide linear motion when the clutch is engaged, and rotational motion when the clutch is disengaged. The clutch sub-assembly acts as a control mechanism that enables the system to adapt its function based on operational requirements, making it suitable for applications like dissolution testing apparatuses that require both motion types.
2Adaptability or versatility
If the screw nut is rigidly connected to prevent rotation, then linear motion is achieved, but the system cannot provide rotational motion when needed
Solution Approach 1:
The clutch sub-assembly provides dynamic control by transitioning between engaged and disengaged states. In the engaged state, it rigidly connects the screw nut to the leadscrew, preventing rotation and enabling linear motion. In the disengaged state, it releases the connection, allowing the screw nut to rotate freely with the leadscrew. This dynamic switching mechanism provides both motion type selection and operational flexibility.
3Adaptability or versatility
If the clutch sub-assembly is added to enable selective motion control, then motion versatility is improved, but the device complexity increases
Solution Approach 1:
The clutch sub-assembly acts as an intermediary mechanism between the leadscrew and the screw nut. It mediates the motion transmission by selectively engaging or disengaging the connection, thereby controlling whether the screw nut moves linearly or rotates. This intermediary component enables selective motion control while maintaining a relatively simple overall structure, as it integrates into the existing leadscrew mechanism rather than requiring separate 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
Enables the leadscrew system to provide both linear and rotational motion based on the clutch sub-assembly's state, enhancing its applicability in devices like dissolution testing apparatuses by allowing precise control and versatility in motion types.
Implementation Method 1
A leadscrew is a screw, or threaded rod, that may be used, in conjunction with a corresponding nut, to convert rotational motion into linear motion
Implementation Method 2
The clutch sub-assembly is adapted to operate in any one of an engaged state and a disengaged state. In the engaged state, the clutch sub-assembly prevents the screw nut from rotating with the leadscrew
Data Source
AI summary
In one embodiment, a stirring system has a stirring assembly, a threaded leadscrew, and a multi-motion assembly adapted to travel along the leadscrew and accompanying parallel guide rods. The multi-motion assembly (i) has a timing pulley for powering the stirring assembly via a timing belt and (ii) converts the rotation of the leadscrew into either travel along the leadscrew in an engaged state or rotation of the timing pulley in a disengaged state. The multi-motion assembly includes (i) a screw-nut having an inside thread matching the leadscrew's thread and (ii) a clutch sub-assembly. The clutch sub-assembly (i) prevents the screw nut from rotating with the leadscrew in the engaged state, such that leadscrew rotation causes linear movement of the multi-motion assembly and (ii) allows the screw nut to rotate with the leadscrew in the disengaged state, such that leadscrew rotation causes corresponding rotation of the screw nut and timing pulley.