Oscillating Linear Drive Mechanism With Dual Crankshaft Support
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Solution Overview
Problem
Existing double eccentric arc oscillating mechanisms face instability and interference issues when an external force acts on the reciprocating portion, leading to deformation of the cantilevered eccentric shaft and disruption of the oscillation fulcrum's operation.
Innovation Solution
A drive device is designed with a first and second crankshaft, where both ends of the first crankshaft are rotatably supported, and the second crankshaft is supported by the eccentric shaft, featuring journal portions that are eccentric in opposite directions, allowing for stable rotation and guiding of sliders for linear motion, preventing deformation and maintaining smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oscillation fulcrum is placed directly below the reciprocating portion to enable input/output shaft provision, then the structure becomes more compact and operational efficiency improves, but the cantilevered eccentric shaft deforms under external force and interferes with oscillation fulcrum operation
Solution Approach 1:
The drive device is divided into two separate crankshafts: a first crankshaft that rotates around a first central axis, and a second crankshaft that rotates around a second central axis. This segmentation allows each crankshaft to perform its function independently, preventing the deformation issues that occur in single cantilevered structures while maintaining compact design.
Solution Approach 2:
The eccentric shaft serves as an intermediary component that connects the first and second crankshafts. It transmits rotational motion from the first crankshaft to the second crankshaft, enabling the second crankshaft to generate the oscillating motion needed for the oscillation fulcrum to function properly without requiring the first crankshaft to be cantilevered.
2Ease of manufacture
If a cantilevered eccentric shaft structure is used to support the reciprocating portion, then the structure is simplified and easier to manufacture, but the shaft deforms under external force causing operational interference
Solution Approach 1:
The single cantilevered eccentric shaft is segmented into two separate crankshafts supported at both ends. The first crankshaft is supported by the case at both ends, and the second crankshaft is supported by the eccentric shaft at both ends, eliminating the cantilevered configuration that causes deformation under load.
Solution Approach 2:
Instead of having the eccentric shaft support the reciprocating portion in a cantilevered manner, the patent inverts the support structure by providing bilateral support for both crankshafts. The oscillation fulcrum is positioned to receive oscillating motion from the second crankshaft, reversing the traditional support arrangement to eliminate deformation.
3Productivity
If the reciprocating unit is positioned directly below the oscillation fulcrum to optimize power conversion, then operational efficiency increases, but the cantilevered structure becomes more prone to deformation and interference
Solution Approach 1:
The drive device segments the power transmission path into two crankshafts rotating at different axes, allowing the reciprocating unit to be positioned directly below the oscillation fulcrum for optimal power conversion while the bilateral support structure prevents deformation and maintains operational stability.
Solution Approach 2:
The patent introduces a second axis of rotation by adding the second crankshaft that rotates around a second central axis different from the first. This dimensional change allows the system to achieve both efficient power conversion with the reciprocating unit below the fulcrum and structural stability through bilateral support.
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 configuration ensures stable power conversion of rotational motion to linear motion with high operation efficiency and reduced vibration, even when the reciprocating unit is positioned directly below the oscillation fulcrum.
Implementation Method 1
a first crankshaft including a main shaft and an eccentric shaft, the main shaft having a first central axis, the eccentric shaft having a second central axis parallel to the first central axis and being eccentric to the main shaft
Implementation Method 2
a second crankshaft supported by the eccentric shaft so as to be rotatable around the second central axis, the second crankshaft including a first journal portion and a second journal portion, the first journal portion being eccentric to the second central axis in one direction, the second journal portion being eccentric to the second central axis in another direction
Data Source
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AI summary
The invention relates to a drive device (10) including an oscillating linear drive mechanism (20). The drive device (10) includes a case (12), a first crankshaft (CR1), a second crankshaft (CR2), a first slider (S1), a second slider (S2), a first moving unit (P1, CN1), a first guide (30), a second guide (32), and a third guide (14a).