Crank Driving Apparatus Eccentric Distance Adjustment
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Solution Overview
Problem
Existing crank driving apparatuses are limited in adjusting the eccentric distance, allowing only two options, making it difficult to determine and set the intended eccentric distance, which restricts their usage and requires cumbersome manual measurement and positioning.
Innovation Solution
The apparatus includes three or more first eccentric-distance index portions on one supporting member and a second eccentric-distance index portion on the other supporting member, allowing easy and accurate positioning to fix the eccentric distance at predetermined values, facilitating the determination of the eccentric distance from among multiple options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only two stopper portions are provided to determine eccentric distance, then the structure is simple, but the adjustment range and versatility are significantly restricted
Solution Approach 1:
The single stopper portion is segmented into multiple stopper portions (first stopper portion and second stopper portion) positioned at different locations. Each stopper portion corresponds to a different eccentric distance setting, enabling multi-position adjustment without requiring a complex continuous adjustment mechanism.
Solution Approach 2:
The solution transitions from a one-dimensional continuous adjustment problem to a multi-point discrete adjustment by adding the radial dimension. The stopper portions are arranged at different radial positions, allowing the holder to be positioned at multiple predetermined eccentric distances by selecting which stopper portion contacts the crank hub.
2Ease of operation
If manual measurement and positioning are used to determine eccentric distance, then no additional components are needed, but the operation is cumbersome and time-consuming
Solution Approach 1:
The stopper portions are pre-positioned at specific locations that correspond to predetermined eccentric distances. This preliminary positioning eliminates the need for operators to perform measurements and calculations during operation. The operator simply needs to select the desired stopper portion, and the corresponding eccentric distance is automatically determined.
Solution Approach 2:
The system provides self-positioning functionality through the stopper portions. When the holder is moved radially, the stopper portions automatically contact the crank hub at predetermined positions, self-determining the eccentric distance without requiring external measurement tools or operator intervention for positioning accuracy.
3Adaptability or versatility
If the holder can be positioned at intermediate positions between stopper portions, then more eccentric distance options are available, but positioning accuracy and determination become difficult
Solution Approach 1:
Multiple stopper portions are created as copies of the same functional element but positioned at different locations. Each stopper portion copy provides a predetermined eccentric distance option. This approach discretizes the continuous position space into distinct, easily identifiable positions, maintaining positioning precision while providing multiple options.
Data Source
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AI summary
A crank driving apparatus (20) includes a first supporting member (22), a second supporting member (24) including an eccentric shaft (24a), and a coupling member (26) rotatably supported by the second supporting member (24) via the eccentric shaft (24a) and coupled to an object that is to be driven. The second supporting member (24) is disposed in such a manner that an attachment position of the second supporting member (24) relative to the first supporting member (22) is adjustable in an eccentric direction which determines an eccentric distance of the axis of the eccentric shaft (24a) from the axis of a driving shaft (34).