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A slider-crank mechanism is a typical design which converts rotary motion into linear motion. It is achieved by connecting a slider and a crank with a rod. Figure A depicts a mechanism utilized as a system that converts the reciprocating linear motion of an automobile engine into rotary motion.
The second figure, B, is an example of the mechanism that has the same functions as the slider-crank in the first figure A in addition to the sliding stroke adjustment feature for the slider. To add this feature, the sliding stroke adjusting screw is placed on top of the rotation shaft center of the rotation disk. The sliding stroke can be adjusted by the adjusting nut located on one end of the sliding stroke adjusting screw.
A and B. The two mechanisms above are examples of slider-crank mechanisms.
In addition, if high-speed rotation or operation for long hours is required, it is necessary to consider design items related to the reliability matters described here.
- Rotation balance of rotating body (the entire structures on the disk)
- Strength of rotating shaft
- Prevention of adjusting nut-loosening (e.g., double-nut system)
- Selection of wear-resistant parts for the area subject to wear
Figure C below illustrates the mechanism with exchangeable rod/slider parts. A U-shaped hook is installed so that the tip of the rod can be easily connected to the hinge pin at the hinged end of the crank.
C. Example of a slider-crank mechanism with exchangeable rod/slider parts.
Application Examples
For simple automation devices or fixtures made compatible with multiple models by connecting a processing unit to the slider unit, exchanging the...