Understanding Gas Dynamics in Piston-Crank Slider System

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SUMMARY

This discussion focuses on the gas dynamics within a piston-crank slider system, particularly in the context of converting rotary motion from a motor into linear motion for an electric hospital bed. The closed cylinder design includes inlet and outlet ports to manage air induction and gas exhaust during the piston’s movement. Participants suggest exploring linear actuators as a simpler alternative to the crank slider mechanism for this application. The conversation highlights the importance of understanding gas behavior and mechanical design in achieving effective motion transfer.

PREREQUISITES
  • Understanding of piston-crank slider mechanisms
  • Knowledge of gas dynamics in mechanical systems
  • Familiarity with linear actuators and their applications
  • Basic principles of mechanical design and motion conversion
NEXT STEPS
  • Research "piston-crank slider dynamics" for in-depth mechanics
  • Explore "linear actuator design" and its advantages over crank sliders
  • Study "gas dynamics in closed systems" to understand pressure changes
  • Investigate "electric motor specifications" for optimal rotary motion conversion
USEFUL FOR

This discussion is beneficial for mechanical engineers, product designers, and anyone involved in designing motion systems for medical devices, particularly those working on electric hospital beds.

Eko
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TL;DR
crank slider mechanism.
I need help understanding what happens to the gas that is being worked by the piston, in the crank slider. My goal is to produce linear motion on an object up to a certain height and I'm wondering since the slider moves back during the rotation of the crank what happens to the object I'm trying to push and gas inside the piston. Most of the help online-only deals on force analysis of the crank and the slider. Any help or reference text on this topic would help. suppose end EG wasn't closed and there was an object there.
 

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Welcome to PF.
The closed end of the cylinder will have an inlet and an outlet port, so that more air can be inducted while the piston volume is increasing, and the compressed gas can escape during the exhaust cycle. The valves may be controlled by some form of crankshaft, or simply by pressure difference.

You need to better describe why you need the cylinder to lift an unidentified object with a slider-crank.
 
:smile:thank you for the reply, its kind of a simple project, an electric hospital bed so a motor to produce rotary motion and a crank slider to convert it to linear. I am new to the mechanics of machines stuff so crank slider was the only option i thought off, If you have a better one I am up to hear them.Thanks again.
 
Maybe consider a linear actuator in the form of an electric motor driven screw.
Search eBay or Amazon for "linear actuator".
 
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thanks that's much simple
 

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