What Type of Mechanism Converts Up and Down Movement into Rotational Movement?

  • Thread starter Thread starter Chantry09
  • Start date Start date
  • Tags Tags
    Mechanism
Click For Summary

Discussion Overview

The discussion revolves around the mechanisms that convert up and down movement into rotational movement, specifically in the context of a Stirling engine. Participants explore various mechanical designs and their functionalities, focusing on the conversion process and the specific components involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants note that the reciprocating motion is the powered motion, while the rotational movement is the output.
  • One participant identifies the mechanism as a crank-slider mechanism but questions whether this is the correct interpretation for the specific motion described.
  • Another participant suggests that a swash plate mechanism may be in use, describing how it operates by pushing pistons without a conventional crankshaft setup.
  • A participant proposes the idea of using a circular cam with a wave cut into its circumference, questioning its viability as an alternative to using springs for piston retraction.
  • There is a mention of a simple barrel cam as a potential mechanism for the conversion process.

Areas of Agreement / Disagreement

Participants express differing views on the specific mechanisms involved, with no consensus on which mechanism is definitively correct. Multiple competing models and ideas are presented, indicating an unresolved discussion.

Contextual Notes

Participants rely on visual observations of the mechanism, which may limit their understanding of the underlying mechanics. The discussion includes assumptions about the motion axes and the nature of the mechanisms without definitive conclusions.

Chantry09
Messages
59
Reaction score
0
Hi,

I was just wondering what kind of mechanism is used in this video

It converts the up and down movement into rotational movement, and it all seems very compact and smooth.

James
 
Engineering news on Phys.org
Its worth noting that the reciprocating motion is the powered motion and the rotational movement is the output
 
It says, its a Stirling engine, just a multi cylindered version.
The acutal moving parts are simply a crank-slider mechanism.

I'm assuming this wasn't what you wanted from an answer, could you clarify exactly what it is you wanted to know please?
 
Last edited:
Hi, i know what engine it is, I am after the mechanism that converts the reciprocating motion into the rotational movement of the flywheel at the top.

I don't think a crank and slider mechanism is what is used, since the reciprocation motion is on the y axis, and the rotation movement is pivoting on the y axis, not the x axis.
 
Too bad you can't see the mechanism. Looks to me like a swash plate that's pushing the pistons, not the other way around.

Basically, it has a rotating plate that's set off at an angle from the central axis. As it goes around, the pistons get pushed in and then come back out as the sloped plate surface goes past each piston. There's nothing to pull the piston back out like a conventional crankshaft machine, so the pistons are generally spring loaded.
 
Last edited by a moderator:
Ah I see, that's quite interesting actually. Do you think a circular cam with a wave cut into its circumference and then attached to the cylinders via rollers would also be viable? It would mean I wouldn't have to use springs to push the pistons back down.
 
Spadez said:
Ah I see, that's quite interesting actually. Do you think a circular cam with a wave cut into its circumference and then attached to the cylinders via rollers would also be viable? It would mean I wouldn't have to use springs to push the pistons back down.
I don't see any reason that wouldn't work.
Just for reference to the other website you have the question at:
http://www.eng-tips.com/viewthread.cfm?qid=263186&page=1
 
Last edited by a moderator:
Isn't this just a simple barrel cam (cylindrical cam)?
 

Similar threads

Crazy idea for battle bot. Can it work?
  • · Replies 3 ·
Replies
3
Views
2K
Laboratory Rocker - type of mechanical movement & related information
  • · Replies 5 ·
Replies
5
Views
2K
Scotch yoke mechanism movement equation
  • · Replies 2 ·
Replies
2
Views
5K
Soft/Stable Movement for Parallelogram Mount with Wheel + Printhead
  • · Replies 1 ·
Replies
1
Views
840
Designing a spiral with a certain angle relative to movement direction
  • · Replies 5 ·
Replies
5
Views
2K
How to translate force into upward hinging motion between two panels?
  • · Replies 4 ·
Replies
4
Views
2K
Translating reciprocating motion into a 45 degree rotation
  • · Replies 5 ·
Replies
5
Views
3K
[Cam Design] - Force and torque curves
  • · Replies 18 ·
Replies
18
Views
2K
Up and down movement of a monitor
  • · Replies 2 ·
Replies
2
Views
1K
Mechanism for height adjustment of rotating body
  • · Replies 9 ·
Replies
9
Views
4K