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Engine valve with permanent magnet

How to simulate the workings of an engine valve
Author: Bernard Le Gall, Landerneau, France
Online since: 02/07/2009, Number of visits: 83285
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It is often mentioned that the valve of an internal combustion engine could also be controlled with electromagnets. So I asked myself: Why, then, not use permanent magnets?
Even though my approach doesn’t solve the problem, my two methods might still make some readers want to verify the results for themselves.
Those who try it will certainly come up with other, similar attempts at a solution very quickly. It is entertaining and may even lead to useful applications.


Classic concept:

  • The cam (1) rotates clockwise.
  • The valve lifter moves up and down.
  • The stroke of the cam (C) depends on how much the cam is tilting.

Magnetic concept:

It is unbelievable how fast the "magnet valve" moves up and down, depending on whether it is being attracted or repelled.
Here you can see the concept one more time: The ring magnet (1) sits on the shaft that is operated with a crank (4). If the poles of the ring magnet and the "valve magnet" are different, the "valve magnet" is being attracted; if the polarity is the same, it is lifted. It looks as if the magnet temporarily floats.

Initial approach

I realised this concept with simple means. The ring magnet was placed on the aluminium shaft and secured. The shaft was pushed through the holes in the base (grey). The pawn-shaped magnet moves up and down inside a syringe barrel.
Caution: The two magnets should never be allowed to collide directly, or else they will quickly break. That’s why I closed the bottom of the barrel with acrylic glass.
Here, the pawn magnet is attracted...
Here, the pawn magnet is attracted...
...and repelled after another half turn.
...and repelled after another half turn.

Second approach

In a second attempt, I replaced the ring magnet with two diametrically magnetised disc magnets type S-10-05-DN.
These were glued to two plywood blocks.
The idea: The magnets (3) in the disc (2) rotate on a base (1). After half a turn, the magnets (3) attract the diametrically magnetised magnets (4), at which point the two "jaws" close. As soon as the disc is turned further, the jaws separate again under their own weight. Braces on the outside of the jaws prevent them from splitting too far apart. Otherwise, they would no longer be attracted to the magnets on the disc.
Here too, the disc is rotated by hand via a shaft
Here too, the disc is rotated by hand via a shaft
The magnets on the edge are attracted - the jaws close
The magnets on the edge are attracted - the jaws close
The jaws tilt apart because the magnets on the disc are rotated away
The jaws tilt apart because the magnets on the disc are rotated away
I hope that the readers of this experiment will come up with their own applications - be it purely playful or practical.
I wish you every success with the "machines of the future"!

Articles used

Load...
S-06-25-N Rod magnet Ø 6,35 mm, height 25,4 mm, holds approx. 1,7 kg, neodymium, N42, nickel-plated
S-06-25-N
Rod magnet Ø 6,35 mm, height 25,4 mm, holds approx. 1,7 kg, neodymium, N42, nickel-plated
S-06-25-N Rod magnet Ø 6,35 mm, height 25,4 mm, holds approx. 1,7 kg, neodymium, N42, nickel-plated
5 pcs. 1,79 EUR ea.*
from 15 pcs. 1,57 EUR ea.*
from 40 pcs. 1,40 EUR ea.*
from 80 pcs. 1,31 EUR ea.*
Ask for a rebate from 450 pcs.
Available: 58 200 pcs.
S-10-05-DN Disc magnet Ø 10 mm, height 5 mm, holds approx. 1 kg, neodymium, N45, nickel-plated, diametrically magnetised
S-10-05-DN
Disc magnet Ø 10 mm, height 5 mm, holds approx. 1 kg, neodymium, N45, nickel-plated, diametrically magnetised
S-10-05-DN Disc magnet Ø 10 mm, height 5 mm, holds approx. 1 kg, neodymium, N45, nickel-plated, diametrically magnetised
5 pcs. 1,13 EUR ea.*
from 15 pcs. 0,99 EUR ea.*
from 40 pcs. 0,89 EUR ea.*
from 80 pcs. 0,83 EUR ea.*
Ask for a rebate from 600 pcs.
Available: 8 870 pcs.
Bestseller icon Magnetic pins 'Player' max. load on the wall 320 g, bulletin board magnets in the shape of a pawn in a game, Ø 12,5 mm, set of 10, in different colours
Magnetic pins 'Player'
max. load on the wall 320 g, bulletin board magnets in the shape of a pawn in a game, Ø 12,5 mm, set of 10, in different colours
These strong and colourful magnetic pins belong in every office!
Bestseller icon Magnetic pins 'Player' max. load on the wall 320 g, bulletin board magnets in the shape of a pawn in a game, Ø 12,5 mm, set of 10, in different colours
1 set 14,03 EUR/set*
from 3 sets 12,12 EUR/set*
from 10 sets 10,41 EUR/set*
from 30 sets 9,58 EUR/set*
Ask for a rebate from 100 sets
Select type and order
R-10-07-03-DN Ring magnet Ø 10/7 mm, height 3 mm, holds approx. 400 g, neodymium, N45, nickel-plated, diametrically magnetised
R-10-07-03-DN
Ring magnet Ø 10/7 mm, height 3 mm, holds approx. 400 g, neodymium, N45, nickel-plated, diametrically magnetised
R-10-07-03-DN Ring magnet Ø 10/7 mm, height 3 mm, holds approx. 400 g, neodymium, N45, nickel-plated, diametrically magnetised
5 pcs. 0,89 EUR ea.*
from 15 pcs. 0,78 EUR ea.*
from 40 pcs. 0,69 EUR ea.*
from 80 pcs. 0,64 EUR ea.*
Ask for a rebate from 650 pcs.
Available: 15 715 pcs.
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