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The low-temperature Stirling motor demonstrates how a
Stirling motor operates as well as the principles of its
design.
1. Description, technical data
The low-temperature Stirling motor is set in motion even
by the heat of the human hand. It only requires a tem-
perature difference of 5°C between the ground and the
top plate. The main cylinder is made of precision glass.
The displacer cylinder and the flywheel are transparent
acrylic so that the motion of the main piston, the dis-
placer piston and the crank drive can all be seen clearly.
The crankshaft and connecting rods have miniature pre-
cision bearings to minimise friction. Due to the matt black
coating of the top plate, the Stirling motor can also be
operated using solar power.
80 rpm approx. at ∆T 10ºC
Speed:
Flywheel:
110 mm Ø
Dimensions:
138 mm x 110 mm Ø
2. Assembly instructions
2.1 Finishing
• All components with burred edges should have their
burrs filed off using a flat or triangular file.
• File down the surfaces on any workpieces if desired.
2.2. Assembly
2.2.1. Making a permanent assembly
• We recommend use of "UHU plus endfest 300", "UHU
plus schnellfest" or similar 2-component epoxy resin
adhesive. In order to prevent damage to the coating
of the top plate, avoid any contact with solvents.
Owing to the differing expansion coefficients of the
materials, do not allow any of the components to
increase temperature during the hardening of the
adhesive. Aluminium will contract much more on
cooling than the glass cylinder, thus creating tension
in the glass leading to a decrease in the internal di-
ameter of the main cylinder or possibly even causing
it to break. Glueing together to make the connections
should generally be performed at a consistent tem-
perature of approximately 20°C.
1. Glue the main cylinder
temperature, then glue it to the
2. Fasten the bearings
bu
Force the ball race
bu
apply a thin adhesive film to three points on its outer
surface. Then push the ball race
two recesses of the bearing socket
adhesive should be removed with a cloth soaked in
white spirit. Always wipe towards the outside when
to the bracket
at room
9
bl
top plate.
1
inside the bearing socket
br
onto the crankshaft
cl
and
into one of the
bu
. Any surplus
br
doing this to prevent adhesive penetrating into the
bearings. From the other side push another ball race
onto the crankshaft
bu
achieve best alignment of the two ball races
the crankshaft
adhesive has hardened.
3. Glue the insert
Make sure that both surfaces being adhered are flush
together. There is a marking on the outer surface of
the insert
bp
. Align this marking along the transverse
bore of the crank disc
4. Next, glue the crank shaft journal
the insert
bp
5. Glue cylinder rods
rod
and the main piston
6
whatever may remain on the running surfaces of the
cylinder rods
relevant bores till about 2 mm protrudes and apply a
small amount of adhesive to the protruding end. Then
push the cylinder rod
remove any surplus adhesive as above. Make sure
the cylinder rod
that it is slightly recessed so that it does not damage
the running surface of the main cylinder
6. When glueing the displacer socket
of the displacer
displacer rod
then push the main piston
. Next, attach the displacer socket
9
placer rod
6
and position the complete module on the under-
4
side of the displacer
touches the top plate
in this position until the adhesive has fully hardened
to ensure that the displacer
remain parallel.
7. Finally glue the bearing socket
the bracket
bl
2.2.2. Making a temporary assembly
1. Press the ball race
rods
and
bm
out lubricant. To ensure that the bearings
smoothly always use the supplied, semi-spherical
washers
cr
in the assembly. The spherical side of the
washers
should face the ball bearing
cr
2. Push the first washer
, the second washer
bn
onto the crankshaft journal
bo
.
ing on the edge of the crank face
right of the crankshaft journal
diagram.
3. Push the first wide clamping disc
necting rod
bn
onto the cylinder rod
cs
having lubricated it slightly first. The diameter of the
6
and proceed as before. To
cl
cl
in the same position until the
into its recess in the crank disc
bp
.
bq
into the bore of
cm
.
into the bore of the displacer
cn
. No adhesive residue
7
. Push the cylinder rods into the
cn
into its correct position and
cn
cn
of the main piston
7
into the bore
5
proceed as follows. Push the
4
into the main piston's socket
6
7
into the main cylinder
5
. Glue this into the bore of the displacer
so that the displacer
4
1
. Leave these components
and top plate
4
into the bore of
br
.
into the bore of the connecting
bu
. All the bearings are supplied with-
bn
, the long connecting rod
cr
and the face of the crank
cr
.The small mark-
cm
should be to the
bo
cm
as seen in the
, the long con-
cs
and the second wide clamping disc
of the main piston
cn
leave
bu
.
bq
is glued so
later on.
9
8
to the dis-
just
4
1
run
bu
.
bu
,
7
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