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1
Stirling Engine with Rhombic Drive  (highspeed)
Stirling Engine with Rhombic Drive (highspeed)
::2014/04/18::
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2
#3 Stirling 2 - Rhombic Model
#3 Stirling 2 - Rhombic Model
::2009/02/10::
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3
Stirling Engine with Rhombic Drive Part 1
Stirling Engine with Rhombic Drive Part 1
::2008/09/05::
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4
Rhombic animation
Rhombic animation
::2010/08/14::
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5
Ross 11cc beta rhombic drive hot air engine
Ross 11cc beta rhombic drive hot air engine
::2013/08/01::
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6
RHOMBIC DRIVE STIRLING CYCLE ENGINE PART TWO
RHOMBIC DRIVE STIRLING CYCLE ENGINE PART TWO
::2008/09/07::
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7
Rhombic Drive Stirling Engine Part 3
Rhombic Drive Stirling Engine Part 3
::2008/09/13::
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8
Stirling Engine with Rhombic Drive details
Stirling Engine with Rhombic Drive details
::2014/03/05::
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9
Rhombic drive Stirling engine - moteur Stirling à embiellage rhombique
Rhombic drive Stirling engine - moteur Stirling à embiellage rhombique
::2010/04/24::
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10
Stirling engine with rhombic drive
Stirling engine with rhombic drive
::2014/02/24::
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11
Pallarpad
Pallarpad's concept vs Rhombic drive
::2014/05/30::
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12
Rhombic Drive Stirling Engine Part 4
Rhombic Drive Stirling Engine Part 4
::2008/10/27::
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13
Rhombic Drive Stirling Engine, 10cc Pressurized, Part 1
Rhombic Drive Stirling Engine, 10cc Pressurized, Part 1
::2009/12/03::
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14
Stirling Engine with Rhombic Drive
Stirling Engine with Rhombic Drive
::2014/04/18::
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15
Rhombic drive VS. My 105° "L" yoke
Rhombic drive VS. My 105° "L" yoke
::2014/04/11::
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16
Rhombic Drive Stirling Engine,    10cc Pressurized,  Part 2
Rhombic Drive Stirling Engine, 10cc Pressurized, Part 2
::2009/12/05::
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17
Rhombic Drive Stirling Engine by William Kidd
Rhombic Drive Stirling Engine by William Kidd
::2013/03/09::
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18
RHOMBIC DRIVE STIRLING ENGINE, PART FIVE
RHOMBIC DRIVE STIRLING ENGINE, PART FIVE
::2008/11/08::
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19
beta rhombic drive twin crank pressurised hot air engine
beta rhombic drive twin crank pressurised hot air engine
::2013/08/06::
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20
Stirling Engine with Rhombic Drive
Stirling Engine with Rhombic Drive
::2013/11/09::
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21
Rhombic drive simulation
Rhombic drive simulation
::2007/10/13::
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22
Animated Beta Type Stirling, Rhombic Drive (CatiaV5)
Animated Beta Type Stirling, Rhombic Drive (CatiaV5)
::2013/06/16::
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23
Stirling Beta - Rhombic drive
Stirling Beta - Rhombic drive
::2010/04/21::
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24
beta stirling engine simulation with rhombic drive
beta stirling engine simulation with rhombic drive
::2012/01/11::
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25
Asymmetric Rhombic Drive Stirling Engine [PEACE Lab. NCKU]
Asymmetric Rhombic Drive Stirling Engine [PEACE Lab. NCKU]
::2008/10/21::
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26
Stirling engine (rhombic drive Beta configuration)
Stirling engine (rhombic drive Beta configuration)
::2012/06/03::
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27
Rhombic Drive for Speed Governor
Rhombic Drive for Speed Governor
::2009/07/13::
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28
Rhombic Drive for Stirling Engine
Rhombic Drive for Stirling Engine
::2009/07/13::
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29
Solar Stirling Engine
Solar Stirling Engine
::2012/10/25::
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30
Demonstration of a wood burning Stirling engine.
Demonstration of a wood burning Stirling engine.
::2013/09/19::
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31
Stirling engine with ball joint piston - invention
Stirling engine with ball joint piston - invention
::2009/10/01::
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32
NCKU PEACE LAB Stirling Engine
NCKU PEACE LAB Stirling Engine
::2008/10/07::
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33
Silnik Stirlinga typu rhombic - prezentacja
Silnik Stirlinga typu rhombic - prezentacja
::2014/04/20::
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34
Tutorial-Gear Change (Rhombic Dodecahedron Gear Cube)
Tutorial-Gear Change (Rhombic Dodecahedron Gear Cube)
::2013/06/15::
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35
Silnik Stirlinga beta typu rhombic
Silnik Stirlinga beta typu rhombic
::2013/12/31::
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36
Julius De Waal Rhombic Stirling engine
Julius De Waal Rhombic Stirling engine
::2013/04/22::
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37
Cool Alignment Within a Rhombic Dodecahedron
Cool Alignment Within a Rhombic Dodecahedron
::2008/04/17::
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38
Rhombic engine
Rhombic engine
::2012/05/12::
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39
flame eating rhombic (or stirling?) engine
flame eating rhombic (or stirling?) engine
::2013/03/24::
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40
Rhombic Beta Stirling v2 (in design)
Rhombic Beta Stirling v2 (in design)
::2008/11/26::
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41
Moteur Stirling Rhombic
Moteur Stirling Rhombic
::2012/10/21::
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42
2 Watt Rhombic Cycle Stirling Engine
2 Watt Rhombic Cycle Stirling Engine
::2008/06/11::
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43
Torsional spikes on rhombic triacontahedron
Torsional spikes on rhombic triacontahedron
::2012/09/26::
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44
Dissection of a Concave Rhombic Triacontahedron
Dissection of a Concave Rhombic Triacontahedron
::2009/07/07::
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45
Flexible Rhombic Dodecahedron
Flexible Rhombic Dodecahedron
::2007/01/19::
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46
Rhombic Dodecahedron
Rhombic Dodecahedron
::2009/08/24::
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47
$1.69 4 Pcs Car Tire Valves Rhombic Pattern Round Caps Red-12002579
$1.69 4 Pcs Car Tire Valves Rhombic Pattern Round Caps Red-12002579
::2012/03/19::
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48
Rhombic Surfaces
Rhombic Surfaces
::2007/05/09::
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49
Complex Rhombic Hexecontahedron of Dodecahedrons
Complex Rhombic Hexecontahedron of Dodecahedrons
::2010/01/25::
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50
Packing of Rhombic Dodecahedra Expanding and Contracting in Two Directions
Packing of Rhombic Dodecahedra Expanding and Contracting in Two Directions
::2013/12/10::
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Cut away diagram of a Rhombic Drive Beta Stirling Engine Design
Pink - Hot cylinder wall, Dark grey - Cold cylinder wall (with coolant inlet and outlet pipes in Yellow), Dark Green - Thermal insulation separating the two cylinder ends, Light Green - Displacer piston, Dark Blue - Power piston, Light Blue - Flywheels,
Not Shown: external heat-source, and external heat-sinks. In this design the Displacer piston is used without a regenerator.

The rhombic drive is a specific method of transferring mechanical energy, or work, used when a single cylinder is used for two separately oscillating pistons.

History[edit]

It was originally developed around 1900 for the twin-cylinder Lanchester car engine where it allowed perfect balancing of the inertial forces on both pistons.  A current example of its use is on beta type-Stirling engines; the drive's complexity and tight tolerances, causing a high cost of manufacture, is a hurdle for the widespread usage of this drive.

Operation[edit]

Schematic of a rhombic drive stirling engine in operation.

In its simplest form, the drive utilizes a jointed rhomboid to convert linear work from a reciprocating piston to rotational work.   The connecting rod of the piston is rigid as opposed to a common reciprocating engine which directly connects the piston to the crankshaft with a flexible joint in the piston. Instead, the rod connects to one corner of a rhombus.   When force is applied to the piston, it pushes down; at the same time, the outer corners of the rhomboid push out. They push on two cranks/flywheels which cause them to rotate, each in opposite directions. As the wheels rotate the rhombus progresses its change of shape from being flattened in the direction of the piston axis at top dead centre to being flattened in the perpendicular direction to the piston axis at bottom dead centre.

In the pictured example the left crank/flywheel turns clockwise and the right crank/flywheel anticlockwise. They turn at the same angular velocity and this can be reinforced by intermeshing them as gear wheels.

References[edit]

See also[edit]


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