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.
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 wide-spread usage of this drive.
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 normal 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.
Another example of this type of rhomboid mechanism is in some types of car jack