Two-lobe cam 1 has symmetrical contour a made up of circular arcs and rotates about fixed axis A. Rollers 2, connected by turning pairs B, C, D and E to pistons 3, roll around contour a of cam 1, reciprocating the pistons in symmetrically arranged cylinders 4. Positive motion is achieved by links 5 which are connected together and to rollers 2 by turning pairs B, C, D and E. The lengths of the links comply with the condition: B͞C=C͞D=D͞E=E͞B. The axes of the cylinders make angles of 90° with one another.
$3265$CmL,PM$