Patent ID: 8202058

Claim:
A variable displacement axial piston machine ( 1 ) comprising: a cylinder block ( 4 ), at least one main cylinder ( 5 ), at least one main piston ( 6 ), a swash plate ( 11 ), at least one plunger ( 12 ), at least one auxiliary cylinder ( 13 ), and a sensor, where the main piston ( 6 ) is movable in the main cylinder ( 5 ) upon relative movement between the swash plate ( 11 ) and the main cylinder ( 5 ), where a stroke of the main piston ( 6 ) depends on a degree of tilting of the swash plate ( 11 ) relative to the main cylinder ( 5 ), and where the plunger ( 12 ) can tilt the swash plate ( 11 ) relative to the main cylinder ( 5 ) and thereby control the stroke of the main piston ( 6 ) in the main cylinder ( 5 ), wherein the sensor comprises an antenna ( 17 ) which is fixed in the auxiliary cylinder ( 13 ) and is received within a bore ( 18 ) provided in the plunger ( 12 ) such that the antenna ( 17 ) senses movement of the plunger ( 12 ) based on change of impedance by induction in the plunger ( 12 ) and determines an angle of the swash plate ( 11 ) based upon a functional dependency between the plunger ( 12 ) and the antenna ( 17 ) disposed linearly therein.