Vacuum motor (1), which has a working piston (12), an inner chamber in which the working piston (12) is arranged in a linearly movable manner, a replacement element (22), which exerts on the plunger (12) at least temporarily working a force, which acts in the direction towards the front side (4) of the inner chamber, a gas opening 24 for the injection of surrounding air or a gas under pressure in the interior space and a gas outlet orifice (26) for the evacuation of the gas from the inner chamber, the gas outlet orifice (26) can be connected with a low pressure source, being arranged in the inner chamber between the plunger (12) working and a rear side (6) of the inner chamber a control plunger (14) with linear movement, the control plunger (26) in a first position not covering the gas outlet port (26) and covers the gas inlet hole (24) and in a second position does not cover the gas orifice (24) and covers the gas outlet orifice (26), the control piston (14) being mounted mobilely relative to the working piston (12), being arranged in the piston (12) of work and / or in the control piston (14) a drag element (18, 20, 42) and / or a spacer (30), the drag element (18, 20, 42) carrying the piston (14) of command to the first position, when there is a movement of the working piston (12) towards the front side (4) of the inner chamber and the drag element (18, 20, 42) or the spacer (30) is carrying the piston (14) control to the second position, when there is a movement of the working piston (12) towards the rear side (6) of the inner chamber, covering the control piston (14) in a third position between the first position and the second position both the gas inlet port (24), and also the gas outlet port (26).Motor (1) de vacío, que posee un émbolo (12) de trabajo, una cámara interior en la que el émbolo (12) de trabajo esta dispuesto de manera movible linealmente, un elemento (22) de reposición, que ejerce sobre el émbolo (12) de trabajo al menos temporalmente una fuerz
