Motor unit and a wheeled vehicle and a machine tool equipped with such a motor unit

Abstract

A motor unit is provided (1) having an electric motor (2) and a support (3). The motor (2) has a tool-holder shaft (4) with a rotor (7) for rotating the shaft (4), a stator (8) and a frame (9). The motor unit (1) has selectively activatable first and second configurations and an activation device (10) for the passage from one configuration to another. The motor (2) and the support (3) are, independently of a rotational movement of the rotor (7), mounted so as to be fixed axially in the first configuration. The tool-holder shaft (4), at its end (6) opposite its tool-holder end (5), partially projects from the frame (9) and has, at its projecting portion, a screw thread (11). The tool-holder shaft (4) is mounted so as to be fixed axially with respect to the rotor (7) and to the stator (8). In the second configuration, the motor (2) and the support (3) are, depending on the rotational movement of the rotor (7), mounted so as to be movable axially relative to one another in a direction parallel to the shaft (4) in order to vary the position of the tool-holder end (5) of the shaft (4) relative to the support (3). Each axial relative position between the tool-holder end (5) of the shaft (4) and the support (3) are a stable position.

Dependencies are inferred from the claim text.