Vibrator with electric motor drive inside casing - has rolling element at free end of electric motor shaft mounted in universal joint bearing

摘要

The conical roll body (15) of the vibrator suitable for concrete compacting is seated at the free end of shaft (14) of an electric motor (8) mounted inside the casing (2). The shaft (14) is held at one end in the universal joint bearing (11) with the roll body and the roll path tapering towards this bearing. Since the electric drive motor is inside the vibrator casing there is no longer any need for the heavy flexible shaft supply pipe for the drive energy of the vibrator. Preferably, the motor stator (7) is mounted between the universal joint bearing and the roll body. A greater degree of efficiency of the motor is achieved is the armature assembly (20) and/or the bore of the stator housing are conical so that a parallel air gap is formed on one side when the shaft (14) is deflected to a maximum.