Patent ID: 6099433
Filing Date: 2000-08-08
Classification: H02K

Abstract:
A driving unit (1), comprising;a motor (10) with a motor housing (11) and a driven shaft (12);an output shaft (2) driven by the motor (10); anda transmission device (20) coupled between the motor (10) and the output shaft (2), the transmission device (20) comprising a planetary gearing and having one input shaft (21), a first rotational output member (22), and a second rotational output member (23), wherein a ratio of transmission from the input shaft (21) to the first rotational output member (22) differs from a ratio of transmission from the input shaft (21) to the second rotational output member (23);wherein a slip coupling (30) is coupled between the first rotational output member (22) and an axial front face (14) of the motor housing (11), while the second rotational output member (23) is connected to the output shaft (2);wherein pressure means (60) are provided to exert an axially directed pressing force on the first rotational output member (22) and the motor housing (11) in order to press the first rotational output member (22) and the motor housing (11) towards each other, said pressure means (60) comprising an extended helical spring (60) which is positioned so as to be substantially coaxial to the motor (10) and extends around the motor housing (11);and wherein means are provided to vary the pressing force of the pressure means (60) in order to set a slip value of the slip coupling (30).