Eco 4×4 front-axle transmission having an integrated shut-off unit for all wheel drives
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsGero Bansemir, Hans Rastel, Dirk Stammann
Life of this patent
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Abstract
An axle drive mechanism includes a driving toothed wheel, a drive mechanism housing, a differential cage, a differential gear, a first and a second output shaft, and at least one shiftable torque transmission device. The at least one shiftable torque transmission is disposed between the driving toothed wheel and the first output shaft and includes a torque transmission region. The torque transmission region is at least partially disposed between said differential cage bearings in the axial direction.
Claims10
An axle drive mechanism, comprising:
- a driving toothed wheel;
- a drive mechanism housing;
- a differential cage, which is mounted rotatably in the drive mechanism housing by way of a first and a second differential cage bearing, with said bearings being spaced apart from one another in an axial direction;
- a differential gear;
- a first and a second output shaft;
- and
- at least one shiftable torque transmission device, which is disposed radially inward relative to the driving toothed wheel and the first output shaft and comprises a torque transmission region, wherein the torque transmission region is at least partially disposed between said differential cage bearings in the axial direction, wherein
- the torque transmission device comprises a radially inner output part and a radially outer driving part, and the driving part can make contact with the output part in said torque transmission region, and the output part can be connected to the driving part in a form-locked manner, and
- the driving part is mounted displaceably in the axial direction.
A method for operating an axle drive mechanism, comprising the acts of:
- ascertaining a rotational speed of a radially inner output part, wherein the axle drive mechanism, includes a driving toothed wheel, a drive mechanism housing, a differential cage, which is mounted rotatably in the drive mechanism housing by way of a first and a second differential cage bearing, with said bearings being spaced apart from one another in an axial direction, a differential gear, a first and a second output shaft, and at least one shiftable torque transmission device, which is disposed radially inward relative to the driving toothed wheel and the first output shaft and comprises a torque transmission region, wherein the torque transmission region is at least partially disposed between said differential cage bearings in the axial direction, and wherein the torque transmission device comprises the radially inner output part and a radially outer driving part and the driving part can make contact with the output part in said torque transmission region, and the output part can be connected to the driving part in a form-locked manner, and the driving part is mounted displaceably in the axial direction;
- ascertaining a rotational speed of the radially outer driving part;
- determining an equalizing speed from said rotational speeds (n8c, n8d);
- driving the driving toothed wheel until the equalizing speed reaches or drops below a predefinable threshold value;
- transferring the torque transmission device into a second operating state.
Dependencies are inferred from the claim text.