Actuator with auxiliary motor
AssigneeRobert Bosch GmbH
InventorRaul Nava Gonzalez
Life of this patent
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Abstract
An electronic transmission range select actuator (ETRSA) includes two independent drive systems that are each able to actuate a common shaft, for example an output shaft of the ETRSA, via a coupling device disposed between and connecting the gear trains of each system. The first drive system of the two independent drive systems is used during normal vehicle operation to change the transmission gear range to a desired gear range. The second drive system is used in case of abnormal operation of the first drive system to return the vehicle transmission to the park transmission range.
Claims18
A transmission system including
- an output shaft;
- a first gear train that connects a first actuator to the output shaft and transmits rotational output of the first actuator to the output shaft, the first gear train including a carrier that is fixed to the output shaft;
- a second gear train that connects a second actuator to the output shaft and transmits rotational output of the second actuator to the output shaft, the second gear train including a drive ring that surrounds the carrier, wherein
- in some operating conditions of the transmission system, the output shaft is driven by the first actuator to rotate over a limited rotational range via the first gear train and the drive ring is configured to provide lost motion relative to the carrier over the limited rotational range, and
- in other operating conditions of the transmission system, the output shaft is driven by the second actuator via the second gear train and the drive ring is configured to engage the carrier to adjust an angular orientation of the output shaft.
The transmission system of clamp 8, wherein the second gear train remains idle when the first gear train is operating.
An electronic transmission range select actuator for setting a transmission range of a vehicle, the electronic transmission range select actuator comprising
- an output shaft configured to be connected to a transmission of the vehicle;
- a first gear train that connects a first actuator to the output shaft and transmits rotational output of the first actuator to the output shaft, the first gear train including a carrier that is fixed to the output shaft;
- a second gear train that connects a second actuator to the output shaft and transmits rotational output of the second actuator to the output shaft, the second gear train including a drive ring that surrounds the carrier, wherein
- in some operating conditions of the transmission system, the output shaft is driven by the first actuator to rotate over a limited rotational range via the first gear train and the drive ring is configured to provide lost motion relative to the carrier over the limited rotational range, and
- in other operating conditions of the transmission system, the output shaft is driven by the second actuator via the second gear train and the drive ring is configured to engage the carrier to adjust an angular orientation of the output shaft.
Dependencies are inferred from the claim text.