US 11,722,035 B2Granted

Electric motor with reverse input cutoff clutch

AssigneeNsk Ltd.

InventorsHirotaka Kishida, Toshirou Toyoda, Yuya Daikoku

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Abstract

The electric motor with a reverse input cutoff clutch has an output shaft. The output shaft is configured by connecting a first shaft and a second shaft that are coaxially arranged with each other via the reverse input cutoff clutch. The second shaft is rotatably supported to a housing by one radial bearing. The reverse input cutoff clutch has a function that, when rotational torque is inputted to the first shaft, transmits the rotational torque inputted to the first shaft to the second shaft, and when rotational torque is reversely inputted to the second shaft, completely cuts off the rotational torque reversely inputted to the second shaft, and does not transmit the rotational torque to the first shaft, or transmits a part of the rotational torque to the first shaft, and cuts off the remaining part.

Claims11

Dependent claims

An electric motor with a reverse input cutoff clutch comprising:

a housing;
an output shaft having a first shaft rotatably supported inside of the housing;
a second shaft coaxially arranged with the first shaft;
and the reverse input cutoff clutch arranged inside the housing and connecting the first shaft and the second shaft;
one radial bearing rotatably supporting the second shaft with respect to the housing;
a rotor arranged around the first shaft and integrally rotating with the first shaft;
and
a stator coaxially arranged with the rotor and supported by and fixed to the housing;
wherein
the reverse input cutoff clutch has a function that, in a case where rotational torque is inputted to the first shaft, transmits the rotational torque that is inputted to the first shaft to the second shaft, and in a case where rotational torque is reversely inputted to the second shaft, completely cuts off the rotational torque that is reversely inputted to the second shaft, or transmits a part of the rotational torque that is reversely inputted to the second shaft to the first shaft, and cuts off the remaining part,
the housing comprises a first housing element that stores the stator, a second housing element that stores the reverse input cutoff clutch, and a housing positioning means for positioning the first housing element and the second housing element in the radial direction, and
the housing positioning means includes an uneven fitting portion of a housing-side concave portion of one housing element of the first housing element and the second housing element, and a housing-side convex portion of the other housing element of the first housing element and the second housing element.

9 more elements

An electric motor with a reverse input cutoff clutch comprising:

a housing;
an output shaft having a first shaft rotatably supported inside of the housing;
a second shaft coaxially arranged with the first shaft and the reverse input cutoff clutch arranged inside the housing and connecting the first shaft and the second shaft;
one radial bearing rotatably supporting the second shaft with respect to the housing;
a rotor arranged around the first shaft and integrally rotating with the first shaft;
and
a stator coaxially arranged with the rotor and supported by and fixed to the housing;
wherein
the reverse input cutoff clutch has a function that, in a case where rotational torque is inputted to the first shaft, transmits the rotational torque that is inputted to the first shaft to the second shaft, and in a case where rotational torque is reversely inputted to the second shaft, completely cuts off the rotational torque that is reversely inputted to the second shaft, or transmits a part of the rotational torque that is reversely inputted to the second shaft to the first shaft, and cuts off the remaining part,
wherein
the reverse input cutoff clutch comprises:
a pressed surface;
an input portion integrally rotating with the first shaft;
an output portion coaxially arranged with the input portion, and integrally rotating with the second shaft;
and
an engaging element that, in a case where rotational torque is inputted to the input portion, moves in a direction away from the pressed surface due to engagement with the input portion, and by engaging with the output portion, transmits the rotational torque inputted to the input portion to the output portion;
and in a case where rotational torque is reversely inputted to the output portion, moves in a direction approaching the pressed surface due to engagement with the output portion, and by coming in contact with the pressed surface, completely cuts off the rotational torque reversely inputted to the output portion, or transmits a part of the rotational torque reversely inputted to the output portion and cuts off the remaining part.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/274,869Filed 11 Sep 2019
Priority: JP 2018-17056412 Sep 2018
Published: US 2022/0060084 A124 Feb 2022
Granted: 8 Aug 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02K 7/102
Structural association with clutches, brakes, gears, pulleys or mechanical starters: with friction brakes
H02K 7/108
Structural association with clutches, brakes, gears, pulleys or mechanical starters: with friction clutches
F16D 3/02
Yielding couplings, i.e. with means permitting movement between the connected parts during the drive: adapted to specific functions
F16D 3/50
Yielding couplings, i.e. with means permitting movement between the connected parts during the drive: with the coupling parts connected by one or…