Electric motor with reverse input cutoff clutch

An electric motor with a reverse input cutoff clutch, comprising:

• a motor housing;
• an output shaft including a first shaft rotatably supported on an inner side of the motor housing;
• a second shaft having a torque output portion at an intermediate portion in an axial direction of the second shaft and coaxially arranged with the first shaft;
• and a reverse input cutoff clutch arranged on the inner side of the motor housing and configured to connect the first shaft and the second shaft;
• a bearing device externally fitted to a portion of the second shaft located on an opposite side of the first shaft with the torque output portion sandwiched in the axial direction, and configured to rotatably support the second shaft at a portion that does not rotate even during use;
• a rotor arranged around the first shaft and configured to rotate integrally with the first shaft;
• and
• a stator coaxially arranged with the rotor and supported and fixed on the inside of the motor housing;
• the reverse input cutoff clutch having a function that, in a case where rotational torque is input to the first shaft, transmits the rotational torque that is input to the first shaft to the second shaft, and in a case where rotational torque is reversely input to the second shaft, completely cuts off the rotational torque that is reversely input to the second shaft, or transmits part of the rotational torque that is reversely input to the second shaft to the first shaft and cuts off the remaining portion,
• wherein the reverse input cutoff clutch includes:
• a pressed surface;
• an input portion that integrally rotates with the first shaft;
• an output portion coaxially arranged with the input portion and that integrally rotates with the second shaft;
• and
• an engaging element including a pressing surface configured to press against the pressed surface;
• the engaging element, in a case where rotational torque is input to the input portion, due to engagement with the input portion, moves in a direction causing the pressing surface to move away from the pressed surface and engages with the output portion, and in a case where rotational torque is reversely input to the output portion, due to engagement with the output portion, moves in a direction causing the pressing surface to move toward the pressed surface, and causing the pressing surface to frictionally engage with the pressed surface;
• and
• the input portion is integrally formed with the first shaft, and the output portion is integrally formed with the second shaft.

An electric motor with a reverse input cutoff clutch, comprising:

• a motor housing;
• an output shaft including a first shaft rotatably supported on an inner side of the motor housing;
• a second shaft having a torque output portion at an intermediate portion in an axial direction of the second shaft and coaxially arranged with the first shaft;
• and a reverse input cutoff clutch arranged on the inner side of the motor housing and configured to connect the first shaft and the second shaft;
• a bearing device externally fitted to a portion of the second shaft located on an opposite side of the first shaft with the torque output portion sandwiched in the axial direction, and configured to rotatably support the second shaft at a portion that does not rotate even during use;
• a rotor arranged around the first shaft and configured to rotate integrally with the first shaft;
• and
• a stator coaxially arranged with the rotor and supported and fixed on the inside of the motor housing;
• the reverse input cutoff clutch having a function that, in a case where rotational torque is input to the first shaft, transmits the rotational torque that is input to the first shaft to the second shaft, and in a case where rotational torque is reversely input to the second shaft, completely cuts off the rotational torque that is reversely input to the second shaft, or transmits part of the rotational torque that is reversely input to the second shaft to the first shaft and cuts off the remaining portion;
• wherein the reverse input cutoff clutch includes:
• a pressed surface;
• an input portion that integrally rotates with the first shaft;
• an output portion coaxially arranged with the input portion and that integrally rotates with the second shaft;
• and
• an engaging element including a pressing surface configured to press against the pressed surface;
• the engaging element, in a case where rotational torque is input to the input portion, due to engagement with the input portion, moves in a direction causing the pressing surface to move away from the pressed surface and engages with the output portion, and in a case where rotational torque is reversely input to the output portion, due to engagement with the output portion, moves in a direction causing the pressing surface to move toward the pressed surface, and causing the pressing surface to frictionally engage with the pressed surface;
• and
• the motor housing includes the pressed surface on an inner peripheral surface thereof.

An electric motor with a reverse input cutoff clutch, comprising:

• a motor housing;
• an output shaft including a first shaft rotatably supported on an inner side of the motor housing;
• a second shaft having a torque output portion at an intermediate portion in an axial direction of the second shaft and coaxially arranged with the first shaft;
• and a reverse input cutoff clutch arranged on the inner side of the motor housing and configured to connect the first shaft and the second shaft;
• a bearing device externally fitted to a portion of the second shaft located on an opposite side of the first shaft with the torque output portion sandwiched in the axial direction, and configured to rotatably support the second shaft at a portion that does not rotate even during use;
• a rotor arranged around the first shaft and configured to rotate integrally with the first shaft;
• and
• a stator coaxially arranged with the rotor and supported and fixed on the inside of the motor housing;
• the reverse input cutoff clutch having a function that, in a case where rotational torque is input to the first shaft, transmits the rotational torque that is input to the first shaft to the second shaft, and in a case where rotational torque is reversely input to the second shaft, completely cuts off the rotational torque that is reversely input to the second shaft, or transmits part of the rotational torque that is reversely input to the second shaft to the first shaft and cuts off the remaining portion, wherein
• one shaft of the first shaft and the second shaft includes a shaft recess portion in a central portion of an end surface in the axial direction, and the other of the first shaft and the second shaft includes a shaft projection portion that is inserted into an inner side of the shaft recess portion;
• and
• the output shaft includes a radial bearing arranged between an inner peripheral surface of the shaft recess portion and an outer peripheral surface of the shaft projection portion.