US 12,480,552 B2
Non-excited operation type brake for brake device and disc brake device
Shinichi Yamadera, Tokyo (JP); and Quyen Huu Nguyen, Tokyo (JP)
Assigned to AKEBONO BRAKE INDUSTRY CO., LTD., Tokyo (JP)
Filed by AKEBONO BRAKE INDUSTRY CO., LTD., Tokyo (JP)
Filed on Mar. 7, 2023, as Appl. No. 18/118,304.
Claims priority of application No. 2022-035879 (JP), filed on Mar. 9, 2022.
Prior Publication US 2023/0287948 A1, Sep. 14, 2023
Int. Cl. F16D 59/02 (2006.01); F16D 55/226 (2006.01); F16D 55/36 (2006.01); F16D 65/18 (2006.01); H02K 7/102 (2006.01); B60T 1/06 (2006.01); B60T 13/74 (2006.01); F16D 121/22 (2012.01); F16D 121/24 (2012.01); F16D 125/40 (2012.01); F16D 125/48 (2012.01)
CPC F16D 65/18 (2013.01) [F16D 55/226 (2013.01); F16D 55/36 (2013.01); H02K 7/102 (2013.01); B60T 1/065 (2013.01); B60T 13/746 (2013.01); F16D 2121/22 (2013.01); F16D 2121/24 (2013.01); F16D 2125/40 (2013.01); F16D 2125/48 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A non-excited operation type brake for a brake device that is configured to allow rotation of a motor shaft when energized and that is configured to stop the rotation of the motor shaft when de-energized, comprising:
a casing that is configured to function as a yoke and that includes a coil accommodating portion having a substantially U-shaped cross section and formed in an annular shape as a whole;
a fixed plate that is fixed to the casing while being separated from the casing in an axial direction of the motor shaft;
an electromagnetic coil that is accommodated in the coil accommodating portion;
an armature that is disposed between the fixed plate and the electromagnetic coil;
a rotation disc that is disposed coaxially with the motor shaft between the fixed plate and the armature; and
a pressing spring that is configured to bias the armature in a direction away from the electromagnetic coil in the axial direction of the motor shaft, wherein
the rotation disc is engaged with the motor shaft or a shaft that is configured to rotate in synchronism with the motor shaft in a way of being displaceable relative to the axial direction of the motor shaft and not displaceable relative to a circumferential direction of the motor shaft,
the casing further includes an auxiliary yoke that has a substantially cylindrical shape and that is fitted inside the coil accommodating portion, the auxiliary yoke being separated from the coil accommodating portion,
the coil accommodating portion includes an inner peripheral side wall portion disposed on an inner side in a radial direction of the electromagnetic coil, an outer peripheral side wall portion disposed on an outer side in the radial direction of the electromagnetic coil, and a bottom wall portion connecting an end portion of the inner peripheral side wall portion and an end portion of the outer peripheral side wall portion in a radial direction of the motor shaft,
the inner peripheral side wall portion, the outer peripheral side wall portion, and the bottom wall portion have the same thickness,
the casing includes a casing body including the coil accommodating portion and the auxiliary yoke,
the coil accommodating portion includes a substantially L-shaped cut-and-raised piece on the bottom wall portion,
the auxiliary yoke includes an outward engaging piece extending toward the outer side in the radial direction at an end portion on a side opposite to the armature in the axial direction of the motor shaft, and
the auxiliary yoke is configured to be suppressed from coming off from the casing body by engagement between the cut-and-raised piece and the outward engaging piece.