US 11,731,601 B2
Brake system
Takanori Matsuki, Aichi-ken (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Filed on Nov. 6, 2020, as Appl. No. 17/91,250.
Claims priority of application No. JP2019-207423 (JP), filed on Nov. 15, 2019.
Prior Publication US 2021/0146901 A1, May 20, 2021
Int. Cl. F16D 59/02 (2006.01); B60T 13/68 (2006.01); F16D 55/22 (2006.01); F16D 65/22 (2006.01); F16D 121/22 (2012.01); F16D 129/08 (2012.01)
CPC B60T 13/686 (2013.01) [F16D 55/22 (2013.01); F16D 65/22 (2013.01); F16D 2121/22 (2013.01); F16D 2129/08 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A brake system comprising:
an electromagnetic brake device configured to apply a brake to a rotary shaft when current is not applied to the brake system and release the brake on the rotary shaft when current is applied to the brake system; and
a brake release device configured to forcibly release the brake on the rotary shaft when current is not applied to the brake system, wherein
the electromagnetic brake device includes:
a brake disc integrated with the rotary shaft;
a stator disposed facing the brake disc;
a brake plate positioned opposite to the stator with respect to the brake disc;
an armature disposed between the brake disc and the stator and cooperating with the brake plate to hold the brake disc between the armature and the brake plate;
an urging member disposed between the stator and the armature and configured to urge the armature such that the armature is pressed against the brake disc; and
a magnet coil disposed in the stator and configured to be excited when current is applied to the magnet coil, and
the brake release device includes:
a guide member having a tube shape;
a release plate disposed within the guide member and engaged with the armature; and
a transfer unit configured to move the release plate in a direction in which the rotary shaft extends, wherein
the transfer unit is disposed within the guide member, and includes a bag that is configured to expand and contract in the direction in which the rotary shaft extends and an air supplier that is configured to supply air into the bag.