Patent ID: 7938211

Claim:
A brake structure for a wheel rotating device, which comprises a motor provided in a wheel and is driven for rotating the wheel, and a braking mechanism for actuating a brake to brake the wheel, wherein the motor comprises: a motor housing; a stator positioned in and fixed to the motor housing; and a rotor positioned in the motor housing and facing to the stator, wherein the braking mechanism comprises: a brake rotor to rotate with the wheel; frictional members to be in contact with the brake rotor for the generation of a braking force; a pressing force generating unit for generating pressing force of the frictional members so that the frictional members are urged to and pressed against the brake rotor by supplying brake fluid through a brake fluid passage to transmit fluid pressure; and a housing for the pressing force generating unit; wherein the brake fluid passage is formed inside a wall of the motor housing, and is connected to a brake fluid supply port provided in the housing for the pressing force generating unit, wherein the brake rotor is a disk rotor, and the frictional members are a first frictional member and a second frictional member positioned opposite to each other with the disk rotor interposed therebetween, wherein the first frictional member is directly fixed to the motor housing and the second frictional member is fixed to the pressing force generating unit, and the pressing force generating unit is accommodated in the housing for the pressing force generating unit and is movable in a direction of a rotation axis of the disk rotor, and wherein the housing for the pressing force generating unit is attached to the motor housing such as to be non-contacting with the outer periphery of the disk rotor, and wherein the pressing force generating unit is located on a side of the brake rotor, opposite to the motor housing.