Motor gear unit for disc brake apparatus and disc brake apparatus

A motor gear unit for a disc brake apparatus, comprising:

• a housing;
• an electric motor;
• a speed reduction mechanism;
• and
• a non-excited operation type brake, wherein
• the housing includes a motor accommodating portion, a gear accommodating portion, and a brake accommodating portion, and is supported by and fixed to a caliper of the disc brake apparatus,
• the electric motor includes a motor shaft which includes a first connection portion connected to the speed reduction mechanism on an axially one side portion and a second connection portion connected to the non-excited operation type brake on an axially another side portion, and is disposed inside the motor accommodating portion,
• the speed reduction mechanism is connected to the first connection portion, transmits a rotation of the electric motor to a rotary-to-linear motion conversion mechanism disposed in a cylinder of the caliper, and is disposed inside the gear accommodating portion,
• the non-excited operation type brake is connected to the second connection portion, prevents a rotation of the motor shaft during a non-energization period, and is disposed inside the brake accommodating portion,
• in a state where the disc brake apparatus is attached to a vehicle body, the motor shaft is disposed so as to be orientated in an upper-lower direction, and the non-excited operation type brake is disposed above the electric motor, and
• the speed reduction mechanism includes a worm connected to the first connection portion, a worm wheel meshed with the worm, a plurality of final gears connected directly or via another member to the rotary-to-linear motion conversion mechanism, and a power distribution mechanism configured to distribute and transmit an input power to the plurality of final gears.