Motor gear unit for disc brake apparatus and disc brake apparatus
A motor gear unit for a disc brake apparatus is provided. A speed reduction mechanism is connected to a first connection portion of a motor shaft of an electric motor. A non-excited operation type brake is connected to a second connection portion of the motor shaft. 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.
1. 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,
the speed reduction mechanism includes a worm connected to the first connection portion, a worm wheel meshed with the worm, and a plurality of gears, and
a rotation central axis of the worm wheel and rotation central axes of the plurality of gears are disposed substantially parallel to a central axis of the rotary-to-linear motion conversion mechanism.
2. The motor gear unit for the disc brake apparatus according to claim 1 , wherein
the housing further includes a first partition wall partitioning the motor accommodating portion and the gear accommodating portion.
3. A disc brake apparatus comprising:
a caliper including a cylinder on an axially inner side of a rotor;
a piston fitted into the cylinder;
a rotary-to-linear motion conversion mechanism, disposed in the cylinder, and configured to push out the piston toward the rotor by converting a rotary motion into a linear motion; and
a motor gear unit, supported by and fixed to the caliper, and configured to drive the rotary-to-linear motion conversion mechanism, wherein
the motor gear unit is the motor gear unit for the disc brake apparatus according to claim 2 .
4. The motor gear unit for the disc brake apparatus according to claim 1 , wherein
the housing further includes a second partition wall partitioning the motor accommodating portion and the brake accommodating portion.
5. A disc brake apparatus comprising:
a caliper including a cylinder on an axially inner side of a rotor;
a piston fitted into the cylinder;
a rotary-to-linear motion conversion mechanism, disposed in the cylinder, and configured to push out the piston toward the rotor by converting a rotary motion into a linear motion; and
a motor gear unit, supported by and fixed to the caliper, and configured to drive the rotary-to-linear motion conversion mechanism, wherein
the motor gear unit is the motor gear unit for the disc brake apparatus according to claim 4 .
6. A disc brake apparatus comprising:
a caliper including a cylinder on an axially inner side of a rotor;
a piston fitted into the cylinder;
a rotary-to-linear motion conversion mechanism, disposed in the cylinder, and configured to push out the piston toward the rotor by converting a rotary motion into a linear motion; and
a motor gear unit, supported by and fixed to the caliper, and configured to drive the rotary-to-linear motion conversion mechanism, wherein
the motor gear unit is the motor gear unit for the disc brake apparatus according to claim 1 .
7. The disc brake apparatus according to claim 6 , wherein
a plurality of cylinders, a plurality of pistons, and a plurality of rotary-to-linear motion conversion mechanisms are provided.
8. The disc brake apparatus according to claim 6 , wherein
the rotary-to-linear motion conversion mechanism includes a spindle and a nut, and
the speed reduction mechanism transmits rotation of the electric motor to the spindle.
9. 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.
10. The motor gear unit for the disc brake apparatus according to claim 9 , wherein
two final gears are provided, and
an imaginary line orthogonal to a rotation central axis of each of the two final gears and the motor shaft are arranged substantially parallel to each other.
11. A disc brake apparatus comprising:
a caliper including a cylinder on an axially inner side of a rotor;
a piston fitted into the cylinder;
a rotary-to-linear motion conversion mechanism, disposed in the cylinder, and configured to push out the piston toward the rotor by converting a rotary motion into a linear motion; and
a motor gear unit, supported by and fixed to the caliper, and configured to drive the rotary-to-linear motion conversion mechanism, wherein
the motor gear unit is the motor gear unit for the disc brake apparatus according to claim 10 .
12. A disc brake apparatus comprising:
a caliper including a cylinder on an axially inner side of a rotor;
a piston fitted into the cylinder;
a rotary-to-linear motion conversion mechanism, disposed in the cylinder, and configured to push out the piston toward the rotor by converting a rotary motion into a linear motion; and
a motor gear unit, supported by and fixed to the caliper, and configured to drive the rotary-to-linear motion conversion mechanism, wherein
the motor gear unit is the motor gear unit for the disc brake apparatus according to claim 9 .