Abstract: An electrically operated disc brake includes a ball/ramp mechanism operable to convert rotary motion of an electric motor to linear motion and transmit the linear motion to a piston so that the piston is advanced to urge a pair of friction pads against opposite sides of a disc rotor to produce a barking force. The disc brake also includes a pad wear adjusting mechanism operable to threadably move the piston relative to an axially movable member of the ball/ramp mechanism in response to the amount of pad wear. The axially movable member has a female thread along its full length. The piston includes a piston head and a piston rod joined to the piston head. The piston rod has a male thread or threaded section. The threaded section has a length such that the piston can safely be moved together and relative to the axially movable member. The piston also has a smooth section extending from the threaded section toward the disc rotor.

Abstract: A motor-driven disk brake having a caliper containing a piston for pressing a brake pad, a rotary actuator and a rotary-to-rectilinear motion converting mechanism for transmitting rotation of the rotary actuator to the piston after converting it into a rectilinear motion. The piston is driven in response to rotation of the rotary actuator to press the brake pad against a disk rotor, thereby generating braking force. A brake releasing mechanism for returning the rotary-to-rectilinear motion converting mechanism to its initial position in the event of a failure in the rotary actuator is interposed between a rotating member and a rectilinearly moving member that constitute the rotary-to-rectilinear motion converting mechanism. The brake releasing mechanism has urging means for generating a torque in the direction for returning the piston in response to the rotation of the rotating member in the direction for advancing the piston.

Abstract: An electrically operated disc brake includes a ball/ramp mechanism operable to convert rotary motion of an electric motor to linear motion and transmit the linear motion to a piston so that the piston is advanced to urge a pair of friction pads against opposite sides of a disc rotor to produce a barking force. The disc brake also includes a pad wear adjusting mechanism operable to threadably move the piston relative to an axially movable member of the ball/ramp mechanism in response to the amount of pad wear. The axially movable member has a female thread along its full length. The piston includes a piston head and a piston rod joined to the piston head. The piston rod has a male thread or threaded section. The threaded section has a length such that the piston can safely be moved together and relative to the axially movable member. The piston also has a smooth section extending-from the threaded section toward the disc rotor.

Abstract: A motor-driven disk brake is capable of functioning as a parking brake satisfactorily without degrading the brake operating feeling and impairing the function of operating as a motor-driven brake. A stator and rotor of an electric motor are provided in a caliper body floatably supported on a carrier. The rotation of the rotor is transmitted to a piston after being converted into rectilinear motion through a ball-and-ramp mechanism and an adjusting nut. The piston, together with a claw member, presses brake pads against a disk rotor. A rotation assisting device is provided between the rear end of the rotor and a motor casing. A rotary disk constituting the rotation assisting device is rotated through a wire extending from an external operating member.

Abstract: An electric braking apparatus is disclosed in which a rotational movement from a motor is converted into linear movement that moves a brake piston to generate braking force. The electric brake apparatus can perform full parking brake function without sacrificing its original braking function. In operation, immediately after generation of braking force caused by rotation of the rotor 26, supply of electricity to the motor is turned off. After supply of electricity is turned off, however, the rotor 26 is restricted from returning to its original position due to an engagement with an engaging claw 54 via a claw wheel 50, thereby keeping the barking brake remain effective. When electricity is thereafter supplied to the motor, the rotor 26 generates rotational torque sufficiently strong to push down the engaging claw 54 for disengagement, thereby releasing the parking brake.

Abstract: In an electric disc brake a stator and a rotor of an electric motor are disposed in a caliper body, and a rotation of the rotor is converted into a linear movement by a ball-ramp mechanism. Such linear movement is transmitted to a piston, so that brake pads are urged against a disc rotor by the piston and a pawl member. Two external gears are provided on the rotor and internal gears are provided on two discs of the ball-ramp mechanism so that, due to engagement between the external gears and the internal gears, the two discs of the ball-ramp mechanism are rotated with a given rotational ratio with respect to the rotor to cause differential movement which in turn causes one of the discs to shift, thereby advancing the piston.

Abstract: A motor-driven disk brake has a first brake pad and a second brake pad disposed at opposite sides of a disk rotor, a piston disposed so as to face the first brake pad, a claw portion extending over the disk rotor and facing the second brake pad, and an electric motor disposed in the vicinity of the piston. A ball ramp mechanism for converting rotation of the electric motor to a linear motion is disposed between the first brake pad and the electric motor. When the motor is operated, the piston is reciprocally moved by the ball ramp mechanism, to thereby enable application and removal of a braking force relative to the disk rotor by the brake pads.

Abstract: A motor-driven disk brake is capable of functioning as a parking brake satisfactorily without degrading the brake operating feeling and impairing the function of operating as a motor-driven brake. A stator and rotor of an electric motor are provided in a caliper body floatably supported on a carrier. The rotation of the rotor is transmitted to a piston after being converted into rectilinear motion through a ball-and-ramp mechanism and an adjusting nut. The piston, together with a claw member, presses brake pads against a disk rotor. A rotation assisting device is provided between the rear end of the rotor and a motor casing. A rotary disk constituting the rotation assisting device is rotated through a wire extending from an external operating member. The rotation of the rotary disk is transmitted to the rotor through a projection provided on the rotary disk and an engagement pin provided at the rear end of the rotor so as to rotate the rotor, thereby activating the parking brake.

Abstract: The present invention provides a motor driven brake system for generating and releasing braking forces by reciprocal movement of a pair of pads disposed at opposite sides of a disk having an axis. The system comprises a single electric motor, an output portion adapted to be rotated by the electric motor, a first pad pressing member for pressing a first pad against the disk a second pad pressing member for pressing a second pad against the disk, a first converting mechanism and second converting mechanism. The first converting mechanism converts rotation of the output portion to a linear motion so as to move the first pad pressing member reciprocally along the axis of the disk. The second converting mechanism converts rotation of the output portion to a linear motion so as to move the second pad pressing member reciprocally along the axis of the disk.

Abstract: In an electric disc brake a stator and a rotor of an electric motor are disposed in a caliper body, and a rotation of the rotor is converted into a linear movement by a ball-ramp mechanism. Such linear movement is transmitted to a piston, so that brake pads are urged against a disc rotor by the piston and a pawl member. Two external gears are provided on the rotor and internal gears are provided on two discs of the ball-ramp mechanism so that, due to engagement between the external gears and the internal gears, the two discs of the ball-ramp mechanism are rotated with a given rotational ratio with respect to the rotor to cause differential movement which in turn causes one of the discs to shift, thereby advancing the piston.