AKEBONO BRAKE INDUSTRY CO., LTD.

A brake system ( 100 ) that includes a brake caliper ( 102 ); a brake piston ( 118 ) supported by the brake caliper; a brake pad ( 104, 106 ) supported by the brake caliper; a rotary to linear stage mechanism ( 126 ); a motor ( 136 ) configured to drive the rotary to linear stage mechanism to move the brake piston and the brake pad against a brake rotor to generate a clamping force; and a locking device ( 146 ) configured to maintain a position of the rotary to linear stage mechanism after the clamping force has been created, wherein the locking device comprises a bistable solenoid ( 148 ). The motor is located on one side of the rotary to linear stage mechanism and the locking device is located on another side of the rotary to linear stage mechanism.

A brake system and a method of performing a release operation with the brake system. The brake system comprises a sliding caliper body and a fixed caliper body. The fixed caliper body has a stop formed therein and accommodates a spindle nut that mates with the stop in a release operation. The brake system comprises a spindle that drives the spindle nut in a second direction during the release operation. Continued translation of the spindle after mating of the spindle nut with the stop drives the sliding caliper body in a first direction opposing the second direction.

A friction material includes a friction modifier, a binder, and a fibrous material. An alkali metal salt of phosphoric acid and a metal sulfide are contained as the friction modifier. The alkali metal salt of phosphoric acid may include trisodium phosphate. A wax containing, as a main component, an ester of a higher fatty acid and a higher alcohol may be contained as the friction modifier.

There is provided a non-excited operation type brake for a brake device that is configured to allow rotation of a motor shaft when energized and that is configured to stop the rotation of the motor shaft when de-energized, including: a casing that is configured to function as a yoke and that includes a coil accommodating portion having a substantially U-shaped cross section and formed in an annular shape as a whole. The casing further includes an auxiliary yoke that has a substantially cylindrical shape and that is fitted inside the coil accommodating portion, the auxiliary yoke being separated from the coil accommodating portion.

A piston for a disc brake device includes: a cylindrical wall portion; a bottom portion; and a plurality of columnar ribs. The cylindrical wall portion includes an outer diameter side cylindrical portion including a seal sliding contact portion on an outer peripheral surface, and an inner diameter side cylindrical portion that includes a pad contact portion at an end portion on the other side in an axial direction. The plurality of columnar ribs are disposed to be inclined with respect to a piston central axis, and each have an end portion on one side in a length direction connected to a side surface on the other side in the axial direction of the bottom portion, and an end portion on the other side in the length direction connected to an inner peripheral surface of the inner diameter side cylindrical portion.

A brake system comprising: (a) a caliper housing connected to or formed with a piston housing; (b) a piston having a piston face seated in a piston main, wherein the piston is at least partially secured within the piston housing; and (c) a ball and nut assembly (BNA) adapted to move the piston face relative to the piston main to engage a brake pad of the brake system.

A method of controlling an electromechanical brake system. The method comprises measuring a voltage of a motor, measuring a current of the motor, and estimating a position of a component of the electromechanical brake system based on the voltage and the current. The method comprises estimating a force imposed by the component based on the voltage and the current, and estimating a hydraulic pressure associated with a hydraulic brake system. In an apply operation, the force of the component is corrected based on the hydraulic pressure. In a release operation, the position of the component is corrected based on the hydraulic pressure.

A brake system comprising a torque limiter assembly that sets a torque limit and associated with an electromechanical actuation system. The torque limiter assembly comprises a ring gear meshed with two or more planetary gears, the ring gear comprising a first race extending circumferentially therearound. The torque limiter assembly comprises a pre-loaded member comprising a second race extending circumferentially therearound. Balls are engaged between the first and second races. The first and/or second races comprise a series of peaks and valleys, and slopes extending therebetween. Below the torque limit, the balls are engaged within the valleys causing the ring gear to remain rotationally captive and the planetary gears to orbit. At and above the torque limit, the balls slip over the peaks, causing the ring gear to rotate and the planetary gears to remain orbitally captive.

A motor gear unit for a disc brake apparatus includes an electric motor, a speed reduction mechanism configured to transmit rotation of the electric motor to a plurality of rotary-to-linear motion conversion mechanisms arranged in a plurality of cylinders provided in a caliper, and a housing accommodating the electric motor and the speed reduction mechanism. The speed reduction mechanism includes a plurality of final gears connected directly or via another member to the plurality of rotary-to-linear motion conversion mechanisms and a power distribution mechanism that includes one support shaft and that is configured to distribute and transmit input power to the plurality of final gears. The power distribution mechanism is supported by the housing by supporting and fixing end portions of the support shaft on axially both sides to the housing.

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.