Ntn Corporation

Yuki Saoyama

Makoto Muramatsu

Yui Masuda

Tatsuya Yamasaki

Masaaki Eguchi

Makoto Yasui

A locking mechanism capable of locking and unlocking the rotation of the rotor shaft of an electric motor is constituted by a plurality of recesses formed in one side surface of one gear of a plurality of gears of a reduction gear mechanism. A locking pin is movable toward and away from the recesses, and is configured such that when the locking pin moves toward the recesses, the locking pin engages in one of the recesses and locks the one gear. A linear solenoid is configured to move the locking pin toward and away from the recesses, and a protrusion extends from one end surface of each recess.

Electric linear motion actuator and electromechanical brake system

An electric linear motion actuator includes a locking mechanism for locking and unlocking the rotor shaft of an electric motor. The locking mechanism includes circumferentially arranged locking holes provided in a gear of a reduction gear mechanism, a locking pin moved toward and away from the locking holes, and engaged in one locking hole to lock the gear when the locking pin is moved toward the gear, and a linear solenoid for moving the locking pin toward and away from the gear. The plunger of the linear solenoid and the locking pin are formed as separate parts, and disposed coaxial with each other with their end faces axially facing each other. This prevents the moment load applied from the gear to the locking pin from acting on the plunger, thereby preventing damage to a bobbin slidably supporting the radially inner surface of the plunger.

Electric linear motion actuator and electric brake system

An electric linear motion actuator includes: a rotary shaft to be driven by an electric motor; a plurality of planetary rollers kept in rolling contact with a cylindrical surface formed on an outer periphery of the rotary shaft; a carrier which retains the planetary rollers such that the planetary rollers are rotatable about axes thereof while revolving around the rotary shaft, and of which axial movement is restricted; and an outer ring member surrounding the planetary rollers and supported so as to be slidable in an axial direction. Helical ribs are formed on an inner periphery of the outer ring member; and circumferential grooves are formed on an outer periphery of each of the planetary rollers so as to be engaged with the helical ribs. A rotation of the rotary shaft is thus converted to a linear motion of the outer ring member.

Electric linear motion actuator

An electric linear motion actuator is provided which can set the clearance during normal braking operation of an electric brake system. The linear motion actuator includes a load sensor for detecting the magnitude of the load with which a friction pad is pressed against the brake disk, a temperature sensor for compensating for the influence of temperature on the load sensor, and an electronic control unit. The electronic control unit is adapted to calculate a target rotational angle from the position of the electric motor corresponding to the magnitude of the load detected by the load sensor to the position of the electric motor where the clearance is at a predetermined value, and control the electric motor to rotate the electric motor by the target rotational angle.

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Shizuoka, Japan

Yuki Saoyama