Tatsuhiko Goi

Bio: Tatsuhiko Goi is an academic researcher from Kawasaki Heavy Industries. The author has contributed to research in topics: Rotor (electric) & Continuously variable transmission. The author has an hindex of 15, co-authored 80 publications receiving 631 citations. Previous affiliations of Tatsuhiko Goi include NSK Ltd..

Planetary gear system

Abstract: A planetary gear device (1) is provided with: a sun gear (5) having outer teeth; a plurality of planet gears (7) having outer teeth and which meshes with the sun gear; a ring gear (9) having inner teeth and which meshes with the planet gears; and a baffle unit (35) that is positioned between adjoining planet gears, and the sides of which (37F, 37R) are close to the planet gears. The baffle unit (35) is provided with: oil feed holes (47) through which oil lubricant (OL) is sprayed towards meshing parts (43, 45) between the planet gears and the sun gear and which are disposed at the tip (41) facing the outer periphery of the sun gear (5); and a collection port (55) that is disposed on the side surface and which collects the sprayed oil lubricant (OL) in the baffle unit (35).

Aircraft starter generator

Abstract: A starter generator has an electric rotating machine having a rotating shaft. The rotating machine is designed to carry on two reverse operations- motor and generator. A first clutch is connected between the rotating machine and the first rotating shaft for transmitting rotations of the rotating machine to the first rotating shaft. A second clutch is connected between the rotating machine and the second rotating shaft for transmitting rotations of the second rotating shaft to the rotating machine. A continuously variable transmission is provided for changing the number of rotations transmitted from the second rotating shaft to the rotating machine. A control is designed to carry our first and second modes. In the first mode, the rotating machine is supplied with electric power to rotate the rotating shaft and thereby rotations of the rotating shaft are transmitted through the first clutch to the first rotating shaft. In the second mode, the number of rotations of the rotating shaft of the rotating machine is kept constant by controlling a transmission ratio of the continuously variable transmission.

Planetary gear system and gear reducer

Abstract: A planetary gear system ( 1 ) includes: a sun gear ( 5 ) having external teeth; a ring gear ( 9 ) having internal teeth; at least one planet gear ( 7 ) having external teeth meshed with the external teeth of the sun gear and the internal teeth of the ring gear. The planet gear ( 7 ) has, at its outer circumferential face, the external teeth which are formed of a pair of sets of teeth aligned in an axial direction and an annular groove ( 17 ) which is formed between the pair of sets of teeth. The planetary gear system ( 1 ) further includes: a fixed support shaft ( 23 ) provided for each of the at least one planet gear ( 7 ) and configured to rotatably support the planet gear ( 7 ) via a bearing, the bearing including a pair of rolling element rows ( 72 ) aligned in the axial direction; an oil supply path (LP) through which lubricating oil is supplied, at an inner side of the planet gear ( 7 ), to the pair of rolling element rows ( 72 ); and an oil discharge path (oil outlet 91 ) which extends through the planet gear ( 7 ) and through which the lubricating oil is discharged to the annular groove ( 17 ) from space between the pair of rolling element rows ( 72 ) which are provided at the inner side of the planet gear ( 7 ).

Speed change control method and speed change controller

Abstract: A speed change control method of controlling a speed change ratio of a continuously variable transmission mechanism including a traction continuously variable transmission, includes: estimating a tilt angle of a power roller included in the continuously variable transmission based on an input rotating speed and an output rotating speed of the continuously-variable transmission mechanism; estimating a position of the power roller based on an estimated tilt angle obtained by the tilt angle estimating step and a command signal given to a driving device of adjusting the tilt angle of the power roller; and executing a feedback control operation based on an estimated position of the power roller obtained by the position estimating step.

Starting and generating apparatus for engine

Abstract: The invention is a starting and generating apparatus for an engine, including: a rotator configured to be used as a generator driven by an engine as well as used as a starter motor for starting the engine; a power transmission mechanism configured to connect the engine with the rotator; a starter drive unit configured to supply an electricity to the rotator to drive the rotator as the starter motor when the engine is to be started; a clutch mechanism configured to shut off a power transmission from the engine to the power transmission mechanism when the engine is to be started; and a clutch control unit configured to bring the clutch mechanism into a connected state when a rotational speed of the rotator has reached a given rotational speed at which the engine can be started.

Power screwdriver having rotary input control

Abstract: A power tool includes an output shaft configured to rotate about a longitudinal axis, a motor drivably connected to the output shaft to impart rotary motions thereto, and a rotational motion sensor spatially separated from the output shaft and operable to determine the user-imparted rotational motion of the power tool with respect to the longitudinal axis. A controller is electrically connected to the rotational motion sensor and the motor. The controller determines angular velocity of the power tool about the axis, rotational displacement of the power tool about the axis, and/or a direction of the rotational displacement using input from the rotational motion sensor. The controller then controls the motor according to the angular velocity, the rotational displacement, and/or the direction of the rotational displacement.

Power tool having rotary input control

Abstract: A power tool includes a housing, a motor, an output member driven by the motor, and a reaming attachment coupled to the output member. The reaming attachment has a front end portion selectively driven in rotation by the output member to drive a fastener into a workpiece, and a reaming portion selectively driven in rotation by the output member to remove material from an end surface of a conduit. A rotational motion sensor in the housing is operable to detect rotational motion of the housing about an axis. A controller receives a signal indicative of rotational motion from the sensor, determines a direction of the rotational motion of the housing, and drives the motor in a direction corresponding to the direction of rotational motion of the housing.

Power tool anti-kickback system with rotational rate sensor

Abstract: A control system is provided for use in a power tool The control system includes: a rotational rate sensor having a resonating mass and a controller electrically connected to the rotational rate sensor The rotational rate sensor detects lateral displacement of the resonating mass and generates a signal indicative of the detected lateral displacement, such that the lateral displacement is directly proportional to a rotational speed at which the power tool rotates about an axis of the rotary shaft Based on the generated signal, the controller initiates a protective operation to avoid further undesirable rotation of the power tool The controller may opt to reduce the torque applied to shaft to a non-zero value that enables the operator to regain control of the tool

Engine power extraction control system

Abstract: An engine power extraction control system controls the main propulsion engines and the electrical machines that are coupled thereto to supply an appropriate amount of aircraft thrust and electrical energy to the aircraft. The engines and electrical machines are also controlled so that the propulsion thrust that is generated is split between the various turbines in the main propulsion engines to maintain an adequate surge margin and to minimize residual thrust generation.

More electric aircraft starter-generator multi-speed transmission system

Abstract: A turbofan gas turbine propulsion engine includes a multi-speed transmission between the high pressure and low pressure turbines and associated high pressure and low pressure starter-generators. The multi-speed transmission reduces the operating speed range from the low pressure turbine to its associated starter-generator, and is configurable to allow the starter-generator associated with the low pressure turbine to supply starting torque to the engine.