Abstract: A select mechanism for executing select operation and a change speed mechanism for executing change speed operation are incorporated into the automatic speed-change apparatus. The change speed mechanism is provided with a change speed motor 14 capable of controlling forward and backward rotation, a single or a plurality of intermediate shaft gear mechanisms 16 reducing and then transmitting the speed of the rotation of the speed change motor and each consisting of a large diameter gear 17, a small diameter gear 18 and an intermediate shaft 19 parallel to a select and change speed pull-rod 2, a change speed gear 24 engaged with the intermediate shaft gear mechanisms to transmit rotation and fixed to the select and change speed pull-rod 2, and a change speed sensor 28 provided on the outer end of the select and change speed pull-rod 2 and detecting the operating angle of the pull-rod 2 in rotation direction.

Abstract: The object is to provide a compact speed-change apparatus for performing the automatic gear shifting of the conventional gear transmission.In this apparatus the select mechanism comprises a select motor 2 rotatable forward and backward, gears 4, 6 for transmitting the rotation of the select motor 2, and a select-shift sleeve 7 receiving the rotation and one end of which is connected with a select-shift rod 9 of the gear transmission; and the shift mechanism comprises a shift motor 10, a gear 12 to be rotated by the shift motor 10, a swing gear 13 meshing with the gear 12 and swinging on an intermediate shaft 14 as a fulcrum, and a connecting rod 16 one end of which is connected with the swing gear 13 and the other end of which is connected with said select-shift sleeve 7.

Abstract: For an automatic hydraulic pressure generator in which a hydraulic master cylinder driven by a computer-controlled motor lets in or takes out a friction clutch, an operation device is provided that can make the piston rod of the hydraulic master cylinder operate at high torque and at high speed and further that is advantageous in durability of its conversion mechanism from rotary motion to linear motion.

Abstract: An automatic operating apparatus for a friction clutch is disclosed which apparatus performs the disconnection of the clutch of a transmission by the assistance of the accumulated load in a load accumulator which can perform the accumulation and the release of the load by a simple mechanism. In the automatic clutch operating apparatus having a reducer 9, 13 to reduce the forward rotating force of a motor 1 and a movement converter 10, 12 to make a piston rod 4a of a hydraulic master cylinder 2 move in the axial direction so as to disconnect the friction clutch, a link mechanism is constructed for accumulating the loads due to the rotating force of the motor 1 and the repulsive force of the clutch spring in the load accumulator 16, 18 when the motor 1 is rotated backward to connect the friction clutch and for releasing the accumulated loads when the motor 1 is rotated forward to disconnect the clutch.

Abstract: The object is to provide a small-sized speed-change apparatus for performing the automatic gear shifting of the conventional gear transmission. In the speed-change apparatus 1, the select mechanism comprises a select motor 6 controllable for forward and backward rotation, gears 7, 8 for transmitting the rotation, a select-shift shaft 11 to be rotated forward and backward through said gears 7, 8 and connected with the select-shift rod 5 of the gear transmission M; and the shift mechanism comprises a piston 12 for moving the select-shift shaft 11 in the axial direction, hydraulic chambers 13, 14 accommodating the piston 12 and a shift-operating hydraulic-pressure generator for supplying the hydraulic oil through hydraulic tubes into the hydraulic chambers 13, 14.

Abstract: A speed-change apparatus for satisfactorily performing the automatic gear shifting of the conventional gear transmission by controlling two motors comprises a select mechanisms including a stepping-motor 2, a select shaft provided with a select gear meshing with a motor gear 3 for transferring the rotation, a device for connecting the select shaft with the select-shift rod of the gear transmission, and a select sensor 6 for detecting an angle of rotation of the select shaft; the shift mechanism comprises a shift motor 9, an intermediate shaft 12, an actuator gear 11 meshing with a motor gear 10 for transferring rotation, a long actuator gear 13 provided on the periphery of the intermediate shaft 12, a shift shaft provided with a male screw 15, a cylindrical slider 17 with a female screw 16 meshing with the male screw 15 a shift gear 14 meshing with the long actuator gear 13, a mechanism coupled with the slider 17 for connecting the slider 17 with the select-shift rod, and a stroke sensor 19 for detecting an a

Abstract: The object is to provide a speed-change apparatus wherein the automatic speed change of the conventional gear transmission can be satisfactorily performed by controlling a single motor and a single electromagnetic clutch. This apparatus includes a motor, an actuator gear, a select shaft having a select gear engaging with said actuator gear, a clutch, and a sleeve for moving in the axial direction; a shift gear engaging with said actuator gear, and a slider connected with said shift gear and connected with said sleeve through a slider bearing and further having a female screw engaging with a male screw on said select shaft.