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    • 5. 发明公开
    • TWO-STAGE TRANSMISSION FOR ELECTRICALLY DRIVEN VEHICLE
    • EP3889464A1
    • 2021-10-06
    • EP20840259.4
    • 2020-06-26
    • Unipres Corporation
    • SHIROSAKI, RyoSUZUKI, RyosukeNEZU, HideyukiOONO, YutaFURUKAWA, Kentaro
    • F16H3/54
    • The present invention relates to a two-stage transmission for an electrically driven vehicle including a dog clutch and a friction clutch, and an object of the present invention is to prevent a torque drop when shifting gears. The two-stage transmission for the electrically driven vehicle includes a planetary gear mechanism (12), a dog clutch (28), a friction clutch (30), an armature (26) to switch between the dog clutch (28) and the friction clutch (30), and an electromagnetic coil (31) to drive the armature (26). In the dog clutch (28) and the friction clutch (30), the coupling relationship among the rotational elements of the planetary gear mechanism (12) is set such that the dog clutch (28) is fastened and the friction clutch (30) is not fastened in speed reduction (the first speed), and the dog clutch (28) is not fastened and the friction clutch (30) is fastened in speed increase (the second speed) . To prevent the torque drop when shifting the gears, a ratchet-type one-way clutch (50) is disposed such that a rotational phase position of the ratchet-type one-way clutch (50) is coincident with that of the dog clutch (28). When shifting from the second speed to the first speed, since the rotational phase of the dog clutch (28) is adjusted by the ratchet-type one-way clutch (50), the shifting is instantaneously completed without waiting operation for the phase adjustment, resulting in preventing a transmission shock.
    • 8. 发明授权
    • METHOD FOR IRONING SPLINE TEETH IN PRESSED STEPPED SHEETMETAL
    • 中光滑的牙齿方法按生产分割片
    • EP1008404B1
    • 2006-03-01
    • EP98919607.6
    • 1998-05-15
    • Unipres Corporation
    • YABUTANI, MitsumasaNITOU, Satoru
    • B21D53/28
    • B21D15/02B21D17/025B21D53/28
    • A method for ironing spline teeth by axially engaging a die (24 or 28 + 30) having a plurality of ironing working surfaces (28a, 30a) corresponding to an outer periphery of a pressed sheetmetal (1) with a punch having a plurality of ironing working surfaces (32a, 34a) corresponding to an inner peripheral configuration of the pressed sheetmetal (1), thus ironing spline teeth on respective peripheral walls (1b, 1c) of the pressed sheetmetal (1) on which a purality of peripheral walls having different diameters are provided via steps (1a). In this method, the punch is divided into a first punch (32) which cooperates with the die (28) to iron a small diameter peripheral wall (1b) and an outer periphery punch (34) which is disposed on an outer periphery of the punch (32) and cooperates with the die (30) to iron a large diameter peripheral wall (1c) and to descend to and stop at a step (29) of the die, and the first punch (32) and the outer periphery punch (34) are made to descend together to iron the large diameter peripheral wall (1c) and thereafter iron the small diameter peripheral wall (1b) by lowering a pressing force of the outer periphery punch (34) below a pressing force for ironing, so that descending (ironing) of the first punch (32) elongates the small diameter peripheral wall (1b) smoothly in an axial direction and reduces the amount of a material flowing into the step (1a), thereby preventing the formation of any excessively thick portion on the step (1a).