Abstract: A transmission is provided with an engagement member rotationally moved between an engagement position where the engagement member is engaged with a parking gear to restrict the rotation of a drive shaft, and an engagement release position where the engagement member is disengaged from the parking gear to permit the rotation of the drive shaft; a support member provided in a case to be distanced from a rotational axis of the engagement member; and a pair of urging members urging the engagement member in a direction in which the engagement member rotationally moves from the engagement position toward the engagement release position, and supported on the support member respectively at symmetrical positions that are on both sides of the engagement member in a rotational axis direction of the engagement member.

Abstract: In a transmission, a lubrication oil retention section is formed to surround an area around a circumferential part of a first gear that ranges from a lubrication oil storage region to the outside of the lubrication oil storage region. In the lubrication oil retention section, the lubrication oil scooped up by the rotation of the first gear is retained between the lubrication oil retention section and the first gear at the outside of the lubrication oil storage region. The lubrication oil retention section enables the first gear to splash the lubrication oil retained at the outside of the lubrication oil storage region, toward a receiver that flows the lubrication oil to various sliding parts of the transmission.

Abstract: A transmission is provided with an engagement member rotationally moved between an engagement position where the engagement member is engaged with a parking gear to restrict the rotation of a drive shaft, and an engagement release position where the engagement member is disengaged from the parking gear to permit the rotation of the drive shaft; a support member provided in a case to be distanced from a rotational axis of the engagement member; and a pair of urging members urging the engagement member in a direction in which the engagement member rotationally moves from the engagement position toward the engagement release position, and supported on the support member respectively at symmetrical positions that are on both sides of the engagement member in a rotational axis direction of the engagement member.

Abstract: The transmission includes a case, a rotation shaft rotatably supported on the case, a speed change gear rotatably supported on the rotation shaft, fork shaft movable in an axial direction in response to the shift operation, a connecting member for changing over a connection condition of the speed change gear between a connected condition with the rotation shaft and a disconnected condition from the rotation shaft in response to an axial position of the fork shaft, a parking gear fixed to the rotation shaft, a detent member movable between a detent position where the rotation of the parking gear is restricted and a detent released position where the rotation of the parking gear is allowed and a cam member for moving the detent member to the detent position or to the detent released position in response to the axial position of the fork shaft.

Abstract: In an automatic dual-clutch transmission, a lowest speed driven gear, other driven gears and a reverse gear are provided on a first output shaft to be freely rotatable. A 2nd speed driven gear and a highest speed driven gear are provided on a second output shaft to be freely rotatable. Further, the 2nd speed driven gear is provided with a large-diameter gear meshing with a 2nd speed drive gear and a small-diameter gear provided bodily with the large-diameter gear, being fewer in tooth number and smaller in diameter than the large-diameter gear, and meshing with the reverse gear. Thus, the automatic dual-clutch transmission is reduced in diameter by not having an output shaft dedicated to the reverse gear and is able to set the gear ratio for reverse to be large.

Abstract: In a transmission, a lubrication oil retention section is formed to surround an area around a circumferential part of a first gear that ranges from a lubrication oil storage region to the outside of the lubrication oil storage region. In the lubrication oil retention section, the lubrication oil scooped up by the rotation of the first gear is retained between the lubrication oil retention section and the first gear at the outside of the lubrication oil storage region. The lubrication oil retention section enables the first gear to splash the lubrication oil retained at the outside of the lubrication oil storage region, toward a receiver that flows the lubrication oil to various sliding parts of the transmission.

Abstract: In a transmission, a large-diameter gear included in a plurality of gears on rotatable shaft members is soaked at its lower part in lubrication oil contained in a lubrication oil storage region formed at a lower portion of a case and scoops up the lubrication oil when rotated. A receiver extending in the axial direction of the large-diameter gear collects the scooped-up lubrication oil and flows the collected lubrication oil toward lubrication portions. The receiver has a vertical wall which enables the lubrication oil scooped up and splashing above the receiver to collide therewith, to flow down on a surface thereof and to be introduced to a collecting portion of the receiver, and an introducing portion which enables the lubrication oil splashing toward between the receiver and the large-diameter gear to flow on a surface thereof and to be introduced to the collecting portion by the inertia force thereof.

Abstract: In an automatic dual-clutch transmission, a lowest speed driven gear, other driven gears and a reverse gear are provided on a first output shaft to be freely rotatable. A 2nd speed driven gear and a highest speed driven gear are provided on a second output shaft to be freely rotatable. Further, the 2nd speed driven gear is provided with a large-diameter gear meshing with a 2nd speed drive gear and a small-diameter gear provided bodily with the large-diameter gear, being fewer in tooth number and smaller in diameter than the large-diameter gear, and meshing with the reverse gear. Thus, the automatic dual-clutch transmission is reduced in diameter by not having an output shaft dedicated to the reverse gear and is able to set the gear ratio for reverse to be large.

Abstract: A transmission for a vehicle is provided with a plurality of gears supported on shaft members rotatably supported in a case to extend in an axial direction, first and second large-diameter gears soaked at lower parts thereof in lubrication oil stored in a lubrication oil storage region formed at a lower portion of the case for scooping upward lubrication oil during rotations, and first and second receivers arranged to extend in the axial direction of the shaft members for collecting the upwardly scooped lubrication oils to supply the same to parts to be lubricated. The first and large-diameter gears are arranged respectively on one and the other end sides of the plurality of gears in the axial direction. Other gears of the plurality of gears except for the first and second large-diameter gears are formed to diameters that hardly agitate the lubrication oil in the lubrication oil storage region.

Abstract: A shifting device for a dual clutch transmission, the dual clutch transmission including a first input shaft, a second input shaft, a counter shaft, a dual clutch, a first gear change mechanism including at least a first gear train and a first switching clutch, and a second gear change mechanism including at least a second gear train and a second switching clutch, the shifting device including a shift mechanism constituted by a first shifter that includes a first follower pin and a first shift fork, a second shifter that includes a second follower pin and a second shift fork, and a cam member at which a single cam groove is formed, and the first and second follower pins engaging with different positions on the cam groove from each other and operating the first and second switching clutches to be associated with each other.

Abstract: A shift actuator assembly includes a plurality of actuators each having a worm rotated by an electric motor and a worm wheel meshing with the worm and rotated corresponding to a rotation of the worm and the each worm wheel of the each actuator being rotated for operating each of a plurality of shift members so as to move independently, wherein the each worm wheel of the each actuator is arranged so as to be coaxial and overlap each other.

Abstract: A shift apparatus of an axially moving shaft includes a worm wheel engaging with a worm shaft, an electric motor driving the worm wheel, and an axially moving shaft including a rack engaging with a pinion fixed to the worm wheel for moving the axially moving shaft in first and second directions, a movement of the axially moving shaft in at least one of the first direction and the second direction is stopped by a portion of the axially moving shaft making contact with a portion of the casing, the worm shaft of which both axial ends are supported by the casing to be rotatable and axially movable, the worm shaft being biased by a spring in at least one of the first direction and the second direction and elastically retained at a position within an operating area of the worm shaft in the first direction and the second direction.

Abstract: A lubricating oil supply device includes a casing including a cylindrical bore and a guide passage whose one end opens to an inside of the casing and whose the other end opens to the cylindrical bore, a rotational shaft including a center bore, an accommodating groove, and a discharge passage which corresponds to the guide passage and whose one end opens to the accommodating groove and whose the other end opens to the center bore, and a lubricating oil guiding member accommodated within the accommodating groove and including a cylindrical portion, a guide hole, which has a first inner side surface connected to an outer circumferential surface of the cylindrical portion so as to form an angle therebtween and a second inner side surface and which is always connected to the discharge passage, and a guide groove extending along the outer circumferential surface of the lubricating oil guiding member.

Abstract: A transmission includes a rotary shaft, a clutch hub fixed to the rotary shaft a transmission gear rotatably provided at the rotary shaft, a gear piece connected to the transmission gear at the side of the clutch hub, a synchronizer ring positioned between the clutch hub and the gear piece, a sleeve held by the clutch hub slidably in an axial direction, a fork engaged with the sleeve and a fork shaft connected with the fork for shifting the fork in the axial direction. The transmission performs synchronization operation of rotation of the clutch hub and the transmission gear. The fork shaft has an in-shaft lubricant passage provided therein, a lubricant supply passage and a lubricant outlet passage.

Abstract: A shifting device for a dual clutch transmission, the dual clutch transmission including a first input shaft, a second input shaft, a counter shaft, a dual clutch, a first gear change mechanism including at least a first gear train and a first switching clutch, and a second gear change mechanism including at least a second gear train and a second switching clutch, the shifting device including a shift mechanism constituted by a first shifter that includes a first follower pin and a first shift fork, a second shifter that includes a second follower pin and a second shift fork, and a cam member at which a single cam groove is formed, and the first and second follower pins engaging with different positions on the cam groove from each other and operating the first and second switching clutches to be associated with each other.