Abstract: In a double-clutch transmission, a clutch of an input shaft which is not synchronously rotated with a output shaft is connected to synchronize the speed of rotation of the input shaft with that of the engine, and the rotational speed of the input shaft is measured to thereby detect a engine rotational speed.

Abstract: A synchromesh automatic transmission includes a lug lock portion which is engaged with a shift lug separately from a shift finger and enables a shift fork to be controlled so as to be located at a neutral position, a shift selector mechanism which achieves a target shift stage by engaging the shift finger with the shift lug of the shift fork corresponding to the target shift stage and displacing this shift fork in a shift direction, and an interlock mechanism which controls a shift fork that is different from the target shift stage so as to be located at a neutral position by displacing the lug lock portion following movement of the shift finger in a selection direction and engaging this lug lock portion with the shift lug of the shift fork that is different from the target shift stage.

Abstract: An input system includes an input shaft portion, including a first and second input shafts, bearings, rotatably supporting the input shaft portion; and clutches, for transmitting rotational power to the first or second input shafts. An output system includes a first and second output shafts, and a plurality of driven gearwheels, which mesh with drive gearwheels of the first and second input shafts. Driven gearwheels for low gears disposed on the second output shaft are submerged in lubricating oil in an oil reservoir provided below the second output shaft. Drive gearwheels for low gears are disposed adjacent to the bearings. Tooth width dimensions of the drive gearwheels for the low gears are larger than tooth width dimensions of the driven gearwheels for the low gears. Exposed tooth width portions of the drive gearwheels constitute oil splashing portions which splash lubricating oil splashed by the driven gearwheels on to the bearings.

Abstract: In a double-clutch transmission, a clutch of an input shaft which is not synchronously rotated with a output shaft is connected to synchronize the speed of rotation of the input shaft with that of the engine, and the rotational speed of the input shaft is measured to thereby detect a engine rotational speed.

Abstract: A synchromesh automatic transmission includes a lug lock portion which is engaged with a shift lug separately from a shift finger and enables a shift fork to be controlled so as to be located at a neutral position, a shift selector mechanism which achieves a target shift stage by engaging the shift finger with the shift lug of the shift fork corresponding to the target shift stage and displacing this shift fork in a shift direction, and an interlock mechanism which controls a shift fork that is different from the target shift stage so as to be located at a neutral position by displacing the lug lock portion following movement of the shift finger in a selection direction and engaging this lug lock portion with the shift lug of the shift fork that is different from the target shift stage.

Abstract: An input system includes a first input shaft provided with forward drive gearwheels of one gear group of two predetermined gear, a second input shaft provided with forward drive gearwheels of the other gear group and being rotatable about an axial center of the first input shaft, and clutches provided at end portions of the first and second input shafts. An output system includes first and second output shafts provided parallel to the first and second input shafts, a forward gear mechanism including forward driven gearwheels provided on the first and second output shafts meshing with the forward drive gearwheels and synchromesh mechanisms, and a reverse gear mechanism including a reverse driven gearwheel, a synchromesh mechanism, and an idler gearwheel being rotatable together with a forward driven gearwheel for a low gear meshing with the reverse driven gearwheel.

Abstract: An input system includes an input shaft portion, including a first input shaft and a second input shaft, which is rotatably fitted on an outer circumferential surface of the first input shaft; bearings, rotatably supporting the input shaft portion; and clutches, provided at the first and second input shafts, respectively, for transmitting rotational power of an engine to the first or second input shafts. An output system includes a first output shaft and a second output shaft, a plurality of driven gearwheels, which mesh with drive gearwheels of the first and second input shafts, and synchromesh mechanisms. An oil reservoir is provided below the second output shaft for reserving lubricating oil in such an amount that driven gearwheels for low gears which are disposed on the second output shaft are submerged therein. Drive gearwheels for low gears are disposed adjacent to the bearings, respectively.

Abstract: Outermost fork shafts are provided adjacent to shift lugs thereof with arms which have free end faces opposing each other. The arms prevent the shift lugs from moving apart from their adjacent shift lug, thereby making it possible to prevent a control finger from accidentally entering between adjacent shift lugs.