Abstract: A gear synchronizer assembly includes a clutch sleeve formed at its inner periphery with an internal radial projection, and a radially contractible annular resilient member supported by engagement with the inner circumference of an outer cylindrical hub portion of a hub member fixed to a transmission shaft. The resilient member has an axial leg extending therefrom toward the internal radial projection of the clutch sleeve and having a radial projection which is arranged to be engaged with the internal radial projection in shifting operation of the clutch sleeve toward a spline piece and arranged to abut against and urge a synchronizer ring toward the spline piece upon engagement with the internal radial projection of the clutch sleeve thereby to effect frictional engagement between the synchronizer ring and spline piece.

Abstract: A gear synchronizer mechanism includes a gear member rotatable on a shaft, a hub member arranged adjacent the gear member and fixed to the shaft, and a clutch sleeve encircling an outer cylindrical portion of the hub member. The clutch sleeve is formed at its inner periphery with a plurality of circumferentially spaced radial projections axially movable in the corresponding axial grooves formed in the cylindrical portion of the hub member. A radially contractible C-letter shaped spring is supported in place by engagement with circumferentially spaced inner walls of the cylindrical portion of the hub member. The spring has an intermediate ring portion integrally formed with a plurality of circumferentially spaced axial legs extending therefrom toward the respective radial projections of the clutch sleeve, the axial legs each having a radial projection to be engaged with each of the radial projections of the clutch sleeve.

Abstract: In a gear synchronizer assembly of the well-known type, a clutch sleeve is formed at its inner periphery with at least one first internal radial projection of large width and a pair of circumferentially spaced second internal radial projections of small width arranged at opposite sides of the first internal radial projection, a synchronizer ring being formed thereon with a pair of raised portions to be engaged with the first internal radial projection and another pair of raised portions to be engaged with the second internal radial projections. A thrust mechanism comprising a radially contractible annular spring is supported in place by engagement with the inner circumference of a cylindrical hub portion of a hub member fixed to a transmission shaft.

Abstract: In a gear synchronizer assembly of the well-known type, an internal splined portion of a clutch sleeve includes first internal splines engageable with external splines of a synchronizer ring and second internal splines engageable with external splines of a spline piece. The first internal splines of the clutch sleeve are formed smaller in axial length than the second internal splines of the clutch sleeve to reduce the shift stroke of the clutch sleeve as short as possible and to avoid increase of relative rotation between the clutch sleeve and the spline piece.

Abstract: In a gear synchronizer assembly of the well-known type, a clutch sleeve is formed at its inner periphery with an internal radial projection, and a thrust mechanism comprises a radially contractible annular resilient member supported in place by engagement with the inner circumference of an outer cylindrical hub portion of a hub member fixed to a transmission shaft. The resilient member has an axial leg extending therefrom toward the internal radial projection of the clutch sleeve and having a radial projection which is arranged to be engaged with the internal radial projection in shifting operation of the clutch sleeve toward a spline piece integral with a change-speed gear and arranged to abut against and urge a synchronizer ring toward the spline piece upon engagement with the internal radial projection.

Abstract: In a change-speed gearing unit, a manual shift lever is mounted at its lower end on a retainer casing which is secured at its outer peripheral portion to the upper seating face of an extension housing for the unit by means of fastening bolts threaded into the housing with intervention of an oil buffer member of elastic material between the outer peripheral portion of the casing and the upper seating face of the housing. A first plurality of fastening bolts adjacent to the lower end of the shift lever are directly engaged with the outer peripheral portion of the retainer casing to prevent floating of the casing, and a second plurality of fastening bolts are engaged respectively through a plurality of elastic members with the outer peripheral portion of the casing such that the casing is floatably secured in place due to resiliency of the oil buffer member.

Abstract: A gear assembly for automobile transmissions includes a pair of driving and driven gears permanently in meshing engagement with each other to provide a torque transmission therebetween, and an additional gear relatively rotatable at one side of either one of the gears and being permanently in meshing engagement with the other gear to rotate at a gear ratio different from that of the driving and driven gears, and in which the additional gear is resiliently in contact with one end face of the gear adjacent thereto to restrain a relative rotation between the driving and driven gears. The toothed portion of the gear adjacent to the additional gear is formed at one end thereof with an annular stepped portion for provision of a predetermined annular gap between the additional gear and one end of the toothed portion of the gear.

Abstract: A gear assembly for an automobile gear transmission includes a pair of driving and driven gears permanently in meshing engagement with each other, an additional gear axially slidable and rotatable on a hub projection of the driven gear and being permanently in meshing engagement with the driving gear to rotate at a gear ratio different from that of the driving and driven gears, a synchronizer mechanism assembled adjacent to the additional gear and having a spline piece fixed to the hub projection, and a compression spring in surrounding relationship with the hub projection and being engaged at its one end with the additional gear and at its other end with the spline piece to be positioned in place without provision of a conventional snap ring.

Abstract: A gear wheel assembly in a gear transmission, in which a gear wheel mounted in position on a shaft is formed at its hub portion with an axial stepped bore, which includes a first inner spline portion of large diameter and a second inner spline portion of small diameter, and the shaft is formed axially in sequence with a cylindrical portion engaged with the second inner spline portion of the gear wheel with a press fit, a first outer spline portion slidably engaged with the first inner spline portion of the gear wheel, and a second outer spline portion engaged with the first inner spline portion of the gear wheel with a press fit.

Abstract: A shift mechanism in a manual transmission which may reduce an inertial revolution of a counter shaft system by applying to it a dragging resistance or a frictional force before reverse gears are meshed with each other during a reverse shifting operation to prevent a gear buzzing or a body shock, and may permit the reverse shifting operation to be smoothly carried out by releasing the dragging resistance from the counter shaft system upon completion of the reverse shifting operation.

Abstract: A synchronizing device for a transmission including a shift interlocking mechanism having play of a predetermined distance wherein adjacent fork shafts are simultaneously actuated when reverse shift is effected, so that synchronization with the rotation of an output shaft can be obtained by using a synchronizing device of the forward stage. Synchronization can be achieved readily when reverse shift is effected and shifting can be done smoothly without producing noise.

Abstract: An overdrive device for motor vehicle transmissions includes a sun gear, planet pinions and a ring gear in meshing relationship. A one-way clutch having an inner race integrally secured to the sun gear is provided with the outer race of the one-way clutch being spline-coupled to a carrier which rotatably supports the planet pinions. A certain degree of slack or looseness is provided between the carrier and the outer race to permit some relative movement therebetween in the radial direction of the overdrive device.

Abstract: In a change-speed gearing unit including an extension housing formed at its rear end portion with an upright projection located in the upper opening of the housing, and a shift-and-select lever shaft slidably and rotatably supported at its rear end portion by an axial bearing hole in the upright projection, a lubricating device comprises a pair of laterally upright walls formed on the rear end portion of the housing between both faces of the upright projection and both opposed inner walls of the upper opening portion of the housing to form an oil well in open communication with the axial bearing hole, the oil well being supplied with lubricating oil picked up by the rearmost gears of the change-speed gearing unit.

Abstract: A gear-teeth protector for a change-speed gearing unit in which a pair of upper and lower change-speed gears of high meshing rate and arranged adjacent to an upright wall in a housing for the gearing unit. The gear-teeth protector comprises a shroud plate secured to the upright wall at one side of the change-speed gears to enclose the meshing engagement portion of the gears in forward operation of the gearing unit, the shroud plate being in the form of a side wall extending adjacent to the lower teeth portion of the upper change-speed gear and to the upper teeth portion of the lower change-speed gear.

Abstract: A fluid pressure control device for an automatic transmission of an automotive vehicle, wherein throttle pressure and governor pressure control valves produce a throttle pressure and a governor pressure from a line pressure, while several shift valves produce selectively, according to the balance of the throttle pressure and the governor pressure, pressures for actuating several friction engaging devices which provide several speed stages of the transmission. However, the shift valve which controls switching between the highest and the next to the highest speed stages is electrically controlled in its kick down throttle opening and high speed region, so that in this region the upshift and the downshift lines are both largely biased to the higher vehicle speed, depending upon a throttle opening sensor, a vehicle speed sensor, and an electrical computing device.

Abstract: A lubrication mechanism in a change-speed gearing unit in which an oil transfer trough is suspended in a fore-and-aft direction at one side of the inner wall of an extension housing secured at its front end to a transmission casing. The trough is fixed at its front end to the upper portion of the extension housing in such a way as to open toward the upper interior space of the transmission casing and fixed at its rear end to the rear portion of the side wall of the extension housing by means of a hollow bush of elastic material which is pressedly mounted within an axial groove in the rear portion of the side wall of the extension housing. The hollow bush is formed with a closed tubular portion coupled over the rear end of the trough and an outlet portion laterally extending from the tubular portion and opening toward the interior space above an oil well in the extension housing.

Abstract: A hydraulic control system for an automatic transmission including a fluid coupling type torque converter, and a gear system provided with two or more frictional devices adapted to establish two or more speed conditions.

Abstract: In an automatic transmission for vehicles which has a fluid torque converter, a lock-up clutch for directly connecting the input and output members of the torque converter when pressure is supplied to its pressure chamber, and a gear transmission mechanism which has several hydraulic fluid actuated friction engaging devices for providing several speed stages: a control system which provides selective supply of pressures for actuating the friction engaging devices, which includes a system for manually selecting any of several desired shift ranges, several shift valves for selectively providing actuating pressures for the friction engaging devices according to the shift range selected by the manual selecting system and according to the balance between the opening of the intake throttle valve of the engine of the vehicle and its road speed, and a system for supplying pressure to the pressure chamber of the torque converter, when any one of several shift ranges is selected by the manual selecting device, only whe

Abstract: A fastening arrangement for removably securing a gear or hub to a shaft by means of a spring wire clip which clip includes a curved portion formed by radially and circumferentially bending an intermediate portion of the clip for resilient engagement with an axial groove formed in a central bore of the gear, a pair of loop portions extending from opposite ends of the curved intermediate portion and arranged to be fitted around the shaft for engagement with either side surface of the gear, and a pair of detent pin portions formed by radially inwardly bending the end of each of the loop portions for engagement with a pair of radial holes formed in the shaft.

Abstract: A die-cast transmission extension housing has an outer peripheral wall or whell and an integral bearing supporting partition wall provided transversely of the longitudinal axis of the shell between the open forward end and the closed rear end thereof. The partition wall supports at least a bearing for the transmission output shaft extending through the open forward end, the bearing on the partition wall and the closed end. The inner surfaces of the shell forwardly of the rear surface of the partition diverge to the open end of the shell so that the inner space defined by these inner surfaces and the partition can be moulded by a die-casting mould part which is slidable out of the inner space through the open end of the shell after the extension housing is die-cast. The upper wall of the extension housing is formed therein with an upper opening adapted to be closed by a shift lever retainer.