Abstract: A synchromesh mechanism includes a shaft, a shift sleeve, a first gear and a second gear arranged at the both sides of a hub, and a first synchronizer ring and a second synchronizer ring arranged at the both side of the hub. The shift sleeve has a length so that it can start contacting with the first synchronizer ring and the second synchronizer ring at the same time.

Abstract: A transmission includes a first power transmitting path of gears that obtains odd number speeds and has an output part, a second power transmitting path of gears that obtains even number speeds and has an output part; a first gear shifting part incorporated in the first power transmitting path to obtain one of the odd number speeds, a second gear shafting part incorporated in the second power transmitting path to obtain one of the even number speeds, and a path shifting part that is arranged between the first and second power transmitting parts. The path shifting part shifts the first second power transmitting paths to output power to the output shaft.

Abstract: A shift device includes an output shaft, a hub, a speed gear, a sleeve, a synchronizer ring, lever members, and a spring. The lever members have torque receiving portions contactable with projections of the synchronizer ring to receive friction torque from the projections. Contact positions of the torque receiving portions and the projections in a synchronization operation are set at a hub side of the lever members and an axial-directional distance between points of support and the contact positions is less than a thickness of the lever member.

Abstract: A shift device has lever members. These top portions engage with cut-off portions of a hub, being inserted in a groove portion of a shift sleeve. Slanted surfaces of the sleeve contact with the top portions to be capable of transmitting axial pressing force on the pressure-receiving surfaces of the ring. Friction torque acts on the members through first projections of the ring. The members has first slide surfaces contactable with first guide surfaces of the hub at both end portions in a rotational direction of the top portions, and second slide surfaces contactable with second guide surfaces of the hub at both end portions of the members.

Abstract: A shift device has thrust pieces to change force in a radial direction to thrust when they swing relative to and contact with a hub. The thrust pieces respectively are fixed with holders each containing a ball and a spring. The springs elastically press the balls outwardly in the radial direction against the groove of the shift sleeve, pressing the radially inner surfaces of the thrust pieces on the guide surfaces of the hub through the holders to be configured in such a way that a clearance between the radially outer surfaces of the thrust pieces and the inner surface of the shift sleeve is ensured and the thrust pieces can swing being guided along the guide surfaces.

Abstract: A shift device has lever members arranged between a sleeve, a hub, and synchronizer rings to amplify and transmit pressing force of the sleeve to one of the synchronizer ring. The lever members include a top portion and arm portions at the both sides of the top portion. The lever members are provided with a torque receiving surface capable of receiving friction torque from projections of the synchronizer rings on an intermediate portion of each arm portion between the top portion and a second slide surface provided on each end of the arm portions.

Abstract: A shift device has lever members arranged between a sleeve, a hub, and synchronizer rings to amplify and transmit pressing force of the sleeve to one of the synchronizer ring. The lever members include first lever members for one of the synchronizer rings, and second lever members for the other of the synchronizers. The first lever members and the second lever members are alternately arranged at the both sides of the hub with a phase shift in a rotational direction.

Abstract: A shift device includes a shaft, a hub, a sleeve, a pair of speed gears sandwiching the hub, a first synchronizer ring, a second synchronizer ring, a plurality of thrust pieces disposed in cut-off portions of the hub and a pair of springs pushing the thrust pieces outwardly in a radial direction toward the sleeve. The thrust pieces move together with the sleeve when the sleeve is moved toward the one of the speed gears, while the thrust pieces moves inwardly in the radial direction against the first and second springs when the sleeve is moved halfway toward the other of the speed gears so that the thrust pieces move in an axial direction and swing to provide different self-servo functions according to the above shift directions when they contact with the hub.

Abstract: A sleeve has splines formed with a groove, a high-speed-stage slanting surface and a turn-off slanting surface. A synchronizer ring has splines and first projecting portions. Lever members are arranged among the sleeve, the hub and the synchronizer ring to transmit pushing force from the sleeve to the synchronizer ring. The synchronizer ring is pushed against a speed gear to generate frictional torque, being pushed by the lever members pressed by a high-speed-stage slanting surface. The lever members turn over and transmit pushing force applied from a turn-over slanting surface to the synchronizer ring so as to press a frictional surface against a cone surface to synchronize them when the sleeve moves in a direction opposite to the speed gear. A diameter of the first inner diameter portion is set larger than that of the second inner diameter portion.

Abstract: A shift device has lever members. These top portions engage with cut-off portions of a hub, being inserted in a groove portion of a shift sleeve. Slanted surfaces of the sleeve contact with the top portions to be capable of transmitting axial pressing force on the pressure-receiving surfaces of the ring. Friction torque acts on the members through first projections of the ring. The members has first slide surfaces contactable with first guide surfaces of the hub at both end portions in a rotational direction of the top portions, and second slide surfaces contactable with second guide surfaces of the hub at both end portions of the members.

Abstract: A gear has a hub with cut-off portions and outer splines as one unit. Thrust pieces are inserted in the cut-off portions for transmitting thrust between a shift sleeve and a synchronizer ring. The gear has a flange portion formed with supporting holes corresponding to the cut-off portions provided with a force-amplifying slope at synchronized member sides thereof. First end portions of the thrust pieces are inserted in the supporting holes. Second end portions thereof are formed with a side end surface for receiving friction torque from the synchronizer ring and with a pressure-receiving slope for transmitting the friction torque to the force-amplifying slope. The thrust pieces swing around centers in the supporting holes so that the second end portions swing in a rotational direction to contact the pressure-receiving slopes with the force-amplifying slopes to change the friction torque to the thrust acting on the synchronizer ring.

Abstract: A synchronizer device includes a first rotating member provided at a shaft, a second rotating member rotatably provided at the shaft and including a conical body on which an outer conical surface is formed, a synchronizer ring having an inner conical surface contacting the outer conical surface, and arranged between the first and the second rotating members, the synchronizer ring being movable in an axial direction of the first rotating member and integrally rotated with the first rotating member, a sleeve provided at an outer circumference of the first rotating member, and the sleeve being slidable in the axial direction of the first rotating member, a lever provided at an inner circumference of the sleeve and arranged between the first rotating member and the synchronizer ring, and a retracting member including an outwardly biasing portion and a retracting biasing portion for biasing the lever away from the synchronizer ring.

Abstract: A shift device includes a hub, a sleeve splined with the hub, and a pair of speed gears sandwiching the hub. Thrust pieces are respectively inserted in the concave portions of the sleeve and movable in the notches of the hub in an axial direction, and formed with slanted surfaces on their outer circumference for contacting with slanted surfaces of the sleeve, and contact with projections of synchronizer rings so that the thrust pieces can move around the projections and push the projections in the axial direction. The thrust pieces are also formed with projecting portions at their four edges, seen from an outside of the hub in a radial direction, the projecting portions being formed with slanted surfaces corresponding to the slanted surfaces of the hub.

Abstract: A shift device includes a hub, a sleeve splined with the hub, a pair of speed gears located at both sides of the hub, and a pair of synchronizer rings arranged between the hub and the speed gears. Thrust pieces are respectively engageable with projections of the sleeve and movable in notch portions of the hub in an axial direction the shift device. The thrust pieces are formed with first slanted surfaces pressable on chamfers of the synchronizer rings and second slanted surfaces contactable with slanted surfaces of the hub. The thrust pieces engage and move together with the sleeve in the axial direction when the first slanted surfaces press the chamfers of the synchronizer ring and are disengaged from the sleeve before the splines of the sleeve and the speed gear are engaged.

Abstract: A multi-speed automatic transmission includes a first planetary gear set and a second planetary gear set, which are arranged in parallel on a first output shaft and a second output shaft, respectively. An input shaft is connectable with a first ring gear through first input drive and driven gears of the input shaft and the first output shaft, being connectable with a second pinion carrier through a second input drive and driven gears of the input shaft and the second output shaft. The first output shaft is connectable with a first pinion carrier, the second output shaft being connectable with a second ring gear. A second pinion carrier is fixable to a transmission case. The first and second sun gears are connectable with the input shaft through the first input drive and driven gears and through the intermediate gear, being fixable to the transmission case.

Abstract: A synchronizer device includes a first rotating member provided at a shaft, a second rotating member rotatably provided at the shaft and including a conical body on which an outer conical surface is formed a synchronizer ring having an inner conical surface contacting the outer conical surface, and arranged between the first and the second rotating members, the synchronizer ring being movable in an axial direction of the first rotating member and integrally rotated with the first rotating member, a sleeve provided at an outer circumference of the first rotating member, and the sleeve being slidable in the axial direction of the first rotating member, a lever provided at an inner circumference of the sleeve and arranged between the first rotating member and the synchronizer ring, and a retracting member including an outwardly biasing portion and a retracting biasing portion for biasing the lever away from the synchronizer ring.

Abstract: A pair of first speed gears (26a, 26b) is provided between a first input shaft (14) and a first output shaft (20), and a pair of fourth speed gears (30a, 30b) is provided between a second input shaft (18) and the first output shaft. A pair of third speed gears (34a, 34b) and a pair of fifth speed gears (36a, 36b) are provided between the first input shaft and a second output shaft (22), and a pair of second speed gears (40a, 40b) and a pair of sixth speed gears (30a, 42b) are provided between the second input shaft and the second output shaft. A backward input gear (34a) integrated with the first input shaft and a backward output gear (46b) provided on the first output shaft are connected to each other via idler gears (46a, 46b) disposed on a sub shaft (24). By this arrangement the length in an axial direction of the transmission is made short.

Abstract: A pair of first speed gears (26a, 26b) is provided between a first input shaft (14) and a first output shaft (20), and a pair of fourth speed gears (30a, 30b) is provided between a second input shaft (18) and the first output shaft. A pair of third speed gears (34a, 34b) and a pair of fifth speed gears (36a, 36b) are provided between the first input shaft and a second output shaft (22), and a pair of second speed gears (40a, 40b) and a pair of sixth speed gears (30a, 42b) are provided between the second input shaft and the second output shaft. A backward input gear (34a) integrated with the first input shaft and a backward output gear (46b) provided on the first output shaft are connected to each other via idler gears (46a, 46b) disposed on a sub shaft (24). By this arrangement the length in an axial direction of the transmission is made short.

Abstract: A booster mechanism is interposed between a hub of a Warner type synchronizing apparatus and a synchronizing ring to boost and transmit a pressure force caused by the movement of a coupling sleeve to a speed change gear side. There is also provided a rearward synchronizing mechanism for stopping the rotation of a drive shaft in such a manner that when the rearward synchronizing mechanism receives a pressure force caused by the reverse shift of the sleeve, it reverses and transmits the pressure force to the synchronizing ring for a synchronizing action, in addition to the booster mechanism on the forward speed change gear.

Abstract: The vibration-free handle comprises a first rod connected to a vibration source via an attachment, a second rod connected to the first rod at one end thereof with a predetermined inclination, a mass body mounted on the other end of the second rod, and an elastic member provided between the first rod and the vibration source for covering the first and second rods. The elastic member possesses spring constants in three directions, one direction being defined by the direction the vibration source vibrates (z-direction) and the other two directions extending perpendicularly to each other in a plane perpendicular to the z-direction. When the second rod, which serves as a grip of the handle, extends perpendicularly to the z-direction and the vibration source starts vibrating, there appear "vibration knots" in the second rod, at which the vibration amplitude is substantially zero, in three directions. The "vibration knots" reduce the vibration from the vibration source.