Systems and method for a two-way clutch are provided. In some configurations, the two-way clutch includes a driven member having a first mating surface, a drive member having a second mating surface, and a locking mechanism arranged between the first mating surface and the second mating surface. The locking mechanism is operable to contact the first mating surface and the second mating surface, in response to an outside force applied to the drive member that loads the locking mechanism. The two-way clutch further includes an engaging member. The engaging member provides a predetermined interference on the locking mechanism to hold the locking mechanism off of at least one of the first mating surface and the second mating surface, when the locking mechanism is in an unloaded state.

In a claw-type gearshift, a blocking ring is arranged axially between a hub body having a sliding sleeve and a clutch body such that it is rotatable between a release position and two locking positions. The blocking ring is adapted to be displaced toward the clutch body until conical friction surfaces on the blocking ring and on the clutch body come into contact. The blocking ring constitutes a form-locking blockade for the sliding sleeve against displacement of the sliding sleeve teeth between the clutch body teeth when an axial shifting force is applied in the non-synchronized state. When the claw clutch is shifted, a difference in speed between the clutch body and the hub body is reduced and the sliding sleeve is deflected in the axial direction toward the speed change gear to be shifted, as a result of which a friction surface of the blocking ring and a mating friction surface of the clutch body come into contact.

A method for shifting a gear in a synchronizer comprising a synchronizer body arranged on a transmission shaft, a first and a second synchronizer associated to a first and a second transmission gear, wherein the synchronizer has a sliding sleeve and at least one thrust piece which is shiftably arranged on the synchronizer body and can exert an axial compressive force on the corresponding synchronizer ring. The synchronizer includes an elastic actuating element active between the sliding sleeve and the thrust piece, and the sliding sleeve has a detent recess for the neutral position and a release contour that can cooperate with the actuating element such that when the sliding sleeve is shifted for being engaged with one of the transmission gears, the thrust piece is urged away from the corresponding synchronizer ring.

A synchronizer of a transmission may include a lower key disposed slidable in a radial direction of a hub; an upper key disposed at an external side of the lower key in the radial direction to be slidable in an axial direction of the hub; a sleeve disposed at an external side of the hub to slide the upper key in the axial direction while being slid in the axial direction thereof, pressing the upper key toward a synchronizer ring; a key spring disposed between the lower key and the hub to press the lower key and the upper key toward an internal surface of the sleeve; and a displacement converting device converting relative displacement generated in a circumferential direction of the hub between the upper key and the lower key into relative displacement of the upper key in axial direction toward the synchronizer ring with respect to the lower key.

A synchronizer (10) for a gear transmission has a synchronizer body (12), which is associated to a transmission shaft, and a first and a second synchronizer ring (32, 34, 36, 38) which are associated to a first and a second transmission gear (28, 30). Furthermore, the synchronizer (10) has a sliding sleeve (26) and at least one thrust piece (18) which is shiftably arranged on the synchronizer body (12) and can exert an axial compressive force on the corresponding synchronizer ring (32, 34, 36, 38). Furthermore, the synchronizer (10) includes an elastic actuating element (20) which is active between the sliding sleeve (26) and the thrust piece (18), wherein on the sliding sleeve (26) a detent recess (50) for the neutral position as well as a release contour (54) are provided. The release contour (54) can cooperate with the actuating element (20) such that when the sliding sleeve (26) is shifted for being engaged with one of the transmission gears (28, 30), the thrust piece (18) is urged away from the corresponding synchronizer ring (32, 34, 36, 38). The release contour (54) has an axial length which is not more than twice the idle stroke of the sliding sleeve (26) between the neutral position and the position in which the corresponding synchronizer ring (32, 34, 36, 38) presses against an associated friction surface.

An engagement device (1) for a transmission (G), the engagement device (1) including a gear shift sleeve (S) arranged between a first idler gear (LR1) associated with a shaft (W) of the transmission (G) and a second idler gear (LR2) arranged coaxially to the shaft (W). By displacing the gear shift sleeve (S) towards the first idler gear (LR1), a rotationally fixed connection between the shaft (W) and the first idler gear (LR1) can be established. By displacing the gear shift sleeve (S) towards the second idler gear (LR2), a rotationally fixed connection between the first idler gear (LR1) and the second idler gear (LR2) can be established. The first idler gear (LR1) includes a plurality of axially projecting extensions (F) which extend through openings (A) formed in the gear shift sleeve (S).

A radially applied dog clutch for a vehicle transmission. The clutch includes a driving member configured to rotate about an axis and including a cavity extending radially from the axis, a driving tooth slidably movable within the radially extending cavity, a driven member coaxially surrounding the driving member and including a radially inward extending driven tooth, and a synchronizer coaxially positioned between the driving member and the driven member.

A synchronizer of a transmission is provided. The synchronizer includes a lower key that is installed to be slidable with respect to a hub in a radial direction of the hub and an upper key that is installed on an exterior of the lower key, the upper key being slidable in an axial direction of the hub. Additionally, a sleeve is installed at an exterior of the hub to slide the upper key in the axial direction while the sleeve slides in the axial direction, to pressurize the upper key toward a synchro ring. A key spring installed between the lower key and the hub to pressurize the lower key and the upper key toward an inner surface of the sleeve.

A synchronizer of a transmission may include bottom key disposed on a hub to be slidable in a radial direction of the hub; a top key disposed radially outside the bottom key to be slidable in an axial direction of the hub; a sleeve disposed outside the hub and sliding in the axial direction to slide the top key in the axial direction to press a synchro-ring; a key spring disposed between the bottom key and the hub to press the bottom key and the top key toward an internal side of the sleeve; and a motion converting portion converting relative motion generated in a circumferential direction of the hub between the top key and the bottom key into axial relative motion of the top key to the bottom key toward the synchro-ring.

A dog clutch for a vehicle transmission includes a driving member configured to rotate about an axis and including a cavity extending radially from the axis, a driving tooth slidably movable within the radially extending cavity, a driven member coaxially surrounding the driving member and including a radially inward extending driven tooth axially aligned with the driving tooth, an actuator shaft coaxially positioned within the driving member and movable along the axis, a retainer on the actuator shaft, a bullet actuator coaxially mounted on the actuator shaft, and a biasing member coaxially mounted on the actuator shaft and positioned between the bullet actuator and the retainer.