A control apparatus for a vehicle drive-force transmitting apparatus including a dog clutch that is operated by an actuator to selectively connect and disconnect a drive-force transmitting path. In process of switching of the dog clutch from released state to engaged state, the control apparatus determines whether a rotational speed difference of the dog clutch is equal to or larger than a given difference value when a sleeve of the dog clutch is positioned on an engaging side of a synchronizing position for placing the dog clutch into the engaged state, and stops the switching of the dog clutch to the engaged state and causes the actuator to place the dog clutch back into the released state, when determining that the rotational speed difference is equal to or larger than the given difference value with the sleeve being positioned on the engaging side of the synchronizing position.

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 power transmission apparatus includes a first meshing engagement mechanism that selectively couples a first rotational section and a second rotational section; and a second meshing engagement mechanism that selectively couples a third rotational section and a fourth rotational section. The first meshing engagement mechanism includes a first movable member provided with third meshing teeth that mesh with first meshing teeth provided on one of the first and the second rotational sections. The second meshing engagement mechanism includes a second movable member provided with fourth meshing teeth that mesh with second meshing teeth provided on one of the third and the fourth rotational sections. At least a portion of a first movable region of the third meshing teeth and at least a portion of a second movable region of the fourth meshing teeth overlap with each other in a radial direction with respect to a rotational axis.

An automotive synchronizer slider assembly includes a slider body with two connecting grooves symmetrically arranged thereon. The slider body has a top, a bottom, and a middle. A first boss and a second boss are provided on the top of the slider body. The first boss and the second boss have mounting grooves for a steel ball, and the first boss has provided on a top thereof two or more clips. Pressure plates are provided at the bottom of the slider body. A mounting part has a top and a bottom, and a spring mounting hole positioned between the top and the bottom. The top of the mounting part is connected to the second boss, and the bottom of the mounting part has a hole therein. A steel ball is mounted in the mounting grooves and retained in the slider body by the two clips. A fastening spring having a top and a bottom is mounted in the spring mounting hole. The bottom of the fastening spring abuts the bottom of the mounting part proximate the hole therein, and the top of the fastening spring abuts the steel ball.

Clutch device with a dog clutch having inner toothing of a sliding sleeve which is displaceable as part of the dog clutch between a clutch body and the hub of an idler wheel along the outer teeth of the clutch body and the outer toothing of the hub for coupling and decoupling. The inner toothing of the sliding sleeve can be produced comparatively simply compared to the prior art and results in a reduced installation space.

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 transmission includes a primary gear including primary teeth, each having a primary surface; a secondary gear including secondary teeth; an intermediate gear including intermediate teeth, each comprising a primary intermediate part having a primary intermediate surface and a secondary intermediate part having a secondary intermediate surface, where the primary intermediate part is axially offset from the secondary intermediate part. The intermediate gear is axially displaceable to an engaged position. The primary surface contacts the primary intermediate surface in a contact region and the secondary intermediate surface contacts one of the secondary teeth. In the engaged position, one primary tooth and one intermediate tooth form an overlap, radially inside the contact region, for preventing the intermediate gear from being displaced from the engaged position to a disengaged position.

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.