A transmission synchronizer apparatus may include a sleeve coupled to an external peripheral surface of a hub gear while moving axially, and clutch gears disposed at both sides of the hub gear, each selectively synchronizing and engaging with the sleeve according to the axial movement of the sleeve, wherein the transmission synchronizer includes a plurality of main sleeve teeth protruding inwardly from an internal peripheral surface of the sleeve while being distanced from one another, and an auxiliary sleeve tooth protruding inwardly from the internal peripheral surface of the sleeve while protruding from one side of each of the main sleeve teeth to have a height lower than the main sleeve tooth.

A friction element (1, 3) for a frictional shift element for a transmission of a vehicle, the friction element having an annular base body with a plurality of friction surface elements (5), the plurality of friction surface elements (5) protruding radially inwardly or radially outwardly and are distributed over a periphery of the annular base body. The friction element (1, 3) and the plurality of friction surface elements (5) are each formed as one piece.

A transmission gear synchronizer includes a sliding sleeve a hub and a blocker ring. The sliding sleeve has an inner surface defining a sleeve spline. The hub is received within the sliding sleeve. The hub has a plurality of gear teeth extending radially outward from a root diameter of the hub. The plurality of gear teeth are configured to engage the sleeve spine. A notch is disposed proximate the root diameter of the hub and spaced apart from the plurality of gear teeth. The blocker ring comprises a thermoplastic material. The blocker ring comprises a thermoplastic material. The blocker ring has a plurality of molded clutch teeth extending radially outward from a root diameter of the blocker ring. The plurality of molded clutch teeth are configured to engage the sleeve spline in response to the sliding sleeve engaging the blocker ring during a transmission shift event.

A compound transmission shift mechanism is disclosed. The shift mechanism includes a plurality of gears configured on at least one transmission shaft with at least one synchronizer configured to engage at least two of the plurality of gears. The shift mechanism includes a control system configured to engage and position the synchronizer into alignment with the at least two of the plurality of gears. Additionally, the shift mechanism includes at least one damping assembly configured on the control system and operatively connected to the synchronizer.

A transmission gear synchronizer may include a sliding sleeve, a hub configured to be received within the sliding sleeve, and a blocker ring disposed adjacent the hub. The blocker ring may have a plurality of molded clutch teeth and a plurality of molded grooves extending axially along an inner surface of the blocker ring.

A synchronization device for a manual transmission of a vehicle, including a synchronizer ring configured to synchronize rotation of a transmission gear and clutch hub. The synchronizer ring includes: a ring body having an annular shape; an axial protruding portion protruding from the ring body toward the clutch hub in an axial direction to set a size of an axial clearance between the ring body and the clutch hub; and a radial protruding portion protruding from the ring body toward the clutch hub in a radial direction intersecting the axial direction to set a size of a radial clearance to be formed between the ring body and the clutch hub. The ring body, the axial protruding portion, and the radial protruding portion are formed integrally by metal stamping.

A dog clutch for an automatic transmission includes a mating clutch that defines a plurality of helical splines and a sliding clutch that defines a plurality of helical splines. The helical splines of the sliding clutch mesh with the helical splines of the mating clutch in an engaged configuration. The dog clutch also includes a synchronizer positioned at the sliding clutch. A related automatic transmission is also provided.

A synchronizing device for a manual transmission has a sliding sleeve (112) which includes an internal toothing with a plurality of sliding sleeve teeth (118), and a clutch body of a gear wheel, which has an external toothing with a plurality of clutch body teeth (120) into which the internal toothing of the sliding sleeve (112) can engage. There is provided a synchronizing unit which can block an axial movement of the sliding sleeve (112), wherein the clutch body teeth (120) are formed without meshing bevel at their axial tooth end (130) close to the sliding sleeve teeth (118). During the shifting operation the speeds of the sliding sleeve (112) and of the clutch body are adapted. There is built up an axial force (F) of the sliding sleeve against the clutch body and a speed difference between the sliding sleeve (112) and the clutch body is produced, so that the end faces (136, 134) of the sliding sleeve teeth (118) and the clutch body teeth (120) slide along each other, and the sliding sleeve teeth (118) finally are meshed between the clutch body teeth (120).

A method and apparatus for producing clutch bodies, which are suitable for synchronizer systems and provided with teeth or tooth sections, from a blank uses and includes at least one embossing stage, composed of embossing segments and an anvil, for embossing roofs and troughs between root and tip circles into an upper face of the blank, and transfer means for transporting the blanks, First embossing segments form a first section and second embossing segments form a second section for sequential embossing within the at least one embossing stage, wherein the first embossing segments first emboss a first section, then return in relation to the second embossing segments, and thereafter the second embossing segments emboss the second section, wherein the second embossing segments are disposed next to each other in an annular arrangement, and the second embossing segments are designed to be axially movable relative to the first embossing segments of the first section.

The present disclosure provides a method and device for controlling shifting of an automated manual transmission. The method includes: a shifting-attempting step of attempting to shift to a desired transmission gear by axially moving a clutch unit in a transmission to the desired transmission gear; a rotating step of rotating the clutch unit within a predetermined rotation section by rotating a shaft when the clutch unit fails to engage with the desired transmission gear in the shifting-attempting step; and a re-shifting-attempting step of reattempting to shift to the desired transmission gear by axially moving the clutch unit to the desired transmission gear.