A lay-shaft assembly for use in a vehicle transmission includes a clutching mechanism with a synchronization assembly arranged for synchronizing rotation of a driven gearwheel with a first gearwheel or a second gearwheel. The first and second gearwheels extend adjacently with respect to each other along the central axis, and the synchronizing assembly is positioned between adjacent respective outer circumferential surfaces of the adjacent first and second gearwheels and the sleeve. A ring-shaped biasing means support and a complementary biasing means insert for placing onto the ring shaped biasing means support.

A synchronizer is provided for torsionally connecting a gear to an axially aligned shaft. The synchronizer includes a hub connected with the shaft, a sleeve having an inner diameter with spline teeth for torsional connection with the hub being axially movable upon the hub, a blocking ring torsionally connected on the hub having an angular lost motion relationship with the sleeve, the blocking ring having at least a first annular conical friction surface orientated radially inward and axially toward the hub and a second annular conical friction surface oriented radially inward and axially outward from the hub, the blocking ring having blocking cogs preventing axial movement of the sleeve toward the gear when the gear is in a non-synchronous condition, and an engagement ring for fixed connection with the gear, the engagement ring having a complementary annular conical friction surfaces.

A synchronizer mechanism for synchronizing the rotation of gears between a power input shaft and a power output shaft in a manual transmission includes a hub and a synchronizer sleeve disposed about the hub and moveable relative thereto into and out of engagement with adjacent gears to synchronize the rotation of the adjacent gears with the rotation of the power input shaft. An indexing mechanism is employed for indexing the synchronizer sleeve into and out of engagement with adjacent gears. The indexing mechanism includes a retaining mechanism and a detent portion having a main synchronization detent and at least one second synchronization detent disposed laterally adjacent the main synchronization detent. The main synchronization detent causes an intermediate clutch ring to contact a cylindrical cone portion on a gear and begin the change in angular velocity of the gear and to begin the synchronization sequence of the mechanism at a first time. The second synchronization detent causes the intermediate clutch ring to contact a cylindrical cone portion on a gear and change the angular velocity of the gear and synchronizer mechanism at a second time reducing the minor speed difference between the gear and synchronizer sleeve caused by loss of synchronization between the time of sleeve and ring indexing and initial engagement contact of the sleeve to the clutch teeth of the gear.

A transmission device includes a first rotating member and a ring for synchronizing the first rotating member and a second rotating member relative to each other. The first rotating member is provided with a plurality of first recesses for receiving a plurality of protrusions provided on the synchronizing ring. The first rotating member has one said first recess for each of said protrusions. The first rotating member is provided with one or more second recesses making the total number of first and second recesses exceeding the number of said protrusions.

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).

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 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, causing a friction surface of the blocking ring and a mating friction surface of the clutch body to come into contact. The blocking ring switches over in the circumferential direction into one of two possible locking positions, locking the sliding sleeve.

A synchronizer assembly includes a pair of engageable members each including an exterior cone surface and first exterior splines. A central synchronizer ring is disposed between the pair of engageable members and having second exterior splines. A pair of synchronizer cone rings are disposed on opposite sides of the central synchronizer ring and each include third exterior splines and an interior cone surface that oppose the exterior cone surface of respective ones of the pair of engageable members. A sliding synchronizer sleeve engages the second exterior splines of the central synchronizer ring and movable for engaging the third exterior splines of the pair of synchronizer cone rings and the first exterior splines of the pair of engageable members. A plurality of interlocking clips engage the pair of synchronizer cone rings.

A method for motion control of a shift sleeve in a stepped gear transmission during a synchronization and gear engagement sequence for avoiding gear teeth interference, wherein the stepped gear transmission includes an axially displaceable shift sleeve arranged on and rotationally secured to a shaft, and a constant mesh gear wheel arranged on and rotatable relative to said shaft.

A synchronizer assembly includes a pair of engageable members each including an exterior cone surface and first exterior splines. A central synchronizer ring is disposed between the pair of engageable members and having second exterior splines. A pair of synchronizer cone rings are disposed on opposite sides of the central synchronizer ring and each include third exterior splines and an interior cone surface that oppose the exterior cone surface of respective ones of the pair of engageable members. A sliding synchronizer sleeve engages the second exterior splines of the central synchronizer ring and movable for engaging the third exterior splines of the pair of synchronizer cone rings and the first exterior splines of the pair of engageable members. A plurality of interlocking clips engage the pair of synchronizer cone rings.

A charging mechanism charges a stored-energy spring of a stored-energy spring mechanism. The charging mechanism contains a charging gear coupled to the stored-energy spring, an intermediate shaft coupled to the charging gear, an idler gear driven by a charging motor, a freewheel coupled to the idler gear, and a dog clutch that couples the freewheel to the intermediate shaft to charge the stored-energy spring and uncouples same from the intermediate shaft in the charged state. The dog clutch contains a first clutch block that is non-rotatably coupled to the intermediate shaft, a second clutch block connected to the freewheel, and a synchronizer ring arranged between the clutch blocks and is non-rotatably coupled to the first clutch block. During a rotation relative to the second clutch block, the synchronizer ring couples in a form-fitting manner to the second clutch block in a first direction of rotation about the axis of rotation.