192 clutches and power-stop control – Clutches – Progressive engagement
Patent
1996-11-19
1999-03-30
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Progressive engagement
192 5334, F16D 2306
Patent
active
058876880
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a synchronizing device for manual transmissions comprising an inner synchronizer ring mounted rotationally fast on a transmission shaft, a peripheral surface of said inner sychronizer ring comprising an outer gearing and a plurality of uniformly spaced longitudinal grooves, an inner gearing of a sliding sleeve meshing with the outer gearing of the inner synchronizer ring, and thrust members engaging into said longitudinal grooves, while a spherical locking element biased by a compression spring and cooperating with a recess of the sliding sleeve projects beyond a radially outer surface of each of the thrust members inserted into the inner synchronizer ring, said thrust members cooperating with at least one outer synchronizer ring provided with a conical friction surface and a locking gear.
A synchronizing device for manual transmissions of the above type is known from DE-B 2613 388. In such a locking-type synchronizing arrangement, the thrust members arranged in the longitudinal grooves of the inner synchronizer ring serve to initiate synchronization during gearshifting i.e., to move an outer synchronizer ring against a friction surface of an adjacent clutch member. The thrust members which are configured as solid centrifugal weights cooperate through an inclined plane with the outer synchronizer rings so that an axial force acting on the outer synchronizer rings prevents a rattling of the gears during idling operation of the transmission and low-speed operation of the engine. If during up or down shifting of gears, a difference of speed occurs between the clutch member and the inner synchronizer ring, a locking gear of the outer synchronizer ring prevents a displacement of the inner gearing of the sliding sleeve into a coupling gearing of the clutch member. In each of the thrust members there is arranged a locking pin and a compression spring. The locking pin has a spherical end and locks the sliding sleeve in its neutral position in a groove. During each gearshifting operation, the locking pin is displaced in axial direction and the thrust member entrained by the sliding sleeve exerts an axial force on the outer sychronizer ring to initiate synchronization. As soon as synchronous speeds are reached between the rotating elements, the sliding sleeve can be moved further and the locking pin is displaced out of the groove of the sliding sleeve. The solid thrust member made of cast or sintered metal leads to an undesired increase of the rotating mass of the transmission and, at the same time, the thrust member is not adequately guided in the inner synchronizer ring. Moreover, the prior art sychronizing device is comprised of individual elements which can only be assembled with great difficulty. The assembly of the synchronizing device involves the mounting of small, separate parts such as the thrust member, the locking pin and the compression spring so that the manual work required is very intensive. It must also be remembered in this connection that commonly used synchronizing devices normally have four thrust members. Great problems of quality can also arise if, for example, during manual assembly, the installation of individual thrust members is forgotten.
In another synchronizing device known from DE-A 27 06 661, the thrust members are comprised of a sheet metal body extending essentially axially and a guide sleeve rigidly fixed thereto. This guide sleeve comprises a through-bore for receiving a locking element and a compression spring which is supported at one end on an abutment fixed in the inner synchronizer ring and at the other end on the spherical locking element. During every gearshifting operation, the compression is disadvantageously subjected to a bending load because the sliding sleeve displaces the thrust member together with the locking element in an axial direction of the sliding sleeve, while the opposite end of the compression spring is guided in the fixed receiving portion of the inner synchronizer ring. A further disadvantage is that for the assembly of the synchro
REFERENCES:
patent: 2574004 (1951-06-01), Zingsheim
patent: 3086633 (1963-04-01), Winter
patent: 4059178 (1977-11-01), Magg et al.
patent: 4712662 (1987-12-01), Elverdam
Ploetz Volker
Soyka Wilfried
Winkler Manfred
Bonck Rodney H.
INA Walzlager Schaeffler KG
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