Automotive transmission system
AssigneeJ.M. Voith GmbH
InventorHermann Klaue
Life of this patent
Estimating the term…
Abstract
A multiple speed transmission, specifically for motor vehicles, comprises a main shaft 24 and two auxiliary shaft 24.sub.1 and 24.sub.2. Arranged on these shafts are several gear wheel groups of which three gear wheels each are constantly in mesh. Arranged on the main shaft 24, for shifting the gears, are sliding sleeves 24.sub.3, 24.sub.4, 24.sub.5, 24.sub.6 of which one each can be coupled to one of the gear wheels (by use of an operating cylinder) in interlocking fashion. To create synchronism on the sliding sleeve to be engaged, either an accelerating device 33 or a retarding device 36 acts on one of the auxiliary shafts, depending on shifting direction. Contingent upon reaching synchronism on the respective sliding sleeve, a mircoprocessor controls the servoagent supply to the respective operating cylinder.
Claims19
A multiple speed transmission for motor vehicles having a plurality of gear ratios, said transmission comprising:
- a main transmission shaft and at least one juxtaposed auxiliary transmission shaft, a plurality of gear wheel groups mounted thereon, each of said gear wheel groups having at least two gears which are in permanent meshing arrangement;
- sliding sleeves for shifting between said gear wheel groups, which sleeves are positioned on one of said transmission shafts, said sleeves are rotationally fixed and axially slidable on said transmission shaft to positively couple with at least one gear;
- a selector fork for each of said sliding sleeves;
- actuating cylinders having actuating pistons therein, each of said pistons operably connected to one of said selector forks and movable by communication of a servoagent to said cylinder to move said selector fork;
- an accelerating device;
- a retardation device;
- said accelerating device and said retardation device acting on one of said auxiliary shafts to synchronize one of said sliding sleeves for engagement with one of said gears;
- an electrical control means for receiving sensed rotational speed signals and shift commands to control communication of said servoagent to said actuating cylinders and pistons in response to synchronism of the respective sliding sleeve;
- dual frictional shifting elements;
- an auxiliary transmission component which is operable by said dual frictional shifting elements to provide a split speed arrangement which doubles the number of gear ratios of said transmission;
- and,
- said accelerating device having a planetary gear set for a necessary speed jump and a friction brake, said planetary gear set adapted to connect said main transmission shaft to said one of said auxiliary shafts.
Dependencies are inferred from the claim text.