Carl Hurth Maschinen- Und Zahnradfabrik Gmbh & Co.

Feldmuhle Aktiengesellschaft

Sinterstahl Gmbh

Hermann Pflaum

Herbert Vojacek

Richard Strehler

A friction clutch or friction brake is provided having a basic body and a friction body portion. The friction body portion can be mass-produced separately from the basic body, using a planar metal sheet-like material which is treated leading to a sintered powder friction facing. The friction clutch has a non-planar friction surface, operating in a box filled with oil as a lubricant. The friction body is applied to the basis body by form-locking friction, friction-gripping and/or material-locking techiques. In a preferred embodiment, the friction clutch or brake is a synchronizing ring and/or a correcting ring for motor vehicle shift gears. The friction clutch or friction brake according to the invention has particularly favorable friction properties, a long service life and low manufacturing costs. In a great number of applications, the shaping of separte draining grooves for expelling the oil when the friction grip is produced between matching components can be omitted.

Friction clutch or friction brake

An apparatus and a method for the testing of synchronizing devices. In contrast to a conventional apparatus, in which only one rotating transmission gear or rather its synchronizing cone cooperates with a nonrotating synchronizing ring, it is now possible to test a complete synchronizing device consisting of two transmission gears, two synchronizing rings and one gear-shift sleeve with a hub. A transmission gear is fixedly connected to a rigid frame, the other transmission gear is connected to the drive through a drive shaft. The hub with the gear-shift sleeve is coupled with a flywheel mass on the driven side. The flywheel mass on the driven side is during a first shifting operation connected to the drive and is accelerated to the driving speed for testing. The flywheel mass now rotating at the driving speed is then again delayed until standstill through the synchronizing device during a second shifting operation.

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Maisach, Germany

Hermann Pflaum