Abstract: A planetary friction gear is enabled to make it possible to transmit comparatively great torque densities while providing a very high degree of smoothness of operation, preventing the unwanted slip-stick behavior in friction gears. The inventive gear is particularly suitable for actuators used in the immediate vicinity of humans in everyday life.

Abstract: A planetary friction gear is enabled to make it possible to transmit comparatively great torque densities while providing a very high degree of smoothness of operation, preventing the unwanted slip-stick behavior in friction gears. The inventive gear is particularly suitable for actuators used in the immediate vicinity of humans in everyday life.

Abstract: The invention relates to a method for effecting torque transmission in a single-stage planetary gear comprising 2-6 planet units. The arrangement and the interaction of individual gear elements in conjunction with a method for mounting and adjusting them result in a torque transmission with uniform load distribution to the individual planet units.

Abstract: The invention relates to a method for effecting low-loss torque transmission in a single-stage planetary gear comprising 2-6 planet units. The arrangement and the interaction of individual gear elements in conjunction with a method for mounting and adjusting them result in a low-noise and low-loss torque transmission with uniform load distribution to the individual planet units.

Abstract: The present invention relates to terpene ethers of the general formula (I) in which the substituents have the meanings defined in the description, to a process for their preparation and to their use. The novel terpene ethers are suitable as traction fluids, as fragrances, as solvents and as reactive intermediates.

Abstract: 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.

Abstract: In lubricated friction couplings, at least two surfaces are connected by frictional engagement. These surfaces in engagement with one another are termed friction partners. One friction partner consists of a ceramic material and the other friction partner consists of a metallic material or a ceramic material having a chemical composition other than that of the first friction partner. The metallic material is a material of the iron group, preferably sintered metal. The ceramic material is oxide ceramic, especially aluminium oxide or zirconium oxide or silicon nitride. The pairing of metal, especially sintered steel, against oxide ceramic increases the service life of the coupling while at the same time reducing the coupling travel.The ceramic material can be connected to a carrier member, for example in the form of segments sintered into the carrier member.

Abstract: Certain spirocyclic ketals of the formula ##STR1## in which R.sup.1 in the case where R.sup.2 denotes hydrogen, represents a cyclohexyl radical optionally substituted by lower alkyl, lower alkoxy and/or cycloalkyl with 5 to 7 carbon atoms, or in whichR.sup.1 and R.sup.2 are linked through 4 methylene groups, which are optionally substituted by lower alkyl, lower alkoxy and/or cycloalkyl with 5 to 7 carbon atoms and form a further acyclic ring.R.sup.3, R.sup.4 and R.sup.5 are identical or different and denote hydrogen, lower alkyl, lower alkoxy or cycloalkyl with 5 to 7 carbon atoms, andZ denotes alkylene with 2 to 4 carbon atoms which is optionally substituted by lower alkyl and/or cycloalkyl with 5 to 7 carbon atoms,are disclosed together with their use in power transmission fluids.

Abstract: The new polyethers obtainable by polymerization of an 1,2-epoxyalkane with 8 to 26 carbon atoms, and a tetrahydrofuran in the presence of a hydroxyl compound of the formulaH-OR.sup.1in which R.sup.1 denotes hydrogen, an alkyl radical having 1 to 24 carbon atoms or a hydroxyalkyl radical having 2 to 40 carbon atoms are disclosed together with their use as lubricants.