Abstract: An apparatus and method to enhance complexity in user-selected passwords. The apparatus includes an input module to receive a sequence of key presses and key releases from a user. A comparator module compares the sequence to a stored sequence of key presses and key releases, where the stored sequence functions as a password to restrict access to a particular resource such as computer files, documents, networks, and/or programs. An access module may grant access to the user if the sequence entered matches the stored sequence of key presses and key releases.

Abstract: A method and an apparatus for verification of arithmetic digital circuits is disclosed, wherein a first circuit, called a specification, is compared for equivalence with a further circuit called an implementation, with equivalence occurring when and only when the specification and implementation always produce the same output signals for the same input signals. The gate level description of the specification and implementation are converted to a network of elementary arithmetic 1-bit operations (XOR, half-adders, full adders) and the equivalence of the specification and implementation is identified in that a comparison of the resultant networks from elementary arithmetic 1-bit operations is carried out directly.

Abstract: A pressing force transmission plate (126) for a friction clutch comprises an annular plate body (150) and at least one impingement area (152) for the introduction of a force exerted by an energy accumulator (130), preferably a diaphragm spring, wherein the plate body (150) and impingement area (152) are flexibly connected by a connection area (154), and wherein the plate body (150) and impingement area (152) form a leg spring arrangement.

Abstract: A pressure plate for a friction clutch includes a ring-like pressure plate body with a pressure surface on a first axial side for exerting pressure on friction elements, and at least one support element on a second axial side opposite the first axial side. The at least one support element is a separate element from the pressure plate. The at least one support element is arranged for receiving a pressure from a force-exerting arrangement such as a diaphragm spring.

Abstract: The invention relates to a method and an apparatus for verification of arithmetic digital circuits, wherein a first circuit, called a specification, is compared for equivalence with a further circuit called an implementation, with equivalence occurring when and only when the specification and implementation always produce the same output signals for the same input signals. The gate level description of the specification and implementation are converted to a network of elementary arithmetic 1-bit operations (XOR, half-adders, full adders) and the equivalence of the specification and implementation is identified in that a comparison of the resultant networks from elementary arithmetic 1-bit operations is carried out directly.

Abstract: A friction coupling for use in particular in the drive train of a motor vehicle includes a clutch casing, a pressure plate which is guided in a rotationally fixed manner with respect to the clutch casing, at least one clutch disk and a spring device containing about 40-60% nickel. A method for coating a nickel-base material, in particular the above mentioned spring element for friction clutches, wherein at least part of the surface of the spring device contains boride, and also a method for producing such a spring device which includes a heat treatment are also disclosed.

Abstract: A housing for a multiple-disc clutch includes a toothed ring having a plurality of disc-driving teeth arranged on an inner circumferential surface of the same so as to be distributed in the circumferential direction and extending in a ring longitudinal direction. A flywheel is connected to a first end of the toothed ring for common rotation and a cover is connected to a second end the toothed ring for common rotation. At least one component of the cover and flywheel is connected to the toothed ring by a fastening arrangement that does not include fastening bolts.

Abstract: A housing for a multiplate clutch includes a toothed ring having a plurality of multiplate driver teeth arranged on an inner peripheral surface thereof distributed in the peripheral direction, and extending in a ring longitudinal direction. A flywheel disk is connected to the toothed ring at a first end of the same for common rotation. A cover is connected to the toothed ring at a second end of the same for common rotation. In this case, the toothed ring is connected to the flywheel disk by welding.

Abstract: The invention relates to a friction clutch in which an axial play is provided between an inner disk and a hub of a clutch disk. The axial play can be influenced by a device during assembly of the friction clutch in an engine and transmission of a motor vehicle drivetrain such that the hub is displaced, within the axial play, into the position in the axial play which lies closest to a flywheel of the friction clutch.

Abstract: A housing for a plate clutch having a toothed ring with a plurality of plate driving teeth which are arranged at an inner circumferential surface of the same so as to be distributed in the circumferential direction and which extend in a longitudinal direction of the ring. A flywheel is connected with the toothed ring at a first end of the same so as to rotate jointly therewith. A cover is connected with the toothed ring at a second end for joint rotation, wherein at least one of the flywheel and cover is connected with the toothed ring by a fastening arrangement. The fastening arrangement includes, in at least one of the plate driving teeth, a recess extending in the longitudinal direction of the ring and opening toward the one of either the flywheel and cover, and a fastening bolt element which is associated with this recess and which penetrates a fastening opening of either the flywheel or cover and projects into the associated recess.

Abstract: The invention is directed to a plate clutch with a housing having a front cover and axially projecting feet. The feet are provided with longitudinal bores through which fastening screws are guided. The fastening screws are constructed as expansion screws with a middle region which is reduced in diameter. The feet are provided with radial ventilation openings in the reduced diameter region of the fastening screws.

Abstract: The invention is directed to a plate clutch with improved heat removal characteristics. For this purpose, additional axial and radial aerating openings are arranged in the torque-transmitting teeth of the clutch housing.