A security device includes at least one non-volatile memory element and a key memory having at least one non-volatile memory element including at least one data field. The security device provides a physical interface for the data exchange with a key memory, the range of the physical interface being spatially restricted, and the key memory being location-bound. The security device includes at least one calculation unit, which dynamically ascertains in particular the check-sum information from the parameter data record.

A security device includes at least one non-volatile memory element and a key memory having at least one non-volatile memory element including at least one data field. The security device provides a physical interface for the data exchange with a key memory, the range of the physical interface being spatially restricted, and the key memory being location-bound. The security device includes at least one calculation unit, which dynamically ascertains in particular the check-sum information from the parameter data record.

Embodiments of the invention are shown in the figures, where a method for manufacturing a gearbox, the method comprising: providing a predefined interval around an integer; providing a gearbox setup; determining a speed ratio of at least two components of the gearbox setup; comparing the speed ratio with the predefined interval around the integer; and manufacturing a gearbox in accordance with the gearbox setup in dependence on the comparison.

A method for operating an idling automatic transmission of a motor vehicle having a torque converter, wherein the torque converter comprises at least one pump wheel and a turbine wheel which are designed to transmit a torque hydrodynamically from one to the other. The method comprises at least the following steps: determinating (12) a rotation speed of the turbine wheel; determinating (14) a load on the motor of the motor vehicle; and recognizing (16) whether there is a blockage in the drive-train of the motor vehicle or whether the torque converter is running dry, as a function of the turbine rotation speed and the motor load detected. The invention also relates to a monitoring device (10).

An individual chain wheel for a bicycle front crank arrangement for engaging in a drive chain includes a plurality of teeth formed on a circumference of the chain wheel and having a first and a second group of teeth. The teeth of the second group of teeth are arranged in an alternating manner between the teeth of the first group of teeth. Each tooth has a load flank via which force is transmitted between an adjacent roller of the drive chain and the respective tooth. Each tooth of the first group may also have at least one profile with an opening in the vicinity of the flank, in which a portion of an inner link plate of the drive chain, which portion protrudes beyond the roller, engages.

An individual chain wheel for a bicycle front crank arrangement for engaging in a drive chain includes a plurality of teeth formed on a circumference of the chain wheel and having a first and a second group of teeth. The teeth of the second group of teeth are arranged in an alternating manner between the teeth of the first group of teeth. Each tooth has a load flank via which force is transmitted between an adjacent roller of the drive chain and the respective tooth. Each tooth of the first group may also have at least one profile with an opening in the vicinity of the flank, in which a portion of an inner link plate of the drive chain, which portion protrudes beyond the roller, engages.

A belt-type continuously variable transmission includes an actual gear ratio calculation unit for calculating an actual gear ratio based on the rotation speed of a drive pulley and the rotation speed of a driven pulley, a reference gear ratio calculation unit for calculating a reference gear ratio by modifying the actual gear ratio based on an input torque and a driven pulley hydraulic pressure, and a condition determination unit for, in a case where the target gear ratio is an overdrive gear ratio, determining that at least part of rings of a belt is missing when the reference gear ratio is greater than or equal to a predetermined gear ratio and a drive pulley hydraulic pressure is greater than or equal to a predetermined hydraulic pressure.

An annular body includes a base, a first resistance wire, a second resistance wire, a first terminal, and a second terminal. The base surrounds a central axis and expands in a direction intersecting the central axis. Resistance values of the first and second resistance wires change according to strain of the base. The first terminal is electrically connected to the end of the first resistance wire. The second terminal is electrically connected to an end of the second resistance wire. The first terminal is at a first position in the circumferential direction. The second terminal is at a second position in the circumferential direction. When viewed in the axial direction, the central angle defined by the first position, the central axis, and the second position is equal to or greater than about 90°.

An annular body includes a base, a first resistance wire, a second resistance wire, a first terminal, and a second terminal. The base surrounds a central axis and expands in a direction intersecting the central axis. Resistance values of the first and second resistance wires change according to strain of the base. The first terminal is electrically connected to the end of the first resistance wire. The second terminal is electrically connected to an end of the second resistance wire. The first terminal is at a first position in the circumferential direction. The second terminal is at a second position in the circumferential direction. When viewed in the axial direction, the central angle defined by the first position, the central axis, and the second position is equal to or greater than about 90°.

A screw device is provided which applies preload with a single nut and can easily detect preload. The screw device of includes: a screw shaft having an outer helical groove; a nut fitted on the screw shaft, the nut having an inner helical groove, and a return path to which a passage formed between the outer groove and the inner groove is connected; a plurality of rolling elements placed between the passage and the return path; and a strain sensor attached to an outer surface of the nut. At least one hole is provided between an attachment surface, to which the strain sensor is attached, of the nut and/or a vicinity thereof and an inner surface of the nut.