Abstract: A central release device (10) is disclosed having a cylinder housing (12), with a cylindrical wall (14), and a guide sleeve (16), which is arranged concentrically therewith and on which an annular piston (18), which can be operatively connected to a clutch and can be hydraulically actuated by way of a pressure chamber (20) defined by the cylindrical wall and the guide sleeve, is displaceably guided. At its end the guide sleeve has an annular flange (22) with an end face (24) facing away from the annular piston and a radially outer circumferential surface (26), by way of which flange the guide sleeve is fixed to an end face (28) of the cylinder housing.

Abstract: A central release device (10) is disclosed having a cylinder housing (12), with a cylindrical wall (14), and a guide sleeve (16), which is arranged concentrically therewith and on which an annular piston (18), which can be operatively connected to a clutch and can be hydraulically actuated by way of a pressure chamber (20) defined by the cylindrical wall and the guide sleeve, is displaceably guided. At its end the guide sleeve has an annular flange (22) with an end face (24) facing away from the annular piston and a radially outer circumferential surface (26), by way of which flange the guide sleeve is fixed to an end face (28) of the cylinder housing.

Abstract: The tire pressure sensor (13) for monitoring vehicle tires is fastened radically relative to the wheel axis at the circumference of a wheel rim and includes a reference pressure chamber (20) with a contact pin (22) which cooperates with an electrically conductive diaphragm (21) closing the reference pressure chamber (20) toward the tire. An added mass (30) is fastened freely at the diaphragm center for raising the switching threshold of the tire pressure sensor (13) as a function of speed and is dimensioned in such a way that the switching threshold is raised by a desired pressure differential (.DELTA.p) relative to the switching threshold p.sub.o at standstill at a predetermined radius r of the diaphragm (21), a predetermined rotational radius R of the diaphragm (21) and a predetermined rotational speed v of the diaphragm (21). The required added mass (m) results from the equation m=f(.DELTA.p, r.sup.2, R, v.sup.2), advantageously m=(.pi./4)r.sup.2 {[R/v.sup.2 ].DELTA.p - p.

Abstract: The tire pressure sensor for motor vehicle has a reference pressure chamber (19), which is constructed as a pressure switch, including a contact diaphragm (22) and a contact pin (23). The reference pressure chamber (19) is closed toward the rim side by a ring diaphragm (28) connected at its inner rim with the housing of the pressure switch and at its outer rim (29) with the contact diaphragm (22) via a mass ring (26) for the purpose of shifting the threshold value of the pressure switch in a speed-dependent manner.

Abstract: A tire pressure sensor for monitoring pressure in the tire of a motor vehicle wheel and comprising a reference pressure chamber, two contact members extending through a bushing insulator arranged in the base of the reference pressure chamber, and an electrically conducting diaphragm that separates the reference pressure chamber from the tire interior. The diaphragm has two contact zones that engage sequentially the two contact members upon being bent in response to air pressure in the tire interior reaching, respectively, a first value and a second value greater than the first value.