Abstract: A multi-range transmission for motor vehicles having a first gear and a second gear mounted side by side on a common shaft, and a synchronizing device, for matching the speed of the gears, located between the gears and movable axially relative thereto. An actuating element of the synchronizing device rotates with the first gear, the actuating element can be rotate with respect to the gearbox only through a limited angle of rotation and has a circumferential friction surface which can be brought into contact with an opposing friction surface of the second gear when axially moved. In order to permit synchronized shifting with a constant shift time, which is independent of the shift force applied manually, the actuator has a first inclined surface set at an angle to a radial plane which contacts a second inclined surface of with the first gear.

Abstract: A method serves for manufacturing frictional locking rings, in particular for stepped motor vehicle transmission synchronizing mechanisms, in which a sintered frictional coating is applied on a surface of the element and the sintered frictional coating is compacted.For simplifying the method and improving the reproducibility of the dimensions of the surface of the sintered frictional coating one first applies a frictional coating of a sintering powder in a predetermined raw dimension regarding its thickness and compacts the frictional coating thereafter under pressure to a predetermined nominal dimension.

Abstract: A method for manufacturing a frictional locking member, in particular a synchronizing ring. The surface of a metallic base member (2) is provided with a frictional body made of a sintering powder.In order to simplify the method, the base member (2) is combined with an insert member (20). The insert member has centering means (24) for retaining the base member (2) in a defined position and at a defined distance (23) from the counter surface (22) arranged at a defined distance (23) from the surface (14). The cavity (27) formed by the defined distance (23) between the surface (14) and the counter surface (22) is filled with a sintering powder, and the insert member (20) is sintered together with the base member (2) with the cavity (27) filled (FIG. 4).

Abstract: In a gear shifting device for the manual transmission of a motor vehicle with a gearshfit lever, with which the individual gear steps can be engaged over a gearshift rod, the gear shifting motion of the gearshift lever is transferred to the gearshift rod in a nonmechanical manner. The movement of the gearshift lever from the neutral position into the gear shifting position takes place in two steps, the first step acting as a preselection step and the function of the second step being to engage the selected gear step. A locking device permits movement of the gearshift lever from the first into the second step only when the necessary conditions exist for engaging the selected gear step perfectly; that is, when the clutch is disengaged and the gear wheels of the gear steps to be engaged are synchronized.