Multiple helically toothed gearwheel pressed in one piece has first helical toothing with different spiral pitch to second helical toothing, and root diameter which deviates at most by 10 per cent of that of second toothing

摘要

The multiple helically toothed gearwheel pressed in one piece has a first and second toothing formed by a pressing of the gearwheel (20') in a press tool with a cylindrical generated surface of a first forming tool section (3) and cylindrical surface of a second forming tool section (6). The first helical toothing has different spiral pitch to the second helical toothing, and has a root diameter which deviates at most by 10 per cent of that of the second toothing. The gearwheel in a section axially between the two sets of toothing has the same low-failure structure as in the axial sections in which the helical toothing sets are formed. Independent claims are included for a pressing procedure to form a multiple helically toothed gear, and for a press tool for the one piece pressing of a multiple helically toothed gearwheel.