Assembled camshaft, main camshaft body and method for producing an assembled camshaft

摘要

A camshaft that is assembled or is to be assembled carries at least one cam element that is to be disposed on a main camshaft body to be rotationally fixed and axially movable, and at least one cam element to be disposed on the main camshaft body so as to be rotationally fixed and axially immovable. The main camshaft body has first axial sub-sections having a multi-tooth profile, so that due to a positive connection between shaft and hub the cam element to be disposed in the sub-section so as to be axially movable is seated so as to be rotationally fixed. The main camshaft body also has second axial sub-sections having an extended diameter so that by a non-positive connection between shaft and hub it is ensured that the cam element to be disposed in the sub-section is seated so as to be rotationally fixed and secured against movement.

主权项

1. A method of producing a built-up camshaft, the method comprising steps of:
providing a bar-shaped main camshaft body, machining the main camshaft body by
surface-machining the main camshaft body in a first axial sub-section by introducing a multi-tooth outer surface profile that extends in an axial direction,surface-machining the main camshaft body in a second axial sub-section, which as seen in a predetermined thread-on direction is located downstream of the first sub-section, by enlarging at least regions of the main camshaft body to an increased outer diameter to form an enlarged region,providing a plurality of cam elements, each having a hub cross-section with a multi-tooth inner surface profile that, extends in the axial direction and correlates with the multi-tooth outer surface profile of the first axial sub-section, wherein each hub cross-section has a minimum inner diameter that is smaller in dimension than a maximum diameter of the increased outer diameter in the second sub-section of the main camshaft body, assembling the cam elements by
sliding a first cam element of the plurality of cam elements in the thread-on direction over the first axial sub section as far as against the enlarged region of the second axial sub-section onto the main camshaft body, the slid-on first cam element is oriented with angular precision with a predetermined reference position of the main camshaft body and is connected in a non-positive or positive manner to the main camshaft body by subsequent axial relative movement between the first cam element and main camshaft body that causes the multi-tooth inner surface profile of the first cam element to dig in a metal cutting manner into the enlarged region of the second axial sub-section, the first cam element disposed in a rotationally fixed and axially non-displaceable manner on the main camshaft body,subsequently sliding a second cam element of the plurality of cam elements with angular orientation in the thread-on direction as far as into the first sub-section onto the main camshaft body where it is positioned in a rotationally fixed and axially displaceable manner.