Actuating gear and method for assembling an actuating gear of an electromechanical camshaft adjuster
A harmonic drive of an electromechanical camshaft adjusters includes a drive wheel designed as a ring gear; an internally toothed output element mounted with radial play in the drive wheel; a further internally toothed element fastened to the drive wheel, the internal toothing of which has a diameter corresponding to the internal toothing of the output element; an adjuster assembly which is formed from a wave generator; an externally toothed flexible gear element which can be deformed by said wave generator, the external toothing of this flexible gear element meshing both with the internal toothing of the output element and with the internal toothing of the further element; an annular gap being formed between the further internally toothed element and an inner peripheral surface of a recess of the drive wheel. The width of the annular gap is at least partially greater than a radial play of the output element.
1 . A method for assembling an actuating gear of an electromechanical camshaft adjuster, comprising:
providing:
a drive wheel configured as a ring gear,
an internally toothed output element having:
an outside diameter matched to an inside diameter of the drive wheel, and
a first internal toothing, and
a further internally toothed element having:
a second internal toothing with a diameter corresponding to the first internal toothing of the internally toothed output element,
a disc-shaped section, and
a cylindrical section, and
an externally toothed flexible gear element surrounding a wave generator, and the externally toothed flexible gear element and the wave generator form an adjuster assembly,
inserting the internally toothed output element into the drive wheel,
partially inserting the adjuster assembly into the internally toothed output element so that an external toothing of the externally toothed flexible gear element partially meshes with the first internal toothing of the internally toothed output element,
inserting the further internally toothed element into an axially extending recess arranged on an axial end face of the drive wheel so that: i) a radial gap is formed between an outer peripheral surface of the disc-shaped section of the further internally toothed element and an inner peripheral surface of the axially extending recess, and a width of the radial gap is larger than a radial play of the internally toothed output element in the drive wheel, ii) the external toothing of the externally toothed flexible gear element partially meshes with the second internal toothing of the further internally toothed element, and iii) the internally toothed output element and the further internally toothed element are aligned, defining an aligned position, and
fixing the further internally toothed element in the aligned position on the drive wheel.
2 . The method according to claim 1 , wherein the further internally toothed element is screwed to the drive wheel.
3 . The method according to claim 1 , wherein a seal is arranged between the further internally toothed element and the drive wheel.
4 . The method according to claim 3 , wherein the seal is arranged in a groove formed on an axial end face of one of the further internally toothed element or the drive wheel.
5 . The method according to claim 1 , wherein the further internally toothed element and the drive wheel combine to form a housing for the internally toothed output element.
6 . The method according to claim 5 , wherein the further internally toothed element and the drive wheel combine to form a housing for the wave generator.
7 . The method according to claim 1 , wherein the cylindrical section of the further internally toothed element extends away from the internally toothed output element in an axial direction after inserting the further internally toothed element into the axially extending recess arranged on the axial end face of the drive wheel.
8 . A method for assembling an actuating gear of an electromechanical camshaft adjuster, comprising:
providing:
a drive wheel configured as a ring gear,
an internally toothed output element having:
an outside diameter matched to an inside diameter of the drive wheel, and
a first internal toothing, and
a further internally toothed element having a second internal toothing with a diameter corresponding to the first internal toothing of the internally toothed output element, and
an externally toothed flexible gear element surrounding a wave generator, and the externally toothed flexible gear element and the wave generator form an adjuster assembly,
inserting the internally toothed output element into the drive wheel,
partially inserting the adjuster assembly into the internally toothed output element so that an external toothing of the externally toothed flexible gear element partially meshes with the first internal toothing of the internally toothed output element,
placing the further internally toothed element on the externally toothed flexible gear element so that: i) the external toothing of the externally toothed flexible gear element partially meshes with the second internal toothing of the further internally toothed element, ii) the internally toothed output element and the further internally toothed element are aligned, defining an aligned position, and iii) an annular protrusion arranged on one of a first end face of the internally toothed output element or a second end face of the further internally toothed output element engages an annular groove with play, the annular groove arranged on a remaining one of the first end face or the second end face, and fixing the further internally toothed element in the aligned position on the drive wheel.
9 . The method according to claim 8 , wherein a seal is arranged between the further internally toothed element and the drive wheel.