Adjustment gearing device for a shaft, and vehicle comprising the adjustment gearing device

Abstract

The disclosure relates to an adjustment gearing device for a shaft, comprising a strain wave gearing. The strain wave gearing has a spur gear device and an inner rotor, and the spur gear device has a first cylindrical section and a collar section. The first cylindrical section has a first diameter, and an outer toothing, and the inner rotor has an inner toothing, said outer toothing and inner toothing meshing together at least in some regions. The adjustment gearing device also comprises an outer rotor, said inner rotor being rotatable in a rotational direction relative to the outer rotor. The spur gear device is rotationally fixed to the outer rotor, and has a second cylindrical section for contacting the outer rotor. The second cylindrical section has a second diameter, and the second diameter is larger than the first diameter.

Claims

1. An adjustment gearing device for a shaft, comprising: a ring arrangement; a strain wave gearing, including: a spur gear device having a first cylindrical portion and a collar portion, the first cylindrical portion having a first diameter and an external toothing, an inner rotor having an internal toothing, the external toothing and the internal toothing intermeshing in some areas, an outer rotor, and, the inner rotor capable of rotating in a circumferential direction relative to the outer rotor, and the spur gear device rotationally fixed to the outer rotor, the spur gear device including a second cylindrical portion for bearing on the outer rotor, the second cylindrical portion having a second diameter greater than the first diameter, the collar portion arranged as an intermediate portion between the first and the second cylindrical portion, the ring arrangement bearing on the second cylindrical portion, and, a press-fit formed between the ring arrangement, the second cylindrical portion, and the outer rotor, and, wherein the adjustment gearing device is configured for varying a compression ratio of a reciprocating piston engine or for varying a phase position between a camshaft and a crankshaft.

2. The adjustment gearing device as claimed in claim 1, wherein the second cylindrical portion rests on a radially outer side of the outer rotor and is rotationally fixed to the outer rotor, and a relative rotation between the inner rotor and the spur gear device leads to a relative rotation of the outer rotor and the shaft.

3. The adjustment gearing device as claimed in claim 1, wherein the second cylindrical portion includes at least one of a first toothing on its inner cylindrical surface or a second toothing on its outer cylindrical surface, and at least one of the outer rotor or the ring arrangement form a mating contour with the first or second toothing, so that the second cylindrical portion meshes with at least one of the outer rotor or the ring arrangement.

4. The adjustment gearing device as claimed in claim 1, wherein an axial end area of the second cylindrical portion forms a positive interlock with at least one of the outer rotor or the ring arrangement.

5. The adjustment gearing device as claimed in claim 1, wherein the first and the second cylindrical portion are arranged coaxially with a main axis of rotation of the strain wave gearing, wherein the second cylindrical portion is collinear with the first cylindrical portion in an axial direction.

6. The adjustment gearing device as claimed in claim 1, wherein the first and second cylindrical portions and the collar portion are integrally connected to one another.

7. The adjustment gearing device as claimed in claim 1, wherein the spur gear device is a collared sleeve, and the second cylindrical portion is formed by deformation of the collar portion.

8. A vehicle comprising the adjustment gearing device as claimed in claim 1.

9. An adjustment gearing device for a shaft, comprising: a ring arrangement; a strain wave gearing, including: a spur gear device having a first cylindrical portion and a collar portion, the first cylindrical portion having a first diameter and an external toothing, an inner rotor having an internal toothing, the external toothing and the internal toothing intermeshing, an outer rotor, and, the inner rotor capable of rotating in a circumferential direction relative to the outer rotor, and the spur gear device rotationally fixed to the outer rotor, the spur gear device including a second cylindrical portion that contacts the outer rotor, the second cylindrical portion having a second diameter greater than the first diameter, the collar portion arranged as an intermediate portion between the first and the second cylindrical portion, the second cylindrical portion rotationally fixed to the outer rotor, and, the ring arrangement rotationally fixed to the second cylindrical portion, and, wherein the adjustment gearing device is configured for varying a compression ratio of a reciprocating piston engine or for varying a phase position between a camshaft and a crankshaft.

10. The adjustment gearing device of claim 9, wherein surface texturing is applied to at least one of an inner cylindrical surface of the second cylindrical portion or a radially outer side of the outer rotor.

11. The adjustment gearing device of claim 9, wherein the second cylindrical portion is axially locked to at least one of the outer rotor or the ring arrangement.

12. The adjustment gearing device of claim 9, wherein the first cylindrical portion and the second cylindrical portion form a U-shape.

13. The adjustment gearing device of claim 12, wherein the second cylindrical portion is shorter in axial length than the first cylindrical portion.

14. The adjustment gearing device of claim 12, wherein the second cylindrical portion has an axial length ranging from 5 mm to 20 mm.

15. The adjustment gearing device of claim 9, wherein the second cylindrical portion includes at least one of a first toothing on its inner cylindrical surface or a second toothing on its outer cylindrical surface, and at least one of the outer rotor or the ring arrangement form a mating contour with the first or second toothing.

16. The adjustment gearing device of claim 9, wherein the external toothing and the internal toothing mesh together in two areas that are offset by 180 degrees about an axis of rotation.

17. The adjustment gearing device of claim 9, wherein a difference between the first diameter and the second diameter is less than 8 cm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further features, advantages and effects of the disclosure emerge from the following description of an exemplary embodiment of the disclosure and the figures attached, of which:

(2) FIG. 1 in a longitudinal section shows a detail of an adjustment gearing device as an exemplary embodiment of the disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(3) Corresponding or identical parts are provided with the same reference numerals in each of the figures.

(4) FIG. 1 in a longitudinal section shows a detail of an adjustment gearing device 1. The adjustment gearing device 1 serves for adjusting the phase position of a camshaft of a combustion engine relative to the phase position of a crankshaft of the combustion engine. The adjustment gearing device 1 is arranged in the transmission in series between the crankshaft and the camshaft.

(5) The adjustment gearing device 1 comprises a drive 2, which takes the form of an outer rotor 3, for example a chain sprocket, and an output 4, which takes the form of a shaft, for example, an inlet or an exhaust camshaft, which is coupled, rotationally fixed to an inner rotor 5, for example, a driven internal gear. For example, the drive 2 is gear-connected to the crankshaft, the output 4 is gear-connected to the camshaft, for example, or is formed by the camshaft. The camshaft may be arranged coaxially with the inner rotor 5, for example.

(6) The adjustment gearing device 1 comprises a strain wave gearing 6, in order to produce a relative rotation between the drive 2 and the output 4, in order to vary the phase position between the crankshaft and the camshaft. The strain wave gearing 6 is formed by a wave generator 7, the inner rotor 5 and a spur gear device 8. The strain wave gearing 6 is also referred to as a Harmonic Drive.

(7) In axial top view, the wave generator 7 has an elliptical shape and can be set in rotation by a drive device (not shown), for example, an electric motor. The spur gear device 8 comprises a first and a second cylindrical portion 8a, b and a collar portion 8c. In an unstressed and/or detached state the first and/or the second cylindrical portion 8a, b each take the form of a circular hollow cylinder or sleeve. The first and the second cylindrical portion 8a, b are arranged coaxially and/or concentrically with one another relative to the main axis of rotation H. The two cylindrical portions 8a, b here have different diameters, wherein the diameter of the first cylindrical portion 8a is smaller than the diameter of the second cylindrical portion 8b.

(8) In its basic shape the collar portion 8c takes the form of an annular disk and extends in a radial plane relative to the main axis of rotation H. The collar portion 8c connects the two cylindrical portions 8a, b directly to one another, wherein the two cylindrical portions 8a, b extend in the same direction, for example, at right-angles to the collar portion 8c, in an axial direction relative to the main axis H and/or directly adjoin the collar portion 8c. The collar portion 8c may have tangentially and/or radially oriented openings in order to reduce the flexural rigidity in this portion. This can serve to reduce the stresses of the spur gear device 8 occurring in this area. For example, the openings are arranged uniformly spaced at a distance from one another in the circumferential direction relative to the main axis H.

(9) The spur gear device 8 takes the form, for example, of a collared sleeve, wherein the second cylindrical portion 8b is formed by deformation of the collar. The second cylindrical portion 8b is shorter in its axial extent than the first cylindrical portion 8a. The second cylindrical portion 8b, for example, has a axial length of more than 5 mm, but potentially less than 20 mm.

(10) The outer rotor 3 comprises a receiving portion 9 for receiving the second cylindrical portion 8b. In particular, the receiving portion 9 may take the form of an offset or step, running in the circumferential direction, in an edge area of the outer rotor 3. In a radial direction and in the circumferential direction relative to the main axis of rotation H, the second cylindrical portion 8b rests with its inner cylindrical surface on the receiving portion 9. In an axial direction relative to the main axis H, the collar portion 8c bears on the outer rotor 3, and/or the second cylindrical portion 8b on the receiving portion 9.

(11) On an axial end area, the first cylindrical portion 8a comprises an external toothing 10 and is of elastic and/or flexible design in this area. The wave generator 7 comes into contact with the first cylindrical portion 8a in the area the external toothing 10 on the radially inner side.

(12) The inner rotor 5 comprises an internal toothing 11, which meshes with the external toothing 10 in two areas of engagement. The numbers of teeth in the external toothing 10 and the internal toothing 11 differ, so that running out of the areas of engagement in the circumferential direction about a main axis of rotation H of the adjustment gearing device 1 leads to a relative rotation between inner rotor 5 and spur gear device 8.

(13) The adjustment gearing device 1 comprises a ring arrangement 12. The ring arrangement 12 is pressed onto the second cylindrical portion 8b, wherein a press-fit connection is formed between the ring arrangement 12, the second cylindrical portion 8b and the outer rotor 3. The second cylindrical portion 8b is therefore connected to the outer rotor 3 and the ring arrangement 12 in a radial direction and/or in the circumferential direction, relative to the main axis of rotation H, frictionally and/or non-positively and/or by positive interlock, so that a relative rotation between the inner rotor 5 and the spur gear device 8 leads to a relative rotation of the outer rotor 3 and the shaft. For this to happen, a torque path runs from the outer rotor 3 via the spur gear device 8 to the inner rotor 5 and consequently to the shaft.

(14) For example, the second cylindrical portion 8b may have a surface texturing, for example knurling, rough surface, teeth etc. on its inner cylindrical surface and/or on its outer cylindrical surface, so that the frictional connection is improved in the circumferential direction, for example.

(15) Alternatively or as an optional addition, the second cylindrical portion 8b may have a toothing on its inner cylindrical surface and/or on its outer cylindrical surface, wherein the ring arrangement 12 and/or the receiving portion 9 form a mating contour and therefore mesh with the second cylindrical portion 8b. It is possible here, for example, for the spur gear device 8 with the second cylindrical portion 8b to be pushed onto the receiving portion 9 in an axial direction relative to the main axis of rotation H, so that via the toothing a positive interlock is formed in the circumferential direction.

LIST OF REFERENCE CHARACTERS

(16) 1 adjustment gearing device

(17) 2 drive

(18) 3 outer rotor

(19) 4 output

(20) 5 inner rotor

(21) 6 strain wave gearing

(22) 7 wave generator

(23) 8 spur gear device

(24) 8a first cylindrical portion

(25) 8b second cylindrical portion

(26) 8c collar portion

(27) 9 receiving portion

(28) 10 external toothing

(29) 11 internal toothing

(30) 12 ring arrangement

(31) H main axis of rotation