Motor-transmission arrangement for an adjusting device for adjusting two components adjustable relative to each other

Abstract

A motor-transmission arrangement for an adjusting device for adjusting two components adjustable relative to each other can include a planetary gear system having a planetary carrier, a planetary gear with planetary gear toothing and which is rotatably mounted in the planetary carrier and with a ring gear with an internal toothing which engages with the planetary gear toothing. An electric motor can have a motor shaft which can be rotated about a motor shaft axis, which shaft interacts with the planetary gear system, and a housing which is closed with first and second housing covers in which the motor shaft is mounted via a first bearing section and a second bearing section.

Claims

1. A motor-transmission arrangement, comprising: a planetary gear system comprising: a planetary carrier; a planetary gear mounted for rotation in the planetary carrier about a planetary gear axis (A.sub.p) and comprising a planetary gear toothing; a ring gear having ring gear internal toothing which engages with the planetary gear toothing; and an electric motor comprising: a motor shaft, which can be rotated about a motor shaft axis and which interacts with the planetary gear system; a motor housing comprising a first motor housing cover, wherein the first motor housing cover faces the planetary gear system; wherein the motor shaft is mounted in the first motor housing cover by a first bearing section and also in the motor housing by a second bearing section; wherein the motor housing of the electric motor further comprises a second motor housing cover with which the motor housing is closed, and the motor shaft is mounted in the second motor housing cover by the second bearing section; and wherein the planetary carrier abuts against the first housing cover with an abutting surface, and wherein neither the planetary gear nor the planetary gear axis protrudes beyond the abutting surface.

2. The motor-transmission arrangement according to claim 1, wherein the first bearing section, the second bearing section, or both the first bearing section and the second bearing section, comprise a roller bearing for radial and axial mounting of the motor shaft.

3. The motor-transmission arrangement according to claim 2, wherein the first motor housing cover is injection-molded around the roller bearing.

4. The motor-transmission arrangement according to claim 1, wherein the ring gear is connected in a rotationally fixed manner to the first motor housing cover.

5. The motor-transmission arrangement according to claim 2, wherein the motor shaft has a motor shaft toothing which is directly arranged on the motor shaft and which engages with the planetary gear toothing.

6. The motor-transmission arrangement according to claim 5, wherein the motor shaft toothing (has an outer motor shaft toothing diameter and the motor shaft has a first motor shaft diameter, at least in a first shaft section following the motor shaft toothing, wherein the motor shaft toothing diameter is smaller than or equal to the first motor shaft diameter.

7. The motor-transmission arrangement according to claim 6, wherein the motor shaft has a second shaft section having a second shaft diameter which is smaller than the first shaft diameter.

8. The motor-transmission arrangement according to claim 7, wherein the roller bearing is arranged in the first shaft section.

9. The motor-transmission arrangement according to claim 1, wherein the motor shaft has a first motor shaft portion and a second motor shaft portion, which are connected in a rotationally fixed manner, wherein the first motor shaft portion has a motor shaft toothing which engages with the planetary gear toothing.

10. The motor-transmission arrangement according to claim 9, wherein the first bearing section is arranged on the first motor shaft portion.

11. The motor-transmission arrangement according to claim 9, wherein the first bearing section is arranged on the second motor shaft portion.

12. The motor-transmission arrangement according to claim 11, wherein the roller bearing is arranged in the first motor shaft portion and a spacer sleeve is provided between the roller bearing and the ring gear.

13. The motor-transmission arrangement according to claim 1, wherein the planetary gear system is configured as a helical wheel planetary gear system, wherein the planetary gear is mounted in the planetary carrier for rotation about a planetary gear axis and the planetary gear axis extends askew to a planetary carrier axis.

14. The motor-transmission arrangement according to claim 1, wherein the first motor housing cover is completely surrounded and the ring gear is at least partially surrounded by the housing.

15. A motor-transmission arrangement, comprising: a planetary gear system comprising: a planetary carrier; a planetary gear mounted for rotation in the planetary carrier and comprising a planetary gear toothing; a ring gear having ring gear internal toothing which engages with the planetary gear toothing; and an electric motor comprising: a motor shaft, which can be rotated about a motor shaft axis and which interacts with the planetary gear system; a motor housing comprising a first motor housing cover, wherein the first motor housing cover faces the planetary gear system; and wherein the motor shaft is mounted in the first motor housing cover by a first bearing section and also in the motor housing by a second bearing section; wherein the motor housing of the electric motor further comprises a second motor housing cover with which the motor housing is closed, and the motor shaft is mounted in the second motor housing cover by the second bearing section; wherein the motor shaft has a first motor shaft portion and a second motor shaft portion, which are connected in a rotationally fixed manner, wherein the first motor shaft portion has a motor shaft toothing which engages with the planetary gear toothing, and wherein the first bearing section is arranged on the first motor shaft portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) An exemplary embodiment of the present application will be described with reference to the accompanying figures below. Wherein:

(2) FIG. 1A shows sectional view of a first embodiment of a motor-transmission arrangement according to the present application in a not completely assembled state,

(3) FIG. 1B shows a perspective view of the motor-transmission arrangement shown in FIG. 1A in the completely assembled state,

(4) FIG. 2 shows a second embodiment of the motor-transmission arrangement according to the present application,

(5) FIG. 3 shows a third embodiment of the motor-transmission arrangement according to the present application,

(6) FIG. 4 shows a sectional view of a fourth embodiment of a motor-transmission arrangement according to the present application, each in the completely assembled state,

(7) FIG. 5 shows a sectional view of a fifth embodiment of a motor-transmission arrangement,

(8) FIG. 6 shows a sectional view of a sixth embodiment of a motor-transmission arrangement, each in the completely assembled state, and

(9) FIG. 7 shows a schematic of an adjusting device in a vehicle.

DETAILED DESCRIPTION

(10) FIGS. 1A and 1B show a first embodiment of a motor-transmission arrangement 10.sub.1 according to the present application, once in a not completely assembled state and once in the completely assembled state. The motor-transmission arrangement 10.sub.1 comprises a planetary gear system 12 and an electric motor 14. The electric motor 14 is equipped with a motor shaft 15, which can be rotated about a motor shaft axis A.sub.MW.

(11) The planetary gear system 12 comprises a planetary carrier 16, which defines a planetary carrier axis A.sub.PT and on which a total of three planetary gears 18 are mounted for rotation about a planetary gear axis A.sub.P. The planetary gears 18 have a planetary gear toothing 20. Furthermore, the planetary gear system 12 comprises a ring gear 22 having an internal toothing 24, which is in engagement with the planetary gear toothing 20.

(12) In the embodiment shown, the planetary gear system 12 is configured as a helical wheel planetary gear system 26. In this embodiment, the planetary gear axes A.sub.p run askew to the planetary carrier axis A.sub.PT. Furthermore, the ring gear 22 is configured as an internal helical wheel 28.

(13) The motor shaft 15 comprises a motor shaft toothing 30 which is directly arranged on the motor shaft 15 and which is configured a helical toothing of a helical sun gear 32. The motor shaft toothing 30 forms one end of the motor shaft 15. The planetary gear toothing 20 and the internal toothing 24 of the internal helical wheel 28 are adapted to the helical toothing of the helical sun gear 32 to ensure engagement as optimally as possible within the helical wheel planetary gear system 26.

(14) The electric motor 14 includes a housing 34, which is closed with a first housing cover 36 and a second housing cover 38. A first bearing section 40 is arranged in the first housing cover 36 and a second bearing section 42 is arranged in the second housing cover 38, which sections support the motor shaft 15 in the housing 34. In the first embodiment, the motor shaft 15 is both radially and axially mounted in the first bearing section 40 by means of a roller bearing 44, in this case by means of a ball bearing 46. The ball bearing 46 comprises an inner ring 48 pressed onto the motor shaft 15 and an outer ring 50 which is in contact with the first housing cover 36. The motor shaft 15 is mounted in the second bearing section 42 by means of a slide bearing 52, for which purpose the slide bearing 52 is pressed onto the motor shaft 15.

(15) The motor shaft 15 has a first shaft section 54 in which the motor shaft 15 has a first motor shaft diameter D.sub.MW1. The motor shaft toothing 30 has an outer toothing diameter D.sub.V. Depending on the selected toothing, the outer toothing diameter D.sub.V can be the outside diameter. In the first embodiment shown, the outer toothing diameter D.sub.V equals the first motor shaft diameter D.sub.MW1, wherein the outer toothing diameter D.sub.V can also be dimensioned smaller than the first motor shaft diameter D.sub.MW1. Consequently, the slide bearing 52 and the ball bearing 46 can be slid over the motor shaft toothing 30, or the motor shaft toothing 30 can be passed through the slide bearing 52 and the ball bearing 46.

(16) For connecting the planetary gear system 12 with the electric motor 14, these parts are oriented such that the motor shaft axis A.sub.MW and the planetary carrier axis A.sub.PT are in alignment with each other. Then the motor shaft 15 with the motor shaft toothing 30 is inserted into the planetary gear system 12 such that the motor shaft toothing 30 is in engagement with the planetary gear toothing 20. The ring gear 22 is connected in a rotationally and axially fixed manner to the first housing cover 36, for example by laser welding. As is particularly visible in FIG. 1A, the motor-transmission arrangement 10.sub.1 comprises a spacer disc 56 with which the outer ring 50 of the ball bearing 46 is axially fixed. The ring gear 22 has an offset 58 with which the spacer disc 56 is in contact in the assembled state. The spacer disc 56 can be used to limit gear play. The electric motor 34 becomes fully functional only after the first housing cover 36 is mounted to the housing 34.

(17) FIG. 2 shows a sectional view of a second embodiment of the motor-transmission arrangement 10.sub.2 according to the present disclosure. The general structure of the motor-transmission arrangement 10.sub.1 according to the second embodiment is similar to the motor-transmission arrangement 10.sub.1 according to the first embodiment, but the motor shaft 15 has a second shaft section 60 with a second motor shaft diameter D.sub.MW2 in addition to the first shaft section 54. The second motor shaft diameter D.sub.MW2 is smaller than the first motor shaft diameter D.sub.MW1, such that the motor shaft 15 forms a step 62. The ball bearing 46 is arranged in the first shaft section 54, whereas the slide bearing 52 is arranged in the second shaft section 60. The end of the ball bearing 46 that faces the interior of the housing 34 is approximately flush with the step 62. The second shaft section 60 passes through almost the entire housing 34.

(18) FIG. 3 shows a sectional view of a third embodiment of the motor-transmission arrangement 103 according to the present disclosure. The motor shaft 15 comprises a first motor shaft portion 64 and a second motor shaft portion 66, which are connected in a rotationally fixed manner. For this purpose, the first motor shaft portion 64 forms a receiving section 68 into which the second motor shaft portion 66 is inserted. The motor shaft toothing 30 is arranged in the first motor shaft portion 64. The first motor shaft portion 64 has a greater diameter in the receiving section 68 than at the site where the motor shaft toothing 30 is arranged. The inner ring 48 of the ball bearing 46 is pressed onto the first motor shaft portion 64, such that the first bearing section 40 is arranged on the first motor shaft portion 64. The end of the ball bearing 46 that faces the interior of the housing 34 is approximately flush with the motor shaft portion 64. The second motor shaft portion 66 passes through almost the entire housing 34.

(19) FIG. 4 shows a sectional view of a fourth embodiment of the motor-transmission arrangement 104 according to the present disclosure, in which the motor shaft 15 also comprises the first motor shaft portion 64 and the second motor shaft portion 66. In this embodiment, however, the first bearing section 40 is not arranged on the first motor shaft portion 64 but on the second motor shaft portion 66. The inner ring 48 of the ball bearing 46 is pressed onto the second motor shaft portion 66 and is in contact with the first motor shaft portion 64. A spacer sleeve 70 is used to bridge the distance between the outer ring 50 and the spacer disc 56. Compared to the third embodiment of the motor-transmission arrangement 103 according to the present disclosure, the diameter of the second motor shaft portion 66 is greater in the fourth embodiment of the motor-transmission arrangement 104 according to the present disclosure.

(20) FIG. 5 shows a sectional view of a fifth embodiment of the motor-transmission arrangement 105 according to the present disclosure in the assembled state. In this embodiment, the housing 34 is clearly longer in the axial direction than in the other embodiments, such that the first housing cover 36 can completely be arranged inside the housing 34. In addition, the ring gear 22 is also partially arranged in the housing 34. The first housing cover 36 can be pressed into the housing 34. The spacer disc 56 is in contact with the outer ring 50 of the ball bearing 46. The ring gear 22 is inserted into the housing 34 until the ring gear 22 is in contact with the spacer disc 56. Then the ring gear 22 and the housing 34 can be connected, for example by crimping.

(21) FIG. 6 shows a sixth embodiment of the motor-transmission arrangement 10.sub.6 according to the present disclosure. The roller bearing 44 is arranged on the first motor shaft portion 64. Furthermore, the first housing cover 36 is injection-molded around the roller bearing 44.

(22) In all embodiments of the motor-transmission arrangement 10, the two bearing sections 36, 38 are arranged in the housing 34 of the electric motor 14, such that no bearing must be arranged in the planetary carrier 16, which simplifies assembly.

(23) The outer toothing diameter D.sub.V is not shown in FIGS. 2 to 6 for presentation reasons. The explanations given with respect to the toothing diameter D.sub.V when discussing the first embodiment of the motor-transmission arrangement 10.sub.1 apply likewise to the second to sixth embodiment of the motor-transmission arrangement 10.sub.2-10.sub.6.

(24) The embodiments 10.sub.1-10.sub.6 lead to other combination options, which have not been explicitly discussed, but which can easily be derived from these embodiments. For example, the spacer sleeve 70 shown in FIG. 4 can also be used when the motor shaft 15 is made in one piece. Also, the housing 34 shown in FIG. 5, which fully surrounds the first housing cover 36 and at least partially surrounds the ring gear, can be used regardless of the design of the motor shaft 15.

(25) FIG. 7 shows a schematic side view of a portion of a vehicle 72, which comprises an adjusting device 74 for adjusting two vehicle components that can be adjusted relative to each other. In this case, the adjusting device 74 is configured as a tailgate adjusting device 76 with which a tailgate 78 of the vehicle 72 can be adjusted relative to the rest of the vehicle 72 and thus be opened and closed. The tailgate adjustment system 76 comprises a motor-transmission arrangement 10 according to one of the embodiments described above, which arrangement is not explicitly shown in FIG. 5.

LIST OF REFERENCE SYMBOLS

(26) 10, 10.sub.1-10.sub.6 Motor-transmission arrangement 12 Planetary gear system 14 Electric motor 15 Motor shaft 16 Planetary carrier 18 Planetary gear 20 Planetary gear toothing 22 Ring gear 24 Inner toothing 26 Helical wheel planetary gear system 28 Internal helical wheel 30 Motor shaft toothing 32 Helical sun gear or helical toothing, respectively 34 Housing 36 First housing cover 38 Second housing cover 40 First bearing section 42 Second bearing section 44 Roller bearing 46 Ball bearing 48 Inner ring 50 Outer ring 52 Slide bearing 54 First shaft section 56 Spacer disc 58 Offset 60 Second shaft section 62 Step 64 First motor shaft portion 66 Second motor shaft portion 68 Receiving section 70 Spacer sleeve 72 Vehicle 74 Adjusting device 76 Tailgate adjustment system 78 Tailgate A.sub.MW Motor shaft axis A.sub.PT Planetary carrier axis A.sub.P Planetary gear axis D.sub.MW1 First motor shaft diameter D.sub.MW2 Second motor shaft diameter D.sub.V Outer toothing diameter