Gear rim carrier part for a two- or multi-component gearwheel and two-or multi-component gearwheel having such a gear rim carrier part

Abstract

A gear rim carrier part for a two- or multi-component gearwheel includes an annular section which revolves around an axis of rotation in the circumferential direction, a gear rim arranged radially on the outside of the annular section, and a projection which extends radially inwards from the annular section and has a radially inner free end, or the gear rim carrier part includes an annular section which revolves around an axis of rotation in the circumferential direction, a gear rim arranged radially on the inside of the annular section, and a projection which extends radially outwards from the annular section and has a radially outer free end. The projection has a first width at the radially inner free end thereof or at the radially outer free end thereof and has a second width at the opposite end thereof at the transition to the annular section.

Claims

1. A gear rim carrier part (10) for a two-component or multi-component gearwheel (46, 50), wherein the gear rim carrier part (10) comprises: an annular section (12) which revolves around an axis of rotation (D) in the circumferential direction, a gear rim (14) arranged radially on the outside of the annular section (12), and a projection (16) which extends radially inwards from the annular section (12) and has a radially inner free end (18), the projection (16) has a first width (a) at the radially inner free end (18) thereof and has a second width (b) at an opposite end thereof at a transition to the annular section (12), the projection (16) further having a first axial surface (20) and a second axial surface (22), wherein the first width (a) is smaller than the second width (b), wherein a width of the projection (16) broadens in a broadening region continuously between the first axial surface (20) and the second axial surface (22), the broadening region being between the first width (a) and the second width (b), wherein a number of protrusions (24) extending outwardly from the projection (16) along the axis of rotation (D) are arranged on the projection (16), the number of protrusions (24) comprising a first set of protrusions (24.sub.1) extending from the first axial surface (20) and a second set of protrusions (24.sub.2) extending from the second axial surface (22), and wherein the number of protrusions (24) merge with a curved transition surface (32) into the projection (16) in the broadening region.

2. The gear rim carrier part (10) according to claim 1, wherein the first set of protrusions (24.sub.1) and the second set of protrusions (24.sub.2) are arranged offset relative to one another in the circumferential direction.

3. The gear rim carrier part (10) according to claim 1, characterized in that a number of radially inner protrusions (38) and a number of radially outer protrusions (40) proceed from the first axial surface (20) and/or from the second axial surface (22).

4. The gear rim carrier part (10) according to claim 1, characterized in that two or more extensions (36) extending substantially along the axis of rotation (D) are arranged within the protrusions (24).

5. The gear rim carrier part (10) according to claim 1, wherein each of the protrusions (24) has a trapezoidal cross section.

6. The gear rim carrier part (10) according to claim 1, characterized in that the protrusions (24) have an end face (26) and/or a further end face (34) which extends parallel to a plane (E) extending perpendicular to the axis of rotation (D).

7. The gear rim carrier part (10) according to claim 1, wherein the first axial surface (20) and/or the second axial surface (22) form an axial surface angle (α) with a plane (E) extending perpendicular to the axis of rotation (D), and the protrusions (24) each have at least one end face (26) which forms an end face angle (β) with a plane (E) extending perpendicular to the axis of rotation (D), and the end face angle (β) is greater than or equal to the axial surface angle (α).

8. The gear rim carrier part (10) according to claim 7, characterized in that the protrusions (24) have a further end face (34) which extends parallel to a plane (E) extending perpendicular to the axis of rotation (D) or which forms a further end face angle (γ) with a plane (E) extending perpendicular to the axis of rotation (D).

9. The gear rim carrier part (10) according to claim 1, wherein the protrusions (24) have an outer radial surface (30) and an inner radial surface (28), wherein the outer radial surface (30) and/or the inner radial surface (28) extend parallel to the axis of rotation (D).

10. The gear rim carrier part (10) according to claim 1, characterized in that the axial surfaces (20, 22), the end faces (26), the further end faces (34), the outer radial surfaces (30) and/or the inner radial surfaces (28) are curved.

11. A two- or multi-component gearwheel (42, 50), comprising: a gear rim carrier part (10) according to claim 1, and a connecting part (49) which is connected in a form-fitting manner to the gear rim carrier part (10), wherein the connecting part (49) surrounds the projection (16).

12. The two- or multi-component gearwheel (42, 50) according to claim 11, wherein the two-component or multi-component gearwheel (42, 50) is designed as a spur gear (52).

13. The two- or multi-component gearwheel (42, 50) according to claim 11, wherein the two- or multi-component gearwheel (42, 50) comprises an insert part (54) which is connected to the connecting part (49) and is surrounded by the connecting part (49).

14. A gear rim carrier part (10) for a two-component or multi-component gearwheel (46, 50), wherein the gear rim carrier part (10) comprises: an annular section (12) which revolves around an axis of rotation (D) in the circumferential direction, a gear rim (14) arranged radially on the inside of the annular section (12), and a projection (16) which extends radially outwards from the annular section (12) and has a radially outer free end (46), wherein the projection (16) has a first width (a) at the radially outer free end (46) and has a second width (b) at an opposite end thereof at a transition to the annular section (12), the projection (16) further having a first axial surface (20) and a second axial surface (22), wherein the first width (a) is smaller than the second width (b), wherein a width of the projection (16) broadens in a broadening region continuously between the first axial surface (20) and the second axial surface (22), the broadening region being between the first width (a) and the second width (b), wherein a number of protrusions (24) extending outwardly from the projection (16) along the axis of rotation (D) are arranged on the projection (16), the number of protrusions (24) comprising a first set of protrusions (24.sub.1) extending from the first axial surface (20) and a second set of protrusions (24.sub.2) extending from the second axial surface (22), and wherein the number of protrusions (24) merge with a curved transition surface (32) into the projection (16) in the broadening region.

15. A two- or multi-component gearwheel (42, 50), comprising: a gear rim carrier part (10) according to claim 14, and a connecting part (49) which is connected in a form-fitting manner to the gear rim carrier part (10), wherein the connecting part (49) surrounds the projection (16).

16. The two- or multi-component gearwheel (42, 50) according to claim 15, wherein the two-component or multi-component gearwheel (42, 50) is designed as a ring gear (44).

Description

(1) Exemplary embodiments of the invention are explained in more detail in the following with reference to the attached drawings. The drawings show the following:

(2) FIG. 1 shows a sectional view of a first exemplary embodiment of a gear rim carrier part according to the invention;

(3) FIG. 2 shows a sectional view of a second exemplary embodiment of a gear rim carrier part according to the invention;

(4) FIG. 3 shows a sectional view of a third exemplary embodiment of a gear rim carrier part according to the invention;

(5) FIG. 4 shows a sectional view of a fourth exemplary embodiment of a gear rim carrier part according to the invention;

(6) FIG. 5 shows a sectional view of a fifth exemplary embodiment of a gear rim carrier part according to the invention;

(7) FIG. 6 shows a sectional view of a sixth exemplary embodiment of a gear rim carrier part according to the invention;

(8) FIG. 7 shows a sectional view of a seventh exemplary embodiment of a gear rim carrier part according to the invention;

(9) FIG. 8 shows a sectional view of an eighth exemplary embodiment of a gear rim carrier part according to the invention;

(10) FIG. 9 shows a schematic sectional view of a two-component gearwheel according to the invention in the form of a ring gear; and

(11) FIG. 10 shows a side view of a multi-component gearwheel according to the invention in the form of a spur gear.

(12) FIGS. 1 to 8 show various exemplary embodiments of a gear rim carrier part 10 according to the invention, in sectional view in each case, which can be used for a two-component gearwheel 42 or a multi-component gearwheel 50 (see FIGS. 9 and 10). The two-component or multi-component gearwheel 42, 50 is arranged concentrically with respect to an axis of rotation D about which the two-component or multi-component gearwheel 42, 50 can rotate, depending on the design. The sectional plane of the sectional views of FIGS. 1 to 8 extends through the axis of rotation D. Only one half-section of the gear rim carrier part 10 is shown.

(13) According to the first exemplary embodiment shown in FIG. 1, the gear rim carrier part 10.sub.1 according to the invention comprises an annular section 12 which extends annularly around the axis of rotation D in the circumferential direction. Radially on the outside, the annular section 12 forms a gear rim 14 with which the gear rim carrier part 10 or the two-component or multi-component gearwheel 42, 50 provided with the gear rim carrier part 10 can be brought into meshing engagement with a gearwheel (not shown here). Depending on the design, the two-component or multi-component gearwheel 42, 50 can be designed as a spur gear, a helical gear or worm gear and can be brought into engagement with a correspondingly designed gearwheel.

(14) The gear rim carrier part 10.sub.1 according to the invention furthermore has a projection 16 which, proceeding from the annular section 12, extends radially inwards towards the axis of rotation D and forms a radially inner free end 18. The projection 16 has a first width a at the radially inner free end 18, which extends parallel to the axis of rotation D. The projection 16 has a second width b at the transition to the annular section 12, which extends parallel to the axis of rotation D. Proceeding from the radially inner free end 18, the projection 16 broadens continuously from the first width a to the second width b. In the first exemplary embodiment of the gear rim carrier part 10.sub.1, the width increases uniformly, so the projection 16 has a funnel shape.

(15) The projection 16 has a first axial surface 20 and a second axial surface 22, each of which forms an axial surface angle α of the same size with a plane E extending perpendicular to the axis of rotation D. A number of protrusions 24 proceed from the first axial surface 20 and the second axial surface 22—first protrusions 24.sub.1 proceeding from the first axial surface 20 and second protrusions 24.sub.2 proceeding from the second axial surface 22 in the first exemplary embodiment. The first protrusions 24.sub.1 and the second protrusions 24.sub.2 have the same dimensions but have different directions with respect to the axis of rotation D. In addition, the first protrusions 24.sub.1 and the second protrusions 24.sub.2 are each arranged at a distance from one another in the circumferential direction so that there is a gap between two adjacent protrusions 24.sub.1, 24.sub.2. In addition, the first protrusions 24.sub.1 and the second protrusions 24.sub.2 are arranged offset relative to one another in the circumferential direction.

(16) The protrusions 24.sub.1, 24.sub.2 are substantially trapezoidal and each comprise an end face 26, here a first end face 26.sub.1 and a second end face 26.sub.2, an inner radial surface 28 and an outer radial surface 30. The inner radial surface 28 and the outer radial surface 30 extend parallel to one another and parallel to the axis of rotation D, while the end face 26 forms an end face angle β with a plane E extending perpendicular to the axis of rotation D. In the first exemplary embodiment, the end face angle β is greater than the axial surface angle α.

(17) The protrusions 24 merge radially on the outside with a curved transition surface 32 into the projection 16.

(18) In the second exemplary embodiment of the gear rim carrier part 10.sub.2, which is illustrated in FIG. 2, the protrusions 24 each have a further end face 34 which forms a further end face angle γ with a plane E extending perpendicular to the axis of rotation D. In the second exemplary embodiment, the further end face 34 extends parallel to the plane E extending perpendicular to the axis of rotation D, while the further end face angle γ is equal to zero. However, it can just as easily deviate from zero and be less or greater than the axial surface angle α. In addition, the further end face angle γ can also be less or greater than the end face angle β.

(19) The two further end faces 34 of the first protrusions 24.sub.1 and of the second protrusions 24.sub.2 have a distance c, which in the second exemplary embodiment is equal to the second width b.

(20) The third embodiment of the gear rim carrier part 10.sub.3 shown in FIG. 3 is largely similar to the second exemplary embodiment of the gear rim carrier part 10.sub.2, but the first axial surface 20 and the second axial surface 22 are curved, so no clear axial surface angle α can be defined.

(21) The fourth exemplary embodiment of the gear rim carrier part 10.sub.4 shown in FIG. 4 is largely identical to the first exemplary embodiment of the gear rim carrier part 10.sub.1, the end face angle β being almost equal to the axial surface angle α. Therefore, in the fourth exemplary embodiment, the protrusions 24 are approximately parallelogram-shaped.

(22) The fifth exemplary embodiment of the gear rim carrier part 10.sub.5 illustrated in FIG. 5 is largely identical to the second embodiment of the gear rim carrier part 10.sub.2, but the distance c between the two further end faces 34 is greater than the second width b.

(23) The protrusions 24 of the gear rim carrier part 10.sub.6 according to the sixth exemplary embodiment have a first extension 36.sub.1 and a second extension 36.sub.2 which extend substantially along the axis of rotation D. The end face 26 of the first extension 36.sub.1 is curved, whereas the end face 26 of the second extension 36.sub.2 has an end face angle β which is greater than the axial surface angle α. The further end face 34 is likewise curved. The inner radial surface 28 and the outer radial surface 30 extend parallel to one another and parallel to the axis of rotation D. The extensions 36.sub.1, 36.sub.2 are separated from one another by a depression 37, but the depression 37 does not reach as far as the axial surfaces 20, 22.

(24) The protrusions 24 of the gear rim carrier part 10.sub.7 according to the seventh exemplary embodiment also have the first extension 36.sub.1 and the second extension 36.sub.2, but the first extension 36.sub.1 has a first end face 26.sub.1 and the second extension 36.sub.2 has a second end face 26.sub.2, which run parallel to one another.

(25) In the eighth exemplary embodiment, the gear rim carrier part 10.sub.8 has a radially inner protrusion 38 and a radially outer protrusion 40. The radially inner protrusion 38 is arranged on a section 48 of the projection 16 in which the width of the projection 16 does not change.

(26) FIG. 9 shows an exemplary embodiment of a two-component gearwheel 42 which is designed as a ring gear 44. The gear rim 14 of the gear rim carrier part 10 is therefore arranged radially on the inside of the annular section 12, while the projection 16 extends radially outwards from the annular section 12 and has a radially outer free end 46. A connecting part 49 is connected to the gear rim carrier part 10 in that it is injection-molded around the projection 16.

(27) The gear rim carrier part 10 has the already mentioned section 48 in which the width of the projection 16 does not change. A radially outer protrusion 40 is arranged in said section 48. A radially inner protrusion 38 has a curved end face 26 and a curved inner radial surface 28.

(28) FIG. 10 shows a side view of a multi-component gearwheel 50 (in this case a three-component gearwheel 50) in the form of a spur gear 52. An embodiment of the multi-component gearwheel 50 as a helical gear or worm gear (not shown) is also conceivable. The three-component gearwheel 50 comprises a gear rim carrier part 10 according to one of the exemplary embodiments discussed above, on the annular section 12 of which a gear rim 14 is arranged radially on the outside. In this case, the connecting part 49 is arranged radially inwards from the gear rim carrier part 10 and is connected thereto. Furthermore, the three-component gearwheel 50 comprises an insert part 54 which is arranged radially inwards from the connecting part 49 and is connected thereto. The insert part 54 forms a hub 56 with which the spur gear 52 can be connected to a shaft (not shown here).

LIST OF REFERENCE SIGNS

(29) 10 Gear rim carrier part 10.sub.1-10.sub.8 Gear rim carrier part 12 Annular section 14 Gear rim 16 Projection 18 Inner free end 20 First axial surface 22 Second axial surface 24 Protrusions 24.sub.1 First protrusions 24.sub.2 Second protrusions 26 End face 26.sub.1 First end face 26.sub.2 Second end face 28 Inner radial surface 30 Outer radial surface 32 Curved transition surface 34 Further end face 36 Extension 36.sub.1 First extension 36.sub.2 Second extension 37 Depression 38 Radially inner protrusion 40 Radially outer protrusion 42 Two-component gearwheel 44 Ring gear 46 Radially outer free end 48 Section 49 Connecting part 50 Multi-component gearwheel 52 Spur gear 54 Insert part 56 Hub D Axis of rotation α Axial surface angle β End face angle γ Further end face angle