Ring gear carrier and assembly

Abstract

The invention relates to a ring gear carrier (20) for the transmission of a vehicle electric drive, comprising a main part (22), which has an inner toothing (38) for radially securing a ring gear (14) in a form-fitting manner and an outer toothing (42) for radially securing the ring gear carrier (20) in a housing (12) in a form-fitting manner such that the ring gear (14) can be secured to the housing (12) so as to rotate therewith by means of the ring gear carrier (20), and comprising axial securing structures (24) for axially securing the ring gear carrier (20), said securing structures extending away from the main part (20) in the axial direction (A). The invention additionally relates to an assembly (10) comprising such a ring gear carrier (20).

Description

[0001] Ring gear carrier and assembly

[0002] The invention relates to a ring gear carrier for a transmission of a vehicle electric drive. Furthermore, the invention relates to an assembly for a transmission of a vehicle electric drive, comprising a housing, a ring gear, and such a ring gear carrier.

[0003] Such ring gear carriers are known.

[0004] They are intended for use in the gearbox of a vehicle's electric drive to support a ring gear in the gearbox housing.

[0005] One challenge is to design the ring gear carrier in such a way that the ring gear can be reliably mounted on the housing by means of the ring gear carrier and that assembly can be carried out with little effort.

[0006] The object of the invention is therefore to provide a ring gear carrier for a transmission of a vehicle electric drive that provides effective support for a ring gear in the transmission housing and can be assembled with little effort. The object of the invention is further to provide an assembly for a transmission of a vehicle electric drive with such a ring gear carrier.

[0007] The object is achieved by a ring gear carrier for a transmission of a vehicle electric drive, with a base body which has an internal toothing for the positive radial fastening of a ring gear and an external toothing for the positive radial fastening of the ring gear carrier in a housing, so that the ring gear can be fastened to the housing in a rotationally fixed manner by means of the ring gear carrier, and axial fastening structures for the axial fastening of the ring gear carrier, which extend in the axial direction away from the base body.

[0008] For the purposes of the invention, an external toothing or an internal toothing is a structure of any design that is configured to ensure a positive connection for a rotationally fixed coupling. In particular, the external toothing and / or the internal toothing are of regular design.

[0009] It was discovered that this design allows a ring gear to be reliably mounted or secured in the housing of a transmission of a vehicle's electric drive by means of the ring gear carrier. The internal gearing effectively secures the ring gear against rotation about the longitudinal axis of the ring gear, while the external gearing reliably secures the ring gear carrier in the housing. The axial fastening structures absorb the operating forces in the axial direction and ensure defined positioning during the assembly process, allowing this to be carried out with minimal effort.

[0010] In one embodiment, the axial mounting structures are formed by at least two, preferably at least three support legs spaced apart from one another in the circumferential direction. In this way, axial loads can be effectively supported or absorbed during operation. Furthermore, the space between the support legs provides room for additional components of the transmission, allowing for a particularly compact design.

[0011] Additionally or alternatively, the axial fastening structures can each have a fastening opening configured to fasten the ring gear carrier to a support or the housing by means of fastening means. This allows the ring gear carrier to be fastened reliably and with minimal effort.

[0012] In a further embodiment, the internal toothing of the ring gear carrier is arranged on a first axial section, and the external toothing of the ring gear carrier is arranged on a second axial section. In this case, the inner diameter of the first section is smaller than the inner diameter of the second section and / or the outer diameter of the first section is smaller than the outer diameter of the second section.

[0013] Furthermore, the ring gear carrier can have a region axially adjacent to the internal toothing, which forms an axial stop for the ring gear, in particular for an external toothing of the ring gear, in order to axially secure the ring gear.

[0014] According to one embodiment, the ring gear carrier is designed in one piece and / or as a molded part made of sheet metal.

[0015] To achieve the above-mentioned object, the invention also provides an assembly for a transmission of a vehicle electric drive, comprising a housing, a ring gear, and a ring gear carrier according to the invention with the aforementioned advantages. The ring gear is rotationally fixed to the housing by means of the ring gear carrier.

[0016] The assembly may have a securing element by means of which the ring gear is axially fastened to the ring gear carrier, in particular wherein the securing element is a retaining ring.

[0017] Additionally or alternatively, the ring gear carrier may have a natural frequency that differs from a natural frequency of the housing and a natural frequency of the ring gear. In this way, the ring gear carrier creates an acoustic impedance jump between the ring gear and the housing, so that the assembly has advantageous acoustic properties, in particular, low noise generation.

[0018] According to a further embodiment, the ring gear has external teeth that are complementary to the internal teeth of the ring gear carrier and mesh with them. Additionally or alternatively, the housing can have internal teeth that are complementary to the external teeth of the ring gear carrier and mesh with them.

[0019] Further advantages and features are evident from the following description and the attached drawings. These show:

[0020] - Figure 1 shows a schematic sectional view of an inventive

[0021] Assembly with a ring gear carrier according to the invention,

[0022] - Figure 2 shows in a perspective view the ring gear carrier from

[0023] Figure 1 ,

[0024] - Figure 3 shows the ring gear carrier from Figure 1 in a bottom view, and

[0025] - Figure 4 shows a side view of the ring gear carrier from Figure 1.

[0026] Figure 1 shows an assembly 10 with a housing 12, a ring gear 14, and a ring gear carrier 20 with a longitudinal axis R.

[0027] The assembly 10 is part of a transmission of a vehicle

[0028] Electric drive. The ring gear 14 is, in particular, part of a planetary gear that is part of the transmission of the vehicle's electric drive or forms this transmission.

[0029] In this context, the longitudinal axis R forms a fixed or housing-fixed axis of the planetary gear.

[0030] In the present embodiment, the ring gear carrier 20 is a one-piece bent sheet metal part.

[0031] In principle, however, the ring gear carrier 20 can be made of any material.

[0032] Additionally or alternatively, the ring gear carrier 20 may be formed from several parts in an alternative embodiment.

[0033] The ring gear carrier 20 has an annular base body 22 (see Figure 2) and three axial fastening structures 24 in the form of support legs 26, which are spaced apart from one another in a circumferential direction U and extend away from the base body 22 in the axial direction A and each end in a fastening section 28.

[0034] In an alternative embodiment, the ring gear carrier 20 may have any number of axial fastening structures 24, in particular at least two.

[0035] The fastening sections 28 are designed as radial tabs with a fastening opening 30.

[0036] The ring gear carrier 20 is fastened to a carrier 34 via the fastening sections 28 by means of fastening means 32, such as screws or bolts, which extend through the fastening openings 30.

[0037] In the present embodiment, the carrier 34 is part of the housing 12.

[0038] In an alternative embodiment, the carrier 34 is connected directly or indirectly to the housing 12. In this way, the ring gear carrier 20 is arranged and secured relative to the housing 12 in a defined manner in the axial direction A via the fastening sections 28.

[0039] The base body 22 has a first axial section 36 with an internal toothing 38 and a second axial section 40 with an external toothing 42, which is arranged between the first axial section 36 and the fastening sections 28.

[0040] The first axial section 36 has an inner diameter di (see Figure 3) which is smaller than an inner diameter d2 of the second axial section 40.

[0041] Furthermore, an outer diameter Di of the first axial section 36 (see Figure 4) is smaller than an outer diameter D2 of the second axial section 40.

[0042] The internal toothing 38 and the external toothing 42 are radial toothings, ie the teeth 44 of the internal toothing 38 and external toothing 42 of the ring gear carrier 20 extend from the tooth root to the tooth tip in the radial direction (see Figure 3).

[0043] In the illustrated embodiment, the internal toothing 38 has a smaller number of teeth 44 than the external toothing 42.

[0044] In principle, the internal toothing 38 and the external toothing 42 can each have any number of teeth 44, in particular the same number of teeth 44, which offers advantages in manufacturing.

[0045] The ring gear 14 has external teeth 46 that are complementary to the internal teeth 38 of the ring gear carrier 20 and mesh with them. Thus, the ring gear 14 is positively coupled to the ring gear carrier 20 in a rotationally fixed manner in the circumferential direction U.

[0046] For axially securing the ring gear 14, the ring gear carrier 20 has a region 48 axially adjacent to the internal toothing 38, which is formed by a runout of the internal toothing 38 and forms an inner axial stop 50 for the external toothing 46 of the ring gear 14. Furthermore, the assembly 10 has a securing element 52 in the form of a securing ring, which is arranged in a radially inner circumferential groove 54 in the first axial section 36 and bears against an end face 56 of the ring gear 14.

[0047] In this way, the ring gear 14 is fixed in a defined manner in the axial direction A between the securing element 52 and the inner axial stop 50.

[0048] In order to simplify the assembly of the ring gear 14, the internal toothing 38 of the ring gear carrier 20 extends to an axial end 58 of the ring gear carrier 20, whereby the ring gear 14 can be inserted coaxially into the ring gear carrier 20 in the axial direction A up to the inner axial stop 50 before the locking element 52 is inserted to axially secure the ring gear 14.

[0049] In an alternative embodiment, the ring gear 14 can be axially fastened to the ring gear carrier 20 in any desired manner, in particular by means of any desired securing element 52, for example a screw.

[0050] Furthermore, the housing 12 has an internal toothing 60 that is complementary to the external toothing 42 of the ring gear carrier 20 and meshes therewith. In this way, the housing 12 is positively coupled to the ring gear carrier 20 in a rotationally fixed manner in the circumferential direction U.

[0051] In the axial direction A, the housing 12 rests against the axial end 58 of the ring gear carrier 20 via a first stop portion 62, which forms an axial stop 64 for the ring gear carrier 20 and ensures a defined axial arrangement of the housing 12 relative to the ring gear carrier 20.

[0052] In the present embodiment, in which the outer diameter D2 of the second axial section 40 is larger than the outer diameter Di of the first axial section 36, the ring gear carrier 20 has a stepped shoulder 66 which forms an outer axial stop 68 and against which the housing 12 bears in the axial direction A via a second stop section 70. In an alternative embodiment, the housing 12 can bear against the ring gear carrier 20 in the axial direction A via the first stop section 62 or the second stop section 70.

[0053] Because the ring gear carrier 20 is rigidly connected to the housing 12 via the carrier 34, in a further alternative embodiment no axial stop can be provided against which the housing 12 rests in the axial direction A on the ring gear carrier 20 or on the base body 22.

[0054] In principle, an axial fit of the housing 12 on the ring gear carrier 20 or on the base body 22 facilitates the assembly of the assembly 10 and improves its rigidity, whereby greater loads can be absorbed by the assembly 10.

[0055] In this context, the housing 12 and the ring gear 14 each have a natural frequency that differs from the natural frequency of the ring gear carrier 20. Thus, the ring gear carrier 20 provides an impedance jump that acoustically decouples the ring gear 14 from the housing 12.

[0056] Furthermore, the radial compliance of the ring gear carrier 20 can be determined via the geometry of the ring gear carrier 20, for example the wall thickness of the base body 22.

[0057] In this way, a ring gear carrier 20 and an assembly 10 with a ring gear carrier 20 are provided, via which the ring gear 14 is mounted or arranged in a rotationally fixed manner and in a defined axial position relative to the housing 12.

[0058] Furthermore, assembly 10 can be assembled with little effort.

[0059] In particular, the complete planetary gear, with the exception of the sun gear, can be pre-assembled into a gear cover or housing 12 by means of the assembly 10, which greatly simplifies the assembly of the gear to the vehicle's electric drive.

[0060] The invention is not limited to the embodiment shown. In particular, individual features of one embodiment can be combined arbitrarily with features of other embodiments, in particular independently of the other features of the corresponding embodiments.

Claims

Patent claims 1. Ring gear carrier (20) for a transmission of a vehicle electric drive, with a base body (22) which has an internal toothing (38) for the positive radial fastening of a ring gear (14) and an external toothing (42) for the positive radial fastening of the ring gear carrier (20) in a housing (12), so that the ring gear (14) can be fastened to the housing (12) in a rotationally fixed manner by means of the ring gear carrier (20), and axial fastening structures (24) for the axial fastening of the ring gear carrier (20), which extend in the axial direction (A) away from the base body (20).

2. Ring gear carrier (20) according to claim 1, characterized in that the axial fastening structures (24) are formed by at least two, preferably at least three support legs (26) spaced apart from one another in the circumferential direction (U).

3. Ring gear carrier (20) according to claim 1 or 2, characterized in that the axial fastening structures (24) each have a fastening opening (30) which are designed to fasten the ring gear carrier (20) to a carrier (34) or the housing (12) by means of fastening means (32).

4. Ring gear carrier (20) according to one of the preceding claims, characterized in that the internal toothing (38) of the ring gear carrier (20) is arranged on a first axial section (36) and the external toothing (42) of the ring gear carrier (20) is arranged on a second axial section (40), wherein the internal diameter (di) of the first section (36) is smaller than the internal diameter (d2) of the second section (40) and / or wherein the external diameter (Di) of the first section (36) is smaller than the external diameter (D2) of the second section (40).

5. Ring gear carrier (20) according to one of the preceding claims, characterized in that the ring gear carrier (20) has a region (48) axially adjacent to the internal toothing (38), which forms an axial stop (50) for the ring gear (14), in particular for an external toothing (46) of the ring gear 6. Ring gear carrier (20) according to one of the preceding claims, characterized in that the ring gear carrier (20) is designed in one piece and / or as a molded part made of sheet metal.

7. An assembly (10) for a transmission of a vehicle electric drive, comprising a housing (12), a ring gear (14) and a ring gear carrier (20) according to one of the preceding claims, wherein the ring gear (14) is rotationally fixed to the housing (12) by means of the ring gear carrier (20).

8. Assembly (10) according to claim 7, characterized in that the assembly (10) has a securing element (52) by means of which the ring gear (14) is axially fastened to the ring gear carrier (20), in particular wherein the securing element (52) is a securing ring.

9. Assembly (10) according to claim 7 or 8, characterized in that the ring gear carrier (20) has a natural frequency which differs from a natural frequency of the housing (12) and a natural frequency of the ring gear (14).

10. Assembly (10) according to one of claims 7 to 9, characterized in that the ring gear (14) has an external toothing (46) which is designed to be complementary to the internal toothing (38) of the ring gear carrier (20) and is in engagement with it, and / or the housing (12) has an internal toothing (60) which is designed to be complementary to the external toothing (42) of the ring gear carrier (20) and is in engagement with it.

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