Hybridmodul

Abstract

Hybrid module comprising an electric machine with rotor (3) and rotor carrier (4) and a planetary gear (7) having a ring gear (8), wherein the rotor carrier (4) is connected to the ring gear (8) in a rotationally fixed manner, wherein the ring gear (8) is designed as a separate part and is connected to the rotor carrier (4) via a drive tooth (11), characterized in that the ring gear (8) is axially fixed relative to the rotor carrier (4) via a snap ring (12).

Description

[0001] The invention relates to a hybrid module according to the preamble of claim 1 - known from DE10 2008 040 495 A1 of the applicant.

[0002] German patent DE 10 2008 040 495 A1 discloses a hybrid module for a hybrid drive system of a motor vehicle. The hybrid module comprises an electric machine with a rotor, which drives a base gearbox via a planetary gear set. The rotor includes a rotor carrier on which a laminated core, attached by means of an interference fit, is arranged as an armature. The planetary gear set includes a ring gear that is integrated into the rotor carrier, i.e., formed integrally with the rotor carrier – the internal teeth of the ring gear are thus directly machined into the rotor carrier. Due to the interference fit being located outside the internal teeth of the ring gear, stresses can occur that extend into the area of ​​the internal teeth. This can result in additional stress on the teeth of the ring gear or the meshing between the ring gear and the planet gears.

[0003] The object of the present invention is to create a connection between the rotor carrier and the ring gear in a hybrid module of the type mentioned above, whereby the tooth engagement remains as free as possible from external stress influences.

[0004] The object of the invention is solved by the features of claim 1. Advantageous embodiments are described in the dependent claims.

[0005] According to the invention, the ring gear is designed as a separate component and is connected to the rotor carrier via a drive tooth. The ring gear, which is part of the planetary gear set and meshes with it, is thus decoupled from the rotor carrier and therefore no longer subject to the stresses resulting from the press fit. The meshing of the ring gear with the planet gears of the planetary gear set is thus not disturbed by external stress influences, meaning that the efficiency of the meshing is improved and noise generation is reduced.

[0006] In a preferred embodiment, the drive teeth on the ring gear are designed as internal teeth and on the rotor carrier as external teeth. This means that the drive teeth are located on the same side as the running teeth of the ring gear, so that the outer circumference of the ring gear remains smooth.

[0007] In a further preferred embodiment, the running teeth and the drive teeth are arranged at opposite ends of the ring gear. Preferably, a relief groove is left between the drive teeth and the running teeth, i.e., an annular groove-like recess in the region of the tooth root diameter.

[0008] According to another preferred embodiment, the drive teeth and the running teeth have the same tooth profile. This offers the advantage that both gear teeth can be manufactured with the same tool and optionally in a single operation. This also results in cost savings.

[0009] According to a further preferred embodiment, the rotor carrier has a cylindrical recess on its inner side into which the ring gear can be inserted, leaving a radial gap. The ring gear can thus be joined to the rotor carrier in the axial direction, creating a plug-in connection. The radial gap ensures decoupling of the ring gear from the rotor carrier, and in particular from the press fit arranged on the rotor carrier.

[0010] According to another preferred embodiment, the rotor carrier has a rotor hub via which a plug connection, designed as a drive tooth, is established with the ring gear. This results in a compact design for the hybrid module, since the plug connection, i.e., the introduction of the rotor torque into the ring gear, is located in an area where unused installation space is available.

[0011] In another preferred embodiment, the ring gear is axially fixed to the rotor carrier by a snap ring. This ensures axial securing of the ring gear in the rotor carrier or on the rotor hub in both directions using simple, space-saving means.

[0012] An embodiment of the invention is illustrated in the drawing and is described in more detail below, whereby further features and / or advantages may become apparent from the description and / or the drawing. The drawing shows... Fig. 1. A section of a hybrid module in an axial section, Fig. 2 the hybrid module in an exploded view with ring gear and snap ring and Fig. 3 A detailed representation of the ring gear and the rotor carrier.

[0013] Fig. Figure 1 shows an axial section of a hybrid module 1, which is connected to a basic transmission of a motor vehicle (not shown) and comprises an electric machine. The electric machine has a rotor 3, which is mounted via a rotor carrier 4 relative to a housing (not shown) of the hybrid module 1. The rotor carrier 4, which is sleeve-like, has a cup-shaped rotor hub 5, which is connected to the rotor carrier 4 to form a single component. A laminated core 6 is arranged on the rotor carrier 4 and is press-fitted to it. The laminated core 6 forms the armature of the electric machine 2 and transmits the motor torque to the rotor carrier 4 and the rotor hub 5. A planetary gear set 7 is associated with the electric machine, through which the rotor 3 drives the basic transmission of the motor vehicle (not shown).The planetary gear set 7 comprises a ring gear 8, meshing planet gears, and a sun gear. The ring gear 8, which serves as the drive element, is connected to the rotor hub 5 via a drive tooth 11, so that the motor torque of the electric machine is positively transmitted to the ring gear 8 and thus to the planetary gear set 7. The ring gear 8 is secured against axial displacement relative to the rotor hub 5 by a snap ring 12.

[0014] Fig. Figure 2 shows an exploded view of the hybrid module 1, with the ring gear 8 and the snap ring 12 depicted as separate parts. The rotor hub 5 is visible on the hybrid module 1, which has a drive tooth 11a at its end face. The ring gear 8 has two adjacent internal teeth on its inner circumference: the drive tooth 11b, which engages with the external tooth 11a, and a running tooth 13, which engages with the planet gear. The snap ring 12 has an eyelet 12a, which serves for the assembly and disassembly of the snap ring 12.

[0015] Fig.Figure 3 shows an enlarged view of the ring gear 8 in conjunction with the rotor hub 5. The helical gear teeth 13, which mesh with the planetary gear 7, are visible on the right side of the drawing. On the left side of the drawing is the drive gear 11b, which engages with the external gear teeth 11a of the rotor hub 5. An annular undercut 14 is provided in the ring gear 8 between the drive gear 11b and the gear teeth 13; that is, this area is recessed. The arrangement of the two gear teeth 11b and 13 on the inner circumference of the ring gear 8 offers the advantage that both gear teeth can be manufactured with the same tool and preferably in a single operation. The snap ring 12 covers a groove in the ring gear 8 on one side and a groove in the rotor hub 5 on the other, thus providing axial fixation in both directions.The rotor carrier 4 has a recess 4a on its inner circumference, i.e., a region of increased inner diameter. The recess 4a partially accommodates the ring gear 8, but a radial gap s remains between the rotor carrier 4 and the ring gear 8 – thus, there is no physical contact. Therefore, the ring gear 8 and the rotor carrier 4 are stress-decoupled from each other.

[0016] Further features of the invention result from the following aspects: 1. Hybrid module comprising an electric machine with rotor (3) and rotor carrier (4) and a planetary gear (7) having a ring gear (8), wherein the rotor carrier (4) is connected to the ring gear (8) in a rotationally fixed manner, characterized in that the ring gear (8) is designed as a separate part and is connected to the rotor carrier (4) via a drive tooth (11). 2. Hybrid module according to aspect, wherein the drive toothing (11) on the ring gear (8) is designed as internal toothing (11b) and on the rotor carrier (4, 5) as external toothing (11a). 3. Hybrid module according to aspect 1 or 2, wherein the ring gear (8) has a running tooth (13) and the drive tooth (11b) and the running tooth (13) are arranged at opposite ends of the ring gear (8). 4. Hybrid module according to aspect 3, wherein a relief groove (14) is left between the drive toothing (11b) and the running toothing (13). 5. Hybrid module according to aspect 3 or 4, wherein the drive gear (11b) and the running gear (13) have the same gear profile. 6. Hybrid module according to one of claims 1 to 5, wherein the rotor carrier (4) has a cylindrical recess (4a) and the ring gear (8) is inserted into the recess (4a), wherein a radial gap (s) is left between the ring gear (8) and the recess (4a). 7. Hybrid module according to one of aspects 1 to 6, wherein the rotor carrier (4) has a rotor hub (5) which forms a plug connection with the ring gear (8) designed as a drive tooth (11). 8. Hybrid module according to one of aspects 1 to 7, wherein the ring gear (8) is axially fixed relative to the rotor carrier (4) or the rotor hub (5) via a snap ring (12). Reference sign 1 hybrid module 3 Rotor 4 rotor carriers 4a Exclusion 5 Rotor hub 6 sheet metal package 7 planetary gears 8 Ring gear 11 Drive gear 11a Drive gear (rotor hub) 11b Drive gear (ring gear) 12 snap rings 12a eyelet 13 Running gear 14 Free stitch radial gap

Claims

[1] Hybrid module comprising an electric machine with rotor (3) and rotor carrier (4) and a planetary gear (7) having a ring gear (8), wherein the rotor carrier (4) is non-rotatably connected to the ring gear (8), wherein the ring gear (8) is designed as a separate part and is connected to the rotor carrier (4) via a drive tooth (11), characterized by , that the ring gear (8) is axially fixed relative to the rotor carrier (4) by means of a snap ring (12). [2] Hybrid module according to claim 1, characterized by , that the ring gear (8) has a running tooth (13) and that the drive tooth (11b) and the running tooth (13) are arranged at opposite ends of the ring gear (8). [3] Hybrid module according to claim 2, characterized by , that a relief groove (14) is left between the drive tooth (11b) and the running tooth (13). [4] Hybrid module according to claim 2 or 3, characterized by, that the drive teeth (11b) and the running teeth (13) have the same tooth profile.

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