Gearbox arrangement for a vehicle

Abstract

Gear arrangement for a vehicle, comprising a central sun gear shaft (1) with external teeth (2) and a radial bearing (4) for supporting the sun gear shaft (1), wherein an oil inlet opening (6) for lubricating oil supply is provided on the outer diameter of the sun gear shaft (1), which is arranged in the area between the external teeth (2) and the radial bearing (4), and in the area of ​​the oil inlet opening (6) oil guide elements (7) are formed for guiding the oil exiting at the oil inlet opening (6), characterized in that the oil guide elements (7) are supported on a bearing inner ring (5) of the radial bearing (4).

Description

Field of invention

[0001] The invention relates to a transmission arrangement for a vehicle according to the type defined in more detail in the preamble of claim 1 or 7.

[0002] From DE 10 2008 000 900 A1, a planetary gear is known with a lubricant collection tray arranged laterally on a planet carrier for lubricant guidance. This tray is rotationally fixed to the planet carrier and has a hood-shaped outer contour to form an annular chamber arranged laterally next to the planet carrier. A disadvantage of this design is that the lubricant collection tray is complex to manufacture and assemble. Furthermore, the hood-shaped outer contour requires a large installation space.

[0003] KR 10 - 1 506 089 B1 shows a lubrication device for a planetary gear set in a manual transmission, in which an annular pressure spacer is installed in the output shaft and exerts a reaction force on the planetary gear set. The pressure spacer has a concave receiving chamber that opens from its inner circumferential surface towards the planetary gear set. A thrust washer is provided to control the position of a pinion relative to the carrier of the planetary gear set.

[0004] JP 2008-037355A discloses an electric drive device comprising an electric motor consisting of a stator and rotor, a reduction gearbox for transmitting the motor power, and a coaxially arranged output shaft that transmits the power from the gearbox to a driven component. The output shaft is rotatably mounted in the housing via a preloaded double-row bearing, while the rotor is rotatably mounted on the output shaft via a rotor bearing. The gearbox is mounted to transmit the power between the rotor and the output shaft.

[0005] DE 10 2012 223 234 A1 discloses a planetary gear arrangement with a planet carrier rotating around the gear axis, planet gears housed therein, a sun gear shaft with a sun gear section, and a coupling device for selectively connecting the planet carrier to a gear element rotatable relative to it. The coupling device has a coupling element carrier connected to the planet carrier, in which a first bearing arrangement for radially supporting the sun gear shaft against the coupling element carrier is housed, wherein a lubricant channel for supplying the first bearing arrangement is provided in the sun gear shaft. Summary of the invention

[0006] The invention is therefore based on the objective of proposing a gear arrangement of the aforementioned type with a simply constructed lubricating oil guide, which is simple in design and can be manufactured cost-effectively.

[0007] The problem is solved by the features of claim 1 and, alternatively, by the features of claim 7. Further advantageous embodiments will become apparent from the respective dependent claims, the description, and the drawings.

[0008] A transmission arrangement for a vehicle is proposed, featuring a central sun gear shaft with external teeth and a radial bearing for supporting the sun gear shaft. An oil inlet port for lubrication is provided on the outer diameter of the sun gear shaft, located between the external teeth and the radial bearing. Oil guides can be arranged in the area of ​​the oil inlet port to direct the oil exiting it. Since these guides are supported by an inner ring of the radial bearing, additional support elements are avoided, simplifying the design and manufacturing process.

[0009] In a particularly advantageous way, the inner bearing ring can form a mate on its outer diameter to radially support the oil lubricant. Since the inner bearing ring has a hardened, especially finely ground, surface on its outer diameter for the production of the running surfaces, this surface can simultaneously be used as a radial mate for the oil guide shell, thus avoiding additional manufacturing effort.

[0010] Preferably, the oil guides are designed as an oil guide shell arranged coaxially to the sun gear shaft, encompassing it radially on the outside and supported on the outer diameter of the bearing inner ring.

[0011] Preferably, the oil guide shell forms a concave oil guide surface on its radial inner side. Preferably, on its outer side facing away from the oil guide surface, it rests against the outer diameter of the bearing inner ring with an annular bearing surface for radial support.

[0012] In a further preferred embodiment of the invention, the oil guide shell forms a 90° arc on the concave oil guide surface, at which the oil exiting radially from the oil inlet opening on the outer diameter of the sun gear shaft is axially deflected and directed onto the external teeth of the sun gear shaft.

[0013] The oil guide tray can be manufactured from plastic particularly easily and cost-effectively.

[0014] The problem according to the invention is also solved by a transmission arrangement for a vehicle with a central sun gear shaft having external teeth and a radial bearing for supporting the sun gear shaft, wherein the oil guide elements arranged in the area between the external teeth and the radial bearing for guiding the oil exiting at the oil inlet opening are integrally formed with an inner bearing ring of the radial bearing. This eliminates the need for an additional component for oil guidance, thereby further simplifying manufacturing and assembly and further reducing costs.

[0015] According to the invention, an oil guiding contour forming the oil conductor is connected flush to the outer diameter on an axial end face of the inner bearing ring.

[0016] The inner bearing ring is preferably arranged with its inner diameter on the outer diameter of the sun gear shaft.

[0017] Preferably, the oil guides form an oil guide contour integral with the inner bearing ring, which projects axially from the inner bearing ring and covers the oil inlet opening on the outer diameter of the sun gear shaft at a radial distance from the oil guide. The oil guide contour is preferably arranged parallel to the sun gear shaft and coaxially encompasses it at a constant radial distance.

[0018] Furthermore, it is advantageous if the oil guide contour forms an annular radial oil guide surface, on which the oil exiting radially from the oil inlet opening on the outer diameter of the sun gear shaft can be guided in an axial direction onto the outer teeth of the sun gear shaft.

[0019] The transmission arrangement according to the invention can be used in a particularly advantageous way in a vehicle, wherein the transmission arrangement comprises a planetary gear for the electric drive of a driven axle of a vehicle. Brief description of the drawings

[0020] Further features of the invention will become apparent from the following description and from the drawings, which show several simplified embodiments of the invention. The drawings show: Fig. 1 a cutaway view of a transmission arrangement according to the invention for a vehicle in a first embodiment, Fig. 2 an enlarged section from Fig. 1, Fig. 3 a cutaway view of a transmission arrangement according to the invention for a vehicle in a second embodiment. Fig. 4 an enlarged section from Fig. 3. Detailed description of the drawings

[0021] In Fig. Figure 1 shows a first embodiment of a transmission arrangement according to the invention for a vehicle. The transmission arrangement has a central sun gear shaft 1 with an external toothing 2 integrally formed with it. The sun gear shaft 1 is part of a planetary gear set 3. A radial bearing 4 with an inner bearing ring 5 is provided for radial support of the sun gear shaft 1. The inner diameter of the bearing ring 5 is arranged on the outer diameter of the sun gear shaft 1. The sun gear shaft 1 is supported on a planet carrier 23 of the planetary gear set 3 via the radial bearing 4, which is designed as a four-point bearing. The planet carrier 23 is mounted on a stationary housing. The inner bearing ring 5 of the radial bearing 4 is arranged with its inner diameter on the outer diameter of the sun gear shaft 1. The inner bearing ring 5 is secured with its axially inner end face facing the planetary gear set 3 against a shoulder of the sun gear shaft 1.

[0022] For lubrication supply, an oil inlet opening 6 is provided on the outer diameter of the sun gear shaft 1, which is designed as a hollow shaft. This opening runs as a radial bore between the inner and outer diameter of the sun gear shaft 1 and communicates with a central lubricating oil supply 20 that is inserted into the sun gear shaft 1 at one end of the shaft. Fig. Figure 2 shows an enlarged section from Fig. 1 in the area of ​​the oil inlet opening 6 on the sun gear shaft 1. The oil inlet opening 6 is formed axially between the external gear teeth 2 and the radial bearing 4. Oil guides 7 are arranged in the area of ​​the oil inlet opening 6 to guide the oil exiting the oil inlet opening 6. The oil guides 7 are formed by a plastic oil guide shell arranged coaxially to the sun gear shaft 1. This shell has a central through-opening 8 through which the sun gear shaft 1 is guided with a small radial air gap. The oil guide shell, with its flat annular end face 22 formed at its axially inner end, lies opposite the axially outer flat end face of the external gear teeth 2, separated by a small axial clearance.On its radial inner surface, the oil guide shell forms an annular, circumferential, concave oil guide surface 9. Oil exiting radially from the oil inlet opening 6 on the outer diameter of the sun gear shaft 1 is guided in a 90° arc axially inwards onto the external teeth 2. On the convex outer surface of the oil guide shell facing the radial bearing 4, an annular, axially planar contact surface 10 extends radially inwards from the through-opening 8. This surface allows the oil guide shell to bear against the axially inner end face of the inner bearing ring 5. The contact surface 10 is bounded radially outwards by an axially annular, flange-like projection 11, which forms a right-angled shoulder with an annular radial bearing surface 12 on the inner diameter. This bearing surface rests on a fitting 13 formed on the flange of the inner bearing ring 5 on the outer diameter.

[0023] In Fig. 3 and Fig. Figure 4 shows a transmission arrangement according to the invention for a vehicle in a second embodiment, in which the oil guides 14 are integrated into a modified inner bearing ring 15 and are formed by an oil guide contour formed integrally with the inner bearing ring 15 of the radial bearing 4. This oil guide contour projects axially like a flange on the axially inner end face 16 of the inner bearing ring 15 and is flush with the outer diameter of the inner bearing ring 15. The oil guide contour is arranged parallel to and spaced apart from the sun gear shaft 1 and coaxially encompasses it at a constant radial distance. It covers the oil inlet opening 6 and its flat, annular end face 17, formed at the axially inner end, is spaced apart from the axially outer flat end face of the external gearing 2 by a small axial clearance.On the radial inner side, the oil guide contour forms an annular, radially inwardly oriented oil guide surface 24. The oil exiting radially from the oil inlet opening 6 on the outer diameter of the sun gear shaft 1 is guided radially at the axially inner end face 16 of the bearing inner ring 15 and axially at the oil guide surface 24 of the oil guide contour, and deflected axially inwards by 90° at the latter and directed onto the external teeth 2.

[0024] The central sun gear shaft 1 engages with the external teeth 2 with a set of planet gears 18 of the planetary gear set 3, which mesh radially on the outside with an internal toothing of a housing-fixed ring gear 19 ( Fig. 1 and Fig.3) The central sun gear shaft 1, designed as a hollow shaft, is driven at its end opposite the central lubricating oil supply 20 by an internal toothing of an electric motor (not shown). A torque transmitted by the electric motor can thus be transferred via the sun gear shaft 1 with its external toothing 2 to the planet gears 18, which are supported by the internal toothing of the ring gear 19, and via the planet carrier 23 supporting these planet gears to an output pinion 21, which interacts with a differential (not shown) of a driven axle of a vehicle. In this way, a driven axle of a vehicle can be electrically driven via the planetary gear set 3. Reference symbol list 1 Sun gear shaft 2 External teeth 3 planetary gears 4 radial bearings 5 inner bearing ring 6 Oil inlet opening 7 Oil lubricants 8 Through opening 9 Oil conduction area 10 Plant area 11 lead 12 bearing surfaces 13 Passport 14 Oil lubricants 15 inner bearing ring 16 Front 17 Front 18 planetary gears 19 Ring gear 20 Lubricating oil supply 21 output pinion 22 Front 23 planetary gear carriers 24 Oil conduction area

Claims

[1] Gear arrangement for a vehicle, comprising a central sun gear shaft (1) with external teeth (2) and a radial bearing (4) for supporting the sun gear shaft (1), wherein an oil inlet opening (6) for lubricating oil supply is provided on the outer diameter of the sun gear shaft (1), which is located in the area between the external teeth (2) and the radial bearing (4), and in the area of ​​the oil inlet opening (6) oil guide medium (7) is formed for guiding the oil exiting at the oil inlet opening (6), characterized by , that the oil lubricants (7) are supported on an inner bearing ring (5) of the radial bearing (4). [2] Gear arrangement according to claim 1, characterized by , that the inner bearing ring (5) forms a mate (13) on the outer diameter for radial support of the oil lubricant (7). [3] Gear arrangement according to one of claims 1 or 2, characterized by, that the oil guides (7) are designed as an oil guide shell arranged coaxially to the sun gear shaft (1), encompassing it radially outwards, and supported on the outer diameter of the bearing inner ring (5). [4] Gear arrangement according to claim 3, characterized by , that the oil guide shell forms a concave oil guide surface (9) on its radial inner side and rests on the outer side facing away from this with an annular bearing surface (12) on the outer diameter of the bearing inner ring (5) for radial support. [5] Gear arrangement according to claim 4, characterized by , that the oil guide shell forms a 90° arc on the concave oil guide surface (9), at which the oil exiting radially from the oil inlet opening (6) on the outer diameter of the sun gear shaft (1) can be guided in an axial direction onto the outer teeth (2) of the sun gear shaft (1). [6] Gear arrangement according to any one of claims 3 to 5, characterized by that the oil guide bowl is made of plastic. [7] Gear arrangement for a vehicle, comprising a central sun gear shaft (1) with external teeth (2) and a radial bearing (4) for supporting the sun gear shaft (1), wherein an oil inlet opening (6) for lubricating oil supply is provided on the outer diameter of the sun gear shaft (1), which is located in the area between the external teeth (2) and the radial bearing (4), and in the area of ​​the oil inlet opening (6) oil guides (14) are formed for guiding the oil exiting the oil inlet opening (6), wherein the oil guides (14) are formed integrally with a bearing inner ring (15) of the radial bearing (4), characterized by , that an oil guiding contour forming the oil media (14) is flush connected to an axial end face (16) of the bearing inner ring (15) at the outer diameter. [8] Gear arrangement according to claim 7, characterized by, that the oil guides (14) are formed by an oil guide contour on the inner bearing ring (15), which projects axially on this and covers the oil inlet opening (6) on the outer diameter of the sun gear shaft (1) radially spaced from the oil guide. [9] Gear arrangement according to one of claims 7 or 8, characterized by , that the oil guide contour forms an annular radial oil guide surface (24) on which the oil exiting radially from the oil inlet opening (6) on the outer diameter of the sun gear shaft (1) can be guided in an axial direction onto the external teeth (2) of the sun gear shaft (1).

Images