STORAGE ARRANGEMENT

Description

[0001] The invention relates to a transmission with a main transmission of a motor vehicle, with a bearing arrangement for the transmission, with a shaft, a transmission gear operatively connected to the shaft, which transmission gear is operatively connectable to an input shaft of the main transmission, and a first and a second bearing for supporting the shaft, according to the preamble of claim 1.

[0002] Furthermore, the invention relates to a motor vehicle with the transmission.

[0003] A variety of hybrid transmissions are known from the prior art and are used in hybrid vehicles. Hybrid transmissions often have the problem that the torque or power delivered by the electric motor is insufficient for the desired driving operation, making it necessary to increase the torque or power of the electric motor. This can be achieved by using a larger electric motor, although the available installation space is limited, which restricts the size of the electric motor. To still increase the torque or power, it is known to actively connect the electric motor to the input shaft of the main transmission by means of a transmission gear.

[0004] DE 10 2014 202 621 A1 discloses a transmission with a hybrid module and a main transmission. A shaft, which is non-rotatably connected to the electric motor of the hybrid module, is operatively connected to the input shaft of the main transmission via a planetary gear. The shaft is supported by two bearings that are opposite each other with respect to the planetary gear. The transmission has the disadvantage of being complex to assemble.

[0005] JP 2005 212494 A2 describes a hybrid vehicle drive device with a generator whose rotor is driven by an internal combustion engine, a planetary gear set for distributing the output torque of the internal combustion engine between the generator and an output shaft, and a motor for driving the output shaft. The planetary gear set is arranged between the generator and the motor. The rotor of the generator is mounted on a housing extension that extends along the generator axis.

[0006] JP 2009 220771 A describes a generator with a planetary gear set arranged on an output shaft of an internal combustion engine. The planetary gear set increases the engine's speed and transmits the increased speed to a rotor of the generator.

[0007] US 2013 / 086798 A1 describes a method for assembling a hybrid transmission. The transmission and an input shaft are mounted in a housing, a bearing is inserted into a pump housing, and the pump housing is attached to a pump plate. The housing is then guided along the pump plate, a stator shaft is inserted onto the pump housing over the input shaft, and a rotor shaft and rotor hub are installed over the stator shaft.

[0008] The object of the invention is to provide a gearbox with a bearing arrangement by means of which assembly of the gearbox is possible in a simple manner.

[0009] The object is achieved by the transmission of the type mentioned at the outset, which is characterized in that the first bearing and the second bearing are arranged in a region of the bearing arrangement which extends from an axial normal plane of the transmission gear in the same direction.

[0010] The transmission according to the invention offers the advantage that the transmission gear and the shaft can be easily assembled with the main transmission. Unlike prior art designs, the bearings do not need to extend over the transmission gear to achieve a sufficient bearing base, but rather both bearings are arranged in the same area. Furthermore, the bearing arrangement has a precise and wide bearing base, which has a beneficial effect on bearing efficiency.

[0011] A main transmission not part of the bearing arrangement refers here in particular to a multi-gear main transmission in which a predefined number of gears, i.e., fixed gear ratios between the input shaft and a main transmission output shaft, can be shifted by shifting elements. Such main transmissions are primarily used in motor vehicles to suitably adapt the speed and torque output capacity of the motor vehicle drive unit to the driving resistance of the motor vehicle.

[0012] In the following, a shaft is not exclusively understood to mean, for example, a cylindrical, rotatably mounted machine element for transmitting torque, but rather also general connecting elements that connect individual components or elements to one another, in particular connecting elements that connect several elements to one another in a rotationally fixed manner.

[0013] The axial normal plane of the transmission gear corresponds to a plane perpendicular to a central axis of the transmission gear. The transmission gear can be arranged such that the central axis of the transmission gear is coaxial with a central axis of the input shaft of the main transmission.

[0014] The direction along which the bearing arrangement extends from the axial normal plane can run parallel to the center axis of the transmission gear. The first and / or second bearing can be designed as a plain bearing and / or can support the shaft, in particular exclusively, radially.

[0015] According to the invention, no bearing for supporting the shaft is arranged in another area of ​​the bearing assembly, which extends in a different direction from the axis normal. This means that the shaft is not supported by any bearings that are not located in the aforementioned area. This enables simple assembly of the bearing assembly with the main gearbox.

[0016] The transmission gear can be a planetary gear set. Alternatively, the transmission gear can consist of meshing gears. In one embodiment of the transmission gear of the planetary gear set, a ring gear can be connected to the shaft in a rotationally fixed manner. A carrier can be connected to the input shaft of the main transmission in a rotationally fixed manner, and a sun gear can be connected to a housing component of the main transmission, such as a centering plate. The third bearing can axially support the carrier of the planetary gear.

[0017] The transmission gear can be designed such that it has a ratio of 1.6. Thus, the shaft has a speed 1.6 times higher than the input shaft. Alternatively, the transmission gear can be designed such that the ratio is 1.5. A ratio of 1.6 is advantageous because the transmission gear is smaller in the radial direction compared to a ratio of 1.5. This leaves more space for the provision of additional components, such as a sensor device such as a speed sensor, by means of which the speed of a component of the transmission gear, in particular the ring gear, and / or the shaft can be determined.

[0018] An inner diameter of the first and / or second bearing can be smaller than an outer diameter of the transmission gear. In particular, if the transmission gear is designed as a planetary gear set, the inner diameter of the first and second bearings can be smaller than the outer diameter of the carrier or the outer diameter of the planetary gears attached to the carrier. As a result, both bearings can be dimensioned small.

[0019] Furthermore, the bearing arrangement can have a third bearing and a fourth bearing for supporting the shaft. The third and / or fourth bearing can support the shaft, particularly exclusively, axially. This means that the shaft can be supported radially by the first and second bearings and axially by the third and fourth bearings. This makes supporting the shaft particularly simple.

[0020] In addition to supporting the shaft axially, the third bearing can support at least one component of the transmission gear, particularly exclusively, axially. This allows the third bearing to be used to support two components of the bearing arrangement simultaneously.

[0021] In a special embodiment, the bearing assembly can comprise an electric motor that is operatively connected to the shaft. This can be achieved by connecting a rotor of the electric motor to the shaft via a rotationally fixed connection, such as a spline, or via another transmission gear. Such a bearing assembly can be designed as a hybrid module, which offers the advantage of allowing easy installation of a transmission. Thus, the hybrid module can be assembled before being coupled to the main transmission, and the hybrid module can be operatively connected as a complete unit to the input shaft of the main transmission.

[0022] The electrical machine consists of at least a rotationally fixed stator and a rotatably mounted rotor and is designed to convert electrical energy into mechanical energy in the form of speed and torque in motor operation, and to convert mechanical energy into electrical energy in the form of current and voltage in generator operation.

[0023] In a very special embodiment, the first bearing can be arranged such that a first bearing plane exists, which includes the first bearing and a rotor section of a rotor of the electric machine, and / or the second bearing can be arranged such that a second bearing plane exists, which includes the second bearing and another rotor section of the rotor of the electric machine. This ensures that the bearing arrangement or the hybrid module is compact in the axial direction.

[0024] A transmission that includes a bearing arrangement in addition to the main gear is particularly advantageous. One component of the transmission is connected to the input shaft in a rotationally fixed manner. In a transmission designed as a planetary gear set, the carrier is connected to the input shaft in a rotationally fixed manner.

[0025] The rotationally fixed connection can be achieved through spline engagement. A spline engagement is a shaft-hub connection where torque is transmitted through tooth flanks. The shaft has external teeth, while the hub has internal teeth. When unloaded, the shaft and hub can move axially relative to each other.

[0026] In a special design, the first and second bearings can be supported, particularly directly, on the input shaft. This allows for a simple shaft support.

[0027] The transmission can have an additional shaft that is non-rotatably connected to the input shaft, in particular by means of a spline. The engagement of the transmission component with the input shaft and the engagement of the additional shaft with the input shaft can be spaced apart from each other in the axial direction. This offers the advantage that the load on the input shaft is distributed across different areas of the input shafts due to the coupling to the shaft and to the additional shaft.

[0028] The additional shaft can be connected in a rotationally fixed manner to a motor vehicle drive unit that is not part of the transmission, such as an internal combustion engine. In particular, the additional shaft can be connected in a rotationally fixed manner to the motor vehicle drive unit by means of a shifting element, such as a clutch. Alternatively, the additional shaft can be connected in a rotationally fixed manner to the motor vehicle drive unit directly, i.e., without the provision of a shifting element. The additional shaft serves to supply the input shaft with an additional torque provided by the motor vehicle drive unit in addition to the torque provided by the electric motor. The additional shaft can carry outer plates of the clutch at the end remote from the input shaft.

[0029] The aforementioned shifting element and / or a secondary damper can be arranged radially below the rotor of the electric machine and / or radially between the rotor and the input shaft. This allows for a transmission with a compact design in the axial direction. Furthermore, the shifting element can be arranged in the axial direction in such a way that a plane exists in which the shifting element, the shaft, and the electric machine are arranged.

[0030] In a very special embodiment, a shaft section of the shaft can be arranged radially between the input shaft and the additional shaft. The shaft can at least partially enclose the input shaft. Furthermore, the additional shaft can at least partially enclose the shaft, in particular the shaft section. The aforementioned design and / or arrangement of the shaft, the additional shaft, and the input shaft enables a compact design of the transmission.

[0031] The shaft is surrounded by components, such as the input shaft and the other shaft, with a speed factor of 1. This means that there is always a constant speed ratio between the components. This is particularly advantageous when the first and second bearings are designed as plain bearings.

[0032] The shaft can be axially supported, in particular directly, on the other shaft, in particular exclusively, by means of the fourth bearing. This makes axial support of the shaft possible in a simple manner.

[0033] The transmission gear and the shaft can be connected upstream of the main transmission. Furthermore, the additional shaft can be connected upstream of the input shaft.

[0034] The input shaft may have multiple bores for oil flow. The oil enters the input shaft via cavities or forged pockets in components, such as a support shaft of the main transmission. The oil flows from the input shaft through the shaft and the rest of the shaft to a piston or a dynamic pressure compensation chamber of the shift element. The oil is sealed by rectangular rings.

[0035] The directions "radial" or "axial" used in this description refer to the center axis of the transmission gear in the bearing arrangement. For the transmission itself, the directions "radial" or "axial" refer to the center axis of the transmission.

[0036] A motor vehicle with a transmission and a motor vehicle drive unit is particularly advantageous. The motor vehicle drive unit can be connected to the other shaft in a rotationally fixed manner or can be connected in a rotationally fixed manner.

[0037] The subject matter of the invention is schematically illustrated in the figures and is described below with reference to the figures, wherein identical or equivalent elements are generally provided with the same reference numerals. In the figures: Fig.1: a schematic representation of a bearing arrangement according to the invention according to a first embodiment, Fig.2: a schematic representation of a bearing arrangement according to the invention according to a second embodiment.

[0038] Figure 1 shows a gearbox with a bearing arrangement and a main gearbox HG, which is operatively connected to the bearing arrangement.

[0039] The bearing assembly comprises a shaft 1, a transmission gear 2 operatively connected to the shaft 1, and a first and second bearing 4, 5 for supporting the shaft 1. The transmission gear 2 is designed as a planetary gear set and is operatively connected to an input shaft 3 of the main transmission HG. The first bearing 4 and the second bearing 5 are arranged in a region 6 of the bearing assembly, which extends from an axial normal plane A of the transmission gear 2 in the same direction R. The planetary gear has a gear ratio of 1.6.

[0040] The axial normal plane A divides a space of the bearing arrangement into a region 6, which extends from the axial normal plane A in the direction R, and another region 7, which extends from the axial normal plane A in another direction, in particular in a direction opposite to the direction R. The direction R runs parallel to a central axis of the planetary gear set, which is coaxial with a central axis M of the transmission.

[0041] The bearing assembly additionally includes an electric motor 10 that is operatively connected to the shaft 1. In particular, the shaft 1 is rotationally fixedly connected to a rotor of the electric motor 10. Furthermore, the shaft 1 is rotationally fixedly connected to a ring gear 14 of the planetary gear set.

[0042] The carrier 15 of the planetary gear set is rotationally fixedly connected to the input shaft 3 by means of a spline. The sun gear 16 of the planetary gear set is rotationally fixedly connected to a housing component 17 of the main transmission HG, such as a centering plate. The planetary gear set is arranged coaxially with the main transmission. In particular, the planetary gear set is coaxial with a center axis of the input shaft 3 of the main transmission HG, which coincides with the center axis M of the transmission.

[0043] The shaft 1 has a shaft section 1a at the end facing away from the electric machine 10. The shaft section 1a extends parallel to the center axis M of the transmission and encloses part of the input shaft 3. The shaft 1 also has another shaft section 1b, which extends in the radial direction and is connected to the shaft section 1a in a rotationally fixed manner.

[0044] The shaft section 1a is supported radially by the first bearing 4 and the second bearing 5. The shaft section 1a is supported radially on the input shaft 3 by means of the first and second bearings 4, 5. Furthermore, the shaft 1, in particular the other shaft section 1b, is supported axially by the third bearing 8 and the fourth bearing 9. The third bearing 8 is arranged axially between the shaft 1, in particular the other shaft section 1b, and the web 15.

[0045] The transmission has a further shaft 13, which can be rotationally connected to a motor vehicle drive unit (not shown in the figure) by means of a shifting element 18. The shifting element 18 is arranged radially between the electric motor 10 and the shaft section 1a. Furthermore, the shifting element 18 and the transmission gear 2 are opposite each other with respect to the other shaft section 1b.

[0046] The additional shaft 13 is connected to the input shaft 3 in a rotationally fixed manner by means of a spline. The additional shaft 13 engages with the input shaft 3 in an area that is axially spaced from the engagement area of ​​the web 15 with the input shaft 3. The additional shaft 13 encloses part of the shaft section 1a.

[0047] The shaft section 1a is arranged in the radial direction between the input shaft 3 and the further shaft 13. The fourth bearing 9 is arranged in the axial direction between the shaft 1, in particular the other shaft section 1b, and the further shaft 13 and supports the shaft 1 in the axial direction on the further shaft 13.

[0048] The first bearing 4 is arranged such that a first bearing plane L1 exists, in which the first bearing and a rotor section 11 are arranged. The second bearing 5 is arranged such that a second bearing plane L2 exists, in which the second bearing 5 and another rotor section 12 are arranged.

[0049] The transmission has a sensor device 18 for measuring the rotational speed of shaft 1 and / or the rotational speed of the ring gear 14. The sensor device 18 is arranged on the housing component 17 of the main transmission HG.

[0050] Figure 2 shows a bearing arrangement according to a second embodiment. The bearing arrangement differs from that in Figure 1 shown bearing arrangement in the design of the transmission gear 2. This is how Figure 2The transmission gear 2 shown in Figure 1 is also designed as a planetary gear set, but is designed in such a way that it has a transmission ratio of 1.5. Due to the lower transmission ratio, the planetary gear set extends further in the radial direction than the planetary gear set shown in Figure 1. Analogous to the Figure 1 The version shown is also available in Figure 2 In the embodiment shown, a sensor device 18 is provided for measuring the rotational speed of the shaft 1 and / or the ring gear 14. Reference symbol

[0051] 1Shaft 2Transmission gear 3Input shaft 4First bearing 5Second bearing 6Area of ​​the bearing arrangement 7Other area of ​​the bearing arrangement 8Third bearing 9Fourth bearing 10Electric machine 11Rotor section 12Other rotor section 13Further shaft 14Ring gear 15Web 16Sun gear 17Housing component 18Sensor device 1aWellenabschnitt 1banderer Wellenabschnitt AAchsnormalebene MMittelachse RRichtung L1erste Lagerebene L2zweite Lagerebene HGHauptgetriebe

Claims

1. A gear mechanism with a main gear mechanism (HG) of a motor vehicle, wherein the main gear mechanism (HG) has an input shaft (3), wherein the gear mechanism has a bearing arrangement with a shaft (1) and a transmission gear mechanism (2), operatively connected to the shaft (1), which is operatively connectable to the input shaft (3) of the main gear mechanism (HG), wherein the bearing arrangement has first and second bearings (4, 5) for bearing the shaft (1), wherein the first bearing (4) and the second bearing (5) are arranged in an area (6) of the bearing arrangement extending in the same direction (R) from an axis-normal plane (A) of the transmission gear mechanism (2), wherein a component of the transmission gear mechanism (2) is connected to the input shaft (3) in a rotationally fixed manner, wherein the first and second bearings (4, 5) are supported by the input shaft (3), characterised in that, in another area (7) of the bearing arrangement extending in another direction from the axis-normal plane (A), no bearing for bearing the shaft (1) is arranged.

2. The gear mechanism according to claim 1, characterised in that a. an inner diameter of the first and / or second bearings (4, 5) is less than an outer diameter of the transmission gear mechanism (2), and / or in that b. the first and / or second bearings (4, 5) radially, in particular exclusively, bear the shaft.

3. The gear mechanism according to claim 1 or 2, characterised in that the bearing arrangement has a third bearing (8) and a fourth bearing (9) for bearing the shaft (1), wherein the third and / or fourth bearings (8, 9) axially, in particular exclusively, bear the shaft (1).

4. The gear mechanism according to claim 3, characterised in that the third bearing (8) axially, in particular exclusively, bears at least one component of the transmission mechanism (2) additionally.

5. The gear mechanism according to any of claims 1 to 4, characterised by an electrical machine (10) operatively connected to the shaft (1).

6. The gear mechanism according to claim 5, characterised in that a. the first bearing (4) is arranged such that there is a first bearing plane (L1), having the first bearing (4) and one rotor portion (11) of the electrical machine (10), and / or in that b. the second bearing (5) is arranged such that there is a second bearing plane (L2), having the second bearing (5) and another rotor portion (12) of the electrical machine (10).

7. The gear mechanism according to any of claims 1 to 6, characterised in that the bearing has a further shaft (13), connected to the input shaft (3) in a rotationally fixed manner.

8. The gear mechanism according to claim 7, characterised in that the shaft (1) has a shaft portion (1a), a. arranged in a radial direction between the input shaft (3) and the further shaft (13), and / or b. at least partially enclosed by the further shaft (13).

9. The gear mechanism according to claim 7 or 8, characterised in that the shaft (1) is axially, in particular exclusively, supported by the further shaft (13) by means of the fourth bearing (9).

10. The gear mechanism according to any of claims 1 to 9, characterised in that the shaft (1) at least partially encloses the input shaft (3).

11. The gear mechanism according to any of claims 1 to 10, characterised in that the transmission gear mechanism (2) and the shaft (1) are drive-technologically upstream of the main gear mechanism (HG).

12. A motor vehicle with a gear mechanism according to any of claims 1 to 11 and a motor vehicle drive unit, characterised in that the motor vehicle drive unit is connectable in a rotationally fixed manner or connected in a rotationally fixed manner to the further shaft (13).