阅读说明：本技术 驱动装置 (Drive device ) 是由 B·瓦尔特 于 2019-08-15 设计创作，主要内容包括：本发明提供了一种驱动装置(10),其具有驱动轴(54)、电机(12)、基本上轴向平行于驱动轴(54)布置的电机轴(20)以及无级变速器(26),其中,无级变速器(26)具有联接至电机轴(20)的输入盘组(24)和经由牵引构件(38)联接至输入盘组(24)且联接至驱动轴(46)的输出盘组(40),其中,输出盘组(40)具有在轴向方向上不能相对于驱动轴(46)移动的输出侧固定盘(44)以及用于可选地改变能相对于驱动轴(46)轴向地移位的输出侧浮盘装置(48)相对于输出侧固定盘(44)的轴向距离的输出侧浮盘装置(46),其中,输出侧浮盘装置(46)至少部分地布置在与电机(12)共用的轴向区域中。由于无级变速器(26)的输出侧浮盘装置(48)布置成靠近电机(12)而可以实现机动车辆的高效且节省空间的驱动装置(10)。(The invention provides a drive device (10) having a drive shaft (54), a motor (12), a motor shaft (20) arranged substantially axially parallel to the drive shaft (54), and a continuously variable transmission (26), wherein the continuously variable transmission (26) has an input disc set (24) coupled to the motor shaft (20) and an output disc set (40) coupled to the input disc set (24) via a traction member (38) and to the drive shaft (46), wherein the output disk set (40) has an output-side fixed disk (44) which is not movable in the axial direction relative to the drive shaft (46) and an output-side floating disk device (46) for selectively changing the axial distance of an output-side floating disk device (48) which is axially displaceable relative to the drive shaft (46) relative to the output-side fixed disk (44), wherein the output-side floating disc device (46) is at least partially arranged in an axial region shared with the motor (12). An efficient and space-saving drive (10) for a motor vehicle can be achieved in that the output-side floating disc device (48) of the continuously variable transmission (26) is arranged close to the electric motor (12).)

1. A drive device for electrically driving a motor vehicle, the drive device having:

a drive shaft (54), the drive shaft (54) being used to drive a drive wheel (56),

an electric motor (12), the electric motor (12) being adapted to generate a drive torque electrically,

a motor shaft (20) arranged substantially axially parallel to the drive shaft (54) for transmitting the drive torque generated in the motor (12), and

a continuously variable transmission (26), in particular designed as a belt-driven conical disk transmission,

wherein the continuously variable transmission (26) has an input disc set (24) coupled to the motor shaft (20) and an output disc set (40) coupled to the input disc set (24) and to the drive shaft (54) via a traction member (38),

wherein the output-side fixed disk (44) and the output-side floating disk device (46) are arranged in the output disk group (40), the output-side fixed disk is not capable of moving relative to the drive shaft (46) in the axial direction, the output-side floating disk device is used for selectively changing the axial distance of the output-side floating disk device (48) which can be axially displaced relative to the drive shaft (454) relative to the output-side fixed disk (44),

wherein the output-side floating disc device (46) is at least partially arranged in an axial region common to the motor (12).

2. The drive device according to claim 1, characterized in that the motor (12) has an electrically operable stator (14) and a rotor (16) connected to the motor shaft (20), wherein the stator (14) has: a support (17), in particular a support (17) designed as a core; and a stator winding through which current flows, which is provided in the support (17), and the output-side floating disc device (46) is at least partially arranged in an axial region common to the support (17) and/or the stator winding.

3. A drive arrangement according to claim 2, characterised in that the end windings (18) of the stator windings project from the support (17) in the axial direction, and that the output side floating disc arrangement (46) is arranged axially offset relative to the support (17) at least partially in a common axial region with the end windings (18).

4. Drive arrangement according to one of claims 1 to 3, characterized in that the output-side floating disk arrangement (46) has a housing (58) for guiding the axially displaceable output-side floating disk arrangement (48), wherein the housing (58), in particular at least a majority of the housing (58), is arranged in a common axial region with the electric motor (12).

5. The drive device according to one of claims 1 to 4, characterized in that the input disc set (24) has an input-side fixed disc (30) and an input-side floating disc device (32), the input-side fixed disc (30) being immovable in the axial direction relative to the motor shaft (20), the input-side floating disc device (32) being used for selectively changing the axial distance of an input-side floating disc device (34) axially displaceable relative to the motor shaft (20) relative to the input-side fixed disc (30), wherein the input-side floating disc device (32) is arranged on an axial side of the input disc set (24) facing away from the motor (12).

6. The drive arrangement according to one of claims 1 to 5, characterized in that the output disc set (40) is indirectly coupled to the drive shaft (54) via a reduction stage arrangement (50), wherein the reduction stage arrangement (50) is at least partially arranged in a common axial region with the input disc set (24), in particular with the input-side floating disc arrangement (32).

7. The drive arrangement according to one of claims 1 to 6, characterized in that the output disc set (40) is indirectly coupled with two drive shafts (54) each leading to a drive wheel (56) via a differential gear (52), wherein the differential gear (52) is at least partially arranged in a common axial region with the input disc set (24), in particular with the input-side floating disc arrangement (32).

8. The drive device according to one of claims 1 to 7, characterized in that the output disc pack (40) is arranged coaxially with the drive shaft (54), wherein the output disc pack (40) in particular has a hollow shaft (42) which is connected to the output-side stationary disc (44) for the passage of the drive shaft (54).

9. The drive arrangement according to any one of claims 1 to 8, characterized in that the input disc set (24) is arranged coaxially to the motor shaft (20), wherein the input disc set (24) has a hollow shaft (28) connected to the input-side stationary disc (30) for the motor shaft (20) to pass through, and the input disc set (24) is indirectly coupled to the motor shaft (22) via a pre-reduction stage arrangement (22).

10. A drive arrangement according to claim 9, characterised in that the pre-reduction stage arrangement (22) is at least partially arranged in a common axial region with a reduction stage arrangement (50) and/or a differential gear (52), which reduction stage arrangement (50) and/or differential gear (52) is/are arranged in the torque flow between the output disc package (40) and the drive shaft (56).

Technical Field

The invention relates to a drive device, by means of which a motor vehicle can be driven electrically.

Background

A drive device for an electric drive motor vehicle is known from US 2005/0006967 a1, in which a motor shaft of an electric motor, which is offset radially with respect to a drive shaft, meshes with a differential gear of the drive shaft via two reduction spur gear teeth (reducing spur gear teeth).

There is a continuing need to reduce the efficiency and installation space requirements of electric drives for motor vehicles.

Disclosure of Invention

The object of the invention is to provide measures which enable an efficient and space-saving drive arrangement of a motor vehicle.

According to the invention, this object is achieved by a drive device having the features of claim 1. Preferred embodiments of the invention are set forth in the dependent claims and in the description below, each of which can represent an aspect of the invention either individually or in combination.

According to the invention, a drive for an electrically driven motor vehicle is provided, having a drive shaft for driving a drive wheel, a motor for electrically generating a drive torque, a motor shaft arranged substantially axially parallel to the drive shaft for transmitting the drive torque generated in the motor, and a continuously variable transmission, in particular designed as a belt-driven conical disk transmission, wherein the continuously variable transmission has an input disk set coupled to the motor shaft and an output disk set coupled to the input disk set via a traction member and to the drive shaft, wherein the output disk set has an output-side fixed disk that is not movable in the axial direction relative to the drive shaft, and an output-side floating disk device for selectively changing the axial distance of the output-side floating disk device that is axially displaceable relative to the drive shaft relative to the output-side fixed disk, wherein the output-side floating disk device is at least partially arranged in an axial region common to the motor.

With a continuously variable transmission, the transmission between the motor shaft and the drive shaft can be continuously varied, so that: at a particular desired speed of the drive shaft, the motor may operate efficiently close to the optimal operating point. This improves the efficiency of the drive. In order to change the transmission ratio, it is not necessary for the shifting process to interrupt the torque flow, so that the transmission ratio can be adjusted without interrupting the traction force, which is considered to be comfortable. A Continuously Variable Transmission (CVT), which is in particular designed as a belt-driven conical disk transmission, can couple a motor shaft and a drive shaft via a toothless traction element, in particular a V-belt, wherein the traction element can slip in the event of sudden torque fluctuations, so that damage to the components of the drive arrangement by the torque fluctuations can be avoided. Due to the substantially axially parallel arrangement of the motor and the motor shaft relative to the drive shaft, it is not necessary to arrange the motor coaxially with the drive shaft, so that in principle the axial extension of the drive shaft can be kept small. In particular, in the case of small cars with small vehicle widths, the electric drive option can be realized in the limited installation space available.

In addition, it is possible to interpose and nest the motor in the continuously variable transmission. At least a part of the output side floating disc device may cover a part of the motor when viewed in a radial direction in a plane including the motor shaft and the drive shaft. This results in a more compact construction which can save axial installation space. Herein, the following knowledge is used: due to the actuator provided for the axial displacement of the floating disc arrangement, the floating disc arrangement has a larger axial extension than the fixed disc. If the floating disk arrangement of the input disk stack and the floating disk arrangement of the output disk stack are arranged on different axial sides, the motor can be arranged adjacent to the narrow fixed disk of the input disk stack, so that the motor can be positioned partially in the common axial region with the floating disk arrangement of the output disk stack. This forms a free installation space on the stationary disk of the output disk stack in the axial region shared by the floating disk arrangement of the input disk stack, in which free installation space additional components can be arranged, so that the overall installation space requirement of the drive can be reduced. The output-side floating disc device can make good use of an installation space between the motor and the drive shaft that is otherwise difficult to use. Since the output-side floating disc device of the continuously variable transmission is arranged close to the motor, an efficient and space-saving drive device of the motor vehicle can be realized.

A Continuously Variable Transmission (CVT), which is in particular designed as a belt-driven conical disk transmission, can continuously vary the transmission torque and the transmission speed by continuously varying the transmission ratio by varying the axial distance between the input-side conical disk and a correspondingly designed input-side counter disk (counter disk) and correspondingly varying the axial distance between the output-side conical disk and a correspondingly designed output-side counter disk. The minimum and maximum gear ratios of the continuously variable transmission are defined by the minimum and maximum effective diameters of the input-side and output-side conical disk sets on the belt. The shaft of the input-side conical disk set may be coupled to the motor shaft of the motor or may form the motor shaft. The shaft of the output-side conical disk set may be coupled to the drive shaft or may form the drive shaft.

In particular, the electric machine has an electrically operable stator and a rotor connected to the machine shaft, wherein the stator has a support, in particular designed as a core, and a stator winding, through which a current flows, is arranged in the support, and the output-side floating disk device is arranged at least partially in a common axial region with the support and/or the stator winding. If the rotor is designed to be shorter in the axial direction than the stator, the support and/or the stator windings are arranged on an axial area common to the motor and the output-side floating disc device.

It is preferably provided that the end windings of the stator winding project in the axial direction from the support, and that the output-side floating disc arrangement is arranged at least partially in an axial region common to the end windings, axially offset with respect to the support. Due to the protruding end windings the electromagnetic effect of the stator can be maximized and a simple electrical contact can be achieved. At the same time, the outer dimensions of the motor between the support and the end windings of the stator winding protruding from the support may result in a step (step), the installation space of which may be used for collision-free positioning of the output-side floating disk device. It is even possible that the output side floating disc device is arranged close to the end winding such that: when viewed in the axial direction of the stator, a part of the support member overlaps with a part of the output-side floating disc device. This results in a particularly compact and space-saving design of the drive device, wherein the distance between the motor shaft and the drive shaft can be minimized.

The output-side floating disk arrangement particularly preferably has a housing for guiding the axially displaceable output-side floating disk arrangement, wherein the housing, in particular at least a substantial part of the housing, is arranged in a common axial region with the electric motor. In particular, in the relative position of the floating disk arrangement with respect to the stationary disk with maximum axial spacing, the floating disk arrangement can be positioned in an axial region common to the electric motor, wherein in principle the floating disk arrangement can be arranged as close as possible in the axial direction with respect to the stationary disk in an axially outer region of the axial region occupied by the electric motor. The housing, which is fixed in the axial direction, is arranged at least partially in an axial region common to the electric motor in each relative position of the float device.

In particular, the input-side set of disks has an input-side fixed disk which is not movable in the axial direction relative to the motor shaft and an input-side floating disk device for selectively changing the axial distance of the input-side floating disk device which is axially displaceable relative to the motor shaft relative to the input-side fixed disk, wherein the input-side floating disk device is arranged on the axial side of the input-side set of disks facing away from the motor. The floating disc arrangement of the input disc set and the floating disc arrangement of the output disc set may be arranged on different sides of the continuously variable transmission. Thus, a wider output side floating disc device may be positioned opposite a narrower input side fixed disc device, so that the motor may be partially disposed in an axial region common to the output side floating disc device.

The output disk set is preferably indirectly coupled to the drive shaft via a reduction stage arrangement, wherein the reduction stage arrangement is at least partially arranged in an axial region common to the input disk set, in particular the input-side floating disk arrangement. The reduction stage arrangement may provide a further fixed transmission or reduction, so that the desired speed range of the drive shaft may be better achieved with the electric machine. By positioning the reduction stage assembly close to the input disc stack, the axial installation space requirement can be reduced.

The output disk set is particularly preferably coupled indirectly via a differential gear to the two drive shafts which each lead to the drive wheels, wherein the differential gear is arranged at least partially in an axial region which is common to the input disk set, in particular the input-side floating disk arrangement. The differential gear enables the drive wheels coupled to the respective drive shafts to automatically adjust the required speed when cornering. By positioning the differential gear close to the input disc pack, the axial installation space requirement can be reduced.

In particular, the output disk stack is arranged coaxially with the drive shaft, wherein the output disk stack in particular has a hollow shaft which is connected to the output-side stationary disk for the passage of the drive shaft. This enables a fixed reduction between the output disc set and the drive shaft to be achieved with just one planet gear. Thus, the number of components can be kept low.

The input disc set is preferably arranged coaxially with the motor shaft, wherein the input disc set has a hollow shaft which is connected to the input-side stationary disc for the motor shaft to pass through, and the input disc set is indirectly coupled to the motor shaft via a pre-reduction stage. This enables a fixed reduction between the motor shaft and the input disc set to be achieved with only one planet gear. Thus, the number of components can be kept low. In this context, either only the input-side pre-reduction stage arrangement or only the output-side reduction stage arrangement may be provided, or both the input-side pre-reduction stage arrangement and the output-side reduction stage arrangement may be provided.

The pre-reduction stage arrangement is particularly preferably arranged at least partially in an axial region common to the reduction stage arrangement and/or the differential gear provided in the torque flow between the output disk stack and the drive shaft. By positioning the pre-reduction stage arrangement close to the reduction stage arrangement and/or the differential gear, the axial installation space requirement can be reduced.

Drawings

The present invention is illustrated by way of example in the accompanying drawings which use preferred exemplary embodiments, in which features shown below are capable of representing one aspect of the invention both in isolation and in combination. In the drawings:

figure 1 shows a schematic view of a first embodiment of the drive means,

fig. 2 shows a schematic view of a second embodiment of the drive device, an

Fig. 3 shows a schematic cross-sectional view of the drive from fig. 1.

Detailed Description

The drive device 10 illustrated in the figures and fig. 3 of an electrically drivable motor vehicle has an electric machine 12 with a stator 14 and a rotor 16. The rotor 16 may have a support 17, which support 17 has a small axial extension compared to the rotor 16, and the stator windings through which the current flows are embedded in the support 17. The stator windings may have end windings 18 protruding from the support 17 in the axial direction. The rotor 16 is connected in a rotationally fixed manner to a motor shaft 20, which motor shaft 20 is in turn coupled to an input disc set 24 of a continuously variable transmission 26, which continuously variable transmission 26 is configured as a belt-driven conical disc transmission.

The input disc set 24 has an input-side fixed disc 30 connected to the motor shaft 20 in a rotationally fixed manner, and an input-side floating disc arrangement 32. The input-side floating disc device 32 has an input-side floating disc device 34, the input-side floating disc device 34 being axially displaceable relative to the input-side fixed disc 30, and the input-side floating disc device 34 being displaceable against the elastic force of a return spring by means of hydraulic pressure built up in an input-side pressure chamber 36, so that a traction member 38 designed to be pressed as a V-belt between the input-side fixed disc 30 and the input-side floating disc device 34 is displaced for continuously changing the transmission ratio of the continuously variable transmission 26 according to different effective radii.

The output disc set 40 is coupled to the input disc set 24 via the traction member 38. The output disc group 40 has an output side fixed disc 44 connected to the output side hollow shaft 42, and an output side floating disc device 46. The output side floating disc device 46 has an output side floating disc device 48, the output side floating disc device 48 is axially displaceable relative to the output side fixed disc 44, and the output side floating disc device 48 can press the traction member 38 between the output side fixed disc 44 and the output side floating disc device 48. The output-side hollow shaft 42 is coupled to a differential gear 52 via a reduction stage 50 designed as exactly one planetary gear, from which differential gear 52 two drive shafts 54 extend. A drive wheel 56 is coupled to each drive shaft 54.

The input side floating disc device 32 and the output side floating disc device 46 are disposed on different sides of the continuously variable transmission 26, with the motor 12 positioned adjacent to the input side fixed disc 30. Thus, the output-side floating disc device 46 can be arranged in a space-saving manner in an axial region common to the motor 12 with the at least one housing 58. At least the housing 58 and the end windings 18 protruding from the support 17 of the stator 14 may be arranged at least partially in a common axial region such that a portion of the output side floating disc device 46 overlaps a portion of the motor 12 when viewed in a radial direction in a plane including the motor shaft 20 and the drive shaft 54.

In the embodiment of the drive 10 shown in fig. 2, in contrast to the embodiment of the drive 10 shown in fig. 1, a pre-reduction stage arrangement 22 is arranged on the input side between the motor shaft 20 and the input disc stack 24. To this end, the motor shaft 20 is coupled via a pre-reduction stage 22 to an input-side hollow shaft 28 of the input disc stack 24, through which input-side hollow shaft 28 the motor shaft 20 passes. The input side hollow shaft 28 is connected to the output of the pre-reduction stage arrangement 22, which is configured as exactly one planetary gear, and to the input side stationary disk 30. The pre-reduction stage arrangement 22 is arranged in a space-saving manner in an axial region common to the reduction stage arrangement 50 and/or the differential gear 52.

Description of the reference numerals

10 drive 12 motor 14 stator 16 rotor 17 support 18 end winding 20 motor shaft 22 pre-reduction stage 24 input disc pack 26 continuously variable transmission 28 input side hollow shaft 30 input side floating disc device 34 input side floating disc device 36 input side pressure chamber 38 traction member 40 output disc pack 42 output side hollow shaft 44 output side floating disc device 46 output side floating disc device 50 reduction stage 52 differential gear 54 drive shaft 56 drive wheel housing 58.