DE10057092A1 - Drive system for vehicle has left and right drive wheels, each driven by electric motor(s) and gearbox with mechanical, continuously adjustable gear unit(s) with bevel pulley pairs, belt element - Google Patents

Abstract

The vehicle has at least one left and right drive wheel, each driven by at least one electric motor (14,16) and gearbox containing a mechanical, continuously adjustable gear unit (50,52) with two bevel pulley pairs (60,62; 64,66; 68,70; 72,74) and a belt element. Each drive wheel can have two associated electric motors that drive the wheel in common via separate gear units, a pair of pulleys being mounted on a common output shaft per gear unit.

Description

The invention relates to a drive system for a Vehicle according to the preamble of claim 1.

Electrical machines are becoming increasingly popular today driven by vehicles, especially commercial vehicles in the Road traffic used (see "An electrical single wheel drive for city buses of the future "by B. Wüst, R. Mül ler, A. Lange in "Der NAHVERKEHR", 6/1994, Alba-Verlag, Dusseldorf). They are also used for tracked vehicles Drive of the chain drive wheels used. electrical Machines have operating areas with a very good we efficiency and operating areas in which the efficiency is significantly worse. Become such an electric machine When used in vehicles, the An is usually used drive system designed so that the predominant operation share lies in the areas of optimal efficiency. al However, the vehicle cannot be avoided is also operated in areas where the efficiency is worse. That is why the electrical machines in a gearbox is connected in some applications.

DE 196 19 321 C2 describes a method of operation of a vehicle with several electric drive machines known, with each wheel of an axis of the vehicle assigned electric drive machine and each drive machine has at least a two-stage, switchable transmission is subordinate. To interrupt the traction during the To avoid shifting, the gears are timed offset switched, the switching process of a he most drive engine downstream of the gearbox is monitored  and the switching process of a second drive unit Subsequent gearbox only takes place when the Shifting process of the first transmission is completed. As Gearbox is preferably a two-stage gearbox see that as an inexpensive design as a dog gear can be realized that either synchronized or is designed unsynchronized. With a two-stage Manual transmissions are of the available speed and torque range relatively small, so the drives for heavy vehicles, especially for a military one Commitment, not enough. Although the traction is not under is broken, only a part remains during the switching process of the installed drive power is available, e.g. B. in the case of two prime movers, the tractive force of one prime machine is interrupted. This is particularly the case with chains vehicles disadvantageous because of a difference between the Right chain drive and left chain drive one Steering movement is triggered.

Furthermore, a hybrid drive system is known from WO 97/09191 stem known that contains an internal combustion engine, the Output shaft drives an electric motor generator. The electric motor drives via a continuously adjustable Transmission (CVT) on a wheel axle, the electric motor for one by the electric generator from the internal combustion engine and secondly, it is supplied with electricity by a battery. The battery is charged by the generator if an over shot energy is available.

Another vehicle is known from DE 196 29 235 A1 Drive unit known that an internal combustion engine and egg NEN motor generator for converting electrical energy a battery into mechanical energy to convert the  deliver mechanical energy, or to umwan transform mechanical energy into electrical energy in order to to convert converted electrical energy in the battery manuals. The internal combustion engine and the motor generator are driven by a summation gear in planetary design connected, the driven part with the input part of a continuously variable transmission is connected. As a stepless Ge Drives is a belt or ring type gear unit hen.

Finally, in an older patent application DE 100 05 527.3 a drive system for a tracked vehicle described, each with a chain drive wheel for the left and right chain via a summation gear from two electric motors is driven. One of each Electric motors that are assigned to a chain are used by a first generator, while the other elec tromotors are fed by a second generator.

The invention is based, to verver the task casual drive system with a large control range Lich the torque and the maximum speed for to create a vehicle that has at least one right and left drive wheel, which each have at least one Electric motor is assigned. It is made according to the invention solved by the features of claim 1. Further Ausge Events result from the subclaims.

According to the invention, the transmission comprises a mechani cal, continuously adjustable gear unit. This gear unit can be a friction gear or preferably a Gearbox with two pairs of conical pulleys and one wrapping be a regulatory body. The latter gear units, also CVT (Continuous  Variable Transmission) are called in the Tech nik u. a. are also often used in vehicle construction therefore proven components. Suitable as a wrap especially pull chains or push link belts.

The have continuously adjustable gear units a large control range so that it can also be used are suitable for military wheeled and tracked vehicles, where extreme demands in terms of traction and the maximum speed. This maxi paint values are solely through the control range of an elec tromotors not to cover, especially if the drives like use on caterpillars to steer the vehicle must be det. It is advantageous that the ge Drive through the entire control range without interrupting the tractive force can be.

By continuously changing the gear unit it is possible that the electric motor or the electric motor in an area with optimal efficiency can drive. Furthermore, there are chain driving testify by the double control option over the Elek tromotor and the continuously adjustable gear unit an extremely high maneuverability, being advantageous is that the radius changes are not erratic, but done continuously.

The mechanical, continuously variable transmission unit is also advantageous for drive systems where meh electric motors each via a gear unit act a drive wheel. It is expedient to use one Cone pulley pair of a gear unit on a common men output shaft arranged. Are z. B. the adjustable  Conical washers of the cones adjacent on the output shaft disc pairs facing each other, result spatially favorable conditions for the arrangement of the actuator gans and control lines as well as pressure lines. At a appropriate interpretation of the control or regulation of the Gear units can be added to an additional summation drives for the individual electric motors can be dispensed with.

According to one embodiment of the invention, the elec electric motors with at least two generators ver bound, like the electric motors AC machines are. The output of a first generator is on gear of a first rectifier electrically connected Output of a second generator with the input of a second rectifier. Furthermore, the exit of the first Rectifier simultaneously with the input of a first left and a first right inverter electrically connected while the output of the second rectifier simultaneously with the receipt of a second left and one second right inverter is electrically connected. The output of each inverter is connected to the input one associated electric motor electrically connected.

This ensures that a any component of the drive system the tracked vehicle nevertheless remains drivable and steerable. For example, if first generator or an internal combustion engine driving this seem to remain to drive the two drives chain the second generator and one to it second internal combustion engine. The second generator ver provides the second left and the second right electromo gates that drive the right and left chain drive wheels. In this case, the vehicle only has a reduced version  Drive power, however, it is not maneuverable capable, and it can be deployed on its own reach location.

Further advantages result from the following drawing planning description. In the drawing is an execution example shown game of the invention. The description and the Claims contain numerous features in combination. The Those skilled in the art will expediently also individually consider and together to useful further combinations summarized.

Show it:

Fig. 1 is a schematic representation of a chain vehicle and

Fig. 2 is a schematic representation of a single unit II in Fig. 1st

Although the embodiment of FIG. 1 is a vehicle chains, the invention applies equally to vehicles of the wheel, which have a single wheel. The direction of travel of the tracked vehicle is designated 80. A first, right electric motor 14 and a second, right ter electric motor 16 drive via a first, right reducing gear 22 and second, right reducing gear 24 , and a right gear 30, a right chain drive wheel 34 for a right drive chain 4 . The transmission 30 comprises two mechanical, continuously variable transmission units, namely a first right CVT 50 and a second right CVT 52 ( FIG. 2). If the chain drive wheel 34 is only driven by an electric motor 14 or 16 , one of the CVTs 50 , 52 is omitted.

A first left electric motor 18 and a second lin ker electric motor 20 drive a chain drive wheel 36 for the left drive chain 2 via a first left reduction gear 26 and a second left reduction gear 28 as well as a left gear 32 . The left gear 32 is constructed in accordance with the right gear 30 . It is therefore not shown in detail.

The electric motors 14 , 16 , 18 , 20 are supplied with current by a first generator 6 and a second generator 8 , which are driven by a first internal combustion engine 10 and a second internal combustion engine 12 , respectively. The electric motors 14 , 16 , 18 , 20 and the generators 6 , 8 are AC machines. The output of the first generator 6 is electrically connected to the input of a first rectifier 38 , while the output of the second generator 8 is electrically connected to the input of a second rectifier. The output of the first rectifier is electrically connected both to the input of a first, left inverter 40 and to the input of a first, right inverter 42 . Accordingly, the output of the second rectifier 44 is electrically connected to the input of a second left inverter 46 and a second right inverter 48 at the same time. The output of each inverter 40 , 42 , 46 , 48 is connected to the input of an associated electric motor 14 , 16 , 18 , 20 , so that the first left inverter 40 with the first left electric motor 18 , the second, left inverter 46 with the second, left Elektromo gate 20 , etc. is connected. The redundancy of the drive elements and circuit elements in the manner shown ensures that the tracked vehicle still remains drivable and steerable if any component of the drive system fails.

The gear 30 and the gear 32 have the same structure. The electric motor 14 drives via its drive shaft 54 to a first pair of conical disks 60 , 62 , where the conical disk 62 is firmly connected to the drive shaft 54 , while the conical disk 60 is non-rotatably but axially displaceably seated on the drive shaft 54 . The loose conical disk 60 can be adjusted axially via actuators, not shown, so that the v-shaped space between the conical disks 60 , 62 of the adjuster changes. A second pair of conical disks 64 , 66 is arranged on an output shaft 58 , the conical disk 64 being axially displaceable but non-rotatably mounted on the drive shaft 56 .

The second, right electric motor 16 drives with its drive shaft 56 a second, right CVT 52 , the first pair of conical disks 68 , 70 on the drive shaft 56 , the second pair of conical disks 72 , 74 are arranged on the output shaft. From the pair of conical disks 70 , 68 , the conical disk 70 is firmly connected to the drive shaft 56 , while from the pair of conical disks 72 , 74 the conical disk 74 is firmly connected to the output shaft 58 . The loose conical disks 68 and 72 are rotatably but axially displaceably mounted on the drive shaft 56 and the Abtriebswel le 72 . They can also be adjusted axially by actuators, not shown. The loose cone pulleys 64 and 72 are arranged adjacent to the drive shaft 58 so that the actuators can be provided between them. This results in a spatially favorable arrangement of the actuators and the feed lines to the actuators.

The conical pulley pairs 60 , 62 and 64 , 66 are surrounded by a looping member 76 in the form of a chain or a push band, the contact surfaces of which on the conical surfaces of the conical pulleys 60 , 62 and 64 , 66 run according to the transmission ratio on different radii. The belt member of the second right CVT 52 is identified by 78.

Since the conical disk pairs 64 , 66 and 72 , 74 are arranged on a common output shaft 58 , the powers of the electric motors 14 , 16 are summed up. The CVTs 50 , 52 are regulated so that no slippage occurs at the belt organs 76 , 78 . With such an arrangement, an additional summation gear can be omitted without the efficiency deteriorating due to slippage.

reference numeral

2

left drive chain

4

right drive chain

6

first generator

8th

second generator

10

first internal combustion engine

12

second internal combustion engine

14

first, right electric motor

16

second, right electric motor

18

first, left electric motor

20

second, left electric motor

22

first, right reducer

24

second right reducer

26

first, left reducer

28

second, left reducer

30

right gear

32

left gear

34

sprocket

36

sprocket

38

first rectifier

40

first left inverter

42

first right inverter

44

second rectifier

46

second left inverter

48

second right inverter

50

first right CVT

52

second, right CVT

54

drive shaft

56

drive shaft

58

output shaft

60

loose cone pulley

62

fixed cone pulley

64

loose cone pulley

66

fixed cone pulley

68

loose cone pulley

70

fixed cone pulley

72

loose cone pulley

74

fixed cone pulley

76

encircling

78

encircling

80

direction of travel

Claims (6)

1. Drive system for a vehicle with at least one right ( 34 ) and left drive wheel ( 36 ), each of which is driven by at least one electric motor ( 14 , 16 , 18 , 20 ) and a transmission ( 30 , 32 ), thereby ge indicates that the transmission ( 30 , 32 ) comprises a mechanical, continuously adjustable transmission unit ( 50 , 52 ). 2. Drive system according to claim 1, characterized in that the gear units ( 50 , 52 ) each have two conical pulley pairs ( 60 , 62 ; 64 , 66 or 68 , 70 ; 72 , 74 ) and a looping element ( 76 , 78 ) , 3. Drive system according to claim 2, characterized in that each drive wheel ( 34 , 36 ) is assigned two electric motors, each of which drives a drive wheel ( 34 , 36 ) by means of a gear unit ( 50 , 52 ) by a conical disk pair ( 64 , 66 ; 72 , 74 ) of each gear unit ( 50 , 52 ) is arranged on a common drive shaft ( 58 ). 4. Drive system according to one of claims 2 or 3, characterized in that the Umschlin supply member ( 76 , 78 ) is a pull chain or a push link belt. 5. Drive system according to one of claims 3 or 4, characterized in that on the output shaft ( 56 , 58 ) slidably arranged cone disks ( 64 , 72 ) are adjacent to each other. 6. Drive system according to one of the preceding claims, characterized in that the electric motors ( 14 , 16 , 18 , 20 ) are electrically connected to at least two generators ( 6 , 8 ) which, like the electric motors ( 14 , 16 , 18 , 20 ) are AC machines, the output of a first generator ( 6 ) being electrically connected to the input of a first rectifier ( 38 ), the output of a second generator ( 8 ) being electrically connected to the input of a second rectifier ( 44 ) , the output of the first rectifier ( 38 ) is simultaneously electrically connected to the input of a first, left ( 40 ) and a first, right inverter ( 42 ), the output of the second rectifier ( 44 ) is simultaneously connected to the input of a second, left ( 46 ) and a second, right inverter ( 48 ) is electrically connected and wherein the output of each inverter ( 40 , 42 , 46 , 48 ) with the input of an associated electromotive ( 14 , 16 , 18 , 20 ) is electrically connected.