机械设计制造及其自动化-外文翻译-外文文献-英文文献-电力驱动桥说明书.doc
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1、Electric drive axle descriptionAbstract: An electric drive axle, which is located between and powers the left and right drive wheels of an automotive vehicle, includes an electric motor and left and right torque couplings. Torque developed by the motor transfers through the torque couplings to axle
2、shafts which are connected to the drive wheels. Each torque coupling includes a magnetic particle clutch and a planetary set organized such that the current flowing through the electromagnet of the clutch controls the torque delivered through the coupler. The magnetic particle clutches also accommod
3、ate slippage so that the drive wheels may rotate at different angular velocities.BACKGROUND OF THE INVENTION This invention relates in general to automotive vehicles and, more particularly, to an electically-powered drive axle for an automotive vehicle. The typical automobile derives all the power r
4、equired to propel it from an internal combustion engine which is coupled to left and right drive wheels through a transmission and differential. Indeed, the differential divides the torque produced by the engine evenly between the drive wheels to which it is coupled. Recently several automotive manu
5、facturers have demonstrated an interest in automobiles that in one way or another utilize electric motors to propel the vehicles. But these vehicles still rely on differentials of conventional construction to divide torque between the left and right drive wheels and to accommodate variations in spee
6、d between the drive wheels, such as when the vehicle negotiates a turn. However, an equal division of torque between the drive wheels on each side of a differential is not always desirable. For example, if the traction available to one of the drive wheels is diminished, most of the torque should flo
7、w to the other drive wheel. Also in turns, handling improves if most of the torque flows to the drive wheel on the outside of the turn. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS FIG. 1 is a schematic view of an automotive vehicle provided with an electric drive axle constructed in accor
8、dance with an embodying the present invention;FIG. 2 is an end view of the vehicle cut away to show the electric drive axle; FIG. 3 is a sectional view of the drive axle; FIG. 4 is an enlarged sectional of one of the torque couplers in the drive axle; FIG. 5 is an end view of a vehicle provided with
9、 a modified electric drive axle; FIG. 6 is a sectional view of the modified electric drive axle. DETAIL DESCRIPTION OF THE INVENTION Referring now to the drawings, an automotive vehicle A (FIG. 1) has a left and right drive wheels 2 and 4, respectively, that are powered through an electric drive axl
10、e B. To this end, the vehicle A has a source 6 of electrical energy, which could be a generator powered by an internal combustion engine or a bank of batteries or even fuel cells. In any event, the energy source 6 and the drive axle B are mounted on a supporting structure 8, which could be a frame o
11、r a unified body, and the supporting structure 8 is in turn supported in part by the wheels 2 and 4. The drive axle B is coupled to the wheels 2 and 4 through left and right axle shafts 10 and 12. It is organized about an axis X and includes (FIG. 2) a housing 20, an electric motor 22, and left and
12、right torque bias couplings 24 and 26, respectively. The motor 18 and couplings 24 and 26 are located within the housing 20. The motor 18, which is of the radial flux construction, includes (FIG. 3) a stator 30 which is mounted in the housing 20 in a fixed position around the axis X. It also include
13、s a rotor 32 which is located within the stator 30 where it revolves about the axis X. The rotor 32 includes a motor shaft 34 which at its ends is supported in the housing 20 on antifriction bearing 36. The housing 20 also encloses the two torque couplings 24 and 26, each of which includes a drive h
14、ub 40, a magnetic particle clutch 42, a planetary gear set 44, and a drive flange 46. They too are organized along the axis X. The two drive hubs 40 are connected to the motor shaft 34 of the rotor 32 through splines or other devices which enable them to rotate with the shaft 34 and transfer torque
15、from the rotor 32 to their respective torque couplings 24 and 26. Indeed, the two drive hubs 40 rotate in the bearings 36 and support the shaft 34 and likewise the rotor 32 on the bearings 36. The drive flanges 46 are for the most part located externally of the housing 20 and serve to couple their r
16、espective torque couplings 24 and 26 to the axle shafts 10 and 12. The drive hubs 40 function as torque input members, whereas the drive flanges 46 serve as torque output members. The clutch 42 for each torque coupling 24 and 26 includes (FIG. 4) an electromagnet 50 and an armature 52. Both are annu
17、lar in configuration and are organized about the axis X. The armature 52 resides within the electromagnetic 50, with the two being separated by antifriction bearings to the maintain a uniform annular gap g between them. The gap g contains magnetic particles. In the absence of a magnetic field at the
18、 gap g, the magnet 50 and armature 52 can rotate, essentially freely with respect to each other. However, when an electrical current is directed through the magnet 52, torque applied to the magnet 52 will transfer to the armature 54. Some slippage between the two may and in most instances will occur
19、. The magnet 50 around its periphery carries slip rings 56 which are wiped by brushes 58 fitted to the housing 20. The brushes 58 in turn are connected to a source of electrical energy, the potential of which may be varied to vary the current in the electromagnet 52 and the strength of the magnetic
20、field it produces. This controls the torque transferred by the clutch 42. The electromagnet 50 of the clutch 42 is secured firmly to the flange of the drive hub 36 at that end of the motor shaft 34 nearest the coupling 24 or 26 of which the clutch 42 is a component. Thus, the electromagnet 52 rotate
21、s with the rotor 32 of the electric motor 32. Should the electromagnet 52 be energized, torque applied to the electromagnet 52 will transfer to the armature 54. The planetary set 44 for each torque coupling 24 and 26 includes (FIG. 4) a sun gear 64, a ring gear 66, and planet gears 68 located betwee
22、n and engaged with the sun and ring gears 64 and 66. In addition, it has a carrier 70 which establishes the axes about which the planet gears 68 rotate. The sun gear 64 lies along the axis X, its axis coinciding with the axis X. It is provided with a stub shaft 72 which projects into the armature 56
23、 of the clutch 42, to which it is coupled through mating splines. The ring gear 66 is attached to the electromagnet 54 of the clutch 42 and to the flange on the drive hub 40 at the end of the motor shaft 34, so that the hub 36, the electromagnet 54, and the ring gear 66 rotate in unison about the ax
24、is X and at the same angular velocity. The carrier 70 has pins 74 which project into the planet gears 68, so that the planet gears 68, when they rotate, revolve about the pins 74. The pins 74 thus establish the axes of rotation for the planet gears 68. In addition, the carrier 70 has a spindle 76 wh
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