FR2801144A1 - DRIVE DEVICE WITH ELECTRIC MOTOR APPLICABLE IN PARTICULAR TO A CARRIER - Google Patents

Abstract

Device comprising an electric motor and a differential (10) connected at the output to two rotors (11, 12). The motor comprises a stator (4) and a rotor (5) cooperating with the differential (10). The axes of the output rotors (11, 12) and the motor (5) are coaxial. The differential (10) is integrated in the rotor (5). The differential (10) is with straight gears and the electric motor with permanent magnets. The motor comprises a housing (1) with side covers (2, 3) each receiving an output rotor (11, 12).

Description

The present invention relates to a drive device comprising a

  electric motor with a stator and a rotor, and a differential cooperating with the rotor, the output of the differential being connected to two output rotors whose axes are coaxial with each other and with the axis of the rotor

of the electric motor.

  A drive device corresponding to the type defined above is described in the document

  DE 43 00 445 Al as part of a self-supporting driving axle.

  The present invention aims to develop a drive device corresponding to the above type,

  compact and allowing multiple applications.

  To this end, the invention relates to a device

  characterized in that the differential is integrated in the ro-

tor of the electric motor.

  This shortens the length of the device.

  tif of training on the one hand simplifying the construction and reducing the manufacturing cost and allowing on the other hand new applications. Thus, in the applications of the drive device according to the invention as an axle, the

  reduced dimensions allow very small wheelbases.

  For axles called "steered wheels" and / or for a

  single wheel suspension, articulations can be used

  homokinetic tions. This results in smaller angles

  for articulated axes, increasing their lifespan.

  Insofar as the differential is closed by

  in a leaktight way, we prevent lubricant from coming out of the diff

  and does not arrive in the electrical part of the drive device. Advantageously, the electric motor is the central part of a wheel axle. This allows the drive device according to the invention to be used in principle.

  in each type of axle or vehicle.

  According to another development of the invention, the electric motor is mounted in a pendulum pivot. In this case, the drive device according to the invention can for example be used in the case of a transport trolley with a guided pendulum pivot in which the tandem wheels

  transmit the driving force to the road.

  In such a pendulum pivot motor,

  currently training devices with no difference

  tiel. In these arrangements, either only one of the two eccentric tandem wheels is driven, which creates a torque around the vertical axis of the drawbar, or according to another solution, the two wheels are driven by mounting them on a common shaft,

  so that the tandem wheels are rigidly connected in a ro-

  tation, producing a forced, annoying skating, in work

  curved jectories. The drive device according to the invention transmits only a small steering reaction to the drawbar and makes it possible to reduce wheel wear compared to

  an assembly comprising only one driving wheel.

  As a differential one can use a differential

  tial with bevel gables. According to an advantageous development of the invention, the differential is produced with straight pinions.

  To have a compact construction, a development

  pement advantageous of the invention provides to achieve the mo-

  electric motor as a permanent magnet electric motor.

  It is interesting in this case that the stator is provided with a

  winding system and the rotor of a per- magnet system

  manents. Insofar as the electric motor comprises a housing with two side covers and one or both covers each housing an output rotor, there will be other advantages from the point of view of the compactness and the

simple assembly.

  The output rotors can also be reset

  read in the form of trees whose outer end is each time provided with a flange. But it is also possible

  to produce the output rotors in the form of em-

  boxes each provided with means for transmitting the torque.

  According to an advantageous development of the invention, each output rotor comprises a brake, in particular a brake

  electromagnetic loosening and / or transmission, in particular

  planetary transmission planned upstream or downstream.

  The above components can be mounted directly to the

  level of the electric motor, for example in its housing.

  In an application of the drive device according to the invention to an axle, it is also possible to mount the components in the rims, which makes it possible to reduce the length of the shafts connecting to the device.

  drive (intermediate part of the axis).

  Insofar as the covers and / or the brakes and / or the transmissions are symmetrical with respect to a median plane of the electric motor, perpendicular to its axis, there is a very high balance of masses. This simplifies the

  mounting the drive device according to the invention and

reduces its manufacturing cost.

  The present invention will be described below using different embodiments shown schematically in the accompanying drawings in which: - Figure 1 is a longitudinal section of a drive device according to the invention in the form of a central part of an axle,

  - Figure 2 is a longitudinal section of a first va-

  laughing of the drive device of FIG. 1,

  - Figure 3 is a longitudinal section of a second va-

  laughing of the drive device of Figure 1, - Figure 4 is a longitudinal section of a drive device according to the invention installed in a pendulum pivot, - Figure 5 is a cross section of the device

Figure 4.

  According to FIG. 1, the basic element of the device

  tif drive of the invention is an electric motor.

  This consists of a housing 1 and two covers la-

  2, 3. The housing 1 receives a stator 4 and a rotor 5.

  The stator 4 is formed by a system of windings 6, 7 with the interposition of a package of stator sheets 8. The rotor 5 is mounted in the covers 2, 3 and its outer side is

  connected to a permanent magnet system 9.

  The rotor 5 incorporates a differential 10, the output of which is connected to two output rotors 11, 12. The output rotors 11, 12 of the present embodiment have the

  shape of shafts mounted in bearings of covers 2, 3.

  The outer end of each shaft is provided with a flange 11a, 12a. The rotor 5 constitutes the cage of the differential 10 produced here in the form of a differential with straight gears. It is also possible to produce the differential 10 in the form of a differential with bevel gears. The other parts of the differential 10 structure will be described later. The differential 10 is closed in a sealed manner by two shaft seals 13, 14. The shaft seals are

  mounted between the rotor 5 and the covers 2, 3. This is thus avoided

  if lubricant does not come out of differential 10 and does not

  in the electrical part of the drive device.

  The first variant of the drive device

  according to the invention represented in FIG. 2, mainly presented

  the same basic structure as the embodiment of

  Figure 1. In addition, at each output rotor 11, 12 is as-

  associated with an electromagnetic release brake 15, 16 with a

brake winding 17, 18.

  The second variant of the drive device according to FIG. 3 also in principle has the same

  basic structure as the embodiment of Figure 2.

  The output rotors 11, 12 are however in this case in

  form of nestable trees, followed each time by a trans-

  mission 19, 20 in the form of planetary transmission. The element

  output of each planetary transmission is an

  measuring rod 19a, 20a mounted in the cover 2, 3. For transmits-

  be the torque between the output rotors 11, 12 and the transmissions 19, 20, the outer end of the rotors

  output (nestable shafts) includes means of transmission

  torque torque in the form of solar wheels 19b, 20b ap-

  starting with planetary transmissions.

  Figures 4, 5 each show a drive device according to the invention with a pendulum pivot used in a transport carriage guided by the drawbar. The mounting of the drive device corresponds in principle to the embodiment of the invention shown in

  Figure 3. The output spacers 19a, 19b of the trans-

  planetary mission (in this case at two levels) are linked each time to a department 21, 22 respectively receiving a

tandem wheel 23, 24.

  The housing 1 of the electric motor is mounted at

  using two coaxial pins 25, 26 (see FIG. 5) above

  revolution of a pendulum axis P, in a pendulum arrangement, in a support 27 in the shape of a stirrup. The pendulum axis P is located in the area near the road, that is to say, this axis

  is located significantly below the central axis

  tral M of the electric motor and thus of the common axes of the tandem wheels 23, 24. This has the drawback that the pendulum movement caused by passing over an obstacle creates only a slight lateral movement of the device

  drive and thus the carrier vehicle.

  The support 27 is mounted to pivot about an axis

  upright H, by means of the pin journal

  tical 28. The pivoting can be controlled by a drawbar (as indicated in phantom in Figure 5) or by a motor, for example an electric motor formed by a motor

  with permanent magnets combined with a reducer.

  The construction of the differential 10 appears in the combination of FIGS. 4 and 5. Each output rotor 11, 12 has, at its inner end, a planetary wheel 29, 30. The planetary wheel 29 of the output rotor 11 is engaged with a first differential 31 mounted on a first differential journal 32 of the rotor 5. The first pinion

  differential 31 is engaged with a second differential pinion

  tiel 33 mounted on a second differential pin 34 available

  both of the first pin 32 in the peripheral direction and it is engaged with the planetary wheel 30 of the rotor

exit 12.

  The same layout exists, offset by 180 in

  the peripheral direction, i.e. the flat wheel

  shutter 30 of output rotor 12 is engaged with a three-

  sth differential wheel 35 mounted on a third

  differential pin 36 of rotor 5; the third wheel differs

  35 is engaged with a fourth differential wheel

  rod 37 mounted on a fourth differential journal 38 spaced from the third differential journal 36 in the peripheral direction, while engaging the planetary wheel

29 of the output rotor 11.

  The construction of the differential 10 as described above produces, for a displacement in a straight line, the same output rotational speed for the two rotors 11, 12. In this case, there will be no movement of rotation of the differential wheels. In the case of a curved trajectory, the

  differential 10 compensates for the speed of rotation of the two rotations

  output tors 11, 12 and thus of the two tandem wheels 23, 24.

  In the exemplary embodiments shown, the covers 2, 3, the brakes 15, 16 and the transmissions 19,

  are symmetrical with respect to a median plane perpendicular to

  the axis M of the electric motor. This offers the advantage of a very advanced mass balance.

Claims (9)

R E V E N D I C A T I ON S   1) Drive device comprising an electric motor with a stator and a rotor, and a differential cooperating with   the rotor, the output of the differential being connected to two rotors   output tors whose axes are coaxial with each other and with the axis of the rotor of the electric motor, characterized in that the differential (10) is integrated in the rotor of the electric motor. 2) Device according to claim 1, characterized in that   the differential (10) is sealed.   3) Device according to any one of claims 1   or 2, characterized in that the electric motor is the central part of a wheel axle.   4) Device according to any one of claims 1 to 3, characterized in that   the electric motor is mounted in a pendulum pivot.    ) Device according to any one of claims 1 to 4, characterized in that   the differential (10) is a differential with spur gears.   6) Device according to any one of claims 1 to 5, characterized in that   the electric motor is an electric motor with per- manents.   7) Device according to claim 6, characterized in that the stator (4) is connected to a winding system (8) and the   rotor (5) to a system of permanent magnets (9).   8) Device according to any one of claims 1 to 7, characterized in that   the electric motor has a housing (1) with two covers   side keys (2, 3) and one or each of the covers (2, 3)   houses one of the output rotors (11, 12).   9) Device according to any one of claims 1   to 8, characterized in that the output rotors (11, 12) are in the form of shafts whose respective outer end is provided with a flange (11a, 12a).    ) Device according to any one of claims 1 to 8, characterized in that   the output rotors (11, 12) are mutually nestable shafts   each of means (19a, 20a) for the transmission of full.   11) Device according to any one of claims 1   to 10, characterized in that each output rotor (11, 12) is associated with a brake (15, 16), in particular an electromagnetic release brake, and / or   a transmission (19, 20), in particular a planetary transmission   silence is planned upstream or downstream.   12) Device according to any one of claims 1   to 11, characterized in that the covers (2, 3) and / or the brakes (15, 16) and / or the transmissions (19, 20) are symmetrical plane with respect to   a median plane perpendicular to the axis (M) of the electric motor than.