FR2689702A3 - Plastic capsule for slip rings of electric motors for motor vehicles. - Google Patents

Abstract

a) Plastic capsule for slip rings of electric motors for motor vehicles. b) Capsule characterized in that at least three ventilation channels (19) are arranged being distributed around the periphery of the adjusting ring section (16) on the inner side of the adjusting ring in such a way that at least one of the channels is as a water jet at a height below the underside of the slip rings.

Description

"Plastic capsule for collector rings

  electric motors for vehicles with

  The invention relates to a plastic capsule for the slip rings of an electric motor, in particular a three-phase alternator for motor vehicles, with an armature with claw blades, the winding of which The excitation is supplied by a slip ring device by means of carbon brushes, the pot-shaped plastic cap surrounding the space of the slip rings on the end section of the armature shaft behind the bearing. on the brush side and at the open end on the bearing side by means of an annular wall formed in front of the bearing being enlarged as a bearing adjusting ring for the outer ring of the bearing as well as being provided for the venting the space of the slip rings of at least one ventilation channel 20 in the section of the adjusting ring

  In the case of such a known plastic encapsulation of the space of the slip rings

  of a three-phase alternator for motor vehicles (JP-POS 17 87 44/88) a ventilation channel

  in the bearing adjusting ring section

  formed on the encapsulation by means of the outer ring

  of the motor bearing located on the side of the brushes, which, in the event of a change in the volume of the air enclosed by temperature variations, aerates the space of the slip rings closed by the encapsulation.

  The position of implanta-

  plastic capsule in the flask.

  that the electric motor is in this case predefined by the brush holder penetrating into an opening of the plastic capsule Depending on the position

  implementation of the three-phase alternator in the vehicle

  motor can be located in this way up, to the side or down

  section of the adjusting ring of the capsule in

re plastic.

  This has the disadvantage that the humidity, in particular mists loaded with salt during the coldest season can be introduced into the space of the slip rings and that it is formed thereby during the cooling of the water of condensation in

  the lower area of the plastic capsule.

  In addition to the projected water can pass through the

  ventilation channel or in any case through the

  ball bearings in the space of slip rings.

  If the level of the water in the capsule

  tick is so high that slip rings

  in the water, the alternator breaks down due to

  of the excitation winding which is then in short

  circuit. With this solution we are striving

  to ensure for the space of the slip rings of the mo-

  a jet of water on the plastic capsule by maintaining ventilation channels in the section of the adjusting ring

motor mounting position.

  Advantages of the invention The plastic capsule according to the invention is characterized by the fact that at least

  three ventilation channels are arranged by being distributed

  on the periphery of the adjusting ring section on the inner side of the adjusting ring so that at least one of these channels is as a water jet at a height below side

lower slip rings.

  This capsule has the advantage that thanks to

  many of the regularly distributed ventilation channels

  The at least one of these channels is low enough so that the water can flow into the space of the slip rings of the capsule. made of plastic by means of this

  ventilation channel Thanks to the regular arrangement

  In this way the flow of water is distributed independently of the mounting position of the electric motor. In addition, the ventilation channels guarantee ventilation in the area of the alternator which is poor in saline mist, protected by the flange of the bearing, thanks to

  in particular during the expo-

  se, during which the temperature of the air volume, enclosed in the plastic capsule of the space of the slip rings, varies regularly, the air is expelled through the ventilation channels

and is again sucked.

  According to another characteristic of the invention

  at least the three ventilation channels

  run from the section of the adjusting ring extending radially on the annular wall to the section of the space of the slip rings

  of the plastic capsule.

  According to yet another characteristic of the invention the outer ring of the bearing rests

  on a stop formed on the plastic capsule

  that, ensuring the spacing relative to the annular wall.

  According to another characteristic of the invention

  the stop is formed by an annular shoulder

  in the outer zone of the annular wall.

  According to yet another characteristic of the invention the abutment is formed by at least three

  protrusions protruding from the outer zone

  re of the annular wall, distributed regularly around the periphery, offset with respect to the ventilation channels. Thus, regardless of the distance the ball bearing is driven into the adjusting ring section of the plastic capsule, it is safe to have a water jet at

  ventilation channels, these ventilation channels

  lation extending from the adjusting ring section extending radially on the wall

  ring to the gap of slip rings.

  As long as the mounting conditions allow it

  the water jet can also be ensured by virtue of the fact that the outer ring of the bearing rests on an abutment formed on the plastic cap,

  forming the gap with respect to the annular wall.

  Drawings Exemplary embodiments of the invention

  are shown in the drawings and will be explained

  in more detail in the following description.

  In an enlarged representation, the figure

  1 shows a plastic capsule for the space

  this slip rings of a three-phase alternator

in longitudinal section.

  Figure 2 shows the plastic capsule for front view and

  Figure 3 a section of the capsule in

  plastic with a ventilation channel in a representation in space. Figure 4 shows a capsule made of

  plastic with an annular shoulder of abutment.

  Figure 5 shows a plastic capsule with three projections serving as a stop for the

outer ring of a bearing.

  Description of the embodiments

  In FIG. 1, reference is made to

  this 10 the plastic capsule according to the invention

  for the space of the slip rings of an alter-

  three-phase motor vehicle in a con-

  nue (document DE-GM 89 11 295), the three-phase alternator (not shown) is, in this case, provided in a known manner with a pole-claw armature, whose coil

  of excitation is supplied by means of brushes of char-

  good by a slip ring device.

  In this case, the pot-shaped plastic sump 10 for the space of the slip rings is located on the end section of the armature shaft behind the bearing located on the brush side, which is indicated in FIG. and designated by the reference 11 In the mounted state the plastic cap 10 is inserted into the bore of the bearing of a flange 12 of the motor located on the side of the carbons The mounting position of the plastic cap 10 is in this case predefined by the brush holder 13 to be fixed on the flange 12, indicated by dashes, brush holder which is housed by means of a sealing ring 14 in a corresponding opening 15 of the plastic capsule 10 The capsule of plastic material 10 is at its open end located on the side of the enlarged bearing to form a bearing adjusting ring section 16 for the outer ring of the bearing,

  which is connected to the section of ringspace collec-

  17 of the plastic capsule by means of a

annular wall 18.

  In connection with FIG. 2 and FIG. 3 it can be seen that above the bearing 11, the adjusting ring section 16 has on its inner side three ventilation channels 19, which are arranged in a uniformly distributed manner around the circumference. of the

  adjusting ring section 16 Ventilation channels

  19 in the adjustment ring section 16 is

  along the section of the space of the rings

  17 of the plastic capsule 10 extending radially on the annular wall 18

  radial section 19 has ventilation ducts

  themselves in the case of a very inconvenient mounting position according to Figure 2 in the section of the space of the slip rings 17 of the plastic capsule at a deep enough place, so that

  water having entered the space of the collector rings

  or the condensation water may flow before the underside of the slip rings 20 shown in dashed lines in Figure 1

  This is true only for the case in point

  particular where the bearing 11 is pressed down to the annular wall 18 in the adjusting ring section

  16 of the plastic capsule 10 Like all

  In general, it is expected that the annular wall

  18 and the bearing 11 according to Figure 1 a gap, it can not accumulate at all water in the section of the space of the slip rings 17

  of the plastic capsule because this water

  the first by the slope in the section of the adjusting ring 16 From there it flows then through the ventilation channel 19 located at the lowest in the space behind the flange 12 of the engine and then

outwards.

  FIG. 4 shows a plastic capsule 10 according to the invention partially in longitudinal section, in which the distance a between the annular wall 18 and the bearing 11 is determined by an annular shoulder 21, which is arranged in

  the outer zone of the annular wall 18 at the

  the outer ring 11a of the bearing 11, the ventilation channels 19 extending into

  this annular shoulder 21 In place of such a shoulder

  21 is formed according to Figure 5 between

  the ventilation channels 19 respectively

  lie 22 in the outer area of the annular wall

  18, evenly distributed around the perimeter.

  In these exemplary embodiments, the distance is assured

  a between the annular wall 18 of the capsule

  In the case of the most unfavorable mounting conditions, water is not collected in the section of the space of the slip rings 17 of the plastic capsule 10. The annular shoulder 21 or the projections 22 form respectively

  in this case the stop for the bearing 11.

  Instead of the three ventilation ducts, it is also possible, of course, to have several ventilation ducts that are arranged distributed regularly or irregularly around the circumference of the section of the adjusting ring 16 of the capsule.

  plastic material 10, insofar as it is

  in each mounting position at least one of the ventilation ducts 19 is at a lower height than the underside of the slip rings and that this is the guarantee

a flow of water.

Claims (4)

R E V E N D I C A T IO N S   1) Capsule made of plastic material for   slip rings of an electric motor, in particular   of a three-phase alternator for motor vehicles with a claw pole armature, the excitation winding of which is supplied by a slip ring device by means of carbon brushes, the plastic cap in the form of surrounding pot   the space of the slip rings on the terminal section   of the armature shaft behind the bearing on the side of the brushes and at the open end of the bearing side by means of an annular wall formed in front of the bearing being enlarged as a bearing adjusting ring for the ring. outer bearing as well as being provided for ventilation of the space of the slip rings of at least one ventilation channel in   the section of the adjusting ring, capsule characteris-   characterized in that at least three ventilation channels (19) are arranged distributed around the circumference of the adjusting ring section (16) on the inner side of the adjusting ring so that least one of the channels stands as a water jet at a height   below the lower side of the collector rings facilitators.   2) Plastic capsule according to the   claim 1, characterized in that at least   three ventilation channels (19) continue to   firing the section of the adjusting ring (16) extending radially on the annular wall (18) to the section of the space of the slip rings   of the plastic capsule (10).   3) Plastic capsule according to the   claim 1 or 2, characterized in that the outer race (11a) of the bearing (11) rests on a stop (21; 22) formed on the plastic cap (10), providing spacing (a) from to the annular wall (18).   4) Plastic capsule according to the   claim 3, characterized in that the stop is formed by an annular shoulder (21) in the area   outer wall of the annular wall (18).   Plastic capsule according to Claim 3, characterized in that the abutment is   formed by at least three protrusions (22)   from the outer zone of the annular wall   laire (18), distributed regularly around the perimeter,   offset with respect to the ventilation channels (19).