Wet-running bevel gear differential for an electrically operable axle drive train
A bevel gear differential includes an axis of rotation, a first differential cage having an oil opening, a second differential cage connected to the first differential cage at a first connecting region, a differential gear, first and second output gears, and a cap. The first and second differential cages are driveable to rotate about the axis of rotation. The first output gear is rotatable about the axis of rotation and meshed with the differential gear, and the second output gear is aligned with the first output gear, rotatable about the axis of rotation, and meshed with the differential gear. The cap is axially open on both axial sides. The cap surrounds the first differential cage to cover the oil opening at a distance so that a filling level of an oil within the first differential cage and the second differential cage is maintained during operation of the bevel gear differential.
1 . A wet-running bevel gear differential, comprising:
a first differential cage which is connected via a first connecting region to a second differential cage for conjoint rotation therewith;
a drive gear, each of the first differential cage and the second differential cage connected to the drive gear via the first connecting region;
a plurality of caps, each of the plurality of caps rotatably connected to the drive gear via the first connecting region and each of the plurality of caps axially open on both sides;
wherein the first differential cage and the second differential cage accommodate two output gears which are aligned with one another and both mesh with at least one differential gear;
wherein the first differential cage and the second differential cage are can be driven together so as to rotate about an axis of rotation of the two output gears which are aligned with one another
wherein a first of the plurality of caps covers an oil opening of the first differential cage and a second of the plurality of caps covers an oil opening of the second differential cage at a distance so that a filling level of an oil within the first differential cage and the second differential cage is ensured during operation of the wet-running bevel gear differential.
2 . The wet-running bevel gear differential of claim 1 , wherein
oil entering from one end of the first of the plurality of caps is guided through a first intermediate space formed between the first of the plurality of caps and the first differential cage into first differential cage, and oil entering from one end of the second of the plurality of caps is guided through a second intermediate space formed between the second of the plurality of caps and the second differential cage into the second differential cage.
3 . The wet-running bevel gear differential of claim 2 , further comprising:
a first tapered roller bearing, the first differential cage is rotatably mounted at one end via the first tapered roller bearing;
a second tapered roller bearing, the second differential cage is rotatably mounted at one end via the second tapered roller bearing;
wherein, in rotary operation of the wet-running bevel gear differential, the oil is introduced into the first intermediate space in an axial direction by a conveying effect generated by the rotation of the first tapered roller bearing, and the oil is also introduced into the second intermediate space in the axial direction by a conveying effect generated by the rotation of the second tapered roller bearing.
4 . The wet-running bevel gear differential of claim 1 , further comprising:
a second connecting region, wherein the first of the plurality of caps is connected for conjoint rotation to the at least one of the first differential cage at the second connecting region, and the second of the plurality of caps is connected for conjoint rotation to the second differential cage at the second connecting region.
5 . The wet-running bevel gear differential of claim 4 , wherein
the second connecting region includes the first connecting region.
6 . The wet-running bevel gear differential of claim 1 , wherein
each of the plurality of caps is designed as a plastic injection-molded part.
7 . The wet-running bevel gear differential of claim 1 , wherein
the first of the plurality of caps and the first differential cage have a congruent shape.
8 . The wet-running bevel gear differential of claim 1 , wherein
the first of the plurality of caps has a circumferential edge at an oil-introducing end, which determines the filling level of the oil.
9 . An electrically operable axle drive train of a motor vehicle, comprising an electric machine and the wet-running bevel gear differential of claim 1 coupled to the electric machine.
10 . A bevel gear differential, comprising:
an axis of rotation;
a first differential cage comprising an oil opening;
a second differential cage comprising an oil opening, the second differential cage connected to the first differential cage at a first connecting region, the first differential cage and the second differential cage driveable to rotate about the axis of rotation;
a drive gear, each of the first differential cage and the second differential cage connected to the drive gear via the first connecting region;
a plurality of caps, each of the plurality of caps rotatably connected to the drive gear via the first connecting region;
a differential gear;
a first output gear rotatable about the axis of rotation and meshed with the differential gear;
a second output gear, aligned with the first output gear, rotatable about the axis of rotation, and meshed with the differential gear; and
wherein each of the plurality of caps axially open on both axial sides, a first of the plurality of caps and surrounding the first differential cage to cover the oil opening of the first differential cage and a second of the plurality of caps surrounding the second differential cage to cover of the oil opening of the second differential cage at a distance so that a filling level of an oil within the first differential cage and the second differential cage is maintained during operation of the bevel gear differential.
11 . The bevel gear differential of claim 10 , further comprising an intermediate space formed between the first differential cage and the first of the plurality of caps, wherein the oil entering the first of the plurality of caps from one axial side is guided through the intermediate space and into the first differential cage.
12 . The bevel gear differential of claim 11 further comprising a tapered roller bearing, wherein:
the first differential cage comprises an end rotatably mounted on the tapered roller bearing; and
a conveying effect generated by rotation of the tapered roller bearing introduces the oil into the intermediate space during rotary operation of the bevel gear differential.
13 . The bevel gear differential of claim 12 , wherein the first of the plurality of caps is connected to the first differential cage for conjoint rotation at a second connecting region.
14 . The bevel gear differential of claim 13 wherein the second connecting region comprises the first connecting region.
15 . The bevel gear differential of claim 10 , wherein each of the plurality of caps is a plastic component formed by injection molding.
16 . The bevel gear differential of claim 10 , wherein the first of the plurality of caps and the first differential cage have a congruent shape.
17 . The bevel gear differential of claim 10 , each of the plurality of caps further comprising an oil-introducing end with a circumferential edge that determines the filling level.