DE102023203510A1 - Housing for a device in a drive train of a vehicle and device in a drive train - Google Patents

Abstract

The invention relates to a housing for a device in a drive train of a vehicle with at least one receiving device for a shaft, in particular an intermediate shaft of a transmission of an electric motor, wherein the at least one receiving device has a bearing seat with a radial inner surface and an axial inner surface extending from the radial inner surface, wherein the receiving device has a relief cut in a transition region between the radial inner surface and the axial inner surface, wherein the relief cut comprises a radial recess and/or axial recess.

Description

The invention relates to a housing for a device in a drive train of a vehicle with at least one receiving device for a shaft, in particular an intermediate shaft of a transmission of an electric motor, wherein the at least one receiving device has a bearing seat with a radial inner surface and an axial inner surface extending from the radial inner surface.

The invention further relates to a device in a drive train with a housing.

A housing for a device in a vehicle's drive train, such as a housing for a reduction gear of an electric axle drive, can be subject to particularly high stresses as a result of the transmission of torque from the engine to the output shaft. In order to ensure a high torque transmission capacity and service life of the transmission, the housing must have sufficient load-bearing capacity. To reduce drag losses and the associated reduced efficiency of the transmission, the housing should also have the highest possible rigidity. At the same time, the weight of the housing should be as low as possible.

In particular, the receiving device for supporting a shaft, such as an intermediate shaft or an output shaft, represents a housing area that is subject to particularly high stress during engine operation. The receiving device comprises the bearing seat in which a bearing can be arranged and the surrounding housing structure.

Known housings have bearing seats with rotationally symmetrical corner areas with sharp inner edges. The surrounding housing structure of the respective bearing seat is essentially formed by the housing wall. The disadvantage here is that stress concentrations or stress peaks occur in such a corner area during operation due to the sharp inner edge. Over time, these can lead to damage, particularly fatigue damage in the form of cracks. In addition, the stresses during engine operation can cause high deformations in the elements of the support device, which can result in reduced efficiency and increased drag losses in the drive device.

An object of the present invention is therefore to provide a housing for a device in a drive train with an increased load-bearing capacity and rigidity. A further object of the present invention is to provide a cost-effective and lightweight housing for a device in a drive train.

Another object of the present invention is to provide an alternative housing for a device in a drive train and an alternative device in a drive train.

In one embodiment, the present invention solves the above-mentioned problems by a housing for a device in a drive train of a vehicle with at least one receiving device for a shaft, in particular an intermediate shaft of a transmission of an electric motor, wherein the at least one receiving device has a bearing seat with a radial inner surface and an axial inner surface extending from the radial inner surface, in that the receiving device has a relief groove in a transition region between the radial inner surface and the axial inner surface, wherein the relief groove comprises a radial recess and/or axial recess.

In one embodiment, the present invention achieves the above-mentioned objects by a device in a drive train with a housing according to one of claims 1 to 10.

One possible advantage of this is that the housing has a particularly high load-bearing capacity, in particular a high fatigue strength under the long-term cyclic stress resulting from engine operation. This can be attributed to the reduced notch effect caused by the undercut and the associated lower stress concentrations or stress peaks in the transition area between the radial inner surface and the axial inner surface. This can result in an increased torque transmission capacity and service life of the device in the drive train. Furthermore, an undercut is inexpensive and easy to implement.

The term "bearing seat" is to be understood in the broadest sense and refers in particular in the claims, preferably in the description, to a substantially rotationally symmetrical recess with a radial and an axial inner surface in which a bearing, in particular a rolling bearing, can be arranged. The normal of the radial inner surface runs essentially in a radial direction of the bearing seat and the normal of the axial inner surface runs essentially in an axial direction of the bearing seat. The radial and axial inner surfaces are arranged essentially orthogonal to one another with respect to a section along the central longitudinal axis of the bearing seat, but Angles greater or smaller than 90° are also conceivable. It is also conceivable that the bearing seat has at least one groove running in the axial direction, which can be used, for example, to make it easier to replace the bearing or to secure its position.

The term "undercut" is to be understood in the broadest sense and refers in particular in the claims, preferably in the description, to a local removal on a rotationally symmetrical inner edge. The rotationally symmetrical inner edge is formed by the radial and the axial inner surface. The radial recess represents a removal in the radial direction of the bearing seat and the axial recess represents a removal in the axial direction of the bearing seat.

The term “recess radius” is to be understood in the broadest sense and refers in particular in the claims, preferably in the description, to a radius of a circular line of a contour of the undercut in a section along the central longitudinal axis of the bearing seat.

The term "cut-in depth" is to be understood in the broadest sense and refers in particular in the claims, preferably in the description, to a maximum distance of an inner surface from a point on a contour of the undercut in a section along the central longitudinal axis of the bearing seat. For the cut-in depth in the radial direction of the undercut, the maximum distance refers to the radial inner surface of the bearing seat and for the cut-in depth in the axial direction of the undercut, the maximum distance refers to the axial inner surface of the bearing seat.

The term "smooth" in relation to the term "transition" is to be understood in the broadest sense and refers in particular in the claims, preferably in the description, to a property of a surface. In particular, the term "smooth" is to be understood in the mathematical sense. A contour of a surface has no jumps, edges or the like in its course.

The term "rib" is to be understood in the broadest sense and refers in particular in the claims, preferably in the description, to an elongated elevation on the housing wall. A rib can be arranged on an inside and/or an outside of the housing wall. A rib is preferably an integral part of the housing wall and is formed in one piece with it, wherein the at least one rib has the same material as the housing wall and merges directly into it.

Further features, advantages and preferred embodiments of the invention are described below or will become apparent thereby.

According to an advantageous development, the undercut has at least one area with a first penetration radius, wherein the first penetration radius is between 0.1 and 5 mm, preferably between 1 and 3 mm, particularly preferably 2.1 mm, preferably wherein a penetration depth in the radial and/or axial direction of the undercut is between 0.1 and 1.5 mm, preferably between 0.25 and 1 mm, particularly preferably 0.5 mm. An undercut with an area with such a radius is particularly simple and cost-effective to produce. In addition, the stress concentration can be significantly reduced in comparison to a sharp inner edge.

According to an advantageous further development, the undercut has a smooth transition to the radial inner surface and/or axial inner surface. This allows stress concentrations to be further reduced and a more even stress distribution to be achieved in the area of the undercut. This contributes to increasing the load-bearing capacity of the bearing seat.

According to an advantageous development, the undercut has an area with at least a second recess radius and at least two areas with the first recess radius, with an area with the first recess radius adjoining the area with the second recess radius on both sides, in particular with the second recess radius being larger than the first recess radius. One of the advantages achieved in this way is that stress concentrations can be further reduced and a more uniform stress distribution can be achieved in the area of the undercut. This contributes to increasing the load-bearing capacity of the bearing seat.

According to an advantageous development, the bearing seat is designed to support a rolling bearing, in particular an angular contact roller bearing. This means that stresses acting in the radial direction of the rolling bearing can be transferred from the shaft to the housing. In addition to stresses in the radial direction, angular contact roller bearings can also absorb stresses in the axial direction. A bearing seat designed to support an angular contact roller bearing thus enables stresses acting in the axial direction to be transferred from a shaft to the housing.

According to an advantageous development, the bearing seat has an axial centric recess which is designed such that a centering tool for the centric arrangement of a shim can be introduced into the axial centric recess between the rolling bearing and the bearing seat, the axial centric recess having a shape that at least partially corresponds to the centering tool. A centrally inserted shim can achieve an even distribution of the stresses on the bearing seat. This leads to a longer service life of the rolling bearing and/or the bearing seat.

According to an advantageous development, the bearing seat has an inner diameter of between 10 and 20 cm, preferably between 12.5 and 17.5 cm, particularly preferably 15 cm. This means that sufficiently large rolling bearings can be used to ensure a high load-bearing capacity and service life. At the same time, a space-saving design can be achieved by limiting the inner diameter and thus the bearing seat size.

According to an advantageous development, the receiving device has at least one rib. The arrangement of at least one rib can increase the load-bearing capacity and rigidity of the housing. The increased rigidity and the associated lower deformation of the receiving device during engine operation can reduce deformation of adjacent moving components, such as the bearing or the shaft mounted above it. This can reduce drag losses and increase the efficiency of the device in a drive train. In addition, the at least one rib can be used to create a construction with a low dead weight.

According to an advantageous development, the at least one rib comprises at least one radial rib, wherein the at least one radial rib extends in the radial direction starting from the bearing seat, and/or at least one curved rib, wherein the at least one curved rib is arranged concentrically around the bearing seat, preferably wherein the at least one curved rib has a circular or elliptical arc shape. This makes it possible to achieve a uniform stress distribution in the bearing seat, which results in a higher load-bearing capacity and service life of the bearing seat.

According to an advantageous development, the receiving device has at least two ribs, wherein the at least two ribs at least partially merge into one another. This makes it possible to avoid tapered rib ends, at which high stress concentrations can occur in a transition area to the housing wall and which can lead to a reduced load-bearing capacity and service life of the housing.

Further important features and advantages of the invention emerge from the subclaims, from the drawings, and from the associated description of the figures based on the drawings.

It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

Preferred embodiments and embodiments of the invention are shown in the drawings and are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical components or elements.

• 1 eine räumliche Ansicht eines Teils eines Gehäuses gemäß einer Ausführungsform der vorliegenden Erfindung; und
• 2 eine weitere räumliche Ansicht eines Teils eines Gehäuses gemäß einer Ausführungsform der vorliegenden Erfindung; und
• 3 einen Ausschnitt einer Schnittdarstellung im Bereich einer Welle einer Getriebeeinrichtung gemäß einer Ausführungsform der vorliegenden Erfindung; und
• 4 einen Ausschnitt einer Schnittdarstellung im Bereich eines Lagersitzes eines Gehäuses gemäß einer Ausführungsform der vorliegenden Erfindung.

In schematic form

• 1 a spatial view of a part of a housing according to an embodiment of the present invention; and
• 2 a further spatial view of a part of a housing according to an embodiment of the present invention; and
• 3 a detail of a sectional view in the area of a shaft of a transmission device according to an embodiment of the present invention; and
• 4 a detail of a sectional view in the region of a bearing seat of a housing according to an embodiment of the present invention.

The 1 and 2 each show a spatial view of a part of a housing according to an embodiment of the present invention. 1 shows the inside 2 and 2 the outer side 3 of the part of the housing 1 of a transmission device for an electric axle drive.

The housing 1 in 1 has three receiving devices 4a, 4b, 4c for each shaft 5 (see 3 ). Each receiving device 4a, 4b, 4c has a bearing seat 6a, 6b, 6c with a radial inner surface 7a, 7b, 7c and an axial inner surface 8a, 8b, 8c. The axial inner surface 8a, 8b, 8c extends from the radial inner surface 7a, 7b, 7c. Each receiving device 4a, 4b, 4c also has at least one groove 9a, 9b, 9c running in the axial direction on the circumference for easier replacement of a rolling bearing 10.

The receiving devices 4a, 4b, 4c each have in a transition area between the radial inner surface 7a, 7b, 7c and the axial Inner surface 8a, 8b, 8c has a relief 11a, 11b, 11c.

Ribs 12 are arranged on both the inner side 2 and the outer side 3 of the housing 1. The receiving device 4c comprises both radial ribs 13 and curved ribs 14. The radial ribs 13 extend, as can be seen from 2 visible, starting from the bearing seat 6a in the radial direction and are arranged at least partially equidistant from one another in the circumferential direction. The curved ribs 14 are arranged concentrically around the bearing seat 6a and partially cross the radial ribs 13.

The bearing seat 6b has an axial centric recess 15 which is designed such that a centering tool for the centric arrangement of a shim between the rolling bearing 10 and the bearing seat 6b can be introduced into the axial centric recess 15.

3 shows a detail of a sectional view in the region of a shaft of a transmission device according to a further embodiment of the present invention.

In 3 a shaft 5 is shown, one end of the shaft 5 being arranged in a bearing seat 6 of a receiving device 4 via an angle roller bearing 10. The bearing seat 6 has a radial inner surface 7 and an axial inner surface 8 with which the angle roller bearing 10 is in contact. The angle roller bearing 10 comprises an inner ring 16, an outer ring 17 and rollers 18 located between them.

The receiving device 4 also has a relief groove 11 with a radial recess 19. The radial recess 19 runs in the radial direction of the bearing seat 6 and thus in the radial direction of the shaft 5.

The bearing seat 6 has an inner diameter of 24.

4 shows a detail of a sectional view in the area of the bearing seat of a housing according to a further embodiment of the present invention.

The one in 4 The section shown runs along a central longitudinal axis 23 of the bearing seat 6.

The receiving device 4 has a relief groove 11 in the radial direction with a region with a first recess radius 20, wherein the relief groove 11 has a recess depth 21 in the radial direction. The recess depth 21 is here the greatest distance between the radial inner surface 7 and a point on a contour 22 of the relief groove 11.

In addition, the bearing seat 6 has an axial centric recess 15 for a centering tool for the centric arrangement of a shim and a groove 9.

• - Höhere Steifigkeit und Tragfähigkeit.
• - Höhere Lebensdauer.
• - Niedriges Eigengewicht.
• - Platzsparende Konstruktion.
• - Einfache und kostengünstige Konstruktion.
• - Geringere Schleppverluste der Einrichtung in einem Antriebsstrang.
• - Höherer Wirkungsgrad der Einrichtung in einem Antriebsstrang.

In summary, at least one of the embodiments of the invention has at least one of the following features and/or at least one of the following advantages:

• - Higher rigidity and load-bearing capacity.
• - Longer service life.
• - Low weight.
• - Space-saving design.
• - Simple and cost-effective construction.
• - Lower drag losses of the device in a drive train.
• - Higher efficiency of the device in a drive train.

Although the present invention has been described using preferred embodiments, it is not limited thereto but can be modified in many ways.

reference sign

1

Housing

2

inside of the housing 1

3

outside of the housing 1

4, 4a, 4b, 4c

reception facility

5

shaft, intermediate shaft

6, 6a, 6b, 6c

bearing seat

7, 7a, 7b, 7c

radial inner surface

8, 8a, 8b, 8c

axial inner surface

9, 9a, 9b, 9c

Nut

10

rolling bearings, tapered roller bearings

11, 11a, 11b, 11c

undercut

12

rib

13

radial rib

14

arch rib

15

Axial centric recess

16

inner ring of the rolling bearing 10

17

outer ring of the rolling bearing 10

18

rollers of the rolling bearing 10

19

radial puncture

20

penetration radius

21

penetration depth

22

contour of the undercut 4

23

Central longitudinal axis of the bearing seat 6

24

inner diameter of the bearing seat 6

Claims (11)

Housing (1) for a device in a drive train of a vehicle with at least one receiving device (4) for a shaft (5), in particular an intermediate shaft (5) of a transmission of an electric motor, wherein the at least one receiving device (4) has a bearing seat (6) with a radial inner surface (7) and an axial inner surface (8) extending from the radial inner surface (7), characterized in that the receiving device (4) has a relief cut (11) in a transition region between the radial inner surface (7) and the axial inner surface (8), wherein the relief cut (11) comprises a radial recess (19) and/or axial recess. Housing (1) after claim 1 , characterized in that the undercut (11) has at least one region with a first puncture radius (20), wherein the first puncture radius (20) is between 0.1 and 5 mm, preferably between 1 and 3 mm, particularly preferably 2.1 mm, preferably wherein a puncture depth (21) in the radial and/or axial direction of the undercut (11) is between 0.1 and 1.5 mm, preferably between 0.25 and 1 mm, particularly preferably 0.5 mm. Housing (1) after claim 2 , characterized in that the undercut (11) has a smooth transition to the radial inner surface (7) and/or axial inner surface (8). Housing (1) after claim 2 or 3 , characterized in that the undercut (11) has a region with at least a second puncture radius and at least two regions with the first puncture radius, wherein on both sides of the region with the second puncture radius there is in each case a region with the first puncture radius, in particular wherein the second puncture radius is larger than the first puncture radius. Housing (1) according to one of the Claims 1 until 4 , characterized in that the bearing seat (6) is designed to support a rolling bearing (10), in particular an angular contact roller bearing (10). Housing (1) after claim 5 , characterized in that the bearing seat (6) has an axial centric recess (15) which is designed such that a centering tool for the centric arrangement of a compensating disk between the rolling bearing (10) and the bearing seat (6) can be introduced into the axial centric recess (15), wherein the axial centric recess (15) has a shape which at least partially corresponds to the centering tool. Housing (1) according to one of the Claims 1 until 6 , characterized in that the bearing seat (6) has an inner diameter (24) between 10 and 20 cm, preferably between 12.5 and 17.5 cm, particularly preferably 15 cm. Housing (1) according to one of the Claims 1 until 7 , characterized in that the receiving device (4) has at least one rib (12). Housing (1) after claim 8 , characterized in that the at least one rib (12) comprises at least one radial rib (13), wherein the at least one radial rib (13) extends in the radial direction starting from the bearing seat (6), and/or comprises at least one curved rib (14), wherein the at least one curved rib (14) is arranged concentrically around the bearing seat (6), preferably wherein the at least one curved rib (14) has a circular or elliptical arc shape. Housing (1) after claim 8 or 9 , characterized in that the receiving device (4) has at least two ribs (12), wherein the at least two ribs (12) at least partially merge into one another. Device in a drive train with a housing (1) according to one of the Claims 1 until 10 .

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