Housing partition plate and engine-transmission assembly

Abstract

The utility model relates to a shell partition plate and an engine-transmission-assembly, the shell partition plate is provided with a bearing seat, the bearing seat is used for axially and radially supporting a helical tooth type gear, the gear is connected with an intermediate shaft in an anti-torque mode and is meshed with a driven gear, and the driven gear is also provided with helical teeth. Wherein the bearing seat is spaced from at least one through hole in the shell partition plate. In order to improve the service life of the housing partition during operation, the bearing block has a disc-shaped load surface which is surrounded by a cylindrical outer-cover-shaped radial bearing body which is integrally connected to an umbrella-shaped reinforcing structure in a peripheral region facing away from the disc-shaped load surface, an umbrella-shaped reinforcing structure connects the radial bearing body in a force-transmittable manner to a diaphragm body surrounding the bearing block radially outside, such that the stiffness of the housing diaphragm is effectively increased in a critical region between the bearing block and the through-hole when an axial force acts on the disc-shaped load surface during normal operation.

Description

Technical Field

[0001] The utility model relates to a housing partition with a bearing seat, the bearing seat is used for axially and radially supporting a helical gear, the gear is connected to an intermediate shaft in a rotationally fixed manner and meshes with a driven gear, which is also a helical gear, wherein the bearing seat is spaced apart from at least one through hole in the housing partition. The utility model also relates to an engine-transmission assembly with such a housing partition. Background Art

[0002] German laid-open patent application DE 10 2020 124 375 A1 discloses a multi-speed transmission for a motor vehicle having a plurality of shafts and housing parts. German patent application DE 11 2010 003 313 B4 discloses a motor vehicle transmission having two housing parts, between which a partition plate is arranged. Utility Model Content

[0003] The technical problem to be solved by the present invention is to increase the service life of a housing partition during operation of an engine-transmission assembly equipped with the housing partition.

[0004] In a housing partition with a bearing seat, the bearing seat is used to axially and radially support a helical gear, which is connected to the intermediate shaft in a rotationally fixed manner and meshes with a driven gear, which is also helical, wherein the bearing seat is spaced apart from at least one through hole in the housing partition, the technical problem is solved in that the bearing seat has a disk-shaped load surface, which is surrounded by a radial bearing body in the form of a cylindrical shell, and the radial bearing body is connected in one piece to an umbrella-shaped reinforcement structure at the peripheral area facing away from the disk-shaped load surface, and the umbrella-shaped reinforcement structure connects the radial bearing body in a force-transmitting manner to the partition body surrounding the bearing seat radially on the outside so that when an axial force acts on the disk-shaped load surface in normal operation, the rigidity of the housing partition is effectively increased in the critical area between the bearing seat and the through hole. In normal operation, the axial force is caused by the meshing helical gears. A drive shaft arranged coaxially with the intermediate shaft passes through the through hole in the housing partition. The drive shaft is preferably a drive shaft driven by an electric motor. The drive shaft, which is arranged coaxially with the intermediate shaft, is preferably supported in a floating manner in the region of the through-hole. Supporting axial forces in the region of the through-hole is difficult or impossible. Undesirable deformations in the region of the joint between the bearing seat and the through-hole can be significantly reduced by the umbrella-shaped reinforcement. Additional structural costs, which are caused in particular by the severely restricted structural space in the region of the bearing seat, are deliberately saved.

[0005] A preferred embodiment of the housing diaphragm is characterized in that the umbrella-shaped reinforcement structure is at an angle of thirty to sixty degrees to the radial bearing body. The angle refers to the mutually diverging angled outer surfaces of the umbrella-shaped reinforcement structure and the radial bearing body. Particularly preferably, the angle is forty to forty-five degrees. The claimed angle can reduce the effect of axial forces acting on the housing diaphragm in critical areas.

[0006] Another preferred embodiment of the housing partition is characterized in that the gear connected to the intermediate shaft in a rotationally fixed manner has an annular space formed between the sleeve body and the toothing body, in which the radial bearing body with the rolling bearing and the umbrella-shaped reinforcement structure are arranged. In this way, the limited installation space is optimally utilized. The rolling bearing is advantageously designed as a tapered bearing, which can axially and radially support the gear connected to the intermediate shaft in a rotationally fixed manner.

[0007] Another preferred embodiment of the housing partition is characterized in that the housing partition has an annular surface with an additional reinforcement structure on the side facing away from the radial bearing body with the umbrella-shaped reinforcement structure. By combining the umbrella-shaped reinforcement structure on one side of the housing partition with the additional reinforcement structure on the other side, the rigidity can be effectively increased, especially in the critical area between the bearing seat and the through-opening.

[0008] Another preferred embodiment of the housing diaphragm is characterized in that the additional reinforcement structure comprises two coaxial annular bodies which are connected to one another in a spoke-like manner via additional ribs. This design has been found to be particularly effective in achieving the desired increase in rigidity.

[0009] Another preferred embodiment of the housing intermediate plate is characterized in that the umbrella-shaped reinforcement structure is arranged radially inside the annular surface with the additional reinforcement structure in a top view looking at the load surface. The term radial refers to the axis of rotation of the intermediate shaft. Due to the radial overlap of the umbrella-shaped reinforcement structure and the additional reinforcement structure, the rigidity can be increased effectively in the desired manner.

[0010] Another preferred embodiment of the housing intermediate plate is characterized in that the housing intermediate plate is fastened to a motor housing part which surrounds a stator winding which is arranged at a predetermined distance from a load surface on the housing intermediate plate in order to maintain a defined air gap and creepage distance. The stator winding is arranged on the side of the housing intermediate plate facing away from the load surface. Due to the higher rigidity of the housing intermediate plate, the housing intermediate plate can advantageously be designed with a smaller wall thickness than conventional housing intermediate plates.

[0011] Another preferred embodiment of the housing partition is characterized in that the housing partition is implemented as a casting. In the casting, the above-mentioned parts or regions of the housing partition, such as the disk-shaped load surface, the radial bearing body, the peripheral area, the umbrella-shaped reinforcement structure and the additional reinforcement structure are connected to each other in one piece.

[0012] Another preferred embodiment of the housing partition is characterized in that the housing partition has an annular groove with a concave annular cross section on the side facing away from the peripheral area. As a result, material can be saved here without significantly impairing the rigidity at this location.

[0013] The utility model also relates to an engine-transmission assembly having the above-mentioned housing partition. The engine-transmission assembly advantageously comprises at least one electric motor as a drive. The engine-transmission assembly can also comprise two electric motors as drives. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Further advantages, features and details of the present invention are derived from the following description, in which different embodiments are described in detail with reference to the accompanying drawings. Therein:

[0015] Figure 1 A perspective sectional view of an engine-transmission assembly having a housing partition with an umbrella-shaped reinforcement structure is shown;

[0016] Figure 2 Shows Figure 1 The enlarged part in the figure clearly shows the force transmission through the umbrella-shaped reinforcement structure;

[0017] Figure 3 Shown is an umbrella-shaped reinforcement structure Figure 1 A portion of the figure, but the gear supported by the rolling bearing is not shown;

[0018] Figure 4 Shows Figure 3 A perspective view of the housing partition in FIG. 1 , looking toward the additional reinforcement structure, which is formed on a side of the housing partition facing away from the umbrella-shaped reinforcement structure; and

[0019] Figure 5 A perspective view of a housing intermediate wall is shown in a top view onto a bearing support having an umbrella-shaped reinforcement structure. DETAILED DESCRIPTION

[0020] exist Figure 1 1 shows a perspective view of an engine-transmission assembly 1. The engine-transmission assembly 1 comprises at least one electric machine with a driven shaft. A driven gear 11 is connected to the driven shaft in a rotationally fixed manner. The driven gear 11 meshes with a gear 9 which is connected to an intermediate shaft 10 in a rotationally fixed manner.

[0021] The two gears 9, 11 meshing with each other have helical teeth. This results in an axial bearing force 17 acting on the load surface 7 during normal operation of the motor-transmission assembly 1, which is formed on the housing intermediate wall 2 in the region of the bearing seat 8. The housing intermediate wall 2 separates the motor space 3 from the wet chamber 4 in the motor-transmission assembly 1, in which the two gears 9 and 11 mesh with each other.

[0022] The stator winding 6 of the electric machine is arranged in the motor space 3 at a relatively small distance from the housing intermediate wall 2 with the load surface 7. As a result, defined air gaps and creepage distances must be maintained in this area. This also applies in particular when axial forces 17 act on the load surface 7 at the housing intermediate wall 2.

[0023] exist Figure 5 Only the housing partition 2 is shown in a perspective view looking at the load surface 7 in the bearing seat 8. The bearing seat 8 and the load surface 7 are at a relatively small distance from the through hole 12 in the housing partition 2.

[0024] The through hole 12 is used, for example, to pass through an output shaft which is connected in a rotationally fixed manner to the output gear 11. The housing intermediate wall 2 is provided with an umbrella-shaped reinforcement structure 15 in order to increase the rigidity of the housing intermediate wall 2 in a targeted manner in a critical area 28.

[0025] The housing partition 2 comprises a radial bearing body 13 for forming a bearing seat 8. The radial bearing body 13 is integrally connected to an umbrella-shaped reinforcement structure 15 at a peripheral region 14. The umbrella-shaped reinforcement structure 15 in turn integrally connects the radial bearing body 13 to a partition body 16 of the housing partition 2, which surrounds the bearing seat 8.

[0026] The gear 9 connected to the intermediate shaft 10 in a rotationally fixed manner comprises a sleeve body 19 which is integrally connected to a toothing body 20. The sleeve body 19 and the toothing body 20 of the gear 9 define an annular space 21 in which a rolling bearing 22 is arranged in addition to the umbrella-shaped reinforcement structure 15 and the radial bearing body 13.

[0027] The rolling bearing 22 is designed as a tapered bearing and serves to support the gear wheel 9 radially and axially on the housing intermediate wall 2. In normal operation, an axial bearing force 17 is exerted on the load surface 7 of the housing intermediate wall 2 by the helical gear wheels 9, 11.

[0028] exist Figure 2 The slightly thicker lines in the figure show how the force transmission line 18 can conduct the axial force via the umbrella-shaped reinforcement structure 15. Figure 5 The loads in the critical area 28 are reduced. The wall thickness of the housing partition 2 in the umbrella-shaped reinforcement structure 15 is also advantageously reduced as a result.

[0029] exist Figure 1It can be seen that the housing intermediate plate 2 has an annular groove 29 in the umbrella-shaped reinforcement structure 15 on the side opposite the peripheral region 14. The annular groove 29 is provided with a rounding which can be easily produced on the housing intermediate plate 2 in a casting method.

[0030] exist Figure 3 and Figure 4 The housing partition 2 with the umbrella-shaped reinforcement structure 15 is shown only in a perspective view. Figure 4 It can be seen that the housing intermediate wall 2 has an additional reinforcement structure 27 on its side facing away from the umbrella-shaped reinforcement structure 15. The additional reinforcement structure 27 faces the motor space 3, while the umbrella-shaped reinforcement structure 15 faces the wet chamber 4.

[0031] exist Figure 4 As can be seen in FIG. 2 , the additional reinforcement structure 27 comprises two coaxial first annular bodies 24 and second annular bodies 25, which are connected to each other in a web-like manner via additional ribs 26. Figure 1 It can be seen in FIG. 1 that the umbrella-shaped reinforcement structure 15 is arranged radially overlapping with the annular surface 23 having the additional reinforcement structure 27 .

[0032] In the casting simulations carried out on the housing diaphragm 2 in the present invention, it has been found that the housing diaphragm 2 is subjected to very high loads in the critical region 28. This is due in particular to the fact that the axial force 17 generates a moment which causes an undesirable deformation of the housing diaphragm 2 in the critical region 28 and also an undesirable tilting of the bearing seat 8 on the housing diaphragm 2. Both have a negative effect on the service life of the housing diaphragm 2 during operation.

[0033] The umbrella-shaped reinforcement structure 15 on the housing intermediate wall 2, in particular in combination with the additional reinforcement structure 27, can significantly reduce the load in the critical area 28. This allows the deformation of the housing intermediate wall 2 during operation under load to be effectively stabilized. In addition, undesired tilting of the bearing seat 8 can be effectively prevented. The wall thickness at the housing intermediate wall 2 can also be reduced. The weight reduction of the cast housing intermediate wall 2 associated with this can reach the kilogram level.

[0034] Reference numerals list

[0035] 1 Engine-Transmission-Components

[0036] 2 Shell partition

[0037] 3 Motor space

[0038] 4 wet room

[0039] 5 Motor housing parts

[0040] 6 Stator winding

[0041] 7 Loading surface

[0042] 8 Bearing seat

[0043] 9 Gear

[0044] 10 Intermediate shaft

[0045] 11 Gear

[0046] 12 Through Holes

[0047] 13 Radial bearing body

[0048] 14 Peripheral area

[0049] 15 Umbrella-shaped reinforcement structure

[0050] 16 Bulkhead body

[0051] 17 Axial force

[0052] 18 Force transmission device

[0053] 19 Sleeve body

[0054] 20 meshing body

[0055] 21 Ring Space

[0056] 22 Rolling bearings

[0057] 23 Torus

[0058] 24 First Ring

[0059] 25 Second Ring

[0060] 26 Additional ribs

[0061] 27 Additional reinforcement structure

[0062] 28 Key Areas

[0063] 29 Annular groove

Claims

1. A housing partition (2) having a bearing seat (8) for axially and radially supporting a helical gear (9), which is connected to an intermediate shaft (10) in a rotationally fixed manner and meshes with a driven gear (11), which is also helical, wherein the bearing seat (8) is spaced apart from at least one through hole (12) in the housing partition (2), characterized in that: The bearing seat (8) has a disk-shaped load surface (7), which is surrounded by a cylindrical outer cover-shaped radial bearing body (13), and the radial bearing body (13) is integrally connected to an umbrella-shaped reinforcement structure (15) at a peripheral area (14) facing away from the disk-shaped load surface (7). The umbrella-shaped reinforcement structure (15) connects the radial bearing body (13) to a partition body (16) surrounding the bearing seat (8) radially on the outside in a force-transmitting manner so that when an axial force (17) acts on the disk-shaped load surface (7) in normal operation, the rigidity of the housing partition (2) in a critical area (28) between the bearing seat (8) and the through hole (12) is effectively increased.

2. The housing partition according to claim 1, characterized in that: The umbrella-shaped reinforcement structure (15) forms an angle of thirty to sixty degrees with the radial bearing body (13).

3. The housing partition according to claim 1 or 2, characterized in that The helical gear (9) connected to the intermediate shaft (10) in a rotationally fixed manner has an annular space (21) formed between a sleeve body (19) and a toothing body (20), and a radial bearing body (13) having a rolling bearing (22) and the umbrella-shaped reinforcement structure (15) are arranged in the annular space (21).

4. The housing partition according to claim 1, characterized in that The housing intermediate wall (2) has an annular surface (23) with an additional reinforcement structure (27) on a side facing away from the radial bearing body (13) with the umbrella-shaped reinforcement structure (15).

5. The housing partition according to claim 4, characterized in that: The additional reinforcement structure (27) comprises two coaxial first annular bodies (24) and second annular bodies (25), which are connected to each other in a spoke-like manner via additional ribs (26).

6. The housing partition according to claim 4 or 5, characterized in that: The umbrella-shaped reinforcement structure (15) is arranged radially inside the annular surface (23) having the additional reinforcement structure (27) in a plan view toward the load surface (7).

7. The housing partition according to claim 1, characterized in that The housing partition (2) is fixed to a motor housing component (5), and the motor housing component (5) surrounds a stator winding (6), and the stator winding has a preset spacing from a load surface (7) on the housing partition (2) to maintain a defined air gap and creepage distance.

8. The housing partition according to claim 1, characterized in that The housing partition (2) is a casting.

9. The housing partition according to claim 1, characterized in that The housing intermediate wall (2) has an annular groove (29) with a concave annular cross section on a side facing away from the peripheral region (14).

10. An engine-transmission assembly (1), characterized in that The motor-transmission assembly has a housing partition (2) according to one of the preceding claims.

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