Electric drive module and hybrid system

Abstract

Electric drive module comprising a hollow housing (1, 10), an electric motor, a cooling arrangement (20), a clutch and an actuator (6, 60) for clutch actuation, wherein the electric motor and the clutch are mounted in the hollow housing (1, 10), wherein the cooling arrangement (20) has a bottom wall (21) and a cooling liquid sleeve (3, 22) extending from the bottom wall (21) and integrated therewith, the cooling liquid sleeve (3, 22) has tabs (4, 40) at the end opposite the bottom wall (21), these tabs (4, 40) are fastened to one end of the hollow housing (1, 10), and the main body of the cooling liquid sleeve (3, 22) is sealingly mounted in the hollow housing (1, 10) by means of a sealing ring (5, 50), characterized in that the actuator (6, 60) is radially and axially connected to the Cooling fluid sleeve (3, 22) is arranged in a nested manner, the bottom wall (21) has an opening and the actuator (6, 60) of the clutch is mounted on the opening so thatthat the reaction forces of the actuator (6, 60) are absorbed by the cooling arrangement (20).,

Description

field of technology

[0001] This invention relates to the field of vehicles, more particularly to a hybrid drive system, and provides an electric drive module and a hybrid drive system. State of the art

[0002] In the course of developing hybrid vehicles, a variety of hybrid drive systems have already been developed. LuK, a company within the Schaeffler Group, developed a P2 hybrid drive system that includes an electric drive module located between the engine and the transmission. Such an electric drive module comprises a housing, an electric motor, a coolant sleeve, and a clutch. The electric drive module is coupled to the engine via the clutch, and the electric motor is coupled to the transmission. The electric motor enables the engine to start and stop.

[0003] The housings of electric drive modules in current P2 hybrid drive systems are hollow structures, usually made of aluminum alloys. To mount the clutch actuator 6, as shown in Fig. 1, a partition 2 is provided in the housing 1, and the partition 2 has an opening available for mounting the actuator 6. The cooling fluid sleeve 3 has tabs 4 at the end opposite the partition 2, which are fastened to one end of the housing 1 by means of fastening bolts 7, and the main body of the cooling fluid sleeve 3 is mounted in the housing by means of the sealing ring 5.

[0004] Since the rigidity and strength of aluminum alloys are limited, the performance of the housing 1 is restricted. To ensure that the housing 1 has sufficient rigidity and strength, the partition wall 2 must have a relatively large thickness. Thus, the axial length of the electric drive module is limited by the thickness of the partition wall 2. Furthermore, since the housing 1 has the partition wall 2, the casting technology of the housing 1 is relatively complicated and costly. In addition, thick-walled pipes are required as raw materials to manufacture the cooling fluid sleeve 3 having the tabs 4, which leads to material waste.

[0005] From DE 10 2012 205 754 A1 an electric drive module is known which can be read in the preamble of claim 1. Subject of the invention

[0006] The object of this invention is to avoid the problems mentioned.

[0007] According to the invention, this object is achieved by an electric drive module according to claim 1 and a hybrid system according to claim 6. Preferred embodiments are set out in the dependent claims.

[0008] According to the invention, an electric drive module is provided which comprises a hollow housing, an electric motor, a cooling arrangement and a clutch, wherein the electric motor and the clutch are mounted in the hollow housing, the cooling arrangement has a bottom wall and a cooling fluid sleeve extending from the bottom wall and integrated therewith, the cooling fluid sleeve has tabs at the end opposite the bottom wall which are fastened to one end of the hollow housing, and the main body of the cooling fluid sleeve is sealingly mounted in the hollow housing by means of a sealing ring, furthermore the bottom wall has an opening and the actuator of the clutch is mounted on the opening.

[0009] In an embodiment according to the invention, the cooling arrangement is manufactured from sheet steel by deep drawing.

[0010] In an embodiment according to the invention, the cooling arrangement is designed as a tubular element with a Z-shaped cross-section and flange.

[0011] Preferably, the tabs have through holes and the fixing bolts can pass through the through holes to fix the tabs to one end of the housing.

[0012] Preferably, holes are provided around the perimeter of the base wall opening, and the mounting bolts can pass through the holes to facilitate the installation of the actuator. This allows the reaction forces required during clutch operation to be absorbed.

[0013] Preferably, the sealing ring is inserted between the inner wall of the housing and the main body of the cooling liquid sleeve.

[0014] According to the invention, a cooling arrangement for an electric drive module is also provided, wherein the cooling arrangement has a bottom wall and a cooling liquid sleeve extending from the bottom wall and integrated therewith, the cooling liquid sleeve has tabs at the end opposite the bottom wall, and the bottom wall also has an opening.

[0015] Preferably, the tabs have through openings.

[0016] According to the invention, a hybrid drive system is also provided which comprises a motor and an above-mentioned electric drive module, wherein one end of the electric drive module is coupled to the motor via the clutch.

[0017] The concept of this invention is that the intermediate wall of the housing of an electric drive module of a traditional P2 hybrid drive system forms an integrated cooling arrangement with a cooling liquid sleeve and a connection is then made between the two parts, cooling arrangement and housing, for example by bolts.

[0018] Since the housing no longer has a partition wall, the invention simplifies the casting technology of the housing. Furthermore, since the cooling assembly is made of steel, the rigidity and strength of the bottom wall of the cooling assembly are increased compared to the partition wall of the traditional housing, allowing a reduction in the thickness of the bottom wall, thereby reducing the axial length of the electric drive module. Furthermore, manufacturing the cooling assembly by deep drawing from sheet steel also increases the utilization rate of the manufacturing materials. Description of the drawings

[0019] The embodiments of this invention are described in more detail in the drawings, wherein Fig. Figure 1 is a sectional view of a prior art electric drive module, showing only the housing and coolant sleeve and the clutch actuator for clarity; Fig. 2 shows a perspective view of a cooling arrangement of an embodiment according to the invention; Fig. 3 shows a sectional view of an electric drive module of an embodiment according to the invention, wherein for reasons of clarity only the housing and the cooling arrangement as well as the actuator of the clutch are shown. Concrete embodiments

[0020] The embodiments of the invention are described below with reference to drawings 2 to 3.

[0021] How Fig. 2, the cooling assembly 20 of the embodiment of this invention comprises a bottom wall 21 and a cooling liquid sleeve 22 extending from the bottom wall 21 and integrated therewith, and this cooling liquid sleeve 22 has a plurality of tabs 40 at the end opposite the bottom wall 21. The bottom wall 21 has an opening, a plurality of holes are provided on the periphery of the opening, fastening bolts can pass through these holes to facilitate the mounting of the actuator 60 (see Fig. 3). The tabs 40 also have through holes, the fastening bolts 70 (see Fig. 3) can pass through these through holes to attach the tabs to one end of the housing 10.

[0022] The Fig. The cooling arrangement 20 shown in Figure 2 is made of sheet steel by deep drawing, whereby a tubular element with a Z-shaped cross section is produced by deep drawing, and precisely this flange is used for the formation of the tabs 40, thereby increasing the degree of utilization of the manufacturing materials.

[0023] Fig. 3 shows an electric drive module of an embodiment of this invention, which comprises a hollow housing 10, an electric motor (not shown), a cooling arrangement 20 and a clutch (not shown), wherein the cooling arrangement 20 has a bottom wall 21 and a cooling liquid sleeve 22 extending from the bottom wall 21 and integrated therewith, this cooling liquid sleeve 22 has tabs 40 at the end opposite the bottom wall 21, which tabs are fastened to one end of the housing 10 by means of fastening bolts 70 and the main body of the cooling liquid sleeve 22 is mounted in the hollow housing 10, furthermore the bottom wall 21 has an opening and the actuator 60 of the clutch is mounted on this opening.

[0024] Fig.3 also shows that the electric drive module further includes a sealing ring 50 inserted between the inner wall of the housing 10 and the main body of the cooling liquid sleeve 22 to provide a seal between the housing 10 and the cooling liquid sleeve 22.

[0025] Under these circumstances, the features mentioned in the description can be used independently of other features. Furthermore, the features mentioned in the description can also be combined as needed, thereby providing various combinations.

[0026] The drawings and the corresponding explanations serve only to describe the concept of this invention. The details of this invention may vary within the scope of the patent claims. List of reference symbols 1 housing 2 Housing partition 3 Coolant sleeve 4 tabs 5 Sealing ring 6 Clutch actuator 7 fastening bolts 10 housings 20 Cooling arrangement 21 Floor wall 22 Coolant sleeve 40 tabs 50 sealing ring 60 Clutch actuator 70 fastening bolts

Claims

[1] An electric drive module comprising a hollow housing (1, 10), an electric motor, a cooling arrangement (20), a clutch, and an actuator (6, 60) for clutch actuation, wherein the electric motor and the clutch are mounted in the hollow housing (1, 10), wherein the cooling arrangement (20) has a bottom wall (21) and a cooling fluid sleeve (3, 22) extending from the bottom wall (21) and integrated therewith, the cooling fluid sleeve (3, 22) has tabs (4, 40) at the end opposite the bottom wall (21), these tabs (4, 40) are fastened to one end of the hollow housing (1, 10), and the main body of the cooling fluid sleeve (3, 22) is sealingly mounted in the hollow housing (1, 10) by means of a sealing ring (5, 50), characterized bythat the actuator (6, 60) is arranged radially and axially nested with the cooling liquid sleeve (3, 22), the bottom wall (21) has an opening and the actuator (6, 60) of the coupling is mounted on the opening such that the reaction forces of the actuator (6, 60) are absorbed by the cooling arrangement (20). [2] Electric drive module according to claim 1, characterized by that the cooling arrangement (20) is made of steel. [3] Electric drive module according to claim 1 or 2, characterized by that the cooling arrangement (20) is made of sheet steel by deep drawing. [4] Electric drive module according to claim 1 or 2, characterized by that the tabs (4, 40) have through holes and fastening bolts (7, 70) pass through these through holes in order to fasten the tabs (4, 40) to one end of the hollow housing (1, 10). [5] Electric drive module according to claim 1 or 2, characterized bythat the sealing ring (5, 50) is inserted between the inner wall of the hollow housing (1, 10) and the main body of the cooling liquid sleeve (3, 22). [6] Hybrid drive system comprising an engine, characterized by that the hybrid drive system further comprises an electric drive module according to one of claims 1 to 5 and one end of the electric drive module is coupled to the engine via the clutch.

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