Integrated motor shell and motor

Abstract

The utility model provides an integrated motor shell and a motor, the integrated motor shell comprises a motor shell (1) and a cooling sleeve (2), the cooling sleeve (2) is arranged on the radial inner side of the motor shell (1), the cooling sleeve (2) and the motor shell (1) are connected together through induction welding by using at least two welding rings (4), and before induction welding, the cooling sleeve (2) is welded to the motor shell (1) through the welding rings (4). A gap is formed between the motor shell (1) and the cooling sleeve (2), the welding rings (4) are located at the two axial ends of the cooling sleeve (2), and after induction welding, the welding rings (4) are melted and fill the gap between the motor shell (1) and the cooling sleeve (2), so that the motor shell (1) and the cooling sleeve (2) are connected together in a fused mode. Therefore, a gap between the cooling sleeve (2) and the motor housing (1) is sealed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and particularly relates to an integrated electric machine shell and electric machine. BACKGROUND

[0002] As shown in Figure 1 and Figure 2 , in one possible technical solution, the electric machine comprises an electric machine shell 1, a cooling jacket 2 and two O-rings 3 (sealing rings).

[0003] When assembling the electric machine, the cooling jacket 2 needs to be first heated and connected with the electric machine stator in an interference fit, and the deformation generated after heating is corrected through secondary machining to make the size of the cooling jacket 2 accurate. The O-rings 3 are respectively assembled on the two axial sides of the outer periphery of the cooling jacket 2, and then the cooling jacket 2 and the electric machine shell 1 are assembled together, and the cooling jacket 2 and the electric machine shell 1 are fixed by using bolts.

[0004] The structure and assembly method of the above electric machine have the following problems.

[0005] (1) Since the size of the outer periphery of the cooling jacket 2 changes after heating, secondary machining is needed to ensure the installation accuracy, which leads to a complex assembly process of the electric machine.

[0006] (2) Since secondary machining is needed, the wall thickness of the groove region of the cooling jacket 2 where the O-rings 3 are installed is thick, and the torque generated by the rotation of the electric machine rotor relative to the electric machine stator is transmitted to the cooling jacket 2. When the radial load is high, the O-rings 3 have a risk of leakage. CONTENT OF THE INVENTION

[0007] The present application is made in view of the above state of the art. The purpose of the present application is to provide an integrated electric machine shell.

[0008] The present application provides an integrated electric machine shell, which comprises an electric machine shell and a cooling jacket, wherein,

[0009] The cooling jacket is arranged on the radial inner side of the electric machine shell, and the cooling jacket and the electric machine shell are connected together by induction welding using at least two welding rings,

[0010] Before induction welding, there is a gap between the electric machine shell and the cooling jacket, and the welding rings are located at the axial two end positions of the cooling jacket,

[0011] After induction welding, the welding rings melt and fill the gap between the electric machine shell and the cooling jacket, so that the electric machine shell and the cooling jacket are connected together in a fusion manner, thereby sealing the gap between the cooling jacket and the electric machine shell.

[0012] In at least one possible implementation, the motor housing is provided with an opening for loading the cooling jacket and the welding ring into the interior of the motor housing, the opening is located at one axial end of the motor housing, the motor housing is provided with a positioning portion, the positioning portion is located at the other axial side of the cooling jacket, and the positioning portion can axially position the welding ring and the cooling jacket.

[0013] In at least one possible implementation, before induction welding, at least one of the welding rings is located between the positioning portion and the cooling jacket in the axial direction of the integrated motor housing.

[0014] In at least one possible implementation, before induction welding, at least one of the welding rings is located at the axial end of the cooling jacket in the axial direction of the integrated motor housing at one axial end of the motor housing.

[0015] In at least one possible implementation, there is no sealing ring between the cooling jacket and the motor housing.

[0016] In at least one possible implementation, neither the outer circumferential surface of the cooling jacket nor the inner circumferential surface of the motor housing is provided with a groove for accommodating the welding ring.

[0017] In at least one possible implementation, the welding ring is made of an aluminum alloy material.

[0018] In at least one possible implementation, the melting point of the material making the motor housing and the cooling jacket is greater than the melting point of the material making the welding ring.

[0019] The present application also proposes a motor comprising the integrated motor housing of any one of the above technical solutions.

[0020] In at least one possible implementation, the motor comprises a motor stator, the cooling jacket is wrapped radially outside the motor stator, and the cooling jacket and the motor stator are connected by interference fit.

[0021] By adopting the above technical solution, the cooling jacket and the motor housing are connected together by fusion through induction welding (i.e., the cooling jacket and the motor housing are connected together by the welding material formed by the melted welding ring), thereby sealing the gap between the cooling jacket and the motor housing, the sealing effect is good, the sealing effect is not easy to decay, the qualified rate is relatively high, the leakage risk is low, and the induction welding has less effect on the structure and size of the cooling jacket and the motor housing. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A partial structural schematic diagram of a motor showing one possible technical solution is shown.

[0023] Figure 2 a partial enlarged view of Figure 1

[0024] Figure 3 a partial structural schematic view of an electric machine according to an embodiment of the present application is shown.

[0025] Figure 4 a partial enlarged view of Figure 3

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1 electric machine housing 11 positioning portion 12 opening

[0028] 2 cooling jacket 21 protruding rib

[0029] 4 welding ring

[0030] A axial R radial DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. It is to be understood that the specific description is only for the purpose of teaching one skilled in the art how to implement the present application, and is not intended to limit the scope of the present application in any way.

[0032] The present application proposes an electric machine, which comprises an integrated electric machine housing, an electric machine stator and an electric machine rotor. The electric machine stator and the electric machine rotor are both arranged inside the integrated electric machine housing, the electric machine stator can be connected to the integrated electric machine housing, and the electric machine rotor is arranged at the radially inner side of the electric machine stator in a rotatable manner relative to the electric machine stator.

[0033] As shown in Figure 3 and Figure 4 , the integrated electric machine housing comprises an electric machine housing 1 and a cooling jacket 2, the cooling jacket 2 is arranged inside the electric machine housing 1, and the axial one end (the upper end in Figure 3 , the left end in Figure 4 ) of the electric machine housing 1 can be provided with an opening 12, the cooling jacket 2 can be loaded into the electric machine housing 1 from the opening 12, i.e. the cooling jacket 2 can be arranged at the inner side of the electric machine housing 1 in the radial direction R. It can be understood that the opening 12 can be closed by an end cover of the electric machine.

[0034] The cooling jacket 2 can be in a cylindrical shape, the cooling jacket 2 can surround the electric machine stator in the radial direction, and the cooling jacket 2 and the electric machine stator can be connected through an interference fit. The outer circumferential surface of the cooling jacket 2 can be provided with a protruding rib 21, the protruding rib 21 can extend along the circumferential direction of the cooling jacket 2 (including extending substantially along the circumferential direction of the cooling jacket 2), and a flow channel can be defined between the electric machine housing 1 and the cooling jacket 2 through the protruding rib 21, the flow channel can be used for the circulation of a cooling medium.

[0035] ​​The cooling jacket 2 and the motor housing 1 can be joined together using at least two welding rings 4 by means of welding, for example, induction welding.

[0036] Before induction welding, there is a gap between the motor housing 1 and the cooling jacket 2, and the welding ring 4 is located at both ends on the axial direction A of the cooling jacket 2.

[0037] During induction welding, welding rings 4 are respectively set at both ends of the cooling sleeve 2 along the axial direction A. The welding rings 4 can be rotating bodies with a circular cross-section. The welding rings 4 can be located at the gap between the motor housing 1 and the cooling sleeve 2. After the welding rings 4 melt, the molten material can fill the gap between the motor housing 1 and the cooling sleeve 2.

[0038] Specifically, at the other axial end of the motor housing 1 (the end furthest from the opening of the motor housing 1), Figure 3 The lower end of the middle Figure 4 The right end of the cooling jacket 2 may be provided with a positioning part 11, which can protrude from the inner wall of the motor housing 1. The positioning part 11 is located on the other side of the axial direction of the cooling jacket 2 (the end away from the opening of the motor housing 1). Figure 3 The lower end of the middle Figure 4 (Right end of the middle). The positioning part 11 can axially position the welding ring 4 and the cooling sleeve 2. Before induction welding, after the cooling sleeve 2 and the welding ring 4 are installed into the motor housing 1, the welding ring 4 can be located between the positioning part 11 and the cooling sleeve 2 in the axial direction A.

[0039] At one axial end of the motor housing 1 ( Figure 3 The upper part of the middle Figure 4 (At the left end of the middle), the motor housing 1 and the cooling jacket 2 may have a gap, and the welding ring 4 may be placed in the gap or placed on the gap.

[0040] The groove for accommodating the welding ring 4 may not be provided on the outer circumferential surface of the cooling jacket 2 or the inner circumferential surface of the motor housing 1. Before induction welding, the welding ring 4 does not need to be positioned by the groove; it can simply be placed on the cooling jacket 2 or the motor housing 1.

[0041] During induction welding, the welding ring 4 melts and fills the gap between the cooling sleeve 2 and the motor housing 1. After the material of the welding ring 4 re-solidifies, the cooling sleeve 2 and the motor housing 1 are fused together by welding (i.e., the cooling sleeve 2 and the motor housing 1 are connected by the weld material formed by the melted welding ring), meaning that the cooling sleeve 2 and the motor housing 1 cannot be separated by non-destructive means. The space between the cooling sleeve 2 and the motor housing 1 is sealed at both axial ends of the integrated motor housing. The sealing effect after welding the motor housing 1 and the cooling sleeve 2 is equivalent to the quality of integral casting. The integrated motor housing has a long service life, high sealing reliability, and does not suffer from the performance impact of rubber aging of the O-rings used for sealing.

[0042] Further, the welding ring 4 can be made of a material with a low melting point, such as an aluminum alloy. The welding ring 4 melts rapidly and fills the gap between the motor housing 1 and the cooling jacket 2 when heated to a certain temperature.

[0043] The melting point of the material used to make the motor housing 1 and the cooling jacket 2 is higher than the melting point of the material used to make the welding ring 4. When induction welding is performed, the welding ring 4 can be melted, while the components being welded (i.e., the motor housing 1 and the cooling jacket 2) are not melted. For example, the motor housing 1 and the cooling jacket 2 can be made of an aluminum alloy or a magnesium alloy. Induction welding has no effect on the structure or size of the motor housing 1 and the cooling jacket 2, and the weld is located in the gap between the motor housing 1 and the cooling jacket 2, which does not affect the appearance, so no machining is required after induction welding.

[0044] The following describes some installation steps of the motor.

[0045] First, the cooling jacket 2 is heated and connected to the motor stator with an interference fit. Since the motor housing 1 and the cooling jacket do not need to be precisely sized, the cooling jacket 2 is allowed to change in size after being heated, as long as it can be fitted into the interior of the motor housing 1.

[0046] A welding ring 4 is placed in the motor housing 1, with the welding ring 4 located at the other axial end of the cooling jacket 2, and induction welding is used to fix the cooling jacket 2 and the motor housing 1 at the other axial end of the cooling jacket 2.

[0047] Another welding ring 4 is placed at the axial end of the cooling jacket 2, and induction welding is used to fix the cooling jacket 2 and the motor housing 1 at the axial end of the cooling jacket 2.

[0048] It can be understood that the two welding rings 4 can be welded sequentially or simultaneously.

[0049] The integrated motor housing and motor of the present application has the following beneficial effects.

[0050] (1) Using induction welding can make the cooling jacket 2 and the motor housing 1 be connected together in a fused manner, with good sealing effect, which is not easily attenuated, has a high pass rate, has a low risk of leakage, and has a small effect of induction welding on the structure and size of the cooling jacket and the motor housing.

[0051] (2) Compared with the technical solution in the background art, the cooling jacket 2 and the motor housing 1 of the present application do not have a sealing ring (here, especially a traditional rubber sealing ring), and the assembly process of the O-ring is omitted, so the production cost is low.

[0052] (3) There is no need to correct the deformation of the cooling jacket 2 after heating through secondary machining, which saves the clamps and time cost of secondary machining, and makes the production cost low.

[0053] (4) The inner circumferential surface of the motor housing 1 or the outer circumferential surface of the cooling jacket 2 does not need to be machined for accommodating the welding ring 4, so the machining cost of the motor housing or the cooling jacket is lower.

[0054] It should be understood that at least part of the aspects or features of the above-mentioned embodiments, examples or examples can be appropriately combined.

[0055] It can be understood that in the present application, when the number of components or members is not particularly limited, the number can be one or more, and here the plurality refers to two or more. For the case where the number of components or members is described as, for example, two, three, four, etc. specific number in the drawings and / or the description, the specific number is generally exemplary and not limited, which can be understood as a plurality, that is, two or more, but this does not mean that the present application excludes the case of one.

[0056] It should be understood that the above-mentioned embodiments, examples or examples are only exemplary and are not used to limit the present application. Those skilled in the art can make various modifications and changes to the above-mentioned embodiments, examples or examples under the teaching of the present application, without departing from the scope of the present application.

[0057] The cooling jacket and the motor housing can be connected together by induction welding using two or more welding rings, for example, the cooling jacket and the motor housing are welded together by two welding rings at each axial end of the cooling jacket.

Claims

1. An integrated motor housing, characterized by, The integrated motor housing comprises a motor shell and a cooling jacket, wherein, The cooling jacket is arranged at the radial inner side of the motor shell, and the cooling jacket and the motor shell are connected together by induction welding using at least two welding rings, Before induction welding, there is a gap between the motor shell and the cooling jacket, and the welding rings are located at the axial two ends of the cooling jacket, After induction welding, the welding rings melt and fill the gap between the motor shell and the cooling jacket, so that the motor shell and the cooling jacket are connected together in a fusion manner, thereby sealing the gap between the cooling jacket and the motor shell.

2. The integrated motor housing of claim 1, wherein, The motor shell is provided with an opening for loading the cooling jacket and the welding ring into the inside of the motor shell, the opening is located at one axial end of the motor shell, the motor shell is provided with a positioning part located at the axial other side of the cooling jacket, and the positioning part can axially position the welding ring and the cooling jacket.

3. The integrated motor housing of claim 2, wherein, Before induction welding, at least one of the welding rings is located between the positioning part and the cooling jacket in the axial direction of the integrated motor housing.

4. The integrated motor housing of claim 1, wherein, At one axial end of the motor shell, before induction welding, at least one of the welding rings is located at the axial end of the cooling jacket in the axial direction of the integrated motor housing.

5. The integrated motor housing of claim 1, wherein, There is no sealing ring between the cooling jacket and the motor shell.

6. The integrated motor housing of claim 1, wherein, There is no groove on the outer circumferential surface of the cooling jacket and the inner circumferential surface of the motor shell to accommodate the welding ring.

7. The integrated motor housing of claim 1, wherein, The welding ring is made of aluminum alloy material.

8. The integrated motor housing of claim 1, wherein, The melting point of the material making the motor shell and the cooling jacket is greater than the melting point of the material making the welding ring.

9. An electric machine characterized by The integrated motor housing of any one of claims 1 to 8.

10. The electric machine of claim 9, wherein, The motor comprises a motor stator, the cooling jacket surrounds the radial outer side of the motor stator, and the cooling jacket and the motor stator are connected by interference fit.

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