WO2023272714A1

WO2023272714A1 - Housing having heat dissipation function, electric motor and vehicle

Info

Publication number: WO2023272714A1
Application number: PCT/CN2021/104220
Authority: WO
Inventors: 欧阳鹏; 刘磊
Original assignee: 舍弗勒技术股份两合公司; 欧阳鹏
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2023-01-05
Also published as: CN117480712A

Abstract

A housing which has a heat dissipation function, comprising a housing body (10) and a housing cover (20), wherein the housing body (10) has an outer wall and an inner wall; a groove (11) and a plurality of spacers (12) are formed inside the housing body (10); an inlet (K1) and an outlet (K2) communicating with the outside are formed in the groove (11), so that a cooling liquid may enter the groove (11) from the inlet (K1) and leave the groove (11) from the outlet (K2); in a first direction, an at least partially closed groove bottom (11d) is formed at at least one end part of the groove (11), and an opening (11k) is formed at the other end opposite to the groove bottom (11d); the opening (11k) is closed by the housing cover (20); the plurality of spacers (12) divide the groove (11) into a plurality of unit grooves (110); at least one unit groove (110) is internally provided with a flow guide strip (13) inserted through the opening (11k); the flow guide strip (13) does not touch the groove bottom (11d); and the flow guide strip (13) may change the flow direction of the cooling liquid. The present application also provides an electric motor and a vehicle.

Description

Housing, motor and vehicle with cooling function

technical field

The invention relates to the field of heat dissipation devices, and in particular to a housing with heat dissipation function, a motor and a vehicle including the housing.

Background technique

Taking the motor of an electric vehicle as an example, in order to dissipate heat for the motor, a possible solution is to set the housing of the motor to include an inner shell and an outer shell nested with each other, and a gap through which cooling fluid can flow is formed between the inner shell and the outer shell. cooling channel. The inner shell and the outer shell are usually connected by bolts at one axial end of the shell, and sealing rings are provided at both axial ends of the shell.

The above-mentioned way of connecting at one end makes the shell form a structure similar to a cantilever, which makes the shell prone to more NVH (noise, vibration and harshness) problems. In order to alleviate the aforementioned NVH problem, it is usually necessary to install a noise reduction device on the housing, which makes the housing complex in structure, takes up a large space and is expensive.

In addition, since the inner shell and the outer shell are assembled together after processing separately, this requires the two to have high matching precision on the mating surface. Usually, the outer peripheral wall of the inner shell needs to be processed twice to improve its machining accuracy, which not only The processing cost is increased, and the debris of machining is not easy to clean up, so that the cleanliness of the shell is reduced.

Contents of the invention

The object of the present invention is to overcome or at least alleviate the shortcomings of the above-mentioned prior art, and provide a housing, a motor and a vehicle with a heat dissipation function.

According to a first aspect of the present invention, there is provided a housing with a heat dissipation function, which includes a housing body and a housing cover, the housing body has an outer wall and an inner wall, and the housing body is formed with two ends in a first direction Department, of which,

The inside of the shell body is formed with a groove between the outer wall and the inner wall and a plurality of spacers, the plurality of spacers are arranged at intervals in the second direction, and the grooves are formed to communicate with the outside world. an inlet and an outlet such that cooling liquid can enter the tank from the inlet and leave the tank from the outlet,

In said first direction, said groove forms an at least partially closed groove bottom at least at one end and an opening at the other end opposite said groove bottom, said opening being closed by said housing cover,

The plurality of spacers divide the groove into a plurality of unit grooves, at least one of the unit grooves is provided with a guide bar inserted through the opening, and the guide bar does not touch the bottom of the groove, the The guide strip can change the flow direction of the cooling liquid.

In at least one embodiment, one end of the guide strip close to the opening abuts against the case cover.

In at least one embodiment, the plurality of spacers comprises a plurality of short spacers and at least one long spacer,

the long spacer forms a closed boundary of the slot,

The short spacer is closedly connected with the bottom of the tank, and there is a gap between the opening and the cover to communicate with the adjacent unit tanks.

In at least one embodiment, the groove forms a completely closed groove bottom at one end.

In at least one embodiment, the shell body is cylindrical, and the number of the long spacers is one,

The second direction is the circumferential direction of the shell body, and in the second direction, the inlet and the outlet are respectively located on two sides of the long spacer.

In at least one embodiment, the shell body does not form a ring shape, there are two long spacers, and in the second direction, the two long spacers are respectively located at both ends of the groove,

The inlet is adjacent to one of the two long partitions, and the outlet is adjacent to the other of the two long partitions.

In at least one embodiment, a connecting portion that fits with the guide bar is formed in the groove, and the connecting portion extends along the first direction.

In at least one embodiment, the connecting portion comprises grooves formed in two opposite inner walls of the groove,

On a cross section perpendicular to the first direction, the flow guiding strip is cross-shaped and includes two fitting parts and two sealing parts,

The matching portion extends into the groove, and the sealing portion is attached to two opposite inner walls of the groove.

In at least one embodiment, at least one of the two opposing walls of the groove is formed as an uneven surface.

In at least one embodiment, one of the two opposite inner walls of the groove partially protrudes toward the other to form a plurality of raised lines, the raised lines extending along the first direction.

In at least one embodiment, a seal is provided between the housing body and the housing cover.

In at least one embodiment, the plurality of spacers are integrally formed with the inner wall and the outer wall of the shell body.

In at least one embodiment, the shell is formed by metal casting.

According to a second aspect of the present invention, there is provided an electric motor comprising the housing according to the first aspect of the present invention.

According to a third aspect of the present invention, there is provided a vehicle, characterized by comprising the electric motor according to the second aspect of the present invention.

The shell with heat dissipation function according to the present invention has simple structure, good heat dissipation effect and less problems in NVH. The electric machine and the vehicle according to the invention have the same advantages.

Description of drawings

Fig. 1 is a schematic diagram of a partial structure of a casing according to a first embodiment of the present invention (outer walls of the casing are not shown).

Fig. 2 is a cross-sectional view of a partial structure of a casing applied to a motor according to the first embodiment of the present invention.

3 and 4 are enlarged schematic views of a partial structure of a housing according to a first embodiment of the present invention.

Fig. 5 is a schematic diagram of a flow guide strip of a casing according to a first embodiment of the present invention.

Fig. 6 is an installation schematic view of another possible structure of the guide bar according to the first embodiment of the present invention.

7 is a cross-sectional view of a partial structure of a housing according to a second embodiment of the present invention.

8 is a cross-sectional view of a partial structure of a housing according to a third embodiment of the present invention.

Explanation of reference signs:

K1 entrance; K2 exit;

10 shell body; 10a first end; 10b second end; 10j connection part;

11 groove; 110 unit groove; 111 first connecting area; 112 second connecting area; 11k opening; 11d groove bottom;

12 spacers; 121 short spacers; 122 long spacers;

13 guide bar; 131 matching part; 132 sealing part;

14 protruding strips; 20 shell cover; 31 outer sealing ring; 32 inner sealing ring.

detailed description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, but are not intended to exhaust all possible ways of the present invention, nor are they intended to limit the scope of the present invention.

Unless otherwise specified, with reference to Figures 1 and 2, A represents the axial direction of the housing (in the case of a cylindrical housing), also known as the first direction of the housing; C represents the circumferential direction of the housing (in the case of the housing In the case of a cylindrical shape), it is also called the second direction of the casing; R represents the radial direction of the casing (in the case of a cylindrical casing).

(first embodiment)

Firstly, taking the housing of the motor as an example, referring to FIG. 1 to FIG. 6 , the housing with heat dissipation function according to the first embodiment of the present invention is introduced.

Referring to FIG. 1 and FIG. 2 , the housing includes a housing body 10 and a housing cover 20 . In the axial direction A, the casing body 10 has a first end 10 a and a second end 10 b, and the casing cover 20 is disposed on the first end 10 a of the casing body 10 .

Referring to Fig. 3 and Fig. 4 at the same time, the interior of the shell body 10 (between the outer wall and the inner wall of the shell body 10, also called between the outer surface and the inner surface of the shell body 10) is formed with a substantially annular shape (also can be considered as There is an annular notch, and the long spacer 122 described below forms the groove 11 of the annular notch). Groove 11 is used for cooling liquid to flow.

In the axial direction A, the groove 11 is closed at the second end 10b, that is, the housing body 10 forms a closed groove bottom 11d at the second end 10b, and forms an opening 11k at the first end 10a. The groove bottom 11d connects the inner wall and the outer wall. The case cover 20 disposed at the first end 10a functions to close the opening 11k.

The housing body 10 is also formed with an inlet K1 and an outlet K2 for communicating the tank 11 with the outside world. Cooling liquid can flow into the tank 11 from the inlet K1 and flow out of the tank 11 through the outlet K2. Optionally, both the inlet K1 and the outlet K2 are disposed on the peripheral wall (or outer wall) of the housing body 10 . It should be understood that in FIG. 1 , for the convenience of illustration, the outer peripheral wall of the housing body 10 is omitted, but the inlet K1 and the outlet K2 are retained.

Between the housing body 10 and the housing cover 20, an outer sealing ring 31 and an inner sealing ring 32 are respectively provided on the outer peripheral side and the inner peripheral side of the groove 11 to prevent leakage of cooling liquid from the vicinity of the opening 11k. Here, the outer sealing ring 31 may be a radial sealing ring, and the inner sealing ring 32 may be a radial sealing ring.

A plurality of spacers 12 arranged in the circumferential direction C and extending in the axial direction A are also formed inside the housing body 10 . The plurality of spacers 12 includes a plurality of short spacers 121 and one long spacer 122 . In the circumferential direction C, a unit groove 110 is formed between adjacent spacers 12 .

The short spacer 121 partially separates two adjacent unit slots 110 , and the long spacer 122 completely separates two adjacent unit slots 110 . In other words, in the axial direction A, the short spacers 121 partially fill the slots 11 , and the long spacers 122 completely fill the slots 11 . It can be understood that the spacer 12 can be, but not limited to, integrally formed with the outer wall and the inner wall of the housing body 10 .

In the axial direction A, the short spacers 121 extend from the second end 10b to close to the first end 10a, leaving a first communication area 111 in the groove 11 close to the first end 10a, so that the adjacent unit grooves 110 They are completely blocked near the second end 10b and communicate with each other only in the first communication area 111 .

The long spacers 122 completely block the adjacent unit slots 110 , and the cooling liquid cannot pass over the long spacers 122 and flow between two adjacent unit slots 110 .

The inlet K1 and the outlet K2 can be respectively located in the two unit tanks 110 adjacent to the long spacer 122 , or in other words, the inlet K1 and the outlet K2 are respectively located on both sides of the long spacer 122 in the circumferential direction and arranged close to the long spacer 122 .

It should be understood that the above-mentioned "long spacer 122 completely blocks the adjacent unit grooves 110" is only used to illustrate that the two unit grooves 110 on both sides of the long spacer 122 cannot communicate directly. A substantially annular shape is formed in the circumferential direction C, and the two unit grooves 110 separated by short spacers 121 can still communicate in the first communication area 111, so the above-mentioned two unit grooves 110 separated by long spacers 122 actually pass through multiple The first connecting area 111 is indirectly connected.

It should be understood that although the spacer 12 (short spacer 121 or long spacer 122) is used above to fill the groove 11, the formation process of the shell body 10 is not necessarily to form the groove 11 first, and then fill the groove 11. Inner filling spacer 12.

For example, the shell body 10 may be formed by casting, and the slots 11 and spacers 12 are simultaneously formed after demoulding. Since both the opening 11k and the first communicating area 111 are located at the first end 10a, this facilitates the design of the casting mold.

As another example, the groove 11 may be formed by removing material through machining (eg milling). Since both the opening 11k and the first communication area 111 are located at the first end 10a, it is convenient for the tool to penetrate into the inside of the housing body 10 and process the groove 11.

It should be understood that, in addition to separating the flow path of the cooling liquid, the spacer 12 also plays a role of enhancing the structural strength of the shell body 10 .

Each unit slot 110 is inserted with a guide bar 13 . The flow guide bar 13 is in the shape of a long strip, which connects with the shell cover 20 at the first end 10a and divides the unit slot 110 into two spaced apart parts (hereinafter also referred to as half slots); the flow guide bar 13 does not completely extend to the second The two ends 10 b leave a second communication area 112 near the second end 10 b in the groove 11 , and the above two half grooves can communicate with each other through the second communication area 112 .

The setting of the guide bar 13 enables the cooling liquid flowing into each unit groove 110 to change its flow direction in the groove 110, so that the cooling liquid can flow from the first end 10a to the second end 10b in each unit groove 110, and The flow direction is changed at the second communication area 112 and then flows from the second end 10b to the first end 10a.

Furthermore, since the first communication area 111 and the second communication area 112 are respectively located at the axial ends of the same half groove, the first communication area 111 also plays a role in changing the flow direction of the cooling liquid.

Therefore, for the whole tank 11, the cooling liquid is partly spaced in the tank 11 by the short spacers 121 and the guide bars 13, so that the cooling liquid alternately flows through the first communication area 111 and the second communication area 112 and alternately changes in The direction of flow on axis A. Overall, the cooling liquid flows through the slot 11 in a continuous S-shape, which enables the cooling liquid to flow evenly through the shell body 10 to achieve a good cooling effect.

Referring to FIG. 4 , a groove-shaped connecting portion 10j for positioning the flow guide bar 13 may be formed in the unit groove 110 .

Referring to FIG. 5 , the cross-section of the guide bar 13 perpendicular to the axial direction A may be substantially cross-shaped (or fork-shaped). The cross-shaped structure includes two fitting parts 131 arranged away from each other and two sealing parts 132 arranged away from each other. The outer contour of the matching portion 131 is adapted to the outer contour of the connecting portion 10j, so that the guide bar 13 is just positioned on the connecting portion 10j. The sealing part 132 is embedded in the groove 11, and in the radial direction R, the wall of the sealing part 132 is attached to the wall of the groove 11, which strengthens the tightness of the guide bar 13 for blocking the adjacent half groove.

It should be understood that the cross-sectional shapes of the flow guide bar 13 and the connecting portion 10j may be varied. For example, the cross section of the flow guide bar 13 may be substantially rectangular without the sealing portion 132 . For another example, referring to FIG. 6 , the connecting portion 10j may also be formed as a convex portion in the cell groove 110 , and the guide bar 13 is formed as a concave portion matching the protruding connecting portion 10j.

Optionally, a convex strip 14 is also formed in the half groove. The convex strip 14 is formed as a protrusion protruding radially inward or radially outward from the two opposite inner walls of the groove 11 in the radial direction R, and in the radial direction R, the convex strip 14 does not connect the two opposite inner walls , that is, the ribs 14 do not space the half grooves in the circumferential direction C. Preferably, at least part of the raised lines 14 are formed on the inner wall, and the raised lines 14 are mainly used to increase the area of the inner wall of the groove 11 and increase the heat dissipation effect of the housing body 10 .

The present application does not limit the length of the convex line 14 in the axial direction A. Optionally, in order to facilitate the uniform flow of the cooling liquid in the groove 11 (especially when the cooling liquid turns around passing through the first communication area 111 ), the protruding strip 14 does not extend to the first end 10a. Optionally, in order to facilitate the processing and shaping of the raised line 14 , the raised line 14 extends to the second end 10 b of the shell body 10 .

(second embodiment)

Next, a second embodiment according to the present invention will be described with reference to FIG. 7 . The second embodiment is a modification of the first embodiment, and components having the same or similar structures or functions as those in the first embodiment are given the same reference numerals, and detailed descriptions of these components are omitted.

In this embodiment, the case body 10 is formed not in a cylindrical shape but in a substantially flat plate shape. The casing body 10 is suitable for a casing surrounded by a plurality of independent flat plates, for example, or may belong to a certain part in the casing. In addition, the casing body 10 in this embodiment may also be curved, for example, it is formed in a semi-cylindrical shape with an arc-shaped cross section.

For the convenience of expression, the two side walls of the shell body 10 are respectively called the outer wall and the inner wall. A groove 11 is formed between the outer wall and the inner wall.

This embodiment is equivalent to expanding the case body 10 in the first embodiment in the circumferential direction C (referred to as the second direction in this embodiment).

The main difference between this embodiment and the first embodiment is that it includes two long spacers 122 which form the boundary of the plate-shaped shell body 10 in the second direction. The inlet K1 and the outlet K2 are respectively located at two ends in the second direction.

Only one sealing ring may be provided, that is, an outer sealing ring 31 is provided between the housing body 10 and the housing cover 20 and on the periphery of the groove 11 .

(third embodiment)

A third embodiment according to the present invention will be described below with reference to FIG. 8 . The third embodiment is a modification of the second embodiment, and components having the same or similar structure or function as those in the second embodiment are given the same reference numerals, and detailed descriptions of these components are omitted.

In this embodiment, openings 11 k are formed at both ends of the housing body 10 in the first direction, and each opening 11 k is covered with a housing cover 20 . Since each end has both an opening 11k and a groove bottom 11d, it is also said that the end of the groove 11 in an axial direction forms a partially closed groove bottom 11d, and the opposite side of the groove bottom 11d forms an opening 11k.

The inlet K1 and the outlet K2 are respectively located at two ends in the first direction.

For the two short spacers 121 at the junction of the openings 11k in different orientations as shown in Figure 8, the two short spacers 121 respectively form a first communication area 111 at the two ends. There may be no guide bar 13 between 121. Of course, in this case, two flow guide bars 13 may also be arranged between the two short spacers 121 .

It should be understood that the above-mentioned embodiments and some aspects or features thereof may be properly combined.

Part of the beneficial effects of the above-mentioned embodiments of the present invention will be briefly described below.

(i) The casing according to the present invention has a simple structure and high reliability, and avoids forming the casing into a cantilever structure.

(ii) By changing the structure of the case, the natural frequency of the case is adjusted, making the case less problematic in terms of NVH.

(iii) Due to the good NVH characteristics of the casing, it is not necessary to arrange an additional sound-absorbing device outside the casing, which reduces the cost.

(iv) The spacers 12 in the housing body 10 not only serve to limit the flow direction of the coolant, but also enhance the structural strength of the housing.

(v) Since the main body of the shell body 10 is an integral piece, the groove 11 is not formed by assembling separate inner shells and outer shells, so there is no need to perform secondary processing on the shell to improve its machining accuracy.

It should be understood that the above-mentioned embodiments are only exemplary, and are not intended to limit the present invention. Those skilled in the art can make various modifications and changes to the above embodiments under the teaching of the present invention without departing from the scope of the present invention. E.g,

(i) Although the spacer 12 is preferably integrated with the inner wall and the outer wall of the housing body 10, so as to improve the degree of integration of the housing body 10 and reduce the vibration of the housing body 10 during operation. However, in other possible implementations, at least part of the spacer bar 12 may also be formed as an insertion structure similar to the flow guide bar 13 .

(ii) Although the flow guide bar 13 is preferably formed into a tight fit with the shell body 10, to enhance the sealing degree between the flow guide bar 13 and the wall of the shell body 10, and to reduce the gap between the assembly parts of the shell during operation. generated vibration. However, the present application does not limit the matching relationship between the flow guide bar 13 and the connecting portion 10j (or the degree of sealing between the flow guide bar 13 and the wall of the groove 11), because even if the flow guide bar 13 and the groove 11 The wall does not form a seal at the connection portion 10j, and the flow guide bar 13 still has a flow guide function.

(iii) In addition to being used as a housing for a motor, the housing according to the present application can also be used as a housing for other devices.

Claims

A housing with heat dissipation function, comprising a housing body (10) and a housing cover (20), the housing body (10) has an outer wall and an inner wall, and the housing body (10) is formed in a first direction two ends, characterized in that,

The inside of the shell (10) is formed with a groove (11) between the outer wall and the inner wall and a plurality of spacers (12), and the plurality of spacers (12) are spaced apart in the second direction Arranged openly, the groove (11) is formed with an inlet (K1) and an outlet (K2) communicating with the outside world, so that the cooling liquid can enter the groove (11) from the inlet (K1) and flow from the outlet ( K2) leaves the trough (11),

In the first direction, the groove (11) forms an at least partially closed groove bottom (11d) at least at one end and an opening (11k) at the other end opposite to the groove bottom (11d) ), the opening (11k) is closed by the shell cover (20),

The plurality of spacers (12) divide the groove (11) into a plurality of unit grooves (110), at least one of the unit grooves (110) is provided with a guide bar inserted through the opening (11k) (13), the guide bar (13) does not contact the groove bottom (11d), and the guide bar (13) can change the flow direction of the cooling liquid.
The casing according to claim 1, characterized in that, one end of the guide bar (13) close to the opening (11k) abuts against the casing cover (20).
The housing according to claim 1, wherein the plurality of spacers (12) comprise a plurality of short spacers (121) and at least one long spacer (122),

said long spacer (122) forms a closed boundary of said groove (11),

The short spacers (121) are hermetically connected to the tank bottom (11d), and there is a gap between the opening (11k) and the shell cover (20) so that the adjacent units The slots (110) communicate.
The housing according to any one of claims 1 to 3, characterized in that the groove (11) forms a completely closed groove bottom (11d) at one end.
The housing according to claim 3, characterized in that, the housing body (10) is cylindrical, and the number of the long spacers (122) is one,

The second direction is the circumferential direction of the shell body (10), and in the second direction, the inlet (K1) and the outlet (K2) are respectively located on two sides of the long spacer (122). side.
The shell according to claim 3, characterized in that, the shell body (10) does not form a ring shape, there are two long spacers (122), and in the second direction, two of the long spacers Spacers (122) are respectively located at both ends of the groove (11),

The inlet (K1) is next to one of the two long partitions (122), and the outlet (K2) is next to the other of the two long partitions (122).
The casing according to any one of claims 1 to 6, characterized in that, a connecting portion (10j) that is fitted with the guide bar (13) is formed in the groove (11), and the The connecting portion (10j) extends along the first direction.
The casing according to claim 7, characterized in that, the connecting portion (10j) comprises grooves formed on two opposite inner walls of the groove (11),

On a cross section perpendicular to the first direction, the flow guide strip (13) is cross-shaped and includes two fitting parts (131) and two sealing parts (132),

The matching part (131) extends into the groove, and the sealing part (132) is attached to two opposite inner walls of the groove (11).
Housing according to any one of claims 1 to 8, characterized in that at least one of the two opposing walls of the groove (11) is formed as an uneven surface.
The casing according to claim 9, characterized in that, one of the two opposite inner walls of the groove (11) partially protrudes toward the other to form a plurality of convex lines (14), the The convex strip (14) extends along the first direction.
The casing according to any one of claims 1 to 9, characterized in that a seal is provided between the casing body (10) and the casing cover (20).
The casing according to any one of claims 1 to 11, characterized in that, the plurality of spacers (12) are integrally formed with the inner wall and the outer wall of the casing body (10).
The housing according to any one of claims 1 to 12, characterized in that the housing body (10) is formed by metal casting.
A motor, characterized by comprising the casing according to any one of claims 1-13.
A vehicle, characterized by comprising the motor according to claim 14.