CN117480712A

CN117480712A - Shell with heat dissipation function, motor and vehicle

Info

Publication number: CN117480712A
Application number: CN202180099400.0A
Authority: CN
Inventors: 欧阳鹏; 刘磊
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2024-01-30
Also published as: WO2023272714A1

Abstract

A shell with a heat dissipation function comprises a shell body (10) and a shell cover (20), wherein the shell body (10) is provided with an outer wall and an inner wall, a groove (11) and a plurality of division bars (12) are formed in the shell body (10), an inlet (K1) and an outlet (K2) which are communicated with the outside are formed in the groove (11), cooling liquid can enter the groove (11) from the inlet (K1) and leave the groove (11) from the outlet (K2), at least one end part of the groove (11) forms an at least partially closed groove bottom (11 d) in a first direction, an opening (11K) is formed in the other end part opposite to the groove bottom (11 d), the opening (11K) is closed by the shell cover (20), the division bars (12) divide the groove (11) into a plurality of unit grooves (110), a diversion bar (13) which is inserted through the opening (11K) is arranged in at least one unit groove (110), the diversion bar (13) does not contact the groove bottom (11 d), and the diversion bar (13) can change the flow direction of the cooling liquid. The application also provides a motor and a vehicle.

Description

Shell with heat dissipation function, motor and vehicle

Technical Field

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

Background

Taking an electric motor of an electric vehicle as an example, in order to radiate heat from the electric motor, one possible solution is to arrange the housing of the electric motor to comprise an inner housing and an outer housing nested in each other, between which cooling channels are formed, through which cooling fluid can flow. The inner and outer shells are typically bolted together at one axial end of the shell, with both axial ends of the shell being provided with sealing rings.

The above-described manner of connection at one end results in the housing forming a cantilever-like structure, which makes the housing susceptible to more NVH (noise, vibration and harshness) issues. To alleviate the above-mentioned NVH problem, it is also generally necessary to provide a muffler device in the housing, which makes the housing complex in structure, large in occupied space and high in cost.

In addition, because the inner shell and the outer shell are assembled together after being respectively processed, the inner shell and the outer shell are required to have higher matching precision on the matching surface, and the secondary processing is usually required to be carried out on the outer peripheral wall of the inner shell so as to improve the processing precision, so that the processing cost is increased, and the machined scraps are not easy to clean, so that the cleanliness of the shell is reduced.

Disclosure of Invention

The invention aims to overcome or at least alleviate the defects in the prior art and provide a shell, a motor and a vehicle with a heat dissipation function.

According to a first aspect of the present invention, there is provided a housing having a heat radiation function, comprising a housing body and a housing cover, the housing body having an outer wall and an inner wall, and the housing body being formed with two ends in a first direction, wherein,

the inside of the housing body is formed with a groove between the outer wall and the inner wall and a plurality of division bars arranged at intervals in a second direction, the groove is formed with an inlet and an outlet communicating with the outside so that a cooling liquid can enter the groove from the inlet and leave the groove from the outlet,

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

the grooves are divided into a plurality of unit grooves by the plurality of parting strips, at least one unit groove is internally provided with a flow guide strip inserted through the opening, the flow guide strip is not contacted with the groove bottom, and the flow guide strip can change the flow direction of the cooling liquid.

In at least one embodiment, the deflector strip abuts the housing cover at an end proximate the opening.

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

the elongated bars form the closed boundary of the slot,

the short parting strips are connected with the tank bottom in a closed mode, and gaps are reserved between the opening and the case cover so that adjacent unit tanks are communicated.

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

In at least one embodiment, the housing is cylindrical, the number of long parting strips is one,

the second direction is the circumference of the shell body, and in the second direction, the inlet and the outlet are respectively positioned at two sides of the long parting bead.

In at least one embodiment, the housing body does not form a ring shape, the number of the long parting strips is two, in the second direction, the two long parting strips are respectively positioned at two ends of the groove,

the inlet is adjacent to one of the two long bars and the outlet is adjacent to the other of the two long bars.

In at least one embodiment, a connecting portion is formed in the groove to be fitted with the guide strip, and the connecting portion extends in the first direction.

In at least one embodiment, the connection portion includes grooves formed in two opposing inner walls of the groove,

on a section perpendicular to the first direction, the flow guide strip is cross-shaped and comprises two matching parts and two sealing parts,

the matching part stretches into the groove, and the sealing part 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 opposing inner walls of the groove is partially raised toward the other to form a plurality of ribs, the ribs extending in 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 division bars are integrally formed with the inner and outer walls of the housing.

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 machine comprising a housing according to the first aspect of the present invention.

According to a third aspect of the present invention there is provided a vehicle characterised by comprising an electric machine according to the second aspect of the present invention.

The shell with the heat dissipation function is simple in structure, good in heat dissipation effect and less in NVH problem. The motor and the vehicle according to the invention have the same advantages.

Drawings

Fig. 1 is a schematic view of a part of the structure of a housing (the outer wall of the housing is not shown) according to a first embodiment of the present invention.

Fig. 2 is a sectional view of a portion of a structure of a housing applied to a motor according to a first embodiment of the present invention.

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

Fig. 5 is a schematic view of a deflector strip of a housing according to a first embodiment of the present invention.

Fig. 6 is a schematic view of the installation of a deflector strip according to another possible configuration of the first embodiment of the present invention.

Fig. 7 is a sectional view of a part of the structure of a housing according to a second embodiment of the present invention.

Fig. 8 is a sectional view of a part of the structure of a housing according to a third embodiment of the present invention.

Reference numerals illustrate:

a K1 inlet; a K2 outlet;

10 shells; 10a first end; 10b second end; 10j connection parts;

11 grooves; 110 unit slots; 111 a first communication area; 112 a second communication zone; 11k openings; 11d groove bottoms;

12 division bars; 121 short division bars; 122 long division bars;

13, a flow guiding strip; 131 mating parts; 132 sealing portion;

14 convex strips; 20 cover; 31 an outer seal ring; 32 inner seal 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 illustrations are for the purpose of illustrating how one skilled in the art may practice the invention, and are not intended to be exhaustive of all of the possible ways of practicing the invention, nor to limit the scope of the invention.

Unless otherwise specified, with reference to fig. 1 and 2, a denotes an axial direction of the housing (in the case where the housing is cylindrical), also referred to as a first direction of the housing; c represents the circumferential direction of the housing (in the case of a cylindrical housing), also referred to as the second direction of the housing; r represents the radial direction of the housing (in the case where the housing is cylindrical).

(first embodiment)

First, taking a housing of a motor as an example, a housing having a heat dissipation function according to a first embodiment of the present invention will be described with reference to fig. 1 to 6.

Referring to fig. 1 and 2, the housing includes a housing body 10 and a housing cover 20. In the axial direction a, the housing body 10 has a first end 10a and a second end 10b, and the cover 20 is provided at the first end 10a of the housing body 10.

Referring to fig. 3 and 4 together, a generally annular groove 11 (which may also be considered as an annular shape with a gap, and a long division bar 122 described below forms a gap of an annular shape) is formed in the interior of the housing 10 (between the outer wall and the inner wall of the housing 10, also referred to as between the outer surface and the inner surface of the housing 10). The tank 11 is used for flowing the cooling liquid.

In the axial direction a, the groove 11 is closed at the second end 10b, i.e. the housing body 10 is formed with a closed groove bottom 11d at the second end 10b and an opening 11k at the first end 10a. The groove bottom 11d connects the inner wall and the outer wall. The cover 20 provided at the first end 10a functions to close the opening 11k.

The housing 10 is further formed with an inlet K1 and an outlet K2 for communicating the tank 11 with the outside, and the coolant can flow into the tank 11 from the inlet K1 and flow out of the tank 11 from the outlet K2. Alternatively, the inlet K1 and the outlet K2 are provided in the outer peripheral wall (or outer wall) of the housing 10. It should be understood that the outer peripheral wall of the housing body 10 is omitted in fig. 1 for convenience of illustration, but the inlet K1 and the outlet K2 are left illustrated.

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

The interior of the housing body 10 is also formed with a plurality of division bars 12 arranged in the circumferential direction C and extending in the axial direction a. The plurality of division bars 12 includes a plurality of short division bars 121 and one long division bar 122. In the circumferential direction C, one unit groove 110 is formed between adjacent division bars 12.

The short division bar 121 partially separates adjacent two unit slots 110 and the long division bar 122 completely separates adjacent two unit slots 110. Alternatively, in the axial direction a, the short bars 121 partially fill the grooves 11 and the long bars 122 completely fill the grooves 11. It is understood that the division bar 12 may be, but is not limited to being, integrally formed with the outer and inner walls of the housing 10.

In the axial direction a, the short division bars 121 extend from the second end 10b to near the first end 10a, leaving a first communication zone 111 within the groove 11 near the first end 10a, such that adjacent cell grooves 110 are completely blocked near the second end 10b, communicating with each other only at the first communication zone 111.

The long barrier ribs 122 completely block the adjacent unit cells 110, and the coolant cannot flow between the adjacent two unit cells 110 over the long barrier ribs 122.

The inlet K1 and the outlet K2 may be located at two unit slots 110 adjacent to the long division bar 122, respectively, or the inlet K1 and the outlet K2 may be located at both circumferential sides of the long division bar 122 and located next to the long division bar 122, respectively.

It should be understood that the above description of "the long barrier ribs 122 completely block the adjacent unit cells 110" is merely to illustrate that the two unit cells 110 on both sides of the long barrier ribs 122 cannot directly communicate, and in fact, since the cells 11 are formed in a substantially annular shape in the circumferential direction C and the two unit cells 110 separated by the short barrier ribs 121 can still communicate in the first communication area 111, the two unit cells 110 separated by the long barrier ribs 122 are actually indirectly communicated through the plurality of first communication areas 111.

It should be understood that although the description above uses the spacer 12 (the short spacer 121 or the long spacer 122) to fill the groove 11, the process of forming the housing 10 does not necessarily need to form the groove 11 and fill the groove 11 with the spacer 12.

For example, the housing 10 may be formed by casting, and after demolding, the grooves 11 and the division bars 12 are formed at the same time. Since the opening 11k and the first communication zone 111 are both 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 by machining (e.g., milling). Since the opening 11k and the first communication area 111 are both located at the first end 10a, it is convenient for the cutter to extend into the interior of the housing 10 and to machine the groove 11.

It should be appreciated that the division bar 12 functions to enhance the structural strength of the housing body 10 in addition to separating the flow paths of the coolant.

A guide bar 13 is inserted into each cell groove 110. The deflector 13 has an elongated shape, which is connected to the cover 20 at a first end 10a to divide the unit cell 110 into two spaced apart portions (hereinafter also referred to as half-cells); the deflector 13 does not extend completely to the second end 10b, leaving a second communication zone 112 inside the tank 11 near the second end 10b, the two half tanks being able to communicate with each other via the second communication zone 112.

The flow guide strips 13 are arranged so that the cooling liquid flowing into each unit cell 110 can change its flow direction in the cell 110, so that the cooling liquid can flow from the first end 10a to the second end 10b in each unit cell 110, and change its flow direction at the second communication area 112 and then flow from the second end 10b to the first end 10a again.

Since the first communication area 111 and the second communication area 112 are respectively located at two 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.

The cooling fluid is then partially separated by the short division bars 121 and the flow-guiding bars 13 within the groove 11 for the entire groove 11, so that the cooling fluid alternately flows through the first communication zone 111 and the second communication zone 112 and alternately changes the flow direction in the axial direction a. The overall appearance is that the cooling liquid flows in a continuous S-shaped manner in the trough 11, which enables a uniform flow of cooling liquid through the shell 10 for a good cooling effect.

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

Referring to fig. 5, the cross section of the deflector 13 perpendicular to the axial direction a may be substantially cross-shaped (or fork-shaped). The cross-shaped structure comprises two mating parts 131 arranged facing away from each other and two sealing parts 132 arranged facing away from each other. The outer contour of the mating portion 131 corresponds to the outer contour of the connecting portion 10j, so that the deflector 13 is positioned just at 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, so that the tightness of the barrier of the guide strip 13 to the adjacent half groove is enhanced.

It should be appreciated that the cross-sectional shapes of the above-described flow-guiding strips 13 and connecting portions 10j may be varied. For example, the cross-section of the deflector 13 may be generally rectangular in shape without the sealing portion 132. For another example, referring to fig. 6, the connection portion 10j may be formed as a convex portion in the unit groove 110, and the guide strip 13 may be formed to have a concave portion to be fitted with the convex connection portion 10j.

Optionally, a rib 14 is also formed in the half groove. The ridge 14 is formed as a protrusion protruding radially inward or radially outward from two inner walls of the groove 11 opposite in the radial direction R in which the ridge 14 does not connect the two opposite inner walls, i.e., the ridge 14 does not space the half grooves apart in the circumferential direction C. Preferably, at least part of the protruding strips 14 are formed on the inner wall, and the protruding strips 14 are mainly used for increasing the area of the inner wall of the slot 11, thereby increasing the heat dissipation effect of the housing 10.

The length of the ridge 14 in the axial direction a is not limited in this application. Alternatively, to facilitate uniform flow of the coolant within the tank 11 (particularly during the diversion of the coolant through the first communication area 111), the ribs 14 do not extend to the first end 10a. Optionally, to facilitate the forming of the ribs 14, the ribs 14 extend to the second end 10b of the housing 10.

(second embodiment)

A second embodiment according to the present invention is described below with reference to fig. 7. The second embodiment is a modification of the first embodiment, the same reference numerals are given to the same or similar components as those in the first embodiment in terms of structure or function, and detailed description of these components is omitted.

In the present embodiment, the housing 10 is not formed in a cylindrical shape, but is formed in a substantially flat plate shape. The housing 10 is suitable for example for a housing surrounded by a plurality of separate panels, or may belong to a certain part within the housing. The housing 10 in the present embodiment may be curved, and may be formed in a semi-cylindrical shape having an arc-shaped cross section, for example.

For convenience of description, the two sidewalls of the case body 10 are referred to as an outer wall and an inner wall, respectively. A groove 11 is formed between the outer wall and the inner wall.

This embodiment corresponds to the case 10 of the first embodiment being expanded 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 comprises two long parting strips 122, which long parting strips 122 are formed as boundaries of the plate-shaped casing 10 in the second direction. The inlet K1 and the outlet K2 are located at both ends in the second direction, respectively.

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

(third embodiment)

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

In the present embodiment, both end portions of the housing body 10 in the first direction are formed with openings 11k, and each opening 11k is covered with a cover 20. Since each end has both the opening 11k and the groove bottom 11d, the end of the groove 11 in one axial direction is also called a partially closed groove bottom 11d, and the opposite side of the groove bottom 11d forms the opening 11k.

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

For two short division bars 121 at the junction of differently oriented openings 11k as shown in fig. 8, the two short division bars 121 form a first communication zone 111 at each of the two ends, and no flow guide bar 13 may be provided between the two short division bars 121. Of course, in this case, two guide strips 13 may also be provided between the two short spacer strips 121.

It will be appreciated that the above embodiments and portions of aspects or features thereof may be suitably combined.

Some advantageous effects of the above-described embodiments of the present invention are briefly described below.

(i) The shell provided by the invention has the advantages of simple structure and high reliability, and the shell is prevented from being formed into a cantilever structure.

(ii) The natural frequency of the shell is adjusted by changing the structure of the shell, so that the problem of the shell in NVH (noise, vibration and harshness) aspect is less.

(iii) Because the NVH characteristic of the shell is good, an additional silencing device outside the shell is not needed, and the cost is reduced.

(iv) The division bars 12 in the housing 10 serve both to restrict the flow direction of the coolant and to strengthen the structural strength of the housing.

(v) Since the main body of the housing body 10 is a single piece, the groove 11 is not formed by assembling separate inner and outer shells together, so that it is not necessary to perform secondary processing on the housing to improve the processing accuracy thereof.

It should be understood that the above-described embodiments are merely exemplary and are not intended to limit the present invention. Those skilled in the art can make various modifications and changes to the above-described embodiments without departing from the scope of the present invention. For example, the number of the cells to be processed,

(i) Although the division bar 12 is preferably integrally formed with the inner and outer walls of the housing 10, to improve the integration of the housing 10 and reduce vibration of the housing 10 during operation. However, in other possible embodiments, at least part of the parting bead 12 may also be formed as an insert structure similar to the parting bead 13.

(ii) Although it is preferred that the deflector 13 form a tight fit with the housing 10 to enhance the seal between the deflector 13 and the walls of the housing 10 and to reduce vibration between the various fittings of the housing during operation. However, the fitting relation between the flow guiding strip 13 and the connecting portion 10j (or the sealing degree between the flow guiding strip 13 and the wall of the groove 11) is not limited in the present application, because the flow guiding strip 13 has a flow guiding effect even if the flow guiding strip 13 and the wall of the groove 11 do not form a seal at the connecting portion 10j.

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

Claims

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

the inside of the housing body (10) is formed with a groove (11) between the outer wall and the inner wall and a plurality of division bars (12), the division bars (12) are arranged at intervals in a second direction, the groove (11) is formed with an inlet (K1) and an outlet (K2) communicating with the outside, so that a cooling liquid can enter the groove (11) from the inlet (K1) and leave the groove (11) from the outlet (K2),

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

the grooves (11) are divided into a plurality of unit grooves (110) by the plurality of division bars (12), guide bars (13) inserted through the openings (11 k) are arranged in at least one unit groove (110), the guide bars (13) are not contacted with the groove bottom (11 d), and the guide bars (13) can change the flow direction of the cooling liquid.
A housing according to claim 1, characterized in that the deflector (13) abuts against the cover (20) at an end close to the opening (11 k).
The housing according to claim 1, wherein the plurality of spacers (12) comprises a plurality of short spacers (121) and at least one long spacer (122),

the long parting strip (122) is formed as a closed boundary of the groove (11),

the short division bars (121) are connected with the tank bottom (11 d) in a closed manner, and a gap is left between the opening (11 k) and the case cover (20) so as to enable the adjacent unit tanks (110) to be communicated.
A housing according to any one of claims 1 to 3, characterized in that the groove (11) forms a completely closed groove bottom (11 d) at one end.
A housing according to claim 3, wherein the housing body (10) has a cylindrical shape, the number of the long division bars (122) is one,

the second direction is the circumference of the shell body (10), and in the second direction, the inlet (K1) and the outlet (K2) are respectively positioned at two sides of the long parting bead (122).
A housing according to claim 3, wherein the housing body (10) does not form a ring shape, two of the long parting strips (122) are provided, and in the second direction, two of the long parting strips (122) are provided at both ends of the groove (11), respectively,

the inlet (K1) is next to one of the two long parting strips (122) and the outlet (K2) is next to the other of the two long parting strips (122).
The housing according to any one of claims 1 to 6, characterized in that a connecting portion (10 j) is formed in the groove (11) to be fitted with the guide strip (13) to each other, the connecting portion (10 j) extending in the first direction.
The housing according to claim 7, wherein the connection portion (10 j) comprises grooves formed in two opposite inner walls of the groove (11),

on a section perpendicular to the first direction, the guide strip (13) is cross-shaped and comprises two mating parts (131) and two sealing parts (132),

the matching part (131) stretches into the groove, and the sealing part (132) is attached to two opposite inner walls of the groove (11).
The housing according to any one of claims 1 to 8, wherein at least one of two opposing walls of the groove (11) is formed as an uneven surface.
The housing according to claim 9, wherein one of two opposing inner walls of the groove (11) is partially raised towards the other to form a plurality of ribs (14), the ribs (14) extending in the first direction.
The housing according to any one of claims 1 to 9, characterized in that a seal is provided between the housing body (10) and the cover (20).
The housing according to any one of claims 1 to 11, wherein the plurality of division bars (12) are integrally formed with an inner wall and an outer wall of the housing 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.
An electric machine comprising a housing as claimed in any one of claims 1 to 13.
A vehicle comprising the electric machine of claim 14.