CN214788162U

CN214788162U - Electric cooling water pump

Info

Publication number: CN214788162U
Application number: CN202120618100.6U
Authority: CN
Inventors: 王同斌; 李业鑫; 吕鑫
Original assignee: Bosch Automotive Components Changchun Co Ltd
Current assignee: Bosch Automotive Components Changchun Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-11-19
Anticipated expiration: 2031-03-26

Abstract

The application provides an electric cooling water pump. Wherein the terminal hole in the insulating shell is communicated with the accommodating space. The stator installed in the accommodating space is provided with a limiting groove. The grounding terminal comprises a plugging part, a fixing part and a connecting part. The inserting part is inserted into the limiting groove and comprises two elastic arms, the inner sides of the free ends of the two elastic arms are provided with moving spaces, the outer sides of the free ends of the two elastic arms are provided with protrusions, and the protrusions are in electric contact with the inner wall of the limiting groove. The fixing part is arranged in the terminal hole, and the connecting part is electrically connected with the circuit board. The scheme is easy to realize, and the grounding effect of the grounding terminal is good.

Description

Electric cooling water pump

Technical Field

The present application relates to motor-driven devices, and more particularly to an electric cooling water pump including a brushless motor.

Background

The electric cooling water pump for driving the cooling water of the automobile comprises a pump assembly, a stator, a rotor and a circuit board. The stator is electrically connected to the circuit board through a ground terminal as shown in fig. 6. When the ground terminal is assembled with the stator, the ground terminal is inserted into a hole in the stator and interferes, and metal debris generated by the interference during the insertion process falls onto a circuit board on which electronic components are mounted, easily causing circuit failure.

SUMMERY OF THE UTILITY MODEL

The present application mainly solves at least one technical problem existing in the prior art.

In order to solve the above technical problem, the present application provides an electric cooling water pump, which includes:

the insulating shell is provided with an accommodating space and a terminal hole, and the terminal hole is communicated with the accommodating space;

the stator is arranged in the accommodating space and is provided with a limiting groove;

a circuit board mounted in the receiving space; and

the grounding terminal comprises a plug-in part, a fixing part and a connecting part, wherein the plug-in part is inserted into the limiting groove and comprises two elastic arms, the inner sides of the free ends of the two elastic arms are provided with a movable space, the outer sides of the free ends of the two elastic arms are provided with protrusions, the protrusions are in electric contact with the inner wall of the limiting groove, the fixing part is installed in the terminal hole, and the connecting part is electrically connected with the circuit board.

In some embodiments, the electric cooling water pump includes a rotor and a pump assembly, wherein the rotor is coaxially connected with the pump assembly, the rotor is relatively rotatably mounted in the housing space, and the rotor is electromagnetically coupled with the stator so as to generate rotation of the rotor relative to the stator when the electric cooling water pump is energized, so that the rotor drives the pump assembly to operate.

In some embodiments, the stator includes a core and an excitation winding, the core is provided with a plurality of magnetic poles, each of the magnetic poles is provided with the excitation winding, and the limiting groove is provided in the core.

In some embodiments, the core is assembled by stacking a plurality of laminations in an axial direction, and the limiting groove axially penetrates through the plurality of laminations.

In some embodiments, a yoke is provided between the magnetic poles, and the limiting groove is provided inside the yoke.

In some embodiments, the ground terminal is stamped and formed of a metal plate material, the insulating housing is manufactured by an injection molding process, the ground terminal is inserted into a terminal hole of the insulating housing in an insertion direction, and the insertion portion protrudes out of the terminal hole through the terminal hole.

In some embodiments, the insertion portion and the fixing portion of the ground terminal are located in the same plane, and a bend is formed between the fixing portion and the connecting portion.

In some embodiments, the insertion part is provided with a guide surface which is inclined to the insertion direction and located in front of the protrusion in the insertion direction, and a cut-out portion is provided between the insertion part and the fixing portion, the cut-out portion reducing the connection strength between the insertion part and the fixing portion.

In some embodiments, the insertion part has a first width in a free state of the two elastic arms, and has a second width in a state of elastically deforming the two elastic arms close to each other, the second width being smaller than a width of the fixing part.

In some embodiments, the fixing portion includes an interference portion and an extension portion, the interference portion has a width greater than that of the extension portion, a side of the interference portion is in interference fit with the terminal hole, and a side of the extension portion is in clearance fit with the terminal hole.

According to the technical scheme of this application, ground terminal's grafting portion includes two elastic arms, and the inboard of the free end of two elastic arms has the activity space, sets up protrudingly in the outside of the free end of two elastic arms, and the inner wall electric contact of back protrudingly and spacing groove after grafting portion inserts in the spacing groove, consequently, ground terminal can interfere with the spacing groove of stator with the elastic force that is gentler than prior art to reduce clastic production. The technical scheme is easy to realize, and the grounding effect of the grounding terminal is good.

Drawings

Specific embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 shows a schematic diagram of an embodiment of an electric cooling water pump;

FIG. 2 shows a schematic cross-sectional view of the electric cooling water pump taken along line A-A of FIG. 1;

FIG. 3 shows a schematic cross-sectional view of a portion of an insulated housing of an electric cooling water pump with a ground terminal mounted thereto;

FIG. 4 shows a schematic diagram of a ground terminal according to one embodiment;

FIG. 5 shows a schematic diagram of a ground terminal of yet another embodiment;

fig. 6 shows a schematic diagram of a conventional ground terminal.

Detailed Description

Referring to fig. 1 to 5, an electric cooling water pump 100 according to an embodiment of the present invention includes an insulating housing 1, a stator 2, a circuit board 3, a ground terminal 4, a rotor 5, and a pump assembly 6.

The insulating housing 1 is assembled from a plurality of parts, and in the embodiment shown in fig. 1, the insulating housing 1 includes three parts, an upper part, a middle part and a lower part. The insulating housing 1 may be manufactured by an injection molding process. A schematic cross-sectional view of the middle portion is shown in the embodiment shown in fig. 3. An accommodation space 10 is provided in the insulating housing 1, and the accommodation space 10 is used for each component. The receiving space 10 comprises three main parts. The pump unit 6 is mainly mounted in the upper housing space 10 of the insulating housing 1, the stator 2 and the rotor 5 constituting the armature are mainly mounted in the middle housing space 10 of the insulating housing 1, and the circuit components such as the circuit board 3 (shown by 4 in fig. 3) are mainly mounted in the lower housing space 10 of the insulating housing 1. In some embodiments, the receiving spaces 10 of the upper, middle and lower portions are spaced apart from each other to reduce the influence therebetween. A plurality of projections 12 are provided in the central housing space 10 of the insulating housing 1, a terminal hole (not shown) communicating with the housing space 10 is provided through one of the projections 12, and a positioning post 14 is provided at the tip of the other projection. For example, a terminal hole communicates the middle housing space 10 with the lower housing space 10, so that the ground terminal 4 mounted to the terminal hole can electrically connect the stator 2 in the middle housing space 10 and the electric circuit board 3 of the lower housing space 10.

The rotor 5 is coaxially connected with a pump assembly 6. The rotor 5 is relatively rotatably mounted in the housing space 10. The rotor 5 is electromagnetically coupled to the stator 2 to generate rotation of the rotor 5 relative to the stator 2 when the electric cooling water pump 100 is energized, so that the rotor 5 drives the pump assembly 6 to operate. The pump assembly 6 is, for example, a centrifugal hydraulic pump assembly. The operating pump assembly 6 pumps fluid in from the inlet 60 and out the outlet 62.

The stator 2 includes a core 20 and a field winding 24. The core 20 is assembled by stacking a plurality of magnetically conductive metal laminations in the axial direction (the axial direction of the rotor spindle, i.e., the up-down direction shown in fig. 1). The stator 2 is provided with a limiting groove 22, and the limiting groove 22 penetrates through the plurality of laminations in the axial direction. The core 20 is provided with a plurality of poles 26, each pole 26 having an excitation winding 24 mounted thereon. A retaining groove 22 is provided in the core 20. In some embodiments, as shown in fig. 2, the core 20 is provided with six poles 26. The magnetic poles 26 have a yoke 28 therebetween, and each two magnetic poles 26 are connected by the yoke 28 therebetween. The magnetic pole 26 and the yoke 28 are connected to form a substantially cylindrical shape as a whole. A pole shoe 25 is arranged on the inner side of each pole 26, viewed in the radial direction, and the outer side of each pole 26 is connected to a yoke 28. The yoke 28 is provided with a stopper groove 22 on the inner side.

The ground terminal 4 is stamped and formed of a metal plate material. The ground terminal 4 includes a mating portion 42, a fixing portion 44, and a connecting portion 48. The insertion part 42 includes two elastic arms 420, the inner sides of the free ends of the two elastic arms 420 have a moving space, and a protrusion 422 is provided on the outer sides of the free ends of the two elastic arms 420. The mating portion 42 and the fixing portion 44 of the ground terminal 4 are located in the same plane, and the fixing portion 44 and the connecting portion 48 have a bend therebetween. The socket 42 has a first width in a free state of the two elastic arms 420, and the socket 42 has a second width smaller than the width of the fixing portion 44 in a state in which the two elastic arms 420 are elastically deformed to be close to each other. The fixing portion 44 includes an interference portion 440 and an extension portion 442, and a width of the interference portion 440 is greater than a width of the extension portion 442. A cut-away portion 43 is provided between the mating portion 42 and the fixing portion 44, and the cut-away portion 43 reduces the connection strength between the mating portion 42 and the fixing portion 44. The plug-in part 42 is designed to be more resilient than in the prior art.

When mounted, the ground terminal 4 is inserted into the terminal hole of the insulating housing 1 in the insertion direction, and the insertion portion 42 protrudes out of the terminal hole through the terminal hole. The fixing portion 44 is mounted in the terminal hole, and the connecting portion 48 is electrically connected to the circuit board 3. When the stator 2 is further mounted, the insertion portion 42 of the ground terminal 4 is inserted into one of the limiting grooves 22, the positioning posts 14 are inserted into the other limiting grooves 22, and the stator 2 is seated on each of the protrusions 12. The two elastic arms 420 are elastically deformed toward each other, and the protrusion 422 is brought into close contact with the inner wall of the metal catching groove 22 by the elastic force of the elastic arms 420 to make electrical contact. The side of the interference portion 440 is in interference fit with the terminal hole, and the side of the extension portion 442 is in clearance fit with the terminal hole. In some embodiments, as shown in fig. 5, the mating part 42 is provided with a guide surface 424, the guide surface 424 being oblique to the insertion direction and being located in front of the protrusion 422 in the insertion direction. The insertion part 42 can be easily inserted into the stopper groove 22 by the guide of the guide surface 424. Since the ground terminal 4 can interfere with the stopper groove 22 of the stator 2 with a softer elastic force than that of the related art, the generation of debris can be effectively reduced. This technical scheme realizes easily, and ground terminal 4's ground connection is respond well.

Although described above, the present application is not limited to the above-described specific embodiments. For example, in some other embodiments, the ground terminal 4 may be fixed in the insulating housing 1 by insert molding. The scope of protection of this application is defined by the claims.

Description of the reference numerals

Electric cooling water pump 100

Insulating housing 1

Accommodating space 10

Lug 12

Positioning post 14

Stator 2

Core 20

Limiting groove 22

Excitation winding 24

Pole shoe 25

Magnetic pole 26

Magnetic yoke 28

Circuit board 3

Grounding terminal 4

Plug-in part 42

Elastic arm 420

Protrusion 422

Guide surface 424

Cut-out 43

Fixing part 44

Interference portion 440

Extension 442

Connecting part 48

Rotor 5

Pump assembly 6

Inlet 60

And an outlet 62.

Claims

1. Electric cooling water pump, its characterized in that, it includes:

an insulating housing (1) in which an accommodating space (10) and a terminal hole communicating with the accommodating space (10) are provided;

a stator (2) mounted in the housing space (10), the stator (2) being provided with a limit groove (22);

a circuit board (3) mounted in the housing space (10);

the grounding terminal (4) comprises a plug-in part (42), a fixing part (44) and a connecting part (48), the plug-in part (42) is inserted into the limiting groove (22), the plug-in part (42) comprises two elastic arms (420), the inner sides of the free ends of the two elastic arms (420) are provided with a moving space, a protrusion (422) is arranged on the outer side of the free ends of the two elastic arms (420), the protrusion (422) is in electric contact with the inner wall of the limiting groove (22), the fixing part (44) is installed in the terminal hole, and the connecting part (48) is electrically connected with the circuit board (3).

2. The electric cooling water pump according to claim 1, characterized in that it comprises a rotor (5) and a pump assembly (6), wherein the rotor (5) is coaxially connected with the pump assembly (6), the rotor (5) is relatively rotatably mounted in the housing space (10), and the rotor (5) is electromagnetically coupled with the stator (2) so as to generate rotation of the rotor (5) relative to the stator (2) when the electric cooling water pump is energized, so that the rotor (5) drives the pump assembly (6) to operate.

3. The electric cooling water pump according to claim 1, wherein the stator (2) includes a core (20) and an excitation winding (24), the core (20) is provided with a plurality of magnetic poles (26), the excitation winding (24) is mounted on each of the magnetic poles (26), and the retaining groove (22) is provided in the core (20).

4. The electric cooling water pump according to claim 3, wherein the core (20) is assembled by stacking a plurality of laminations in an axial direction, and the stopper groove (22) penetrates the plurality of laminations in the axial direction.

5. The electric cooling water pump according to claim 3, wherein a yoke (28) is provided between the magnetic poles (26), and the stopper groove (22) is provided inside the yoke (28).

6. The electric cooling water pump according to claim 1, wherein the ground terminal (4) is stamped and formed of a metal plate material, the insulating housing (1) is manufactured by an injection molding process, the ground terminal (4) is inserted into a terminal hole of the insulating housing (1) in an insertion direction, and the insertion section (42) protrudes out of the terminal hole through the terminal hole.

7. The electric cooling water pump according to claim 6, wherein the insertion portion (42) of the ground terminal (4) and the fixing portion (44) are located in the same plane, and a bend is provided between the fixing portion (44) and the connection portion (48).

8. The electric cooling water pump according to claim 7, wherein the insertion portion (42) is provided with a guide surface (424), the guide surface (424) being inclined to the insertion direction and located in front of the projection (422) in the insertion direction, a cut-out portion (43) being provided between the insertion portion (42) and the fixing portion (44), the cut-out portion (43) reducing a connection strength between the insertion portion (42) and the fixing portion (44).

9. The electric cooling water pump according to claim 6, wherein the socket part (42) has a first width in a free state of the two elastic arms (420), and the socket part (42) has a second width in a state in which the two elastic arms (420) are elastically deformed to be close to each other, the second width being smaller than a width of the fixing part (44).

10. The electric cooling water pump according to claim 9, wherein the fixing portion (44) includes an interference portion (440) and an extension portion (442), a width of the interference portion (440) is larger than a width of the extension portion (442), a side of the interference portion (440) is interference-fitted with the terminal hole, and a side of the extension portion (442) is clearance-fitted with the terminal hole.