CN216872992U

CN216872992U - Motor and electric pump

Info

Publication number: CN216872992U
Application number: CN202220695810.3U
Authority: CN
Inventors: 桥本幸子; 村田大辅; 坂本仁
Original assignee: Nidec Tosok Corp
Current assignee: Nidec Powertrain Systems Corp
Priority date: 2021-03-26
Filing date: 2022-03-25
Publication date: 2022-07-01
Anticipated expiration: 2032-03-25
Also published as: JP2022150292A

Abstract

A motor and an electric pump, which can restrain the number of parts of an electric power line. The disclosed device is provided with: a rotor rotatable by a rotation shaft; a stator having a core disposed so as to face the rotor and a coil, the coil having a wire wound around a part of the core, an end of the wire being drawn out from the core to one side in an axial direction in which the wire extends toward the rotary shaft; a housing having a housing bottom portion on the one side, housing the rotor and the stator therein, and having a first through hole through which an end portion of the lead wire passes in the housing bottom portion; an insulating case disposed on the one side with respect to the housing, the insulating case having a case bottom portion on the housing side, the case bottom portion having a second through-hole through which an end portion of the lead wire having passed through the first through-hole passes; and a connection terminal having a first connection portion connected to the wire in the insulating housing and a second connection portion connected to the wire led out of the motor in the insulating housing, and fixed to the insulating housing.

Description

Motor and electric pump

Technical Field

The present invention relates to a motor and an electric pump.

Background

Conventionally, the following configurations are known for a motor or an electric pump: the motor case accommodates the rotor and the stator therein, and the end of the coil wire of the stator is led out from the motor case to the outside of the motor case.

For example, patent document 1 shows the following structure: the rotor and the stator are housed in a case, lead wires of the stator coil are connected to conductive terminals through a cluster block in the case, the conductive terminals are led out from the case and connected to a cable in an inverter cover, and the cable is connected to a motor drive circuit in the inverter cover. The motor drive circuit is also connected to a lead wire for supplying drive power to the motor from the outside.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2014-088871

According to the structure of patent document 1, a large number of components are required to form a power line for supplying driving power from the outside to the stator coil, and the number of assembly steps and the like is large, which results in high cost.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to suppress the number of components of the power line.

One embodiment of the motor of the present invention includes: a rotor rotatable by a rotation shaft; a stator having a core disposed so as to face the rotor and a coil in which a lead wire is wound around a part of the core and an end of the lead wire is drawn out from the core to one side in an axial direction extending toward the rotary shaft; a housing having a housing bottom portion on the one side, housing the rotor and the stator therein, and having a first through hole through which an end portion of the lead wire passes in the housing bottom portion; an insulating case disposed on the one side with respect to the housing, the insulating case having a case bottom portion on the housing side, the case bottom portion having a second through-hole through which an end portion of the lead wire having passed through the first through-hole passes; and a connection terminal having a first connection portion connected to the wire in the insulating case and a second connection portion connected to a lead wire led out of the motor in the insulating case, the connection terminal being fixed to the insulating case.

In addition, an embodiment of the electric pump according to the present invention includes the motor and a pump unit driven by the motor.

According to the present invention, the number of components of the power line can be suppressed.

Drawings

Fig. 1 is a diagram conceptually showing the structure of an oil pump.

Fig. 2 is a diagram showing the structure of the stator.

Fig. 3 is a diagram showing the inside of the sensor unit.

Fig. 4 is a diagram showing the entire structure of the metal terminal with the resin portion of the substrate case removed.

Fig. 5 is a sectional view showing a structure in the vicinity of the through-hole.

Fig. 6 is a diagram showing a detailed structure of the first connection portion.

Fig. 7 is a view showing the first connection portion from a direction different from that of fig. 6.

Fig. 8 is a diagram showing a detailed structure of the second connection portion.

Fig. 9 is a diagram showing a positional relationship between the second connection portion and the lead.

Fig. 10 is a view showing a state in which the terminal portion of the lead is hooked on the second connecting portion.

Fig. 11 is a view showing a state in which the second portion of the second connection portion is bent.

Detailed Description

Hereinafter, embodiments of the motor and the electric pump according to the present disclosure will be described in detail with reference to the drawings. However, in order to avoid unnecessarily long descriptions below, it is easy for those skilled in the art to understand that the detailed descriptions above may be omitted. For example, detailed descriptions of already known matters and repetitive descriptions of substantially the same configuration may be omitted. In addition, elements described in the above-described drawings may be referred to as appropriate in the following description of the drawings.

Fig. 1 is a diagram conceptually showing the structure of an oil pump.

The oil pump 100 corresponds to an embodiment of the electric pump of the present invention.

The oil pump 100 includes a motor unit 110, a sensor unit 120, and a pump unit 130.

The motor unit 110 receives electric power supply and generates rotational driving force.

The sensor unit 120 detects rotation of the motor unit 110.

The pump section 130 is driven by the motor section 110 to suck and discharge oil.

The combination of the motor unit 110 and the sensor unit 120 corresponds to an embodiment of the motor of the present invention, and the pump unit 130 corresponds to an example of the pump unit described in the present invention.

The motor unit 110 includes a motor housing 111, a rotary shaft 112, a rotor 113, a stator 114, and a bearing 115.

The rotary shaft 112 is a member that transmits the rotational driving force of the motor unit 110. In the following description, the rotation axis 112 is sometimes used as a reference of the direction, and the direction along the rotation axis 112 is sometimes referred to as an axial direction. In the following description, regardless of the direction shown in the drawing, the upper side in fig. 1 is sometimes referred to as the one axial side, and the lower side in fig. 1 is sometimes referred to as the other axial side. In the following description, a direction perpendicular to and away from the rotation center line of the rotation shaft 112 is referred to as a radial direction, a direction close to the rotation shaft 112 is referred to as a radial inner side, and a direction away from the rotation shaft 112 is referred to as a radial outer side.

The motor housing 111 is a structure that supports the entire motor unit 110 and the oil pump 100, and is formed by, for example, press working of sheet metal. The motor housing 111 corresponds to an example of a housing according to the present invention, and houses the rotor 113 and the stator 114 therein. The motor housing 111 has a cylindrical portion 111a extending in the axial direction and a bottom portion 111b located on one axial side of the cylindrical portion 111 a. In other words, the motor housing 111 has a bottom 111b on one axial side, and the bottom 111b of the motor housing 111 corresponds to an example of the housing bottom according to the present invention. The sectional shape of the cylindrical portion 111a of the motor housing 111 is not particularly limited. The cross-sectional shape of the cylindrical portion 111a may be, for example, a perfect circle or an elliptical circle, a square or a rectangular square, or another polygon such as a triangle or a pentagon.

The rotor 113 is fixed to the rotating shaft 112, and is, for example, incorporated with a permanent magnet and rotates together with the rotating shaft 112 by the rotating magnetic field. In other words, the rotor 113 can be rotated by the rotation shaft 112.

The stator 114 is housed in the motor case 111 so as to face the rotor 113, and generates a rotating magnetic field. In the present embodiment, the inner rotor type structure in which the stator 114 is disposed radially outward of the rotor 113 is shown, but the motor of the present invention may have an outer rotor type structure in which the stator 114 is disposed radially inward of the rotor 113.

The bearing 115 is, for example, a ball bearing, and rotatably holds the rotary shaft 112. The bearing 115 may also be a roller bearing or a sliding bearing or the like. The bearing 115 is disposed on one axial side and the other axial side with the rotor 113 interposed therebetween, and the bearing 115 on one axial side is fixed to, for example, the bottom portion 111b of the housing 111. The bearing 115 on the other axial side is held by, for example, the pump section 130.

The sensor unit 120 includes a substrate case 121 and a sensor substrate 122.

The board case 121 corresponds to an example of an insulating case according to the present invention, and is disposed on one axial side of the motor case 111. The board case 121 is made of, for example, resin, and has a bottom portion 121a on the motor case 111 side.

The end of the lead wire drawn out from the coil of the stator 114 is guided to the board case 121, and in the present embodiment, the board case 121 is used as a lead-out space for the wiring of the motor unit 110. The substrate case 121 accommodates and holds the sensor substrate 122 therein, for example.

The sensor substrate 122 has a magnetic sensor, and detects, for example, a rotational position or a rotational speed of the rotary shaft 112. The substrate case 121 may house a control substrate or an inverter substrate together with the sensor substrate 122 or instead of the sensor substrate 122.

The pump section 130 has a pump housing 131 and an operating section 132. The motor housing 111 has a bottom portion 111b on one axial side, and the pump portion 130 is disposed on the other axial side of the motor housing 111. Therefore, the pump section 130 can be easily joined to the rotary shaft 112, and the oil pump 100 can be easily assembled.

The pump housing 131 houses the working unit 132 and is fixed to the motor housing 111.

The working portion 132 rotates in the pump housing 131 by the driving force of the rotary shaft 112, and performs suction and discharge of oil.

The pump section 130 corresponds to an example of the pump section according to the present invention. The pump section according to the present invention may have a structure different from the pump section 130 shown in fig. 1, for example, a structure separated from the holding portion of the bearing 115.

Fig. 2 is a diagram showing the structure of the stator.

The stator 114 has: a core 141 disposed to face rotor 113; and a coil 142 in which a wire is wound around a part of the core 141 and an end 143 of the wire is drawn out from the core 141 to one axial side. The end 143 of the coil 142 from which the lead wire is drawn is flexible, and therefore, it is difficult to stand by itself against gravity or unstable even when it stands by itself. In the present embodiment, a three-phase motor is used as an example, and therefore the coil 142 has end portions 143 of 3 groups of lead wires in total corresponding to each UVW.

When the motor section 110 is assembled, the stator 114 is inserted into the motor housing 111, for example, from the other axial side. When the stator 114 is inserted, the end 143 of the lead wire is positioned in front of the insertion, and the end 143 of the lead wire faces the bottom 111b of the motor case 111 as the stator 114 is inserted. The end 143 of the lead wire is guided from the motor 110 to the sensor 120.

In order to secure strength as a structural body and the like, a metal material is generally used for the motor case 111. Therefore, insulation between the end 143 of the wire and the motor housing 111 is required.

Fig. 3 is a diagram illustrating the inside of the sensor unit 120.

Fig. 3 shows a state in which one axial side of the substrate case 121 is open, and the sensor portion 120 includes a sensor substrate 122 housed in the substrate case 121 and a metal terminal 123 embedded in a bottom portion 121a of the substrate case 121. The substrate case 121 has a through hole 121b in the bottom 121a through which the end 143 of the lead passes. The metal terminals 123 and the through holes 121b are provided with 3 sets corresponding to the UVW of the motor, respectively.

The metal terminal 123 corresponds to an example of a connection terminal according to the present invention, and is connected to an end 143 of a lead wire. In the present embodiment, the metal terminals 123 are integrally formed with the board case 121 by insert molding, and the metal terminals 123 are fixed to the board case 121. In other words, the metal terminals 123 are embedded in the bottom portion 121a of the substrate case 121 and integrated with the substrate case 121.

The metal terminal 123 may be fixed to the board case 121 by a fixing method by snap-fitting, a fixing method in which a positioning protrusion of resin is put into a positioning hole of the terminal to melt the positioning protrusion, or the like, but the metal terminal 123 is integrally formed with the board case 121, whereby the number of parts can be further suppressed, and a work of fixing the metal terminal 123 to the board case 121 is not required.

Fig. 4 is a diagram showing the entire structure of the metal terminal 123 with the resin portion of the substrate case 121 removed.

In fig. 4, the resin portion of the substrate case 121 is removed for illustration, and thus the bottom portion 111b of the motor housing 111 can be seen. The motor case 111 has a through hole 111c in the bottom 111b through which the end 143 of the lead wire passes.

The metal terminal 123 has a first connection portion 123a at one end and a second connection portion 123b at the other end. The metal terminal 123 is embedded in the bottom portion 121a of the substrate case 121 except for the first connection portion 123a and the second connection portion 123b, and the first connection portion 123a and the second connection portion 123b of the metal terminal 123 protrude from the bottom portion 121a of the substrate case 121 toward the inside of the substrate case 121. The structures of the first and

second connection parts

123a and 123b will be described in detail later.

The end 143 of the lead wire passes through the through hole 111c provided in the bottom 111b of the motor case 111 as shown in fig. 3 and the through hole 121b provided in the bottom 121a of the board case 121 as shown in fig. 4, and reaches the inside of the board case 121. That is, the end 143 of the lead wire passing through the through-hole 111c of the motor case 111 passes through the through-hole 121b of the board case 121.

Since the opening of the through-hole 121b of the substrate case 121 is smaller than the opening of the through-hole 111c of the motor case 111, the end 143 of the lead wire is insulated from the motor case 111 by the substrate case 121. Here, the structure in the vicinity of the through-

holes

111c and 121b will be described in detail.

Fig. 5 is a sectional view showing the structure in the vicinity of the through-

holes

111c and 121 b.

The board case 121 has a cylindrical portion 121c protruding toward the motor case 111 and extending into the through-hole 111c of the motor case 111, and the through-hole 121b of the board case 121 passes through the cylindrical portion 121 c. In other words, the board case 121 has a cylindrical portion 121c that protrudes to the other side in the axial direction and extends into the through-hole 111c of the motor case 111, and the through-hole 121b of the board case 121 passes through the inside. By providing such a cylindrical portion 121c, the end 143 of the lead wire is appropriately insulated from the motor case 111, and other parts for insulation are not required, further suppressing the number of parts, man-hours, and cost.

The projecting end (i.e., the end on the other axial side) of the cylindrical portion 121c projects to the other axial side from the end surface 115a on one axial side of the bearing 115 fixed to the motor housing 111. By projecting the cylindrical portion 121c to such a position, the end 143 of the lead wire is better insulated with respect to the motor case 111 than in the case where the projection is short.

The following description is continued with reference to fig. 3 and 4.

The end 143 of the wire is fixed to the first connection portion 123a of the metal terminal 123 in the substrate case 121, and is electrically connected to the metal terminal 123. That is, the lead wires of the stator 114 are connected to the first connection portion 123a in the substrate case 121.

One end of a lead wire 124 drawn out of the substrate case 121 (i.e., out of the motor including the motor unit 110 and the sensor unit 120) is accommodated in the substrate case 121. The lead 124 has: resin-coating the coated wire portion 124a covering the metal wire; and a terminal portion 124b connected to the metal wire, and the lead wire 124 supplies power to the motor portion 110. The terminal portion 124b of the lead 124 is fixed to the second connection portion 123b of the metal terminal 123, and is electrically connected to the metal terminal 123. That is, the lead 124 is connected to the second connection portion 123b in the board case 121.

Since the end 143 of the lead wire and the lead wire 124 are electrically connected by the metal terminal 123, the number of parts forming the power line with respect to the motor portion 110 is suppressed, thereby suppressing the cost.

Fig. 6 is a diagram illustrating a detailed structure of the first connection portion 123a, and fig. 7 is a diagram illustrating the first connection portion 123a from a direction different from that of fig. 6.

The first connection portion 123a protrudes inward from the outside of the through-hole 121b of the substrate case 121.

More specifically, the first connection portion 123a includes: a first portion 151 that rises to one axial side at an end portion protruding inward of the through-hole 121 b; a second portion 152 extending along the bottom 121a of the substrate case 121 continuously with the first portion 151; and a third portion 153 folded back continuously from the second portion 152 to the side opposite to the direction in which the second portion 152 extends.

The end 143 of the wire is caulked by the second portion 152 and the third portion 153 of the first connection portion 123a in the substrate case 121. Thereby, the end 143 of the wire is fixed to the first connection portion 123a and electrically connected to the first connection portion 123 a. The end 143 of the lead wire is firmly fixed to the first connection portion 123a by soldering.

Since the first connection portion 123a protrudes inside the through-hole 121b, the end portion 143 of the lead is connected to the first connection portion 123a on the extension line of the through-hole 121b, and therefore, the end portion 143 can be easily routed. Further, since the second portion 152 and the third portion 153 are held on the one axial side with respect to the through-hole 121b by the first portion 151 rising on the one axial side, a caulking operation, a soldering operation, or the like for connecting the end 143 of the lead wire to the first connection portion 123a is easy.

Fig. 8 is a diagram showing a detailed structure of the second connection portion 123b, and fig. 9 is a diagram showing a positional relationship between the second connection portion 123b and the lead 124.

The second connection portion 123b protrudes in a plate-like manner from the bottom portion 121a of the board housing 121 toward one axial side, and the board housing 121 has a step portion 121d protruding from the bottom portion 121a around the second connection portion 123b so as to surround the second connection portion 123 b. In other words, the table portion 121d surrounds the second connection portion 123b protruding toward one axial side and protrudes from the bottom portion 121a of the board housing 121 toward one axial side to a middle of the second connection portion 123 b. The second connecting portion 123b is reinforced by the mesa portion 121 d.

The plate-shaped second connection portion 123b extends in a protruding direction H protruding from the bottom portion 121a of the substrate case 121, and also extends in an extending direction W along the bottom portion 121a of the substrate case 121.

The second connection portion 123b includes: a first portion 161 protruding from one side in the extending direction and extending to one side in the axial direction; and a third portion 163 protruding from the other side of the extending direction apart from the first portion 161. The second connecting portion 123b has a second portion 162 protruding toward the other side in the extending direction along the bottom portion 121a of the board housing 121 at the end of the first portion 161 protruding toward one side in the axial direction. A V-groove 164 is provided at a boundary portion between the first portion 161 and the second portion 162.

The terminal portion 124b of the lead 124 connected to the second connection portion 123b has a rectangular long hole 124c, and the terminal portion 124b is hooked on the second connection portion 123b so that the long hole 124c crosses over the first portion 161 and the third portion 163 of the second connection portion 123 b. Thereby, the orientation and position of the lead wire 124 with respect to the second connection portion 123b are determined. The terminal portion 124b of the lead 124 is hooked on the second connection portion 123b and temporarily held, whereby the subsequent soldering operation and the like are facilitated.

The substrate case 121 is provided with a guide projection 121e projecting from the bottom portion 121a toward one axial side. The guide projection 121e guides the wire 124 in the board housing 121, thereby stabilizing the routing path of the wire 124 in the board housing 121 and suppressing contact of the other wires 124 with the second connecting portion 123b and the terminal portion 124 b.

Fig. 10 and 11 are views showing a procedure for connecting the terminal portions 124b of the leads 124 to the second connecting portions 123 b.

Fig. 10 shows a state in which the terminal portions 124b of the leads 124 are hooked on the second connection portions 123 b.

As described above, the terminal portion 124b of the lead 124 is hooked so as to straddle the first portion 161 and the third portion 163 of the second connecting portion 123b, and as a result, the second portion 162 of the second connecting portion 123b penetrates the terminal portion 124b of the lead 124 toward one axial side and protrudes from the terminal portion 124b of the lead 124.

When the terminal portion 124b of the lead 124 is hooked on the second connection portion 123b, the land portion 121d prevents the terminal portion 124b from falling into the bottom portion 121a side of the board housing 121, and thus the operation of hooking the terminal portion 124b on the second connection portion 123b is easy. Since the terminal portion 124b hooked on the second connection portion 123b is supported at a position separated from the bottom portion 121a, a subsequent soldering operation and the like are facilitated.

As shown in fig. 10, after the terminal portion 124b of the lead 124 is hooked on the second connection portion 123b, the second portion 162 of the second connection portion 123b is bent.

Fig. 11 illustrates a state in which the second portion 162 of the second connection portion 123b is bent.

The second portion 162 protruding from the terminal portion 124b of the lead 124 is bent at a portion of the V-shaped groove 164 as a fold line. By the subsequent soldering operation, the terminal portion 124b is fixed to the second connection portion 123b, and the lead 124 is electrically connected to the second connection portion 123 b. Since the terminal portion 124b is prevented from coming off by bending the second portion 162, soldering work and the like are facilitated.

Here, an oil pump is given as an example of a method of using the motor and the electric pump of the present invention, but the method of using the motor and the electric pump of the present invention is not limited to the above method. The electric pump of the present invention can be used as a pump for sucking and discharging water, air, or the like, and the motor of the present invention can be used in a wide range of applications such as a power steering device, a compressor, and the like.

The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the claims, not by the embodiments described above, and includes all modifications equivalent in meaning and scope to the claims.

(description of reference numerals)

100: an oil pump; 110: a motor section; 111: a motor housing; 111 a: a barrel portion; 111 b: a bottom; 111 c: a through hole; 112: a rotating shaft; 113: a rotor; 114: a stator; 115: a bearing; 120: a sensor section; 121: a substrate housing; 121 a: a bottom; 121 b: a through hole; 121 c: a cylindrical portion; 121 d: a table section; 121 e: a guide protrusion; 122: a sensor substrate; 123: a metal terminal; 123 a: a first connection portion; 123 b: a second connecting portion; 124: a lead wire; 151: a first portion of a first connection; 152: a second portion of the first connection; 153: a third portion of the first connection; 161: a first portion of a second connection; 162: a second portion of the second connection portion; 163: a third portion of the second connection; 130: a pump section; 131: a pump housing; 132: a working part; 141: an iron core; 142: a coil; 143: the ends of the wires.

Claims

1. A motor is characterized by comprising:

a rotor rotatable by a rotation shaft;

a stator including a core disposed to face the rotor and a coil wound with a wire at a portion of the core, an end of the wire being drawn out from the core to one side in an axial direction extending toward the rotary shaft;

a housing having a housing bottom portion on the one side, housing the rotor and the stator therein, and having a first through hole through which an end portion of the lead wire passes in the housing bottom portion;

an insulating case disposed on the one side with respect to the housing, the insulating case having a case bottom on the housing side and a second through hole on the case bottom, the end portion of the lead passing through the first through hole passing through the second through hole; and

the connecting terminal is provided with a first connecting part and a second connecting part, the first connecting part is arranged in the insulating shell and connected with the lead, the second connecting part is arranged in the insulating shell and connected with a lead led out of the motor, and the connecting terminal is fixed on the insulating shell.

2. The motor of claim 1,

the insulating housing is made of resin, and the connection terminal and the insulating housing are integrally formed.

3. The motor according to claim 1 or 2,

the insulating housing has a cylindrical portion protruding toward the other side with respect to the one side and extending into the first through-hole, and the second through-hole passes through the inside.

4. The motor of claim 3,

a bearing that holds the rotating shaft of the rotor rotatably and is fixed to the bottom of the housing,

the cylindrical portion protrudes to the other side than the end surface on the one side of the bearing.

5. The motor of claim 1,

the second connecting portion protrudes from the case bottom toward the one side.

6. The motor of claim 5,

the second connecting portion has a protruding portion protruding along the bottom of the housing at an end portion protruding to the one side.

7. The motor according to claim 5 or 6,

the insulating housing has a step portion that surrounds the second connection portion protruding toward the one side and protrudes from the housing bottom toward the one side to a middle of the second connection portion.

8. The motor according to claim 1 or 2,

the first connection portion protrudes inward from an outer side of the second through-hole.

9. The motor of claim 8,

the first connection portion has: a first portion in which an end portion protruding inward of the second through-hole rises to the one side; a second portion extending along the bottom of the housing continuously with the first portion; and a third portion that is folded back continuously with the second portion to a side opposite to a direction in which the second portion extends.

10. The motor according to claim 1 or 2,

the insulating case has a guide protrusion protruding from the case bottom toward the one side and guiding the lead wire inside the insulating case.

11. An electric pump is characterized by comprising:

the motor of claim 1 or 2; and

a pump section driven by the motor.