KR20180065641A - Ground Structure for D.C Motor of Vehicle - Google Patents

Abstract

According to the present invention, there is provided a ground structure of a DC motor for a vehicle that includes: a cover assembly; a lower housing coupled to the cover assembly; a yoke assembly having a plurality of magnetic poles disposed in the cover assembly; an armature core having a plurality of extreme values and on which coils interacting with the magnetic poles are wound; an amateur assembly including upper and lower insulators installed on upper and lower portions of the armature core; a commutator installed below the armature core and having the same number of commutator thin films corresponding to the magnetic poles; and a brush holder disposed inside the housing and having a brush selectively in contact with the commutator as the armature assembly rotates. The armature core and the commutator are rotated with a rotational shaft inserted between the armature core and the commutator. The ground structure includes a ground means which includes a power supply connector having a ground connector pin of the power supply connector coupled to a connector receiving portion of the brush holder; a ground terminal protruding from one side of the ground connector pin; and a ground-coupling fitting groove of the yoke cylindrical body, which is coupled with the ground terminal.

Description

[0001] The present invention relates to a ground structure for a DC motor for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a grounding structure of a DC motor for a vehicle, and more particularly, to a DC motor used for a vehicle air conditioner or a braking device having an excellent motor efficiency while preventing a breakdown or malfunction of the motor by improving grounding capability.

      Generally, a DC motor as disclosed in JP-A-2001-0097340 and JP-A-2003-0035232 has been introduced as an apparatus for sucking outside air for operation of an air conditioning system which is an automotive air conditioner.

The direct current motor rotates a blower fan to circulate the air in the atmosphere or the interior of the vehicle through air around the evaporator, thereby changing the high temperature and high humidity air into low temperature dehumidified air to be introduced into the room Ensure a pleasant environment.

The direct current motor is configured such that an armature is rotatably disposed inside a yoke on which magnets are arranged on the inner circumferential surface. The armature has a plurality of teeth extending radially from the rotation axis, and a plurality of slots for the armature coil winding are formed in the axial direction between the extreme value and the adjacent extreme values.

A plurality of coils are wound around the slots at predetermined intervals, and each of the coils is connected to a commutator thin film (segment) of a commutator mounted on a rotating shaft spaced a predetermined distance from the armature .

Each commutator thin film is connected to a brush so as to be energized.

Accordingly, when an electric current is supplied to the commutator from the brush, an electric field is formed in each of the coils, and the interaction between the generated electric field and the magnet attached to the yoke rotates the rotating shaft equipped with the armature and the commutator, So that the blower fan is rotationally driven to be applied to a vehicle air-conditioning system or the like.

Such a DC motor can be used in an ABS (Anti-Lock Brake System) system used in a vehicle braking system because of its wide and high precision speed control capability.

In recent years, various motors having various structures have been researched and developed in order to maximize the miniaturization of the motor and the driving efficiency as well as to prevent noise and vibration in accordance with the demand of the DC motor market.

      The DC motors disclosed in the above-mentioned JP-A-2001-0097340 and 2003-0035232 have been developed by inserting a rubber for absorbing noise and vibration on the side of a motor in the case of electrons, but the vibration of the motor in the up- In the latter case, an O-ring is inserted in the upper and lower portions of the motor, and the problem that the vibration prevention effect becomes weak due to increase in hardness due to O-ring compression is a problem there was.

      In the conventional DC motor, the power supply connector for energizing the brush is provided so as to be able to be coupled with the support of the brush holder. However, since the assembly is not firmly carried out, safety is poor and a ground structure is provided to the brush holder If the leakage current flows through the bearing, a spark or an arc is generated between the narrow bearings. If the leakage current flows through the bearing, There is a problem that the bearings are easily broken due to the occurrence of bearing erosion which causes grooves on the bearing surface.

      Accordingly, a method has been proposed in which a separate ground frame is formed in the bearing cover for grounding the motor, a hole is formed in the bearing cover, and the ground terminal is fixed to the hole. However, these methods complicate the structure of the bearing cover Thereby increasing the overall size of the motor. As a result, it is difficult to install and disassemble the motor due to the complicated structure.

Accordingly, the present inventors intend to propose a stabilized DC motor for a vehicle with higher efficiency in view of the above-mentioned circumstances.

Disclosure of Invention Technical Problem [8] The present invention aims to prevent a leakage current generated during power supply from being transmitted to a bearing housing, thereby preventing reliability degradation of a motor due to bearing damage.

It is also a technical object of the present invention to provide a grounding means with a simple structure, so that the grounding means can be assembled in a reliable manner.

The present invention relates to a cover assembly,

A lower housing coupled to the cover assembly; a yoke assembly having a plurality of magnetic poles disposed in the cover assembly;

An armature core having a plurality of extreme values for winding coils interacting with the magnetic pole; and an armature assembly including upper and lower insulators provided on and below the armature core;

A commutator installed below the armature core and having the same number of commutator thin films corresponding to the magnetic pole; A brush holder disposed inside the housing, the brush holder including a brush selectively in contact with the commutator as the armature assembly rotates;

, ≪ / RTI >

Wherein the armature core and the commutator are configured to rotate together with the rotation shaft fitted in the center,

A grounding connector pin of a power supply connector coupled to a connector seating portion of the brush holder; A ground terminal protruded from one side of the grounding connector pin; And grounding means for grounding coupling of the yoke cylindrical body to be coupled with the ground terminal.

The ground terminal formed on the grounding connector pin without a complicated grounding structure such as a method of forming a separate grounding frame on the bearing cover or inserting a hole into the bearing cover and fixing the grounding terminal to the hole, It is possible to perform the assembling process of the grounding means easily by providing a simple structure to sandwich the cylindrical body, and at the same time, more reliable grounding is performed, thereby eliminating the breakage or malfunction of the motor.

1 is a configuration diagram of a motor according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the motor of FIG. 1; FIG.
3 is an exploded perspective view of the DC motor driving unit of FIG.
4 is an end view of the motor, which is an example of the present invention.
5 is an exploded perspective view of a shock absorber for vibration and noise reduction provided on the rotating shaft of the present invention.
Fig. 6 is an internal configuration diagram of the buffer means of Fig. 5;
Fig. 7 is a view showing a coupling structure of the buffering means of Fig. 5 to the cover assembly;
Fig. 8 is a diagram showing the installation structure of a power supply connector according to the present invention.
FIG. 9 is a partially assembled view of the power supply connector of the present invention in a state in which it is disconnected. FIG.
10 is a partially exploded perspective view of the brush holder and the power supply connector of the present invention.
Fig. 11 is a view showing a coupling structure for explaining the insulating means of the present invention. Fig.
12 is an exploded perspective view of the insulating means of the present invention.
Fig. 13 is a configuration diagram of the insulation means of Fig. 12 combined with a commutator. Fig.
Fig. 14 is a partial assembled view of the inside of a motor provided with the commutator and the insulation means of the present invention. Fig.
Hereinafter, a preferred embodiment of the motor according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a DC motor M according to an embodiment of the present invention; and FIG. 2 is a cross-sectional view of a direct current motor M having a brush holder left and right vibration and noise- FIG. 2 is an exploded perspective view of the motor of FIG. 1, FIG. 3 is an exploded perspective view of the DC motor driving unit of FIG. 2, and FIG. 4 is an end view of the motor according to one example of the present invention.

1 to 4, a DC motor M according to an embodiment of the present invention includes a cover assembly 10, an armature assembly 20, a yoke assembly 30, (40).

The configuration of the present invention includes a cover assembly (10);

A yoke assembly 30 having a lower housing 40 coupled to the cover assembly 10 and a plurality of magnetic poles 31 disposed within the cover assembly 10;

An armature core 22 having a plurality of extreme values 22A wound with coils 21 interacting with the magnetic pole 31 and upper and lower insulators 23 coupled to the upper and lower portions of the armature core 22, An armature assembly (20) including an armature (24);

A commutator 50 provided below the armature core 22 and having the same number of commutator thin films 51 corresponding to the exciting magnetic poles 31; And a brush holder (60) disposed inside the lower housing (40) and including a brush (61) selectively in contact with the commutator (50) as the armature assembly (20) rotates;

, ≪ / RTI >

The armature core 22 and the commutator 50 are configured so as to rotate together with the rotation shaft 70 sandwiched between the armature core 22 and the commutator 50,

A grounding connector pin 100-3 of the power supply connector 100 coupled to the connector seating portion 63 of the brush holder 60; A ground terminal 100-3 '' protruding from one side of the grounding connector pin 100-3 and a grounding coupling 100-3 '' of the yoke cylindrical body 32 engaged with the grounding terminal 100-3 ' And a grounding means 110 including a power supply connector 100 composed of a groove 32D.

Further, the upper and lower, left, and right vibration and noise damping buffering means (80) are provided on the rotary shaft (70) A brush holder left and right vibration and noise damping means 90 installed in the brush holder 60 and fitted to the yoke cylindrical body 32 constituting the yoke assembly 30; And an insulation means 120 disposed above the commutator 50 installed at the center of the support 62 of the brush holder 60 to provide a DC motor M applied to the present invention .

The cover assembly 10 includes a rotating shaft hole 10A into which the rotating shaft 70 is inserted and upper and lower brackets 81 and 82 which constitute a buffering means 80 for downward, A cooling hole 10C is formed between the support piece 10B and the support piece 10B that surrounds and supports the support portions 81A and 82A of the rotary shaft 82 and the rotary shaft 70 is rotated by the rotary shaft 70, A fan 130 is inserted and installed.

The yoke assembly 30 includes a plurality of magnetic poles 31 arranged in the yoke cylindrical body 32 and the magnetic poles 31 are composed of two pairs of quadrupole magnets.

As shown in FIG. 3, upper and lower rims of the yoke cylindrical body 32 are formed at the bent ends of the supporting portions 81A and 82A of the upper and lower brackets 81 and 82, respectively. The upper and lower protruding portions 32A and 32B are formed at positions corresponding to the groove portions 81C and 82C so that the recessed portions 81C and 82C of the upper and lower brackets 81 and 82, The upper and lower brackets 81 and 82 support the yoke cylindrical body 32 in a rigid state so that the yoke cylindrical body 32 can be coupled and held. And the upper and lower elastic cushion members 83 and 84 constituting the shock absorbing means 80 for forming the upper, lower, left and right vibration and noise damping portions 80D and 82D, The upper and lower elastic cushioning members 83 and 84 are engaged with the upper and lower brackets 81 and 82 so that the upper and lower elastic cushions 83 and 84 can be firmly engaged with the upper and lower brackets 81 and 82 Can be configured.

The positions of the recessed portions 81C and 82C of the upper and lower brackets 81 and 82 are set such that the positions of the upper and lower protrusions 32A and 32B formed on the yoke cylindrical body 32, In this case, the positions of the upper and lower recessed portions 81C, 82C and the projections 32A, 32B can be designed to be changeable.

The fitting protrusions 83A and 84A can form the locking protrusions 83A 'and 84A' to ensure a firm coupling.

The upper and lower elastic cushioning members 83 and 84 are configured to surround the outer peripheries of the upper and lower bearings 140 and 150 housing covers 81E and 82E of the upper and lower brackets 81 and 82 The outer periphery of the upper elastic cushion member 83 is brought into contact with the inner side surface of the rotary shaft hole 10A of the cover assembly 10 while the outer periphery of the lower elastic cushion member 84 is brought into contact with the center of the lower housing 40 And can be provided so as to be provided so as to be in contact with the inner circumferential side surface of the recessed portion.

Therefore, the upper and lower elastic cushioning members 83 and 84 surround the outer peripheries of the upper and lower bearings 140 and 150 of the upper and lower brackets 81 and 82, respectively, The inner side surface of the rotary shaft hole 10A of the cover assembly 10 is firmly coupled with the outer circumferential surfaces of the upper and lower elastic cushioning members 83 and 84 so as to be in a solid state, So that coupling with the yoke cylindrical body 32 is made via the lower brackets 81 and 82.

The upper and lower elastic cushioning members 83 and 84 are provided with an elastic polymer formed in a ring-shaped concavo-convex waveform so that vibration generated upon rotation of the rotation shaft 70 is transmitted to each of the upper and lower brackets 81 and 82 The upper and lower elastic cushion members 83 and 84, which are wrapped around the outer periphery of the receiving covers 81E and 82E even though they are transmitted to the upper and lower bearings 140 and 150, The rigidity of the cushioning members 83 and 84 that perform the damper function is increased so that the pitching and yawing phenomenon can be eliminated and the vibration generated in the brush holder 60 is absorbed by the yoke cylinder The transmitted vibrations are transmitted to the upper and lower elastic cushions 83 and 84 through the upper and lower brackets 81 and 82 so as to be cushioned so that the noise due to the vibration is greatly attenuated .

In the present invention, there is provided a brush holder left and right vibration and noise damping means 90 fitted to the yoke cylinder 32 constituting the yoke assembly 30 provided in the brush holder 60 The noise generated in the brush holder 60 can be suppressed.

That is, the buffering means 90 for damping the left and right vibration and noise of the brush holder is provided with a plurality of cushioning members 62A and 62B coupled to a plurality of fitting protrusions 62A protruding from the support body 62 of the brush holder 60, Member 90A; A fitting recessed portion 90A 'formed at the periphery of the cushioning member 90A; And the fitting recess 90A 'of the cushioning member 90A may be fitted in the fitting protrusion 32C formed around the lower portion of the yoke cylindrical body 32. As shown in FIG.

The fitting space 90A '' is formed in the buffer member 90A so that the fitting protrusion 62A can be fitted.

The front and rear engaging protrusions 90A-1 are formed at both inner ends of the fitting space 90A "of the buffer member 90A. The engaging protrusions 90A-1 and 90A- The fitting projection 62A and the cushioning member 90A can be firmly engaged by fitting the recessed portion 62A-1 of the recessed portion 62A.

The fitting protrusion 32C formed around the lower portion of the yoke cylindrical body 32 is formed as a protruding piece protruded at both ends of the space portion 32C 'formed at the center, and the inner lower end of the space portion 32C' The both side fitting protrusions 32C of the yoke cylindrical body 32 are sandwiched between both sides of the fitting recessed portion 90A 'of the cushioning member 90A, Can be combined.

The brush holder 60 is constructed such that a brush 61 is sprung with a spring 61B inside a brush case 61A of a cylindrical support 62 to bring the brush 61 into contact with the commutator foil 51, And a cushioning member 90A made of a rubber material or an elastic polymer can be sandwiched between the fitting protrusions 62A protruding in three directions of the support body 62. [

In the cushioning means 90 for damping the left and right vibrations and noise of the constitution as described above, the left and right vibrations, that is, the pivot movements, which occur when the brushes 61 interfere with and separate from each other between the commutator foil 51 and the thin film 51 The residual vibration oscillated by the cushioning member 90A is transmitted to the yoke cylindrical body 32 as described above and can be annihilated by the upper and lower elastic cushions 83 and 84 So that noise caused by vibration can be greatly reduced.

The present invention also provides a grounding means 110 including a power supply connector 100 coupled to a connector seating portion 63 formed on a support 62 of a brush holder 60, And it is possible to prevent breakage of the bearings 140 and 150 at the same time.

That is, the grounding means 110 sandwiches the brush 61 on the commutator foil 51 by making the brush 61 sandwiched by the spring 61B inside the brush case 61A of the cylindrical support 62, The brush holder 60 is configured such that power is supplied to the brush holder 60 through the engagement hole 63A formed at both ends of the connector seat 63 formed on the support 62 of the brush holder 60 of the support 62. [ The engaging jaws 100-1 "of the fastening pieces 100-1 'protruding from both ends of the main body 100-1 of the supplying connector 100 are engaged and fastened to the inside of the main body 100-1 The fitting projection connecting pieces 100-2 'and 100-3' protruding downward from the grounding connector pin 100-2 and the grounding connector pin 100-3 are connected to the connector seating portion 63 ) 100-3 '' of the fitting projecting connection piece 100-2 'and 100-3', respectively, of the choke coil 160, And one terminal is interposed therebetween, A ground terminal (100-3 " ') is formed at one side of the connector pin (100-3) configured to fit in ground coupling fitting groove (32D) for the cylindrical yoke body 32.

The grounding terminal 100-3 '' 'protrudes above one side of the grounding connector pin 100-3, and the hooking jaw 100-3' '' bent inward is connected to the grounding of the yoke cylindrical body 32 And can be engaged with the fitting groove 32D for engagement.

The grounding means 110 included in the power supply connector 100 having the above-described structure is provided with the engagement protrusions 100 (100-1 ') of the engagement piece 100-1' formed in the main body 100-1 of the power supply connector 100 Power source connector pin 100-2 and the grounding connector pin 100 (refer to FIG. 1) mounted on the inside of the main body 100-1 by fastening them to the retaining hole 63A of the connector seating portion 63, 3 ') protruding downward from the bottom of the connector seating part 63 so as to protrude downward from the bottom surface of the connector seating part 63, so that the choke coil 160 and the choke coil 160 Electrical connection is made

The engaging step 100-3 "" of the ground terminal 100-3 '"formed on the grounding connector pin 100-3 is inserted into the grounding engaging groove 32D of the yoke cylindrical body 32 The grounding connector pin 100-3 is grounded without a complicated grounding structure such as a method of forming a separate grounding frame on the bearing cover or inserting a hole in the bearing cover and fixing the grounding terminal to the hole, It is possible to easily perform the assembling process of the grounding means 110 by providing a simple structure for forming the terminal 100-3 '' '.

The amateur assembly 20 shown in the present invention includes an armature core 22 having a plurality of extreme values 22A wound with coils 21 interacting with the plurality of magnetic poles 31, And an upper and a lower insulator 23 and 24 coupled to the upper and lower portions of the armature core 22 and disposed at the lower portion of the armature core 22 and correspondingly to the extreme values 22A, 51). ≪ / RTI >

A rotating shaft 70 passes through the center of the armature core 22 and the commutator 50. When the motor M is operated, the armature core 22 and the commutator 50 rotate together with the rotating shaft 70 . At this time, bearings 140 and 150 for rotatably supporting the rotary shaft 70 may be provided on the rotary shaft 70 and the lower portion thereof.

A coil 21 is wound around each of the extreme values 22A and when a current is applied to the coil 21, a torque is generated through interaction with the magnetic pole 31.

The coil 21 is wound on a coil connection hook 51A of the commutator thin film 51 which is protruded and bent radially outward from the upper side of the commutator thin film 51, It is possible to make the coil winding required by repeating the operation of connecting the coil 21 to the piece 51A. After the coil 21 is caught by the catching piece 51A, the coil covering of the connecting portion is broken, Connection is established.

Particularly, in the present invention, the contact of the coil 21 connected to the commutator 50 is insulated from the contact to eliminate a short-circuit phenomenon, and a magnetic field is prevented from leaking around the rotating shaft 70 fitted to the commutator 50, It is possible to provide and provide insulation means 120 for improving reliability.

3, 12, and 13, the insulator 120 disposed above the commutator 50 disposed at the center of the support 62 of the brush holder 60 is disposed above the commutator 50, 121 formed on the support base plate 120A; A plurality of insulating protrusions 120B radially disposed at a predetermined interval below the periphery of the supporting disk 120A; And a rotating shaft insulating cylinder 120C in which a rotating shaft 70 integrally protruding from the center of the supporting disk 120A is inserted. The insulating means 120 may include a rubber material or a polymer for insulation .

The insulation means 120 having such a structure is formed by inserting a fitting projection 50A 'protruding from the commutator main body 50A provided below the armature assembly 20 into the insertion hole 121 formed in the supporting circular plate 120A A plurality of insulating protruding pieces arranged radially below the periphery of the supporting circular plate 120A between the coil connecting latching pieces 51A and the coil connecting latching pieces 51A of the commutator 50, 120B and the insulating protruding piece 120B are positioned so that the contact and the contact of the coil 21 connected to the coil connecting piece 51A are insulated by the insulating protruding piece 120B.

The coil 21 connected to the coil connection engaging piece 51A radially disposed on the thin film 51 of the commutator 50 is wound around the coil 21 at the extreme value 22A of the armature core 22, The coil 21 and the coil 21 connected to the coil connection engaging piece 51A are not in contact with each other when the DC motor M is driven even when the coil 21 is wound on the extreme 22A of the armature core 22, It is possible to prevent the motor from being deteriorated in reliability such as causing damage to the motor by eliminating the possibility of causing a short-circuit phenomenon.

The coil 21 is connected to the coil connecting piece 51A of the commutator thin film 51 at the time of rectification due to the operation of the commutator 50 because the rotating shaft 70C is fitted to the rotating shaft insulating cylinder 120C. The magnetic field generated in the armature core 22 or the magnetic field generated in the armature core 22 is prevented from leaking to the rotating shaft 70 to prevent the function of the commutator 50 from deteriorating and the magnetic field generated around the rotating shaft 70 inserted in the center of the commutator main body 50A It is possible to prevent the spark discharge from occurring and greatly improve the driving efficiency of the motor M. [

It is to be understood that the foregoing detailed description of the present invention has been presented for illustrative purposes only and is not intended to limit the scope of the present invention. It is intended that the scope of the invention be defined by the claims appended hereto, and that all such modifications and variations are intended to be included within the scope of the present invention.

10: cover assembly 10A: rotating shaft hole
10B: Support piece 10C: Cooling hole
20: Amateur assembly 21: Coil
22: Amateur Core 22A: Extreme
23, 24: upper and lower insulator 30: yoke assembly
31: magnetic pole 32: yoke cylinder
32A, 32B: projecting portion 32C ': space portion
32D: fit-in groove for ground connection 40: lower housing
50: commutator 50A: commutator body
50A ': insertion projection 51: commutator thin film
51A: coil connection latch piece 60: brush holder
61: Brush 61A: Brush case
61B: spring 62: support
62A: fitting projection 62A-1:
63: Connector seating portion 70:
80: Upper, lower, left, right vibration and noise reduction means
81, 82: upper and lower brackets 81A, 82A:
81C and 82C: recessed portions 81D and 82D:
81E, 82E: bearing housing cover 83, 84: buffer member
83A, 84A: fitting projections 83A ', 84A': engagement projections 83A '
90: Brush holder Left and right vibration and noise suppression
90A: Buffer member 90A-1:
90A ': Fitting recessed portion 90A'': Fitting space portion
100: Power supply connector 100-1: Main body
100-1 ': fastening piece 100-1'':
100-2: Power connector pin 100-3: Ground connector pin
100-2 ', 100-3': fitting projection connecting pieces 100-2 ", 100-3": fitting groove
100-3 '': Ground terminal 100-3 ''': Clamping jaw
110: Grounding means 120: Insulation means
121: insertion hole 120A: supporting disk
120B: insulated protruding piece 120C: rotating shaft insulated cylinder
130: blower fan 140, 150: upper and lower bearings
160: Choke coil

Claims (3)

A cover assembly (10);
A yoke assembly 30 having a lower housing 40 coupled to the cover assembly 10 and a plurality of magnetic poles 31 disposed within the cover assembly 10;
An armature core 22 having a plurality of extreme values 22A wound with coils 21 interacting with the magnetic pole 31 and upper and lower insulators 23 coupled to the upper and lower portions of the armature core 22, An armature assembly (20) including an armature (24);
A commutator 50 provided below the armature core 22 and having the same number of commutator thin films 51 corresponding to the exciting magnetic poles 31; And a brush holder (60) disposed inside the lower housing (40) and including a brush (61) selectively in contact with the commutator (50) as the armature assembly (20) rotates;
, ≪ / RTI >
The armature core 22 and the commutator 50 are configured so as to rotate together with the rotation shaft 70 sandwiched between the armature core 22 and the commutator 50,
A grounding connector pin 100-3 of the power supply connector 100 coupled to the connector seating portion 63 of the brush holder 60; A ground terminal 100-3 '' protruding from one side of the grounding connector pin 100-3 and a grounding coupling 100-3 '' of the yoke cylindrical body 32 engaged with the grounding terminal 100-3 ' And a grounding means (110) including a power supply connector (100) comprising a groove (32D).       The brushless motor according to claim 1, wherein the grounding means (110) including the power supply connector (100) comprises a brush (61B) mounted in the brush case (61A) of the cylindrical support (62) The brush holder 60 is configured such that the brush 61 is brought into contact with the thin film 51 so that electric current is supplied to the brush holder 60. In the brush holder 60 of the brush holder 60 of the support body 62, The engagement jaw 100-1 "of the engagement piece 100-1 'protruding from both ends of the main body 100-1 of the power supply connector 100 is inserted into the engagement hole 100A & And a fitting protrusion connecting piece 100-2 'protruding downward from each of the + power connector pin 100-2 and the grounding connector pin 100-3 inserted in the main body 100-1, ) 100-3 'is protruded downward from the bottom surface of the connector seating portion 63. The fitting recess 100-2 "of the fitting projection connecting piece 100-2', 100-3 ' And the choke coil 160 And the ground terminal 100-3 '' formed at one side of the grounding connector pin 100-3 is connected to the earth connection fitting groove 32D of the yoke cylindrical body 32 And a grounding structure of a DC motor for a vehicle.       The connector according to claim 2, wherein the ground terminal (100-3 '' ') protrudes above one side of the grounding connector pin (100-3), and a hooking jaw (100-3' '' (32D) of the body (32) to be connected to the grounding engagement groove (32D) of the body (32).

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