CN101272027A

CN101272027A - Electric power motor for steering apparatus and manufacturing method thereof

Info

Publication number: CN101272027A
Application number: CNA2007101526090A
Authority: CN
Inventors: 田中俊则; 山本京平; 冈崎正文; 山本雅祥
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2007-03-23
Filing date: 2007-09-19
Publication date: 2008-09-24
Anticipated expiration: 2027-09-19
Also published as: KR100915063B1; KR20080086806A; JP2008236979A; JP4333761B2; CN101272027B

Abstract

The invention provides a motor for an electromotor power steering device which enables heat generated near a brush body to efficiently transfer to a bracket in order to dramatically inhibit the raise of temperature neat the brush body, and a manufacturing method thereof. A sealing material (32) having electric insulating property and heat transfer property is clipped between the bracket (7) and a metal sheet (21) which is connected with a brush plait (24) guided out from the brush body (3) and structures an electric conducting part of the brush body (3). The sealing material (32) include fluidity while being coated and is hardened after a brush shelf pedestal (4) is fixed at the bracket (7). In addition, the sealing material (42) having electric insulating property and heat transfer property, which is composed by rubber material, is clipped between the bracket (7) and the metal sheet (21) and is pressed for fixation by the bracket (7) and the metal sheet (21).

Description

Electric power motor for steering apparatus and manufacture method thereof

Technical field

The present invention relates to be used to alleviate the electric power motor for steering apparatus and the manufacture method thereof of steering force of the steering gear of vehicle etc.

Background technology

In the driven steering device and since operation during steering gear to the motor energising so the burnup of vehicle etc. is increased, and adopt the bigger vehicle of discharge capacity etc. more and more along with the raising of nearest environmental protection policy.If the discharge capacity of vehicle more then electric power motor for steering apparatus desired output power can increase, the electric current of switching on to this motor also can increase, and the temperature that therefore must suppress motor rises, especially near the temperature of the brush body of this motor rises.Rise by near the temperature the inhibition brush body, can increase electrical current that feeds this motor or the miniaturization that realizes this motor.

Device in the past as near the exothermicity the raising brush body, a kind of being equipped with on the carriage of brush motor in order to the fixing brush holder pillar of brush holder arranged, and be folded with filler at this brush holder pillar and described tray chamber, make the device that near the exothermicity of the heat that produces the brush body improves.

Patent documentation 1: the Japan Patent spy opens 2005-45980 communique (paragraph [0011]-[0023], the 2nd figure)

In the device in the past, dispose brush body in the brush holder, brush holder pillar and described tray chamber this brush holder is fixing by riveted joint are folded with filler, the heat that brush body produced is passed to bracket side from brush holder to the brush holder pillar and by filler heat, therefore the effective underground heat of heat that brush body is produced is passed to bracket side, thereby near the temperature that can't reduce effectively the brush body rises.

Brush body leaves small gap and is adapted to slidably in brush holder, it is limited therefore the heat that brush body produced being passed to brush holder from the effective underground heat of brush body.

In addition, in the device that brush holder and/or brush holder pillar are made of resin material, it is insufficient that resin material transmits heat, thereby can't make the effective underground heat of heat of generation such as brush body be passed to bracket side.

Summary of the invention

For addressing the above problem, the objective of the invention is to, provide near a kind of effective underground heat of heat that produces the brush body that makes to be passed to bracket side, and can reduce electric power motor for steering apparatus and manufacture method thereof that near the temperature the brush body rises effectively.

In the electric power motor for steering apparatus of the present invention, have sheet metal, this sheet metal is connected with the brush pigtail of deriving from brush body and constitutes conductive part to this brush body, and this sheet metal and tray chamber are folded with the encapsulant with electrical insulating property and heat transmitting.

The manufacture method of electric power motor for steering apparatus of the present invention comprises: to be connected with the brush pigtail of deriving from brush body and to constitute that sheet metal to the conductive part of this brush body is folded with the encapsulant with electrical insulating property and heat transmitting with tray chamber and the described encapsulant that will have a flowability is applied to the operation on described sheet metal and/or the described carriage in order to make; Before coated described sealing material curing, described brush holder pedestal is fixed in the operation of described carriage; And the operation that after described brush holder pedestal is fixed in described carriage, makes described sealing material curing.

The manufacture method of electric power motor for steering apparatus of the present invention comprises: in order to make to be connected with the brush pigtail of deriving from brush body and to constitute the sheet metal of the conductive part of this brush body and tray chamber to be folded with the encapsulant that is formed by elastomeric material with electrical insulating property and heat transmitting and to set the operation of described encapsulant at described sheet metal and/or described carriage; And make described encapsulant in compression of described sheet metal and described tray chamber and fixing operation by described brush holder pedestal being fixed in described carriage.

If use the present invention, can obtain near a kind of effective underground heat of heat that produces the brush body that makes and be passed to bracket side, and can reduce electric power motor for steering apparatus and manufacture method thereof that near the temperature the brush body rises effectively.

Description of drawings

Fig. 1 is the cutaway view of the electric power motor for steering apparatus of expression embodiment of the present invention 1.

Fig. 2 is the front view of the brush holder pedestal of expression embodiment of the present invention 1.

Fig. 3 is the upward view of the brush holder pedestal of expression embodiment of the present invention 1.

Fig. 4 is the front view of the sheet metal of expression embodiment of the present invention 1.

Fig. 5 is the front view of the carriage of expression embodiment of the present invention 1.

Fig. 6 is the cutaway view of the electric power motor for steering apparatus of expression embodiment of the present invention 2.

Fig. 7 is the front view of the carriage of expression embodiment of the present invention 2.

(symbol description)

1 electric power motor for steering apparatus, 2 armatures

3 brush bodies, 4 brush holder pedestals

5 magnetic poles, 7 carriages

21 sheet metals, 23 brush holders

24 brush pigtails, 26 exposed divisions

27 exposed divisions 30 the 1st protrusion

31 the 2nd protrusions, 32 encapsulants

35 spaces, 42 encapsulants

46 encapsulants

Embodiment

Execution mode 1

According to Fig. 1～Fig. 5 execution mode 1 is described.In addition, identical among each figure or considerable part mark prosign are described.Fig. 1 is the cutaway view of electric power motor for steering apparatus, and Fig. 2 is the front view of the brush holder pedestal (brush body is installed preceding) of the electric power motor for steering apparatus of Fig. 1.Fig. 3 is the upward view from the brush holder pedestal of the inboard Fig. 2 of observation of paper.Fig. 4 is a front view of being inlayed the sheet metal of casting mold on the brush holder pedestal, and Fig. 5 is the front view that is fixed with the carriage of brush holder pedestal.

Among Fig. 1, electric power motor for steering apparatus 1 comprises: as the armature 2 of rotor; Brush holder pedestal 4 to the brush body 3 of armature 2 power supplies is installed; Be fixed with the iron yoke 6 of the magnetic pole 5 that constitutes by permanent magnet; Make brush holder pedestal 4 fixing and with the chimeric and fixing carriage 7 of the peristome of iron yoke 6; And the torque limiter 10 of axle on 9 etc. that is fixed on armature 2, this torque limiter 10 has the hub portion 8 that the steering gear side with vehicle links.

In the armature 2, laminate core 11, commutator 12 are pressed into and are fixed on the axle 9, are wound with armature coil 13 in the lap wound mode on the laminate core 11, and armature coil 13 is connected with commutator 12.Rotatably supported by bearing 14 and 15 near the two ends of axle 9.

Steel plate is carried out on the inner peripheral surface of the formed iron yoke 6 of pressure processing, the magnetic pole 5 of 4 utmost points that are made of each permanent magnet of 2 of the N utmost point S utmost point is pressed into fixing with magnet frame 16, constitute stator by this magnetic pole 5 and magnet frame 16.

Roughly have the carriage 7 of round-ended cylinder shape to be fixed with the foreign steamer of bearing 15, and it near being arranged, inner face bottom of round-ended cylinder shape utilize 2 rigging screws 17 to be fixed with brush holder pedestal 4.In addition, carriage 7 is chimeric with the peristome of iron yoke 6, and is fixing by 2 rigging screws 18.

The lead 19 that is connected with control device that driven steering device is used runs through grommets 20 and is connected with brush holder pedestal 4, and is connected with brush body 3 with to its power supply, and this brush body 3 has positive and negative each 2 to add up to 4.

Fig. 2 is the front view from the observed configuration brush body 3 of iron yoke side (opposition side of carriage) brush holder pedestal 4 before.In the brush holder pedestal 4, covered and produced by insert molding by the resin material that PPS etc. has electrical insulating property as the sheet metal shown in Figure 4 21 of the conductive part of brush body 3, brush holder pedestal 4 is made of the frame pedestal 22 that is fixed with sheet metal 21, the brush body 3 etc. that is fixed in the brush holder 23 of this pedestal 22 and is accommodated in this brush holder 23 by riveted joint etc.

Brush holder 23 constitutes by making metal plate shape such as brass sheet become the case shape, has wherein taken in brush body 3, and brush body 3 is pushed by the direction of spring 29 to commutator 12, and slips with the surface of commutator 12.Brush holder 23 is by constituting with the parts 23a of 2 opposing L word shapes of brush body 3 and with these 2 parts of parts 23b of 3 relative コ word shapes of brush body 3.

The part of frame pedestal 22 has and exposes brush pigtail connecting portion P1～P4 of 4 places sheet metal 21 surfaces, circular that is panelized into shape and the 2 wire interconnecting piece R1 of place, the R2 that is connected with lead 19 as shown in Figure 2.Brush pigtail connecting portion P1～P4 is connected with brush pigtail 24 respectively, and this brush pigtail 24 constitutes from 3 derivation of 4 brush bodies and by the twisted wire of copper cash respectively, and wire interconnecting piece R1, R2 are connected with the end of positive and negative lead 19 respectively.

In addition, frame pedestal 22 has installing hole 25, and this installing hole 25 is formed as one by resin material, and can insert to be common to brush holder pedestal 4 is installed in rigging screw 17 on the carriage 7.

Fig. 3 is a view of observing the brush holder pedestal 4 of Fig. 2 from bracket side (opposition side of iron yoke).On the corresponding position of the brush pigtail connecting portion P1～P4 part of frame pedestal 22 and Fig. 2 and wire interconnecting piece R1, R2, has the exposed

division

26 and 27 that expose on the surface of the opposition side that makes the sheet metal 21 that is panelized into shape.

The caulking part 28 that forms as one with brush holder 23 (23b) runs through frame pedestal 22, and as shown in Figure 3, this caulking part 28 makes brush holder 23 riveted and fixed in brush holder pedestal 4 in the bracket side bending of brush holder pedestal 4.

Having the 1st protrusion 30 that the described resin material with frame pedestal 22 forms as one and the 2nd protrusion 31, the 1 protrusions 30 and the 2nd protrusion 31 on the brush holder pedestal 4 is formed on brush holder pedestal 4 face relative with the inner face of carriage 7.

The 1st protrusion 30 surrounds forming of 2 place's exposed

divisions

26 and 2 place's caulking parts 28 on every side as shown in Figure 3,2 places about the scope that the 1st protrusion 30 is surrounded among Fig. 3 forms in the drawings.The height of the 1st protrusion 30 forms the gap size that makes the 1st protrusion 30 and carriage 7 gap size less than itself and exposed division 26 and caulking part 28, is coated with encapsulant 32 in the scope that the 1st protrusion 30 is surrounded (the oblique line portion at 2 places about among the figure).

Fig. 4 is the front view of sheet metal 21, carries out stamping-out by the sheet material to steel alloy etc. and processes and form.Sheet metal 21 is made of 2 parts, and parts have brush pigtail connecting portion P1, P3 and wire interconnecting piece R2, another parts have brush pigtail connecting portion P2, P4 and wire interconnecting piece R1.2 brush bodies 3 brush pigtail 24 separately of homopolarity is connected with the brush pigtail connecting portion of same sheet metal 21 respectively.Sheet metal 21 constitutes from the wire interconnecting piece R1 that is connected with lead 19 or R2 respectively to the conductive part of brush body 3 conductions of homopolarity.

In addition, the exposed division 26 among Fig. 3 is equivalent to the face of the dorsal part of brush pigtail connecting portion P1～P4 shown in Figure 4, and the exposed division 27 among Fig. 3 is equivalent to wire interconnecting piece R1 shown in Figure 4, the face of R2 dorsal part, and this part is exposed from resin material among Fig. 3.

Sheet metal 21 is processed and is formed by sheet material being carried out stamping-out, form on 2 sheet metal 21 same planes in the axial direction, what yet the position of 2 sheet metals 21 had dislocation by the resin material produced by insert molding of frame pedestal 22 time may, therefore carry out stamping-out processing with the shape that is provided with the coupling part that connects 21 of 2 sheet metals, behind produced by insert molding, make it be separated into 2 sheet metals 21 this coupling part cut-out, thereby can prevent the dislocation of 2 sheet metals 21 reliably.Consider this point, the shape of sheet metal shown in Figure 4 has been represented the shape of the sheet metal 21 after behind the produced by insert molding described coupling part being cut off.

Fig. 5 is the front view of carriage 7, and brush holder pedestal 4 shown in Figure 2 is inserted carriage 7 downwards from the paper top of Fig. 5.Tighten rigging screw 17 at the screw part 33 that is arranged at carriage 7, thereby brush holder pedestal 4 is fixed in the inner face of carriage 7.In addition, tightened screw 18 at the screw part 34 that is arranged at carriage 7, thereby iron yoke 6 has been fixed in carriage 7.

Among Fig. 1～Fig. 5, will have electrical insulating property and heat conductivity and in (about the 2 places) coating in the scope of the oblique line portion that the 1st protrusion 30 of Fig. 3 is surrounded of the encapsulant 32 of flowability that coating the time has an appropriateness.

Sealing material 32 belongs to single composition room temperature vulcanizing type, is to comprise silicon based material, low molecular weight polyorganosiloxane to be reduced to the aqueous silica gel that 0.03wt% is following and have viscosity, can keep caoutchouc elasticity and viscosity in wider temperature range.Oil can not take place as lubricating grease yet to be separated.For example, use the encapsulant 32 with following parameter, heet transfer rate is 0.8 (W/mK), specific insulation is 4000000 (M Ω m), viscosity (23 ℃) is 60 (Pas) before the sclerosis, and sclerosis back hardness (type A) is 63, and low molecular weight polyorganosiloxane is 0.025 (wt%).

When coating encapsulant 32, the exposed division 26 of the sheet metal 21 that the scope that encapsulant 32 and the 1st protrusion 30 are surrounded is interior and the caulking part 28 of brush holder 23 contact, and are higher than the protuberance of appropriateness to heavens of the 1st protrusion 30.

Next, before coated ground encapsulant 32 at room temperature is hardened to rubber-like, the brush holder pedestal 4 that is coated with encapsulant 32 is assembled in the inner face of carriage 7, and utilizes rigging screw 17 to be fixed in carriage 7.

Shown in the oblique line portion of Fig. 1, exposed division 26 in the 1st protrusion 30 and carriage 7 formed spatial portions relative with the

1st protrusion

30 and 7 on carriage and caulking

part

28 and 7 on carriage are full of under the state of presclerotic seal member 32, utilize rigging screw 17 that brush holder pedestal 4 is fixed in carriage 7.

Then, coated encapsulant 32 at room temperature is hardened to rubber-like with the state of 28 of the caulking parts of 26 of exposed divisions being close to carriage 7 and sheet metal 21 and carriage 7 and brush holder 23.

As shown in Figure 1, be formed with space 35 between the inner peripheral surface of the outer peripheral face of armature 2 and magnetic pole 5, the coating part of the encapsulant 32 in being coated in the scope that the 1st protrusion 30 surrounded has the 1st protrusion 30 and the 2nd protrusion 31 that are formed at brush holder pedestal 4 to the way in the path in space.The gap size g1 of the

1st protrusion

30 and 7 on relative vertically carriage is less than the void size ga in space 35 (g1＜ga).

The gap size g2 of the

2nd protrusion

31 and 7 on radially relative carriage is also less than void size ga (g2＜ga=.

Next, the action to the execution mode 1 that adopts this structure describes.Has control device, this control device is controlled electric power motor for steering apparatus 1 according to signals such as the signal of the steering square transducer of the steering gear side that is arranged at vehicle and the speed of a motor vehicle, the lead 19 that is connected with this control device is connected with the sheet metal 21 that is fixed in brush holder pedestal 4, power to brush body 3 by the brush pigtail 24 that is connected with sheet metal 21, and switch on to armature coil 13 from slipping the commutator 12 that brush body 3 is arranged.Armature that utilization is energized 2 makes axle 9 rotations with the electromagnetic action of magnetic pole 5, and its revolving force is passed to the steering gear side by hub portion 8, with the steering force of the steering wheel of service vehicle, thereby alleviates driver's steering force.

This electric power motor for steering apparatus 1 belongs to earth float type (earth float type), wherein brush body 3 and brush holder pedestal 4 and carriage 7 and iron yoke 6 electric insulations, can make the positive and negative reverse of lead 19 according to the steering direction of steering gear, thereby make the contrary rotation of direction of rotation of axle 9.

In addition, make the electric current that feeds electric power motor for steering apparatus 1 big as much as possible, further to alleviate driver's steering force, thereby applicable to more large-scale vehicle etc., and in fact, in order to limit near the temperature rising brush body 3 etc., sometimes must restriction to the electric current of motor energising or restriction to time of motor energising etc., near temperature that hope can reduce this brush body 3 rise.

As implied above, in the electric power motor for steering apparatus 1 of execution mode 1, comprising: brush body 3; Take in the brush holder 23 of brush body 3; Be connected with the brush pigtail 24 of deriving from brush body 3 and constitute sheet metal 21 conductive part of brush body 3; Be fixed with the brush holder pedestal 4 of brush holder 23 and sheet metal 21; And the carriage 7 that is fixed with brush holder pedestal 4, because

sheet metal

21 and 7 on carriage are folded with the encapsulant 32 with electrical insulating property and heat transmitting, therefore can be not ground such as resin material by frame pedestal 22 heat that brush body 3 is produced and constitute heat that the sheet metal 21 to the conductive part of brush body 3 produces etc. effectively underground heat be passed to carriage 7 sides, thereby near the temperature that reduce effectively the brush body 3 rise.

The brush pigtail 24 of deriving from brush body 3 is connected with the sheet metal 21 that is formed by the sheet material of copper alloy etc. etc., the heat that the heat of brush body 3 generations and brush pigtail 24 produce is passed to sheet metal 21 by brush pigtail 24 by effective underground heat, and be passed to carriage 7 by seal member 32 by heat from this sheet metal 21, thereby near the temperature that reduces effectively the brush body rises.

Seal member 32 has electrical insulating property, for example, can guarantee as the sheet metal 21 of conductive part and as the electrical insulating property between the carriage 7 of shell.

In the brush holder pedestal 4, utilization has the resin material of electrical insulating property with sheet metal 21 produced by insert molding, has the exposed division 26 that the part that makes sheet metal 21 is exposed from described resin material, 7 on exposed division 26 and carriage are folded with encapsulant 32, therefore can make heat pass through encapsulant 32 effective geothermal transfer carriages 7, and can suppress the temperature rising of the resin material of frame pedestal 22 from exposed division 26.

Utilization has the resin material of electrical insulating property with sheet metal 21 produced by insert molding, not only can guarantee the electrical insulating property of 21 of sheet metals, also can guarantee the electrical insulating property of brush holder pedestal 4 and carriage 7.

Sheet metal 21 comprises a plurality of, and a plurality of brush bodies 3 its brush pigtails 24 of homopolarity are connected with same sheet metal 21, therefore can increase the thermal capacity of sheet metal 21, and can suppress the error of a plurality of brush bodies 3 temperature each other, thereby realize the reduction of brush body temperature effectively.

In addition, a plurality of sheet metals 21 do not intersect each other vertically, stamping-out processing by sheet material forms simultaneously so productivity is good, the event axial dimension is less at grade because of setting, and the gap size of 7 on each sheet metal 21 and relative vertically carriage is equated, therefore can realize the homogenizing of transmitting to the heat of carriage 7 from a plurality of sheet metals 21.

Encapsulant 32 has flowability when being applied to sheet metal 21, brush holder pedestal 4 being fixed in carriage 7 after-hardening is rubber-like, therefore when brush holder pedestal 4 is fixed in carriage 7, encapsulant 32 flows at

carriage

7 and 21 of sheet metals, therefore brush holder pedestal 4 can not be fixed in carriage 7 obliquely because of encapsulant 32, in addition, encapsulant 32 is being fixed in brush holder pedestal 4 carriage 7 after-hardening, therefore harden under the state of all being close to carriage 7 and sheet metal 21 at

carriage

7 and 21 mobile encapsulants 32 of sheet metal in the time of can making fixedly, thereby do not produce gap etc., thereby can improve heat transmitting.

If use the encapsulant 32 that when brush holder pedestal 4 is fixed in carriage 7, has just hardened, then brush holder pedestal 4 will be fixed in carriage 7 obliquely when encapsulant 32 is applied with the protuberance state, perhaps the amount of the encapsulant 32 of coating more after a little while

carriage

7 and 21 of sheet metals can produce the gap, thereby can't carry out the heat transmission effectively.

In addition, in the present embodiment, the situation that encapsulant 32 is applied to sheet metal 21 has been described, however encapsulant 32 is applied to carriage 7 or be applied to sheet metal 21 and carriage 7 both the time, also can obtain same effect.

In addition, because encapsulant 32 is made of the encapsulant of single composition room temperature vulcanizing type, therefore can react with airborne moisture (moisture) and harden, thereby after brush holder pedestal 4 is fixed in carriage 7, need not to heat to wait and make its sclerosis, thereby improved productivity.Therefore encapsulant 32 is located between carriage 7 and the sheet metal 21, can also suppress moving of presclerotic encapsulant 32, especially can be suppressed at moving of coating ground encapsulant 32 in the scope that the 1st protrusion 30 surrounded.

Encapsulant 32 comprises the silicon based material, and low molecular weight polyorganosiloxane is reduced to below the 0.03wt%, therefore can prevent that not only commutator 12 employed copper from being corrosion of metal, also can prevent the corrosion etc. of metal part of the inside of electric power motor for steering apparatus 1.

Be formed with the 1st protrusion 30 on the face relative of brush holder pedestal 4 with carriage 7, in the scope that the 1st protrusion 30 is surrounded, be equipped with encapsulant 32, therefore the coating scope of encapsulant 32 is clear and definite, make that the management of coating amount is easy, thereby the operation when improving encapsulant 32 coatings, and when brush holder pedestal 4 is fixed in carriage 7, encapsulant 32 is flowed in the space that scope that the 1st protrusion 30 is surrounded and carriage 7 form, thereby the pith such as 28 of caulking parts of being close to 21 of carriage 7 and sheet metals and carriage 7 and brush holder 23, thereby do not produce gap etc., make heat transmitting improve.

The way in the armature 2 from the 1st protrusion 30 that is equipped with encapsulant 32 to this motor and the path in the spaces 35 of magnetic pole institute 5 formation, be formed with the 2nd protrusion 31 on the relative face of brush holder pedestal 4 and carriage 7, even therefore have encapsulant 32 to spill from the 1st protrusion 30, because of being formed with the 2nd protrusion 31, can prevent that the encapsulant 32 that spills from arriving space 32, thereby can improve the reliability of electric power motor for steering apparatus 1.

The 1st protrusion 30 and/or the 2nd protrusion 31 are below the void size ga of this motor with the gap size g1 and/or the g2 of 7 on the carriage relative with this protrusion, therefore, even the fragments of encapsulant 32 etc. are just in case arrive space 35, because of g1＜ga and/or g2＜ga, the fragment of encapsulant 32 etc. also can not hinder the rotation of armature 2, thereby can improve the reliability of electric power motor for steering apparatus 1.

Brush holder 23 is formed by metallic plate, 7 on brush holder 23 and carriage are folded with the encapsulant 32 with electrical insulating property and heat transmitting, therefore the heat of carriage 3 also can be passed to carriage 7 via encapsulant 32 heat from brush holder 23 sides, thereby near the temperature that reduces effectively the brush body rises.In the present embodiment, represented that heat is passed to the situation of carriage 7 via encapsulant 32 heat from the caulking part 28 of brush holder 23 (23b).

Encapsulant 32 is made of the encapsulant 32 with viscosity, therefore, the sealed each other materials 32 of pith such as 28 of the caulking parts of 21 of carriage 7 and sheet metals and carriage 7 and brush holder 23 are bonded as one, thereby do not produce gap etc., thereby heat transmitting is improved.In addition,, rigidity is increased, also can reduce the noise of brush body 3 grades owing to be bonded as one.

The electric power motor for steering apparatus 1 of present embodiment comprises: brush body 3; Take in the brush holder 23 of brush body 3; Be connected with the brush pigtail 24 of deriving from brush body 3 and as the sheet metal 21 of the conductive part of brush body 3; Be fixed with the brush holder pedestal 4 of brush holder 23 and sheet metal 21; And the carriage 7 that is fixed with brush holder pedestal 4, its manufacture method comprises: will have mobile encapsulant 32 for the encapsulant 32 that 7 on sheet metal 21 and carriage is folded with have electrical insulating property and heat transmitting and be applied to operation on sheet metal 21 and/or the carriage 7; Before 32 sclerosis of coated encapsulant, brush holder pedestal 4 is fixed in the operation of carriage 7; And the operation that after brush holder pedestal 4 is fixed in carriage 7, makes encapsulant 32 sclerosis, therefore, when brush holder pedestal 4 is fixed in carriage 7, encapsulant 32 flows at carriage 7 and 21 of sheet metals, so brush holder pedestal 4 can not be fixed in carriage 7 obliquely because of encapsulant 32, in addition, encapsulant 32 is being fixed in brush holder pedestal 4 carriage 7 after-hardening, therefore harden under the state of all being close to carriage 7 and sheet metal 21 at carriage 7 and 21 mobile encapsulants 32 of sheet metal in the time of can making fixedly, thereby do not produce gap etc., thereby can improve heat transmitting, and obtain the good manufacture method of a kind of productivity.

Execution mode 2

According to Fig. 6 and Fig. 7 execution mode 2 is described.In addition, to the part mark prosign identical or suitable and omit explanation with execution mode 1.Fig. 6 is the cutaway view of electric power motor for steering apparatus, and Fig. 7 is the front view of carriage that is fixed with the brush holder pedestal of Fig. 6

In the

execution mode

1,7 on sheet metal 21 and carriage are folded with in coating the time to have flowability and is elastomeric encapsulant 32 brush holder pedestal 4 being fixed in carriage 7 after-hardening, and in present embodiment 2, encapsulant 42 is formed by the such rubber-like elastomeric material of silicon based material (silicone rubber etc.) with electrical insulating property and heat transmitting, sealing material 42 is compressed at the exposed

division

26 and 7 on the carriage of sheet metal 21, thereby sets with being close to sheet metal 21 and carriage 7 these both.

After in the recess 43 that is arranged at carriage 7, setting encapsulant 42, utilize rigging screw 17 that brush holder pedestal 4 is fixed in carriage 7, thus make encapsulant 42

sheet metal

21 and 7 on carriage be compressed and be close to these both be fixed.

Have on the frame pedestal 22 to the side-prominent protuberance 44 of carriage 7, this protuberance 44 is formed as one by the resin material of frame pedestal 22, the hole portion 45 that is provided with the chimeric encapsulant 42 of the inner peripheral surface of recess 43, make the outer peripheral face and the hole portion 45 of this protuberance 44 chimeric, thereby the center (axle center) that makes brush holder pedestal 4 as one man positions with the axle center of the axle 9 that is equipped on carriage 7, therefore, 4 brush bodies 3 that are equipped on brush holder pedestal 4 are slided to pushing ground, axle center respectively, therefore can also reduce the noise of brush body 3.

In addition, encapsulant 42 also can be fixed brush holder pedestal 4 being equipped on brush holder pedestal 4 rear flank in carriage 7 sides, in addition, also can fix behind the both sides that are equipped on brush holder pedestal 4 sides and carriage 7.In addition, with face that sheet metal 21 and carriage 7 etc. contacts on also can adopt adhesive to be used as encapsulant 42 etc.

In addition, be equipped with encapsulant 46 near rigging screw 17, sealing material 46 makes brush holder pedestal 4 by carriage 7 resiliency supported (rubber mount), and realizes from the heat transmission to carriage 7 of the exposed division 27 of sheet metal 21.Be equipped with the axle sleeve 47 of metal tubulose in the internal diameter of encapsulant 46, brush holder pedestal 4 is fixed in carriage 7 by encapsulant 46.Encapsulant 46 is formed by the elastomeric material identical with encapsulant 42.

After setting encapsulant 46, axle sleeve 47 on the brush holder pedestal 4, utilize rigging screw 17 to be fixed in the screw part 33 of carriage 7 this brush holder pedestal 4, thereby make encapsulant 46 at

sheet metal

21 and 7 on carriage is compressed and fixing, and make brush holder pedestal 4 sealed material 46 resiliency supported.At this moment, encapsulant 42 also is fixed simultaneously.

Brush holder pedestal 4, therefore can be reduced the noise of brush body 3 etc., and utilize sealing material 46 also can to carriage 7 heat transmission be taken place from sheet metal 21 by carriage 7 resiliency supported by encapsulant 46.

The caulking part 28 of brush holder 23 (23b) by riveted and fixed in the sheet metal 21 of brush holder 23 homopolarities, this sheet metal 21 is fixed in brush holder pedestal 4, brush holder 23 directly contacts with the sheet metal 21 of homopolarity and is fixing.

7 on 7 on brush holder 23 and carriage and sheet metal 21 and carriage are folded with encapsulant 42 closely.

The relative part of the inner peripheral surface with carriage 7 as the part of the resin material of frame pedestal 22 has notch part 48 on the position relative with the position of 4 brush holders 23 (23a), encapsulant 49 sets at

brush holder

23 and 7 on carriage by notch part 48 with being compressed.

Encapsulant 49 is formed by the elastomeric material identical with encapsulant 42, encapsulant 46, can realize from the heat transmission of brush holder 23 to carriage 7, yet utilize sealing material 49 also can suppress the vibration of brush holder 23, also can reduce noise.

From notch part 48 to the space the way in 35 path, the resin material that has with frame pedestal 22 forms as one and the 2nd radially outstanding protrusion 31.

As mentioned above, in the device of execution mode 2, be folded with encapsulant at

sheet metal

21 and 7 on carriage with electrical insulating property and heat conductivity, therefore can be not by frame pedestal 22 ground such as resin material with brush body 3, brush pigtail 24, and the heat that produces of sheet metal 21 etc. effectively underground heat be passed to carriage 7 sides, thereby near the temperature that reduce effectively the brush body 3 rise.

Because exposed

division

26,27 and 7 on carriage are folded with

encapsulant

42,46, therefore can make heat be passed to carriage 7 by

encapsulant

42,46 effective underground heat from sheet metal 21.

Because encapsulant 46 is formed by elastomeric material, so can carry out resiliency supported to brush holder pedestal 4, also can realize brushing the reduction of sound simultaneously 17 ones of rigging screws.

Encapsulant

42,46 is formed by elastomeric material, makes

encapsulant

42,46 be folded in 7 on sheet metal 21 and carriage with being compressed, therefore can utilize the elasticity of rubber to make

encapsulant

42,46 be close to sheet metal 21 and carriage 7 etc., thereby carry out heat transmission effectively.

Because

encapsulant

42,46 is formed by elastomeric material, so can realize the resiliency supported of brush holder pedestal 4 etc., and can realize brushing the reduction of sound etc.

Because brush holder 23 contact with the sheet metal 21 that is fixed in brush holder pedestal 4 and be fixing, therefore can make brush holder 23 the heat transmission also take place, thereby more effectively reduce near the temperature rising of brush body to sheet metal 21.

Owing to compress and be folded with encapsulant 49 at brush holder 23 (23a) and 7 of brush holders, so can improve from the heet transfer rate of brush holder 23 to brush holder 7.

Owing to have after setting encapsulant 42 and/or encapsulant 46 on sheet metal 21 and/or the carriage 7, make encapsulant 42 and/or encapsulant 46 at

sheet metal

21 and 7 on carriage is compressed and fixing operation by brush holder pedestal 4 being fixed in carriage 7, therefore can make heat be passed to carriage 7, and obtain the good manufacture method of a kind of productivity from sheet metal 21 effective underground heat.

In addition, the part identical with execution mode 1 plays the effect identical with execution mode 1 certainly.

In addition, in the above-mentioned execution mode, the example that sheet metal 21 is carried out produced by insert molding has been described, yet also sheet metal 21 can be waited the bracket side that is fixed in brush holder pedestal 4 by riveted joint, in addition, about the shape of sheet metal 21 and exposed division 26 etc., area, position etc., can in the scope that does not break away from purport of the present invention, suitably change certainly.

Claims

1, a kind of electric power motor for steering apparatus comprises:

Brush body;

Take in the brush holder of this brush body;

Be connected with the brush pigtail of deriving from described brush body and constitute sheet metal to the conductive part of described brush body conduction;

Be fixed with the brush holder pedestal of described brush holder and described sheet metal; And

Be fixed with the carriage of this brush holder pedestal, it is characterized in that,

Described sheet metal and described tray chamber are folded with the encapsulant with electrical insulating property and heat transmitting.

2, electric power motor for steering apparatus as claimed in claim 1, it is characterized in that, the utilization of brush holder pedestal has the resin material of electrical insulating property with the sheet metal produced by insert molding, and have the exposed division that the part that makes this sheet metal is exposed from described resin material, this exposed division and tray chamber are folded with encapsulant.

3, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, sheet metal comprises a plurality of, and the brush pigtail of a plurality of brush bodies of homopolarity is connected with same sheet metal.

4, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, encapsulant has flowability when being applied to sheet metal and/or carriage, is rubber-like the brush holder pedestal being fixed in described carriage after-hardening.

5, electric power motor for steering apparatus as claimed in claim 4 is characterized in that, encapsulant is made of the encapsulant of single composition room temperature vulcanizing type.

6, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, encapsulant is formed by elastomeric material, makes the sealing material be folded in sheet metal and tray chamber with being compressed.

7, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, brush holder is formed by metallic plate, and this brush holder contacts with the sheet metal that is fixed in the brush holder pedestal and be fixing.

8, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, encapsulant comprises the silicon based material and the encapsulant that is reduced to below the 0.03wt% by low molecular weight polyorganosiloxane constitutes.

9, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, is formed with the 1st protrusion on the face relative with carriage of brush holder pedestal, is equipped with encapsulant in the scope that the 1st protrusion is surrounded.

10, electric power motor for steering apparatus as claimed in claim 9, it is characterized in that, the way from the 1st protrusion that is equipped with encapsulant to this motor, on the face relative of brush holder pedestal, be formed with the 2nd protrusion with carriage with the path in armature and the formed space of magnetic pole.

11, electric power motor for steering apparatus as claimed in claim 10 is characterized in that, the gap size of the 1st protrusion and/or the 2nd protrusion and the tray chamber relative with this protrusion is below the void size of this motor.

12, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, brush holder is formed by metallic plate, is folded with the encapsulant with electrical insulating property and heat transmitting at this brush holder and tray chamber.

13, electric power motor for steering apparatus as claimed in claim 1 or 2 is characterized in that, encapsulant is made of the encapsulant with viscosity.

14, a kind of manufacture method of electric power motor for steering apparatus, this electric power motor for steering apparatus comprises:

Brush body;

Take in the brush holder of this brush body;

Be fixed with the carriage of this brush holder pedestal, this manufacture method is characterised in that, comprising:

To have mobile described encapsulant in order to establish encapsulant and be applied to operation on described sheet metal and/or the described carriage with electrical insulating property and heat transmitting at described sheet metal and described tray chamber folder;

Before coated described sealing material curing, described brush holder pedestal is fixed in the operation of described carriage; And

After being fixed in described carriage, described brush holder pedestal makes the operation of described sealing material curing.

15, a kind of manufacture method of electric power motor for steering apparatus, this electric power motor for steering apparatus comprises:

Brush body;

Take in the brush holder of this brush body;

Be connected with the brush pigtail of deriving from described brush body and as sheet metal to the conductive part of described brush body conduction;

The operation that on described sheet metal and/or described carriage, sets described encapsulant in order to establish the encapsulant that forms by elastomeric material at described sheet metal and described tray chamber folder with electrical insulating property and heat transmitting; And

Make described encapsulant at described sheet metal and described tray chamber is compressed and fixing operation by described brush holder pedestal being fixed in described carriage.