CN1090834C

CN1090834C - AC. generator for vehicle

Info

Publication number: CN1090834C
Application number: CN99101822A
Authority: CN
Inventors: 浅尾淑人
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1999-01-28
Filing date: 1999-01-28
Publication date: 2002-09-11
Anticipated expiration: 2019-01-28
Also published as: CN1264204A

Abstract

The present invention relates to an AC. generator for vehicles. The front support frame of the present invention is in a bowl-shaped structure, a bearing containing part, four penetrating screw bolt parts arranged on the same circumference in equal space, and four rib parts for respectively connecting the bearing containing part and each penetrating screw bolt part are used as a main frame, air suction holes are arranged among the rib parts, and air discharging holes are arranged among the penetrating screw bolt parts. In addition, the total number of the air suction holes is different from the total number (12) of unguiform magnetic poles and is 14, and one side of each rib part, which is adjacent to the penetrating screw bolt parts, is provided with the air discharging holes. The present invention can reduce the friction air sound with the same frequency times as the total number of the unguiform magnetic poles, and has the advantages of total sound level reduction and jarring feeling elimination.

Description

Vehicle-mounted dlternator

Technical field

The present invention relates to have the vehicle-mounted dlternator of your (ラ Application De Le) formula rotor of the Landor that is installed on the vehicle motor, relate in particular to the front rack structure of the vehicle-mounted dlternator of the high reps composition antitriptic wind sound that the rotation that can suppress rotor causes.

Background technology

Fig. 3 sees the front view of conventional truck with alternating current generator from the front side, Fig. 4 is the cutaway view along IV-IV line among Fig. 3.Omitted belt pulley among Fig. 3.

Your formula rotor 7 of the Landor of traditional vehicle-mounted dlternator rotates through rotating shaft 6 and is installed in freely in the housing that is made of aluminum front rack 1 and tail-bracket 2, and stator 8 is fixed on the housing with the state that covers rotor 7 peripheries.

Front rack 1 is a bowl structure, with the bearing accommodation section 30 that is arranged on central portion, with etc. angular separation be arranged on the bolt part 31 of 4 perforations on the same circumference and be main skeleton with 4 flanks 32 that each in-and-out bolt portion 31 is connected respectively bearing

accommodation section

30,3 suction hole 1a along the circumferential direction respectively are set respectively between each flank 32, and a plurality of steam vent 1b along the circumferential direction are set between each in-and-out bolt portion 31.In addition, tail-bracket 2 also is a bowl structure, have the bearing accommodation section 33 that is located at central portion and with etc. angular separation be arranged on 4 in-and-out bolt portions 34 on the same circumference, periphery in bearing accommodation section 33 is provided with a plurality of suction hole 2a, and between each in-and-out bolt portion 34 a plurality of steam vent 2b is set along the circumferential direction.The in-and-out bolt 35 that will pass the in-and-out bolt portion 31 on the front rack 1 again is anchored on the in-and-out bolt portion 34 on the tail-bracket 2, thereby forms an integral body.

Rotating shaft 6 is rotated supporting freely by the bearing 3 and 4 that is contained in the bearing

accommodation section

30 and 33 on front rack 1 and the tail-bracket 2.End at this rotating shaft 6 is being fixed belt pulley 5, the torque of engine can be passed to rotating shaft 6 by belt (not shown).

Be fixed on the other end of rotating shaft 6 to the collecting ring 9 of rotor 7 supplying electric currents, brush 10 is contained in the brush carrier 11 that is located in the housing with the state with these collecting ring 9 sliding contacts.Bonding to the voltage regulator 18 that the size of the alternating voltage that produces with stator 8 is regulated with the radiator 17 that is embedded on the brush carrier 11.Be electrically connected with stator 8 and be that the rectifier 12 of direct current is loaded in the housing the AC rectification that stator 8 produces.

Rotor 7 produces the rotor coil 19 of magnetic flux behind the electric current and covers this rotor coil 19 and constitute by a pair of

field core

20 and 21 that the magnetic flux that is produced by rotor coil 19 forms magnetic pole by flowing through.A pair of

field core

20 and 21 is made of iron, respectively in the neighboring along the circumferential direction with etc. angular separation protrude 6 trapezoidal claw-type pole 20a and 21a be set, and with claw-type pole 20a and 21a mutually chimeric state be fixed on vis-a-vis on the rotating shaft 6.

Fan

13 and 14 with blade 13a, 14a is separately fixed at the axial two ends of rotor 7.

Stator 8 by stator core 15 with Wire-wound in this stator core 15 and produce the stator coil 16 that exchanges along with the rotation of rotor 7 according to flux change and constitute from rotor 7.

The conventional truck of said structure with alternating current generator on, electric current is supplied with rotor coil 19 and is produced magnetic flux through brush 10 and collecting ring 9 from storage battery (not shown).By this magnetic flux, the claw-type pole 20a of a field core 20 is magnetized to the N utmost point, and the claw-type pole 21a of another field core 21 is magnetized to the S utmost point.On the other hand, the torque of engine passes to rotating shaft 6 through belt and belt pulley 5, makes rotor 7 rotations.

So just on stator coil 16, apply rotating magnetic field, make on the stator coil 16 and produce electromotive force.The electromotive force of this interchange is rectified into direct current after by rectifier 12, and its size is regulated and is recharged in storage battery by voltage regulator 18 simultaneously.

And in the front side, because the rotation of fan 13, cooling air from the suction hole 1a inflow of front rack 1, is discharged to the outside from steam vent 1b after with bearing 3, field core 20, rotor coil 19, stator core 15 and stator coil 16 coolings as shown by arrow A.On the other hand, at rear side, because the rotation of fan 14, cooling air as shown by arrow B, flow into from the suction hole 2a of tail-bracket 2, after with bearing 4, voltage regulator 18, rectifier 12, field core 21, rotor coil 19, stator core 15 and stator coil 16 coolings, discharge to the outside from steam vent 2b.

The conventional truck of said structure is used alternating current generator owing to adopt above structure, so because rotation of

field core

20 and 21, can produce pressure oscillation because of the claw-type pole 20a and the cutting in and out of 21a of

field core

20 and 21 peripheral parts, the antitriptic wind sound acoustic pressure of 12nd secondary frequencies consistent with the sum (12) of claw-type pole 20a, 21a is very remarkable, very ear-piercing, and total sound level increases.

Summary of the invention

The applicant has studied the problems referred to above with keen determination, if the sum of discovery claw-type pole is total consistent with suction hole, then just become remarkable with the acoustic pressure of the antitriptic wind sound of the frequency of the total consistent number of times of claw-type pole, and the circumferencial direction draft loss balance of suction end can influence antitriptic wind sound, the total draft loss that influences antitriptic wind sound in addition depends on the exhaust resistance of exhaust end to a great extent, so produced the present invention.

Promptly, the object of the present invention is to provide a kind of vehicle-mounted dlternator, the sum of its suction hole is different from the sum of claw-type pole, can make the draft loss balance optimization of suction end, reduce the exhaust resistance of exhaust end, reduce the acoustic pressure with the antitriptic wind sound of the frequency of the total consistent number of times of claw-type pole, reduce total sound level, and eliminate ear-piercing sense.

Vehicle-mounted dlternator of the present invention is provided with: have a pair of field core that protrudes a plurality of trapezoidal claw-type poles be arranged at peripheral edge portion this claw-type pole ground that is meshing with each other is fixed on the rotor that forms on the rotating shaft after relatively; Take bowl structure and with the bearing accommodation section that is arranged on central portion, be arranged on 4 in-and-out bolt portions on the same circumference and bearing accommodation section and 4 flanks that each in-and-out bolt portion is connected respectively are main skeleton, a plurality of suction holes along the circumferential direction are being set between each flank and a plurality of steam vents along the circumferential direction are set, are supporting the front rack of the front side of above-mentioned rotating shaft by the bearing that is contained in this bearing accommodation section between each in-and-out bolt portion with equi-angularly space; Take bowl structure and have the bearing accommodation section that is arranged on central portion and be arranged on 4 in-and-out bolt portions on the same circumference, periphery a plurality of suction holes are set and a plurality of steam vents along the circumferential direction are set between each in-and-out bolt portion, support the tail-bracket of the rear side of above-mentioned rotating shaft by being contained in bearing in this bearing accommodation section in the bearing accommodation section with equi-angularly space; Use the in-and-out bolt of the in-and-out bolt portion of having passed above-mentioned two carriages to be anchored on two stators on the carriage with the state that the periphery with above-mentioned a pair of field core surrounds; Be individually fixed in the axial both ends of the surface of above-mentioned a pair of field core and cooling air is introduced a pair of fan in above-mentioned front rack and the tail-bracket from above-mentioned suction hole, be characterized in, the sum of being located at the above-mentioned suction hole on the above-mentioned front rack is different from the sum of above-mentioned a pair of claw-type pole, but also the side by in-and-out bolt portion of each flank is provided with steam vent on above-mentioned front rack.

Because the present invention adopts above structure, so can obtain alleviating, total sound level reduces, the vehicle-mounted dlternator of ear-piercing sense disappearance with the acoustic pressure of the antitriptic wind sound of the frequency of the total consistent number of times of claw-type pole.

In addition, above-mentioned a pair of claw-type pole of the present invention add up to 12, what be located at above-mentioned suction hole on the above-mentioned front rack adds up to 14, and along the circumferential direction is arranged alternately 3 suction holes and 4 suction holes in 4 zones of the above-mentioned front rack of along the circumferential direction being divided by above-mentioned flank.

Because the present invention adopts above structure, so the suction end draft loss is good in the balance of circumferencial direction, can reduce antitriptic wind sound.

Description of drawings

Fig. 1 is a front view of seeing the vehicle-mounted dlternator of the invention process form 1 from the front side.

Fig. 2 is the cutaway view along II-II line among Fig. 1.

Fig. 3 is a front view of seeing traditional vehicle-mounted dlternator from the front side.

Fig. 4 is the cutaway view along IV-IV line among Fig. 3.

Embodiment

Below in conjunction with description of drawings example of the present invention.

Fig. 1 is a front view of seeing the vehicle-mounted dlternator of the invention process form 1 from the front side, and Fig. 2 is the cutaway view along II-II line among Fig. 1.Omitted belt pulley among Fig. 1.

In Fig. 1 and Fig. 2, the front rack 50 of aluminum adopts bowl structure, with the bearing accommodation section 51 of being located at central portion, be arranged on 4 in-and-out bolt portions 52 on the same circumference, be bearing accommodation section 51 main skeleton with 4 flanks 53 that each in-and-out bolt portion 52 is connected respectively with equi-angularly space, suction hole 50a between each flank 53 along the circumferential direction 3 one group and be arranged alternately 4 by one group, a plurality of steam vent 50b along the circumferential direction are set respectively between each in-and-out bolt portion 52, and also the side by in-and-out bolt portion 52 at each flank 53 is provided with steam vent 50c.

In addition, the in-and-out bolt 35 that passes the in-and-out bolt portion 52 on the front rack 50 is anchored on in-and-out bolt portion 34 on the tail-bracket 2, and with the periphery both ends of the edge of opening portion clamping stator core 15 of front rack 50 and tail-bracket 2 that stator 8 is fixing.

This vehicle-mounted dlternator is except replacing front racks 1 with front rack 50, all the other structures are all identical with Fig. 3 and vehicle-mounted dlternator shown in Figure 4.

Front side at the vehicle-mounted dlternator of this example 1, because the rotation of fan 13, cooling air as shown by arrow A, flow into from the suction hole 50a of front rack 50, after with bearing 3, field core 20, rotor coil 19, stator core 15 and stator coil 16 coolings, discharge to the outside from steam vent 50b, 50c.On the other hand, at rear side, because the rotation of fan 14, cooling air as shown by arrow B, flow into from the suction hole 2a of tail-bracket 2, after with bearing 4, voltage regulator 18, rectifier 12, field core 20, rotor coil 19, stator core 15 and stator coil 16 coolings, 2b discharges to the outside from steam vent.

This example 1 has been owing to formed 14 suction hole 50a that quantity is different from the sum (12) of claw-

type pole

2a, 21a on front rack 50, thus with the acoustic pressure reduction of the antitriptic wind sound of the 12nd total consistent secondary frequencies of claw-type pole 20a, 21a.And, except between each in-and-out bolt portion 52, along the circumferential direction being provided with respectively a plurality of steam vent 50b, also the side by in-and-out bolt portion 52 at each flank 53 is provided with steam vent 50c, so the gross area of steam vent is increased, alleviate the draft loss of exhaust end, and alleviated the total draft loss that influences antitriptic wind sound.Therefore, can obtain the vehicle-mounted dlternator that overall sound pressure level reduces, ear-piercing sense disappears.

Because 3 suction hole 50a and 4 suction hole 50a along the circumferential direction alternately are arranged in 4 zones being divided by flank 53,, can reduce antitriptic wind sound again so can obtain the balance of the draft loss of front rack 50 suction sides at circumferencial direction.In other words, with in each zone of dividing with flank 53, the occasion of none identical suction hole of quantity is set or in 1 group of adjacent zone 3 suction holes is set and occasion that 4 suction holes are set is compared in other 1 group of adjacent areas, when adopting the suction hole aligning method of this example 1, the suction side draft loss is better in the balance of circumferencial direction.

In addition, owing to be provided with 14 suction hole 50a, in the balance of suction side draft loss that guarantees front rack 50, can make the gross area maximum of suction hole 50a at circumferencial direction at 12 claw-type pole 20a, 21a.In other words, if suction hole 50a is decided to be 13,, can reduce the balance of draft loss at circumferencial direction though then can increase the gross area of suction hole 50a.And if suction hole 50a is decided to be more than 15, then can reduce the gross area of suction hole 50a again.

Also have, above-mentioned example 1 is at 12 claw-type pole 20a, 21a 14 suction hole 50a to be set, but the sum of suction hole 50a is not limited to 14, as long as make the sum of claw-type pole 20a, 21a be different from the sum of suction hole 50a.

In addition, above-mentioned example 1 is 12 the vehicle-mounted dlternator of ading up to that is used for claw-type pole 20a, 21a, but the present invention is not so limited, and other the total different vehicle-mounted dlternators that promptly are used in claw-type pole also have effect same.

Claims

1. vehicle-mounted dlternator is provided with: have a pair of field core that protrudes a plurality of trapezoidal claw-type poles that are arranged at peripheral edge portion this claw-type pole ground that is meshing with each other is fixed on the rotor that forms on the rotating shaft after relatively; Take bowl structure and with the bearing accommodation section that is arranged on central portion, be arranged on 4 in-and-out bolt portions on the same circumference and bearing accommodation section and 4 flanks that each in-and-out bolt portion is connected respectively are main skeleton, a plurality of suction holes along the circumferential direction are being set between each flank and a plurality of steam vents along the circumferential direction are set, are supporting the front rack of the front side of described rotating shaft by the bearing that is contained in this bearing accommodation section between each in-and-out bolt portion with equi-angularly space; Take bowl structure and have the bearing accommodation section that is arranged on central portion and be arranged on 4 in-and-out bolt portions on the same circumference, periphery a plurality of suction holes are set and a plurality of steam vents along the circumferential direction are set between each in-and-out bolt portion, support the tail-bracket of the rear side of described rotating shaft by being contained in bearing in this bearing accommodation section in the bearing accommodation section with equi-angularly space; Use the in-and-out bolt of the in-and-out bolt portion of having passed described two carriages to be anchored on two stators on the carriage with the state that the periphery with described a pair of field core surrounds; Be individually fixed in the axial both ends of the surface of described a pair of field core and cooling air introduced a pair of fan in described front rack and the tail-bracket from described suction hole,

It is characterized in that the sum of being located at the described suction hole on the described front rack is different from the sum of described a pair of claw-type pole, but also the side by in-and-out bolt portion of each flank is provided with steam vent on described front rack.

2. vehicle-mounted dlternator according to claim 1, it is characterized in that, described a pair of claw-type pole add up to 12, what be located at described suction hole on the described front rack adds up to 14, and along the circumferential direction is arranged alternately 3 suction holes and 4 suction holes in 4 zones of the described front rack of along the circumferential direction being divided by described flank.