CN1065677C

CN1065677C - A.C. generator for vehicle

Info

Publication number: CN1065677C
Application number: CN95116088A
Authority: CN
Inventors: 来栖恭子; 足立克己
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1995-10-30
Filing date: 1995-10-30
Publication date: 2001-05-09
Anticipated expiration: 2015-10-30
Also published as: CN1149777A

Abstract

The present invention relates to an AC generator for automotive vehicles. A rotor of the generator is constructed so that a rotating shaft can realize press fit to a pair of claw type magnetic poles; a preload is exerted to a field coil, and a winding tube is clamped between the magnetic poles; the position of the preload between the outer diameter direction part of a magnetic yoke of the magnetic poles and the outer diameter direction part of the side wall of the winding tube is provided with a device for preventing rotation.

Description

The alternating current generator of motor vehicle

The present invention relates to be contained in the rotor of a kind of alternating current generator above the motor vehicles etc.

The cutaway view of the ordinary AC generator of motor vehicle has been shown among Fig. 8.Numbering 1 expression rotor, this rotor is made up of the magnetic pole 2 of a pair of pawl formula, the magnet exciting coil bobbin 3 that is wound with magnet exciting coil 4 above, rotating shaft 5 and slip ring 6.Magnet exciting coil bobbin 3 is clipped in this between the pawl formula magnetic pole 2 by rotating shaft 5 toward the cooperation that is pressed in the magnetic pole 2.Numbering 7 expression stators, this stator arrangement forms a little gap between the two on magnetic pole 2 opposites.Numbering 8 expression brush carriers, voltage regulator promptly is contained in the brush carrier 8.Numbering 9 expression rectifiers.Numbering 10 expression driven pulleies, this belt pulley firmly is fixed in the rotating shaft 5.Numbering 11 expression cooling fans, these fans are fixed on magnetic pole 2 both

sides.Numbering

12 and 13 is represented support respectively.Numbering 14 and 15 is represented bearing respectively, is supporting rotor 1 rotationally by these bearings.

Referring to Fig. 9, there is shown the magnetic pole 2 of rotor 1 and the exploded view of bobbin 3.Among the figure, numbering 2a represents the inner surface of magnetic pole 2 yokes.Numbering 3a represents the sidewall of bobbin 3.Inner surface is the yoke of 2A, its wall thickness from interior radially the part outwardly radial component become big gradually.Spacing between the yoke two inner surface 2a obtains the width less than bobbin 3 in pairs.After these parts assemble, be added with preload between the outer radial part of coiling tube wall side 3a and the radial component of yoke inner surface 2a.

The working condition of generator is described now.Field current is added to magnet exciting coil 4, when belt drives belt pulley 10 rotations simultaneously, induces alternating current in the stator 7 by brush carrier 8 and slip ring 6.Alternating current rectifier 9 is exported away after being transformed into direct current.In theory, when the natural frequency of the vibration frequency that magnetic attraction causes and magnetic pole 2 is consistent, produce so-called covibration, the form of the remarkable noise peak that this covibration can the magnetic pole electric and magnetic oscillation causes detects.The sort of design of above-mentioned preload make magnet exciting coil 3 can be used as damper suppress this significantly and noise peak.

Ordinary AC generator with this structure, be clipped in field coil assembly between the magnetic pole 2 and be subjected to the influence of centrifugal force, thereby lost structurally integrated of itself and magnetic pole, thereby field coil assembly may weaken above-mentioned damping action when rotating in the worst case.

The objective of the invention is to overcome the above-mentioned shortcoming of the ordinary AC generator of motor vehicle, a kind of can the preventing that motor vehicle is provided is added to the electromagnetic noise that produces on the magnetic pole, and can prevents the alternating current generator that field coil assembly rotates because of angular acceleration because of magnetic attraction.

Above and other objects of the present invention are to reach by a kind of like this alternating current generator that motor vehicle is provided: a kind of alternating current generator of motor vehicle, wherein the rotor body plan of generator must make rotating shaft be press-fit in a pair of pawl formula magnetic pole, bobbin is clipped between each magnetic pole, the yoke inner surface of magnetic pole or the sidewall of bobbin are formed with an outer radial part, make its wall thickness be thicker than in part radially, provide a preload applying portion, and the preload applying portion is equipped with and prevents tumbler.

A kind of alternating current generator of motor vehicle, the rotor body plan of the utmost point of wherein generating electricity must make rotating shaft be press-fit in a pair of pawl formula magnetic pole, bobbin is clipped between each magnetic pole, the part that is added with preload has the projection that contacts with the bobbin sidewall at magnetic pole yoke inner surface near yoke outer radial position partly, and the part that perhaps is added with preload is established the projection that contacts with the inboard table of magnetic pole yoke at the outer surface of bobbin sidewall near the position of bobbin sidewall outer radial part.

The part that the each several part body plan that best alternating current generator is added with preload must make magnetic pole yoke inner surface contact with the bobbin sidewall, its wall thickness is greater than the interior radially part of yoke inner surface.

The outer radial part that the each several part body plan that best alternating current generator is added with preload must make the bobbin sidewall contact with magnetic pole yoke inner surface, its wall thickness is greater than the interior radially part of bobbin sidewall.

The part that preferably is added with preload exceptionally is provided with the projection that contacts with the bobbin sidewall at magnetic pole yoke inner surface near the yoke outer radial portions.

The part that preferably is added with preload is provided with the projection that contacts with magnetic pole yoke inner surface near bobbin sidewall external diameter with the part place on bobbin sidewall outer surface.

According to the present invention of this design, preload can be added between magnetic pole and the magnet exciting coil bobbin, utilizes bobbin as shockproof damper, and prevents that field coil assembly from rotating, thereby has improved the reliability and the commodity value of generator.

Referring now to the accompanying drawing act, content of the present invention just is described.

Fig. 1 is the cutaway view of an embodiment of a kind of alternator rotor of motor vehicle of the present invention.

Fig. 2 is that the parts of each major part of rotor shown in Figure 1 decompose, the part sectional side view.

Fig. 3 is the end view that magnetic pole shown in Figure 2 is looked from magnet exciting coil bobbin direction.

Fig. 4 is the end view of magnet exciting coil bobbin shown in Figure 2.

Fig. 5-the 7th, the parts of each major part of rotor of other embodiment of the present invention decompose, the part sectional side view.

Fig. 9 is that the parts of general each major part of generator amature decompose, the part sectional side view.

The cutaway view of alternator rotor of the motor vehicle of one embodiment of the invention has been shown among Fig. 1.The parts that rotor shown in Figure 1 has been shown among Fig. 2 decompose, the part sectional side view.

As shown in Figure 2, the yoke of pawl formula magnetic pole, stupefied the same of the wall thickness of its inner surface and general generating, radial component increases gradually outwardly.In pairs the spacing between the inner surface 2a of yoke obtains when making bobbin 3 be clipped between the paired magnetic pole 2 less than the width of magnet exciting coil around pipe 3, thereby between the outer radial portions that has when these parts are assembled preload to be added in the outer radial part of bobbin sidewall 3a and yoke inner surface 2a divides.

Being added with those parts of preload, be formed with recessed portion 2c on the inner surface 2a of one of them magnetic pole, and be formed with projection 3c on one of them sidewall of bobbin, thereby prevent that field coil assembly from rotating because of angular acceleration.Described recessed portion and projection not only play a part to prevent to rotate, but also work to apply preload.Recessed portion and projection are located at the position between the magnetic pole that adjoins, for example 6 positions as shown in Fig. 3 and Fig. 4.

Among Fig. 5, can see the sidewall 3a of bobbin, its wall thickness increases gradually towards the direction of bobbin outer radial part.The projection that is located on the bobbin had both play a part to prevent to rotate also to work to apply load, its effect and similar shown in Figure 2.

Among Fig. 6, can see that the inner surface 2a of yoke is added with preload near inner surface outer radial portions office by similar mode.In addition, be equipped with recessed portion 2c in the yoke, be equipped with projection 3c on the bobbin, both have worked to prevent that bobbin from rotating.In the case, these recessed portions and projection can also work to apply preload.

Among Fig. 7, one of them sidewall 3a that can see bobbin has applied preload in a similar fashion near being formed with projection 3b on the sidewall outer radial part.Equally, be formed with recessed portion 2c on the yoke, be formed with projection 3c on the bobbin.

Said above that preload was to be added between the outer radial part of magnetic pole yoke inner surface 2a and bobbin sidewall 3a outer radial portions divide, thereby bobbin can play damper and suppress magnetic pole 2 vibrations, cross with reference to relevant description of drawings above this point.

In general generator, vibration frequency produces so-called covibration because of the natural frequency of magnetic attraction and magnetic pole 2 when consistent, and the vibration of magnetic pole 2 can be used as because of electric and magnetic oscillation and causes that the peak value of remarkable noise is detected.Rotor of the present invention, its bobbin 3 can play damper all the time, suppresses the noise of the electric and magnetic oscillation that causes because of covibration.

Claims

1. a kind of alternating current generator of motor vehicle, wherein the rotor body plan of generator must make rotating shaft be press-fit in a pair of pawl formula magnetic pole, bobbin is clipped between each magnetic pole, it is characterized in that, the yoke inner surface of magnetic pole or the sidewall of bobbin are formed with an outer radial part, make its wall thickness be thicker than in part radially, provide a preload applying portion, and the preload applying portion is equipped with and prevents tumbler.

2. a kind of alternating current generator of motor vehicle, wherein the rotor body plan of generator must make rotating shaft be press-fit in a pair of pawl formula magnetic pole, bobbin is clipped between each magnetic pole, it is characterized in that, the part that is added with preload has the projection that contacts with the bobbin sidewall at magnetic pole yoke inner surface near yoke outer radial position partly, and the part that perhaps is added with preload is established the projection that contacts with the inboard table of magnetic pole yoke at the outer surface of bobbin sidewall near the position of bobbin sidewall outer radial part.