JP2003032980A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alternating-current generator for vehicle wherein reliability can be enhanced, and increase in cost can be suppressed by reducing vibration produced in the radiation fins of a rectifying device. SOLUTION: The rectifying device 6 installed in the alternating-current generator 1 for vehicle comprises a positive-pole side fin 61, a negative-pole side fin 62, a terminal block 63, a bush 64, and a pipe rivet 65. The terminal block 63 has a plurality of projected portions 67, which function as support members for pressing and supporting the end of the positive-pole side fin 61 in the radial direction. The projected portions 67 are in the form of pawl which makes the projected portions suitable for anchoring the end of the positive-pole side fin 61 in the radial direction, and are molded integrally with the terminal block 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine for a vehicle, and more particularly to a vehicle AC generator mounted on a passenger car, a truck or the like.

[0002]

2. Description of the Related Art In recent years, due to the need for slant nose to reduce vehicle running resistance and securing a living space in the passenger compartment, the space for installing a vehicle alternator has become larger as the engine room has become narrower. It's gone. Also,
The engine speed has been reduced to improve fuel efficiency, and the rotational speed of the vehicle AC generator has also decreased accordingly. But,
On the other hand, it is required to increase the electric load of safety control devices and the like, and further to improve the power generation capacity. That is, it is required to provide a small-sized and high-output vehicle AC generator at low cost. In addition, some vehicle engines in recent years have increased in vibration level due to higher performance. Therefore, the vehicle alternator is required to have a performance that does not cause defects such as power generation failure even under such a severe mounting environment.

FIG. 5 is a sectional view of a peripheral portion of a rectifying device of a conventional vehicle AC generator. The rectifying device 100 is housed in the component housing chamber S between the frame 90 and the rear cover 92. A terminal block 104, a positive-side heat radiation fin 106, a bush 108, and a negative-side heat radiation fin 110 are sequentially stacked on the pipe rivet 102, and then the pipe rivet 1
The end portion of 02 is fixed by caulking and the rectifying device 100 is assembled. A positive electrode side rectifying element (not shown) is fixed to the positive electrode side heat radiation fin 106, and a negative electrode side rectifying element (not shown) is fixed to the negative electrode side heat radiation fin 110 by soldering, driving, etc. It is connected. In addition, the terminal block 104 has a metal terminal 1 forming a rectifying circuit.
12 is integrally formed, one end of which is electrically connected to the lead wire 94 extending from the stator winding, and the other end of which is electrically connected to the lead portion of the rectifying element.

After the bolt 96 driven into the frame 90 is inserted into the pipe rivet 102 to mount the rectifying device 100, the mounting hole of the rear cover 92 is fitted into the bolt 96, and the nut 98 is tightened from above to rectify. The device 100 and the rear cover 92 are fixed to the frame 90 in the axial direction. As a result, the positive radiation fins 106 are attached and held in a state of being separated from the negative radiation fins 110, the frame 90, the bolts 96, and the rear cover 92.

[0005]

By the way, in the rectifying device included in the above-described conventional vehicle alternator, the positive-side radiating fins 106 and the negative-side radiating fins 110 have a large area in order to improve heat radiation. Is set, and the terminal block 104 and the bush 108 are attached in an overhanging state from a fixed portion. Therefore, as the performance of the vehicle alternator increases, the vibration level increases, and the vibration frequency is higher than that of the positive-side heat radiation fin 1.
06 or the natural frequency of the negative radiation fin 110 may cause excessive stress due to resonance, and lead wire 94 extending from the lead portion of the rectifying element or the stator winding.
However, there was a problem that it was damaged and reliability was lowered.

In order to suppress the resonance of the radiation fins, it is possible to add rubbers to the part where the vibration is large to damp the excessive vibration, but in order to withstand the high temperature environment,
It is necessary to use a very expensive rubber material such as fluorine and silicon. A method of bonding a heat radiation fin to the terminal block 104 to damp vibration is also conceivable, but the adhesive strength of the adhesive is low in a high ambient temperature / high vibration environment, and is therefore very effective for improving reliability. It cannot be said that it is a countermeasure.

The present invention has been made in view of the above points, and an object thereof is to improve the reliability by reducing the vibration generated in the heat radiation fins of the rectifier. Moreover, it is to provide a rotating electric machine capable of suppressing an increase in cost.

[0008]

In order to solve the above-mentioned problems, a rotating electric machine according to the present invention has a rectifying circuit in which a plurality of rectifying elements are electrically connected to a radiation fin to which a plurality of rectifying elements are fixed. And a terminal block into which a metal terminal constituting the above is inserted. The rectifying device also includes a support member that presses and supports the radial end portion of the radiation fin in the axial direction or the radial direction. By supporting the radial end portion in which a large amplitude is likely to occur when vibration is applied to the heat radiation fin by a support member in the axial direction or the radial direction, vibration generated in the heat radiation fin is reduced and the lead portion of the rectifying element or the stator. It is possible to prevent breakage of the lead wire extending from the winding and improve reliability.

Further, it is desirable that the above-mentioned supporting member is integrally formed with the terminal block. As a result, it is possible to suppress an increase in cost as compared with the case where vibration is reduced by using an additional component such as expensive rubber. Further, the above-mentioned support member has a claw shape that comes into contact with the radial end of the heat radiation fin in the axial direction and the radial direction, and it is desirable that the heat radiation fin is assembled by elastically deforming this support member. As a result, it is possible to lock the radial end of the heat radiation fin in the axial direction or the radial direction with elastic force by the support member having the claw shape, and it is possible to reliably reduce the vibration generated in the heat radiation fin. it can.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The rotary electric machine of the present invention can be used, for example, in a vehicle alternator mounted on an engine and rotationally driven by the engine. Hereinafter, a vehicle AC generator according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the overall construction of the vehicle alternator of this embodiment. The vehicle alternator 1 shown in FIG. 1 includes a stator 2, a rotor 3, a rear frame 4, a front frame 5, a rectifying device 6, a rear cover 7, and the like. The stator 2 functions as an armature, and includes a stator core 22 and a three-phase stator winding 23.

The rotor 3 has six field windings 31 each of which is formed by cylindrically and concentrically winding an insulated copper wire.
By the pole core 32 having the individual claw portions, the rotating shaft 33
It has a structure sandwiched from both sides. Also,
A cooling fan 35 for discharging the cooling air sucked from the front side in the axial direction and the radial direction is attached to the end surface of the front side pole core 32 by welding or the like. Similarly, a cooling fan 36 for discharging the cooling air sucked in from the rear side in the radial direction is attached to the end surface of the rear side pole core 32 by welding or the like. In the vicinity of the rear end of the rotating shaft 33, two slip rings 37 electrically connected to both ends of the field winding 31,
38 is formed, these slip rings 37,
From the brush device (not shown) through the field winding 31
Is supplied to.

Rear frame 4 and front frame 5
Accommodates the stator 2 and the rotor 3, and the rotor 3
Are rotatably supported about the rotation shaft 33. Further, the stator 2 arranged on the outer peripheral side of the pole core 32 of the rotor 3 with a predetermined gap is fixed to the front frame 5.

The rectifying device 6 is for rectifying the three-phase AC voltage, which is the output voltage of the three-phase stator winding 23, to obtain DC output power. Details of the rectification device 6 will be described later. The rear cover 7 covers the rectifying device 6 mounted on the outside of the rear frame 4 and other electric components (brush device, IC regulator, etc.) to protect them. This rear cover 7 has a metal nut 71.
To the bolt 41 extending from the frame 4 on the rear side,
The rectifying device 6 is clamped and fixed in a state of being sandwiched. Further, the rear cover 7 mainly has a plurality of suction windows on the facing surface of the rectifying device 6, and the cooling air is sucked into the rear cover 7 through the suction windows.

A vehicle alternator 1 having the above-mentioned structure
Is an engine (not shown) attached to the pulley 8 via a belt or the like.
When the rotational force is transmitted from the rotor 3, the rotor 3 rotates in a predetermined direction. By applying an exciting voltage from the outside to the field winding 31 of the rotor 3 in this state, each claw portion of the pole core 32 is excited and a three-phase AC voltage can be generated in the stator winding 23. A predetermined DC current is taken out from the output terminal 10 provided in the rectifier 6.

Next, the details of the rectifying device 6 will be described. FIG. 2 is an enlarged cross-sectional view of the periphery of the rectifying device 6 of the vehicle AC generator 1 according to this embodiment. As shown in FIG. 2, the rectifying device 6 of the present embodiment is configured to include a positive electrode side heat radiation fin 61, a negative electrode side heat radiation fin 62, a terminal block 63, a bush 64, and a pipe rivet 65. This rectifying device 6
Are stored in a component storage chamber S formed between the rear frame 4 and the rear cover 7 made of a metal plate. The end portion of the pipe rivet 65 is caulked and fixed in a state where the terminal block 63, the positive radiation fin 61, the bush 64, and the negative radiation fin 62 are stacked on the pipe rivet 65, and the rectifying device 6 is provided.
Is assembled.

A plurality of (for example, three) positive electrode side rectifying elements (not shown) are fixed to the positive electrode side heat radiation fins 61 by soldering or driving, and heat generated by these positive electrode side rectifying elements is radiated. To do. In addition, the negative electrode side heat dissipation fin 62
Has a plurality of (for example, three) negative side rectifying elements (not shown) fixed by soldering or driving, and radiates the heat generated by these negative side rectifying elements.

The terminal block 63, together with the bush 64, holds the positive electrode side heat radiation fins 61 and the negative electrode side heat radiation fins 62 at a predetermined distance. A metal terminal 66, which forms a three-phase full-wave rectifier circuit by wiring the positive electrode side rectifying element and the negative electrode side rectifying element, is inserted into the terminal block 63 and integrally formed. The metal terminal 66 has a lead wire 2 whose one end extends from the stator winding 23.
4, and the other end is electrically connected to the lead portion of each rectifying element fixed to the positive electrode side heat radiation fin 61 or the negative electrode side heat radiation fin 62. For example,
As a molding resin material for the terminal block 63, a thermoplastic resin excellent in moldability, dimensional stability, heat resistance, electric insulation strength and the like, which is represented by polyphenylene sulfide, is used. On the other hand, the bush 64 interposed between the positive radiation fin 61 and the negative radiation fin 62 does not need to be integrally molded with a metal such as the terminal block 63, and these radiation fins are separated from each other. It has a simple cylindrical shape and is used, for example, a relatively inexpensive thermosetting resin typified by phenol.

Further, the terminal block 63 is composed of the radiation fins 6 on the positive electrode side.
It has a plurality of protrusions 67 as a support member that presses and supports the radial end portion of No. 1. The protrusion 67 has a claw shape suitable for locking the radial end portion of the positive radiation fin 61, and is integrally formed with the terminal block 63.

FIG. 3 shows the protrusion 6 formed on the terminal block 63.
It is a perspective view which shows the shape of 7. As shown in FIG. 3, the protrusion 67 is formed using a part of the terminal block 63,
By locking the projection 67 to the radial end portion of the positive electrode side heat radiation fin 61, the radial end portion of the positive electrode side heat radiation fin 61 is restrained.

FIG. 4 shows the protrusion 6 formed on the terminal block 63.
It is a figure which shows the attachment state of 7. The rectifying device 6 of the present embodiment is configured such that the radial end portion of the positive-side heat radiation fin 61 and the protruding portion 6
7 and 7 are integrated with a tightening allowance, but it is conceivable that there is a tightening allowance in the axial direction and a tightening allowance in the radial direction.

When the tightening margin is provided in the axial direction, the position where the heat radiating fin 61 is pressed against the terminal block 63, as shown by the arrow in FIG. The tip of the protrusion 67 is moved up to. The portion of the positive-side heat radiation fin 61 with which the protrusion 67 abuts is formed in a shape close to a flat surface so that the protrusion 67 can easily move.

Further, in the case of providing a tightening allowance in the radial direction, as shown in FIG. 4 (A), the positive electrode side heat radiation fin 61 is pressed against the terminal block 63 side while elastically deforming the protrusion 67 in the radial direction. . As indicated by the arrow in FIG. 4 (B),
When the protruding portion 67 returns to the original position, the radial end of the positive electrode side heat radiation fin 61 is pressed by the spring force of the protruding portion 67, and the positive electrode side heat radiation fin 61 and the protruding portion 67 are integrated.

The above-mentioned rectifying device 6 is mounted so that the pipe rivet 65 is fitted to the bolt 41 driven into the rear frame 4, and then the mounting hole of the rear cover 7 is fitted into this bolt 41, and from above it. The rectifying device 6 and the rear cover 7 are fastened and fixed in the axial direction with the nut 71.
As a result, the positive radiation fin 61 is fixed in a state of being separated from the negative radiation fin 62, the rear frame 4, the bolt 41, and the rear cover 7.

Thus, the terminal block 63 included in the rectifying device 6 is integrally formed with the projection 67 for pressing and supporting the radial end of the positive-side heat radiation fin 61 in the radial and axial directions. By constraining the radial end portion in which a large amplitude is likely to occur when vibration is applied to the fin 61 in the axial direction or the radial direction, the vibration generated in the positive electrode side heat radiation fin 61 can be reduced. As a result, it is possible to prevent the lead portion of the positive electrode side rectifying element fixed to the positive electrode side heat radiation fin 61, the lead wire extending from the stator winding 23, and the like from being damaged by vibration, and to improve reliability. It will be possible.

In particular, by using the projection 67 integrally formed on the terminal block 63, it is possible to reduce the parts cost, the assembly cost, etc., as compared with the case where vibrations are reduced by adding expensive rubber or the like. It will be possible. Further, by forming the protrusion 67 in a claw shape, it becomes possible to restrain the radial end of the positive electrode side heat radiation fin 61 from both sides in the radial direction and the axial direction, and the vibration generated in the positive electrode side heat radiation fin 61 can be suppressed. It can be surely reduced.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the embodiment described above,
The case where the radial direction end portion of the positive-side heat radiation fin 61 is locked by the protrusion 67 provided on the terminal block 63 has been described.
Instead of the positive-side radiating fin 61, or together with the positive-side radiating fin 61, the radial end of the negative-side radiating fin 62 may be constrained.

Further, in the above-described embodiment, the terminal block 63
Although the protrusion 67 integrally formed with the terminal portion 63 is used, the radial end portions of the positive electrode side heat radiation fin 61 and the negative electrode side heat radiation fin 62 are connected to the terminal block 63 by using a supporting member prepared as a separate component from the terminal portion 63. It may be fixed to.

Further, although the vehicle AC generator has been described in the above embodiment, the present invention may be applied to a vehicle other than the vehicle or a rotating electric machine used outside the vehicle.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a vehicle AC generator according to an embodiment.

FIG. 2 is an enlarged cross-sectional view of a portion around a rectifier of the vehicle AC generator shown in FIG.

FIG. 3 is a perspective view showing the shape of a protrusion formed on the terminal block.

FIG. 4 is a view showing a mounting state of a protrusion formed on a terminal block.

FIG. 5 is a cross-sectional view of a peripheral portion of a rectifier of a conventional vehicle AC generator.

[Explanation of symbols]

1 Vehicle AC generator 2 stator 3 rotor 4 rear frame 5 front frame 6 Rectifier 7 Rear cover 61 Radiating fin on the positive electrode side 62 Negative radiation fin 63 terminal block 66 Metal terminal 67 Projection

Claims (3)

[Claims] 1. A rectifying device having a radiation fin to which a plurality of rectifying elements are fixed, and a terminal block into which a metal terminal that electrically connects the plurality of rectifying elements to form a rectifying circuit is inserted. In the rotary electric machine, the rectifying device includes a support member that presses and supports a radial end portion of the radiation fin in an axial direction or a radial direction. 2. The rotating electric machine according to claim 1, wherein the support member is integrally formed with the terminal block. 3. The support member according to claim 2, wherein the support member has a claw shape that is in contact with a radial end portion of the heat radiation fin in the axial direction and the radial direction, and the heat radiation fin elastically supports the support member. A rotating electric machine characterized by being deformed and assembled.