JPH08331806A - Power generator - Google Patents

Abstract

PURPOSE: To improve the coolability of a power generator with a simple structure by installing an annular section for limiting the creeping of hot air which limits the circulation of hot air discharged from a discharge window to a suction window to a frame part between the suction window and discharge window. CONSTITUTION: A section 12 for limiting creeping of hot air is provided with a front end section 12a which is protruded from the rear end face 5b of a pulley 5, but not protruded from the front end face 5c of the pulley 5, a maximum- diameter section 12b which is not protruded from the peripheral wall section la of a frame 1 in the radial direction, and a minimum-diameter section 12c which is not protruded from the discharge window-side side face 10a of the window 10 in the radial direction. When a belt 8 is driven by means of an engine and the pulley 5 is rotated by the belt 8, a driving shaft 3a rotates together with the pulley 5 and a cooling fan 9 rotates. As a result, cooling air is sucked into the frame 1 through the window 10, cools a stator 2, and is discharged from a discharge window 11 as hot air, but the creeping of the hot air to the window 10 is limited by the section 12. Therefore, the interior of the frame 1 can be efficiently cooled with a simple structure and the coolability of a power generator can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator, such as a generator for a vehicle, having a cooling mechanism for cooling the inside of a frame.

[0002]

2. Description of the Related Art Generally, a cooling mechanism for a vehicle generator is provided in a rotor inside a frame and faces a cooling fan that rotates integrally with the rotor and a pulley that rotationally drives a drive shaft of the rotor. A suction window is formed in the side wall portion for sucking the cooling air due to the rotation of the cooling fan into the frame, and a frame peripheral wall portion facing the outer peripheral surface side of the rotor. The temperature is increased by passing the inside of the frame. It is composed of a discharge window for discharging the cooling air to the outside of the frame.

[0003]

However, in recent years,
When the vehicle generator is reduced in size and output in order to meet the demands for increased electric load on the vehicle and higher engine room density, the cooling performance of the generator with the conventional cooling mechanism deteriorates. Occurred.

Although the present invention is not limited to a vehicle generator, it is an object of the present invention to provide a generator capable of improving cooling performance with a simple structure in view of the above problems. .

[0005]

According to a first aspect of the present invention, there is provided a frame, which is arranged in a rotor inside a frame and faces a cooling fan which rotates integrally with the rotor and a pulley which rotationally drives a drive shaft of the rotor. An inlet window is formed in the side wall portion for sucking cooling air by the rotation of the cooling fan into the frame, and a frame peripheral wall portion facing the outer peripheral surface side of the rotor. In a generator having a cooling mechanism composed of a discharge window for discharging the raised cooling air to the outside of the frame, in a frame portion between the suction window and the discharge window,
An annular hot air circumvention limiting portion is provided which protrudes from the pulley rear end surface side toward the pulley front end surface side and restricts the hot air discharged from the discharge window from going around to the suction window. Adopt a generator that does.

According to a second aspect of the present invention, there is provided the generator according to the first aspect, wherein the hot air wrap-around limiting portion projects at least 10 mm or more from an end surface of the discharge window on the pulley side of the discharge window. .

According to a third aspect of the present invention, the warm air circumvention limiting portion has a tip portion that projects from the pulley rear end surface in the axial direction and does not project from the pulley front end surface, and a maximum diameter portion that does not project in the radial direction from the frame peripheral wall portion. And a minimum diameter portion that does not protrude from the end surface of the suction window on the discharge window side in the radial direction, and the warm air circumvention limiting portion has a belt passing cutout portion through which the belt hung on the pulley passes. The generator according to claim 2 is adopted.

According to a fourth aspect of the present invention, there is provided the generator according to any one of the first to third aspects, wherein the warm air circumvention limiting portion is integrated with the frame side wall portion.

According to a fifth aspect of the present invention, there is provided the generator according to any one of the first to third aspects, wherein the warm air circumvention limiting portion is attached to the frame side wall portion.

According to a sixth aspect of the present invention, the cooling fan has a mixed flow blade, and the generator according to any one of the first to fifth aspects is adopted.

[0011]

In the generator according to the first aspect of the present invention, when the cooling fan rotates, the cooling air is sucked into the frame through the suction window, and the cooling air passes through the inside of the frame to become warm air, thereby forming the discharge window. Emitted from. The cooling air (warm air) discharged from the discharge window is restricted from flowing into the suction window by the warm air flow restricting portion. Therefore, the temperature of the cooling air sucked through the suction window hardly rises due to the hot air discharged through the discharge window, and therefore,
The inside of the frame can be cooled efficiently, improving the cooling performance.

In the generator according to the second aspect, when the warm air circumvention limiting portion is projected at least 10 mm or more from the pulley side end surface of the discharge window in the axial direction, the temperature of the outside air sucked through the suction window is lowered. It is based on an experimental example that the stator temperature is sufficiently lowered.

According to the third aspect of the generator, since the tip end portion of the hot air wraparound limit portion does not project from the pulley front end surface in the axial direction, and the maximum diameter portion does not project from the frame peripheral wall portion. The provision of the hot air circumvention limiting portion does not undesirably increase the size of the generator. In addition, since the minimum diameter portion does not protrude from the end surface of the suction window on the discharge window side, the provision of the hot air circumvention restriction portion reduces the amount of cooling air sucked into the suction window, thereby preventing the problem of impairing the cooling performance. . Further, the belt passed around the pulley is passed through the belt passage notch provided in the hot air circumvention limiting portion, and the belt can move smoothly without interfering with the warm air circumvention limiting portion.

In the generators according to claims 4 and 5, it is clarified that the warm air circumvention limiting portion may be integrated with the frame side wall portion or may be a separate type.

According to a sixth aspect of the present invention, there is provided a generator using a cooling fan having a mixed flow blade capable of efficiently cooling a rotor. According to this generator, the coolability of the generator can be further improved in combination with the improvement of the coolability of the rotor by the mixed flow blades.

[0016]

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a half sectional view and a front view of a vehicle generator according to an embodiment, respectively.

In FIGS. 1 and 2, the vehicle generator is
It is provided with a pair of left and right frames 1 and 1'which are substantially bowl-shaped and fixed to each other by tightening.

Inside the pair of frames 1, 1 ',
Stator core 2 fixed to the inner peripheral surface of one frame 1
A stator 2 including a and a stator coil 2b wound around the stator core 2a is provided.

A rotor 3 is arranged inside the stator 2. The rotor 3 is rotatably supported by a pair of bearings 4 (the right bearing is not shown in FIG. 1) provided in the central portions of the side walls 1a and 1b of the pair of frames 1 and 1 ', respectively. The drive shaft 3a, the pair of claw-shaped pole cores 3b and 3b 'fixed to the drive shaft 3a and the outer peripheral surface of which is arranged close to the inner peripheral surface of the stator core 2a, and the pair of claw-shaped pole cores 3b and 3b'. The rotor coil 3c is sandwiched on the inner circumference.

At one end of the drive shaft 3a, a pulley 5 is arranged so as to be sandwiched between a bearing 4, a washer 6 and a nut 7. Here, the washer 6 and the nut 7 may be integrated. A V-shaped groove 5 is formed on the outer peripheral surface of the pulley 5.
a is formed, a belt 8 driven by an engine (not shown) is hung on the pulley 5, and the pulley 5
Is rotatable by a belt 8.

Further, the generator has a cooling mechanism.
The cooling mechanism is disposed at both ends of the pair of claw-shaped pole cores 3b and 3b ', and faces the pair of cooling fans 9 and 9'rotating with the rotation of the drive shaft 3a and the pulley 5 of the one frame 1. A plurality of suction windows 10 are formed in the side wall portion 1a along the circumferential direction to allow the cooling air outside the frame 1 to be sucked into the inside of the frame 1 by the rotation of the cooling fan 9, and the peripheral wall portion 1c of the one frame 1. A plurality of discharge windows 11 formed along the direction for discharging the cooling air whose temperature has risen by passing through the inside of the frame 1 and a frame portion between the suction window 10 and the discharge window 11 are provided with pulleys. It is configured to have an annular hot air wrap-around restricting portion 12 that protrudes from the rear end surface 5b side toward the pulley front end surface 5c side.

Each of the pair of cooling fans 9 and 9 ′ has, in addition to a centrifugal blade, a mixed flow blade capable of guiding cooling air into the rotor 3 and cooling the rotor 3 efficiently.

The warm air circumvention restricting portion 12 is for restricting the warm air discharged from the discharge window 11 from flowing into the suction window 10, and protrudes from the pulley rear end surface 5b and the pulley front end surface 5c in the axial direction. Tip 1 that does not protrude further
2a, the maximum diameter portion 12b that does not protrude from the frame peripheral wall portion 1a in the radial direction, and the suction window 10 in the radial direction.
And a minimum diameter portion 12c that does not protrude from the discharge window side end surface 10a. In addition, the warm air circumvention limiting portion 12 is provided on the pulley 5
12d for passing the belt through which the belt 8 hung on the belt passes
This prevents the belt 8 from interfering with the hot air wrap-around restricting portion 12 and preventing the belt 8 from moving smoothly. The warm air circumvention limiting portion 12 may be integrated with the frame side wall portion 1a as in the present embodiment, or may be a separate body. For example, in the case of a separate body, the warm air circumvention limiting portion 12 is attached to the spoke portion 1d of the frame 1. May be.

Next, the operation of the cooling mechanism of the vehicle generator will be described.

When the belt 8 is driven and moved by the engine and the pulley 5 rotates, the drive shaft 3a rotates together with the pulley 5 and the cooling fan 9 rotates together with the drive shaft 3a. When the cooling fan 9 rotates, the suction window 1
Cooling air is drawn into the frame 1 through 0. The cooling air sucked into the frame 1 cools the stator 2,
The hot air is discharged from the discharge window 11. Further, a part of the cooling air is passed through the groove formed in the circumferential direction by the pair of claw pole cores 3b and 3b 'in the axial direction by the action of the mixed flow blades of the cooling fan 9 to cool the rotor 3. To do. Warm air discharged from the discharge window 11 is restricted from entering the suction window 10 by the warm air circumvention limiting unit 12. Therefore, the temperature of the cooling air sucked into the frame 1 through the suction window 10 hardly rises due to the warm air flowing into the suction window 10, and the stator 2 and the rotor 3 are efficiently cooled.

FIG. 3 shows the height h of the hot air wrap-around restricting portion 12.
An example of the relationship between (mm) and the stator temperature (° C) is shown. Here, the height h is a height based on the pulley-side end surface 11a of the discharge window 11. As is clear from FIG. 3, when the height h of the hot air circumvention limiting portion 12 is 10 mm or more, the stator temperature can be lowered, and more preferably, the height at which the belt passing notch portion 12d is required. That is, as described above, it has been found that it is preferable to set the tip portion 12a to a height equal to or more than the height at which the tip portion 12a projects from the pulley rear end surface 5c in the axial direction.

As described above, according to the vehicle generator of this embodiment, the warm air discharged from the discharge window 11 is
The warm air wraparound restricting portion 12 restricts wraparound to the suction window 10. Therefore, the temperature of the cooling air sucked through the suction window 10 hardly rises due to the hot air discharged through the discharge window 11, so that the inside of the frame 1 can be efficiently cooled and the cooling performance is improved. As shown in FIG. 3, when the height h of the warm air circumvention limiting portion 12 is set to be at least 10 mm or more, the stator temperature is sufficiently lowered, and more preferably, the hot air circulation limiting portion 12
It was found from the experimental results that the cooling performance is further improved when the front end portion 12a of the above is protruded from the pulley rear end surface 5b in the axial direction. Further, since the front end portion 12a of the warm air circumvention limiting portion 12 does not protrude from the pulley front end surface 5c, and the maximum diameter portion 12b of the warm air circumvention limiting portion 12 does not protrude from the frame peripheral wall portion 1a, the warm air circling limitation is limited. The provision of the portion 12 does not cause an undesired increase in size of the generator. In addition, the minimum diameter portion 12c is the suction window 10.
Since it does not project from the discharge window side end surface 10a, the provision of the warm air circumvention limiting portion 12 reduces the air volume of the cooling air sucked into the suction window 10 and does not impair the cooling performance. Further, the belt 8 notched by the belt 5 is passed through the belt passing notch 12d provided in the warm air circumvention limiting portion 12, and the belt 8 is the warm air circumvention limiting portion 12
Can move smoothly without interfering with. further,
Since the cooling fan 9 having the mixed flow blades capable of efficiently cooling the rotor 3 is used, the cooling performance of the generator can be further improved together with the improvement of the cooling performance of the rotor 3 by the mixed flow blades. it can.

The cross-sectional shape of the hot air circumvention limiting portion 12 is not limited to the shape shown in FIG. 1, but may be the shapes shown in FIGS. 4 and 5, respectively.

[Brief description of drawings]

FIG. 1 is a half sectional view of a vehicle generator according to an embodiment.

[Fig. 2] Front view of the generator

FIG. 3 is a graph showing the relationship between the height h of the hot air wraparound restriction portion and the stator temperature.

FIG. 4 is a modification of the hot air wraparound restriction unit.

[Fig. 5] Similarly, a modified example of the hot air wraparound restriction unit.

[Explanation of symbols]

 1, 1'frame 1a frame side wall part 1c frame peripheral wall part 1d spoke part 3 rotor 3a drive shaft 5 pulley 5b pulley rear end face 5c pulley front end face 8 belt 9 cooling fan 10 suction window 10a suction window discharge face side 11 discharge window 11a Pulley side end surface of the discharge window 12 Warm air wrapping restriction part 12a Tip of the hot air wrapping restriction part 12b Maximum diameter part of the hot air wrapping restriction part 12c Minimum diameter part of the hot air wrapping restriction part 12d Belt passage of the hot air wrapping restriction part Notch

Claims (6)

[Claims] 1. A cooling fan, which is disposed on a rotor inside a frame and rotates integrally with the rotor, and a side wall portion of the frame facing a pulley that rotationally drives a drive shaft of the rotor. A suction window for sucking the cooling air due to the rotation of the inside of the frame, and the frame peripheral wall portion facing the outer peripheral surface side of the rotor, and the cooling air whose temperature has risen by passing through the inside of the frame to the outside of the frame. In a generator having a cooling mechanism including a discharge window for discharging, in a frame portion between the suction window and the discharge window, projecting in a direction from a pulley rear end surface side to a pulley front end surface side,
A generator comprising an annular hot air circumvention limiting unit for limiting the circulation of warm air discharged from the discharge window into the suction window. 2. The warm air circumvention limiting portion is at least 10 m from the pulley-side end surface of the discharge window in the axial direction.
The generator according to claim 1, wherein the generator protrudes by m or more. 3. The warm air circumvention limiting portion has a tip portion that projects from the pulley rear end surface in the axial direction and does not project from the pulley front end surface, a maximum diameter portion that does not project in the radial direction from the frame peripheral wall portion, and a radius. A minimum diameter portion that does not protrude from the end surface of the suction window on the discharge window side in the direction, and the warm air circumvention limiting portion has a belt passing notch portion through which the belt hooked on the pulley passes. The generator described in 2. 4. The generator according to claim 1, wherein the hot air wraparound limiting portion is integrated with the frame side wall portion. 5. The warm air circumvention limiting portion is attached to the frame side wall portion.
The generator according to any one of 3. 6. The generator according to claim 1, wherein the cooling fan has a mixed flow blade.