JPH0223089Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Application Field In the present invention, a cooling fan is attached within the housing to a rotor rotatably supported by a housing, and the cooling fan is arranged approximately concentrically. surround in a shape,
The present invention relates to a rotating electrical machine in which a plurality of exhaust ports are provided at intervals in the circumferential direction on the cylindrical side wall portion of the housing.

(2) Prior Art Conventionally, in such rotating electric machines, the exhaust port has been provided by drilling the cylindrical side wall of the housing. is provided only at the lower part of the housing.

(3) Problems to be solved by the invention Since the exhaust port is provided only in the lower part of the housing, the opening area of the entire exhaust port has to be relatively small. Furthermore, the airflow collides with the inner surface of the side wall of the housing between the respective exhaust ports, and the turbulence of the airflow caused by the collision obstructs the discharge of air from the exhaust ports. As a result, air circulation by the cooling fan was suppressed, resulting in poor cooling efficiency.

The present invention has been developed in view of the above circumstances, and provides a rotating electrical machine that expands the range in which the exhaust port can be provided, increases the overall opening area, and improves cooling efficiency by making it possible to smoothly discharge airflow. The purpose is to provide

B. Structure of the invention (1) Means for solving the problem In order to achieve the above object, according to the invention, a cooling fan is attached within the housing to a rotor rotatably supported by a housing. In a rotating electrical machine in which a plurality of exhaust ports are provided at intervals in a circumferential direction on a cylindrical side wall of the housing that substantially concentrically surrounds a cooling fan, each of the exhaust ports is connected to the cylindrical side wall. It is arranged from the upper part to the lower part of the horizontal plane passing through the axis of the cooling fan, and is formed to be inclined toward the upstream side along the flow direction of the air flow generated in the housing by the rotation of the cooling fan. A guide portion is provided on the inner surface of the cylindrical side wall between the air ports, and the guide portion is provided to protrude and slope toward the upstream side along the flow direction in order to guide the air flow to each air exhaust port, and the guide portion is provided so as to protrude toward the upstream side along the flow direction. Each upper edge of the air outlet is provided with an eaves extending outward to cover the upper part of the air outlet.

(2) Effect By providing the eaves, it is possible to prevent rainwater from entering and provide the exhaust port in the upper part of the housing, thereby increasing the overall opening area of the exhaust port. Further, by providing the guide portion, the airflow generated by the rotation of the cooling fan can be smoothly guided and led to the exhaust port, resulting in smooth airflow.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG. Two brackets 3 and 4 are integrally connected with bolts 6 with an annular iron core 5 sandwiched between them. That is, ribs 7 and 8 are integrally provided on the outer surfaces of the first and second brackets 3 and 4 near their open ends at equal intervals, for example, 90 degrees in the circumferential direction. The rib 7 is provided with a screw hole 9 open to the second bracket 4 side, and the second bracket 4 is provided with an insertion hole 10, respectively. The bolt 6 is inserted into the insertion hole 10 from the second bracket 4 side, passes through the annular iron core 5, and is screwed into the screw hole 9. A coil 11 is attached to the annular core 5 within the housing 2.
is wound, thereby forming the stator 12.

A cylindrical bearing portion 13 is integrally provided on the end wall 3a of the first bracket 3.
Then, the rotary shaft 15 rotatably supported via the bearing 14 is thrust into the housing 2. An iron core 16 is fixed to a rotating shaft 15 within the housing 2, and a rotor 19 is configured by winding a coil 8 around the iron core 16 via a bobbin 17.

That is, a sleeve 20 having an iron core 16 fitted and fixed on its outer periphery is fitted into a portion of the rotating shaft 15 corresponding to the interior of the housing 2 . A coupling bolt 21 is inserted into this sleeve 20.
1 to the rotating shaft 15, the sleeve 20 is coupled to the rotating shaft 15.

The bobbin 17 is constructed by fitting together first and second halves 22 and 23 made of synthetic resin, and the iron core 16 is sandwiched between the first and second halves 22 and 23. This bobbin 17 is fitted into the sleeve 20,
It is fixed, and the coil 18 is further wound.

Referring also to FIG. 2, a cooling fan 24 is attached to the rotor 19. This cooling fan 24
is molded from synthetic resin, and the sleeve 20
It has a positioning boss part 25 in the center that is fitted into the boss part 25, and an enlarged head part which is divided into two and given elasticity is attached to the tip of the protrusion parts 26 which are protruded at equal intervals around the boss part 25. An engagement protrusion 28 having 27 is provided. On the other hand, the first half 22 of the bobbin 17 is provided with a locking hole 29 corresponding to each engagement protrusion 28, and the boss portion 25 is fitted into the sleeve 20 and the engagement protrusion 28 is engaged. The cooling fan 24 is attached to the rotor 19 by forcibly fitting it into the locking hole 29 and restoring the enlarged head 27 by its elasticity to engage the rim of the locking hole 29 .

The cooling fan 24 rotates together with the rotor 19 to air-cool the stator 12 and the rotor 19, and an air inlet 30 is provided in the end wall 4a of the second bracket 4. Further, a plurality of exhaust ports 31 are bored in the side wall of the housing 2 surrounding the cooling fan 24, that is, in the cylindrical side wall 3a of the first bracket 3, at intervals in the circumferential direction. These exhaust ports 31 are arranged not only below but also above a horizontal plane that includes the axis of the side wall 3a.
Furthermore, each exhaust port 31 is formed so as to be inclined toward the upstream side along the flow direction 32 of the air flow generated by the rotation of the cooling fan 24.

On the inner surface of the cylindrical side wall 3a between the respective exhaust ports 30, guide portions for guiding the air flow to the respective exhaust ports 30 are respectively provided protrudingly. Continuous guide passage 3
4 between them, and are inclined toward the upstream side along the flow direction 32.

Further, at least at the upper edge of each of the air exhaust ports 31 located above the horizontal plane including the axis of the cylindrical side wall 3a, an eaves portion 35 extending outward to cover the upper side of the air exhaust port 31 is provided. are arranged in succession. The lower surface of these eaves portions 35 is the exhaust port 31
It is connected smoothly to the inner surface of the upper part, and extends in different shapes depending on its position.

Next, to explain the operation of this embodiment, the rotation of the cooling fan 24 causes the inside of the housing 2 to
In particular, a rotating air flow is created within the first bracket 3,
The airflow is guided from the guide passage 34 to the exhaust port 31 and discharged. At this time, each guide part 33 forming the guide passage 34 extends toward the upstream side along the flow direction 32, and the guide passage 34 is connected to the exhaust port 31.
Since the airflow is smoothly connected to the airflow, the airflow is smoothly guided to the exhaust port 31 without disturbing the flow.

Furthermore, since each of the exhaust ports 31 is disposed not only at the bottom of the first bracket 3 but also above the horizontal plane including the axis of the first bracket 3, the exhaust ports 31
The overall opening area of the housing 2 is larger than that of the conventional housing 2, allowing a larger amount of air to flow into the housing 2.

Moreover, since the eaves portion 35 is connected to the upper edge of each of the exhaust ports 31 provided on the upper side of the housing 2,
Rainwater can be prevented from entering the housing 2.

C. Effects of the invention As described above, according to the invention, a cooling fan is attached within the housing to the rotor rotatably supported by the housing, and the cylindrical cylinder of the housing substantially concentrically surrounds the cooling fan. In a rotating electric machine in which a plurality of air exhaust ports are provided at intervals in the circumferential direction on a side wall, each of the air exhaust ports is
The cooling fan is disposed from the top to the bottom of a horizontal plane passing through the axis of the cylindrical side wall, and is formed to be inclined toward the upstream side along the flow direction of airflow generated within the housing by rotation of the cooling fan. , a guide portion is provided on the inner surface of the cylindrical side wall between the respective exhaust ports, the guide portion being inclined toward the upstream side along the flow direction in order to guide the air flow to each exhaust port, and the guide portion is provided at least above the horizontal plane. Since the upper edge of each of the air exhaust ports located at By arranging the exhaust ports in the housing, the overall opening area of the exhaust ports can be increased accordingly, and the guide portion can smoothly guide the airflow inside the housing to each exhaust port. As a result, the amount of air flowing through the cooling fan can be greatly increased, contributing to improvement in cooling efficiency. Further, even though some ventilation ports are provided in the upper half of the cylindrical side wall of the housing, rainwater is prevented from entering the ventilation ports by the eaves portion that covers the upper part of the ventilation ports. be able to.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view, and FIG. 2 is a side view of FIG. 1.
FIG. DESCRIPTION OF SYMBOLS 1...Motor generator as a rotating electric machine, 2...Housing, 3a...Cylindrical side wall, 19...Rotor, 24...Cooling fan, 31...Exhaust port, 33
...Guide section, 35...Eave section.

Claims (1)

[Scope of utility model registration request] Rotor 1 rotatably supported by housing 2
9, a cooling fan 24 is installed within the housing 2, and the cylindrical side wall 3a of the housing 2, which surrounds the cooling fan 24 in a substantially concentric manner, includes:
In a rotating electrical machine in which a plurality of exhaust ports 31 are provided at intervals in the circumferential direction, each of the exhaust ports 31
is disposed from the upper part to the lower part of the horizontal plane passing through the axis of the cylindrical side wall 3a, and is directed toward the upstream side along the flow direction 32 of the air flow generated within the housing 2 by the rotation of the cooling fan 24. The inner surface of the cylindrical side wall 3a is formed so as to be inclined, and the air flow is directed to the inner surface of the cylindrical side wall 3a between the respective exhaust ports 31.
A guide portion 33 that is inclined toward the upstream side along the flow direction 32 is provided to project from the upper side of the air outlet 31 at least on the upper edge of each air outlet 31 located above the horizontal plane. A rotating electrical machine characterized in that an eaves section 35 extending outward is provided in series to cover the machine.