JP2021052507A - Generator cooling structure - Google Patents

Abstract

To provide a generator cooling structure which can raise a cooling effect by a device of an injection hole for spraying oil to stator coils.SOLUTION: In a generator cooling structure having a plurality of injection holes (H1, H2) for injecting oil (O) and for spraying the oil (O) to a stator (38) of a generator (M) from one side surface side to be cooled, the stator (38) has a plurality of stator coils (50) adjacently arranged to form an annular shape in all. The injection holes (H1, H2) are arranged as a pair over boundaries between the stator coils (50) adjacent in view of a rotational axis direction of the generator (M) for every boundary. Injection directions by the pair of injection holes (H1, H2) are crossed with each other in view from the radially outside of the stator coils (50). The oil (O) to be injected from the injection holes (H1, H2) is sprayed to side surfaces (50a) facing between the adjacent stator coils (50).SELECTED DRAWING: Figure 8

Description

The present invention relates to a generator cooling structure, and more particularly to a generator cooling structure that cools a generator by injecting engine oil.

Conventionally, in order to cool a generator that rotates synchronously with the crankshaft of an engine, a generator cooling structure that injects engine oil onto the generator has been known.

Patent Document 1 describes an oil passage and a plurality of injection holes for pumping engine oil to a cover member covering the outside of the generator in the vehicle width direction in an inner rotor type generator attached to the outside of the crankcase of the engine in the vehicle width direction. The generator cooling structure is disclosed in which the engine oil is sprayed from the outside in the vehicle width direction toward the stator.

Japanese Patent No. 5604498

Here, in the configuration of Patent Document 1, by injecting oil toward the corners of the prismatic stator coil constituting the stator, the oil is applied to the two side surfaces of the stator coil to enhance the cooling effect. It has been done. However, in this configuration, it is difficult for oil to reach the back surface side of the stator coil, and there is still room for ingenuity in the configuration for further enhancing the cooling effect.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a generator cooling structure capable of enhancing a cooling effect by devising an injection hole for injecting oil into a stator coil.

In order to achieve the above object, the present invention has a plurality of injection holes (H1, H2) for injecting oil (O), and the oil is provided from one side surface side with respect to the stator (38) of the generator (M). In the generator cooling structure in which (O) is sprayed and cooled, the stator (38) has a plurality of stator coils (50) arranged adjacent to each other so as to form an annular shape as a whole, and the injection holes (H1). , H2) are arranged in pairs at each boundary between the stator coils (50) adjacent to each other in the direction of rotation of the generator (M), straddling the boundary, and the pair of injection holes (H1). , H2), the first feature is that the injection directions intersect with each other when viewed from the radial outside of the stator coil (50).

The second feature is that the oil (O) injected from the injection holes (H1 and H2) is sprayed onto the side surfaces (50a) facing each other between the adjacent stator coils (50). ..

Further, the third feature is that the axes (C1, C2) of the pair of injection holes (H1, H2) do not come into contact with each other.

Further, a cover member (40) for covering the generator (M) is provided, a groove-shaped oil passage (42) is formed in the cover member (40), and the injection holes (H1, H2) are formed in the cover member (40). The fourth feature is that it is a through hole formed in a plate-shaped lid member (60) that covers the groove-shaped oil passage (42).

Further, the fifth feature is that the lid member (60) has an annular shape in the direction of the rotation axis of the generator (M).

The sixth feature is that the pair of injection holes (H1, H2) are provided along a single circumference (F).

Further, the seventh feature is that the pair of injection holes (H1, H2) are provided so as not to follow a single circumference (F).

Further, the injection direction of the oil (O) by the injection holes (H1, H2) is upward except for the 90-degree position (R1) and the 270-degree position (R2) in the rotation axis direction view of the generator (M). At the 90-degree position (R1) and the 270-degree position (R2), the position and diameter of the stator coil (50) are closer to the inside in the radial direction due to the pair of injection holes (H1 and H2) in the vertical direction. The eighth feature is that oil (O) is injected at both positions closer to the outside in the direction.

According to the first feature, it has a plurality of injection holes (H1, H2) for injecting oil (O), and oil (O) is injected from one side surface side with respect to the stator (38) of the generator (M). In the generator cooling structure for spraying and cooling, the stator (38) has a plurality of stator coils (50) arranged adjacent to each other so as to form an annular shape as a whole, and the injection holes (H1, H2) are formed. A pair of stator coils (50) adjacent to each other in the direction of rotation of the generator (M) are arranged in pairs across the boundary, and the pair of injection holes (H1, H2) are used. Since the injection directions intersect each other when viewed from the radial outside of the stator coil (50), the oil injected by each of the two paired injection holes is on the opposite side across the boundary between the stator coils. It is possible to spray on the stator coil of. As a result, the oil can be sprayed toward the side surfaces facing each other between the adjacent stator coils. As a result, the side surface of the stator coil can be cooled, and the oil reaches the back surface of the stator coil by the force of injection, so that the cooling effect on the back surface side can be enhanced.

According to the second feature, the oil (O) injected from the injection holes (H1, H2) is sprayed onto the side surfaces (50a) facing each other between the adjacent stator coils (50). The side surface of the stator coil can be cooled, and the oil reaches the back surface side of the stator coil due to the force of injection, so that the cooling effect on the back surface side can be enhanced.

According to the third feature, since the axes (C1 and C2) of the pair of injection holes (H1 and H2) do not come into contact with each other, the injected oils do not interfere with each other and the oil is placed in a desired place. Can be sprayed.

According to the fourth feature, the cover member (40) for covering the generator (M) is provided, and a groove-shaped oil passage (42) is formed in the cover member (40), and the injection hole (H1) is provided. , H2) is a through hole formed in the plate-shaped lid member (60) that covers the groove-shaped oil passage (42), so that it is easy to make a hole in the plate-shaped lid member with a drill or the like. It is possible to provide injection holes by processing.

According to the fifth feature, since the lid member (60) has a ring shape in the direction of the rotation axis of the generator (M), all the stators arranged in a ring shape. It is possible to spray oil on the coil. Further, by increasing the rigidity of the lid member, it is possible to maintain the strength even if the injection hole is provided.

According to the sixth feature, since the pair of injection holes (H1, H2) are provided along a single circumference (F), the radial position where the injection holes are provided is fixed. Therefore, the process of providing the injection hole becomes easy. In this case, the axes of the injection holes can be made different from each other so that the axes do not come into contact with each other.

According to the seventh feature, since the pair of injection holes (H1, H2) are provided so as not to follow a single circumference (F), even if the axial angles of the injection holes are the same, The axes can be configured so that they do not touch each other.

According to the eighth feature, the injection directions of the oil (O) by the injection holes (H1, H2) are the 90-degree position (R1) and the 270-degree position (R2) in the rotation axis direction of the generator (M). ), And at the 90-degree position (R1) and 270-degree position (R2), the stator coil (50) is radially driven by the pair of injection holes (H1, H2) in the vertical direction. Since the oil (O) is injected into both the position closer to the inside and the position closer to the outer side in the radial direction, among the plurality of stator coils arranged in a ring, the position above the rotation axis is the stator coil. By spraying oil toward the outer side in the radial direction and spraying oil toward the inner side in the radial direction of the stator coil at a position below the rotation axis, the oil adhering to the stator coil drips downward due to gravity. Therefore, the entire stator coil can be cooled efficiently. On the other hand, at the 90-degree position and the 270-degree position, the two injection holes are arranged one above the other, so that the respective injection holes directly inject oil toward the inner side in the radial direction and the outer side in the radial direction to the stator coil. The whole can be cooled efficiently.

It is a left side view of the motorcycle which applied the generator cooling structure which concerns on one Embodiment of this invention. It is a front view of a generator. It is a perspective view of a stator coil. It is a perspective view which looked at the cover member which covers a generator from the back side. It is a front view of a lid member. It is a front view which shows the positional relationship between a generator and a lid member. FIG. 6 is a cross-sectional view taken along the line VII-VII of FIG. It is a schematic diagram which shows the relationship between the injected oil and a stator coil. It is a schematic diagram which shows the axial direction of the injection hole when the lid member is seen from the rotation axis direction of a generator. It is a schematic diagram which concerns on the modification of the injection hole. It is a schematic diagram which concerns on the 2nd modification of the injection hole. It is a conceptual diagram which shows the use example of the pattern of an injection hole.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a left side view of a motorcycle 1 to which a generator cooling structure according to an embodiment of the present invention is applied. The body frame 4 of the motorcycle 1 as a saddle-mounted vehicle has a pair of left and right main frames 5 extending rearward and downward from the head pipe 9. The steering system of the front wheel WF, which is swingably supported by the head pipe 9, consists of a pair of left and right front forks 15 that pivotally support the front wheel WF by the axle 17, and a top bridge that clamps the front forks 15 above and below the head pipe 9. 8 and a bottom bridge 11 and a steering stem (not shown) that connects the top bridge 8 and the bottom bridge 11 to each other and is pivotally supported by a head pipe 9. A steering handle 6 is fixed to the upper part of the front fork 15.

A pair of left and right pivot frames 20 that support the pivot 19 that swingably supports the swing arm 23 are connected to the rear end portion of the main frame 5. A power unit P in which a V-type 4-cylinder engine E and a transmission are integrally formed is fixed below the main frame 5 and in front of the pivot frame 20. The combustion gas of engine E is guided to the muffler on the right side in the vehicle width direction via the exhaust pipe. The driving force of the engine E is rotatably supported by the rear end of the swing arm 23 on the axle 24 via the endless drive chain 26 wound around the drive sprocket 18 fixed to the output shaft. It is transmitted to the WR.

A front cowl 10 provided with a windbreak screen 7 is arranged in front of the head pipe 9. A pair of left and right side cowls 28 covering the side of the vehicle body are connected to the rear part of the front cowl 10 covering the front of the vehicle body, and an under cowl 21 covering the lower part of the power unit P is connected to the lower end of the side cowl 28. There is.

The front fender 14 that covers the upper part of the front wheel WF is fixed to the front fork 15. A tank cover 2 that covers the upper part of the fuel tank 31 and the air cleaner box 3 is attached to the upper part of the main frame 5. A rear cowl 29 is arranged behind the seat 30 attached to the tank cover 2, and the rear fender 27 covering the upper part of the rear wheel WR is fixed to the upper part of the swing arm 23.

The swing arm 23 is suspended from the vehicle body frame 4 by a rear cushion 32 arranged behind the pivot 19. On the outside of the main frame 5 in the vehicle width direction, a pair of left and right air ducts 13 for guiding the outside air are arranged below the air cleaner box 3. The air guide pipe 13 passes through the outside of the front fork 15 in the vehicle width direction, gathers in front of the head pipe 9, and is connected to the intake opening 12 provided in the center of the front cowl 10 in the vehicle width direction. A radiator 22 is arranged in front of the vehicle body of the engine E, and a vertically long oil cooler 39 is arranged below the radiator 22 which is long in the vehicle width direction.

A generator M driven by the rotational power of the crankshaft C is provided on the left side of the V-shaped engine E having two cylinders on the front side and two cylinders on the rear side in the vehicle width direction. The rotation axis CO of the generator M coincides with the rotation axis center of the crankshaft C directed in the vehicle width direction. The outside of the generator M in the vehicle width direction is covered with a cover member 40 attached to the crankcase.

FIG. 2 is a front view of the generator M. Further, FIG. 3 is a perspective view of the stator coil 50. The generator M according to the present embodiment is an inner rotor type in which a rotor 36 fixed to an end of a crankshaft C is arranged inside an annular stator 38 housed in a case 35. The stator 38 has a configuration in which a total of 12 stator coils 50 are arranged adjacent to each other in the circumferential direction. The stator coil 50 is configured by covering a tooth 51 of a stator core made of laminated metal plates with an insulator 53 around which a metal winding 52 is wound. The straight lines L1 to L6 shown in FIG. 2 are drawn every 30 degrees in the rotation direction so as to pass through the boundary between the adjacent stator coils 50 and the rotation axis CO of the generator M.

FIG. 4 is a perspective view of the cover member 40 covering the generator M as viewed from the back surface side. Further, FIG. 5 is a front view of the lid member 60, and FIG. 6 is a front view showing the positional relationship between the generator M and the lid member 60.

An oil passage 42 formed of a substantially annular groove is formed on the back surface side of the cover member 40, and by covering the oil passage 42 with the lid member 60, the oil pumped by the oil pump passes through the sealed oil passage 42. The passage is constructed. The lid member 60 has fastening members (not shown) in the through holes 62 formed in the three flange portions that bulge outward in the radial direction and the through holes 63 formed in the three flange portions that bulge inward in the radial direction. ), And screwed into a plurality of female screw holes 43, 44 provided in the cover member 40 to be fixed to the cover member 40.

The plate-shaped lid member 60 having a substantially annular shape is formed with oil injection holes H1 and H2 at positions corresponding to the straight lines L1 to L6 shown in FIG. 2, respectively. That is, a pair of injection holes H1 and H2 are arranged at the boundary between the adjacent stator coils 50, respectively. The distances from each straight line to the injection holes H1 and H2 are symmetrically set to be equal, and all the injection holes H1 and H2 are provided along a single circumference F. In the present embodiment, the injection holes H1 and H2 are set to be located substantially at the center of the radial dimension of the stator coil 50.

Further, in the present embodiment, since the lid member 60 has a ring shape when viewed in the direction of the rotation axis of the generator M, oil is sprayed onto all the stator coils 50 arranged in a ring shape. It is possible to attach it. The ring shape enhances the rigidity of the lid member 60, and the strength of the lid member 60 can be maintained even if the injection holes H1 and H2 are provided.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. The injection holes H1 and H2 are formed so as to be inclined so that the outlet side (generator side) of the oil is closer to the boundary between the stator coils 50 than the oil inlet side (cover member side). Specifically, the axis C1 of the injection hole H1 and the axis C2 of the injection hole H2 are inclined by predetermined angles α and β with respect to the rotation axis CO of the generator M, respectively. Since the injection holes H1 and H2 are through holes formed in the plate-shaped lid member 60, the injection holes H1 and H2 can be formed by a simple process of making a hole in the lid member 60 with a drill or the like.

FIG. 8 is a schematic view showing the relationship between the injected oil O and the stator coil 50. This figure shows a state of the generator M viewed from the outside in the radial direction, corresponding to the cross-sectional view of FIG. 7. The generator cooling structure according to the present embodiment is characterized in that the injection directions of the pair of injection holes H1 and H2 intersect each other when viewed from the radial outside of the stator coil 50. As a result, the oil O injected by each of the two paired injection holes can be sprayed onto the stator coils 50 on the opposite side across the boundary between the stator coils 50, and the adjacent stator coils 50 can be sprayed from each other. Oil O can be sprayed toward the side surfaces 50a facing each other. As a result, the side surface 50a of the stator coil 50 can be cooled, and the oil O reaches the back surface 50b of the stator coil 50 with the force of injection, so that the cooling effect on the back surface side can be enhanced.

In the present embodiment, although the axes C1 and C2 intersect when viewed from the outside in the radial direction, by adjusting the axial directions so that they do not come into contact with each other, the injected oil O does not interfere with each other and is desired. It is possible to spray oil O on the place.

FIG. 9 is a schematic view showing the axial directions of the injection holes H1 and H2 when the lid member 60 is viewed from the rotation axis direction of the generator M. This figure shows a state in which the K portion surrounded by a broken line in FIG. 8 is viewed from the case member 40 side in the direction of the rotation axis. Further, the inlet side of the injection holes H1 and H2 is shown by a solid line, and the outlet side is shown by a broken line.

In the present embodiment, the inlet side is provided along a single circumference F, while the inclination angles of the axes C1 and C2 are configured to be different from each other. With this configuration, the position on the outlet side is asymmetrical, and it is possible to prevent the injected oil O from interfering with each other without contacting the axis C1 and the axis C2, and to inject the oil O at a desired location. ..

Here, a configuration in which both the axes C1 and C2 are inclined toward the outer peripheral side of the generator M with respect to the horizontal plane is defined as "pattern A". On the other hand, a configuration in which both the axes C1 and C2 are inclined toward the center of the generator M with respect to the horizontal plane is defined as "pattern B". An example of using each pattern will be described with reference to FIG.

FIG. 10 is a schematic view relating to a modified example of the injection holes H1 and H2. Similar to FIG. 9, the inlet side of the injection holes H1 and H2 is shown by a solid line, and the outlet side is shown by a broken line. In this modification, both inlet sides are provided along a single circumference F, while on the outlet side, the axis C1 of the injection hole H1 is inclined downward in the drawing, and the axis C2 of the injection hole H2 is upward in the drawing. It is configured to tilt. With this configuration as well, it is possible to prevent the injected oil O from interfering with each other and to inject the oil O at a desired location without the axis C1 and the axis C2 coming into contact with each other.

Here, the configuration of the injection holes H1 and H2 described above is defined as "pattern C". An example of using this pattern will also be described with reference to FIG.

FIG. 11 is a schematic view of the second modification of the injection holes H1 and H2. Similar to FIG. 9, the inlet side of the injection holes H1 and H2 is shown by a solid line, and the outlet side is shown by a broken line. In this second modification, the pair of injection holes H1 and H2 are provided so as to be offset in the vertical direction without following a single circumference F. In this configuration, even if the inclination angles of the axes C1 and C2 are symmetrical, it is possible to prevent the injected oil O from interfering with each other.

FIG. 12 is a conceptual diagram showing an example of using the patterns of the injection holes H1 and H2. It is preferable that the injection direction of the oil O to be sprayed on the stator coil 50 is changed at each part in consideration of the fact that the oil drips downward due to gravity. In the example of this figure, the pattern A shown in FIG. 9 is applied to the position above the rotation axis CO. As a result, the oil is sprayed toward the outer side in the radial direction of the stator coil 50 so that the oil drips downward to cool the entire stator coil 50. Specifically, when the boundary position between adjacent stator coils 50 is set clockwise every 30 degrees, the pattern A is applied to the positions of 0 degrees, 30 degrees, 60 degrees, 300 degrees, and 330 degrees. ..

Further, the pattern B shown in FIG. 9 is applied to the position below the rotation axis CO. As a result, the oil is sprayed toward the inside of the stator coil 50 in the radial direction so that the oil drips downward to cool the entire stator coil 50. Specifically, the pattern B is applied to the positions of 120 degrees, 150 degrees, 180 degrees, 210 degrees, and 240 degrees.

Then, the pattern C shown in FIG. 10 is applied to the 90-degree position (R1) and the 270-degree position (R2) where the two injection holes H1 and H2 are arranged one above the other. If pattern A or pattern B is applied to the 90-degree position (R1) and the 270-degree position (R2), even if the oil drips due to gravity, the oil will not adhere to either the radial inward side or the radial outward side. However, in the pattern C, the injection holes H1 and H2 can directly inject oil into both the radial inward side and the radial outward side of the stator coil 50. As a result, the entire stator coil 50 can be efficiently cooled. It should be noted that the pattern C may be applied so that the top and bottom of the pattern C are reversed at the 90-degree position and the 270-degree position. Further, the offset type injection holes shown in FIG. 11 may be applied to the 90 degree position and the 270 degree position.

As described above, according to the generator cooling structure according to the present invention, the stator 38 has a plurality of stator coils 50 arranged adjacent to each other so as to form an annular shape as a whole, and the injection holes H1 and H2 are generators. A pair of stator coils 50 adjacent to each other in the direction of rotation axis of M are arranged across the boundary, and the injection direction by the pair of injection holes H1 and H2 is the radial outside of the stator coil 50. Since they intersect each other when viewed from the viewpoint, it is possible to inject the oil injected by each of the two paired injection holes H1 and H2 onto the stator coils 50 on the opposite side across the boundary between the stator coils 50. It becomes. As a result, the side surface 50a of the stator coil 50 can be cooled, and the oil reaches the back surface 50b of the stator coil 50 with the force of injection to enhance the cooling effect on the back surface side.

The form of the motorcycle, the shape and structure of the generator, the number of stator coils, the shape and material of the cover member and the lid member, the position of the injection hole, the diameter of the injection hole, the axis angle, etc. are not limited to the above embodiments. , Various changes are possible. For example, in the above-described embodiment, the three injection hole patterns are applied to the annular stator, but injection holes having different patterns may be arranged at each boundary between the stator coils. The generator cooling structure according to the present invention is not limited to the generator attached to the engine of the motorcycle, and in addition to the inner rotor type generator, the electric generator which doubles as the generator and the motor, and the drive of the electric vehicle. It can be applied to various motors such as motors for use.

1 ... motorcycle, E ... engine, P ... power unit, M ... generator, 38 ... stator, 40 ... cover member, 42 ... oil passage, 60 ... lid member, 50 ... stator coil, 50a ... side surface of stator coil, 50b ... Back surface of stator coil, H1, H2 ... Injection hole, C1, C2 ... Axial line, F ... Circumference, R1 ... 90 degree position, R2 ... 270 degree position

On the back surface side of the cover member 40, an oil passage 42 formed of a substantially annular groove formed between the outer annular convex portion 41 and the inner annular convex portion 43 is formed, and the lid member is formed in the oil passage 42. By closing the lid with 60, a closed passage through which the oil pumped by the oil pump passes is constructed. The lid member 60 has fastening members (not shown) in the through holes 62 formed in the three flange portions that bulge outward in the radial direction and the through holes 63 formed in the three flange portions that bulge inward in the radial direction. ), And screwed into a plurality of female screw holes 44 , 45 provided in the cover member 40 to be fixed to the cover member 40.

In the present embodiment , although the axes C1 and C2 intersect when viewed from the radial outside of the generator M , the injected oil O interferes with each other by adjusting the axial directions so as not to contact each other. It is possible to spray the oil O at a desired place.

Claims (8)

Generator cooling that has a plurality of injection holes (H1, H2) for injecting oil (O) and injects oil (O) from one side surface side onto the stator (38) of the generator (M) to cool it. In the structure
The stator (38) has a plurality of stator coils (50) arranged adjacent to each other so as to form an annular shape as a whole.
The injection holes (H1, H2) are arranged in pairs at each boundary between the stator coils (50) adjacent to each other in the rotation axis direction of the generator (M), straddling the boundary.
A generator cooling structure characterized in that the injection directions of the pair of injection holes (H1, H2) intersect each other when viewed from the radial outside of the stator coil (50). The first aspect of claim 1, wherein the oil (O) injected from the injection holes (H1 and H2) is sprayed onto the side surfaces (50a) facing each other between the adjacent stator coils (50). Generator cooling structure. The generator cooling structure according to claim 1 or 2, wherein the axis lines (C1, C2) of the pair of injection holes (H1, H2) do not come into contact with each other. A cover member (40) for covering the generator (M) is provided.
A groove-shaped oil passage (42) is formed in the cover member (40).
Claims 1 to 3, wherein the injection holes (H1 and H2) are through holes formed in a plate-shaped lid member (60) that covers the groove-shaped oil passage (42). The generator cooling structure described in either. The generator cooling structure according to claim 4, wherein the lid member (60) has an annular shape in the direction of rotation of the generator (M). The generator cooling structure according to any one of claims 1 to 5, wherein the pair of injection holes (H1, H2) are provided along a single circumference (F). The generator cooling structure according to any one of claims 1 to 5, wherein the pair of injection holes (H1, H2) are provided so as not to follow a single circumference (F). The injection direction of the oil (O) by the injection holes (H1 and H2) is inclined upward except for the 90 degree position (R1) and the 270 degree position (R2) in the rotation axis direction view of the generator (M). And
At the 90-degree position (R1) and the 270-degree position (R2), the position of the stator coil (50) is closer to the inner side in the radial direction and the position closer to the outer side in the radial direction due to the pair of injection holes (H1 and H2) in the vertical direction. The generator cooling structure according to any one of claims 1 to 7, wherein oil (O) is injected into both of the above.

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