JP7423668B2 - Electric motor cooling structure and straddle-type vehicle - Google Patents

Description

The present invention relates to a motor cooling structure and a straddle-type vehicle, and more particularly to a motor cooling structure and a straddle-type vehicle that cool the electric motor by spraying engine oil thereon.

Conventionally, a motor cooling structure has been known in which engine oil is sprayed onto the motor in order to cool the motor that rotates synchronously with the crankshaft of the engine.

Patent Document 1 discloses that in an outer rotor electric motor that is attached to the outside of the crankcase of an engine in the vehicle width direction, an oil passage for pumping engine oil and a plurality of injection holes are formed in a cover member that covers the outside of the electric motor in the vehicle width direction. However, a motor cooling structure is disclosed in which engine oil is sprayed toward the generator from the outside in the vehicle width direction.

Japanese Patent Application Publication No. 2021-136751

However, in Patent Document 1, since the oil passage of the cover member is formed by machining such as a drill, the shape of the oil passage is likely to be restricted, and the number of parts such as gaskets and seal bolts is increased. There was a problem that the weight easily increased.

It is an object of the present invention to provide a motor cooling structure and a straddle-type vehicle that can solve the problems of the prior art described above, increase the degree of freedom in the shape of oil passages, and reduce the number of parts of the cover member to reduce the weight. Our goal is to provide the following.

In order to achieve the above object, the present invention provides an electric motor cooling structure that injects oil to an electric motor (M) provided in a power unit (P) to cool the electric motor (M). 60, 70) are formed in a cover member (40) that covers the electric motor (M) from the outside, and the oil passage (60, 70) is formed in a hollow hole provided in the integrally molded cover member (40). The first feature is that it consists of parts.

A second feature is that the oil passages (60, 70) include curved portions.

A third feature is that one wall of the hollow portion constituting the oil passage (60, 70) is formed of the outer surface of the cover member (40).

The oil passages (60, 70) include a first oil passage (60) for injecting oil to the generator (M), and at least a first oil passage (60) for injecting oil to the rotating shaft (C) of the generator (M). a second oil passage (70) for supplying the oil, the rotating shaft (C) is oriented in the vehicle width direction, and the first oil passage (60) and the second oil passage (70) A fourth feature is that the vehicle has an intersection (80) that overlaps in the vehicle width direction.

Further, the intersection (80) is configured such that a part of the second oil passage (70) overlaps the outer side in the vehicle width direction of the circular road (61) included in the first oil passage (60). has a fifth characteristic.

Further, the first oil passage (60) and the second oil passage (70) have parallel portions (100) that are parallel to each other on the upstream side of the intersection portion (80), and the parallel portion (100) A sixth feature is that the first oil passage (60) and the second oil passage (70) share an outer wall portion.

Furthermore, a seventh feature is that the cross-sectional area of the second oil passage (70) is larger than the cross-sectional area of the first oil passage (60).

An eighth feature is that at least a portion of the second oil passage (70) has an oval cross section.

A ninth feature is that the second oil passageway (70) has an oval cross section that is elongated in the vehicle width direction.

Further, the second oil passage (70) includes an arc-shaped outer circumferential passage (73) having an oval cross section, and the outer circumferential passage (73) is arranged at a circumferential edge of the cover member (40) on the inner side in the vehicle width direction. The tenth feature lies in the fact that it is formed along.

Furthermore, an eleventh feature is that the present invention is a straddle type vehicle having the electric motor cooling structure according to claim 1.

According to the first feature, in the motor cooling structure that cools the electric motor (M) by injecting oil to the electric motor (M) provided in the power unit (P), the oil passage (60, 70) through which the oil passes is provided. is formed in a cover member (40) that covers the electric motor (M) from the outside, and the oil passage (60, 70) is formed of a hollow part provided in the integrally molded cover member (40). In addition, the degree of freedom in the shape of the oil passage is increased, and the number of parts of the cover member can be reduced to reduce the weight.

According to the second feature, since the oil passages (60, 70) include curved portions, smooth oil flow can be realized by the oil passages including the curved portions.

According to the third feature, one wall of the hollow portion constituting the oil passage (60, 70) is formed of the outer surface of the cover member (40), so that the outer surface of the cover member is By using it as a wall on one side of the oil passage, the weight of the cover member can be reduced.

According to the fourth feature, the oil passage (60, 70) includes a first oil passage (60) for injecting oil to the generator (M), and at least a rotating shaft of the generator (M). (C), the rotating shaft (C) is oriented in the vehicle width direction, and the first oil passage (60) and the second oil passage Since the oil passageway (70) has the intersection part (80) overlapping with the oil passageway in the vehicle width direction, the degree of freedom in designing the oil passageway can be ensured by providing the intersection part.

According to the fifth feature, the intersection (80) is a part of the second oil passage (70) located outside in the vehicle width direction of the circular road (61) included in the first oil passage (60). Because of the overlapping configuration, the degree of freedom in the layout of the annular path included in the first oil path is increased, and it becomes possible to supply oil smoothly.

According to the sixth feature, the first oil passage (60) and the second oil passage (70) have parallel portions (100) that are parallel to each other on the upstream side of the intersection (80), In the parallel portion (100), the first oil passage (60) and the second oil passage (70) share an outer wall portion, so by sharing the outer wall portion, the wall thickness can be reduced and the cover member can be reduced in thickness. Weight reduction can be achieved.

According to the seventh feature, since the cross-sectional area of the second oil passage (70) is larger than the cross-sectional area of the first oil passage (60), by increasing the cross-sectional area of the second oil passage, the rotation It becomes easy to supply the amount of oil necessary for lubrication of the shaft.

According to the eighth feature, since at least a portion of the second oil passage (70) has an oval cross section, the cover member can be made more compact while ensuring the cross-sectional area of the oil passage. .

According to the ninth feature, since the oval cross section of the second oil passage (70) is an oval long in the vehicle width direction, the rigidity of the cover member in the bolt tightening direction is ensured, and the cover member and It is possible to improve the sealing performance with the crankcase.

According to the tenth feature, the second oil passage (70) includes an arc-shaped outer circumferential passage (73) having an oval cross section, and the outer circumferential passage (73) is arranged in the outer circumference of the cover member (40). Since it is formed along the inner circumferential edge in the width direction, by arranging the outer circumferential path along the circumferential edge of the cover member, it is possible to suppress unevenness of the cover member and realize smooth oil flow. Become.

According to the eleventh feature, since the straddle-type vehicle has the electric motor cooling structure according to claim 1, the degree of freedom in the shape of the oil passage is increased, and the number of parts of the cover member is reduced to reduce the weight. It becomes possible to obtain a straddle-type vehicle that can achieve the following.

FIG. 1 is a left side view of a motorcycle to which a motor cooling structure according to an embodiment of the present invention is applied. It is a perspective view of a cover member. FIG. 3 is a right side view of the cover member. FIG. 3 is a rear view of the cover member. FIG. 3 is a transparent perspective view of the cover member. FIG. 3 is a transparent front view of the cover member. FIG. 3 is a transparent right side view of the cover member. 7 is a sectional view taken along line VIII-VIII in FIG. 6. FIG. FIG. 3 is a cross-sectional view showing the configuration of an outer circumferential path. 7 is a sectional view taken along line XX in FIG. 6. FIG. 7 is a sectional view taken along the line XI-XI in FIG. 6. FIG.

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 motor cooling structure according to an embodiment of the present invention is applied. A body frame 4 of a motorcycle 1 as a straddle-type vehicle has a pair of left and right main frames 5 extending rearward and downward from a head pipe 9. The steering system of the front wheel WF that is pivotally supported by the head pipe 9 includes a pair of left and right front forks 15 that pivotally support the front wheel WF by an axle 17, and a top bridge that clamps the front fork 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 the 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 a pivot 19 that swingably supports a swing arm 23 are connected to the rear end of the main frame 5 . A power unit P is fixed below the main frame 5 and in front of the pivot frame 20. The power unit P includes a V-type 4-cylinder engine E and a transmission. Combustion gas from engine E is guided to the muffler on the right side in the vehicle width direction through the exhaust pipe. The driving force of the engine E is transmitted to a rear wheel rotatably supported by an axle 24 at the rear end of a swing arm 23 via an endless drive chain 26 wound around a drive sprocket 18 fixed to an output shaft. It is transmitted to WR.

A front cowl 10 including a windbreak screen 7 is disposed in front of the head pipe 9. A pair of left and right side cowls 28 that cover the sides of the vehicle are connected to the rear part of the front cowl 10 that covers the front of the vehicle. An under cowl 21 that covers the lower part of the power unit P is connected to the lower end of the side cowl 28.

A front fender 14 that covers the upper part of the front wheel WF is fixed to a front fork 15. A tank cover 2 that covers the tops of the fuel tank 31 and the air cleaner box 3 is attached to the top of the main frame 5. A rear cowl 29 is arranged behind the seat 30 attached to the tank cover 2, and a rear fender 27 that covers 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 wind guide pipes 13 are arranged to guide outside air to the lower part of the air cleaner box 3. The air guide pipes 13 pass through the outside of the front fork 15 in the vehicle width direction, gather in front of the head pipe 9, and are connected to an intake opening 12 provided at the center of the front cowl 10 in the vehicle width direction. A radiator 22 is disposed in front of the engine E, and a longitudinally elongated oil cooler 39 is disposed below the radiator 22, which is elongated in the vehicle width direction.

A generator M as an electric motor driven by the rotational power of a crankshaft C is housed on the left side of the engine E in the vehicle width direction. The rotation axis CO of the generator M coincides with the rotation center of the crankshaft C, which is a rotation axis oriented in the vehicle width direction. The outer side of the generator M in the vehicle width direction is covered by a cover member 40 attached to the crankcase of the engine E.

FIG. 2 is a perspective view of the cover member 40. 3 is a right side view of the cover member 40, and FIG. 4 is a rear view of the cover member 40. The cover member 40 that is attached to the crankcase of the engine E and covers the outside of the generator M in the vehicle width direction is an integrally molded product manufactured using a 3D printer or the like. The cover member 40 has a bowl-shaped main body portion 41 that covers the generator M, and a downwardly extending portion 42 that extends below the main body portion 42 .

Nine bosses 45 are provided on the periphery of the cover member 40, through which bolts 44 for attaching the cover member 40 to the crankcase pass. A rib 43 in which six plate-like members extend radially is formed in the center of the main body part 41 in correspondence with the center of the crankshaft C, and a through hole for the starter shaft is formed in the center of the downwardly extending part 42. A hole 48 is formed. A first bulge 51 and a second bulge 52 are formed between the rib 43 and the through hole 48, which extend from the front side of the cover member 40 toward the center of the rib 43.

The first bulging portion 51 is configured as an outer wall portion of a first oil passage 60 formed inside the cover member 40, and the second bulging portion 52 is configured as an outer wall portion of a first oil passage 60 formed inside the cover member 40. 70 (see FIG. 5). Three wiring holes 49 are formed on the rear side surface of the downward extending portion 42 for taking out the wiring 50 of the stator coil that constitutes the generator M. A third bulge 46 and a fourth bulge 47 for forming an outlet of the second oil passage 70 are arranged adjacent to the two bosses 45 located at the rear upper part of the cover member 40 .

A total of nine oil injection holes 63 are formed on the back side of the cover member 40 and are annularly arranged at equal intervals. The first oil passage 60 includes an annular passage 61 along the arrangement of the oil injection holes 63 and a first supply passage 62 that supplies oil to the annular passage 61. A fifth bulge 90 in which the inlet hole 62a of the first oil passage 60 is formed and a sixth bulge part 90 in which the inlet hole 73a of the second oil passage 70 is formed are located at a lower front position of the cover member 40. A section 91 is provided. On the other hand, outlet holes 73b and 73c of the second oil passage 70 are formed in the third bulging part 46 and the fourth bulging part 47 located at the upper side of the cover member 40, respectively.

A stator boss 53 for fixing the stator coil of the generator M is formed on the back side of the cover member 40. An oil reservoir 72 for lubricating the crankshaft C with oil introduced from the second oil passage 70 is provided at the center of the stator boss 53.

FIG. 5 is a transparent perspective view of the cover member 40. 6 is a transparent front view of the cover member 40, and FIG. 7 is a transparent right side view of the cover member 40. As described above, the first oil passage 60 (colored gray in the figure) includes the annular passage 61 in which the oil injection hole 63 (see FIG. 4) is provided, and the first supply passage 62 that supplies oil to the annular passage 61. It consists of. Further, the second oil passage 70 includes a second supply passage 71 that supplies oil to the oil reservoir 72 and an arcuate outer peripheral passage 73 formed along the front side periphery of the cover member 40 .

In the first oil passage 60, oil introduced from the crankcase side through the inlet hole 62a is supplied to the annular passage 61 through the first supply passage 62 and is injected from the oil injection hole 63. . In addition, in the second oil passage 70, oil introduced from the crankcase side through the inlet hole 73a is supplied to the oil reservoir portion 72 through the second supply passage 71, and is also supplied to the outer circumferential passage 73. The liquid is discharged from the outlet holes 73b and 73c.

In this embodiment, since the first oil passage 60 and the second oil passage 70 are formed from hollow parts provided in the cover member 40, the degree of freedom in the shape of the oil passage is increased and the number of parts of the cover member 40 is reduced. This makes it possible to reduce the weight. Further, since the first oil passage 60 and the second oil passage 70 each have a curved portion, smooth oil flow can be realized. The first oil passage 60 has a shape in which the first supply passage 60 rises linearly from the inlet hole 62a and changes its angle at one point toward the annular portion 61. The entire circular path 61 is composed of a curved line. In the second oil passage 70, the second supply passage 71 rises linearly from the inlet hole 73a, changes its angle toward the intersection 80, and then passes through the intersection 80, which is curved as a whole, to the oil reservoir 72. Concatenated. The entire outer circumferential path 73 is composed of a curved line.

Moreover, in this embodiment, the annular path 61 of the first oil passage 60 and the second supply passage 71 of the second oil passage 70 have an intersection 80 where they overlap in the vehicle width direction. By providing the intersection 80, flexibility in designing the oil passage can be ensured. Furthermore, at the intersection 80, the second supply paths 71 are arranged so as to straddle the outside of the circular path 61 in the vehicle width direction and overlap with each other. As a result, it is possible to save space for the oil passage, and the degree of freedom in layout of the annular passage 61 is increased, making it possible to supply oil smoothly. On the other hand, the second supply path 71 has no portion that intersects with the first oil path 60 except for the portion overlapping with the annular portion 61 . This minimizes the occurrence of intersections 80 and simplifies the structure.

Further, in this embodiment, the first supply passage 62 of the first oil passage 60 and the second supply passage 71 of the second oil passage 70 have a parallel portion 100 that is parallel to each other on the upstream side of the intersection portion 80. In this parallel portion 100, the first bulging portion 51 and the second bulging portion 52 are connected and shared, that is, the outer wall portions of the first supply path 62 and the second supply path 71 are shared. becomes. This makes it possible to reduce the thickness of the cover member 40 by sharing the outer wall portion, thereby making it possible to reduce the weight of the cover member 40.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 6. A wall on one side of the hollow portion constituting the first oil passage 60 and the second oil passage 70 is constituted by the outer surface of the cover member 40. Thereby, by using the outer surface of the cover member 40 as a wall on one side of the oil passage, it is possible to reduce the weight of the cover member 40.

As described above, the oil introduced from the second supply path 71 of the second oil path 70 is supplied to the oil reservoir 72 formed in the stator boss 53. The cross-sectional area of the second supply path 71 is set larger than the cross-sectional area of the first oil path 60. This makes it easy to supply the amount of oil necessary for lubrication of the crankshaft C.

The second supply passage 71 of the second oil passage 70 has the same circular cross section as the first supply passage 62 and the annular passage 61 of the first oil passage 60 . On the other hand, the outer circumferential passage 73 of the second oil passage 70 has an oval cross section that is long in the vehicle width direction. This makes it possible to make the cover member 40 more compact while increasing the cross-sectional area of the outer circumferential path 73. Furthermore, since the oval cross section of the outer circumferential passage 73 is an oval long in the vehicle width direction, the rigidity of the cover member 40 in the tightening direction of the bolts 44 is ensured, and the sealing performance between the cover member 40 and the crankcase is improved. becomes possible.

FIG. 9 is a cross-sectional view showing the configuration of the outer circumferential path 73. The outer peripheral path 73 of the second oil passage 70 has an oval cross section that is long in the vehicle width direction, and is formed along the inner circumferential edge of the cover member 40 in the vehicle width direction. This makes it possible to suppress unevenness of the cover member 40 and realize smooth oil flow. The oil supplied to the crankcase side from the outlet hole 73b of the outer circumferential passage 73 is used to lubricate the piston, and the oil supplied to the crankcase side from the outlet hole 73c is used to lubricate the transmission.

FIG. 10 is a sectional view taken along the line XX in FIG. 6. At the intersection 80 where the circular path 61 and the second supply path 71 form a two-level structure in the vehicle width direction, and at the parallel section 100 where the first supply path 62 and the second supply path 71 are arranged close to each other in parallel. , their outer walls will be shared. Thereby, the thickness of the cover member 40 can be reduced and the weight of the cover member 40 can be reduced.

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 6. The inlet hole 73a portion of the second supply path 71 has an undercut shape in which a first enlarged diameter portion 85 and a second enlarged diameter portion 86 having a larger diameter than the inlet hole 73a are formed. This allows oil to be introduced from the crankcase side more smoothly.

Note that the form of the motorcycle, the shape and structure of the cover member, the method of manufacturing the cover member, the shapes of the first oil passage and the second oil passage, the positions of intersections and parallel parts, etc. are not limited to the above embodiments, and may be modified in various ways. can be changed. The structure of the cover member according to the present invention is not limited to motorcycles, but can be applied to straddle-type tricycles and four-wheel vehicles.

DESCRIPTION OF SYMBOLS 1... Motorcycle, 40... Cover member, 60... 1st oilway (oilway), 61... Circular path, 70... 2nd oilway (oilway), 80... Intersection, 100... Parallel part, 73... Outer circumferential path, C...crankshaft (rotating shaft), P...power unit, M...electric motor

Claims (11)

In a motor cooling structure that injects oil to an electric motor (M) provided in a power unit (P) to cool the electric motor (M),
The oil passage (60, 70) through which the oil passes is formed in a cover member (40) that covers the electric motor (M) from the outside,
The oil passage (60, 70) is formed of a hollow part provided in the integrally molded cover member (40),
The oil passages (60, 70) include a first oil passage (60) for injecting oil to the electric motor (M), and a first oil passage (60) for supplying oil to at least the rotating shaft (C) of the electric motor (M). a second oil passage (70);
The second oil passage (70) includes an arcuate outer peripheral passage (73) having an oval cross section,
The outer peripheral path (73) is formed along a peripheral edge of the cover member (40) on the inner side in the vehicle width direction,
In the second oil passage (70), oil introduced from the crankcase side through the inlet hole (73a) passes through the second supply passage (71), lubricates the crankshaft, and flows through the outer peripheral passage (73). A motor cooling structure characterized in that the motor cooling structure is supplied through the outlet holes (73b, 73c) to the crankcase side. The motor cooling structure according to claim 1, wherein the oil passage (60, 70) includes a curved portion. The motor cooling structure according to claim 1 or 2, wherein a wall on one side of the hollow portion constituting the oil passage (60, 70) is constituted by an outer surface of the cover member (40). . The rotation axis (C) is oriented in the vehicle width direction,
The motor cooling structure according to any one of claims 1 to 3, wherein the first oil passage (60) and the second oil passage (70) have an intersection (80) where they overlap in the vehicle width direction. . The intersection (80) is characterized in that a portion of the second oil passage (70) overlaps the outer side in the vehicle width direction of the circular road (61) included in the first oil passage (60). The electric motor cooling structure according to claim 4. The first oil passage (60) and the second oil passage (70) have parallel portions (100) that are parallel to each other on the upstream side of the intersection portion (80),
The motor cooling structure according to claim 5, wherein the first oil passage (60) and the second oil passage (70) share an outer wall portion in the parallel portion (100). The motor cooling structure according to any one of claims 4 to 6, wherein a cross-sectional area of the second oil passage (70) is larger than a cross-sectional area of the first oil passage (60). The motor cooling structure according to any one of claims 4 to 7, wherein at least a portion of the second oil passage (70) has an oval cross section. The motor cooling structure according to claim 8, wherein the second oil passage (70) has an oval cross section that is elongated in the vehicle width direction. A straddle-type vehicle comprising the electric motor cooling structure according to claim 1. 10. The motor cooling structure according to claim 1, wherein the oil supplied from the outlet holes (73b, 73c) to the crankcase side is used for lubricating the piston and the transmission.

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