CN112583207A

CN112583207A - Motor cooling structure

Info

Publication number: CN112583207A
Application number: CN202011038193.1A
Authority: CN
Inventors: 杉浦广之; 北胁俊辅; 大森康平
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2019-09-30
Filing date: 2020-09-28
Publication date: 2021-03-30
Also published as: DE102020125213A1; JP2021058009A; JP7007341B2

Abstract

The invention provides a motor cooling structure which has a simple structure and can spray attached oil throughout the whole circumference of a motor to effectively cool the motor. The motor cooling structure cools a motor (M) provided in a power unit (P), and is provided with a plurality of injection holes (70) for injecting oil from a rotation axis (CO) of the motor (M) to the radially outer side. A plurality of oil passages (71, 72) communicating with the injection hole (70) are provided radially from the center side of the motor (M) toward the radial outer side. Oil passages (71, 72) are formed in a cover member (40) that covers the outside of the motor (M). The oil passages (71, 72) communicate with the oil reservoir (48a) inside the mounting boss (60) to which the stator (50) is mounted, and extend radially outward. The oil passages (71, 72) are constituted by a second oil passage (72) of a large diameter and a first oil passage (71) of a smaller diameter than the second oil passage (72) which are communicated with each other on the same axis.

Description

Motor cooling structure

Technical Field

The present invention relates to a motor cooling structure, and more particularly to a motor cooling structure for cooling a motor by discharging and adhering engine oil to the motor.

Background

Conventionally, there is known a motor cooling structure for discharging engine oil to an electric motor that rotates in synchronization with a crankshaft of an engine in order to cool the electric motor.

Patent document 1 discloses a generator cooling structure in which an oil passage for pressure-feeding engine oil and a plurality of injection holes are formed in a cover member covering the outside of a crankcase of an engine in a vehicle width direction in a generator as an outer rotor type motor mounted on the outside of the crankcase in the vehicle width direction, and the engine oil is sprayed and attached to the generator from the outside in the vehicle width direction.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-57112

Disclosure of Invention

Problems to be solved by the invention

However, the structure of patent document 1 is a structure in which the adhesion oil is discharged to a part of the generator through three injection holes, and there is still room for study in a structure for further improving the cooling effect.

An object of the present invention is to solve the above-described problems of the prior art and to provide a motor cooling structure that has a simple structure and can effectively cool a motor by discharging adhering oil over the entire circumference of the motor.

Means for solving the problems

In order to achieve the above object, a first feature of the present invention is an electric motor cooling structure for cooling an electric motor (M) provided in a power unit (P), the electric motor cooling structure including a plurality of injection holes (70) for injecting oil from a rotation axis (CO) of the electric motor (M) radially outward, wherein a plurality of oil passages (71, 72) communicating with the injection holes (70) are provided radially outward from a center side of the electric motor (M).

In addition, the second characteristic is that the oil passages (71, 72) are formed in a cover member (40) that covers the outside of the motor (M).

In addition, a third characteristic is that a mounting boss (60) to which a stator (50) of the motor (M) is attached is formed on the cover member (40), an oil reservoir (48a) is formed inside the mounting boss (60), and the oil passages (71, 72) communicate with the oil reservoir (48 a).

A fourth characteristic is that the oil passages (71, 72) are formed by a second oil passage (72) having a larger diameter and communicating with each other on the same axis, and a first oil passage (71) having a smaller diameter than the second oil passage (72).

Further, a fifth characteristic is that the electric motor (M) has a stator (50) and an outer rotor (55) that rotates outside the stator (50), and oil is injected toward the stator (50) through the injection holes (70).

Effects of the invention

According to the first feature, in the motor cooling structure for cooling the motor (M) provided in the power unit (P), since the plurality of injection holes (70) for injecting the oil from the rotation axis (CO) of the motor (M) to the radially outer side are provided, and the plurality of oil passages (71, 72) communicating with the injection holes (70) are provided radially from the center side of the motor (M) to the radially outer side, the oil is injected radially from the center side of the motor to the radially outer side, and the cooling effect by the oil can be obtained over the entire circumference of the motor.

According to the second feature, since the oil passages (71, 72) are formed in the cover member (40) that covers the outside of the electric motor (M), the electric motor can be cooled by applying the cover member provided with the oil passages without changing the power unit side such as the crankcase.

According to the third feature, since the mounting boss 60 to which the stator 50 of the motor M is attached is formed in the cover member 40, the oil reservoir 48a is formed in the mounting boss 60, and the

oil passages

71 and 72 communicate with the oil reservoir 48a, the oil reservoir is provided, thereby preventing pressure fluctuation of oil and performing stable injection. Further, the space efficiency can be improved by providing the oil reservoir by the mounting boss formed on the cover member.

According to the fourth aspect, since the oil passages (71, 72) are formed by the second oil passage (72) having a large diameter and the first oil passage (71) having a smaller diameter than the second oil passage (72), which are communicated with each other on the same axis, the pressure of the oil can be increased by the first oil passage having a small diameter and connected to the second oil passage, and the oil can be injected to a desired position.

According to the fifth feature, since the electric motor (M) has a stator (50) and an outer rotor (55) that rotates outside the stator (50), and oil is injected toward the stator (50) through the injection holes (70), the annular stator can be cooled over the entire circumference by the oil injected radially.

Drawings

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.

Fig. 2 is a front view of the cover member.

Fig. 3 is a side view of the cover member as viewed from the front side of the vehicle body.

Fig. 4 is a rear view of the cover member.

Fig. 5 is a rear view of the cover member with the stator removed from the state of fig. 4.

Fig. 6 is an enlarged perspective view of the mounting boss.

Fig. 7 is a sectional view taken along line VII-VII of fig. 2.

Fig. 8 is a partially enlarged view of fig. 7.

Fig. 9 is a perspective view of the section along line IX-IX of fig. 3 as viewed from a position substantially at the rear of the vehicle body.

Description of the reference numerals

1 … motorcycle, 40 … cover component, 41 … main body part, 47 … large diameter bolt, 48a … oil storage part, 50 … stator, 55 … outer rotor, 60 … mounting boss, 70 … jet hole, 71 … first oil path, 72 … second oil path, P … power unit, M … generator, CO … rotation axis center

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying 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. The body frame 4 of the motorcycle 1 as a saddle riding type vehicle includes 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 pivotally supported on the head pipe 9 in a swingable manner includes a pair of left and right front forks 15 pivotally supporting the front wheel WF by an axle 17, a top bridge 8 and a bottom bridge 11 sandwiching the front forks 15 above and below the head pipe 9, and a steering column (not shown) pivotally supporting the head pipe 9 by connecting the top bridge 8 and the bottom bridge 11 to each other. A steering handle 6 is fixed to an upper portion of the front fork 15.

A pair of left and right pivot frames 20 supporting pivot shafts 19 are connected to rear end portions of the main frame 5, and the pivot shafts 19 pivotally support swing arms 23. A power unit P having a V-type 4-cylinder engine E and a transmission integrally formed is fixed below the main frame 5 and in front of the pivot frame 20. The combustion gas of the engine E is introduced into the muffler on the right side in the vehicle width direction via the exhaust pipe. The driving force of the engine E is transmitted to a rear wheel WR rotatably supported at the rear end of the rocker arm 23 via an axle 24 via an endless power transmission chain 26 wound around a drive sprocket 18 fixed to an output shaft.

A front cowl 10 having a windshield 7 is disposed in front of the head pipe 9. A pair of left and right side cowls 28 covering the sides of the vehicle body are connected to the rear portion of the front cowl 10 covering the front of the vehicle body, and a lower cowl 21 covering the lower portion of the power unit P is connected to the lower end portion of the side cowls 28.

A front fender 14 covering an upper portion of the front wheel WF is fixed to the front fork 15. A tank cover 2 is attached to an upper portion of the main frame 5 to cover an upper portion of the fuel tank 31 and the air cleaner box 3. A rear cowling 29 is disposed behind a seat 30 attached to the tank cover 2, and a rear fender 27 covering the upper portion of the rear wheel WR is fixed to the upper portion of the rocker arm 23.

The swing arm 23 is suspended from the vehicle body frame 4 by a rear shock absorber 32 disposed rearward of the pivot shaft 19. A pair of left and right air guide pipes 13 for guiding outside air toward the lower portion of the air cleaner box 3 are disposed on the vehicle width direction outer sides of the main frame 5. The air guide duct 13 merges forward of the head pipe 9 through the outside of the front fork 15 in the vehicle width direction, and is connected to an air intake opening 12 provided at the center of the front cowl 10 in the vehicle width direction. A radiator 22 is disposed at the front of the vehicle body of the engine E, and an oil cooler 39 that is longitudinally long is disposed below the radiator 22 that is long in the vehicle width direction.

A generator M as a motor driven by the rotational power of the crankshaft C is provided on the left side in the vehicle width direction of a V-shaped engine E having a front side 2 cylinder and a rear side 2 cylinder. 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 vehicle width direction outer side of the generator M is covered by a cover member 40 attached to the crankcase.

Fig. 2 is a front view of the cover member 40. Fig. 3 is a side view of the cover member 40 as viewed from the front side of the vehicle body. The cover member 40 covering the left side of the generator M in the vehicle width direction is fixed to the crankcase of the engine E by a plurality of fastening members such as bolts penetrating the flange portion 43. The main body 41 of the cover member 40 is an integrally molded member made of metal such as aluminum or magnesium. A harness outlet 44 through which a harness (not shown) connected to the generator M is inserted is formed in a position above a substantially circular main body 41 covering the generator M, and the extension portion 42 is connected to a lower portion of the main body 41.

A through hole 48 coaxial with the rotation axis CO of the generator M is formed substantially at the center of the body 41, and a large-diameter bolt 47 having a hexagonal head is screwed into a female thread cut in the inner peripheral surface of the through hole 48.

An oil passage 46a is formed in a position forward and downward of the large-diameter bolt 47, the oil passage 46a guides oil pumped by an oil pump to the center of the cover member 40, and a cylindrical protrusion 46 for securing a thickness around the oil passage 46a is provided outside the oil passage 46 a.

Fig. 4 is a rear view of the cover member 40. The figure shows a state in which the stator 50 is fixed to the back surface side of the cover member 40. Fig. 5 is a rear view of the cover member 40 with the stator 50 removed from the state of fig. 4.

The stator 50 fixed to the rear surface of the cover member 40 has a total of 18 stator coils 51. The stator 50 is fixed to a mounting boss 60 protruding toward the back surface side of the cover member 40 by three fastening members 52 made of bolts or the like. Three fastening holes 61 into which the fastening members 52 are screwed are formed at 120-degree intervals in the mounting bosses 60. An outer rotor 55 rotating in synchronization with the crankshaft C is disposed radially outside the stator 50.

Fig. 6 is an enlarged perspective view of the mounting boss 60. The mounting boss 60 is formed in a shape in which a bulging portion 60a having a fastening hole 61 is provided from the outer circumferential surface of a cylindrical body having a large thickness toward the outer side in the radial direction. An oil reservoir 48a is provided on the inner periphery of the through hole 48. Further, injection holes 70 for injecting engine oil are formed in the outer peripheral surface of the mounting boss 60 at positions corresponding to the respective stator coils 51.

The generator cooling structure of the present invention is characterized in that the oil pumped to the oil reservoir 48a through the oil passage 46a is radially injected through the radially arranged injection holes 70, and is uniformly injected and attached to each stator coil 51.

Fig. 7 is a sectional view taken along line VII-VII of fig. 2. As described above, the stator 50 is fixed to the mounting boss 60, and the outer rotor 55 is fixed to the crankshaft C. An end of the crankshaft C is inserted into the through hole 48, and a substantially cylindrical space, i.e., an oil reservoir 48a, is formed between the end of the crankshaft C and the large-diameter bolt 47. The injection holes 70 communicate with the oil reservoir 48 a.

Fig. 8 is a partially enlarged view of fig. 7. The oil reservoir 48a has a predetermined shape by attaching the cover member 40 to the crankcase and screwing the large-diameter bolt 47 to the cover member 40. The injection hole 70 is an outlet hole of a first oil passage 71 having a circular cross section. A second oil passage 72 having a larger diameter than the first oil passage 71 is formed on the upstream side of the first oil passage 71. The upstream side of the second oil passage 72 communicates with the oil reservoir 48a, and the inner circumferential surface of the oil reservoir 48a is formed with 18 inlet holes of the second oil passage 72 at 20-degree intervals.

The first oil passage 71 and the second oil passage 72 communicate with each other on the same axis, and both have the same inclination angle with respect to the vertical plane. The first oil passage 71 and the second oil passage 72 can be configured, for example, by forming the second oil passage 72 with a drill having a large diameter from the inner peripheral side of the oil reservoir 48a and then forming the first oil passage 71 with a drill having a small diameter. According to the configuration of the first oil passage 71 and the second oil passage 72, the pressure of the oil is increased by the first oil passage 71 having a small diameter, and the oil can be injected to a desired position. In the present embodiment, the lengths of the second oil passages 72 are the same, and the length of the first oil passage 71 differs from portion to portion depending on the thickness of the side wall of the mounting boss 60.

In the present embodiment, by providing the oil reservoir 48a connected to the first oil passage 71 and the second oil passage 72, it is possible to prevent pressure fluctuations of oil and perform stable injection. Further, since the oil reservoir 48a is provided by the mounting boss 60 formed on the cover member 40, space efficiency is improved.

Fig. 9 is a perspective view of the section along line IX-IX of fig. 3 as viewed from a position slightly rearward of the vehicle body. According to the first oil passage 71, the second oil passage 72, and the injection holes 70 of the present invention, oil can be radially injected from the rotation axis CO of the generator M to the outside in the radial direction, and the oil can be injected to each stator coil 51. This can provide a cooling effect by the oil over the entire circumference of the stator 50.

The form of the motorcycle, the shape and structure of the generator and the cover member, the shape of the mounting boss of the cover member, the number of stator cores of the stator, the diameters and lengths of the first and second oil passages, the angles of the first and second oil passages with respect to the vertical plane, the number and arrangement intervals of the injection holes, and the like are not limited to the above-described embodiments, and various modifications are possible. For example, although the above embodiment has been described using an outer rotor type generator, the present invention may be applied to an inner rotor type generator. The generator cooling structure of the present invention is not limited to the generator mounted on the motorcycle, and can be applied to various generators, and can also be applied to a motor generator that is an electric motor functioning as both a generator and a motor, and various motors that are electric motors such as a driving motor of an electric vehicle.

Claims

1. A motor cooling structure for cooling a motor (M) provided in a power unit (P),

a plurality of injection holes (70) for injecting oil from the rotation axis (CO) of the motor (M) to the radial outside,

a plurality of oil passages (71, 72) communicating with the injection hole (70) are provided radially from the center side of the motor (M) toward the radially outer side.

2. The motor cooling structure according to claim 1,

the oil passages (71, 72) are formed in a cover member (40) that covers the outside of the motor (M).

3. The motor cooling structure according to claim 1 or 2,

a mounting boss (60) for mounting a stator (50) of the motor (M) is formed on the cover member (40),

an oil reservoir (48a) is formed inside the mounting boss (60),

the oil passages (71, 72) communicate with the oil reservoir (48 a).

4. The motor cooling structure according to any one of claims 1 to 3,

the oil passages (71, 72) are constituted by a second oil passage (72) of a large diameter and a first oil passage (71) of a smaller diameter than the second oil passage (72) which are communicated with each other on the same axis.

5. The motor cooling structure according to any one of claims 1 to 4,

the motor (M) has a stator (50) and an outer rotor (55) rotating outside the stator (50),

injecting oil toward the stator (50) through the injection hole (70).