JP2003061325A - Internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool the stator of a generator or a motor provided in an internal combustion engine effectively while preventing oscillation of the level of oil stored in an oil pan. SOLUTION: A stator S produced by winding a coil 25 around a laminated core 24 of steel plates is secured to bearing caps 14b and 14d for supporting a crankshaft 17 in conjunction with a cylinder block and a rotor R produced by securing a plurality of permanent magnets 22 to the outer circumference of a disc 21 provided in the crankshaft 17 is set to face the inner circumference of the stator S thus constituting a motor GM. Three steel plates 24a-24c out of a plurality of steel plates constituting the core 24 of the stator S are extended in the horizontal direction to form radiation fins 24d also serving as a baffle plate. Consequently, the stator S having a temperature raised through heating of the coil 25 is cooled while suppressing oscillation of the level of oil in an oil pan 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes a stator, in which a coil is wound around a core made of laminated steel plates, to a bearing cap that rotatably supports a crankshaft in cooperation with a cylinder block. The present invention relates to an internal combustion engine in which a generator or an electric motor in which a rotor having a plurality of permanent magnets fixed to the outer circumference is opposed to the inner circumference of a stator is arranged in an upper space of an oil pan provided below a cylinder block.

[0002]

2. Description of the Related Art An internal combustion engine equipped with such a generator or electric motor has already been proposed by the present applicant in Japanese Patent Application No. 2001-003093. In this generator or electric motor, a plurality of permanent magnets fixed to the outer peripheral portion of the balance weight provided on the shaft end of the journal of the crankshaft and a peripheral surface of the bearing cap supporting the journal are arranged so as to face the permanent magnets. It is composed of multiple fixed coils.By energizing the coils, it can function as an electric motor to assist the output of the internal combustion engine.In addition, the crankshaft is rotated by the output of the internal combustion engine or external force to generate electricity. It can function as a machine to generate electricity.

[0003]

By the way, when the generator or the electric motor functions, the coil heats up and the temperature of the stator rises. However, since the above-mentioned conventional one does not have a special stator cooling means, the temperature of the stator is increased. The rise could affect the functionality or durability of the generator or motor. Further, generally, in a wet sump type internal combustion engine, it is necessary to provide a baffle plate in order to prevent the oil surface of the oil stored in the oil pan from swinging, which causes a problem of increasing the number of parts.

The present invention has been made in view of the above circumstances, and effectively cools the stator of a generator or an electric motor provided inside an internal combustion engine and prevents the oil level of oil stored in an oil pan from swaying. The purpose is to do.

[0005]

In order to achieve the above object, according to the invention described in claim 1, a stator in which a coil is wound around a core in which steel plates are laminated is cooperated with a cylinder block to form a crank. A generator or an electric motor, in which a shaft is fixed to a bearing cap that rotatably supports and a rotor having a plurality of permanent magnets fixed to the outer circumference of a crankshaft web is opposed to the inner circumference of a stator, is provided below a cylinder block. In the internal combustion engine arranged in the upper space of the oil pan, there is proposed an internal combustion engine characterized in that a radiator fin is provided on a core of a stator.

According to the above construction, since the radiator fins are provided on the core of the stator which constitutes the generator or the electric motor in cooperation with the rotor provided on the crankshaft, the electric generator or the electric motor operates to heat the coil. At this time, the heat of the coil is released from the heat radiation fins provided on the core, so that the stator can be effectively cooled and the generator or the electric motor can be surely functioned.

Further, according to the invention described in claim 2,
In addition to the structure of claim 1, there is proposed an internal combustion engine characterized in that a heat radiation fin provided on a core of a stator constitutes a baffle plate of an oil pan.

According to the above construction, since the radiation fin constitutes the baffle plate of the oil pan, the radiation fin is also used as the baffle plate to prevent shaking of the oil stored in the oil pan without providing a special baffle plate. can do.

According to the invention described in claim 3,
In addition to the structure of claim 1 or claim 2, an internal combustion engine is proposed in which a part of a steel plate forming a core of a stator is extended to form a heat radiation fin.

According to the above construction, since the radiating fin is constructed by extending a part of the steel plate of the core of the stator, a special member for constructing the radiating fin is not required, and the number of parts and the number of assembling steps are reduced. Reduction is possible.

According to the invention described in claim 4,
In addition to the structure according to any one of claims 1 to 3, an internal combustion engine is proposed in which a plurality of steel plates are superposed to form a heat radiation fin.

According to the above structure, since the heat radiation fin is formed by stacking a plurality of steel plates, the rigidity of the heat radiation fin can be sufficiently increased.

The generator motor GM of the embodiment corresponds to the generator or the motor of the present invention, and the disc 21 of the embodiment corresponds to the web of the present invention.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an internal combustion engine, and FIG. 2 is 2-2 of FIG.
FIG. 3 is a sectional view taken along the line, and FIG.

The in-line four-cylinder internal combustion engine E of this embodiment is mounted on a hybrid vehicle, and has four generator motors GM ... Which function as electric motors and generators inside. The internal combustion engine E includes a cylinder block 11, a cylinder head 12 connected to the upper surface of the cylinder block 11 with bolts (not shown), a crankcase 14 connected to the lower surface of the cylinder block 11 with bolts 13 and a lower surface of the crankcase 14. And an oil pan 16 connected by bolts 15 ...

The crankshaft 17 is provided with five journals 18a to 18e and four crankpins 19a to 19d located between them, and the axial inner end of the # 1 journal 18a and # 5. A total of four balance weights 20 are integrally provided at the inner end of the journal 18e in the axial direction and both ends of the # 3 journal 18c in the axial direction. These four balance weights 20 ... Are the # 1 journal 18a, # 3 journal 18c and # 5 journal 1
It is formed in a fan shape that requires 8e (see FIG. 2). See also
2 journal 18b both axial ends, and # 4 journal 1
A total of four discs 21 ... Are integrally provided at both axial ends of 8d. A plurality of (for example, 12) permanent magnets 22 are provided on the outer circumferences of these four discs 21 ..., and the discs 21 and the permanent magnets 22 on the outer periphery thereof form the rotor R of the generator motor GM. Constitute.

The cylinder block 11 is integrally formed with five journal supporting portions 11a to 11e, and five bearing caps 14a to 14e integrally formed with the crankcase 14 and the five journal supporting portions. 1
Five journals 18a to 18e of the crankshaft 17 are rotatably supported between the shafts 1a to 11e. # 2 journal 18b and # 4 journal 18
Two bearing caps 14b, 14d for supporting d
Is the other three bearing caps 14a, 14c, 1
It is larger than 4e and is formed in a semicircular shape.

Four generator motors GM are provided on both side surfaces of the two semicircular bearing caps 14b and 14d.
The stator S of ... Is provided. As is apparent from FIG. 2, the crank pin 1 of one bearing cap 14b
The stator S of the generator motor GM provided on the 9c side is wound around the core 24 having a substantially circular arc shape in which a large number of steel plates are superposed and fixed to the bearing cap 14b with the bolts 23, and the inner circumference of the core 24. It is composed of a plurality of (for example, 9) coils 25. These multiple coils 25
The outer circumferences of the plurality of permanent magnets 22 of the rotor R are opposed to the inner circumference of ... With a slight gap.

Of the four generator motors GM, the two generator motors GM, GM on the inner side in the axial direction have a stator S structure different from that of the two generator motors GM, GM on the outer side in the axial direction. That is, the two generator motors GM on the inner side in the axial direction,
Of the many steel plates that make up the GM cores 24, 24,
A predetermined number (for example, three) of steel plates 24a-24
The c is bent inward in the axial direction so as to approach each other to form the radiation fin 24d.

4 stored inside the cylinder block 11
Pistons 27 are slidably fitted in the cylinder bores 26, respectively, and the four pistons 27 are connected to the four crank pins 19a to 19d by connecting rods 28, respectively. Combustion chambers 29, which face the top surfaces of the pistons 27, are formed on the lower surface of the cylinder head 12.

The oil pump 30 housed in the oil pan 16 comprises a pump housing 31, a pump rotor 32 housed in the pump housing 31, and a pump shaft 33 rotatably supporting the pump rotor 32. The driven sprocket 34 provided at the shaft end of the pump shaft 33 protruding from the pump housing 31 is the drive sprocket 3 provided at the shaft end of the crankshaft 17.
5 through an endless chain 36. A strainer housing 37 that covers the pump rotor 32 in cooperation with the pump housing 31 extends along the bottom wall of the oil pan 16, and a strainer 38 is provided at the tip of the strainer housing 37.

Therefore, the rotation of the crankshaft 17 is
It is transmitted to the pump shaft 33 via the drive sprocket 35, the endless chain 36, and the driven sprocket 34, and rotates the pump rotor 32 integrated with the pump shaft 33. As a result, the oil stored in the oil pan 16 is drawn into the oil pump 30 from the strainer 38 through the inside of the strainer housing 37, and is supplied to each part of the internal combustion engine E from there.

Next, the operation of the first embodiment of the present invention having the above construction will be described.

When the internal combustion engine E is operated, the crankshaft 17 rotates, and the four balance weights 20 ...
Primary vibration associated with the reciprocating motion of 7 ... Is reduced. At this time,
The four balance weights 20 provided on the axial inner end of the # 1 journal 18a, the axial inner end of the # 5 journal 18e, and the axial both ends of the # 3 journal 18c are:
Since the pistons 27 are evenly arranged corresponding to the four pistons 27, it is possible to exert an effective vibration damping effect while minimizing the weight of the balance weights 20.

# 1 journal 1 of crankshaft 17
8a to # 5 Of the axial end portions of the journal 18e, portions where the balance weights 20 ... Are not provided, that is, #
2 journal 18b both axial ends, and # 4 journal 1
A plurality of permanent magnets 22 fixed to the outer circumference of a total of four discs 21 provided at both axial ends of 8d, and a coil 2 fixed to both side surfaces of two bearing caps 14b and 14d.
Since four generator-motors GM ... are composed of 5 and ..., When the vehicle starts and accelerates, power is supplied to the coils 25 from a power storage means (not shown) including a battery and a capacitor, so that the generator-motor GM ... To function as an electric motor to assist the output of the internal combustion engine E. Further, if the generator motors GM ... Are made to function as electric motors when the internal combustion engine E is started, the internal combustion engine E can be started without trouble even if the dedicated starter motor is eliminated.

On the other hand, if the crankshaft 17 is rotated by the driving force reversely transmitted from the driving wheels when the vehicle is being braked, and the generator motors GM ... Are made to function as a generator, the generator motor G
It is possible to reduce the load on the service brake by generating a regenerative braking force on M ... By charging the power storage means with the electric power generated by the regenerative braking, the kinetic energy of the vehicle can be effectively recovered as electric energy, and the fuel consumption of the internal combustion engine E can be reduced.

By the way, among the five journals 18a to 18e of the in-line four-cylinder internal combustion engine E, the largest explosion load acts on the # 3 journal 18c located in the axial center, but this # 3 journal 18c is used. Since the generator motors GM ... Are arranged adjacent to the # 2 journal 18b and the # 4 journal 18d, the crankshaft 17 is avoided.
Can be dispersed in the axial direction, and the required strength of the crankshaft 17 can be reduced to contribute to weight reduction.

The rotor R of each generator motor GM is a disc 2
Since the permanent magnets 22 are fixed to the outer periphery of 1 over 360 °, the permanent magnets 22 always face the coils 25 while the crankshaft 17 is rotating. Thereby, when the generator motor GM functions as an electric motor, the output torque can be generated without interruption, and the torque fluctuation of the generator motor GM can be minimized. Further, when the generator motor GM functions as a generator, the generated power can be generated without interruption.

In the generator motor GM, the coils 25 generate heat during operation and the temperature of the core 24 rises, which may impair the functions of the motor and the generator.
Since a predetermined number of steel plates 24a to 24c of the plurality of steel plates forming the core 24 are bent to form the heat radiation fins 24d, the heat of the core 24 whose temperature has risen is released to the air to effectively cool the stator S. be able to.

The radiation fin 24d is a steel plate 24a of the core 24.
Since it is formed by using 24 to 24c, the number of parts and the assembling man-hours are reduced by eliminating the need for special parts, and moreover, a plurality of (three in the example) steel plates 24a to 24c are stacked, so that the rigidity thereof is increased. Can be secured. Further, since the radiation fins 24d are located in the vicinity of the oil surface of the oil stored in the oil pan 16, the function of a baffle plate for preventing the oil surface from shaking can be effectively achieved.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the components corresponding to those of the first embodiment are designated by the same reference numerals as those in the first embodiment.

The radiating fin 24d of the first embodiment is formed in a semi-circular shape along the outer periphery of the lower edges of the bearing caps 14b and 14d, but the radiating fin 24d of the second embodiment is formed.
Has a vertically extending portion and a horizontally extending portion and is formed in an L-shaped cross section. The radiation fin 24d is the core 24
Of the multiple steel plates that make up the three steel plates 24a to 2
It is the same as the first embodiment in that it is constructed by bending 4c.

Also according to this second embodiment, the above-mentioned first
The same effect as that of the embodiment can be obtained. Further, according to the second embodiment, since the horizontally extending portion of the heat radiation fin 24d is bent in a straight line with respect to the vertically extending portion, not only is the processing easier than in the case of being bent in an arc shape, but also , The horizontally extending part is the oil pan 16
Since it is parallel to the oil surface of the oil inside, the function as a baffle plate can be enhanced.

Although the embodiments of the present invention have been described in detail above, the present invention can be modified in various ways without departing from the scope of the invention.

For example, the internal combustion engine E of the present invention can be applied to any application other than the power source for running the hybrid vehicle.

Further, the generator motor GM may be made to exert only the function of the electric motor, or may be made to exert only the function of the generator.

In the invention described in claim 1, the radiating fins 24d may not have the function of a baffle plate.

In the embodiment, three steel plates 24a to 24c out of a large number of steel plates forming the core 24 of the stator S are used.
Although the heat radiation fins 24d are formed by extending the above, the number of steel plates is not limited to three. Further, the heat radiation fin 24d may be configured as a separate member and fixed to the core 24.

In the embodiment, the permanent magnets 22 are fixed to the outer circumference of the disc 21 of the crankshaft 17 to form the rotor R, but the permanent magnets 22 are fixed to the outer circumference of the balance weight 20 to fix the rotor R. Can also be configured. That is, the rotor R can be configured by using any web of the crankshaft 17.

[0041]

As described above, according to the invention described in claim 1, since the radiator fins are provided on the core of the stator which constitutes the generator or the electric motor in cooperation with the rotor provided on the crankshaft, When the generator or the electric motor operates and the coil heats up, the heat of the coil is released from the radiating fins provided in the core, so that the stator can be effectively cooled and the generator or the electric motor can be surely functioned. it can.

According to the invention described in claim 2,
Since the radiating fins form the baffle plate of the oil pan, the radiating fins can also be used as the baffle plates to prevent shaking of the oil stored in the oil pan without providing a special baffle plate.

According to the invention described in claim 3,
Since a part of the steel plate of the core of the stator is extended to form the heat dissipation fin, a special member for forming the heat dissipation fin is not required, and the number of parts and the number of assembling steps can be reduced.

According to the invention described in claim 4,
Since the heat radiation fin is formed by stacking a plurality of steel plates, the rigidity of the heat radiation fin can be sufficiently increased.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an internal combustion engine according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a diagram corresponding to FIG. 2 according to a second embodiment.

[Explanation of symbols]

11 cylinder block 14b, 14d Bearing cap 16 oil pan 17 crankshaft 21 Web (disk) 22 Permanent magnet 24 core 24a-24c Steel plate 24d heat dissipation fin 25 coils GM generator motor (generator or motor) R rotor S stator

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02F 7/00 301 F02F 7/00 301F 5H621 302 302A F02N 11/00 F02N 11/00 U 11/04 11 / 04 D H02K 1/14 H02K 1/14 Z 1/20 1/20 A 7/18 7/18 B 9/22 9/22 Z F term (reference) 3G015 AA07 BA09 BB06 CA07 3G024 AA55 AA65 DA18 5H002 AA10 AD03 AD08 5H607 AA02 BB01 BB02 BB07 BB14 CC05 FF02 FF24 5H609 BB03 BB04 BB13 PP08 QQ02 QQ23 RR63 5H621 BB07 GA01 GA04 HH01 JK07 JK11 JK15

Claims (4)

[Claims] 1. A bearing cap for rotatably supporting a crankshaft (17) in cooperation with a cylinder block (11), a stator (S) having a coil (25) wound around a core (24) made of laminated steel plates. (14b, 14
fixed to the crankshaft (17) web (2)
1) A generator (G) in which a rotor (R) having a plurality of permanent magnets (22) fixed to the outer circumference is opposed to the inner circumference of the stator (S).
M) or electric motor (GM) to the cylinder block (1
1) In an internal combustion engine arranged in an upper space of an oil pan (16) provided below, a radiator fin (24d) is attached to a core (24) of a stator (S).
An internal combustion engine characterized by being provided with. 2. The internal combustion engine according to claim 1, wherein the radiation fins (24d) provided on the core (24) of the stator (S) constitute a baffle plate of the oil pan (16). 3. A radiating fin (24d) is formed by extending a part of a steel plate (24a to 24c) forming a core (24) of a stator (S). The internal combustion engine according to 2. 4. The internal combustion engine according to claim 1, wherein a plurality of steel plates (24a to 24c) are superposed on each other to form a heat radiation fin (24d).