JP3070452B2 - Motor generator for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor generator for an internal combustion engine having both a function of starting an internal combustion engine as a motor and a function of performing a charging operation as a generator after the engine is started. .

[0002]

2. Description of the Related Art Conventionally, as this kind of technique, for example, there is a technique described in Japanese Patent Application Laid-Open No. 64-77752. The publication describes an engine having a start-up charging device having both functions of a starter motor (electric motor) and an alternator (generator) used for starting the engine.

[0003] As shown in FIG. 3, this start-up charging device includes a flywheel 9 attached to a crankshaft 91 of an engine.
2, a rotating field pole 93 provided on the wheel 92,
A field coil 94 and a stator coil 95 are provided on the inner and outer peripheries of the flywheel 92, respectively.

The flywheel 92 constitutes the rotor of the starting and charging device, is fixed to the end face of the crankshaft 91 by a plurality of bolts 96, and is rotatable integrally with the coaxial 91. A plurality of the rotating field poles 93 are formed on the outer periphery of the flywheel 92 at regular intervals in the circumferential direction.

The field coil 94 is attached to an aluminum plate 97 provided on an end face of the engine, and is closely opposed to a flywheel 92. Further, the stator coil 95 is a ring-shaped frame 100 sandwiched between an engine body 98 and a clutch housing 99.
It is stuck to. The core 95a of the stator coil 95 is closely opposed to the outer peripheral surface of the rotating field pole 93, and a minute gap is formed between the core 95a and the same surface.

On both sides of the outer periphery of the stator coil 95, cooling water pipes 101 are arranged in a state of contact with the coil 95, respectively. In the engine with the start-up charging device configured as described above, the field coil 94
By controlling the energization of the stator coil 95 to form a rotating magnetic field, the flywheel 92 can be rotated by applying an electromagnetic force to the rotating field pole 93. Then, the crankshaft 91 is rotated by the rotational force of the flywheel 92, and the engine can be started.
On the other hand, during operation of the engine, only the field coil 94 is energized to generate an induced electromotive force in the stator coil 95, and the battery can be charged by the generated electromotive force.

In the prior art, the heat of the stator coil 95 is absorbed by the cooling water flowing through the cooling water pipe 101. Therefore, a rise in the temperature of the stator coil 95 is suppressed, and a decrease in the operating performance of the starting charging device is prevented.

[0008]

However, the above prior art has the following problems. That is, since the cooling water pipe 101 for cooling the stator coil 95 is provided as a separate member with respect to the coil 95, there is a problem that the number of components of the starting and charging device increases. In addition, in order to efficiently cool the stator coil 95, it is necessary to increase the contact area between the coil 95 and the cooling water pipe 101. In this case,
The size of the cooling water pipe 101 is increased, and the size of the starting charging device is increased.

The present invention has been made in view of the above problems, and suppresses a temperature rise in a stator coil of a motor generator without increasing the size of the motor generator or increasing the number of parts. That is the purpose.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is provided between an internal combustion engine and a transmission to which a rotational driving force on an output shaft of the engine is input. A housing fixed to at least one of the internal combustion engine and the transmission, and a rotor core disposed in the housing, drivingly connected to the output shaft, and having a rotor coil wound therewith; A stator core disposed in the housing and fixed to the housing with a gap through which magnetic flux can pass between the housing and the outer peripheral portion of the rotor core; and a stator coil wound around the core. In a motor generator of an internal combustion engine provided with: a partition member extending from an inner peripheral wall surface of the housing is brought into contact with an outer peripheral wall surface of the stator coil; And the cooling medium supplied by the partition member
A cooling medium passage from which a cooling medium is supplied from a source ;
Are separated by the support inside the support
Through which the two internal spaces of the cooling medium passage are communicated.
The main point is that the road was formed .

The motor generator according to the present invention having the above configuration has the following operations. That is, when the internal combustion engine is started, a rotating force is applied to the rotor core by the rotating magnetic field generated in the stator coil. Since the rotor core is drivingly connected to the output shaft of the internal combustion engine, the output shaft is rotationally driven by the rotational force to start the internal combustion engine.

On the other hand, after the start of the internal combustion engine, the motor generator generates an induced electromotive force with the rotation of the rotor core, and the battery and the like provided in the internal combustion engine are charged by the induced electromotive force.

As described above, the present motor generator functions as an electric motor when the internal combustion engine is started, and functions as a generator after the internal combustion engine is started. At this time, the stator coil generates heat as current passes through the coil, and heat of the internal combustion engine or the transmission is transmitted to the coil. However, in the present motor generator, since the heat of the stator coil is absorbed by the cooling medium passing through the cooling medium passage, the temperature rise in the coil is suppressed. The cooling medium passage is formed by a space defined by a stator coil, a housing, and a partition member. Therefore, the motor generator is prevented from being enlarged by forming the cooling medium passage, and does not need to separately provide a housing or the like for forming the cooling medium passage.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a motor generator 10 according to the present embodiment includes an engine as an internal combustion engine (located on the left side in FIG. 1) and a transmission as a transmission (located on the right side in FIG. 1). ).

Crankshaft 1 constituting the output shaft of the engine
Numeral 2 is rotatably supported by a cylinder block (not shown) of the engine, and its base end (right side in the figure) extends to the side of the cylinder block, that is, the transmission side. A drive plate 27 is provided on the base end surface of the crankshaft 12 so as to be integrally rotatable.

On the other hand, the transmission input shaft 14
Is disposed on the same axis as the crankshaft 12, and a portion on the tip side (left side in the figure) extends from the housing 15 of the transmission toward the engine. The drive plate 1 is provided at the tip of the input shaft 14.
6 are provided. The drive plate 16 has a substantially disk shape as a whole, and a boss 16a is formed at the center thereof. As shown in FIG. 1, the boss portion 16a is externally fitted to the distal end portion of the input shaft 14 and spline-coupled coaxially.
4 can be integrally rotated. The rotational driving force of the engine crankshaft 12 is transmitted from the drive plate 27 to the input shaft 14 of the transmission via the cover 29, a pair of retainer plates 33 and 34, the coil spring 39, and the drive plate 16, which will be described later. It has become so.

A pump housing 17 is mounted on a housing 15 of the transmission. A distal end portion of the pump housing 17 is formed in a cylindrical shape having an insertion hole 18 therein as shown in FIG. On the other hand, the base end portion of the pump housing 17 is fixed to the transmission housing 15 by a plurality of bolts 19. A housing hole 20 communicating with the insertion hole 18 and opening toward the housing 15 is formed in a base end portion of the pump housing 17. When the pump housing 17 is fixed to the housing 15 of the transmission, the housing 15
The space surrounded by the wall surface of the housing hole 20 forms a housing space 21 for an oil pump 24 described later. The input shaft 14 is inserted and disposed inside the insertion hole 18 and the housing space 21, and the distal and proximal portions of the coaxial 14 are respectively provided by bearings 22 and 23 disposed in the insertion hole 18. It is rotatably supported.

A drive gear 25 and a driven gear 26, which constitute an oil pump 24, are provided in the housing space 21. The oil pump 24 is an internal gear type oil pump, and constitutes an oil supply source of the present invention. The input shaft 14 is inserted into the drive gear 25 and spline-coupled, so that the drive gear 25 and the input shaft 14 can rotate integrally. And
Drive and driven gear 2 accompanying rotation of input shaft 14
The rotation of the oil pumps 5 and 26 drives the oil pump 24 so that the lubricating oil in an oil pan (not shown) is supplied by pressure to a hydraulic control circuit (not shown) in the transmission.

The drive plate 27 includes a cover 29, a connecting member 30, and the like fixed to the plate 27 via a fixing portion 28. The cover 29
, A pair of retainer plates 33 and 34 are fixed by a plurality of rivets 37. As shown in FIG. 1, the outer peripheral portion of the drive plate 16 is disposed so as to be sandwiched between the two retainer plates 33 and 34. Further, the drive plate 16 and the two retainer plates 3
3 and 34 are drivingly connected by a coil spring 39.

The housing 11 of the motor generator 10 is
It is composed of a fixed part 31 and a second fixed part 32, a support part 35, and the pump housing 17 described above. First
The fixed part 31 is fixed to a cylinder block of the engine so as to cover one side of the drive plate 27, and rotatably supports the crankshaft 12 via a bearing 36. Further, the second fixing portion 32 is positioned with a knock pin (not shown) with respect to the housing 15 of the transmission, and a plurality of bolts 38 are provided.
It is fixed by. A support portion 35 having a substantially annular shape is disposed between the fixing portions 31 and 32, and is fixed to the fixing portions 31 and 32 by a knock pin (not shown).

The motor generator 46 is connected to the connecting member 30 via a rotor support 44, and is arranged so as to cover the rotor 40 rotating integrally with the drive plate 27 and the outer peripheral portion of the rotor 40. Stator 41 provided. The connecting member 30 has a deep dish shape as a whole,
A mounting hole 47 is formed at the center thereof. A cylindrical rotor support portion 44 is inserted into the mounting hole 47, and a locking portion 44 a formed at an end of the support portion 44 is welded to a side portion of the connecting member 30.

The rotor 40 includes an annular rotor core 42 and a rotor coil 43 wound around the core 42. The rotor core 42 has a rotor coil 43
And is formed of a high magnetic permeability material (for example, a silicon steel plate). The rotor 40 is integrally rotatable with the crankshaft 12 when the rotor core 42 is shrink-fitted and fixed at an outer peripheral portion of the rotor support portion 44.

Further, inside the rotor support portion 44,
The front end portion of the pump housing 17 is arranged to be extended. A cylindrical pipe member 45 is press-fitted and externally fitted to the extended portion. The pipe member 45 is formed of an iron material whose wear resistance has been improved by heat treatment. Two roller bearings 46a and 46b are arranged between the outer peripheral portion of the pipe member 45 and the inner peripheral portion of the rotor support 44.
The rotor support 44 is rotatably supported by the pump housing 17 by the two roller bearings 46a and 46b.

On the other hand, the stator 41 has a stator core 50 formed in an annular shape, and a stator coil 5 wound around the core 50 and having an outer peripheral portion covered with a resin layer 52.
And 1. The stator core 50 is made of a material having a high magnetic permeability similarly to the rotor core 42.
The outer peripheral portion of the stator core 50 is
It is fixed by shrink fitting. Also, the stator coil 51
Is connected to a capacitor (not shown) via an inverter (not shown), while a battery (not shown)
Is also connected. As described above, when the stator 41 is fixed to the housing 11, the stator core 50
An annular gap G is formed between the inner peripheral wall of the rotor core 42 and the outer peripheral wall of the rotor core 42, and the rotor core 42 is
And the magnetic flux generated in the stator core 50 can pass through.

In this embodiment, in addition to the above configuration, as shown in FIG. 2, the space between the second fixing portion 32 and the support portion 35, the stator core 50, and the stator coil 51 constituting the housing 11 is increased. A cooling oil passage 53 is formed as a cooling medium passage. This cooling oil passage 53
Is composed of a first internal space 57, a second internal space 62, and a connection oil passage 65 communicating the two spaces 57 and 62, and a lubricating oil as a cooling medium can flow through the oil passage 53. It has become. Hereinafter, the configuration of the cooling oil passage 53 will be described in more detail.

As shown in FIG. 2, the outer peripheral wall surface of the stator coil 51 is covered by the second fixing portion 32, and a part of the wall surface has a cylindrical shape extending from the pump housing 17. The tip of the seal portion 54 is in contact with the resin layer 52. This seal part 5
Reference numeral 4 denotes a partition member of the present invention. An annular groove 56 extending in the circumferential direction is formed at a tip portion of the partition member 4, and an O-ring 55 is disposed in the annular groove 56. The O-ring 55 seals the gap between the seal portion 54 and the resin layer 52 of the stator coil 51, so that the second fixing portion 32, the support portion 35, the stator coil 5
A first internal space 57 surrounded by the first resin layer 52, the seal portion 54, and the like is formed.

On the other hand, as shown in FIG. 1, an annular convex portion 58 extending in the circumferential direction is formed as a partition member on the inner peripheral portion of the support portion 35. An O-ring 59 is provided at the tip of the annular convex portion 58, and the O-ring 59 is in contact with the resin layer 52 of the stator coil 51. Also,
The O-ring 59 is located at a position adjacent to the annular convex portion 58.
An annular member 60 for supporting from the side is disposed to be fitted inside the inner peripheral portion of the support portion 35. And the annular member 6
Numeral 0 is fixed by a snap ring 61 attached to the inner peripheral wall of the support portion 35. By the O-ring 59,
By sealing between the annular convex portion 58 and the resin layer 52, a second internal space 62 surrounded by the annular member 60, the support portion 35, and the resin layer 52 of the stator coil 51 is formed.

The input shaft 1 is provided inside the support portion 35.
4, a connection oil passage 65 extending in the axial direction is formed. The connection oil passage 65 connects the first internal space 57 and the second internal space 62 to each other. Further, an oil supply path 64 (only a part thereof is shown in FIG. 2) communicating with the second internal space 62 is formed inside the support portion 35. The oil supply path 64 communicates with an oil cooler (not shown) through an oil path (not shown). After the oil in the oil cooler is introduced into the oil supply path 64 through the oil path, 2
It is supplied to the internal space 62. On the other hand, the second fixing portion 32
Is formed with an oil discharge passage 66 (a part of which is shown in FIG. 1) communicating the first internal space 57 with an oil pan (not shown).

Next, the operation of the motor generator 10 according to the present embodiment configured as described above will be described. First, when starting the operation of the engine, the stator coil 51
Is controlled to be energized, and a rotating magnetic field having a phase advanced with respect to the rotation of the rotor coil 43 is generated in the coil 51. Then, a rotating force is applied to the rotor core 42 by the rotating magnetic field, and the drive plate 27 and the crankshaft 12 connected to the rotor 40 are rotated by the rotating force to start the engine. The rotational force generated in the rotor 40 is used not only at the time of starting the engine, but also as an auxiliary power when the engine is operated at a high output.

Next, when the engine is started, the rotational driving force of the crankshaft 12 is applied to the drive plate 27,
The power is transmitted to the input shaft 14 of the transmission via the cover 29, the retainer plates 33 and 34, the coil spring 39, and the drive plate 16. At this time, the conduction of the stator coil 51 is controlled, and the coil 51 generates a rotating magnetic field having a phase delayed with respect to the rotation of the rotor coil 43 and generates an induced electromotive force accompanying the rotation of the rotor 40. Then, the induced electromotive force charges a capacitor (neither is shown) via an inverter. Further, when the stator 40 is energized in this way and the rotor 40 is rotated in a state where an induced electromotive force is generated in the coil 51, the rotation of the input shaft 1
4 consumes more rotational energy, and can assist in braking the vehicle.

As described above, according to the motor generator 10 of the present embodiment, the motor generator 10 functions as a motor and a generator, thereby starting the engine, assisting at the time of high output, and controlling the vehicle. Braking assistance can be provided.

In the present embodiment, the engine is started, and the input shaft 1 is rotated with the rotation of the crankshaft 12.
When the rotary gear 4 is driven to rotate, the drive gear 25 spline-coupled to the coaxial 14 rotates to drive the oil pump 24. Then, as the oil pump 24 is driven,
From the discharge port 63 of the pump 24, lubricating oil is supplied under pressure to a hydraulic control circuit (not shown) in the transmission, and an oil cooler (not shown) and the second internal space via the oil supply path 64. 62. Further, the lubricating oil supplied to the second internal space 62 is supplied to the first internal space 57 via the connection oil passage 65, and then discharged from the oil discharge passage 66 to an oil pan (not shown).

As described above, in the present embodiment, the oil of the oil pump 24 is supplied to the oil pressure control circuit, the oil cooler (both not shown), the oil supply path 64, the second internal space 62, the connection oil path 65, First internal space 57, oil discharge passage 6
6, and is returned to the oil pan. Here, when the oil passes through the first internal space 57 and the second internal space 62, the stator coil 51 is cooled by the oil,
The temperature rise is suppressed. That is, since the lubricating oil in the internal spaces 57 and 62 is in contact with the resin layer 52 of the stator coil 51, the heat of the coil 51 is
2 to the lubricating oil.

Further, the lubricating oil contacts the outer peripheral portion of the support portion 35 fixing the stator core 50,
Similarly, on the inner peripheral wall surface of the connection oil passage 65,
5 is touched. Therefore, the heat transmitted from the stator coil 51 to the support portion 35 is transmitted from the support portion 35 to the lubricating oil.

As a result, the heat of the stator coil 51 is absorbed by the lubricating oil, and the temperature rise of the coil 51 is suppressed. The heat of the stator coil 51 absorbed by the lubricating oil is released to the outside when the lubricating oil passes through the oil cooler. As described above, the heat of the stator coil 51 is absorbed by the lubricating oil and the coil 51 is cooled, thereby preventing the performance of the motor generator 10 from being deteriorated.

The configuration and operation of the present embodiment have been described above. The present embodiment has the following effects (a) to (d). (A) In the present embodiment, the cooling oil passage 53 for cooling the stator coil 51 includes the support portion 35 and the second fixing portion 32 that constitute the housing 11 of the motor generator 10.
And the stator coil 51. Therefore, the motor generator 10 in the present embodiment
In this case, it is not necessary to separately provide a member for forming the cooling oil passage 53, and it is possible to prevent an increase in the number of components due to the provision of the cooling oil passage 53.

(B) The cooling oil passage 53 is connected to the motor generator 10
The oil passage 53 is provided in the motor generator 10 without increasing the size of the housing 11 because the oil passage 53 is formed in the space between the support portion 35 and the second fixing portion 32 constituting the housing 11 and the stator coil 51. In addition, the contact area between the stator coil 51 and the lubricating oil can be set larger, and the coil 51 can be cooled effectively.

(C) In the present embodiment, an existing oil pump 24 that supplies lubricating oil to the transmission side as a cooling medium supply source is used, and an oil pump is used as a cooling medium for cooling the stator coil 51. The lubricating oil supplied from 24 was used. Therefore, a configuration for cooling the stator coil 51 can be more easily constructed.

(D) In the present embodiment, the resin layer 52 is formed so as to cover the outer peripheral portion of the stator coil 51. Therefore, it is possible to prevent the lubricating oil in the first internal space 57 and the second internal space 62 from permeating into the stator coil 51.

It is to be noted that the present embodiment can be implemented by changing its configuration as follows. (1) The cooling oil passage 53 in the present embodiment is used as a cooling water passage, and this passage communicates with a water jacket (not shown) formed in a cylinder block of the engine.
Then, cooling water pressurized and supplied to the water jacket from a water pump (not shown) provided in the engine is introduced into the cooling water passage to cool the stator coil 51. Even with the above configuration, the same operation and effect as those of the above embodiment can be obtained.

While the embodiments embodying the present invention have been described above, the technical ideas grasped from the above embodiments will be described together with their effects. (A) The motor generator for an internal combustion engine according to claim 1,
The cooling medium passage is connected to an oil pump for supplying lubricating oil to the transmission, and the pump supplies lubricating oil to the cooling medium passage as a cooling medium.

According to the above configuration, a configuration for cooling the stator coil can be more easily constructed.

[0044]

As described above, according to the present invention,
The temperature rise in the stator coil of the motor generator can be suppressed without increasing the size of the motor generator or increasing the number of parts.

[Brief description of the drawings]

FIG. 1 is a sectional view of a motor generator according to an embodiment.

FIG. 2 is an enlarged sectional view of a main part of the motor generator according to the embodiment.

FIG. 3 is a cross-sectional view showing a start-up charging device according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Motor generator, 11 ... Housing, 24 ... Oil pump (oil supply source), 53 ... Cooling oil passage (Cooling medium passage), 54 ... Seal part (partition member), 58 ... Annular convex part (Partition member) ).

Continuation of front page (56) References JP-A-63-198556 (JP, A) JP-A-7-194060 (JP, A) JP-A-62-244245 (JP, A) JP-A-61-154461 (JP) , A) (58) Field surveyed (Int.Cl. ⁷ , DB name) F02N 11/04

Claims (1)

(57) [Claims] 1. A housing provided between an internal combustion engine and a transmission to which a rotational driving force on an output shaft of the engine is input, wherein the housing is fixed to at least one of the internal combustion engine and the transmission. A rotor core disposed in the housing, drivingly connected to the output shaft, and wound with a rotor coil; and a rotor core similarly disposed in the housing, and A motor generator for an internal combustion engine, comprising: a stator core fixedly provided with a gap through which magnetic flux can pass between the outer peripheral portion; and a stator coil wound around the core. The partition member extending from the wall surface is brought into contact with the outer peripheral wall surface of the stator coil, and the stator coil, the housing, and the partition member determine whether a cooling medium supply source is provided.
And forming a cooling medium passage through which the cooling medium is supplied from the stator core.
Separated by the support inside the fixed support
A passage connecting the two internal spaces of the cooling medium passage;
Motor generator for an internal combustion engine, characterized in that the formed.