JP2023054605A - Motor generator cooling device and hybrid engine - Google Patents

Abstract

To provide a motor generator cooling device and a hybrid engine including the motor generator cooling device which can efficiently cool a motor generator while suppressing intrusion of foreign matters into the motor generator.SOLUTION: A motor generator cooling device 10 is disposed between an air cleaner 14 clarifying intake air AR supplied to an engine body 1A and the engine body 1A and includes a casing 12 which covers and accommodates a motor generator 11. The intake air AR flowing into the casing 12 through the air cleaner 14 cools the motor generator 11.SELECTED DRAWING: Figure 5

Description

The present invention relates to a motor-generator cooling device for cooling a motor-generator and a hybrid engine including the motor-generator cooling device.

Patent Document 1 discloses a motor-generator cooling device that cools a motor-generator using an air pump. Here, the air pump supplies air to the motor generator through the conduit. This air cools the motor generator. The motor-generator cooling device disclosed in Patent Document 1 is provided with an air pump corresponding to the amount of heat generated by the motor-generator, so it has the advantage of reliably cooling the motor-generator, but has the disadvantage of complicating the configuration of the device.

Patent Literature 2 discloses a motor-generator cooling device that cools a motor-generator arranged between a clutch and a transmission mechanism using a cooling air passage. Here, the cooling air passage is formed so as to extend from the casing of the clutch through the inside of the motor generator to reach the speed change mechanism. Therefore, the air flow generated by the rotation of the motor generator passes through the cooling air passage. This air cools the motor generator. The motor-generator cooling device disclosed in Patent Document 2 uses the air flow that accompanies the rotation of the motor-generator itself, so it has the advantage of being able to simplify the device configuration compared to the case of using the air pump of Patent Document 1. On the other hand, there is room for improvement in that the cooling capacity cannot be set according to the amount of heat generated by the motor generator.

In general, a motor generator has a rotor that has a permanent magnet and rotates, a stator that has a coil and is fixed so as to rotatably accommodate the rotor, and a motor case that covers the stator. . In order to prevent the inside of the motor generator from becoming hot, the motor case is provided with an opening that connects the inside of the motor generator to the outside. As a result, the heat inside the motor generator is released to the outside of the motor generator through the open portion of the motor case. Therefore, foreign matter such as dust contained in the outside air may enter the motor generator through the open portion of the motor case. In that case, the foreign matter may cause the motor generator to malfunction. In particular, in a hybrid engine installed in an industrial machine that is used in an environment that is harsher than that of an automobile, the motor generator may be damaged by foreign matter such as dust contained in the outside air. In the specification of the present application, the term "hybrid engine" means a prime mover that includes an "electric motor" and an "internal combustion engine." Here, an "electric motor" includes a "motor generator" that also functions as a generator.

Japanese Patent Application Laid-Open No. 2008-44406 JP 2014-83870 A

The present invention has been made in view of the above circumstances, and provides a motor-generator cooling device and a motor-generator cooling device capable of efficiently cooling a motor generator while preventing foreign matter from entering the interior of the motor generator. It is an object of the present invention to provide a hybrid engine equipped with

The above-described problem is a motor-generator cooling device that cools a motor-generator, and includes a casing that is disposed between an air cleaner that cleans intake air supplied to an engine and the engine to cover and accommodate the motor-generator. The problem is solved by a motor-generator cooling device, wherein the intake air flowing into the casing through the air cleaner cools the motor-generator.

According to the motor-generator cooling device of the present invention, clean intake air from which foreign matter such as dust has been removed by passing through the air cleaner passes through the inside of the casing that covers and accommodates the motor-generator. Therefore, the motor generator can be cooled by the intake air while preventing foreign matter from entering the motor generator. In addition, the motor generator is cooled by the intake air that flows into the casing while being covered and housed in the casing. Therefore, in the motor-generator cooling device according to the present invention, when the motor-generator is not housed in the casing, for example, the motor-generator is arranged at a position where the cooling air sent from the cooling fan of the engine hits, and the cooling air is cooled. The low-temperature intake air can be brought into contact with a wide range of the high-temperature outer surface of the motor generator at a high flow rate, so that the motor generator can be efficiently cooled.

In the motor-generator cooling device according to the present invention, preferably, the casing is fixed to the engine.
According to the motor-generator cooling device of the present invention, the casing is fixed to the engine. As a result, it is possible to suppress the casing from vibrating with respect to the engine, thereby suppressing the generation of noise.

In the motor-generator cooling device according to the present invention, preferably, the casing has fins for heat radiation provided on an outer surface thereof.
According to the motor-generator cooling device of the present invention, even if the motor-generator inside the casing generates heat, the motor-generator is cooled by the intake air flowing into the casing. Furthermore, the heat of the motor generator is radiated to the outside of the casing via the intake air through the heat radiation fins provided on the outer surface of the casing. Therefore, the motor-generator cooling device according to the present invention can further prevent the motor-generator from becoming hot, and can further prevent the motor-generator from being restricted in output due to temperature rise.

The motor-generator cooling device according to the present invention preferably includes a first pipe provided between the air cleaner and the casing for guiding the intake air passing through the air cleaner into the casing, the casing and the engine. and a second pipe that is provided between and guides the intake air that has cooled the motor generator inside the casing to an intake system of the engine.
According to the motor-generator cooling device of the present invention, intake air that has passed through the air cleaner flows into the casing through the first pipe provided between the air cleaner and the casing. The intake air that has cooled the motor generator inside the casing is supplied to the intake system of the engine through a second pipe provided between the casing and the engine. Therefore, the intake air from which foreign substances have been removed by the air cleaner cools the motor-generator inside the casing, and is then supplied to the intake system of the engine and effectively utilized, rather than being discharged to the outside of the engine. Further, since the intake negative pressure of the engine can be used, the flow velocity of the intake air for cooling the motor generator inside the casing can be increased. Thereby, the motor generator can be efficiently cooled.

The motor-generator cooling device according to the present invention preferably further includes a filter provided inside the second pipe for removing foreign matter contained in the intake air that has cooled the motor-generator.
According to the motor generator cooling device of the present invention, the filter is provided inside the second pipe. The filter removes foreign matter contained in the intake air that has cooled the motor generator. Therefore, even if foreign matter generated from the motor generator mixes in the intake air that has cooled the motor generator, the filter can remove the foreign matter mixed in the intake air that has cooled the motor generator from the intake air. Therefore, the motor-generator cooling device according to the present invention can supply the intake air from which the foreign matter has been removed to the intake system of the engine, thereby suppressing the contamination of the intake system of the engine with foreign matter.

In the motor-generator cooling device according to the present invention, preferably, the second pipe has a heat radiating portion that releases heat inside the second pipe to the outside of the second pipe.
According to the motor-generator cooling device of the present invention, the heat radiating section is provided on the second pipe. The radiator can release the heat of the intake air whose temperature has increased by cooling the motor generator, that is, the heat inside the second pipe to the outside of the second pipe. Therefore, the motor-generator cooling device according to the present invention can supply intake air having a temperature lower than the temperature immediately after passing through the motor-generator to the intake system of the engine.

Preferably, the motor-generator cooling device according to the present invention is connected to the first pipe and the second pipe, and directs part of the intake air flowing through the first pipe to the first pipe without passing through the casing. It is characterized by further comprising a third pipe leading to the second pipe.
According to the motor-generator cooling device according to the present invention, since the casing houses the motor-generator, the pressure loss generated when the intake air passes through the third pipe is the pressure generated when the intake air passes through the casing. Less than loss. Therefore, when the third pipe is provided, the negative pressure of the intake air supplied to the intake system of the engine is smaller than when the third pipe is not provided. Therefore, the third pipe can reduce the intake negative pressure of the engine, thereby improving the fuel efficiency of the engine.

In the motor-generator cooling device according to the present invention, the casing preferably has a first hole through which the output shaft of the motor-generator passes and protrudes outside the casing. The motor-generator cooling device according to the present invention is characterized by further comprising a first sealing member provided in the first hole and maintaining airtightness between the casing and the output shaft.
According to the motor-generator cooling device of the present invention, the first seal member is provided in the first hole of the casing. The first hole allows the output shaft of the motor generator to pass therethrough and protrudes outside the casing. Also, the first sealing member maintains airtightness between the casing and the output shaft of the motor generator. As a result, the motor-generator cooling device according to the present invention can prevent foreign matter outside the casing from entering the casing through the gap between the casing and the output shaft of the motor-generator.

In the motor-generator cooling device according to the present invention, preferably, the casing has a second hole through which a wire harness of the motor-generator is passed and led to the outside of the casing. The motor-generator cooling device according to the present invention is characterized by further comprising a second seal member provided in the second hole and maintaining airtightness between the casing and the wire harness.
According to the motor-generator cooling device of the present invention, the second seal member is provided in the second hole of the casing. The second hole allows the wire harness of the motor generator to pass through and leads to the outside of the casing. Also, the second sealing member maintains airtightness between the casing and the wire harness of the motor generator. As a result, the motor-generator cooling device according to the present invention can prevent foreign matter outside the casing from entering the interior of the casing through the gap between the casing and the wire harness of the motor-generator.

In the motor-generator cooling device according to the present invention, preferably, the air cleaner is a second air cleaner provided in an intake path different from the intake path of the first air cleaner provided in the engine, and the second air cleaner is The intake air that has passed through the first air cleaner joins the intake air that has passed through the first air cleaner after cooling the motor generator, and is supplied to the engine.
According to the motor-generator cooling device of the present invention, the intake path of the second air cleaner, in which the pressure loss due to the cooling of the motor generator inside the casing is increased, is different from the intake path of the first air cleaner provided in the engine. It is provided as a dedicated intake path for separate intake air. The intake air that has passed through the intake path of the second air cleaner cools the motor generator, and then joins the intake air that has passed through the intake path of the first air cleaner. The combined intake air is supplied to the intake system of the engine. Since the intake path of the first air cleaner has a pressure loss smaller than that of the intake path of the second air cleaner, the negative pressure of the intake air supplied to the intake system of the engine exists only through the intake path of the second air cleaner. small compared to when Therefore, the intake negative pressure of the engine can be reduced compared to the case where only the intake path of the second air cleaner exists, and accordingly the fuel consumption of the engine can be improved.

Further, the problem is a hybrid engine including a motor-generator cooling device that cools a motor-generator, wherein the motor-generator cooling device is located between an air cleaner that cleans intake air supplied to the engine and the engine. and a casing that covers and houses the motor-generator, wherein the intake air flowing into the casing through the air cleaner cools the motor-generator.

According to the hybrid engine equipped with the motor-generator cooling device according to the present invention, in the motor-generator cooling device, clean intake air from which foreign matter such as dust has been removed passes through the air cleaner and enters the casing that covers and accommodates the motor-generator. Pass inside. Therefore, the motor generator can be cooled by the intake air while preventing foreign matter from entering the motor generator. In addition, the motor generator is cooled by the intake air that flows into the casing while being covered and housed in the casing. Therefore, in the motor-generator cooling device, when the motor-generator is not housed in the casing, for example, the motor-generator is arranged at a position where the cooling air sent from the cooling fan of the engine hits and is cooled by this cooling air. Compared to the case, the low-temperature intake air can be brought into contact with a wide range of the high-temperature outer surface of the motor generator at a high flow rate, so that the motor generator can be efficiently cooled. As a result, it is possible to prevent the motor-generator from becoming hot, so that it is possible to prevent the motor-generator from being restricted in output due to temperature rise, and to prevent the deterioration of the ability of the motor-generator to drive the hybrid engine. can.

According to the present invention, it is possible to provide a motor-generator cooling device and a hybrid engine including the motor-generator cooling device that can efficiently cool the motor generator while preventing foreign matter from entering the motor generator. .

1 is a perspective view showing a hybrid engine provided with a motor-generator cooling device according to an embodiment of the invention; FIG. FIG. 2 is a side view showing a partially cutaway state of the motor-generator cooling device according to the present embodiment; FIG. 2 is a front view showing a partially cutaway state of the motor-generator cooling device according to the present embodiment; 1 is a plan view showing a motor-generator cooling device according to this embodiment; FIG. 1 is a block diagram that schematically shows a hybrid engine according to an embodiment; FIG. 1 is a perspective view schematically showing a hybrid engine according to this embodiment; FIG. FIG. 4 is a block diagram schematically showing a hybrid engine according to a second embodiment of the invention; FIG.

Preferred embodiments of the invention are described in detail below with reference to the drawings.
Since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are applied. Unless otherwise stated, the invention is not limited to these modes. Further, in each drawing, the same constituent elements are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

(First embodiment)
(Example structure of hybrid engine 1)
FIG. 1 is a perspective view showing a hybrid engine provided with a motor-generator cooling device according to a first embodiment of the invention.
FIG. 2 is a side view showing a partially cutaway state of the motor-generator cooling device according to the present embodiment.
FIG. 3 is a front view showing a partially cutaway state of the motor-generator cooling device according to the present embodiment.
FIG. 4 is a plan view showing the motor-generator cooling device according to this embodiment.

A hybrid engine 1 shown in FIGS. 1 to 4 is a hybrid engine mounted on an industrial machine, and includes an engine main body 1A, a motor generator 11, and a motor generator cooling device . Examples of industrial machines include construction machines such as forklifts and tractors, and agricultural machines. The engine main body 1A is, for example, a multi-cylinder diesel engine such as a turbocharged, supercharged, high-power three-cylinder engine or a four-cylinder engine. Note that the industrial machine is not limited to a vehicle, and may be a stationary machine such as a generator. The engine body 1A may be a naturally aspirated diesel engine, a supercharged gasoline engine with a turbocharger, a naturally aspirated gasoline engine, or the like.

The format of the hybrid engine 1 according to this embodiment is, for example, a parallel system. In the parallel type hybrid engine 1, the driving force of the motor generator 11 shown in FIG. That is, the motor generator 11 is operated by the voltage supplied from the hybrid battery, and assists the engine main body 1A when necessary. Therefore, the motor-generator 11 is larger and has a higher output than a normal alternator.

As shown in FIG. 1, the engine body 1A has a cylinder block 2, a cylinder head 3, a head cover 4, an oil pan 5, an exhaust gas aftertreatment device 6, a turbocharger 7, and a cooling fan 9. . The cylinder head 3 is assembled on the cylinder block 2 . A head cover 4 is assembled on the cylinder head 3 . The cylinder head 3 is equipped with an exhaust gas aftertreatment device 6 and a turbocharger 7 .

(Motor-generator cooling device 10)
Next, the motor-generator cooling device 10 according to this embodiment will be described.
As shown in FIGS. 1 and 2, the motor-generator cooling device 10 is fixed to the engine body 1A on the side of the front portion of the engine body 1A, that is, at a position near the cooling fan 9. As shown in FIG. Motor-generator cooling device 10 has a casing 12 , and cools motor-generator 11 in a state in which motor-generator 11 is enclosed in casing 12 and motor-generator 11 is accommodated inside casing 12 .

<Casing 12>
FIG. 5 is a block diagram schematically showing the hybrid engine according to this embodiment.
FIG. 6 is a perspective view schematically showing the hybrid engine according to this embodiment.
As shown in FIGS. 5 and 6 , the motor-generator cooling device 10 has a casing 12 . The casing 12 is made of metal having excellent thermal conductivity, such as iron or aluminum, and covers and houses the motor generator 11 . As a result, the casing 12 prevents foreign matter such as dust, oil, and moisture from adhering to the motor generator 11 , thereby reducing the failure rate of the motor generator 11 .

The casing 12 is arranged between the air cleaner 14 and the intake system of the engine body 1A. For example, the casing 12 is attached to a plurality of locations on the side surface of the front portion of the cylinder head 3 using bolts 15 . As a result, the casing 12 can be reliably fixed to the engine main body 1A, thereby suppressing the vibration of the casing 12 with respect to the engine main body 1A and preventing the casing 12 from generating noise when the hybrid engine 1 operates. can be suppressed.

As indicated by the arrows shown in FIGS. 5 and 6, outside air flows into the engine room 13 as intake air AR. The outer shape of the casing 12 is made substantially cylindrical in consideration of the air resistance of the intake air AR. A tip portion 12T of the casing 12 has a rounded streamlined portion 12S with rounded corners. As a result, the intake air AR flows smoothly around the casing 12 even when the casing 12 is mounted on the side surface of the front portion of the engine body 1A. Therefore, the casing 12 of the present embodiment can reduce the air resistance and the noise associated with the air resistance as compared with a rectangular casing such as a rectangular parallelepiped casing. Thus, the casing 12 is formed in a streamlined shape so as not to block the flow of the intake air AR inside the engine room 13 .

<First Pipe 20 and Second Pipe 21>
As shown in FIGS. 5, 6, and 1, the casing 12 includes a first pipe 20 that takes intake air AR into the casing 12 and a second pipe 21 that discharges the intake air AR from the inside of the casing 12 to the outside. and connected to The first pipe 20 and the second pipe 21 are, for example, cylindrical pipes made of metal such as iron, aluminum, or the like, which are excellent in heat dissipation. However, the material of the first pipe 20 and the second pipe 21 is not limited to metal, and may be made of resin such as rubber having elasticity and flexibility.

One end 20A of the first pipe 20 is connected to the air cleaner 14 . The other end 20B of the first pipe 20 is connected to the casing 12 and communicates with the internal space SP of the casing 12 . Thus, the first pipe 20 is provided between the air cleaner 14 and the casing 12, and can guide the intake air AR that has passed through the air cleaner 14 to the internal space SP of the casing 12 (see FIG. 3).

On the other hand, as shown in FIGS. 3 and 4, one end 21A of the second pipe 21 is connected to the internal space SP of the casing 12. As shown in FIG. The other end 21B of the second pipe 21 is connected to the inlet of the blow-by gas mixing joint 22 . Thus, the second pipe 21 is provided between the casing 12 and the engine body 1A, and can guide the intake air AR discharged from the internal space SP of the casing 12 to the intake system of the engine body 1A.

As shown in FIGS. 1 and 2, the intermediate portion 21C of the second pipe 21 is arranged so as to avoid contact with the engine body 1A. As shown in FIGS. 1 and 3, the intermediate portion 21C occupies a relatively long portion of the entire length of the second pipe 21, and extends along the Y direction across the front side of the engine body 1A. are placed. As a result, the second pipe 21 is forcibly cooled inside the engine room 13 by the cooling air sent from the cooling fan 9 .

As shown in FIGS. 5 and 6, the low-temperature intake air AR that has entered the air cleaner 14 inside the engine room 13 is cleaned by removing foreign matter such as dust, and then passes through the first pipe 20 to the motor generator. 11 flows into the internal space SP of the casing 12 as a cooling medium. After cooling the motor generator 11, the low-temperature intake air AR flowing into the casing 12 is discharged from the internal space SP of the casing 12 through the second pipe 21 to the blow-by gas mixing joint 22 as the intake system of the engine main body 1A. be done.

As shown in FIG. 5 , a filter 23 different from the air cleaner 14 may be provided inside the second pipe 21 . In this case, even if there is foreign matter such as dust in the intake air AR that has passed through the internal space SP of the casing 12, the filter 23 can remove the foreign matter contained in the intake air AR. Accordingly, even if foreign matter generated from the motor generator 11 is mixed in the intake air AR cooling the motor generator 11, the filter 23 can remove the foreign matter mixed in the intake air AR cooling the motor generator 11 from the intake air AR. Therefore, the motor-generator cooling device 10 according to the present embodiment can supply the intake air AR from which foreign matter has been removed to the intake system of the engine main body 1A, thereby preventing foreign matter from entering the intake system of the engine main body 1A. can be suppressed. Moreover, it is possible to suppress the occurrence of failure of the engine main body 1A.

As shown in FIG. 6, the blow-by gas mixing joint 22 mixes the intake air AR of the intake system and the gas component G of the flow-by gas to create new intake air AS and supplies it to the blower 25 of the turbocharger 7. . On the other hand, the exhaust that has passed through the exhaust passage of the engine body 1A is supplied to the turbine 26 of the turbocharger 7, causing the turbine 26 and the blower 25 to rotate at high speed. As a result, the intake air AS is compressed by the blower 25 and supercharged to the intake passage of the intake system of the engine body 1A. In this way, the intake air AR after passing through the casing 12 and cooling the motor generator 11 is mixed with the gas component G of the flow-by gas and used as intake air AS.

<Fin 30 for heat dissipation and heat dissipation part 33>
As shown in FIG. 4, the casing 12 has a plurality of fins 30 for heat radiation. A plurality of heat radiation fins 30 are provided on the outer surface of the casing 12 at intervals. The heat radiation fins 30 can release heat generated by driving the motor generator 11 from the internal space SP of the casing 12 to the outside of the casing 12 . At this time, since the fins 30 come into contact with the cold air sent from the cooling fan 9 , heat generated by driving the motor generator 11 can be efficiently released to the outside of the casing 12 . As a result, the fins 30 can prevent the motor generator 11 housed in the casing 12 from becoming hot during operation, and can prevent the motor generator 11 from being restricted in output due to temperature rise. Further, the heat radiation fins 30 are preferably formed along the flow direction X of the intake air AR passing through the interior of the engine room 13, thereby suppressing wind noise.

Further, as shown in FIG. 4 , the second pipe 21 has a heat radiating portion 33 . The heat radiation part 33 may be formed in a part of the second pipe 21 , for example, the intermediate part 21C of the second pipe 21 , or may be formed over the entire length of the second pipe 21 . The heat radiating portion 33 has, for example, a bellows shape in order to expand the heat radiating area, and radiates the heat inside the second pipe 21 to the outside of the second pipe 21 . That is, when the intake air AR that has cooled the motor generator 11 passes through the second pipe 21 , the heat radiator 33 releases the heat of the intake air AR warmed by cooling the motor generator 11 to the outside of the second pipe 21 . do. At this time, the heat radiating portion 33 is in contact with the cool air sent from the cooling fan 9, so that the heat of the intake air AR warmed by cooling the motor generator 11 can be efficiently released to the outside of the second pipe 21. can be done. Therefore, the motor-generator cooling device 10 according to the present embodiment can supply the intake air AR having a temperature lower than the temperature immediately after passing through the motor-generator 11 to the intake system of the engine body 1A. Therefore, the cooled intake air AR is supplied from the second pipe 21 to the turbocharger 7 via the blow-by gas mixing joint 22 . Therefore, the efficiency of the engine main body 1A can be improved.

As shown in FIG. 5, the operation of the engine body 1A is controlled by an engine ECU (Electronic Control Unit) 50. As shown in FIG. Motor generator 11 operates with the voltage supplied from hybrid battery 51 . The drive voltage of the hybrid battery 51 is boosted from 12 V to 48 V, for example, by the boost converter 52 and supplied to the motor generator 11 via the wire harness 39 . Operations of the hybrid battery 51 and the boost converter 52 are controlled by the hybrid ECU 53 . Examples of the hybrid battery 51 include a lithium-ion battery, a nickel-hydrogen battery, an all-solid battery, and the like.

As shown in FIG. 5, a pulley 11P is attached to the output shaft 11G of the motor generator 11. As shown in FIG. A pulley 1P is attached to the output shaft 1S of the engine body 1A. A transmission belt 34 is hung on the pulleys 1P and 11P. As a result, the driving force of the motor generator 11 is transmitted to the output shaft 1S of the engine main body 1A via the transmission belt 34 as required, for example, at the time of start-up, acceleration, or running. It assists the driving force of the output shaft 1S. An output shaft 1S of the engine body 1A transmits power to wheels 36 via a power transmission mechanism 35. As shown in FIG. Further, the work device 37 can perform a predetermined work by operating using the power of the output shaft 1S. The predetermined work of the working device 37 includes, for example, plowing work using a tractor.

The type of the motor generator 11 is a so-called belt-driven starter generator system (BSG), in which the driving force of the output shaft 11G of the motor generator 11 assists the output shaft 1S of the engine main body 1A through the transmission belt 34. . However, the type of the motor generator 11 is not limited to this. ).

<First sealing member 40 and second sealing member 41>
As shown in FIG. 5, the casing 12 has a first hole 12H for passing the output shaft 11G. The output shaft 11G protrudes outside the casing 12 through the first hole 12H. A first seal member 40 is provided in the first hole portion 12H to keep airtightness between the casing 12 and the output shaft 11G. The first seal member 40 can prevent foreign matter outside the casing 12 from entering the internal space SP of the casing 12 through the gap between the casing 12 and the output shaft 11G.

Further, as shown in FIG. 5, the casing 12 has a second hole 12R for passing the wire harness 39 therethrough. The wire harness 39 is led to the outside of the casing 12 through the second hole 12R. A second sealing member 41 that maintains airtightness between the casing 12 and the wire harness 39 is provided in the second hole 12R. The second sealing member 41 can prevent foreign matter outside the casing 12 from entering the internal space SP of the casing 12 through the gap between the casing 12 and the wire harness 39 .

The casing 12 also serves as a part of an intake pipe system through which the intake air AR is drawn. Since the first sealing member 40 fills the first hole 12H of the casing 12 and the second sealing member 41 fills the second hole 12R of the casing 12, the internal space SP of the casing 12 is kept airtight. Therefore, the first sealing member 40 and the second sealing member 41 can prevent foreign matter from entering the motor generator 11 accommodated in the internal space SP of the casing 12 , thereby reducing the failure rate of the motor generator 11 .

The motor-generator cooling device 10 according to the present embodiment may further include a third pipe 24 indicated by two-dot chain lines in FIGS. 2 and 6 . One end of the third pipe 24 is connected to the other end 20B of the first pipe 20 . The other end of the third pipe 24 is connected to one end 21A of the second pipe 21 . That is, the third pipe consists of the first pipe 20 positioned upstream of the casing 12 in the flow of the intake air AR and the second pipe 21 positioned downstream of the casing 12 in the flow of the intake air AR. It is connected. The third pipe 24 functions as a bypass pipe, and guides part of the intake air AR that has flowed through the first pipe 20 to the second pipe 21 without passing through the casing 12, as indicated by the arrows shown in FIG. Another part of the intake air AR flows into the internal space SP of the casing 12 as described above. The intake air AR that has passed through the third pipe 24 merges with the intake air AR that has cooled the motor generator 11 in the internal space SP of the casing 12 at the connection between the second pipe 21 and the third pipe 24, and the engine main body 1A. supplied to the intake system of

According to this, since the casing 12 accommodates the motor generator 11 in the internal space SP, the pressure loss generated when the intake air AR passes through the third pipe 24 is smaller than the pressure loss that occurs in Therefore, when the third pipe 24 is provided, the negative pressure of the intake air AR supplied to the intake system of the engine body 1A is smaller than when the third pipe 24 is not provided. Therefore, the third pipe 24 can reduce the intake negative pressure of the engine body 1A, thereby improving the fuel efficiency of the engine body 1A.

As described above, according to the motor-generator cooling device 10 according to the present embodiment, the clean intake air AR from which foreign matter such as dust has been removed passes through the air cleaner 14, and the motor-generator 11 is covered and accommodated in the casing 12. pass through the interior of Therefore, the motor generator 11 can be cooled by the intake air AR while preventing foreign matter from entering the motor generator 11 . Motor generator 11 is cooled by intake air AR that flows into casing 12 while being covered and housed in casing 12 . Therefore, in the motor generator cooling device 10 according to the present embodiment, when the motor generator 11 is not housed in the casing 12, for example, the motor generator is arranged at a position where the cooling air sent from the cooling fan of the engine hits. , the low-temperature intake air can be brought into contact with a wide range of the high-temperature outer surface of the motor generator at a high flow rate, so that the motor generator 11 can be efficiently cooled. . As a result, it is possible to prevent the motor generator 11 from becoming hot, so that the motor generator 11 is prevented from being restricted in output due to the temperature rise, and the ability of the motor generator 11 to drive the hybrid engine 1 is reduced. can be suppressed.

Further, the casing 12 is fixed to the engine main body 1A. As a result, it is possible to suppress the casing 12 from vibrating with respect to the engine body 1A, thereby suppressing the generation of noise.

Intake air AR that has passed through the air cleaner 14 flows into the casing 12 through a first pipe 20 provided between the air cleaner 14 and the casing 12 . The intake air AR that has cooled the motor generator 11 inside the casing 12 is supplied to the intake system of the engine body 1A through a second pipe 21 provided between the casing 12 and the engine body 1A. Therefore, the intake air AR from which foreign matter has been removed by the air cleaner 14 cools the motor generator 11 inside the casing 12, and then is supplied to the intake system of the engine body 1A instead of being discharged to the outside of the engine body 1A. and effectively used. Further, since the intake negative pressure of the engine main body 1A can be used, the flow velocity of the intake air AR that cools the motor generator 11 inside the casing 12 can be increased. Thereby, the motor generator 11 can be efficiently cooled.

(Second embodiment)
Next, a second embodiment of the invention will be described with reference to FIG.
If the components of the motor-generator cooling device 10A according to the second embodiment are the same as the components of the motor-generator cooling device 10 according to the first embodiment described above with reference to FIGS. The description will be omitted as appropriate, and the differences will be mainly described below.

FIG. 7 is a block diagram schematically showing a hybrid engine according to a second embodiment of the invention.
In the first embodiment described above, one air cleaner is provided. That is, the air cleaner 14 shown in FIG. 5 is provided in the engine body 1A in order to supply new intake air AR to the engine body 1A. In the first embodiment, the entire amount of intake air AR supplied from the air cleaner 14 is introduced into the internal space SP of the casing 12 as part of the intake system to cool the motor generator 11, and then serves as the intake air AS to the engine. It is supplied to the intake system of the main body 1A. As described above with reference to FIGS. 2 and 6, when the third pipe 24 is provided, part of the intake air AR supplied from the air cleaner 14 passes through the third pipe 24 and flows into the casing 12. is guided to the second pipe 21 without passing through. Another part of the intake air AR supplied from the air cleaner 14 is introduced into the internal space SP of the casing 12 to cool the motor generator 11 and then guided to the second pipe 21 .

On the other hand, in the motor-generator cooling device 10A of the second embodiment shown in FIG. 7, two air cleaners, a first air cleaner 14T and a second air cleaner 70, are provided. The first air cleaner 14T corresponds to the air cleaner 14 of the first embodiment. The second air cleaner 70 is additionally provided separately from the first air cleaner 14T provided in the engine body 1A. In other words, the second air cleaner 70 is provided in an intake path different from the intake path of the first air cleaner 14T. The second air cleaner 70 is a smaller device than the first air cleaner 14T. The intake air AT cleaned by the first air cleaner 14T is supplied to the blow-by gas mixing joint 22 through the main pipe 60. As shown in FIG.

One end 20A of the first pipe 20 is connected to the second air cleaner 70 . The other end 20B of the first pipe 20 is connected to the casing 12 and communicates with the internal space SP of the casing 12 . Thus, the first pipe 20 is provided between the second air cleaner 70 and the casing 12, and can guide the intake air AR that has passed through the second air cleaner 70 to the internal space SP (see FIG. 3) of the casing 12. can.

On the other hand, one end 21A of the second pipe 21 is connected to the internal space SP of the casing 12 . The other end 21B of the second pipe 21 is connected to the middle of the main pipe 60 . Thus, the second pipe 21 is provided between the casing 12 and the main pipe 60 of the engine body 1A, and guides the intake air AR discharged from the internal space SP of the casing 12 to the intake system of the engine body 1A. can be done.

Specifically, the low-temperature, clean intake air AT that has passed through the first air cleaner 14T joins the clean intake air AR that has passed through the second pipe 21 in the main pipe 60, and flows through the blow-by gas mixing joint 22 and the turbocharger. 7. That is, after cooling the motor generator 11, the intake air AR that has passed through the second air cleaner 70 joins the intake air AT that has passed through the first air cleaner 14T and is supplied to the engine body 1A.

According to the motor-generator cooling device 10A according to the present embodiment, the intake path of the second air cleaner 70, in which the pressure loss due to the cooling of the motor-generator 11 inside the casing 12 is increased, is provided in the engine body 1A. It is provided as a dedicated intake path for intake air, separate from the intake path of the 1 air cleaner 14T. The intake air AR that has passed through the intake path of the second air cleaner 70 cools the motor generator 11, and then joins the intake air AT that has passed through the intake path of the first air cleaner 14T. The merged intake air further merges with the gas component G of the flow-by gas at the blow-by gas mixing joint 22 and is supplied as intake air AS to the intake system of the engine main body 1A. Since the intake path of the first air cleaner 14T has a pressure loss smaller than the pressure loss of the intake path of the second air cleaner 70, the negative pressure of the intake air supplied to the intake system of the engine body 1A is Smaller than if only an inspiratory path exists. Therefore, compared to the case where only the intake path of the second air cleaner 70 exists, the intake negative pressure of the engine body 1A can be reduced, thereby improving the fuel efficiency of the engine body 1A.

Further, the same effects as those described above regarding the motor-generator cooling device 10 according to the first embodiment can be obtained. Furthermore, the motor-generator cooling device 10A according to this embodiment may have the third pipe 24 described above with reference to FIGS. According to this, as described above with respect to the first embodiment, the third pipe 24 can reduce the intake negative pressure of the engine body 1A, thereby improving the fuel efficiency of the engine body 1A.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. Some of the configurations of the above embodiments may be omitted, or may be arbitrarily combined in a manner different from the above.

1: Engine 1A: Engine body 1P: Pulley 1S: Output shaft 2: Cylinder block 3: Cylinder head 4: Head cover 5: Oil pan 6: Exhaust gas aftertreatment device 7: Turbocharger 8 : radiator 9: cooling fan 10: motor generator cooling device 10A: motor generator cooling device 11: motor generator 11G: output shaft 11P: pulley 12: casing 12H: first hole 12R: third 2 holes 12S: streamlined portion 12T: tip 13: engine room 14: air cleaner 14T: first air cleaner 15: bolt 20: first pipe 20A: one end 20B: other end Part 21: Second pipe 21A: One end 21B: Other end 21C: Intermediate part 22: Blow-by gas mixing joint 23: Filter 24: Third pipe 25: Blower 26: Turbine 30 : Fins 33: Heat radiating part 34: Transmission belt 35: Power transmission mechanism 36: Wheels 37: Work device 39: Harness 40: First sealing member 41: Second sealing member 50: Engine ECU , 51: hybrid battery, 52: boost converter, 53: hybrid ECU, 60: main pipe, 70: second air cleaner, AR: intake air, AS: intake air, AT: intake air, G: gas component, SP: inside space

Claims (11)

A motor-generator cooling device for cooling a motor-generator,
a casing disposed between an air cleaner for purifying intake air supplied to the engine and the engine to cover and accommodate the motor generator;
A motor-generator cooling device, wherein the intake air flowing into the casing through the air cleaner cools the motor-generator. 2. A motor-generator cooling device according to claim 1, wherein said casing is fixed to said engine. 3. The motor-generator cooling device according to claim 1, wherein the casing has fins for heat radiation provided on an outer surface thereof. a first pipe provided between the air cleaner and the casing for guiding the intake air passing through the air cleaner to the inside of the casing;
a second pipe provided between the casing and the engine for guiding the intake air, which has cooled the motor generator inside the casing, to an intake system of the engine;
The motor-generator cooling device according to any one of claims 1 to 3, further comprising: 5. The motor-generator cooling device according to claim 4, further comprising a filter provided inside said second pipe for removing foreign matter contained in said intake air that has cooled said motor-generator. 6. The motor-generator cooling device according to claim 4, wherein the second pipe has a heat radiating portion that releases heat inside the second pipe to the outside of the second pipe. further comprising a third pipe connected to the first pipe and the second pipe for guiding part of the intake air flowing through the first pipe to the second pipe without passing through the casing; A motor-generator cooling device according to any one of claims 4 to 6. The casing has a first hole through which the output shaft of the motor generator passes and protrudes outside the casing,
8. The motor according to any one of claims 1 to 7, further comprising a first sealing member provided in the first hole and maintaining airtightness between the casing and the output shaft. Generator cooler. The casing has a second hole through which the wire harness of the motor generator passes and leads to the outside of the casing,
9. The motor according to any one of claims 1 to 8, further comprising a second sealing member provided in the second hole and maintaining airtightness between the casing and the wire harness. Generator cooler. The air cleaner is a second air cleaner provided in an intake path different from the intake path of the first air cleaner provided in the engine,
10. The intake air that has passed through the second air cleaner is combined with the intake air that has passed through the first air cleaner after cooling the motor generator, and is supplied to the engine. 1. A motor-generator cooling device according to claim 1. A hybrid engine including a motor-generator cooling device that cools a motor-generator,
The motor-generator cooling device includes:
a casing disposed between an air cleaner for purifying intake air supplied to the engine and the engine to cover and accommodate the motor generator;
A hybrid engine, wherein the intake air flowing into the casing through the air cleaner cools the motor generator.

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