WO2018030657A1 - Vehicle air compressor - Google Patents

Abstract

The present invention relates to a vehicle air compressor implementing simultaneous cooling for all of a journal bearing, a motor, and a thrust bearing of the air compressor, thereby enabling cooling efficiency of the air compressor to improve.

Description

Car air compressor

The present invention relates to a vehicle air compressor, and more particularly, to a vehicle air compressor that can improve the cooling efficiency of the air compressor by simultaneously cooling both the journal bearing and the motor and the thrust bearing of the air compressor.

In general, so-called gas bearings, which support the rotating shaft of high-speed rotary devices such as compressors, turbines, turbochargers, etc., which use air or gaseous fluids as working fluids without lubricating oil, are classified into static pressure bearings and dynamic pressure bearings. Can be classified as

A hydrostatic bearing is a type that obtains a load supporting capability by forcibly supplying air or gas pressurized by an external compressor between bearings, and can support the shaft even when the shaft does not rotate instead of requiring a pressure source (external pressurization device). Therefore, bearing damage due to solid friction can be avoided.

On the other hand, dynamic bearings are a type that obtains a load capacity by drawing pressure by increasing ambient air or gas between bearings as the shaft rotates, and does not require a separate source of pressure. As a result of the solid friction occurs, the bearing life is shortened. In order to prevent this, a coating of a solid lubricant is required on the bearing surface.

Among the hydrodynamic bearings, the foil bearings are formed by overlapping curved thin plates to form bearing surfaces, and are applied in the form of foil radial bearings supporting radial loads and foil thrust bearings supporting axial loads.

Among these, various examples of the foil thrust bearing implemented in the form of a thrust bearing to support an axial load are disclosed in Republic of Korea Patent Publication No. 10-0360240, Patent Registration No. 10-0590139, Registered Patent Publication No. 10-0954066 and the like.

The foil thrust bearing has a disc-shaped base pad having a through shaft for driving shaft passing through the center and fixed to the bearing housing, a bump foil that is radially attached to the upper surface of the base pad and is elastic to the axial force, A top foil is attached to the base pad while covering a plurality of bump foils and facing a thrust pad (also called a 'collar') of the drive shaft.

The foil thrust bearing draws the surrounding air between the thrust pad and the top foil of the drive shaft by rotation of the drive shaft to form an air layer to support the axial load of the drive shaft.

In the hydrostatic bearing, as described above, the pressure must be supplied by forcibly supplying pressurized air, so an external pressure source is required, but the drive shaft can be supported even at the initial start or when the drive shaft is not rotating, thereby avoiding bearing damage due to solid friction. have.

On the other hand, foil thrust bearings, which are dynamic bearings, do not require a separate source of pressure and are easy to apply.However, at the beginning or end of the drive shaft, the top foil and thrust pad inevitably generate solid friction, resulting in shortened bearing life. have. In addition, the production cost increases by applying a solid lubricant coating on the top foil and the thrust pad in order to reduce the damage caused by the solid friction, and even if the solid lubricant coating, the solid friction is still a problem.

However, such a conventional air compressor has a problem that the cooling performance is not good because the space around the bearing is narrow so that the cooling air passes through a narrow gap to cool the bearing and the motor. In particular, the temperature of the journal bearings located at the rear of the motor and the air compressor tends to rise sharply, causing damage to the bearings.

An object of the present invention is to provide a vehicle air compressor that can improve the cooling flow path to improve the durability and cooling efficiency of the bearing.

In order to achieve the above object, a vehicle air compressor according to a first embodiment of the present invention has an external appearance and includes a housing 100 having a coolant jacket 110 in which coolant is stored; A housing cover (200) coupled to one side of the housing (100) to support an impeller (400) for sucking outside air and positioned at a rear end of the impeller (400); The air inlet 310 located in the center of the housing 100 and the outside air is introduced therein, and the air sucked through the air inlet 310 by the impeller 400 is compressed by the impeller 400 before the outside. An impeller 300 including an air discharge port 330 discharged to the air; Is located inside the housing 100 A blower motor 600 which drives the impeller 400 to rotate and has a rotating shaft 650 in which a hollow is formed along an axial direction; A journal bearing 700 coupled to the rotation shaft 650 to rotatably support both ends of the rotation shaft 650; A thrust bearing (800) spaced apart from the journal bearing (700) and rotatably supporting one end of the rotating shaft (650); A cooling unit 900 provided to receive and cool the high temperature and high pressure air discharged from the air discharge port 330; The air outlet 330 and the cooling unit 900 and the housing cover 200 are connected to each other, and the cooling air cooled in the cooling unit 900 is provided to supply to the housing cover 200 Tube 1000; And cooling the journal bearing 700 and the thrust bearing 800 while the cooling air supplied to the housing cover 200 moves along the axial direction of the rotation shaft 650, and through the hollow of the rotation shaft 650. It includes an air cooling passage (P1) communicated to be moved.

One end of the tube 1000 is connected to the air outlet 330, and the other end of the tube 1000 is connected to the cooling unit 900. One end is connected to the cooling unit 900 and the other end includes a second tube 1020 extending toward the housing cover 200.

The first and second tubes 1010 and 1020 are provided with an insulating member 1002 on the outside to minimize heat loss of the cooling air.

The second tube 1020 is extended in a relatively short length compared to the first tube 1010.

The cooling unit 900 is characterized in that an intercooler is used.

The housing cover 200 includes a first passage 202 opened to supply cooling air supplied through the tube 1000 to the rotation shaft 650.

The first passage 202 is characterized in that the spiral groove 202a is formed along the axial direction.

A bearing housing 700a is provided to surround the outer side of the journal bearing 700 in the circumferential direction, and part of the cooling air supplied through the housing cover 200 is provided in the bearing housing 1110 in the blower motor 600. A journal bearing cooling passage 1112 formed to be supplied to the furnace; A motor cooling flow path 1114 opened adjacent to the journal bearing cooling flow path 1112 is provided to supply cooling air supplied from the housing cover 200 to the blower motor 600.

According to a second aspect of the present invention, there is provided a vehicle air compressor including: a housing 100 having a coolant jacket 110 forming an appearance and storing coolant; A housing cover (200) coupled to one side of the housing (100) to support an impeller (400) for sucking outside air and positioned at a rear end of the impeller (400); The air inlet 310 located in the center of the housing 100 and the outside air is introduced therein, and the air sucked through the air inlet 310 by the impeller 400 is compressed by the impeller 400 before the outside. An impeller 300 including an air discharge port 330 discharged to the air; Is located inside the housing 100 A blower motor 600 which drives the impeller 400 to rotate and has a rotating shaft 650 in which a hollow is formed along an axial direction; A journal bearing 700 coupled to the rotation shaft 650 to rotatably support both ends of the rotation shaft 650; A thrust bearing (800) spaced apart from the journal bearing (700) and rotatably supporting one end of the rotating shaft (650); A cooling unit 900 provided to receive and cool the high temperature and high pressure air discharged from the air discharge port 330; A second passage (120) formed in the housing (100) such that the cooling air cooled by the cooling unit (900) is supplied to the blower motor (600) via the housing (100); A tube provided to connect the air discharge port 330, the cooling unit 900, and the housing 100 to each other, and to supply cooling air cooled by the cooling unit 900 to the housing 100. 1000); And cooling air supplied to the housing 100 moves along the axial direction of the rotation shaft 650, and then cools the journal bearing 700 and the thrust bearing 800, and then moves through the hollow of the rotation shaft 650. It includes an air cooling passage (P1) communicated with each other.

One end of the tube 1000 is connected to the air outlet 330, and the other end of the tube 1000 is connected to the cooling unit 900. One end is connected to the cooling unit 900 and the other end includes a second tube 1020 extending toward the housing 100.

The cooling unit 900 is characterized in that an intercooler is used.

The second passage 120 is opened at a front end position of the coil 630b constituting the blower motor 600 so that the cooling air moved through the second passage 120 is transferred to the journal bearing 700 and the coil. It is characterized in that it is supplied toward (630b).

In the vehicle air compressor according to an embodiment of the present invention, after cooling the air of the high temperature and high pressure discharged from the air outlet 330, the cooling of the journal bearing or the blower motor and the cooling of the thrust bearing are performed simultaneously, thereby improving durability of the bearing. Cooling efficiency can be improved.

The vehicle air compressor according to the present embodiment can prevent the high temperature and high pressure air generated at the outlet of the impeller flow into the blower motor and the journal bearing.

1 is a side cross-sectional view showing an air cooling flow path of a vehicle air compressor according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the first passage shown in FIG. 1. FIG.

Figure 3 is a side cross-sectional view showing an air cooling passage according to a second embodiment of the present invention.

Hereinafter, with reference to the drawings, a vehicle air compressor according to an embodiment of the present invention will be described in detail. For reference, FIG. 1 is a side sectional view showing an air cooling flow path of a vehicle air compressor according to a first embodiment of the present invention, and FIG. 2 is an enlarged view of the first passage shown in FIG.

Referring to FIG. 1, the vehicle air compressor 10 according to an embodiment of the present invention includes a housing 100 forming an appearance and an impeller 400 coupled to a front of the housing 100 to suck air. The impeller support 200 and the impeller housing 300 to support the rear cover 500 is coupled to the rear of the housing 100, and installed in the housing 100 to drive the impeller 400 to rotate It is configured to include a blower motor 600.

The housing cover 200 is coupled to one side of the housing 100 to support the impeller 400 for sucking external air and is located at the rear end of the impeller 400.

The housing cover 200 corresponds to a position where the impeller 300 is positioned adjacent to the left side on the basis of the drawing and the lowest temperature among the exothermic temperatures according to the position is maintained while the air compressor is operated.

The housing cover 200 according to the present exemplary embodiment includes a first passage 202 opened to supply cooling air supplied through the tube 1000 to the rotation shaft 650. The first passage 202 opens the rotation shaft 650 vertically downward with respect to the drawing. In this case, the worker can easily process the first passage 202, thereby improving workability.

When cooling air is supplied to the first passage 202, the high temperature and high pressure air generated at the outlet of the impeller 400 may be blocked from being supplied to the blower motor 600 or the journal bearing 700, thereby improving cooling efficiency. Can be improved.

The first passage 202 may have a spiral groove 202a formed along the opened axial direction, and the groove 202a may improve the moving speed of the cooling air. Therefore, cooling to the rotating shaft 650 or the journal bearing 700 or the thrust bearing 800 where the high temperature is maintained can be performed quickly.

An air inlet 310 through which external air is introduced is formed at the front center of the impeller housing 300, and air outlets 330 are formed at both front sides. Impeller 400 is installed inside the impeller housing 300, the rotating shaft 650 of the blower motor 600 to be described later is coupled to the hollow penetrating the impeller 400. That is, the impeller 400 is supported by the rotation shaft 650. The air sucked through the air inlet 310 by the impeller 400 is compressed by the impeller 400 and discharged to the air outlet 330.

The rear cover 500 is coupled to the rear of the housing 100 to block the rotation shaft 650 from being exposed to the outside, and supports the end of the rotation shaft 650. A housing cover 850 is provided inside the rear cover 500 to support the rear bearing casing 700a 'which will be described later.

The blower motor 600 is installed adjacent to the inner circumferential surface of the housing 100 and has a hollow stator 630, a rotating shaft 650 installed through the hollow of the stator 630, and an outer circumferential surface of the rotating shaft 650. It consists of a rotor 610 to be coupled.

The stator 630 is composed of a plate 630a and a coil 630b and fixed, the rotor 610 is integrally formed on the outer circumferential surface of the rotation shaft 650, the rotation shaft 650 is formed through the hollow along the longitudinal direction It is a hollow shaft.

The rotating shaft 650 is rotatably supported by a journal bearing 700 installed at the rear of the impeller 400 in a state where one end is coupled to the hollow of the impeller 400, and the other end thereof is a thrust bearing 800. It is rotatably supported by the following (hereinafter, the end (left end) at which the impeller is located is defined to the front, and the end (right end) at which the thrust bearing is located to the rear is defined based on FIG. 1).

When the blower motor 600 is operated by receiving power from the outside, the rotary shaft 650 rotates to drive the impeller 400 while the outside air flows through the air inlet 310 to pass through the impeller 400. While being compressed and discharged to the air outlet 330.

The coolant jacket 110 is provided inside the housing 100 to cool the heat generated during the operation of the blower motor 600.

Cooling water jacket 110 has a form surrounding the housing 100 in the housing 100, the cooling water is supplied and stored therein. Since the coolant jacket 110 is provided adjacent to the blower motor 600, the coolant jacket 110 serves to cool the blower motor 600 through heat exchange with the coolant.

In addition to water-cooled cooling using the coolant jacket 110 for cooling the blower motor 600, an air-cooled cooling method for cooling the blower motor 600 using air is mixed.

The air cooling flow path P1 communicates with the main flow path communicating with the air inlet 310, the impeller 400, and the air discharge port 330. The air cooling flow path P1 is disposed between the front journal bearing 700 and the rotary shaft 650 from between the impeller 400 and the impeller support 200 and between the rear journal bearing 700 'and the rotary shaft 650. It is passed through the thrust bearing 800 to the rear cover 500. In addition, the air cooling flow path P1 communicates back to the air inlet 310 between the rear cover 500 and the rotation shaft 650 along the hollow passing through the center of the rotation shaft 650.

The air cooling flow path P1 cools the journal bearing 700 and the thrust bearing 800 while the cooling air supplied to the housing cover 200 moves along the axial direction of the rotation shaft 650. 650 is communicated to be moved through the hollow.

The above-described path is the air cooling flow path P1, and a part of the air compressed by the impeller 400 circulates along the air cooling flow path P1, cooling the front journal bearing 700 and cooling the blower motor 600. After cooling, the thrust bearing 800 is cooled and exhausted toward the air inlet 310 through the hollow.

The air temperature received by the motor 600 is lower when the thrust bearing 800 is disposed rearward than when it is disposed forward, and the air temperature received by the front journal bearing 700 is lowered. In addition, since the thrust bearing 800 is disposed at the rear, the thrust bearing 800 is located close to the coolant jacket 110, and thus the overall system temperature is lowered.

The cooling unit 900 according to the present embodiment is provided for cooling by receiving the high temperature and high pressure air discharged from the air discharge port 330. For example, an intercooler may be used, but the high temperature and high pressure air is used as the low temperature and low pressure air. Other components that undergo heat exchange can also be changed.

The tube 1000 according to the present embodiment connects the air discharge port 330 and the cooling unit 900 and the housing cover 200 to each other, and the cooling air cooled by the cooling unit 900 is It is provided to supply to the housing cover 200.

One end of the tube 1000 is connected to the air outlet 330, and the other end thereof is connected to the first tube 1010 connected to the cooling unit 900, and one end of the tube 1000 is connected to the other end thereof. And a second tube 1020 extending toward the housing cover 200.

The tube 1000 is a separate connection tube (not shown) or a connection tube (not shown) so that the connection portion connected to the air outlet 330 or the cooling unit 900 or the housing cover 200 is stably connected. ) May be provided. Since the connection tube or the connection tube is selectively applied to any one of the methods of being connected to or fixed to the tube 1000, the connection tube or the connection tube may be stably connected to the air outlet 330, the cooling unit 900, or the housing cover 200. Can be.

The first and second tubes 1010 and 1020 according to the present embodiment are provided with an insulating member 1002 on the outside in order to minimize the heat loss of the cooling air. The heat insulation member 1002 is provided to minimize heat loss due to ambient temperature of the cooling air moving through the first and second tubes 1010 and 1020. The insulating member 1002 serves to protect the first and second tubes 1010 and 1020 from foreign matter or contamination.

The second tube 1020 extends in a relatively short length compared to the first tube 1010. The second tube 1010 is a passage through which low-temperature cooling air moves, and thus the second tube 1020 is extended due to heat loss. There is a risk of temperature rise.

However, as described above, the heat loss to the outside may be minimized through the heat insulating member 1002, but it is preferable to extend the length shorter than the first tube 1010 for the layout or the movement of the cooling air.

The bearing housing 700a surrounding the outside in the circumferential direction of the journal bearing 700 according to the present embodiment is provided, and the bearing housing 700a includes a part of the cooling air supplied through the housing cover 200. The journal bearing cooling passage 1112 is formed to be supplied to the blower motor 600.

The journal bearing flow path 1112 extends to a predetermined length in the axial direction of the rotation shaft 650 and the present embodiment extends to the place where the coil 630b is located. The journal bearing flow path 1112 is formed for cooling the journal bearing 700. The journal bearing 700 may maintain a high temperature of 110 degrees or more, but is supplied through the journal bearing flow path 1112. When cooling is performed stably by air, a temperature lower than the aforementioned temperature is maintained.

A motor cooling flow path 1114 opened adjacent to the journal bearing cooling flow path 1112 so that the cooling air supplied from the housing cover 200 is supplied to the blower motor 600 separately from the journal bearing flow path 1112. It is provided.

The motor cooling channel 1114 has a kind of passage formed at a predetermined diameter toward the coil 630b so that cooling air is supplied as shown by an arrow in the drawing to perform cooling.

The cooling air moved through the air cooling flow path P1 described above is provided with a rear cover 500 after cooling the thrust bearing 800 as shown by a dotted arrow along the rotation shaft 650. Is moved to. And it is moved toward the air inlet 310 along the hollow of the rotating shaft 650.

An air compressor according to a second embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 3, the air compressor 10a according to the second embodiment of the present invention has a housing 100 having a coolant jacket 110 having a coolant therein and having a coolant therein, and the housing 100 of the housing 100. A housing cover 200 coupled to one side to support the impeller 400 to suck outside air and positioned at the rear end of the impeller 400, and an air inlet port located at the center of the housing 100 and into which outside air is introduced. An impeller 300 including an air discharge port 330 which is discharged to the outside after the air sucked through the air inlet 310 by the impeller 400 is compressed by the impeller 400, and Is located inside the housing 100 A blower motor 600 having a rotating shaft 650 having a hollow formed along an axial direction and driving the impeller 400, and coupled to the rotating shaft 650 to rotate both ends of the rotating shaft 650. A journal bearing 700 for supporting, a thrust bearing 800 spaced apart from the journal bearing 700 and rotatably supporting one end of the rotation shaft 650, and a high temperature discharged from the air outlet 330; The housing unit so that the cooling unit 900 and the cooling air cooled by the cooling unit 900 is supplied to the blower motor 600 via the housing 100 to receive and cool the air of high pressure. The second passage 120 formed at 100 and the air outlet 330 and the cooling unit 900 and the housing 100 are connected to each other, and the cooling air cooled by the cooling unit 900 is Tube 1000 provided to supply to the housing 100 ); And cooling air supplied to the housing 100 moves along the axial direction of the rotation shaft 650, and then cools the journal bearing 700 and the thrust bearing 800, and then moves through the hollow of the rotation shaft 650. It includes an air cooling passage (P1) communicated with each other.

Unlike the above embodiment, since the cooling air is supplied to the blower motor 600 along the second passage 120 after the cooling air is not supplied to the housing cover 200 but to the housing 100, the blower motor Along with stable cooling for 600, the cooling efficiency for the journal bearing 700 and the thrust bearing 800 can be improved.

One end of the tube 1000 according to the present embodiment is connected to the air outlet 330, and the other end thereof is connected to the first tube 1010 connected to the cooling unit 900 and one end to the cooling unit 900. And a second tube 1020 extending at the other end toward the housing 100.

The first and second tubes 1010 and 1020 according to the present exemplary embodiment are provided with an insulating member 1002 (see FIG. 1) at the outside to minimize heat loss of the cooling air. The heat insulation member 1002 is provided to minimize heat loss due to ambient temperature of the cooling air moving through the first and second tubes 1010 and 1020. The insulating member 1002 serves to protect the first and second tubes 1010 and 1020 from foreign matter or contamination.

The cooling unit 900 according to the present embodiment is provided for cooling by receiving the high temperature and high pressure air discharged from the air discharge port 330. For example, an intercooler may be used, but the high temperature and high pressure air is used as the low temperature and low pressure air. Other components that undergo heat exchange can also be changed.

The second passage 120 according to the present embodiment is opened at the front end position of the coil 630b constituting the blower motor 600 so that the cooling air moved through the second passage 120 is the journal bearing 700. ) And the coil 630b.

When the rotating shaft 650 is continuously rotated, the components constituting the blower motor 600 is heated to a predetermined temperature due to heat generation or heat transfer, so it is important to supply cooling air to the components to maintain the stable temperature. can do.

According to the present invention, the second passage 120 may be formed to continuously supply cooling air, thereby simultaneously cooling the journal bearing 700 and cooling the blower motor 600.

The cooling air moved through the air cooling flow path P1 moves to the position where the rear cover 500 is provided after cooling the thrust bearing 800 as shown by the dotted arrow along the rotation shaft 650. do. And it is moved toward the air inlet 310 along the hollow of the rotating shaft 650 it can be carried out a stable cooling.

The present invention can be used in the field of a vehicle air compressor that can improve the cooling efficiency of the air compressor by simultaneously cooling both the journal bearing of the air compressor and the motor and the thrust bearing.

Claims (12)

A housing (100) having a coolant jacket (110) forming an appearance and storing coolant; A housing cover (200) coupled to one side of the housing (100) to support an impeller (400) for sucking outside air and positioned at a rear end of the impeller (400); The air inlet 310 located in the center of the housing 100 and the outside air is introduced therein, and the air sucked through the air inlet 310 by the impeller 400 is compressed by the impeller 400 before the outside. An impeller 300 including an air discharge port 330 discharged to the air; Is located inside the housing 100 A blower motor 600 which drives the impeller 400 to rotate and has a rotating shaft 650 in which a hollow is formed along an axial direction; A journal bearing 700 coupled to the rotation shaft 650 to rotatably support both ends of the rotation shaft 650; A thrust bearing (800) spaced apart from the journal bearing (700) and rotatably supporting one end of the rotating shaft (650); A cooling unit 900 provided to receive and cool the high temperature and high pressure air discharged from the air discharge port 330; The air outlet 330 and the cooling unit 900 and the housing cover 200 are connected to each other, and the cooling air cooled in the cooling unit 900 is provided to supply to the housing cover 200 Tube 1000; And Cooling air supplied to the housing cover 200 moves along the axial direction of the rotating shaft 650 and cools the journal bearing 700 and the thrust bearing 800, and then moves through the hollow of the rotating shaft 650. A vehicle air compressor comprising an air cooling passage (P1) communicated with each other. The method of claim 1, One end of the tube 1000 is connected to the air outlet 330, and the other end of the tube 1000 is connected to the cooling unit 900. One end is connected to the cooling unit (900) and the other end of the vehicle air compressor comprising a second tube (1020) extending toward the housing cover (200). The method of claim 2, The first and second tubes (1010, 1020) is a vehicle air compressor having a heat insulating member (1002) on the outside to minimize the heat loss of the cooling air. The method of claim 2, The second tube (1020) is a vehicle air compressor, characterized in that extending in a relatively short length compared to the first tube (1010). The method of claim 1, The cooling unit 900 is a vehicle air compressor, characterized in that an intercooler is used. The method of claim 1, The housing cover (200) is a vehicle air compressor including a first passage (202) opened to supply the cooling air supplied through the tube (1000) to the rotation shaft (650). The method of claim 6, The first passage (202) is a vehicle air compressor, characterized in that the helical groove (202a) is formed along the axial direction. The method of claim 1, A bearing housing 700a is provided to surround the outer side of the journal bearing 700 in the circumferential direction, and part of the cooling air supplied through the housing cover 200 is provided in the bearing housing 1110 in the blower motor 600. A journal bearing cooling passage 1112 formed to be supplied to the furnace; And a motor cooling passage (1114) opened adjacent to the journal bearing cooling passage (1112) so that the cooling air supplied from the housing cover (200) is supplied to the blower motor (600). A housing (100) having a coolant jacket (110) forming an appearance and storing coolant; A housing cover (200) coupled to one side of the housing (100) to support an impeller (400) for sucking outside air and positioned at a rear end of the impeller (400); The air inlet 310 located in the center of the housing 100 and the outside air is introduced therein, and the air sucked through the air inlet 310 by the impeller 400 is compressed by the impeller 400 before the outside. An impeller 300 including an air discharge port 330 discharged to the air; Is located inside the housing 100 A blower motor 600 which drives the impeller 400 to rotate and has a rotating shaft 650 in which a hollow is formed along an axial direction; A journal bearing 700 coupled to the rotation shaft 650 to rotatably support both ends of the rotation shaft 650; A thrust bearing (800) spaced apart from the journal bearing (700) and rotatably supporting one end of the rotating shaft (650); A cooling unit 900 provided to receive and cool the high temperature and high pressure air discharged from the air discharge port 330; A second passage (120) formed in the housing (100) such that the cooling air cooled by the cooling unit (900) is supplied to the blower motor (600) via the housing (100); A tube provided to connect the air discharge port 330, the cooling unit 900, and the housing 100 to each other, and to supply cooling air cooled by the cooling unit 900 to the housing 100. 1000); And Cooling air supplied to the housing 100 moves along the axial direction of the rotary shaft 650 to cool through the hollow of the rotary shaft 650 after cooling the journal bearing 700 and the thrust bearing 800. A vehicle air compressor comprising a connected air cooling flow path (P1). The method of claim 9, One end of the tube 1000 is connected to the air outlet 330, and the other end of the tube 1000 is connected to the cooling unit 900. A vehicle air compressor including a second tube (1020) having one end connected to the cooling unit (900) and the other end extending toward the housing (100). The method of claim 9, The cooling unit 900 is a vehicle air compressor, characterized in that an intercooler is used. The method of claim 9, The second passage 120 is opened at a front end position of the coil 630b constituting the blower motor 600 so that the cooling air moved through the second passage 120 is transferred to the journal bearing 700 and the coil. Vehicle air compressor, characterized in that it is supplied toward (630b).

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