KR100698923B1 - Driving device - Google Patents

Abstract

The motor and the inverter are efficiently cooled in the drive unit in which the motor is used as the drive source and the inverter is integrated.

The drive device includes a drive device case 10, an electric motor M, and an inverter U attached to the drive device case, and has a cooling flow path between the drive device case and the inverter. The inverter is attached to the drive unit case via the partition 11 and chambers C ₃ and C ₄ constituting a two-layered cooling flow passage are formed between the partition and the drive unit case. Thus, the refrigerant flowing in the cooling passage acts as a two-step shielding means of heat transmitted from the motor to the inverter.

Driving device, electric motor, refrigerant

Description

DRIVE UNIT

1 is a system configuration diagram of a first embodiment applied to the hybrid drive system of the present invention,

Fig. 2 is a side view showing the positional relationship of the axes of the drive apparatus of the first embodiment,

3 is a circuit diagram showing a hydraulic system of the drive system of the first embodiment,

Fig. 4 is a perspective view showing the external appearance of a drive unit in which the inverter of the first embodiment is integrated,

5 is a schematic diagram conceptually showing a cooling system (cooling system) of the first embodiment,

Fig. 6 is an exploded view showing a detailed configuration of the first prototype at a top view,

Fig. 7 is an exploded view showing a shape of a part of the constituent member shown in Fig. 6,

8 is a sectional view showing the detailed structure of the first embodiment,

9 is a sectional view taken along the line I-I in Fig. 8,

10 is a schematic view conceptually showing a cooling system according to a second embodiment of the present invention,

11 is a schematic diagram conceptually showing a cooling system according to a third embodiment of the present invention,

12 is a cross-sectional view showing a fourth embodiment of the present invention,

13 is a cross-sectional view showing a fifth embodiment of the present invention,                 

14 is a schematic view conceptually showing a cooling system of a sixth embodiment of the present invention,

15 is a cross-sectional view showing the structure of a flow path,

16 is a schematic view conceptually showing a cooling system according to a seventh embodiment of the present invention,

17 is a schematic diagram conceptually showing a cooling system according to the eighth embodiment of the present invention.

Description of the Related Art

M: Motor (motor) U: Inverter (inverter)

10: drive device case 11: partition wall (partition wall)

12: Isolation means 12b: Communicating passage (communication passage)

C ₃ : first room (room) C ₄ : second room

F: flow path of the second refrigerant

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive apparatus using an electric motor as a power source, and more particularly to a drive apparatus for an electric vehicle and a cooling technique in a hybrid drive apparatus.

When the electric motor is used as the driving source of the vehicle, the load (load) applied to the electric motor largely fluctuates depending on the running state, and therefore cooling is required to cope with heat generation particularly at a high load. Further, the electric motor requires a control device (an inverter in the case of an AC fluctuation device) for the control. Since such a control device such as an inverter is connected to the electric motor by a power cable, it can be disposed at an appropriate position separated from the electric motor. However, the arrangement for integrating the motor with the electric motor may be adopted for convenience of mounting on the vehicle.

When the control device is integrated with the electric motor as described above, the control device not only raises the temperature due to the heat generated by its own element but also receives the heat of the electric motor through the drive device case, thus requiring cooling. For this reason, there is a problem in that a conventional heat sink is attached to a case of a conventional drive unit to form a cooling water path between the heat sink and the drive unit case to integrally cool the motor and the inverter (Refer to Japanese Unexamined Patent Application Publication No. 7-288949).

However, in the above-described conventional structure, since the same cooling water cools the inverter and the motor at the same time, there is a problem that the heat from the electric motor is transmitted to the inverter along the cooling water and the case.

Therefore, the present invention aims to prevent the heat of the electric motor from being transmitted to the inverter in a drive apparatus for cooling the electric motor and the inverter with a common coolant.

In order to achieve the above object, the present invention provides an electric motor comprising: an electric motor; a drive unit case accommodating the electric motor; an inverter attached to the drive unit case for controlling the electric motor; The inverter includes a first chamber facing the partition wall between the partition and the drive unit case, and a second chamber facing the drive unit casing, And two chambers are formed in two layers (layers) so as to communicate with the refrigerant channel (channel) in succession.

In this configuration, it is effective to adopt a configuration in which the first chamber and the second chamber are separated from each other by separate isolation means disposed on the partition wall side.

In the above configuration, the first chamber and the second chamber are connected to each other by a communication passage, and at the same time, the first chamber is communicated with the refrigerant passage It works.

Alternatively, in the above configuration, the first chamber and the second chamber may be connected in parallel to each other in the refrigerant flow path (flow path).

Further, in the above configuration, it is effective that the first chamber and the second chamber are separated from each other by separate isolation means which interferes with the contact between the partition and the drive unit case.

In addition, the isolating means is effective when adopting a structure made of a material having a low thermal conductivity.

In the above configuration, the partition wall may be formed in a lid shape that encloses the first chamber and the second chamber to cover the drive unit case, and the isolation means for separating the first chamber and the second chamber may be provided on the partition wall side It is also effective to employ a deployed configuration.

Further, in the above arrangement, the partition wall may have a lid shape that covers the first chamber and covers the drive unit case, and a separate isolating means for separating the first chamber and the second chamber from each other is provided at the junction portion of the drive unit case and the partition It is also possible to adopt a structure in which a support structure is interposed between the drive unit case and the partition wall to prevent contact between the drive unit case and the partition wall.

In the above configuration, the first chamber and the second chamber may be separated from each other by the isolating means arranged on the inverter side from the junction surface of the partition and the drive unit case.

<Examples>

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, Fig. 1 shows a system configuration when the present invention is applied to a hybrid drive system. This apparatus comprises an internal combustion engine (hereinafter referred to as an engine) E / G, an electric motor M, a generator G and a differential gear G, And a planetary gear set P having a single pinion configuration and a counter gear mechanism T are inserted between the planetary gear set P and the planetary gear set P, And a one-way clutch O and a brake B are additionally provided.

2, the drive system includes an engine E / G and a generator G on a first axis X ₁ , a motor M on a second axis X ₂ , Axis structure in which the counter gear mechanism T is disposed on the third axis X ₃ and the differential device D is disposed on the fourth axis X ₄ . The engine E and the generator G are connected to the differential device D through the planetary gear set P and the counter gear mechanism T and the motor M is connected to the counter gear mechanism T to the differential device D.

The motor M is connected to the counter gear mechanism T by engaging the counter drive gear 42 fixed to the rotor shaft 21 with the counter driven gear 44 And the engine E is connected to the generator G and the counter gear mechanism T by connecting the output shaft 71 to the carrier 62 of the planetary gear set P, And is connected to the engine E / G and the counter gear mechanism T by connecting the rotor shaft 31 to the sun gear 61 of the planetary gear set P. [ The ring gear 63 of the planetary gear set P is connected to the counter drive gear 43 on the first axis X ₁ engaged with the counter driven gear 44 of the counter gear mechanism T, Respectively. The counter gear mechanism T is configured to include a counter driven gear 44 fixed to the counter shaft 41 and a differential drive pinion gear 45, Is engaged with the differential ring gear 52 fixed to the differential case 53 of the differential device D. The differential device D is connected to a wheel (not shown) as is well known.

The one-way clutch O connects the inner race to the carrier 62 so as to stop the reverse rotation of the carrier 62 against a reaction force to the drive case 10, and an outer race connected to the drive unit case 10. The brake B is configured to engage the rotor shaft 31 of the generator G with the drive unit case 10 if necessary so that the brake B is rotated by the reaction torque when the generator is not required, And a brake hub is connected to the rotor shaft 31 so that a friction engaging member is engaged with the brake hub and the drive unit case 10 have.                     

In the drive system having such a configuration, although the motor M and the wheels have a deceleration relation of the gear ratio distribution by the counter gear mechanism T, the power transmission phases are directly connected to each other The engine E / G and the generator G are indirectly connected to each other via the planetary gear set P with respect to the counter gear mechanism T and the power transmission phase. Thus, by adjusting the power generation load of the generator G with respect to the ring gear 63 receiving the running load of the vehicle via the differential device D and the counter gear mechanism T, (Battery charging) can be appropriately adjusted. Since the reaction force applied to the carrier 62 is reversed by driving the generator G with the motor, the carrier 62 is engaged with the drive unit case 10 via the one-way clutch O at that time The output of the generator G can be transmitted to the ring gear 63 and the drive force at the time of vehicle start due to the simultaneous output of the motor M and the generator G (running in a parallel mode).

Next, Fig. 3 shows a circuit configuration of a hydraulic system (system) of the hybrid drive system. In this circuit, an oil sump 90 is used as a bottom portion of the drive unit case 10, and an electric oil pump 90 for drawing up oil from the oil sump 90 via a strainer 91 A regulator valve 92 for generating a line pressure of the circuit, a brake valve 93 for controlling engagement and disengagement of the brake B, a switching control of the brake valve 93, And a solenoid valve 94 for solenoid valve 94. The oil is sent to the oil supply passage L ₂ of the circulation path as refrigerant and lubricant oil for cooling the motors M and the generators G, And a control circuit for controlling the continuous communication and the drain communication to the line pressure passage (L ₁ ) of the supply passage (L ₃ ) of the hydraulic servo of the hydraulic servo (B).

The line side pressure line L _{1 of the} oil pump O / P is branched and branched so that one side is connected to the supply passage (oil passage) L ₂ of the circulation path via the regulator valve 92 And the other is connected to the supply passage L ₃ of the hydraulic servo of the brake B via the brake valve 93. The line pressure passage L ₁ and the supply passage L ₂ are connected to each other via the orifice R ₁ . The supply flow path L ₂ of the circulation path is branched and connected to each of the orifices R ₂ and R ₃ via the in-case flow path L ₄ indicated by a dotted line in the drawing, to the rotor shaft 31 of the generator G, And the other branch further branches off from the in-case flow path L ₅ and flows through the orifices R ₄ and R ₅ to the oil (coolant) for the motor M provided at the upper portion of the drive unit case, And is connected to the tank C ₁ and the oil (refrigerant) tank C ₂ for the generator G.

Cooling of the motor (M) is a coolant tank (C ₁₎ of the case the flow path (L ₆₎ through the shaft after the rotor 21 is the path in the guide oil to the (L ₇₎ detailed flow passage (油路) cross-sectional configuration referring to indicate passing the flow path (L _8), the rotor (22), towards the coil end (20a) of the stator (20) from the end (終端) of the flow path is discharged by centrifugal force according to the rotation of the rotor 22. The oil discharged from both ends of the rotor 22 is blown to the coil ends 20a at both ends of the stator 20 by cooling the rotor side by passing the oil passage in the rotor 22 in this manner, The cooling by the load and the oil directly discharged from the coolant tank C ₁ are blown to the stator core 20b and the coil end 20a. In the same way, the cooling of the generator G is performed such that the oil discharged from the oil passage in the rotor shaft 31 through the oil hole in the radial direction by the centrifugal force passes through the coil ends 30a and the oil discharged from the coolant tank C ₂ is blown to the stator core 30b and the coil end 30a. In this way, the motor M and the generator G are cooled so that the oil whose temperature has risen due to the heat exchange falls (drops) to the bottom of the drive unit case or flows down along the case wall, (Recovered) in the storage unit 90.

4 shows an external appearance of the drive device in a perspective view. In an outer wall corresponding to the outside of the oil sump of the drive unit case 10 made of an aluminum material or the like, A plurality of heat dissipating fins 10f are formed, and oil recovered in the oil sump is air-cooled by an air stream in the engine room. In Fig. 4, reference numeral 10a denotes a motor housing portion in the drive unit case, 10b denotes a generator housing portion, and 10c denotes a differential device housing portion. As shown in FIG. 4, the inverter U for controlling the motor and the generator (hereinafter referred to as the inverter for the motor and the generator for the inverter) is attached to the upper side of the drive unit case 10, And is integrated with the device case 10.

In this specification, the inverter includes a switching transistor or a capacitor for converting a direct current of a battery power source into an alternating current (a three-phase AC when the motor is a three-phase AC motor) Means a power module composed of circuit elements of a plurality of circuit boards and a circuit board on which the circuit elements are arranged.

Fig. 5 conceptually illustrates the cooling system of the drive system including the vertical positional relationship. This cooling system is constituted by a circulation path (indicated by a shaded line in the drawing) L for making the oil the first refrigerant and a flow path (a hollow line in the drawing) F). Therefore, the present invention is applied to a flow path that uses this cooling water as a refrigerant.

The oil as the first refrigerant is sucked from the oil sump 90 through the strainer 91 by the oil pump O / P and is supplied to the generator G and the motor M in the forward path as described above (Bottom) of the housing portion of the drive unit case 10 and a bottom portion of the housing portion of the motor M so as not to contact the lowermost portion of the rotors 22 and 32, Level, and is returned to the oil sump 90 by an overflow, thereby completing one cycle of circulation.

On the other hand, the cooling water as the second refrigerant is made of aluminum or the like having a good thermal conductivity, such as the drive unit case 10, And the heat transfer wall 13 in the oil circulation path L in the drive unit case 10 is defined as a flow path F so that the first refrigerant And constitutes a cooling system (system) for cooling the oil of the engine. Wall separation means 12 is arranged between the partition 11 and the heat transfer wall 13 and the flow passage F of the cooling water flows between the partition 11 and the isolation means 12 The inverter U is cooled by heat exchange between the partition walls 11 and the oil flowing through the heat transfer wall 13 when flowing between the isolator 12 and the heat transfer wall 13 of the drive unit case 10 And the oil is cooled by heat exchange of the oil.

Fig. 6 is an exploded perspective view showing in detail the connection structure of the power module constituting the drive unit case 10 and the inverter U, and Fig. 7 is a view showing the same structure. Figs. 8 and 9 show the same structure cut into different cross-sections. Fig. In this embodiment, the refrigerant tanks C ₁ and C ₂ are provided above the motor housing portion of the drive unit case 10. The refrigerant tank is divided into a refrigerant tank (C ₁ ) for a motor and a refrigerant tank (C ₂ ) for a generator. Supply of the oil to both of these (兩) coolant tank passage of the first coolant leading to the (C _1, C ₂₎ (see Fig. 3) (L ₅₎ has, during the positive (兩) refrigerant tanks (C _1, C ₂₎ The orifices R ₄ and R ₅ having different diameters for distributing the amount of the power to be distributed in accordance with the thermal load of the motor M and the generator G are interposed therebetween, And is opened at the side surfaces of the refrigerant tank at the inlets 10d and 10e. Dams 10i and 10j are provided at positions close to the outlet sides of both refrigerant tanks. Downstream of the dams 10i and 10j of the both coolant tanks, there is an oil outlet 10g (10g) which opens at the bottom surface of the coolant tank and functions as an orifice for adjusting the discharge flow rate in accordance with the setting of the bore diameter , 10h are formed.

As shown in Figure the subsequent path of the first refrigerant to 9, the outlet (10g) of the oil is the stator shaft of the motor (M) in the case the flow path (L ₆₎ to the passage (流路) formed in the drive case ( 21 is connected to the in-shaft flow path L ₇ at its shaft end. Chuknae flow path (L ₇₎ is in communication with a main sphere (周回溝) formed in the end plate (端板) (22b) which supports via a radial direction oil hole in the core (22a) at both ends (兩端) of the motor (M) , and subsequently communicated to both ends of the main circuit obtained by passing a flow passage (L ₈₎ in a plurality of rotor in the axial direction formed in the core (22a), and end (終端) at the discharge hole (22c) formed in the end plate (22b). Further, in the drawing, but is drawn so as to pass a single rotor flow path is released balls (22c) at both ends of the (L _8), specifically, each rotor flow path (L ₈₎ for each one (一端) only alternately discharge hole of the left and right end plate (22c) is in a through arrangement, it is possible to prevent the fire average of the oil flowing through the flow passage (L _8), each rotor. Further, the outlet 10h of the oil passes over the stator of the generator G via the oil passage in the case as shown in Fig.

The heat transfer wall 13 that blocks the upper opening of the refrigerant tank C ₁ and C ₂ has a plurality of cooling fins 13 a and 13 b on the upper and lower surfaces thereof and has the same thermal conductivity as that of the drive device case 10 An aluminum member or the like. In this embodiment, the member is different from the drive unit case 10 because of convenience in processing, and is fixed to the drive unit case 10 by bolts or the like. The oil cooling fins (13b) of the side is a pin height changes to follow the shape of the bottom of the refrigerant tank (C _1, C ₂₎ 8, the refrigerant tank, the heat transfer wall (13) (C ₁₎ The arrangement in which the pins are disposed in the whole area, and improvement of the heat transfer is being promoted.

The partition 11 with the power module constituting the inverter U constitutes a cooling section of the inverter U. In this embodiment, a heat sink is incorporated to improve heat exchange efficiency, And a narrow two-row parallel flow path passing through the partition 11, turning back and forth as shown in FIG. 7. In order to flow the cooling water as the second refrigerant along the flow path, the isolating means 12 is provided so as to abut the lower surface of the partition 11. In this embodiment, since the isolation means 12 is made of a material having a high thermal insulation property, the isolation means 12 is configured separately from the case and the partition. However, when the isolation means 12 is made of the same material, It is also possible to use a configuration. A first chamber C ₃ facing the side of the partition 11 as shown in FIG. 5 and a second chamber C ₂ facing the side of the drive unit case 10 are provided between the partition 11 and the drive unit case 10 the second chamber (C _4), the isolation means and defining (劃定) to the second floor off by 12, they both (兩) yarn (C _3, C ₄₎ through one after another via a communication path to the (12b) The flow path is constituted.

The oil sent from the respective inlets 10d and 10e to the refrigerant tanks C ₁ and C ₂ is blocked by the respective dams 10i and 10j and becomes high for a certain period of time, The amount exceeding the dams 10i and 10j flows from the outlets 10g and 10h to the motor M and the generator G after the heat exchange with the oil cooling fins 13b on the lower side, Is adjusted according to the required flow amount (oil amount). On the other hand, the coolant enters into the heat sink, that is, the first chamber (C ₄₎ of the drive unit case 10 through the hole (12a) of the isolation member 12 from the inlet (10k) partition 11 which is open at the upper surface of the The heat transfer wall 13 and the isolating means 12 pass through the communication passage 12b made of a hole provided in the isolating means 12 in this mode after the heat exchange is sufficiently performed after passing through the route, The water flowing along the heat transfer wall 13 while being in contact with the water cooling pin 13a on the upper surface side of the heat transfer wall 13 and passing around the opening of the coolant tank, Is guided out of the drive unit case (10) through the cooling water outlet (101). Thus, the cooling water discharged from the drive unit case 10 is cooled by the engine cooling radiator or the dedicated cooler and recirculated.

Thus, according to the first embodiment, since the refrigerant flow path between the motor M and the inverter U is composed of two layers, that is, the side of the motor M and the side of the inverter U , The cooling water flowing in the cooling water acts as a two-layer heat insulating layer, and the heat on the side of the motor (M) which is higher in temperature than the inverter (U) side can be absorbed by the intermediate cooling water in two steps, M to be difficult to be transmitted to the inverter (U). As a result, the temperature rise of the inverter (U) due to the integration of the motor (M) and the inverter (U) can be prevented. Heat transfer resistance is generated when the heat from the motor M is transmitted to the isolating means 12 because the isolating means 12 is disposed on the side of the partition 11, It is possible to make the heat from the motor M difficult to be transmitted to the cooling water flowing through the first chamber (C ₃ ) on the side of the first chamber (C ₃ ).

Since the cooling water is in the order of first cooling the power module constituting the inverter U via the partition 11 and then cooling the motor M and the generator G via the oil, It is possible to prevent the temperature of the cooling water from rising until the temperature of the cooling water exceeds the heat resistant temperature of the inverter U without directly exchanging heat with the motor M and the generator G or with the inverter U at the same time. Therefore, the inverter U, the motor M, and the generator G can be efficiently cooled, and the cooling performance can be improved. In addition, since the flow path of the cooling water is formed in the space between the inverter U and the drive unit case 10 integrated with each other, a complicated configuration in which a dedicated refrigerant path is provided around the drive device case Can be avoided, leading to an improvement in space efficiency and an inexpensive manufacturing cost. The refrigerant tank is separated into the refrigerant tank C ₁ for the motor and the refrigerant tank C ₂ for the generator so that the amount of oil to be supplied to each of the motor M and the generator G from the refrigerant tank can be individually adjusted An appropriate amount of oil is supplied to the motor M and the generator G by adjusting the flow rate ratio to the orifices R ₄ and R ₅ having different diameters so as to effectively cool the respective motors M and G in accordance with the cooling temperature demand . The oil after heat exchange in the refrigerant tanks C ₁ and C ₂ is guided to the rotor side of the motor M and the generator G so that the oil from the inner circumference side using the oil discharged by the centrifugal force from the rotor It is possible to cool the other stators 20 and 30, and it is possible to perform efficient motor cooling with efficient use of the circulation of the oil as effectively as possible.

In this first embodiment, the flow of the cooling water as the second refrigerant is changed from the first chamber (C ₃ ) on the inverter (U) side to the second chamber (C3) on the refrigerant tank side, Although the relationship of sangharyu flow to be returned to the chamber (C ₄₎ side, the flow may be a parallel flow (流). Fig. 10 shows this second embodiment in a schematic view similar to Fig. In this configuration, the first chamber (C ₃ ) facing the side of the partition 11 vertically divided by the isolation means 12 and the side of the circulation path (L) of the first refrigerant of the drive unit case 10, And the second chamber (C ₄ ) facing the second refrigerant passage (13) is a flow path connected in parallel to the circulation path of the second refrigerant. The rest of the configuration is substantially the same as that of the first embodiment, so that the same reference numerals are given to the corresponding members to substitute the description (this point is the same for each subsequent embodiment).

In this case, when the cooling water flows independently of the first chamber (C ₃ ) and the second chamber (C ₄ ), the heat of the motor (M) is transmitted to the inverter (U) through the cooling water . Further, since cooling water of a lower temperature can be made to flow to the side of the second chamber (C ₄ ) facing the heat transfer wall (13) of the refrigerant tank, the cooling efficiency of the motor (M) and the generator (G) .

Next, Fig. 11 shows a third embodiment in which the upstream and downstream relationships of the first chamber (C ₃ ) on the inverter (U) side and the second chamber (C ₄ ) on the coolant tank side are reversed. In this embodiment, the cooling water as the second refrigerant first flows through the circulation path (L) side of the first refrigerant of the drive unit case 10, that is, the side of the second chamber (C ₄ ) facing the heat transfer wall 13, 13 to cool the oil and then cool the power module of the inverter U by flowing a first chamber C ₃ facing the upper and lower partition walls 11 side by the isolation means 12.

The cooling water as the second refrigerant does not directly cool the motor M and the generator G but becomes a cooling structure for sequentially cooling the oil and the inverter U for circulating and cooling them, Since the heat from the generator M and the generator G is heat-exchanged with the cooling water through the oil, the heat is relieved against the direct heat transfer, and the advantage that the temperature is prevented from rising until the cooling water exceeds the heat- Can be obtained.

Next, Fig. 12 shows a fourth embodiment in which the structure of the members constituting the flow channel is changed, while the structure of the second coolant channel is adopted as in the first or third embodiment. In this embodiment, the wall member 14 is separately fitted between the drive unit case 10 and the partition wall 11, and further separate isolation is provided between the partition wall 11 and the upper wall member 14. [ A configuration in which the means 12 is fitted is adopted. In this case, the upper wall member 14 may be made of aluminum material of the same type as the drive unit case 10 or the partition wall 11, or may be made of a material having a high thermal insulation property, You may. In this embodiment, the first and second coolant tanks C ₁ and C ₂ are provided on the upper side of the motor M and the generator G, respectively, .

When adopting such a configuration, an isolation means 12, which is a separate member, is disposed between the drive unit case 10 and the partition 11 so that the isolation means 12 and the case 10 or the partition 11 It is possible to obtain an effect of reducing the amount of heat directly transmitted from the drive unit case 10 to the partition 11 through the contact portions thereof.

Fig. 13 also shows a fifth embodiment in which the structure of the members constituting the flow channel is changed, while adopting the second refrigerant flow path configuration similar to that of the first or third embodiment. In this configuration, a configuration in which separate isolation means 12 are interposed between the partition 11 and the drive unit case 10 is employed. The isolating means 12 in this case has a constitution in which the driving device case 10 and the upper wall portion 12c constituting the connecting portion of the partition 11 are integrally formed.

The isolation means 12 having a high thermal insulation property is disposed between the drive unit case 10 and the partition 11 so that the isolation means 12 and the case 10 or the partition 11 The heat transferred from the drive device case 10 to the partition 11 through the contact portions can be reduced.

However, in each of the above embodiments, the cooling method for cooling the motor M and the generator G side by oil is used as the oil and the oil is cooled by the cooling water as the second refrigerant for cooling the inverter U in a two- The present invention may be embodied in such a manner that the motor M and the generator G and the inverter U are cooled by a single coolant. Figs. 14 and 15 show a sixth embodiment using such a cooling system. 14, the downstream side of the flow path passing through the first and second chambers C ₃ and C ₄ is the downstream side of the motor M and the generator (Flow path) in the drive unit case 10 that cools the air bag G. As shown in Fig.

15, the partition 11 in this embodiment has a lid shape that covers the first case C ₃ and the second chamber C ₄ and covers the driving device case 10, that is, And a separating means 12 for separating the first chamber C ₃ and the second chamber C ₄ from each other is disposed on the side of the partition 11. In this case, the isolation means 12 may be separate from the partition 11 as shown in the figure, or may be integral with the partition 11. With this configuration, the first chamber (C ₃ ) and the second chamber (C ₄ ) are separated from each other by the isolating means (12) arranged on the inverter (U) side from the junction surface of the partition (11) . The downstream side of the flow path passing through the first and second chambers C ₃ and C _{4 is} connected to the flow path in the wall of the drive unit case 10 and is connected to the outer periphery of the stator 20 of the generator G through the flow path (F _G) the passed, then flow (F _M) is formed along the outer periphery of the stator 30 of the motor (M) in the peripheral wall of the same drive unit case 10 is formed along the外周), and finally driving the Is guided to a portion of the apparatus case 10 adjacent to the partition 11, and is terminated at an outlet opening (opening) formed therein.

It is possible to configure the flow path of the cooling water between the drive unit case 10 and the partition 11 mainly on the side of the partition 11 so that the structure of the drive unit case 10 The inverter U, the motor M, and the generator G can be cooled down to a simple structure. Since the isolating means 12 is located on the side of the partition 11, heat is generated when the heat from the motor M and the generator G is transmitted to the isolating means 12, It is possible to make the heat from the motor M and the generator G difficult to be transmitted to the refrigerant flowing through the first chamber C ₃ . Since the isolating means 12 is located on the side of the inverter U with respect to the joint surface of the drive apparatus case 10 and the partition 11, the isolating means 12 is provided on the side of the motor M and the generator G, The barrier ribs 11 are extended, so that the heat capacity of the barrier ribs 11 can be increased correspondingly.

As described above, even in the method of cooling the motor M, the generator G and the inverter U by a single coolant, the flow path passing through the first and second chambers C ₃ and C ₄ , Can be changed. 16 shows a state in which the first chamber C ₃ facing the partition wall 11 and the second chamber C ₄ facing the drive device casing 10 are connected to each other in parallel in the refrigerant flow path The second embodiment is shown in a schematic form. In this case, the same drive apparatus casing wall flow path as that of the sixth embodiment is formed, and this flow path is connected in parallel with the flow path passing through the first and second chambers (C ₃ , C ₄ ) As shown in Fig.

17 shows an eighth embodiment in which the upstream and downstream relationships between the first chamber C ₃ on the inverter U side and the second chamber C ₄ on the refrigerant tank side are reversed. In this case also, the same drive unit case wall flow path as that of the sixth embodiment is formed, and this flow path is formed on the upstream side of the flow path passing through the first and second chambers (C ₃ , C ₄ ) They are connected in series. In this form, the cooling water as a refrigerant is first transmission casing 10 via the case 10, the walls when flowing through the intramural passage running the motor (M) and the generator (G) heat exchange, and the second chamber (C ₄₎ Exchanges heat with the motor M and the generator G through the heat transfer wall when the first chamber C ₃ flows and performs the heat exchange of the power module of the inverter U via the partition 11 when flowing through the first chamber C ₃ However, in this case also, the heat of the motor M and the generator G is mitigated by interposing the cooling water.

Although the present invention has been described based on the eight embodiments, the present invention is not limited to these embodiments, and various specific configurations can be modified within the scope of the claims. For example, in the above embodiments, the second refrigerant is uniformly exemplified as the cooling water, but it is also possible to use another suitable refrigerant.

In the configuration according to the first aspect of the present invention, since the refrigerant flow path between the electric motor and the inverter is composed of two layers, that is, the electric motor side and the inverter side, the refrigerant flowing therein serves as a two- The heat from the electric motor side which is higher in temperature can be absorbed by the intermediate (intermediate) refrigerant in two stages, thereby preventing the heat from the electric motor from being transmitted to the inverter. Accordingly, the temperature rise of the inverter due to the integration of the motor and the inverter can be prevented.                     

Further, in the structure according to claim 2, since the isolating means is disposed on the side of the partition wall, heat transfer resistance is generated when heat from the electric motor is transmitted to the isolating means, and the refrigerant flowing in the first chamber on the inverter side It is possible to make the heat from the electric motor difficult to be transmitted to the electric motor.

Next, in the configuration according to claim 3, it is also possible to prevent the heat of the electric motor from being transmitted to the inverter via the refrigerant, by allowing the refrigerant to cool the inverter after cooling the electric motor.

Next, in the configuration according to claim 4, it is also possible to prevent the heat of the electric motor from being transmitted to the inverter through the refrigerant, because the refrigerant flows independently of the first and second chambers.

In addition, in the configuration according to claim 5, since the isolation means, which is a separate member, is disposed between the drive unit case and the partition wall, thermal resistance is generated between the isolation means and the drive unit case and the partition, Can reduce the heat transferred directly through their contacts.

In the configuration according to claim 6, since the heat transfer from the second chamber to the first chamber is blocked by the heat transfer resistance by the isolating means, the cooling performance can be further improved.

Further, in the structure according to claim 7, since the flow path of the refrigerant can be mainly formed on the side of the partition wall, the structure of the drive device case can be simplified and the inverter and the motor can be cooled by a simple structure have. In addition, since the isolating means is located on the partition wall, a heat transfer resistance is generated when the heat from all motors is transmitted to the isolating means, and the heat from the electric motor is transmitted to the refrigerant flowing in the first chamber on the inverter side It can be difficult.

In addition, in the configuration according to claim 8, since the isolation means, which is a separate member, is supported between the drive unit case and the partition wall, heat transfer resistance is generated between the isolation means and the case and the partition, Can reduce the heat transferred directly through their contacts.

In the structure according to claim 9, since the isolation means is located on the inverter side with respect to the joint surface of the drive device case and the partition wall, the partition walls extend from the isolation means to the drive device case side, Temperature rise on the inverter side can be suppressed.

Claims (12)

An electric motor, A drive device case accommodating the electric motor, An inverter attached to the drive unit case for controlling the electric motor; A drive device comprising a flow path of a coolant for cooling an electric motor, The inverter is attached to the drive unit case through a partition wall, A first chamber facing the partition wall and a second chamber facing the drive unit case are formed in two layers (layers) so as to communicate with the refrigerant passage (flow passage) in series between the partition and the drive unit case Wherein The driving device according to claim 1, wherein the first chamber and the second chamber are separated by separate isolation means disposed on the partition wall side. The refrigerating machine according to claim 1 or 2, wherein the first chamber and the second chamber are communicated with each other by a communication passage, and at the same time, the first chamber is communicated with the refrigerant passage Gt; The driving device according to claim 1 or 2, wherein the first chamber and the second chamber are connected to each other in parallel in the refrigerant flow path. 2. The drive system according to claim 1, wherein the first chamber and the second chamber are separated by separate isolation means which obstruct contact between the partition and the drive case. The drive system according to claim 2, wherein the isolation means is made of a material having a low thermal conductivity. The apparatus as claimed in claim 1, wherein the partition wall is formed in a lid shape that covers the first and second chambers and covers the drive unit case, and the isolation means for separating the first chamber and the second chamber is disposed on the partition wall side Gt; The apparatus as claimed in claim 1, wherein the partition is formed as a lid which covers the first chamber and covers the drive unit case, and a separate isolation means for separating the first chamber and the second chamber is provided at the junction of the drive unit case and the partition And a drive device supported between the drive device case and the partition so as to obstruct the contact. The drive system according to claim 1, wherein the first chamber and the second chamber are separated by an isolating means disposed on the inverter side from a junction surface of the partition and the drive case. 4. The drive system according to claim 3, wherein the first chamber and the second chamber are separated by separate isolation means which interferes with the contact between the partition and the drive case. 5. The drive system according to claim 4, wherein the first chamber and the second chamber are separated by separate isolation means which interferes with the contact between the partition and the drive case. 6. The driving device according to claim 5, wherein the isolation means is made of a material having a low thermal conductivity.

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