JP2019166915A - Front part unit mounting structure of electric vehicle - Google Patents

Abstract

Provided is a front unit structure of an electric vehicle that can efficiently separate gas from cooling water for cooling electrical components while stacking a plurality of electrical components vertically in a motor room. A front unit mounting structure of an electric vehicle includes an electric unit (30) and a motor unit mounted in a motor room (1) formed below a hood (12) lowered forward and below a cross member (8) extending in a vehicle width direction. 20 and a cooling path connecting the electric unit 30 and the motor unit 20 and a degas tank 93 for separating gas from the cooling path. The degas tank 93 is connected to an outlet of a cooling path provided in the electric unit 30. The electric unit 30 is disposed at a position that is high and vertically overlaps with a vehicle body part that forms the upper rear end of the motor room 1 so that at least a part of the electric unit 30 overlaps in a top view and projects rearward. It is arranged from the upper rear side of the electric unit 30. [Selection] Figure 2

Description

  The present invention relates to a front unit mounting structure for an electric vehicle.

  For example, an electric vehicle, a hybrid vehicle, and a fuel cell vehicle are known as an electric vehicle provided with a traveling electric motor (hereinafter simply referred to as a motor) in a motor room formed in the front part of the vehicle body. For example, Patent Document 1 discloses an electric vehicle in which a front unit including a traveling motor and an electric unit for driving a motor is mounted in a motor room provided at the front of the vehicle. Generally, an electric unit of an electric vehicle includes a plurality of inverters that convert a DC voltage from a high voltage battery into an AC, a charger for a high voltage battery, a DC-DC converter, a junction box to which a high voltage harness is connected, and the like. Equipment is included.

  In order to prevent overheating, high-voltage electrical components such as an electric unit and a motor may be provided with a cooling device for circulating cooling water through them. The cooling device is provided with a degas tank that separates the gas in the cooling water. The degas tank needs to be arranged at a higher position in the cooling path in order to efficiently separate the gas that tends to accumulate upward.

JP 2017-30424 A

  In the motor room, by stacking a plurality of high-voltage electrical components vertically, a high-voltage harness that connects them can be compactly routed. However, in this case, high-voltage electrical components are stacked highly in the vertical direction. On the other hand, the height of the motor room is restricted by the hood. For this reason, it is not easy to lay out the degas tank at a position higher than a plurality of high-voltage electrical components stacked above and below and lower than the hood.

  The present invention relates to an electric vehicle including a plurality of electrical components in a motor room provided in a front portion of the vehicle, and efficiently stacks a plurality of electrical components on the top and bottom and efficiently gas from cooling water for cooling the electrical components. It is an object of the present invention to provide a front unit structure that is separable.

  In order to solve the above problems, the present invention is configured as follows.

  The invention according to claim 1 of the present application is mounted on a cross member extending in the vehicle width direction and on the cross member in a motor room formed below a bonnet of a front lowering provided in a front portion of the vehicle. A unit mounting structure for a vehicle body front portion of an electric vehicle, comprising: an electric unit; and a traveling motor attached to a lower side of the cross member and fed by the electric unit, wherein the electric unit and the motor A cooling path through which cooling water circulates and a degas tank provided in the cooling path for separating gas from the cooling water, the degas tank being a cooling path provided in the electric unit Is disposed at a position overlapping with the cowl top panel constituting the upper end of the rear end of the motor room in the vertical direction, and is at least one in a top view. So they rear end with overlaps with the electric unit is projected rearward from said electric unit, characterized in that it is arranged from the upper rear side of the electric unit.

  The invention described in claim 2 is characterized in that the degas tank is supported by the electric unit via a bracket.

  According to a third aspect of the present invention, the bracket is a guard body that protects a harness connected to the electric unit.

  According to a fourth aspect of the present invention, the degas tank includes a support portion supported by the bracket, and the support portion is configured as a notch that penetrates in the vertical direction and opens rearward. The degas tank is fastened and fixed to the bracket by a fastening member that vertically penetrates the notch.

  According to a fifth aspect of the present invention, the cooling path has a tank inlet pipe connected to the inlet of the degas tank and a tank outlet pipe connected to the outlet of the degas tank. Features.

  The invention described in claim 6 is characterized in that the tank inlet pipe and the tank outlet pipe are located in a pair in the vehicle width direction with the degas tank interposed therebetween.

  The invention described in claim 7 is characterized in that the tank inlet pipe and the tank outlet pipe are flexible annular members.

  According to an eighth aspect of the present invention, the electrical unit includes a plurality of electrical components, at least one of which is an uncooled electrical component that is not cooled, and the plurality of electrical components include the uncooled electrical component. The degas tank is stacked in two rows in the vehicle width direction so as to be positioned at the uppermost stage, and the degas tank is located above the row where the uncooled electrical components are not stacked, and the height direction of the uncooled electrical components It arrange | positions so that it may overlap.

  According to the invention of each claim of the present application, the following effects can be obtained by the above configuration.

  First, according to the first aspect of the present invention, the motor room is formed so as to expand upward and rearward by the front lowering bonnet, and therefore, the degas tank is disposed from the upper rear side of the electric unit. Easy to secure space for. Utilizing this space, the degas tank can be easily arranged at a position as high as possible in the motor room while suppressing interference with the cowl top and the bonnet, and gas-liquid separation in the cooling path can be easily performed.

  Furthermore, since the degas tank is arranged so that at least a part of the degas tank overlaps with the electric unit when viewed from above, even if the degas tank falls off at the time of a front collision or the like, the degas tank is easily supported on the electric unit. Damage is suppressed. As a result, it is easy to suppress the leakage of the cooling water from the degas tank at the time of the front collision.

  According to the invention described in claim 2, since the degas tank is configured so as not to be relatively displaceable with the electric unit, the degas tank is displaced along with the displacement of the electric unit at the time of the front collision. Thereby, a contact with an electric unit and a degas tank is suppressed at the time of a front collision. As a result, the degas tank can be protected from damage due to contact with the electric unit.

  According to the invention described in claim 3, the degas tank can be supported using the guard body that protects the harness connected to the electric unit. Thereby, since it is not necessary to provide the exclusive member for supporting a degas tank, the increase in a number of parts is suppressed.

  According to the fourth aspect of the present invention, for example, even if the degas tank moves rearward together with the electric unit at the time of a front collision and comes into contact with a vehicle body part (for example, a cowl top) located behind this, the fastening member Is easily detached rearward from a notch that opens rearward. As a result, it is easy to suppress the degas tank from strong contact with the vehicle body parts, and damage to the degas tank can be prevented.

  According to the invention of claim 5, for example, even if the degas tank is dropped from the support by the bracket at the time of a front collision, the degas tank is damaged because it is supported by the pair of tank inlet pipe and tank outlet pipe. It is easy to suppress leakage of cooling water from the degas tank.

  According to the sixth aspect of the present invention, for example, at the time of a front collision, the tank inlet pipe and the tank outlet pipe are not easily sandwiched between the degas tank and the cowl top or the electric unit. Thereby, for example, at the time of a front collision, damage to the tank inlet pipe and the outlet pipe is easily suppressed, and the degas tank is more suitably supported.

  Further, according to the seventh aspect of the present invention, for example, even when the degas tank is dropped from the support by the bracket at the time of a front collision, the degas tank is elastically supported by the pair of tank inlet pipe and tank outlet pipe. It is easy to suppress leakage of cooling water from the degas tank by suppressing damage to the gas tank.

  According to the eighth aspect of the present invention, since the electric units are stacked in the height direction in a compact manner, it is easy to perform gas-liquid separation in the cooling path while suppressing the height position of the degas tank. Therefore, the front unit mounting structure can be configured compactly in the height direction.

  That is, according to the front unit mounting structure for an electric vehicle according to the present invention, in the electric vehicle provided with a plurality of electrical components in the motor room provided in the front portion of the vehicle, the plurality of electrical components are stacked one above the other. The gas can be efficiently separated from the cooling water for cooling the electrical components.

The perspective view which shows the front part unit mounting structure of the electric vehicle which concerns on one Embodiment of this invention. The top view of FIG. The rear perspective view of FIG. The left view of FIG. The right view of FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In addition, the following description is only illustrations essentially and does not intend restrict | limiting this invention, its application thing, or its use. Further, the drawings are schematic, and the ratio of each distance is different from the actual one.

  An electric vehicle according to an embodiment of the present invention is an electric motor for traveling that is fed from a high-voltage battery disposed under the floor of a passenger compartment through an electric unit in a motor room formed at the front of the vehicle ( Hereinafter, the electric vehicle is configured to be able to run using a motor as a drive source.

  FIG. 1 is a perspective view showing a front unit mounting structure of an electric vehicle according to an embodiment of the present invention. 2 is a top view of the motor room 1, FIG. 3 is a rear perspective view of the front unit mounting structure, and FIGS. 4 and 5 are a right side view and a left side view of the front unit mounting structure, respectively. In each figure, exterior parts such as a bonnet, a fender, and a bumper are omitted.

(overall structure)
As shown in FIG. 1, the motor room 1 is set as a space partitioned on the front side by a dash panel 2 extending in the vertical direction. A cowl top panel 3 extending in the vehicle width direction is provided at the upper end of the dash panel 2, and the cowl top panel 3 constitutes the rear end upper portion of the motor room 1. As shown in FIGS. 2 and 4, the lower end of the dash panel 2 has a tunnel portion 13 extending rearward at the center in the vehicle width direction and formed in a convex shape above the passenger compartment floor. Is connected.

  As shown in FIGS. 4 and 5, the motor room 1 is formed as a space below the bonnet 12 that is inclined downward and extends forward.

  As shown in FIG. 1, a pair of left and right side frames 4 extend forward from the dash panel 2 on both sides of the motor room 1 in the vehicle width direction. The side frame 4 is formed in a rectangular closed cross section. The front end portions of the pair of left and right side frames 4 are respectively connected to both side portions of a bumper rain 6 extending in the vehicle width direction via a crash can 5 extending in the front-rear direction.

  Mount brackets 7 are bolted to the upper surfaces of the pair of left and right side frames 4, respectively. The mount bracket 7 extends from the upper surface of the side frame 4 to the inside in the vehicle width direction. Both side portions of the cross member 8 extending in the vehicle width direction are attached to the lower surfaces of the pair of left and right mounting brackets 7. Therefore, the cross member 8 is bridged between the pair of left and right side frames 4 via the mount bracket 7 in the vehicle width direction.

  An electric unit 30 is attached to the upper side of the cross member 8, and a motor unit 20 fed from the electric unit 30 is attached to the lower side of the cross member 8. In this specification, the electric unit 30, the motor unit 20, and related components (cooling device, harness, etc.) disposed in the motor room 1 are referred to as a front unit.

  The motor unit 20 is suspended from the cross member 8 via a pair of left and right suspension brackets 9 and 10 (see also FIG. 3). The motor unit 20 includes a vehicle driving three-phase AC motor 21 (hereinafter referred to as a motor 21) located on the right side of the vehicle and a gear box 22 connected to the left side of the vehicle. The motor 21 is arranged with an output shaft (not shown) directed in the vehicle width direction.

  As shown in FIG. 3, the gear box 22 is connected to the output shaft of the motor 21 so as to be able to transmit power, a reduction mechanism that reduces the driving force input from the motor 21 at a predetermined reduction ratio, A differential mechanism that distributes torque to the driving wheels, and outputs driving force from the rear output unit 23. A pair of left and right drive shafts (not shown) are assembled to the output portion 23 of the gear box 22, and a pair of left and right front wheels (not shown) are rotationally driven via the drive shaft.

  The electrical unit 30 includes a plurality of high-voltage electrical components, specifically, an inverter 40, a junction box 50, an in-vehicle charger 31, and a DC-C converter 35. The inverter 40 is located on the vehicle left side of the cross member 8, and a junction box 50 is stacked on the upper side. The in-vehicle charger 31 is located on the right side of the cross member 8 in the vehicle, and a DC-DC converter 35 is stacked on the upper side.

  Therefore, the electrical unit 30 is configured to be compact in the front-rear and up-down directions by adopting a structure in which a plurality of electrical components are divided into two rows in the vehicle width direction and stacked in two stages.

  Here, in this specification, the high-voltage electrical component is applied by a voltage (for example, 100 V or more) exceeding the rated voltage of general vehicle-mounted electrical components (12 V for passenger cars, 24 V for commercial vehicles such as trucks and buses). Means an electrical component.

  The inverter 40 and the in-vehicle charger 31 stacked in the lower stage have substantially the same vertical dimension, but the DC-DC converter 35 stacked in the upper stage has a smaller vertical dimension than the junction box 50. That is, the left electric unit 30L including the inverter 40 and the junction box 50 stacked on the left side of the vehicle is higher in the vertical direction than the right electric unit 30R including the on-vehicle charger 31 and the DC-DC converter 35 stacked on the right side of the vehicle. .

  The inverter 40 converts the high voltage (for example, 300V) DC power from the main battery 11 (FIG. 2) disposed under the floor of the passenger compartment into three-phase AC power and supplies it to the motor 21. It is an electrical component and has an inverter circuit.

  The junction box 50 is a so-called junction box for protecting terminals and terminals used when connecting, branching, and relaying harnesses, and has a relay circuit. As shown in FIG. 2 and FIG. 3, in the present embodiment, the junction box 50 is connected to the main battery 11 via two battery harnesses 70. The junction box 50 is connected to the motor 21 via three motor harnesses 75 corresponding to three-phase AC power. The inverter 40 and the junction box 50 are connected to each other through bus bars (not shown) that are vertically inserted.

  As shown in FIG. 5, a guard body 65 having a reverse L-shape in a side view is fixed to the rear portion of the junction box 50 with a fastening bolt. The guard body 65 includes a guard body horizontal plane portion 66 extending rearward from the upper surface of the junction box 50, a guard body rear surface portion 67 extending downward from the rear end portion, and a guard body side flange extending downward or forward from both side portions thereof. 68.

  The guard body rear surface portion 67 is located between the upper part of each of the battery harness 70 and the motor harness 75 and the cowl top panel 3, and the rear side of the connection portion of the harnesses 70, 75 to the junction box 50. Opposite from.

  As shown in FIG. 3, the in-vehicle charger 31 has a charging circuit and charges the main battery 11 with power from an external power source (for example, 100 V or 200 V) connected via a charging cable. Thus, the in-vehicle charger 31 and the main battery 11 are connected by a power cable (not shown). The DC-DC converter 35 is a converter that converts a high voltage into a low voltage (for example, 12 V) for driving an in-vehicle device.

  Here, in order to prevent overheating of the motor unit 20 including the high-voltage electrical components and the electric unit 30 during running and charging, a cooling device is further provided in the motor room 1. Specifically, the motor 21 of the motor unit 20, the inverter 40 of the electric unit 30, the in-vehicle charger 31, and the DC-DC converter 35 are cooled by a cooling device during traveling and charging. On the other hand, the junction box 50 is configured as an uncooled electrical component that is not cooled.

(Cooling system)
As shown in FIG. 3, the cooling device includes a radiator 91 for dissipating heat disposed on the front side of the motor room 1, an electric water pump 92 for circulating cooling water disposed behind the cross member 8, A degas tank 93 that separates gas from water, and a cooling path through which the cooling water circulates are connected between these cooling devices and the motor unit 20 and the electric unit 30.

  The cooling path includes a motor cooling pipe 101, a radiator inlet pipe 102 (see FIG. 2), a charger cooling pipe 103, an inverter cooling pipe 104, a DC-DC converter cooling pipe 105, a degas tank inlet pipe 106, And a water pump inlet pipe 107. Each of the cooling pipes and the inlet pipes 101 to 107 is configured by appropriately combining a rubber hose and a metal or resin pipe. The cooling path has a water jacket (not shown) formed in each of the motor 21, the in-vehicle charger 31, the inverter 40, and the DC-DC converter 35.

  Referring to FIGS. 1 and 3, motor cooling pipe 101 extends rearward of motor unit 20 to the right side of the vehicle from an upstream end connected to a discharge port provided at a rear side of electric water pump 92. At the same time, it makes a U-turn and extends to the left side of the vehicle. Further, the motor cooling pipe 101 extends forward on the vehicle left side of the motor unit 20 and extends forward of the motor unit 20 toward the vehicle right side, and a downstream end is provided at a cooling water inlet provided at a front portion of the motor 21. It is connected.

  Referring to FIGS. 1 and 4, the radiator inlet pipe 102 extends from the upstream end connected to the cooling water outlet provided at the front of the motor 21 to the right side of the vehicle and forward. The other end on the downstream side is connected to a radiator inlet provided below the right end of the radiator 91.

  1, 3, and 4, the charger cooling pipe 103 is connected to the upper right end of the right electrical unit 20 </ b> R from the upstream end connected to the radiator outlet provided at the upper right end of the radiator 91. The rear end of the right electric unit 20 </ b> R extends downward, and the downstream end is connected to a cooling water inlet provided on the rear end surface of the in-vehicle charger 31.

  Referring to FIGS. 1 and 3, the inverter cooling pipe 104 is connected to a DC-DC converter 35 and a junction box from an upstream end connected to a cooling water outlet provided on the rear end surface of the in-vehicle charger 31. 50 and the junction box 50 is extended to the left side of the vehicle, and the downstream end is connected to a cooling water inlet provided on the left end surface of the inverter 40.

  Referring to FIGS. 1 and 3, DC-DC converter cooling pipe 105 is disposed in front of junction box 50 from an upstream end connected to a cooling water outlet provided on the left end surface of inverter 40. It extends to the right side, and its downstream end is connected to a cooling water inlet provided at the front of the DC-DC converter 35.

  Referring to FIGS. 1 and 2, the degas tank inlet pipe 106 is connected to the cooling water outlet provided at the front part of the DC-DC converter 35 from the upstream end of the charger cooling pipe 103. The upper end extends rearward and extends to the left side of the vehicle, and the downstream end is connected to a tank inlet provided at the lower front end of the right end face of the degas tank 93.

  Referring to FIG. 3, the water pump inlet pipe (degas tank outlet pipe) 107 is connected to the left electric unit 20 </ b> L from the upstream end connected to the tank outlet provided at the lower rear end of the left end face of the degas tank 93. The rear side extends to the left side of the vehicle, extends downward in the vicinity of the left end of the left electric unit 20L, and the downstream end is connected to a pump inlet provided at the top of the electric water pump 92.

  Further, the degas tank inlet pipe 106 and the water pump inlet pipe 107 are constituted by a flexible annular member, for example, a rubber hose. Therefore, a pair of degas tank inlet pipe 106 and water pump inlet pipe 107 are connected to the degas tank 93 in the vehicle width direction with the degas tank 93 interposed therebetween.

  The cooling water inlet / outlet formed in the DC-DC converter 35 is provided at a position higher in the vertical direction than the cooling water inlet / outlet formed in each of the in-vehicle charger 31 and the inverter 40.

  As described above, the motor 21, the on-vehicle charger 31, the inverter 40, and the DC-DC converter 35 have a water jacket through which cooling water flows. That is, the cooling path includes the electric water pump 92, the motor 21, the radiator 91, the in-vehicle charger 31, the inverter 40, the DC-DC converter 35, and the degas tank 93 together with the water jacket formed therein and the cooling pipe and the inlet pipe 101. To 107 are configured as a path connected in series in this order.

  The degas tank 93 will be described in detail with reference to FIG. The degas tank 93 is disposed above the right electric unit 30R. More specifically, the degas tank 93 has at least a portion overlapping the right electric unit 30R when viewed from above, and the right electric unit 30R so that the rear end protrudes rearward from the right electric unit 30R. It is arranged from the upper rear side.

  Further, the degas tank 93 is disposed at a position higher in the vertical direction than the cooling water inlet / outlet formed in the DC-DC converter 35.

  As shown in FIG. 4, the bonnet 12 extends obliquely downward toward the front. That is, the vertical dimension of the motor room 1 defined below the bonnet 12 increases toward the rear. Using this enlarged space, the degas tank 93 is arranged from the upper rear side of the electric unit 30R. Specifically, the degas tank 93 is stacked above the left electric unit 30L, and overlaps with the junction box 50 not included in the cooling path in the height direction, and the cowl top panel 3 is also in the height direction. It is arranged to overlap.

  Next, fixing of the degas tank 93 will be described. As shown in FIG. 2, the degas tank 93 has a flange portion 94 extending substantially horizontally on the left side of the vehicle at the left end portion. The flange portion 94 has a pair of front and rear cutout portions 95 (support portions) that penetrates in the vertical direction and opens rearward. More specifically, the notch 95 extends in a direction inclined to the left side of the vehicle toward the rear.

  The degas tank 93 is supported by a guard body 65 (bracket) via a flange portion 94. Specifically, the degas tank 93 has a shaft portion of a stud bolt provided in the guard body horizontal plane portion 66 inserted through a pair of front and rear cutout portions 95 from below and a fastening nut 96 attached to the male screw of the stud bolt. It is fixed by fastening to the upper surface portion of 65. In other words, the degas tank 93 is fastened to the guard body 65 by the seating surface of the fastening nut 96 pressing the peripheral edge of the notch 95 toward the guard body 65.

  According to the front unit mounting structure of the electric vehicle according to the above embodiment, the following effects are obtained.

(1) Since the motor room 1 is formed so as to expand upward and rearward by the front-lowering bonnet 12, a space for disposing the degas tank 93 is secured from the upper rear side of the electric unit 30. Cheap. Utilizing this space, the degas tank 93 can be easily placed as high as possible in the motor room 1 while suppressing interference with the cowl top panel 3 and the bonnet 12, and gas-liquid separation in the cooling path is performed. It's easy to do.

(2) Furthermore, since the degas tank 93 is arranged so that at least a part of the degas tank 93 overlaps with the electric unit 30 when viewed from above, the degas tank 93 comes into contact with the vehicle body parts located rearward at the time of a collision or the like. Even if it falls off, it is easily supported by the upper part of the electric unit 30, and damage to the degas tank 93 is suppressed. As a result, it is easy to suppress leakage of the cooling water from the degas tank 93 at the time of the front collision.

(3) Since the degas tank 93 is configured so as not to be relatively displaceable with the electric unit 30, the degas tank 93 is also displaced along with the displacement of the electric unit 30 at the time of a front collision. Thereby, the contact with the electric unit 30 and the degas tank 93 is suppressed at the time of a front collision. As a result, the degas tank 93 can be protected from damage due to contact with the electric unit 30.

(4) The degas tank 93 can be supported by using the guard body 65 that protects the battery harness 70 and the motor harness 75 connected to the electric unit 30. Thereby, since it is not necessary to provide a dedicated member for supporting the degas tank 93, an increase in the number of parts is suppressed.

(5) For example, even when the degas tank 93 moves rearward together with the electric unit 30 at the time of a front collision and comes into contact with a vehicle body part (for example, the cowl top panel 3) located behind the degas tank 93, The stud bolt to be fastened to is easily detached rearward from a notch portion 95 that is formed in the flange portion 94 and opens rearward. As a result, the degas tank 93 can be easily suppressed from strong contact with the vehicle body parts, and damage to the degas tank 93 can be prevented.

(6) Since the pair of degas tank inlet pipe 106 and the water pump inlet pipe 107 are connected to the degas tank 93, even if the degas tank 93 falls off the support by the guard body 65 at the time of a front collision, for example. Since the degas tank 93 is supported by the pair of degas tank inlet pipes 106 and the water pump inlet pipe 107, damage to the degas tank 93 can be suppressed and leakage of the cooling water from the degas tank 93 can be easily suppressed.

(7) Since the degas tank inlet pipe 106 and the water pump inlet pipe 107 are located in a pair in the vehicle width direction with the degas tank 93 in between, the degas tank 93 and the cowl top panel 3 or the electric It is difficult to be sandwiched between the front and rear direction with the unit 30. Thereby, for example, at the time of a front collision, damage to the degas tank inlet pipe 106 and the water pump inlet pipe 107 is easily suppressed, and the degas tank 93 is more suitably supported.

(8) Since the degas tank inlet pipe 106 and the water pump inlet pipe 107 are flexible annular members, even if the degas tank 93 drops off from the support by the guard body 65 at the time of a front collision, for example, Since it is elastically supported by the degas tank inlet pipe 106 and the water pump inlet pipe 107, damage to the degas tank 93 is suppressed, and leakage of cooling water from the degas tank 93 is easily suppressed.

(9) The electrical unit 30 includes a plurality of electrical components divided into two rows in the vehicle width direction and stacked in two stages, and a junction box 50 that does not require cooling is stacked on the upper side. A degas tank 93 is disposed above the right electrical unit 30R that is not stacked so as to overlap the junction box 50 in the vertical direction. Thereby, since the electric unit 30 is laminated | stacked compactly in a height direction, it is easy to implement the gas-liquid separation in a cooling path | route, suppressing the height position of the degas tank 93. FIG. Therefore, the front unit mounting structure can be configured compactly in the height direction.

  Although the said embodiment demonstrated the electric vehicle as an example, it is not restricted to this, What is necessary is just an electric vehicle which makes an electric motor a drive source, for example, it can apply suitably also to a hybrid vehicle and a fuel cell vehicle.

  As described above, according to the front unit mounting structure for an electric vehicle according to the present invention, in the electric vehicle provided with a plurality of electrical components in the motor room provided in the front portion of the vehicle, the plurality of electrical components are stacked one above the other. However, since the gas can be efficiently separated from the cooling water for cooling the electrical components, there is a possibility that it can be suitably used in the technical field of manufacturing electric vehicles.

DESCRIPTION OF SYMBOLS 1 Motor room 2 Dash panel 3 Cowl top panel 8 Cross member 11 Main battery 12 Bonnet 13 Tunnel part 20 Motor unit 21 Motor 30 Electric unit 31 Car-mounted charger 35 DC-DC converter 40 Inverter 50 Junction box 70 Battery harness 80 Motor harness 91 Radiator 92 Electric water pump 93 Degas tank 94 Flange portion 95 Notch portion 96 Fastening nut 101 Motor cooling pipe 102 Radiator inlet pipe 103 Charger cooling pipe 104 Inverter cooling pipe 105 DC-DC converter cooling pipe 106 Degas tank inlet pipe 107 Water pump Inlet piping

Claims (8)

A motor room formed below a bonnet of a front lowering provided at the front of the vehicle, a cross member extending in the vehicle width direction, an electric unit mounted on the cross member, and a lower side of the cross member A unit mounting structure at the front of a vehicle body of an electric vehicle, comprising a traveling motor attached and powered by the electric unit,
A cooling path for connecting the electric unit and the motor and circulating cooling water;
A degas tank provided in the cooling path and separating gas from the cooling water,
The degas tank is
It is arranged at a position that is higher than the outlet of the cooling path provided in the electric unit and overlaps with the cowl top panel that constitutes the upper rear end of the motor room in the vertical direction,
The front of the electric vehicle, which is disposed from the upper rear side of the electric unit so that at least a part of the electric unit overlaps with the electric unit in a top view and a rear end portion projects rearward of the electric unit. Unit mounting structure. The degas tank is supported by the electric unit via a bracket,
The front unit mounting structure for an electric vehicle according to claim 1. The bracket is a guard body that protects a harness connected to the electrical unit.
The front unit mounting structure for an electric vehicle according to claim 2. The degas tank has a support portion supported by the bracket,
The support portion is configured as a cutout portion that penetrates in the vertical direction and opens toward the rear,
The degas tank is fastened and fixed to the bracket by a fastening member that vertically penetrates the notch,
The front unit mounting structure for an electric vehicle according to claim 2 or 3. The cooling path is
A tank inlet pipe connected to the inlet of the degas tank;
A tank outlet pipe connected to an outlet of the degas tank,
The front unit mounting structure for an electric vehicle according to any one of claims 2 to 4. The tank inlet pipe and the tank outlet pipe are located in a pair in the vehicle width direction across the degas tank,
The front unit mounting structure for an electric vehicle according to claim 5. The tank inlet pipe and the tank outlet pipe are flexible annular members,
The front unit mounting structure for an electric vehicle according to claim 5 or 6. The electrical unit includes a plurality of electrical components, at least one of which is an uncooled electrical component that is not cooled,
The plurality of electrical components are stacked in two rows in the vehicle width direction so that the uncooled electrical components are positioned at the uppermost stage.
The degas tank is disposed above the row where the non-cooled electrical components are not stacked, and overlaps the non-cooled electrical components in the height direction.
The front unit mounting structure for an electric vehicle according to any one of claims 1 to 7.

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