JP5182241B2 - Mounting method of cooling unit for electric device for vehicle and cooling unit for electric device for vehicle - Google Patents

Description

  The present invention relates to a method for mounting a cooling unit of an in-vehicle electric device on a vehicle and a structure of the cooling unit of the in-vehicle electric device.

  In an electric vehicle such as a hybrid vehicle that drives a vehicle by combining an engine and a motor or an electric vehicle that drives a vehicle by a motor, the vehicle is equipped with a secondary battery that can be charged and discharged, and the motor or motor is driven by the output of the secondary battery. A generator is driven. The secondary battery has a structure having a voltage lower than the driving power for the motor or motor generator, and drives the vehicle by boosting the low voltage to a high voltage for driving the motor or motor generator. In addition, the high-voltage power generated by the motor generator is stepped down to charge the secondary battery. In this way, a DC-DC converter is used as a device that converts the voltage of the secondary battery into a driving voltage for the motor or motor generator, or conversely converts the voltage of the electric power generated by the motor generator for charging the secondary battery. Is used. Since the secondary battery and the DC-DC converter generate heat during operation, it is necessary to cool the secondary battery and the DC-DC converter while these devices are operating.

  On the other hand, since the secondary battery and the DC-DC converter are electrical devices, it is necessary that the cooling air does not contain water droplets. There are many ways to circulate. In this case, in order to cool the secondary battery and the DC-DC converter and to prevent the passenger from feeling uncomfortable, the cooling air after cooling the secondary battery and the DC-DC converter enters the passenger compartment. There has been proposed a method in which the discharge ports of the discharge duct are distributed and arranged at a plurality of positions (see, for example, Patent Document 1).

  Patent Document 2 discloses a duct that allows cooling air to flow in a well-balanced manner with respect to the heat generating portion of the DC-DC converter when the DC-DC converter is cooled using air after cooling the secondary battery. The shape has been proposed.

JP 2007-223523 A JP 2007-276668 A

  By the way, when the duct for flowing cooling air of the secondary battery or the DC-DC converter is enlarged, the pressure loss is reduced and the cooling characteristics are improved. However, as described in Patent Documents 1 and 2, a limited space is provided. If it is going to arrange | position a duct in this, it is necessary to make the shape of a duct the complicated thing containing several bending parts, or to make the external dimension of a duct small in part from the relationship of arrangement | positioning. As described above, when the bent part of the duct is increased or the cross-sectional area of the flow path is reduced, the pressure loss is increased and the cooling efficiency is lowered.

  In addition, as described in Patent Documents 1 and 2, the secondary battery and the DC-DC converter are arranged at the rear part of the vehicle other than the case where they are arranged at a position where the assembly space can be taken like the center console in the vehicle interior. Sometimes it is done. In this case, since there is a tire house for the rear wheel, the arrangement space for the secondary battery, the DC-DC converter, the cooling duct, etc. is further limited, and there is a problem that the pressure loss of the duct increases. .

  Then, an object of this invention is to suppress the pressure loss of the cooling duct arrange | positioned in the limited space.

  The method for mounting a cooling unit for an electric device for a vehicle according to the present invention includes a step of arranging an electric device for a vehicle in a housing, an end of the first duct connected to the electric device, and the other end of the first duct A step of attaching the first duct to the housing so as to extend linearly along a side surface of the housing in a direction along the upper surface or the lower surface of the housing to form a housing assembly; And a cooling fan, one end of which is connected to the cooling fan, and the other end of the first duct is substantially the same as the inner shape of the other end of the first duct and extends linearly. A step of integrally attaching the second duct to the bracket to form a cooling fan assembly; a second end of the first duct of the housing assembly mounted on the vehicle; and a second end of the second duct of the cooling fan assembly. Are placed on the same axis and the cooling fan assembly is The bristle is slid toward the first duct in the direction along the side surface of the housing, and the other end of the second duct is fitted into the other end of the first duct, and the first duct and the second duct And a step of connecting the two.

  In the method for mounting the cooling unit of the present invention, the housing houses a secondary battery for driving the vehicle, the vehicle includes a pair of tire houses in the vehicle width direction, and the housing assembly is mounted on the vehicle. The step of mounting the housing assembly between the tire houses so that the other end of the first duct extends in the front-rear direction of the vehicle between the side surface of the housing and the tire house, and connecting the second duct is a cooling process. It is also preferable to slide the cooling fan assembly in the front-rear direction of the vehicle after the other end of the second duct of the fan assembly is dropped between the side surface of the housing and the tire house.

  A cooling unit for a vehicle electrical device according to the present invention is a cooling unit attached to a housing together with the vehicle electrical device, the cooling fan attached to the housing, one end connected to the electrical device, and the other end to the housing. A first duct extending linearly along the upper or lower surface of the housing along the side surface of the body, one end connected to the cooling fan, and the other end linearly coaxial with the other end of the first duct And a second duct that extends in a shape and is fitted to the other end of the first duct.

  In the cooling unit of the present invention, the housing houses the secondary battery for driving the vehicle, is mounted between the pair of tire houses in the width direction of the vehicle, and includes the other end of the first duct and the second duct. The connecting portion with the other end is also preferably disposed between the side surface of the housing and the tire house.

  The present invention has an effect that the pressure loss of the cooling duct arranged in a limited space can be suppressed.

It is explanatory drawing which shows the vehicle carrying the cooling unit of the electrical equipment for vehicles in embodiment of this invention. It is a partial top view of the vehicle by which the cooling unit of the electric equipment for vehicles in the embodiment of the present invention is carried. It is a perspective view of the casing of the secondary battery with which the electric equipment for vehicles and the cooling unit in the embodiment of the present invention were attached. It is explanatory drawing which shows the casing assembly of the electric equipment for vehicles and cooling unit in embodiment of this invention. It is explanatory drawing which shows the cooling fan assembly of the electric equipment for vehicles and cooling unit in embodiment of this invention. It is explanatory drawing which shows the process of assembling a cooling fan assembly to the casing assembly of the electrical equipment for vehicles and the cooling unit in the embodiment of the present invention. It is a perspective view of the casing of the secondary battery with which the electric equipment for vehicles and the cooling unit in the prior art were attached.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the cooling unit 50 of the present embodiment is attached to the side surface of the power storage device 20 mounted in the luggage space 13 disposed in the rear portion of the vehicle 10. And after cooling the DC-DC converter which is an electric equipment attached to the electrical storage apparatus 20 with the air inhaled from the luggage space 13, it is comprised so that the air may be discharged | emitted out of a vehicle.

  As shown in FIG. 2, the casing 21 of the power storage device 20 in which the secondary battery 22 for driving the vehicle is housed is a substantially rectangular parallelepiped, and is mounted between the tire houses 14 of the rear wheels 15 of the vehicle 10. . The cooling unit 50 includes a cooling fan 56, a first duct 51 connected to the air outlet 25 of the DC-DC converter 23, a second duct 55 connecting the first duct 51 and the cooling fan 56, A third duct 57 is connected to the cooling fan 56 and guides the air to the outside of the vehicle. The second duct 55, the cooling fan 56, and the third duct 57 are integrally attached to a common bracket 58, and constitute a cooling fan assembly 59. The cooling fan assembly 59 is constituted by bolts 32 and nuts 31. It is attached to the attachment lug 30 of the casing 21. The distance in the width direction of the vehicle 10 between the casing 21 and the tire house 14 is D.

  When the cooling fan 56 is driven, the cooling air is sucked into the DC-DC converter 23 from the air inlet 24 of the DC-DC converter 23, and after cooling the switching elements constituting the DC-DC converter 23, the air outlet 25. To the first duct 51. The cooling air that has flowed out into the first duct 51 is sucked into the cooling fan 56 from the first duct 51 through the second duct 55. The air pressurized by the cooling fan 56 flows out into the third duct 57 and is discharged out of the vehicle from the air outlet end 57b of the third duct.

  As shown in FIG. 3, the DC-DC converter 23 has a rectangular parallelepiped shape, an air inlet 24 is provided on one side surface, an air outlet 25 is provided on the other side surface, and four flanges provided on the lower side. Each hole 26 is fitted into a fixing bolt 28 provided on the mounting surface 27 of the casing 21, and is fixed to the casing 21 by a nut 29 screwed into the fixing bolt 28. The first duct 51 is a rectangular cross-section duct that is connected to the air outlet 25 of the DC-DC converter 23 and bent downward along the side surface of the casing 21 from the air inlet end 51a that is one end, and then the side surface of the casing 21. 1 is bent in an L shape toward the rear of the vehicle 10 shown in FIG. 1 and extends linearly along the upper or lower surface of the casing 21 to the air outlet end 51b which is the other end. In the vicinity of the air outlet end 51b of the first duct 51, the length of each side is longer than that of the upstream duct, and a connection portion 51c into which the air inlet end 55a of the second duct 55 can be fitted. ing.

  The second duct 55 is a rectangular duct having the same size as the horizontal portion of the first duct 51, and the air inlet end 55 a, which is the other end, is fitted into the connection portion 51 c of the first duct 51 and the second duct 55. The first duct 51 is connected to the first duct 51 coaxially with the air outlet end 51 b of the duct 51. The second duct 55 is bent in a mountain shape from the air inlet end 55a toward the air outlet end 55b. The bending angle is an angle along the shape of the tire house 14, as shown in FIG. The air outlet end 55 b that is one end is connected to the casing of the cooling fan 56.

  As shown in FIGS. 2 and 3, the common bracket 58 to which the second duct 55, the cooling fan 56, and the third duct 57 are attached has a groove shape and is provided in the casing 21. The upper upper flange 65 and the lower lower flange 67 attached to the attachment lug 30 have a trapezoidal shape, and the surface of the web 66 to which the cooling fan 56 and the second duct 55 are attached is the side of the casing 21. It is comprised so that it may incline with respect. As shown in FIG. 2, the inclination angle is along the shape of the adjacent tire house 14. The mounting legs 61 and 62 of the second duct 55 and the cooling fan 56 are attached to the surface of the web 66 of the bracket 58 by bolts 63. The third duct 57 is attached to the cooling fan 56.

  A method of mounting the cooling unit 50 of the DC-DC converter 23 configured as described above on the vehicle will be described. As shown in FIG. 4, a casing 21 in which a secondary battery 22 is housed is prepared. The casing 21 has a substantially rectangular parallelepiped shape. The secondary battery 22 is mounted on the lower part of the casing 21, and an attachment surface 27 to which the DC-DC converter 23 is attached is provided on the upper part. The attachment surface 27 is a surface that is one step lower than the upper surface of the casing 21, and a fixing bolt 28 for fixing the DC-DC converter 23 and the first duct 51 is attached to the surface. Further, an inverter or the like may be mounted on the casing 21.

  Next, the position of the hole of the flange 26 of the DC-DC converter 23 is aligned with the position of the fixing bolt 28, and the DC-DC converter 23 is set on the mounting surface 27 as shown by the arrow in FIG. Attach the two nuts 29 on the back side. Next, as shown by the arrows in FIG. 4, the air inlet end 51 a of the first duct 51 is fitted outside the air outlet 25 of the DC-DC converter, and the air outlet 25 of the DC-DC converter 23 and the first duct are inserted. 51 is connected to the air inlet end 51a. Further, as indicated by the arrows shown in FIG. 4, the positions of the holes of the attachment arm 54 provided on the air inlet end 51 a side of the first duct 51 are set on the two front sides of the attachment surface 27 of the casing 21 shown in FIG. 4. The arm 54 is superposed on the flange 26 of the DC-DC converter 23 in accordance with the bolts. Then, the nut 29 is attached from above the arm 54 to fix the DC-DC converter 23 and to fix the first duct 51 to the casing 21. When the DC-DC converter 23 and the first duct 51 are attached to the casing 21, a casing assembly 40 is obtained.

  Next, the casing assembly 40 is set between the tire houses 14 at the rear of the vehicle 10 as shown in FIGS. At this time, set the casing 21 with the DC-DC converter 23 attached to the vehicle compartment 11 of the vehicle 10 and set the first duct 51 so as to enter between the casing 21 and the tire house 14. The casing is fixed to the vehicle 10 with fixing bolts, nuts and the like (not shown).

  As shown in FIG. 5, a cooling fan assembly 59 is separately assembled. First, the third duct 57 is connected to the discharge port provided on the side surface of the cooling fan 56. This may be connected by fitting, or a flange may be provided on the third duct 57 and the cooling fan 56, and the flange may be tightened with a bolt for connection. When the cooling fan 56 and the third duct 57 are connected, the cooling fan 56 is attached to the bracket 58. The cooling fan 56 is attached by aligning the hole of the attachment leg 62 with the screw hole 64 on the surface of the web 66 of the grooved bracket 58 and tightening the bolt 63. Next, the air outlet end 55 b of the second duct 55 is attached to the air suction port of the cooling fan 56. This may be achieved by fitting, or a flange may be provided in the second duct 55 and the cooling fan 56, and the flange may be tightened with a bolt for connection. Then, the holes of the mounting legs 61 of the second duct 55 are aligned with the screw holes 64 of the bracket 58, and the bolts 63 are tightened to fix the second duct 55 to the bracket 58. Although not shown in FIG. 5, when the mounting leg 61 is provided in the third duct 57, it is fixed to the bracket 58 similarly to the second duct 55. In this manner, the cooling fan 56, the second duct 55, and the third duct 57 are fixed to the common bracket 58, and the cooling fan assembly 59 is assembled.

  As shown in FIG. 6, after the assembly of the cooling fan assembly 59 is completed, the cooling fan assembly 59 is attached to the casing 21 and the air outlet end 51b of the first duct 51 and the air inlet end 55a of the second duct 55 are connected. Connecting. First, as shown in FIG. 2, the cooling fan assembly 59 is dropped so that the second duct 55 enters between the casing 21 and the tire house 14, and the bolt fixed to the mounting lug 30 provided in the casing 21. The long hole 68 of the bracket 58 of the cooling fan assembly 59 is passed through 32. Since the attachment lugs 30 are arranged on the upper surface and the lower side of the casing 21, the respective long holes 68 are passed through the respective bolts 32. Then, the upper flange 65 and the lower flange 67 of the bracket 58 are respectively placed on the mounting lug 30 so that the weight of the cooling fan assembly 59 is applied to the casing 21. As described above, when the long holes 68 are passed through the bolts 32 attached to the lugs 30, the air inlet end 55a of the second duct 55 is substantially coaxial with the air outlet end 51b of the first duct 51, and the casing. It becomes a substantially horizontal direction along the side surface of 21.

  Then, the cooling fan assembly 59 is slid horizontally in the direction along the side surface of the casing 21, and the air inlet end 55 a of the second duct 55 is fitted into the connection portion 51 c of the first duct 51. As shown in FIGS. 5 and 6, since the sponge 60 as a cushioning material is attached to the outer surface in the vicinity of the air inlet end 55 a of the second duct 55, the air inlet end 55 a of the second duct 55 is When entering the connection portion 51 c of the first duct 51, air does not leak from the gaps between the ducts 51 and 55.

  When the second duct 55 is connected to the first duct 51, the nut 31 is attached to the bolt 32, and the bracket 58 is fixed to the casing 21.

  Next, the structure and assembling method of the conventional power storage device 20 will be described with reference to FIG. Parts similar to those of the embodiment described with reference to FIG. 1 to FIG. As shown in FIG. 7, in the prior art, the first duct 51 is bent downward along the side surface of the casing 21 from the connection portion of the air outlet 25 of the DC-DC converter 23, and then the casing 21. Along the side surface, the air outlet end 51b is bent in a substantially U shape so as to be vertically upward. On the other hand, the second duct 55 is connected to the cooling fan 56 by being bent in a substantially U shape in the opposite direction to the first duct 51 toward the cooling fan 56 with the air inlet end 55 a vertically downward. When the cooling fan assembly 59 is attached to the casing 21, the cooling fan assembly 59 is dropped from above, the hole of the bracket 58 is aligned with the bolt 32, and the air inlet end 55 a of the second duct 55 is connected to the first duct 55. The connecting portion 51c of the duct 51 is dropped from above and connected to be assembled.

  As described above, in the power storage device 20 of the prior art, the cooling unit 50 drops the cooling fan assembly 59 from above to perform attachment to the casing 21 and connection of the first and second ducts 51 and 55. Therefore, although the assembly is simple, the shapes of the first duct 51 and the second duct 55 are bent so that there is a problem that the pressure loss is large. Further, the connecting portion 51c between the first duct 51 and the second duct 55 needs to secure a space at the front and rear bent portions, and cannot be enlarged in the front-rear direction of the vehicle. Since the distance D to the tire house 14 shown is small, the lengths of the ducts 51 and 55 in the vehicle width direction cannot be increased. For this reason, the flow path in the vicinity of the connecting portion 51c becomes narrow, and there is a problem that the pressure loss increases.

  On the other hand, in the present embodiment described with reference to FIGS. 1 to 6, the first duct 51 and the second duct 55 are less bent and the pressure loss can be reduced. Moreover, in this embodiment, even when the space | interval D of the 1st duct 51, the 2nd duct 55, and the tire house 14 is small, the dimension of the up-down direction of the 1st duct 51 and the 2nd duct 55 is needed as needed. Can be increased to increase the cross-sectional area of the flow path, so that pressure loss can be reduced even when the distance D is small. Further, in the present embodiment, the load of the cooling fan assembly 59 is deposited in the casing 21 and then the cooling fan assembly 59 is slid in the vehicle longitudinal direction to connect the first duct 51 and the second duct 55. Therefore, the assembly operator does not have to move the cooling fan assembly 59 sideways while supporting the weight of the entire cooling fan assembly 59, and can work in an assembly posture from substantially above, The same assemblability can be obtained.

  In the present embodiment described above, the bracket 58 has been described as a single groove shape, but a plurality of mounting arms may be provided on a flat plate as long as the bracket 58 is attached to the casing 21.

  10 vehicle, 11 compartment, 13 luggage space, 14 tire house, 15 rear wheel, 20 power storage device, 21 casing, 22 secondary battery, 23 DC-DC converter, 24 air inlet, 25 air outlet, 26 flange, 27 mounting 28, fixing bolt, 29, 31 nut, 30 mounting lug, 32, 63 bolt, 40 casing assembly, 50 cooling unit, 51 first duct, 51a, 55a air inlet end, 51b, 55b, 57b air outlet end, 51c Connection part, 54 Mounting arm, 55 Second duct, 56 Cooling fan, 57 Third duct, 58 Bracket, 59 Cooling fan assembly, 60 Sponge, 61,62 Mounting leg, 64 Screw hole, 65 Upper flange, 66 Web, 67 Lower flange, 68 Long hole.

Claims (4)

A method for mounting a cooling unit for an electric device for a vehicle,
Arranging a vehicle electrical device in a housing;
The first duct is connected so that one end of the first duct is connected to the electric device, and the other end of the first duct extends linearly along the side surface of the housing in the direction along the upper surface or the lower surface of the housing. Attaching to a housing to form a housing assembly;
Mounting the housing assembly to which the electrical device and the first duct are attached to the vehicle;
A cooling fan and a second duct, one end of which is connected to the cooling fan and a second duct whose outer shape is substantially the same as the inner shape of the other end of the first duct and extends linearly, are integrally attached to the bracket. An assembly process;
The other end of the first duct of the housing assembly mounted on the vehicle and the other end of the second duct of the cooling fan assembly are arranged coaxially, and the cooling fan assembly faces the first duct and the side surface of the housing Connecting the first duct and the second duct by fitting the other end of the second duct to the other end of the first duct by sliding in the direction along
A cooling unit mounting method characterized by comprising: It is a mounting method of the cooling unit of Claim 1, Comprising:
The housing houses a secondary battery for driving the vehicle, and the vehicle includes a pair of tire houses in the vehicle width direction,
The step of mounting the housing assembly on the vehicle includes mounting the housing assembly between the tire house so that the other end of the first duct extends in the front-rear direction of the vehicle between the side surface of the housing and the tire house.
The step of connecting the second duct includes dropping the other end of the second duct of the cooling fan assembly between the side surface of the housing and the tire house, and then sliding the cooling fan assembly in the front-rear direction of the vehicle.
A cooling unit mounting method characterized by A cooling unit for a vehicle electrical device attached to a housing together with the vehicle electrical device,
A cooling fan attached to the housing;
A first duct having one end connected to an electrical device and the other end extending linearly along a side surface of the housing in a direction along an upper surface or a lower surface of the housing;
A second duct having one end connected to the cooling fan and the other end extending linearly in the same direction as the other end of the first duct and fitted into the other end of the first duct;
A cooling unit comprising: The cooling unit according to claim 3,
The housing stores a secondary battery for driving the vehicle and is mounted between a pair of tire houses in the width direction of the vehicle.
The connecting portion between the other end of the first duct and the other end of the second duct is disposed between the side surface of the housing and the tire house;
Cooling unit characterized by

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