JP4609639B2 - Junction box mounting structure - Google Patents

Description

  The present invention relates to a mounting structure for a junction box, and in particular, a holding member can be attached to a main floor without adding a special intermediate connector to a high voltage cable connected to a junction box disposed above the holding member on the lower side of the main floor. It is related with the mounting structure of the junction box which can be removed from.

  Vehicles include gasoline engine vehicles, diesel engine vehicles, gas engine vehicles, fuel cell vehicles, etc., depending on the fuel used. The fuel cell vehicle supplies hydrogen, which is fuel stored in a fuel tank, to the fuel cell, generates electric power by reaction with oxygen, and travels by driving a traveling motor with this electric power. A fuel cell vehicle is equipped with a plurality of auxiliary devices for fuel cells, and these auxiliary devices are often held by a holding member and disposed below the main floor of the vehicle body.

A conventional fuel cell vehicle is provided with a fuel cell system box as a holding member for storing and holding a fuel cell and fuel cell auxiliary equipment, and the fuel cell system box can be removed under the main frame of the vehicle. There are those that facilitate the maintenance of auxiliary machines and the replacement of parts by attaching and removing the fuel cell system box from the vehicle body.
JP 2003-146087 A

  By the way, in some fuel cell vehicles, a junction box is provided in order to distribute the electric power generated by the fuel cell to a plurality of high voltage components. The junction box is usually arranged in the vicinity of each high-voltage system component in order to reduce the length of the high-voltage cable, reduce the weight, and improve the manageability.

  However, the fuel cell system box or subframe, which is a holding member, is disposed below the main floor of the vehicle body, and a high voltage is applied to the front or rear of the vehicle body from a junction box held in the fuel cell system box or on the subframe. When routing the cables, considering the case where the fuel cell system box or sub-frame is removed from the vehicle body, it is necessary to provide an intermediate connector for connecting / disconnecting the cables to all high voltage cables.

  For this reason, in such a junction box mounting structure, there is a problem that an intermediate connector must be added to the high voltage cable, and a high voltage connector used for an intermediate connector of a high voltage cable is generally used. Due to its large size, there was a problem that led to an increase in cost.

According to the present invention, a junction box for distributing the power generated by the fuel cell to a plurality of high-voltage components and a high-voltage cable connected to the junction box are disposed below the main floor of the vehicle body, In a mounting structure of a junction box of a fuel cell vehicle in which a holding member holding a plurality of auxiliary devices for fuel cells is arranged on the side, the junction box is attached to a lower surface serving as a flat portion of the main floor via a bracket. , mounting the high voltage cable to the underside of the flat portion of the main floor, the holding member so as to form a compact auxiliary device installation space in the vertical direction between the upper surface of the lower surface and the holding member of the main floor the possibility to be removably secured to the lower surface of the main floor, the junction to the holding member Box is characterized in that to form a space surrounded by the plurality of members to be disposed.

The junction box mounting structure of the present invention removes the holding member from the main floor without adding a special intermediate connector to the high voltage cable connected to the junction box disposed above the holding member on the lower side of the main floor. Can do.

In the junction box mounting structure of the present invention , the holding member can be removed from the main floor without adding a special intermediate connector to the high voltage cable connected to the junction box.
Embodiments of the present invention will be described below with reference to the drawings.

  1 to 6 show an embodiment of the present invention. In FIG. 5, 2 is a vehicle body of a fuel cell vehicle (not shown), and 4 is a main floor constituting the vehicle body 2. The fuel cell vehicle supplies hydrogen, which is fuel stored in a fuel tank (not shown) disposed below the rear seat, to the fuel cell (not shown) to generate electric power by reaction with oxygen. The vehicle travels by driving a traveling motor (not shown) with electric power.

  The main floor 4 is provided with a tunnel portion 6 that protrudes upward in the center in the width direction and extends in the longitudinal direction of the vehicle body. Flat portions 8 and 10 are provided on both sides of the tunnel portion 6, respectively. A pair of parallel side members 12 and 14 that protrude and extend in the longitudinal direction of the vehicle body are provided.

  As shown in FIGS. 3 and 4, a subframe 16 is disposed below the main floor 4. As shown in FIG. 6, the sub-frame 16 includes a pair of parallel vertical members 18 and 20 extending in the longitudinal direction of the vehicle body, a plurality of horizontal members 22 to 30 connected to both ends of the vertical members 18 and 20, A plurality of auxiliary members 32 having both ends connected to the horizontal members 22 to 30 are formed in a square lattice shape.

  In the subframe 16, a space 34 in which a junction box 50-1 described later is disposed is formed. The space 34 is provided in a space surrounded by the vertical member 20 on the other side of the sub-frame 16, the two horizontal members 24, 26, and the one auxiliary member 32 having both ends connected to the horizontal members 24, 26. It is done.

  As shown in FIG. 6, the subframe 16 holds an air system pipe 36 for supplying air to the fuel cell mounted on the front side of the vehicle body 2 and a plurality of auxiliary devices 38 for the fuel cell.

  The air system pipe 36 includes an air introduction pipe 36-1, a heat exchanger 36-2, a surplus air discharge pipe 36-3, a muffler 36-4, and the like, and is arranged in the center of the subframe 16 so as not to interfere with the space 34. It is extended and held on the upper side of the vehicle body in the longitudinal direction of the vehicle body, and is disposed in the tunnel portion 6 in the center of the main floor 4.

  The auxiliary machine 38 includes a water pump 38-1 for cooling the fuel cell, a water pump 38-2 for cooling the inverter for the travel motor and the air conditioner, a first flow meter 38-3, a second flow meter 38-4, Water pump inverter 38-5, air conditioner compressor 38-6, air conditioner inverter 38-7, first valve 38-8, second valve 38-9, third flow meter 38-10, differential pressure gauge 38 -11 and the third valve 38-12, etc., are held on both sides of the air piping 36 so as not to interfere with the space 34, and are disposed in the tunnel portion 6 in the center of the main floor 4. The

  The sub-frame 16 is provided with a plurality of sub-frame side brackets 40 on the vertical members 18 and 20, and elastic mount members 42 are fixed to the sub-frame side brackets 40. The plurality of subframe side brackets 40 are provided so as to be positioned on the front side and the rear side of the space 34 in which a junction box 50-1 described later is disposed. Side member side brackets 44 are provided on the side members 12 and 14 of the main floor 4 at positions corresponding to the subframe side brackets 40, respectively.

  As shown in FIGS. 3 and 4, the subframe 16 is configured such that the mounting member 42 of the subframe side bracket 40 is attached to the side member side bracket 44 of the side members 12, 14 by mounting bolts 46, thereby Via the main floor 4.

  On the upper side of the sub-frame 16 and below the main floor 4, as shown in FIG. 5, fuel is supplied from a fuel tank mounted on the rear side of the vehicle body 2 to a fuel cell mounted on the front side of the vehicle body 2. A hydrogen system pipe 48 for supplying hydrogen and a power system component 50 for distributing power generated by the fuel cell to a plurality of high voltage system components (not shown) are provided. High-voltage components include air compressors, air conditioning compressors, air conditioning heaters, hydrogen circulation pumps, fuel cell DC / DC converters, start-up DC / DC converters, auxiliary battery DC / DC converters, and traveling There are motors.

  The hydrogen pipe 48 is composed of hydrogen supply pipes 48-1 and 48-2 disposed below the flat parts 8 and 10 on both sides of the tunnel part 6, and is supplemented to the hydrogen supply pipe 48-1 on the one side. A pressure sensor 38-13, a temperature sensor 38-14, and a fourth valve 38-15 are provided.

The hydrogen supply pipe 48-1 and the fourth valve 38-15 are attached to the lower side of the flat portion 8 on one side of the main floor 4 via a hydrogen-based piping bracket 52-1. The hydrogen supply pipe 48-2 on the other side is attached to the lower side of the flat portion 10 on the other side of the main floor 4 via a hydrogen piping bracket 52-2.

  The power system component 50 includes a junction box 50-1 disposed below the flat portion 10 on the other side of the tunnel portion 6, and a plurality of high voltage cables 50-2 connected to the junction box 50-1. Consists of

  As shown in FIGS. 1 and 2, the junction box 50-1 is a maintenance-free box that is attached to and detached from a cover-less bottomed box-like main body 50-1 a and an opening (not shown) on the lower surface of the main body 50-1 a. It consists of cover part 50-1b. The junction box 50-1 positions the main body 50-1a in a space 34 surrounded by the vertical member 20, the two horizontal members 24 and 26, and the auxiliary member 32 on the other side of the subframe 16, and the upper surface of the main body 50-1a. Are attached to the lower side of the flat portion 10 on the other side of the main floor 4 via a metal plate-like bracket 54-1 and a rod-like bracket 54-2.

  As a result, the junction box 50-1 causes the maintenance cover 50-1b on the lower surface of the main body 50-1a to face the space 34 of the subframe 16, and the elastic mount members 42 are provided on the front side and the rear side. The space 34 is formed in the sub-frame 16 fixed to the main floor 4.

The high voltage cable 50-2 is attached to the lower side of the flat portion 10 on the other side of the main floor 4 via a clamp-like bracket 56. In FIG. 5, an air conditioning heater relay 38-16, which is an auxiliary machine 38, is disposed on the front side of the junction box 50-1.

  Next, the operation will be described.

  The fuel cell vehicle supplies hydrogen, which is fuel stored in a fuel tank, to the fuel cell, generates electric power by reaction with oxygen in the air supplied by the air system pipe 36, and drives the traveling motor with this electric power. And run. The fuel cell vehicle includes a junction box 50-1 that distributes electric power generated by the fuel cell to a plurality of high voltage system components and a high voltage cable 50-2 connected to the junction box 50-1. 4 has a mounting structure of a junction box 50-1 in which a subframe 16 holding a plurality of auxiliary devices 38 for fuel cells is disposed below the main floor 4.

  In the mounting structure of the junction box 50-1, as shown in FIGS. 3 and 4, the junction box 50-1 for distributing power to the high voltage system parts is disposed above the subframe 16 and below the main floor 6 of the vehicle body 4. It is directly attached to the side via metal brackets 54-1 and 54-2.

  Similarly, the plurality of high voltage cables 50-2 connected to the junction box 50-1 are directly attached to the lower side of the main floor 4 of the vehicle body 2 via the clamp-like brackets 56.

  Thereby, the mounting structure of the junction box 50-1 allows the junction box 50-1 and the high voltage cable 50-2 to be connected to the vehicle body 2 even when the subframe 16 is removed from the vehicle body 2 for some maintenance or parts replacement. It can be removed while attached to.

  Therefore, the mounting structure of the junction box 50-1 is a high voltage intermediate that is required when the junction box 50-1 or the high voltage cable 50-2 connected to the junction box 50-1 is attached to the subframe 16. A connector can be dispensed with, and the structure can be simplified and the cost can be reduced.

  In addition, as shown in FIG. 1, the junction box 50-1 is mounted directly on the main floor 4 of the vehicle body 2 using metal brackets 54-1 and 54-2. Yes.

Thereby, when removing the sub-frame 16 from the vehicle body 2 , it is not necessary to remove the junction box 50-1, and the brackets 54-1 and 54-2 are made of metal, which is one of high-voltage components. It is also possible to make the junction box 50-1 equipotential with the vehicle body 2 at the same time.

Equipotential of the vehicle body 2 of the junction box 50-1 is important from the standpoint of securing a high voltage safety, thereby special such equipotential lines for connecting the junction box 50-1 and the vehicle body 2 It is possible to omit an electrical wiring.

  Further, the junction box 50-1 generally includes components such as a relay and a fuse (not shown), and maintenance of these components may be required.

As shown in FIG. 2, the junction box 50-1 is provided with a lid 50-1 b that can be removed for maintenance on the lower surface of the junction box 50-1, and the sub-frame 16 has a junction box 50- By providing a space 34 in the lower part of 1 without mounting other parts, the vertical member 20 on the other side of the subframe 16 and the two horizontal members can be removed without removing the subframe 16 from the vehicle body 2. The junction box 50-1 can be accessed from the space 34 surrounded by the members 24 and 26, and maintenance such as inspection and fuse replacement of the junction box 50-1 can be easily performed.

As described above, the junction box 50-1 is mounted on the lower side of the main floor 4 via the brackets 54-1 and 54-2, and the high voltage cable 50-2 is attached to the main floor. 4, and a space 34 in which the junction box 50-1 is disposed is formed in the subframe 16, so that the accessory mounting space is vertically moved between the lower surface of the main floor 4 and the upper surface of the subframe 16. It is possible to secure a necessary ground clearance by forming it compactly in the direction, and specially for the high voltage cable 50-2 connected to the junction box 50-1 disposed above the subframe 16 below the main floor 4. The sub-frame 16 can be removed from the main floor 4 without adding additional intermediate connectors Kill.

Since the brackets 54-1 and 54-2 for attaching the junction box 50-1 to the lower side of the main floor 4 are made of metal, the equipotential between the junction box 50-1 and the main floor 4 which are high voltage can be obtained. This makes it possible to eliminate the need for equipotential lines.

  Further, by providing a maintenance cover 50-1b on the lower surface of the junction box 50-1, the cover 50-1b can be removed using the space 34 of the subframe 16, and the subframe 16 can be removed. Without removing the main floor 4 from the main floor 4, the junction box 50-1 can be maintained.

Furthermore, the mounting structure of the junction box 50-1 is such that the subframe 16 is fixed to the main floor 4 via a plurality of elastic mounting members 42, and elastic mounting members are provided on the front side and the rear side of the junction box 50-1. 42, the mount member 42 can reduce the vibration of the subframe 16 between the front side and the rear side of the junction box 50-1, and the auxiliary equipment attached to the junction box 50-1 and the subframe 16 can be reduced. Interference with 38 can be effectively prevented.

  In the above embodiment, the junction box 50-1 is mounted above the subframe 16, but in addition to this, when mounted on the upper main floor 4 in the fuel cell system box (not shown). The same effect can be obtained. Further, even when the junction box 50-1 is not disposed below the main floor 4, the same effect can be obtained by mounting the high voltage cable 50-2 on the vehicle body 2. Furthermore, components that are not desired to be removed from the vehicle body 2 as much as possible, such as hydrogen-based components and hydrogen-based piping, can be attached to the vehicle body 2. Furthermore, it is applicable not only to a fuel cell vehicle but also to an electric vehicle having a junction box 50-1.

  The junction box mounting structure of the present invention is such that the holding member can be removed from the main floor without adding a special intermediate connector to the high voltage cable connected to the junction box of the fuel cell vehicle. The present invention can be applied not only to fuel cell vehicles but also to electric vehicles having junction boxes.

It is a perspective view of the state which saw through the junction box and the high voltage cable from the main floor upper part which shows an Example. It is the bottom view which visually recognized the junction box and high voltage cable from the subframe lower part. It is a side view after attaching a sub-frame to the main floor. It is a side view before attaching a sub-frame to a main floor. It is the perspective view of the state which saw through the hydrogen system components, the junction box, and the high voltage cable from the main floor upper part. It is a perspective view of a subframe in the state where air system parts and an auxiliary machine are mounted.

Explanation of symbols

2 Vehicle Body 4 Main Floor 16 Subframe 34 Space 36 Air System Piping 38 Auxiliary Machine 40 Subframe Side Bracket 42 Mount Member 44 Side Member Side Bracket 48 Hydrogen System Piping 50 Power System Parts 50-1 Junction Box 50-2 High Voltage Cable 50 -1a Box body 50-1b Lid 54-1 Bracket 54-2 Bracket 56 Clamp bracket

Claims (4)

A junction box that distributes the power generated by the fuel cell to a plurality of high-voltage components and a high-voltage cable connected to the junction box are disposed below the main floor of the vehicle body, and the fuel cell is disposed below the main floor. in mounting structure of the junction box of the plurality of auxiliary fuel cell vehicle which is disposed a holding member holding the use, is attached via a bracket to the underside of the junction box a flat portion of the main floor, the high voltage attach the cable to the underside of the flat portion of the main floor, the main floor of the holding member so as to form a compact auxiliary device installation space in the vertical direction between the upper surface of the holding member and the lower surface of the main floor capable fixed removably to the lower surface of said junction box to the holding member Mounting structure of a junction box, characterized in that the formation of the space surrounded by the plurality of members to be set.   The junction box mounting structure according to claim 1, wherein the bracket is made of metal. The junction box mounting structure according to claim 2 , wherein a lid for maintenance is provided on a lower surface of the junction box so as to be accessible from a space of the holding member .   3. The holding member is fixed to the main floor via a plurality of elastic mounting members, and the elastic mounting members are disposed on the front side and the rear side of the junction box. Junction box mounting structure.

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