JP2003182624A - Fuel cell unit mounting structure for fuel cell vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell unit mounting structure capable of improving the mounting safety of a fuel cell unit, and the efficiency of a layout space for piping and wiring. <P>SOLUTION: A sub frame 1 is formed by platy extruded material comprising a plurality of closed cross-sectional portions 2 and an opened cross-sectional portions 3, so that the strength and stiffness of the sub frame 1 is high, and the mounting stability of a fuel cell unit 4 can be improved. Piping 11 to 14 are arranged in a closed cross-sectional portion 2, and wiring 9 are arranged in an opened cross-sectional portion 3. Therefore, the piping 11 to 14 and the wiring 9 can be systematically arranged, and can decrease the exposure part and improve the layout space efficiency. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell unit mounting structure for a fuel cell vehicle.

[0002]

2. Description of the Related Art In a fuel cell vehicle, various main components such as a fuel cell stack are mounted on a subframe which is fastened and fixed to a body frame member.
As a mounting structure of such a vehicle drive power supply unit,
For example, there is one disclosed in JP-A-7-69237.

This is a system in which a plurality of batteries are mounted on a battery frame, the battery frames are butted against the lower surface of a floor frame member, fastened and fixed by bolts and nuts, and mounted on the lower side of the floor.

[0004]

Since the above-mentioned conventional technique is originally a battery mounting structure, even if it is directly applied to a fuel cell system, hydrogen, air, cooling water, and pure water necessary for the fuel cell system are required. It is difficult to configure a routing route that is complicated and does not take up a large layout space, such as a wiring harness and a harness.

Further, since the fuel cell unit uses hydrogen as a reaction gas, the arrangement of hydrogen pipes and the like has become a safety issue, and in addition, improvement of collision safety is required. .

Therefore, according to the present invention, the supporting rigidity of the fuel cell unit is high, and the pipes and wirings of the fuel cell unit can be advantageously arranged in the layout, and the fuel cell unit and its pipings and wirings are exclusively used. A fuel cell unit mounting structure for a fuel cell vehicle, which can be safely protected without using a protector.

[0007]

According to another aspect of the present invention, there is provided a subframe fastened and fixed to a body frame member.
The fuel cell unit is formed on a flat plate extruded material having a plurality of closed cross-sections and / or open cross-sections, and the fuel cell unit is mounted on the sub-frame, and the piping and wiring of the fuel cell unit are closed. It is characterized in that the wires are arranged in the cross section and / or the open cross section.

According to a second aspect of the invention, in the fuel cell unit mounting structure of the fuel cell vehicle according to the first aspect, the closed cross section and / or the open cross section of the sub-frame is formed in the vehicle front-rear direction, It is characterized in that a plurality of main constituent parts of the battery unit are arranged on the sub-frame in the longitudinal direction of the vehicle body.

According to the invention of claim 3, claims 1 and 2 are provided.
In the fuel cell unit mounting structure of the fuel cell vehicle described in (1), among the pipings of the fuel cell unit, the hydrogen piping is arranged in the closed cross-section portion of the central portion of the subframe.

In the invention of claim 4, claims 1 to 3 are provided.
In the fuel cell unit mounting structure for a fuel cell vehicle described in (1), the subframe is arranged behind the front suspension member and below the vehicle body floor.

According to the invention of claim 5, claims 1 to 4 are provided.
In the fuel cell unit mounting structure of the fuel cell vehicle described in (1), the closed cross-section portion of the sub-frame is configured as a part of the pipe to connect the pipes.

[0012]

According to the invention described in claim 1, the sub-frame on which the fuel cell unit is mounted is formed of a flat plate-shaped extruded material having a plurality of closed cross-sections and / or open cross-sections. The subframe itself has high strength and rigidity, and therefore the fuel cell unit has high supporting rigidity and mounting stability can be improved.

Further, since the pipes and wirings are routed inside the closed cross section and / or the open cross section of this sub-frame, these pipes and wirings can be separately sorted and arranged neatly, and on the sub-frame. It is possible to reduce the exposed portion of the pipe and improve layout space efficiency.

Moreover, the fuel cell unit and the piping and wiring can be protected from chipping without using a dedicated protector, and the strength of the subframe can be improved.
Since the rigidity is high, the fuel cell unit, the piping, and the wiring can be safely protected in both the front-rear collision and the side collision.

According to the invention described in claim 2, claim 1
In addition to the effects of the present invention, since the closed cross section and / or the open cross section of the subframe are formed in the vehicle front-rear direction, the rigidity of the subframe against front-back collision is high, and the fuel cell unit and its piping and wiring The protection and safety can be further enhanced.

Further, since a plurality of main constituent parts of the fuel cell unit are arranged in a so-called vertical arrangement in which the main constituent parts are arranged in the front-rear direction, it is possible to simplify a wiring pattern of piping and wiring extending between these main constituent parts, and to arrange them more orderly. Can be routed.

Further, since the pipe extending over the main components can extend in the front-rear direction, which occupies most of them, in the closed cross section of the sub-frame, the layout space efficiency can be further improved. it can.

According to the third aspect of the invention, in addition to the effects of the first and second aspects of the invention, since the hydrogen pipe is routed in the closed cross section of the central portion of the subframe, a side collision occurs. The protection of the hydrogen pipe at the time can be improved.

According to the invention of claim 4, claim 1
In addition to the effects of the inventions of 3 to 3, since the sub-frame is arranged behind the front suspension member and below the vehicle body floor, the collision load transmitted from the front suspension member is transmitted from the sub-frame at the time of a frontal collision. The crushing reaction force can be increased by being distributed to the floor side members, the collision energy absorbing action due to the crushing deformation of the vehicle body front can be promoted to enhance the energy absorbing effect, and the cabin can be prevented from being deformed. The wiring can be protected, and the collision safety can be further enhanced.

According to the invention of claim 5, claim 1
In addition to the effects of the inventions of 4 to 4, since the closed cross section of the sub-frame is effectively used as a part of the pipe, the pipe length can be shortened and the cost and weight can be advantageously obtained. .

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3, reference numeral 1 denotes a subframe on which a fuel cell unit, which will be described later, is mounted. The subframe 1 is a flat rectangular flat plate having a plurality of closed cross-section portions 2 made of a lightweight metal material such as an aluminum alloy. It is extruded into a shape.

In this embodiment, the closed cross section 2 is formed in the vehicle front-rear direction of the sub-frame 1, and the upper wall thereof is cut off at the front side portion of the closed cross-section 2 at the center of the sub-frame 1 in the vehicle width direction. The open cross section 3 is formed.

The sub-frame 1 is fastened and fixed to the lower surface of the vehicle body floor 21 behind the front suspension member 22 and to the lower surface of a floor frame member (vehicle frame member) (not shown) joined to the lower surface of the vehicle body floor 21. Thus, the sub-frame 1 is formed with a width dimension within the range of the projection plane of the vehicle body floor 21.

Reference numeral 4 denotes a fuel cell unit whose main constituent parts are a fuel cell stack 5, a humidifier 6, an air compressor 7, etc., and these main constituent parts 5 to 7 are subframes 1.
The air compressor 7, the fuel cell stack 5, and the humidifier 6 are vertically arranged in the longitudinal direction in the central portion of the upper surface of the vehicle from the front side.

The fuel cell stack 5 is additionally provided with a power distribution unit 8 for controlling the load (current) taken out from the fuel cell stack 5. this is,
In particular, in the case of a system including a secondary battery, the load from the fuel cell stack 5 is not allocated to driving the vehicle and charging the secondary battery, and the fuel cell stack 5 does not generate sufficient output for driving the vehicle. It sometimes extracts electric power for driving the vehicle from the secondary battery.

Power distribution unit 8
A wiring 9 is connected to the front side surface of the sub-frame 1. The wiring 9 is routed in the open cross-section 3 of the subframe 1 and mounted in the motor room in front of the subframe 1 (not shown). I am trying to connect to.

A hydrogen pipe 11 is connected across the humidifier 6 and the fuel cell stack 5, an air pipe 12 is connected across the air compressor 7, the fuel cell stack 5 and the humidifier 6, and the fuel cell is also connected. Cooling water piping 1 for stack 5
3 and a humidifier 6 are connected to pure water pipes 14, and the hydrogen pipe 11, the air pipe 12, the cooling water pipe 13, and the pure water pipe 14 are partially connected to the subframe 1 respectively. The hydrogen pipe 11 is routed in the closed cross-section portion 2, but the hydrogen pipe 11 is routed in the closed cross-section portions 2a to 2f at the center of the subframe 1.

In this embodiment, the front ends of the closed cross-sections 2a to 2j of the sub-frame 1 are closed by an end plate 15, and two bulkheads 16a, 16 are provided in the closed cross-section 2b.
b, one bulkhead 16c in the closed cross section 2c,
Three bulkheads 16d, 16e, in the closed cross section 2d,
16f, one bulkhead 16g in the closed cross section 2e
2 bulkheads 16h, 16 in the closed cross section 2f.
i, one bulkhead 16j in the closed cross section 2g,
The three bulkheads 16K, 16l, and
16m, one bulkhead 16n in the closed cross section 2i
Are provided to separate the inside of the closed cross-sections 2b to 2i, and these closed cross-sections 2b to 2i are effectively used as a part of the piping.

Specifically, the hydrogen supply pipe 11a and the hydrogen discharge pipe 11b are connected to the rear surface of the humidifier 6, while the hydrogen supply pipe 11c and the hydrogen discharge pipe 11 are connected to the rear surface of the fuel cell stack 5.
d to connect the hydrogen derivation pipe 11b and the hydrogen introduction pipe 11
c and the bulkhead 1 of the closed cross section 2d of the subframe 1
The hydrogen derivation pipe 11d is connected to the bulkheads 16h and 16i of the closed cross section 2f by penetrating the closed cross section between 6e and 16f.
The hydrogen discharge pipe 11e is penetratingly connected to the rear portion of the closed cross section, and the closed cross section portion 2
By effectively using d and 2f as a part of the hydrogen pipe 11, FIG.
To form a hydrogen path indicated by an arrow A.

Further, the air introduction pipe 1 is attached to the air compressor 7.
2b and the air outlet pipe 12c are connected to each other, the air inlet pipe 12d and the air outlet pipe 12e are connected to the front surface of the humidifier 6, and the air inlet pipe 12f and the air outlet pipe 12g are connected to the front and rear surfaces of the fuel cell stack 5. Connect.

Then, the air outlet pipe 12c and the air inlet pipe 12d are connected by penetrating in the closed cross section between the bulkheads 16a and 16b of the closed cross section 2b of the sub-frame 1, and the air outlet pipe 12e and the air intake pipe. The pipe 12f is connected to the closed section 2h through the bulkheads 16l and 16m in the closed section, and the air outlet tube 12g is opened in the closed section where the rear end of the bulkhead 16n of the closed section 2i is open. Meanwhile, the air introduction pipe 12b of the air compressor 7 penetrates and connects in the closed cross section between the front end plate 15 of the closed cross section 2h and the bulkhead 16k, and the air supply pipe 12a is connected to the end plate. The air passage shown by the arrow B in FIG. 2 is configured by penetrating 15 and connecting in the same closed cross section, and effectively utilizing these closed cross section portions 2b, 2h, 2i as a part of the air pipe 12.

A cooling water introducing pipe 13b and a cooling water introducing pipe 13c are connected to the front surface of the fuel cell unit 5, and the cooling water introducing pipe 13b is connected to the front end plate 15 of the closed cross section 2e of the subframe 1 and the bulkhead. The cooling water supply pipe 13a penetrates the end plate 15 and is connected to the inside of the closed cross section, while the cooling water supply pipe 13c connects the cooling water supply pipe 13c to the front end plate of the closed cross section 2d. 15 and the bulkhead 16d are pierced and connected in the closed cross section, and the cooling water discharge pipe 13d is pierced through the end plate 15 and connected in the same closed cross section, and these closed cross section portions 2d and 2e are cooled water. The cooling water path shown by an arrow C in FIG. 2 is configured by being effectively used as a part of the pipe 13.

Further, a pure water introducing pipe 14b is provided on the front surface of the humidifier 6.
And a pure water supply pipe 14c are connected to each other, and the pure water supply pipe 14b is connected to the pure water supply pipe 14b by penetrating and connecting to the front end plate 15 of the closed cross section 2c of the subframe 1 and the bulkhead 16c. 14a penetrates the end plate 15 and is connected in the same closed cross section, while the pure water outlet pipe 14c is connected in the closed cross section between the front end plate 15 of the closed cross section 2g and the bulkhead 16j. A pure water discharge pipe 14d is penetrated through the end plate 15 and connected in the same closed cross section, and these closed cross section portions 2c and 2g are effectively used as a part of the pure water pipe 14 and shown by an arrow D in FIG. It constitutes the pure water path.

In FIG. 3, reference numeral 23 denotes left and right front side members which are front and rear skeleton members of the front compartment, and the front suspension member 22 is attached to the front side members 23. Reference numeral 24 denotes a seat arranged on the vehicle body floor 21.

According to the structure of the above embodiment, the sub-frame 1 having the fuel cell unit 4 mounted thereon is formed of a flat plate extruded material having a plurality of closed cross-sections 2a to 2j and a partially open cross-section 3. Therefore, the strength and rigidity of the sub-frame 1 itself are high, and therefore, the supporting rigidity of the fuel cell unit 4 is high and the mounting stability can be improved.

The closed cross section 2b of the sub-frame 1
2i, the hydrogen pipe 11, the air pipe 12, the cooling water pipe 13, and the pure water pipe 14 of the fuel cell unit 4 are arranged, and the wiring 9 of the power distributor unit 8 is arranged in the open cross section 3. Therefore, these pipes 11 to 11
14 and the wiring 9 can be respectively divided and arranged in an orderly manner, and the exposed portions of the pipes 11 to 14 on the subframe 1 can be reduced, and the layout space efficiency can be improved.

Moreover, the fuel cell unit 4, the pipes 11 to 14, and the wiring 9 can be protected from chipping and the like without using a dedicated protector, and the strength and rigidity of the subframe 1 are high, so that the collision in the front-rear direction is caused. The fuel cell unit 4, the pipes 11 to 14, and the wiring 9 can be safely protected in any of the following cases.

Here, particularly in the present embodiment, since the sub-frame 1 is arranged behind the front suspension member 22 and below the vehicle body floor 21, the front suspension member 22 at the time of a frontal collision. The collision load transmitted from the subframe 1 is supported by the subframe 1 to be distributed to the floor frame members (not shown) to enhance the crush reaction force, and the collision energy absorbing action due to the crush deformation of the front of the vehicle body is promoted to enhance the energy absorbing effect. In addition to being able to prevent the deformation of the cabin, the fuel cell unit 4 and the pipes 11 to 14 and the wiring 9 can be protected.
Collision safety can be further enhanced.

In particular, since the closed cross section 2 and the open cross section 3 of the sub-frame 1 are formed in the vehicle front-rear direction, the rigidity of the sub-frame 1 against a front-rear collision is high, and the fuel cell unit 4 and its pipes 11 to 11 are formed. 14, the protection and safety of the wiring 9 can be further improved.

Further, since the main components such as the air compressor 7, the fuel cell stack 5, the humidifier 6, etc. of the fuel cell unit 4 are arranged in tandem in the front-rear direction, the pipes extending between these main components 5 to 7 are arranged. The wiring patterns of 11 to 14 and the wiring 9 can be simplified, and the wiring can be arranged more orderly.

Moreover, the pipes 11 to 14 extending between the main components 5 to 7 can be arranged in the closed cross-section 2 of the sub-frame 1 by extending the front-rear direction occupying most of them. The layout space efficiency can be further improved.

Of the pipes 11 to 14, the hydrogen pipe 11 is connected to the closed cross-section portion 2d at the center of the subframe 1,
Since the wires are arranged in the 2f, the protection of the hydrogen pipe 11 at the time of a side collision can be enhanced.

Further, in the present embodiment, the closed cross-section portions 2b to 2i of the subframe 1 are effectively used as a part of each of the pipes 11 to 14, so that the pipe length can be shortened and the cost can be reduced. It can be obtained in terms of weight.

In the above embodiment, the open cross section 3 is formed in the front portion of the closed cross section 2f of the sub-frame 1 and the wiring 9 is routed here, but the entire closed cross section 2f is closed. The wiring 9 can be inserted and routed in the inside as a cross section.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a side view showing a mounting state on the vehicle body according to the embodiment of the present invention.

[Explanation of symbols]

1 subframe 2 (2a to 2j) Closed cross section 3 Open section 4 Fuel cell unit (main components) 5 Fuel cell stack (main components) 6 Humidifier (main components) 7 Air compressor (main components) 8 Power distributor (main components) 9 wiring 11 (11a-11e) Hydrogen piping 12 (12a-12g) Air piping 13 (13a-13d) Cooling water piping 14 (14a-14d) Pure water piping 21 Body floor 22 Front suspension member

Claims (5)

[Claims] 1. A subframe fastened and fixed to a body frame member is formed of a flat plate extruded material having a plurality of closed cross-sections and / or open cross-sections, and a fuel cell unit is mounted on the sub-frame. In addition, the fuel cell unit mounting structure for a fuel cell vehicle is characterized in that the piping and wiring of the fuel cell unit are arranged in the closed cross section and / or the open cross section of the subframe. 2. The closed cross section and / or the open cross section of the subframe are formed in the vehicle front-rear direction, and a plurality of main components of the fuel cell unit are arranged in the vehicle front-rear direction on the subframe. A fuel cell unit mounting structure for a fuel cell vehicle according to claim 1. 3. The fuel cell unit for a fuel cell vehicle according to claim 1, wherein among the pipes of the fuel cell unit, a hydrogen pipe is arranged in a closed cross-section portion of a central portion of the subframe. Mounting structure. 4. The fuel cell unit mounting structure for a fuel cell vehicle according to claim 1, wherein the sub-frame is provided behind the front suspension member and below the vehicle body floor. 5. The fuel cell unit mounting structure for a fuel cell vehicle according to claim 1, wherein the closed cross-section portion of the sub-frame is formed as a part of a pipe, and the pipe is connected. .