JP2005119598A - Vehicle with fuel cell system mounted thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle with a fuel cell system mounted thereon in which direct transmission of the vibration of the auxiliary machinery for a fuel cell to a vehicle body is prevented, the rigidity of the vehicle body is enhanced, the maintenance thereof is facilitated during the maintenance of the auxiliary machinery for the fuel cell or the like, and the degree of versatility of the layout of the auxiliary machinery for the fuel cell or the like is extended. <P>SOLUTION: Two side members extending in the longitudinal direction of a vehicle and a sub frame to connect the two side members via a vibration-isolating member from a lower side of the vehicle are provided on a lower side of a floor panel of the vehicle, and at least one auxiliary machinery for a fuel cell is mounted on the sub frame. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle equipped with a fuel cell system, and more particularly to a vehicle equipped with a fuel cell system in which an auxiliary machine or the like is attached to a floor panel via a subframe.

  As a vehicle fuel cell system, for example, a system that directly converts chemical energy into electrical energy by an electrochemical reaction between hydrogen and oxygen is used. In this fuel cell system, the air conditioning compressor needs to be driven by a motor, and the air conditioning compressor and motor serve as a vibration source. In order to supply the oxidizing gas to the fuel cell, an air supply compressor is provided as an air supply to the fuel cell, and a muffler is provided to suppress noise of the air supply compressor. Since this muffler generates vibration when absorbing the noise of the air supply compressor, it has been a vibration source like the air conditioning compressor.

Conventionally, in a fuel cell system of a vehicle, a box is composed of two side frames in the vehicle front-rear direction, two side frames in the vehicle left-right direction, two bottom frames, and a case surrounding these frames, Some are attached to the main frame.
Also, in a fuel cell system for a vehicle, a main motor is attached to a vehicle body frame via a vibration isolating member, and an air supply compressor and a compressor drive motor are attached to the main motor, and the air is prevented by the vibration isolating member. Some of them absorb vibration of a supply compressor and a compressor drive motor.
Japanese Patent Laid-Open No. 2003-146087 JP 2000-313239 A

  By the way, in the case of a conventional vehicle equipped with a fuel cell system, in the case of the above-mentioned Patent Document 1, in order to support a heavy object in the shape of the box, the box needs to have a predetermined strength. In order to increase the strength of the box, the weight of the box itself increases due to the configuration, and when a vibration source such as a compressor is present in the box, it affects other auxiliary machines in the box. In addition, when a part in the box breaks down, it is necessary to remove the entire box from the vehicle body, which makes it difficult to maintain. Further, in the case of the above-mentioned Patent Document 2, it is necessary to lay out a plurality of vibration sources at a time, and there is a problem that the layout is easily restricted.

  According to the present invention, in a vehicle equipped with a fuel cell system including a fuel cell and a fuel cell accessory, two side members extending in the vehicle front-rear direction and the two side members are provided on the lower surface of the vehicle floor panel. And a subframe that connects the vehicle from below through a vibration isolation member, and at least one fuel cell auxiliary machine is attached to the subframe.

  In a vehicle equipped with the fuel cell system of the present invention, two side members extending in the vehicle front-rear direction and the two side members are connected to the lower surface of the floor panel of the vehicle from below the vehicle via a vibration isolating member. Since a subframe is provided and at least one fuel cell auxiliary machine is attached to the subframe, a fuel cell auxiliary machine or the like is mounted between the fuel cell auxiliary machine or the like and the vehicle body in order to attach the fuel cell auxiliary machine or the like as a vibration source to the vehicle body. In addition, the vibration of the auxiliary device for the fuel cell is not directly transmitted to the vehicle body via the vibration isolation member and the sub frame, and the sub frame connects between the two side frames. These frames work together as a reinforcing member for the car body, which improves the rigidity of the car body, and when sub-frames are worn during maintenance of auxiliary equipment for fuel cells. Simply, maintenance was easily performed, moreover, it is possible to increase the degree of freedom of the layout of the auxiliary device for a fuel cell.

The present invention achieves the object of avoiding the influence of vibrations such as fuel cell auxiliaries by interposing an anti-vibration member and a subframe between the vehicle body.
Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 2 show an embodiment of the present invention.

  1 and 2, reference numeral 2 denotes a vehicle equipped with a fuel cell system (not shown) including a fuel cell, a vehicle driving motor, an air supply compressor for supplying oxidizing gas to the fuel cell, and 4 denotes a floor of the vehicle body. It is a panel. In the floor panel 4, a step space 8 is formed by a step wall portion 6 that protrudes upward and faces in the vehicle longitudinal direction X.

  On the lower surface of the floor panel 4, two side members 10, 10 on the vehicle body side extending in the vehicle front-rear direction X are spaced apart on both sides of the step space 8 and fixed by welding or the like.

  Further, the two side members 10 and 10 are provided with a sub-frame 14 that connects the two side members 10 and 10 via a plurality of mount units 12 from below the vehicle. The mount unit 12 includes a mount bracket 16 fixed to the lower part of the two side members 10, 10 by welding or the like, and a first vibration isolation member 18 as a vibration isolation member in close contact with the lower surface of the mount bracket 16. Become. The first vibration isolation member 18 absorbs vibration from the sub frame 14 side to the two side members 10 and 10.

  As shown in FIG. 1, the sub-frame 14 includes a pair of frame members 20, 20 oriented in the vehicle left-right direction Y and a plurality of connecting members linking the frame members 20, 20 oriented in the vehicle longitudinal direction X. 22.

  The sub-frame 14 is detachably attached to the lower surfaces of the two side members 10 and 10 via the mount unit 12 by mounting bolts (not shown) from below the vehicle. As a result, a frame space 24 is formed between the subframe 14 and the floor panel 4.

  In the frame space 24, a muffler 26 oriented in the vehicle front-rear direction X, for example, as an auxiliary device for at least one fuel cell is located above the subframe 14 and in the vicinity of the step space 8, and is a second anti-vibration member. 2 It is attached via a vibration isolating member 28. The muffler 26 suppresses noise of an air supply compressor (not shown) that supplies air to the fuel cell, is held by the muffler lower bracket 30 and the muffler upper bracket 32, and the lower part is the second part. The sub-frame 14 is elastically supported via the vibration-proof members 28 and 28.

  Further, in the frame space 24, for example, an air conditioning compressor 34 oriented in the vehicle front-rear direction X is provided via the third vibration isolation member 36 as a vehicle air conditioner on the upper side of the subframe 14 and in parallel with the muffler 26. It is attached. The air-conditioning compressor 34 compresses and supplies air-conditioning air, and fixing brackets 38 and 38 at both ends are connected via a mounting bracket 40 and the like on the subframe 14 side, and the third prevention It is elastically supported by the vibration members 36 and 36 and fixed to the subframe 14.

  In this embodiment, it is possible to provide not only fuel cell auxiliary equipment and vehicle air conditioning equipment but also vehicle electrical equipment on the upper side of the subframe 14.

  Next, the operation of this embodiment will be described.

  On the lower surface of the floor panel 4 of the vehicle 2, there are two side members 10, 10 extending in the vehicle front-rear direction X, and a first vibration isolation member 18 as a vibration isolation member between the two side members 10, 10 from below the vehicle. And a muffler 26 which is at least one auxiliary fuel cell device is attached to the subframe 14.

  Thus, in order to attach the muffler 26 as a fuel cell auxiliary machine serving as a vibration source to the vehicle body, the first vibration isolating member 18 and the subframe 14 are provided between the fuel cell auxiliary machine and the floor panel 4 of the vehicle body. The vibration of the fuel cell auxiliaries and the like does not propagate directly to the vehicle body, ensuring the function of the fuel cell auxiliaries and the like, and the subframe 14 connects the two side frames 10 and 10 together. Therefore, these frames serve as a reinforcing member for the vehicle body and improve the rigidity of the vehicle body. Furthermore, when performing maintenance of auxiliary equipment for fuel cells, etc., it is easy to perform maintenance by simply attaching and detaching the subframe 14 Moreover, it is possible to increase the degree of freedom of layout of fuel cell auxiliary equipment and the like.

  In addition, by attaching the fuel cell auxiliary equipment and the vehicle electrical equipment mounted in the vehicle longitudinal direction X to the subframe 14, the fuel cell auxiliary equipment and the vehicle electrical equipment, which are also vibration sources, are coupled to the vehicle body. However, since the first vibration isolation member 18 and the subframe 14 are interposed between the fuel cell auxiliary equipment and the vehicle electrical equipment, the vibration of the fuel cell auxiliary equipment and the vehicle electrical equipment is provided. However, it does not propagate directly to the car body.

  Further, the muffler 26 that is an auxiliary device for the fuel cell and the air conditioning compressor 34 that is the vehicle air conditioner are attached to the subframe 14 via the second and second vibration isolation members 28 and 36 as other vibration isolation members. Therefore, a two-stage vibration isolating structure is provided between the vehicle interior and the vibration source, and the vibration damping performance of the vehicle can be improved.

  That is, the air conditioning compressor 34 and the muffler 26 are respectively attached to the subframe 14 via the second and third vibration isolation members 28 and 42, and the subframe 14 is similarly mounted via the first vibration isolation member 18. Since the bracket 16 is fixed to the floor panel 4 of the vehicle body, the vibrations of the air conditioning compressor 34 and the muffler 26 can be absorbed by the vibration isolating members, and the influence of the vibrations of the air conditioning compressor 34 and the muffler 26 is affected by the vehicle body. Can be separated.

  Further, by managing the shape, material and weight of the subframe 14 with a degree of freedom, the natural frequency of the system can be changed, and the frequency of the vibration source and the resonance frequency of the system can be changed. By managing, vibrations of fuel cell auxiliary machines and the like can be efficiently suppressed.

  Furthermore, by improving the rigidity of the sub-frame 14, the sub-frame 14 can function as a vehicle body reinforcement component, and thus the rigidity of the vehicle body can be improved.

  Furthermore, when the subframe 14 is assembled to the vehicle body, the air conditioning compressor 34 and the muffler 26 as components in the subframe 14 can be assembled to the vehicle body at the same time, thereby improving the assemblability of each component. Can do.

  Furthermore, by adopting a configuration in which the first vibration isolation member 18 is sandwiched between the floor panel 4 and the subframe 14 of the vehicle body, vibration of the entire subframe 14 can be suppressed. Further, as shown in FIG. 2, the second and third vibration isolation members 36 and 42 are sandwiched between the air conditioning compressor 34 and the muffler 26, thereby suppressing vibrations of the air conditioning compressor 34 and the muffler 26. In addition, the anti-vibration effect can be further improved by using the first anti-vibration member 18 between the subframe 14 and the vehicle body.

  In the present invention, even if a cooling water pump, a hydrogen pump, or a vehicle driving motor is used as the vibration source, the same effect is obtained, and the vibration isolation member directly attached to the compressor and the muffler is removed, and the subframe and Even if the vibration isolation member is attached only to the vehicle body, the same effect can be obtained.

  A structure that prevents the vibration from directly propagating to the vehicle body can be applied to other vehicle body structures.

It is the figure which showed the principal part of this invention which looked at the vehicle from the downward direction. It is sectional drawing which showed the principal part of this invention.

Explanation of symbols

2 Vehicle 4 Floor panel 10 Side member 12 Mount unit 14 Subframe 16 Mount bracket 18 First vibration isolation member 26 Muffler 28 Second vibration isolation member 34 Air conditioning compressor 36 Third vibration isolation member

Claims (3)

  2. Description of the Related Art In a vehicle equipped with a fuel cell system including a fuel cell and a fuel cell auxiliary machine, two lower side members extending in the vehicle front-rear direction and a lower side of the vehicle are disposed on the lower surface of the vehicle floor panel. A vehicle equipped with a fuel cell system, wherein the vehicle is equipped with a subframe connected via a vibration isolating member and at least one auxiliary fuel cell device is attached to the subframe.   2. Description of the Related Art In a vehicle equipped with a fuel cell system including a fuel cell and a fuel cell auxiliary machine, two lower side members extending in the vehicle front-rear direction and a lower side of the vehicle are disposed on the lower surface of the vehicle floor panel. A fuel cell system is provided in which a fuel cell auxiliary device and vehicle electrical equipment mounted in the vehicle front-rear direction are attached to the subframe. Vehicle.   The vehicle equipped with the fuel cell system according to claim 1 or 2, wherein the fuel cell auxiliary machine or the vehicle air conditioner is attached to the subframe via another vibration isolation member. .

Images