JP2021063522A - High pressure tank mounting structure - Google Patents

Abstract

To provide a high pressure tank mounting structure which can secure vibration resistance performance when a vehicle travels and inhibit increase of an internal pressure of a high pressure tank when the vehicle is heated from the vehicle outer side.SOLUTION: A high pressure tank mounting structure 10 includes: a tank storage part 26; an under cover 54 including an upper member 56 provided at an area of a vehicle 12 below a high pressure tank 20 and forming a bottom wall of the tank storage part 26, and a lower member 58 disposed at an area of the vehicle 12 below the upper member 56, forming a space SP with the upper member 56, and including a vehicle lower side surface forming a part of a bottom surface of the vehicle 12; and a joint member 66 which is disposed in the space SP, joins the upper member 56 to the lower member 58 by a vehicle upper side end part being joined to a vehicle lower side surface of the upper member 56 and a vehicle lower side end part being joined to a vehicle upper side surface of the lower member 58, and melts by heating.SELECTED DRAWING: Figure 4

Description

The present invention relates to a high pressure tank mounting structure.

Patent Document 1 below discloses a high-pressure container in which a plurality of tanks are housed inside a case provided on the lower side of a vehicle of a floor panel forming a floor portion of a vehicle interior. The plurality of tanks are arranged on the upper surface of the bottom wall portion of the case. Further, on the vehicle rear side of the hole formed through the front wall portion of the case along the vehicle front-rear direction, a manifold for communicating a plurality of tanks is provided and the case is formed in a cylindrical shape along the vehicle front-rear direction. The pipe part is arranged through. A valve equipped with a fusible plug valve that operates by heating is inserted on the front side of the vehicle in the pipe portion. Therefore, when the bottom wall portion of the case is heated, the heat applied to the bottom wall portion is transferred to the fusible plug valve via the front wall portion of the case and the valve. As a result, the fusible plug valve is released, and the hydrogen gas stored in the tank is discharged to the outside of the high-pressure container via the fusible plug valve.

Japanese Unexamined Patent Publication No. 2019-35442

However, in the high-pressure container described in Patent Document 1, when the portion of the bottom wall of the case on the rear side of the vehicle, which is opposite to the side where the fusible plug valve is provided, is locally heated, the bottom The heat applied to the wall may be transferred to the rear part of the tank before being transferred to the fusible plug valve. Therefore, the internal pressure of the tank may increase before the fusible plug valve operates. Therefore, for example, it is conceivable to obtain a heat insulating effect by forming a cavity inside the bottom wall of the case, but the bottom wall in which the cavity is formed has a lower rigidity than the bottom wall in which the cavity is not provided. Therefore, it may not be possible to obtain the rigidity required to ensure the vibration resistance performance when the vehicle is running.

In consideration of the above facts, an object of the present invention is to obtain a high-pressure tank mounting structure capable of ensuring vibration resistance during vehicle running and suppressing an increase in the internal pressure of the high-pressure tank when the vehicle is heated from the outside of the vehicle. is there.

The high-pressure tank mounting structure according to claim 1 is provided on the lower side of the vehicle on the floor panel forming the floor of the passenger compartment, the tank accommodating portion in which the high-pressure tank is housed, and the lower side of the high-pressure tank on the vehicle. A space is formed between the plate-shaped upper member that forms the bottom wall of the tank accommodating portion and the upper member that is arranged on the lower side of the vehicle and the lower surface of the vehicle is the vehicle. An undercover provided with a lower member forming a part of the bottom surface of the vehicle, and an end portion on the upper side of the vehicle are adhered to the lower surface of the vehicle and the vehicle is arranged inside the space. The upper member and the lower member are joined by adhering the lower end to the surface of the lower member on the upper side of the vehicle, and the joining member is melted by being heated.

According to the high-pressure tank mounting structure according to claim 1, the upper member provided on the lower side of the vehicle of the high-pressure tank and forming the bottom wall of the tank accommodating portion, and the upper member arranged on the lower side of the vehicle with the upper member. An undercover with a lower member that forms a space between them is arranged. Further, inside the formed space, the upper end of the vehicle is adhered to the lower surface of the upper member of the vehicle, and the lower end of the vehicle is adhered to the upper surface of the lower member of the lower member. As a result, a joining member that joins the upper member and the lower member is arranged. Therefore, the rigidity of the undercover provided with the upper member and the lower member can be improved. Thereby, for example, it is possible to secure the vibration resistance performance against the vibration generated in the vehicle body when traveling on a rough road.

Further, according to the high-pressure tank mounting structure according to claim 1, the joining member is melted by being heated. Therefore, for example, when the lower member is heated, the heat applied to the lower member is transferred to the joining member, and the joining member melts, so that the upper member and the lower member are not joined. As a result, a heat insulating effect can be generated by the air layer between the upper member and the lower member, and an increase in the internal pressure of the high pressure tank when the vehicle is heated from the outside of the vehicle can be suppressed.

As described above, the high-pressure tank mounting structure according to the present invention has an excellent effect of ensuring vibration resistance when the vehicle is running and suppressing an increase in the internal pressure of the high-pressure tank when the vehicle is heated from the outside of the vehicle. Has.

It is a schematic side view which shows the vehicle to which the high pressure tank mounting structure which concerns on 1st Embodiment is applied. It is a top view which shows the whole structure of the tank accommodating part which concerns on 1st Embodiment. It is a cross-sectional view which shows the state cut by the 3-3 line of FIG. 2 in an enlarged manner. It is a side view of the lower part of the vehicle provided with the heat deformation part which concerns on 1st Embodiment. It is a schematic side view which shows the state which the thermal deformation part which concerns on 1st Embodiment is deformed. It is a side view of the lower part of a vehicle provided with the heat deformation part which concerns on the inverse proportion. It is a side view of the lower part of the vehicle provided with the heat deformation part which concerns on 2nd Embodiment.

Hereinafter, the first embodiment of the high-pressure tank mounting structure 10 according to the present invention will be described with reference to FIGS. 1 to 5. In the following figures, the arrow FR indicates the front side of the vehicle in which the high-pressure tank mounting structure 10 is provided, the arrow UP indicates the upper side of the vehicle, and the arrow W indicates the vehicle width direction.

(Fuel cell vehicle 12)
The fuel cell vehicle 12 (hereinafter, referred to as a vehicle 12) as a vehicle to which the high-pressure tank mounting structure 10 is applied includes a drive motor 14 as a drive means. The drive motor 14 is arranged, for example, in a vehicle rear portion of the vehicle 12. Further, the drive motor 14 is mechanically connected to the rear wheels 16 as the drive wheels of the vehicle 12 directly or indirectly via a transmission means such as a reduction gear train. Therefore, the driving force output from the driving motor 14 can be transmitted to the rear wheels 16.

A fuel cell stack 18 is provided at the front of the vehicle. The fuel cell stack 18 has a structure in which a plurality of unit cells are laminated in series, and functions as a high-voltage power source. The fuel cell stack 18 is connected to a plurality of high-pressure tanks 20 made of aluminum alloy and an air compressor (not shown). In the following description, the plurality of high-pressure tanks 20 will be described as being made of an aluminum alloy, but the present invention is not limited to this, and the high-pressure tank may be configured mainly by a resin.

Each unit cell constituting the fuel cell stack 18 generates electricity by an electrochemical reaction between hydrogen gas as a fluid or fuel gas supplied from the high-pressure tank 20 and oxygen in compressed air supplied from an air compressor. Further, the vehicle 12 is provided with a storage battery (not shown). The storage battery is a rechargeable secondary battery, and for example, a nickel hydrogen secondary battery or a lithium hydrogen secondary battery is used. The drive motor 14 is driven by the electric power supplied from the storage battery. The regenerative power generated by driving the drive motor 14 is recovered and charged in the storage battery when the vehicle 12 is braked.

(Tank housing part 26)
A tank accommodating portion 26 capable of accommodating the high-pressure tank 20 is formed on the vehicle lower side of the floor panel 24 forming the floor portion of the vehicle interior 22 in the vehicle 12. The tank accommodating portion 26 forms a part of the lower part of the vehicle 12 between the front wheels 28 and the rear wheels 16.

As shown in FIG. 2, a front bracket 30 extending along the vehicle width direction is arranged at the end of the tank accommodating portion 26 on the vehicle front side, and the end portion of the tank accommodating portion 26 on the vehicle rear side. A rear bracket 32 extending along the vehicle width direction is arranged in the vehicle. Further, a manifold 34 for communicating a plurality of high-pressure tanks 20 is fixed to the front bracket 30. The high-pressure tank 20 is housed in the tank accommodating portion 26 by connecting the front end to the manifold 34 and fixing the rear end to the rear bracket 32.

The front bracket 30 is made of two channel steels 36. Specifically, the flange portion of the second front side channel steel (not shown) opened toward the front side of the vehicle is joined to the groove portion of the first front side channel steel 36 opened toward the front side of the vehicle. It is composed of.

As shown in FIG. 3, the rear bracket 32 is composed of two channel steels 38 and 40. Specifically, the flange portions 40A and 40B of the second rear channel steel 40 opened toward the rear of the vehicle are joined to the groove of the first rear channel steel 38 opened toward the rear of the vehicle. It is composed of.

As shown in FIG. 2, both ends of the front bracket 30 and the rear bracket 32 in the vehicle width direction are fixed to the vehicle 12 by being joined to a vehicle skeleton member such as a rocker (not shown). Further, as shown in FIGS. 2 and 3, the upper ends of the front bracket 30 and the rear bracket 32 are bolted to the floor panel 24 (the front bracket 30 is not shown). Specifically, the flange portion 30A on the vehicle upper side of the front bracket 30 and the flange portion 38A on the vehicle upper side of the first rear channel steel 38 constituting the rear bracket 32 are bolted to the floor panel 24, respectively. There is.

As shown in FIG. 2, bases 42 are attached to the front ends of the plurality of high-pressure tanks 20 on the vehicle front side. The bases 42 of the plurality of high-pressure tanks 20 are each connected to the manifold 34. As a result, the internal spaces of the plurality of high-pressure tanks 20 are communicated with each other. The manifold 34 extends along the front bracket 30 with the vehicle width direction as the longitudinal direction. Inside the manifold 34, a general flow path 34A that communicates with the internal spaces of the plurality of high-pressure tanks 20 is formed. Further, the general flow path 34A is connected to a valve (not shown) provided on the front side of the vehicle of the front bracket 30 at a substantially central portion in the vehicle width direction.

The rear end of the plurality of high-pressure tanks 20 on the vehicle rear side is fixed to the rear bracket 32 via a base 42 provided at the rear end of the high-pressure tank 20 on the vehicle rear side. As a result, the high pressure tank 20 is fixed to the vehicle 12.

The manifold 34 includes a discharge flow path 34B branched from the general flow path 34A. The discharge flow path 34B has a lateral flow path 34B1 extending from the general flow path 34A toward the rear side of the vehicle and one end at the rear end of the horizontal flow path 34B1 (the end opposite to the general flow path 34A). When connected to, the other end is configured to include an external discharge flow path (not shown) connected to the outside of the vehicle 12.

The rear end portion of the lateral flow path 34B1 in the discharge flow path 34B is opened on the vehicle rear side surface of the manifold 34. This opening is closed by a heat-operated pressure release device 50 (hereinafter, referred to as a pressure release device 50) attached to the rear side of the vehicle of the manifold 34. Specifically, a horizontal axis (not shown) provided on the vehicle upper side of the pressure relieving device 50 and having an overall shape substantially the same as the inner peripheral shape of the lateral flow path 34B1 of the discharge flow path 34B is provided in the lateral flow path 34B1. It is blocked by being inserted from the rear side. Further, the connecting portion between the horizontal flow path 34B1 and the external discharge flow path is also blocked by the horizontal axis.

The rear end of the horizontal axis extends in the vertical direction of the vehicle and is lifted upward by the urging means such as a spring and a soluble alloy that melts when the temperature exceeds a predetermined temperature (both are not shown). It is locked by a vertical member (not shown). Therefore, the pressure relieving device 50 is heated and the soluble alloy is melted, so that the vertical member is lowered to the lower side of the vehicle by its own weight. The horizontal axis inserted into the lateral flow path 34B1 is moved toward the rear side of the vehicle by receiving pressure from the hydrogen gas flowing into the lateral flow path 34B1 because the rear end portion of the vehicle is not locked. As a result, the lateral flow path 34B1 and the external discharge flow path are communicated with each other, so that the hydrogen gas flowing through the general flow path 34A is discharged to the space outside the vehicle 12.

As shown in FIG. 3, a metal undercover 54 having an upper member 56 and a lower member 58 is arranged on the vehicle lower side of the tank accommodating portion 26. On the lower side of the vehicle of the high-pressure tank 20 fixed to the front bracket 30 and the rear bracket 32, a plate-shaped upper member 56 extending in the front-rear direction of the vehicle is arranged while forming the bottom wall of the tank accommodating portion 26. ing.

A metal installation plate 60 formed in a plate shape is joined to the upper surface of the upper member 56 on the vehicle upper side. The high-pressure tank 20 is arranged on the upper surface (the surface on the upper side of the vehicle) of the installation plate 60. Rubber non-slip members 62 formed along the outer peripheral shape of the high-pressure tank 20 are attached to the front end of the high-pressure tank 20, the substantially central portion in the front-rear direction of the vehicle, and the outer periphery of the rear end of the vehicle. ing. The high-pressure tank 20 is arranged on the upper surface of the installation plate 60 with the non-slip member 62 attached. As a result, the high-pressure tank 20 can be stably arranged on the upper surface of the installation plate 60 and can prevent the adjacent high-pressure tanks 20 from coming into contact with each other and interfering with each other.

The rear ends of the upper member 56 are bolted to both ends of the rear bracket 32 in the vehicle width direction via weld nuts 46 joined to the flange portions 38B on the lower side of the vehicle. Further, both ends of the upper member 56 in the vehicle width direction are fixed to the vehicle 12 by being joined to a vehicle skeleton member such as a rocker (not shown).

A substantially rectangular lower member 58 having a cross section along the front-rear direction of the vehicle and the vertical direction of the vehicle convex toward the lower side of the vehicle is joined to the lower surface (the surface on the lower side of the vehicle) of the upper member 56. Has been done. The vehicle front side end portion (not shown) of the lower member 58 and the vehicle rear side end portion 58A are respectively joined to the vehicle lower side surface of the upper member 56 by welding or the like. Further, the portion of the lower member 58 protruding toward the lower side of the vehicle is a protruding portion 64, and the lower surface (the surface on the lower side of the vehicle) 64A1 of the bottom plate 64A at the lower end of the protruding portion 64 is the bottom surface of the vehicle 12. Forming a part of.

As shown in FIG. 4, a space SP is formed between the upper member 56 and the lower member 58. Inside the space SP, a plurality of joining members 66 are arranged along the vehicle front-rear direction. Here, the joining member 66 extends along the vehicle width direction, and the cross section along the vehicle front-rear direction and the vehicle vertical direction is formed in a substantially rectangular shape in a side view. Further, the joining member 66 is adhered to the lower surface of the upper member 56 via the adhesive 68 on the upper side of the vehicle and to the upper surface of the lower member 58 via the adhesive 68 on the lower side of the vehicle. Has been done. For the adhesive 68, for example, a mastic adhesive or the like is used. As a result, the upper member 56 and the lower member 58 are joined via the joining member 66.

The joining member 66 is made of a material that melts at a predetermined temperature, such as rubber or resin. Therefore, the joining member 66 is configured to be melted by heat transfer from the lower member 58 when the lower member 58 is heated from the outside of the vehicle 12.

(Action and effect)
Next, the action and effect of this embodiment will be described through comparison with the inverse proportion shown in FIG.

According to the high-pressure tank mounting structure 70 related to the inverse proportion, as shown in FIG. 6, in order to secure the rigidity of the undercover 72 formed by the upper member 56 and the lower member 58, the bottom plate of the lower member 74 is secured. The bead portion 76 is formed in the 74A so as to project toward the upper side of the vehicle and the upper surface abuts on the upper member 56. Therefore, the rigidity of the undercover 72 formed by the lower member 74 and the upper member 56 can be improved. However, when the lower member 74 is heated (HE in the figure), the heat applied to the lower member 74 is directly transferred to the upper member 56. Therefore, it becomes difficult to suppress an increase in the internal pressure of the high-pressure tank 20 when the vehicle 12 is heated from the outside of the vehicle. Further, in order to suppress such heat transfer, it is conceivable to form the bead portion 76 so as to project downward from the vehicle (not shown), but the bottom plate 74A projecting downward from the vehicle allows the vehicle 12 to travel. It is necessary to provide the undercover 72 on the upper side of the vehicle so as not to interfere with the above. Therefore, it is necessary to provide the floor panel 24 on the upper side of the vehicle, which may press the space of the vehicle interior 22.

On the other hand, according to the high-pressure tank mounting structure 10 according to the present embodiment, as shown in FIG. 4, an upper member provided on the lower side of the vehicle of the high-pressure tank 20 and forming the bottom wall of the tank accommodating portion 26. An undercover 54 having a lower member 58 arranged below the vehicle and forming a space SP between the upper member 56 and the upper member 56 is arranged. Further, inside the formed space SP, the upper side of the vehicle is adhered to the lower surface of the upper member 56 of the vehicle, and the lower side of the vehicle is adhered to the upper surface of the lower member 58 of the upper member 56. A joining member 66 for joining the lower member 58 and the lower member 58 is arranged. Therefore, the rigidity of the undercover 54 including the upper member 56 and the lower member 58 can be improved. Thereby, for example, it is possible to secure the vibration resistance performance against the vibration generated in the vehicle body during traveling. Further, for example, it is possible to suppress the generation of abnormal noise due to the undercover 54 being deformed and vibrated when traveling on a rough road.

Further, according to the high-pressure tank mounting structure 10 according to the present embodiment, as shown in FIG. 5, the joining member 66 is melted by heating (HE in the drawing). Therefore, for example, when the lower member 58 is heated, the heat applied to the lower member 58 is transferred to the joining member 66, and the joining member 66 melts, so that the upper member 56 and the lower member 58 Will not join. As a result, a heat insulating effect can be generated by the space SP (air layer) formed between the upper member 56 and the lower member 58, and the internal pressure of the high pressure tank 20 when the vehicle 12 is heated from the outside of the vehicle can be generated. The rise can be suppressed.

As described above, the high-pressure tank mounting structure 10 according to the present embodiment secures vibration resistance during vehicle running and suppresses an increase in the internal pressure of the high-pressure tank 20 when the vehicle 12 is heated from the outside of the vehicle. be able to.

(Second Embodiment)
Next, a second embodiment of the high-pressure tank mounting structure 80 according to the present invention will be described with reference to FIG. 7. The same components as those of the above-described first embodiment are designated by the same numbers, and the description thereof will be omitted.

According to the high-pressure tank mounting structure 80 according to the present embodiment, as shown in FIG. 7, a joining member 82 is provided in the vehicle front-rear direction inside the space SP formed between the upper member 56 and the lower member 58. Multiple are arranged along. The thickness (length in the vertical direction of the vehicle) of the joining member 82 is formed to be shorter than the distance between the upper member 56 and the lower member 58 in the vertical direction of the vehicle. Therefore, the adhesive 68 is arranged so as to fill the space between the vehicle upper side of the joining member 66 and the vehicle lower side surface of the upper member 56. Further, the adhesive 68 is arranged so as to fill the space between the vehicle lower side of the joining member 66 and the vehicle lower side surface of the lower member 58. As a result, the upper member 56 and the lower member 58 are joined via the joining member 66.

According to the high-pressure tank mounting structure 80 according to the present embodiment, the joining member 82 is melted by heating. Therefore, for example, when the lower member 58 is heated, the heat applied to the lower member 58 is transferred to the joining member 82, and the joining member 82 melts, so that the upper member 56 and the lower member 58 Will not join. As a result, a heat insulating effect can be generated by the space SP (air layer) formed between the upper member 56 and the lower member 58, and the internal pressure of the high pressure tank 20 when the vehicle 12 is heated from the outside of the vehicle can be generated. The rise can be suppressed.

Although the joining member 66 has been described here as being made of a material that melts at a predetermined temperature, such as rubber or resin, the joining member is not limited to this, and the joining member is, for example, a predetermined soluble alloy or the like. It may be formed of a metal that melts at the temperature of.

Further, here, it has been described that the lower member 58 is formed in a substantially rectangular shape in which the cross section along the vehicle front-rear direction and the vehicle up-down direction is convex toward the vehicle lower side in a side view. The lower member may be formed in a substantially arc shape that is convex toward the lower side of the vehicle.

Further, here, it has been described that the vehicle front side end portion and the vehicle rear side end portion 58A of the lower member 58 are joined to the vehicle lower side surface of the upper member 56, but the present invention is not limited to this. The member may be joined or fastened to a portion other than the upper member of the vehicle body.

10 High-pressure tank mounting structure 12 Fuel cell vehicle (vehicle)
20 High-pressure tank 22 Vehicle interior 24 Floor panel 26 Tank housing 54 Undercover 56 Upper member 58 Lower member 66 Joint member 80 High-pressure tank mounting structure 82 Joint member SP Space HE Heating

Claims (1)

A tank housing section that is provided on the lower side of the vehicle on the floor panel that forms the floor of the passenger compartment and that houses the high-pressure tank.
A space is formed between the plate-shaped upper member provided on the lower side of the vehicle of the high-pressure tank and forming the bottom wall of the tank accommodating portion, and the upper member arranged on the lower side of the vehicle and the upper member. An undercover with a lower member whose lower surface forms part of the bottom surface of the vehicle.
It is arranged inside the space, and the upper end of the vehicle is adhered to the lower surface of the upper member and the lower end of the lower member is adhered to the upper surface of the lower member. As a result, the upper member and the lower member are joined to each other, and the joining member melts by being heated.
High-pressure tank mounting structure equipped with.

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