JP7384754B2 - fuel cell unit - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law On January 28, 2020, Toyota Industries Corporation delivered a fuel cell towing tractor equipped with a fuel cell unit according to the present invention to Chubu Sky Support Co., Ltd. (Tokoname City, Aichi Prefecture). It was delivered to Centrair 1-1.

The present invention relates to a fuel cell unit.

Conventionally, fuel cell vehicles have been equipped with fuel cell stacks. For example, a fuel cell vehicle described in Patent Document 1 is provided with a hydrogen sensor as an electronic component that detects hydrogen leakage.

Japanese Patent Application Publication No. 2011-79347

In a fuel cell unit, a fuel cell stack and electronic components may be mounted in close proximity to each other. When the fuel cell unit vibrates, there is a risk that malfunction may occur due to vibrations from the fuel cell stack being applied to electronic components. Therefore, there is a demand for improving the vibration resistance of electronic components in order to suppress malfunctions of electronic components.

An object of the present invention is to provide a fuel cell unit that can improve the vibration resistance of electronic components.

A fuel cell unit that solves the above problems includes a fuel cell stack, an electronic component, a main frame having a mounting section on which the fuel cell stack is mounted, and a space between the mounting section and the fuel cell stack. a stack mount provided and formed of an elastic member, the main frame including a bracket provided with the electronic component, and a subframe provided at a position facing the fuel cell stack; The bracket is connected to the fuel cell stack and the subframe.

According to this, when vibration is applied to the fuel cell unit, vibration is applied to the electronic components through the fuel cell stack and bracket, but the stack mount alleviates the vibration of the fuel cell stack and also the vibration of the bracket. be done. Therefore, vibrations applied to the electronic components via the fuel cell stack and the bracket can be suppressed. Furthermore, since the bracket is connected to the fuel cell stack and the subframe, vibration of the bracket can be further suppressed, and vibration of the electronic components can be further suppressed. Therefore, the vibration resistance of electronic components can be improved.

In the above fuel cell unit, the electronic component is a hydrogen sensor, the bracket includes a hydrogen cover that collects hydrogen that may rise from below the bracket, and the electronic component is provided on the hydrogen cover. It's good to have one.

According to this, hydrogen captured by the hydrogen cover can be detected by the hydrogen sensor. Therefore, the reliability of the fuel cell unit can be improved.
In the fuel cell unit described above, the fuel cell unit is preferably mounted on a fuel cell vehicle, and the direction in which the fuel cell unit and the subframe face each other is preferably the longitudinal direction of the fuel cell vehicle.

When a fuel cell vehicle accelerates or decelerates, vibrations applied to the fuel cell unit increase.
According to this, since the direction in which the fuel cell stack and the subframe face is the front-rear direction of the fuel cell vehicle, the effect of improving the vibration resistance of the electronic components becomes remarkable.

In the above fuel cell unit, the stack mount includes a first elastic member located toward the front of the fuel cell vehicle, and a second elastic member located toward the rear of the fuel cell vehicle, and It is preferable that the first elastic member and the second elastic member have the same spring constant.

For example, a fuel cell vehicle moves forward at a high rate, and external forces are likely to be input to the fuel cell unit in the longitudinal direction of the fuel cell vehicle. Therefore, when an external force is applied to the fuel cell unit, a moment is generated in the fuel cell stack that causes the center of gravity of the fuel cell stack to rotate toward the subframe using the first elastic member as a fulcrum. Therefore, since stress is more likely to occur in the first elastic member than in the second elastic member, the durability of the first elastic member can be improved by making the spring constant of the first elastic member larger than that of the second elastic member. It is possible to improve the

However, if the spring constant of the first elastic member is larger than the spring constant of the second elastic member, the fuel cell stack is likely to vibrate at the position of the second elastic member, and the vibration of the fuel cell stack may be transmitted through the bracket to electronic components. There is a risk that the information will be transmitted excessively.

In this respect, according to this, since the spring constants of the first elastic member and the second elastic member are equal, compared to the case where the spring constant of the first elastic member is larger than the spring constant of the second elastic member. Therefore, vibration of the fuel cell stack at the position of the second elastic member can be suppressed.

In the above fuel cell unit, a functional component for operating the fuel cell stack may be provided between the fuel cell stack and the subframe.
According to this, since the functional components are located close to the fuel cell stack, it is possible to suppress the increase in size of the fuel cell unit.

In the above fuel cell unit, the bracket includes a first bracket connected to the fuel cell stack and provided with the electronic component, a second bracket connected to the first bracket, and a second bracket connected to the subframe. and a third bracket, and the second bracket and the third bracket may be connected via a buffer member formed of an elastic member.

According to this, vibrations of the first bracket caused by vibrations of the fuel cell stack can be absorbed by the elastic member. Therefore, vibration of the first bracket can be suppressed, and as a result, the vibration resistance of the electronic component can be further improved.

According to this invention, the vibration resistance of electronic components can be improved.

FIG. 3 is a perspective view showing the first wall side of the fuel cell unit. FIG. 3 is a perspective view showing the second wall side of the fuel cell unit. FIG. 3 is a perspective view showing the positions of a fuel cell stack and a subframe. The perspective view which shows a bracket. FIG. 3 is a perspective view showing the back surface of the first bracket. FIG. 3 is a perspective view showing the second bracket. FIG. 7 is a perspective view showing the third bracket. FIG. 3 is a perspective view showing a buffer member. FIG. 3 is an end view showing the arrangement of the fuel cell stack, functional parts, and brackets when viewed from the left and right sides of the vehicle.

An embodiment of a fuel cell unit will be described below with reference to FIGS. 1 to 9.
As shown in FIG. 1, the fuel cell unit 1 is mounted on a fuel cell vehicle 100. Note that the longitudinal direction of the fuel cell vehicle 100 is defined as A, the horizontal direction of the fuel cell vehicle 100 is defined as B, and the direction perpendicular to the longitudinal direction A and also orthogonal to the horizontal direction B is defined as the vertical direction C of the fuel cell vehicle 100.

As shown in FIG. 2, the fuel cell unit 1 includes a fuel cell stack 10, a functional component 20 for operating the fuel cell stack 10, and a housing 30. The fuel cell unit 1 also includes a hydrogen tank 81 in which hydrogen is stored, a hydrogen pipe 82 that connects the hydrogen tank 81 and the functional component 20, a power distribution section 83, and a capacitor 84.

The fuel cell stack 10 is a stack of a plurality of fuel cells. The fuel cell stack 10 generates electricity through an electrochemical reaction between hydrogen as a fuel gas and oxygen in the air as an oxidant gas. The power distribution unit 83 is, for example, an electrical connection unit such as a cable, fuse, or service plug connected to the capacitor 84.

The functional components 20 include a hydrogen circulation pump to which the hydrogen pipe 82 is connected, an injector that supplies hydrogen to the fuel cell stack 10 , a pressure regulating valve that adjusts the pressure of air supplied to the fuel cell stack 10 , and a fuel cell stack 10 This is an air switching valve that switches the supply and discharge of air. The functional component 20 is an auxiliary device for the operation of the fuel cell stack 10.

The fuel cell stack 10, the functional component 20, the hydrogen tank 81, the hydrogen pipe 82, the power distribution section 83, and the capacitor 84 are housed in the housing 30. Note that the hydrogen tank 81, hydrogen piping 82, and power distribution section 83 shown in FIG. 2 can have various shapes, so their detailed shapes are not shown, and only their presence is illustrated by broken lines. The fuel cell unit 1 also includes configurations other than the above-described fuel cell stack 10, functional components 20, casing 30, hydrogen tank 81, hydrogen piping 82, power distribution section 83, and capacitor 84. For convenience, illustrations and detailed explanations are omitted.

As shown in FIGS. 1 and 2, the housing 30 has a rectangular parallelepiped shape. The housing 30 has a first wall 31 , a second wall 32 , a third wall 33 , a fourth wall 34 , a fifth wall 35 , and a sixth wall 36 .

The first wall portion 31 and the second wall portion 32 face each other in the longitudinal direction A of the fuel cell vehicle 100. The first wall portion 31 is located near the front of the fuel cell vehicle 100. The second wall portion 32 is located toward the rear of the fuel cell vehicle 100. The first wall portion 31 and the second wall portion 32 have a rectangular plate shape. The longitudinal direction of the first wall portion 31 and the longitudinal direction of the second wall portion 32 coincide with the left-right direction B of the fuel cell vehicle 100. The lateral direction of the first wall portion 31 and the lateral direction of the second wall portion 32 coincide with the vertical direction C of the fuel cell vehicle 100.

The third wall portion 33 and the fourth wall portion 34 face each other in the left-right direction B of the fuel cell vehicle 100. The third wall portion 33 is located on the left side of the fuel cell vehicle 100. The fourth wall portion 34 is located on the right side of the fuel cell vehicle 100. The third wall portion 33 and the fourth wall portion 34 have a rectangular plate shape. The longitudinal direction of the third wall section 33 and the longitudinal direction of the fourth wall section 34 coincide with the longitudinal direction A of the fuel cell vehicle 100. The lateral direction of the third wall 33 and the lateral direction of the fourth wall 34 coincide with the vertical direction C of the fuel cell vehicle 100. Both short edges of the third wall 33 connect the first short edge of the first wall 31 and the first short edge of the second wall 32 . Both short edges of the fourth wall 34 connect the second short edge of the first wall 31 and the second short edge of the second wall 32 .

The fifth wall portion 35 and the sixth wall portion 36 face each other in the vertical direction C of the fuel cell vehicle 100. The fifth wall portion 35 is located above the fuel cell vehicle 100. The sixth wall portion 36 is located toward the bottom of the fuel cell vehicle 100. The fifth wall portion 35 and the sixth wall portion 36 have a rectangular plate shape. The longitudinal direction of the fifth wall portion 35 and the longitudinal direction of the sixth wall portion 36 coincide with the left-right direction B of the fuel cell vehicle 100. The lateral direction of the fifth wall portion 35 and the lateral direction of the sixth wall portion 36 coincide with the longitudinal direction A of the fuel cell vehicle 100. Both short edges of the fifth wall 35 connect the first long edge of the third wall 33 and the first long edge of the fourth wall 34 . Both long edges of the fifth wall 35 connect the first long edge of the first wall 31 and the first long edge of the second wall 32 . Both short edges of the sixth wall 36 connect the second long edge of the third wall 33 and the second long edge of the fourth wall 34 . Both long edges of the sixth wall 36 connect the second long edge of the first wall 31 and the second long edge of the second wall 32 .

As shown in FIG. 1, the fourth wall portion 34 is formed with a first discharge port 34b (indicated by a broken line in FIG. 1) that penetrates the fourth wall portion 34 in the thickness direction. The first discharge port 34b communicates the inside and outside of the housing 30. A second outlet 34c (indicated by a broken line in FIG. 1) is formed in the fourth wall 34 and extends through the fourth wall 34 in the thickness direction. The second discharge port 34c is formed below the first discharge port 34b. The second discharge port 34c communicates the inside and outside of the housing 30.

The fourth wall portion 34 is provided with a first fan 85 and a second fan 86. The first fan 85 has a larger output than the second fan 86. Therefore, the first fan 85 is the main fan, and the second fan 86 is the sub fan. The first fan 85 and the second fan 86 are provided on the wall surface 34a of the fourth wall portion 34. The wall surface 34a is a surface of the fourth wall portion 34 that faces the outside of the housing 30. The first fan 85 is arranged on the wall surface 34a so as to cover the first exhaust port 34b. The second fan 86 is arranged on the wall surface 34a so as to cover the second exhaust port 34c. Note that the first fan 85 may be disposed on the wall surface of the fourth wall section 34 opposite to the wall surface 34a so as to cover the first discharge port 34b, and the second fan 86 may be disposed on the wall surface opposite to the wall surface 34a so as to cover the first discharge port 34b. You may arrange|position on the wall surface of the 4th wall part 34 on the opposite side to the wall surface 34a so that it may cover. That is, the first fan 85 and the second fan 86 may be disposed on the fourth wall portion 34 side so as to cover the first exhaust port 34b and the second exhaust port 34c.

A virtual line extending in the vertical direction C along the wall surface 34a while passing through the center O1 of the wall surface 34a is referred to as a first virtual line L1, and a virtual line extending in the front-rear direction A along the wall surface 34a while passing through the center O1 of the wall surface 34a is referred to as a first virtual line L1. 2 virtual line L2.

The first exhaust port 34b and the first fan 85 are located near the second wall portion 32 and in the fifth wall of the four regions of the wall surface 34a defined by the first imaginary line L1 and the second imaginary line L2. It is arranged in a region closer to the section 35. The second outlet 34c and the second fan 86 are located near the second wall portion 32 and in the sixth wall of the four regions of the wall surface 34a defined by the first imaginary line L1 and the second imaginary line L2. It is arranged in a region closer to the section 36.

The first wall 31 is provided with an opening 31 a that is recessed from the first long edge of the first wall 31 toward the sixth wall 36 . The opening 31a opens toward the fifth wall 35. The opening 31a penetrates the first wall 31 in the thickness direction. A portion of the capacitor 84 is accommodated in the opening 31a. One side of the capacitor 84 is exposed to the outside of the casing 30 and constitutes a part of the wall surface 31b of the first wall portion 31. The wall surface 31b is a surface of the first wall portion 31 that faces the outside of the casing 30.

As shown in FIG. 2, the third wall portion 33 is provided with a plurality of vent holes 87. The plurality of vent holes 87 penetrate the third wall portion 33 in the thickness direction. The plurality of vent holes 87 communicate the inside and outside of the housing 30. The surface of the third wall portion 33 facing the outside of the housing 30 is defined as a wall surface 33a. A virtual line extending in the vertical direction C along the wall surface 33a while passing through the center O2 of the wall surface 33a is defined as a third virtual line L3. The plurality of ventilation holes 87 are provided in the entire area near the second wall portion 32 of the two regions of the wall surface 33a divided by the third imaginary line L3. The plurality of vent holes 87 are aligned in the up-down direction C and the front-back direction A, respectively.

A supply nozzle 88 is provided in the third wall portion 33 . The supply nozzle 88 is provided in a region of the third wall portion 33 closer to the first wall portion 31 of two regions of the wall surface 33a partitioned by the third imaginary line L3. The supply nozzle 88 is a supply port for supplying hydrogen from an external hydrogen supply device to the hydrogen tank 81 housed in the housing 30 . The supply nozzle 88 is connected to the hydrogen tank 81 through a supply pipe 89 . A connecting portion 90 for storing hydrogen supplied from the supply pipe 89 in the hydrogen tank 81 is provided in a portion of the hydrogen tank 81 facing the third wall portion 33 . Supply piping 89 is housed inside the housing 30 .

As shown in FIGS. 1 and 2, the fifth wall portion 35 is provided with an intake port 35a. The intake port 35a is arranged at the center of the fifth wall portion 35. The intake port 35a penetrates the fifth wall portion 35 in the thickness direction. The intake port 35a communicates the inside and outside of the housing 30. The intake port 35a is provided to take air into the housing 30. A filter member 91 is provided on the fifth wall portion 35 . The filter member 91 is arranged at the center of the fifth wall portion 35 . The filter member 91 has a box shape. The filter member 91 is arranged to cover the air intake port 35a provided in the fifth wall portion 35. In the filter member 91, a plurality of through holes 91a are formed in a portion facing the fifth wall portion 35 in the vertical direction C. The through hole 91a is covered with a filter (not shown). The filter collects foreign matter such as dirt and dust when taking in air from outside the casing 30 . It should be noted that, for example, wind from the running of the fuel cell vehicle 100 is taken in from the intake port 35a.

As shown in FIG. 3, the casing includes a first wall 31, a second wall 32, a third wall 33, a fourth wall 34, a fifth wall 35, and a sixth wall 36. The main frame 40 is a skeletal member. The main frame 40 has a plurality of partition walls to partition the inside of the casing 30 into a plurality of partitions. The space defined by the partition wall of the main frame 40 accommodates the above-described fuel cell stack 10, functional component 20, hydrogen tank 81, power distribution section 83, and the like. Note that the main frame 40 can have various shapes for partitioning the inside of the casing 30 into a plurality of sections. Therefore, in this embodiment, only some of the plurality of partition walls of the main frame 40 are shown and explained in FIGS. 3, 4, and 8, and a general description of the structure of the main frame 40 is omitted.

As shown in FIGS. 2 and 3, the main frame 40 has a flat first frame 41. As shown in FIGS. The first frame 41 has a rectangular plate shape. The longitudinal direction of the first frame 41 corresponds to the left-right direction B of the fuel cell vehicle 100. The lateral direction of the first frame 41 corresponds to the longitudinal direction A of the fuel cell vehicle 100.

As shown in FIG. 2, the first frame 41 is disposed inside the housing 30 closer to the second wall 32 and between the fifth wall 35 and the sixth wall 36. . The fuel cell stack 10 is placed on a wall surface 41 a of the first frame 41 that faces the fifth wall portion 35 . Note that the first frame 41 is a mounting section on which the fuel cell stack 10 is mounted.

As shown in FIG. 3, three stack mounts 50 made of elastic members are arranged on the wall surface 41a of the first frame 41. As shown in FIG. The three stack mounts 50 are respectively referred to as a first stack mount 51, a second stack mount 52, and a third stack mount 53. The first stack mount 51, the second stack mount 52, and the third stack mount 53 are disk-shaped. The fuel cell stack 10 is mounted on the first stack mount 51, the second stack mount 52, and the third stack mount 53. The first stack mount 51 , the second stack mount 52 , and the third stack mount 53 are provided between the first frame 41 and the fuel cell stack 10 .

Here, in the fuel cell stack 10, the end surface facing the wall surface 41a is referred to as a first end surface 10a. The first stack mount 51 and the second stack mount 52 are mounted at two corners of the first end surface 10a of the fuel cell stack 10 located closer to the front of the fuel cell vehicle 100, respectively. The first stack mount 51 is arranged closer to the left of the fuel cell vehicle 100 than the second stack mount 52 is. On the third stack mount 53, the center of the long edge of the first end surface 10a of the fuel cell stack 10 located toward the rear of the fuel cell vehicle 100 is placed. That is, the first stack mount 51, the second stack mount 52, and the third stack mount 53 have a triangular line connecting the first stack mount 51, the second stack mount 52, and the third stack mount 53 on the wall surface 41a. The fuel cell stack 10 is supported at a position where the shape is formed.

The third stack mount 53 has a two-layer structure. The third stack mount 53 includes a disk-shaped base portion 53a and a disk-shaped rubber sheet 53b laminated on the upper surface of the base portion 53a.

Here, the spring constant of the first stack mount 51 is K1, the spring constant of the second stack mount 52 is K2, the spring constant of the base portion 53a is K3, and the spring constant of the rubber sheet 53b is K4. In this embodiment, the spring constants K1, K2, K3, and K4 are set so as to have the relationship shown in Equation 1 below.

K1+K2=K3・K4/(K3+K4)...(Formula 1)
The first stack mount 51 and the second stack mount 52 located near the front of the fuel cell vehicle 100 are examples of first elastic members, and the third stack mount 53 located near the rear of the fuel cell vehicle 100 is an example of a first elastic member. This is an example of two elastic members. Therefore, Equation 1 above indicates that the spring constant of the first elastic member and the spring constant of the second elastic member are equal. Note that the spring constants K1, K2, K3, and K4 are set to be large enough to sufficiently absorb vibrations applied to the fuel cell stack 10.

Further, the functional component 20 is also placed on the wall surface 41a of the first frame 41. Functional component 20 is arranged adjacent to fuel cell stack 10 . Functional component 20 is arranged closer to the front of fuel cell vehicle 100 than fuel cell stack 10 .

As shown in FIGS. 2 and 3, the main frame 40 has a second frame 42. As shown in FIGS. The second frame 42 is arranged inside the housing 30 closer to the first wall 31 than the first frame 41, and between the fifth wall 35 and the sixth wall. The second frame 42 is arranged closer to the fifth wall portion 35 than the first frame 41 is.

The second frame 42 has a flat mounting wall 42a and a flat partition wall 42b. The mounting wall 42a has a rectangular plate shape. The longitudinal direction of the mounting wall 42a corresponds to the left-right direction B of the fuel cell vehicle 100. The lateral direction of the mounting wall 42a corresponds to the longitudinal direction A of the fuel cell vehicle 100. A power distribution section 83 is mounted on the mounting wall 42a.

The partition wall 42b has a rectangular plate shape. The longitudinal direction of the partition wall 42b corresponds to the left-right direction B of the fuel cell vehicle 100. The lateral direction of the partition wall 42b corresponds to the vertical direction C of the fuel cell vehicle 100. The mounting wall 42a and the partition wall 42b are continuous so that the cross section has an L-shape. The partition wall 42b is continuous with the long edge located toward the rear of the fuel cell vehicle 100 among both long edges of the mounting wall 42a. The partition wall 42b extends from the mounting wall 42a toward the fifth wall portion 35. Partition wall 42b extends upward of fuel cell vehicle 100. The long edge of the partition wall 42b on the opposite side from the placement wall 42a does not contact the fifth wall portion 35. A part of the long edge of the partition wall 42b on the side opposite to the placement wall 42a faces the air intake port 35a of the fifth wall portion 35. The partition wall 42b is provided at a position facing the fuel cell stack 10 in the longitudinal direction A of the fuel cell vehicle 100. The direction in which the fuel cell stack 10 and the partition wall 42b face is the longitudinal direction A of the fuel cell vehicle 100. Note that the partition wall 42b is an example of a subframe.

As shown in FIG. 2, the inside of the housing 30 is partitioned into a plurality of sections by the first frame 41 and the second frame 42. In this embodiment, the first frame 41 and the second frame 42 divide the inside of the housing 30 into at least a first section P1, a second section P2, and a third section P3.

The first section P1 is divided by a second wall 32, a third wall 33, a fourth wall 34, a fifth wall 35, a first frame 41, and a partition wall 42b. A fuel cell stack 10 and a functional component 20 are housed in the first section P1. Functional component 20 is provided between fuel cell stack 10 and partition wall 42b. A portion of the plurality of vent holes 87 formed in the third wall portion 33 and the first discharge port 34b shown in FIG. 1 are in communication with the first section P1.

The second section P2 is divided by the first wall 31, the third wall 33, the fourth wall 34, the fifth wall 35, the capacitor 84, the mounting wall 42a, and the partition wall 42b. The second section P2 is arranged adjacent to the first section P1. The second section P2 is located closer to the front of the fuel cell vehicle 100 than the first section P1. A power distribution unit 83 is accommodated in the second section P2.

The third section P3 is divided by the first wall 31, the second wall 32, the third wall 33, the fourth wall 34, the sixth wall 36, the first frame 41, and the mounting wall 42a. There is. The third section P3 is located below the first section P1 and the second section P2. A hydrogen tank 81 is accommodated below the mounting wall 42a in the third section P3. Since the second frame 42 is arranged closer to the fifth wall 35 than the first frame 41, the first section P1 and the third section P3 are formed between the first frame 41 and the second frame 42. They communicate through a gap S. The hydrogen pipe 82 extends from the third section P3 to the first section P1 via the gap S, and is connected to the hydrogen circulation pump of the functional components 20. A portion of the third section P3 located below the first frame 41 communicates with a portion of the plurality of ventilation holes 87 formed in the third wall portion 33 and the second discharge port 34c shown in FIG. are doing. Furthermore, a discharge resistor (not shown) and the like are accommodated in a portion of the third section P3 located below the first frame 41.

The first section P1 and the second section P2 communicate with each other via a gap between the partition wall 42b and the fifth wall 35. Further, the first section P1 and the second section P2 communicate with the intake port 35a of the fifth wall portion 35. Therefore, the air sucked in from the plurality of vents 87 and the intake ports 35a by the power of the first fan 85 and the second fan 86 passes through the first section P1, the second section P2, and the third section P3, and It is discharged from the first discharge port 34b and the second discharge port 34c. Therefore, the fuel cell stack 10, the power distribution section 83, a discharge resistor (not shown), etc. are cooled.

As shown in FIG. 4, the fuel cell unit 1 includes a hydrogen detector 60 as an electronic component and a bracket 70 on which the hydrogen detector 60 is provided. The hydrogen detector 60 and the bracket 70 are housed in the first section P1.

Here, in the fuel cell stack 10, the end surface facing the fifth wall portion 35 is referred to as the second end surface 10b. The bracket 70 is connected to a long edge of the second end surface 10b of the fuel cell stack 10 located closer to the partition wall 42b and a wall surface 42c of the partition wall 42b facing the fuel cell stack 10. Bracket 70 is connected to fuel cell stack 10 and partition wall 42b. Bracket 70 is located above functional component 20. The bracket 70 is arranged to cover the functional component 20.

The bracket 70 includes a first bracket 71, two second brackets 72, a third bracket 73, and a buffer member 74 made of an elastic member.
As shown in FIG. 5, the first bracket 71 includes a rectangular plate-shaped main body 71a, a plate-shaped mounting plate 71b extending from a first long edge of the main body 71a, and a second long edge of the main body 71a. It has a plate-shaped overhang part 71c extending from.

The mounting plate portion 71b is provided in a predetermined range at the center of the first long edge of the main body portion 71a. The mounting plate portion 71b has a first extending portion 71d, a second extending portion 71e, and a third extending portion 71f.

The first extending portion 71d has a rectangular plate shape. The first long edge of the first extending portion 71d is connected to a predetermined range of the central portion of the first long edge of the main body portion 71a. The first extending portion 71d extends from the main body portion 71a in the thickness direction of the main body portion 71a without being bent.

The second extending portion 71e has a rectangular plate shape. The first long edge of the second extending portion 71e is continuous with the second long edge of the first extending portion 71d. The second extending portion 71e is bent from the second long edge of the first extending portion 71d so as to be spaced apart from the wall surface 711 of the main body portion 71a.

The third extending portion 71f has a rectangular plate shape. The first long edge of the third extending portion 71f is continuous with the second long edge of the second extending portion 71e. The third extending portion 71f extends in a bent manner from the second long edge of the second extending portion 71e. The third extending portion 71f extends from the second long edge of the second extending portion 71e in parallel to the first extending portion 71d. Two through holes 71g are formed in the third extending portion 71f. The two through holes 71g penetrate the third extending portion 71f in the thickness direction. The two through holes 71g are symmetrically arranged near both short edges of the third extending portion 71f in the longitudinal direction of the third extending portion 71f. The mounting plate portion 71b configured in this manner is bent twice as it moves away from the main body portion 71a.

The projecting portion 71c is provided in a predetermined range at the center of the second long edge of the main body portion 71a. The projecting portion 71c is arranged at the same position as the mounting plate portion 71b in the longitudinal direction of the main body portion 71a. The projecting portion 71c is arranged at a position symmetrical to the mounting plate portion 71b in the lateral direction of the main body portion 71a. The projecting portion 71c has a rectangular plate shape. The first long edge of the projecting portion 71c is connected to a predetermined range of the central portion of the second long edge of the main body portion 71a. The projecting portion 71c extends from the main body portion 71a in the thickness direction of the main body portion 71a without being bent. A through hole 71h is formed in the projecting portion 71c. The through hole 71h penetrates the overhang portion 71c in the thickness direction.

The first bracket 71 has a frame portion 71i. The frame portion 71i protrudes from the outer edges of the main body portion 71a and the overhang portion 71c so as to be spaced apart from the wall surface 711 of the main body portion 71a, except for the portion where the mounting plate portion 71b is connected. The frame portion 71i protrudes in the same direction as the direction in which the second extending portion 71e protrudes from the first extending portion 71d in the thickness direction of the main body portion 71a. In the first bracket 71, most of the wall surface 711 is surrounded by the frame portion 71i, and a portion connected to the mounting plate portion 71b is open.

As shown in FIG. 4, the first bracket 71 is arranged above the functional component 20. The first bracket 71 is arranged to cover the functional component 20. The first bracket 71 is arranged so that the space surrounded by the frame portion 71i and the main body portion 71a faces the functional component 20. The mounting plate portion 71b of the first bracket 71 is connected to the long edge of the second end surface 10b of the fuel cell stack 10 located closer to the partition wall 42b by a bolt 92. The bolts 92 are inserted into each of the two through holes 71g of the mounting plate portion 71b, and are screwed into the second end surface 10b of the fuel cell stack 10. The first bracket 71 is connected to the fuel cell stack 10. The hydrogen detector 60 is placed on the protruding portion 71c of the first bracket 71. The hydrogen detector 60 is arranged so as to cover the through hole 71h of the projecting portion 71c.

The functional components 20 include auxiliary equipment through which hydrogen passes, such as a hydrogen circulation pump and an injector. Therefore, if hydrogen were to leak from the functional component 20, the hydrogen could rise upward from the functional component 20. The rising hydrogen is collected in a space surrounded by the frame portion 71i and the main body portion 71a of the first bracket 71. The hydrogen collected by the first bracket 71 reaches the hydrogen detector 60 through the through hole 71h and is detected by the hydrogen detector 60. Therefore, the bracket 70 includes a first bracket 71 that is a hydrogen cover that collects hydrogen that may rise from below the bracket 70, and the hydrogen detector 60 is a hydrogen sensor that detects hydrogen.

The two second brackets 72 are connected to each of the frame portions 71i extending from both short edges of the overhanging portion 71c of the first bracket 71 by a connecting means such as an adhesive or a bolt. The connection means may be changed as appropriate.

As shown in FIG. 6, the second bracket 72 includes a first plate portion 72a having a rectangular plate shape and a second plate portion 72b having a rectangular plate shape. The first plate portion 72a and the second plate portion 72b are continuous so that their cross sections form an L-shape. The first plate portion 72a extends in the thickness direction of the second plate portion 72b.

A notch groove 72c is formed in the second plate portion 72b. The notch groove 72c penetrates the second plate portion 72b in the thickness direction. The notch groove 72c opens at an edge of the second plate portion 72b located on the opposite side from the first plate portion 72a. The notch groove 72c is recessed from the edge of the second plate portion 72b opposite to the first plate portion 72a to the center of the second plate portion 72b.

As shown in FIG. 4, in the two second brackets 72, a part of the end surface 72d of the first plate part 72a of the second bracket 72 on the opposite side to the second plate part 72b is located at both short edges of the overhang part 71c. They are arranged so as to be connected to the respective frame portions 71i protruding from the respective frames. The notch groove 72c of the second plate portion 72b of one second bracket 72 opens toward the left side of the fuel cell vehicle 100, and the notch groove 72c of the second plate portion 72b of the other second bracket 72 opens toward the left side of the fuel cell vehicle 100. , which opens toward the right of the fuel cell vehicle 100.

As shown in FIG. 7, the third bracket 73 includes a rectangular plate-shaped connecting portion 73a, a first connecting portion 73b that is continuous with a first short edge of the connecting portion 73a, and a second short edge of the connecting portion 73a. A second connecting portion 73c continuous to the edge.

The first connecting portion 73b includes a first plate portion 731b shaped like a rectangular plate and a second plate portion 732b shaped like a rectangular plate. The first short edge of the connecting portion 73a is continuous with the center portion of the first long edge of the first plate portion 731b. A through hole 733b is formed in the first plate portion 731b. The through hole 733b passes through the first plate portion 731b in the thickness direction. Note that a female thread groove is formed on the inner peripheral surface of the through hole 733b.

The second plate portion 732b is integrally formed with the first plate portion 731b. The second plate part 732b extends from the edge of the first plate part 731b in the thickness direction of the first plate part 731b so as to form an L-shaped cross section together with the first plate part 731b.

The second connecting portion 73c has a shape that is symmetrical to the first connecting portion 73b with respect to the connecting portion 73a. The second connecting portion 73c includes a first plate portion 731c shaped like a rectangular plate and a second plate portion 732c shaped like a rectangular plate. The second short edge of the connecting portion 73a is continuous with the center portion of the first long edge of the first plate portion 731c. A through hole 733c is formed in the first plate portion 731c. The through hole 733c passes through the first plate portion 731c in the thickness direction. Note that a female thread groove is formed on the inner peripheral surface of the through hole 733c.

The second plate portion 732c is integrally formed with the first plate portion 731c. The second plate part 732c extends from the edge of the first plate part 731c in the thickness direction of the first plate part 731c so as to form an L-shaped cross section together with the first plate part 731c.

As shown in FIG. 4, in the third bracket 73, the second plate part 732b of the first connecting part 73b and the second plate part 732c of the second connecting part 73c are attached to the wall surface 42c of the partition wall 42b with adhesive or bolts, for example. They are arranged so as to be connected by connection means such as. The connection means may be changed as appropriate. Each of the first plate portions 731b and 731c is located below each of the second plate portions 72b of the second bracket 72.

As shown in FIG. 8, the buffer member 74 includes a cylindrical shaft portion 74a, a disc-shaped first holding portion 74b provided at a first end of the shaft portion 74a, and a second end of the shaft portion 74a. A disc-shaped second holding part 74c is provided. The shaft portion 74a, the first clamping portion 74b, and the second clamping portion 74c are arranged coaxially. A first through hole 741b communicating with the inside of the shaft portion 74a is formed in the first holding portion 74b. A second through hole 741c communicating with the inside of the shaft portion 74a is formed in the second holding portion 74c. The first through hole 741b, the second through hole 741c, and the inner peripheral surface 741a of the shaft portion 74a are all continuous and form a cylindrical surface. That is, the through hole 745 is formed by the first through hole 741b, the second through hole 741c, and the inner peripheral surface 741a of the shaft portion 74a.

As shown in FIGS. 4 and 8, the first holding part 74b of the buffer member 74 is placed on the first plate parts 731b and 731c. The through hole 745 of the buffer member 74 is arranged to communicate with the through holes 733b and 733c formed in the first plate parts 731b and 731c, respectively. The shaft portion 74a of the buffer member 74 is fitted into the notch groove 72c of the second plate portion 72b. The second holding part 74c of the buffer member 74 is placed on the second plate part 72b. That is, the first clamping part 74b and the second clamping part 74c sandwich the second plate part 72b. With the second plate part 72b being sandwiched between the first clamping part 74b and the second clamping part 74c, the bolt 75 is inserted into the through hole 745 of the buffer member 74, and the through hole 733b of the first plate part 731b, 731c is inserted. , 733c. That is, the second bracket 72 and the third bracket 73 are connected via the buffer member 74.

The operation of this embodiment will be explained.
As shown in FIG. 9, for example, the fuel cell vehicle 100 moves forward at a high rate, and external force is likely to be input to the fuel cell unit 1 in the longitudinal direction A of the fuel cell vehicle 100. Therefore, when an external force is applied to the fuel cell unit 1, the center of gravity of the fuel cell stack 10 rotates toward the partition wall 42b using the first stack mount 51 and the second stack mount 52 as fulcrums. A moment occurs. Due to this moment, vibration occurs in the fuel cell stack 10 in the vertical direction C of the fuel cell vehicle 100 at the position of the third stack mount 53, and the bracket disposed near the front of the fuel cell vehicle 100 of the fuel cell stack 10 At 70, vibration occurs in the longitudinal direction A of the fuel cell vehicle 100.

In this embodiment, when vibration is applied to the fuel cell unit 1, vibration is applied to the hydrogen detector 60 via the fuel cell stack 10 and the bracket 70, but the vibration of the fuel cell stack 10 is alleviated by the stack mount 50. , vibration of the bracket 70 is also alleviated. Therefore, vibrations applied to the hydrogen detector 60 via the fuel cell stack 10 and the bracket 70 are suppressed. Further, since the bracket 70 is connected to the fuel cell stack 10 and the partition wall 42b, the vibration of the bracket 70 can be further suppressed, and the vibration of the hydrogen detector 60 can be further suppressed.

The effects of this embodiment will be explained.
(1) The vibration of the fuel cell stack 10 is alleviated by the stack mount 50, and the vibration of the bracket 70 is also alleviated, so that vibrations applied to the hydrogen detector 60 via the fuel cell stack 10 and the bracket 70 can be suppressed. Further, since the bracket 70 is connected to the fuel cell stack 10 and the partition wall 42b, the vibration of the bracket 70 can be further suppressed, and the vibration of the hydrogen detector 60 can be further suppressed. Therefore, the vibration resistance of the hydrogen detector 60 can be improved.

(2) Hydrogen collected by the first bracket 71 can be detected by the hydrogen detector 60. Therefore, the reliability of the fuel cell unit 1 can be improved.
(3) When fuel cell vehicle 100 accelerates or decelerates, vibrations applied to fuel cell unit 1 increase.

In this embodiment, since the direction in which the fuel cell stack 10 and the partition wall 42b face is the longitudinal direction A of the fuel cell vehicle 100, the effect of improving the vibration resistance of the hydrogen detector 60 is significant.

(4) When a moment is generated in the fuel cell stack 10 that rotates the first stack mount 51 and the second stack mount 52 toward the partition wall 42b using the first stack mount 51 and the second stack mount 52 as fulcrums, the first stack mount 51 and the second stack mount 52 , stress is more likely to occur than in the third stack mount 53.

The spring constants of the first stack mount 51 and the second stack mount 52 are made equal to the spring constant of the third stack mount 53. Therefore, compared to the case where the spring constants of the first stack mount 51 and the second stack mount 52 are larger than the spring constant of the third stack mount 53, the vibration of the fuel cell stack 10 at the position of the third stack mount 53 is reduced. It can be suppressed.

(5) Since the functional component 20 is located close to the fuel cell stack 10, it is possible to suppress the increase in the size of the fuel cell unit 1.
(6) The vibration of the first bracket 71 caused by the vibration of the fuel cell stack 10 can be absorbed by the buffer member 74. Therefore, vibration of the first bracket 71 can be suppressed, and as a result, the vibration resistance of the hydrogen detector 60 can be further improved.

(7) Since the spring constants of the first stack mount 51 and the second stack mount 52 are made equal to the spring constant of the third stack mount 53, vibration of the fuel cell stack 10 at the position of the third stack mount 53 can be suppressed; Transmission of vibrations from the fuel cell stack 10 to the functional components 20 can also be suppressed.

Note that this embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
○ The shapes of the first bracket 71, the second bracket 72, and the third bracket 73 may be changed as appropriate.

The second bracket 72 and the third bracket 73 may be connected without using the buffer member 74.
○ The second bracket 72 and the buffer member 74 may be omitted, and the bracket 70 may be composed of the first bracket 71 and the third bracket 73. When changing in this way, the first bracket 71 and the third bracket 73 are connected.

○ The bracket 70 may be composed of only the first bracket 71. In this case, the projecting portion 71c of the first bracket 71 is changed to be connected to the partition wall 42b.
- The functional component 20 does not have to be arranged adjacent to the fuel cell stack 10. For example, the functional component 20 may be accommodated below the first frame 41 in the third section P3.

The first bracket 71 is not limited to having a function as a hydrogen cover. Instead of the hydrogen detector 60, the first bracket 71 may be provided with an electronic component such as a sensor that measures the current flowing through the power distribution section 83 or a sensor that measures the voltage. The electronic components provided on the first bracket 71 may be changed as appropriate.

- The second stack mount 52 may be omitted and the first stack mount 51 may be used as the first elastic member. The first stack mount 51 may be omitted and the second stack mount 52 may be used as the first elastic member. Alternatively, a fourth stack mount may be added to the first stack mount 51 and the second stack mount 52 to form the first elastic member. Similarly, a fifth stack mount may be added in addition to the third stack mount 53 to form the second elastic member. That is, the number of mounts that constitute the first elastic member and the second elastic member may be changed as appropriate. However, the number of mounts is changed so that the spring constants of the first elastic member and the second elastic member can sufficiently absorb vibrations applied to the fuel cell stack 10.

Although the third stack mount 53 had the rubber sheet 53b, it may be omitted. In that case, the spring constants K1, K2, and K3 are adjusted so that K1+K2=K3 (Formula 2).

○ Although the first stack mount 51, the second stack mount 52, and the third stack mount 53 are adopted as the stack mount 50, for example, the gap between the first end surface 10a of the fuel cell stack 10 and the first frame 41 The stack mount 50 may be a flat rubber sheet placed over the entire area.

When the fuel cell unit 1 is mounted on the fuel cell vehicle 100, the direction in which the fuel cell stack 10 faces the partition wall 42b may be the left-right direction B of the fuel cell vehicle 100. That is, when the fuel cell unit 1 is mounted on the fuel cell vehicle 100, the direction in which the fuel cell stack 10 and the partition wall 42b face each other may be any direction other than the vertical direction C of the fuel cell vehicle 100.

The fuel cell unit 1 is not limited to being mounted on the fuel cell vehicle 100, and the application may be changed as appropriate.

DESCRIPTION OF SYMBOLS 1... Fuel cell unit, 10... Fuel cell stack, 20... Functional component, 40... Main frame, 41... First frame, 42... Second frame, 42b... Partition wall, 50... Stack mount, 51... First stack mount , 52... second stack mount, 53... third stack mount, 60... hydrogen detector, 70... bracket, 71... first bracket, 72... second bracket, 73... third bracket, 74... buffer member, 100... fuel Battery vehicle, A...front and back direction, B...left and right direction, C...up and down direction, K1, K2, K3, K4...spring constant.

Claims (6)

fuel cell stack,
electronic parts and
a main frame having a mounting section on which the fuel cell stack is mounted;
A fuel cell unit comprising a stack mount provided between the mounting portion and the fuel cell stack and formed of an elastic member,
comprising a bracket on which the electronic component is installed;
The main frame has a subframe provided at a position facing the fuel cell stack,
A fuel cell unit, wherein the bracket is connected to the fuel cell stack and the subframe. The electronic component is a hydrogen sensor,
The bracket includes a hydrogen cover that collects hydrogen that may rise from below the bracket,
The fuel cell unit according to claim 1, wherein the electronic component is provided on the hydrogen cover. The fuel cell unit is mounted on a fuel cell vehicle,
3. The fuel cell unit according to claim 1, wherein a direction in which the fuel cell unit and the subframe face each other is a longitudinal direction of the fuel cell vehicle. The stack mount is
a first elastic member located near the front of the fuel cell vehicle;
a second elastic member located toward the rear of the fuel cell vehicle;
4. The fuel cell unit according to claim 3, wherein the first elastic member and the second elastic member have the same spring constant. The fuel cell according to any one of claims 1 to 4, wherein a functional component for operating the fuel cell stack is provided between the fuel cell stack and the subframe. unit. The bracket is
a first bracket connected to the fuel cell stack and provided with the electronic component;
a second bracket connected to the first bracket;
a third bracket connected to the subframe;
6. The fuel cell unit according to claim 1, wherein the second bracket and the third bracket are connected via a buffer member formed of an elastic member.