Fuel tank fixing device

Abstract

To provide a fuel tank fixing device capable of appropriately fixing a fuel tank to an object to be mounted.SOLUTION: A fuel tank fixing device includes: a moving member 70; an elastic member 62 provided at the moving member 70; an adjustment mechanism 90 which includes a bolt 63 and can adjust a moving amount of the moving member 70; and a frame 50 where an insertion hole 52 through which the bolt 63 is inserted formed. The moving member 70 has a recessed part 73 that defines an insertion hole H73 in which an end surface 63d of the bolt 63 is inserted and includes a bottom surface 73a with which the end surface 63b can come into contact. An adjustment mechanism 90 brings the moving member 70 close to the fuel tank with the bolt 63 and presses the elastic member 62 against the fuel tank to fix the fuel tank to a mounting object on which a fuel battery is mounted. The recessed part 73 has a guide surface 73c extending to a central axis m of the insertion hole as it goes to the bottom surface 73a from an entrance 73d of the insertion hole.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fuel tank fixing device. [Background technology]

[0002] The fuel tank fixing device includes a moving member, an elastic member, an adjustment mechanism, and a frame. The moving member is capable of moving toward and away from a fuel tank that stores fuel gas used in the fuel cell. The elastic member is provided on the moving member so as to face the fuel tank. The adjustment mechanism includes a columnar adjustment member. The adjustment mechanism is capable of adjusting the amount of movement of the moving member. The frame is provided at a position facing the fuel tank. An insertion hole is formed in the frame at a position facing the moving member. The adjustment member is inserted into the insertion hole.

[0003] The movable member defines an insertion hole into which the tip surface of the adjustment member is inserted, and has a recessed portion including a bottom surface against which the tip surface of the adjustment member can abut. The adjustment mechanism brings the movable member close to the fuel tank using the adjustment member, and presses the elastic member against the fuel tank, thereby fixing the fuel tank to the mounting object on which the fuel cell is mounted.

[0004] For example, in the fuel tank fixing device described in Patent Document 1, an adjustment bolt serving as an adjustment member is screwed into a threaded hole serving as an insertion hole formed in a frame. The tip surface of the adjustment bolt is inserted into a recess formed in a moving member. Then, as the adjustment bolt rotates, the moving member is pushed toward the fuel tank together with a rubber plate serving as an elastic member. The adjustment bolt and the threaded hole serving as an adjustment mechanism press the rubber plate against the fuel tank. Thus, the fuel tank is fixed to the vehicle on which it is to be mounted. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-40478 Summary of the Invention [Problem to be solved by the invention]

[0006] Depending on the orientation of the movable member relative to the fuel tank, the recessed portion of the movable member may be misaligned with the insertion hole formed in the frame. In this case, the tip end surface of the adjustment member may abut against the movable member without being inserted into the recessed portion of the movable member. As a result, when the adjustment member presses the movable member and the elastic member toward the fuel tank, the force of the adjustment member pressing the movable member is not sufficiently transmitted to the elastic member. This may result in the elastic member not being pressed sufficiently against the fuel tank. This may ultimately result in the fuel tank not being properly secured to the mounting object. [Means for solving the problem]

[0007] A fuel tank fixing device that solves the above problem includes a movable member that can be attached to and detached from a fuel tank that stores fuel gas used in a fuel cell, an elastic member provided on the movable member so as to face the fuel tank, an adjustment mechanism that includes a columnar adjustment member and is capable of adjusting the amount of movement of the movable member, and a frame that is provided at a position facing the fuel tank and has an insertion hole through which the adjustment member is inserted at the position facing the movable member, wherein the movable member has a recessed portion that defines an insertion hole into which the tip surface of the adjustment member is inserted and includes a bottom surface against which the tip surface can abut, and the adjustment mechanism is a fuel tank fixing device that fixes the fuel tank to a mounting object on which the fuel cell is mounted by using the adjustment member to bring the movable member closer to the fuel tank and pressing the elastic member against the fuel tank, and the recessed portion has a guide surface that extends toward the central axis of the insertion hole as it moves from the entrance of the insertion hole toward the bottom surface.

[0008] According to the above configuration, it is assumed that the position of the recessed portion of the movable member and the position of the insertion hole formed in the frame are misaligned due to the attitude of the movable member relative to the fuel tank. When the adjustment member moves the movable member closer to the fuel tank, the leading edge of the adjustment member abuts against the guide surface of the recessed portion, causing the leading edge of the adjustment member to slide along the guide surface. The leading edge of the adjustment member is then guided toward the bottom surface of the recessed portion. The leading edge of the adjustment member then abuts against the bottom surface of the recessed portion. The attitude of the movable member is then corrected along the leading edge of the adjustment member. Therefore, the force with which the adjustment member presses the movable member is sufficiently transmitted to the elastic member, and the elastic member is sufficiently pressed against the fuel tank. Therefore, even if the position of the recessed portion of the movable member and the position of the insertion hole formed in the frame are misaligned, the fuel tank can be properly secured to the mounting object.

[0009] In the above fuel tank fixing device, the guide surface may be annular. The offset between the position of the recessed portion of the movable member and the position of the insertion hole formed in the frame changes each time the fuel tank is fixed to the mounting object. According to the above configuration, because the guide surface is annular, the guide surface can guide the tip surface of the adjustment member to the bottom surface of the recessed portion regardless of the offset between the position of the recessed portion of the movable member and the position of the insertion hole formed in the frame.

[0010] In the above fuel tank fixing device, the guide surface may be an inclined surface. According to the above configuration, the guide surface can be made to have a simple shape, while the leading edge of the adjustment member is less likely to get caught on the guide surface. [Effects of the Invention]

[0011] According to the present invention, the fuel tank can be appropriately fixed to the mounting object. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a front view of the fuel tank fixing device. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. [Figure 4] 10A and 10B are cross-sectional views showing an example of the posture of a moving member. [Figure 5] 10 is a cross-sectional view showing a state in which an adjustment member is inserted into a recessed portion of a moving member. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a specific embodiment of a fuel tank fixing device will be described with reference to Figures 1 to 5. The fuel tank fixing device of this embodiment is used in, for example, a fuel cell type forklift.

[0014] <Fuel tank fixing device> As shown in Figures 1 and 2, the fuel tank fixing device 10 is a device that fixes a fuel tank 100 to a fuel cell forklift that is an object on which a fuel cell is to be mounted. The fuel tank 100 is a tank that stores fuel gas used in the fuel cell. In this embodiment, the fuel tank 100 stores hydrogen as the fuel gas. The fuel tank 100 is formed into an overall cylindrical shape. The direction in which the axis of the fuel tank 100 extends is defined as an axial direction A.

[0015] The fuel tank 100 has an outer peripheral surface 101 and a tank end surface 102. The outer peripheral surface 101 is a cylindrical surface. The tank end surfaces 102 are surfaces located at both ends of the fuel tank 100 in the axial direction A. The tank end surfaces 102 are continuous with the outer peripheral surface 101. The tank end surfaces 102 bulge outward in the axial direction A from the outer peripheral surface 101 in a rounded shape. The outer peripheral surface 101 and the tank end surfaces 102 form the outer surface of the fuel tank 100.

[0016] The fuel tank fixing device 10 includes a base weight 20, multiple tank cradles 30, two support arms 41, 42, a frame 50, and a tank fixing structure 60. The base weight 20 is a weight provided on the vehicle body (not shown) to balance the weight of the forklift. All of the tank cradles 30 are provided on the upper surface of the base weight 20. A fuel tank 100 is placed on all of the tank cradles 30. The tank cradles 30 support the outer peripheral surface 101 of the fuel tank 100. The fuel tank 100 is mounted on the base weight 20 via all of the tank cradles 30.

[0017] Two support arms 41, 42 are fixed to the base weight 20. One support arm 41 is disposed on one end side of the fuel tank 100 in the axial direction A, and the other support arm 42 is disposed on the other end side of the fuel tank 100 in the axial direction A. The two support arms 41, 42 are disposed so as to rise vertically from the base weight 20.

[0018] The frame 50 is suspended between the two support arms 41, 42. The frame 50 may be formed integrally with the two support arms 41, 42, or may be formed separately from the two support arms 41, 42. When the frame 50 is formed separately from the two support arms 41, 42, the frame 50 is fixed to the two support arms 41, 42 with fixing members such as bolts.

[0019] The frame 50 is disposed above the fuel tank 100. The frame 50 is disposed at a predetermined distance from the outer peripheral surface 101 of the fuel tank 100. The frame 50 is disposed parallel to the axial direction A of the fuel tank 100.

[0020] As shown in FIG. 3, the frame 50 is formed with two guide holes 51 and two insertion holes 52. The two insertion holes 52 are aligned in the axial direction A. A thread groove 52a is formed on the inner peripheral surface of the insertion hole 52. The two guide holes 51 are disposed at positions sandwiching the two insertion holes 52 in the axial direction A. The two guide holes 51 and the two insertion holes 52 are aligned in a row in the axial direction A. Each guide hole 51 and each insertion hole 52 faces a portion located at the top of the outer peripheral surface 101 of the fuel tank 100 shown in FIG. 2.

[0021] <Tank fixing structure> The tank fixing structure 60 includes a guide pin 61, a movable member 70, an elastic member 62, a bolt 63 as a columnar adjustment member, and a nut 64. That is, the fuel tank fixing device 10 includes the movable member 70, the elastic member 62, the bolt 63, and the frame 50.

[0022] Two guide pins 61 are provided at a predetermined interval in the axial direction A. The guide pins 61 are inserted into the respective guide holes 51 of the frame 50. The guide pins 61 are round pins with a circular cross section. The outer diameter of the guide pins 61 is slightly smaller than the inner diameter of the guide holes 51. The guide pins 61 have a first end 61a and a second end 61b. The first end 61a is located above the frame 50. The second end 61b is located below the frame 50. The guide pins 61 are movable in the up and down direction by being guided by the inner circumferential surface that defines the guide holes 51 of the frame 50. A retaining clip (not shown) is provided on the first end 61a of the guide pin 61. The retaining clip prevents the guide pins 61 from falling out of the frame 50.

[0023] 2 and 3, the moving member 70 is provided between the frame 50 and the fuel tank 100. The moving member 70 is provided at a position facing each of the guide holes 51 and each of the insertion holes 52. That is, the frame 50 has each of the guide holes 51 and each of the insertion holes 52 formed at a position facing the moving member 70.

[0024] The moving member 70 has a base material 71 and a plurality of support members 72. The base material 71 is in the form of a long plate extending in the axial direction A. The second ends 61b of the guide pins 61 are attached to the base material 71. All of the support members 72 are attached to the lower surface of the base material 71. All of the support members 72 are attached to the base material 71 at intervals in the axial direction A. All of the support members 72 are fixed to the base material 71 by, for example, welding.

[0025] If the direction orthogonal to both the axial direction A and the vertical direction Vd is defined as the width direction, the dimension of the support member 72 in the width direction is larger than the dimension of the base material 71 in the width direction. The support member 72 has protruding plate portions 72a that protrude from both ends of the base material 71 in the width direction. The base material 71 is movable in the vertical direction together with the guide pins 61. Therefore, the movable member 70 is supported in a state in which it is suspended from the frame 50 by the guide pins 61. The movable member 70 is movable in the vertical direction together with the guide pins 61. In other words, the movable member 70 is capable of moving toward and away from the fuel tank 100.

[0026] 2, the elastic member 62 is a rubber member such as an elastomer. The elastic member 62 is attached to the support member 72 in a manner that embraces the protruding plate portion 72a of each support member 72. The elastic member 62 faces the fuel tank 100. In other words, the elastic member 62 is provided on the moving member 70 so as to face the fuel tank 100. The elastic member 62 may be an elastic resin member.

[0027] As shown in FIG. 3 , two bolts 63 are provided at a predetermined interval in the axial direction A. The bolts 63 are inserted into the respective insertion holes 52. The bolts 63 are threaded into thread grooves 52a formed on the inner circumferential surface of the respective insertion holes 52. The bolts 63 are arranged vertically. The bolts 63 have a head 63a and a tip surface 63b. The head 63a is located above the frame 50. The tip surface 63b is located below the frame 50. The tip surface 63b is a surface perpendicular to the axis of the bolt 63.

[0028] When the bolt 63 is rotated in a first direction, the entire bolt 63 moves toward the moving member 70. When the bolt 63 is rotated in a second direction that is the opposite direction to the first direction, the entire bolt 63 moves away from the moving member 70.

[0029] 1 and 2, when the bolt 63 rotates in a first direction with the tip surface 63b of the bolt 63 in contact with the base material 71 of the moving member 70, the bolt 63 pushes the moving member 70 together with the elastic member 62 toward the fuel tank 100. At this time, the elastic member 62 is compressed between the moving member 70 and the fuel tank 100, and the fuel tank 100 is fixed between the elastic member 62 and the tank holder 30. The bolt 63 and the thread groove 52a form an adjustment mechanism 90 that can adjust the amount of movement of the moving member 70. The adjustment mechanism 90 includes the bolt 63. Therefore, the adjustment mechanism 90 fixes the fuel tank 100 to the mounting target by using the bolt 63 to bring the moving member 70 closer to the fuel tank 100 and pressing the elastic member 62 against the fuel tank 100.

[0030] When the bolt 63 is rotated in the second direction while the elastic member 62 is compressed between the movable member 70 and the fuel tank 100, the compression of the elastic member 62 is reduced. When the compression of the elastic member 62 is released by continuing to rotate the bolt 63 in the second direction, the fuel tank 100 is released from the mounting object.

[0031] The nut 64 is disposed above the frame 50. The nut 64 is threaded onto the bolt 63 above the frame 50. The nut 64 functions as a fixing member that fixes the position of the moving member 70 while pressing the elastic member 62 against the fuel tank 100. Specifically, when the nut 64 is tightened, the tightening force of the nut 64 causes the bolt 63 to rotate in the second direction, thereby preventing the bolt 63 from separating from the moving member 70. This determines the amount of protrusion of the bolt 63 relative to the position of the frame 50 and the vertical position of the moving member 70. Therefore, the position of the moving member 70 can be fixed by tightening the nut 64.

[0032] <Recessed part> As shown in FIG. 3, the moving member 70 has recessed portions 73. Two recessed portions 73 are provided at a predetermined interval in the axial direction A. The recessed portions 73 are arranged at positions facing the respective insertion holes 52. The recessed portions 73 are recessed from the upper surface 71a of the base material 71 that faces the frame 50. The tip end surface 63b of the bolt 63 is inserted into the recessed portions 73. The recessed portions 73 define an insertion hole H73 into which the tip end surface 63b of the bolt 63 is inserted.

[0033] The recessed portion 73 has a bottom surface 73a, a cylindrical surface 73b, and a guide surface 73c. ​​The bottom surface 73a is a surface located at the bottom of the insertion hole H73. The bottom surface 73a extends parallel to the upper surface 71a. The bottom surface 73a is circular. The diameter of the bottom surface 73a is slightly larger than the diameter of the bolt 63. The tip surface 63b of the bolt 63 abuts against the bottom surface 73a. Therefore, the recessed portion 73 has the bottom surface 73a against which the tip surface 63b of the bolt 63 can abut.

[0034] The cylindrical surface 73b is continuous with the edge of the bottom surface 73a. The guide surface 73c is continuous with the edge of the cylindrical surface 73b located on the opposite side from the bottom surface 73a. The guide surface 73c is annular. The guide surface 73c is an inclined surface. The guide surface 73c gradually reduces in diameter from the entrance 73d of the insertion hole H73 toward the bottom surface 73a. An imaginary line that passes through the center of the bottom surface 73a and extends in a direction perpendicular to the bottom surface 73a is defined as the central axis m of the insertion hole H73. The guide surface 73c is a surface that is smoothly continuous around the entire circumference in the direction of extension of a circle drawn about the central axis m. The guide surface 73c extends toward the central axis m as it moves from the entrance 73d of the insertion hole H73 toward the bottom surface 73a.

[0035] 4, the guide pin 61 may rattle inside the guide hole 51, causing the attitude of the movable member 70 relative to the fuel tank 100 to change. When the attitude of the movable member 70 changes, the relative position of the recessed portion 73 and the insertion hole 52 shifts. The dimension of the guide surface 73c in the direction perpendicular to the central axis m is set so that the entire tip surface 63b of the bolt 63 is included in the range in which the recessed portion 73 is formed, even if the attitude of the movable member 70 relative to the fuel tank 100 changes.

[0036] 4 and 5, it is assumed that the bolt 63 is rotated in the first direction with the leading edge of the bolt 63 in contact with the guide surface 73c. ​​In this case, the inclination angle of the guide surface 73c with respect to the central axis m is set to such an extent that the leading edge of the bolt 63 slides on the guide surface 73c toward the bottom surface 73a.

[0037] [Operation of this embodiment] The operation of this embodiment will be described. As shown in FIG. 4, assume that the position of the recessed portion 73 and the position of the insertion hole 52 are misaligned due to the attitude of the moving member 70 relative to the fuel tank 100. When the moving member 70 is moved closer to the fuel tank 100 by the bolt 63, the leading edge of the bolt 63 abuts against the guide surface 73c of the recessed portion 73, causing the leading edge of the bolt 63 to slide along the guide surface 73c. ​​As a result, the leading surface 63b of the bolt 63 is guided toward the bottom surface 73a of the recessed portion 73. Then, as shown in FIG. 5, the leading surface 63b of the bolt 63 abuts against the bottom surface 73a of the recessed portion 73. As a result, the attitude of the moving member 70 is corrected along the leading surface 63b of the bolt 63. Therefore, the force with which the bolt 63 presses the moving member 70 is sufficiently transmitted to the elastic member 62, and the elastic member 62 is sufficiently pressed against the fuel tank 100. Therefore, even if the position of the recessed portion 73 and the position of the insertion hole 52 are misaligned, the fuel tank 100 can be properly fixed to the mounting object.

[0038] [Effects of this embodiment] The effects of this embodiment will be described. (1) Since the guide surface 73c is provided in the recessed portion 73, the guide surface 73c can guide the tip surface 63b of the bolt 63 to the bottom surface 73a of the recessed portion 73. Then, the posture of the moving member 70 is corrected along the tip surface 63b of the bolt 63. Therefore, the elastic member 62 can be sufficiently pressed against the fuel tank 100 by the bolt 63. Therefore, even if the position of the recessed portion 73 and the position of the insertion hole 52 are misaligned, the fuel tank 100 can be properly fixed to the mounting object.

[0039] (2) Because the guide surface 73c is annular, the tip surface 63b of the bolt 63 can be guided to the bottom surface 73a of the recess 73 by the guide surface 73c regardless of the deviation between the position of the recess 73 and the position of the insertion hole 52.

[0040] (3) The guide surface 73c is an inclined surface, which allows the guide surface 73c to have a simple shape while making it difficult for the tip surface 63b of the bolt 63 to get caught on the guide surface 73c. [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0041] The recess 73 has a bottom surface 73a and a guide surface 73c, and the cylindrical surface 73b may be omitted. In this case, the guide surface 73c is continuous with the edge of the bottom surface 73a. The guide surface 73c does not have to be an inclined surface. For example, the guide surface 73c may be a curved surface. Even in such a case, it is preferable that the diameter of the guide surface 73c gradually decreases from the entrance 73d of the insertion hole H73 toward the bottom surface 73a.

[0042] The bottom surface 73a of the recess 73 may be rectangular. In this case, the size of the bottom surface 73a is made larger than the tip surface 63b of the bolt 63. The cylindrical surface 73b may be changed to a square tubular surface that is continuous with the four sides of the bottom surface 73a. The guide surfaces 73c may be continuous with the four edges of the square tubular surface that are located on the opposite side of the bottom surface 73a.

[0043] Guide surface 73c does not have to be a surface that is smoothly continuous over the entire circumference in the direction of extension of a circle drawn around central axis m. For example, in the above modified example, if cylindrical surface 73b is changed to a square cylindrical surface, guide surface 73c may be formed by multiple inclined surfaces that are continuous with the four edges of the square cylindrical surface. In this case, a linear boundary is formed between adjacent inclined surfaces of guide surface 73c. ​​The number of inclined surfaces that form guide surface 73c may be changed as appropriate.

[0044] The guide surface 73c does not have to be annular. For example, it may be a surface extending in one direction from the edge of the cylindrical surface 73b of the recessed portion 73. Even in this case, it is sufficient that the guide surface 73c extends toward the central axis m from the entrance 73d of the insertion hole H73 toward the bottom surface 73a. Note that the position at which the guide surface 73c is provided should be a position that faces the tip surface 63b of the bolt 63, even if the attitude of the movable member 70 with respect to the fuel tank 100 changes.

[0045] Although the bolt 63 is used as the adjustment member, this is not limiting. For example, a columnar round bar may be used as the adjustment member instead of the bolt 63. When the round bar is inserted through the insertion hole 52, a first end of the round bar is positioned above the frame 50 and a second end of the round bar is positioned below the frame 50. The second end of the round bar is inserted into the recess 73. The first end of the round bar may be pressed toward the moving member 70 by, for example, a pressing mechanism (not shown). When the pressing mechanism presses the round bar, the elastic member 62 is pressed against the fuel tank 100, thereby fixing the fuel tank 100 between the elastic member 62 and the tank support 30. When the pressing force of the pressing mechanism on the first end of the round bar is reduced, the compression of the elastic member 62 is reduced. When the pressing force of the pressing mechanism on the first end of the round bar is continuously reduced, the compression of the elastic member 62 is released, and the fuel tank 100 is released from the mounting target. That is, the adjustment mechanism 90 may be configured using a round bar and a pressing mechanism. In this case, the nut 64 may be omitted.

[0046] The shape of the fuel tank 100 may be changed as appropriate. The fuel tank 100 only needs to have a surface that is pressed by the elastic member 62. ○ The equipment may be a stationary fuel cell power generator.

[0047] The fuel tank fixing device 10 may include the base weight 20, the two support arms 41, 42, the frame 50, and the tank fixing structure 60, and the multiple tank pedestals 30 may be omitted. In this case, for example, the fuel tank 100 is mounted on the base weight 20. The fuel tank 100 may then be sandwiched between the elastic member 62 and the base weight 20.

[0048] The mounting target may be a fuel cell vehicle other than a fuel cell-powered forklift. In this case, the fuel tank fixing device 10 only needs to include a frame 50 and a tank fixing structure 60. The frame 50 may be fixed to any location on the body of the fuel cell vehicle or may be formed integrally with the frame 50. It is only necessary that the fuel tank 100 is fixed to the fuel cell vehicle by the tank fixing structure 60.

[0049] The guide holes 51 and the insertion holes 52 do not have to be aligned in a row in the axial direction A. The number of guide holes 51 may be changed as needed. The number of guide pins 61 may be changed as needed depending on the number of guide holes 51.

[0050] The number of the insertion holes 52 may be changed as needed. The number of the adjustment members may be changed as needed depending on the number of the insertion holes 52. [Explanation of symbols]

[0051] 10...Fuel tank fixing device, 50...Frame, 52...Insertion hole, 62...Elastic member, 63...Bolt, 63b...Tip surface, 70...Moving member, 73...Recessed portion, 73a...Bottom surface, 73c...Guide surface, 73d...Inlet of insertion hole, 90...Adjustment mechanism, 100...Fuel tank, H73...Insertion hole, m...Central axis.

Claims

1. a moving member that can be brought into contact with and separated from a fuel tank that stores fuel gas used in the fuel cell; an elastic member provided on the moving member so as to face the fuel tank; an adjustment mechanism including a columnar adjustment member and capable of adjusting the amount of movement of the moving member; a frame provided at a position facing the fuel tank, the frame having an insertion hole formed at a position facing the moving member, through which the adjustment member is inserted, the moving member has a recessed portion that defines an insertion hole into which the tip surface of the adjustment member is inserted and includes a bottom surface against which the tip surface can abut, the adjustment mechanism is a fuel tank fixing device that fixes the fuel tank to a mounting object on which the fuel cell is mounted by bringing the moving member closer to the fuel tank with the adjustment member and pressing the elastic member against the fuel tank, The fuel tank fixing device according to claim 1, wherein the recessed portion has a guide surface that extends from the entrance of the insertion hole toward the bottom surface and toward the central axis of the insertion hole.

2. 2. The fuel tank fixing device according to claim 1, wherein the guide surface is annular.

3. 3. The fuel tank fixing device according to claim 1, wherein the guide surface is an inclined surface.

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