Fuel cell stack mounting structure

Abstract

The difference in load distribution across the rubber mounts positioned in the front-to-back direction is minimized as much as possible. [Solution] A fuel cell stack mounting structure in which a mounting frame 23 is fastened to a vehicle body frame 22, and a fuel cell stack 21 is fastened to the mounting frame 23 via rubber mounts 24f and 24r.

Description

Technical Field

[0001] The present disclosure relates to a mounting structure for a fuel cell stack.

Background Art

[0002] In the fuel cell mounting structure described in Patent Document 1 below, a fuel cell stack is mounted on the upper side of a suspension member via a stack frame. The bottom of the fuel cell stack is fixed to the stack frame by bolts or the like. The front of the stack frame is fixed to the suspension member via a front fixing member that is a mount attachment portion and a rubber mount. Both sides of the middle portion (slightly rearward) in the front-rear direction of the stack frame are fixed to the suspension member via rear fixing members that are rubber mounts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, as shown in FIG. 4 of the same document, the specifications of the front fixing member and the rear fixing member are different, and since they support at positions that are uneven in the front-rear direction with respect to the center of gravity, the shared loads are also different. When the shared loads are different, it is necessary to make the strength durability conditions of the front fixing member and the rear fixing member different. The rear fixing member close to the center of gravity needs to be in a form and size that is strong against rubber durability.

[0005] An object of the present disclosure is to minimize the difference in the shared load on rubber mounts arranged in the front-rear direction.

Means for Solving the Problems

[0006] This disclosure relates to a fuel cell stack mounting structure in which a mounting frame is fastened to the vehicle body frame, and a fuel cell stack is fastened to the mounting frame via rubber mounts. [Effects of the Invention]

[0007] According to this disclosure, the difference in load distribution to rubber mounts arranged in the front-rear direction can be minimized. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a side view showing the fuel cell stack mounting structure according to this embodiment. [Figure 2] Figure 2 is a partial perspective view showing the fuel cell stack mounting structure according to this embodiment. [Modes for carrying out the invention]

[0009] This embodiment will now be described with reference to the attached drawings. To facilitate understanding of the explanation, the same reference numerals are used for identical components in each drawing whenever possible, and redundant explanations are omitted.

[0010] Figure 1 is a side view showing a fuel cell stack mounting structure according to this embodiment. The left-right direction in the figure represents the front-rear direction of the vehicle, and direction Fr is the forward direction. The up-down direction in the figure represents the up-down direction of the vehicle, and direction Upr is the upward direction.

[0011] As shown in Figure 1, the mounting frame 23 is rigidly fastened to the vehicle body frame 22. The vehicle body frame 22 has sections with different heights in the direction along the Upr direction. The mounting frame 23 is rigidly fastened to the sections of the vehicle body frame 22 with different heights, and is configured so that the side facing the fuel cell stack 21 has no difference in height.

[0012] The mounting frame 23 has a front rubber mount 24f and a rear rubber mount 24r attached to it. The front rubber mount 24f and the rear rubber mount 24r are fastened and fixed to the fuel cell stack 21. The horizontal distance A between the center of gravity 21a of the fuel cell stack 21 and the front rubber mount 24f, and the horizontal distance B between the center of gravity 21a of the fuel cell stack 21 and the rear rubber mount 24r are set to be approximately the same.

[0013] As shown in Figure 2, the front rubber mount 24f comprises an outer cylinder portion 24fa and an inner cylinder portion 24fb. A donut-shaped rubber bushing is interposed between the outer cylinder portion 24fa and the inner cylinder portion 24fb. The rear rubber mount 24r comprises an outer cylinder portion 24ra and an inner cylinder portion 24rb. A donut-shaped rubber bushing is interposed between the outer cylinder portion 24ra and the inner cylinder portion 24rb.

[0014] The outer cylinder portion 24fa and the outer cylinder portion 24ra are fixed to the mounting frame 23 via the second bracket 26. The inner cylinder portion 24fb and the inner cylinder portion 24rb are fixed to the fuel cell stack 21 via the first bracket 25.

[0015] Figures 1 and 2 illustrate the left side as seen from the front of the vehicle. The right side as seen from the front of the vehicle has a similar structure to the left side. Accordingly, the fuel cell stack 21 is fixed to the mounting frame 23 by a pair of front rubber mounts 24f on the left and right sides and a set of rear rubber mounts 24r on the left and right sides.

[0016] The embodiments have been described above with reference to specific examples. However, this disclosure is not limited to these specific examples. Modifications made to these specific examples by those skilled in the art are also included within the scope of this disclosure, as long as they retain the features of this disclosure. The elements, their arrangement, conditions, shapes, etc., of each of the aforementioned specific examples are not limited to those illustrated and can be modified as appropriate. The elements of each of the aforementioned specific examples can be combined in different ways as appropriate, as long as no technical inconsistencies arise.

[0017] [Note] [Appendix 1] A fuel cell stack mounting structure in which a mounting frame 23 is fastened to a vehicle body frame 22, and a fuel cell stack 21 is fastened to the mounting frame 23 via a front rubber mount 24f and a rear rubber mount 24r.

[0018] According to Appendix 1, since the mounting frame 23 is directly and rigidly fastened to the vehicle body frame 22, not only the vehicle body frame 22 but also the mounting frame 23 can share the impact load. Although the vehicle body frame 22 may have portions with different heights in the direction along Upr, the mounting frame 23 serves to absorb the height difference, so that the height difference on the side supporting the fuel cell stack 21 can be substantially eliminated. Therefore, the front rubber mount 24f and the rear rubber mount 24r can be arranged at substantially equal distances from the center of gravity 21a of the fuel cell stack 21 in the front and rear directions, the shared loads can be made substantially the same, and the specifications of the front rubber mount 24f and the rear rubber mount 24r can be integrated. Since the specifications of the front rubber mount 24f and the rear rubber mount 24r can be integrated, the specifications of the outer cylinder part 24fa and the outer cylinder part 24ra can also be integrated, and the specifications of the inner cylinder part 24fb and the inner cylinder part 24rb can also be integrated.

Explanation of Reference Numerals

[0019] 21: Fuel cell stack 22: Vehicle body frame 23: Mounting frame 24f: Front rubber mount 24fa: Outer cylinder part 24fb: Inner cylinder part 24r: Rear rubber mount 24ra: Outer cylinder part 24rb: Inner cylinder part 25: First bracket 26: Second bracket

Claims

[Claim 1] A fuel cell stack mounting structure in which a mounting frame is fastened to the vehicle body frame, and the fuel cell stack is fastened to the mounting frame via rubber mounts.

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