Leaf spring, unit cell

Abstract

SOLUTION: A plate spring 28 includes a disc member 30 and a plurality of claws 32 provided on the disc member, positioned between an outer peripheral end 30t2 of the disc member and an inner peripheral end 30t1 of the disc member, and arranged along a circumferential direction CD of the disc member, wherein each of the plurality of claws extends along a radial direction RD of the disc member and warps in a thickness direction TD of the disc member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to leaf springs. [Background technology]

[0002] Patent Document 1 discloses a water electrolysis device including a leaf spring and a cathode current collector. The leaf spring applies a load to the cathode current collector. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-157213 Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, there has been a demand for a leaf spring that can better apply a load (surface pressure) to a pressed body such as a cathode current feeder.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] One aspect of the present disclosure is a leaf spring comprising: a disk member; and a plurality of claw portions provided on the disk member, positioned between an outer peripheral end of the disk member and an inner peripheral end of the disk member, and arranged along the circumferential direction of the disk member, each of the plurality of claw portions extending along the radial direction of the disk member and warped in the thickness direction of the disk member. [Effects of the Invention]

[0007] According to the present invention, the leaf spring can effectively apply a surface pressure to the pressed body. [Brief explanation of the drawings]

[0008] [Figure 1]FIG. 1 is a schematic diagram showing a water electrolysis stack according to one embodiment. [Figure 2] FIG. 2 is an exploded view of a unit cell included in the water electrolysis stack. [Figure 3] FIG. 3 is a plan view showing the leaf springs and plate-shaped members provided in the unit cell. [Figure 4] FIG. 4 is a cross-sectional view showing a part of the leaf spring and a part of the plate-shaped member. [Figure 5] FIG. 5 is a cross-sectional view showing a part of a leaf spring and a part of a plate-shaped member according to the first modification. DETAILED DESCRIPTION OF THE INVENTION

[0009] (One embodiment) FIG. 1 is a schematic diagram showing a water electrolysis stack 10 according to one embodiment.

[0010] The water electrolysis stack 10 includes a plurality of stacked unit cells 12. The water electrolysis stack 10 is provided in, for example, a water electrolysis apparatus. The water electrolysis apparatus including the water electrolysis stack 10 is, for example, a differential pressure type high-pressure water electrolysis apparatus.

[0011] Each of the unit cells 12 has a generally disk-like appearance. A hydrogen through hole 10c is formed in the radial center of the unit cell 12. The hydrogen through hole 10c extends along the stacking direction of the unit cells 12 in the water electrolysis stack 10. Hydrogen (high-pressure hydrogen) generated by the water electrolysis apparatus can be extracted from the unit cells 12 (water electrolysis stack 10) through the hydrogen through hole 10c.

[0012] FIG. 2 is an exploded view of a unit cell 12 included in the water electrolysis stack 10. As shown in FIG.

[0013] 2, the unit cell 12 includes a first separator 16, a second separator 18, an electrolyte membrane catalyst structure 20, a first current feeder 22, a second current feeder 24, a plate-shaped member 26, and a leaf spring 28. Note that elements that can be included in the unit cell 12 are not limited to these (see, for example, Patent Document 1), but a description thereof will be omitted in this embodiment.

[0014] The first separator 16 is used as a cathode separator in the unit cell 12. On the other hand, the second separator 18 is used as an anode separator in the unit cell 12. Each of the first separator 16 and the second separator 18 is, for example, a carbon member, but may also be a metal member.

[0015] The electrolyte membrane catalyst structure 20 is a structure located between the first separator 16 and the second separator 18. The electrolyte membrane catalyst structure 20 includes a PEM 201 and a first catalyst layer 202. The PEM 201 is, for example, a hydrocarbon-based or fluorine-based polymer electrolyte membrane. The polymer electrolyte membrane includes a solid polymer electrolyte membrane. The first catalyst layer 202 is provided on a surface of the PEM 201 facing the first separator 16. The first catalyst layer 202 includes, for example, a platinum-based catalyst. Although not specifically shown, the electrolyte membrane catalyst structure 20 further includes a second catalyst layer 203. The second catalyst layer 203 is provided on a surface (not shown) of the PEM 201 facing the second separator 18. The second catalyst layer 203 includes, for example, a ruthenium-based catalyst.

[0016] The electrolyte membrane catalyst structure 20 is sandwiched between a first current feeder 22 and a second current feeder 24. The first current feeder 22 is a disk-shaped cathode current feeder located between the electrolyte membrane catalyst structure 20 and the first separator 16, which is the cathode separator. In contrast, the second current feeder 24 is a disk-shaped anode current feeder located between the electrolyte membrane catalyst structure 20 and the second separator 18, which is the anode separator.

[0017] The plate-shaped member 26 is a disk-shaped member located between the first power supply member 22 and the first separator 16. The plate-shaped member 26 is, for example, a conductive member (conductive sheet) made of a metal (alloy). Examples of materials for the plate-shaped member 26 include, but are not limited to, stainless steel (SUS) alloys. The radial direction of the plate-shaped member 26 coincides with the radial direction of the unit cells 12 described above. A through-hole 26c is formed in the center of the plate-shaped member 26 in the radial direction. The through-hole 26c penetrates the plate-shaped member 26 along the stacking direction of the unit cells 12. The through-hole 26c may form part of the hydrogen communication hole 10c.

[0018] Fig. 3 is a plan view showing the leaf spring 28 and the plate-shaped member 26 provided in the unit cell 12. Fig. 3 shows a plan view in a thickness direction TD (thickness direction view) described below. Fig. 4 is a cross-sectional view showing a part of the leaf spring 28 and a part of the plate-shaped member 26. Fig. 4 shows a cross section taken along line IV-IV in Fig. 3.

[0019] The leaf spring 28 is a biasing member provided between the plate-shaped member 26 and the first separator 16. The leaf spring 28 may be made of a metal (alloy). The alloy may be, for example, a SUS-based alloy, but is not limited to this. The leaf spring 28 includes a disk member 30 and a plurality of claws 32 provided on the disk member 30.

[0020] The disk member 30 has a disk shape concentric with the plate-shaped member 26. The radial direction RD of the disk member 30 coincides with the radial direction of the unit cells 12 described above. Therefore, the radial direction RD also coincides with the radial direction of the plate-shaped member 26 described above. A central hole 30c is formed in the center of the disk member 30 in the radial direction RD. The central hole 30c defines an inner peripheral end 30t1 of the disk member 30 in the radial direction RD.

[0021] The disk member 30 has a first surface portion 30s1 and a second surface portion 30s2. The first surface portion 30s1 is a surface portion of the disk member 30 that faces a first direction TD1. The first direction TD1 is a direction along the thickness direction TD of the disk member 30. In contrast, the second surface portion 30s2 is a surface portion of the disk member 30 that faces a second direction TD2. The second direction TD2 is the opposite direction to the first direction TD1.

[0022] The thickness direction TD coincides with the stacking direction of the unit cells 12 in the water electrolysis stack 10 (FIG. 1). The first direction TD1 coincides with the direction from the second separator 18 (anode separator) to the first separator 16 (cathode separator).

[0023] The plurality of claw portions 32 are located between the outer circumferential end 30t2 and the inner circumferential end 30t1 of the disk member 30 in the radial direction RD. That is, as shown in FIGS. 3 and 4, a plurality of holes 34 are formed in the disk member 30. A plurality of claw portions 32 may be provided inside each of the plurality of holes 34. The plurality of holes 34 are provided so as to surround the central hole 30c along the circumferential direction CD of the disk member 30. Therefore, the plurality of claw portions 32 provided inside the plurality of holes 34 are provided so as to surround the central hole 30c along the circumferential direction CD.

[0024] The plurality of claws 32 include a plurality of claw groups 36. Each of the plurality of claw groups 36 is made up of a plurality of claws 32 arranged in an annular shape along the circumferential direction CD. The plurality of claw groups 36 includes an inner claw group 361 and an outer claw group 362. The outer claw group 362 is located radially outward from the inner claw group 361. The radially outward direction of the disc member 30 is the direction from the inner claw group 361 toward the opposite side of the central hole 30c along the radial direction RD.

[0025] FIG. 3 shows an imaginary line segment VLS and an imaginary circle VC. The imaginary line segment VLS is an imaginary line segment that connects the outer peripheral end 30t2 and the inner peripheral end 30t1 in the radial direction RD at the shortest distance. The imaginary circle VC is an imaginary circle that is concentric with the disk member 30 and passes through a midpoint P of the imaginary line segment VLS. The circumferential direction of the imaginary circle VC coincides with the circumferential direction CD of the disk member 30. The outer claw group 362 is located radially outward from the imaginary circle VC. In contrast, the inner claw group 361 is located radially inward from the imaginary circle VC. However, one of the inner claw group 361 and the outer claw group 362 may overlap with the imaginary circle VC in a plan view in the thickness direction TD (thickness direction view). The radially inward direction is the opposite direction to the radially outward direction described above.

[0026] Preferably, at least one claw 32 belonging to the inner claw group 361 is adjacent to a claw 32 belonging to the outer claw group 362 in the radial direction RD, but is not limited to this. The outer claw group 362 may include a claw 32 adjacent to a claw 32 belonging to the inner claw group 361 in the radial direction RD, and a claw 32 that is not adjacent to a claw 32 belonging to the inner claw group 361 in the radial direction RD. In this case, the claw 32 of the outer claw group 362 that is adjacent to a claw 32 of the inner claw group 361 in the radial direction RD and the claw 32 of the outer claw group 362 that is not adjacent to a claw 32 of the inner claw group 361 in the radial direction RD may be arranged alternately along the circumferential direction CD ( FIG. 3 ).

[0027] Although not shown in the drawings, the plurality of claw portions 32 may have three or more claw portion groups 36. In other words, two or more outer claw portion groups 362 may exist for one inner claw portion group 361. In this case, one of the plurality of claw portion groups 36 may overlap with the imaginary circle VC when viewed in the thickness direction.

[0028] Each of the plurality of claw portions 32 has a base end portion 32b and a tip end portion 32t. The base end portion 32b is one end of the claw portion 32 in the radial direction RD. The base end portion 32b is connected to the disk member 30 (the inner wall portion of the hole portion 34). The tip end portion 32t is an end of the claw portion 32 in the radial direction RD that is different from the base end portion 32b. As shown in FIG. 3, each of the plurality of claw portions 32 preferably has a shape that tapers from the base end portion 32b toward the tip end portion 32t.

[0029] The plurality of claws 32 include a plurality of outward claws 321 and a plurality of inward claws 322. The tip ends 32t of the outward claws 321 are positioned radially outward from the base ends 32b of the outward claws 321. In contrast, the tip ends 32t of the inward claws 322 are positioned radially inward from the base ends 32b of the inward claws 322.

[0030] As shown in FIG. 3 , the outward claws 321 and the inward claws 322 are alternately arranged along the circumferential direction CD. More specifically, the claws 32 belonging to the inner claw group 361 are composed of the outward claws 321 and the inward claws 322. The outward claws 321 belonging to the inner claw group 361 and the inward claws 322 belonging to the inner claw group 361 are alternately arranged along the circumferential direction CD. Similarly, the claws 32 belonging to the outer claw group 362 are also composed of the outward claws 321 and the inward claws 322. The outward claws 321 belonging to the outer claw group 362 and the inward claws 322 belonging to the outer claw group 362 are alternately arranged along the circumferential direction CD. In this embodiment, the inward claws 322 belonging to the outer claw group 362 are adjacent to the claws 32 belonging to the inner claw group 361 in the radial direction RD, but the present invention is not limited to this.

[0031] 4, the plurality of claw portions 32 are warped in the thickness direction TD. More specifically, the plurality of claw portions 32 are warped such that the tip portions 32t of the claw portions 32 protrude from the disk member 30 (hole portions 34) along the thickness direction TD. It is preferable that all of the plurality of claw portions 32 provided on the disk member 30 are warped in the first direction TD1.

[0032] The leaf spring 28 further includes an annular portion 38. The annular portion 38 is provided so as to extend from the outer peripheral end 30t2 along the second direction TD2. The annular portion 38 surrounds the disk member 30 along the circumferential direction CD. For example, the annular portion 38 is formed by bending a part of the base material forming the disk member 30 in the second direction TD2. In this case, the annular portion 38 is integral with the disk member 30. In addition, in this case, the annular portion 38 is formed from the same material as the disk member 30.

[0033] The annular portion 38 has an inner wall portion 38w. The inner wall portion 38w is a wall portion of the annular portion 38 that faces radially inward. The inner wall portion 38w extends from the disk member 30 along the second direction TD2. An annular groove portion 38g is formed at a base end 38b of the inner wall portion 38w that extends along the second direction TD2. The annular groove portion 38g is a bent portion formed in the base material by bending the disk member 30 to form the annular portion 38. In other words, the annular groove portion 38g can be formed by bending a portion of the disk member 30.

[0034] The plate-shaped member 26 described above is disposed at a position in the second direction TD2 relative to the disk member 30. The annular portion 38 surrounds the plate-shaped member 26 along the circumferential direction CD. The inner wall portion 38w may abut against the plate-shaped member 26.

[0035] The leaf spring 28 having the above configuration can achieve the effects described below.

[0036] The leaf spring 28 includes a disk member 30. The disk member 30 is provided with a plurality of claws 32. Each of the claws 32 extends along the radial direction RD of the disk member 30 and is warped in the thickness direction TD of the disk member 30. The claws 32 are warped, for example, in a first direction TD1. This allows the tip ends 32t of the claws 32 to be pressed in the second direction TD2 by a member disposed in the first direction TD1 relative to the leaf spring 28. For example, the tip ends 32t of the claws 32 can be pressed by the first separator 16. This allows the leaf spring 28 to apply a load (surface pressure) to a pressed body located in the second direction TD2 relative to the leaf spring 28 via the base ends 32b of the claws 32 and the disk member 30 connected to the base ends 32b. The pressed body is, for example, the first power supply body 22. The plate spring 28 can apply a surface pressure to the first current feeder 22 via the plate-shaped member 26 .

[0037] Furthermore, according to this embodiment, the plurality of claws 32 extending in the radial direction RD are arranged in the circumferential direction CD. As a result, the plurality of base ends 32b are arranged in a sufficiently dispersed manner when viewed in the thickness direction. The base ends 32b are portions that can apply a relatively large surface pressure to a pressed body. By arranging the plurality of base ends 32b in a sufficiently dispersed manner, the variation in the surface pressure when viewed in the thickness direction is reduced. In other words, the surface pressure distribution, which is the distribution of the surface pressure when viewed in the thickness direction, can be made uniform. The uniform surface pressure distribution allows, for example, good water electrolysis to be performed in a water electrolysis device including the water electrolysis stack 10.

[0038] Each of the plurality of claw portions 32 is warped in the first direction TD1. By warping all of the claw portions 32 in the first direction TD1, all of the claw portions 32 can apply a force in the second direction TD2 to the disk member 30. This further reduces the variation in the surface pressure in the second direction TD2 when viewed in the thickness direction.

[0039] The leaf spring 28 includes an annular portion 38. The annular portion 38 extends from the outer peripheral end 30t2 along the second direction TD2. The annular portion 38 prevents the outer peripheral end 30t2 of the disk member 30 from displacing along the thickness direction TD. This allows the leaf spring 28 to effectively apply surface pressure to the pressed body across the entire disk member 30 as viewed in the thickness direction. That is, as described above, the disk member 30 receives a force in the second direction TD2 via the base ends 32b of the claw portions 32. The base ends 32b are located between the inner peripheral end 30t1 and the outer peripheral end 30t2 of the disk member 30. When the disk member 30 is displaced (elastically deformed) in response to the force in the second direction TD2 received via the base ends 32b, the outer peripheral end 30t2 of the disk member 30 may be displaced along the first direction TD1. As a result, the outer peripheral end 30t2 may not be able to effectively apply surface pressure to the pressed body. In this regard, the annular portion 38 functions as a thick portion of the disk member 30. The annular portion 38, which is a thick portion, suppresses the above-mentioned displacement of the outer peripheral end 30t2 along the thickness direction TD. This allows the leaf spring 28 to effectively apply surface pressure to the pressed body across the entire disk member 30 as viewed in the thickness direction.

[0040] As described above, the plate-shaped member 26 is disposed in the second direction TD2 relative to the second surface portion 30s2 of the disk member 30. The plate-shaped member 26 has a disk shape concentric with the disk member 30. The annular portion 38 surrounds the plate-shaped member 26 along the circumferential direction CD. This allows the plate-shaped member 26 to be easily positioned relative to the leaf spring 28 by the annular portion 38.

[0041] The annular portion 38 is integrated with the disk member 30. Such an annular portion 38 can be formed by bending a portion of the base material that forms the disk member 30 (outer peripheral end 30t2). The annular portion 38 formed in this manner can suppress an increase in the number of parts of the leaf spring 28. The annular portion 38 formed by bending a portion of the disk member 30 can have an annular groove portion 38g that extends along the circumferential direction CD.

[0042] The plurality of claws 32 include outward claws 321 and inward claws 322. The outward claws 321 and the inward claws 322 are alternately arranged along the circumferential direction CD. This allows the plurality of base ends 32b to be more sufficiently dispersed in a plan view of the leaf spring 28. As a result, the variation in the surface pressure that the leaf spring 28 applies to the pressed body is further reduced.

[0043] Each of the plurality of claws 32 has a shape that tapers from the base end 32b to the tip end 32t. This makes it possible to arrange more claws 32 along the circumferential direction CD while ensuring the spacing between two adjacent claws 32 along the circumferential direction CD and the thickness of the claws 32. As a result, the variation in the surface pressure that the leaf spring 28 applies to the pressed body is further reduced.

[0044] The plurality of claws 32 includes an inner claw group 361 and an outer claw group 362. This allows the plurality of claws 32 to be arranged along the radial direction RD. As a result, the leaf spring 28 can apply a surface pressure to the pressed body more uniformly over the entire radial direction RD of the disc member 30.

[0045] At least one claw 32 belonging to the inner claw group 361 is adjacent to a claw 32 belonging to the outer claw group 362 in the radial direction RD. By arranging multiple claws 32 along the radial direction RD, the variation in the surface pressure applied by the leaf spring 28 to the pressed body in the radial direction RD is further reduced. In this case, the claws 32 of the outer claw group 362 that are adjacent to the claws 32 of the inner claw group 361 in the radial direction RD and the claws 32 of the outer claw group 362 that are not adjacent to the claws 32 of the inner claw group 361 in the radial direction RD may be alternately arranged along the circumferential direction CD. This further reduces the variation in the surface pressure applied by the leaf spring 28 to the pressed body in the radial direction RD. Furthermore, the claws 32 of the outer claw group 362 that are adjacent to the claws 32 of the inner claw group 361 in the radial direction RD are preferably inward claws 322. That is, it is preferable that the tip end 32t of the claw portion 32 of the outer claw portion group 362 adjacent in the radial direction RD to the claw portion 32 of the inner claw portion group 361 is located radially inward with respect to the base end portion 32b of the corresponding claw portion 32. This further reduces the variation in the radial direction RD of the surface pressure applied by the leaf spring 28 to the pressed body.

[0046] One embodiment may be modified as follows.

[0047] (Variation 1) 5 is a cross-sectional view showing a part of the leaf spring 28 and a part of the plate-shaped member 26 according to Modification 1. A cross-sectional view similar to FIG.

[0048] The annular portion 38 may be formed by an annular member 381 that is separate from the disk member 30. The annular member 381 is fitted onto the outer peripheral end 30t2. Therefore, the annular member 381 abuts against the outer peripheral end 30t2. This allows the annular member 381 to suppress displacement of the outer peripheral end 30t2 along the thickness direction TD. As a result, similar to the embodiment, the leaf spring 28 can effectively apply surface pressure to the pressed body across the entire disk member 30 as viewed in the thickness direction.

[0049] Moreover, the annular member 381 may extend from the disk member 30 to the plate-like member 26 along the second direction TD2. This allows the plate-like member 26 to be easily positioned by the annular portion 38 (annular member 381), as in the embodiment.

[0050] (Variation 2) The annular portion 38 may extend from the disk member 30 (outer peripheral end 30t2) to the first power feeder 22 along the second direction TD2. This allows the annular portion 38 to further surround the first power feeder 22. By having the first power feeder 22 surrounded by the annular portion 38, not only the positioning of the plate-like member 26 but also the positioning of the first power feeder 22 can be easily achieved.

[0051] According to the above embodiment and modified example, the leaf spring 28 can apply a surface pressure to the pressed body more effectively.

[0052] The following additional notes are provided regarding the above-described embodiment and modifications.

[0053] (Appendix 1) The leaf spring (28) according to the present disclosure comprises a disk member (30), and a plurality of claws (32) provided on the disk member and positioned between an outer peripheral end (30t2) of the disk member and an inner peripheral end (30t1) of the disk member, arranged along a circumferential direction (CD) of the disk member, each of which extends along a radial direction (RD) of the disk member and is curved in a thickness direction (TD) of the disk member. This reduces the variation in the surface pressure applied by the leaf spring to a pressed body.

[0054] (Appendix 2) In the leaf spring described in Supplementary Note 1, the disk member may have a first surface portion (30s1) facing a first direction (TD1) along the thickness direction and a second surface portion (30s2) facing a second direction (TD2) opposite to the first direction, and each of the plurality of claw portions may be warped in the first direction. This further reduces the variation in the surface pressure in the second direction that the leaf spring applies to the pressed body.

[0055] (Appendix 3) The leaf spring described in Appendix 2 may further include an annular portion (38) extending from the outer peripheral end along the second direction and surrounding the plurality of claws along the circumferential direction, thereby further reducing the variation in the surface pressure applied by the leaf spring to the pressed body.

[0056] (Appendix 4) In the leaf spring described in Supplementary Note 3, the annular portion may be integrated with the disk member. Such an annular portion can be formed while suppressing an increase in the number of parts of the leaf spring.

[0057] (Appendix 5) In the leaf spring described in Appendix 3, the annular portion may be formed by an annular member (381) that is separate from the disk member and abuts against the outer circumferential edge. This further reduces the variation in the surface pressure that the leaf spring applies to the pressed body.

[0058] (Appendix 6) In the leaf spring according to any one of Supplementary Notes 1 to 5, each of the plurality of claws has a base end (32b) that is an end in the radial direction and is connected to the disk member, and a tip end (32t) that is an end in the radial direction separate from the base end, and the plurality of claws may include outward claws (321) whose tip end is located radially outward of the disk member relative to the base end, and inward claws (322) whose tip end is located radially inward of the disk member relative to the base end, and the outward claws and the inward claws may be arranged alternately along the circumferential direction. This further reduces the variation in the surface pressure applied by the leaf spring to the pressed body.

[0059] (Appendix 7) In the leaf spring described in Supplementary Note 6, each of the plurality of claws may have a shape tapering from the base end toward the tip end, thereby further reducing the variation in the surface pressure that the leaf spring applies to the pressed body.

[0060] (Appendix 8) The leaf spring according to any one of Supplementary Notes 1 to 5 may include an inner claw group (361) consisting of the plurality of claws arranged in an annular shape along the circumferential direction, and an outer claw group (362) located radially outward of the disk member from the inner claw group and consisting of the plurality of claws arranged in an annular shape along the circumferential direction. This allows the leaf spring to apply a surface pressure to the pressed body more uniformly over the entire radial direction of the disk member.

[0061] (Appendix 9) In the leaf spring described in Appendix 8, at least one claw belonging to the inner claw group may be adjacent to a claw belonging to the outer claw group in the radial direction, thereby further reducing the radial variation in the surface pressure applied by the leaf spring to the pressed body.

[0062] (Appendix 10) In the leaf spring described in Supplementary Note 9, claws that are adjacent to claws belonging to the inner claw group along the radial direction and that belong to the outer claw group, and claws that are not adjacent to claws belonging to the inner claw group along the radial direction and that belong to the outer claw group, may be arranged alternately along the circumferential direction. This further reduces the radial variation in the surface pressure that the leaf spring applies to the pressed body.

[0063] (Appendix 11) 11. The leaf spring according to claim 10, wherein the claws belonging to the inner claw group are adjacent to each other along the radial direction. cormorant In addition, the claws belonging to the outer claw group may have a base end (32b) that is an end in the radial direction and is connected to the disk member, and a tip end (32t) that is an end in the radial direction different from the base end and is located radially inward of the disk member relative to the base end. This further reduces the radial variation in the surface pressure that the leaf spring applies to the pressed body.

[0064] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present disclosure. [Explanation of symbols]

[0065] 26...Plate-shaped member 28...Leaf spring 30...Disc member 30t1…Inner edge 30t2...Outer edge 30s1…First surface part 30s2…Second surface part 32...Claw portion (multiple claw portions) 32b...Proximal end 32t...Tip 34...hole 36...Claw group 38...Annular section 38g...Annular groove 38w…Inner wall part 321...Outward claw part 322...Inward claw part 361... Medial claw group 362...Outer claw group 381...Ring member

Claims

1. A disk member; a plurality of claws provided on the disk member, positioned between an outer peripheral end of the disk member and an inner peripheral end of the disk member, and arranged along a circumferential direction of the disk member; Equipped with each of the plurality of claw portions extends along a radial direction of the disk member and is warped in a thickness direction of the disk member; each of the plurality of claw portions has a base end portion that is an end portion in the radial direction and is connected to the disk member, and a tip portion that is an end portion different from the base end portion in the radial direction; A leaf spring in which the dimension of each of the plurality of claw portions in the circumferential direction decreases from the base end portion toward the tip end portion.

2. 2. The leaf spring according to claim 1, The disk member has a first surface portion facing a first direction along the thickness direction and a second surface portion facing a second direction that is a direction opposite to the first direction, Each of the plurality of claw portions is warped in the first direction.

3. 3. The leaf spring according to claim 2, a leaf spring including an annular portion extending from the outer peripheral end along the second direction and surrounding the plurality of claw portions along the circumferential direction;

4. 4. The leaf spring according to claim 3, The annular portion is integrally formed with the disk member.

5. 4. The leaf spring according to claim 3, The annular portion is a separate body from the disk member and is formed by an annular member that abuts against the outer peripheral end of the leaf spring.

6. A disk member, a plurality of claws provided on the disk member, positioned between an outer peripheral end of the disk member and an inner peripheral end of the disk member, and arranged along a circumferential direction of the disk member; Equipped with each of the plurality of claw portions extends along a radial direction of the disk member and is warped in a thickness direction of the disk member; each of the plurality of claw portions has a base end portion that is an end portion in the radial direction and is connected to the disk member, and a tip portion that is an end portion different from the base end portion in the radial direction; the plurality of claw portions include outward claw portions whose tip portions are located radially outward of the disk member relative to the base end portion, and inward claw portions whose tip portions are located radially inward of the disk member relative to the base end portion, The leaf spring, wherein the outward claw portions and the inward claw portions are alternately arranged along the circumferential direction.

7. 7. The leaf spring according to claim 6, Each of the plurality of claw portions has a shape that tapers from the base end toward the tip end of the leaf spring.

8. A disk member, a plurality of claws provided on the disk member, positioned between an outer peripheral end of the disk member and an inner peripheral end of the disk member, and arranged along a circumferential direction of the disk member; Equipped with each of the plurality of claw portions extends along a radial direction of the disk member and is warped in a thickness direction of the disk member; a leaf spring having an inner claw group consisting of the plurality of claws arranged in a ring shape along the circumferential direction, and an outer claw group located radially outward of the disk member from the inner claw group and consisting of the plurality of claws arranged in a ring shape along the circumferential direction.

9. 9. The leaf spring according to claim 8, At least one claw portion belonging to the inner claw portion group is adjacent to a claw portion belonging to the outer claw portion group along the radial direction.

10. 10. The leaf spring of claim 9, A leaf spring in which claw portions that belong to the outer claw group and that are adjacent to claw portions that belong to the inner claw group along the radial direction, and claw portions that are not adjacent to claw portions that belong to the inner claw group along the radial direction and that belong to the outer claw group, are alternately arranged along the circumferential direction.

11. 11. The leaf spring of claim 10, A leaf spring in which a claw portion belonging to the outer claw portion group and adjacent to a claw portion belonging to the inner claw portion group along the radial direction has a base end portion which is an end portion in the radial direction and is connected to the disk member, and a tip end portion which is an end portion different from the base end portion in the radial direction and is located radially inward of the disk member relative to the base end portion.

12. A unit cell provided in a water electrolysis stack, comprising: a first separator; a second separator; and a leaf spring disposed between the first separator and the second separator along a thickness direction; Equipped with The leaf spring is A disk member; a plurality of claws provided on the disk member, positioned between an outer peripheral end of the disk member and an inner peripheral end of the disk member, and arranged along a circumferential direction of the disk member; Equipped with Each of the plurality of claw portions extends along the radial direction of the disk member and is warped in the thickness direction of the unit cell.

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