Valve Structure

Abstract

To suppress shortage of grease at a sliding portion of a valve structure, or deposit of foreign substances or abrasion powder.SOLUTION: A valve structure is equipped with a housing that has an inflow path in which fluid flows, an outflow path from which the fluid flows out, and a valve body storage space that communicates the inflow path with the outflow path, and a valve body that moves along a center axis of the valve body storage space. The housing has a slid surface sliding with the valve body by the movement of the valve body, and the valve body has a sliding surface sliding with the slid surface by the movement of the valve body. Between the sliding surface and the slid surface, a grease is disposed. At least one of the sliding surface and the slid surface has a recessed / projecting structure, and the recessed / projecting structure has a plurality of recessed portion rows respectively configured of a plurality of recessed portion aligned in a circumferential direction about a center axis. The plurality of recessed portion rows is disposed so as to differ positions in a direction along the center axis from each other. One of the adjacent recessed portion rows adjacent has different recessed portions having different positions in the circumferential direction from the recessed portions configuring the other of the adjacent recessed portion rows.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a valve structure. [Background technology]

[0002] Patent Document 1 discloses a vibration-damping device that damps vibrations in machine tools such as NC lathes. The sliding part of this vibration-damping device is provided with an uneven structure for adjusting the friction coefficient of the sliding part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-076497 A Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have considered providing an uneven structure on the sliding portion of a valve, like the sliding portion of the vibration damping device in the above-mentioned document, and have found that there is room for improvement in the shape of the unevenness, since problems such as the inflow of foreign matter and localized lack of grease applied to the sliding portion can occur in the sliding portion of a valve. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one aspect of the present disclosure, there is provided a valve structure comprising: a housing having an inflow passage through which a fluid flows, an outflow passage through which the fluid flows out, and a cylindrical valve body accommodating space that connects the inflow passage and the outflow passage; and a valve body that is disposed in the valve body accommodating space and moves along a central axis of the valve body accommodating space. The housing has a sliding surface that slides against the valve body as the valve body moves, the valve body has a sliding surface that slides against the sliding surface as the valve body moves, grease is disposed between the sliding surface and the sliding surface, at least one of the sliding surface and the sliding surface has an uneven structure, the uneven structure has a plurality of recess rows each composed of a plurality of recesses lined up in a circumferential direction centered on the central axis, the plurality of recess rows are arranged at different positions from each other in a direction along the central axis, and one of adjacent recess rows of the plurality of recess rows has the recess that is at a different position in the circumferential direction from the recess constituting the other of the adjacent recess rows. According to this form of valve structure, the uneven structure provided on at least one of the sliding surface and the slidable surface has a plurality of recess rows each composed of a plurality of recesses arranged in a circumferential direction centered on the central axis of the valve body accommodating space, and one of the plurality of adjacent recess rows has a recess at a different circumferential position from the recess constituting the other adjacent recess row. Therefore, even if a local shortage of grease occurs between the sliding surface and the slidable surface, the valve body can move along the central axis to supply grease that has entered the recesses to the area where grease is lacking, and further, the valve body can move along the central axis to collect foreign matter and wear powder in the recesses. (2) In the valve structure of the above embodiment, the uneven structure may be configured such that, when all of the recesses are projected onto a projection plane perpendicular to the central axis, a projected image obtained by projecting all of the recesses onto the projection plane is connected in a ring shape without interruption in the circumferential direction. According to the valve structure of this embodiment, it is possible to prevent the leakage of grease from the recess to a portion where grease is scarce, and the leakage of foreign matter and wear powder from being collected in the recess. (3) The valve structure of the above aspect may include a filter disposed in the inflow passage, and a width of the recess along the circumferential direction may be wider than a maximum width of the mesh of the filter. According to the valve structure of this embodiment, foreign matter that has passed through the filter can be easily collected in the recess. (4) In the valve structure of the above aspect, the depth of the recess may be greater than the maximum width of the mesh of the filter. According to the valve structure of this embodiment, it is possible to prevent the recess from being filled with a single foreign object, and therefore the recess is less likely to lose its function of collecting foreign objects due to the recess being filled with foreign objects. (5) The valve structure of the above aspect may include an elastic member that biases the valve body from the valve body accommodating space toward the inflow passage. With this type of valve structure, chattering, in which the valve body biased by the elastic member vibrates along the central axis due to a lack of grease or the adhesion of foreign matter or wear powder to the sliding surface or slidable surface, can be suppressed. The present disclosure may be realized in various forms other than a valve structure, for example, a check valve. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is an explanatory diagram illustrating a schematic configuration of a valve structure according to the first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the configuration of a check valve portion according to the first embodiment. [Diagram 3] FIG. 1 is a first explanatory diagram showing the configuration of a concave-convex structure according to a first embodiment. [Figure 4] FIG. 2 is a second explanatory diagram showing the configuration of the concave-convex structure of the first embodiment. [Diagram 5] FIG. 4 is a third explanatory diagram showing the configuration of the concave-convex structure of the first embodiment. [Figure 6] 4 is a cross-sectional view showing the opening and closing state of the check valve portion of the first embodiment. FIG. [Figure 7] FIG. 11 is an explanatory diagram showing the configuration of a concave-convex structure according to a second embodiment. [Figure 8] FIG. 11 is an explanatory diagram showing the configuration of a concave-convex structure according to a third embodiment. [Figure 9] FIG. 13 is an explanatory diagram showing the configuration of a concave-convex structure according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A. First embodiment: FIG. 1 is an explanatory diagram showing a schematic configuration of a valve structure 300 in a first embodiment. In this embodiment, the valve structure 300 is provided in a fuel cell vehicle 10 equipped with a hydrogen tank 200 and a fuel cell 400. The valve structure 300 is fixed to a base provided at an end of the hydrogen tank 200. A hydrogen fill port 100 is provided on the body of the fuel cell vehicle 10. A hydrogen supply device installed in, for example, a hydrogen station is connected to the hydrogen fill port 100. The hydrogen fill port 100 is connected to the valve structure 300 via a first pipe 110. The valve structure 300 is connected to the fuel cell 400 via a second pipe 410.

[0009] The valve structure 300 has a first inflow passage 310, a filter 315, a check valve section 350, a first outflow passage 320, a second inflow passage 330, an on-off valve section 360, and a second outflow passage 340. The first inflow passage 310 communicates the first pipe 110 with the check valve section 350. The filter 315 is provided in the first inflow passage 310 and collects foreign matter that has flowed in from the hydrogen filling port 100. The filter 315 is, for example, a metal or resin mesh filter. The check valve section 350 has a function of guiding hydrogen gas that has flowed into the first inflow passage 310 to the first outflow passage 320 and a function of preventing hydrogen gas from flowing back from the first outflow passage 320 to the first inflow passage 310. The first outflow passage 320 communicates the check valve section 350 with the hydrogen tank 200.

[0010] The second inflow path 330 communicates between the hydrogen tank 200 and an on-off valve unit 360. The on-off valve unit 360 has a function of starting and stopping the inflow of hydrogen gas from the second inflow path 330 to the second outflow path 340. The on-off valve unit 360 is configured as an electromagnetic valve driven by a solenoid, for example. The second outflow path 340 communicates between the on-off valve unit 360 and the second pipe 410.

[0011] Hydrogen gas supplied to the hydrogen filling port 100 flows through the first piping 110, the first inflow channel 310, the check valve section 350, and the first outflow channel 320 in this order, and is stored in the hydrogen tank 200. The hydrogen gas stored in the hydrogen tank 200 flows through the second inflow channel 330, the on-off valve section 360, the second outflow channel 340, and the second piping 410 in this order, and is supplied to the fuel cell 400.

[0012] 2 is a cross-sectional view showing the configuration of the check valve portion 350 in this embodiment. The check valve portion 350 in this embodiment includes a housing 20, a valve body 60, and a spring 70. The housing 20 has a valve body accommodating space 41. In this embodiment, the valve body accommodating space 41 is configured in a cylindrical shape centered on a central axis CL1. In the following description, the direction along the central axis CL1 of the valve body accommodating space 41 is called the axial direction AD, the direction along the radius of the circle centered on the central axis CL1 of the valve body accommodating space 41 is called the radial direction RD, and the direction along the circumference of the circle centered on the central axis CL1 of the valve body accommodating space 41 is called the circumferential direction CD.

[0013] The housing 20 has an inlet hole 31 and a valve seat 35 at one end of the inner wall surface surrounding the valve body accommodating space 41. The inlet hole 31 constitutes an end of the first inlet passage 310. The valve seat 35 is provided so as to surround the opening of the inlet hole 31. The housing 20 has an outflow hole 51 and a spring support surface 55 at the other end of the inner wall surface surrounding the valve body accommodating space 41. The outflow hole 51 constitutes an end of the first outflow passage 320. In this embodiment, the spring support surface 55 is provided so as to surround the opening of the inflow hole 31.

[0014] The housing 20 has a sliding surface 45 on the inner wall surface surrounding the valve body accommodating space 41. The sliding surface 45 is a surface that slides on the valve body 60. The sliding does not only mean that one object slides on the other object when the object is in direct contact with the other object, but also means that one object slides on the other object when the object is in contact with the other object via a lubricant such as grease. In this embodiment, the sliding surface 45 is provided on the side of the inner wall surface surrounding the valve body accommodating space 41. That is, in this embodiment, the sliding surface 45 is configured in a cylindrical shape centered on the central axis CL1 of the valve body accommodating space 41.

[0015] In this embodiment, the housing 20 is configured by combining a plurality of members including a first member 30, a second member 40, and a third member 50. The second member 40 is provided with a through hole. The first member 30 is disposed so as to close one end of the through hole of the second member 40, and is fixed to the second member 40 by press-fitting. The third member 50 is disposed so as to close the other end of the through hole of the second member 40, and is fixed to the second member 40 by press-fitting. The first member 30 and the third member 50 are fixed to the second member 40 to form a valve body accommodating space 41. The sliding surface 45 is provided in the second member 40. The inlet hole 31 and the valve seat 35 are provided in the first member 30. The outlet hole 51 and the spring support surface 55 are provided in the third member 50. In this embodiment, the second member 40 and the third member 50 are made of an aluminum alloy, and the first member 30 is made of an ester-based resin material.

[0016] The valve body 60 is disposed in the valve body accommodating space 41. The valve body 60 is configured in an axial shape centered on a central axis CL2. The valve body 60 is disposed in the valve body accommodating space 41 such that the central axis CL2 of the valve body 60 overlaps with the central axis CL1 of the valve body accommodating space 41. The valve body 60 can move along the central axis CL1 of the valve body accommodating space 41. When the tip portion 61 of the valve body 60 comes into contact with the valve seat 35, the inlet hole 31 is closed. When the tip portion 61 of the valve body 60 moves away from the valve seat 35, the inlet hole 31 is opened.

[0017] The valve body 60 has a sliding surface 65. The sliding surface 65 is a surface of the outer wall surface of the valve body 60 that slides against the slidable surface 45. In this embodiment, the sliding surface 65 is provided in an expanded diameter portion between the front end portion 61 and the rear end portion 62 of the valve body 60, and is configured in a cylindrical shape centered on the central axis CL2 of the valve body 60. The diameter of the sliding surface 65 is smaller than the diameter of the slidable surface 45 by, for example, several tens of micrometers to several hundreds of micrometers.

[0018] The valve body 60 is hollow except for the tip portion 61, thereby providing an internal flow path 68. A communication hole 69 that communicates the valve body accommodating space 41 with the internal flow path 68 is provided in the side portion of the valve body 60 between the tip portion 61 and the sliding surface 65. In this embodiment, the valve body 60 is made of stainless steel.

[0019] The spring 70 is disposed in the valve body accommodating space 41. The spring 70 expands and contracts along the central axis CL1 of the valve body accommodating space 41. The spring 70 biases the valve body 60 from the valve body accommodating space 41 toward the inlet hole 31. That is, the spring 70 biases the valve body 60 toward the valve seat 35. In this embodiment, the spring 70 is a compression coil spring. One end of the spring 70 contacts a step portion provided between the sliding surface 65 and the rear end portion 62 of the valve body 60, and the other end of the spring 70 contacts the spring support surface 55. The spring 70 may be referred to as an elastic member. In other embodiments, the valve body 60 may be biased toward the valve seat 35 by an elastic member formed of, for example, an elastomer instead of the spring 70.

[0020] FIG. 3 is a first explanatory diagram showing the configuration of the uneven structure 90 in this embodiment. FIG. 4 is a second explanatory diagram showing the configuration of the uneven structure 90 in this embodiment. FIG. 5 is a third explanatory diagram showing the configuration of the uneven structure 90 in this embodiment. FIG. 3 shows a partial enlarged view of the P portion surrounded by the two-dot chain line in FIG. 2. As shown in FIG. 3, in this embodiment, the sliding surface 65 of the valve body 60 is provided with an uneven structure 90. The uneven structure 90 is provided over the entire sliding surface 65. The uneven structure 90 has a plurality of recesses 95 and a protrusion 96 separating the recesses 95 from each other. The sliding surface 45 of the housing 20 is not provided with unevenness, and the sliding surface 45 is configured as a smooth surface. The uneven structure 90 is sometimes called surface texturing.

[0021] FIG. 4 shows a partial enlarged view of the P portion seen from a different direction from FIG. 3. In this embodiment, each recess 95 is configured as a cylindrical recess having a central axis along the radial direction RD. The diameter D of each recess 95 is larger than the maximum width of the mesh of the filter 315 arranged upstream of the check valve portion 350. The depth H of each recess 95 shown in FIG. 3 is larger than the maximum width of the mesh of the filter 315. As described later, in order to easily collect foreign matter that has passed through the filter 315 in the recess 95, the diameter D of each recess 95 is preferably at least twice the maximum width of the mesh of the filter 315, and the depth H of each recess 95 is preferably at least twice the maximum width of the mesh of the filter 315.

[0022] As shown in FIG. 4, the concave-convex structure 90 has a plurality of recess rows 91. In this embodiment, for example, the concave-convex structure 90 has several to several thousand recess rows 91. Each recess row 91 is composed of a plurality of recesses 95 arranged along the circumferential direction CD. Each recess row 91 is arranged at a different position from each other in the axial direction AD. One of the adjacent recess rows 91 has a recess 95 whose position in the circumferential direction CD is different from that of the recess 95 constituting the other adjacent recess row 91. In this embodiment, in each recess row 91, each recess 95 is arranged at equal intervals. In each recess row 91, the pitch L1 of adjacent recesses 95 is three times the diameter D of the recess 95. The valve body 60 can move along the axial direction AD by three times or more the pitch L2 of the recess row 91.

[0023] In this embodiment, a plurality of depressions are formed on the sliding surface 65 of the valve body 60 by laser processing, thereby forming the uneven structure 90. The portions where the depressions are formed are the recesses 95, and the portions where no depressions are formed are the protrusions 96. Note that in other embodiments, the uneven structure 90 may be formed on the sliding surface 65 by providing the unevenness on a mold for manufacturing the valve body 60, and transferring the unevenness provided on the mold to the valve body 60 during the manufacturing of the valve body 60.

[0024] 5 shows projection images PJ1 to PJ3, PJA of the recesses 95 projected on a projection surface SC perpendicular to the axial direction AD. In FIG. 5, a projection image PJ1 of the recesses 95 obtained by projecting the first recessed row 91 from the tip 61 side of the valve body 60 onto the projection surface SC, a projection image PJ2 of the recesses 95 obtained by projecting the second recessed row 91 onto the projection surface SC, a projection image PJ3 of the recesses 95 obtained by projecting the third recessed row 91 onto the projection surface SC, and a projection image PJA of the recesses 95 obtained by projecting all the recessed row 91 onto the projection surface SC are shown. In this embodiment, the concave-convex structure 90 is configured such that when all the recesses 95 are projected onto the projection surface SC perpendicular to the axial direction AD, the projection image PJA obtained by projecting all the recesses 95 onto the projection surface SC is connected in a ring shape without interruption in the circumferential direction CD.

[0025] As shown in FIG. 3, grease 80 is disposed between the sliding surface 65 and the slidable surface 45. In this embodiment, the grease 80 is applied to the sliding surface 65, and the sliding surface 65 slides on the slidable surface 45 via the grease 80. In this embodiment, the grease 80 is applied to the sliding surface 65 prior to the insertion of the valve body 60 into the valve body accommodating space 41. After the valve body 60 with the grease 80 applied to the sliding surface 65 is inserted into the valve body accommodating space 41, a break-in operation is performed in which the valve body 60 is pressed against the spring 70, for example, several times. After the break-in operation is completed, the grease 80 covers the convex portion 96 and enters each concave portion 95. In this embodiment, as described below, the valve body 60 moves along the axial direction AD, so that the grease 80 that has entered the recess 95 can be supplied to the portion where the grease 80 is lacking, and this simplifies the management of the film thickness of the grease 80 when applying the grease 80 to the sliding surface 65. In this embodiment, the grease 80 is a fluorine-based grease. Note that in other embodiments, the grease 80 may be, for example, a silicone-based grease or an ester-based grease instead of a fluorine-based grease.

[0026] Fig. 6 is a cross-sectional view showing the opening and closing of the check valve section 350 in this embodiment. As shown in Fig. 2, when hydrogen gas is not being supplied to the hydrogen filling port 100, the tip 61 of the valve body 60 is in contact with the valve seat 35. In the check valve section 350, the state in which the tip 61 of the valve body 60 is in contact with the valve seat 35 is referred to as the closed valve state.

[0027] When the supply of hydrogen gas to the hydrogen filling port 100 is started, the hydrogen gas flows through the first pipe 110 and the first inlet passage 310 in this order. Any foreign matter mixed in the hydrogen gas is collected by a filter 315 provided in the first inlet passage 310. When the force of the hydrogen gas pushing the valve body 60 from the tip 61 to the rear end 62 of the valve body 60 exceeds the resultant force of the frictional force acting between the sliding surface 65 of the valve body 60 and the sliding surface 45 of the housing 20 and the force of the spring 70 pressing the valve body 60 against the valve seat 35, the tip 61 of the valve body 60 separates from the valve seat 35, and the hydrogen gas flows into the valve body accommodating space 41, as shown in FIG. 6. As shown by the dashed line in FIG. 6, the hydrogen gas that has flowed into the valve body accommodating space 41 flows through the communication hole 69 and the internal flow path 68 provided in the valve body 60 in this order, and flows from the outflow hole 51 to the hydrogen tank 200. In addition, in the check valve portion 350, a state in which the tip portion 61 of the valve body 60 is separated from the valve seat 35 is referred to as an open state.

[0028] When the supply of hydrogen gas to the hydrogen filling port 100 is stopped, the valve body 60 is pushed back by the spring 70, and the tip 61 of the valve body 60 comes into contact with the valve seat 35, as shown in Fig. 2. This prevents hydrogen gas from flowing back from the hydrogen tank 200 to the first pipe 110 or the hydrogen filling port 100. In this embodiment, the sliding surface 65 is provided with an uneven structure 90, so that the frictional force acting between the sliding surface 65 and the slidable surface 45 can be reduced by the fluid dynamic pressure effect.

[0029] According to the valve structure 300 in the present embodiment described above, the sliding surface 65 of the valve body 60 of the check valve portion 350 is provided with the concave-convex structure 90, and the concave-convex structure 90 has a plurality of recessed rows 91 arranged at different positions in the axial direction AD. Each recessed row 91 is composed of a plurality of recessed rows 95 arranged along the circumferential direction CD, and the recessed rows 91 adjacent to each other are arranged with the positions of the recessed rows 95 in the circumferential direction CD different from each other. Therefore, even if a local shortage of the grease 80 occurs between the sliding surface 65 and the sliding surface 45, the valve body 60 moves along the axial direction AD, so that the grease 80 that has entered the recessed sections 95 can be supplied to the portion where the grease 80 is lacking. Furthermore, in the valve structure 300, foreign matter that has passed through the filter 315 may enter between the sliding surface 65 and the sliding surface 45, and wear powder may be generated due to wear of the sliding surface 65 or the sliding surface 45. In this embodiment, adjacent recess rows 91 are arranged such that the positions of the recesses 95 in the circumferential direction CD are different from each other, so that foreign matter and wear powder remaining on the convex portions 96 can be collected in the recesses 95 by moving the valve body 60 along the axial direction AD. This makes it possible to suppress an increase in the frictional force acting between the sliding surface 65 and the slidable surface 45 due to a lack of grease 80 or the retention of foreign matter and wear powder, thereby improving the durability of the check valve portion 350.

[0030] In this embodiment, the concave-convex structure 90 is configured such that, when all the recesses 95 are projected onto a projection plane SC perpendicular to the axial direction AD, the projection images PJA obtained by projecting all the recesses 95 onto the projection plane SC are connected in an annular shape without interruption in the circumferential direction CD. This makes it possible to suppress leakage of the grease 80 from the recesses 95 to a portion where the grease 80 is scarce, and leakage of foreign matter and wear powder into the recesses 95.

[0031] In this embodiment, the uneven structure 90 is configured so that the diameter D of each recess 95 is at least twice the maximum width of the mesh of the filter 315. Therefore, even if a foreign object passes through the filter 315, the foreign object can be easily captured in the recess 95.

[0032] In this embodiment, the uneven structure 90 is configured so that the depth H of each recess 95 is at least twice the maximum width of the mesh of the filter 315. This prevents a single foreign object from filling up the recess 95 and causing the recess 95 to lose its function of capturing foreign objects.

[0033] In this embodiment, the spring 70 biases the valve body 60 toward the valve seat 35. When the force of the hydrogen gas pushing the valve body 60 and the resultant force of the frictional force acting between the sliding surface 65 and the slidable surface 45 and the force of the spring 70 pushing back the valve body 60 are in opposition to each other, the valve body 60 is likely to vibrate along the axial direction AD and repeatedly collide with the valve seat 35, causing chattering. When the grease 80 is evenly applied to the sliding surface 65, chattering is likely to occur when the force of the hydrogen gas pushing the valve body 60 is relatively small, that is, when the flow rate of the hydrogen gas supplied to the hydrogen filling port 100 is relatively small. However, when the grease 80 is locally deficient or when foreign matter or wear powder adheres to the sliding surface 65 or the slidable surface 45, the frictional force that the sliding surface 65 receives from the slidable surface 45 increases, so the lower limit of the flow rate of hydrogen gas at which chattering occurs becomes higher, making chattering more likely to occur. In this embodiment, as described above, it is possible to suppress an increase in the frictional force acting between the sliding surface 65 and the sliding surface 45 due to a lack of grease 80 or the adhesion of foreign matter or wear powder to the sliding surface 65 or the sliding surface 45, thereby suppressing the likelihood of chattering occurring.

[0034] B. Second embodiment: 7 is an explanatory diagram showing the configuration of the concave-convex structure 90b in the second embodiment. The second embodiment differs from the first embodiment in that the opening shape of each recess 95b of the concave-convex structure 90b is not circular but elliptical with a longitudinal direction along the circumferential direction CD. The other configurations are the same as those of the first embodiment unless otherwise specified.

[0035] This uneven structure 90b can also suppress an increase in the frictional force acting between the sliding surface 65 and the slidable surface 45 due to a lack of grease 80 or the accumulation of foreign matter or wear powder, thereby suppressing chattering from occurring. Note that the width Wa of the recess 95b in the axial direction AD and the width Wc of the recess 95b in the circumferential direction CD are preferably at least twice the maximum width of the mesh of the filter 315. Note that in other embodiments, the opening shape of each recess 95b may be an ellipse having a longitudinal direction along the axial direction AD instead of an ellipse having a longitudinal direction along the circumferential direction CD.

[0036] C. Third embodiment: 8 is an explanatory diagram showing the configuration of a concave-convex structure 90c in the third embodiment. The third embodiment is different from the first embodiment in that the opening shape of the recess 95c of the concave-convex structure 90c is not circular but rectangular. The other configurations are the same as those of the first embodiment unless otherwise specified.

[0037] This uneven structure 90c can also suppress an increase in the frictional force acting between the sliding surface 65 and the slidable surface 45 due to a lack of grease 80 or the accumulation of foreign matter or wear powder, thereby suppressing the likelihood of chattering. Note that the width Wa of the recess 95c in the axial direction AD and the width Wc of the recess 95c in the circumferential direction CD are preferably at least twice the maximum width of the mesh of the filter 315.

[0038] D. Fourth embodiment: 9 is an explanatory diagram showing the configuration of a concave-convex structure 90d in the fourth embodiment. The fourth embodiment differs from the first embodiment in that the opening shape of the concave-convex structure 90d is triangular rather than circular. The other configurations are the same as those of the first embodiment unless otherwise specified.

[0039] This uneven structure 90d can also suppress an increase in the frictional force acting between the sliding surface 65 and the slidable surface 45 due to a lack of grease 80 or the accumulation of foreign matter or wear powder, thereby suppressing chattering from occurring. Note that the width Wa of the recess 95d in the axial direction AD and the width Wc of the recess 95d in the circumferential direction CD are preferably at least twice the maximum width of the mesh of the filter 315. When the opening shape of the recess 95d is triangular as in this embodiment, it is more preferable that the diameter of the inscribed circle of the triangle is at least twice the maximum width of the mesh of the filter 315.

[0040] E. Other embodiments: (E1) In the valve structure 300 of each of the above-described embodiments, the concave-convex structures 90-90d are provided on the sliding surface 65 of the valve body 60. Alternatively, the concave-convex structures 90-90d may be provided on the sliding surface 45 of the housing 20. Even in this case, an increase in the frictional force acting between the sliding surface 65 and the sliding surface 45 due to a lack of grease 80 or the accumulation of foreign matter or wear powder can be suppressed, so that chattering can be suppressed from occurring easily. Moreover, the concave-convex structures 90-90d may be provided on both the sliding surface 65 and the sliding surface 45. For example, the portion of the sliding surface 65 facing the inlet hole 31 may be provided with an uneven structure 90-90d, the portion of the sliding surface 65 facing the outlet hole 51 may be smoothly constructed, the portion of the slidable surface 45 facing the uneven structure 90-90d of the sliding surface 65 may be smoothly constructed, and the portion of the slidable surface 45 not facing the uneven structure 90-90d of the sliding surface 65 may be provided with the uneven structure 90-90d.

[0041] (E2) In the valve structure 300 of each of the above-described embodiments, the concave-convex structure 90-90d is configured such that, when all the recesses 95-95d are projected onto a projection plane SC perpendicular to the axial direction AD, the projection images PJA obtained by projecting all the recesses 95-95d onto the projection plane SC are connected in an uninterrupted ring shape in the circumferential direction CD. In contrast, the concave-convex structure 90-90d does not have to be configured such that, when all the recesses 95-95d are projected onto a projection plane SC perpendicular to the axial direction AD, the projection images PJA obtained by projecting all the recesses 95-95d onto the projection plane SC are connected in an uninterrupted ring shape in the circumferential direction CD.

[0042] (E3) In the valve structure 300 of each of the above-described embodiments, the diameter D of the recess 95 and the width Wc of the recesses 95b-95d in the circumferential direction CD are at least twice the maximum width of the mesh of the filter 315. In contrast, the diameter D of the recess 95 may be less than twice the maximum width of the mesh of the filter 315, and the width Wc of the recesses 95b-95d in the circumferential direction CD may be less than twice.

[0043] (E4) In the valve structure 300 of each of the above-described embodiments, the depth H of the recesses 95-95d is equal to or greater than twice the maximum width of the mesh of the filter 315. In contrast, the depth H of the recesses 95-95d may be less than twice the maximum width of the mesh of the filter 315.

[0044] (E5) In the valve structure 300 of each of the above-described embodiments, the filter 315 is provided in the first inflow passage 310. However, the filter 315 does not necessarily have to be provided in the first inflow passage 310.

[0045] (E6) In the valve structure 300 of each of the above-described embodiments, the valve body 60 is biased toward the valve seat 35 by the spring 70. In contrast, the valve body 60 does not have to be biased toward the valve seat 35 by an elastic member such as the spring 70. For example, the valve body 60 may be configured to move along the axial direction AD by a motor. In this case, chattering is not an issue, but an increase in the frictional force acting between the sliding surface 65 and the slidable surface 45 due to the accumulation of foreign matter or wear powder can be suppressed, thereby reducing the power consumption of the motor.

[0046] (E7) The valve structure 300 in each of the above-described embodiments includes a first inflow passage 310, a check valve portion 350, a first outflow passage 320, a second inflow passage 330, an on-off valve portion 360, and a second outflow passage 340. In contrast, the valve structure 300 does not necessarily have to include the second inflow passage 330, the on-off valve portion 360, and the second outflow passage 340.

[0047] (E8) In each of the above-described embodiments, hydrogen gas flows inside the valve structure 300. However, a fluid other than hydrogen gas may also flow inside the valve structure 300.

[0048] (E9) In each of the above-described embodiments, the uneven structure 90-90d is provided on the check valve portion 350 of the valve structure 300 provided on the nozzle of the hydrogen tank 200. In contrast to this, for example, a check valve may be provided in the hydrogen filling port 100, and an uneven structure similar to the uneven structure 90-90d may be provided on the sliding surface of the valve body of this check valve, or on the sliding surface of the housing that accommodates the valve body.

[0049] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0050] 10... fuel cell vehicle, 20... housing, 30... first member, 31... inlet hole, 35... valve seat, 40... second member, 41... valve body accommodating space, 45... sliding surface, 50... third member, 51... outlet hole, 55... spring support surface, 60... valve body, 61... tip portion, 62... rear end portion, 65... sliding surface, 68... internal flow path, 69... communication hole, 70... spring, 80... grease, 90 ...concave-convex structure, 91...row of concaves, 95...concave, 96...convex, 100...hydrogen filling port, 110...first piping, 200...hydrogen tank, 300...valve structure, 310...first inlet passage, 315...filter, 320...first outlet passage, 330...second inlet passage, 340...second outlet passage, 350...check valve section, 360...opening / closing valve section, 400...fuel cell, 410...second piping

Claims

1. A valve structure comprising: a housing having an inflow passage through which a fluid flows, an outflow passage through which the fluid flows out, and a cylindrical valve body accommodating space that connects the inflow passage and the outflow passage; a valve body disposed in the valve body accommodating space and movable along a central axis of the valve body accommodating space; A filter disposed in the inlet passage; Equipped with the housing has a sliding surface that slides against the valve body as the valve body moves, the valve body has a sliding surface that slides against the slidable surface as the valve body moves, Grease is disposed between the sliding surface and the slidable surface, At least one of the sliding surface and the slidable surface has an uneven structure, the concave-convex structure has a plurality of recess rows each formed of a plurality of recesses arranged in a circumferential direction around the central axis, the plurality of recessed portion rows are arranged at different positions in a direction along the central axis, one of the plurality of recessed portion rows adjacent to each other has a recess that is located at a different position in the circumferential direction from a recess that constitutes another of the adjacent recessed portion rows; The width of the recess along the circumferential direction is wider than the maximum width of the mesh of the filter. Valve structure.

2. 2. The valve structure of claim 1, The uneven structure is configured such that, when all of the recesses are projected onto a projection plane perpendicular to the central axis, the projected image obtained by projecting all of the recesses onto the projection plane is connected in an uninterrupted ring shape in the circumferential direction.

3. The valve structure according to claim 1 or 2, A valve structure, wherein the depth of the recess is greater than the maximum width of the mesh of the filter.

4. The valve structure according to any one of claims 1 to 3, A valve structure including an elastic member that biases the valve body from the valve body accommodating space toward the inlet passage.

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