JP2015140869A - seal material and seal mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal material having low slide resistance and high sealability and excellent in durability, and a seal mechanism.SOLUTION: In order to seal the gap between a pore 22a and a shaft 23 inserted into the pore 22a, a ring seal material 10 is press-fitted into a seal material storage recess part 22 formed in a shaft insertion port 50. The seal material 10 comprises an elastic material where a slide layer 30, where a fiber and an elastomer are integrated, is provided at least on an inner peripheral surface side, and on the outer peripheral surface thereof, a plurality of recess parts 14 and projection parts 15 are alternately arranged side by side. A maximum outer diameter R1 passing through the tip part of the projection part 15 is larger than an inner diameter R2 of the seal material storage recess part 22.

Description

  The present invention relates to a sealing material and a sealing mechanism for sealing between a hole and a shaft inserted into the hole.

  As a sealing material that seals a rotating shaft of a device that handles powder such as toner and prevents leakage of the powder, Patent Document 1 discloses that a pile or a fiber sheet is formed in a cylindrical shape, and its outer peripheral side is restrained by a metal support member. A cylindrical sealing member is disclosed. Since this cylindrical sealing member presses the periphery of the shaft with an appropriate compressive force with piles or fibers, it is possible to balance the sliding resistance and the sealing performance.

JP 2008-26728 A

  However, the cylindrical sealing member has a problem that piles and fibers have low durability, and further, when the powder enters between the piles and fibers, the sealing performance is deteriorated, so that it cannot be used for a device used for a long time. .

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sealing material and a sealing mechanism that have both low sliding resistance and high sealing performance and are excellent in durability.

As a result of intensive studies to solve the above problems, the present inventors have completed the present invention. That is, the present invention has the following configuration.
(1) A ring-shaped sealing material that is press-fitted into a shaft insertion opening or a sealing material housing recess formed outside the shaft insertion hole in order to seal between the hole and a shaft inserted into the hole. The elastic member is provided with a sliding layer in which fibers and elastomer are integrated at least on the inner peripheral surface side, and a plurality of concave portions and convex portions are alternately arranged along the circumferential direction on the outer peripheral surface. The sealing material is characterized in that, in a cross section of the sealing material orthogonal to the axial direction of the shaft, the maximum outer diameter passing through the tip of the convex portion is larger than the inner diameter of the sealing material accommodating concave portion.
(2) The sealing material according to (1), wherein the sealing material accommodation recess is formed in a shaft insertion port, communicates with the hole, and has an inner diameter larger than a diameter of the hole.
(3) The sealing material according to (1), wherein the sealing material accommodation recess is formed on a surface facing the shaft insertion port in a sealing material holding member attached to the outside of the shaft insertion port.
(4) The sealing material according to any one of (1) to (3), wherein the plurality of concave portions and convex portions are regularly formed in a circumferential direction of the sealing material.
(5) In the cross section of the sealing material orthogonal to the axial direction of the shaft, the shape of the outer periphery is a regular polygon in which each vertex portion is a convex portion, and a side region connecting adjacent vertex portions is a concave portion. The sealing material according to (4).
(6) Any of (1) to (5), wherein the elastic material includes a sliding layer in which fibers and an elastomer are integrated, and an elastic skin layer provided on an outer peripheral surface of the sliding layer. Seal material according to crab.
(7) The sealing material according to any one of (1) to (5), wherein the sliding layer is made of an elastomer in which short fibers are dispersed.
(8) A seal mechanism that seals between a hole and a shaft inserted into the hole with a seal material, and the seal material is a slide in which fibers and an elastomer are integrated at least on the inner peripheral surface side In the cross-section of the sealing material perpendicular to the axial direction of the shaft, a plurality of concave portions and convex portions are alternately arranged along the circumferential direction on the outer peripheral surface. The maximum diameter passing through the tip of the convex portion is formed larger than the inner diameter of the sealing material accommodation recess, and the sealing material accommodation recess is installed at the shaft insertion port of the hole or at the front surface thereof. A sealing mechanism characterized in that, in a state in which a sealing material is press-fitted into a concave portion, a tip end portion of the convex portion comes into contact with an inner peripheral surface of the sealing material accommodation concave portion and is compressed and deformed.
(9) A sealing mechanism that seals between a hole and a shaft inserted into the hole with a sealing material, wherein the sealing material has fibers and an elastomer integrated at least on the inner peripheral surface side A plurality of concave portions and convex portions are alternately arranged along the circumferential direction on the inner peripheral surface of the sealing material containing concave portion, and are formed in the axial direction of the shaft. In the cross-section of the orthogonal sealant accommodating recess, the minimum diameter passing through the tip of the convex part is formed smaller than the outer diameter of the sealant, and the sealant accommodating recess is formed at the shaft insertion port of the hole or the front surface In the state where the sealing material is press-fitted into the sealing material accommodation recess, the outer peripheral surface of the sealing material is in contact with the tip of the convex portion of the sealing material accommodation recess and is compressed and deformed. A sealing mechanism characterized by
In addition, the shaft in the present invention includes a case where the shaft rotates around its central axis or moves along the axial direction of the shaft (such as reciprocation). It includes the case of rotating with respect to the shaft or moving along the axial direction of the shaft.

  In the sealing material of the present invention, the sliding resistance with respect to the shaft is lowered by the sliding layer in which the fiber and the elastomer are integrated, and the maximum outer diameter of the plurality of convex portions provided on the outer peripheral surface is equal to that of the sealing material accommodating concave portion. Since the seal material is larger than the inner diameter, by interposing the seal material between the outer peripheral surface of the shaft and the inner peripheral surface of the seal material accommodation recess, for example, when the seal material into which the shaft is fitted is pressed into the seal material accommodation recess, A compressive stress acts on the material, gives an appropriate pressing force to the outer peripheral surface of the shaft, and can ensure high sealing performance. Moreover, the sliding layer in which the fiber and the elastomer are integrated is excellent in durability against sliding wear.

It is a perspective view which shows the sealing member which concerns on one Embodiment of this invention. It is a schematic sectional drawing which shows the sealing mechanism which concerns on one Embodiment of this invention. (A) is a disassembled perspective view of the sealing material, shaft, and structure which concern on one Embodiment of this invention, (b) demonstrates the relationship between the sealing material and sealing material accommodation recessed part which are shown to (a). It is a schematic front view for. It is a schematic front view of the circumscribed circle of the sealing material for demonstrating an area ratio. (A)-(e) is a front view which shows the various shapes of the sealing member in this invention. (A) is a disassembled perspective view of the sealing material, shaft, and structure which concern on other embodiment of this invention, (b) demonstrates the relationship between the sealing material and sealing material accommodation recessed part which are shown to (a). It is a schematic front view for doing. It is a schematic front view of the circumscribed circle of the sealing material accommodation recessed part for demonstrating an area ratio. It is a schematic sectional drawing which shows the seal mechanism which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[One Embodiment of the Present Invention]
FIG. 1 shows a sealing material 10 according to an embodiment of the present invention. As shown in the figure, the sealing material 10 is ring-shaped, has a through hole 12 in the center, and has an outer periphery that is a regular octagon. In this regular octagonal sealing material 10, each apex portion of the regular octagon forms a convex portion 15, and a side region connecting adjacent vertex portions becomes a concave portion 14. Here, the convex portion 15 is a portion that comes into contact with the inner peripheral surface of the sealing material accommodation concave portion 22 when the sealing material 10 is press-fitted into the sealing material accommodation concave portion 22, and the concave portion 14 is a gap portion described later, that is, When the sealing material 10 is press-fitted into the sealing material accommodating recess 22, it is a part that forms a clearance for the sealing material 10.
Furthermore, the sealing material 10 has a sliding layer 30 formed on the inner peripheral surface of the through-hole 12, and other portions including the concave portion 14 and the convex portion 15 are made of an elastic skin layer 31, that is, the sliding layer 30 and the elastic outer layer. It is a laminated body in which the skin layer 31 is laminated in this order toward the outer periphery.

As shown in FIG. 2, the sealing material 10 includes an inner peripheral surface of the sealing material accommodation recess 22 formed in the shaft insertion port 50 of the structure 21, and an outer peripheral surface of the shaft 23 inserted through the sealing material accommodation recess 22. The shaft 23 is sealed around the shaft 23 that performs rotational movement around the axis, reciprocating movement in the axial direction, and the like. The shaft 23 is inserted into the hole 22 a of the structure 21 through the sealing material housing recess 22. That is, the sealing material accommodating recess 22 communicates with the hole 22a and has an inner diameter larger than the diameter of the hole 22a.
The through hole 12 of the sealing material 10 has a shape and a size of the shaft 23 described later so that a gap is not generated between the inner peripheral surface of the through hole 12 and the outer peripheral surface of the shaft 23 when the shaft 23 is operated. It adjusts suitably according to the height.

  FIG. 3A is an exploded perspective view of the sealing material 10, the shaft 23, and the structure 21 in the sealing mechanism shown in FIG. FIG. 3B is a schematic front view for explaining the relationship between the sealing material 10 and the sealing material accommodation recess 22, where the sealing material 10 is indicated by a solid line and the sealing material accommodation recess 22 is indicated by a one-dot chain line. Yes.

As shown in FIG. 3A, for example, after inserting the shaft 23 into the through hole 12 of the sealing material 10, the shaft 23 is inserted into the hole 22 a of the structure 21, and the sealing material 10 is inserted into the sealing material 10. By press-fitting into the housing recess 22, the seal material 10 is interposed between the inner peripheral surface of the seal material housing recess 22 and the outer peripheral surface of the shaft 23 inserted through the seal material housing recess 22.
At this time, as shown in FIG. 3B, the maximum outer diameter R <b> 1 passing through the tip of the convex portion 15 is larger than the inner diameter R <b> 2 of the sealing material accommodating concave portion 22 in the cross section of the sealing material orthogonal to the axial direction of the shaft 23. is important. Thereby, when the sealing material 10 is press-fitted into the sealing material accommodation recess 22, the tip portion of the convex portion 15 comes into contact with the inner peripheral surface of the sealing material accommodation recess 22 and is compressed and deformed, and a part of it is A part of the outer peripheral surface of the elastic outer skin layer 31 is brought into close contact with the inner peripheral surface of the sealing material accommodation recess 22 and is moderately applied to the sliding layer 30. A pressing force can be applied. Thereby, the shaft periphery can be stably sealed for a long period of time with a pressing force in which sliding resistance and sealability are balanced.
In the present embodiment, the maximum outer diameter R1 passing through the distal end portion of the convex portion 15 is the length of a line segment connecting the distal ends of the convex portions 15 and 15 facing each other through the center point 25 of the sealing material 10. Say.

The pressing force applied to the sliding layer 30 can be adjusted by adjusting the maximum outer diameter R1 of the sealing material 10 with respect to the inner diameter R2 of the sealing material containing recess 22. If the pressing force on the sliding layer 30 due to the compression deformation of the elastic skin layer 31 is too strong, the sealing performance around the shaft 23 is improved, but the sliding resistance increases and the sliding portion wears out and becomes durable. Performance decreases. On the other hand, if the elastic skin layer 31 is not compressed and deformed and no pressing force is applied to the sliding layer 30, the sliding resistance is reduced, but the sealing performance is lowered.
The thickness of the sealing material 10 (the length in the axial direction of the shaft 23) is not particularly limited, and may be appropriately adjusted according to the use application of the sealing material 10 and is usually 0.5 to 20 mm.

  The size of the concave portion 14 is not particularly limited, but is preferably a size that is not completely filled with the convex portion 15 in which the gap portion 14 a is pushed when the sealing material 10 is press-fitted into the sealing material accommodation concave portion 22. As a result, it has both low sliding resistance and high sealing performance and excellent durability, even when the outer diameter accuracy is low, as compared with the case of producing a sealing material having no concave and convex portions on the outer peripheral surface. Since the sealing material can be manufactured, the productivity of the sealing material can be increased.

  The concave portions 14 and the convex portions 15 are preferably arranged alternately and regularly in the circumferential direction of the sealing material 10. As a result, when the sealing material 10 is press-fitted into the sealing material accommodating recess 22, it becomes easy to apply a uniform pressing force to the sliding layer 30 from all directions due to the compressive deformation of the elastic skin layer 31. Therefore, the sealing material 10 can be made higher in durability, lower in sliding resistance, and more excellent in durability.

(Sliding layer 30)
The sliding layer 30 constitutes the inner peripheral surface of the through-hole 12, and is an integrated fiber and elastomer. Thereby, the sliding resistance of the shaft 23 which contacts the through hole 12 can be reduced.

  The thickness of the sliding layer 30 is not particularly limited, and may be adjusted as appropriate according to the usage of the sealing material 10. The thickness of the sliding layer 30 refers to the thickness of the sealing material 10 in the radial direction.

  The elastomer constituting the sliding layer 30 mainly improves the durability of the fiber. Examples of the material of the elastomer constituting the sliding layer 30 include, for example, natural rubber, nitrile rubber, chloroprene rubber, hyperon, polybutadiene rubber, ethylene-propylene rubber (EPM), ethylene-propylene-diene terpolymer ( EPDM), hydrogenated acrylonitrile butadiene rubber (H-NBR), silicone rubber, fluorine rubber, acrylic rubber, styrene butadiene rubber, chlorinated polyethylene rubber, millable urethane, thermosetting polyurethane, thermoplastic polyurethane or thermoplastic polyester One or more of these are used. The elastomer constituting the sliding layer 30 may be blended with a vulcanizing agent, a vulcanization acceleration aid, and a reinforcing agent. Examples of the vulcanizing agent include organic peroxides such as dicumyl peroxide, organic sulfur compounds, and metal oxides. Examples of the vulcanization acceleration aid include fatty acids such as stearic acid, metal oxides, and the like. Examples of the reinforcing agent include carbon black and white carbon. Furthermore, for example, anti-aging agents, fillers, plasticizers, pressure-sensitive adhesives and the like can also be incorporated. In addition to these, in order to reduce sliding resistance, a solid lubricant such as graphite, silicon oil, fluorine powder, or molybdenum disulfide may be included in the elastomer.

The fibers constituting the sliding layer 30 mainly slide in contact with the outer peripheral surface of the shaft 23 and become a main factor for reducing the sliding resistance around the shaft 23.
Examples of the material of the fiber constituting the sliding layer 30 include nylon fiber, aramid fiber, polyester fiber, carbon fiber, Teflon (registered trademark) fiber, liquid crystal polymer fiber, glass fiber, and cotton yarn. The fibers constituting the sliding layer 30 may be in the form of a cloth material or may be mixed with the elastomer in the form of short fibers.
Examples of the cloth material include woven cloth, knitted cloth, and non-woven cloth. Although the fabric weight of a fabric material is 20-200 g / m < ² > normally, it is not specifically limited.

  When the form of the fiber is a cloth material, the cloth material and the elastomer are integrated so that the cloth material slides in contact with the outer peripheral surface of the shaft 23. On the other hand, when the form of the short fiber is used, the short material is short in the elastomer. The sliding layer 30 is obtained by mixing the fibers and integrally forming them.

(Elastic skin layer 31)
The elastic skin layer 31 stabilizes the shape of the sliding layer 30 and applies a pressing force to the sliding layer 30 when the sealing material 10 is press-fitted into the sealing material housing recess 22. Since the elastic skin layer 31 applies a pressing force to the shaft 23 for a long time to maintain the sealing performance, a configuration in which the elastic force of the foam or the like is easily changed is not suitable.

Examples of the elastomer constituting the elastic skin layer 31 include natural rubber, nitrile rubber, chloroprene rubber, hyperon, polybutadiene rubber, ethylene-propylene rubber (EPM), ethylene-propylene-diene terpolymer (EPDM), hydrogen. And elastomers such as additive acrylonitrile butadiene rubber (H-NBR), silicon rubber, fluorine rubber, acrylic rubber, styrene butadiene rubber, chlorinated polyethylene rubber, millable urethane, thermosetting polyurethane, thermoplastic polyurethane or thermoplastic polyester, One or more of these are used.
The elastomer constituting the elastic skin layer 31 may be blended with short fibers, a vulcanizing agent, a vulcanization acceleration aid, and a reinforcing agent. Examples of the short fibers include the same types of short fibers as the fibers constituting the sliding layer 30. Examples of the vulcanizing agent include organic peroxides such as dicumyl peroxide, organic sulfur compounds, and metal oxides. Examples of the vulcanization acceleration aid include fatty acids such as stearic acid, metal oxides, and the like. Examples of the reinforcing agent include carbon black and white carbon. Furthermore, for example, anti-aging agents, fillers, plasticizers, pressure-sensitive adhesives and the like can also be blended.

  The sealing material 10 of this embodiment is a laminated body of the sliding layer 30 and the elastic skin layer 31, but the sealing material of the present invention is not limited to this, and is obtained by integrally molding short fibers and an elastomer. It may be a single layer molded body. As the elastomer for integrally molding with the short fiber, the same elastomer as that constituting the elastic outer skin layer 31 can be used.

  The sealing material 10 includes, for example, vehicles such as automobiles, motorbikes, bicycles, amusement vehicles, motorboats, rail vehicles, ships, aircrafts, spacecrafts, various machines, machine tools, robots, production equipment that is not subject to vibration, It can be used as a sealing material applied as a shaft seal of a shaft such as a rotating shaft used in semiconductor machines, chip mounters and other industrial machines.

[Usage form]
The sealing material 10 is installed and used as follows, for example. First, as shown in FIG. 2, after inserting the shaft 23 into the through hole 12 of the sealing material 10, the shaft 23 is inserted into the hole 22 a of the structure 21, and the sealing material 10 is inserted into the sealing material housing recess 22. Press fit inside. Next, a lid 24 is attached to the structure 21, and the sealing material 10 is sealed in the sealing material accommodation recess 22.
Alternatively, after the sealing material 10 is press-fitted into the sealing material accommodation recess 22 in advance and the lid 24 is attached, the shaft 23 may be inserted into the hole 22 a of the structure 21 through the through hole 12 of the sealing material 10. .

  As the shape of the shaft 23, the cross section may be a substantially circle, a substantially square, a substantially polygonal shape, etc., and the outer peripheral surface thereof has a smooth surface, a surface on which a spiral protrusion or recess is formed, It may be an irregular surface.

〔Production method〕
The manufacturing method of the sealing material 10 is not particularly limited, and for example, a cloth material impregnated with an elastomer is wound around a rod-like material having the same shape as the outer peripheral surface of the shaft 23, and this is formed into a desired shape of the sealing material 10. The sealing material 10 can be obtained by wrapping an elastomer for forming an elastic skin layer between upper and lower molds that can be molded into a mold, heating under pressure, and then taking out from the mold and cutting it to the required thickness. Alternatively, a cloth material impregnated with an elastomer is wrapped around a rod-like material having the same shape as the outer peripheral surface of the shaft 23, and a fluid elastic outer layer forming elastomer is poured into a mold and cooled to room temperature or cured by heating. Then, a mold forming method for taking out from the mold can be used.

  For the impregnation treatment of the cloth material with the elastomer, a method of dipping the cloth material after dissolving the elastomer with a solvent or the like to form a liquid is preferably used. By impregnating the cloth material with the elastomer, the elastomer can enter between the fiber materials constituting the cloth material, and the fiber materials constituting the cloth material can be bonded together to reinforce the cloth material. In addition, by adopting a cloth material impregnated with elastomer as the sliding layer, not only is the wear due to rubbing between the fiber materials constituting the cloth material reduced, but also the wear resistance between the sliding layer and the shaft. Can be improved.

  As shown in FIG. 4, the ratio of the area A2 of the sealing material 10 to the corresponding area A1 of the circumscribed circle 10a of the sealing material 10 (A2 / A1, hereinafter referred to as area ratio) is 70 to 99%, preferably 80 to It is good that it is 98%, more preferably 85-98%. If the area ratio of the sealing material 10 is within the above range, the sealing material 10 has a gap portion 10b with respect to the outer circumference circle 10a. Therefore, when this gap portion 10b press-fits the sealing material 10 into the sealing material housing recess, The tip portion of the convex portion 15 comes into contact with the inner peripheral surface of the sealing material accommodating concave portion 22 to allow a part of the convex portion 15 that is compressed and deformed to escape. Here, the corresponding area A1 of the circumscribed circle 10a refers to an area obtained by subtracting the area of the through hole 12 formed in the central portion of the sealing material 10 from the area of the circumscribed circle of the sealing material 10.

[Other Embodiments]
The other form of the sealing material of this invention is shown to Fig.5 (a)-(e). In FIG. 5 (a), the outer periphery is a 24 square shape, and a plurality of convex portions 16a that are apex portions and concave portions 16b that are regions between adjacent apex portions are regularly and alternately formed in the outer peripheral direction. The sealing material 16 is shown. The number of convex portions is usually 7 or more and 48 or less in order to disperse the pressing force applied to the sliding layer by compressive deformation of the elastic outer skin layer when the sealing material is press-fitted into the sealing material accommodating concave portion 22. The number is preferably 12 or more and 48 or less, more preferably 16 or more and 48 or less.

FIG. 5B shows a crown-shaped shape having convex portions 17a whose outer periphery is a plurality of petal portions, and the convex portions 17a and the concave portions 17b between the adjacent convex portions 17a are alternately arranged in the outer peripheral direction. The sealing material 17 formed in FIG.
FIG. 5 (c) shows a star shape having convex portions 18a whose outer periphery is a plurality of corners, and a plurality of convex portions 18a and concave portions 18b between adjacent corners are alternately arranged in the outer peripheral direction. The sealing material 18 formed regularly is shown.
FIG.5 (d) is a gear-shaped shape which has the convex part 19a whose outer periphery is a several tooth part, and the several convex part 19a and the recessed part 19b between the adjacent convex parts 19a are alternated in the outer peripheral direction. The sealing material 19 formed regularly is shown.
FIG. 5 (e) shows an irregular shape having a plurality of protrusions 20a whose outer periphery is a plurality of protrusions, and a plurality of protrusions 20a and recesses 20b between adjacent protrusions 20a are formed irregularly. The sealing material 18 is shown.
The number of the convex portions 17a, 18a, 19a, and 20a shown in FIGS. 5B to 5E is 7 or more and 48 or less as in the case of the polygonal convex portion 16a in FIG. The number is preferably 12 or more and 48 or less, more preferably 16 or more and 48 or less.
In FIGS. 5A to 5E, reference numerals 16c, 17c, 18c, 19c, and 20c denote through holes, respectively. Others are the same as in the above-described embodiment, and thus detailed description thereof is omitted.

[Other seal mechanisms]
In the above embodiment, the case where the plurality of convex portions 15, 16 a, 17 a, 18 a, 19 a, and 20 a are provided on the elastic skin layer of the sealing material has been described, but other cases shown in FIGS. 6 (a) and (b) In the sealing mechanism, a convex portion is not provided on the outer periphery of the sealing material 26, and it is circular. That is, the sealing material 26 has a circular ring shape having the through hole 12 '. On the other hand, the inner periphery of the sealing material accommodation recess 27 formed in the shaft insertion port 51 for holding the sealing material 26 is a regular octagon. Hereinafter, each vertex of the regular octagon is referred to as a concave portion 28, and a side region connecting adjacent vertex portions is referred to as a convex portion 29. As shown in FIG. 6B, the diameter R4 of an inscribed circle (not shown) in contact with the convex portion 29 is formed smaller than the outer diameter R3 of the sealing material 26. As a result, a gap 28 a is formed between the sealing material 26 and the sealing material accommodation recess 27.
For this reason, when the sealing material 26 is press-fitted into the sealing material accommodation recess 27, the sealing material 26 comes into contact with the convex portion 29 on the inner peripheral surface of the sealing material accommodation recess 27 and is compressed and deformed, and a part thereof is the gap portion 28a. It can penetrate inside and secure high sealing performance. Others are the same as the above-mentioned embodiment.
In addition, although the inner periphery of the sealing material accommodation recessed part 27 is a regular octagon, this invention is not limited to this, As shown to Fig.5 (a)-(e), a polygon, a corolla type, a star shape , Gear type, irregular shape, etc.

  The number of the convex portions 29 is usually 7 or more and 48 or less in order to efficiently disperse the pressing force applied from the elastic outer skin layer to the sliding layer when the sealing material 26 is press-fitted into the sealing material accommodating concave portion 27. The number is preferably 12 or more and 48 or less, more preferably 16 or more and 48 or less.

Further, as shown in FIG. 7, the shaft from the area of the sealing material accommodation recess 27 to the area A3 obtained by subtracting the cross-sectional area perpendicular to the axial direction of the shaft 23 from the area of the circumscribed circle passing through the recess 28 of the sealing material accommodation recess 27. The area ratio (A4 / A3) of the area A4 minus the cross-sectional area perpendicular to the axial direction of 23 is 70 to 99%, preferably 80 to 98%, more preferably 85 to 98%. If the convex portion 29 becomes too large, the shape approaches a circular shape. Therefore, if the area ratio is within the above range, the design is optimal with both low sliding resistance and high sealing performance.
The recesses 28 and the protrusions 29 are preferably arranged alternately and regularly in the inner circumferential direction of the sealant-containing recess 27. Thereby, when the sealing material 26 is press-fitted into the sealing material accommodating recess 27, it is possible to apply an equal pressing force from all directions to the sliding layer from the elastic skin layer.

[Still other sealing mechanism]
FIG. 8 shows a sealing mechanism according to still another embodiment of the present invention. In this embodiment, the sealing material 10 shown in FIG. 1 is attached in a compressed deformation state in a sealing material accommodation recess 43 provided in a seal holding material 42 located outside the structure 21.

  That is, in this embodiment, as shown in FIG. 8, the seal holding member 42 is attached to the outside of the shaft insertion port 52 provided in the structure 21. The seal holding member 42 is formed with a seal material receiving recess 43 on the surface facing the shaft insertion port 52. The shaft insertion port 52 is sealed by interposing the sealing material 41 between the inner peripheral surface of the sealing material accommodating recess 43 and the outer peripheral surface of the shaft 23 inserted into the hole of the structure 21. That is, the seal holding member 42 is fixed to the outer wall surface of the structure 21 by screwing or the like after the sealing member 10 inserted on the shaft 23 is press-fitted into the sealing member receiving recess 43 to be compressed and deformed. The rest is the same as the embodiment shown in FIGS.

  In the embodiment shown in FIG. 8, the sealing material 10 provided with a plurality of convex portions 15 on the outer peripheral surface is used. However, as in the embodiment shown in FIG. 6, a circular seal that does not have convex portions on the outer peripheral surface. The material 26 is used, and a plurality of concave portions and convex portions are alternately arranged along the circumferential direction on the inner peripheral surface of the sealing material accommodating concave portion 43 provided in the seal holding material 42. It may be a sealing mechanism formed such that the diameter of the circle is smaller than the outer diameter of the sealing material.

  The sealing material and the sealing mechanism of the present invention can be suitably used for, for example, a driving device for handling powder or liquid.

10, 16, 17, 18, 19, 20, 41 Sealing material 14, 28 Concave portion 15, 29 Convex portion 22, 27, 43 Sealing material containing concavity 23 Shaft 30 Sliding layer 31 Elastic skin layer 42 Seal holding material 50, 51 , 52 Shaft insertion slot

Claims (9)

In order to seal between the hole portion and the shaft inserted into the hole portion, a ring-shaped sealing material that is press-fitted into a shaft insertion port or a sealing material housing recess formed outside thereof,
It is composed of an elastic material that has at least an inner peripheral surface side with a sliding layer in which fibers and elastomer are integrated, and a plurality of concave and convex portions are alternately arranged along the circumferential direction on the outer peripheral surface. ,
A sealing material characterized in that, in a cross section of the sealing material orthogonal to the axial direction of the shaft, a maximum outer diameter passing through a tip portion of the convex portion is larger than an inner diameter of the sealing material accommodation concave portion.   The sealing material according to claim 1, wherein the sealing material housing recess is formed in a shaft insertion port, communicates with the hole, and has an inner diameter larger than a diameter of the hole.   The sealing material according to claim 1, wherein the sealing material housing recess is formed on a surface facing the shaft insertion port in a sealing material holding member attached to the outside of the shaft insertion port.   The sealing material according to claim 1, wherein the plurality of concave portions and convex portions are regularly formed in a circumferential direction of the sealing material.   5. The seal according to claim 4, wherein, in a cross section orthogonal to the axial direction of the shaft, the shape of the outer periphery is a regular polygon in which each vertex portion is a convex portion and a side region connecting adjacent vertex portions is a concave portion. Wood.   The sealing material according to claim 1, wherein the elastic material includes a sliding layer in which fibers and an elastomer are integrated, and an elastic skin layer provided on an outer peripheral surface of the sliding layer. .   The sealing material according to claim 1, wherein the sliding layer is made of an elastomer in which short fibers are dispersed. A sealing mechanism that seals between a hole and a shaft inserted into the hole with a sealing material,
The sealing material is composed of an elastic material provided with a sliding layer in which fibers and an elastomer are integrated at least on the inner peripheral surface side, and a plurality of concave portions and convex portions are alternately arranged on the outer peripheral surface along the circumferential direction. In the cross-section of the sealing material that is arranged in parallel and orthogonal to the axial direction of the shaft, the maximum diameter that passes through the tip of the convex portion is formed to be larger than the inner diameter of the sealing material-containing concave portion,
A sealing material receiving recess is installed at the shaft insertion port of the hole or the front surface thereof, and the tip of the convex portion of the sealing material receiving recess is in a state where the sealing material is press-fitted into the sealing material receiving recess. A sealing mechanism that is compressed and deformed in contact with an inner peripheral surface. A sealing mechanism that seals between a hole and a shaft inserted into the hole with a sealing material,
The sealing material is composed of an elastic material provided with a sliding layer in which fibers and an elastomer are integrated at least on the inner peripheral surface side,
A plurality of concave portions and convex portions are alternately arranged along the circumferential direction on the inner peripheral surface of the sealing material containing concave portion, and the convex portion is formed in a cross section of the sealing material containing concave portion orthogonal to the axial direction of the shaft. The minimum diameter passing through the tip of the part is smaller than the outer diameter of the sealing material,
A sealing material accommodating recess is installed at the shaft insertion port of the hole or at the front surface thereof, and the outer peripheral surface of the sealing material is the sealing material accommodating recess when the sealing material is press-fitted into the sealing material accommodating recess. A seal mechanism, wherein the seal mechanism is compressed and deformed in contact with a tip portion of a convex portion.