[0001]The present invention relates to a sealing material and sealing mechanism for preventing the leakage and scattering of the powder such as toner.
Background technique
[0002]
　An image processing apparatus for handling a powder such as toner, for sealing the rotary shaft to prevent leakage of the powder, the patent document 1, the pile or fiber sheet into a cylindrical shape, a metal support member outer peripheral side thereof in restraining the cylindrical sealing member is disclosed. The cylindrical sealing member, the hold-down about the shaft at a moderate compressive force in the pile and fibers, are balanced in sliding resistance and sealing property.
[0003]
　However, the cylindrical sealing member, the durability of the pile and fibers is low, further the powder enters the sealing property is lowered between the piles and fibers. Further, deformation is likely to occur in the applied high pressure from the outer peripheral sealing material to enhance the sealing property. Therefore, in the apparatus be used for a long time under high load there is a problem that can not be used.
CITATION
Patent Literature
[0004]
Patent Document 1: JP 2008-26728 JP
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　An object of the present invention, as well as combines low sliding resistance and high sealing properties, it is to provide a sealing mechanism that can be alleviated highly durable sealant, and the external compressive forces.
Means for Solving the Problems
[0006]
　The present inventors have made intensive studies to solve the above problems, and have completed the present invention. That is, the sealing material of the present invention, and the hole of the structure, a sealing member for sealing between the shaft to be inserted into the hole portion, the inner peripheral surface during the relative movement of the shaft relative to the structure There has a ring-shaped or cylindrical form which slides said shaft, and a and sliding layer that is integral elastomeric fiber, laminated on the outer peripheral surface of the sliding layer has a porous structure and a laminate having an elastic outer skin layer.
Effect of the invention
[0007]
　Sealing material of the present invention, since the fibers and the elastomer is made of an elastic material provided in the inner peripheral surface of the sliding layer which is integrated, together with high sealability, excellent durability.
　The elastic outer skin layer disposed on the outer peripheral surface of the sliding layer because it has a porous structure, it is possible to relax the external compressive forces to the shaft, can be the appropriate sliding torque.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008]
FIG. 1 is a schematic sectional view showing a seal member and seal mechanism according to an embodiment of the present invention.
It is a schematic sectional view showing a seal mechanism according to another embodiment of the present invention; FIG.
3 is an explanatory view showing a sealing test method of sealing material.
FIG. 4 is an explanatory view illustrating a torque test method of the sealing material.
DESCRIPTION OF THE INVENTION
[0009]
　Figure 1 shows a sealing material 10 according to an embodiment of the present invention. The sealing member 10 is a ring-shaped, has a shaft insertion hole 3 in which the shaft 30 is inserted in the central portion, laminated in this order, toward the outer sliding layer 11 and the elastic outer skin layer 12 around the shaft 30 It is integrated.
[0010]
　Sealing material 10, as shown in FIG. 1, the inlet of the hole 21 of the structure 20, i.e. the inner circumferential surface of the sealing member housing recess 22 formed in the shaft insertion hole 51, the sealing member receiving recess 22 interposed between the outer peripheral surface of the insertion and shaft 30, is to seal the outer peripheral surface of the shaft 30 for rotational or axial reciprocating motion around the axis. Shaft 30 is inserted into the through sealing material accommodation recess 22 in the bore 21 of the structure 20. That is, the sealing member housing recess 22 communicates with the hole 21, and has an inner diameter larger than the diameter of the hole 21.
　Seal 10, as possible to prevent the gap is generated between the inner peripheral surface and outer peripheral surface of the shaft 30 of the shaft insertion hole 3 at the time of operation of the shaft 30, according to the shape and size of the shaft 30 to be described later It is appropriately adjusted Te.
[0011]
　Sliding layer 11 of the sealing member 10, as shown in FIG. 1, which seals the outer circumferential surface of the shaft 30, the fibers and the elastomer are integrated. Accordingly, the sliding resistance of the shaft 30 in contact is low, it may be a sealing material having excellent durability to sliding friction.
[0012]
　Elastomer forming the sliding layer 11 mainly is intended to improve the durability of the fibers, as the material thereof, for example, natural rubber, nitrile rubber, chloroprene rubber, Hypalon, polybutadiene rubber, ethylene - propylene rubber ( EPM), ethylene - propylene - diene terpolymers (EPDM), hydrogenated acrylonitrile-butadiene rubber (H-NBR), silicone rubber, fluorine rubber, acrylic rubber, styrene-butadiene rubber, chlorinated polyethylene rubber, millable urethane, heat curable polyurethane, include elastomers such as thermoplastic polyurethane or thermoplastic polyester, or more of these one or are used. The elastomer forming the sliding layer 11, vulcanizing aids and reinforcing agents may be blended. As the vulcanizing agent, for example, organic peroxides such as dicumyl peroxide, organic sulfur compounds, and metal oxides. As the vulcanization accelerator auxiliary agent, for example, fatty acids such as stearic acid, and metal oxides. As the reinforcing agent, for example, carbon black, white carbon. Furthermore, for example, anti-aging agents, fillers, plasticizers, may be incorporated such as adhesive. In addition to these, in order to reduce the sliding resistance, graphite, silicone oil, fluorine powder, or a solid lubricant such as molybdenum disulfide is included in the elastomer.
[0013]
　Fibers constituting the sliding layer 11 mainly is intended to sliding contact with the outer peripheral surface of the shaft 30, a main factor for reducing the sliding resistance around the shaft 30.
　As the material of the fibers constituting the sliding layer 11, for example, nylon fibers, aramid fibers, polyester fibers, carbon fibers, Teflon fibers, liquid crystal polymer fibers, glass fibers, etc. cotton and the like. Fibers constituting the slide layer 11 may be in the form of a cloth material may be mixed into the elastomer in the form of short fibers. As the fabric material, woven fabric, and a knitted fabric or a nonwoven fabric. Basis weight of the fabric material is generally 20 ~ 200 g / m 2 but is not particularly limited.
[0014]
　If the form of fibers are cloth material, fabric material to integrate the fabric material and the elastomer in contact sliding with the outer circumferential surface of the shaft 30. On the other hand, if in the form of short fibers, by integrally molded crowded mixing short fibers in the elastomer, the sliding layer 11 is obtained.
[0015]
　Elastic outer skin layer 12 has a porous structure. Such elastic outer skin layer 12, the elastomeric material is containing a blowing agent, etc., at the same time is foamed vulcanized by heat and pressure, obtained by so-called foam-crosslinking. The elastomeric material used, may be used similar to the elastomeric material and the slide layer 11, to use the same elastomeric material as the sliding layer 11 is particularly preferable in order to integrate the slide layer 11.
[0016]
　The foaming agent used for the elastic outer skin layer 12, both those which are conventionally used in the foaming of the elastomer may be used, such as sodium hydrogen carbonate, ammonium carbonate, diazoaminobenzene, N, N'-dinitroso tetramine, and azodicarbonamide and the like. Other additives such as vulcanizing agent is can be used a material similar to that of the slide layer 11.
[0017]
　The addition amount of the foaming agent, the elastic outer skin layer 12 to be obtained, to relieve pressure on the sealing material may be adjusted so as to have a sufficient hardness and density to reduce the sliding torque. Specifically, the hardness of the elastic outer skin layer 12 (rubber hardness) of JIS K6253 type A durometer according to the measurement at 50 ~ 90Hs, it's better and preferably about 60 ~ 70Hs. Elastic density of the outer skin layer 12 is ~ 1.4 kg 1.0 / m 3 , preferably 1.1 ~ 1.2 kg / m 3 may be between about.
　The addition amount of the foaming agent is usually the elastomer amount from 0.1 to 10 mass%, and it is preferably 0.3 to 3.0 mass%.
[0018]
　Radial thickness of the sliding layer 11 and the elastic outer skin layer 12 is not particularly limited, it may be appropriately adjusted depending on the intended use of the sealing member 10, but external compressive force applied from the sealing material 10 of the outer shaft 30 the in mitigating, the ratio of the thickness of the radial direction of the elastic outer skin layer 12 having a slide layer 11 and the porous structure, 1: good is 10-30.
　Seal 10 is a ring-shaped or cylindrical. The length along the axial direction of the shaft 30 of the sealing member 10 is not particularly limited, it is preferable is usually about 0.5 ~ 10 mm.
[0019]
　Shaft insertion hole 3 of the sealing member 10, the shape is determined based on the shape of the shaft 30. Cross-sectional shape of the shaft 30, for example, circular, square, or the like may be used polygonal. Shaft 30 may be of the screw groove on the outer surface (not shown) is formed. In this case, the inner peripheral surface of the shaft insertion hole 3 of the sliding layer 11, the screw groove can screwed with the screw groove of the shaft 30 is formed, preferably in order to ensure the sealing property.
[0020]
　The production method of the sealing member 10 according to the present invention is not particularly limited. For example, the stick-shaped material having the same shape as the outer peripheral surface of the shaft 30, winding a fiber impregnated with elastomer sliding layer formed (fabric material), further the elastic outer skin layer formed containing a foaming agent on its outer surface wind the elastomer. This was housed between the moldable upper and lower molds to the shape of the desired sealing member 10, and heated under pressure to adhere, foaming the elastic outer skin layer forming elastomer simultaneously. Then, it is possible to obtain the sealing material 10 by cutting the required thickness removed molded product from the mold.
　Further, the stick-shaped material having the same shape as the outer peripheral surface of the shaft 30, is wound a cloth material impregnated with elastomer sliding layer formed is housed between the mold, then flowability containing a blowing agent elastic outer skin layer forming elastomer with a cast in the mold, even in die molding method or the like is taken out from the heating under pressure in the mold, it is possible to manufacture the sealing member 10.
[0021]
　Impregnation of the fabric material by elastomer after the elastomer has a liquid dissolved in a solvent or the like, a method of impregnating the cloth material is preferably used. By impregnating the cloth material by the elastomer, elastomer enters between the fibrous material constituting the cloth material, put together and to adhere the fibrous material that constitute the fabric material, it is possible to reinforce the fabric material. By employing an elastomeric fabric material impregnated with a sliding layer, not only the abrasion due to rubbing of the fiber material that constitute the fabric material is reduced, improving the wear resistance between the sliding layer and the shaft it is possible to.
　Without integrally molded as described above, or may be adhered with an adhesive and an elastic outer skin layer 12 having a slide layer 11 and porous structure.
[0022]
[Seal Mechanism
　sealing material 10, for example, is installed as shown in FIG. 1, it is used. That is, after inserting the shaft 30 into the sealing member 10 the central portion of the shaft insertion hole 3, is inserted the shaft 30 in the hole portion 21 of the structure 20, sealing a seal member 10 bore 21 forward of the material accommodating recess It is press-fitted into the 22. Then, attach the seal holding member 24 on the outer surface of the structure 20, to seal the sealing member 10 in the sealant receiving recess 22.
　Advance a sealing member 10 is pressed into the sealing member receiving recess 22, after attaching the seal retaining member 24, inserting the shaft 30 through the shaft insertion hole 3 of the seal member 10 into the hole portion 21 of the structure 20 good.
[0023]
　Sealing the holding member 24, as shown in FIG. 1, after attaching a compressed state by press-fitting the sealing member 10 extrapolated to the shaft 30 in the sealing member receiving recess 22, screwed to the outer wall surface of the structure 20 ( not shown) it is intended to fix the like. The seal holding member 24 confines the sealant 10 in the sealant receiving recess 22 is not particularly limited as long as it can be secured to the structure 20. The seal holding member 24, the sealing member 10 is fixed to the sealing member receiving recess 22, the shaft 30 does not deviate from the structure 20 also move.
[0024]
　If the elastic outer skin layer 12 is a non-foam having no porous structure, the pressing force from the seal retaining member 24 is diffused in many directions with the elastic outer skin layer 12, it tends to occur deformation of the appearance of the elastic outer skin layer 12 Become. In contrast, as in this embodiment, when the elastic outer skin layer 12 has a porous structure, the seal holding member 24, when compressing an elastic outer skin layer 12 at the time of mounting, the elastic outer skin layer 12 can void portion in the porous structure contained (not shown) is deformed under pressure from the seal retaining member 24, to relax the external compressive forces. Therefore, deformation of the appearance of the elastic outer skin layer 12 is suppressed.
[0025]
　In the elastic outer skin layer 12 can be expected spring effect resilient raised by the porous structure. This spring effect, certain more external pressure the sliding layer 11 when applied to the elastic outer skin layer 12 can be pressed against the shaft 30, thereby improving the sealing property.
[0026]
　When the shaft 30 penetrating the sealing member 10 is operated to rotate or axially, as shown in FIG. 1, there is a case where foreign matter 4, such as dust or dirt adheres to the surface of the shaft 30. In this case, foreign matter 4 is blocked by a sealing material 10 so as not enter into the hole 21 of the structure 20. Therefore, the foreign matter 4 is collected in the sealant 10 side, since it is removed from the shaft 30, it can be prevented from entering the structure 20 of the foreign body 4.
[0027]
　In the above embodiment, as shown in FIG. 1, the sealing member 10 is the front of the foreign matter 4 enters is formed perpendicular to the shaft 30, for example, the inner peripheral surface side outer peripheral surface of the sealing member 10 front may be constituted by inclined bevelled so as to be positioned outside of the structure 20 than. Thus, it is possible to effectively eliminate the foreign matter 4.
[0028]
[Other sealing mechanisms]
　Figure 2 shows a seal mechanism according to still another embodiment of the present invention. In this embodiment, the sealing member receiving recess 43 provided in the seal retaining member 42 located on the outside of the structure 20, the sealing member 10 is attached in a compressed state.
[0029]
　In this embodiment, as shown in FIG. 2, the seal holding member 42 is attached to the outside of the shaft insertion hole 52 provided in the structure 20. Sealing the holding member 42, the sealing member accommodation recess 43 is formed on the surface facing the shaft insertion opening 52. And the inner peripheral surface of the sealing member accommodation recess 43, a sealing member 10 is interposed between the outer circumferential surface of the shaft 30 which is inserted into the hole portion 21 of the structure 20, sealing the shaft insertion opening 52. That is, the seal holding member 42 after press-fitting to be compressed and deformed in the sealing material accommodation recess 43 a sealing material 10 extrapolated to the shaft 30, is fixed by screwing on the outer wall surface of the structure 20. The rest is the same as the embodiment shown in FIG.
[0030]
　Sealing materials and sealing mechanism of the present invention, for example, automobiles, motorbikes, bicycles, vehicle amusement, and motor boats, railway vehicles, ships, aircraft, such as spacecraft vehicles, various machinery, machine tools, robots, vibration production equipment dislike, image processing apparatus, a semiconductor manufacturing apparatus, industrial machinery such as a chip mounter, can be suitably used as a sealing material to be applied as a shaft sealing of a shaft, such as a rotary shaft for use in other.
Example
[0031]
　The present invention will hereinafter be described by examples in more detail, the present invention is not limited only to the following examples.
(Example)
　First, a base rubber (NBR rubber) primary kneading and (mastication), this to those DPT as the blowing agent (dinitrosopentamethylenetetramine) was added 0.55% by weight relative to the base rubber total prepared, to obtain a raw material rubber of the sealing member and the secondary kneading (kneading).
　Then, the same rod-like product shapes and the outer peripheral surface of the shaft 30, winding the elastomer and the impregnated fabric and then wound on the starting rubber with the addition of blowing agent, it is heated under pressure canvas and fused to obtain a cylindrical sealing member by. Thereafter, it was removed from the mold and cut into a predetermined thickness to obtain a sealing material. It shows the hardness and density of the sealing material in Table 1. Hardness, the outer peripheral surface of the seal member 10 is measured by a rubber hardness meter.
[0032]
(Comparative Example)
　except that no addition of foaming agent to the raw material rubber, to obtain a sealing material in the same manner as in Example. It shows the hardness and density of the sealing material in Table 1.
[0033]
(Seal Test)
　As shown in FIG. 3, the sealing member 10, is inserted a screw shaft 31 of the ball screw as a shaft, which is formed in a disk-like structure 20 '(corresponding to the nut of the ball screw) seal after accommodated in the timber accommodating recess 22, the seal holding member 24 is attached to the sealing member 10 is fixed by tightening the screws 26. At this time, the outer peripheral side of the sealing member receiving recess 22 is disposed a spacer 25 was adjusted so that the compression of the sealing member 10 is 2%. To form a clearance T is between the sealing member 10 and the spacer 25, the outer peripheral direction so as not compressed.
　Next, apply grease 27 mixed with red ink to the surface of the screw shaft 31 to rotate the screw shaft 31 was allowed to proceed for structure 20 'in the direction of the arrow shown in FIG. The removal rate from the shaft 30 of the grease 27 when the structure 20 'has passed once coated portion of the grease 27 captured by image analysis cameras, to measure the sealability of the sealing material 10.
　Sealing property, the image analysis camera images and analyzes whether you are how much remains in the grease 27 screw shaft 31 was evaluated when not remain at all as sealability 100%. The results are shown in Table 1.
[0034]
(Torque Test)
　As shown in FIG. 4, the sealing member 10, are inserted into the screw shaft 31 'of the ball screw, is brought into contact with both sides of the structural member 50 (corresponding to the nut), the seal holding the outer surface of the sealing member 10 the timber 42, 42 'is attached, and the seal holding member 42 a seal material 10 is fixed by tightening a screw 26 or the like. At this time, the sealing member 10 is not compressed in the outer diameter direction was compressed state 2% in the thickness direction.
　Next, the screw shaft 31 is rotated at 100 times / min, the generated load detected by the load cell attached to the screw shaft 31 (not shown). The results are shown in Table 1.
[0035]
[Table 1]

　change ratio was determined (Example / Comparative Example) × 100.
[0036]
　As shown in Table 1, the sealing material of the embodiment, the elastic outer skin layer is made of a foamed elastic body of porous structures, each approximately 5% lower than the normal elastic material hardness and density Comparative Example, the shaft torque applied to has also been reduced by about 17%. The sealing property, no significant difference between the example and the comparative example, the torque while maintaining the sealing performance it can be seen that be reduced.
DESCRIPTION OF SYMBOLS
[0037]
3 shaft insertion hole
4 foreign material
10 sealing member
11 sliding layer
12 the elastic outer skin layer
20, 20 'structure
21 hole
22 sealing material accommodation recess
24 seal holding member
25 spacer
26 screws
27 Grease
30 shaft
31 screw shaft
(shaft) 42 , 42 'seal holding member
43 sealing material accommodation recess
50 structural member
51 shaft insertion opening
52 shaft insertion opening

claims

[Claim 1]And the hole of the structure, a sealing member for sealing between the shaft to be inserted into the hole portion,
　a ring-shaped inner peripheral surface during the relative movement of the shaft relative to the structure to slide with said shaft or has a cylindrical form, fibers and a sliding layer and are integrated elastomer
　laminated on the outer peripheral surface of the sliding layer, an elastic outer skin layer having a porous structure
characterized in that it comprises sealing material to be.
[Claim 2]
　The elastic outer skin layer, the sealing material according to claim 1 is obtained the same elastomeric material as the elastomeric foamed in the sliding layer.
[Claim 3]
　The elastic outer skin layer, the sealing material according to claim 1 or 2 in which is integrally molded with the sliding layer.
[Claim 4]
Fibers in the sliding layer, the sealing material according to any one of claims 1 to 3 used in the form of a cloth material.
[Claim 5]
　Sealing material according to claim 4, wherein the sliding layer is formed by impregnating the elastomer to the fabric material.
[Claim 6]
　Sealing material according to any one of claims 1 to 3, the fibers in the sliding layer is a short fiber formulated in the elastomer.
[Claim 7]
　Sealing mechanism sealing material according to any one of claims 1 to 6, characterized in that mounted in close contact with the outer periphery of the shaft insertion mouth or the shaft insertion opening at the hole of the structure.
[8.]
　The sealing material, sealing mechanism according to claim 7 which is fixed by being pressed into the hole side by a seal holding member which is attached to the outside of the structure.