JP6045952B2 - Ball screw, seal material, and seal structure - Google Patents

Description

  The present invention relates to a ball screw used in various industrial machines, a seal material applicable to the ball screw, and a seal structure.

  Conventionally, in a ball screw device in which a ball nut is fitted to the outer periphery of a ball screw shaft, a lip seal member having a lip portion that elastically contacts the peripheral surface of the ball screw shaft is provided at the end of the ball nut. A wiper-type seal member having a cylindrical shape that fits on the outer periphery of the ball screw shaft on the outer side in the axial direction of the lip seal member, and a protrusion that fits in the thread groove of the ball screw shaft on the inner peripheral surface Is known (see Patent Document 1). In this ball screw device, the combination of the lip seal member and the wiper seal member prevents fine foreign matter from entering between the ball screw shaft and the ball nut.

  On the other hand, a sealing material formed in the same shape as the outer peripheral surface of the ball screw shaft is known (see Patent Document 2). This sealing material is provided with a thin sliding ring formed of synthetic resin on the outer peripheral surface of the ball screw shaft for the purpose of reducing sliding resistance when the ball screw shaft is fitted. It is configured by tightening the outer peripheral surface with a backup ring formed of synthetic rubber.

JP 2001-304372 A JP-A-1-275953

  However, in the ball screw device disclosed in Patent Document 1 described above, even if the intrusion of foreign matter between the ball screw shaft and the ball nut can be suppressed by the combined use of the lip type seal member and the wiper type seal member, There is a problem in that sliding resistance increases when the screw shaft is fitted to the seal member, and sliding performance is deteriorated.

  In the sealing material disclosed in Patent Document 2, since the synthetic resin is not shrinkable, it is difficult to make the sliding ring uniformly follow the outer peripheral surface of the ball screw shaft. Since the back-up ring is used for large tightening, even if synthetic resin with good slidability is used, the sliding resistance when fitting the ball screw shaft to the sealing material increases, and the slidability is reduced. There was a problem of getting worse.

  Therefore, the present invention can reduce sliding resistance when fitting the male member to the sealing material while effectively suppressing the entry of minute foreign matter between the male member and the female member. An object is to provide a ball screw, a sealing material, and a sealing structure.

(1) In the ball screw of the present invention, the male member having a plurality of male grooves capable of rolling the ball on the outer peripheral surface, and the plurality of female grooves capable of rolling the ball are opposed to the male groove. A female member having an inner peripheral surface formed and a circulation path capable of circulating the ball, and a seal member provided at one end portion and / or the other end portion in the axial direction of the female member A ball screw in which the male member and the female member are fitted in the axial direction, and the sealing material is a hole that can communicate with the inner peripheral surface of the female member; A fiber that is configured to be able to fit into the male groove of the male member when the male member is inserted into the hole, and whose surface is at least one surface impregnated with rubber or resin. And a first rubber layer or resin laminated on a surface opposite to the one surface in the fiber layer And a second rubber layer or a resin layer that has water repellency or / and oil repellency and is laminated with a predetermined thickness on the surface of the one surface of the fiber layer. .

  According to the configuration of (1) above, the surface of one surface of the fiber layer configured to be fitted with the male groove of the male member when the male member is inserted into the hole is made of rubber or resin. By using impregnated fibers, the fibers can be firmly bonded together by rubber or resin, and as a result, the shape of one side of the fiber layer can be maintained, and the fiber male mold There are trade-offs between each other, such as suppressing the entry of fine foreign matter between the member and the female member, and reducing the sliding resistance when the male member and the female member move relatively in the axial direction. Both related issues can be solved simultaneously. Further, by laminating a reinforcing rubber layer or resin layer on the surface of the fiber layer opposite to the side where the holes are formed, the shape of the convex portion of the fiber layer is further stabilized, and the ball Deformation of the entire fiber layer during screw driving can be suppressed. Further, since the rubber layer or the resin layer is laminated, the fiber layer and the rubber layer or the resin layer can be stably fixed to one end or the other end of the female member. In addition, since the second rubber layer or resin layer having water repellency or / and oil repellency is formed on the surface of one surface of the fiber layer, dust, grease, oil, etc. enter the fiber layer. Can be prevented, and deterioration of the fiber layer can be suppressed. In addition, since the surface friction coefficient of the second rubber layer or the resin layer is lower than that of the conventional one, sliding wear between the male mold member and the sealing material is less likely to occur, so that the durability of the sealing material is further improved. Can be improved. That is, it is possible to improve the durability life of the sealing material, and thus the life of the present ball screw, as compared with the prior art.

(2) In the sealing material of the present invention, the male member having a plurality of male grooves capable of rolling the ball on the outer peripheral surface, and the plurality of female grooves capable of rolling the ball are opposed to the male groove. A female member having an inner peripheral surface formed and having a circulation path through which the ball can be circulated, and a sealing material used for a ball screw fitted in an axial direction. A hole communicable with the inner peripheral surface of the mold member, and is configured to be able to fit into the male groove of the male member when the male member is inserted into the hole. A fiber layer made of fibers impregnated with rubber or resin, a first rubber layer or resin layer laminated on a surface of the fiber layer opposite to the one surface, and water repellency or / and water repellency. A second layer that is oily and is laminated with a predetermined thickness on the surface of the one surface of the fiber layer. And having a rubber layer or resin layer.

  According to the configuration of the above (2), the sealing material of the present invention includes a male member in which a plurality of male grooves capable of rolling a ball is formed on the outer peripheral surface, and a plurality of female grooves capable of rolling the ball. When the male member is inserted into the hole when it is applied to a female member having an inner peripheral surface formed facing the male groove and having a circulation path through which the ball can circulate. By forming the surface of one surface of the fiber layer configured to be matable with the male groove of the male member using a fiber impregnated with rubber or resin, the fibers are bonded with rubber or resin. It can be firmly assembled, and thus the shape of one surface of the fiber layer can be maintained, the entry of fine foreign matter between the male member and the female member, and the male member Reducing sliding resistance when the female member moves relatively in the axial direction. Both problems are in a relationship of trade-off can be solved simultaneously. Further, by laminating a reinforcing rubber layer or resin layer for the fiber layer on the surface opposite to the side where the holes are formed in the fiber layer, the shape of the convex portion of the fiber layer is further stabilized, and the ball Deformation of the entire fiber layer during screw driving can be suppressed. Further, since the rubber layer or the resin layer is laminated, the fiber layer and the rubber layer or the resin layer can be stably fixed to one end or the other end of the female member. In addition, since the second rubber layer or resin layer having water repellency or / and oil repellency is formed on the surface of one surface of the fiber layer, dust, grease, oil, etc. enter the fiber layer. Therefore, the deterioration of the fiber layer can be suppressed. In addition, since the surface friction coefficient of the second rubber layer or the resin layer is lower than that of the conventional one, sliding wear between the male mold member and the sealing material is less likely to occur, so that the durability of the sealing material is further improved. Can be improved. That is, the durability life of the sealing material can be improved as compared with the conventional case.

(3) In the seal structure of the present invention, the male member having a plurality of male grooves capable of rolling the ball on the outer peripheral surface, and the plurality of female grooves capable of rolling the ball are opposed to the male groove. A female member having an inner peripheral surface formed and having a circulation path through which the ball can be circulated, and a seal structure applied to a ball screw fitted in an axial direction. A hole communicable with the inner peripheral surface of the mold member, and is configured to be able to fit into the male groove of the male member when the male member is inserted into the hole. A fiber layer made of fibers impregnated with rubber or resin, and a rubber layer having water repellency or / and oil repellency and laminated on the surface of the one surface of the fiber layer with a predetermined thickness Or a resin layer.

  According to the configuration of (3) above, the surface of one surface of the fiber layer configured to be fitted with the male groove of the male member when the male member is inserted into the hole is made of rubber or resin. By using impregnated fibers, the fibers can be bonded together by rubber or resin and firmly gathered together, and as a result, the shape of one surface of the fiber layer can be maintained. In addition, the suppression of the entry of fine foreign matter between the male member and the female member, and the reduction of sliding resistance when the male member and the female member relatively move in the axial direction, Both issues that are in a trade-off relationship with each other can be solved simultaneously. In addition, since a rubber layer or a resin layer having water repellency or / and oil repellency is formed on the surface of one surface of the fiber layer, dust, grease, oil, and the like enter the fiber layer. Since it can prevent, deterioration of a fiber layer can be suppressed. In addition, since the surface friction coefficient of the rubber layer or resin layer is lower than before, sliding wear between the male member and the seal structure is less likely to occur, so the durability of the seal structure is further improved. can do. That is, the durability life of the seal structure can be improved as compared with the conventional case.

(A) It is an example of the perspective view which shows schematic structure of the ball screw which concerns on one Embodiment of this invention. (B) It is an example of explanatory drawing which shows the internal structure of the female type | mold member which concerns on this embodiment, and a sealing material. It is an example of the disassembled perspective view of the principal part of the ball screw which concerns on this embodiment.

  Hereinafter, a ball screw according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1 (b), the sealing material 4 that is configured as a pair and does not need to be specifically distinguished and described is one sealing material 4 (the sealing material on the left side of the drawing) in order to simplify the drawing. For each of the seal materials 4 (the seal material on the right side of the paper), the symbols for the respective portions may be omitted as appropriate.

  As shown in FIGS. 1A and 1B, the ball screw 1 includes a male member 2, a female member 3, and a pair of sealing materials 4.

  The male member 2 is made of metal and has a rod-like main body 5 and a plurality of spiral male grooves 7 formed on the outer peripheral surface 6 of the main body 5 as shown in FIG. doing.

  The female member 3 is made of metal, and includes a cylindrical tubular portion 8 and a plate-like plate-like portion 9 formed at one end of the tubular portion 8 as shown in FIG. Have. Here, the cylindrical part 8 and the plate-like part 9 are integrally formed. As shown in FIG. 1B, a plurality of female grooves 12 are formed on the inner peripheral surfaces 10 and 11 of the cylindrical portion 8 and the plate-like portion 9. Each female groove 12 is formed in a spiral shape like the male groove 7 and is formed at a position facing the male groove 7 of the male member 2 as shown in FIG. Further, as shown in FIG. 1B, a circulation path 13 through which a plurality of balls B can circulate is formed inside the cylindrical portion 8. As shown in FIG. 1B, a track P that can communicate with the circulation path 13 is formed between the male groove 7 and the female groove 12. A plurality of balls B are filled in the track P.

  In the ball screw 1 of this embodiment, when the male member 2 and the female member 3 rotate relative to each other, the ball B advances while rolling on the track P, and returns to the original position via the circulation path 13. An infinite circulation path of returning is configured, and the circulation of the ball B is repeated. By such circulation of the balls B, the male member 2 and the female member 3 are relatively moved in the axial direction and can be fitted to each other. The male groove 7 of the present embodiment has a so-called four-thread structure in which the number of threads is four, and four circulation paths 13 are formed according to the number of threads.

  As shown in FIG. 1B, the sealing material 4 includes a fiber layer 14, a rubber layer or resin layer (first rubber layer or resin layer) 15, a cover member 16, a rubber layer or resin layer (first layer). 2 rubber layers or resin layers) 17. In the following description, the first rubber layer or resin layer 15 is simply referred to as the resin layer 15, and the second rubber layer or resin layer 17 is simply referred to as the resin layer 17.

  The fiber layer 14 can be formed of aramid fiber, nylon, urethane, cotton, silk, hemp, acetate, rayon, fiber containing fluorine, polyester, and the like, and is impregnated with rubber or resin. The fiber shape may be, for example, a short fiber shape or a long fiber shape.

  By impregnating the fibers with rubber or resin, the rubber material or resin material enters between the fibers, and the fibers are bonded together to function as the fiber layer 14. Further, when the fibers are impregnated with rubber or the like, wear due to rubbing between the fibers is reduced, and further, the wear resistance of the surface of the fiber layer 14 generated between the fiber layer 14 and the male member 2 is increased. Can be achieved.

  In addition, the rubber | gum should just be what can impregnate a fiber. Examples of the rubber include urethane rubber, nitrile rubber, silicon rubber, fluorine rubber, acrylic rubber, ethylene-propylene rubber, butyl rubber, isoprene rubber, chlorinated polyethylene rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, chloroprene rubber, Polybutadiene rubber, styrene butadiene rubber, natural rubber, or the like can be used alone, or those obtained by variously modifying these rubbers. These rubbers can be used alone or in a blend of a plurality of types of rubbers. In addition to vulcanizing agents, rubbers that have been conventionally used as rubber compounding agents, such as vulcanization accelerators, anti-aging agents, softeners, plasticizers, fillers, and coloring agents, are used in appropriate amounts. Can be blended. In addition to these, in order to improve the lubricity of the fiber layer 14, a solid lubricant such as graphite, silicon oil, fluorine powder, or molybdenum disulfide may be included in the rubber. Furthermore, instead of or together with the rubber, acrylic resin, polyester resin, urethane resin, vinyl chloride resin, polypropylene, polycarbonate, PET resin, fluororesin, polyethylene, AS resin, ABS resin, polystyrene resin, polyvinyl chloride Also, thermoplastic resins such as polyvinylidene chloride, polyvinyl acetate, nylon, alkyd resin, phenol resin, epoxy resin, polyphenylene sulfide resin, or thermosetting resin can be used.

  For the above-mentioned impregnation treatment of the fiber with rubber or resin, a method of dipping a predetermined fiber (short fiber, long fiber or cloth) after dissolving the rubber or resin with a solvent or the like to form a liquid is preferably used. . As a precursor of the fiber layer 14, a cloth in which fibers are formed in a sheet shape can be used. The method of impregnating the cloth with rubber or resin is also performed in the same manner as described above.

  Examples of what constitutes the fabric include a nonwoven fabric in which fibers are entangled irregularly, a regularly woven fabric, a knitted fabric (knit), and the like. Since these cloths are in the form of a sheet as compared with those composed only of fibers (short fibers and long fibers), they can be easily impregnated with rubber or the like (easy to handle), and further on the surface of the cover member 16. Also has the feature of being easy to adhere. For the weaving method, plain weave, satin weave, twill weave, or the like is used.

  In addition, the cloth preferably has a certain degree of elasticity. When the cloth is molded into a shape that conforms to the shape of the male groove 7, the cloth surface is easily stretchable so that the surface of the cloth follows the shape of the male groove 7, and the surface of the finished fiber layer 14 is wrinkled. There is an advantage that the surface does not easily occur and the surface is finished uniformly. As a result, the male member 2 and the sealing material 4 can be smoothly fitted. Furthermore, the sliding resistance generated between the male member 2 and the sealing material 4 can be reduced. In particular, by producing the fiber layer 14 so that the direction of the stretchability of the cloth coincides with at least the height direction of the cylindrical fiber layer 14 (the axial direction of the ball screw), the generation of wrinkles and the like described above can be achieved. This can be further suppressed.

  As shown in FIG. 1B, the fiber layer 14 has an inner circumferential surface (a surface on the inner side of the fiber layer 14) 14 b, and the male groove 7 of the male member 2 is formed on the inner circumferential surface 14 b. Convex part 14c along the shape is formed. A resin layer 17 (having a thickness of 50 μm or more) formed by a process described later is laminated on the surface of the convex portion 14c. Here, the resin layer 17 is hardened but has flexibility. The coating here refers to applying a resin or the like to a material surface in a relatively high viscosity state (for example, a viscosity of 1000 cps or more). Further, as shown in FIG. 1B, the fiber layer 14 includes an inner peripheral surface 14b provided at a position surrounding the resin layer 17, and a convex portion 14c formed on the inner peripheral surface 14b. Yes. The convex portion 14 c is a portion that can be fitted into the male groove 7 of the male member 2 through the resin layer 17 when the male member is inserted into the inner peripheral surface 14 b.

  The resin layer 17 is provided with water repellency or oil repellency, and in order to develop a function of water repellency or / and oil repellency, the resin layer 17 includes at least silicon resin, PTFE, urethane resin, acrylic silicone resin, and fine particles thereof. It may be formed of rubber or resin including one, or may be formed of silicon resin, PTFE, urethane resin, or acrylic silicone resin itself. As a rubber or resin containing at least one of silicon resin, PTFE, urethane resin, acrylic silicone resin and fine particles thereof, for example, nitrile butadiene rubber can be considered. In order to develop water repellency or / and oil repellency, the ratio of the resin added to the rubber or resin is, for example, 5 wt% or more and less than 50 wt%, preferably 10 wt% or more and 30 wt% with respect to the rubber or resin 100. When there are few components that develop water repellency and oil repellency, the effect of water repellency and oil repellency is small, and conversely, when there are many components that express water repellency and oil repellency, adhesion to the fiber layer 14 becomes poor, and the resin is in use. There is a possibility that the layer 17 may be peeled off from the fiber layer 14. The resin layer 17 is laminated with a predetermined thickness (50 μm or more) on the surface of the inner peripheral surface 14b following the shape of the inner peripheral surface 14b of the fiber layer 14. Further, as shown in FIG. 2C, the resin layer 17 is a cylindrical thin layer having a hole 17a. And this hole 17a is connected with each inner peripheral surface 10 and 11 of the female-type member 3, as shown in FIG.1 (b). Further, as shown in FIG. 1B, the resin layer 17 is formed on an inner peripheral surface (an inner surface of the resin layer 17) 17b provided at a position surrounding the hole 17a and the inner peripheral surface 17b. And a convex portion 17c. The convex portion 17c is a portion that can be fitted into the male groove 7 of the male member 2 when the male member is inserted into the hole 17a.

  The resin layer 15 is, for example, urethane rubber, nitrile rubber, silicon rubber, fluorine rubber, acrylic rubber, ethylene-propylene rubber, butyl rubber, isoprene rubber, chlorinated polyethylene rubber, epichlorohydrin rubber, hydrogenated nitrile rubber, chloroprene rubber, Polybutadiene rubber, styrene butadiene rubber, natural rubber, etc. alone or those modified in various ways, acrylic resin, polyester resin, urethane resin, vinyl chloride resin, polypropylene, polycarbonate, PET resin, fluorine resin, etc. Can be used.

  The resin layer 15 is a cylindrical layer having a hole into which the outer peripheral portion of the fiber layer 14 can be inserted, and an inner peripheral surface 14b is formed in the fiber layer 14 as shown in FIG. It is laminated on the surface 14d opposite to the side.

  It is also possible to attach a backup ring to the outer periphery of the resin layer 15. In this case, the sealing performance can be enhanced by applying an internal pressure to the inner peripheral surface 14b of the fiber layer. The backup ring has a structure in which an internal pressure can be applied to the inner peripheral surface 14b of the fiber layer, such as an O-ring or a garter spring, and it is desirable to select a type that generates an appropriate amount of internal pressure from the balance with the slidability.

  The cover member 16 is made of, for example, plastic or metal, and includes a cylindrical portion 16a, a ring portion 16b, and a ring-shaped attachment portion 16c as shown in FIG. Here, the cylindrical part 16a, the ring part 16b, and the attachment part 16c are integrally molded.

  Examples of the adhesive for bonding the fiber layer 14 or the resin layer 15 and the cover member 16 include an acrylic resin adhesive, an olefin adhesive, a urethane resin adhesive, an ethylene-vinyl acetate resin adhesive, and an epoxy resin. Adhesive, vinyl chloride resin adhesive, chloroprene rubber adhesive, cyanoacrylate adhesive, silicon adhesive, styrene-butadiene rubber adhesive, nitrile rubber adhesive, hot melt adhesive, phenol resin There are adhesives, melamine resin adhesives, urea resin adhesives, resorcinol adhesives, etc., a method of curing and adhering by applying and cooling the adhesive after it is heated and melted And a method of curing and adhering by heating the adhesive. As the surface to be bonded, for example, a contact surface between the cylindrical portion 16a of the cover member and the resin layer 15 or a contact surface between the ring portion 16b and the resin layer 15 can be considered.

  As shown in FIG. 1B, the cylindrical portion 16a is provided on a surface 15b on the opposite side of the resin layer 15 on which the fiber layer 14 is formed. As shown in FIG. 1B, the ring portion 16b is provided at one end of the cylindrical portion 16a. As shown in FIG. 1B, the ring portion 16b covers the surfaces 14e and 15d opposite to the surfaces 14e and 15c on the side where the female member 3 is formed in the fiber layer 14 and the resin layer 15. Configured.

  The attaching part 16c is provided in the other end part of the cylindrical part 16a, as shown in FIG.1 (b). The attachment portion 16c uses a fastening member (not shown) for the fiber layer 14 and the resin layer 15 covered with the members of the cylindrical portion 16a and the ring portion 16b at both ends in the axial direction of the female member 3. It is configured to be attachable.

  The shape of the cover member 16 is not limited to this shape as long as it can be attached to the end of the female member 3 in the axial direction. For example, an engraved portion is provided at the axial end of the female member 3, the fiber layer 14 and the resin layer 15 are inserted into this portion, and a plate-shaped cover member with holes and a resin layer 15 into which the male member 2 is inserted. The side surfaces may be bonded and attached to both or one of the axial ends of the female member 3 using a fastening member (not shown).

  Further, as described above, an engraved portion is provided in the axial end of the female member 3, and the fiber layer 14 and the resin layer 15 are inserted into this portion, so that the cylindrical portion 8 or the plate-like portion of the female member 3 is inserted. When a fixing screw (not shown) is driven and fixed from the outer peripheral portion 9 toward the resin layer 15, the cover member 16 may be unnecessary.

  Here, as an example of the manufacturing method of the sealing material 4, a relatively high viscosity resin (resin having water repellency or oil repellency after curing) is bonded or coated on one surface of a sheet-like woven fabric impregnated with rubber or the like. And then wrapping the woven fabric around the outer peripheral surface 6 of the male member 2 to form a precursor layer of the resin layer 17 and the fiber layer 14, and a sheet-like resin of the precursor layer of the fiber layer 14 A step of forming a precursor layer of the resin layer 15 by wrapping around the outer peripheral surface, applying an appropriate pressure to the outer peripheral surface of the precursor layer of the resin layer 15, and a convex portion on the inner peripheral surface of the precursor layer of the fiber layer 14 The step of forming 14c, the step of rotating the precursor layers of the fiber layer 14 and the resin layer 15 in the circumferential direction of the male member 2 and extracting them from the male member 2, the precursors of the fiber layer 14 and the resin layer 15 The body layer is cut into a donut shape, and the fiber layer 14 and the resin layer 15 are cut. May be mentioned the preparation caused by performing the process of manufacturing, the step of pasting the cover member 16 using an adhesive in the fiber layer 14 and the resin layer 15, sequentially. Naturally, when the cover member is unnecessary, the step of attaching the cover member is not necessary.

(Features of the ball screw according to this embodiment)
According to the said structure, the fiber layer 14 fitted with the male groove 7 of the male member 2 is comprised using the woven fabric impregnated with rubber | gum etc., and the male member 2 and the female member 3 are comprised. Both issues that are in a trade-off relationship, such as suppressing the entry of minute foreign matter between them and reducing the sliding resistance when the male member 2 and the female member 3 move relative to each other in the axial direction Can be solved at the same time. Further, by impregnating the fiber layer 14 with rubber or the like, it is possible to improve the wearability of the surface of the fiber layer 14 generated between the fiber layer 14 and the male member 2. Further, the cover member 16 is used to laminate the fiber layer 14 on the surface 14d on the side opposite to the surface 14b where the holes 14a are formed in the fiber layer 14, thereby using the cover member 16. 14 and the resin layer 15 can be stably attached to both ends of the female mold member 3. In addition, since the rubber layer or the resin layer 17 having water repellency or oil repellency is formed, dust, grease, oil, and the like can be prevented from entering the fiber layer 14. Deterioration can be suppressed. In addition, since the surface friction coefficient of the resin layer 17 is lower than that of the prior art, sliding wear between the male member 2 and the sealing material 4 is less likely to occur, so that the durability of the sealing material 4 is further improved. Can be improved. That is, it is possible to improve the durability life of the sealing material 4, that is, the life of the ball screw 1 as compared with the related art.

  As mentioned above, although embodiment of this invention was described based on drawing, it cannot be overemphasized that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, the example in which the pair of sealing materials 4 are attached to both ends of the female member 3 in the axial direction has been described. However, the present invention is not limited to this, and the sealing material 4 may be used depending on the use environment. It may be attached to either one of both end portions of the female member 3 in the axial direction.

  In the above embodiment, an example in which the male groove 7 of the male member 2 has a so-called four-thread structure has been described, but the present invention is not limited to this, and the number of the male grooves 7 depends on the use situation of the ball screw 1. It can be changed according to.

  In the above embodiment, the example in which the fibers of the fiber layer 14 are impregnated with rubber or the like has been described. However, the present invention is not limited to this, and the fiber layer 14 is formed using a cloth in which the fibers are formed into a sheet shape. You may do it. For example, canvas, velvet, denim, woven fabric, and knitted fabric impregnated with rubber or the like can be used. Moreover, you may employ | adopt the fiber which expands-contracts to the vertical / horizontal side, or expands / contracts to both the vertical / horizontal direction.

DESCRIPTION OF SYMBOLS 1 Ball screw 2 Male member 3 Female member 4 Seal material 5 Main-body part 6 Outer peripheral surface 7 Male groove 8 Cylindrical part 9 Plate-shaped part 10, 11 Inner peripheral surface 12 Female groove 13 Circulation path 14 Fiber layer 14a Hole 14b Inside Peripheral surface (surface inside fiber layer 14)
14c Convex part 14d-14f, 15a-15d Surface 15, 17 Resin layer (rubber layer)
16 Cover member 16a Tubular part 16b Ring part 16c Attachment part 17b Inner peripheral surface (surface inside resin layer 17)
B Ball P Orbit

Claims (3)

A male member formed with a plurality of male grooves capable of rolling a ball on the outer peripheral surface;
A female member in which a plurality of female grooves capable of rolling the ball have an inner peripheral surface formed to face the male groove, and a circulation path capable of circulating the ball;
A sealing material provided at one end or / and the other end of the female member in the axial direction;
A ball screw in which the male member and the female member are fitted in the axial direction,
The sealing material is
A hole capable of communicating with the inner peripheral surface of the female member;
A fiber that is configured to be able to fit into the male groove of the male member when the male member is inserted into the hole, and whose surface is at least one surface impregnated with rubber or resin. Layers,
A first rubber layer or a resin layer laminated on the surface opposite to the one surface in the fiber layer;
A second rubber layer or a resin layer that has water repellency or / and oil repellency, and is laminated with a predetermined thickness on the surface of the one surface of the fiber layer;
A ball screw characterized by comprising: A male member formed with a plurality of male grooves capable of rolling a ball on the outer peripheral surface;
A female member in which a plurality of female grooves capable of rolling the ball have an inner peripheral surface formed to face the male groove, and a circulation path capable of circulating the ball;
Is a seal material used for a ball screw fitted in the axial direction,
A hole capable of communicating with the inner peripheral surface of the female member;
A fiber that is configured to be able to fit into the male groove of the male member when the male member is inserted into the hole, and whose surface is at least one surface impregnated with rubber or resin. Layers,
A first rubber layer or a resin layer laminated on the surface opposite to the one surface in the fiber layer;
A second rubber layer or a resin layer that has water repellency or / and oil repellency, and is laminated with a predetermined thickness on the surface of the one surface of the fiber layer;
The sealing material characterized by having. A male member formed with a plurality of male grooves capable of rolling a ball on the outer peripheral surface;
A female member in which a plurality of female grooves capable of rolling the ball have an inner peripheral surface formed to face the male groove, and a circulation path capable of circulating the ball;
Is a seal structure applied to a ball screw fitted in the axial direction,
A hole capable of communicating with the inner peripheral surface of the female member;
A fiber that is configured to be able to fit into the male groove of the male member when the male member is inserted into the hole, and whose surface is at least one surface impregnated with rubber or resin. Layers,
A rubber layer or a resin layer that has water repellency or / and oil repellency, and is laminated with a predetermined thickness on the surface of the one surface of the fiber layer;
A seal structure characterized by comprising: