JP2012062916A - Cylinder gasket of rodless cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder gasket of a rodless cylinder that prevents occurrence of a gap at a pressure contact part with an inner seal band using a simple structure, the gap being caused by a pressure fluid in a cylinder tube.SOLUTION: A fall-preventing part 46 is formed on the both sides in the width direction of the cylinder gasket 15 inserted in a gasket groove 40 of an end cap 11. The formed fall-preventing part 46 prevents the pressure contact part (A) from separating from the inner seal band 25 by touching the side of the gasket groove 40, even when the pressure fluid in the cylinder tube 2 tends to gather at the pressure contact part (A) where the cylinder gasket 15 contacts the inner seal band 25, and to cause the pressure contact part (A) to fall or twist leading to separation thereof from the inner seal band 25.

Description

  In the present invention, the inner surface of the cylinder hole and the inner seal band are fitted in the gasket groove provided in the insertion shaft portion of the end member, and both end openings in the longitudinal direction of the cylinder hole provided in the cylinder tube are closed by the end member. And a cylinder gasket for a rodless cylinder that seals the opening at both ends of the cylinder tube.

Conventionally, a slit and a cylinder hole are provided along the longitudinal direction of the cylinder tube, the inside of the opening of the slit is closed with an inner seal band, and the longitudinal ends of the cylinder tube are closed with end members. It is fitted in the gasket groove provided in the fitting shaft part, and is pressed against the inner surface of the cylinder hole and the inner seal band in a state where the fitting shaft part of the end member is fitted to both ends of the cylinder hole in the longitudinal direction. A cylinder gasket of a rodless cylinder that seals openings at both ends is known.
The cylinder gasket described in the cited document 1 is arranged on the inner seal band side between the both end portions of the inner seal band and the inner surfaces on both sides in the width direction of the slit in a state where the inner seal band is pressed against the inner surfaces on both sides in the slit width direction. Thickness that presses against the inner surface of the inner seal band on the cylinder hole side of the inner seal band that is narrower than the protruding portion and thicker than the diameter of the portion that presses against the inner surface of the cylinder hole. By providing the meat portion, the portion corresponding to the inner seal band comes into pressure contact with the inner seal band with a large pressing force.

Japanese Patent No. 3324734

However, the gasket groove provided in the insertion shaft portion of the end member has a width in the width direction larger than that of the cylinder gasket in consideration of the variation in the cylinder gasket wire diameter. There will be a gap. However, if the pressurized fluid in the cylinder tube gathers at the pressure contact part that is in pressure contact with the inner seal band of the cylinder gasket, the pressure fluid may cause the pressure contact part to fall or twist in the gap. There was a problem that the pressurized fluid leaked from the gap formed by the part away from the inner seal band.
In view of the above problems, an object of the present invention is to provide a cylinder gasket for a rodless cylinder in which a gap is not generated in a pressure contact portion with an inner seal band by a pressurized fluid in a cylinder tube with a simple configuration. Objective.

  The present invention is used in a rodless cylinder in which a slit and a cylinder hole are provided along the longitudinal direction of the cylinder tube, the inside of the opening of the slit is closed with an inner seal band, and both longitudinal ends of the cylinder tube are closed with end members. The cylinder is fitted in the gasket groove provided in the insertion shaft portion of the member, and is pressed against the inner surface of the cylinder hole and the inner seal band in a state where the insertion shaft portion of the end member is fitted to both ends of the cylinder hole in the longitudinal direction. In the cylinder gasket of a rodless cylinder that seals the opening at both ends of the tube, the cylinder gasket is provided with anti-falling parts on both sides in the width direction of the cylinder gasket, and the anti-falling parts are in contact with one side of the gasket groove. The pressure contact part with the inner seal band does not fall to the end member side due to the pressurized fluid, and the pressure contact part becomes the inner seal bar. Characterized in that so as to prevent the leaves from de. Specifically, the fall-preventing portion comprises a plurality of protrusions provided along an annular cylinder gasket. In addition, a part of the protruding portion is provided in the vicinity of a pressure contact portion that is in pressure contact with an inner seal band of the cylinder gasket.

  In the present invention, by providing anti-falling portions on both side surfaces in the width direction of the cylinder gasket fitted in the gasket groove provided in the insertion shaft portion of the end cap, the pressure contact portion that is in pressure contact with the inner seal band of the cylinder gasket is provided. Even if the pressure fluid in the cylinder tube gathers and the pressure contact portion falls or twists by the pressure fluid and tries to move away from the inner seal band, the pressure contact portion contacts the side surface of the gasket groove. Is prevented from separating from the inner seal band, and the pressurized fluid in the cylinder tube does not leak to the outside from the press-contact portion where the inner seal band of the cylinder gasket is pressed. In addition, by providing an anti-falling portion consisting of a plurality of protrusions along the shape of the annular cylinder gasket, the cylinder gasket will not fall or twist due to the pressurized fluid in the cylinder tube. The separation from the inner seal band and the cylinder hole is prevented. In addition, by providing the protrusion of the fall prevention portion in the vicinity of the pressure contact portion that is in pressure contact with the inner seal band of the cylinder gasket, the pressure contact portion is reliably prevented from separating from the inner seal band by the pressurized fluid in the cylinder tube. .

It is a figure which shows a rodless cylinder. It is a longitudinal cross-sectional view of FIG. It is the III-III sectional view taken on the line of FIG. It is a figure which shows the state which made the inner seal band press-contact with the cylinder tube. It is a figure which shows the cylinder gasket of this invention. It is a figure which shows other embodiment of a cylinder gasket.

  The cylinder tube 2 of the rodless cylinder 1 shown in FIG. 1 is formed by extruding or drawing a non-magnetic material, has a non-circular cylinder hole 3, and a slit 4 is formed over the entire length in the longitudinal direction. It is. As shown in FIG. 4, in addition to the cylinder hole 3 and the slit 4, the cylinder tube 2 has an end member mounting groove 5 and a sensor mounting groove 6 parallel to the cylinder hole 3 on the left and right side wall outer surfaces in the width direction. And are formed.

  The cylinder hole 3 is an oval non-circular cylinder hole, and a slit-side inner surface 7 that is a flat surface and a slit-facing side inner surface 8 that faces the slit 4 are continuous by arc-shaped inner surfaces 9 on both sides of the slit 4. 7, the inner surfaces 10 on both sides in the width direction are formed continuously on the both sides in the width direction of the slit 4 and formed in arcuate surfaces that are convexly curved toward the outside of the cylinder tube 2.

  Both longitudinal ends of the cylinder tube 2 are closed by left and right end caps 11 shown as end members, and a cylinder chamber 13 is formed between the left and right end caps 11. The end cap 11 has a plurality of tapping pins in the mounting groove 5 for mounting the end member in a state in which the insertion shaft portion 14 of the end cap 11 into which the cylinder gasket 15 is fitted is fitted into the cylinder tube 2 and the opening portions at both ends of the cylinder hole 3. It is attached by screwing in the screw 16.

  The cylinder chamber 13 is divided into front and rear cylinder chambers 13A and 13B by a piston 18 having piston ends 18b at both ends of the piston body 18a. A piston yoke 19 penetrating the slit 4 is integrally formed in the piston body 18a. The piston yoke 19 extends left and right outside the cylinder tube 2 to form a piston mount 20. The piston mount 20 closes a band passage space 21 through which the outer seal band 26 passes with a cover member 22 made of a resin material. The piston 18, the piston yoke 19, and the piston mount 20 constitute a moving body 23. A scraper 24 is attached to the entire outer periphery of the lower end of the piston mount 20 to prevent dust from entering from a gap between the upper surface of the cylinder tube 2 and the lower surface of the piston mount 20.

  The inner and outer sides of the slit 4 are closed by inner and outer seal bands 25 and 26. The inner and outer seal bands 25, 26 pass above and below the piston yoke 19, and both ends thereof are connected to the left and right end caps 11. The inner and outer seal bands 25 and 26 are thin flexible elastic bands, and are made of a magnetic material such as a steel band. As is well known, the inner and outer seal bands 25 and 26 have a width larger than the width of the slit 4. Out of these, the outer seal bands 25 and 26 are adsorbed by magnets 31 arranged along the length on both sides of the slit 4 on the outer surface of the cylinder tube 2, except for a portion passing through the piston yoke 19. The band 25 closes the slit 4 from the inside by the magnetic adsorption force and the fluid pressure applied to the cylinder chamber 13, and the outer seal band 26 closes the slit 4 from the outside by the magnetic adsorption force.

  As shown in FIG. 4, the inner seal band 25 is chamfered by inclined surfaces 33 whose both end portions in the width direction of the inner surface 25a facing the cylinder hole 3 are inclined toward the edge portion, and the outer surface 25b on the opposite side thereof. The end portions in the width direction are pressed against the inner surfaces 10 on both sides in the width direction of the slit 4, and the recesses 34 are formed by both end portions of the inner seal band 25 and the inner surfaces 10 on both sides in the width direction.

  The end cap 11 is formed with band insertion holes 27 and 28 into which the inner and outer seal bands 25 and 26 are respectively fitted. Further, a pin hole 29 extending in the vertical direction and penetrating the band insertion holes 27 and 28 is provided. The longitudinally opposite ends of the inner and outer seal bands 25, 26 are fitted into the band insertion holes 27, 28, and the attachment holes 30 (not shown) provided at both ends are aligned with the pin holes 29. The inner and outer seal bands 25 and 26 are connected to the end cap 11. A cap cover 32 is attached to the end cap 11 to prevent the attachment pin 30 from coming off from above.

  The end cap 11 is formed with a fitting shaft portion 14 that is fitted into the cylinder hole 3. The insertion shaft portion 14 has an oval shape corresponding to the shape of the cylinder hole 3. The large diameter portion 35 of the fitting shaft portion 14 is fitted into the cylinder hole 3. A piston damper 38 is integrally attached to the fitting shaft portion 14. A gasket groove 40 into which the cylinder gasket 15 is fitted is constituted by the insertion shaft portion 14 and the piston damper 38 attached to the insertion shaft portion 14. The piston damper 38 is provided with a supply / discharge hole 43 communicating with the supply / discharge hole 42 of the end cap 11.

  As shown in FIG. 5, the cylinder gasket 15 fitted in the gasket groove 40 is formed in an oval annular shape in accordance with the shape of the gasket groove 40. On the inner seal band 25 side of the cylinder gasket 15, it has a shape corresponding to a recess 34 formed between both ends in the width direction of the inner seal band 25 and the inner surfaces 10 at both ends in the width direction, and a protrusion 44 that enters the recess 34. Is provided. Between the projections 44 is a thick portion 45 that is in pressure contact with the inner side surface 25a of the inner seal band 25. The thick-walled portion 45 is thinner (thin) in wire diameter (thickness in the compression direction) than the protrusion 44, and thicker (thicker) than the wire diameter of the other portion that is in pressure contact with the inner surface of the cylinder hole 3.

  On the both side surfaces in the width direction of the cylinder gasket 15 of the present invention, the fall prevention portions 46 are formed so as to protrude. The anti-falling portion 46 includes a plurality of protrusions 47 provided along the shape of the annular cylinder gasket 15. A part of the projecting portion 47 is provided in the vicinity of the press-contact portion A composed of the projection 44 and the thick portion 45 that press-contact the inner seal band 25 of the cylinder gasket 15. The length L1 between the protrusions 47 is set to be substantially the same as the length L2 of the gasket groove 40 in the width direction. In the present embodiment, the fall-preventing portion 46 is composed of a plurality of protruding portions 47, but may be a protruding portion 47A along the shape of the annular cylinder gasket 15 as shown in FIG. Furthermore, although the fall-preventing portions 46 are provided on both side surfaces of the cylinder gasket 15 in the width direction, the fall-preventing portions 46 having the protrusion length L1 may be provided only on one side surface. When the fitting shaft portion 14 is fitted into the opening on both ends of the cylinder tube 2 with the cylinder gasket 15 fitted in the gasket groove 40, the cylinder gasket 15 is pressed against the inner surface of the cylinder hole 3 and the inner seal band 25 from the inside. The openings at both ends of the cylinder tube 2 are sealed.

  In the rodless cylinder 1 configured as described above, the fall-preventing portions 46 are provided on both side surfaces in the width direction of the cylinder gasket 15 fitted in the gasket groove 40 provided in the fitting shaft portion 14 of the end cap 11. Thus, the pressurized fluid in the cylinder tube 2 gathers at the pressure contact portion A that is in pressure contact with the inner seal band 25 of the cylinder gasket 15, and the pressure contact portion A falls or twists due to the pressure fluid, so that it is separated from the inner seal band 25. However, since the fall-preventing portion 46 abuts against the side surface of the gasket groove 40, the pressure contact portion A is prevented from moving away from the inner seal band 25, and the pressure contact portion A that is in pressure contact with the inner seal band 25 of the cylinder gasket 15 is prevented. The pressurized fluid in the cylinder tube 2 does not leak to the outside. Further, by providing the anti-falling portion 46 including the plurality of protrusions 47 along the shape of the annular cylinder gasket 15, the cylinder gasket 15 does not fall or twist due to the pressurized fluid in the cylinder tube 2. Therefore, the cylinder gasket 15 can be prevented from separating from the inner seal band 25 and the cylinder hole 3. Further, by providing the protrusion 47 of the fall prevention portion 46 in the vicinity of the pressure contact portion A that is in pressure contact with the inner seal band 25 of the cylinder gasket 15, the pressure contact portion A is separated from the inner seal band 25 by the pressurized fluid in the cylinder tube 2. It can be surely prevented from leaving.

DESCRIPTION OF SYMBOLS 1 Rodless cylinder 2 Cylinder tube 3 Cylinder hole 4 Slit 11 End cap 14 Insertion shaft part 15 Cylinder gasket 25 Inner seal band 40 Gasket groove 46 Fall prevention part 47 Protrusion part A Pressure contact part

Claims (3)

A slit and a cylinder hole are provided along the longitudinal direction of the cylinder tube, the inside of the slit opening is closed with an inner seal band, and the longitudinal ends of the cylinder tube are closed with end members. The cylinder tube is fitted in the gasket groove, and is pressed against the inner surface of the cylinder hole and the inner seal band in a state in which the insertion shaft portion of the end member is fitted to both ends of the cylinder hole in the longitudinal direction. In the cylinder gasket of a rodless cylinder that seals the cylinder gasket, the cylinder gasket is provided with a tilt-proof portion on both side surfaces in the width direction, and the tilt-proof portion is brought into contact with one side surface of the gasket groove so that the pressure fluid in the cylinder tube Make sure that the pressure contact part with the inner seal band does not fall toward the end member, and that the pressure contact part is separated from the inner seal band. Cylinder gasket rodless cylinder, characterized in that the prevent that one. 2. A cylinder gasket for a rodless cylinder according to claim 1, wherein the anti-falling portion comprises a plurality of protrusions provided along an annular cylinder gasket. The cylinder gasket for a rodless cylinder according to claim 1 or 2, wherein a part of the protrusion is provided in the vicinity of a pressure contact portion that is in pressure contact with an inner seal band of the cylinder gasket.

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