JP4072771B2 - Double dustproof structure of slide unit - Google Patents

Description

  In this slide unit, the movement of the inner moving body inside the slide unit main body is taken out from the slit of the main body to move the outer moving body, and in particular, the inner portion of the outer moving body is protected from dust and chips. The present invention relates to a dustproof structure that prevents dust from entering the cylinder.

Conventionally, as described in Patent Document 1, a dust-proof brush is attached to surround the outer periphery of the outer moving body of the slit-type rodless cylinder, and a double dust-proof structure is formed together with a scraper provided in the outer moving body. It is known.
In addition, as described in Patent Document 2, in which the outer moving body of the slit-type rodless cylinder is guided by the guide rail, the one having a dustproof brush outside the scraper is also known.
Patent Document 3 discloses that an O-ring is used as a pressing member of a scraper mounted on the lower surface of an outer moving body of a rodless cylinder. Patent Document 4 discloses a double dustproof structure in which a felt is disposed outside a scraper in a hydraulic jack.
JP-A-8-93717 JP-A-8-121411 Japanese Patent No. 3158398 JP-A-5-310383

The techniques of Patent Documents 1 and 2 have a problem that the structure for mounting the brush is complicated and cannot be manufactured at low cost. Patent Document 4 does not suggest application to a slide unit having a slit.
The present application is to provide a double dustproof structure of a simple outer moving body having a structure capable of reliably maintaining a dustproof function over a long period in a slide unit in which a slit is closed with an outer seal band.

The present invention connects an inner moving body inside the slide unit main body having a slit in the longitudinal direction and an outer moving body outside the slide unit main body through the slit, the slit is closed with an outer seal band, and at least the outer moving body In the slide unit having a scraper that slides in contact with the outer surface of the slide unit main body and the outer surface of the outer seal band before and after the moving direction, a fitting hole is formed in the sliding contact sheet according to the outer peripheral shape of the outer moving body, and the annular sliding contact is formed. A seat fitting hole is fitted into the outer moving body so that the sliding contact sheet is slidably in contact with the outer surface of the slide unit main body and the outer seal band, and the outer moving body is attached to the outer surface of the slide unit main body of the sliding contact sheet. on the opposite side of the sliding contact surfaces, the holding ring of the sliding sheet while elastically fitted Characterized in that a said sliding seat slide unit body outer surface and the burr migration prevention member opposite to the surface was set to hold down the slide unit body side sliding contact surface of the moving direction around the outer moving body ( Claim 1). The presser ring is preferably an O-ring. Felt sheets are optimal as the sliding contact sheet, but other items such as non-woven fabric and woven fabric are slidably contacted with the outer surface of the slide unit main body and the outer surface of the outer seal band to clean the outer surface, so that unnecessary items are inside the outer moving body. Any sheet can be used as long as the sheet can be prevented from entering.
Further, the present invention comprises a pin-up prevention member constituted by a pin member protruding so as to press the pressing ring from the upper side from the front and rear portions in the moving direction of the outer moving body toward the front in the traveling direction. The sliding unit has a double dustproof structure that prevents the sliding contact sheet from being rolled up by pressing the sliding contact sheet through the presser ring (Claim 2). Further, the present invention provides an annular thin plate in which the curling up prevention member is formed in a size corresponding to the annular sliding contact sheet and is fitted on the outer periphery of the outer movable body, and is interposed between the presser ring and the sliding contact sheet. It is characterized by a double dustproof structure of the slide unit that is configured to hold the sliding contact sheet over its entire circumference with the annular thin plate so as to prevent the sliding contact sheet from rolling up over the entire circumference ( Claim 3).

In the present invention, the annular sliding contact sheet is inserted into the outer periphery of the outer side surface of the outer moving body, and a presser ring such as an O-ring (O-ring) is inserted into the outer periphery of the outer moving body. Because it is arranged, it can be a simple and inexpensive double dustproof structure compared to the conventional double dustproof structure, effectively preventing dust and chips from entering the outside moving body Can be prevented. In addition, there is a roll-up prevention member that presses the surface on the opposite side of the slide unit main surface of the sliding contact sheet to the slide unit main body side before and after the moving direction of the outer moving body. It is possible to prevent the front and rear portions of the sliding contact sheet from being turned up by reciprocating movement of the body by pressing the turn-up prevention member, and the dustproof function can be maintained for a long time.
Further, in the present invention, the flip-up preventing member is constituted by a pin member protruding so as to press the presser ring from the upper side from the front and rear portions in the moving direction of the outer moving body toward the front in the moving direction, and by these pin members Since the sliding contact sheet is pressed down through the presser ring to prevent the front and rear portions of the sliding contact sheet from turning up, the pin member prevents the front and rear portions of the sliding contact sheet from turning up and down due to the reciprocating movement of the outer moving body. This can be prevented through the presser ring, and the dustproof function can be maintained for a long time. Further, in the present invention, the ring-up prevention member is formed in a size corresponding to the annular sliding contact sheet, fitted into the outer periphery of the outer movable body, and interposed between the press ring and the sliding contact sheet. The sliding thin sheet is pressed around the entire circumference with the annular thin plate to prevent the sliding sheet from rolling up over the entire circumference. It can be prevented with a thin plate, and the entire outer moving body can be effectively dust-proof.
Further, in the present invention, since the O-ring is used as the presser ring, it is not necessary to arrange a special presser ring and can be manufactured at a lower cost.

  Hereinafter, the present invention will be described in detail with reference to an embodiment in which the present invention is applied to a rodless fluid pressure cylinder (hereinafter simply referred to as a rodless cylinder) which is one form of a slide unit. 1 and 2 show a rodless cylinder 1 of this embodiment. A cylinder tube (slide unit main body) 2 of the rodless cylinder 1 is formed in a square shape in cross section, and the cylinder tube 2 A cylinder chamber 3 is formed inside, and a slit 4 communicating with the cylinder chamber 3 is opened over the entire length of the cylinder tube 2 at the center of the upper surface (outer surface in the mounting direction) 2 a of the tube 2. End caps 7 provided with ports 6 for supplying and discharging pressurized fluid are respectively fixed to both ends of the cylinder tube 2, and pistons (inner moving bodies) are placed in the cylinder chamber 3 in the cylinder tube 2. 8 is slidably fitted. The piston 8 divides the cylinder chamber 3 into left and right cylinder chambers 3A and 3B.

  An inner seal band 9 and an outer seal band 10, both ends of which are fixed to the left and right end caps 7, are provided inside and outside the slit 4 that opens over the entire length of the cylinder tube 2. Intrusion of dust and the like from the outside is prevented. A piston yoke 11 that moves while expanding the inner seal band 9 and the outer seal band 10 inward and outward as the piston 8 slides is located at the center of the piston 8 fitted into the cylinder tube 2. A part of the piston yoke 11 is projected to the outside of the cylinder tube 2 through the slit 4, and a piston mount (external moving body) 12 is connected to the projecting portion 11 a of the piston yoke 11 with two coupling pins on the front and rear. The piston mount 12 can be reciprocated at a predetermined stroke in the axial direction as the piston 8 in the cylinder tube 2 slides.

  A scraper 15 is attached to the lower surface of the piston mount 12 (the surface facing the outer surface 2a of the cylinder tube 2) over the entire circumference. In the slit width direction of the piston mount 12, the scraper 15 slidably contacts the outer surface 2a of the cylinder tube. The scraper 15 is in sliding contact with the outer surface 2a of the cylinder tube and the outer surface (the upper surface facing the piston mount 12) 10a of the outer seal band 10 before and after the moving direction of the piston mount 12.

  As shown in FIG. 3, the felt sheet 20 as a sliding contact sheet is formed in a rectangular annular sheet in which a rectangular fitting hole 21 is formed in accordance with the outer peripheral shape of the side surface of the piston mount 12. The felt sheet 20 is inserted into the outer periphery of the piston mount 12 by inserting the fitting hole 21 into the lower part of the piston mount 12 so that the lower surface of the felt sheet 20 comes into contact with the tube outer surface 2 a and the outer surface 10 a of the outer seal band 10. Attached to. Reference numeral 22 denotes an annular thin plate made of an aluminum plate as a roll-up prevention member. A rectangular fitting hole 23 is formed in accordance with the outer peripheral shape of the side surface of the piston mount 12 and is formed in a size corresponding to the felt sheet 20. Yes. The annular thin plate 22 is fitted on the outer periphery of the piston mount 12 from the upper side of the felt sheet 20, and an elastic press ring (annular rubber ring: O-ring in this case) 24 is disposed on the outer periphery of the side surface of the piston mount 12 from the upper side of the annular thin plate 22. It is fitted in using its own elasticity. In order to prevent the O-ring 24 from loosening upward, the connecting pin 12a that connects the piston mount 12 and the protruding portion 11a of the piston yoke 11 protrudes on both sides in the width direction of the piston mount 12 and extends to above the O-ring 24. Thus, the O-ring 24 is prevented from coming off upward, and the piston mount 12 is further provided with presser pins 12b before and after the connecting pin 12a. In this way, the felt sheet 20 is pressed through the annular thin plate 22 so as not to move upward.

  According to this configuration, when the piston mount 12 moves outside the cylinder tube 2 by the movement of the piston 8, the felt sheet 20 is disposed in front of the scraper 15 in the moving direction. Since the piston mount 12 reciprocates while removing unnecessary materials adhering to the tube outer surface 2a and the outer surface 10a of the outer seal band 10 by heavy dust-proof means, such unnecessary materials are prevented from entering the piston mount 12. The Further, since the felt sheet 20 is pressed through the thin annular plate 22 over the entire circumference thereof, even if the piston mount 12 reciprocates, the felt sheet 20 including the front and rear portions in the reciprocating movement direction is completely removed. It is prevented from rolling up over the circumference, and the double dustproof function with the scraper 15 is maintained for a long time.

  4 to 6, instead of using the annular thin plate 22, the felt seat 20 similar to that of the first embodiment is directly pressed onto the piston mount 12 by the O-ring 24, and the upper side of the O-ring 24 is the same as described above. A pin member 25 for pressing the O-ring 24 from above is protruded from the front and rear portions of the piston mount 12 toward the front in the traveling direction simultaneously with being pressed by the connecting pin 12a and the presser pin 12b. Even in this configuration, the front and rear portions of the felt sheet 20 can be prevented from turning up by the pin member 25 via the O-ring 24.

  In the above embodiment, the present invention is applied to a rodless cylinder by fluid pressure operation, but the present application is not limited to this, a slide unit in which the inner moving body moves by a known feed screw mechanism, a slide unit that moves by a revolving belt, a rack and pinion The present invention can be applied to various types of slide units such as a slide unit that moves by a mechanism.

It is sectional drawing of the rodless cylinder which is one Embodiment of a slide unit. It is the II-II sectional view taken on the line of FIG. It is a whole perspective view which shows an assembly | attachment. 6 is a longitudinal sectional view of Example 2. FIG. It is VV sectional drawing of FIG. FIG. 5 is a plan view of FIG. 4.

Explanation of symbols

2 Cylinder tube (slide unit body)
4 Slit 8 Piston (inner moving body)
10 Outer seal band 12 Piston mount (outside moving body)
12a Connecting pin 15 Scraper 20 Felt sheet (sliding contact sheet)
21 Fitting hole 22 Annular thin plate
24 O-ring (presser ring)
25 Pin member (Spreading prevention member)

Claims (4)

An inner moving body inside the slide unit main body having a longitudinal slit and an outer moving body outside the slide unit main body are connected through the slit, and the slit is closed with an outer seal band, at least before and after the moving direction of the outer moving body. Is a slide unit having a scraper that is in sliding contact with the outer surface of the slide unit main body and the outer surface of the outer seal band, and a fitting hole is formed in the sliding contact sheet in accordance with the outer peripheral shape of the outer movable body, and the fitting hole of the annular sliding contact sheet is formed Is attached to the outer moving body so that the sliding contact sheet is in sliding contact with the outer surface of the slide unit main body and the outer surface of the outer seal band, and the outer moving body has a surface in sliding contact with the outer surface of the slide unit main body . on the opposite side, the retaining ring of the sliding sheet while elastically fitted, outer movement Second slide unit, wherein said providing the burr migration prevention member the opposite surface was set to hold down the slide unit body side of the slide unit body outer surface and the sliding contact surface of the sliding sheet in the direction of movement before and after the Heavy dustproof structure. The flip-up prevention member is constituted by a pin member protruding so as to press the presser ring from the upper side from the front and rear portions in the moving direction of the outer moving body toward the front in the moving direction, and the pin member slides through the presser ring by the pin member. 2. The double dustproof structure for a slide unit according to claim 1, wherein the contact sheet is pressed down to prevent the front and rear portions of the slide contact sheet from turning up. The turn-up prevention member is formed of an annular thin plate that is formed in a size corresponding to the annular sliding contact sheet and is fitted on the outer periphery of the outer movable body, and is interposed between the presser ring and the sliding contact sheet. 2. A double dustproof structure for a slide unit according to claim 1, wherein the sliding contact sheet is pressed down over the entire circumference with a thin plate to prevent the sliding contact sheet from rolling up over the entire circumference. The double dustproof structure for a slide unit according to any one of claims 1 to 3, wherein the sliding contact sheet is a felt sheet, and the presser ring is an O-ring.

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