JP4072768B2 - 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 invention is intended to provide a double dustproof structure of an outer moving body with a simple structure in a slide unit in which a slit is closed with an outer seal band. In particular, the structure described above is extremely easy and inexpensive to assemble. It is what we propose.

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 a slide unit that includes 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 that can be fitted to the outer periphery of the outer moving body on the sliding contact sheet according to the outer peripheral shape of the outer moving body A hole is formed, and the fitting hole of the sliding contact sheet is fitted into 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 seal band. on the opposite side of the slide unit body outer surface and the sliding contact surface of the contact sheet, the elasticity of the sliding contact sheet The swell by utilizing the elasticity of the elastic pressing ring itself fitted elastically, characterized dual dustproof structure of the slide unit which is adapted to retaining the sliding seat by the elastic pressing ring. The elastic retainer ring is preferably an O-ring. As the sliding contact sheet, a felt sheet whose thickness is larger than the distance between the outer movable body and the slide unit main body is optimal, but in addition, the outer surface of the slide unit main body and the outer seal band outer surface such as nonwoven fabric and woven fabric are slidably contacted. Any sheet may be used as long as it can clean the outer surfaces thereof and prevent an unnecessary object from entering the outside moving body.
It is more preferable if the connecting pin for connecting the external moving body and the internal moving body is protruded on both sides in the width direction of the external moving body and extended to the upper side of the elastic pressing ring so as to also serve as a pin for preventing the elastic pressing ring from coming off. .

In the present invention, a fitting hole that can be fitted to the outer periphery of the outer moving body is formed in the sliding contact sheet in accordance with the outer peripheral shape of the outer moving body, and the fitting hole of the annular sliding contact sheet is fitted to the outer periphery of the outer moving body side surface. In addition, an elastic holding ring such as an O-ring (O-ring) is fitted to the outer periphery of the outer moving body using the elasticity of the elastic holding ring itself, and the sliding contact sheet is arranged outside the scraper. Compared to the dust-proof structure, a double dust-proof structure that is really simple and inexpensive can be achieved, and dust and chips can be effectively prevented from entering the outside moving body.
Further, since the O-ring is used as the elastic presser ring, it is not necessary to arrange a special presser member, and it can be manufactured at a lower cost.
Further, when the connecting pin also serves as a pin for preventing the elastic retainer ring from coming off, the elastic retainer ring can be prevented from coming off upward with a simple configuration.

  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 thickness of the felt sheet 20 is slightly larger than the distance between the lower surface of the piston mount 12 and the tube outer surface 2a. 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. From the upper side of the felt sheet 20, an elastic press ring (annular rubber ring: O-ring in this case) 22 is fitted to the outer periphery of the side surface of the piston mount 12 by using its own elasticity, and the felt sheet 20 is pressed so as not to come out upward. It is crowded.

  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 In the configuration of the present application, since the felt seat 20 is fitted into the outer periphery of the piston mount 12 and the O-ring 22 is fitted from the upper side, the assembly is very easy and can be manufactured at a low cost. There are advantages.

  The O-ring 22 tightens the peripheral surface of the piston mount 12 with its elasticity and does not come off easily. However, depending on the use over a long period of time, there is a concern that the O-ring 22 may gradually move upward due to vibration or other causes. . Therefore, in FIG. 4, the connecting pin 12 a that connects the piston mount 12 and the protruding portion 11 a 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 22 as a presser ring. 22 is prevented from coming off upward. In this embodiment, the connecting pin 12a is made slightly longer than the standard one to prevent the O-ring 22 from coming off upward. In addition to the connecting pin 12a, the O-ring 22 is separately provided. The configuration is simple compared to the case of providing a detachment prevention pin. In addition to the connecting pin 12a, if an anti-disengagement pin similar to the connecting pin 12a is separately provided at the front and rear end portions of the piston mount 12 in the traveling direction, the O-ring 22 is moved forward and backward during the movement of the piston mount 12. It can be surely prevented from rolling up at the part.

  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. This is another embodiment.

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 Insertion hole 22 O-ring (holding ring)

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. In the 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, a fitting hole that can be fitted into the outer periphery of the outer moving body is formed in the sliding contact sheet in accordance with the outer peripheral shape of the outer moving body. The sliding contact sheet is fitted into the outer movable body so that the sliding contact sheet is in sliding contact with the outer surface of the slide unit main body and the outer seal band, and the outer movable body is slid. on the opposite side of the unit body outer surface and the sliding contact surface, the resilient retaining ring of the sliding sheet Double dustproof structure of the slide unit, wherein the utilizing the elasticity of the elastic pressing ring itself fitted elastically and so as to retaining the sliding seat by the elastic pressing ring. 2. A double dustproof structure for a slide unit according to claim 1, wherein the sliding contact sheet is a felt sheet having a thickness larger than a distance between the outer movable body and the slide unit main body. The double dustproof structure for a slide unit according to claim 1 or 2, wherein the elastic retainer ring is an O-ring. The connecting pin that connects the external moving body and the internal moving body protrudes on both sides in the width direction of the external moving body and extends above the elastic presser ring, and also serves as a pin for preventing the elastic presser ring from coming off. The double dustproof structure of the slide unit according to any one of Items 1 to 3.

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