JP5343182B2 - Fluid pressure cylinder - Google Patents

Description

  The present invention relates to a fluid pressure cylinder in which a piston is displaceably provided inside a cylinder tube.

  The present applicant has proposed a fluid pressure cylinder including a piston driven by a pressure fluid as a driving means for conveying and positioning a workpiece or driving various industrial machines (see Patent Document 1). In the fluid pressure cylinder, a piston is inserted into a cylindrical cylinder tube so as to be displaceable, and a piston rod connected to the piston is supported by a rod cover so as to be displaceable. Then, when the pressure fluid is introduced into the cylinder tube from the ports provided in the cylinder tube and the rod cover, the piston and the piston rod are displaced along the axial direction.

  In such a fluid pressure cylinder, there is a cylinder in which a scraper is provided on the inner peripheral surface of the rod cover facing the piston rod to prevent dust or the like adhering to the piston rod from entering the cylinder tube. However, the fluid pressure cylinder having such a configuration cannot prevent the dust generated in the cylinder tube from being discharged to the outside.

JP 7-167115 A

  The present invention has been made in connection with the above-described problems, and is a fluid pressure capable of suitably preventing dust from entering and discharging outside and improving maintenance and durability. The object is to provide a cylinder.

In order to achieve the above object, the present invention comprises a cylinder tube formed in a cylindrical shape,
A piston that is built in the cylinder tube and that is displaced along the axial direction under the action of a pressure fluid supplied into the cylinder chamber;
A piston rod coupled to the piston;
A cover member that has a first hole through which the piston rod is inserted, and is attached to an end of the cylinder tube;
A holder provided detachably with respect to the cover member, and having a second hole portion into which the dust rod removing member that is in contact with the outer peripheral surface of the piston rod is mounted,
With
The dust removing member is made of a fiber material containing a lubricant.

  According to the present invention, the holder is detachably provided to the cover member through which the piston rod is inserted, the dust removing member containing the lubricant in contact with the outer peripheral surface of the piston rod in the second hole portion of the holder. Wearing. When the piston rod is displaced along the axial direction in accordance with the displacement of the piston, dust or the like adhering to the outer peripheral surface is suitably absorbed and removed by the dust removing member.

  Therefore, dust adhering when the piston rod protrudes to the outside of the rod cover can be suitably prevented by the dust removing member from entering the inside of the cylinder tube, and conversely, dust generated in the cylinder tube is prevented. Further, it can be suitably prevented from being discharged to the outside of the fluid pressure cylinder.

  Further, even when the dust removing performance of the dust removing member is lowered, it is possible to simply replace the dust removing member via the holder and obtain the desired removing performance again. That is, it is possible to improve maintainability when replacing the dust removing member.

  Furthermore, since the piston rod is suitably lubricated by the lubricant contained in the dust removing member, the durability of the packing or the like in contact with the piston rod can be improved, and the life can be extended.

  Furthermore, the holder can be easily and reliably mounted by being fixed to the cover member by a fixing means.

Still further, in the first hole portion, a guide member that supports the outer peripheral surface of the piston rod so as to be displaceable along the axial direction;
A packing that abuts the outer peripheral surface of the piston rod and blocks communication between the cylinder chamber and the outside of the cylinder tube;
With
The guide member, packing, and dust removing member may be arranged in parallel along the axial direction of the piston rod.

  According to the present invention, the following effects can be obtained.

  That is, by providing a holder with a dust removing member detachably with respect to a cover member through which the piston rod is inserted, dust or the like attached to the piston rod as the piston rod is displaced is removed from the dust. It can be suitably removed by the member. Therefore, it is possible to suitably prevent the dust from entering the fluid pressure cylinder from the outside, and to suitably prevent the dust generated inside the fluid pressure cylinder from being discharged to the outside.

  In addition, since the dust removing member can be easily replaced through the holder, it is possible to improve the maintainability, and the piston rod is suitably lubricated by the lubricant contained in the dust removing member. It is possible to improve the durability of the packing that is in contact with the piston rod.

  A preferred embodiment of a fluid pressure cylinder according to the present invention will be described below and described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a fluid pressure cylinder according to an embodiment of the present invention.

  As shown in FIGS. 1 to 4, the fluid pressure cylinder 10 includes a cylinder tube 12 formed in a bottomed cylindrical shape, and a rod cover (cover member) attached to an open end of the cylinder tube 12. 14, a piston 16 displacing the inside of the cylinder tube 12 along the axial direction (arrow A, B direction), a piston rod 18 connected to the piston 16, and the rod cover 14. Holder 20.

  The cylinder tube 12 is made of, for example, a metal material, and a first port 22 through which pressure fluid is supplied and discharged is formed on the side surface of the one end portion 12a. The first port 22 communicates with a communication chamber 26 formed inside the cylinder tube 12 through a communication path 24a. A cylinder chamber 28 is formed in the cylinder tube 12 along the axial direction (arrows A and B directions), and the piston 16 is disposed in the cylinder chamber 28 so as to be displaceable. The cylinder chamber 28 includes a first cylinder chamber 28 a formed between the piston 16 and the closed end portion 12 a of the cylinder tube 12, and a second cylinder formed between the piston 16 and the rod cover 14. Chamber 28b. That is, the first cylinder chamber 28a communicates with the first port 22 through the communication chamber 26 and the communication passage 24a.

  The rod cover 14 is formed of, for example, a metal material, and a threaded portion 30 is engraved at one end thereof, and is integrally connected by being screwed to the opening end of the cylinder tube 12. At this time, the seal member 32 attached to the open end of the cylinder tube 12 contacts the end surface of the rod cover 14. Thereby, airtightness in the cylinder chamber 28 is suitably maintained, and the pressure fluid in the cylinder chamber 28 is prevented from leaking to the outside through between the rod cover 14 and the cylinder tube 12.

  A second port 34 through which pressure fluid is supplied and discharged is formed on the side surface of the rod cover 14, and the second port 34 communicates with a first rod hole (first hole) 36 through a communication path 24 b. . The first rod hole 36 penetrates the central portion of the rod cover 14 along the axial direction (arrows A and B directions), and the piston rod 18 is inserted through the first rod hole 36 so as to be displaceable.

  A bush (guide member) 38 is attached to the first rod hole 36 through an annular groove at a substantially central portion along the axial direction, and on the other end side of the rod cover 14 adjacent to the bush 38. A rod packing (packing) 40 is mounted via an annular groove. The bush 38 is formed, for example, from a metal material into a ring shape having a substantially rectangular cross section, and the inner peripheral surface thereof is in contact with the outer peripheral surface of the piston rod 18. When the piston rod 18 is displaced along the axial direction (arrows A and B directions), the piston rod 18 is supported in a freely displaceable manner by contacting the outer peripheral surface thereof.

  For example, the rod packing 40 is formed in a ring shape from an elastic material such as rubber, and has a substantially V-shaped cross section that opens toward the bush 38 (in the direction of arrow A).

  The other end of the rod cover 14 is provided with a convex portion 42 protruding at a predetermined height along the axial direction (arrow B direction) at the substantially central portion, and the holder 20 is fitted to the convex portion 42. In addition, a plurality of (for example, four) screw holes 44 are provided in the radially outward direction with the convex portion 42 as the center (see FIGS. 3 and 4). The screw holes 44 open at the end surface of the rod cover 14, extend at a predetermined depth along the axial direction (arrow A direction) of the rod cover 14, and are spaced apart from each other at equal intervals.

  The piston 16 is made of, for example, a metal material such as an aluminum alloy, and is inserted into one end side (arrow A direction) of the piston rod 18 to be engaged with the step portion 46 of the piston rod 18. The one end of 18 is connected by screwing.

  A plurality of annular grooves are formed on the outer peripheral surface of the piston 16 at predetermined intervals along the axial direction of the piston 16 (in the directions of arrows A and B). The annular groove has a rod cover 14 side (arrow B). The piston packing 48, the magnet 50, and the wear ring 52 are mounted in order from the direction (see FIG. 1). In other words, the air tightness of the first and second cylinder chambers 28a, 28b in the cylinder tube 12 is suitably maintained by the piston packing 48, and the magnet 50 is connected via position detecting means (not shown) provided in the cylinder tube 12. By detecting, the position along the axial direction (arrow A, B direction) of the piston 16 can be detected.

  A pair of buffer members 54 a and 54 b are provided on both end faces of the piston 16 so as to face the closed one end 12 a of the cylinder tube 12 and the rod cover 14. The buffer members 54a and 54b are formed in a plate shape having a predetermined thickness from an elastic material such as rubber, for example, and at one end of the rod cover 14 and the cylinder tube 12 at the displacement end position where the piston 16 is displaced along the axial direction. The impact at the time of contact with the portion 12a is buffered.

  The piston rod 18 is made of, for example, a metal material such as iron, and a thin shaft portion 56 to which the piston 16 is connected is formed on one end side (arrow A direction), and the other end side (arrow B). In the direction), a thick shaft portion 58 having a diameter larger than that of the thin shaft portion 56 is formed. A stepped portion 46 is provided between the thin shaft portion 56 and the thick shaft portion 58. The thick shaft portion 58 is inserted into the first rod hole 36 of the rod cover 14 and is supported through the bush 38 so as to be displaceable along the axial direction. Further, when the rod packing 40 comes into contact with the outer peripheral surface of the thick shaft portion 58, leakage of the pressure fluid from between the first rod hole 36 and the piston rod 18 is prevented.

  The holder 20 is made of a metal material such as an aluminum alloy, for example, and is disposed on the other end side (arrow B direction) of the rod cover 14. A concave portion 60 is formed in a substantially central portion on one end face facing the rod cover 14, and the concave portion 60 is fitted to the convex portion 42 of the rod cover 14, so that the holder 20 and the rod cover 14 are fitted. Are positioned on the same axis.

  The holder 20 has a second rod hole (second hole) 62 penetrating along the axial direction, and a plurality of penetrating holes arranged at predetermined intervals in the radially outward direction with the second rod hole 62 as a center. And a hole 64 (see FIGS. 3 and 4). The second rod hole 62 is disposed coaxially with the first rod hole 36 when the holder 20 is attached to the rod cover 14, and the thick shaft portion 58 of the piston rod 18 is movably inserted therein. .

  An annular groove is formed in the second rod hole 62 so as to face the piston rod 18, and a dust removing member 66 is attached to the annular groove. The dust removing member 66 is made of, for example, an annular body made of a fiber material such as polyester, and contains a lubricant.

  The dust removing member 66 is in sliding contact with the outer peripheral surface of the piston rod 18 inserted through the second rod hole 62 and absorbs and removes dust that enters from the outside of the fluid pressure cylinder 10 to the rod cover 14 side. And the function of absorbing and removing the dust generated inside the first and second cylinder chambers 28a, 28b in the cylinder tube 12. For this reason, even if dust existing outside the fluid pressure cylinder 10 adheres to the piston rod 18, it is preferably removed by the dust removing member 66, so that the inside of the cylinder chamber 28 is moved along with the displacement of the piston rod 18. And the dust generated in the cylinder tube 12 is also suitably removed by the dust removing member 66, so that it is not discharged to the outside of the cylinder tube 12.

  The plurality of through holes 64 are provided so as to be spaced apart from each other at equal intervals corresponding to the screw holes 44 formed in the rod cover 14, and bolts 68 are inserted into the through holes 64 and screwed into the screw holes 44. Thus, the holder 20 is fixed to the other end portion side of the rod cover 14. The bolt 68 functions as a fixing unit that fixes the holder 20 to the rod cover 14.

  The fluid pressure cylinder 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described. As shown in FIG. 1, a state where the piston 16 is separated from the rod cover 14 and is displaced toward the closed end portion 12a side (arrow A direction) of the cylinder tube 12 will be described as an initial position.

  By supplying a pressure fluid (for example, compressed air) from a pressure fluid supply source (not shown) to the first port 22, the pressure fluid supplied to the first port 22 passes through the communication path 24 a and the communication chamber 26 to the first cylinder. It is introduced into the chamber 28a. Thereby, the piston 16 provided in the cylinder tube 12 is pressed from the initial position toward the rod cover 14 (in the direction of arrow B), and the piston 16 is displaced toward the rod cover 14. In this case, the pressure fluid in the second cylinder chamber 28b is discharged to the outside from the second port 34 in a state where no pressure fluid is supplied through the communication passage 24b.

  In this case, the piston rod 18 is displaced so that the thick shaft portion 58 is gradually exposed to the outside of the rod cover 14 and protrudes as the piston 16 is displaced, but the outer peripheral surface of the thick shaft portion 58 is dusty. Since it is in contact with the removal member 66, dust or the like generated in the cylinder chamber 28 is preferably absorbed and removed by the dust removal member 66. Therefore, dust and the like generated with the displacement of the piston 16 are prevented from being discharged from the first and second cylinder chambers 28a and 28b to the outside of the cylinder tube 12.

  Then, the buffer member 54b provided on the other end surface of the piston 16 comes into contact with the end surface of the rod cover 14 to be the displacement end position of the piston 16 in the fluid pressure cylinder 10 (see FIG. 5).

  On the other hand, as shown in FIG. 5, when the piston 16 at the above-described displacement end position is displaced in the direction away from the rod cover 14 (arrow A direction), a pressure fluid supply source ( The pressure fluid supplied from (not shown) is supplied to the second port 34 under the switching action of a not-shown switching valve, and the first port 22 is not supplied with the pressure fluid.

  The pressure fluid supplied to the second port 34 is introduced into the second cylinder chamber 28b through the communication passage 24b, and the piston 16 is pressed in a direction away from the rod cover 14, whereby the piston 16 is moved to the rod cover. It is displaced in the direction away from 14 (arrow A direction). In this case, the pressure fluid in the first cylinder chamber 28a is discharged from the first port 22 to the outside through the communication path 24a.

  In this case, the piston rod 18 is displaced so that the thick shaft portion 58 is gradually accommodated in the rod cover 14 with the displacement of the piston 16, but the outer peripheral surface of the thick shaft portion 58 is the dust removing member 66. Therefore, dust and the like adhering to the outer peripheral surface of the piston rod 18 outside the rod cover 14 is suitably absorbed and removed. Therefore, dust in the atmosphere is prevented from entering the cylinder tube 12 together with the piston rod 18.

  Then, the buffer member 54a provided on one end surface of the piston 16 comes into contact with the closed end portion 12a side of the cylinder tube 12 to return to the initial position of the piston 16 in the fluid pressure cylinder 10 (FIG. 1). reference).

  Next, the case where the holder 20 to which the dust removing member 66 is attached will be briefly described with reference to FIGS.

  First, the bolt 68 fixing the holder 20 to the rod cover 14 is screwed and removed, and then the holder 20 is separated from the rod cover 14 along the axial direction of the piston rod 18 (arrow B). Move it in the direction) and remove it.

  Next, when another holder 20 is to be mounted, the piston rod 18 is inserted into the second rod hole 62 formed in the center thereof, and the holder 20 is moved to the rod cover 14 side (arrow A direction). Let Then, the concave portion 60 of the holder 20 is fitted into the convex portion 42 of the rod cover 14, the holder 20 is positioned coaxially with the rod cover 14, and the through hole 64 is formed in the screw hole 44 of the rod cover 14. Then, bolts 68 are inserted into the screw holes 44 through the through holes 64 and screwed together. Thereby, the holder 20 is reliably and simply fixed to the other end of the rod cover 14 (see FIG. 2).

  Thus, since the holder 20 provided with the dust removing member 66 is detachably provided via the plurality of bolts 68 on the other end side of the rod cover 14, the dust 20 can be obtained by replacing the holder 20. The removal member 66 can be replaced easily and regularly. Therefore, when the dust removal performance by the dust removal member 66 is lowered, the dust removal member 66 can be quickly replaced to restore the desired removal performance. At this time, the holder 20 and the rod cover 14 can be easily positioned coaxially by fitting the concave portion 60 of the holder 20 and the convex portion 42 of the rod cover 14. The workability at the time of mounting on the rod cover 14 can be improved.

  In other words, when exchanging the dust removing member 66, the holder 20 including the dust removing member 66 can be exchanged as one unit, and therefore, only the dust removing member 66 is exchanged alone. Compared to the above, the replacement work can be made easier.

  In the above-described embodiment, the case where the bolt 68 is used as the fixing means and the holder 20 is fixed to the rod cover 14 has been described. However, the fixing means is not limited to the bolt 68. Absent. For example, instead of the bolt 68, a retaining ring having a substantially C-shaped cross section and having a resilient force in the radial direction is used, and the retaining ring is engaged between the inner peripheral surface of the holder 20 and the rod cover 14. Accordingly, the holder 20 may be fixed to the rod cover 14.

  As described above, in the present embodiment, the holder 20 is detachably provided on the other end portion side of the rod cover 14, and dust is removed inside the second rod hole 62 that is formed in the rod cover 14 and through which the piston rod 18 is inserted. A member 66 is provided. Then, by bringing the dust removing member 66 into sliding contact with the outer peripheral surface of the piston rod 18, dust or the like in the atmosphere adheres to the outer peripheral surface of the piston rod 18 protruding to the outside of the rod cover 14, and the piston rod 18 is again attached. Even when displaced toward the cylinder tube 12 side (arrow A direction), the dust adhering to the piston rod 18 is suitable by the dust removing member 66 of the holder 20 provided outside the cylinder tube 12 and the rod cover 14. To be absorbed and removed. Therefore, the dust adhering to the piston rod 18 can be suitably prevented from entering the cylinder tube 12.

  Further, dust may be generated in the cylinder chamber 28 as the piston 16 is displaced. Even in such a case, the dust in the cylinder chamber 28 is preferably absorbed and removed by the dust removing member 66 provided in the holder 20. Therefore, dust generated in the fluid pressure cylinder 10 is preferably prevented from being discharged to the outside of the fluid pressure cylinder 10.

  That is, the fluid pressure cylinder 10 does not discharge dust to the outside of the cylinder tube 12, and is therefore suitable for use in an environment where generation of dust is restricted, such as in a clean room.

  Further, since the dust removing member 66 contains a lubricant, the outer peripheral surface of the piston rod 18 that is in sliding contact can always be suitably lubricated, and the bush 38 and the rod packing 40 that are in contact with the piston rod 18 can be provided. And the durability of the bush 38 and the rod packing 40 can be improved.

  Furthermore, since the dust removing member 66 is made of, for example, a fiber material such as polyester and contains a lubricant, the dust removing member 66 adheres to the outer peripheral surface of the piston rod 18 (since dust can be appropriately entangled, Compared with a scraper or the like provided in the fluid pressure cylinder, the dust can be more suitably removed.

  Furthermore, the bush 38, the rod packing 40, and the dust removing member 66 are arranged so as to face the outer peripheral surface of the piston rod 18 so as to be spaced apart from each other by a predetermined distance, and the bush 38, the rod packing 40, and the dust removing are arranged from the piston 16 side. The members 66 are arranged in the order. As a result, the dust removing member 66 disposed at a position farthest from the piston 16 and the cylinder tube 12 suitably prevents the dust from entering the cylinder tube 12 and discharging the dust from the cylinder tube 12. The cylinder rod 28 and the outside are suitably kept airtight by the adjacent rod packing 40, and the outer circumferential surface of the piston rod 18 is covered by the bush 38 in a state where dust is removed from the outside that is disposed closest to the piston 16 side. It can be held freely.

  Further, in the fluid pressure cylinder 10 described above, the case where the single dust removing member 66 is provided in the holder 20 constituting the fluid pressure cylinder 10 has been described. However, the present invention is not limited to this. For example, FIG. A pair of dust removing members 104a and 104b may be provided in parallel on the holder 102 via an annular groove, as in the fluid pressure cylinder 100 shown in FIG. Thereby, compared with the case where the single dust removing member 66 is provided, the discharge of the dust from the fluid pressure cylinder 100 can be more preferably prevented by the pair of dust removing members 104a and 104b, and the cylinder tube. The entry of the dust into the interior of 12 can be more suitably prevented. At the same time, the lubrication performance for the piston rod 18 can be further enhanced, so that the sliding resistance between the bush 38 and the rod packing 40 in contact with the piston rod 18 is reduced, and the bush 38 and the rod packing are reduced. The durability of 40 can be further improved.

  Further, in the above-described fluid pressure cylinders 10 and 100, the cylinder tube 12, the rod cover 14, the piston 16, the piston rod 18, the holders 20 and 102, etc. constituting the fluid pressure cylinders 10 and 100 are formed from a metal material. However, the present invention is not limited to this, and other materials (for example, resin materials) may be selectively applied according to the usage and usage environment of the fluid pressure cylinders 10 and 100. May be.

  Furthermore, in the above-described embodiment, the piston 16 and the piston rod 18 have the first and second ports 22 and 34, and the pressure fluid is alternately supplied to the first and second ports 22 and 34. Although the double-acting fluid pressure cylinders 10 and 100 that can be displaced are described, the present invention is not limited to this. For example, a single port and a spring for biasing the piston are provided, and the piston and the piston rod are displaced under the pressing action of the pressure fluid supplied from the port, and the supply of the pressure fluid is stopped. In this case, the holder 20 having the dust removing member 66 may be detachably provided to the single-acting fluid pressure cylinder capable of displacing the piston in the opposite direction by the spring force of the spring. Good.

  The fluid pressure cylinder according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

1 is an overall longitudinal sectional view of a fluid pressure cylinder according to an embodiment of the present invention. It is an expanded sectional view which shows the rod cover and holder vicinity in the fluid pressure cylinder of FIG. FIG. 3 is an enlarged exploded sectional view showing a state where a holder constituting the fluid pressure cylinder of FIG. 2 is detached from a rod cover. FIG. 2 is a partially omitted exploded perspective view showing a state in which a holder is detached from the fluid pressure cylinder of FIG. 1. FIG. 2 is an overall longitudinal sectional view showing a state in which the piston is displaced to the rod cover side in the fluid pressure cylinder of FIG. 1. It is an expanded sectional view of a fluid pressure cylinder with which a holder concerning a modification is attached.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100 ... Fluid pressure cylinder 12 ... Cylinder tube 14 ... Rod cover 16 ... Piston 18 ... Piston rod 20, 102 ... Holder 22 ... 1st port 28 ... Cylinder chamber 34 ... 2nd port 36 ... 1st rod hole 38 ... Bush 40 ... Rod packing 62 ... Second rod holes 66, 104a, 104b ... Dust removing member

Claims (3)

A cylinder tube having a first port and formed in a cylindrical shape;
A piston that is built in the cylinder tube and that is displaced along the axial direction under the action of a pressure fluid supplied into the cylinder chamber;
A piston rod coupled to the piston;
A cover member that has a first hole through which the piston rod is inserted and a second port that communicates with the first hole, and is attached to an end of the cylinder tube;
A holder provided detachably with respect to the cover member, and having a second hole portion into which the dust rod removing member that is in contact with the outer peripheral surface of the piston rod is mounted,
A packing that is attached to the first hole portion via a first annular groove, contacts the outer peripheral surface of the piston rod, and blocks communication between the cylinder chamber and the outside of the cylinder tube;
With
The dust removing member is formed of a fiber material containing a lubricant, and a concave portion is formed in a substantially central portion of the end surface of the holder. The concave portion is formed with respect to a convex portion formed in a substantially central portion of the cover member. And the dust removing member is mounted in a second annular groove formed on the inner peripheral surface of the second hole, and the second annular groove is substantially in the center along the axial direction of the holder. A fluid pressure cylinder characterized by being arranged in The fluid pressure cylinder according to claim 1, wherein
The fluid pressure cylinder, wherein the holder is fixed to the cover member by a fixing means. The fluid pressure cylinder according to claim 1 or 2,
The first hole includes a guide member that supports an outer peripheral surface of the piston rod so as to be displaceable along the axial direction.
The fluid pressure cylinder, wherein the guide member, the packing, and the dust removing member are arranged in parallel along the axial direction of the piston rod.

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