JP2006349005A - Pressure cylinder equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide pressure cylinder equipment using water or gas as a pressure transmission medium and capable of forming a lubrication film having sufficient thickness continuously by supplying the lubrication film onto a slide-contact face of seal packing to prevent wear of the seal packing securely. <P>SOLUTION: In this pressure cylinder equipment having a cylinder and a piston provided slidably inside the cylinder, provided with the seal packing on an outer peripheral face, and supplying water or gas into a pressure chamber prescribed by the cylinder and the piston or discharging water or gas from the pressure chamber to change internal pressure in the pressure chamber and let the piston slide, lubricating grease held on a piston side are supplied onto the slide-contact face of the seal packing by utilizing changes of internal pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure cylinder device using water or gas as a pressure transmission medium.

Conventionally, oil is generally used as the pressure transmission medium for pressure cylinder equipment, but since oil is difficult to dispose of and the burden on the environment is large, pressure cylinder equipment that uses water in recent years. Development is underway. However, since water has a lower viscosity than oil, the lubricating coating (water coating) formed on the surface of the sliding portion is easily peeled off, and the seal packing provided on the sliding portion wears out, causing water leakage. There is a problem that it is easy to cause. As a countermeasure against such a problem, for example, in Patent Document 1, when a rod portion provided on a piston rod is exposed to the outside of the cylinder, a lubricating coating (water coating) formed on the surface of the rod portion is formed as a through hole of the cylinder. Focusing on the fact that it is peeled off by sliding, a technique has been proposed in which lubricating water supply means for supplying lubricating water to the outer peripheral surface of the rod portion is provided in the through hole portion.
JP 2001-41323 A

  However, since water has low viscosity, it is difficult to ensure a sufficient thickness of the lubricating coating when the contact load applied to the sliding surface is large. Further, when operated for a long time, the sliding portion has heat, so that there is a possibility that water may locally evaporate on the seal surface where the seal packing is in sliding contact, resulting in a dry state. In addition, the pressure cylinder device using gas as a pressure transmission medium has a problem that it tends to be in a dry state due to long-time operation or the like.

  In view of such a situation, the present invention continuously forms a lubricating coating having a sufficient thickness on the sliding surface of the seal packing in a pressure cylinder device using water or gas as a pressure transmission medium. The purpose is to reliably prevent wear.

  The invention according to claim 1 includes a cylinder and a piston that is slidably provided inside the cylinder and includes a seal packing on an outer peripheral surface thereof, and a pressure defined by the cylinder and the piston. In the pressure cylinder device that slides the piston by supplying water or gas to the chamber or discharging water or gas from the pressure chamber to change the internal pressure of the pressure chamber, the change of the internal pressure A pressure cylinder device is provided that supplies lubricating oil and fat held on the piston side to the sliding contact surface of the seal packing. The “water” described in the present claims and claims 2, 9 and 10 includes a mixture of water mixed with a rust inhibitor and other additives in addition to pure water. In addition, the “supplying the lubricating oil to the sliding surface of the seal packing (first seal packing, second seal packing)” described in the present claims and claims 2, 9 and 10 includes: Not only when lubricating oil is supplied directly to the sliding contact surface, but also when the lubricating oil is supplied to the mating surface where the seal packing is in sliding contact and indirectly supplied to the sliding contact surface of the seal packing. Is also included.

  The invention according to claim 2 includes a cylinder, and a piston that is slidably provided inside the cylinder and has a seal packing on an outer peripheral surface thereof. In a pressure cylinder device that introduces water or gas into the pressure chamber or discharges water or gas from the pressure chamber by changing the internal pressure of the pressure chamber defined by the piston, The pressure cylinder device is characterized in that the lubricating oil retained on the piston side is supplied to the sliding contact surface of the seal packing.

  According to a third aspect of the present invention, in the pressure cylinder device according to the first or second aspect, the seal packing and a backup ring provided on an outer peripheral surface of the piston to prevent damage due to deformation of the seal packing. In the meantime, there is provided a pressure cylinder device characterized in that an oil-containing member that holds the lubricating oil / fat inside and releases the retained lubricating oil / fat by a pressure change received from the outside is interposed.

  According to a fourth aspect of the present invention, in the pressure cylinder device according to the first or second aspect, the backup ring that is provided on the outer peripheral surface of the piston and prevents damage due to deformation of the seal packing contains lubricating oil and fat therein. Provided is a pressure cylinder device characterized in that the retained lubricating oil is released by a change in pressure received from outside.

  According to a fifth aspect of the present invention, in the pressure cylinder device according to the first or second aspect, a support ring that is provided integrally with the seal packing and exposed to a sliding contact surface of the seal packing is lubricated therein. Provided is a pressure cylinder device that retains oil and fat and releases the retained lubricating oil and fat by a change in pressure received from the outside.

  The invention according to claim 6 is the pressure cylinder device according to claim 1 or 2, wherein the seal packing holds the lubricating oil and fat inside thereof and releases the lubricating oil and fat held by the pressure change received from the outside. A pressure cylinder device is provided.

  According to a seventh aspect of the present invention, in the pressure cylinder device according to the first or second aspect, an oil chamber is formed in the piston to hold the lubricating oil and fat, and the oil chamber is held by the pressure change of the pressure chamber. There is provided a pressure cylinder device that discharges the lubricating oil and fat to the vicinity of the seal packing.

  The invention according to claim 8 is the pressure cylinder device according to claim 1 or 2, wherein the seal packing is formed in a U-shaped section or a V-shaped section, and a U-shaped or V-shaped recess. A pressure cylinder device is provided in which the lubricating oil and fat is held, and the lubricating oil and fat held in the recess is released by a pressure change in the pressure chamber.

  The invention according to claim 9 is a cylinder, a piston provided slidably inside the cylinder and having a first seal packing on the outer peripheral surface, and a second seal formed on the inner peripheral surface formed on the cylinder. A through-hole provided with a packing, and a piston rod that is provided in the piston and that slides with respect to the through-hole. Water or gas is supplied to a pressure chamber defined by the cylinder and the piston. By supplying or discharging water or gas from the pressure chamber and changing the internal pressure of the pressure chamber, in the pressure cylinder device that slides the piston, utilizing the change of the internal pressure, Supplying the lubricating oil retained on the piston side and / or the cylinder side to the sliding contact surface of the first seal packing and / or the second seal packing. To provide the pressure cylinder equipment and butterflies.

  The invention according to claim 10 is a cylinder, a piston provided slidably inside the cylinder and having a first seal packing on an outer peripheral surface, and a second seal formed on the inner peripheral surface formed on the cylinder. A through-hole provided with a packing, and a piston rod that is provided in the piston and that slides with respect to the through-hole, and is defined by the cylinder and the piston by sliding the piston. In the pressure cylinder device that introduces water or gas into the pressure chamber or discharges water or gas from the pressure chamber by changing the internal pressure of the pressure chamber, utilizing the change in the internal pressure, Supplying the lubricating oil retained on the piston side and / or the cylinder side to the sliding contact surface of the first seal packing and / or the second seal packing To provide a pressure cylinder apparatus according to claim.

  According to the pressure cylinder device of the first or second aspect of the present invention, the following excellent effects can be obtained. Lubricating oil is supplied to the sliding contact surface of the seal packing provided on the piston from the piston side according to the sliding, so that a sufficiently thick lubricating film is maintained between the sliding contact surface of the seal packing and its mating surface. Can be formed. Further, since the lubricating oil is supplied utilizing the change in the internal pressure of the pressure chamber, it is not necessary to provide a special drive source. In addition, although fats and oils are used for formation of a lubricating coating, the amount of use is small compared with the case where oil is used as a pressure transmission medium, and the load on the environment can be reduced.

  According to the pressure cylinder device according to the third aspect of the present invention, in addition to the effect exhibited by the pressure cylinder device according to the first or second aspect, the following excellent effect is achieved. Between the seal packing and the backup ring, an oil-impregnated member that releases lubricating oil and fat in response to pressure changes received from the outside is interposed, so that the seal packing is pressed by the change in the internal pressure of the pressure chamber to release the lubricating oil and fat. Thus, the lubricating oil can be reliably supplied to the sliding contact surface of the seal packing.

  According to the pressure cylinder device according to the fourth aspect of the present invention, in addition to the effect exerted by the pressure cylinder device according to the first or second aspect, the following excellent effect is exhibited. The backup ring provided adjacent to the seal packing holds the lubricating oil and grease. The lubricating oil and grease are released to the sliding contact surface of the seal packing by releasing the lubricating oil and oil by the change in the internal pressure of the pressure chamber. can do.

  According to the pressure cylinder device of the fifth aspect of the present invention, in addition to the effect exhibited by the pressure cylinder device of the first or second aspect, the following excellent effect is achieved. The support ring that is provided integrally with the seal packing and that is exposed to the sliding contact surface holds the lubricating oil and grease. By releasing the lubricating oil and fat due to the change in the internal pressure of the pressure chamber, the support ring is exposed to the sliding contact surface of the seal packing. Thus, the lubricating oil can be reliably supplied.

  According to the pressure cylinder device of the sixth aspect of the present invention, in addition to the effect exhibited by the pressure cylinder device of the first or second aspect, the following excellent effect is achieved. The seal packing itself holds the lubricating oil and fat, and the lubricating oil and fat can be reliably supplied to the sliding contact surface of the seal packing by releasing the lubricating oil and fat by the change in the internal pressure of the pressure chamber.

  According to the pressure cylinder device according to the seventh aspect of the present invention, in addition to the effect exhibited by the pressure cylinder device according to the first or second aspect, the following excellent effect can be achieved. The oil chamber formed in the piston holds the lubricating oil and grease, and the lubricating oil and grease is released from the vicinity of the location where the seal packing is disposed due to the change in the internal pressure of the pressure chamber. Oils and fats can be reliably supplied.

  According to the pressure cylinder device according to the eighth aspect of the present invention, in addition to the effect exhibited by the pressure cylinder device according to the first or second aspect, the following excellent effect is achieved. Lubricating oil is held in the recess of the seal packing formed in a U-shaped section or a V-shaped section, and the lubricating oil is released by a change in the internal pressure of the pressure chamber. Lubricating oil can be reliably supplied.

  The pressure cylinder device according to claim 9 or 10 of the present invention has the following excellent effects. Lubricating oil is supplied to the sliding contact surface of the first seal packing provided in the piston and / or the second seal packing provided in the cylinder from the piston side and / or the cylinder side in accordance with the sliding. A lubricating film having a sufficient thickness can be continuously formed between the sliding surface and the mating surface. Further, since the lubricating oil is supplied utilizing the change in the internal pressure of the pressure chamber, it is not necessary to provide a special drive source. In addition, although fats and oils are used for formation of a lubricating coating, the amount of use is small compared with the case where oil is used as a pressure transmission medium, and the load on the environment can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an example of a pressure cylinder device according to an embodiment of the present invention. 2 to 9 are enlarged sectional views showing the periphery of the sliding contact surface of the seal packing provided in the pressure cylinder device shown in FIG.

[Pressure cylinder equipment to which the present invention is applied]
A pressure cylinder device 1 (FIG. 1) to which the present invention is applied includes a cylinder 2 that forms a cylinder chamber 21 that is filled with water serving as a pressure transmission medium, and a cylinder chamber that is slidably provided inside the cylinder chamber 21. A piston 3 that defines two pressure chambers 211 and 212, and a piston rod 4 that is provided integrally with the piston 3 and is slidably inserted into a through hole 22 that penetrates from the cylinder chamber 21 to the outside. Have. The two pressure chambers 211 and 212 are provided with communication holes 211 a and 212 a for supplying and discharging water, respectively, and these are connected by a communication passage 23. In the middle of the communication path 23, a pump P is connected via a switching valve V. By operating the pump P, water is discharged from one pressure chamber while water is supplied to the other pressure chamber. Be able to.

  One pressure chamber from which water is discharged contracts and the other pressure chamber to which water is supplied expands. Therefore, the piston 3 that partitions both pressure chambers slides inside the cylinder chamber 21. Thereby, the load member W connected with the piston rod 4 outside the cylinder chamber 21 moves in the sliding direction of the piston 3. The switching valve V interposed between the pump P and the communication path 23 is used to switch the connection relationship between the pump P and the communication path 23 to change the direction in which water moves. Therefore, the load member W can be reciprocated by operating the switching valve V when the piston 3 reaches a predetermined position.

  The outer peripheral surface 3a of the piston 3 is slidably contacted with the inner peripheral surface 21a of the cylinder chamber 21 on which the piston 3 slides, and the slidable contact surfaces 51c and 52c prevent water leakage between the two pressure chambers 211 and 212. The piston seal packings 51 and 52 made of resin are provided. The seal packings 51 and 52 are annular bodies provided along the outer peripheral surface 3 a of the piston 3, and are fixed by being fitted into annular grooves 31 and 32 that are recessed in the outer peripheral surface of the piston 3. In the annular grooves 31 and 32, backup rings 61 and 62 for preventing the seal packings 51 and 52 from being deformed by sliding resistance and protruding from the annular grooves 31 and 32, together with the seal packings 51 and 52. It is inset. The backup rings 61 and 62 are metal annular bodies, and a cut is formed at one place in the circumferential direction so that the diameter can be increased when fitted into the annular grooves 31 and 32. In addition, a sliding material 55 is provided on the outer peripheral surface 3 a of the piston 3 to reduce sliding resistance with the inner peripheral surface 21 a of the cylinder chamber 21.

  The inner peripheral surface 22a of the through hole 22 formed through the shaft end wall 24 of the cylinder 2 is in sliding contact with the outer peripheral surface 4a of the piston rod 4 to prevent water leakage from the cylinder chamber 21 to the outside of the cylinder. A resin-made through-hole seal packing 71 having a surface 71c is provided. The seal packing 71 is an annular body provided along the inner peripheral surface 22 a of the through hole 22, and is fixed by being fitted into an annular groove 221 that is recessed in the inner peripheral surface 22 a of the through hole 22. A backup ring 81 is fitted in the annular groove 221 together with the seal packing 71 to prevent damage caused by the seal packing 71 being deformed by sliding resistance or the like and protruding from the annular groove 221. The backup ring 81 is a metal annular body, and a cut is formed at one place in the circumferential direction so that the diameter can be reduced when the backup ring 81 is fitted into the annular groove 221. In addition, a sliding material 72 is provided on the inner peripheral surface 22 a of the through hole 22 to reduce sliding resistance with the outer peripheral surface 4 a of the piston rod 4. In the present invention, by continuously supplying lubricating oil such as lubricating oil or lubricating grease to the sliding contact surfaces 51c, 52c, 71c of the seal packings 51, 52, 71 described above, the seal packings 51, 52, 71 are provided. This prevents sliding wear.

  Hereinafter, in the pressure cylinder device 1 using water as a pressure transmission medium, means for supplying lubricating oil to the sliding contact surface 52c of the seal packing 52 provided on the outer peripheral surface 3a of the piston 3 will be described. In addition, the following means supplies lubricating oil to the sliding contact surface 71c of the seal packing 71 provided on the inner peripheral surface 22a of the through hole 22 as well as supplying the lubricating oil to the sliding contact surface 51c of the seal packing 51. Can also be used in cases.

[Supply of lubricating oil and fat with oil-impregnated members]
2A is an enlarged cross-sectional view showing an embodiment in which lubricating oil is supplied to the sliding surface 52c of the seal packing 52 by an oil-containing member (not shown in FIG. 1) interposed between the seal packing and the backup ring. FIG. The seal packing 52 has a U-shaped cross section, and is provided so that the U-shaped opening 52 a is connected to the pressure chamber 212. The seal packing 52 is also bent in the radial direction by water pressure, and the outer peripheral surface 3 a of the piston 3 and the inner periphery of the cylinder chamber 21. The gap with the surface 21a is sealed. On the back surface 52b side of the surface where the U-shaped opening 52a is formed, a backup ring 62 fitted in the annular groove 32 together with the seal packing 52 is disposed. Between the seal packing 52 and the backup ring 62, an annular oil retaining member 91 fitted in the annular groove 32 is interposed. The oil-impregnated member 91 is a porous body made of an elastic material such as metal or resin, and a large number of holes (not shown) are impregnated (held) with lubricating oil such as oil or grease.

  The oil-impregnated member 91 is elastically deformed when compressed from the outside, and extrudes the lubricating oil impregnated in the pores, and discharges a small part thereof to the outside. Therefore, when water is supplied to the pressure chamber 212 by the pump P and the piston 3 is moved in the left direction in the figure, as shown by an arrow in FIG. Water pressure rise) is transmitted to the oil-impregnated member 91 through the seal packing 52, and the lubricating oil released mainly from the outer peripheral surface 91c by the compressive force thereof is in contact with the inner peripheral surface 21a of the cylinder chamber 21 and the sliding contact surface 52c. To be supplied. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. Although the holes are open to the entire surface of the oil-impregnated member 91, since the seal packing 52 and the backup ring 62 are strongly pressed and adhered to both side surfaces 91a and 91b in the sliding direction, these surfaces 91a. , 91b makes it difficult to release lubricating oil. As a result, the consumption of the impregnated lubricating oil / fat is reduced, and the maintenance interval for exchanging the oil-containing member 91 for replenishment of the lubricating oil / fat can be extended.

  FIG. 2B is an enlarged cross-sectional view showing another embodiment in which lubricating oil is supplied to the sliding contact surface 52c of the seal packing 52 with an oil-containing member interposed between the seal packing and the backup ring. The basic structure is the same as FIG. 2A, but instead of the oil-containing member 91 formed of a porous body, it is formed of a non-porous body made of an elastic material such as metal or resin, and oil is contained inside. An annular oil retaining member 92 having an annular oil chamber 921 filled with lubricating oil such as grease or grease is employed. The oil-impregnated member 92 is formed with a large number of small holes 922 on the outer peripheral surface 92c facing the inner peripheral surface 21a of the cylinder chamber 21 for releasing lubricating oil from the oil chamber 921 that is blocked from the outside. Thereby, the oil-impregnated member 92 is elastically deformed when compressed from the outside, and the lubricating oil filled in the oil chamber 921 is pushed out from the small hole 922, and a part thereof can be discharged to the outside. .

  When water is supplied to the pressure chamber 212 and the piston 3 is moved to the left in the figure, the pressure change (water pressure rise) generated in the pressure chamber 212 is sealed as shown by the arrow in FIG. Lubricating oil transmitted to the oil-impregnated member 92 through the packing 52 and released from the small hole 922 by the compressive force is supplied to the inner peripheral surface 21a of the cylinder chamber 21 and the sliding contact surface 52c slidably in contact therewith. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The small holes 922 for discharging the lubricating oil are formed only on the outer peripheral surface 92c facing the inner peripheral surface 21a of the cylinder chamber 21, so that the lubricating oil is discharged with respect to the inner peripheral surface 21a with which the seal packing 52 slides. Can be supplied efficiently. In addition, since the oil chamber 921 and the small holes 922 that allow accurate dimensional management are used, the amount of retained lubricating oil and the amount of oil discharged are more stable than when using holes that are difficult to control the capacity and number. Maintenance time becomes easier to manage.

  FIG. 3A is an enlarged cross-sectional view showing a modification of the embodiment in which the lubricating oil is supplied to the sliding contact surface 52c of the seal packing 52 with an oil-containing member interposed between the seal packing and the backup ring. FIG. 3B is a view showing the outer peripheral surface 3a of the piston 3 as viewed from the direction of arrow A in FIG. The oil-impregnated member 93 shown in FIG. 3A is an annular grease formed in the circumferential direction along the outer peripheral surface 93c facing the inner peripheral surface 21a with respect to the oil-containing member 91 shown in FIG. The difference is that a holding groove 931 is provided. By providing the grease holding groove 931, the amount of lubricating oil retained can be increased, so that the maintenance interval for replacing the oil retaining member 93 can be made longer. In addition, since the grease retaining groove 931 is formed over the entire circumference of the outer peripheral surface 93c, the grease retaining groove 931 is uniformly distributed on the inner peripheral surface 21a as compared with the case where the lubricating oil is supplied only from the holes that are likely to vary in the arrangement density. Can be supplied. A plurality of grease retaining grooves 931 may be provided at intervals in the sliding direction.

  4 (a) and 4 (c) show another modification of the embodiment in which lubricating oil is supplied to the sliding contact surface 52c of the seal packing 52 with an oil-containing member interposed between the seal packing and the backup ring. It is an expanded sectional view. FIGS. 4B and 4D are views showing the outer peripheral surface 3a of the piston 3 viewed from the direction of arrow A in FIGS. 4A and 4C, respectively. The oil-impregnated member 94 shown in FIGS. 4A and 4C has a predetermined interval in the circumferential direction along the outer peripheral surface 94c facing the inner peripheral surface 21a with respect to the oil-containing member 91 shown in FIG. And a plurality of grease retaining grooves 941 penetrating in the sliding direction. Depending on the setting of the gap dimension, the grease retaining groove 941 can further increase the retention amount of the lubricating oil / fat as compared with the oil-impregnated member 93 in FIG. The interval can be further increased. The oil retaining member 95 shown in FIGS. 4B and 4D does not penetrate the grease retaining groove 951 in the sliding direction with respect to the oil retaining member 94 shown in FIG. Is different. This prevents the grease from flowing out from the grease holding groove 951.

[Lubrication oil supply by backup ring]
FIG. 5A is an enlarged cross-sectional view showing an embodiment in which lubricating oil is supplied to the sliding contact surface 52 c of the seal packing 52 by the backup ring 62 provided on the outer peripheral surface 3 a of the piston 3 together with the seal packing 52. . The seal packing 52 is U-shaped in cross section, and is provided so that the U-shaped opening 52a is connected to the pressure chamber 212. The seal packing 52 is also bent in the radial direction by water pressure, so that the outer peripheral surface 3a and the inner peripheral surface 21a of the piston 3 The gap is sealed. On the back surface 52b side of the surface where the U-shaped opening 52a is formed, a backup ring 62 fitted in the annular groove 32 together with the seal packing 52 is disposed adjacently. The backup ring 62 is a porous body made of an elastic material such as metal or resin, and a large number of holes (not shown) are impregnated (held) with lubricating oil such as oil or grease.

  The backup ring 62 is elastically deformed when compressed from the outside, and pushes out the lubricating oil and fat held in the air holes, thereby releasing a part thereof. Therefore, when water is supplied to the pressure chamber 212 by the pump P (FIG. 1) and the piston 3 is moved in the left direction in the figure, it is generated in the pressure chamber 212 as shown by an arrow in FIG. 5 (a). The pressure change (water pressure rise) is transmitted to the backup ring 62 through the seal packing 52, and the lubricating oil released by the compression force is supplied to the inner peripheral surface 21a of the cylinder chamber 21 and the sliding contact surface 52c slidably in contact therewith. Is done. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. Although the air holes are open to the entire surface of the backup ring 62, the surface 52b of the seal packing 52 and the wall surface 32a of the annular groove 32 are firmly pressed against both side surfaces 62a and 62b in the sliding direction. Therefore, the lubricating oil is difficult to be released from these surfaces 62a and 62b, and the lubricating oil is mainly supplied directly from the outer peripheral surface 62c to the inner peripheral surface 21a. As a result, the consumption amount of the lubricating oil impregnated in the backup ring 62 is reduced, and the maintenance interval for replacing the backup ring 62 for replenishing the lubricating oil can be increased.

  FIG. 5B is an enlarged cross-sectional view showing another embodiment in which lubricating oil is supplied to the sliding contact surface 52c of the seal packing 52 with a backup ring. The basic structure is the same as in FIG. 5A, but instead of the backup ring 62 formed of a porous body, it is formed of a non-porous body made of an elastic material such as metal or resin, and oil is contained inside. A backup ring 63 having an annular oil chamber 631 that holds lubricating oil such as grease or grease is employed. The backup ring 63 is formed with a large number of small holes 632 on the outer peripheral surface 63c facing the inner peripheral surface 21a of the cylinder chamber 21 for releasing lubricating oil from the oil chamber 631 that is blocked from the outside. Thereby, the backup ring 63 is elastically deformed when compressed from the outside, and the lubricating oil filled in the oil chamber 631 can be pushed out from the small hole 632 and a part thereof can be discharged to the outside. .

  When water is supplied to the pressure chamber 212 and the piston 3 is moved to the left in the figure, the pressure change (water pressure rise) generated in the pressure chamber 212 is sealed as shown by the arrow in FIG. The lubricating oil transmitted to the backup ring 63 through the packing 52 and released by the compression force is supplied to the inner peripheral surface 21a of the cylinder chamber 21 and the sliding contact surface 52c slidably contacting the inner peripheral surface 21a. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The small holes 632 for discharging the lubricating oil and fat are formed only on the outer peripheral surface 63c facing the inner peripheral surface 21a of the cylinder chamber 21, so that the lubricating oil and fat are in contact with the inner peripheral surface 21a on which the seal packing 52 slides. Can be supplied efficiently. In addition, since the oil chamber 631 and the small holes 632 capable of accurate dimensional management are used, the amount of lubricant oil retained and released is more stable than when using holes that are difficult to control the capacity and number of Maintenance time becomes easier to manage.

  FIG. 5C is an enlarged cross-sectional view showing a modification of the embodiment in which lubricating oil is supplied to the sliding contact surface 52 c of the seal packing 52 with a backup ring. The backup ring 64 shown in FIG. 5C is an annular grease formed in the circumferential direction along the outer peripheral surface 64c facing the inner peripheral surface 21a with respect to the backup ring 62 shown in FIG. The difference is that a holding groove 641 is provided. By providing the grease holding groove 641, the amount of lubricating oil retained can be increased, so that the maintenance interval for replacing the backup ring 64 for replenishing lubricating oil can be increased. Further, since the grease retaining groove 641 is formed over the entire circumference of the outer peripheral surface 64c, the entire sliding contact surface is evenly distributed as compared with the case where the lubricating oil is supplied only from the holes that are likely to vary in the arrangement density. Can be lubricated. A plurality of grease holding grooves 641 may be provided at intervals in the sliding direction.

  FIG. 5D is an enlarged cross-sectional view showing another modification of the embodiment in which lubricating oil is supplied to the sliding contact surface 52 c of the seal packing 52 with a backup ring. The backup ring 65 shown in FIG. 5 (d) is formed at predetermined intervals in the circumferential direction along the outer peripheral surface 65c facing the inner peripheral surface 21a with respect to the backup ring 62 shown in FIG. 5 (a). The difference is that a plurality of grease retaining grooves 651 penetrating in the sliding direction are provided. Depending on the setting of the gap dimension, the grease holding groove 651 can further increase the amount of the lubricating oil retained as compared with the backup ring 64 of FIG. 5C, and further increase the maintenance interval for replacing the backup ring 65. Can do. In addition, you may make it close one end like the grease holding groove with which the oil retaining member of FIG.4 (c) is equipped, without letting the grease holding groove 651 penetrate in a sliding direction. Thereby, it is possible to prevent the grease from flowing out from the grease holding groove 651.

[Supplying lubricating oil with support ring]
FIG. 6A shows an embodiment in which lubricating oil is supplied to the sliding contact surface 52c of the seal packing 52 by an annular support ring 521 that is provided integrally with the seal packing 52 and exposed to the sliding contact surface 52c. FIG. The seal packing 52 having a U-shaped cross section is provided so that the U-shaped opening 52a is connected to the pressure chamber 212. The U-shaped opening 52a is also bent in the radial direction by water pressure, and is formed between the outer peripheral surface 3a and the inner peripheral surface 21a of the piston 3. The gap is sealed. The support ring 521 is provided so as to be fitted into a recess 52e extending in the sliding direction from the back surface 52b side of the surface where the U-shaped opening 52a is formed. The support ring 521 is a porous body made of an elastic material such as metal or resin, and a large number of holes (not shown) are impregnated (held) with lubricating oil such as oil or grease.

  The support ring 521 is elastically deformed when compressed from the outside, and extrudes the lubricating oil retained in the air holes, and releases a part thereof. When water is supplied to the pressure chamber 212 by the pump P (FIG. 1) and the piston 3 is moved, as shown by an arrow in FIG. 6 (a), a pressure change (water pressure increase) generated in the pressure chamber 212 occurs. Lubricating oil transmitted to the support ring 521 through the seal packing 52 and released by the compression force is supplied to the inner peripheral surface 21a of the cylinder chamber 21 and the sliding contact surface 52c slidably contacting the inner peripheral surface 21a. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The air holes are provided so as to open to the entire surface of the support ring 521. On both side surfaces 521a, 521b and the inner peripheral surface 521d in the sliding direction, the recess 52e and the backup ring 62 of the seal packing 52 are provided. Since it is pressed strongly and comes into close contact, lubricating oils and fats are hardly released from these surfaces. As a result, the consumption of the impregnated lubricating oil and fat is reduced, and the maintenance interval for replacing the support ring 521 for replenishing the lubricating oil and fat can be lengthened.

  FIG. 6B is an enlarged cross-sectional view showing another embodiment in which lubricating oil is supplied to the sliding contact surface 52 c of the seal packing 52 with a support ring. The basic structure is the same as FIG. 6A, but instead of the support ring 521 formed of a porous body, it is formed of a non-porous body made of an elastic material such as metal or resin, and oil is contained inside. A support ring 522 having an annular oil chamber 522a for holding lubricating oil such as grease or grease is employed. The support ring 522 is formed with a plurality of small holes 522b on the outer peripheral surface 552c facing the inner peripheral surface 21a of the cylinder chamber 21 for releasing lubricating oil from the oil chamber 522a that is blocked from the outside. Thereby, the support ring 522 is elastically deformed when compressed from the outside, and the lubricating oil filled in the oil chamber 631 can be pushed out from the small hole 632 and a part thereof can be discharged to the outside. .

  When water is supplied to the pressure chamber 212 by the pump P and the piston 3 is moved, the pressure change (water pressure rise) generated in the pressure chamber 212 causes the seal packing 52 to move as shown by the arrow in FIG. The lubricating oil that is transmitted to the support ring 522 and released by the compressive force is supplied to the inner peripheral surface 21a of the cylinder chamber 21 and the sliding contact surface 52c that is in sliding contact therewith. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The small holes 522b for releasing the lubricating oil and fat are formed only on the outer peripheral surface 522c facing the inner peripheral surface 21a of the cylinder chamber 21, so that the lubricating oil and fat are in contact with the inner peripheral surface 21a on which the seal packing 52 slides. Can be supplied efficiently. In addition, since the oil chamber 522a and the small holes 522b capable of accurate dimensional control are used, the amount of retained lubricating oil and the amount released are more stable than when using holes that are difficult to control the capacity and number. Maintenance time becomes easier to manage.

  FIG. 6C is an enlarged cross-sectional view showing a modification of the embodiment in which lubricating oil is supplied by a support ring to the sliding contact surface 52 c of the seal packing 52. The support ring 523 shown in FIG. 6C is an annular grease formed in the circumferential direction along the outer peripheral surface 523c facing the inner peripheral surface 21a with respect to the support ring 521 shown in FIG. The difference is that a holding groove 523f is provided. By providing the grease holding groove 523f, the amount of lubricating oil retained can be increased, so that the maintenance interval for replacing the support ring 523 can be made longer. In addition, since the grease retaining groove 523f is formed over the entire circumference of the outer peripheral surface 523c, the sliding contact surface is arranged on the entire circumference as compared with the case where the lubricating oil is supplied only from the holes that are likely to vary in the arrangement density. It is possible to lubricate evenly over the entire area. A plurality of grease retaining grooves 523f may be provided at intervals in the sliding direction.

  FIG. 6D is an enlarged cross-sectional view showing another modification of the embodiment in which the lubricating oil is supplied by the support ring to the sliding contact surface 52 c of the seal packing 52. The support ring 524 shown in FIG. 6 (d) is formed at predetermined intervals in the circumferential direction along the outer peripheral surface 524c facing the inner peripheral surface 21a with respect to the support ring 521 shown in FIG. 6 (a). The difference is that a plurality of grease retaining grooves 524f penetrating in the sliding direction are provided. Depending on the setting of the interval dimension, the amount of lubricating oil retained can be increased more than the support ring 523 of FIG. 6C, and the maintenance interval for replacing the port ring 523 can be further increased. The grease holding groove 524f may be closed at one end, similarly to the grease holding groove provided in the oil-impregnated member of FIG. 4C, without penetrating in the sliding direction. This prevents the grease from flowing out from the grease holding groove 524f.

[Supply of lubricating oil with seal packing]
FIG. 7A is an enlarged cross-sectional view showing an embodiment in which lubricating oil is supplied to the sliding contact surface 52c of the seal packing 52 by the seal packing 52 itself. The seal packing 52 has a U-shaped cross section, and is provided so that the U-shaped opening 52a faces the pressure chamber 212. The seal packing 52 is also bent in the radial direction by water pressure, and the outer peripheral surface 3a and the inner peripheral surface 21a of the piston 3 The gap is sealed. On the back surface 52b side of the surface where the U-shaped opening 52a is formed, a backup ring 62 fitted in the annular groove 32 together with the seal packing 52 is disposed. The seal packing 52 is a porous body made of an elastic resin material, and a large number of holes (not shown) are impregnated (held) with lubricating oil such as oil or grease.

  The seal packing 52 is elastically deformed when compressed from the outside, and extrudes the lubricating oil retained in the air holes, and releases a part thereof. Therefore, when water is supplied to the pressure chamber 212 by the pump P (FIG. 1) and the piston 3 is moved in the left direction in the figure, it is generated in the pressure chamber 212 as shown by an arrow in FIG. 7 (a). Lubricating oil released by the pressure change (water pressure rise) is directly supplied to the sliding contact surface 52c and the inner peripheral surface 21a of the cylinder chamber 21 slidingly contacting the sliding contact surface 52c, and sliding lubrication of both is performed reliably. In addition, you may make it perform the process which closes a void | hole so that lubricating oil may not melt | dissolve in the water in the pressure chamber 212 from the surface in which the U-shaped opening 52a is formed.

  FIG.7 (b) is an expanded sectional view which shows the modification of embodiment which supplies lubricating oil with a seal packing. The seal packing 53 shown in FIG. 7B has three annular grease retaining grooves 531 formed in the circumferential direction along the sliding contact surface 53c with respect to the seal packing 52 shown in FIG. The difference is that (multiple). By providing the grease holding groove 531, the amount of lubricating oil retained can be increased, so that the maintenance interval for replacing the seal packing for replenishing the lubricating oil can be further increased. In addition, since the grease retaining groove 531 is formed over the entire circumference of the sliding contact surface 53c, the entire surface of the sliding contact surface can be compared with the case where the lubricating oil is supplied only from the holes where the arrangement density tends to vary. It can be supplied evenly over the circumference. The grease holding groove 531 may be only one instead of a plurality.

  FIG.7 (c) is an expanded sectional view which shows another modification of embodiment which supplies lubricating oil with a seal packing. The seal packing 54 shown in FIG. 7C is formed at a predetermined interval in the circumferential direction along the sliding contact surface 54c with respect to the seal packing 52 shown in FIG. 7A, and extends in the sliding direction. The difference is that the grease retaining grooves 541 are provided. Depending on the setting of the gap dimension, the grease holding groove 541 can further increase the amount of lubricating oil retained as compared with the seal packing 53 of FIG. 7B, and maintenance for replacing the seal packing 53 to replenish the lubricating oil. The interval can be further increased.

[Supply of lubricating oil and fat by the oil chamber formed in the piston]
FIG. 8A is an enlarged cross-sectional view showing an embodiment in which lubricating oil is supplied from the oil chamber 33 formed in the piston 3 to the sliding contact surface 52 c of the seal packing 52. The seal packing 52 has a U-shaped cross section, and is provided so that the U-shaped opening 52a faces the pressure chamber 212. The seal packing 52 is also bent in the radial direction by water pressure, and the outer peripheral surface 3a and the inner peripheral surface 21a of the piston 3 The gap is sealed. The oil chamber 33 is filled with lubricating oil and has a small hole 331 that penetrates to the outer peripheral surface 3 a of the piston 3. The small hole 331 is formed to release the lubricating oil retained in the oil chamber 33 little by little and opens to the pressure chamber 212 side. When water is sucked and discharged from the pressure chamber 212 by the pump P (FIG. 1) and the piston 3 is moved in the right direction in the figure, the pressure change (negative pressure generation) generated in the pressure chamber 212 causes the inside of the oil chamber 33 Thus, the lubricating oil / fat is supplied to the pressure chamber 212 side, whereby the lubricating oil / fat is supplied to the inner peripheral surface 21a and the sliding contact surface 52c of the seal packing 52 that comes into sliding contact therewith. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The oil chamber 33 has a larger amount of lubricating oil that can be retained than the oil chamber provided in the backup ring, the support ring, etc. described above, so that the maintenance interval for replenishing the lubricating oil can be extended.

  FIG. 8B is an enlarged cross-sectional view showing a modification of the embodiment in which lubricating oil is supplied from the oil chamber formed in the piston 3. The oil chamber 34 shown in FIG. 8 (b) is formed with an opening 34a that opens greatly in the outer peripheral surface 3a of the piston 3, and a felt 341 is fitted into the opening 34a. When water is sucked and discharged from the pressure chamber 212 and the piston 3 is moved in the right direction in the figure, the lubricating oil in the oil chamber 34 is moved to the felt 341 side by the pressure change (negative pressure generation) generated in the pressure chamber 212. Thus, the lubricating oil is supplied to the inner peripheral surface 21a and the sliding contact surface 52c of the seal packing 52 that is in sliding contact with the inner peripheral surface 21a. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The felt 341 is dimensioned so as to be in sliding contact with the inner peripheral surface 21a of the cylinder chamber 21, and the lubricating oil discharged from the oil chamber 34 can be efficiently supplied so as to be applied directly to the inner peripheral surface 21a. .

  FIG. 8C is an enlarged cross-sectional view showing another modified example of the embodiment in which the lubricating oil is supplied from the oil chamber formed in the piston 3. The oil chamber 35 shown in FIG. 8 (c) is formed with an opening 35a that opens greatly on the outer peripheral surface 3a of the piston 3, and an oil-containing member 351 made of a porous material is fitted therein. When water is sucked and discharged from the pressure chamber 212 and the piston 3 is moved in the right direction in the figure, the lubricating oil and fat in the oil chamber 35 is changed by the pressure change (negative pressure generation) generated in the pressure chamber 212. As a result, the lubricating oil is supplied to the inner peripheral surface 21a and the sliding contact surface 52c of the seal packing 52 that is in sliding contact with the inner peripheral surface 21a. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The oil-containing member 351 is dimensioned so as to be in sliding contact with the inner peripheral surface 21a of the cylinder chamber 21, and the lubricating oil discharged from the oil chamber 35 can be efficiently supplied so as to be applied directly to the inner peripheral surface 21a. it can. Solid lubricating grease is employed so that the lubricating oil retained in the oil chamber 35 does not leak from the gap between the oil-containing member 351 and the opening 35 a of the oil chamber 35.

[Supply of lubricating oil with U-shaped cross section seal packing]
FIG. 9 is an enlarged cross-sectional view showing an embodiment in which the lubricating oil retained by the seal packing 52 is supplied to the sliding contact surface 52 c of the seal packing 52. The seal packing 52 is U-shaped in cross section, and is provided so that the U-shaped opening 52a is connected to the pressure chamber 212. The seal packing 52 is also bent in the radial direction by water pressure, so that the outer peripheral surface 3a and the inner peripheral surface 21a of the piston 3 The gap is sealed. The U-shaped opening 52a is filled with lubricating grease. Since the U-shaped opening 52a is covered to some extent by the annular groove 32 into which the seal packing 52 is fitted, it does not easily flow out into the pressure chamber 212. When the piston 3 is moved to the right in the drawing by sucking and discharging water from the pressure chamber 212 with the pump P (FIG. 1), the pressure change (negative pressure generation) generated in the pressure chamber 212 causes a change in FIG. As indicated by the arrows, the lubricating oil in the U-shaped opening 52a is sucked out to the pressure chamber 212 side, whereby the inner peripheral surface 21a that is in sliding contact with the seal packing 52 and the sliding contact surface 52c that is in sliding contact with the inner surface 21a. Supply lubricating oil. In particular, since the lubricating oil is supplied immediately before the seal packing in the traveling direction on the inner peripheral surface 21a, the sliding contact surface 52c is reliably lubricated. The seal packing may be an annular body having a V-shaped cross section with a V-shaped opening.

[Modification of the above embodiment]
In the said embodiment, although water was used as a pressure transmission medium of the pressure cylinder apparatus 1, you may use the mixture of water by which the antirust agent and other additives were mixed with water. A gas such as air may be used as the pressure transmission medium.

  The pressure cylinder device 1 of the above embodiment is configured to slide the piston 3 by supplying water to the pressure chamber 212 in the cylinder by the pump P or by sucking and discharging water from the pressure chamber 212. Using the change in the internal pressure of the pressure chamber 212 generated when water is supplied or discharged by P, lubricating oil is supplied to the inner peripheral surface 21a and the sliding contact surface of the seal packing that is in sliding contact with the inner peripheral surface 21a. However, the present invention is not limited to this. For example, in the present invention, instead of the load member W, a drive source is connected to the piston rod 4 to slide the piston, and water is introduced into the pressure chamber, or water is supplied from the pressure chamber. It may be applied to a pressure cylinder device that discharges gas. That is, lubricating oil and fat may be supplied to the sliding contact surface of the seal packing by utilizing a change in internal pressure that occurs when water is introduced into or discharged from the pressure chamber by external power. good.

  In the above embodiment, the means for supplying the lubricating oil to the sliding contact surface 52c of the seal packing 52 provided on the outer peripheral surface 3a of the piston 3 has been described, but the sliding contact surface 51a of the seal packing 51 has the same configuration as described above. It is also possible to supply lubricating oil. In addition, the supply means of the lubricating oil described above does not have to be employed independently, and may be employed in combination. For example, an oil-containing member and a seal packing impregnated with lubricating oil may be used in combination.

  Also, the lubricating oil can be supplied to the sliding contact surface 71c of the seal packing 71 provided on the inner peripheral surface 22a of the through hole 22 as in the above embodiment. Specifically, an annular oil retaining member for retaining lubricating oil / fat is interposed between the seal packing 71 fitted in the annular groove 221 of the through hole 22 and the backup ring 81, and the sealing packing for retaining the lubricating oil / fat on the backup ring 81. The support ring provided so as to be exposed to the slidable contact surface 71c of 71 is made to hold the lubricating oil and fat, and the seal packing 71 itself is made to hold the lubricating oil and fat. An oil chamber is provided on the side of 211 to supply the lubricating oil and oil held therein. The seal packing 71 is U-shaped in cross section so that the U-shaped opening is connected to the pressure chamber 211, and the U-shaped opening is lubricated. For example, keep grease. Then, by utilizing the change in the internal pressure of the pressure chamber 211 when the piston 3 slides, the retained lubricating oil can be pushed out or sucked out and supplied to the sliding contact surface 7c.

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

Sectional drawing which shows an example of the pressure cylinder apparatus which is embodiment of this invention. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. 1, showing a means for supplying lubricating oil and fat with an oil-containing member to a sliding contact surface of a seal packing. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. It is a partial enlarged view of the pressure cylinder apparatus shown in FIG. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. 1, showing a means for supplying lubricating oil with a backup ring to a sliding contact surface of a seal packing. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. 1, showing a means for supplying lubricating oil to the sliding contact surface of the seal packing with a support ring. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. 1, showing a means for supplying lubricating oil to the sliding contact surface of the seal packing with the seal packing. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. 1, showing a means for supplying lubricating oil from an oil chamber formed in a piston on a sliding surface of a seal packing. FIG. 2 is a partially enlarged view of the pressure cylinder device shown in FIG. 1, showing a means for supplying lubricating oil held by the seal packing to the sliding surface of the seal packing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure cylinder apparatus 2 Cylinder 3 Piston 4 Piston rod 51 Seal packing 52 Seal packing 211 Pressure chamber 212 Pressure chamber

Claims (10)

A cylinder, and a piston slidably provided inside the cylinder and provided with a seal packing on the outer peripheral surface,
Water or gas is supplied to a pressure chamber defined by the cylinder and the piston, or water or gas is discharged from the pressure chamber to change the internal pressure of the pressure chamber, thereby sliding the piston. In pressure cylinder equipment,
A pressure cylinder device characterized in that the lubricating oil retained on the piston side is supplied to the sliding contact surface of the seal packing by utilizing the change in the internal pressure. A cylinder, and a piston slidably provided inside the cylinder and provided with a seal packing on the outer peripheral surface,
By sliding the piston and changing the internal pressure of the pressure chamber defined by the cylinder and the piston, water or gas is introduced into the pressure chamber, or water or gas is discharged from the pressure chamber. In pressure cylinder equipment,
A pressure cylinder device characterized in that the lubricating oil retained on the piston side is supplied to the sliding contact surface of the seal packing by utilizing the change in the internal pressure. The pressure cylinder device according to claim 1 or 2,
Between the seal packing and a backup ring that is provided on the outer peripheral surface of the piston and prevents damage due to deformation of the seal packing, the lubricating oil is retained by a pressure change that is retained inside and received from the outside. A pressure cylinder device characterized by interposing an oil-impregnated member that releases oil. The pressure cylinder device according to claim 1 or 2,
A backup ring provided on the outer peripheral surface of the piston for preventing damage due to deformation of the seal packing holds the lubricating oil and fat therein and releases the retained lubricating oil and fat by a pressure change received from the outside. To pressure cylinder equipment. The pressure cylinder device according to claim 1 or 2,
A support ring that is provided integrally with the seal packing and exposed to the sliding contact surface of the seal packing holds the lubricating oil and fat therein, and releases the retained lubricating oil and fat by a pressure change received from the outside. Features pressure cylinder equipment. The pressure cylinder device according to claim 1 or 2,
A pressure cylinder device, wherein the seal packing retains lubricating oil and fat therein and releases the retained lubricating oil and fat according to a change in pressure received from the outside. The pressure cylinder device according to claim 1 or 2,
An oil chamber is formed in the piston to hold the lubricating oil and fat, and the lubricating oil and fat held in the oil chamber is released in the vicinity of the seal packing by a change in pressure in the pressure chamber. . The pressure cylinder device according to claim 1 or 2,
The seal packing is formed in a U-shaped cross section or a V-shaped cross section, and lubricating oil is held in the U-shaped or V-shaped recess, and is held in the recess due to a pressure change in the pressure chamber. Pressure cylinder equipment characterized by releasing lubricating oil. A cylinder, a piston slidably provided inside the cylinder and provided with a first seal packing on the outer peripheral surface, a through hole formed in the cylinder and provided with a second seal packing on the inner peripheral surface, and the piston And a piston rod that passes through the through hole and slides therethrough,
Water or gas is supplied to a pressure chamber defined by the cylinder and the piston, or water or gas is discharged from the pressure chamber to change the internal pressure of the pressure chamber, thereby sliding the piston. In pressure cylinder equipment,
Utilizing the change in the internal pressure, the lubricating oil retained on the piston side and / or the cylinder side is supplied to the sliding contact surface of the first seal packing and / or the second seal packing. Features pressure cylinder equipment. A cylinder, a piston slidably provided inside the cylinder and provided with a first seal packing on the outer peripheral surface; a through hole formed in the cylinder and provided with a second seal packing on the inner peripheral surface; and the piston And a piston rod that passes through the through hole and slides therethrough,
By sliding the piston and changing the internal pressure of the pressure chamber defined by the cylinder and the piston, water or gas is introduced into the pressure chamber or water or gas is discharged from the pressure chamber. In pressure cylinder equipment,
Utilizing the change in the internal pressure, the lubricating oil retained on the piston side and / or the cylinder side is supplied to the sliding contact surface of the first seal packing and / or the second seal packing. Features pressure cylinder equipment.

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