WO2015159444A1 - Fluid pressure cylinder - Google Patents

Fluid pressure cylinder Download PDF

Info

Publication number
WO2015159444A1
WO2015159444A1 PCT/JP2014/066797 JP2014066797W WO2015159444A1 WO 2015159444 A1 WO2015159444 A1 WO 2015159444A1 JP 2014066797 W JP2014066797 W JP 2014066797W WO 2015159444 A1 WO2015159444 A1 WO 2015159444A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod
piston
cushion
cylinder
fluid pressure
Prior art date
Application number
PCT/JP2014/066797
Other languages
French (fr)
Japanese (ja)
Inventor
門田謙吾
Original Assignee
Smc株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2014001930 priority Critical patent/JP3191509U/en
Priority to JP2014-001930U priority
Application filed by Smc株式会社 filed Critical Smc株式会社
Publication of WO2015159444A1 publication Critical patent/WO2015159444A1/en

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20Other details, e.g. assembly with regulating devices
    • F15B15/22Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details
    • F15B15/1433End caps

Abstract

This concept pertains to a fluid pressure cylinder (10) which has a head cover (14) and a rod cover (16) provided on both ends of a cylinder tube (12), wherein the head cover (14) and the rod cover (16) are formed by casting such as die-casting. A first connecting channel (34) which recesses in a groove shape in the outward radial direction is formed in the outer-circumferential surface of a first concave section (28) of the head cover (14). A ring-shaped first holder (32) is pressed into the first concave section (28), causing the formation of a cross-sectionally rectangular first connecting channel (34), the opening region of which is sealed. In addition, the first connecting channel (34) connects a cylinder chamber (20) of the cylinder tube (12) and a first cushion chamber (30) of the head cover (14).

Description

Fluid pressure cylinder

The present invention relates to a fluid pressure cylinder for axially displacing a piston under supply action of pressure fluid, and more particularly, a fluid pressure cylinder having a cushion mechanism capable of absorbing an impact at a displacement end position of the piston. About.

2. Description of the Related Art Conventionally, a fluid pressure cylinder having a piston that is displaced under the action of supplying a pressure fluid, for example, is used as a transport means for a work or the like. The applicant has proposed a fluid pressure cylinder provided with a cushion mechanism capable of cushioning an impact at a displacement end position of a piston as disclosed in Japanese Patent Laid-Open No. 2008-133920.

The fluid pressure cylinder having this cushioning mechanism is provided with hollow cylindrical cushion rings on both end faces of the piston, and when the piston is displaced along the cylinder tube, the cushion ring is a recess in the head cover or a recess in the rod cover By inserting the valve, the flow rate of the fluid discharged from the port to the outside is reduced to reduce the displacement speed of the piston.

In recent years, it has been desired to further reduce the manufacturing cost of the fluid pressure cylinder as described above.

A general object of the present invention is to provide a fluid pressure cylinder capable of reducing the manufacturing cost as well as shortening the manufacturing process.

The present invention comprises a cylinder tube having a cylinder chamber closed by a pair of cover members, a piston internally mounted on the cylinder tube and displaced along the axial direction in the cylinder chamber, a pressure member formed on the cover member A fluid pressure cylinder having a port to be discharged and a rod mounted at an end along the axial direction of the piston and provided so as to be displaceable with the piston.
The cover member is formed by casting and has a receiving hole in which a rod displaced with the piston is received, and the receiving hole is formed with a groove recessed with respect to the inner wall, and a ring-shaped holder into which the rod is inserted The groove is closed along the extending direction by being attached to the housing hole, to form a passage connecting the cylinder chamber and the port, and the holder is formed with the insertion hole through which the rod is inserted. The hole is provided with a seal member which is in sliding contact with the outer peripheral surface of the rod.

According to the present invention, in a fluid pressure cylinder having a piston displaceable along a cylinder tube and having a rod at the end along the axial direction of the piston, a cover member provided at the end of the cylinder tube Is formed by casting and has a receiving hole for receiving a rod displaced with the piston, and the receiving hole is formed with a groove recessed with respect to the inner wall surface, and the rod is inserted into the ring shape By mounting the holder in the housing hole, the groove is closed along the extending direction, and a passage for communicating the cylinder chamber with the port is configured. Further, an insertion hole through which the rod is inserted is formed in the holder, and the seal member provided in the insertion hole is brought into sliding contact with the outer peripheral surface of the rod.

Therefore, when the cover member is manufactured by casting, the groove portion is simultaneously formed, and by mounting the holder in the storage hole, the opening portion along the extending direction of the groove portion can be closed to be a passage. As compared with the case where the passage is formed by processing after manufacturing, the passage can be easily formed, and accordingly, the manufacturing process can be shortened and the manufacturing cost can be reduced.

The above object, features and advantages will be easily understood from the following description of the embodiment described with reference to the attached drawings.

FIG. 1 is an overall cross-sectional view of a fluid pressure cylinder according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view showing the vicinity of a head cover in the fluid pressure cylinder of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is an exploded perspective view of the head cover. FIG. 5 is an enlarged sectional view showing the vicinity of a rod cover in the fluid pressure cylinder of FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. FIG. 7 is an exploded perspective view of the rod cover. FIG. 8 is an overall sectional view showing a state in which the piston has moved to the rod cover side in the fluid pressure cylinder of FIG.

The fluid pressure cylinder 10 comprises a cylindrical cylinder tube 12, a head cover (cover member) 14 attached to one end of the cylinder tube 12, and the cylinder tube 12 as shown in FIGS. 1 to 8. It includes a rod cover (cover member) 16 attached to the other end, and a piston 18 provided displaceably inside the cylinder tube 12.

The cylinder tube 12 is, for example, a cylindrical body extending at a substantially constant diameter along the axial direction (the directions of arrows A and B), and a piston 18 is accommodated therein and closed by the head cover 14 and the rod cover 16 A cylinder chamber 20 is formed.

The head cover 14 is formed, for example, by casting such as die-casting from a metal material such as aluminum alloy, and as shown in FIG. 3, at four corners formed in a rectangular shape in the axial direction (arrows A and B). A first through hole 22 is formed along and along. Further, as shown in FIGS. 1 and 2, the head cover 14 is formed with a first stepped portion 24 which protrudes by a predetermined length from an end facing the rod cover 16 side (the direction of arrow A). One end of the cylinder tube 12 is held by being inserted into the side. A gasket 25 is provided between the first stepped portion 24 and the cylinder tube 12 to prevent leakage of the pressure fluid.

A first port 26 extending in a direction perpendicular to the axis of the head cover 14 is formed on the outside of the head cover 14, and pressure fluid is supplied to and discharged from the first port 26 through a pipe (not shown). Ru.

On the other hand, a first concave portion (housing hole) 28 having a circular cross section is formed with a predetermined depth so as to reach the cylinder tube 12 side (arrow A direction) at a central portion of the head cover 14. A first cushion chamber 30 in communication with the chamber is formed. The first cushion chamber 30 is formed at a position on the inner peripheral side of the first stepped portion 24.

A ring-shaped first holder 32 is press-fitted and fixed to the first recess 28, and a first communication passage (passage) 34 recessed radially outward from the inner circumferential surface is formed.

As shown in FIG. 3 and FIG. 4, the first communication passage 34 is formed, for example, in a rectangular shape in cross section, and provided at a position in the first recess 28 substantially in the same direction as the opening direction of the first port 26.

The first communication passage 34 includes a horizontal portion (first passage portion) 36 a extending in the same cross section along the axial direction (arrows A and B directions) from the opening of the first recess 28, and the first communication passage 34. It comprises a vertical portion (second passage portion) 38 a extending in the vertical direction (the direction of arrow C) from the end toward the center side of the first recess 28.

That is, the horizontal portion 36a communicates with the cylinder chamber 20 by opening to the cylinder chamber 20 side (the direction of the arrow A), and the lower end portion of the vertical portion 38a communicates with the first cushion chamber 30 described later. The cylinder chamber 20 of the cylinder tube 12 and the first cushion chamber 30 communicate with each other through the first communication passage 34.

In this case, both the horizontal portion 36a and the vertical portion 38a are formed in a rectangular shape in cross section, but not limited to the rectangular shape in cross section, and may be formed in a semicircular shape in cross section.

The first communication passage 34 is simultaneously formed when the head cover 14 is manufactured by casting, and is not formed by another process such as cutting after the head cover 14 is formed by casting.

The first cushion chamber 30 is, for example, a space which is formed to be smaller in diameter and coaxial with the first recess 28 and closed by an end of the head cover 14. The first cushion chamber 30 communicates with the first port 26 provided on the outer peripheral side, and also communicates with the cylinder chamber 20 through the first communication passage 34.

The first holder 32 is formed of an annular body having a first cushion hole (insertion hole) 40 at its center, and the outer peripheral surface of the first holder 32 is pressed by being pressed into the first recess 28. The first recess 28 is fitted and fixed to the inner circumferential surface of the first recess 28. Further, the end surface of the first holder 32 is fixed so as to abut on the wall surface of the first recess 28.

By thus mounting the first holder 32 in the first recess 28, the inner peripheral side of the horizontal portion 36 a in the first communication passage 34 and the cylinder tube 12 side of the vertical portion 38 a respectively have the outer peripheral surface of the first holder 32. The end face is covered by the end face to form a passage of rectangular cross-section through which the pressure fluid flows.

In other words, when the first holder 32 is not attached, the first communication passage 34 is in the open state on the inner peripheral side of the head cover 14 and on the cylinder tube 12 side. A passage having a rectangular cross section in which each of the 12 sides is covered is configured.

Further, the first cushion packing (seal member) 42 is attached to the first cushion hole 40 via an annular groove formed in the inner peripheral surface thereof. The first cushion packing 42 is annularly formed of, for example, an elastic material such as rubber, and is provided so as to protrude to the inner peripheral side with respect to the inner peripheral surface of the first cushion hole 40. Then, when a first cushion rod (rod) 78 described later is inserted into the first cushion hole 40, the outer peripheral surface of the first cushion rod 78 is in sliding contact with the first cushion packing 42.

As shown in FIGS. 1 and 5 to 7, the rod cover 16 is formed, for example, by casting such as die casting from a metal material such as an aluminum alloy as in the head cover 14, and is formed in a rectangular shape in cross section. Second through holes 44 are formed at the four corners along the axial direction (arrows A and B) (see FIGS. 6 and 7). Further, the rod cover 16 is formed with a second stepped portion 46 which protrudes by a predetermined length from an end facing the head cover 14 side (arrow B direction), and the other end of the cylinder tube 12 is inserted on the outer peripheral side It is held by being done. A gasket 25 is provided on the outer peripheral side of the second stepped portion 46 between the second stepped portion 46 and the cylinder tube 12 to prevent leakage of the pressure fluid.

Then, with the one end of the cylinder tube 12 being inserted into the first stepped portion 24 of the head cover 14 and the other end being inserted into the second stepped portion 46 of the rod cover 16, the plurality of first and second The connecting rod 48 is inserted through the through holes 22 and 44, and a nut (not shown) is screwed on and tightened at both ends thereof. Thus, the head cover 14, the rod cover 16 and the cylinder tube 12 are integrally fixed in a state where the cylinder tube 12 is held between the head cover 14 and the rod cover 16.

Further, a second port 50 extending in a direction perpendicular to the axis of the rod cover 16 is formed on the outside of the rod cover 16, and pressure fluid is supplied to the second port 50 through a pipe (not shown).・ Is discharged.

On the other hand, at the central portion of the rod cover 16, a second concave portion (housing hole) 52 having a circular cross section opened to face the cylinder tube 12 side (arrow B direction) and a second concave portion communicated with the second concave portion 52 A cushion chamber 54 and a rod hole 56 communicating with the second cushion chamber 54 are formed.

In the second recess 52, a ring-shaped second holder 58 is press-fitted and fixed, and a second communication passage (passage) 60 recessed radially outward from the inner circumferential surface is formed.

As shown in FIGS. 6 and 7, the second communication passage 60 is formed, for example, in a rectangular shape in cross section, and provided at a position in the second recess 52 substantially in the same direction as the opening direction of the second port 50. The second communication passage 60 includes a horizontal portion (first passage portion) 36 b extending in the same cross section along the axial direction from the opening of the second recess 52, and the second recess 52 from the end of the horizontal portion 36 b. And a vertical portion (second passage portion) 38b extending in the vertical direction (the direction of the arrow C) toward the center side.

That is, the horizontal portion 36b communicates with the cylinder chamber 20 by opening to the cylinder chamber 20 side (the direction of the arrow B), and the lower end portion of the vertical portion 38b communicates with the second cushion chamber 54 described later. The cylinder chamber 20 of the cylinder tube 12 and the second cushion chamber 54 communicate with each other through the second communication passage 60. Although both the horizontal portion 36 b and the vertical portion 38 b are formed in a rectangular shape in cross section, the present invention is not limited to the case where the horizontal portion 36 b and the vertical portion 38 b are formed in a rectangular shape in cross section.

Further, the second communication passage 60 is formed at the same time when the rod cover 16 is manufactured by casting, and after the rod cover 16 is formed by casting, it is formed by another process such as cutting Absent.

The second cushion chamber 54 is, for example, a space which is formed to be smaller in diameter and coaxial with the second recess 52 and is closed by the end of the rod cover 16. The second cushion chamber 54 communicates with the second port 50 provided on the outer peripheral side, and also communicates with the cylinder chamber 20 through the second communication passage 60.

The rod hole 56 is adjacent to the second cushion chamber 54, and has a diameter smaller than that of the second cushion chamber 54, and is opened by penetrating to the other end of the rod cover 16 and a bush 62 is formed on the inner circumferential surface thereof. And a rod packing 64 is provided. Then, the bush 62 guides the piston rod 66 inserted in the rod hole 56 along the axial direction (arrows A and B directions), and the rod packing 64 passes between the piston rod 66 and the rod cover 16. Prevent leakage of pressure fluid.

The second holder 58 is formed of an annular body having a second cushion hole (insertion hole) 68 at its center, and the second holder 58 is press-fit into the second recess 52 so that the outer peripheral surface thereof (2) The inner peripheral surface of the recess 52 is fitted and fixed. Further, the end face of the second holder 58 is fixed so as to abut on the wall surface of the second recess 52 provided at the boundary with the rod hole 56.

By thus mounting the second holder 58 in the second recess 52, the inner peripheral side of the horizontal portion 36b in the second communication passage 60 and the cylinder tube 12 side of the vertical portion 38b respectively have the outer peripheral surface of the second holder 58. And it is covered by the end face, and it becomes a passage through which pressure fluid flows.

In other words, when the second holder 58 is not attached, the second communication passage 60 is in the state where the inner peripheral side of the rod cover 16 and the cylinder tube 12 side are open, and the inner peripheral side and the cylinder tube A passage having a rectangular cross section in which each of the 12 sides is covered is configured.

Further, a second cushion packing (seal member) 70 is attached to the second cushion hole 68 through an annular groove formed on the inner peripheral surface thereof. The second cushion packing 70 is annularly formed of, for example, an elastic material such as rubber, and is provided so as to protrude to the inner peripheral side with respect to the inner peripheral surface of the second cushion hole 68. Then, when a second cushion rod (rod) 80 described later is inserted into the second cushion hole 68, the outer peripheral surface of the second cushion rod 80 is in sliding contact with the second cushion packing 70.

The piston 18 is formed, for example, in a disk shape, as shown in FIGS. 1 and 8, and one end of a piston rod 66 is inserted and caulked in the center thereof to be integrally connected. Further, a piston packing 72, a magnetic body 74 and a wear ring 76 are mounted on the outer peripheral surface of the piston 18 via an annular groove.

A first cushion rod 78 is coaxially formed on one end face of the piston 18 facing the head cover 14 and provided so as to protrude from the one end face by a predetermined length. The first cushion rod 78 is formed in a hollow shape having a hole 82 at the center, and the tip thereof is formed so as to gradually decrease in diameter in the direction of separating from the piston 18 (arrow B direction). . The first cushion rod 78 is not limited to the hollow shape, and may have a solid shape without the hole 82.

On the other hand, a cylindrical second cushion rod 80 is provided on the other end surface side of the piston 18 facing the rod cover 16 so as to cover the outer peripheral side of the piston rod 66. The second cushion rod 80 is formed to project by a predetermined length with respect to the other end surface of the piston 18 and is gradually contracted in the direction (the arrow A direction) in which the tip is separated from the piston 18 It is formed to be diameter.

A pair of dampers 84a and 84b are provided on the outer peripheral surfaces of the first and second cushion rods 78 and 80 so as to abut on one end surface and the other end surface of the piston 18, respectively. The dampers 84a and 84b are formed of, for example, an elastic material such as rubber or urethane, and are formed in a disk shape having holes through which the first and second cushion rods 78 and 80 can be inserted at the center thereof. Then, when the piston 18 is displaced along the axial direction (the directions of arrows A and B), the dampers 84 a and 84 b abut the end faces of the head cover 14 and the rod cover 16 to buffer the impact.

The piston rod 66 comprises a shaft having a predetermined length along the axial direction (arrows A and B), one end of which is connected to the piston 18 and the other end is a rod hole 56 of the rod cover 16. And is displaceably supported by the bush 62. Further, a substantially central portion in the axial direction of the piston rod 66 is inserted into the second cushion hole 68 of the second holder 58.

The fluid pressure cylinder 10 according to the embodiment of the present invention is basically configured as described above, and next, its operation and effects will be described. The piston 18 shown in FIG. 1 is displaced toward the head cover 14 (the direction of the arrow B), and the first cushion rod 78 is accommodated in the first cushion chamber 30 through the first holder 32 as an initial position. .

First, pressure fluid is introduced into the first cushion chamber 30 by introducing pressure fluid from the pressure fluid source (not shown) into the first port 26. In this case, the second port 50 is open to the atmosphere under switching action by switching means (not shown). As a result, pressure fluid is supplied from the first cushion chamber 30 to the cylinder chamber 20 through the first communication passage 34 and to the hole 82 of the first cushion rod 78.

At the same time, the pressure fluid flows into the first cushion hole 40 to move the first cushion packing 42 toward the rod cover 16 (in the direction of the arrow A), and the cylinder is passed through the outer periphery of the first cushion packing 42. It circulates to the room 20 side.

As a result, the piston 18 is pressed toward the rod cover 16 (in the direction of arrow A). Then, the piston rod 66 is displaced together under the action of displacement of the piston 18, and while the first cushion rod 78 is in sliding contact with the first cushion packing 42 of the first holder 32, the cylinder chamber 20 side is gradually Move in the direction of arrow A).

At this time, the air remaining in the cylinder chamber 20 between the piston 18 and the rod cover 16 flows into the second cushion chamber 54 through the second communication passage 60 and at the same time, the outer peripheral surface of the piston rod 66 and the After flowing into the second cushion chamber 54 through the gap between the second cushion packing 70 and the second cushion packing 70, the second cushion chamber 54 is discharged from the second port 50 to the outside.

Then, the piston 18 further moves toward the rod cover 16 (in the direction of the arrow A), whereby the other end of the piston rod 66 gradually protrudes to the outside of the rod cover 16 and the second cushion rod 80 It is inserted into the second cushion hole 68 of the second holder 58 from the front end, and the second cushion packing 70 is inserted while being in sliding contact with the outer peripheral surface thereof.

As a result, the gap between the second cushion packing 70 of the second holder 58 and the piston rod 66 is closed by the second cushion rod 80, and the air in the cylinder chamber 20 passes through only the second communication passage 60 and the second port 50. Will be discharged into As a result, the amount of discharge of air from the second port 50 is reduced, so that a part of the air is compressed in the cylinder chamber 20 to provide displacement resistance when the piston 18 is displaced. Gradually decreases as the displacement velocity approaches the displacement end position. That is, the cushioning function capable of reducing the displacement speed of the piston 18 functions.

Finally, the piston 18 is gradually displaced toward the rod cover 16 (in the direction of the arrow A), the second cushion rod 80 is completely accommodated in the second cushion hole 68 and the second cushion chamber 54, and the damper 84b is By coming into contact with the end of the rod cover 16, the piston 18 comes to a displacement end position at which the piston 18 has reached the rod cover 16 (see FIG. 8).

In other words, when the second cushion hole 68 is blocked by the second cushion rod 80, the second communication passage 60 is a fixed orifice for circulating the air in the cylinder chamber 20 toward the second port 50. Act as.

On the other hand, when the piston 18 is displaced in the opposite direction (arrow B direction) to the initial position, the pressure fluid supplied to the first port 26 under the switching action of the switching means (not shown) is While being supplied to the second port 50, it is introduced to the second cushion chamber 54, and the first port 26 is opened to the atmosphere.

The pressure fluid is supplied from the second cushion chamber 54 to the cylinder chamber 20 through the second communication passage 60 and flows into the second cushion hole 68 so that the second cushion packing 70 faces the head cover 14 (arrow It moves in the direction B) and flows to the side of the cylinder chamber 20 through the outer peripheral side of the second cushion packing 70. Thus, the piston 18 is pressed toward the head cover 14 (in the direction of the arrow B). Then, the piston rod 66 is displaced together under the action of displacement of the piston 18, and while the second cushion rod 80 is in sliding contact with the second cushion packing 70 of the second holder 58, gradually from the second cushion chamber 54 to the cylinder chamber 20 side ( Move in the direction of arrow B).

At this time, the air remaining in the cylinder chamber 20 between the piston 18 and the head cover 14 flows into the first cushion chamber 30 through the first communication passage 34 and at the same time, the first holder 32 is opened. After flowing into the first cushion chamber 30 through the first cushion hole 40, the air is discharged to the outside through the first port 26.

Then, the piston 18 further moves toward the head cover 14 (the direction of the arrow B), whereby the other end of the piston rod 66 is gradually stored in the rod hole 56 of the rod cover 16 and the first cushion rod 78 is inserted from the front end into the first cushion hole 40 of the first holder 32, and the first cushion packing 42 is inserted in sliding contact with the outer peripheral surface thereof.

As a result, the first cushion hole 40 is closed by the first cushion rod 78, and the fluid in the cylinder chamber 20 is discharged to the first port 26 only through the first communication passage 34.

By blocking the flow of air through the first cushion hole 40 in this manner, the amount of air discharged from the first port 26 is reduced, and a part of the air is compressed in the cylinder chamber 20, It becomes a displacement resistance when the piston 18 is displaced. As a result, the displacement speed of the piston 18 gradually decreases as it approaches the initial position on the head cover 14 side (arrow B direction). That is, the cushioning function capable of reducing the displacement speed of the piston 18 functions.

Finally, the piston 18 is gradually displaced toward the head cover 14 (the direction of the arrow B), the first cushion rod 78 is completely accommodated in the first cushion hole 40 and the first cushion chamber 30, and the damper 84a is the head cover. By coming into contact with the end of the piston 14, the piston 18 returns to the initial position where it has reached the head cover 14 (see FIG. 1).

In other words, when the first cushion hole 40 is closed by the first cushion rod 78, the first communication passage 34 is a fixed orifice for circulating the air in the cylinder chamber 20 to the first port 26 side. Act as.

As described above, in the present embodiment, in the fluid pressure cylinder 10 having the cushion mechanism, the head cover 14 and the rod cover 16 are formed by casting such as die casting and the first and second recesses formed therein. The first and second communication passages 34, 60 are formed respectively recessed with respect to the inner peripheral surfaces and end faces of the members 28, 52. And, by attaching the ring-shaped first and second holders 32 and 58 to the first and second recesses 28 and 52, an opening along the extending direction of the first and second communication paths 34 and 60 It is possible to form a rectangular passage in cross section which can close the portion and allow the cylinder chamber 20 and the first and second ports 26 and 50 to communicate with each other.

As a result, when the head cover 14 and the rod cover 16 are manufactured by casting, the first and second holders 32, 58 can be assembled only by forming the groove-shaped first and second communication passages 34, 60 simultaneously. The first and second communication paths 34, 60 can be easily formed. Therefore, for example, compared with the case where the communication path is formed by cutting or the like after the head cover and the rod cover are manufactured, the manufacturing process can be shortened and the manufacturing cost can be reduced.

In the head cover 14 and the rod cover 16, the first and second communication passages 34, 60 are formed in the shape of a groove in which the inner peripheral side and the cylinder tube 12 side are open respectively, but the first and second recesses By mounting the ring-shaped first and second holders 32 and 58 to 28 and 52, respectively, the first and second series of rectangular cross sections which are closed on the inner peripheral side and the cylinder tube 12 side, respectively. The passages 34, 60 can be easily configured.

In other words, the first and second communication paths 34 and 60 can be easily formed simply by assembling the first and second holders 32 and 58 with the head cover 14 and the rod cover 16.

The fluid pressure cylinder according to the present invention is, of course, not limited to the above embodiment, and various configurations can be adopted without departing from the scope of the present invention.

Claims (5)

  1. A cylinder tube (12) having a cylinder chamber (20) closed by a pair of cover members (14, 16), and the cylinder tube (12), which is internally provided along the axial direction in the cylinder chamber (20) Piston (18), ports (26, 50) formed in the cover members (14, 16) for supplying and discharging pressure fluid, and axial ends of the piston (18) In a hydraulic cylinder (10) having a rod (66) mounted and displaceably mounted with the piston (18),
    The cover member (14, 16) is formed by casting and has a receiving hole (28, 52) for receiving the rod (78, 80) displaced with the piston (18); 52) is formed with a groove recessed with respect to the inner wall surface, and a ring-shaped holder (32, 58) into which the rod (78, 80) is inserted is attached to the storage hole (28, 52) As a result, the groove is closed along the extending direction to form a passage (34, 60) for communicating the cylinder chamber (20) with the port (26, 50), and the holder (32, 58). Are formed with insertion holes (40, 68) through which the rods (78, 80) are inserted, and the insertion holes (40, 68) are in sliding contact with the outer peripheral surface of the rods (78, 80) Provided with sealing members (42, 70) Fluid pressure cylinder, characterized.
  2. In the fluid pressure cylinder according to claim 1,
    The passage (34, 60) extends in the axial direction of the piston (18), and is in communication with the cylinder chamber (20), the first passage (36a, 36b);
    A second passage (38a, 38b) connected to an end of the first passage (36a, 36b) and in communication with the inside of the cover member (14, 16);
    A fluid pressure cylinder characterized by having.
  3. In the fluid pressure cylinder according to claim 1,
    A fluid pressure cylinder characterized in that the holder (32, 58) is pressed into the receiving hole (28, 52).
  4. In the fluid pressure cylinder according to claim 1,
    The fluid pressure cylinder characterized in that the groove portion is formed in a rectangular shape in cross section or a semicircular shape in cross section.
  5. In the fluid pressure cylinder according to claim 2,
    The passage (34, 60) is formed in an L shape in which the first passage portion (36a, 36b) and the second passage portion (38a, 38b) are substantially orthogonally connected. Fluid pressure cylinder.
PCT/JP2014/066797 2014-04-14 2014-06-25 Fluid pressure cylinder WO2015159444A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014001930 JP3191509U (en) 2014-04-14 Fluid pressure cylinder
JP2014-001930U 2014-04-14

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE212014000255.9U DE212014000255U1 (en) 2014-04-14 2014-06-25 Fluid pressure cylinder
BR212016023145U BR212016023145U2 (en) 2014-04-14 2014-06-25 fluid pressure cylinder.
RU2016140371U RU175843U9 (en) 2014-04-14 2014-06-25 Hydro (pneumatic) cylinder
CN201490001399.9U CN206617390U (en) 2014-04-14 2014-06-25 Fluid pressure cylinder
KR2020167000051U KR200487180Y1 (en) 2014-04-14 2014-06-25 Fluid pressure cylinder

Publications (1)

Publication Number Publication Date
WO2015159444A1 true WO2015159444A1 (en) 2015-10-22

Family

ID=53017740

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/066797 WO2015159444A1 (en) 2014-04-14 2014-06-25 Fluid pressure cylinder

Country Status (7)

Country Link
KR (1) KR200487180Y1 (en)
CN (1) CN206617390U (en)
BR (1) BR212016023145U2 (en)
DE (1) DE212014000255U1 (en)
RU (1) RU175843U9 (en)
TW (1) TWM495452U (en)
WO (1) WO2015159444A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108779787A (en) * 2016-03-17 2018-11-09 Smc株式会社 Hydraulic cylinder

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6292483B2 (en) 2015-06-11 2018-03-14 Smc株式会社 Fluid pressure cylinder
JP6403073B2 (en) 2015-06-11 2018-10-10 Smc株式会社 Fluid pressure cylinder
JP6519865B2 (en) 2015-06-11 2019-05-29 Smc株式会社 Fluid pressure cylinder
JP6403071B2 (en) 2015-06-11 2018-10-10 Smc株式会社 Fluid pressure cylinder
JP6519864B2 (en) 2015-06-11 2019-05-29 Smc株式会社 Fluid pressure cylinder
JP6403072B2 (en) 2015-06-11 2018-10-10 Smc株式会社 Fluid pressure cylinder
TWI615553B (en) * 2016-08-31 2018-02-21 Precision Machinery Res And Development Center Hydrostatic cylinder and method for establishing hydrostatic pressure
JP6598083B2 (en) * 2016-12-06 2019-10-30 Smc株式会社 Piston assembly and fluid pressure device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4813692U (en) * 1971-07-03 1973-02-15
JPS5437795U (en) * 1977-08-20 1979-03-12
JPH0478310U (en) * 1990-11-22 1992-07-08
JPH11230117A (en) * 1998-02-18 1999-08-27 Kayaba Ind Co Ltd Hydraulic cylinder
JPH11294414A (en) * 1998-03-04 1999-10-26 Buemach Eng Internatl Bv Brake constitution body in stroke terminal position
JP2002266813A (en) * 2001-03-13 2002-09-18 Taiyo Ltd Cylinder cover for fluid pressure cylinder and fluid pressure cylinder
JP2010266054A (en) * 2009-05-18 2010-11-25 Smc Corp Fluid pressure cylinder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008133920A (en) 2006-11-29 2008-06-12 Smc Corp Hydraulic cylinder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4813692U (en) * 1971-07-03 1973-02-15
JPS5437795U (en) * 1977-08-20 1979-03-12
JPH0478310U (en) * 1990-11-22 1992-07-08
JPH11230117A (en) * 1998-02-18 1999-08-27 Kayaba Ind Co Ltd Hydraulic cylinder
JPH11294414A (en) * 1998-03-04 1999-10-26 Buemach Eng Internatl Bv Brake constitution body in stroke terminal position
JP2002266813A (en) * 2001-03-13 2002-09-18 Taiyo Ltd Cylinder cover for fluid pressure cylinder and fluid pressure cylinder
JP2010266054A (en) * 2009-05-18 2010-11-25 Smc Corp Fluid pressure cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108779787A (en) * 2016-03-17 2018-11-09 Smc株式会社 Hydraulic cylinder

Also Published As

Publication number Publication date
BR212016023145U2 (en) 2017-11-28
RU175843U1 (en) 2017-12-21
KR200487180Y1 (en) 2018-09-20
TWM495452U (en) 2015-02-11
RU175843U9 (en) 2018-03-23
CN206617390U (en) 2017-11-07
DE212014000255U1 (en) 2016-10-24
KR20160004318U (en) 2016-12-16

Similar Documents

Publication Publication Date Title
KR102135842B1 (en) Fluid pressure cylinder
US7913613B2 (en) Piston/cylinder unit
DE60214626T2 (en) Spray nozzle for piston cooling
US7172058B2 (en) Vibration damper with amplitude-dependent damping force
JP4737453B2 (en) Fluid pressure cylinder
US2742929A (en) Pressure storage device
TWI565881B (en) Rotary actuator
ES2599702T3 (en) Shock absorber
WO2013190961A1 (en) Double-rod type shock absorber
CN102913503B (en) Fluid pressure cylinder
US8302526B2 (en) Sealing structure for fluid pressure device
CN101668948A (en) Pneumatic pump
CN107636344A (en) Hydraulic compression stop dog component for the hydraulic damper of vehicle suspension
US5495923A (en) Elastomeric shock absorber
US7798052B2 (en) Fluid pressure cylinder
US8156955B2 (en) Inflating nozzle assembly
JP2014015994A (en) Valve structure of buffer
CN206617390U (en) Fluid pressure cylinder
US9835220B2 (en) Shock absorber with hydraulic rebound system
RU2608986C2 (en) Two-way damper
ES2755276T3 (en) Gas spring
US20030047398A1 (en) Hydraulic shock absorber
KR101463453B1 (en) Gas spring with guide
KR20110127611A (en) Fluid pressure apparatus
US7900549B2 (en) Cushion ring and fluid-pressure cylinder

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14889232

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 212014000255

Country of ref document: DE

WWE Wipo information: entry into national phase

Ref document number: MX/U/2016/000472

Country of ref document: MX

ENP Entry into the national phase in:

Ref document number: 20167000051

Country of ref document: KR

Kind code of ref document: U

122 Ep: pct application non-entry in european phase

Ref document number: 14889232

Country of ref document: EP

Kind code of ref document: A1

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 212016023145

Country of ref document: BR

ENP Entry into the national phase in:

Ref document number: 212016023145

Country of ref document: BR

Effective date: 20161004