JP3456966B2 - Cylinder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder, and more particularly, to a cylinder which can be disassembled as a kind of actuator utilizing hydraulic pressure, water pressure, atmospheric pressure and the like.

[0002]

2. Description of the Related Art FIG. 10 is a schematic sectional view showing an example of a conventional cylinder which is the background of the present invention. In this cylinder 1, the end covers 3 and 4 located at both ends of the cylinder tube 2 and the cylinder tube 2 are joined by crimping both ends of the cylinder tube 2 to the end covers 3 and 4. That is, the groove 5 is provided on the outer periphery of the fitting portion of the end covers 3 and 4, and the end edge portion of the cylinder tube 2 is narrowed and fixed in the groove 5 by a roller or the like. Further, there is also an example in which a part of the end covers 3 and 4 is crushed by a roller or the like so that the fitting between the end edge portion of the cylinder tube 2 and the groove 5 of the end covers 3 and 4 does not come off.

[0003]

However, as shown in FIG.
In the conventional cylinder shown in Fig. 2, the cylinder tube 2 and the end covers 3 and 4 cannot be disassembled. Therefore, when the seal member 6 provided in each portion of the cylinder 1 is worn or deteriorated, only that portion may be replaced. It could not be repaired and in such cases the entire cylinder 1 had to be replaced. Also, because it is difficult to disassemble,
It was also difficult to separate and recycle different parts. Therefore, conventional cylinders cannot meet the demand for resource saving and recycling.

Further, conventionally, a bolt portion formed at both ends of an elongated rod-shaped connecting member is inserted into an end cover, and a nut is detachably screwed to the bolt portion, whereby the end cover is attached to the cylinder tube. Some are detachably attached. However, in this case, many slender rod-shaped connecting members have to be arranged on the side of the cylinder tube, so that the appearance is not smart. Also,
If a cover that covers the connecting member is attached, a larger space is required to install the cylinder.

Further, in these conventional examples, the cylinder tube and the end cover are fixed and the direction of the port hole provided in the end cover cannot be freely changed. Lacked the degree of freedom.

Therefore, a primary object of the present invention is to provide a smart and compact cylinder that can be disassembled and repaired.

[0007]

According to the present invention, there is provided a cylinder tube, a piston slidably moving in the cylinder tube, a piston rod having one end fixed to the piston and the other end extending from the cylinder tube. A cylinder including an end cover that is externally or internally fitted to the cylinder tube to seal an end portion of the cylinder tube, and a lock nut screwed to the end cover to detachably fix the end cover to the cylinder tube. The end of the cylinder tube to the side wall of the cylinder tube.
Formed integrally with the cylinder tube at an intersecting angle
Flange portion is formed, one end of the cylinder tube
Flange is the direction that intersects the side wall of the cylinder tube
Is formed to be inclined toward the outer side of the
Lock nut and end cover installed externally on the Linda tube
And the flange on the other end of the cylinder tube.
Part is inward in the direction intersecting the side wall of the cylinder tube.
It is formed to incline toward, and the flange part is a cylinder
Between the end cover and lock nut installed inside the tube.
A cylinder in which the cylinder tube, the end cover, and the lock nut are detachably fixed by being held and sandwiching the flange portion between the end cover and the lock nut.

[0008]

[0009]

In the present invention, it is preferable to sandwich a seal member between the spigot portion of the end cover or the lock nut and the flange portion.

Further, in the present invention, it is preferable that a flow path is formed which penetrates the end cover and communicates with the inside of the cylinder tube.

In the cylinder according to the present invention, the end cover and the lock nut are detachably screwed together,
By sandwiching the flange portion of the cylinder tube from both sides, the end cover, lock nut, and cylinder tube can be fixed together. Therefore, by removing the end cover and the lock nut, the three members can be easily disassembled, and various parts inside the cylinder tube can be repaired. Also, it can be a smart and compact cylinder. Further, since the end cover can be rotated with the fastening between the end cover and the lock nut being slightly loosened, when the flow path is provided on the side wall of the end cover, the opening (port) of the flow path is formed.
The orientation of can be changed 360 degrees. Therefore, this cylinder has a high degree of freedom in installation and piping during construction.

Further, in the present invention, it is preferable that the inner surface of the cylinder tube is coated with paint or enamel.
In that case, since the smoothness can be increased without machining the inner surface of the cylinder tube with high precision,
The processing cost can be reduced.

Further, in the present invention, the inner and outer surfaces of the cylinder tube may be coated with the same paint or enamel. In that case, the smoothness can be improved without machining the inner surface of the cylinder tube with high precision, and the outer surface can be coated, so that the processing cost can be further reduced.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments of the invention with reference to the drawings.

[0016]

1 is a perspective view showing an example of an embodiment of a cylinder according to the present invention. The cylinder 10 includes a cylinder tube 12. FIG. 2 is a side view solution diagram of a cylinder tube used in the cylinder shown in FIG. 1. The cylinder tube 12 is a pipe made of metal such as aluminum, steel, and stainless steel. The inside of the cylinder tube 12 has a cylindrical shape with the same inner diameter from the left side to the right side in the drawing. An outward flange portion 14 is formed at the left end of the cylinder tube 12 in the drawing. The outward flange portion 14 is formed such that the extension line diagonally intersects the center line of the cylinder tube 12. This angle is preferably, for example, about 30 ° to 60 °, but is not particularly limited. The outward flange portion 14 is formed by expanding the illustrated left end edge portion of the cylinder tube 12 in a trumpet shape over the entire circumference. On the other hand, an inward flange portion 16 is formed at the right end of the cylinder tube 12 in the figure. The inward flange portion 16 is formed by extending obliquely so that the extension line intersects the center line of the cylinder tube 12 at an angle of about 45 degrees. The inward flange portion 16 is formed by narrowing the illustrated right end edge portion of the cylinder tube 12 inward over the entire circumference.

FIG. 3 is an enlarged schematic view of the left end of the cylinder shown in FIG. 1, and FIG. 4 is a sectional schematic view thereof. A piston 18 is slidably incorporated in the cylinder tube 12. A plurality of annular piston backings 20 that prevent pressure leakage before and after the sliding direction of the piston 18 are fitted to the outer peripheral portion of the piston 18. Piston packing 20
The cross-sectional shape of each is, for example, substantially V-shaped. At the center of one main surface of the piston 18, the piston rod 2
One end of 4 is screwed with a washer 22 interposed. The other end of the piston rod 24 extends outside the cylinder tube 12.

An external end cover 26 is fitted to the left end of the cylinder tube 12 in the drawing from the outside. A spigot portion 28 is formed on the external end cover 26 so as to surround a surface fitted to the cylinder tube 12. Inlay part 2
8 has a surface orthogonal to a surface extending parallel to the center line of the cylinder tube 12. External end cover 26
The cylinder tube 12 and the cylinder tube 12 are fitted together at the spigot portion 28. At that time, an elastic O-ring 30 is arranged as a seal member in a ring-shaped gap having a triangular cross section formed by being surrounded by mutually orthogonal surfaces of the spigot portion 28 and diagonally extending surfaces of the outward flange portion 14. It

A through hole is formed in the central portion of the external end cover 26 so as to coincide with the center line of the cylinder tube 12, and the piston rod 24 is slidably inserted into the through hole. The external end cover 26 is provided with a rod packing 32 for sliding while sealing the space with the piston rod 24, and a dust seal 34. That is, the external end cover 26 seals one end of the cylinder tube 12 and also functions as a rod cover that slidably supports the piston rod 24.

Also, on the side wall of the external end cover 26,
Port 36 extending in a direction orthogonal to piston rod 24
Is drilled. Further, inside the outer end cover 26, a flow path 38 is bored that communicates with the boat 36 from around the piston rod 24 and into the cylinder tube. The number and thickness of the flow passages 38 extending in parallel with the piston rod 24 around the piston rod 24 are appropriately selected.
The ports 36 and 52 and the flow path 38 allow a pressure medium (a liquid such as pressure oil or pressure water or a gas such as compressed air) to flow in and out of the cylinder tube 12.

Further, a cylindrical lock nut 40 is fitted on the cylinder tube 12. One end side of the lock nut 40 having a small inner diameter is externally fitted to the outer peripheral portion of the cylinder tube 12, and the other end side having a large outer diameter is the external end cover 26.
Is fitted on. In the middle of the inner wall surface of the lock nut 40,
An annular engagement portion 40a having a surface that extends obliquely at the same angle as the outward flange portion 14 is formed. The engaging portion 40a is brought into contact with the sloped surface of the outward flange portion 14 on the side opposite to the external end cover 26. When the female screw 40b formed on the inner wall of the lock nut 40 and the male screw 26a formed on the outer wall of the outer end cover 26 are screwed together and tightened, the engaging portion 40a causes the outward flange portion 14 to move outward. 26
The outward flange portion 14 is sandwiched between the engaging portion 40a of the lock nut 40 and the external end cover 26 by pressing in the direction. At this time, the O-ring 30 has the outward flange portion 14
And the spigot portion 28 are compressed and elastically deformed to completely seal between them.

FIG. 5 (A) is an end view solution showing the right end of the cylinder shown in FIG. 1, and FIG. 5 (B) is a side view solution showing the right end side of the cylinder shown in FIG. [Fig. 2] is a schematic sectional view showing a right end side of the cylinder shown in Fig. 1.

An internal end cover 44 is fitted to the right end of the cylinder tube 12 in the figure from the inside. A spigot portion 46 is formed on the inner end cover 44 so as to surround a surface extending outward from the inside of the cylinder tube 12. The inlay portion 46 has a surface orthogonal to a surface extending parallel to the center line of the cylinder tube 12. An O-ring 48 having elasticity is disposed as a seal member in a triangular gap formed by being surrounded by mutually orthogonal surfaces of the spigot portion 46 and diagonally extending surfaces of the inward flange portion 16. Further, a through hole is formed in the central portion of the inner end cover 44 as a flow path extending so as to coincide with the center line of the cylinder tube 12, and the through hole serves as the port 52.

Further, a cylindrical lock nut 50 is fitted on the portion of the inner end cover 44 extending from the cylinder tube 12. One end of the lock nut 50 is fitted onto the outer peripheral portion of the internal end cover 44, and the other end of the lock nut 50 extends obliquely at the same angle as the inward flange 16.
0a is formed. The engaging portion 50a is the inward flange portion 16
Abutting the outer slope of the. When the female screw 50b formed on the inner wall of the lock nut 50 and the male screw 44a formed on the outer wall of the internal end cover 44 are screwed together and tightened,
The inner end cover 44 is urged to the outside of the cylinder tube 12, and the inward flange portion 1 is provided between the spigot portion 46 of the inner end cover 44 and the engaging portion 50a of the lock nut 50.
6 is clamped. At this time, the O-ring 48 is compressed and elastically deformed between the surfaces of the spigot portion 46 orthogonal to each other and the inner inclined surface of the inward flange portion 16 to completely seal the both.

External end cover 26, lock nut 4
0, the internal end cover 44, and the side wall of the lock nut 50, respectively, have a tool engaging portion 42 for engaging a tool during disassembly and assembly to perform work such as tightening and removing.
Is formed. The tool fastening portion 42, as shown in FIG.
It may be a recess or a notch for engaging the key spanner, or may be subjected to a slitting process for engaging the spanner or the like as shown in FIG.

In the cylinder 10 of this embodiment, the outward flange portion 14 is provided at one end of the cylinder tube 12,
Since the inward flange 16 is provided at the other end, the internal end cover 44, the piston 18 and the like can be inserted into the cylinder tube 12 from the left side in FIG. 2, and the lock nut 40 and the like in the right side in FIG. Can be externally fitted to the cylinder tube 12. Therefore, the structure is simple and the assembly is easy.

Further, in the cylinder 10 of this embodiment,
Since the external end cover 26 and the lock nut 40 can be easily attached and detached, and the internal end cover 44 and the lock nut 50 can be easily attached and detached, disassembly and repair can be easily performed when the O-ring or packing in the cylinder tube 12 is worn. be able to. Further, by loosening the screw engagement between the external end cover 26 and the lock nut 40, the external end cover 26 can be rotated 360 degrees around the central axis of the cylinder tube 12. After that, the direction of the port 36 is also fixed by fastening the external end cover 26 and the lock nut 40. Therefore, the direction of the port 36 provided on the external end cover 26 can be freely set again, and piping and the like can be easily put together, assembling can be labor-saving, and aesthetics can be improved. When a port is provided on the side surface of the internal end cover 44, the screwing with the lock nut 50 can be similarly loosened to appropriately adjust the direction of the port.

Further, the outward flange 14 and the inward flange 16 are formed so as to extend obliquely with respect to the cylinder tube 12, and between the inlay portion 28 of the outer end cover 26 and the inlay portion 46 of the inner end cover 44. By properly compressing and sandwiching the O-rings 30 and 48 in the annular gaps of the isosceles triangles in cross section formed respectively,
Since both ends of the cylinder tube 12 are hermetically sealed, the structure is simple and the cylinder tube 12 can be assembled in the minimum space in the longitudinal direction.

FIG. 7 is a partial cross-sectional schematic view showing an enlarged main part of another embodiment according to the present invention. The cylinder 10 shown in FIG. 7 differs from that shown in FIG. 4 in the method of compressing and sandwiching the O-ring 30 for keeping the outer end cover 26 and the cylinder tube 12 sealed. In this embodiment, an annular O-ring groove 29 is formed in the spigot portion of the external end cover 26.
Is provided, and the O-ring 30 is housed in the O-ring groove 29. Then, the O-ring groove 29 and the cylinder tube 1
The O-ring 30 is compressed by the inner diameter surface of No. 2 to keep the airtightness. Further, the external end cover 26 has a fastening portion 26a extending at the same angle as the outer slope of the outward flange portion 14.
The engaging portion 26a and the engaging portion 4 of the lock nut 40.
The outward flange portion 14 is sandwiched between it and 0a. In this structure, since the O-ring groove 29 is required to be provided, the total length of the external end cover 26 is slightly longer than that of the first embodiment, but the cylinder tube 12 and the outward flange portion 14 are not provided.
The concentricity is less required than in the first embodiment, and there is an advantage that the processing is easy.

FIG. 8 is a partial cross sectional view showing a main part of still another embodiment according to the present invention. Cylinder 1 in FIG.
0 is a structure in which the piston rod 24 is extended from the inner end cover 44 side of the cylinder tube 12. Further, a port 52 is provided on the side wall of the inner end cover 44, and the flow path 54 is formed so as to extend obliquely in a direction intersecting with the piston rod 24. This structure has a cylinder 10
Is suitable when the diameter is relatively large. Further, the inner end cover 44 includes an engaging portion 44b extending at the same angle as the outer slope of the inward flange portion 16, and the outward flange portion 1 is provided between the engaging portion 44b and the engaging portion 50a of the lock nut 50.
Holds 6

The piston rods may be extended from both ends of the cylinder tube 12.

FIG. 9 is an enlarged schematic view showing the state of the inner surface of the cylinder tube of the present invention. The cylinder tube 12 is formed of a seamless pipe such as stainless steel, steel pipe, and aluminum pipe which can satisfy the circularity of the inner diameter to some extent. Then, the inner surface is coated by means such as Teflon (registered trademark) coating, epoxy resin powder electrostatic coating, resin or enamel processing. As a result, the smoothness of the inner surface of the cylinder tube 12 can be increased, the wear resistance can be improved, and the friction between the packing and the piston can be reduced. In this case, since the smoothness can be increased without machining the surface of the cylinder tube 12 with high precision, the processing cost can be reduced.

Further, in the present invention, the inner and outer surfaces of the cylinder tube 12 may be coated with the same paint or the like by a dipping method or the like. In this case, the smoothness of the inner surface of the cylinder tube 12 can be improved without machining the inner surface of the cylinder tube 12 with high precision, and at the same time, the outer surface can be coated, so that the processing cost can be further reduced. Similarly,
The inner and outer surfaces of the cylinder tube 12 may be covered with enamel.

[0034]

According to the cylinder of the present invention, since the end cover and the lock nut are detachably provided, when the O-ring or packing in the cylinder tube is worn away, disassembly and repair, separation and disposal, It can be easily recycled. Further, it is not necessary to dispose an elongated rod-shaped connecting member around the cylinder tube, and the structure is simple and smart. Furthermore, by loosening the screwing between the end cover and the lock nut, the orientation of the port provided on the side surface of the end cover can be freely set again, which makes it easier to put together piping and saves assembly work, and also has a beautiful appearance. improves.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a cylinder according to the present invention.

FIG. 2 is a side view solution view showing a cylinder tube used in the cylinder shown in FIG. 1 by cutting out a part thereof.

3 is an illustrative view showing an enlarged left end of the cylinder shown in FIG. 1 in the figure.

FIG. 4 is a cross-sectional schematic view of the left end of the cylinder shown in FIG.

5A is an end view solution diagram showing the right end of the cylinder shown in FIG. 1, and FIG. 5B is a side view solution view showing the right end side of the cylinder shown in FIG.

FIG. 6 is a cross-sectional view showing the right end side of the cylinder shown in FIG.

FIG. 7 is an illustrative view showing a part of a main part of another embodiment according to the invention in an enlarged scale.

FIG. 8 is an illustrative view showing a notched part of a main part of still another embodiment according to the present invention, which is enlarged.

9 is an enlarged schematic view showing the state of the inner surface of the cylinder tube shown in FIG.

FIG. 10 is a schematic sectional view showing an example of a conventional cylinder which is the background of the present invention.

[Explanation of symbols]

10 cylinders 12 cylinder tube 14 Outward flange 16 Inward flange 18 pistons 20 Piston packing 22 washers 24 piston rod 26 External end cover 28 Inlay part 30 O-ring 32 Rod packing 34 Dust seal 36 ports 38 channels 40 lock nut 40a fastening part 40b female screw 42 Tool fastening part 44 Internal end cover 46 Inlay part 48 O-ring 50 lock nuts 50a fastening part 50b male screw 52 ports

Claims (5)

(57) [Claims] 1. A cylinder tube, a piston slidably moving in the cylinder tube, a piston rod having one end fixed to the piston and the other end extending from the cylinder tube, and an external piston rod attached to the cylinder tube. A cylinder including an end cover that is fitted or internally fitted to seal an end portion of the cylinder tube, and a lock nut screwed to the end cover to detachably fix the end cover to the cylinder tube, the end of the cylinder tube, the cylinder Chu
The cylinder tube at an angle that intersects the side wall of the cylinder at an angle.
And a flange portion integrally formed with the cylinder tube.
Toward the outside in the direction intersecting the side wall of the Linda tube
It is formed to be inclined, and the flange portion is formed in the cylinder tube.
The lock nut and the end cover that are externally provided on the
And the flange part at the other end of the cylinder tube is
Inward in the direction intersecting the side wall of the Linda tube
It is formed to be inclined, and the flange portion is formed in the cylinder tube.
The end cover and the lock nut installed inside
A cylinder in which the cylinder tube, the end cover and the lock nut are detachably fixed by sandwiching the flange portion between the end cover and the lock nut. 2. The cylinder according to claim 1, wherein a seal member is sandwiched between the spigot portion of the end cover or the lock nut and the flange portion. 3. A flow path through said end cover leads into the cylinder tube is formed, according to claim 1 or
The cylinder according to claim 2 . Wherein said cylinder tube inner surface is covered with paint or enamel, cylinder according to any one of claims 1 to 3. Wherein said cylinder tube is coated with the same paint or enamel on both inner and outer surfaces, cylinders of claim 4.