JPH0596636U - gasket - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a gasket which has good sealing properties and can be easily mounted. [Structure] The gasket 1 is formed by bonding an elastic body 5 to the surface of the metal ring 2. The metal ring 2 is formed by an extension part 4 having one end extending inward and an upright part 3 having the other end upright.
Form a loop. The elastic body 5 is vulcanized and adhered to the entire surface of the metal ring 2. At this time, the seal portion 6 is formed on the extension portion 4. The seal portion 6 has a tapered portion 5b formed at its tip and a beat portion 5a formed at the end surface. The gasket 1 is mounted between the opening end surface of the cylinder tube 7 and the cover 8 that closes the opening of the cylinder tube 7. Since the gasket 1 is sandwiched and sealed by the cylinder tube 7 and the cover 8, it is not necessary to form a mounting groove for mounting the gasket 1 on a mating member. The presence of the beat portion 5a improves the sealing property. Since the tapered portion 5 guides inward when the piston seal is inserted, the piston seal is not damaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gasket, and more particularly to a gasket that is mounted between a hydraulic or pneumatic cylinder tube and a cover that closes the opening of the cylinder tube to seal the two.

[0002]

[Prior art and its problems]

 Conventionally, as this type, for example, one using O-rings 22 and 14 as shown in a usage state in FIG. 5 is known.

That is, the O-ring 22 shown in FIG. 5 is mounted in the mounting groove 16 a of the head cover 10 that closes one opening of the cylinder tube 9 to seal the space between the head cover 10 and the cylinder tube 9. The other O-ring 14 is a space between the chamfered portion 15 formed at the other opening end of the cylinder tube 9 and the bottom cover 11 that closes the other opening of the cylinder tube 9. The bottom cover 11 and the cylinder tube 9 are sealed by being mounted on the annular mounting portion 13 formed by.

In FIG. 5, a cylinder tube 9 has a tubular shape with both ends open, and a head cover 10 is attached to one opening and a bottom cover 11 is attached to the other opening. A piston 23 is arranged inside the cylinder tube 9.

The head cover 10 attached to one opening of the cylinder tube 9 has a fitting portion 16 protruding in the center thereof, and the fitting portion 16 is fitted into one opening of the cylinder tube 9. As a result, one opening of the cylinder tube 9 is closed by the head cover 10.

The fitting portion 16 of the head cover 10 is formed with an annular mounting groove 16a that opens to the outer peripheral surface thereof, and the O-ring 22 is mounted in the mounting groove 16a.

The O-ring 22 is an annular seal member made of an elastic material and has an O-shaped cross section. By mounting the O-ring 22 in the mounting groove 16a of the fitting portion 16, the inner peripheral surface of the O-ring 22 is the bottom surface of the mounting groove 16a and the outer peripheral surface is the inner peripheral surface of the cylinder tube 9. In the abutting state, it is interposed between the head cover 10 and the cylinder tube 9.

The bottom cover 11 attached to the other opening of the cylinder tube 9 has a fitting portion 17 protruding to the center thereof, and the fitting portion 17 is fitted to the other opening of the cylinder tube 9. By being fitted, the other opening of the cylinder tube 9 is closed by the bottom cover 11.

At this time, a chamfered portion 15 is formed on the inner peripheral side of the other opening end of the cylinder tube 9, whereby the chamfered portion 15 between the cylinder tube 9 and the bottom cover 11 is formed. The mounting portion 13, which is an annular space, is formed in the.

Then, the O-ring 14 is mounted on the mounting portion 13 formed between the cylinder tube 9 and the bottom cover 11.

The O-ring 14 is an annular seal member made of an elastic material and has an O-shaped cross section. By mounting the O-ring 14 on the mounting portion 13 formed between the cylinder tube 9 and the bottom cover 11, the inner peripheral surface of the O-ring 14 is at the root of the fitting portion 17, The outer peripheral surface of the cylinder tube 9 is in contact with the chamfered portion 15 of the cylinder tube 9, and is interposed between the bottom cover 11 and the cylinder tube 9.

A space between the head cover 10 and the bottom cover 11 is fastened and fixed with bolts 12, and the cylinder tube 9 is sandwiched between the head cover 10 and the bottom cover 11.

A piston 23 is reciprocally disposed inside the cylinder tube 9, and the interior of the cylinder tube 9 is divided into two chambers by the piston 23. One end of a rod 18 penetrating the head cover 10 and freely retractable from the cylinder tube 9 is connected to the piston 23, and the reciprocating motion of the piston 23 causes the rod 18 to reciprocate integrally with the piston 23. Then, it comes and goes from the cylinder tube 9.

In FIG. 5, 19 is a cushion seal, 20 is a piston seal, and 21 is a wiper ring combined type rod seal.

With the above configuration, when hydraulic pressure or pneumatic pressure is introduced / released into the inside of the cylinder tube 9 from the ports (not shown) formed in the head cover 10 and the bottom cover 11, this pressure acts on the piston 23. As a result, the piston 23 reciprocates inside the cylinder tube 9, and with this, the rod 18 connected to the piston 23 comes in and out of the cylinder tube 9.

By mounting the O-ring 22 in the mounting groove 16a of the head cover 10, the inner peripheral surface of the O-ring 22 is the bottom surface of the mounting groove 16a and the outer peripheral surface is the inner peripheral surface of the cylinder tube 9. The head cover 10 and the cylinder tube 9 are sealed by the O-ring 22 because they are arranged in contact with each other to seal the contact surfaces. ..

By mounting the O-ring 14 on the mounting portion 13 formed between the bottom cover 11 and the cylinder tube 9, the O-ring 14 has an inner peripheral surface on the bottom cover 11 and an outer peripheral surface. Are arranged in contact with the cylinder tubes 9, respectively, and seal the contact surfaces, so that the O-ring 14 seals between the bottom cover 11 and the cylinder tube 9. The Rukoto.

However, in the case where the O-rings 22 and 14 are used to seal between the cylinder tube 9 and the covers 10 and 11 as described above, in order to mount the O-rings 22 and 14, the cover 10 is attached. Alternatively, since it is necessary to form the mounting groove 16a or the mounting portion 13 in the cylinder tube 9, the number of man-hours required to process these increases.

Further, in the above-mentioned case, the O-ring 14 may be damaged.

That is, in the case of pneumatic cylinders, the cylinder tube 9 has a smaller wall thickness than that of hydraulic cylinders, and therefore the opening end portion on the side where the chamfered portion 15 is formed is formed. Is easily deformed. Therefore, when the covers 10 and 11 are fastened to the cylinder tube 9 with the bolt 12, a load acts on the opening end portion on the side where the chamfered portion 15 is formed by the tightening force of the bolt 12 to deform the cylinder tube 9. As a result, the O-ring 14 may be damaged and the sealing property may be deteriorated.

An object of the present invention is to provide a gasket that solves the above-mentioned problems, reduces the number of processing steps of the mating member to be mounted, and can secure the sealing property.

[0022]

[Means for solving problems]

 In order to solve the above problems, the present invention is, as a first invention, a gasket that seals between a cylinder tube and a cover that closes the opening of the cylinder tube. The metal ring having an L-shaped cross section with one end extending inward to form an extending portion and the other end standing upright in the axial direction to form an upstanding portion. An elastic member is adhered to the surface of the cylinder to form a seal portion, and the seal portion seals between the opening end surface of the cylinder tube and the cover. In addition, as a second invention including the first invention, it has a structure in which an annular beat portion is formed on an end surface of the seal portion. In addition, as a third invention including the first invention, it has a structure in which a taper portion is formed at the tip portion of the seal portion.

[0023]

[Action]

 This invention adopts the above-mentioned means, and if the gasket is mounted with the upright part fitted to the cylinder tube and the seal part is located between the end surface of the cylinder tube and the cover, the gasket Since the seal part of comes into contact with the end surface of the cylinder tube and the cover and seals these contact surfaces, the gasket seals between the cylinder tube and the cover.

In this case, it is not necessary to process the mounting groove for mounting the gasket on the cylinder tube or the cover which is the mating member.

That is, since this gasket is held in a state of being sandwiched between the cylinder tube and the cover, the gasket mounting groove unlike the conventional case is not required, and the gasket can be easily attached and detached. There is.

By forming the beat portion on the end surface of the seal portion, when the gasket is mounted between the end surface of the cylinder tube and the cover, the beat portion strongly adheres to the mating member. This improves the sealing property.

Further, by forming the taper portion at the tip of the seal portion, when inserting the piston into the cylinder tube, the annular piston seal attached to the piston is prevented from being damaged. ..

That is, since the outer diameter of the piston seal is set to be slightly larger than the inner diameter of the cylinder tube in order to secure the sealing performance, the piston seal is conventionally used when the piston seal is inserted into the cylinder tube. There was a risk that the outer circumference of the cylinder could get caught on the end surface of the cylinder tube and could be damaged. Since the part is guided inward, the piston seal is smoothly inserted into the cylinder tube so that it is not scratched.

[0029]

【Example】

 An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 is a view showing an embodiment of a gasket according to the present invention, and FIG. 2 is a view showing a usage state of the gasket 1 shown in FIG.

That is, the gasket 1 shown in FIG. 1 and FIG. 2 seals the cylinder tube 7 and the cover 8 that closes the opening of the cylinder tube 7 by interposing them therebetween. The surface of the metal ring 2 having an L-shaped cross section with one end forming an inward extending part 4 and the other end forming an erecting part 3 erecting in the axial direction. The sealing member 6 is formed on the extending portion 4 by vulcanizing and adhering the elastic body 5 that covers the entire surface of the sealing member 6, and the annular beat portion 5a is formed on the end surface of the sealing member 6. A taper portion 5b is formed in a portion of the peripheral end portion on the side opposite to the standing direction of the standing portion 3.

Then, by mounting the gasket 1 with one end face of the seal portion 6 in contact with the open end face of the cylinder tube 7 and the other end face of the seal portion 6 in contact with the cover 8, respectively. A gasket 1 seals between the cylinder tube 7 and the cover 8.

In FIG. 1 and FIG. 2, the cylinder tube 7 has a tubular shape with both ends open, and a cover 8 is attached to the opening, and the cylinder tube 7 is not shown in the drawing. Is provided with a piston.

The cover 8 attached to the opening of the cylinder tube 7 has a disk shape having a size capable of closing the opening of the cylinder tube 7, and is formed at the center thereof so as to project annularly. By having the fitting portion 8a fitted into the opening of the cylinder tube 7, the opening of the cylinder tube 7 is closed by the cover 8.

Then, between the cover 8 and the cylinder tube 7, a gasket 1 in which an elastic body 5 is vulcanized and adhered to a metal ring 2 having an L-shaped cross section is mounted.

The metal ring 2 forming a part of the gasket 1 has one circumferential end portion extending inward to form an extending portion 4, and the other circumferential end portion standing upright in the axial direction. To form an upright portion 3, which is formed in an annular shape having an L-shaped cross section as a whole.

Then, the elastic body 5 is vulcanized and adhered to the entire surface of the metal ring 2 with a uniform thickness. At this time, the elastic body 5 is vulcanized and bonded to the extending portion 4 of the metal ring 2 to form the seal portion 6.

On the end surface of the seal portion 6, a plurality of concentric beat portions 5a are formed. In this case, the beat section 5a may be a single piece. Further, at the inner peripheral end which is the tip of the seal portion 6, a chamfer is formed on the peripheral portion of the metal ring 2 on the side opposite to the standing direction of the standing portion 3 to form a tapered portion 5b.

In this case, the inner diameter of the seal portion 6 is set so that the seal portion 6 can be fitted into the fitting portion 8 a of the cover 8. The inner diameter of the upright portion of the gasket 1 is set so that it can be fitted into the cylinder tube 7.

When the gasket 1 formed as described above is mounted between the cylinder tube 7 and the cover 8, the standing portion is fitted to the cylinder tube 7, and the seal portion 6 is attached to the cover 8. It is arranged in a state of being fitted into the fitting portion 8a.

At this time, the end face of the seal portion 6 on the standing portion side is brought into contact with the opening end face of the cylinder tube 7, and the end face of the seal portion 6 opposite to the standing portion is brought into contact with the cover 8, respectively. And the cover 8 is fastened to the cylinder tube 7 with a bolt or the like, whereby the seal portion 6 is held in a state of being sandwiched between the cover 8 and the cylinder tube 7.

Although not shown, a piston is reciprocally disposed inside the cylinder tube 7, and the interior of the cylinder tube 7 is divided into two chambers by this piston. The piston (not shown) is connected to one end of a rod penetrating through the cover 8 and freely retractable from the cylinder tube 7. The rod reciprocates to reciprocate integrally with the piston. It comes out from the cylinder tube 7.

With the above configuration, when hydraulic pressure or air pressure is introduced into or released from the inside of the cylinder tube 7 from a port (not shown) formed in the cover 8, this pressure acts on the piston inside the cylinder tube 7. As a result, the piston moves back and forth inside the cylinder tube 7, and with this, the rod connected to the piston comes in and out of the cylinder tube 7.

Next, the operation of the above will be described.

By mounting the gasket 1 between the cylinder tube 7 and the cover 8 as described above, one end surface of the seal portion 6 is located at the opening end surface of the cylinder tube 7 and the other end portion of the seal portion 6 is provided. End surfaces of the cover 8 come into contact with the end surfaces of the cover 8, respectively, and these contact surfaces are sealed.

At this time, the gasket 1 is interposed between the cylinder tube 7 and the cover 8 in a compressed state by the tightening force of a bolt (not shown). The sealing force is secured by the elastic force.

In this case, since the beat portion 5a is formed on the end surface of the seal portion 6, when the bolt is tightened, the beat portion 5a is strongly adhered to the opening end surface of the cylinder tube 7 and the cover 8. Therefore, the sealing property is improved.

In the gasket 1 described above, it is not necessary to process the mounting groove and the mounting portion, which were conventionally required for mounting, into the mating member.

That is, the gasket 1 is held by sandwiching the seal portion 6 between the opening end surface of the cylinder tube 7 and the cover 8 in a state where the standing portion is fitted to the cylinder tube 7. Therefore, the gasket 1 can be easily positioned and securely mounted without forming a mounting groove or a mounting portion in the cover 8 or the cylinder tube 7 which is a mating member as in the conventional case. ..

Since it is not necessary to process the mounting portion on the mating member, especially the cylinder tube 7, the rigidity of the cylinder tube 7 can be secured, and therefore, even if the bolt is tightened. The deformation of the cylinder tube 7 unlike the conventional case is not caused at all, so that the damage of the gasket 1 due to the deformation of the cylinder tube 7 can be prevented.

Furthermore, in this gasket 1, the annular piston seal (not shown) mounted on the piston is not damaged during assembly.

That is, since the taper portion 5b is formed at the tip of the seal portion 6 of the gasket 1, when the piston seal is inserted inside the seal portion 6, the outer peripheral portion of the piston seal is the taper portion 5b. It is supposed to be guided inward.

That is, the piston seal that slides between the piston and the cylinder tube 7 to seal the piston tube from the opening of the cylinder tube 7 in the state of being mounted in the annular mounting groove formed on the outer peripheral surface of the piston. At this time, the piston seal is inserted into the cylinder tube 7 by inserting the gasket 1 into the opening of the cylinder tube 7 and then inserting the inside of the seal portion 6 of the gasket 1 into the cylinder seal. I am trying to do it.

At this time, since the outer diameter of the piston seal is formed to be slightly larger than the inner diameter of the cylinder tube 7 in order to ensure the sealing performance, when the piston seal is inserted inside the gasket 1, In the past, the outer peripheral portion of the piston seal was caught by the seal portion 6 of the gasket 1 and the piston seal was damaged, but in the above gasket 1, the tapered portion 5b is formed on the seal portion 6. Since the outer peripheral portion of the piston seal is smoothly guided inward by the tapered portion 5b, the piston seal is not caught on the seal portion 6.

Therefore, the piston seal can be inserted into the inside of the cylinder tube without damaging it, so that defective assembly can be prevented.

A modified example of the gasket 1 shown in FIG. 1 is shown in FIG.

That is, the gasket 31 shown in FIG. 3 is obtained by modifying the shape of the elastic body 5 of the gasket 1 shown in FIG. 1, and the beat portion is formed on the elastic body 35 adhered to the entire surface of the metal ring 2. This is a so-called simple type gasket 31 in which 5a and the tapered portion 5b are not formed, and since the other structure is the same as that of the above-mentioned embodiment, detailed description will be omitted by attaching the same reference numerals. ..

Another modified example of the gasket 1 shown in FIG. 1 is shown in FIG.

That is, the gasket 51 shown in FIG. 4 is obtained by deforming the shape of the elastic body 5 of the gasket 1 shown in FIG. 1, and the elastic body 55 is bonded only to the extending portion 4 of the metal ring 2. Then, the gasket 51 is formed in a state where the upright portion 3 of the metal ring 2 is exposed from the elastic body 55, and the other configurations are the same as those of the above-described embodiment, and therefore, the same reference numerals are given. Therefore, detailed description will be omitted.

[0060]

[Effect of the device]

 As described above, according to the present invention, the gasket in which the elastic member is bonded to the inwardly extending portion of the metal ring having the L-shaped cross section to form the seal portion is the opening end surface of the cylinder tube and the cylinder tube. By sandwiching the seal portion with the cover that closes the opening, the cylinder tube and the cover are sealed, so that it is not necessary to form a mounting groove for mounting the gasket in the mating member. Therefore, the assembling work can be simplified and the gasket can be easily attached and detached.

By forming the beat portion in the seal portion, when the gasket is sandwiched between the cylinder tube and the cover, the contact surface with the mating member comes into close contact with the gasket, thereby improving the sealing performance. The effect is that you can.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a gasket according to the present invention.

FIG. 2 is a view showing a usage state of the gasket shown in FIG.

FIG. 3 is a view showing a modified example of the gasket shown in FIG.

FIG. 4 is a view showing another modified example of the gasket shown in FIG.

FIG. 5 is a diagram showing a conventional example.

[Explanation of symbols]

 1, 31, 51 ... Gasket 2 ... Metal ring 3 ... Standing part 4 ... Extension part 5, 35, 55 ... Elastic body 5a ... Beat part 5b ... Tapered part 6 ... Seal part 7, 9 ... Cylinder tube 8 ... Cover 10 ... Head cover 11 ... Bottom cover 12 ... Bolt 13 ... Mounting part 14, 22 ... O-ring 15 ... Chamfer part 8a, 16, 17 ... Fitting part 16a ...... Mounting groove 18 ...... Rod 19 ...... Cushion seal 20 ...... Piston seal 21 ...... Rod seal 23 ...... Piston

Claims (3)

[Scope of utility model registration request] 1. A gasket which seals between a cylinder tube (7) and a cover (8) which closes an opening of the cylinder tube (7) to seal the two, and one end of which is inward. A metal ring (2) having an L-shaped cross section, which extends to the outside to form an extended portion (4), and has the other end standing upright in the axial direction to form an upstanding portion (3). An elastic body (5) is adhered to the surface of (4) to form a seal portion (6), and the seal portion (6) is provided between the opening end surface of the cylinder tube (7) and the cover (8). Gasket characterized by sealing. 2. The gasket according to claim 1, wherein an annular beat portion (5a) is formed on an end surface of the seal portion (6). 3. The gasket according to claim 1, wherein a taper portion (5b) is formed at a tip portion of the seal portion (6).