JPH0723865U - Sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the sealing performance against foreign matter from the external space and the sealing performance of the seal lip. [Structure] A partition wall made of a film 6 is formed between a sealing portion formed by a seal lip 9 of a seal body 5 and an external space B.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device such as an oil seal used in a shaft sealing portion of various devices.

[0002]

[Prior art]

 A conventional sealing device of this type is, for example, one shown in FIG. The sealing device 100 seals an annular gap between a housing 101 and a shaft 102, which are two members that are concentrically assembled with each other and are rotatable relative to each other.

The sealing device 100 includes a seal body 104 mounted in the housing 101 and a sleeve 103 attached to a shaft 102 as a mating member that moves relative to the seal body 104. ing.

The seal body 104 is provided with a seal lip 106 that slidably and slidably contacts the sleeve 103 to form a sealed portion for sealing the fluid on the sealed fluid side O. The seal lip 106 has a main lip 106A and a sub lip 106B.

Further, the sleeve 103 has a flange portion 105 that projects outward in the radial direction, while the seal body 104 has a minute gap with the tip of the flange portion 105 of the sleeve 103 and the assembly ring 107. Is installed. Further, the seal body 104 is provided with a bumper 108 for the flange portion 105 with a minute gap from the flange portion 105 of the sleeve 103.

As described above, since the minute gap is provided between the flange portion 105 of the sleeve 103 and the tip of the flange portion 105, and between the flange portion 105 and the bumper 108 of the seal body 104, the flange portion 105 and the Due to the labyrinth effect of the space between the ceiling 107 and the space between the flange portion 105 and the bumper 108, foreign matter from the atmosphere side B, which is the external space, is sealed.

FIG. 6 shows another conventional example. This sealing device 100A is different from the sealing device 100 of the first conventional example in that the side lip 110 slidably sealingly contacts the flange portion 105 instead of the bumper 108 with respect to the flange portion 105 of the sleeve 103 in the seal body 104. The space between the flange portion 105 and the assembly ring 107 and the side lip 110 slidably and sealingly contact the flange portion 105 to seal the foreign matter from the atmosphere side B. .

[0008]

[Problems to be solved by the device]

 However, in the case of the sealing device 100 of the first conventional example described above, the foreign matter from the atmosphere side B is protected from the labyrinth in the space between the flange portion 105 of the sleeve 103 and the assembly ring 107 and the space between the flange portion 105 and the bumper 108. Although it seals due to the effect, it does not generate sliding heat because it is non-contact, but it is inferior in sealing performance to foreign particles with a small particle size.

In the case of the second conventional sealing device 100A, the space between the flange portion 105 and the assembly ring 107 and the side lip 110 slidably sealingly contact the flange portion 105, so that the atmosphere side Although the foreign matter from B is sealed, sliding heat is generated due to the side lip 110 sliding on the flange portion 105, and the main lip 106A and the sub lip 106B of the seal lip 106 that come into sealing contact with the sleeve 103 are transferred to the lip lip 106A. This adversely affects the sealability of the seal lip 106. Moreover, since the side lip 108 applies a tightening force to the flange portion 105, there is a drawback that the torque becomes large.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The purpose of the present invention is to improve the sealing performance against foreign matter from the external space and the sealing performance of the seal lip. It is to provide a sealing device capable of achieving the above.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a seal body and a mating member that moves relative to the seal body, and the seal body is in slidable sealing contact with the mating member. In a sealing device having a seal lip for forming a sealing portion, a partition wall made of a film is formed between the sealing portion by the sealing lip and the external space.

[0012]

[Action]

 In the sealing device having the above structure, a partition wall is formed by a film between a seal lip that forms a sealed portion by slidingly and sealingly contacting a mating member provided on the seal body. Therefore, the partition wall can also seal foreign matter having a small particle size from the external space.

Further, since the partition wall is thin because it is formed of a film, it is possible to suppress sliding heat generation when the film slides on the seal body or the counterpart member to form the partition wall. Therefore, the seal lip is not adversely affected, and the sealability of the seal lip is not impaired.

Moreover, since the tension is not applied because it is thin, the torque can be suppressed.

[0015]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 shows a sealing device according to an embodiment of the present invention, 1 denotes a sealing device main body, and this sealing device 1 includes a housing 2 as two members which are concentrically and relatively rotatably assembled with each other. The ring-shaped gap with the shaft 3 is sealed.

The sealing device 1 is provided with a seal body 5 mounted in the housing 2 and a mating member 4 mounted on the shaft 3 that moves relative to the seal body 5, and the sealing device 1 is hermetically sealed. The fluid on the fluid side O is prevented from leaking to the atmosphere side B.

The mating member 4 is a sleeve 7 of a cylindrical member having an L-shaped cross section having an outward flange portion 72 protruding outward in the radial direction, an inner peripheral surface of the cylindrical portion 71 of the sleeve 7, and an outward flange. The cylindrical portion 71 of the sleeve 7 is fitted to the outer periphery of the shaft 3 through the rubber-like elastic body 73. It is attached by mating.

The seal body 5 is provided at a support ring 8 of a cylindrical member having an L-shaped cross section having an inward flange portion 81 protruding inward in the radial direction, and at an inner end of the inward flange portion 81 of the support ring 8. A sealing lip 9 made of a rubber-like elastic material for slidably sealingly contacting the outer peripheral surface of the cylindrical portion 71 of the sleeve 7 to form a sealing portion for sealing the fluid on the sealing fluid side O; The support ring 8 is composed of a rubber-like elastic body 11 integrally fixed to the end surface of the inward flange 81 of the support ring 8 on the atmosphere side and the outer peripheral surface of the cylinder 82. It is attached by being fitted to the inner circumference of the housing 2 via the elastic body 11.

The seal lip 9 is continuously formed with the rubber-like elastic body 11, extends from the inner end of the inward flange portion 81 of the support ring 8 to the axial sealing fluid side O, and has a wedge-shaped tip. It comprises a main lip 91 and a sub-lip 92 extending from the inner end of the inward flange portion 81 toward the atmosphere side B in the axial direction and inclined toward the cylindrical portion 71 side of the sleeve 7. On the outer peripheral side of the main lip 91, a spring 12 for applying a tightening force to the cylindrical portion 71 of the sleeve 7 is attached.

Further, the bumper 10 is provided so as to protrude from the rubber-like elastic body 11 fixed to the inward flange portion 81 of the support ring 8.

An assembly ring 13 is attached to the outer periphery of the seal body 5. The assembly ring 13 is a stepped cylindrical member, and is formed of a small diameter small diameter cylindrical portion 13A and a large diameter large diameter cylindrical portion 13B. Further, the small-diameter cylindrical portion 13A has an inward flange portion 13C protruding inward in the radial direction. The cylindrical portion 13D of the small-diameter cylindrical portion 13A is an outward flange of the sleeve 7 when the large-diameter cylindrical portion 13B is attached to the outer periphery of the cylindrical portion 82 of the support ring 8 of the seal body 5 via the rubber-like elastic body 11. The rubber-like elastic body 73 fixed to the tip portion of the portion 72 has a minute gap, and the tip of the inward flange portion 13C is separated from the rubber-like elastic body 73 fixed to the outward flange portion 72 of the sleeve 7. It is arranged with a minute gap from the outer peripheral surface of the protruding portion 74 protruding to the atmosphere side B.

On the other hand, at the corner of the tip of the outward flange 72 of the sleeve 7 on the atmosphere side B, a film 6 is formed to project radially outward from the rubber-like elastic body 73. The thickness of this film 6 is preferably 0.05 to 0.10 mm.

Here, a method of manufacturing the film 6 will be described. As shown in FIG. 2, the film 6 is formed by a forming die 20 including a lower die 21 and an upper die 22 for forming a rubber-like elastic body 73 on the sleeve 7. That is, in the forming die 200 including the lower die 201 and the upper die 202 for forming the rubber-like elastic body 109 on the sleeve 105 in the prior art shown in FIG. 7, a small modification such as forming a groove or the like in the parting portion 23. It can be formed by manufacturing. That is, when molding the rubber-like elastic body 109 in the prior art, the structure of the molding die 200 should be taken into consideration so that burrs (unnecessary gum) appearing on the split surface (see arrow C) of the molding die 200 do not appear. However, if burr appeared, it was necessary to add one step and remove the burr. Therefore, in this manufacturing method, burrs appearing on the split surface of the molding die 20 are used. Therefore, it is no longer necessary to consider the molded structure or remove the burr by adding one step as in the conventional technique.

The film 6 formed as described above (see FIG. 1C) is the cylindrical portion of the small diameter cylindrical member 13A of the assembly ring 13 attached to the seal body 5 when the mating member 4 is attached. The inner peripheral surface of 13D bends toward the seal body 5 side and is slidably in sealed contact (see FIG. 1 (b)). By thus making sealing contact, a partition wall is formed between the sealing portion of the seal body 5 by the seal lip 9 and the atmosphere side B which is the external space.

In the sealing device having the above-described configuration, the labyrinth effect of the space between the outward flange portion 72 of the sleeve 7 and the bumper 10 of the seal body 5 shields foreign matter from the atmosphere side B, and By forming a partition wall of the film 6 between the seal lip 9 and the atmosphere side B, it is possible to seal even foreign matters having a small particle size from the atmosphere side B. Therefore, the sealing performance against foreign matter from the external space is improved as compared with the prior art.

Further, the film 6 slides on the inner peripheral surface of the cylindrical portion 13D of the small-diameter cylindrical member 13A of the assembly ring 13, but the film 6 is thin and can suppress sliding heat generation. Therefore, the main lip 91 and the sub lip 92 of the seal lip 9 are not adversely affected, and the sealing property of the seal lip 9 is not impaired.

Further, since the thin film 6 does not apply a tightening force to the cylindrical portion 13D, the torque can be suppressed.

FIG. 3 shows a sealing device according to a second embodiment of the present invention. The sealing device 1A includes a seal main body 32 mounted in the housing 2 and a mating member 30 mounted on the shaft 3 that moves relative to the seal main body 32. The fluid is prevented from leaking to the atmosphere side B.

The mating member 30 is a sleeve 31 of a cylindrical member having an L-shaped cross section, which has an outward flange portion 31 A that projects outward in the radial direction. The cylindrical portion 31 B of the sleeve 31 is fitted to the outer periphery of the shaft 3. It is attached by mating.

The seal main body 32 is provided at the support ring 33 of a cylindrical member having an L-shaped cross section having an inward flange portion 33 A protruding inward in the radial direction, and at the inner end of the inward flange portion 33 A of the support ring 33. A sealing lip 9A made of a rubber-like elastic material that forms a sealed portion for sealing the fluid on the sealing fluid side O by slidably sealingly contacting the outer peripheral surface of the cylindrical portion 31B of the sleeve 31 to be supported, The ring-shaped elastic member 9E is integrally fixed to the air-side end surface of the inward flange portion 33A of the ring 33 and the inner peripheral surface of the cylindrical portion 33B. It is attached by fitting it to the inner circumference of the.

The seal lip 9A is formed continuously with the rubber-like elastic body 9E, extends from the inner end of the inward flange portion 33A of the support ring 33 to the axial atmosphere side B, and has a wedge-shaped main end. It comprises a lip 9B and a sub-lip 9C extending from the inner end of the inward flange portion 33A to the axial sealing fluid side O and inclined toward the cylindrical portion 31B side of the sleeve 31. Further, the inward flange portion 33A is provided with a side lip 9D extending toward the outward flange portion 31A of the sleeve 31 and slidably sealingly contacting the end face of the outward flange portion 31A. A spring 12A for applying a tightening force to the cylindrical portion 31B of the sleeve 31 is attached to the outer peripheral side of the main lip 9C.

A partition wall is formed at a corner portion of the sleeve 31 of the main lip 9B on the side of the outward flange portion 31A between the sealing portion by the seal lip 9A and the atmosphere side B via the side lip 9D. The film 6A is formed.

The operation of the sealing device 1A configured as described above is the same as that of the first embodiment, and the description thereof is omitted.

FIG. 4 shows a sealing device 1B according to a third embodiment of the present invention. This sealing device 1B is the same as the sealing device 1A of the second embodiment, except that the sealing lip 9G is not provided with the spring 12A on the outer peripheral side of the main lip 9B. Since other configurations and operations are the same as those of the second embodiment, the same reference numerals are given to the same components and the description thereof will be omitted.

[0035]

[Effect of device]

 The present invention has the above-described structure and operation, and a film is provided between the seal lip that forms a sealed portion by slidably sealingly contacting the other side member provided in the seal body and the external space. Since the partition wall is formed, the partition wall can also seal foreign matter having a small particle size from the external space. Therefore, it is possible to improve the sealing performance against foreign matter from the external space.

Since the partition wall is thin because it is formed of a film, it is possible to suppress sliding heat generation when the film slides on the seal body or the counterpart member to form the partition wall. Does not adversely affect the seal lip. Therefore, the sealability of the seal lip may be impaired, so that the sealability of the seal lip can be improved as compared with the prior art.

Further, since the partition wall is thin and no tightening force is applied thereto, the torque can be suppressed.

[Brief description of drawings]

1A is a vertical cross-sectional view of a sealing device according to an embodiment of the present invention, FIG. 1B is an enlarged view of part A of FIG. 1A, and FIG. 4) is a vertical cross-sectional view of the film portion before assembly.

FIG. 2 is a longitudinal sectional view of an essential part showing a state where a rubber-like elastic body is molded on a sleeve.

FIG. 3 (a) is a vertical sectional view of a sealing device according to a second embodiment of the present invention, and FIG. 3 (b) is a vertical sectional view of a film portion before assembly.

FIG. 4 is a vertical cross-sectional view of a sealing device according to a third embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional sealing device.

FIG. 6 is a vertical cross-sectional view of another conventional sealing device.

FIG. 7 is a longitudinal sectional view of essential parts showing a state in which a rubber-like elastic body is molded on a sleeve in a conventional sealing device.

[Explanation of symbols]

 1, 1A, 1B Sealing device 2 Housing 3 Shaft 4,30 Counterpart member 5,32 Seal body 6,6A Film 7,31 Sleeve 71,31B Cylindrical part 72,31A Outward flange part 73 Rubber-like elastic body 74 Projection part 8,33 Support ring 81,33A Inward flange portion 82,33B Cylindrical portion 9,9A Seal lip 91,9B Main lip 92,9C Sub lip 9D Side lip 10 Bumper 11,9E Rubber-like elastic body 12,12A Spring 13 assembly Sealing 13A Small-diameter cylindrical part 13B Large-diameter cylindrical part 13C Inward flange part 13D Cylindrical part 20 Mold 21 Lower mold 22 Upper mold 23 Parting part

Claims (1)

[Scope of utility model registration request] 1. A seal body having a seal body and a mating member that moves relative to the seal body, the seal body having a seal lip slidably sealingly contacting the mating member to form a sealed portion. In the above sealing device, a partition wall made of a film is formed between the sealing portion formed by the seal lip and the external space.