JP3268711B2 - Sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used for a rotary shaft sealing portion, and more particularly to a sealing device provided with a slinger on the atmosphere side of a seal body.

[0002]

2. Description of the Related Art As a conventional sealing device of this type, for example, there is one as shown in FIG. That is, the seal body 102 is provided between the housing 105 and the rotary shaft 107, and the slinger 110 is disposed on the atmosphere side of the seal body 102.

[0003] The slinger 110 has an inner diameter end on the rotating shaft 1.
07 and co-rotates with the rotating shaft 110, and is disposed such that the free end on the outer diameter side faces the end surface of the housing 105 with a predetermined axial gap in the axial direction.

In particular, in this conventional example, the outer diameter end of the slinger 110 is bent toward the fluid to be sealed to cover the outer periphery of the housing 105, and the annular bent portion 110a and the housing 105 are bent.
A radial gap is formed between the seal body 102 and the outer peripheral surface of the seal body 102 to form a labyrinth portion 111 together with the axial gap to prevent dust from entering the sliding surface of the seal body 102.

[0005]

However, in the above-mentioned conventional sealing device, the labyrinth portion 111 makes it difficult for dust to enter, but the slinger 1
Dust, muddy water, and the like that have entered the space between the seal 10 and the seal body 102 tend to stay in the space, and dust and mud may stick.

The slinger 110 and the seal body 102
There is also a problem that heat is likely to be trapped in the space between the seals and the seal portion becomes hot.

As a solution to such a problem, as shown in FIG. 3 (b), a slinger 101 is straight without a bent portion at the outer diameter end, and a fin 103 is further provided at the outer diameter end. There is a known type in which dust, muddy water and the like are shaken off by centrifugal force.

In this way, it is possible to prevent the accumulation of dust and the like between the slinger 101 and the seal body 102, and it is also possible to expect an air cooling effect of cooling the sliding heat of the seal body 102 by the flow of air due to centrifugal force.

However, this straight type has no labyrinth function, and the slinger 101 and the seal body 10
Since the gap between the two is open in the radial direction, there has been a problem that dust and muddy water and the like easily invade.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sealing device with a slinger having both a labyrinth function and a swing-off function by centrifugal force. It is in.

[0011]

In order to achieve the above object, according to the present invention, there is provided a seal body mounted between a shaft hole of a housing and a rotating shaft, and an end face of the housing on the atmosphere side of the seal body. And a slinger whose inner diameter end is fixed to the rotating shaft at a predetermined interval in the axial direction, wherein the slinger has a fluid side to be sealed facing the outer periphery of the housing at a predetermined interval. outside the folded portion provided with and divided in the circumferential direction, provided several notches in the free circumferential portion of the outer bent portion of the slinger, the notch inner diameter side end edge which is bent toward the And an inner bent portion extending toward the fluid to be sealed so as to face the inner periphery of the housing at a predetermined interval.

The seal body is provided with a dust lip slidably and sealingly contacting the slinger.

The slinger fixed to the rotating shaft is integrally provided with a sleeve portion in which the seal body is slidably and sealingly contacted.

[0014]

According to the present invention, the outer bent portion and the inner bent portion are discontinuous in the circumferential direction when stationary, but have an apparently continuous surface when rotating. Therefore, an apparent labyrinth portion is formed between the outer peripheral surface of the housing and the rotating surface of the outer bent portion, the inner peripheral surface of the housing and the rotating surface of the inner bent portion, and furthermore, an apparent labyrinth portion is formed between the housing end surface and the notched rotating surface. It can prevent infiltration of muddy water and the like.

[0015] Further, by adopting the notch form, the air cooling effect and the discharge of intrusion dust and muddy water are promoted by the flow of air by centrifugal force generated on the side of the notch in any rotational direction. .

Further, when the dust lip of the seal body is in sealing contact with the slinger, the durability of the dust lip can be improved.

In addition, if the sleeve portion is integrated, the jig and the like can be engaged with the seal body through the notch, so that the mounting operation can be performed while maintaining the optimum positional relationship between the seal body and the slinger. Can be. In particular, when the dust lip is brought into contact with the slinger, the contact allowance of dust can be accurately defined.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 shows a sealing device according to an embodiment of the present invention. The sealing device comprises a seal body 2 and a slinger 1 disposed on the atmosphere side of the seal body 2. I have.

The seal body 2 is mounted between the shaft hole 51 of the housing 5 and the rotating shaft 7.
1, a main seal lip 23 made of a rubber-like elastic body and slidably in contact with the outer periphery of the rotating shaft 7 integrally baked on the inner diameter end of the metal ring 21; A dust lip 25 which is arranged on the atmosphere side of the slidable member 23 and slidably contacts the rotary shaft 7;
5 and an end face dust lip 24 slidably and sealingly contacting the slinger 1. On the back surface of the main seal lip 23, a spring member 26 for applying a tension is mounted.

The metal ring 21 has an outer cylindrical portion 211 fitted on the inner periphery of the shaft hole 51 of the housing 5, and extends radially outward from the atmospheric end of the outer cylindrical portion to extend to the end surface of the housing 5. An annular flange portion 212 in contact with the inner cylinder portion 214 that is folded back from the end of the outer cylinder portion 211 on the side of the fluid to be sealed via the bent portion 213; Inward flange 21 extending toward
5, the main seal lip 23,
The dust lip 25 and the end face dust lip 24 are joined to the inward flange portion 215. The metal ring 21
A rubber-like elastic body 22 is coated on the side surface of the fluid side O to be sealed.

On the other hand, the slinger 1 has a stepped washer shape in which the inner diameter end is fixed to the rotating shaft, and has a first end face portion 12 facing the end face of the housing 5, and is located inside the first end face portion 12. And a second end surface portion 14 with which the dust lip 24 comes into sliding contact. The second end face 14 protrudes more toward the atmosphere in the axial direction than the first end face 12, and the first end face 1
The boundary between the second end face portion 14 and the second end face portion 14 is connected by the first cylindrical portion 13. A second cylindrical portion 15 extends from the inner diameter end of the second end surface portion 14 toward the fluid O to be sealed in the axial direction, and the second cylindrical portion 15 is fitted and fixed to the outer periphery of the rotating shaft 7.

The outer diameter end of the slinger 1, that is, the outer diameter end of the first end face portion 12 in this embodiment, is bent toward the fluid O to be sealed so as to face the outer periphery of the housing 5 at a predetermined interval. A notch 1 provided with an outer bent portion 11 to be bent and further extending radially inward from an outer diameter end;
7 are provided in the circumferential direction. The side of each notch 17 is formed radially from the center of the slinger.

At the inner end of each notch 17, the housing 5
An inner bent portion 16 extending toward the fluid side 0 to be sealed is provided so as to face the inner periphery of the fluid at a predetermined interval.

In the sealing device having the above configuration, the outer bent portion 11 and the inner bent portion 16 are discontinuous in the circumferential direction when stationary, but have the same apparent shielding effect as the continuous surface when rotating. I do. Therefore, the outer peripheral surface 52 of the housing 5 and the rotating surface of the outer bent portion 11, the inner peripheral surface of the housing 5 and the rotating surface of the inner bent portion 16, and the end surface of the housing 5 and the rotating surface of the notch 17 are apparent. The labyrinth portion 20 is configured to prevent intrusion of dust and muddy water.

Further, the provision of the notch 17 facilitates the air cooling effect and the discharge of intrusion dust and muddy water due to the flow of air due to the centrifugal force generated on the side of the notch 17 in either the right or left rotation direction. You. That is, when rotated clockwise in the drawing (in the direction of the solid arrow), centrifugal force generates an airflow along the side located in the rear of the rotation direction, and when rotated counterclockwise in the drawing (in the direction of the broken arrow), the air flows in the opposite direction. An airflow is generated along the side of.

FIG. 2 shows a sealing device according to another embodiment of the present invention.

In the second embodiment, a sleeve portion 18 with which the main seal lip 23 of the seal body 2 is slidably provided is integrally provided at the inner diameter end of the slinger 1. Other configurations and operations are the same as those of the above-described embodiment, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

As described above, if the sleeve portion 18 is integrated, the seal body 2 and the slinger 1 can be integrated and incorporated into the housing 5 as one component, and the assembling work becomes easy.

In particular, when the assembling jig 4 designed to push the flange portion 212 of the seal body 2 from the notch 17 of the slinger 1 at the time of assembling, the seal body 2 is used.
The slinger 1 can be fitted with the sealing device while maintaining the optimum positional relationship.

The mounting jig 4 has a slinger contact portion 41 for pressing the second end surface portion 14 of the slinger 1 and a seal body contact portion 42 for contacting the flange portion 212 through the notch 17. The slinger contact portion 41 and the seal body contact portion 42 are simultaneously brought into contact with the second end face portion 14 of the slinger 1 and the flange portion 212 of the seal body 2 respectively, and if they are pushed in, the contact margin of the end face dust lip 24 is appropriate. Can be set to a value.

[0032]

As described above, according to the present invention,
The slinger has an outer bent portion and a notch to form an inner bent portion, so the outer bent portion and the inner bent portion are discontinuous in the circumferential direction when stationary, but apparently continuous when rotating. With the same shielding effect as the surface, an apparent labyrinth part is formed between the end face of the housing and the inner and outer circumferences,
Intrusion of dust and muddy water can be effectively prevented, and dust resistance can be improved.

In addition, by adopting the notch form, the air cooling effect and the discharge of intrusion dust and muddy water are promoted by the flow of air due to the centrifugal force generated at the edge of the notch in any rotational direction, and the labyrinth effect is improved. Together, the dust resistance can be further improved.

Further, when the dust lip of the seal body is in sealing contact with the slinger, the durability of the dust lip can be improved.

In addition, if the sleeve portion is integrated, the jig and the like can be engaged with the seal body through the notch, so that the mounting operation can be performed while maintaining the optimum positional relationship between the seal body and the slinger. Can be.

In particular, when the dust lip is brought into contact with the slinger, the contact allowance of dust can be accurately defined.

[Brief description of the drawings]

1A is a sectional view of a main part of a sealing device according to an embodiment of the present invention, FIG. 1B is a half sectional view of a slinger, and FIG.
FIG. 3 is a half plan view of a slinger.

FIG. 2 is a sectional view of a main part of a sealing device according to another embodiment of the present invention.

3 (a) and 3 (b) are cross-sectional views of main parts of a conventional sealing device.

[Explanation of symbols]

 Reference Signs List 1 slinger 11 outer bent portion 12 first end surface portion 13 first cylindrical portion 14 second end surface portion 15 second cylindrical portion 16 inner bent portion 17 notch 18 sleeve portion 20 labyrinth portion 2 seal body 21 metal ring 211 outer tube Part 212 flange part 213 bent part 214 inner cylinder part 215 inward flange part 22 rubber-like elastic body 23 main seal lip 24 end face dust lip 25 dust lip 26 spring member 4 assembly jig 41 slinger contact part 42 seal body contact Part 5 Housing 51 Shaft hole 52 Outer circumference part 7 Rotation axis O Sealed fluid side A Atmosphere side

Claims (3)

(57) [Claims] 1. A seal main body mounted between a shaft hole of a housing and a rotary shaft, and an inner end fixed to the rotary shaft at a predetermined distance in an axial direction from an end face of the housing on an atmosphere side of the seal main body. that the sealing device comprising a slinger, and the slinger, to divide the outer folding section in the circumferential direction is bent toward the sealed fluid side so as to face with the outer circumference a predetermined distance in the housing provided with a notch in the free circumferential portion of the outer bent portion of the slinger is provided several, said the notch inner diameter side end edge, sealed fluid side so as to face each other with the inner periphery and the predetermined distance in the housing A sealing device provided with an inner bent portion extending toward the first member. 2. The sealing device according to claim 1, wherein the seal body is provided with a dust lip slidably and sealingly contacting the slinger. 3. A slinger fixed to a rotating shaft is provided integrally with a sleeve portion with which a seal body is slidably and sealingly contacted at an inner diameter end of the slinger. Sealing device.