JP2012087814A - Hermetically sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetically sealing device capable of effectively inhibiting entry of muddy water or dust from the outside, even though the device is used for a long period of time in a shaft sealing part such as an agricultural machine or a building machine, in a severe outer environment (atmospheric side) such as muddy water, in a limited space.SOLUTION: The hermetically sealing device is constituted of a reinforcing ring and a sleeve member. In the device, the sleeve member has: an outside cylindrical part from an end of a flange to the flange having a gap with an inner peripheral surface of the cylindrical part; and a first dust seal lip of a rubber-like elastic material extending outward from the outer peripheral surface of the outside cylindrical part in a radial direction, and also coming into slide contact with the inner peripheral surface of the cylindrical part. The lip has a second dust seal lip extending inward from outside in a radial direction, and coming into slide contact with the inner peripheral surface of the outside cylindrical part.

Description

  The present invention is used, for example, in shaft seals of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) such as muddy water is severe, and prevents intrusion of muddy water and dust from the outside, and also prevents leakage of internal seal objects. The present invention relates to a sealing device.

Conventionally, this type of sealing device has a structure shown in FIG. (Patent Document 1)
That is, a sealing device that seals a gap between the housing 100 and the rotary shaft 200 extending through the housing 100, and includes a seal member 300 held on the housing 100 side and a metal held on the rotary shaft 200 side. And a sleeve member 400 made of a material.

The sleeve member 400 includes an inner cylindrical portion 410 that is fitted to the outer peripheral surface of the rotary shaft 200, and a flange portion 420 that extends radially outward from one axial end (right end in the drawing) of the inner cylindrical portion 410. ing.
Further, the seal member 300 includes a metal-made reinforcing ring 310 including a cylindrical portion 3110 fitted into the housing 100 and a flange-shaped portion 3120 extending radially inward from one axial end of the cylindrical portion 3110. And a lip portion 320 made of a rubber-like elastic material formed integrally with the flange portion 3120.

The lip portion 320 extends toward the inside A side, and also has a main lip 3210 that slidably contacts the outer peripheral surface of the inner cylindrical portion 410, and an end surface lip 3220 that extends diametrically outward and slidably contact the flange portion 420. And.
Further, the gap between the radial end portion of the flange portion 420 and the inner peripheral surface of the cylindrical portion 3110 constitutes a labyrinth gap X that is a narrow gap.

However, this type of sealing device, when used for a long time in shaft seals of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) such as muddy water is severe, allows the entry of muddy water and dust from the outside. Evoked.
Therefore, an attempt was made to increase the muddy water resistance by adding another seal member, but since there is a limit to the installation space, the addition of a new seal member prevents the entry of muddy water and dust from the outside. It was difficult to improve the performance.

Japanese Utility Model Publication No. 6-87781

  Therefore, in view of the above-mentioned situation, the present invention is not limited to muddy water from the outside even if it is used for a long time in a shaft seal part of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) is difficult in a limited space. It is an object to provide a sealing device that can effectively prevent the intrusion of dust and dust.

In order to achieve the above object, the present invention provides a sealing device for sealing a gap between a housing and a rotary shaft extending through the housing, the sealing member held on the housing side, A sleeve member made of a metal material held on the rotating shaft side, the sleeve member being configured to be fitted in an outer peripheral surface of the rotating shaft, and a radial direction from one axial end of the inner cylindrical portion The reinforcing member is made of a metal material including a flange portion extending outward, and the seal member includes a cylindrical portion fitted into the housing and a flange portion extending radially inward from one axial end of the cylindrical portion. A main lip that is formed of a ring and a lip portion made of a rubber-like elastic material integrally formed with the hook-shaped portion, the lip portion extending toward the inner side and in sliding contact with the outer peripheral surface of the inner cylindrical portion; , Radially outward With extended I, in a more composed sealing device and the flange portion and the sliding contact end face lip,
The sleeve member has a gap with an inner peripheral surface of the tubular portion from an end portion of the flange portion, and extends radially toward the outer cylindrical portion extending toward the flange portion and the outer peripheral surface of the outer cylindrical portion. A first dust seal lip portion made of a rubber-like elastic material that extends outward and slidably contacts the inner peripheral surface of the cylindrical portion, and the lip portion is radially outward. And having a second dust seal lip portion that extends toward the inner side and slidably contacts the inner peripheral surface of the outer cylindrical portion.

The present invention has the following effects.
According to the sealing device of the first aspect of the present invention, even in a limited space, even if it is used for a long time on a shaft seal part of agricultural machinery, construction machinery, etc., where the environment (atmosphere side) such as muddy water is severe, from the outside Can effectively prevent the intrusion of muddy water and dust.
According to the sealing device of the second aspect of the present invention, it is possible to secure the mounting space for the first dust seal lip while maintaining the fitting force and the sealing performance between the seal member and the housing.

Furthermore, according to the sealing device of the invention described in claim 3, it is possible to more reliably prevent the entry of muddy water and dust from the outside.
Moreover, according to the sealing device of the invention described in claim 4, in order to effectively prevent intrusion of muddy water and dust into the inside, it is possible to prevent damage to the main lip and effectively prevent leakage of the internal seal object. .

  Further, according to the sealing device of the invention described in claim 5, since the entry of muddy water and dust into the lip portion side is effectively prevented, the sealing performance of the lip portion can be maintained for a long time.

Sectional drawing of the sealing device which concerns on 1st Embodiment. Sectional drawing of the sealing device which concerns on 2nd Embodiment. Sectional drawing of the sealing device which concerns on a prior art.

Hereinafter, the best mode for carrying out the present invention will be described.
An embodiment for carrying out the invention will be described with reference to FIG.

The sealing device according to the present invention is a sealing device that seals a gap between the housing 1 and the rotary shaft 2 extending through the housing 1.
And this sealing device is comprised by the sealing member 3 hold | maintained at the housing 1 side, and the sleeve member 4 made from a metal material hold | maintained at the rotating shaft 2 side.

The sleeve member 4 includes an inner cylindrical portion 41 fitted to the outer peripheral surface of the rotary shaft 2 and a flange portion 42 extending radially outward from one axial end (the right end in the drawing) of the inner cylindrical portion 41. .
The seal member 3 is made of a metal material including a cylindrical portion 311 fitted into the housing 1 and a flange-shaped portion 312 extending radially inward from one axial end (left end in the figure) of the cylindrical portion 311. A reinforcing ring 31 and a lip portion 32 made of a rubber-like elastic material formed integrally with the flange-like portion 312 are provided.
The lip portion 32 extends toward the inside A side (left side in the drawing), the main lip 321 slidably in contact with the outer peripheral surface of the inner cylindrical portion 41, the lip portion 32 extends toward the radially outer side, and slides with the flange portion 42. And an end face lip 322 in contact therewith.

  Further, the sleeve member 4 has an outer cylindrical portion 43 extending from the radial end portion (upper side in the drawing) of the flange portion 42 to the inner peripheral surface of the cylindrical portion 311 and extending toward the flange portion 312; A rubber-like elastic material that extends radially outward (upper side in the figure) from the outer peripheral surface of the outer cylindrical part 43 toward the outer B side (right end in the figure) and that is in sliding contact with the inner peripheral surface of the cylindrical part 311 And a first dust seal lip 323 made of a metal.

Further, the lip portion 32 has a second dust seal lip portion 324 that is radially outward and extends toward the inside A side and is in sliding contact with the inner peripheral surface of the outer cylindrical portion 43.
In this way, in addition to the conventional lip portion, the first dust seal lip portion 323 and the second dust seal lip portion 324 can be added to the limited space (space). Even if used for a long time in shaft seals of agricultural machinery, construction machinery, etc., where the environment on the atmosphere side is severe, it is possible to effectively prevent intrusion of muddy water and dust from outside.

Furthermore, the lip portion 32 has auxiliary lips 326 and 327 that are radially inward and extend toward the outer side B and are in sliding contact with the outer peripheral surface of the cylindrical portion 311.
For this reason, since these auxiliary lips 326 and 327 effectively prevent intrusion of muddy water and dust into the inside, it is possible to prevent damage to the main lip 321 and effectively prevent leakage of the internal seal object.

Further, the outer peripheral surface of the cylindrical portion 311 is formed by a rubber fitting layer 3111 formed by a part of the rubber-like elastic material constituting the lip portion 32 and a metal fitting layer 3112 where no rubber-like elastic material exists. ing.
For this reason, the cylindrical portion 311 maintains a fitting force and a sealing property between the sealing member and the housing, and a rubber fitting is provided in the region of the cylindrical portion 311 where the first dust seal lip 323 is formed. Since the composite layer 3111 does not exist and the radial thickness of the cylindrical portion 311 in this region can be made thinner than the others, a mounting space for the first dust seal lip 323 can be secured.

The gap between the outer peripheral surface in the axial direction of the outer cylindrical portion 43 and the inner peripheral surface of the cylindrical portion 311 forms a labyrinth gap X.
For this reason, the sealing performance of the lip part 32 can be maintained for a long period of time in order to effectively prevent muddy water and dust from entering the lip part 32 side.

A garter spring 3211 that presses the main lip 321 against the outer peripheral surface of the inner cylindrical portion 41 is disposed on the outer peripheral side of the main lip 321.
As a result, a good tension of the main lip 321 can be maintained for a long time.

A rubber-like elastic material layer is formed on the inner peripheral surface of the inner cylindrical portion 41.
By this, the favorable sealing performance between the inner cylindrical part 41 and the rotating shaft 2 can be maintained.
A rubber-like elastic material layer is also formed on the outside B side of the collar portion 42.
By this, it can prevent that the collar part 42 is corroded by muddy water etc.

Next, the sealing device according to the second embodiment will be described with reference to FIG.
The difference from the first embodiment described above is that the cylindrical portion 311 includes a flange portion 313 that extends radially outward (upward in the drawing) from the end portion (right end in the drawing) of the cylindrical portion 311, and the sleeve. A third dust seal lip portion 325 made of a rubber-like elastic material that extends radially outward from the member 4 side and slidably contacts the flange portion 313 is provided.
By this, compared with 1st Embodiment, it can be set as the sealing device which prevents intrusion of muddy water and dust from the exterior more reliably.

  It is suitably used as a sealing device for sealing a shaft seal portion of a tiller, construction machine or the like that is used under severe conditions such as muddy water on the atmosphere side.

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Housing 2 Shaft 3 Seal member 4 Sleeve member 31 Reinforcement ring 32 Lip part 41 Inner cylindrical part 42 Ridge part 43 Outer cylindrical part 311 Cylindrical part 312 Rigid part 313 Flange part 321 Main lip 322 End face lip 323 First dust lip 324 Second Dustrip 325 Third Dustrip 326 Auxiliary Lip 327 Auxiliary Lip

Claims (5)

A sealing device for sealing a gap between a housing (1) and a rotating shaft (2) extending through the housing (1), the sealing member (3) held on the housing (1) side; An inner cylindrical portion that is configured by a metal-made sleeve member (4) held on the rotating shaft (2) side, and the sleeve member (4) is fitted to the outer peripheral surface of the rotating shaft (2). (41) and a flange portion (42) extending radially outward from one axial end of the inner cylindrical portion (41), and the seal member (3) is a cylinder fitted to the housing (1) A reinforcing ring (31) made of a metal material including a ring-shaped portion (311), a flange-shaped portion (312) extending radially inward from one axial end of the cylindrical portion (311), and the flange-shaped portion (312) And a lip portion (32) made of a rubber-like elastic material integrally formed with The top portion (32) extends toward the inner side (A), the main lip (321) that is in sliding contact with the outer peripheral surface of the inner cylindrical portion (41), and the radial direction outer side. In the sealing device comprising the end lip (322) in sliding contact with the portion (42),
The sleeve member (4) has an outer cylindrical portion extending from the end portion of the flange portion (42) toward the flange portion (312) with a gap from the inner peripheral surface of the cylindrical portion (311). (43) and a rubber-like shape that is radially outward from the outer peripheral surface of the outer cylindrical portion (43), extends toward the outer (B) side, and slidably contacts the inner peripheral surface of the cylindrical portion (311). A first dust seal lip portion (323) made of an elastic material, and the lip portion (32) is radially outward and extends toward the inner (A) side, and the outer cylindrical portion (43). ) A sealing device having a second dust seal lip portion (324) in sliding contact with the inner peripheral surface.   The outer peripheral surface of the cylindrical part (311) has a rubber fitting layer (3111) formed by a part of the rubber-like elastic material constituting the lip part (32) and a metal fitting without the rubber-like elastic material. The sealing device according to claim 1, wherein the first dust seal lip portion (323) is in sliding contact with the inner peripheral surface of the metal fitting layer (3112).   The tubular portion (311) includes a flange portion (313) extending radially outward from an end portion of the tubular portion (311), and extends radially outward from the sleeve member (4) side. The sealing device according to claim 1, further comprising a third dust seal lip portion (325) made of a rubber-like elastic material in sliding contact with the flange portion (313). The lip portion (32) has auxiliary lips (326) and (327) that are radially inward and extend toward the outside (B) side and are in sliding contact with the outer peripheral surface of the tubular portion (311). The sealing device according to any one of claims 1 to 3, wherein the sealing device is provided.   The gap between the outer peripheral surface in the axial direction of the outer cylindrical portion (43) and the inner peripheral surface of the cylindrical portion (311) forms a labyrinth gap (X). The sealing device according to any one of the above.

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