JPH0680063U - Sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sealing device having a long sealing life by preventing muddy water, dust, etc. from being retained inside the sealing device, preventing wear of a seal lip. A sleeve 4 which is a first seal member which is assembled to an inner member, and a seal body 7 which is a second seal member which is assembled to an outer member.
Includes a cylindrical portion 13 and a flange portion 3 protruding radially from the end portion of the cylindrical portion 13 on the side opposite to the object to be sealed, and the seal body 7 is slidable on the outer periphery of the cylindrical portion 13 of the sleeve 4. A first seal lip 5 that is in contact with the second seal lip 6 that is in sliding contact with the flange portion 3 is provided, and the first seal lip 5 of the seal body 7 is gradually moved toward the opposite side of the axially sealed object. The base side taper part 16 which inclines and extends, and the lip side taper part 17 which was bent toward the axial direction sealing object side following the base side taper part 16 were comprised.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device used for a bearing portion in a severe location such as dust and muddy water such as a dust seal portion of an automobile hub bearing portion.

[0002]

[Prior art]

 As a conventional sealing device of this type, for example, one shown in FIG. 2 is known.

In FIG. 2, a gap is sealed between an inner race 101 and an outer race 102, which are concentrically assembled with each other in a bearing, and are fitted to the outer circumference of the inner race 101 and extend radially outward. A sleeve 104 having a flange portion 103, and a seal body 107 having a first lip 105 attached to the other outer race 102 and in close contact with the end surface of the flange portion 103, and a second lip 106 in close contact with the outer periphery of the sleeve 104. I have it.

The seal body 107 has a reinforcing ring 108 having an L-shaped cross section, and the outer periphery of the reinforcing ring 108 is closely fitted to the inner peripheral surface of the outer race 102. The first and second lips 105, 106 that are in close contact with the outer periphery of the sleeve 104 are rubber-like elastic bodies, and the second lip 106 extends from the inner end of the reinforcing ring 108 toward the atmosphere in the axial direction. The first lip 105 extends in a direction in which the diameter of the first lip 105 gradually increases from the axial end portion of the second lip 106 toward the atmosphere side in the axial direction, and the tip end thereof is in close contact with the end surface of the flange portion 103. A spring 109 that applies a tightening force to the second lip 106 is attached to the outer circumference of the second lip 106.

Further, in this embodiment, a third lip 110 is concentrically provided on the outer diameter side of the first lip 105. The third lip 110 has a taper shape that expands from the midway portion in the radial direction of the inward flange 111 extending inward in the radial direction of the reinforcing ring 108 toward the atmosphere side in the axial direction, and its tip is in close contact with the sealing mating surface of the flange portion 103. ing.

Further, a space 112 is formed between the third lip 110 and the reinforcing ring 108.

[0007]

[Problems to be solved by the device]

 However, in the above-described conventional sealing device, the space 112 is formed between the third lip 110 and the reinforcing ring 108, and dust and muddy water enter into this space 112, and the dust and muddy water that once enter the space 112 are Since the outlet is narrow, it remains and damages and wears the third lip 110, and further dust and muddy water enter the inside, damaging the first and second lips 105 and 106 as well.

The accumulation of the dust and muddy water in the space 112 impairs the function of the sealing device and shortens the life.

The present invention has been made to solve the above-mentioned problems of the prior art. The purpose of the present invention is to prevent muddy water, dust, etc. from being retained inside the sealing device and prevent wear of the seal lip. However, it is to provide a sealing device having a long sealing life.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention seals a gap between two members that are concentrically and relatively rotatably assembled with each other. The first member is an inner member of the two members. A seal member and a second seal member assembled to the outer member, wherein the first seal member is a cylindrical portion and a flange projecting radially from an end portion of the cylindrical portion on the side opposite to the object to be sealed. A second seal member, the second seal member includes a first seal lip slidably contacting an outer circumference of a cylindrical portion of the first seal member, and a second seal lip slidably contacting the flange portion. A root side taper portion extending gradually inclining toward the anti-sealing object side in the axial direction, and the first sealing lip of the second sealing member, and the axial sealing object following the root side taper portion. Lip tip bent to the side Characterized by being configured to have a tapered portion.

[0011]

[Action]

 In the sealing device configured as described above, the first seal lip of the second seal member is provided with a root-side taper portion that gradually extends toward the anti-sealing target side in the axial direction, and the root-side taper portion. Since it is configured to have a taper portion on the lip tip side that is bent toward the object to be sealed in the axial direction, dust and muddy water adhere to the taper portion on the root side or the taper portion on the lip tip side. But not retained.

[0012]

【Example】

 The present invention will be described below based on the illustrated embodiment.

FIG. 1 shows a sealing device according to an embodiment of the present invention.

In FIG. 1, it seals the gap between the inner race 1 and the outer race 2 of the bearing which are concentrically assembled with each other, and is fitted to the outer periphery of the inner race 1 to form a cylindrical portion 13 and its cylindrical portion. A sleeve 4 which is a first seal member having a flange portion 3 extending outward in the radial direction from the side of the object 13 opposite to the sealed object, and is attached to the other outer race 2 and slides on the cylindrical portion 13. A first seal lip 5 that freely contacts, a second seal lip 6 that slidably contacts the flange portion 3, and a reinforcement having an L-shaped cross-section integrated with these first and second seal lips. And a seal body 7 that is a second seal member having a ring 8.

The reinforcing ring 8 is composed of an outer ring portion 14 on the outer peripheral side of the seal body 7 and an inward flange portion 11 extending inward in the radial direction from the side of the object to be sealed of the outer ring portion 14. The outer periphery of the ring portion 14 is closely fitted to the inner peripheral surface of the outer race 2.

The first and second seal lips 5 and 6 slidably contacting the outer circumference of the sleeve 4 are rubber-like elastic bodies, and the first seal lip 5 extends from the tip of the inward flange 11 to the axial direction. The taper portion 16 on the base side which extends so as to gradually decrease in diameter toward the side opposite to the object to be sealed and the taper portion 16 at the base side are continuously bent in the axial direction as shown by the chain line. It has a lip tip side taper portion 17 and is in slidable contact with the cylindrical portion 13 in a state where it is further bent by a predetermined amount from the non-contact state shown by the one-dot chain line. In addition, the second seal lip 6 is axially anti-sealed from the object side of the base side taper portion 16 of the first seal lip 5 at the tip of the inward flange portion 11 as indicated by the one-dot chain line. The second lip tip portion 18 at the tip end of the second lip tip portion 18 abuts on the flange portion 3 and is bent toward the inner peripheral side so as to gradually become smaller in diameter toward the object side.

Further, in this embodiment, a plurality of fraying blades 19 are provided all around the surface of the root side taper portion 16 on the surface of the object to be sealed in the axial direction so that dust, muddy water, etc. can be easily frayed. There is. The fraying blade 19 may be a groove or any other blade as long as it is configured to easily dust off dust or muddy water.

Although the sleeve 4 which is the first seal member in this embodiment is formed in a substantially U-shaped cross section, the second seal member may be formed in another shape such as an L-shape. It is only necessary that the above-mentioned configuration is achieved with a certain seal body 7 and the same effect can be obtained.

With the above configuration, dust, muddy water, etc. adhere to the root side taper portion 16 and the lip tip side taper portion 17 of the first seal lip 5, which is the surface on the object side to be sealed, The attached dust and muddy water are pushed toward the outer diameter side by the action of centrifugal force, and are returned to the sealed object side. That is, even if dust or muddy water adheres, it is immediately returned to the sealed object side and is not retained. Therefore, dust and muddy water are not retained inside the sealing device, wear of the seal lip can be prevented, and a sealing device with a long seal life can be provided.

[0020]

[Effect of device]

 The present invention has the above-described configuration and operation, and has a root side taper portion that extends the first seal lip of the second seal member while gradually inclining toward the object side to be sealed in the axial direction, and the root side taper. Since it is configured to have a lip tip side taper part that is bent toward the object to be sealed in the axial direction, dust and muddy water adhere to the root side taper part or the lip tip side taper part. Even if it is subjected to centrifugal force, it will not be held because it is shaken off and returned to the side of the object to be sealed, so the seal body is less susceptible to damage from muddy water, dust, etc., and a sealing device with a long life is provided. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a sealing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional sealing device.

[Explanation of symbols]

 1,101 Inner Race 2,102 Outer Race 3,103 Flange Part 4,104 Sleeve (First Seal Member) 5 First Seal Lip 6 Second Seal Lip 7,107 Seal Body (Second Seal Member) 8 , 108 Reinforcement ring 11,111 Inward flange part 13 Cylindrical part 14 Outer ring part 16 Base side taper part 17 Lip tip side taper part 18 Second lip tip part 19 Flipping blade 105 First lip 106 Second lip 109 Spring 110 Third lip 112 space

Claims (1)

[Scope of utility model registration request] 1. A seal for sealing a gap between two members that are concentrically and relatively rotatably assembled to each other. A first seal member that is assembled to an inner member of the two members and an outer member that is assembled to the outer member. The second seal member is provided, and the first seal member includes a cylindrical portion and a flange portion projecting radially from an end portion of the cylindrical portion on the side opposite to the object to be sealed, The seal member includes a first seal lip that slidably contacts the outer periphery of the cylindrical portion of the first seal member, and a second seal lip that slidably contacts the flange portion, and the second seal member Of the first seal lip, the root side taper portion extending gradually inclining to the side opposite to the object to be sealed in the axial direction, and the tip of the lip bent toward the side of the object to be sealed in the axial direction following the root side taper portion. And a side taper portion Sealing device according to claim and.