阅读说明：本技术 密封装置 (Sealing device ) 是由 有泉学 于 2020-05-13 设计创作，主要内容包括：本发明提供一种能够进一步抑制在弹性体部的橡胶材料中产生贯穿龟裂的密封装置。密封装置(1)具备安装于外周侧部件(101)的密封装置主体(10)和安装于内周侧部件(102)的抛油环(40)。密封装置主体(10)具备：环形的加强环(20),以轴线(Y1)为中心；以及环形的弹性体部(30),由安装于加强环(20)的弹性体构成,并以轴线(Y1)为中心。在加强环(20)形成有用于贯穿加强环(20)的内部空间侧面与大气侧面的贯穿孔(24),在弹性体部(30)的内部空间侧面形成有用于固定硫化时的加强环(20)的位置的定位部(36)。密封装置(1)的贯穿孔(24)和定位部(36)被形成在径向上分离的位置。(The invention provides a sealing device which can further inhibit the generation of through cracks in a rubber material of an elastic body part. A sealing device (1) is provided with a sealing device body (10) attached to an outer peripheral member (101), and a slinger (40) attached to an inner peripheral member (102). The sealing device body (10) is provided with: an annular reinforcement ring (20) centered on an axis (Y1); and an annular elastic body part (30) which is composed of an elastic body attached to the reinforcing ring (20) and is centered on the axis (Y1). A through hole (24) for penetrating the side surface of the inner space of the reinforcing ring (20) and the side surface of the atmosphere is formed in the reinforcing ring (20), and a positioning portion (36) for fixing the position of the reinforcing ring (20) during vulcanization is formed in the side surface of the inner space of the elastic body portion (30). The through-hole (24) and the positioning portion (36) of the sealing device (1) are formed at positions separated in the radial direction.)

1. A sealing device that seals between an annular outer peripheral member and an annular inner peripheral member that are rotatable relative to each other on an axis, the inner peripheral member being an annular member at least a portion of which is surrounded by the outer peripheral member, the sealing device comprising:

a sealing device body attached to the outer peripheral member; and

a slinger attached to the inner peripheral member,

the sealing device main body is provided with:

an annular reinforcement ring centered on the axis; and

an annular elastic body portion formed of an elastic body attached to the reinforcing ring and centered on the axis,

a through hole is formed in the reinforcing ring, the through hole penetrating through an inner space side surface and an atmosphere side surface of the reinforcing ring,

a positioning portion for fixing the position of the reinforcing ring during vulcanization is formed on a side surface of the inner space of the elastic body portion,

the through-hole and the positioning portion are formed at positions separated in the radial direction.

2. The sealing device of claim 1,

the thickness of the elastic body portion formed on the atmosphere side of the reinforcement ring is larger than the thickness of the elastic body portion formed on the internal space side of the reinforcement ring.

3. Sealing device according to claim 1 or 2,

the positioning portion is an annular groove portion formed on the outer peripheral side and/or the inner peripheral side of the through-hole and recessed from the inner space side to the atmosphere side.

Technical Field

The present invention relates to a sealing device.

Background

Conventionally, a sealing device having a plurality of relatively rotatable members has been widely used. As such a sealing device, a sealing device having: a slinger fixed to one of two relatively rotatable members, for example, a rotary shaft; and a sealing device body fixed to the other of the two relatively rotatable members, for example, an inner peripheral side surface of a shaft hole of the housing (see, for example, patent document 1).

Such a sealing device is used for sealing a lubricant or the like in an internal space of a vehicle, a general-purpose machine, or the like. The slinger is provided with a flange which prevents or reduces the intrusion of mud and dust from the atmosphere side to the internal space side. Therefore, such a sealing device is used in an environment containing much mud and dust, such as a bogie of a railway vehicle, a bogie of a pallet, a balanced suspension of a construction machine or a truck, or an agricultural machine.

Prior art documents

Patent document

Patent document 1: japanese patent No. 4978074.

Disclosure of Invention

The sealing device body of such a sealing device includes an annular reinforcing ring and an elastic body portion made of a rubber material and integrally formed so as to cover the reinforcing ring. The elastic body portion is bonded to the reinforcing ring by cross-linking bonding, whereby the elastic body portion and the reinforcing ring are integrally formed.

Holes for improving the adhesion between the elastic body portion and the reinforcing ring may be provided at equal intervals in the reinforcing ring, and the holes may be filled with a rubber material. Here, when the hole of the reinforcement ring and the groove of the elastic body portion have a portion overlapping in the radial direction, cracks may be generated from a portion of the elastic body portion where the rubber material is thin due to swelling and contraction of the rubber material caused by adhesion of the solvent, and the cracks may be penetrated by the rubber material in the hole of the reinforcement ring. Therefore, a conventional sealing device is required to have a structure capable of further suppressing the occurrence of a through crack in the rubber material of the elastic body portion.

The present invention has been made in view of the above problems, and an object thereof is to provide a sealing device capable of further suppressing the occurrence of a penetration crack in a rubber material of an elastic body portion.

In order to achieve the above object, a sealing device according to the present invention is a sealing device for sealing between an annular outer peripheral member and an annular inner peripheral member at least partially surrounded by the outer peripheral member, the annular outer peripheral member being rotatable relative to the annular inner peripheral member on an axis, the sealing device including: a sealing device body attached to the outer peripheral member; and a slinger attached to the inner peripheral member, the sealing device body including: an annular reinforcement ring centered on the axis; and an annular elastic body portion formed of an elastic body attached to the reinforcing ring, the annular elastic body portion having a through hole formed in the reinforcing ring so as to penetrate between an inner space side surface of the reinforcing ring and an atmosphere side surface, the annular elastic body portion having a positioning portion formed in an inner space side surface thereof so as to fix a position of the reinforcing ring at the time of vulcanization, the through hole and the positioning portion being formed at positions separated in a radial direction.

In the sealing device according to one aspect of the present invention, the thickness of the elastic body portion formed on the atmosphere side of the reinforcing ring is larger than the thickness of the elastic body portion formed on the internal space side of the reinforcing ring.

In the sealing device according to one aspect of the present invention, the positioning portion is an annular groove portion that is formed on an outer peripheral side and/or an inner peripheral side of the through-hole and is recessed from an inner space side toward an atmosphere side.

According to the sealing device of the present invention, the occurrence of through cracks in the rubber material of the elastic body portion can be further suppressed.

Drawings

Fig. 1 is a sectional view for showing a schematic structure of a sealing device according to an embodiment of the present invention;

fig. 2 is an enlarged cross-sectional view for showing a schematic configuration of a through-hole and a vicinity of a positioning portion of a sealing device according to an embodiment of the present invention;

fig. 3 is a sectional view showing a schematic structure of a seal structure in a state where the sealing device according to the embodiment of the present invention is assembled to a sealing target.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a sectional view showing a schematic configuration of a sealing device 1 according to an embodiment of the present invention. Fig. 2 is an enlarged sectional view for showing a schematic structure of the through-hole 24 and the vicinity of the positioning portion 36 of the sealing device 1. In fig. 1, 2, only a single-sided portion of the sealing device 1 is shown. The sealing device 1 is used in an environment with a large amount of mud or dust, such as a bogie of a railway vehicle, a bogie of a pallet, a balanced suspension of a construction machine or a truck, or an agricultural machine (a cultivator, a tractor, a rice transplanter). The sealing device 1 serves to seal between an annular outer peripheral member and an annular inner peripheral member, which are relatively rotatable with respect to each other and at least partially surrounded by the outer peripheral member. Further, the object to which the sealing device 1 is applied is not limited to the above.

The sealing device 1 according to the embodiment of the present invention is a sealing device that seals between an annular outer peripheral member 101 that is rotatable relative to each other on an axis Y1 and an annular inner peripheral member 102 that is at least partially surrounded by the outer peripheral member 101. The sealing device 1 includes a sealing device body 10 attached to an outer peripheral member 101 and a slinger 40 attached to an inner peripheral member 102.

The sealing device body 10 includes: an annular reinforcing ring 20, centred on axis Y1; and an annular elastic body portion 30 made of an elastic body attached to the reinforcing ring 20 and centered on the axis Y1. A through hole 24 for passing through between the side surface of the inner space of the reinforcement ring 20 and the side surface of the atmosphere is formed in the reinforcement ring 20, and a positioning portion 36 for fixing the position of the reinforcement ring 20 at the time of vulcanization is formed in the side surface of the inner space of the elastic body portion 30. The through-hole 24 and the positioning portion 36 of the sealing device 1 are formed at positions separated in the radial direction. The structure of the sealing device 1 will be specifically described below.

In the following description, for convenience of explanation, one side (arrow a direction) of the direction of the axis Y1 (hereinafter, also referred to as the axis Y1 direction), which is the axis of the sealing device 1 in fig. 1 and 2, is referred to as an internal space side, and the other side (arrow b direction) is referred to as an atmosphere side. One side (arrow c direction) in a direction (hereinafter, also referred to as a radial direction) extending perpendicular to the axis Y1 of the sealing device 1 in fig. 1 and 2 is an inner peripheral side, and the other side (arrow d direction) is an outer peripheral side. In the following description, when the positional relationship and the direction of each member are described, the positional relationship and the direction in the drawings are always shown, and the positional relationship and the direction when the member is assembled to an actual vehicle or the like are not shown.

As shown in fig. 1, the outer shape of the sealing device 1 is formed in a ring shape or a substantially ring shape around the axis Y1, and a cylindrical or substantially cylindrical opening 2 is formed in the center portion thereof. The seal device 1 includes a seal device body 10 having a circular or substantially circular ring shape about an axis Y1, and a slinger 40 formed on an inner peripheral side of the seal device body 10 and having a cylindrical or substantially cylindrical shape about an axis Y1.

In the sealing device 1, the outer shape of the sealing device body 10 is formed in a circular ring shape or a substantially circular ring shape about the axis Y1. The sealing device body 10 includes a reinforcing ring 20 having a circular or substantially cylindrical shape about an axis Y1, and an elastic body portion 30 formed of an elastic body integrally molded with the reinforcing ring 20 and having a circular or substantially circular shape about an axis Y1.

The elastomer of the elastomer portion 30 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcing ring 20 is made of, for example, metal, and is manufactured by press working or forging, and the elastic body portion 30 is molded by cross-linking (vulcanization) molding using a molding die.

The reinforcement ring 20 has: a cylindrical portion 21; an annular inner peripheral flange 22 extending from an inner space side end portion, which is an end portion of the cylindrical portion 21 on the inner space side, toward the inner peripheral side; and an annular outer peripheral flange portion 23 extending from an atmosphere-side end portion, which is an end portion of the cylindrical portion 21 on the atmosphere side, toward the outer peripheral side. Specifically, the cylindrical portion 21 extends parallel or substantially parallel to the direction of the axis Y1, and is formed in a cylindrical shape or substantially cylindrical shape about the axis Y1. The end portion of the cylindrical portion 21 on the side of the internal space, the end portion on the side of the atmosphere, the inner peripheral side surface, and the outer peripheral side surface are buried in the elastic body portion 30.

The inner peripheral side flange portion 22 extends in parallel or substantially in parallel with the radial direction, extends from the end of the inner space of the cylindrical portion 21 toward the inner peripheral side, and is annular or substantially annular about the axis Y1. The inner peripheral side flange 22 has an inner space side surface, an atmosphere side surface, an inner peripheral side end portion, and an outer peripheral side end portion (an inner space side end portion of the cylindrical portion 21) embedded in the elastic body portion 30.

A through-hole 24 is formed in a radially central portion of the inner peripheral side flange portion 22, and the through-hole 24 is adapted to penetrate between the inner space side surface of the inner peripheral side flange portion 22 of the reinforcing ring 20 and the atmosphere side surface. The through-hole 24 is formed in a cylindrical shape or a substantially cylindrical shape, for example, and a plurality of (for example, 8) through-holes are formed at equal angular intervals or substantially equal angular intervals in a concentric circle or substantially concentric circle shape from the axis line Y1. The diameter of the through-hole 24 is, for example, 3mm, and the through-hole 24 is filled with the elastomer of the elastomer portion 30.

The outer peripheral flange portion 23 extends in parallel or substantially in parallel with the radial direction, extends from the atmosphere-side end of the cylindrical portion 21 to the outer peripheral side, and is annular or substantially annular about the axis Y1. The inner peripheral end (the air-side end of the cylindrical portion 21) and the air-side surface of the outer peripheral flange portion 23 are buried in the elastic body portion 30, and most of the outer peripheral end and the internal space-side surface are exposed from the elastic body portion 30.

The elastic body portion 30 includes an internal space-side elastic body portion 31, an atmosphere-side elastic body portion 32, a seal lip 33, and a dust lip 34. Specifically, the internal space-side elastic body portion 31 includes: an outer peripheral side portion 31d extending parallel or substantially parallel to the direction of the axis Y1 and formed in a cylindrical or substantially cylindrical shape about the axis Y1; and an inner space-side portion 31a extending in parallel or substantially in parallel with the radial direction, extending from the inner space-side end of the outer peripheral portion 31d toward the outer peripheral side, and having a circular ring shape or substantially circular ring shape about the axis Y1.

The internal space-side elastic body portion 31 covers the outer peripheral side surface of the cylindrical portion 21, the internal space-side end portion of the cylindrical portion 21 (the outer peripheral side end portion of the inner peripheral-side flange portion 22), and the internal space-side surface of the inner peripheral-side flange portion 22. The internal space-side elastic body portion 31 has an outer peripheral lip 35 extending from the outer peripheral portion 31d to the outer periphery and having a circular or substantially circular ring shape about the axis Y1.

The positioning portion 36 is formed on the inner space side portion 31a of the inner space side elastic body portion 31, and the positioning portion 36 fixes the position of the reinforcement ring 20 at the time of vulcanization. The positioning portion 36 is an annular groove portion recessed from the inner space side to the atmosphere side, which is formed on the outer peripheral side and/or the inner peripheral side of the through-hole 24. Specifically, the positioning portion 36 includes an inner circumferential positioning portion 36c and an outer circumferential positioning portion 36 d.

As shown in fig. 2, the inner circumferential positioning portion 36c is a groove portion that is recessed from the inner space side surface 31aa of the inner space side portion 31a of the inner space side elastic body portion 31 toward the inner space side surface of the inner circumferential side flange portion 22 of the reinforcing ring 20 on the inner circumferential side of the through-hole 24 and has a rectangular or substantially rectangular cross section. Further, the inner peripheral side positioning portion 36c is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis Y1.

The inner peripheral side positioning portion 36c has an annular or substantially annular bottom surface 36ct extending parallel or substantially parallel to the radial direction at a predetermined depth from the inner space side surface 31aa of the inner space side portion 31a of the inner peripheral side positioning portion 36c toward the atmosphere. The bottom surface 36ct is not formed on the inner space side surface of the inner peripheral side flange portion 22 of the reinforcing ring 20, but is defined as the boundary of the inner peripheral side positioning portion 36c on the atmosphere side.

An inner peripheral side surface 36cc is formed on the inner peripheral side of the bottom surface 36ct of the inner peripheral side positioning portion 36c, and an outer peripheral side surface 36cd is formed on the outer peripheral side of the bottom surface 36ct of the inner peripheral side positioning portion 36 c. An inner peripheral side surface 36cc of the inner peripheral side positioning portion 36c is a surface that defines an inner peripheral side boundary of the inner peripheral side positioning portion 36c, and an outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c is a surface that defines an outer peripheral side boundary of the inner peripheral side positioning portion 36 c.

The inner peripheral side surface 36cc of the inner peripheral side positioning portion 36c is a cylindrical or substantially cylindrical surface extending from the edge on the inner peripheral side of the bottom surface 36ct toward the internal space side with the axis Y1 as the center along the axis Y1 direction. The outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c is a cylindrical or substantially cylindrical surface extending from the outer peripheral side edge of the bottom surface 36ct toward the inner space side with the axis Y1 as the center along the direction of the axis Y1.

The outer circumferential positioning portion 36d is a groove portion recessed from the inner space side surface 31aa of the inner space side portion 31a of the inner space side elastic body portion 31 toward the inner space side surface of the inner circumferential side flange portion 22 of the reinforcing ring 20 on the outer circumferential side of the through-hole 24, and having a rectangular or substantially rectangular cross section. Further, the outer circumferential positioning portion 36d is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis Y1.

The outer circumferential positioning portion 36d has an annular or substantially annular bottom surface 36dt extending in parallel or substantially parallel to the radial direction at a predetermined depth from the inner space side surface 31aa of the inner space side portion 31a of the inner space side elastic body portion 31 toward the atmosphere side. The bottom surface 36dt does not reach the inner space side surface of the inner peripheral flange 22 of the reinforcing ring 20, but defines the boundary of the outer peripheral positioning portion 36d on the atmosphere side.

An inner peripheral side surface 36dc is formed on the inner peripheral side of the bottom surface 36dt of the outer peripheral side positioning portion 36d, and an outer peripheral side surface 36dd is formed on the outer peripheral side of the bottom surface 36dt of the outer peripheral side positioning portion 36 d. An inner peripheral side surface 36dc of the outer peripheral positioning portion 36d is a surface that divides the boundary on the inner peripheral side of the outer peripheral positioning portion 36d, and an outer peripheral side surface 36dd of the outer peripheral positioning portion 36d is a surface that divides the boundary on the outer peripheral side of the outer peripheral positioning portion 36 d.

The inner peripheral side surface 36dc of the outer peripheral side positioning portion 36d is a cylindrical or substantially cylindrical surface extending from the edge on the inner peripheral side of the bottom surface 36dt toward the internal space side with the axis Y1 as the center along the axis Y1 direction. The outer peripheral side surface 36dd of the outer peripheral side positioning portion 36d is a cylindrical or substantially cylindrical surface extending from the outer peripheral edge of the bottom surface 36dt toward the internal space side about the axis Y1 in the direction of the axis Y1.

Here, the through-hole 24 and the positioning portion 36 of the sealing device 1 are formed at positions separated in the radial direction. Specifically, the outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c is formed on the inner peripheral side of the peripheral surface of the through-hole 24, and the inner peripheral side surface 36dc of the outer peripheral side positioning portion 36d is formed on the outer peripheral side of the peripheral surface of the through-hole 24. That is, a predetermined width W1 is formed between the outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c and the peripheral surface of the through-hole 24, and a predetermined width W2 is formed between the inner peripheral side surface 36dc of the outer peripheral side positioning portion 36d and the peripheral surface of the through-hole 24. The entire bottom surfaces 36ct, 36dt of the inner-side positioning portions 36c and the outer-side positioning portions 36d face the inner space side surface 22a of the inner-side flange 22.

The atmospheric-side elastic body portion 32 extends parallel or substantially parallel to the direction of the axis Y1, and has an inner peripheral side portion 32c formed cylindrically or substantially cylindrically about the axis Y1. Further, the atmosphere-side elastic body portion 32 includes: an outer peripheral atmosphere portion 32d extending in parallel or substantially in parallel with the radial direction and having a circular or substantially circular ring shape around an axis Y1 extending from the atmosphere-side end of the inner peripheral portion 32c to the outer peripheral side; and an inner peripheral atmosphere portion 32b extending in parallel or substantially in parallel with the radial direction, and having a circular or substantially circular ring shape around an axis Y1 extending from the end of the inner space side of the inner peripheral portion 32c toward the inner peripheral side.

The atmospheric-side elastic body portion 32 covers the atmospheric side surface of the outer-peripheral-side flange portion 23 of the reinforcing ring 20, the inner-peripheral-side end portion of the outer-peripheral-side flange portion 23 (the atmospheric-side end portion of the cylindrical portion 21), the inner-peripheral-side surface of the cylindrical portion 21, the inner-space-side end portion of the cylindrical portion 21 (the outer-peripheral-side end portion of the inner-peripheral-side flange portion 22), and the atmospheric side surface of the inner-peripheral-side flange portion 22. The thickness T1 of the inner peripheral atmosphere side portion 32b of the elastic body portion 30 formed on the atmosphere side of the reinforcement ring 20 is larger than the thickness T2 of the internal space side portion 31a of the elastic body portion 30 formed on the internal space side of the reinforcement ring 20.

An atmosphere-side positioning portion 37 is formed on the outer peripheral atmosphere-side surface of the outer peripheral atmosphere-side portion 32d of the atmosphere-side elastic body portion 32, and the atmosphere-side positioning portion 37 is used to fix the position of the reinforcing ring 20 during vulcanization. The atmosphere-side positioning portion 37 is a groove portion that is recessed from the outer peripheral atmosphere-side surface of the outer peripheral atmosphere-side portion 32d toward the atmosphere-side surface of the outer peripheral flange portion 23 of the reinforcing ring 20 at the center portion in the radial direction of the outer peripheral atmosphere-side portion 32d and has a rectangular or substantially rectangular cross-sectional shape. Further, the atmosphere-side positioning portion 37 is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis Y1.

The inner peripheral atmosphere portion 32b of the atmosphere-side elastic body portion 32 is filled with an elastic body in the through hole 24 of the inner peripheral flange 22 of the reinforcing ring 20 and connected to the inner space portion 31a of the inner space-side elastic body portion 31, so that the adhesive force between the reinforcing ring 20 and the elastic body portion 30 can be increased.

The sealing lip 33 is formed as: the inner space side portion 31a of the inner space side elastic body portion 31 has a truncated cone shape or a substantially truncated cone shape extending toward the inner space side from the inner peripheral side end toward the inner peripheral side, and has a lip distal end portion 33a at the distal end. The lip tip portion 33a is a circular or substantially circular lip having a cross-sectional shape of a wedge shape projecting toward the inner peripheral side, and is formed in close contact with the slinger 40 so as to be slidable relative to the slinger 40. A Garter spring 38 is fitted around the outer peripheral side of the lip tip 33a, and the lip tip 33a is pressed radially inward by the Garter spring 38.

The dust lip 34 includes a first dust lip 34a, a second dust lip 34b, and a third dust lip 34c in this order from the inner space side. The first dust lip 34a is a truncated cone-shaped or substantially truncated cone-shaped lip extending toward the atmosphere from the inner peripheral end of the inner space side portion 31a of the inner space side elastic body portion 31 toward the inner peripheral side, and is formed to be slidably brought into close contact with the slinger 40.

The second dust lip 34b is a truncated cone-shaped or substantially truncated cone-shaped lip extending toward the atmosphere side from the inner peripheral end of the inner peripheral atmosphere portion 32b of the atmosphere side elastic body portion 32 toward the inner peripheral side, and is formed to be slidably brought into close contact with the slinger 40. The third dust lip 34c is a truncated cone-shaped or substantially truncated cone-shaped lip extending to the outer peripheral side from the inner peripheral end portion of the inner peripheral atmosphere portion 32b of the atmosphere-side elastic body portion 32 toward the atmosphere side, and is formed to be slidably brought into close contact with the slinger 40.

In the seal device 1, the slinger 40 is formed on the inner peripheral side of the seal device body 10, and the outer shape is formed in a circular or substantially circular ring shape about the axis Y1. The slinger 40 has: a reinforcing ring 50 that is circular or substantially cylindrical about the axis Y1, and an elastic body portion 60 that is formed of an elastic body integrally molded with the reinforcing ring 50 and that is circular or substantially circular about the axis Y1.

The elastomer of the elastomer portion 60 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcement ring 50 is made of, for example, metal, and is manufactured by press working or forging, and the elastic body portion 60 is molded by cross-linking (vulcanization) molding using a molding die.

The reinforcement ring 50 has: the air-side end portion 51b is an end portion of the cylindrical portion 51 on the air side. Specifically, the cylindrical portion 51 extends parallel or substantially parallel to the direction of the axis Y1, and is formed in a cylindrical shape or substantially cylindrical shape about the axis Y1. The cylindrical portion 51 is buried in the elastic body portion 60 at the air-side end and the inner peripheral side surface, and the elastic body portion 60 is exposed at the inner-space-side end and the outer peripheral side surface. The outer peripheral side surface of the cylindrical portion 51 is in slidable close contact with the seal lip 33, the first dust lip 34a, and the second dust lip 34 b.

The outer peripheral flange 52 extends in parallel or substantially in parallel with the radial direction, and is a flange that extends from the atmosphere-side end of the cylindrical portion 51 to the outer peripheral side and is annular or substantially annular about the axis Y1. The outer peripheral end, the inner peripheral end (the air-side end of the cylindrical portion 51), and the air-side surface of the outer peripheral-side flange portion 52 are buried in the elastic body portion 60, and the internal space-side surface is exposed from the elastic body portion 60. The inner space side surface 52a of the outer peripheral side flange portion 52 is in slidable close contact with the third dust lip 34 c.

The elastic body portion 60 includes: an inner peripheral side portion 61 extending parallel or substantially parallel to the direction of the axis Y1 and formed in a cylindrical shape or substantially cylindrical shape about the axis Y1; and an atmosphere-side portion 62 extending in parallel or substantially in parallel with the radial direction, and having a circular or substantially circular ring shape around an axis Y1 extending from the atmosphere-side end of the inner peripheral portion 61 toward the outer peripheral side. The elastic body portion 60 has an inner peripheral lip 63 extending from the inner peripheral portion 61 toward the inner peripheral side and having an annular or substantially annular shape about the axis Y1.

The inner peripheral portion 61 of the elastic body portion 60 covers the inner peripheral side surface and the atmosphere side end portion of the cylindrical portion 51. The atmosphere portion 62 of the elastic body portion 60 covers the inner peripheral end portion (the atmosphere end portion of the inner peripheral portion 61), the atmosphere side surface, and the outer peripheral end portion of the atmosphere portion 62. The outer peripheral end of the atmosphere portion 62 of the elastic body portion 60 faces the outer peripheral atmosphere portion 32d of the atmosphere-side elastic body portion 32 of the elastic body portion 30 with a predetermined gap therebetween, and a gap G is formed between the outer peripheral end of the atmosphere portion 62 of the elastic body portion 60 and the outer peripheral atmosphere portion 32d of the atmosphere-side elastic body portion 32.

Next, the seal structure 100 in a state in which the sealing device 1 is assembled will be described. Fig. 3 is a sectional view showing a schematic structure of the seal structure 100 in a state where the sealing device 1 according to the embodiment of the present invention is assembled to a sealing target. In fig. 3, only a single-sided portion of the sealing structure 100 and the sealing device 1 is shown. The seal structure 100 is configured by assembling the seal device 1 in an annular gap between an annular outer peripheral member 101 and an annular inner peripheral member 102 at least partially surrounded by the outer peripheral member 101, the annular gap being relatively rotatable with respect to each other on the axis Y1, and seals the annular gap between the outer peripheral member 101 and the inner peripheral member 102.

The inner peripheral member 102 includes: a rod-shaped portion 103 extending parallel or substantially parallel to the direction of the axis Y1 and formed in a cylindrical rod shape or substantially cylindrical rod shape about the axis Y1; and an outer peripheral flange portion 104 extending in parallel or substantially in parallel with the radial direction, extending from the atmosphere-side end portion 103b of the rod-shaped portion 103 to the outer peripheral side, and having an annular shape or a substantially annular shape about the axis Y1. The outer peripheral member 101 is disposed on the outer peripheral side of the inner peripheral member 102, and an opening 105 having a cylindrical or substantially cylindrical shape about the axis Y1 is formed in the outer peripheral member 101.

An inner peripheral member 102 is inserted into an opening 105 of the outer peripheral member 101, and an annular space is formed between the opening 105 and the outer peripheral side surface of the rod 103 of the inner peripheral member 102. That is, the outer peripheral member 101, the rod-shaped portion 103 of the inner peripheral member 102, and the outer peripheral flange 104 form a housing portion 106 for housing the sealing device 1. The housing portion 106 is recessed from the inner space sides of the outer peripheral member 101 and the inner peripheral member 102 toward the atmosphere, and a predetermined gap is formed between the outer peripheral member 101 and the outer peripheral flange portion 104 of the inner peripheral member 102.

The slinger 40 of the sealing device 1 is fixed to the outer peripheral side surface of the rod-shaped portion 103 of the inner peripheral member 102 by, for example, close fitting by the inner peripheral side lip portion 63 of the inner peripheral portion 61 of the elastic body portion 60, and the atmosphere portion 62 of the elastic body portion 60 of the slinger 40 is in close contact with the inner space side surface of the outer peripheral side flange portion 104 of the inner peripheral member 102. The sealing device body 10 of the sealing device 1 is fixed to the opening 105 of the outer peripheral member 101 by, for example, close fitting by the outer peripheral side lip 35 of the inner space side elastic body portion 31 of the elastic body portion 30, and the inner space side surface of the outer peripheral side flange portion 23 of the sealing device body 10 is in close contact with the atmosphere side end portion of the outer peripheral member 101.

The seal lip 33 in the elastic body portion 30 of the seal device body 10 of the seal device 1, and the first dust lip 34a and the second dust lip 34b of the dust lip 34 are slidably brought into close contact with the outer peripheral side surface of the cylindrical portion 51 of the slinger 40. The third dust lip 34c of the dust lip 34 is slidably in close contact with the inner space side surface of the outer peripheral flange 52 of the slinger 40.

A gap G is formed between the outer peripheral end of the inner peripheral portion 61 of the elastic body portion 60 and the outer peripheral atmosphere portion 32d of the atmosphere-side elastic body portion 32, and a predetermined gap between the outer peripheral member 101 and the outer peripheral flange 104 of the inner peripheral member 102 is reduced by the outer peripheral end of the inner peripheral portion 61 and the outer peripheral atmosphere portion 32d of the atmosphere-side elastic body portion 32. Thus, in the seal structure 100, the sealing device 1 is assembled in the annular gap between the annular inner peripheral member 102 at least partially surrounded by the outer peripheral member 101, whereby the annular gap between the outer peripheral member 101 and the inner peripheral member 102 can be sealed.

In this way, in the sealing device 1, the sealing device body 10 includes the annular reinforcing ring 20 centered on the axis Y1, and the annular elastic body portion 30 made of an elastic body and centered on the axis Y1 attached to the reinforcing ring 20. A through hole 24 for passing through between the inner space side surface of the reinforcement ring 20 and the atmosphere side surface is formed in the reinforcement ring 20, and a positioning portion 36 for fixing the position of the reinforcement ring 20 at the time of vulcanization is formed in the inner space side surface of the elastic body portion 30. The through-hole 24 and the positioning portion 36 of the sealing device 1 are formed at positions separated in the radial direction. Therefore, even when a crack is generated from the positioning portion 36, which is a portion where the thickness of the rubber material of the elastic body portion 30 is thin, due to swelling or contraction of the rubber material of the elastic body portion 30 caused by adhesion of the solvent, the through hole 24 and the positioning portion 36 are separated in the radial direction, and therefore, the crack generated from the positioning portion 36 is blocked by the reinforcing ring 20, and the through hole 24 can be prevented from being a through crack.

In the sealing device 1, the thickness T1 of the inner peripheral atmosphere-side portion 32b of the elastic body portion 30 formed on the atmosphere side of the reinforcing ring 20 is greater than the thickness T2 of the internal space-side portion 31a of the elastic body portion 30 formed on the internal space side of the reinforcing ring 20. Therefore, the penetration cracks formed through the through-hole 24 can be further suppressed. In the sealing device 1, the positioning portion 36 is an annular groove portion recessed from the inner space side to the atmosphere side, which is formed on the outer peripheral side and/or the inner peripheral side of the through-hole 24. Therefore, the position of the reinforcement ring 20 at the time of vulcanization can be easily fixed.

While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all embodiments included in the concept of the present invention and the claims. In order to achieve at least part of the above-described problems and effects, the respective structures may be selectively combined as appropriate. For example, the shape, material, arrangement, size, and the like of each component in the above embodiments can be appropriately changed according to a specific use mode of the present invention.

For example, the sealing device 1 according to the embodiment of the present invention has been described by exemplifying a case where the through-hole 24 is formed in a cylindrical shape or a substantially cylindrical shape, for example, and a plurality of (for example, 8) through-holes are formed at equal angular intervals or substantially equal angular intervals from the axis line Y1 in a concentric circle or substantially concentric circle shape. However, the present invention is not limited to this, and the through-hole 24 may be any hole having any shape, and the position, number, and size of the hole may be any position, number, and size.

In the sealing device 1 according to the embodiment of the present invention, the embodiment of the present invention is described by taking as an example a case where the positioning portion 36 is an annular groove portion recessed from the internal space side to the atmosphere side, which is formed on the outer peripheral side and/or the inner peripheral side of the through-hole 24. However, the present invention is not limited to this, and may have any shape as long as the position of the reinforcement ring 20 at the time of vulcanization can be fixed.

Description of the symbols

1 … seal, 10 … seal body, 20 … reinforcing ring, 30 … elastomer part, 24 … through hole, 36 … locating part, 40 … flinger, 100 … seal structure, 101 … outer peripheral part, 102 … inner peripheral part, G … gap, Y1 … axis.