Sealing device

Abstract

The present invention provides a sealing device capable of further suppressing the generation of through cracks in the rubber material of the elastomeric part. The sealing device (1) comprises a sealing device body (10) mounted on an outer peripheral side component (101) and an oil slinger (40) mounted on an inner peripheral side component (102). The sealing device body (10) comprises: an annular reinforcement ring (20) centered on an axis (Y1); and an annular elastomeric part (30) composed of an elastomer mounted on the reinforcement ring (20) and centered on the axis (Y1). A through hole (24) is formed in the reinforcement ring (20) for penetrating the inner space side and the atmospheric side of the reinforcement ring (20), and a positioning part (36) is formed on the inner space side of the elastomeric part (30) for fixing the position of the reinforcement ring (20) during vulcanization. The through hole (24) and the positioning part (36) of the sealing device (1) are formed at radially separated positions.

Description

Technical Field

[0001] The present invention relates to sealing devices. Background Art

[0002] Sealing devices having a plurality of relatively rotatable parts have been widely used. As such a sealing device, there is known a sealing device having: an oil slinger fixed to one of two relatively rotatable parts, such as a rotating shaft; and a sealing device body fixed to the other of the two relatively rotatable parts, such as an inner peripheral side surface of a shaft hole of a housing (for example, see Patent Document 1).

[0003] Such a sealing device is used to seal lubricants and the like in the inner space of a vehicle, general-purpose machinery, etc. A flange is provided on the slinger, and the flange prevents or reduces the intrusion of mud and dust from the atmosphere side to the inner space side. Therefore, such a sealing device is used in an environment with much mud or dust, such as a bogie of a railway vehicle, a bogie of a sintering tray, a construction machine, a balanced suspension of a truck, and an agricultural machine.

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent document 1: Japanese Patent No. 4978074. Summary of the invention

[0007] The sealing device body of such a sealing device has an annular reinforcement ring and an elastic body part made of a rubber material formed integrally so as to cover the reinforcement ring. The elastic body part is bonded to the reinforcement ring by cross-linking bonding, whereby the elastic body part and the reinforcement ring are formed integrally.

[0008] Sometimes holes are provided at equal intervals on the reinforcing ring to improve the adhesion between the elastomer part and the reinforcing ring, and the holes are filled with rubber material. Sometimes grooves are provided at equal intervals on the side of the inner space of the elastomer part to hold the reinforcing ring during cross-linking. Here, when the holes of the reinforcing ring and the grooves of the elastomer part overlap in the radial direction, the swelling and contraction of the rubber material caused by the adhesion of the solvent may cause cracks to form from the thin portion of the rubber material of the elastomer part, and may pass through the rubber material in the holes of the reinforcing ring to form through cracks. Therefore, a structure capable of further suppressing the generation of through cracks in the rubber material of the elastomer part is required for the conventional sealing device.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a sealing device capable of further suppressing the occurrence of through-cracks in the rubber material of the elastic body portion.

[0010] In order to achieve the above-mentioned purpose, the sealing device involved in the present invention seals between an annular outer peripheral side component that can rotate relative to each other on an axis and an annular inner peripheral side component that is at least partially surrounded by the outer peripheral side component. The sealing device is characterized in that it includes: a sealing device body, which is installed on the outer peripheral side component; and an oil slinger, which is installed on the inner peripheral side component. The sealing device body has: an annular reinforcement ring centered on the axis; and an annular elastomeric portion, which is composed of an elastomer installed on the reinforcement ring and centered on the axis. A through hole is formed on the reinforcement ring to penetrate between the inner space side of the reinforcement ring and the atmospheric side, and a positioning portion is formed on the inner space side of the elastomeric portion for fixing the position of the reinforcement ring during vulcanization, and the through hole and the positioning portion are formed at radially separated positions.

[0011] 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 reinforcement ring is greater than the thickness of the elastic body portion formed on the internal space side of the reinforcement ring.

[0012] In the sealing device according to one aspect of the present invention, 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 internal space side to the atmosphere side.

[0013] According to the sealing device of the present invention, it is possible to further suppress the occurrence of penetrating cracks in the rubber material of the elastic body portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view for illustrating a schematic structure of a sealing device according to an embodiment of the present invention;

[0015] Figure 2 is an enlarged cross-sectional view for illustrating a schematic structure of a through hole and a positioning portion of a sealing device according to an embodiment of the present invention;

[0016] Figure 3 This is a cross-sectional view showing a schematic structure of a sealing structure in a state where the sealing device according to the embodiment of the present invention is assembled to a sealed object. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0018] Figure 1 It is a cross-sectional view for showing the schematic structure of the sealing device 1 according to the embodiment of the present invention. Figure 2 2 is an enlarged cross-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. Figure 1 , 2In the figure, only one side of the sealing device 1 is shown. The sealing device 1 is used in muddy or dusty environments such as the bogies of railway vehicles, the bogies of sintering trays, construction machinery, balanced suspensions of trucks, and agricultural machinery (tillers, tractors, rice transplanters, etc.). The sealing device 1 plays a role in sealing between an annular outer peripheral side member that can rotate relative to each other and an annular inner peripheral side member that is at least partially surrounded by the outer peripheral side member. In addition, the objects to which the sealing device 1 is applicable are not limited to the above.

[0019] The sealing device 1 according to the embodiment of the present invention is a sealing device that seals between an annular outer circumferential member 101 that is relatively rotatable on an axis Y1 and an annular inner circumferential member 102 that is at least partially surrounded by the outer circumferential member 101. The sealing device 1 includes a sealing device body 10 mounted on the outer circumferential member 101 and an oil slinger 40 mounted on the inner circumferential member 102.

[0020] The sealing device body 10 includes: an annular reinforcement ring 20, centered on the axis Y1; and an annular elastic body portion 30, which is composed of an elastic body mounted on the reinforcement ring 20 and centered on the axis Y1. A through hole 24 is formed on the reinforcement ring 20 for penetrating between the inner space side of the reinforcement ring 20 and the atmospheric side, and a positioning portion 36 is formed on the inner space side of the elastic body portion 30 for fixing the position of the reinforcement ring 20 during vulcanization. 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 is described in detail below.

[0021] In the following description, for the sake of convenience, Figure 1 , 2 The axis of the sealing device 1 in the direction of the axis Y1 (hereinafter referred to as the axis Y1 direction) is set as the inner space side (arrow a direction), and the other side (arrow b direction) is set as the atmosphere side. Figure 1 , 2 The one side (arrow c direction) of the direction extending orthogonally to the axis Y1 of the sealing device 1 (hereinafter also referred to as the radial direction) is regarded as the inner peripheral side, and the other side (arrow d direction) is regarded as the outer peripheral side. In the following description, when describing the positional relationship and direction of each component, the positional relationship and direction in the drawings are always indicated, and the positional relationship and direction when assembled to an actual vehicle, etc. are not indicated.

[0022] like Figure 1As shown, the outer shape of the sealing device 1 is formed in an annular or substantially annular shape around the axis Y1, and a cylindrical or substantially cylindrical opening portion 2 is formed in the central portion. The sealing device 1 includes a sealing device body 10 that is annular or substantially annular around the axis Y1, and an oil slinger 40 that is formed on the inner circumference of the sealing device body 10 and is cylindrical or substantially cylindrical around the axis Y1.

[0023] In the sealing device 1, the outer shape of the sealing device body 10 is formed into a circular ring or a substantially circular ring around the axis Y1. The sealing device body 10 has a reinforcing ring 20 that is circular ring-shaped or substantially cylindrical around the axis Y1, and an elastic body portion 30 that is formed of an elastic body integrally formed with the reinforcing ring 20 and is circular ring-shaped or substantially circular ring-shaped around the axis Y1.

[0024] The elastic body of the elastic body portion 30 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcement ring 20 is, for example, made of metal and manufactured by press working or forging, and the elastic body portion 30 is molded by crosslinking (vulcanization) molding using a molding die.

[0025] The reinforcing ring 20 has: a cylindrical portion 21; an annular inner peripheral side flange portion 22, which extends from the inner space side end portion to the inner peripheral side, and the inner space side end portion is the inner space side end portion of the cylindrical portion 21; and an annular outer peripheral side flange portion 23, which extends from the atmosphere side end portion to the outer peripheral side, and the atmosphere side end portion is the atmosphere side end portion of the cylindrical portion 21. Specifically, the cylindrical portion 21 extends parallel or substantially parallel to the axis Y1 direction, and is formed into a cylindrical or substantially cylindrical shape around the axis Y1. The inner space side end portion, the atmosphere side end portion, the inner peripheral side surface, and the outer peripheral side surface of the cylindrical portion 21 are buried in the elastic body portion 30.

[0026] The inner flange portion 22 extends parallel or substantially parallel to the radial direction, and is a flange portion extending from the inner space side end of the cylindrical portion 21 toward the inner circumference, and is annular or substantially annular around the axis Y1. The inner space side surface, the atmosphere side surface, the inner circumference side end, and the outer circumference side end (the inner space side end of the cylindrical portion 21) of the inner flange portion 22 are buried in the elastic body portion 30.

[0027] A through hole 24 is formed in the radial center of the inner flange 22, and the through hole 24 is used to penetrate between the inner space side and the atmosphere side of the inner flange 22 of the reinforcement ring 20. The through hole 24 is formed, for example, in a cylindrical shape or a substantially cylindrical shape, and a plurality of (e.g., 8) through holes 24 are formed concentrically or substantially concentrically from the axis Y1 at equal angle intervals or substantially equal angle intervals. The diameter of the through hole 24 is, for example, 3 mm, and the through hole 24 is filled with the elastic body of the elastic body 30.

[0028] The outer peripheral flange portion 23 extends parallel or substantially parallel to the radial direction, and is a flange portion extending from the atmosphere side end of the cylindrical portion 21 toward the outer peripheral side, and is annular or substantially annular around the axis Y1. The inner peripheral side end (the atmosphere side end of the cylindrical portion 21) and the atmosphere side surface of the outer peripheral flange portion 23 are buried in the elastic body portion 30, and the outer peripheral side end and most of the internal space side surface are exposed from the elastic body portion 30.

[0029] The elastic body portion 30 includes an inner space side elastic body portion 31, an atmosphere side elastic body portion 32, a sealing lip portion 33, and a dustproof lip portion 34. Specifically, the inner space side elastic body portion 31 includes: an outer peripheral side portion 31d extending parallel or substantially parallel to the axis Y1 direction and forming a cylindrical or substantially cylindrical shape around the axis Y1; and an inner space side portion 31a extending parallel or substantially parallel to the radial direction, extending from the inner space side end portion of the outer peripheral side portion 31d toward the outer peripheral side and forming a circular ring or a substantially circular ring around the axis Y1.

[0030] The inner space side elastic body portion 31 covers the outer peripheral side surface of the cylindrical portion 21, the inner space side end portion of the cylindrical portion 21 (the outer peripheral end portion of the inner peripheral side flange portion 22), and the inner space side surface of the inner peripheral side flange portion 22. The inner space side elastic body portion 31 has an outer peripheral side lip portion 35 extending from the outer peripheral side portion 31d toward the outer peripheral side and having a circular or substantially circular ring shape around the axis Y1.

[0031] A positioning portion 36 is formed on the inner space side portion 31a of the inner space side elastic body portion 31. The positioning portion 36 is used to fix the position of the reinforcement ring 20 during vulcanization. The positioning portion 36 is an annular groove portion that is formed on the outer circumference and / or inner circumference of the through hole 24 and is recessed from the inner space side to the atmosphere side. Specifically, the positioning portion 36 includes an inner circumference side positioning portion 36c and an outer circumference side positioning portion 36d.

[0032] like Figure 2 As shown, the inner circumference side positioning portion 36c is a groove portion having a rectangular or substantially rectangular shape in cross-section, which 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 circumference side flange portion 22 of the reinforcement ring 20 on the inner circumference side of the through hole 24. In addition, the inner circumference side positioning portion 36c is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis Y1.

[0033] The inner circumference side positioning portion 36c has a circular or substantially circular 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 circumference side positioning portion 36c toward the atmosphere side. The bottom surface 36ct does not reach the inner space side surface of the inner circumference side flange portion 22 of the reinforcement ring 20, but defines a boundary of the inner circumference side positioning portion 36c on the atmosphere side.

[0034] 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 36c. The inner peripheral side surface 36cc of the inner peripheral side positioning portion 36c is a surface that defines the boundary of the inner peripheral side of the inner peripheral side positioning portion 36c, and the outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c is a surface that defines the boundary of the outer peripheral side of the inner peripheral side positioning portion 36c.

[0035] 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 of the inner peripheral side of the bottom surface 36ct toward the inner space side along the axis Y1 direction with the axis Y1 as the center. The outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c is a cylindrical or substantially cylindrical surface extending from the edge of the outer peripheral side of the bottom surface 36ct toward the inner space side along the axis Y1 direction with the axis Y1 as the center.

[0036] The outer peripheral side positioning portion 36d is a groove portion having a rectangular or substantially rectangular cross-sectional view and 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 peripheral side flange portion 22 of the reinforcement ring 20 on the outer peripheral side of the through hole 24. The outer peripheral side positioning portion 36d is a circumferential groove formed in a bottomed cylindrical shape or a substantially bottomed cylindrical shape around the axis Y1.

[0037] The outer circumference side positioning portion 36d has a circular or substantially circular bottom surface 36dt 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 space side elastic body portion 31 to the atmosphere side. The bottom surface 36dt does not reach the inner space side surface of the inner circumference side flange portion 22 of the reinforcement ring 20, but defines a boundary of the outer circumference side positioning portion 36d on the atmosphere side.

[0038] 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 36d. The inner peripheral side surface 36dc of the outer peripheral side positioning portion 36d is a surface that defines the boundary of the inner peripheral side of the outer peripheral side positioning portion 36d, and the outer peripheral side surface 36dd of the outer peripheral side positioning portion 36d is a surface that defines the boundary of the outer peripheral side of the outer peripheral side positioning portion 36d.

[0039] 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 of the inner peripheral side of the bottom surface 36dt toward the inner space side along the axis Y1 direction with the axis Y1 as the center. The outer peripheral side surface 36dd of the outer peripheral side positioning portion 36d is a cylindrical or substantially cylindrical surface extending from the edge of the outer peripheral side of the bottom surface 36dt toward the inner space side along the axis Y1 direction with the axis Y1 as the center.

[0040] Here, the through hole 24 and the positioning portion 36 of the sealing device 1 are formed at radially separated positions. Specifically, the outer peripheral side surface 36cd of the inner peripheral side positioning portion 36c is formed at a position closer to the inner peripheral side than 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 at a position closer to the outer peripheral side than 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 surface of the bottom surface 36ct of the inner peripheral side positioning portion 36c and the bottom surface 36dt of the outer peripheral side positioning portion 36d are opposite to the inner space side surface 22a of the inner peripheral side flange portion 22.

[0041] The atmosphere-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 in a cylindrical or substantially cylindrical shape around the axis Y1. In addition, the atmosphere-side elastic body portion 32 has: an outer peripheral atmosphere-side portion 32d extending parallel or substantially parallel to the radial direction, and extending from the atmosphere-side end of the inner peripheral side portion 32c to the outer peripheral side in a circular or substantially circular shape around the axis Y1; and an inner peripheral atmosphere-side portion 32b extending parallel or substantially parallel to the radial direction, and extending from the inner space-side end of the inner peripheral side portion 32c to the inner peripheral side in a circular or substantially circular shape around the axis Y1.

[0042] The atmosphere-side elastic body portion 32 covers the atmosphere side surface of the outer circumferential side flange portion 23 of the reinforcement ring 20, the inner circumferential side end portion of the outer circumferential side flange portion 23 (the atmosphere-side end portion of the cylindrical portion 21), the inner circumferential side surface of the cylindrical portion 21, the inner space-side end portion of the cylindrical portion 21 (the outer circumferential side end portion of the inner circumferential side flange portion 22), and the atmosphere side surface of the inner circumferential side flange portion 22. The thickness T1 of the inner circumferential atmosphere-side portion 32b of the elastic body portion 30 formed on the atmosphere side of the reinforcement ring 20 is greater than the thickness T2 of the inner space-side portion 31a of the elastic body portion 30 formed on the inner space side of the reinforcement ring 20.

[0043] An atmosphere-side positioning portion 37 is formed on the outer peripheral atmosphere-side 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 reinforcement ring 20 during vulcanization. The atmosphere-side positioning portion 37 is a groove portion that is recessed from the outer peripheral atmosphere-side side surface of the outer peripheral atmosphere-side portion 32d toward the atmosphere-side side surface of the outer peripheral flange portion 23 of the reinforcement ring 20 in the radial direction of the center portion, and is rectangular or substantially rectangular in cross-sectional view. In addition, 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.

[0044] The inner circumferential atmospheric side portion 32b of the atmospheric side elastomer portion 32 is connected to the inner space side portion 31a of the inner space side elastomer portion 31 by filling the through hole 24 of the inner circumferential side flange portion 22 of the reinforcement ring 20 with elastomer, thereby improving the adhesion between the reinforcement ring 20 and the elastomer portion 30.

[0045] The sealing lip portion 33 is formed in a truncated cone shape or a substantially truncated cone shape extending toward the inner space side from the inner circumference side end of the inner space side portion 31a of the inner space side elastic body portion 31 toward the inner circumference side, and has a lip front end portion 33a at the front end. The lip front end portion 33a is a circular ring or a substantially circular ring lip whose cross-sectional shape is a wedge shape protruding toward the inner circumference side, and is formed to be in close contact with the slinger 40 in a manner that can slide relative to the slinger 40. In addition, an annular coil spring (Garter spring) 38 is embedded on the outer circumference side of the lip front end portion 33a, and the annular coil spring 38 presses the lip front end portion 33a toward the inner circumference in the radial direction.

[0046] The dustproof lip 34 includes a first dustproof lip 34a, a second dustproof lip 34b, and a third dustproof lip 34c in order from the inner space side. The first dustproof lip 34a is a truncated cone or substantially truncated cone shaped lip extending toward the atmosphere side from the inner peripheral side 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 in close contact with the slinger 40 in a slidable manner.

[0047] The second dustproof lip 34b is a truncated cone or substantially truncated cone-shaped lip extending toward the atmosphere side from the inner circumference side end of the inner circumference atmosphere side portion 32b of the atmosphere side elastic body portion 32 toward the inner circumference side, and is formed to be in close contact with the slinger 40 in a slidable manner. The third dustproof lip 34c is a truncated cone or substantially truncated cone-shaped lip extending toward the outer circumference side from the inner circumference side end of the inner circumference atmosphere side portion 32b of the atmosphere side elastic body portion 32 toward the atmosphere side, and is formed to be in close contact with the slinger 40 in a slidable manner.

[0048] In the sealing device 1, the slinger 40 is formed on the inner circumference of the sealing device body 10, and its outer shape is formed into a ring shape or a substantially ring shape around the axis Y1. The slinger 40 has a reinforcement ring 50 that is a ring shape or a substantially cylindrical shape around the axis Y1, and an elastic body portion 60 that is formed of an elastic body integrally formed with the reinforcement ring 50 and is a ring shape or a substantially ring shape around the axis Y1.

[0049] The elastic body of the elastic body portion 60 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcement ring 50 is, for example, made of metal and manufactured by press working or forging, and the elastic body portion 60 is molded by crosslinking (vulcanization) molding using a molding die.

[0050] The reinforcement ring 50 includes a cylindrical portion 51 and an annular outer peripheral side flange portion 52 extending from an atmospheric side end 51b of the cylindrical portion 51 to the outer peripheral side, wherein the atmospheric side end 51b is an atmospheric side end of the cylindrical portion 51. Specifically, the cylindrical portion 51 extends parallel or substantially parallel to the axis Y1 direction, and is formed into a cylindrical or substantially cylindrical shape around the axis Y1. The atmospheric side end and the inner peripheral side of the cylindrical portion 51 are buried in the elastic body portion 60, and the inner space side end and the outer peripheral side are exposed from the elastic body portion 60. The outer peripheral side of the cylindrical portion 51 is in close contact with the sealing lip 33, the first dustproof lip 34a, and the second dustproof lip 34b in a slidable manner.

[0051] The outer flange portion 52 extends parallel or substantially parallel to the radial direction, and is a flange portion in a circular ring or substantially circular ring shape around the axis Y1 extending from the atmosphere side end of the cylindrical portion 51 to the outer peripheral side. The outer peripheral side end, the inner peripheral side end (the atmosphere side end of the cylindrical portion 51), and the atmosphere side surface of the outer 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 internal space side surface 52a of the outer flange portion 52 is in close contact with the third dust lip 34c in a slidable manner.

[0052] The elastic body portion 60 includes: an inner peripheral side portion 61 extending parallel or substantially parallel to the axis Y1 direction and formed in a cylindrical or substantially cylindrical shape around the axis Y1; and an atmosphere side portion 62 extending parallel or substantially parallel to the radial direction and extending from the atmosphere side end of the inner peripheral side portion 61 toward the outer circumference and forming a circular or substantially circular ring shape around the axis Y1. In addition, the elastic body portion 60 includes an inner peripheral side lip portion 63 extending from the inner peripheral side portion 61 toward the inner circumference and forming a circular or substantially circular ring shape around the axis Y1.

[0053] The inner circumference side portion 61 of the elastic body portion 60 covers the inner circumference side surface and the atmosphere side end portion of the cylindrical portion 51. The atmosphere side portion 62 of the elastic body portion 60 covers the inner circumference side end portion (the atmosphere side end portion of the inner circumference side portion 61), the atmosphere side surface, and the outer circumference side end portion of the atmosphere side portion 62. The outer circumference side end portion of the atmosphere side portion 62 of the elastic body portion 60 is opposed to the outer circumference atmosphere side portion 32d of the atmosphere side elastic body portion 32 of the elastic body portion 30 with a predetermined gap, and a gap G is formed between the outer circumference side end portion of the atmosphere side portion 62 of the elastic body portion 60 and the outer circumference atmosphere side portion 32d of the atmosphere side elastic body portion 32.

[0054] Next, the sealing structure 100 in a state in which the sealing device 1 is assembled will be described. Figure 3 1 is a cross-sectional view showing a schematic structure of a sealing structure 100 in a state where the sealing device 1 according to the embodiment of the present invention is assembled to a sealing object. Figure 3 , only one side of the sealing structure 100 and the sealing device 1 is shown. The sealing structure 100 is formed by assembling the sealing device 1 in an annular gap between an annular outer circumferential side component 101 that can rotate relative to each other on the axis Y1 and an annular inner circumferential side component 102 that is at least partially surrounded by the outer circumferential side component 101, thereby achieving sealing of the annular gap between the outer circumferential side component 101 and the inner circumferential side component 102.

[0055] The inner circumference side member 102 has: a rod-shaped portion 103 extending parallel or substantially parallel to the axis Y1 direction and formed into a cylindrical rod shape or substantially cylindrical rod shape around the axis Y1; and an outer circumference side flange portion 104 extending parallel or substantially parallel to the radial direction, extending from the atmosphere side end 103b of the rod-shaped portion 103 toward the outer circumference side and forming a circular ring shape or substantially circular ring shape around the axis Y1. The outer circumference side member 101 is arranged on the outer circumference side of the inner circumference side member 102, and an opening portion 105 having a cylindrical shape or substantially cylindrical shape around the axis Y1 is formed on the outer circumference side member 101.

[0056] The inner circumference member 102 is inserted into the opening 105 of the outer circumference member 101, and an annular space is formed between the opening 105 and the outer circumferential side surface of the rod-shaped portion 103 of the inner circumference member 102. That is, the outer circumference member 101, the rod-shaped portion 103 of the inner circumference member 102, and the outer circumference flange portion 104 form a housing portion 106 for housing the sealing device 1. The housing portion 106 is recessed from the inner space side of the outer circumference member 101 and the inner circumference member 102 to the atmosphere side, and a predetermined gap is formed between the outer circumference member 101 and the outer circumference flange portion 104 of the inner circumference member 102.

[0057] The slinger 40 of the sealing device 1 is fixed to the outer peripheral side of the rod-shaped portion 103 of the inner peripheral member 102 by, for example, a closed fit, through the inner peripheral side lip portion 63 of the inner peripheral side portion 61 of the elastic body portion 60, and the atmosphere side portion 62 of the elastic body portion 60 of the slinger 40 is in close contact with the inner space side 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 portion 105 of the outer peripheral side member 101 by, for example, a closed fit, through the outer peripheral side lip portion 35 of the elastic body portion 31 on the inner space side of the elastic body portion 30, and the inner space side of the outer peripheral side flange portion 23 of the sealing device body 10 is in close contact with the atmosphere side end of the outer peripheral side member 101.

[0058] The sealing lip 33 in the elastic body portion 30 of the sealing device body 10 of the sealing device 1, and the first dustproof lip 34a and the second dustproof lip 34b of the dustproof lip 34 are in close contact with the outer peripheral side surface of the cylindrical portion 51 of the slinger 40 in a slidable manner. In addition, the third dustproof lip 34c of the dustproof lip 34 is in close contact with the inner space side surface of the outer peripheral side flange portion 52 of the slinger 40 in a slidable manner.

[0059] 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 atmospheric side portion 32d of the atmospheric side elastic body portion 32, and a predetermined gap between the outer peripheral side component 101 and the outer peripheral side flange portion 104 of the inner peripheral side component 102 is reduced by the outer peripheral side end of the inner peripheral side portion 61 and the outer peripheral atmospheric side portion 32d of the atmospheric side elastic body portion 32. Thus, in the sealing structure 100, by assembling the sealing device 1 in the annular gap between the inner peripheral side component 102 and the annular inner peripheral side component 102 at least partially surrounded by the outer peripheral side component 101, the annular gap between the outer peripheral side component 101 and the inner peripheral side component 102 can be sealed.

[0060] Thus, in the sealing device 1, the sealing device main body 10 includes the annular reinforcement ring 20 centered on the axis Y1, and the annular elastic body part 30 made of an elastomer and mounted on the reinforcement ring 20 and centered on the axis Y1. The reinforcement ring 20 is provided with a through hole 24 for penetrating between the inner space side and the atmospheric side of the reinforcement ring 20, and the inner space side of the elastic body part 30 is provided with a positioning part 36 for fixing the position of the reinforcement ring 20 during vulcanization. The through hole 24 and the positioning part 36 of the sealing device 1 are formed at positions separated in the radial direction. Therefore, even if cracks are generated from the positioning part 36, which is a portion where the thickness of the rubber material of the elastic body part 30 is relatively thin due to swelling and contraction of the rubber material of the elastic body part 30 caused by the adhesion of the solvent, the through hole 24 and the positioning part 36 are separated in the radial direction, so that the cracks generated from the positioning part 36 are blocked by the reinforcement ring 20, and it is possible to prevent the cracks from passing through the through hole 24 and becoming through cracks.

[0061] In addition, in the sealing device 1, the thickness T1 of the inner circumferential atmosphere side portion 32b of the elastic body portion 30 formed on the atmosphere side of the reinforcement ring 20 is greater than the thickness T2 of the inner space side portion 31a of the elastic body portion 30 formed on the inner space side of the reinforcement ring 20. Therefore, it is possible to further suppress the formation of through cracks through the through hole 24. In addition, in the sealing device 1, the positioning portion 36 is an annular groove portion that is formed on the outer circumferential side and / or the inner circumferential side of the through hole 24 and is recessed from the inner space side to the atmosphere side. Therefore, the position of the reinforcement ring 20 during vulcanization can be easily fixed.

[0062] The preferred embodiments of the present invention are described above, but the present invention is not limited to the above-mentioned embodiments, including all modes included in the concept of the present invention and the claims. In addition, in order to achieve at least a part of the above-mentioned topics and effects, each structure can also be appropriately and selectively combined. In addition, for example, the shape, material, configuration, size, etc. of each component in the above-mentioned embodiment can be appropriately changed according to the specific use mode of the present invention.

[0063] For example, regarding the sealing device 1 involved in the embodiment of the present invention, the embodiment of the present invention is described by taking as an example the case where the through hole 24 is formed, for example, in a cylindrical shape or a substantially cylindrical shape, and a plurality of (e.g., 8) through holes are formed at equal angle intervals or substantially equal angle intervals in a concentric circle or a substantially concentric circle shape from the axis Y1. However, the present invention is not limited to this, and the through hole 24 can be a hole of any shape, and the position, number, and size of the hole can be formed at any position, number, and size.

[0064] In addition, regarding the sealing device 1 of the embodiment of the present invention, the embodiment of the present invention has been described by taking as an example the case where the positioning portion 36 is an annular groove portion that is formed on the outer circumferential side and / or the inner circumferential side of the through hole 24 and is recessed from the internal space side to the atmosphere side. However, the present invention is not limited to this, and any shape may be used as long as the position of the reinforcement ring 20 during vulcanization can be fixed.

[0065] Explanation of symbols

[0066] 1…sealing device, 10…sealing device body, 20…reinforcing ring, 30…elastic body portion, 24…through hole, 36…positioning portion, 40…slingering ring, 100…sealing structure, 101…outer peripheral side component, 102…inner peripheral side component, G…gap, Y1…axis line.

Claims

1. A sealing device for sealing between an annular outer peripheral member and an inner peripheral member which are rotatable relative to each other on an axis, wherein the inner peripheral member is annular and at least a part of the inner peripheral member is surrounded by the outer peripheral member, the sealing device comprising: A sealing device body, mounted on the outer peripheral side member; as well as An oil slinger is mounted on the inner peripheral part. The sealing device body comprises: an annular reinforcement ring centered on the axis; and The annular elastic body portion is composed of an elastic body mounted on the reinforcing ring and is centered on the axis. The reinforcement ring has a flange portion extending parallel to the radial direction, A through hole is formed on the flange portion, and the through hole is used to penetrate the inner space side and the atmospheric side of the reinforcement ring. A positioning portion is formed on the side of the inner space of the elastic body portion, and the positioning portion is used to fix the position of the reinforcement ring during vulcanization. The positioning portion includes an inner peripheral side positioning portion located on the inner peripheral side of the through hole and an outer peripheral side positioning portion located on the outer peripheral side of the through hole. The inner circumference side positioning portion and the outer circumference side positioning portion are recessed toward the flange portion, The through hole and the positioning portion are formed at positions separated in the radial direction.

2. The sealing device according to claim 1, characterized in that: The thickness of the elastic body portion formed on the atmosphere side of the reinforcement ring is greater than the thickness of the elastic body portion formed on the internal space side of the reinforcement ring.

3. The sealing device according to claim 1 or 2, characterized in that: The positioning portion is an annular groove portion formed on the outer circumferential side and the inner circumferential side of the through hole and recessed from the internal space side to the atmosphere side.

Images