JP2020176653A - Sealing device and sealing structure - Google Patents

Abstract

To provide a sealing device which can further inhibit itself from being inclined when assembled to between a housing and a shaft.SOLUTION: A sealing device 1 includes: an annular reinforcement ring 10 formed around an axis Y1; and an annular elastic body part 20 provided around the axis Y1 and formed of an elastic body attached to the reinforcement ring 10. The reinforcement ring 10 has: a cylindrical part 11; and an outer periphery protruding part 12 extending from a lower end part 11b of the cylindrical part 11 to an outer periphery side. The elastic body part 20 has an outer periphery side elastic body part 21 on an outer peripheral surface 11d of the cylindrical part 11 of the reinforcement ring 10. A gap C is formed between the outer periphery protruding part 12 and the outer periphery side elastic body part 21 so that a housing 100 fits in the outer periphery protruding part 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device and a sealing structure.

In vehicles and general-purpose machines, for example, automobiles, sealing devices such as a plug tube seal that seals between an engine head cover as a housing and a plug tube as a shaft have been widely used. As such a sealing device, a seal main body and a seal lip are formed, the seal main body is fitted to the inner peripheral surface of the engine head cover, and the seal lip is brought into contact with the outer peripheral surface of the plug tube. , There is a plug tube seal that seals between the engine head cover and the plug tube (see, for example, Patent Document 1).

Utility Model Registration No. 301604

When assembling such a sealing device between the engine head cover and the plug tube, the sealing body of the sealing device is deformed in the axial direction and the circumferential direction, and returns to the axial direction when the force at the time of assembly is removed. Due to the so-called springback phenomenon in which the force is generated, the sealing device may be tilted and assembled. Therefore, the conventional sealing device is required to have a structure capable of further suppressing the sealing device from being assembled at an angle.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sealing device and a sealing structure capable of further suppressing tilting assembly between a housing and a shaft. is there.

In order to achieve the above object, the sealing device according to the present invention is a sealing device for sealing an annular gap between a shaft and a housing having an opening into which the shaft is inserted, and is annular around the axis. The reinforcing ring is provided with an elastic body portion having an annular shape around the axis formed from the elastic body attached to the reinforcing ring, and the reinforcing ring is formed on one side of the tubular portion and the tubular portion. The elastic body portion has an outer peripheral convex portion extending from the end portion to the outer peripheral side, and the elastic body portion has an outer peripheral side elastic body portion on the outer peripheral surface of the tubular portion of the reinforcing ring, and the outer peripheral convex portion. A gap is formed between the outer peripheral side elastic body portion and the outer peripheral side elastic body portion so that the housing fits into the outer peripheral convex portion.

In the sealing device according to one aspect of the present invention, the outer peripheral surface of the outer peripheral convex portion is inclined toward the inner peripheral side toward one side.

In the sealing device according to one aspect of the present invention, the outer peripheral convex portion is an annular flange extending from one end of the tubular portion to the outer peripheral side, and the reinforcing ring has the outer circumference of the outer peripheral convex portion. A plurality of grooves extending from the surface to the tubular portion are formed at equal intervals.

In the sealing device according to one aspect of the present invention, the reinforcing ring has an annular inner peripheral flange portion extending from the other side end portion of the tubular portion to the inner peripheral side, and the elastic body portion is It has an annular seal lip portion that extends to one side from the other side end portion of the tubular portion toward the inner peripheral side.

In the sealing device according to one aspect of the present invention, the elastic body portion has an annular outer peripheral lip portion extending from the outer peripheral surface of the outer peripheral side elastic body portion to the outer peripheral side.

In order to achieve the above object, the sealing structure according to the present invention is a sealing device for sealing an annular gap between a shaft, a housing having an opening into which the shaft is inserted, and the shaft and the housing. The sealing device has an annular reinforcing ring around the axis and an annular elastic body portion formed from the elastic body attached to the reinforcing ring. The reinforcing ring has a tubular portion and an outer peripheral convex portion extending from one end of the tubular portion to the outer peripheral side, and the elastic body portion is the tubular portion of the reinforcing ring. The outer peripheral side elastic body portion is provided on the outer peripheral surface, and a gap is formed between the outer peripheral convex portion and the outer peripheral side elastic body portion so that the housing fits into the outer peripheral convex portion. The housing has a flange portion extending from one end of the housing to the inner circumference, and the flange portion of the housing is fitted into the gap of the sealing device. To do.

According to the sealing device according to the present invention, it is possible to further prevent the housing and the shaft from being assembled at an angle.

It is sectional drawing for showing the schematic structure of the sealing device which concerns on embodiment of this invention. It is sectional drawing which shows the sealing structure which is the state which the sealing device which concerns on embodiment of this invention is assembled between the plug tube to be sealed, and a housing.

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

FIG. 1 is a cross-sectional view for showing a schematic configuration of a sealing device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the sealing device 1 according to the embodiment of the present invention is assembled between the plug tube 110 to be sealed and the housing 100. The sealing device 1 is used in an automobile-related field (including an internal combustion engine and an auxiliary machine), a general industrial machine field, or the like. For example, in the field of automobiles, the sealing device 1 is used as a plug tube seal for sealing between a cylinder head cover and a plug tube in an internal combustion engine, an injection pipe seal for sealing between a cylinder head cover and an injection pipe, and the like. That is, the sealing device 1 plays a role of sealing the gap between various two members to be sealed. The target 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 aims to seal an annular gap between the plug tube 110 as a shaft and the housing 100 having an opening 101 into which the plug tube 110 is inserted. The sealing device 1 includes an annular reinforcing ring 10 around the axis Y1 and an annular elastic body portion 20 around the axis Y1 formed of an elastic body attached to the reinforcing ring 10. The reinforcing ring 10 has a tubular portion 11 and an outer peripheral convex portion 12 extending from one side end portion (lower end portion 11b) of the tubular portion 11 to the outer peripheral side. The elastic body portion 20 has an outer peripheral side elastic body portion 21 on the outer peripheral surface 11d of the tubular portion 11 of the reinforcing ring 10. A gap C is formed between the outer peripheral convex portion 12 and the outer peripheral side elastic body portion 21 so that the housing 100 fits into the outer peripheral convex portion 12. Hereinafter, the configuration of the sealing device 1 will be specifically described.

In the following description, for convenience of explanation, the other (arrow a direction) in the direction of the axis Y1 which is the axis of the sealing device 1 in FIGS. 1 and 2 (hereinafter, also referred to as the axis Y1 direction) is on the upper side, and one (arrow b direction). ) Is on the lower side. Further, one side (arrow c direction) in the radial direction extending orthogonal to the axis Y1 of the sealing device 1 in FIGS. 1 and 2 is the inner peripheral side, and the other (arrow d direction) is the outer peripheral side. In the following explanation, when the positional relationship and direction of each member are explained using the upper and lower sides, the positional relationship and direction in the drawing are shown to the last, and the positional relationship and direction when incorporated in an actual vehicle or the like are not shown. Absent.

As shown in FIG. 1, the outer shape of the sealing device 1 is formed in an annular shape or a substantially annular shape around the axis Y1, and a cylindrical or substantially cylindrical opening 2 is formed in the central portion thereof. ing. The sealing device 1 is formed of a cylindrical or substantially cylindrical reinforcing ring 10 around the axis Y1 and an elastic body integrally formed with the reinforcing ring 10, and has an annular or substantially annular elasticity around the axis Y1. It has a body part 20 and.

In the sealing device 1, the elastic body of the elastic body portion 20 is, for example, a rubber material such as fluororubber or acrylic rubber. The reinforcing ring 10 is made of metal, for example, and is manufactured by press working or forging, and the elastic body portion 20 is molded by cross-linking (vulcanization) molding using a molding die.

The reinforcing ring 10 includes a tubular portion 11, an outer peripheral convex portion 12 extending from the lower end portion 11b, which is one end portion of the tubular portion 11, to the outer peripheral side (direction of arrow d), and the other side of the tubular portion 11. It has an annular inner peripheral flange portion 13 extending from the upper end portion 11a, which is an end portion, to the inner peripheral side (direction of arrow c). The outer peripheral surface 12d of the outer peripheral convex portion 12 is inclined toward the inner peripheral side (arrow c direction) toward the lower side (arrow b direction) on one side. The outer peripheral convex portion 12 is an annular flange extending from the lower end portion 11b of the tubular portion 11 to the outer peripheral side. Further, the reinforcing ring 10 is formed with a plurality of groove portions 14 extending from the outer peripheral surface 12d of the outer peripheral convex portion 12 to the tubular portion 11 at equal intervals.

Specifically, the tubular portion 11 extends parallel to or substantially parallel to the axis Y1 direction, and is formed in a cylindrical or substantially cylindrical shape around the axis Y1. In the tubular portion 11, most of the upper end portion 11a and the outer peripheral surface 11d, which are the upper ends (direction of arrow a) of the tubular portion 11, are embedded in the elastic body portion 20, and a part of the outer peripheral surface 11d. , Most of the inner peripheral surface 11c and the outer peripheral convex portion 12 are exposed from the elastic body portion 20. The inner peripheral flange portion 13 is an annular or substantially annular flange extending parallel to or substantially parallel to the radial direction and extending from the upper end portion 11a of the tubular portion 11 to the inner peripheral side (direction of arrow c). The inner peripheral flange portion 13 is embedded in the elastic body portion 20.

The outer peripheral convex portion 12 extends parallel to or substantially parallel to the radial direction, and extends from the lower end portion 11b, which is the lower end (arrow b direction) of the tubular portion 11, to the outer peripheral side (arrow d direction). An annular or substantially annular flange. The outer peripheral surface 12d of the outer peripheral convex portion 12 extends obliquely from the upper surface 12a of the outer peripheral convex portion 12 toward the lower surface 12b toward the inner peripheral side (direction of arrow c).

A plurality of groove portions 14 extend from the outer peripheral surface 12d of the outer peripheral convex portion 12 to the tubular portion 11 at equal intervals. Specifically, the groove portion 14 extends from the outer peripheral surface 12d of the outer peripheral convex portion 12 toward the inner peripheral side (arrow c direction) in parallel or substantially parallel to the radial direction, and then the lower end portion 11b of the tubular portion 11. It is a rectangular or substantially rectangular groove extending from the upper side (in the direction of arrow a) in parallel or substantially parallel to the axis Y1 direction. The groove portions 14 are formed, for example, in an L-shape or a substantially L-shape in a cross-sectional view, and are concentrically or substantially concentric from the axis Y1 at equiangular intervals or substantially equiangular intervals (for example, eight, in FIG. 1). 2) are formed.

The elastic body portion 20 has an outer peripheral side elastic body portion 21 on the outer peripheral surface 11d of the tubular portion 11 of the reinforcing ring 10, and is from the upper end portion (direction of arrow a) to the inner peripheral side (arrow) of the tubular portion 11. It has an annular seal lip portion 22 that extends downward (in the direction of arrow b) toward the c direction. Further, the elastic body portion 20 has an annular outer peripheral lip portion 26 extending from the outer peripheral surface 21d of the outer peripheral side elastic body portion 21 to the outer peripheral side (direction of arrow d).

Specifically, the outer peripheral side elastic body portion 21 extends parallel to or substantially parallel to the axis Y1 direction, and is formed in a cylindrical shape or a substantially cylindrical shape around the axis Y1. The outer peripheral side elastic body portion 21 covers most of the upper end portion 11a and the outer peripheral surface 11d of the tubular portion 11, and covers a part of the outer peripheral surface 11d, most of the inner peripheral surface 11c, and the outer peripheral convex portion 12. Not covered. The outer peripheral lip portion 26 is an annular or substantially annular lip protruding from the central portion of the outer peripheral surface 21d, which is the outer peripheral side (direction of the arrow d) of the outer peripheral side elastic body portion 21, to the outer peripheral side.

The seal lip portion 22 has a truncated cone shape or substantially extends downward (arrow b direction) from the inner peripheral flange portion 13 provided at the upper end portion 11a of the tubular portion 11 toward the inner peripheral side (arrow c direction). It has a truncated cone-shaped lip raising portion 23 and a lip tip portion 24 connected to the lip raising portion 23. The lip tip portion 24 is a wedge-shaped annular lip whose cross-sectional shape is convex toward the inner peripheral side (direction of arrow c), and is slidably formed on the outer peripheral surface 110d of the plug tube 110 described later. It is formed to be in close contact and is attached so as to seal between the plug tube 110 and the housing 100. Further, a garter spring 25 that presses the lip tip portion 24 toward the inner peripheral side (arrow c direction) in the radial direction is fitted on the outer peripheral side (arrow d direction) of the lip tip portion 24.

In addition to this configuration, a gap C is formed in the sealing device 1 between the outer peripheral convex portion 12 and the outer peripheral side elastic body portion 21 so that the housing 100 fits into the outer peripheral convex portion 12. Specifically, the gap C is an annular or substantially annular groove recessed from the outer peripheral surface 21d of the outer peripheral side elastic body portion 21 toward the center side. In the gap C, a part of the outer peripheral surface 11d of the tubular portion 11 is defined as a bottom surface, the lower surface 21b of the outer peripheral side elastic body portion 21 is defined as an upper side surface, and the upper surface 12a of the outer peripheral convex portion 12 is defined. Is defined as the lower side surface. The gap C can be fitted to the flange portion 102 of the housing 100, which will be described later, in the assembled state when the sealing device 1 is assembled.

Subsequently, an assembling method for assembling the sealing device 1 will be described. FIG. 2 is a cross-sectional view showing a sealing structure 120 in which the sealing device 1 according to the embodiment of the present invention is assembled between the plug tube 110 to be sealed and the housing 100. The sealing structure 120 is configured by assembling the sealing device 1 in the annular gap between the plug tube 110 and the housing 100 having the opening 101 into which the plug tube 110 is inserted, and the plug tube 110 and the housing 100. The annular gap between them is sealed.

The plug tube 110 extends parallel to or substantially parallel to the axis Y1 direction, and is formed in the shape of a cylindrical rod or a substantially cylindrical rod. The plug tube 110 is rotatable relative to the housing 100, and the housing 100 is arranged on the outer peripheral side (arrow d direction) of the plug tube 110. The housing 100 has a cylindrical or substantially cylindrical opening 101 formed around the axis Y1.

A plug tube 110 is inserted into the opening 101 of the housing 100, and the inner peripheral surface 101c, which is the inner peripheral side (arrow c direction) of the opening 101, and the outer peripheral side (arrow d direction) of the plug tube 110. An annular space is formed between the surface and the outer peripheral surface 110d. The lower end portion 100b of the housing 100 is provided with an annular or substantially annular flange portion 102 extending from the inner peripheral surface 101c of the opening 101 to the inner peripheral side (direction of arrow c) in parallel or substantially parallel to the radial direction. Has been done.

That is, the housing 100 has an accommodating portion 103 for accommodating the sealing device 1. The accommodating portion 103 is recessed from the upper surface 100a, which is the upper surface (arrow a direction) of the housing 100, to the lower side (arrow b direction).

Regarding the assembling method when assembling the sealing device 1, first, the sealing device 1 is moved from the upper side (arrow a direction) to the lower side (arrow b direction) of the housing 100 and inserted into the accommodating portion 103. When the sealing device 1 is inserted into the housing portion 103, the lip tip portion 24 of the sealing device 1 is brought into contact with the outer peripheral surface 110d of the plug tube 110 and press-fitted into the plug tube 110, and the elastic body portion of the sealing device 1 is inserted. The outer peripheral lip portion 26 of 20 is brought into contact with the inner peripheral surface 101c of the opening 101 of the housing 100 and press-fitted into the opening 101.

After that, when the sealing device 1 is further moved to the lower side of the housing 100, the outer peripheral convex portion 12 of the sealing device 1 is brought into contact with the flange portion 102 of the housing 100, and the outer peripheral convex portion 12 is on the inner peripheral side (direction of arrow c). ) Transforms. At this time, since the outer peripheral surface 12d of the outer peripheral convex portion 12 of the sealing device 1 is inclined toward the inner peripheral side toward the lower side (direction of arrow b), the outer peripheral convex portion 12 is formed on the inner circumference when the sealing device 1 is assembled. It can be easily deformed to the side, and the load when assembling the sealing device 1 can be suppressed. Further, since the reinforcing ring 10 is formed with a plurality of groove portions 14 extending from the outer peripheral surface 12d of the outer peripheral convex portion 12 to the tubular portion 11 at equal intervals, it is possible to suppress the load when assembling the sealing device 1. It is possible to improve the assembling property when assembling the sealing device 1.

After that, when the sealing device 1 was further moved to the lower side of the housing 100, the outer peripheral convex portion 12 of the sealing device 1 was moved to the lower side of the flange portion 102 of the housing 100 and was deformed to the inner peripheral side. The outer peripheral convex portion 12 returns to its original position, and the flange portion 102 of the housing 100 fits into the gap C of the sealing device 1. In this case, the upper surface of the flange portion 102 is in contact with the lower surface 21b of the outer peripheral elastic body portion 21, and the lower surface of the flange portion 102 is in contact with the upper surface 12a of the outer peripheral convex portion 12. In this way, since the gap C of the sealing device 1 fits with the flange portion 102 of the housing 100, it is possible to further prevent the sealing device 1 from being tilted and assembled to the housing 100, and the sealing device 1 is the housing. It is possible to further suppress the simple removal from 100.

After that, when the flange portion 102 of the housing 100 is fitted into the gap C of the sealing device 1, the lip tip portion 24 of the sealing device 1 is brought into close contact with the outer peripheral surface 110d of the plug tube 110, and the elastic body of the sealing device 1 is brought into close contact with the outer peripheral surface 110d. The outer peripheral lip portion 26 of the portion 20 is brought into close contact with the inner peripheral surface 101c of the opening 101 of the housing 100. As a result, the sealing device 1 can seal the annular gap between the plug tube 110 and the housing 100 having the opening 101 into which the plug tube 110 is inserted.

In this way, in the sealing device 1, the reinforcing ring 10 has an outer peripheral convex portion 12 extending from the lower end portion 11b of the tubular portion 11 to the outer peripheral side, and the elastic body portion 20 is the reinforcing ring 10. The outer peripheral side elastic body portion 21 is provided on the outer peripheral surface 11d of the tubular portion 11, and the housing 100 is fitted to the outer peripheral convex portion 12 between the outer peripheral convex portion 12 and the outer peripheral side elastic body portion 21. A gap C is formed in the air. Therefore, since the gap C of the sealing device 1 fits with the flange portion 102 of the housing 100, it is possible to further prevent the sealing device 1 from being tilted and assembled to the housing 100, and the sealing device 1 is attached to the housing 100. It can be further suppressed from being easily removed from the housing.

Further, the sealing structure 120 includes a plug tube 110, a housing 100, and a sealing device 1, and the flange portion 102 of the housing 100 is fitted into the gap C of the sealing device 1. Therefore, it is possible to further prevent the sealing device 1 from being tilted and assembled to the housing 100, and it is possible to further prevent the sealing device 1 from being easily removed from the housing 100.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all aspects included in the concept of the present invention and the scope of claims. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. Further, for example, the shape, material, arrangement, size, etc. of each component in the above embodiment can be appropriately changed depending on the specific usage mode of the present invention.

For example, in the sealing device 1 according to the embodiment of the present invention, the reinforcing ring 10 has an outer peripheral convex portion 12 extending from the lower end portion 11b of the tubular portion 11 to the outer peripheral side, and the reinforcing ring 10 has an outer circumference. An embodiment of the present invention has been described as an example in which a plurality of groove portions 14 extending from the outer peripheral surface 12d of the convex portion 12 to the tubular portion 11 are formed at equal intervals. However, the present invention is not limited to this, and the outer peripheral protrusion 12 may be at least one outer peripheral protrusion, so that the housing 100 fits in the outer peripheral protrusion between the outer peripheral protrusion and the outer peripheral side elastic body portion 21. , The gap C may be formed.

1 ... Sealing device, 2 ... Opening, 10 ... Reinforcing ring, 11 ... Cylindrical part, 11a ... Upper end part, 11b ... Lower end part, 11c ... Inner peripheral surface, 11d ... Outer peripheral surface, 12 ... Outer peripheral convex part , 12a ... upper surface, 12b ... lower surface, 12d ... outer peripheral surface, 13 ... inner peripheral flange portion, 14 ... groove portion, 20 ... elastic body portion, 21 ... outer peripheral side elastic body portion, 21b ... lower surface, 21d ... outer peripheral surface, 22 ... Seal lip part, 23 ... lip rising part, 24 ... lip tip part, 25 ... garter spring, 26 ... outer peripheral lip part, 100 ... housing, 100a ... upper surface, 100b ... lower end part, 101 ... opening, 101c ... Inner peripheral surface, 102 ... Flange part, 103 ... Housing part, 110 ... Plug tube, 110d ... Outer surface surface, 120 ... Sealed structure, C ... Gap, Y1 ... Axial line

Claims (6)

A sealing device that seals an annular gap between a shaft and a housing having an opening into which the shaft is inserted.
An annular reinforcing ring around the axis and
An annular elastic body portion is provided around the axis formed from the elastic body attached to the reinforcing ring.
The reinforcing ring has a tubular portion and an outer peripheral convex portion extending from one end of the tubular portion to the outer peripheral side.
The elastic body portion has an outer peripheral side elastic body portion on the outer peripheral surface of the tubular portion of the reinforcing ring.
A sealing device characterized in that a gap is formed between the outer peripheral convex portion and the outer peripheral side elastic body portion so that the housing fits into the outer peripheral convex portion. The sealing device according to claim 1, wherein the outer peripheral surface of the outer peripheral convex portion is inclined toward the inner peripheral side toward one side. The outer peripheral convex portion is an annular flange extending from one end of the tubular portion to the outer peripheral side.
The sealing device according to claim 1 or 2, wherein a plurality of grooves extending from the outer peripheral surface of the outer peripheral convex portion to the tubular portion are formed on the reinforcing ring at equal intervals. The reinforcing ring has an annular inner peripheral flange portion extending from the other side end portion of the tubular portion to the inner peripheral side.
Any one of claims 1 to 3, wherein the elastic body portion has an annular seal lip portion extending to one side from the other side end portion of the tubular portion toward the inner peripheral side. The sealing device according to the item. The sealing device according to any one of claims 1 to 4, wherein the elastic body portion has an annular outer peripheral lip portion extending from the outer peripheral surface of the outer peripheral side elastic body portion to the outer peripheral side. Axis and
A housing having an opening into which the shaft is inserted
A sealing structure comprising a sealing device for sealing an annular gap between the shaft and the housing.
The sealing device is
An annular reinforcing ring around the axis and
An annular elastic body portion is provided around the axis formed from the elastic body attached to the reinforcing ring.
The reinforcing ring has a tubular portion and an outer peripheral convex portion extending from one end of the tubular portion to the outer peripheral side.
The elastic body portion has an outer peripheral side elastic body portion on the outer peripheral surface of the tubular portion of the reinforcing ring.
A gap is formed between the outer peripheral convex portion and the outer peripheral side elastic body portion so that the housing fits into the outer peripheral convex portion.
The housing has a flange portion extending inward from one end of the housing.
A sealing structure characterized in that the flange portion of the housing is fitted into the gap of the sealing device.

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