JP7285683B2 - Sealing device and sealing structure - Google Patents

Description

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

For example, in a vehicle engine, a through hole is provided in a front cover of the engine that covers accessories and a timing chain attached to the side of a crankcase. The end of the crankshaft protrudes outside from the through hole of the front cover. A torsional damper is attached to the end of the crankshaft. An annular space is formed between the through hole of the front cover and the end of the crankshaft or the boss of the torsional damper, and an oil seal is used as a sealing device to seal this space. It is The oil seal is fixed to the front cover by being press-fitted into the through-hole of the front cover and compressing the rubber material on the outer peripheral side (see Patent Document 1, for example).

In recent years, efforts have been made to reduce the weight of vehicles for reasons such as improving fuel efficiency. Engines mounted on vehicles are also being lightened, and front covers, which are parts of the engines, are also required to be lightened. Conventional engine front covers are made of metal such as aluminum alloy.

JP-A-7-55015

By the way, a resin molded product has a large dimensional tolerance. In addition, resin moldings have a large coefficient of thermal expansion and a large amount of creep deformation. Therefore, when a resin front cover is used in an engine, there is a concern that a gap may be formed between the oil seal press-fitted into the through hole and the front cover. In particular, due to the difference in coefficient of thermal expansion between the rubber material of the oil seal and the resin material of the front cover, when the front cover thermally expands, the inner peripheral surface of the through-hole of the front cover and the outer peripheral surface of the oil seal Gaps may form between them.

As described above, there has been a demand for a sealing structure for a resin cover such as a resin engine front cover that can maintain sealing performance regardless of the operating conditions such as the ambient temperature.

SUMMARY OF THE INVENTION 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 maintaining sealing performance regardless of the state of use.

In order to achieve the above object, a sealing device according to the present invention is provided with a through-hole through which a shaft portion is inserted, and is fixed to a housing made of resin by a fixing component, thereby providing a seal between the through-hole and the shaft portion. A sealing device for sealing a gap, comprising: an annular reinforcing ring around an axis; an elastic body portion attached to the reinforcing ring and formed of an elastic body annular around the axis; a pressing member for pressing the body portion against the housing, wherein the reinforcing ring includes a cylindrical portion extending in the axial direction and a hollow portion extending from an outer end of the cylindrical portion toward the inner peripheral side. a disc-shaped disc portion, wherein the elastic body portion includes an annular seal lip that slidably contacts the shaft portion; and a protrusion provided on the cover and protruding outward in the axial direction and capable of contacting the housing, wherein the pressing member is connected to the fixed part. An elastic force is exerted between the elastic body portion and the cover portion to press the cover portion against the housing.

In the sealing device according to one aspect of the present invention, the pressing member is provided inside and on the inner peripheral side of the reinforcing ring, and the sealing device is provided on the inner and inner peripheral side of the reinforcing ring. and a holding portion for holding the position of the pressing member.

In the sealing device according to one aspect of the present invention, the holding portion is provided on the elastic body portion.

In a sealing device according to an aspect of the present invention, the holding portion is provided so as to extend outward in the axial direction from the fixed component.

In the sealing device according to one aspect of the present invention, the housing has a convex portion that protrudes inward in the axial direction, and the cover portion is concave inward in the axial direction at a position corresponding to the convex portion. of recesses.

In the sealing device according to one aspect of the present invention, the pressing member is a coil spring having a compression direction in the axial direction.

In order to achieve the above object, a sealing structure according to the present invention comprises a resin housing provided with a through hole through which a shaft portion is inserted, and a sealing structure between the through hole and the shaft portion. a sealing device and a fixing part for fixing the sealing device to the housing, the sealing device comprising: a reinforcing ring annular about an axis; and an elastic body attached to the reinforcing ring and annular about the axis and a pressing member for pressing the elastic body against the housing in the axial direction. The reinforcing ring includes a cylindrical portion extending in the axial direction, and the cylindrical portion a hollow disk-shaped disk portion extending toward the inner peripheral side from an outer end portion of the elastic body portion; a cover portion that is attached to the disk portion from the outside and that is annular around the axis and faces the outside; and a protrusion that is provided on the cover portion and protrudes outward in the axial direction so as to contact the housing. , wherein the pressing member exerts an elastic force between the fixed part and the elastic body portion to press the cover portion against the housing.

According to the sealing device and sealing structure of the present invention, sealing performance can be maintained regardless of the state of use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view taken along an axis line for showing a schematic configuration of a sealing structure provided with a sealing device according to a first embodiment of the present invention; FIG. 2 is a partial cross-sectional view taken along an axial line showing the state of use of the sealing device and the sealing structure shown in FIG. 1; FIG. 10 is a partial cross-sectional view taken along an axis line for showing a schematic configuration of a sealing structure provided with a sealing device according to a second embodiment of the present invention; FIG. 11 is a partial cross-sectional view taken along an axial line for showing a schematic configuration of a sealing structure provided with a sealing device according to a third embodiment of the present invention; FIG. 11 is a partial cross-sectional view taken along an axial line for showing a schematic configuration of a sealing structure provided with a sealing device according to a fourth embodiment of the present invention;

<First Embodiment>
A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view taken along an axial line for showing a schematic configuration of a sealing structure 1 having a sealing device 2 according to a first embodiment of the present invention. FIG. 2 is a partial cross-sectional view taken along the axis showing the state of use of the sealing device 2 and the sealing structure 1. As shown in FIG. Hereinafter, for convenience of explanation, the direction of arrow a (see FIG. 1) is defined as the outside in the direction of the axis x, and the direction of arrow b (see FIG. 1) is defined as the inside in the direction of axis x. More specifically, the outer side is the direction away from the inside of the housing 40 and the inner side is the direction closer to the inside of the housing 40 . In a direction perpendicular to the axis x (hereinafter also referred to as “radial direction”), the direction away from the axis x (the direction of arrow c in FIG. 1) is defined as the outer peripheral side, and the direction approaching the axis x (arrow d in FIG. 1) direction) is the inner circumference side.

As shown in FIGS. 1 and 2, the sealing structure 1 is a resin housing 40 provided with a through hole 41 through which the shaft portion 14 is inserted, and seals between the through hole 41 and the shaft portion 14. and a fixing part 5 for fixing the sealing device 2 to the housing 40 . The sealing device 2 includes an annular reinforcing ring 20 around the axis x, an elastic body portion 30 attached to the reinforcing ring 20 and formed of an annular elastic body around the axis x, and an elastic body portion 30 in the direction of the axis x. and a pressing member 50 for pressing against the housing 40 . The reinforcing ring 20 has a cylindrical portion 21 extending in the direction of the axis x, and a hollow disc-shaped disc portion 24 extending from the end of the outer side a of the cylindrical portion 21 toward the inner peripheral side d. The elastic body portion 30 includes an annular seal lip 36 that slidably contacts the shaft portion 14, and a cover that is attached to the disk portion 24 from the outside a and is annular around the axis x and faces the outside a. and a projecting portion 332 which is provided on the cover portion 33 and protrudes outward a in the direction of the axis x and is capable of coming into contact with the housing 40 . The pressing member 50 exerts an elastic force between the fixed component 5 and the elastic body portion 30 to press the cover portion 33 against the housing 40 . Hereinafter, a sealing device 2 according to an embodiment of the present invention and a sealing structure 1 including this sealing device 2 will be specifically described.

The sealing structure 1 according to the embodiment of the present invention includes, for example, a housing 40 such as a resin front cover of an engine used in a vehicle or a general-purpose machine, a torsional damper, a boss portion of the torsional damper, and the like. and the sealing device 2 for sealing the annular space between the shaft portion 14 and the through hole of the front cover.

A torsional damper (damper pulley) is bolted to one end of the crankshaft of the engine. The damper pulley includes a hub, a pulley as a mass body, and a damper elastic body arranged between the hub and the pulley. The hub is an annular member centered on the axis x, and includes a boss portion as the shaft portion 14 on the inner peripheral side, a rim portion on the outer peripheral side, and a substantially disc-shaped disk portion connecting the boss portion and the rim portion. and The hub is manufactured, for example, by casting from a metal material.

The housing 40 has a through hole 41 , a peripheral surface portion 42 and a side surface portion 43 . The peripheral surface portion 42 has an inner peripheral surface 421 that accommodates the sealing device 2 and is annularly formed around the axis x. The side surface portion 43 is a portion that covers the outside of the housing 40, and is provided with a through hole 41 passing through an inner surface 431 of the outer side a and the inner side b and through which the shaft portion 14 is inserted. The shaft portion 14 , which is the boss portion of the crankshaft and the damper pulley, is inserted through the through hole 41 .

As described above, the housing 40 is made of resin, and examples of resin materials used include synthetic resins such as polyamide, polyester, polypropylene, and ABS resin.

When attached to the crankshaft, the shaft portion 14 is inserted through the inner peripheral surface 421 of the housing 40, and the outer peripheral surface 14b of the shaft portion 14, the through hole 41 of the housing 40, and the inner peripheral surface of the housing 40 are in contact with each other. 421, an annular space (gap g1) is formed. The gap g1 is sealed by the sealing device 2 attached to the housing 40. As shown in FIG.

The fixed part 5 covers the space surrounded by the inner peripheral surface 421 and the inner surface 431 of the housing 40 from the inside b. The fixed component 5 is provided with a through hole through which the shaft portion 14 is inserted. A shaft portion 14, which is a boss portion of the crankshaft and the damper pulley, is inserted through the through hole.

The sealing device 2 includes, for example, a metal reinforcing ring 20, an elastic body portion 30 formed of an elastic body attached to the reinforcing ring 20, and a pressing member 50 that presses the elastic body portion 30 against the housing 40 in the direction of the axis x. and

The reinforcing ring 20 is, as shown in FIG. 1, an annular metal member centered or substantially centered on the axis x. Examples of metal members used for the reinforcing ring 20 include stainless steel and SPCC (cold rolled steel). The reinforcing ring 20 is manufactured by, for example, pressing or forging such a metal member. The reinforcement ring 20 includes, for example, a cylindrical portion 21 which is a cylindrical or substantially cylindrical portion extending in the direction of the axis x, and a hollow disk-like portion extending from the end of the outer side a of the cylindrical portion 21 toward the inner peripheral side d. and a disc portion 24 .

The cylindrical portion 21 is formed so that the sealing device 2 can be fitted to an inner peripheral surface 421 formed on the housing 40 as will be described later. The cylindrical portion 21 can be fitted in contact with the inner peripheral surface 421 of the housing 40 having the through hole 41 via the elastic portion 30 . The cylindrical portion 21 may be shaped to form a conical ring portion (not shown) in the middle portion of the cylindrical portion 21 . The cylindrical portion 21 is aligned with the inner peripheral surface 421 so that the axis x of the sealing device 2 and the axis x of the shaft portion 14 are aligned when the sealing device 2 is fitted to the inner peripheral surface 421 of the housing 40 . be fitted.

An elastic member 30 is attached to the reinforcing ring 20 so as to wrap the reinforcing ring 20 from the outside (in the direction of arrow a) and from the outer peripheral side (in the direction of arrow c). That is, the reinforcing ring 20 reinforces the elastic body portion 30 .

As described above, the elastic body portion 30 is attached to the reinforcing ring 20 and formed integrally with the reinforcing ring 20 so as to cover the reinforcing ring 20 . Examples of the elastic body of the elastic body portion 30 include various rubber materials. Examples of various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluorine rubber (FKM). The elastic body portion 30 is molded by cross-linking (vulcanization) molding using a molding die. At the time of this cross-linking molding, the reinforcing ring 20 is placed in a mold, the elastic body portion 30 is adhered to the reinforcing ring 20 by cross-linking adhesion, and the elastic body portion 30 and the reinforcing ring 20 are integrally molded. be done.

The elastic body portion 30 is attached to the base portion 31 located near the end portion of the disk portion 24 on the inner peripheral side (direction of arrow d) of the reinforcing ring 20 and the cylindrical portion 21 of the reinforcing ring 20 from the outer peripheral side (direction of arrow c). a gasket portion 32 that is a portion that is attached to the base portion 31 and the gasket portion 32; A dust lip that extends toward the inner circumference (arrow d direction) and the outer circumference (arrow a direction) in the direction of the axis x, and has a tip portion whose diameter decreases toward the inner circumference d in the direction of the axis x. 34, a holding portion 35 provided on the inner side b and the inner peripheral side d of the reinforcing ring 20 to hold the position of the pressing member 50, and a holding portion 35 extending inward (in the direction of arrow b) from the base portion 31 along the axis x and It has a seal lip 36 formed with a lip tip portion 361 protruding to the peripheral side (in the direction of arrow d), and an inner peripheral surface 37 which is an annular surface facing the inner peripheral side of the elastic body portion 30 .

The base portion 31 supports the seal lip 36 so as to be in sliding contact with the outer peripheral surface 14b of the shaft portion 14 while being pressed against the outer peripheral surface 14b. The base portion 31 is located between the cover portion 33 and the dust lip 34 in the vicinity of the end portion of the disk portion 24 on the inner circumference d side. The disc portion 24 of the reinforcing ring 20 is recessed inside the base portion 31 .

The gasket portion 32 is a portion of the elastic body portion 30 that covers the cylindrical portion 21 of the reinforcing ring 20 from the outer peripheral side c. The outer diameter of the gasket portion 32 is the same as or slightly larger than the inner diameter of the inner peripheral surface 421 . Therefore, when the sealing device 2 is fitted to the inner peripheral surface 421 of the housing 40 , the gasket portion 32 is radially compressed between the cylindrical portion 21 of the reinforcing ring 20 and the housing 40 , and the inner peripheral surface 421 of the housing 40 is compressed. The space between the peripheral surface 421 and the cylindrical portion 21 of the reinforcing ring 20 is sealed.

Note that the gasket portion 32 is not limited to covering the entire outer peripheral side c of the cylindrical portion 21 as shown in FIGS. 1 and 2 . For example, the gasket portion 32 may cover a portion of the outer peripheral side c of the cylindrical portion 21 .

The cover portion 33 is attached to the disc portion 24 from the outside a as described above, and is provided in a ring shape around the axis x so as to face the outside a. For this reason, the cover portion 33 is formed in a disc shape. The cover portion 33 is provided with a projection portion 332 and a recess portion 333 on an outer side surface 331 that faces the outside a.

One or a plurality of projections 332 are provided in an annular shape on the outer side surface 331 of the cover portion 33 and are bead-shaped portions projecting outward a in the direction of the axis x. The protrusion 332 can contact the inner surface 431 of the side surface 43 of the housing 40 . The cross-sectional shape of the protrusion 332 is, for example, triangular as shown in FIGS. 1 and 2 .

The recessed portion 333 is a recessed portion provided on the outer side surface 331 of the cover portion 33, and is, for example, an even distribution groove formed when the elastic body portion 30 is molded.

At least one dust lip 34 is provided so as to extend obliquely from the base portion 31 toward the outer peripheral surface 14b of the shaft portion 14 shown in FIG. Specifically, the dust lip 34 has a tapered cross section extending from both the outer side a and the inner side b of the base 31 toward the inner peripheral side d and the outer side a in the direction of the axis x. have.

The holding portion 35 is an annular portion formed in a portion extending toward the outer peripheral side c from the base portion 31 so as to extend inward b in the direction of the axis x. The holding portion 35 is provided on the inner peripheral side d of the reinforcing ring 20 in the sealing device 2 and further on the inner peripheral side d when viewed from the position where the pressing member 50 is arranged. The holding part 35 holds the pressing member 50 so that the position of the pressing member 50 provided on the inner peripheral side d of the reinforcing ring 20 does not move.

The seal lip 36 is formed at the tip extending along the axis x from the base portion 31 of the elastic body portion 30 so that the outer peripheral surface 14b of the shaft portion 14 can slide. The seal lip 36 has a conical cylindrical shape whose diameter decreases toward the inner peripheral side d as it goes inward (in the direction of the arrow b) in the direction of the axis x. The seal lip 36 is an annular portion having a wedge-shaped cross-section that is convex toward the inner peripheral side (direction of arrow d). That is, in a cross section along the axis x (hereinafter also simply referred to as a cross section), the seal lip 36 has a lip tip portion on the inner side (arrow b direction) and the inner peripheral side (arrow d direction) from the inner peripheral surface 37 of the base 31. 361 obliquely to the axis x. The seal lip 36 has a lip tip portion 361 that comes into slidable contact with the outer peripheral surface 14b of the shaft portion 14 . In addition, the seal lip 36 has a threaded projection projecting toward the inner peripheral side d extending obliquely with respect to the tip of the lip tip portion 361 on the inner peripheral surface 362 extending from the inner peripheral surface 37 toward the lip tip portion 361 . A plurality of protrusions 363 are formed at equal angular intervals in the circumferential direction. The screw projection 363 generates an air flow from the outside a to the inside b when the shaft portion 14 slides, thereby preventing leakage of lubricating oil from the inside b. Note that the elastic body portion 30 may not be provided with the screw projection 363 .

The seal lip 36 is provided with a recess on the outer peripheral side (in the direction of the arrow c) opposite to the lip distal end portion 361, and a garter spring 38, which is an annular elastic member as a strain applying member, is attached to the recess. there is

The garter spring 38 is a spring member made of metal, for example, and urges the seal lip 36 radially inwardly (in the direction of arrow d) to press the seal lip 36 against the outer peripheral surface 14 b of the shaft portion 14 . It gives a sense of urgency. The garter spring 38 is not limited to being made of metal, and may be made of various other materials such as resin as long as it imparts a straining force. Also, the sealing device 2 may not have the garter spring 38 .

The pressing member 50 is arranged on the inner side b and the inner peripheral side d of the reinforcing ring 20 in the sealing device 2 . The pressing member 50 is provided on the outer peripheral side c when viewed from the holding portion 35 of the elastic body portion 30 and on the inner peripheral side d when viewed from the cylindrical portion 21 of the reinforcing ring 20 . The pressing member 50 is an elastic member, such as a coil spring arranged so that the direction of the axis x is the direction of compression. One end of the pressing member 50 contacts the disk portion 24 located inside b of the cover portion 33 and the other end contacts the fixed component 5 on the inner side b and the inner peripheral side d of the reinforcing ring 20 .

Next, the operation of the sealing structure 1 described above will be described.

As shown in FIG. 2 , the sealing structure 1 is housed inside a housing 40 such as a resin front cover of an engine used in a vehicle or a general-purpose machine in a use state, and is mounted on a boss portion of a torsional damper or the like. is applied to the sealing device 2 that seals the annular space between the shaft portion 14 of the housing 40 and the through hole 41 of the housing 40 .

In use, the seal lip 36 and the dust lip 34 of the elastic body 30 are in contact with the outer peripheral surface 14b of the shaft portion 14 at the lip distal end portion 361 and the inner peripheral surface 37 near the distal end portion, respectively. ing. In use, the seal lip 36 of the elastic body portion 30 and the dust lip 34 form a closed space between the inner peripheral surface 37 and the outer peripheral surface 14b of the shaft portion 14 . The seal lip 36 and the dust lip 34 are deformed due to the contact with the outer peripheral surface 14b of the shaft portion 14 . In the state of use, both the seal lip 36 and the dust lip 34 may not be deformed, or one of them may not be deformed. In addition, the dust lip 34 does not have to be in contact with the outer peripheral surface 14b of the shaft portion 14 when in use.

One or a plurality of cover portions 33 are provided in an annular shape on an outer side surface 331 of the cover portion 33 , and protrusions 332 protruding outward a in the direction of the axis x are formed on the inner side surface 431 of the side surface portion 43 of the housing 40 . are in contact with

The pressing member 50 is arranged on the inner side b and the inner peripheral side d of the reinforcing ring 20 in the sealing device 2, so that elastic force is exerted between the fixed part 5 and the elastic body portion 30 to push the cover portion 33. Press against housing 40 . As the pressing member 50 presses the cover portion 33 against the housing 40 in this way, the sealing structure 1 can seal between the inner surface 431 of the housing 40 and the disk portion 24 of the reinforcing ring 20 .

The cover portion 33 and the inner side surface 431 of the housing 40 are sealed together with the projection portion 332 . Specifically, the protrusions 332 of the cover section 33 contact the inner side surface 431 of the housing 40 to seal the outer side surface 331 and the protrusions 332 of the cover section 33 and the inner side surface 431 of the housing 40 . ing. Here, since the projecting portion 332 is an elastic member provided on the cover portion 33 constituting the elastic body portion 30 as described above, the projecting portion 332 is pressed against the inner side surface 431 of the housing 40 to , exerts a sealing function. That is, the sealing device 2 exhibits a sealing action (end face sealing action) with respect to the inner side surface 431 of the housing 40 .

In addition, the pressing member 50 exerts an elastic force between the fixed part 5 and the elastic body portion 30 , so that the projection portion 332 provided on the cover portion 33 is also attached to the inner side surface 431 of the side portion 43 of the housing 40 . pressed. By being pressed against the inner side surface 431 of the housing 40 by the pressing member 50 in this manner, the protrusion 332 can stably maintain the sealing action (end face sealing action) with respect to the inner side surface 431 .

Also, the pressing member 50 exerts an elastic force between the fixed part 5 and the elastic body portion 30 , so that the cover portion 33 and the disk portion 24 of the sealing device 2 are pressed against the inner side surface 431 of the housing 40 . Therefore, according to the sealing structure 1, it is possible to prevent so-called co-rotation, in which the sealing device 2 rotates together with the shaft portion 14 inside the housing 40. As shown in FIG.

In use, the gasket portion 32 is radially compressed between the cylindrical portion 21 of the reinforcing ring 20 and the housing 40 to seal between the inner peripheral surface 421 of the housing 40 and the cylindrical portion 21 of the reinforcing ring 20. . The sealing device 2 seals the annular gap between the inner peripheral surface 421 of the housing 40 and the outer peripheral surface 14 b of the shaft portion 14 by sealing the gap between the gasket portion 32 and the inner peripheral surface 421 of the housing 40 . Here, the pressing member 50 presses the cover portion 33 against the inner side surface 431 of the housing 40 , so that the sealing structure 1 is such that the gasket portion 32 is positioned between the inner peripheral surface 421 of the housing 40 and the cylindrical portion 21 of the reinforcing ring 20 . It is possible to reduce the interference when sealing the. Further, the pressing member 50 presses the cover portion 33 against the inner side surface 431 of the housing 40 , so that the sealing structure 1 can seal between the cover portion 33 and the inner side surface 431 . A gap may be provided between the inner peripheral surface 421 of 40 and the cylindrical portion 21 of the reinforcing ring 20 .

As described above, according to the sealing device 2 and the sealing structure 1, the sealing performance can be maintained regardless of the state of use.

<Second Embodiment>
A second embodiment of the present invention will be described below with reference to the drawings. In the following, structures having the same or similar functions as those of the sealing device 2 and the sealing structure 1 according to the above-described first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted, and only different structures are described. explain.

FIG. 3 is a partial cross-sectional view taken along the axis line for showing a schematic configuration of a sealing structure 1A including a sealing device 2 according to a second embodiment of the present invention. As shown in FIG. 3, the sealing structure 1A differs from the housing 40 of the previously described sealing structure 1 in the structure of the housing 40A.

Like the housing 40, the housing 40A has a through hole 41 and a peripheral surface portion 42, but has a convex portion 432A on the inner side surface 431A of the side surface portion 43A and protruding inward b in the direction of the axis x. The convex portion 432</b>A is provided at a position corresponding to the aforementioned concave portion 333 provided on the outer side surface 331 of the cover portion 33 . In addition, the concave portion 333 is not limited to, for example, an equal distribution groove formed when molding the elastic body portion 30, and may be provided separately from the equal distribution groove.

Since the projection 432A is provided at such a position in the housing 40A, the sealing structure 1A can fit the recess 333 and the projection 432A in use, and the position of the sealing device 2 can be adjusted to the position of the housing 40A. can be fixed inside the Therefore, according to the sealing structure 1A, the fitting of the concave portion 333 and the convex portion 432A in addition to the elastic force of the pressing member 50 causes the sealing device 2 to rotate together with the shaft portion 14 inside the housing 40A. Rotation can be suppressed more effectively.

Further, according to the sealing structure 1A, similarly to the sealing device 2 and the sealing structure 1 described above, it is possible to maintain sealing performance regardless of the state of use.

<Third Embodiment>
A third embodiment of the present invention will be described below with reference to the drawings. Hereinafter, components having the same or similar functions as those of the sealing device 2 and the sealing structure 1 according to the first embodiment and the sealing structure 1A according to the second embodiment are denoted by the same reference numerals. , the description thereof will be omitted, and only the different configurations will be described.

FIG. 4 is a partial cross-sectional view taken along the axis line to show the schematic configuration of a sealing device 2B and a sealing structure 1B according to the third embodiment of the present invention. As shown in FIG. 4, in the sealing structure 1B, the holding portion 51B of the sealing device 2B is provided so as to extend outward a in the direction of the axis x from the fixed component 5B, which is the sealing device described above. 2. It is different from the sealing structure 1 and the sealing structure 1A. The holding portion 51B is provided on the inner peripheral side d of the reinforcing ring 20 in the sealing device 2 and further on the inner peripheral side d when viewed from the position where the pressing member 50 is arranged. With this configuration, the holding portion 51B holds the pressing member 50 so that the pressing member 50 provided on the inner peripheral side d of the reinforcing ring 20 does not move.

Further, according to the sealing device 2B and the sealing structure 1B, similarly to the sealing device 2, the sealing structure 1, and the sealing structure 1A described above, the sealing performance can be maintained regardless of the state of use.

<Fourth Embodiment>
A fourth embodiment of the present invention will be described below with reference to the drawings. Hereinafter, the sealing device 2 and the sealing structure 1 according to the above-described first embodiment, the sealing structure 1A according to the second embodiment, and the sealing device 2B and the sealing structure 1B according to the third embodiment Configurations having the same or similar functions are denoted by the same reference numerals, descriptions thereof are omitted, and only different configurations are described.

FIG. 5 is a partial cross-sectional view taken along an axial line for showing a schematic configuration of a sealing structure 1C provided with a sealing device 2C according to a fourth embodiment of the present invention. As shown in FIG. 5, the sealing structure 1C is provided so that the holding portion 35C of the sealing device 2C extends to the inner peripheral side d from the inner peripheral surface 322 provided on the inner peripheral side d of the gasket portion 32C. is different from the sealing device 2, the sealing structure 1, the sealing structure 1A, the sealing device 2C, and the sealing structure 1B described above. 35 C of holding|maintenance parts are provided in the inner peripheral side d of the reinforcement ring 20 in 2 C of sealing devices, and also the outer peripheral side c seeing from the position where the press member 50 is arrange|positioned. With this configuration, the holding portion 51B holds the pressing member 50 so that the pressing member 50 provided on the inner peripheral side d of the reinforcing ring 20 does not move.

Further, according to the sealing device 2C and the sealing structure 1B, similarly to the sealing device 2, the sealing device 2B, the sealing structure 1, and the sealing structure 1A described above, the sealing performance can be maintained regardless of the state of use. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments of the present invention, and includes all aspects included in the concept of the present invention and the scope of claims. Moreover, each configuration may be selectively combined as appropriate so as to achieve at least part of the above-described problems and effects. For example, the shape, material, arrangement, size, manufacturing method, and the like of each component in the above embodiments can be changed as appropriate according to the specific usage of the present invention.

For example, in the sealing device 2 provided in the sealing structure 1 according to the embodiment of the present invention, the protrusion 332 provided on the outer side surface 331 of the cover portion 33 has a triangular cross-sectional shape. The invention is not limited to this, and may be, for example, a semicircular shape, a square shape, or the like.

For example, in the sealing device 2 included in the sealing structure 1 according to the embodiment of the present invention, the elastic body portion 30 has the dust lip 34 as at least one dust lip, but the present invention is limited to this. not. The elastic member 30 may have two dust lip 34 and an inner dust lip on the inner side b. In this case, the inner dust lip, like the dust lip 34, is located inside b of the dust lip 34 and is located on the inner peripheral surface 37 between the edge of the outer side a of the lip tip portion 361 of the seal lip 36 and the base portion 31. It may extend obliquely toward the inner peripheral side from the outer side, and may have, for example, a conical cylindrical shape or a substantially conical cylindrical shape. In addition to the inner dust lip and the dust lip 34, the elastic member 30 has other dust lip, and may have three or more dust lip.

In addition, in the embodiment described above, the holding portion 35, the holding portion 51B, and the holding portion 35C are individually provided in the sealing device 2, the sealing device 2B, and the sealing device 2C, respectively. However, the sealing device of the present invention is not limited to these, and at least two of the holding portion 35, the holding portion 51B, and the holding portion 35C may be combined in one sealing device.

In the above-described embodiment, the present invention is applied to the sealing structure of the front cover of the engine, but the resin housing of the present invention is not limited to the front cover of the engine. may be a housing made of The sealing device 2 according to the present invention is not limited to the sealing structures 1, 1A, 1B, and 1C described above in terms of the configuration of the sealing structure. can be applied to the sealing structure of The resin housing of the present invention includes, for example, a resin cover for a transmission of an automobile, a resin cover for a differential mechanism of an automobile, a resin cover for a steering mechanism, a resin cover for a motor, and a speed reducer. It may be a resin cover or the like. In order to seal a gap between a shaft portion that performs rotational motion, reciprocating motion, etc. and a resin housing having a space through which the shaft portion is inserted, the gap between the shaft portion and the resin housing is: The present invention can be applied.

1 sealing structure 2 sealing device 5 fixed part 14 shaft portion 14b outer peripheral surface 20 reinforcing ring 21 cylindrical portion 24 disk portion 30 elastic body portion 31 base portion 32 gasket portion 33 cover portion 34 dust lip 35 holding portion 36 seal lip 37 inner peripheral surface 38 Garter spring 40 housing 41 through hole 42 peripheral surface 43 side surface 50 pressing member 322 inner peripheral surface 331 outer surface 332 protrusion 333 recess 361 lip tip 362 inner peripheral surface 363 screw protrusion 421 inner peripheral surface 431 inner surface

Claims (7)

A sealing device that seals between the through-hole and the shaft portion by being fixed by a fixing component to a resin housing provided with a through-hole through which the shaft portion is inserted,
a reinforcing ring annular about the axis;
an elastic body portion attached to the reinforcing ring and formed of an elastic body annular around the axis;
a pressing member that presses the elastic body portion against the housing in the axial direction;
has
The reinforcing ring has a cylindrical portion extending in the axial direction, and a hollow disk-shaped disk portion extending from an outer end portion of the cylindrical portion toward the inner peripheral side,
The elastic body portion includes an annular seal lip slidably contacting the shaft portion, a cover portion attached to the disk portion from the outside and annular around the axis and facing the outside, a projecting portion provided on the cover portion, projecting outward in the axial direction and capable of coming into contact with the housing;
The pressing member exerts an elastic force between the fixed part and the elastic body portion to press the cover portion against the housing.
sealing device. The pressing member is provided inside and on the inner peripheral side of the reinforcing ring,
The sealing device includes a holding portion provided inside and on the inner peripheral side of the reinforcing ring and holding the position of the pressing member,
A sealing device according to claim 1 . The holding portion is provided on the elastic body portion,
The sealing device according to claim 2. The holding portion is provided to extend outward in the axial direction from the fixed component,
The sealing device according to claim 2. The housing has a convex portion that protrudes inward in the axial direction,
The cover portion has a recessed portion that is recessed inwardly in the axial direction at a position corresponding to the convex portion.
A sealing device according to any one of claims 1 to 4. The pressing member is a coil spring whose compression direction is the axial direction,
A sealing device according to any one of claims 1 to 5. A resin housing provided with a through-hole through which the shaft is inserted, a sealing device for sealing between the through-hole and the shaft, and a fixing part for fixing the sealing device to the housing. ,
with
The sealing device is
a reinforcing ring annular about the axis;
an elastic body portion attached to the reinforcing ring and formed of an elastic body annular around the axis;
a pressing member that presses the elastic body portion against the housing in the axial direction;
has
The reinforcing ring has a cylindrical portion extending in the axial direction, and a hollow disk-shaped disk portion extending from an outer end portion of the cylindrical portion toward the inner peripheral side,
The elastic body portion includes an annular seal lip slidably contacting the shaft portion, a cover portion attached to the disk portion from the outside and annular around the axis and facing the outside, a projecting portion provided on the cover portion, projecting outward in the axial direction and capable of coming into contact with the housing;
The pressing member exerts an elastic force between the fixing component and the elastic body portion to press the cover portion against the housing.
Hermetically sealed structure.

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