CN110878837A - Sealing means - Google Patents

Abstract

The present invention provides a sealing device, which does not complicate the structure of the casing, and can be used in a usage mode in which two fluids are separated and sealed. Comprising: a reinforcing ring (10) annular around the axis (x); an elastic body part (20) annular around the axis (x), mounted on the reinforcing ring (10), and having a sealing lip formed of the elastomer (21); and an annular slit cover (40) around the axis (x), fitted to the outer peripheral side of the elastic body portion (20), the elastic body portion (20) having a direction along the axis (x) on the outer peripheral side The slit (28) extends and is recessed to the inner peripheral side, and the slit cover (40) covers the slit (28) at intervals in the axis x direction.

Description

Sealing means

technical field

The present invention relates to sealing devices.

Background technique

Conventionally, as a usage form of a sealing device, for example, in an engine, hydraulic oil and engine oil are separated and sealed separately, and there are cases where a portion for separating and sealing the two fluids is present. In this case, there is known an example in which two sealing devices are used in combination as a pair for each type of fluid.

FIG. 7 is a cross-sectional view taken along the axis x, showing a use state of the conventional sealing device 110 for separating and sealing two fluids. As shown in FIG. 7 , as a conventional usage form for separating and sealing two kinds of fluids, there is a case where a pair of sealing devices 110 are arranged and used facing away from each other.

Specifically, the pair of sealing devices 110 are attached to the housing 2 so that the rear cover portion 126 faces each other with the gap 160 interposed therebetween, and seal the gap between the shaft 3 and the through hole 220 of the housing 2 . The conventional sealing device 110 arranged in this way exhibits a suction action by the rotation of the shaft 3 in the use state, and in particular, when the shaft 3 rotates at a high speed, the inside of the gap 160 becomes a negative pressure. When the inside of the gap 160 becomes a negative pressure, the lip front end portion 122 of the seal lip 121 is in strong contact with the shaft 3, and the lip front end portion 122 may be excessively worn. Therefore, conventionally, when the two sealing devices 110 are used in combination as a pair, a discharge passage 210 is formed in the casing 2, and the negative pressure of the gap 160 is removed through the discharge passage 210 for making the gap 160 A through hole open to the outside (for example, refer to Patent Document 1).

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Publication No. 6-40373.

SUMMARY OF THE INVENTION

The problem to be solved by the invention

As described above, in the conventional case where the conventional sealing devices 110 are used as a pair, the gap 160 is provided, and in order to prevent the negative pressure from being generated in the gap 160, it is necessary to provide the discharge passage 210 in the casing 2, so that the structure become complicated. In this way, the two fluids are separated and sealed by the conventional sealing device, so that the structure of the casing 2 becomes complicated.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a sealing device which can be used in a usage form in which two fluids are separated and sealed without complicating the structure of the casing.

means to solve the problem

In order to achieve the above object, the sealing device according to the present invention is characterized in that it comprises: a reinforcing ring in an annular shape around the axis; a sealing lip formed by a body; and a slit cover annularly formed around the axis, fitted to the outer peripheral side of the elastic body portion, the elastic body portion having on the outer peripheral side extending in the direction of the axis and toward the inner circumference A side recessed slit, and the slit cover covers the slit at intervals in the axial direction.

In the sealing device according to one aspect of the present invention, the elastic body portion has a pad portion that covers the reinforcing ring from an outer peripheral side, and the slit is provided in the on the pad part.

In the sealing device according to one aspect of the present invention, the slit cover has an annular outer peripheral portion extending in the axial direction, and a front surface portion extending in the axial direction from the outer peripheral portion. One end portion of the upper portion extends toward the inner peripheral side, the slit cover is fitted over the elastic body portion at the outer peripheral portion, and the front portion covers the slit at intervals in the axial direction.

In the sealing device according to one aspect of the present invention, the front surface portion has a step portion, and the step portion has a dimension different in the radial direction from other portions.

In the sealing device according to one aspect of the present invention, the slit is provided in a range of a half or less in the circumferential direction of the elastic body portion.

effect of invention

According to the sealing device according to the present invention, the structure of the casing is not complicated, and it can be used in a usage mode in which two fluids are separated and sealed.

Description of drawings

FIG. 1 is a front view showing a schematic configuration of a sealing device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a cross-section taken along an axis for showing a schematic configuration of the sealing device shown in FIG. 1 .

FIG. 3 is a cross-sectional view of a cross-section taken along an axis for showing a first use state of the sealing device shown in FIG. 1 .

FIG. 4 is a cross-sectional view of a cross-section along an axis for illustrating a second use state of the sealing device shown in FIG. 1 .

FIG. 5 is a schematic diagram showing the position of the slit with respect to the shaft in the use state of the sealing device shown in FIG. 1 .

6 is a schematic diagram showing an example of an assembling operation of an elastic body portion and a slit cover in the sealing device shown in FIG. 1 .

7 is a cross-sectional view of a cross-section taken along an axis for showing a schematic configuration of a conventional sealing device.

Detailed ways

Hereinafter, a sealing device according to an embodiment of the present invention will be described with reference to the drawings.

Hereinafter, for convenience of description, the direction of arrow a (see FIGS. 1 and 2 ) in the direction of the axis x is referred to as the outer side, and the direction of arrow b (see FIGS. 1 and 2 ) in the direction of the axis x is referred to as the inner side. In addition, in the 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 regarded as the outer peripheral side, and the direction close to the axis x (the direction of the arrow c in FIG. 1 ) is regarded as the outer peripheral side. Arrow d direction) as the inner peripheral side.

FIG. 1 is a front view showing a schematic configuration of a sealing device 1 according to an embodiment of the present invention. In addition, FIG. 2 is a partial cross-sectional view of a cross section along the axis x for showing the schematic configuration of the sealing device 1 shown in FIG. 1 . 1 and 2 , the configuration of the sealing device 1 according to the present embodiment will be described.

As shown in FIGS. 1 and 2 , the sealing device 1 according to the present embodiment includes: a reinforcing ring 10 , which is annular around the axis x; , which is annular around the axis x; and the slit cover 40 is sleeved on the outer peripheral side of the elastic body portion 20 and is annular around the axis x. Further, the elastic body portion 20 has slits 28 extending in the axis x direction and recessed to the inner peripheral side on the outer peripheral side, and the slit cover 40 covers the slits 28 at intervals in the axis x direction. Hereinafter, the structure of the sealing device 1 will be specifically described.

The reinforcing ring 10 is an annular metal member centered on or approximately the axis x, and the shape of the cross-section (hereinafter also simply referred to as "cross-section") along the axis x is L-shaped or substantially L-shaped. The reinforcement ring 10 has, for example, a cylindrical portion 11 that is a cylindrical or substantially cylindrical portion extending in the direction of the axis x, and a disk portion 12 that extends from the outer end of the cylindrical portion 11 to the inner peripheral side. An extended hollow disc-shaped portion.

The elastic body part 20 is attached to the reinforcement ring 10, and is integrally formed with the reinforcement ring 10 so that the whole or substantially the whole of the reinforcement ring 10 may be covered in this embodiment. The elastic body portion 20 has a sealing lip 21 , a lip waist portion 25 and a slit 28 . As will be described later, the seal lip 21 is formed such that its shaft is slidably abutted against a shaft of an engine or the like. The lip waist portion 25 is a portion of the elastic body portion 20 located in the vicinity of the end portion on the inner peripheral side of the disk portion 12 of the reinforcing ring 10 .

Specifically, as shown in FIG. 2 , the seal lip 21 is a portion extending inward from the lip waist portion 25 , and is an annular portion centered or substantially centered on the axis x, and is opposed to the cylindrical portion 11 of the reinforcing ring 10 . form. Specifically, the inner end portion of the seal lip 21 has a wedge-shaped annular lip front end portion 22 whose cross-sectional shape is convex toward the inner peripheral side. Further, on the outer peripheral side of the seal lip 21 , a snap ring 30 is fitted at a position facing away from the lip front end portion 22 . The circlip 30 is accommodated in the accommodating groove 23 , which is an inwardly recessed annular recess formed on the outer peripheral side of the seal lip 21 at a position facing away from the lip front end 22 , and is attached to the seal lip 21 . The snap spring 30 presses the lip tip 22 in the direction toward the axis x, and applies a predetermined amount of tightening force to the shaft so that the lip tip 22 follows the displacement of the shaft. The lip front end portion 22 is in contact with the outer peripheral surface of the shaft, as described later, to achieve sealing between the sealing device 1 and the shaft.

In addition, as shown in FIG. 2 , on the conical surface 22a on the outer side of the lip front end portion 22, a plurality of screw protrusions 22b are formed at equal angular intervals in the circumferential direction, and the screw protrusions 22b are opposite to the lip front end portion. The front end of 22 is a protrusion extending obliquely and protruding toward the inner peripheral side. The threaded protrusion 22b generates an air flow from the outside to the inside when the shaft slides, and prevents leakage of the object to be sealed from the inside. The threaded protrusion 22b may not be provided on the elastic body portion 20 . That is, the screw protrusion 22b functions as a pump.

In addition, the elastic body portion 20 has a rear cover portion 26 , a pad portion 27 , and an inner liner portion 29 . The rear cover portion 26 is a portion that covers the disk portion 12 of the reinforcing ring 10 from the outside, and the lining portion 29 is a portion that covers the reinforcing ring 10 from the inside and the inner peripheral side. The pad portion 27 is a portion of the elastic body portion 20 that covers the cylindrical portion 11 of the reinforcing ring 10 from the outer peripheral side. The pad portion 27 is a portion where the elastic body portion 20 is fitted over the slit cover 40 , and is in contact with a surface (inner peripheral surface 41 a ) on the inner peripheral side of the outer peripheral portion 41 of the slit cover 40 , as will be described later. In the sealing device 1, the packing portion 27 is compressed in the radial direction between the outer peripheral portion 41 of the slit cover 40 and the cylindrical portion 11 of the reinforcing ring 10, and generates a force in the radial direction, that is, a fitting force with a predetermined magnitude. . The radial thickness of the spacer portion 27 is set so that a fitting force of a predetermined magnitude is generated when the spacer portion 27 is pressed into the slit cover 40 .

The slit 28 is provided on the outer peripheral surface (outer peripheral surface 27 a ) of the pad portion 27 of the elastic body portion 20 , and is a portion recessed from the outer peripheral surface 27 a of the pad portion 27 to the inner peripheral side. The slit 28 extends in the axis x direction, for example, over the entire width (width in the axis x direction) of the pad portion 27 in the axis x direction, and is provided so as to penetrate the pad portion 27 between the inner side and the outer side. As shown by the dotted line in FIG. 1 , the shape of the slit 28 as viewed from the front is formed as a groove in a semicircular shape or a substantially semicircular shape, for example, toward the inner peripheral side. The slit 28 has a predetermined depth in the radial direction of the elastic body portion 20 .

As long as the slit 28 is a groove recessed from the outer peripheral surface 27a of the pad portion 27 to the inner peripheral side, the shape of the slit 28 viewed from the front is not limited to the above-mentioned example. In addition, the number of the slits 28 only needs to be provided at least one in the sealing device 1 as shown in the present embodiment, and a plurality of the number of the slits 28 may be provided in the sealing device 1 . Moreover, in the pad part 27 of the elastic body part 20, the slit 28 is provided in the range below the half part of the circumferential direction. For example, in the use state of the sealing device 1 to be described later, the slit 28 is provided in a range on the upper half side in the direction of gravity of the packing portion 27 . For example, the slit 28 is provided downstream in the rotation direction of the shaft 3 within the range of the upper half of the packing portion 27 in the direction of gravity so that the object to be sealed that is rolled up by the rotation of the shaft 3 does not enter the slit 28 . side.

The elastic body portion 20 is integrally formed with an elastic material, and the seal lip 21 , the lip waist portion 25 , the rear cover portion 26 , the cushion portion 27 , and the inner lining portion 29 are each part of the elastic body portion 20 integrally formed with an elastic material.

The metal material of the reinforcing ring 10 is, for example, stainless steel or SPCC (cold rolled steel). In addition, as the elastic body of the elastic body part 20, there are various rubber materials, for example. Examples of various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM). The reinforcing ring 10 is produced by, for example, press working or forging, and the elastic body portion 20 is formed by cross-linking (vulcanization) molding using a molding die. During this cross-linking molding, the reinforcing ring 10 is disposed in the molding die, the elastic body portion 20 is bonded to the reinforcing ring 10 by cross-linking bonding, and the elastic body portion 20 and the reinforcing ring 10 are integrally formed.

As described above, the sealing device 1 also has a slit cover 40 which is annularly shaped around the axis x, which is fitted to the gasket portion 27 of the elastomer portion 20 . The slit cover 40 is formed corresponding to the shape of the sealing device 1 . The slit cover 40 is fitted over the elastic body portion 20 and is formed to cover the slit 28 at intervals in the axis x direction. The slit cover 40 is, for example, an annular member having an axis x as a center or a substantially center, and includes an outer peripheral portion 41 and a front surface portion 42 .

In the slit cover 40 , the outer peripheral portion 41 is a cylindrical or substantially cylindrical portion extending in the axis x direction, and is formed so as to be in close contact with the outer peripheral surface 27 a of the cushion portion 27 of the elastic body portion 20 . Further, the outer peripheral portion 41 has a width in the axis x direction that is larger than the width in the axis x direction of the pad portion 27 . The outer peripheral portion 41 is a portion for fitting the sealing device 1 into a through hole of a member to which the sealing device 1 is attached, such as a housing through which the rotary shaft is inserted, in a use state. Therefore, when the sealing device 1 is press-fitted into the through hole of the attached member, the outer peripheral portion 41 is formed so as to be in close contact with the inner peripheral surface of the through hole, thereby sealing between the sealing device 1 and the through hole.

The front surface portion 42 is a hollow disk-shaped portion extending from the inner end portion of the outer peripheral portion 41 toward the inner peripheral side, and is aligned with the inner end portion (inner end 27b) of the cushion portion 27 of the elastic body portion 20 in the axis x direction. ) are opposed to each other at an interval, and are formed so as to cover the slit 28 from the inside in the axis x direction. The front surface portion 42 extends, for example, in a direction orthogonal to the axis x direction. The front surface portion 42 extends from the inner end portion of the outer peripheral portion 41 to the inner peripheral side to a position covering the slit 28 from the inner side at least in the axis x direction, and the inner peripheral edge portion 43 of the inner peripheral edge portion of the front surface portion 42 is located there. It is located on the inner peripheral side than the slit 28 in the radial direction. For example, as shown in FIG. 2 , the inner peripheral edge portion 43 of the front surface portion 42 extends to the vicinity of the seal lip 21 in the radial direction. In addition, the inner peripheral edge portion 43 is formed annularly around the axis x in order to insert the rotating shaft. Specifically, the inner peripheral edge portion 43 is formed to correspond to the shape of the seal lip 21 and the lip front end portion 22 . The front portion 42 does not interfere with the sealing lip 21 or the snap ring 30 .

In addition, the front surface portion 42 has a stepped portion 44 . The stepped portion 44 is a portion provided on the inner peripheral edge portion 43 of the front surface portion 42 , and is a portion extending radially from the inner peripheral edge portion 43 of the front surface portion 42 . That is, the radial dimension (radial dimension centered on the axis x) of the front surface portion 42 of the stepped portion 44 is different from the radial dimension of other parts of the front surface portion 42 . In addition, the stepped portion 44 is arranged in the front surface portion 42 to correspond to the position where the slit 28 is provided. In addition, the stepped portion 44 may be a portion formed in a portion of the front surface portion 42 that is recessed further toward the outer peripheral side than the inner peripheral edge portion 43 .

In the sealing device 1 , as shown in FIG. 2 , the outer peripheral portion 41 of the slit cover 40 is fitted over the gasket portion 27 of the elastic body portion 20 . Further, the outer peripheral portion 41 is attached to the pad portion 27 so that the front face portion 42 is located further inward than the inner end 27 b of the pad portion 27 and is spaced apart from the inner end 27 b of the pad portion 27 in the axis x direction. . Thereby, the front surface part 42 and the inner side end 27b of the pad part 27 are mutually opposed in the axial-axis x direction with a space|interval, and cover the slit 28 from the inside in the axial-axis x direction. In this way, in the sealing device 1 , the slit 28 is covered from the inside in the axis x direction while maintaining the penetration between the inner side and the outer side of the slit 28 . In addition, although the width in the axis x direction of the outer peripheral portion 41 of the slit cover 40 is larger than the width in the axis x direction of the pad portion 27 , the width in the axis x direction of the outer peripheral portion 41 is not limited to this. When the outer peripheral portion 41 is attached to the pad portion 27 so that the front face portion 42 is positioned more inward than the inner end 27b of the pad portion 27 and is spaced apart from the inner end 27b of the pad portion 27 in the axis x direction, Then, the width of the outer peripheral portion 41 in the axis x direction may be any size.

In addition, the slit cover 40 is attached to the sealing device 1 so that the stepped portion 44 of the front surface portion 42 of the slit cover 40 is located at a position corresponding to the position of the slit 28 . For example, the slit cover 40 is attached to the sealing device 1 so that the stepped portion 44 is located on the inner peripheral side of the portion of the front surface portion 42 that covers the slit 28 . This makes it possible to easily position the slit 28 in the member to be attached to which the sealing device 1 is attached, in a use state to be described later. Therefore, in the mounted member, the slit 28 can be easily positioned at a preferable position.

Next, the action of the sealing device 1 having the above-described structure will be described by showing an example of the use state. The sealing device 1 is used together with other conventional sealing devices to separate and seal two fluids (objects to be sealed). For example, the sealing device 1 is used in an engine to separate hydraulic oil and lubricating oil to seal a gap between a shaft (rotating shaft) and a through hole through which the shaft is inserted.

FIG. 3 is a cross-sectional view of a cross-section taken along the axis x for showing the first use state of the sealing device 1 . In addition, FIG. 4 is a cross-sectional view of a cross-section along the axis x for showing the second use state of the sealing device 1 . As shown in FIGS. 3 and 4 , in the example of the first use state and the example of the second use state, different fluids are sealed on the outer side and the inner side in the axis x direction of the sealing device 1 . As shown in FIGS. 3 and 4 , in the example of the first use state and the example of the second use state, only the other sealing devices 5 and 8 combined with the sealing device 1 are different. The sealing device 5 and the sealing device 8 as other sealing devices are well-known sealing devices, and detailed descriptions thereof are omitted. As other sealing means, any sealing means can be used.

The sealing device 1 and the other sealing devices 5 and 8 are used to separate and seal the two fluids in the space between the moving shaft 3 and the housing 200 having the through hole 220 through which the shaft 3 is inserted. In addition, the movement of the shaft 3 is a rotational movement around the axis, a reciprocating movement along the axis, or the like. In the example of the first use state, the sealing device 5 as another sealing device is arranged on the fluid side outside the sealing device 1 . Specifically, in the example of the first use state, the rear cover portion 26 of the sealing device 1 and the rear cover portion 56 of the sealing device 5 are disposed opposite to each other with a gap 6 in the through hole 220 . In the example of the second use state, the sealing device 8 as another sealing device is arranged outside the sealing device 1 . Specifically, in the example of the second use state, the rear cover portion 26 of the sealing device 1 and the rear cover portion 86 of the sealing device 8 are disposed opposite to each other with the gap 6 in the through hole 220 .

As shown in FIGS. 3 and 4 , the sealing device 1 is press-fitted into the through hole 220 to be mounted. In the sealing device 1 , the gasket portion 27 of the elastic body portion 20 is compressed between the inner peripheral surface 41 a of the outer peripheral portion 41 of the slit cover 40 and the reinforcing ring 10 , and is liquid-tight with the inner peripheral surface 41 a of the outer peripheral portion 41 . ground contact. In addition, in the sealing device 1 in the use state, the outer peripheral portion 41 of the slit cover 40 is in liquid-tight contact with the inner peripheral surface 220 a of the through hole 220 of the housing 200 . In addition, the lip front end portion 22 of the seal lip 21 is in fluid-tight contact with the shaft 3 so that the shaft 3 can slide. The sealing device 1 is provided with the slit 28 in the gasket part 27 . Thereby, sealing of the annular gap between the shaft 3 and the inner peripheral surface 220 a of the through hole 220 is achieved by the sealing device 1 .

However, the slit 28 forms a through-passage on the contact surface of the gasket part 27 of the sealing device 1 and the outer peripheral part 41 of the slit cover 40 , and the through-passage penetrates the inner and outer sides of the sealing device 1 in the axis x direction.

With the above configuration, the sealing device 1 seals the space between the through hole 220 of the housing 200 and the shaft 3 except for the through passage formed by the slit 28 . That is, the slit 28 communicates between the gap 6 between the sealing device 1 and the sealing device 5 or the sealing device 8 in the through hole 220 and the space where the sealing object sealed by the sealing device 1 exists (the sealing object space 9 ), A path through which air can flow is formed between the gap 6 and the sealing object space 9 . Therefore, in the use state of the seal device 1, even if the suction action of the seal lip 21 by the rotation of the shaft 3 and the suction action of the other seal devices 5 and 8 are used, the air in the gap 6 flows through the contact portion of each seal lip to each seal lip. The inside of the sealing object space of the sealing device is sucked out, and the air in the sealing object space 9 can also move from the sealing object space 9 to the gap 6 through the air passage formed by the slit 28 . Therefore, it is not necessary to provide a discharge passage communicating with the gap 6 in the casing 200 as conventionally, and it is possible to prevent negative pressure from being generated in the gap 6 due to the suction action of the sealing devices 1 , 5 , and 8 . Thereby, the lip front end portion 22 of the seal lip 21 can be prevented from being excessively worn due to strong contact with the shaft 3 .

In addition, in the sealing device 1, the slit cover 40 covers the slit 28 from the inside in the axis x direction. That is, the slit cover 40 covers the inner end 28a of the slit 28 communicating with the sealing object space 9 from the sealing object space 9 side, and can prevent the sealing object from entering the slit 28 from the inner end 28a. Therefore, the generation of the negative pressure described above can be prevented by the slit 28 , and the leakage of the object to be sealed from the slit 28 can be prevented.

The sealing device 1 is provided with a step portion 44 extending longer in the radial direction than the other portions of the front surface portion 42 corresponding to the position where the slit 28 is provided in the circumferential direction. Therefore, according to the sealing device 1 , in the use state, the slit cover 40 can be easily attached to an appropriate position of the slit cover 40 for preventing leakage of the object to be sealed through the slit 28 .

Next, the position of the slit 28 relative to the shaft 3 in the use state of the sealing device 1 will be described.

FIG. 5 is a schematic diagram showing the position of the slit 28 with respect to the shaft 3 in the use state of the sealing device 1 . As shown in FIG. 5 , when the shaft 3 rotates in the R direction with the axis x as the center, the oil level OL of the lubricating oil O, which is the object to be sealed, is at the lower end of the shaft 3 in the gravitational direction as the center so that the lower half The location where at least a portion of the portion is impregnated. In this case, in order to prevent the lubricating oil O wound up by the shaft 3 from entering the slit 28 , the slit 28 is preferably arranged in the upper half of the shaft 3 in the direction of gravity when the sealing device 1 is in use. In addition, it is preferable that the stepped portion 44 of the slit cover 40 is also arranged in the upper half of the shaft 3 in the direction of gravity in the use state in accordance with the position of the slit 28 .

In addition, as shown in FIG. 5 , in the use state, the slit 28 is more preferably arranged at the upper half of the shaft 3 in the gravitational direction and at the downstream side in the rotational direction R of the shaft 3 . This is because the position of the slit 28 can be separated from the oil level OL in the rotational direction R of the shaft 3 , so that the droplets of the sealing object rolled up by the rotation of the shaft 3 are less likely to enter the slit 28 .

In this way, according to the sealing device 1 according to the embodiment of the present invention, the structure of the casing 200 is not complicated, and it can be used in a usage form in which two fluids are separated and sealed.

Next, an example of the assembling operation of the sealing device 1 described above will be described.

FIG. 6 is a schematic diagram showing an example of an assembling operation of the elastic body portion 20 and the slit cover 40 in the sealing device 1 . In FIG. 6 , in order to illustrate the assembling operation of the elastic body portion 20 and the slit cover 40 in the sealing device 1 , the cross section of the sealing device 1 is schematically shown. As shown in FIG. 6 , when assembling the sealing device 1, for example, a jig 90 including a first jig 91 and a second jig 92 can be used. The first jig 91 holds the elastic body portion 20 integrally formed with the reinforcing ring 10, Two clamps 92 hold the slit cover 40 .

The first jig 91 has a shape to be engaged with the pad portion 27 and the slit 28 provided on the outer peripheral surface of the elastic body portion 20 , thereby being able to hold the elastic body portion 20 . The first jig 91 has a first engaging portion 93 that is a convex portion that engages with the slit 28 corresponding to the concave shape of the slit 28 in the radial direction.

The second jig 92 has a shape to be engaged with the outer peripheral portion 41 of the slit cover 40 and the front surface portion 42 extending in the direction orthogonal to the axis x direction, whereby the slit cover 40 can be held. The second jig 92 has a second engaging portion 94 that engages with the stepped portion 44 in accordance with the shape of the stepped portion 44 in the radial direction.

The first jig 91 is provided with a first fitting portion 95 at a site where the second jig 92 is fitted. In addition, the second jig 92 is provided with a second fitting portion 96 at a site where the first jig 91 is fitted. By having the first fitting portion 95 and the second fitting portion 96, the first jig 91 and the second jig 92 can be fitted to each other.

When assembling the sealing device 1, for example, the following steps are performed. First, the first jig 91 holding the elastic body portion 20 and the second jig 92 holding the slit cover 40 are fitted.

After the first jig 91 and the second jig 92 are fitted, the pressing member 97 applies a pressure P from the upper side of the first jig 91 to the rear cover portion 26 of the elastic body portion 20 and presses it. Thereby, the elastic body part 20 moves to the lower side of the slit cover 40 and presses the pad part 27 into the outer peripheral part 41 of the slit cover 40 .

By assembling through the above steps, the sealing device 1 can easily perform the radial positioning of the slit 28 of the elastic body portion 20 and the stepped portion 44 of the slit cover 40 .

The embodiment of the present invention has been described above, but the present invention is not limited to the sealing device according to the above-described embodiment of the present invention, and includes all aspects included in the concept of the present invention and the claims. Moreover, in order to achieve at least a part of the above-mentioned subject and effect, you may combine each structure suitably and selectively. For example, the shape, material, arrangement, size, etc. of each structure in the above-described embodiments can be appropriately changed according to the specific usage of the present invention.

In addition, in the above description, the sealing device 1 includes the gasket portion 27 positioned on the outer peripheral side of the elastic body portion 20 and the rear cover portion 26 which is a surface orthogonal to the axis x direction, and has an annular narrow slit around the axis. The case of the slit cover 40 has been described. Here, the sealing device according to the present invention is not limited to the sealing device in which the slit cover is annular. That is, in the present invention, the sealing device can prevent the sealing object from entering the slit from the inner end portion as long as the slit provided in the gasket portion with the axis x direction as the longitudinal direction is covered with, for example, a plate-shaped member. In addition, as long as the sealing device according to the present invention is a sealing device having a slit provided in the direction of the axis x as a longitudinal direction in the gasket part, it is possible to form a sealing device between a pair of sealing devices which are provided facing away from each other in a use state. The inside and outside of the gap circulate. That is, the sealing device according to the present invention may not include the slit cover that covers the outer peripheral side of the slit.

【Symbol Description】

1...seal device; 2...housing; 3...shaft; 5...seal device; 6...clearance; 8...seal device; 20...elastic body part; 21...seal lip; 22...lip front end; 22a...cone surface; 22b...thread protrusion; 23...receiving groove; 25...lip waist; 26...rear cover part; 27a...outer peripheral surface; 27b...inside end; 28...slit; 28a...inside end portion; 29...inner lining portion; 42...Front portion; 43...Inner peripheral portion; 44...Step portion; 56...Rear cover portion; 86...Rear cover portion; 90...Clamp; 91...First clamp; 92...Second clamp; 93...First engagement 94...Second engaging portion; 95...First fitting portion; 96...Second fitting portion; 97...Press part; 110...Sealing device; 121...Seal lip; 160...clearance; 200...case; 210...discharge passage; 220...through hole; 220a...inner peripheral surface.

Claims (5)

1. A sealing device, characterized in that, comprising: A ring-shaped reinforcing ring around the axis; an elastomeric portion annularly shaped about the axis, mounted to the reinforcing ring, and having a sealing lip formed of elastomer; and an annular slit cover around the axis is fitted over the outer peripheral side of the elastic body part, The elastic body portion has a slit extending along the axial direction on the outer peripheral side and recessed toward the inner peripheral side, The slit cover covers the slits at intervals in the axial direction. 2. The sealing device of claim 1, wherein The elastic body portion has a pad portion that is a portion that covers the reinforcing ring from the outer peripheral side, The slit is provided on the pad portion. 3. The sealing device of claim 1 or 2, wherein The slit cover has an annular outer peripheral portion extending in the axial direction, and a front surface portion extending toward the inner peripheral side from one end portion in the axial direction of the outer peripheral portion, The slit cover is fitted over the elastic body portion at the outer peripheral portion, and the front surface portion covers the slit at intervals in the axial direction. 4. The sealing device of claim 3, wherein The front portion has a step portion, and the step portion is different in size in the radial direction from other portions. 5. The sealing device of claim 1, wherein The slit is provided in a range of a half portion or less in the circumferential direction in the elastic body portion.

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