CN110878837A - Sealing device - Google Patents
Sealing device Download PDFInfo
- Publication number
- CN110878837A CN110878837A CN201910836991.XA CN201910836991A CN110878837A CN 110878837 A CN110878837 A CN 110878837A CN 201910836991 A CN201910836991 A CN 201910836991A CN 110878837 A CN110878837 A CN 110878837A
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- CN
- China
- Prior art keywords
- slit
- sealing device
- axis
- outer peripheral
- elastic body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007789 sealing Methods 0.000 title claims abstract description 132
- 230000002093 peripheral effect Effects 0.000 claims abstract description 80
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 229920001971 elastomer Polymers 0.000 claims description 12
- 239000000806 elastomer Substances 0.000 claims description 10
- 230000000994 depressogenic effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 13
- 230000003014 reinforcing effect Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 6
- 238000012856 packing Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a sealing device which can be used in a use mode of separating and sealing two fluids without complicating the structure of a shell. The method comprises the following steps: a reinforcement ring (10) annular about an axis (x); an elastic body part (20) which is annular around the axis (x), is mounted on the reinforcing ring (10), and is provided with a sealing lip (21) formed by the elastic body; and a slit cover (40) that is annular around the axis (x) and that is fitted to the outer peripheral side of the elastic body (20), the elastic body (20) having, on the outer peripheral side, a slit (28) that extends in the direction of the axis (x) and that is recessed toward the inner peripheral side, the slit cover (40) covering the slit (28) at intervals in the direction of the axis (x).
Description
Technical Field
The present invention relates to a sealing device.
Background
Conventionally, as a usage form of a sealing device, there is a case of a portion for separating and sealing two kinds of fluids, such as a case of separating and sealing a working oil and an engine oil in an engine, for example. In this case, an example is known in which two sealing devices are used in combination as a pair for each fluid type.
Fig. 7 is a sectional view taken along an axis x, and shows a state of use of the conventional sealing device 110 for separating and sealing two fluids. As shown in fig. 7, as a conventional use method for separating and sealing two types of fluids, a pair of sealing devices 110 may be disposed to face away from each other.
Specifically, the pair of sealing devices 110 are attached to the housing 2 so that the rear cover portions 126 face each other with the gap 160 therebetween, and the gap between the shaft 3 and the through hole 220 of the housing 2 is sealed. The conventional seal device 110 arranged as described above exerts a suction effect by rotation of the shaft 3 in a use state, and particularly, 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 negative pressure, the lip distal end portion 122 of the seal lip 121 strongly contacts the shaft 3, and the lip distal end portion 122 may be excessively worn. Therefore, conventionally, when two sealing devices 110 are used in combination as a pair, a discharge passage 210 is formed in the housing 2, and the negative pressure in the gap 160 is removed through the discharge passage 210, the discharge passage 210 being a through hole that opens the gap 160 to the outside (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese examined patent publication (Kokoku) No. 6-40373.
Disclosure of Invention
Problems to be solved by the invention
As described above, in the conventional case where the conventional sealing device 110 is used as a pair, the gap 160 is provided, and the discharge passage 210 needs to be provided in the housing 2 in order to prevent the negative pressure from being generated in the gap 160, which complicates the structure. In this way, the two types of fluids are separated and sealed by the conventional sealing device, and therefore the structure of the housing 2 becomes complicated.
The present invention has been made in view of the above problems, and an object thereof is to provide a sealing device which can be used in a use mode in which two kinds of fluids are separated and sealed without complicating the structure of a housing.
Means for solving the problems
In order to achieve the above object, a sealing device according to the present invention includes: a reinforcement ring annular about an axis; an elastomer portion annular about the axis, mounted to the reinforcement ring, and having a sealing lip formed of an elastomer; and a slit cover that is annular around the axis and is fitted to an outer peripheral side of the elastic body portion, the elastic body portion having, on the outer peripheral side, slits that extend in the axis direction and are recessed toward an inner peripheral side, the slit cover covering the slits at intervals in the axis direction.
In the sealing device according to one aspect of the present invention, the elastic body portion includes a cushion portion covering the reinforcing ring from an outer peripheral side, and the slit is provided in the cushion portion.
In the sealing device according to one aspect of the present invention, the slit cover includes: an annular outer peripheral portion extending in the axial direction; and a front surface portion extending from one end portion of the outer peripheral portion in the axial direction toward an inner peripheral side, wherein the slit cover is fitted to the elastic body portion at the outer peripheral portion, and the front surface 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 stepped portion having a size in a radial direction different from that of other portions.
In the sealing device according to one aspect of the present invention, the slit is provided in a range not more than a half portion in a circumferential direction of the elastic body portion.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the sealing device of the present invention, the structure of the housing is not complicated, and the sealing device can be used in a use mode in which two fluids are separated and sealed.
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 sectional view of a cross section along an axis line for showing a schematic structure of the sealing device shown in fig. 1.
Fig. 3 is a sectional view of a section along an axis for showing a first usage state of the sealing device shown in fig. 1.
Fig. 4 is a sectional view of a section along an axis for showing a second use state of the sealing device shown in fig. 1.
Fig. 5 is a schematic view for showing a position of a slit with respect to a shaft in a use state of the sealing device shown in fig. 1.
Fig. 6 is a schematic view for illustrating an example of an assembly operation of the elastic body portion and the slit cover in the sealing device shown in fig. 1.
Fig. 7 is a cross-sectional view taken along an axis line to show a schematic configuration of a conventional sealing device.
Detailed Description
Hereinafter, a sealing device according to an embodiment of the present invention will be described with reference to the drawings.
Hereinafter, for convenience of explanation, the direction of arrow a (see fig. 1 and 2) in the axis x direction is taken as the outside, and the direction of arrow b (see fig. 1 and 2) in the axis x direction is taken as the inside. In a direction perpendicular to the axis x (hereinafter also referred to as "radial direction"), a direction away from the axis x (arrow c direction in fig. 1) is an outer peripheral side, and a direction approaching the axis x (arrow d direction in fig. 1) is an 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. Fig. 2 is a partial sectional view of a cross section along the axis x to show a schematic configuration of the sealing device 1 shown in fig. 1. The structure of the sealing device 1 according to the present embodiment will be described with reference to fig. 1 and 2.
As shown in fig. 1 and 2, a sealing device 1 according to the present embodiment includes: a reinforcement ring 10, annular about the axis x; an elastomer portion 20 mounted on the reinforcing ring 10, having a seal lip formed of an elastomer, and having a ring shape around the axis x; and a slit cover 40 fitted around the outer peripheral side of the elastic body portion 20 and having a ring shape around the axis x. Further, the elastic body portion 20 has a slit 28 extending in the axis x direction on the outer peripheral side and depressed toward the inner peripheral side, and a slit cover 40 covers the slit 28 with a space in the axis x direction. The structure of the sealing device 1 will be specifically described below.
The reinforcement ring 10 is an annular metal member centered or substantially centered on the axis x, and has an L-shaped or substantially L-shaped cross section (hereinafter also simply referred to as "cross section") along the axis x. The reinforcement ring 10 has, for example: a cylindrical portion 11 which is a cylindrical or substantially cylindrical portion extending in the axis x direction; and a disc portion 12 which is a hollow disc-shaped portion extending from an outer end of the cylindrical portion 11 to an inner circumferential side.
The elastic body portion 20 is attached to the reinforcement ring 10, and in the present embodiment, is formed integrally with the reinforcement ring 10 so as to cover the entire or substantially the entire reinforcement ring 10. The elastomer portion 20 has a seal lip 21, a lip waist portion 25, and a slit 28. As described later, the seal lip 21 is formed so that its shaft slidably abuts 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 an end portion on the inner circumferential 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 formed so as to face the cylindrical portion 11 of the reinforcing ring 10. Specifically, the inner end of the seal lip 21 has a wedge-shaped annular lip tip 22 having a cross-sectional shape that is convex toward the inner circumferential side. A circlip 30 is fitted around the outer peripheral side of the seal lip 21 at a position facing away from the lip tip 22. The circlip 30 is housed in a housing groove 23 and attached to the seal lip 21, and the housing groove 23 is an annular concave portion recessed inward and formed at a position on the outer peripheral side of the seal lip 21 that faces away from the lip tip portion 22. The circlip 30 presses the lip distal end portion 22 in the direction of the axis x, and applies a predetermined amount of tightening force to the lip distal end portion 22 with respect to the shaft so that the lip distal end portion 22 follows the displacement of the shaft. The lip tip portion 22 abuts against the outer peripheral surface of the shaft as described later, and seals between the sealing device 1 and the shaft.
As shown in fig. 2, a plurality of screw projections 22b are formed at equal angular intervals in the circumferential direction on a conical surface 22a outside the lip tip 22, and the screw projections 22b extend obliquely with respect to the tip of the lip tip 22 and project toward the inner peripheral side. The screw thread protrusion 22b generates an air flow from the outside to the inside when the shaft slides, and prevents the object to be sealed from leaking from the inside. The threaded protrusion 22b may not be provided on the elastic body portion 20. That is, the screw thread protrusion 22b functions as a pump.
The elastic body portion 20 includes a rear cover portion 26, a pad portion 27, and a lining portion 29. The rear cover portion 26 covers the disk portion 12 of the reinforcement ring 10 from the outside, and the inner liner portion 29 covers the reinforcement ring 10 from the inside and the inner periphery. The pad portion 27 is a portion of the elastic body portion 20 covering the cylindrical portion 11 of the reinforcing ring 10 from the outer peripheral side. The cushion portion 27 is a portion where the elastic body portion 20 is fitted to the slit cover 40, and contacts an inner peripheral surface (inner peripheral surface 41a) of the outer peripheral portion 41 of the slit cover 40, as described later. In the sealing device 1, the gasket 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 directed in the radial direction, that is, a fitting force, with a predetermined magnitude. The radial thickness of the spacer portion 27 is set to generate a predetermined fitting force when the slit cover 40 is press-fitted.
The slit 28 is provided on the outer peripheral surface (outer peripheral surface 27a) of the pad portion 27 of the elastic body portion 20, and is a portion recessed inward from the outer peripheral surface 27a of the pad portion 27. The slit 28 extends in the axis x direction, for example, extends in the axis x direction over the entire width of the pad portion 27 (the width 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 a dotted line in fig. 1, the slit 28 is formed in a shape of, for example, a semicircular or substantially semicircular groove toward the inner peripheral side when viewed from the front. The slit 28 has a predetermined depth in the radial direction of the elastic body portion 20.
The shape of the slit 28 when viewed from the front is not limited to the above example as long as the slit 28 is a concave groove recessed inward from the outer peripheral surface 27a of the pad portion 27. As shown in the present embodiment, the number of slits 28 may be at least one provided in the sealing device 1, and a plurality of slits 28 may be provided in the sealing device 1. Further, in the cushion portion 27 of the elastic body portion 20, the slit 28 is provided in a range of not more than a half portion in the circumferential direction. For example, in a state of use of the sealing device 1 described later, the slit 28 is provided in a range on the upper half side in the gravity direction of the packing portion 27. For example, in order to prevent the sealing object that is rolled up by the rotation of the shaft 3 from entering the slit 28, the slit 28 is provided on the downstream side in the rotation direction of the shaft 3 in a range on the upper half side in the gravity direction of the packing portion 27.
The elastic body portion 20 is integrally formed of an elastic material, and the seal lip 21, the lip waist portion 25, the rear cover portion 26, the pad portion 27, and the inner liner portion 29 are portions of the elastic body portion 20 integrally formed of an elastic material.
Examples of the metal material of the reinforcement ring 10 include stainless steel and SPCC (cold rolled steel). Further, as the elastic body of the elastic body portion 20, various rubber materials are available, for example. Examples of the various rubber materials include synthetic rubbers such as Nitrile Butadiene Rubber (NBR), hydrogenated nitrile butadiene rubber (H-NBR), acrylic rubber (ACM), and Fluororubber (FKM). The reinforcement ring 10 is manufactured by, for example, press working or forging, and the elastomer portion 20 is formed by cross-linking (vulcanization) molding using a molding die. In this cross-linking molding, the reinforcing ring 10 is placed in a molding die, the elastomer part 20 is bonded to the reinforcing ring 10 by cross-linking bonding, and the elastomer part 20 and the reinforcing ring 10 are integrally molded.
As described above, the sealing device 1 further has the slit cover 40 annularly shaped around the axis x fitted to the cushion portion 27 of the elastic body 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 formed to cover the slit 28 with a space in the axis x direction. The slit cover 40 is, for example, an annular member centered or substantially centered on the axis x, 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 to be in close contact with the outer peripheral surface 27a of the pad portion 27 of the elastic body portion 20. Further, the outer peripheral portion 41 has a width in the x-axis direction that is larger than the width in the x-axis 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 be mounted of the sealing device 1 such as a housing through which a rotating shaft is inserted in a use state. Therefore, when the sealing device 1 is press-fitted into the through hole of the member to be attached, the outer peripheral portion 41 is formed to be in close contact with the inner peripheral surface of the through hole, and seals between the sealing device 1 and the through hole.
The front surface portion 42 is a hollow disk-shaped portion extending from an inner end of the outer peripheral portion 41 toward the inner peripheral side, and is formed to face an inner end (inner end 27b) of the pad portion 27 of the elastic body portion 20 in the axis x direction at a distance from each other so as to cover the slit 28 from the inner side in the axis x direction. The front face portion 42 extends, for example, in a direction orthogonal to the axis x direction. The front surface portion 42 extends from an inner end of the outer peripheral portion 41 toward the inner peripheral side to a position covering the slit 28 from the inner side at least in the axis x direction, and an inner peripheral edge portion 43, which is an inner peripheral edge portion of the front surface portion 42, is positioned on the inner peripheral side in the radial direction with respect to the slit 28. For example, as shown in fig. 2, the inner peripheral edge portion 43 of the front face portion 42 extends in the radial direction to the vicinity of the seal lip 21. Further, the inner peripheral edge portion 43 is formed annularly around the axis x for inserting the rotary shaft, and specifically, the inner peripheral edge portion 43 is formed in a shape corresponding to the seal lip 21 and the lip tip portion 22. The front face portion 42 does not interfere with the seal lip 21 or the circlip 30.
In addition, the front surface portion 42 has a stepped portion 44. The step portion 44 is a portion provided on the inner peripheral edge portion 43 of the front face portion 42, and is a portion extending in the radial direction from the inner peripheral edge portion 43 of the front face portion 42. That is, the radial dimension of the front face portion 42 of the stepped portion 44 (radial dimension centered on the axis x) is different from the radial dimension of the other portion of the front face portion 42. The stepped portion 44 is disposed in the front surface portion 42 corresponding to the position where the slit 28 is provided. The stepped portion 44 may be a portion formed in the front surface portion 42 so as to be recessed more 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 cushion portion 27 of the elastic body portion 20. The outer peripheral portion 41 is attached to the pad portion 27 such that the front surface portion 42 is located 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 x-axis direction. Thus, the front portion 42 faces the inner end 27b of the pad portion 27 with a gap therebetween in the axis x direction, and covers the slit 28 from the inside in the 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 inside and the outside of the slit 28. Further, although the width of the outer peripheral portion 41 of the slit cover 40 in the x-axis direction is larger than the width of the pad portion 27 in the x-axis direction, the width of the outer peripheral portion 41 in the x-axis direction is not limited thereto. If the outer peripheral portion 41 is attached to the cushion portion 27 such that the front surface portion 42 is located more inward than the inner end 27b of the cushion portion 27 and is spaced apart from the inner end 27b of the cushion portion 27 in the x-direction of the axis, the width of the outer peripheral portion 41 in the x-direction of the axis may be any size.
Further, the slit cover 40 is attached to the sealing device 1 such that the stepped portion 44 of the front surface portion 42 of the slit cover 40 is positioned at a position corresponding to the position of the slit 28. For example, the slit cover 40 is attached to the sealing device 1 such that the stepped portion 44 is positioned on the inner peripheral side of the portion of the front surface portion 42 covering the slit 28. This makes it possible to easily position the slit 28 in the member to be attached as the object to which the sealing device 1 is to be attached in a use state described later. Therefore, in the mounted member, the slit 28 can be easily positioned at a preferable position.
Next, an example in which the operation of the sealing device 1 having the above-described structure is in a use state will be described. The sealing device 1 is used together with other conventional sealing devices to separate two kinds of fluids (objects to be sealed) and seal them. For example, the sealing device 1 is used to separate working oil and lubricating oil in an engine and seal a gap between a shaft (rotating shaft) and a through hole through which the shaft is inserted.
Fig. 3 is a sectional view of the sealing device 1 taken along the axis x in a first state of use. Fig. 4 is a cross-sectional view of the sealing device 1 taken along the axis x to show a second use state. As shown in fig. 3 and 4, in the first and second use states, different fluids are sealed on the outside and inside in the axis x direction of the sealing device 1. As shown in fig. 3 and 4, the first and second use states are different from each other only in the sealing devices 5 and 8 combined with the sealing device 1. The sealing device 5 and the sealing device 8, which are other sealing devices, are well known sealing devices, and detailed description thereof is omitted. As other sealing means, any sealing means may be used.
The seal device 1 and the other seal devices 5 and 8 are used to separate and seal two fluids in a space between a moving shaft 3 and a housing 200 having a through hole 220 through which the shaft 3 is inserted. 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 usage state, the sealing device 5 as another sealing device is disposed on the fluid side outside the sealing device 1. Specifically, in the example of the first usage state, the rear cover portion 26 of the sealing device 1 and the rear cover portion 56 of the sealing device 5 are disposed in the through hole 220 so as to be opposed to each other with the gap 6 therebetween. In the example of the second usage state, the sealing device 8 as another sealing device is disposed outside the sealing device 1. Specifically, in the example of the second usage state, the rear cover portion 26 of the seal device 1 and the rear cover portion 86 of the seal device 8 are disposed in the through hole 220 so as to be opposed to each other with the gap 6 therebetween.
As shown in fig. 3 and 4, the sealing device 1 is press-fitted into the through hole 220. In the sealing device 1, the pad portion 27 of the elastic body portion 20 is compressed between the inner peripheral surface 41a of the outer peripheral portion 41 of the slit cover 40 and the reinforcing ring 10, and is in liquid-tight contact with the inner peripheral surface 41a of the outer peripheral portion 41. 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 220a of the through hole 220 of the housing 200. Further, the lip tip portion 22 of the seal lip 21 is liquid-tightly contacted with the shaft 3 so that the shaft 3 can slide. The sealing device 1 is provided with a slit 28 in the packing portion 27. Thereby, the sealing device 1 seals the annular gap between the shaft 3 and the inner circumferential surface 220a of the through hole 220.
However, the slit 28 forms a through passage in the contact surface between the packing portion 27 of the sealing device 1 and the outer peripheral portion 41 of the slit cover 40, and the through passage penetrates the inside and the outside of the sealing device 1 in the direction of the axis x.
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 (the sealing object space 9) where the sealing object sealed by the sealing device 1 is present, and forms a path through which air can flow between the gap 6 and the sealing object space 9. Therefore, even if the suction action of the seal lip 21 and the suction action of the other seal devices 5 and 8 are caused by the rotation of the shaft 3 in the use state of the seal device 1, the air in the gap 6 is sucked into the space to be sealed of each seal device through the contact portion of each seal lip, and the air in the space to be sealed 9 can move from the space to be sealed 9 to the gap 6 through the passage of air formed by the slit 28. Therefore, it is not necessary to provide a discharge passage communicating with the gap 6 in the case 200 as in the conventional case, and it is possible to prevent the negative pressure from being generated in the gap 6 by the suction action of the sealing devices 1, 5, and 8. This prevents the lip distal end 22 of the seal lip 21 from being excessively worn due to strong contact with the shaft 3.
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 object space 9 from the object space 9 side, and thus can prevent the object from entering the slit 28 from the inner end 28 a. Therefore, the slit 28 can prevent the negative pressure from being generated, and the sealing object can be prevented from leaking from the slit 28.
The sealing device 1 is provided with a step portion 44 extending longer in the radial direction than the other portion 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 the sealing object from leaking through the slit 28.
Next, the position of the slit 28 with respect to the shaft 3 in the use state of the sealing device 1 will be described.
Fig. 5 is a schematic view for 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 about the axis x, the oil level OL of the lubricant oil O as the object to be sealed is located at a position where at least a part of the lower half portion is immersed about the lower end portion of the shaft 3 in the gravity direction. In this case, in order to prevent the lubricant oil O that is wound up by the shaft 3 from entering the slit 28, it is preferable that the slit 28 is disposed in the upper half of the shaft 3 in the direction of gravity in the use state of the sealing device 1. Further, the step portion 44 of the slit cover 40 is preferably disposed in the upper half of the shaft 3 in the gravitational direction in the use state, corresponding to the position of the slit 28.
As shown in fig. 5, in the use state, the slit 28 is more preferably disposed at a position on the upper half of the shaft 3 in the gravitational direction and on the downstream side in the rotational direction R of the shaft 3. This is because the slit 28 can be positioned away from the oil level OL in the rotation direction R of the shaft 3, and the droplets of the sealing object that are wound up by the rotation of the shaft 3 are less likely to enter the slit 28.
As described above, the sealing device 1 according to the embodiment of the present invention can be used in a use mode in which two fluids are separated and sealed without complicating the structure of the housing 200.
Next, an example of the assembling operation of the sealing device 1 described above will be described.
Fig. 6 is a schematic diagram for illustrating an example of an assembly operation of the elastic body portion 20 and the slit cover 40 in the sealing device 1. Fig. 6 schematically shows a cross section of the sealing device 1 to illustrate an assembly operation of the elastic body portion 20 and the slit cover 40 in the sealing device 1. As shown in fig. 6, when the sealing device 1 is assembled, for example, a jig 90 including a first jig 91 and a second jig 92 may be used, the first jig 91 holding the elastic body portion 20 integrally formed with the reinforcement ring 10, and the second jig 92 holding the slit cover 40.
The first jig 91 has a shape that engages with the pad 27 and the slit 28 provided on the outer peripheral surface of the elastic body portion 20, and thereby can hold the elastic body portion 20. The first jig 91 has a first engaging portion 93, and the first engaging portion 93 is a convex portion that engages with the slit 28 in a radial direction corresponding to the concave shape of the slit 28.
The second jig 92 has a shape that engages 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, and can hold the slit cover 40. The second jig 92 has a second engaging portion 94 that engages with the stepped portion 44 in a radial direction corresponding to the shape of the stepped portion 44.
The first jig 91 includes a first fitting portion 95 at a portion fitted to the second jig 92. The second jig 92 includes a second fitting portion 96 at a portion fitted to the first jig 91. 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 the sealing device 1 is assembled, the following steps are performed, for example. First, the first jig 91 holding the elastic body portion 20 and the second jig 92 holding the slit cover 40 are fitted to each other.
After the first jig 91 and the second jig 92 are fitted, the pressing member 97 presses the rear cover portion 26 of the elastic body portion 20 by applying a pressure P from above the first jig 91. Thereby, the elastic body portion 20 moves toward the lower slit cover 40, and the pad portion 27 is pressed into the outer peripheral portion 41 of the slit cover 40.
By assembling through the above steps, the sealing device 1 can easily perform positioning of the slit 28 of the elastic body portion 20 and the step portion 44 of the slit cover 40 in the radial direction.
The embodiments of the present invention have been described above, but the present invention is not limited to the sealing device according to the above-described embodiments of the present invention, and includes all the embodiments included in the concept of the present invention and the claims. In order to achieve at least part of the above-described problems and effects, the respective structures may be selectively combined as appropriate. For example, the shape, material, arrangement, size, and the like of each structure in the above embodiments may be appropriately changed according to a specific use mode of the present invention.
In the above description, the case where the sealing device 1 includes the slit cover 40 that is annular around the axis and covers the gasket portion 27 located on the outer peripheral side of the elastic body portion 20 and the rear cover portion 26 that is a surface orthogonal to the x-direction of the axis is described. Here, the seal device according to the present invention is not limited to a seal device in which the slit cover is annular. That is, in the present invention, as long as the slit provided in the packing portion with the axis x direction as the longitudinal direction can be covered with, for example, a plate-like member, the sealing device can prevent the object to be sealed from entering the slit from the inner end. In addition, the sealing device according to the present invention is a sealing device provided with a slit provided in a longitudinal direction of the gasket portion in the x-axis direction, and can flow inside and outside a gap formed between a pair of sealing devices provided to face away from each other in a use state. That is, the sealing device according to the present invention may not include a slit cover covering the outer peripheral side of the slit.
[ notation ] to show
1 … sealing device; 2 … shell; 3 … axes; 5 … sealing means; 6 … gap; 8 … sealing means; 9 … sealing the object space; 10 … reinforcing ring; 11 … cylindrical part; 12 … a disc portion; 20 … an elastomeric body; 21 … sealing lip; 22 … lip tip; 22a … taper; 22b … thread protrusions; 23 … accommodating groove; 25 … lip waist; 26 … rear cover portion; 27 … a pad section; 27a … outer circumferential surface; 27b … inboard end; 28 … slits; 28a … inboard end; 29 … inner lining part; 30 … circlip; 40 … slit cover; 41 … outer periphery; 41a … inner peripheral surface; 42 … front face; 43 … inner peripheral edge; 44 … step portion; 56 … rear cover portion; 86 … rear cover portion; a 90 … clamp; 91 … first clamp; 92 … second clamp; 93 … a first engaging part; 94 … second engaging portion; 95 … a first fitting part; 96 … second fitting part; 97 … stamping the parts; 110 … sealing means; 121 … sealing lip; 122 … lip tip; 126 … rear cover portion; 160 … gap; 200 … a housing; 210 … discharge passage; 220 … through holes; 220a ….
Claims (5)
1. A seal assembly, comprising:
a reinforcement ring annular about an axis;
an elastomer portion annular about the axis, mounted to the reinforcement ring, and having a sealing lip formed of an elastomer; and
a slit cover annularly formed around the axis and fitted to an outer peripheral side of the elastic body portion,
the elastic body portion has a slit on an outer peripheral side extending in the axis direction and depressed toward an inner peripheral side,
the slit cover covers the slit with a space in the axis direction.
2. The sealing device of claim 1,
the elastic body portion has a pad portion that is a portion covering the reinforcement ring from an outer peripheral side,
the slit is provided on the pad portion.
3. The sealing device according to claim 1 or 2,
the slit cover has: an annular outer peripheral portion extending in the axial direction; and a front surface portion extending from one end portion of the outer peripheral portion in the axial direction toward an inner peripheral side,
the slit cover is fitted to the elastic body portion at the outer peripheral portion, and the front surface portion covers the slit at intervals in the axis direction.
4. The sealing device of claim 3,
the front surface portion has a stepped portion having a size different from other portions in a radial direction.
5. The sealing device of claim 1,
the slit is provided in a range of not more than a half portion in the circumferential direction in the elastic body portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-167263 | 2018-09-06 | ||
| JP2018167263A JP2020041553A (en) | 2018-09-06 | 2018-09-06 | Sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110878837A true CN110878837A (en) | 2020-03-13 |
Family
ID=69727670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910836991.XA Pending CN110878837A (en) | 2018-09-06 | 2019-09-05 | Sealing device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2020041553A (en) |
| CN (1) | CN110878837A (en) |
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| US4128248A (en) * | 1976-06-04 | 1978-12-05 | Leybold-Heraeus Gmbh & Co. Kg | Shaft seal |
| JPH02138281U (en) * | 1988-07-06 | 1990-11-19 | ||
| DE10011984A1 (en) * | 1999-05-22 | 2001-11-08 | Freudenberg Carl Fa | Automotive sealing ring for shafts comprizes sealing lips and edges on sides relative shaft and ring broached to admit sealing fluid to balance pressures across ring. |
| CN1890495A (en) * | 2003-12-09 | 2007-01-03 | Nok株式会社 | Sealing device |
| CN102011746A (en) * | 2010-11-11 | 2011-04-13 | 华东理工大学 | Automobile water pump bearing sealing device |
| US20150097344A1 (en) * | 2013-10-04 | 2015-04-09 | Nok Corporation | Sealing Device |
| CN105229348A (en) * | 2013-05-14 | 2016-01-06 | Nok株式会社 | Seal arrangement |
| CN105318009A (en) * | 2014-07-30 | 2016-02-10 | 无锡恩福油封有限公司 | Sealing device and manufacture method for the same |
| CN106832696A (en) * | 2017-02-25 | 2017-06-13 | 青岛汉兴新材料有限公司 | A kind of modified polytetrafluoroethylcomposite composite material and preparation method thereof and a kind of sealing system |
| CN107002878A (en) * | 2014-11-18 | 2017-08-01 | Nok株式会社 | Sealing structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0484972U (en) * | 1990-11-30 | 1992-07-23 |
-
2018
- 2018-09-06 JP JP2018167263A patent/JP2020041553A/en active Pending
-
2019
- 2019-09-05 CN CN201910836991.XA patent/CN110878837A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4128248A (en) * | 1976-06-04 | 1978-12-05 | Leybold-Heraeus Gmbh & Co. Kg | Shaft seal |
| JPH02138281U (en) * | 1988-07-06 | 1990-11-19 | ||
| DE10011984A1 (en) * | 1999-05-22 | 2001-11-08 | Freudenberg Carl Fa | Automotive sealing ring for shafts comprizes sealing lips and edges on sides relative shaft and ring broached to admit sealing fluid to balance pressures across ring. |
| CN1890495A (en) * | 2003-12-09 | 2007-01-03 | Nok株式会社 | Sealing device |
| CN102011746A (en) * | 2010-11-11 | 2011-04-13 | 华东理工大学 | Automobile water pump bearing sealing device |
| CN105229348A (en) * | 2013-05-14 | 2016-01-06 | Nok株式会社 | Seal arrangement |
| US20150097344A1 (en) * | 2013-10-04 | 2015-04-09 | Nok Corporation | Sealing Device |
| CN105318009A (en) * | 2014-07-30 | 2016-02-10 | 无锡恩福油封有限公司 | Sealing device and manufacture method for the same |
| CN107002878A (en) * | 2014-11-18 | 2017-08-01 | Nok株式会社 | Sealing structure |
| CN106832696A (en) * | 2017-02-25 | 2017-06-13 | 青岛汉兴新材料有限公司 | A kind of modified polytetrafluoroethylcomposite composite material and preparation method thereof and a kind of sealing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020041553A (en) | 2020-03-19 |
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