WO2018181227A1 - 密封装置 - Google Patents
密封装置 Download PDFInfo
- Publication number
- WO2018181227A1 WO2018181227A1 PCT/JP2018/012236 JP2018012236W WO2018181227A1 WO 2018181227 A1 WO2018181227 A1 WO 2018181227A1 JP 2018012236 W JP2018012236 W JP 2018012236W WO 2018181227 A1 WO2018181227 A1 WO 2018181227A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing device
- slinger
- lip
- protrusion
- radial
- Prior art date
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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
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
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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
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
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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
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
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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
- F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
- F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3456—Pressing means without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip
Definitions
- the present invention relates to a sealing device for sealing between a shaft and a hole into which the shaft is inserted.
- a sealing device is conventionally used to seal between a shaft and a hole into which the shaft is inserted in order to prevent leakage of an object to be sealed such as lubricating oil.
- the sealing lip is brought into contact with the shaft or an annular member attached to the shaft to achieve a seal between the shaft and the sealing device.
- the contact of the seal lip with the shaft for sealing is also a sliding resistance (torque resistance) with respect to the shaft.
- sealing devices have been required to reduce sliding resistance with respect to the shaft, and it is possible to reduce sliding resistance with respect to the shaft while maintaining or improving sealing performance.
- a structure is required.
- the present invention has been made in view of the above-described problems, and its purpose is to suppress the seepage of the sealed object regardless of the value of the rotational speed of the shaft even when the pump action is used.
- An object of the present invention is to provide a sealing device that can perform the above.
- a sealing device is a sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted, and is fitted into the hole.
- the slinger has a flange portion that is an annular portion around the axis extending toward the outer peripheral side, and the elastic body portion is one in the axial direction.
- the flange portion has an end surface lip that is an annular lip around the axis that contacts the flange portion from the other side in the axial direction, and is provided on the other side of the flange portion of the slinger.
- Is at least A plurality of radial projections are formed side by side in the circumferential direction on the inner circumferential surface of the end face lip, and at least one circumferential projection is formed,
- the radial protrusion extends spirally in the rotational direction of the shaft from the other side toward the one side, and a slinger contact portion that is a portion of the end surface lip where the end surface lip contacts the slinger
- the circumferential protrusion is formed around the axis on the other side of the end of the one side of the radial protrusion, and the slinger contact It protrudes from the end face lip on the other side in the axial direction from the portion.
- the circumferential projection forms a gap between a side surface of the at least one radial projection facing the side opposite to the rotational direction of the shaft.
- the circumferential protrusion is provided on the other side of the pump region in the sealing device.
- the radial protrusion is formed at the end face lip with a space from the slinger contact portion.
- the radial protrusion is formed at a distance from the slinger contact portion so as to reach the pump region from the reflux region in the sealing device.
- the groove formed in the slinger is a screw groove.
- the sealing device of the present invention even when the pump action is used, it is possible to suppress the seepage of the sealed object regardless of the value of the rotational speed of the shaft.
- FIG. 2 is a partially enlarged perspective view of an elastic body portion in the sealing device shown in FIG. 1, and shows an elastic body portion in a portion on the inner peripheral side from a base portion cut along a plane along an axis. It is the figure which looked at the slinger in the sealing device shown in FIG. 1 from the outer side.
- FIG. 1 It is a figure for showing the mode of the flow of the sealed object by the action of the radial direction projection of the end face lip, and the circumferential direction projection in the sealing device concerning a 2nd embodiment of the present invention.
- FIG. 10 is a partially enlarged cross-sectional view of the sealing device shown in FIG. 9 in a use state in which the sealing device according to the third embodiment of the present invention is attached to a housing and a shaft inserted into a shaft hole.
- FIG. 1 is a sectional view in a section taken along an axis x for showing a schematic configuration of a sealing device 1 according to a first embodiment of the present invention
- FIG. 2 shows the first embodiment of the present invention.
- It is a partial expanded sectional view which expands and shows some cross sections along the axis line x of the sealing device 1 which concerns.
- a sealing device 1 according to the present embodiment is a sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted, and is formed on a shaft and a housing in a vehicle or a general-purpose machine. This shaft is used to seal between the hole into which the shaft is inserted (shaft hole).
- the sealing device 1 according to the first embodiment of the present invention is applied is not limited to the above.
- the arrow a (see FIG. 1) direction is the inner side in the axis x direction
- the arrow b (see FIG. 1) direction is the other side in the axial direction) in the axis x direction.
- the inner side is the side of the space to be sealed (sealing target side), the side of the space where the sealing target such as lubricating oil exists
- the outer side is the side opposite to the inner side.
- the direction away from the axis x (the direction of arrow c in FIG. 1) is the outer peripheral side
- the direction approaching the axis x is the inner circumference.
- the sealing device 1 includes a sealing device main body 2 fitted in a hole as an attachment target described later, and a slinger 3 attached to a shaft as an attachment target described later.
- the sealing device main body 2 includes an annular reinforcing ring 10 around the axis x and an annular elastic body 20 around the axis x formed from an elastic body attached to the reinforcing ring 10.
- the slinger 3 has a flange portion 31 that is an annular portion around the axis line x extending toward the outer peripheral side (arrow c direction).
- the elastic body portion 20 extends toward one side (inner side, arrow a direction) in the axis x direction, and is around the axis line x contacting the flange portion 31 from the other side (outer side, arrow b direction side) in the axial direction x.
- an end face lip 21 which is an annular lip.
- At least one groove 33 is formed on the other side (outer side) of the flange portion 31 of the slinger 3, and a plurality of radial protrusions are formed on the inner peripheral surface (inner peripheral surface 22) of the end surface lip 21. 23 are formed side by side in the circumferential direction, and at least one circumferential projection 24 is formed.
- the radial protrusion 23 spirally extends from the other side (outer side) to one side (inner side) in the rotational direction of a shaft (slinger 3) described later.
- the lip 21 is formed on the inner peripheral side with respect to the slinger contact portion 22a which is a portion in contact with the slinger 3.
- the circumferential protrusion 24 extends around the axis x on the other side (outer side) of the end (inner end 23a) on one side (inner side) of the radial protrusion 23 (described later). In addition, it protrudes from the end surface lip 21 on the other side in the axis x direction from the slinger contact portion 22a.
- the reinforcing ring 10 in the sealing device main body 2 is an annular metal member having the axis x as the center or substantially the center, and the sealing device main body 2 is press-fitted into the shaft hole of the housing described later. It is formed to be fitted and fitted.
- the reinforcing ring 10 includes, for example, a cylindrical portion 11 that is a cylindrical portion located on the outer peripheral side, a disc portion 12 that is a hollow disc-shaped portion extending from the outer end of the cylindrical portion 11 to the inner peripheral side,
- the conical ring portion 13 which is a conical tube-shaped annular portion extending from the inner peripheral side end of the portion 12 to the inner peripheral side, and from the inner or inner peripheral end of the conical ring portion 13 to the inner peripheral side It has a disk portion 14 that is a hollow disk-shaped portion that extends in the radial direction and reaches the end portion on the inner peripheral side of the reinforcing ring 10.
- the cylindrical portion 11 of the reinforcing ring 10 includes an outer cylindrical portion 11a that is a cylindrical or substantially cylindrical portion located on the outer peripheral side, and an outer peripheral side and an inner peripheral side of the outer peripheral cylindrical portion 11a. It has an inner peripheral cylindrical portion 11b that is a cylindrical or substantially cylindrical portion that extends, and a connection portion 11c that is a portion connecting the outer peripheral cylindrical portion 11a and the inner peripheral cylindrical portion 11b.
- the sealing device body 2 is fitted into a shaft hole of a housing, which will be described later, the cylindrical portion 11a on the outer peripheral side of the tube portion 11 can be matched with the axis line x of the sealing device body 2 and the axis line of the shaft hole 101. And is fitted into the shaft hole 101.
- An elastic body portion 20 is attached to the reinforcing ring 10 from substantially the outer peripheral side and the outer side, and the elastic body portion 20 is reinforced.
- the elastic body portion 20 includes a base portion 25 that is a portion attached to an inner peripheral end portion of the disk portion 14 of the reinforcing ring 10, and a cylindrical portion 11 of the reinforcing ring 10.
- a gasket portion 26 which is a portion attached from the outer peripheral side, and a rear cover portion 27 which is a portion attached to the reinforcing ring 10 from the outside between the base portion 25 and the gasket portion 26.
- the gasket portion 26 is attached to the inner peripheral side cylindrical portion 11 b of the cylindrical portion 11 of the reinforcing ring 10.
- the outer diameter of the gasket part 26 is larger than the diameter of the inner peripheral surface (refer FIG.
- the gasket portion 26 is compressed in the radial direction between the inner peripheral side cylindrical portion 11b of the reinforcing ring 10 and the shaft hole, and the shaft hole and The space between the reinforcing ring 10 and the inner circumferential side cylindrical portion 11b is sealed. Thereby, between the sealing device main body 2 and a shaft hole is sealed.
- the gasket portion 26 does not have to have an outer diameter that is larger than the diameter of the inner peripheral surface of the shaft hole over the entire direction of the axis x, and in part, the outer diameter is larger than the diameter of the inner peripheral surface of the shaft hole. It may be.
- an annular convex portion having a tip diameter larger than the diameter of the inner peripheral surface of the shaft hole may be formed on the outer peripheral surface of the gasket portion 26.
- the end surface lip 21 extends inwardly (in the direction of arrow a) from the base body part 25 in an annular shape with the axis line x as the center or substantially the center, and the sealing device 1 is desired to be attached to the mounting object.
- the tip portion is formed so as to come into contact with the flange portion 31 of the slinger 3 from the outside with a predetermined tightening margin (slinger contact portion 22a).
- the end surface lip 21 has, for example, a conical cylindrical shape whose diameter increases toward the inner side (arrow a direction) in the axis x direction. That is, as shown in FIGS.
- the end surface lip 21 extends obliquely with respect to the axis x from the base portion 25 to the inner side and the outer peripheral side in a cross section along the axis x (hereinafter also simply referred to as a cross section). ing.
- a plurality of radial projections 23 are provided on the inner peripheral surface 22 of the end surface lip 21, and at least one circumferential projection 24 is provided. Details of the radial protrusion 23 and the circumferential protrusion 24 will be described later.
- the elastic body portion 20 has a dust lip 28 and an intermediate lip 29.
- the dust lip 28 is a lip extending from the base portion 25 toward the axis x, and extends from the base portion 25 in an annular shape with the axis x as the center or substantially the center. Is formed so as to contact the slinger 3 from the outer peripheral side with a predetermined tightening allowance.
- the dust lip 28 has, for example, a conical cylindrical shape whose diameter decreases toward the outside (in the direction of the arrow b) in the direction of the axis x.
- the dust lip 28 prevents foreign matters such as dust and moisture from entering the inside of the sealing device 1 from the outside which is the side opposite to the object to be sealed in use.
- the dust lip 28 may be formed so as not to contact the slinger 3 when the sealing device 1 is used.
- the intermediate lip 29 is a lip that extends inward from the base portion 25 in a substantially L-shaped cross section, and extends from the base portion 25 in an annular shape with the axis x as the center or substantially the center. An annular recess is formed between the base portion 25 and the inside.
- the intermediate lip 29 is not in contact with the slinger 3 in a use state of the sealing device 1 described later. In the state of use, the intermediate lip 29 is in contact with the base portion 25 of the sealed object that has been soaked when the sealed object has penetrated into the interior beyond the slinger contact portion 22a that contacts the slinger 3 of the end surface lip 21. It is formed so as to be accommodated in a recess formed therebetween.
- the intermediate lip 29 may have a conical cylindrical shape that decreases in diameter toward the inner side in the direction of the axis x, as shown in FIGS. The intermediate lip 29 may be formed so as to contact the slinger 3 when the sealing device 1 is in use.
- FIG. 3 is a partially enlarged perspective view of the elastic body portion 20 viewed from the inner peripheral side, and is shown in a state where the elastic body portion 20 in the inner peripheral side portion from the base portion 25 is cut along a plane along the axis x. ing.
- a plurality of radial protrusions 23 are arranged on the same or substantially the same circumference on the inner peripheral surface 22 of the end face lip 21 at equal angular intervals or substantially equal angular intervals in the circumferential direction. Are arranged at equal pitch intervals or substantially equal pitch intervals.
- each radial protrusion 23 extends spirally in the rotational direction of a shaft (slinger 3), which will be described later, from the outer side (lower side in FIG. 3) to the inner side (upper side in FIG. 3).
- each radial protrusion 23 extends from the root 21 b side of the end surface lip 21 toward the tip 21 a side of the end surface lip 21 while being inclined or bent in the rotational direction of the slinger 3.
- each radial protrusion 23 is formed at a distance from the slinger contact portion 22a, and is located on the inner peripheral side (outside) of the slinger contact portion 22a, that is, the root 21b of the end surface lip 21 relative to the slinger contact portion 24. It is formed on the side.
- the radial protrusions 23 are formed at a distance from the slinger contact portion 22a.
- the inner end 23 a that is the inner (outer peripheral) end of the radial protrusion 23 is an outer edge that is an outer (inner peripheral) edge of the slinger contact portion 22 a. It is located at a position with a predetermined gap G in the direction along the axis x along the inner peripheral surface 22 from 22b.
- This gap G is such that the radial projection 23 is at least partially in a region on the inner peripheral side of a region where the pumping action based on the groove 33 of the slinger 3 occurs (pump region) in a use state of the sealing device 1 described later. It is an interval that exists.
- each radial protrusion 23 is formed in a shape that does not come into contact with the slinger 3 when the sealing device 1 is in use. That is, the height from the inner peripheral surface 22 of the radial projection 23 and the interval G are set so that the radial projection 23 does not contact the outer surface of the flange portion 31 of the slinger 3 in the use state.
- the radial protrusion 23 extends from the inner peripheral surface 22 toward the outer end 23 b that is the end portion on the root 21 b side of the end surface lip 21 from the inner end 23 a.
- the height of the radial protrusion 23 from the inner peripheral surface 22 is not limited to this.
- the radial protrusion 23 may have a constant height from the inner peripheral surface 22 from the inner end 23a to the outer end 23b, and the height from the inner peripheral surface 22 toward the outer end 23b from the inner end 23a may be higher. It may be lower. Further, the radial protrusions 23 may have various combinations in which the height from the inner peripheral surface 22 from the inner end 23a to the outer end 23b is increased, decreased, and constant as described above. Moreover, the shape in the cross section orthogonal to the extending direction of the radial protrusion 23 may be various shapes such as a triangle, a quadrangle, and an inverted U shape. Since the radial protrusion 23 is formed in a shape that does not come into contact with the slinger 3 in the usage state of the sealing device 1, the sliding resistance against the slinger 3 is not increased by the radial protrusion 23.
- the shape of the radial protrusion 23 in the extending direction may be a shape that tapers from the outer end 23b toward the inner end 23a, and between the outer end 23b and the inner end 23a.
- the width in the direction orthogonal to the extending direction may be a constant width, or may be various shapes.
- the protrusion 23 may extend straight between the inner end 23a and the outer end 23b or may be bent.
- At least one circumferential protrusion 24 is provided on the inner circumferential surface 22 of the end surface lip 21 on the same or substantially the same circumference with the axis line x as the center or substantially the center. .
- one circumferential protrusion 24 is provided on the end face lip 21.
- the circumferential protrusion 24 extends around the axis x outside the inner end 23a of the radial protrusion 23 (on the root 21b side of the end surface lip 21).
- the circumferential protrusion 24 is provided on the other side (outer side or inner peripheral side) of a pump region to be described later in the sealing device 1.
- the circumferential protrusion 24 is preferably provided in a reflux region described later.
- the circumferential protrusion 24 protrudes from the end surface lip 21 in a region outside the slinger contact portion 22 a in the axis x direction, and the inner end of the circumferential protrusion 24.
- the tip 24a which is a portion, is located outside the slinger contact portion 22a in the axis x direction.
- the circumferential protrusion 24 protrudes inward from the radial protrusion 23 in the direction of the axis x.
- the circumferential protrusion 24 may not protrude from the radial protrusion 23 inward in the axis x direction, and the protrusion amount of the circumferential protrusion 24 in the axis x direction is the protrusion of the radial protrusion 23 in the axis x direction. It may be the same as the amount.
- the shape in the cross section orthogonal to the extending direction of the circumferential protrusion 24 is not limited to a rectangle, and may be various shapes such as a triangle, a quadrangle, and an inverted U shape.
- the outer peripheral surface 24b which is the surface facing the outer peripheral side of the circumferential protrusion 24, is preferably a surface facing the outer peripheral side at least when the sealing device 1 is used, and is a surface extending along the axis x. Preferably, it is a surface that extends obliquely toward the outer peripheral side with respect to the axis line x inclined toward the inner peripheral surface 22 side.
- the elastic body portion 20 includes the end surface lip 21, the base portion 25, the gasket portion 26, the rear cover portion 27, the dust lip 28, and the intermediate lip 29, and these portions are integrated.
- the elastic body portion 20 is integrally formed from the same material.
- the above-described reinforcing ring 10 is made of a metal material, and examples of the metal material include stainless steel and SPCC (cold rolled steel).
- the elastic body of the elastic body portion 20 include various rubber materials.
- the various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluorine rubber (FKM).
- the reinforcing ring 10 is manufactured by, for example, pressing or forging, and the elastic body portion 20 is formed by cross-linking (vulcanization) molding using a molding die. At the time of this cross-linking molding, the reinforcing ring 10 is disposed in the mold, the elastic body portion 20 is bonded to the reinforcing ring 10 by cross-linking adhesion, and the elastic body portion 20 and the reinforcing ring 10 are integrally molded. Is done.
- the slinger 3 is an annular member that is attached to the shaft when the sealing device 1 to be described later is used, and is an annular member that has the axis line x as the center or substantially the center.
- the slinger 3 has a substantially L-shaped cross section, and has a cylindrical portion or a substantially cylindrical cylindrical portion that extends in the axis x direction connected to the flange portion 31 and the inner peripheral end of the flange portion 31. 34.
- the flange portion 31 is a hollow disc-like or substantially hollow disc-like inner circumference side disc portion 31a extending in the radial direction from the cylindrical portion 34, and is wider on the outer circumference side than the inner circumference side disc portion 31a.
- a hollow disk-shaped or substantially hollow disk-shaped outer peripheral disk part 31b extending in the radial direction is connected to an outer peripheral end of the inner peripheral disk part 31a and an inner peripheral end of the outer peripheral disk part 31b.
- a connecting portion 31c is located on the outer side in the axis x direction than the inner peripheral disk part 31a.
- the shape of the flange part 31 is not restricted to the above-mentioned shape, It can be set as various shapes according to application object.
- the flange portion 31 does not have the inner peripheral disc portion 31 a and the connection portion 31 c, and the outer peripheral disc portion 31 b extends to the cylindrical portion 34 and is connected to the cylindrical portion 34. It may be a hollow disk-shaped part or a substantially hollow disk-shaped part extending in the radial direction.
- the lip contact portion 32 which is a portion where the slinger 3 contacts the end surface lip 21, is positioned on the outer surface 31 d which is a surface facing the outer side of the outer peripheral disk portion 31 b in the flange portion 31.
- the outer side surface 31d is preferably a surface along a plane extending in the radial direction.
- a groove 33 is formed on the outer surface 31 d of the flange portion 31 by a concave portion recessed inward.
- the groove 33 is, for example, a screw groove.
- the groove 33 can generate a pump action when the slinger 3 rotates.
- the groove 33 is formed from the inner peripheral side of the lip contact portion 32 to the outer peripheral side of the lip contact portion 32.
- the groove 33 may be formed so as to extend from the inner peripheral end to the outer peripheral end on the outer surface 31d of the outer peripheral disk portion 31b, and is provided in the radial direction of the outer surface 31d including the lip contact portion 32. You may form in the area
- a plurality of grooves 33 are formed on the outer surface 31d of the flange portion 31, and, for example, four screw-shaped grooves 33 are formed on the outer surface 31d of the flange portion 31 as shown in FIG.
- These four screw-like grooves 33 form a four-thread screw.
- the number of the grooves 33 and the shape drawn by extending the grooves 33 may be other than the four-thread screw.
- the groove 33 has, for example, a shape along a line drawn on this plane when a spiral thread groove formed on the conical surface is projected onto a plane perpendicular to the axis of the conical surface.
- the cylindrical portion 34 has at least a cylindrical portion 35 that is a cylindrical or substantially cylindrical portion, and the cylindrical portion 35 is fitted to the shaft. It is formed to be wearable. That is, the inner diameter of the cylindrical portion 35 is smaller than the diameter of the outer peripheral surface of the shaft so that the cylindrical portion 35 can be tightly fitted to the shaft.
- the slinger 3 is not limited to being fixed by the cylindrical portion 35 being fitted to the shaft, and may be fixed by being bonded to the shaft in the cylindrical portion 34, or by other known fixing methods. It may be fixed to the shaft. Note that the entire cylindrical portion 34 may be formed by the cylindrical portion 35.
- the slinger 3 is made of a metal material as a base material.
- the slinger 3 is made of SPCC (cold rolled steel) as a base material and subjected to a rust prevention treatment by applying a phosphate film treatment to the SPCC.
- An example of the phosphate film treatment is a zinc phosphate film treatment.
- the slinger 3 having high rust prevention performance can suppress rust from being generated at the lip contact portion 32 that is a sliding portion with respect to the end lip 21, and can maintain the sealing function and sealing performance of the end lip 21 for a long time. it can. Moreover, it can suppress that the shape of the groove
- the base material of the slinger 3 other metals excellent in rust resistance and rust prevention such as stainless steel may be used. Further, the rust prevention treatment of the base material of the slinger 3 may be other treatment such as metal plating.
- FIG. 5 is a partially enlarged cross-sectional view of the sealing device 1 in a use state in which the sealing device 1 is attached to a shaft 100 inserted in a housing 100 as an attachment target and a shaft hole 101 which is a through hole formed in the housing 100.
- the housing 100 is, for example, a front cover of an engine or a cylinder block and a crankcase
- the shaft hole 101 is a crank hole formed in the front cover or the cylinder block and the crankcase.
- the shaft 102 is, for example, a crankshaft.
- the sealing device main body 2 is press-fitted into the shaft hole 101 and fitted into the shaft hole 101, and the slinger 3 is tightly fitted to the shaft 102 and attached to the shaft 102. It is attached. More specifically, the outer peripheral cylindrical portion 11a of the reinforcing ring 10 comes into contact with the inner peripheral surface 101a of the shaft hole 101, and the shaft center alignment with the shaft hole 101 of the sealing device body 2 is achieved. 20 gasket portions 26 are compressed in the radial direction between the inner peripheral surface 101a of the shaft hole 101 and the inner peripheral side cylindrical portion 11b of the reinforcing ring 10, and the gasket portion 26 is brought into close contact with the inner peripheral surface 101a of the shaft hole 101.
- the cylindrical portion 35 of the slinger 3 is press-fitted into the shaft 102, the inner peripheral surface 35 a of the cylindrical portion 35 is in close contact with the outer peripheral surface 102 a of the shaft 102, and the slinger 3 is fixed to the shaft 102.
- the end surface lip 21 of the elastic body portion 20 is outside the outer disk portion 31b of the flange portion 31 of the slinger 3 at the slinger contact portion 22a which is the portion of the inner peripheral surface 22 on the tip 21a side.
- the relative position in the direction of the axis line x between the sealing device main body 2 and the slinger 3 is determined so as to come into contact with the lip contact portion 32 that is a portion of the side surface 31d.
- the dust lip 28 is in contact with the cylindrical portion 34 of the slinger 3 from the outer peripheral side at the tip side portion.
- the dust lip 28 is in contact with the outer peripheral surface 35 b of the cylindrical portion 35 of the slinger 3.
- the end surface lip 21 is in contact with the lip contact portion 32 of the flange portion 31 at the slinger contact portion 22a so that the slinger 3 is slidable at the lip contact portion 32.
- the lip 21 and the slinger 3 prevent the sealing object such as lubricating oil from seeping out from the sealing object side beyond the slinger contact part 22a and the lip contact part 32.
- the dust lip 28 is in contact with the cylindrical portion 34 so that the cylindrical portion 34 of the slinger 3 is slidable, and prevents foreign matters from entering from the outside to the inside.
- the groove 33 forming the four-thread screw formed on the outer peripheral disk portion 31b of the flange portion 31 of the slinger 3 provides a pump action when the shaft (slinger 3) rotates. .
- a pumping action is generated in a region in the vicinity of the slinger contact portion 22a and the lip contact portion 32 in the sandwiching space S that is a space between the flange portion 31 and the end face lip 21.
- the squeezed sealed object passes from the sandwiched space S beyond the slinger contact part 22a and the lip contact part 32. It is returned to the sealed object side.
- the pumping action of the groove 33 formed in the flange portion 31 of the slinger 3 suppresses the seepage of the sealed object into the sandwiching space S.
- the sealed object that has exuded further outside beyond the region where the pump action is caused by the groove 33 (hereinafter also referred to as the pump region) is adjacent to the pump region on the inner peripheral side by the rotation of the shaft.
- the slinger 3 rotates around the axis x in the rotation direction, and is retained in that region (hereinafter also referred to as a reflux region).
- the end surface lip 21 has a radial protrusion 23 formed on the inner peripheral surface 22, and the radial protrusion 23 extends from the outer edge 22 b of the slinger contact portion 22 a from the position of the gap G, and is at least partially refluxed. Extends into the area. For this reason, the sealed object staying while rotating in the reflux region collides with the radial protrusion 23, or the sealed object staying while rotating in the reflux area is outside the radial protrusion 23 (inner circumferential side) along the radial protrusion 23.
- the end surface lip 21 is formed with a circumferential protrusion 24 on the inner peripheral surface, and the circumferential protrusion 24 extends on the inner peripheral side with respect to the inner end 23a of the radial protrusion 23.
- the region extends in the reflux region.
- the sealed object that stays while rotating in the reflux region collides with the circumferential protrusion 24 and is guided to the radial protrusion 23, and is guided to the pump area by the radial protrusion 23 and receives a pump action to receive the sealed object side.
- the sealed object rotates along the circumferential protrusion 24, and the circumferential protrusion 24 guides the sealed object so that the sealed object stays stably in the reflux region.
- the circumferential protrusion 24 collides the inner peripheral surface 22 of the end surface lip 21 against the sealing object flowing from the tip 21a side to the root 21b side, and from the tip 21a side to the root 21b side of the inner peripheral surface 22 of the sealing object. Stop the flow.
- FIG. 6 shows the flow of the sealed object due to the action of the radial protrusion 23 and the circumferential protrusion 24 of the end lip 21 for explaining the action of the radial protrusion 23 and the circumferential protrusion 24 of the end lip 21.
- FIG. 6 as shown by a broken line F ⁇ b> 1, the sealed object that has exuded to the reflux region side beyond the pump region collides with the side surface 23 c that is the side surface facing the outer peripheral side of the radial protrusion 23, and the pump region side It is bounced back or guided along the side surface 23c of the radial projection 23 to the inner end 23a and returned from the inner end 23a to the pump region.
- the radial protrusion 23 is formed such that a part of the inner peripheral surface 22 of the end surface lip 21 on the inner end 23a side enters the pump region. As will be described later, it is considered that the radial width of the pump region changes depending on the rotational speed of the shaft. For this reason, it is preferable that a part of the radial protrusion 23 on the inner end 23a side is formed so as to enter the pump region regardless of the rotational speed of the shaft. Further, when the entire radial protrusion 23 is formed so as to exist in the return region, the sealed object that has exuded to the return region side beyond the pump region as described above can be returned to the pump region again. In the range, an interval G from the outer edge 22b of the slinger contact portion 22a is set.
- the sealing object that has oozed out of the slinger contact portion 22a and the lip contact portion 32 flows down the inner peripheral surface 22 of the end surface lip 21 from the tip 21a side to the root 21b side by its own weight.
- the outer peripheral surface 24b of the circumferential protrusion 24 is hit and dammed. Therefore, when the slinger 3 is stationary, that is, when the shaft 102 is stationary, the circumferential protrusion 24 can prevent the object to be sealed from oozing out.
- the outer peripheral surface 24b of the circumferential protrusion 24 extends obliquely or bent outwardly with respect to the axis x in order to prevent the sealing object from oozing out to the outside when the slinger 3 is stationary. preferable. This is because the object to be sealed can be easily retained between the inner peripheral surface 22 of the end surface lip 21 and the outer peripheral surface 24b of the circumferential protrusion 24.
- the radial protrusion 23 is adjacent to the adjacent radial protrusion 23 on the rotational direction side of the shaft 102 (slinger 3) and the axis line x. In the direction, it is preferably arranged so as to partially overlap when viewed from the inner peripheral side (outer side) to the outer peripheral side (inner side). As shown by the broken line F4 on the left side of FIG. 6, even if the object to be sealed flows over the side surface 23c of the radial projection 23 on the inner end 23a side and flows toward the root 21b side of the end surface lip 21, the radial projection 23 is exceeded.
- the sealed object hits the side surface 23c of the radial projection 23 adjacent on the rotation direction side of the slinger 3 and bounces back the sealed object or guides the sealed object to the inner end 23a along the side surface 23c. This is because it can be returned to the pump area.
- the slinger 3 is formed on a portion of the radial protrusion 23 that does not overlap with the radial protrusion 23 adjacent to the rotation direction of the slinger 3 when viewed from the outer peripheral side (inner side) to the inner peripheral side (outer side) in the axis x direction.
- the radial projections 23 are arranged so that the radial projections 23 adjacent to each other in the rotational direction 3 partially overlap each other when viewed from the inner circumferential side (outer side) to the outer circumferential side (inner side) in the axis x direction. preferable.
- the adjacent radial protrusions 23 overlap each other when viewed from the inner peripheral side to the outer peripheral side in the axis x direction.
- the radial protrusions 23 are adjacent to each other at equal intervals so that the end lip 21 has the function of the radial protrusions 23 equally in the circumferential direction.
- the squeezed sealed object is removed from the radial protrusion 23 and the circumferential protrusion. 24 can be returned to the pump region, and can further be returned to the sealed object side by the pump action.
- the pump action based on the groove 33 of the slinger 3 decreases as the rotation of the slinger 3 increases. This is considered to be because the pump region contracts toward the slinger contact portion 22a and the lip contact portion 32 as the rotation of the slinger 3 becomes higher. For this reason, when the sealed object oozes out from the sealed object side into the sandwich space S, the sealed object entering the reflux region increases as the rotation of the slinger 3 increases. If the amount of the sealed object that refluxes the reflux region exceeds the amount of the sealed object that can be retained in the reflux region, the sealed object further oozes out, and further outside the sealing device 1. May ooze.
- the squeezed sealed object has a diameter. It can be returned to the pump region by the direction protrusion 23 and the circumferential protrusion 24, and can be returned to the object to be sealed by the pump action.
- the circumferential protrusion 24 can guide the sealed object that has exuded beyond the pump region to the return region so as to be stably retained in the return region.
- the sealed objects remaining in the reflux region are returned to the pump region by the radial protrusions 23 and the circumferential protrusions 24. It is possible to suppress the amount of the sealed object that flows back through the reflux region from exceeding the amount of the sealed object that can remain in the reflux region. Even if the pumping action is reduced by the high rotation of the slinger 3, the sealing object is returned to the pump region by the radial protrusion 23 and the circumferential protrusion 24. The sealing object which can be returned to the side can be increased.
- the circumferential protrusion 24 can guide the sealed object to be stably held in the return region, the amount of the sealed object that can be held in the return region can be increased, and the height of the slinger 3 can be increased. Even if the pumping action is reduced by the rotation, it is possible to prevent the sealed object from leaking further to the outside.
- the sealing device 1 even when the pump action by the groove 33 of the slinger 3 is used, the object to be sealed is used regardless of the value of the rotational speed of the shaft. Exudation of objects can be suppressed.
- the sealing device 4 according to the second embodiment of the present invention is different from the above-described sealing device 1 according to the first embodiment of the present invention in the form of the circumferential protrusion and is changed to the circumferential protrusion 24. And has a circumferential protrusion 41.
- configurations having the same or similar functions as those of the sealing device 1 according to the first embodiment of the present invention described above will be denoted by the same reference numerals, description thereof will be omitted, and different configurations will be described.
- FIG. 7 is a view corresponding to FIG. 3 described above, and is a partially enlarged perspective view of the elastic body portion 20 in the sealing device 4, and the elastic body portion 20 in the portion on the inner peripheral side from the base portion 25 is along the axis x. It is shown cut in the plane.
- the circumferential protrusion 41 extends around the axis line x on the outer side (inner peripheral side) than the inner end 23 a of the radial protrusion 23, similarly to the circumferential protrusion 24 of the sealing device 1 described above. It protrudes from the end surface lip 21 outside the slinger contact portion 22a in the axis x direction.
- a circumferential protrusion 41 is provided on the inner peripheral surface 22 of the end face lip 21 on the same or substantially the same circumference with the axis line x as the center or substantially the center.
- the circumferential projection 41 extends around the axis x on the outer side (the root 21b side of the end surface lip 21) of the radial projection 23, and is, for example, from the pump region in the sealing device 4 Is also provided on the outer side (or the inner peripheral side).
- the circumferential protrusion 41 protrudes from the end lip 21 in a region outside the slinger contact portion 22a in the axis x direction, similarly to the circumferential protrusion 24 described above (see FIGS. 1 and 2).
- the tip 41a which is the inner end of the directional protrusion 41, is located outside the slinger contact portion 22a in the axis x direction.
- the circumferential protrusion 41 is formed in a shape that does not come into contact with the slinger 3 when the sealing device 4 is in use, and the sliding resistance against the slinger 3 is not increased by the circumferential protrusion 41.
- the circumferential protrusion 41 protrudes more inward than the radial protrusion 23 in the axis x direction, like the above-described circumferential protrusion 24 (see FIG. 2).
- the circumferential protrusion 41 may not protrude from the radial protrusion 23 inward in the axial line x direction, and the protruding amount of the circumferential protrusion 41 in the axial line x direction may be in the axial x direction of the radial protrusion 23. It may be the same as the protruding amount.
- the shape in the cross section orthogonal to the extending direction of the circumferential protrusion 41 see FIG.
- the outer peripheral surface 41b which is the surface facing the outer peripheral side of the circumferential protrusion 41, is preferably a surface facing the outer peripheral side at least when the sealing device 4 is in use, and is a surface extending along the axis x. Preferably, it is a surface that extends obliquely toward the outer peripheral side with respect to the axis line x inclined toward the inner peripheral surface 22 side.
- the circumferential projection 41 has a gap 42 between a side surface 23 c of the at least one radial projection 23 facing the side opposite to the rotation direction of the slinger 3.
- the gap 42 is a gap extending in the circumferential direction, and is formed in a part of the width between the radial protrusions 23 adjacent to each other.
- the circumference of the side surface 23c of the radial protrusion 23 on the rotation direction side of the slinger 3 extends in a part of the range opposite to the rotation direction of the slinger 3.
- the direction protrusion 41 is interrupted, and a gap 42 is formed in the circumferential protrusion 41 at the interrupted portion.
- the gaps 42 may be formed in a plurality of spaces between the radial projections 23 adjacent to each other. In the illustrated embodiment, the gaps 42 are formed in all the spaces between the radial projections 23 adjacent to each other. Is formed.
- FIG. 8 is a diagram for illustrating a flow of the sealed object due to the action of the radial protrusion 23 and the circumferential protrusion 41 of the end lip 21.
- the radial protrusion 23 acts on the sealed object to be exuded (broken lines F1, F4)
- the circumferential protrusion 41 is the above-mentioned, as in the above-described sealing device 1. It acts on the sealed object that has oozed out in the same manner as the circumferential protrusion 24 of the sealing device 1 (broken lines F2, F3).
- the circumferential protrusion 41 functions as a weir in the same manner as the circumferential protrusion 24 of the sealing device 1 described above when the shaft 52 is stationary.
- the object to be sealed guided along the side surface 23c toward the inner peripheral end 23a can be returned to the pump region side from the circumferential protrusion 41 through the gap 42 (broken line F5).
- the radial projections 23 and the circumferential projections 42 act on the sealed object returned to the pump region side from the circumferential projection 41 through the gap 42 and can be returned to the pump region. .
- the sealed object that has leaked beyond the circumferential protrusion 41 can be returned to the pump region, and the sealed object can be further suppressed from leaking to the outside.
- the sealing device 4 even when the pump action by the groove 33 of the slinger 3 is used, the object to be sealed is used regardless of the value of the rotational speed of the shaft. Exudation of objects can be suppressed.
- the sealing device 5 according to the third embodiment of the present invention differs from the above-described sealing device 1 according to the first embodiment of the present invention in the form of the elastic body portion.
- components having the same or similar functions are denoted by the same reference numerals, description thereof is omitted, and different portions will be described. .
- FIG. 9 is a cross-sectional view taken along the axis x for illustrating a schematic configuration of the sealing device 5 according to the third embodiment of the present invention
- FIG. 10 is a cross-sectional view taken along the axis x of the sealing device 5. It is a partial expanded sectional view which expands and shows a part.
- the sealing device 5 according to the present embodiment is a sealing device for sealing an annular gap between a shaft and a hole into which the shaft is inserted, similarly to the sealing device 1 described above.
- the sealing device 5 includes a sealing device body 50 corresponding to the sealing device body 2 of the sealing device 1 described above, and a slinger 3.
- the sealing device main body 50 includes a reinforcing ring 10 and an annular elastic body portion 51 around an axis line x formed from an elastic body attached to the reinforcing ring 10.
- the elastic body part 51 has a radial protrusion 52 that is different from the radial protrusion 23 of the elastic body part 20 in the form of the radial protrusions with respect to the elastic body part 20 of the sealing device 1 described above.
- the shape of the circumferential protrusion is different, and the circumferential protrusions 53 and 54 different from the circumferential protrusion 24 of the elastic body portion 20 are provided.
- a plurality of radial protrusions 52 are formed on the inner peripheral surface 22 of the end face lip 21 side by side in the circumferential direction as shown in FIG.
- the radial protrusion 52 extends spirally in the rotational direction of the shaft 102 (slinger 3) from the outer side to the inner side, as will be described later, and the slinger contact portion 22a at the end surface lip 21. It is formed on the inner peripheral side.
- each radial protrusion 52 extends spirally in the rotational direction of the shaft 102 (slinger 3) from the outer side (lower side in FIGS. 11 and 12) to the inner side (upper side in FIGS. 11 and 12). Yes.
- each radial protrusion 52 extends in an inclined direction in the rotational direction of the slinger 3 from the root 21b side of the end face lip 21 toward the tip 21a side.
- Each radial protrusion 52 is formed at a distance from the slinger contact portion 22a, and is formed on the inner peripheral side (outside) of the slinger contact portion 22a, that is, on the root 21b side of the end face lip 21. Yes.
- the radial protrusion 52 is formed at a distance from the slinger contact portion 22 a, as with the above-described radial protrusion 23, and is an end portion on the inner side (outer peripheral side) of the radial protrusion 52.
- the inner end 52a is located at a position with a predetermined gap G from the outer edge 22b of the slinger contact portion 22a in the direction along the axis x along the inner peripheral surface 22 (see FIG. 3).
- the radial protrusion 52 extends along the inner peripheral surface 22 of the end surface lip 21 to a circumferential protrusion 54 described later, and an outer end 52b that is an outer (inner peripheral side) end of the radial protrusion 52 is These are connected to an outer peripheral surface 54b of a circumferential protrusion 54 described later.
- each radial projection 52 is formed in a shape that does not come into contact with the slinger 3 when the sealing device 5 is in use, similarly to the radial projection 23 of the sealing device 1 described above. That is, the height from the inner peripheral surface 22 of the radial projection 52 and the interval G are set so that the radial projection 52 does not contact the outer surface 31 d of the flange portion 31 of the slinger 3 in the use state.
- the radial protrusion 52 has a height from the inner peripheral surface 22 that increases from the inner end 52a toward the outer end 52b.
- the radial protrusion 52 extends over a part of the entire width in the axis x direction of the outer peripheral surface 54b of the circumferential protrusion 54 at the outer end 52b.
- the radial protrusion 52 may extend to the intermediate lip 29, and the outer end 52 b of the radial protrusion 52 may be connected to the outer peripheral surface 29 a that is the outer peripheral surface of the intermediate lip 29. It may extend to a position between the circumferential protrusions 54.
- the radial protrusion 52 is formed in a rib shape on the inner peripheral surface 22 of the end face lip 21 from the outer edge 22b of the slinger contact portion 22a toward the inner peripheral side from the position of the gap G.
- Side surfaces 52c and 52d which are surfaces facing the direction, extend orthogonally or substantially orthogonally to the inner peripheral surface 22 of the end surface lip 21.
- the side surfaces 52c and 52d may be inclined without extending at right angles to the inner peripheral surface 22.
- the side surface 52c may be inclined toward the inner peripheral surface 22 side.
- the side surface 52c and the side surface 52d extend in parallel or substantially in parallel to each other, and the end surface 52e forming the surface on the slinger 3 side of the radial protrusion 52 extends in a planar shape or a substantially planar shape.
- the end surface 52e has a shape of a portion on the inner end 52a side so as to smoothly connect to the inner peripheral surface 22 of the end surface lip 21 at the inner end 52a.
- the part by the side of the inner side end 52a is bent or curved from the other part.
- the height of the radial protrusion 52 from the inner peripheral surface 22 is not limited to the above specific shape.
- the radial protrusion 52 may have a constant height from the inner peripheral surface 22 from the inner end 52a to the outer end 52b, and the height from the inner peripheral surface 22 toward the outer end 52b from the inner end 52a may be higher. It may be lower.
- the radial protrusions 52 may have various combinations in which the height from the inner peripheral surface 22 from the inner end 52a to the outer end 52b is increased, decreased, and constant as described above.
- the shape in the cross section orthogonal to the extending direction of the radial protrusions 52 is not limited to a rectangle, and may be various shapes such as a triangle, a quadrangle, and an inverted U shape. Since the radial protrusion 52 is formed in a shape that does not come into contact with the slinger 3 in the usage state of the sealing device 5, the sliding resistance against the slinger 3 is not increased by the radial protrusion 52.
- the shape of the radial protrusion 52 in the extending direction may be a shape that tapers from the outer end 52b toward the inner end 52a, similar to the radial protrusion 23 described above (see FIG. 3). Between 52b and the inner end 52a, a shape in which the width in a direction orthogonal to the extending direction changes toward the extending direction may be used, or various shapes may be used. Further, the radial protrusion 52 may extend straight between the inner end 52a and the outer end 52b or may be bent.
- At least one circumferential protrusion is provided on the inner circumferential surface 22 of the end surface lip 21 on the same or substantially the same circumference with the axis line x as the center or substantially the center.
- two circumferential protrusions 53 and 54 are provided on the end lip 21 as circumferential protrusions.
- the circumferential protrusion 53 extends around the axis line x on the outer side (outer end 52b side) of the radial protrusion 52, as shown in FIGS. Yes.
- the circumferential protrusion 53 is provided on the inner peripheral side of the pump region in the sealing device 5.
- the circumferential protrusion 53 is preferably provided in the reflux region.
- the circumferential protrusion 53 protrudes from the end surface lip 21 in the outer region in the axis x direction than the slinger contact portion 22 a, and the inner end of the circumferential protrusion 53.
- the tip 53a is located outside the slinger contact portion 22a in the axis x direction.
- the circumferential protrusion 53 protrudes inward from the radial protrusion 52 in the direction of the axis x.
- the circumferential protrusion 53 may not protrude from the radial protrusion 52 inward in the axis x direction, and the protrusion amount of the circumferential protrusion 53 in the axis x direction is the protrusion of the radial protrusion 52 in the axis x direction. It may be the same as the amount.
- the shape in the cross section orthogonal to the extending direction of the circumferential protrusion 53 is not limited to a rectangle, and may be various shapes such as a triangle, a quadrangle, and an inverted U shape.
- the outer peripheral surface 53b which is a surface facing the outer peripheral side of the circumferential protrusion 53, is preferably a surface extending along the axis x at least when the sealing device 5 is used, or inclined toward the inner peripheral surface 22 side.
- a surface extending obliquely toward the outer periphery with respect to the axis x is preferable. That is, it is preferable that the outer peripheral surface 53b of the circumferential protrusion 53 has a conical surface shape or a substantially conical surface shape whose diameter increases toward the inner side in the axis x direction.
- the circumferential protrusion 54 extends around the axis x on the outer side or the inner peripheral side (the root 21 b side of the end face lip 21) than the circumferential protrusion 53. Further, as shown in FIGS. 10 and 12, the circumferential protrusion 54 protrudes from the end surface lip 21 in a region outside the slinger contact portion 22a in the axis x direction, and is an end portion on the inner side of the circumferential protrusion 54. The tip 54a is located outside the slinger contact portion 22a in the axis x direction. Thus, since the circumferential protrusion 54 is formed in a shape that does not come into contact with the slinger 3 when the sealing device 5 is in use, the sliding resistance with respect to the slinger 3 is not increased by the circumferential protrusion 54.
- the circumferential protrusion 54 protrudes more inward than the radial protrusion 52 in the axis x direction.
- the circumferential protrusion 54 may not protrude from the radial protrusion 52 inward in the axis x direction, and the protrusion amount of the circumferential protrusion 54 in the axis x direction is the protrusion of the radial protrusion 52 in the axis x direction. It may be the same as the amount.
- the shape in the cross section orthogonal to the extending direction of the circumferential protrusion 54 is not limited to a rectangle, and may be various shapes such as a triangle, a quadrangle, and an inverted U shape.
- the outer peripheral surface 54b which is the surface facing the outer peripheral side of the circumferential protrusion 54, is preferably a surface extending along the axis x at least when the sealing device 5 is used, or inclined toward the inner peripheral surface 22 side.
- a surface extending obliquely toward the outer periphery with respect to the axis x is preferable. That is, it is preferable that the outer peripheral surface 54b of the circumferential protrusion 54 has a conical surface shape or a substantially conical surface shape whose diameter increases toward the inner side in the axis x direction.
- the radial protrusion 52 extends to the circumferential protrusion 54 on the inner peripheral side, and the outer end 52 b of the radial protrusion 52 is connected to the outer peripheral surface 54 b of the circumferential protrusion 54.
- the circumferential protrusion 54 is formed at a position (range) in which the tip 54a faces the outer disk part 31b in the radial direction.
- the radial protrusion 52 acts on the sealed object that has exuded in the same manner as the radial protrusion 23 in the sealing device 1 (see broken lines F1 and F4 in FIG. 6).
- the circumferential protrusion 53 acts similarly to the circumferential protrusion 24 in the above-described sealing device 1 (F2 and F3 in FIG. 6).
- the circumferential protrusion 54 on the inner peripheral side acts on the sealed object that has leaked further to the outside beyond the circumferential protrusion 53 on the outer peripheral side. Specifically, the circumferential protrusion 54 further strikes the sealed object that has leaked out and rebounds the sealed object to the inner peripheral side.
- the circumferential protrusion 54 has a function of assisting the function of returning the sealed object of the radial protrusion 52 to the pump region.
- the circumferential protrusion 54 can stably hold the object to be sealed in the reflux region, similarly to the circumferential protrusion 53 on the inner peripheral side, and the end surface lip 21 by its own weight when the slinger 3 is stationary.
- the sealed object that flows down from the tip 21a side to the root 21b side of the inner peripheral surface 22 can be blocked.
- the object can be returned to the pump region, and even during the high rotation of the shaft 102 where the pump region is narrowed, many sealed objects can be held in the return region by the circumferential protrusions 53 and 54 and returned to the pump region.
- the amount of the sealed object can be increased.
- the circumferential protrusions 53 and 54 can suppress leakage of the sealed object toward the intermediate lip 28 when the shaft 102 is stationary.
- the sealing device 5 even when the pump action by the groove 33 of the slinger 3 is used, the object to be sealed is used regardless of the value of the rotational speed of the shaft. Exudation of objects can be suppressed.
- FIG. 14 is a view showing a modification of the sealing device 1 according to the first embodiment of the present invention
- FIG. 15 shows a modification of the sealing device 4 according to the second embodiment of the present invention
- FIG. The end lip 21 of the sealing device 1, 4 may have a plurality of circumferential lips.
- the end lip 21 of the sealing device 1, 4 is a circumferential lip 24.
- it may further include a circumferential protrusion 54 that the end face lip 21 of the sealing device 5 has.
- FIG. 16 is a view showing a modified example of the sealing device 5 according to the third embodiment of the present invention.
- the circumferential protrusion 53 of the end surface lip 21 is formed in the circumferential direction of the sealing device 4.
- a gap 42 may be provided between the side surface 52 c facing the direction opposite to the rotation direction of the slinger 3 of at least one radial protrusion 52.
- the gap 42 is formed in all the spaces between the radial protrusions 52 adjacent to each other.
- the radial protrusions 23 and 52 extend spirally, they extend so as to form various shapes on the inner peripheral surface 22 of the end surface lip 21, and the inner peripheral surface 22 of the end surface lip 21. You may arrange
- the groove 33 of the slinger 3 is not limited to the screw (four-thread) shape shown in FIG.
- it may be a groove extending radially from the inner peripheral side toward the outer peripheral side with the axis line x as the center or substantially the center, as shown in FIG. 17 (b).
- a groove extending in a circumferential direction may be used.
- the elastic body portions 20 and 51 have the dust lip 28 and the intermediate lip 29, but the elastic body portions 20 and 51 have the dust lip 28 and the intermediate lip 29. It may not be necessary, and it may have only one of the dust lip 28 and the intermediate lip 29.
- sealing devices 1, 4 and 5 according to the present embodiment are applied to the crank hole of the engine, but the application target of the sealing device according to the present invention is not limited to this, and other The present invention is applicable to all configurations that can utilize the effects of the present invention, such as vehicles, general-purpose machines, and industrial machines.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
- Gasket Seals (AREA)
Abstract
Description
2,50 密封装置本体
3 スリンガ
10 補強環
11 筒部
11a 外周側円筒部
11b 内周側円筒部
11c 接続部
12,14 円盤部
13 錐環部
20,51 弾性体部
21 端面リップ
21a 先端
21b 根元
22 内周面
22a スリンガ接触部
22b 外側縁
23,52 径方向突起
23a,52a 内側端
23b,52b 外側端
23c,23d,52c,52d 側面
24,41,53,54 周方向突起
24a,41a,53a,54a 先端
24b,41b,53b,54b 外周面
25 基体部
26 ガスケット部
27 後方カバー部
28 ダストリップ
29 中間リップ
29a 外周面
31 フランジ部
31a 内周側円盤部
31b 外周側円盤部
31c 接続部
31d 外側面
32 リップ接触部
33 溝
34 筒部
35 円筒部
35a 内周面
35b 外周面
42 間隙
52e 端面
100 ハウジング
101 軸孔
101a 内周面
102 軸
102a 外周面
G 間隔
S 挟空間
x 軸線
Claims (6)
- 軸と該軸が挿入される孔との間の環状の隙間の密封を図るための密封装置であって、
前記孔に嵌着される密封装置本体と、
前記軸に取り付けられるスリンガとを備え、
前記密封装置本体は、軸線周りに環状の補強環と、該補強環に取り付けられている弾性体から形成されている前記軸線周りに環状の弾性体部とを有しており、
前記スリンガは、外周側に向かって延びる前記軸線周りに環状の部分であるフランジ部を有しており、
前記弾性体部は、前記軸線方向において一方の側に向かって延びる、前記フランジ部に前記軸線方向において他方の側から接触する前記軸線周りに環状のリップである端面リップを有しており、
前記スリンガの前記フランジ部の前記他方の側には少なくとも1つの溝が形成されており、
前記端面リップの内周側の面には、複数の径方向突起が周方向に並んで形成されており、また、少なくとも1つの周方向突起が形成されており、
前記径方向突起は、前記他方の側から前記一方の側に向かって前記軸の回転方向に螺旋状に延びており、前記端面リップにおいて前記端面リップが前記スリンガに接触する部分であるスリンガ接触部よりも内周側に形成されており、
前記周方向突起は、前記径方向突起の前記一方の側の端部よりも前記他方の側において、前記軸線周りに延びており、また、前記スリンガ接触部よりも前記軸線方向における前記他方の側において前記端面リップから突出していることを特徴とする密封装置。 - 前記周方向突起は、少なくとも1つの前記径方向突起の前記軸の回転方向とは反対側に面する側面との間に間隙を形成していることを特徴とする請求項1記載の密封装置。
- 前記周方向突起は、前記密封装置におけるポンプ領域よりも前記他方の側に設けられていることを特徴とする請求項1又は2記載の密封装置。
- 前記径方向突起は、前記端面リップにおいて、前記スリンガ接触部から間隔を空けて形成されていることを特徴とする請求項1乃至3のいずれか1項記載の密封装置。
- 前記径方向突起は、前記密封装置における還流領域からポンプ領域に至るように、前記スリンガ接触部から前記間隔を空けて形成されていることを特徴とする請求項4記載の密封装置。
- 前記スリンガに形成された溝はネジ溝であることを特徴とする請求項1乃至5のいずれか1項記載の密封装置。
Priority Applications (6)
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EP18777061.5A EP3604868A1 (en) | 2017-03-28 | 2018-03-26 | Sealing device |
KR1020197031576A KR20190127931A (ko) | 2017-03-28 | 2018-03-26 | 밀봉장치 |
JP2019509838A JP7221197B2 (ja) | 2017-03-28 | 2018-03-26 | 密封装置 |
CN201880023190.5A CN110494681A (zh) | 2017-03-28 | 2018-03-26 | 密封装置 |
US16/576,891 US20200011423A1 (en) | 2017-03-28 | 2019-09-20 | Sealing apparatus |
JP2022182260A JP7429278B2 (ja) | 2017-03-28 | 2022-11-15 | 密封装置 |
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JP2017-063759 | 2017-03-28 | ||
JP2017063759 | 2017-03-28 |
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US16/576,891 Continuation US20200011423A1 (en) | 2017-03-28 | 2019-09-20 | Sealing apparatus |
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WO2018181227A1 true WO2018181227A1 (ja) | 2018-10-04 |
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PCT/JP2018/012236 WO2018181227A1 (ja) | 2017-03-28 | 2018-03-26 | 密封装置 |
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US (1) | US20200011423A1 (ja) |
EP (1) | EP3604868A1 (ja) |
JP (2) | JP7221197B2 (ja) |
KR (1) | KR20190127931A (ja) |
CN (1) | CN110494681A (ja) |
WO (1) | WO2018181227A1 (ja) |
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JP2018204642A (ja) * | 2017-05-31 | 2018-12-27 | 中西金属工業株式会社 | 回転用シール |
US10934970B2 (en) * | 2018-09-10 | 2021-03-02 | Caterpillar Inc. | Crankshaft seal |
DE102020209677A1 (de) * | 2020-07-31 | 2022-02-03 | Aktiebolaget Skf | Lageranordnung |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637172B2 (ja) | 1978-03-10 | 1981-08-29 | ||
JP2000028005A (ja) * | 1998-07-13 | 2000-01-25 | Nok Corp | 密封装置 |
JP2015072058A (ja) * | 2013-10-04 | 2015-04-16 | Nok株式会社 | 密封装置 |
WO2015190450A1 (ja) | 2014-06-10 | 2015-12-17 | Nok株式会社 | 密封装置 |
JP2015232364A (ja) * | 2014-06-10 | 2015-12-24 | Nok株式会社 | 密封装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637172A (en) | 1979-09-05 | 1981-04-10 | Ricoh Co Ltd | Electric charging system in ink jet recorder |
JP6440238B2 (ja) | 2014-03-28 | 2018-12-19 | ダイハツ工業株式会社 | 内燃機関 |
JP6421471B2 (ja) * | 2014-06-17 | 2018-11-14 | Nok株式会社 | 密封装置 |
CN205654870U (zh) * | 2016-05-16 | 2016-10-19 | 无锡恩福油封有限公司 | 密封装置 |
-
2018
- 2018-03-26 KR KR1020197031576A patent/KR20190127931A/ko not_active Application Discontinuation
- 2018-03-26 JP JP2019509838A patent/JP7221197B2/ja active Active
- 2018-03-26 CN CN201880023190.5A patent/CN110494681A/zh active Pending
- 2018-03-26 EP EP18777061.5A patent/EP3604868A1/en not_active Withdrawn
- 2018-03-26 WO PCT/JP2018/012236 patent/WO2018181227A1/ja unknown
-
2019
- 2019-09-20 US US16/576,891 patent/US20200011423A1/en not_active Abandoned
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2022
- 2022-11-15 JP JP2022182260A patent/JP7429278B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637172B2 (ja) | 1978-03-10 | 1981-08-29 | ||
JP2000028005A (ja) * | 1998-07-13 | 2000-01-25 | Nok Corp | 密封装置 |
JP2015072058A (ja) * | 2013-10-04 | 2015-04-16 | Nok株式会社 | 密封装置 |
WO2015190450A1 (ja) | 2014-06-10 | 2015-12-17 | Nok株式会社 | 密封装置 |
JP2015232364A (ja) * | 2014-06-10 | 2015-12-24 | Nok株式会社 | 密封装置 |
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EP3604868A1 (en) | 2020-02-05 |
KR20190127931A (ko) | 2019-11-13 |
JPWO2018181227A1 (ja) | 2020-02-06 |
JP2023017975A (ja) | 2023-02-07 |
CN110494681A (zh) | 2019-11-22 |
JP7429278B2 (ja) | 2024-02-07 |
US20200011423A1 (en) | 2020-01-09 |
JP7221197B2 (ja) | 2023-02-13 |
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