WO2019004141A1 - 密封装置 - Google Patents
密封装置 Download PDFInfo
- Publication number
- WO2019004141A1 WO2019004141A1 PCT/JP2018/024046 JP2018024046W WO2019004141A1 WO 2019004141 A1 WO2019004141 A1 WO 2019004141A1 JP 2018024046 W JP2018024046 W JP 2018024046W WO 2019004141 A1 WO2019004141 A1 WO 2019004141A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sealing device
- slinger
- circumferential
- lip
- axis
- 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
-
- 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
-
- 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
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic 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
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
-
- 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
-
- 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
-
- 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
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
-
- 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
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 In vehicles, general-purpose machines, etc., 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 a sealing object such as lubricating oil, for example. .
- sealing between the shaft and the sealing device is achieved by bringing the seal lip into contact with the shaft or an annular member taken up by the shaft.
- the contact of this seal lip with the shaft for sealing is also a sliding resistance (torque resistance) to the shaft.
- the sealing device is required to reduce the sliding resistance against the shaft due to the demand for low fuel consumption of vehicles etc., and the sliding resistance against the shaft can be reduced while maintaining or improving the sealing performance. Structure is required.
- Patent No. 5637172 gazette International Publication No. 2015/190450
- the present invention has been made in view of the above-mentioned problems, and an object thereof is to suppress the exudation of a sealed object regardless of the value of the rotational speed of the shaft even when the pump action is used.
- 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 the sealing device is fitted in the hole
- a sealing device body and a slinger attached to the shaft the sealing device body being formed around an axis formed by an annular reinforcing ring around an axis and an elastic body attached to the reinforcing ring
- an annular elastic body portion wherein the slinger has a flange portion which is an annular portion around the axis extending toward the outer peripheral side, and the elastic body portion has one side in the axial direction.
- the flange portion extending toward the side of the end face which is an annular lip around the axis in contact with the other side in the axial direction, on the other side of the flange portion of the slinger
- At least Grooves are formed, and at least one circumferential protrusion annularly extending around the axis is formed on the inner peripheral surface of the end surface lip, and the other of the inner peripheral surface of the end surface lip and the flange portion is formed. It is characterized in that it protrudes between the side surfaces.
- the circumferential protrusion has a corrugated shape having asperities.
- the circumferential protrusion is disposed on the inner peripheral side of a slinger contact portion which is a portion where the end face lip contacts the flange portion of the slinger.
- a radial projection extending in the radial direction is formed on the inner circumferential surface of the end face lip in addition to the circumferential projection, and the circumferential projection is the radial projection It is preferable to arrange
- the circumferential protrusion is formed on the end face lip at a predetermined distance from the slinger contact portion to the inner circumferential side.
- the groove formed in the slinger is preferably a screw groove.
- the sealing device of the present invention it is possible to suppress the exudation of the object to be sealed regardless of the value of the rotational speed of the shaft even when the pump action is used.
- FIG. 6 is a partially enlarged perspective view of an elastic body portion in the sealing device shown in FIG. 1, showing the elastic body portion at a portion on the inner peripheral side from the base portion being cut in a plane along the axis.
- FIG. 6 is a partially expanded sectional view of the elastic-body part in the sealing device shown in FIG. It is the figure which looked at the slinger in the sealing apparatus shown in FIG. 1 from the outside.
- FIG. 2 is a partially enlarged cross-sectional view of the sealing device in use, in which the sealing device according to the first embodiment of the present invention is attached to a housing and a shaft inserted into a shaft hole. It is a figure for showing the mode of the flow of the candidate for sealing by the effect of the radial direction projection of an end face lip, and the circumferential direction projection in the sealing device concerning a 1st embodiment of the present invention. It is a partial expanded sectional view which expands and shows a part of section in alignment with an axis of a sealing device concerning a 2nd embodiment of the present invention. It is the perspective view which looked at the sealing device main body of the sealing device which concerns on the 3rd Embodiment of this invention from inner side.
- FIG. 1 is a cross-sectional view in a cross section 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 a first embodiment of the present invention
- FIG. 2 is a partially enlarged cross-sectional view showing a part of a cross section along an axis x of the sealing device 1 in an enlarged manner.
- the 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 in the shaft and housing etc. in a vehicle or a general-purpose machine This shaft is used to seal between the holes (shaft holes) into which the shafts are inserted.
- the sealing device 1 is used to seal an annular space between a crankshaft of an engine and a crank hole which is an axial hole formed in a front cover, a cylinder block and a crankcase.
- the object to which the sealing device 1 according to the first embodiment of the present invention is applied is not limited to the above.
- the direction of arrow a in the direction of axis x (one side in the axial direction) is the inside
- the direction of arrow b in the direction of axis x (the other side in the axial direction)
- the inside is the side of the space to be sealed (the side of the object to be sealed)
- the side of the space where the object to be sealed such as lubricating oil is present
- the outside is the side opposite to the inside .
- the direction away from the axis x is the outer peripheral side
- the direction approaching the axis x (arrow d in Fig. 1) Direction) is the inner circumference side.
- the sealing device 1 includes a sealing device main body 2 which is fitted into a hole to be described later, and a slinger 3 which is attached to a shaft to be described later.
- the sealing device body 2 includes an annular reinforcing ring 10 around an axis x and an annular elastic body 20 around an axis x formed of an elastic body attached to the reinforcing ring 10.
- the slinger 3 has a flange portion 31 which is an annular portion around an axis x extending toward the outer peripheral side (arrow c direction).
- the elastic body portion 20 extends toward one side (inward, arrow a direction) in the axis x direction, and contacts the flange portion 31 from the other side (outward, arrow b direction side) in the axial direction x. And an end face lip 21 which is an annular lip.
- At least one groove 33 is formed on the other side (outside) of the flange portion 31 of the slinger 3, and at least one circumferential direction is formed on the inner peripheral surface (inner peripheral surface 22) of the end face lip 21.
- the protrusions 24 are formed.
- the circumferential protrusion 24 annularly extends around the axis x (see FIG. 3 described later), as described later, and protrudes from the end face lip 21 on the other side in the direction of the axis x from the slinger contact portion 22a. That is, the circumferential protrusion 24 protrudes along the axis x direction between the inner peripheral surface 22 of the end face lip 21 and the outer surface 31 d which is the surface on the other side of the flange portion 31.
- the reinforcing ring 10 is an annular metal member centering on or substantially at the axis x, and the sealing device main body 2 is press-fit in the axial 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 which is a cylindrical portion positioned on the outer peripheral side, a disk portion 12 which is a hollow disk shaped portion extending to the inner peripheral side from an outer end of the cylindrical portion 11 and a disk A conical ring portion 13 which is a conical cylindrical annular portion extending inward from the inner peripheral end of the portion 12 to the inner peripheral side, and from the inner or inner peripheral end of the conical ring 13 to the inner peripheral side It has a disk portion 14 which is a hollow disk-like portion extending in the radial direction and reaching the end portion on the inner peripheral side of the reinforcing ring 10.
- the cylindrical portion 11 of the reinforcing ring 10 is a cylindrical or substantially cylindrical portion located on the outer peripheral side, and on the outer and inner peripheral sides with respect to the outer peripheral cylindrical portion 11a. It has an inner peripheral side cylindrical portion 11b which is a cylindrical or substantially cylindrical portion which extends, and a connecting portion 11c which is a portion which connects the outer peripheral side cylindrical portion 11a and the inner peripheral side cylindrical portion 11b.
- the outer peripheral side cylindrical portion 11 a of the cylindrical portion 11 has an axis x of the sealing device body 2 and an axis of the shaft hole 101 when the sealing device body 2 is fitted into an axial hole 101 of a housing 100 (FIG. 5) described later. To fit in the shaft hole 101 so as to achieve agreement.
- the elastic body portion 20 is attached to the reinforcing ring 10 from the substantially outer peripheral side and the outer side, and the elastic ring portion 20 is reinforced by the reinforcing ring 10.
- the elastic body portion 20 is, as shown in FIGS. 1 and 2, a base portion 25 which is a portion attached to an end portion of the inner peripheral side of the disk portion 14 of the reinforcing ring 10 and a cylindrical portion 11 of the reinforcing ring 10. And a rear cover portion 27 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 portion 26 is larger than the diameter of an inner peripheral surface 101a (see FIG. 6) defining an axial hole 101 described later.
- the gasket portion 26 is radially compressed between the inner peripheral side cylindrical portion 11b of the reinforcing ring 10 and the shaft hole 101, and the shaft The space between the hole 101 and the inner cylindrical portion 11 b of the reinforcing ring 10 is sealed. Thereby, the space between the sealing device body 2 and the axial hole 101 is sealed.
- the outer diameter of the gasket portion 26 does not have to be larger than the diameter of the inner peripheral surface of the shaft hole 101 over the entire axial direction x, and the outer diameter is partially larger than the diameter of the inner peripheral surface of the shaft hole 101 May be larger.
- an annular convex portion having a diameter of the tip larger than the diameter of the inner peripheral surface 101a defining the shaft hole 101 may be formed.
- the end face lip 21 extends from the base portion 25 toward the inside (the direction of the arrow a) in a ring shape centering on or substantially centering on the axis x, and the sealing device 1 is desired In the state of use attached to the position, the tip end portion is formed to contact the flange portion 31 of the slinger 3 from the outside with a predetermined interference (slinger contact portion 22a).
- the end face lip 21 has, for example, a conical cylindrical shape which increases in diameter toward the inner side (the direction of the arrow a) in the direction of the axis x. That is, as shown in FIGS.
- the end face lip 21 extends obliquely from the base portion 25 inward and outward with respect to the axis x in a cross section along the axis x (hereinafter, also simply referred to as a cross section). ing. At least one circumferential protrusion 24 is provided on the inner circumferential surface 22 of the end face lip 21. The details of the circumferential protrusions 24 will be described later.
- the elastic body portion 20 also has a dust lip 28 and an intermediate lip 29.
- the dust lip 28 is a lip extending from the base 25 toward the axis x, and extends from the base 25 in a ring shape centering on or substantially around the axis x, and in the state of use of the sealing device 1 described later Are formed so as to contact the slinger 3 from the outer peripheral side with a predetermined interference.
- the dust lip 28 has, for example, a conical cylindrical shape that reduces in diameter toward the outer side (the direction of the arrow b) in the direction of the axis x.
- the dust lip 28 is intended to prevent foreign matter such as dust and moisture from entering the inside of the sealing device 1 from the outside which is the side opposite to the side of 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 in use.
- the intermediate lip 29 is a lip extending inward from the base 25 in a substantially L-shaped cross section, and extends from the base 25 in an annular shape centering on or substantially centering on the axis x direction.
- An annular recess that opens inward is formed between the base 25 and the base 25.
- the intermediate lip 29 is not in contact with the slinger 3 when the sealing device 1 is in use.
- the intermediate lip 29 intrudes into the sealing object beyond the slinger contact portion 22a where the end face lip 21 and the slinger 3 contact in use, the intruding sealing object is on the dust lip 28 side It is formed to prevent the flow out.
- the intermediate lip 29 may have a conical cylindrical shape which reduces in diameter toward the inside in the axis x direction.
- the middle lip 29 may be formed such that its tip contacts the slinger 3.
- FIG. 3 is a partially enlarged perspective view of the elastic member 20 as viewed from the inner peripheral side, showing the elastic member 20 at a portion inward from the base 25 cut in a plane along the axis x .
- at least one circumferential protrusion 24 on the inner circumferential surface 22 of the end face lip 21 has a constant width on the same or substantially the same circumference centered on or substantially at the axis x It is provided in a ring shape.
- one circumferential protrusion 24 is provided on the end face lip 21.
- the present invention is not limited to this.
- a plurality of circumferential protrusions 24 having different radii are provided with the axis x as the center or substantially center It may be done.
- the circumferential protrusion 24 is provided on the other side (outside or inner circumferential side) than a pump region 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 face lip 21 in a region outside the slinger contact portion 22 a in the direction of the axis x, and the inner end of the circumferential protrusion 24 The tip end face 24a is located outside the slinger contact portion 22a in the direction of the axis x.
- the circumferential protrusions 24 do not increase the sliding resistance to the slinger 3.
- the shape of the cross section perpendicular to the extending direction along the circumferential direction of the circumferential protrusion 24 is not limited to a rectangle, and may be various shapes, for example, a triangle, a square, a trapezoid, an inverted U shape And so on.
- the outer peripheral surface 24b facing the outer peripheral side of the circumferential protrusion 24 is preferably a surface facing the outer peripheral side at least in the use state of the sealing device 1, and is a surface extending along the axis x Preferably, it is a surface inclined to the inner peripheral surface 22 side, and a surface obliquely extending to the outer peripheral side or the inner peripheral side with respect to the axis line x.
- the shape of the cross section perpendicular to the extending direction along the circumferential direction of the circumferential protrusion 24 may be, for example, trapezoidal.
- the shape in this cross section is such that the outer peripheral surface 24b is longer than the inner peripheral surface 24c, which is the surface facing the inner peripheral side of the circumferential protrusion 24, and between the inner peripheral surface 24c and the outer peripheral surface 24b. It is preferable that it is a trapezoidal shape having a tip end surface 24 a inclined so as to be separated from the inner peripheral surface 22 from the inner peripheral side toward the outer peripheral side.
- the circumferential protrusion 24 is formed at an interval G from the slinger contact portion 22a, and on the inner peripheral side (outer side) than the slinger contact portion 22a, that is, the side of the root 21b of the end face lip 21 than the slinger contact portion 22a. Is formed.
- the outer peripheral surface 24b of the circumferential protrusion 24 has a predetermined distance from the outer edge 22b which is the outer (inner peripheral side) edge of the slinger contact portion 22a to the outer peripheral surface 24b. It is located with a gap of G.
- this interval G has a circumferential protrusion 24 in a reflux region described later on the inner peripheral side than a region (pump region) where a pump action based on the groove 33 of the slinger 3 occurs. It is like the interval.
- the circumferential protrusion 24 is formed in a shape and height so as not to contact the slinger 3 in the use state of the sealing device 1. That is, the height and the distance G from the inner circumferential surface 22 of the circumferential protrusion 24 are set such that the circumferential protrusion 24 does not contact the outer surface of the flange portion 31 of the slinger 3 in the use state. That is, the maximum height of the outer peripheral surface 24 b of the circumferential projection 24 is also set to a height that does not contact the outer surface 31 d of the flange portion 31 of the slinger 3. Since the circumferential protrusion 24 does not contact the flange portion 31 of the slinger 3 in the use state of the sealing device 1, the circumferential protrusion 24 does not increase the sliding resistance to the slinger 3.
- the elastic body portion 20 has the end face 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 the respective portions are integrated.
- the elastic body portion 20 is integrally formed of the same material.
- the above-described reinforcing ring 10 is formed of a metal material, and examples of the metal material include stainless steel and SPCC (cold rolled steel). Further, as an elastic body of the elastic body portion 20, for example, there are various rubber materials. Examples of various rubber materials include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), fluororubber (FKM) and the like.
- NBR nitrile rubber
- H-NBR hydrogenated nitrile rubber
- ACM acrylic rubber
- FKM fluororubber
- the reinforcing ring 10 is manufactured, for example, by pressing or forging, and the elastic body portion 20 is formed by crosslinking (vulcanization) molding using a molding die. At the time of this cross-linking molding, the reinforcing ring 10 is disposed in the mold, and 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. Be done.
- the slinger 3 is an annular member attached to the shaft when the sealing device 1 described later is in use, and is an annular member centered on or substantially centered on the axis x.
- the slinger 3 has a substantially L-shaped cross section, and a cylindrical or substantially cylindrical cylindrical portion extending in the axial line x direction connected to the flange portion 31 and the end portion on the inner peripheral side of the flange portion 31 And 34.
- the flange portion 31 is wider at the outer peripheral side than the inner disk portion 31a and the inner disk portion 31a which is a hollow disk-like or substantially hollow disk shape extending in the radial direction from the cylindrical portion 34
- a radially extending hollow disc-like or substantially hollow disc-like outer peripheral disc part 31b is connected to an outer peripheral end of the inner peripheral disc part 31a and an inner peripheral end of the outer peripheral disc part 31b.
- a connection portion 31c is located outside the inner circumferential side disk portion 31 a in the axial line x direction.
- the shape of the flange part 31 is not restricted to the above-mentioned shape, According to an application object, it can be set as various shapes.
- the flange portion 31 does not have the inner peripheral side disk portion 31a and the connection portion 31c, and the outer peripheral side disk portion 31b extends to the cylindrical portion 34 and is connected to the cylindrical portion 34. It may be a hollow disc-like or substantially hollow disc-like portion extending radially.
- the lip contact portion 32 which is a portion where the slinger 3 contacts the end face lip 21, is located on the outer surface 31d, which is a surface facing the outer side of the outer peripheral side disk portion 31b in the flange portion 31.
- the outer side surface 31 d is preferably a surface along a plane which extends in the radial direction.
- channel 33 is formed in the outer surface 31d of the flange part 31 by the recessed part dented inside.
- the groove 33 is, for example, a screw groove. The groove 33 can generate a pump action when the slinger 3 is rotated.
- the groove 33 is formed from the inner peripheral side of the lip contact portion 32 to the region on the outer peripheral side of the lip contact portion 32.
- the groove 33 may be formed to extend from the end on the inner peripheral side to the end on the outer peripheral side in the outer side surface 31 d of the outer peripheral side disk portion 31 b, and one of the radial direction of the outer side surface 31 d including the lip contact portion 32. You may form in the area
- a plurality of grooves 33 are formed on the outer side surface 31 d of the flange portion 31, and for example, four screw-like grooves 33 are formed on the outer side surface 31 d of the flange portion 31 as shown in FIG.
- the four screw-like grooves 33 form four thread screws.
- the number of the grooves 33 and the shape drawn by extending the grooves 33 may be other than four thread screws.
- the groove 33 has, for example, a shape along a line drawn in a plane perpendicular to the axis of the conical surface when the helical thread formed in the conical surface is projected on the plane perpendicular to the axis of the conical surface.
- the cylindrical portion 34 at least partially has a cylindrical portion 35 which is a cylindrical or substantially cylindrical portion, and the cylindrical portion 35 is fitted to the shaft It is designed 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 tightly fitted to the shaft, and may be bonded and fixed to the shaft in the cylindrical portion 34 by other known fixing methods. It may be fixed to the shaft.
- the cylindrical portion 34 may be entirely formed by the cylindrical portion 35.
- Slinger 3 is made of a metal material as a base material, for example, SPCC (cold rolled steel) as a base material, SPCC is subjected to a phosphate coating treatment, and made anticorrosive treatment .
- a phosphate film process there is, for example, a zinc phosphate film process.
- the high anticorrosion performance of the slinger 3 can suppress the occurrence of rust on the lip contact portion 32 which is a sliding portion for the end face lip 21, and maintain the sealing function and sealing performance of the end face lip 21 for a long time it can. Further, the generation of rust can suppress the change in the shape of the groove 33, and can suppress the reduction of the pump effect exerted by the groove 33.
- another metal such as stainless steel, which is excellent in rust resistance and rust resistance may be used.
- the rustproofing process of the base material of the slinger 3 may be another process such as metal plating.
- FIG. 6 is a partially enlarged sectional view of the sealing device 1 in a use state in which the sealing device 1 is attached to a housing 100 to be attached and a shaft 102 inserted in an axial hole 101 which is a through hole formed in the housing 100.
- the housing 100 is, for example, a front cover of the engine, or a cylinder block and a crankcase
- the shaft hole 101 is a front cover, or a crank hole formed in the cylinder block and the crankcase.
- the shaft 102 is, for example, a crankshaft.
- the sealing device main body 2 is press-fit into the shaft hole 101 and fitted into the shaft hole 101, and the slinger 3 is interference-fitted into the shaft 102 and to the shaft 102. It is attached. More specifically, the outer peripheral side cylindrical portion 11a of the reinforcing ring 10 is in contact with the inner peripheral surface 101a of the shaft hole 101 to align the shaft center of the sealing device main body 2 with the shaft hole 101.
- the twenty gasket portions 26 are radially compressed between the inner circumferential surface 101 a of the shaft hole 101 and the inner circumferential cylindrical portion 11 b of the reinforcing ring 10, and the gasket portion 26 is in close contact with the inner circumferential surface 101 a of the shaft hole 101.
- the cylindrical portion 35 of the slinger 3 is press-fitted to the shaft 102, the inner circumferential surface 35a of the cylindrical portion 35 is in close contact with the outer circumferential surface 102a of the shaft 102, and the slinger 3 is fixed to the shaft 102.
- the end face lip 21 of the elastic body portion 20 is outside the outer peripheral side disk portion 31 b of the flange portion 31 of the slinger 3 in the slinger contact portion 22 a which is a portion on the tip 21 a side of the inner peripheral surface 22.
- the relative position in the axis x direction between the sealing device body 2 and the slinger 3 is determined so as to contact the lip contact portion 32 which is a part of the side surface 31 d.
- the dust lip 28 is in contact with the cylindrical portion 34 of the slinger 3 from the outer peripheral side at a portion on the tip end side.
- the dust lip 28 is, for example, in contact with the outer peripheral surface 35 b of the cylindrical portion 35 of the slinger 3.
- the end face lip 21 is in sliding contact with the lip contact portion 32 of the flange portion 31 at the slinger contact portion 22 a, and the end face lip 21 and the slinger 3 Is intended to prevent the object to be sealed such as lubricating oil from leaking from the side of the object to be sealed to the inside beyond the slinger contact portion 22 a and the lip contact portion 32.
- the cylindrical portion 34 of the slinger 3 is slidably in contact with the cylindrical portion 34 to prevent the entry of foreign matter from the outside into the inside.
- the groove 33 forming a four-strip screw formed in the outer peripheral side disk portion 31b of the flange portion 31 of the slinger 3 brings about a pump action when the shaft (slinger 3) rotates. .
- a pumping action is generated in the region near the slinger contact portion 22a and the lip contact portion 32 in the narrow space S which is the space between the flange portion 31 and the end face lip 21.
- the object to be sealed leaks from the side of the object to be sealed into the sandwiching space S by this pump action, the object to be sealed that leaks from the sandwiching space S passes the slinger contact portion 22 a and the lip contact portion 32. It is returned to the sealed object side.
- the pump action generated by the grooves 33 formed in the flange portion 31 of the slinger 3 suppresses the exudation of the object to be sealed into the holding space S.
- the object to be sealed which has leaked to the inner peripheral side beyond the area where the pump action by the groove 33 (hereinafter referred to as the pump area) is generated is the inner peripheral side to the pump area by the rotation of the shaft.
- the adjacent area it rotates around the axis x in the rotational direction of the slinger 3 and stays in that area (hereinafter also referred to as a reflux area).
- the circumferential protrusion 24 is formed in the reflux region of the inner circumferential surface 22 at the end face lip 21. Therefore, the object to be sealed which rotates and stays in the reflux region is the circumferential protrusion It is blocked by the outer peripheral surface 24 b of the outer race 24, and further exuding to the root 21 b side of the end face lip 21 is suppressed. In this case, the sealed object blocked by the circumferential protrusion 24 continues to be stored along the outer circumferential surface 24 b of the circumferential protrusion 24.
- the circumferential projection 24 can continue to store in a state where the object to be sealed is blocked. . That is, the circumferential projection 24 receives an object to be sealed flowing from the tip 21a side to the root 21b side of the end face lip 21 and the sealing object blurs from the tip 21a side to the root 21b of the inner surface 22 I can stop the flow out. Further, since the outer peripheral surface 24b of the circumferential projection 24 is higher than the inner peripheral surface 24c (see FIG. 4), the object to be sealed collides with the outer peripheral surface 24b and is reflected back to the pump region side. After being made, it is returned to the side of the object to be sealed by the pumping action of the groove 33.
- the width in the radial direction of the pump region changes with the rotational speed of the shaft. Therefore, although the circumferential protrusion 24 exists in the reflux region, the outer peripheral surface 24b of the circumferential protrusion 24 enters the pump region when the radial width forming the pump region is expanded according to the rotational speed of the shaft. It may be arranged at such a position.
- the sealing object exuding from the slinger contact portion 22a and the lip contact portion 32 flows from the tip 21a side to the root 21b side on the inner peripheral surface 22 of the end face lip 21 by its own weight.
- the outer circumferential surface 24 b of the circumferential protrusion 24 is hit against and blocked. Therefore, in the stationary state of the slinger 3, that is, in the stationary state of the shaft 102, the circumferential projection 24 can prevent the exudation of the object to be sealed to the outside.
- the outer circumferential surface 24b of the circumferential projection 24 may extend obliquely or curved outward with respect to the axis line x in order to prevent exudation of the sealing object to the outside in the stationary state of the slinger 3 . This is because the object to be sealed can be easily held between the inner peripheral surface 22 of the end face lip 21 and the outer peripheral surface 24 b of the circumferential protrusion 24.
- the sealing device 1 even if the sealed object exudes beyond the pump region where the pumping action is performed to the reflux region, the leaked sealed object is blocked by the circumferential projection 24. As it can be stored and returned to the pump area, it is possible to pump the sealed object back to the sealed object side.
- the pumping action based on the grooves 33 of the slinger 3 decreases as the rotation of the slinger 3 increases. This is considered to be because, as the rotation of the slinger 3 becomes higher, the pump region contracts toward the slinger contact 22a and the lip contact 32 side. For this reason, when the object to be sealed exudes from the side of the object to be sealed to the sandwiching space S, the faster the rotation of the slinger 3 is, the more the object to be sealed entering the reflux area increases. If the amount of the sealed object that refluxes the reflux area exceeds the amount of the sealed object that can be kept in the reflux area, the sealed object further exudes inside the clamping space S, and as a result, Furthermore, it may exude to the outside of the sealing device 1.
- the exuded sealed object is circumferentially surrounded. It can be blocked and returned to the pump area by means of the directional projection 24 and can also be returned to the side to be sealed by pumping.
- the circumferential protrusion 24 can guide the sealing object that has leaked beyond the pump area to the reflux area to stably stay in the reflux area.
- the sealing object remaining in the reflux area can be returned to the pump area by the circumferential projection 24, and the reflux area It is possible to suppress that the amount of the sealed object for refluxing exceeds the amount of the sealed object that can be kept in the reflux area. Further, even if the pump action is reduced by the high rotation of the slinger 3, the object to be sealed can be returned to the pump region by the circumferential projection 24. Therefore, at the high rotation of the slinger 3, the object to be sealed is It is possible to increase the number of sealed objects that can be returned.
- the circumferential projection 24 can guide the sealing object to be stably held in the reflux area, the amount of the sealing object that can be held in the reflux area can be increased, and the height of the slinger 3 can be increased. Even if the pump action is reduced by the rotation, the leakage of the sealed object to the outside of the holding space S can be further suppressed.
- the sealing device 1 As described above, according to the sealing device 1 according to the first embodiment of the present invention, even if the pumping action of the groove 33 of the slinger 3 is used, the object to be sealed regardless of the value of the rotational speed of the shaft It is possible to suppress the exudation of objects.
- the sealing device 64 according to the second embodiment of the present invention is the inner circumferential side of the circumferential projection 24 in addition to the circumferential projection 24 of the sealing device 1 according to the first embodiment of the present invention described above. Is different in that a sub circumferential protrusion 30 is provided.
- the intermediate lip 29 also has a conical cylindrical shape which reduces in diameter toward the inside in the axis x direction, unlike the sealing device 1 in the first embodiment.
- the middle lip 29 does not contact the slinger 3 when the end of the sealing device 64 is in use.
- the present invention is not limited to this, and the middle lip 29 may be formed such that the tip thereof contacts the slinger 3.
- the intruding sealing object is on the dust lip 28 side It is formed to prevent the flow out.
- the sub circumferential protrusion 30 linearly extends inward from the base portion 25 of the elastic body portion 20 along the axis x direction and does not contact the outer surface 31 d of the flange portion 31 of the slinger 3. It extends to a position close to 31d.
- the tip end surface 24a of the circumferential protrusion 24 and the tip surface 30a of the sub circumferential protrusion 30 are flush with each other in the direction perpendicular to the axis x.
- the present invention is not limited to this, and either one may be close to the outer side surface 31 d of the flange portion 31.
- the sub circumferential protrusion 30 is defined by the tip end surface 30a, the outer peripheral surface 30b, and the inner peripheral surface 30c, and the cross-sectional shape perpendicular to the extending direction along the circumferential direction is rectangular.
- this cross-sectional shape is preferably a trapezoidal shape in which the outer peripheral surface 30b is longer than the inner peripheral surface 30c as in the circumferential protrusion 24 (FIG. 4), but the cross-sectional shape is not limited to this.
- the sealing device 64 even if there is a sealing target that has penetrated further into the sandwiching space S beyond the circumferential protrusion 24 of the end face lip 21, the outer circumferential surface 30b of the sub circumferential protrusion 30 seals the sealing target Since it is dammed up, the peripheral projection 24 and the sub circumferential projection 30 can suppress the object to be sealed from leaking out of the holding space S in a double manner.
- the number of the sub circumferential protrusions 30 is not limited to one, and a plurality of the sub circumferential protrusions 30 may be provided.
- the sealing device 4 is different from the sealing device 1 according to the first embodiment of the present invention in the form of circumferential protrusions, and is changed to the circumferential protrusions 24 and has a shape as shown in FIG. A circumferential protrusion 44 is provided.
- components having the same or similar functions as or to those of the sealing device 1 according to the above-described first embodiment of the present invention will be assigned the same reference numerals and descriptions thereof will be omitted, and different configurations will be described.
- FIG. 9 is a view corresponding to FIG. 3 described above, and is a partially enlarged perspective view of the end face lip 21 of the elastic body portion 20 in the sealing device 74.
- the elastic body portion 20 at a portion inside the base portion 25 has an axis x It is shown cut in the plane along the In the sealing device 74, the circumferential projection 44 extends annularly around the axis x, like the circumferential projection 24 of the sealing device 1 described above, and at least one circumferential projection 44 is centered or approximately at the axis x It is annularly provided with a constant width on the same or substantially the same circumference as the center.
- the present invention is not limited to this, and a plurality of circumferential projections 44 with different radii may be provided with the axis x as the center or the approximate center. Similar to the circumferential protrusion 24, the circumferential protrusion 44 is provided on the other side (outside or inner circumferential side) of the pump region in the sealing device 1. The circumferential protrusion 44 is preferably provided in the reflux area.
- the circumferential protrusion 44 protrudes from the end face lip 21 in a region outside the slinger contact portion 22a in the axial x direction, and the tip surface 44a which is the inner end of the circumferential protrusion 44 in the axial x direction It is located outside the slinger contact portion 22a. That is, the circumferential protrusion 44 protrudes between the inner peripheral surface 22 of the end face lip 21 and the outer surface 31 d of the flange portion 31. As described above, since the circumferential protrusion 44 is formed so as not to contact the slinger 3 when the sealing device 74 is in use, the circumferential protrusion 44 does not increase the sliding resistance to the slinger 3.
- the circumferential protrusion 44 is formed in an annular shape extending with a constant width centering on the axis line x, and is formed in a wave shape having unevenness as a whole.
- the circumferential protrusion 44 includes a plurality of concave portions 441 formed in a concave shape as viewed from the inner or outer peripheral side (the upper side in FIG. 9) and a plurality of convex portions 442 formed between the plurality of concave portions 441 There is.
- the recess 441 is a smooth curve and a concave portion formed in a concave curve.
- the convex portion 442 is a convex portion formed in an inverted V shape having a sharp angle.
- the convex portion 442 may be a convex portion formed in a convex curved shape with a smooth curve.
- the circumferential protrusion 44 has a rectangular shape in a cross section perpendicular to the extending direction along the circumferential direction, but the shape is not limited to a rectangle, and may be various shapes, for example, a triangle, a square, a trapezoid, an inverted U shape, etc. And the like.
- the outer peripheral surface 44b facing the outer peripheral side of the circumferential protrusion 44 is preferably a surface facing the outer peripheral side at least in the use state of the sealing device 74 and extending along the axis x, or It is preferable that the surface obliquely extend toward the outer peripheral side with respect to the axis line x.
- the shape of the cross section (see FIG. 2) perpendicular to the extending direction of the circumferential protrusion 44 may be, for example, trapezoidal.
- the outer peripheral surface 44b is longer than the inner peripheral surface 44c, which is the surface facing the inner peripheral side of the circumferential protrusion 44, and between the inner peripheral surface 44c and the outer peripheral surface 44b
- a trapezoidal circumferential projection 44 having a tip surface 44a inclined so as to be away from the inner circumferential surface 22 toward the end is preferable.
- FIG. 10 is a view for showing the flow of the object to be sealed by the action of the circumferential projection 44 of the end face lip 21.
- the circumferential projection 44 is similar to the circumferential projection 24 of the sealing device 1 described above It acts on the sealing object that has leaked into the clamping space S and acts as a weir similar to the circumferential projection 24 of the sealing device 1 in the stationary state of the shaft 102.
- the same function and effect as those of the sealing device 1 in the first embodiment can be obtained. Specifically, beyond the pump region in which the pump action works, further to the reflux region. Even if the sealed object exudes, the exuded sealed object can be blocked and stored by the circumferential projection 44 and can be returned to the pump region, so that it is returned to the sealed object side by the pump action. be able to.
- the circumferential direction protrusion 44 compared with the circumferential direction protrusion 24 in the first embodiment, a large number of objects to be sealed can be held in the concave region of the concave portion 441, so the rotation of the slinger 3 becomes high. Even if the amount of sealed object remaining in the reflux area increases, the increased amount of sealed object can be returned to the pump area while staying in the reflux area. Further, in the sealing device 74, since the object to be sealed flows along the concave shape of the concave portion 441 of the circumferential projection 44, the object to be sealed can be naturally returned to the pump region.
- the sealing device 74 since the sealing target can be stopped by the circumferential projection 44 and the sealing target can be returned to the pump region, the leakage of the sealing target to the outside can be further suppressed. it can.
- the sealing device 74 according to the third embodiment of the present invention even when the pumping action of the groove 33 of the slinger 3 is used, regardless of the value of the rotational speed of the shaft, It is possible to suppress the exudation.
- a sealing device 84 according to a fourth embodiment of the present invention will be described.
- the sealing device 84 according to the fourth embodiment of the present invention is different from the sealing device 74 according to the third embodiment of the present invention in the circumferential direction 44 in addition to the plurality of radial protrusions 23.
- components having the same or similar functions as or to those of the sealing device 74 according to the third embodiment of the present invention described above are denoted by the same reference numerals and descriptions thereof will be omitted, and different configurations will be described.
- FIG. 11 is a view corresponding to FIG. 9 described above, and is a partially enlarged perspective view of the end face lip 21 of the elastic body portion 20 in the sealing device 84.
- the elastic body portion 20 in the portion inside the base portion 25 has an axis x It is shown cut in the plane along the
- the circumferential protrusion 44 of the sealing device 84 is the same as the circumferential protrusion 44 of the sealing device 74 in the third embodiment described above, and extends annularly around the axis x.
- the plurality of radial projections 23 are arranged at equal angular intervals or substantially equal angular intervals in the circumferential direction on the same or substantially the same circumference on the inner circumferential side (outer side) than the circumferential protrusions 44. And arranged at equal pitch intervals or substantially equal pitch intervals.
- the radial projection 23 spirally extends in the rotational direction of the shaft 102 (slinger 3) from the other side (inner peripheral side or outer side) to one side (outer peripheral side or inner side).
- the end face lip 21 is formed on the inner peripheral side of the slinger contact portion 22 a which is a portion contacting the flange portion 31 of the slinger 3 and on the inner peripheral side of the circumferential projection 44. That is, each radial protrusion 23 extends obliquely to the rotational direction of the slinger 3 from the root 21 b side of the end face lip 21 toward the tip end 21 a side.
- the inner end 23 a which is the inner (outer peripheral side) end of the radial projection 23 extends substantially to the center of the recess 441 of the circumferential projection 44 provided along the inner peripheral surface 22 of the end face lip 21.
- the outer end 23 b which is the outer (inner circumferential) end of the radial projection 23 extends to the root 21 b side of the end face lip 21.
- the inner end 23 a of the radial projection 23 and the recess 441 of the circumferential projection 44 are in contact with each other.
- the present invention is not limited to this, and the inner end 23 a of the radial projection 23 and the recess 441 of the circumferential projection 44 may be separated.
- each radial projection 23 is formed in such a shape as not to be in contact with the slinger 3 when the sealing device 84 is in use. That is, the height from the inner circumferential surface 22 of the radial projection 23 is set such that the radial projection 23 does not contact the outer surface 31 d of the flange portion 31 of the slinger 3 in the use state.
- the radial protrusions 23 gradually increase in height from the inner circumferential surface 22 from the inner end 23a to the outer end 23b.
- the radial protrusion 23 is formed in a rib shape on the inner peripheral surface 22 of the end face lip 21 and is formed along the side surface 23c, which is a surface facing the outer peripheral side along the circumferential direction, along the circumferential direction
- the side surface 23 d facing the inner circumferential side extends obliquely with respect to the inner circumferential surface 22 of the end face lip 21.
- the present invention is not limited to this, and the side surfaces 23 c and 23 d may extend orthogonal or substantially orthogonal to the inner circumferential surface 22.
- the height from the inner circumferential surface 22 of the radial projection 23 is not limited to the above specific shape.
- the radial projection 23 may be at a constant height from the inner circumferential surface 22 from the inner end 23a to the outer end 23b, and the height from the inner circumferential surface 22 from the inner end 23a to the outer end 23b is It may be lowered.
- the radial projections 23 may have various combinations such as the height, the height, the height, and the constant height from the inner peripheral surface 22 ranging from the inner end 23a to the outer end 23b.
- vertical to the extension direction of radial direction protrusion 23 may be various shapes, for example, shapes, such as a triangle, a square, a trapezoid, reverse U shape, etc.
- FIG. The radial projection 23 is formed so as not to be in contact with the slinger 3 when the sealing device 84 is in use, so that the radial projection 23 does not increase the sliding resistance to the slinger 3.
- the shape of the radial projection 23 in the direction of extension may be a shape that tapers from the outer end 23b to the inner end 23a, and extends in the extension direction between the outer end 23b and the inner end 23a.
- the width in the orthogonal direction may have a shape that changes in the extension direction, and may have various shapes.
- the radial protrusion 23 may extend straight between the inner end 23 a and the outer end 23 b or may extend in a curved manner.
- radial protrusions 23 present on the inner peripheral side of the circumferential protrusion 44 even if the object to be sealed flows beyond the recess 441 of the circumferential protrusion 44 and flows toward the root 21 b of the end face lip 21.
- the object to be sealed can be repelled, or the object to be sealed can be guided along the side surface 23c to the inner end 23a and then returned to the pump area after the recess 441 of the circumferential projection 44 is once again surmounted.
- the inner peripheral surface 44c is shorter than the outer peripheral surface 44b and the height is lower, the object to be sealed can be easily returned to the pump region side.
- the radial protrusion 23 has another radial protrusion 23 adjacent in the circumferential direction and the axis x It is preferable to be arranged so as to partially overlap when viewed from the inner peripheral side (outer side) to the outer peripheral side (inner side) in the direction.
- the radial projections 23 adjacent to each other from the inner circumferential side in the axis x direction It is preferable to adjust the extension direction (angle) of the radial projections 23 and the interval (pitch) of the radial projections 23 adjacent to each other in order to enlarge the overlapping portion when seen on the outer peripheral side. Further, it is preferable that the radial projections 23 be adjacent to each other at equal intervals so that the end face lip 21 uniformly has the function of the above-mentioned radial projections 23 in the circumferential direction.
- the sealing device 94 according to the fifth embodiment of the present invention is the same as the sealing device 84 according to the fourth embodiment of the present invention described above in the radial direction projection 23 disposed with respect to the circumferential projection 44.
- the positions in the circumferential direction of are different.
- the components having the same or similar functions as those of the sealing device 84 according to the fourth embodiment of the present invention are denoted by the same reference numerals, and the description thereof will be omitted, and different parts will be described. .
- FIG. 12 is a partially enlarged perspective view of the end face lip 21 of the elastic body portion 20 in the sealing device 94.
- the sealing device 94 is a sealing device for sealing an annular gap between the shaft 102 and the hole into which the shaft 102 is inserted, as in the case of the above-mentioned sealing device 84.
- the inner end 23a which is the inner (outer peripheral side) end of the radial projection 23 extends toward the recess of the projection 442 between the recess 441 and the recess 441 of the circumferential projection 44, and the diameter
- An outer end 23 b which is an outer (inner circumferential) end of the directional protrusion 23 extends to the side of the root 21 b of the end face lip 21. That is, although the radial projections 23 in the fifth embodiment are structurally the same as the radial projections 23 in the fourth embodiment, their arrangement is shifted in the circumferential direction.
- the radial projection 23 in the fifth embodiment is disposed at a position closer to the outer peripheral side in the radial direction than the radial projection 23 in the fourth embodiment.
- the sealing object over the projection 44 can be returned to the pump area in a short time by means of the radial projection 23.
- the sealing device 104 according to the sixth embodiment of the present invention is the circumferential projection according to the first embodiment, instead of the circumferential projection 44 of the sealing device 84 according to the fourth embodiment of the present invention described above. 24 differs in that it is used.
- an inner end 23a which is an inner (outer peripheral side) end of the radial protrusion 23 extends toward the inner peripheral surface 24c of the circumferential protrusion 24 and
- the outer end 23 b which is the end on the circumferential side, extends toward the root 21 b of the end face lip 21.
- the annular circumferential protrusions 24 and 44 are used.
- the present invention is not limited thereto.
- a plurality of gaps (grooves) may be provided at regular intervals.
- the sealing object guided to the pump region along the side surface 23 c of the radial protrusion 23 is circumferentially
- the gaps (grooves) of the directional projections 24, 44 can be passed back to the pump area efficiently in a short time.
- the radial projection 23 described above is helically extended, but extends so as to form various shapes on the inner circumferential surface 22 of the end face lip 21, and on the inner circumferential surface 22 of the end face lip 21. It may be disposed spirally. Further, the side surfaces 23c and 23d of the radial protrusion 23 may be flat or curved.
- the groove 33 of the slinger 3 is not limited to the screw (quadruple thread) shape shown in FIG. 4 and may be another shape.
- it may be a groove extending radially from the inner periphery toward the outer periphery centering on or substantially at the axis x, and as shown in FIG. 15 (b).
- the groove may be inclined and extended in the circumferential direction.
- the elastic body portion 20 has the dust lip 28 and the middle lip 29, but the elastic body portion 20 has the dust lip 28 and the middle lip 29. It is not necessary to have only one of the dust lip 28 and the middle lip 29.
- sealing device 1, 64, 74, 84, 94, 104 is applied to the crank hole of the engine
- application object of the sealing device according to the present invention is limited thereto.
- the present invention is applicable to all configurations that can utilize the effects of the present invention, such as other vehicles, general-purpose machines, industrial machines, etc., instead.
- Sealing device main body 3 Slinger 10 Reinforcement ring 11 Cylinder part 11a Outer peripheral cylindrical part 11b Inner peripheral cylindrical part DESCRIPTION OF SYMBOLS 11c ... Connection part, 12, 14 ... Disk part, 13 ... Pyramidal ring part, 20 ... Elastic body part, 21 ... End surface lip, 21a ... Tip, 21b ... Root, 22 ... Inner peripheral surface, 22a ... Slinger contact part, 22b ... outer edge, 23 ... radial projection, 23a ... inner end, 23b ... outer end, 23c, 23d ... side surface, 24, 44 ...
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Abstract
Description
図1は、本発明の第1の実施の形態に係る密封装置1の概略構成を示すための軸線xに沿う断面における断面図であり、図2は、本発明の第1の実施の形態に係る密封装置1の軸線xに沿う断面の一部を拡大して示す部分拡大断面図である。本実施の形態に係る密封装置1は、軸とこの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り、車両や汎用機械において、軸とハウジング等に形成されたこの軸が挿入される孔(軸孔)との間を密封するために用いられる。例えば、エンジンのクランクシャフトとフロントカバーやシリンダブロック及びクランクケースに形成されている軸孔であるクランク孔との間の環状の空間を密封するために用いられる。なお、本発明の第1の実施の形態に係る密封装置1が適用される対象は、上記に限られない。
以下、本発明の第2の実施の形態に係る密封装置64について図8を参照しながら説明する。本発明の第2の実施の形態に係る密封装置64は、上述の本発明の第1の実施の形態に係る密封装置1の周方向突起24に加えて、当該周方向突起24の内周側にサブ周方向突起30が設けられている点が異なる。
次いで、本発明の第3の実施の形態に係る密封装置74について説明する。この密封装置4は、上述の本発明の第1の実施の形態に係る密封装置1に対して、周方向突起の形態が異なり、周方向突起24に変えて、図9に示すような形状の周方向突起44を有している。以下、上述の本発明の第1の実施の形態に係る密封装置1と同一の又は類似する機能を有する構成については同一の符号を付してその説明を省略し、異なる構成について説明する。
続いて、図11に示すように、本発明の第4の実施の形態に係る密封装置84について説明する。本発明の第4の実施の形態に係る密封装置84は、上述の本発明の第3の実施の形態に係る密封装置74に対して、周方向突起44に加え、複数の径方向突起23を有している。以下、上述した本発明の第3の実施の形態に係る密封装置74と同一の又は類似する機能を有する構成については同一の符号を付してその説明を省略し、異なる構成について説明する。
以下、本発明の第5の実施の形態に係る密封装置94について図面を参照しながら説明する。本発明の第5の実施の形態に係る密封装置94は、上述の本発明の第4の実施の形態に係る密封装置84に対して、周方向突起44に対して配置される径方向突起23の周方向における位置が異なっている。以下、上述の本発明の第4の実施の形態に係る密封装置84に対して同一の又は類似する機能を有する構成については同一の符号を付してその説明を省略し、異なる部分について説明する。
以下、本発明の第6の実施の形態に係る密封装置104について図13および図14を参照しながら説明する。本発明の第6の実施の形態に係る密封装置104は、上述の本発明の第4の実施の形態に係る密封装置84の周方向突起44に替えて第1の実施の形態における周方向突起24を用いている点が異なる。
上述した径方向突起23は、螺旋状に延びているとしたが、端面リップ21の内周面22上で種々の形状を形成するように延びており、端面リップ21の内周面22上に螺旋状に配設されていてもよい。また、径方向突起23の夫々の側面23c,23dは、平面状であってもよく、曲面状であってもよい。
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、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面には、前記軸線周りに環状に延びる少なくとも1つの周方向突起が形成され、前記端面リップの内周面と前記フランジ部における前記他方の側の面との間に突出している
ことを特徴とする密封装置。 - 前記周方向突起は、凹凸を有する波形状である
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、前記端面リップが前記スリンガの前記フランジ部に接触する部分であるスリンガ接触部よりも内周側に配置されている
ことを特徴とする請求項1または2に記載の密封装置。 - 前記端面リップの内周面には、前記周方向突起に加えて径方向に沿って延びる径方向突起が形成され、前記周方向突起は前記径方向突起よりも外周側に配置されている
ことを特徴とする請求項1乃至3のいずれか一項に記載の密封装置。 - 前記周方向突起は、前記端面リップにおいて、前記スリンガ接触部から内周側へ所定の間隔を空けて形成されている
ことを特徴とする請求項3に記載の密封装置。 - 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のいずれか一項に記載の密封装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18825532.7A EP3640506A1 (en) | 2017-06-29 | 2018-06-25 | Sealing device |
JP2019526894A JPWO2019004141A1 (ja) | 2017-06-29 | 2018-06-25 | 密封装置 |
KR1020207001797A KR20200018671A (ko) | 2017-06-29 | 2018-06-25 | 밀봉장치 |
CN201880044229.1A CN110832234A (zh) | 2017-06-29 | 2018-06-25 | 密封装置 |
US16/717,061 US20200124178A1 (en) | 2017-06-29 | 2019-12-17 | Sealing apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2017-127327 | 2017-06-29 | ||
JP2017127327 | 2017-06-29 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/717,061 Continuation US20200124178A1 (en) | 2017-06-29 | 2019-12-17 | Sealing apparatus |
Publications (1)
Publication Number | Publication Date |
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WO2019004141A1 true WO2019004141A1 (ja) | 2019-01-03 |
Family
ID=64740667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/024046 WO2019004141A1 (ja) | 2017-06-29 | 2018-06-25 | 密封装置 |
Country Status (6)
Country | Link |
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US (1) | US20200124178A1 (ja) |
EP (1) | EP3640506A1 (ja) |
JP (1) | JPWO2019004141A1 (ja) |
KR (1) | KR20200018671A (ja) |
CN (1) | CN110832234A (ja) |
WO (1) | WO2019004141A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113309856A (zh) * | 2020-02-27 | 2021-08-27 | 卡尔·弗罗伊登伯格公司 | 密封环及其应用 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018204642A (ja) * | 2017-05-31 | 2018-12-27 | 中西金属工業株式会社 | 回転用シール |
JPWO2020045071A1 (ja) * | 2018-08-28 | 2021-08-10 | Nok株式会社 | 密封装置 |
DE102020209677A1 (de) * | 2020-07-31 | 2022-02-03 | Aktiebolaget Skf | Lageranordnung |
CN118176376A (zh) * | 2022-02-08 | 2024-06-11 | 舍弗勒技术股份两合公司 | 密封装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637172B2 (ja) | 1978-03-10 | 1981-08-29 | ||
JP2012117628A (ja) * | 2010-12-02 | 2012-06-21 | Jtekt Corp | 密封装置および転がり軸受 |
JP2015218826A (ja) * | 2014-05-19 | 2015-12-07 | 日本精工株式会社 | 転がり軸受 |
WO2015190450A1 (ja) | 2014-06-10 | 2015-12-17 | Nok株式会社 | 密封装置 |
JP2016044687A (ja) * | 2014-08-19 | 2016-04-04 | キーパー株式会社 | オイルシール |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4183892A (en) * | 1975-02-14 | 1980-01-15 | Federal-Mogul Corporation | Method of working a shaft seal |
US4283063A (en) * | 1979-05-21 | 1981-08-11 | The Mechanex Corporation | Self aligning installation resistant lubricant seal |
DE10246398A1 (de) * | 2002-10-04 | 2004-04-29 | Ina-Schaeffler Kg | Wellenlippendichtung |
JP6000845B2 (ja) * | 2012-12-28 | 2016-10-05 | Nok株式会社 | 密封装置 |
-
2018
- 2018-06-25 KR KR1020207001797A patent/KR20200018671A/ko not_active Application Discontinuation
- 2018-06-25 WO PCT/JP2018/024046 patent/WO2019004141A1/ja unknown
- 2018-06-25 CN CN201880044229.1A patent/CN110832234A/zh active Pending
- 2018-06-25 JP JP2019526894A patent/JPWO2019004141A1/ja active Pending
- 2018-06-25 EP EP18825532.7A patent/EP3640506A1/en not_active Withdrawn
-
2019
- 2019-12-17 US US16/717,061 patent/US20200124178A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5637172B2 (ja) | 1978-03-10 | 1981-08-29 | ||
JP2012117628A (ja) * | 2010-12-02 | 2012-06-21 | Jtekt Corp | 密封装置および転がり軸受 |
JP2015218826A (ja) * | 2014-05-19 | 2015-12-07 | 日本精工株式会社 | 転がり軸受 |
WO2015190450A1 (ja) | 2014-06-10 | 2015-12-17 | Nok株式会社 | 密封装置 |
JP2016044687A (ja) * | 2014-08-19 | 2016-04-04 | キーパー株式会社 | オイルシール |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113309856A (zh) * | 2020-02-27 | 2021-08-27 | 卡尔·弗罗伊登伯格公司 | 密封环及其应用 |
EP3872373A1 (de) * | 2020-02-27 | 2021-09-01 | Carl Freudenberg KG | Dichtring und dessen verwendung |
US11629784B2 (en) | 2020-02-27 | 2023-04-18 | Carl Freudenberg Kg | Sealing ring and use thereof |
CN113309856B (zh) * | 2020-02-27 | 2023-12-22 | 卡尔·弗罗伊登伯格公司 | 密封环及其应用 |
Also Published As
Publication number | Publication date |
---|---|
KR20200018671A (ko) | 2020-02-19 |
JPWO2019004141A1 (ja) | 2020-04-30 |
CN110832234A (zh) | 2020-02-21 |
US20200124178A1 (en) | 2020-04-23 |
EP3640506A1 (en) | 2020-04-22 |
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