WO2018096994A1 - 密封装置および密封構造 - Google Patents
密封装置および密封構造 Download PDFInfo
- Publication number
- WO2018096994A1 WO2018096994A1 PCT/JP2017/041043 JP2017041043W WO2018096994A1 WO 2018096994 A1 WO2018096994 A1 WO 2018096994A1 JP 2017041043 W JP2017041043 W JP 2017041043W WO 2018096994 A1 WO2018096994 A1 WO 2018096994A1
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- WIPO (PCT)
- Prior art keywords
- lip
- grease
- inner peripheral
- axis
- sealing device
- Prior art date
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
- F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
- F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6607—Retaining the grease in or near the bearing
- F16C33/6618—Retaining the grease in or near the bearing in a reservoir in the sealing means
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
- F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
- F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
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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
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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
- F16J15/324—Arrangements for lubrication or cooling of the sealing itself
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
- F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
- F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
- F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
- F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/94—Volume
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6633—Grease properties or compositions, e.g. rheological properties
Definitions
- the present invention relates to a sealing device and a sealing structure, and more particularly to a sealing device and a sealing structure for sealing between an annular outer peripheral member and an annular inner peripheral member that can rotate relative to each other about an axis.
- a hub bearing that rotatably supports wheels In a vehicle such as an automobile, a hub bearing that rotatably supports wheels is in an environment where it is directly exposed to foreign matter such as rainwater, muddy water, and dust.
- a sealing device is attached to the hub bearing in order to seal an internal space formed between the outer ring and the hub that can rotate relative to each other about the axis.
- This sealing device is intended to seal the lubricant inside the hub bearing and prevent foreign matter from entering the inside.
- this sealing device is required to reduce sliding resistance (torque resistance) applied to the hub bearing due to demands for reducing fuel consumption.
- FIG. 11 is a partial cross-sectional view illustrating a schematic configuration of a sealing device (hereinafter also referred to as a hub seal) attached to a conventional hub bearing.
- a sealing device 100 as a conventional hub seal includes an outer ring 201 for sealing an annular space 203 between an outer ring 201 and a hub 202 that are coaxially rotated relative to each other in a hub bearing 200. And the hub 202.
- the sealing device 100 prevents leakage of the lubricant in the bearing ball 204 existing in the space 203 and prevents foreign matter from entering the space 203.
- the sealing device 100 includes a metal reinforcing ring 111 fitted on the inner peripheral surface of the outer ring 201 of the hub bearing 200 and a rubber material integrally formed so as to cover the reinforcing ring 111.
- the elastic body portion 112 is provided.
- the elastic body portion 112 has a side lip 113, an intermediate lip 114 disposed on the inner peripheral side of the side lip 113, and a grease lip 115 extending inwardly inside the intermediate lip 114.
- the lips 113, 114, and 115 are in sliding contact with the outer peripheral surface 202 a of the hub 202.
- the side lip 113 and the intermediate lip 114 mainly prevent foreign matters from entering the space 203 of the hub bearing 200, and the grease lip 115 mainly prevents the leakage of the lubricant of the bearing balls 204 existing in the space 203. I am trying.
- the outer peripheral surface 202a of the hub 202 is formed by machining, and therefore, a finishing trace may be left on the outer peripheral surface 202a.
- this finishing trace has a certain direction, that is, a finishing trace (lead) formed by forming a plurality of groove-shaped traces extending along an axis such as a spiral or a straight line. It may be formed on the outer peripheral surface 202a.
- leads are formed on the outer peripheral surface 202a of the hub 202, the side lip 113 and / or the intermediate lip 114 contact the outer peripheral surface 202a with a larger width exceeding a predetermined contact width (tightening margin). In other words, a so-called solid state may occur.
- the sliding resistance given to the hub 202 by the side lip 113 and / or the intermediate lip 114 when the hub 202 rotates increases, and the driving torque of the hub 202 increases.
- the conventional sealing device 100 when used in the hub bearing 200 including the hub 202 having the lead eyes, the contact width of the side lip 113 and / or the intermediate lip 114 with respect to the hub 202 when the hub 202 rotates. , The sliding resistance (friction torque) to the hub 202 increases, and the driving torque of the hub 202 may increase. For this reason, there is a need for a conventional sealing device that can be stabilized without increasing the driving torque of the hub, even when used in a hub bearing having a hub having lead eyes. It was.
- the present invention has been made in view of the above-described problems, and its purpose is to stabilize the sliding resistance by suppressing an increase in sliding resistance even if lead eyes are formed on the contact object that the lip contacts. It is an object of the present invention to provide a sealing device and a sealing structure that can be made to operate.
- the present invention provides a sealing device that seals between an outer peripheral member that can rotate relative to each other about an axis and an inner peripheral member that is at least partially surrounded by the outer peripheral member. And an annular reinforcing ring arranged around the axis, and an annular elastic body portion attached to the reinforcing ring and made of an elastic body arranged around the axis, the elastic body portion being used
- a side lip extending toward one side of the axis that is formed so as to contact the inner circumferential member from the other side in the axis in the state; and the other side of the inner circumferential member in the use state
- An intermediate lip extending toward the one side on the inner peripheral side of the side lip formed so as to come into contact with the inner peripheral member, and contacting the inner peripheral member from the outer peripheral side in the use state
- a grease lip extending toward the other side of the intermediate lip formed in the manner described above, and the elastic body portion includes the side lip and the intermediate lip in use. The amount of grease applied to the side lip in
- a sealing device that seals between an outer peripheral member that can rotate relative to each other about an axis and an inner peripheral member that is at least partially surrounded by the outer peripheral member, and is disposed around the axis.
- An annular elastic ring, and an annular elastic body portion made of an elastic body attached to the reinforcing ring and arranged around the axis, the elastic body portion being attached to the inner circumferential member in the use state.
- a side lip extending toward one side of the axis that is formed so as to come into contact with the other side of the axis, and a side lip that is formed so as to come into contact with the inner peripheral side member from the other side in the use state.
- a grease lip extending toward the other side of the base, and the elastic body portion includes the intermediate lip, the grease lip, and the inner peripheral side member in a use state. In the enclosing second space, the amount of grease applied to the intermediate lip and the grease lip is 33% or less with respect to the space volume of the second space.
- the side lip, the intermediate lip, and the grease lip are coated with the grease on the inner peripheral side surfaces thereof, and the grease does not contain a urea-based thickener in the thickener. It is characterized by that.
- the side lip, the intermediate lip, and the grease lip are characterized in that a matte portion is formed on the inner peripheral surface thereof.
- the surface roughness of the satin portion is 7 ⁇ mRz or more.
- a sealing structure including a sealing device for sealing, wherein the sealing device includes an annular reinforcing ring arranged around the axis, and an elastic body attached to the reinforcing ring and arranged around the axis A side lip that extends toward one side of the axis that is formed so as to come into contact with the inner peripheral member from the other side of the axis in the state of use.
- An intermediate lip extending toward the one side on the inner peripheral side than the side lip formed so as to contact the inner peripheral member from the other side in the use state;
- a grease lip extending toward the other side of the other side of the intermediate lip formed so as to come into contact with the inner side member from the outer side in the state, and the elastic body portion
- the amount of grease applied to the side lip in the first space surrounded by the side lip, the intermediate lip, and the inner peripheral member is relative to the space volume of the first space.
- the ratio is 21% or less.
- a sealing structure including a sealing device for sealing, wherein the sealing device includes an annular reinforcing ring arranged around the axis, and an elastic body attached to the reinforcing ring and arranged around the axis A side lip that extends toward one side of the axis that is formed so as to come into contact with the inner peripheral member from the other side of the axis in the state of use.
- the amount of grease applied to the intermediate lip and the grease lip in the second space surrounded by the intermediate lip, the grease lip, and the inner peripheral side member in the use state is that of the second space. It is characterized by being 33% or less with respect to the space volume.
- the sealing device and sealing structure which can suppress a raise of sliding resistance and can stabilize sliding resistance are realizable. it can.
- FIG. 1 It is sectional drawing in the cross section in alignment with an axis for showing schematic structure of the sealing device which concerns on embodiment of this invention. It is a partial expanded sectional view which expands and shows the vicinity of the side lip, intermediate
- FIG. 1 A cross section showing an inter-lip space S formed between the side lip, the intermediate lip, and the hub wheel, and an inter-lip space R formed between the intermediate lip, the grease lip, and the hub wheel when the sealing device is in use.
- FIG. 6 is a cross-sectional view for explaining the dimensions of the hub wheel 55.
- FIG. It is a graph which shows the relationship between the application quantity of the grease in Example 1 thru
- It is a fragmentary sectional view for showing a schematic structure of a sealing device attached to a conventional hub bearing.
- FIG. 1 is a cross-sectional view taken along an axis for showing a schematic configuration of a sealing device 1 according to an embodiment of the present invention.
- a sealing device 1 according to the present invention is a sealing device for sealing between an outer peripheral member that can rotate relative to each other about an axis and an inner peripheral member that is at least partially surrounded by the outer peripheral member. The device 1 is used to seal a space between the outer ring 51 and the hub 52 in the hub bearing 50 as described later.
- an arrow a (see FIG. 1) direction is the outside in the axis x direction
- an arrow b (see FIG. 1) direction is the other side in the axial direction) in the axis x direction.
- the outside is a direction away from the space between the outer ring 51 and the hub 52 which is a space to be sealed
- the inside is a direction approaching the space to be sealed.
- the direction away from the axis x is the outer peripheral side
- Direction is the inner circumference.
- the sealing device 1 includes an annular reinforcing ring 10 around an axis x and an annular elastic body portion 20 that is attached to the reinforcing ring 10 and is formed from an elastic body.
- the elastic body portion 20 includes a side lip 21, an intermediate lip 22, and a grease lip (radial lip) 23.
- the side lip 21 is formed so as to come into contact with the hub 52 as an inner peripheral side member from the other side (inner side) in the direction of the axis x in the use state to be described later. It is an annular lip-shaped portion extending in the direction.
- the intermediate lip 22 is formed so as to come into contact with the hub 52 from one side (inner side) in use, and has an annular lip shape extending toward one side (outer side) on the inner peripheral side of the side lip 21.
- the grease lip 23 is formed so as to come into contact with the hub 52 from the outer peripheral side in the use state, and extends toward the other side (inside) on the other side (inner side) in the axis x direction than the intermediate lip 22. It is a lip-shaped part.
- the reinforcing ring 10 is an annular metal member having the axis line x as the center or substantially the center, and is press-fitted into and fitted into an annular through hole 57 of the outer ring 51 of the hub bearing 50 described later.
- the sealing device 1 is fixed to the outer ring 51 by press-fitting the reinforcing ring 10 into the outer ring 51.
- the reinforcing ring 10 includes a cylindrical fitting part 11 located on the outer peripheral side, a position adjusting part 12 extending from the inner end of the fitting part 11 to the inner peripheral side, And a disc-shaped flange portion 13 extending from the outer end of the joint portion 11 to the outer peripheral side.
- the fitting portion 11 is a cylindrical or substantially cylindrical portion having the axis line x as the center or substantially the center, and in the outer peripheral surface 11a that is a peripheral surface on the outer peripheral side, the outer ring 51 in which the through hole 57 is opened outside. It is formed so as to be in close contact with the inner peripheral surface 58a of the outer opening 58 which is a part.
- the position adjusting unit 12 has a shape such that the side lip 21, the intermediate lip 22, and the grease lip 23 are arranged at desired positions in the sealing device 1, and extends outward from the inner end of the fitting unit 11.
- a return portion 12a that is a substantially conical cylindrical shape or a substantially cylindrical portion that returns, a connection flange portion 12b that is a disk-like portion extending from the outer end of the return portion 12a to the inner peripheral side, and an inner portion of the connection flange portion 12b
- a substantially conical cylindrical return portion 12c extending obliquely from the peripheral end to the inner side and the inner peripheral side, and a seal that is a disk-shaped portion extending from the inner peripheral end of the return portion 12c to the inner peripheral side
- a flange portion 12d is a hollow disc shape or a substantially hollow disc shape portion that extends in the radial direction with the axis line x as the center or substantially the center.
- the reinforcing ring 10 is formed as an integral member from a metal plate by pressing or forging, and the fitting portion 11 and the position adjusting portion 12, and the fitting portion 11 and the flange portion 13 are integrally continuous with each other. Combined with cage.
- the metal material of the reinforcing ring 10 include stainless steel and SPCC (cold rolled steel).
- the elastic body portion 20 is attached to the reinforcing ring 10 and is integrally formed with the reinforcing ring 10 so as to cover the reinforcing ring 10 from the outside as shown in FIG.
- the elastic body portion 20 has a base portion 25, and the intermediate lip 22 and the grease lip 23 extend from end portions on the inner peripheral side of the base portion 25. Further, the side lip 21 extends from the base portion 25 so as to be radially separated from the intermediate lip 22 on the outer peripheral side of the intermediate lip 22.
- the base portion 25 is a portion of the elastic body portion 20 that spreads on the outer surface of the reinforcing ring 10 across the flange portion 13, the fitting portion 11, and the position adjusting portion 12 of the reinforcing ring 10. 20 is integrally attached to the reinforcing ring 10 in the base portion 25.
- the side lip 21 extends outward from the base portion 25 in an annular shape with the axis x as the center or substantially the center, and the use of the sealing device 1 described later in which the sealing device 1 is attached to a desired position in the hub bearing 50. In the state, the tip portion is formed so as to contact the hub 52 (hub wheel 55) with a predetermined tightening allowance.
- the side lip 21 has, for example, a conical cylindrical shape whose diameter increases toward the outside in the axis x direction.
- the intermediate lip 22 extends outward from the base portion 25 in an annular shape with the axis x as the center or substantially the center, and the distal end portion of the intermediate lip 22 has a predetermined allowance when the sealing device 1 is used. It is formed so as to contact the ring 55).
- the intermediate lip 22 has, for example, a conical cylindrical shape that increases in diameter toward the outside in the direction of the axis x.
- the intermediate lip 22 may extend outward in parallel with the side lip 21, and may have a gentler inclination with respect to the axis x than the side lip 21, as shown in FIG. 1. The reverse is also possible.
- the grease lip 23 extends in an annular shape from the base portion 25 toward the inner side and the inner peripheral side with the axis x as the center or substantially the center.
- the grease lip 23 is formed so that the tip end portion contacts the hub 52 (hub wheel 55) with a predetermined tightening margin when the sealing device 1 is in use.
- the shape of the grease lip 23 is designed so that the length L in the extending direction and the thickness t in the cross section along the axis x satisfy the relationship of t / L ⁇ 0.27. Yes.
- the length L in the extending direction which is the length in the extending direction of the grease lip 23, is the grease lip base end 23 c that is the base of the grease lip 23 (the connecting portion with the base portion 25) and the grease lip that is the tip of the grease lip 23. This is the distance in the extending direction between the tip 23d.
- the cross-sectional thickness t which is the thickness of the grease lip 23, is a thickness in a direction perpendicular to the extending direction of the grease lip 23 in the cross section along the axis x.
- the thickness (cross-sectional thickness t1) of the grease lip 23 at the grease lip base end 23c of the grease lip 23 shown in FIG. 2 satisfies the relationship t / L ⁇ 0.27. Its shape is designed. That is, the grease lip 23 has a shape that satisfies t1 / L ⁇ 0.27.
- the cross-sectional thickness t of the grease lip 23 is the maximum value at the cross-sectional thickness t1 at the grease lip base end 23c, and the grease lip 23 becomes thinner toward the grease lip end 23d.
- the thickness (cross-sectional thickness t2) of the grease lip at the slip tip 23d is the minimum value.
- the cross-sectional shape of the grease lip 23 may be other shapes.
- the contour of the outer peripheral surface of the grease lip 23 may be a curved line instead of a straight line or a substantially straight line.
- the contour of the inner peripheral side surface 23a of the grease lip 23 is not a straight line or a substantially straight line. It may be a curve.
- the elastic body portion 20 is formed with an outer peripheral ring protrusion 24.
- the outer peripheral ring protrusion 24 is an annular protrusion around the axis line x that is provided on the outer peripheral side of the side lip 21 and protrudes outward.
- the outer end 24 a that is the outer end is connected to the hub 52 (hub wheel 55). It is formed so as to form a gap therebetween.
- the outer peripheral ring protrusion 24 protrudes outward from the outer peripheral end of the base portion 25, and extends around the axis line x as a center or substantially the center. As shown in FIG. 1, the outer peripheral ring protrusion 24 protrudes obliquely from the base portion 25 toward the outside and the outer peripheral side.
- the elastic body portion 20 has a weir portion 26 which is an annular portion protruding toward the outer peripheral side on the outer peripheral side of the outer peripheral ring protrusion 24.
- the weir portion 26 is on the outer peripheral side of the outer end surface 58b (FIG. 4), which is a portion that contacts the sealing device 1 in the axis x direction of the outer ring 51 when the sealing device 1 is attached to the outer ring 51. It is formed so as to protrude.
- the weir portion 26 is formed so as to cover the outer peripheral end of the flange portion 13 of the reinforcing ring 10 on the outer peripheral side.
- the elastic body portion 20 also has a gasket portion 27 that at least partially covers the inner surface of the flange portion 13 of the reinforcing ring 10.
- the gasket portion 27 extends in an annular shape around the axis line x and continues to the end portion on the inner peripheral side of the weir portion 26.
- the elastic body portion 20 is integrally attached to the reinforcing ring 10, and the side lip 21, the intermediate lip 22, the grease lip 23, the outer peripheral ring protrusion 24, the base portion 25, the dam portion 26, and the gasket portion 27 described above are included.
- the elastic body portion 20 is formed as an integral member, and is integrally continuous.
- Examples of the elastic body of the elastic body portion 20 include various rubber materials. Examples of 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 side lip 21, the intermediate lip 22, and the grease lip 23 are formed with matte portions 21b, 22b, and 23b on inner peripheral surfaces (inner peripheral side surfaces 21a, 22a, and 23a).
- the inner peripheral side surface 21a (the surface facing the dotted line in FIG. 2), which is the inner peripheral surface of the side lip 21, is subjected to a satin finish treatment.
- a satin finish treatment On the surface of 21a, minute irregularities are formed to form a satin portion 21b.
- the inner peripheral side surface 21a of the side lip 21 is a matte portion 21b.
- the surface roughness of the satin portion 21b is 7 ⁇ mRz or more. Note that the ten-point average roughness (Rz) defined by JIS conforms to JIS B0601: 1994.
- the inner peripheral side surface 22a (the surface facing the dotted line in FIG. 2) which is the inner peripheral surface of the intermediate lip 22 is subjected to a satin finish, and the inner peripheral side surface 22a On the surface, fine irregularities are formed to form a satin portion 22b.
- the inner peripheral side surface 22a of the intermediate lip 22 is a satin portion 22b.
- the surface roughness of the satin portion 22b is 7 ⁇ mRz or more.
- the inner peripheral side surface 23a (the surface facing the dotted line in FIG. 2) which is the inner peripheral side surface of the grease lip 23 is subjected to a satin finish treatment.
- the surface is formed with fine irregularities to form a satin portion 23b.
- the inner peripheral side surface 23a of the grease lip 23 is a matte portion 23b.
- the surface roughness of the satin portion 23b is 7 ⁇ mRz or more.
- grease G as a lubricant is applied to the inner peripheral side surfaces 21a, 22a, and 23a of the side lip 21, the intermediate lip 22, and the grease lip 23, respectively. That is, as shown in FIG. 2, the grease G may be applied along the dotted lines on the inner peripheral side surfaces 21a, 22a, and 23a. In the use state described later, the sealing device 1 is used with the grease G applied as described above.
- Grease G does not contain a urea-based thickener containing a urea group in the thickener.
- the grease G contains a small amount of a urea-based thickener in the thickener.
- the ratio of the urea-based thickener in the thickener of the grease G is the effect of the grease G described later. It is only necessary that the grease G can be prevented from being scraped off along the lead eyes.
- the grease G a conventionally known grease that satisfies the above-described conditions can be applied.
- the grease G includes a base oil, an additive, and a thickener.
- the following base oil, additive, and thickener are used.
- base oils that can be used are all oils (mineral oil-based, synthetic oil-based or natural oil-based lubricants) that are usually used as base oils for lubricating oils.
- mineral oil-based lubricating oil mineral oil is refined by appropriately combining vacuum distillation, oil removal, solvent extraction, hydrocracking, solvent dewaxing, sulfuric acid washing, clay refining, hydrorefining, etc.
- synthetic oils include hydrocarbon oils, aromatic oils, ester oils, ether oils, and the like.
- natural oil-based lubricating oils include beef tallow, lard, soybean oil, rapeseed oil, rice bran oil, coconut oil, palm oil, palm kernel oil, and other oils and hydrides thereof.
- base oils can be used alone or as a mixture, and are adjusted to a desired base oil kinematic viscosity.
- mineral oil or hydrocarbon oil is preferable.
- Thickeners also include, for example, metal soaps such as metal soaps such as Li and Na, metal soaps such as composite metal soaps whose metal components are Li, Na, Ba, and Ca, and non-soaps such as benton, silica gel, and urethane compounds.
- metal soaps such as metal soaps such as Li and Na
- metal soaps such as composite metal soaps whose metal components are Li, Na, Ba, and Ca
- non-soaps such as benton, silica gel, and urethane compounds.
- Amino acid gelling agents N-2-ethylhexanoyl-L-glutamic acid dibutylamide, N-lauroyl-L-glutamic acid- ⁇ , ⁇ -n-dibutylamide, etc.
- benzylidene sorbitol derivatives dibenzylidene sorbitol, ditrilidene
- Sorbitol asymmetric dialkylbenzylidene sorbitol, etc.
- These thickeners can be used alone or as a mixture.
- Urea-based thickeners include urea compounds and urea / urethane compounds.
- An additive may be added to the grease G depending on the purpose.
- amine-based, phenol-based, sulfur-based, antioxidants such as zinc dithiophosphate and zinc dithiocarbamate, sulfonic acid metal salts, ester-based, amine-based, naphthenic acid metal salts, rust preventives such as succinic acid derivatives, phosphorus
- the addition amount of these additives will not be restrict
- FIG. 3 is a cross-sectional view of the hub bearing 50 in a cross-section along the axis x to show a use state of the sealing device 1 attached to the hub bearing 50
- FIG. 4 is a portion in the vicinity of the sealing device 1 in FIG. It is an expanded sectional view.
- the hub bearing 50 is a conventionally known hub bearing and is provided in a vehicle or the like, and rotatably supports a wheel in an axle or a suspension device.
- the hub bearing 50 is capable of rotating relative to the outer ring 51 and an annular outer ring 51 that is centered or substantially centered on the axis x as the outer peripheral side member.
- a hub 52 is provided as an inner peripheral member centered on or approximately at the partially surrounded axis x, and a plurality of bearing balls 53 disposed between the outer ring 51 and the hub 52.
- the hub 52 includes an inner ring 54 and a hub ring 55.
- the hub ring 55 includes a cylindrical or substantially cylindrical shaft portion 55a extending along the axis x, and a wheel mounting flange 55b. have.
- the wheel mounting flange 55b is a portion that spreads in a disk shape from one end of the shaft portion 55a (the outer end portion of the hub bearing 50) toward the outer periphery, and is a portion to which a wheel (not shown) is attached by a plurality of hub bolts.
- the shaft portion 55a and the wheel mounting flange 55b are smoothly connected on the inner side, and the transition portion 55c, which is the portion where the shaft portion 55a and the wheel mounting flange 55b are connected on the inner side, has an arc shape in a cross section along the axis line x. Or an arc-shaped smooth contour.
- the inner ring 54 is fitted to an end portion on the inner side (arrow b direction side) of the shaft portion 55 a of the hub ring 55 in order to hold the bearing ball 53 in the space between the outer ring 51 and the inner ring 54. In the space between the outer ring 51 and the hub 52, the bearing ball 53 is held by a cage 56.
- the outer ring 51 has an annular through hole 57 extending in the direction of the axis x, and the shaft part 55a of the hub wheel 55 of the hub 52 is inserted into the through hole 57, and the shaft part 55a and the through hole 57 are inserted.
- An annular space extending along the axis x is formed between the two. In this space, the bearing balls 53 are accommodated and held by the cage 56 as described above, and a lubricant is applied or injected.
- the sealing device 1 is attached to the outer opening 58 of the outer ring 51 that forms an opening in which the space between the shaft portion 55a and the through hole 57 is opened outside (arrow a direction side).
- Another sealing device 59 is attached to the inner opening 58 ′ of the outer ring 51, which forms an opening in which the space between the hole 57 is opened inside (arrow b direction side).
- the sealing devices 1 and 59 seal the space between the shaft portion 55a and the inner ring 54 and the through hole 57, and prevent the internal lubricant from leaking to the outside. It is intended to prevent foreign matter from entering the inside.
- the sealing device 59 is a conventionally known sealing device and will not be described in detail. Further, the sealing device 1 can be applied as the sealing device 59. In this case, in the hub bearing 50, the outer side is in the direction of arrow b, and the inner side is in the direction of arrow a.
- the configuration of the hub bearing to which the sealing device 1 is applied is not limited to the configuration of the hub bearing 50 described above.
- the sealing device 1 is attached to the outer opening 58 of the outer ring 51. Specifically, the sealing device 1 is fixed to the outer ring 51 by fitting and fitting the fitting portion 11 of the reinforcing ring 10 into the outer opening 58 of the outer ring 51.
- the outer peripheral surface 11 a of the fitting portion 11 of the reinforcing ring 10 is in close contact with the inner peripheral surface 58 a facing the inner peripheral direction of the outer opening 58 of the outer ring 51, and sealing between the reinforcing ring 10 and the outer ring 51 is performed. It is illustrated.
- FIG. 1 In the state of use, as shown in FIG.
- the reinforcing ring 10 has an annular surface in which the flange portion 13 faces the gasket portion 27 of the elastic body portion 20 extending inward to the outside of the outer opening portion 58.
- the outer ring 51 is attached so as to be pressed against the outer end surface 58b. Thereby, between the outer side end surface 58b and the flange part 13, the gasket part 27 is compressed, and the sealing performance between the outer ring
- the gasket portion 27 is preferably formed with a bead 27 a that is an annular protrusion protruding inward.
- the sealing performance between the outer ring 51 and the sealing device 1 can be further improved on the outer end surface 58b.
- the gasket portion 27 may not have the bead 27a.
- the weir portion 26 of the elastic body portion 20 extends beyond the outer end surface 58b of the outer opening 58 to the outer peripheral side and exceeds the outer peripheral surface 58c facing the outer peripheral direction of the outer opening 58 to the outer peripheral side. It protrudes. For this reason, even when foreign matter such as rainwater, muddy water, and dust moves outward through the outer peripheral surface 58c of the outer opening 58 of the outer ring 51 in the use state, the foreign matter is directed toward the inside of the dam portion 26. It hits the inner side surface 26a, which is a surface, and the movement of the foreign matter further outward is blocked. In this way, foreign matter is prevented from entering the side lip 21 along the outer peripheral surface 58c of the outer opening 58 of the outer ring 51.
- the side lip 21 has a distal end portion corresponding to the above-described predetermined tightening allowance (contact width) at the surface of the hub wheel 55, for example, a surface facing the inner side of the wheel mounting flange 55b (inner surface 55d). ) Is slidably in contact with the hub wheel 55.
- the intermediate lip 22 has a distal end portion corresponding to the above-described predetermined tightening allowance (contact width), and the hub wheel 55 is slidably in contact with the surface of the hub wheel 55, for example, the transition portion 55c. .
- the grease lip 23 has a hub ring on the surface of the hub wheel 55, for example, the outer peripheral surface 55e which is the outer peripheral side surface of the shaft portion 55a, at a portion (contact width) corresponding to the predetermined tightening allowance. 55 is in slidable contact.
- the side lip 21 and the intermediate lip 22 prevent foreign matter from entering the through hole 57, and the grease lip 23 prevents the lubricant from flowing out of the through hole 57.
- the outer end 24a of the outer peripheral ring protrusion 24 faces the inner side surface 55d of the wheel mounting flange 55b of the hub wheel 55 with a minute gap in the axis x direction. It is not in contact with the wheel mounting flange 55b.
- the outer peripheral ring protrusion 24 may form a labyrinth seal by forming a minute space between the outer end 24a and the wheel mounting flange 55b.
- a step 55 f may be formed on the outer peripheral side of the inner surface 55 d of the wheel mounting flange 55 b of the hub wheel 55.
- the outer peripheral portion of the inner side surface 55d is recessed outward from the inner peripheral portion.
- the outer peripheral ring protrusion 24 extends on the outer peripheral side from the step 55f.
- the side lip 21 is in contact with the hub wheel 55 (the wheel mounting flange 55b) at a predetermined tightening margin on the inner peripheral side surface 21a.
- the intermediate lip 22 is in contact with the hub wheel 55 (wheel mounting flange 55b) at a predetermined tightening allowance on the inner peripheral side surface 22a, and the side lip 21, the intermediate lip 22, and the wheel mounting flange 55b of the hub wheel 55 are An inter-lip space S that is an annular space is defined.
- the inter-lip space cross-sectional area A which is the area (cross-sectional area) in the cross-section along the axis x of the inter-lip space S surrounded by the side lip 21, the intermediate lip 22 and the hub wheel 55, is 3.5 mm 2 or more.
- the shapes of the side lip 21 and the intermediate lip 22 are designed such that the inter-lip space cross-sectional area A, which is the cross-sectional area of the inter-lip space S in use, is A ⁇ 3.5 mm 2 . .
- the side lip 21 contacts the inner surface 55d of the wheel mounting flange 55b of the hub wheel 55 with a predetermined tightening margin
- the intermediate lip 22 is wheel mounted with a predetermined tightening margin.
- the flange 55 b contacts the transition portion 55 c
- the grease lip 23 contacts the outer peripheral surface 55 e of the shaft portion 55 a of the hub wheel 55 with a predetermined tightening allowance, so that the sealing device 1 is disposed between the outer ring 51 and the hub 52. The space is sealed.
- the side lip 21, the intermediate lip 22, and the like are formed even when the outer peripheral surface 55e, the transition portion 55c, and the inner surface 55d of the hub wheel 55 are formed with lead marks that are finishing marks of processing. It is possible to suppress the occurrence of solid contact of the grease lip 23. This is because the inter-lip space cross-sectional area A, which is the cross-sectional area of the inter-lip space S surrounded by the side lip 21, the intermediate lip 22, and the hub wheel 55, is 3.5 mm 2 or more. In the conventional sealing device, when the lead ring is formed on the hub ring, the reason why the side lip, intermediate lip, and grease lip become solid is that the lead is in the space surrounded by the side lip, intermediate lip and hub ring.
- the shape of the side lip 21 and the intermediate lip 22 is designed so that the inter-lip space sectional area A in use is 3.5 mm 2 or more. For this reason, even if the hub 52 rotates in the use state, the influence of the pump effect by the lead stitch on the inter-lip space S is low. That is, by setting the inter-lip space cross-sectional area A to A ⁇ 3.5 mm 2 , the influence of the lead pumping effect on the inter-lip space S can be reduced. It is possible to prevent the generation of a negative pressure that increases the contact width of the lips 21 to 23. For this reason, in the sealing device 1, even when lead eyes are formed on the hub wheel 55, an increase in sliding resistance of the side lip 21, the intermediate lip 22, and the grease lip 23 with respect to the hub wheel 55 is suppressed. be able to.
- the upper limit value of the size of the inter-lip space cross-sectional area A can be determined according to a specific form of the sealing device 1 corresponding to a specific application target (hub bearing). Or the upper limit of the magnitude
- the optimum size of the inter-lip space cross-sectional area A of the sealing device 1 is, for example, the size in the radial direction in a specific mode of the sealing device 1, for example, the size of the diameter of the side lip 21 or the intermediate lip 22. Can be set based on.
- the relationship between the cross-sectional thickness t of the grease lip 23 and the length L in the extending direction is t / L ⁇ 0.27.
- the rigidity of the grease lip 23 can be appropriately adjusted, the solid contact of the grease lip 23 can be suppressed, and the increase in sliding resistance of the grease lip 23 with respect to the hub wheel 55 can be suppressed.
- the relationship between the cross-sectional thickness t of the grease lip 23 and the length L in the extending direction is t / L ⁇ 0.27
- the use environment of the sealing device 1 is changed from 20 ° C. to 120 ° C. Even in other words, even when the pressure in the through hole 57 of the hub bearing 50 is changed, the solid contact of the grease lip 23 can be suppressed.
- the inter-lip space sectional area A of the inter-lip space S surrounded by the side lip 21, the intermediate lip 22 and the hub wheel 55 may be 3.5 mm 2 or more.
- the sealing device 1 further suppresses an increase in sliding resistance of the side lip 21, the intermediate lip 22, and the grease lip 23 with respect to the hub wheel 55 by setting the inter-lip space sectional area A to 3.5 mm 2 or more. can do.
- the side lip 21, the intermediate lip 22, and the grease lip 23 are subjected to the matte treatment on the inner peripheral side surfaces 21a to 23a, respectively, and the matte portions 21b to 23b are respectively disposed on the inner peripheral side surfaces 21a to 23a. Is formed.
- the surface roughness of the satin portions 21b to 23b is 7 ⁇ mRz or more. Since the surface roughness of the satin portions 21b to 23b is 7 ⁇ mRz or more as described above, the side lip 21, the intermediate lip 22, the grease lip 23, and the hub wheel are compared with the case where the surface roughness is smaller than 7 ⁇ mRz. The contact area between the 55 lead leads is reduced, and the pump effect can be reduced.
- the surface roughness of the satin portions 21b to 23b is preferably a value of 5 ⁇ mRz or more and 20 ⁇ mRz or less.
- the sealing device 1 As the grease G applied to the lips 21 to 23, grease containing no urea-based thickener or grease containing only a small amount of urea-based thickener is used as the thickener. ing. Therefore, the grease G is prevented from being scraped along the lead eyes when the hub 52 rotates, and it is possible to prevent the generation of negative pressure that increases the contact width of the lips 21 to 23. Thus, an increase in sliding resistance of the side lip 21, the intermediate lip 22, and the grease lip 23 with respect to the hub wheel 55 can be suppressed.
- the space volume V1 of the inter-lip space S as the first space surrounded by the side lip 21, the intermediate lip 22 and the inner side surface 55d of the hub wheel 55 is obtained.
- the ratio of the amount of grease G applied is 21% or less (however, 0% is excluded because the sealing device 1 does not function as a muddy water seal).
- the space volume V2 of the inter-lip space R as the second space surrounded by the intermediate lip 22, the grease lip 23, and the transition portion 55c of the hub wheel 55 is obtained.
- the ratio of the amount of grease G applied is 33% or less (however, 0% is excluded because the sealing device 1 does not function as a muddy water seal).
- the space volume V1 of the inter-lip space S and the space volume V2 of the inter-lip space R are predetermined based on the dimensions of the side lip 21, the intermediate lip 22, the grease lip 23, and the hub wheel 55.
- CAD software for example, “SOLIDWORKS” (registered trademark) of Dassault Systèmes Solid Works) can be easily obtained.
- the lip height a1 of the side lip 21, the inner diameter b1 of the tip 21as of the inner peripheral side surface 21a of the side lip 21, and the inner peripheral side surface of the base end portion 21k of the side lip 21 The inner diameter c1 of the tip 21ks of the intermediate lip 22, the lip height a2 of the intermediate lip 22, the inner diameter b2 of the tip 22as of the inner peripheral side 22a of the intermediate lip 22, and the inner diameter of the tip 22ks of the inner peripheral side of the base end 22k of the intermediate lip 22 c2, the lip height a3 of the grease lip 22, the inner diameter b3 of the tip 23as on the inner peripheral side 23a of the grease lip 22, the inner diameter c3 of the tip 23ks on the inner peripheral side of the base end 23k of the grease lip 23, etc. What is necessary is just to input into CAD software as various parameters required in order to obtain
- the outer diameter d1 of the outer peripheral surface 55e, the R dimension r1 of the transition portion 55c, and the like are required to obtain the space volumes V1 and V2. These may be input to the CAD software as various parameters.
- the sealing device 1 As described above, according to the sealing device 1 according to the embodiment of the present invention, even if lead eyes remain on the surface of the hub wheel 55, the sliding resistance of the lips 21 to 23 with respect to the hub wheel 55 is increased. And the sliding resistance can be stabilized.
- the driving pattern is a pattern in which the hub wheel 55 is initially rotated at 10 rpm for 10 minutes and then the hub wheel 55 is rotated at 1000 rpm for 60 minutes as one cycle.
- the number of cycles is the number of times when the above operation pattern is continuously performed.
- the ambient temperature is the ambient temperature of the atmosphere where the hub bearing 50 is placed.
- the internal pressure of the bearing is a sealing pressure when grease is sealed in the through hole 57 of the hub bearing 50.
- the presence of the direction of the lead in the shaft processing of the hub wheel means that the lead in the processing remains on the surface of the hub wheel 55.
- the amount of grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is 0.02 g
- the intermediate lip forming the inter-lip space R The sliding resistance with the hub wheel 55 was measured when the total amount of the grease G applied to the inner peripheral side surface 22a of 22 and the inner peripheral side surface 23a of the dust lip 23 was 0.03g.
- the volume ratio of the applied amount of grease G to the space volume V1 of the inter-lip space S corresponding to the side lip 21 is 2%
- the inter-lip space R corresponding to the intermediate lip 22 and the dust lip 23 The volume ratio of 0.03 g of grease G applied to the space volume V2 is 6%.
- the amount of grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is 0.15 g
- the inter-lip space R is formed.
- the volume ratio of the applied amount of grease G to the space volume V1 of the inter-lip space S corresponding to the side lip 21 is 16%
- the space R of the inter-lip space R corresponding to the intermediate lip 22 and the dust lip 23 is 16%.
- the volume ratio of 0.13 g of grease G applied to the space volume V2 is 25%.
- the amount of grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is 0.2 g, and the inter-lip space R is formed.
- the volume ratio of the application amount of grease G to the space volume V1 of the inter-lip space S corresponding to the side lip 21 is 21%
- the inter-lip space R corresponding to the intermediate lip 22 and the dust lip 23 The volume ratio of 0.13 g of grease G applied to the space volume V2 is 25%.
- the amount of grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is 0.2 g, and the inter-lip space R is formed.
- the volume ratio of the application amount of grease G to the space volume V1 of the inter-lip space S corresponding to the side lip 21 is 21%
- the inter-lip space R corresponding to the intermediate lip 22 and the dust lip 23 The volume ratio of 0.17 g of grease G applied to the space volume V2 is 33%.
- the amount of grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is 0.22 g
- the inter-lip space R is formed.
- the sliding resistance with the hub wheel 55 was measured when a total amount of 0.41 g of grease G applied to the inner peripheral side surface 22a of the intermediate lip 22 and the inner peripheral side surface 23a of the dust lip 23 was applied.
- the volume ratio of the applied amount of grease G to the space volume V1 of the inter-lip space S corresponding to the side lip 21 is 23%
- the space R of the inter-lip space R corresponding to the intermediate lip 22 and the dust lip 23 is 23%.
- the volume ratio of 0.19 g of grease G applied to the space volume V2 is 37%.
- the amount of grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is 0.4 g, and the inter-lip space R is formed.
- the sliding resistance with the hub wheel 55 was measured when a total amount of 0.72 g of 0.32 g of grease G applied to the inner peripheral side surface 22a of the intermediate lip 22 and the inner peripheral side surface 23a of the dust lip 23 was applied. .
- the volume ratio of the application amount of grease G to the space volume V1 of the inter-lip space S corresponding to the side lip 21 is 42%, and the inter-lip space R corresponding to the intermediate lip 22 and the dust lip 23
- the volume ratio of 0.32 g of grease G applied to the space volume V2 is 63%.
- the torque relative values of the sliding resistance between the side lip 21, the intermediate lip 22, and the grease lip 23 and the hub wheel 55 are 10 to 10 in the first to fourth embodiments as shown in FIG. It was found that there was no increase or disturbance in the torque relative value until the cycle, and the torque relative value was stable in the range of 1 to 1.5. On the other hand, in Comparative Examples 1 and 2, it was found that the torque relative value increased and the torque relative value was disturbed over a wide range of about 1 to 2.7.
- the torque relative value is the relative value of the actual measured sliding resistance from the second cycle to the tenth cycle, based on the average value of the actual measured sliding resistance at 1000 rpm at the first cycle. Say.
- the application amount of the grease G applied to the inner peripheral side surface 21a of the side lip 21 forming the inter-lip space S is based on the space volume of the inter-lip space S based on Examples 1 to 4 and Comparative Examples 1 and 2. It can be seen that the volume ratio is 21% or less with respect to V1.
- the amount of grease G applied to the inner peripheral side surface 22a of the intermediate lip 22 and the inner peripheral side surface 23a of the dust lip 23 forming the inter-lip space R is based on Examples 1 to 4 and Comparative Examples 1 and 2. Thus, it is understood that the volume ratio may be 33% or less with respect to the space volume V2 of the inter-lip space R.
- sealing device 1 according to the present embodiment is applied to the hub bearing 50, but the application target of the sealing device according to the present invention is not limited to this, and other vehicles, general-purpose machines, The present invention is applicable to all configurations that can utilize the effects of the present invention, such as industrial machines.
Abstract
Description
以下、本発明の実施の形態について図面を参照しながら説明する。
次に、このような構成の密封装置1がハブベアリング50のハブ輪55に装着された際、リップ間空間Sを形成するサイドリップ21の内周側面21aに塗布されるグリースGの塗布量と、リップ間空間Rを形成する中間リップ22の内周側面22aおよびダストリップ23の内周側面23aの双方に塗布されるグリースGの塗布量とをそれぞれ変更した場合に、サイドリップ21、中間リップ22、および、グリースリップ23がハブ輪55と接触したときの摺動抵抗を測定した。
運転パターン:10rpm×10min⇒1000rpm×60min/サイクル
サイクル数:10サイクル
雰囲気温度:30℃
ベアリングの内圧力設定:22kPa封入
使用する実機のハブベアリング : ハブ輪の軸加工目にリード目の方向性有り
以上、本発明の好適な実施の形態について説明したが、本発明は上記の実施の形態に係る密封装置1に限定されるものではなく、本発明の概念及び請求の範囲に含まれるあらゆる態様を含む。また、上述した課題及び効果の少なくとも一部を奏するように、各構成を適宜選択的に組み合わせてもよい。例えば、上記実施の形態における各構成要素の形状、材料、配置、サイズ等は、本発明の具体的使用態様によって適宜変更され得る。なお、本実施の形態に係る密封装置1は、摺動抵抗の上昇を抑制する特徴については、多様な任意の組み合わせが可能である。
10,111 補強環
11 嵌合部
11a 外周面
12 位置調整部
12a 戻り部
12b 接続フランジ部
12c 戻り部
12d シールフランジ部
13 フランジ部
20,112 弾性体部
21,113 サイドリップ
21a~23a 内周側面
21b~23b 梨地部
21c サイドリップ先端
22,114 中間リップ
22c 中間リップ基端
22d 中間リップ先端
23,115 グリースリップ
23c グリースリップ基端
23d グリースリップ先端
24 外周環突起
24a 外側端
25 基体部
26 堰部
26a 内側面
27 ガスケット部
27a ビード
50,200 ハブベアリング
51,201 外輪
52,202 ハブ
53,204 ベアリングボール
54 内輪
55 ハブ輪
55a 軸部
55b 車輪取付フランジ
55c 移行部
55d 内側面
55e,202a 外周面
55f 段差
56 保持器
57 貫通孔
58 外側開口部
58a 内周面
58b 外側端面
58c 外周面
58´ 内側開口部
203 空間
A リップ間空間断面積
G グリース
H 中間リップ高さ
L 延び方向長さ
S、R リップ間空間
t,t1,t2 断面厚さ
W リップ間距離
x 軸線
Claims (7)
- 軸線について互いに相対回動可能な外周側部材と該外周側部材に少なくとも部分的に包囲された内周側部材との間を密封する密封装置であって、
前記軸線周りに配置された環状の補強環と、
前記補強環に取り付けられ、前記軸線周りに配置された弾性体からなる環状の弾性体部とを備え、
前記弾性体部は、使用状態において前記内周側部材に前記軸線において他方の側から接触するように形成された前記軸線において一方の側に向かって延びるサイドリップと、前記使用状態において前記内周側部材に前記他方の側から接触するように形成された前記サイドリップよりも内周側において前記一方の側に向かって延びる中間リップと、前記使用状態において前記内周側部材に外周側から接触するように形成された前記中間リップよりも前記他方の側において該他方の側に向かって延びるグリースリップとを有しており、
前記弾性体部は、使用状態において、前記サイドリップと前記中間リップと前記内周側部材とが囲む第1の空間において前記サイドリップに塗布されるグリースの塗布量が前記第1の空間の空間体積に対して21%以下の割合である
ことを特徴とする密封装置。 - 軸線について互いに相対回動可能な外周側部材と該外周側部材に少なくとも部分的に包囲された内周側部材との間を密封する密封装置であって、
前記軸線周りに配置された環状の補強環と、
前記補強環に取り付けられ、前記軸線周りに配置された弾性体からなる環状の弾性体部とを備え、
前記弾性体部は、使用状態において前記内周側部材に前記軸線において他方の側から接触するように形成された前記軸線において一方の側に向かって延びるサイドリップと、前記使用状態において前記内周側部材に前記他方の側から接触するように形成された前記サイドリップよりも内周側において前記一方の側に向かって延びる中間リップと、前記使用状態において前記内周側部材に外周側から接触するように形成された前記中間リップよりも前記他方の側において該他方の側に向かって延びるグリースリップとを有しており、
前記弾性体部は、使用状態において、前記中間リップと前記グリースリップと前記内周側部材とが囲む第2の空間において、前記中間リップおよび前記グリースリップに塗布されるグリースの塗布量が前記第2の空間の空間体積に対して33パーセント以下である
ことを特徴とする密封装置。 - 前記サイドリップ、前記中間リップ、及び前記グリースリップは、各々の内周側面に前記グリースが塗布されており、
前記グリースは、増ちょう剤にウレア系の増ちょう剤を含んでいない
ことを特徴とする請求項1に記載の密封装置。 - 前記サイドリップ、前記中間リップ、及び前記グリースリップは、各々の内周側の面に梨地部が形成されている
ことを特徴とする請求項1または3に記載の密封装置。 - 前記梨地部の表面粗さは、7μmRz以上である
ことを特徴とする請求項4に記載の密封装置。 - 軸線について互いに相対回動可能な外周側部材と、
前記外周側部材に少なくとも部分的に包囲された内周側部材と、
前記外周側部材と前記内周側部材との間を密封する密封装置と
を備えた密封構造であって、
前記密封装置は、
前記軸線周りに配置された環状の補強環と、
前記補強環に取り付けられ、前記軸線周りに配置された弾性体からなる環状の弾性体部とを備え、
前記弾性体部は、使用状態において前記内周側部材に前記軸線において他方の側から接触するように形成された前記軸線において一方の側に向かって延びるサイドリップと、前記使用状態において前記内周側部材に前記他方の側から接触するように形成された前記サイドリップよりも内周側において前記一方の側に向かって延びる中間リップと、前記使用状態において前記内周側部材に外周側から接触するように形成された前記中間リップよりも前記他方の側において該他方の側に向かって延びるグリースリップとを有しており、
前記弾性体部は、使用状態において、前記サイドリップと前記中間リップと前記内周側部材とが囲む第1の空間において前記サイドリップに塗布されるグリースの塗布量は、前記第1の空間の空間体積に対して21%以下の割合である
ことを特徴とする密封構造。 - 軸線について互いに相対回動可能な外周側部材と、
前記外周側部材に少なくとも部分的に包囲された内周側部材と、
前記外周側部材と前記内周側部材との間を密封する密封装置と
を備えた密封構造であって、
前記密封装置は、
前記軸線周りに配置された環状の補強環と、
前記補強環に取り付けられ、前記軸線周りに配置された弾性体からなる環状の弾性体部とを備え、
前記弾性体部は、使用状態において前記内周側部材に前記軸線において他方の側から接触するように形成された前記軸線において一方の側に向かって延びるサイドリップと、前記使用状態において前記内周側部材に前記他方の側から接触するように形成された前記サイドリップよりも内周側において前記一方の側に向かって延びる中間リップと、前記使用状態において前記内周側部材に外周側から接触するように形成された前記中間リップよりも前記他方の側において該他方の側に向かって延びるグリースリップとを有しており、
前記弾性体部は、使用状態において、前記中間リップと前記グリースリップと前記内周側部材とが囲む第2の空間において、前記中間リップおよび前記グリースリップに塗布されるグリースの塗布量が前記第2の空間の空間体積に対して33パーセント以下である
ことを特徴とする密封構造。
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CN201780073239.3A CN110036214B (zh) | 2016-11-25 | 2017-11-15 | 密封装置及密封构造 |
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EP17873728.4A EP3536997B1 (en) | 2016-11-25 | 2017-11-15 | Sealing apparatus and sealing structure |
JP2018552521A JP7199225B2 (ja) | 2016-11-25 | 2017-11-15 | 密封装置および密封構造 |
US16/417,881 US11578757B2 (en) | 2016-11-25 | 2019-05-21 | Sealing apparatus and sealing structure |
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KR20190069587A (ko) | 2019-06-19 |
KR102213573B1 (ko) | 2021-02-08 |
US11578757B2 (en) | 2023-02-14 |
JP7199225B2 (ja) | 2023-01-05 |
US20190271359A1 (en) | 2019-09-05 |
CN110036214A (zh) | 2019-07-19 |
EP3536997A1 (en) | 2019-09-11 |
EP3536997A4 (en) | 2020-07-15 |
EP3536997B1 (en) | 2022-06-01 |
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