WO2016080203A1 - 密封構造 - Google Patents
密封構造 Download PDFInfo
- Publication number
- WO2016080203A1 WO2016080203A1 PCT/JP2015/081261 JP2015081261W WO2016080203A1 WO 2016080203 A1 WO2016080203 A1 WO 2016080203A1 JP 2015081261 W JP2015081261 W JP 2015081261W WO 2016080203 A1 WO2016080203 A1 WO 2016080203A1
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- WO
- WIPO (PCT)
- Prior art keywords
- peripheral surface
- lip
- cylindrical portion
- fluid
- sealed
- 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
- F16J15/164—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
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/124—Elastomeric springs
- F16F15/126—Elastomeric springs consisting of at least one annular element surrounding the axis of rotation
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
- F16F15/1407—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers the rotation being limited with respect to the driving means
- F16F15/1414—Masses driven by elastic elements
- F16F15/1435—Elastomeric springs, i.e. made of plastic or rubber
- F16F15/1442—Elastomeric springs, i.e. made of plastic or rubber with a single mass
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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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
- F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
- F16J15/126—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement consisting of additions, e.g. metallic fibres, metallic powders, randomly dispersed in the packing
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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
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
- F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
- F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
-
- 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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/30—Sealing arrangements
Definitions
- the present invention relates to a sealing structure including a torsional vibration damper.
- FIG. 3 is a schematic cross-sectional view of a sealing structure according to a conventional example.
- the torsional vibration damper 600 has a cylindrical portion 610 attached to the crankshaft 300.
- the oil seal 500 includes a reinforcing ring 510 and an elastic seal body 520 provided integrally with the reinforcing ring 510.
- the reinforcing ring 510 includes a cylindrical portion 511 and an inward flange portion 512 provided at an end of the cylindrical portion 511 opposite to the fluid to be sealed.
- the seal body 520 is provided on the opposite side of the oil lip 521 from the sealing target fluid side with respect to the oil lip 521 slidably provided with respect to the outer peripheral surface of the cylindrical portion 610, and And a dust strip 522 slidably provided on the outer peripheral surface.
- a side lip 523 is provided on the seal body 520.
- the side lip 523 expands from the atmosphere side toward the side opposite to the fluid to be sealed so that foreign matter does not easily enter the sliding portion between the dust strip 522 and the outer peripheral surface of the cylindrical portion 610. It is configured.
- An annular groove 621 is formed in the main body 620 of the torsional vibration damper 600.
- the side lip 523 is disposed in the annular groove 621. In this manner, a narrow and complicated path is formed from the atmosphere side to the sliding portion between the dust strip 522 and the outer peripheral surface of the cylindrical portion 610. Thereby, a labyrinth structure is provided.
- the inward flange portion 512 of the reinforcing ring 510 must be shortened.
- the side lip 523 configured as described above may not be employed. The reason will be described below.
- the oil seal 500 is obtained by molding the seal body 520 by insert molding using the reinforcing ring 510 as an insert part.
- the seal body 520 is molded with the reinforcing ring 510 positioned in the mold. Therefore, the seal body 520 is formed with an opening 524 that communicates with the end surface of the inward flange portion 512 of the reinforcing ring 510 that is opposite to the fluid to be sealed. That is, the opening 524 is formed in a portion corresponding to a positioning support (not shown) provided in the mold. Accordingly, a part of the end surface of the reinforcing ring 510 opposite to the fluid to be sealed in the inward flange portion 512 is exposed. This exposed portion is used when the oil seal 500 is attached.
- the oil seal 500 when the oil seal 500 is attached, the oil seal is pressed by a jig or the like.
- the seal ring 520 when the elastic seal body 520 is pressed, the seal ring 520 is damaged or broken, and the reinforcing ring 510 is pressed through the opening 524.
- the opening 524 is formed by the side lip 523. It will be hidden. Therefore, the reinforcing ring 510 cannot be pressed through the opening 524 with a jig or the like.
- the plurality of oil seals 500 are transported in a state of being stacked in the central axis direction.
- the side lip 523 is formed in the annular gap between the oil lip 521 and the cylindrical portion 511 of the reinforcing ring 510 in the adjacent oil seal 500. It will fit. Therefore, there is no problem in stacking the plurality of oil seals 500.
- the side lip 523 may be
- the oil seal 500 hits the vicinity of the tip of the cylindrical portion 511 of the reinforcing ring 510 in the adjacent oil seal 500. In this case, a plurality of oil seals 500 cannot be stacked.
- the annular groove 621 for providing the labyrinth structure in the main body 620 of the torsional vibration damper 600 it is necessary to sufficiently increase the thickness of the main body 620. For this reason, the weight of the main body 620 of the torsional vibration damper 600 is increased.
- the main body 620 is generally a casting, and the annular groove 621 must be processed by cutting, which hinders cost reduction.
- An object of the present invention is to provide a sealing structure that can provide a side lip even when the inward flange portion of a reinforcing ring is short and can provide a labyrinth structure between an oil seal and a torsional vibration damper. It is to provide.
- the present invention employs the following means in order to solve the above problems.
- the sealing structure of the present invention is A torsional vibration damper having a cylindrical portion attached to the crankshaft; An oil seal that seals an annular gap between an inner peripheral surface of a shaft hole through which the crankshaft in the housing is inserted and an outer peripheral surface of the cylindrical portion;
- the oil seal is A reinforcing ring having a cylindrical portion and an inward flange portion provided at an end of the cylindrical portion opposite to the fluid to be sealed side;
- An elastic seal body provided integrally with the reinforcing ring; With The reinforcing ring is configured such that a part of the end surface of the inward flange portion opposite to the fluid to be sealed is exposed.
- the seal body is An oil lip extending from the vicinity of the tip of the inward flange portion toward the fluid to be sealed and provided slidably with respect to the outer peripheral surface of the cylindrical portion; A dust lip that extends from the vicinity of the tip of the inward flange portion toward the side opposite to the fluid to be sealed, and is slidably provided on the outer peripheral surface of the tubular portion; A side lip extending from the vicinity of the front end of the inward flange portion to a position that does not reach the outer peripheral surface of the cylindrical portion toward the radially inner side and the side opposite to the fluid to be sealed from the dust strip,
- the cylindrical portion includes a small-diameter portion on which the dust lip slides, and a large-diameter portion on the opposite side of the small-diameter portion to the fluid to be sealed, On the outer peripheral surface of the large-diameter portion, a tapered surface is formed that is reduced in diameter toward the side opposite to the fluid to be sealed, and an annular gap is formed between the tape
- the side lip extends from the vicinity of the tip of the inward flange portion in the reinforcing ring toward the radially inner side and the side opposite to the fluid to be sealed with respect to the dust strip from the cylindrical portion of the torsional vibration damper. It is configured to extend to a position that does not reach the outer peripheral surface. Therefore, even if the inward flange portion of the reinforcing ring is short, the portion where the end face of the inward flange portion opposite to the fluid to be sealed is exposed is hidden by the side lip. Absent. Therefore, when the oil seal is attached, the inward flange portion can be directly pressed by a jig or the like. Further, even if a plurality of oil seals are stacked in the central axis direction, the side lip does not hit the vicinity of the tip of the cylindrical portion of the reinforcing ring in the adjacent oil seal.
- an annular gap is formed between the tapered surface formed on the outer peripheral surface of the large diameter portion provided in the cylindrical portion of the torsional vibration damper and the inner peripheral surface of the side lip.
- a narrow and complicated path can be formed from the side opposite to the fluid to be sealed to the sliding portion between the dust lip and the outer peripheral surface of the small diameter portion of the cylindrical portion. That is, a labyrinth structure can be provided.
- the side lip can be provided, and the labyrinth structure can be provided between the oil seal and the torsional vibration damper.
- the outer peripheral surface of the large-diameter portion provided in the cylindrical portion of the torsional vibration damper is formed with a tapered surface that decreases in diameter toward the side opposite to the fluid to be sealed.
- the inner peripheral surface of the side lip may be a tapered surface having a taper angle substantially equal to the taper angle of the taper surface formed in the large diameter portion.
- the annular gap between the outer peripheral surface of the large-diameter portion and the side lip in the cylindrical portion can be narrowly spaced and the distance from one end side to the other end side can be increased. Thereby, it can suppress further that muddy water etc. will reach the sliding part of a dust lip and the outer peripheral surface of the small diameter part of a cylindrical part.
- the side lip can be provided even if the inward flange portion of the reinforcing ring is short, and the labyrinth structure can be provided between the oil seal and the torsional vibration damper. it can.
- FIG. 1 is a schematic cross-sectional view of a sealing structure according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view of an oil seal according to an embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view of a sealing structure according to a conventional example.
- FIG. 1 is a schematic cross-sectional view of a sealing structure according to an embodiment of the present invention, which is a cross-sectional view cut along a plane including a central axis of a crankshaft.
- FIG. 2 is a schematic cross-sectional view of an oil seal according to an embodiment of the present invention, which is a cross-sectional view cut along a plane including the central axis of the oil seal having a substantially rotationally symmetric shape.
- the sealing structure according to the present embodiment includes an oil seal 100, a torsional vibration damper 200 attached to the crankshaft 300, and a front cover 400 as a housing.
- the torsional vibration damper 200 is an energy absorbing device attached to the crankshaft 300, and is provided to prevent excessive torsional vibration amplitude.
- the torsional vibration damper 200 is provided with a cylindrical tubular portion 210 attached to the crankshaft 300 on the inner peripheral surface side of the annular main body 220. Further, on the outer peripheral surface side of the main body 220, a metal annular mass 230 and an annular elastic body 240 made of an elastic body such as rubber that connects the main body 220 and the annular mass 230 are provided. .
- the function of suppressing the torsional vibration amplitude of the crankshaft 300 is exhibited by the annular mass body 230 and the annular elastic body 240.
- the oil seal 100 plays a role of sealing an annular gap between the inner peripheral surface of the shaft hole through which the crankshaft 300 is inserted in the front cover 400 and the outer peripheral surface of the cylindrical portion 210 in the torsional vibration damper 200. Yes. More specifically, the oil seal 100 suppresses the oil that is the fluid to be sealed from the fluid to be sealed side (O) from leaking to the atmosphere side (A) opposite to the fluid to be sealed side (O). At the same time, it plays a role of suppressing foreign matters such as dust and muddy water from entering the sealing target fluid side (O) from the atmosphere side (A).
- the oil seal 100 will be described in more detail with reference to FIGS. 1 and 2.
- the oil seal 100 includes a metal reinforcing ring 110 and a seal body 120 made of an elastic material such as rubber and provided integrally with the reinforcing ring 110.
- the oil seal 100 can be obtained by molding the seal body 120 by insert molding using the reinforcing ring 110 as an insert part.
- the reinforcing ring 110 includes a cylindrical portion 111 and an inward flange portion 112 provided at the end of the cylindrical portion 111 on the atmosphere side (A).
- the seal body 120 is in close contact with the oil lip 121 and the dust lip 122 that are slidable with respect to the outer peripheral surface of the cylindrical portion 210 of the torsional vibration damper 200 and the inner peripheral surface of the shaft hole of the front cover 400.
- the outer peripheral seal portion 123 and the side lip 124 are integrally provided.
- the oil lip 121 is configured to extend from the vicinity of the tip of the inward flange portion 112 in the reinforcing ring 110 to the inside in the radial direction and toward the fluid to be sealed (O).
- a plurality of screw grooves 121 a are provided on the inner peripheral surface side of the oil lip 121 to exhibit a pumping effect for returning leaked oil to the fluid to be sealed (O).
- a garter spring 130 is provided that applies a force toward the inner side in the radial direction so that the oil lip 121 does not move away from the outer peripheral surface of the cylindrical portion 210.
- the dust lip 122 is configured to extend from the vicinity of the tip of the inward flange portion 112 toward the inside in the radial direction and toward the atmosphere side (A).
- the side lip 124 is located at a position that does not reach the outer peripheral surface of the tubular portion 210 from the vicinity of the tip of the inward flange portion 112 radially inward and toward the atmosphere side (A) from the dust lip 122. It is configured to extend up to.
- the seal body 120 is provided with an opening 125.
- a plurality of openings 125 are provided at intervals in the circumferential direction. As described in the background art, the plurality of openings 125 are formed in portions corresponding to positioning support portions (not shown) provided in the mold during insert molding. A part of the end surface on the atmosphere side (A) in the inward flange portion 112 of the reinforcing ring 110 is exposed by these openings 125.
- the cylindrical portion 210 in the torsional vibration damper 200 includes a small-diameter portion 211 on the fluid to be sealed side (O) and a large-diameter portion 212 on the atmosphere side (A) with respect to the small-diameter portion 211. Is done.
- the oil lip 121 and the dust lip 122 in the oil seal 100 slide relative to the small diameter portion 211 in the cylindrical portion 210.
- the outer peripheral surface of the large diameter part 212 of the cylindrical part 210 is comprised by the taper surface 212a diameter-reduced toward the atmosphere side (A).
- An annular gap S is formed between the tapered surface 212 a and the inner peripheral surface of the side lip 124.
- the inner peripheral surface of the side lip 124 is also composed of a tapered surface 124a. It goes without saying that the annular gap S is formed even if the taper angle of the taper surface 124a in the side lip 124 and the taper angle of the taper surface 212a in the large diameter portion 212 of the cylindrical portion 210 are different. However, when both taper angles are different, the interval between the annular gaps S gradually increases from the sealing target fluid side (O) toward the atmosphere side (A) or is sealed from the atmosphere side (A). It gradually widens toward the target fluid side (O). Therefore, it becomes difficult to lengthen the distance from one end side to the other end side of the annular gap S while keeping a narrow interval.
- the inner peripheral surface of the side lip 124 is constituted by a tapered surface 124 a having a taper angle substantially equal to the taper angle of the tapered surface 212 a in the large diameter portion 212 of the cylindrical portion 210.
- both taper angles are substantially equal by designing so that both taper angles may become equal. This makes it possible to increase the distance from one end side to the other end side of the annular gap S at a narrow interval.
- the side lip 124 is torsionally vibrated from the vicinity of the tip of the inward flange portion 112 in the reinforcing ring 110 to the inside in the radial direction and toward the atmosphere side (A) from the dust lip 122. It is comprised so that it may extend to the position which does not reach the outer peripheral surface of the cylindrical part 210 in the damper 200. FIG. Therefore, even if the inward flange portion 112 in the reinforcing ring 110 is short, the opening 125 formed in the seal body 120 is not hidden by the side lip 124.
- the inward flange portion 112 can be directly pressed by a jig or the like. That is, the oil seal 100 is mounted in a shaft hole provided in the front cover 400 by being pressed by a jig or the like from the left side in FIG. In the present embodiment, the metal inward flange portion 112 is directly pressed by the jig or the like through the opening 125, so that the elastic seal body 120 may be damaged or damaged. Absent.
- a plurality of oil seals 100 can be stacked in the central axis direction.
- the annular gap S is formed between the outer peripheral surface (tapered surface 212a) of the large diameter portion 212 of the cylindrical portion 210 and the inner peripheral surface of the side lip 124. .
- a labyrinth structure is provided by the annular gap S. Therefore, according to the sealing structure according to the present embodiment, the side lip 124 can be provided even if the inward flange portion 112 of the reinforcing ring 110 is short, and the oil seal 100 and the torsional vibration damper 200 can be provided.
- a labyrinth structure can be provided. Thus, the labyrinth structure can be provided without providing an annular groove that is generally troublesome to process on the torsional vibration damper side.
- the thickness of the main body 220 can be reduced. Thereby, the weight of the main body 220 can be reduced.
- it is only necessary to provide a step in the cylindrical portion 210 that is, the cylindrical portion 210 is constituted by the small diameter portion 211 and the large diameter portion 212). Can be eliminated and the manufacturing cost can be reduced.
- the outer peripheral surface of the large-diameter portion 212 provided in the cylindrical portion 210 of the torsional vibration damper 200 is configured by a tapered surface 212a that decreases in diameter toward the atmosphere side (A).
- muddy water or the like can be prevented from entering the annular gap S between the outer peripheral surface of the large-diameter portion 212 and the side lip 124 in the cylindrical portion 210. That is, when muddy water or the like has fallen, it stays in the vicinity of the arrow X shown in FIG. 1 (near the boundary between the main body 220 and the large diameter portion 212). Fall down in the middle. Therefore, it is possible to suppress muddy water or the like from entering the annular gap S.
- the inner peripheral surface of the side lip 124 is constituted by a tapered surface 124 a having a taper angle substantially equal to the taper angle of the tapered surface 212 a in the large diameter portion 212 of the cylindrical portion 210.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
Description
クランク軸に取り付けられる筒状部を有するトーショナルバイブレーションダンパと、
ハウジングにおける前記クランク軸が挿通される軸孔の内周面と前記筒状部の外周面との間の環状隙間を密封するオイルシールと、
を備える密封構造において、
前記オイルシールは、
円筒部と、該円筒部における密封対象流体側とは反対側の端部に設けられる内向きフランジ部とを有する補強環と、
該補強環に一体的に設けられる弾性体製のシール本体と、
を備えると共に、
前記補強環は、前記内向きフランジ部における密封対象流体側とは反対側の端面の一部が露出されるように構成されており、
前記シール本体は、
前記内向きフランジ部の先端付近から密封対象流体側に向かって伸び、前記筒状部の外周面に対して摺動自在に設けられるオイルリップと、
前記内向きフランジ部の先端付近から密封対象流体側とは反対側に向かって伸び、前記筒状部の外周面に対して摺動自在に設けられるダストリップと、
前記内向きフランジ部の先端付近から径方向内側かつ前記ダストリップよりも密封対象流体側とは反対側に向かって、前記筒状部の外周面に届かない位置まで伸びるサイドリップと、
を備えると共に、
前記筒状部は、前記ダストリップが摺動する小径部と、該小径部よりも密封対象流体側とは反対側の大径部とを備えており、
大径部の外周面には、密封対象流体側とは反対側に向かって縮径するテーパ面が形成されており、該テーパ面と、前記サイドリップの内周面との間に環状隙間が形成されることを特徴とする。
図1及び図2を参照して、本発明の実施例に係る密封構造について説明する。図1は本発明の実施例に係る密封構造の模式的断面図であり、クランク軸の中心軸線を含む面で切断した断面図である。また、図1においては、トーショナルバイブレーションダンパについては簡略的に示している。図2は本発明の実施例に係るオイルシールの模式的断面図であり、略回転対称形状であるオイルシールの中心軸線を含む面で切断した断面図である。
特に図1を参照して、本実施例に係る密封構造全体の構成について説明する。本実施例に係る密封構造は、オイルシール100と、クランク軸300に取り付けられるトーショナルバイブレーションダンパ200と、ハウジングとしてのフロントカバー400とを備えている。
図1及び図2を参照して、オイルシール100について、より詳細に説明する。オイルシール100は、金属製の補強環110と、補強環110に一体的に設けられるゴムなどの弾性体製のシール本体120とを備えている。なお、補強環110をインサート部品として、インサート成形によってシール本体120を成形することにより、オイルシール100を得ることができる。
特に、図1を参照して、本実施例に係る密封構造に設けられるラビリンス構造について説明する。本実施例においては、トーショナルバイブレーションダンパ200における筒状部210は、密封対象流体側(O)の小径部211と、この小径部211よりも大気側(A)の大径部212とから構成される。オイルシール100におけるオイルリップ121及びダストリップ122は、筒状部210における小径部211に対して摺動する。また、筒状部210の大径部212の外周面は、大気側(A)に向かって縮径するテーパ面212aにより構成されている。そして、このテーパ面212aと、サイドリップ124の内周面との間に環状隙間Sが形成される。
本実施例に係る密封構造によれば、サイドリップ124は、補強環110における内向きフランジ部112の先端付近から径方向内側かつダストリップ122よりも大気側(A)に向かって、トーショナルバイブレーションダンパ200における筒状部210の外周面に届かない位置まで伸びるように構成されている。そのため、補強環110における内向きフランジ部112が短くても、シール本体120に形成されている開口部125がサイドリップ124によって隠されてしまうことはない。つまり、この内向きフランジ部112における大気側(A)の端面の一部が露出されている部分が、サイドリップ124によって隠されてしまうことはない。従って、オイルシール100を装着する際に、治具等により、内向きフランジ部112を直接押圧することができる。つまり、オイルシール100は、フロントカバー400に設けられた軸孔内に、図1中左側から治具などにより押圧されることにより装着される。本実施例においては、治具等により、開口部125を介して金属製の内向きフランジ部112が直接押圧されるため、弾性体製のシール本体120が傷ついたり破損したりしてしまうことがない。
110 補強環
111 円筒部
112 内向きフランジ部
120 シール本体
121 オイルリップ
121a ネジ溝
122 ダストリップ
123 外周シール部
124 サイドリップ
124a テーパ面
125 開口部
130 ガータスプリング
200 トーショナルバイブレーションダンパ
210 筒状部
211 小径部
212 大径部
212a テーパ面
220 本体部
230 環状質量体
240 環状弾性体
300 クランク軸
400 フロントカバー
S 環状隙間
Claims (2)
- クランク軸に取り付けられる筒状部を有するトーショナルバイブレーションダンパと、
ハウジングにおける前記クランク軸が挿通される軸孔の内周面と前記筒状部の外周面との間の環状隙間を密封するオイルシールと、
を備える密封構造において、
前記オイルシールは、
円筒部と、該円筒部における密封対象流体側とは反対側の端部に設けられる内向きフランジ部とを有する補強環と、
該補強環に一体的に設けられる弾性体製のシール本体と、
を備えると共に、
前記補強環は、前記内向きフランジ部における密封対象流体側とは反対側の端面の一部が露出されるように構成されており、
前記シール本体は、
前記内向きフランジ部の先端付近から密封対象流体側に向かって伸び、前記筒状部の外周面に対して摺動自在に設けられるオイルリップと、
前記内向きフランジ部の先端付近から密封対象流体側とは反対側に向かって伸び、前記筒状部の外周面に対して摺動自在に設けられるダストリップと、
前記内向きフランジ部の先端付近から径方向内側かつ前記ダストリップよりも密封対象流体側とは反対側に向かって、前記筒状部の外周面に届かない位置まで伸びるサイドリップと、
を備えると共に、
前記筒状部は、前記ダストリップが摺動する小径部と、該小径部よりも密封対象流体側とは反対側の大径部とを備えており、
大径部の外周面には、密封対象流体側とは反対側に向かって縮径するテーパ面が形成されており、該テーパ面と、前記サイドリップの内周面との間に環状隙間が形成されることを特徴とする密封構造。 - 前記サイドリップの内周面は、前記大径部に形成された前記テーパ面のテーパ角度とテーパ角度が略等しいテーパ面で構成されていることを特徴とする請求項1に記載の密封構造。
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EP15861979.1A EP3222891B1 (en) | 2014-11-18 | 2015-11-06 | Sealing structure |
US15/526,112 US9927031B2 (en) | 2014-11-18 | 2015-11-06 | Sealing structure |
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JP6890718B2 (ja) * | 2018-04-02 | 2021-06-18 | Nok株式会社 | 気流発生構造体および密封構造 |
JP2020041553A (ja) * | 2018-09-06 | 2020-03-19 | Nok株式会社 | 密封装置 |
CN110486473B (zh) * | 2019-08-06 | 2021-03-19 | 昆明学院 | 一种新型旋转轴唇形密封圈 |
US11994214B2 (en) * | 2019-08-30 | 2024-05-28 | Nok Corporation | Sealing device |
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EP3222891A4 (en) | 2018-08-01 |
EP3222891A1 (en) | 2017-09-27 |
KR101889241B1 (ko) | 2018-08-16 |
CN107002878B (zh) | 2018-10-02 |
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