WO2020255591A1 - 密封装置 - Google Patents
密封装置 Download PDFInfo
- Publication number
- WO2020255591A1 WO2020255591A1 PCT/JP2020/019133 JP2020019133W WO2020255591A1 WO 2020255591 A1 WO2020255591 A1 WO 2020255591A1 JP 2020019133 W JP2020019133 W JP 2020019133W WO 2020255591 A1 WO2020255591 A1 WO 2020255591A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sealing device
- lip
- sealed
- shaft
- auxiliary lip
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
Definitions
- the present invention relates to a sealing device that seals an annular gap between a relatively rotating shaft and howing.
- the oil seal (sealing device) used for the speed reducer or the like has a technique of providing an auxiliary lip in addition to the seal lip (main lip).
- auxiliary lip that slides with respect to the shaft on the fluid side to be sealed with respect to the main lip, it is possible to prevent foreign matter from entering the main lip side.
- the sliding wear of the main lip is suppressed by applying grease between the main lip and the auxiliary lip.
- the auxiliary lip suppresses not only foreign matter but also the fluid to be sealed (lubricating oil, etc.) from being sent to the main lip side. Therefore, sliding wear of the main lip may be promoted.
- An object of the present invention is to provide a sealing device capable of suppressing sliding wear of the main lip.
- the present invention has adopted the following means to solve the above problems.
- the sealing device of the present invention In a sealing device that seals an annular gap between a relatively rotating shaft and a housing A main lip that is slidable with respect to the shaft, An auxiliary lip provided on the fluid side to be sealed with respect to the main lip and slidable with respect to the shaft. It is a sealing device equipped with The inner peripheral surface of the auxiliary lip has an inclined surface whose diameter increases from the tip of the lip toward the side opposite to the fluid side to be sealed. The inclined surface is provided with protrusions that are slidable with respect to the shaft and that form gaps on both sides of the inclined surface that allow the region on the fluid side to be sealed and the region on the opposite side to communicate with each other in the circumferential direction.
- the sliding surfaces of these plurality of protrusions are parallel to the inclined surface when viewed in a cross section cut along the surface including the central axis of the sealing device in a state where no external force is applied to the auxiliary lip. It is characterized by being designed.
- the auxiliary lip can prevent foreign matter contained in the fluid to be sealed from invading the main lip side.
- the protrusions form a gap that communicates the region on the fluid side to be sealed and the region on the opposite side, so that the fluid to be sealed is sent to the main lip side.
- sliding wear of the main lip can be suppressed.
- the sliding surfaces of the plurality of protrusions form the inner peripheral surface of the auxiliary lip when viewed in a cross section cut along the surface including the central axis of the sealing device in a state where no external force is applied to the auxiliary lip. It is designed to be parallel to the slope. Therefore, in manufacturing, it is possible to suppress variations in the height of the protrusions with respect to the inclined surface.
- the first sealing device including the main lip and A second sealing device that is fitted and fixed to the inner peripheral surface of the first sealing device and has the auxiliary lip, It is good to have.
- main lip and the auxiliary lip are integrally provided.
- first sealing device including the main lip and A second sealing device that is fitted and fixed to the inner peripheral surface of the shaft hole of the housing and is provided with the auxiliary lip. It is also preferable to provide.
- FIG. 1 is a schematic cross-sectional view of the sealing device according to the first embodiment of the present invention.
- FIG. 2 is an explanatory diagram of the auxiliary lip according to the first embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view of the sealing device according to the second embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view of the sealing device according to the third embodiment of the present invention.
- FIG. 1 is a schematic cross-sectional view of the sealing device according to the first embodiment of the present invention.
- the sealing device according to this embodiment has a substantially rotationally symmetric shape
- FIG. 1 shows a cross-sectional view of the sealing device cut along a surface including the central axis of the sealing device.
- FIG. 1 shows a sealing device in a state where it is not subjected to an external force, and in the figure, the positions of the housing and the shaft when the sealing device is used are shown by dotted lines.
- FIG. 2 is an explanatory diagram of the auxiliary lip according to the first embodiment of the present invention.
- FIG. 2A is a cross-sectional view taken along the line AA in FIG. 1
- FIG. 2B is a cross-sectional view showing the state of the auxiliary lip when the shaft is inserted into the sealing device.
- the sealing device 10 according to the present embodiment can be suitably used for sealing an annular gap between a relatively rotating shaft 700 and a housing 800 in a speed reducer, a servomotor, or the like.
- the right side is a sealed region in which a fluid to be sealed such as oil (lubricating oil) is sealed
- the left side is a region opposite to the sealed region (here, an atmospheric region).
- the side that becomes the sealed region during use (the right side in FIG.
- the sealing device 10 is fixed to the inner peripheral surface of the shaft hole of the housing 800 by fitting. Then, when the shaft 700 and the housing 800 rotate relative to each other, the sealing device 10 is designed to maintain a stationary state with respect to the housing 800 and slide between the sealing device 10 and the shaft 700.
- the sealing device 10 has a first sealing device 100 fitted and fixed to the inner peripheral surface of the shaft hole of the housing 800 and a second sealing device 10 fitted and fixed to the inner peripheral surface of the first sealing device 100. It is composed of the device 200.
- the first sealing device 100 includes a reinforcing ring 110 and a seal main body 120 made of a rubber-like elastic body integrally provided with the reinforcing ring 110.
- the first sealing device 100 is obtained by molding the seal main body 120 by insert molding using the reinforcing ring 110 as an insert component.
- the reinforcing ring 110 is composed of a cylindrical portion 111 and an inward flange portion 112 provided at an end portion on the opposite side (A) of the cylindrical portion 111.
- the seal main body 120 includes an outer peripheral seal 121, a main lip 122, and a dust strip 123.
- the outer peripheral seal portion 121 is configured to be in close contact with the inner peripheral surface of the shaft hole of the housing 800.
- the sealing device 10 is fixed to the inner peripheral surface of the shaft hole of the housing 800 by fitting, and the fluid to be sealed leaks from the gap between the sealing device 10 and the inner peripheral surface of the shaft hole of the housing 800. Be prevented.
- Both the main lip 122 and the dust strip 123 are configured to be slidable with respect to the outer peripheral surface of the shaft 700.
- the main lip 122 mainly plays a role of preventing leakage of the fluid to be sealed.
- a garter spring 124 for pressing the radial inner tip of the main lip 122 against the shaft 700 is provided on the outer peripheral surface side of the main lip 122.
- the dust strip 123 mainly plays a role of preventing foreign matter (dust or the like) from the outside from entering the fluid side (O) to be sealed.
- the second sealing device 200 includes a reinforcing ring 210 and a seal main body 220 made of a rubber-like elastic body integrally provided with the reinforcing ring 210.
- the second sealing device 200 is obtained by molding the seal main body 220 by insert molding using the reinforcing ring 210 as an insert component.
- the reinforcing ring 210 is composed of a substantially cylindrical portion 211 and an inward flange portion 212 provided at the end of the substantially cylindrical portion 211 on the fluid side (O) to be sealed.
- the seal body 220 includes an auxiliary lip 221 that is slidable with respect to the shaft 700.
- the second sealing device 200 configured as described above is fixed to the inner peripheral surface of the first sealing device 100 by fitting.
- the substantially cylindrical portion 211 of the reinforcing ring 210 in the second sealing device 200 is fixed to the inner portion of the cylindrical portion 111 of the reinforcing ring 110 in the seal main body portion 120 in the first sealing device 100 by fitting.
- the auxiliary lip 221 in the second sealing device 200 is provided on the fluid side (O) to be sealed with respect to the main lip 122.
- the auxiliary lip 221 mainly plays a role of suppressing foreign matter such as metal powder contained in the fluid to be sealed from entering the main lip 122 side. By providing the auxiliary lip 221, it is possible to suppress the wear of the main lip 122 and extend the life of the main lip 122.
- grease is applied to the inner peripheral surfaces of both the main lip 122 and the auxiliary lip 221.
- the slidability between the main lip 122 and the shaft 700 and the slidability between the auxiliary lip 221 and the shaft 700 can be improved.
- the auxiliary lip 221 according to this embodiment will be described in more detail.
- the inner peripheral surface of the auxiliary lip 221 has an inclined surface 221a whose diameter increases from the tip of the lip toward the side (A) opposite to the fluid side (O) to be sealed.
- the inner peripheral surface of the auxiliary lip 221 according to the present embodiment is composed of the inclined surface 221a and an inclined surface whose diameter increases from the tip of the lip toward the fluid side (O) to be sealed.
- the faces intersect approximately vertically (the intersection corresponds to the tip of the lip).
- the inclined surface 221a is provided with a plurality of protrusions 222 slidably provided with respect to the shaft 700 at intervals in the circumferential direction.
- protrusions 222 play a role of forming gaps S on both sides (both sides in the circumferential direction) for communicating the region on the fluid side (O) to be sealed and the region on the opposite side (A) (FIG. FIG. 2 (b)).
- the portions other than the gaps S formed on both sides of the protrusion 222 are slidably in contact with the shaft 700.
- the sliding surfaces 222a of the plurality of protrusions 222 are the central axis of the sealing device 10 (in the case of this embodiment, the central axis of the second sealing device 200) in a state where no external force is applied to the auxiliary lip 221. It is designed to be parallel to the inclined surface 221a when viewed in a cross section cut by a surface including (which can be said to be).
- the inner peripheral surface of the protrusion 222 is composed of the sliding surface 222a and an inclined surface 222b that lowers the height of the protrusion 222 from the sliding surface 222a toward the root side of the auxiliary lip 221.
- the seal main body 220 of the second sealing device 200 is obtained by insert molding as described above. After the insert molding, the insert molded product is taken out from the mold, and then the tip side of the portion to be the auxiliary lip 221 is removed by cutting.
- the portion shown by the dotted line in FIG. 2A is a portion to be removed (removed portion 221X).
- the sliding surface 222a is designed to be parallel to the inclined surface 221a when viewed in a cross section cut along the surface including the central axis of the sealing device 10, the removal portion 221X is removed. Even if there are variations in the cutting position, the height of the protrusion 222 (the height from the inclined surface 221a to the sliding surface 222a) is constant. Therefore, it is possible to suppress the variation in the width of the gap S formed by the protrusion 222.
- the auxiliary lip 221 can prevent foreign matter contained in the fluid to be sealed from entering the main lip 122 side. Further, since the protrusion 222 forms a gap S that communicates the region on the fluid side (O) to be sealed and the region on the opposite side (A), the fluid to be sealed is sent to the main lip 122 side. As a result, even if the amount of grease applied is insufficient, sliding wear of the main lip can be suppressed.
- the sliding surfaces 222a of the plurality of protrusions 222 are inside the auxiliary lip 221 when viewed in a cross section cut along the surface including the central axis of the sealing device 10 in a state where no external force is applied to the auxiliary lip 221. It is designed to be parallel to the inclined surface 221a constituting the peripheral surface. Therefore, in manufacturing, it is possible to suppress the variation in the height of the protrusion 222 with respect to the inclined surface 221a. Therefore, it is possible to suppress the variation in the width of the gap S formed by the protrusion 222.
- the number, arrangement, and height of the protrusions 222 can be appropriately set according to the usage environment.
- two protrusions 222 are set as one set, and a plurality of sets are provided at intervals in the circumferential direction.
- a total of 8 protrusions 222 may be provided, one set for each 90 ° in the circumferential direction, or a total of 3 sets for a total of 6 protrusions 222 may be provided for each 120 ° in the circumferential direction. be able to.
- FIG. 3 shows Example 2 of the present invention.
- the configuration in which the auxiliary lip is provided in the second sealing device fitted and fixed to the inner peripheral surface of the first sealing device is shown.
- the configuration when the main lip and the auxiliary lip are provided integrally is shown.
- FIG. 3 is a schematic cross-sectional view of the sealing device according to the second embodiment of the present invention.
- the sealing device according to this embodiment has a substantially rotationally symmetric shape.
- FIG. 3 shows a cross-sectional view of the sealing device cut along a surface including the central axis of the sealing device. Further, FIG.
- FIG. 3 shows a sealing device in a state where it is not subjected to an external force, and in the figure, the positions of the housing and the shaft when the sealing device is used are shown by dotted lines. Since the sealing structure to which the sealing device 10X according to the present embodiment is applied is the same as that of the first embodiment, the description thereof will be omitted.
- the sealing device 10X includes a reinforcing ring 310 and a seal main body 320 made of a rubber-like elastic body integrally provided with the reinforcing ring 310.
- the sealing device 10X can be obtained by molding the seal main body 320 by insert molding using the reinforcing ring 310 as an insert component.
- the reinforcing ring 310 is composed of a cylindrical portion 311 and an inward flange portion 312 provided at an end portion of the cylindrical portion 311 on the side (A) opposite to the fluid side (O) to be sealed.
- the seal main body 320 includes an outer peripheral seal 321, a main lip 322, and a dust strip 323.
- the outer peripheral seal portion 321 is configured to be in close contact with the inner peripheral surface of the shaft hole of the housing 800.
- the sealing device 10X is fixed to the inner peripheral surface of the shaft hole of the housing 800 by fitting, and the fluid to be sealed leaks from the gap between the sealing device 10X and the inner peripheral surface of the shaft hole of the housing 800. Be prevented.
- Both the main lip 322 and the dust strip 323 are configured to be slidable with respect to the outer peripheral surface of the shaft 700.
- the main lip 322 mainly plays a role of preventing leakage of the fluid to be sealed.
- a garter spring 326 for pressing the radial inner tip of the main lip 322 against the shaft 700 is provided on the outer peripheral surface side of the main lip 322.
- the dust strip 323 mainly plays a role of preventing foreign matter (dust or the like) from the outside from entering the fluid side (O) to be sealed.
- the auxiliary lip 324 is provided on the fluid side (O) to be sealed with respect to the main lip 322, and the main lip 322 and the auxiliary lip 324 are integrally provided.
- the auxiliary lip 324 mainly plays a role of suppressing foreign matter such as metal powder contained in the fluid to be sealed from entering the main lip 322 side.
- grease is applied to the inner peripheral surfaces of both the main lip 322 and the auxiliary lip 324.
- the slidability between the main lip 322 and the shaft 700 and the slidability between the auxiliary lip 324 and the shaft 700 can be improved.
- auxiliary lip 324 a plurality of protrusions 325 slidably provided with respect to the shaft 700 are provided at intervals in the circumferential direction, as in the case of the first embodiment. ..
- the configuration, action, effect, manufacturing method, etc. of the auxiliary lip 324 and the protrusion 325 are the same as those of the auxiliary lip 221 and the protrusion 222 in the first embodiment, and thus the description thereof will be omitted.
- FIG. 4 shows Example 3 of the present invention.
- the first embodiment the case where the second sealing device provided with the auxiliary lip is fitted and fixed to the inner peripheral surface of the first sealing device is shown.
- this embodiment a configuration in which a second sealing device provided with an auxiliary lip is fitted and fixed to the inner peripheral surface of the shaft hole of the housing is shown.
- FIG. 4 is a schematic cross-sectional view of the sealing device according to the third embodiment of the present invention.
- the sealing device according to this embodiment has a substantially rotationally symmetric shape.
- FIG. 4 shows a cross-sectional view of the sealing device cut along a surface including the central axis of the sealing device. Further, FIG.
- FIG. 4 shows a sealing device in a state where it is not subjected to an external force, and in the figure, the positions of the housing and the shaft when the sealing device is used are shown by dotted lines. Since the sealing structure to which the sealing device 10Y according to the present embodiment is applied is the same as that of the first embodiment, the description thereof will be omitted.
- the sealing device 10Y has a first sealing device 400 fitted and fixed to the inner peripheral surface of the shaft hole of the housing 800 and a second sealing device 400 fitted and fixed to the inner peripheral surface of the shaft hole of the housing 800. It is composed of the device 500.
- the first sealing device 100 includes a reinforcing ring 410 and a seal main body 420 made of a rubber-like elastic body integrally provided with the reinforcing ring 410.
- the first sealing device 400 can be obtained by molding the seal main body 420 by insert molding using the reinforcing ring 410 as an insert component.
- the reinforcing ring 410 is composed of a cylindrical portion 411 and an inward flange portion 412 provided at an end portion of the cylindrical portion 411 on the side (A) opposite to the fluid side (O) to be sealed.
- the seal body portion 420 includes an outer peripheral seal portion 421, a main lip 422, and a dust strip 423.
- the configurations and roles of the outer peripheral seal portion 421, the main lip 422, and the dust strip 423 are the same as those of the outer peripheral seal portion 121, the main lip 122, and the dust strip 123 shown in the first embodiment. The description thereof will be omitted.
- the second sealing device 500 includes a reinforcing ring 510 and a seal main body portion 520 made of a rubber-like elastic body integrally provided on the reinforcing ring 510.
- the second sealing device 500 can be obtained by molding the seal main body portion 520 by insert molding using the reinforcing ring 510 as an insert component.
- the reinforcing ring 510 is composed of an annular member.
- the seal body 520 includes an auxiliary lip 521 that is slidable with respect to the shaft 700.
- the second sealing device 500 configured as described above is on the fluid side (O) to be sealed with respect to the first sealing device 100, and is adjacent to the first sealing device 100 on the inner peripheral surface of the shaft hole of the housing 800. Fitted and fixed to.
- the auxiliary lip 521 in the second sealing device 500 is provided on the fluid side (O) to be sealed with respect to the main lip 422.
- the auxiliary lip 521 mainly plays a role of suppressing foreign matter such as metal powder contained in the fluid to be sealed from entering the main lip 422 side.
- grease is applied to the inner peripheral surfaces of both the main lip 422 and the auxiliary lip 521.
- the slidability between the main lip 422 and the shaft 700 and the slidability between the auxiliary lip 521 and the shaft 700 can be improved.
- auxiliary lip 521 a plurality of protrusions 522 slidably provided with respect to the shaft 700 are provided at intervals in the circumferential direction, as in the case of the first embodiment. ..
- the configuration, action, effect, manufacturing method, etc. of the auxiliary lip 521 and the protrusion 522 are the same as those of the auxiliary lip 221 and the protrusion 222 in the first embodiment, and thus the description thereof will be omitted.
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- Engineering & Computer Science (AREA)
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- Sealing With Elastic Sealing Lips (AREA)
Abstract
Description
相対的に回転する軸とハウジングとの間の環状隙間を封止する密封装置において、
前記軸に対して摺動自在な主リップと、
前記主リップよりも密封対象流体側に設けられ、かつ前記軸に対して摺動自在な補助リップと、
を備える密封装置であって、
前記補助リップの内周面は、リップ先端から前記密封対象流体側とは反対側に向かって拡径する傾斜面を有すると共に、
前記傾斜面には、前記軸に対して摺動自在に設けられ、かつ、その両側に前記密封対象流体側の領域とその反対側の領域とを連通させる隙間をそれぞれ形成させる突起が周方向に間隔を空けて複数設けられており、
これら複数の突起の摺動面は、前記補助リップに外力が作用していない状態で、密封装置の中心軸線を含む面で切断した断面で見た場合に、前記傾斜面と平行になるように設計されていることを特徴とする。
第1密封装置の内周面に嵌合固定され、かつ前記補助リップを備える第2密封装置と、
を備えるとよい。
前記ハウジングの軸孔内周面に嵌合固定され、かつ前記補助リップを備える第2密封装置と、
を備えることも好適である。
図1及び図2を参照して、本発明の実施例1に係る密封装置について説明する。図1は本発明の実施例1に係る密封装置の模式的断面図である。本実施例に係る密封装置は略回転対称形状であり、図1においては、密封装置の中心軸線を含む面で密封装置を切断した断面図を示している。また、図1においては、外力を受けていない状態の密封装置を示しており、図中、密封装置の使用時におけるハウジングと軸の位置を点線で示している。図2は本発明の実施例1に係る補助リップの説明図である。図2(a)は図1中のAA断面図であり、図2(b)は密封装置に軸が挿入された状態における補助リップの様子を断面図にて示している。
本実施例に係る密封装置(オイルシール)を適用した密封構造について説明する。本実施例に係る密封装置10は、減速機やサーボモーターなどにおいて、相対的に回転する軸700とハウジング800との間の環状隙間を封止するために好適に用いることができる。図中、右側が油(潤滑油)などの密封対象流体が密封された密封領域であり、左側が密封領域とは反対側の領域(ここでは大気領域)である。以下、説明の便宜上、使用時において密封領域となる側(図1中、右側)を「密封対象流体側(O)」と称し、大気領域となる側(図1中、左側)を「反対側(A)」と称する。密封装置10は、ハウジング800の軸孔の内周面に嵌合によって固定される。そして、軸700とハウジング800が相対的に回転すると、密封装置10はハウジング800に対しては静止状態を維持し、密封装置10と軸700との間で摺動するように設計されている。
密封装置10について、より詳細に説明する。本実施例に係る密封装置10は、ハウジング800の軸孔の内周面に嵌合固定される第1密封装置100と、第1密封装置100の内周面に嵌合固定される第2密封装置200とから構成される。第1密封装置100は、補強環110と、補強環110に一体的に設けられるゴム状弾性体製のシール本体部120とを備えている。補強環110をインサート部品として、インサート成形によりシール本体部120を成形することで、第1密封装置100が得られる。補強環110は、円筒部111と、円筒部111における反対側(A)の端部に設けられる内向きフランジ部112とから構成される。シール本体部120は、外周シール部121と、主リップ122と、ダストリップ123とを備えている。外周シール部121は、ハウジング800の軸孔の内周面に密着するように構成されている。これにより、密封装置10がハウジング800の軸孔の内周面に嵌合により固定され、かつ密封装置10とハウジング800の軸孔の内周面との間の隙間からの密封対象流体の漏れが防止される。主リップ122とダストリップ123は、いずれも軸700の外周面に対して摺動自在に構成されている。主リップ122は、主として、密封対象流体の漏れを防止する役割を担っている。また、主リップ122の外周面側には、主リップ122の径方向内側の先端を軸700に押し付けるためのガータスプリング124が設けられている。ダストリップ123は、主として、外部からの異物(埃など)が密封対象流体側(O)に侵入してしまうことを防止する役割を担っている。
本実施例に係る補助リップ221について、より詳細に説明する。補助リップ221の内周面は、リップ先端から密封対象流体側(O)とは反対側(A)に向かって拡径する傾斜面221aを有している。なお、本実施例に係る補助リップ221の内周面は、当該傾斜面221aと、リップ先端から密封対象流体側(O)に向かって拡径する傾斜面とから構成されており、これらの傾斜面は略垂直に交わっている(交わりの部分がリップ先端に相当する)。そして、上記の傾斜面221aには、軸700に対して摺動自在に設けられる突起222が、周方向に間隔を空けて複数設けられている。これらの突起222は、その両側(周方向の両側)に密封対象流体側(O)の領域とその反対側(A)の領域とを連通させる隙間Sをそれぞれ形成させる役割を担っている(図2(b)参照)。なお、補助リップ221における傾斜面221aの先端付近においては、突起222の両側に形成される隙間S以外の部分は、軸700に摺動自在に接触している。
本実施例に係る密封装置10によれば、補助リップ221によって、密封対象流体中に含まれる異物が主リップ122側に侵入してしまうことを抑制することができる。また、突起222によって、密封対象流体側(O)の領域とその反対側(A)の領域とを連通させる隙間Sが形成されるため、密封対象流体は主リップ122側に送られる。これにより、グリースの塗布量が不十分であったとしても、主リップの摺動摩耗を抑制することができる。
図3には、本発明の実施例2が示されている。上記実施例1においては、第1密封装置の内周面に嵌合固定される第2密封装置に補助リップが備えられる場合の構成を示した。これに対して、本実施例においては、主リップと補助リップが一体に設けられる場合の構成を示す。図3は本発明の実施例2に係る密封装置の模式的断面図である。本実施例に係る密封装置は略回転対称形状である。図3においては、密封装置の中心軸線を含む面で密封装置を切断した断面図を示している。また、図3においては、外力を受けていない状態の密封装置を示しており、図中、密封装置の使用時におけるハウジングと軸の位置を点線で示している。本実施例に係る密封装置10Xが適用された密封構造については、上記実施例1と同様であるので、その説明は省略する。
図4には、本発明の実施例3が示されている。上記実施例1においては、第1密封装置の内周面に、補助リップを備える第2密封装置が嵌合固定される場合を示した。これに対して、本実施例においては、ハウジングの軸孔内周面に、補助リップを備える第2密封装置が嵌合固定される場合の構成を示す。図4は本発明の実施例3に係る密封装置の模式的断面図である。本実施例に係る密封装置は略回転対称形状である。図4おいては、密封装置の中心軸線を含む面で密封装置を切断した断面図を示している。また、図4おいては、外力を受けていない状態の密封装置を示しており、図中、密封装置の使用時におけるハウジングと軸の位置を点線で示している。本実施例に係る密封装置10Yが適用された密封構造については、上記実施例1と同様であるので、その説明は省略する。
110,310,410 補強環
111,311,411 円筒部
112,312,412 内向きフランジ部
120,320,420 シール本体部
121,321,421 外周シール部
122,322,422 主リップ
123,323,423 ダストリップ
124 ガータスプリング
210,510 補強環
211 略円筒部
212 内向きフランジ部
220,520 シール本体部
221,521 補助リップ
221X 除去部分
221a 傾斜面
222,522 突起
222a 摺動面
222b 傾斜面
324 補助リップ
325 突起
326 ガータスプリング
700 軸
800 ハウジング
S 隙間
Claims (4)
- 相対的に回転する軸とハウジングとの間の環状隙間を封止する密封装置において、
前記軸に対して摺動自在な主リップと、
前記主リップよりも密封対象流体側に設けられ、かつ前記軸に対して摺動自在な補助リップと、
を備える密封装置であって、
前記補助リップの内周面は、リップ先端から前記密封対象流体側とは反対側に向かって拡径する傾斜面を有すると共に、
前記傾斜面には、前記軸に対して摺動自在に設けられ、かつ、その両側に前記密封対象流体側の領域とその反対側の領域とを連通させる隙間をそれぞれ形成させる突起が周方向に間隔を空けて複数設けられており、
これら複数の突起の摺動面は、前記補助リップに外力が作用していない状態で、密封装置の中心軸線を含む面で切断した断面で見た場合に、前記傾斜面と平行になるように設計されていることを特徴とする密封装置。 - 前記主リップを備える第1密封装置と、
第1密封装置の内周面に嵌合固定され、かつ前記補助リップを備える第2密封装置と、
を備えることを特徴とする請求項1に記載の密封装置。 - 前記主リップと前記補助リップが一体に設けられていることを特徴とする請求項1に記載の密封装置。
- 前記主リップを備える第1密封装置と、
前記ハウジングの軸孔内周面に嵌合固定され、かつ前記補助リップを備える第2密封装置と、
を備えることを特徴とする請求項1に記載の密封装置。
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JP2009052705A (ja) | 2007-08-29 | 2009-03-12 | Nok Corp | オイルシール |
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CN1035786C (zh) * | 1994-05-18 | 1997-09-03 | 武汉成功密封件公司 | 双向抛射传递式旋转轴油封 |
JP3278349B2 (ja) * | 1995-05-25 | 2002-04-30 | エヌオーケー株式会社 | 密封装置 |
JP3404615B2 (ja) * | 1996-07-02 | 2003-05-12 | 光洋シーリングテクノ株式会社 | オイルシール |
JP2002206644A (ja) * | 2001-01-12 | 2002-07-26 | Nok Corp | 密封装置 |
JP4670210B2 (ja) * | 2001-09-14 | 2011-04-13 | Nok株式会社 | 密封装置 |
JP2004190844A (ja) * | 2002-12-13 | 2004-07-08 | Eagle Ind Co Ltd | シール装置 |
JP2005226746A (ja) * | 2004-02-13 | 2005-08-25 | Nok Corp | 密封装置 |
JP5985360B2 (ja) * | 2012-11-06 | 2016-09-06 | Nok株式会社 | 密封装置 |
WO2015053170A1 (ja) * | 2013-10-10 | 2015-04-16 | Nok株式会社 | 密封装置 |
CN204878742U (zh) * | 2015-08-20 | 2015-12-16 | 安徽江淮汽车股份有限公司 | 一种机油泵油封 |
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EP1239197A1 (en) * | 2001-03-09 | 2002-09-11 | Stefa S.r.l. | Method of producing a dynamic sealing ring |
JP2009052705A (ja) | 2007-08-29 | 2009-03-12 | Nok Corp | オイルシール |
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