WO2017183566A1 - 密封構造 - Google Patents
密封構造 Download PDFInfo
- Publication number
- WO2017183566A1 WO2017183566A1 PCT/JP2017/015228 JP2017015228W WO2017183566A1 WO 2017183566 A1 WO2017183566 A1 WO 2017183566A1 JP 2017015228 W JP2017015228 W JP 2017015228W WO 2017183566 A1 WO2017183566 A1 WO 2017183566A1
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- WO
- WIPO (PCT)
- Prior art keywords
- seal
- ring
- seal member
- hub
- sealing structure
- 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
- 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
- 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
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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
- F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
-
- 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
-
- 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
-
- 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
- F16C33/7879—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 further sealing ring
- F16C33/7883—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 further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3296—Arrangements for monitoring the condition or operation of elastic sealings; Arrangements for control of elastic sealings, e.g. of their geometry or stiffness
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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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
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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
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/02—Wheel hubs or castors
Definitions
- the present invention relates to a sealing structure in which a sealed space is formed in an annular gap between two members.
- a hub bearing of an automobile is hermetically sealed by two seal members provided on both sides (outside of the vehicle (outer side) and inside of the vehicle (inner side)) through a region where a plurality of rolling elements such as balls are provided. A space is formed.
- a rotary seal having a seal lip slidable on an inner ring or the like is employed as the two seal members.
- the use of a bore plug as an inner seal member has been studied.
- FIG. 5 is a schematic cross-sectional view of a hub bearing provided with a sealing structure according to a conventional example.
- the hub bearing 10 includes a hub 100, an inner ring 200 fixed to the hub 100, an outer ring 300 provided concentrically with the inner ring 200, between the hub 100 and the outer ring 300, and between the inner ring 200 and the outer ring 300.
- a plurality of balls B1 and B2 are provided.
- the outer ring 300 is attached to the vehicle body side, and the wheel is attached to the hub 100.
- the 1st seal member 400 is provided in the outer side through the field in which a plurality of balls B1 and B2 were provided, and the 2nd seal member 700 is provided in the inner side through the field.
- the first seal member 400 and the second seal member 700 form a sealed space (S).
- the second seal member 700 includes a metal lid main body 710 and an annular outer peripheral seal portion 720 made of a rubber-like elastic body provided on the outer peripheral surface of the lid main body 710. According to the second seal member 700, since there is no portion that slides with respect to the hub 100 and the inner ring 200, it is possible to prevent the generation of sliding torque by the second seal member 700. Further, by using the second seal member 700, the outer peripheral seal portion 720 can improve the sealing performance.
- the second seal member 700 is fixed to the outer ring 300 by fitting after the plurality of balls B1 and B2 and the first seal member 400 are assembled. As described above, since the second seal member 700 has high sealing performance, air in the sealed space (S) does not leak to the outside during the process of fitting the second seal member 700 to the outer ring 300, and the sealed space (S). The atmospheric pressure inside becomes high.
- the first seal member 400 is provided with a seal lip that extends toward the sealed space (S) and slidably adheres to the outer peripheral surface of the hub 100. .
- An object of the present invention is to provide a sealed structure capable of suppressing an increase in atmospheric pressure in a sealed space.
- the present invention employs the following means in order to solve the above problems.
- the sealing structure of the present invention is An outer member; An inner member that rotates relative to the outer member; A plurality of rolling elements provided between the outer member and the inner member so as to roll between the outer member and the inner member; A first seal member which is provided on one side through the region where the plurality of rolling elements are provided, and seals an annular gap between the outer member and the inner member; A second seal member that is provided on the other side through a region where the plurality of rolling elements are provided, and seals an annular gap between the outer member and the inner member; A sealed structure in which a sealed space is formed by the first seal member and the second seal member, The first seal member is provided with a first seal lip that extends toward the sealed space and slidably contacts the inner member. The second seal member is provided with a second seal lip that extends toward a side opposite to the sealed space and that slidably contacts the inner member.
- the second seal lip provided on the second seal member is configured to extend toward the side opposite to the sealed space and slidably contact the inner member. Therefore, when the atmospheric pressure in the sealed space increases, the second seal lip is deformed so as to be separated from the inner member, so that air can escape and the atmospheric pressure in the sealed space can be reduced.
- the second seal member is A metal ring having a cylindrical portion fitted to the inner peripheral surface of the outer member, and an inward flange portion provided at the other end of the cylindrical portion; A seal body made of a rubber-like elastic body provided integrally with the metal ring; With The seal body may include an outer peripheral seal portion that is in close contact with an inner peripheral surface of the outer member, and the second seal lip.
- the second seal member is provided with the outer peripheral seal portion made of a rubber-like elastic body, the sealing performance between the second seal member and the outer member can be improved.
- the outer member is an outer ring
- the inner member includes a hub and an inner ring fixed to the hub,
- the second seal lip is preferably in slidable contact with the tip surface of the inner ring.
- the outer member is an outer ring
- the inner member includes a hub, an inner ring fixed to the hub, and a rotating body fixed to the tip of the inner ring and having a smaller diameter than the outer diameter of the inner ring, It is also preferable that the second seal lip is slidably in contact with the outer peripheral surface of the rotating body.
- the diameter of the sliding portion by the second seal lip can be reduced, so that the sliding torque by the second seal member can be reduced.
- FIG. 1 is a schematic cross-sectional view of a hub bearing having a sealing structure according to Embodiment 1 of the present invention.
- FIG. 2 is a partially enlarged sectional view of the sealing structure according to the first embodiment of the present invention.
- FIG. 3 is a partially enlarged cross-sectional view of the sealing structure according to Embodiment 1 of the present invention.
- FIG. 4 is a partially enlarged sectional view of a sealing structure according to Embodiment 2 of the present invention.
- FIG. 5 is a schematic cross-sectional view of a hub bearing provided with a sealing structure according to a conventional example.
- FIG. 1 is a schematic cross-sectional view of a hub bearing having a sealing structure according to Embodiment 1 of the present invention.
- the structure of each part is shown simply.
- 2 is a partially enlarged sectional view of the sealing structure according to the first embodiment of the present invention, and corresponds to an enlarged sectional view of a circle C1 portion in FIG.
- 3 is a partially enlarged sectional view of the sealing structure according to the first embodiment of the present invention, and corresponds to an enlarged sectional view of a circle C2 portion in FIG.
- the hub bearing 10 includes a hub 100, an inner ring 200 fixed to the hub 100, and an outer ring 300 provided concentrically with the inner ring 200.
- the hub bearing 10 includes a plurality of balls B1 as rolling elements provided between the hub 100 and the outer ring 300 so as to roll between the hub 100 and the outer ring 300.
- the hub bearing 10 includes a plurality of balls B2 as rolling elements provided between the inner ring 200 and the outer ring 300 so as to roll between the inner ring 200 and the outer ring 300.
- the outer ring 300 corresponds to an outer member
- the hub 100 and the inner ring 200 correspond to an inner member that rotates with respect to the outer member.
- the outer ring 300 is attached to the vehicle body side, and the wheel is attached to the hub 100.
- the hub 100 is provided with a hole 110 through which a wheel is attached by a hub bolt.
- the 1st seal member 400 which seals the annular clearance between the outer ring
- a second seal member 600 that seals an annular gap between the outer ring 300 and the inner ring 200 is provided on the inner side (the other side) through an area where the plurality of balls B1 and B2 are provided.
- “Outer side” means the outside of the vehicle, and “inner side” means the inside of the vehicle.
- the sealed space (S) is formed by the first seal member 400 and the second seal member 600 that are provided on both sides via the region in which a plurality of balls B1 and B2 as rolling elements are provided. .
- the first seal member 400 includes a metal ring 410 and a rubber seal body 420 made of a rubber-like elastic body provided integrally with the metal ring 410.
- the metal ring 410 includes a cylindrical portion 411 that is fitted and fixed to the inner peripheral surface of the outer ring 300, and an inward flange portion 412 that is provided on the outer side of the cylindrical portion 411.
- the seal body 420 is provided with a first seal lip 421 that extends from the vicinity of the front end of the inward flange portion 412 toward the sealed space (S) and slidably contacts the outer peripheral surface of the hub 100. ing.
- the second seal member 600 includes a metal ring 610 and a seal body 620 made of a rubber-like elastic body provided integrally with the metal ring 610.
- the metal ring 610 includes a cylindrical portion 611 that is fitted to the inner peripheral surface of the outer ring 300, and an inward flange portion 612 that is provided at the inner end of the cylindrical portion 611.
- the seal body 620 includes an outer peripheral seal 621 that is in close contact with the inner peripheral surface of the outer ring 300 and a second seal lip 622.
- the second seal lip 622 extends toward the opposite side of the sealed space (S) and is configured to slidably contact the tip surface of the inner ring 200. With the above configuration, when the inner ring 200 is rotating with respect to the outer ring 300, the second seal lip 622 is kept in sliding contact with the front end surface of the inner ring 200, thereby exhibiting sealing performance. .
- the annular member 500 is attached to the inner ring 200.
- the annular member 500 includes a metal ring 510 and a magnetic encoder 520 provided integrally with the metal ring 510.
- the metal ring 510 includes a cylindrical portion 511 that is fixed to the inner ring 200 by fitting, and an outward flange portion 512 that is provided at the inner end of the cylindrical portion 511.
- the outward flange portion 512 is provided to face the inward flange portion 612 of the metal ring 610 in the second seal member 600.
- the magnetic encoder 520 is provided so as to cover the inner side surface of the outward flange portion 512.
- the magnetic encoder 520 is a known technique and will not be described in detail.
- the magnetic encoder 520 is configured by a rubber magnet or the like, and has S poles and N poles alternately provided in the circumferential direction. Accordingly, it is possible to detect the rotational speed of the inner ring 200 by providing a rotational speed detection sensor (not shown) having a function of detecting a change in the magnetic field.
- a complicated and complicated space is formed between the annular member 500 and the second seal member 600, and a so-called labyrinth seal portion L is formed. .
- the second seal lip 622 provided on the second seal member 600 extends toward the side opposite to the sealed space (S) and slidably contacts the inner ring 200. It is the structure to do. Therefore, when the atmospheric pressure in the sealed space (S) is increased, the second seal lip 622 is deformed so as to be separated from the inner ring 200, so that air can escape and the atmospheric pressure in the sealed space (S) can be reduced. Therefore, the first seal lip 421 of the seal body 420 in the first seal member 400 can be prevented from being strongly pressed against the outer peripheral surface of the hub 100 by the atmospheric pressure in the sealed space (S). . Thereby, the increase in the sliding torque by the 1st seal member 400 can be suppressed, and it can suppress that the sliding wear of the 1st seal lip 421 is promoted.
- the second seal lip 622 is configured to slidably contact the tip surface of the inner ring 200. Therefore, since the diameter of the sliding part by the 2nd seal lip 622 can be made small, the sliding torque by the 2nd seal member 600 can be reduced.
- the second seal member 600 is provided with the outer peripheral seal portion 621 made of a rubber-like elastic body, so that the sealing performance between the second seal member 600 and the outer ring 300 is improved. be able to. Furthermore, in this embodiment, since the labyrinth seal portion L is formed between the annular member 500 and the second seal member 600, the entry of foreign matter from the second seal member 600 side into the sealed space (S) side. Can be further suppressed.
- FIG. 4 shows a second embodiment of the present invention.
- wheel was shown.
- a configuration is shown in which the second seal lip of the second seal member is slidably in contact with the outer peripheral surface of the rotating body fixed to the tip of the inner ring. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
- FIG. 4 is a partially enlarged cross-sectional view of a sealing structure according to Example 2 of the present invention.
- FIG. 4 corresponds to an enlarged cross-sectional view of a circle C2 portion in FIG.
- the present embodiment is different from FIG. 1 in that the rotating body is fixed to the tip of the inner ring 200.
- a rotating body 210 having a smaller diameter than the outer diameter of the inner ring 200 is fixed to the tip of the inner ring 200.
- the rotating body 210 is configured to rotate with the inner ring 200.
- a specific example of the rotating body 210 is a constant velocity joint.
- the first seal member 400 and the annular member 500 are as described in the first embodiment, and thus the description thereof is omitted.
- the outer ring 300 corresponds to an outer member
- the hub 100, the inner ring 200, and the rotating body 210 correspond to an inner member that rotates with respect to the outer member.
- the point that the rotating body 210 is provided at the tip of the inner ring 200 and the configuration of the second seal member 600 are the second seal member 600 shown in the first embodiment. Only the point different from the configuration is different from the first embodiment.
- the second seal member 600 also includes a metal ring 610 and a seal body 620a made of a rubber-like elastic body provided integrally with the metal ring 610.
- the metal ring 610 includes a cylindrical portion 611 that is fitted to the inner peripheral surface of the outer ring 300, and an inward flange portion 612 that is provided at the inner end of the cylindrical portion 611.
- the seal body 620a includes an outer peripheral seal 621 that is in close contact with the inner peripheral surface of the outer ring 300, and a second seal lip 622a.
- the second seal lip 622a extends toward the opposite side of the sealed space (S) and is configured to slidably contact the outer peripheral surface of the rotating body 210.
- the same effect as in the first embodiment can be obtained.
- a more complicated space is formed between the annular member 500 and the second seal member 600 as compared with the case of the first embodiment.
- the labyrinth seal portion L formed in this way it is possible to further suppress the entry of foreign matter from the second seal member 600 side to the sealed space (S) side.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
Abstract
Description
アウター部材と、
前記アウター部材に対して回転するインナー部材と、
前記アウター部材とインナー部材との間に、これらアウター部材とインナー部材との間で転動するように設けられる複数の転動体と、
前記複数の転動体が設けられた領域を介して一方側に設けられ、前記アウター部材とインナー部材との間の環状隙間を封止する第1シール部材と、
前記複数の転動体が設けられた領域を介して他方側に設けられ、前記アウター部材とインナー部材との間の環状隙間を封止する第2シール部材と、
を備え、第1シール部材と第2シール部材とによって密閉空間が形成される密封構造であって、
第1シール部材には、前記密閉空間側に向かって伸び、かつ前記インナー部材に対して摺動自在に接触する第1シールリップが設けられ、
第2シール部材には、前記密閉空間とは反対側に向かって伸び、かつ前記インナー部材に対して摺動自在に接触する第2シールリップが設けられていることを特徴とする。
前記アウター部材の内周面に嵌められる円筒部と、該円筒部における前記他方側の端部に設けられる内向きフランジ部と、を有する金属環と、
前記金属環に一体的に設けられるゴム状弾性体製のシール本体部と、
を備え、
前記シール本体部は、前記アウター部材の内周面に密着する外周シール部と、前記第2シールリップとを有するとよい。
前記環状部材と第2シール部材との間でラビリンスシール部が形成されるとよい。
前記インナー部材は、ハブと、該ハブに固定される内輪とを備え、
第2シールリップは、前記内輪の先端面に対して摺動自在に接触するとよい。
前記インナー部材は、ハブと、該ハブに固定される内輪と、該内輪の先端に固定され、かつ該内輪の外径よりも小径の回転体とを備え、
第2シールリップは、前記回転体の外周表面に対して摺動自在に接触することも好適である。
図1~図3を参照して、本発明の実施例1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1に係る密封構造を備えるハブベアリングの模式的断面図である。なお、図1においては、各部の構成を簡略的に示している。図2は本発明の実施例1に係る密封構造の一部拡大断面図であり、図1中の円C1部分の拡大断面図に相当する。図3は本発明の実施例1に係る密封構造の一部拡大断面図であり、図1中の円C2部分の拡大断面図に相当する。
図1を参照して、本実施例に係る密封構造を備えるハブベアリングの全体構成について説明する。
特に、図2を参照して、第1シール部材400について、より詳細に説明する。第1シール部材400は、金属環410と、金属環410に対して一体的に設けられるゴム状弾性体製のシール本体部420とから構成される。金属環410は、外輪300の内周面に対して嵌合固定される円筒部411と、円筒部411のアウター側に設けられる内向きフランジ部412とから構成される。シール本体部420は、内向きフランジ部412の先端付近から、密閉空間(S)側に向かって伸び、かつハブ100の外周表面に対して摺動自在に接触する第1シールリップ421が設けられている。以上の構成により、外輪300に対してハブ100が回転している際においては、ハブ100の外周表面に対して第1シールリップ421が摺動接触した状態を保つことで密封性が発揮される。
特に、図3を参照して、第2シール部材600について、より詳細に説明する。第2シール部材600は、金属環610と、金属環610に一体的に設けられるゴム状弾性体製のシール本体部620とから構成される。金属環610は、外輪300の内周面に嵌められる円筒部611と、この円筒部611におけるインナー側の端部に設けられる内向きフランジ部612とを有する。そして、シール本体部620は、外輪300の内周面に密着する外周シール部621と、第2シールリップ622とを有する。この第2シールリップ622は、密閉空間(S)とは反対側に向かって伸び、かつ内輪200の先端面に対して摺動自在に接触するように構成されている。以上の構成により、外輪300に対して内輪200が回転している際においては、内輪200の先端面に対して第2シールリップ622が摺動接触した状態を保つことで密封性が発揮される。
本実施例に係る密封構造によれば、第2シール部材600に設けられる第2シールリップ622は、密閉空間(S)とは反対側に向かって伸び、内輪200に対して摺動自在に接触する構成である。従って、密閉空間(S)内の気圧が高くなると、第2シールリップ622は内輪200から離れるように変形することによって、空気を逃がし、密閉空間(S)内の気圧を低減させることができる。従って、第1シール部材400におけるシール本体部420の第1シールリップ421が、密閉空間(S)内の気圧によって、ハブ100の外周表面に対して強く押し付けられてしまうことを抑制することができる。これにより、第1シール部材400による摺動トルクの増加を抑制することができ、第1シールリップ421の摺動摩耗が促進されてしまうことを抑制することができる。
図4には、本発明の実施例2が示されている。上記実施例においては、第2シール部材における第2シールリップが、内輪の先端面に対して摺動自在に接触す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、第2シール部材における第2シールリップが、内輪の先端に固定された回転体の外周表面に対して摺動自在に接触する場合の構成を示す。その他の構成および作用については実施例1と同一なので、同一の構成部分については同一の符号を付して、その説明は省略する。
100 ハブ
110 孔
200 内輪
210 回転体
300 外輪
400 第1シール部材
410 金属環
411 円筒部
412 内向きフランジ部
420 シール本体部
421 第1シールリップ
500 環状部材
510 金属環
511 円筒部
512 外向きフランジ部
520 磁気エンコーダ
600 第2シール部材
610 金属環
611 円筒部
612 内向きフランジ部
620,620a シール本体部
621 外周シール部
622,622a 第2シールリップ
B1,B2 ボール
L ラビリンスシール部
Claims (5)
- アウター部材と、
前記アウター部材に対して回転するインナー部材と、
前記アウター部材とインナー部材との間に、これらアウター部材とインナー部材との間で転動するように設けられる複数の転動体と、
前記複数の転動体が設けられた領域を介して一方側に設けられ、前記アウター部材とインナー部材との間の環状隙間を封止する第1シール部材と、
前記複数の転動体が設けられた領域を介して他方側に設けられ、前記アウター部材とインナー部材との間の環状隙間を封止する第2シール部材と、
を備え、第1シール部材と第2シール部材とによって密閉空間が形成される密封構造であって、
第1シール部材には、前記密閉空間側に向かって伸び、かつ前記インナー部材に対して摺動自在に接触する第1シールリップが設けられ、
第2シール部材には、前記密閉空間とは反対側に向かって伸び、かつ前記インナー部材に対して摺動自在に接触する第2シールリップが設けられていることを特徴とする密封構造。 - 第2シール部材は、
前記アウター部材の内周面に嵌められる円筒部と、該円筒部における前記他方側の端部に設けられる内向きフランジ部と、を有する金属環と、
前記金属環に一体的に設けられるゴム状弾性体製のシール本体部と、
を備え、
前記シール本体部は、前記アウター部材の内周面に密着する外周シール部と、前記第2シールリップとを有することを特徴とする請求項1に記載の密封構造。 - 前記内向きフランジ部に対向するように設けられる外向きフランジ部を有する環状部材を備え、
前記環状部材と第2シール部材との間でラビリンスシール部が形成されることを特徴とする請求項2に記載の密封構造。 - 前記アウター部材は外輪であり、
前記インナー部材は、ハブと、該ハブに固定される内輪とを備え、
第2シールリップは、前記内輪の先端面に対して摺動自在に接触することを特徴とする請求項1,2または3に記載の密封構造。 - 前記アウター部材は外輪であり、
前記インナー部材は、ハブと、該ハブに固定される内輪と、該内輪の先端に固定され、かつ該内輪の外径よりも小径の回転体とを備え、
第2シールリップは、前記回転体の外周表面に対して摺動自在に接触することを特徴とする請求項1,2または3に記載の密封構造。
Priority Applications (4)
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US16/093,602 US20190120295A1 (en) | 2016-04-20 | 2017-04-14 | Sealing structure |
JP2018513151A JPWO2017183566A1 (ja) | 2016-04-20 | 2017-04-14 | 密封構造 |
CN201780023442.XA CN109072980A (zh) | 2016-04-20 | 2017-04-14 | 密封构造 |
EP17785904.8A EP3447320A1 (en) | 2016-04-20 | 2017-04-14 | Sealing structure |
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JP2016084609 | 2016-04-20 | ||
JP2016-084609 | 2016-04-20 |
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EP (1) | EP3447320A1 (ja) |
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US11796004B2 (en) * | 2019-06-12 | 2023-10-24 | Nok Corporation | Sealing device |
JP7090810B2 (ja) | 2019-07-24 | 2022-06-24 | Nok株式会社 | 密封装置 |
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CN109072980A (zh) | 2018-12-21 |
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