JP2020176673A - Seal structure and seal - Google Patents

Seal structure and seal Download PDF

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Publication number
JP2020176673A
JP2020176673A JP2019078611A JP2019078611A JP2020176673A JP 2020176673 A JP2020176673 A JP 2020176673A JP 2019078611 A JP2019078611 A JP 2019078611A JP 2019078611 A JP2019078611 A JP 2019078611A JP 2020176673 A JP2020176673 A JP 2020176673A
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Prior art keywords
case
seal
axial direction
lip
shaft member
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JP2019078611A
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JP7530705B2 (en
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薫 四十
Kaoru YOTO
薫 四十
佑介 片岡
Yusuke Kataoka
佑介 片岡
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Nabtesco Corp
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Nabtesco Corp
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Priority to JP2019078611A priority Critical patent/JP7530705B2/en
Priority to CN202010176130.6A priority patent/CN111828639A/en
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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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)

Abstract

To provide a seal structure which can seal an interior properly with a simple structure, and to provide a seal.SOLUTION: A seal structure of a rotary machine includes: a case 2; a shaft member 3; and a seal member 10. The shaft member 3 is disposed within the case 2. The seal member 10 seals a gap between the case 2 and the shaft member 3. The case 2 includes an inner periphery part 2a which contacts with an outer periphery part 11a of the seal member 10. The inner periphery part 2a of the case 2 includes an inner diameter change part 41 in which a length of a diameter increases from the outer side to the inner side in an axial direction D.SELECTED DRAWING: Figure 2

Description

本発明は、シール構造及びシールに関する。 The present invention relates to a seal structure and a seal.

従来から、ロボットに搭載される減速機の稼働環境は、ロボットの動作の高速化及び高頻度化に伴って厳しくなっている。例えば、高速動作又は高温下の動作では、減速機の温度が上昇するとともに、減速機内部の圧力が所望の圧力よりも増大する場合がある。減速機の内部圧力の増大に伴い、オイルシールが減速機から抜け落ちるおそれがある。
また、潤滑剤又は外部からの溶剤によって、オイルシールのゴム材に硬化などの化学変化が生じ、外径の縮小などの変形が生じる場合がある。オイルシールの変形に伴い、オイルシールが減速機から抜け落ちるおそれがある。
これらの問題に対して、例えばオイルシールの外径を大きく形成することによって、オイルシールの装着部に対する押し付け力を増大させるだけでは、オイルシールが減速機から抜け落ちることを的確に抑制することは困難である。従来、オイルシールの抜け落ちを防ぐための抜け止め用の部材を備える密封装置が知られている（例えば、特許文献１参照）。 Conventionally, the operating environment of the speed reducer mounted on the robot has become stricter as the operation speed and frequency of the robot operation have increased. For example, in high-speed operation or operation under high temperature, the temperature of the speed reducer may rise and the pressure inside the speed reducer may increase more than a desired pressure. As the internal pressure of the reducer increases, the oil seal may come off from the reducer.
In addition, the lubricant or an external solvent may cause a chemical change such as hardening of the rubber material of the oil seal, resulting in deformation such as reduction of the outer diameter. The oil seal may come off from the reducer due to the deformation of the oil seal.
To solve these problems, for example, it is difficult to accurately prevent the oil seal from coming off the reducer simply by increasing the pressing force against the mounting portion of the oil seal by forming a large outer diameter of the oil seal. Is. Conventionally, a sealing device including a member for preventing the oil seal from coming off is known (see, for example, Patent Document 1).

特開２０１６−１０９１９０号公報Japanese Unexamined Patent Publication No. 2016-109190

ところで、上記したような密封装置は、抜け止め用の部材を着脱可能に固定する固定部材を備える。これにより、密封装置の構成に要する特別な部材、例えば抜け止め用の部材、固定部材及び固定部材が装着される部材などを必要とし、装置構成が複雑になる可能性があった。 By the way, the sealing device as described above includes a fixing member for detachably fixing the retaining member. As a result, a special member required for the configuration of the sealing device, for example, a member for preventing retaining, a fixing member, a member on which the fixing member is mounted, and the like are required, and the device configuration may be complicated.

本発明は、簡易な構成によって内部を適正にシールすることができるシール構造及びシールを提供する。 The present invention provides a seal structure and a seal capable of properly sealing the inside with a simple structure.

本発明の一態様に係るシール構造は、ケースと、軸部材と、シール部材と、を備える。ケースは、軸方向の外方側から内方側に向かうことに伴って径の長さが増大する内周部を有する。軸部材は、ケースの内部に配置される。シール部材は、ケースと軸部材との間をシールする。 The seal structure according to one aspect of the present invention includes a case, a shaft member, and a seal member. The case has an inner peripheral portion whose diameter length increases as it goes from the outer side to the inner side in the axial direction. The shaft member is arranged inside the case. The sealing member seals between the case and the shaft member.

このように構成することで、シール部材に接触するケースの内周部は、軸方向の外方側から内方側に向かうことに伴って径の長さが増大する。これにより、ケースの内周部の法線反力は、軸方向の外方側から内方側に向かって傾いて径方向内方に作用する。例えばケースの内周部の法線反力が径方向に平行である場合に比べて、シール部材を軸方向の内方に向かって押すことによって、シール部材が軸方向の外方に抜け外れることを抑制することができる。 With this configuration, the inner peripheral portion of the case that comes into contact with the seal member increases in diameter as it goes from the outer side to the inner side in the axial direction. As a result, the normal reaction force of the inner peripheral portion of the case tilts from the outer side in the axial direction toward the inward side and acts inward in the radial direction. For example, as compared with the case where the normal reaction force of the inner peripheral portion of the case is parallel in the radial direction, the sealing member is pulled out in the axial direction by pushing the sealing member inward in the axial direction. Can be suppressed.

本発明の一態様に係るシール構造は、ケースと、軸部材と、シール部材と、を備える。軸部材は、ケースの内部に配置される。シール部材は、軸方向の外方側から内方側に向かうことに伴って径の長さが増大する外周部を有する。シール部材は、ケースと軸部材との間をシールする。 The seal structure according to one aspect of the present invention includes a case, a shaft member, and a seal member. The shaft member is arranged inside the case. The sealing member has an outer peripheral portion whose diameter length increases from the outer side to the inner side in the axial direction. The sealing member seals between the case and the shaft member.

このように構成することで、ケースの内周部に接触するシール部材の外周部は、軸方向の外方側から内方側に向かうことに伴って径の長さが増大する。これにより、ケースの内周部の法線反力は、軸方向の外方側よりも内方側でより大きくなる。シール部材を軸方向の内方側でより強く保持することによって、シール部材が軸方向の外方に抜け外れることを抑制することができる。 With this configuration, the outer peripheral portion of the seal member in contact with the inner peripheral portion of the case increases in diameter as it goes from the outer side to the inner side in the axial direction. As a result, the normal reaction force of the inner peripheral portion of the case becomes larger on the inner side than on the outer side in the axial direction. By holding the seal member more strongly on the inner side in the axial direction, it is possible to prevent the seal member from coming off outward in the axial direction.

本発明の一態様に係るシール構造は、ケースと、軸部材と、シール部材と、連結部と、を備える。軸部材は、ケースの内部に配置される。シール部材は、ケースと軸部材との間をシールする。連結部は、ケースに接触するシール部材の外周部と軸部材に接触するシール部材の内周部とを連結する。連結部は、軸方向の内方に向かって凸状に湾曲する。 The seal structure according to one aspect of the present invention includes a case, a shaft member, a seal member, and a connecting portion. The shaft member is arranged inside the case. The sealing member seals between the case and the shaft member. The connecting portion connects the outer peripheral portion of the seal member that contacts the case and the inner peripheral portion of the seal member that contacts the shaft member. The connecting portion is curved inward in the axial direction in a convex shape.

このように構成することで、軸方向内方に向かって凸状に湾曲する連結部には軸方向内方からの内圧によって追加的にシール部材の外周部をケースの内周面に押し付ける力が作用する。例えば連結部が湾曲していない場合に比べて、シール部材をケースに向かってより強く押すことによって、シール部材が軸方向の外方に抜け外れることを抑制することができる。 With this configuration, a force that additionally presses the outer peripheral portion of the seal member against the inner peripheral surface of the case is applied to the connecting portion that is curved inward in the axial direction by the internal pressure from the inward in the axial direction. It works. For example, by pushing the seal member more strongly toward the case as compared with the case where the connecting portion is not curved, it is possible to prevent the seal member from coming off in the axial direction.

上記構成であって、連結部は、外周側で軸方向の内方に向かって凸状に湾曲する湾曲部を備えることが好ましい。 In the above configuration, it is preferable that the connecting portion includes a curved portion that is convexly curved inward in the axial direction on the outer peripheral side.

このように構成することで、湾曲部には軸方向内方からの内圧によって追加的に外周部をケースの内周面に押し付ける力が作用する。例えば湾曲部を備えない場合に比べて、シール部材をケースに向かってより強く押すことによって、シール部材が軸方向の外方に抜け外れることを抑制することができる。また、例えば内周側に湾曲部を備える場合に比べて、軸部材とシール部材との抵抗を抑制することができる。 With this configuration, a force that additionally presses the outer peripheral portion against the inner peripheral surface of the case acts on the curved portion due to the internal pressure from the inner side in the axial direction. For example, by pushing the seal member more strongly toward the case as compared with the case where the curved portion is not provided, it is possible to prevent the seal member from coming off outward in the axial direction. Further, the resistance between the shaft member and the seal member can be suppressed as compared with the case where the curved portion is provided on the inner peripheral side, for example.

本発明の一態様に係るシール構造は、ケースと、軸部材と、シール部材と、を備える。軸部材は、ケースの内部に配置される。シール部材は、ケースと軸部材との間をシールする。シール部材は、ケースよりも熱膨張係数が大きい。 The seal structure according to one aspect of the present invention includes a case, a shaft member, and a seal member. The shaft member is arranged inside the case. The sealing member seals between the case and the shaft member. The sealing member has a larger coefficient of thermal expansion than the case.

このように構成することで、シール部材は、温度上昇時にケースよりも膨張しやすい。例えばシール部材及びケースの熱膨張係数がほぼ同一である場合又はシール部材の熱膨張係数がケースの熱膨張係数よりも小さい場合に比べて、シール部材がケースによってより強く保持されることによって、シール部材が軸方向の外方に抜け外れることを抑制することができる。 With this configuration, the seal member is more likely to expand than the case when the temperature rises. For example, the seal member is held more strongly by the case than when the coefficient of thermal expansion of the seal member and the case are substantially the same or when the coefficient of thermal expansion of the seal member is smaller than the coefficient of thermal expansion of the case. It is possible to prevent the member from coming off in the axial direction.

本発明の一態様に係るシールは、リップ部と、ベース部と、連結部と、を備える。リップ部は、ケースの内周に配置された部材に接触する。ベース部は、ケースに固定される。連結部は、ベース部とリップ部とを接続する。ベース部に作用するケースの力が軸方向の内方側よりも外方側で大きくされている。 The seal according to one aspect of the present invention includes a lip portion, a base portion, and a connecting portion. The lip portion comes into contact with a member arranged on the inner circumference of the case. The base portion is fixed to the case. The connecting portion connects the base portion and the lip portion. The force of the case acting on the base is larger on the outer side than on the inner side in the axial direction.

このように構成することで、例えばベース部に作用するケースの力が軸方向の内方側よりも外方側で小さくされる場合に比べて、シールを軸方向の内方側でより強く保持することによって、シールが軸方向の外方に抜け外れることを抑制することができる。 With this configuration, for example, the seal is held more strongly on the inner side in the axial direction than when the force acting on the base portion is made smaller on the outer side than on the inner side in the axial direction. By doing so, it is possible to prevent the seal from coming off in the axial direction.

本発明の一態様に係るシールは、リップ部と、ベース部と、連結部と、増大手段と、を備える。リップ部は、ケースの内周に配置された部材に接触する。ベース部は、ケースに固定される。連結部は、ベース部とリップ部とを接続する。増大手段は、ケース内の圧力の増大に伴い前記リップ部が前記ケースを押す力を増大させる。 The seal according to one aspect of the present invention includes a lip portion, a base portion, a connecting portion, and an increasing means. The lip portion comes into contact with a member arranged on the inner circumference of the case. The base portion is fixed to the case. The connecting portion connects the base portion and the lip portion. The increasing means increases the force with which the lip portion pushes the case as the pressure in the case increases.

このように構成することで、ケース内の圧力の増大に伴い、リップ部がケースをより強く押すことによって、シールが軸方向の外方に抜け外れることを抑制することができる。 With this configuration, it is possible to prevent the seal from coming off in the axial direction due to the lip portion pushing the case more strongly as the pressure inside the case increases.

本発明の一態様に係るシールは、リップ部と、ベース部と、連結部と、増大手段と、を備える。リップ部は、ケースの内周に配置された部材に接触する。ベース部は、ケースに固定される。連結部は、ベース部とリップ部とを接続する。増大手段は、ケース内の温度上昇に伴い前記リップ部が前記ケースを押す力を増大させる。 The seal according to one aspect of the present invention includes a lip portion, a base portion, a connecting portion, and an increasing means. The lip portion comes into contact with a member arranged on the inner circumference of the case. The base portion is fixed to the case. The connecting portion connects the base portion and the lip portion. The increasing means increases the force with which the lip portion pushes the case as the temperature inside the case rises.

このように構成することで、ケース内の温度上昇に伴い、リップ部がケースをより強く押すことによって、シールが軸方向の外方に抜け外れることを抑制することができる。 With this configuration, it is possible to prevent the seal from coming off outward in the axial direction by pushing the case more strongly with the lip portion as the temperature inside the case rises.

上記構成であって、増大手段は前記連結部に形成されていることが好ましい。 With the above configuration, it is preferable that the increasing means is formed at the connecting portion.

このように構成することで、ベース部には追加的に連結部がケースを押す力が作用する。例えば増大手段が連結部に形成されていない場合に比べて、シールをケースに向かってより強く押すことによって、シールが軸方向の外方に抜け外れることを抑制することができる。 With this configuration, an additional force is applied to the base portion by the connecting portion to push the case. For example, by pushing the seal more strongly toward the case as compared with the case where the increasing means is not formed in the connecting portion, it is possible to prevent the seal from coming off in the axial direction.

上記構成であって、増大手段は軸方向の内方に向かって凸状に湾曲する湾曲部を備えることが好ましい。 In the above configuration, it is preferable that the increasing means includes a curved portion that is convexly curved inward in the axial direction.

このように構成することで、湾曲部には軸方向内方からの内圧によって追加的にベース部をケースに押し付ける力が作用する。例えば湾曲部を備えない場合に比べて、シールをケースに向かってより強く押すことによって、シールが軸方向の外方に抜け外れることを抑制することができる。 With this configuration, a force that additionally presses the base portion against the case acts on the curved portion due to the internal pressure from the inside in the axial direction. For example, by pushing the seal more strongly toward the case as compared with the case where the curved portion is not provided, it is possible to prevent the seal from coming off in the axial direction.

上記構成であって、増大手段は、ケースよりも熱膨張係数が大きい素材であって、リップ部、ベース部及び連結部のうちの少なくとも一部を形成する。 In the above configuration, the increasing means is a material having a coefficient of thermal expansion larger than that of the case, and forms at least a part of a lip portion, a base portion, and a connecting portion.

このように構成することで、リップ部、ベース部及び連結部のうちの少なくとも一部は、温度上昇時にケースよりも膨張しやすい。例えばリップ部、ベース部及び連結部とケースとの熱膨張係数がほぼ同一である場合又はリップ部、ベース部及び連結部の熱膨張係数がケースの熱膨張係数よりも小さい場合に比べて、シールがケースによってより強く保持されることによって、シールが軸方向の外方に抜け外れることを抑制することができる。 With this configuration, at least a part of the lip portion, the base portion and the connecting portion is more likely to expand than the case when the temperature rises. For example, the seal is compared with the case where the coefficient of thermal expansion of the lip portion, the base portion and the connecting portion is almost the same as that of the case, or the coefficient of thermal expansion of the lip portion, the base portion and the connecting portion is smaller than the coefficient of thermal expansion of the case. By being held more strongly by the case, it is possible to prevent the seal from coming off in the axial direction.

本発明によれば、簡易な構成によって内部を適正にシールすることが可能となる。 According to the present invention, it is possible to properly seal the inside with a simple structure.

本発明の第１実施形態に係るシール構造を備える回転機械の構成を示す断面図。The cross-sectional view which shows the structure of the rotary machine provided with the seal structure which concerns on 1st Embodiment of this invention. 図１に示すシール部材の拡大断面図。An enlarged cross-sectional view of the seal member shown in FIG. 本発明の第１実施形態の変形例に係るシール部材の断面図。FIG. 3 is a cross-sectional view of a seal member according to a modified example of the first embodiment of the present invention. 本発明の第２実施形態に係るシール部材の断面図。Sectional drawing of the seal member which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係るシール部材の断面図。FIG. 3 is a cross-sectional view of a seal member according to a third embodiment of the present invention.

（第１実施形態）
以下、本発明の回転機械のシール構造の第１実施形態について添付図面を参照しながら説明する。
図１は、第１実施形態に係るシール構造を備える回転機械１の構成を示す断面図である。図２は、図１に示すシール部材１０の拡大断面図である。 (First Embodiment)
Hereinafter, the first embodiment of the seal structure of the rotary machine of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing a configuration of a rotary machine 1 having a seal structure according to the first embodiment. FIG. 2 is an enlarged cross-sectional view of the seal member 10 shown in FIG.

図１及び図２に示すように、本実施形態の回転機械１は、ケース２と、軸部材３と、２つの軸受４と、シール部材１０とを備える。
ケース２の外形は、例えば円筒状に形成されている。
軸部材３の外形は、例えば円筒状に形成されている。軸部材３は、ケース２の内部に配置されている。軸部材３の中心軸Ｏは、ケース２の中心軸と同軸である。軸部材３は、中心軸Ｏの軸周りにケース２に対して相対回転する。
２つの軸受４は、回転機械１の軸方向Ｄの第１端部１ａ側及び第２端部１ｂ側の各々でケース２と軸部材３との間に配置されている。２つの軸受４は、ケース２に対して中心軸Ｏの軸周りに回転可能に軸部材３を支持する。なお、軸方向Ｄは、軸部材３の中心軸Ｏに平行な方向である。 As shown in FIGS. 1 and 2, the rotary machine 1 of the present embodiment includes a case 2, a shaft member 3, two bearings 4, and a seal member 10.
The outer shape of the case 2 is formed, for example, in a cylindrical shape.
The outer shape of the shaft member 3 is formed, for example, in a cylindrical shape. The shaft member 3 is arranged inside the case 2. The central axis O of the shaft member 3 is coaxial with the central axis of the case 2. The shaft member 3 rotates relative to the case 2 around the axis of the central axis O.
The two bearings 4 are arranged between the case 2 and the shaft member 3 on the first end 1a side and the second end 1b side of the rotary machine 1 in the axial direction D, respectively. The two bearings 4 rotatably support the shaft member 3 around the central shaft O with respect to the case 2. The axial direction D is a direction parallel to the central axis O of the shaft member 3.

各軸受４は、例えば、アウターレース５と、インナーレース６と、複数の玉７とを備える。
アウターレース５の外形は、例えば円環状に形成されている。アウターレース５は、ケース２の内側に嵌め込まれ、ケース２の内周面２Ａに接している。
インナーレース６の外形は、例えば円環状に形成されている。インナーレース６は、軸部材３の外側に嵌め込まれ、軸部材３の外周面３Ｂに接している。
複数の玉７の各々の外形は、例えば球形状に形成されている。複数の玉７は、アウターレース５とインナーレース６との間に配置されている。複数の玉７は、周方向に所定間隔を置いて全周に亘って配置されている。各玉７は、アウターレース５とインナーレース６との間で転動する。 Each bearing 4 includes, for example, an outer race 5, an inner race 6, and a plurality of balls 7.
The outer shape of the outer race 5 is formed in an annular shape, for example. The outer race 5 is fitted inside the case 2 and is in contact with the inner peripheral surface 2A of the case 2.
The outer shape of the inner race 6 is formed in an annular shape, for example. The inner race 6 is fitted on the outside of the shaft member 3 and is in contact with the outer peripheral surface 3B of the shaft member 3.
The outer shape of each of the plurality of balls 7 is formed in, for example, a spherical shape. The plurality of balls 7 are arranged between the outer race 5 and the inner race 6. The plurality of balls 7 are arranged over the entire circumference at predetermined intervals in the circumferential direction. Each ball 7 rolls between the outer race 5 and the inner race 6.

シール部材１０の外形は、例えば円環状に形成されている。シール部材１０は、回転機械１の軸方向Ｄの第１端部１ａ側で軸受４よりも外方側に配置されている。シール部材１０は、ケース２と軸部材３との間に形成される環状空間をシールする。
シール部材１０は、例えば、ベース部１１と、リップ部１２とを備える。
ベース部１１の外形は、例えば軸方向Ｄ及び径方向Ｒに沿う断面がＬ字状に屈曲する円環状に形成されている。ベース部１１は、芯部２１と、芯部２１を被覆する被覆部２２とを備える。芯部２１は、例えば金属などの弾性材料によって形成されている。被覆部２２は、例えばゴム又は樹脂などの弾性材料によって形成されている。 The outer shape of the seal member 10 is formed in an annular shape, for example. The seal member 10 is arranged on the first end portion 1a side of the rotary machine 1 in the axial direction D and on the outer side of the bearing 4. The sealing member 10 seals an annular space formed between the case 2 and the shaft member 3.
The seal member 10 includes, for example, a base portion 11 and a lip portion 12.
The outer shape of the base portion 11 is formed in an annular shape in which a cross section along the axial direction D and the radial direction R is bent in an L shape, for example. The base portion 11 includes a core portion 21 and a covering portion 22 that covers the core portion 21. The core portion 21 is formed of an elastic material such as metal. The covering portion 22 is formed of an elastic material such as rubber or resin.

ベース部１１は、ケース２の内周面２Ａに接する外周部１１ａと、外周部１１ａとリップ部１２とを連結する連結部１１ｂとを備える。外周部１１ａ及び連結部１１ｂは、一体に形成されている。
外周部１１ａの外形は、軸方向Ｄに沿って延びる円環状に形成されている。
連結部１１ｂの外形は、外周部１１ａの軸方向外方側の端部１１ｃから径方向内方に延びる円環状に形成されている。 The base portion 11 includes an outer peripheral portion 11a in contact with the inner peripheral surface 2A of the case 2, and a connecting portion 11b connecting the outer peripheral portion 11a and the lip portion 12. The outer peripheral portion 11a and the connecting portion 11b are integrally formed.
The outer shape of the outer peripheral portion 11a is formed in an annular shape extending along the axial direction D.
The outer shape of the connecting portion 11b is formed in an annular shape extending inward in the radial direction from the end portion 11c on the outer side in the axial direction of the outer peripheral portion 11a.

ベース部１１は、例えばベース部１１の外周部１１ａが径方向内方に向かって弾性的に変形した状態でケース２の内周面２Ａに嵌め込まれることによって、シール部材１０をケース２に保持させる。外周部１１ａは、径方向内方に向かって弾性的に変形することによって、弾性力によってケース２の内周面２Ａに押し付けられる。 The base portion 11 is fitted into the inner peripheral surface 2A of the case 2 in a state where the outer peripheral portion 11a of the base portion 11 is elastically deformed inward in the radial direction, whereby the seal member 10 is held by the case 2. .. The outer peripheral portion 11a is elastically deformed inward in the radial direction and is pressed against the inner peripheral surface 2A of the case 2 by an elastic force.

リップ部１２の外形は、例えば連結部１１ｂの端部１１ｄから径方向内方に突出する円環状に形成されている。リップ部１２は、例えばゴム又は樹脂などの弾性材料によって形成されている。リップ部１２は、例えば連結部１１ｂと一体に形成されている。
リップ部１２は、ダストリップ３１と、接触リップ３２と、スプリングリング３３とを備える。
ダストリップ３１の外形は、例えば連結部１１ｂの端部１１ｄから軸方向外方側に傾くように径方向内方に突出する円環状に形成されている。ダストリップ３１の先端３１ａは軸部材３の外周面３Ｂに押し付けられるようにして接している。ダストリップ３１は、回転機械１の外部で浮遊する異物が回転機械１の内部空間（ケース２と軸部材３とによって囲まれた空間）に侵入することを抑制する。 The outer shape of the lip portion 12 is formed in an annular shape that protrudes inward in the radial direction from the end portion 11d of the connecting portion 11b, for example. The lip portion 12 is formed of an elastic material such as rubber or resin. The lip portion 12 is integrally formed with, for example, the connecting portion 11b.
The lip portion 12 includes a dust strip 31, a contact lip 32, and a spring ring 33.
The outer shape of the dust strip 31 is formed in an annular shape that protrudes inward in the radial direction so as to be inclined outward in the axial direction from the end portion 11d of the connecting portion 11b, for example. The tip 31a of the dust strip 31 is in contact with the outer peripheral surface 3B of the shaft member 3 so as to be pressed against it. The dust strip 31 prevents foreign matter floating outside the rotating machine 1 from entering the internal space of the rotating machine 1 (the space surrounded by the case 2 and the shaft member 3).

接触リップ３２の外形は、例えば連結部１１ｂの端部１１ｄから軸方向内方側に傾くように径方向内方に突出する円環状に形成されている。接触リップ３２の先端３２ａは軸部材３の外周面３Ｂに押し付けられるようにして接している。
スプリングリング３３は、接触リップ３２の外周面３２Ａ上に形成された環状凹部３２ｂに嵌め込まれている。スプリングリング３３は、いわゆるガーターばね（ガータースプリング）であって、例えばコイルばねの両端が連結されることによって形成された円環状のばね等である。スプリングリング３３は、弾性材料により形成されている。スプリングリング３３は、接触リップ３２に装着された状態で弾性的に伸びている。スプリングリング３３は、弾性力によって接触リップ３２の先端を径方向に軸部材３の外周面３Ｂに押し付け、接触リップ３２を圧縮変形させる。
接触リップ３２は、回転機械１の外部からダストリップ３１を通じて内部空間に液体状の異物が流入すること、及び、回転機械１の内部空間から外部へと液体状の潤滑剤が流出することを抑制する。 The outer shape of the contact lip 32 is formed in an annular shape that projects inward in the radial direction so as to be inclined inward in the axial direction from the end portion 11d of the connecting portion 11b, for example. The tip 32a of the contact lip 32 is in contact with the outer peripheral surface 3B of the shaft member 3 so as to be pressed against it.
The spring ring 33 is fitted in an annular recess 32b formed on the outer peripheral surface 32A of the contact lip 32. The spring ring 33 is a so-called garter spring (garter spring), and is, for example, an annular spring formed by connecting both ends of a coil spring. The spring ring 33 is made of an elastic material. The spring ring 33 is elastically extended while being attached to the contact lip 32. The spring ring 33 presses the tip of the contact lip 32 radially against the outer peripheral surface 3B of the shaft member 3 by an elastic force to compress and deform the contact lip 32.
The contact lip 32 suppresses the inflow of liquid foreign matter from the outside of the rotary machine 1 into the internal space through the dust strip 31 and the outflow of the liquid lubricant from the internal space of the rotary machine 1 to the outside. To do.

シール部材１０はベース部１１を介してケース２に固定される。リップ部１２のダストリップ３１及び接触リップ３２は、ケース２及び軸部材３の少なくともいずれかの相対回転時に軸部材３の外周面３Ｂに接触した状態で相対回転する。 The seal member 10 is fixed to the case 2 via the base portion 11. The dust strip 31 and the contact lip 32 of the lip portion 12 rotate relative to each other in contact with the outer peripheral surface 3B of the shaft member 3 during the relative rotation of at least one of the case 2 and the shaft member 3.

シール部材１０に接するケース２の内周部２ａは、軸方向Ｄの外方側から内方側に向かうことに伴って内径の長さが増大傾向に変化する内径変化部４１を備える。内径変化部４１の内周面４１Ａは、例えば軸方向Ｄに対して所定角度θだけ傾斜するテーパ状に形成されている。
内径変化部４１の内周面４１Ａの法線方向は、径方向Ｒに対して所定角度θだけ傾いている。これにより、シール部材１０の外周部１１ａからケース２の内周部２ａに作用する力に対するケース２の内径変化部４１の法線反力ＲＦは、軸方向Ｄの外方側から内方側に向かって傾いて径方向内方に作用する。 The inner peripheral portion 2a of the case 2 in contact with the seal member 10 includes an inner diameter changing portion 41 whose inner diameter length changes in an increasing tendency from the outer side to the inner side in the axial direction D. The inner peripheral surface 41A of the inner diameter changing portion 41 is formed in a tapered shape that is inclined by, for example, a predetermined angle θ with respect to the axial direction D.
The normal direction of the inner peripheral surface 41A of the inner diameter changing portion 41 is tilted by a predetermined angle θ with respect to the radial direction R. As a result, the normal reaction force RF of the inner diameter changing portion 41 of the case 2 with respect to the force acting from the outer peripheral portion 11a of the sealing member 10 to the inner peripheral portion 2a of the case 2 is changed from the outer side to the inner side in the axial direction D. It tilts toward and acts inward in the radial direction.

上述したように、第１実施形態の回転機械１のシール構造では、ケース２の内径変化部４１の内周面４１Ａは、軸方向Ｄに対して所定角度θだけ傾斜するテーパ状に形成されている。これにより、ケース２の内径変化部４１の法線反力ＲＦは、軸方向Ｄの外方側から内方側に向かって傾いて径方向内方に作用する。例えばケース２の内周部２ａの法線反力が径方向に平行である場合に比べて、シール部材１０を軸方向Ｄの内方に向かって押すことによって、シール部材１０が軸方向Ｄの外方に抜け外れることを抑制することができる。 As described above, in the seal structure of the rotary machine 1 of the first embodiment, the inner peripheral surface 41A of the inner diameter changing portion 41 of the case 2 is formed in a tapered shape inclined by a predetermined angle θ with respect to the axial direction D. There is. As a result, the normal reaction force RF of the inner diameter changing portion 41 of the case 2 tilts from the outer side to the inward side in the axial direction D and acts in the radial direction. For example, as compared with the case where the normal reaction force of the inner peripheral portion 2a of the case 2 is parallel in the radial direction, by pushing the seal member 10 inward in the axial direction D, the seal member 10 is moved in the axial direction D. It is possible to prevent it from coming off to the outside.

なお、上述した第１実施形態では、ベース部１１は外周部１１ａのみによって構成され、シール部材１０は、ベース部１１（外周部１１ａ）と、連結部１１ｂと、リップ部１２とによって構成されてもよい。この場合、ベース部１１（外周部１１ａ）はケース２に固定され、連結部１１ｂはベース部１１（外周部１１ａ）とリップ部１２とを接続する。
また、上述した第１実施形態では、リップ部１２は軸部材３に接するとしたが、これに限定されず、ケース２の内周に配置された他の部材に接してもよい。 In the first embodiment described above, the base portion 11 is composed of only the outer peripheral portion 11a, and the seal member 10 is composed of the base portion 11 (outer peripheral portion 11a), the connecting portion 11b, and the lip portion 12. May be good. In this case, the base portion 11 (outer peripheral portion 11a) is fixed to the case 2, and the connecting portion 11b connects the base portion 11 (outer peripheral portion 11a) and the lip portion 12.
Further, in the first embodiment described above, the lip portion 12 is in contact with the shaft member 3, but the present invention is not limited to this, and the lip portion 12 may be in contact with another member arranged on the inner circumference of the case 2.

（第１実施形態の変形例）
以下、第１実施形態の変形例について説明する。なお、上述した第１実施形態と同様の構成については、同一の符号を付して説明を省略又は簡略化する。
図３は、第１実施形態の変形例に係るシール部材１０の断面図である。
上述した実施形態では、シール部材１０に接するケース２の内周部２ａは内径変化部４１を備えるとしたが、これに限定されず、シール部材１０の外周部１１ａは外径変化部４２を備えてもよい。 (Modified example of the first embodiment)
Hereinafter, a modified example of the first embodiment will be described. The same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted or simplified.
FIG. 3 is a cross-sectional view of the seal member 10 according to the modified example of the first embodiment.
In the above-described embodiment, the inner peripheral portion 2a of the case 2 in contact with the seal member 10 includes an inner diameter changing portion 41, but the present invention is not limited to this, and the outer peripheral portion 11a of the sealing member 10 includes an outer diameter changing portion 42. You may.

図３に示すように、第１実施形態の変形例では、シール部材１０に接するケース２の内周部２ａの内周面２Ａは軸方向Ｄに平行である。
シール部材１０の外周部１１ａは、ケース２に装着されるより前の自然状態で軸方向Ｄの外方側から内方側に向かうことに伴って外径の長さが増大傾向に変化する外径変化部４２を備える。外径変化部４２の外周面４２Ｂ（例えば、図３に示す破線による外周面４２Ｂ）は、ケース２に装着されるより前の自然状態では、例えば軸方向Ｄに対して所定角度θだけ傾斜するテーパ状に形成されている。
シール部材１０の外周部１１ａがケース２に装着された状態で、外周部１１ａがケース２の内周面２Ａに押し付けられる力は、軸方向Ｄの外方側よりも内方側でより大きくなる。これにより、シール部材１０の外周部１１ａからケース２の内周部２ａに作用する力に対するケース２の内周部２ａの法線反力ＲＦは、軸方向Ｄの外方側よりも内方側でより大きくなる。 As shown in FIG. 3, in the modified example of the first embodiment, the inner peripheral surface 2A of the inner peripheral portion 2a of the case 2 in contact with the seal member 10 is parallel to the axial direction D.
The outer diameter of the outer peripheral portion 11a of the seal member 10 changes in an increasing tendency as the outer diameter of the outer peripheral portion 11a moves from the outer side to the inner side in the axial direction D in a natural state before being mounted on the case 2. A diameter changing portion 42 is provided. The outer peripheral surface 42B of the outer diameter changing portion 42 (for example, the outer peripheral surface 42B according to the broken line shown in FIG. 3) is inclined by a predetermined angle θ with respect to the axial direction D in the natural state before being mounted on the case 2. It is formed in a tapered shape.
With the outer peripheral portion 11a of the seal member 10 mounted on the case 2, the force with which the outer peripheral portion 11a is pressed against the inner peripheral surface 2A of the case 2 becomes larger on the inner side than on the outer side in the axial direction D. .. As a result, the normal reaction force RF of the inner peripheral portion 2a of the case 2 with respect to the force acting from the outer peripheral portion 11a of the sealing member 10 to the inner peripheral portion 2a of the case 2 is on the inner side of the outer side in the axial direction D. Will be bigger.

上述したように、第１実施形態の変形例に係る回転機械１のシール構造では、シール部材１０の外径変化部４２の外周面４２Ａは、ケース２に装着されるより前の自然状態で軸方向Ｄに対して所定角度θだけ傾斜するテーパ状に形成されている。これにより、シール部材１０の外周部１１ａからケース２の内周部２ａに作用する力に対するケース２の内周部２ａの法線反力ＲＦは、軸方向Ｄの外方側よりも内方側でより大きくなる。例えばケース２の内周部２ａの法線反力ＲＦが軸方向Ｄの外方側及び内方側でほぼ同じ大きさである場合に比べて、シール部材１０を軸方向Ｄの内方側でより強く保持することによって、シール部材１０が軸方向Ｄの外方に抜け外れることを抑制することができる。 As described above, in the sealing structure of the rotating machine 1 according to the modified example of the first embodiment, the outer peripheral surface 42A of the outer diameter changing portion 42 of the sealing member 10 is a shaft in a natural state before being mounted on the case 2. It is formed in a tapered shape that is inclined by a predetermined angle θ with respect to the direction D. As a result, the normal reaction force RF of the inner peripheral portion 2a of the case 2 with respect to the force acting from the outer peripheral portion 11a of the sealing member 10 to the inner peripheral portion 2a of the case 2 is on the inner side of the outer side in the axial direction D. Will be bigger. For example, the sealing member 10 is placed on the inner side of the axial direction D as compared with the case where the normal reaction force RF of the inner peripheral portion 2a of the case 2 is substantially the same on the outer side and the inner side of the axial direction D. By holding the seal member 10 more strongly, it is possible to prevent the seal member 10 from coming off outward in the axial direction D.

また、上述した第１実施形態の変形例では、上述したシール部材１０の外径変化部４２に限定されず、他の構成によってベース部１１に作用するケース２の力が軸方向Ｄの内方側よりも外方側で大きくされてもよい。
これにより、例えばベース部１１に作用するケース２の力が軸方向Ｄの内方側よりも外方側で小さくされる場合に比べて、シール部材１０を軸方向Ｄの内方側でより強く保持することによって、シール部材１０が軸方向Ｄの外方に抜け外れることを抑制することができる。 Further, in the modification of the first embodiment described above, the force of the case 2 acting on the base portion 11 by another configuration is not limited to the outer diameter changing portion 42 of the seal member 10 described above, and is inside the axial direction D. It may be made larger on the outer side than on the side.
As a result, for example, the sealing member 10 is made stronger on the inner side of the axial direction D than when the force of the case 2 acting on the base portion 11 is made smaller on the outer side than the inner side of the axial direction D. By holding the seal member 10, it is possible to prevent the seal member 10 from coming off outward in the axial direction D.

（第２実施形態）
以下、本発明の回転機械のシール構造の第２実施形態について添付図面を参照しながら説明する。なお、上述した第１実施形態と同様の構成については、同一の符号を付して説明を省略又は簡略化する。
図４は、第２実施形態に係るシール部材５０の断面図である。
図４に示すように、第２実施形態のシール部材５０は、上述した第１実施形態のシール部材１０と比較して、第１実施形態のベース部１１の代わりにベース部５１を備える点で相違している。
シール部材５０は、例えば、ベース部５１と、リップ部１２とを備える。ベース部５１は、芯部５２と、芯部５２を被覆する被覆部５３とを備える。ベース部５１は、外周部１１ａと、連結部５１ｂとを備える。外周部１１ａ及び連結部５１ｂは、一体に形成されている。
リップ部１２は、連結部５１ｂの端部５１ｄから径方向内方に突出している。リップ部１２は、連結部５１ｂと一体に形成されている。 (Second Embodiment)
Hereinafter, a second embodiment of the seal structure of the rotary machine of the present invention will be described with reference to the accompanying drawings. The same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted or simplified.
FIG. 4 is a cross-sectional view of the seal member 50 according to the second embodiment.
As shown in FIG. 4, the seal member 50 of the second embodiment includes a base portion 51 instead of the base portion 11 of the first embodiment as compared with the seal member 10 of the first embodiment described above. It is different.
The seal member 50 includes, for example, a base portion 51 and a lip portion 12. The base portion 51 includes a core portion 52 and a covering portion 53 that covers the core portion 52. The base portion 51 includes an outer peripheral portion 11a and a connecting portion 51b. The outer peripheral portion 11a and the connecting portion 51b are integrally formed.
The lip portion 12 protrudes inward in the radial direction from the end portion 51d of the connecting portion 51b. The lip portion 12 is integrally formed with the connecting portion 51b.

連結部５１ｂの外形は、外周部１１ａの軸方向外方側の端部１１ｃから軸方向内方に向かって凸状に湾曲しながら径方向内方に延びる円環状に形成されている。連結部５１ｂは、例えば、径方向外周側に湾曲部５４を備える。湾曲部５４の外形は、軸方向Ｄの内方に向かって凸状に湾曲する円環状に形成されている。
湾曲部５４は、例えば、外周部１１ａの軸方向外方側の端部１１ｃから湾曲部５４の内方先端部５４ａに向かって延びる湾曲外周部５４ｂと、内方先端部５４ａから連結部５１ｂの端部５１ｄに向かって延びる湾曲内周部５４ｃとを備える。 The outer shape of the connecting portion 51b is formed in an annular shape extending inward in the radial direction while being convexly curved inward in the axial direction from the end portion 11c on the outward side in the axial direction of the outer peripheral portion 11a. The connecting portion 51b includes, for example, a curved portion 54 on the outer peripheral side in the radial direction. The outer shape of the curved portion 54 is formed in an annular shape that is convexly curved inward in the axial direction D.
The curved portion 54 is, for example, a curved outer peripheral portion 54b extending from the axially outer end 11c of the outer peripheral portion 11a toward the inner tip portion 54a of the curved portion 54, and a connecting portion 51b from the inner tip portion 54a. It includes a curved inner peripheral portion 54c extending toward the end portion 51d.

湾曲部５４の内方先端部５４ａは、湾曲部５４が連結部５１ｂの径方向外周側に配置されていることによって、外周部１１ａとリップ部１２との間で径方向外周側に配置されている。これに伴い、湾曲内周部５４ｃの内面５４Ｃの面積は、相対的に湾曲外周部５４ｂの内面５４Ｂの面積よりも大きく形成されている。
また、湾曲外周部５４ｂの内面５４Ｂに作用する内圧ＩＰの方向（受圧方向）は、軸方向外方及び径方向内方に向かう方向である。湾曲内周部５４ｃの内面５４Ｃに作用する内圧ＩＰの方向（受圧方向）は、軸方向外方及び径方向外方に向かう方向である。なお、内圧ＩＰは、例えば回転機械１の内部空間の圧力である。
これらにより、湾曲部５４には内圧ＩＰによって追加的に外周部１１ａをケース２の内周面２Ａに押し付ける力が作用する。 The inner tip portion 54a of the curved portion 54 is arranged on the radial outer peripheral side between the outer peripheral portion 11a and the lip portion 12 because the curved portion 54 is arranged on the radial outer peripheral side of the connecting portion 51b. There is. Along with this, the area of the inner surface 54C of the curved inner peripheral portion 54c is formed to be relatively larger than the area of the inner surface 54B of the curved outer peripheral portion 54b.
Further, the direction (pressure receiving direction) of the internal pressure IP acting on the inner surface 54B of the curved outer peripheral portion 54b is an axially outward direction and a radial inward direction. The direction (pressure receiving direction) of the internal pressure IP acting on the inner surface 54C of the curved inner peripheral portion 54c is an axially outward direction and a radial outward direction. The internal pressure IP is, for example, the pressure in the internal space of the rotating machine 1.
As a result, a force that additionally presses the outer peripheral portion 11a against the inner peripheral surface 2A of the case 2 by the internal pressure IP acts on the curved portion 54.

上述したように、第２実施形態に係る回転機械１のシール構造では、シール部材５０は、外周部１１ａとリップ部１２とを連結する連結部５１ｂの径方向外周側に軸方向内方に向かって凸状に湾曲する湾曲部５４を備える。これにより、湾曲部５４には内圧ＩＰによって追加的に外周部１１ａをケース２の内周面２Ａに押し付ける力が作用する。例えば第１実施形態の連結部１１ｂのように湾曲部５４を備えない場合に比べて、シール部材５０をケース２に向かってより強く押すことによって、シール部材５０が軸方向Ｄの外方に抜け外れることを抑制することができる。 As described above, in the sealing structure of the rotary machine 1 according to the second embodiment, the sealing member 50 faces inward in the radial direction toward the radial outer peripheral side of the connecting portion 51b that connects the outer peripheral portion 11a and the lip portion 12. A curved portion 54 that is curved in a convex shape is provided. As a result, a force that additionally presses the outer peripheral portion 11a against the inner peripheral surface 2A of the case 2 by the internal pressure IP acts on the curved portion 54. For example, as compared with the case where the curved portion 54 is not provided as in the connecting portion 11b of the first embodiment, by pushing the seal member 50 more strongly toward the case 2, the seal member 50 is pulled out in the axial direction D. It can be suppressed from coming off.

また、湾曲部５４は連結部５１ｂに形成されているので、ベース部１１には追加的に連結部５１ｂがケース２を押す力が作用する。例えば湾曲部５４が連結部５１ｂに形成されていない場合に比べて、シール部材５０をケース２に向かってより強く押すことによって、シール部材５０が軸方向Ｄの外方に抜け外れることを抑制することができる。
なお、上述した第２実施形態では、シール部材５０は、連結部５１ｂに１つの湾曲部５４を備えるとしたが、これに限定されず、複数の湾曲部を備えてもよい。 Further, since the curved portion 54 is formed on the connecting portion 51b, an additional force by the connecting portion 51b to push the case 2 acts on the base portion 11. For example, as compared with the case where the curved portion 54 is not formed on the connecting portion 51b, by pushing the seal member 50 more strongly toward the case 2, it is possible to prevent the seal member 50 from coming off outward in the axial direction D. be able to.
In the second embodiment described above, the seal member 50 is provided with one curved portion 54 in the connecting portion 51b, but the present invention is not limited to this, and a plurality of curved portions may be provided.

また、上述した第２実施形態では、ケース２内の圧力の増大に伴いリップ部１２がケース２を押す力を増大させる増大手段を備えてもよい。増大手段は、上述したように連結部５１ｂに形成されることに限定されず、シール部材５０の他の部位に形成されてもよい。また、増大手段は、上述したように連結部５１ｂに形成される湾曲部５４に限定されず、他の構成を備えてもよい。これにより、ケース２内の圧力の増大に伴い、リップ部１２がケース２をより強く押すことによって、シール部材５０が軸方向Ｄの外方に抜け外れることを抑制することができる。 Further, in the second embodiment described above, an increasing means for increasing the force with which the lip portion 12 pushes the case 2 as the pressure in the case 2 increases may be provided. The increasing means is not limited to being formed on the connecting portion 51b as described above, and may be formed on another portion of the sealing member 50. Further, the increasing means is not limited to the curved portion 54 formed in the connecting portion 51b as described above, and may have other configurations. As a result, as the pressure inside the case 2 increases, the lip portion 12 pushes the case 2 more strongly, so that the seal member 50 can be prevented from coming off outward in the axial direction D.

（第３実施形態）
以下、本発明の回転機械のシール構造の第３実施形態について添付図面を参照しながら説明する。なお、上述した第１実施形態と同様の構成については、同一の符号を付して説明を省略又は簡略化する。
図５は、第３実施形態に係るシール部材６０の断面図である。
図５に示すように、第３実施形態のシール部材６０は、上述した第１実施形態のシール部材１０と比較して、ケース２に装着されるより前の自然状態における外形が同一形状に形成されている。また、上述した第１実施形態の変形例と同様にシール部材６０に接するケース２の内周部２ａの内周面２Ａは軸方向Ｄに平行である。
第３実施形態のシール部材６０は、相対的にケース２よりも熱膨張係数が大きい点で上述した第１実施形態及び変形例と相違している。
例えば、シール部材６０の芯部２１は、相対的にケース２よりも熱膨張係数が大きい金属材料によって形成されている。 (Third Embodiment)
Hereinafter, a third embodiment of the seal structure of the rotary machine of the present invention will be described with reference to the accompanying drawings. The same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted or simplified.
FIG. 5 is a cross-sectional view of the seal member 60 according to the third embodiment.
As shown in FIG. 5, the seal member 60 of the third embodiment has the same outer shape in the natural state before being mounted on the case 2 as compared with the seal member 10 of the first embodiment described above. Has been done. Further, the inner peripheral surface 2A of the inner peripheral portion 2a of the case 2 in contact with the seal member 60 is parallel to the axial direction D as in the modified example of the first embodiment described above.
The seal member 60 of the third embodiment is different from the first embodiment and modifications described above in that the coefficient of thermal expansion is relatively larger than that of the case 2.
For example, the core portion 21 of the seal member 60 is made of a metal material having a coefficient of thermal expansion relatively larger than that of the case 2.

上述したように、第３実施形態に係る回転機械１のシール構造では、シール部材６０は、相対的にケース２よりも熱膨張係数が大きい。これにより、シール部材６０は、回転機械１の作動に伴う温度上昇時にケース２よりも膨張しやすい。例えばシール部材６０及びケース２の熱膨張係数がほぼ同一である場合又はシール部材６０の熱膨張係数が相対的にケース２の熱膨張係数よりも小さい場合に比べて、シール部材６０がケース２によってより強く保持されることによって、シール部材６０が軸方向Ｄの外方に抜け外れることを抑制することができる。 As described above, in the sealing structure of the rotating machine 1 according to the third embodiment, the sealing member 60 has a relatively larger coefficient of thermal expansion than the case 2. As a result, the seal member 60 is more likely to expand than the case 2 when the temperature rises due to the operation of the rotating machine 1. For example, as compared with the case where the coefficient of thermal expansion of the seal member 60 and the case 2 is substantially the same or the coefficient of thermal expansion of the seal member 60 is relatively smaller than the coefficient of thermal expansion of the case 2, the seal member 60 is made of the case 2. By being held more strongly, it is possible to prevent the seal member 60 from coming off outward in the axial direction D.

なお、上述した第３実施形態では、芯部２１は、相対的にケース２よりも熱膨張係数が大きい金属材料によって形成されているとしたが、これに限定されず、例えば相対的にケース２よりも熱膨張係数が大きい樹脂材料などの素材によって形成されてもよい。
また、上述した第３実施形態では、芯部２１の熱膨張係数はケース２の熱膨張係数よりも大きいとしたが、これに限定されない。例えば、芯部２１の代わりに又は芯部２１に加えて、被覆部２２の熱膨張係数をケース２の熱膨張係数よりも大きくしてもよい。 In the third embodiment described above, the core portion 21 is formed of a metal material having a coefficient of thermal expansion relatively larger than that of case 2, but the present invention is not limited to this, and for example, case 2 is relatively present. It may be formed of a material such as a resin material having a larger coefficient of thermal expansion than.
Further, in the third embodiment described above, the coefficient of thermal expansion of the core portion 21 is larger than the coefficient of thermal expansion of case 2, but the present invention is not limited to this. For example, instead of the core portion 21, or in addition to the core portion 21, the coefficient of thermal expansion of the covering portion 22 may be larger than the coefficient of thermal expansion of the case 2.

また、上述した第３実施形態では、シール部材６０を構成するベース部１１の外周部１１ａ及び連結部１１ｂとリップ部１２とのうち少なくとも一部は、ケース２よりも熱膨張係数が大きい素材によって形成されてもよい。これにより、シール部材６０を構成するベース部１１の外周部１１ａ及び連結部１１ｂとリップ部１２とのうち少なくとも一部は、温度上昇時にケース２よりも膨張しやすい。例えばリップ部１２及びベース部１１とケース２との熱膨張係数がほぼ同一である場合又はリップ部１２及びベース部１１の熱膨張係数がケース２の熱膨張係数よりも小さい場合に比べて、シール部材６０がケース２によってより強く保持されることによって、シール部材６０が軸方向Ｄの外方に抜け外れることを抑制することができる。 Further, in the third embodiment described above, at least a part of the outer peripheral portion 11a, the connecting portion 11b, and the lip portion 12 of the base portion 11 constituting the seal member 60 is made of a material having a coefficient of thermal expansion larger than that of the case 2. It may be formed. As a result, at least a part of the outer peripheral portion 11a, the connecting portion 11b, and the lip portion 12 of the base portion 11 constituting the seal member 60 is more likely to expand than the case 2 when the temperature rises. For example, the seal is compared with the case where the coefficient of thermal expansion of the lip portion 12 and the base portion 11 and the case 2 is substantially the same, or the coefficient of thermal expansion of the lip portion 12 and the base portion 11 is smaller than the coefficient of thermal expansion of the case 2. By holding the member 60 more strongly by the case 2, it is possible to prevent the seal member 60 from coming off outward in the axial direction D.

また、上述した第３実施形態では、ケース２の温度上昇に伴いリップ部１２がケース２を押す力を増大させる増大手段を備えてもよい。増大手段は、上述したようにシール部材６０の少なくとも一部をケース２よりも熱膨張係数が大きい素材によって形成することに限定されず、他の構成を備えてもよい。これにより、ケース２内の温度上昇に伴い、リップ部１２がケース２をより強く押すことによって、シール部材６０が軸方向Ｄの外方に抜け外れることを抑制することができる。 Further, in the third embodiment described above, an increasing means for increasing the force with which the lip portion 12 pushes the case 2 as the temperature of the case 2 rises may be provided. As described above, the increasing means is not limited to forming at least a part of the sealing member 60 from a material having a coefficient of thermal expansion larger than that of the case 2, and may have other configurations. As a result, as the temperature inside the case 2 rises, the lip portion 12 pushes the case 2 more strongly, so that the seal member 60 can be prevented from coming off outward in the axial direction D.

なお、上述した各実施形態及び変形例では、回転機械１は、例えば、偏心揺動型減速機などの減速機又は回転電機などでもよい。
また、上述した各実施形態及び変形例では、各シール部材１０，５０，６０は、ケース２の代わりに、例えばモータフランジ及びオイルシールフランジなどの部材に装着されてもよい。
また、上述した各実施形態及び変形例では、各シール部材１０，５０，６０は、単に、各シール１０，５０，６０と称してもよい。 In each of the above-described embodiments and modifications, the rotary machine 1 may be, for example, a speed reducer such as an eccentric swing type speed reducer or a rotary electric machine.
Further, in each of the above-described embodiments and modifications, the seal members 10, 50, and 60 may be mounted on members such as a motor flange and an oil seal flange instead of the case 2.
Further, in each of the above-described embodiments and modifications, the seal members 10, 50, 60 may be simply referred to as the seals 10, 50, 60.

本発明の実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。 The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention as well as the invention described in the claims and the equivalent scope thereof.

１…回転機械、２…ケース、２ａ…内周部、３…軸部材、１０，５０，６０…シール部材（シール）、１１…ベース部、１１ａ…外周部、１１ｂ，５１ｂ…連結部、１２…リップ部（内周部）、２１…芯部、２２…被覆部、４１…内径変化部、４１Ａ…内周面４１Ａ、４２…外径変化部、４２Ｂ…外周面、５４…湾曲部 1 ... Rotating machine, 2 ... Case, 2a ... Inner peripheral part, 3 ... Shaft member, 10, 50, 60 ... Seal member (seal), 11 ... Base part, 11a ... Outer peripheral part, 11b, 51b ... Connecting part, 12 ... Lip portion (inner peripheral portion), 21 ... Core portion, 22 ... Covering portion, 41 ... Inner diameter changing portion, 41A ... Inner peripheral surface 41A, 42 ... Outer diameter changing portion, 42B ... Outer peripheral surface, 54 ... Curved portion

本発明の一態様に係るシールは、リップ部と、ベース部と、連結部と、を備える。リップ部は、ケースの内周に配置された部材に接触する。ベース部は、ケースに固定される。連結部は、ベース部とリップ部とを接続する。ベース部に作用するケースの力が軸方向の外方側よりも内方側で大きくされている。 The seal according to one aspect of the present invention includes a lip portion, a base portion, and a connecting portion. The lip portion comes into contact with a member arranged on the inner circumference of the case. The base portion is fixed to the case. The connecting portion connects the base portion and the lip portion. Force of the case that acts on the base portion is made larger in the inner side side than the outer side in the axial direction.

上述したように、第１実施形態の変形例に係る回転機械１のシール構造では、シール部材１０の外径変化部４２の外周面４２Ｂは、ケース２に装着されるより前の自然状態で軸方向Ｄに対して所定角度θだけ傾斜するテーパ状に形成されている。これにより、シール部材１０の外周部１１ａからケース２の内周部２ａに作用する力に対するケース２の内周部２ａの法線反力ＲＦは、軸方向Ｄの外方側よりも内方側でより大きくなる。例えばケース２の内周部２ａの法線反力ＲＦが軸方向Ｄの外方側及び内方側でほぼ同じ大きさである場合に比べて、シール部材１０を軸方向Ｄの内方側でより強く保持することによって、シール部材１０が軸方向Ｄの外方に抜け外れることを抑制することができる。 As described above, in the sealing structure of the rotating machine 1 according to the modified example of the first embodiment, the outer peripheral surface 42 B of the outer diameter changing portion 42 of the sealing member 10 is in a natural state before being mounted on the case 2. It is formed in a tapered shape that is inclined by a predetermined angle θ with respect to the axial direction D. As a result, the normal reaction force RF of the inner peripheral portion 2a of the case 2 with respect to the force acting from the outer peripheral portion 11a of the sealing member 10 to the inner peripheral portion 2a of the case 2 is on the inner side of the outer side in the axial direction D. Will be bigger. For example, the seal member 10 is placed on the inner side of the axial direction D as compared with the case where the normal reaction force RF of the inner peripheral portion 2a of the case 2 is substantially the same on the outer side and the inner side of the axial direction D. By holding the seal member 10 more strongly, it is possible to prevent the seal member 10 from coming off outward in the axial direction D.

また、湾曲部５４は連結部５１ｂに形成されているので、ベース部５１には追加的に連結部５１ｂがケース２を押す力が作用する。例えば湾曲部５４が連結部５１ｂに形成されていない場合に比べて、シール部材５０をケース２に向かってより強く押すことによって、シール部材５０が軸方向Ｄの外方に抜け外れることを抑制することができる。
なお、上述した第２実施形態では、シール部材５０は、連結部５１ｂに１つの湾曲部５４を備えるとしたが、これに限定されず、複数の湾曲部を備えてもよい。 Further, the curved portion 54 because it is formed in the connecting portion 51b, the base portion 5 1 additionally connecting portion 51b is a force pushing the case 2 is applied. For example, as compared with the case where the curved portion 54 is not formed on the connecting portion 51b, by pushing the seal member 50 more strongly toward the case 2, it is possible to prevent the seal member 50 from coming off outward in the axial direction D. be able to.
In the second embodiment described above, the seal member 50 is provided with one curved portion 54 in the connecting portion 51b, but the present invention is not limited to this, and a plurality of curved portions may be provided.

１…回転機械、２…ケース、２ａ…内周部、３…軸部材、１０，５０，６０…シール部材（シール）、１１，５１…ベース部、１１ａ…外周部、１１ｂ，５１ｂ…連結部、１２…リップ部（内周部）、２１…芯部、２２…被覆部、４１…内径変化部、４１Ａ…内周面、４２…外径変化部、４２Ｂ…外周面、５４…湾曲部 1 ... Rotating machine, 2 ... Case, 2a ... Inner peripheral part, 3 ... Shaft member, 10, 50, 60 ... Seal member (seal), 11 , 51 ... Base part, 11a ... Outer peripheral part, 11b, 51b ... Connecting part , 12 ... Lip part (inner peripheral part), 21 ... Core part, 22 ... Covering part, 41 ... Inner diameter changing part, 41A ... Inner peripheral surface , 42 ... Outer diameter changing part, 42B ... Outer peripheral surface, 54 ... Curved part

Claims (11)

軸方向の外方側から内方側に向かうことに伴って径の長さが増大する内周部を有するケースと、
前記ケースの内部に配置された軸部材と、
前記ケースと前記軸部材との間をシールするシール部材と、
を備えるシール構造。 A case having an inner peripheral portion whose diameter length increases as it goes from the outer side to the inner side in the axial direction, and
A shaft member arranged inside the case and
A sealing member that seals between the case and the shaft member,
Seal structure with. ケースと、
前記ケースの内部に配置された軸部材と、
軸方向の外方側から内方側に向かうことに伴って径の長さが増大する外周部を有し、前記ケースと前記軸部材との間をシールするシール部材と、
を備えるシール構造。 With the case
A shaft member arranged inside the case and
A seal member having an outer peripheral portion whose diameter length increases from the outer side to the inner side in the axial direction and sealing between the case and the shaft member.
Seal structure with. ケースと、
前記ケースの内部に配置される軸部材と、
前記ケースと前記軸部材との間をシールするシール部材と、
前記ケースに接触する前記シール部材の外周部と前記軸部材に接触する前記シール部材の内周部とを連結するとともに軸方向の内方に向かって凸状に湾曲する連結部と、
を備えるシール構造。 With the case
A shaft member arranged inside the case and
A sealing member that seals between the case and the shaft member,
A connecting portion that connects the outer peripheral portion of the sealing member that contacts the case and the inner peripheral portion of the sealing member that contacts the shaft member and is curved inward in the axial direction.
Seal structure with. 前記連結部は、外周側で前記軸方向の内方に向かって凸状に湾曲する湾曲部を備える
請求項３に記載のシール構造。 The seal structure according to claim 3, wherein the connecting portion includes a curved portion that is convexly curved inward in the axial direction on the outer peripheral side. ケースと、
前記ケースの内部に配置される軸部材と、
前記ケースと前記軸部材との間をシールするとともに、前記ケースよりも熱膨張係数が大きいシール部材と、
を備えるシール構造。 With the case
A shaft member arranged inside the case and
A sealing member that seals between the case and the shaft member and has a larger coefficient of thermal expansion than the case.
Seal structure with. ケースの内周に配置された部材に接触するリップ部と、
前記ケースに固定されるベース部と、
前記ベース部と前記リップ部とを接続する連結部と、
を備え、
前記ベース部に作用する前記ケースの力が軸方向の内方側よりも外方側で大きくされたシール。 The lip part that comes into contact with the members placed on the inner circumference of the case,
The base part fixed to the case and
A connecting portion that connects the base portion and the lip portion,
With
A seal in which the force of the case acting on the base portion is increased on the outer side than on the inner side in the axial direction. ケースの内周に配置された部材に接触するリップ部と、
前記ケースに固定されるベース部と、
前記ベース部と前記リップ部とを接続する連結部と、
前記ケース内の圧力の増大に伴い前記リップ部が前記ケースを押す力を増大させる増大手段と、
を備えるシール。 The lip part that comes into contact with the members placed on the inner circumference of the case,
The base part fixed to the case and
A connecting portion that connects the base portion and the lip portion,
An increasing means for increasing the force with which the lip portion pushes the case as the pressure in the case increases.
A seal with. ケースの内周に配置された部材に接触するリップ部と、
前記ケースに固定されるベース部と、
前記ベース部と前記リップ部とを接続する連結部と、
前記ケース内の温度上昇に伴い前記リップ部が前記ケースを押す力を増大させる増大手段と、
を備えるシール。 The lip part that comes into contact with the members placed on the inner circumference of the case,
The base part fixed to the case and
A connecting portion that connects the base portion and the lip portion,
An increasing means for increasing the force with which the lip portion pushes the case as the temperature inside the case rises.
A seal with. 前記増大手段は前記連結部に形成されている
請求項７又は請求項８に記載のシール。 The seal according to claim 7 or 8, wherein the augmenting means is formed in the connecting portion. 前記増大手段は軸方向の内方に向かって凸状に湾曲する湾曲部を備える
請求項７に記載のシール。 The seal according to claim 7, wherein the increasing means includes a curved portion that curves inward in the axial direction. 前記増大手段は、前記リップ部、前記ベース部及び前記連結部のうちの少なくとも一部を形成する前記ケースよりも熱膨張係数が大きい素材である
請求項８に記載のシール。 The seal according to claim 8, wherein the increasing means is a material having a larger coefficient of thermal expansion than the case forming at least a part of the lip portion, the base portion and the connecting portion.
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