JP5896115B2 - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
JP5896115B2
JP5896115B2 JP2011257406A JP2011257406A JP5896115B2 JP 5896115 B2 JP5896115 B2 JP 5896115B2 JP 2011257406 A JP2011257406 A JP 2011257406A JP 2011257406 A JP2011257406 A JP 2011257406A JP 5896115 B2 JP5896115 B2 JP 5896115B2
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metal ring
outer peripheral
oil seal
dust cover
muddy water
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JP2013113319A5 (en
JP2013113319A (en
Inventor
昌幸 谷田
昌幸 谷田
松井　宏樹
宏樹 松井
啓 山口
啓 山口
英明 長浜谷
英明 長浜谷
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Nok Corp
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Nok Corp
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Priority to JP2011257406A priority Critical patent/JP5896115B2/en
Priority to PCT/JP2012/059750 priority patent/WO2013077010A1/en
Priority to CN201290000885.XU priority patent/CN203847704U/en
Publication of JP2013113319A publication Critical patent/JP2013113319A/en
Publication of JP2013113319A5 publication Critical patent/JP2013113319A5/ja
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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
    • F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other

Description

本発明は、車両のトランスファー装置やトランスミッション、デファレンシャルギヤなど、機外からの泥水等に曝されやすい部分の軸周等を密封する密封装置であって、特に、回転側のダストカバーに密接させた対泥水シールリップによって、対油シールリップ側への泥水の浸入を防止する構造を備えるものに関する。   The present invention is a sealing device that seals a shaft periphery of a portion that is easily exposed to muddy water from outside the machine, such as a vehicle transfer device, a transmission, and a differential gear, and in particular, is in close contact with a dust cover on a rotating side. The present invention relates to a structure provided with a structure that prevents muddy water from entering the oil seal lip side by the muddy water seal lip.

機外からの泥水等に曝されやすい部分の軸周等を密封する密封装置として、従来から、図３に示すようなものが知られている。 2. Description of the Related Art Conventionally, as shown in FIG. 3 , a sealing device that seals a shaft periphery of a portion that is easily exposed to muddy water or the like from the outside of the machine is known.

図３において、参照符号２は車両のトランスファー装置等のハウジング、参照符号３は前記ハウジング２に挿通された回転軸である。密封装置１００は、ハウジング２の内周に取り付けられた非回転のオイルシール１１０と、このオイルシール１１０の軸方向外側に位置して回転軸３の外周に取り付けられ、回転軸３と一体に回転される金属製のダストカバー１２０を備える。 In FIG. 3 , reference numeral 2 is a housing such as a vehicle transfer device, and reference numeral 3 is a rotating shaft inserted through the housing 2. The sealing device 100 is a non-rotating oil seal 110 attached to the inner periphery of the housing 2, and is attached to the outer periphery of the rotating shaft 3, located outside the oil seal 110 in the axial direction, and rotates together with the rotating shaft 3. The metal dust cover 120 is provided.

詳しくは、オイルシール１１０は、機内を向いて延びる対油シールリップ１１１と、この対油シールリップ１１１と反対側（外側）を向いて延びる対泥水シールリップ１１２を有する。対油シールリップ１１１は、回転軸３の外周面に摺動可能に密接されることによって機内油の漏洩を防止するものであり、対泥水シールリップ１１２は、ダストカバー１２０のフランジ部１２１に摺動可能に密接されることによって、機外Ａから飛来する泥水等が、対油シールリップ１１１側へ浸入するのを抑制するものであり、ダストカバー１２０自体も、そのフランジ部１２１に生じる遠心力による振り切り作用を有し、更にその外径に形成された外筒部１２２をハウジング２の端部外周面に近接させることによって、泥水等の浸入に対する抑制効果の向上を図っている（例えば下記の特許文献参照）。   Specifically, the oil seal 110 includes an oil seal lip 111 extending toward the inside of the machine and an anti-mud seal lip 112 extending toward the opposite side (outside) of the oil seal lip 111. The oil seal lip 111 is slidably in close contact with the outer peripheral surface of the rotary shaft 3 to prevent leakage of oil in the machine, and the mud seal lip 112 slides on the flange portion 121 of the dust cover 120. Due to the close movement, mud water or the like flying from outside the machine A is prevented from entering the oil seal lip 111 side, and the dust cover 120 itself also has a centrifugal force generated in its flange portion 121. Further, the outer cylinder portion 122 formed on the outer diameter of the housing 2 is brought close to the outer peripheral surface of the end portion of the housing 2 to improve the effect of suppressing the intrusion of muddy water (for example, the following) See patent literature).

特開２００９−１０３２０９号公報JP 2009-103209 A

この種の密封装置において、一層優れた耐泥水性能を求められる場合は、対泥水シールリップの枚数を増やすことが考えられるが、その場合、摺動トルクによるエネルギ損失が増大してしまうといった問題も指摘される。   In this type of sealing device, when more excellent muddy water resistance is required, it is conceivable to increase the number of muddy water sealing lips, but in that case, there is a problem that energy loss due to sliding torque increases. be pointed out.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、機内油の漏洩を防止すると共に機外からの泥水の浸入を防止する密封装置において、摺動トルクによるエネルギ損失の増大を抑制することにある。 The present invention has been made in view of the above points, and a technical problem thereof is a sliding torque in a sealing device that prevents leakage of oil in the machine and prevents intrusion of muddy water from the outside of the machine. The purpose is to suppress an increase in energy loss due to.

上述した技術的課題を有効に解決するための手段として、請求項１の発明に係る密封装置は、第一の金属環に対油シールリップが一体に成形されると共に前記第一の金属環に機外側に面して第二の金属環が密接嵌合され静止側に取り付けられるオイルシールと、このオイルシールの機外側に位置して回転側に取り付けられるダストカバーと、前記ダストカバーに一体に成形されると共に前記第二の金属環のフランジ部に摺動可能に密接される内周側の対泥水シールリップと、前記ダストカバーに一体に成形されると共に前記第二の金属環の外周筒部の内周面に摺動可能に密接される外周側の対泥水シールリップと、を備え、前記ダストカバーに形成された外周筒部が前記オイルシールの第一の金属環に形成された外周筒部の外周側を包囲するように延び、前記第二の金属環が低摩擦材からなり、前記低摩擦材が、前記第一の金属環と反対側の面に固体潤滑材料が設けられた金属板及び前記第一の金属環と反対側の面に鏡面が形成された金属板のいずれかから選択されたものであり、前記第二の金属環の外周筒部が前記第一の金属環の外周筒部の内周面に一体的に嵌着されたものである。 As a means for effectively solving the technical problem described above, the sealing device according to the invention of claim 1 includes an oil seal lip integrally formed on the first metal ring and the first metal ring. An oil seal that faces the outside of the machine and the second metal ring is closely fitted and attached to the stationary side, a dust cover that is located on the outside of the machine and attached to the rotating side, and is integrated with the dust cover An inner mud-water seal lip that is molded and slidably in close contact with the flange portion of the second metal ring, and an outer peripheral cylinder of the second metal ring that is molded integrally with the dust cover And an outer peripheral cylinder portion formed on the dust cover and formed on the first metal ring of the oil seal. Surround the outer periphery of the tube Extends cormorants, the second metal ring is made of a low friction material, the low friction material, said first metal ring opposite the solid lubricating material is a metal plate and the provided on a surface a first metal ring Is selected from any one of the metal plates having a mirror surface formed on the opposite surface, and the outer peripheral cylindrical portion of the second metal ring is the inner peripheral surface of the outer peripheral cylindrical portion of the first metal ring. It is fitted together .

本発明に係る密封装置によれば、複数の対泥水シールリップを設けても、摺動トルクによるエネルギ損失の増大を抑制することができる。 According to the sealing device according to the present invention, an increase in energy loss due to sliding torque can be suppressed even when a plurality of muddy water seal lips are provided .

本発明に係る密封装置の実施の形態を、その軸心を通る平面で切断して示す未装着状態の半断面図である。It is a half sectional view of the unmounted state which cuts and shows the embodiment of the sealing device concerning the present invention by the plane which passes along the axis. 本発明に係る密封装置の実施の形態を、その軸心を通る平面で切断して示す装着状態の半断面図である。It is a half section view of the wearing state which cuts and shows the embodiment of the sealing device concerning the present invention by the plane which passes along the axis. 従来の技術に係る密封装置の一例を、その軸心を通る平面で切断して示す装着状態の半断面図である。It is a half sectional view of the wearing state which cuts and shows an example of the sealing device concerning the prior art by the plane which passes along the axis.

以下、本発明に係る密封装置の好ましい実施の形態について、図１及び図２を参照しながら説明する。 Hereinafter, a preferred embodiment of a sealing device according to the present invention will be described with reference to FIGS. 1 and 2 .

図２において、参照符号２は非回転のハウジング、参照符号３は前記ハウジング２に挿通され軸心の周りに回転可能な回転軸、参照符号１は本発明に係る密封装置で、ハウジング２の開口端部２ａの内周面に取り付けられたオイルシール１０と、回転軸３の外周面に前記オイルシール１０の機外Ａ側に位置して取り付けられたダストカバー２０を備える。なお、ハウジング２は請求項１に記載された静止側、回転軸３は請求項１に記載された回転側に相当する。   In FIG. 2, reference numeral 2 is a non-rotating housing, reference numeral 3 is a rotating shaft that is inserted through the housing 2 and is rotatable around an axis, and reference numeral 1 is a sealing device according to the present invention. An oil seal 10 attached to the inner peripheral surface of the end 2a and a dust cover 20 attached to the outer peripheral surface of the rotating shaft 3 so as to be positioned on the outside A side of the oil seal 10 are provided. The housing 2 corresponds to the stationary side described in claim 1, and the rotating shaft 3 corresponds to the rotating side described in claim 1.

オイルシール１０は、第一の金属環１１にゴム材料で一体に成形された外周シール部１２、対油シールリップ１３、ダストリップ１４及び泥水受け１８と、前記第一の金属環１１に機外Ａ側に面して密接嵌合された第二の金属環１５を備えるものである。 The oil seal 10 includes an outer peripheral seal portion 12, an oil seal lip 13, a dust lip 14, and a muddy water receiver 18 that are integrally formed with a first metal ring 11 with a rubber material, and the first metal ring 11. A second metal ring 15 facing the A side and closely fitted is provided.

詳しくは、オイルシール１０における第一の金属環１１は、ハウジング２の開口端部２ａの内周面に圧入嵌着される圧入筒部１１ａと、そこから機内Ｂ側へ向けて漸次小径になるように延びる外周シール保持部１１ｂと、そこから機内Ｂと反対側へ向けて折り返された内周筒部１１ｃと、この内周筒部１１ｃの端部から内径側へ屈曲した内径フランジ部１１ｄと、前記圧入筒部１１ａの機外Ａ側の端部から外径側へ延びる外径フランジ部１１ｅと、さらにその外径端部から図２の装着状態においてハウジング２と反対側へ屈曲して延びる外周筒部１１ｆからなる。 Specifically, the first metal ring 11 in the oil seal 10 has a press-fit cylinder portion 11a that is press-fit into the inner peripheral surface of the opening end portion 2a of the housing 2, and gradually decreases in diameter toward the in-machine B side. An outer peripheral seal holding portion 11b that extends in this manner, an inner peripheral cylindrical portion 11c that is folded back toward the opposite side of the machine B, and an inner diameter flange portion 11d that is bent from the end of the inner peripheral cylindrical portion 11c toward the inner diameter side. An outer diameter flange portion 11e extending from the end on the outside A side of the press-fitted cylinder portion 11a to the outer diameter side, and further bending and extending from the outer diameter end portion to the opposite side of the housing 2 in the mounted state of FIG. It consists of an outer peripheral cylinder part 11f.

オイルシール１０における外周シール部１２は第一の金属環１１の外周シール保持部１１ｂの外周面に加硫接着されていて、ハウジング２の開口端部２ａの内周面に圧入嵌着されるものであり、対油シールリップ１３は、その根元が第一の金属環１１の内径フランジ部１１ｄに加硫接着されていて、機内Ｂ側へ延び、先端近傍の内径エッジ部１３ａが回転軸３の外周面に摺動可能に密接されるものであり、ダストリップ１４は、その根元が対油シールリップ１３の根元から分岐していて、この対油シールリップ１３と反対側へ延び、先端が回転軸３の外周面に摺動可能に密接されるものであり、泥水受け１８は、ダストリップ１４の外周側に位置して、根元が第一の金属環１１の内径フランジ部１１ｄに加硫接着され、対油シールリップ１３と反対側へ向けて漸次大径となる形状に突出したものである。対油シールリップ１３にはその緊迫力及び径方向追随性を補償するガータスプリング１７が装着されている。   The outer peripheral seal portion 12 of the oil seal 10 is vulcanized and bonded to the outer peripheral surface of the outer peripheral seal holding portion 11b of the first metal ring 11, and is press-fitted to the inner peripheral surface of the open end 2a of the housing 2. The base of the anti-oil seal lip 13 is vulcanized and bonded to the inner diameter flange portion 11d of the first metal ring 11, extends toward the machine B side, and the inner diameter edge portion 13a near the tip of the rotary shaft 3 The dust lip 14 is slidably in close contact with the outer peripheral surface, and the base of the dust lip 14 branches off from the root of the oil seal lip 13 and extends to the opposite side of the oil seal lip 13, and the tip rotates. The muddy water receiver 18 is slidably in contact with the outer peripheral surface of the shaft 3, and the muddy water receiver 18 is located on the outer peripheral side of the dust lip 14 and is vulcanized and bonded to the inner diameter flange portion 11 d of the first metal ring 11. And oil seal lip 13 Toward the opposite side is obtained by projecting the shape gradually becomes large. A garter spring 17 is attached to the oil seal lip 13 to compensate for its tightness and radial followability.

第二の金属環１５は第一の金属環１１と反対側の面をＰＴＦＥ（ポリテトラフルオロエチレン）やカーボンなどの固体潤滑材料をコーティングした金属板や鏡面加工した金属板などの低摩擦材で製作されたものであって、第一の金属環１１の外周筒部１１ｆの内周面に圧入嵌着により一体化された外周筒部１５ａと、この外周筒部１５ａから内径側へ延びて外径部が第一の金属環１１の外径フランジ部１１ｅと密接されたフランジ部１５ｂからなる。   The second metal ring 15 is a low-friction material such as a metal plate coated with a solid lubricating material such as PTFE (polytetrafluoroethylene) or carbon on the surface opposite to the first metal ring 11 or a mirror-finished metal plate. An outer peripheral cylindrical portion 15a that is manufactured by press fitting into the inner peripheral surface of the outer peripheral cylindrical portion 11f of the first metal ring 11, and extends from the outer peripheral cylindrical portion 15a to the inner diameter side. The diameter portion is composed of a flange portion 15 b in close contact with the outer diameter flange portion 11 e of the first metal ring 11.

ダストカバー２０は例えば金属板を打ち抜きプレス成形することにより製作されたものであって、回転軸３の外周面に圧入嵌着される内径筒部２０ａと、この内径筒部２０ａから外径方向へ円盤状に展開した内径フランジ部２０ｄと、その外径部からオイルシール１０における第二の金属環１５の外周筒部１５ａの内周空間へ向けて凸形状となるように折り返された折り返し部２０ｅと、この折り返し部２０ｅから外径方向へ円盤状に展開した外径フランジ部２０ｆと、更にその外径端部から図２の装着状態におけるハウジング２の開口端部２ａの外周側へ向けて、オイルシール１０における第一の金属環１１の外周筒部１１ｆの外周側を包囲するように延びる外周筒部２０ｃからなる。 The dust cover 20 is manufactured, for example, by punching and press-molding a metal plate. The dust cover 20 is press-fitted to the outer peripheral surface of the rotary shaft 3 and the outer diameter direction from the inner diameter cylindrical portion 20a. An inner diameter flange portion 20d developed in a disk shape, and a folded portion 20e folded from the outer diameter portion so as to be convex toward the inner circumferential space of the outer peripheral cylindrical portion 15a of the second metal ring 15 in the oil seal 10. And an outer diameter flange portion 20f developed in a disk shape from the folded portion 20e to the outer diameter direction, and further from the outer diameter end portion toward the outer peripheral side of the opening end portion 2a of the housing 2 in the mounted state of FIG. The oil seal 10 includes an outer peripheral cylindrical portion 20c extending so as to surround the outer peripheral side of the outer peripheral cylindrical portion 11f of the first metal ring 11.

ダストカバー２０には、オイルシール１０側を向いた面にゴム材料からなる二段の対泥水シールリップ２１，２２が一体に成形されている。また、この対泥水シールリップ２１，２２の根元から延びるゴム層２３が、前記ダストカバー２０のオイルシール１０側を向いた面のほぼ全面を覆うように加硫接着されている。   The dust cover 20 is integrally formed with two-stage mud seal lips 21 and 22 made of a rubber material on the surface facing the oil seal 10 side. Further, the rubber layer 23 extending from the base of the muddy water seal lips 21 and 22 is vulcanized and bonded so as to cover almost the entire surface of the dust cover 20 facing the oil seal 10 side.

二段の対泥水シールリップ２１，２２のうち、内周側の対泥水シールリップ２１は、その根元がゴム層２３を介してダストカバー２０の内径フランジ部２０ｄに接着され、図１に示す未装着状態では、オイルシール１０側へ向けて漸次大径になる円錐筒状をなしており、図２に示す装着状態では、適当に湾曲変形された状態でオイルシール１０における第二の金属環１５のフランジ部１５ｂに摺動可能に密接されるものである。 Of the two-stage muddy water seal lips 21, 22, the inner circumferential side anti-muddy water seal lip 21 is bonded to the inner diameter flange portion 20 d of the dust cover 20 via the rubber layer 23, and is not shown in FIG. In the mounted state, it has a conical cylinder shape that gradually increases in diameter toward the oil seal 10 side . In the mounted state shown in FIG. 2 , the second metal ring 15 in the oil seal 10 is curved and deformed appropriately. The flange portion 15b is in close contact with the flange portion 15b.

一方、外周側の対泥水シールリップ２２は、その根元がゴム層２３を介してダストカバー２０の折り返し部２０ｅの頂部付近に加硫接着され、根元から途中まではオイルシール１０側へ向けて漸次大径になり、そこから外径側へ屈曲した形状に形成されている。そして図２に示す装着状態では、適当に湾曲されて先端が機外Ａ側を向いた状態でオイルシール１０における第二の金属環１５の外周筒部１５ａの内周面に摺動可能に密接されるものである。 On the other hand, the base of the outer peripheral mud seal lip 22 is vulcanized and bonded to the vicinity of the top of the folded portion 20e of the dust cover 20 via the rubber layer 23, and gradually goes from the root to the oil seal 10 side. It has a large diameter and is formed into a shape bent from there to the outer diameter side. In the mounted state shown in FIG. 2 , the oil seal 10 is slidably in close contact with the inner peripheral surface of the outer peripheral cylindrical portion 15a of the second metal ring 15 in a state where it is appropriately curved and the front end faces the outside A side. It is what is done.

また、図２に示す装着状態では、オイルシール１０の第一及び第二の金属環１１，１５の外周筒部１１ｆ，１５ａは、ダストカバー２０の外径フランジ部２０ｆと近接対向しており、このため前記外周筒部１１ｆ，１５ａとダストカバー２０の折り返し部２０ｅ、外径フランジ部２０ｆ及び外周筒部２０ｃとの間には横向きの「Ｊ」字形に折れ曲がったラビリンス状の隙間Ｌが形成されている。 In the mounted state shown in FIG. 2 , the outer peripheral cylindrical portions 11 f and 15 a of the first and second metal rings 11 and 15 of the oil seal 10 are in close proximity to the outer diameter flange portion 20 f of the dust cover 20, Therefore, a labyrinth-like gap L bent in a lateral “J” shape is formed between the outer peripheral cylindrical portions 11f and 15a and the folded portion 20e of the dust cover 20, the outer diameter flange portion 20f, and the outer peripheral cylindrical portion 20c. ing.

以上のように構成された密封装置１において、オイルシール１０は、第一の金属環１１の圧入筒部１１ａを外周シール部１２と共にハウジング２の開口端部２ａの内周面に圧入し、前記第一の金属環１１の外径フランジ部１１ｅを前記開口端部２ａの先端に当接させることによって、ハウジング２に位置決め固定する。また、ダストカバー２０は、その内径筒部２０ａを回転軸３の外周面に圧入嵌着すると共に、内径フランジ部２０ｄ及び外径フランジ部２０ｆを回転軸３のフランジ部に当接させることによって位置決め固定し、図示の装着状態とする。 In the sealing device 1 configured as described above, the oil seal 10 press-fits the press-fit cylinder portion 11a of the first metal ring 11 together with the outer peripheral seal portion 12 into the inner peripheral surface of the opening end portion 2a of the housing 2. The first metal ring 11 is positioned and fixed to the housing 2 by bringing the outer diameter flange portion 11e of the first metal ring 11 into contact with the tip of the opening end portion 2a. The dust cover 20 is positioned by press-fitting the inner diameter cylindrical portion 20 a to the outer peripheral surface of the rotary shaft 3 and bringing the inner diameter flange portion 20 d and the outer diameter flange portion 20 f into contact with the flange portion of the rotary shaft 3. Fix and set to the mounted state shown in the figure.

オイルシール１０の対油シールリップ１３は、回転軸３の外周面に摺動可能に密接されることによって、機内油が機外Ａへ漏洩するのを防止するものである。   The oil seal lip 13 of the oil seal 10 is slidably brought into close contact with the outer peripheral surface of the rotary shaft 3 to prevent the oil in the machine from leaking out of the machine A.

一方、対泥水シールリップ２１，２２の外周側には、ラビリンス状の隙間Ｌが形成されているので、機外Ａから飛来する泥水等が対泥水シールリップ２１，２２による密封摺動部へ入りにくいものとなっており、ダストカバー２０に設けられた対泥水シールリップ２１，２２は、回転軸３と一体に回転されるダストカバー２０と共に回転しながら非回転のオイルシール１０の第二の金属環１５と密接摺動されることによって、機外Ａからの泥水等の浸入を阻止するものであり、オイルシール１０の泥水受け１８は、対泥水シールリップ２１，２２の密封摺動部を万一通過した泥水を受け止め、泥水受け１８による円周溝１８ａに沿って流下させるものである。泥水受け１８に沿って流下した泥水は、回転する対泥水シールリップ２１に滴下してその遠心力によって振り切られ、外周側へ押し戻される。ダストリップ１４は、対泥水シールリップ２１の内周側で、回転軸３の外周面に摺動可能に密接されることによって、対油シールリップ１３側への泥水等の浸入を阻止するものである。   On the other hand, a labyrinth-shaped gap L is formed on the outer peripheral side of the anti-mud seal lips 21 and 22, so that muddy water flying from outside the machine A enters the sealing sliding portion by the anti-mud seal lips 21 and 22 The muddy water seal lips 21, 22 provided on the dust cover 20 are difficult to rotate, and the second metal of the non-rotating oil seal 10 while rotating together with the dust cover 20 rotated integrally with the rotating shaft 3. By being closely slid with the ring 15, the intrusion of muddy water and the like from outside the machine A is prevented. The muddy water that has passed once is received and allowed to flow down along the circumferential groove 18 a by the muddy water receiver 18. The muddy water flowing down along the muddy water receptacle 18 is dropped on the rotating muddy water seal lip 21 and shaken off by the centrifugal force, and pushed back to the outer peripheral side. The dust lip 14 is slidably in contact with the outer peripheral surface of the rotary shaft 3 on the inner peripheral side of the anti-muddy water seal lip 21 to prevent the intrusion of muddy water or the like into the anti-oil seal lip 13 side. is there.

そして上記構成によれば、対泥水シールリップ２１，２２が摺接されるオイルシール１０の第二の金属環１５は、固体潤滑材料をコーティングした金属板など、低摩擦材又は鏡面材からなるものであるため、複数（図示の例では２段）の対泥水シールリップ２１，２２を設けたにも拘らず、摺動トルクによるエネルギ損失の増大が抑制される。   And according to the said structure, the 2nd metal ring 15 of the oil seal 10 with which the anti-mud seal lips 21 and 22 are slidably contacted consists of a low friction material or a mirror surface material such as a metal plate coated with a solid lubricating material. Therefore, in spite of the provision of a plurality (two stages in the illustrated example) of the muddy water seal lips 21 and 22, an increase in energy loss due to the sliding torque is suppressed.

また、この形態では複数（図示の例では２段）の対泥水シールリップ２１，２２によって耐泥水性を確保しているため、これら対泥水シールリップ２１，２２には必ずしも耐泥水性に優れた材質は求められず、したがって対油シールリップ１３と同材質（例えばＡＣＭ）からなるものとすることができるが、耐泥水性に優れたＮＢＲなどを用いても良いことはもちろんである。   Moreover, in this embodiment, since the mud water resistance is secured by a plurality (two stages in the illustrated example) of the mud water seal lips 21, 22, the mud water seal lips 21, 22 are not necessarily excellent in mud water resistance. The material is not required, and therefore, it can be made of the same material (for example, ACM) as the oil seal lip 13, but it is needless to say that NBR having excellent mud water resistance may be used.

なお、オイルシール１０の第二の金属環１５は、上述のように金属板に固体潤滑材料をコーティングしたものである場合、摺動トルク低減のほか、防錆効果も奏するが、例えばＳＵＳ（ステンレス鋼）や、メッキ鋼板、アルミ系金属板などを用いることによって防錆を図ることもできる。   When the second metal ring 15 of the oil seal 10 is formed by coating a solid lubricating material on a metal plate as described above, it has a rust prevention effect in addition to reducing sliding torque. Steel), plated steel plate, aluminum metal plate, etc. can be used to prevent rust.

１ 密封装置
１０ オイルシール
１１ 第一の金属環
１２ 外周シール部
１３ 対油シールリップ
１４ ダストリップ
１５ 第二の金属環
２０ ダストカバー
２１，２２ 対泥水シールリップ
２ ハウジング（静止側）
３ 回転軸（回転側）
Ａ 機外
Ｂ 機内 DESCRIPTION OF SYMBOLS 1 Sealing device 10 Oil seal 11 1st metal ring 12 Perimeter seal part 13 Oil seal lip 14 Dustrip
15 Second metal ring
20 Dust cover 21, 22 Anti-muddy water seal lip 2 Housing (stationary side)
3 Rotating shaft (Rotating side)
A Outside the machine B Inside the machine

Claims (1)

第一の金属環に対油シールリップが一体に成形されると共に前記第一の金属環に機外側に面して第二の金属環が密接嵌合され静止側に取り付けられるオイルシールと、このオイルシールの機外側に位置して回転側に取り付けられるダストカバーと、前記ダストカバーに一体に成形されると共に前記第二の金属環のフランジ部に摺動可能に密接される内周側の対泥水シールリップと、前記ダストカバーに一体に成形されると共に前記第二の金属環の外周筒部の内周面に摺動可能に密接される外周側の対泥水シールリップと、を備え、前記ダストカバーに形成された外周筒部が前記オイルシールの第一の金属環に形成された外周筒部の外周側を包囲するように延び、前記第二の金属環が低摩擦材からなり、前記低摩擦材が、前記第一の金属環と反対側の面に固体潤滑材料が設けられた金属板及び前記第一の金属環と反対側の面に鏡面が形成された金属板のいずれかから選択されたものであり、前記第二の金属環の外周筒部が前記第一の金属環の外周筒部の内周面に一体的に嵌着されたことを特徴とする密封装置。 An oil seal lip is integrally formed on the first metal ring, and the oil seal is attached to the stationary side by closely fitting the second metal ring so as to face the outside of the first metal ring. A dust cover that is located on the outer side of the oil seal and is attached to the rotating side, and an inner peripheral pair that is integrally formed with the dust cover and that is slidably in close contact with the flange portion of the second metal ring A muddy water seal lip, and a muddy water seal lip on the outer peripheral side that is formed integrally with the dust cover and is slidably in contact with the inner peripheral surface of the outer peripheral cylindrical portion of the second metal ring, and extends as the outer peripheral tube portion formed in the dust cover encloses the outer periphery of the outer tube portion formed in the first metal ring of the oil seal, the second metal ring is made of a low friction material, the The low friction material is opposite to the first metal ring. Has been selected from one of the metal plate on the surface side solid lubricant material is provided and said first metal ring opposite the metal plate reflection plane on the surface is formed of the second metal ring The outer peripheral cylindrical part is integrally fitted on the inner peripheral surface of the outer peripheral cylindrical part of the first metal ring.
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WO2016111129A1 (en) * 2015-01-07 2016-07-14 Nok株式会社 Sealing structure using torsional damper and oil seal
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KR102065154B1 (en) * 2017-10-23 2020-02-11 현대위아 주식회사 Power transfer unit having dust preventing structure
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