JP2011256913A - Pulsation damper for clutch operating device - Google Patents

Pulsation damper for clutch operating device Download PDF

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JP2011256913A
JP2011256913A JP2010130617A JP2010130617A JP2011256913A JP 2011256913 A JP2011256913 A JP 2011256913A JP 2010130617 A JP2010130617 A JP 2010130617A JP 2010130617 A JP2010130617 A JP 2010130617A JP 2011256913 A JP2011256913 A JP 2011256913A
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diaphragm
annular seal
seal groove
damper
groove
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JP5612910B2 (en
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Takeshi Sakai
剛 酒井
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Nissin Kogyo Co Ltd
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Nissin Kogyo Co Ltd
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  • Diaphragms And Bellows (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Gasket Seals (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a pulsation damper for a clutch operating device capable of securing sealability, following the bending of a diaphragm.SOLUTION: An annular seal member 8 sealing the diaphragm 7 includes: a base 8a disposed at an outer circumferential wall side of an annular seal groove 3b; a diaphragm-side lip 8b extended toward an inner circumferential wall side of the annular seal groove 3b from an inner circumferential diaphragm side of the base 8a and gradually inclined to the diaphragm side toward the top end side; and a groove bottom-side lip 8c extended toward the inner circumferential wall side of the annular seal groove 3b from an inner circumferential groove bottom side of the base 8a and gradually inclined to a bottom wall side of the annular seal groove 3b toward the top end side.

Description

本発明は、クラッチ操作装置のスレーブシリンダとマスタシリンダとの間の液通路に配置され、該液通路に伝達される脈動を吸収する脈動ダンパに関し、詳しくは、脈動ダンパのダイヤフラムをシールする環状シール部材の構造に関する。   The present invention relates to a pulsation damper that is disposed in a liquid passage between a slave cylinder and a master cylinder of a clutch operating device and absorbs a pulsation transmitted to the liquid passage, and more particularly, an annular seal that seals a diaphragm of the pulsation damper. It relates to the structure of the member.

従来、クラッチ操作装置の脈動ダンパとして、スレーブシリンダに連通する液通路と前記マスタシリンダに連通する液通路とを備えた減衰油室を内部に有するダンパ本体と、該ダンパ本体の開口部に接合されるカバー体と、該カバー体と前記ダンパ本体との間に配置され、前記減衰油室を覆うダイヤフラムとを備え、前記ダンパ本体に形成した環状シール溝に、ダイヤフラムに当接してダイヤフラムをシールする環状シール部材が装着されているものがあった。この環状シール部材は、ダイヤフラムの撓みにより、ダイヤフラムとの間に空隙が発生したり、ダイヤフラムが撓んだ際に、ダイヤフラムとダンパ本体との間に形成される空隙にシール部材の一部が食い込むことがないように、ダイヤフラムに圧接する内外一対の環状のリップ部を設けると共に、各リップ部の外周面を先端に向かって縮径するテーパ状に形成されていた（例えば、特許文献１参照。）。   Conventionally, as a pulsation damper for a clutch operating device, a damper body having a damping oil chamber having a fluid passage communicating with a slave cylinder and a fluid passage communicating with the master cylinder is joined to an opening of the damper body. And a diaphragm disposed between the cover body and the damper main body and covering the damping oil chamber, and an annular seal groove formed in the damper main body abuts on the diaphragm to seal the diaphragm. Some were equipped with an annular seal member. In this annular seal member, when the diaphragm is bent, a gap is generated between the diaphragm and the diaphragm, and when the diaphragm is bent, a part of the seal member bites into the gap formed between the diaphragm and the damper main body. In order to prevent this, a pair of inner and outer annular lip portions that are in pressure contact with the diaphragm are provided, and the outer peripheral surface of each lip portion is formed in a tapered shape that decreases in diameter toward the tip (see, for example, Patent Document 1). ).

実開平５−７９０６３号公報Japanese Utility Model Publication No. 5-79063

しかし、上述のものでは、ダイヤフラムが反減衰油室側に撓んだ際に、リップ部をダイヤフラムの撓みに確実に追従させることができないことがあった。   However, in the above-described case, when the diaphragm is bent toward the anti-damping oil chamber, the lip portion may not be able to reliably follow the bending of the diaphragm.

そこで本発明は、ダイヤフラムの撓みに追従して、シール性を確保することができるクラッチ操作装置の脈動ダンパを提供することを目的としている。   Accordingly, an object of the present invention is to provide a pulsation damper for a clutch operating device that can ensure the sealing performance by following the bending of a diaphragm.

上記目的を達成するため、本発明のクラッチ操作装置の脈動ダンパは、開口部を有するダンパ本体に、該ダンパ本体に接合されて前記開口部を閉塞するダイヤフラムを備え、該ダイヤフラムの前記ダンパ本体側にスレーブシリンダとマスタシリンダとの間の液通路に連通する減衰油室を画成するとともに、前記ダンパ本体の前記ダイヤフラムの外周部に対向するダイヤフラム対向面にダイヤフラム側が開口した環状シール溝を形成し、該環状シール溝に前記ダイヤフラムに当接する環状シール部材を嵌着したクラッチ操作装置の脈動ダンパにおいて、前記環状シール部材は、前記環状シール溝の外周壁側に配置される基部と、該基部の内周面ダイヤフラム側から前記環状シール溝の内周壁側に向けて延設されると共に、先端側に向けて漸次ダイヤフラム側に傾斜するダイヤフラム側リップ部と、前記基部の内周面溝底部側から前記環状シール溝の内周壁側に向けて延設されると共に、先端側に向けて漸次環状シール溝の底壁側に傾斜する溝底部側リップ部とを備えていることを特徴としている。   In order to achieve the above object, a pulsation damper of a clutch operating device of the present invention comprises a damper main body having an opening, and a diaphragm joined to the damper main body to close the opening, and the damper main body side of the diaphragm In addition, a damping oil chamber communicating with a liquid passage between the slave cylinder and the master cylinder is defined, and an annular seal groove having an opening on the diaphragm side is formed on a diaphragm facing surface of the damper body facing the outer periphery of the diaphragm. In the pulsation damper of the clutch operating device in which the annular seal member that contacts the diaphragm is fitted in the annular seal groove, the annular seal member includes a base portion disposed on the outer peripheral wall side of the annular seal groove, It extends from the inner peripheral diaphragm side toward the inner peripheral wall side of the annular seal groove and gradually decreases toward the tip side. A diaphragm side lip portion inclined toward the diaphragm side, and extending from the inner peripheral surface groove bottom side of the base portion toward the inner peripheral wall side of the annular seal groove, and gradually toward the distal end side of the bottom wall of the annular seal groove And a groove bottom side lip portion inclined to the side.

また、前記環状シール部材は、前記基部の外周面に、前記環状シール溝の外周壁に当接する突部が形成されていても良い。さらに、前記環状シール部材は、前記基部の厚さ方向の中心線に対して、前記ダイヤフラム側と前記環状シール溝の底壁側とが対称形状に形成されると好適である。   Further, the annular seal member may be formed with a protrusion that contacts the outer peripheral wall of the annular seal groove on the outer peripheral surface of the base. In the annular seal member, it is preferable that the diaphragm side and the bottom wall side of the annular seal groove are formed symmetrically with respect to the center line in the thickness direction of the base portion.

本発明のクラッチ操作装置の脈動ダンパによれば、環状シール部材は、ダイヤフラムが反減衰油室側に撓む際に、ダイヤフラム側リップ部がダイヤフラム側に拡開することにより、ダイヤフラムの撓みに良好に追従し、シール性を確保することができる。   According to the pulsation damper of the clutch operating device of the present invention, when the diaphragm is bent toward the anti-damping oil chamber side, the diaphragm side lip portion is expanded toward the diaphragm side, so that the diaphragm seal is good for bending of the diaphragm. The sealing performance can be secured.

また、環状シール部材は、基部の外周面に、前記環状シール溝の外周壁に当接する突部が形成されることにより、該突部によってリップ部が変形しても環状シール部材の倒れを防止でき、シール性を確保することができ、また、ダイヤフラムが撓む際に、基部がダイヤフラムと、ダンパ本体との間に食い込むことを防止できる。   In addition, the annular seal member is formed with a protrusion on the outer peripheral surface of the base that contacts the outer peripheral wall of the annular seal groove, so that the annular seal member is prevented from falling even if the lip is deformed by the protrusion. The sealing performance can be ensured, and when the diaphragm is bent, the base portion can be prevented from biting between the diaphragm and the damper main body.

さらに、環状シール部材は、基部の厚さ方向の中心線に対して、前記ダイヤフラム側と前記環状シール溝の底壁側とが対称形状に形成されることから、環状シール部材の組み付けが容易である。   Further, since the diaphragm side and the bottom wall side of the annular seal groove are formed symmetrically with respect to the center line in the thickness direction of the base portion, the annular seal member can be easily assembled. is there.

図５のI-I断面図である。It is II sectional drawing of FIG. 本発明の一形態例を示す脈動ダンパの要部断面図である。It is principal part sectional drawing of the pulsation damper which shows one example of this invention. 同じくダイヤフラムが撓んだ際の脈動ダンパの要部断面図である。It is a principal part sectional view of a pulsation damper when a diaphragm is bent similarly. 同じく環状シール溝の断面斜視図である。It is a cross-sectional perspective view of an annular seal groove. 本発明の一形態例を示す脈動ダンパの平面図である。It is a top view of the pulsation damper which shows one form of the present invention.

図１乃至図５は本発明のクラッチ操作装置の脈動ダンパの一形態例を示す図で、クラッチ操作装置の脈動ダンパ１は、マスタシリンダ２の上部に一体に設けられ、上部開口部３ａを備えたダンパ本体３と、該ダンパ本体３の上部にＯリング４を介してビス５にて接合され、上部開口部３ａを閉塞するカバー体６と、カバー体６とダンパ本体３との間に配置されるダイヤフラム７とを備え、該ダイヤフラム７をシールする環状シール部材８とを備えている。   FIG. 1 to FIG. 5 are views showing an example of a pulsation damper of the clutch operating device of the present invention. The pulsating damper 1 of the clutch operating device is integrally provided on the upper part of the master cylinder 2 and includes an upper opening 3a. A damper body 3, a cover body 6 joined to the upper portion of the damper body 3 via an O-ring 4 with a screw 5 and closing the upper opening 3 a, and disposed between the cover body 6 and the damper body 3. And an annular seal member 8 for sealing the diaphragm 7.

ダンパ本体３は、内部に、前記上部開口部３ａよりも小さい開口部９ａを備えた凹状の減衰油室９と、スレーブシリンダ（図示せず）と減衰油室９とを連通する第１液通路１０と、マスタシリンダ２と減衰油室９とを連通する第２液通路１１とを備えると共に、ダンパ本体３の、ダイヤフラム７の外周部に対向するダイヤフラム対向面には、ダイヤフラム側が開口した環状シール溝３ｂが形成され、該環状シール溝３ｂに前記環状シール部材８が嵌着される。また、環状シール溝３ｂと、該環状シール溝３ｂの上部外周側に連続して形成される上部開口部３ａとの間に形成される段部３ｃには、前記ダイヤフラム７が配置される。さらに、ダンパ本体３のカバー体６と対向する上面には、Ｏリング装着溝３ｄが形成され、該Ｏリング装着溝３ｄに前記Ｏリング４が嵌着されている。   The damper main body 3 includes a first damping passage that communicates a concave damping oil chamber 9 having an opening 9 a smaller than the upper opening 3 a, a slave cylinder (not shown), and the damping oil chamber 9. 10 and a second liquid passage 11 communicating with the master cylinder 2 and the damping oil chamber 9, and an annular seal having an opening on the diaphragm side on the diaphragm facing surface of the damper body 3 facing the outer peripheral portion of the diaphragm 7. A groove 3b is formed, and the annular seal member 8 is fitted into the annular seal groove 3b. Further, the diaphragm 7 is disposed in a step portion 3c formed between the annular seal groove 3b and the upper opening 3a formed continuously on the upper outer peripheral side of the annular seal groove 3b. Furthermore, an O-ring mounting groove 3d is formed on the upper surface of the damper main body 3 facing the cover body 6, and the O-ring 4 is fitted into the O-ring mounting groove 3d.

環状シール部材８は、環状シール溝３ｂの外周壁側に配置される基部８ａと、該基部８ａの内周面上部（ダイヤフラム側）から環状シール溝３ｂの内周壁側に向けて延設されると共に、先端側に向けて漸次ダイヤフラム側に傾斜するダイヤフラム側リップ部８ｂと、基部８ａの内周面下部（溝底部側）から環状シール溝３ｂの内周壁側に向けて延設されると共に、先端側に向けて漸次環状シール溝３ｂの底壁側に傾斜する溝底部側リップ部８ｃとを備え、前記基部８ａの外周面の上部と下部とには、環状シール溝３ｂの外周壁３ｅに当接する突部８ｄ，８ｄが形成されている。また、環状シール部材８の形状は、基部８ａの厚さ方向の中心線ＣＬ１に対して、ダイヤフラム側と溝底部側とが対称形状に形成されている。   The annular seal member 8 is extended from the base portion 8a disposed on the outer peripheral wall side of the annular seal groove 3b and the inner peripheral surface upper portion (diaphragm side) of the base portion 8a toward the inner peripheral wall side of the annular seal groove 3b. Along with the diaphragm side lip portion 8b, which is gradually inclined toward the diaphragm side toward the tip side, and extended from the lower portion of the inner peripheral surface (groove bottom portion side) of the base portion 8a toward the inner peripheral wall side of the annular seal groove 3b, A groove bottom side lip portion 8c which is gradually inclined toward the bottom wall side of the annular seal groove 3b toward the distal end side is provided on the outer peripheral wall 3e of the annular seal groove 3b at the upper and lower portions of the outer peripheral surface of the base portion 8a. Projecting portions 8d, 8d that abut are formed. The annular seal member 8 is formed such that the diaphragm side and the groove bottom side are symmetrical with respect to the center line CL1 in the thickness direction of the base portion 8a.

ダイヤフラム７は、金属や樹脂等の可撓性材料で形成される周知のもので、円盤状に形成され、外周側がダンパ本体３に形成した段部３ｃに載置され、段部３ｃに載置されたダイヤフラム７の上面には、リング状のダイヤフラム押え部材１２が載置されている。   The diaphragm 7 is a well-known diaphragm formed of a flexible material such as metal or resin. The diaphragm 7 is formed in a disk shape, and the outer peripheral side is placed on the stepped portion 3c formed on the damper main body 3, and is placed on the stepped portion 3c. On the upper surface of the diaphragm 7, a ring-shaped diaphragm pressing member 12 is placed.

ダンパ本体３は、環状シール溝３ｂに環状シール部材８を、Ｏリング装着溝３ｄにＯリング４をそれぞれ装着し、段部３ｃにダイヤフラム７を載置すると共に該ダイヤフラム７の上面にダイヤフラム押え部材１２を載置した状態で、その上部にカバー体６が３本のビス５にて接合されることにより、ダイヤフラム７よりも下方に減衰油室９が、ダイヤフラム７よりも上方に空気室１３がそれぞれ画成される。このように組み付けられた脈動ダンパ１では、図２に示すように、環状シール部材８はダイヤフラム７及びダイヤフラム押え部材１２により、ダイヤフラム側リップ部８ｂと溝底部側リップ部８ｃとが互いに近付く方向に圧縮された状態となり、ダイヤフラム側リップ部８ｂの上面がダイヤフラム７の下面に密着している。   In the damper main body 3, the annular seal member 8 is mounted in the annular seal groove 3b, the O-ring 4 is mounted in the O-ring mounting groove 3d, the diaphragm 7 is placed on the stepped portion 3c, and the diaphragm pressing member is placed on the upper surface of the diaphragm 7 In the state where 12 is placed, the cover body 6 is joined to the upper part by three screws 5, so that the damping oil chamber 9 is located below the diaphragm 7 and the air chamber 13 is located above the diaphragm 7. Each is defined. In the pulsation damper 1 assembled in this way, as shown in FIG. 2, the annular seal member 8 is moved in such a direction that the diaphragm side lip portion 8b and the groove bottom side lip portion 8c approach each other by the diaphragm 7 and the diaphragm pressing member 12. In a compressed state, the upper surface of the diaphragm side lip portion 8 b is in close contact with the lower surface of the diaphragm 7.

また、マスタシリンダによりスレーブシリンダを作動してクラッチをオフ状態に保持している間、エンジンの回転振動に起因して、第１液通路１０に脈動が生じると、この脈動が減衰油室９に伝達され、減衰油室９に伝達された脈動は、ダイヤフラム７が撓むことにより吸収される。これにより、第２液通路１１に脈動が伝達されることを防止でき、第２液通路１１からマスタシリンダ２に脈動を伝えない。環状シール部材８は、図３に示すように、ダイヤフラム７がカバー体６側（反減衰油室側）に撓んだ際には、ダイヤフラム側リップ部８ｂが先端側に向けて漸次ダイヤフラム側に傾斜していることにより、ダイヤフラム側に拡開することから、ダイヤフラム７の撓みに良好に追従し、シール性を確保することができる。また、環状シール部材８は、基部８ａの外周面に設けた突部８ｄ，８ｄを環状シール溝３ｂの外周壁３ｅに当接させて装着されていることから、ダイヤフラム側リップ部８ｂが変形しても、環状シール部材８が倒れることを防止できると共に、ダイヤフラム７が撓む際に、基部８ａの上面がダイヤフラム７と段部３ｃとの間に食い込むことを防止できる。さらに、環状シール部材８は、基部８ａの厚さ方向の中心線ＣＬに対して、ダイヤフラム側と環状シール溝３ｂの底壁側とが対称形状に形成されることから、誤組み付けを防止できると共に、組み付けが容易になる。   Further, when the slave cylinder is operated by the master cylinder and the clutch is held in the OFF state, if pulsation occurs in the first fluid passage 10 due to rotational vibration of the engine, the pulsation is caused in the damping oil chamber 9. The pulsation transmitted and transmitted to the damping oil chamber 9 is absorbed when the diaphragm 7 is bent. Thereby, it is possible to prevent pulsation from being transmitted to the second liquid passage 11, and no pulsation is transmitted from the second liquid passage 11 to the master cylinder 2. As shown in FIG. 3, when the diaphragm 7 is bent toward the cover body 6 side (anti-attenuation oil chamber side), the annular seal member 8 gradually moves toward the diaphragm side with the diaphragm side lip portion 8b toward the tip side. By inclining, since it expands to the diaphragm side, it can follow the bending of the diaphragm 7 well, and can ensure sealing performance. Further, since the annular seal member 8 is mounted with the protrusions 8d and 8d provided on the outer peripheral surface of the base portion 8a in contact with the outer peripheral wall 3e of the annular seal groove 3b, the diaphragm side lip portion 8b is deformed. However, it is possible to prevent the annular seal member 8 from falling down and to prevent the upper surface of the base portion 8a from biting between the diaphragm 7 and the step portion 3c when the diaphragm 7 is bent. Further, the annular seal member 8 is formed in a symmetrical shape on the diaphragm side and the bottom wall side of the annular seal groove 3b with respect to the center line CL in the thickness direction of the base portion 8a. Assembling becomes easy.

尚、本発明の脈動ダンパは、上述の形態例に限らず、ダンパ本体の開口部や減衰油室の開口部が、下方や側方に向くように配置されるものでも差し支えなく、また、マスタシリンダの上部に一体に形成されるものに限らず、別体に形成することもできる。   The pulsation damper according to the present invention is not limited to the above-described embodiment, and the damper body and the damping oil chamber may be arranged so that the opening of the damper body and the opening of the damping oil chamber face downward or sideward. It is not limited to being integrally formed on the upper part of the cylinder, but may be formed separately.

１…脈動ダンパ、２…マスタシリンダ、３…ダンパ本体、３ａ…上部開口部、３ｂ…環状シール溝、３ｃ…段部、３ｄ…Ｏリング装着溝、３ｅ…外周壁、４…Ｏリング、５…ビス、６…カバー体、７…ダイヤフラム、８…環状シール部材、８ａ…基部、８ｂ…ダイヤフラム側リップ部、８ｃ…溝底部側リップ部、８ｄ…突部、９…減衰油室、９ａ…開口部、１０…第１液通路、１１…第２液通路、１２…ダイヤフラム押え部材、１３…空気室   DESCRIPTION OF SYMBOLS 1 ... Pulsation damper, 2 ... Master cylinder, 3 ... Damper main body, 3a ... Upper opening part, 3b ... Annular seal groove, 3c ... Step part, 3d ... O-ring installation groove, 3e ... Outer wall, 4 ... O-ring, 5 ... screw, 6 ... cover body, 7 ... diaphragm, 8 ... annular seal member, 8a ... base, 8b ... diaphragm side lip, 8c ... groove bottom side lip, 8d ... projection, 9 ... damping oil chamber, 9a ... Opening portion, 10 ... first liquid passage, 11 ... second liquid passage, 12 ... diaphragm pressing member, 13 ... air chamber

Claims (3)

開口部を有するダンパ本体に、該ダンパ本体に接合されて前記開口部を閉塞するダイヤフラムを備え、該ダイヤフラムの前記ダンパ本体側にスレーブシリンダとマスタシリンダとの間の液通路に連通する減衰油室を画成するとともに、前記ダンパ本体の前記ダイヤフラムの外周部に対向するダイヤフラム対向面にダイヤフラム側が開口した環状シール溝を形成し、該環状シール溝に前記ダイヤフラムに当接する環状シール部材を嵌着したクラッチ操作装置の脈動ダンパにおいて、前記環状シール部材は、前記環状シール溝の外周壁側に配置される基部と、該基部の内周面ダイヤフラム側から前記環状シール溝の内周壁側に向けて延設されると共に、先端側に向けて漸次ダイヤフラム側に傾斜するダイヤフラム側リップ部と、前記基部の内周面溝底部側から前記環状シール溝の内周壁側に向けて延設されると共に、先端側に向けて漸次環状シール溝の底壁側に傾斜する溝底部側リップ部とを備えていることを特徴とするクラッチ操作装置の脈動ダンパ。 A damper main body having an opening includes a diaphragm joined to the damper main body to close the opening, and a damping oil chamber communicating with a liquid passage between a slave cylinder and a master cylinder on the damper main body side of the diaphragm An annular seal groove having an opening on the diaphragm side is formed on the diaphragm facing surface of the damper main body facing the outer peripheral portion of the diaphragm, and an annular seal member that contacts the diaphragm is fitted into the annular seal groove. In the pulsation damper of the clutch operating device, the annular seal member extends from the inner peripheral surface diaphragm side of the annular seal groove toward the inner peripheral wall side of the annular seal groove. A diaphragm-side lip portion that is gradually inclined toward the diaphragm side toward the distal end side, and an inner peripheral surface of the base portion A groove bottom side lip portion that extends from the bottom side toward the inner peripheral wall side of the annular seal groove and that gradually inclines toward the bottom wall side of the annular seal groove toward the tip side. The pulsation damper of the clutch operating device. 前記環状シール部材は、前記基部の外周面に、前記環状シール溝の外周壁に当接する突部が形成されていることを特徴とする請求項１記載の脈動ダンパ。 2. The pulsation damper according to claim 1, wherein the annular seal member has a protrusion formed on the outer peripheral surface of the base portion that abuts against the outer peripheral wall of the annular seal groove. 前記環状シール部材は、前記基部の厚さ方向の中心線に対して、ダイヤフラム側と溝底部側とが対称形状に形成されていることを特徴とする請求項１又は２記載のクラッチ操作装置の脈動ダンパ。 3. The clutch operating device according to claim 1, wherein the annular seal member is formed so that a diaphragm side and a groove bottom side are symmetrical with respect to a center line in a thickness direction of the base portion. Pulsation damper.
JP2010130617A 2010-06-08 2010-06-08 Pulsation damper of clutch operating device Expired - Fee Related JP5612910B2 (en)

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Cited By (1)

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CN111727544A (en) * 2018-02-15 2020-09-29 松下知识产权经营株式会社 Motor and electric apparatus including the same

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JPH023069U (en) * 1988-06-17 1990-01-10
JPH02138574A (en) * 1988-11-18 1990-05-28 Hitachi Ltd Gasket
JPH08109902A (en) * 1994-10-13 1996-04-30 Nabco Ltd Pulsation pressure absorbing device
JP2005036926A (en) * 2003-07-17 2005-02-10 Zeni Lite Buoy Co Ltd Gasket for water sealed container
JP2008032112A (en) * 2006-07-28 2008-02-14 Aisin Seiki Co Ltd Seal and hydraulic clutch release device
JP2008128282A (en) * 2006-11-17 2008-06-05 Jatco Ltd Lip seal

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JPH023069U (en) * 1988-06-17 1990-01-10
JPH02138574A (en) * 1988-11-18 1990-05-28 Hitachi Ltd Gasket
JPH08109902A (en) * 1994-10-13 1996-04-30 Nabco Ltd Pulsation pressure absorbing device
JP2005036926A (en) * 2003-07-17 2005-02-10 Zeni Lite Buoy Co Ltd Gasket for water sealed container
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JP2008128282A (en) * 2006-11-17 2008-06-05 Jatco Ltd Lip seal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111727544A (en) * 2018-02-15 2020-09-29 松下知识产权经营株式会社 Motor and electric apparatus including the same
EP3754816A4 (en) * 2018-02-15 2021-03-24 Panasonic Intellectual Property Management Co., Ltd. Motor and electric device with same

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