EP0090105B1 - Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne - Google Patents

Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne Download PDF

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Publication number
EP0090105B1
EP0090105B1 EP82301647A EP82301647A EP0090105B1 EP 0090105 B1 EP0090105 B1 EP 0090105B1 EP 82301647 A EP82301647 A EP 82301647A EP 82301647 A EP82301647 A EP 82301647A EP 0090105 B1 EP0090105 B1 EP 0090105B1
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EP
European Patent Office
Prior art keywords
valve
spring retainer
adjustor
valve spring
cap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82301647A
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German (de)
English (en)
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EP0090105A1 (fr
Inventor
Alfred Anthony Black
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP88121323A priority Critical patent/EP0375792B1/fr
Priority to EP82301647A priority patent/EP0090105B1/fr
Priority to DE8282301647T priority patent/DE3280067D1/de
Publication of EP0090105A1 publication Critical patent/EP0090105A1/fr
Application granted granted Critical
Publication of EP0090105B1 publication Critical patent/EP0090105B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem

Definitions

  • This invention relates to valve adjustment means for internal combustion engines having overhead cams or rocker arms and more particularly relates to a valve spring retainer including means for adjustment of the gap between the cam shaft and/or rocker arm and valve stem.
  • valves In typical overhead cam engines the valves are operated by a rocker arm pushing on the valve stem or cam shaft pushing on bucket tappets.
  • the rocket arm is usually actuated by a cam located in association therewith.
  • gaps are usually provided between the valve stem and rocker arm. Most adjustments of the gap mentioned above are accomplished by means of a locked screw or the use of shims placed within the bucket member positioned over the valve spring retainer. Althgugh such adjustments are relatively simple, in many instances one must remove the cam shaft from the vehicle in order to place the shims in position under the bucket.
  • the bucket may be adjusted by providing a tapered screw member threaded across the top of the valve stem at an angle so that if it is rotated upward it raises the bucket or if it is rotated downward it lower the bucket.
  • a gap adjustment device that is pertinent to the device of this invention is disclosed in U.S. Patent No. 2,722,204, issued to Adolph Wente entitled “Means for Adjusting the Lost Motion of the Valve Actuation in Internal Combustion Engines.”
  • This system provides adjusting means that utilize a threaded valve stem on which a nut-like member is rotatably threaded. Systems such as this must provide means to prevent rotation of the valve stem when the nut is rotated thereon or adjustment.
  • US Patent No. US-1857005 discloses a mechanically adjustable valve mechanism for an I.C. engine
  • Swiss Patent No. CH-A-322762 discloses an hydraulic arrangement. Neither of these last two disclosures is considered to provide a wholly appropriate adjustment solution.
  • It is desirable to provide a device for the adjustment of the gap between a valve stem and rocker arm wnich is substantially lighter in weight to that used in the present art, which is significantly less bulky, which replaces three to four elements now utilized to accomplish the same adjustment, and which removes the point of direct actuation of the valve stem from its top thereby lessening the stress on such stem and allowing it to be lighter in weight. It is also desirable that the valve spring's resistance to compression not be transferred directly to the top of the valve stem as present done in the prior art.
  • an adjustor for the adjustment of the thermal expansion gap between a valve stem and its operation means within an internal combustion engine having a valve spring retainer member with a valve stem receipt aperture therein at one end, said valve spring retainer member being removably retained upon said valve stem by a keeper key, characterised by a cap member located to the other end of said valve spring retainer member and adjustably connected thereto, and means to permit an adjustment of either (a) a first gap between said cap member and said operation means and, as a result, corresponding inverse adjustment of a second gap between said cap member and said valve stem, or (b) said second gap and, as a result, corresponding inverse adjustment of said first gap, said adjustment means including means to raise or lower said cap member in relation to said valve spring retainer member said cap member being arranged neither to be directly attached to said valve stem in normal operation nor to have direct contact with said valve stem.
  • the device comprises a valve spring retainer base which is adapted to fit over the valve spring and has an aperture through a central portion thereof for receipt of the valve stem, and lip means for the engagement of an outer and inner valve spring if such is used in the engine.
  • the valve spring retainer base further has a central portion threaded on its inside and an upwardly extending outer portion threaded along its inside.
  • the outer valve spring lip member located below the outer threaded portion of the valve spring retainer base projects downward to fit over, engage, and retain the valve's outer spring.
  • a lock bolt receipt aperture whose function will be described below.
  • a valve adjustor cap is also provided having on its bottom a central projection with threads upon the outer portion thereof adapted to be threadedly engaged into the inner threaded portion of the valve spring retainer base.
  • the valve adjustor cap has along its outer periphery a threaded portion adapted to engage into the outer threaded portion of the valve spring retainer base.
  • the top of the valve adjustor cap has a section thereon which is polygonal, e.g., hexagonal, and is adapted to be engaged for the rotation by a wrench above the valve spring retainer base.
  • a lock bolt is provided along with a cap lock member having an aperture therein through which the lock bolt may pass.
  • the cap lock member has a lip member adapted to engage into a selected one of a plurality of apertures disposed around the periphery of the valve adjustor cap so that when the valve adjustor cap is rotated within the valve spring retainer base to its desired height for the adjustment of the gap between the valve stem and the rocker arm, it may be locked into position by the placement of the cap lock member with the lip or lips thereof engaged into the nearest of the apertures within the valve adjustor cap.
  • the lock bolt is then passed through the aperture within the cap lock member and passed into the lock bolt receipt aperture in the valve spring retainer base and is affixed into position by a nut threaded on its extending portion.
  • valve stem spring member which fits therein and a valve stem bushing.
  • the valve stem bushing has a projection upon one side thereof which engages the valve stem spring member.
  • the valve stem bushing is adapted to fit into the valve stem bushing receipt area defined within the valve spring retainer base.
  • the valve stem receipt aperture defined in the valve spring retainer base is constructed somewhat more narrowly at its base then at its top.
  • valve stem When the valve stem is positioned therein, a valve keeper key is placed within a groove in the top of the valve stem which is then adapted to move freely in the top of the valve stem receipt aperture but not pass downward out of the valve stem receipt aperture due to the fact that the base of the valve stem receipt aperture is narrower than the valve keeper key positioned on the valve stem.
  • this key When positioned on the valve stem, this key retains the structure of this embodiment in place on top of the valve stem, and the valve spring is compressed keeping the valve in an upward position closing its associated port.
  • valve adjustor cap supported at both its center and its periphery rather than merely at one or the other position to prevent deformation at its centre and to help distribute the force load more evenly over the top surface of the valve adjustor cap. It is possible that in the operation of this device, the valve stem can rotate to various positions during use which rotation assists in the distribution of the wear on the valve's head/seat interface. To prevent any difficulty in threading the valve adjustor cap into the valve spring retainer base due to unmatched threads between the inner and outer threads, one may in an additional embodiment have the valve adjustor cap constructed of two pieces, one being the outer threaded ring with a lip for the support of the outer portion of the inner cap.
  • This outer threaded ring can have a plurality of projections extending from its top so that when the cap is threaded into the central thread of the valve adjustor base, these projections can be grasped by a tool and the outer threaded ring rotated to raise its lip to support the periphery of the valve cap.
  • the valve adjustor cap may also have an insert aperture defined therein to receive a polygonal hardened insert if the valve cap and valve spring retainer base are to be constructed of aluminium or other light material which might wear too easily from the action of the rocker arm or cam.
  • the spring-loaded bushing is provided to help keep the valve in place when the device of this embodiment is depressed. It further assures that the valve stem will move downward at the same time or at an extremely short time after the device of this embodiment has started its downward movement. It still further allows for the possibility of expansion of the valve stem therein especially when the retainer adjustor is adjusted for a zero gap. Further, it helps eliminate a certain amount of the noise caused by the valve stem striking directly against the valve adjustor cap. It also keeps pressure on the valve stem even when the device of this embodiment is depressed to prevent or minimize any upward movement of the valve stem on its own as the depressing force of the valve cap is not focused directly upon the stem of the valve but it is on the valve spring.
  • a circlip may be used in place of this spring if the expansion gap is made between the cap and its operation means.
  • valve spring retainer base there may be provided one or more holes drilled within the valve spring retainer base as well as the cap that would allow oil to circulate within the chamber formed between the valve spring retainer base and the valve adjustor cap.
  • the oil circulating through these holes will provide lubrication within the chamber and will also assist in decreasing noise by filling the relatively open chamber in which there might tend to be certain resonances.
  • This embodiment will also assist in keeping the valve spring retainer base and valve adjustor cap cooler so that heat from cam friction and heat transferred from the valve head through the valve stem to this embodiment would not cause significant expansion thereof.
  • a valve spring retainer base 10 has on its bottom portion a protruding outer valve spring retaining lip 12 into which is engaged outer valve spring 20. Also seen in this view are inner valve spring lip 14 into which is engaged inner valve spring 18, and valve stem receipt aperture 16 into which the valve stem passes. Aperture 16 is somewhat narrower at its base than at its top and acts to engage the valve stem due to a keeper key inserted into a groove at the top of the valve stem. Seen in a central portion of the valve spring retainer retainer base 10 is valve stem bushing receipt ledge 52. Projection 21 is centrally positioned above the valve stem receipt aperture and has a threaded portion 22 along its insides.
  • Valve spring retainer base 10 has an upwardly extending portion 23 along its periphery having along the inside thereof an inner threaded portion 24.
  • valve adjustor cap 26 Seen threaded into valve spring retainer base 10 is valve adjustor cap 26 which has positioned on its top a hexagonal member 32 for easy rotation thereof as mentioned below in relation to the valve spring retainer base 10.
  • hexagonal member 32 may be constructed as an insert into a cap receipt aperture 33.
  • a central portion 27 of the valve adjustor cap 26 protrudes downward and is externally threaded to engage the central threaded portion 22 of the valve spring retainer base 10.
  • the outer portions 30 of valve adjustor cap 26 can also be threaded to engage into, and adjust in an upward and downward fashion as it is rotated within, the valve spring retainer base 10.
  • the valve adjustor cap can be constructed having a separate outer threaded ring portion 35 having a lip 37 adapted so that the valve adjustor cap may be supported by the lip around the cap's periphery.
  • a plurality of adjustment projections 39 extend from the threaded ring portion so that when the cap is centrally threaded, the threaded ring portion 35 can be backed up to it by grasping and rotating such adjustment projections by a tool designed to engage them.
  • a lock bolt receipt aperture 34 defined within the valve spring retainer base 10.
  • the cap lock member is positioned within selected ones of the plurality of cap lock member holes 40 seen within the valve adjustor cap.
  • a valve stem bushing 36 is provided and adapted to rest upon its ledge 52 within the valve spring retainer base, and a spring member 45 is provided to engage both a protruding portion 47 of the valve stem bushing 46 and a projection 42 thereabove on the valve adjustor cap to keep pressure on the valve stem as described above.
  • a plurality of apertures 50 may be provided within the valve spring retainer base and adjustor cap member to allow for the flow of oil therethrough.
  • Figure 2 illustrates another alternate embodiment of the device of this invention having the cap member 26 constructed of a solid piece.
  • the valve spring retainer base can be constructed of aluminium or other light weight material and the cap member may be made of the same material or of a harder steel-like material as mentioned above to resist wear.
  • Figure 3 illustrates a further alternate embodiment having a cap member with a round top 300 having apertures 302 defined therein for receipt of projections on a tool for the rotation thereof.
  • a cap member with a round top 300 having apertures 302 defined therein for receipt of projections on a tool for the rotation thereof.
  • the central portion 304 of the engagement between the cap and the valve spring retainer base is threaded and there are no threads or other engagement means at the peripheral areas 306.
  • Figure 4 illustrates still yet another embodiment having the cap member only peripherally threaded. This embodiment is especially useful for smaller retainer members.
  • the cross-section view of Fig. 4 illustrates the tapered form of the valve stem receipt aperture or bore which accommodates the above-mentioned keeper key that is inserted into a groove at the top of the valve stem.
  • this tapered form of the valve stem receipt aperture or bore has been shown as a simple cylinder in Figs 1, 2 and 3 although in reality it conforms to the tapered shape of Fig 4.
  • valve spring retainer cap can be set at the required gap or at a zero lash than is now possible with present gap- adjusting devices without the significant problem of the valve head being forced into the valve chamber upon the thermal expansion of the valve stem.
  • the gap above the bushing allows the stem to expand therein by upward movement thereof. Since the bushing in the mechanical embodiment herein is not necessarily retained rigidly in place, it can allow the valve stem to move somewhat into the valve stem retainer.
  • valve stem retainer embodying this invention will advantageously provide a place of movement by its deformation when struck by the valve stem in situations where the engine is over-revved and the valve head is hit by the piston. This destruction or deformation of the bushing dissipates the destructive force, minimizing damage to the valve so that repairs may be made easily to the device embodying this invention without having to pull the head off the engine to reach a damaged valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (12)

1. Un système de réglage du jeu de dilatation thermique entre une tige de soupape et son système d'actionnement dans un moteur à combustion interne présentant une coupelle d'appui de ressort de soupape (10) avec une ouverture de recéption (16) de tige de soupape à l'une des extrémities, ladite coupelle d'appui de ressort de soupape (10) étant fixée de manière amovible à ladite tige par une clavette, caractérisée par un capuchon (26: 200; 300) situé à l'autre extrémité de ladite coupelle d'appui de ressort de soupape (10) et connecté à celle-ci de manière réglable et par un système de réglage (32, 26, 27) a) d'un premier jeu entre ledit capuchon (26; 200; 300) et ledit système d'actionnement et, par conséquent le réglage inverse d'un second jeu entre ledit capuchon (26; 200; 300) et ladite tige de soupape ou encore b) du dit second jeu et, conséquemment un réglage inverse dudit premier jeu, ledit système de réglage (32; 26; 27) comprenant un système (32) d'elévation ou d'abaissement dudit capuchon (26; 200, 300) par rapport à ladite coupelle d'appui de ressort de soupape (10) ledit capuchon (26; 200, 300) etant conçu pour ne pas s'attacher directement à ladite tige de soupape en fonctionnement normal et ne pas avoir, non plus, de contact avec ladite tige de soupape.
2. Un dispositif de réglage, d'après la revendication #1, caractérisé par un rebord (12; 14) de ladite coupelle d'appui de ressort de soupape (10) destiné à retenir latéralement ledit ressort de soupape (18, 20).
3. Un dispositif de réglage, d'après les revendications #1 ou #2, caractérisé par un système de blockage (34; 36; 38; 40) devant retenir ledit capuchon (26, 200, 300) dans une position bien determinée par rapport à ladite coupelle d'appui de ressort de soupape (10).
4. Un dispositif de réglage, d'apres la revendication #3, caractérisé par une multiplicité d'ouvertures (40; 302) sur la périphérie externe de la partie supérieure dudit capuchon (26; 200; 300) lesdits dispositifs de blocage (34; 36; 38; 40) etant conçus pour s'engager sélectivement dans lesdites overtures (40; 302) pour bloquer ledit capuchon (26; 200; 300) et prévenir toute rotation par rapport à la coupelle d'appui de ressort de soupape (10).
5. Un dispositif de réglage, d'après nimporte laquelle des revendications précédentes, caractérisé par un système (46) limitant le libre jeu de la dite tige de soupape à travers la dite ouverture qui lui est destinée.
6. Un dispositif de réglage, d'après la revendication #5, tel que ledit système (46) limitant le libre jeu de la tige de soupape permet la dilatation thermique et le contremouvement de cette dernière dans son ouverture de recep- tion.
7. Un dispositif de réglage, d'après les revendications #5 ou #6, caractérisé en ce que le système limitant le libre jeu de la tige est muni d'un coussinet (46) devant limiter ce libre jeu quand le coussinet est touche par ledit capuchon (26; 200; 300) et aussi le mouvement dudit capuchon (26; 200; 300) au cours du réglage dudit capuchon.
8. Un dispositif de réglage, suivant la revendication #1, caractérisé par l'inclusion
D'un système de rebord (14) prévu dans ladite coupelle d'appui de ressort de soupape (10) pour retenir un ressort de soupape intérieur (18);
D'une section extérieure (23) s'étendant vers le haut et filetée à l'intérieur (23) et faisant corps avec ladite coupelle d'appui de ressort de soupape (10);
D'une section centrale (22) s'étendant vers le haut et filetée à l'intérieur faisant corps avec ladite coupelle d'appui de ressort de soupape (10), dont la partie interne;
D'une ouverture pour penne de verrou (34) faite à la périphérie de ladite section extérieure (23) qui projette vers le haut dans ladite coupelle d'appui de ressort de soupape (10); et
D'un ressort (45) disposé entre le coussinet (46) et ledit capuchon, y inclus un système (24, 30; 22, 27) permettant son engagement dans la dite coupelle d'appui de ressort de soupape (10) et conçu pour permettre le réglage vers le haut ou vers les bas dudit capuchon de réglage (26) de la coupelle d'appui de ressort de soupape (10).
9. Un dispositif de réglage, d'après la revendication #8, tel que le capuchon de réglage de soupape (26) y presente une section extérieure filetée (30) et une projection centrale filetée (27) les deux étant concues pour s'engager dans les sections filetées (24, 22) de ladite coupelle d'appui de ressort de soupape.
10. Un dispositif de réglage, d'après la revendication #9, caractérisé par un capuchon de réglage de soupape (26) qui est composé d'un anneau extérieur (35) fileté et conçu pour s'engager dans la partie extérieure (24) filetée de ladite coupelle d'appui de ressort de soupape (10) presentant un rebord (37) autour de sa périphérie intérieure, ledit capuchon (26) ayant une partie intérieure, filetée (27) et conçue pour s'engager dans la partie centrale (22) filetée de la coupellé d'appui de ressort de soupape (10), dont la périphéie est destinée à venir se reposer contre ledit rebord (37) et de ce fait fournit un moyen de visser ledit anneau fileté (35) indépendamment du dit capuchon de réglage (26).
11. Un dispositif de réglage, d'après nimporte laquelle des revendications #8 à #10, caractérisé par le fait q'une projection manipulable (32) est située a la partie centrale dudit capuchon de réglage (26) pour mieux permettre la rotation dudit capuchon de réglage dans la coupelle d'appui de ressort de soupape (10).
12. Un dispositif de réglage, d'après la revendication #11, caractérisé par le fait que ladite projection (32) s'insêre dans une ouverture située à la face supérieure dudit capuchon de réglage (26).
EP82301647A 1982-03-29 1982-03-29 Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne Expired EP0090105B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP88121323A EP0375792B1 (fr) 1982-03-29 1982-03-29 Cuvette du ressort de soupape réglable pour un moteur à combustion interne
EP82301647A EP0090105B1 (fr) 1982-03-29 1982-03-29 Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne
DE8282301647T DE3280067D1 (de) 1982-03-29 1982-03-29 Verstellbarer ventilfederteller fuer eine brennkraftmaschine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82301647A EP0090105B1 (fr) 1982-03-29 1982-03-29 Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP88121323.5 Division-Into 1982-03-29

Publications (2)

Publication Number Publication Date
EP0090105A1 EP0090105A1 (fr) 1983-10-05
EP0090105B1 true EP0090105B1 (fr) 1989-12-20

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EP88121323A Expired - Lifetime EP0375792B1 (fr) 1982-03-29 1982-03-29 Cuvette du ressort de soupape réglable pour un moteur à combustion interne
EP82301647A Expired EP0090105B1 (fr) 1982-03-29 1982-03-29 Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne

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Application Number Title Priority Date Filing Date
EP88121323A Expired - Lifetime EP0375792B1 (fr) 1982-03-29 1982-03-29 Cuvette du ressort de soupape réglable pour un moteur à combustion interne

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DE (1) DE3280067D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0375792B1 (fr) * 1982-03-29 1995-01-18 Alfred Anthony Black Cuvette du ressort de soupape réglable pour un moteur à combustion interne
DE3912836A1 (de) * 1989-04-19 1990-10-25 Mico Ind Automation Vorrichtung zum befestigen eines rollenbolzens
DE4117406A1 (de) * 1991-05-28 1992-12-03 Freudenberg Carl Fa Ventiltrieb im zylinderkopf einer verbrennungskraftmaschine
DE10037577A1 (de) * 2000-08-02 2002-02-14 Bayerische Motoren Werke Ag Schließfeder-Vorrichtung für den Ventiltrieb eines Gaswechselventils einer Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030781A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1857005A (en) * 1931-08-01 1932-05-03 Joseph G Schotthoefer Valve mechanism for internal combustion engines
US1972477A (en) * 1932-02-03 1934-09-04 Herbert H Engemann Automatic device for tappet valve adjustments
US2722204A (en) * 1953-06-05 1955-11-01 Daimler Benz Ag Means for adjusting the lost motion of the valve actuation in internal combustion engines
CH322762A (de) * 1954-06-11 1957-06-30 Sulzer Ag Hydraulische Vorrichtung zum Ausgleich des Ventilspiels
US3675631A (en) * 1970-06-03 1972-07-11 William J Hixson Adjustable cam follower
US3823698A (en) * 1972-01-18 1974-07-16 Lamb Co F Jos Mechanical lash adjuster
DE2652154A1 (de) * 1976-11-16 1978-05-18 Motomak Hydraulisches spielausgleichselement fuer verbrennungsmotoren
DE3006644A1 (de) * 1980-02-22 1981-09-03 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt Ventilstoessel fuer brennkraftmaschinen mit obenliegender nockenwelle
EP0375792B1 (fr) * 1982-03-29 1995-01-18 Alfred Anthony Black Cuvette du ressort de soupape réglable pour un moteur à combustion interne

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030781A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct

Also Published As

Publication number Publication date
EP0375792B1 (fr) 1995-01-18
EP0375792A1 (fr) 1990-07-04
EP0090105A1 (fr) 1983-10-05
DE3280067D1 (de) 1990-01-25

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