EP0375792A1 - Cuvette du ressort de soupape réglable pour un moteur à combustion interne - Google Patents

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

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Publication number
EP0375792A1
EP0375792A1 EP88121323A EP88121323A EP0375792A1 EP 0375792 A1 EP0375792 A1 EP 0375792A1 EP 88121323 A EP88121323 A EP 88121323A EP 88121323 A EP88121323 A EP 88121323A EP 0375792 A1 EP0375792 A1 EP 0375792A1
Authority
EP
European Patent Office
Prior art keywords
cap
valve stem
valve spring
spring retainer
aperture
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.)
Granted
Application number
EP88121323A
Other languages
German (de)
English (en)
Other versions
EP0375792B1 (fr
Inventor
Alfred Anthony Black
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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 DE3280466T priority Critical patent/DE3280466D1/de
Priority to EP88121323A priority patent/EP0375792B1/fr
Publication of EP0375792A1 publication Critical patent/EP0375792A1/fr
Application granted granted Critical
Publication of EP0375792B1 publication Critical patent/EP0375792B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 hydraulic adjustment or compensation for any unwanted gaps arising between the cam shaft and/or rocker arm and the 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 rocker arm is usually actuated by a cam located in association therewith.
  • gaps are usually provided between the valve stem and rocker arm.
  • An hydraulic arrangement for adjusting or compensating for unwanted gaps or gap variations is disclosed in Swiss Patent No. 322762. However it is considered that this arrangement does not provide a wholly appropriate solution.
  • an adjustor to compensate for thermal expansion between a valve stem and its operation means within an internal combustion engine, an adjustor comprising a valve spring retainer member having at one end a valve stem receipt aperture, 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 longitudinally adjustable in position with respect thereto, and means to permit either (a) the restoration of a first longitudinal positional relationship between said cap member and said operation means and, as a result, corresponding restoration in an opposite direction of a second longitudinal positional relationship between said cap member and said valve stem, or (b) the restoration of said second longitudinal positional relationship and, as a result, corresponding restoration in an opposite direction of said first longitudinal positional relationship, said restoration permitting means including means to vary the longitudinal distance between said cap member and 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.
  • said restoration permitting means is arranged to raise or lower the cap member in relation to said valve spring retainer member and is hydraulically operable.
  • the cap member is mounted on the open top of said valve spring retainer member, a seal member is positioned in said valve spring retainer between said cap member and said valve stem receipt bore, and said valve spring retainer, cap member and seal member form an hydraulic pressure chamber within said valve spring retainer, said pressure chamber having an open communication into said valve stem receipt bore which in normal operation is closed by said seal member so as to retain hydraulic fluid under pressure within said hydraulic pressure chamber.
  • said seal member is adapted to be removable from said valve spring retainer member.
  • hydraulic pressure means are provided in said hydraulic pressure chamber for adjustment of the spatial relation of said cap member to said seal member to adjust for said thermal expansion.
  • said hydraulic pressure means comprises a plunger disposed between said cap member and said seal member in said hydraulic pressure chamber and adapted to increase the fluid pressure within said chamber when said cap member is depressed by said operation means; and further comprises an hydraulic fluid reservoir adapted to supply hydraulic fluid to said chamber.
  • said hydraulic fluid reservoir is located within said plunger and said valve spring retainer further includes a secondary fluid reservoir interconnected to the first-mentioned hydraulic fluid reservoir by at least one aperture in said cap member.
  • said secondary fluid reservoir is provided with an inlet aperture for the entry therein of hydraulic fluid under pressure from the lubricating system of an internal combustion engine.
  • said cap member is provided with at least one aperture for passage of lubricating system fluid out of either the first-mentioned hydraulic fluid reservoir or said secondary fluid reservoir, and further means are provided to supply said lubricating system's fluid under pressure through said aperture(s) to lubricate the upper surface of said cap member.
  • said inlet aperture or each of said apertures permits fluid entry into said secondary fluid reservoir and its supply therefrom via the first-mentioned aperture(s) into said first-mentioned hydraulic fluid reservoir by splashing of said fluid into said first mentioned aperture(s) by reciprocating motion due to operation of the hydraulic adjustor.
  • One herein-disclosed embodiment of this invention provides a valve adjustor base and cap member which can be used with hydraulic lifters (for which, since no adjustments are needed, there are no threadd parts between the cap member and the valve spring retainer base).
  • a chamber is provided within the cap member which, when positioned within the valve spring retainer base, is held in position by a semi-circular clip which fits within a groove provided in the upper outer portion of the valve spring retainer base.
  • An hydraulic piston is positioned above a valve stem bushing and has provided therebetween a preloaded spring and ball combination for the capture of hydraulic fluid therein upon the downward thrust of the cam or the rocker arm.
  • the piston may be hollowed in its upper portion and have an aperture in its bottom aligned with the ball.
  • the ball operates as an hydraulic valve for the piston, the piston being just above the ball, riding in the bore just above the pressure chamber.
  • the cap member When the cap member is depressed, it moves the piston inward toward the centre of its chamber, thereby compressing oil within the pressure chamber which action provides the means for transferring the movement of the cap member to the valve spring retainer base due to the minimal compressibility of the oil therein.
  • some oil will leak backwards out of the pressure chamber formed by the hollow in the retainer and the corresponding piston past the piston wall.
  • Back flow through the centre hole of the piston is controlled by the ball which closes off the oil return when the piston compresses the oil, while - at the times when there is no force thereupon - the ball allows oil to enter the pressure chamber below.
  • This hydraulic embodiment has advantages over the current art which incorporates an hydraulic lifter within a separate housing bored into the top of the cylinder head in that it allows a large percentage of this housing or tappet guide to be eliminated except for a small percentage located on opposite sides of the retainer in line with the cam's direction of rotation. This design lessens the cylinder head weight and the friction between the tappet and the tappet guide.
  • the hydraulic embodiment of this invention is held in position by the keeper key on the valve stem and the pressure of the valve spring upwards against the valve spring retainer base. This embodiment simplifies substantially the construction of hydraulic lifters and lessens significantly their weight.
  • a valve stem bushing acts as a seal and prevents the escape of oil fluid from the pressure chamber down along the valve stem.
  • valve stem bushing can be threaded into its position to prevent its movement out of its seat or sealed in position by an a circlip or an inserted cup insert.
  • a hole can be provided within the valve spring retainer or cap member which would allow oil to circulate therein which, as mentioned above, would lessen the noise from resonance and act as a reservoir of oil from which the pressure chamber would draw for its proper operation. It should be noted that in this embodiment this is an additional reservoir if the engine should run low on oil, oil would still be provided within the pressure chamber due to its being trapped betweeen the valve spring retainer base and the cap member.
  • An alternative embodiment of the hydraulic version of this invention utilizes a hardened steel upper cap member with a lower cap member made of aluminium, aluminum-like material or lightweight material having a reservoir defined therein. Below the reservoir is a hardened inverted cup member with an aperture defined therein. A second hardened cup member is placed in the valve spring retainer base and contains a hollow piston member. Within the upwardly facing hollow is the spring cage and ball which control entry of fluid from the reservoir.
  • valve spring retainer base 60 has on its bottom portion a downwardly protruding outer valve spring retaining lip (into which the outer valve spring is engaged), an inner valve spring retainer lip (into which the inner valve spring is engaged), and a valve stem receipt aperture 76 into which the valve stem passes.
  • Apertue 76 is somewhat narrower at itas 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.
  • a central portion 62 of the valve spring retainer base is provided with a valve stem bushing receipt ledge, and with an upwardly directed non-threaded projection 80,82.
  • the valve spring retainer base 60 has an upwardly extending peripheral portion 64 that too is non-threaded.
  • a retainer cap 66 is positioned within the valve spring retainer base and is held in place by retainer clip 68 which fits within groove 70 within the valve spring retainer base 60.
  • a valve stem bushing 72 is loccated at position 74 above the valve stem receipt bore 76 above which is positioned piston or plunger 78 which rides within pressure chamber 80 formed by projections 82 extending from valve spring retainer base 60. Below the piston or plunger 78 is located ball member 84 and cage 86 with spring member 88 positioned therebelow. At least one aperture 90 can be provided to allow for the entrance of oil into reservoir 81 for the hydraulic action as described above and one or more apertures 92, 93 may be positioned within the valve spring retainer base 60 or cap 66 to allow for the entrance of oil therein.
  • FIG. 3 Illustrated in Figure 3 is the second embodiment of the hydraulic version utilizing hardened cap 191 above lower cap 192 which has a reservoir 94 defined therein with oil entrance aperture 96 to allow oil into the reservoir.
  • This embodiment has adjustment means 106 comprising an inverted hardened cap 100 with an aperture defined therein positioned below the reservoir and an opposed hardened cup 102 positioned above the valve stem receipt bore 101.
  • cup 102 Within cup 102 is hollow piston or plunger 104.
  • ball 108 Within the upward facing hollow portion is ball 108 aligned with the aperture in the upper cap 100.
  • a cage member 110 and spring 112 which extends to the inside hollow of piston or plunger 104.
  • 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 vale 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
EP88121323A 1982-03-29 1982-03-29 Cuvette du ressort de soupape réglable pour un moteur à combustion interne Expired - Lifetime EP0375792B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3280466T DE3280466D1 (de) 1982-03-29 1982-03-29 Verstellbarer Ventilfederteller für eine Brennkraftmaschine.
EP88121323A EP0375792B1 (fr) 1982-03-29 1982-03-29 Cuvette du ressort de soupape réglable pour un moteur à combustion interne

Applications Claiming Priority (2)

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
EP88121323A EP0375792B1 (fr) 1982-03-29 1982-03-29 Cuvette du ressort de soupape réglable pour un moteur à combustion interne

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP82301647.2 Division 1982-03-29

Publications (2)

Publication Number Publication Date
EP0375792A1 true EP0375792A1 (fr) 1990-07-04
EP0375792B1 EP0375792B1 (fr) 1995-01-18

Family

ID=8189622

Family Applications (2)

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

Family Applications Before (1)

Application Number Title Priority Date Filing Date
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

Country Status (2)

Country Link
EP (2) EP0090105B1 (fr)
DE (1) DE3280067D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0090105B1 (fr) * 1982-03-29 1989-12-20 Alfred Anthony Black Cuvette réglable pour le bas du ressort de soupape 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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH322762A (de) * 1954-06-11 1957-06-30 Sulzer Ag Hydraulische Vorrichtung zum Ausgleich des Ventilspiels
FR2370858A1 (fr) * 1976-11-16 1978-06-09 Motomak Element de rattrapage de jeu hydraulique pour moteurs a combustion interne
FR2476740A1 (fr) * 1980-02-22 1981-08-28 Motomak Poussoir de soupape pour moteurs a combustion interne avec arbre a cames en tete
EP0090105A1 (fr) * 1982-03-29 1983-10-05 Alfred Anthony Black Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne

Family Cites Families (6)

* 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
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
EP0030781B1 (fr) * 1979-12-05 1989-12-13 Eaton Corporation Poussoir hydraulique pour vanne à entrainement direct

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH322762A (de) * 1954-06-11 1957-06-30 Sulzer Ag Hydraulische Vorrichtung zum Ausgleich des Ventilspiels
FR2370858A1 (fr) * 1976-11-16 1978-06-09 Motomak Element de rattrapage de jeu hydraulique pour moteurs a combustion interne
FR2476740A1 (fr) * 1980-02-22 1981-08-28 Motomak Poussoir de soupape pour moteurs a combustion interne avec arbre a cames en tete
EP0090105A1 (fr) * 1982-03-29 1983-10-05 Alfred Anthony Black Cuvette réglable pour le bas du ressort de soupape pour un moteur à combustion interne

Also Published As

Publication number Publication date
EP0090105B1 (fr) 1989-12-20
DE3280067D1 (de) 1990-01-25
EP0090105A1 (fr) 1983-10-05
EP0375792B1 (fr) 1995-01-18

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