US3880128A - Valve actuation mechanism including valve lash adjustment means - Google Patents

Valve actuation mechanism including valve lash adjustment means Download PDF

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Publication number
US3880128A
US3880128A US35652473A US3880128A US 3880128 A US3880128 A US 3880128A US 35652473 A US35652473 A US 35652473A US 3880128 A US3880128 A US 3880128A
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Prior art keywords
stud
means
bore
head
cylinder
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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 - Lifetime
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George F Stirrat
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Ford Motor Co
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Ford Motor Co
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • F01L1/185Overhead end-pivot rocking arms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02Valve drive
    • F01L1/04Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047Camshafts
    • F01L1/053Camshafts overhead type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/18Rocking arms or levers
    • F01L2001/187Clips, e.g. for retaining rocker arm on pivot
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/20Control lever and linkage systems
    • Y10T74/20576Elements
    • Y10T74/20582Levers
    • Y10T74/206Adjustable

Abstract

A lash adjustor for the valve actuating mechanism of an internal combustion engine having an overhead camshaft comprising an adjustable rocker arm fulcrum. A fulcrum stud is slidingly received within a bore formed in the cylinder head. A spring biases the stud to a position of maximum protrusion to permit automatic positioning of the stud for lash adjustment. A clamp may be tightened about the stud to fix its position relative to the cylinder head.

Description

United States Patent Stirrat Apr. 29, 1975 VALVE ACTUATION MECHANISM mar/.239 1/1935 Lochrane .v 123/9052 INCLUDING VALVE LASH ADJUSTMENT 2,4181 10 4/l947 Burkhardt.... H l23/9U.45 MEANS 15643902 8/l95l Houser .7 Ill/90.45 2923.282 2/1960 White .v Q3/9045 [75] Inventor: George F. Stir-rat, Bloomfield Hills 3.542.001 11/1 70 Linc A i i i 4 t v l33/ v 3 Mi h 3,779.58? 12/1973 Racine it 285/323 n3] Asslgnee: 5 Motor company Dembom Primar Eran1im'rManuel A. Antonakas 1c Assistant Examiner-Daniel J. OConnor {22] Filed: May 2, 1973 Artur-n0 Agent. or Firm-Roger E. Erickson; Keith L. [2]] Appl. No; 356,524 Zemh'mg [57] ABSTRACT 7 7 7 lshl l23/90's2 74/52 'icgg j A lash adjustor for the valve actuating mechanism of [51] Int Cl b an internal combustion engine having an overhead camshaft comprising an adjustable rocker arm full58] Flow of Crum. A fulcrum stud is slidingly received within a 2815,755 bore formed in the cylinder head. A spring biases the stud to a position of maximum protrusion to permit automatic positioning of the stud for lash adjustment. l56] References cued A clamp may be tightened about the stud to fix its po- UNITED STATES PATENTS sition relative to the cylinder head. 1.577970 3/l926 Hosterman l23/90.43 1.583.335 5/[926 Borschcl 123 9052 Clam 3 D'awmg figures [I A [31." l 1/ 1/ M g 1/ 42 H u l J w 7"' t l u 1; I

VALVE ACTUATION MECHANISM INCLUDING VALVE LASI-I ADJUSTMENT MEANS BACKGROUND AND SUMMARY OF THE INVENTION Clearance is required between the elements of an internal combustion engine valve actuation mechanism to permit thermal expansion and to reduce element wear. A means commonly utilized in prior art engines to adjust the lash between the elements of the valve actuation mechanism is a threaded fulcrum stud received in a threaded bore in the engine cylinder head. The stud is rotated with a wrench until a feeler gauge may be inserted properly between the rocker arm and the camshaft.

This invention provides a valve lash adjustor which is not dependent upon the subjective feel of the gauge inserted between the rocker arm and the camshaft. It also provides a valve lash adjustment means in which the clearance may be simply adjusted by positioning a gauge between the camshaft and the rocker arm and by loosening and retightening the clamp means. The invention further provides lash adjustment means which assures uniformity in lash adjustment among the several valve operating mechanisms of a multicylinder engine. Still further, the invention provides valve lash adjustment means adaptable for use in currently used overhead camshaft engines and which is economical to produce and reliable in operation.

Valve lash adjustment means constructed in accordance with this invention include a bore formed in the cylinder head of the engine slidingly receiving a fulcrum stud. A compression spring is engagable with the received end of the stud and urges the protrusion of the stud from the bore. A clamp means is threadedly engagable with the cylinder head and frictionally engagable with the stud.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I of the drawings is a transverse cross sectional view with portions in elevation of a valve actuating mechanism incorporating this invention.

FIG. 2 is a cross sectional view taken along line 2-2 of FIG. 1.

FIG. 3 is a cross sectional view of an alternate embodiment of an adjustable fulcrum.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In FIG. 1 of the drawings. reference numeral 11 refers to a portion of a cylinder head of an internal combustion engine having an overhead camshaft l3. Reciprocably mounted within a bore 15 formed in the cylinder head is an intake or exhaust valve 17 having a protruding stem portion 19. A spring retainer assembly 21 is secured to the end of the valve stem by the aid of a split conical collar 23. The collar has a radially inwardly extending annular flange cooperating in the conventional manner with an annular groove formed in the valve stem. A coil spring 25 is compressed between the retainer 21 and a spring seat 27 formed in the cylinder head. An oil seal 29 is positioned about the valve stem boss 31 and slidingly engages the valve stem.

A second bore 33 is formed in the cylinder head 11 which slidingly receives a fulcrum stud 3S and a compression spring 37. Bore 33 opens into an enlarged threaded bore 39 which receives a threaded insert 41.

The insert includes a hexagonal head portion 43 rotatable by means ofa conventional open end wrench. The insert has an inner bore 45 and a tapered or conical surface 47. Received within the bore 45 and the conical surfaces 47 of the insert is a split collar 49 having outwardly directed conical surfaces 5l-which correspond to the inwardly facing conical surfaces 47 of the insert. The inner surfaces 53 of the split collar are cylindrical of a radius substantially equal to that of the fulcrum stud stem 35.

The fulcrum stud 35 includes a spherical head portion 55 and a pair of annular flanges defining an annular groove 57. Positioned between the end 58 of the valve stem 19 and the head 55 of the fulcrum stud is a rocker arm 61. The rocker arm includes a spherical socket portion 63 that receives the spherical surface 55 of the fulcrum stud to provide a universal pivot. Spring clip assembly 65 is engagable with the rocker arm and groove 57 of stud 35 to resiliently bias the rocker arm into engagement with the head of the pivot stud and with the end of the valve stem.

The overhead camshaft I3 is mounted to the cylinder head for rotation about a predetermined axis 66. Each cam surface 67 engages an upwardly directed pad portion 69 of the rocker arm 61.

To adjust valve lash, a feeler gauge of the desired thickness is inserted between the base cam surface 67 and the rocker arm pad 69. The insert 41 is turned with a wrench so that it moves upwardly relative to the cylinder head, loosens the split collar 49 and releases the fulcrum stud 35. The stud is pushed upwardly by the force of compression spring 37 until no significant clearance exists between elements of the valve actuation mechanism. The insert is then tightened so that the split collar 49 once again grips the pivot stud and fixes its position relative to the cylinder head. A washer 71 is positioned about the pivot stud at the base of the threaded bore 39 and engages the inner ends of the split collar 49 to prevent gouging of the cylinder head.

DESCRIPTION OF AN ALTERNATE EMBODIMENT An alternate embodiment of the lash adjustor is shown in FIG. 3. In this embodiment the threaded insert 73 has a pair of conical portions 75 and 77. The split collar 79 has corresponding conical surfaces SI and 83. As the insert is drawn into the threaded bore 39 of the cylinder head the conical surfaces interact forcing the split collar members radially inwardly to grip the pivot stud 35 and to fix the position of the stud relative to the cylinder head.

Modifications and alterations will occur to those skilled in the art which are included within the scope of the following claims.

I claim:

1. In an internal combustion engine having a cylinder head,

a bore formed in the cylinder head,

a rocker arm fulcrum stud slidingly received within said bore and having one end protruding therefrom,

spring means engagable with said stud urging the protrusion of said stud from said bore,

clamp means threadedly engagable with said cylinder head and frictionally engagable with said stud,

said clamp means being movable to release and to secure said stud relative to said cylinder head.

2. in an internal combustion engine according to claim I, said spring means comprising a compression spring received within said bore.

said spring acting between the base of said bore and the received end of said stud.

3. ln an internal combustion engine according to claim 1, said clamp means comprising an insert member positioned about said stud. said insert member having a threaded portion coaxial with said bore threadedly received within said cylinder head, said insert member including an inwardly directed conical surface.

split collar means having outwardly directed conical surfaces corresponding to and engagable with said insert member conical surface. said split collar means having inwardly directed cylindrical surfaces corresponding to and cooperating with said stud.

abutment means formed in said cylinder head about said bore limiting the axial displacement in one direction of said split collar means.

4. In an internal combustion engine, a cylinder head. a valve having a valve stem reciprocally mounted within said cylinder head, a fulcrum stud mounted within said cylinder head, a camshaft rotatably mounted to said cylinder head, a rocker arm having one end pivotably mounted on said stud, the other end positioned at the end of said valve stem and an intermediate portion slidingly engagable with said camshaft,

a bore formed in said cylinder head.

said stud being slidingly received within said bore,

spring means engagable with stud urging the protrusion of said stud from said bore.

clamp means threadedly engagable with said cylinder head and frictionally engagable with said stud, said clamp means being movable to release said stud or to secure said stud relative to said cylinder head.

5. In an internal combustion engine according to claim 4, said spring means comprising a compression spring received within said bore.

said spring acting between the base of said bore and the received end of said stud.

6. In an internal combustion engine according to claim 4, said clamp means comprising an insert member positioned about said stud. said insert member having a threaded portion coaxial with said bore threadedly received within said cylinder head, said insert member including an inwardly directed conical surface.

split collar means having outwardly directed conical surfaces corresponding to and engagable with said insert member conical surface. said split collar means having inwardly directed cylindrical surfaces corresponding to and cooperating with said stud.

abutment means formed in said cylinder head about said bore limiting the axial displacement in one direction of said split collar means.

7. In an internal combustion engine according to claim 6, said spring means comprising a compression spring received within said bore,

said spring acting between the base of said bore and the received end of said stud.

8. ln an internal combustion engine according to claim 4, said bore opening into a threaded bore formed in said cylinder head, said threaded bore being concentric with said first mentioned bore and having a relatively larger diameter.

said clamp means comprising an insert member positioned about said stud and having a portion thread edly received within said threaded bore. said insert member including an inwardly directed conical surface,

split collar means positioned within said insert member and about said stud, said split collar means having outwardly directed conical surfaces corresponding to and engagable with said insert member conical surface and having inwardly directed cylindrical surfaces corresponding to and cooperating with said stud.

said insert member being rotatable in one direction to tighten said split collar means about said stud and in the other direction to release said split collar means from about said stud and to permit said stud to slide within said first mentioned bore.

9. In an internal combustion engine according to claim 8, said spring means comprising a compression spring received within said bore.

said spring acting between the base of said bore and the received end of said stud.

10. In an internal combustion engine according to claim 4, said clamp means comprising an insert member positioned about said stud, said insert member having a threaded portion conical with said bore and threadedly received within said cylinder head. said insert member including a pair of inwardly directed conical surfaces separated by an inwardly directed cylindrical surface.

split color means having a pair of outwardly directed conical surfaces corresponding respectively to and engagable with said insert member conical surfaces, said split collar means having inwardly directed cylindrical surfaces corresponding to and cooperating with contiguous surfaces of said stud.

H. The combination of claim 10, said spring means comprising a compression spring received within said bore,

said spring acting between the base of said bore and the received end of said stud.

Claims (11)

1. In an internal combustion engine having a cylinder head, a bore formed in the cylinder head, a rocker arm fulcrum stud slidingly received within said bore and having one end protruding therefrom, spring means engagable with said stud urging the protrusion of said stud from said bore, clamp means threadedly engagable with said cylinder head and frictionally engagable with said stud, said clamp means being movable to release and to secure said stud relative to said cylinder head.
2. In an internal combustion engine according to claim 1, said spring means comprising a compression spring received within said bore, said spring acting between the base of said bore and the received end of said stud.
3. In an internal combustion engine according to claim 1, said clamp means comprising an insert member positioned about said stud, said insert member having a threaded portion coaxial with said bore threadedly received within said cylinder head, said insert member including an inwardly directEd conical surface, split collar means having outwardly directed conical surfaces corresponding to and engagable with said insert member conical surface, said split collar means having inwardly directed cylindrical surfaces corresponding to and cooperating with said stud, abutment means formed in said cylinder head about said bore limiting the axial displacement in one direction of said split collar means.
4. In an internal combustion engine, a cylinder head, a valve having a valve stem reciprocally mounted within said cylinder head, a fulcrum stud mounted within said cylinder head, a camshaft rotatably mounted to said cylinder head, a rocker arm having one end pivotably mounted on said stud, the other end positioned at the end of said valve stem and an intermediate portion slidingly engagable with said camshaft, a bore formed in said cylinder head, said stud being slidingly received within said bore, spring means engagable with stud urging the protrusion of said stud from said bore, clamp means threadedly engagable with said cylinder head and frictionally engagable with said stud, said clamp means being movable to release said stud or to secure said stud relative to said cylinder head.
5. In an internal combustion engine according to claim 4, said spring means comprising a compression spring received within said bore, said spring acting between the base of said bore and the received end of said stud.
6. In an internal combustion engine according to claim 4, said clamp means comprising an insert member positioned about said stud, said insert member having a threaded portion coaxial with said bore threadedly received within said cylinder head, said insert member including an inwardly directed conical surface, split collar means having outwardly directed conical surfaces corresponding to and engagable with said insert member conical surface, said split collar means having inwardly directed cylindrical surfaces corresponding to and cooperating with said stud. abutment means formed in said cylinder head about said bore limiting the axial displacement in one direction of said split collar means.
7. In an internal combustion engine according to claim 6, said spring means comprising a compression spring received within said bore, said spring acting between the base of said bore and the received end of said stud.
8. In an internal combustion engine according to claim 4, said bore opening into a threaded bore formed in said cylinder head, said threaded bore being concentric with said first mentioned bore and having a relatively larger diameter, said clamp means comprising an insert member positioned about said stud and having a portion threadedly received within said threaded bore, said insert member including an inwardly directed conical surface, split collar means positioned within said insert member and about said stud, said split collar means having outwardly directed conical surfaces corresponding to and engagable with said insert member conical surface and having inwardly directed cylindrical surfaces corresponding to and cooperating with said stud, said insert member being rotatable in one direction to tighten said split collar means about said stud and in the other direction to release said split collar means from about said stud and to permit said stud to slide within said first mentioned bore.
9. In an internal combustion engine according to claim 8, said spring means comprising a compression spring received within said bore, said spring acting between the base of said bore and the received end of said stud.
10. In an internal combustion engine according to claim 4, said clamp means comprising an insert member positioned about said stud, said insert member having a threaded portion conical with said bore and threadedly received within said cylinder head, said insert member including a pair of inwardly directed conical surfaces separated by an inwardly directed cylindrical surface, split color means having a pair of outwardly directed conical surfaces corresponding respectively to and engagable with said insert member conical surfaces, said split collar means having inwardly directed cylindrical surfaces corresponding to and cooperating with contiguous surfaces of said stud.
11. The combination of claim 10, said spring means comprising a compression spring received within said bore, said spring acting between the base of said bore and the received end of said stud.
US3880128A 1973-05-02 1973-05-02 Valve actuation mechanism including valve lash adjustment means Expired - Lifetime US3880128A (en)

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Application Number Priority Date Filing Date Title
US3880128A US3880128A (en) 1973-05-02 1973-05-02 Valve actuation mechanism including valve lash adjustment means

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US3880128A US3880128A (en) 1973-05-02 1973-05-02 Valve actuation mechanism including valve lash adjustment means
CA 189834 CA1000144A (en) 1973-05-02 1974-01-10 Valve actuation mechanism including valve lash adjustment means for internal combustion engines
DE19742415829 DE2415829A1 (en) 1973-05-02 1974-04-02 Above-controlled ventilbetaetigungseinrichtung for an internal combustion engine
JP4562874A JPS5833366B2 (en) 1973-05-02 1974-04-24
GB1858474A GB1437567A (en) 1973-05-02 1974-04-29 Valve actuating mechanism in an internal combustion engine

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US3880128A true US3880128A (en) 1975-04-29

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US3880128A Expired - Lifetime US3880128A (en) 1973-05-02 1973-05-02 Valve actuation mechanism including valve lash adjustment means

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US (1) US3880128A (en)
JP (1) JPS5833366B2 (en)
CA (1) CA1000144A (en)
DE (1) DE2415829A1 (en)
GB (1) GB1437567A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941102A (en) * 1973-08-18 1976-03-02 British Leyland Uk Limited Bucket tappets
US4369740A (en) * 1976-12-01 1983-01-25 Bayerische Motoren Werke A.G. Valve-actuating lever
US4856468A (en) * 1987-07-30 1989-08-15 Ina Walzlager Schaeffler Kg Ball-and-socket joint
WO2004038186A1 (en) * 2002-10-24 2004-05-06 Ina-Schaeffler Kg Drag lever of a valve mechanism in an internal combustion engine
US20050183684A1 (en) * 2004-02-25 2005-08-25 James Strepek Valve operating system in an internal combustion engine
FR2925574A3 (en) * 2007-12-21 2009-06-26 Renault Sas Valve e.g. intake valve, control device for oil engine of vehicle, has movable stop including support element that is provided in contact with end, where position of movable element defines displacement amplitude of valve
CN101229621B (en) 2008-02-22 2010-04-07 铁岭天河机械制造有限责任公司 Motor car engine rocker processing chucking appliance
WO2010108374A1 (en) * 2009-03-27 2010-09-30 奇瑞汽车股份有限公司 Engine distribution mechanism with adjustable lift air valve

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58126409A (en) * 1982-01-25 1983-07-27 Toyota Motor Corp Driving mechanism for plural valves
JPS59118500A (en) * 1982-12-27 1984-07-09 Showa Denko Kk Transparent enclosed body
FR2540553B1 (en) * 1983-02-03 1985-05-17 Renault
JPH0263082B2 (en) * 1983-11-17 1990-12-27 Toyota Motor Co Ltd
JPH0258443B2 (en) * 1984-01-13 1990-12-07 Toyota Motor Co Ltd
JPH0258442B2 (en) * 1984-01-13 1990-12-07 Toyota Motor Co Ltd
DE10020116A1 (en) * 2000-04-22 2002-06-06 Ina Schaeffler Kg Bearing assembly for valve gear of internal combustion engine has locking means comprising nut limiting bolt in direction of one end, and wedge component which fits in bore of swivel head by point

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US1577970A (en) * 1923-01-02 1926-03-23 Ahron Motor & Mfg Company Internal-combustion engine
US1583335A (en) * 1924-03-22 1926-05-04 Alfred F Borschel Valve silencer
US1987239A (en) * 1932-07-08 1935-01-08 Harold M Lochrane Valve mechanism adjusting device
US2418110A (en) * 1942-08-22 1947-04-01 Otto M Burkhardt Clearance regulator
US2564902A (en) * 1949-11-02 1951-08-21 H & K Valve Silencer Company Tappet valve silencer
US2923282A (en) * 1958-07-30 1960-02-02 Colen L White Engine valve tappet
US3542001A (en) * 1968-10-25 1970-11-24 Eaton Yale & Towne Hydraulic lifter with lash compensator
US3779587A (en) * 1972-08-23 1973-12-18 W Racine Tube end fitting

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Publication number Priority date Publication date Assignee Title
JPS432645Y1 (en) * 1964-08-07 1968-02-03

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1577970A (en) * 1923-01-02 1926-03-23 Ahron Motor & Mfg Company Internal-combustion engine
US1583335A (en) * 1924-03-22 1926-05-04 Alfred F Borschel Valve silencer
US1987239A (en) * 1932-07-08 1935-01-08 Harold M Lochrane Valve mechanism adjusting device
US2418110A (en) * 1942-08-22 1947-04-01 Otto M Burkhardt Clearance regulator
US2564902A (en) * 1949-11-02 1951-08-21 H & K Valve Silencer Company Tappet valve silencer
US2923282A (en) * 1958-07-30 1960-02-02 Colen L White Engine valve tappet
US3542001A (en) * 1968-10-25 1970-11-24 Eaton Yale & Towne Hydraulic lifter with lash compensator
US3779587A (en) * 1972-08-23 1973-12-18 W Racine Tube end fitting

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941102A (en) * 1973-08-18 1976-03-02 British Leyland Uk Limited Bucket tappets
US4369740A (en) * 1976-12-01 1983-01-25 Bayerische Motoren Werke A.G. Valve-actuating lever
US4856468A (en) * 1987-07-30 1989-08-15 Ina Walzlager Schaeffler Kg Ball-and-socket joint
WO2004038186A1 (en) * 2002-10-24 2004-05-06 Ina-Schaeffler Kg Drag lever of a valve mechanism in an internal combustion engine
US20060225680A1 (en) * 2002-10-24 2006-10-12 Helmut Engelhardt Drag lever of a valve mechanism in an internal combustion engine
US7219639B2 (en) 2002-10-24 2007-05-22 Ina-Schaeffler Kg Drag lever of a valve mechanism in an internal combustion engine
US20050183684A1 (en) * 2004-02-25 2005-08-25 James Strepek Valve operating system in an internal combustion engine
FR2925574A3 (en) * 2007-12-21 2009-06-26 Renault Sas Valve e.g. intake valve, control device for oil engine of vehicle, has movable stop including support element that is provided in contact with end, where position of movable element defines displacement amplitude of valve
CN101229621B (en) 2008-02-22 2010-04-07 铁岭天河机械制造有限责任公司 Motor car engine rocker processing chucking appliance
WO2010108374A1 (en) * 2009-03-27 2010-09-30 奇瑞汽车股份有限公司 Engine distribution mechanism with adjustable lift air valve

Also Published As

Publication number Publication date Type
CA1000144A1 (en) grant
JPS5833366B2 (en) 1983-07-19 grant
JPS5013713A (en) 1975-02-13 application
CA1000144A (en) 1976-11-23 grant
DE2415829A1 (en) 1974-11-21 application
GB1437567A (en) 1976-05-26 application
JP1200113C (en) grant

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