EP0490426A1 - Ventilstössel - Google Patents

Ventilstössel Download PDF

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Publication number
EP0490426A1
EP0490426A1 EP91203144A EP91203144A EP0490426A1 EP 0490426 A1 EP0490426 A1 EP 0490426A1 EP 91203144 A EP91203144 A EP 91203144A EP 91203144 A EP91203144 A EP 91203144A EP 0490426 A1 EP0490426 A1 EP 0490426A1
Authority
EP
European Patent Office
Prior art keywords
valve lifter
lifter
depending
valve
cam lobe
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
EP91203144A
Other languages
English (en)
French (fr)
Other versions
EP0490426B1 (de
Inventor
John Joseph Krieg
Steven Frederick Lowe
Christopher Mark De Minco
Wayne Stanley Harris
Michael James Fox
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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
Priority claimed from US07/628,694 external-priority patent/US5090364A/en
Priority claimed from US07/678,402 external-priority patent/US5070827A/en
Application filed by Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of EP0490426A1 publication Critical patent/EP0490426A1/de
Application granted granted Critical
Publication of EP0490426B1 publication Critical patent/EP0490426B1/de
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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • 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
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • valve lifters also called tappets or cam followers
  • the invention relates to so-called direct acting valve lifters.
  • the present invention seeks to provide an improved valve lifter.
  • valve lifter as specified in claim 1.
  • oval used herein is intended to cover any suitable shape having its chief axis longer than its transverse diameter.
  • This invention can provide means to minimize valve lifter mass through changes in geometry not requiring special materials.
  • the valve lifter preferably has a cam lobe contact surface that is approximately the width of or slightly wider than the width of an associated cam lobe.
  • the contact surface may be extended longitudinally (usually in the direction of the cam sliding motion) as desired to allow high velocity cam profiles to be used without requiring an increase in the width of the contact surface or the lifter.
  • Semi-cylindrical end walls or skirts may depend from the longitudinal ends of the cam lobe contact surface to guide and stabilize the lifter in the lifter gallery.
  • the walls may be ribbed for strength.
  • a circular recess in a mechanical version of the lifter is adapted to receive a valve shim.
  • a cylindrical depending wall between the semi-cylindrical skirts defines a cylinder to receive a hydraulic lash adjuster.
  • low mass and adequate strength characteristics can be provided by the use of thin walls and reinforcing ribs preferably formed by investment casting.
  • the ends of the cam lobe contacting surface and the depending walls are preferably semi-circular, and they may also be of any other suitable part-circular shape.
  • an engine 10 with a lifter and cam gallery 12 comprises a camshaft 13 and a plurality of hydraulic valve lifters 14 operated by the camshaft through a plurality of cams 16 having lobes 18.
  • the lifter gallery 20 and cam cover 22 of the lifter and cam gallery 12 may be made of aluminium, cast iron or other suitable material; while the camshaft 13 and hydraulic lifters 14 are preferably made of alloy steel, although other materials may be used.
  • Each hydraulic lifter 14 includes a follower body 23 carrying a conventional hydraulic element assembly or lash adjuster 24 which receives a supply of hydraulic fluid via passages 34 from a passage 36 in one wall of the lifter gallery.
  • the cam-engaging top 38 of the follower body 23 is oblong with semi-circular ends and generally parallel connecting sides.
  • Semi-circular cylindrical end walls 40 depend from the semi-circular ends.
  • the walls 40 are optionally reduced in circumference at their bottom portions 42 to reduce the mass of the lifters.
  • Descending ribs 44 containing the hydraulic passages 34 connect the cylindrical walls 40 with the underside of the cam-engaging top 38.
  • a substantially circular cylindrical depending wall 50 extends from the centre of the follower body 23 to provide a closed-end cylinder for receiving the hydraulic lash adjuster 24.
  • This wall 50 is slightly wider than the top 38 of the follower body 23 and has tapered upper edges 52 (best seen in Figure 5).
  • the lash adjuster or hydraulic element assembly 24 includes a cup-shaped piston 54 which in use engages the top of a valve stem 56.
  • the valve stem 56 is in use urged upwardly (that is, towards the lash adjuster 24) by a compression spring 57 which engages a washer 58 retained on the valve stem by split keepers 59 in the usual manner.
  • a smaller circular cylindrical lash adjuster or even a narrow oblong adjuster could be provided in place of the adjuster 24 so that the width of the cylinder formed by the wall 50 could be made so as to be no greater than the width of the top 38.
  • tapered edges 52 may be omitted, providing lifter 14' with an outwardly bulging oblong flat top 38'.
  • Lifter 60 comprises a follower body 61 reciprocably actuated in a lifter guide (not shown) by a lobe 62 of a camshaft 64.
  • the body 61 is engaged at its bottom by an end 80 of a valve stem 65 which is urged upwardly (that is, towards the follower body 61) by a compression spring 66 retained between a washer 68 held by keepers 70 and a cylinder head wall 72.
  • the upper end 80 of the valve stem 65 carries a lash cap acting as a shim 84 that is received in a recess in the bottom of the follower body 61. Other types of shims could also be used.
  • Oblong openings 92 in the lifter gallery 20 ( Figure 3) or 20' ( Figure 9), are provided to receive reciprocably the lifters 14, 61. These openings may be made by casting, or by drilling three overlapping holes in line and thereafter finishing to size.
  • the openings 92 preferably include small semi-circular ends 94 which are engaged by the end walls 40 of the lifters 14, 14' (or walls 86 of mechanical lifters 60) to carry both the lateral and longitudinal side forces imposed on the lifters in operation.
  • the ends 94 ( Figure 9) are connected by arcs 96 of a larger centre circle.
  • the arcs 96 are spaced with clearance outwardly from the sides of the valve lifters 14, 14' so that all bearing loads are carried by the semi-cylindrical end walls 40. This provides good control of lifter motion and minimizes manufacturing tolerance problems since only the ends 94 of the openings are required to be closely dimensioned.
  • enlarged portions shown as arcs 96 could be formed of any other suitable configuration or could be omitted from the lifter carrier structure if desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP19910203144 1990-12-14 1991-12-02 Ventilstössel Expired - Lifetime EP0490426B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/628,694 US5090364A (en) 1990-12-14 1990-12-14 Two-step valve operating mechanism
US678402 1991-04-01
US07/678,402 US5070827A (en) 1991-04-01 1991-04-01 Low mass valve lifters
US628694 1991-04-01

Publications (2)

Publication Number Publication Date
EP0490426A1 true EP0490426A1 (de) 1992-06-17
EP0490426B1 EP0490426B1 (de) 1994-08-24

Family

ID=27090771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910203144 Expired - Lifetime EP0490426B1 (de) 1990-12-14 1991-12-02 Ventilstössel

Country Status (4)

Country Link
EP (1) EP0490426B1 (de)
JP (1) JP2547495B2 (de)
CA (1) CA2054877C (de)
DE (1) DE69103613T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600609A3 (de) * 2004-05-25 2008-10-15 Schaeffler KG Tassenstössel eines Ventiltriebs einer Brennkraftmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6295721B2 (ja) * 2014-02-28 2018-03-20 三菱自動車工業株式会社 エンジンのバルブ構造

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108238A1 (de) * 1982-10-12 1984-05-16 FIAT AUTO S.p.A. Stössel für Brennkraftmaschinen mit Nockenwellen mit variablen Nockenprofilen
US4637357A (en) * 1985-04-29 1987-01-20 Yamaha Hatsudoki Kabushiki Kaisha Tappet arrangement for engine valve train
EP0267631A1 (de) * 1983-12-07 1988-05-18 Eaton Corporation Hydraulischer Ventilstössel
DE3806839A1 (de) * 1988-03-03 1989-09-14 Bayerische Motoren Werke Ag Lagegesicherter ventilstoessel, insbesondere fuer brennkraftmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863432A (en) * 1957-07-18 1958-12-09 Curtiss Wright Corp Valve tappet mechanism
JPS62154210U (de) * 1986-03-22 1987-09-30

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108238A1 (de) * 1982-10-12 1984-05-16 FIAT AUTO S.p.A. Stössel für Brennkraftmaschinen mit Nockenwellen mit variablen Nockenprofilen
EP0267631A1 (de) * 1983-12-07 1988-05-18 Eaton Corporation Hydraulischer Ventilstössel
US4637357A (en) * 1985-04-29 1987-01-20 Yamaha Hatsudoki Kabushiki Kaisha Tappet arrangement for engine valve train
DE3806839A1 (de) * 1988-03-03 1989-09-14 Bayerische Motoren Werke Ag Lagegesicherter ventilstoessel, insbesondere fuer brennkraftmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600609A3 (de) * 2004-05-25 2008-10-15 Schaeffler KG Tassenstössel eines Ventiltriebs einer Brennkraftmaschine

Also Published As

Publication number Publication date
CA2054877A1 (en) 1992-06-15
DE69103613D1 (de) 1994-09-29
EP0490426B1 (de) 1994-08-24
CA2054877C (en) 1994-06-14
JPH04276103A (ja) 1992-10-01
JP2547495B2 (ja) 1996-10-23
DE69103613T2 (de) 1994-12-22

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