EP0380903B1 - Assemblage pour la distribution d'un moteur à combustion interne, en particulier pour les véhicules à moteurs - Google Patents

Assemblage pour la distribution d'un moteur à combustion interne, en particulier pour les véhicules à moteurs Download PDF

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Publication number
EP0380903B1
EP0380903B1 EP89830553A EP89830553A EP0380903B1 EP 0380903 B1 EP0380903 B1 EP 0380903B1 EP 89830553 A EP89830553 A EP 89830553A EP 89830553 A EP89830553 A EP 89830553A EP 0380903 B1 EP0380903 B1 EP 0380903B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
integral
drive sprocket
seat
chain tensioner
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 - Lifetime
Application number
EP89830553A
Other languages
German (de)
English (en)
Other versions
EP0380903A1 (fr
Inventor
Eppo Ricordi
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0380903A1 publication Critical patent/EP0380903A1/fr
Application granted granted Critical
Publication of EP0380903B1 publication Critical patent/EP0380903B1/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
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • 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
    • F01L1/02—Valve drive
    • 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
    • F01L1/02—Valve drive
    • F01L1/024—Belt drive
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/002—Integrally formed cylinders and cylinder heads
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0535—Single overhead camshafts [SOHC]
    • 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
    • F02B2275/20—SOHC [Single overhead camshaft]

Definitions

  • the present invention relates in general to multi-cylinder internal combustion engines for motor vehicles and more particularly to a timing control assembly for such an engine.
  • the timing control assembly comprises a body within which a camshaft with respective tappets for operating the inlet and exhaust valves is mounted for rotation, and a chain of belt unit for driving the camshaft from the crankshaft of the engine, normally including a drive sprocket coupled to one end of the camshaft and an adjustable chain tensioner.
  • a camshaft with respective tappets for operating the inlet and exhaust valves is mounted for rotation
  • a chain of belt unit for driving the camshaft from the crankshaft of the engine, normally including a drive sprocket coupled to one end of the camshaft and an adjustable chain tensioner.
  • a partial solution to this problem is given in GB-A-557 700, showing a timing control assembly constituted by a preassembly unit in which the body is in one piece and has a continuous flange in a simple plane at the bottom for coupling with a complementary upper flange on the cylinder block, the body having integral bearings for the camshaft and integral seats for the tappets.
  • the object of the present invention is to provide a control assembly of the type defined above which is constituted by a reduced number of parts and which is simpler and cheaper to produce and assemble.
  • the body defines an enlarged portion between the seat for the chain tensioner and the camshaft for housing the drive sprocket of the drive unit, the housing being formed with opposing shoulders for the axial retention of the drive sprocket.
  • the drive sprocket may be fixed to the camshaft by means of a threaded coupling member which is inserted through the chain-tensioner seat during assembly, or by means of axial driving when the shaft is inserted in the body after the sprocket has been positioned between the retaining shoulders of its housing.
  • a 4-cylinder internal combustion engine for a motor car is generally indicated 1 and comprises essentially a cylinder block 2 formed integrally with the cylinders 4 and their respective combustion chambers 4a, intake ducts 5, exhaust ducts 6, seats 7 for the inlet and exhaust valves 8 and seats, not illustrated, for any spark plugs, a sump structure 3 which supports the crankshaft 9 and is fixed to the bottom of the cylinder block 2, and a timing control assembly, generally indicated 10, situated above the cylinder block 2.
  • the timing control assembly 10 is constituted by a preassembled unit constituted by a one-piece body 11 having a continuous integral flange 12 in a single plane at the bottom for joining to a corresponding continuous flange 13 formed in a single plane at the top of the cylinder block 2.
  • the body 11 is formed integrally with bearings 14 in which a camshaft 15 is mounted for rotation, and in its lower part forms integral housings 16 for tappet units 17 which are preferably hydraulic and are associated with the inlet and exhaust valves 8.
  • the body 11 has two end apertures 18, 19 coaxial with the bearings 14, of which the former serves to enable the insertion of the shaft 15 during assembly and is then closed by means of a plug 20.
  • the other end aperture 19 defines an integral seat 20 in correspondence with which is arranged an adjustable chain tensioner device 21 associated with a drive unit 22 for the camshaft 15, which is fitted to the assembly 10 before the latter is joined to the cylinder block 2 of the engine 1.
  • the drive unit 22 includes a driving sprocket 22a which is adapted to be mounted on one end of the crankshaft 9, and a driven sprocket 23 which is rotatable in an integral enlarged portion 24 of the body 11 and is keyed in the manner described below to the end of the camshaft 15, facing the aperture 19.
  • a chain or a toothed belt 25 passes over the sprockets 22a and 23 and can be adjusted by means of the chain tensioner 21.
  • the latter comprises an idle sprocket 26 carried by an arm 27 whose angular position is adjustable by means of a ring 28 which is coupled by means of frontal teeth 28a to a support 30 inserted in the seat 20 and provided with respective frontal teeth 30a.
  • the ring 28 and the support 30 are made fast to the body 11 by the tightening of a screw 29.
  • the driven sprocket 23 is rotatable between a pair of axial positioning and retaining shoulders 31 formed within the enlarged portion 24 and is keyed to the camshaft 15 according to one or other of the two variants shown respectively above and below the axis of the camshaft 15 in Figure 3.
  • the camshaft 15 has an internally-threaded hollow end part 32 into which a flanged retaining member 33 is screwed to clamp the sprocket 23 to the shaft 15.
  • assembly is achieved in the following manner: firstly, the sprocket 23 complete with the chain 25 is positioned in the housing 24 between the two positioning shoulders 31, and then the camshaft 15 is inserted in the body 11 through the aperture 18. The retaining member 33 is then introduced into the body 11 through the aperture 19 and screwed into the hollow end 32 of the shaft 15. Finally, the chain tensioner device 21 and the plug 20 are fitted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Claims (4)

  1. Ensemble (10) de commande de la distribution pour un moteur à combustion interne multicylindrique possédant un bloc cylindre et un vilebrequin, cet ensemble comprenant un corps (11) qui renferme un arbre à cames (15) et les poussoirs (17) respectifs, et une unité (25) à chaîne ou à courroie servant à entraîner l'arbre à cames en prenant son mouvement sur le vilebrequin du moteur, comprenant une roue dentée de transmission (23) couplée à une extrémité de l'arbre à cames et un tendeur de chaîne réglable (21), l'ensemble étant constitué par une unité pré-assemblée (10), dans laquelle le corps (11) est d'une seule pièce et présente dans sa partie basse une bride continue (12) située dans un seul et même plan, pour s'accoupler à une bride supérieure complémentaire (13) prévue sur le bloc cylindres (2), le corps (11) présentant des paliers (14) venus de matière pour l'arbre à cames (15) et des portées (16) venues de matière pour les poussoirs (17), caractérisé en ce que le corps se prolonge axialement de part et d'autre des extrémités de l'arbre à cames et possède deux ouvertures d'extrémité (18, 19) coaxiales aux paliers (14) de l'arbre à cames, une ouverture d'extrémité (19) définissant une portée d'extrémité (20) venue de matière, dans laquelle le tendeur de chaîne (21) est monté, et l'autre ouverture d'extrémité (18) servant pour enfiler l'arbre à cames (15) dans le corps (11) à l'extrémité opposée, par la portée d'extrémité (20) venue de matière.
  2. Ensemble selon la revendication 1, caractérisé en ce que le corps (11) possède une partie agrandie (24) venue de matière, entre la portée (20) du tendeur de chaîne (21) et l'arbre à cames (15), pour loger la roue dentée de transmission (23), le logement (24) étant muni d'un épaulement opposé (31) servant pour le positionnement axial et la retenue de la roue dentée de transmission (23).
  3. Ensemble selon la revendication 2, caractérisé en ce que la roue dentée de transmission (23) est fixée à l'arbre à cames (15) à l'aide d'un élément d'accouplement fileté (33) qui est inséré à travers la portée (20) du tendeur de chaîne (21) au cours de l'assemblage et qui est vissé dans une extrémité creuse correspondante (32) de l'arbre à cames (15) qui est filetée intérieurement.
  4. Ensemble selon la revendication 2, caractérisé en ce que la roue dentée de transmission (23) est fixée à l'arbre à cames (15) par emmanchement axial.
EP89830553A 1988-12-30 1989-12-19 Assemblage pour la distribution d'un moteur à combustion interne, en particulier pour les véhicules à moteurs Expired - Lifetime EP0380903B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6817888 1988-12-30
IT68178/88A IT1224052B (it) 1988-12-30 1988-12-30 Complesso di comando della distribuzione per un motore a combustione interna pluricilindrico particolarmente per autoveicoli

Publications (2)

Publication Number Publication Date
EP0380903A1 EP0380903A1 (fr) 1990-08-08
EP0380903B1 true EP0380903B1 (fr) 1993-04-14

Family

ID=11308353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830553A Expired - Lifetime EP0380903B1 (fr) 1988-12-30 1989-12-19 Assemblage pour la distribution d'un moteur à combustion interne, en particulier pour les véhicules à moteurs

Country Status (5)

Country Link
EP (1) EP0380903B1 (fr)
BR (1) BR8906871A (fr)
DE (1) DE68906014T2 (fr)
ES (1) ES2039940T3 (fr)
IT (1) IT1224052B (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB557700A (en) * 1942-05-22 1943-12-01 Harold Raymond Morgan A housing for the valve-gear of an internal combustion engine
FR1515767A (fr) * 1966-10-20 1968-03-01 Dispositif corrigeant automatiquement la distribution dans les moteurs à quatre temps
DE3406100A1 (de) * 1984-02-18 1985-08-22 Willi 7171 Michelfeld Roth Drehzahlabhaengige verstellung der ventilsteuerzeiten bei verbrennungsmotoren

Also Published As

Publication number Publication date
DE68906014T2 (de) 1993-07-22
IT1224052B (it) 1990-09-26
ES2039940T3 (es) 1993-10-01
EP0380903A1 (fr) 1990-08-08
IT8868178A0 (it) 1988-12-30
DE68906014D1 (de) 1993-05-19
BR8906871A (pt) 1990-09-25

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