EP0434638A1 - Moteur à combustion interne à allumage commandé et double arbre à cames en tête pour véhicules motorisés - Google Patents

Moteur à combustion interne à allumage commandé et double arbre à cames en tête pour véhicules motorisés Download PDF

Info

Publication number
EP0434638A1
EP0434638A1 EP90830555A EP90830555A EP0434638A1 EP 0434638 A1 EP0434638 A1 EP 0434638A1 EP 90830555 A EP90830555 A EP 90830555A EP 90830555 A EP90830555 A EP 90830555A EP 0434638 A1 EP0434638 A1 EP 0434638A1
Authority
EP
European Patent Office
Prior art keywords
head
camshafts
internal combustion
motor vehicles
combustion engine
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.)
Withdrawn
Application number
EP90830555A
Other languages
German (de)
English (en)
Inventor
Francesco Ferrazzi
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 EP0434638A1 publication Critical patent/EP0434638A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F01L1/04—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
    • 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
    • F01L2001/0476—Camshaft bearings
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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

  • the present invention relates in general to internal combustion engines with controlled ignition for motor vehicles.
  • the invention concerns an engine with two overhead camshafts arranged side by side and having respective journals supported for rotation from below by corresponding bearings in the engine head and from above by caps fixed to the head, and in which the head is arranged to house spark plugs for the engine.
  • each pair of caps associated with homologous journals of the two camshafts as a single piece having a body with a central hole for the passage of a corresponding spark plug.
  • the body has a pair of holes for screws for fixing it to the head in the outer ends of the caps and a further pair of holes for screws for fixing it to the head in two appendages of the body formed on radially opposite sides of the hole for the passage of the spark plug.
  • the object of the present invention is further to simplify the construction and assembly of the engine and to achieve more effective retention of the two camshafts in correspondence with the plugs without problems of bulk, even in engines with valves in a narrow V arrangement.
  • this object is achieved by virtue of the fact that a hollow bush for fixing centrally to the head is engaged in the central hole in the body forming each pair of caps and is screwed into the corresponding hole for the fitting of the spark plug.
  • the head of an internal combustion engine with controlled ignition for motor vehicles is indicated 1 and is intended to be fixed to the top of the cylinder block by means of bolts 2.
  • the head 1 defines inlet and exhaust ducts (not shown) for the cylinders, respective valve seats (not shown) having a narrow V arrangement, and central holes 19 for the fitting of the spark plugs of the engine.
  • the top of the head 1 has bearing parts 3 for the journals 4 of a pair of camshafts 5 arranged side by side.
  • the journals 4 of the two camshafts 5 are retained from above by caps 6 fixed to the head 1 in the manner explained below and enclosed within a head cover 1a.
  • the caps 6 associated with each homologous pair of journals 4 of the two camshafts 5 are formed as a single piece with a body 7 having a wider central portion 8 with a cylindrical through-hole 9 for the passage of a corresponding spark plug, not shown, of the engine.
  • Each body 7 is fixed laterally to the head 1 by a pair of screws 10 inserted in corresponding holes 11 at the outer ends of the two caps 6.
  • the body 7 is fixed centrally to the head 1 by a hollow bush 15 engaged in the through-hole 9 in the wider portion 8.
  • the upper end of the bush 15 has a wider head 16 for bearing on the top of the wider portion 8 and its lower end has an externally-threaded portion 17 which is screwed into a corresponding internal thread 18 in the upper region of the hole 19 in the head 1 in which the respective spark plug is inserted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP90830555A 1989-12-22 1990-11-27 Moteur à combustion interne à allumage commandé et double arbre à cames en tête pour véhicules motorisés Withdrawn EP0434638A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT06816689A IT1237732B (it) 1989-12-22 1989-12-22 Motore a combustione interna ad accensione comandata con doppio albero a camme in testa per autoveicoli.
IT6816689 1989-12-22

Publications (1)

Publication Number Publication Date
EP0434638A1 true EP0434638A1 (fr) 1991-06-26

Family

ID=11308290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90830555A Withdrawn EP0434638A1 (fr) 1989-12-22 1990-11-27 Moteur à combustion interne à allumage commandé et double arbre à cames en tête pour véhicules motorisés

Country Status (2)

Country Link
EP (1) EP0434638A1 (fr)
IT (1) IT1237732B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2960478A1 (fr) * 2014-06-25 2015-12-30 Toyota Jidosha Kabushiki Kaisha Structure de palier d'arbre à cames
EP3379064A1 (fr) * 2017-03-22 2018-09-26 Honda Motor Co., Ltd. Culasse de moteur à combustion interne

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344597A2 (fr) * 1988-06-01 1989-12-06 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Culasse pour moteur à combustion interne

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0344597A2 (fr) * 1988-06-01 1989-12-06 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Culasse pour moteur à combustion interne

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2960478A1 (fr) * 2014-06-25 2015-12-30 Toyota Jidosha Kabushiki Kaisha Structure de palier d'arbre à cames
CN105317489A (zh) * 2014-06-25 2016-02-10 丰田自动车株式会社 凸轮轴轴承结构
EP3379064A1 (fr) * 2017-03-22 2018-09-26 Honda Motor Co., Ltd. Culasse de moteur à combustion interne
US10900441B2 (en) 2017-03-22 2021-01-26 Honda Motor Co., Ltd. Cylinder head of internal combustion engine

Also Published As

Publication number Publication date
IT1237732B (it) 1993-06-15
IT8968166A0 (it) 1989-12-22

Similar Documents

Publication Publication Date Title
US4553515A (en) Cylinder head for spark ignition internal combustion engine
JPH0581723B2 (fr)
JPS60216011A (ja) 内燃機関のカム軸保持構造
US4796574A (en) SOHC type internal combustion engine
EP1243780A2 (fr) Moteur à combustion interne
US4534325A (en) Cam shaft holding system for internal combustion engine
US4762099A (en) Valve actuating device of four-cycle internal combustion engine
US5704330A (en) Cylinder head arrangement for internal combustion engine
EP0434638A1 (fr) Moteur à combustion interne à allumage commandé et double arbre à cames en tête pour véhicules motorisés
US5119776A (en) Compact bearing cap for overhead camshaft
US4223647A (en) Slanted internal combustion engine
CN100465414C (zh) 发动机
JP2584601B2 (ja) 内燃機関の動弁装置
US6895925B2 (en) Internal combustion engine having three valves per cylinder
JPH027210Y2 (fr)
EP0713958B1 (fr) Moteur à combustion interne
JP2634799B2 (ja) 内燃機関の動弁機構
JP2695151B2 (ja) 内燃機関の動弁機構
JPH0640892Y2 (ja) シリンダヘッドの油溜め構造
JP3591277B2 (ja) シリンダヘッド構造
EP0380903B1 (fr) Assemblage pour la distribution d'un moteur à combustion interne, en particulier pour les véhicules à moteurs
JP3275774B2 (ja) エンジンのカムキャップ構造
JPS642780B2 (fr)
JPH0636247Y2 (ja) 内燃機関におけるカム軸用軸受の潤滑装置
JPS63176607A (ja) 多気筒四サイクルエンジンの動弁装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19911228