EP0663514A1 - Assembly unit for a rocker shaft in a cylinder head of a heat engine - Google Patents

Assembly unit for a rocker shaft in a cylinder head of a heat engine Download PDF

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Publication number
EP0663514A1
EP0663514A1 EP95100630A EP95100630A EP0663514A1 EP 0663514 A1 EP0663514 A1 EP 0663514A1 EP 95100630 A EP95100630 A EP 95100630A EP 95100630 A EP95100630 A EP 95100630A EP 0663514 A1 EP0663514 A1 EP 0663514A1
Authority
EP
European Patent Office
Prior art keywords
rocker shaft
support walls
cylinder head
hole
assembly unit
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
EP95100630A
Other languages
German (de)
French (fr)
Other versions
EP0663514B1 (en
Inventor
Domenico Palmisani
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.)
Iveco SpA
Original Assignee
Iveco Fiat 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 Iveco Fiat SpA filed Critical Iveco Fiat SpA
Publication of EP0663514A1 publication Critical patent/EP0663514A1/en
Application granted granted Critical
Publication of EP0663514B1 publication Critical patent/EP0663514B1/en
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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0046—Shape of casings adapted to facilitate fitting or dismantling of engine parts

Definitions

  • the present invention relates to an assembly unit for a rocker shaft in a cylinder head of a heat engine.
  • an assembly unit for a rocker shaft in a cylinder head of a heat engine characterised in that it comprises a plurality of support walls extending integrally with said cylinder head and transversely to said rocker shaft and disposed between each pair of adjacent cylinders and at the sides of the end cylinders, said support walls defining respective bearing surfaces for said rocker shaft, one of said walls having in its own bearing surface a reference hole, at least one of the other support walls having on its own bearing surface a threaded fastening hole, said unit further comprising a radial pin securely attached to said rocker shaft and co-operating with said reference hole, and at least one fastening screw engaging in a respective diametral hole passing through said rocker shaft and screwed into said fastening hole.
  • the reference numeral 1 denotes a cylinder head of a heat engine, on which is mounted a rocker shaft 2 intended to define, in operation, a pivot axis for a plurality of rockers (not shown) for actuating the valves of the engine (also not shown).
  • the areas of the head 1 situated in alignment with the engine cylinders (not shown) are designated C and are indicated schematically in dashed line; with a view to greater clarity the valve seats and injectors associated with each cylinder are not shown in the drawing, since they are not necessary for comprehension of the present invention.
  • the head 1 has an upwardly projecting peripheral portion which substantially comprises a pair of longitudinal side walls 3, 4 and a pair of end walls 5, 6 disposed transversely to the shaft 2 and situated on the opposite sides of the end cylinders.
  • the head 1 also has a plurality of intermediate transverse walls 7 which are integral with the wall 3 and which are each interposed between a respective pair of adjacent cylinders.
  • the end walls 5, 6 and the intermediate walls 7 have respective coaxial through-holes 20 to accommodate a camshaft (not shown) and they form supports for the rocker shaft 2 forming part of an assembly unit 9 in accordance with the present invention.
  • the walls 5, 6 and 7 have respective upper surfaces 5a, 6a, 7a which are substantially smooth and are inclined downwardly from the wall 3 towards the wall 4; in each of said upper surfaces there is provided a concave seating 8 of cylindrical profile and with a transverse axis with respect to the walls 5, 6, 7, thus forming a respective bearing surface for the rocker shaft 2.
  • the assembly unit 9 further comprises a pin 11 extending radially from the rocker shaft 2 in the vicinity of one axial end 10 thereof.
  • the pin 11 engages in a corresponding hole 12 provided in the seating 8 of the end wall 5.
  • the rocker shaft 2 is also secured to the head 1 by means of a plurality of screws 13 (only two of which are shown) which engages in respective diametral through-holes 14 in the rocker shaft itself and are screwed into threaded 15 holes provided in the respective seatings 8 of the end wall 6 and of the intermediate walls 7.
  • the rocker shaft 2 is provided with respective milled portions 16 defining a flat bearing surface for the respective heads 17 of the screws 13; the latter are provided with a shank formed by a cylindrical portion adjoining the head 17 and engaging with the smallest possible radial clearance in the respective hole 14 in the rocker shaft 2, and by a threaded end portion 19 screwed into the corresponding hole 15.
  • the assembly of the rocker shaft 2 takes place as follows.
  • the rockers (not shown) are initially mounted on the shaft 2; then the shaft 2 is mounted on the seatings 8 in such a way that the pin 11 engages in the respective reference hole 12.
  • This engagement provides an axial and angular restraint for the shaft 2 and, therefore, defines the location of the shaft itself.
  • the axes of the holes 14 coincide with those of the holes 15 in the walls 6 and 7 and, therefore, it is sufficient to screw down the respective screws 13 to complete the assembly.

Abstract

An assembly unit (9) for a rocker shaft (2) in a cylinder head (1) of a heat engine, comprising a plurality of transverse support walls (5, 6, 7) integral with said cylinder head (1) and disposed between each pair of adjacent cylinders and at the sides of the end cylinders of the engine, a radial pin (11) integral with the rocker shaft (2) and co-operating with a respective reference hole (12) provided in a bearing surface (8) of one of the support walls (5), and a plurality of screws (13) for fastening the rocker shaft (2) to respective bearing surfaces (8) of the other respective support walls (6, 7).

Description

  • The present invention relates to an assembly unit for a rocker shaft in a cylinder head of a heat engine.
  • It is known to mount a rocker shaft on a cylinder head by means of supports fixed to the head itself and provided with respective through-seatings for accommodating the shaft itself. Supports of this type are generally connected to the head by means of screws.
  • This solution has a number of drawbacks.
  • In particular, the assembly operations are relatively long and complicated; furthermore, rather high costs are incurred in machining the supports.
  • It is the object of the present invention to devise an assembly unit for a rocker shaft in a cylinder head of a heat engine, which enables the aforementioned drawbacks to be obviated.
  • Said object is achieved by the present invention in that it relates to an assembly unit for a rocker shaft in a cylinder head of a heat engine, characterised in that it comprises a plurality of support walls extending integrally with said cylinder head and transversely to said rocker shaft and disposed between each pair of adjacent cylinders and at the sides of the end cylinders, said support walls defining respective bearing surfaces for said rocker shaft, one of said walls having in its own bearing surface a reference hole, at least one of the other support walls having on its own bearing surface a threaded fastening hole, said unit further comprising a radial pin securely attached to said rocker shaft and co-operating with said reference hole, and at least one fastening screw engaging in a respective diametral hole passing through said rocker shaft and screwed into said fastening hole.
  • With a view to a better understanding of the present invention a preferred form of embodiment will be described non-restrictively by way of example below, with reference to the accompanying drawing which illustrates an exploded view thereof in perspective.
  • Referring now to the Figure, the reference numeral 1 denotes a cylinder head of a heat engine, on which is mounted a rocker shaft 2 intended to define, in operation, a pivot axis for a plurality of rockers (not shown) for actuating the valves of the engine (also not shown). The areas of the head 1 situated in alignment with the engine cylinders (not shown) are designated C and are indicated schematically in dashed line; with a view to greater clarity the valve seats and injectors associated with each cylinder are not shown in the drawing, since they are not necessary for comprehension of the present invention.
  • The head 1 has an upwardly projecting peripheral portion which substantially comprises a pair of longitudinal side walls 3, 4 and a pair of end walls 5, 6 disposed transversely to the shaft 2 and situated on the opposite sides of the end cylinders. The head 1 also has a plurality of intermediate transverse walls 7 which are integral with the wall 3 and which are each interposed between a respective pair of adjacent cylinders.
  • The end walls 5, 6 and the intermediate walls 7 have respective coaxial through-holes 20 to accommodate a camshaft (not shown) and they form supports for the rocker shaft 2 forming part of an assembly unit 9 in accordance with the present invention.
  • The walls 5, 6 and 7 have respective upper surfaces 5a, 6a, 7a which are substantially smooth and are inclined downwardly from the wall 3 towards the wall 4; in each of said upper surfaces there is provided a concave seating 8 of cylindrical profile and with a transverse axis with respect to the walls 5, 6, 7, thus forming a respective bearing surface for the rocker shaft 2.
  • The assembly unit 9 further comprises a pin 11 extending radially from the rocker shaft 2 in the vicinity of one axial end 10 thereof. The pin 11 engages in a corresponding hole 12 provided in the seating 8 of the end wall 5.
  • The rocker shaft 2 is also secured to the head 1 by means of a plurality of screws 13 (only two of which are shown) which engages in respective diametral through-holes 14 in the rocker shaft itself and are screwed into threaded 15 holes provided in the respective seatings 8 of the end wall 6 and of the intermediate walls 7.
  • Advantageously, the rocker shaft 2 is provided with respective milled portions 16 defining a flat bearing surface for the respective heads 17 of the screws 13; the latter are provided with a shank formed by a cylindrical portion adjoining the head 17 and engaging with the smallest possible radial clearance in the respective hole 14 in the rocker shaft 2, and by a threaded end portion 19 screwed into the corresponding hole 15.
  • The assembly of the rocker shaft 2 takes place as follows. The rockers (not shown) are initially mounted on the shaft 2; then the shaft 2 is mounted on the seatings 8 in such a way that the pin 11 engages in the respective reference hole 12. This engagement provides an axial and angular restraint for the shaft 2 and, therefore, defines the location of the shaft itself. The axes of the holes 14 coincide with those of the holes 15 in the walls 6 and 7 and, therefore, it is sufficient to screw down the respective screws 13 to complete the assembly.
  • The advantages achieved with the present invention are apparent from a study of the features of the assembly unit 9 designed in accordance with therewith. In particular, the mounting of the rocker shaft 2 on the head 1 is carried out rapidly and accurately, thereby eliminating all the additional costs associated with the formation of conventional supports.
  • Finally, it is evident that the assembly unit 9 described can be subject to modifications and variants which do not depart from the scope of protection of the present invention.

Claims (5)

  1. An assembly unit (9) for a rocker shaft (2) in a cylinder head (1) of a heat engine, characterised in that it comprises a plurality of support walls (5, 6, 7) extending integrally with said cylinder head (1) and transversely to said rocker shaft (2) and disposed between each pair of adjacent cylinders and at the sides of the end cylinders, said support walls (5, 6, 7) defining respective bearing surfaces (8) for said rocker shaft (2), one of said walls (5) having in its own bearing surface (8) a reference hole (12), at least one of the other support walls (6, 7) having on its own bearing surface (8) a threaded fastening hole (15), said unit (9) further comprising a radial pin (11) securely attached to said rocker shaft (2) and co-operating with said reference hole (12), and at least one fastening screw (13) engaging in a respective diametral hole (14) passing through said rocker shaft (2) and screwed into said fastening hole.
  2. A unit according to claim 1, characterised in that said fastening screw (13) comprises a shank provided with a cylindrical portion (18) engaging in said respective diametral through-hole (14) in said rocker shaft (2), and a threaded portion (19) screwed into said fastening hole (15).
  3. A unit according to claim 1 or 2, characterised in that it comprises a plurality of screws (13) for fastening said rocker shaft (2) to each of said other support walls (6, 7).
  4. A unit according to any one of the preceding claims, characterised in that said bearing surfaces are defined by concave seatings (8) provided on respective upper surfaces (5a, 6a, 7a) of said support walls (5, 6, 7).
  5. A unit according to claim 1, characterised in that said upper surfaces (5a, 6a, 7a) of said support walls (5, 6, 7) are smooth and inclined.
EP95100630A 1994-01-18 1995-01-18 Assembly unit for a rocker shaft in a cylinder head of a heat engine Expired - Lifetime EP0663514B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT94TO000023A IT1267984B1 (en) 1994-01-18 1994-01-18 ASSEMBLY FOR ASSEMBLY OF A ROCKER AXLE ON A CYLINDER HEAD OF AN ICE ENGINE.
ITTO940023 1994-01-18

Publications (2)

Publication Number Publication Date
EP0663514A1 true EP0663514A1 (en) 1995-07-19
EP0663514B1 EP0663514B1 (en) 1998-05-20

Family

ID=11412039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95100630A Expired - Lifetime EP0663514B1 (en) 1994-01-18 1995-01-18 Assembly unit for a rocker shaft in a cylinder head of a heat engine

Country Status (5)

Country Link
EP (1) EP0663514B1 (en)
JP (1) JP3294963B2 (en)
DE (1) DE69502511T2 (en)
ES (1) ES2117806T3 (en)
IT (1) IT1267984B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743392A1 (en) * 1996-01-09 1997-07-11 Daimler Benz Ag CYLINDER CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
US5778842A (en) * 1996-05-08 1998-07-14 Ina Walzlager Schaeffler Kg Actuating lever for a valve drive of an internal combustion engine
CN1103404C (en) * 1998-01-30 2003-03-19 铃木株式会社 Shaft-assembling structure for internal combustion engine
CN102242649A (en) * 2011-07-26 2011-11-16 奇瑞汽车股份有限公司 Rock arm shaft

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2037888A (en) * 1978-12-21 1980-07-16 Nissan Motor Rocker Shaft Fixing Arrangement for Internal Combustion Engines
JPS57165612A (en) * 1981-04-06 1982-10-12 Nissan Motor Co Ltd Rocker shaft for internal combustion engine
EP0263734A1 (en) * 1986-10-01 1988-04-13 Automobiles Peugeot Rocker arm arrangement on an internal-combustion engine cylinder head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2037888A (en) * 1978-12-21 1980-07-16 Nissan Motor Rocker Shaft Fixing Arrangement for Internal Combustion Engines
JPS57165612A (en) * 1981-04-06 1982-10-12 Nissan Motor Co Ltd Rocker shaft for internal combustion engine
EP0263734A1 (en) * 1986-10-01 1988-04-13 Automobiles Peugeot Rocker arm arrangement on an internal-combustion engine cylinder head

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 5 (M - 184) 11 January 1983 (1983-01-11) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743392A1 (en) * 1996-01-09 1997-07-11 Daimler Benz Ag CYLINDER CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE
US5778842A (en) * 1996-05-08 1998-07-14 Ina Walzlager Schaeffler Kg Actuating lever for a valve drive of an internal combustion engine
DE19618416C2 (en) * 1996-05-08 2003-11-13 Ina Schaeffler Kg Thru axis of an actuating lever for a valve train of an internal combustion engine
CN1103404C (en) * 1998-01-30 2003-03-19 铃木株式会社 Shaft-assembling structure for internal combustion engine
CN102242649A (en) * 2011-07-26 2011-11-16 奇瑞汽车股份有限公司 Rock arm shaft

Also Published As

Publication number Publication date
ITTO940023A0 (en) 1994-01-18
ES2117806T3 (en) 1998-08-16
EP0663514B1 (en) 1998-05-20
ITTO940023A1 (en) 1995-07-18
DE69502511T2 (en) 1998-10-22
JPH07279624A (en) 1995-10-27
JP3294963B2 (en) 2002-06-24
IT1267984B1 (en) 1997-02-20
DE69502511D1 (en) 1998-06-25

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