EP0663514B1 - 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 PDFInfo
- Publication number
- EP0663514B1 EP0663514B1 EP95100630A EP95100630A EP0663514B1 EP 0663514 B1 EP0663514 B1 EP 0663514B1 EP 95100630 A EP95100630 A EP 95100630A EP 95100630 A EP95100630 A EP 95100630A EP 0663514 B1 EP0663514 B1 EP 0663514B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker shaft
- hole
- cylinder head
- support walls
- 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.)
- Expired - Lifetime
Links
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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
- F01L1/12—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.
- GB-A-2 037 888 discloses a rocker shaft assembly unit according to the preamble of claim 1. This unit does not require separate supports to be fixed to the cylinder head ; however, positioning the shaft on the cylinder head before screwing the bolts is relatively difficult.
- 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.
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)
Description
Claims (5)
- An assembly unit (9) for a rocker shaft (2) in a cylinder head (1) of a heat engine, including 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 first hole (12), at least one of the other support walls (6, 7) having on its own bearing surface (8) a threaded fastening hole (15), 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 (15), characterised in that said first hole (12) is a reference hole, said unit (9) further comprising a radial pin (11) securely attached to said rocker shaft (2) and co-operating with said reference hole (12).
- 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).
- 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).
- 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).
- A unit according to claim 4, characterised in that said upper surfaces (5a, 6a, 7a) of said support walls (5, 6, 7) are smooth and inclined.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO940023 | 1994-01-18 | ||
IT94TO000023A IT1267984B1 (en) | 1994-01-18 | 1994-01-18 | ASSEMBLY FOR ASSEMBLY OF A ROCKER AXLE ON A CYLINDER HEAD OF AN ICE ENGINE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0663514A1 EP0663514A1 (en) | 1995-07-19 |
EP0663514B1 true 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) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19600441C2 (en) * | 1996-01-09 | 1997-11-27 | Daimler Benz Ag | Cylinder head 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 |
JPH11218007A (en) * | 1998-01-30 | 1999-08-10 | Suzuki Motor Corp | 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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5592005U (en) * | 1978-12-21 | 1980-06-25 | ||
JPS57165612A (en) * | 1981-04-06 | 1982-10-12 | Nissan Motor Co Ltd | Rocker shaft for internal combustion engine |
FR2605047B1 (en) * | 1986-10-01 | 1989-01-27 | Peugeot | ARRANGEMENT OF A ROCKER OF ROCKERS ON A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE. |
-
1994
- 1994-01-18 IT IT94TO000023A patent/IT1267984B1/en active IP Right Grant
-
1995
- 1995-01-13 JP JP00371795A patent/JP3294963B2/en not_active Expired - Fee Related
- 1995-01-18 ES ES95100630T patent/ES2117806T3/en not_active Expired - Lifetime
- 1995-01-18 DE DE69502511T patent/DE69502511T2/en not_active Expired - Lifetime
- 1995-01-18 EP EP95100630A patent/EP0663514B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITTO940023A1 (en) | 1995-07-18 |
JP3294963B2 (en) | 2002-06-24 |
IT1267984B1 (en) | 1997-02-20 |
DE69502511D1 (en) | 1998-06-25 |
DE69502511T2 (en) | 1998-10-22 |
ITTO940023A0 (en) | 1994-01-18 |
JPH07279624A (en) | 1995-10-27 |
EP0663514A1 (en) | 1995-07-19 |
ES2117806T3 (en) | 1998-08-16 |
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