GB2072746A - Lubricating i.c. engine overhead camshafts - Google Patents
Lubricating i.c. engine overhead camshafts Download PDFInfo
- Publication number
- GB2072746A GB2072746A GB8107318A GB8107318A GB2072746A GB 2072746 A GB2072746 A GB 2072746A GB 8107318 A GB8107318 A GB 8107318A GB 8107318 A GB8107318 A GB 8107318A GB 2072746 A GB2072746 A GB 2072746A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oil
- camshaft
- cylinder head
- tappet
- lubricating oil
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/101—Lubrication of valve gear or auxiliaries of cam surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
- F01M9/104—Lubrication of valve gear or auxiliaries of tappets
-
- 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
- F02B2275/20—SOHC [Single overhead camshaft]
Abstract
Oil collecting basins 16 adjacent the tappet guides 14 collect excess oil exuded from the guides and the basins have holes 18 aligned with the cams on the camshaft 7 to drip oil thereon. Inserts 18 may be used in the oil drip holes, or cast drip edges located adjacent the holes. The rocker arm fulcrum (29), Fig. 4 (not shown), is lubricated by oil fed through grooves (33) in the fulcrum surface engaged by the fulcrum locating nut (28). <IMAGE>
Description
SPECIFICATION
Cylinder head for an internal-combustion engine
The invention relates to a cylinder head for an
internal combustion engine of the type having a
hemispherically or dome-shaped combustion
chamber with intake and exhaust valves arranged
approximately radially to its surface. The valves are
operable by sheet metal rocker arms actuated by
tappets engaged directly with the cams of an over
head camshaft. The camshaft is arranged symetri
cally between the intake and exhaust valve trains.
Bridges span the camshaft adjacent to the camshaft
bearing webs, and are formed from the cylinder
head projections or bosses that accommodate the
valve stem guides, the rocker arm stud mounting
holes, and the tappet guides.
A cylinder head of the type broadly described
above is shown and described in U.S. Patent
3,164,143. in the patent, the area of lhe sylinder head
extending beneath the camshaft is of a tank-shaped
construction. This permits excess lubricating oil that
runs off from the tappet guides, which generally are
supplied with an excess of lubricating oil under
pressure, to accumulate, forming a lubricating oil
sump for the camshaft. The usual drainage orifices
from this lubricating oil sump are located to provide
an oil level build up that will assure the cam surfaces
of the camshaft being wetted by the dip lubrication
method. Lubrication of the rocker arm bearing
pieces, therefore, in the patent is intended to be
achieved by the splash oil occurring in the valve gear
space.
In an internal combustion engine, if hydraulic
valve tappets are adopted, which automatically
compensate for play in the valve gear, then it is
important to control the amount of airthat is added
to the lubricating oil delivered by the oil pump to the F engine.
The lubrication of the valve gear of an internal
combustion engine by pressure lubrication and dip
and splash lubrication hitherto practiced leads
inevitably to higher proportions of air in the lubricat
ing oil. This results either in an impairment of effec
tiveness of the hydraulic valve tappets or, alterna
tively, the adoption of onerous measures to calm the
lubricating oil.
It is an object of the invention to provide an
improved construction of a cylinder head for an
internal combustion engine of the type initially defined so that the hitherto customary dip and
splash lubrication of parts of the valve gear of the
internal combustion engine can be eliminated. The
invention provides oii collector basins adjacent each
of the tappet guides and discharges it through oil
drainage holes aligned with portions of the corres
ponding cams of the camshaft. This achieves very
reliable lubrication of the camshaft and furthermore
reduces to a minimum the inclusion of air in the lub
ricating oil.
As a modification, spout-like inserts may be pres
sed into the oil drainage holes, the inserts consisting
of thin walled tubes so that the ends constitute in
effect sharp edges to ensure an aimed dripping of the lubricating oil onto the corresponding cams of the camshaft.
Other features include lubricating oil channels connected from the tappet guides to those sections of the rocker arm stud mounting bores located above the screwthreads, radial lubricating oil grooves in the rocker arm fulcrum bearing surface loaded by the nut, and lubrication of the rocker arm lower bearing surface while avoiding oil splashes that cause air inclusions. Also, the area in the cylinder head that lies beneath the camshaft communicates by lubricating oil drainage orifices with oil return channels, and, therefore, eliminates the need for camshaft lubricating oil sump.
Other objects, featu resand advantages Of the invention will become more apparent upon reference to the succeeding, detailed description thereof, and to the drawings illustrating the preferred embodiments thereof; wherein,
Figure lisa plan view of an internal combustion engine cylinder head embodying the invention; Figure-2- is vertical cross-sectional view made along the line ll-ll in Figure 1;
Figure 3 is an enlarged cross-sectional view of a detail of Figure 2;
Figure 3a is a cross-sectional view of a modification of the Figure 2 showing; and
Figure 4 is a vertical cross-sectional view made along the line ill-lll in Figure 1.
Figures 1 and/or 2 illustrate a cylinder head 1 for an internal combustion engine that is formed with a hemispherically or dome-shaped combustion chamber 2, mutually communicating cooling medium spaces 3, intake and exhaust passages (only partly shown) located between the cooling spaces and controlled by intake and exhaust valves 4 and 5, respectively, and a spark plug bore accommodating a spark plug 6.
An overhead mounted camshaft 7 extends parallel to the longitudinal direction or axis of the internal combustion engine and is rotatably mounted in a plurality of camshaft bearing webs 8 (Figure 1). Adjacent to the camshaft bearing webs 8 are formed bridges 15 that span the camshaft 7 and extend from the bosses or projections that accommodate the valve stem guides 9 and 10, the rocker arm fulcrum mounting stud bores 11 and 12, and the tappet guides 13 and 14.
Formed in the bridges 15 adjacent each of the tappet guides 13 and 14 are oil collector basins 16 and 17. The lattercollectthe excess lubricating oil that normally is exuded from the tappet guides 13 and 14 during reciprocation ofthetappets. The tappets are supplied with oil from an oil pump, not shown, in a known manner. This oil from the tappet guides is discharged through oil discharge holes 18 (Figure 3) formed in each of the basins and vertically aligned with portions of the corresponding cams on the camshaft 7. Pressed into the oil discharge bores 18 may be oil passage inserts 19 that consist of a thin sheet metal tube or the like, the ends 22 of which project beyond the bottom wall of the bridge member. This ensures an aimed dripping of the lubricating oil onto the corresponding cams of the camshaft 7.
The oil passage inserts 19 in this case may be con
structed as a polygonal tube, for example, and have
flared or funnel-like conical portions 21 at their upper
ends and drip lip type edges 22 at their lower ends.
Figures 1 and 2 show that lubricating oil exuding
from the top of the tappet guide bore 14 will run
down the outsides of the cylinder head boss and
accumulate in the oil collector basins 16 and 17.
From there, it can drip through the oil passage
inserts 19 into the cams of the revolving camshaft 7.
It will also be seen that the open area 23 extending
beneath the camshaft 7 returns the lubricating oil in
this area to the crankcase (not shown) through con necking lubricatingsiLreturrwhannelsN ancI24Th alternate construction of the invention is
shown in Figure 3a in which a molded drip lip 18' is
integrally shaped in the casting of the cylinder head
in a mannerto intersect the adjacent oil discharge
bore 18 and thus form a drip edge. It is likewise poss isle to produce the oil passage inserts 19' (Figure 3) from a plastics materiai, in which case the inserts can be prevented from accidental fatlingout of or being displaced from the oil discharge bores 18 by one or more flexible retaining lips 20'.
Figure 4 illustrates a further feature of a cylinder
head constructed according to the invention. In this case, the bore communicates with a lubricating oil channel 25 that connects to the screw-thread portion
of the bore 26 in which is mounted the rocker arm
fulcrum supporting stud 27. The stud 27 screwed
into bore 11 tensions, through a nut 28, the semi
cylindrical rocker arm bearing piece or fulcrum 29
against a step or offset 30 of the bore. Biased or
forced against the rocker arm bearing piece 29 is a
sheet metal rocker arm 31, one end of which is
engaged by a hydraulic tappet 32, and the other end
bearing against the stem of the valve 4.The lubrication of the semi-cylindrical surfaces between the
rocker arm fulcrum 29 and the corresponding bush
ing in the sheet metal rocker arm 31 is particularly essential and is ensured according to the invention
by radial lubricating oil grooves 33 in the plane surface of the rocker arm fulcrum 29 at the point loaded
by the nut 28. Due to the loading of the bore 11 of the
stud 27 with lubricating oil under pressure, lubricat
ing oil can climb up the central bore of the rocker
arm bearing piece 29 and be guided at the nut 28
through the radial lubricating oil grooves 33 to the
lateral portions of the rocker arm 31, from where it
passes onto the bushing surfaces of the rocker arm
31.
From the foregoing, it will be seen that compo
nents of the valve gear of the internal combustion
engine are adequately lubricated by specific meas
ures so that the hitherto customary dip lubrication or
oil splash lubrication method of lubrication can be
abandoned, which will result in lubricating oil in the
entire lubricating oil circuit of the internal combus
tion engine being kept as free as possible from air
inclusions.
While the invention has been shown and
described in its preferred embodiments, it will be
clear to those skilled in the arts to which it pertains
that many changes and modifications may be made
thereto without -ue;:arting from the scope of the
invention.
Claims (6)
1. A cylinder head for an internal combustion
engine having a dome-shaped combustion chamber
with intake and exhaust valves arranged approxi
mately radial to the surface of the chamber and
symetrically located on opposite sides of a single
overhead camshaft for individual actuation by one end of a rocker arm that is pivotally mounted to the
head by a stud, the rocker arm being operably
engaged at its opposite end by a tappet movable by
the camshaft, and bridge members spanning the
camshaft and pro-viding mounting bores for the
studs, and providillg tappet guides slidably accom modating the tappets therein, the tappet guides
receiving lubricatin!g oil therein that is exuded from the guides during m ovement of the tappet by the camshaft, characteri.7ed by,
an oil collecting basin adjacent a tappet guide for collecting oil exuded t herefrom, the basin having dischargehotethernin vertically aligned with a por on of a cam on the car shaft so as to drip oil on the cam to lubricate the carn.
2. Acylinderhead al3cording to Claim 1, characterized in that on the underside of the oil collector
basin adjacentthe holethe cylinder head is formed with a drip edge onto which the oil flows to ensure
an aimed dripping of the I ubricating oil onto a cam of the camshaft.
3 A cylinder head acscWrding to Claims 1 or 2,
characterized in that the oil discharge hole receives
therein a tubular insert defining an oil passage and
having a flared upper end constructed as a conical
funnel, and a lower edge constructed as a drip edge
projecting out beyond the lowerwall ofthe bridge member two ensure an aimed dripping ofthe lubicat- ing oil onto a cam of the camshaft.
4. A cylinder head according to Claims 1 or 2,
characterized in that the oil discharge hole receives
therein an insert defining an cil passage that is sec
ured against accidental withdrawal from the hole by
a retaining lip, one end of the insert being formed to
ensure an airned dripping of the lubricating oil onto
a cam of the camshaft.
5 A cylinder head according to Claims 1 or 2 including a lubricating oil channel connecting the
tappet guide oil to a portion of the stud bore for
lubricating the same, and the pivotal mounting of
the rocker arm to the stud including fulcrum means,
and a nut securing the fulcrum means to the stud,
and a radial lubricating oil groove connecting the
stud bore to the surface of the fulcrum means loaded by the nut.
6. A cylinder head according to Claims 1 or 2,
characterized in that the portion of the head extend
ing beneath the camshaft communicates through
lubricating oil discharge orifices with a lubricating oil
return channel removing the oil therein to other
parts of the engine.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803009062 DE3009062C2 (en) | 1980-03-08 | 1980-03-08 | Cylinder head for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2072746A true GB2072746A (en) | 1981-10-07 |
GB2072746B GB2072746B (en) | 1983-08-10 |
Family
ID=6096707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8107318A Expired GB2072746B (en) | 1980-03-08 | 1981-03-09 | Lubricating ic engine overhead camshafts |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS56126608A (en) |
CA (1) | CA1156527A (en) |
DE (1) | DE3009062C2 (en) |
GB (1) | GB2072746B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59136510A (en) * | 1983-01-26 | 1984-08-06 | Nissan Motor Co Ltd | Valve moving system supporting device of multi-cylinder internal combustion engine |
DE4446488C1 (en) * | 1994-12-23 | 1996-06-05 | Daimler Benz Ag | Valve control for an internal combustion engine |
DE102004050056A1 (en) * | 2004-10-14 | 2006-04-27 | Bayerische Motoren Werke Ag | Machine housing for internal combustion engine has housing which exhibits wall and in installed position, it exhibits one support and is subjected to lubricant whereby lubricant is arranged in sections at support |
JP4625425B2 (en) * | 2006-05-22 | 2011-02-02 | 本田技研工業株式会社 | Cylinder head oil passage structure |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3164143A (en) * | 1964-03-11 | 1965-01-05 | Dolza John | Internal combustion engine |
IT1047395B (en) * | 1975-10-09 | 1980-09-10 | Fiat Veicoli Ind | INTERNAL COMBUSTION ENGINE WITH V-CYLINDERS |
DE2703519A1 (en) * | 1977-01-28 | 1978-08-03 | Bayerische Motoren Werke Ag | Cylinder head for IC engine - has lubricant chamber in camshaft bearing and connected to cam lubrication channels |
-
1980
- 1980-03-08 DE DE19803009062 patent/DE3009062C2/en not_active Expired
- 1980-10-28 CA CA000363441A patent/CA1156527A/en not_active Expired
- 1980-12-02 JP JP17019880A patent/JPS56126608A/en active Granted
-
1981
- 1981-03-09 GB GB8107318A patent/GB2072746B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS56126608A (en) | 1981-10-03 |
DE3009062C2 (en) | 1982-09-16 |
DE3009062A1 (en) | 1981-10-08 |
GB2072746B (en) | 1983-08-10 |
JPH0122441B2 (en) | 1989-04-26 |
CA1156527A (en) | 1983-11-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4329949A (en) | Cylinder head for an internal-combustion engine | |
KR0137140B1 (en) | Overhead-valve type internal combustion engine | |
GB2058212A (en) | Lubricant passages in internal combustion engines | |
US5957118A (en) | Oil separating apparatus for engine | |
US6923154B2 (en) | Internal combustion engine comprising a cylinder crankcase | |
US4881510A (en) | Breather device of an engine | |
US3289657A (en) | Valve actuating mechanism | |
DE19944293A1 (en) | Engine lubrication system | |
GB2072746A (en) | Lubricating i.c. engine overhead camshafts | |
KR860004226A (en) | Engine Lubricator | |
US4991549A (en) | Camshaft lubricating system for engine | |
US5503116A (en) | Arrangement for supplying liquids to a piston | |
EP0377829B2 (en) | Camshaft lubrication system for an internal-combustion engine | |
JP4038111B2 (en) | Lubricator for valve mechanism | |
JPH1082312A (en) | Cylinder head unit of internal combustion engine | |
JPH0218255Y2 (en) | ||
CN100472053C (en) | Internal combustion engine cylinder head | |
JPS6024920Y2 (en) | Push rod chamber of overhead valve type engine | |
JPH0250287B2 (en) | ||
JPS595126Y2 (en) | Internal combustion engine valve rocker cover device | |
JPS6117205Y2 (en) | ||
JPS6339368Y2 (en) | ||
JP2530848Y2 (en) | Lubrication structure for vertical engine | |
JPS62225711A (en) | Lubricating device for engine | |
JPS6139051Y2 (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990309 |