EP0055901B1 - Valve gear lubrication for an internal combustion engine - Google Patents
Valve gear lubrication for an internal combustion engine Download PDFInfo
- Publication number
- EP0055901B1 EP0055901B1 EP81305842A EP81305842A EP0055901B1 EP 0055901 B1 EP0055901 B1 EP 0055901B1 EP 81305842 A EP81305842 A EP 81305842A EP 81305842 A EP81305842 A EP 81305842A EP 0055901 B1 EP0055901 B1 EP 0055901B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- oil
- case
- filter means
- additional filter
- 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
Links
Images
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
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/02—Arrangements of lubricant conduits
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- 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
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/03—Mounting or connecting of lubricant purifying means relative to the machine or engine; Details of lubricant purifying means
-
- 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
- F01M9/105—Lubrication of valve gear or auxiliaries using distribution conduits
Definitions
- This invention relates to an internal combustion engine having an overhead camshaft to parts of which lubrication is applied by spraying.
- Lubrication of the interface between each cam of an overhead camshaft and the component against which the cam operates e.g. valve stem, tappet, rocker, ultimately controlling the aspiration valves of an internal combustion engine, is often effected by spraying.
- the primary objective of such lubrication is to direct a spray of oil on to an intended area of the cam and/or the component against which the cam directly operates. Effective lubrication of the said interface is mainly dependent on maintaining a sufficient oil spray onto the intended area.
- the spray is usually emitted from a small hole or jet in a conduit situated conveniently near the said area and fed from the engine oil pump by pipes and/or oilways in the cylinder block and head.
- An average engine oil filter is effective in preventing the flow, in the general oil circuits, of particles which would be injurious to sleeve and rolling bearings. However, it does allow to pass minute particles which in time, become coagulated on the walls of pipes or oilways to form areas of "crust".
- the said pieces may become dislodged purely by the flow of oil in the pipes or oilways, but their incidence is enhanced by the addition of or change to a higher detergent oil than normally used. This is particularly noticeable after the engine has been "flushed out”.
- An object of the present invention is to provide an O.H.C. internal combustion engine wherein this problem is obviated or minimised.
- the invention provides an internal combustion engine having an overhead camshaft and a lubrication system including an oil reservoir, a pump and a filter for supplying filtered lubricating oil to desired parts of the engine, the lubrication system including a plurality of apertures whence oil is pumped to lubricate cam surface of the camshaft, characterised in that additional filter means is provided in the oil flow to the apertures to discourage or prevent solid particles or matter from reaching the apertures and causing total or partial blockage thereof.
- the additional filter means should be positioned as far downstream in the oil stream flow as conditions allow; preferably in the final stage, just before the spray holes, in order to minimise the likelihood of blockage.
- the chosen example of engine of the invention is the British Ford Petrol engine 1600 OHC or 2000 OCH currently in production.
- camshaft lubrication oil ascends from the engine oil pump and filter, both situated low near the sump, through an oilway in the cylinder block, through a perforation in the cylinder head gasket, through an oilway in the cylinder head into the camshaft centre bearing pedestal from which it passes through a horizontally drilled oilway into the spray pipe assembly (Fig. 2).
- Fig. 2 is a pictorial view of an assembly consisting of a spray pipe 10, nipple 11 and bracket 12.
- the assembly is that Ford Part which in U.K. is given No. 1490126 and which in Europe and U.S.A. is marked 70 HM 6578AE and DIFZ-6578A respectively.
- the assembly is secured by a bolt 13 to the side of the camshaft centre bearing pedestal 14 (Fig. 2a) while the nipple 11 enters a horizontally drilled oilway 15, to receive and transmit oil to the pipe 10. From this point oil flows into the fore and aft halves of the pipe 10a 10b finally to emerge as a spray 16 from each of eight spray holes 17, one spray lubricating each of each cams (not illustrated).
- the ends 18 of the pipe are sealed, and secured by one bolt each (not shown) to the camshaft force and aft bearing pedestals (also not shown).
- Another hazardous feature of this particular engine lies in the fact that the oil passes from an oilway in the cylinder block to an oilway in the cylinder head via the cylinder head gasket. Therefore, very special care must be taken, when changing the cylinder head gasket for maintenance purposes, that foreign matter, such as scrapings does not enter the oilway in either the cylinder block or the cylinder head, for on restarting the engine, such matter could be carried along by the oil and block one or more of the spray holes.
- Filter components are assembled in the case (1) in the following order:
- This assembly is then secured to the camshaft centre bearing pedestal by a bolt 30 which may be tightened solidly and yet apply a dimensionally controlled compression to the two '0' ring seals 22, 27 because of the limit to its movement imposed by the solid centre parts of the various components forming a stack around it.
- a nipple 31 on the case 21 enters the horizontally drilled hole 15 (Fig. 4) in the camshaft centre bearing pedestal 33 to admit oil to the filter case 21.
- the ends of the pipes 20a, 20b are secured as before to the camshaft fore and aft bearing pedestals (not shown).
Abstract
Description
- This invention relates to an internal combustion engine having an overhead camshaft to parts of which lubrication is applied by spraying.
- Lubrication of the interface between each cam of an overhead camshaft and the component against which the cam operates e.g. valve stem, tappet, rocker, ultimately controlling the aspiration valves of an internal combustion engine, is often effected by spraying.
- The primary objective of such lubrication is to direct a spray of oil on to an intended area of the cam and/or the component against which the cam directly operates. Effective lubrication of the said interface is mainly dependent on maintaining a sufficient oil spray onto the intended area.
- The spray is usually emitted from a small hole or jet in a conduit situated conveniently near the said area and fed from the engine oil pump by pipes and/or oilways in the cylinder block and head.
- An average engine oil filter is effective in preventing the flow, in the general oil circuits, of particles which would be injurious to sleeve and rolling bearings. However, it does allow to pass minute particles which in time, become coagulated on the walls of pipes or oilways to form areas of "crust".
- Any pieces of this "crust" subsequently dislodged are able to circulate the oilways or pipes and may reach lubrication areas without being influenced by the filter.
- While such pieces are usually too soft by their nature to injure sleeve or rolling bearings, they have enough size and tenacity to block the spray holes of the spray lubrication system, thereby starving the cams of their lubrication.
- The said pieces may become dislodged purely by the flow of oil in the pipes or oilways, but their incidence is enhanced by the addition of or change to a higher detergent oil than normally used. This is particularly noticeable after the engine has been "flushed out".
- An object of the present invention is to provide an O.H.C. internal combustion engine wherein this problem is obviated or minimised.
- Accordingly the invention provides an internal combustion engine having an overhead camshaft and a lubrication system including an oil reservoir, a pump and a filter for supplying filtered lubricating oil to desired parts of the engine, the lubrication system including a plurality of apertures whence oil is pumped to lubricate cam surface of the camshaft, characterised in that additional filter means is provided in the oil flow to the apertures to discourage or prevent solid particles or matter from reaching the apertures and causing total or partial blockage thereof.
- Because the chance of such a blockage increases with the length of conduit such as piping and/or oilways leading to the spray holes the additional filter means should be positioned as far downstream in the oil stream flow as conditions allow; preferably in the final stage, just before the spray holes, in order to minimise the likelihood of blockage.
- The invention will be described further, by way of example, with reference to the accompanying drawings wherein:
- Fig. 1 is a perspective view of an engine modified in accordance with the present invention;
- Fig. 2 and 2a are fragmentary views, respectively a perspective view of a spray conduit and a part-sectional view showing the conduit connected to a cylinder head in a conventional internal combustion engine;
- Fig. 3 is a view similar to that of Fig. 2 but showing the conduit modified and connected to a filter illustrated in exploded form, and
- Fig. 4 is a view similar to that of Fig. 2(a) but showing the filter in position connecting the conduit to a camshaft bearing pedestal of an engine.
- The chosen example of engine of the invention is the British Ford Petrol engine 1600 OHC or 2000 OCH currently in production.
- In this style of engine, camshaft lubrication oil ascends from the engine oil pump and filter, both situated low near the sump, through an oilway in the cylinder block, through a perforation in the cylinder head gasket, through an oilway in the cylinder head into the camshaft centre bearing pedestal from which it passes through a horizontally drilled oilway into the spray pipe assembly (Fig. 2).
- Fig. 2 is a pictorial view of an assembly consisting of a spray pipe 10, nipple 11 and
bracket 12. The assembly is that Ford Part which in U.K. is given No. 1490126 and which in Europe and U.S.A. is marked 70 HM 6578AE and DIFZ-6578A respectively. The assembly is secured by abolt 13 to the side of the camshaft centre bearing pedestal 14 (Fig. 2a) while the nipple 11 enters a horizontally drilledoilway 15, to receive and transmit oil to the pipe 10. From this point oil flows into the fore and aft halves of thepipe 10a 10b finally to emerge as aspray 16 from each of eightspray holes 17, one spray lubricating each of each cams (not illustrated). - The
ends 18 of the pipe are sealed, and secured by one bolt each (not shown) to the camshaft force and aft bearing pedestals (also not shown). - It is this existing system which is vulnerable to blocking of the
spray holes 17. - Another hazardous feature of this particular engine lies in the fact that the oil passes from an oilway in the cylinder block to an oilway in the cylinder head via the cylinder head gasket. Therefore, very special care must be taken, when changing the cylinder head gasket for maintenance purposes, that foreign matter, such as scrapings does not enter the oilway in either the cylinder block or the cylinder head, for on restarting the engine, such matter could be carried along by the oil and block one or more of the spray holes.
- Referring simultaneously to Figs. 3 and 4, in an engine in accordance with the invention the innermost ends of
pipe halves filter case 21 in such a manner that the said ends do not protrude into the inside of thecase 21 but the bores of thepipes case 21. When thecase 21 is being made, holes for the ends ofpipes tubular spigot 32 which facilitates brazing of the pipe ends to thecase 21 and increases the tolerance in the length to which thepipe halves -
- This assembly is then secured to the camshaft centre bearing pedestal by a
bolt 30 which may be tightened solidly and yet apply a dimensionally controlled compression to the two '0' ring seals - At the same time a
nipple 31 on thecase 21 enters the horizontally drilled hole 15 (Fig. 4) in the camshaftcentre bearing pedestal 33 to admit oil to thefilter case 21. The ends of thepipes - Now referring to Fig. 4. On starting the engine, oil passes from the drilled
hole 15 in the camshaftcentre bearing pedestal 33 through thenipple 31 intochamber 34 from where any subsequent flow must be throughfilter screens 23 the whole area of which is available to pass oil but to stop particles greater than a given size and to collect such particles inchamber 34. - The now filtered oil flow through holes 35 in
plate 24 intoannulus 36 into the bores ofpipe 20 and is finally emitted from the spray holes onto the intended area of the cam.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81305842T ATE13579T1 (en) | 1980-12-29 | 1981-12-10 | VALVE DRIVE LUBRICATION FOR AN ENGINE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8041356 | 1980-12-29 | ||
GB8041356 | 1980-12-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0055901A1 EP0055901A1 (en) | 1982-07-14 |
EP0055901B1 true EP0055901B1 (en) | 1985-05-29 |
Family
ID=10518225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81305842A Expired EP0055901B1 (en) | 1980-12-29 | 1981-12-10 | Valve gear lubrication for an internal combustion engine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0055901B1 (en) |
AT (1) | ATE13579T1 (en) |
DE (1) | DE3170777D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5472045A (en) * | 1994-07-29 | 1995-12-05 | Modine Manufacturing Company | Donut oil cooler with a reusable filter |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1938506A (en) * | 1932-07-05 | 1933-12-05 | Wellman Davis Milton | Valve guide lubricator |
US2030646A (en) * | 1934-09-26 | 1936-02-11 | Longo Joseph | Lubricating device |
FR1027936A (en) * | 1949-11-21 | 1953-05-18 | Lubricating device for upper valves of internal combustion engines | |
GB820878A (en) * | 1956-11-05 | 1959-09-30 | Continental Motors Corp | Lubrication system for internal combustion engines |
DE2620480C2 (en) * | 1976-05-08 | 1984-03-01 | Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen | Lubricating oil supply |
DE2843248C2 (en) * | 1978-10-04 | 1984-08-23 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Lubricating oil circuit for an internal combustion engine |
-
1981
- 1981-12-10 AT AT81305842T patent/ATE13579T1/en active
- 1981-12-10 DE DE8181305842T patent/DE3170777D1/en not_active Expired
- 1981-12-10 EP EP81305842A patent/EP0055901B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ATE13579T1 (en) | 1985-06-15 |
EP0055901A1 (en) | 1982-07-14 |
DE3170777D1 (en) | 1985-07-04 |
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