US3412720A - Overhead camshaft assembly for internal combustion engines - Google Patents

Overhead camshaft assembly for internal combustion engines Download PDF

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Publication number
US3412720A
US3412720A US649346A US64934667A US3412720A US 3412720 A US3412720 A US 3412720A US 649346 A US649346 A US 649346A US 64934667 A US64934667 A US 64934667A US 3412720 A US3412720 A US 3412720A
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United States
Prior art keywords
camshaft
internal combustion
pipe
cylinders
combustion engines
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
Application number
US649346A
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English (en)
Inventor
Binder Robert
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Application granted granted Critical
Publication of US3412720A publication Critical patent/US3412720A/en
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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
    • F01L1/02—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
    • 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
    • F01L2001/188—Fulcrums at upper surface
    • 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]

Definitions

  • the present disclosure relates to an internal combustion engine, particularly air-cooled, having cylinders arranged in one or more rows, wherein the cylinder heads of one row of cylinders are separate and interconnected by means of a tubular support member or pipe that is preferably made of a single piece extending over the entire length of the cylinder row to serve as a housing and support for the camshaft. Aligned bores are provided in the corresponding cylinder heads for receiving therein the pipe. The internal surface of the pipe is disposed eccentrically with respect to the outer surface to provide room for a lubricating duct in the wall having the largest thickness.
  • Such a construction has the distinct disadvantage that it requires large tools and machines, and defects that originate during casting or subsequent machining result in large work pieces becoming unuseable. Additionally, the construction of the bridges between the valves, especially for V-arranged valves, cannot be shaped as desired, which is extremely disadvantageous in regard to high-output internal combustion engines.
  • the invention relates to an internal combustion engine having cylinders arranged in one or a number of rows, with individual cylinder heads associated with each cylinder.
  • the cylinder heads of a row of cylinders are interconnected with each other by means of a pipe or tubular support, which preferably consists of one piece and extends over the entire length of the cylinder row to serve as housing and support for the camshaft.
  • the support for the samshaft is easy to produce and to assemble. Furthermore, it is quite easy to line up the cylinders in a space saving manner, without the necessity of the camshaft support functioning as a cover or cover housing.
  • the pipe or tubular support may be readily and cheaply produced, because of its simply constructed surfaces in contrast to prior art arrangements that have com- Patented Nov. 26, 1968 ice plicated configurations requiring expensive casting and machining.
  • the support of the present invention is considerably lighter in construction when compared with the prior art devices.
  • connection of the pipe with each of the cylinder heads is accomplished by means of aligned bores in the cylinder heads to receive therein the pipe in a bearing manner while avoiding a plurality of complicated fastening means.
  • the inner surface of the pipe is eccentric with respect to the outer surface thereof so that the largest thickness walls are relatively reinforced and provided with fastening means for axially and rotationally securing the pipe, for example.
  • a lubricating duct may be provided in the walls of the pipe, preferably the wall having the largest wall thickness.
  • FIGURE 1 is a partial longitudinal cross sectional view taken through an internal combustion engine employing the inventive features of the present invention.
  • FIGURE 2 is a cross sectional view taken along line IIII of FIGURE 1, on a reduced scale.
  • the air-cooled internal combustion engine includes a plurality of individual and separate cylinder heads 1, 2, 3, which are arranged in a single row of cylinders; other individual cylinders in the row and additional rows of cylinders are not shown in the drawing.
  • the cylinder heads 1, 2, 3 are interconnected by means of a pipe or tubular support member 4 that 7 extends as a unitary, preferably single piece, over the entire length of the cylinder row.
  • the back portions of the individual cylinder heads are provided with bores 5, 6, 7, respectively.
  • Each cylinder head is provided with valves 8, 9, which are actuated by means of rocker levers 10', 11 that are pivoted by suitable cams arranged on the camshaft 12.
  • the rocker levers 10, 11 are supported by bolts 13, 14 having an outer spherical or ball shape for engaging the levers.
  • the bolts 13, 14 are supported in the covers 15, 16, respectively, which provide access to the control members in the cylinder head.
  • the camshaft 12 is supported in the pipe 4 by the internal cylindrical surface 17 of the pipe that directly engages the plurality of cylindrical bearing surfaces of the camshaft, which are of equal diameter.
  • the internal surface 17 is eccentric with respect to the outer cylindrical surface 18 of the pipe 4.
  • a lubricating duct 20 is cut or otherwise formed to be connected to the lubricating oil system, not shown, for supplying lubricating oil through substantially radially extending lubricating passageways 21 to the cams on the camshaft and the supporting bearings.
  • the lubricating duct 20 may also supply hydraulic fluid for operating the adjusting mechanisms 25 that adjust the valve clearance.
  • Such an adjusting mechanism is shown in FIGURE 2 for axially moving the bolt 13 to change the position of the fulcrum point for the rocking lever 10, is shown as mounted in the cover 15.
  • the pipe 4 is provided with cutouts 22 for providing fluid communication between the lubricating duct 20 and a bore 23 in the cylinder head 1.
  • the bore 23 is in fluid communication with a passage 24 in the cover 15 to supply hydraulic fluid to the adjusting mechanism 25, which is of known construction per se.
  • the pipe 4 is provided with cut out portions or substantially radially extending openings 26, 27, which allow engagement between the rocker levers 10, 11 and the cams on the camshaft 12. These cutouts are also constructed to provide lateral support and guiding for the rocking levers.
  • threaded plugs 28 Adjacent to the bolts 13, 14 there are provided threaded plugs 28, one being shown with respect to the bolt 14.
  • the threaded plugs 28 close a correspondingly sized opening in the cover 16 through which adjustment of the valve clearance may be performed.
  • the pipe 4 has an outer cylindrical surface that conforms to the cylindrical surfaces of the bores 5, 6, 7.
  • the pipe 4 is held in the cylinder head 1 by one or more screws 29 to prevent rotation.
  • the camshaft 12 is axially secured by means of an integral shoulder or abutment flange 30 at one axial end.
  • the abutment flange 30 may be integrally formed with a driving gear or chain sprocket 31 for driving the camshaft by means of a chain (not shown) connected to the crankshaft of the internal combustion engine.
  • the camshaft is axially urged into abuting engagement by means of a spring 32 that engages the end of the camshaft by means of a ball 33, both of which are held and guided within a housing 34 for the control gearing drive.
  • An internal combustion engine comprising: at least a plurality of engine cylinders arranged in a single longitudinal row; a separate cylinder head for each of said cylinders attached thereto; a tubular support member of unitary construction mounted on said cylinder heads; a camshaft rotatably mounted in said tubular member; means for rotatably driving said camshaft.
  • tubular support member has an exterior cylindrical surface and an interior cylindrical surface eccentric with respect to said exterior cylindrical surface to provide wall portions of different thickness.
  • tubular support member has a cylindrical bearing surface extending longitudinally for the full length thereof; said camshaft having a plurality of cylindrical bearing portions the same diameter as said tubular support member cylindrical bearing surface and engaging therewith to form bearing means; said lubricating duct having lubricating passageway means for conducting lubricating oil from said lubricating duct to said bearing means.
  • the engine according to claim 6, including the interior surface of said cylinder head bores and the exterior surface of said tubular support member being cylindrical and of the same diameter; at least one valve associated with each of said cylinder heads and having actuating means driven by said camshaft; said tubular support member having a plurality of radially extending openings corresponding in number to and aligned with said valve actuating means; said camshaft having an integral abutment flange at one end axially abuting with said tubular member; said camshaft having a driving gear integrally secured to said abutment flange; screw means mounted on said cylinder heads and extending radially into corresponding bores in said tubular support member for securing said tubular support member against rotational movement.
  • tubular support member has an exterior cylindrical surface and an interior cylindrical surface eccentric with respect to said exterior cylindrical surface to provide wall portions of different thickness.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
US649346A 1966-07-07 1967-06-27 Overhead camshaft assembly for internal combustion engines Expired - Lifetime US3412720A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP39889A DE1294737B (de) 1966-07-07 1966-07-07 Luftgekuehlte Brennkraftmaschine

Publications (1)

Publication Number Publication Date
US3412720A true US3412720A (en) 1968-11-26

Family

ID=7376785

Family Applications (1)

Application Number Title Priority Date Filing Date
US649346A Expired - Lifetime US3412720A (en) 1966-07-07 1967-06-27 Overhead camshaft assembly for internal combustion engines

Country Status (3)

Country Link
US (1) US3412720A (de)
DE (1) DE1294737B (de)
GB (1) GB1118910A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359018A (en) * 1979-03-29 1982-11-16 General Motors Corporation Engine camshaft and piston lubrication
US4430971A (en) * 1981-12-28 1984-02-14 Norman Holding Internal combustion engine
US4561391A (en) * 1985-04-04 1985-12-31 Ford Motor Company Four valve for cylinder engine with single overhead camshaft
US4672926A (en) * 1983-01-20 1987-06-16 Saab-Scania Aktiebolag Arrangement for hydraulic pressure feed in internal combustion engines
US4754729A (en) * 1985-10-11 1988-07-05 Honda Giken Kogyo Kabushiki Kaisha Camshaft support assembly for valve operating mechanism in an internal combustion engines
US5090375A (en) * 1990-11-26 1992-02-25 Tecumseh Products Company Valve gear oiling system for overhead camshaft engine
US5687680A (en) * 1994-07-13 1997-11-18 Honda Giken Kogyo Kabushiki Kaisha Valve system for overhead valve internal combustion engine
US20040055551A1 (en) * 1999-06-10 2004-03-25 Unisia Jecs Corporation Oil pressure control apparatus for an internal combustion engine
EP1460238A2 (de) * 2003-03-18 2004-09-22 HONDA MOTOR CO., Ltd. Brennkraftmaschine mit obenliegender Nockenwelle
US20080149064A1 (en) * 2006-12-21 2008-06-26 Manabu Shibata Supporting structure and a supporting member for a camshaft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609206A1 (de) * 1985-03-27 1986-10-09 Volkswagen AG, 3180 Wolfsburg Zylinderkopfdeckel fuer eine brennkraftmaschine mit obenliegender nockenwelle
DE102012103594B4 (de) 2012-04-24 2015-08-27 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit durch Spritzöl beölbare, verstellbare Nocken

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US870065A (en) * 1905-05-29 1907-11-05 Allie R Welch Gas-engine.
US1195441A (en) * 1916-08-22 Xotbbwal-combtjstion ewghste
US1235110A (en) * 1916-09-06 1917-07-31 Sunbeam Motor Car Co Ltd Cam-shaft casing for internal-combustion engines.
US1406271A (en) * 1921-01-17 1922-02-14 Henry C Michelsen Internal-combustion engine
US1514066A (en) * 1921-06-02 1924-11-04 Victor W Page Internal-combustion motor
US1701550A (en) * 1929-02-12 Lionel m
GB305017A (en) * 1928-01-28 1929-07-25 Marius Jean Baptiste Barbarou Improved arrangement for the lubrication of the valve gear of internal combustion engines of the radial type
GB403300A (en) * 1933-06-02 1933-12-21 Balfour Read Cylinder-heads and valve gear of multi-cylinder internal-combustion engines
US2213202A (en) * 1937-07-11 1940-09-03 Buchi Alfred Internal combustion engine
US2793625A (en) * 1954-10-01 1957-05-28 Gen Motors Corp Engine frame
US2865341A (en) * 1955-01-19 1958-12-23 Gen Motors Corp Engine frame construction
US3022775A (en) * 1960-09-26 1962-02-27 John Dolza Cylinder heads for internal combustion engines
US3352293A (en) * 1965-07-28 1967-11-14 Gen Motors Corp Camshaft construction

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1260847A (en) * 1918-03-26 Winton Gas Engine & Mfg Company Explosive-engine.

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1195441A (en) * 1916-08-22 Xotbbwal-combtjstion ewghste
US1701550A (en) * 1929-02-12 Lionel m
US870065A (en) * 1905-05-29 1907-11-05 Allie R Welch Gas-engine.
US1235110A (en) * 1916-09-06 1917-07-31 Sunbeam Motor Car Co Ltd Cam-shaft casing for internal-combustion engines.
US1406271A (en) * 1921-01-17 1922-02-14 Henry C Michelsen Internal-combustion engine
US1514066A (en) * 1921-06-02 1924-11-04 Victor W Page Internal-combustion motor
GB305017A (en) * 1928-01-28 1929-07-25 Marius Jean Baptiste Barbarou Improved arrangement for the lubrication of the valve gear of internal combustion engines of the radial type
GB403300A (en) * 1933-06-02 1933-12-21 Balfour Read Cylinder-heads and valve gear of multi-cylinder internal-combustion engines
US2213202A (en) * 1937-07-11 1940-09-03 Buchi Alfred Internal combustion engine
US2793625A (en) * 1954-10-01 1957-05-28 Gen Motors Corp Engine frame
US2865341A (en) * 1955-01-19 1958-12-23 Gen Motors Corp Engine frame construction
US3022775A (en) * 1960-09-26 1962-02-27 John Dolza Cylinder heads for internal combustion engines
US3352293A (en) * 1965-07-28 1967-11-14 Gen Motors Corp Camshaft construction

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4359018A (en) * 1979-03-29 1982-11-16 General Motors Corporation Engine camshaft and piston lubrication
US4430971A (en) * 1981-12-28 1984-02-14 Norman Holding Internal combustion engine
US4672926A (en) * 1983-01-20 1987-06-16 Saab-Scania Aktiebolag Arrangement for hydraulic pressure feed in internal combustion engines
US4561391A (en) * 1985-04-04 1985-12-31 Ford Motor Company Four valve for cylinder engine with single overhead camshaft
US4754729A (en) * 1985-10-11 1988-07-05 Honda Giken Kogyo Kabushiki Kaisha Camshaft support assembly for valve operating mechanism in an internal combustion engines
US5090375A (en) * 1990-11-26 1992-02-25 Tecumseh Products Company Valve gear oiling system for overhead camshaft engine
US5687680A (en) * 1994-07-13 1997-11-18 Honda Giken Kogyo Kabushiki Kaisha Valve system for overhead valve internal combustion engine
US20040055551A1 (en) * 1999-06-10 2004-03-25 Unisia Jecs Corporation Oil pressure control apparatus for an internal combustion engine
US6848404B2 (en) * 1999-06-10 2005-02-01 Unisia Jecs Corporation Oil pressure control apparatus for an internal combustion engine
US20050103191A1 (en) * 1999-06-10 2005-05-19 Unisia Jecs Corporation Oil pressure control apparatus for an internal combustion engine
US7281506B2 (en) 1999-06-10 2007-10-16 Hitachi, Ltd. Oil pressure control apparatus for an internal combustion engine
EP1460238A2 (de) * 2003-03-18 2004-09-22 HONDA MOTOR CO., Ltd. Brennkraftmaschine mit obenliegender Nockenwelle
EP1460238A3 (de) * 2003-03-18 2005-08-24 HONDA MOTOR CO., Ltd. Brennkraftmaschine mit obenliegender Nockenwelle
US20080149064A1 (en) * 2006-12-21 2008-06-26 Manabu Shibata Supporting structure and a supporting member for a camshaft
US7647912B2 (en) * 2006-12-21 2010-01-19 Otics Corporation Supporting structure and a supporting member for a camshaft

Also Published As

Publication number Publication date
DE1294737B (de) 1969-05-08
GB1118910A (en) 1968-07-03

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