Classifications

• • 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
  • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the 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
  • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
  • F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
• • 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
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads
  • F02F1/26—Cylinder heads having cooling means
  • F02F1/36—Cylinder heads having cooling means for liquid cooling
  • F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
• • 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
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads
  • F02F2001/244—Arrangement of valve stems in cylinder heads
  • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• This invention relates to internal combustion engines, and cylinder heads therefor.
• Conventional internal combustion engines comprise a cylinder head having a recess therein, a cylinder block having a piston reciprocable in an open-ended cylinder therein, the cylinder being positioned to register with the recess in the head to define a combustion chamber, and inlet and outlet valves mounted in valve openings in the recess for axial movement relative to the cylinder head to open and close the valve openings.
• It is known to shape the recess e.g. by forming a cusp in one side wail, which projects between the inlet and outlet, valves along the range of movement of the inlet valve so as to impart a swirling motion to gases flowing into the combustion chamber through the inlet valve.
• the swirling motion assists in mixing fuel and air within the combustion chamber and improves combustion.
• a cylinder head for an internal combustion engine comprising a recess for cooperating with a piston and cylinder in a cylinder block to define a combustion chamber and inlet and outlet apertures for seating inlet and outlet valves, the walls of the recess around the inlet aperture being shaped to impart a swirling action to gases flowing therethrough into the chamber, characterised in that the walls of the recess around the inlet aperture are shaped to impart the swirling action only when the inlet valve is partially open.
• the swirling action imparted to the gase s whilst the inlet valve is partially open is sufficient to improve the combustion in the engine.
• the swirling action is produced by a cusp on one side of the recess which projects radially across the recess between the inlet and outlet apertures, but extends axiaily from the inlet aperture a distance less than the axial movement of the inlet valve between its open and closed positions.
• the distance by which the cusp extends beyond the inlet aperture is no more than half, but preferably at least one quarter of the axial movement of the inlet valve between its open and closed positions.
• the invention also includes an internal combustion engine incorporating a cylinder head in accordance with the invention.
• Figure 1 is a vertical cross- section through part of an internal combustion engine in accordance with the invention
• Figure 2 is a bottom view of a cylinder head incorporated in the engine of Figure 1.
• an internal combustion engine 1 comprises a cylinder head 2 having a number of cardiodal recesses, one of which is shown at 3,in its lower surface, secured to a cylinder block 4 having a similar number of pistons 5 and cylinders
• combustion chamber 7 As best seen in Figure 2, fuel and air mixture may be introduced into the combustion chamber
• the fuel and air mixture can be ignited in the combustion chamber by a sparking plug (not shown) retained in a threaded bore 11 in the roof of the recess 3.
• the products of combustion may be exhaus ted f rom the combustion chamber 7 through an exhaust aperture 12 , which is opened and closed by movement of an exhaus t valve 13 in a conventional manner.
• One side wall, of the recess 4 includes a cusp 14 which proj ects between the inlet a nn outlet aperture s 8, 12. As best seen in Figure 1 , the cusp extends axially downwardly from the inlet aperture in the roof of the recess 3 by a distance equal to about one third of the movement of the inlet valve 9 between its open and closed positions.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combustion Methods Of Internal-Combustion Engines (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10520040

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (3)

Citations (4)

Family Cites Families (7)

• 1981
  • 1981-02-27 GB GB8106324A patent/GB2093911A/en not_active Withdrawn
• 1982
  • 1982-02-26 WO PCT/GB1982/000065 patent/WO1982002924A1/en not_active Ceased
  • 1982-02-26 US US06/442,195 patent/US4513709A/en not_active Expired - Fee Related
  • 1982-02-26 JP JP57500660A patent/JPS58500294A/ja active Granted
  • 1982-02-26 EP EP82900559A patent/EP0073207B1/en not_active Expired
  • 1982-02-26 DE DE8282900559T patent/DE3261500D1/de not_active Expired

Patent Citations (4)

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