Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/10—Air intakes; Induction systems
  • F02M35/104—Intake manifolds
  • F02M35/112—Intake manifolds for engines with cylinders all in one line
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/10—Air intakes; Induction systems
  • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
  • F02M35/10124—Ducts with special cross-sections, e.g. non-circular cross-section
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
  • F02M35/10—Air intakes; Induction systems
  • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
  • F02M35/10281—Means to remove, re-atomise or redistribute condensed fuel; Means to avoid fuel particles from separating from the mixture
• • 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

• an intake manifold is used to convey a fuel/air mixture from a carburettor to the engine cylinders.
• the carburettor produces a mixture of fuel and air, and this mixture is drawn along intake manifold passages by the suction produced by piston displacement.
• an engine intake manifold In which the internal wails of the passages which, in use, lead from a carburettor to the engine cylinders are provided with ribs arranged so that the fuel/air mixture flowing along the passages has to flow across the ribs.
• the fuel/air mixture in fact flows along the manifold passages in a helical path, although the pitch of the helix changes as the throttle opening changes, and is smallest when the throttle opening is small.
• the ribs can thus be arranged so that they extend substantially parallel to the passage axis or, preferably, in a helix of opposite hand to that followed by the fuel/air mixture.
• the liquid fuel in the manifold passages is driven along a helical path by the flowing fuel vapour. As the liquid reaches a rib, it is driven up the leading slope of the rib and is then projected from the top of the rib, so that it escapes from contact with the manifold wall in the form of droplets and the chances of vapourising this fuel are thereby enhanced.
• the ribs preferably have a sharp tip, and may for example be of triangular cross-section.
• annular ribs may be used which extend around the internal circumference of the passage.
• the ribs are preferably formed integrally with the manifold wall, by casting with the manifold wall.
• Figure 1 is a perspective view of part of an intake manifold according to the invention.
• Figure 2 is a detail view of a portion of a manifold passage wall.
• the manifold shown in Figure 1 has a riser block 10 to which the outlet end of a carburettor can be bolted. In the embodiment shown, this will be a twin venturi carburettor. Manifold passages 12 lead from the riser 10 to an end plate 14 which will be bolted against the cylinder block of an engine. This is conventional technology.
• Each manifold passage 12 has an internal wall 16. As can be seen from the sectioned part of the left-hand passage in Figure 1, a number of ribs 18, in this case four, are provided around the passage periphery. These ribs are triangular in section, and are formed integrally with the manifold wall. The ribs extend from one end of the passages to the other.
• Figure 2 illustrates what happens to liquid fuel crossing the ribs 18. Because the fuel is driven in a helical path around the passage by the helically-moving vapour, it follows a path indicated by arrow heads on the flow lines 30. The fuel is blown up the leading edge of the rib, and is then blown off from the top of the rib in the form of droplets 22 which are thereby introduced directly into the vapour flow and thus have a good chance of being maintained in the vapour state and of reaching the engine cylinders in this state.
• the ribs shown in the Figures extend parallel to the passage axes. It is also possible to arrange the ribs along helical paths, on helixes of opposite hand to those which will be followed by the fuel and air.
• the fuel and air flow pattern does change as the throttle opening changes, and on a single venturi carburettor, has a maximum swirl (smallest helix pitch) at about half open throttle.
• the situation is more complex with a twin venturi carbyrettor.
• annular ribs which act as weirs can be provided so that a fuel/air mixture flowing straight along the passage will also have to flow across a rib.
• the fuel should flow across the rib at right angles. For a particular rib, this will only be possible over a narrow range of conditions.
• the rib or ribs in each passage will be positioned so that, over the anticipated range of flow conditions in that passage, the fuel and air will flow across as many ribs as possible, at as large an angle as possible to the length of the rib.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
• Means For Warming Up And Starting Carburetors (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10549892

Family Applications (1)

Country Status (3)

Cited By (5)

Families Citing this family (2)

Citations (4)

Family Cites Families (7)

• 1983
  • 1983-10-08 GB GB08326973A patent/GB2147658B/en not_active Expired
• 1984
  • 1984-09-28 WO PCT/US1984/001576 patent/WO1985001778A1/en unknown
  • 1984-09-28 DE DE19843435786 patent/DE3435786A1/de active Granted

Patent Citations (4)

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