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
  • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
  • F02M35/1205—Flow throttling or guiding
  • F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
• • 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
  • F02M35/10118—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
• • 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
  • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
  • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
• • 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
  • F02M35/14—Combined air cleaners and silencers

Definitions

• Such an air intake system is known from DE-OS 38 42 248. This is a compact combination of engine air cleaner and silencer for installation in the engine compartment of a motor vehicle.
• the air intake system consists of a plastic housing, which has a raw air inlet and an air outlet to the engine.
• the inlet is equipped with a noise-reducing venturi tube.
• An air filter and a further venturi tube are connected downstream of the venturi tube.
• a resonance chamber with dead air space is arranged between the two Venturi tubes, which is intended to capture or dissolve motor feedback noises and sound waves.
• a disadvantage of the system is that this so-called dead air space requires a considerable amount of space.
• the muzzle noise on the first Venturi tube is only slightly reduced.
• the invention is therefore based on the object of creating an air intake system for internal combustion engines which lowers the muzzle noise at the air inlet with simple means.
• the main advantage of the invention is to be seen in the fact that a shell-shaped element or a shell-shaped wall is provided directly behind the air inlet via the diffuser, which has the aim of deflecting the supplied air.
• the diffuser end is immersed in this bowl-shaped element.
• the deflection lengthens the diffuser.
• the consequence of this deflection is that the muzzle noise is considerably reduced.
• the bowl-shaped design also achieves a low flow resistance.
• the shell-shaped element is designed as a pot element. This pot element can be attached to the diffuser or integrated into the housing.
• the shell-shaped element is part of the housing, i. H. a wall of the housing is designed in accordance with a shell into which the diffuser end is immersed.
• An advantageous development of the invention consists in that the air filter is integrated in the housing forming the damping volume, so that the housing is separated into an unfiltered air space and a clean air space.
• the diffuser is expediently arranged in the raw air space.
• FIG. 1 shows the sectional view of an air intake system
• Figure 2 is a plan view of the part of a filter housing on the raw air side.
• the part of the air intake system shown in FIG. 1 consists of a housing 10 with an upper housing part 11, a lower housing part 12.
• a diffuser 13 is provided for supplying the raw air.
• An air filter element 14 is located between the upper and lower housing parts. The air filter element is clamped in the connection area of the two housing parts and fastened there.
• An air outlet 15 is provided in the upper housing part 11 for the cleaned air to be supplied to the internal combustion engine.
• the diffuser 13 is provided with a pot-shaped element 16 at its housing end. This cup-shaped element is attached or attached to the diffuser via webs 17, 18.
• FIG. 2 shows a plan view of the housing part 12 on the unfiltered air side.
• the unfiltered air supplied via the diffuser 13 is deflected by the cup element according to the arrow 19, the annular gap between the outer diameter of the diffuser and the diameter of the Cup elements are dimensioned so that the cross-sectional area of the annular gap corresponds to the cross-sectional area of the diffuser. This does not generate an increase in resistance.
• the improvement of the acoustics by the pot element would also be achieved by a longer unfiltered air hose or diffuser. However, as can be seen from FIG. 2, such an extension is not possible due to the available space.
• the pot element therefore has the advantage that it does not take up any additional installation space and can be attached to the diffuser as a single element or can be connected to the lower housing part.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Characterised By The Charging Evacuation (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8023796

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (4)

• 1996
  • 1996-05-10 DE DE29608472U patent/DE29608472U1/de not_active Expired - Lifetime
• 1997
  • 1997-02-18 WO PCT/EP1997/000751 patent/WO1997043540A1/de active Application Filing
  • 1997-02-26 IN IN119BO1997 patent/IN186650B/en unknown
  • 1997-04-07 ZA ZA9702943A patent/ZA972943B/xx unknown

Patent Citations (4)

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events