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
  • F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
• • 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
  • F02M35/1238—Flow throttling or guiding by using secondary connections to the ambient, e.g. covered by a membrane or a porous member
• • 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
  • F02M35/1283—Manufacturing or assembly; Connectors; Fixations

Definitions

• the invention relates to an intake device, in particular for an internal combustion engine, with a line section which has openings, according to the preamble of patent claim 1.
• the intake manifold of an air filter housing is provided with a series of holes.
• the holes create short circuits between the pipe voium and the environment beyond the pipe wall. This suppresses or reduces the formation of standing waves in the tube, thereby damping the intake noise.
• the area around the pipe is usually formed by the engine compartment, in which further components of the internal combustion engine are arranged. Due to the short circuit of the engine compartment with the interior of the pipe, however, the pulsation of the intake air leads to vibration excitation of other components in the engine compartment, which may make additional measures for vibration damping necessary. In addition, warm air can be drawn in from the engine compartment via the bores, as a result of which the performance of the internal combustion engine is reduced. Incidentally, the drilling of holes in the pipe socket means an additional manufacturing effort that reduces the economics of the component. This can only be kept within limits by providing only a small number of holes. It might be used as a conduit section a fabric tube having a certain Heilehrs' stechnik the environment. Although these components have optimal acoustic properties, they are expensive to manufacture.
• connection to the suction device creates additional manufacturing and assembly costs.
• the object of the invention is to create a line section, in particular for the intake tract of internal combustion engines, with optimal noise-damping properties, which is economical to manufacture and has a low vibration influence on adjacent components in the engine compartment. This object is solved by the features of claim 1.
• the suction device according to the invention has a line section which has a number of openings, these openings each having a cross section of less than 7 mm 2 .
• a larger number of openings can therefore be provided in the line section, the total cross section of all openings remaining the same or even becoming smaller.
• the influences on the components adjacent to the line section due to pulsation effects can be minimized as far as possible.
• the openings are designed as round holes. They can then be made inexpensively as bores in the wall of the line section. If the line section is made of plastic, a larger number of bores can also be made in the line section from an economic point of view. It is advantageous to provide bores with a diameter of approximately 1.5 mm. It has been shown that rows of holes, consisting of holes with a diameter of 1.5 mm in the problematic frequency range of 100-300 hearts, even have a higher degree of damping, caused by the line section, have, as a piece of fabric hose with the same dimensions as that with
• the line section consists of at least one casting, in particular of plastic.
• the openings can then be formed by an appropriate design of the casting tools. There is therefore no need for a further manufacturing step to introduce the openings.
• a round cross section of the openings can be dispensed with.
• a cross-sectional area of the openings corresponding to bores with a diameter of 1.5 mm is particularly advantageous.
• a further embodiment of the invention provides for the openings to be accommodated in the parting line between two cast parts.
• the castings can then, for. B. be plugged together by a clip connection.
• a leakage in the parting line between the castings can be accepted.
• the openings are arranged in the parting line of the housing parts, this has the advantage that only an insignificantly different design of the housing shape in the edge region is necessary for this.
• Such modifications can also be made subsequently in the mold if z. B. shows that the acoustics of a near-series intake system is still in need of improvement.
• the openings are particularly advantageous to arrange the openings in one or more rows along the flow direction of the tube. In this way, the formation of standing waves in the damping line section can be effectively reduced over a larger frequency range. This results in an attenuation over a larger frequency spectrum.
• this can have a cross section that increases in the flow direction.
• This diffuser-like design favors the air entry into the pipe section. This happens through a Recovery of speed energy from the at the entrance of the
• the cross sections of the line section can be made variable.
• the change in cross section is generated with the aid of an actuating element which represents part of the wall of the line section.
• the openings can be accommodated both in the fixed wall parts and in the control element.
• the control element can be provided for different cross-sectional profiles. It is conceivable, for. B. a variation of the opening angle of the diffuser. Another possibility is to provide a constant cross-sectional area of the line section over the length of the adjusting element, this cross-sectional area being able to be varied by actuating the adjusting element.
• Fig. 1 shows an intake manifold, which as a line section in a
• Suction device can be integrated and has holes in the wall, in longitudinal section,
• Fig. 2 is an intake manifold consisting of two snapped shells, openings being provided along the parting line and Fig. 3 shows the longitudinal section through a vario diffuser, driven by a
• the actuator is designed as a wall part with openings.
• FIG. 1 shows the basic structure of a line section 10 which is suitable for installation in a suction device for an internal combustion engine.
• the line section is used as a raw air intake and is attached to the intake device using a flange 11.
• the direction of flow is indicated by an arrow, the circular cross sections increasing linearly in the direction of flow. This results in a diffuser effect of the line section.
• a tube wall 12 is provided with four rows of bores 13, the bores each having a cross section of less than 7 mm 2 .
• the rows of holes created in this way are offset by 90 ° on the circumference of the pipe wall.
• FIG. 2 shows a cross section through the line section 10, which has essentially the same geometry as that shown in FIG. 1.
• the line section according to FIG. 2 consists of two half-shells 14 which are connected to one another by a snap connection 15.
• a parting line 16 between the half-shells 14 depressions are provided at regular intervals, which produce openings 17 in the tube wall.
• the snap connections 15 are arranged such that they act on the intake manifold shells in an area between two openings.
• FIG. 3 shows the possible configuration of a vario diffuser 18.
• This has a rectangular cross section.
• Three walls of the cross section are designed as a rigid base body 19.
• the fourth wall consists essentially of an actuating element 20 which is driven by a schematically illustrated motor 21 becomes.
• the actuating element is rotatably mounted in the base body via a hinge 22.
• the actuating element 20 is connected to the base body via a flexible wall section 23.
• the actuating element is moved about the hinge axis by the motor drive, as a result of which the linear cross-sectional change of the vario diffuser 18 in the line section 10 can be varied.
• the actuating element shears along side walls 24 of the base body.
• a seal can be provided between these two components, or a narrow sealing gap is provided. Similar to the openings 17 accommodated in the control element 20, this can be used to positively influence the intake acoustics.
• the connection between the flexible wall section 23 each with the actuating element 20 and the base body 19 can, for. B. by an adhesive connection or vulcanization.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Characterised By The Charging Evacuation (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• External Artificial Organs (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Exhaust Gas After Treatment (AREA)
• Exhaust Silencers (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7895530

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (22)

Family Cites Families (10)

• 1999
  • 1999-01-27 DE DE19903165A patent/DE19903165A1/de not_active Withdrawn
  • 1999-11-17 AT AT99958058T patent/ATE245767T1/de not_active IP Right Cessation
  • 1999-11-17 EP EP99958058A patent/EP1147304B1/fr not_active Expired - Lifetime
  • 1999-11-17 WO PCT/EP1999/008826 patent/WO2000045044A1/fr active IP Right Grant
  • 1999-11-17 ES ES99958058T patent/ES2205911T3/es not_active Expired - Lifetime
  • 1999-11-17 DE DE59906397T patent/DE59906397D1/de not_active Expired - Fee Related
• 2001
  • 2001-07-27 US US09/916,209 patent/US6520284B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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