EP1640589A1 - Schutzverkleidung für ein Zugmittelgetriebe einer Brennkraftmaschine und Anordnung einer Brennkraftmaschine mit dieser Schutzverkleidung - Google Patents

Schutzverkleidung für ein Zugmittelgetriebe einer Brennkraftmaschine und Anordnung einer Brennkraftmaschine mit dieser Schutzverkleidung Download PDF

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Publication number
EP1640589A1
EP1640589A1 EP05291717A EP05291717A EP1640589A1 EP 1640589 A1 EP1640589 A1 EP 1640589A1 EP 05291717 A EP05291717 A EP 05291717A EP 05291717 A EP05291717 A EP 05291717A EP 1640589 A1 EP1640589 A1 EP 1640589A1
Authority
EP
European Patent Office
Prior art keywords
casing
areas
facade
engine
distribution
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.)
Withdrawn
Application number
EP05291717A
Other languages
English (en)
French (fr)
Inventor
Zoran Dimitrijevic
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1640589A1 publication Critical patent/EP1640589A1/de
Withdrawn legal-status Critical Current

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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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/0073—Adaptations for fitting the engine, e.g. front-plates or bell-housings
    • 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
    • F02F7/008—Sound insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the invention relates to the automotive industry, and more particularly to the attenuation of noise emitted by internal combustion engines.
  • the distribution facade At one end of an engine is what is called the distribution facade. It is essentially the pulleys carried by the ends of the crankshaft and the camshaft (or shafts), and the timing belt which transmits to the camshaft the rotation of the crankshaft.
  • the dispensing facade may also include other pulleys on which the timing belt acts, for example to ensure the drive of the water pump. It also has rollers by which the tension and the orientation of the strands of the timing belt are adjusted.
  • crankcase isolates the distribution façade from the outside environment, in order to protect it from shocks and projections of water or oil. This housing must be able to withstand temperatures of 80 to 130 ° C.
  • distribution facade casings are often made of plastic, for example polyamide PA6. But they have the disadvantage of poorly absorb, or even amplify the noise emitted by the facade in the range 100-500Hz. This is due in part to the leakage present in the housing assembly, due to the tolerance intervals of the distribution facade. This can be remedied by sealing these leaks with gaskets, but it is an expensive solution. On the other hand, it establishes resonance phenomena between the cavity defined by the housing and the structure on which it is mounted. It can be remedied by stiffening the housing, and putting in place a support lug of the housing on the engine, which breaks the radiating mode. But again this solution is expensive.
  • the casing of the distribution facade has also been proposed to make the casing of the distribution facade in three parts.
  • the upper part is made of plastic, covered with foam on its engine support surface, and strongly alveolate on its internal face. Decoupling spacers are also provided at the fixing screws.
  • the two lower parts of the housing are made of steel so that tolerances and adjustments are well managed.
  • a portion of the housing is specifically dedicated to the insulation of the crankshaft pulley.
  • the internal faces of the various elements of the casing are covered with velvet to improve the absorption of sounds. Acoustically, this solution is effective, but it has the disadvantage of leading to a high weight of the timing case.
  • the object of the invention is to propose a new configuration for an engine fire distribution front casing, which provides good acoustic insulation of the facade while being inexpensive to manufacture and install.
  • the subject of the invention is a distribution front casing of an internal combustion engine, characterized in that it is made of a thermocompressed textile felt complex, in that it presents, on the one hand, thicker and lower density areas facing the main sources of acoustic emissions from the engine's distribution facade and, on the other hand, areas of smaller thickness and higher density.
  • its periphery is included in said areas of smaller thickness and higher density.
  • This housing can be made in several parts, the peripheral zones are preferably each included in said areas of smaller thickness and higher density.
  • At least its thicker and lower density areas may be covered with sound absorbing material.
  • the invention also relates to an assembly formed by an internal combustion engine and its distribution front casing, characterized in that said casing is of the preceding type.
  • Said areas of greater thickness and lower density of the housing are preferably located in the vicinity of at least one of the following elements: the crankshaft pulley and the longest strand of the timing belt.
  • the invention consists in producing the casing of the distribution facade in a thermocompressed textile felt complex, and in conferring on this casing, in the zones where the absorption of the low frequencies is the most necessary, thickness and compression characteristics that are particularly suitable for this absorption.
  • the casing is given a lower thickness and greater density, thus greater rigidity, which reduces acoustic leakage at the mounting areas.
  • the casing of the distribution facade is in place.
  • it consists of two parts: an upper part 10 which covers the pulleys 4, 5 and the roller 8 and a lower part 11 which covers the pulley 2 and the rollers 8, 9, and has a perforation 12 leaving the passage to the pulley 2 of the crankshaft.
  • This is only an example of configuration, and it could, in particular, consider that this housing has a single portion covering the entire facade 1, or more than two parts.
  • the two parts 10, 11 of the casing are made of a thermocompressed textile felt complex, namely an amalgam based on textile fibers comparable to those already used for the acoustic insulation of different parts of the vehicles such as engine hoods.
  • the thickness and rigidity of the material are variable depending on the areas of the portions 10, 11 of the casing concerned.
  • the areas of the parts 10, 11 of the casing which are intended to be placed facing the main noise-emitting sources have the highest thickness (of the order of 3 to 5 mm for example) and the density the lowest (of the order of 1000g / m 2 for example), obtained by a relatively low compression of the corresponding areas during the manufacture of parts 10, 11. These areas are hatched in Figure 2. These are essentially the neighborhoods the crankshaft pulley 2 and the longest strand of the timing belt 7. These characteristics are well suited to the absorption of low frequencies (100-500Hz) and the prevention of their amplification by resonance phenomena.
  • the remainder of the parts 10, 11 has a smaller thickness (of the order of 2 mm for example) and a higher density (of the order of 1200 g / m 2 for example), obtained by a relatively strong compression of corresponding areas during the manufacture of the parts 10, 11.
  • the peripheral zones of the parts 10, 11 are preferably made as well. In this way, at the periphery of the parts 10, 11 of the casing is obtained rigidity and precision in the dimensions which ensure good contact between the parts 10, 11 of the housing and the motor 1 on which they are mounted. It eliminates the best acoustic leaks.
  • FIG. 3 shows the acoustic absorption curve 13 of a PA6 polyamide reference distribution front casing, and the sound absorption curve 14 of a thermocompressed felt complex casing of the same geometry, and having, according to the invention thermocompression states modulated according to the different zones of the housing according to their situation by in relation to the main sources of noise emissions from the engine distribution panel 1.
  • the reference casing has between 100 and 500 Hz two resonant frequencies, while the absorption curve of the casing according to the invention is almost flat in the low frequencies between 100 and 400 Hz, and attests to continuously increasing absorption properties. above 400Hz. In the higher frequencies, between 600 and 3000Hz approximately, the absorbing properties of the two casings are very comparable.
  • the invention it is therefore possible to eliminate the amplification phenomena of the low frequencies (100-500Hz) due to the resonances observed with the polyamide distribution front casings, while maintaining a very good prevention of acoustic leaks and a adequate absorption of higher frequencies (500-3000Hz).
  • thermocompressed textile felt allows to divide by three the mass of the housing for a cost price that remains competitive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP05291717A 2004-09-23 2005-08-11 Schutzverkleidung für ein Zugmittelgetriebe einer Brennkraftmaschine und Anordnung einer Brennkraftmaschine mit dieser Schutzverkleidung Withdrawn EP1640589A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0410078A FR2875553B1 (fr) 2004-09-23 2004-09-23 Carter de facade de distribution d'un moteur a explosion, et ensemble forme par un moteur et ce carter

Publications (1)

Publication Number Publication Date
EP1640589A1 true EP1640589A1 (de) 2006-03-29

Family

ID=34949426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05291717A Withdrawn EP1640589A1 (de) 2004-09-23 2005-08-11 Schutzverkleidung für ein Zugmittelgetriebe einer Brennkraftmaschine und Anordnung einer Brennkraftmaschine mit dieser Schutzverkleidung

Country Status (2)

Country Link
EP (1) EP1640589A1 (de)
FR (1) FR2875553B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2485776A (en) * 2010-11-23 2012-05-30 Gm Global Tech Operations Inc Timing device cover comprising two parts
CN108691686A (zh) * 2017-04-11 2018-10-23 丰田自动车株式会社 汽缸盖罩
CN108915888A (zh) * 2018-07-19 2018-11-30 东风商用车有限公司 一种柴油机后端正时齿轮室盖系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456092A (en) * 1980-09-22 1984-06-26 Nissan Motor Co., Ltd. Noise-shielding panel for engine
US4480609A (en) * 1980-10-23 1984-11-06 Nissan Motor Company, Limited Front cover of automotive engine
JPS60206940A (ja) * 1984-03-30 1985-10-18 Honda Motor Co Ltd 内燃機関用防音カバ−
US4867335A (en) * 1988-11-30 1989-09-19 Mr. Gasket Company Timing-chain cover cap
JPH08100672A (ja) * 1994-09-30 1996-04-16 Mitsubishi Motors Corp エンジンの騒音防止カバー
EP0765737A1 (de) * 1995-03-13 1997-04-02 Sumitomo Chemical Company, Limited Geräuschdämmendes bauteil
JPH09209774A (ja) * 1996-01-30 1997-08-12 Suzuki Motor Corp 内燃機関のチエーンカバー

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456092A (en) * 1980-09-22 1984-06-26 Nissan Motor Co., Ltd. Noise-shielding panel for engine
US4480609A (en) * 1980-10-23 1984-11-06 Nissan Motor Company, Limited Front cover of automotive engine
JPS60206940A (ja) * 1984-03-30 1985-10-18 Honda Motor Co Ltd 内燃機関用防音カバ−
US4867335A (en) * 1988-11-30 1989-09-19 Mr. Gasket Company Timing-chain cover cap
JPH08100672A (ja) * 1994-09-30 1996-04-16 Mitsubishi Motors Corp エンジンの騒音防止カバー
EP0765737A1 (de) * 1995-03-13 1997-04-02 Sumitomo Chemical Company, Limited Geräuschdämmendes bauteil
JPH09209774A (ja) * 1996-01-30 1997-08-12 Suzuki Motor Corp 内燃機関のチエーンカバー

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 08 30 August 1996 (1996-08-30) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 12 25 December 1997 (1997-12-25) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2485776A (en) * 2010-11-23 2012-05-30 Gm Global Tech Operations Inc Timing device cover comprising two parts
GB2485776B (en) * 2010-11-23 2014-12-10 Gm Global Tech Operations Inc Timing device cover comprising two parts
US9004040B2 (en) 2010-11-23 2015-04-14 GM Global Technology Operations LLC Timing cover assembly for an internal combustion engine
CN108691686A (zh) * 2017-04-11 2018-10-23 丰田自动车株式会社 汽缸盖罩
CN108915888A (zh) * 2018-07-19 2018-11-30 东风商用车有限公司 一种柴油机后端正时齿轮室盖系统
CN108915888B (zh) * 2018-07-19 2023-10-20 东风商用车有限公司 一种柴油机后端正时齿轮室盖系统

Also Published As

Publication number Publication date
FR2875553A1 (fr) 2006-03-24
FR2875553B1 (fr) 2010-07-30

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