WO2008140408A1 - A device for reducing noise from a motor vehicle and a vehicle provide with the same - Google Patents

A device for reducing noise from a motor vehicle and a vehicle provide with the same Download PDF

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Publication number
WO2008140408A1
WO2008140408A1 PCT/SE2008/050533 SE2008050533W WO2008140408A1 WO 2008140408 A1 WO2008140408 A1 WO 2008140408A1 SE 2008050533 W SE2008050533 W SE 2008050533W WO 2008140408 A1 WO2008140408 A1 WO 2008140408A1
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WO
WIPO (PCT)
Prior art keywords
cooling air
air duct
noise
engine
vehicle
Prior art date
Application number
PCT/SE2008/050533
Other languages
French (fr)
Inventor
Johan Ohlsson
Anders Folkesson
Kjell Henryson
Original Assignee
Scania Cv Ab (Publ)
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 Scania Cv Ab (Publ) filed Critical Scania Cv Ab (Publ)
Priority to EP08767144A priority Critical patent/EP2156033A4/en
Publication of WO2008140408A1 publication Critical patent/WO2008140408A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
    • 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

Definitions

  • the present invention relates to a device for damping of noise from a motor vehicle, particularly a heavy vehicle such as a bus or truck, with an engine arranged in an engine space and at least one cooling air duct arranged close thereto.
  • the invention also relates to a vehicle provided with a device for damping of noise.
  • Noise means sounds generated by the vehicle's engine or such items belonging to it as the exhaust system, cooling system etc., which noise it is desirable to eliminate or at least minimise.
  • the vehicle's engine may be a combustion engine, a fuel cell system or some other similar drive system.
  • That invention does not affect, nor is it intended to affect, the level of noise from the vehicle and its exhaust system.
  • patent EP0648924 applied for Denyo Kabushiki Kaisha refers to a noise-damping device for a water-cooled engine coupled to a generator.
  • the engine, the generator and the engine's silencer are arranged within a sound-damping casing provided with an inlet and an outlet for air.
  • the exhaust system is situated inside the casing and its outlet orifice is directed towards, and ends immediately below, the outlet grille of the sound-damping casing.
  • the object of this configuration is to damp noise from the engine, generator and exhaust system of a stationary installation.
  • the outlet pipe for exhaust gases is therefore directed upwards and outwards and ends quite close to the outlet grille. This location results in only marginal damping of noise from outflowing exhaust gases.
  • the object of the present invention is to solve said problem and provide a device for damping the noise of a vehicle, which device has few parts, is inexpensive to manufacture and fit, is easy to maintain and occupies a minimum amount of extra space in the vehicle.
  • a particular object is to damp noise generated by the engine or components associated with it such as the exhaust system, cooling system etc.
  • Figure 1 depicts a perspective view as seen obliquely from behind of a combustion engine provided with a normal silencer and a cooling air duct for damping of noise from the vehicle's combustion engine.
  • Figure 2 depicts a perspective view of the system according to Figure 1 but from the other side of the engine.
  • Figure 3 depicts a cross-section through a cooling air duct modified according to the invention for damping of noise from the vehicle's combustion engine.
  • Figure 4 depicts the cooling air duct's outlets situated on the vehicle's roof.
  • Figure 1 depicts a perspective view as seen obliquely from behind of a combustion engine 1 , preferably for a heavy motor vehicle such as a bus or truck.
  • the diagram also depicts a normally provided exhaust system 2 comprising first and second exhaust pipes 3, 4 and a silencer 5.
  • the engine installation is also provided with a noise- insulating cooling air duct 6 with a grilled inlet 7 and a grilled outlet 8.
  • FIG 2 depicts a perspective view as seen obliquely from behind of the system depicted in Figure 1 but from the other side of the engine 1.
  • This diagram shows somewhat more clearly the configuration of the cooling air duct 6.
  • Cold air is drawn in via the inlet 7, passes through the cooling air duct 6 and is blown out via the outlet 8.
  • FIG. 3 depicts a cross-section through a cooling air duct 6 modified according to the invention for damping of noise from the vehicle.
  • the cooling air duct 6 is entirely separated/demarcated from the engine 1 and its engine space (not depicted) and constitutes an airflow demarcated from the engine space.
  • the main advantage of this is that engine noise but also noise from other units and devices on and around the engine (e.g. a mechanical air conditioning compressor (not depicted), cooling fan 9 etc.) does not make its way out via the cooling air duct 6 or the cooling element 10.
  • the fact that the cooling air warmed via the cooling element 10 does not enter the engine space means that the engine space temperature is also kept down, which is important, e.g. for the service life of electronics and control units etc. situated therein. Ventilation of the engine space is nevertheless still required and may be provided by a separate cooling system (not depicted). It may for example be provided by separate fans which cool a so-called low-temperature cooling circuit intended to cool, for example, electrical components. This cooling air is thereafter led, for example, down towards the ground via apertures in the floor of the engine space. These apertures towards the ground may also be provided with noise damping.
  • a further advantage is that the orifices of the cooling air duct 6, the inlet and outlet 7, 8 respectively, may be situated on the roof of the vehicle, see Figure 4. This is to prevent noise towards the sides of the vehicle, with consequent benefit to other road users and persons in the immediate vicinity, e.g. on sidewalks, at bus stops etc. Baffles or grilles on the vehicle's roof guide the noise from the cooling air duct 6 forwards and rearwards respectively so that no one who is above the vehicle, e.g. several floors up in adjacent buildings, should be disturbed.
  • Cold air is with advantage taken in from in front, in the direction of movement of the vehicle, and warm air which has passed through the cooling air duct 6 is discharged rearwards to prevent "cycling" in the cooling system, i.e. to prevent the same warm air from circulating through the cooling air duct 6 more than once.
  • the cooling air duct 6 may be made of aluminium, sheet metal, plastic or the like. At least one cooling fan 9 and one cooling element 10 are arranged in the cooling air duct 6. The cooling fan 9 is preferably situated downstream but may also be situated upstream (not depicted) of the cooling element 10. The whole or part of the inside of the cooling air duct 6 is lined with an absorbent, a sound-damping material 11, and is therefore noise-damping.
  • the sound-absorbing material 11 may be a commercially available damping material.
  • the cooling air duct 6 is also configured to damp noise arising from the actual cooling fan 9.
  • the cooling air duct 6 is also configured with at least one, preferably two or more, angled sections 12a, b, c or bends, each preferably 60-90 degrees, resulting in a winding duct shape which causes air flows and sound waves to rebound and change direction. The result is that a substantial portion of the unwanted noise is directed towards some of the insides of the cooling air duct and towards the sound-absorbing material 11 and is damped. Fan noise or noise from the engine's exhaust gases is thus prevented from radiating directly out to the surroundings of the vehicle.
  • the cooling air duct 6 is also separated/screened from the engine 1 and the engine space, further preventing direct noise from the engine 1 from leaking out to the surroundings via the cooling air duct 6.
  • the sound-absorbing material 11 comprises perforated aluminium specially made, fitted and tuned to the noise which is intended to be damped. This involves taking into account the structural configuration of the cooling air duct 6 and the material which the cooling air duct 6 is made of.
  • the exhaust gases from the engine 1 are led via the first pipe 3 of the exhaust system 2 to the silencer 5 in which part of the exhaust noise of the engine 1 is damped out.
  • the exhaust gases are thereafter led via a second pipe 4 into the cooling air duct 6, preferably downstream of the cooling package 10 and the fan 9.
  • the exhaust gases are preferably led into the cooling air duct 6 substantially transversely to the main airflow in the cooling air duct 6.
  • the noise thus encounters the sound-absorbing material 11 in the cooling air duct 6 and is damped.
  • the same also happens to noise from, for example, the cooling fan 9. Substantially all the noise is thus directed towards a surface provided with damping material and has no "direct exit" from the cooling air duct 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention relates to a device for damping of noise from a motor vehicle with an engine arranged in an engine space and at least one cooling air duct arranged close thereto. The invention is implemented by the cooling air duct being demarcated from the engine space, the cooling air duct being at least partly provided on its inside with a sound-damping material, and by the cooling air duct being provided with at least one angled section. The invention also relates to a vehicle which comprises a device for damping of noise as above.

Description

A DEVICE FOR REDUCING NOISE FROM A MOTOR VEHICLE AND A VEHICLE PROVIDE WITH THE SAME
TECHNICAL FIELD
The present invention relates to a device for damping of noise from a motor vehicle, particularly a heavy vehicle such as a bus or truck, with an engine arranged in an engine space and at least one cooling air duct arranged close thereto. The invention also relates to a vehicle provided with a device for damping of noise. Noise means sounds generated by the vehicle's engine or such items belonging to it as the exhaust system, cooling system etc., which noise it is desirable to eliminate or at least minimise. The vehicle's engine may be a combustion engine, a fuel cell system or some other similar drive system.
BACKGROUND
The design of heavy vehicles such as buses, trucks etc. involves endeavouring to make each vehicle as quiet and comfortable as possible, particularly for persons not only inside the vehicle but also outside it or in its vicinity. Endeavours are therefore constantly made to reduce the level of noise from the vehicle, its combustion engine, drive system or other items associated therewith.
The specification of patent EP1010563 applied for by Hagglunds Vehicle AB describes an exhaust system intended to reduce thermal radiation from the exhaust gases from the combustion engine of a motor vehicle. The hot exhaust gases are led into an existing cooling air system and mixed therein with cooler air. The cold air is led in through ducts and out through, inter alia, perforated plates arranged inside the cooling air system. The primary problem solved by that invention is reducing IR radiation from, primarily, military vehicles in order to reduce the risk of detection by
Figure imgf000002_0001
heat-seeking systems. That invention does not affect, nor is it intended to affect, the level of noise from the vehicle and its exhaust system.
The specification of patent EP0648924 applied for Denyo Kabushiki Kaisha refers to a noise-damping device for a water-cooled engine coupled to a generator. The engine, the generator and the engine's silencer are arranged within a sound-damping casing provided with an inlet and an outlet for air. The exhaust system is situated inside the casing and its outlet orifice is directed towards, and ends immediately below, the outlet grille of the sound-damping casing. The object of this configuration is to damp noise from the engine, generator and exhaust system of a stationary installation. The outlet pipe for exhaust gases is therefore directed upwards and outwards and ends quite close to the outlet grille. This location results in only marginal damping of noise from outflowing exhaust gases.
SUMMARY OF THE INVENTION
The object of the present invention is to solve said problem and provide a device for damping the noise of a vehicle, which device has few parts, is inexpensive to manufacture and fit, is easy to maintain and occupies a minimum amount of extra space in the vehicle.
A particular object is to damp noise generated by the engine or components associated with it such as the exhaust system, cooling system etc.
The aforesaid and other objects are achieved according to the invention by a method and a device according to the features indicated in claims 1 and 5.
Particular features and advantages of the invention are indicated by the detailed description set out below and the attached drawings and claims.
BRIEF LIST OF THE DRAWINGS The invention is described below in the form of a preferred embodiment example with reference to the attached drawings.
Figure 1 depicts a perspective view as seen obliquely from behind of a combustion engine provided with a normal silencer and a cooling air duct for damping of noise from the vehicle's combustion engine.
Figure 2 depicts a perspective view of the system according to Figure 1 but from the other side of the engine.
Figure 3 depicts a cross-section through a cooling air duct modified according to the invention for damping of noise from the vehicle's combustion engine.
Figure 4 depicts the cooling air duct's outlets situated on the vehicle's roof.
DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 depicts a perspective view as seen obliquely from behind of a combustion engine 1 , preferably for a heavy motor vehicle such as a bus or truck. The diagram also depicts a normally provided exhaust system 2 comprising first and second exhaust pipes 3, 4 and a silencer 5. The engine installation is also provided with a noise- insulating cooling air duct 6 with a grilled inlet 7 and a grilled outlet 8.
Figure 2 depicts a perspective view as seen obliquely from behind of the system depicted in Figure 1 but from the other side of the engine 1. This diagram shows somewhat more clearly the configuration of the cooling air duct 6. Cold air is drawn in via the inlet 7, passes through the cooling air duct 6 and is blown out via the outlet 8.
Figure 3 depicts a cross-section through a cooling air duct 6 modified according to the invention for damping of noise from the vehicle. The cooling air duct 6 is entirely separated/demarcated from the engine 1 and its engine space (not depicted) and constitutes an airflow demarcated from the engine space. The main advantage of this is that engine noise but also noise from other units and devices on and around the engine (e.g. a mechanical air conditioning compressor (not depicted), cooling fan 9 etc.) does not make its way out via the cooling air duct 6 or the cooling element 10.
The fact that the cooling air warmed via the cooling element 10 does not enter the engine space means that the engine space temperature is also kept down, which is important, e.g. for the service life of electronics and control units etc. situated therein. Ventilation of the engine space is nevertheless still required and may be provided by a separate cooling system (not depicted). It may for example be provided by separate fans which cool a so-called low-temperature cooling circuit intended to cool, for example, electrical components. This cooling air is thereafter led, for example, down towards the ground via apertures in the floor of the engine space. These apertures towards the ground may also be provided with noise damping.
A further advantage is that the orifices of the cooling air duct 6, the inlet and outlet 7, 8 respectively, may be situated on the roof of the vehicle, see Figure 4. This is to prevent noise towards the sides of the vehicle, with consequent benefit to other road users and persons in the immediate vicinity, e.g. on sidewalks, at bus stops etc. Baffles or grilles on the vehicle's roof guide the noise from the cooling air duct 6 forwards and rearwards respectively so that no one who is above the vehicle, e.g. several floors up in adjacent buildings, should be disturbed.
Cold air is with advantage taken in from in front, in the direction of movement of the vehicle, and warm air which has passed through the cooling air duct 6 is discharged rearwards to prevent "cycling" in the cooling system, i.e. to prevent the same warm air from circulating through the cooling air duct 6 more than once.
An advantage of the inlet and outlet 7, 8 being situated on the roof is that the vehicle, e.g. a bus, will not need to be adapted for use in right-hand or left-hand traffic, but will have equally good noise damping irrespective of which side of the bus the passengers are in. The cooling air duct 6 may be made of aluminium, sheet metal, plastic or the like. At least one cooling fan 9 and one cooling element 10 are arranged in the cooling air duct 6. The cooling fan 9 is preferably situated downstream but may also be situated upstream (not depicted) of the cooling element 10. The whole or part of the inside of the cooling air duct 6 is lined with an absorbent, a sound-damping material 11, and is therefore noise-damping. The sound-absorbing material 11 may be a commercially available damping material.
The cooling air duct 6 is also configured to damp noise arising from the actual cooling fan 9. The cooling air duct 6 is also configured with at least one, preferably two or more, angled sections 12a, b, c or bends, each preferably 60-90 degrees, resulting in a winding duct shape which causes air flows and sound waves to rebound and change direction. The result is that a substantial portion of the unwanted noise is directed towards some of the insides of the cooling air duct and towards the sound-absorbing material 11 and is damped. Fan noise or noise from the engine's exhaust gases is thus prevented from radiating directly out to the surroundings of the vehicle. The cooling air duct 6 is also separated/screened from the engine 1 and the engine space, further preventing direct noise from the engine 1 from leaking out to the surroundings via the cooling air duct 6.
In a preferred embodiment, the sound-absorbing material 11 comprises perforated aluminium specially made, fitted and tuned to the noise which is intended to be damped. This involves taking into account the structural configuration of the cooling air duct 6 and the material which the cooling air duct 6 is made of.
The exhaust gases from the engine 1 are led via the first pipe 3 of the exhaust system 2 to the silencer 5 in which part of the exhaust noise of the engine 1 is damped out. The exhaust gases are thereafter led via a second pipe 4 into the cooling air duct 6, preferably downstream of the cooling package 10 and the fan 9. The exhaust gases are preferably led into the cooling air duct 6 substantially transversely to the main airflow in the cooling air duct 6. The noise thus encounters the sound-absorbing material 11 in the cooling air duct 6 and is damped. The same also happens to noise from, for example, the cooling fan 9. Substantially all the noise is thus directed towards a surface provided with damping material and has no "direct exit" from the cooling air duct 6.
Placing the sound-absorbing material 11 on the insides of the cooling air duct 6 results in damping of the exhaust noise before the exhaust gases and residual noise can thereafter make their way out via the outlet 8 of the cooling air duct 6. The result is good noise damping and discrete and concealed release of exhaust gases.
The invention is described above with reference to a preferred embodiment. The invention is of course not limited thereto, since other embodiments and variants of the invention are also possible within the scope of protection of the claims.

Claims

1. A device for damping of noise from a motor vehicle with an engine (1) arranged in an engine space and at least one cooling air duct (6) arranged close thereto, characterised in
- that the cooling air duct (6) is demarcated from the engine space,
- that the cooling air duct (6) is at least partly provided on its inside with a sound- damping material (11), and
- that the cooling air duct (6) is provided with at least one angled section (12a, b, c).
2. A device according to claim 1, characterised in that the exhaust system (2) of the engine (1) leads into the cooling air duct (6) and is adapted to leading exhaust gases and noise from the engine (1) into the cooling air duct (6).
3. A device according to claim 1 or 2, characterised in that the exhaust system (2) is adapted to leading into the cooling air duct (6) substantially transversely to the direction of airflow.
4. A device according to one or more of the foregoing claims, characterised in that the exhaust system (2) is adapted to leading into the cooling air duct (6) downstream of the latter's cooling fan (9) and/or cooling element (10).
5. A motor vehicle characterised in that the vehicle comprises a device for damping of noise according to any one or more of claims 1-4.
PCT/SE2008/050533 2007-05-15 2008-05-09 A device for reducing noise from a motor vehicle and a vehicle provide with the same WO2008140408A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08767144A EP2156033A4 (en) 2007-05-15 2008-05-09 A device for reducing noise from a motor vehicle and a vehicle provide with the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701195A SE531146C2 (en) 2007-05-15 2007-05-15 An apparatus for attenuating noise from a motor vehicle and a vehicle fitted therewith
SE0701195-0 2007-05-15

Publications (1)

Publication Number Publication Date
WO2008140408A1 true WO2008140408A1 (en) 2008-11-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050533 WO2008140408A1 (en) 2007-05-15 2008-05-09 A device for reducing noise from a motor vehicle and a vehicle provide with the same

Country Status (3)

Country Link
EP (1) EP2156033A4 (en)
SE (1) SE531146C2 (en)
WO (1) WO2008140408A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1208482A (en) * 1958-06-13 1960-02-24 Improvements made to the means for soundproofing groups comprising at least one heat engine and in particular generating sets
US3642092A (en) * 1968-12-10 1972-02-15 Jerzy Henryk Cederbaum Noiseless soft-running power plant
US3989415A (en) * 1973-08-27 1976-11-02 Atlas Copco Aktiebolag Silencing housing for a machine plant
US4891940A (en) * 1986-11-20 1990-01-09 Kawasaki Jukogyo Kabushiki Kaisha Muffler cooling structure for liquid-cooled engine system
EP1010563A2 (en) * 1998-12-04 2000-06-21 Hägglunds Vehicle AB Exhaust discharge system with low IR signature

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB831597A (en) * 1955-03-23 1960-03-30 John Philipp Milford Reid Improvements in cooling systems for motor vehicles
GB1338300A (en) * 1972-08-22 1973-11-21 Rolls Royce Motors Ltd Road vehicles
DE2530743C3 (en) * 1975-07-10 1980-02-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart Low-noise cooling system for trucks
IT1130274B (en) * 1979-03-13 1986-06-11 Aveling Barford Ltd MOTOR VEHICLE WITH CONSTRUCTION EQUIPMENT
DE2941093C2 (en) * 1979-10-10 1983-10-06 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart Crane vehicle, in particular a truck with a cooling system for an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1208482A (en) * 1958-06-13 1960-02-24 Improvements made to the means for soundproofing groups comprising at least one heat engine and in particular generating sets
US3642092A (en) * 1968-12-10 1972-02-15 Jerzy Henryk Cederbaum Noiseless soft-running power plant
US3989415A (en) * 1973-08-27 1976-11-02 Atlas Copco Aktiebolag Silencing housing for a machine plant
US4891940A (en) * 1986-11-20 1990-01-09 Kawasaki Jukogyo Kabushiki Kaisha Muffler cooling structure for liquid-cooled engine system
EP1010563A2 (en) * 1998-12-04 2000-06-21 Hägglunds Vehicle AB Exhaust discharge system with low IR signature

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2156033A4 *

Also Published As

Publication number Publication date
SE531146C2 (en) 2009-01-07
SE0701195L (en) 2008-11-16
EP2156033A4 (en) 2011-06-29
EP2156033A1 (en) 2010-02-24

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