WO2014100885A1 - Noise elimination or reduction system for vehicles - Google Patents

Noise elimination or reduction system for vehicles Download PDF

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Publication number
WO2014100885A1
WO2014100885A1 PCT/BR2013/000617 BR2013000617W WO2014100885A1 WO 2014100885 A1 WO2014100885 A1 WO 2014100885A1 BR 2013000617 W BR2013000617 W BR 2013000617W WO 2014100885 A1 WO2014100885 A1 WO 2014100885A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
flap
noise elimination
damping layer
conditioning
Prior art date
Application number
PCT/BR2013/000617
Other languages
French (fr)
Other versions
WO2014100885A8 (en
Inventor
Rogério PONTON
Original Assignee
Valeo Systemes Thermiques
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 Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2014100885A1 publication Critical patent/WO2014100885A1/en
Publication of WO2014100885A8 publication Critical patent/WO2014100885A8/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00664—Construction or arrangement of damper doors
    • B60H1/00671—Damper doors moved by rotation; Grilles
    • B60H1/00685—Damper doors moved by rotation; Grilles the door being a rotating disc or cylinder or part thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00664—Construction or arrangement of damper doors
    • B60H2001/00714—Details of seals of damper doors

Definitions

  • This invention relates to a noise elimination/ reduction system for vehicles and more particularly a system for eliminating or reducing noise originating from use of the air- conditioning system, of the manual type, in vehicles.
  • air-conditioning systems of the manual type give rise to a type of noise which is inconvenient to the user when the latter changes between using air from outside the vehicle and recirculating air within it, and when the user distributes air into desired directions, or again when the user changes the air temperature control.
  • Movement of the knob selecting between possibilities has the effect that the inner flap 50' of the air-conditioning system impacts against the inner part 30' of the air-conditioning assembly box, which gives rise to a highly undesirable noise, as may be seen in Figures 1 , 2A and 2B.
  • automotive air-conditioning system manufacturers may also apply a material which is over-moulded onto the rims of the flap in such a way that in addition to sealing the component it also dampens its impact against the internal part of the air- conditioning assembly box.
  • This solution is safer than the previous one, given that there is no risk of detachment of the material from the flap and consequently no risk of loss of function or starting a fire, but it is less effective in relation to noise, given that there is a large area of impact between the over-moulded material on the flap and the internal part of the air- conditioning assembly box.
  • the material used for over-moulding does not have the same impact-absorbing characteristics as a seal.
  • This invention relates to a system for eliminating or reducing noise in vehicle air- conditioning systems comprising the application of a layer of damping material to small areas of the inner flap of the air-conditioning box which first come into contact with the inner wall of this box, reducing the area of impact and consequently the noise originating from that impact, with the damping layer being of a hardness such that it provides a seal for the air- conditioning box flap in addition to damping.
  • One object of this invention is to provide damping which eliminates or at least reduces noise when changing between using outside air and recirculating air inside the vehicle, when distributing the air in the directions available, and when changing the air temperature control.
  • Another object of this invention is to provide damping which eliminates or reduces the noise originating from the air-conditioning system without prejudicing sealing of the system.
  • a noise elimination/reduction system for vehicles comprising an air-conditioning box provided with a rotatable inner flap, the flap as it rotates coming into contact with an inner wall of the air- conditioning box, the system further comprising a layer of damping material applied to areas of the flap which first come into contact with the inner wall of the air-conditioning box, the damping layer being of a hardness such that it imparts a seal to the flap of the air- conditioning box in addition to damping the impact.
  • the objects of this invention are also achieved through the provision of a method of manufacturing a system for eliminating/reducing noise for vehicles comprising the stages of determining the areas of the flap which first come into contact with the inner wall of the air- conditioning box and applying a damping layer to the specific areas of the flap which first come into contact with the inner wall of the air-conditioning box, this damping layer being of a hardness which seals the flap of the air-conditioning box in addition to providing damping.
  • Figure 1 is a perspective view of an inner flap used in the air-conditioning assembly according to one of the solutions in the prior art, indicating the large area of contact between the flap and the box, which gives rise to noise;
  • Figures 2A and 2B are perspective views of the air inlet box with its corresponding flap used in air-conditioning assemblies according to one of the solutions in the prior art;
  • Figure 3 is a perspective view of the inner flap used in the air-conditioning system including the system for eliminating noise according to this invention, indicating the small initial area of contact between the flap and the box, which reduces or eliminates noise;
  • Figure 4A is a perspective view of an air inlet box with a corresponding flap used in the air-conditioning assembly including the system for eliminating noise according to this invention
  • Figures 4B and 4C are cross-sectional views of the air inlet box with the corresponding flap including the system for eliminating noise according to this invention, indicating the initial contact.
  • FIGS 3, 4A, 4B and 4C in this application illustrate the noise elimination system 10 according to this invention which comprises a damping layer 40 applied to areas 20 of the flap (detailed) which first come into contact with the inner wall 30 of the air inlet box of the air- conditioning assembly.
  • the damping layer 40 may be made of a material from the group comprising natural or artificial polymers, or a mixture thereof.
  • the damping layer 40 comprises a natural polymer such as rubber.
  • the flap preferably has two areas 20 provided with that damping layer, one of the areas 20 first coming into contact with the inner box 30 when the air-conditioning system is changed by the user from internal air recirculating mode to the mode using outside air and vice versa, when the user distributes air in a predetermined desired direction, or when the user changes the air temperature control.
  • the damping layer 40 should be of a hardness such that it provides a seal for the inner flap 50 of the air-conditioning box, preventing odours, dust and a variety of detritus in the outside air, among others, from entering the vehicle (in the case of the recirculation/outside air control flap), preventing the escape of air to other undesired outlets (in the case of the air distribution control flap) and preventing the leakage of cold/hot air (in the case of the temperature control flap).
  • the damping layer 40 should be of a hardness preferably within the range between approximately 20 and approximately 70 Shore A and, more preferably, around approximately 45 Shore A.
  • the seal for the system 10 may be affected by the force of the air flow which will easily move that material, allowing air to leak. It will also not offer efficient noise absorption as the layer of material over-moulded on the flap 50 (in this case very soft) will not be sufficient to dampen the impact of the flap 50 against the inner box 30.
  • the flap 50 will be operated more slowly and the damping material will have to be of a particular type. If a low torque is required to rotate the knob the flap 50 will be operated more quickly and another type of damping material may be required.
  • TPE thermoplastic elastomer
  • the chattering noise between the air inlet flap and the box was significantly reduced to a substantially inaudible level, while the levels of sealing specified for the air inlet function were maintained.
  • the flap 50 is constructed eliminating plastic material from the said specific contact areas and replacing them with a damping layer as defined above.
  • the damping layer 40 should have a greater thickness than that used when it only coats the flap.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

This invention relates to a system and method for eliminating or reducing noise for air-conditioning systems in vehicles comprising an air-conditioning box fitted with an inner flap (50), comprising the application of a layer of damping material (40) to areas (20) of that flap (50) which first enter into contact with the inner wall (30) of the air-conditioning box, reducing the area of impact and consequently the noise originating from that impact, the damping layer (40) also being of a hardness such that it provides a seal for the flap (50) of the air-conditioning box in addition to damping. By way of example, the material of the damping layer (40) is a rubber of hardness of approximately 45 Shore A.

Description

"NOISE ELIMINATION OR REDUCTION SYSTEM FOR VEHICLES"
TECHNICAL FIELD
This invention relates to a noise elimination/ reduction system for vehicles and more particularly a system for eliminating or reducing noise originating from use of the air- conditioning system, of the manual type, in vehicles.
BACKGROUND TO THE INVENTION
At the present time air-conditioning systems of the manual type give rise to a type of noise which is inconvenient to the user when the latter changes between using air from outside the vehicle and recirculating air within it, and when the user distributes air into desired directions, or again when the user changes the air temperature control.
Movement of the knob selecting between possibilities has the effect that the inner flap 50' of the air-conditioning system impacts against the inner part 30' of the air-conditioning assembly box, which gives rise to a highly undesirable noise, as may be seen in Figures 1 , 2A and 2B.
At the present time automotive air-conditioning system manufacturers fit a seal adhesively bonded to the top and/or bottom part of the flap to minimise this noise, in such a way that in addition to sealing the component it also dampens its impact against the internal part of the air-conditioning assembly box. This solution is effective in terms of noise because of the impact-absorbing characteristics of the sealing material. However there is a risk that the seal might become detached from the flap, losing its function or falling within the air box or even into the vehicle's ventilation motor, which could then initiate a fire.
Alternatively automotive air-conditioning system manufacturers may also apply a material which is over-moulded onto the rims of the flap in such a way that in addition to sealing the component it also dampens its impact against the internal part of the air- conditioning assembly box. This solution is safer than the previous one, given that there is no risk of detachment of the material from the flap and consequently no risk of loss of function or starting a fire, but it is less effective in relation to noise, given that there is a large area of impact between the over-moulded material on the flap and the internal part of the air- conditioning assembly box. In addition to this, the material used for over-moulding does not have the same impact-absorbing characteristics as a seal.
SUMMARY OF THE INVENTION
This invention relates to a system for eliminating or reducing noise in vehicle air- conditioning systems comprising the application of a layer of damping material to small areas of the inner flap of the air-conditioning box which first come into contact with the inner wall of this box, reducing the area of impact and consequently the noise originating from that impact, with the damping layer being of a hardness such that it provides a seal for the air- conditioning box flap in addition to damping. One object of this invention is to provide damping which eliminates or at least reduces noise when changing between using outside air and recirculating air inside the vehicle, when distributing the air in the directions available, and when changing the air temperature control.
Another object of this invention is to provide damping which eliminates or reduces the noise originating from the air-conditioning system without prejudicing sealing of the system.
The objects of this invention are achieved through the provision of a noise elimination/reduction system for vehicles comprising an air-conditioning box provided with a rotatable inner flap, the flap as it rotates coming into contact with an inner wall of the air- conditioning box, the system further comprising a layer of damping material applied to areas of the flap which first come into contact with the inner wall of the air-conditioning box, the damping layer being of a hardness such that it imparts a seal to the flap of the air- conditioning box in addition to damping the impact.
The objects of this invention are also achieved through the provision of a method of manufacturing a system for eliminating/reducing noise for vehicles comprising the stages of determining the areas of the flap which first come into contact with the inner wall of the air- conditioning box and applying a damping layer to the specific areas of the flap which first come into contact with the inner wall of the air-conditioning box, this damping layer being of a hardness which seals the flap of the air-conditioning box in addition to providing damping.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention will be better understood on the basis of the following detailed description in conjunction with the appended drawings, in which:
Figure 1 is a perspective view of an inner flap used in the air-conditioning assembly according to one of the solutions in the prior art, indicating the large area of contact between the flap and the box, which gives rise to noise;
Figures 2A and 2B are perspective views of the air inlet box with its corresponding flap used in air-conditioning assemblies according to one of the solutions in the prior art;
Figure 3 is a perspective view of the inner flap used in the air-conditioning system including the system for eliminating noise according to this invention, indicating the small initial area of contact between the flap and the box, which reduces or eliminates noise;
Figure 4A is a perspective view of an air inlet box with a corresponding flap used in the air-conditioning assembly including the system for eliminating noise according to this invention, and
Figures 4B and 4C are cross-sectional views of the air inlet box with the corresponding flap including the system for eliminating noise according to this invention, indicating the initial contact. DETAILED DESCRIPTION OF THE INVENTION
Figures 3, 4A, 4B and 4C in this application illustrate the noise elimination system 10 according to this invention which comprises a damping layer 40 applied to areas 20 of the flap (detailed) which first come into contact with the inner wall 30 of the air inlet box of the air- conditioning assembly. The damping layer 40 may be made of a material from the group comprising natural or artificial polymers, or a mixture thereof. By way of example the damping layer 40 comprises a natural polymer such as rubber. The flap preferably has two areas 20 provided with that damping layer, one of the areas 20 first coming into contact with the inner box 30 when the air-conditioning system is changed by the user from internal air recirculating mode to the mode using outside air and vice versa, when the user distributes air in a predetermined desired direction, or when the user changes the air temperature control.
The damping layer 40 should be of a hardness such that it provides a seal for the inner flap 50 of the air-conditioning box, preventing odours, dust and a variety of detritus in the outside air, among others, from entering the vehicle (in the case of the recirculation/outside air control flap), preventing the escape of air to other undesired outlets (in the case of the air distribution control flap) and preventing the leakage of cold/hot air (in the case of the temperature control flap). For this, the damping layer 40 should be of a hardness preferably within the range between approximately 20 and approximately 70 Shore A and, more preferably, around approximately 45 Shore A.
If the hardness of the material of the damping layer 40 is very high it will be more difficult to provide a seal for the system 10, given that the material will result in the flap 50 not having sufficient compression and not closing fully. It will also not provide efficient noise absorption given that noise will be caused by impact between the plastic material of the box (normally hard PPT), and the over-moulded material on the flap (which is hard in this case).
If the hardness of the material of the damping layer 40 is very low, the seal for the system 10 may be affected by the force of the air flow which will easily move that material, allowing air to leak. It will also not offer efficient noise absorption as the layer of material over-moulded on the flap 50 (in this case very soft) will not be sufficient to dampen the impact of the flap 50 against the inner box 30.
Another factor which must be borne in mind when selecting the damping material which is to be used with the flap 50 of the air-conditioning box is the torque which has to be applied to the knob which changes between the two air-conditioning modes (recirculation/outside air), the knob which switches the distribution of air into different predetermined directions (ventilation/feet/ defrosting) or the one which changes the air temperature control (hot/cold).
If a high torque is required in order to rotate the knob the flap 50 will be operated more slowly and the damping material will have to be of a particular type. If a low torque is required to rotate the knob the flap 50 will be operated more quickly and another type of damping material may be required.
EXAMPLE
One embodiment of this invention was tested in General Motors vehicles of the Celta and Classic models, the flap 50 being defined in accordance with the following specifications:
- Base materials for the plastic box: PPT-20 (details appended)
- Base material for the flap: PPT-40 (details appended)
- Material over-moulded onto the flap: TPE (thermoplastic elastomer)
- Overall material of the flap (PPT-40 + TPE): 44.3 cm3 (51.7 g)
- Base material (PPT-40): 30.6 cm3 (35.2 g)
- Total over-moulded material (TPE): 3.7 cm3 (16.5 g)
- Material of the damping layer only (TPE): 3.4 cm3 (4.0 g)
- Overall thickness of the materials (PPT-40 and TPE): 2 + 0.2 mm.
In this example the chattering noise between the air inlet flap and the box was significantly reduced to a substantially inaudible level, while the levels of sealing specified for the air inlet function were maintained.
In an alternative embodiment of this invention, instead of a damping layer 40 coating particular areas 20 of the flap 50 of the air-conditioning box, the flap 50 is constructed eliminating plastic material from the said specific contact areas and replacing them with a damping layer as defined above. For this purpose the damping layer 40 should have a greater thickness than that used when it only coats the flap.
It should be noted that variations, modifications and amendments to the invention described in comparison with those stated are possible without going beyond the spirit and scope of this invention or equivalents thereof included in the appended claims and their equivalents.

Claims

1. Noise elimination system (10) for vehicles comprising an air-conditioning box provided with a rotatable inner flap (50), in which that flap comes into contact with an inner wall (30) of the air-conditioning system when it rotates,
the system being characterized in that it further comprises:
a damping layer (40) applied to areas (20) of the flap which first come into contact with the inner wall (30) of the air-conditioning box,
in which the damping layer (40) is of a hardness which seals the flap of the air- conditioning box in addition to damping impact.
2. Noise elimination system (10) for vehicles according to Claim 1 , characterized in that the damping layer (40) is made of a material obtained from a group which comprises a natural polymer, an artificial polymer or mixtures thereof.
3. Noise elimination system (10) for vehicles according to Claim 2, characterized in that the material of the damping layer (40) is a natural polymer.
4. Noise elimination system (10) for vehicles according to Claim 3, characterized in that the natural polymer is rubber.
5. Noise elimination system (10) for vehicles according to any one of Claims 1 to 4, characterized in that the hardness of the material of the damping layer (40) lies in the range between approximately 20 and approximately 70 Shore A.
6. Noise elimination system (10) for vehicles according to Claim 5, characterized in that the hardness of the material of the damping layer is approximately 45 Shore A.
7. Noise elimination system (10) for vehicles according to Claim 1 , characterized in that the flap (50) is selected from the group comprising the flaps for switching the air- conditioning between an internal air recirculation mode and a mode using outside air, for changing the air distribution between different predetermined directions or for changing the air temperature control.
8. Method for manufacturing a noise elimination system for vehicles comprising an air-conditioning box fitted with a rotatable inner flap, the flap coming into contact with an inner wall of the air-conditioning box as it rotates,
the method being characterized in that it comprises the stages of:
establishing the areas of the flap which first come into contact with the inner wall of the air-conditioning box, and
applying a damping layer to the defined areas of the flap which first come into contact with the inner wall of the air-conditioning box, this damping layer having a hardness which provides a seal for the flap of the air-conditioning box.
9. Method of manufacturing a noise elimination system for vehicles according to Claim 8, characterized in that the stage of applying a damping Iayer is preceded by a stage of eliminating the material which forms the areas determined to be contact areas.
PCT/BR2013/000617 2012-12-28 2013-12-27 Noise elimination or reduction system for vehicles WO2014100885A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BRBR102012033169 2012-12-28
BRBR102012033716-9A BR102012033716A2 (en) 2012-12-28 2012-12-28 Vehicle noise elimination or reduction system
BRBR1020120337169 2012-12-28

Publications (2)

Publication Number Publication Date
WO2014100885A1 true WO2014100885A1 (en) 2014-07-03
WO2014100885A8 WO2014100885A8 (en) 2015-07-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2013/000617 WO2014100885A1 (en) 2012-12-28 2013-12-27 Noise elimination or reduction system for vehicles

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BR (1) BR102012033716A2 (en)
WO (1) WO2014100885A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220136732A1 (en) * 2020-11-05 2022-05-05 Valeo Climate Control Corp. Heating ventilation and air conditioning (hvac) unit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2739252A1 (en) * 1977-08-31 1979-03-15 Kaessbohrer Fahrzeug Karl Fresh air inlet for passenger vehicle - has double flap mounted on common axis to regulate relative air-streams
FR2505010A1 (en) * 1981-05-04 1982-11-05 Valeo End seal for air conditioning pivoted damper - has shutter provided with resilient tubular sealing lips to run against bearing ends
DE8716119U1 (en) * 1987-12-05 1988-01-28 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Air flap for a heating and/or air conditioning system, in particular of a motor vehicle
EP1574375A1 (en) * 2004-03-12 2005-09-14 Inalfa Roof Systems Group B.V. Constructional element
EP1816021A1 (en) * 2006-02-01 2007-08-08 Hutchinson Watertight seal for the car or construction industries for example
DE202010013671U1 (en) * 2010-09-28 2010-12-09 Behr Gmbh & Co. Kg Automotive air conditioning system
US20120248205A1 (en) * 2011-03-29 2012-10-04 Denso International America, Inc. Door for controlling temperature and airflow distribution of a heating, ventilation, and air conditioning system in a vehicle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2739252A1 (en) * 1977-08-31 1979-03-15 Kaessbohrer Fahrzeug Karl Fresh air inlet for passenger vehicle - has double flap mounted on common axis to regulate relative air-streams
FR2505010A1 (en) * 1981-05-04 1982-11-05 Valeo End seal for air conditioning pivoted damper - has shutter provided with resilient tubular sealing lips to run against bearing ends
DE8716119U1 (en) * 1987-12-05 1988-01-28 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Air flap for a heating and/or air conditioning system, in particular of a motor vehicle
EP1574375A1 (en) * 2004-03-12 2005-09-14 Inalfa Roof Systems Group B.V. Constructional element
EP1816021A1 (en) * 2006-02-01 2007-08-08 Hutchinson Watertight seal for the car or construction industries for example
DE202010013671U1 (en) * 2010-09-28 2010-12-09 Behr Gmbh & Co. Kg Automotive air conditioning system
US20120248205A1 (en) * 2011-03-29 2012-10-04 Denso International America, Inc. Door for controlling temperature and airflow distribution of a heating, ventilation, and air conditioning system in a vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220136732A1 (en) * 2020-11-05 2022-05-05 Valeo Climate Control Corp. Heating ventilation and air conditioning (hvac) unit
US11788766B2 (en) * 2020-11-05 2023-10-17 Valeo Climate Control Corp. Heating ventilation and air conditioning (HVAC) unit

Also Published As

Publication number Publication date
WO2014100885A8 (en) 2015-07-23
BR102012033716A2 (en) 2015-06-16

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