FR2967221A1 - Vacuum pump for braking assistance system of electric vehicle, has cylindrical casing containing vane rotor rotating in chamber, where air from chamber is fed into sound-proof chamber that is in form of toric chamber arranged around casing - Google Patents

Vacuum pump for braking assistance system of electric vehicle, has cylindrical casing containing vane rotor rotating in chamber, where air from chamber is fed into sound-proof chamber that is in form of toric chamber arranged around casing Download PDF

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Publication number
FR2967221A1
FR2967221A1 FR1059289A FR1059289A FR2967221A1 FR 2967221 A1 FR2967221 A1 FR 2967221A1 FR 1059289 A FR1059289 A FR 1059289A FR 1059289 A FR1059289 A FR 1059289A FR 2967221 A1 FR2967221 A1 FR 2967221A1
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France
Prior art keywords
chamber
toric
casing
pump
air
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Granted
Application number
FR1059289A
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French (fr)
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FR2967221B1 (en
Inventor
Sylvain Facchin
Nicolas Gouhier
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Renault SAS
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Renault SAS
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Publication of FR2967221B1 publication Critical patent/FR2967221B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/007—General arrangements of parts; Frames and supporting elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
    • F04B39/0072—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes characterised by assembly or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/001—Noise damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/06—Silencing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/12—Vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/13—Noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/14—Pulsations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The pump (1) has a cylindrical casing (2) containing a vane rotor rotating in a chamber, where air from the chamber escapes through an opening (5) and is fed into a sound-proof chamber (8) contiguous to the casing. The sound-proof chamber is in the form of a toric chamber arranged around the casing. A single hole (10) is formed on a front surface of the toric chamber for exhausting free air. The toric chamber is concentrically held on the casing by elastic spacers (9) that assure a space between the casing and the toric chamber. The toric chamber is made of molded plastic.

Description

Pompe à vide d'air à dispositif atténuateur de bruit, notamment pour assistance au freinage automobile Vacuum pump with noise attenuator device, especially for automotive brake assist

La présente invention concerne une pompe à vide pour véhicule 5 automobile, notamment électrique. Les systèmes d'assistance au freinage requièrent une source de vide (de dépression), très facile à prévoir sur des véhicules thermiques avec une pompe mécanique. Mais contrairement à ceux-ci, les véhicules électriques ne créent pas de vide de par leur fonctionnement et leur moteur ne tourne io pas lorsque le véhicule est immobile. Le moteur ne peut donc pas entraîner une pompe mécanique pour créer la dépression nécessaire à l'assistance au freinage. Il est donc indispensable de prévoir une source de vide commandée électriquement. À cet effet, il est connu d'utiliser une pompe à vide à palettes (ou organes d'entraînement analogues), qui comprend un is carter globalement cylindrique renfermant le rotor à palettes tournant dans une chambre adaptée : l'air y pénètre de l'extérieur par un orifice d'aspiration et s'en échappe à l'air libre par un orifice d'échappement. Le rotor est entraîné en rotation par un moteur électrique qui est généralement disposé coaxialement à la pompe.The present invention relates to a vacuum pump for a motor vehicle, especially an electric vehicle. Braking assistance systems require a source of vacuum (vacuum), very easy to predict on thermal vehicles with a mechanical pump. But unlike these, electric vehicles do not create a vacuum due to their operation and their engine does not turn when the vehicle is stationary. The engine can not therefore drive a mechanical pump to create the vacuum required for the brake assist. It is therefore essential to provide an electrically controlled vacuum source. For this purpose, it is known to use a vane vacuum pump (or similar drive members), which comprises a generally cylindrical housing enclosing the vane rotor rotating in a suitable chamber: the air enters from the outside by a suction port and escapes into the open air through an exhaust port. The rotor is rotated by an electric motor which is generally disposed coaxially with the pump.

20 Une telle pompe engendre des bruits. Il est souvent prévu de disposer, à l'intérieur même du carter, des matériaux d'isolation acoustique, comme décrit dans le document US 4747761, mais cela permet uniquement de diminuer - imparfaitement - le bruit dû au frottement des palettes sur les parois de la chambre.Such a pump generates noises. It is often intended to have acoustic insulation materials inside the casing, as described in document US Pat. No. 4,747,761, but this only makes it possible to reduce - imperfectly - the noise due to the friction of the pallets on the walls of the casing. bedroom.

25 En fait, le demandeur a identifié que le fonctionnement de la pompe engendre deux types de bruits gênants : - d'une part, un bruit d'air pulsé dû à la compression de l'air aspiré avant d'être recraché à l'air libre, dont la fréquence correspond à la vitesse de rotation de la pompe multiplié par le nombre de palettes et par deux, 30 parce qu'il y a deux aspirations/compressions/échappements par tour. - d'autre part, un bruit de frottement/sifflement mécanique dû au rayonnement acoustique du carter de pompe qui fait office de haut-parleur. Le premier bruit est néanmoins prépondérant par rapport à ce second bruit. Selon le document FR2832769, il est prévu de limiter les bruits en 35 faisant échapper l'air non pas directement à l'air libre, mais dans une chambre d'insonorisation ou d'étouffement disposée coaxialement à la pompe, d'où l'air peut à son tour s'échapper par une fente circonférentielle laissée entre la pompe et la chambre d'étouffement. Cependant, la réduction de bruit obtenue avec cette solution n'est pas suffisante. s Le but de l'invention est de proposer une autre solution d'atténuation des bruits plus performante. L'invention atteint son but grâce à une pompe à vide pour véhicule automobile, qui comprend un carter cylindrique renfermant un rotor à palettes tournant dans une chambre dont l'air s'échappe par un orifice et est io amené dans une chambre d'insonorisation attenante au carter, caractérisé que la chambre d'insonorisation est sous forme d'une chambre torique disposée autour du carter. On s'est rendu compte que cette disposition est en effet doublement favorable, d'une part en produisant une réduction efficace du niveau ls acoustique de l'air pulsé, et d'autre part en réduisant le niveau acoustique de rayonnement du carter de pompe dans les hautes fréquences, cette amélioration étant d'ailleurs plus perceptible de l'extérieur que de l'intérieur de l'habitacle. Avantageusement, la chambre torique comporte un unique trou 20 d'échappement à l'air libre, de préférence situé sur une surface frontale de la chambre torique. La chambre torique comporte avantageusement un conduit d'entrée, disposé par exemple radialement, sur lequel on peut venir brancher un tuyau de raccord venant de l'orifice d'échappement de la pompe.In fact, the applicant has identified that the operation of the pump generates two types of annoying noises: on the one hand, a pulsating air noise due to the compression of the air sucked before being spewed to the free air, the frequency of which corresponds to the speed of rotation of the pump multiplied by the number of pallets and by two, because there are two aspirations / compressions / exhausts per revolution. - On the other hand, a sound of friction / mechanical whistling due to the acoustic radiation of the pump housing which acts as a speaker. The first noise is nevertheless preponderant with respect to this second noise. According to the document FR2832769, it is intended to limit the noise by evacuating air not directly to the open air, but in a soundproofing or choking chamber arranged coaxially with the pump, hence the air can in turn escape through a circumferential slot left between the pump and the choke chamber. However, the noise reduction obtained with this solution is not sufficient. The object of the invention is to propose an alternative noise attenuation solution that is more efficient. The invention achieves its goal by means of a vacuum pump for a motor vehicle, which comprises a cylindrical casing enclosing a paddle rotor rotating in a chamber whose air escapes through an orifice and is brought into a soundproofing chamber. adjacent to the housing, characterized in that the soundproofing chamber is in the form of a toric chamber arranged around the housing. It has been found that this arrangement is indeed doubly favorable, on the one hand by producing an effective reduction of the acoustic level of the pulsed air, and on the other hand by reducing the acoustic radiation level of the pump casing. in the high frequencies, this improvement is also more noticeable from the outside than from inside the cabin. Advantageously, the toroidal chamber has a single open air exhaust hole, preferably located on a front surface of the toric chamber. The O-chamber advantageously comprises an inlet duct, arranged for example radially, on which can be connected a connecting pipe coming from the exhaust port of the pump.

25 La chambre torique est avantageusement tenue concentriquement sur le carter cylindrique de la pompe, au moyen d'entretoises élastiques laissant subsister un espace entre le carter et la chambre torique. Ces entretoises peuvent être indépendantes ou solidaires de la chambre. La chambre torique est avantageusement réalisée en matière 30 plastique moulée, par exemple par injection de polyamide. Selon une disposition avantageuse de l'invention, le volume de la chambre torique est supérieur à la cylindrée de la pompe, de manière à protéger la pompe en cas de noyage accidentel de cette partie du moteur. En effet dans une telle situation, la pompe qui est arrêtée en dépression va 35 engendrer une rétro-aspiration au travers de la chambre torique et du tuyau de raccord. Si le volume de ces deux-là dépasse la cylindrée de la pompe, cette rétro-aspiration ne fera pas pénétrer d'eau dans la pompe qui ne sera donc pas noyée. D'autres caractéristiques et avantages de l'invention ressortiront de la description suivante d'un exemple de réalisation. Il sera fait référence aux dessins annexés sur lesquels la figure unique représente de manière schématique une pompe conforme à l'invention vue de côté. La pompe 1 comprend un carter cylindrique 2 et est montée coaxialement en haut d'un moteur électrique 3 de manière que celui-ci io puisse entraîner en rotation le rotor intérieur à palettes (ou autres éléments d'actionnement analogues) non représenté disposé dans une chambre formée dans le carter 2. L'air accède à la chambre par un orifice d'entrée 4 et s'en échappe par l'orifice 5. Selon les modèles de pompe, ces orifices peuvent être disposés à divers endroits du carter 2.The toric chamber is advantageously held concentrically on the cylindrical casing of the pump, by means of elastic spacers leaving a space between the casing and the toric chamber. These spacers may be independent or integral with the chamber. The toric chamber is advantageously made of molded plastic material, for example by polyamide injection. According to an advantageous arrangement of the invention, the volume of the toric chamber is greater than the displacement of the pump, so as to protect the pump in case of accidental flooding of this part of the engine. Indeed, in such a situation, the pump which is stopped under vacuum will generate a back-suction through the toroidal chamber and the connecting pipe. If the volume of these two exceeds the cubic capacity of the pump, this retro-suction will not penetrate water into the pump which will not be flooded. Other features and advantages of the invention will emerge from the following description of an exemplary embodiment. Reference will be made to the accompanying drawings in which the single figure shows schematically a pump according to the invention viewed from the side. The pump 1 comprises a cylindrical casing 2 and is mounted coaxially at the top of an electric motor 3 so that it can drive in rotation the inner rotor with vanes (or other similar actuating elements) not shown arranged in a chamber 2 formed in the housing 2. The air accesses the chamber through an inlet port 4 and escapes through the orifice 5. According to the pump models, these orifices can be arranged at various locations in the housing 2.

15 Selon l'invention, l'orifice d'échappement 5 est relié par un tuyau de raccordement 6 à l'orifice radial 7 d'entrée d'une chambre torique 8 moulée en plastique, laquelle est disposée coaxialement de manière à entourer la paroi cylindrique du carter 2, sur une partie majeure de sa surface. La chambre torique 8 est maintenue à une légère distance de la paroi 20 cylindrique du carter grâce à des entretoises souples 9, qui sont avantageusement formées par des saillies venues de matière avec la chambre torique moulée 8. Cet écartement permet non seulement de découpler acoustiquement la chambre et le carter en évitant des contacts bruyants par vibrations, mais aussi crée un espace de refroidissement de la 25 paroi cylindrique du carter 2. La chambre 8 comporte un unique orifice d'échappement 10, sous forme d'un trou de dimensions adaptées, disposé par exemple dans la surface frontale inférieure de la chambre torique 8. Ainsi placée, la chambre torique 8 sert à la fois de silencieux en atténuant considérablement le bruit dû à l'air pulsé et d' anti-résonateur en 30 ajoutant une masse qui emprisonne la partie rayonnante du carter et modifie la longueur d'onde du rayonnement. According to the invention, the exhaust port 5 is connected by a connecting pipe 6 to the radial inlet orifice 7 of a plastic molded toric chamber 8, which is arranged coaxially so as to surround the wall cylindrical housing 2, on a major part of its surface. The toroidal chamber 8 is maintained at a slight distance from the cylindrical wall 20 of the casing by means of flexible spacers 9, which are advantageously formed by protrusions integrally formed with the molded toroidal chamber 8. This separation makes it possible not only to acoustically decouple the the chamber and the casing avoiding noisy vibrations contacts, but also creates a cooling space for the cylindrical wall of the casing 2. The chamber 8 comprises a single exhaust port 10, in the form of a hole of suitable dimensions, For example, placed in the lower front surface of the toric chamber 8. Thus placed, the toric chamber 8 serves both as a silencer by considerably reducing the noise due to the pulsed air and the anti-resonator by adding a mass which traps the radiating portion of the housing and modifies the wavelength of the radiation.

Claims (7)

REVENDICATIONS1. Pompe à vide pour véhicule automobile, qui comprend un carter cylindrique (2) renfermant un rotor à palettes tournant dans une chambre dont l'air s'échappe par un orifice (5) et est amené dans une chambre d'insonorisation (8) attenante au carter (2), caractérisé que la chambre d'insonorisation (8) est sous forme d'une chambre io torique disposée autour du carter (2). REVENDICATIONS1. Vacuum pump for a motor vehicle, comprising a cylindrical casing (2) enclosing a vane rotor rotating in a chamber, the air of which escapes through an orifice (5) and is brought into an adjoining soundproofing chamber (8) to the casing (2), characterized in that the soundproofing chamber (8) is in the form of an O-chamber disposed around the casing (2). 2. Pompe selon la revendication 1, caractérisée en ce que la chambre torique (8) comporte un unique trou (10) d'échappement à l'air libre. 15 2. Pump according to claim 1, characterized in that the toric chamber (8) has a single hole (10) of exhaust air. 15 3. Pompe selon la revendication 2, caractérisée en ce que le trou d'échappement (10) est situé sur une surface frontale de la chambre torique (2). 3. Pump according to claim 2, characterized in that the exhaust hole (10) is located on a front surface of the toric chamber (2). 4. Pompe selon l'une quelconque des revendications 1 à 3, caractérisée 20 en ce que la chambre torique (8) comporte un conduit d'entrée (7) sur lequel se branche un tuyau de raccordement (6) venant de l'orifice d'échappement (5) de la pompe. 4. Pump according to any one of claims 1 to 3, characterized in that the toroidal chamber (8) comprises an inlet duct (7) on which a connection pipe (6) coming from the orifice is connected. exhaust (5) of the pump. 5. Pompe selon l'une quelconque des revendications 1 à 4, caractérisée 25 en ce que la chambre torique (8) est tenue concentriquement sur le carter cylindrique (2) de la pompe, au moyen d'entretoises élastiques (9) laissant subsister un espace entre le carter (2) et la chambre torique (2). 30 5. Pump according to any one of claims 1 to 4, characterized in that the toric chamber (8) is held concentrically on the cylindrical housing (2) of the pump, by means of resilient spacers (9) allowing a space between the housing (2) and the toric chamber (2). 30 6. Pompe selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la chambre torique (8) est réalisée en matière plastique moulée. 6. Pump according to any one of claims 1 to 5, characterized in that the toric chamber (8) is made of molded plastic material. 7. Pompe selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le volume de la chambre torique (8) est supérieur à la cylindrée de la pompe.5 7. Pump according to any one of claims 1 to 6, characterized in that the volume of the toric chamber (8) is greater than the cubic capacity of the pump.
FR1059289A 2010-11-10 2010-11-10 AIR VACUUM PUMP WITH NOISE ATTENUATING DEVICE, IN PARTICULAR FOR AUTOMOTIVE BRAKE ASSISTANCE Expired - Fee Related FR2967221B1 (en)

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FR1059289A FR2967221B1 (en) 2010-11-10 2010-11-10 AIR VACUUM PUMP WITH NOISE ATTENUATING DEVICE, IN PARTICULAR FOR AUTOMOTIVE BRAKE ASSISTANCE

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FR1059289A FR2967221B1 (en) 2010-11-10 2010-11-10 AIR VACUUM PUMP WITH NOISE ATTENUATING DEVICE, IN PARTICULAR FOR AUTOMOTIVE BRAKE ASSISTANCE

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FR2967221B1 FR2967221B1 (en) 2016-05-27

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6062676A (en) * 1983-09-16 1985-04-10 Matsushita Electric Ind Co Ltd Sound arrester for compressor
US4747761A (en) * 1985-06-17 1988-05-31 Hitachi, Ltd. Silencer-carrying rotary vane pump
DE4239575A1 (en) * 1992-11-25 1994-05-26 Hella Kg Hueck & Co Sound absorber for pneumatic pump - is separate from pump and connected to it via snap connection and guide pins and bores

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6062676A (en) * 1983-09-16 1985-04-10 Matsushita Electric Ind Co Ltd Sound arrester for compressor
US4747761A (en) * 1985-06-17 1988-05-31 Hitachi, Ltd. Silencer-carrying rotary vane pump
DE4239575A1 (en) * 1992-11-25 1994-05-26 Hella Kg Hueck & Co Sound absorber for pneumatic pump - is separate from pump and connected to it via snap connection and guide pins and bores

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