FR2475156A1 - Piston vacuum pump used on automobile engines - has recessed piston retainer simplifying casing and minimising cylinder dead volume - Google Patents
Piston vacuum pump used on automobile engines - has recessed piston retainer simplifying casing and minimising cylinder dead volume Download PDFInfo
- Publication number
- FR2475156A1 FR2475156A1 FR8102191A FR8102191A FR2475156A1 FR 2475156 A1 FR2475156 A1 FR 2475156A1 FR 8102191 A FR8102191 A FR 8102191A FR 8102191 A FR8102191 A FR 8102191A FR 2475156 A1 FR2475156 A1 FR 2475156A1
- Authority
- FR
- France
- Prior art keywords
- piston
- pump
- casing
- vacuum pump
- minimising
- 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- Withdrawn
Links
Classifications
-
- 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
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/102—Adaptations or arrangements of distribution members the members being disc valves
-
- 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
- F04B39/0005—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 adaptations of pistons
-
- 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
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- 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
- F04B5/00—Machines or pumps with differential-surface pistons
- F04B5/02—Machines or pumps with differential-surface pistons with double-acting pistons
Abstract
Description
La présente invention concerne une pompe i vide à piston, notamment pour véhicules automobiles, munie d'un piston actionné au moyen d'un poussoir contre la force exercée sur lui par un ressort de rappel. The present invention relates to a vacuum piston pump, in particular for motor vehicles, provided with a piston actuated by means of a plunger against the force exerted on it by a return spring.
Des pompes de ce genre sont connues et commeroialisées. Un inconvénient des pompes de ce genre réside en ce qu'elles présentent un espace mort dû entre autres choses au fait que le poussoir est relié de telle sorte au piston qu'un écrou de fixation se trouve contre la face d'extrémité du piston. Ceci implique que le couvercle de l'enceinte de travail de la pompe comporte aussi un évidement correspondant pour recevoir cet écrou, afin que le piston, pour que le dit espace mort soit aussi petit que possible, puisse autre amené aussi près que possible de la face plane du couvercle. Pumps of this kind are known and commercialized. A disadvantage of pumps of this kind is that they have a dead space due, among other things, to the fact that the plunger is connected in such a way to the piston that a fixing nut is located against the end face of the piston. This implies that the cover of the pump's working enclosure also has a corresponding recess to receive this nut, so that the piston, so that the said dead space is as small as possible, can further be brought as close as possible to the flat side of the cover.
Etant donné que dans cette disposition on s'efforce de prévoir dans le couvercle un évidement le plus réduit possible pour ne pas accroître l'espace mort, on fabriqua le couvercle par moulage et on usine l4révidement par enlbsemett de matière pour former des arêtes vives. Ce mode de fabrication suivi d'un usinage fait que le cou veroleest d'un prix de revient relativement élevé et qu'il est lourd. Given that in this arrangement, an effort is made to provide the smallest possible recess in the cover so as not to increase the dead space, the cover is produced by molding and it is machined quickly by removing material to form sharp edges. This manufacturing method followed by machining means that the neck is relatively expensive and heavy.
Le-but de l'invention esthalors de créer une pompe à vide à piston qui, tout en présentant un espace mort réduits soit dépourvue de ces inconvénients. Pour atteindre ce but l'invention prévoit que le piston comporte, un étH dement central pour recevoir l'écrou de fixation ou la vis du poussoir, et que l'enceinte de travail supérieure de la pompe soit fermée par un couvercle en tôle plan ayant un rebord rabattu qui, au moins en que ques endroits de son pourtour, est serti dans des encoches du carter de la pompe. The object of the invention is to create a piston vacuum pump which, while having reduced dead space, is free from these drawbacks. To achieve this object, the invention provides that the piston comprises a central element for receiving the fixing nut or the screw of the pusher, and that the upper working enclosure of the pump is closed by a cover made of flat sheet metal having a folded rim which, at least in places around its periphery, is crimped into notches in the pump housing.
Le volume de l'espace mort peut encore être réduit davantage si, conformément à une autre caractéristique de l'invention, les soupapes de la deuxième enceinte de travail sont, dans le carter, disposes directement au fond du cylindre. Grtce à ces dispositions les canaux conduisant aux soupapes peuvent être raccourcis par rapport à oeux des pompes connues. The volume of the dead space can be further reduced if, in accordance with another characteristic of the invention, the valves of the second working enclosure are, in the casing, arranged directly at the bottom of the cylinder. Thanks to these provisions the channels leading to the valves can be shortened compared to those of known pumps.
Un exemple d'exéoution de l'intention est décrit en détail ci-après et avec référence au dessin schéma tique annexé dont la figure unique est une vue en coupe d'une pompe à vide à piston présentant les caraotéristiques revendiquées. An example of carrying out the intention is described in detail below and with reference to the accompanying drawing of the tick diagram, the single figure of which is a sectional view of a piston vacuum pump having the claimed characteristics.
Le pousaoir à mouvement de va-et-vient 1 traverse le fond cylindrique 3 à travers une bague d'étanchéité 2. The push-button with reciprocating movement 1 crosses the cylindrical bottom 3 through a sealing ring 2.
Un ou plusieurs ressorts de rappel 5 stopposent au dd- placement du poussoir 1 avec le piston 7 en direction du couvercle. Dans le carter 4 est prévue enceinte 6 du cylindre dans laquelle le piston 7 fixé à ltextrd- mité du poussoir 1 peut se déplacer. Ce piston comporte un alésage central 8 dans lequel est disposé un écrou ou une vis de fixation 9 qui assure la liaison entre le poussoir et le piston. Des bagues 10 assurent l'étan- chéité entre le piston et la paroi oylindrique du carter.One or more return springs 5 stop the movement of the pusher 1 with the piston 7 in the direction of the cover. In the casing 4 is provided enclosure 6 of the cylinder in which the piston 7 fixed to the end of the pusher 1 can move. This piston has a central bore 8 in which is placed a nut or a fixing screw 9 which provides the connection between the pusher and the piston. Rings 10 ensure the seal between the piston and the cylindrical wall of the casing.
Ces bagues peuvent titre appliquées contre la dite paroi grace à leur propre effet de ressort t en variante < à gauche sur le dessin) elles peuvent être maintenues repoussées contre la dite paroi au moyen d'un élément élastique lie
Le piston 7 subdivise l'enceinte 6 du cylindre en une enceinte de travail inférieure 12 et en une enceinte de travail supérieure 13. La pompe est A double effet.These rings can title applied against said wall thanks to their own spring effect t as a variant <on the left in the drawing) they can be kept pushed against said wall by means of an elastic element links
The piston 7 subdivides the enclosure 6 of the cylinder into a lower working enclosure 12 and into an upper working enclosure 13. The pump is double acting.
L'enceinte de travail supérieure 13 est fermée par un couvercle plan i4 en t81e qui comporte un rebord 15 qui, au moins en quelques endroits de son pourtour, est serti dans des encoches du carter 4 dé la pOmpOn Un organe d'étanchóité peut être disposé entre ce carter et son couvercle. La pompe comporte un raccord vissé 17 auquel est reliée une conduite 18 allant à un appareil de consommation de vide, par exemple à un amplificateur d'effort de freinage. Ce raccord vissé 17 est équipé d'un clapet de retenue 20 de la pression hydraulique; soumis à l'action d'un ressort 19 en direction opposee à celle de l'écoulement.Ce clapet 20 comporte au moins trois nervures de guidage 21 qui le guident en coulissant dans l'alésage 22. La conduite 18 est ainsi raccordée à une enceinte d'admission 23 avec laquelle oommunl- quent les soupapes d'admission supérieure 24 et infé rieur 25. Celles-ci sont conçues en tant que soupapes de retenue soumises à l'action dtun ressorts de meme que les soupapes de refoulement supérieure 26 et inférieure 27. En ce qui concerne la représentation graphique de la pompe il faut observer que les soupapes supérieures 24-et 26 ont, pour une meilleure lisibilité du dessin, été ramenées de l'arrière dans le plan du dessin. En réalité elles sont tout pro ches de la paroi extérieure du cylindre.Les soupapes de refoulement 26, 27 évacuent dans une enceinte 28 qui communique avec l'atmosphère. The upper working enclosure 13 is closed by a flat cover i4 in t81e which has a flange 15 which, at least in a few places around its periphery, is crimped into notches in the casing 4 of the pOmpOn A sealing member can be disposed between this casing and its cover. The pump comprises a screw connection 17 to which is connected a line 18 going to a vacuum consumption device, for example to a brake force amplifier. This screw connection 17 is equipped with a check valve 20 for the hydraulic pressure; subjected to the action of a spring 19 in the direction opposite to that of the flow. This valve 20 comprises at least three guide ribs 21 which guide it by sliding in the bore 22. The pipe 18 is thus connected to a inlet enclosure 23 with which the upper 24 and lower inlet 25 valves communicate. These are designed as check valves subjected to the action of a spring, as are the upper discharge valves 26 and lower 27. With regard to the graphic representation of the pump, it should be observed that the upper valves 24 and 26 have, for better readability of the drawing, been brought from the rear in the plane of the drawing. In reality, they are very close to the outer wall of the cylinder. The discharge valves 26, 27 evacuate in an enclosure 28 which communicates with the atmosphere.
On voit que 11 enceinte de travail inférieure 12 ne présente qutun petit espace mort, car celui-ci n'est formé pratiquement qu'entre 1'enceinte de travail 12 et la soupape < 'admission 25 t cet espace mort est consti- tué par l'alésage 29 et le logement 30 du ressort de cette soupape. La disposition est comparable en ce qui concerne la soupape d'admission supérieure 24. Cependant, dans le cas de cette dernière, à la plaoe de 1'alésage 29 se trouve un canal 31 entre le couvercle 14 et un évidement dans le carter 4. Un canal analogue 32 conduit à la soupape d'évacuation 26. Le mode de fonctionnement de cette pompe à vide à double effet correspond à celui des pompes de ce type déjà en service. It can be seen that the lower working enclosure 12 has only a small dead space, since this is formed practically only between the working enclosure 12 and the inlet valve 25 and this dead space is constituted by the bore 29 and the housing 30 of the spring of this valve. The arrangement is comparable as regards the upper intake valve 24. However, in the case of the latter, at the plate of the bore 29 is a channel 31 between the cover 14 and a recess in the casing 4. An analog channel 32 leads to the discharge valve 26. The operating mode of this double-acting vacuum pump corresponds to that of pumps of this type already in service.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19808002722U DE8002722U1 (en) | 1980-02-02 | 1980-02-02 | PISTON VACUUM PUMP |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2475156A1 true FR2475156A1 (en) | 1981-08-07 |
Family
ID=6712541
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8102191A Withdrawn FR2475156A1 (en) | 1980-02-02 | 1981-02-02 | Piston vacuum pump used on automobile engines - has recessed piston retainer simplifying casing and minimising cylinder dead volume |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE8002722U1 (en) |
ES (1) | ES255194Y (en) |
FR (1) | FR2475156A1 (en) |
IT (1) | IT1142240B (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB203948A (en) * | 1922-11-01 | 1923-09-20 | Frederick James Payne | Improvements in inflating and like air pumps |
US2596004A (en) * | 1947-01-24 | 1952-05-06 | Phillips Petroleum Co | Clearance pocket type compressor piston |
US3215086A (en) * | 1962-06-01 | 1965-11-02 | Ingersoll Rand Co | Variable bore cylinder |
-
1980
- 1980-02-02 DE DE19808002722U patent/DE8002722U1/en not_active Expired
- 1980-12-22 ES ES1980255194U patent/ES255194Y/en not_active Expired
-
1981
- 1981-01-23 IT IT47631/81A patent/IT1142240B/en active
- 1981-02-02 FR FR8102191A patent/FR2475156A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB203948A (en) * | 1922-11-01 | 1923-09-20 | Frederick James Payne | Improvements in inflating and like air pumps |
US2596004A (en) * | 1947-01-24 | 1952-05-06 | Phillips Petroleum Co | Clearance pocket type compressor piston |
US3215086A (en) * | 1962-06-01 | 1965-11-02 | Ingersoll Rand Co | Variable bore cylinder |
Also Published As
Publication number | Publication date |
---|---|
IT8147631A0 (en) | 1981-01-23 |
ES255194Y (en) | 1981-11-16 |
DE8002722U1 (en) | 1980-05-14 |
ES255194U (en) | 1981-05-01 |
IT1142240B (en) | 1986-10-08 |
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Date | Code | Title | Description |
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ST | Notification of lapse |