EP0575880A1 - Verdrängerverdichter, insbesondere für pneumatische Bremssysteme - Google Patents

Verdrängerverdichter, insbesondere für pneumatische Bremssysteme Download PDF

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Publication number
EP0575880A1
EP0575880A1 EP93109608A EP93109608A EP0575880A1 EP 0575880 A1 EP0575880 A1 EP 0575880A1 EP 93109608 A EP93109608 A EP 93109608A EP 93109608 A EP93109608 A EP 93109608A EP 0575880 A1 EP0575880 A1 EP 0575880A1
Authority
EP
European Patent Office
Prior art keywords
duct
passage
piston
induction
working chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93109608A
Other languages
English (en)
French (fr)
Inventor
Antonio Rapa
Alfonso Carpinelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Heavy Vehicle Systems Italia SpA
Original Assignee
Bendix Heavy Vehicle Systems Italia SpA
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 Bendix Heavy Vehicle Systems Italia SpA filed Critical Bendix Heavy Vehicle Systems Italia SpA
Publication of EP0575880A1 publication Critical patent/EP0575880A1/de
Withdrawn legal-status Critical Current

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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
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/064—Cooling by a cooling jacket in the pump casing
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing

Definitions

  • the present invention relates to a reciprocating piston volumetric compressor, particularly for use in a motor vehicle pneumatic braking system.
  • the subject of the invention is a compressor of the type comprising:
  • a reciprocating piston compressor 2 in order to supply air under pressure to a tank 1 of a pneumatic braking system of a motor vehicle a reciprocating piston compressor 2 is used.
  • This compressor has its delivery connected to the tank 1 via a pressure regulator ("governer”) 3.
  • This latter is a device known per se and has an inlet coupling 3a connected to the delivery of the compressor 2, an outlet coupling 3b connected to the tank 1, and an exhaust coupling 3c connected to a control inlet 2c of the compressor 2.
  • the pressure regulator 3 sends air under pressure arriving from the compressor 2 to the tank 1 until the pressure in this latter reaches a predetermined value. Having reached this value air coming from the compressor 2 is directed to the exhaust connector 3c.
  • the compressor 2 comprises a body 4 in which there is formed a cylindrical working chamber 5 in which is mounted an axially translatable piston 6 operatively driven with a reciprocating motion.
  • the head 7 can conveniently be made in two parts 9 and 10 clamped together by means of screws 11 with the interposition of a gasket 12.
  • the chamber 13 communicates permanently with the atmosphere via a window or induction aperture 13a provided in the top portion 9 of the head 7.
  • the chamber 14 communicates with a window or delivery aperture indicated 14a in Figures 2 and 4.
  • Communication between the working chamber 5 and the induction chamber 13 is normally controlled by a flap shutter 20 having one end clamped between the body 4 and the portion 10 of the head and fixed to these by means of one or more fixing pins 21 ( Figure 2).
  • the other end of the flap 20 is movable in a space 42 ( Figure 2) defined between the portion 10 of the head and the top of the body 4. The height of this space defines the maximum opening movement of this flap.
  • the flap shutter 20 has two apertures 22 and 23, respectively facing apertures 17 and 19 in the portion 10 of the head between the delivery chamber 14 and the working chamber 5. Still with reference to Figure 4, a further flexible flap shutter 24 is operatively associated with the apertures 17 and 19, and controls communication between the working chamber 5 and the delivery chamber 14. This shutter is associated with an arcuate limit stop 25 the ends of which are fixed to the portion 10 of the head 7 by screws 26 and associated nuts 27.
  • the induction flap shutter 20 has a further aperture 28 facing the lower portion of the duct 18.
  • a passage 30 which extends in a direction substantially perpendicular to the direction of displacement of the piston 6 in the working chamber 5.
  • the passage 30 intersects the duct 18 as is seen in Figures 2 and 3.
  • valve piston 40 In passage 30, which conveniently has a circular section, there is slidably mounted a valve piston generally indicated 40.
  • This piston has an end portion 40a of tubular form the outer dimensions of which correspond to those of the passage 30.
  • a biasing coil spring 41 is interposed between the portion 40a of the valve member 40 and an end wall of the passage 30.
  • the valve member 40 has an intermediate portion 43 (Figure 2) of smaller diameter, and an end head 44 carrying a sealing ring 45.
  • control input 2c communicates with the end portion of the passage 30 which is situated beyond the head 44 of the valve member 40.
  • the biasing spring 41 maintains the valve member 40 in the position illustrated in Figures 2 and 3, in which the tubular portion 40a of the said member engages the intersection between the passage 30 and the duct 18 preventing communication between the induction chamber 13 and the working chamber 5 via the said duct 18.
  • the induction chamber 13 can be put into communication with the working chamber 5 only when the piston 6 is displaced downwardly and the flap shutter 20 is displaced from the lower ends of the passages 16 and 17 of the head ( Figure 3).
  • the pressure regulator 3 directs air which arrives from the compressor towards the exhaust outlet 3c. This air is passed to the control input 2c of the compressor and causes displacement of the valve member 40 towards the left, as seen in Figure 2, against the action of the spring 41. As a consequence of this displacement the reduced diameter portion 43 of the valve member 40 is disposed at the intersection between the passage 30 and the duct 18. In this way the induction chamber 13 is permanently in communication with the working chamber 5 via the duct 18 and the aperture 28 of the induction flap shutter 20 independently of the position assumed by this shutter. In this condition the compressor cycles freely with a minimum energy consumption.
  • the pressure regulator 3 interrupts communication between its connectors 3a and 3c, restoring communication between the connectors 3a and 3b and exhausting to atmosphere the duct between its connector 3c and the compressor inlet 2c.
  • the valve member 40 urged by the spring 41, returns to the position shown in Figure 2 and the compressor 2 returns to normal operation.
  • the passage 60 must necessarily be provided if, as is possible, the portion 40a of the valve member 40 is sealingly slidable in the passage 30 as a result of the fitting of one or more sealing rings in this portion 40a and/or in the passage 30.
  • a duct 50 is formed in the head 7 of the compressor for the passage of an hydraulic coolant fluid between two connectors or apertures 51 and 52 ( Figures 4 and 5) which can be used equally well for inlet and outlet of this fluid.
  • these apertures or inlet/outlet connectors for the coolant fluid are conveniently located on opposite lateral faces of the head 7 of the compressor and the duct 50 has in plan a substantially S-shaped path as seen in Figure 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP93109608A 1992-06-22 1993-06-16 Verdrängerverdichter, insbesondere für pneumatische Bremssysteme Withdrawn EP0575880A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920533A IT1259589B (it) 1992-06-22 1992-06-22 Compressore volumetrico alternativo a stantuffo, particolarmente per impianti pneumatici di frenatura.
ITTO920533 1992-06-22

Publications (1)

Publication Number Publication Date
EP0575880A1 true EP0575880A1 (de) 1993-12-29

Family

ID=11410554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109608A Withdrawn EP0575880A1 (de) 1992-06-22 1993-06-16 Verdrängerverdichter, insbesondere für pneumatische Bremssysteme

Country Status (2)

Country Link
EP (1) EP0575880A1 (de)
IT (1) IT1259589B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2416806A (en) * 2004-07-31 2006-02-08 Fluid Power Design Ltd Compressor arrangement with intercooler and air bearings
WO2009092530A2 (de) * 2008-01-22 2009-07-30 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Kompressorzylinderkopf und verfahren zur herstellung eines kompressorzylinderkopfs

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB558398A (en) * 1942-07-25 1944-01-04 Belgian Embassy Improvements in means for regulating and controlling the flow of fluid from pneumaticcompressors and hydraulic pumps
FR933048A (fr) * 1945-06-04 1948-04-08 Broom & Wade Ltd Perfectionnements aux compresseurs d'air ou de gaz
GB829060A (en) * 1957-03-30 1960-02-24 Fichtel & Sachs Ag Improvements in means for facilitating the starting of compressors
US3101187A (en) * 1960-09-12 1963-08-20 Wagner Electric Corp Fluid pressure operated piston valve
FR2422837A1 (fr) * 1978-04-10 1979-11-09 Bosch Gmbh Robert Dispositif pour le refroidissement par liquide de la culasse d'un compresseur
EP0205670A1 (de) * 1985-06-19 1986-12-30 Whirlpool International B.V. Kälte- oder Wärmepumpensystem
EP0240278A2 (de) * 1986-04-01 1987-10-07 Bendix Limited Gasverdichter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB558398A (en) * 1942-07-25 1944-01-04 Belgian Embassy Improvements in means for regulating and controlling the flow of fluid from pneumaticcompressors and hydraulic pumps
FR933048A (fr) * 1945-06-04 1948-04-08 Broom & Wade Ltd Perfectionnements aux compresseurs d'air ou de gaz
GB829060A (en) * 1957-03-30 1960-02-24 Fichtel & Sachs Ag Improvements in means for facilitating the starting of compressors
US3101187A (en) * 1960-09-12 1963-08-20 Wagner Electric Corp Fluid pressure operated piston valve
FR2422837A1 (fr) * 1978-04-10 1979-11-09 Bosch Gmbh Robert Dispositif pour le refroidissement par liquide de la culasse d'un compresseur
EP0205670A1 (de) * 1985-06-19 1986-12-30 Whirlpool International B.V. Kälte- oder Wärmepumpensystem
EP0240278A2 (de) * 1986-04-01 1987-10-07 Bendix Limited Gasverdichter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2416806A (en) * 2004-07-31 2006-02-08 Fluid Power Design Ltd Compressor arrangement with intercooler and air bearings
WO2009092530A2 (de) * 2008-01-22 2009-07-30 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Kompressorzylinderkopf und verfahren zur herstellung eines kompressorzylinderkopfs
WO2009092530A3 (de) * 2008-01-22 2010-01-07 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Kompressorzylinderkopf und verfahren zur herstellung eines kompressorzylinderkopfs

Also Published As

Publication number Publication date
ITTO920533A1 (it) 1993-12-22
ITTO920533A0 (it) 1992-06-22
IT1259589B (it) 1996-03-20

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