US3229591A - Crankcase breather - Google Patents

Crankcase breather Download PDF

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Publication number
US3229591A
US3229591A US356270A US35627064A US3229591A US 3229591 A US3229591 A US 3229591A US 356270 A US356270 A US 356270A US 35627064 A US35627064 A US 35627064A US 3229591 A US3229591 A US 3229591A
Authority
US
United States
Prior art keywords
chamber
crankcase
valve
breather
pressure
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.)
Expired - Lifetime
Application number
US356270A
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English (en)
Inventor
Cadiou Jean
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.)
Automobiles Citroen SA
Original Assignee
Andre Citroen SA
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 Andre Citroen SA filed Critical Andre Citroen SA
Application granted granted Critical
Publication of US3229591A publication Critical patent/US3229591A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/128—Crankcases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
    • F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings

Definitions

  • crankcase volume produces a variation in the inner pressure which is a cause of leakages and various disturbances.
  • the conventional solution consists in creating a negative pressure or vacuum in the crankcase.
  • crankcase breather adapted to create a vacuum in the crankcase up to velocities of rotation of, say 6,000 revolutions per minute without causing any oil to be expelled from the engine.
  • crankcase is connected with the interposition of a valve to a first chamber comprising at its lower portion a return duct leading to the crankcase, said first chamber being connected in turn with the interposition of another valve to another chamber communicating with the atmosphere.
  • valve any suitable type of valve may be used in this device.
  • FIGURES 1 and 2 show a two-stroke flat-twin engine equipped with a crankcase breather according to a first form of embodiment of this invention, the pistons being respectively in bottom dead center and top dead center positions;
  • FIGURES 3 and 4 are explanatory diagrams showing crankcase pressure variance
  • FIGURE 5 illustrates a valve suitable for carrying out this invention
  • FIGURE 6 is a longitudinal section showing a modified form of embodiment of the crankcase breather of this invention.
  • FIGURE 7 is a fragmentary view similar to FIGURE 6 but showing details on a larger scale
  • FIGURE 8 is a cross section taken upon the line VIII-- VIII of FIGURE 7.
  • the two-cylinder flat-twin engine illustrated in the drawings comprises a crankshaft 1 having its connectingrods 2, 3 attached to the pistons 4, 5 reciprocated in horizontal cylinders 6, 7.
  • crankcase 8 in which the crankshaft 1 and connecting-rods 2, 3 are mounted constitutes a capacity bounded laterally by the pistons 4, 5 and during the engine operation its volume is altered to a considerable extent from a minimum value to a maximum value as shown in FIGURES 1 and 2 in which the pistons are in their bottom dead center and top dead center positions, respectively.
  • crankcase 8 is connected through a pipe line or like duct means 9 to a compartment 10 communicating through a valve 11 with the first cham her 12 the lower portion of which is connected through a return pipe line or duct 15 to the crankcase.
  • This first chamber 12 is connected in turn through another valve 16 to another chamber 17 communicating through the nozzle 18 to the atmosphere.
  • valve 16 which may have the same adjustment as valve 11 permits the escape of air into chamber 17 and the venting of this air to the atmosphere through the pipe 18, while preventing any oil carried along into chamber 12 to escape therefrom.
  • valves may be used, notably the aerodynamic valve illustrated in FIGURE 5 and constituting the subject-matter of a French patent application filed by the same applicant on April 2, 1963, and entitled Aerodynamic Valve for High-Frequency Operation; this valve consists of a tube 19 in which a plurality of frustoconical elements 20, 21, 22 and 23 are disposed in series and inclined alternately in opposite directions.
  • crankcase breather according to the modified form of embodiment shown in FIGURES 6 to 8 of the drawings comprises a central tube 24 connected at its lower end to the crankcase and closed at its upper end by a plug or cap 25.
  • This tube 24 has a number of spaced radial holes 26 formed through its central portion at the level of a sleeve 27 of rubber or other suitable elastomer formed in turn with longitudinal slits 28 acting as a first valve means.
  • This resilient sleeve is formed with a recessed or chambered inner intermediate portion 39 extending equally above and under the holes 26 so that these holes are not closed by said sleeve in the inoperative condition; this sleeve is properly positioned along the central tube 24 by means of diametrally opposite inner studs 40 engaging corresponding holes or recesses 41 formed in the central tube 24.
  • Another valve 29 consists of a washer or disc 29 of rubber or other suitable elastomer, this washer or disc being secured along its peripheral edge by suitable means 30 on a support 31 and closing the upper portion of a chamber 32 bounded internally by a socket 33 and externally by a tube 34 connected at its lower portion to the tube 24 by means of a frustoconical portion 35; the circular inner edge of washer 29 fits tightly on the tube 24 and permits the outflow of air when the air pressure exceeds a predetermined limit value so as to lift this inner edge, the air thus released entering the chamber 36 and being vented to the atmosphere through a duct 37; at the lower frustoconical portion 35 of chamber 32, a side duct or branch pipe 38 connects this chamber to the crankcase (not shown).
  • valve means 27, 28 are substituted for the valve 11 and valve 29 is substituted for valve 16
  • first chamber consisting of tube 24 having the same function as chamber 10 in the preceding form of embodiment
  • second chamber being chamber 32 having the same function as chamber 12 of the first form of embodiment
  • chamber 36 being finally substituted for chamber 17.
  • a crankcase breather adapted to create a vacuum in a crankcase containing a crankshaft and connecting-rod assembly, which comprises a first chamber connected to said crankcase, a valve disposed between said crankcase and said first chamber, a return duct from said first chamber to said crankcase which leads from the lower portion of said first chamber, another chamber overlying said first chamber, valve means between said first chamber and said other chamber, and duct means between said other chamber and the atmosphere.
  • a crankcase breather consisting of a central tube of which the lower portion communicates with said crankcase and the upper portion is closed, said central tube having spaced radial holes formed at a common level therethrough, a valve-forming sleeve of elastic material fitting around said central tube at the level of said holes, said valve-forming sleeve having longitudinal slits formed therein which extend along one portion of its height, a first chamber surrounding said tube and said sleeve, a return duct leading from the lower portion of said first chamber to said crankcase, another chamber overlying said first chamber and also surrounding said central tube, other valve means between said chambers, and means permitting the communication between said other chamber and the atmosphere.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Check Valves (AREA)
US356270A 1963-04-03 1964-03-31 Crankcase breather Expired - Lifetime US3229591A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR930275A FR1367470A (fr) 1963-04-03 1963-04-03 Reniflard pour moteur

Publications (1)

Publication Number Publication Date
US3229591A true US3229591A (en) 1966-01-18

Family

ID=8800794

Family Applications (1)

Application Number Title Priority Date Filing Date
US356270A Expired - Lifetime US3229591A (en) 1963-04-03 1964-03-31 Crankcase breather

Country Status (7)

Country Link
US (1) US3229591A (de)
BE (1) BE645694A (de)
DE (1) DE1476106C3 (de)
ES (1) ES298186A1 (de)
FR (1) FR1367470A (de)
GB (1) GB1011385A (de)
LU (1) LU45777A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302537A (en) * 1964-05-29 1967-02-07 Borsig Ag Machine frame, especially for piston compressors and piston steam engines
US3960132A (en) * 1975-01-13 1976-06-01 Goserud Chester O Device for lubricating an internal combustion engine with powdered graphite
US5515769A (en) * 1994-06-28 1996-05-14 Carrier Corporation Air compressor
WO2017088801A1 (zh) * 2015-11-24 2017-06-01 白云龙 水平对置增程器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1184344A (en) * 1915-08-20 1916-05-23 Harley Davidson Motor Co Inc Compression-reliever for crank-cases.
US1746215A (en) * 1927-10-19 1930-02-04 Ac Spark Plug Co Crank-case-ventilator valve
US2245207A (en) * 1939-12-09 1941-06-10 Wright Aeronautical Corp Crankcase breather
US2493617A (en) * 1946-03-07 1950-01-03 Ford Motor Co Oil separator for crankcase vapors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1184344A (en) * 1915-08-20 1916-05-23 Harley Davidson Motor Co Inc Compression-reliever for crank-cases.
US1746215A (en) * 1927-10-19 1930-02-04 Ac Spark Plug Co Crank-case-ventilator valve
US2245207A (en) * 1939-12-09 1941-06-10 Wright Aeronautical Corp Crankcase breather
US2493617A (en) * 1946-03-07 1950-01-03 Ford Motor Co Oil separator for crankcase vapors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302537A (en) * 1964-05-29 1967-02-07 Borsig Ag Machine frame, especially for piston compressors and piston steam engines
US3960132A (en) * 1975-01-13 1976-06-01 Goserud Chester O Device for lubricating an internal combustion engine with powdered graphite
US5515769A (en) * 1994-06-28 1996-05-14 Carrier Corporation Air compressor
WO2017088801A1 (zh) * 2015-11-24 2017-06-01 白云龙 水平对置增程器

Also Published As

Publication number Publication date
BE645694A (de) 1964-07-16
DE1476106A1 (de) 1969-01-16
DE1476106B2 (de) 1973-03-15
GB1011385A (en) 1965-11-24
DE1476106C3 (de) 1973-10-04
LU45777A1 (de) 1964-06-01
FR1367470A (fr) 1964-07-24
ES298186A1 (es) 1964-08-16

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