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US3260250A - Internal combustion engines - Google Patents

Internal combustion engines Download PDF

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Publication number
US3260250A
US3260250A US360243A US36024364A US3260250A US 3260250 A US3260250 A US 3260250A US 360243 A US360243 A US 360243A US 36024364 A US36024364 A US 36024364A US 3260250 A US3260250 A US 3260250A
Authority
US
United States
Prior art keywords
carburetter
engine
pipe
crankcase
throttle valve
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
US360243A
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English (en)
Inventor
Swaine John
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.)
Rover Co Ltd
Original Assignee
Rover Co Ltd
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 Rover Co Ltd filed Critical Rover Co Ltd
Application granted granted Critical
Publication of US3260250A publication Critical patent/US3260250A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
    • 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
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • 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

Definitions

  • crankcase breather To eliminate this source of atmospheric pollution it has been proposed to blank olf the crankcase breather and to connect the crankcase by means of a pipe to one or other of a number of possible points in the induction system of the engine so that the depression in the induction system would draw the fumes into the cylinders of the engine to be consumed.
  • One such proposal has been to connect a pipe from the crankcase to the air cleaner that is usually provided at the inlet to the induction system; the depression here is only small and is often insucient for the purpose of reliably drawing in the fumes from the crankcase. This arrangement is moreover unsatisfactory since it produces undesirable deposits of carbonaceous material and moisture in the air cleaner and in the carburetter.
  • a movable air valve member is actuated by a piston or diaphragm that responds to the pressure prevailing irnmediately downstream of the venturi in such a manner as to keep that pressure substantially constant.
  • the throttle valve When the throttle valve is wide open, producing little or no pressure drop, then the air valve is likewise open and the depression is small. But when the throttle valve is closed or nearly closed, producing a large depression in the induction manifold, the pressure drop is chiefly across the throttle valve itself and so the depression between the carburetter air valve and the throttle valve is still small.
  • crankcase fumes are introduced into the induction system downstream of the venturi there is no contamination of the fuel-metering section of the carburetter by deposits from the fumes.
  • FIGURE 1 is a plan view of an engine to which the invention is applied;
  • FIGURE 2 is a plan view of the carburetter of the engine of FIGURE l;
  • FIGURE 3 is a partly sectioned side view of the carburetter
  • FIGURE 4 is a scrap section on the line 4-4 in FIG- URE 2;
  • FIGURE 5 is a scrap horizontal section through a portion of the front wall of the crankcase of the engine, showing the crankcase end of the pipe.
  • the engine illustrated in FIGURE 1 is a four-cylinder in-line engine with its cylinders upright. Its induction manifold 1 receives a fuel-air mixture from a carburetter 2 which receives its air through an induction pipe 3 and air cleaner 4. A breather pipe S connects a llame trap 6 on the valve cover 7 of the engine to the air cleaner 4.
  • a pipe 8 extends across the front of the engine to a point in the body of the carburetter 2.
  • a flame-trap 9 comprising simply a casing containing a bark of metal gauze to eliminate the possibility of any flame, that might arise in the induction system through a fault, reaching the crankcase.
  • the carburetter 2 is of a well-known commercially available type in which an air valve member 10 is vertically movable, carrying with it a tapered needle valve 10A controlling the flow of fuel into the venturi formed by the space under the member 10.
  • the member 10 is shown in its lowest position, and it is lifted by the action of a piston 11 of which the underside is exposed to the atmospheric pressure or to the pressure prevailing in the intake side 12 of the carburetter whilst the upper surface is exposed through a passage 12A to the pressure prevailing downstream (to the right in FIGURE 3) of the venturi.
  • throttle valve 13 Also mounted in the carburetter body, a short way downstream of the air valve member 10, is the throttle valve 13 in the form of a diametrally pivoted buttery valve.
  • the pipe 8 communicates with the space in the carburetter body between the air valve member 10 and the throttle valve 13 through a short tube 14 received in a drilled boss 15 formed in the body.
  • the tube 14 enters the body above the level of its axis and at a downwardly inclined angle of about forty-five degrees to the horizontal. Furthermore it will be noted that the tube is so placed that, as indicated in FIGURE 3, the edge of the throttle valve 13 passes over the end of the tube as the throttle is approaching its fully open position.
  • the optimum position for the tube 14 is best found by experiment for each individual engine, carburetter and induction manifold combination. We prefer to mount the tube above the level of the centre of the induction tract in order to reduce the possibility of liquid fuel that lies in the bottom of the tract finding its way into the tube.
  • position illustrated which is asymmetric with respect to the throttle valve 13
  • the tube can open into the induction tract at a point on its vertical plane of symmetry. This can be done by bringing in the tube horizontally to break tangentially into the induction tract at its lowermost point.
  • the tube can be inclined slightly downwards towards the carburetter.
  • carburetter with a sliding piston has been illustrated, it will be ⁇ appreciated that the invention may be applied to any other carburetter of the so-called constant vacuum or constant depression type, for example, to that type in which the movement of a variable air valve member is angular rather than linear and/or is controlled by a diaphragm rather than a piston.
  • FIGURE 5 shows the arrangement used in the example under consideration at the crankcase end of the pipe 8 to reduce or eliminate the likelihood of oil from the crank-case being sucked up the pipe 8.
  • the pipe 8 is fitted over a spigot member 16 which is mounted in a disc 17 that is pushed into an opening in the front wall of the crankcase extension and the inner end of the member 18, which is bell-mouthed, lies opposite the end of a shaft (not shown) that lies within the crankcase and is used to drive auxiliary components of the engine.
  • a cup-shaped pressing 18 is secured on the end of the shaft by a nut 19 that holds a chain sprocket 20 on the shaft and this pressing 18, rotating with the shaft, acts as an oil slinger to throw clear any oil that approaches the region of the intake end of the spigot member 16, thus ensuring that only substantially oil-free air is drawn up the pipe 8.
  • pipe 8 need not necessarily be connected to the cranlccase itself or even to an extension of it, but it could be connected to any part of the interior of the engine from which fumes are to .be withdrawn.
  • an internal combustion engine an induction system feeding said engine, a carburetter of the yconstant-depression type ⁇ connected to said induction system, a variable air valve in said carburetter, a throttle valve disposed between said air valve and said induction system, and a -breather pipe, one end of said pipe communicating with the interior of said engine and the other end of said pipe ⁇ communicating with the interior of said carburetter at a point between said air Valve and said throttle valve.
  • an internal-combustion engine having a crankcase, an induction system feeding said engine, a carburetter of the constant-depression type connected to said induction system, a variable air valve in said carburetter, a throttle valve disposed between said air Valve and said induction system, and a breather pipe, one end of said pipe communicating with the erankcase of said engine and the other end of said pipe communicating with the interior of said carburetter at a point between said air valve and said throttle valve.
  • an internal combustion engine having a crankcase, an induction system defining a pasage between atmosphere and the intake of said engine, a carburetter of the constant depression type comprising a variable air valve disposed in said passage, a throttle valve in said passage between said air valve and said engine, and a pipe forming a communication between the crankcase of said engine and a point in said passage between said air Valve and said throttle Valve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
US360243A 1963-04-18 1964-04-16 Internal combustion engines Expired - Lifetime US3260250A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15252/63A GB1014746A (en) 1963-04-18 1963-04-18 Internal combustion engines and crankcase ventilation systems therefor

Publications (1)

Publication Number Publication Date
US3260250A true US3260250A (en) 1966-07-12

Family

ID=10055765

Family Applications (1)

Application Number Title Priority Date Filing Date
US360243A Expired - Lifetime US3260250A (en) 1963-04-18 1964-04-16 Internal combustion engines

Country Status (3)

Country Link
US (1) US3260250A (es)
ES (1) ES298813A1 (es)
GB (1) GB1014746A (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595211A (en) * 1970-07-20 1971-07-27 Ford Motor Co Internal combustion engine air intake control means
SE512108C2 (sv) 1997-04-29 2000-01-24 Volvo Lastvagnar Ab Förbränningsmotor med en ventilationsanordning för att släppa ut förbränningsgaser från vevhuset

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1305036A (en) * 1919-05-27 of detroit
US1654147A (en) * 1926-12-13 1927-12-27 James D Shannon Crank-case ventilator
US2363223A (en) * 1941-05-15 1944-11-21 Bonnier Claude Etienne Carburetor
US2737935A (en) * 1953-01-09 1956-03-13 Gen Motors Corp Crankcase ventilator
US2906252A (en) * 1956-08-28 1959-09-29 Int Harvester Co Crankcase ventilating system for internal combustion engines
DE1097755B (de) * 1958-05-17 1961-01-19 Daimler Benz Ag Vorrichtung zur Entlueftung von Brennkraftmaschinen
FR1299060A (fr) * 1961-06-08 1962-07-20 Simca Automobiles Sa Perfectionnements apportés aux moteurs à explosion
US3111120A (en) * 1961-09-01 1963-11-19 Chrysler Corp Engine crankcase ventilation system
US3116727A (en) * 1963-02-04 1964-01-07 Gen Motors Corp Crankcase ventilating system
US3147320A (en) * 1961-05-16 1964-09-01 Enginering Res And Applic Ltd Carburetors
US3167060A (en) * 1962-09-14 1965-01-26 Walker Mfg Co Exhaust system

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1305036A (en) * 1919-05-27 of detroit
US1654147A (en) * 1926-12-13 1927-12-27 James D Shannon Crank-case ventilator
US2363223A (en) * 1941-05-15 1944-11-21 Bonnier Claude Etienne Carburetor
US2737935A (en) * 1953-01-09 1956-03-13 Gen Motors Corp Crankcase ventilator
US2906252A (en) * 1956-08-28 1959-09-29 Int Harvester Co Crankcase ventilating system for internal combustion engines
DE1097755B (de) * 1958-05-17 1961-01-19 Daimler Benz Ag Vorrichtung zur Entlueftung von Brennkraftmaschinen
US3147320A (en) * 1961-05-16 1964-09-01 Enginering Res And Applic Ltd Carburetors
FR1299060A (fr) * 1961-06-08 1962-07-20 Simca Automobiles Sa Perfectionnements apportés aux moteurs à explosion
US3111120A (en) * 1961-09-01 1963-11-19 Chrysler Corp Engine crankcase ventilation system
US3167060A (en) * 1962-09-14 1965-01-26 Walker Mfg Co Exhaust system
US3116727A (en) * 1963-02-04 1964-01-07 Gen Motors Corp Crankcase ventilating system

Also Published As

Publication number Publication date
GB1014746A (en) 1965-12-31
ES298813A1 (es) 1964-10-16

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