US3353801A - Hot start venting - Google Patents
Hot start venting Download PDFInfo
- Publication number
- US3353801A US3353801A US545389A US54538966A US3353801A US 3353801 A US3353801 A US 3353801A US 545389 A US545389 A US 545389A US 54538966 A US54538966 A US 54538966A US 3353801 A US3353801 A US 3353801A
- Authority
- US
- United States
- Prior art keywords
- valve
- conduit
- fuel
- throttle
- vent
- 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
Links
- 238000013022 venting Methods 0.000 title claims description 6
- 230000006698 induction Effects 0.000 claims description 30
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 41
- 238000010276 construction Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
- F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
- F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
Definitions
- This invention relates to vehicle safety and in particular to automatic hot start vent means for venting the fuel-air induction conduit of an internal combustion engine at a location above the customary throttle valve when the latter is at its idle position.
- a hot start vent to atmosphere from the induction conduit above the throttle valve is commonly employed to overcome this problem.
- the rapid pressure build-up sometimes blows fire back through the inlet manifold and carburetor induction condit, then through the hot start vent to ignite combustible materials that are sometimes allowed to accumulate adjacent the area of the vent opening.
- the throttle is at its closed or idle position during starting, no backfire problem exists, and also the throttle itself also serves as a barrier to backfire.
- Reference herein to the throttle or throttle valve in the idle position means in the closed position, whereat. some air leakage in the induction conduit past the throttle valve sometimes exists.
- An object of the present invention has been to provide an improved hot start vent system for an automobile induction conduit which automatically closes when the throttle is partially open from its idle position, so as to prevent backfire through the vent, and which automatically opens when the throttle is returned to its closed or idle position.
- FIGURE 1 is a fragmentary vetrical sectional view through a carburetor induction conduit, showing an embodiment of the present invention with the throttle valve closed and the vent valve open.
- FIGURE 2 is a view similar to FIGURE 1, but showing a modification and also showing the throttle valve in a partially open position and the vent valve closed.
- FIGURE 3 is a fragmentary sectional view taken in the direction of the arrows substantially along the line 3-3 of FIGURE 1.
- FIGURE 4 is a fragmentary sectional view taken in the direction of the arrows substantially along the broken line 44 of FIGURE 1.
- the carburetor may be of conventional construction and includes an air induction conduit 10 defined by several parts cast for example from aluminum or zinc alloys, including an upper air inlet or air horn section 11 which contains the usual choke valve and is adapted at its upper end for attachment with an air filter, an intermediate venturi section 12 containing a coaxial large venturi 13 and a coaxial small venturi 14, and a throttle body 15 which contains a throttle blade or valve 16 mounted on a diametrical shaft 17 journaled at opposite ends within the sidewalls of the throttle body 15.
- an air induction conduit 10 defined by several parts cast for example from aluminum or zinc alloys, including an upper air inlet or air horn section 11 which contains the usual choke valve and is adapted at its upper end for attachment with an air filter, an intermediate venturi section 12 containing a coaxial large venturi 13 and a coaxial small venturi 14, and a throttle body 15 which contains a throttle blade or valve 16 mounted on a diametrical shaft 17 journaled at opposite ends within the sidewalls of the throttle body 15.
- the throttle blade 16 is secured to the shaft 17 by screws 18 and controls the air flow inthe induction conduit 10 in accordance with conventional practice.
- the parts 11, 12, and 15 are suitably spaced by fibrous gaskets apertured so as not to obstruct the continuous induction conduit 10 extending through thes parts and are secured together by bolts, not shown.
- a suitable fibrous gasket also spaces the throttle body 15 from the manifold 19.
- the intermediate venturi portion 12 may be cast integrally with a fuel bowl portion 20 into which fuel is supplied from a fuel pump and may be maintained at approximately a constant level 20a by a customary float controlled valve in the fuel supply line. Fuel from the bowl 20 is conducted through a metering element 21 and a main fuel supply conduit 22 to a well 23 formed in a sidewall portion of the induction conduit 10 defined by the intermediate section 12.
- the fuel bowl 20 is customarily vented to atmosphere at a location within the air horn 11 and below the air fil ter.
- the fuel flow from bowl 20 to the well 23 is induced by the force of gravity and the pressure difierential existing on the fuel resulting from the low pressure in Well 23 when air is flowing in conduit 10.
- the well 23 opens into the air stream to the venturi section 12 by means of a 15 is supported by the metering orifice 24 at the upper end of an aeration tube 25, which extends into the well 23 and is provided with a plurality of sidewall openings 26.
- the upper portion of the well 23 is connected at a location above the normal fuel level 20a in the bowl 20 with a primary fuel nozzle 27 bymeans of a duct 28 in the support portion 29 for the small venturi 14.
- the support 29' is secured to the sidewall of the section 12 and cooperates therewith to define an upper portion of Well 23.
- the air flow in conduit Upon opening of the throttle valve 16 while the engine is operating, the air flow in conduit induces a low pressure Within venturi 14 at the discharge end of nozzle 27, which causes the fuel level Within the well 23 to rise above the normal level 20a and enter the passage 28 and discharge through nozzle 27.
- the fuel flow to well 23 via metering element 21 and conduit 22' is controlled in accordance with demand by a metering rod having its upper end secured to a piston 31 reciprocal in a vertical cylinder 32 and yieldingly urged upwardly by a coil spring 33.
- the lower end of cylinder 32 below piston 31 is connected by suitable conduit means (not shown) with the induction conduit 10 at a location below the throttle valve 16.
- the piston 31 is urged downwardly with decreasing pressure downstream of the throttle valve 16, i.e., as the latter closes.
- the throttle valve 16 progressively opens and the pressure downstream thereof increases, the metering rod 30 will be moved upwardly as aforesaid by spring 33.
- the lower end of metering rod 30' is guided by element 21 to progressively open or close the communication between fuel bowl 2'0 and conduit 22 in accordance with theupward or downward movement of rod 30.
- a transfer port 40 comprising a vertically elongated slot extends through the sidewall of the throttle body 15 from' the idle fuel passage 35 into the induction conduit 10 at a location extending from slightly below to somewhat above the upper edge of the throttle valve: 16 when the latter is at its closed or idle position. Accordingly, upon the initial opening of the throttle blade or valve 16, a greater portion of the slotted transfer port 40 will be exposed to supply fuelinto the: conduit 10 downstream of the throttle valve 16.
- a cylindrical valve guide passage or bore 41 is provided vertically in the sidewall of the upper portion of the throttle body 15 so as to intersect the induction conduit 10 along a vertical slot 42, FIGURES 3 and 4, which terminates at its lower end adjacent the lower edge of throttle blade 16 in the closed position shown, FIGURE 1.
- the lower end of the bore 41 which latter may be formed by casting during the initial fabrication of the throttle body 15, tapers at 43 to provide a coaxial valve seat adjacent the lower edge of the throttle valve 16 when the latter is at the closed position, FIG- URE' 1.
- a port 44 which communicates withthe inner end of a lateral vent duct 45.v The latter extends from port 44 horizontally through the sidewall of throttle body 15 to the atmosphere.
- a ball or spherical check valve 46 is confined within the cylinder 41 in vertically guided relation and is urged by gravity to a seated position at the tapered seat 43 so as to close. port 44, thereby to block communication between the induction conduit 10 and the atmosphere via slot 42, port 44, and duct 45.
- the diameter of ball 46 is only slightly less than the diameter of cylinder 41, so that a portion of ball 46 projects through slot 42 into conduit 10.
- a radially extending valve lifter 47 is suitably secured, as for example by welding or soldering, to the upper surface of valve 16 and extends toward ball 46 to underlie the portion thereof which projects into conduit 10, thereby to raise and unseat the ball 46 from the port 44 when the throttle valve 16 is moved to its closed or idle position. Accordingly, fuel vapor which might otherwise collect within the chamber 10 above the throttle valve 16 is vented through slot 42 below the raised ball 46 and then through port 44 and conduit 45 to atmosphere.
- throttle valve 16 is partially open, as for example during starting of the engine, ball 46 is seated at 43 to close port 44 and prevent the possibility of back-firing through vent duct 45, FIGURE 2.
- FIGURES l and 2 are identical in concept and in operation, except that in lieu of vent duct 45 comprising a hole extending into the sidewall of throttle body 15,. the lower end or base of the throttle body- 15- isformed with a downwardly opening groove 45a extending outwardly from: the port 44.
- the gasket separating these members cooperates with the groove or slot 45a to provide a vent passage similar in. all other respects to the vent conduit 45 of FIGURE 1.
- the structurecomprising the groove 45a opening downwardly at the base of the throttle body 15 enables certain economies in construction and may be readily formed. during the casting of the throttle body 15.
- the construction illustrated in FIGURE 1, comprising the conduit 45 contained entirely within the throttle body 15, has the advantage of dimensional stability and is independent of dimensional changes that might take place in the gasket. separating. the throttle body 15 from the manifold 19-.
- a carburetor for an internal combustion engine a throttle body, a fuel-air induction conduit extending through said throttle body, throttle valve means having a valve element in said conduit movable between idle and open positions for controlling fluid flow in said conduit, means for venting gases in said conduit above said valve element to asmospheric pressure comprising a valve guide passage within the sidewall of said throttle body and opening into said conduit at a location immediately above said valve element when the latter is in the idleposition, a vent duct communicating with said atmospheric pressure, a port connecting said guide passage and vent duct, the sidewall of said throttle body defining said guide passage also defining a valve seat around said port, Vent valve means shiftable within said guide passage for seating at said valve seat to close said port and block communication between said induction conduit and atmospheric pressure,
- an inlet manifold structure defining an inlet passage for conducting a fuel-air mixture to said engine and supporting the base of said throttle body seated thereon with the portion of the induction conduit in said throttle body aligned with said inlet passage, said vent duct being defined by both said manifold structure and throttle body and comprising a groove in the base of said throttle body confronting said manifold structure and extending from said port to the exterior of said throttle body.
- said guide passage opening into said induction conduit at a slot in the sidewall of said conduit immediately above said throttle valve element at said idle position, and said interengaging means including a portion extending through said slot for shifting said vent valve means from said valve seat to open said port to atmosphere upon closing of said throttle valve element to said idle position.
- said guide passage opening into said induction conduit through a slot in the sidewall of said conduit immediately above said throttle valve element at said idle position, and said interengaging means comprising means extending through said slot.
- valve guide passage extending vertically within the sidewall of said throttle body, said vent valve means being vertically shiftable within said guide passage and being normally urged by gravity force to close said port.
- said interengaging means comprising a portion operably connected with said throttle valve element for movement therewith and engageable with a portion of said vent valve means to open the latter upon said closing of said throttle valve element to said idle position, at least one of said portions extending through said s-lot upon said closing of said throttle valve element to said idle position.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US545389A US3353801A (en) | 1966-04-26 | 1966-04-26 | Hot start venting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US545389A US3353801A (en) | 1966-04-26 | 1966-04-26 | Hot start venting |
Publications (1)
Publication Number | Publication Date |
---|---|
US3353801A true US3353801A (en) | 1967-11-21 |
Family
ID=24176016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US545389A Expired - Lifetime US3353801A (en) | 1966-04-26 | 1966-04-26 | Hot start venting |
Country Status (1)
Country | Link |
---|---|
US (1) | US3353801A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4094292A (en) * | 1976-02-25 | 1978-06-13 | Honda Giken Kogyo Kabushiki Kaisha | Hot starter system for engines |
US6431527B1 (en) * | 1999-11-15 | 2002-08-13 | Walbro Corporation | Rotary throttle valve carburetor |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2690331A (en) * | 1951-10-18 | 1954-09-28 | Gen Motors Corp | Carburetor throttle body vent |
US2962014A (en) * | 1957-08-05 | 1960-11-29 | Acf Ind Inc | Automatic choke control |
US2988345A (en) * | 1959-02-26 | 1961-06-13 | Gen Motors Corp | Air valve carburetor |
US2995351A (en) * | 1959-11-27 | 1961-08-08 | Acf Ind Inc | Carburetor |
US2996051A (en) * | 1960-01-13 | 1961-08-15 | Gen Motors Corp | Carburetor |
US3254638A (en) * | 1962-08-27 | 1966-06-07 | Walker | Carburetor idle fuel control |
-
1966
- 1966-04-26 US US545389A patent/US3353801A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2690331A (en) * | 1951-10-18 | 1954-09-28 | Gen Motors Corp | Carburetor throttle body vent |
US2962014A (en) * | 1957-08-05 | 1960-11-29 | Acf Ind Inc | Automatic choke control |
US2988345A (en) * | 1959-02-26 | 1961-06-13 | Gen Motors Corp | Air valve carburetor |
US2995351A (en) * | 1959-11-27 | 1961-08-08 | Acf Ind Inc | Carburetor |
US2996051A (en) * | 1960-01-13 | 1961-08-15 | Gen Motors Corp | Carburetor |
US3254638A (en) * | 1962-08-27 | 1966-06-07 | Walker | Carburetor idle fuel control |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4094292A (en) * | 1976-02-25 | 1978-06-13 | Honda Giken Kogyo Kabushiki Kaisha | Hot starter system for engines |
US6431527B1 (en) * | 1999-11-15 | 2002-08-13 | Walbro Corporation | Rotary throttle valve carburetor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIDELITY UNION TRUST COMPANY, 765 BROAD ST., NEWAR Free format text: MORTGAGE;ASSIGNOR:CHRYSLER CORPORATION;REEL/FRAME:003832/0358 Effective date: 19810209 Owner name: FIDELITY UNION TRUST COMPANY, TRUSTEE,NEW JERSEY Free format text: MORTGAGE;ASSIGNOR:CHRYSLER CORPORATION;REEL/FRAME:003832/0358 Effective date: 19810209 |
|
AS | Assignment |
Owner name: CHRYSLER CORPORATION, HIGHLAND PARK, MI 12000 LYNN Free format text: ASSIGNORS HEREBY REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID INVENTIONS AND RELEASE THEIR SECURITY INTEREST.;ASSIGNORS:FIDELITY UNION BANK;ARNEBECK, WILLIAM, INDIVIDUAL TRUSTEE;REEL/FRAME:004063/0604 Effective date: 19820217 |
|
AS | Assignment |
Owner name: CHRYSLER CORPORATION Free format text: PARTES REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID PATENTS ALSO RELEASE THEIR SECURITY INTEREST.;ASSIGNOR:MANUFACTURERS NATIONAL BANK OF DETROIL (CORPORATE TRUSTEE) AND BLACK DONALD E., (INDIVIDUAL TRUSTEE);REEL/FRAME:004355/0154 Effective date: 19840905 |