US2742380A - Starting system for two-cycle gas engines - Google Patents

Starting system for two-cycle gas engines Download PDF

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US2742380A
US2742380A US452819A US45281954A US2742380A US 2742380 A US2742380 A US 2742380A US 452819 A US452819 A US 452819A US 45281954 A US45281954 A US 45281954A US 2742380 A US2742380 A US 2742380A
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cylinder
crankcase
piston
engine
passage
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US452819A
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Byron M Peters
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio

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  • a further object of the invention is to provide a device for the purpose which may be readily attached to an engine without having to make any material changes thereto, or it may be incorporated in an engine during the manufacture thereof.
  • Still another object of the invention is to provide a starting system which is designed for ease and economy of manufacture.
  • An additional object of the invention is to provide a practical, reliable, and durable starting system for twocycle gas engines, and one which will be exceedingly effective for the purpose for which it is designed.
  • Fig. 1 is a somewhat diagrammatic sectional elevation of a two-cycle gas engine, showing the start-facilitating system, in the form of an attachment, mounted thereon.
  • Fig. 2 is an enlarged sectional elevation of the valve unit of the system, detached.
  • the engine here illustrated is of a conventional type and comprises a cylinder 1, a crankcase 2, a piston 3 in the cylinder, a crank 4 on the crankshaft 5, and a connecting rod 6 between the piston and crank.
  • An intake passage 7 opens to the crankcase when the piston reaches the top of its stroke, while an exhaust passage 8 opens to the cylinder when the piston is at or adjacent the bottom of its stroke.
  • a bypass passage or conduit 9 opens to the crankcase in any position of the piston and to the cylinder only when the piston is near the bottom of its stroke.
  • a reduced-diameter valve stem 12 projects along the housing from the inner end of the plunger, and terminates in a valve .head 13,;preferably-of the poppet type, adapted to engage a valve seat 14 in the inner end of housing 10.
  • a lateral passage 17 formed with the housing 10 communicates with the interior thereof at a point between the valve seat and the point of innermost movement of the plunger, and is connected to the passage 9 by a tube 18; connection between the tube and passage being'preferably made by a fitting 19 secured in the outer wall of -said passage.
  • valve 13 is opened. This allows the mixture confined in the cylinder upon the upper end of passage 9 being closed by the piston to be bypassed back into the crankcase as the piston continues to rise.
  • the valve is thus opened by pushing in the outer exposed end of the plunger 11. This could be done by actual hand contact, but when the engine is mounted in a relatively hard-to-get-at position on a vehicle, such as that shown in the above identified copending application, the valve is opened by a hand-controlled mechanical device.
  • a hand-controlled mechanical device includes a lever 20 pivoted intermediate its ends, as at 21, in connection with the engine, and disposed so that one end of the lever engages the outer end of the plunger 11.
  • a housed pull-wire 22 is connected to the other end of the lever, which wire may of course extend to any convenient point of operation on the vehicle.
  • a two-cycle gas engine which includes a crankcase, a cylinder, a piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuel mixture from the crankcase to the cylinder only upon the piston reaching a point adjacent the bottom of its stroke; means forming a passage connecting the conduit intermediate its ends and the cylinder adjacent its outer end, and a manually operable normally closed valve in said passage means.
  • a two-cycle gas engine which includes a crankcase, a cylinder, a piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuel mixture from the crankcase to the cylinder only upon the piston reaching apoint adjacent the bottom of its-stroke; means forming a passage connecting the com duit intermediate 1 its ends and the cylinder adjacent its outer end, and a manually opened valve normally closing the end of said passage means at its connection with the cylinder and opening into the same.
  • a two-cycle gas engine which includes a crankcase, acylinder, a piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuelmixture from the crankcase to the cylinder only upon the piston reaching a point adjacent the bottom of its stroke; means forming a passage connecting the conduit intermediate its ends and the cylinder adjacent its outer end, a normally closed valve in said passage means,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

April 17, 1956 INVENTOR BY Ma a/WM UnitedStates Patent A ice 2,742,380 vsran rrncsirsrnrm on rwo cvcnn GAS :nnenvns Byron M. Peters, Lathrop, Calif.
Application Augus't'30, "1954,-'Serial No. 452,819
Claims. (Cl. 123 182) l his invention relates to twocycle gas engines, and particularly to small one-cylinder engines of this type which-"because of the added weight, cost, *and other factors- -are not equipped with self-starters.
Such 'Iengin'es take and compress the fuelmixture into the cylinder with each revolution of the crankshaft, and this feature sometimes makes it hard to start the engine, especially when a disadvantageous manually actuated leverage device must be used to turn the engine and against the repeated resistance of compression.
It is therefore the major object of my invention to provide a system to facilitate the starting of a two-cycle gas engine by relieving the compression in the cylinder without dissipating the mixture into the air adjacent the engine, and where the volatile mixture might catch fire.
A further object of the invention is to provide a device for the purpose which may be readily attached to an engine without having to make any material changes thereto, or it may be incorporated in an engine during the manufacture thereof.
It is also an object of the invention to incorporate a twocycle engine, equipped with the novel starting system, in driving relation with a wheel of a tricycle-type, power driven, single-occupant vehicle, in such a manner that the engine is turned over upon advance of the vehicle along the ground by foot-work on the part of the operator, while the start-facilitating system is under the control of a hand of the operator guiding the vehicle.
Still another object of the invention is to provide a starting system which is designed for ease and economy of manufacture.
An additional object of the invention is to provide a practical, reliable, and durable starting system for twocycle gas engines, and one which will be exceedingly effective for the purpose for which it is designed.
These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.
In the drawings:
Fig. 1 is a somewhat diagrammatic sectional elevation of a two-cycle gas engine, showing the start-facilitating system, in the form of an attachment, mounted thereon.
Fig. 2 is an enlarged sectional elevation of the valve unit of the system, detached.
Referring now more particularly to the drawings, and to the characters of reference marked thereon, the engine here illustrated is of a conventional type and comprises a cylinder 1, a crankcase 2, a piston 3 in the cylinder, a crank 4 on the crankshaft 5, and a connecting rod 6 between the piston and crank.
An intake passage 7 opens to the crankcase when the piston reaches the top of its stroke, while an exhaust passage 8 opens to the cylinder when the piston is at or adjacent the bottom of its stroke.
A bypass passage or conduit 9 opens to the crankcase in any position of the piston and to the cylinder only when the piston is near the bottom of its stroke.
2,742,380 Patented Apr. '17, 1956 Secured in, andprojecting from, the cylinder at appoint above the top of the stroke of the piston is an elongated tubular valve housing 10; a plunger 11 having a slidingfit in :theouterend portion of the housing and projecting outwardly therefrom some distance, as shown. t
A reduced-diameter valve stem 12 projects along the housing from the inner end of the plunger, and terminates in a valve .head 13,;preferably-of the poppet type, adapted to engage a valve seat 14 in the inner end of housing 10.
A vcompression spring 15 on the plunger between the outer end of the housing and a stop washer 16 on the plunger, yieldably acts to hold the valve closed and prevents the same from being opened by reason of a tendency to vacuum within the cylinder.
A lateral passage 17 formed with the housing 10 communicates with the interior thereof at a point between the valve seat and the point of innermost movement of the plunger, and is connected to the passage 9 by a tube 18; connection between the tube and passage being'preferably made by a fitting 19 secured in the outer wall of -said passage.
In operation, as the piston 3 rises to the top of its stroke, a tendency to vacuum is set up in the crankcase, causing a flow of mixture from the intake passage 7 into the crankcase 2, and which mixture transfers into the cylinder as soon as the piston uncovers the upper end of the passage 9. Then, as the piston again rises, the transferred mixture is further compressed, setting up a resistance to a turning-over of the engine, particularly when a disadvantageous leverage must be employed to start the engine, as is the case when the engine is mounted to operate a vehicle such as that shown in my copending application for patent, Serial No. 453,005, filed August 30, 1954.
To relieve this compression, so that the engine turns over more readily, the valve 13 is opened. This allows the mixture confined in the cylinder upon the upper end of passage 9 being closed by the piston to be bypassed back into the crankcase as the piston continues to rise.
The valve is thus opened by pushing in the outer exposed end of the plunger 11. This could be done by actual hand contact, but when the engine is mounted in a relatively hard-to-get-at position on a vehicle, such as that shown in the above identified copending application, the valve is opened by a hand-controlled mechanical device. Such a device includes a lever 20 pivoted intermediate its ends, as at 21, in connection with the engine, and disposed so that one end of the lever engages the outer end of the plunger 11. A housed pull-wire 22 is connected to the other end of the lever, which wire may of course extend to any convenient point of operation on the vehicle.
From the foregoing description it will be readily seen that there has been produced such a system as will substantially fulfill the objects of the invention, as set forth herein.
While this specification sets forth in detail the present and preferred construction of the system, still in practice such deviations therefrom may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.
Having thus described the invention, the following is claimed as new and useful, and upon which Letters Patent are desired:
1. In a two-cycle gas engine which includes a crankcase, a cylinder, a piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuel mixture from the crankcase to the cylinder only upon the piston reaching a point adjacent the bottom of its stroke; means forming a passage connecting the conduit intermediate its ends and the cylinder adjacent its outer end, and a manually operable normally closed valve in said passage means.
2. In a two-cycle gas engine which includes a crankcase, a cylinder, a piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuel mixture from the crankcase to the cylinder only upon the piston reaching apoint adjacent the bottom of its-stroke; means forming a passage connecting the com duit intermediate 1 its ends and the cylinder adjacent its outer end, and a manually opened valve normally closing the end of said passage means at its connection with the cylinder and opening into the same.
3. In a two-cycle gas engine which includes a crankcase, acylinder, a piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuelmixture from the crankcase to the cylinder only upon the piston reaching a point adjacent the bottom of its stroke; means forming a passage connecting the conduit intermediate its ends and the cylinder adjacent its outer end, a normally closed valve in said passage means,
and means to open the valve from a point relatively remote tothe engine.
4. Ina two-cycle gas engine which includes a crankcase, a cylinder, 8. piston reciprocable in the cylinder, and a conduit between the crankcase and cylinder arranged to transfer fuel mixture from the crankcase to the cylinder References Cited in the file of this patent HEDSTAI AT 1,192,515 Gibson July 25, 1916 1,290,276 Merkel Jan. 7, 1919 1,607,173 Saives Nov. 16, 1926 1,623,589 Granath Apr. 5, 1927 1,746,533 Johnson Feb. 11, 1930 2,137,482 Gil Nov. 22, 1938 2,625,924 Friedlob Jan. 20, 1953 2,648,321
Slonneger Aug. 11, 1953

Claims (1)

1. IN A TWO-CYCLE GAS ENGINE WHICH INCLUDES A CRANKCASE, A CYLINDER, A PISTON RECIPROCABLE IN THE CYLINDER, AND A CONDUIT BETWEEN THE CRANKCASE AND CYLINDER ARRANGED TO TRANSFER FUEL MIXTURE FROM THE CRANKCASE TO THE CYLINDER ONLY UPON THE PISTON REACHING A POINT ADJACENT THE BOTTOM OF ITS STROKE; MEANS FORMING A PASSAGE CONNECTING THE CONDUIT INTERMEDIATE ITS END AND THE CYLINDER ADJACENT ITS OUTER END, AND AMANUALLY OPERABLE NORMALLY CLOSED VALVE IN SAID PASSAGE MEANS.
US452819A 1954-08-30 1954-08-30 Starting system for two-cycle gas engines Expired - Lifetime US2742380A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270719A (en) * 1961-07-25 1966-09-06 Yanmar Diesel Engine Co Pressure reducing device for diesel type rotary engines
US3418992A (en) * 1967-07-19 1968-12-31 Textron Inc Decompression control for internal combustion engine
US3638632A (en) * 1970-05-06 1972-02-01 James Willard Boling Motorcycle compression release
US3807689A (en) * 1973-02-02 1974-04-30 Power Parts Co Lever actuated cylinder head test valve
US3919991A (en) * 1974-01-07 1975-11-18 Mcculloch Corp Automatic decompression device
US4204384A (en) * 1976-07-14 1980-05-27 Outboard Marine Corporation Lawn mower including means for stopping engine
US4252092A (en) * 1979-09-04 1981-02-24 Tecumseh Products Company Compression release mechanism
US4386587A (en) * 1981-12-21 1983-06-07 Ford Motor Company Two stroke cycle engine with increased efficiency
US4619228A (en) * 1984-10-11 1986-10-28 Textron Inc. Automatic compression release for two-cycle engine
US5211140A (en) * 1991-05-28 1993-05-18 Kioritz Corporation Decompressor for internal combustion engine
US5361738A (en) * 1992-05-18 1994-11-08 Kioritz Corporation Decompression device for an engine
US5377642A (en) * 1993-07-19 1995-01-03 Textron Inc. Compression release for an internal combustion engine
EP0692628A1 (en) 1994-07-12 1996-01-17 Deere & Company Control system for power tool with internal combustion engine
EP0692627A1 (en) 1994-07-12 1996-01-17 Deere & Company Over-travel actuation system
US5630385A (en) * 1994-11-21 1997-05-20 Kioritz Corporation Internal combustion engine with decompression device
US6000370A (en) * 1997-11-20 1999-12-14 Ryobi North America, Inc. Compression release mechanism for an internal combustion engine
US6016776A (en) * 1995-04-07 2000-01-25 Aktiebolaget Electrolux Cylinder
US20040094110A1 (en) * 2002-11-15 2004-05-20 Wolf Burger Automatic decopmression device for valve-controlled internal combustion engines
US20040134455A1 (en) * 2002-09-24 2004-07-15 Norbert Korenjak Automatic mechanical decompressor for an internal combustion engine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1192515A (en) * 1915-12-24 1916-07-25 Auto Ped Company Of America Self-propelled vehicle.
US1290776A (en) * 1917-12-06 1919-01-07 Henry A Oberbeck Hearse attachment for automobiles.
US1607173A (en) * 1923-10-02 1926-11-16 Renault Louis Internal-combustion engine
US1623589A (en) * 1926-03-05 1927-04-05 Joseph D Granath Internal-combustion engine
US1746533A (en) * 1928-07-05 1930-02-11 Johnson Brothers Engineering C Method and apparatus for relieving compression in outboard motors for starting
US2137482A (en) * 1937-03-09 1938-11-22 Joseph V Gil Means for facilitating starting of internal combustion engines
US2625924A (en) * 1949-06-03 1953-01-20 Fred M Friedlob Combined compression relief and carburetor control for internal-combustion engines
US2643321A (en) * 1951-07-28 1953-06-23 Norman M Greene Manually operated solder feeder for electric soldering irons

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1192515A (en) * 1915-12-24 1916-07-25 Auto Ped Company Of America Self-propelled vehicle.
US1290776A (en) * 1917-12-06 1919-01-07 Henry A Oberbeck Hearse attachment for automobiles.
US1607173A (en) * 1923-10-02 1926-11-16 Renault Louis Internal-combustion engine
US1623589A (en) * 1926-03-05 1927-04-05 Joseph D Granath Internal-combustion engine
US1746533A (en) * 1928-07-05 1930-02-11 Johnson Brothers Engineering C Method and apparatus for relieving compression in outboard motors for starting
US2137482A (en) * 1937-03-09 1938-11-22 Joseph V Gil Means for facilitating starting of internal combustion engines
US2625924A (en) * 1949-06-03 1953-01-20 Fred M Friedlob Combined compression relief and carburetor control for internal-combustion engines
US2643321A (en) * 1951-07-28 1953-06-23 Norman M Greene Manually operated solder feeder for electric soldering irons

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3270719A (en) * 1961-07-25 1966-09-06 Yanmar Diesel Engine Co Pressure reducing device for diesel type rotary engines
US3418992A (en) * 1967-07-19 1968-12-31 Textron Inc Decompression control for internal combustion engine
US3638632A (en) * 1970-05-06 1972-02-01 James Willard Boling Motorcycle compression release
US3807689A (en) * 1973-02-02 1974-04-30 Power Parts Co Lever actuated cylinder head test valve
US3919991A (en) * 1974-01-07 1975-11-18 Mcculloch Corp Automatic decompression device
US4204384A (en) * 1976-07-14 1980-05-27 Outboard Marine Corporation Lawn mower including means for stopping engine
US4252092A (en) * 1979-09-04 1981-02-24 Tecumseh Products Company Compression release mechanism
US4386587A (en) * 1981-12-21 1983-06-07 Ford Motor Company Two stroke cycle engine with increased efficiency
US4619228A (en) * 1984-10-11 1986-10-28 Textron Inc. Automatic compression release for two-cycle engine
US5211140A (en) * 1991-05-28 1993-05-18 Kioritz Corporation Decompressor for internal combustion engine
US5361738A (en) * 1992-05-18 1994-11-08 Kioritz Corporation Decompression device for an engine
US5377642A (en) * 1993-07-19 1995-01-03 Textron Inc. Compression release for an internal combustion engine
EP0692628A1 (en) 1994-07-12 1996-01-17 Deere & Company Control system for power tool with internal combustion engine
EP0692627A1 (en) 1994-07-12 1996-01-17 Deere & Company Over-travel actuation system
US5492096A (en) * 1994-07-12 1996-02-20 Homelite, Inc. Over-travel actuation system
US5551395A (en) * 1994-07-12 1996-09-03 Homelite, Inc. Control system for power tool with internal combustion engine
AU693874B2 (en) * 1994-07-12 1998-07-09 Deere & Company Over-travel actuation system
US5630385A (en) * 1994-11-21 1997-05-20 Kioritz Corporation Internal combustion engine with decompression device
US6016776A (en) * 1995-04-07 2000-01-25 Aktiebolaget Electrolux Cylinder
US6000370A (en) * 1997-11-20 1999-12-14 Ryobi North America, Inc. Compression release mechanism for an internal combustion engine
US20040134455A1 (en) * 2002-09-24 2004-07-15 Norbert Korenjak Automatic mechanical decompressor for an internal combustion engine
US6892688B2 (en) * 2002-09-24 2005-05-17 Brp-Rotax Gmbh & Co. Kg Automatic mechanical decompressor for an internal combustion engine
US20040094110A1 (en) * 2002-11-15 2004-05-20 Wolf Burger Automatic decopmression device for valve-controlled internal combustion engines
US6837203B2 (en) 2002-11-15 2005-01-04 Mtd Products Inc Automatic decompression device for valve-controlled internal combustion engines

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