US2706972A - Crankcase valve for two-cycle engine - Google Patents

Crankcase valve for two-cycle engine Download PDF

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US2706972A
US2706972A US20313850A US2706972A US 2706972 A US2706972 A US 2706972A US 20313850 A US20313850 A US 20313850A US 2706972 A US2706972 A US 2706972A
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ports
reeds
crankcase
crank
fuel mixture
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Elmer C Kiekhaefer
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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
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
    • F01L3/205—Reed valves
    • 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
    • F02B75/007—Other engines having vertical crankshafts
    • 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
    • F02B75/20—Multi-cylinder engines with cylinders all in one line
    • 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
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • 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
    • F02B2075/1804—Number of cylinders
    • F02B2075/1808—Number of cylinders two
    • 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
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7838—Plural
    • Y10T137/7839—Dividing and recombining in a single flow path

Definitions

  • This invention relates to crankcase induction valve means for two-cycle, internal-combustion engines, and particularly two-cylinder, alternate-firing engines.
  • the invention provides a crankcase induction reed valve unit which admits and directs the fuel mixture into bearing in each crank chamber.
  • a principal object of the invention is to provide a reed valve unit which will operate more eiciently to admit greater fuel charges into the crank chamber.
  • a more particular object is to predetermine the flexing action of the reeds of the valve unit and eliminate backing plates to limit the opening movement of the reeds.
  • Another object is to provide an efficient arrangement of the reeds with respect to the limited dimensions of the crank chamber of an engine.
  • Figure 1 is a cross-sectional view of a two-cycle, alternate-firing, two cylinder engine employing crankcase precompression with one piston removed to show the intake ports and with the reed valve center bearing block shown in Figs. 2 to 5;
  • Fig. 4 is a view taken on line 4 4 of Fig. l through the members of the bearing block;
  • Fig. 5 is a section of one of the reeds taken on line 5 5 of Fig. 3.
  • crankshaft 3 The engine shown in the drawings comprises the cylinder block 1 and crankcase member 2
  • Each of the two cylinder bores 6 opening into crankcase 5 carries a piston 7 connected by a rod 8 to the corresponding upper and lower crank throws 9 and 10, respectively, of crankshaft 3.
  • Crank throws 9 and 10 are spaced 180 with respect to the crankshaft axis so that the pistons reciprocate in opposite directions for alternate firing or with each 180 of crankshaft rotation.
  • Crankcase 5 is divided into the separate upper and lower crank chambers 11 and 12 by the bearing block 13.
  • the fuel mixture is opens through ports 15 into the respective cylinder bore xhaust gases are discharged through opposite 2,706,972 Patented Apr. 26, 1955 power stroke.
  • complementary, semi-circular bearing members 17 comprising block 13 are joined by bolts 18 passing therethrough on each side of a central axial bore 19.
  • Bore 19 is adapted to t and receive the center journal 20 of crankshaft 3 between crank throws 9 and 10 for the journal support of the crankshaft.
  • the outer dimension of members 17 iit the corresponding machined inner surface of crankcase 5 to divide the latter as referred to above.
  • the induction manifold jointl through opening is selectively admitted to chambers the ports 24.
  • Ports 24 are arranged in block 13 open from the upper and lower faces ports are spaced in a circle dimension of the block.
  • the series of holes 25 are drilled and tapped in the marginal body of the block providing at least one hole 25 adjacent to a port.
  • the reeds 26 normally seated on the upper and lower faces of the block to cover ports 24, control the admission of fuel mixture to .the respective chambers.
  • Each reed 26 comprises a exible, thin, spring-steel port normally to close the same as described.
  • the flexing of the reeds must be restricted to within the elastic limits of the metal and the stresses should be distributed evenly throughout the length of the reed.
  • the reed should taper from a wider secured port and striking the underside of the reed.
  • the port may having a main journal, a crankcase for said crankshaft, a circular journal bearing member assembled on said journal and forming one end wall of said crankcasc, a fuel supply passage in said bearing member opening through a series of ports formed therein, said ports being spaced circumferentially about said journal, and a series of flexible reeds secured to said bearing member adjacent the periphery thereof and normally extending radially of said journal and seated on said member to close the respective ports, each of said reeds being of substantially uniform thickness and tapering in width from the wider secured end to the narrower free end whereby each reed is subject to more uniform flexure through its free length.
  • crankcase valve for two-cycle engines and the like comprising a circular valve block forming one end of an induction passage and a series of ports opening from the face of said block, a series of flexible reeds secured at their outer ends against the face of said block and extending radially inwardly and normally seated over said ports to close the latter, said reeds being of a generally uniform thickness and of a width diminishing from the secured ends thereof whereby the movement of the reedsl by the gas acting thereagainst to open said ports is substantially limited to a uniform angular deflection and the reed is accordingly more uniformly stressed 3.
  • crankshaft crank a crank chamber therefor having an end CII - wardly toward 5.
  • a crankshaft a crank case for said crankshaft, a bearing member including bearing means journally supporting said crankshaft between crank-throws and dividing said crank case into individual crank chambers adapted to receive a fuel mixture for precompression, said member having a passage and a series of ports arranged about said bearing means for the admission of the fuel mixture to said chambers during the induction cycle of the respective chamber, and a series of reeds secured to said member and disposed to control the admission of fuel mixture through said ports and when open to direct the fuel mixture radially inwardly toward the respective crank-throw whereby the fuel mixture is given a rotational velocity upon entering the chamber tending to increase the induction cycle of said engine.
  • an internal-combustion engine a crankshaft, a crank case for said crankshaft, a bearing member including bearing means journally supporting said crankshaft between crank-throws and dividing said crankcase into individual crank chambers adapted to receive a fuel mixture for precompression, said member having a passage and a series of ports arranged about said bearing means for the admission of the fuel mixture to said chambers during the induction cycle of the respective chamber, and a series of reeds secured to said member and disposed to control the admission of fuel mixture through said ports and when open to direct the fuel mixture radially inthe respective crank-throw whereby the fuel mixture is given a rotational velocity upon entering the chamber tending to increase induction cycle of said engine, said reeds being of a generally uniform thickness and of a width diminishing from the secured ends thereof whereby the movement of the reeds by the gas acting thereagainst to open said ports is substantially limited to a uniform angular deection and the reed is accordingly more uniformly

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Description

April 26, 1955 E. c. KIEKHAEFER 2,706,972
CRANKCASE VALVE FOR Two-CYCLE ENGINE Filed Dec. 28, 1950 4 -I Ir l p .fz-1f l.. fh
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|l 2Q l I /2 L f@ Il. j/f I ""T`" l l f2 2 fz yff /7 [4 j Z4 y "4 ",lllllllfm 1f' Il 5 "Milam 2% lauu United States Patent O 2,706,972 CRANKCASE VALVE FOR TWO-CYCLE ENGINE Elmer C. Kiekhaefer, Cedarburg, Wis. Application December 28, 1950, Serial No. 203,138 6 Claims. (Cl. 123-73) This invention relates to crankcase induction valve means for two-cycle, internal-combustion engines, and particularly two-cylinder, alternate-firing engines.
The invention provides a crankcase induction reed valve unit which admits and directs the fuel mixture into bearing in each crank chamber.
A principal object of the invention is to provide a reed valve unit which will operate more eiciently to admit greater fuel charges into the crank chamber.
A more particular object is to predetermine the flexing action of the reeds of the valve unit and eliminate backing plates to limit the opening movement of the reeds.
Another object is to provide an efficient arrangement of the reeds with respect to the limited dimensions of the crank chamber of an engine.
These and other panying drawings.
In the drawings:
Figure 1 is a cross-sectional view of a two-cycle, alternate-firing, two cylinder engine employing crankcase precompression with one piston removed to show the intake ports and with the reed valve center bearing block shown in Figs. 2 to 5;
showing the reed sections therefor as arranged on one face of the block, and with one reed broken away and sectioned;
Fig. 4 is a view taken on line 4 4 of Fig. l through the members of the bearing block; and
Fig. 5 is a section of one of the reeds taken on line 5 5 of Fig. 3.
The engine shown in the drawings comprises the cylinder block 1 and crankcase member 2 Each of the two cylinder bores 6 opening into crankcase 5 carries a piston 7 connected by a rod 8 to the corresponding upper and lower crank throws 9 and 10, respectively, of crankshaft 3. Crank throws 9 and 10 are spaced 180 with respect to the crankshaft axis so that the pistons reciprocate in opposite directions for alternate firing or with each 180 of crankshaft rotation.
Crankcase 5 is divided into the separate upper and lower crank chambers 11 and 12 by the bearing block 13.
In the operation of the engine, the fuel mixture is opens through ports 15 into the respective cylinder bore xhaust gases are discharged through opposite 2,706,972 Patented Apr. 26, 1955 power stroke. complementary, semi-circular bearing members 17 comprising block 13 are joined by bolts 18 passing therethrough on each side of a central axial bore 19. Bore 19 is adapted to t and receive the center journal 20 of crankshaft 3 between crank throws 9 and 10 for the journal support of the crankshaft. The outer dimension of members 17 iit the corresponding machined inner surface of crankcase 5 to divide the latter as referred to above.
The induction manifold jointl through opening is selectively admitted to chambers the ports 24.
Ports 24 are arranged in block 13 open from the upper and lower faces ports are spaced in a circle dimension of the block. The series of holes 25 are drilled and tapped in the marginal body of the block providing at least one hole 25 adjacent to a port.
The reeds 26 normally seated on the upper and lower faces of the block to cover ports 24, control the admission of fuel mixture to .the respective chambers.
pressure within passages 21 to lift the reeds from the block to open the p Each reed 26 comprisesa exible, thin, spring-steel port normally to close the same as described.
For maximum service, the flexing of the reeds must be restricted to within the elastic limits of the metal and the stresses should be distributed evenly throughout the length of the reed.
In the operation of the engine the reeds controlling accordingly require supporting means on the back side llexing uniformly along the length of the reed.
Acco sion of rding to the tion for even distribution of the stress.
Generally, the reed should taper from a wider secured port and striking the underside of the reed. Generally, however, the port may having a main journal, a crankcase for said crankshaft, a circular journal bearing member assembled on said journal and forming one end wall of said crankcasc, a fuel supply passage in said bearing member opening through a series of ports formed therein, said ports being spaced circumferentially about said journal, and a series of flexible reeds secured to said bearing member adjacent the periphery thereof and normally extending radially of said journal and seated on said member to close the respective ports, each of said reeds being of substantially uniform thickness and tapering in width from the wider secured end to the narrower free end whereby each reed is subject to more uniform flexure through its free length.
2. In a crankcase valve for two-cycle engines and the like comprising a circular valve block forming one end of an induction passage and a series of ports opening from the face of said block, a series of flexible reeds secured at their outer ends against the face of said block and extending radially inwardly and normally seated over said ports to close the latter, said reeds being of a generally uniform thickness and of a width diminishing from the secured ends thereof whereby the movement of the reedsl by the gas acting thereagainst to open said ports is substantially limited to a uniform angular deflection and the reed is accordingly more uniformly stressed 3. In an internal-combustion engine, a having a main journal, for said crankshaft having a circular inner wall, a circular journal bearing member assembled on said journal and forming o ne end wall of said crankcase, a'fuel supply passage in said bearing member opening through a series of ports formed therein, said ports being spaced circumferentially about said journal, and a series of exible reeds secured to said bearing member adjacent the periphery thereof and normally extending radially of said journal and seated on said member to close the respective ports, each of said reeds being of substantially uniform thickness and tapering in width from the outer wider secured end to the inner narrower free end whereby each reed is subject to more uniform ilexure through its free length and abutting at the outer end thereof the inner wall of said crankcase so as to be located with respect thereto.
4. In an internal-combustion engine, having a wall axially spaced from said crank and including bearing means journally supporting said crankshaft, a series of ports in said wall arranged about said bearing means for the admission of a fuel mixture to said chamber during the induction cycle of said engine, and a series of reeds secured to said wall and disposed to control the admission of fuel mixture through said ports and when open to direct the fuel mixture radially inwardly toward said crank whereby the fuel mixture is given a rotational velocity upon entering said chamber tending to increase the induction cycle of said engine.
a crankshaft crank, a crank chamber therefor having an end CII - wardly toward 5. In an internal-combustion engine, a crankshaft, a crank case for said crankshaft, a bearing member including bearing means journally supporting said crankshaft between crank-throws and dividing said crank case into individual crank chambers adapted to receive a fuel mixture for precompression, said member having a passage and a series of ports arranged about said bearing means for the admission of the fuel mixture to said chambers during the induction cycle of the respective chamber, and a series of reeds secured to said member and disposed to control the admission of fuel mixture through said ports and when open to direct the fuel mixture radially inwardly toward the respective crank-throw whereby the fuel mixture is given a rotational velocity upon entering the chamber tending to increase the induction cycle of said engine.
6. 1n an internal-combustion engine, a crankshaft, a crank case for said crankshaft, a bearing member including bearing means journally supporting said crankshaft between crank-throws and dividing said crankcase into individual crank chambers adapted to receive a fuel mixture for precompression, said member having a passage and a series of ports arranged about said bearing means for the admission of the fuel mixture to said chambers during the induction cycle of the respective chamber, and a series of reeds secured to said member and disposed to control the admission of fuel mixture through said ports and when open to direct the fuel mixture radially inthe respective crank-throw whereby the fuel mixture is given a rotational velocity upon entering the chamber tending to increase induction cycle of said engine, said reeds being of a generally uniform thickness and of a width diminishing from the secured ends thereof whereby the movement of the reeds by the gas acting thereagainst to open said ports is substantially limited to a uniform angular deection and the reed is accordingly more uniformly stressed throughout its free length.
References Cited in the le of this patent UNITED STATES PATENTS 202,725 Heister Apr. 23, 1878 1,213,519 McLaren Ian. 23, 1917 1,407,585 Setz Feb. 21, 1922 1,632,385 Vollman June 14, 1927 1,634,949 Le Valley July 5, 1927 2459,594 Smith Ian. 18, 1949 2 609,660 Tenney Sept. 9, 1952 2 632,621 Gamble Mar. 24, 1953 FOREIGN PATENTS 26,783 Great Britain Nov. 18, 1909 254,704 Great Britain May 19, 1927 456,430 France June 18, 1913
US20313850 1950-12-28 1950-12-28 Crankcase valve for two-cycle engine Expired - Lifetime US2706972A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973752A (en) * 1958-11-29 1961-03-07 Innocenti Soc Generale Two-stroke internal combustion engine
US3099998A (en) * 1960-04-11 1963-08-06 Am Dyne Trust Fluid rectifier
US3192913A (en) * 1964-04-13 1965-07-06 Ohlsson & Rice Inc Valve apparatus for internal combustion engines
US3541657A (en) * 1968-07-03 1970-11-24 Brunswick Corp Method of producing a reed valve block
US3554172A (en) * 1969-10-01 1971-01-12 Brunswick Corp Reed block crankcase induction for two-cycle engine
FR2467288A1 (en) * 1979-10-08 1981-04-17 Quiniou Herve Two-stroke IC engine - has charge transfer from crankcase controlled by rotary valve driven from crankshaft
FR2519076A1 (en) * 1981-12-28 1983-07-01 Brunswick Corp INTAKE SYSTEM FOR A TWO-STROKE INTERNAL COMBUSTION ENGINE
US4964380A (en) * 1989-05-24 1990-10-23 Brunswick Corporation Induction system for a two-cycle engine
US9562494B2 (en) 2013-01-31 2017-02-07 Brp-Powertrain Gmbh & Co. Kg Internal combustion engine having a split crankcase

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US202725A (en) * 1878-04-23 Improvement in double-acting pumps
GB190926783A (en) * 1909-11-18 1910-09-29 William Walker Fyfe Improvements in Valves.
FR456430A (en) * 1912-05-06 1913-08-26 Ignaz Feichtinger Exhaust regulator device, more particularly applicable to locomotives
US1213519A (en) * 1915-06-26 1917-01-23 Chester Mclaren Two-cycle rotary-cylinder internal-combustion engine.
US1407585A (en) * 1920-07-26 1922-02-21 Hans R Setz Two-cycle internal-combustion engine
GB254704A (en) * 1925-07-02 1927-05-19 Atlas Diesel Ab Improvements in or relating to automatically operating scavenging valves for two-stroke cycle internal combustion engines applicable also to compressors and the like
US1632385A (en) * 1922-02-15 1927-06-14 Carl W Vollmann Compressor
US1634949A (en) * 1925-07-23 1927-07-05 Ingersoll Rand Co Air-compressor valve
US2459294A (en) * 1946-02-25 1949-01-18 Evertite Roof Corp Shingle dipping machine
US2609660A (en) * 1946-02-25 1952-09-09 Tenney Resonating pulse jet engine
US2632621A (en) * 1950-09-23 1953-03-24 Vilbiss Co Valve mechanism

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US202725A (en) * 1878-04-23 Improvement in double-acting pumps
GB190926783A (en) * 1909-11-18 1910-09-29 William Walker Fyfe Improvements in Valves.
FR456430A (en) * 1912-05-06 1913-08-26 Ignaz Feichtinger Exhaust regulator device, more particularly applicable to locomotives
US1213519A (en) * 1915-06-26 1917-01-23 Chester Mclaren Two-cycle rotary-cylinder internal-combustion engine.
US1407585A (en) * 1920-07-26 1922-02-21 Hans R Setz Two-cycle internal-combustion engine
US1632385A (en) * 1922-02-15 1927-06-14 Carl W Vollmann Compressor
GB254704A (en) * 1925-07-02 1927-05-19 Atlas Diesel Ab Improvements in or relating to automatically operating scavenging valves for two-stroke cycle internal combustion engines applicable also to compressors and the like
US1634949A (en) * 1925-07-23 1927-07-05 Ingersoll Rand Co Air-compressor valve
US2459294A (en) * 1946-02-25 1949-01-18 Evertite Roof Corp Shingle dipping machine
US2609660A (en) * 1946-02-25 1952-09-09 Tenney Resonating pulse jet engine
US2632621A (en) * 1950-09-23 1953-03-24 Vilbiss Co Valve mechanism

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973752A (en) * 1958-11-29 1961-03-07 Innocenti Soc Generale Two-stroke internal combustion engine
US3099998A (en) * 1960-04-11 1963-08-06 Am Dyne Trust Fluid rectifier
US3192913A (en) * 1964-04-13 1965-07-06 Ohlsson & Rice Inc Valve apparatus for internal combustion engines
US3541657A (en) * 1968-07-03 1970-11-24 Brunswick Corp Method of producing a reed valve block
US3554172A (en) * 1969-10-01 1971-01-12 Brunswick Corp Reed block crankcase induction for two-cycle engine
FR2467288A1 (en) * 1979-10-08 1981-04-17 Quiniou Herve Two-stroke IC engine - has charge transfer from crankcase controlled by rotary valve driven from crankshaft
FR2519076A1 (en) * 1981-12-28 1983-07-01 Brunswick Corp INTAKE SYSTEM FOR A TWO-STROKE INTERNAL COMBUSTION ENGINE
US4408579A (en) * 1981-12-28 1983-10-11 Brunswick Corporation Induction system for a two-cycle engine
US4964380A (en) * 1989-05-24 1990-10-23 Brunswick Corporation Induction system for a two-cycle engine
US9562494B2 (en) 2013-01-31 2017-02-07 Brp-Powertrain Gmbh & Co. Kg Internal combustion engine having a split crankcase

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