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WO1995006804A1 - Piston et biele a course retard pour moteurs - Google Patents

Piston et biele a course retard pour moteurs Download PDF

Info

Publication number
WO1995006804A1
WO1995006804A1 PCT/US1993/008249 US9308249W WO9506804A1 WO 1995006804 A1 WO1995006804 A1 WO 1995006804A1 US 9308249 W US9308249 W US 9308249W WO 9506804 A1 WO9506804 A1 WO 9506804A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
connecting rod
wrist pin
internal combustion
combustion engine
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.)
Ceased
Application number
PCT/US1993/008249
Other languages
English (en)
Inventor
Benjamin V. Booher
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.)
Individual
Original Assignee
Individual
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
Priority to US07/928,880 priority Critical patent/US5239958A/en
Priority claimed from US07/928,880 external-priority patent/US5239958A/en
Application filed by Individual filed Critical Individual
Priority to PCT/US1993/008249 priority patent/WO1995006804A1/fr
Publication of WO1995006804A1 publication Critical patent/WO1995006804A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02—Engines with prolonged expansion
    • F02B41/04—Engines with prolonged expansion in main cylinders
    • 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
    • F02B75/32—Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
    • 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/36—Modified dwell of piston in TDC

Definitions

  • the present invention relates to internal combustion engines and pertains particularly to an improved delay stroke piston assembly for reciprocating piston engines.
  • the reciprocating piston internal combustion engine is manufactured in either two-stroke or four-stroke versions.
  • the four-stroke engine is most widely used in the automobile.
  • recent emphasis ' on economy and fuel efficiency has focused attention on the two stroke engine because of its higher horsepower to weight advantage.
  • the two-stroke engine achieves this advantage because of its higher number of power strokes for a given revolution per minute (rpm) .
  • This advantage is largely outweighed by other disadvantages, primarily in the area of combustion and/or scavenging efficiency.
  • the piston in the four-stroke engine makes four strokes in the cylinder for each power stroke.
  • the piston begins at top dead center (TDC) moving downward with an intake valve open to create a partial vacuum for drawing in a combustion charge.
  • TDC top dead center
  • the piston begins a compression stroke with all valves closed compressing the charge as the piston reaches top dead center.
  • the fuel in the compressed charge is ignited as the piston reaches generally top dead center, and the rapidly burning
  • BDC bottom dead center
  • the present invention is directed to internal combustion engines and pertains particularly to an improved piston and rod assembly.
  • Fig. 1 is an isometric view partially in section illustrating a piston and connecting rod assembly in accordance with a preferred embodiment of the invention
  • Fig. 2 is a a section view of the piston and connecting rod assembly of Fig. 1 shown in the top dead center position;
  • Fig. 3 is a view like Fig. 2 shown near the bottom dead center position.
  • a portion of a reciprocating piston internal combustion engine embodying an exemplary embodiment of a piston and connection rod assembly in accordance with a preferred embodiment of the invention.
  • a portion of an internal combustion engine is designated generally by the numeral 10 and comprises an engine block 12 having a bore in which is mounted a sleeve 14 defining a cylinder.
  • a piston 16 having the usual generally cylindrical outer configuration for fitting within the cylinder 14 and having compression rings 18 and 20, with oil ring assembly 22, is reciprocably mounted within the cylinder 14.
  • the engine has a compression chamber above the piston 16 in which combustion occurs to drive the piston 16 downward for applying a force through the connecting rod to a crank arm of a crank shaft, not shown.
  • the piston 16 is connected to a connecting rod 24 by a compound wrist pin connection, which is designed for establishing a delayed movement of the piston from bottom dead center position to provide increased time for scavenging of exhaust from the cylinder.
  • the present construction can be used in four-stroke engines, but is primarily designed for two cycle engines wherein the exhaust gases may be exhausted by natural flow or by means of a blower. However, for maximum efficiency, it will preferably be scavenged from the cylinder by means of a blower not shown.
  • the crank shaft is connected to the piston by means of a connecting rod having compound wrist pin connection to the piston.
  • the compound wrist pin assembly comprises a first wrist pin 26 journaled in transverse aligned bores 28 in the piston, preferably proximate the center of the length thereof. This wrist pin engages and rides in an angled cam slot 30 at the outermost
  • the cam slot 30 is formed in a cam member 32, which may be formed in the outer end of the connecting rod or formed as a separate piece and secured by suitable means, such as bolts, cap screws or the like 34.
  • the illustrated slot has an upper end 30a and a lower end 30b and is curved with a compound arc between the ends.
  • the slot has a slight slope at the ends and a steep slope intermediate the ends. The effect of the slot cam is to lengthen or shorten the effective length of the connecting rod 24 during each stroke of the piston.
  • a second wrist pin 36 is journaled in a bore 38 adjacent the outer end of the connecting rod 24 and engages a pair of aligned longitudinally extending slots 40 formed in the lower skirt of the piston 16.
  • the longitudinal slot or slots 40 are open at the bottom end and extend substantially parallel to the longitudinal axis of the piston 16.
  • a crankshaft schematically represented, is mounted in the engine block 12 for rotation about a journal 44, and includes a crank arm 46 with journal 48 to which the end of connecting rod 24 is connected.
  • the connecting rod will pivot about the pin 36, forcing the pin 26 to ride upward in the slot 30, forcing the piston to move rapidly upward into the cylinder as the crank shaft reaches top dead center.
  • the upper end of connecting rod 24 will move to the left, allowing the pin to move substantially straight across in slot 30, and the piston to thereby move downward with the upper end of the connecting rod.
  • the pin 26 will be toward the upper end of the slot 30, and will begin the move downward in the slot to the center as the crank reaches bottom.
  • the pin moves toward the lower left hand end of the slot as the crank shaft swings past the bottom dead center, thus allowing the piston to continue moving downward and hesitate at the bottom dead center position as the connecting rod begins to move upward with the crank shaft, as shown in Fig. 3.
  • This provides a delayed movement of the piston or an extended dwell time at the bottom dead center position to extend the scavenging action of the cylinder.
  • This also provides additional time at the bottom dead center position for charging of the cylinder with fresh combustion air or mixture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Un moteur à combustion interne à piston à mouvement alternatif comprend un cylindre (14) ayant des extrémités opposées, un piston (16) monté avec mouvement alternatif dans le cylindre, une bielle (24) ayant une extrémité tourillon du vilebrequin et une extrémité tourillon du piston, la bielle étant reliée au piston au niveau de l'extrémité tourillon au moyen d'un premier maneton (26) et d'un second maneton (36) espacés le long de la bielle, le premier maneton étant tourillonné dans un alésage (28) du piston et dans une fente (30) de la bielle, et le second maneton (36) étant tourillonné dans un alésage (38) de la bielle et dans une fente longitudinale (40) du piston.
PCT/US1993/008249 1992-08-11 1993-08-31 Piston et biele a course retard pour moteurs Ceased WO1995006804A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07/928,880 US5239958A (en) 1992-08-11 1992-08-11 Delay stroke piston and rod for engine
PCT/US1993/008249 WO1995006804A1 (fr) 1992-08-11 1993-08-31 Piston et biele a course retard pour moteurs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/928,880 US5239958A (en) 1992-08-11 1992-08-11 Delay stroke piston and rod for engine
PCT/US1993/008249 WO1995006804A1 (fr) 1992-08-11 1993-08-31 Piston et biele a course retard pour moteurs

Publications (1)

Publication Number Publication Date
WO1995006804A1 true WO1995006804A1 (fr) 1995-03-09

Family

ID=26786994

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/008249 Ceased WO1995006804A1 (fr) 1992-08-11 1993-08-31 Piston et biele a course retard pour moteurs

Country Status (1)

Country Link
WO (1) WO1995006804A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859976A (en) * 1973-07-12 1975-01-14 Edward M Mcwhorter Internal combustion engine - combustion control piston
US4463710A (en) * 1981-12-07 1984-08-07 Mcwhorter Edward M Engine connecting rod and piston assembly
WO1991019087A1 (fr) * 1990-05-30 1991-12-12 Routery Edward E Ensemble bielle-piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859976A (en) * 1973-07-12 1975-01-14 Edward M Mcwhorter Internal combustion engine - combustion control piston
US4463710A (en) * 1981-12-07 1984-08-07 Mcwhorter Edward M Engine connecting rod and piston assembly
WO1991019087A1 (fr) * 1990-05-30 1991-12-12 Routery Edward E Ensemble bielle-piston

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