FR2364328A1 - Valve operation for four-stroke IC engine - has spring return aided by adiabatic expansion of air compressed during opening stroke - Google Patents

Valve operation for four-stroke IC engine - has spring return aided by adiabatic expansion of air compressed during opening stroke

Info

Publication number
FR2364328A1
FR2364328A1 FR7627150A FR7627150A FR2364328A1 FR 2364328 A1 FR2364328 A1 FR 2364328A1 FR 7627150 A FR7627150 A FR 7627150A FR 7627150 A FR7627150 A FR 7627150A FR 2364328 A1 FR2364328 A1 FR 2364328A1
Authority
FR
France
Prior art keywords
stroke
aided
engine
compressed during
during opening
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.)
Withdrawn
Application number
FR7627150A
Other languages
French (fr)
Inventor
Pierre Jean Beaudoin
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.)
Chrysler France SAS
Original Assignee
Chrysler France SAS
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 Chrysler France SAS filed Critical Chrysler France SAS
Priority to FR7627150A priority Critical patent/FR2364328A1/en
Publication of FR2364328A1 publication Critical patent/FR2364328A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements
    • F01L1/465—Pneumatic arrangements
    • 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
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Abstract

The internal combustion engine valve (1) is operated by the camshaft (2) during the opening stroke and is closed by a pneumatically aided coil spring (14) on its return stroke. Air is trapped in a closed chamber and compressed during opening. The air expands adiabatically during closing. The chamber (4) is in the form of a cup (5) in the cylinder head (6). Its open end has a piston (9) which is keyed (12, 13) to the valve stem (10) this piston also locating the spring. A hole (16) in the side of the chamber wall is uncovered when the valve closes and closed by the piston as the valve opens.
FR7627150A 1976-09-09 1976-09-09 Valve operation for four-stroke IC engine - has spring return aided by adiabatic expansion of air compressed during opening stroke Withdrawn FR2364328A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7627150A FR2364328A1 (en) 1976-09-09 1976-09-09 Valve operation for four-stroke IC engine - has spring return aided by adiabatic expansion of air compressed during opening stroke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7627150A FR2364328A1 (en) 1976-09-09 1976-09-09 Valve operation for four-stroke IC engine - has spring return aided by adiabatic expansion of air compressed during opening stroke

Publications (1)

Publication Number Publication Date
FR2364328A1 true FR2364328A1 (en) 1978-04-07

Family

ID=9177535

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7627150A Withdrawn FR2364328A1 (en) 1976-09-09 1976-09-09 Valve operation for four-stroke IC engine - has spring return aided by adiabatic expansion of air compressed during opening stroke

Country Status (1)

Country Link
FR (1) FR2364328A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949413A1 (en) * 1979-12-08 1981-06-11 Volkswagenwerk Ag, 3180 Wolfsburg IC engine valve resetting force changing device - uses pneumatic springs in addition to coiled valve springs with cam actuation
FR2529616A1 (en) * 1982-06-30 1984-01-06 Renault Sport Pneumatic valve return system for an internal-combustion engine.
US4592313A (en) * 1984-10-15 1986-06-03 Speckhart Frank H Pneumatic valve return
US5203535A (en) * 1991-06-13 1993-04-20 North American Philips Corporation Cam actuated valve assembly with hydraulic spring
US5213072A (en) * 1991-05-28 1993-05-25 Firma Carl Freudenberg Valve actuating mechanism in the cylinder head of a combustion engine
US5233950A (en) * 1991-08-21 1993-08-10 Honda Giken Kogyo Kabushiki Kaisha Valve operating system for internal combustion engine
WO1997009516A1 (en) * 1995-09-01 1997-03-13 Serge Vallve Pneumatic engine valve assembly
DE10357552A1 (en) * 2003-12-10 2005-07-14 Bayerische Motoren Werke Ag Valve drive for an internal combustion engine comprises a housing surrounding a gas-exchange valve shaft and having a radially inward-protruding shoulder at an opening, and a centering element fixed on a valve shaft guide and the shoulder
WO2015160304A1 (en) * 2014-04-17 2015-10-22 Freevalve Ab Combustion engine with pneumatic valve return spring

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949413A1 (en) * 1979-12-08 1981-06-11 Volkswagenwerk Ag, 3180 Wolfsburg IC engine valve resetting force changing device - uses pneumatic springs in addition to coiled valve springs with cam actuation
FR2529616A1 (en) * 1982-06-30 1984-01-06 Renault Sport Pneumatic valve return system for an internal-combustion engine.
US4592313A (en) * 1984-10-15 1986-06-03 Speckhart Frank H Pneumatic valve return
US5213072A (en) * 1991-05-28 1993-05-25 Firma Carl Freudenberg Valve actuating mechanism in the cylinder head of a combustion engine
US5203535A (en) * 1991-06-13 1993-04-20 North American Philips Corporation Cam actuated valve assembly with hydraulic spring
US5233950A (en) * 1991-08-21 1993-08-10 Honda Giken Kogyo Kabushiki Kaisha Valve operating system for internal combustion engine
WO1997009516A1 (en) * 1995-09-01 1997-03-13 Serge Vallve Pneumatic engine valve assembly
DE10357552A1 (en) * 2003-12-10 2005-07-14 Bayerische Motoren Werke Ag Valve drive for an internal combustion engine comprises a housing surrounding a gas-exchange valve shaft and having a radially inward-protruding shoulder at an opening, and a centering element fixed on a valve shaft guide and the shoulder
WO2015160304A1 (en) * 2014-04-17 2015-10-22 Freevalve Ab Combustion engine with pneumatic valve return spring
CN106460592A (en) * 2014-04-17 2017-02-22 弗瑞瓦勒夫股份公司 Combustion engine with pneumatic valve return spring
JP2017514063A (en) * 2014-04-17 2017-06-01 フリーバルブ・アクチボラグ Combustion engine with air valve return spring
US10184361B2 (en) 2014-04-17 2019-01-22 Freevalve Ab Combustion engine with pneumatic valve return spring

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Legal Events

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