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EP1304449A1 - Internal combustion engine with rotary valves - Google Patents

Internal combustion engine with rotary valves Download PDF

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Publication number
EP1304449A1
EP1304449A1 EP02006371A EP02006371A EP1304449A1 EP 1304449 A1 EP1304449 A1 EP 1304449A1 EP 02006371 A EP02006371 A EP 02006371A EP 02006371 A EP02006371 A EP 02006371A EP 1304449 A1 EP1304449 A1 EP 1304449A1
Authority
EP
European Patent Office
Prior art keywords
engine
rotary valves
internal combustion
ports
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.)
Granted
Application number
EP02006371A
Other languages
German (de)
French (fr)
Other versions
EP1304449B1 (en
Inventor
Hans Ruysschaert
Peter Ruysschaert
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.)
Re-Invest- Suisse GmbH
Original Assignee
Re-Invest- Suisse GmbH
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 claimed from EP01124825A external-priority patent/EP1304448A1/en
Application filed by Re-Invest- Suisse GmbH filed Critical Re-Invest- Suisse GmbH
Priority to EP20020006371 priority Critical patent/EP1304449B1/en
Publication of EP1304449A1 publication Critical patent/EP1304449A1/en
Application granted granted Critical
Publication of EP1304449B1 publication Critical patent/EP1304449B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L1/02—Valve drive
    • F01L1/022—Chain drive
    • 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
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/08—Rotary or oscillatory slide valve-gear or valve arrangements with conically or frusto-conically shaped valves
    • 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
    • F01L1/02—Valve drive
    • F01L1/024—Belt drive
    • 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
    • F01L1/02—Valve drive
    • F01L1/026—Gear drive

Definitions

  • US 2 245 743 discloses a rotary valve assembly for internal combustion engines with a head of a valve member mounted to rotate about its axis in a coacting conical surface of the head whilst its stem is carried by two roller bearings.
  • Major drawbacks result from the valves being exposed with their frontal surface to the combustion chamber and thus being exposed to heavy pressure and thermal loads.
  • Another drawback is to be seen in the conical surface of the valve that serves as passageway and as slide bearing without clearly separating these two functions.
  • the present invention is aiming at internal combustion engines with rotary valves overcoming the above mentionned disadvantages while offering advantages for the construction and the efficiency of the engine.
  • the present invention proposes internal combustion engines with rotary valves with the features of claim 1.
  • Preferred embodiments of the present invention are outlined in the subclaims.
  • an internal combustion engine with rotary valves in axial bores to control opening and closing of transfer ports in a cylinder head or cylinder block for fluid communication between the ports and a combustion chamber of the engine, and a valve drive shaft arranged perpendicular to the rotary valves, the shaft being provided with helical gaps to cooperate with gears fixed to the free ends of the rotary valves for driving the rotary valves in accordance with the operating cycle of the engine with each rotary valve being provided with a passage duct in the valve head opening into the ports.
  • the respective axial bores of the cylinder head or cylinder block are formed as a casing around the rotary valves such that the rotary valves are only exposed via the ports to the combustion chamber of the engine.
  • the rotary valves With the axial bores in the cylinder head or cylinder block providing a casing the rotary valves are protected from the alternating high pressure pics and the thermal load from the operating combustion chamber.
  • the rotary valves being shielded from the combustion cycles of the engine is providing for smooth operation and improved endurance of the rotary valves, the drive of the rotary valves and the entire engine.
  • the internal combustion engine with rotary valves according to the present invention is less consumptive while emitting less exhaust gases and presenting a higher perfomance due to the continuous and constant supplie of fuel mixture.
  • the rotary valves according to the present invention may be implemented onto an existing engine with a cylinder head replacing conventional oscillating valves after changes in the cylinder head, i. e. replacing the conventional cam shaft(s) with the valve drive shaft arranged perpendicular to the rotary valves and altering the cylinder head to accomodate the rotary valves.
  • the respective axial bores are accessible for the rotary valves from the side of the cylinder head or cylinder block remote from the combustion chamber of the engine.
  • the respective axial bores being milled into the cylinder head or cylinder block remote from the side of the combustion chamber a better shielding and an improved mounting procedure for valve assemblies can be achieved.
  • valve drive shaft is driven by the crankshaft of the engine or by a separat electro motor allowing better electronic control.
  • the cylinder block is an integral unit comprising intake and exhaust channels, comprising the bores for the rotary valves and comprising the side walls till the casing of the crankshaft of the engine.
  • a cylinder head sealing is obsolete with this new concept of an internal combustion engine with rotary valves.
  • each rotary valve is being held in position in the cylinder head or cylinder block by a ball bearing remote from the ports and conically shaped slide bearings above and below the ports.
  • each rotary valve is provided with spring means abutting against the ball bearing and the conically shaped valve head in the bores.
  • the spring is biasing the rotary valve into the conically shaped valve seat in the cylinder head or cylinder block thus providing for improved sealing at reduced length of the stem of the rotary valve allowing thus reduced height of the cylinder head or cylinder block and thus less encumbrance for the entire new internal combustion engine with rotary valves.
  • the spring is abutting against the central member of the ball bearing rotating with the rotary valve and is thus free from sheer forces.
  • each rotary valve is provided with a central passage duct in the conically shaped valve head opening into the ports in accordance with the operating cycles of the engine.
  • FIG. 1, 2 An internal combustion engine 1 has rotary valves 2, 3 in axial bores 4, 5. Transfer ports, i. e. an intake port 6 and an exhaust port 7 in a cylinder block 8 allow fluid, i. e. fuel mixture, to communicate between the ports 6, 7 and a combustion chamber 23 of the engine 1.
  • a piston 14 is connected to a crankshaft 21 via a rod 22.
  • the cylinder block 8. is an integral unit or is equipped with a cylinder head gasket (not shown), according to the engine manufacturers wishes, comprising the intake and exhaust ports 6, 7, comprising the bores 4, 5 for the rotary valves 2, 3 and comprising the side walls 20, 15 till the casing of the crankshaft 21 of the engine 1.
  • Each axial bore 4, 5 consists of a first section with a cylindrical shaped body 27 and a second section 24 with a bevel shaped body occupying the transfer ports 6, 7.
  • the axial bores 4, 5 are drilled into the cylinder block or cylinder head 8 from the side remote to the combustion chamber 23 of the engine 1.
  • the axial bores 4, 5 are entirely embedded in the cylinder block or cylinder head 8 apart from the surface accesssed by the ports 6,7.
  • Each rotary valve 2, 3 is being held in position in the axial bores 4, 5 of the cylinder block 8 by a circumferential member of a ball bearing 16 remote from the ports 6, 7.
  • Conical shaped slide bearings 17, 18 are arranged above and below the ports 6, 7.
  • a helical spring 19 is abutting against the central member of the ball bearing 16.
  • Helical spring 19 is biasing the conically shaped valve head 13 into the second section 24 of the bores 4, 5.
  • the respective axis of rotation 25, 26 of the rotary valves 2, 3 are perpendicular to each other.
  • a valve drive shaft 9 is arranged perpendicular to the rotary valves 2, 3.
  • the shaft 9 is provided with helical slots 10 around its entire surface to cooperate with gear wheels 11 fixed to the respective free ends of the rotary valves 2, 3.
  • Each rotary valve has a central passage duct 12 in the valve head 13.
  • the valve drive shaft 9 is driven by the crankshaft of the. engine or by a separat electro motor (not shown).
  • Fig. 3 Each gear wheel 11 is fixed by a screw 27 to a threaded free end of the rotary valves 2, 3.
  • a ball bearing 16 is mounted with its central member to a stem 28 of each rotary valve 2, 3.
  • Each rotary valve has a central passage duct 12 in the bevelled valve head 13.
  • Step 1 During the intake stroke the rotary valve 2 in intake port 6 is rotated by the helical slots 10 of valve drive shaft 9 in an angular position to open intake port 6 via its central passage duct 12. Exhaust port 7 remains closed by rotary valve 3.
  • Step 2 During the compression stroke the rotary valves 2, 3 in transfer ports 6, 7 are rotated by the helical slots 10 of valve drive shaft 9 in angular positions to close intake port 6 and exhaust port 7.
  • Step 3 During the ignition and expansion stroke the rotary valves 2, 3 in transfer ports 6, 7 are rotated by the helical slots 10 of valve drive shaft 9 in angular positions to keep closed intake port 6 and exhaust port 7.
  • Step 4 During the exhaustion stroke the rotary valves 2, 3 in transfer ports 6, 7 are rotated by the helical slots 10 of valve drive shaft 9 in angular positions to keep closed the intake port 6 but to open exhaust port 7 via the central passage duct 12 of rotary valve 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The invention is directed to an Internal combustion engine (1) with rotary valves (2, 3) in axial bores (4, 5) to control opening and closing of transfer ports (6, 7) in a cylinder head or cylinder block (8) for fluid communication between the ports (6, 7) and a combustion chamber (23) of the engine (1). A valve drive shaft (9) is arranged perpendicular to the rotary valves (2, 3), the shaft (9) being provided with helical slots (10) to cooperate with gears (11) fixed to the free ends of the rotary valves (2, 3) for driving the rotary valves (2, 3) in accordance with the operating cycle of the engine (1).

Description

  • Internal combustion engines with rotary valves have been known since 1910 with the conception of the Burt McCollum engine. There has been influence on this concept from Minerva, Panhard and Levassor and Mercedes producing this combustion engine - patented by Knight - till 1939. Due to sealing problems the concept of the Burt McCollum engine had to be abandoned. Conventional cylinder heads with oscillating valves have the well known disadvantages of offering restricted performance and discontinuous supply of fuel-mixture. Major drawbacks result from the valves, the ignition and. the sealings, that need constant surveillance and maintenance with the involved costs.
  • US 2 245 743 discloses a rotary valve assembly for internal combustion engines with a head of a valve member mounted to rotate about its axis in a coacting conical surface of the head whilst its stem is carried by two roller bearings. Major drawbacks result from the valves being exposed with their frontal surface to the combustion chamber and thus being exposed to heavy pressure and thermal loads. Another drawback is to be seen in the conical surface of the valve that serves as passageway and as slide bearing without clearly separating these two functions.
  • The present invention is aiming at internal combustion engines with rotary valves overcoming the above mentionned disadvantages while offering advantages for the construction and the efficiency of the engine.
  • The present invention proposes internal combustion engines with rotary valves with the features of claim 1. Preferred embodiments of the present invention are outlined in the subclaims.
  • According to the present invention is provided an internal combustion engine with rotary valves in axial bores to control opening and closing of transfer ports in a cylinder head or cylinder block for fluid communication between the ports and a combustion chamber of the engine, and a valve drive shaft arranged perpendicular to the rotary valves, the shaft being provided with helical gaps to cooperate with gears fixed to the free ends of the rotary valves for driving the rotary valves in accordance with the operating cycle of the engine with each rotary valve being provided with a passage duct in the valve head opening into the ports. The respective axial bores of the cylinder head or cylinder block are formed as a casing around the rotary valves such that the rotary valves are only exposed via the ports to the combustion chamber of the engine. With the axial bores in the cylinder head or cylinder block providing a casing the rotary valves are protected from the alternating high pressure pics and the thermal load from the operating combustion chamber. The rotary valves being shielded from the combustion cycles of the engine is providing for smooth operation and improved endurance of the rotary valves, the drive of the rotary valves and the entire engine. The internal combustion engine with rotary valves according to the present invention is less consumptive while emitting less exhaust gases and presenting a higher perfomance due to the continuous and constant supplie of fuel mixture. The rotary valves according to the present invention may be implemented onto an existing engine with a cylinder head replacing conventional oscillating valves after changes in the cylinder head, i. e. replacing the conventional cam shaft(s) with the valve drive shaft arranged perpendicular to the rotary valves and altering the cylinder head to accomodate the rotary valves.
  • According to a preferred embodiment of the present invention the respective axial bores are accessible for the rotary valves from the side of the cylinder head or cylinder block remote from the combustion chamber of the engine. With the respective axial bores being milled into the cylinder head or cylinder block remote from the side of the combustion chamber a better shielding and an improved mounting procedure for valve assemblies can be achieved.
  • According to a preferred embodiment of the present invention the valve drive shaft is driven by the crankshaft of the engine or by a separat electro motor allowing better electronic control.
  • According to another preferred embodiment of the present invention the cylinder block is an integral unit comprising intake and exhaust channels, comprising the bores for the rotary valves and comprising the side walls till the casing of the crankshaft of the engine. A cylinder head sealing is obsolete with this new concept of an internal combustion engine with rotary valves.
  • According to another preferred embodiment of the present invention each rotary valve is being held in position in the cylinder head or cylinder block by a ball bearing remote from the ports and conically shaped slide bearings above and below the ports. With the inventive arrangement of bearings there is substantially no leakage around the rotary valve, being smoothly spinning at low resistance levels.
  • According to another preferred embodiment of the present invention each rotary valve is provided with spring means abutting against the ball bearing and the conically shaped valve head in the bores. The spring is biasing the rotary valve into the conically shaped valve seat in the cylinder head or cylinder block thus providing for improved sealing at reduced length of the stem of the rotary valve allowing thus reduced height of the cylinder head or cylinder block and thus less encumbrance for the entire new internal combustion engine with rotary valves. The spring is abutting against the central member of the ball bearing rotating with the rotary valve and is thus free from sheer forces.
  • According to another preferred embodiment of the present invention each rotary valve is provided with a central passage duct in the conically shaped valve head opening into the ports in accordance with the operating cycles of the engine.
  • Additional features of the invention will become apparent and a fuller understanding obtained by reading the following detailed description made in connection with the accompanying drawings.
    • Fig. 1
    shows a transversal section through an internal combustion engine with rotary valves according to the present invention,
    Fig. 2
    shows a schematic perspective view of a possible configuration of a rotary valve and a valve drive shaft for engine manufacturers according to the present invention, and
    Fig. 3
    shows a rotary valve according to the present invention.
  • Fig. 1, 2: An internal combustion engine 1 has rotary valves 2, 3 in axial bores 4, 5. Transfer ports, i. e. an intake port 6 and an exhaust port 7 in a cylinder block 8 allow fluid, i. e. fuel mixture, to communicate between the ports 6, 7 and a combustion chamber 23 of the engine 1. A piston 14 is connected to a crankshaft 21 via a rod 22.
  • The cylinder block 8. is an integral unit or is equipped with a cylinder head gasket (not shown), according to the engine manufacturers wishes, comprising the intake and exhaust ports 6, 7, comprising the bores 4, 5 for the rotary valves 2, 3 and comprising the side walls 20, 15 till the casing of the crankshaft 21 of the engine 1.
  • Each axial bore 4, 5 consists of a first section with a cylindrical shaped body 27 and a second section 24 with a bevel shaped body occupying the transfer ports 6, 7. The axial bores 4, 5 are drilled into the cylinder block or cylinder head 8 from the side remote to the combustion chamber 23 of the engine 1. The axial bores 4, 5 are entirely embedded in the cylinder block or cylinder head 8 apart from the surface accesssed by the ports 6,7.
  • Each rotary valve 2, 3 is being held in position in the axial bores 4, 5 of the cylinder block 8 by a circumferential member of a ball bearing 16 remote from the ports 6, 7. Conical shaped slide bearings 17, 18 are arranged above and below the ports 6, 7. A helical spring 19 is abutting against the central member of the ball bearing 16. Helical spring 19 is biasing the conically shaped valve head 13 into the second section 24 of the bores 4, 5.
  • The respective axis of rotation 25, 26 of the rotary valves 2, 3 are perpendicular to each other.
  • A valve drive shaft 9 is arranged perpendicular to the rotary valves 2, 3. The shaft 9 is provided with helical slots 10 around its entire surface to cooperate with gear wheels 11 fixed to the respective free ends of the rotary valves 2, 3. Each rotary valve has a central passage duct 12 in the valve head 13.
  • The valve drive shaft 9 is driven by the crankshaft of the. engine or by a separat electro motor (not shown).
  • Fig. 3: Each gear wheel 11 is fixed by a screw 27 to a threaded free end of the rotary valves 2, 3. A ball bearing 16 is mounted with its central member to a stem 28 of each rotary valve 2, 3. Each rotary valve has a central passage duct 12 in the bevelled valve head 13.
  • Operation of the internal combustion engine 1 with rotary valves 2, 3
  • In the following the rotary valves will be described in the context of their use with reciprocating type internal combustion engines. However neither some of the known nor the rotary valve embodiments in accordance with the present invention are limited to such applications.
  • Step 1: During the intake stroke the rotary valve 2 in intake port 6 is rotated by the helical slots 10 of valve drive shaft 9 in an angular position to open intake port 6 via its central passage duct 12. Exhaust port 7 remains closed by rotary valve 3.
  • Step 2: During the compression stroke the rotary valves 2, 3 in transfer ports 6, 7 are rotated by the helical slots 10 of valve drive shaft 9 in angular positions to close intake port 6 and exhaust port 7.
  • Step 3: During the ignition and expansion stroke the rotary valves 2, 3 in transfer ports 6, 7 are rotated by the helical slots 10 of valve drive shaft 9 in angular positions to keep closed intake port 6 and exhaust port 7.
  • Step 4: During the exhaustion stroke the rotary valves 2, 3 in transfer ports 6, 7 are rotated by the helical slots 10 of valve drive shaft 9 in angular positions to keep closed the intake port 6 but to open exhaust port 7 via the central passage duct 12 of rotary valve 3.
  • With the next stroke the operating cycle starts again with step 1.

Claims (8)

  1. Internal combustion engine (1) with
    rotary valves (2, 3) in axial bores (4, 5) to control opening and closing of transfer ports (6, 7) in a cylinder head or cylinder block (8) for fluid communication between the ports (6, 7) and a combustion chamber (23) of the engine (1), and
    a valve drive shaft (9) arranged perpendicular to the rotary valves (2, 3), the shaft (9) being provided with helical slots (10) to cooperate with gears (11) fixed to the free ends of the rotary valves (2, 3) for driving the rotary valves (2, 3) in accordance with the operating cycle of the engine (1) characterized in that the
    respective axial bores (4, 5) of the cylinder head or cylinder block (8) are formed as a casing around the rotary valves (2, 3) such that the rotary valves (2, 3) are only exposed via the ports (6, 7) to the combustion chamber (23) of the engine (1).
  2. Internal combustion engine (1) according to claim 1, characterized in that the respective axial bores (4, 5) are accessible for the rotary valves (2, 3) from the side of the cylinder head or cylinder block (8) remote from the combustion chamber (23) of the engine (1).
  3. Internal combustion engine (1) according to claim 1, characterized in that the valve drive shaft (9) is driven by the crankshaft (21) of the engine (1).
  4. Internal combustion engine (1) according to claim 1, characterized in that the valve drive shaft (9) is driven by an electro motor or by timing-belt, chain or gear.
  5. Internal combustion engine (1) according to claim 1, characterized in that the cylinder block (8) is an integral unit comprising intake and exhaust ports (6, 7), comprising the bores (4, 5) for the rotary valves (2, 3) and comprising the side walls (20, 15) till the casing of the crankshaft of the engine (1).
  6. Internal combustion engine (1) according to claim 1, characterized in that each rotary valve (2, 3) being held in position in the cylinder head or cylinder block (8) by a ball bearing (16) remote from the ports (6, 7) and conically shaped slide bearings (17, 18) above and below the ports (6, 7).
  7. Internal combustion engine (1) according to claim 1, characterized in that each rotary valve (2, 3) is provided with resilient means (19) abutting against the ball bearing (16) and the conically shaped valve head (13) in the bores (4, 5).
  8. Internal combustion engine (1) according to claim 1, characterized in that each rotary valve (2, 3) is provided with a central passage duct (12) in the conically shaped valve head opening in the ports (6, 7).
EP20020006371 2001-10-18 2002-03-21 Internal combustion engine with rotary valves Expired - Lifetime EP1304449B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20020006371 EP1304449B1 (en) 2001-10-18 2002-03-21 Internal combustion engine with rotary valves

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01124825A EP1304448A1 (en) 2001-10-18 2001-10-18 Internal combustion engine with rotary valves
EP01124825 2001-10-18
EP20020006371 EP1304449B1 (en) 2001-10-18 2002-03-21 Internal combustion engine with rotary valves

Publications (2)

Publication Number Publication Date
EP1304449A1 true EP1304449A1 (en) 2003-04-23
EP1304449B1 EP1304449B1 (en) 2004-12-01

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ID=26076742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020006371 Expired - Lifetime EP1304449B1 (en) 2001-10-18 2002-03-21 Internal combustion engine with rotary valves

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EP (1) EP1304449B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013006552B4 (en) 2013-04-09 2015-03-05 Ziyavdin Achmerzaev Rotary valve assembly
DE202013003564U1 (en) 2013-04-09 2013-04-29 Ziyavdin Achmerzaev Rotary valve assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB396641A (en) * 1932-02-27 1933-08-10 Henri Albaret Improvements in or relating to rotary valves for internal combustion engines
FR774366A (en) * 1934-06-08 1934-12-05 Internal combustion engine with rotary conical distributor
GB511208A (en) * 1938-03-01 1939-08-15 Aspin Frank Metcalfe Improvements in or relating to rotary valves for internal combustion engines
US2245743A (en) * 1935-07-23 1941-06-17 Aspin Frank Metcalf Rotary valve
US3362391A (en) * 1965-10-22 1968-01-09 Maurice E. Lindsay Engine overhead valve gear
US5329897A (en) * 1993-06-01 1994-07-19 Renaissance Motor Works Co. Rotary valve with seal for internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB396641A (en) * 1932-02-27 1933-08-10 Henri Albaret Improvements in or relating to rotary valves for internal combustion engines
FR774366A (en) * 1934-06-08 1934-12-05 Internal combustion engine with rotary conical distributor
US2245743A (en) * 1935-07-23 1941-06-17 Aspin Frank Metcalf Rotary valve
GB511208A (en) * 1938-03-01 1939-08-15 Aspin Frank Metcalfe Improvements in or relating to rotary valves for internal combustion engines
US3362391A (en) * 1965-10-22 1968-01-09 Maurice E. Lindsay Engine overhead valve gear
US5329897A (en) * 1993-06-01 1994-07-19 Renaissance Motor Works Co. Rotary valve with seal for internal combustion engine

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