GB2576915A - A rotary valve internal combustion engine - Google Patents

A rotary valve internal combustion engine Download PDF

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Publication number
GB2576915A
GB2576915A GB1814530.0A GB201814530A GB2576915A GB 2576915 A GB2576915 A GB 2576915A GB 201814530 A GB201814530 A GB 201814530A GB 2576915 A GB2576915 A GB 2576915A
Authority
GB
United Kingdom
Prior art keywords
rotary valve
volume
valve
internal combustion
tuning pipe
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Withdrawn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
GB1814530.0A
Other versions
GB201814530D0 (en
Inventor
Lawes Keith
Mason Brian
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.)
RCV Engines Ltd
Original Assignee
RCV Engines Ltd
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 RCV Engines Ltd filed Critical RCV Engines Ltd
Priority to GB1814530.0A priority Critical patent/GB2576915A/en
Publication of GB201814530D0 publication Critical patent/GB201814530D0/en
Priority to TW108101975A priority patent/TWI816740B/en
Priority to JP2021512237A priority patent/JP7479612B2/en
Priority to PCT/EP2019/073559 priority patent/WO2020049032A1/en
Priority to AU2019333865A priority patent/AU2019333865A1/en
Priority to GB1912714.1A priority patent/GB2577398A/en
Priority to BR112021004246-6A priority patent/BR112021004246A2/en
Priority to CN201980059398.7A priority patent/CN112703301B/en
Priority to US17/272,800 priority patent/US11377983B2/en
Priority to EP19772652.4A priority patent/EP3847347B1/en
Publication of GB2576915A publication Critical patent/GB2576915A/en
Priority to CONC2021/0002958A priority patent/CO2021002958A2/en
Priority to PH12021550465A priority patent/PH12021550465A1/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Withdrawn legal-status Critical Current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
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/02—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves
    • F01L7/021—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves with one rotary valve
    • F01L7/023—Cylindrical valves having a hollow or partly hollow body allowing axial inlet or exhaust fluid circulation
    • 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
    • F01L7/02—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves
    • F01L7/028—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves having the rotational axis coaxial with the cylinder axis and the valve surface not surrounding piston or cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10039—Intake ducts situated partly within or on the plenum chamber housing
    • 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
    • F01L2250/00—Camshaft drives characterised by their transmission means
    • F01L2250/06—Camshaft drives characterised by their transmission means the camshaft being driven by gear wheels

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

A rotary valve internal combustion engine comprising: and a rotary valve (5, fig.1) rotatable in the valve housing, the rotary valve having a hollow valve body forming a part of the combustion chamber (4, fig.1), wherein the interior volume of the hollow valve body is subjected to combustion gases throughout the combustion process, and further having in a wall part a port (21, fig.1) giving, during rotation of the valve, fluid communication successively to and from inlet and exhaust ports in the valve housing (8, fig.1), wherein the engine has an airbox or filter housing containing a curved tuning pipe 35 leading from the air inlet 36 of the engine into a filtered air volume part 32 of the airbox. The tuning pipe 35 also preferably passing through the unfiltered air volume part of the airbox. The arrangement maximizes the length of the tuning pipe without increasing the overall size of the engine.

Description

(54) Title of the Invention: A rotary valve internal combustion engine Abstract Title: A rotary valve internal combustion engine and airbox arrangement (57) A rotary valve internal combustion engine comprising: and a rotary valve (5, fig. 1) rotatable in the valve housing, the rotary valve having a hollow valve body forming a part of the combustion chamber (4, fig.1), wherein the interior volume of the hollow valve body is subjected to combustion gases throughout the combustion process, and further having in a wall part a port (21, fig. 1) giving, during rotation of the valve, fluid communication successively to and from inlet and exhaust ports in the valve housing (8, fig. 1), wherein the engine has an airbox or filter housing containing a curved tuning pipe 35 leading from the air inlet 36 of the engine into a filtered air volume part 32 of the airbox. The tuning pipe 35 also preferably passing through the unfiltered air volume part of the airbox. The arrangement maximizes the length of the tuning pipe without increasing the overall size of the engine.
At least one drawing originally filed was informal and the print reproduced here is taken from a later filed formal copy.
12 19
i4 37 31
A rotary valve internal combustion engine
The present invention relates to a rotary valve internal combustion engine in which the control of the intake and exhaust gases of combustion is achieved by means of a rotary valve.
A rotary valve internal combustion engine comprising: a piston connected to a crankshaft and reciprocatable in a cylinder, the cylinder having a combustion end, a combustion chamber being defined in part by the piston and the combustion end of the cylinder, a valve housing fixed at an outer portion of the combustion end of the cylinder and defining a bore and a rotary valve rotatable about a rotary valve axis in the bore in the valve housing, the rotary valve having a hollow valve body having an interior volume forming a part of the combustion chamber, wherein the interior volume of the hollow valve body is subjected to combustion gases throughout the combustion process, and further having in a wall part thereof a port giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports in the valve housing.
The present invention seeks to provide improvements in such an engine.
According to the present invention there is provided a rotary valve internal combustion engine comprising: a piston connected to a crankshaft and reciprocatable in a cylinder, the cylinder having a combustion end, a combustion chamber being defined in part by the piston and the combustion end of the cylinder, a valve housing fixed at an outer portion of the combustion end of the cylinder and defining a bore and a rotary valve rotatable about a rotary valve axis in the bore in the valve housing, the rotary valve having a hollow valve body having an interior volume forming a part of the combustion chamber, wherein the interior volume of the hollow valve body is subjected to combustion gases throughout the combustion process, and further having in a wall part thereof a port giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports in the valve housing, wherein the engine has an airbox containing a curved tuning pipe leading from the air inlet of the engine into a filtered air volume part of the airbox.
Preferably, the engine has a carburettor, the tuning pipe being secured to the air inlet of the carburettor.
In a preferred embodiment, the airbox is divided into an unfiltered volume and filtered volume by a dividing wall, the dividing wall containing a filter through which air passes from the unfiltered volume to the filtered volume, the tuning pipe air inlet being located in the filtered volume.
In a further preferred form, the tuning pipe passes from the carburettor through the unfiltered volume and through the dividing wall into the filtered volume. The tuning pipe may pass through the filter in the dividing wall.
A preferred embodiment of the present invention will now be described by way of example with reference to the accompanying drawings, in which:Figure 1 shows a cross-sectional view of a single cylinder air cooled spark ignition rotary valve internal combustion engine, and
Figure 2 shows a part-sectional side view of an embodiment of the engine showing an inlet tract
Referring now to Figure 1, there is shown a single cylinder air cooled engine. The engine has a cylinder housing containing the cylinder 2. A piston 1 is connected in the conventional manner to a crankshaft 3 mounted for rotation in a crankcase 14 for reciprocation in the cylinder 2. The upper part of the cylinder 2 is closed by a combustion chamber 4 in a combustion chamber housing. The combustion chamber housing has an inlet port 27 for the flow of inlet air/fuel mix into the combustion chamber and an exhaust port (not shown)for venting the exhaust gas into and out of the combustion chamber 4, the gas flows being controlled by a rotary valve 5. In this embodiment, the valve 5 is rotatable in a valve housing 8 in the combustion chamber housing about an axis 5a which is co-axial with the axis of the cylinder 2. In other embodiments, the axis of rotation of the valve body is offset from the axis 5a of the cylinder 2.
At its end remote from the combustion chamber 4, the rotary valve 5 has a concentric drive shaft 6 carrying a single race ball bearing 7 which rotatably supports the valve 5 in the valve housing 8. The valve driveshaft 6 is secured to a coaxial driven gear 9 which meshes with a drive gear 10 of a drive arrangement 11 through which the driven gear 9 and hence the rotary valve 5 is connected to the crankshaft 3. The drive arrangement 11 includes a drive shaft 12 which is located in a channel or tube 17 in the cylinder housing and mounted for rotation in an upper bearing 18 adjacent the drive gear 10 and a lower bearing 13 adjacent the crankshaft
3. The driveshaft 11 carries a bevel gear 15 which meshes with a corresponding bevel gear 16 secured on the crankshaft for rotation with the crankshaft 3. Thus, the rotation of the crankshaft 3 and hence the piston movement is coordinated with the rotation of the rotary valve 5 so that the engine operates on the conventional four stroke cycle. To achieve this, the diameter of the driven gear 9 is twice that of the drive gear 10 so that the rotary valve 5 rotates at half engine speed. The rotary valve 5 comprises a generally cylindrical rotary valve body 5 rotatable about a rotary valve axis 5a with a close sliding fit in the bore in the valve housing 8, the rotary valve 5 having a hollow valve body having an interior volume 18 forming a part of the combustion chamber. The valve has a generally cylindrical body part comprising the valve body 19 itself which is slightly larger in diameter than the shaft 6, which forms a shoulder 14 against which the inner race of the ball bearing 7 is located. The valve body 19 extends into the combustion chamber and has in its interior a volume 18 which forms part of the combustion chamber 4 and which is subject to combustion gases at all stages of the combustion process.
The rotary valve body 19 has a port 21 which, during rotation of the valve, enables fluid communication successively to and from the interior volume of the valve and hence the combustion chamber via the inlet and exhaust ports in the valve housing. In this embodiment the port 21 is in the form of a recess formed in the lower peripheral edge 22 of the wall 23 of the valve body adjacent to the combustion chamber 4 the recess extending upwardly from this lower edge of the wall of the valve to form the port 21 in the side of the valve
Ignition is provided by a spark plug 24 secured into a plug bore 25 formed in the valve housing 8 and extending into the valve bore.
Referring now to Figure 2, there is shown a sectional view of part of the engine of Figure 1 illustrating the air/fuel inlet tract. Part of the outer casing 29 of the engine comprises an air box 30, also known as a plenum chamber, which is divided by a wall 33 into an unfiltered air volume into which ambient air enters through inlet passages 31, and a filtered air volume 32.
The dividing wall 33 contains a filter 34 through which air from the unfiltered side passes into the filtered air side volume 32. The inlet tract has a tuning pipe 35 secured to the carburettor. The tuning pipe 35 leads from the air inlet 36 of the carburettor 28 through a curved path passing through the unfiltered volume in the airbox, through the dividing wall and into the filtered air volume 32. In one form, the tuning pipe 35 passes through the filter itself. The inlet 37 to the tuning pipe 35 is located in the filtered volume 32 and is flared outwardly to improve the flow of air into the tuning pipe 35 and hence into the engine. The curved path maximises the length of the tuning pipe which increases the efficiency of the engine without causing a significant change to the overall size of the engine.
Although shown as a simple curve, it will be appreciated that the tuning pipe may have a more complex shape and may follow a serpentine path.

Claims (6)

1. A rotary valve internal combustion engine comprising: a piston connected to a crankshaft and reciprocatable in a cylinder, the cylinder having a combustion end, a combustion chamber being defined in part by the piston and the combustion end of the cylinder, a valve housing fixed at an outer portion of the combustion end of the cylinder and defining a bore and a rotary valve rotatable about a rotary valve axis in the bore in the valve housing, the rotary valve having a hollow valve body having an interior volume forming a part of the combustion chamber, wherein the interior volume of the hollow valve body is subjected to combustion gases throughout the combustion process, and further having in a wall part thereof a port giving, during rotation of the valve, fluid communication successively to and from the combustion chamber via inlet and exhaust ports in the valve housing, wherein the engine has an airbox containing a curved tuning pipe leading from the air inlet of the engine into a filtered air volume part of the airbox.
2. A rotary valve internal combustion engine according to claim 1 , wherein the engine has a carburettor, the tuning pipe being secured to the air inlet of the carburettor.
3. A rotary valve internal combustion engine according to claim 1 or 2, wherein the airbox is divided into an unfiltered volume and filtered volume by a dividing wall, the dividing wall containing a filter through which air passes from the unfiltered volume to the filtered volume, the tuning pipe air inlet being located in the filtered volume.
4. A rotary valve internal combustion engine according to claim 3, wherein the tuning pipe passes from the carburettor through the unfiltered volume and through the dividing wall into the filtered volume.
5. A rotary valve internal combustion engine according to claim 4, wherein the tuning pipe passes through the filter in the dividing wall.
6. A rotary valve internal combustion engine according to claim 4, wherein the tuning pipe has a serpentine profile along its length.
Intellectual
Property
Office
Application No: GB1814530.0
Examiner:
Mr Gareth Bond
GB1814530.0A 2018-09-06 2018-09-06 A rotary valve internal combustion engine Withdrawn GB2576915A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
GB1814530.0A GB2576915A (en) 2018-09-06 2018-09-06 A rotary valve internal combustion engine
TW108101975A TWI816740B (en) 2018-09-06 2019-01-18 A rotary valve internal combustion engine
EP19772652.4A EP3847347B1 (en) 2018-09-06 2019-09-04 A rotary valve internal combustion engine
BR112021004246-6A BR112021004246A2 (en) 2018-09-06 2019-09-04 internal combustion engine with rotary valve
PCT/EP2019/073559 WO2020049032A1 (en) 2018-09-06 2019-09-04 A rotary valve internal combustion engine
AU2019333865A AU2019333865A1 (en) 2018-09-06 2019-09-04 A rotary valve internal combustion engine
GB1912714.1A GB2577398A (en) 2018-09-06 2019-09-04 A Rotary valve internal combustion engine
JP2021512237A JP7479612B2 (en) 2018-09-06 2019-09-04 Rotary valve internal combustion engine
CN201980059398.7A CN112703301B (en) 2018-09-06 2019-09-04 Rotary valve internal combustion engine
US17/272,800 US11377983B2 (en) 2018-09-06 2019-09-04 Rotary valve internal combustion engine
CONC2021/0002958A CO2021002958A2 (en) 2018-09-06 2021-03-04 An internal combustion engine with rotary valve
PH12021550465A PH12021550465A1 (en) 2018-09-06 2021-03-04 A rotary valve internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1814530.0A GB2576915A (en) 2018-09-06 2018-09-06 A rotary valve internal combustion engine

Publications (2)

Publication Number Publication Date
GB201814530D0 GB201814530D0 (en) 2018-10-24
GB2576915A true GB2576915A (en) 2020-03-11

Family

ID=63921213

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1814530.0A Withdrawn GB2576915A (en) 2018-09-06 2018-09-06 A rotary valve internal combustion engine

Country Status (2)

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GB (1) GB2576915A (en)
TW (1) TWI816740B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754666A (en) * 1980-09-17 1982-04-01 Tokuo Hiraizumi Painting of inorganic painted floor material
JPH0361661A (en) * 1989-07-27 1991-03-18 Honda Motor Co Ltd Air cleaner device of motorcycle
EP0523028A2 (en) * 1991-07-08 1993-01-13 Ab Volvo Device at internal combustion engine with fuel injection
GB2467947A (en) * 2009-02-20 2010-08-25 Rcv Engines Ltd Rotary valve internal combustion engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB246794A (en) * 1925-01-31 1926-08-05 Henri Desmarest A new or improved stencilling apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754666A (en) * 1980-09-17 1982-04-01 Tokuo Hiraizumi Painting of inorganic painted floor material
JPH0361661A (en) * 1989-07-27 1991-03-18 Honda Motor Co Ltd Air cleaner device of motorcycle
EP0523028A2 (en) * 1991-07-08 1993-01-13 Ab Volvo Device at internal combustion engine with fuel injection
GB2467947A (en) * 2009-02-20 2010-08-25 Rcv Engines Ltd Rotary valve internal combustion engine

Also Published As

Publication number Publication date
TW202010929A (en) 2020-03-16
GB201814530D0 (en) 2018-10-24
TWI816740B (en) 2023-10-01

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