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
  • 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
  • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
  • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
  • F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
  • F02B25/06—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke the cylinder-head ports being controlled by working pistons, e.g. by sleeve-shaped extensions thereof
• • 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
  • F02B1/00—Engines characterised by fuel-air mixture compression
  • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
  • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

• the present invention relates to an air valve system combined with a distribution chamber serving as their seat. It also relates to a chamber which can be in the casing or in the cylinder or in between. Finally, it relates to an internal combustion engine, in particular of the "two-stroke” type, equipped with a light intake device controlled by a new valve system.
• the invention finds application in the field of explosion engines, and in particular so-called "two-stroke" engines.
• the present invention aims to achieve better filling of the cylinders. It also aims to achieve a filling greater than 1 thanks to a double suction during each cycle.
• the valves are arranged very close to the lights (or openings).
• lights or openings.
• engines "two-stroke" are equipped with modern mounted valve box 'in the housing or casing of the engine.
• valves are of the reed type. They are fixed on a box to facilitate the machining of the seats, the sealing and the assembly. Their opening on one side only is limited by a stop plate.
• valves in the casing means that they are very far from the transfer lights and that they open into a large volume which acts as a buffer and which removes all sensitivity to the valves.
• the passage of gases in the valve box is not very easy either.
• each valve includes a housing for receiving the end of a return spring, said housing being arranged on the face rear of a shutter plate, said plate being shaped and arranged so as to produce the largest possible intake area, in that the valve is mounted on a cylindrical surface common to the valves of the valve system which serves them seat, and in that the top of the housing 3 serves as an opening stop for the valve.
• the invention also relates to an internal combustion engine chamber which is arranged in the casing, in the cylinder, or between, and which receives a system of valves arranged on orifices.
• the invention relates to an internal combustion engine, in particular of the so-called "two-stroke" type of explosion.
• the invention is characterized in that the engine comprises a system of valves arranged on a distribution chamber, arranged according to the above, intake lights and transfer lights opening into the same room.
• FIG. 4 a partial view of an annular chamber serving as a seat for a valve system according to the invention
• - Figure 5 a partial sectional view of a "two-stroke 11 'internal combustion engine according to the invention"
• FIG. 6 is a vertical section of a variant of the engine cylinder of Figure 5.
• FIG. 7 is a partial end view of the blades formed in the wall of the cylinder of FIG. 6.
• the valves are arranged on a circumference.
• a single valve 20 has been shown with its housing 21 for receiving the end of the return spring (not mounted in the view), two connecting ribs 22 and 23 to a closure plate 25 in a orifice 26 of the inner circumference 27, drilled on a cylindrical plate common to the valves of the valve system, here constituted by the annular distribution chamber, shown in half view.
• a total eight valves were provided (including a valve and four holes are shown in Figure 4).
• the top of the housing 21 serves as an opening stop for the valve.
• the positioning and guiding of the valves is obtained: 5 - by the spring which serves as a connection between its two opposite housings: the housing of the valve spring and the positioning housing 13 (see FIG. 5), on the one hand
• This advantageous arrangement makes it possible to obtain the largest possible intake area in correspondence with the pressure stages over the course of the cycle.
• the housing of the valves is located (FIG. 4) in an annular chamber of small volume (FIG. 5), the transfer ports (7, FIG. 5) forming part of this chamber.
• This advantageous arrangement allows the valves to react to the slightest depression and with the minimum of time.
• the closure plate covers the seat to the right of the orifice of the chamber over a predetermined distance ensuring the sealing of the valve.
• the shape of the valves is in the form of a cylinder portion at the level of the plate 25 (FIG. 4) closing the orifice of the annular chamber.
• This shape gives the valves great rigidity which allows them to be made from technical plastic. Therefore, the weight of a valve is very low (0.5 to 1 grams). 30 This low weight promotes mobility, knowing that it can beat more than 100 times per second.
• the valve guide system has a bearing face and the positioning by the housings of the single return spring 10, 35 (FIG. 5), facilitates assembly and reduces the price and the noise .
• the spring is first mounted in the valve and the valve is slid with its spring on its seat. The spring relaxes in the housing 13 when it arrives in front of it.
• Figure 1 there is shown a rear view of the valve before mounting on the annular chamber.
• It comprises a housing made in a cylindrical part 3, and two ribs like the rib 2, which connect the external wall of the cylindrical housing 3 to the rear face of the closure plate 1 of the orifice 5 (represented in FIG. 4 ).
• FIG. 2 there is shown a front section along the line BB of the valve of Figure 1, section in which we recognize the plate 1 for closing the orifice of the annular chamber (not shown) and the housing of cylindrical body 3, which receives the return spring 10, in FIG. 5.
• FIG 3 there is shown a section along line A-A of the valve of Figure 1, view in which the cylinder portion shape of the closure plate 1 is clearly visible.
• the radius of the cylinder portion is equal to the internal radius R of the internal circumference of the annular chamber on the orifice of which the valve comes to rest under the action of its return spring (10, in Figure 5).
• the shutter plate makes it possible to close properly because of the overpressure or the vacuum, as the case may be, prevailing inside the cylinder during the working cycle of the piston (5 in FIG. 5), l orifice of the chamber by marrying the interior surface of the distribution chamber.
• the top of the housing 3 of the spring 10 serves as an opening stop.
• the chamber of the internal combustion engine of the invention is substantially annular in shape, with a small height relative to its radius R. This radius is also the radius of the shutter plate of the valves. On its outside diameter, the annular chamber has inlet lights and transfer lights on its inside diameter.
• FIG. 5 represents in partial section an "two-stroke" type explosion engine, here composed of an assembly comprising:
• valve system like valve 11.
• Piston 5 is in bottom dead center (P.M.B.).
• the transfer lights 7 are shown in the open position. In this position, the valves can open a second time in the same cycle.
• the valve system (10, 11, 13; Figure 5) is combined with a stage distribution system, adjusted by a two-stage piston (5, Figure 5).
• This arrangement means that there are exhaust lights on the circumference of the second stage of the piston and at the same height.
• transfer lights 7 (FIG. 5) on the first stage and on the entire circumference of the annular chamber 8.
• These exhaust and transfer lights open simultaneously or with a slight offset at the bottom dead center.
• Behind these transfer lights is an annular chamber 8 and opposite the valves 11, seen in section in FIG. 5.
• This annular chamber and the valve surfaces are located in the housing 18, more particularly in the cylindrical part. of the casing serving as support and centering for the cylinders.
• the valves have a bearing in the form of a cylinder portion. They are placed in the casing between the cylinder and the bearing 30 of the rigid coupling which closes and isolates this part of the casing from the rest which represents the limit oiled part of the casing.
• valves are located in the oiled part of the casing.
• the precompression volume is small and located around the transfer lights.
• the exhaust lights 31 can be adjusted to close before the transfer lights 7. In this case, when the exhaust lights 31 close, the gases which arrive in the cylinder at high speed, compress at the bottom of the cylinder creating a depression behind them.
• the exhaust ports 31 are cut in the second stage of the piston 5 and at the end of the latter.
• the seal is made on the piston with the inside of a particular static segment.
• the vacuum causes the valves 11 to open a second time in the same cycle and to fill the cylinders further.
• the annular valve system is combined with a stage distribution system obtained by a two-stage piston 5.
• the exhaust ports 31 are arranged on the second stage of the piston and at the same height.
• the transfer lights are arranged on the first floor folder and at the same height.
• the opening of the exhaust and transfer lights is done simultaneously or with a slight offset.
• the closing of the exhaust lights is done before the closing of the transfer lights 7, there is a compression of the gases in the cylinder and a depression in the intake chamber which causes the valves to open twice in the same cycle. Before compression, a pressure higher than atmospheric pressure is obtained.
• the piston 5 rises in the cylinder 6, it creates a vacuum between the bearing of the rigid coupling and the bottom of the piston.
• This volume is connected to the valves by the transfer ports 7 which communicate with the annular chamber 8 where the valves are located.
• valves open and let pass a volume of air sucked in from the intake ports 12, volume corresponding to the volume of vacuum generated by the displacement of the piston to the top dead center 9 ( in dashed line).
• the volume of compressed air in the annular chamber then passes into the explosion chamber and the cycle continues.
• FIGS. 6 and 7 the cylinder 6 of the engine is shown as a variant, the lower part of which has been machined to have slots 32 along its entire periphery which determine between them the spaces which correspond to the transfer lights.
• the columns of these slots are profiled in the shape of blades with a double angle, in order to orient the fresh gases in rotation around the chimney of the piston.
• injectors 33 oriented in the same direction as the rotation of the gases inject the fuel in a direction which facilitates the most homogeneous mixture possible with 1 * air rais.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Combustion Methods Of Internal-Combustion Engines (AREA)
• Valve-Gear Or Valve Arrangements (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9463293

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (16)

• 1994
  • 1994-05-18 FR FR9406045A patent/FR2720102B1/fr not_active Expired - Fee Related
• 1995
  • 1995-05-17 JP JP7529422A patent/JPH10500189A/ja active Pending
  • 1995-05-17 DE DE69501737T patent/DE69501737T2/de not_active Expired - Fee Related
  • 1995-05-17 US US08/737,632 patent/US5894821A/en not_active Expired - Fee Related
  • 1995-05-17 EP EP95920147A patent/EP0760054B1/de not_active Expired - Lifetime
  • 1995-05-17 RU RU96123922A patent/RU2139994C1/ru active
  • 1995-05-17 WO PCT/FR1995/000639 patent/WO1995031634A1/fr not_active Ceased

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events