EP1674696A1 - Rotary valve - Google Patents
Rotary valve Download PDFInfo
- Publication number
- EP1674696A1 EP1674696A1 EP04030811A EP04030811A EP1674696A1 EP 1674696 A1 EP1674696 A1 EP 1674696A1 EP 04030811 A EP04030811 A EP 04030811A EP 04030811 A EP04030811 A EP 04030811A EP 1674696 A1 EP1674696 A1 EP 1674696A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- air
- rotary valve
- flow path
- lip portion
- 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
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 55
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 230000002000 scavenging effect Effects 0.000 claims description 52
- 239000012212 insulator Substances 0.000 claims description 11
- 239000000446 fuel Substances 0.000 description 36
- 239000000203 mixture Substances 0.000 description 31
- 238000007789 sealing Methods 0.000 description 13
- 239000000567 combustion gas Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
- F02D9/16—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit the members being rotatable
-
- 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
- F02B17/00—Engines characterised by means for effecting stratification of charge in 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
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
Definitions
- the present invention relates to a rotary valve which is disposed between fluid flow paths, and can execute a flow rate adjustment and a flow rate shutoff of a fluid flowing within the fluid flow paths, and more particularly related to a rotary valve which can be used as a lead air control valve of a stratified scavenging two-cycle engine.
- a butterfly type throttle valve and a rotary valve As a valve body which is disposed between fluid flow paths, and can execute a flow rate adjustment and a flow rate shutoff of a fluid flowing within the fluid flow paths, there has been known a butterfly type throttle valve and a rotary valve.
- a lead air control apparatus (for example, refer to Japanese Patent Application Laid-Open (JP-A) No. 2000-328945) employing a butterfly type throttle valve as a lead air control valve of a stratified scavenging two-cycle engine or a carburetor for a two-cycle engine (for example, refer to JP-A No. 9-268918) employing a rotary type throttle valve are proposed by the applicant of the present invention, respectively.
- the lead air control apparatus described in JP-A No. 2000-328945 is provided with a configuration shown in Fig. 7.
- a carburetor 60 having a throttle valve 61 is attached, via an insulator 67, to a first intake passage 62 connected to an intake port 57 open to a cylinder 50, and an intake side of the carburetor 60 is connected to an air cleaner 63.
- Within the insulator 67 there are provided a second intake passage 64 connected to the first intake passage 62, and a lead air passage 65 which is parallel to the second intake passage 64.
- One end of the lead air passage 65 is connected to the air cleaner 63, and the other end is connected to a scavenging port 58 open to the cylinder 50 via a connection pipe 68.
- a butterfly type air control valve 66 for controlling an air flow rate is provided within the lead air passage 65, and works with a throttle valve 61 provided in the second intake passage 64.
- an air-fuel mixture is compressed in a cylinder chamber A at a top dead center position of a piston 51.
- the air-fuel mixture is ignited by a spark plug 52, the air-fuel mixture is exploded, and pushes down the piston 51.
- the scavenging port 58 and a scavenging passage 59 are filled with a lead air purified by the air cleaner 63, and a crank chamber 53 is filled with the air-fuel mixture, in which a fuel and air purified by the air cleaner 63 are mixed, by the carburetor 60.
- the intake port 57 is first closed, and the air-fuel mixture filled in the crank chamber 53 is compressed.
- an exhaust port 54 is opened in accordance with the downward movement of the piston 51, and a combustion gas is discharged to an external portion through an exhaust passage 55 via a muffler 56.
- the scavenging port 58 is opened, and the lead air filled in the scavenging port 58 and the scavenging passage 59 flows into the cylinder chamber A on the basis of a pressure of the compressed air-fuel mixture within the crank chamber 53, and the remaining combustion gas is discharged from the exhaust port 54.
- the amount of the air-fuel mixture passing through the carburetor 60 can be controlled by the throttle valve 61, and the amount of the lead air passing through the air passage 65 can be controlled by the air control valve 66. Since the throttle valve 61 and the air control valve 66 work with each other, it is possible to always keep a balance of the amount of the air-fuel mixture and the amount of the lead air, and it is possible to execute a combustion control under an optimum state.
- the air control valve corresponding to a constituting part which has been conventionally provided between the air cleaner and the carburetor is not required, it is possible to reduce the number of the parts, and since the carburetor can employ a general carburetor, there can be obtained an effect that a cost thereof can be reduced.
- an air passage 83 is connected to a portion in a scavenging passage 82 connecting a scavenging port 81 and a crank chamber 87 of a two-cycle engine, the portion close to the scavenging port 81.
- a check valve 84 allowing an air flow toward the scavenging passage 82 is provided in the air passage 83.
- An air control valve 71 is provided for controlling an amount of air supplied to the air passage 83 from an air cleaner 72, and a rotary type throttle valve 73 is provided as the air control valve 71. Further, the configuration is made such that an air-fuel mixture is supplied to the crank chamber 87 from the air cleaner 72 via a carburetor 70 and a check valve 86.
- an operating lever 88 for driving the throttle valve 74 and a lever (not shown) for actuating the throttle valve 73 are connected to each other by a connection rod 75 so as to freely adjust a mutual interval between the both.
- the carburetor for the two-cycle engine described in JP-A No. 9-268918 takes on the same actuation as that of the lead air control apparatus described in JP-A No. 2000-328945.
- the piston 77 descends by an explosion energy of the air-fuel mixture.
- the combustion gas is discharged to the external portion from a discharge port 79 via an exhaust muffler on the basis of the descending motion of the piston 77, the scavenging port 81 is subsequently opened, and the lead air filled in the scavenging port 81 and the scavenging passage 82 flows into a cylinder chamber B on the basis of the pressure of the compressed air-fuel mixture within the crank chamber 87 and the remaining combustion gas is discharged from the exhaust port 79.
- the air-fuel mixture in the crank chamber 87 flows into the cylinder chamber B via the scavenging passage 82 and the scavenging port 81.
- the lead air inflows first in a state in which the air flowing into the cylinder chamber B from the scavenging port 81 and the air-fuel mixture flowing into the cylinder chamber B from the crank chamber 87 via the scavenging passage 82 and the scavenging port 81 are not mixed but separated, and the air-fuel mixture next flows in.
- the check valve 84 is opened on the basis of the negative pressure of the crank chamber 87, and the air is sucked into the crank chamber 87 from the air cleaner 72 via the air control valve 71, the air passage 83, the check valve 84 and the scavenging passage 82.
- the piston 77 reaches approximately the top dead center in the manner mentioned above, there is achieved a state in which the crank chamber 87 is filled with the air-fuel mixture, and the scavenging passage 82 and the scavenging port 81 are filled only with the air.
- the lead air control apparatus since the lead air control apparatus employs the butterfly type throttle valve and the throttle valve shaft, it is necessary to use and assemble screws or the like for connecting the throttle valve and the throttle valve shaft. Accordingly, if a length of the air passage in the intake side or the cylinder side from an installing position of the valve is long, it is hard to insert a tool and an assembling work or the like is hard to be executed. Therefore, the valve arranged position is limited to a position in which the assembling work can be executed by the tool. Further, it is necessary to bear the throttle valve shaft at both ends thereof, an accuracy of working positions of both holes for bearing the throttle valve shaft is required.
- the rotary type throttle valve 5 is employed in the air control valve C, in order to keep a sealing performance in the rotary type throttle valve 5, it is required to configure an interval between an outer peripheral surface of the valve and an inner diameter surface of the body minimum. In order to form a minimum fixed interval, it is necessary to form the outer peripheral surface of the valve and the inner diameter surface of the body in accordance with an accurate working.
- An object of the present invention is to provide a rotary valve in which it is possible to employ a rotary valve configured such that a gap is intentionally provided between an outer peripheral surface of a valve and an inner diameter portion of a body without making the interval therebetween minimum, and a sealing performance with respect to the gap is provided.
- the object of the present invention can be achieved by each of inventions described in first to seventh aspects.
- a rotary valve disposed between fluid flow paths and having a valve and a body, comprising: a gap formed between an inner diameter portion of the body and an outer peripheral surface of the valve; and seal means disposed between the inner diameter portion of the body and the outer peripheral surface of the valve, wherein the seal means seals between at least one fluid flow path and the gap.
- the seal means has a lip portion and a support portion of the lip portion elastically supports the lip portion.
- the lip portion is brought into contact with the outer peripheral surface of the valve.
- the lip portion is brought into contact with the inner diameter portion of the body.
- a side of a surface of the lip portion, the surface not establishing contact with the inner diameter portion of the body or the outer peripheral surface of the valve is directed to a high pressure fluid side of the fluid flow path.
- the rotary valve described in any one of the first to fifth aspects mentioned above is formed as a lead air control valve of a stratified scavenging two-cycle engine.
- the rotary valve is provided in an insulator connected to an intake port of the stratified scavenging two-cycle engine.
- the seal means for sealing between at least one fluid flow path connected to the rotary valve and the gap is disposed between the inner diameter portion of the body and the outer peripheral surface of the valve.
- the rotary valve in which the gap between the outer peripheral surface of the valve and the inner diameter portion of the body is intentionally expanded to such an interval magnitude as to prevent a heat deformation, a deformation due to an assembly, and malfunction due to a pinching of dust or the like. Moreover, it is possible to securely seal between the gap between the outer peripheral surface of the valve and the inner diameter portion of the body, and the fluid flow path in which the rotary valve is disposed, by the seal means arranged between the inner diameter portion of the body and the outer peripheral surface of the valve.
- the rotary valve capable of reducing the cost as the throttle valve without necessity of the special working and assembly which are required in the butterfly type throttle valve and the conventional rotary valve.
- the rotary valve can be easily manufactured without requiring a high working accuracy for working upon the outer peripheral surface of the valve and the inner diameter surface of the body, it is possible to lower a manufacturing cost of the rotary valve.
- a plurality of valve through holes can be controlled by one component by forming a plurality of valve through holes in the valve of the rotary valve. Further, a large amount of flow rate can be controlled by one rotary valve in accordance with the number of the valve through holes, and it is possible to provide the rotary valve having a simple and compact structure.
- the seal means it is possible to absorb dispersion in the individual parts and improve the sealing performance, by forming the shape of the contact portion of the seal in a lip shape, and applying an elasticity to the support portion of the lip portion formed in the lip shape.
- the contact surface of the lip portion is brought into contact with the outer peripheral surface of the valve or the inner diameter portion of the body, it is possible to seal between at least one fluid flow path connected to the rotary valve and the gap, by the seal means arranged between the inner diameter portion of the body and the outer peripheral surface of the valve.
- the configuration may be made such that elastic energizing means serving as the support portion is provided in one end portion of a seal main body in the seal means, and the lip portion in the other end portion of the seal main body is brought into contact with the outer peripheral surface of the valve or the inner diameter portion of the body.
- the sealing performance with respect to the outer peripheral surface of the valve or the inner diameter portion of the body can be improved by using an energizing force of the elastic energizing means.
- Seal means on the basis of a line contact is formed by constituting the contact surface brought into contact with the outer peripheral surface of the valve or the inner diameter portion of the body in the lip portion by a corner portion of the lip portion, whereby it is possible to lower a working resistance of the valve.
- the contact portion of the lip portion is pressed in a contact direction of the outer peripheral surface of the valve or the inner diameter portion of the body by a high pressure side fluid, so that the sealing performance of the seal means can be improved. Further, when a low pressure fluid side of the fluid flow path connected to the rotary valve comes to a negative pressure, the contact portion of the lip portion is sucked to the side of the outer peripheral surface of the valve or the inner diameter portion of the body, whereby it is possible to improve the sealing performance of the seal means.
- the rotary valve according to the invention When the rotary valve according to the invention is used as the lead air control valve of the stratified scavenging two-cycle engine, the rotary valve can be used as the throttle valve having a low cost. Moreover, it is possible to securely shut off the communication of the lead air so as to prevent the lead air from leaking into the cylinder of the stratified scavenging two-cycle engine at a starting time or an idling time. This makes it possible to prevent the lead air from being introduced into the cylinder of the stratified scavenging two-cycle engine at the starting time or the idling time, and to prevent the engine start from being hard and prevent an idling engine speed from being hard to be adjusted, due to the introduction of the lead air at the starting time.
- the rotary valve according to the invention when the rotary valve according to the invention is provided as the lead air control valve of the stratified scavenging two-cycle engine in the insulator connected to the intake port of the stratified scavenging two-cycle engine, the rotary valve can be freely arranged in the air passage, and the area product can be made small.
- a rotary valve according to the invention the following description is given by using an example in which the rotary valve is provided in a flow path of a lead air in a stratified scavenging two-cycle engine.
- the rotary valve of the invention is not limited to being provided in the flow path of the lead air in the stratified scavenging two-cycle engine, but can be used as a fluid control valve arranged between the fluid flow paths.
- the rotary valve can control a flow rate of a liquid and a gas in addition to the air. Accordingly, the present invention is not limited to the embodiments described below, but can be variously modified.
- Fig. 1 is a front cross sectional view of a stratified scavenging two-cycle engine having a rotary valve 35 serving as a switch valve of a lead air according to an embodiment of the present invention.
- Figs. 2 to 6 show partial enlarging views in a disposed position of the rotary valve according to the invention.
- Figs. 2 and 3 show a working condition of a rotary valve according to a first embodiment of the present invention, in which Fig. 2 shows a state in which the rotary valve is closed, and Fig. 3 shows a state in which the rotary valve is opened.
- Fig. 4 shows a state in which a rotary valve according to a second embodiment of the present invention is closed
- Fig. 5 shows a state in which a rotary valve according to a third embodiment of the present invention is closed.
- Fig. 6 shows a state in which a rotary valve according to a fourth embodiment of the present invention is closed.
- a piston 3 is slidably fitted to a cylinder 2 attached to an upper portion of a crank case 6.
- One end of a crank 9 rotatably supported within a crank chamber 7 is connected to a crank shaft 8 rotatably attached to the crank case 6, and the piston 3 is connected to the crank shaft 8 via a connecting rod 4.
- a spark plug 5 is attached to a top portion of the cylinder 2.
- An exhaust port 10 open to an inner wall surface of the cylinder 2 is connected to a muffler 12 via an exhaust flow path 11.
- a scavenging port 16 is open to a slightly lower side of the exhaust pot 10 in the inner wall surface of the cylinder 2.
- the scavenging port 16 is communicated with the crank chamber 7 by a scavenging flow path 18.
- the scavenging port 16 is also communicated with a first lead air flow path 14 communicated with a rotary valve 35 via a piston groove 17 provided in an outer peripheral portion of the piston 3.
- An intake port 15 open to the crank chamber 7 is formed in a lower portion of the inner wall surface of the cylinder 2, and the intake port 15 is communicated with a second intake flow path 31 communicated with a carburetor 20 via a first intake flow path 13.
- the first intake flow path 13 and the first lead air flow path 14 are respectively connected to a second intake flow path 31 and a second lead air flow path 32 formed in an insulator 30 provided for the purpose of heat insulation. Further, the rotary valve 35 is arranged in the insulator 30, and a third lead air flow path 33 connected to the rotary valve 35 is formed therein.
- the second intake flow path 31 formed in the insulator 30 is connected to the carburetor 20, and the carburetor 20 is connected to a fuel tank (not shown) and an air cleaner 25. Further, the third lead air flow path 33 formed in the insulator 30 is also connected to the air cleaner 25.
- a butterfly type throttle valve 21 is provided in the carburetor 20, and can control a flow rate of an air-fuel mixture.
- the butterfly type throttle valve 21 and the rotary valve 35 are configured such that throttle amounts thereof can be controlled in an interlocking manner by interlocking means such as a link apparatus (not shown).
- the scavenging port 16 and the scavenging flow path 18 are filled with the lead air purified by the air cleaner 25. Further, the crank chamber 7 is filled with the air-fuel mixture in which the fuel and the air purified by the air cleaner 25 are mixed in the carburetor 20.
- the intake port 15 When the piston 3 moves downward, the intake port 15 is first closed, and the air-fuel mixture within the crank chamber 7 is compressed.
- the exhaust port 10 is next opened, and the combustion gas passes through the exhaust flow path 11, and is discharged to an external portion via the muffler 12.
- the scavenging port 16 is opened, and the lead air flows into the cylinder chamber C from the scavenging port 16 on the basis of a pressure of the compressed air-fuel mixture within the crank chamber 7, and the combustion gas remaining in the cylinder chamber C is discharged from the exhaust port 10.
- the air-fuel mixture within the crank chamber 7 flows into the cylinder chamber C.
- the piston 3 is moved upward and comes to a state in which the piston 3 closes the exhaust port 10. Accordingly, the air-fuel mixture is prevented from being discharged to the external portion as it is, it is possible to reduce an amount of hydro carbon HC contained in the exhaust gas, and a loss of the fuel is reduced.
- An amount of the air-fuel mixture passing through the carburetor 20 is controlled by the throttle valve 21, and an amount of the lead air is controlled by the rotary valve 35.
- the throttle amounts of the throttle valve 21 and the rotary valve 35 are controlled in an interlocking manner, whereby it is possible to always keep a balance of the amount of the air-fuel mixture and the amount of the lead air, and it is possible to execute a combustion in an optimum state.
- the rotary valve 35 has a valve 36, a body 37 and seal means 40.
- a valve through hole 38 is formed in the valve 36, and a plurality of valve through holes 38 are formed at a predetermined interval in an axial direction of the valve 36 as occasion demands.
- the seal means 40 has a seal main body 43, and a lip portion 41 supported by a support portion 42 formed in one end portion of the seal main body 43.
- the seal means 40 is formed by a rubber body or the like, and the lip portion 41 is brought into contact with an outer peripheral surface of the valve 36 on the basis of an elastic force of the support portion 42.
- the seal main body 43 is attached to an inner peripheral surface of the second lead air flow path, and an end portion of the seal main body 43 in an opposite side to the side, where the support portion 42 is formed, is brought into contact with a portion near the outer peripheral side end portion of the first lead air flow path 14 formed in the cylinder 2.
- Fig. 2 there is shown a state in which a fluid flow path having the rotary valve disposed in the middle of the fluid flow path is configured by the second lead air flow path 32 and the third lead air flow path 33, a communication between the third lead air flow path 33 and the second lead air flow path 32 is shut off by the valve 36 and the seal means 40, and the rotary valve 35 is closed.
- the supply of the lead air purified by the air cleaner 25 to the piston groove 17 and the scavenging flow path 18 is shut off by shutting off the communication between the third lead air flow path 33 and the second lead air flow path 32 by means of the valve 36 and the seal means 40. Accordingly, it is possible to prevent the lead air from being introduced into the cylinder 2, at a time of the starting time or the idling time of the stratified scavenging two-cycle engine 1.
- the lip portion 41 of the seal means 40 is securely brought into contact with the outer peripheral surface of the valve 36 on the basis of the elastic force of the support portion 42. Further, when the rotary valve 35 is closed at the starting time or the idling time of the stratified scavenging two-cycle engine 1, the second lead air flow path 32 side comes to a negative pressure due to a suction of the crank chamber 7, and the pressure of the lead air within the third lead air flow path 33 comes to a higher pressure than the pressure of the lead air within the second lead air flow path 32.
- the lead air within the third lead air flow path 33 presses a non-contact surface side of the lip portion 41, that is, a back surface side in which the lip portion 41 is not in contact with the outer peripheral surface of the valve 36, through a gap 39 formed between the outer peripheral surface of the valve 36 and an inner diameter portion of the body 37. Further, since the second lead air flow path 32 side comes to the negative pressure, it is possible to suck the surface of the lip portion 41 which is in contact with the outer peripheral surface of the valve 36, thereby strongly pressing the lip portion 41 to the outer peripheral surface of the valve 36.
- the description is given of the case that two operations comprising the pressing operation in the non-contact surface side of the lip portion 41 achieved by the high pressure lead air within the third lead air flow path 33, and the pressing operation to the contact portion of the lip portion 41 achieved by sucking the surface side, which is brought into contact with the outer peripheral surface of the valve 36, in the lip portion 41 due to the negative pressure within the second lead air flow path 32 are simultaneously applied.
- the operation of improving the sealing performance with respect to the lip portion 41 is not applied only to the case that two operations mentioned above are simultaneously applied, but the operation of improving the sealing performance with respect to the lip portion 41 can be achieved even in the case that only one operation is applied to the lip portion 41.
- Fig. 3 shows a state in which the valve 36 is rotationally controlled on the basis of an external operation, and the third lead air flow path 33 and the second lead air flow path 32 are communicated by the valve through hole 38 formed in the valve 41, that is, a state in which the rotary valve 35 is opened.
- the support portion 42 elastically supporting the lip portion 41 executes an elastic deformation, and a rotational resistance of the valve 36 can be reduced.
- Fig. 4 shows a second embodiment according to the present invention.
- the second embodiment is provide with the same configuration as that of the first embodiment except the configuration of the seal means. Therefore, a description of the same members will be omitted by using the same reference numerals of the members as those in the first embodiment.
- the second embodiment shows a modified example of the support portion.
- An elastic piece 44 is formed in one end portion of the seal main body 43, and achieves an operation of the support portion. Further, the seal main body 43 is slidably inserted to an inner diameter surface of the second lead air flow path 32.
- the seal main body 43 slides to a right side in Fig. 4 due to an elastic force of the elastic piece 44, and the lip portion 41 in the other end portion of the seal main body 43 is brought into contact with the outer peripheral surface of the valve 36.
- the elastic piece 44 serving as the support portion is also provided with a function of sealing an outer peripheral portion of the first lead air flow path 14 formed in the cylinder 2, and can securely seal between the second lead air flow path 32 and a flow path passing through a gap formed between the outer peripheral surface of the valve 36 and the inner diameter portion of the body 37 from the third lead air flow path 33.
- the seal main body 43 slides in a direction of deflecting the elastic piece 44, whereby it is possible to reduce a rotational resistance of the valve 36 by the seal means 40.
- Fig. 4 there is shown an example in which the lip portion directly supported by the support portion as in the first embodiment is not formed in the seal means 40 brought into contact with the outer peripheral surface of the valve 36.
- the lip portion elastically supported by the support portion as shown in the first embodiment may be formed in an end portion brought into contact with the outer peripheral surface of the valve 36 in the seal main body 43.
- the rotational resistance of the valve 36 can be reduced due to a synergetic effect obtained by the elastic deformation of the lip portion and the elastic piece 44 at a time when the valve 36 is rotated.
- the contact between the seal means 40 and the valve 36 according to the second embodiment can be set in a surface contact state, but, it is desirable that they are brought into contact with each other in an approximately line contact state.
- the seal means 40 of the second embodiment it is possible to achieve the pressing operation applied to the non-contact surface side of the lip portion 41 on the basis of the high pressure lead air within the third lead air flow path 33, and the sucking operation applied to the lip portion 41 on the basis of the suction of the surface brought into contact with the outer peripheral surface of the valve 36 in the lip portion 41 due to the negative pressure within the second lead air flow path 32, in the second embodiment in the same manner as the case of the first embodiment.
- the configuration may be made such that the lip portion has a corner portion so as to allow the contact portion between the lip portion brought into contact with the outer peripheral surface of the valve 36 in the seal main body 43 and the outer peripheral surface of the valve 36 to be in contact with each other in an approximately line contact state. At this time, it is possible to reduce the rotational resistance on the basis of the contact between the lip portion and the valve 36 at a time of the rotation of the rotary valve 35.
- Fig. 5 shows a third embodiment of the present invention.
- the third embodiment is provide with the same configuration as that of the first embodiment except that the seal means is arranged in the outer peripheral portion of the valve 36. Therefore, a description of the same members will be omitted by using the same reference numerals of the members as those in the first embodiment.
- the seal means 40 is formed in the outer peripheral surface of the valve 36.
- the seal main body 43 and the lip portion 41 are formed in such a configuration that the third lead air flow path 33 and the gap 39 are sealed therebetween by the seal means 40 at a time when the valve through hole 38 exists at a position shown in Fig. 5 and makes the second lead air flow path 32 and the third lead air flow path 33 in a non-communicated state.
- the seal means 40 according to the third embodiment it is possible to achieve the pressing operation applied to the non-contact surface side of the lip portion 41 on the basis of the high pressure lead air within the third lead air flow path 33, and the sucking operation applied to the lip portion 41 on the basis of the suction of the surface brought into contact with the inner diameter surface of the body 37 in the lip portion 41 due to the negative pressure within the second lead air flow path 32, in the third embodiment in the same manner as the case of the first embodiment.
- the seal main body 43 is rotated in response to the rotation of the valve 36, and the lip portion 41 is rotated along the inner diameter surface of the body 37 while being in contact. Since the lip portion 41 is elastically supported by the support portion 42, it is possible to reduce the rotational resistance from the lip portion 41 at a time when the valve 36 is rotated.
- the configuration is made such that the lip portion 41 has a corner portion so as to allow the contact portion between the lip portion 41 and the inner diameter surface of the body 37 to be in contact with each other in an approximately line contact state, thereby making it possible to reduce the rotational resistance on the basis of the contact between the lip portion 41 and the inner diameter surface of the body 37 at a time of the rotation of the rotary valve 35.
- Fig. 6 shows a fourth embodiment of the present invention.
- the fourth embodiment is provide with the same configuration as that of the first embodiment except that the seal means is attached to an inner side of the third lead air flow path 33 and the lip portion 41 is formed inward. Therefore, a description of the same members will be omitted by using the same reference numerals of the members as those in the first embodiment.
- the seal means 40 is attached to an inner side of the third lead air flow path 33 corresponding to a connection flow path to the air cleaner 25 shown in Fig. 1, and the lip portion 41 is formed inward in a reverse manner to the case of the first to third embodiments. Accordingly, it is possible to press the non-contact surface side of the lip portion 41 by the lead air having the higher pressure than that of the lead air within the second lead air flow path 32 from the third lead air flow path 33, so that the sealing performance between the lip portion 41 and the outer peripheral surface of the valve 36 can be improved.
- the inner side of the second lead air flow path 32 comes to the negative pressure at the starting time and the idling time of the stratified scavenging two-cycle engine 1, the surface brought into contact with the outer peripheral surface of the valve 36 in the lip portion 41 is sucked. Therefore, it is possible to increase the pressing force applied to the outer surface of the valve 36 in the lip portion 41, and the sealing performance of the seal means 40 can be improved.
- the configuration is made such that the lip portion 41 has a corner portion so as to allow the contact portion between the lip portion 41 and the outer peripheral surface of the valve 36 to be in contact with each other in an approximately line contact state, thereby making it possible to reduce the rotational resistance on the basis of the contact between the lip portion 41 and the outer peripheral surface of the valve 36 at a time of the rotation of the rotary valve 35.
- the elastic piece may be formed in the side of the air cleaner 25 of the seal main body 43 as in the second embodiment. Furthermore, the configuration may be made such that the configuration of the seal means according to the fourth embodiment is added to the configuration of the seal means according to the first to third embodiments.
- the present invention relates to the rotary valve which can be disposed within the fluid flow path, the technical idea of the present invention can be applied to the apparatus which can employ the rotary valve.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
- The present invention relates to a rotary valve which is disposed between fluid flow paths, and can execute a flow rate adjustment and a flow rate shutoff of a fluid flowing within the fluid flow paths, and more particularly related to a rotary valve which can be used as a lead air control valve of a stratified scavenging two-cycle engine.
- Conventionally, as a valve body which is disposed between fluid flow paths, and can execute a flow rate adjustment and a flow rate shutoff of a fluid flowing within the fluid flow paths, there has been known a butterfly type throttle valve and a rotary valve. In particular, a lead air control apparatus (for example, refer to Japanese Patent Application Laid-Open (JP-A) No. 2000-328945) employing a butterfly type throttle valve as a lead air control valve of a stratified scavenging two-cycle engine or a carburetor for a two-cycle engine (for example, refer to JP-A No. 9-268918) employing a rotary type throttle valve are proposed by the applicant of the present invention, respectively.
- The lead air control apparatus described in JP-A No. 2000-328945 is provided with a configuration shown in Fig. 7. In other words, a
carburetor 60 having athrottle valve 61 is attached, via aninsulator 67, to afirst intake passage 62 connected to anintake port 57 open to acylinder 50, and an intake side of thecarburetor 60 is connected to anair cleaner 63. Within theinsulator 67, there are provided asecond intake passage 64 connected to thefirst intake passage 62, and alead air passage 65 which is parallel to thesecond intake passage 64. One end of thelead air passage 65 is connected to theair cleaner 63, and the other end is connected to ascavenging port 58 open to thecylinder 50 via aconnection pipe 68. A butterfly typeair control valve 66 for controlling an air flow rate is provided within thelead air passage 65, and works with athrottle valve 61 provided in thesecond intake passage 64. - As shown in Fig. 7, an air-fuel mixture is compressed in a cylinder chamber A at a top dead center position of a
piston 51. In this state, when the air-fuel mixture is ignited by aspark plug 52, the air-fuel mixture is exploded, and pushes down thepiston 51. At this time point, thescavenging port 58 and ascavenging passage 59 are filled with a lead air purified by theair cleaner 63, and acrank chamber 53 is filled with the air-fuel mixture, in which a fuel and air purified by theair cleaner 63 are mixed, by thecarburetor 60. - When the
piston 51 moves downward, theintake port 57 is first closed, and the air-fuel mixture filled in thecrank chamber 53 is compressed. Next, anexhaust port 54 is opened in accordance with the downward movement of thepiston 51, and a combustion gas is discharged to an external portion through anexhaust passage 55 via amuffler 56. Subsequently, thescavenging port 58 is opened, and the lead air filled in thescavenging port 58 and thescavenging passage 59 flows into the cylinder chamber A on the basis of a pressure of the compressed air-fuel mixture within thecrank chamber 53, and the remaining combustion gas is discharged from theexhaust port 54. - Thereafter, the air-fuel mixture within the
crank chamber 53 flows into the cylinder chamber A. However, since thepiston 51 moves upward and theexhaust port 54 is closed at this time, the air-fuel mixture is prevented from being discharged to the external portion, an amount of hydro carbon HC contained in the exhaust gas is reduced, and it is possible to reduce a loss of the fuel. - The amount of the air-fuel mixture passing through the
carburetor 60 can be controlled by thethrottle valve 61, and the amount of the lead air passing through theair passage 65 can be controlled by theair control valve 66. Since thethrottle valve 61 and theair control valve 66 work with each other, it is possible to always keep a balance of the amount of the air-fuel mixture and the amount of the lead air, and it is possible to execute a combustion control under an optimum state. - Accordingly, in the invention described in JP-A No. 2000-328945 , since the
air control valve 66 is provided within theair passage 65 for the lead air within theinsulator 67, there can be obtained such effects that theair control valve 66 can be provided within a limited space without requiring an area product, it is possible to make an entire length L of a whole of the engine shown in Fig. 1 short, and it is possible to obtain a light and compact stratified scavenging two-cycle engine. - Further, since the air control valve corresponding to a constituting part which has been conventionally provided between the air cleaner and the carburetor is not required, it is possible to reduce the number of the parts, and since the carburetor can employ a general carburetor, there can be obtained an effect that a cost thereof can be reduced.
- Next, the carburetor for the two-cycle engine described in JP-A No. 9-268918 is provided with a configuration shown in Fig. 8. In other words, an
air passage 83 is connected to a portion in ascavenging passage 82 connecting ascavenging port 81 and acrank chamber 87 of a two-cycle engine, the portion close to thescavenging port 81. Acheck valve 84 allowing an air flow toward thescavenging passage 82 is provided in theair passage 83. - An
air control valve 71 is provided for controlling an amount of air supplied to theair passage 83 from anair cleaner 72, and a rotarytype throttle valve 73 is provided as theair control valve 71. Further, the configuration is made such that an air-fuel mixture is supplied to thecrank chamber 87 from theair cleaner 72 via acarburetor 70 and acheck valve 86. In order to open and close thethrottle valve 73 of theair control valve 71 so as to work with an opening and closing motion of thethrottle valve 74 in thecarburetor 70, anoperating lever 88 for driving thethrottle valve 74 and a lever (not shown) for actuating thethrottle valve 73 are connected to each other by aconnection rod 75 so as to freely adjust a mutual interval between the both. - The carburetor for the two-cycle engine described in JP-A No. 9-268918 takes on the same actuation as that of the lead air control apparatus described in JP-A No. 2000-328945. When the air-fuel mixture compressed in an upper portion of a
piston 77 is ignited by aspark plug 78, thepiston 77 descends by an explosion energy of the air-fuel mixture. The combustion gas is discharged to the external portion from adischarge port 79 via an exhaust muffler on the basis of the descending motion of thepiston 77, thescavenging port 81 is subsequently opened, and the lead air filled in thescavenging port 81 and thescavenging passage 82 flows into a cylinder chamber B on the basis of the pressure of the compressed air-fuel mixture within thecrank chamber 87 and the remaining combustion gas is discharged from theexhaust port 79. - Next, the air-fuel mixture in the
crank chamber 87 flows into the cylinder chamber B via thescavenging passage 82 and thescavenging port 81. The lead air inflows first in a state in which the air flowing into the cylinder chamber B from thescavenging port 81 and the air-fuel mixture flowing into the cylinder chamber B from thecrank chamber 87 via thescavenging passage 82 and thescavenging port 81 are not mixed but separated, and the air-fuel mixture next flows in. - Next, when the
piston 77 moves into an ascending stroke from the bottom dead center and reaches a position near the top dead center, thecrank chamber 87 becomes in a negative pressure state, thecheck valve 86 of anintake port 85 is opened, and the air-fuel mixture generated in thecarburetor 70 is sucked into thecrank chamber 87 from theintake port 85. - Further, the
check valve 84 is opened on the basis of the negative pressure of thecrank chamber 87, and the air is sucked into thecrank chamber 87 from theair cleaner 72 via theair control valve 71, theair passage 83, thecheck valve 84 and thescavenging passage 82. When thepiston 77 reaches approximately the top dead center in the manner mentioned above, there is achieved a state in which thecrank chamber 87 is filled with the air-fuel mixture, and thescavenging passage 82 and thescavenging port 81 are filled only with the air. - In the invention described in JP-A No. 9-268918, it is possible to lock an end portion of the
connection rod 75 for driving thethrottle valve 74 of thecarburetor 70 and thethrottle valve 73 of theair control valve 71 in an interlocking manner, by selecting an adjusting hole of anoperating lever 88 or an adjusting hole of the lever (not shown) of theair control valve 71. Accordingly, it is possible to obtain an optimum opening degree of thethrottle valve 73 in theair control valve 71 with respect to an opening degree of thethrottle valve 74. - Accordingly, since it is possible to flow out only the air first flowing into the cylinder chamber B at the scavenging stroke to the
exhaust port 79 together with the combustion gas, and hold the air-fuel mixture flowing into the cylinder chamber B after the lead air in the cylinder chamber B, a scavenging efficiency can be made high. As a result, it is possible to reduce an amount of an unburned component (HC) contained in the exhaust gas, thereby effectively using the fuel with no loss. Therefore, there can be achieved an effect that an output of the two-cycle engine cab be increased. - In the invention described in JP-A No. 2000-328945, since the lead air control apparatus employs the butterfly type throttle valve and the throttle valve shaft, it is necessary to use and assemble screws or the like for connecting the throttle valve and the throttle valve shaft. Accordingly, if a length of the air passage in the intake side or the cylinder side from an installing position of the valve is long, it is hard to insert a tool and an assembling work or the like is hard to be executed. Therefore, the valve arranged position is limited to a position in which the assembling work can be executed by the tool. Further, it is necessary to bear the throttle valve shaft at both ends thereof, an accuracy of working positions of both holes for bearing the throttle valve shaft is required.
- Although, in the invention described in JP-A No.9-268918, the rotary
type throttle valve 5 is employed in the air control valve C, in order to keep a sealing performance in the rotarytype throttle valve 5, it is required to configure an interval between an outer peripheral surface of the valve and an inner diameter surface of the body minimum. In order to form a minimum fixed interval, it is necessary to form the outer peripheral surface of the valve and the inner diameter surface of the body in accordance with an accurate working. - An object of the present invention is to provide a rotary valve in which it is possible to employ a rotary valve configured such that a gap is intentionally provided between an outer peripheral surface of a valve and an inner diameter portion of a body without making the interval therebetween minimum, and a sealing performance with respect to the gap is provided.
- The object of the present invention can be achieved by each of inventions described in first to seventh aspects.
- In other words, in accordance with a most main feature of the present invention, as described in a first aspect of the invention, there is provided a rotary valve disposed between fluid flow paths and having a valve and a body, comprising: a gap formed between an inner diameter portion of the body and an outer peripheral surface of the valve; and seal means disposed between the inner diameter portion of the body and the outer peripheral surface of the valve, wherein the seal means seals between at least one fluid flow path and the gap.
- Further, in accordance with a main feature of the present invention, as described in a second aspect of the invention, the seal means has a lip portion and a support portion of the lip portion elastically supports the lip portion.
- Further, in accordance with a main feature of the present invention, as described in a third aspect of the invention, the lip portion is brought into contact with the outer peripheral surface of the valve.
- Further, in accordance with a main feature of the present invention, as described in a fourth aspect of the invention, the lip portion is brought into contact with the inner diameter portion of the body.
- Further, in accordance with a main feature of the present invention, as described in a fifth aspect of the invention, a side of a surface of the lip portion, the surface not establishing contact with the inner diameter portion of the body or the outer peripheral surface of the valve, is directed to a high pressure fluid side of the fluid flow path.
- Further, in accordance with a main feature of the present invention, as described in a sixth aspect of the invention, the rotary valve described in any one of the first to fifth aspects mentioned above is formed as a lead air control valve of a stratified scavenging two-cycle engine.
- Further, in accordance with a main feature of the present invention, as described in a seventh aspect of the invention, the rotary valve is provided in an insulator connected to an intake port of the stratified scavenging two-cycle engine.
- In accordance with the present invention, in the rotary valve in which the gap is formed between the inner diameter portion of the body and the outer peripheral surface of the valve, it is the characteristic feature that the seal means for sealing between at least one fluid flow path connected to the rotary valve and the gap is disposed between the inner diameter portion of the body and the outer peripheral surface of the valve.
- Accordingly, it is possible to employ the rotary valve in which the gap between the outer peripheral surface of the valve and the inner diameter portion of the body is intentionally expanded to such an interval magnitude as to prevent a heat deformation, a deformation due to an assembly, and malfunction due to a pinching of dust or the like. Moreover, it is possible to securely seal between the gap between the outer peripheral surface of the valve and the inner diameter portion of the body, and the fluid flow path in which the rotary valve is disposed, by the seal means arranged between the inner diameter portion of the body and the outer peripheral surface of the valve.
- Accordingly, it is possible to easily employ the rotary valve capable of reducing the cost as the throttle valve without necessity of the special working and assembly which are required in the butterfly type throttle valve and the conventional rotary valve. Moreover, since the rotary valve can be easily manufactured without requiring a high working accuracy for working upon the outer peripheral surface of the valve and the inner diameter surface of the body, it is possible to lower a manufacturing cost of the rotary valve. In addition, it is possible to prevent the heat deformation, the deformation due to the assembly, and the malfunction due to the pinching of the dust or the like, by the gap between the outer peripheral surface of the valve and the inner diameter portion of the body.
- Further, it is not necessary to configure the throttle valve and the throttle valve shaft by the separate bodies as is different from the butterfly type throttle valve, and a plurality of valve through holes can be controlled by one component by forming a plurality of valve through holes in the valve of the rotary valve. Further, a large amount of flow rate can be controlled by one rotary valve in accordance with the number of the valve through holes, and it is possible to provide the rotary valve having a simple and compact structure.
- With respect to the seal means, it is possible to absorb dispersion in the individual parts and improve the sealing performance, by forming the shape of the contact portion of the seal in a lip shape, and applying an elasticity to the support portion of the lip portion formed in the lip shape. In the case that the contact surface of the lip portion is brought into contact with the outer peripheral surface of the valve or the inner diameter portion of the body, it is possible to seal between at least one fluid flow path connected to the rotary valve and the gap, by the seal means arranged between the inner diameter portion of the body and the outer peripheral surface of the valve.
- Further, the configuration may be made such that elastic energizing means serving as the support portion is provided in one end portion of a seal main body in the seal means, and the lip portion in the other end portion of the seal main body is brought into contact with the outer peripheral surface of the valve or the inner diameter portion of the body. In accordance with the configuration, the sealing performance with respect to the outer peripheral surface of the valve or the inner diameter portion of the body can be improved by using an energizing force of the elastic energizing means.
- Seal means on the basis of a line contact is formed by constituting the contact surface brought into contact with the outer peripheral surface of the valve or the inner diameter portion of the body in the lip portion by a corner portion of the lip portion, whereby it is possible to lower a working resistance of the valve.
- By disposing a non-contact surface side of the lip portion with respect to the inner diameter portion of the body or the outer peripheral surface of the valve so as to be directed to the high pressure fluid side of a fluid flow path, the contact portion of the lip portion is pressed in a contact direction of the outer peripheral surface of the valve or the inner diameter portion of the body by a high pressure side fluid, so that the sealing performance of the seal means can be improved. Further, when a low pressure fluid side of the fluid flow path connected to the rotary valve comes to a negative pressure, the contact portion of the lip portion is sucked to the side of the outer peripheral surface of the valve or the inner diameter portion of the body, whereby it is possible to improve the sealing performance of the seal means.
- When the rotary valve according to the invention is used as the lead air control valve of the stratified scavenging two-cycle engine, the rotary valve can be used as the throttle valve having a low cost. Moreover, it is possible to securely shut off the communication of the lead air so as to prevent the lead air from leaking into the cylinder of the stratified scavenging two-cycle engine at a starting time or an idling time. This makes it possible to prevent the lead air from being introduced into the cylinder of the stratified scavenging two-cycle engine at the starting time or the idling time, and to prevent the engine start from being hard and prevent an idling engine speed from being hard to be adjusted, due to the introduction of the lead air at the starting time.
- Further, when the rotary valve according to the invention is provided as the lead air control valve of the stratified scavenging two-cycle engine in the insulator connected to the intake port of the stratified scavenging two-cycle engine, the rotary valve can be freely arranged in the air passage, and the area product can be made small.
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- Fig. 1 is a schematic front cross sectional view showing an entire view of the present invention (embodiment).
- Fig. 2 is a schematic cross sectional view showing a closed state of a rotary valve (first embodiment).
- Fig. 3 is a schematic cross sectional view showing an open and closed state of the rotary valve (first embodiment).
- Fig. 4 is a schematic cross sectional view showing a closed state of a rotary valve (second embodiment).
- Fig. 5 is a schematic cross sectional view showing a closed state of a rotary valve (third embodiment).
- Fig. 6 is a schematic cross sectional view showing a closed state of a rotary valve (fourth embodiment).
- Fig. 7 is a schematic front cross sectional view showing an entire view of a conventional art.
- Fig. 8 is a schematic front cross sectional view showing an entire view of another conventional art.
- A preferable embodiment of the present invention will be specifically explainedbelow, with reference to the accompanying drawings. With respect to a rotary valve according to the invention, the following description is given by using an example in which the rotary valve is provided in a flow path of a lead air in a stratified scavenging two-cycle engine. However, the rotary valve of the invention is not limited to being provided in the flow path of the lead air in the stratified scavenging two-cycle engine, but can be used as a fluid control valve arranged between the fluid flow paths.
- Furthermore, with respect to a fluid which can be controlled by the rotary valve of the invention, the rotary valve can control a flow rate of a liquid and a gas in addition to the air. Accordingly, the present invention is not limited to the embodiments described below, but can be variously modified.
- Fig. 1 is a front cross sectional view of a stratified scavenging two-cycle engine having a
rotary valve 35 serving as a switch valve of a lead air according to an embodiment of the present invention. Figs. 2 to 6 show partial enlarging views in a disposed position of the rotary valve according to the invention. Figs. 2 and 3 show a working condition of a rotary valve according to a first embodiment of the present invention, in which Fig. 2 shows a state in which the rotary valve is closed, and Fig. 3 shows a state in which the rotary valve is opened. - Fig. 4 shows a state in which a rotary valve according to a second embodiment of the present invention is closed, and Fig. 5 shows a state in which a rotary valve according to a third embodiment of the present invention is closed. Further, Fig. 6 shows a state in which a rotary valve according to a fourth embodiment of the present invention is closed.
- As shown in Fig. 1, as a stratified scavenging two-cycle engine 1, a
piston 3 is slidably fitted to acylinder 2 attached to an upper portion of a crankcase 6. One end of a crank 9 rotatably supported within acrank chamber 7 is connected to a crankshaft 8 rotatably attached to the crankcase 6, and thepiston 3 is connected to the crankshaft 8 via a connectingrod 4. Further, aspark plug 5 is attached to a top portion of thecylinder 2. - An
exhaust port 10 open to an inner wall surface of thecylinder 2 is connected to amuffler 12 via an exhaust flow path 11. A scavengingport 16 is open to a slightly lower side of theexhaust pot 10 in the inner wall surface of thecylinder 2. The scavengingport 16 is communicated with thecrank chamber 7 by a scavengingflow path 18. The scavengingport 16 is also communicated with a first leadair flow path 14 communicated with arotary valve 35 via apiston groove 17 provided in an outer peripheral portion of thepiston 3. - An
intake port 15 open to the crankchamber 7 is formed in a lower portion of the inner wall surface of thecylinder 2, and theintake port 15 is communicated with a secondintake flow path 31 communicated with acarburetor 20 via a firstintake flow path 13. - The first
intake flow path 13 and the first leadair flow path 14 are respectively connected to a secondintake flow path 31 and a second leadair flow path 32 formed in aninsulator 30 provided for the purpose of heat insulation. Further, therotary valve 35 is arranged in theinsulator 30, and a third leadair flow path 33 connected to therotary valve 35 is formed therein. - The second
intake flow path 31 formed in theinsulator 30 is connected to thecarburetor 20, and thecarburetor 20 is connected to a fuel tank (not shown) and anair cleaner 25. Further, the third leadair flow path 33 formed in theinsulator 30 is also connected to theair cleaner 25. - A butterfly
type throttle valve 21 is provided in thecarburetor 20, and can control a flow rate of an air-fuel mixture. The butterflytype throttle valve 21 and therotary valve 35 are configured such that throttle amounts thereof can be controlled in an interlocking manner by interlocking means such as a link apparatus (not shown). - Next, a description will be given of an actuation of the stratified scavenging two-cycle engine 1. At a top dead center position of the
piston 3 shown in Fig. 1, when the air-fuel mixture compressed in the cylinder chamber C is ignited by thespark plug 5, the air-fuel mixture is exploded and pushes down thepiston 3 downward. - At this time point, the scavenging
port 16 and the scavengingflow path 18 are filled with the lead air purified by theair cleaner 25. Further, thecrank chamber 7 is filled with the air-fuel mixture in which the fuel and the air purified by theair cleaner 25 are mixed in thecarburetor 20. - When the
piston 3 moves downward, theintake port 15 is first closed, and the air-fuel mixture within thecrank chamber 7 is compressed. In accordance with the downward movement of thepiston 3, theexhaust port 10 is next opened, and the combustion gas passes through the exhaust flow path 11, and is discharged to an external portion via themuffler 12. Subsequently, the scavengingport 16 is opened, and the lead air flows into the cylinder chamber C from the scavengingport 16 on the basis of a pressure of the compressed air-fuel mixture within thecrank chamber 7, and the combustion gas remaining in the cylinder chamber C is discharged from theexhaust port 10. - Following to the inflow of the lead air to the cylinder chamber C, the air-fuel mixture within the
crank chamber 7 flows into the cylinder chamber C. However, when the air-fuel mixture flows into the cylinder chamber C, thepiston 3 is moved upward and comes to a state in which thepiston 3 closes theexhaust port 10. Accordingly, the air-fuel mixture is prevented from being discharged to the external portion as it is, it is possible to reduce an amount of hydro carbon HC contained in the exhaust gas, and a loss of the fuel is reduced. - An amount of the air-fuel mixture passing through the
carburetor 20 is controlled by thethrottle valve 21, and an amount of the lead air is controlled by therotary valve 35. The throttle amounts of thethrottle valve 21 and therotary valve 35 are controlled in an interlocking manner, whereby it is possible to always keep a balance of the amount of the air-fuel mixture and the amount of the lead air, and it is possible to execute a combustion in an optimum state. - As shown in Fig. 2, the
rotary valve 35 has avalve 36, abody 37 and seal means 40. A valve throughhole 38 is formed in thevalve 36, and a plurality of valve throughholes 38 are formed at a predetermined interval in an axial direction of thevalve 36 as occasion demands. The seal means 40 has a sealmain body 43, and alip portion 41 supported by asupport portion 42 formed in one end portion of the sealmain body 43. - The seal means 40 is formed by a rubber body or the like, and the
lip portion 41 is brought into contact with an outer peripheral surface of thevalve 36 on the basis of an elastic force of thesupport portion 42. The sealmain body 43 is attached to an inner peripheral surface of the second lead air flow path, and an end portion of the sealmain body 43 in an opposite side to the side, where thesupport portion 42 is formed, is brought into contact with a portion near the outer peripheral side end portion of the first leadair flow path 14 formed in thecylinder 2. - In Fig. 2, there is shown a state in which a fluid flow path having the rotary valve disposed in the middle of the fluid flow path is configured by the second lead
air flow path 32 and the third leadair flow path 33, a communication between the third leadair flow path 33 and the second leadair flow path 32 is shut off by thevalve 36 and the seal means 40, and therotary valve 35 is closed. - The supply of the lead air purified by the
air cleaner 25 to thepiston groove 17 and the scavengingflow path 18 is shut off by shutting off the communication between the third leadair flow path 33 and the second leadair flow path 32 by means of thevalve 36 and the seal means 40. Accordingly, it is possible to prevent the lead air from being introduced into thecylinder 2, at a time of the starting time or the idling time of the stratified scavenging two-cycle engine 1. - The
lip portion 41 of the seal means 40 is securely brought into contact with the outer peripheral surface of thevalve 36 on the basis of the elastic force of thesupport portion 42. Further, when therotary valve 35 is closed at the starting time or the idling time of the stratified scavenging two-cycle engine 1, the second leadair flow path 32 side comes to a negative pressure due to a suction of thecrank chamber 7, and the pressure of the lead air within the third leadair flow path 33 comes to a higher pressure than the pressure of the lead air within the second leadair flow path 32. - Accordingly, the lead air within the third lead
air flow path 33 presses a non-contact surface side of thelip portion 41, that is, a back surface side in which thelip portion 41 is not in contact with the outer peripheral surface of thevalve 36, through agap 39 formed between the outer peripheral surface of thevalve 36 and an inner diameter portion of thebody 37. Further, since the second leadair flow path 32 side comes to the negative pressure, it is possible to suck the surface of thelip portion 41 which is in contact with the outer peripheral surface of thevalve 36, thereby strongly pressing thelip portion 41 to the outer peripheral surface of thevalve 36. - In this manner, a sealing effect by the seal means 40 is improved, and the shutoff of the lead air can be securely achieved by the
rotary valve 35. Furthermore, since thelip portion 41 is elastically supported by thesupport portion 42 supporting thelip portion 41, it is possible to more effectively achieve the shutoff of the lead air by therotary valve 35. - In the description mentioned above, the description is given of the case that two operations comprising the pressing operation in the non-contact surface side of the
lip portion 41 achieved by the high pressure lead air within the third leadair flow path 33, and the pressing operation to the contact portion of thelip portion 41 achieved by sucking the surface side, which is brought into contact with the outer peripheral surface of thevalve 36, in thelip portion 41 due to the negative pressure within the second leadair flow path 32 are simultaneously applied. However, the operation of improving the sealing performance with respect to thelip portion 41 is not applied only to the case that two operations mentioned above are simultaneously applied, but the operation of improving the sealing performance with respect to thelip portion 41 can be achieved even in the case that only one operation is applied to thelip portion 41. - Fig. 3 shows a state in which the
valve 36 is rotationally controlled on the basis of an external operation, and the third leadair flow path 33 and the second leadair flow path 32 are communicated by the valve throughhole 38 formed in thevalve 41, that is, a state in which therotary valve 35 is opened. When thevalve 36 is rotated, thesupport portion 42 elastically supporting thelip portion 41 executes an elastic deformation, and a rotational resistance of thevalve 36 can be reduced. - Further, it is possible to reduce a rotational resistance caused by the contact with the
lip portion 41 at a time of the rotation of therotary valve 36, by employing a configuration having a corner portion in thelip portion 41 so as to allow the contact portion between thelip portion 41 and the outer peripheral surface of thevalve 36 to be brought into contact in an approximately line contact state. - Fig. 4 shows a second embodiment according to the present invention. The second embodiment is provide with the same configuration as that of the first embodiment except the configuration of the seal means. Therefore, a description of the same members will be omitted by using the same reference numerals of the members as those in the first embodiment.
- As shown in Fig. 4, the second embodiment shows a modified example of the support portion. An
elastic piece 44 is formed in one end portion of the sealmain body 43, and achieves an operation of the support portion. Further, the sealmain body 43 is slidably inserted to an inner diameter surface of the second leadair flow path 32. When attaching theinsulator 30 to thecylinder 2 as shown in Fig. 1, the sealmain body 43 slides to a right side in Fig. 4 due to an elastic force of theelastic piece 44, and thelip portion 41 in the other end portion of the sealmain body 43 is brought into contact with the outer peripheral surface of thevalve 36. - At this time, the
elastic piece 44 serving as the support portion is also provided with a function of sealing an outer peripheral portion of the first leadair flow path 14 formed in thecylinder 2, and can securely seal between the second leadair flow path 32 and a flow path passing through a gap formed between the outer peripheral surface of thevalve 36 and the inner diameter portion of thebody 37 from the third leadair flow path 33. - When the
valve 36 is rotated in accordance with an external control, the sealmain body 43 slides in a direction of deflecting theelastic piece 44, whereby it is possible to reduce a rotational resistance of thevalve 36 by the seal means 40. In this case, in Fig. 4, there is shown an example in which the lip portion directly supported by the support portion as in the first embodiment is not formed in the seal means 40 brought into contact with the outer peripheral surface of thevalve 36. However, the lip portion elastically supported by the support portion as shown in the first embodiment may be formed in an end portion brought into contact with the outer peripheral surface of thevalve 36 in the sealmain body 43. - In the case that the lip portion directly supported by the support portion is formed in the end portion brought into contact with the outer peripheral surface of the
valve 36 in the sealmain body 43, the rotational resistance of thevalve 36 can be reduced due to a synergetic effect obtained by the elastic deformation of the lip portion and theelastic piece 44 at a time when thevalve 36 is rotated. Further, in either of the case that the lip portion directly supported by the support portion is formed or the case that it is not formed, the contact between the seal means 40 and thevalve 36 according to the second embodiment can be set in a surface contact state, but, it is desirable that they are brought into contact with each other in an approximately line contact state. - Moreover, in either of the case that the lip portion directly supported by the support portion is formed or the case that it is not formed, in the seal means 40 of the second embodiment, it is possible to achieve the pressing operation applied to the non-contact surface side of the
lip portion 41 on the basis of the high pressure lead air within the third leadair flow path 33, and the sucking operation applied to thelip portion 41 on the basis of the suction of the surface brought into contact with the outer peripheral surface of thevalve 36 in thelip portion 41 due to the negative pressure within the second leadair flow path 32, in the second embodiment in the same manner as the case of the first embodiment. - In addition, the configuration may be made such that the lip portion has a corner portion so as to allow the contact portion between the lip portion brought into contact with the outer peripheral surface of the
valve 36 in the sealmain body 43 and the outer peripheral surface of thevalve 36 to be in contact with each other in an approximately line contact state. At this time, it is possible to reduce the rotational resistance on the basis of the contact between the lip portion and thevalve 36 at a time of the rotation of therotary valve 35. - Fig. 5 shows a third embodiment of the present invention. The third embodiment is provide with the same configuration as that of the first embodiment except that the seal means is arranged in the outer peripheral portion of the
valve 36. Therefore, a description of the same members will be omitted by using the same reference numerals of the members as those in the first embodiment. - As shown in Fig. 5, in the third embodiment, the seal means 40 is formed in the outer peripheral surface of the
valve 36. The sealmain body 43 and thelip portion 41 are formed in such a configuration that the third leadair flow path 33 and thegap 39 are sealed therebetween by the seal means 40 at a time when the valve throughhole 38 exists at a position shown in Fig. 5 and makes the second leadair flow path 32 and the third leadair flow path 33 in a non-communicated state. - In the seal means 40 according to the third embodiment, it is possible to achieve the pressing operation applied to the non-contact surface side of the
lip portion 41 on the basis of the high pressure lead air within the third leadair flow path 33, and the sucking operation applied to thelip portion 41 on the basis of the suction of the surface brought into contact with the inner diameter surface of thebody 37 in thelip portion 41 due to the negative pressure within the second leadair flow path 32, in the third embodiment in the same manner as the case of the first embodiment. - The seal
main body 43 is rotated in response to the rotation of thevalve 36, and thelip portion 41 is rotated along the inner diameter surface of thebody 37 while being in contact. Since thelip portion 41 is elastically supported by thesupport portion 42, it is possible to reduce the rotational resistance from thelip portion 41 at a time when thevalve 36 is rotated. - Further, the configuration is made such that the
lip portion 41 has a corner portion so as to allow the contact portion between thelip portion 41 and the inner diameter surface of thebody 37 to be in contact with each other in an approximately line contact state, thereby making it possible to reduce the rotational resistance on the basis of the contact between thelip portion 41 and the inner diameter surface of thebody 37 at a time of the rotation of therotary valve 35. - Fig. 6 shows a fourth embodiment of the present invention. The fourth embodiment is provide with the same configuration as that of the first embodiment except that the seal means is attached to an inner side of the third lead
air flow path 33 and thelip portion 41 is formed inward. Therefore, a description of the same members will be omitted by using the same reference numerals of the members as those in the first embodiment. - As shown in Fig. 6, in the fourth embodiment, the seal means 40 is attached to an inner side of the third lead
air flow path 33 corresponding to a connection flow path to theair cleaner 25 shown in Fig. 1, and thelip portion 41 is formed inward in a reverse manner to the case of the first to third embodiments. Accordingly, it is possible to press the non-contact surface side of thelip portion 41 by the lead air having the higher pressure than that of the lead air within the second leadair flow path 32 from the third leadair flow path 33, so that the sealing performance between thelip portion 41 and the outer peripheral surface of thevalve 36 can be improved. - Further, since the inner side of the second lead
air flow path 32 comes to the negative pressure at the starting time and the idling time of the stratified scavenging two-cycle engine 1, the surface brought into contact with the outer peripheral surface of thevalve 36 in thelip portion 41 is sucked. Therefore, it is possible to increase the pressing force applied to the outer surface of thevalve 36 in thelip portion 41, and the sealing performance of the seal means 40 can be improved. - At a time of the rotation of the
valve 36, it is possible to reduce the rotational resistance of thevalve 36 generated by the contact with thelip portion 41 on the basis of the elastic force of thesupport portion 42. Further, the configuration is made such that thelip portion 41 has a corner portion so as to allow the contact portion between thelip portion 41 and the outer peripheral surface of thevalve 36 to be in contact with each other in an approximately line contact state, thereby making it possible to reduce the rotational resistance on the basis of the contact between thelip portion 41 and the outer peripheral surface of thevalve 36 at a time of the rotation of therotary valve 35. - In the fourth embodiment, the elastic piece may be formed in the side of the
air cleaner 25 of the sealmain body 43 as in the second embodiment. Furthermore, the configuration may be made such that the configuration of the seal means according to the fourth embodiment is added to the configuration of the seal means according to the first to third embodiments. - Although the present invention relates to the rotary valve which can be disposed within the fluid flow path, the technical idea of the present invention can be applied to the apparatus which can employ the rotary valve.
Claims (7)
- A rotary valve (35) disposed between fluid flow paths and having a valve (36) and a body (37), characterized by comprising:a gap (39) formed between an inner diameter portion of the body (37) and an outer peripheral surface of the valve (36) ; andseal means (40) disposed between the inner diameter portion of the body (37) and the outer peripheral surface of the valve (36),
wherein the seal means (40) seals between at least one fluid flow path and the gap (39). - The rotary valve (35) according to claim 1, being characterized in that the seal means (40) has a lip portion (41), and a support portion (42) of the lip portion (41) elastically supports the lip portion (41).
- The rotary valve (35) according to claim 2, being characterized in that the lip portion (41) is brought into contact with the outer peripheral surface of the valve (36).
- The rotary valve (35) according to claim 2, being characterized in that the lip portion (41) is brought into contact with the inner diameter portion of the body (37).
- The rotary valve (35) according to claim 3 or 4, being characterized in that a side of a surface of the lip portion (41), the surface not establishing contact with the inner diameter portion of the body (37) or the outer peripheral surface of the valve (36), is directed to a high pressure fluid side of the fluid flow path.
- The rotary valve (35) according to any one of claims 1 to 5, being characterized in that the rotary valve (35) is formed as a lead air control valve of a stratified scavenging two-cycle engine.
- The rotary valve (35) according to claim 6, being characterized in that the rotary valve (35) is provided in an insulator connected to an intake port of the stratified scavenging two-cycle engine.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20040030811 EP1674696B1 (en) | 2004-12-27 | 2004-12-27 | Rotary valve |
DE200460029917 DE602004029917D1 (en) | 2004-12-27 | 2004-12-27 | rotary vane |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20040030811 EP1674696B1 (en) | 2004-12-27 | 2004-12-27 | Rotary valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1674696A1 true EP1674696A1 (en) | 2006-06-28 |
EP1674696B1 EP1674696B1 (en) | 2010-11-03 |
Family
ID=34928004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20040030811 Active EP1674696B1 (en) | 2004-12-27 | 2004-12-27 | Rotary valve |
Country Status (2)
Country | Link |
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EP (1) | EP1674696B1 (en) |
DE (1) | DE602004029917D1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09268918A (en) | 1996-04-03 | 1997-10-14 | Komatsu Zenoah Co | Carburettor for 2-cycle internal combustion engine |
JP2000328945A (en) | 1999-05-21 | 2000-11-28 | Komatsu Zenoah Co | Lead air control device for stratified scavenging two cycle engine |
DE19924397A1 (en) * | 1999-05-27 | 2000-11-30 | Bayerische Motoren Werke Ag | Valve-controlled IC engine, esp. Otto engine intake aperture with front control edge section with leading recess to generate compact charging jet |
DE20119880U1 (en) * | 2001-12-07 | 2002-04-18 | Dolmar Gmbh | Two-stroke engine with fresh air supply delay |
EP1281839A2 (en) * | 2001-07-31 | 2003-02-05 | Bayerische Motoren Werke Aktiengesellschaft | Rotary valve arrangement for the charge control of an internal combustion engine |
DE10218176A1 (en) * | 2002-04-24 | 2003-11-06 | Bayerische Motoren Werke Ag | Rotary disk valve for controlling flow of induction air to IC engine has seal mounted in either inlet or outlet which fits against disk when valve is closed but is held away from it when valve is open |
-
2004
- 2004-12-27 DE DE200460029917 patent/DE602004029917D1/en active Active
- 2004-12-27 EP EP20040030811 patent/EP1674696B1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09268918A (en) | 1996-04-03 | 1997-10-14 | Komatsu Zenoah Co | Carburettor for 2-cycle internal combustion engine |
JP2000328945A (en) | 1999-05-21 | 2000-11-28 | Komatsu Zenoah Co | Lead air control device for stratified scavenging two cycle engine |
DE19924397A1 (en) * | 1999-05-27 | 2000-11-30 | Bayerische Motoren Werke Ag | Valve-controlled IC engine, esp. Otto engine intake aperture with front control edge section with leading recess to generate compact charging jet |
EP1281839A2 (en) * | 2001-07-31 | 2003-02-05 | Bayerische Motoren Werke Aktiengesellschaft | Rotary valve arrangement for the charge control of an internal combustion engine |
DE20119880U1 (en) * | 2001-12-07 | 2002-04-18 | Dolmar Gmbh | Two-stroke engine with fresh air supply delay |
DE10218176A1 (en) * | 2002-04-24 | 2003-11-06 | Bayerische Motoren Werke Ag | Rotary disk valve for controlling flow of induction air to IC engine has seal mounted in either inlet or outlet which fits against disk when valve is closed but is held away from it when valve is open |
Also Published As
Publication number | Publication date |
---|---|
EP1674696B1 (en) | 2010-11-03 |
DE602004029917D1 (en) | 2010-12-16 |
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