WO2005047672A1 - 角度を成す弁軸間の伝導結合機構 - Google Patents
角度を成す弁軸間の伝導結合機構 Download PDFInfo
- Publication number
- WO2005047672A1 WO2005047672A1 PCT/JP2004/016863 JP2004016863W WO2005047672A1 WO 2005047672 A1 WO2005047672 A1 WO 2005047672A1 JP 2004016863 W JP2004016863 W JP 2004016863W WO 2005047672 A1 WO2005047672 A1 WO 2005047672A1
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- Prior art keywords
- cam
- cam member
- contact
- valve
- shaft
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/04—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by mechanical control linkages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
- F02M19/12—External control gear, e.g. having dash-pots
- F02M19/124—Connecting rods between at least two throttle valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M23/00—Apparatus for adding secondary air to fuel-air mixture
- F02M23/02—Apparatus for adding secondary air to fuel-air mixture with personal control, or with secondary-air valve controlled by main combustion-air throttle
- F02M23/03—Apparatus for adding secondary air to fuel-air mixture with personal control, or with secondary-air valve controlled by main combustion-air throttle the secondary air-valve controlled by main combustion-air throttle
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- 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
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
- F02D2009/0201—Arrangements; Control features; Details thereof
- F02D2009/0206—Arrangements; Control features; Details thereof specially positioned with relation to engine or engine housing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention drives the leading air control valve shaft of a stratified scavenging two-cycle engine and an air-fuel mixture throttle valve shaft of a carburetor arranged at an angle such as an oblique state or a twisted state. It concerns the conduction coupling mechanism.
- the leading air that has flowed into the cylinder earlier during the scavenging stroke flows out to the exhaust port together with the combustion gas, and the mixing force that flows into the cylinder after the leading air also flows.
- the air can stay in the cylinder. This prevents the so-called blow-by phenomenon in which the air-fuel mixture flowing into the cylinder is exhausted to the atmosphere together with the combustion gas into the exhaust port, so that the exhaust gas concentration can be significantly reduced, and fuel consumption is also wasted. Can be reduced.
- a conductive coupling mechanism is used as the mechanism.
- a cam mechanism is disclosed in Japanese Patent Application Laid-Open No. 2000-314350 (Patent Document 1). Also, a diaphragm carburetor using a link mechanism has been proposed.
- the diaphragm carburetor described in Patent Document 1 has a configuration as shown in FIG. That is, the throttle lever shaft 63 of the throttle valve disposed in the carburetor casing 60 carries an operation lever 66 at one end.
- the operation lever 66 is disposed at one end 67 of the throttle valve shaft 63 so as not to rotate relatively, and is elastically urged in a valve closing direction of the throttle valve 62 via a return spring 68.
- the operating lever 66 is connected to a carburetor control cable or the like in an unillustrated manner. The opening of the throttle valve arranged in the carburetor casing 60 can be adjusted.
- a lever 69 is carried on the other end 67 'of the throttle valve shaft 63 so as to be relatively non-rotatable.
- a lever 71 is carried on the end 70 of the shaft 65 of the leading air control valve.
- the throttle valve shaft 63 and the lead air control valve shaft 65 are arranged in parallel, and the levers 69 and 71 are connected to each other via a pull rod 72.
- One end of the pull rod 72 is rotatably engaged with the lever 71, and the other end is disposed in a vertical slit 74 provided on the lever 69 so as to extend substantially in the rotation direction 73.
- a link mechanism as the conductive coupling portion 76 is constituted by the levers 69, 71 and the pull rod 72.
- a transmission coupling portion 76 formed between the lead air control valve shaft 65 and the throttle valve shaft 63 is driven by the rotation of the throttle valve shaft 63, and the position of the lead air control valve and the vaporization depend on the position.
- a connection with the metering valve 62 is provided.
- a return spring 68 acts on the throttle valve shaft 63 in the valve closing direction of the throttle valve 62
- a coil spring 75 acts on the shaft 65 of the leading air control valve correspondingly.
- the coil spring 75 determines the closing position of the butterfly type throttle valve configured as a leading air control valve.
- the home positions of the throttle valve shaft 63 and the leading air control valve shaft 65 can be determined by a return spring 68 and a coil spring 75, respectively.
- a throttle valve shaft 63 and a shaft 65 arranged in parallel have a cam contour portion 80 and a cam contour portion 81, respectively.
- Lever 69 'and 71' are attached.
- the throttle valve shaft 63 moves in the valve opening direction 73 together with the throttle valve in the air squeezer in the opening direction 73 by the force of the return spring 68, the shaft 65 of the leading air control valve is turned to the lever 69 'at the time of idling and in the lower range of the idling. It is not operated until the idling path portion 77 between the free end 79 of the lever 71 and the free end 78 of the lever 71 'is overcome.
- Patent Document 1 JP-A-2000-314350
- the applicant of the present invention has proposed a solution in which the leading air control valve shaft and the air-fuel mixture throttle valve shaft of the carburetor are arranged in an oblique or twisted state. Being done! If the leading air control valve shaft and the mixture throttle valve shaft of the carburetor are arranged in an oblique or twisted state, the configuration of the conduction coupling mechanism for conducting coupling between the two valve shafts becomes a problem.
- An object of the present invention is to provide a conductive coupling mechanism between angled valve shafts made to solve the problem of the configuration of the conductive coupling mechanism.
- a link mechanism or a cam mechanism is used as a conductive coupling mechanism between the leading air control valve shaft and the throttle valve shaft of the carburetor.
- a conduction coupling mechanism is provided for a configuration in which the leading air control valve shaft and the throttle valve shaft of the carburetor are arranged in parallel. For this reason, when increasing the amount of leading air, the problem that the structural area becomes large as described above occurs.
- the throttle valve is used.
- the shaft 7 (in the present application, the throttle valve shaft 63) and the throttle mechanism 14 (the throttle valve 64 in the present application) of the air pipe 15 (not shown in the present application) and the shaft 24 (in the present application, the shaft 65.) Are forces that are nearly parallel, are arranged at an angle to each other It is also suitable. (As in the original text. The terms in parentheses indicate the terms and drawing symbols used in the column ⁇ Background Art> in the present application.).
- Patent Document 1 describes that the thrust force is also suitable for the case where the throttle valve shaft and the shaft of the throttle mechanism of the air pipe are arranged at an angle to each other as described above, In the case where the throttle valve shaft and the shaft of the throttle mechanism of the air pipe are arranged so as to form an angle with each other, a configuration and a solution capable of operating the link mechanism and the cam mechanism three-dimensionally are described. Is not disclosed, described, or even suggested. Furthermore, it is even recognized that there is a problem with three-dimensional movement.
- the present invention does not sacrifice the field in the height direction of a stratified scavenging two-cycle engine when the leading air control valve shaft and the mixture throttle valve shaft of the carburetor form an angle.
- the main purpose is to provide a conductive coupling mechanism that can make a stratified scavenging two-cycle engine compact.
- the above-described object is to provide one of a leading air control valve shaft and a mixture throttle valve shaft of a carburetor in a stratified scavenging two-cycle engine, which is a basic configuration of the present invention, in which one drive shaft is driven and the other is driven A drive shaft and a driven shaft, wherein the drive shaft and the driven shaft are arranged at an angle, and the conductive coupling mechanism is integrally formed with the drive shaft and the driven shaft, respectively.
- a first cam member and a second cam member rotatably arranged and in contact with each other; and a contact surface of the first cam member when the contact between the first cam member and the second cam member is conducted.
- one of the first cam member and the second cam member has a cam plate force having a cam surface, and the other cam member force comes into contact with the cam surface. And a lever having a contact.
- a contact surface of at least one of the first cam member and the second cam member with the other cam member extends parallel to a valve shaft on which the one cam member is arranged. Preferably.
- first cam member and the second cam member is arranged along the drive shaft or the driven shaft provided with the first cam member or the second cam member, and the other second cam member. Alternatively, it may be slidably biased in the direction of the first cam member.
- the leading coupling air control valve shaft of the stratified scavenging two-stroke engine arranged at an angle and the mixture coupling throttle valve shaft of the carburetor are driven in conjunction with each other by a conduction coupling mechanism.
- One of the air control valve shaft and the mixture throttle valve shaft is a drive shaft, and the other valve shaft is a driven shaft.
- the force of the pair of the first cam member and the second force member disposed on the drive shaft and the driven shaft, respectively, is changed to a part of the contact surface of the first cam member during the contact conduction between the two cam members.
- the configuration is such that a part of the contact surface of the two cam members is always kept in contact.
- leading air control valve shaft and the air-fuel mixture throttle valve shaft which are arranged at an angle, can be conductively coupled via the first force member and the second cam member.
- the contact force between the contact surface of the first cam member and the contact surface of the second cam member always maintains a contact state, so that when the leading air control valve shaft and the air-fuel mixture throttle valve shaft rotate, It is possible to prevent the first cam member and the second cam member from interfering with each other, so that the two contact surfaces do not come into contact with each other and hinder the rotation of the valve shaft.
- leading air control valve shaft and the air-fuel mixture throttle valve shaft can be arranged at an angle with respect to each other, it is assumed that a plurality of leading air pipes are arranged to increase the amount of leading air. Can be configured without increasing the field of the stratified scavenging two-cycle engine.
- the use of the pair of first and second cam members ensures that the drive shaft is reliably rotated by the conductive coupling mechanism between the angled valve shafts. Is transmitted to the sub-coaxial.
- a cam plate having a cam surface is in contact with the cam surface. And a pair of cam plates each having a cam surface.
- a pin or a rotating roll may be attached as a contact near the end of the lever.
- a bent portion formed by bending the tip of the lever, a bent portion formed integrally with the lever, or the like can be formed as a contact. Sliding resistance generated between the contact and the cam surface by making the contact and the cam surface a linear contact or a point contact, such as a cylindrical shape, a spherical shape, a rotating roll shape, etc. Can be reduced.
- a cam groove may be formed on the cam plate, and the inner surface of the cam groove may be used as the cam surface.
- the cam groove is formed in the cam plate, one of the inner peripheral surfaces of the cam groove can always be brought into contact with the contactor when the drive shaft reciprocates.
- dust or the like enters the leading air control valve shaft or the air-fuel mixture throttle valve shaft, and even when the valve shaft is not functioning properly, the dust is disposed on the leading air control valve shaft and the air-fuel mixture throttle valve shaft, respectively.
- the return panel force of the existing panel can be used as a resultant force, and can be applied to each valve shaft using the resultant force.
- valve shaft can be rotated in the valve closing direction.
- the closing force the return panel force of each panel is used as the resultant force, and both valve shafts can be turned in the valve closing direction, so that the panel force of the panels arranged on both valve shafts can be reduced.
- the throttle operation load for opening and closing the throttle valve of the vaporizer can be reduced.
- the shape of the contact surface of at least one of the first cam member and the second cam member that contacts the other cam member is as follows. It may be configured as a shape extending in parallel with the valve shaft on which the one cam member is arranged.
- a first cam member is provided on a driven shaft, a cam plate having a cam surface is provided as the first cam member, and a second cam member is provided on a drive shaft, and the second cam member is provided.
- the cam surface is constituted by a lever having a contact that comes into contact with the cam surface
- the cam surface can be formed to extend in parallel with the sub-coaxial.
- the first cam member or the second cam member can be configured by disposing a contact formed of a pin or the like on a lever with a pin extending parallel to the drive shaft.
- At least one of the first cam member and the second force member is connected to the drive shaft or the driven shaft provided with the one cam member. It is possible to adopt a configuration in which the cam members are slidably disposed along the axis and one of the cam members is biased in a direction toward the other cam member.
- At least one of the cam members is always urged in a direction approaching the other cam member, and is slidably disposed along the axis on which the one cam member is disposed. Even if the contact position between the first cam member and the second cam member changes three-dimensionally with the rotation of the shaft, the first cam member and the second cam member can be kept in the contact conduction state. For this reason, even if the first cam member and the second cam member move three-dimensionally, a part of the contact surface of the first cam member always contacts a part of the contact surface of the second cam member.
- the rotation of the drive shaft can be transmitted coaxially.
- one of the first cam member and the second cam member may be slid, or the first cam member and the second cam member may be moved closer to each other. It can also be slidably biased in each direction.
- the urging means for urging the cam member in the axial direction a coil panel or the like can be used.
- the urging means may be used as a return panel for urging the leading air control valve and the Z or mixing throttle valve in the closing direction.
- FIG. 1 is a schematic front sectional view showing an overall view of the present invention.
- FIG. 2 is a plan view of a transmission coupling mechanism. (Example 1)
- FIG. 3 is a side view as viewed from the left in FIG. 2.
- Example 1 [FIG. 4] A plan view of the conductive coupling mechanism in an operating state.
- Example 1 [FIG. 5] A side view as viewed from the left in FIG. (Example 1)
- FIG. 6 is a plan view showing another embodiment of the conductive coupling mechanism.
- Example 2 [FIG. 7] A plan view showing an operation state in another example.
- FIG. 8 is a plan view of a conventional diaphragm carburetor. (Conventional example)
- FIG. 9 is a plan view seen from the left in FIG. 8. (Conventional example)
- FIG. 10 is a plan view showing a cam mechanism in a conventional example. (Conventional example) Explanation of reference numerals
- a rotary valve is used as a leading air control valve for leading air in a stratified scavenging two-stroke engine
- a leading air control valve of the present invention a butterfly type is used.
- a throttle valve such as a throttle valve It can be.
- a description will be given of a case where a butterfly type throttle valve is used as a gas-fuel mixture throttle valve in a vaporizer, but a throttle valve such as a rotary valve can be used as a gas-fuel mixture throttle valve.
- the configuration of the stratified scavenging two-cycle engine and the like described below is described as a typical configuration of a stratified scavenging two-cycle engine and the like, and the present invention is applied to a stratified scavenging two-cycle engine having another configuration. Can be applied.
- the shape of the cam and the shape of the contact in the conductive coupling mechanism of the present invention are not limited to those described below, as long as they can solve the problem of the present invention. Can be adopted. For this reason, the present invention is not limited to the embodiments described below, and various modifications can be made.
- FIG. 1 is a front sectional view of a stratified scavenging two-cycle engine according to an embodiment of the present invention.
- FIG. 2 is a plan view showing the conductive coupling mechanism.
- FIG. 3 is a side view as viewed from the left side of FIG.
- FIG. 4 is a plan view showing an operation state of the conductive coupling mechanism.
- FIG. 5 is a side view as viewed from the left side of FIG. 6 and 7 are plan views showing operating states of the conductive coupling mechanism in another embodiment.
- a piston 3 is slidably fitted in a cylinder 2 attached to an upper part of a crankcase 6.
- One end of a crank 9 rotatably supported in a crankcase 7 is connected to a crankshaft 8 rotatably attached to a crankcase 6, and a piston 3 is connected via a connecting rod 4.
- An ignition plug 5 is attached to the top of the cylinder 2.
- An exhaust port 10 opened on the inner wall surface of the cylinder 2 is connected to a muffler 12 via an exhaust passage 11.
- a scavenging port 16 is opened slightly below the exhaust port 10 on the inner wall surface of the cylinder 2.
- the scavenging port 16 communicates with the crank chamber 7 via a scavenging flow path 18. Further, the scavenging port 16 communicates with a first leading air flow path 14 which communicates with a rotary valve 35 serving as a leading air control valve via a piston groove 17 provided on an outer peripheral portion of the piston 3.
- An intake port 15 opened to the crank chamber 7 is formed at a lower portion of the inner wall surface of the cylinder 2, and the intake port 15 communicates with the carburetor 20 via the first intake passage 13 through the second intake flow. Road 31 and Communicating.
- the first intake passage 13 and the first leading air passage 14 are respectively connected to a second intake passage 31 and a second leading air passage 32 formed in an insulator 30 for heat insulation.
- a rotary valve 35 as a leading air control valve is provided in the insulator 30, and the rotary valve 35 rotates around a valve shaft 27 shown in FIG.
- a third leading air passage 33 connected to the rotary valve 35 is formed in the insulator 30.
- the second intake passage 31 formed in the insulator 30 is connected to the carburetor 20, and the carburetor 20 is connected to a fuel tank and an air cleaner 25 (not shown). Further, a third leading air passage 33 formed in the insulator 30 is also connected to the air cleaner 25.
- the vaporizer 20 is provided with a butterfly type air-fuel mixture throttle valve 21, which can rotate around a valve shaft 22 to control the flow rate of the air-fuel mixture.
- the opening of the notch-type air-fuel mixture throttle valve 21 is controlled by an operation lever 29 as shown in FIG.
- the operation lever 29 is operated by a carburetor cable or the like (not shown).
- a cam plate 28 is attached to the end of the valve shaft 27 of the rotary valve, and a cam groove 28c is formed in the cam plate 28.
- a panel 46 is disposed on the valve shaft 27 as shown in FIG. 3, and biases the valve shaft 27 or the cam plate 28 in a direction to close the rotary valve 35.
- a lever 23 is attached to the valve shaft 22 of the air-fuel mixture throttle valve 21, and the lever 23 is provided with a contact 24 that engages with the cam groove 28 c of the force plate 28.
- a panel 45 is disposed on the valve shaft 22 as shown in FIG. 3, and biases the valve shaft 22 or the lever 23 in a direction to close the mixture throttle valve 21.
- the panel 45 arranged on the valve shaft 22 can be arranged on the operation lever 29 side shown in FIG. 2 instead of being arranged on the lever 23 side.
- the cam plate 28 and the lever 23 constitute a cam mechanism as a conductive coupling mechanism.
- the rotary valve 35 as a leading air control valve and the mixture throttle valve 21 of the carburetor 20 can be driven in conjunction with each other, and the respective throttle amounts, that is, the opening degrees, are controlled. It is configured to: The operation of the conductive coupling mechanism will be described in detail in the following description of FIGS. 2-5.
- the scavenging port 16 and the scavenging channel 18 are filled with the leading air purified by the air cleaner 25.
- the crank chamber 7 is filled with a mixture of fuel and air purified by the air cleaner 25.
- the intake port 15 is closed first, and the air-fuel mixture in the crank chamber 7 is compressed.
- the exhaust port 10 is opened, and the combustion gas passes through the exhaust passage 11 and is discharged to the outside via the muffler 12.
- the scavenging port 16 is opened, and the leading air flows into the cylinder chamber A from the scavenging port 16 due to the pressure of the compressed air-fuel mixture in the crank chamber 7, and the combustion gas remaining in the cylinder chamber A is discharged to the exhaust port 10.
- the amount of the air-fuel mixture passing through the vaporizer 20 is controlled by the air-fuel mixture throttle valve 21, and the amount of the leading air is controlled by the rotary valve 35. Since the control of the throttle amount of the air-fuel mixture throttle valve 21 and the rotary valve 35, that is, the opening degree, is controlled in conjunction with the conduction coupling mechanism, the balance between the air-fuel mixture amount and the amount of leading air is always maintained and optimized. Combustion can be performed in a stable state.
- valve shaft 27 of the leading air control valve and the valve shaft 22 of the air-fuel mixture throttle valve 21 are arranged at an angle. Accordingly, for example, by arranging a plurality of rotary valves 35 along the direction of the valve shaft 27 in FIG. 3, it is possible to increase the number of leading air pipes, and without increasing the structural area. The number of leading air pipes that can be integrally controlled by the valve shaft 27 can be increased. Thereby, the exhaust gas component can be further reduced.
- a cam plate 28 as a cam member and a lever 23 are provided on a valve shaft 27 of a leading air control valve and a valve shaft 22 of an air-fuel mixture throttle valve 21 which are arranged at an angle, respectively. And attach I am. Further, the valve shaft 27 and the cam plate 28 and the valve shaft 22 and the lever 23 can rotate integrally, respectively. As shown in FIG. 3, the valve shaft 27 has the leading air control valve in the closing direction. A panel 46 for urging the air-fuel mixture throttle valve in the valve closing direction is disposed on the valve shaft 22.
- the cam plate 28 attached to the valve shaft 27 of the leading air control valve has a cam groove 28c with an open end.
- cam groove 28c On the inner surface of the cam groove 28c, bifurcated cam surfaces 28a and 28b are respectively formed.
- the cam surface formed on the cam plate 28 may be a cam surface formed on the contour of the cam plate 28 or a cam groove 28c as shown in FIG.
- the shape of the cam groove may be formed as a closed cam groove whose tip end is not open.
- a lever 23 is attached to the valve shaft 22 of the air-fuel mixture throttle valve 21, and a contact 24 is provided near the end of the lever 23.
- the contact 24 may have a configuration in which a pin or a rotating roll is attached near the end of the lever 23.
- a bent portion formed by bending the tip of the lever, a bent portion formed integrally with the lever, or the like is formed as the contact 24.
- the contact 24 and the cam surfaces 28a and 28b are in line contact or point contact with each other, such as a cylindrical shape, a spherical shape, a rotating roll shape, or the like.
- the sliding resistance between the surfaces 28a and 28b can be reduced.
- FIGS. 2 and 3 show a state in which the leading air control valve and the air-fuel mixture throttle valve 21 are arranged in the home position, and the contact 24 and the cam surface 28b are placed in a non-contact state. ing. As shown in FIG. 3, the vicinity of the distal end of the contact 24 is disposed in a state inserted into the cam groove 28c.
- valve shaft 22 When the operation of the operation lever 29 shown in FIG. 2 causes the valve shaft 22 to rotate counterclockwise, the valve shaft 22 rotates a predetermined amount in the counterclockwise direction, and then the valve shaft 27 of the leading air control valve. Rotates interlockingly. That is, before the valve shaft 27 of the leading air control valve is interlockedly rotated by the gap formed between the contact 24 and the cam surface 28b of the cam groove 28c, the air-fuel mixture throttle valve of the vaporizer 20 is rotated.
- the 21 valve shafts 22 can be rotated by a predetermined amount.
- the gap formed between the contact 24 and the cam surface 28b can control the leading air to flow into the cylinder at the time of idling or starting of the engine.
- the air-fuel mixture throttle valve 21 is opened by turning the valve shaft 22 in the counterclockwise direction in FIG. 2, and the leading air control valve is turned by rotating the valve shaft 27 in the clockwise direction. Is described as opening.
- the operation lever 29 can be operated by a carburetor cable (not shown) or the like.
- FIGS. 4 and 5 show the state in which the leading air control valve is rotated in the valve opening direction.
- FIGS. 4 and 5 show a state in which the valve shaft 22 is rotated by approximately 80 degrees while the valve shaft 22 is approximately 75 degrees, and the rotation angles of the valve shaft 22 and the valve shaft 27 are approximately 75 degrees, respectively.
- the rotation angle required to open the valve is not limited to rotation of about 80 degrees, and can be set to any angle.
- the contact surface 24 of the lever 23 provided on the valve shaft 22 and the cam surface of the cam plate 28 provided on the valve shaft 27 The trajectory of the contact portion with 28b draws a three-dimensional trajectory.
- the contact 24 since the length of the contact 24 is formed so as to extend in parallel with the axis of the valve shaft 22, the contact 24 always has a force S regardless of the rotation of the valve shaft 22. The state of contact with the cam surface 28b can be maintained.
- the rotation of the cam plate 28 and the rotation of the lever 23 are arranged so as not to interfere with each other, the rotation of the valve shaft 22 is hindered by the collision between the cam plate 28 and the lever 23. Such a situation does not occur. Therefore, the rotation of the lever 23 can be smoothly and conductively coupled as the rotation of the cam plate 28.
- the rotation of the cam plate 28 rotates the valve shaft 27, and rotates the rotary valve 35 as a leading air control valve shown in FIG. 1 so that the air cleaner 25 communicates with the scavenging port 16. it can.
- a cam mechanism constituted by a cam plate 28, a lever 23, and a contact 24 arranges the valve shaft 27 of the leading air control valve and the valve shaft 22 of the air-fuel mixture throttle valve 21 at an angle. Even the rotor The opening of the lee valve 35 can be linked with the opening of the air-fuel mixture throttle valve 21 of the carburetor 20 to always maintain the balance between the amount of air-fuel mixture and the amount of leading air to control combustion in an optimal state. It can be carried out.
- the states of FIGS. 2 and 3 are described as the home position state, and the states of FIGS. 3 and 4 are described as the valve open state.
- the states of FIGS. The valve state can be set, and the states in FIGS. 4 and 5 can be set to the home position state.
- the operating lever 29 shown in FIGS. 2 and 3 is operated to close the leading air control valve and the mixture throttle valve 21.
- the valve shaft 22 is to be rotated back in the clockwise direction in FIG. 4, the panel 46 provided on the valve shaft 27 and the panel 45 provided on the valve shaft 22 shown in FIGS.
- the return plate causes the force plate 28 and the lever 23 to rotate, thereby rotating the rotary valve 35 and the mixture throttle valve 21 in the valve closing direction, that is, returning to the home position state. it can.
- the contactor 24 is pressed by the cam surface 28b of the cam plate 28 that rotates back by the panel 46, and the lever 23 is moved. It can be turned clockwise in Figure 4.
- the cam plate 28 can be rotated counterclockwise in FIG. 4 by the contact surface 24 pressing the cam surface 28a.
- the opening degree of the air-fuel mixture throttle valve 21 of the carburetor 20 can maintain an appropriate opening degree according to the opening degree of the leading air control valve. Therefore, appropriate fuel can be supplied to the cylinder. Thus, it is possible to prevent damage to the engine caused by overheating or overspeed of the engine.
- the mixture throttle valve 21 of the carburetor 20 can be used. Can be maintained at an appropriate opening in accordance with the opening of the leading air control valve.
- valve shaft 22 and the valve shaft 27 can be forcibly driven in conjunction with each other, and even when the valve shafts 22 and 27 do not operate normally.
- the engine An abnormal state can be avoided.
- the spring force can be used as a combined force of the return panel forces of the springs 45 and 46 without increasing the return panel force of the panels 45 and 46 disposed on the valve shafts 22 and 27. Therefore, the valve shaft 22 and the valve shaft 27 can be forcibly and interlocked without increasing the operation force of the operation lever 29 shown in FIG. 2, and the valve shafts 22 and 27 do not operate normally. In some cases, an abnormal state of the engine can be avoided.
- FIGS. 6 and 7 are plan views of the conductive coupling mechanism according to the second embodiment.
- FIG. 6 shows a home position in which the leading air control valve and the air-fuel mixture throttle valve 21 are closed
- FIG. 7 shows a valve open state of the leading air control valve and the air-fuel mixture throttle valve 21.
- FIG. 6 can be set to the valve closed state
- FIG. 7 can be set to the home position state.
- the panel 46 ' has two functions as a tension panel and a twist panel.
- the projection 40 such as a hemispherical shape formed on the surface of the lever 23 on the cam plate 28 side comes into contact with the cam plate 28.
- the shape of the projection 40 can be a shape other than a hemispherical shape, such as a force cylinder shape.
- the protrusion 40 is not limited to a hemispherical shape or a semi-cylindrical shape, and can reduce the sliding resistance between the lever 23 and the cam plate 28, such as point contact and line contact, between them. Any shape, material, or the like can be used by appropriately combining those shapes and materials. Further, the projection 40 can be formed on the cam plate 28 side without being formed on the lever 23 side. Wear.
- the projecting amount of the valve shaft 27 can be reduced as compared with the first embodiment, so that the configuration area of the engine can be further reduced.
- the present invention provides a conduction coupling mechanism capable of interlockingly driving a leading air control valve shaft of a stratified scavenging two-cycle engine and an air-fuel mixture throttle valve shaft of a carburetor arranged at an angle.
- the technical idea of the present invention can be applied to an apparatus or the like to which the technical idea of the present invention can be applied.
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04818521A EP1683951B1 (en) | 2003-11-12 | 2004-11-12 | Transmissible connecting mechanism between valve shafts forming an angle |
US10/578,082 US7461631B2 (en) | 2003-11-12 | 2004-11-12 | Transmissible connecting mechanism between valve shafts forming angle |
DE602004028644T DE602004028644D1 (de) | 2003-11-12 | 2004-11-12 | Übertragungsverbindungssystem zwischen einen winkel bildenden ventilschäften |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-382615 | 2003-11-12 | ||
JP2003382615A JP4286636B2 (ja) | 2003-11-12 | 2003-11-12 | 角度を成す弁軸間の伝導結合機構 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005047672A1 true WO2005047672A1 (ja) | 2005-05-26 |
Family
ID=34587263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016863 WO2005047672A1 (ja) | 2003-11-12 | 2004-11-12 | 角度を成す弁軸間の伝導結合機構 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7461631B2 (ja) |
EP (1) | EP1683951B1 (ja) |
JP (1) | JP4286636B2 (ja) |
CN (1) | CN100473810C (ja) |
DE (1) | DE602004028644D1 (ja) |
WO (1) | WO2005047672A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016109079A (ja) * | 2014-12-09 | 2016-06-20 | 川崎重工業株式会社 | 乗物およびスロットル弁の駆動方法 |
US10138819B2 (en) | 2014-12-09 | 2018-11-27 | Kawasaki Jukogyo Kabushiki Kaisha | Vehicle, straddle-type vehicle, and method of driving throttle valve |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008047435A1 (fr) * | 2006-10-19 | 2008-04-24 | Husqvarna Zenoah Co.,Ltd. | Isolateur |
US7854216B2 (en) * | 2008-04-25 | 2010-12-21 | Honda Motor Co., Ltd. | General purpose internal combustion engine |
US9175601B2 (en) | 2012-01-04 | 2015-11-03 | Ini Power Systems, Inc. | Flex fuel field generator |
USD733052S1 (en) | 2012-12-20 | 2015-06-30 | Ini Power Systems, Inc. | Flexible fuel generator |
US9909534B2 (en) * | 2014-09-22 | 2018-03-06 | Ini Power Systems, Inc. | Carbureted engine having an adjustable fuel to air ratio |
USD827572S1 (en) | 2015-03-31 | 2018-09-04 | Ini Power Systems, Inc. | Flexible fuel generator |
US10030609B2 (en) | 2015-11-05 | 2018-07-24 | Ini Power Systems, Inc. | Thermal choke, autostart generator system, and method of use thereof |
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JP2000028009A (ja) * | 1998-07-08 | 2000-01-25 | Kubota Corp | 1つの操作軸による2軸回転装置 |
JP2000186559A (ja) * | 1998-12-24 | 2000-07-04 | Mitsubishi Heavy Ind Ltd | 層状掃気2サイクルエンジン |
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DE19918719B4 (de) * | 1999-04-24 | 2010-04-08 | Andreas Stihl Ag & Co. | Membranvergaser für einen mit Schichtspülung arbeitenden Zweitaktmotor |
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-
2003
- 2003-11-12 JP JP2003382615A patent/JP4286636B2/ja not_active Expired - Fee Related
-
2004
- 2004-11-12 CN CNB2004800333396A patent/CN100473810C/zh active Active
- 2004-11-12 US US10/578,082 patent/US7461631B2/en active Active
- 2004-11-12 WO PCT/JP2004/016863 patent/WO2005047672A1/ja active Application Filing
- 2004-11-12 DE DE602004028644T patent/DE602004028644D1/de active Active
- 2004-11-12 EP EP04818521A patent/EP1683951B1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000028009A (ja) * | 1998-07-08 | 2000-01-25 | Kubota Corp | 1つの操作軸による2軸回転装置 |
JP2000186559A (ja) * | 1998-12-24 | 2000-07-04 | Mitsubishi Heavy Ind Ltd | 層状掃気2サイクルエンジン |
Non-Patent Citations (2)
Title |
---|
See also references of EP1683951A4 * |
YOKOI T. ET AL.: "Yosetsu kikai kogaku", 25 February 1995, RIKOGAKUSHA, pages: 54, XP002987593 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016109079A (ja) * | 2014-12-09 | 2016-06-20 | 川崎重工業株式会社 | 乗物およびスロットル弁の駆動方法 |
US10138819B2 (en) | 2014-12-09 | 2018-11-27 | Kawasaki Jukogyo Kabushiki Kaisha | Vehicle, straddle-type vehicle, and method of driving throttle valve |
Also Published As
Publication number | Publication date |
---|---|
EP1683951A4 (en) | 2008-07-30 |
JP2005146916A (ja) | 2005-06-09 |
US20070107693A1 (en) | 2007-05-17 |
CN1878938A (zh) | 2006-12-13 |
EP1683951B1 (en) | 2010-08-11 |
EP1683951A1 (en) | 2006-07-26 |
DE602004028644D1 (de) | 2010-09-23 |
JP4286636B2 (ja) | 2009-07-01 |
CN100473810C (zh) | 2009-04-01 |
US7461631B2 (en) | 2008-12-09 |
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