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81. 发明专利

JP2001342837A STRATIFIED SCAVENGING TWO-CYCLE ENGINE 失效
公开(公告)号：JP2001342837A
公开(公告)日：2001-12-14
申请号：JP2000167080
申请日：2000-06-05
申请人： ZAMA JAPAN CO LTD
发明人： KOIZUMI KIMIO , ARAKI SATORU
IPC分类号： F02B33/04 , F02B25/16 , F02B25/20 , F02B25/22 , F02B33/44 , F02B75/02 , F02D9/02 , F02D9/14 , F02M9/06 , F02M9/08 , F02M11/08
摘要： PROBLEM TO BE SOLVED: To correspond to a case that a set space is extremely restricted by miniaturizing a flow controlling means comprising a throttle valve for output control and an air valve for controlling scavenging air flow and shortening a mixture passage and an air passage. SOLUTION: The throttle valve 22 of the mixture passage 6 connected to a crank chamber 3 and the air valve 25 of the air passage 9 connected to a scavenging passage 8 are integrally formed by engaging one cylindrical valve element 27 having a throttle through hole 23 and an air through hole 26 with one body 28. The mixture passage 6 is straight in the body 28, the air passage 9 is directed obliquely upward on the downstream side of the valve element 27, and the upstream sides of the valve element 27 of the passages 6 and 9 are formed with one common inlet passage 30.

82. 发明专利

JP2001329845A STRATIFIED SCAVENGE TWO-CYCLE ENGINE 失效
公开(公告)号：JP2001329845A
公开(公告)日：2001-11-30
申请号：JP2000152566
申请日：2000-05-24
申请人： ZAMA JAPAN CO LTD
发明人： KOIZUMI KIMIO , ARAKI SATORU
IPC分类号： F02B25/22 , F02B75/02 , F02D9/02
摘要： PROBLEM TO BE SOLVED: To easily and properly set the opening start timing of an air valve for controlling the scavenge air flow to an output control throttle valve according to the operation state and characteristic of an engine. SOLUTION: The throttle valve 21 and the air valve 25 are separately and coaxially installed at adjacent positions on an air-fuel mixture passage 6 connected to a crankcase 3 and an air passage 9 connected to a scavenge passage 8 so that the air valve 25 starts to be opened by an interlocking mechanism 51 after the throttle valve 21 at an optional delay set by a valve closing position adjusting mechanism 51 when the throttle valve 21 is opened. Their stability, certainty, and performance can be improved by feeding only the air-fuel mixture from the air-fuel mixture passage 6 at idling, a low-temperature start, and an initial stage of acceleration, and the optimum air valve opening start timing corresponding to the characteristic of the engine can be set.

83. 发明专利

JP2001295652A STRATIFIED SCAVENGING TWO-CYCLE ENGINE 失效
公开(公告)号：JP2001295652A
公开(公告)日：2001-10-26
申请号：JP2000111725
申请日：2000-04-13
申请人： ZAMA JAPAN CO LTD
发明人： KOIZUMI KIMIO
IPC分类号： F02M9/12 , F02B25/20 , F02B25/22 , F02B29/06 , F02B75/02 , F02D9/02 , F02D9/10 , F02M13/04
摘要： PROBLEM TO BE SOLVED: To simplify the structure, reduce the size, and facilitate the opening control of a throttle valve in a mixture path and an air valve in an air path. SOLUTION: Spaces, formed through a partition wall 15 and adjacent to each other, are provided in a mixture path connected to a crankcase 3 and an air path 9 connected to a scavenging path 8, and a valve stem 25 is installed on generally the same level as the partition wall 15 to operate a butterfly valve 24, so that one side thereof through the valve stem 25 of a valve plate 26 acts as a throttle valve 27 and the other acts as an air valve 28. The opening control of the throttle valve 27 and the air valve 28 are performed by the single operation of the butterfly valve 24, so that the flow rate ratio becomes a specified fixed value.

84. 发明专利

JP2001263171A CARBURETOR FOR GENERAL PURPOSE ENGINE 失效
公开(公告)号：JP2001263171A
公开(公告)日：2001-09-26
申请号：JP2000081172
申请日：2000-03-23
申请人： ZAMA JAPAN CO LTD
发明人： KOIZUMI KIMIO
IPC分类号： F02M3/12
摘要： PROBLEM TO BE SOLVED: To eliminate an inconvenience causing an engine stall and an idle failure by inflow and accumulation of fuel by an attitude change at the time of a normal driving in an auxiliary passage for supplying air-fuel mixture for starting and outflow of fuel by the next attitude change. SOLUTION: In this carburetor in which an opening/closing valve 31 interlocking with a throttle valve 4 is provided in the auxiliary passage 21 connected with a downstream side of the throttle valve 4 of an intake passage 2, the opening/closing valve 31 is opened at the time of idle opening of the throttle valve 4 and replenishes air-fuel mixture to the engine and the auxiliary passage 21 is closed because the opening/closing valve 31 is closed when the throttle valve 4 is opened, a downstream side part of the opening/closing valve 31 of the auxiliary passage 21 is communicated with an upstream side part of the throttle valve 4 of the intake passage 2 by an air passage 28 and fuel is prevented from flowing into the auxiliary passage 21 by air from the air passage 28 when the opening/closing valve 31 is closed.

85. 发明专利

JP2000303907A CARBURETOR 失效
公开(公告)号：JP2000303907A
公开(公告)日：2000-10-31
申请号：JP11335299
申请日：1999-04-21
申请人： ZAMA JAPAN CO LTD
发明人： ARAKI SATORU
IPC分类号： F02M3/09 , F02M7/06 , F02M17/04
摘要： PROBLEM TO BE SOLVED: To provide a carburetor with a fuel feed function for acceleration being simple in structure not using an acceleration pump. SOLUTION: An air passage 35 crossing a throttle valve stem 8 is connected to a throw port chamber 28 and an air introduction passage 38 communicated in a throttle valve high opening area with the air inlet side of an air passage 35 and the throw port chamber side and cutting off other than the above is situated on a throttle valve stem 8. This constitution feeds fuel in the throw port chamber 28 to an air intake passage 2 through suction operation of a negative pressure in a suction pipe and push operation of air and forms fuel for acceleration.

86. 发明专利

JP2000018099A ROTARY THROTTLE VALVE TYPE CARBURETOR 失效
公开(公告)号：JP2000018099A
公开(公告)日：2000-01-18
申请号：JP20433098
申请日：1998-07-03
申请人： ZAMA JAPAN CO LTD
发明人： YANAKA NOBORU
IPC分类号： F02M1/02 , F02M9/08 , F02M19/06
摘要： PROBLEM TO BE SOLVED: To reduce the individual machining accuracy of a metering pin setting a minimum flow rate at the time of idling and a fixed jet setting a maximum flow rate at the time of full-load and simultaneously to make engine drivability better than over. SOLUTION: A choke valve 22 is installed in the inlet of an intake passage 2 while a check valve 21 to be closed toward a constant fuel chamber 18 is installed in a fuel passage 19, connecting an air bleed passage 24 to the downstream side of the check valve 21 of the fuel passage 19, and any negative pressure acting on the fuel passage 19 and a fuel nozzle 16 is lowered by the induction of bleed air, and further both dimensional accuracies of a metering pin 7 and a fixed jet 20 relaxed. Fuel is evacuated from the air bleed passage 24 in time of cold starting, improving the startability, and further a jet diameter of the fixed jet 20 is enlargeable, whereby a fuel flow rate at the time of full- load driving is secured.

87. 发明专利

JPH11125146A ACCELERATOR OF ROTARY THROTTLE VALVE TYPE CARBURETOR 失效
公开(公告)号：JPH11125146A
公开(公告)日：1999-05-11
申请号：JP30805297
申请日：1997-10-22
申请人： ZAMA JAPAN CO LTD
发明人： ARAKI SATORU
IPC分类号： F02M9/08
摘要： PROBLEM TO BE SOLVED: To supply a sufficient quantity of accelerating fuel by forming a pump chamber longitudinally crossing part of a piston rod as a small diameter rod part, and protrusively arranging an accelerating arm in a large diameter rod part by forming an inserting part of a carburetor main body as the large diameter rod part. SOLUTION: A piston rod 24 whose one end is fixed/joined to a piston 23 is composed of a small diameter rod part 24a and a large diameter rod part 24b. Among these, the small diameter rod part 24a projects in a space 19 by longitudinally crossing a pump chamber 25 on the opposite side of a constant fuel chamber 17 by sandwiching the piston 23 of a cylinder chamber 22. While, the small diameter rod part 24a is loosely inserted into the large diameter rod part 24b, and an accelerating arm 28 is fixed/joined to an end part projecting in the space 19 by projecting it in the perpendicular direction. At time of acceleration, the accelerating arm 28 contacted/engaged with a throttle valve 4 moves the piston 23 in the volume reducing direction of the pump chamber 25 by pulling the piston rod 24. At this time, the small diameter rod part 24a longitudinally crosses the pump chamber 25, and since the maximum volume becomes larger than usual, accelerating fuel sent out of the pump chamber 25 increases.

88. 发明专利

JPH11117812A CARBURETOR PROVIDED WITH STARTING MECHANISM 失效
公开(公告)号：JPH11117812A
公开(公告)日：1999-04-27
申请号：JP29327597
申请日：1997-10-09
申请人： ZAMA JAPAN CO LTD
发明人： NONAKA TAKUMI
IPC分类号： F02M1/04 , F02M1/08 , F02M17/04
摘要： PROBLEM TO BE SOLVED: To allow a carburetor provided with a starting mechanism to select various starting operation methods, wherein the starting mechanism comprises an auxiliary passage for supplying a starting mixture and a switch valve for the passage. SOLUTION: In a carburetor, a first throttle valve lever 42 to be turned by an acceleration operation is freely pivoted on a throttle valve shaft 41. A second throttle valve lever 43 connected via the lever 42 and a torsion coil spring 46 is fixed to the throttle valve shaft 41. In closing a switch valve 25 of an auxiliary passage 21, the two levers 42, 43 are turned integrally with each other so as to switch a throttle valve 3. An idle holding means 38 fixes the second throttle valve lever 43 at the opening position of the switch valve 25, thereby preventing the throttle valve 3 from being opened by idle turning of the first throttle lever 42.

89. 发明专利

JPH10274100A ROTARY RESTRICTION VALVE TYPE CARBURETOR 失效
公开(公告)号：JPH10274100A
公开(公告)日：1998-10-13
申请号：JP9660897
申请日：1997-03-31
申请人： ZAMA JAPAN CO LTD
发明人： ARAKI SATORU
IPC分类号： F02M9/08 , F02M19/04
摘要： PROBLEM TO BE SOLVED: To facilitate regulation of an idling position of measuring needle for controlling a rate of fuel which flows from a fuel nozzle. SOLUTION: A regulating screw 17 is screwed around a screw hole 15 of a restriction valve shaft 8 for rotating a cylindrical restriction valve 4, and is connected to a regulating part piece 19 by a screw having a pitch which is different from the pitch of the regulating screw 17. A measuring needle 7 is integratedly moved in a center axial direction freely to move the regulating part piece 19 in the center axial direction and to prevent rotation of the regulating part piece 19. When the regulating screw 17 is rotated, the regulating part piece 19 is displaced for a distance corresponding to a difference between pitches, and the position of the measuring needle 7 is finely regulated if the regulating screw 17 is rotated largely.

90. 发明专利

JPH10131808A CARBURETTER OF ROTARY THROTTLE VALVE TYPE 失效
公开(公告)号：JPH10131808A
公开(公告)日：1998-05-19
申请号：JP30358996
申请日：1996-10-29
申请人： ZAMA JAPAN CO LTD
发明人： ARAKI SATORU
IPC分类号： F02M1/00 , F02M1/16 , F02M9/06 , F02M9/08 , F02M13/04 , F02M17/04 , F02M17/36 , F02M17/40 , F02M33/04
摘要： PROBLEM TO BE SOLVED: To ensure start of an engine at low temp. while retaining a throttle valve at the increasing position of air and fuel with a simple operation. SOLUTION: A level 11 transmitting an accelerator action to a throttle valve 4 is turned from idle position by means of a cam piece 22 and is simultaneously moved to the direction of axial line so that the degree of overrupping of a throttle through hole 5 with an intake passage 2 is made slightly large, and the insertion depth of a measurement needle 7 into a fuel nozzle 15 is made slightly low, thereby increasing the quantity of air and fuel which are required for the start-up at low temp. The cam piece 22 is engaged with a lever 11 and fixed at a working position, and is returned to unworking position by a spring 23 when the lever 11 is disengaged therefrom by the accelerator action.

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