Patents Assigned to Zama Japan Kabushiki Kaisha
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Patent number: 11614054Abstract: An improved rotary type carburetor for a stratified scavenging engine designed to enable the easy adjustment of air and fuel flow at the time of initial configuration is disclosed. The improved rotary carburetor includes an air intake passage and an air-fuel mixture passage formed in a horizontal direction on a carburetor main body. The throttle valve of the improved rotary carburetor can be fitted into a cylindrical-throttle-valve hole formed orthogonal to a fuel and an air passage of the carburetor main body. The throttle valve has the air supply side valve hole formed on the air intake passage side and a fuel supply side valve hole formed on the air-fuel mixture passage side.Type: GrantFiled: December 28, 2020Date of Patent: March 28, 2023Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Takahashi, Mineyuki Tamura, Hideki Sasaki, Hiroki Sato
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Patent number: 11408384Abstract: Disclosed are example embodiments of a fuel injection device having a plunger that moves at a predetermined reciprocating motion from an initial position, the fuel injection device includes: an electromagnetic coil; a tubular bobbin within the electromagnetic coil, wherein the electromagnetic coil is configured to move the tubular bobbin when energized; a fuel intake channel; and an inlet check valve disposed along a fuel pathway of the fuel intake channel, the inlet check valve configured to allow fuel to flow through and to a pressurization chamber, wherein the inlet check valve is a normally open valve.Type: GrantFiled: April 20, 2021Date of Patent: August 9, 2022Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Boris Matuschka
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Patent number: 11236704Abstract: An improved primary pump for a carburetor is provided. The primary pump has a reduced cost and reduced space construction. The primary pump includes: a flexible cap having a cavity; an inlet open to the cavity of the flexible cap; an inlet side path fluidly coupled to the inlet; an inlet side check valve disposed in the inlet side path; an outlet open to the cavity of the flexible cap; an outlet side path fluidly coupled to the outlet; and an outlet side check valve disposed on the outlet side path, wherein at least one among the inlet side check valve and the outlet side check valve comprises a flap formed in a pump diaphragm of a fuel pump of the carburetor.Type: GrantFiled: July 30, 2020Date of Patent: February 1, 2022Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Hiroyuki Oka, Kazunori Tabata, Toshiyuki Kuyo
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Patent number: 10669972Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator and having a main fuel jet and nozzle assembly with a main fuel jet releasably coupled to the body of the carburetor. Alternatively, a main fuel jet and nozzle assembly includes a nozzle and check valve retainer formed as a single component. In other embodiments, a carburetor is provided having a fuel pump and fuel pressure regulator positioned on the same side of the body. A fuel pump and metering chamber diaphragm sandwiched between the body of the carburetor and a pump body and cover, separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator.Type: GrantFiled: January 17, 2018Date of Patent: June 2, 2020Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 10655556Abstract: A fuel injection device comprising electricity-generating means generating electricity by rotation of an engine and outputting a predetermined signal, and a solenoid valve injecting fuel; the valve being opened as a result of a drive current applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation of the engine; to ensure that the flow rate required during high-speed operation ca be adequately provided in a fuel injection device for injecting/supplying fuel to an engine. The electricity-generating means is an alternating current generation means attached to the engine in a crank angle position at which an output is generated in synchronization with the intake timing of the engine; the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed.Type: GrantFiled: October 16, 2018Date of Patent: May 19, 2020Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe
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Patent number: 10634096Abstract: A check valve that can prevent sticking of a valve body and reliably perform an opening and closing action in a check vale having a simple structure and that does not use biasing means on the valve body. A check valve has support pieces of a valve body protruding in the valve body direction on a circular base seat forming an outflow window in the center inserted in a circular groove where a support member (retainer) is formed between an outflow opening and a valve seat and on an open edge of the outflow window formed in the center of the base seat, and the support pieces of the support member (retainer) that support the valve body have linear or planar support parts on the top portion for leveling at least in a radial direction of the base seat.Type: GrantFiled: August 8, 2018Date of Patent: April 28, 2020Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Hideki Sasaki
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Patent number: 10495029Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.Type: GrantFiled: March 5, 2018Date of Patent: December 3, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 10273917Abstract: A fuel injection device for smooth discharge of a gas accumulated therein comprising a fuel pump, a solenoid valve for injecting pressurized fuel into the intake passage of an engine, a high-pressure fuel passage extending from the fuel pump to the solenoid valve and has a medially positioned constant-pressure chamber, and a fuel return passage connected to a fuel return pipe, with the fuel return passage extending from the constant-pressure chamber and having a medially positioned priming pump. The constant-pressure chamber is configured with the top wall in the upper space thereof disposed above the opening of the high-pressure fuel passage opposite the solenoid valve, the fuel return passage opens into the upper space at a position above the opening of the high-pressure fuel passage, and the gas accumulating in the constant-pressure chamber is discharged from the upper space toward the fuel tank via the fuel return passage.Type: GrantFiled: November 13, 2017Date of Patent: April 30, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe
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Patent number: 10267266Abstract: An attachment structure for a solenoid valve which can be stably attached to and removed from a carburetor unit with a single movement and without increasing the number of parts. A rod-like supporting portion is disposed a predetermined distance away from a surface of a carburetor unit and extending in a direction substantially perpendicular to a direction of and installed near an opening in the surface of the carburetor unit. A cylindrical engaging portion extends from a circumferential face of a cylindrical body fitted on the solenoid valve substantially perpendicular to an axial line of the rod-like supporting portion, and forms a groove-like engagement portion which is narrower in diameter than the rod-like supporting portion, whereby the engaging portion, via the groove-like engagement portion, is coupled to and supported by rod-like supporting portion when an insertion portion of the solenoid valve is inserted into the opening.Type: GrantFiled: February 21, 2017Date of Patent: April 23, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe, Hiroyuki Oka
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Patent number: 10227953Abstract: A starting device for feeding a quantity of fuel from the fixed-quantity fuel chamber to an intake passage during start-up having a manually operated primary pump for suctioning/pumping fuel and arranged on a fuel introduction path connected along a fuel-feeding path; and a fixed-quantity fuel chamber for temporarily storing fuel delivered from the primary pump. An internal wall of the fixed-quantity fuel chamber undergoes elastic displacement, allowing its internal capacity to expand/shrink within a predetermined range; the fixed-quantity fuel chamber is connected to a fuel delivery path that communicates with the intake passage side and has a manually operated open/close valve; the valve is opened in a state in which, due to the primary pump being operated, the fixed-quantity fuel chamber is filled with a predetermined quantity of fuel while enlarging its internal capacity, whereby it shrinks due to an elastic contraction force and the fuel.Type: GrantFiled: October 20, 2015Date of Patent: March 12, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Hideki Watanabe, Tamotsu Saito
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Patent number: 10202943Abstract: An adjustment device for a carburetor adjustment valve includes a limit cap and a sleeve to prevent over-operation and destruction. The limit cap having first and second projecting parts formed in the insertion hole. The first projecting part engages a first groove on the shaft part of the adjustment valve to hold the limit cap in a first position where the limit cap and adjustment valve rotate freely relative to the sleeve. The second projecting part holds the limit cap in a second position pushed in from the first position where the adjustment valve having a limited range of rotation. The limit cap has an outer circumferential locking part formed on the outer circumference and the sleeve has an inner circumferential locking part formed on its inner circumference. In the second position, the inner circumferential locking part locks the outer circumferential locking part and prevents rotation of the limit cap.Type: GrantFiled: May 26, 2017Date of Patent: February 12, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Daisuke Suzuki
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Patent number: 10161298Abstract: A carburetor for a two-stroke internal combustion engine whereby airtightness is maintained and intake of uncombusted fuel into an air path is prevented. The carburetor includes a circular cylindrical valve hole and a rotary valve fitted into the valve hole such that it can rotate and is disposed perpendicularly across a fuel intake path and an air intake path which are formed substantially parallel with respect to each other, and a fuel supply-side bore which controls the flow rate along the fuel intake path and the air supply-side bore which controls the air capacity along the air path pass through part of the cylindrical portion perpendicularly to the axial direction of the rotary valve, and annular recesses formed in part of a circumferential wall of an outer circumference of the rotary valve so as not to correspond to at least the fuel supply-side bore and the air supply-side bore.Type: GrantFiled: June 14, 2017Date of Patent: December 25, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Mineyuki Tamura
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Patent number: 10132265Abstract: A fuel injection device comprising electricity-generating means generating electricity by rotation of an engine and outputting a predetermined signal, and a solenoid valve injecting fuel; the valve being opened as a result of a drive current applied to a coil, and the fuel being injected into an intake passage of the engine at a predetermined timing during the rotation of the engine; to ensure that the flow rate required during high-speed operation ca be adequately provided in a fuel injection device for injecting/supplying fuel to an engine. The electricity-generating means is an alternating current generation means attached to the engine in a crank angle position at which an output is generated in synchronization with the intake timing of the engine; the signal is an injection command signal applied to the solenoid valve as an alternating-current drive current; and the applied voltage increases with increased engine speed.Type: GrantFiled: January 5, 2017Date of Patent: November 20, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: Takumi Nonaka, Hideki Watanabe
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Patent number: 10072616Abstract: A check valve that can prevent sticking of a valve body and reliably perform an opening and closing action in a check vale having a simple structure and that does not use biasing means on the valve body. A check valve has support pieces of a valve body protruding in the valve body direction on a circular base seat forming an outflow window in the center inserted in a circular groove where a support member (retainer) is formed between an outflow opening and a valve seat and on an open edge of the outflow window formed in the center of the base seat, and the support pieces of the support member (retainer) that support the valve body have linear or planar support parts on the top portion for leveling at least in a radial direction of the base seat.Type: GrantFiled: July 20, 2017Date of Patent: September 11, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Hideki Sasaki
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Patent number: 9938932Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator. The fuel pump and fuel pressure regulator are positioned on the same side of the body. A fuel pump and metering chamber diaphragm is sandwiched between the body of the carburetor and a pump body and cover. The diaphragm separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator. Inlet and outlet flapper valves are part of the diaphragm or a separate flapper valve member positioned between the body and the diaphragm.Type: GrantFiled: February 16, 2016Date of Patent: April 10, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: 9897042Abstract: A carburetor includes a body with an air intake path, a fuel pump and a fuel pressure regulator and having a main fuel jet and nozzle assembly with a main fuel jet releasably coupled to the body of the carburetor. Alternatively, a main fuel jet and nozzle assembly includes a nozzle and check valve retainer formed as a single component. In other embodiments, a carburetor is provided having a fuel pump and fuel pressure regulator positioned on the same side of the body. A fuel pump and metering chamber diaphragm sandwiched between the body of the carburetor and a pump body and cover, separates a pump chamber from a pulse chamber of the fuel pump and separates a fuel chamber from an air chamber in the fuel pressure regulator.Type: GrantFiled: February 16, 2016Date of Patent: February 20, 2018Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventors: David R. Shebuski, Toshiyuki Kuyo, Takumi Nonaka, Jay A. Perry
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Patent number: D840201Type: GrantFiled: January 30, 2017Date of Patent: February 12, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Mamoru Toda
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Patent number: D848486Type: GrantFiled: January 30, 2017Date of Patent: May 14, 2019Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Mineyuki Tamura
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Patent number: D877582Type: GrantFiled: January 30, 2017Date of Patent: March 10, 2020Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Mineyuki Tamura
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Patent number: D919665Type: GrantFiled: January 30, 2017Date of Patent: May 18, 2021Assignee: ZAMA JAPAN KABUSHIKI KAISHAInventor: Mamoru Toda