Keihin Corporation

Kawasaki Jukogyo Kabushiki Kaisha

Kehin Corporation

Yasushi Kondo

Tetsuya Mori

Takashi Fukami

Hiroshi Kikuchi

Tomio Hirabayashi

Koji Mizusawa

Yu Yagishita

To reduce cost and size of a throttle valve control device, one endof a throttle valve shaftfixedly has a throttle valve leverenergized in valve opening direction by a throttle valve lever open spring, and rotatably has a drive gearconnected to a motor gear, a limp opening control leveris fixed at another endof a drum shaftaxially supported by a first cover, an accelerator drumenergized in valve closing direction by a drum close springis fixed at one end, a first opening directional end faceof the throttle valve leveris provided facing a limp opening control end face, and a second opening directional end faceof the throttle valve leveris provided facing a drive pinof the drive gear

Throttle valve control device

To make compact a motor actuator and a tandem valve type throttle body preferably for two-wheeled vehicles, a gear portion (G) and a motor (M) are arranged in an actuator case constituted by a gear case () and a motor case (), the gear portion (G) is formed by a motor gear (G), an intermediate gear (G) consisting of a small-diameter gear (G) and a large-diameter gear (G) in parallel, and an output gear (G), the motor (M) protrudes into the gear case () and is near the large-diameter gear (G), an actuator support boss () of a throttle body () is inserted into a throttle body insertion hole (i) a protruding end portion () of an auxiliary throttle valve shaft () is inserted into a connection hole (G), and a mounting boss () is screwed to the throttle body () via a mounting hole ().

Motor actuator and tandem valve type throttle body using the same

In order to protect a rotating portion of an intermediate link lever support pin, an intake air control apparatus provided with main and sub throttle valves is structured such that a wire bracket () supporting valve opening and closing wires (Wa, Wb) is screwed to an outer end surface () at a throttle drum side of a throttle body (), an intermediate link lever support pin () is provided toward the throttle body () side on an inner end surface () facing to the throttle body () of the wire bracket (), an intermediate link lever () rotatably borne to the intermediate link lever support pin () is arranged at the throttle body () side from the inner end surface (), and a rotating portion (R) of the intermediate link lever support pin () and the intermediate link lever () is arranged to face to the inner end surface ().

Intake air control apparatus for motor cycle

For easy and accurate assembly of a motor actuator with improvement of quality and productivity, a motor accommodating hole () continuously having a pressure insertion hole () and an insertion hole (), and a coupler () having terminals () are integrally formed in a motor case (), the insertion hole () is open to face to an opening () of the motor case (), the terminals () are arranged in parallel to a longitudinal axis (X-X) of the motor accommodating hole (), flat base plates () which are orthogonal to a longitudinal axis (Y-Y) of a motor () and have connection holes () are arranged in an outer periphery () of the motor (), the terminals () are inserted into the connection holes () when inserting the motor () into the insertion hole () and then the motor () is pressure-inserted fixedly to the pressure insertion hole ().

Motor actuator

To shorten a side mounting pitch of adjacent throttle bodies, in a multiple throttle body, thereby improving a mounting property to a two-wheeled vehicle, a discharge open hole () and a fuel spray escaping hole () are continuously provided toward a suction air passage () in a downstream side of a throttle valve (), longitudinal axes (X-X) of the respective throttle valve shafts () are coaxially arranged, a plurality of throttle bodies () are arranged in a side direction, an engine side mounting pipe sleeve () formed in an outer periphery of the downstream side suction air passage () including at least the fuel spray escaping hole () and the engine side end surface () is formed in an oval or an elliptic shape, and short axis portions () of the oval or the elliptic shape are arranged along the longitudinal axis (X-X).

Throttle body for two-wheeled vehicle

To improve an air bypass device in bypass air flow and designing freedom, a locking stepped parta bush inserting holeand a valve body drive mechanism inserting holeare provided above an upper endof a valve body guiding holeof an air control valve main bodyan air flow-in holeis provided below a lower endof the valve body guiding holeand an inner peripheral wallof the valve body guiding holeincludes a plurality of air control grooves. . . extending downwardly from the locking stepped partand being closed by an annular bushon the locking stepped partto form independent air distribution chambers. . . , which are connected to intake passages. . . at the downstream side from the respective throttle valves of multiple throttle bodies T. . . through bypass air passages

Air bypass device in multiple throttle body

Wire harness mounting structure for fuel distributor pipe comprises at least one pair of first and second guide claws provided on an outer periphery of the fuel distributor pipe with having a space along the longitudinal axis thereof, the first guide claw has a first wire harness support groove opened to one side, and the second guide claw has a second wire harness support groove opened to opposite side, the wire harness extending from the female type connector is inserted and retained in the first and second wire harness support grooves of the first and second guide claws, respectively, whereby additional mounting members for assembling is not required, and the assembling operation can be performed readily.

Wire harness mounting structure for fuel distributor pipe

To make a throttle valve control device compact, by reducing a longitudinal directional length H and a side directional length L of a gear part comprising a motor gear, an intermediate gear and a drive gear, so as to improve mountability on a two-wheeled vehicle, a drive gear Ka is provided at a throttle valve shaft, a motor gear Ma is provided at a motor M, the motor gear Ma is geared with a large diameter gear Nb of an intermediate gear Na, the drive gear Ka is geared with a small diameter gear Nc of the intermediate gear Na, the large diameter gear Nb of the intermediate gear Na is formed as an internal gear Nf, and the motor gear Ma is geared with the internal gear Nf which is the large diameter gear Nb.

To enhance assembling property of a throttle valve control device comprising a mechanical drive means and an electric drive means, and to enhance maintenance property at the time of checking and exchange operations of an accelerator wire, the electric drive means and the mechanical drive means are provided at an one side wallof a throttle bodytoward the one side wallside from the one side direction A, the electric drive means comprises throttle valve leverincluding a throttle valve lever open springa motor gearand a drive gearincluding an intermediate gearand the mechanical drive means comprises a limb opening control leverand an accelerator drumincluding a drum close spring

To make a length in a horizontal direction of a vapor return joint small, thereby improving an assembling property of a fuel flow path module to a fuel tank, a vapor inflow hole, a fuel outflow hole and a regulator fuel inflow hole are provided in a fuel tube portion of a fuel flow path module, a vapor return joint is provided uprightly in an upper side of the vapor inflow hole, the vapor return joint comprises by a first straight pipe portion, and a second straight pipe portion connected to an upper end of the first straight pipe portion at a narrow angle A downward, an intersection between the first straight pipe portion and the second straight pipe portion is arranged above an upper opening end of the second straight pipe portion.

Fuel flow path module in inline pump type fuel injection apparatus

A throttle body configured to supply air to an air-intake port of an engine is disclosed. The throttle body typically includes an air-intake passage through which air flows. The air-intake passage at least partially has a non-perfect circle portion with a cross-section of a non-perfect circle shape in a direction substantially perpendicular to a direction of an air flow of air taken in from outside. The non-perfect circle shape typically has long and short axes. At least one of a first throttle valve and a second throttle valve typically is mounted within the non-perfect circle portion of the air-intake passage. The first throttle valve and second throttle valve may include throttle valve members each having a shape conforming to the non-perfect circle shape of the cross-section of the non-perfect circle portion of the air-intake passage. Typically, the first throttle valve and the second throttle valve are each configured to control an amount of the air flow. At least one of the first throttle valve and the second throttle valve is configured to open and close to substantially open and close the air-intake passage.

Throttle body and engine of motorcycle having throttle body

To improve layout freedom, waterproof and dustproof, a lower cup opening upward side is integrally formed with a throttle body and an upper cup covers the lower cup to form a chamber, a fuel injection valve is fixed to throttle body by a fuel distribution pipe, the fuel injection valve, the fuel distribution pipe and a female type connector fitted to an external connecting connector of the fuel injection valve are arranged within the chamber, a takeout groove is formed in a side wall of the upper cup toward a lower attaching collar portion, and a fuel introduction pipe connected to the fuel distribution pipe and a lead wire connected to the female type connector are drawn out to the external via the takeout groove.

Throttle body in fuel injection apparatus

To make a motor to control throttle valve opening degree compact and reduce electricity consumption, a throttle valve lever () attached to a throttle valve shaft () has a roller () and an operating arm portion (), a loosely fitted lever () is arranged to the throttle valve shaft (), the operating arm portion () is arranged in a gap (S) between first and second locking portions () of the loosely fitted lever (), a cam surface () of a cam lever () connected to an output shaft (Ma) of a lead screw type step motor (M) faces to the roller (), a throttle valve operating drum () is coupled to the loosely fitted lever () via a link cover () and, when the motor (M) is driven, the cam lever () rotates the throttle valve lever () and the arm portion () rotates within the gap (S) to hold an idling opening degree.

Idling opening degree control apparatus in intake air control apparatus

An idle speed control apparatus which improves freedom of selection in an opening degree characteristic of a throttle valve is structured such that an intake passage of a throttle body is opened and closed by a throttle valve, a cam lever is attached to one end of a rotatably supported link shaft, a link lever is attached to another end of the link shaft, a slider of a stepping motor is connected to the link lever, a cam portion of the cam lever is connected to a roller of the throttle valve lever, linear motion of the slider is transmitted to the link shaft via the link lever to rotationally displace the link shaft, rotation of the cam lever is transmitted to the throttle valve lever, and the throttle valve opens an idling opening degree corresponding to the rotation of the stepping motor.

Idle speed control apparatus in throttle body

To provides a lead screw type stepping motor which is excellent in a response and controllability and can carry out an accurate initial alignment, a rotor ( ) is rotatably supported inside of a stator ( ) around which an exciting coil ( A) is wound, a female threaded hole ( A) is provided in the center of the rotor ( ), a slider ( ) is arranged to be engaged with the female threaded hole ( A), a slit groove ( C) shaped in an oblong hole is pierced through in the slider ( ), which is movably arranged in a guide hole ( B) of a case ( ), a guide pin ( ) is arranged to be inserted into the slit groove ( C), and both ends of the guide pin ( ) are press inserted and fixed to a bearing portion ( A) in which the guide hole ( B) is provided.

Growing community of inventors

Kawasaki, Japan

Yasushi Kondo