Keihin Corporation

Yoichi Yanagii

Masahiro Toriumi

To improve maintenance workability of fuel injection valves in multiple throttle bodies, a distribution member (D) is provided with a fuel distribution path () communicating with a fuel inflow path (), throttle body mounting holes () and injection valve support member mounting holes (), injection valve support members (S, S) are provided with injection valve support bosses (), the distribution member (D) is screwed to the one and other side throttle bodies (T, T) via the throttle body mounting holes (), the other side end surfaces () of the injection valve support members (S, S) are screwed on one and the other side end surfaces () of the distribution member (D), and the other and one side fuel injection valves (Ja, Jb) are held by the injection valve support members (S, S) and the other and one side throttle body (T, T) respectively.

Fuel distribution pipe structure in multiple throttle body

To easily carry out change pulling directions of opening and closing wires in a link type throttle valve control device, a throttle valve operation dramand a first link leverare mounted at a throttle valve operation shaft, the throttle valve operation dramhas opening and closing valve end inserting holes, the throttle valve operation shaftis rotatably provided at a stay platehaving first and second cable guide inserting holes, and rotatably provided coaxially with a throttle valve shaft, first and second link leversmounted at the throttle valve shaftare linked by a connection lever, the stay plateis rotated to a desired position around the throttle valve shaft, and in this state, the stay plateis fixed at a throttle bodyby screws

Link type throttle valve control device in throttle body

To provide an accelerator opening degree detecting apparatus for a two-wheeled vehicle, which is not damaged even if the two-wheeled vehicle takes a fall, and is excellent in waterproofness and weather resistance, a rotating shaft () is rotatably supported to a fixed member (), an accelerator opening degree sensor () is arranged in one end () of the rotating shaft (), a rotating drum () is arranged in the other end (), the rotating drum () and an accelerator grip () are coupled by a coupling member (), and the accelerator grip () and the rotating drum () are synchronously rotated.

Accelerator opening degree detecting apparatus in throttle control apparatus for two-wheeled vehicle

To improve freedom of mounting to a motor cycle, a tandem valve type throttle body is provided with a throttle valve () in the downstream side of an intake passage () and a sub throttle valve () in the upstream side thereof, a sub throttle valve shaft () is rotated by a motor (M), a sub throttle valve lever () and a throttle valve lever () are connected by a transmission member, the shaft () and a sensor rotor (TA) of an opening degree sensor (T) are energized in the opening direction of the shaft () by a rotor spring (TC), a link lever spring () pressing the transmission member () in one direction is energized in the closing direction of the valve (), and torque is set so as to cancel spring forces applied to the shaft () by both the springs (TC), ().

Tandem valve type throttle body

To reduce the number of the fuel distribution pipes and fuel joints to make the cost for them inexpensive, a fuel distribution pipe is provided with a fuel distribution passage with one end being opened by a fuel introduction hole, a plurality of injection valve insertion holes positioned apart from a longitudinal axial line of the fuel distribution passage toward one side by a predetermined amount, having longitudinal axial lines thereof crossing orthogonally to the longitudinal axial line, and having a leading end open toward one side a plurality of mounting bosses formed orthogonally to a cross section including the longitudinal axial lines and, and each having an upper end surfaces and a lower end surfaces uniformly protruding upward and, downward a predetermined amount from the longitudinal axial line, and mounting holes provided in the mounting bosses apart from the longitudinal axial line toward one side by a predetermined amount, at least two fuel distribution pipes being prepared, the fuel introduction holes being arranged to be opposed to each other, and the longitudinal axial line being concentrically arranged, whereby the injection valve insertion holes and the mounting holes are arranged in the same direction at the same position.

Fuel distribution pipe in fuel injection apparatus

To provides a throttle valve control apparatus which can stably detect an angle of a throttle valve shaft for a long time with no hysteresis in detecting an angle of the throttle valve shaft, and can make a motor for driving the throttle valve shaft compact, an intake passage is controlled to be opened and closed by a throttle valve mounted to a throttle valve shaft a spring force in a direction for closing of the throttle valve is energized to the throttle valve shaft by a throttle return spring the throttle valve shaft is operated to be opened and closed by a motor M driven according to a signal output from an ECU, a rotation angle of the throttle valve shaft is detected by an opening degree sensor T arranged to face to the throttle valve shaft this angle signal is output toward the ECU, and a sensor rotor TA constituting the opening degree sensor is pressed and energized to an end portion of the throttle valve shaft in a rotation direction of the throttle valve by a rotor return spring which energizes the sensor rotor in a direction for opening of the throttle valve

Throttle valve control apparatus in internal combustion engine

To provide a tandem valve type throttle body in which a closing direction of a second throttle valve is not restricted to one side, can an intake efficiency can be improved, and an entire length of a throttle body can be reduced, a butterfly type first throttle valve ( ) is attached to a first throttle valve shaft ( ) and operated by an accelerator, a butterfly type second throttle valve ( ) is disposed in an upstream side of the first throttle valve ( ) and attached to a second throttle valve shaft ( ), the second throttle valve ( ) is formed in an always open type and operated so as to be closed by an electromagnetic actuator, an axial pitch (P) between the first throttle valve shaft ( ) and the second throttle valve shaft ( ) is twice a radius (R) of the throttle valve ( ) or less, and a notch portion ( B) is formed in the second throttle valve ( ) in correspondence to an interference portion on planes of both the throttle valves ( ) at a time of fully opening both the throttle valves ( ).

A vacuum actuated valve for a constant vacuum type carburetor is formed with a first guide hole, a jet needle engaging step portion and a jet needle insertion hole therein. A spring seat has an outer cylindrical portion in an upper portion thereof, and an inner cylindrical portion and a jet needle supporting cylindrical portion therein. The outer cylindrical portion of the spring seat is arranged on the outer circumference of a diaphragm plate. The jet needle supporting cylindrical portion is inserted within a first guide hole. A lower end of a vacuum actuated valve return spring engages with a spring seating flange of the spring seat. A flange portion of a jet needle is restricted by the jet needle engaging step portion and the jet needle supporting cylindrical portion.

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Kawasaki, Japan

Yoichi Yanagii