A throttle drive actuator for an engine includes a rotor and a stator. The rotor connects with a valve of a throttle body to rotate the valve, to open a close an air passage of the throttle body of the engine.

A transmission mechanism includes: an intermediate shaft secured to a support portion provided in a valve body of an electric throttle valve and disposed in parallel to a motor shaft and a valve shaft; and an intermediate gear rotatably disposed at the intermediate shaft, in which the intermediate gear has a first intermediate gear engaged with a motor gear secured to the motor shaft and a second intermediate gear engaged with a valve gear secured to the valve shaft, the first intermediate gear and the second intermediate gear are integrally configured to be aligned in an axial direction of the intermediate shaft, a hemispherical recessed portion recessed upward around an axial center of the intermediate shaft is formed at a lower end portion of the intermediate gear, and a projecting portion projecting upward in a hemispherical shape around the axial center of the intermediate shaft and supporting the recessed portion is formed in a surface of the support portion facing the recessed portion of the intermediate gear.

The engine shut-off valve system includes a housing, a gate member, a rotating lever, a locking piston assembly, and a closing piston assembly. The system is installed in fluid connection with a flow line so that air flow passes through a passageway in the housing with the gate member in the locked configuration. The air flow through the passageway stops with the gate member in the closed configuration. The gate member has an asymmetry so that the forces of the spring of the closing piston assembly and the spring of the locking piston assembly are cooperative to actuate between the closed configuration and the locked configuration, while wearing on the gate member differently so as to extend the working life of the valve system. The closing piston assembly and the locking piston assembly are separately accessible for maintenance.

An intake duct that includes a first flange projecting outward from an edge of the intake duct on a throttle body side. An intake manifold that includes a second flange projecting outward from an edge of the intake manifold on a throttle body side. A plurality of spacers is provided between the first flange and the second flange around the throttle body. The first flange and the second flange are fastened via the plurality of spacers in a state where the throttle body is held between the intake duct and the intake manifold.

An intake device is provided with a throttle body having a valve that can rotate relative to a body, and an intake pipe provided downstream of the throttle body and connected to an internal combustion engine, an intake passage of the intake pipe being provided with a flow adjustment part that guides the air supplied from the throttle body in the direction in which the intake passage extends, and the flow adjustment part being provided to an upstream end that is on the throttle body-side in the intake passage and also being provided so as to connect to an inner peripheral surface of the intake passage at a position of non-contact when the valve is fully open.

The present disclosure provides a rotational angle detecting device. An IC substrate has a flat surface extending along a rotational axis of a throttle valve. Yokes forms, together with the magnets, a closed magnetic circuit. A first Hall element outputs a first signal according to the magnetic flux density in a first direction along the flat surface. A second Hall element outputs a second signal according to the magnetic flux density in a second direction intersecting the flat surface. The first and second Hall elements are positioned within a region that is surrounded by the magnets and the yoke and that is between an edge surface and an edge surface.

A mass-flow throttle for highly accurate control of gaseous supplies of fuel and/or air to the combustion chambers for a large engine in response to instantaneous demand signals from the engine's engine control module (ECM), especially for large spark-ignited internal combustion engines. With a unitary block assembly and a throttle blade driven by a non-articulated rotary actuator shaft, in combination with control circuitry including multiple pressure sensors as well as sensors for temperature and throttle position, the same basic throttle concepts are suited to be used for both mass-flow gas (MFG) and mass-flow air (MFA) throttles in industrial applications, to achieve highly accurate mass-flow control despite pressure fluctuations while operating in non-choked flow. The throttle, in combination with the sensors and ECM, enable detection of backfire events, with the throttle system further being enabled to take operative measures to prevent damage to the throttle components resulting from a backfire event.

A mass-flow throttle for highly accurate control of gaseous supplies of fuel and/or air to the combustion chambers for a large engine in response to instantaneous demand signals from the engine's engine control module (ECM), especially for large spark-ignited internal combustion engines. With a unitary block assembly and a throttle blade driven by a non-articulated rotary actuator shaft, in combination with control circuitry including multiple pressure sensors as well as sensors for temperature and throttle position, the same basic throttle concepts are suited to be used for both mass-flow gas (MFG) and mass-flow air (MFA) throttles in industrial applications, to achieve highly accurate mass-flow control despite pressure fluctuations while operating in non-choked flow. The throttle, in combination with the sensors and ECM, enable detection of backfire events, with the throttle system further being enabled to take operative measures to prevent damage to the throttle components resulting from a backfire event.

A sensor module is adapted to be attached to an actuator body incorporating an electric actuator. The sensor module includes a sensor assembly, a sensor cover, and a connector housing. The sensor assembly includes a sensor detection part and a sensor housing. The sensor detection part is configured to detect a physical change amount of a driven body driven by the electric actuator and to convert the physical change amount into an electrical signal. The sensor housing incorporates the sensor detection part. The sensor cover is provided separately from the sensor housing and is attached to the actuator body. The sensor module is configured integrally by attaching the sensor assembly to the sensor cover. A connector terminal electrically connected to a connection terminal of the sensor detection part is insert-molded in the connector housing. The connector housing is provided integrally with the sensor housing.

In an electric actuator, one end portion of a return spring is hooked to a first slit formed in a radially outer guide of an output gear, so that the return spring is twisted for a predetermined angle that is slightly smaller than an initial set angle. A tilted slit portion is formed at an opening of a second slit that is formed in a covering wall of a spring installation member to twist the return spring to a predetermined initial set angle. Thereby, simultaneously with assembling of a valve shaft to the output gear, the return spring is twisted for the initial set angle. Thus, an assembling work of the electric actuator can be simplified.