Denso Corporation

Asmo Co., Ltd.

Yuji Nakano

Shigeru Hasegawa

Hiroshi Takeyama

Yasuyoshi Yamada

Ryo Sano

Akira Furukawa

Shinji Ishida

Naogi Hisanaga

Osamu Terakura

Michio Koshimizu

A rotation angle detecting device includes a magnet (), a magnetic substance unit (), and a non-contact magnetic detection element (). The magnet () rotates with an object to be measured and includes two ends magnetized so as to have opposite polarities. The magnetic substance unit () forms a predetermined air gap with the two ends of the magnet () and is divided into magnetic members () so as to provide plane symmetry with respect to a vertical plane perpendicularly crossing a rotational center axis of the magnet () to form a magnetic detection gap () by the division. The non-contact magnetic detection element () is provided in the magnetic detection gap () between the magnetic members () so as to output a signal corresponding to a density of a magnetic flux passing through the magnetic detection gap (). The rotation angle of the object to be measured is detected based on the output signal from the magnetic detection element (). The magnetic members () include reverse warp parts () so that the air gap suddenly increases when the magnet () rotates at a predetermined rotation angle from a state where the air gap is minimum in a direction in which the air gap increases.

Rotation angle detecting device

A flow control valve having a seating surface formed on a valve element to contact a valve seat when the valve is closed has a shape of a part of a hypothetical spherical surface having a spherical center at a center of a supporting member. Therefore, the distance from the center of the supporting member to the seating surface is kept constant, and the valve element can be seated at a periphery of the valve seat without a gap, even if the shaft is inclined. Thus, the valve leakage is reduced. The supporting member supports a shaft connected to the valve element movable in an axial direction of the shaft. The center of the supporting member is aligned with a center of the valve seat. Movement of the supporting member in a radial direction of the supporting member is prohibited. Therefore, the center of the supporting member is not displaced from the center of the valve seat in the radial direction. Accordingly, the displacement of the shaft in the radial direction can be prevented. Therefore, the valve element is certainly seated on the valve seat, and the valve leakage is prevented.

Flow control valve

Flow control valve for reducing valve leakage

A solenoid valve has a biasing member for generating biasing force and a permanent magnet for generating magnetic force. When both the biasing force and the magnetic force act on a movable member, the direction of the biasing force opposes the direction of the magnetic force. Therefore, the position of the movable member is determined based on the balance between the biasing force and the magnetic force. As a result, even when the solenoid coil is not excited, a valve member moving together with the movable member stays apart from the valve seat by a predetermined distance to maintain an open fluid channel.

Solenoid valve apparatus

An actuator for an engine idling control mechanism, which includes a throttle valve disposed in an intake manifold tube, a slidable plunger unit, a drive mechanism for forcibly sliding the plunger unit, a detecting device for detecting whether the throttle valve is open or closed, and a control unit for controlling the drive mechanism in relation to the detecting device, for properly setting the degree of opening of the throttle valve at the time the engine is idling. The plunger unit is designed in such a way that, when the throttle valve is closed, the plunger unit is pushed by a control lever which is positioned in accordance with the degree of opening of the throttle valve. The drive mechanism can set the degree of opening of the throttle valve through the plunger unit and the control lever. The detecting device includes a pair of magnets and a detector for detecting the magnetic flux of the magnets. The magnets are slidable in the same direction as the plunger unit, and are slid by the plunger unit when the throttle valve is closed, for adjusting the degree of opening of the throttle valve.

Actuator for engine idling control mechanism

Growing community of inventors

Toyota, Japan

Yuji Nakano