US 6,543,417 B2Granted

Intake air control device

AssigneeDenso Corporation

InventorsKunio Tanaka, Takashi Hamaoka

Life of this patent

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Abstract

In an intake air control device, a valve gear for driving a shaft of a throttle valve is made of non-magnetic metal that does not interfere with a magnetic circuit constituted by split type permanent magnet and yoke. Accordingly, as the magnetic flux from the magnetic circuit is effectively used without leakage to the valve gear, an opening degree of the throttle valve is accurately detected by a non-contact type Hall element. Further, it is not necessary to reinforce with other metal a ring shaped fixing portion of the valve gear that is rigidly fixed to an end of the shaft by staking or welding and an outer protrusion of the valve gear that comes in hitting contact with a stopper of a throttle body when the throttle valve is fully closed, resulting in less number of component parts and lower cost.

Claims8

Dependent claims

An intake air control device movable in response to an acceleration pedal for an internal combustion engine comprising:

a throttle body having an intake conduit to the internal combustion engine;
a throttle valve having a shaft rotatably held in the throttle body for opening and closing the intake conduit;
a rotary member made of non-magnetic metal and rigidly fixed to the shaft for driving the shaft in response to the acceleration pedal so as to rotate the throttle valve;
and
a non-contact type angular position detector having a magnetic flux generating member and a magnetic flux detecting element, the magnetic flux generating member being attached to the rotary member so as to rotate together therewith and the magnetic flux detecting element being stationarily positioned to face the magnetic flux generating member with an air gap therebetween,
wherein the magnetic flux detecting element generates an electric signal in response to a change of magnetic flux applied thereto from the magnetic flux generating member so that an angular position of the shaft driven by the rotary member is detected.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/167,508Filed 13 Jun 2002
Priority: JP 2001-18038814 Jun 2001
Published: US 2002/0189584 A119 Dec 2002
Granted: 8 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F02D 11/10
Characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance: of the…
F02D 2009/0284
Arrangements; Control features; Details thereof: throttle control device with means for signalling a certain throttle opening, e.g. by a steplike…
F02D 2009/0294
Arrangements; Control features; Details thereof: throttle control device with provisions for actuating electric or electronic sensors
F02D 2011/102
Characterised by the means for actuating the throttles: at least one throttle being moved only by an electric actuator