Throttle device having air flow compensation function

A throttle device comprising:

• a throttle body forming an intake air passage therein;
• a throttle valve rotatably supported by the throttle body in the intake air passage for adjusting a flow rate of intake air flowing in the intake air passage, the throttle valve having an upstream half rotatable toward an upstream side of a flow of the intake air when the intake air passage is opened and a downstream half rotatable toward a downstream side of the flow of the intake air when the intake air passage is opened;
• and
• compensation means provided on one of the throttle body and the throttle valve for allowing the upstream side air flow area to be smaller than the downstream side air flow area,
• wherein an upstream side air flow area between the upstream half and the throttle body is smaller than a downstream side air flow area between the downstream half and the throttle body, and
• wherein the compensation means includes of an enlarged portion formed on an inner wall of the throttle body positioned at the side of the downstream half to allow the downstream side air flow area to be larger than the upstream side air flow area.

A throttle device comprising:

• a throttle body forming an intake air passage therein;
• a throttle valve rotatable supported by the throttle body in the intake air passage for adjusting a flow rate of intake air flowing in the intake air passage, the throttle valve having an upstream half rotatable toward an upstream side of a flow of the intake air when the intake air passage is opened and a downstream half rotatable toward a downstream side of the flow of the intake air when the intake air passage is opened;
• and
• a projection directed toward the upstream side in the flow of the intake air and formed on a peripheral edge of an upstream-side of the upstream half,
• wherein an upstream side air flow area between the upstream half and the throttle body is smaller than a downstream side air flow area between the downstream half and the throttle body.

A throttle device comprising:

• a throttle body forming a cylindrical intake air passage therein;
• a throttle shaft rotatably supported by the throttle body and crossing transversely through a center of the intake air passage;
• a throttle valve shaped in a disk and fixed to the throttle shaft in the intake air passage, the throttle valve having an upstream half from the throttle shaft and a downstream half from the throttle shaft which are rotatable toward an upstream side and a downstream side of an air flow in the intake air passage when the intake air passage is opened respectively;
• a compensation member fixed to a downstream side of the upstream half of the throttle valve and having a thickest part near an outer periphery of the throttle valve to reduce an upstream side air flow area between the upstream half and the throttle body to be smaller than a downstream side air flow area between the downstream half and the throttle body when the throttle valve rotates to open the intake air passage;
• and
• an air flow meter located upstream of the throttle valve and dislocated toward the upstream half of the throttle valve from a longitudinal central axis of the intake air passage.

The throttle device comprising:

• a throttle body forming a cylindrical intake air passage therein;
• a throttle shaft rotatable supported by the throttle body and crossing transversely through a center of the intake air passage;
• a throttle valve shaped in a disk and fixed to the throttle shaft in the intake air passage, the throttle valve having an upstream half from the throttle shaft and a downstream half from the throttle shaft which are rotatable toward an upstream side and a downstream side of an air flow in the intake air passage when the intake air passage is opened respectively;
• a compensation member fixed to a downstream side of the upstream half of the throttle valve and having a thickest part near an outer periphery of the throttle valve to reduce an upstream side air flow area between the upstream half and the throttle body to be smaller than a downstream side air flow area between the downstream half and the throttle body when the throttle valve rotates to open the intake air passage;
• and
• a flow dividing member attached to an upstream side of the throttle valve and having a gradually changing surface including a thickest part near the outer periphery of the upstream half of the throttle valve, the thickest part being for diving an intake air toward the outer periphery of the upstream half of the throttle valve and toward the downstream half of the throttle valve.

A throttle device comprising:

• a throttle body forming a cylindrical intake passage therein;
• a throttle valve shaped in a disk and disposed in the intake air passage, the throttle valve having an upstream half and a downstream half which are rotatable toward an upstream side and a downstream side for an air flow in the intake passage when the intake air passage is opened respectively;
• a throttle shaft fixed to the throttle valve and rotatably supported by the throttle body, the throttle shaft crossing transversely through the throttle valve and being dislocated from a longitudinal central axis of the intake air passage to reduce an upstream side air flow area between the upstream half and the throttle body to be smaller than a downstream side air flow area between the downstream half and the throttle body when the throttle valve rotates to open the intake air passage;
• and
• an air flow meter located upstream of the throttle valve and dislocated toward the upstream half of the throttle valve from a longitudinal central axis of the intake air passage.

A throttle device comprising:

• a throttle shaft;
• a throttle valve shaped in a disk and fixed to the throttle shaft, the throttle valve having an upstream half and a downstream half extending from the throttle shaft;
• and which are rotatable toward an upstream side and a downstream side of an air flow in the intake passage when the intake air passage is opened respectively;
• and
• a throttle body forming a cylindrical intake air passage therein and supporting rotatably the throttle shaft in the intake air passage, the throttle body having an enlarged part near an outer periphery of the downstream half of the throttle valve to increase a downstream side air flow area between the downstream half and the throttle body to be larger than an upstream side air flow area between the upstream half and the throttle body when the throttle valve rotates to open the intake air passage.