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An air throttle (10) for an internal combustion engine has a butterfly-vane (16) mounted for rotation in the engine charge air inlet (15). The butterfly-vane is mounted on a rigid tubular shaft (18) having an idle air bleed slot (22) therethrough with a tubular idle valve (24) slip fit within the sh

An air throttle (10) for an internal combustion engine has a butterfly-vane (16) mounted for rotation in the engine charge air inlet (15). The butterfly-vane is mounted on a rigid tubular shaft (18) having an idle air bleed slot (22) therethrough with a tubular idle valve (24) slip fit within the shaft for concentric rotation therein. With the butterfly-vane closed for idle mode running, the idle valve is rotated between set limits established by abutment surfaces (26) and (36) defined by slot (25) to control idle air flow and idle speed. Upon rotation of the idle valve beyond the set limits, the butterfly-vane is progressively opened for off-idle mode running speed control.

대표청구항 ▼

A throttle valve assembly for the charge air inlet passage of an internal combustion engine comprising: housing means defining a portion of said inlet passage; valve means carried by said housing means within said passage portion for rotation about an axis transverse to the direction of flow in said

A throttle valve assembly for the charge air inlet passage of an internal combustion engine comprising: housing means defining a portion of said inlet passage; valve means carried by said housing means within said passage portion for rotation about an axis transverse to the direction of flow in said passage to effect modulation of said flow, said valve means comprising a generally tubular hub portion concentric to said axis, a generally circular disc throttle member extending through said hub portion for rotation therewith, and an idle flow passageway extending radially through said hub portion for directly communicating an upstream portion of said passage with a downstream portion of said passage; and a generally tubular idle speed control member mounted for concentric rotation about said axis within said hub portion to effect modulation of fluid flow through said idle flow passageway.