Patent ID: 7546828

Claim:
A throttle body assembly for an internal combustion engine, comprising: (a) a housing in which a bore is formed through which a fluid can flow; (b) a throttle plate disposed in the housing; and (c) a pivot axis which divides the throttle plate into two throttle blades, wherein the pivot axis is disposed so as to be radially offset with respect to the throttle plate, wherein the throttle plate can be pivoted about the pivot axis, via a positioning device, so as to close the bore by abutting a seat face that is formed by an inner wall of the housing and whereby the throttle plate can be pivoted away from said seat face to open the bore, wherein the pivot axis is also disposed so as to be axially offset with respect to the throttle plate so that when the bore is opened a first of the two throttle blades pivots in a direction away from a cross section of the bore that runs through the pivot axis and a second of the two throttle blades pivots in a direction towards the cross section of the bore that runs through the pivot axis, wherein a radial peripheral surface of the throttle plate is formed, at least by sections, in the form of a sphere so that in the position that closes the bore the entire peripheral surface of the throttle plate abuts the seat face of the housing with a linear contact, and wherein the cross section of the bore through which fluid flows widens in a first section of the housing in an axial direction from the seat face to the pivot axis and the cross section of the bore widens in a second section of the housing on a side of the throttle plate, namely the side diametrically opposite the pivot axis, in the closed state in the direction of the pivot axis on a side of the first of the two blades, wherein widening in the first section of the housing is asymmetrical to widening in the second section of the housing.