| 摘要 |
An improved throttle body (20) includes an offset axis drum valve (26) and shaped throat (58). The offset axis and shaped throat (58) provide gradual initial opening for better throttle control and the drum valve (26) includes a lower face (40) matching the profile of the air path (24) through the throttle body (20) when rotated to a fully open throttle position, providing an optimal flow at full throttle. The offset axis drum (26) further includes a slightly decreasing radius. As the drum (26) opens, the surface (27) of the drum (26) retreats from the throttle body wall (31) providing clearance for dusty environments and reducing tolerances for reduced manufacturing cost. A fuel injector pocket (32) position provides a spray pattern (52) aligned with an initial air flow as the throttle body (20) opens providing better mixing at part throttle. The throttle body (20) further creates a cavity (30) under the drum (26) in the closed position providing an increased volume in the intake tract which improves throttle response. |
