To improve a production efficiency by retaining valve seat machining at the minimum necessary level by eliminating the execution of the valve seat machining in an area of an intake path corresponding to a midway between a first and second throttle valves.
A throttle body 10 is divided into an upstream side body half 10a and a downstream side body half 10b, in a midway in an axial direction of an intake path 11. First and second annular valve seats 12, 13 separated from each other are respectively protruded on the intake path 11 of the upstream side body half 10a and downstream side body half 10b. A first throttle valve 20 opening/closing the intake path 11 of the upstream side body half 10a is pivotally supported to the upstream side body half 10a by collaborating with a first valve seat 12. A second throttle valve 21 opening/closing the intake path 11 of the downstream side body half 10b is pivotally supported to the downstream side body half 10b by collaborating with a second valve seat 13. The upstream side body half 10a and downstream side body half 10b are fastened to each other so as to be separated from each other by a fastening member 18.
COPYRIGHT: (C)2011,JPO&INPIT
Morita Shinichiro
| JP4330356A | ||||
| JP58023226A | ||||
| JP63295825A |
Kazuaki Niki
Nude Shima Shinji