Patent ID: 7047935

Claim:
A throttle body receiving a throttle valve, the throttle body comprising: a bore wall part that has a double-pipe structure including: an inner pipe that rotatably receives the throttle valve; an outer pipe that is arranged on a radially outer side of the inner pipe to define a cylindrical space with an outer periphery of the inner pipe therebetween; and an annular connecting part that connects the inner pipe and the outer pipe, such that the annular connecting part partitions substantially entirely over a circumferential area of the cylindrical space defined between the inner pipe and the outer pipe, wherein the inner pipe, the outer pipe and the annular connecting part are integrally formed, the annular connecting part has an axial thickness that is less than a minimum thickness of the inner pipe in a radial direction thereof and a minimum thickness of the outer pipe in a radial direction thereof, the outer pipe has a radial thickness that is greater than a radial thickness of the inner pipe, and a first portion of the outer pipe, which is on an axially unstream side with respect to the annular connecting part, has a radial thickness that is substantially the same as a radial thickness of a second portion of the outer pipe, which is on an axially downstream side with respect to the annular connecting part.