초록 ▼

A heat sensitive flow amount sensor of the invention includes a measuring pipe disposed in the inlet pipe of an internal combustion engine, an air flow amount detecting element disposed in the measuring pipe for detecting the flow amount of intake air flowing in the inlet pipe making use of the fact

A heat sensitive flow amount sensor of the invention includes a measuring pipe disposed in the inlet pipe of an internal combustion engine, an air flow amount detecting element disposed in the measuring pipe for detecting the flow amount of intake air flowing in the inlet pipe making use of the fact that a quantity of heat loss corresponds to the flow amount of the intake air, and a straightening member disposed on the outer periphery of the measuring pipe along the axial line thereof for straightening the intake air flowing into the measuring pipe by straightening the intake air flowing in the inlet pipe. With this arrangement, even if the heat sensitive flow amount sensor is disposed in the vicinity of a throttle valve, the measuring accuracy of the flow amount of air is not lowered and the size of an internal combustion engine can be reduced by the employment of the heat sensitive flow amount sensor.

대표청구항 ▼

[ What is claimed is:] [1.] A heat sensitive flow amount sensor, comprising:a measuring pipe disposed in a main pipe and supported in said main pipe by a support member so that said measuring pipe is disposed generally in the center of said main pipe in the radial direction of said main pipe, said m

[ What is claimed is:] [1.] A heat sensitive flow amount sensor, comprising:a measuring pipe disposed in a main pipe and supported in said main pipe by a support member so that said measuring pipe is disposed generally in the center of said main pipe in the radial direction of said main pipe, said measuring pipe having a longitudinal axis parallel to a longitudinal axis of said main pipe;a flow amount detecting element disposed in said measuring pipe for detecting the amount of a gas flowing in the main pipe; andat least one flow straightening member provided in the annular region between said measuring pipe and said main pipe, and extending along the longitudinal axis of said measuring pipe, said flow straightening member straightening the gas flowing into said main pipe and thereby also straightening the gas flowing into said measuring pipe.