Patent ID: 10458827

Abstract:
A thermal type air flow meter, capable of suppressing deformation of a base member at the time of molding to secure dimensional accuracy and reduce an influence of a dimension change on measuring accuracy, is to be placed in an intake passage of an internal combustion engine. The thermal type of air flow meter includes a resin component having a secondary passage into which part of the air passing through the intake passage can flow, and a circuit board configured to output a signal according to an air flow rate based on a signal from a flow rate detecting element disposed on the circuit board. The circuit board on which the flow rate detecting element is disposed is installed so that the flow rate detecting element is placed in the secondary passage. The resin component includes a board fixing part to which the circuit board is fixed, a secondary passage constituting part that is a part of the secondary passage, and ribs provided on a rear surface, which is a side opposite to a surface of the board fixing part, with the ribs forming a grid pattern.