Air flow meter
AssigneesHitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
InventorsMitsukuni Tsutsui, Shinya Igarashi, Minoru Takahashi
Life of this patent
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Abstract
An air flow meter has a body forming a main passage defining an intake air passage of an internal combustion engine. An auxiliary passage within the main passage has a longitudinal passage in the axial direction and at least one transverse passage in the radial direction of the main passage. The auxiliary passage is defined by a member having a radially directed portion connected to an internal wall of the main passage. A hollow space is provided in the radially directed portion to render the wall thickness of the radially directed portion substantially uniform. Additionally, the hollow space is separated from the longitudinal passage by an auxiliary member which, in a preferred embodiment, surrounds a heat sensitive resistor.
Claims12
An air flow meter comprising:
- a body forming a main passage defining an intake air passage of an internal combustion engine;
- auxiliary passage defining means unitarily molded with said body and arranged in said main passage to form an auxiliary passage having a longitudinal passage in the axial direction of said main passage and at least two transverse passages in the radial direction of said main passage;
- said auxiliary passage defining means having radially directed portions thereof defining said transverse passages respectively connected to an internal wall of said main passage;
- a heat-sensitive resistor arranged in said longitudinal passage of said auxiliary passage for metering the flow rate of intake air;
- said heat sensitive resistor being connected to a holder in only one of said transverse passages;
- and another of said transverse passages having a hollow space therein, the wall thickness of the auxiliary passage defining means being rendered substantially uniform, said hollow space being separated from said longitudinal passage by an auxiliary member forming part of said auxiliary passage defining means.
Dependencies are inferred from the claim text.