Intake air amount detecting device for an internal combustion engine

An intake air amount detecting device for an internal combustion engine, comprising:

• a temperature detector housing including a housing member of a heat-insulating material disposed within an intake pipe of an internal combustion engine and defining first and second through-holes substantially parallel to the axis of said intake pipe;
• first and second shock-absorbing protective sleeves of a shock-absorbing material having outer faces disposed in face-to-face contacting relationship with the inner surfaces of said first and second through-holes, respectively;
• an electric heater including a base of an electrically insulating material supported by and disposed within said first shock-absorbing protective sleeve and defining a first opening substantially co-axial with said first sleeve, said electric heater also including heat generating resistor wire means extending in a grid pattern across the cross-sectional area of said first opening;
• a first temperature detecting element including a base of an electrically insulating material supported by and disposed within said first shock-absorbing protective sleeve downstream of said electric heater and defining a second opening disposed in substantially co-axial and fluid-flow communication with said first opening, said first temperature detecting element also including electrically resistive wire means extending in a grid pattern across the cross-sectional area of said second opening;
• and
• a second temperature detecting element including a base of an electrically insulating material supported by and disposed within said second shock-absorbing protective sleeve and defining a third opening substantially co-axial with said second sleeve, said second temperature detecting element also including electrically resistive wire means extending in a grid pattern across the cross-sectional area of said third opening.

An intake air amount detecting device for an internal combustion engine, comprising:

• a temperature detector housing including a housing member of a heat-insulating material disposed within an intake pipe of an internal combustion engine and defining first and second through-holes substantially co-axial to the axis of said intake pipe;
• first and second shock-absorbing protective sleeves having outer faces disposed in face-to-face contacting relationship with the inner surfaces of said first and second through-holes, respectively, each sleeve being formed with a radially inwardly opened groove;
• an electric heater including a base of an electrically insulating material disposed in the groove in said first shock-absorbing protective sleeve and supported thereby and defining a first opening substantially co-axial with said first sleeve, said electric heater also including heat generating resistor wire means extending in a grid pattern across the cross-sectional area of said first opening;
• a first temperature detecting element including a base of an electrically insulating material disposed in the groove in said first shock-absorbing protective sleeve downstream of said electric heater and supported by said first sleeve and defining a second opening disposed in substantially co-axial and fluid-flow communication with said first opening, said first temperature detecting element also including electrically resistive wire means extending in a grid pattern across the cross-sectional area of said second opening;
• and
• a second temperature detecting element including a base of an electrically insulating material disposed in the groove in said second shock-absorbing protective sleeve and supported thereby and defining a third opening substantially co-axial with said second sleeve, said second temperature detecting element also including electrically resistive wire means extending in a grid pattern across the cross-sectional area of said third opening.