Assembling method for a heater-equipped air-fuel ratio sensor
AssigneeDenso Corporation
InventorsIsao Watanabe, Michihiro Yamakawa, Masanori Fukutani
Life of this patent
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Abstract
A heater is inserted into an inside chamber of a sensor element until a tip end of the heater is surely brought into contact with a bottom surface of the inside chamber. Next, a metallic holder is attached on an outside surface of the heater. Then, the metallic holder is slid along the outside surface of the heater toward the bottom surface of the sensor element to engage the metallic holder with an edge of the sensor element.
Claims57
A method for assembling a heater-equipped air-fuel ratio sensor which comprises a cylindrical sensor element having an open end and an opposed closed end with an inside chamber defined therein and a stick-like heater inserted in said inside chamber of said sensor element so that a tip end of said heater is brought into contact with a bottom surface of said inside chamber, and said heater is supported to said sensor element by a metallic holder, said assembling method comprising the steps of:
- inserting said heater into said inside chamber of said sensor element until the tip end of said heater is brought into contact with the bottom surface of said inside chamber;
- and
- sliding said metallic holder along an outside surface of said heater toward the bottom surface of said inside chamber until said metallic holder is engaged with said sensor element.
A method for assembling a heater-equipped air-fuel ratio sensor which comprises a cylindrical sensor element having an open end and an opposed closed end with an inside chamber defined therein and a stick-like heater inserted in said inside chamber of said sensor element so that a tip end of said heater is brought into contact with a bottom surface of said inside chamber, and said heater is supported to said sensor element by a metallic holder, said assembling method comprising the steps of:
- installing said metallic holder elastically on an upper portion of said heater;
- inserting said heater into said inside chamber of said sensor element until said metallic holder is brought into contact with said sensor element, under a condition where the tip end of said heater is not brought into contact with the bottom surface of said inside chamber;
- shifting said metallic holder toward the bottom surface of said inside chamber, so that said heater held by said metallic holder is further inserted in said inside chamber and the tip end of said heater is brought into contact with the bottom surface of said inside chamber of said sensor element;
- and
- sliding said metallic holder along an outside surface of said heater toward the bottom surface of said inside chamber until said metallic holder is engaged with said sensor element,
- wherein the following relationship is established
- a<b
- where "a" represents an axial clearance between the tip end of said heater and the bottom surface of said inside chamber at a moment said metallic holder is brought into contact with said sensor element, while "b" represents an axial shift distance of said metallic holder with respect to said outside surface of said heater.
A method for assembling a heater-equipped air-fuel ratio sensor which comprises a cylindrical sensor element having an open end and an opposed closed end with an inside chamber, defined therein and a stick-like heater inserted in said inside chamber of said sensor element so that a tip end of said heater is brought into contact with a bottom surface of said inside chamber, and said sensor element and an insulator are secured to a housing, and furthermore said heater is supported to said insulator by a metallic holder, said assembling method comprising the steps of:
- inserting said heater into said inside chamber of said sensor element until the tip end of said heater is brought into contact with the bottom surface of said inside chamber;
- and
- sliding said metallic holder along an outside surface of said heater until said metallic holder is engaged with said insulator.
A method for assembling a heater-equipped air-fuel ratio sensor which comprises a cylindrical sensor element having an open end and an opposed closed end with an inside chamber defined therein and a stick-like heater inserted in said inside chamber of said sensor element so that a tip end of said heater is brought into contact with a bottom surface of said inside chamber, and said sensor element and an insulator are secured to a housing, and furthermore said heater is supported to said insulator by a metallic holder, said assembling method comprising the steps of:
- installing said metallic holder elastically on an upper portion of said heater;
- inserting said heater into said inside chamber of said sensor element until said metallic holder is brought into contact with said insulator, under a condition where the tip end of said heater is not brought into contact with the bottom surface of said inside chamber;
- shifting said metallic holder toward the bottom surface of said inside chamber, so that said heater held by said metallic holder is further inserted in said inside chamber and the tip end of said heater is brought into contact with the bottom surface of said inside chamber of said sensor element;
- and
- sliding said metallic holder along an outside surface of said heater toward the bottom surface of said inside chamber until said metallic holder is engaged with said insulator,
- wherein the following relationship is established
- a<b
- where "a" represents an axial clearance between the tip end of said heater and the bottom surface of said inside chamber at a moment said metallic holder is brought into contact with said insulator, while "b" represents an axial shift distance of said metallic holder with respect to said outside surface of said heater.
Dependencies are inferred from the claim text.