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US 8,796,909 B2Granted
Igniter plug with cooling fluid and method of manufacturing igniter plug
AssigneeNgk Spark Plug Co., Ltd.
InventorsYukinobu Hasegawa, Yasushi Sakakura
Life of this patent
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Abstract
A ground electrode of an igniter plug has inlets for supplying cooling fluid therethrough to a first space formed between an insulator and the ground electrode, and first outlets located forward of the inlets and radially outward of the inner circumference of a ground electrode forward-end portion and adapted to discharge the cooling fluid therethrough. A second space communicating with the first space and having a second outlet for discharging the cooling fluid therethrough is formed between a forward end surface of the insulator and a surface of the ground electrode which faces the forward end surface.
Claims10
An igniter plug comprising:
- a center electrode,
- an insulator having an axial bore extending in an axial direction and accommodating the center electrode therein, and
- a ground electrode accommodating the insulator therein in such a manner as to form a first space between the ground electrode and at least a portion of an outer circumferential surface of the insulator, wherein
- the ground electrode has a ground electrode forward-end portion which forms a gap in cooperation with the center electrode;
- with a side toward the gap being taken as a forward side along the axial direction, the ground electrode has an inlet for supplying cooling fluid therethrough to the first space, and a first outlet located forward of the inlet and radially outward of an inner circumference of the ground electrode forward-end portion and adapted to discharge the cooling fluid therethrough;
- and
- a second space communicating with the first space and having a second outlet for discharging the cooling fluid therethrough is formed between an insulator end surface, which is a forward end surface of the insulator, and a ground electrode counter surface, which is a surface of the ground electrode which faces the insulator end surface.
4 more elements
A method of manufacturing an igniter plug having:
- a center electrode,
- an insulator having an axial bore extending in an axial direction and accommodating the center electrode therein, and
- a ground electrode accommodating the insulator therein in such a manner as to form a first space between the ground electrode and at least a portion of an outer circumferential surface of the insulator, wherein
- the ground electrode has a ground electrode forward-end portion which forms a gap in cooperation with the center electrode;
- with a side toward the gap being taken as a forward side along the axial direction, the ground electrode has an inlet for supplying cooling fluid therethrough to the first space, and a first outlet located forward of the inlet and radially outward of an inner circumference of the ground electrode forward-end portion and adapted to discharge the cooling fluid therethrough;
- a second space communicating with the first space and having a second outlet for discharging the cooling fluid therethrough is formed between an insulator end surface, which is a forward end surface of the insulator, and a ground electrode counter surface, which is a surface of the ground electrode which faces the insulator end surface comprising:
- a step of fixing the insulator and the ground electrode together through utilization of a filler powder and crimping,
- wherein the fixing step includes a step of heating the filler powder.
5 more elements
A method of manufacturing an igniter plug having:
- a center electrode,
- an insulator having an axial bore extending in an axial direction and accommodating the center electrode therein, and
- a ground electrode accommodating the insulator therein in such a manner as to form a first space between the ground electrode and at least a portion of an outer circumferential surface of the insulator, wherein
- the ground electrode has a ground electrode forward-end portion which forms a gap in cooperation with the center electrode;
- with a side toward the gap being taken as a forward side along the axial direction, the ground electrode has an inlet for supplying cooling fluid therethrough to the first space, and a first outlet located forward of the inlet and radially outward of an inner circumference of the ground electrode forward-end portion and adapted to discharge the cooling fluid therethrough;
- and
- a second space communicating with the first space and having a second outlet for discharging the cooling fluid therethrough is formed between an insulator end surface, which is a forward end surface of the insulator, and a ground electrode counter surface, which is a surface of the ground electrode which faces the insulator end surface comprising the steps of:
- disposing a flammable packing on the ground electrode counter surface of the ground electrode;
- inserting the insulator into the ground electrode until the insulator end surface comes into contact with a surface of the flammable packing;
- and
- burning off the flammable packing so as to convert a space occupied by the flammable packing into the second space.
8 more elements
Dependencies are inferred from the claim text.