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US 2013/0199037 A1Published application
Method for producing glow plug terminals, and method for producing glow plugs
AssigneeNgk Spark Plug Co., Ltd.
InventorYuki Okumura
Life of this patent
Estimating the term…
Abstract
A method of producing a glow plug, wherein a pin terminal is produced by applying a plastic working to a workpiece made of a conductive metal. The production method has: a first step of obtaining a first workpiece; a second step of setting the first workpiece to a second workpiece; a third step of setting the second workpiece to a third workpiece; and a fourth step of setting the third workpiece to a fourth workpiece.
Claims10
A method of producing a pin terminal for a glow plug the method comprising:
- obtaining a first workpiece which has a rod-like shape, and which is made of the conductive metal;
- plastically deforming an end surface of a rear end side of the first workpiece into a curved surface shape to obtain a second workpiece;
- plastically deforming a rear end side of the second workpiece into a small-diameter portion which is configured to be fitted to a cap for supplying electricity from an outside, and plastically deforming a tip end side of the second workpiece into a large-diameter portion which is larger in diameter than the small-diameter portion, to obtain a third workpiece;
- and
- plastically deforming a flange between the small-diameter portion and the large-diameter portion, the flange being larger in outer diameter than the large-diameter portion, and an engagement portion formed between a position where a diameter of the flange is maximum and the large-diameter portion, an outer diameter of the engagement portion being gradually reduced toward the large-diameter portion, and the engagement portion being configured to be engaged with the cap to obtain a fourth workpiece.
2 more elements
A method of producing a glow plug including:
- a cylindrical housing;
- a heater which is fixed into the housing, and which has a heating portion projecting from a tip end of the housing;
- a rod-like inner shaft which is placed in the housing, and in which a rear end portion projects from a rear end of the housing;
- and a pin terminal which is fitted to the rear end portion of the inner shaft, which is used for supplying electricity from an outside to the heating portion through the inner shaft, the method comprising:
- obtaining a first workpiece which has a rod-like shape, and which is made of the conductive metal;
- plastically deforming an end surface of a rear end side of the first workpiece into a curved surface shape, and setting to a second workpiece;
- plastically deforming a rear end side of the second workpiece into a small-diameter portion which is configured to be fitted to a cap for supplying electricity from an outside, and plastically deforming a tip end side of the second workpiece into a large-diameter portion which is larger in diameter than the small-diameter portion, to obtain a third workpiece;
- and
- plastically deforming the third workpiece to form a flange between the small-diameter portion and the large-diameter portion, the flange being larger in outer diameter than the large-diameter portion, and an engagement portion formed between a position where a diameter of the flange is maximum and the large-diameter portion, an outer diameter of the engagement portion being gradually reduced toward the large-diameter portion, and the engagement portion being configured to be engaged with to obtain a fourth workpiece.
6 more elements
Dependencies are inferred from the claim text.