1. A wiring board having a lead pin comprising:
a connecting pad which is formed on the wiring board, and to which the lead pin is bonded through a conductive material,
wherein the lead pin includes:
a shaft portion;
a head portion which is provided on one end of the shaft portion, said head portion having a diameter greater than that of the shaft portion;
a protruded portion which is formed on a surface side of the head portion opposed to the connecting pad, the protruded portion formed to take a hemispherical shape which is convexed toward the connecting pad, the hemispherical shaped protruded portion having a diameter which is less than the diameter of the head portion;
a first taper portion which is formed between the head portion and a base part of the shaft portion, said first taper portion tapering outwardly from the base part of the shaft portion toward an outer edge of the head portion; and
a second taper portion which is formed between the head portion and a base part of the protruded portion, wherein the base part of the protruded portion is provided at an angle relative to the second taper portion.
2. The wiring board having a lead pin according to claim 1, wherein a planer shape of the head portion is formed in a circular flat plate manner,
and wherein the protruded portion is concentric with the shaft portion and is protruded from the head portion.
3. The wiring board having a lead pin according to claim 1, wherein the first and second taper portions take such a shape as to divide the head portion into two parts in a vertical direction.
4. The wiring board having a lead pin according to claim 1, wherein a trench is formed between the base part of the protruded portion and an outer peripheral edge of the head portion.
5. The wiring board having a lead pin according to claim 1, wherein a trench is formed in a communicating arrangement between the protruded portion and an outer peripheral edge of the head portion.
6. The wiring board having a lead pin according to claim 1, wherein the first taper portion tapers extends at a non-perpendicular angle from the shaft portion toward the outer edge of the head portion.
7. The wiring board having a lead pin according to claim 1, wherein the head portion has a cylindrical shape.
8. A wiring board having a lead pin comprising:
a connecting pad which is formed on the wiring board, and to which the lead pin is bonded through a conductive material,
wherein the lead pin includes:
a shaft portion;
a head portion which is provided on one end of the shaft portion, said head portion having a diameter greater than that of the shaft portion;
a protruded portion which is formed on a surface side of the head portion opposed to the connecting pad, the protruded portion formed to take a conical shape having a rounded tip part such that a diameter of the protruded portion gradually decreases from a base part of the protruded portion to the tip part of the protruded portion opposed to the connecting pad;
a first taper portion which is formed between the head portion and a base part of the shaft portion, said first taper portion tapering outwardly from the base part of the shaft portion toward an outer edge of the head portion; and
a second taper portion which is formed between the head portion and the base part of the protruded portion, wherein the protruded portion projects from the second taper portion such that the base part of the protruded portion is provided at an angle relative to the second taper portion.
9. The wiring board having a lead pin according to claim 1, wherein an external surface of the protruded portion and the head portion are smoothly connected to each other through a continuous curved surface.
10. The wiring board having a lead pin according to claim 8, wherein an external surface of the protruded portion and the head portion are smoothly connected to each other through a continuous curved surface.
11. A lead pin bonded through a conductive material to a connecting pad formed on a wiring board, comprising:
a shaft portion;
a head portion which is provided on one end of the shaft portion, said head portion having a diameter greater than that of the shaft portion;
a protruded portion which is formed on a surface side of the head portion opposed to the connection pad, the protruded portion formed to take a hemispherical shape which is convexed toward the connecting pad, the hemispherical shaped protruded portion having a diameter which is less than the diameter of the head portion;
a first taper portion which is formed between the head portion and a base part of the shaft portion, said first taper portion tapering outwardly from the base part of the shaft portion toward an outer edge of the head portion; and
a second taper portion formed between the head portion and a base part of the protruded portion, wherein the base part of the protruded portion is provided at an angle relative to the second taper portion.
12. The lead pin according to claim 11, wherein a planer shape of the head portion is formed in a circular flat plate manner, and the protruded portion is concentric with the shaft portion and is protruded from the head portion.
13. The lead pin according to claim 11, wherein each of the first and second taper portions take such a shape as to divide the head portion into two parts in a vertical direction.
14. The lead pin according to claim 11, wherein a trench is formed from the base part of the protruded portion to an outer peripheral edge of the head portion.
15. The lead pin according to claim 11, wherein a trench is formed in a communicating arrangement between the protruded portion and an outer peripheral edge of the head portion.
16. The lead pin according to claim 11, wherein an external surface of the protruded portion and the head portion are smoothly connected to each other through a continuous curved surface.
17. The lead pin according to claim 11, wherein the first taper portion tapers extends at a non-perpendicular angle from the shaft portion toward the outer edge of the head portion.
18. The lead pin according to claim 11, wherein the head portion has a cylindrical shape.
19. A lead pin bonded through a conductive material to a connecting pad formed on a wiring board, comprising:
a shaft portion;
a head portion which is provided on one end of the shaft portion, said head portion having a diameter greater than that of the shaft portion;
a protruded portion which is formed on a surface side of the head portion opposed to the connection pad, the protruded portion formed to take a conical shape having a rounded tip part such that a diameter of the protruded portion gradually decreases from a base part of the protruded portion to the tip part of the protruded portion opposed to the connecting pad;
a first taper portion which is formed between the head portion and a base part of the shaft portion, said first taper portion tapering outwardly from the base part of the shaft portion toward an outer edge of the head portion; and
a second taper portion is formed between the head portion and the base part of the protruded portion, and the protruded portion projects from the second taper portion such that the base part of the protruded portion is provided at an angle relative to the second taper portion.
20. The lead pin according to claim 19, wherein an external surface of the protruded portion and the head portion are smoothly connected to each other through a continuous curved surface.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for detecting leaks in a diesel engine comprising:
connecting a nozzle of a leak testing device to a threaded inlet of the engine, the threaded inlet in fluid communication with a high pressure oil cavity of the engine;
connecting a hose in fluid communication with the nozzle to a pressurized air source;
pressurizing the engine with pressurized air from the pressurized air source;
listening for an audible sound identifying the pressurized air leaking from the engine; and
identifying a location of the leaking based on the audible sound from the engine.
2. The method according to claim 1, wherein the threaded inlet comprises a port configured to connect a high pressure regulator to the engine.
3. The method according to claim 2, wherein the port corresponds to a high pressure oil pump aperture.
4. The method according to claim 1, wherein the location is identified as a source from which the audible sound is emanating based on a volume of the audible sound.
5. The method according to claim 1, further comprising:
ensuring that a valve of the leak testing device is in a closed position prior to connecting the hose to the pressurized air source.
6. The method according to claim 5, further comprising:
pressurizing the engine by slowly opening the valve to pressurize the engine.
7. The method according to claim 1, wherein the pressurized air corresponds to atmospheric air.
8. A method for identifying leaks in an engine oil system comprising:
connecting a nozzle of a testing device to an oil pump inlet of the engine, wherein the oil pump inlet is in fluid communication with an oil cavity of the engine;
inputting air into the oil cavity through an internal passage of the nozzle;
pressurizing the engine with the air from the internal passage of the nozzle;
identifying a location of a leak emanating from a portion of the engine in fluid communication with the oil cavity based on a sound emitted from the engine.
9. The method according to claim 8, wherein the pressurizing the engine is initiated by opening a valve of the leak testing device.
10. The method according to claim 8, wherein the connecting of the nozzle comprises threading a threaded portion of the nozzle into a threaded inlet corresponding to the oil pump inlet.
11. The method according to claim 10, wherein the threaded portion of the nozzle and the threaded inlet form a sealed connection in an assembled configuration.
12. The method according to claim 8, further comprising:
supplying the air from a high pressure air source through the internal passage of the nozzle to input the air into the oil cavity.
13. The method according to claim 8, wherein the high pressure air source corresponds to an air supply having a pressure approximately greater than or equal to 100 pounds per square inch.
14. The method according to claim 8, further comprising:
accessing the oil pump inlet by removing a pressure regulator from the oil pump inlet.
15. The method according to claim 14, further comprising:
removing a fuel injection control module to access the pressure regulator.
16. A leak testing apparatus for a diesel engine comprising:
a first end portion forming a cylindrical opening configured to output air from a pressurized air source;
a second end portion forming a threaded inlet configured to form a sealed connection with a fitting, the fitting configured to connect to the pressurized air source;
an internal passage formed between the threaded inlet and the cylindrical opening, the internal passage configured to communicate the air from the second end portion to the first end portion; and
an engaging surface formed by the first end portion, wherein the first end portion is configured to sealably engage an oil pump inlet of the diesel engine.
17. The leak testing apparatus according to claim 16, wherein the engaging surface comprises a smooth shaft portion and a threaded portion.
18. The leak testing apparatus according to claim 17, wherein the threaded portion is configured to engage the oil pump inlet.
19. The leak testing apparatus according to claim 17, further comprising a first seal secured to a channel portion formed on the engaging surface proximate the cylindrical opening.
20. The leak testing apparatus according to claim 19, further comprising a second seal disposed between the threaded portion and a hexagonal profile section of the apparatus.