Metal working – Method of mechanical manufacture – Gear making
Patent
1995-10-05
1997-07-15
Echols, P. W
Metal working
Method of mechanical manufacture
Gear making
29893, 74446, B21D 2800
Patent
active
056471254
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
This invention relates to a process for manufacturing a drive plate having a plate integrally secured on an inner circumference thereof.
BACKGROUND ART
A drive plate meshes with a pinion gear securely set on a rotary shaft of a starter motor to start an internal combustion engine.
A conventional process for manufacturing a drive plate is as follows:
A flat bar material is curled, both of its ends are subjected to a flash butt welding, and its interior and exterior surfaces and its both surfaces are cut with a single purpose machine and a lathe to manufacture an annular gear blank. The annular gear blank is subjected to a gear cutting with a hobbing machine then a chamfering to manufacture an annular gear. A plate is pressed on an inner circumference of the annular gear. Electric weldings are performed on ten to twelve portions of the plate, each portion having approximately 15-25 mm to manufacture a drive plate.
According to such a manufacturing process, a series of processes for manufacturing an annular gear from a flat bar comprise a cutting, a gear cutting, a chamfering, and electric welding, which result in a long manufacturing time. Thus, an object of the present invention is to provide a process for manufacturing a drive plate, which process eliminates a cutting and a chamfering process to shorten a manufacturing time.
Another object of the present invention is to provide a process for manufacturing a drive plate, which process can reduce frictional resistance between a female die and a workpiece to elongate a useful life of a die.
A further object of the present invention is to provide a process for manufacturing a drive plate, which process can securely connect a plate to an annular gear.
SUMMARY
According to a process for manufacturing a drive plate of the present invention, a die forging process employs a female die having a chamfer of 20.degree.-50.degree. on an inlet inner circumference thereof and a fine polished tooth profile sliding on an annular workpiece. Thus, friction resistance between the female die and the annular workpiece at the inlet is reduced and an arc-shaped surface is formed at the ends of tooth profiles of the annular workpiece. After the trimming operation, multiple projections formed on an inner circumference of the annular workpiece of the female die are inserted into caulking holes provided in a disc plate and the disc plate is securely provided on the inner circumference of the annular workpiece. The projections are pressed by a punch, so that a drive plate is manufactured, the drive plate having the disc plate securely provided in the annular gear.
According to the process for manufacturing a drive plate, a press working can be performed to manufacture a drive plate without a cutting and an electric welding, which contributes to a cost reduction. Further, the manufacturing process employs the female die having the fine polished tooth profiles with the chamfers of 20-1500 provided at the inlet of the female die. Therefore, a frictional resistance between the female die and the annular workpiece is reduced, so that the useful span of life a die set, such as the female die, extends, which leads to reduction of a manufacturing cost.
Further, according to the process for manufacturing the drive plate, the die forging press consists of two processes and the chamfer provided on the inlet circumference of the female die used in a first die forging process has a larger angle than that provided on the inlet circumference of the female die used in a second die forging process.
Thus, a frictional resistance between the annular workpiece and the female die can be further reduced and the useful life span of the female die can be further extended.
Further, according to the process for manufacturing the drive plate, the hole is shaped into an oval, a star, or a cross. Thus, a material flow occurring in a pressing operation enables a more secure pressing operation. Further, even if a vibration and an impact act on the drive plate, the annular workpiece and the
REFERENCES:
patent: 2162902 (1939-06-01), Adams
patent: 4692294 (1987-09-01), Fisher, III et al.
Echols P. W
Kabusiki Kaisha IPC
Ohashi Technica, Inc.
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