Method of making an oil seal having two lips formed by splitting

Details Method of making an oil seal having two lips formed by splitting Method of making an oil seal having two lips formed by splitting

1991-01-07

1992-01-21

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

264154, 264156, 264163, 264262, 264266, 264268, 425DIG47, B29C 4318

Patent

active

050826123

ABSTRACT:
A method of making an oil seal (10) having two separate annular lips (62, 64) formed by splitting a single lip liner blank (12). The lip liner blank is an annular wafer having an annular groove (14) formed on one side (15) of the wafer at the point on the wafer where the wafer is intended to be split into two annular pieces (49, 50). A mold (32) is loaded with the lip liner blank (12), a prep ring of elastomeric material (43) and a seal case (b 44) and then closed thereby clamping the prep ring and wafer between upper and lower dies (40 and 36) of the mold. In the molding step the prep ring and wafer are heated and compressed causing the prep ring to become molten as it flows over the wafer. The molten elastomeric material enters the groove and pressure exerted by the elastomeric material against the groove splits the wafer into two annular pieces (49, 50). A first annular piece (49) is displaced in the mold to the desired location of the excluder lip (64). A second annular piece of the wafer lines the main lip (62) of the oil seal (10).

REFERENCES:
patent: 3443845 (1969-05-01), Walchle et al.
patent: 4171561 (1979-10-01), Bainard et al.
patent: 4464322 (1984-08-01), Butler
patent: 4613143 (1986-09-01), Butler

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