Document Type and Number:
Japanese Patent JPS6330506
Kind Code:
B2
Abstract:
An engine driven vacuum pump combining a two-stage, low noise demountable pump assembly with a camshaft driven eccentric drive arrangement having internal oil distribution and pumping means for lubricating the drive and pump pushrod elements. A check valve in the cover of the pump assembly defines a second stage pumping chamber which increases pump efficiency while at the same time cyclically closing the pump outlet to reduce external noise attributable to gas discharge from the primary pumping chamber.
Inventors:
TOOMASU DABURYU UEISUGAABAA
BURAIAN KEE NERUSON
RICHAADO PII RIIFUERU
BURAIAN KEE NERUSON
RICHAADO PII RIIFUERU
Application Number:
JP10984378A
Publication Date:
June 17, 1988
Filing Date:
September 08, 1978
Export Citation:
Assignee:
GEN MOTORS CORP
International Classes:
F04B45/04; F02B67/04; F04B25/00; F04B35/00; F04B37/16; F04B39/00; F04B39/02; F04B39/04; F02B1/04