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US 5,992,944 AGranted
Pump devices
AssigneeUnisia Jecs Corporation
InventorMasahiko Hara
Life of this patent
Estimating the term…
Abstract
A pump device includes main and auxiliary eccentric portions integrated with a motor output shaft on the side of its base end and on the side of its pointed end. The main eccentric portion is larger in diameter than the auxiliary eccentric portion. A needle roller bearing and a ball bearing are fitted to the outer peripheries of the eccentric portions. Main and auxiliary pumps include a pair of plungers which abut on the outer peripheries of the bearings, respectively, and are driven by the main and auxiliary eccentric portions.
Claims7
A pump device driven by a motor with an output shaft, comprising:
- first and second eccentric portions integrated with the output shaft on the side adjacent to the motor and on the side distant therefrom, said first eccentric portion being larger in diameter than said second eccentric portion;
- first and second bearings fitted to outer peripheries of said first and second eccentric portions;
- and
- first and second pumps including first and second plungers, said first and second plungers abutting on said outer peripheries of said first and second bearings, said first and second pumps being driven by said first and second eccentric portions.
1 more element
Dependencies are inferred from the claim text.