Pumps – Reverse flow with unidirectional drive or unidirectional...
Reexamination Certificate
2000-04-24
2001-11-20
Koczo, Michael (Department: 3746)
Pumps
Reverse flow with unidirectional drive or unidirectional...
C285S205000, C417S500000
Reexamination Certificate
active
06318974
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an oil pump for separate lubrication for supplying a lubricating oil to an automobile, a motor bicycle, a snowmobile, etc., and particularly relates to a compact reversible oil pump suitable for the snowmobile.
2. Description of the Background Art
The present applicant proposed a reversible oil pump in Japanese Patent Application No. 10-64286. This reversible oil pump is a lubricating oil pump with the rotation of an engine as a pump driving source and can be applied to a 2-cycle engine such as a snowmobile, etc. having no back gear. In this reversible oil pump, a cylinder is rotatably arranged in a cylindrical space formed in a pump body, and a worm wheel engaged with a driving worm is integrally formed in a plunger arranged in a pump chamber of this cylinder such that the plunger can freely go in and out of the pump chamber. A lead cam arranged in the worm wheel comes in press contact with a discharging amount setting cam. The worm wheel and the cylinder are engaged with each other with play.
A pump action is taken by making the plunger go in and out of the pump chamber of the cylinder. An oil is discharged or sucked from an inlet-outlet path communicated with the pump chamber and opened to a cylinder circumferential face to an outlet hole or an inlet hole arranged in the pump body. Since the worm wheel and the cylinder are engaged with each other with play, the relation of a rotating position of the cylinder and going in and out timings of the pump chamber of the cylinder is changed by a rotating direction of the worm wheel, and the oil is sucked from the inlet hole of the pump body and is discharged from the outlet hole in the rotation in any direction. Namely, the pump is set to be reversibly rotated.
In the above reversible oil pump, the plunger goes in and out of the pump chamber from an arranging side of the driving worm. Accordingly, the plunger is arranged between the outlet hole of the pump body and the driving worm so that a problem exists in that the outlet hole is separated from the driving worm and the pump is large-sized.
In a proposal described in Japanese Laid-Open (Kokai) Patent No. 8-270890 with respect to a nipple of the oil pump for separate lubrication, an engaging claw is arranged in a portion in which a nipple body made of synthetic resin is inserted into the pump body. The engaging claw is engaged with a step difference portion of an outlet port of the pump body. A noncircular inner circumferential face of a direction holding member engaged with the pump body is fitted to a noncircular outer circumferential face of the nipple body to stop rotation of the nipple body.
In the above nipple of the oil pump for separate lubrication, the step difference portion engaged with the engaging claw is arranged in the outlet port of the pump body so that boring processing is required and manufacturing cost is increased. Further, since a portion inserted into a hose for supplying the oil to the engine is thin, a problem exists in that this portion is easily broken when this portion is formed by synthetic resin.
SUMMARY OF THE INVENTION
In consideration of the above problems, an object of the present invention is to provide an oil pump for separate lubrication in which the oil pump can be made compact and manufacturing cost is low and no nipple is easily broken.
In an oil pump for separate lubrication in the present invention, a distributor is fitted to a cylinder arranged in a pump body so as to be rotated and moved in an axial direction; a plunger is fitted to a pump chamber arranged in said distributor so as to go in and out of the pump chamber; a shaft arranged on a side opposed to the pump chamber of said distributor is covered with a worm wheel engaged with a driving worm, and a pin press-fitted into said shaft is engaged with a concave portion formed in said worm wheel with play; a lead cam arranged in said worm wheel comes in press contact with a discharging amount setting cam and said plunger comes in press contact with a cover for closing said cylinder by a spring interposed between said distributor and the plunger; an inlet-outlet path communicated with said pump chamber and opened to a circumferential face of the distributor is arranged in said distributor; and an outlet hole and an inlet hole conforming to an opening portion of said inlet-outlet path in a position in the axial direction of the cylinder are arranged in said pump body.
In the above oil pump for separate lubrication, a nipple for connection to a hose for supplying an oil to an engine is fitted to a nipple fitting hole of the pump body communicated with said outlet hole of the oil pump for separate lubrication; said nipple is constructed such that a metallic pipe connected to the hose is adhered to a side face of a nipple body made of resin; a basic end portion of said nipple body is covered with an O-ring and the O-ring is inserted into said fitting hole; and a nipple fixing plate fitted to a groove formed in a head portion of said nipple body and pressing the nipple body is fastened and attached to the pump body.
REFERENCES:
patent: 3101057 (1963-08-01), Heiser
patent: 4231716 (1980-11-01), Kubota et al.
patent: 4452128 (1984-06-01), Stoll
patent: 4787832 (1988-11-01), Fukasawa et al.
patent: 4797073 (1989-01-01), Kubota et al.
patent: 4904163 (1990-02-01), Tachi et al.
patent: 5370507 (1994-12-01), Dunn et al.
patent: 8-270890 (1996-10-01), None
Itoh Hisanori
Kubota Kenichi
Koczo Michael
Ladas & Parry
Mikuni Adec Corporation
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