Internal-gear pump
AssigneeRobert Bosch GmbH
InventorStanislaw Bodzak
Life of this patent
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Abstract
The invention relates to an internal-gear pump for pumping fuel in an internal combustion engine, having an internal-toothed annular gear (11) and an external-toothed pinion (3) that cooperates with the annular gear (11) to generate a pumping action. To increase the pump capacity at starting rpm and to lengthen the service life of the internal-gear pump, the pinion (3) is supported radially movably, eccentrically to the annular gear (11), on a bearing journal (5). Moreover, a device (12) is provided in order to compensate for the radial play (R) between the pinion (3) and the annular gear (11).
Claims10
An internal-gear pump for pumping fuel in an internal combustion engine, having an internal-toothed annular gear (11) and an external-toothed pinion (3) that cooperates with the annular gear (11) to generate a pumping action, characterized in that the pinion (3) is supported radially movably, eccentrically to the annular gear (11), on a bearing journal (5), and that a device (12) is provided in order to compensate for the radial play (R) between the pinion (3) and the annular gear (11), especially upon starting of the engine.
The internal-gear pump of one of the foregoing claims, characterized in that the device is formed by a leaf spring (12) with two legs (31, 32) disposed essentially at right angles to one another, one leg (31) being disposed on the face end of the bearing journal (5) and the other leg (32) being disposed between the bearing journal (5) and a bearing bush (4) for the pinion (3).
The internal-gear pump of one of the foregoing claims, characterized in that a stop (23) for the bearing bush (4) is embodied on the bearing journal (5).
The internal-gear pump of one of the foregoing claims, characterized in that the pinion (3) is coupled to a drive shaft (21) by an Oldham coupling (22) or a radially elastic coupling.
Dependencies are inferred from the claim text.