Hydraulic pump unit
First Claim
1. A hydraulic pump unit (1) for supplying fuel to an internal combustion engine, comprising:
- a plurality of pump elements (2), disposed in one plane, each of which has one pump cylinder (3) and one pump piston (4) longitudinally displaceably in the pump cylinder (3), and whose longitudinal axes (5) intersect at a common intersection point (6);
a cam drive with cams (10), which upon a rotation of the cam drive relative to the pump elements (2) act upon the pump pistons (4) with an actuation motion, the number and the angular spacing of the cams (10) being adapted to the number and angular spacing of the pump elements (2) in such a way that when a certain number of pump pistons (4) are located at top dead center (TDC), the same number of pump pistons (4) are at bottom dead center (BDC);
the pump elements (2) of the pump unit (1) receiving the fuel from a metering unit (14); and
the pumping courses of the individual pump elements (2) having no overlaps.
1 Assignment
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Accused Products
Abstract
The invention relates to a hydraulic pump unit having a plurality of pump elements, disposed in one plane, each of which has one pump cylinder and one pump piston longitudinally displaceable in the pump cylinder, and whose longitudinal axes intersect at a common intersection point, and having a cam drive with cams, which upon a rotation of the cam drive relative to the pump elements act upon the pump pistons with an actuating motion. To enable a uniform pumping of the hydraulic fluid and to make a high degree of smoothness of the hydraulic pump unit possible, it is proposed that the number and the angular spacing of the cams is adapted to the number and angular spacing of the pump elements in such a way that when a certain number of pump pistons are located at top dead center, the same number of pump pistons are at bottom dead center.
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Citations
20 Claims
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1. A hydraulic pump unit (1) for supplying fuel to an internal combustion engine, comprising:
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a plurality of pump elements (2), disposed in one plane, each of which has one pump cylinder (3) and one pump piston (4) longitudinally displaceably in the pump cylinder (3), and whose longitudinal axes (5) intersect at a common intersection point (6);
a cam drive with cams (10), which upon a rotation of the cam drive relative to the pump elements (2) act upon the pump pistons (4) with an actuation motion, the number and the angular spacing of the cams (10) being adapted to the number and angular spacing of the pump elements (2) in such a way that when a certain number of pump pistons (4) are located at top dead center (TDC), the same number of pump pistons (4) are at bottom dead center (BDC);
the pump elements (2) of the pump unit (1) receiving the fuel from a metering unit (14); and
the pumping courses of the individual pump elements (2) having no overlaps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A high pressure pump (18) for generating an injection pressure for fuel-operated internal combustion engines, comprising a plurality of hydraulic pump units (1), each said pump unit (1) including:
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a plurality of pump elements (2), disposed in one plane, each of which has one pump cylinder (3) and one pump piston (4) longitudinally displaceable in the pump cylinder (3), and whose longitudinal axes (5) intersect at a common intersection point (6);
a cam drive with cams (10), which upon a rotation of the cam drive relative to the pump elements (2) act upon the pump pistons (4) which an actuation motion, the number and the angular spacing of the cams (10) being adapted to the number and angular spacing of the pump elements (2) in such a way that when a certain number of pump pistons (4) are located at top dead center (TDC), the same number of pump pistons (4) are at bottom dead center (BDC);
the pump elements (2) of the pump unit (1) receiving the fuel from a metering unit (14);
the pumping courses of the individual pump elements (2) having no overlaps; and
said pump units (1) being disposed one behind the other in such a way that the planes in which the pump units (1) are located extend parallel to one another, and that the intersection points (6) of the hydraulic pump units (1) are located on the same camshaft (9) and that the pump elements (2) of all the hydraulic pump units (1) are acted upon with an actuating motion by the same cam drive. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification