The invention relates to a fuel pump assembly for a motor vehicle, which can be upstream of a fuel pump of the motor vehicle in a fuel line of the motor vehicle, having a pump housing and a pump device arranged thereupon, by means of which fuel can be pumped into and/or through the pump housing when
The invention relates to a fuel pump assembly for a motor vehicle, which can be upstream of a fuel pump of the motor vehicle in a fuel line of the motor vehicle, having a pump housing and a pump device arranged thereupon, by means of which fuel can be pumped into and/or through the pump housing when the pump device is in the active state thereof, wherein the pump device has at least one stroke piston pump having an inlet valve and an outlet valve which are opened and closed in alternation by pressure activation when the pump device is active. In order to provide a fuel pump assembly which enables a very energy efficient operation of a motor vehicle thereby equipped, according to the invention the inlet valve and the outlet valve are held in the open positions thereof when the pump device is inactive.
대표청구항▼
1. A fuel pump assembly for a motor vehicle that can be connected upstream from a fuel pump of the motor vehicle in a fuel line of the motor vehicle, comprising: a pump housing and a pump device situated thereon with which fuel can be pumped at least one of into or through the pump housing when the
1. A fuel pump assembly for a motor vehicle that can be connected upstream from a fuel pump of the motor vehicle in a fuel line of the motor vehicle, comprising: a pump housing and a pump device situated thereon with which fuel can be pumped at least one of into or through the pump housing when the pump device is in its active state,the pump device comprising at least one stroke piston pump having an inlet valve and an outlet valve that are alternately opened and closed by pressure actuation when the pump device is active, such that when the inlet valve is open, the outlet valve is closed, andthe inlet valve is provided on a piston of the stroke piston pump,wherein the inlet valve and the outlet valve are each held in their open positions when the pump device is inactive in such a way that fuel that is pumped by the fuel pump of the motor vehicle through the pump housing of the fuel pump assembly does not have to open any valve of the fuel pump assembly. 2. The fuel pump assembly as recited in claim 1, wherein the piston of the stroke piston pump forms the valve body of the inlet valve. 3. The fuel pump assembly as recited in claim 2, wherein the piston has a rigidly fashioned supporting plate and has a support that is situated on a lower side thereof, made of an elastic material, and that forms a circumferential sealing lip. 4. The fuel pump assembly as recited in claim 1, wherein the stroke piston pump has a cylinder and a piston rod situated so as to be axially movable therein, on which piston rod the piston is situated, the piston releasing a through-opening between itself and the cylinder when the pump device is inactive, one of the piston and the piston rod holding a valve body of the outlet valve in its open position when the pump device is inactive, and the valve body of the outlet valve being situated in the pump housing so as to be movable in the direction of a longitudinal axis of the piston rod. 5. The fuel pump assembly as recited in claim 4, wherein the piston rod has, at its end at the piston, an actuating extension that protrudes axially past the piston, via which the piston rod can be brought into contact with the valve body of the outlet valve. 6. The fuel pump assembly as recited in claim 4, wherein at an end of the cylinder facing the outlet valve there is situated a sleeve that forms the valve seat of the outlet valve and is oriented coaxially to the cylinder, on which sleeve there is fastened a counter-bearing, a pressure spring being situated between the counter-bearing and the valve body of the outlet valve, which pressure spring applies force to the valve body in the direction of its closing position. 7. The fuel pump assembly as recited in claim 6, wherein the counter-bearing is the base of a liquid-permeable cage that is situated on the sleeve, coaxial to the cylinder. 8. The fuel pump assembly as recited in claim 7, wherein the cage is connected to the sleeve via a locking connection. 9. The fuel pump assembly as recited in claim 1, including a filter element that is situated in the pump housing and is connected downstream from the pump device, for the filtering of fuel pumped by the pump device. 10. The fuel pump assembly as recited in claim 6, including a filter element that is situated in the pump housing and is connected downstream from the pump device, for the filtering of fuel pumped by the pump device, wherein on the outer side of the sleeve there is situated a circumferential collar that stands in contact with an end face of the filter element.
Eberl ; deceased Leonhard (late of Unterschleissheim DEX by Anna Eberl ; Robert L. F. Eberl ; heirs) Mielich Karl (Baldham DEX) Mozes Miklos (Munich DEX) Schmid Walter (Munich DEX) Stieninger Klaus (, Hand-actuatable pump for feed pumps of fuel injection systems for internal combustion engines.
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