High-pressure fuel pump
A high-pressure fuel pump, low-pressure technology, which is applied to fuel injection pumps, fuel injection devices, liquid fuel engines, etc., can solve problems such as increasing manufacturing costs, and achieve cost savings in construction and manufacturing, compact structure, and good achievability. Effect
Inactive Publication Date: 2010-12-01
ROBERT BOSCH GMBH
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Problems solved by technology
[0003] The disadvantage of this known technology is that when using such a high-pressure fuel pump for an internal combustion engine with 4 cylinders, two pump pistons, a further pump housing will be used for economical reasons, wherein the two pump pistons will Arranged oppositely around the pump camshaft
The use of a different pump housing would lead to increased manufacturing costs, since an additional manufacturing tool would have to be used compared to the pump housing of a three-cylinder high-pressure fuel pump
Method used
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Embodiment Construction
[0012] The high-pressure fuel pump comprises a pump housing 1 on which two pump cylinder heads 2 a and 2 b are arranged at an angle of 120° to one another. In each of the two pump heads 2 a and 2 b are guided pump pistons 3 a and 3 b , which come into contact with a common polygonal configuration 4 of the pump camshaft 5 in the center of the pump housing 1 . Furthermore, the suction valves 7a and 7b in the pump heads 2a and 2b supply the corresponding pump pistons 3a and 3b with fuel at low pressure via the low-pressure feed channels 6a and 6b. The suction valves 7a and 7b in turn fill the pressure chambers 8a and 8b arranged above the pump pistons 3a and 3b with fuel. The low-voltage supply channels 6 a and 6 b are connected on the other side to the groove 9 of a low-voltage block 10 . In the area of the tank 9 there is a metering unit 11 which is supplied with fuel under low pressure via a low-pressure connection 12 by a delivery pump not shown and which doses the fuel de...
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The invention relates to a high-pressure fuel pump for operating an internal combustion engine, comprising a pump housing (1) and two pump cylinder heads (2a, 2b) attached thereto, in which a pump piston (3a, 3b) for compressing fuel under low pressure is guided from a low-pressure inlet (6a, 6b) into a pressure chamber (8a, 8b) at high pressure and for delivery of the fuel to a high-pressure connection (13a, 13b) of a high-pressure storage, wherein the two pump pistons (3a, 3b) can be operated via a common polygonal configuration (4) of a pump cam shaft (5), wherein the two pump cylinder heads (2a, 2b) are further attached on the pump housing (1) such that the two pump pistons (3a, 3b) are positioned at an angle of 120 DEG to each other.
Description
technical field [0001] The invention relates to a high-pressure fuel pump for the operation of an internal combustion engine, which consists of a pump housing and two pump cylinder heads mounted on the pump housing, in which a pump piston is guided in each case in order to receive fuel from each The fuel at low pressure in the low-pressure supply channel is compressed to high pressure in each of the high-pressure chambers and delivered to the high-pressure connection of the high-pressure accumulator, wherein the two pump pistons can be moved via a common polygonal configuration of a pump camshaft drive. Background technique [0002] Such a high-pressure fuel pump is known from DE 196 35 164 A1, which consists of a separate pump housing in which three guided pump pistons are driven via a common polygon of the pump camshaft. Here, the pump pistons are each arranged at an angle of 120° relative to one another, and the fuel from the low-pressure feed channel is compressed to hi...
Claims
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IPC IPC(8): F02M39/02F02M59/06F04B1/04F04B53/16F02M55/00
CPCF02M59/06F04B53/16F04B1/0404F02M55/00
Inventor J·沃尔高F·伯金
Owner ROBERT BOSCH GMBH