Mounting and connection arrangement for a fuel injection pump

#The invention relates to a mounting and connection arrangement for a fuel injection pump in large reciprocating internal combustion engines, especially in large diesel engines with several cylinders, which include a separate injection pump for separate cylinders and in which the injection pump is supported to a console support or to a corresponding element forming an integral part of or fixed to the engine block.

#In large engines injection pumps are generally located on a special pump console support extending along the engine block. A console support can be an integral part of the engine block but also a separate element fixed thereto. It can also with advantage be covered so as to form a box-like member for protecting the pumps, pipes and possible other devices arranged on it. The term "large diesel engine" as used herein refers to a diesel engine that is applicable for use as a main propulsion engine or auxiliary engine for a ship or in a heating power plant etc..

#In known solutions fuel is led to the injection pipes and the excessive fuel, respectively, is returned for recirculation through separate pipes included in the fuel feeding system of the engine. Pressure peaks from the fuel pump operating under high pressure cause strain, cracks and wear in the fuel pipes and especially in the sealing positions. This has resulted in using thick walled pipes which are allowed to move supported by the sealings of a distribution housing included in the fuel feeding system of the engine. Alternatively the pumps are connected to the distribution pipes with thinner pipes by making use of flange joints. The sealings of the distribution housing wear out rather quickly causing leakage problems. On the other hand the thinner pipes connected to the distribution pipes can break at the welded spots due to pressure shocks and stresses, which are at their very biggest at the immediate vicinity of the pump.

#The invention will now be further described with reference to the accompanying drawing, in which

#FIG. 1 shows as a side view and partly in section an arrangement according to the invention, in which two support units for injection pumps are attached to each other,

#FIG. 2 shows the arrangement of FIG. 1 viewed from above,

#In the drawing the reference numeral 1 indicates a fuel injection pump, which comprises a cover member 1a and a body member 1b. The body member 1b includes a cylinder 12 and inside it a reciprocatingly movable piston member 6 arranged to feed fuel, through its movement, with high pressure further into a cylinder of an internal combustion engine, which is known as such and therefore not shown more in detail in the figures. The injection pump 1 is by means of a support unit 2 fixed to a pump console support 3, which can be an integral part of the engine block or a separate part fixed thereto. Fixing can be accomplished by means of bolts, for which purpose the support unit 2 includes holes 16.

#In the embodiment according to FIGS. 1-3 the body member 1b of the injection pump and the support unit 2 form one integral body. The support unit 2 includes a first channel arrangement 7, which is connectable to the pipes of the fuel feeding system of the engine for feeding fuel via channels 7a and 7b into the pump cylinder 12. In addition the support unit includes a second channel arrangement 8, 8a and 8b for leading excessive fuel away from the pump back into the fuel feeding system for recirculation. The channels 7 and 8 of the support unit are connected to the fuel feeding system by making use of flange arrangements 15.

#The support unit 2 includes further as an integral part thereof guiding means 4 arranged for lifting arms 5 for suction and/or discharge valves of an engine cylinder. In accordance with the embodiments shown in the figures said guiding means 4 comprise guiding cylinders, through which the lifting arms 5 are led through the pump console support 3 and by means of which, at the same time, the lifting arms 5 are movably supported to the pump console support 3.