DE431901C - Multi-cylinder controllable fuel pump for multi-cylinder oil machines - Google Patents

Description

GERMAN EMPIRE

ISSUED ON 23 JULY 1926

REICH PATENT OFFICE

PATENT LETTERING

CLASS 46 b 2 GROUP

(M87950 Ij4ßb ^z )

Machine factory Eßlingen in Eßlingen *).

The regulation of the multi-cylinder fuel pumps of multi-cylinder oil machines occurs in the previously known designs in such a way that the funding * - amount of each individual pump by lifting the suction valve for a longer or shorter period of time or influenced by the controller by adjusting another automatic control element will. _ This arrangement requires

ίο a larger number of cylinders, multi-part control devices and makes both the setting more difficult of each individual pump, as well as the even distribution of the work performance on all cylinders. There are already Proposals have become known, according to which the regulation by a common to all pumps, the overflow valve adjusted by the controller is to take place after the suction chamber; the previous arrangements of this kind, however, offered

so likewise no possibility of an exact one Adjustment and even distribution of fuel delivery to all pumps or cylinder.

The subject of the invention is a fuel _{pump in which the regulation of the a} g of all odex pumps of a machine set combined in a block by thick-walled pipelines is carried out by adjusting a single throttle element by the controller, with an even distribution of the pump delivery to all cylinders being ensured at the same time. This is achieved in that each individual: fuel pump is on the one hand connected in a known manner via a pressure valve to the injection line or the combustion chamber, and on the other hand is connected by a further pressure valve to a pressure control chamber common to all pumps, which is connected to the suction chamber of the via a throttle valve Pumping is connected. The pressure valves leading to the combustion chamber are under a. Spring load corresponding to the desired injection pressure; on the other hand, the valves leading to the pressure regulating chamber are loaded correspondingly less, so that

*) The patent seeker stated as the inventor:

Paul Mühleisen in Esslingen.

Claims (2)

they open first at the start of delivery of each pump piston and fuel after the pressure regulating chamber. Depending on the setting "of the throttle device sooner or later the pressure in this space will reach the injection pressure, whereupon With further promotion the injection pressure valve is opened and the fuel in the Cylinder is injected. This process ίο is repeated with every single pump stroke. Since the limit pressure in the pressure regulating chamber is the same for all pumps, there is also one Even distribution of the fuel delivery and thus the power to all cylinders ensured. The accompanying figures show schematically an embodiment in application to a four-cylinder engine in elevation and plan. The pump pistons α , controlled by cam disks, suck in fuel from the fuel collection chamber during their upward movement through the suction valves b; When the piston goes down, the sucked-in fuel is first pushed through the pressure valves C ₁ or c ₂ , C ₃ , C ₄ to the pressure regulating chamber d , which is connected to the suction chamber through the throttle valve and the line /. When the pressure in space d reaches the level of the injection pressure, the pressure valve g is opened as the pump continues to deliver, through which the fuel is pressed into the injection line A and from here into the cylinder. Depending on the opening width of the valve e set by the speed regulator with the help of the "shaft i " provided with a flat screw thread, the pressure in the room will sooner or later reach the level of the injection pressure, whereby the time of the start of injection and thus the duration of the injection can be changed. PATENT-AnP ¹¹ RTJCHE: i. Multi-cylinder controllable fuel pump for multi-cylinder oil machines, in which each working cylinder is assigned a special pump piston with suction and pressure valve, while the delivery rate is set by a control element common to all pumps, characterized in that a throttle valve (s) is used as the control element, which over a common pressure regulating chamber (d) and overflow valves (c) are connected to the working chambers (b) of the fuel pump cylinder, and that the pressure valves (g) leading to the working cylinder are only opened automatically when the pressure in the pressure regulating chamber (d) has reached a certain level Has reached height. 2. Fuel pump according to claim 1, characterized in that each pump displacement is connected on the one hand by the usual "pressure valve (g-) to the injection line, on the other hand by a further additional pressure valve (c) to the pressure control chamber (d), which is connected via the throttle element ( e) is in communication with the suction chamber. h Srennsto f fdrealeftami to the cylinder