RU2554151C1 - Diesel engine fuel system - Google Patents

Diesel engine fuel system Download PDF

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Publication number
RU2554151C1
RU2554151C1 RU2014120200/06A RU2014120200A RU2554151C1 RU 2554151 C1 RU2554151 C1 RU 2554151C1 RU 2014120200/06 A RU2014120200/06 A RU 2014120200/06A RU 2014120200 A RU2014120200 A RU 2014120200A RU 2554151 C1 RU2554151 C1 RU 2554151C1
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RU
Russia
Prior art keywords
fuel
located
engine
multiplier
piston
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Application number
RU2014120200/06A
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Russian (ru)
Inventor
Александр Владимирович Глатерман
Артем Геннадьевич Ветошников
Андрей Аминодович Никитин
Георг Георгович Тер-Мкртичьян
Original Assignee
Федеральное государственное унитарное предприятие "Центральный ордена Трудового Красного Знамени научно-исследовательский автомобильный и автомоторный институт "НАМИ"
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Application filed by Федеральное государственное унитарное предприятие "Центральный ордена Трудового Красного Знамени научно-исследовательский автомобильный и автомоторный институт "НАМИ" filed Critical Федеральное государственное унитарное предприятие "Центральный ордена Трудового Красного Знамени научно-исследовательский автомобильный и автомоторный институт "НАМИ"
Priority to RU2014120200/06A priority Critical patent/RU2554151C1/en
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Publication of RU2554151C1 publication Critical patent/RU2554151C1/en

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Abstract

FIELD: engines and pumps.
SUBSTANCE: invention proposes a fuel system containing fuel pump 28, a fuel pressure amplifier and injection nozzle 1. In housing 2 of the pressure amplifier there located is spring-loaded piston-multiplier 3, opposite which disk 11 separating drain valve 12 located after it is installed. A cavity between disk 11 and piston-multiplier 3 is interconnected with fuel accumulator 18 is interconnected with the fuel accumulator through a discharge valve and contains spring-loaded plunger made in the form of a pipe located in head of cylinders 5. Fuel pump 28 is interconnected with the fuel accumulator through a discharge valve and contains spring-loaded plunger 29 having a drive from cam shaft 26 of the engine. Plunger 29 is located in a sleeve installed in a cartridge enveloping a return spring of the plunger, which is arranged about the sleeve.
EFFECT: reduction of pressure losses of fuel supplied to the injection nozzle to increase spray pressure of fuel to engine cylinders to improve a process of mixture formation, and therefore, fuel combustion.
2 cl, 2 dwg

Description

The invention relates to diesel internal combustion engines, and in particular to their fuel equipment. It concerns the supply of fuel to the nozzle of an internal combustion engine.

There are various devices for supplying fuel to the engine nozzle, shown in applications No. 199910970, 10002273 published in Germany, in patents No. 6634336, 6895935, issued in the USA. As a closer analogue, the device for supplying fuel to the nozzle of an internal combustion engine is adopted, presented in patent No. 6854445, IPC F02M 37/04, issued in the USA. This device for supplying fuel to the nozzle of an internal combustion engine contains a fuel pressure amplifier located separately from the cylinder head of the engine. Fuel is supplied from the pressure amplifier to the nozzle through the fuel line. However, the presence of a fuel line, expanding when the pressure in it increases, leads to a decrease in the pressure of the fuel entering directly into the nozzle.

The objective is to reduce the loss of pressure of the fuel supplied to the nozzle of the diesel engine to increase the pressure of the fuel injection into the engine cylinders to improve the process of mixture formation and thereby burning fuel without complicating the design of the nozzle.

The solution to the problem of reducing the pressure loss of the fuel supplied to the diesel engine nozzle is ensured by the fact that in the diesel engine fuel system comprising a fuel pump, a fuel pressure amplifier and a nozzle, the fuel pressure amplifier comprises a tubular body installed in the cylinder head of the engine in the pressure amplifier body there is a spring-loaded piston-multiplier, in front of which a disk is installed that separates the drain valve located behind it, when opening, the floor communicates with the drain pipe nce, in which there is return spring-piston multiplier. The cavity between the disk and the multiplier piston is in communication with a fuel accumulator made in the form of a pipe located in the cylinder head parallel to the axis of the cam shaft of the engine. A fuel pump is connected to the fuel accumulator via a discharge valve, comprising a spring-loaded plunger driven by a camshaft of the engine. The plunger is located in a sleeve mounted in a cartridge surrounding the plunger return spring placed around the sleeve, a collar is made on the sleeve located between a ledge made inside the cartridge and a pressure valve housing inserted into the cartridge having a threaded connection with the cartridge on a cartridge about outside the ledge, a fastening ring is fitted having a threaded connection to the cylinder head.

With this embodiment of the fuel system, the transfer of fuel from the fuel pump through the fuel accumulator and the pressure amplifier to the nozzle does not require the use of connecting fuel lines, as a result of which fuel pressure losses are virtually eliminated. At the same time, such a fuel system is compact.

A boss is made on the body of the discharge valve from the side of the fuel accumulator, on which a sealing ring is attached, adjacent to the cylinder head.

The figure 1 presents the fuel system of a diesel internal combustion engine.

Figure 2 shows a fuel pump.

The fuel system shown in FIG. 1, intended for supplying fuel to a nozzle 1 of a diesel engine, comprises a fuel pressure amplifier having a tubular body 2 in which a spring-loaded step piston-multiplier 3 is located. The pressure amplifier body 2 is made in the form of a cup with a collar 4 (figure 2) inserted into the cylinder head 5 of the engine. A fixing ring 6, made with an internal hexagon, having a threaded connection to the cylinder head 5, a washer 7 with a conical cavity located on the side of the nozzle 1, a tubular rod 8 with conical ends located in the cavity made between the body 2 of the pressure amplifier and the nozzle 1 is installed in the washer 7, and in the funnel made in the nozzle body. A fuel line 9 is located inside the tubular rod 8 along its axis. At the end of the mounting ring 6, a sealing ring 10 is pressed between it and the pressure amplifier body 2, pressed into the cylinder head, which forms the retainer of the fixing ring 6.

Opposite the end of the piston-multiplier 3, a disk 11 is mounted in the housing of the pressure amplifier, forming a stop for the piston-multiplier. Behind the disk 11 there is a drain valve 12 with electromagnetic control, which, when opened, communicates with the drain pipe (not shown) through the tip 13 of the cavity 14, in which the return spring 15 of the multiplier piston is located. To drain fuel from the cavity 14, when the drain valve 12 is opened, a hole 16 is made in the pressure amplifier housing, and a hole 17 intersects with it 17. The cavity between the disk 11 separating the drain valve 12 and the multiplier 3 is communicated through an opening in the housing 2 pressure amplifiers with a fuel accumulator 18 located in the cylinder head of the engine.

A stepped channel 19 is made in the piston-multiplier 3 along its axis, in which a spring-loaded check valve 20 is located, which locks the fuel passage from the nozzle 1 to the fuel accumulator 18. In front of the shut-off element of the check valve 20, its seat 21 is installed, which has a threaded connection with the multiplier piston 3. In the seat 21 of the non-return valve, a through axial hole is made opposite the locking element of the non-return valve 20 and a throttle side hole 22 intersecting with the axial hole in the seat 20 and communicating with a fuel accumulator 18 through openings in the piston-multiplier 3 and in the saddle 20, the cavity 14, in which the return spring 15 of the piston-multiplier is located.

On the housing of the pressure amplifier near the shoulder 4, adjacent to the cylinder head 5, put on a sleeve 23 having a threaded connection with the cylinder head.

The nozzle 1 has a forced control by means of an electromagnetic valve 24.

The fuel accumulator 18 is made in the form of a pipe 25 located in the cylinder head 5 parallel to the axis of the cam shaft 26, which is driven by a crankshaft of the engine. A fuel pump 28 is connected to the fuel accumulator through the discharge valve 27 and comprises a spring-loaded plunger 29 driven by a cam shaft 26. The plunger 29 is located in a sleeve 30 mounted in a cartridge 31 surrounding a return spring 32 of the plunger located around the sleeve 30. On the sleeve 31 made collar 33, located between the ledge made inside the cartridge 31, and inserted into the cartridge by the housing 34 of the discharge valve 27, having a threaded connection with the cartridge 31. On the cartridge 31 near the ledge made on it from the outside, a fastening ring 35 is mounted having a threaded connection with the cylinder head 5. On the housing 34 of the discharge valve from the side of the fuel accumulator 18, a boss 36 is made, on which a sealing ring 37 is attached adjacent to the cylinder head 5. B the cylinder head 5 has a hole 38 for receiving fuel from the fuel tank through the holes in the cartridge and the sleeve into the cavity 39 inside the sleeve 31, in which the plunger 29 is located.

When the cam shaft rotates during engine operation, the plunger 29 of the fuel pump 28 periodically through the discharge valve 27 delivers fuel to the fuel accumulator 18. From the fuel accumulator, fuel enters the cavity located in front of the piston-accumulator 3 between it and the disc 11. When closed the drain valve 12 until it is activated, the fuel from the fuel accumulator 18 under high pressure created by the fuel pump 28 passes through the check valve 20 through channel 19 in the piston-multiplier 3 and the fuel ma line 9 to the nozzle 1. In addition, fuel from the axial hole in the seat 21 enters through the throttle hole 22 and the hole in the piston-multiplier 3 into the cavity 14, in which the return spring 15 of the piston-multiplier 3 is located. Under the action of the spring 15, the piston-multiplier 3, when the drain valve 12 is turned off, that is, in its closed position, it occupies the leftmost position.

When the solenoid valve 24, which controls the nozzle 6, is activated, fuel is injected into the engine cylinder under a pressure equal to the pressure in the fuel accumulator. When the activation of valve 24 is completed, fuel injection stops, the pressure in the fuel line 9 is equalized with the pressure in the fuel accumulator, and the check valve 20 closes.

If it is necessary to increase the fuel pressure with a heavy engine load, the controlled drain valve 12 is activated, that is, it is opened before the activation of the electromagnetic valve 24 controlling the nozzle 1, and then the fuel from the cavity 14 is passed through openings 16 and 17 to the fuel drain pipe through the tip 13 drain valve 12. As a result, the pressure in the cavity 14 decreases, and the piston-multiplier 3 under the pressure on it from the side of the disk 11, overcoming the compression force of the spring 15, compresses the fuel to the top flow line 9 to a higher pressure, which is transmitted to the nozzle 1. In this case, under the influence of this high pressure, the check valve 20 remains closed. When a signal is applied to the solenoid valve 24, a nozzle 1 injects a portion of fuel under high pressure in excess of the pressure in the fuel accumulator into the engine cylinder. When the solenoid valve 24 is turned off, fuel injection into the engine cylinder by the nozzle 1 stops. Then, the activation of the drain valve 12. The valve 12 closes, the pressure in the cavity 14 increases, and the piston-multiplier 3 under the action of the spring 15 moves towards the disk 11, returning to its original position. During the movement of the piston-multiplier 3 towards the disk 11, fuel from the fuel accumulator enters through the holes in the seat 21 of the check valve 20 and in the piston-multiplier 3 into the cavity 14 in which the spring 15 is located, filling this cavity.

With such a fuel supply device, built into the cylinder head of the engine, the fuel is supplied to the nozzle under increased pressure without pressure loss, while the design of the nozzle is not complicated. Reducing the pressure loss of the fuel supplied to the nozzle increases the pressure of the fuel injection into the engine cylinders, which improves the process of mixture formation and thereby fuel combustion.

Claims (2)

1. A diesel engine fuel system comprising a fuel pump, a fuel pressure booster and a nozzle, characterized in that the fuel pressure booster comprises a tubular body mounted in the cylinder head of the engine, a spring-loaded piston-multiplier is located in the body of the pressure booster, against which a disc separating the drain valve located behind it, when opening, communicates with the drain pipe the cavity in which the piston-multiplier return spring is located, the cavity between the disk a multiplier piston is in communication with a fuel accumulator made in the form of a pipe located in the cylinder head parallel to the axis of the cam shaft of the engine, a fuel pump is connected to the fuel accumulator through a discharge valve, a fuel pump containing a spring-loaded plunger driven by a cam shaft of the engine, the plunger is located in a sleeve installed in the cartridge surrounding the plunger return spring placed around the sleeve, a collar is made on the sleeve located between the ledge made inside the cartridge and inserted a cartridge housing the discharge valve, having a cartridge with a threaded connection on a bobbin formed thereon about the outside ledge wearing retaining ring having a threaded connection with the cylinder head.
2. The fuel system according to claim 1, characterized in that a boss is made on the body of the discharge valve from the side of the fuel accumulator, on which a sealing ring is attached adjacent to the cylinder head.
RU2014120200/06A 2014-05-20 2014-05-20 Diesel engine fuel system RU2554151C1 (en)

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RU2014120200/06A RU2554151C1 (en) 2014-05-20 2014-05-20 Diesel engine fuel system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2715945C2 (en) * 2015-01-21 2020-03-04 Форд Глобал Текнолоджиз, Ллк Pump system (embodiments) and method of direct fuel injection

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1377440A1 (en) * 1986-09-19 1988-02-28 Институт Механики Машин Ан Гсср System for feeding and injecting fuel into diesel engine combustion chamber
RU2078244C1 (en) * 1995-03-24 1997-04-27 Военный автомобильный институт System to feed and inject fuel into combustion chamber of diesel engine
US20050166898A1 (en) * 2002-09-16 2005-08-04 Christian Braeuer Fuel injection system and cylinder head with a central fuel reservoir
US7320310B2 (en) * 2003-04-02 2008-01-22 Robert Bosch Gmbh Fuel injector provided with provided with a pressure transmitter controlled by a servo valve
RU2359147C2 (en) * 2007-03-02 2009-06-20 ООО Управляющая компания "Алтайский завод прецизионных изделий" Method of fuel feed
US7970526B2 (en) * 2009-01-05 2011-06-28 Caterpillar Inc. Intensifier quill for fuel injector and fuel system using same
US8245694B2 (en) * 2007-05-07 2012-08-21 Robert Bosch Gmbh Fuel injection system with pressure boosting

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1377440A1 (en) * 1986-09-19 1988-02-28 Институт Механики Машин Ан Гсср System for feeding and injecting fuel into diesel engine combustion chamber
RU2078244C1 (en) * 1995-03-24 1997-04-27 Военный автомобильный институт System to feed and inject fuel into combustion chamber of diesel engine
US20050166898A1 (en) * 2002-09-16 2005-08-04 Christian Braeuer Fuel injection system and cylinder head with a central fuel reservoir
US7320310B2 (en) * 2003-04-02 2008-01-22 Robert Bosch Gmbh Fuel injector provided with provided with a pressure transmitter controlled by a servo valve
RU2359147C2 (en) * 2007-03-02 2009-06-20 ООО Управляющая компания "Алтайский завод прецизионных изделий" Method of fuel feed
US8245694B2 (en) * 2007-05-07 2012-08-21 Robert Bosch Gmbh Fuel injection system with pressure boosting
US7970526B2 (en) * 2009-01-05 2011-06-28 Caterpillar Inc. Intensifier quill for fuel injector and fuel system using same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2715945C2 (en) * 2015-01-21 2020-03-04 Форд Глобал Текнолоджиз, Ллк Pump system (embodiments) and method of direct fuel injection

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