SU686637A3

SU686637A3 - Fuel pump

Info

Publication number: SU686637A3
Application number: SU701426242A
Authority: SU
Inventors: Эккерт Конрад; Хефер Геральд
Original assignee: Роберт Бош Гмбх (Фирма)
Priority date: 1969-04-09
Filing date: 1970-04-08
Publication date: 1979-09-15
Also published as: ES378335A1; RO56290A

Description

(54) ТОПЛИВНЫЙ НАСОС(54) FUEL PUMP

1one

Изобретение относитс к области машиностроени , в частности к топливной аппаратуре двигателей внутреннего сгорани с внутренним смесеобразованием .The invention relates to the field of mechanical engineering, in particular, to the fuel equipment of internal combustion engines with internal mixing.

Известны топливные насосы, содержащие корпус, в котором размещен с возможностью возвратно-поступательного и вращательного перемещений двухступенчатый плунжерраспределитель , полость под первой ступенью которого сообщена каналами с нагнетательной магистралью и дозатором, гидравлически св занным со второй ступенью и выполненным в виде подпружиненного золотника с двум уплотн ющими по сами, снабжеными регулирукнцими кромками, дл перекрыти входов в отсечную полость 1. Однако такое выполнение топливных насосов не обеспечивает высокой точности дозировани топли в св зи с тем,что золотник имеет одну степень свободы и пр моугольную регулирующую кромку, а это не позвол ет корректировать при изменении режимов работы двигател угол опережени подачи топлива и его дозы.Fuel pumps are known, comprising a housing in which a two-stage plunger distributor is disposed with reciprocating and rotational movements, the cavity under the first stage of which is connected by channels to the discharge line and dispenser hydraulically connected to the second stage and designed as a spring-loaded valve with two sealing by themselves, equipped with adjustable edges, to block the entrances to the cut-off cavity 1. However, this design of the fuel pumps does not provide high The accuracy of fuel metering is due to the fact that the spool has one degree of freedom and a rectangular regulating edge, and this does not allow to correct the angle of advance of the fuel supply and dose as the operating modes of the engine change.

Целью изобретени вл етс повышение точности дозировани топлива при изменении режимов работы двигател путем корректировки угла опережени подачи топлива. Это достигаетс тем, что в предлагаемом насосе золотник выполнен поворотным, а по меньшей мере одна его регулирующа кромка - наклонной.The aim of the invention is to improve the accuracy of fuel metering when changing engine operating modes by adjusting the fuel advance angle. This is achieved by the fact that in the proposed pump the spool is turning, and at least one of its regulating edge is inclined.

Объем под второй ступенью может быть сообщен с отсечной полостью при помощи выполненных в плунжере каналов, на выходе из которых установлена подвижно муфта опережени The volume under the second stage can be communicated with the shut-off cavity by means of channels made in the plunger, at the output of which the advance coupling is mounted

подачи, топлива.filing, fuel.

На фиг.1 и 2 показан описываемый топливный насос.Figure 1 and 2 shows the described fuel pump.

Топливный насос содерж-ит корпус 1, в котором размещен с возможностьюThe fuel pump contains a housing 1, which is placed with the possibility

возвратно-поступательного и вращательного перемещений двухступенчатый плунжер-распределитель 2 со ступен ми 3 и 4, полость 5 под первой ступенью 3 которого сообщена каналом 6 с нагнетательной магистралью 7 и дозатором 8, гидравлически св занным со второй ступенью 4 посредством канала 9 и выполненным в виде подпружиненного посредством пружиныthe reciprocating and rotational movements of the two-stage plunger-distributor 2 with steps 3 and 4, the cavity 5 under the first stage 3 of which is connected by channel 6 to the discharge line 7 and dispenser 8 hydraulically connected to the second stage 4 through channel 9 and made in the form spring loaded by spring

Claims

10 li spools with two sealing along 12 and 13 themselves, provided with adjusting edges 14 and 15 for closing channels 16 and 17 communicated with a cut-off cavity 18. The spool 1 is made turning, and at least one its adjusting edge 14 or 15 - inclined. In Fig. 1, both edges 14 and 15 are inclined. The volume 19 under the second stage 4 communicates with the cut-off cavity 18 by means of 2 channels 20 made in the plunger, output 21 of which is movably mounted to the clutch 22 of fuel advance. The shaft 23 mounted in the casing 1 and connected to the spool by means of a collar 24 is provided for turning the slide valve c. The drive shaft 23 is driven from the speed controller 25. The controller 25 may be electrically, hydraulically, pneumatically, as well as mechanical. In the discharge line 7, a check valve 26 is placed. The cavity 5 communicates with the cut-off cavity 18 through the channels 27, performed in stage 3 of the plunger 2, and the channel 28, made in the housing 1. When the pump is operating, the fuel from the cut-off cavity 18 through the channels 28 and 27 enters the cavity 5 under the first stage. 3 of the plunger-distributor 2 and then is forced out of it under pressure to the dispenser 8 from the side of the regulating edges 14 and 15 of the spool 11 and into the discharge line 7 through the channel 6 and the check valve 26, ensuring the supply of fuel from cavity.5 in the inlet The main line 7 at a pressure exceeding the pressure of locking the valve 26. At the same time, the fuel flows through the channels 20 from cutoff 18 to a volume 19 under the second stage 4 and is displaced through channel 9 to the dispenser 8. When the fuel pressure is on the sealing side 12 The gland 11 exceeds the force of the springs 10 from the sealing side of the ca 1 and the spool moves, compressing the spring 10, until the pressure from the sealing web 13 is balanced by the elastic force of the spring. When the spool 11 er is moved, the adjusting edges 14 and 15 drosslate the channels 16 and 17, reducing or stopping the overflow of fuel from the cavity 5 into the shut-off cavity 18 Depending on the mode of operation 74 of the wiggle (not shown) by means of the regulator 25, the angular the position of the spool 11, and hence the position of the adjusting edges 14 and 15 relative to the channels 16 and 17. As a result, the phases and doses of the overflow of fuel from the cavity 5 into the cut-off cavity 18 change. The angle of advance of the fuel supply is controlled by m fty 22 advance the fuel supply depending on the mode of operation of the engine. Thus, the implementation of the spool turning and at least one of its regulating edges inclined, as well as the volume under the second stage communicated with the shut-off cavity through the channels, at the exit of which the moving fuel advance coupling is installed, can improve the accuracy of fuel metering engine operation, resulting in a better flow of the workflow when the engine operating conditions change. Claim 1. Fuel pump, comprising a casing in which a two-stage plunger-distributor is placed with the possibility of reciprocating and rotational movements. spool with two gaskets by themselves, equipped with regulating edges for blocking the entrances to the cut-off cavity, characterized in that, in order to increase the accuracy to ation fuel spool is rotatable, and at least one adjusting its edge - inclined.

2. A pump according to claim 1, characterized in that the volume under the second stage is in communication with the shut-off cavity when the channels are made in the plunger, at the exit of which the fluid advance coupling is installed. Information sources. taken into account during the examination 1. German patent 1247067, cl. 46 from 115/02, published. 1968.

P