KR102265797B1 - Fuel Supplying Device for Diesel Engine - Google Patents

Abstract

[Project] To provide a fuel supply device for a diesel engine that can prevent reverse engine starting.
[Solution] As the fuel injection cam (2), a reverse-start prevention cam (20) is used, and the reverse-rotation start-prevention cam (20) has a fuel intake cam surface (2b), and the engine forward rotation (3) is formed to a position in contact with the tappet 4a of the plunger 4 at the end 10c of the intake stroke 10 of is pushed to the top dead center side, the fuel 8 is injected from the plunger chamber 5 through the injector 6 into the combustion chamber 7, and the fuel 8 is injected at the time of reverse engine rotation 11 The fuel injection period 12 is started 12a during the exhaust stroke 13 at the time of engine reverse rotation 11, and during this exhaust stroke 13, part or all of the injected fuel 8 is removed from the combustion chamber 7 ) through the intake valve port 14 is configured to be discharged.

Description

Fuel Supplying Device for Diesel Engine

The present invention relates to a fuel injection device for a diesel engine, and more particularly, to a fuel supply device for a diesel engine capable of preventing reverse rotation of the engine.

Conventionally, as a fuel injection device for a diesel engine, there are the following.

As shown in Fig. 5(A), the fuel injection pump 1 and the fuel injection cam 2 are provided, and the fuel injection cam 2 has a fuel injection cam surface 2a and a fuel intake cam surface 2b. formed, and at the time of engine forward rotation (3), the plunger (4) of the fuel injection pump (1) is pushed toward top dead center by the cam surface (2a) for fuel injection, and the injector (6) is removed from the plunger chamber (5). Diesel configured so that fuel 8 is injected into the combustion chamber 7 through the plunger 4 and returned to the bottom dead center side by the guide of the fuel intake cam surface 2b, and the fuel 8 is sucked into the plunger chamber 5 An engine fuel injection device (see, for example, Patent Document 1).

According to this type of device, there is an advantage that the fuel 8 can be supplied to the combustion chamber 7 with a simple configuration by the fuel injection pump 1 and the fuel injection cam 2 .

[Patent Document 1] Japanese Patent Application Laid-Open No. 2006-17047 (refer to FIG. 2)

<Problem> The engine sometimes starts in reverse rotation.

In this type of device, when the engine is stopped while climbing a hill with an engine-mounted machine and the machine runs backwards in the downhill direction, the engine may be started in a reverse rotation state.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuel supply device for a diesel engine capable of preventing reverse rotation of the engine.

As a result of research, the inventors of the present invention have found that the conventional fuel intake cam surface 2b shown in Fig. 5(A) is a plunger in the middle stage 10b of the intake stroke 10 at the time of engine forward rotation 3 . Since it is formed only up to the position where it abuts against the tappet 4a of (4), at the time of engine reverse rotation 11, the plunger 4 is pushed toward top dead center by the cam surface 2b for fuel intake, and plunger chamber. While the fuel 8 is injected into the combustion chamber 7 through the injector 6 from (5), as shown in FIG. 5(B), at the time of the engine reverse rotation 11 in which this fuel 8 is injected. The fuel injection period 12 is started 12a during the intake stroke 18 at the time of engine reverse rotation 11, and all of the injected fuel 8 is burned in the later explosion stroke 19, resulting in a large output It has been found that this occurs, and the disadvantage of starting the engine in a reverse rotation state occurs.

As a result of repeated research, the inventors of the present invention have also made the engine by improving the cam profile so that part or all of the injected fuel 8 is discharged from the combustion chamber 7 when the engine is reversely rotated 11 . It has been found that the disadvantage of starting in the reverse rotation state can be prevented, leading to the present invention.

(Invention specific matters common to the inventions according to claims 1, 3, 4 and 6)

The invention-specific matters common to the inventions according to claims 1, 3, 4 and 6 are as follows.

As illustrated in FIG. 1(A) or FIG. 4(A), the fuel injection pump 1 and the fuel injection cam 2 are provided, and the fuel injection cam 2 has a fuel injection cam surface 2a and fuel. The suction cam surface 2b is formed, and at the time of the engine forward rotation 3, the plunger 4 of the fuel injection pump 1 is pushed toward the top dead center side by the fuel injection cam surface 2a, and the plunger chamber 5 ) through the injector 6, the fuel 8 is injected into the combustion chamber 7, and the plunger 4 returns to the bottom dead center side by the guide of the fuel intake cam surface 2b, and the fuel ( 8) In the diesel engine fuel injection device configured to be sucked in, it is configured as follows.

(Invention specific matters common to the inventions according to claims 1 and 4)

The invention-specific matters common to the inventions according to claims 1 and 4 are as follows.

As illustrated in Fig. 1(A), a reverse rotation start prevention cam 20 is used for the fuel injection cam 2, and the reverse rotation start prevention cam 20 has a fuel intake cam surface 2b, It is formed up to a position in contact with the tappet 4a of the plunger 4 at the end 10c of the intake stroke 10 at the time of the engine forward rotation 3,

At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and, as illustrated in FIG. 1(B) , the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is exhausted at the time of engine reverse rotation 11 . It starts 12a during the stroke 13, and it is comprised so that part or all of the injected fuel 8 may be discharged|emitted from the combustion chamber 7 through the intake valve port 14 during this exhaust stroke 13. As shown in FIG.

(Invention specific matters common to the inventions according to claims 3 and 6)

The invention-specific matters common to the inventions according to claims 3 and 6 are as follows.
As illustrated in Fig. 4(A), the reverse-starting prevention cam 20 is used for the fuel injection cam 2, and this reverse-rotation starting prevention cam 20 has a fuel intake cam surface 2b, Formation is started (2c) from the position in contact with the tappet (4a) of the plunger (4) after the timing (10a) of the intake stroke (10) at the time of the engine forward rotation (3) (2c);

At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and, as illustrated in Fig. 4(B) , the fuel injection period 12 at the time of the engine reverse rotation 11 in which this fuel 8 is injected is the exhaust at the time of the reverse engine rotation 11 . It is configured so that a part or all of the injected fuel 8 is discharged from the combustion chamber 7 through the intake valve port 14 during the stroke 13, completed 12b, during the exhaust stroke 13.
(Invention specific matters common to the inventions according to claims 1 and 3)
The invention-specific matters common to the inventions according to claims 1 and 3 are as follows.
As illustrated in FIG. 2 , a plurality of fuel injection cams 2 are formed to correspond to a plurality of cylinders #1, #2, #3, and #4, and fuel 8 is supplied to the plurality of cylinders. As a plurality of fuel injection cams 2 to be injected, a reverse start prevention cam 20 is used, and the reverse rotation start prevention cam 20 is a plurality of cylinders into which fuel 8 is injected, the cylinders at both ends of the engine ( #1) (#4) is a fuel injection device for a diesel engine, characterized in that it is included.
(Invention specific matters common to the inventions according to claims 4 and 6)
The invention-specific matters common to the inventions according to claims 4 and 6 are as follows.
As illustrated in FIG. 2 , a plurality of fuel injection cams 2 are formed corresponding to a plurality of cylinders #1 (#2) (#3) and #4, and a plurality of cylinders #1 (#) are formed. 2) All fuel injection cams (2) that inject fuel (8) into half of the cylinders (#1) and (#4) that explode every other one in (#3) and (#4) in the order of explosion. ) (2), a fuel injection device for a diesel engine, characterized in that the cam 20 for preventing reverse rotation is used.

(Invention according to claims 1, 3, 4 and 6)

The invention according to claims 1, 3, 4 and 6 has the following effects.

<<Effect>> It is possible to prevent the engine from starting in reverse.

As illustrated in FIGS. 1(B) and 4(B) , at the time of the engine reverse rotation 11 , part or all of the injected fuel 8 is sucked in from the combustion chamber 7 during the exhaust stroke 13 . Since it is comprised so that it may be discharged|emitted through the valve opening 14, sufficient output cannot be obtained by fuel shortage in the subsequent explosion stroke 19, but reverse rotation start of an engine can be prevented.

(Invention according to claims 2 and 5)

The invention according to claims 2 and 5 exhibits the following effects in addition to the effects of the invention according to claims 1 and 4.

<Effect> Clogging of carbon in the injector is prevented.

As illustrated in FIG. 1(B) , the fuel intake cam surface 2b extends from the explosion stroke 21 at the time of the engine forward rotation 3 to the end 10c of the intake stroke 10, the plunger 4 Since the plunger chamber 5 is configured to have a positive pressure when fuel is sucked into the plunger chamber 5 by forming up to a position in contact with the tappet 4a of the This is suppressed, and clogging of carbon in the injector 6 resulting therefrom is prevented.

When fuel is sucked into the plunger chamber 5, the positive pressure of the plunger chamber 5 is that the fuel intake cam surface 2b is formed over a long range, so the inclination thereof is made gentle and the plunger 4 ) to lower the speed toward the bottom dead center.
(Invention according to claims 1 and 3)
The invention according to claims 1 and 3 has the following effects.
<<Effect>> It is possible to prevent the engine from starting in reverse rotation.
As illustrated in FIG. 2 , a plurality of fuel injection cams 2 are formed to correspond to a plurality of cylinders #1, #2, #3, and #4, and fuel 8 is supplied to the plurality of cylinders. As a plurality of fuel injection cams 2 to be injected, a reverse start prevention cam 20 is used, and the reverse rotation start prevention cam 20 is a plurality of cylinders into which fuel 8 is injected, the cylinders at both ends of the engine ( Since #1) (#4) is included, when the engine reverses rotation 11, the cylinders #1 and #4 at both ends lack output, and the reverse rotation start of the engine can be prevented.

(Invention according to claims 4 and 6)

The invention according to claims 4 and 6 has the following effects.

<<Effect>> It is possible to prevent the engine from starting in reverse.

As illustrated in FIG. 2 , a plurality of fuel injection cams 2 are formed corresponding to a plurality of cylinders #1 (#2) (#3) and #4, and a plurality of cylinders #1 (#) are formed. 2) All fuel injection cams (2) that inject fuel (8) into half of the cylinders (#1) and (#4) that explode every other one in (#3) and (#4) in the order of explosion. ) (2), since the cam 20 for preventing reverse rotation is used, at the time of engine reverse rotation 11, the missing cylinder #1 (#4) lacks output, which prevents reverse rotation start of the engine. can be prevented

[FIG. 1] It is a figure explaining the fuel injection apparatus of the engine which concerns on 1st Embodiment of this invention, FIG. 1(A) is a schematic diagram, FIG. 1(B) is a time chart.
[FIG. 2] It is explanatory drawing of the injection pump and fuel injection cam used in the apparatus of FIG.
[ Fig. 3 ] It is a schematic diagram of the apparatus of Fig. 1 .
Fig. 4 is a view for explaining a fuel injection device for an engine according to a second embodiment of the present invention. Fig. 4 (A) is a schematic diagram, and Fig. 4 (B) is a time chart.
[FIG. 5] A diagram for explaining a fuel injection device of an engine according to the prior art, FIG. 5 (A) is a schematic diagram, and FIG. 5 (B) is a time chart.

1 to 3 are views for explaining a fuel injection device for an engine according to a first embodiment of the present invention, and FIG. 4 is a diagram for explaining a fuel injection device for an engine according to a second embodiment of the present invention. In the form, a fuel injection device of a vertical four-cylinder diesel engine will be described.

The outline of this engine is as follows.

As shown in FIG. 3 , this engine is a vertical four-cylinder diesel engine, in which a cylinder head 23 is assembled on an upper portion of a cylinder block 22 , and a piston 25 is moved inwardly in a cylinder bore 24 so as to be able to move up and down. Fitted, the injector 6 is mounted on the cylinder head 23 , and the intake valve 27 is disposed on the intake valve port 14 of the intake port 26 of the cylinder head 23 . As shown in Fig. 1B, the cylinder head 23 is also provided with an exhaust port (not shown) and an exhaust valve 28 (see Fig. 1A). As shown in FIG. 3 , a cavity 29 concave downward is formed at the top of the piston 25 , and the inside of the cavity 29 serves as a combustion chamber 7 . Fuel 8 is pressurized from the fuel injection pump 1 to the injector 6 . The fuel injection pump 1 is accommodated in a pump accommodating chamber 30 formed in the cylinder block 22 , and a fuel injection camshaft 31 is installed below the fuel injection pump 1 . The fuel injection pump 1 is a Bosch type thermal fuel injection pump, and has four plungers 4 corresponding to four cylinders and the plunger chamber 5 thereof.

As shown in Fig. 1A, this engine includes a fuel injection pump 1 and a fuel injection cam 2, and the fuel injection cam 2 has a fuel injection cam surface 2a and a fuel intake cam surface. (2b) is formed, and at the time of engine forward rotation (3), the plunger 4 of the fuel injection pump 1 is pushed toward the top dead center side by the cam surface 2a for fuel injection, and the injector chamber 5 comes out of the plunger chamber 5. The fuel 8 is injected into the combustion chamber 7 through (6), and the plunger 4 returns to the bottom dead center side by the guide of the fuel intake cam surface 2b, and the fuel 8 is inserted into the plunger chamber 5. It is designed to be inhaled. The return of the plunger 4 to the bottom dead center is performed by the return spring 4b.

As shown in Fig. 1(A), a reverse rotation start prevention cam 20 is used as the fuel injection cam 2, and this reverse rotation start prevention cam 20 has a fuel intake cam surface 2b, At the end 10c of the intake stroke 10 at the time of the forward rotation 3, it is formed up to a position in contact with the tappet 4a of the plunger 4 .

At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and, as shown in FIG. 1(B) , the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is the exhaust stroke at the time of engine reverse rotation 11 . It is configured such that a part or all of the injected fuel 8 is discharged from the combustion chamber 7 through the intake valve port 14 during the exhaust stroke 13, starting 12a in (13).

In the drawing, reference numeral 10a denotes the timing of the intake stroke 10 during engine forward rotation 3, 10b denotes its intermediate stage, 25a denotes a piston lift cycle curve, and 27a denotes an intake cam cam lift curve. , (28a) denotes a cam lift curve of the exhaust cam, and (32) denotes a fuel injection period during normal engine rotation (3).

3, the fuel injection pump 1 has a fuel storage chamber 15 and a fuel inlet 16, and the fuel storage chamber 15 is formed around the plunger chamber 5, and the fuel storage chamber ( 15 ), the fuel 8 is pumped from the fuel supply pump 17 , and the fuel inlet 16 is formed in the peripheral wall 5a of the plunger chamber 5 , and is inserted into the fuel storage chamber 15 . is approaching

As shown in Fig. 1(B), the fuel intake cam surface 2b extends from the explosion stroke 21 at the time of the engine forward rotation 3 to the end 10c of the intake stroke 10 of the plunger 4 By being formed at the position in contact with the tappet 4a, it is comprised so that the plunger chamber 5 may become a positive pressure at the time of fuel suction into the plunger chamber 5. As shown in FIG.

The fuel 8 in the fuel tank 33 is supplied to the fuel storage chamber 15 , and the fuel 8 not used for fuel injection returns from the fuel storage chamber 15 to the fuel tank 33 .

As shown in Fig. 2, four fuel injection cams 2 are formed corresponding to the four cylinders #1, #2, #3, and #4, and the four cylinders #1 (#) are formed. 2) Among (#3) and #4, all fuel injection cams (2) (2) that inject fuel (8) into half of the cylinders (#1) (#4) that explode every other one according to the set explosion sequence ), the cam 20 for preventing reverse rotation is used. Specifically, as all the fuel injection cams 2 and 2 for injecting fuel into the first cylinder #1 and the fourth cylinder #4, the reverse start prevention cam 20 is used. As the fuel injection cams 2 and 2 for injecting fuel into the second cylinder #2 and the third cylinder #3, the conventional fuel injection cams 2 and 2 shown in Fig. 5A are this is being used
As shown in Fig. 2, a plurality of fuel injection cams 2 are formed corresponding to the plurality of cylinders #1, #2, #3, and #4, and the fuel 8 is injected into the plurality of cylinders. As a plurality of fuel injection cams 2, a reverse rotation start prevention cam 20 is used, and the reverse rotation start prevention cam 20 is a plurality of cylinders into which fuel 8 is injected, and the cylinders at both ends of the engine (# 1)(#4) is included.

Next, a second embodiment of the present invention will be described.

This second embodiment differs from the first embodiment in the following points.

As shown in Fig. 4(A) , a reverse rotation starting prevention cam 20 is used as the fuel injection cam 2, and the reverse rotation starting prevention cam 20 has a fuel intake cam surface 2b, It is configured such that the formation 2c is started from the position in which the tappet 4a of the plunger 4 abuts after the timing 10a of the intake stroke 10 at the time of the forward rotation 3 .

At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and, as shown in FIG. 4(B) , the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is the exhaust stroke at the time of engine reverse rotation 11 . It is completed in (13) (12b), and it is comprised so that part or all of the injected fuel 8 may be discharged|emitted from the combustion chamber 7 via the intake valve port 14 during this exhaust stroke 13. As shown in FIG.

The other structure becomes the same structure as 1st Embodiment, and the same code|symbol and a name are described for the element same as 1st Embodiment in FIG.4(A)(B).

(1) Fuel injection pump
(2) Fuel injection cam
(2a) Cam face for fuel injection
(2b) Cam surface for fuel intake
(2c) formation begins
(3) engine forward rotation
(4) plunger
(4a) tappet
(5) plunger seal
(6) injectors
(7) combustion chamber
(8) fuel
(10) Intake stroke at forward rotation
(10a) Timing
(10c) boil
(11) engine reverse rotation
(12) Fuel injection period
(13) Exhaust stroke in reverse rotation
(14) Intake valve port
(15) fuel storage room
(16) fuel intake
(17) Fuel supply pump
(18) Intake stroke in reverse rotation

Claims (6)

A fuel injection pump (1) and a fuel injection cam (2) are provided, and a fuel injection cam surface (2a) and a fuel intake cam surface (2b) are formed on the fuel injection cam (2), and the engine forward rotation (3) In this case, the plunger 4 of the fuel injection pump 1 is pushed to the top dead center side by the cam surface 2a for fuel injection, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 . In the fuel injection device of a diesel engine configured so that the fuel (8) is injected into the plunger chamber (5) by the plunger (4) returning to the bottom dead center side by the guide of the fuel intake cam surface (2b),
A reverse start prevention cam 20 is used as the fuel injection cam 2, and the reverse rotation start prevention cam 20 has a fuel intake cam surface 2b, an intake stroke (3) during engine forward rotation (3). 10) is formed to a position in contact with the tappet (4a) of the plunger (4) in the boil (終期) (10c),
At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is started 12a during the exhaust stroke 13 during engine reverse rotation 11, During this exhaust stroke (13), part or all of the injected fuel (8) is configured to be discharged from the combustion chamber (7) through the intake valve port (14),
A plurality of fuel injection cams 2 are formed to correspond to the plurality of cylinders #1, #2, #3, and #4, and a plurality of fuel injection cams for injecting fuel 8 into the plurality of cylinders ( As 2), a reverse-start prevention cam 20 is used, and as a plurality of cylinders into which fuel 8 is injected with the reverse rotation-start prevention cam 20, cylinders #1 and #4 at both ends of the engine are Diesel engine fuel injection device, characterized in that it is included. The method according to claim 1,
The fuel injection pump (1) has a fuel storage chamber (15) and a fuel intake port (16), the fuel storage chamber (15) is formed around the plunger chamber (5), and in the fuel storage chamber (15), a fuel supply pump Fuel (8) is fed under pressure from (17), and the fuel inlet (16) is formed in the peripheral wall (5a) of the plunger chamber (5) and approaches the fuel storage chamber (15),
The fuel intake cam surface 2b is formed at a position in contact with the tappet 4a of the plunger 4 from the explosion stroke 21 at the time of the engine forward rotation 3 to the end 10c of the intake stroke 10. , A fuel injection device for a diesel engine, characterized in that when fuel is sucked into the plunger chamber (5), the plunger chamber (5) is a positive pressure. A fuel injection pump (1) and a fuel injection cam (2) are provided, and a fuel injection cam surface (2a) and a fuel intake cam surface (2b) are formed on the fuel injection cam (2), and the engine forward rotation (3) In this case, the plunger 4 of the fuel injection pump 1 is pushed to the top dead center side by the cam surface 2a for fuel injection, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 . In the fuel injection device of a diesel engine configured so that the fuel (8) is injected into the plunger chamber (5) by the plunger (4) returning to the bottom dead center side by the guide of the fuel intake cam surface (2b),
A reverse start prevention cam 20 is used as the fuel injection cam 2, and the reverse rotation start prevention cam 20 has a fuel intake cam surface 2b, an intake stroke (3) during engine forward rotation (3). Formation is started (2c) from the position in contact with the tappet (4a) of the plunger (4) after the timing (始期) (10a) of 10),
At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is completed (12b) during the exhaust stroke 13 during engine reverse rotation 11, During this exhaust stroke (13), part or all of the injected fuel (8) is configured to be discharged from the combustion chamber (7) through the intake valve port (14),
A plurality of fuel injection cams 2 are formed to correspond to the plurality of cylinders #1, #2, #3, and #4, and a plurality of fuel injection cams for injecting fuel 8 into the plurality of cylinders ( As 2), a reverse-start prevention cam 20 is used, and as a plurality of cylinders into which fuel 8 is injected with the reverse rotation-start prevention cam 20, cylinders #1 and #4 at both ends of the engine are Diesel engine fuel injection device, characterized in that it is included. A fuel injection pump (1) and a fuel injection cam (2) are provided, and a fuel injection cam surface (2a) and a fuel intake cam surface (2b) are formed on the fuel injection cam (2), and the engine forward rotation (3) In this case, the plunger 4 of the fuel injection pump 1 is pushed to the top dead center side by the cam surface 2a for fuel injection, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 . In the fuel injection device of a diesel engine configured so that the fuel (8) is injected into the plunger chamber (5) by the plunger (4) returning to the bottom dead center side by the guide of the fuel intake cam surface (2b),
A reverse start prevention cam 20 is used as the fuel injection cam 2, and the reverse rotation start prevention cam 20 has a fuel intake cam surface 2b, an intake stroke (3) during engine forward rotation (3). 10) is formed to a position in contact with the tappet (4a) of the plunger (4) in the boil (終期) (10c),
At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is started 12a during the exhaust stroke 13 during engine reverse rotation 11, During this exhaust stroke (13), part or all of the injected fuel (8) is configured to be discharged from the combustion chamber (7) through the intake valve port (14),
A plurality of fuel injection cams 2 are formed corresponding to the plurality of cylinders #1 (#1) (#2) (#3) (#4), and the plurality of cylinders (#1) (#2) (#3) (# In 4), in accordance with the predetermined explosion sequence, reverse rotation with all fuel injection cams (2) and (2) that inject fuel (8) into half of the cylinders (#1) (#4) that explode every other time. A fuel injection device for a diesel engine, characterized in that a cam (20) for preventing starting is used. 5. The method according to claim 4,
The fuel injection pump (1) has a fuel storage chamber (15) and a fuel intake port (16), the fuel storage chamber (15) is formed around the plunger chamber (5), and in the fuel storage chamber (15), a fuel supply pump Fuel (8) is fed under pressure from (17), and the fuel inlet (16) is formed in the peripheral wall (5a) of the plunger chamber (5) and approaches the fuel storage chamber (15),
The fuel intake cam surface 2b is formed at a position in contact with the tappet 4a of the plunger 4 from the explosion stroke 21 at the time of the engine forward rotation 3 to the end 10c of the intake stroke 10. , A fuel injection device for a diesel engine, characterized in that when fuel is sucked into the plunger chamber (5), the plunger chamber (5) is a positive pressure. A fuel injection pump (1) and a fuel injection cam (2) are provided, and a fuel injection cam surface (2a) and a fuel intake cam surface (2b) are formed on the fuel injection cam (2), and the engine forward rotation (3) In this case, the plunger 4 of the fuel injection pump 1 is pushed to the top dead center side by the cam surface 2a for fuel injection, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 . In the fuel injection device of a diesel engine configured so that the fuel (8) is injected into the plunger chamber (5) by the plunger (4) returning to the bottom dead center side by the guide of the fuel intake cam surface (2b),
A reverse start prevention cam 20 is used as the fuel injection cam 2, and the reverse rotation start prevention cam 20 has a fuel intake cam surface 2b, an intake stroke (3) during engine forward rotation (3). Formation is started (2c) from the position in contact with the tappet (4a) of the plunger (4) after the timing (始期) (10a) of 10),
At the time of engine reverse rotation 11, the plunger 4 is pushed to the top dead center side by the cam surface 2b for fuel intake, and the fuel 8 is fed from the plunger chamber 5 through the injector 6 into the combustion chamber 7 ) is injected and the fuel injection period 12 at the time of reverse engine rotation 11 during which this fuel 8 is injected is completed (12b) during the exhaust stroke 13 during engine reverse rotation 11, During this exhaust stroke (13), part or all of the injected fuel (8) is configured to be discharged from the combustion chamber (7) through the intake valve port (14),
A plurality of fuel injection cams 2 are formed corresponding to the plurality of cylinders #1 (#1) (#2) (#3) (#4), and the plurality of cylinders (#1) (#2) (#3) (# In 4), in accordance with the predetermined explosion sequence, reverse rotation with all fuel injection cams (2) and (2) that inject fuel (8) into half of the cylinders (#1) (#4) that explode every other time. A fuel injection device for a diesel engine, characterized in that a cam (20) for preventing starting is used.

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