JPS6124691Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel injection valve portion of a unit injector that integrally constitutes a fuel injection pump and a fuel injection valve in a diesel engine.

A fuel injection pump is a device that pumps fuel oil by moving a plunger back and forth within a barrel by the movement of a cam on a camshaft. Generally, a delivery valve or a check valve is provided at the discharge port, but the suction hole 5a of the valve 5 is not provided with a check valve, and the tip of the plunger 3 is connected to the valve. Move the cylinder hole of 5,
A blocking effect is achieved by blocking the diameter of the suction hole 5a. However, at this time, the closer the blockage is to complete, the more high-pressure fuel oil is injected as return oil from the suction port 5a. This is called a spill, and this spill is sprayed onto the inner surface of the oil reservoir 6a of the injector body 6 in the part where the suction hole 5a is opened.
This causes an invasive action on the part and creates an invasive hole over a long period of time.

The oil reservoir 6a provided on the inner circumference of the injector turbo day 6 is slightly inclined.
It has a cross-sectional shape of . The spill deflector 10 is closely fitted to the back surface of the portion of the oil sump circumferential groove facing the suction hole 5a.

As shown in FIGS. 3, 4, and 5, the spill deflector 10 is provided with a hole 10b on the right side of the center into which the spring pin 11 is inserted, and the spring pin 11 is inserted from the outer periphery of the injector body 6. It penetrates the spill deflector 10 and prevents the spill deflector 10 from moving in the circumferential direction. Further, as can be understood from the exploded view of the spill deflector 10 in FIG. 5, bent pieces 10a are provided protrudingly at the four corners to prevent the oil from coming out of the oil reservoir 6a in the vertical direction. The bent piece 10a also serves to make the spill deflector 10 easier to handle during assembly and disassembly.

The material of the spill deflector 10 is spring steel, which is difficult to attack, and the position of the hole 10b into which the spring pin 11 is inserted is slightly to the right, avoiding the most intense part of the jet opposite the suction hole 5a. .

In this way, the spill deflector has a simple structure, which facilitates assembly and disassembly, and reduces costs.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a sectional side view of a unit injector embodying the present invention, and FIG. 2 is a plan view.

This unit injector is mainly composed of an injector body 6. An ear part 6b is made to protrude outside of the injector body 6, a fastening metal fitting 23 is engaged with the ear part 6b, and the fastening metal fitting is fastened to the cylinder head 22 with a long bolt 24. It is constructed so that it can be assembled and separated from two directions, from below and from above, with the injector body 6 in the center.

From below the injector turbo day 6 are the nozzle spring 13 and the nozzle spring seat 15.
is covered with a valve stop spacer 27, and a nozzle body 19 into which a nozzle valve 18 is fitted is arranged below, and is screwed onto the injector body 6 from below with a nozzle nut 20.

A check valve 9 and a check valve seat 8 are arranged from above the engine engine body 6.
After the spill deflector 10 is fixed with a spring pin 11, a barrel 5 is placed and screwed with a barrel holder 7. A check valve guide 6d is integrally constructed at the upper and lower branch portions of the injector turbo day 6, and serves as a partition between the injection pump section and the injection valve section and as a guide for the check valve 9. Plunger 3 is inserted into the cylinder hole in barrel 5.
, the plunger 3 passes through the tappet 1, and the plunger spring 4 is inserted into the tappet 1.
I am letting them receive it. The portion where the groove 1d on the outer periphery of the tappet 1 and the line 6h of the notched end surface of the injector body 6 match indicates that the plunger 3 has come out of the plunger suction port 5a and the compression stroke has begun.

A control lever 2 is directly connected to a protruding portion of the plunger 3 from the tappet 1 by a parallel pin 28.

An arm of a governor device is engaged with the control lever 2 .

The tappet 1 has a fan-shaped opening at its upper end with notched ends 1c, 1c having a horseshoe shape, from which a control lever 2 protrudes and is rotatable. An adjustment device is provided at the portion where the control lever 2 contacts the notch 1c of the tappet 1 so that the injection amount of the unit injectors of all cylinders becomes constant.

Further, a countersink hole 1b is provided in the horseshoe-shaped portion, and a tappet plate 21 is fitted into the countersink hole portion.

A rocker arm linked to a camshaft pushes the top surface of the tapepet plate 21 to push down the plunger. The plunger 3 is returned upward by the force of the plunger spring 4. Further, the tapepet 1 is provided with a vertical groove 1a, and an eccentric pin 25 is installed in the vertical groove 1a.
is inserted. The eccentric pin 25 is fixed to a rotating plate 25a with an elongated hole, and by loosening the bolt 26 and rotating the rotating plate, the tappet 1 is rotated via the eccentric pin 25, and the control lever 2 is rotated. The width of the movement is determined by the notch end 1 of the tapepet 1.
c and 1c to adjust the non-uniformity of the injection amount for each unit injector in the case of multiple cylinders. That is, the control lever is located at the notch end 1 of the tappet 1.
At the locations corresponding to c and 1c, adjustments are made during assembly so that the injection amount of each unit injector in a multi-cylinder system is constant.

Fuel is sucked through the oil passage 22a in the cylinder head and enters the oil sump 6a through the hole in the injector body 6. A spill deflector 10 for preventing erosion due to spill is fixed to the surface of the oil reservoir 6a facing the suction hole 5a by a spring pin 11. The fuel is then sucked in through the suction hole 5a as the plunger 3 of the cylinder inside the barrel 5 retreats upward. At this time, the check valve 9 is adsorbed to the check valve seat 8 and is in a sealed state to prevent the pushed-out pressure oil from returning.

When the tappet plate 21 is pushed by the rocker arm, the plunger 3 descends and the tip of the plunger 3 starts pumping fuel from the part where it deviates from the diameter of the suction hole 5a, until the inclined notch 3a reaches the diameter of the suction hole 5a. Pressure feeding ends when the Thereafter, even if the plunger is lowered, the fuel in the cylinder escapes from the oil passage 3b through the plunger through the inclined notch 3a. This inclined notch 3a
By rotating the plunger 3 with the control lever 2, the timing at which the injection valve meets the suction hole 5a is changed, and the injection amount is adjusted by adjusting the pumping time. The pressure-fed fuel passes through the oil passage 6c from the check valve 9, passes through the valve stop spacer 27, and enters the nozzle body 19. When the pressure reaches the opening pressure or higher, the nozzle valve 18 is moved by the nozzle spring 1.
3 and is pushed up and injected into the combustion chamber.

17 is a parallel pin for determining the position of the valve stop spacer 27 and the injector body 6. 16 is a parallel pin that determines the positions of the injector body 6, check valve seat 8, and barrel 5. 14 is a pressure adjustment plate, and 12 is an O-ring.

As described above, the present invention is a device for fitting an arc-shaped spill deflector 10 to an oil reservoir 6a on the inner surface of an injector turboday 6, which faces an intake hole 5a provided in a barrel 5 of a unit injector.
The tip of the spring pin 11 is inserted and fitted from the outer peripheral surface of the injector turboday 6 located in the oil passage 22a inside the cylinder head 22, and is engaged and fitted into a hole 10b that opens into a portion of the spill deflector 10 that avoids the position opposite the intake port 5a of the barrel 5, and is positioned and fixed to prevent the spill deflector 10 from moving in the circumferential direction, which provides the following effects.

First, unlike the conventional spill deflector described in Japanese Utility Model Application Publication No. 53-22916, there is no need to tighten the fit to prevent movement in the circumferential direction using only the spring force of the spill deflector. be. In addition, in the conventional technique, since the spill deflector 10 is fixed only by fitting with spring force, there is a risk that it may loosen due to some impact, be released from the fixed state, and move to the oil pool in the circumferential direction. In the present invention, since the spring pin 11 can securely position and fix the spill deflector 10, it is absolutely impossible to move it in the circumferential direction.

Second, the insertion hole of the spring pin 11 is open to the outer periphery of the engine turbo day 6,
Because fuel oil leaks from here, in a conventional fuel injection pump, it was not possible to lock the spring pin by inserting it independently from the fuel injection valve, but in the case of a unit injector, the injector turbo 6, a portion corresponding to the oil reservoir 6a is fitted into the cylinder head 22,
The outer periphery of the oil reservoir 6a of the injector turbo day 6 constitutes an oil passage for feeding fuel oil, so even if the hole for the spring pin 11 is opened in this area, the O
Since it is sealed by the ring 12 etc., there will be no oil leakage. By paying attention to this point, the spring pin 11 is inserted from the outside of the portion to lock the movement of the spill deflector 10 in the circumferential direction. This structure makes it possible to easily fix and assemble the spill deflector 10 to the injector body 6.

Thirdly, the hole 1b of the spill deflector 10 is
Since the position opposite to the suction hole 5a of the barrel 5 was avoided,
High pressure spills do not come out from the hole of the spring pin 11.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the unit injector of the present invention, Fig. 2 is a plan view, Fig. 3 is a plan sectional view of the spill deflector, Fig. 4 is a side view of the spill deflector, and Fig. 5 is the same. This is a developed diagram. 1... Tappet, 2... Control lever,
3... Plunger, 5... Barrel, 6... Injector body, 6d... Check valve guide, 7... Valve holder, 8... Check valve seat, 9... Check valve, 10... Spill deflector, 11 ...Spring pin, 13
... Nozzle spring, 18 ... Nozzle valve,
19... Nozzle body, 20... Nozzle nut,
21... Tappet plate, 23... Tightening metal fittings.

Claims (1)

[Scope of utility model registration request] A spill deflector 10 made of an arc-shaped plate is fitted into the oil reservoir 6a on the inner surface of the injector body 6 facing the suction hole 5a provided in the barrel 5 of the unit injector, and the cylinder head 22
The spring pin 1 is fitted and inserted from the outer peripheral surface of the injector body 6 located in the oil passage 22a inside.
1 to the barrel 5 of the spill deflector 10.
The spill deflector 1 is engaged with and fitted into a hole 10b which is opened in a portion avoiding the position opposite to the suction hole 5a of the spill deflector 1.
A deflector for a unit injector, characterized in that the deflector is positioned and fixed to prevent movement in the circumferential direction.