JP2577419Y2 - Deflector structure of row type fuel injection pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflector for a fuel injection pump for a diesel engine.

[0002]

2. Description of the Related Art Conventionally, a technique related to a deflector structure of a row type fuel injection pump has been known. For example, Japanese Utility Model Laid-Open No. 3-71163 and Japanese Utility Model Laid-Open No. 3-92.
No. 563 and Japanese Utility Model Laid-Open No. 3-104171.

[0003]

In the row type fuel injection pump, the mounting structure of the deflector has been a big problem compared to the conventional one. In a conventional barrel or support, a part of the cylindrical deflector is caulked and positioned, and is substantially fixedly installed between the cylindrical barrel and the barrel support having a flange. However, since the fuel spill is fixed, the position where the fuel spill is injected is the same position, and there is a problem that the portion is perforated. In the present invention, the position where the fuel spill is injected is not fixed by making the deflector cylindrical and rotatable.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. In claim 1, the control
Pinion, plunger barrel complete and deli
Injection element composed of Veri Valve Complete
Can be inserted and assembled into the pump body from above.
In the row-type injection pump, a deflector 2 is formed in a cylindrical shape and disposed between a step on the outer periphery of the barrel 1 and a step of the support 3 of the upper receiver 6 for receiving the plunger spring 20. Height b, barrel 1 and support 3
And smaller than the height a of the fitting portion formed between
The deflector 2 is in a loosely fitted state rotatable around the barrel 1.

[0005] In the second aspect, the cross-sectional view turned the lower end of the deflector 2 according to claim 1, wherein inward as viewed in cross-section "L"
It is configured in a mold portion 2a, and a portion of the "L" shape portion 2a in cross section is sandwiched between the lower surface of the barrel 1 and the upper surface of the support 3.

[0006]

Next, the operation will be described. The discharge pressure level of the fuel injection pump of the conventional diesel engine is low, and even if the deflector is fixed and the position where the fuel spill is injected is fixed, the degree of damage to the deflector is low. However, with the tightening of exhaust gas regulations, fuel injection pressure has tended to increase, and fuel spill pressure has also increased.
If the deflector remains fixed, the degree of damage / perforation of the part where the spill is jetted becomes severe, and there is a possibility that the perforation / damage of the deflector may develop into perforation / damage of the pump body. In the present invention, since the position where the spill is injected is constantly changed by making the deflector 2 a rotatable cylinder, the time until the perforation is increased,
It has become possible to prevent the occurrence of damage to the pump body.

[0007]

Next, an embodiment will be described. Figure 1 is a front sectional view showing a deflector structure column type fuel injection pump of the present invention, FIG. 2 is an enlarged sectional view of a deflector 2 parts of Figure 1, Figure 3 constitutes a deflector 2 in cross section "L" shaped FIG. 4 is an enlarged front cross-sectional view showing a configuration sandwiched between the supporter and the supporter.

Referring to FIGS. 1, 2 and 3, the overall structure of the deflector structure of the row type fuel injection pump will be described. The row type fuel injection pump of the present invention can be assembled by inserting the cam follower 11, the lower receiving member 8, the plunger spring 20, and other injection parts from above into the hole opened upward in the pump case 16. I have. Then, the cam 42 is rotated by the rotation of the pump shaft 18, and the cam follower 11 in contact with the cam 42 is moved up and down. The cam follower 11 is pivotally supported by a follower body 17,
The lower receiving member 8 is fitted into the follower body 17.

A plunger spring 20 is interposed between the lower receiver 8 and the upper receiver 6. The plunger spring 20 applies a downward force to the plunger 12 pushed up in the direction of the cam 42. Pump case 1
A governor rack 19 protruding from the governor device is slidably supported by 6. The control pinion 5 is engaged with the governor rack 19, and when the governor rack 19 slides by the governor rotation control function, the control pinion 5 rotates, and the lower portion of the control pinion 5 engages with the lower portion of the plunger 12. Therefore, the position of the plunger 12 can be finely adjusted and rotated with respect to the barrel 1. 9 is a delivery valve and 10 is a delivery holder.

When the plunger 12 is finely adjusted and rotated with respect to the barrel 1, the port 1 formed in the barrel 1 is rotated.
With respect to 5a and 15b, the relative positions of the injection start lead, the injection end lead, the drain lead, and the like engraved on the plunger change, and the injection discharge amount of the pump changes.
According to the present invention, the return oil passage 2 is provided from the ports 15a and 15b.
The present invention relates to a configuration of the deflector 2 that receives a high-pressure injection spill at the moment when the discharge is started to the discharge spill 2.

Conventionally, the reed has been constituted by a deflector plate fixed to each high pressure spill. However, since the spill is discharged from 800 to 900 kg / square centimeter to 1000 to 1100 kg / square centimeter in order to prevent the generation of nitrogen oxides in order to eliminate exhaust gas pollution, the conventional spill injection position However, the fixed deflector plate, in which the diameter was constant, was perforated immediately, and furthermore, the pump case 16 could be perforated. In order to solve this problem, the present invention is configured such that the deflector 2 is formed in a cylindrical shape and can be rotated gradually by the pressure of the spill.

The row type fuel injection pump of the present invention has a support structure, and the injection element can be incorporated from above. The injection element composed of control pinion 5, plunger barrel complete and delivery valve complete is
A row type fuel injection pump which can be inserted and assembled from above is shown. The flange portion is integrated, the deflector 2 of the present invention is inserted into the barrel 1, and a support 3 forming a fixed wall as an injection pump is provided below the deflector 2. The deflector 2 is rotatably inserted into the support 3, integrated with the barrel 1 with the fixing pin 4, the control pinion 5 is further inserted, and the support 3 and the positioning pinion 7 are integrated with the support 3 and the barrel 1. The injection element is formed by passing the lower receiving member 8 of the plunger spring 10 through the head of the plunger and fixing it through the retaining ring 9 provided below the control pinion 5 so that the plunger does not fall down. ing.

In the configuration shown in FIGS. 1 and 2, the cylindrical deflector 2 is fitted on the return oil passage 22 of the barrel 1 and the height b of the deflector 2 is set on the barrel 1. The height is smaller than the height a of the portion, and the deflector 2 is in a loosely fitted state around the barrel 1 so as to be rotatable.
As a result, the rotating power of the spill discharged in a state having a certain directionality acts on the deflector 2, and the deflector 2 rotates gradually.

However, if the deflector 2 is freely rotatable, the deflector 2 rotates to an unnecessary degree even in a normal case, which causes a problem. In the configuration shown in FIG. 3, the cross section of the deflector 2 is configured as an “L” -shaped portion 2 a in cross section , and is loosely held between the barrel 1 and the support 3. As a result, the deflector 2 can rotate, but performs fine rotation in balance with the rotational power of the spill.

[0015]

[Effects of the Invention] The present invention is constructed as described above, and has the following effects. As in claim 1, in a cylindrical shape
The height b of the configured deflector 2 is adjusted by the fitting portion of the barrel 1.
Of the barrel 1 is smaller than the height a of the barrel 1.
Around it, so that it can rotate freely.
The rotational power of the spill discharged in a state with
The deflector 2 acts on the reflector 2 gradually.
It turns. Thereby, the fixed position of the deflector 2
The spill is not injected into the
Also has considerable durability before the hole is opened in the deflector 2
It became possible to obtain .

Since the plunger is moved up and down, the deflector 2 has an "L" -shaped section 2a in sectional view.
The deflector can be turned at a small angle by a small angle by the balance between the pressing force of the part and the turning energy due to the spill flow at the time of fuel spill. Thus, the problem caused by the rotation of the deflector 2 could be eliminated.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a deflector structure of a row type fuel injection pump of the present invention.

FIG. 2 is an enlarged sectional view of a deflector 2 shown in FIG.

FIG. 3 is an enlarged front cross-sectional view showing a configuration in which a deflector 2 is formed in an “L” shape in cross-section and held between a deflector 2 and a supporter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Barrel 2 Deflector 2a Sectional "L" shape section 3 Support 4 Fixing pin 5 Control pinion 6 Upper catch 7 Positioning pinion 8 Lower catch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02M 59/26 330 F02M 59/44

Claims (2)

(57) [Scope of request for utility model registration] 1. A control pinion, a plunger / ba
Complete rel and complete delivery
The injection element composed of
In a row type injection pump that can be inserted and assembled from the top,
The deflector 2 is configured and arranged in a cylindrical shape between the step on the outer periphery of the barrel 1 and the step of the support 3 of the upper receiving member 6 for receiving the plunger spring 20, and the height b of the deflector 2 is The deflector 2 is smaller than the height a of the fitting portion formed between the barrel 1 and the support 3, and the deflector 2 is
A deflector structure for a row-type fuel injection pump, wherein the deflector structure is a loosely fitted state rotatable around the fuel injection pump. 2. A lower end portion of the deflector 2 according to claim 1 is formed into an “L” -shaped portion 2a which is bent inward in a cross-sectional view .
The cross section between the lower surface of the barrel 1 and the upper surface of the support 3
A deflector structure for an in-line fuel injection pump, characterized in that a portion of a visual "L" -shaped portion 2a is sandwiched.