JPS591101Y2 - Fuel injection pump injection restriction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection amount limiting device for a fuel injection pump, which has functions for limiting the amount of fuel oil in the fuel injection pump, and for starting and increasing the amount of fuel.

In conventional fuel injection pumps used in diesel engines, etc., there are no fuel injection pumps that are equipped with an injection amount limiting device, and the injection amount is limited by a lever that rotates a plunger to adjust the injection amount. This is done by applying restrictions from the outside.

Therefore, the limit on the injection amount can be set only after the pump has been assembled into the easel engine, etc., and the setting work is often difficult and the setting accuracy is also poor.

Furthermore, since the injection amount is restricted from the outside, the structure is complicated and the restriction device requires a large space.

Therefore, in order to eliminate the above-mentioned conventional drawbacks, the present invention aims to set a limit on the injection amount in the fuel injection pump alone, thereby making the internal combustion engine more compact and reducing the manufacturing cost. be.

That is, the present invention consists of an injection amount limiting device in which a cylindrical stopper member having an inclined notch that contacts the control lever is fitted onto the outer periphery of the fuel injection pump body via an elastic body so as to be movable up and down. However, it is a preferable configuration that the inclined notch is formed in a curved line.

Embodiments of the present invention will be described below with reference to the drawings.

First, to briefly explain the side sectional view of the fuel injection pump according to the first embodiment of the present invention shown in FIG. The plunger 5, which is slidably fitted in the plunger 5, is moved up and down by the rotation of a fuel cam (not shown), thereby discharging high pressure fuel oil from the high pressure oil discharge lower to the injection valve (not shown) via the discharge valve 6. Sent as .

Further, the fuel injection amount can be adjusted by rotating the plunger 5 with the control lever 8 via the collar 9.
This is done by changing the height position of an inclined notch (not shown) provided on the plunger 5.

Therefore, as the injection amount limiting device of the present invention, the pump body 10
After fitting a leaf spring type torque spring 12 as an elastic body shown in FIG.
It is supported by a retaining ring 13 as shown in the perspective view of FIG.

The state is as shown in the side view of FIG. 2, and the set load of the torque spring 12 is determined by the dimension 1□.

Next, a set plate 1 having a long hole as shown in FIG.
4 into the opening of the stopper 11.

When the set plate 14 is moved left and right, the stopper 11 also slides on the outer circumference of the pump body 10 at the same time, so when the control lever 8 reaches the limit position, the stopper 11
After positioning the set plate 14 so that it just contacts the inclined notch 11a provided in the set plate 11, fix it to the pump body 10 with a set screw 15 through the elongated hole of the set plate 14, as shown in FIG. do.

Therefore, in FIG. 2, the arrow direction A on the left side of the control lever B indicates the increasing side of the injection amount, and the arrow direction B on the right side indicates the decreasing side of the injection amount.

Therefore, the control lever 8 comes into contact with the inclined notch 11a of the stopper 11, and the amount of fuel injected at the maximum output during normal operation is limited.

On the other hand, at the time of starting and increasing the amount of fuel, the stopper 11 compresses the torque spring 12 and is pushed upward as shown in FIG. The control lever 8 moves to the increasing side A, and the amount of fuel injected is increased.

In the first embodiment, a leaf spring type torque spring 12 as shown in FIG. 5 is used as the elastic body, but the second embodiment
Any elastic material that maintains the dimension 1 shown in the figure is effective.

Next, a second embodiment of the present invention will be explained with reference to FIGS. 8 and 9. The same parts as in the first embodiment are indicated by the same part numbers. Whereas the section 11a is a straight line, in the second embodiment, a curved inclined notch 11a' is provided, and as the control lever 8 moves to the increasing side A, the inclined notch 1
Since the inclination angle of 1a' changes, the amount of vertical movement of stopper 11' can be reduced.

That is, there is an advantage that the spring force of the torque spring 12 can be prevented from becoming excessive even at the time of starting.

In addition, in the injection quantity limiting device of the present invention, a cylindrical stopper 11 is provided so as to be movable up and down via an elastic body, but a system in which this stopper 11 is slid in the circumferential direction via an elastic body is also considered. However, compared to that case, the method of the present invention has the advantage that the elastic body to be used can be selected from a wide range of spring materials.

Therefore, if a fuel injection pump equipped with the injection amount limiting device of the present invention is used, there is an advantage that the injection amount limit can be set for the fuel injection pump alone, and this allows for easier assembly work on the assembly line when manufacturing the fuel injection pump. This is effective in shortening the assembly time because it simplifies the process and does not require a reduction in the speed of the assembly line.

In addition, the external dimensions of the fuel injection pump itself can be kept to approximately the same size as conventional models, and no extra space is required for the injection amount setting device, so the internal combustion engine to which it is assembled can be made more compact. There are advantages.

Furthermore, since the injection amount limiting device of the present invention has a simple structure, it is extremely effective in reducing the manufacturing cost of the fuel injection pump.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a fuel injection pump according to Embodiment 1 of the present invention, Fig. 2 is a side view of the main part of the fuel injection pump in a state where the stopper and control lever shown in Fig. 1 are in the restricted position, and Fig. 3 is the same as that shown in Fig. 1. Fig. 4 is a side view of the main parts showing the positions of the stopper and control lever at the time of starting and increasing the amount in Embodiment 1, Fig. 5, Fig. 6, and Figure 7 is a perspective view of the torque spring, stopper, and retaining ring in Figure 1, respectively, Figures 8 and 9 are the stopper and control lever in Embodiment 2 of the present invention, respectively, at the limit position, starting, and increasing. FIG. 4...Bar lever, 5...Plunger 8...Control lever, 10...Pump body, 11.1
1'... Stopper, 11 a, 11 a'...
Inclined notch, 12... Torx screw 1 ring, 13...
Retaining ring, 14... Set plate, 15... Set screw.

Claims (1)

[Claims for Utility Model Registration] 170 In an injection amount limiting device for a fuel injection pump that adjusts the amount of fuel injected by rotating a plunger with a control lever, an inclined notch of a predetermined length is provided on the outer periphery of the pump body. A cylindrical stopper member having a cylindrical stopper member can be rotated and moved up and down (an elastic member is inserted between the upper end of the cylindrical stopper member and the pump body and constantly urges the cylindrical stopper member downward. At the same time, a set plate whose position can be adjusted freely for regulating the rotational position of the cylindrical stopper member is provided in the notch, and a controller for adjusting the injection amount of the fuel is provided in the inclined notch. l
- An injection amount limiting device for a fuel injection pump, characterized in that a roll lever is arranged so as to be able to come into contact with it. 2. The injection amount limiting device for a fuel injection pump according to claim 1, wherein the inclined notch that comes into contact with the control lever is formed in a curved line.