KR900009309Y1 - Starting engine control device of fuel injection pump for diesel engine - Google Patents

Abstract

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Description

Starting angle regulator of diesel fuel injection pump

1 is a cross-sectional view showing the configuration of a distribution type fuel injection pump.

2 is a conventional state of the art device for installing.

Figure 3 is a perspective view showing a coupling configuration of the piston and the adjustment shaft and the roller holder in the conventional advance device.

4 is a cross-sectional view of the adjustment device of the present invention.

5 is a cross-sectional view taken along the line A-A of FIG.

Figure 6 is a comparison table between the conventional configuration and the present invention.

* Explanation of symbols for main parts of the drawings

11: cylindrical slider 12: angle adjustment lever

13: spring 15: stud bolt

The present invention relates to a start-up control device of a hydraulic timer installed inside a dispensing fuel injection pump of a diesel engine to variably adjust the fuel injection timing according to the rotational speed of the engine.

Looking at the general function of the timer, the pressure generated in the plunger chamber by the driving of the fuel injection pump is a pressure wave is transmitted to the injection pipe at high speed to reach the nozzle.

The fuel injected from the nozzle is ignited and burned after passing the ignition delay time.

The time that the pressure wave propagates in the injection tube does not change much depending on the rotational speed of the engine. However, the higher the crank turning angle of the ignition delay, the higher the speed.

That is, the high speed side becomes shorter in the ignition delay time, but becomes larger in view of the frank angle, so that the crank angle that rotates from the pressure generation time of the plunger chamber to the ignition becomes larger as the speed becomes higher.

For this reason, it is necessary to speed up the injection time at high speed, that is, the time when pressure is generated in the injection pump, with respect to the engine crank angle so as to make the ignition time constant for a certain rotational angle to obtain the most appropriate combustion state.

The function of the timer is to change the phase between this period and the drive shaft of the injection pump to speed up the injection timing when the rotational speed increases and to delay the injection timing when the speed drops.

Looking at the forward operation of the distributor fuel injection pump (FIG. 1), as shown in FIG. 1, the fuel injection pump is supplied through a supply pump 1 composed of four vanes 2 in which the fuel of the fuel tank is driven by the fuel injection pump. Pulls fuel into me.

The fuel pressure inside the housing generally has a correlation with the number of revolutions (P = CV ^2, where P is the pressure, V is the speed, and C is the constant).

In addition, in the dispenser type injection pump, the advance characteristic of the timer A is determined by the hydraulic pressure, ie, the fuel pressure applied to the timer piston 4.

A conventional timer configuration is shown in FIG. 2 and includes a cam piston 5 connected to a timer piston 4 operated by fuel oil pressure generated inside the housing, a spring 3 assisting the return stroke, and a timer piston. It consists of a timer pin (6) that is a connecting rod to rotate.

Therefore, when the engine speed increases, the fuel oil pressure in the injection pump housing 7 rises and the timer piston 4 is pushed in the direction opposite to the engine rotation direction. On the contrary, when the hydraulic pressure drops, the timer piston 4 Is returned.

According to the movement of the timer piston, the timer pin 6 moves the roller holder 8 in the circumferential direction. When the rotational speed of the engine is increased and the pressure from the feed pump is increased, the roller holder 8 is cam. The injection timing is advanced by turning in the opposite direction of rotation of the disk.

However, in the use of such a conventional timer device, if the initial advance is increased for the purpose of improving startability including a cold lamp, the advance amount is increased by a certain amount in the entire rotational speed section, so that durability is weakened and pollution is generated, and thus exhaustion is gradually strengthened. There is a problem that it becomes difficult to satisfy the pollution regulations.

The present invention has been devised to compensate for such problems in the conventional timer device, and to devise an advancing control device to improve the startability including cold start of the engine while maintaining the basic performance of the timer bar, its purpose When described in detail by the accompanying drawings to solve the configuration as follows.

The upper part of the timer pin 6 is connected to the roller holder 8 which is installed in the pump housing 7 and can adjust the injection timing, and the lower end thereof is connected to the timer piston 4 in the cylinder, and one side of the timer piston 4 The cylinder spring (3) is extended so that the roller holder (8) and the cam disk (5) can advance the injection timing by the pressure from the supply pump (1). The cylindrical slider 11 is inserted into the inside thereof, and the advance adjustment lever 12 is supported by the spring 13 on the outside of the lid, and the advance adjustment lever 12 is inserted into the threaded hole 14 of the cylindrical slider 11. The stud bolts 15 are screwed together.

The present invention, as described above, adjusts the position of the cylindrical slider 11 by using the advance adjustment lever 12 at that time, and the return type spring 13 of the advance adjustment lever 12 reduces the original position after starting. It is to function.

Therefore, during initial start-up of the engine, the advance amount can be increased by operating the advance adjustment lever 12 to adjust the movement distance of the timer piston 4, while the slider and the lever are returned to their original positions by the return spring 13. To return.

The present invention has improved the acceleration control device compared to the conventional timer device while maintaining the basic performance of the timer, can easily solve the problems of cold start and poor start, and exhaust gas is gradually strengthened while improving the durability of the engine It is a useful design that can be easily adapted to the pollution control level without any device or countermeasure.

Claims (1)

By the stud bolt 15 of the advance control lever 12 which is formed by extending the cylinder rear end 10 of a conventional timer device and inserting a cylindrical slider 11 inside thereof and being supported by a spring 13 on the outside of the lid. A start-up angle control device of a diesel fuel distribution pump of a diesel engine that enables the forward and backward adjustment of the cylindrical slider (11) to increase the amount of advance at the initial start of the engine.