JPH03182653A - Device for reducing generating smoke amount during rapid acceleration of diesel engine - Google Patents

Abstract

PURPOSE:To reduce an amount of generating smoke even when rapid acceleration is effected by a method wherein an engaging part on the fuel injection pump containing chamber side with which the one end part of a start spring is engaged is formed with a temperature sensitive operating tool displaced to the fuel reduction side during high temperature operation. CONSTITUTION:A spring engaging part 21 to which the one end of a start spring 19 is locked on a pump containing chamber wall 18 is formed of, for example, a bimetal. The engaging part 21 is brought into a state extending along the pump containing chamber wall 18 while temperature is low, and it is displaced to the fuel reduction side as temperature is increased. When temperature is increased along with running of an engine, the engaging part 21 on the pump containing chamber side of the start spring 19 is displaced to the fuel reduction side and a start spring force exerted on a fork lever 10 is decreased. Even when, with this state, a shift lever 17 is caused to effect rapid acceleration operation, the fork lever 10 is moved by means of a pressure storage force of a torque spring device 13, an overrun amount is decreased, and an amount of generating smoke is suppressed to a value as low as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for reducing smoke generated when a diesel engine is rapidly accelerated.

(Prior art) In a diesel engine, the amount of movement of the control rack of the fuel injection pump is adjusted by balancing the governor force from the governor weight attached to the rotating shaft of the engine with the governor spring force acting on the governor lever. The engine speed is controlled by controlling the amount of fuel injection, but conventionally, in order to start the engine smoothly, the fork lever that engages the governor lever with the front roll rack and the governor spring act together. In order to be able to supply a larger amount of fuel to the combustion chamber than the maximum fuel injection amount during operation when starting the engine, the spring lever is not supported by a fuel restriction bin, and the fork In order to apply a start spring to the lever and increase the stickiness of the engine under heavy loads, a fork lever and a spring lever are interlocked and connected by a torque spring. 82345
Publication No.).

(Problem to be solved) However, with the conventional governor spring device, when sudden acceleration is performed, the tension of the governor spring increases rapidly, but since the engine speed in that case is low, the fork lever The governor force that is acting only produces a force that corresponds to the actual rotation speed.

As a result, the balance between the governor spring force and the governor force is lost, and the governor lever moves significantly toward the fuel increase side. During this movement, the spring lever is stopped by the fuel restriction bin, but the spring lever and fork lever Since this is linked via a torque spring, the combined force of the accumulated force of the torque spring and the spring force of the start spring acts on the fork lever, causing the fork lever to increase the amount of fuel from the maximum fuel injection position. There is a problem in that the amount of fuel supplied from the fuel injection pump may be abnormally increased and smoke may be generated due to overhanging the fuel injection pump.

The present invention has been made with attention to such points, and an object of the present invention is to reduce the amount of smoke generated even when there is a sudden acceleration operation.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a mechanism in which an engaging part on the side of the fuel injection pump housing chamber that engages one end of the start spring is displaced toward the fuel decreasing side at high temperature. It is characterized by being constructed with a heating tool.

(Function) In the present invention, the engaging part on the side of the fuel injection pump accommodating chamber that engages one end of the start spring is constituted by a temperature-sensitive actuator that moves toward the fuel reduction side when the temperature is high. When starting the engine at low engine speed, the engaging part of the start spring on the pump chamber wall side is located on the fuel increase side.
Although the start spring has sufficient spring force and can perform the start increase operation reliably, the engine temperature rises during engine operation and the start spring pump becomes hot. The chamber wall side engaging portion is displaced toward the fuel reduction side, thereby reducing the spring force of the start spring.

Therefore, by increasing the governor spring force by sudden acceleration operation, the governor lever is forcibly displaced to the fuel increase side, and after the spring lever is stopped by the fuel limit bottle, the start spring force that cooperates with the torque spring force is applied. This means that the control rack will not exceed the maximum fuel injection position and overrun to the starting fuel increase side.

(Embodiment) The drawings show an embodiment of the present invention, with FIG. 1 being an explanatory view taken out of the main parts, and FIG. 2 being a longitudinal sectional view of the fuel injection amount control device portion.

This fuel injection amount control device is suitable for diesel engines (E).
A fuel injection pump (3) is arranged in the pump accommodation chamber (2), and a fuel injection camshaft (
4) and a governor shaft (5), the fuel injection camshaft (4) and governor shaft (5) are interlocked and connected to a crankshaft (not shown), and a weight holder (6) is arranged on the governor shaft (5). ), and also attach the governor sleeve (7) to the governor shaft (5).
A governor sleeve ( 7), the fuel injection pump (3) can be controlled and moved to the control rack (9) via the governor lever (8).

The governor lever (8) is a fork lever (10) engaged with a rack bin (9a) of a control rack (9).
and a spring lever (12) that locks one end of the governor spring (11). ), as well as the fork lever (10) and spring lever (
12) Equipped with a torque spring! (13), and the fuel injection pump (3)
This is to control the control rack (9). A speed regulating lever (15) is swingably supported on the pump chamber lid disposed to cover the side opening of the pump housing chamber (2), and a governor spring (11) is attached to the speed regulating lever (15). The other end is engaged. Further, the lever shaft (16) of the speed regulating lever (15) passes through the pump chamber cover, and a speed change lever disposed at its outer end is fixed.

In addition, the fork lever (10) is a governor force (F
) and a thrust lever (10b) slidably attached to the tip of the lever arm (10a). 9a) to the lever arm part (
10a) and the thrust lever (10b), the response sensitivity of the governor is increased. The thrust lever (10b) and the pump housing wall (
A start spring (19) that biases the control rack (9) toward the fuel increase side (R) is engaged between the thrust lever (10b) and the fuel 11id.
lt(fil(L) is the idle limit spring (
20) is arranged to prevent the control rack (9) from accidentally moving to the no-fuel injection position.

Start spring (19) on pump housing wall (18)
The spring engaging portion (21) that locks one end of the spring is made of bimetal. While the temperature is low, this bimetallic spring engaging portion (21) is in a state along the pump housing chamber wall (18) as shown in FIG. 1(a), and as the temperature rises, as shown in FIG. As shown in (b), it is configured to be displaced toward the fuel reduction side.

Therefore, when the temperature rises as the engine is operated, the engaging portion (21) of the start spring (19) on the side of the pump accommodating chamber is displaced toward the fuel reduction side, which causes the start spring to act on the fork lever (10). power will be reduced. Therefore, when the gear shift lever (17) is operated for sudden acceleration, the governor spring force (Gs) increases rapidly and moves the governor lever (8) to the fuel increase side, but at this time, the spring lever (12) Since the receiver is stopped by the fuel limiting pin (23) at the position corresponding to the injection position, the fork lever (10) is then moved to the fuel increasing side ( R), but as mentioned above, the spring force of the start spring (19) has decreased, so the torque spring device (
13), the amount of overrun is reduced, and smoke generation is suppressed as much as possible.

3 to 5 show modified examples of the present invention, and FIG. 3 shows the pump chamber wall (19) of the start spring (19).
The spring engaging part (21) on the pump chamber wall (18) side of the start spring (19) is formed of a shape memory alloy. is made of a cylinder whose operating source is a material with a large coefficient of thermal expansion such as thermowax, and the one shown in Figure 6 is a solenoid that operates based on the temperature detected by a temperature sensor (24) and a start spring. (19) Spring engagement part on the pump chamber wall (18) side (
21).

FIGS. 6 and 7 show another configuration for suppressing overrun of the control rack (9) toward the fuel increase side.
The figure shows a rack retraction spring (26) disposed between the fuel reduction side end of the control rack (9) and the fuel reduction side wall (25) of the pump chamber (2).
26) on the side of the pump chamber wall (25) is constituted by a solenoid (27), and a temperature switch (29) that conducts at high temperature is interposed in the power supply path (28) to this solenoid (27). Note that the reference numeral (30) is a power source such as an alternator. With this configuration, when the engine temperature rises, the temperature switch (29) becomes conductive and the solenoid (27) operates to move in and out of the rack. Retraction spring (26
) increases, biasing the control rack (9) toward the fuel reduction side. Therefore, it is possible to prevent the control rack (9) from overrunning from the maximum fuel injection position toward the increase side during a sudden acceleration operation.

Figure 7 is a modification of the one shown in Figure 6, which is
In addition to the temperature switch (29), the power supply path (28) to the soleno f.
2) are arranged in series. With this configuration, the solenoid (27
), and the solenoid (27) is energized for a certain period of time only during rapid acceleration operations at high temperatures, eliminating unnecessary operation of the solenoid (27).

(Effects) In the present invention, the engaging part on the side of the fuel injection pump accommodating chamber that engages one end of the start spring is configured with a temperature-sensitive actuator that moves toward the fuel reduction side when the temperature is high. When the engine is started at a low temperature, the engaging part of the start spring on the pump chamber wall side is located on the fuel increase side, so the start spring has sufficient spring force to ensure the start increase M1 operation without any hindrance. However, during engine operation, the start spring tension is reduced to prevent the control rack from overrunning beyond the maximum fuel injection position to the starting fuel injection side due to sudden acceleration operations. It is possible to suppress the occurrence of smoke at times.

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, FIG. 1 is an explanatory view of the main parts taken out, FIG. 2 is a vertical sectional view of the fuel injection amount control device, and FIGS. 3 to 5 are The first example showing a modification of the present invention
FIGS. 6 and 7 are views corresponding to FIG. 1 showing another configuration for suppressing overrun of the control rack toward the fuel increase side. 2...Fuel injection pump housing chamber, 3...Fuel injection pump, 8...Governor lever, 9...Control rack, 10...Fork lever, 11...Governor spring, 12...Spring lever , 13...torque spring device, 15...speed regulating lever, 18...(
2) fuel increase side wall surface, 19...start spring, 21...(19) engagement portion on the side of the pump housing chamber.

Claims (1)

[Claims] 1. Control rack (9) for fuel injection pump (3)
a fork lever (10) that engages with the speed control lever (10);
5) and a spring lever (12) interlocked and connected via a governor spring (11) constitute a governor lever (8), and a fork lever (10) and a spring lever (1)
2) are interlocked and connected via a torque spring device (13), and a start spring (19) is stretched between the fork lever (10) and the fuel increase side wall surface (18) of the fuel injection pump housing chamber (2). In a diesel engine equipped with a governor device, the temperature-sensitive operation displaces the engaging part (21) on the side of the fuel injection pump housing chamber, which engages one end part of the start spring (19), toward the fuel reduction side when the temperature is high. A device for reducing smoke during rapid acceleration of a diesel engine, characterized in that it is composed of a