JPH03182654A - Device of reducing generating smoke during rapid acceleration of diesel engine - Google Patents

Abstract

PURPOSE:To reduce an amount of generating smoke even when rapid acceleration operation is effected by a method wherein when au engine temperature is increased to a given value, a temperature sensitive operating tool is moved in the moving regions of a fork lever and a control rack and received in a maximum fuel injection position. CONSTITUTION:A temperature-sensitively operated type fuel limit tool 21 formed of a bimetal is arranged facing the rocking region of a fork lever 10, and a receiving part 22 for the fuel limit tool 21 is formed to the side of the fork lever 10. The fuel limit tool 21 is moved aside from the rocking region of the fork lever 10 while temperature is below a set value. When temperature is increased to a set value, the fuel limit tool is moved in the rocking region of the fork lever 10 and brought into contact with the receiving part 22 and it is limited that the fork lever 10 is moved over the maximum fuel injection position of a control rack 9 to the fuel increase side. During running of an engine, an engine temperature is increased, the control rack 9 is prevented from overrun, the feed of fuel to a combustion chamber is limited, and the generation of smoke due to surplus fuel can be suppressed.

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 diesel engines, 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, a fork lever that engages the governor lever with the control rack and a governor spring are used. 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 received by a fuel restriction bin, and a fork lever is fitted with a spring lever. A fork lever and a spring lever are interlocked and connected by a torque spring in order to activate the start spring and increase the stickiness of the engine under heavy loads (Utility Model No. 62-82345).
Publication No.).

(Problem to be solved) However, with conventional governor devices, when sudden acceleration is performed, the tension of the governor spring increases rapidly, but since the engine speed is low at that time, it does not act on the fork lever. The governor force that is being used only outputs a force that corresponds to the actual rotation speed.

As a result, the balance between the governor spring force and the governor force is disrupted, and the governor lever moves greatly toward the fuel increase side. During this movement, the spring lever is caught by the fuel limiting bin, but the spring lever and fork lever torque Since they are linked via a spring, the accumulated pressure of the torque spring causes the fork lever to overhang from the maximum fuel injection position to the fuel increase side, causing an abnormal increase in the amount of fuel delivered from the fuel injection pump. There was a problem that smoke could occur.

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 arranges a temperature-sensitive operating device such as a bimetal or a thermostat in correspondence with the moving area of the fork lever or control rack, so that the engine temperature is maintained at a predetermined level. When the temperature reaches , the temperature-sensitive actuator is advanced into the movement area of the fork lever and hunt roll rack to receive the fork lever and hunt roll at the maximum fuel injection position.

(Function) In the present invention, a temperature-sensitive actuator such as a bimetal or a thermostat is arranged in correspondence with the movement area of the fork lever or control rack, and when the engine temperature reaches a predetermined temperature, the temperature-sensitive actuator is moved to the fork lever. The fork lever and control are positioned within the movement area of the fork lever and control rack, and are configured to receive the fork lever and control at the maximum fuel injection position. The tool is in the advanced position,
Even if you operate the accelerator lever and suddenly accelerate the engine,
Since the control rack is received at the maximum fuel injection position by the temperature-sensitive actuator directly or via the fork lever, the control rack does not exceed the maximum fuel injection position and overrun to the starting fuel increase side.

On the other hand, when the engine is started, the temperature of the engine is below the set temperature, so the temperature-sensitive actuator is retracted from the movement area of the fork lever and control rack, and does not interfere with the starting operation.

(Embodiment) The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view taken out of the main part, Fig. 2 is a longitudinal sectional view of the fuel injection amount control device part,
FIG. 3 is a plan view thereof.

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).
) is fitted over the governor sleeve (7) so as to be movable in the axial direction of the governor shaft, and moves in and out as the governor weight (W), which is supported by the weight holder (6) so as to be swingable and openable, moves in and out as the governor weight (W) swings open and close. ) can be controlled to move the fuel injection pump (3) to the control rack (9) via the governor lever (8).

The governor lever (8) is a fork lever (10) that is engaged with the rack pin (9a) of the hunt roll rack (9).
and a spring lever (12) that locks one end of the governor spring (11), and applies the thrust force (governor force) (F) of the governor sleeve (7) to the fork lever (10). the fork lever (10) and spring lever (1).
2) are configured to interlock with each other via a torque spring device (13), and the control rack (9) of the fuel injection pump (3) is controlled by the balance between the governor force (F) and the governor spring force (Gs). That's what I do.

A speed regulating lever (15) is swingably supported on a pump chamber lid (14) arranged to cover the side opening of the pump housing chamber (2), and a governor spring is attached to the speed regulating lever (15). (11) The other end is engaged. In addition, the lever shaft (16) of the speed regulating lever (15) is connected to the pump chamber cover (14).
), and a transmission lever lever 17) is fixed to its outer end.

As shown in Fig. 4, the fork lever (10) is slidably attached to the tip of the lever arm (10a) and the lever arm (10a), which swing in response to the governor force (F). The rack pin (9a) of the controller (9)
) to the lever arm part (10a) and the thrust lever (10a).
By sandwiching it in b), the response sensitivity of the governor is increased. And this thrust lever (10b)
A start spring (19) that biases the control rack (9) toward the fuel increase side (R) is engaged between the pump chamber wall (18) located on the fuel increase side (R) of the control rack (9). It's a dress.

Further, an idle limit spring (20) is arranged on the fuel reduction side (L) of the thrust lever (10b) to prevent the control rack (9) from accidentally moving to the no-fuel injection position.

A temperature-activated fuel limiter (21) made of bimetal is arranged to correspond to the swing area of the fork lever (10), and the fuel limiter (21) is received on the side of the fork lever (10). A stop portion (22) is formed. This fuel limiter (21) operates on the fork lever (
When the temperature reaches the set temperature, the fork lever (10) moves into the swing area of the fork lever (10) and the receiving part (
22) to restrict the fork lever (10) from moving toward the fuel increase side beyond the maximum fuel injection position of the control rack (9). and,
The receiving portion (22) is formed in a wedge shape on the side surface of the thrust lever (10a), with the side wall on the fuel increase side forming an inclined surface.

The symbol (23) in the figure is a fuel restriction pin (24) that restricts the movement of the spring lever (12) toward the fuel increase side (R).
is an engine stop lever that forcibly moves the control rack (9) to the no-fuel injection position.

FIG. 5 shows a modified example, in which the temperature-sensitive fuel restrictor (21) is formed of a thermal cylinder using thermowax. Note that a shape memory alloy or a shape memory resin may be used as the temperature sensitive actuator (21).

6 and 7 show another embodiment of the present invention. The one shown in FIG. 6 has an engine stop operation solenoid (25) arranged corresponding to the control rack (9), The operating solenoid (25)
), a temperature-sensitive actuator (21) formed of a shape memory alloy coil is arranged around the temperature-sensitive actuator (21).
) is in the contracted position while the temperature is lower than the transformation temperature, and when it becomes higher than the transformation temperature, the position is changed to the extended position and the control rack (9) is received at the maximum fuel injection position. In addition, the one shown in Fig. 7 uses a bimetallic temperature-sensitive actuator (instead of a shape-memory alloy coil).
21) is arranged. Although not shown in the drawings, a thermal cylinder made of a material with a large coefficient of thermal expansion, such as thermowax, may be used.

In the fuel injection amount limiting device configured in this way, when the gear shift lever (17) is operated to suddenly accelerate from a low rotation speed range, the governor spring force (Gs) increases, but since there is a slight delay in increasing the engine rotation speed, the governor spring force (Gs) increases. The balance between the force (F) and the governor spring force (Gs) is lost, and the spring lever (12) and fork lever (10) are moved to the fuel increase side (R). At this time, the spring lever (I
2), even after the spring lever (12) is caught by the fuel restriction bin (25), the fork lever (10) is still moved by the accumulated force of the torque spring of the torque spring device (13). However, since the engine temperature is rising during engine operation, the temperature-sensitive actuator (21) switches to the operating position and moves into the swing area of the fork lever (10) or the control rack (9). ), the control rack (9) is received directly or via the fork lever (10) at the maximum fuel injection position. This allows the control rack (9)
The fuel injection amount will be limited because the fuel injection amount will not exceed the maximum fuel injection position and overrun to the fuel increase side. Therefore, a limited amount of fuel is supplied to the combustion chamber of the engine, which prevents excess fuel and suppresses the occurrence of smoke.

(Effects) The present invention arranges a temperature-sensitive actuator such as a bimetal or thermostat in correspondence with the moving area of the fork lever or control rack, and when the engine temperature reaches a predetermined temperature, the temperature-sensitive actuator is moved to the fork lever. The temperature-sensitive actuator is moved into the movement area of the fork lever and control rack, and is configured to receive the fork lever and control at the maximum fuel injection position. Because it is in the extended operating position, even if the accelerator lever is operated to suddenly accelerate the engine, the control rack will be held at the maximum fuel injection position by the temperature-sensitive actuator either directly or via the fork lever. . This prevents the control rack from exceeding the maximum fuel injection position and overrunning toward the starting fuel increase side, thereby suppressing the occurrence of smoke.

On the other hand, when the engine is started, the engine temperature is below the set temperature, so the temperature-sensitive actuator is retracted from the movement area of the fork lever and control rack, making it impossible to move the control rack to the starting increase position. It is possible to do so without interfering with the starting operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a plan view of the main parts taken out, and FIG. 2 being a longitudinal cross-sectional view of the fuel injection amount control device.
Figure 3 is a plan view thereof, Figure 4 is a perspective view of the main parts of the fork lever, Figure 5 is a modified example equivalent to Figure 1, Figures 6 and 7.
Each figure is a diagram corresponding to FIG. 1 of another embodiment. 3... Fuel injection pump, 8... Governor lever, 9...
...Control rank, 10...Fork lever,
DESCRIPTION OF SYMBOLS 11... Governor spring, 12... Spring lever, 13... Torque spring device, 15... Speed regulating lever, 21... Temperature-sensitive operating tool.

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)
In a diesel engine equipped with a governor device which is interlocked with 2) and 2) via a torque spring device (13), a temperature-sensitive actuator (2) that operates by detecting the engine temperature is used.
1) is arranged to correspond to the swinging area of the fork lever (10), and when the engine temperature reaches the set temperature,
A diesel engine characterized in that a temperature-sensitive actuator (21) is configured to advance into a swing area of a fork lever (10) and receive the fork lever (10) at the maximum fuel injection position of a control rack (9). Control rack (9) for smoke reduction device 2 and fuel injection pump (3) during sudden acceleration
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)
In a diesel engine equipped with a diesel engine governor device in which the 2) and 2) are interlocked and connected via a torque spring device (13), a temperature-sensitive actuator (21) that detects the engine temperature and operates is mounted on a control rack (9). ), and when the engine temperature reaches the set temperature, the temperature-sensitive actuator (21) advances into the movement area of the control rack (9) and moves the control rack (9) to the maximum fuel injection position. A device for reducing smoke during rapid acceleration of a diesel engine, characterized in that it is configured to catch smoke at the time of sudden acceleration.