JPH0826781B2 - Smoke reduction device during rapid acceleration of diesel engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for reducing smoke generated when a diesel engine is rapidly accelerated.

<Prior art> In diesel engines, the control rack movement is adjusted by balancing the governor force from the governor weight attached to the engine rotation shaft with the fuel injection pump control rack and the governor spring force acting on the governor lever. Although the engine speed is controlled by controlling the fuel injection amount, conventionally, in order to smoothly start the engine, the fork lever and the governor spring that engage the governor lever with the control rack are operated. The spring lever is received by the fuel limit pin and started on the fork lever so that more fuel than the maximum fuel injection amount during operation can be supplied to the combustion chamber when the engine is started. With the spring acting, and with a heavy load There is provided a fork lever and a spring lever which are interlockingly connected by a torque spring in order to make the engine sticky (Japanese Utility Model Publication No. 62-82345).

《Problem to be solved》 However, in the conventional governor device, when a sudden acceleration operation is performed, the tension of the governor spring increases sharply. The governor force is only producing a force corresponding to the actual speed. For this reason, the balance between the governor spring force and the governor force is lost, and the governor lever moves greatly toward the fuel increase side.At this time, the spring lever is received by the fuel limit pin, but the spring lever and the fork lever are different from each other. Since it is linked via the torque spring, the fork lever is overhung from the maximum fuel injection position to the fuel increase side by the accumulated pressure of the torque spring and the tension of the start spring, and the fuel is fed from the fuel injection pump. There was a problem that the amount was abnormally increased and smoke was generated.

The present invention has been made by paying attention to such a point, and an object thereof 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 temperature-sensitive operating tool such as a bimetal, a shape memory alloy, a thermowax-filled cylinder, etc., which operates by detecting the engine temperature. It is placed in the engine stop operation system from the input side of the control rack to the control rack, and when the engine temperature reaches the set temperature, the temperature sensitive actuator operates to regulate the shift of the control rack to the fuel increase side. It is characterized by being configured in.

<< Operation >> In the present invention, a temperature-sensitive operating tool that detects and operates the engine temperature is arranged in the engine stop operation system between the input side of the engine stop lever and the control rack so that the engine temperature reaches the set temperature. As a result, the temperature-sensing actuator operates to regulate the shift of the control rack to the fuel-increasing side.Therefore, during normal operation, the engine temperature is above the set temperature. The actuating tool is in the actuated position, and the output side end of the engine stop operating lever plunges into the movement area of the stop engaging portion and receives this stop engaging portion at a position corresponding to the maximum fuel injection position. . Therefore, even if the engine is suddenly accelerated by operating the accelerator lever, the control rack will be held at the maximum fuel injection position by the temperature-sensitive operating tool. Will never overrun. On the other hand, since the temperature of the engine is below the set temperature when the engine is started, the temperature-sensitive operating tool is in the standby posture, and the output side end of the engine stop operating lever is retracted from the moving area of the stop engaging part. Therefore, since the movement of the control rack is not limited, the control rack can be moved to the start increasing position, and the start operation is not hindered.

<< Practical Examples >> The drawings show an embodiment of the present invention. FIG. 1 is a perspective view showing a main part taken out, FIG. 2 is a longitudinal sectional view of a fuel injection amount control part, and FIG.
FIG. 4 is a perspective view showing an interlocking portion between the governor lever and the control rack, and FIG. 4 is a cross-sectional plan view of the fuel injection amount control portion.

This fuel injection amount control device has a fuel injection pump (3) arranged in a pump housing chamber (2) of a diesel engine (E), and a fuel injection camshaft (4) and a governor shaft in the pump housing chamber (2). (5), and the fuel injection camshaft (4) and the governor shaft (5) are connected to a crankshaft (not shown).
The weight holder (6) is fixed to the governor shaft (5), and the governor shaft (5) is fitted with the governor sleeve (7) so as to be movable in the axial direction of the governor shaft. The amount of movement of the governor sleeve (7) that moves back and forth with the opening and closing swing of the governor weight (W) that is swingably opened and closed by (6) is controlled by the fuel injection pump (3) via the governor lever (8). The control rack (7) is configured to be controllably movable.

The governor lever (8) is composed of a fork lever (10) engaged with the rack pin (9a) of the control rack (9) and a spring lever (12) locking one end of the governor spring (11). The thrust force (governor force) (F) of the cabana sleeve (7) acts on the fork lever (10), and
The fork lever (10) and the spring lever (12) are interlocked via a torque spring device (13), and the governor force (F) and the governor spring force (Gs)
The control rack (9) of the fuel injection pump (3) is controlled in balance with the above. Then, a speed control lever (15) is swingably supported on a pump chamber lid (14) arranged so as to cover the side opening of the pump storage chamber (2), and a governor spring is attached to the speed control lever (15). The other end of (11) is engaged. Further, a lever shaft (16) of the speed control lever (15) penetrates through the pump chamber cover (14), and a speed change lever (17) is fixed to an outer end thereof.

As shown in FIG. 3, the fork lever (10) is slidably attached to the lever arm (10a) that swings by receiving the governor force (F) and the tip of the lever arm (10a). It is composed of a thrust lever (10b) and the rack pin (9a) of the control rack (9) is clamped by the lever arm (10a) and thrust lever (10b) to enhance the response sensitivity of the governor. There is. The control rack (9) is urged toward the fuel increasing side (R) between the thrust lever (10b) and the pump housing chamber wall (18) located on the fuel increasing side (R) of the control rack (9). Starting spring (19) is engaged. Further, an idle limit spring (20) is arranged on the fuel reducing side (L) of the thrust lever (10b) so that the control rack (9) does not unexpectedly move to the fuel non-injection position.

The engine stop operation lever (21) is pivotally supported together with the speed control lever (15) on the pump chamber lid (14), and the input lever (22) is provided outside the pump chamber wall (14). The output lever (23) is located inside the wall (14). The output end of the output lever (23) of the engine stop operating lever (21) is provided with a pressing piece (25) that can be brought into contact with an engaging projection (24) protruding from the side surface of the thrust lever (10b). )
And a temperature-sensitive operating tool (26) made of bimetal is provided between the pressing piece (25) and the engaging projection piece (24) of the thrust lever (10b). While the engine temperature is low, the temperature-sensitive operating tool (26) is located on the pressing piece (25) side and withdraws from the moving area of the engaging projection (24). It is adapted to be displaced toward the (24) side and advance into the moving area of the engaging projection (24). Therefore, when the temperature of the engine body is low such as when the engine is started, since the temperature-sensitive operating tool (26) is in the retracted posture, the temperature-sensitive operating tool (26) does not come into contact with the engaging projection (24) and the control rack (9) is not moved. It can be moved to the starting increase position without hindrance, but since the machine body temperature is rising during engine operation, the temperature-sensitive operating tool (26) operates and the engaging projection (24)
The operating posture is such that the thrust lever (10b) can be restrained from moving. Then, when the sudden acceleration operation is performed, the thrust lever (10b) tries to move rapidly toward the fuel amount increasing side, but the temperature-sensitive operating tool (26) is in the operating posture, so the thrust lever (10b) is engaged. The temperature-sensitive operating tool (26) receives the protruding piece (24), and restricts the movement toward the fuel increasing side from the maximum fuel injection position.

FIG. 5 and FIG. 6 are plan views of a main part showing a modified example,
The one shown in FIG. 5 uses a shape memory alloy as the temperature-sensitive operating tool (26). In this case, the shape memory alloy changes its posture discontinuously at the transformation temperature. It will be. The one shown in FIG. 6 uses a cylinder in which a thermowax is enclosed as a temperature-sensitive operating tool (26).

FIG. 7 shows another embodiment in which the output lever (23) of the engine stop operation lever (21) is formed of bimetal. The output lever (23) may be made of a shape memory alloy.

FIG. 8 shows still another embodiment, which is a pump chamber lid (14) pivotally supporting an engine stop operating lever (21).
A thermowax-enclosed cylinder is fixed to the inner surface of the engine to form a temperature-sensitive operating tool (26), and the output lever (23) of the engine stop operating lever (21) is adjusted and moved by the temperature-sensitive operating tool (26). Is.

FIGS. 9 to 11 show still another embodiment, and the one shown in FIG. 9 corresponds to the input lever (22) of the engine stop operating lever (21) and is made of a bimetal temperature-sensitive operating tool ( 2
6) is arranged, and the one shown in FIG. 10 is one in which a temperature-sensitive actuating tool (26) made of a shape memory alloy is arranged corresponding to the input lever (22), and FIG. What is shown in (1) is one in which a temperature-sensitive operating tool (26) formed of a thermowax-filled cylinder is arranged corresponding to the input lever (22). With these, when the airframe temperature rises, the engine stop lever (21) is slightly actuated to cause the pressing piece (25) formed at the output end of the output lever (23) to protrude from the side surface of the thrust lever (10b). The engaging protrusion (24) is advanced to the moving region and the engaging protrusion (24) is received at a position corresponding to the maximum fuel injection position of the control rack (9).

In each of the above embodiments, the fork lever (10) is composed of the lever arm (10a) and the thrust lever (10b), but it may be integrally formed.

In the fuel injection amount control device configured as described above, when the speed change lever (17) is rapidly accelerated from the low speed rotation range, the governor spring force (Gs) increases, but the increase in engine speed is delayed a little, so the governor The balance between the force (F) and the governor spring force (Gs) is lost, and the spring lever (12) and the fork lever (10) are moved to the fuel increase side (R). At this time, since the moving speed of the spring lever (12) is rapid, even if the spring lever (12) is received by the fuel limiting pin (25), the accumulated pressure of the torque spring of the torque spring device (13) increases. The fork lever (10) shifts to the fuel increase side, but since the engine temperature rises while the engine is running, the temperature-sensitive operating tool (21) switches to the operating position and the control rack (9) is set to the maximum position. It will be received at the position corresponding to the fuel injection position. As a result, the control rack (9) does not overrun the fuel increase side beyond the maximum fuel injection position, so that the fuel injection amount is limited. Therefore, a limited amount of fuel is supplied to the combustion chamber of the engine, so that excess fuel is prevented and smoke is suppressed.

<Effect> The present invention arranges a temperature-sensitive operating tool that operates by detecting the engine temperature in the engine stop operation system between the input side of the engine stop lever and the control rack, and the engine temperature reaches the set temperature. As a result, the temperature-sensitive operating device operates to restrict the shift of the control rack to the fuel increase side, so the temperature-sensitive operating device will not operate when the engine temperature is above the set temperature. In the operating position, the output side end of the engine stop operating lever projects into the moving region of the stop engaging portion and the stop engaging portion can be received at the position corresponding to the maximum fuel injection position. As a result, even if the accelerator lever is operated to rapidly accelerate the engine, the control rack does not exceed the maximum fuel injection position and overruns to the starting amount increase side, and it is possible to suppress the occurrence of smoke.

On the other hand, since the temperature of the engine is below the set temperature when the engine is started, the temperature-sensitive operating tool is in the standby posture, and the output side end of the engine stop operating lever is retracted from the moving area of the stop engaging part. However, since the movement of the control rack is not restricted, the control rack can be moved to the start-up volume increasing position, and the start-up operation is not hindered.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a perspective view showing a main part taken out, FIG. 2 is a longitudinal sectional view of a fuel injection amount control part, and FIG. 3 is a perspective view showing an interlocking part of a governor lever and a control rack. FIG. 4 is a cross-sectional plan view of the fuel injection amount control section, FIGS. 5 and 6 are main section plan views showing a modified example, and FIG. 7 is an inside view of a pump chamber lid showing another embodiment, FIG. FIG. 7 is a view corresponding to FIG. 7 in still another embodiment, and FIGS. 9 to 11 are external views of pump chamber lids in different embodiments. 3 ... Fuel injection pump, 8 ... Governor lever, 9 ... Control rack, 9a ... (9) input pin, 10 ... Fork lever, 11 ... Governor spring, 12 ... Spring lever, 13 ... Torque Spring device, 14 …… Engine wall (pump chamber cover), 15 …… Speed control lever, 19 …… Start spring, 21 …… Engine stop lever, 23 ……
(21) Output lever, 26 ...... Temperature sensitive device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyoshi Morioka 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd.Sakai Works (72) Yuzo Umeda 64, Ishizukita-machi, Sakai City, Osaka Prefecture Sakai Manufacturing In-house (56) Bibliography Showa 61-108847 (JP, U) Showa 62-61946 (JP, U) Showa 4-17782 (JP, Y2)

Claims (4)

[Claims] 1. A fork lever (10) engaged with a control rack (9) of a fuel injection pump (3) and a spring lever (12) interlockingly connected to a speed control lever (15) via a governor spring (11). ) Together with the governor lever (8), the fork lever (10) and the spring lever (12)
And interlockingly linked via a torque spring device (13),
A diesel engine equipped with a governor device in which the start spring (19) is locked to the fork lever (10) and the control rack (9) can be forcibly moved to the fuel non-injection position by operating the engine stop lever (21). In the engine, a temperature-sensitive operating tool (26) that detects and operates the engine temperature is set in the interlocking operation system from the input side of the engine stop lever (21) to the control rack (9) to set the engine temperature. A smoke reducing device for sudden acceleration of a diesel engine, characterized in that when the temperature is reached, the temperature-sensitive actuating device (26) is actuated to regulate the shift of the control rack (9) to the fuel increase side. 2. An input pin (9) of a control rack (9).
The smoke reduction device for sudden acceleration of a diesel engine according to claim 1, wherein a temperature-sensitive operating tool (26) is arranged between a) and an output side end of the engine stop lever (21). 3. The smoke reducing device for sudden acceleration of a diesel engine according to claim 1, wherein the output lever (23) of the engine stop lever (21) is composed of a temperature-sensitive operating tool (26). 4. The temperature-sensitive operating tool (26) according to claim 1, wherein a temperature-sensitive operating tool (26) is arranged between an engine machine wall (14) pivotally supporting the engine stop lever (21) and the engine stop lever (21). Smoke reduction device during rapid acceleration of diesel engine