JP2005098179A - Diesel engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diesel engine capable of highly maintaining the accuracy of the regulation amount of a governor. <P>SOLUTION: This diesel engine is formed such that one end part of a start spring 10 is connected to a fuel amount regulating rack 4, the fuel amount regulating rack 4 and an interlocking body 2 are energized with an energizing force 10a of the start spring 10 in a fuel amount increasing direction, the end parts of a pressing spring 11 are connected to the interlocking body 2 and a connection pin 6, and the interlocking body 2 and the connection pin 6 are energized with the energizing force 11a of the pressing spring 11 in an approaching direction. As a result, the connection pin 6 is pressed against the fuel amount reduction side end edge 8 of an elongated hole 7 with the energizing force 10a of the start spring 10 and the energizing force 11a of the pressing spring 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a diesel engine.

The configuration of the diesel engine that constitutes the premise of the present invention is as follows.
That is, as illustrated in FIG. 1, the fuel metering rack (4) of the fuel injection pump (3) is linked to the governor lever (1) via the linkage (2), and the governor lever (1) and the linkage ( 2) At the connecting part (5), the governor lever (1) is provided with a connecting pin (6), and the interlocking body (2) is provided with a long hole (7) along the fuel increasing / decreasing direction of the fuel metering rack (4). A connecting pin (6) is fitted into the long hole (7), and the connecting pin (6) is brought into contact with the end (8) of the fuel reducing side of the long hole (7).
As illustrated in FIG. 2, when the interlocking body (2) is interlocked in the fuel reduction direction by the engine stop operating means (9) at the time of engine stop operation, the long hole (7) along the connecting pin (6) is used. By sliding (7a) in the fuel reduction direction, the fuel metering rack (4) can be interlocked in the fuel reduction direction via the interlocking body (2) while leaving the governor lever (1) left behind. Diesel engine.
In this type of engine, by leaving the governor lever (1) when the engine is stopped, the fuel metering rack (4) can be interlocked in the fuel decreasing direction without receiving the resistance of the governor spring (14). The engine stop operation force can be reduced.

Conventionally, there are diesel engines having such a configuration disclosed in Patent Literature 1 and Patent Literature 2, which are different from the present invention in the following points.
That is, in the engine of Patent Document 1, one end of a starting spring is connected to the interlocking body, and the interlocking body and the fuel metering rack are biased in the fuel increasing direction by the biasing force of the starting spring. The connecting pin is brought into pressure contact with the end of the fuel reduction side of the long hole only by the urging force of the spring.
Further, in the engine of Patent Document 2, each end portion of the pressure contact spring is connected to the rack pin and the connection pin of the fuel metering rack, and the interlocking body and the connection pin are attached in the mutually approaching direction by the biasing force of the pressure contact spring. By urging, the connecting pin is brought into pressure contact with the end of the fuel reduction side of the long hole only by the urging force of the pressure contact spring.

Japanese Patent Laid-Open No. 10-121988 (see FIG. 1) Japanese Utility Model Publication No. 5-64430 (see FIG. 1)

This prior art has the following problems.
<< Problem 1 >> In the engine of Patent Document 1, the metering accuracy of the governor may be lowered.
In the engine of Patent Document 1, since the connecting pin is pressed against the end of the fuel reduction side of the long hole only by the urging force of the starting spring, the pressure of the connecting portion is weak and the metering accuracy of the governor is low. Sometimes.
That is, in recent years, if the injection pressure of the fuel injection pump increases due to high pressure injection, the fuel injection pump may vibrate slightly at the time of high engine rotation. In such a case, in the engine of Patent Document 1, since the pressure of the connecting portion is weak, the connecting portion repeats close contact and separation due to slight vibration of the fuel injection pump, and the movement of the governor lever is accurately transmitted to the interlocking body. In other words, the metering accuracy of the governor may be lowered.

<< Problem 2 >> In the engine of Patent Document 1, engine stall may occur due to a rapid decrease in load.
In the engine of Patent Document 1, since the pressure contact force of the connecting portion is weak, engine stall may occur due to a rapid decrease in load.
That is, when the engine speed increases rapidly due to a rapid decrease in load and the governor force increases rapidly, the interlocking body and the fuel metering rack are linked in the fuel decreasing direction at high speed following the swing of the governor lever in the fuel decreasing direction. Is done. In such a case, in the invention of Patent Document 1, since the pressure of the connecting portion is weak, even if the swing of the governor lever is stopped, the interlocking body and the fuel metering rack are overloaded in the fuel reduction direction by the inertial force. Shoot and cause engine stalls.

<< Problem 3 >> With the engine of Patent Document 1, noise during idling may increase.
If the urging force of the starting spring is increased in order to solve the above problems 1 and 2, the fuel injection amount during the idling operation becomes excessive. In such a case, the idle rotation speed increases and the noise increases.

<< Problem 4 >> With the engine of Patent Document 2, the engine cannot be started smoothly.
Since the engine of Patent Document 2 does not include a starting spring, the starting amount cannot be increased and the engine cannot be started smoothly.

<< Problem 5 >> In the engine of Patent Document 2, it is difficult to add a starting spring.
In the engine of Patent Document 2, since each end of the pressure contact spring is connected to the rack pin and the connection pin of the fuel metering rack, the pressure contact spring becomes longer. It is difficult to add.

  An object of the present invention is to provide a diesel engine that can solve the above-described problems, that is, a diesel engine that can maintain a high metering accuracy of the governor.

(Invention of Claim 1)
The main invention specific items of the invention of claim 1 are as follows.
That is, as illustrated in FIG. 1, one end of a start spring (10) is connected to the fuel metering rack (4), and the fuel metering rack (4a) is biased by the biasing force (10a) of the start spring (10). 4) and the interlocking body (2) are urged in the fuel increasing direction, and the end portions of the pressure contact spring (11) are connected to the interlocking body (2) and the connecting pin (6), respectively. By energizing the interlocking body (2) and the connecting pin (6) in the mutually approaching direction with the urging force (11a) of (11), the urging force (10a) of the starting spring (10) and the pressure contact spring ( A diesel engine characterized in that the connecting pin (6) is brought into pressure contact with the fuel loss side end edge (8) of the long hole (7) with the urging force (11a) of 11).

(Invention of Claim 2)
The main invention-specific matters of the invention of claim 2 are as follows.
As illustrated in FIG. 3, the coil portion (10b) of the start spring (10) and the coil portion (11b) of the press contact spring (11) are arranged in series in the fuel increasing / decreasing direction beside the interlocking body (2). A diesel engine characterized by being arranged side by side.

(Invention of Claim 3)
The main specific features of the invention of claim 3 are as follows.
As illustrated in FIG. 5, when the engine is stopped, the interlocking body narrow portion (13) between the thinning hole (12) and the long hole (7) is the outer periphery of the coil portion (11 b) of the pressing spring (11). Diesel engine characterized by passing through the side of

(Invention of Claim 1)
The invention of claim 1 has the following effects.
<Effect 1> The metering accuracy of the governor can be kept high.
As illustrated in FIG. 1, the connecting pin (6) is fuel-reduced in the long hole (7) by the urging force (10a) of the starting spring (10) and the urging force (11a) of the pressing spring (11). Since it is press-contacted to the side edge (8), the press-contact force of this connection part (5) is strong, and the metering precision of a governor can be maintained highly.
That is, in recent years, if the injection pressure of the fuel injection pump (3) increases due to high pressure injection, the fuel injection pump (3) may slightly vibrate during high engine rotation. In such a case, in the present invention, since the press contact force of the connecting portion (5) is strong, the connecting portion (5) is difficult to be separated and the close contact state is maintained, and the governor lever (1) moves in the interlocking body (2). The metering accuracy of the governor can be kept high.

<< Effect 2 >> Engine stall due to a rapid decrease in load is unlikely to occur.
As illustrated in FIG. 1, since the pressure contact force of the connecting portion (5) is strong, engine stall due to a rapid decrease in load is unlikely to occur.
That is, when the engine speed rapidly increases and the governor force (15) increases rapidly due to a rapid decrease in load, the interlocking body (2) and the fuel metering rack follow the swing of the governor lever (1) in the fuel decreasing direction. (4) is linked to the direction of fuel loss at high speed. In such a case, in the present invention, since the pressure of the connecting portion (5) is strong, when the swing of the governor lever (1) is stopped, the interlocking body (2) and the fuel metering rack (3) are also connected to the governor lever (1 ), And the overshoot in the fuel reduction direction is suppressed, and the engine stall hardly occurs.

<Effect 3> Noise during idling can be kept small.
As illustrated in FIG. 1, since the connecting portion 5 is pressed by the urging force 10 a of the starting spring 10 and the urging force 11 a of the pressing spring 11, the starting spring is used. There is no need to increase the urging force (10a) of (10). For this reason, the fuel injection amount during the idling operation does not become excessive, and the idling rotation speed can be lowered and the noise can be kept small.

<Effect 4> The engine can be started smoothly.
As illustrated in FIG. 1, since the starting spring (10) is provided, the starting amount can be increased and the engine can be started smoothly.

<Effect 5> The starting spring can be easily arranged.
As illustrated in FIG. 1, since the end portions of the pressure contact spring (11) are connected to the interlocking body (2) and the connection pin (6), the pressure contact spring (11) can be shortened. The starting spring (10) can be easily arranged.

(Invention of Claim 2)
<< Effect 6 >> The starting spring and the pressure contact spring can be arranged compactly.
As illustrated in FIG. 3, the coil portion (10b) of the start spring (10) and the coil portion (11b) of the press contact spring (11) are arranged in series in the fuel increasing / decreasing direction beside the interlocking body (2). Therefore, the starting spring (10) and the pressure contact spring (11) can be arranged in a compact manner.

(Invention of Claim 3)
<< Effect 7 >> The metering accuracy of the governor can be maintained high.
As shown in FIG. 5, the interlocking body (2) is provided with the thickness removing hole (12), so that part or all of the increased weight due to the addition of the pressure contact spring (11) can be offset, and the governor is adjusted. High quantity accuracy can be maintained.

<< Effect 8 >> The engine stop operation can be performed smoothly.
As illustrated in FIG. 5, when the engine is stopped, the interlocking body narrow portion (13) between the thinning hole (12) and the long hole (7) is the outer periphery of the coil portion (11 b) of the pressing spring (11). Since the interlocking body (2) is in contact with the coil portion (11b) of the pressure contact spring (11), the interlocking body (2) is the coil portion (11b) of the pressure contact spring (11). The sliding resistance received from the engine can be small due to the narrow portion (13) of the interlocking body, and the engine stop operation can be performed smoothly.

Embodiments of the present invention will be described with reference to the drawings.
1-5 is a figure explaining the diesel engine which concerns on embodiment of this invention, and this embodiment demonstrates using a vertical multicylinder diesel engine.

The outline of this engine is as follows.
As shown in FIG. 4, a fuel supply device is disposed beside the cylinder block (not shown). The configuration of the fuel supply device is as follows. The fuel injection pump (3) is stored in the pump storage case (16), and the fuel injection camshaft (17) is installed in the lower part of the pump storage case (16). The fuel injection pump (3) is a row type pump and includes a fuel metering rack (4). A governor accommodating case (18) is arranged at the rear of the pump accommodating case (16), and a mechanical governor (19) is accommodated in the governor accommodating case (18).

The configuration of the mechanical governor (19) is as follows.
As shown in FIG. 1, the governor lever (1) is of a two-lever type and comprises a spring force input lever (20) and a governor force input lever (21). Each lever (20) (21) is pivotally supported by a governor lever pivot (22). The spring force input lever (20) is linked to the governing lever (23) via a governor spring (14). The governor force input lever (21) has its input portion facing the governor force generating means (24), and a connecting pin (6) is provided at its output portion.

The configuration of the governor force generating means (24) is as follows.
As shown in FIG. 4, a weight holder (25) is attached to the fuel injection camshaft (17), a flyweight (26) is attached to the weight holder (25) so as to be swingable, and an end of the fuel injection camshaft (17) is attached. The guide shaft (27) protrudes into the governor housing case (18) from the portion, and the governor sleeve (28) is slidably fitted onto the guide shaft (27), and the flyback is input to the input end surface of the governor sleeve (28). The output portion of the weight (26) is brought into contact with the output end surface of the governor sleeve (28) and brought into contact with the input portion of the governor force input lever (21).

The mutual arrangement of the governor lever (1) is as follows.
As shown in FIG. 3, the governor force input lever (21) faces the spring force input lever (20) from the fuel increase side. The spring force input lever (20) is provided with a torque increase device (29). As shown in FIG. 1, the torque-up device (29) supports the torque pin (31) and the torque spring (32) on the torque holder (30), and the torque pin ( 31) is urged in a direction protruding from the tip surface of the torque holder (30), and the tip of the torque pin (31) is brought into contact with the governor force input lever (21). The spring force input lever (20) faces the fuel limiter (33) from the fuel increase side.

The interlocking structure between the mechanical governor (19) and the fuel metering rack (4) is as follows.
As shown in FIG. 3, the fuel metering rack (4) of the fuel injection pump (3) is linked to the governor force input lever (21) via the linkage (2). As shown in FIG. 1, a connecting pin (6) is provided on the governor force input lever (21) at the connecting portion (5) between the governor force input lever (21) and the connecting body (2), and the interlocking body (2 ) Is provided with a long hole (7) along the fuel increasing / decreasing direction of the fuel metering rack (4), and a connecting pin (6) is fitted into the long hole (7). ) Is brought into contact with the fuel reduction side edge (8).

The function of the mechanical governor (19) during engine operation is as follows.
As shown in FIG. 1, when the speed control lever (23) is set to the high speed position, the governor spring is kept pressed with the torque pin (31) being pushed into the torque holder (30) during partial load operation from no load to the rated load. The governor lever (1) swings integrally with the unbalanced force between the spring force (14a) and the governor force (15). Following the swing of the governor lever (1), the interlocking body (2) and the fuel metering rack (4) are interlocked in the fuel increasing / decreasing direction. At the rated load, the spring force input lever (20) is received by the fuel limiter (33) and the fuel is limited. During overload operation exceeding the rated load, the spring force input lever (20) is received by the fuel limiter (33) and the governor force (15) and the spring force (32a) of the torque spring (32) are not With the balance force, only the governor force input lever (21) swings while the torque pin (31) advances and retreats, and the interlocking body (2) and the fuel metering rack (4) are within the fuel limit. It is linked to the increase / decrease direction to suppress engine stall.

The function of the mechanical governor (19) at the time of engine stop operation is as follows.
As shown in FIG. 2, during engine stop operation, the engine stop operating means (9) operates the interlocking body (2) in the direction of fuel reduction, and the long hole (7) is fuel reduced along the connecting pin (6). By sliding (7a) in the direction, the fuel metering rack (4) is interlocked in the fuel decreasing direction via the interlocking body (2) while leaving the governor lever (1) left behind. The engine stop operating means (9) makes the output part of the solenoid (35) contact the input part of the swing arm (34), and the input part of the interlocking body (2) to the output part of the swing arm (34). The output part of the solenoid (35) protrudes, the swing arm (34) is swung, and the interlocking body (2) is pushed in the fuel decreasing direction by the output part of the swing arm (34). ing. When the output portion of the solenoid (9) is pulled, the swing arm (34) is returned to its original position by the return spring (36). When starting the engine, the fuel metering rack (4) is positioned at the start increasing position by the spring force (10a) of the start spring (10).

The pressure contact structure of the connecting portion (5) between the governor lever (1) and the interlocking body (2) is as follows.
As shown in FIG. 1, one end of a starting spring (10) is connected to a rack pin (37) of a fuel metering rack (4), and a spring engaging portion is connected to a chamber wall (18a) of a governor housing case (18). (38) is provided, and the other end portion of the starting spring (10) is engaged with the spring engaging portion (38), and the fuel metering rack (4) is applied by the urging force (10a) of the starting spring (10). ) And the interlocking body (2) are urged in the direction of fuel increase. Each end of the pressure contact spring (11) is connected to the interlocking body (2) and the connection pin (6), and the interlocking body (2) and the connection pin are connected by the biasing force (11a) of the pressure contact spring (11). (6) is urged toward each other. As a result, the connecting pin (6) is connected to the fuel reduction side edge (8) of the long hole (7) by the biasing force (10a) of the starting spring (10) and the biasing force (11a) of the pressure spring (11). ).

The arrangement of the starting spring (10) and the pressure contact spring (11) is as follows.
As shown in FIG. 3, the coil portion (10b) of the starting spring (10) and the coil portion (11b) of the pressure contact spring (11) are arranged in series in the fuel increasing / decreasing direction beside the interlocking body (2). They are arranged side by side. A wall removal hole (12) is provided in the interlocking body (2). As shown in FIG. 5 (A), the outer periphery of the coil portion (11b) of the pressure contact spring (11) faces the removal hole (12) during engine operation. As shown in FIG. 5 (B), after the engine stop operation, the outer periphery of the coil portion (11b) of the pressure contact spring (11) faces the removal hole (12) and the long hole (7). During the stop operation, the interlocking body narrowing portion (13) between the wall removal hole (12) and the long hole (7) passes through the outer periphery of the coil portion (11b) of the pressure contact spring (11).

It is a mimetic diagram explaining a function of a mechanical governor at the time of engine operation concerning an embodiment of the present invention. It is a mimetic diagram explaining a function of a mechanical governor at the time of engine stop operation concerning an embodiment of the present invention. It is a cross-sectional plan view of the principal part of the engine of FIG. It is a vertical side view of the principal part of the engine of FIG. FIGS. 5A and 5B are views for explaining the positional relationship between the interlocking body narrowing portion and the coil portion of the pressure contact spring when the interlocking body of the engine of FIG. 1 is moved, FIG. 5A is during engine operation, and FIG. This is after the stop operation. (1) ... cabana lever, (2) ... interlocking body, (3) ... fuel injection pump, (4) ... fuel metering rack, (5) ... connecting part, (6) ... connecting pin, (7) ... long hole , (8) ... Fuel reduction side edge, (9) Engine stop operating means, (10) ... Starting spring, (10a) ... Biasing force, (10c) ... Coil portion, (11) ... Pressure contact spring, (11a): Energizing force, (11b): Coil portion, (12): Wall removal hole, (13): Narrow portion of interlocking body.

Claims (3)

The fuel metering rack (4) of the fuel injection pump (3) is linked to the governor lever (1) via the interlocking body (2), and the connecting portion (5) between the governor lever (1) and the interlocking body (2) is connected. The governor lever (1) is provided with a connecting pin (6), and the interlocking body (2) is provided with a long hole (7) along the fuel increasing / decreasing direction of the fuel metering rack (4) and connected to the long hole (7). The pin (6) is fitted inside, and the connecting pin (6) is brought into contact with the fuel reducing side edge (8) of the long hole (7).
When the interlocking body (2) is interlocked and operated in the fuel decreasing direction by the engine stop operating means (9) during the engine stopping operation, the long hole (7) is slid along the connecting pin (6) in the fuel decreasing direction (7a In the diesel engine, in which the fuel metering rack (4) can be interlocked in the fuel decreasing direction via the interlocking body (2) with the governor lever (1) left behind.
One end of the starting spring (10) is connected to the fuel metering rack (4), and the biasing force (10a) of the starting spring (10) connects the fuel metering rack (4) and the interlocking body (2). Energizing in the fuel increasing direction, each end of the pressure spring (11) is connected to the interlocking body (2) and the connecting pin (6), respectively, and the biasing force (11a) of the pressure spring (11) is connected. By urging the interlocking body (2) and the connecting pin (6) in the mutually approaching direction, the urging force (10a) of the starting spring (10) and the urging force (11a) of the pressing spring (11) are obtained. The diesel engine characterized in that the connecting pin (6) is brought into pressure contact with the end (8) of the long hole (7) on the fuel reduction side. The diesel engine according to claim 1,
The coil portion (10b) of the start spring (10) and the coil portion (11b) of the pressure contact spring (11) are arranged in series in the fuel increasing / decreasing direction on the side of the interlocking body (2). Diesel engine. In the diesel engine according to claim 1 or 2,
A thinning hole (12) is provided in the interlocking body (2), and the outer periphery of the coil portion (11b) of the pressure contact spring (11) faces the thickness removal hole (12) while the engine is running. The outer periphery of the coil portion (11b) of the spring (11) faces the thinning hole (12) and the long hole (7), so that when the engine is stopped, the thinning hole (12) and the long hole (7) A diesel engine characterized in that the narrowed portion (13) of the interlocking body passes between the outer periphery of the coil portion (11b) of the spring for pressure contact (11).

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