JPS5918118Y2 - Reverse rotation prevention device for fuel injection engine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing reverse rotation during starting of a fuel injection engine such as a diesel engine.

Generally, in a fuel injection engine, there is a risk that the engine will be started in a reversed state.

For example, in the case of a hand-started easel engine, if the basic operation at startup is incorrect, the piston will not be able to move past the compression top dead center position, and this reaction will cause the crankshaft to reverse, causing the intake, compression, expansion, and exhaust Each stroke is converted into exhaust, expansion, compression, and suction strokes and then driven.

Therefore, during this reverse operation, engine failures often occur, such as the air cleaner element being damaged by the exhaust gas and seizures occurring because the oil pump does not perform an oil feeding action.

Further, as the engine reverses, the working equipment driven by the engine may be damaged, and there is a risk of personal injury due to reversing, reversing, or reversing the working equipment.

In order to solve the above problem, this invention transmits the reverse rotation of the crankshaft to a stop actuation device consisting of a pump and a fluid pressure actuator operated by the pump, and operates the stop actuation device. This prevents the engine from starting in reverse by cutting off the feed of the engine.

Hereinafter, an embodiment of this invention will be explained based on the drawings. The drawings show a horizontal water-cooled easel engine, and a gear case 3 is disposed in front of a crank case 2 of this engine 1. A timing gear group including a gear 4, a fuel injection cam gear 5, a starting gear 6, an idle gear 7, a balancer gear 8, etc. are meshed in a predetermined state and are driven by the rotation of a crankshaft 9.

Further, a fuel injection pump 10 is mounted on the left side wall of the gear case 3 with one end facing the fuel injection camshaft 11. , a power lever (engine stop device) 14 in order, and also by the speed regulating operation of a centrifugal governor 15 attached to the crank gear 4.

As shown in FIG. 2, the stop actuating device 16 that operates the engine stopping device 14 has a trochoid pump 18 attached to the tip of the rotating shaft 17 of the idle gear 7, a hydraulic actuator 19 attached to the front wall of the gear case 3, and a hydraulic actuator 19 attached to the front wall of the gear case 3. oil pan 20
, oil road 21. It consists of a hydraulic circuit that flows in the order of a hydraulic actuator 19, an oil passage 22, a trochoid pump 18, an oil passage 23, and an oil pan 20, and is a separate circuit from the lubricating oil supply system (not shown) of the engine 1.

The hydraulic actuator 19 consists of a plunger barrel 24 and a plunger 25 that slides inside the plunger barrel 24. The plunger 24 has a governor lever operation rod 26 attached to its tip and an oil passage 2 inside.
A switch oil passage 27 is formed to connect the oil passages 1 and 22, and a check valve 28 is attached to the connecting end of the switch oil passage 27 with the oil passage 22.

Further, 29 and 30 are the suction port 1- and the discharge port of the trochoid pump 18, respectively.

Next, to explain the operation of the above configuration, when the engine 1 is normally started and rotates normally, the inner and outer rotors 31 and 32 of the trochoid pump 18 are rotated by the rotational drive of the crankshaft 9, as shown in FIG. 4A. It rotates in the direction of arrow a via the idle gear shaft 17, and its suction pressure causes the plunger 25 to retreat in the direction of the arrow.

At this time, the oil passage of the stop actuation device 16 forms a closed circuit,
The stop release state in which the plunger 25 is located at the retracted position is maintained.

At this time, the tip operating portion 33 of the governor lever operating rod 26 is located further away from the maximum injection movement position of the governor lever 14.

When the engine 1 rotates in reverse, as shown in FIG. It is inhaled from the discharge port 30 and discharged from the suction port 29.

At this time, the hydraulic oil flowing backward in the direction of arrow d is transferred to the check valve 2.
8 prevents entry into the switch oil passage 27 in the plunger 25, the plunger 25 receives the discharge pressure of the hydraulic oil, moves forward in the direction of arrow e, interrupts the circuit of the stop actuating device 16, and stops. Remains in working condition.

As a result, the tip operating portion 33 of the governor lever operating rod 26
contacts the governor lever 14, forcing the lever 14 to move from the position set by the accelerator lever 12 to the fuel supply stop position.

Therefore, the fuel injection pump 10 is in a non-injection state,
Engine 1 stops.

In the above embodiment, part of the lubricating oil in the oil pan 20 is used as hydraulic oil and is circulated within the circuit of the stop actuating device 16, but the hydraulic oil is prepared separately from the lubricating oil and the stopping actuation It goes without saying that the circuitry of device 16 may be formed independently.

Further, in this case, the working medium of the fluid pressure actuator 19 may be water or air in addition to oil, and it goes without saying that the pump 18 may also be a gear pump or the like in addition to an l-locoid pump. .

Furthermore, in addition to the above-mentioned embodiments, a passage cutoff valve for emergency stop is provided in the intake passage or exhaust passage, and this valve is linked to the plunger 25, and the control rack of the fuel injection pump 10 is directly operated by the operating rod of the plunger 25. It goes without saying that the stop actuating device 16 can be linked to various types of engine stopping devices 14, such as a decompression device linked to the plunger 25 or a decompression device linked to the plunger 25.

Note that the hydraulic actuator 19 is connected to the discharge port 30 of the trochoid pump 18, and when the engine 1 is reversed, the pump 1
The engine stop device 14 may be activated by the suction of 8.

As detailed above, in this invention, the stop actuation device is constructed by connecting a pump and a fluid pressure actuator having a plunger that slides inside the plunger barrel using pump pressure, and the pump is driven by a crankshaft. Therefore, when the engine is reversed, the plunger of the fluid pressure actuator slides due to the reverse pump pressure, switching the engine stop device to the stopped state and cutting off the fuel supply, so the engine is not driven in reverse. I don't get it.

Therefore, it is possible to prevent failure and damage to the engine and the working equipment driven by the engine due to the reversal of the engine, and furthermore, it is possible to prevent personal injury caused by reversing or reversing the working equipment.

In addition, in the present invention, the fluid pressure actuator is composed of a plunger that slides inside the plunger barrel, a rod provided on the plunger, and a check valve attached to the end of the flow path within the plunger. The fluid pressure actuator can be operated even by the action of fluid pressure, and the engine stop device can be reliably operated with high operating sensitivity.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a longitudinal sectional front view of the main parts of a horizontal water-cooled diesel engine, and FIG.
A sectional view taken along line A, Figure 3 is a perspective view taken out of section B in Figure 1, Figure 4
The figure is a schematic perspective view of the main parts showing the operating states of A and B.

Claims (1)

[Scope of utility model registration request] The engine 1 is equipped with an engine stop device 14 and a manual stop operation 16 for actuating the engine stop device 14, and the stop actuator 16 has a fluid pressure actuator 19 connected to at least one of the suction port 29 and the discharge port 30 of the pump 18. The pump 18 is interlocked and connected to the crankshaft 9, and the fluid pressure actuator 19 consists of a plunger barrel 24 and a plunger 25 that slides inside the plunger barrel 24. At the same time, an L-shaped oil passage 27 is formed in the plunger 25, and a check valve 28 is attached to the connecting end of this L-shaped oil passage 27 with the pump 18, and the pump When the pump 18 rotates in the normal direction, oil flows through the oil passage 27 and the engine stop device 14 becomes stopped, and when the pump rotates in the reverse direction, the plunger 25 slides within the plunger barrel 24 under the pump pressure and the rod 26 A reverse rotation prevention device for a fuel injection engine, characterized in that a rod 26 led out from a plunger 25 is interlocked and connected to the engine stop device 14 so that the engine stop device 14 is operated to an engine stop operating state via.