JPS6318788Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides benefits by cutting off the supply of fuel to some cylinders of a multi-cylinder engine, such as one bank of cylinders in a V-type engine, and using that cylinder as an air compressor. The present invention relates to an improvement in a vehicle equipped with an engine capable of delivering compressed air, which can use compressed air for various tasks.

2. Description of the Related Art Conventionally, work vehicles that use compressed air as a driving source to perform various tasks have used an engine to drive a compressor, and the compressed air obtained by the compressor is stored in an air tank or the like to perform the task.

However, in recent years, some cylinders of multi-cylinder engines,
For example, a compressed air system that allows the engine to function as an air compressor by cutting off the fuel supply to five cylinders on one side of a V-type 10-cylinder engine and driving these cylinders with the remaining movable cylinders. Vehicles equipped with engines that can be delivered are in the practical stage. Such a vehicle is very effective when used as a powder transport vehicle, for example.

FIG. 1 is an explanatory diagram of the configuration of a compressed air delivery mechanism of a vehicle equipped with an engine capable of delivering compressed air as described above.

The engine 1 shown in FIG. 1 is a V-type 10-cylinder diesel engine, and a fuel injection pump 2 for the right bank is installed between the right bank 1A and the left bank 1B.
A and a left bank fuel injection pump 2B are installed. 3 is a fuel filter, and the fuel sent from the fuel tank 4 by a fuel delivery device (not shown) passes through the fuel filter 3 and is supplied from the fuel passage 5 to the fuel injection pumps 2A, 2B. . 6A is an exhaust pipe of the right bank 1A, and 6B is an exhaust pipe of the left bank 1B.These are collected into one exhaust pipe 6, which opens to the atmosphere through a silencer (not shown) or the like.

In the engine 1 shown in FIG. 1, the left bank 1B can be used as an air compressor, and the fuel injection pump 2B for the left bank has a fuel inlet and a surplus fuel outlet, respectively. Fuel cutoff valves 7A and 7B as fuel stop means
is installed, and the compressed air extraction means operation circuit M
When the fuel cutoff switch 8 inside is turned on, the fuel passage 5
It has become possible to block out A sliding exhaust brake 30 is provided on the exhaust pipe 6B of the left bank 1B, and a compressed air extraction pipe 16 is connected to the upstream side of the exhaust pipe 6B via a pipe switching valve 20. An air filter 15 is provided in the middle of this compressed air outlet pipe 16.

Further, the switching valve 20 and the exhaust brake 3
0 is compressor 13A installed in the vehicle
When the electromagnetic cutoff valves 11A and 11B are opened after the pressure feed switch 9 in the operating circuit M is turned on, high pressure air is supplied from the air tank 13 to the air passages 14A and 14.
B respectively to the switching valve 20 and the exhaust brake 3.
0. As a result, the exhaust brake 30 shuts off the exhaust pipe 6B, and the switching valve 20 connects the compressed air extraction pipe 16 to the exhaust manifold of the left bank 1B. 10 is an engine switch, and 18 is a battery.

Note that an exhaust brake 17 is also provided on the exhaust pipe 6A side of the right bank 1A, and the exhaust brake 17 is provided on the exhaust pipe 6A side of the right bank 1A.
An exhaust brake switch (not shown) is operated together with the side exhaust brake 30 when the engine 1 is operating on all cylinders, but this will not be explained here.

FIG. 2 shows the switching valve 20 and the exhaust brake 3.
This shows the specific structure of 0. Switching valve 20
is provided between the branch pipe 19 provided in the exhaust pipe 6B on the upstream side of the exhaust brake 30 and the compressed air extraction pipe 16, and the air introduction part 26A of the casing 26 is connected to the branch pipe 19. , an air delivery section 26B is connected to the compressed air extraction pipe 16. Further, inside the casing 26 is a cylinder 21 into which high pressure air from the air tank 13 is introduced.
A piston 22 is slidably fitted into the cylinder 21. A valve stem 23 having a valve body 24 at its tip is protruded from this piston 22, and when the valve body 24 is fitted into and removed from a valve seat 27 fixed in the air introduction portion 26A, The compressed air take-off pipe 16 and the exhaust pipe 6B are cut off or communicated with each other. A spring 25 biases the piston 22 in a direction to fit the valve body 24 into the valve seat 27, and contracts when high pressure air is introduced into the cylinder 21 to open the switching valve 20.

On the other hand, the exhaust brake valve 30 includes a cylinder 31 inside a casing 36, a piston 32 sliding inside the cylinder 31, a valve stem 33 protruding from the piston 32, a valve body 34 attached to the tip thereof, It is composed of a spring 35 that biases the piston 32 in a direction in which the body 34 is housed in a valve body housing pipe 37 provided in the exhaust pipe 6B. When high-pressure air is fed into the cylinder 31, the piston 32 moves against the spring 35, and the valve body 34 protrudes from the valve body storage pipe 37 into the exhaust pipe 6B to block it.

Therefore, when the electromagnetic cutoff valves 11A and 11B open, high-pressure air flows from the air tank 13 through the air passages 14 and 14A to the cylinder 31 of the exhaust brake 30.
Similarly, high pressure air is supplied into the cylinder 21 of the switching valve 20 through the air passages 14 and 14B. As a result, the exhaust pipe 6B is blocked and the compressed air take-off pipe 16 is connected to the exhaust brake 30 of the exhaust pipe 6B.
The compressed air A produced by the left bank 1B flows in the direction of the arrow and is taken out from the compressed air take-out pipe 16.

Generally, the fuel cutoff switch 8 is provided in the driver's cabin of the vehicle, and the pressure feed switch 9 is turned on when a working lever outside the vehicle is turned on. When the pressure feed switch 9 is turned on, the electromagnetic cutoff valves 11A and 11B are actuated, and a means for increasing the rotation of the engine connected thereto to a set rotation sufficient for air pressure feed, such as a controller 1, is used.
2 and actuator 12A (FIG. 1), the rotation of the engine 1 is increased from an idle rotation to a set rotation sufficient for air pressure feeding of about 2000 rpm.

By the way, even if the fuel cutoff switch 8 is turned on to cut off the fuel to the fuel injection pump 2B, some fuel remains in the fuel gear of the injection pump 2B, and this residual fuel is injected from the nozzle. If this is not done, left bank 1B cannot truly become an air compressor.

Therefore, in conventional vehicles equipped with engines capable of delivering compressed air, consideration must be given to the time it takes for the driver to leave the cab and reach the work lever, and the fact that the engine speed increases when the pressure feed switch 9 is turned on. , activated by turning on the fuel cutoff switch 8,
A timer device 40 having a delay time of about 1.5 to 3 minutes is connected to the pressure feed switch 9 and the electromagnetic cutoff valve 11A.
11B. This timer device 40
Therefore, even if the pressure feed switch 9 is turned on after the fuel cutoff switch 8 is turned on, the electromagnetic cutoff valves 11A, 11
The valve B does not open immediately, but only after the fuel in the fuel injection pump 2B is completely exhausted and the left bank 1B starts to operate as an air compressor.

However, in a conventional vehicle equipped with an engine capable of delivering compressed air configured as described above, if for some reason the driver turns on the pressure feeding switch 9 immediately before or after the time when the delay time set in the timer device 40 ends, After the fuel cutoff switch 8 is turned on, the engine 1 is operating at idle speed with low fuel consumption, and the fuel injection pump 2 is turned on.
The fuel in B may not be exhausted. Then,
Immediately after turning on the pressure feed switch 9, the switching valve 20 opens, and exhaust gas flows into the compressed air outlet pipe 16. As a result, there are problems in that the air filter 15 quickly becomes clogged and exhaust gas is mixed into the extracted air, causing trouble in the work.

The purpose of the present invention is to eliminate the drawbacks of the conventional engines capable of delivering compressed air, and to provide a vehicle equipped with an excellent engine capable of delivering compressed air, in which there is no risk of exhaust gas being mixed into compressed air for work. That's true.

For the above purpose, in the present invention, in the compressed air take-out operation circuit, a rotation detection switch that closes when the engine rotation reaches a set rotation sufficient for pumping air is installed between the pressure feed switch and the electromagnetic cutoff valve, and the compressed air is sent out. is characterized in that it is started when the engine speed increases to a set speed sufficient for air pumping.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a configuration explanatory diagram showing the compressed air delivery mechanism of a vehicle equipped with an engine capable of delivering compressed air according to the present invention, and the same parts as the conventional parts shown in FIGS. 1 and 2 are given the same numbers. .

In the present invention, the fuel cutoff switch 8 provided in the driver's cab of a vehicle equipped with an engine capable of delivering compressed air is not provided with a timer device that operates in conjunction with the fuel cutoff switch 8. Instead, a rotation detection switch 50 is connected after the pressure feed switch 9, which is turned on and off in conjunction with a work lever outside the vehicle, to close when the engine rotation reaches a set rotation sufficient for air pressure feed. The rotation detection switch 50 is installed between the pressure feed switch 9 and the electromagnetic cutoff valve 11A, as shown in FIG.

The rotation detection switch 50 detects the rotation of the engine 1, for example, the rotation of the crankshaft K, by a rotation sensor 52.
When the detected rotation is input to the controller 12 and reaches the set rotation speed, the controller 12 outputs an output to operate the actuator 51 and close the rotation detection switch 50.

After the pressure feed switch 9 is turned on, the controller 12 and actuator 12A are turned on as described above.
increases the rotational speed of the engine 1 to a rotational speed sufficient for pumping, so if the engine rotational speed increases from the idle state to the set rotational speed, the residual fuel in the fuel injection pump 2B will be completely drained within this time. It is sprayed from the nozzle and runs out.

Therefore, with the device of the present invention, there is no possibility that exhaust gas will be mixed into the air when compressed air is taken out.

As explained above, in a vehicle equipped with an engine capable of delivering compressed air according to the present invention, when using compressed air, turn on the fuel cutoff switch in the driver's cab, then tilt the work lever and turn on the pressure feed switch to exhaust the air after a predetermined time. Since the compressed air can be taken out from a clean compressed air take-off pipe that does not contain gas and used for work, the life of the air filter installed in the compressed air take-off pipe is extended, and work can be done without worrying about contamination with exhaust gas. This has the effect of allowing work to be carried out smoothly without failure.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the configuration of a compressed air delivery mechanism of a conventional vehicle equipped with an engine capable of delivering compressed air, Figure 2 is a sectional view showing the specific structure of the switching valve and exhaust brake shown in Figure 1, and Figure 3 is FIG. 2 is a diagram illustrating the configuration of a compressed air delivery mechanism of a vehicle equipped with an engine capable of delivering compressed air according to the present invention. 1...Engine, 1B...Left bank, 2A,
2B...Fuel injection pump, 3...Fuel filter,
6A, 6B...Exhaust pipe, 7A, 7B...Fuel cutoff valve, 8...Fuel cutoff switch, 9...Pressure switch, 11A, 11B...Solenoid cutoff valve, 12...Controller, 12A...Actuator, 13 …
...Air tank, 15...Air filter, 16...
Exhaust brake, 50... Roll detection switch, 51...
...actuator, 52...rotation sensor.

Claims (1)

[Scope of utility model registration request] Some of the cylinders are configured as fuel supply stoppable cylinders having a fuel stop means in the fuel supply system, and a compressed air outlet pipe is connected to the exhaust pipe of the cylinder via a switching valve, and the fuel stop means and the switching In a vehicle equipped with an engine capable of delivering compressed air, which is equipped with a compressed air extraction operation circuit that operates a valve, a fuel cutoff switch that operates the fuel stop means during the compressed air extraction operation circuit, and a set rotation of the engine that is sufficient for air pressure feeding. A pressure feed switch is provided which operates a means capable of increasing the speed of the compressed air to A vehicle equipped with an engine capable of delivering compressed air, characterized in that the compressed air starts flowing into the compressed air take-out pipe when the engine rotation increases to a set rotation sufficient for air pressure feeding.