JPS5872639A - Internal-combustion engine - Google Patents

Abstract

PURPOSE:To improve a brake effect in engine brake operation through an exhaust brake device, by opening an inertia intake control valve at high speed operation and closing said valve at low speed operation. CONSTITUTION:An internal combustion engine 10 is equipped with an exhaust manifold 11, connected to an exhaust port of a cylinder head 19, divided type intake manifold 12, connected to an intake port of the cylinder head 19 and partitioned by a separator wall 18, branch type intake pipe 13, connecting each of the divided type intake manifold 12 in both sides of the separator wall 18 to an air cleaner side, bypass passage 14, mutually connecting each of the branch type intake pipe 13 at a side of said divided type intake manifold 12, exhaust butterfly valve 15, noise suppressor 16 and inertia intake control valve 17. Then the inertia intake control valve 17 is provided in the bypass passage 14, and opened at high speed operation while closed at low speed operation.

Description

[Detailed description of the invention] The present invention relates to internal combustion engines used in automobiles.

In recent years, exhaust brake devices have been installed on automobiles, especially large trucks, in order to improve the braking force of the engine brake.

When the accelerator pedal is released, the exhaust brake device closes the exhaust manifold side of the internal combustion engine mounted on the large truck using a butterfly valve, etc., and causes the internal combustion engine to act as a compressor.・It increases the braking force of the brake pedal, and furthermore,
In some cases, a noise suppressor is attached to the intake manifold side of the internal combustion engine to attenuate blowback noise when the exhaust brake device is operated.

However, this type of exhaust brake device
Although the braking force as a brake is improved to some extent,
In the case of large trucks with extremely large payloads, sufficient braking force cannot be obtained from the engine brake, and therefore, there is a tendency for service brakes to be used in conjunction with the engine brake to compensate for the lack of braking provided by the engine brake. there were.

The purpose of this invention is to
An object of the present invention is to provide an internal combustion engine that improves the braking effect of a brake, can be used even in automobiles with extremely heavy loads such as large trucks, and has a simple structure.

To this end, the internal combustion engine of the present invention includes an exhaust manifold connected to the exhaust port of the Schilling head, a split intake manifold connected to the intake port of the cylinder head, and air between each of the split intake manifolds.・A branched intake pipe that connects to the cleaner side, a pipe passage that connects each of the branched intake pipes to each other on the split intake manifold side, and an exhaust butterfly provided on the exhaust manifold side. With pulp.

and an inertial intake control pulp provided in the piping passage so as to open and close the bypass passage. Hereinafter, preferred specific examples of the internal combustion engine according to the present invention will be described with reference to the drawings. .

The figure schematically shows a tenth embodiment of the internal combustion engine of the invention applied to a large truck.

The internal combustion engine 10 includes an exhaust manifold 11 connected to an exhaust port of a cylinder head 19, a split intake manifold 12 connected to an intake port of the cylinder head 19 and partitioned by a partition wall 18, and the partition wall. A branched intake pipe 13 connects each of the split intake manifolds 12 on both sides of the 18 and an air cleaner (not shown) side, and a branched intake pipe 13 connects each of the split intake manifolds 12 on the split intake manifold 12 side. a bypass passage 14 connected to each other; an exhaust butterfly pulp 15 rotatably provided on the exhaust manifold side;
A noise saggressor 16 is rotatably provided on the air cleaner side of the branched intake pipe 13, and an inertial intake control valve 17 is rotatably provided in the bypass passage 14 to open and close the bypass passage 14. It is equipped with

The exhaust manifold 11 connects a plurality of exhaust ports of the cylinder head 19 and an exhaust pipe (not shown) connected to a muffler (not shown) side, and a plurality of branch pipes are connected to the cylinder head 19. Each bolt is tightened to match the exhaust port of the head 19.

The exhaust manifold 11 is configured similarly to an exhaust manifold in an existing internal combustion engine, so a description of its configuration will be omitted.

The split-type intake manifold 12 is constructed almost in the same way as the intake manifold 12 in an existing internal combustion engine, but the inside part is partitioned by a partition wall 18 at approximately 3 degrees, that is, the internal combustion engine shown in the figure. Since this is a 6-cylinder type, by integrally forming the partition wall 18 at the center of the inside, the split-type intake manifold 1
2 are partitioned to be used as intake manifolds for three cylinders on each side.

Of course, the plurality of branch pipe sides of the divided intake manifold 12 are each bolted to match the intake ports of the cylinder head 19.

In addition, each of the divided intake manifolds 12 includes
A branched intake pipe 13 is attached as shown in the figure.

The branched intake pipe 13 is connected to the split intake manifold 1.
Of course, it is also possible to integrally form the divided intake manifold 12 so that the branched intake pipe 13 is connected to each of the ENER cleaners. be done.

Each of the divided intake manifolds 12 is connected to each other by the branched intake pipe 13, and the air
The cleaner has been contacted.

Further, the portion of the branched intake pipe 13 on the side of the divided intake manifold 12, ζ, that is, the branched portions 20 and 21 are connected to each other by a bypass passage 14.

Therefore, the bypass passage 14 is connected to the branched intake pipe 1.
The connecting flow passages of the divided intake manifold 12 in No. 3 are shortened.

In addition, the above-mentioned exhaust manifold 11 includes an exhaust butterfly/? for the exhaust brake. A pulp 5 is rotatably mounted.

The exhaust butterfly valve 15 is driven by a hydraulic or pneumatic cylinder (not shown), and a lever (not shown) is attached to the shaft of the exhaust butterfly valve 15, and the exhaust butterfly valve 15 is driven by a hydraulic or pneumatic cylinder (not shown). Alternatively, the tip of the operating rod in the pneumatic cylinder is connected to the lever.

Of course, the exhaust butterfly fist pulp 15,
It is configured to be closed when pressure on an accelerator pedal (not shown) in a large truck is released.

Further, in the above-mentioned branched intake pipe 13, a noise suppressor 16 is rotatably attached to a position on the air cleaner side.

Since the noise suppressor 16 is constructed in substantially the same manner as the exhaust butterfly valve 15 described above, a description of its construction will be omitted.

Of course, the noise suppressor 16 is configured to be driven in conjunction with the exhaust butterfly valve 15.

Further, an inertial intake control valve 17 is rotatably attached to the bypass passage 14 in the branched intake pipe 13.

That is, the inertial intake control valve 17 is
47 passage 14, and is driven by a hydraulic or pneumatic cylinder (not shown) similarly to the exhaust butterfly valve 15 described above.

Therefore, on the shaft of the inertial intake control valve 17,
A lever (not shown) is attached to which the tip of the operating rod on the hydraulic or pneumatic cylinder is pin-coupled.

The inertial intake control valve 17 is opened and closed depending on the traveling speed of the large truck.

In other words, the inertial intake control valve 17 is configured to be opened during high-speed operation and closed during low-speed operation.

Therefore, the hydraulic or pneumatic cylinder for the inertial intake control valve 17 is connected to an oil pump (not shown) or an air tank (not shown), and the piping connecting them is equipped with a solenoid valve. (not shown) is provided,
The solenoid valve is connected to a vehicle speed sensor (not shown).

In the internal combustion engine 10 according to the present invention, the configurations other than those described above are configured in the same manner as existing internal combustion engines, so the description of those configurations will be omitted.

Next, to describe the braking as an exhaust brake in the internal combustion engine 10 according to the present invention, first, when the exhaust brake switch (not shown) is energized while driving in a large trunk, the pressure on the accelerator/K-dial is When the exhaust butterfly valve 15 and the noise suppressor 16 are released, the exhaust butterfly valve 15 and the noise suppressor 16 are closed almost simultaneously.

When the exhaust butterfly valve 15 is closed, the internal combustion engine 10 acts as a compressor and the engine
The braking force as a brake is improved.

Of course, by closing the noise suppressor 16, the blowback sound generated when the exhaust brake is operated is attenuated.

When such an exhaust brake is operated during high speed driving, the inertial intake control valve 17 is open.

In other words, when driving at high speeds, the opening and closing timing of the intake valve (not shown) is quick, and the pulsation propagation time in the intake system due to blowback is short, so the split-type intake manifold 1
The air blown back from one side of 2 is passed through the bypass passage 14.
'' and interfere with each other, thereby increasing pumping loss and further improving the braking force as an engine brake.

Also, when such an exhaust brake is operated during low speed driving, the inertial intake control pulse 7'17 is closed.

That is, when driving at low speeds, the opening and closing timing of the intake valve is slow, and the pulsation propagation time in the intake system due to blowback is long. part 2
0 and 21 to the other side and interfere with each other, the pumping loss increases and the engine
The braking force as a brake is further improved.

According to this invention having the above structure, the braking effect of the engine brake by the exhaust brake device is improved, and it can be used even in vehicles with extremely heavy loading weights such as large trucks, and moreover, it can be used in internal combustion engines with a simple structure. is obtained.

[Brief explanation of drawings]

The figure is a schematic diagram showing a specific example of the internal combustion engine of the present invention applied to a large truck. 10... Internal combustion engine, 11... Exhaust manifold, 12
...Split type intake manifold, 13...Branch type intake pipe, 14...Bypass passage L15...Exhaust butterfly valve, 16...Noise suppressor, 1
7... Inertial intake control pulp, 19... Cylinder head.

Claims (1)

[Claims] An exhaust manifold connected to an exhaust port of a cylinder head, a split intake manifold connected to an intake port of the cylinder head, each of the split intake manifolds, and an air cleaner side. A bi-iJ? that connects each of the branched intake pipes to each other on the split intake manifold side. An internal combustion engine comprising: a gas passage; an exhaust butterfly fist valve provided on the exhaust manifold side of the exhaust manifold; and an inertial intake control pulp provided in the bypass passage to open and close the bypass passage.