JPS634007B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake system for an internal combustion engine.
This system uses the intake pulsating pressure in the intake passage and the exhaust pulsating pressure in the exhaust passage to increase intake efficiency and, in turn, improve engine output.

To explain this with reference to the illustrated embodiment, 1 is a cylinder, 2 is a piston, and 3 is a combustion chamber, and an intake passage 5 connected to the combustion chamber 3 via an intake valve 4 includes:
An intake communication passage 7 is provided through an intake breathing nozzle 6 that opens near the intake valve 4, and the combustion chamber 3
An exhaust passage 9 connected to the exhaust valve 8 via an exhaust valve 8 is provided with an exhaust communication passage 11 via an exhaust breathing nozzle 10 located near the exhaust valve 8 and opened, and these intake/exhaust communication passages 7 and 11 are connected to each other. The chamber 12 is connected to a chamber 12 having a predetermined volume, and the chamber 12 is provided with a partition wall 13 that variably partitions a first chamber 12a that communicates with the intake communication passage 7 and a second chamber 12b that communicates with the exhaust communication passage 11. Provided, the partition wall 1
3 is formed into a piston having a piston ring 13a that slides on the inner wall of the chamber 12, and a resilient device consisting of a balance spring is provided in each of the first and second chambers 12a and 12b so as to maintain the neutral position at all times. 14 have been installed. As shown in FIG.
It was installed at an angle. In the figure, 15 indicates a spark plug, and 16 indicates a carburetor.

Since the present invention is configured as described above, the inner partition wall 13 of the chamber 12 is pulled toward the first chamber 12a by the negative pressure in the combustion chamber 3 caused by the lowering of the piston 2 at the same time as the intake valve 4 opens.
Next, when the suction valve 4 closes, the rebound device 14 operates to try to return to the neutral position, and at this time, the volume of the first chamber 12a increases, so that the suction action is extended even after the suction valve 4 is closed. The first chamber 12a is filled with an air-fuel mixture to prepare for the next phase of suction stroke. Since there is an exhaust process immediately before the next intake stroke, the positive pressure near the exhaust valve 8 is applied to the second chamber 12b via the exhaust communication passage 11 during this exhaust process, so the partition wall 13 is moved. The air-fuel mixture filled in the first chamber 12a is pushed out, thus more air-fuel mixture flows during the suction stroke, the suction efficiency is increased, and the pumping loss in the intake passage is reduced by this suction pump action. .

Note that the intake breathing nozzle 6 is connected to the combustion chamber 3 as described above.
Since the opening is directed toward the outer periphery of the air-fuel mixture, a vortex is created in the combustion chamber when the air-fuel mixture is pushed out, which improves the agitation and exposure of the air-fuel mixture, improving combustion efficiency, output, and fuel efficiency. Can be done.

In this way, according to the present invention, a chamber is interposed in the communication passage that communicates the intake passage and the exhaust passage of the internal combustion engine, and the chamber includes a first chamber that communicates with the intake passage and a second chamber that communicates with the exhaust passage. The chamber is provided with a partition wall that partitions the chamber into a variable volume section, and is equipped with an elastic device that maintains the partition wall in a neutral position at all times, so that the chamber fills and discharges the air-fuel mixture using intake pulsating pressure and exhaust pulsating pressure. It acts as a suction pump, thus allowing more air-fuel mixture to flow during the suction stroke and increasing suction efficiency, which has the effect of improving engine output and fuel efficiency, as well as reducing pumping loss in the intake passage.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view, and FIG. 2 is a view taken along the line AA in FIG. 1. 5...Intake passage, 7...Intake communication passage, 9...Exhaust passage, 11...Exhaust communication passage, 12...Chamber, 13
...Partition wall, 14...Explosive device.

Claims (1)

[Claims] 1. A chamber is interposed in a communication passage that communicates an intake passage and an exhaust passage of an internal combustion engine, and the chamber is divided into a first chamber communicating with the intake passage and a second chamber communicating with the exhaust passage in a variable volume manner. 1. An intake system for an internal combustion engine, comprising a partition wall and an elastic device that normally holds the partition wall in a neutral position.