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Internal combustion engine

An internal combustion engine and fuel technology, which is applied in the direction of internal combustion piston engine, combustion engine, mechanical equipment, etc., can solve the problems of flame volume fluctuation, calorific value fluctuation, and decrease of combustion stability of the main combustion chamber.

Active Publication Date: 2018-10-23
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there are problems in that the calorific value in the sub chamber fluctuates, the amount of flame ejected from the communication hole fluctuates, and the combustion stability in the main combustion chamber decreases.

Method used

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  • Internal combustion engine
  • Internal combustion engine
  • Internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0050] The internal combustion engine 1 is a four-stroke mechanism, such as figure 1 As shown, there is an engine main body 4 including a cylinder block 2 and a cylinder head 3 fastened to the upper end surface of the cylinder block 2 . A cylinder 5 having a circular cross section opening to an upper end surface of the cylinder block 2 is formed in the cylinder block 2 . Let the axis of cylinder 5 be cylinder axis Z. A portion of the lower end surface of the cylinder head 3 facing the upper end of the cylinder 5 is recessed upward to form a combustion chamber wall 7 constituting the upper end of the cylinder 5 . The combustion chamber wall surface 7 is formed in a so-called roof shape.

[0051] A piston 11 is housed in the cylinder 5 so as to be able to reciprocate along the cylinder axis Z. As shown in FIG. The combustion chamber wall 7 cooperates with the top surface of the piston 11 to form a main combustion chamber 12 . The piston 11 is connected to a crankshaft (not s...

no. 2 Embodiment approach

[0071] In the second embodiment, the number, position, and diameter of the communication holes 34 are different from those of the first embodiment, and the other configurations are the same as those of the first embodiment. Such as image 3 As shown, in the second embodiment, six communication holes 34 are provided, and the opening ends of the main combustion chamber 12 side of each of the two communication holes 34C face the first area 51 and the third area 53, and each of the communication holes 34D is one The opening end on the side of the main combustion chamber 12 faces the second area 52 and the fourth area 54 . The two communication holes 34C in each of the first region 51 and the third region 53 are arranged offset to the center side of each region 51 , 53 , that is, to the side of the first axis X. Accordingly, the angle between two adjacent communication holes 34C is set to be smaller than the angle between two adjacent communication holes 34C and 34D. Each of the ...

no. 3 Embodiment approach

[0073] In the third embodiment, the number, position, and diameter of the communicating holes 34 are different from those of the first embodiment, and the other configurations are the same as those of the first embodiment. Such as Figure 4 As shown, in the third embodiment, six communication holes 34 are provided, and the opening ends of the main combustion chamber 12 side of each of the two communication holes 34E face the first area 51 and the third area 53, and each of the communication holes 34F is one The opening end on the side of the main combustion chamber 12 faces the second area 52 and the fourth area 54 . The two communication holes 34E in each of the first region 51 and the third region 53 are arranged offset to the center side of each region 51 , 53 , that is, to the side of the first axis X. Accordingly, the angle between two adjacent communication holes 34E is set to be smaller than the angle between two adjacent communication holes 34E and 34F. Each communic...

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PUM

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Abstract

The invention provides an internal combustion engine. In the internal combustion engine having a sub-chamber, the mixed gas in the main combustion chamber is efficiently combusted. The internal combustion engine (1) has a main combustion chamber (12); a sub-chamber (24) disposed at the center of the main combustion chamber; a plurality of communication holes (34) communicating with the sub-chamberand the main combustion chamber; an injector (46) which injects fuel into the main combustion chamber; a spark plug (42) having an ignition portion disposed in the sub-chamber. By the fuel injectionof the injector, a high concentration region having a relatively high fuel concentration and a low concentration region having a relatively low fuel concentration are formed in the circumferential direction of the main combustion chamber at the ignition timing, and the plurality of communication holes are set to be high. The sum of the flow path areas of the concentration regions is larger than the sum of the flow path areas toward the low concentration regions.

Description

technical field [0001] The present invention relates to an internal combustion engine provided with a sub chamber. Background technique [0002] A sub-chamber internal combustion engine having a combustion chamber divided into a main combustion chamber and a sub-chamber is known. The sub-chamber type internal combustion engine ignites the air-fuel mixture in the sub-chamber, and ignites the air-fuel mixture in the main combustion chamber by a torch-shaped flame sprayed from the sub-chamber to the main combustion chamber through a communication hole. In such an auxiliary chamber type internal combustion engine, the auxiliary chamber is arranged in the center of the main combustion chamber in some cases, and the communication holes are radially arranged at equal intervals along the circumference, so that the flame sprayed from the communication holes is evenly distributed in the main combustion chamber. Combustion chamber (for example, Patent Document 1). [0003] prior art ...

Claims

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Application Information

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IPC IPC(8): F02B19/10F02B19/12F02B19/18
CPCF02B19/108F02B19/12F02B19/18Y02T10/12
Inventor 竹形徳之中西启太朗
Owner HONDA MOTOR CO LTD