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Method of adjusting capacities of combustion chambers of a multi-cylinder engine

A technology of engines and combustion chambers, applied in the direction of engine components, machines/engines, cylinders, etc., can solve problems such as abnormal combustion, different volumes of combustion chambers, adverse effects of engine combustion state, etc.

Inactive Publication Date: 2014-11-19
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] If a difference in shrinkage occurs in the combustion chamber of the cylinder head material due to curing characteristics, the volume of the combustion chamber of the cylinders is different, so that uniform combustion of each cylinder cannot be obtained, and it will adversely affect the combustion state of the engine
Also, in a high compression ratio engine, if the balance between the predetermined fuel supply amount, compression ratio and ignition timing is missing, abnormal combustion as described above can occur

Method used

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  • Method of adjusting capacities of combustion chambers of a multi-cylinder engine
  • Method of adjusting capacities of combustion chambers of a multi-cylinder engine
  • Method of adjusting capacities of combustion chambers of a multi-cylinder engine

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no. 1 example

[0032] The following reference Figure 1-9 The first embodiment of the present invention will be described in detail.

[0033] In the inline four-cylinder engine, the cylinder head material is integrally cast using a metal material such as an aluminum alloy, and the cutting portion (machined portion) that cuts the cylinder head material forms the cylinder head 1 . The engine equipped with the cylinder head 1 is a high compression ratio engine in which the compression ratio is set at 14:1, and the fuel supply amount and ignition timing are controlled according to the compression ratio.

[0034] First, the structure of the cylinder head 1 after cutting will be described.

[0035] The cylinder head 1 includes four recessed portions 2 each partially forming a combustion chamber of the cylinder, and a mating surface 3 mating with a cylinder block (not shown). The cylinder head 1 is connected to the upper part of the cylinder block. Since the four cylinders have a similar structu...

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Abstract

This disclosure provides a method of adjusting capacities of combustion chambers of a multi-cylinder engine having a cylinder head with recessed parts that partially form the combustion chambers and a mating surface for mating with a cylinder block, which includes casting a cylinder head material having flat reference surfaces on top of the recessed parts of the cylinder head, machining the cylinder head material to form the mating surface, measuring distances in a height direction from the mating surface to the reference surfaces, respectively, and adjusting machining margins of machining portions of the reference surfaces of the recessed parts based on the measured height direction distances.

Description

technical field [0001] The present invention relates to a method of adjusting the volume of a combustion chamber of a multi-cylinder engine, and more particularly to a method of adjusting the volume of a combustion chamber of a multi-cylinder engine in which the casting is adjusted by using the cutting allowance (machining allowance) of the surface of the combustion chamber The combustion chamber volume of the molded cylinder head. Background technique [0002] Generally, since the theoretical thermal efficiency of a spark ignition gasoline engine increases in proportion to a compression ratio that can be as high as about 17:1, an increase in compression ratio is considered an effective means of improving fuel consumption. Furthermore, a roof-shaped combustion chamber in which the intake port side slope and the exhaust port side slope are formed in a roof shape is known to be a combustion chamber structure effective for realizing a high compression ratio. The roof-shaped co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F1/24
CPCB23P13/02B23P6/02F02F2200/06Y10T29/4927
Inventor 山本刚中原康志山田孝之林一哉池田雄一郎
Owner MAZDA MOTOR CORP