Installation structure of fuel injection valve

A technology of fuel injection valve and structure, which is applied in the direction of fuel injection devices, charging systems, engine components, etc., which can solve the problems of increased manufacturing costs, complex structures of cylinder heads or cages, and heat dissipation parts, and achieve suppression of high temperature, Effect of suppressing increase in manufacturing cost

Inactive 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

[0008] However, in the structures of Patent Documents 1 to 3, the structure of the cylinder head, the cage, and the heat dissipation member become complicated, or special parts such as a gas seal member with a special shape are required.
On the other hand, in the structure of Patent Document 4, in order to bring the heat insulating sleeve into elastic close contact with the nozzle or the housing hole of the cylinder head, precise processing is required.
Therefore, in any of the above-mentioned structures, the manufacturing cost will increase

Method used

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  • Installation structure of fuel injection valve
  • Installation structure of fuel injection valve
  • Installation structure of fuel injection valve

Examples

Experimental program
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no. 1 approach 》

[0045] refer to Figure 1 ~ Figure 4 , First, the first embodiment will be described. figure 1 It is a schematic sectional view of the sub-chamber internal combustion engine of the first embodiment. Such as figure 1 As shown, the internal combustion engine 1 has an engine body 4 comprising a cylinder block 2 and a cylinder head 3 fastened to the upper end face of the cylinder block 2 . In the cylinder block 2, a cylinder 5 having a circular cross-section opening on the upper end surface of the cylinder block 2 is formed. Let the axis of cylinder 5 be cylinder axis A. 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 surface 7 constituting the upper end of the cylinder 5 . The combustion chamber wall surface 7 is formed in a so-called roof shape.

[0046] A piston 11 is accommodated in the cylinder 5, and the piston 11 can reciprocate along the cylinder axis A. As shown in F...

no. 2 approach 》

[0072] Next, refer to Figure 5 A second embodiment will be described. In addition, the same or the same elements as those in the above-mentioned embodiment are assigned the same reference numerals or corresponding reference numerals having the same digit, and overlapping explanations are omitted. The same applies to the following embodiments.

[0073] Figure 5 It is a perspective view showing the state before attachment of the cylindrical member 40 of 2nd Embodiment. In this embodiment, the structure and manufacturing method of the cylindrical member 40 differ from 1st Embodiment. Specifically, the cylindrical member 40 is obtained by processing a steel pipe having a circular or hexagonal cross-section into a tapered regular polygonal cross-section (regular hexagonal cross-section in the illustrated example) by pipe expansion or die forging. Metal cylinder, constructed without slit 30C ( figure 2 ) closed section shape.

[0074] When the base end side of the cylindric...

no. 3 approach 》

[0078] Next, refer to Figure 6 A third embodiment will be described. Figure 6 is equivalent to the tubular member 50 of the third embodiment Figure 4 An enlarged sectional view of the base end side of the main part. In the present embodiment, in a state before being inserted into the injector attachment hole 26 , the base end side of the cylindrical member 50 is curved so that the center of the width direction of each side portion 50A is convex inward as shown by a phantom line. A shape that is closer to a star than a regular hexagon.

[0079] Such as Figure 6 As shown, the base end side of the cylindrical member 50 is elastically deformed in such a manner that the maximum cross-sectional dimension of the outer profile is reduced when inserted into the injector mounting hole 26 . The elastic deformation of the proximal end side of the cylindrical member 50 is caused by bending deformation of the corner portion 50B that increases the radius of curvature of the corner po...

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Abstract

The invention provides an installation structure of a fuel injection valve. The installation structure can inhibit high temperature of a nozzle, and reduces the manufacturing cost. The installation structure comprises an engine body (4), which is provided with an ejector installation hole (26) that is communicated with an auxiliary combustion room (24); a cylindrical part (30), which is inserted into the ejector installation hole (26); and an ejector (31), which is inserted into the cylindrical part (30) and is provided with a nozzle (31C) that sprays fuel to the auxiliary combustion room (24). The cylindrical part (30) is provided with a polygonal cross section having a plurality of edges (30A) and a plurality of corners (30B). The shape of the cross section of the tail end of the auxiliary combustion room (24) is smaller than the shape of the cross section of the opposite basal end of the auxiliary combustion room (24). In the basal end side, the corners (30B) are elastically abuttedon the internal circumferential surface of the ejector installation hole (26), and in the tail end side, the edges (30A) are elastically abutted on the external circumferential surface of the nozzle(31C).

Description

technical field [0001] The present invention relates to a mounting structure of a fuel injection valve. Background technique [0002] With regard to a direct-injection fuel injection valve that directly injects fuel into a cylinder, since the nozzle is exposed to combustion gas, it tends to become high in temperature. When the nozzle of the fuel injection valve is at a high temperature, deposits due to the accumulation of coal are generated to clog (narrow) the injection hole and reduce the fuel injection amount. In order to prevent this, various proposals have been made, for example, a structure in which a cooling jacket is formed in a holder holding a fuel injection valve, and the tip of the fuel injection valve is cooled by cooling water (for example, Patent Document 1); A housing enlargement with a plurality of projections for heat dissipation is provided on the housing of the fuel injection valve to form a heat dissipation structure (for example, Patent Document 2); A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/14
CPCF02M61/14
Inventor 中西启太朗
Owner HONDA MOTOR CO LTD
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