JPS60219436A - Engine block - Google Patents

Abstract

PURPOSE:To improve strength, by a method wherein the bearing part of a housing cap is formed by an internal chilled-iron series material. CONSTITUTION:In an engine block comprising a block body (a), a housing cap (b), and a crank shaft part (c), an internal chill substance (d), made of an iron series material, is internally chilled, and this prevents widening of a gap (f) due to an increase in a rate of thermal expansion peculiar to an aluminum alloy. A trouble on a bearing part, caused by a difference in a rate of thermal expansion between the housing cap (b) made of an aluminium alloy and the crank shaft (c) made of an iron series material, is eliminated, and this enables production of a cylinder block made of an alluminium alloy, resulting in improvement of strength.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine block made of an aluminum alloy, which includes a block body, a housing, and a ring cap.

(Prior art) In order to reduce the weight of an engine, it is essential to make the engine block made of aluminum alloy. The heat generated by this process causes thermal expansion in the engine block itself, and due to the difference in coefficient of thermal expansion between the crankshaft and the crankshaft, which is made of iron-based materials, a gap (in the e direction) is created in the bearing part that supports rotational motion. There is a problem that a gap f1 (see Fig. 8) is created due to the tension of ffAQN, making it difficult to continue the movement.

(Objective of the Invention) The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide an engine block that does not have an extra gap in the bearing part even if it is made of aluminum alloy. It is something to do.

(Structure of the Invention) In order to achieve the above object, the structure of the present invention is that the bearing part of the housing cap made of aluminum alloy, which is attached to the lower part of the block body made of hard aluminum alloy, is formed by casting an iron-based material. It is characterized by

With this configuration, 1. − Based on the difference in thermal expansion coefficient
Prevent occurrence between I'j'I+11. It is an fc thing.

(Example) Below, one part of the present invention, hID 1+ll, will be explained based on [31].

) In Figures S1 to 4↓8, the engine block (made of aluminum alloy) consisting of the block body a, the housing cap [], and the crankshaft C is shown as CX.
E 21 RI 2i I - Figure 4
4'4''' r to prevent the gap f from widening due to the large size of the aluminum base lr.44 The gun shown in lnj Due to the J-shape of the stuffed product d, 1'i stretches in the direction of e.
It is important to prevent the receiving surface from collapsing.

Correctly from beginning to end in oil-filled products or aluminum alloys (XL
h, '4If/'+, 4jC1 An undercut of ri and l was provided for the external force in the h direction in the diagram.

Also, for the load jK in the jj direction (slis), k becomes an undercut. All of these undercuts are cast into Hakushu. Due to the casting force caused by the contraction of the molten metal, the furnace 1-filled product (1+rt/%Using cap b
It is possible to support various loads by being fixed inside. As a result, the appropriate gap a-α of the bearing portion, which is the support portion of the rotation i'l town%+, becomes 11 times, and at the same time, the strength of the bearing surface becomes the same as above.

The shape of the cast product d is such that it can be manufactured using -J construction (see Fig. 5), and the manufacturing cost can be reduced.

FIG. 6 shows the process of casting the cast product d by the die-casting method. t, 01 Insert rectangular J-gurumi item d between both molds ζ
Then, the position is determined by the positioning bin P. The mold is closed by turning 11 as indicated by the arrow S of the mold m. At this time, since the cast member d placed inside cannot move freely in the t direction -\, it may move due to the pressure of the molten metal or the like. The diameter of pin r is set to be equal to or larger than the diameter of hole q, to prevent lifting. In addition, hole q
-U is also used to guide the jig for automatically inserting the cast product d into the mold.

(Effects of the Invention) 9 As described above, according to the present invention, the bearing portion of the housing cap is formed by cutting through one piece of iron-based material, so that the housing cap is made of aluminum alloy ψ and made of iron-based material. The heat with the crankshaft becomes 1% 4J 'jJf
Problems in the bearing due to the difference in rate have been eliminated by IQ, and the actual +M and +IJ' of the aluminum alloy cylinder cylinders have been eliminated.
It becomes a fit, and it is made of aluminum alloy only. I*, the result is that rigidity is obtained and strength is greatly improved.

[Brief explanation of the drawing]

FIG. 1 shows the entire construction/jinbook 121, OS 21., of one embodiment of the present invention. =(, is If of the 11th gl
- If the cross section along a is 1 closed, Figure 3 is an enlarged plan view of the 4th part, Figure 4 is a partial cut of the housing camp.
Figure 5 is a perspective view of a gun-filled product, Figure 836 is an explanation of the casting method, Hr+Δ is an explanation of part 1 of Figure 6.
yAX FIG. 8 is an explanation of the λ shaking key when the fishing rod force is 1 (t7). a...Block body b...Housing cap d
... Castings. %:i: 1 "Sl 'z,";4,' - Soyo, -51

Claims (1)

[Claims] (1) An engine block characterized in that the bearing portion of the aluminum alloy housing cap attached to the lower part of the aluminum alloy block body is formed by casting an iron-based material.