JP3342185B2 - Fluid passage structure in cylinder block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid block structure in a cylinder block made by casting a dissimilar material member formed of a material different from the cylinder block body into a cylinder block body made of a light alloy.

[0002]

2. Description of the Related Art Conventionally, the cylinder block body of an internal combustion engine is formed by die casting of an aluminum alloy.
A cylinder liner block made of cast iron is inserted into the cylinder block body (Japanese Patent Laid-Open No. Hei 5-180066).
Reference).

[0003]

An oil passage for lubricating the crankshaft is formed in such a cylinder block. Usually, the oil passage is formed of a main gallery formed in an aluminum alloy cylinder block main body by a cast iron. Through a bearing portion formed in a cylinder liner block made of stainless steel and communicates with the outer periphery of the crankshaft.

However, as described above, when the oil passage is formed over the cylinder block body made of aluminum alloy and the cylinder liner block made of cast iron, the oil passage is formed due to the difference in thermal expansion coefficient between the aluminum alloy and the cast iron. There is a problem that a gap is likely to be generated at the interface of the oil and oil leaks from the gap.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in a cylinder block formed by casting a dissimilar material member in a cylinder block body made of light alloy, a fluid leak from a fluid passage formed therein is reduced. The purpose is to prevent it.

[0006]

In order to achieve the above object, according to the present invention, a dissimilar material member formed of a material different from that of the cylinder block body is provided in a cylinder block body made of light alloy. In the cast-in cylinder block, a fluid passage is formed in the light alloy cast in the through hole formed in the dissimilar material member so as not to reach the dissimilar material member.

According to a second aspect of the present invention, there is provided a cylinder block in which a dissimilar material member formed of a material different from the cylinder block body is cast in a light alloy cylinder block body. A fluid passage is formed so as not to face the cylinder block body made of an alloy.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the dissimilar material member is a cylinder liner block integrally provided with a bearing for supporting a crankshaft. The fluid passage formed in the portion is an oil passage for lubricating the crankshaft.

According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, the dissimilar material member includes a plurality of bearing portions for supporting a crankshaft and a reinforcing connecting portion for mutually connecting the bearing portions. Cylinder liner block with
The fluid passage as an oil passage for lubricating a crankshaft is formed in the bearing portion and the reinforcing connection portion.

[0010]

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a plan view of a cylinder block, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is an enlarged sectional view taken along line 3-3, and FIG. 4 is a sectional view of the cylinder liner block corresponding to FIG.

Cylinder block B for an in-line four-cylinder internal combustion engine
_C is a quad wet cylinder liner block B
_An open deck type having _L (different material members) is formed, and the cylinder block main body 1 as a main part thereof is formed by die casting of an aluminum alloy.

The cylinder block body 1 is
Part, cylinder barrel part 1 _UAnd its lower
Part, that is, the crankcase part 1_LAnd the above
Linda barrel part 1_UTo the cylinder block body 1
Four barrel holes 3 are opened to the
Cast iron having a lower coefficient of thermal expansion than aluminum alloy in the barrel hole 3
Four-piece wet-type cylinder liner block B_LNo
The inner portions 4 are integrally cast-molded. Each liner part 4
... are fitted with slidable pistons (not shown).
The formed cylinder bore 21 is formed.

A water jacket 5 that opens to the deck surface 2 is formed between the outer wall surface of the four wet cylinder liner blocks B _L and the inner wall surface of the barrel hole 3. The cooling water is circulated as shown in FIG.

Further oil passage 7 to the outer wall of the cylinder barrel 1 _U, through the cylinder head (not shown) thereon deck surface 2 of the bolt holes 6 ... and lubricants for bolted
... is drilled.

The cylinder block crank case portion 1 _L which constitutes the lower portion of the body 1, the cylinder barrel portion 1 horizontally extending downwardly from the bottom of the _U together skirt wall 8,
9, the cylinder barrel 1 _U of the longitudinal end walls 10,1
A plurality of bearing walls 13 extending downward from a constricted portion 12 between the one and four liner portions 4 to integrally connect and connect the left and right skirt walls 8, 9; The bearings 27 of the cylinder liner block _BL are cast inside. Each of the bearing portions 27 is formed with a semi-circular bearing hole 14 for supporting the crankshaft Sc, and a pair of bolt holes 15 formed on the lower surface thereof is formed with the semi-circular bearing hole 14. A bolt for coupling a bearing cap (not shown) that supports the crankshaft Sc in cooperation therewith is screwed.

Next, when the die casting of the cylinder block B _C, in detail the structure of the wet type cylinder liner block B _L of quadruplicate made the iron is insert cast integrally with the aluminum alloy cylinder block body 1 described I do.

The four wet cylinder liner blocks B _L have four liner portions 4 and five bearing portions 27. Adjacent liner portions 4 are connected to a common boundary wall 20. , And are so-called Siamese. The central three bearing portions 27 are each 2
The connecting portions 28 are integrally connected to the lower portions of the boundary walls 20. Further, two bearing portions 27, 27 at both ends are provided.
Are integrally connected to the lower portions of both end walls in the longitudinal direction of the liners 4.

A seal flange 22 is integrally formed on the outer periphery of the lower portion of the liners 4... Substantially horizontally in a direction substantially perpendicular to the cylinder axis, and projects over the entire periphery thereof. Formed into _one . Further, above the seal flange 22, on the outer periphery of the liner portions 4,..
, 24 ... are integrally provided vertically and horizontally, and these ribs 23 are provided.
, 24 ... are formed lower than the seal flange 22. Further, below the seal flange 22 of the liner portion 4, two upper and lower heat absorbing fins 29 sandwiched between two adjacent connecting portions 28, and a substantially full length on the outer periphery of the cylinder liner block _BL. And three small ribs for reinforcement 30 extending over the same are protruded integrally.

As is apparent from FIG. 4, each bearing portion 27 of the cylinder liner block _BL has a through hole 31 respectively.
Are formed. Therefore, the cylinder liner block B _L
When the shaft is cast into the cylinder block body 1, the bearing wall 1
Part of the molten aluminum alloy constituting the three through holes 31
… Into the inside. In the portion of the aluminum alloy that has flowed into the through-holes 31, an oil passage 33 (fluid) extending from the main gallery 7m, which is one of the oil passages of the cylinder block Bc, to the oil grooves 32 of the semicircular bearing holes 14. Passage) is drilled.

The lubricating oil supplied from the main gallery 7m passes through the oil passages 33 and the semicircular bearing holes 14 and so on.
Reaches the oil groove 32, and is supported by the crankshaft Sc.
Lubricate the outer periphery of At this time, since the entire length of the oil passages 33... Faces the aluminum alloy and does not pass through the interface with the cast iron, the cylinder block Bc changes in temperature and the aluminum alloy and the cast iron expand and contract at different thermal expansion rates. However, there is no possibility that oil leaks from the interface.

Next, a second embodiment of the present invention will be described with reference to FIG.

[0024] In the second embodiment, the liner section 4 lower ends of the one side wall of the cylinder liner block B _L and the bearing portion 2
7 are integrally connected to each other by a bulging portion 34, and the bulging portion 34 forms a main gallery 7m. The main gallery 7m communicates with the oil grooves 32 of the semicircular bearing holes 14 through oil passages 33 penetrating through the inside of each bearing portion 27.

According to the second embodiment, the oil passage 3
Since the entire length faces cast iron and does not pass through the interface with the aluminum alloy, even if the cylinder block Bc changes in temperature and the aluminum alloy and cast iron expand and contract with different coefficients of thermal expansion, the. There is no risk of oil leakage. Also,
The lower end of the liner portions 4 and the upper end of the bearing portions 27
4, the cylinder liner block B _L
Rigidity can be increased.

Next, a third embodiment of the present invention will be described with reference to FIG.

In the third embodiment, the five bearing portions 27 of the cylinder liner block _BL are connected by a cylindrical reinforcing connecting portion 35 integral with them. Oil passages 38 (fluid passages) formed so as to penetrate the inside in the axial direction communicate with the oil passages 33 reaching the semicircular bearing holes 14 through the insides of the respective bearing portions 27.

According to the third embodiment, as in the second embodiment, the occurrence of oil leakage from the oil passages 38, 33,... Can be prevented.
Can be increased in rigidity.

[0029]

[0030]

[0031]

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made.

For example, the fluid passage in the first and second aspects of the present invention is not limited to a passage for lubricating oil, but may be a passage for another fluid such as cooling water.

In the embodiment, the cylinder block body is made of an aluminum alloy, and the cylinder liner block is made of cast iron. However, the materials are not limited to those of the embodiment.

Further, in the embodiment, the cylinder liner block for four cylinders is illustrated, but the present invention can be applied to other cylinder liner blocks for multiple cylinders and single cylinders.

Further, in the embodiment, the cylinder liner block is of a wet type, but it is needless to say that this can be applied to a dry type.

[0037]

As described above, according to the first aspect of the present invention, a through-hole is formed in a dissimilar material member cast in a light alloy cylinder block body, and the through-hole is formed in the through-hole. Since the fluid passage is formed in the cast light alloy so as not to reach the dissimilar material member, the fluid passage does not pass through the interface between the light alloy and the dissimilar material, thereby ensuring fluid leakage from the interface. Can be prevented.

According to the invention described in claim 2,
The fluid passage is formed in the dissimilar material member cast in the light alloy cylinder block body so as not to face the light alloy cylinder block body, so the fluid passage passes through the interface between the light alloy and the dissimilar material. Accordingly, fluid leakage from the interface can be reliably prevented.

According to the invention described in claim 3,
The dissimilar material member is a cylinder liner block integrally provided with a bearing for supporting the crankshaft, and the fluid passage formed in the bearing is an oil passage for lubricating the crankshaft, so that there is no lubricating oil leakage. The crankshaft can be reliably lubricated.

According to the invention described in claim 4,
A cylinder liner block integrally provided with a plurality of bearings in which different kinds of material members support a crankshaft and a reinforcing connection that mutually connects the bearings, and an oil that lubricates the bearing and the reinforcing connection with the crankshaft. Since the fluid passage as the passage is formed, the crankshaft can be surely lubricated without causing the leakage of the lubricating oil, and the rigidity of the bearing portion can be increased by the reinforcing connection portion.

[0041]

[Brief description of the drawings]

FIG. 1 is a plan view of a cylinder block according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a sectional view of the cylinder liner block corresponding to FIG. 3;

FIG. 5 corresponds to FIG. 4 according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a cylinder liner block according to a third embodiment of the present invention .

[Explanation of symbols]

1 cylinder block body 27 bearing portion 31 through hole 33 oil passage (fluid passage) 35 reinforcing connecting portion 38 oil passage (fluid communication path) B _L cylinder liner block (dissimilar material member) Sc crankshaft

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyoshi Komori 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Technical Research Institute Co., Ltd. (56) References JP-A-5-180066 (JP, A) 56-156947 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01M 1/06 B22D 19/08 F02F 1/00

Claims (4)

(57) [Claims] Cylinder block body made of light alloy (1)
In a cylinder block formed by casting a dissimilar material member (B _L ) formed of a different material from the cylinder block body (1), the cylinder block is cast into a through hole (31) formed in the dissimilar material member (B _L ). A fluid passage structure in a cylinder block, wherein a fluid passage (33) is formed in the light alloy so as not to face the dissimilar material member (B _L ). 2. A cylinder block body (1) made of a light alloy.
In the cylinder block body (1) and the different materials forming the dissimilar material member (B _L) cylinder block made of a cast Gurung within, the different material member (B _L) in a light alloy cylinder block body (1) A fluid passage structure in a cylinder block, characterized in that fluid passages (33, 38) are formed so as not to face. 3. A cylinder liner block in which said dissimilar material member (B _L ) is integrally provided with a bearing (27) for supporting a crankshaft (Sc), and a fluid passage formed in said bearing (27). 3. An oil passage for lubricating a crankshaft, wherein (33, 38) is an oil passage for lubricating a crankshaft (Sc).
A fluid passage structure in the cylinder block described in the above. 4. A plurality of bearings (27) in which said dissimilar material members (B _L ) support a crankshaft (Sc) and a reinforcing connecting part (35) for mutually connecting said bearings (27). And a crankshaft (Sc) attached to the bearing portion (27) and the reinforcing connecting portion (35).
Characterized in that the formation of the fluid passage as an oil passage for lubricating (33 and 38), and fluid passage structure in the cylinder block of claim 2 wherein.