JPH05180066A - Cylinder liner block for cylinder block - Google Patents

Abstract

PURPOSE:To provide thinness of a bearing wall in a crankcase part by providing a liner part cast by an internal chill in a cylinder barrel part of a cylinder block main unit and a reinforced wall part cast by an internal chill in the bearing wall of the crankcase part. CONSTITUTION:A cylinder block, for instance, having a 4-set wet cylinder liner block BL, is constituted into an open deck type, and a cylinder block main unit 1, by which the main unit part is formed, is made by die-casting an aluminum alloy. That is, a cylinder liner block, cast by an internal chill in the cylinder block main unit 1, is constituted of material of rigidity larger than that of the cylinder block main unit 1. The cylinder block comprises a liner part 4 cast by an internal chill in a cylinder barrel part 1U of the cylinder block main unit 1 and a reinforced wall part 27 cast by an internal chill in a bearing wall 13 of a crankcase part 1L, of the cylinder block main unit. In this way, rigidity of the bearing wall 13 of the crankcase part 1L is improved, and in its turn, performance of an internal combustion engine is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder liner block for a cylinder block of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a cylinder block of an internal combustion engine is formed by high pressure casting such as die casting, but a cylinder liner forming a cylinder of the cylinder block is formed in a cylindrical shape and forms a main part of the cylinder block. It is cast around the cylinder barrel portion of the block body (see Japanese Utility Model Publication No. 1-282889).

[0003]

By the way, since the conventional cylinder liner is cast around the cylinder barrel portion of the cylinder block, its main purpose is to improve the wear resistance of the cylinder on which the piston slides. Does not function to improve the rigidity of the cylinder block itself, particularly the rigidity of the bearing wall that supports the crankshaft of the crankcase portion.

The present invention has been made in view of such circumstances, and the cylinder liner has not only the original function but also the rigidity of the cylinder block itself, particularly the rigidity of the bearing wall of the crankcase portion, and the performance of the internal combustion engine. It is an object of the present invention to provide a new cylinder liner block for a cylinder block, which is improved, reduced in size, and reduced in cost.

[0005]

To achieve the above object, a feature of the present invention is a cylinder liner block that is cast in a cylinder block body and has a rigidity higher than that of the cylinder block body. A liner portion made of a material and formed around the cylinder barrel portion of the cylinder block body, and a reinforcement wall portion formed around the bearing wall of the crankcase portion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the cylinder block,
2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. 1, and FIG. 4 is a sectional view taken along line 4-4 of FIG. The structure of the cylinder block B _C will be described with reference to these drawings.

In-line four-cylinder internal combustion engine cylinder block B
_C is an open deck type having four series of wet type cylinder liner blocks _BL , and the main body of the cylinder block body 1 is formed by die casting of an aluminum alloy.

The cylinder block body 1 has its assembly
Pa part, that is, cylinder barrel part 1 _UAnd the lower
Part, that is, the crankcase part 1_LAnd consists of
Upper part 1_UOn the deck surface 2 of the cylinder block body 1
Four barrel holes 3 to open are opened.
Inside are four cast iron wet type sillins, which will be described in detail later.
Darina Block B_LThe liner part 4 of the
Shaped. Cylinder liner block B_LLiner section
4 is the four 1st to 4th wet liners 4₁~ 4_FourSerially
Well, each wet liner 4₁~ 4_FourEach has a figure
Cylinder bore in which piston not shown is slidably fitted
21 is formed.

A water jacket 5 which opens to the deck surface 2 is formed between the outer wall surface of the four continuous wet type cylinder liner blocks _BL and the inner wall surface of the barrel hole 3, and the water jacket 5 is usually formed in the water jacket 5. Cooling water is circulated as in.

[0011] the outer wall of the cylinder barrel 1 _U is on the deck surface 2, bolt holes 6 for mounting the cylinder head (not shown), an oil passage 7 or the like of the flow of the lubricating oil is bored.

The crankcase portion 1 _L forming the lower portion of the cylinder block body 1 has left and right skirt walls 8 extending downward from the lower portion of the cylinder barrel portion 1 _U integrally.
9 and both longitudinal end walls of the cylinder barrel 1 _U 10, 1
Wherein from 1 and the first to fourth wet liners 4 neck portion 12 between _{1-4 4} is extended downward lateral skirt wall 8,
A plurality of first to fifth bearing walls 13 ₁ for connecting and connecting 9 together
To 13 and a _5, each bearing wall _{131-134 5,} first to fifth reinforcing walls 27 ₁ to 27 ₅ is cast is Guruma described later of the crank case portion 1 _L of the cylinder liner block B _L, they A semi-circular bearing hole 14 for the crankshaft S _L and a pair of bolt holes 15 for attaching a bearing cap (not shown) are formed on the lower surface of the bearing hole 14, respectively.

Next, referring to FIGS. 5 to 11, the four wet cast cylinder liner blocks made of cast iron that are integrally formed in the aluminum alloy cylinder block body 1 during die casting of the cylinder block B _C. The structure of _BL will be described in detail.

FIG. 5 is a front view of the cylinder liner block _BL , FIG. 6 is a partially cross-sectional plan view taken along line 6-6 of FIG. 5, and FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. FIG. 8 shows 8 of FIG.
An end view taken along line -8, FIG. 9 is a sectional view taken along line 9-9 of FIG. 5, FIG. 10 is a sectional view taken along line 10-10 of FIG. 9, and FIG. It is a partial transverse bottom view along a line.

The four wet type cylinder liner blocks B _L have the liner portion 4 and the reinforcing wall portion 27, and the liner portion 4
Is four cylindrical first to fourth wet liners 4 ₁ to _{4 4}
And the adjacent wet liners are connected to each other through a common boundary wall 20 to form a so-called siamese. And the first to fourth wet liner ₄₁ to _4, the cylinder bore 21 the piston (not shown) each of which is slidably fitted is formed.

As clearly shown in FIGS. 5, 8 and 9, a seal flange 22 is integrally formed on the outer periphery of the lower portion of the liner portion 4 substantially horizontally in a direction substantially orthogonal to the cylinder axis l-l over the entire periphery thereof. The upper surface of the seal flange 22 is formed as a flat seal surface 22 ₁ .

Above the seal flange 22, vertical and horizontal ribs 23 and 24 for reinforcement and spacers are integrally and vertically provided on the outer periphery of the liner portion 4, and these ribs 23 and 24 are formed as described above. It is formed lower than the seal flange 22. Further, a plurality of reinforcing small ribs 30 that are substantially parallel to the seal flange 22 are integrally provided on the liner portion 4 below the seal flange 22 so as to integrally project.

The reinforcing wall portion 27 of the crankcase portion 1 _L of the cylinder liner block _BL is arranged between the end walls 25, 26 in the longitudinal direction of the liner portion 4 and the first to fourth wet liners 4 ₁ to 4 _4. It consists first to fifth reinforcing walls 27 ₁ to 27 ₅ which are arranged together in parallel to each other from the lower portion of the boundary wall 20, which are of aluminum alloy cylinder block body 1,
Guruma are cast integrally with the first to fifth bearing wall _{131-134 5} during casting. And on the lower surface of these reinforcing walls 27 ₁ to 27 _5, the bonding surface 31 and the bearing hole 14 for joining a bearing cap (not shown), respectively, bolt holes 1
5 etc. are formed.

As shown in FIG. 10, and the boundary wall 20 of the liner portion 4, the first to the fifth reinforcing walls 27 ₁ to 27 ₅ are integrally connected to each other by connecting walls 28,該連sealing wall 28 It is formed thick in the width direction to secure a relatively large volume, and a plurality of relatively long heat-absorbing fins 29 project from the outer periphery of the connecting wall 28. Thus, the connecting wall 28 having a large volume functions as a chiller so as to favorably heat the molten aluminum when the aluminum alloy cylinder block B _C is die-cast. ..

12 to 14 show a die for die casting the cylinder block B _C and the casting process thereof.

In these figures, the mold M is a fixed mold 40, left and right side movable molds 41 and 42 which can be moved in the lateral direction so that they can approach and separate from each other, and the fixed mold 40.
And a movable molding surface 43 that can move up and down with respect to each other. A convex molding surface 40 ₁ is formed on the fixed mold 40, and the left and right movable molds 41 and 42 face each other. 41 ₁ and 42 ₁ are formed, and the upper surface movable mold 43 is further formed.
The molding surface 4 facing the molding surface 40 ₁ of the fixed mold 40.
3 ₁ is formed, and a cylindrical bore pin 44 for forming the cylinder bore 21 is vertically installed integrally on the molding surface 43 ₁ and surrounds the bore pin 44 with an annular gap 46. As described above, the hollow cylindrical jacket pin 45 is suspended integrally, and the jacket pin 45 extends to the middle of the bore pin 44.

As shown in FIGS. 12 and 13, each bore pin 44
The cylinder bore 21 of the cylinder liner block _BL is fitted to the lower side of the cylinder bore 21, and the vertical and horizontal ribs 2
The outer peripheral surface projecting from the 3,24 are fitted to the inner circumferential surface of the jacket pin 45, the free end of the jacket pin 45 is abutted on the seal surface 22 ₁ of the sealing flange 22, the abutment surface Is formed on the molten metal-tight sealing surface so that the molten metal does not flow during die casting.

A small gap (0.2 to 0.3 mm) is formed between the bore pin 44 and the inner surface of the wet liner 4, and the outer surfaces of the vertical and horizontal ribs 23, 24 of the wet liner 4 are the inner peripheral surface of the jacket pin 45. Face to face or abut with a small gap (0.2 to 0.3 mm). Then, a gap 48 through which the molten aluminum does not flow is formed by the vertical and horizontal ribs 23, 24 between them.

As described above, the bore pin 44 has the liner portion 4
1st to 4th wet liner 4₁~ 4 _FourMating each
After that, move the upper and lower movable dies 41 and 42 in the closing direction, and
If the movable side mold 43 is moved in the closing direction without moving,
As described above, the mold M is closed, and the molding surface of the mold M and the mold
Linda Liner Block B_LAnd cavity 49 is formed
Aluminum is passed through the sprue 50 into the cavity 49.
If the molten metal is poured under a predetermined pressure and cooled,
Cylinder liner block B in Mi alloy matrix_LBut
Cylinder block B, which is integrally cast and wrapped_CIs molded
It

By the way, when the cavity 49 is filled with molten aluminum in the casting step, the seal flange 2
Since the free ends of the jacket pins 45 are abutted on the second sealing surface 22 ₁ , the molten metal does not enter between them, and the jacket pins 45 and the first to fourth wet liners 4 ₁ to 4 _A space 48 into which the molten metal does not flow is held between the spaces ₄ , and the space 48 forms a part of the water jacket 5 after the mold M is released. Due to the pressurized pouring of the molten metal into the cavity 49, a lateral pressure acts on the outer peripheral surface of the jacket pin 45 as shown by the arrow a in FIG. 14, but this lateral pressure is transmitted to the highly rigid bore pin 44 via the liner portion 4. This prevents the jacket pin 45 and the wet liner 4 from being deformed.

The first to fifth reinforcing walls 27 ₁ to 27 of the reinforcing wall portion 27 which is the lower portion of the cylinder liner block B _L.
7 ₅ is a crankcase portion 1 of the cylinder block body 1.
_It is cast around the _first to fifth bearing walls 13 _{1 to} 13 ₅ of _L.

After cooling the molten metal, as shown in FIG.
And the completed cylinder block B _C is taken out of the mold M. The jacket pin 45 and the gap form the water jacket 5 that opens to the deck surface 2.

As described above, the aluminum alloy cylinder block
Iron wet type cylinder lie that is cast around the main body 1
Nablock B_LIs the original function of the wet liner,
Increase the wear resistance of the cylinder bore where the piston slides
Besides, cylinder block B _CItself, especially its crank
Case part 1_LThe rigidity of the bearing wall 13 of the
It is possible to reduce the vibration and noise of the cylinder block.
Cylinder capable of reducing the thickness of the bearing wall 13
Block B_CContributes to downsizing, weight saving, and cost reduction
You can

Further, when the temperature of the cylinder block B _C is low such as when the engine is started, the clogging phenomenon of the crank shaft S _C due to the thermal contraction of the aluminum alloy cylinder block having a high coefficient of thermal expansion is reduced, and the crank shaft S _C rotates. The resistance is reduced, and in combination with the increased rigidity of the bearing wall, the engine performance is significantly improved.

Although the cylinder block is made of an aluminum alloy and the cylinder liner block is made of cast iron in the above-mentioned embodiment, they may be made of a combination of other materials. The rigidity of the material of the block may be higher than that of the cylinder block.

In the above embodiment, the cylinder liner block of the present invention is applied to a four cylinder cylinder block.
This can be applied to other multi-cylinder or single-cylinder cylinder blocks. Further, in the above-mentioned embodiment, the cylinder liner block of the present invention is of a four-wet type, but this is another multi-type or a single dry type. Of course, it can also be implemented.

[0032]

As described above, according to the present invention, the cylinder liner block is made of a material having rigidity higher than that of the main body, and the liner portion is cast around the cylinder barrel portion of the cylinder block main body. Since it is composed of a reinforcing wall part that is cast around the bearing wall of the crankcase part, the cylinder liner block not only has the original function of increasing the wear resistance of the cylinder of the cylinder block, but also significantly increases the rigidity of the bearing wall. It is possible to improve the engine performance by reducing vibration and noise of the cylinder block, and it is possible to reduce the thickness of the bearing wall of the crankcase part, thus reducing the size and weight of the cylinder block. It can also contribute to cost reduction.

[Brief description of drawings]

FIG. 1 is a plan view of a cylinder block.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is a front view of a cylinder liner block.

6 is a partial cross-sectional plan view taken along the line 6-6 of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is an end view taken along line 8-8 of FIG.

9 is a sectional view taken along the line 9-9 of FIG.

10 is a sectional view taken along the line 10-10 in FIG.

11 is a partially cross-sectional bottom view taken along the line 11-11 of FIG.

FIG. 12 is a view showing a process of casting a cylinder block with a mold.

FIG. 13 is a view showing a process of casting a cylinder block with a mold.

FIG. 14 is a view showing a process of casting a cylinder block with a mold.

[Explanation of symbols]

1 Cylinder block body 4 Liner part 13 Bearing wall 27 Reinforcement wall part 1 _U Upper part (cylinder barrel part) 1 _L Lower part (crank case part)

Claims (2)

[Claims] 1. A cylinder liner block that is cast in a cylinder block body (1) and is made of a material having rigidity higher than that of the cylinder block body (1). Of the cylinder barrel (1 _U ) of the crankcase (1 _L ) and the reinforcing wall (27) of the bearing wall (13) of the crankcase (1 _L ). Characteristic cylinder liner block for cylinder block. 2. The cylinder liner block for cylinder block according to claim 1, wherein the cylinder block body (1) is made of a light alloy, and the cylinder liner block (B _L ) is made of iron.