JP5359802B2 - Cylinder block with integrated timing case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylinder block integrated with a timing case, which can prevent the generation of shrinkage cavity due to wall thickening by opening a casting portion 5 in a wall body 4, provided between the cylinder block 1 and the timing case 2, which penetrates through the wall body 4. <P>SOLUTION: In the cylinder block integrated with the timing case in which the cylinder block 1 and the timing case 2 are integrally formed by casting, the casting portion 5 is opened in the wall body 4, provided between the cylinder block 1 and the timing case 2, which penetrates through the wall body 4. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a timing case integrated cylinder block in which a cylinder block and a timing case are integrally formed by casting.

  In general, a timing chain, a timing belt, and the like (hereinafter simply referred to as “timing chain”) for connecting and interlocking an engine crankshaft and camshaft are provided in front of the cylinder block. The timing chain is accommodated in a box-like (bag-like) timing case that opens upward.

  The timing case is formed separately from the cylinder block, but recently, a cylinder block formed by integrally forming the cylinder block and the timing case (hereinafter referred to as a “timing case integrated cylinder block”). ) Has been developed.

  Specifically, the timing case-integrated cylinder block is formed by integrally molding a box-shaped timing case, which is open upward and capable of accommodating the timing chain, at one end of the cylinder block (for example, a patent) References 1 and 2).

  Such a timing case-integrated cylinder block is preferable because it reduces the number of parts and simplifies the assembly work to improve productivity.

JP 2005-344699 A Japanese Utility Model Publication No. 7-17936

  However, in the conventional timing case-integrated cylinder block, there is a problem that shrinkage cavities are easily generated, causing internal leakage.

  That is, when the timing case integrated cylinder block is manufactured, for example, by die casting of aluminum alloy or the like, the timing case is formed by casting a molding die from above and below.

  However, in the structure of the conventional timing case-integrated cylinder block, a wall provided between the cylinder block and the timing case, specifically, a lower portion of the female screw hole formed in the cylinder head block. A thick wall portion such as an aluminum alloy is formed on the nearby wall body.

  Therefore, in the conventional timing case-integrated cylinder block, the weight cannot be reduced and the shrinkage can easily be generated. For example, from the main oil hole provided near the lower portion of the female screw hole to another part. There is a problem that internal leakage is likely to occur, such as oil leakage.

  However, if the timing case and the cylinder block are conventional cylinder blocks formed separately, in order to reduce the shrinkage cavity, the cylinder block is located below the female screw hole of the head bolt of the first journal. It is possible to prevent the thick wall by casting with a molding die from the front.

  However, in the timing case-integrated cylinder block, because of the structure, the timing case integrally molded in front of the cylinder block is in the way, and it cannot be cast with a molding die from the front of the cylinder block. The thick wall cannot be prevented.

  The present invention aims to solve such a problem, and by forming a cast-out portion that penetrates the wall body in the wall body provided between the cylinder block and the timing case, the shrinkage nest due to the thick wall is provided. Provided is a timing case-integrated cylinder block capable of preventing the occurrence of the above.

To solve the above problem,
The present invention provides a timing case-integrated cylinder block in which a cylinder block and a timing case are integrally formed by casting, and the wall provided between the cylinder block and the timing case includes the wall It is characterized in that a cast-out part penetrating the body is established.

  In other words, in the present invention, the wall provided between the cylinder block and the timing case is substantially perpendicular to the direction in which the cylinders are arranged (the axial direction of the camshaft) (hereinafter referred to as “the left-right direction of the wall”). By opening a cast-out part that penetrates toward the surface, the thick-walled part can be removed to prevent shrinkage and internal leakage.

  Moreover, the said cast-out part should just be a through-hole penetrated in the left-right direction of the said wall, and is not limited to the shape and magnitude | size.

However, the cast-out part is opened at a position where it is difficult to cast from the front or the upper side of the cylinder block, specifically, below the bottom of the female screw hole formed in the upper surface of the cylinder block. It is desirable to become.

  Furthermore, since the said cast-out part is penetrated in the left-right direction of the said wall body, it is also possible to use the said cast-out part as a channel | path of gas, a liquid, or a fluid.

  For example, the cooling effect of the timing case-integrated cylinder block in contact with the cored portion can be enhanced by circulating a refrigerant such as air, water, or oil from one side of the cored portion to the other.

  Therefore, if the cast-out part is also used as a cooling passage, there is no need to separately form a cooling pipe or the like on the cylinder block, and the structure of the timing case integrated cylinder block is reduced in size. Can also reduce the fuel consumption of the vehicle.

  In particular, in the case where cooling water is circulated as the refrigerant, one of the punched portions is a cooling water inlet from a water pump, and the other is cooling water for supplying cooling water other than the head block to the necessary parts. It can also be used as an inlet.

  Therefore, the present invention is characterized in that a water jacket through which cooling water flows is connected to the wall around the cylinder, and the water jacket and the cast-out part are connected.

  That is, in the case of a timing case-integrated cylinder block in which a water jacket is formed on the wall around the cylinder, the front portion of the water jacket is formed, for example, at the bottom, and the water jacket and the casting are formed. The extraction part can be communicated.

  Therefore, if the cooling water is supplied from one of the punched portions, water can be supplied to the water jacket communicated with the cast portion, and the water inlet for the water jacket is connected to the cylinder block. The timing case integrated cylinder block can be further reduced in size, and the fuel consumption of the vehicle can be reduced.

  In the case of this timing case-integrated cylinder block, the cooling water is circulated from one of the cast parts to the other, but the cast part has a longitudinal direction of the cast part. It is preferable to form a wall surface for directing a part of the flowing cooling water to the water jacket.

  As this wall surface, for example, a wall surface such as a stepped portion, a corner portion, or a bulging portion is formed on the inner wall of the cast portion so as to obstruct the flow of the cooling water in the middle of the cast portion. By this, it means what changes the flow of the cooling water in a part of the direction.

  According to the timing case-integrated cylinder block of the present invention, it is possible to prevent the occurrence of shrinkage by eliminating the thick portion formed on the wall.

1 is an overall perspective view showing an embodiment of a timing case integrated cylinder block A. FIG. It is an expanded sectional view of the principal part cut | disconnected by the aa line of FIG. It is an expanded sectional view of the principal part cut | disconnected by the bb line | wire of FIG. It is an expanded sectional view of the principal part cut | disconnected by the cc line | wire of FIG. It is the whole perspective view which showed other embodiment of the timing case integrated cylinder block A. It is an expanded sectional view of the principal part cut | disconnected by the aa line of FIG. It is an expanded sectional view of the principal part cut | disconnected by the cc line of FIG. (A)-(c) is explanatory drawing which outlined the flow of the cooling water W in the timing case integrated cylinder block A shown in FIGS.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall perspective view showing an embodiment of a cylinder block A integrated with a timing case.

  2 to 4 are enlarged cross-sectional views of the main part in FIG. 1, FIG. 2 is an enlarged cross-sectional view of the main part taken along line aa in FIG. 1, and FIG. FIG. 4 shows an enlarged cross-sectional view of the main part cut along the line cc in FIG. 1, respectively.

  In addition, the same code | symbol is attached | subjected to the site | part which is common in FIGS. 1-4, and the overlapping description is abbreviate | omitted.

  The timing case integrated cylinder block A of the present embodiment is formed by integrally molding a timing case 2 on the front side of the cylinder block 1 by die casting.

  The cylinder block 1 is provided with a plurality of cylinders 11 penetrating in a columnar shape with a predetermined interval in the front-rear direction, wall bodies 1a are formed in front and rear of the cylinder block 1, and wall bodies 1b in the left-right direction. Formed.

  Here, as shown in FIG. 1, the front-rear direction means a direction in which the cylinder 11 is disposed (an axial direction of a crankshaft not shown), and the left-right direction means a direction orthogonal to the front-rear direction. doing.

  Further, the wall jackets 1a and 1b around the cylinder 11 are continuously provided with a water jacket 12 through which cooling water flows so as to cover the circumference of the cylinder 11.

  The water jacket 12 is formed in a groove shape opened upward, and is superposed on a groove (not shown) formed below a cylinder head (not shown) placed on the cylinder block 1. It is formed in a hollow shape.

  A cooling water inlet 12a that can communicate with the water jacket 12 is opened in the left wall 1b of the cylinder 11 (the first cylinder) arranged in the forefront, and a water pump (not connected) is connected to the cooling water inlet 12a. Cooling water is supplied to the water jacket 12 through the figure) to cool the cylinder block 1.

  Further, a plurality of female screw holes 13 for head bolts (not shown) are formed at appropriate positions on the upper surface of the cylinder block 1, and the female bolts of the cylinder block 1 are inserted through the head bolts from the upper surface of the cylinder head. The cylinder head is fastened and fixed to the cylinder block 1 by being screwed into the hole 13.

  The cylinder block 1 has a skirt wall portion 3 extending downward from the wall bodies 1a and 1b. The lower portion of the skirt wall portion 3 is closed by an oil pan (not shown), and the crank block is placed inside the skirt wall portion. A space for accommodating (not shown) is formed.

  The timing case 2 is surrounded by vertical walls 21 at least on four sides, and a chain housing chamber 22 in which a timing chain is housed is formed.

  Of the vertical walls 21 provided on the four sides of the timing case 2, the vertical wall 21 a positioned on the rear side and the wall body 1 a positioned on the front side of the cylinder block 1 are shared. A wall 4 is formed by both walls 1a and 21a.

  As described above, in the timing case integrated cylinder block A, the wall 4 is formed between the cylinder block 1 and the timing case 2, but a thick portion is formed on the wall 4, and the shrinkage nest is formed. Is likely to occur.

  Therefore, in the timing case-integrated cylinder block A of the present embodiment, the wall body 4 provided between the cylinder block 1 and the timing case 2, specifically, is more substantially than the female screw hole 13 of the cylinder block 1. In the lower part, a cast-out part 5 penetrating in the left-right direction of the wall 4 is opened.

  The cast-out portion 5 may be penetrated in the left-right direction of the wall body 4. For example, when the wall body 4 has the main oil hole 15 extending to the cylinder block 1 or the breathing hole 16, FIG. As shown in FIG. 5, the cast-out part 5 may be opened while avoiding the main oil hole 15 and the breathing hole 16.

  In addition, the casting part 5 can be formed by previously forming a molding die having the same shape as the casting part 5 into two parts and casting each molding die from the left and right wall bodies 1b.

  In such a timing case-integrated cylinder block A, a wall 5 provided between the cylinder block 1 and the timing case 2 is provided with a cast portion 5 penetrating in the left-right direction. By removing the thick part formed on the wall 4, it is possible to prevent the occurrence of the shrinkage nest and internal leakage.

  Moreover, since the cast-out part 5 is penetrated in the left-right direction of the wall body 4, it becomes possible to use the cast-out part 5 as a cooling passage.

  For example, a timing case-integrated cylinder block A that is in contact with the cored portion 5 by circulating a refrigerant such as air, water, or oil from the one open end 5a of the casted portion 5 toward the other open end 5b. The cooling effect can be enhanced.

  Therefore, if the cast-out portion 5 is also used as a cooling passage, there is no need to form a separate cooling pipe or the like on the cylinder block 1 separately, and the timing case integrated cylinder block A is not required. The structure can be made smaller and the fuel consumption of the vehicle can be reduced.

  FIG. 5 is an overall perspective view showing another embodiment of the timing case-integrated cylinder block A, FIG. 6 is an enlarged cross-sectional view of the main part cut along the line aa in FIG. 5, and FIG. It is an expanded sectional view of the principal part cut | disconnected by the cc line of FIG.

  In addition, the same code | symbol is attached | subjected to the site | part which is common in FIGS. 1-4, and the overlapping description is abbreviate | omitted and below, only the characteristic of this embodiment is demonstrated.

  The timing case integrated cylinder block A of the present embodiment is characterized in that the water jacket 12 formed around the cylinder 11 and the cast-out portion 5 are communicated with each other.

  That is, in the timing case integrated cylinder block A shown in FIGS. 1 to 4, the bottom wall 12 b of the water jacket 12 formed in front of the cylinder (first cylinder) 11 disposed at the forefront, However, it was divided and formed as shown in FIG.

  However, in the timing case integrated cylinder block A of the present embodiment, as shown in FIG. 7, the bottom wall (12b) of the water jacket 12 is formed deeper so that the water jacket 12 and the cast-out portion 5 are formed. And is communicated.

  Therefore, in the timing case-integrated cylinder block A of the present embodiment, if the cooling water W is supplied from one open end 5a of the cast-out part 5, the cooling water W communicates with the cast-out part 5 as described above. The water jacket 12 can also be supplied to the water jacket 12 to supply water.

  Therefore, in the timing case integrated cylinder block A of the present embodiment, it is not necessary to form the cooling water inlets (12a) to the water jacket 12 one by one as shown in FIG. Furthermore, the size can be reduced and the fuel consumption of the vehicle can be reduced.

  Moreover, it is preferable to form a wall surface 51 for directing a part of the flow of the cooling water W flowing in the longitudinal direction of the cast part 5 toward the water jacket 12 in the cast part 5.

  That is, the cooling water W supplied from one open end 5a of the cast-out part 5 flows toward the other open end 5b of the cast-out part 5, and the cooling water flowing through the cast-out part 5 It is preferable to form the wall surface 51 so that W flows smoothly toward the water jacket 12 side.

  As such a wall surface 51, for example, as shown in FIG. 6, a step portion that becomes an obstacle to the flow of the cooling water W is formed in a substantially intermediate portion of the cast-out portion 5, thereby the vicinity of the wall surface 51. By changing the flow of the cooling water W, a part of the cooling water W can be smoothly supplied toward the water jacket 12.

  Here, FIGS. 8A to 8C are explanatory views outlining the flow of the cooling water W in the timing case-integrated cylinder block A shown in FIGS.

  That is, if the cooling water W is supplied from one open end 5a of the cast-out part 5 as described above, the cooling water W is supplied to the water jacket 12 from the lower front side of the water jacket 12, and a new flow path is provided. Can be formed.

  For example, as shown in FIG. 8A, the cooling water W supplied from the front lower side of the water jacket 12 circulates behind the cylinder block 1 and also circulates behind the cylinder head through the cylinder head. Yes (both head and block are longitudinal).

  Further, as shown in FIG. 8B, the cooling water W supplied from the front lower side of the water jacket 12 circulates behind the cylinder block 1 and passes from the left side to the right side of the cylinder head through the cylinder head. Can also be distributed (the head is cross-flowed and the block is vertical).

  Alternatively, as shown in FIG. 8C, the cooling water W supplied from the front lower side of the water jacket 12 circulates behind the cylinder block 1 and passes from the right side to the left side of the cylinder head through the cylinder head. Can also be distributed (the head is cross-flowed and the block is vertical).

  Here, the “longitudinal flow” means that the cooling water W flows in the front-rear direction of the cylinder block 1 shown in FIG. 5, and the “lateral flow” means that the cooling water W is flown in FIG. It means flowing in the left-right direction of the cylinder block 1 shown.

  Further, the flow of the cooling water W flowing through the water jacket 12 can be easily regulated by providing the partition 6 in the water jacket 12.

  Thus, in the timing case-integrated cylinder block A of the present embodiment, different flows of the cooling water W (the head and the block are both longitudinally flowed) and (the head is laterally flowed and the block is vertically flowed), which were not possible with the conventional structure. Can be easily achieved without changing the basic structure of the timing case-integrated cylinder block A by simply providing the partition 6 in place.

A Timing Case Integrated Cylinder Block 1 Cylinder Block 11 Cylinder 1b Left Right Wall 12 Water Jacket 13 Female Screw Hole 2 Timing Case 4 Wall 5 Casting Part

Claims (3)

In the timing case-integrated cylinder block formed by integrally molding the cylinder block and the timing case by casting,
The wall provided between the cylinder block and the timing case is provided with a cast portion that penetrates the wall ,
The wall around the cylinder is connected to a water jacket through which cooling water flows.
The timing case-integrated cylinder block, wherein the water jacket and the cast-out part are communicated with each other. In the timing case integrated cylinder block according to claim 1,
The timing case-integrated cylinder block is characterized in that the cast-out portion is provided below the bottom of the female screw hole provided in the upper surface of the cylinder block. In the timing case integrated cylinder block according to claim 1 ,
A timing case-integrated cylinder block, wherein a wall surface for directing a part of a flow of cooling water flowing in a longitudinal direction of the cast portion to a water jacket is formed in the cast portion .

Images