JPH05187310A - Cylinder block of multicylinder engine and casting device thereof - Google Patents

Abstract

PURPOSE:To prevent oil from leaking from an oil gallery to a cylinder block outside by providing a distributing passage on a crank case metal mold, cast punch-forming by a pin shaped jig and a supporting jig, and installing an oil jet on the distributing passage. CONSTITUTION:A cast-punching hole by which an oil gallery 7 extending in crank shaft direction is formed, is formed by a pin shaped jig 17 for forming the cast-punching hole, and an oil passage is provided to communicate from the cast-punching hole to an oil jet 13 through a distributing passage 11. The distributing passage 11 is provided in a crank case metal mold for forming the inner wall of a crank case. The pin shaped jig 17 is cast-punching-formed by a supporting jig 18 for supporting at least one position. The oil jet 3 is installed to the distributing passage 11 to inject oil inside a cylinder 6. It is thus possible to form a cylinder block which allows no oil leakage from the oil gallery 7 to the outside of the cylinder block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder block for a multi-cylinder engine and a casting apparatus therefor.

[0002]

2. Description of the Related Art It is generally known that, in a cylinder block of a multi-cylinder engine, there is a method for forming an oil gallery extending in the crankshaft direction by using a pin-shaped jig for forming a casting hole. ing. Further, as seen in JP-A-1-315648, in a V-shaped engine, a pin jig for forming a casting hole is supported by a supporting jig from above so that the pin jig does not fall down by the pressure applied during pouring. It is disclosed.

[0003]

However, as disclosed in Japanese Patent Application Laid-Open No. 1-315648, in a cylinder block of a V-shaped engine, casting by a supporting jig that supports a pin-shaped jig for forming a casting hole is performed. There is a risk that oil leakage to the outside of the cylinder block may occur due to lack of sealing at this portion because a vent hole is formed in the upper surface between V banks.

Further, when the cylinder liner is cast, the liner is displaced in the direction of the crank axis, and the dimension between the bores is not set to a predetermined value. Therefore, it is necessary to make a large tolerance between the dimensions of the bores. There was a problem that became large.

Therefore, an object of the present invention is to solve such a problem, so that there is no oil leakage from the oil gallery to the outside of the cylinder block, and the dimensional accuracy is such that the interbore dimension is set to a predetermined value. It is an object of the present invention to provide a good and compact cylinder block and a casting apparatus for forming the cylinder block.

[0006]

In order to achieve the above object, the constitution of the present invention is as follows.

According to the first aspect of the present invention, the casting hole for the oil gallery extending in the crankshaft direction is formed by a pin jig for forming the casting hole, and the casting hole for the oil gallery is passed through the distribution passage. , A cylinder block of a multi-cylinder engine of the present invention having an oil passage communicating with an oil jet,

The distribution passage is formed by casting with a supporting jig which is provided in a crankcase mold for forming the inner wall of the crankcase and which supports the pin-shaped jig at least at one place. The oil jet that ejects oil toward the inside of the cylinder is attached.

According to the second aspect, a mold for holding the cylinder liner and forming a cavity for casting the cylinder block, and a casting hole for an oil gallery extending in the crankshaft direction are formed. A casting device of the present invention for forming a cylinder block of a multi-cylinder engine having an oil passage communicating with an oil jet from a casting hole for an oil gallery, which comprises a pin jig for forming a casting hole,

A supporting jig that supports the pin-shaped jig supported in a cantilever manner in the cavity, and casts and forms at least one distribution passage to which an oil jet for ejecting oil toward the cylinder is attached. Is provided in the crankcase mold forming the inner wall of the crankcase, and fits with the notch at the lower end of the cylinder liner, and a convex portion interposed between the cylinder liner and the supporting jig is provided near the supporting jig. It is configured to be installed in the crankcase mold of.

According to the third aspect of the present invention, the V provided with the oil gallery casting holes in the central portions of the left and right banks.
The casting apparatus of the present invention for casting and molding a cylinder block of a mold engine,

A crankcase is provided with a supporting jig for casting and forming the distribution passage between which the oil jets are mounted between the adjacent cylinder liners of the left and right banks, and the convex portion which fits into the cutouts at the lower ends of both cylinder liners. It is configured so as to be provided in a mold for use.

[0013]

According to the first aspect of the present invention, the distribution formed by casting is performed by the supporting jig that supports the pin-shaped jig for forming the casting hole for forming the casting hole for the oil gallery. Since the passage opens to the crank chamber side, it is possible to form a cylinder block that does not leak oil from the oil gallery to the outside of the cylinder block. You can save the trouble of processing and forming the hole to attach the jet with a drill.

According to the second aspect of the present invention, by providing the support jig for supporting the pin-shaped jig for forming the casting hole, the support rigidity of the pin-shaped jig during casting is improved, and the pin-shaped jig is improved. The jig can be formed thin, and a compact cylinder block can be formed in the height direction.

By providing a supporting jig for supporting the pin-shaped jig in the crankcase mold, the cavity between the cylinder liner and the supporting jig is narrowed,
Since there is a possibility that the molten metal surroundings during casting may deteriorate, in the present invention, in the vicinity of the support jig, the cutout portion of the cylinder liner is fitted, and between the cylinder liner and the support jig. It is possible to improve the running performance of the molten metal in this portion by reducing the thin portion between the cylinder liner and the supporting jig as much as possible. At the same time, since the cylinder liner is positioned, the displacement of the cylinder liner in the crank axis direction can be limited, and the dimension between the bores can be set to a predetermined value, and a cylinder block with good dimensional accuracy can be formed. ..

According to the third aspect of the invention, when the cylinder block of the V-type engine is cast-molded, the cavity between the supporting jig and the cylinder liner is formed at an acute angle. Is likely to occur, and by providing the above-mentioned convex portion, it is possible to prevent the deterioration of the bathing area, and at the same time, to position the cylinder liner.

[0017]

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

FIG. 1 is a sectional front view of a V-type engine, FIG. 2 is a central vertical sectional view taken along the line II-II of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIG. 4 is a vertical sectional view of a crankcase forming die. Fig. 5 is a sectional front view taken along line IV-IV of Fig. 4, Fig. 6 is a diagram in which a pin jig for forming a casting hole and a supporting jig are engaged, and Fig. 7 is a cut formed on a cylinder liner. It is a figure of a notch. First, the cylinder block of the V-type engine of the present invention will be described in detail.

Cylinder block 1 of V type engine E
Is provided with a right bank 3 and a left bank 4 which are connected at a predetermined angle above a crankcase portion 2 which accommodates a lower crankshaft (not shown). Cylinder portions 6 forming a cylinder bore 5 in which a cylinder liner 10 into which (not shown) is slidably inserted are cast are installed in three cylinders each.

Further, an oil gallery 7 extending in the crankshaft direction to which oil is supplied from an oil pump (not shown) is formed in the central portion of both banks 3 and 4. An oil passage 9 communicates with the journal portion 8 supporting the shaft from below and is lubricated.

The oil gallery 7 is formed by taper-casting from one end to the other end of the cylinder block 1, and supports a pin-shaped jig 17 described below and the pin-shaped jig 17 from below. It is formed using the support jig 18.

Further, between the adjacent cylinder bores 5 of the left and right banks of the cylinder block 1, a distribution jig 11 opened to the crank chamber side by a supporting jig 18 described later.
Is formed by casting. After that, in this distribution path 11,
An oil jet 13 that is threaded and ejects oil into each of the adjacent cylinder bores 5 of the left and right banks to cool the inside of the cylinder includes a washer 29 and a bolt 28.
Mounted by. At this time, oil jet 1
3 is attached so as to fit into a cutout portion 27 formed in the cylinder liner 10.

In the cylinder block 1 of the V-type 6-cylinder engine of this embodiment, three oil jets 13 are required to inject oil into the adjacent cylinder bores 5 of the left and right banks. The distribution passages 11 to which the oil jets 13 are attached are formed by casting in three places, but the distribution passages 11 do not necessarily have to be formed in three places, and may be formed in a small number. In that case, the distribution passage 11 may be processed and formed by a drill or the like so that three oil jets can be provided after casting. However, it is best to form the distribution passages 11 by casting in three places from the viewpoint of eliminating the work of forming the holes with a drill or the like.

Therefore, in the case of an in-line engine, the distribution passages are formed by casting in the same number as the number of oil jets corresponding to the number of cylinders, and in the case of a V-type multi-cylinder engine, in each of the adjacent cylinder bores of the left and right banks. In order to attach the oil jets so that the oil can be jetted into the pipes, it is best to form the distribution channels by casting as many as the required number of oil jets.

Further, as described above, as the cylinder block 1 is formed by die casting, the cooling water passage 14 (water jacket) on the outer periphery of the cylinder portion 6 is also formed by casting, so that the water The upper end of the jacket 14 is formed as an open deck type opening to the deck surface 1 a of the cylinder block 1.

Further, in FIG. 2, a water jacket housing 15 which is an inlet of cooling water to a water pump (not shown) is formed at a front end portion between the V banks 3 and 4, and an oil gallery 7 is formed up to the front end portion. Therefore, the lubricating oil is supplied to the journal portion 8 at the front end from the sub gallery 16 (see FIG. 1) formed on the side of the one right bank 3.

Further, cylinder heads (not shown) are fastened above the banks 3 and 4 of the cylinder block 1, respectively. An intake manifold or the like for supplying intake air to the cylinder will be provided.

According to the above-described embodiment, since the distribution passage 11 formed by the supporting jig 18 supporting the pin-shaped jig 17 is open to the crank chamber side, the oil gallery 7 is connected to the outside of the cylinder block. It is possible to provide a cylinder block that does not leak oil.

At the same time, since the oil jet 13 is attached using the distribution passage 11, the oil jet 13
You can save the trouble of processing and forming the hole to attach with a drill. Next, the casting apparatus for the cylinder block of the V-type engine of the present invention will be described in detail.

A molding die A which forms a cylinder block of a V-shaped engine holds a cylinder liner and a bore core 31 which forms a cylinder bore, a water jacket core 32 which forms a water jacket, and an upper surface between V banks. Of the present invention. The upper die 33 that forms the side surface of the cylinder block, the horizontal die 34 that forms the side surface of the cylinder block, the end surface die (not shown) that forms the front and rear end surfaces of the cylinder block, and the crankcase die 12 that forms the inner wall of the crankcase. The crankcase mold 12 is provided with a crankcase part forming mold part 19 forming a crankcase part 2 which is a chamber in which a counterweight (not shown) provided on the crankshaft rotates, and an oil jet 13. It is composed of a columnar support jig 18 that forms the distribution path 11. The supporting jig 18 is provided on the upper part of the crankcase part forming mold part 19, and as shown in FIG. Is provided with a gap 25.

The supporting jig 18 is the pin-shaped jig 1.
A through hole 20 into which 7 is inserted is provided, and a pin-shaped jig 17 cantilevered by a rear end face mold is supported from below in a cavity 30 formed by a molding die A. The jig 17 slides in the crankshaft direction at the same time as the rear end face type and is inserted into the through hole 20, and the pin jig 17 and the support jig 18 engage with each other as shown in FIG. To be done.

Further, the above-mentioned crankcase part forming mold part 1
9 is provided with an inclined portion 21 inclined in a direction perpendicular to the central axis direction of each bank 3, 4, and the upper surface of the inclined portion 21 is fitted with the convex portion 23 of the bore core 31 forming the cylinder bore 5. The cylinder liner is provided with a concave portion 24 which fits with the cutout portion 27 (see FIG. 7) formed at the lower end of the cylinder liner at the boundary between the inclined portion 21 and the supporting jig 18. A convex portion 22 is provided between the support jig 17 and the supporting jig 17.

In order to form a cylinder block with the molding die A, molten metal is poured into the cavity 30 formed by the molding die A in a state where the molding die A is clamped. To do. After that, first, the pin-shaped jig 17 is pulled out in the crankshaft direction at the same time as the rear end face mold, and the engagement with the support jig 18 is released, and then the other molds are unfastened to remove the cylinder block. Take it out.

According to the above-mentioned embodiment, the supporting jig 18 for supporting the pin gallery 17 for forming the oil gallery.
By providing three points, the supporting rigidity of the pin-shaped jig 17 at the time of casting is improved, the pin-shaped jig 17 can be formed thin, and the cylinder block can be made compact in the height direction. it can.

Further, by providing the convex portion 22, the thin portion between the supporting jig 18 and the cylinder liner 10 can be eliminated as much as possible, and during casting, the running property of the molten metal is improved. be able to.

As a result, a sufficient wall thickness is secured between the support jig 18 and the cylinder liner 10, and the cylinder block of the V-shaped engine formed by the casting apparatus of this embodiment has a sufficient thickness. It becomes a rigid cylinder block.

At the same time, since the convex portion 22 is fitted with the cutout portion 27 formed at the lower end of the cylinder liner, the displacement of the cylinder liner in the crankshaft direction can be restricted, and the bore can be restricted. The space dimension can be set to a required minimum predetermined value, the dimension accuracy is high, and a compact cylinder block can be formed in the crankshaft direction.

In this embodiment, an example of the molding die forming the cylinder block of the V-type engine has been shown, but the molding die of the present invention should be used when forming the cylinder block of the in-line engine. Is also possible.

Further, in the present embodiment, an example in which the supporting jigs 18 are provided at three places is shown, but it is also possible to provide the supporting jigs 18 at least at only one place.
It is preferable that the support jig 18 supports a portion of the pin-shaped jig 17 that is cantilevered in the zero position as far away as possible from the fulcrum.

However, from the viewpoint of improving the support rigidity during casting of the pin-shaped jig 17, the support jig 18 is used.
Is preferably provided as much as possible. In the case of a casting device for forming a cylinder block of an in-line engine, the supporting jigs 18 are provided in the same number as the oil jets corresponding to the number of cylinders of the engine, and the cylinders of the V-type multi-cylinder engine are In the case of a casting device that forms blocks, in order to install oil jets so that oil can be jetted into the adjacent cylinder bores of the left and right banks, as many supporting jigs 18 as the number of oil jets are required. Is best provided.

[Brief description of drawings]

FIG. 1 is a sectional front view of a V-type engine.

FIG. 2 is a vertical cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a central vertical cross-sectional view of a crankcase forming die.

5 is a sectional front view taken along line IV-IV of FIG.

FIG. 6 is a view in which a pin-shaped jig for forming a casting hole and a support jig are engaged with each other.

FIG. 7 is a view of a cutout portion formed in a cylinder liner.

[Explanation of symbols]

Cylinder block ... 1, right bank ... 3, left bank ...
4, cylinder part 6, oil gallery 7, cylinder liner 10, distribution channel 11, crankcase mold 12, oil jet 13, pin jig 1
7, support jig 18, mold part for forming crankcase part 1
9. Cylinder liner positioning projections ... 22.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area F02F 1/00 K 8503-3G

Claims (3)

[Claims] 1. An oil passage for forming an oil gallery casting hole extending in the crankshaft direction by means of a casting hole forming pin jig, and communicating with an oil jet from the oil gallery casting hole through a distribution passage. In a cylinder block of a multi-cylinder engine, the distribution passage is provided in a crankcase mold that forms an inner wall of the crankcase, and is cast by a supporting jig that supports at least one of the pin jigs. A cylinder block for a multi-cylinder engine, characterized in that an oil jet for ejecting oil toward the inside of the cylinder is attached to the distribution passage. 2. A molding die for holding a cylinder liner and forming a cavity for casting a cylinder block, and a pin-shaped jig for forming a casting hole for forming a casting hole for an oil gallery extending in the crankshaft direction. In a casting device for a cylinder block of a multi-cylinder engine having an oil passage communicating with an oil jet from a casting hole for an oil gallery, the pin-shaped jig cantilevered in a cavity. A crankcase die forming the inner wall of the crankcase is provided with a supporting jig that supports the above and also forms the at least one distribution passage by casting through which the oil jet for ejecting oil toward the cylinder is attached. , Fits into the notch on the bottom of the cylinder liner, and intervenes between the cylinder liner and the support jig. A casting device for a cylinder block of a multi-cylinder engine, wherein a convex portion is provided on a crankcase mold near the supporting jig. 3. The molding die is for molding a cylinder block of a V type engine having the oil gallery casting holes in the central portions of the left and right banks, and
The crankcase includes a support jig for casting and forming the distribution passage between which the oil jets are mounted between the adjacent cylinder liners of the left and right banks of the cylinder block, and the convex portion that fits into the cutouts at the lower ends of both cylinder liners. The casting device for a cylinder block of a multi-cylinder engine according to claim 2, wherein the casting device is provided in a metal mold.