JP2016059946A - Core pin and core pin device, and casting apparatus equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of easily securing cooling performance of a core pin even when the core pins are arranged in a crossing manner to each other.SOLUTION: A core pin assembly 20 includes a core pin 22, a pipe member 24, and an intermediate passage component 26. The core pin 22 has a shaft center hole 32a formed along a shaft center line, and side holes 32b, 32c formed along a direction parallel with the shaft center line, on both sides of a penetration hole 25 formed on a holding part 22b. The pipe member 24 is arranged inside a pin part-side center hole 34b so as to form a double tube structure with a pin part inner hole 34b1. Further, among the intermediate passage component 26, pipe members 52, 54 that form a double tube structure are arranged inside a base end part-side shaft center hole 34a. By this structure, other core pin 42 can be inserted through the core pin assembly in a crossing manner, and cooling water can be supplied to the tip end of a pin part 22a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cast pin and a cast pin device that are installed in a mold and configured to form a hole in a cast product, and a casting device including the same.

  Japanese Patent Application Laid-Open No. 2004-19513 (Patent Document 1) discloses a technique of forming a bolt hole for fastening a bearing cap and a lubrication hole for crankshaft bearing lubrication using a cast pin in a cast cylinder block. Is disclosed.

  With the above-described technique, it is possible to reduce the machining allowance and the material weight as compared with the case of forming holes (holes) by machining, and it is possible to improve the casting quality.

  By the way, since the core pin is directly immersed in a high-temperature molten metal, a technology for improving the durability of the core pin itself and a technology for suppressing the occurrence of solidification shrinkage nests have been proposed. From this point of view, the applicant has also proposed a technique for circulating cooling water inside the core pin (Patent Document 2).

JP 2004-19513 A Japanese Patent Laid-Open No. 9-1313

  However, in the technique disclosed in Patent Document 1, since the bolt hole and the lubrication hole are arranged so that the axial center lines of the bolt hole and the lubrication hole intersect each other, each hole (hole) is formed. Therefore, it is necessary to arrange the cast pins for crossing each other. When the core pins are arranged in an intersecting manner, the core pins must be configured so that the core pins do not collide with each other. The shape of the passage for circulating the cooling water inside the extraction pin is also complicated.

  The present invention has been made in view of the above, and an object of the present invention is to provide a technique capable of easily ensuring the cooling performance of the core pins even when the core pins are arranged in an intersecting manner. To do.

  The cast pin and the cast pin device of the present invention and the cast device provided with the same take the following means in order to achieve the above-mentioned object.

  According to a preferred embodiment of the cast pin according to the present invention, a cast pin that is installed in a mold and forms a hole in a cast product is configured. The cast pin includes a pin portion and a main body portion. The pin portion is configured to protrude into the mold cavity. The main body portion is configured to extend along the major axis direction of the pin portion from one end portion in the major axis direction of the pin portion in a direction opposite to the extending direction of the pin portion. A cooling passage extending in the major axis direction of the pin portion is provided inside the pin portion. In addition, a through-hole penetrating in the direction intersecting with the extending direction of the main body portion is formed in the main body portion, and the main body portion extends in the major axis direction on both sides of the through hole. First and second passages, and first and second communication passages that connect the cooling passage and the first and second passages are provided. The cooling water supplied from the cooling water supply source is supplied from one of the first passage and the second passage to the cooling passage through one of the first communication passage and the second communication passage, and is supplied to the cooling passage. The cooled water is recirculated from the other of the first communication path and the second communication path to the cooling water supply source via the other of the first path and the second path.

  According to the present invention, the core pins can be arranged in an intersecting manner with a simple configuration in which the other core pins are inserted through the through holes formed in the main body portion. In addition, cooling of the core pins arranged in a crossing manner with a simple configuration in which the first and second passages are provided in the main body portion while avoiding the through holes and the first and second passages are only communicated with the cooling passages. Sex can be secured.

  According to the further form of the core pin which concerns on this invention, a main-body part seems to be connected to a cooling passage via a through-hole from the base end part on the opposite side to the front-end | tip part by which the pin part was connected. It has a shaft center hole drilled in. The shaft center hole includes a first shaft center hole disposed near the base end portion with the through hole interposed therebetween, and a second shaft center hole disposed near the distal end portion sandwiching the through hole. Further, the first shaft center hole and the second shaft center hole are configured such that the opening on the through hole side is closed. Furthermore, the 1st and 2nd channel | path is drilled over predetermined length from the base end part. The cooling water supplied to one of the first passage and the second passage is configured to be supplied to the cooling passage via one of the first communication passage, the second shaft center hole, and the second communication passage. The cooling water supplied to the cooling passage is supplied to the other of the first passage and the second passage through the other of the first communication passage, the second shaft center hole, and the second communication passage.

  According to this embodiment, the shaft center hole and the first and second passages are drilled from the base end side of the main body, and the second shaft center hole and the first and second passages are first and second connected. While communicating with the passage and only closing unnecessary openings, it is possible to easily secure the cooling water passage inside the core pins arranged in an intersecting manner.

  According to the further form of the core pin which concerns on this invention, a main-body part seems to be connected to a cooling passage via a through-hole from the base end part on the opposite side to the front-end | tip part by which the pin part was connected. It has a shaft center hole drilled in. The shaft center hole includes a first shaft center hole disposed near the base end portion with the through hole interposed therebetween, and a second shaft center hole disposed near the distal end portion sandwiching the through hole. Further, the first shaft center hole and the second shaft center hole are configured such that the opening on the through hole side is closed. Further, the first and second passages are configured so as to be perforated over a predetermined length from the base end portion and to close the base end side. In addition, third and fourth communication passages that communicate the first shaft center hole with the first and second passages are further provided inside the main body. The cooling water supplied from the cooling water supply source is configured to be supplied to one of the first passage and the second passage through one of the first shaft center hole, the third communication passage, and the fourth communication passage. The cooling water supplied from the cooling passage to the other of the first passage and the second passage is returned to the cooling water supply source via the first shaft center hole, the third communication passage, and the other of the fourth communication passage. It is configured.

  According to this embodiment, the shaft center hole and the first and second passages are formed from the base end side of the main body, and the first shaft center hole and the first and second passages are connected to the third and fourth stations. While communicating with the passage and only closing unnecessary openings, it is possible to easily secure the cooling water passage inside the core pins arranged in an intersecting manner.

  According to the further form of the core pin which concerns on this invention, the main-body part has a cross-sectional shape perpendicular | vertical with respect to the major axis direction of a pin part to a longitudinal direction in the arrangement direction of a 1st channel | path, a through-hole, and a 2nd channel | path. It is comprised in the flat shape which has. The “flat shape” in the present invention is defined as a state in which the length in the vertical direction in the cross section is smaller than the length in the horizontal direction. For example, an elliptical shape, a rectangular shape, and an oval shape correspond to this. Here, the “oval shape” corresponds to a shape in which two circles having the same radius are connected by a common outer tangent.

  According to this form, internal passages, such as the 1st and 2nd passages, can be secured, controlling that a cast pin itself enlarges. Moreover, the change scale of the mold in which the core pin is installed can be suppressed to be small.

  According to a preferred embodiment of the cast pin device according to the present invention, a cast pin device that is installed in a mold and forms a hole in a cast product is configured. The cast pin device includes the cast pin according to the present invention according to any one of the above-described aspects, a reflux passage constituting member, and a passage constituting member. The recirculation passage component is configured to supply the cooling water supplied from the cooling water supply source to one of the first passage and the second passage, and from the cooling passage to the other of the first passage and the second passage. The supplied cooling water is configured to return to the cooling water supply source. The passage component member is configured to supply the cooling water supplied to one of the first passage and the second passage to the cooling passage through one of the first communication passage and the second communication passage. The cooling water supplied to the cooling passage is configured to be supplied to the other of the first passage and the second passage through the other of the first communication passage and the second communication passage.

  According to the present invention, since the core pin according to the present invention of any one of the aspects described above is provided, the same effect as the effect of the core pin of the present invention, for example, the core pins are simply crossed. While being able to arrange | position, the effect etc. which can ensure the cooling property of a cast pin simply also in the said arrangement | positioning state can be show | played.

  According to the further form of the core pin apparatus which concerns on this invention, a channel | path component member installs in the 2nd axial center hole while supporting the said 1st hollow member which has a 3rd axial center hole, and the said 1st hollow member. And a supporting member. The first hollow member is supported by the support member such that a first annular gap is formed between the first hollow member, the second shaft center hole, and the cooling passage. The third shaft center hole is configured to communicate with the first communication path. The first annular gap is configured to communicate with the second communication path.

  According to this embodiment, the double-pipe structure is constituted by the core pin and the passage constituting member, the inner passage of the double-pipe structure is connected to the first communication passage, and the outer passage of the double-pipe structure is connected to the second connection. Since it is a structure only communicating with the passage, the passage for supplying the cooling water from the first or second passage to the tip portion of the pin portion and supplying the cooling water having passed to the tip portion to the second or first passage The configuration can be easily secured.

  According to the further form of the cast pin apparatus which concerns on this invention, the recirculation | reflux channel | path structural member has a 2nd hollow member and a 3rd hollow member. The second hollow member has a fourth shaft center hole and is configured to be connected to the first shaft center hole. Further, the second hollow member has a branch channel that penetrates from the fourth axial center hole to the outer peripheral surface of the second hollow portion. The third hollow member has a fifth shaft center hole and is configured to be inserted through the fourth shaft center hole. The third hollow member is configured to be disposed in the fourth shaft center hole with a second annular gap between the third hollow member and the fourth shaft center hole. The fifth shaft center hole is configured to communicate with the third communication path. Further, the second annular gap is configured to be communicated with the fourth communication path via the branch channel.

  According to the present embodiment, the second hollow member and the third hollow member constitute a double pipe structure, the inner passage of the double pipe structure communicates with the third communication path, and the outer passage of the double pipe structure Since it is the structure which is only connected to the 4th communicating path via a distribution channel, while supplying the cooling water from a cooling water supply source to the 1st or 2nd path, the cooling water from the 2nd or 1st path is supplied. A passage configuration for returning to the cooling water supply source can be easily secured.

  According to the preferable form of the casting apparatus which concerns on this invention, the casting apparatus which cast-molds an engine block member provided with the support part which can support a crankshaft rotatably is comprised. The casting apparatus includes a casting mold and the core pin apparatus according to any one of the above-described aspects of the present invention. The mold has a cavity for constituting an engine block member. The cast pin device is installed in the mold so that a part of the pin portion protrudes into the cavity in order to form a bolt hole for fastening the bearing cap in the support portion.

  The “engine block” in the present invention typically corresponds to an engine structural member in which a cylinder block in which a cylinder bore is formed and a crankcase constituting a crank chamber is integrated, but only the crankcase. Are preferably included.

  According to the present invention, since the cast pin device according to the present invention of any one of the aspects described above is provided, the same effect as that produced by the cast pin device of the present invention, for example, the cast pins are simply crossed. In addition to being able to be arranged in a shape, the effect of being able to easily ensure the cooling performance of the core pin can be achieved even in the arrangement state. Accordingly, it is possible to reduce the machining allowance and the material weight when forming the bolt holes in the engine block member, and it is possible to improve the quality of the engine block member itself.

  According to the further form of the casting apparatus according to the present invention, a cast pin apparatus for forming a lubricating hole having an axial center line in a direction intersecting with the axial center line of the bolt hole for fastening the bearing cap in the support portion. There is another cast pin device that is inserted into the through-hole and installed in the mold in a state in which a part projects from the cavity.

  According to this form, both a bolt hole and a lubrication hole can be shape | molded using a cast pin. Thereby, while being able to aim at the reduction of the processing allowance at the time of shape | molding a hole (hole) and a raw material weight more, the improvement of the quality of engine block member itself can be aimed at.

  According to the further form of the casting apparatus which concerns on this invention, another casting pin apparatus is comprised so that it may have a casting pin comprised so that it may be cooled with cooling water.

  According to this embodiment, the effect of the present invention is more conspicuous in the structure in which the core pin of another core pin device is formed to have a large diameter because it has a cooling passage for flowing cooling water therein. It can be.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which aims at the further improvement of a fuel consumption can be provided.

It is a block diagram which shows the outline of a structure of the casting apparatus 1 which concerns on embodiment of this invention. It is an external view which shows the external appearance of the core pin assembly 20 which concerns on embodiment of this invention. It is a top view of the core pin 22. It is the front view which looked at the core pin 22 from the axial centerline direction. It is sectional drawing which shows the AA cross section of FIG. It is sectional drawing which shows the BB cross section of FIG. 3 is an external view showing an external appearance of a pipe member 24. FIG. 3 is a cross-sectional view showing a cross section of a pipe member 24. FIG. 4 is a cross-sectional view showing a state in which a pipe member 24 is assembled to a core pin 22. FIG. FIG. 3 is a schematic cross-sectional view showing an outline of the configuration of an intermediate passage component member 26 in cross section. 4 is a cross-sectional view showing a cross section of a pipe member 52. FIG. It is an expanded sectional view which expands and shows the C section of FIG. 4 is a cross-sectional view showing a cross section of a pipe member 54. FIG. 4 is a cross-sectional view showing a cross section of a block body 56. FIG. It is the arrow line view which looked at FIG. 14 from the arrow V direction. FIG. 3 is a state diagram showing a state in which an intermediate passage component member 26 is connected to a core pin 22. It is a state figure showing the state where other core pin assembly 42 crossed core pin assembly 20 concerning an embodiment of the invention. FIG. 5 is an explanatory view showing a state of cooling water flowing inside the intermediate passage constituting member 26. FIG. 4 is an explanatory view showing a state of cooling water flowing inside the intermediate passage constituting member 26 and the core pin 22. It is explanatory drawing which shows the mode of the cooling water which flows through the inside of the casting pin. It is a state figure which shows the state which connected the intermediate channel | path structural member 26 to the core pin 122 of the modification. It is sectional drawing which shows the state by which the pipe member 24 was assembled | attached to the core pin 222 of the modification. It is sectional drawing which shows the state by which the pipe member 124 of the modification was assembled | attached to the core pin 22. FIG.

  Next, the best mode for carrying out the present invention will be described using examples.

  A casting apparatus 1 according to the present embodiment is configured as an apparatus for molding a cylinder block of an internal combustion engine. As shown in FIG. 1, a mold 2 and three core pin assemblies 20, 42, 44 and a cooling water supply source 70 for supplying cooling water to the core pin assemblies 20, 42 and 44. The mold 2 is an example of an implementation configuration corresponding to the “mold” in the present invention.

  As shown in FIG. 1, the mold 2 includes a movable mold 4, a fixed mold 6, and a movable core 8. The movable mold 4 is integrally formed with a water jacket forming insert 10 and a bore pin 12.

  The fixed mold 6 is integrally formed with a crank chamber forming core 6a for forming a crank chamber in the cylinder block and a bearing surface forming core 6b for forming a bearing surface on a support wall portion that supports the crankshaft. Is formed. A support wall part and a bearing surface are examples of the implementation structure corresponding to the "support part" in this invention.

  Further, as shown in FIG. 1, the fixed die 6 is formed with insertion holes 7a, 7b, and 7c through which the cast pin assemblies 20, 42, and 44 are inserted.

  As shown in FIG. 1, the insertion holes 7 a and 7 c are formed on both sides (left and right direction in FIG. 1) of the fixed die 6 with the bearing surface forming core 6 b interposed therebetween. The insertion hole 7b is formed so as to cross the insertion hole 7a and to penetrate the bearing surface forming core 6b.

  By clamping the mold 2, a cavity Cab that defines a shape corresponding to a cylinder block as a cast product is defined. Further, as shown in FIG. 1, a cast pin 14 is disposed on the axial center line of the insertion hole 7b and in the cavity Cab near the connecting corner between the bore pin 12 and the crank chamber forming core 6a. Is done. The cast pin 14 is a pin for forming the main oil gallery in the cylinder block, and is disposed so as to extend in the cylinder row direction (paper surface direction in FIG. 1).

  As shown in FIG. 2, the cast pin assembly 20 connects the cast pin 22, the pipe member 24 installed inside the cast pin 22, the cast pin 22, and the cooling water supply source 70. An intermediate passage constituting member 26. As shown in FIG. 1, the cast pin assembly 20 is inserted into the insertion hole 7 a and is installed in the fixed die 6 in a state where a pin portion 22 a described later protrudes into the cavity Cab. That is, one of a pair of bolt holes for fastening the bearing cap to the support wall portion of the cylinder block is formed by the pin portion 22a. The cast pin assembly 20 is an example of an implementation configuration corresponding to the “cast pin device” in the present invention.

  As shown in FIGS. 2 and 3, the cast pin 22 includes a pin portion 22 a and a holding portion 22 b that is integrally connected to the pin portion 22 a and is held by the fixed die 6. The holding part 22b is an example of the implementation structure corresponding to the "main part" in the present invention.

  The pin portion 22a has a circular cross-sectional shape perpendicular to the axial center line of the pin portion 22a, and has a tapered shape in which the area of the circle gradually decreases toward the tip (right side in FIG. 3). .

  As shown in FIG. 4, the holding portion 22 b has a flat cross-sectional shape perpendicular to the axial center line of the holding portion 22 b. Specifically, the holding portion 22b is formed in an oval shape in which the above-described cross-sectional shape connects two circles having the same radius by a common circumscribing line. Here, by making the cross-sectional shape of the holding portion 22b not an circle but an ellipse, it is possible to prevent the holding portion 22b from becoming unnecessarily large while securing a space for forming side holes 32b and 32c described later. doing. Thereby, the processing scale of the fixed mold | type 6 including the magnitude | size of the penetration hole 7a can be restrained small.

  Further, as shown in FIG. 5, the holding portion 22b is formed with a through hole 25 penetrating through two opposing flat surfaces 23a and 23b constituting a common circumscribed line in a direction intersecting the axial center line of the holding portion 22b. Yes. The crossing angle of the through hole 25 with respect to the axial center line of the holding portion 22b is configured to be the same as the crossing angle of the insertion hole 7b with respect to the insertion hole 7a, and the core pin assembly 20 is installed in the fixed mold 6. In this case, the through hole 25 is configured to complement a portion interrupted by the insertion hole 7a of the insertion hole 7b.

  As shown in FIG. 6, the core pin 22 includes an axial center hole 32 a formed along the axial center line of the pin portion 22 a and the holding portion 22 b, and holding portions on both sides of the through hole 25. Side holes 32b and 32c drilled along the axial center hole 32a are formed in a direction parallel to the axial center line of 22b.

  That is, the shaft center hole 32a and the side holes 32b and 32c are formed in an oblong long axis direction (left-right direction in FIG. 4) when the holding portion 22b is viewed from the axial center line direction, as shown in FIG. The side holes 32b, the axial center holes 32a, and the side holes 32c are arranged in a horizontal line in this order from the left side. The side holes 32b and 32c are an example of the implementation structure corresponding to the "2nd and 1st channel | path" in this invention.

  As shown in FIG. 6, the shaft center hole 32 a is drilled by a drill or the like from a base end portion 23 c as an end portion on the opposite side to the side to which the pin portion 22 a of the holding portion 22 b is connected. The pin portion 22a is formed to a depth reaching the tip end portion. That is, the shaft center hole 32a is disposed on the base end portion side shaft center hole 34a disposed on the base end portion 23c side of the holding portion 22b with the through hole 25 interposed therebetween, and on the pin portion 22a side with the through hole 25 interposed therebetween. The pin portion side shaft center hole 34b is separated. The portion of the shaft center hole 32a formed in the holding portion 22b corresponds to the “shaft center hole” in the present invention, and the base end side shaft center hole 34a corresponds to the “first shaft center hole” in the present invention. It is an example of the implementation structure to do.

  As shown in FIG. 6, the base end side shaft center hole 34 a is stepped with an inner diameter reduced toward the through hole 25 in the vicinity of the center in the extending direction of the base end side shaft center hole 34 a. It is comprised by the hole, and is opened in the both ends of the base end part 23c side and the through-hole 25 side.

  Further, as shown in FIG. 6, the pin portion side shaft center hole 34b is composed of a pin portion inner hole 34b1 formed near the pin portion 22a and a holding portion inner hole 34b2 formed in the holding portion 22b. . The inner diameter of the pin portion inner hole 34b1 is configured to be smaller than the inner diameter of the holding portion inner hole 34b2. That is, the pin portion side shaft center hole 34b is configured as a step hole. As shown in FIG. 6, the pin portion side shaft center hole 34b is opened on the through hole 25 side, but is not opened at the tip portion of the pin portion 22a. The pin portion inner hole 34b1 corresponds to the “cooling passage” in the present invention, and the holding portion inner hole 34b2 is an example of an implementation configuration corresponding to the “second shaft center hole” in the present invention.

  As shown in FIG. 6, the side holes 32b and 32c are drilled from the base end portion 23c toward the connection end portion 23d as the end portion on the side where the pin portion 22a of the holding portion 22b is connected by a drill or the like. ing. The side holes 32b and 32c are formed to a predetermined depth. In the present embodiment, the predetermined depth is set to a depth at which the side holes 32b and 32c reach the vicinity of the connection end 23d but do not penetrate the connection end 23d.

  As shown in FIG. 6, the side holes 32b and 32c and the base end side shaft center hole 34a are communicated with each other through communication paths 36a and 36b, respectively. The communication paths 36a and 36b are an example of an implementation configuration corresponding to the “fourth and third communication paths” in the present invention.

  As shown in FIG. 6, the communication passages 36a and 36b pass through the side holes 32b and 32c from the curved surfaces 23e and 23f side (see also FIG. 4) of the holding portion 22b to reach the base end side shaft center hole 34a. ing. The communication paths 36a and 36b are formed at different positions in the extending direction of the holding portion 22b.

  Specifically, the communication path 36a is formed near the base end portion 23c of the holding portion 22b, and communicates a portion having a large inner diameter with the side hole 32b in the base end side axial center hole 34a. The passage 36b is formed near the through hole 25 of the holding portion 22b, and communicates a portion having a narrow inner diameter with the side hole 32c in the base end side shaft center hole 34a.

  Further, as shown in FIG. 6, the side holes 32b and 32c and the pin portion side shaft center hole 34b are communicated with each other through communication paths 38a and 38b, respectively. The communication paths 38a and 38b are an example of an implementation configuration corresponding to the “second and first communication paths” in the present invention.

  As shown in FIG. 6, the communication passages 38a and 38b penetrate the side holes 32b and 32c from the curved surfaces 23e and 23f side (see also FIG. 4) of the holding portion 22b to reach the pin portion side shaft center hole 34b. Yes. The communication passages 38a and 38b are arranged at different positions in the extending direction of the holding portion 22b.

  Specifically, the communication passage 38a is formed near the connection end 23d of the holding portion 22b, and communicates the pin portion inner hole 34b1 and the side hole 32b. The communication passage 38b is a through hole of the holding portion 22b. The holding portion inner hole 34b2 and the side hole 32c are communicated with each other.

  The opening on the through hole 25 side of the base end side shaft center hole 34a and the pin portion side shaft center hole 34b, the opening on the base end portion 23c side of the side holes 32b, 32c, and the communication paths 36a, 36b, 38a, 38b As shown in FIGS. 9 and 16, a plug cap PC or the like is press-fitted into each of the openings on the curved surfaces 23e and 23f side and closed.

  The plug cap PC is welded and fixed to each opening by brazing so as to be flush with the outer peripheral surface of the core pin 22. Thereby, it can prevent reliably that cooling water leaks from each opening. Note that the plug cap PC is press-fitted into the opening of the pin portion side shaft center hole 34b on the through hole 25 side after a pipe member 24 described later is installed in the pin portion side shaft center hole 34b.

  As shown in FIGS. 7 and 8, the pipe member 24 includes a cooling pipe 24a and a base portion 24b attached integrally to one end of the cooling pipe 24a by brazing or the like. The pipe member 24 corresponds to the “passage component member” in the present invention, the cooling pipe 24a corresponds to the “first hollow member” in the present invention, and the base portion 24b corresponds to the “support member” in the present invention. It is an example of an implementation structure.

  As shown in FIG. 9, the cooling pipe 24a is configured to have an outer diameter smaller than the inner diameter of the pin portion inner hole 34b1.

  As shown in FIG. 8, the base portion 24b is configured as a cylindrical member having a substantially H-shaped cross section along the major axis direction of the base portion 24b. That is, the base portion 24b includes a large diameter portion 24c disposed at both ends in the major axis direction and a small diameter portion 24d disposed between the large diameter portions 24c. As shown in FIG. 9, the outer diameter of the large diameter portion 24 c is configured to have an outer diameter substantially the same as the inner diameter of the holding portion inner hole 34 b 2 of the holding portion 22 b of the core pin 22.

  As shown in FIG. 8, an inner hole 24b1 is formed in the base portion 24b concentrically with the long axis of the base portion 24b. The inner hole 24b1 has one end side in the long axis direction of the base portion 24b (the right side in FIG. 8) opened, but the other end side in the long axis direction of the base portion 24b (the left side in FIG. 8) is closed. It is configured as. The inner diameter of the inner hole 24b1 is substantially the same as the outer diameter of the cooling pipe 24a.

  As shown in FIG. 8, a through hole 24b2 that penetrates to the inner hole 24b1 is formed in the small diameter portion 24d of the base portion 24b. The through hole 24b2 is configured in the radial direction of the small diameter portion 24d.

  As shown in FIG. 9, the pipe member 24 thus configured has a pin portion side shaft extending from an opening on the through hole 25 side of the pin portion side shaft center hole 34 b so that the cooling pipe 24 a is on the front side (right side in FIG. 9). The large diameter portion 24c of the base portion 24b is inserted into the center hole 34b and is press-fitted into the holding portion inner hole 34b2 to be attached to the core pin 22.

  Here, the press-fitting fitting of the base portion 24b to the holding portion inner hole 34b2 is configured such that the cooling water does not leak from between the outer peripheral surface of the large diameter portion 24c and the inner peripheral surface of the holding portion inner hole 34b2.

  As shown in FIG. 9, the pipe member 24 has an end surface on the side where the cooling pipe 24a of the base portion 24b is connected to a stepped portion that is a connecting portion between the holding portion inner hole 34b2 and the pin portion inner hole 34b1. By inserting the base portion 24b, positioning in the axial center line direction is performed.

  At this time, the small diameter portion 24d of the base portion 24b is installed at a position corresponding to the communication path 38b of the holding portion 22b of the core pin 22 as shown in FIG. As a result, the communication passage 38b communicates with the internal passage of the cooling pipe 24a through the through hole 24b2 formed in the small diameter portion 24d.

  By attaching the pipe member 24 to the core pin 22 in this way, a double pipe structure including the pin portion inner hole 34b1 and the cooling pipe 24a is configured. At this time, as shown in FIG. 9, the large diameter portion 24c of the base portion 24b prevents the communication passage 38a and the communication passage 38b from short-circuiting each other. That is, the communication path 38a is configured to be able to communicate with the communication path 38b only through the internal path of the cooling pipe 24a. The internal passage of the cooling pipe 24a is an example of an implementation configuration corresponding to the “third shaft center hole” in the present invention.

  As shown in FIG. 10, the intermediate passage component member 26 includes pipe members 52 and 54 and a block body 56. The intermediate passage constituting member 26 corresponds to the “return passage constituting member” in the present invention, the pipe member 52 corresponds to the “second hollow member” in the present invention, and the pipe member 54 corresponds to the “third hollow member” in the present invention. It is an example of the implementation structure corresponding to "member."

  As shown in FIGS. 11 and 12, the pipe member 52 is configured in a cylindrical shape having a passage for circulating cooling water therein. As shown in FIG. 12, three annular grooves 52a, 52b, and 52c are formed on the outer peripheral surface on one end side in the longitudinal direction of the pipe member 52 (the right side in FIGS. 11 and 12). A male screw (not shown) is formed on the outer peripheral surface of the pipe member 52 on the other end side in the longitudinal direction (left side in FIG. 11). The passage inside the pipe member 52 is an example of an implementation configuration corresponding to the “fourth axial center hole” in the present invention.

  As shown in FIG. 12, the three annular grooves 52a, 52b, and 52c are arranged side by side in the longitudinal direction of the pipe member 52, and the bottom surface of the annular groove 52b disposed at the center is arranged inside the pipe member 52. A through hole 52d that penetrates to the passage is formed. As shown in FIG. 10, an O-ring 57 is attached to the annular grooves 52a and 52c arranged on both sides of the annular groove 52b. The through hole 52d is an example of an implementation configuration corresponding to the “dividing channel” in the present invention.

  As shown in FIG. 13, the pipe member 54 includes a cooling pipe 54a and a screw plug 54b attached integrally to one end of the cooling pipe 54a by brazing or the like. As shown in FIG. 10, the cooling pipe 54 a is configured to have an outer diameter smaller than the inner diameter of the pipe member 52. The internal passage of the cooling pipe 54a is an example of an implementation configuration corresponding to the “fifth shaft center hole” in the present invention.

  As shown in FIGS. 14 and 15, the block body 56 is configured as a rectangular parallelepiped, and has a through hole 56 a penetrating in the longitudinal direction (left and right direction in FIG. 14) and two orthogonal holes perpendicular to the through hole 56 a. 56b and 56c are formed.

  One end side of the through hole 56a (right side in FIG. 14), a portion corresponding to the space between the two orthogonal holes 56b and 56c in the through hole 56a, and the other end side of the through hole 56a (left side in FIG. 14) As shown, female threads 57a, 57b, and 57c are formed. The male screw of the pipe member 52 is threadedly engaged with the female screw 57a. The female screws 57b and 57c are configured as taper screws (gas screws). The screw plug 54b of the pipe member 54 is engaged with the female screw 57b, and the plug cap PC is engaged with the female screw 57c.

  Further, female screws are also formed in the orthogonal holes 56b and 56c as shown in FIG. The female screw is configured as a taper screw (gas screw). A pipe (not shown) from the cooling water supply source 70 is screw-engaged with the female screw.

  The pipe member 52 is screw-engaged with the female screw 57a on one end side of the through hole 56a of the block body 56 thus configured, and the pipe member 52 is attached to the block body 56, and the other end of the through hole 56a of the block body 56 The pipe member 54 is inserted from the side, and the screw plug 54 b is screw-engaged with the female screw 57 b to attach the pipe member 54 to the block body 56. Then, after the pipe member 54 is attached to the block body 56, the plug cap PC is threadedly engaged with the female screw 57c on the other end side of the through hole 56a.

  By attaching the screw plug 54b to the block body 56, as shown in FIG. 10, the orthogonal hole 56b and the orthogonal hole 56c are prevented from being short-circuited with each other. Further, in a state where the pipe members 52 and 54 are attached to the block body 56, as shown in FIG. 10, the tip of the cooling pipe 54a protrudes a predetermined length from the tip of the pipe member 52, and the cooling pipe A state in which 54 a has a predetermined gap with respect to the internal passage of the pipe member 52, that is, a double pipe structure is formed by the cooling pipe 54 a and the pipe member 52.

  Here, the annular opening formed at the tip of the pipe member 52 is sealed by brazing or the like, as shown in FIG. Thereby, the orthogonal hole 56b communicates only with the internal passage of the cooling pipe 54a, and the orthogonal hole 56c is an internal passage of the pipe member 52 (an annular passage constituted by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a). ) Through the through hole 52d. The brazing of the annular opening formed at the tip of the pipe member 52 also contributes to the reliable holding of the double pipe structure by the pipe member 52 of the cooling pipe 54a.

  As shown in FIG. 16, the intermediate passage constituting member 26 thus configured is connected to the core pin 22 by inserting the pipe member 52 into the base end side shaft center hole 34 a of the core pin 22. At this time, the intermediate passage constituting member 26 is set so that the through hole 52d of the pipe member 52 is at a position corresponding to the communication passage 36a of the holding portion 22b of the core pin 22.

  Here, since the O-ring 57 is attached to the annular grooves 52a and 52c of the pipe member 52, as shown in FIG. 16, the through hole 52d of the pipe member 52 has a base end side axial center hole 34a. It is possible to communicate only with the communication path 36a. Further, the internal passage of the cooling pipe 54a can communicate with only the communication passage 36b through the base end side shaft center hole 34a.

  As shown in FIG. 1, the core pin assembly 42 is inserted into the insertion hole 7 b, and is installed in the fixed die 6 with the pin portion protruding into the cavity Cab. At this time, the core pin assembly 42 is inserted through the through hole 25 formed in the holding portion 22b of the core pin assembly 20 and intersects the core pin assembly 20 as shown in FIG. It has become. The core pin assembly 42 is configured as a movable core pin assembly that can be inserted into and removed from the insertion hole 7b by a hydraulic cylinder (not shown).

  The tip of the pin portion of the core pin assembly 42 is in contact with the core pin 14 or is opposed to the core pin 14 with a slight gap. As a result, a hole that can be penetrated from the main oil gallery to the bearing surface of the support wall portion of the cylinder block is configured, and one of the lubricating oil supply passages for supplying the lubricating oil from the main oil gallery to the bearing surface is a cast molded product. The cylinder block is molded. The cast pin assembly 42 is an example of an implementation configuration corresponding to the “other cast pin device” in the present invention.

  As shown in FIG. 1, the core pin assembly 44 is inserted into the insertion hole 7 c and installed in the fixed die 6 with the pin portion protruding into the cavity Cab. That is, the other of the pair of bolt holes for fastening the bearing cap to the support wall portion of the cylinder block is formed by the pin portion.

  Next, the operation of the cored pin assembly 20 thus configured, in particular, the cooling water supplied from the cooling water supply source 70 to the pin part 22a of the cored pin 22 and recirculated from the pin part 22a to the cooling water supply source. The flow will be described.

  As shown in FIG. 18, the cooling water from the cooling water supply source 70 is supplied from the orthogonal hole 56b of the block body 56 to the through hole 56a via a pipe (not shown) (solid line arrow in FIG. 18). The cooling water supplied to the through hole 56a passes through the internal passage of the cooling pipe 54a of the pipe member 54 and enters the proximal end side axial center hole 34a of the holding portion 22b of the core pin 22 as shown in FIG. (A solid line arrow in FIG. 19).

  Here, the screw plug 54b is screw-engaged with the female screw 57b of the through-hole 56a, and the plug cap PC is screw-engaged with the female screw 57c of the through-hole 56a. All of the cooling water supplied to the hole 56a is supplied from the internal passage of the cooling pipe 54a to the base end side axial center hole 34a.

  As shown in FIG. 19, the cooling water supplied to the base end side shaft center hole 34a is supplied from the communication passage 36b to the side hole 32c (solid arrow in FIG. 19). Here, the gap between the pipe member 52 and the base end side shaft center hole 34a is sealed by an O-ring 57, and the annular opening formed at the tip of the pipe member 52 is sealed by brazing, Since the opening on the through hole 25 side of the base end side shaft center hole 34a is sealed by the plug cap PC, all the cooling water supplied to the base end side shaft center hole 34a is laterally transferred from the communication path 36b. It is supplied to the hole 32c.

  The opening on the base end 23c side of the side hole 32c and the opening on the curved surface 23f side of the communication path 36b are sealed by the plug cap PC as shown in FIG. The cooled water that flows is directed toward the pin portion 22a (the right side in FIG. 19).

  As shown in FIG. 20, the cooling water that has flowed toward the pin portion 22a through the side hole 32c is supplied to the holding portion inner hole 34b2 through the communication passage 38b (the solid line arrow on the left side in FIG. 20). The cooling water supplied to the holding portion inner hole 34b2 passes through the through hole 24b2 of the base portion 24b of the pipe member 24 and the internal passage of the cooling pipe 24a and is supplied to the pin portion inner hole 34b1 as shown in FIG. A solid line arrow in FIG. 20).

  Here, as shown in FIG. 20, the opening on the through hole 25 side of the holding portion inner hole 34b2 and the opening on the curved surface 23f side of the communication path 38b are sealed by the plug cap PC, and the holding portion inner hole 34b2 has a base portion. Since 24b is press-fitted, all of the cooling water supplied to the holding portion inner hole 34b2 is supplied to the pin portion inner hole 34b1 through the internal passage of the cooling pipe 24a.

  As shown in FIG. 20, the cooling water supplied to the pin portion inner hole 34b1 flows through an annular passage formed by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a (right broken arrow in FIG. 20). ). Thereby, cooling of the pin part 22a is performed. The annular passage is an example of an implementation configuration corresponding to the “first annular gap” in the present invention.

  Thus, the cooling water flowing through the annular passage constituted by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a is supplied to the side hole 32b via the communication passage 38a as shown in FIG. (The broken line arrow on the left side of FIG. 20). Here, since the opening on the curved surface 23e side of the communication passage 38a is sealed by the plug cap PC, the cooling water supplied to the side hole 32b is on the base end portion 23c side of the holding portion 22b (the left side in FIG. 20). )

  As shown in FIG. 19, the coolant flowing through the side hole 32b toward the base end portion 23c passes through the internal passage of the pipe member 52 via the communication passage 36a, the base end side axial center hole 34a, and the through hole 52d. (An annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a) (broken arrow in FIG. 19).

  Here, as shown in FIG. 19, the opening on the curved surface 23e side of the communication path 36a and the opening on the base end portion 23c side of the side hole 32b are sealed by the plug cap PC, and the pipe member 52 and the base end are sealed. Since the gap with the part side shaft center hole 34a is sealed by the O-ring 57, all the cooling water flowing through the side hole 32b passes through the communication path 36a, the base end side shaft center hole 34a, and the through hole 52d. It is supplied to the internal passage of the pipe member 52 (annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a). The internal passage of the pipe member 52 (an annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a) is an example of an implementation configuration corresponding to the “second annular gap” in the present invention.

  Then, the cooling water supplied to the internal passage of the pipe member 52 (the annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a) is supplied to the through hole 56a as shown in FIG. Supplied and recirculated from the through hole 56a to the cooling water supply source 70 through the orthogonal hole 56c and a pipe (not shown) (broken line arrow in FIG. 18).

  In the present embodiment, the cooling water supplied from the cooling water supply source 70 passes from the internal passage of the cooling pipe 54a to the base end side shaft center hole 34a, the communication passage 36b, the side hole 32c, the communication passage 38b, and the holding portion. The cooling water supplied to the pin portion inner hole 34b1 through the hole 34b2, the through hole 24b2 and the internal passage of the cooling pipe 24a is supplied to the inner peripheral surface of the pin portion inner hole 34b1 and the cooling pipe 24a. Cooling water supply source 70 from the annular passage constituted by the outer peripheral surface through the communication passage 38 a, the side hole 32 b, the communication passage 36 a, the base end side shaft center hole 34 a, the through hole 52 d and the internal passage of the pipe member 52. However, the present invention is not limited to this.

  For example, the cooling water supplied from the cooling water supply source 70 is opposite to that of the present embodiment, that is, from the internal passage of the pipe member 52 to the through hole 52d, the base end side axial center hole 34a, the communication passage 36a, side. The cooling water supplied to the pin passage inner hole 34b1 is supplied to an annular passage formed by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a via the rectangular hole 32b and the communication passage 38a. Cooling water supply source through the internal passage of the pipe 24a, the through hole 24b2, the holding portion inner hole 34b2, the communication passage 38b, the side hole 32c, the communication passage 36b, the base end side axial center hole 34a and the internal passage of the cooling pipe 54a. It is good also as a structure which recirculates to 70.

  Alternatively, as shown in FIG. 21, in place of the cast pin 22 having the communication passages 36a and 36b, the communication passage 136a that connects the side hole 32b and the portion with the narrow inner diameter of the base end side axial center hole 34a. And a core pin 122 of a modified example having a side hole 32c and a communication passage 136b communicating with a portion having a large inner diameter in the base end side shaft center hole 34a. From the internal passage of the cooling pipe 54a through the base end side axial center hole 34a, the communication passage 136a, the side hole 32b, and the communication passage 38a, the cooling water is cooled to the inner peripheral surface of the pin portion inner hole 34b1. The cooling water supplied to the annular passage composed of the outer peripheral surface of the pipe 24a and thus supplied to the pin portion inner hole 34b1 is the inner passage of the cooling pipe 24a, the through hole 24b2, the holding portion inner hole 34b2, the communication passage 38b, side. Hole 32c, the communication passage 136 b, the base end shaft center hole 34a, may be configured to reflux cooling water supply source 70 through the internal passage of the through-hole 52d and the pipe member 52. The communication path 136a and the communication path 136 are examples of implementation configurations corresponding to the “third communication path” and the “fourth communication path” in the present invention, respectively.

  Further, in this case, the cooling water supplied from the cooling water supply source 70 passes through the internal passage of the pipe member 52, the through hole 52d, the base end side shaft center hole 34a, the communication passage 136b, the side hole 32c, and the communication passage 38b. The cooling water supplied to the pin portion inner hole 34b1 through the holding portion inner hole 34b2, the through hole 24b2 and the internal passage of the cooling pipe 24a is cooled with the inner peripheral surface of the pin portion inner hole 34b1. From the annular passage formed by the outer peripheral surface of the pipe 24a to the cooling water supply source 70 through the communication passage 38a, the side hole 32b, the communication passage 136a, the base end side axial center hole 34a, and the internal passage of the cooling pipe 54a. It is good also as a structure which recirculate | refluxs.

  Further, as shown in FIG. 22, instead of the cast pin 22 having the communication passages 38a and 38b, the communication passage 138a that connects the side hole 32b and the holding portion inner hole 34b2, and the side hole 32c and the inside of the pin portion. After adopting a modified core pin 222 having a communication passage 138b that communicates with the hole 34b1, the cooling water supplied from the cooling water supply source 70 is supplied to the base end side shaft from the internal passage of the cooling pipe 54a. Via the center hole 34a, the communication passage 36b, the side hole 32c and the communication passage 138b, the pin portion inner hole 34b1 is supplied to the annular passage formed by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a. The cooling water supplied to the internal passage of the cooling pipe 24a, the through hole 24b2, the holding portion inner hole 34b2, the communication passage 138a, the side hole 32b, the communication passage 36a, the base end side shaft center hole 34a, Through the internal passage of the through hole 52d and the pipe member 52 may be configured to reflux cooling water supply source 70. The communication path 138a and the communication path 138b are examples of implementation configurations corresponding to the “first communication path” and the “second communication path” in the present invention, respectively.

  Further, in this case, the cooling water supplied from the cooling water supply source 70 passes from the internal passage of the pipe member 52 to the through hole 52d, the base end side shaft center hole 34a, the communication passage 36a, the side hole 32b, and the communication passage 138a. The cooling water supplied to the pin portion inner hole 34b1 through the holding portion inner hole 34b2, the through hole 24b2 and the internal passage of the cooling pipe 24a is cooled with the inner peripheral surface of the pin portion inner hole 34b1. The cooling water supply source 70 is connected via an annular passage constituted by the outer peripheral surface of the pipe 24a, the communication passage 138b, the side hole 32c, the communication passage 36b, the base end side axial center hole 34a, and the internal passage of the cooling pipe 54a. It is good also as a structure which recirculate | refluxs.

  In the present embodiment, the base portion 24b is configured as a cylindrical member having a substantially H-shaped cross-section along the major axis direction of the base portion 24b, but is not limited thereto. For example, as shown in FIG. 23, instead of the pipe member 24 having the base portion 24b, a modified pipe member 124 having a base portion 124b configured as a simple cylindrical member may be adopted. In this case, the side hole 32c and the internal passage of the cooling pipe 124a communicate with each other via the communication passage 38b and the holding portion inner hole 34b2.

  In the present embodiment, the pin portion 22a and the holding portion 22b are integrally formed. However, the pin portion 22a and the holding portion 22b may be formed separately and then integrated.

  In the present embodiment, the cross-sectional shape perpendicular to the axial center direction of the holding portion 22b is formed in an oval shape, but the present invention is not limited to this. For example, the cross-sectional shape may be an elliptical shape or a rectangular shape. Moreover, you may comprise in circular shape instead of these flat shapes.

  In the present embodiment, the side holes 32b and 32c are set to a depth that does not penetrate the connection end 23d, but the side holes 32b and 32c may be configured to penetrate the connection end 23d. In this case, the opening on the side of the connection end 23d of the side holes 32b and 32c may be sealed with the plug cap PC.

  In the present embodiment, the cast pin assembly 20 is applied to the formation of a bolt hole for fastening a bearing cap that is provided so as to intersect with a lubricating oil supply passage for supplying lubricating oil from the main oil gallery to the bearing surface. However, it is not limited to this. For example, the cast pin assembly 20 may be applied to other bolt holes and lubricating oil holes provided so as to intersect each other, a cavity for weight reduction, and the like.

  Although the present embodiment is configured as a casting apparatus for molding a cylinder block of an internal combustion engine, the present invention is not limited thereto, and any casting apparatus that molds using a core pin can be applied.

  This embodiment shows an example for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the present embodiment.

1 Casting equipment (casting equipment)
2 Mold (mold)
DESCRIPTION OF SYMBOLS 4 Movable type 6 Fixed type 6a Crank chamber shaping core 6b Bearing surface shaping core 7a Insertion hole 7b Insertion hole 7c Insertion hole 8 Movable core 10 Water jacket forming insert 12 Bore pin 14 Casting pin 20 Casting pin assembly (casting Punching pin device)
22 Casting pin (Casting pin)
22a Pin part (pin part)
22b Holding part (main part)
23a plane 23b plane 23c base end 23d connection side end 23e curved surface 23f curved surface 24 pipe member (passage component)
24a Cooling pipe (first hollow member)
24b Base part (support member)
24b1 Inner hole 24b2 Through hole 24c Large diameter part 24d Small diameter part 25 Through hole (through hole)
26 Intermediate passage component (reflux passage component)
32a Shaft center hole 32b Side hole (second passage)
32c Side hole (first passage)
34a Base end side shaft center hole (first shaft center hole)
34b Pin part side shaft center hole 34b1 Pin part inner hole (cooling passage)
34b2 Holding portion inner hole (second shaft center hole)
36a Communication path (4th communication path)
36b Communication path (third communication path)
38a Communication path (second communication path)
38b Communication path (first communication path)
42 Casting pin assembly (other casting pin assembly)
44 Casting pin assembly 52 Pipe member (second hollow member)
52a annular groove 52b annular groove 52c annular groove 52d through hole (dividing flow path)
54 Pipe member (third hollow member)
54a Cooling pipe 54b Screw plug 56 Block body 56a Through hole 56b Orthogonal hole 56c Orthogonal hole 57a Female screw 57b Female screw 57c Female screw 57 O-ring 70 Cooling water supply source (cooling water supply source)
Cab Cavity PC Plug Cap 124 Pipe member (passage component)
124b Base part (support member)
136a Communication path (third communication path)
136b Communication path (fourth communication path)
138a Communication path (first communication path)
138b Communication path (second communication path)
122 Cast Pin (Cast Pin)
222 Cast Pin (Cast Pin)

  The present invention relates to a cast pin and a cast pin device that are installed in a mold and configured to form a hole in a cast product, and a casting device including the same.

  Japanese Patent Application Laid-Open No. 2004-19513 (Patent Document 1) discloses a technique of forming a bolt hole for fastening a bearing cap and a lubrication hole for crankshaft bearing lubrication using a cast pin in a cast cylinder block. Is disclosed.

  With the above-described technique, it is possible to reduce the machining allowance and the material weight as compared with the case of forming holes (holes) by machining, and it is possible to improve the casting quality.

  By the way, since the core pin is directly immersed in a high-temperature molten metal, a technology for improving the durability of the core pin itself and a technology for suppressing the occurrence of solidification shrinkage nests have been proposed. From this point of view, the applicant has also proposed a technique for circulating cooling water inside the core pin (Patent Document 2).

JP 2004-19513 A Japanese Patent Laid-Open No. 9-1313

  However, in the technique disclosed in Patent Document 1, since the bolt hole and the lubrication hole are arranged so that the axial center lines of the bolt hole and the lubrication hole intersect each other, each hole (hole) is formed. Therefore, it is necessary to arrange the cast pins for crossing each other. When the core pins are arranged in an intersecting manner, the core pins must be configured so that the core pins do not collide with each other. The shape of the passage for circulating the cooling water inside the extraction pin is also complicated.

  The present invention has been made in view of the above, and an object of the present invention is to provide a technique capable of easily ensuring the cooling performance of the core pins even when the core pins are arranged in an intersecting manner. To do.

  The cast pin and the cast pin device of the present invention and the cast device provided with the same take the following means in order to achieve the above-mentioned object.

According to a preferred embodiment of the cast pin according to the present invention, a cast pin that is installed in a mold and forms a hole in a cast product is configured. The cast pin includes a pin portion and a main body portion. The pin portion is configured to protrude into the mold cavity. The main body portion is configured to extend along the major axis direction of the pin portion from one end portion in the major axis direction of the pin portion in a direction opposite to the extending direction of the pin portion. A cooling passage extending in the major axis direction of the pin portion is provided inside the pin portion. In addition, a through-hole penetrating in a direction intersecting with the extending direction of the main body portion is formed in the main body portion so that another core pin is inserted, and a through-hole is formed inside the main body portion. First and second passages extending in the major axis direction, and first and second communication passages communicating the cooling passage and the first and second passages are provided on both sides of the sandwich. The cooling water supplied from the cooling water supply source is supplied from one of the first passage and the second passage to the cooling passage through one of the first communication passage and the second communication passage, and is supplied to the cooling passage. The cooled water is recirculated from the other of the first communication path and the second communication path to the cooling water supply source via the other of the first path and the second path.

  According to the present invention, the core pins can be arranged in an intersecting manner with a simple configuration in which the other core pins are inserted through the through holes formed in the main body portion. In addition, cooling of the core pins arranged in a crossing manner with a simple configuration in which the first and second passages are provided in the main body portion while avoiding the through holes and the first and second passages are only communicated with the cooling passages. Sex can be secured.

  According to the further form of the core pin which concerns on this invention, a main-body part seems to be connected to a cooling passage via a through-hole from the base end part on the opposite side to the front-end | tip part by which the pin part was connected. It has a shaft center hole drilled in. The shaft center hole includes a first shaft center hole disposed near the base end portion with the through hole interposed therebetween, and a second shaft center hole disposed near the distal end portion sandwiching the through hole. Further, the first shaft center hole and the second shaft center hole are configured such that the opening on the through hole side is closed. Furthermore, the 1st and 2nd channel | path is drilled over predetermined length from the base end part. The cooling water supplied to one of the first passage and the second passage is configured to be supplied to the cooling passage via one of the first communication passage, the second shaft center hole, and the second communication passage. The cooling water supplied to the cooling passage is supplied to the other of the first passage and the second passage through the other of the first communication passage, the second shaft center hole, and the second communication passage.

  According to this embodiment, the shaft center hole and the first and second passages are drilled from the base end side of the main body, and the second shaft center hole and the first and second passages are first and second connected. While communicating with the passage and only closing unnecessary openings, it is possible to easily secure the cooling water passage inside the core pins arranged in an intersecting manner.

  According to the further form of the core pin which concerns on this invention, a main-body part seems to be connected to a cooling passage via a through-hole from the base end part on the opposite side to the front-end | tip part by which the pin part was connected. It has a shaft center hole drilled in. The shaft center hole includes a first shaft center hole disposed near the base end portion with the through hole interposed therebetween, and a second shaft center hole disposed near the distal end portion sandwiching the through hole. Further, the first shaft center hole and the second shaft center hole are configured such that the opening on the through hole side is closed. Further, the first and second passages are configured so as to be perforated over a predetermined length from the base end portion and to close the base end side. In addition, third and fourth communication passages that communicate the first shaft center hole with the first and second passages are further provided inside the main body. The cooling water supplied from the cooling water supply source is configured to be supplied to one of the first passage and the second passage through one of the first shaft center hole, the third communication passage, and the fourth communication passage. The cooling water supplied from the cooling passage to the other of the first passage and the second passage is returned to the cooling water supply source via the first shaft center hole, the third communication passage, and the other of the fourth communication passage. It is configured.

  According to this embodiment, the shaft center hole and the first and second passages are formed from the base end side of the main body, and the first shaft center hole and the first and second passages are connected to the third and fourth stations. While communicating with the passage and only closing unnecessary openings, it is possible to easily secure the cooling water passage inside the core pins arranged in an intersecting manner.

  According to the further form of the core pin which concerns on this invention, the main-body part has a cross-sectional shape perpendicular | vertical with respect to the major axis direction of a pin part to a longitudinal direction in the arrangement direction of a 1st channel | path, a through-hole, and a 2nd channel | path. It is comprised in the flat shape which has. The “flat shape” in the present invention is defined as a state in which the length in the vertical direction in the cross section is smaller than the length in the horizontal direction. For example, an elliptical shape, a rectangular shape, and an oval shape correspond to this. Here, the “oval shape” corresponds to a shape in which two circles having the same radius are connected by a common outer tangent.

  According to this form, internal passages, such as the 1st and 2nd passages, can be secured, controlling that a cast pin itself enlarges. Moreover, the change scale of the mold in which the core pin is installed can be suppressed to be small.

  According to a preferred embodiment of the cast pin device according to the present invention, a cast pin device that is installed in a mold and forms a hole in a cast product is configured. The cast pin device includes the cast pin according to the present invention according to any one of the above-described aspects, a reflux passage constituting member, and a passage constituting member. The recirculation passage component is configured to supply the cooling water supplied from the cooling water supply source to one of the first passage and the second passage, and from the cooling passage to the other of the first passage and the second passage. The supplied cooling water is configured to return to the cooling water supply source. The passage component member is configured to supply the cooling water supplied to one of the first passage and the second passage to the cooling passage through one of the first communication passage and the second communication passage. The cooling water supplied to the cooling passage is configured to be supplied to the other of the first passage and the second passage through the other of the first communication passage and the second communication passage.

  According to the present invention, since the core pin according to the present invention of any one of the aspects described above is provided, the same effect as the effect of the core pin of the present invention, for example, the core pins are simply crossed. While being able to arrange | position, the effect etc. which can ensure the cooling property of a cast pin simply also in the said arrangement | positioning state can be show | played.

  According to the further form of the core pin apparatus which concerns on this invention, a channel | path component member installs in the 2nd axial center hole while supporting the said 1st hollow member which has a 3rd axial center hole, and the said 1st hollow member. And a supporting member. The first hollow member is supported by the support member such that a first annular gap is formed between the first hollow member, the second shaft center hole, and the cooling passage. The third shaft center hole is configured to communicate with the first communication path. The first annular gap is configured to communicate with the second communication path.

  According to this embodiment, the double-pipe structure is constituted by the core pin and the passage constituting member, the inner passage of the double-pipe structure is connected to the first communication passage, and the outer passage of the double-pipe structure is connected to the second connection. Since it is a structure only communicating with the passage, the passage for supplying the cooling water from the first or second passage to the tip portion of the pin portion and supplying the cooling water having passed to the tip portion to the second or first passage The configuration can be easily secured.

  According to the further form of the cast pin apparatus which concerns on this invention, the recirculation | reflux channel | path structural member has a 2nd hollow member and a 3rd hollow member. The second hollow member has a fourth shaft center hole and is configured to be connected to the first shaft center hole. Further, the second hollow member has a branch channel that penetrates from the fourth axial center hole to the outer peripheral surface of the second hollow portion. The third hollow member has a fifth shaft center hole and is configured to be inserted through the fourth shaft center hole. The third hollow member is configured to be disposed in the fourth shaft center hole with a second annular gap between the third hollow member and the fourth shaft center hole. The fifth shaft center hole is configured to communicate with the third communication path. Further, the second annular gap is configured to be communicated with the fourth communication path via the branch channel.

  According to the present embodiment, the second hollow member and the third hollow member constitute a double pipe structure, the inner passage of the double pipe structure communicates with the third communication path, and the outer passage of the double pipe structure Since it is the structure which is only connected to the 4th communicating path via a distribution channel, while supplying the cooling water from a cooling water supply source to the 1st or 2nd path, the cooling water from the 2nd or 1st path is supplied. A passage configuration for returning to the cooling water supply source can be easily secured.

  According to the preferable form of the casting apparatus which concerns on this invention, the casting apparatus which cast-molds an engine block member provided with the support part which can support a crankshaft rotatably is comprised. The casting apparatus includes a casting mold and the core pin apparatus according to any one of the above-described aspects of the present invention. The mold has a cavity for constituting an engine block member. The cast pin device is installed in the mold so that a part of the pin portion protrudes into the cavity in order to form a bolt hole for fastening the bearing cap in the support portion.

  The “engine block” in the present invention typically corresponds to an engine structural member in which a cylinder block in which a cylinder bore is formed and a crankcase constituting a crank chamber is integrated, but only the crankcase. Are preferably included.

  According to the present invention, since the cast pin device according to the present invention of any one of the aspects described above is provided, the same effect as that produced by the cast pin device of the present invention, for example, the cast pins are simply crossed. In addition to being able to be arranged in a shape, the effect of being able to easily ensure the cooling performance of the core pin can be achieved even in the arrangement state. Accordingly, it is possible to reduce the machining allowance and the material weight when forming the bolt holes in the engine block member, and it is possible to improve the quality of the engine block member itself.

  According to the further form of the casting apparatus according to the present invention, a cast pin apparatus for forming a lubricating hole having an axial center line in a direction intersecting with the axial center line of the bolt hole for fastening the bearing cap in the support portion. There is another cast pin device that is inserted into the through-hole and installed in the mold in a state in which a part projects from the cavity.

  According to this form, both a bolt hole and a lubrication hole can be shape | molded using a cast pin. Thereby, while being able to aim at the reduction of the processing allowance at the time of shape | molding a hole (hole) and a raw material weight more, the improvement of the quality of engine block member itself can be aimed at.

  According to the further form of the casting apparatus which concerns on this invention, another casting pin apparatus is comprised so that it may have a casting pin comprised so that it may be cooled with cooling water.

  According to this embodiment, the effect of the present invention is more conspicuous in the structure in which the core pin of another core pin device is formed to have a large diameter because it has a cooling passage for flowing cooling water therein. It can be.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which aims at the further improvement of a fuel consumption can be provided.

It is a block diagram which shows the outline of a structure of the casting apparatus 1 which concerns on embodiment of this invention. It is an external view which shows the external appearance of the core pin assembly 20 which concerns on embodiment of this invention. It is a top view of the core pin 22. It is the front view which looked at the core pin 22 from the axial centerline direction. It is sectional drawing which shows the AA cross section of FIG. It is sectional drawing which shows the BB cross section of FIG. 3 is an external view showing an external appearance of a pipe member 24. FIG. 3 is a cross-sectional view showing a cross section of a pipe member 24. FIG. 4 is a cross-sectional view showing a state in which a pipe member 24 is assembled to a core pin 22. FIG. FIG. 3 is a schematic cross-sectional view showing an outline of the configuration of an intermediate passage component member 26 in cross section. 4 is a cross-sectional view showing a cross section of a pipe member 52. FIG. It is an expanded sectional view which expands and shows the C section of FIG. 4 is a cross-sectional view showing a cross section of a pipe member 54. FIG. 4 is a cross-sectional view showing a cross section of a block body 56. FIG. It is the arrow line view which looked at FIG. 14 from the arrow V direction. FIG. 3 is a state diagram showing a state in which an intermediate passage component member 26 is connected to a core pin 22. It is a state figure showing the state where other core pin assembly 42 crossed core pin assembly 20 concerning an embodiment of the invention. FIG. 5 is an explanatory view showing a state of cooling water flowing inside the intermediate passage constituting member 26. FIG. 4 is an explanatory view showing a state of cooling water flowing inside the intermediate passage constituting member 26 and the core pin 22. It is explanatory drawing which shows the mode of the cooling water which flows through the inside of the casting pin. It is a state figure which shows the state which connected the intermediate channel | path structural member 26 to the core pin 122 of the modification. It is sectional drawing which shows the state by which the pipe member 24 was assembled | attached to the core pin 222 of the modification. It is sectional drawing which shows the state by which the pipe member 124 of the modification was assembled | attached to the core pin 22. FIG.

  Next, the best mode for carrying out the present invention will be described using examples.

  A casting apparatus 1 according to the present embodiment is configured as an apparatus for molding a cylinder block of an internal combustion engine. As shown in FIG. 1, a mold 2 and three core pin assemblies 20, 42, 44 and a cooling water supply source 70 for supplying cooling water to the core pin assemblies 20, 42 and 44. The mold 2 is an example of an implementation configuration corresponding to the “mold” in the present invention.

  As shown in FIG. 1, the mold 2 includes a movable mold 4, a fixed mold 6, and a movable core 8. The movable mold 4 is integrally formed with a water jacket forming insert 10 and a bore pin 12.

  The fixed mold 6 is integrally formed with a crank chamber forming core 6a for forming a crank chamber in the cylinder block and a bearing surface forming core 6b for forming a bearing surface on a support wall portion that supports the crankshaft. Is formed. A support wall part and a bearing surface are examples of the implementation structure corresponding to the "support part" in this invention.

  Further, as shown in FIG. 1, the fixed die 6 is formed with insertion holes 7a, 7b, and 7c through which the cast pin assemblies 20, 42, and 44 are inserted.

  As shown in FIG. 1, the insertion holes 7 a and 7 c are formed on both sides (left and right direction in FIG. 1) of the fixed die 6 with the bearing surface forming core 6 b interposed therebetween. The insertion hole 7b is formed so as to cross the insertion hole 7a and to penetrate the bearing surface forming core 6b.

  By clamping the mold 2, a cavity Cab that defines a shape corresponding to a cylinder block as a cast product is defined. Further, as shown in FIG. 1, a cast pin 14 is disposed on the axial center line of the insertion hole 7b and in the cavity Cab near the connecting corner between the bore pin 12 and the crank chamber forming core 6a. Is done. The cast pin 14 is a pin for forming the main oil gallery in the cylinder block, and is disposed so as to extend in the cylinder row direction (paper surface direction in FIG. 1).

  As shown in FIG. 2, the cast pin assembly 20 connects the cast pin 22, the pipe member 24 installed inside the cast pin 22, the cast pin 22, and the cooling water supply source 70. An intermediate passage constituting member 26. As shown in FIG. 1, the cast pin assembly 20 is inserted into the insertion hole 7 a and is installed in the fixed die 6 in a state where a pin portion 22 a described later protrudes into the cavity Cab. That is, one of a pair of bolt holes for fastening the bearing cap to the support wall portion of the cylinder block is formed by the pin portion 22a. The cast pin assembly 20 is an example of an implementation configuration corresponding to the “cast pin device” in the present invention.

  As shown in FIGS. 2 and 3, the cast pin 22 includes a pin portion 22 a and a holding portion 22 b that is integrally connected to the pin portion 22 a and is held by the fixed die 6. The holding part 22b is an example of the implementation structure corresponding to the "main part" in the present invention.

  The pin portion 22a has a circular cross-sectional shape perpendicular to the axial center line of the pin portion 22a, and has a tapered shape in which the area of the circle gradually decreases toward the tip (right side in FIG. 3). .

  As shown in FIG. 4, the holding portion 22 b has a flat cross-sectional shape perpendicular to the axial center line of the holding portion 22 b. Specifically, the holding portion 22b is formed in an oval shape in which the above-described cross-sectional shape connects two circles having the same radius by a common circumscribing line. Here, by making the cross-sectional shape of the holding portion 22b not an circle but an ellipse, it is possible to prevent the holding portion 22b from becoming unnecessarily large while securing a space for forming side holes 32b and 32c described later. doing. Thereby, the processing scale of the fixed mold | type 6 including the magnitude | size of the penetration hole 7a can be restrained small.

  Further, as shown in FIG. 5, the holding portion 22b is formed with a through hole 25 penetrating through two opposing flat surfaces 23a and 23b constituting a common circumscribed line in a direction intersecting the axial center line of the holding portion 22b. Yes. The crossing angle of the through hole 25 with respect to the axial center line of the holding portion 22b is configured to be the same as the crossing angle of the insertion hole 7b with respect to the insertion hole 7a, and the core pin assembly 20 is installed in the fixed mold 6. In this case, the through hole 25 is configured to complement a portion interrupted by the insertion hole 7a of the insertion hole 7b.

  As shown in FIG. 6, the core pin 22 includes an axial center hole 32 a formed along the axial center line of the pin portion 22 a and the holding portion 22 b, and holding portions on both sides of the through hole 25. Side holes 32b and 32c drilled along the axial center hole 32a are formed in a direction parallel to the axial center line of 22b.

  That is, the shaft center hole 32a and the side holes 32b and 32c are formed in an oblong long axis direction (left-right direction in FIG. 4) when the holding portion 22b is viewed from the axial center line direction, as shown in FIG. The side holes 32b, the axial center holes 32a, and the side holes 32c are arranged in a horizontal line in this order from the left side. The side holes 32b and 32c are an example of the implementation structure corresponding to the "2nd and 1st channel | path" in this invention.

  As shown in FIG. 6, the shaft center hole 32 a is drilled by a drill or the like from a base end portion 23 c as an end portion on the opposite side to the side to which the pin portion 22 a of the holding portion 22 b is connected. The pin portion 22a is formed to a depth reaching the tip end portion. That is, the shaft center hole 32a is disposed on the base end portion side shaft center hole 34a disposed on the base end portion 23c side of the holding portion 22b with the through hole 25 interposed therebetween, and on the pin portion 22a side with the through hole 25 interposed therebetween. The pin portion side shaft center hole 34b is separated. The portion of the shaft center hole 32a formed in the holding portion 22b corresponds to the “shaft center hole” in the present invention, and the base end side shaft center hole 34a corresponds to the “first shaft center hole” in the present invention. It is an example of the implementation structure to do.

  As shown in FIG. 6, the base end side shaft center hole 34 a is stepped with an inner diameter reduced toward the through hole 25 in the vicinity of the center in the extending direction of the base end side shaft center hole 34 a. It is comprised by the hole, and is opened in the both ends of the base end part 23c side and the through-hole 25 side.

  Further, as shown in FIG. 6, the pin portion side shaft center hole 34b is composed of a pin portion inner hole 34b1 formed near the pin portion 22a and a holding portion inner hole 34b2 formed in the holding portion 22b. . The inner diameter of the pin portion inner hole 34b1 is configured to be smaller than the inner diameter of the holding portion inner hole 34b2. That is, the pin portion side shaft center hole 34b is configured as a step hole. As shown in FIG. 6, the pin portion side shaft center hole 34b is opened on the through hole 25 side, but is not opened at the tip portion of the pin portion 22a. The pin portion inner hole 34b1 corresponds to the “cooling passage” in the present invention, and the holding portion inner hole 34b2 is an example of an implementation configuration corresponding to the “second shaft center hole” in the present invention.

  As shown in FIG. 6, the side holes 32b and 32c are drilled from the base end portion 23c toward the connection end portion 23d as the end portion on the side where the pin portion 22a of the holding portion 22b is connected by a drill or the like. ing. The side holes 32b and 32c are formed to a predetermined depth. In the present embodiment, the predetermined depth is set to a depth at which the side holes 32b and 32c reach the vicinity of the connection end 23d but do not penetrate the connection end 23d.

  As shown in FIG. 6, the side holes 32b and 32c and the base end side shaft center hole 34a are communicated with each other through communication paths 36a and 36b, respectively. The communication paths 36a and 36b are an example of an implementation configuration corresponding to the “fourth and third communication paths” in the present invention.

  As shown in FIG. 6, the communication passages 36a and 36b pass through the side holes 32b and 32c from the curved surfaces 23e and 23f side (see also FIG. 4) of the holding portion 22b to reach the base end side shaft center hole 34a. ing. The communication paths 36a and 36b are formed at different positions in the extending direction of the holding portion 22b.

  Specifically, the communication path 36a is formed near the base end portion 23c of the holding portion 22b, and communicates a portion having a large inner diameter with the side hole 32b in the base end side axial center hole 34a. The passage 36b is formed near the through hole 25 of the holding portion 22b, and communicates a portion having a narrow inner diameter with the side hole 32c in the base end side shaft center hole 34a.

  Further, as shown in FIG. 6, the side holes 32b and 32c and the pin portion side shaft center hole 34b are communicated with each other through communication paths 38a and 38b, respectively. The communication paths 38a and 38b are an example of an implementation configuration corresponding to the “second and first communication paths” in the present invention.

  As shown in FIG. 6, the communication passages 38a and 38b penetrate the side holes 32b and 32c from the curved surfaces 23e and 23f side (see also FIG. 4) of the holding portion 22b to reach the pin portion side shaft center hole 34b. Yes. The communication passages 38a and 38b are arranged at different positions in the extending direction of the holding portion 22b.

  Specifically, the communication passage 38a is formed near the connection end 23d of the holding portion 22b, and communicates the pin portion inner hole 34b1 and the side hole 32b. The communication passage 38b is a through hole of the holding portion 22b. The holding portion inner hole 34b2 and the side hole 32c are communicated with each other.

  The opening on the through hole 25 side of the base end side shaft center hole 34a and the pin portion side shaft center hole 34b, the opening on the base end portion 23c side of the side holes 32b, 32c, and the communication paths 36a, 36b, 38a, 38b As shown in FIGS. 9 and 16, a plug cap PC or the like is press-fitted into each of the openings on the curved surfaces 23e and 23f side and closed.

  The plug cap PC is welded and fixed to each opening by brazing so as to be flush with the outer peripheral surface of the core pin 22. Thereby, it can prevent reliably that cooling water leaks from each opening. Note that the plug cap PC is press-fitted into the opening of the pin portion side shaft center hole 34b on the through hole 25 side after a pipe member 24 described later is installed in the pin portion side shaft center hole 34b.

  As shown in FIGS. 7 and 8, the pipe member 24 includes a cooling pipe 24a and a base portion 24b attached integrally to one end of the cooling pipe 24a by brazing or the like. The pipe member 24 corresponds to the “passage component member” in the present invention, the cooling pipe 24a corresponds to the “first hollow member” in the present invention, and the base portion 24b corresponds to the “support member” in the present invention. It is an example of an implementation structure.

  As shown in FIG. 9, the cooling pipe 24a is configured to have an outer diameter smaller than the inner diameter of the pin portion inner hole 34b1.

  As shown in FIG. 8, the base portion 24b is configured as a cylindrical member having a substantially H-shaped cross section along the major axis direction of the base portion 24b. That is, the base portion 24b includes a large diameter portion 24c disposed at both ends in the major axis direction and a small diameter portion 24d disposed between the large diameter portions 24c. As shown in FIG. 9, the outer diameter of the large diameter portion 24 c is configured to have an outer diameter substantially the same as the inner diameter of the holding portion inner hole 34 b 2 of the holding portion 22 b of the core pin 22.

  As shown in FIG. 8, an inner hole 24b1 is formed in the base portion 24b concentrically with the long axis of the base portion 24b. The inner hole 24b1 has one end side in the long axis direction of the base portion 24b (the right side in FIG. 8) opened, but the other end side in the long axis direction of the base portion 24b (the left side in FIG. 8) is closed. It is configured as. The inner diameter of the inner hole 24b1 is substantially the same as the outer diameter of the cooling pipe 24a.

  As shown in FIG. 8, a through hole 24b2 that penetrates to the inner hole 24b1 is formed in the small diameter portion 24d of the base portion 24b. The through hole 24b2 is configured in the radial direction of the small diameter portion 24d.

  As shown in FIG. 9, the pipe member 24 thus configured has a pin portion side shaft extending from an opening on the through hole 25 side of the pin portion side shaft center hole 34 b so that the cooling pipe 24 a is on the front side (right side in FIG. 9). The large diameter portion 24c of the base portion 24b is inserted into the center hole 34b and is press-fitted into the holding portion inner hole 34b2 to be attached to the core pin 22.

  Here, the press-fitting fitting of the base portion 24b to the holding portion inner hole 34b2 is configured such that the cooling water does not leak from between the outer peripheral surface of the large diameter portion 24c and the inner peripheral surface of the holding portion inner hole 34b2.

  As shown in FIG. 9, the pipe member 24 has an end surface on the side where the cooling pipe 24a of the base portion 24b is connected to a stepped portion that is a connecting portion between the holding portion inner hole 34b2 and the pin portion inner hole 34b1. By inserting the base portion 24b, positioning in the axial center line direction is performed.

  At this time, the small diameter portion 24d of the base portion 24b is installed at a position corresponding to the communication path 38b of the holding portion 22b of the core pin 22 as shown in FIG. As a result, the communication passage 38b communicates with the internal passage of the cooling pipe 24a through the through hole 24b2 formed in the small diameter portion 24d.

  By attaching the pipe member 24 to the core pin 22 in this way, a double pipe structure including the pin portion inner hole 34b1 and the cooling pipe 24a is configured. At this time, as shown in FIG. 9, the large diameter portion 24c of the base portion 24b prevents the communication passage 38a and the communication passage 38b from short-circuiting each other. That is, the communication path 38a is configured to be able to communicate with the communication path 38b only through the internal path of the cooling pipe 24a. The internal passage of the cooling pipe 24a is an example of an implementation configuration corresponding to the “third shaft center hole” in the present invention.

  As shown in FIG. 10, the intermediate passage component member 26 includes pipe members 52 and 54 and a block body 56. The intermediate passage constituting member 26 corresponds to the “return passage constituting member” in the present invention, the pipe member 52 corresponds to the “second hollow member” in the present invention, and the pipe member 54 corresponds to the “third hollow member” in the present invention. It is an example of the implementation structure corresponding to "member."

  As shown in FIGS. 11 and 12, the pipe member 52 is configured in a cylindrical shape having a passage for circulating cooling water therein. As shown in FIG. 12, three annular grooves 52a, 52b, and 52c are formed on the outer peripheral surface on one end side in the longitudinal direction of the pipe member 52 (the right side in FIGS. 11 and 12). A male screw (not shown) is formed on the outer peripheral surface of the pipe member 52 on the other end side in the longitudinal direction (left side in FIG. 11). The passage inside the pipe member 52 is an example of an implementation configuration corresponding to the “fourth axial center hole” in the present invention.

  As shown in FIG. 12, the three annular grooves 52a, 52b, and 52c are arranged side by side in the longitudinal direction of the pipe member 52, and the bottom surface of the annular groove 52b disposed at the center is arranged inside the pipe member 52. A through hole 52d that penetrates to the passage is formed. As shown in FIG. 10, an O-ring 57 is attached to the annular grooves 52a and 52c arranged on both sides of the annular groove 52b. The through hole 52d is an example of an implementation configuration corresponding to the “dividing channel” in the present invention.

  As shown in FIG. 13, the pipe member 54 includes a cooling pipe 54a and a screw plug 54b attached integrally to one end of the cooling pipe 54a by brazing or the like. As shown in FIG. 10, the cooling pipe 54 a is configured to have an outer diameter smaller than the inner diameter of the pipe member 52. The internal passage of the cooling pipe 54a is an example of an implementation configuration corresponding to the “fifth shaft center hole” in the present invention.

  As shown in FIGS. 14 and 15, the block body 56 is configured as a rectangular parallelepiped, and has a through hole 56 a penetrating in the longitudinal direction (left and right direction in FIG. 14) and two orthogonal holes perpendicular to the through hole 56 a. 56b and 56c are formed.

  One end side of the through hole 56a (right side in FIG. 14), a portion corresponding to the space between the two orthogonal holes 56b and 56c in the through hole 56a, and the other end side of the through hole 56a (left side in FIG. 14) As shown, female threads 57a, 57b, and 57c are formed. The male screw of the pipe member 52 is threadedly engaged with the female screw 57a. The female screws 57b and 57c are configured as taper screws (gas screws). The screw plug 54b of the pipe member 54 is engaged with the female screw 57b, and the plug cap PC is engaged with the female screw 57c.

  Further, female screws are also formed in the orthogonal holes 56b and 56c as shown in FIG. The female screw is configured as a taper screw (gas screw). A pipe (not shown) from the cooling water supply source 70 is screw-engaged with the female screw.

  The pipe member 52 is screw-engaged with the female screw 57a on one end side of the through hole 56a of the block body 56 thus configured, and the pipe member 52 is attached to the block body 56, and the other end of the through hole 56a of the block body 56 The pipe member 54 is inserted from the side, and the screw plug 54 b is screw-engaged with the female screw 57 b to attach the pipe member 54 to the block body 56. Then, after the pipe member 54 is attached to the block body 56, the plug cap PC is threadedly engaged with the female screw 57c on the other end side of the through hole 56a.

  By attaching the screw plug 54b to the block body 56, as shown in FIG. 10, the orthogonal hole 56b and the orthogonal hole 56c are prevented from being short-circuited with each other. Further, in a state where the pipe members 52 and 54 are attached to the block body 56, as shown in FIG. 10, the tip of the cooling pipe 54a protrudes a predetermined length from the tip of the pipe member 52, and the cooling pipe A state in which 54 a has a predetermined gap with respect to the internal passage of the pipe member 52, that is, a double pipe structure is formed by the cooling pipe 54 a and the pipe member 52.

  Here, the annular opening formed at the tip of the pipe member 52 is sealed by brazing or the like, as shown in FIG. Thereby, the orthogonal hole 56b communicates only with the internal passage of the cooling pipe 54a, and the orthogonal hole 56c is an internal passage of the pipe member 52 (an annular passage constituted by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a). ) Through the through hole 52d. The brazing of the annular opening formed at the tip of the pipe member 52 also contributes to the reliable holding of the double pipe structure by the pipe member 52 of the cooling pipe 54a.

  As shown in FIG. 16, the intermediate passage constituting member 26 thus configured is connected to the core pin 22 by inserting the pipe member 52 into the base end side shaft center hole 34 a of the core pin 22. At this time, the intermediate passage constituting member 26 is set so that the through hole 52d of the pipe member 52 is at a position corresponding to the communication passage 36a of the holding portion 22b of the core pin 22.

  Here, since the O-ring 57 is attached to the annular grooves 52a and 52c of the pipe member 52, as shown in FIG. 16, the through hole 52d of the pipe member 52 has a base end side axial center hole 34a. It is possible to communicate only with the communication path 36a. Further, the internal passage of the cooling pipe 54a can communicate with only the communication passage 36b through the base end side shaft center hole 34a.

  As shown in FIG. 1, the core pin assembly 42 is inserted into the insertion hole 7 b, and is installed in the fixed die 6 with the pin portion protruding into the cavity Cab. At this time, the core pin assembly 42 is inserted through the through hole 25 formed in the holding portion 22b of the core pin assembly 20 and intersects the core pin assembly 20 as shown in FIG. It has become. The core pin assembly 42 is configured as a movable core pin assembly that can be inserted into and removed from the insertion hole 7b by a hydraulic cylinder (not shown).

  The tip of the pin portion of the core pin assembly 42 is in contact with the core pin 14 or is opposed to the core pin 14 with a slight gap. As a result, a hole that can be penetrated from the main oil gallery to the bearing surface of the support wall portion of the cylinder block is configured, and one of the lubricating oil supply passages for supplying the lubricating oil from the main oil gallery to the bearing surface is a cast molded product. The cylinder block is molded. The cast pin assembly 42 is an example of an implementation configuration corresponding to the “other cast pin device” in the present invention.

  As shown in FIG. 1, the core pin assembly 44 is inserted into the insertion hole 7 c and installed in the fixed die 6 with the pin portion protruding into the cavity Cab. That is, the other of the pair of bolt holes for fastening the bearing cap to the support wall portion of the cylinder block is formed by the pin portion.

  Next, the operation of the cored pin assembly 20 thus configured, in particular, the cooling water supplied from the cooling water supply source 70 to the pin part 22a of the cored pin 22 and recirculated from the pin part 22a to the cooling water supply source. The flow will be described.

  As shown in FIG. 18, the cooling water from the cooling water supply source 70 is supplied from the orthogonal hole 56b of the block body 56 to the through hole 56a via a pipe (not shown) (solid line arrow in FIG. 18). The cooling water supplied to the through hole 56a passes through the internal passage of the cooling pipe 54a of the pipe member 54 and enters the proximal end side axial center hole 34a of the holding portion 22b of the core pin 22 as shown in FIG. (A solid line arrow in FIG. 19).

  Here, the screw plug 54b is screw-engaged with the female screw 57b of the through-hole 56a, and the plug cap PC is screw-engaged with the female screw 57c of the through-hole 56a. All of the cooling water supplied to the hole 56a is supplied from the internal passage of the cooling pipe 54a to the base end side axial center hole 34a.

  As shown in FIG. 19, the cooling water supplied to the base end side shaft center hole 34a is supplied from the communication passage 36b to the side hole 32c (solid arrow in FIG. 19). Here, the gap between the pipe member 52 and the base end side shaft center hole 34a is sealed by an O-ring 57, and the annular opening formed at the tip of the pipe member 52 is sealed by brazing, Since the opening on the through hole 25 side of the base end side shaft center hole 34a is sealed by the plug cap PC, all the cooling water supplied to the base end side shaft center hole 34a is laterally transferred from the communication path 36b. It is supplied to the hole 32c.

  The opening on the base end 23c side of the side hole 32c and the opening on the curved surface 23f side of the communication path 36b are sealed by the plug cap PC as shown in FIG. The cooled water that flows is directed toward the pin portion 22a (the right side in FIG. 19).

  As shown in FIG. 20, the cooling water that has flowed toward the pin portion 22a through the side hole 32c is supplied to the holding portion inner hole 34b2 through the communication passage 38b (the solid line arrow on the left side in FIG. 20). The cooling water supplied to the holding portion inner hole 34b2 passes through the through hole 24b2 of the base portion 24b of the pipe member 24 and the internal passage of the cooling pipe 24a and is supplied to the pin portion inner hole 34b1 as shown in FIG. A solid line arrow in FIG. 20).

  Here, as shown in FIG. 20, the opening on the through hole 25 side of the holding portion inner hole 34b2 and the opening on the curved surface 23f side of the communication path 38b are sealed by the plug cap PC, and the holding portion inner hole 34b2 has a base portion. Since 24b is press-fitted, all of the cooling water supplied to the holding portion inner hole 34b2 is supplied to the pin portion inner hole 34b1 through the internal passage of the cooling pipe 24a.

  As shown in FIG. 20, the cooling water supplied to the pin portion inner hole 34b1 flows through an annular passage formed by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a (right broken arrow in FIG. 20). ). Thereby, cooling of the pin part 22a is performed. The annular passage is an example of an implementation configuration corresponding to the “first annular gap” in the present invention.

  Thus, the cooling water flowing through the annular passage constituted by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a is supplied to the side hole 32b via the communication passage 38a as shown in FIG. (The broken line arrow on the left side of FIG. 20). Here, since the opening on the curved surface 23e side of the communication passage 38a is sealed by the plug cap PC, the cooling water supplied to the side hole 32b is on the base end portion 23c side of the holding portion 22b (the left side in FIG. 20). )

  As shown in FIG. 19, the coolant flowing through the side hole 32b toward the base end portion 23c passes through the internal passage of the pipe member 52 via the communication passage 36a, the base end side axial center hole 34a, and the through hole 52d. (An annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a) (broken arrow in FIG. 19).

  Here, as shown in FIG. 19, the opening on the curved surface 23e side of the communication path 36a and the opening on the base end portion 23c side of the side hole 32b are sealed by the plug cap PC, and the pipe member 52 and the base end are sealed. Since the gap with the part side shaft center hole 34a is sealed by the O-ring 57, all the cooling water flowing through the side hole 32b passes through the communication path 36a, the base end side shaft center hole 34a, and the through hole 52d. It is supplied to the internal passage of the pipe member 52 (annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a). The internal passage of the pipe member 52 (an annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a) is an example of an implementation configuration corresponding to the “second annular gap” in the present invention.

  Then, the cooling water supplied to the internal passage of the pipe member 52 (the annular passage formed by the inner peripheral surface of the pipe member 52 and the outer peripheral surface of the cooling pipe 54a) is supplied to the through hole 56a as shown in FIG. Supplied and recirculated from the through hole 56a to the cooling water supply source 70 through the orthogonal hole 56c and a pipe (not shown) (broken line arrow in FIG. 18).

  In the present embodiment, the cooling water supplied from the cooling water supply source 70 passes from the internal passage of the cooling pipe 54a to the base end side shaft center hole 34a, the communication passage 36b, the side hole 32c, the communication passage 38b, and the holding portion. The cooling water supplied to the pin portion inner hole 34b1 through the hole 34b2, the through hole 24b2 and the internal passage of the cooling pipe 24a is supplied to the inner peripheral surface of the pin portion inner hole 34b1 and the cooling pipe 24a. Cooling water supply source 70 from the annular passage constituted by the outer peripheral surface through the communication passage 38 a, the side hole 32 b, the communication passage 36 a, the base end side shaft center hole 34 a, the through hole 52 d and the internal passage of the pipe member 52. However, the present invention is not limited to this.

  For example, the cooling water supplied from the cooling water supply source 70 is opposite to that of the present embodiment, that is, from the internal passage of the pipe member 52 to the through hole 52d, the base end side axial center hole 34a, the communication passage 36a, side. The cooling water supplied to the pin passage inner hole 34b1 is supplied to an annular passage formed by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a via the rectangular hole 32b and the communication passage 38a. Cooling water supply source through the internal passage of the pipe 24a, the through hole 24b2, the holding portion inner hole 34b2, the communication passage 38b, the side hole 32c, the communication passage 36b, the base end side axial center hole 34a and the internal passage of the cooling pipe 54a. It is good also as a structure which recirculates to 70.

  Alternatively, as shown in FIG. 21, in place of the cast pin 22 having the communication passages 36a and 36b, the communication passage 136a that connects the side hole 32b and the portion with the narrow inner diameter of the base end side axial center hole 34a. And a core pin 122 of a modified example having a side hole 32c and a communication passage 136b communicating with a portion having a large inner diameter in the base end side shaft center hole 34a. From the internal passage of the cooling pipe 54a through the base end side axial center hole 34a, the communication passage 136a, the side hole 32b, and the communication passage 38a, the cooling water is cooled to the inner peripheral surface of the pin portion inner hole 34b1. The cooling water supplied to the annular passage composed of the outer peripheral surface of the pipe 24a and thus supplied to the pin portion inner hole 34b1 is the inner passage of the cooling pipe 24a, the through hole 24b2, the holding portion inner hole 34b2, the communication passage 38b, side. Hole 32c, the communication passage 136 b, the base end shaft center hole 34a, may be configured to reflux cooling water supply source 70 through the internal passage of the through-hole 52d and the pipe member 52. The communication path 136a and the communication path 136 are examples of implementation configurations corresponding to the “third communication path” and the “fourth communication path” in the present invention, respectively.

  Further, in this case, the cooling water supplied from the cooling water supply source 70 passes through the internal passage of the pipe member 52, the through hole 52d, the base end side shaft center hole 34a, the communication passage 136b, the side hole 32c, and the communication passage 38b. The cooling water supplied to the pin portion inner hole 34b1 through the holding portion inner hole 34b2, the through hole 24b2 and the internal passage of the cooling pipe 24a is cooled with the inner peripheral surface of the pin portion inner hole 34b1. From the annular passage formed by the outer peripheral surface of the pipe 24a to the cooling water supply source 70 through the communication passage 38a, the side hole 32b, the communication passage 136a, the base end side axial center hole 34a, and the internal passage of the cooling pipe 54a. It is good also as a structure which recirculate | refluxs.

  Further, as shown in FIG. 22, instead of the cast pin 22 having the communication passages 38a and 38b, the communication passage 138a that connects the side hole 32b and the holding portion inner hole 34b2, and the side hole 32c and the inside of the pin portion. After adopting a modified core pin 222 having a communication passage 138b that communicates with the hole 34b1, the cooling water supplied from the cooling water supply source 70 is supplied to the base end side shaft from the internal passage of the cooling pipe 54a. Via the center hole 34a, the communication passage 36b, the side hole 32c and the communication passage 138b, the pin portion inner hole 34b1 is supplied to the annular passage formed by the inner peripheral surface of the pin portion inner hole 34b1 and the outer peripheral surface of the cooling pipe 24a. The cooling water supplied to the internal passage of the cooling pipe 24a, the through hole 24b2, the holding portion inner hole 34b2, the communication passage 138a, the side hole 32b, the communication passage 36a, the base end side shaft center hole 34a, Through the internal passage of the through hole 52d and the pipe member 52 may be configured to reflux cooling water supply source 70. The communication path 138a and the communication path 138b are examples of implementation configurations corresponding to the “first communication path” and the “second communication path” in the present invention, respectively.

  Further, in this case, the cooling water supplied from the cooling water supply source 70 passes from the internal passage of the pipe member 52 to the through hole 52d, the base end side shaft center hole 34a, the communication passage 36a, the side hole 32b, and the communication passage 138a. The cooling water supplied to the pin portion inner hole 34b1 through the holding portion inner hole 34b2, the through hole 24b2 and the internal passage of the cooling pipe 24a is cooled with the inner peripheral surface of the pin portion inner hole 34b1. The cooling water supply source 70 is connected via an annular passage constituted by the outer peripheral surface of the pipe 24a, the communication passage 138b, the side hole 32c, the communication passage 36b, the base end side axial center hole 34a, and the internal passage of the cooling pipe 54a. It is good also as a structure which recirculate | refluxs.

  In the present embodiment, the base portion 24b is configured as a cylindrical member having a substantially H-shaped cross-section along the major axis direction of the base portion 24b, but is not limited thereto. For example, as shown in FIG. 23, instead of the pipe member 24 having the base portion 24b, a modified pipe member 124 having a base portion 124b configured as a simple cylindrical member may be adopted. In this case, the side hole 32c and the internal passage of the cooling pipe 124a communicate with each other via the communication passage 38b and the holding portion inner hole 34b2.

  In the present embodiment, the pin portion 22a and the holding portion 22b are integrally formed. However, the pin portion 22a and the holding portion 22b may be formed separately and then integrated.

  In the present embodiment, the cross-sectional shape perpendicular to the axial center direction of the holding portion 22b is formed in an oval shape, but the present invention is not limited to this. For example, the cross-sectional shape may be an elliptical shape or a rectangular shape. Moreover, you may comprise in circular shape instead of these flat shapes.

  In the present embodiment, the side holes 32b and 32c are set to a depth that does not penetrate the connection end 23d, but the side holes 32b and 32c may be configured to penetrate the connection end 23d. In this case, the opening on the side of the connection end 23d of the side holes 32b and 32c may be sealed with the plug cap PC.

  In the present embodiment, the cast pin assembly 20 is applied to the formation of a bolt hole for fastening a bearing cap that is provided so as to intersect with a lubricating oil supply passage for supplying lubricating oil from the main oil gallery to the bearing surface. However, it is not limited to this. For example, the cast pin assembly 20 may be applied to other bolt holes and lubricating oil holes provided so as to intersect each other, a cavity for weight reduction, and the like.

  Although the present embodiment is configured as a casting apparatus for molding a cylinder block of an internal combustion engine, the present invention is not limited thereto, and any casting apparatus that molds using a core pin can be applied.

  This embodiment shows an example for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the present embodiment.

1 Casting equipment (casting equipment)
2 Mold (mold)
DESCRIPTION OF SYMBOLS 4 Movable type 6 Fixed type 6a Crank chamber shaping core 6b Bearing surface shaping core 7a Insertion hole 7b Insertion hole 7c Insertion hole 8 Movable core 10 Water jacket forming insert 12 Bore pin 14 Casting pin 20 Casting pin assembly (casting Punching pin device)
22 Casting pin (Casting pin)
22a Pin part (pin part)
22b Holding part (main part)
23a plane 23b plane 23c base end 23d connection side end 23e curved surface 23f curved surface 24 pipe member (passage component)
24a Cooling pipe (first hollow member)
24b Base part (support member)
24b1 Inner hole 24b2 Through hole 24c Large diameter part 24d Small diameter part 25 Through hole (through hole)
26 Intermediate passage component (reflux passage component)
32a Shaft center hole 32b Side hole (second passage)
32c Side hole (first passage)
34a Base end side shaft center hole (first shaft center hole)
34b Pin part side shaft center hole 34b1 Pin part inner hole (cooling passage)
34b2 Holding portion inner hole (second shaft center hole)
36a Communication path (4th communication path)
36b Communication path (third communication path)
38a Communication path (second communication path)
38b Communication path (first communication path)
42 Casting pin assembly (other casting pin assembly)
44 Casting pin assembly 52 Pipe member (second hollow member)
52a annular groove 52b annular groove 52c annular groove 52d through hole (dividing flow path)
54 Pipe member (third hollow member)
54a Cooling pipe 54b Screw plug 56 Block body 56a Through hole 56b Orthogonal hole 56c Orthogonal hole 57a Female screw 57b Female screw 57c Female screw 57 O-ring 70 Cooling water supply source (cooling water supply source)
Cab Cavity PC Plug Cap 124 Pipe member (passage component)
124b Base part (support member)
136a Communication path (third communication path)
136b Communication path (fourth communication path)
138a Communication path (first communication path)
138b Communication path (second communication path)
122 Cast Pin (Cast Pin)
222 Cast Pin (Cast Pin)

Claims (10)

A cast pin that is installed in a mold and forms a hole in a cast product,
A pin portion configured to project into the cavity of the mold; and
A main body configured to extend from one end of the pin portion in the long axis direction along the long axis direction of the pin portion in a direction opposite to the extending direction of the pin portion;
With
Inside the pin part, a cooling passage extending in the major axis direction of the pin part is provided,
The main body is formed with a through-hole penetrating in a direction intersecting with the extending direction of the main body, and the main body is formed in the long-axis direction on both sides of the through-hole. Extending first and second passages, and first and second communication passages communicating the cooling passage and the first and second passages, are provided,
Cooling water supplied from a cooling water supply source is supplied from one of the first passage and the second passage to the cooling passage through one of the first communication passage and the second communication passage, and the cooling passage The cooling water supplied to the coolant is recirculated from the other of the first communication passage and the second communication passage to the cooling water supply source through the other of the first passage and the second passage.
Cast pin. The main body has an axial center hole that is drilled so as to be connected to the cooling passage through the through hole from the base end on the side opposite to the tip on the side to which the pin is connected. And
The axial center hole includes a first axial center hole disposed near the base end portion with the through hole interposed therebetween, and a second axial central hole disposed near the distal end portion with the through hole interposed therebetween. Have
The first shaft center hole and the second shaft center hole are configured such that the opening on the through hole side is closed,
The first and second passages are perforated over a predetermined length from the base end,
The cooling water supplied to one of the first passage and the second passage is configured to be supplied to the cooling passage through one of the first communication passage, the second shaft center hole, and the second communication passage. And the cooling water supplied to the cooling passage is supplied to the other of the first passage and the second passage through the first communication passage, the second shaft center hole, and the other of the second communication passage. The core pin according to claim 1, wherein the core pin is configured to perform. The main body has an axial center hole that is drilled so as to be connected to the cooling passage through the through hole from the base end on the side opposite to the tip on the side to which the pin is connected. And
The axial center hole includes a first axial center hole disposed near the base end portion with the through hole interposed therebetween, and a second axial central hole disposed near the distal end portion with the through hole interposed therebetween. Have
The first shaft center hole and the second shaft center hole are configured such that the opening on the through hole side is closed,
The first and second passages are configured to be perforated over a predetermined length from the base end portion, and are configured to close the base end side,
Third and fourth communication passages that communicate the first shaft center hole with the first and second passages are further provided inside the main body portion,
Cooling water supplied from the cooling water supply source is supplied to one of the first passage and the second passage through one of the first shaft center hole, the third communication passage, and the fourth communication passage. The cooling water supplied from the cooling passage to the other of the first passage and the second passage is passed through the first shaft center hole, the third communication passage, and the other of the fourth communication passage. The cast pin according to claim 1, wherein the cast pin is configured to return to the cooling water supply source. The main body portion is configured to have a flat shape in which a cross-sectional shape perpendicular to the major axis direction of the pin portion has a longitudinal direction in an arrangement direction of the first passage, the through hole, and the second passage. Item 4. The cast pin according to any one of items 1 to 3. A cast pin device that is installed in a mold and forms a hole in a cast product,
The core pin according to any one of claims 1 to 4,
The cooling water supplied from the cooling water supply source is configured to be supplied to one of the first passage and the second passage, and is supplied from the cooling passage to the other of the first passage and the second passage. A reflux passage component configured to return the cooling water to be supplied to the cooling water supply source;
The cooling water supplied to one of the first passage and the second passage is configured to be supplied to the cooling passage through one of the first communication passage and the second communication passage, and the cooling passage A passage component configured to supply the cooling water supplied to the other of the first passage and the second passage through the other of the first communication passage and the second communication passage;
A cast pin device comprising: The passage component member includes a first hollow member having a third shaft center hole, and a support member that supports the first hollow member and is installed in the second shaft center hole.
The first hollow member is supported by the support member so that a first annular gap is formed between the first hollow member, the second shaft center hole and the cooling passage.
The third shaft center hole is configured to communicate with the first communication path,
The cast pin apparatus according to claim 5, wherein the first annular gap is configured to communicate with the second communication path. The reflux passage component includes a second hollow member configured to have a fourth shaft center hole and connected to the first shaft center hole, a fifth shaft center hole, and the fourth shaft center hole. A third hollow member configured to be inserted, and
The second hollow member has a branch channel that penetrates from the fourth axial center hole to the outer peripheral surface of the second hollow portion,
The third hollow member is configured to be disposed in the fourth shaft center hole with a second annular gap between the third hollow member and the fourth shaft center hole,
The fifth shaft center hole is configured to communicate with the third communication path,
The cast pin apparatus according to claim 5 or 6, wherein the second annular gap is configured to communicate with the fourth communication path via the branch flow path. A casting apparatus for casting an engine block member having a support portion capable of rotatably supporting a crankshaft,
A mold having a cavity for constituting the engine block member;
8. The method according to claim 5, wherein a part of the pin portion is installed in the mold so as to protrude into the cavity in order to form a bolt hole for fastening a bearing cap in the support portion. The described cast pin device;
A casting apparatus comprising:   In order to form a lubricating hole having an axial center line in a direction intersecting with the axial center line of the bolt hole for fastening the bearing cap in the support portion, the lubricating hole is inserted into the through hole of the core pin device and partly The casting apparatus according to claim 8, further comprising another cast pin device installed in the mold in a state of protruding in the cavity. The casting apparatus according to claim 9, wherein the other casting pin device is configured to have a casting pin configured to be cooled with cooling water.

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