JP2008150689A - Thermal spray masking member and thermal spray masking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal spray masking method where, even in a state where a ladder frame provided with a reinforcing rib is fitted to the side opposite to a cylinder head fitting part in a cylinder block, a thermal spray masking member can be easily inserted from the ladder frame side. <P>SOLUTION: In a state where a ladder frame 5 is fitted to the side opposite to a cylinder head fitting part 3 of a cylinder block 1 in a V type engine, a sprayed coating is formed on each inside face of cylinder bores 11, 13. At this time, a thermal spray masking member 25 is mounted from the opening on the side opposite to the cylinder block 1 in the ladder frame 5. Each edge part on the side opposite to the cylinder block 1 in the ladder frame 5 is provided with a reinforcing rib 23 projecting toward the inside, and, on the other hand, the thermal spray masking member 25 has a three-divided structure of the first parts 29, 31 located on the side of the reinforcing rib 23, and the second part inserted between the first parts 29, 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermal spray masking member and a thermal spray masking method for preventing the thermal spray coating from adhering to a portion different from the inner surface of a cylinder bore when a thermal spray coating is formed on the inner surface of a cylinder bore.

  The method of forming a thermal spray coating on the inner surface of the cylinder bore is a method in which an iron-based material is melted and sprayed as a spray to adhere to the inner surface of the bore, compared to the conventional method of casting a cast iron liner when casting an aluminum cylinder block. is there. At the time of thermal spraying, a thermal spray gun that ejects molten material from the tip is inserted into the cylinder, and the thermal spray gun is relatively moved in the axial direction while rotating relative to the cylinder.

  At this time, the spray during spraying may adhere to a portion other than the inner surface of the cylinder bore that requires spraying, such as in the crankcase on the opposite side of the cylinder head mounting portion of the cylinder block. Spray droplets adhering to parts that do not require spraying are attached by moving a distance away from the spray gun, so the adhesion is weak, so if the engine is assembled and operated as it is, it will fall off. The oil enters the engine oil and enters the sliding part such as the crankshaft, causing seizure.

For this reason, as described in, for example, Patent Document 1 below, a thermal spray masking member is attached to prevent the spray droplets from adhering to the cylinder head mounting surface and the crankcase inner surface, which are parts that do not require thermal spraying. And what is sprayed is known.
JP 2001-107216 A

  By the way, a ladder-shaped member called a ladder frame having a bearing portion for rotatingly supporting the journal portion of the crankshaft is attached to the end of the cylinder block opposite to the cylinder head mounting portion on the side of the crankcase. May increase strength.

  The ladder frame includes a peripheral wall joined to the end of the outer peripheral edge of the cylinder block, and a plurality of partition walls provided at positions corresponding to the journal portion of the crankshaft inside the peripheral wall, in order to further increase the strength. In some cases, reinforcing ribs projecting inward from the end of the peripheral wall opposite to the cylinder block may be provided.

  In order to prevent deformation of the cylinder block due to the influence of heat at the time of spraying when forming the above-mentioned sprayed coating on the cylinder bore inner surface for the cylinder block having a structure in which a ladder frame having a reinforcing rib as described above is attached, It is preferable to carry out with the ladder frame attached.

  However, when the ladder frame is attached to the cylinder block, when the masking member for preventing the adhesion of sprayed spray to the crankcase side including the ladder frame of the cylinder block is inserted from the ladder frame side and attached, the reinforcing rib Will be in the way, making it difficult to insert.

  Therefore, the present invention enables the thermal spray masking member to be easily inserted from the ladder frame side even when the ladder frame having the reinforcing rib is attached to the side opposite to the cylinder head mounting portion of the cylinder block. It is an object.

  In the present invention, a ladder frame having a bearing portion that rotatably supports the journal portion of the crankshaft is attached to an end portion of the cylinder block opposite to the cylinder head mounting portion, and the ladder frame is connected to an end of the outer peripheral edge of the cylinder block. And a partition wall provided at a position corresponding to the journal portion of the crankshaft on the inner side of the peripheral wall, and projecting inward from an end of the peripheral wall opposite to the cylinder block. The ladder frame on the side on which the reinforcing rib is provided in order to prevent the sprayed coating from adhering to the ladder frame side when the thermal spray coating is formed on the cylinder bore inner surface of the cylinder block. It is a thermal spray masking member used in the state of being inserted and installed from the opening of this, this thermal spray masking member, A first portion to be mounted along the peripheral wall of the serial corresponding to the reinforcing rib side, the most important characterized by being divided into a plurality of the second portion other than the first portion.

  According to this invention, the 1st site | part which mounts the thermal spray masking member used in the state inserted and installed from the opening part of the ladder frame of the side which provided the reinforcement rib along the surrounding wall of the side corresponding to a reinforcement rib. And the second part other than the first part are divided into a plurality of parts, so if the first part is attached first along the peripheral wall on the side corresponding to the reinforcing rib, the subsequent second part is When mounting, the reinforcing ribs do not get in the way, and the thermal spray masking member can be easily inserted from the side of the ladder frame provided with the reinforcing ribs.

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

  FIG. 1 is a perspective view of an aluminum alloy cylinder block 1 of an automotive V-type 6-cylinder engine according to a first embodiment of the present invention, and is a view of the cylinder block 1 opposite to a cylinder head mounting portion 3. A ladder frame 5 is attached to the lower part of 1. An oil pan (not shown) is mounted on the opposite side of the ladder frame 5 from the cylinder block 1.

  2 is a cross-sectional view taken along the line AA in FIG. 1. The cylinder block 1 described above includes three cylinder bores 11 respectively in the bank portion 7 on the left side and the bank portion 9 on the right side in FIG. , 13, and a sprayed coating is formed on the inner surfaces of the cylinder bores 11, 13.

  FIG. 3 is a perspective view of the ladder frame 5 as viewed from the side where the cylinder block 1 is mounted. The peripheral wall 15 joined to the outer peripheral edge of the cylinder block 1 and the crankshaft journal (not shown) inside the peripheral wall 15. And a plurality of partition walls 17 provided at positions corresponding to the portions.

  The peripheral wall 15 includes a short wall 19 positioned at both ends of the engine in the front-rear direction indicated by an arrow B in the figure, and a long wall 21 extending in a direction orthogonal to the short wall 19, and the end face of the short wall 19 on the cylinder block 1 side is provided. A bearing 19a that rotatably supports journal portions at both ends of the crankshaft (not shown) is provided. Corresponding to the above-described bearing portion 19a, the end face of the partition wall 17 on the cylinder block 1 side is also provided with a bearing portion 17a that rotatably supports the central journal portion of the crankshaft.

  Further, as shown in FIG. 2, the ladder frame 5 described above is a reinforcement projecting inward from an end portion (end portion on the lower side in FIG. 3) of the long wall 21 on the peripheral wall 15 opposite to the cylinder block 1. Ribs 23 are provided.

  As shown in FIG. 1 corresponding to the bearing portion 19a of the short wall 19 on the end surface of the cylinder block 1 facing the ladder frame 5, the bearing portion 1a corresponds to the bearing portion 17a of the partition wall 17 in FIG. As shown, bearing portions 1b are formed.

  4 shows a state in which a thermal spray masking member 25 made of an elastic material such as rubber is mounted in a space formed by the partition wall 17 in the ladder frame 5 corresponding to the crankcase side of the cylinder block 1 with respect to FIG. Show. In the illustrated example, the space in which the thermal spray masking member 25 is mounted corresponds to a portion including a space 27 between the short wall 19 on the front side of the paper surface in FIG. 3 and the partition wall 17 adjacent to the short wall 19. A thermal spray coating is formed on the two cylinder bores 11 and 13 located on the left and right in FIG.

  FIG. 5A is a perspective view from the cylinder block 1 side of the above-described thermal spray masking member 25, and FIG. 5B is a perspective view seen from the opposite side to FIG. The thermal spray masking member 25 includes first portions 29 and 31 positioned on both left and right sides in FIG. 4 with two dividing lines C and D extending vertically in FIG. , 31 has a three-part structure with the second portion 33 located between them.

  Next, the overall structure of the three-split thermal spray masking member 25 will be described in a state where the thermal spray masking member 25 is in close contact with each other as shown in FIGS. The thermal spray masking member 25 includes through holes 25a and 25b communicating with the pair of left and right cylinder bores 11 and 13 shown in FIG. Each of these through holes 25a, 25b has a continuous shape with no step between the respective opening portions in the communication connection portions with the cylinder bores 11, 13.

  Then, the opening peripheral edges 25c and 25d on the cylinder bores 11 and 13 side of the through holes 25a and 25b are brought into close contact with the lower peripheral edges of the cylinder bores 11 and 13, respectively. Further, the upper portions of the outer peripheral surfaces 25e and 25f opposite to the second portion 33 of the first portions 29 and 31 in FIG. 4 are in close contact with the inner peripheral surfaces 1c and 1d on the crankcase side of the cylinder block 1, respectively. The lower portions of the outer peripheral surfaces 25e and 25f in FIG. 4 are brought into close contact with the inner surfaces 21b and 21c of the long wall 21 of the ladder frame 5, respectively.

  Further, in the state where the above-described thermal spray masking member 25 is mounted as shown in FIG. 4, the lower side in FIG. 4 of the side surface 25i (surface on the front side in FIG. 4) of the thermal spray masking member 25 in the front-rear direction of the engine The upper part of the side surface 25 i is brought into close contact with the inner peripheral surface of the cylinder block 1 corresponding to the short wall 19 on the inner surface of the short wall 19 of the frame 5. Further, the lower side in FIG. 4 of the other side surface 25j of the thermal spray masking member 25 in the engine longitudinal direction corresponds to the partition wall 17 of the ladder frame 5, and the upper side of the side surface 25j corresponds to the partition wall 17. The cylinder block 1 is closely attached to the inner peripheral surface 1e (see FIG. 2) on the crankcase side.

  Further, as shown in FIG. 4, step portions 25g and 25h are formed at portions corresponding to the reinforcing rib 23 at the lower end portion in FIG. 4 of the first portions 29 and 31, and the step portions 25g and 25h are formed as the reinforcing ribs. 23 to be in contact with each other.

  As a result, as shown in FIG. 4, in a state where the thermal spray masking member 25 is attached to a portion corresponding to the space 27 of the ladder frame 5, the inner surface of the space in the crankcase of the cylinder block 1 including the space 27 is almost the same. The outer surface of the thermal spray masking member 25 comes into contact with the entire area.

  As shown in FIG. 5 (a), the opening peripheral edges 25c and 25d on the cylinder bores 11 and 13 side of the through holes 25a and 25b are not circular but arcuate. This is because a wall portion corresponding to the short wall 19 and the partition wall 17 of the ladder frame 5 exists at the opening position on the crankcase side.

  When mounting the thermal spray masking member 25 as described above on the cylinder block 1 and the ladder frame 5, first, the two first portions 29 and 31 are mounted sequentially from the opening on the opposite side of the ladder frame 5 from the cylinder block 1. After that, the second part 33 is mounted so as to be inserted between the first parts 29 and 31. At this time, since the first parts 29 and 31 to be mounted first are in a state in which the step portions 25g and 25h are placed on the reinforcing ribs 23 of the ladder frame 5, the mounting state can be easily maintained, and further in the mounted state. The second portion 33 can be easily inserted, so that the mounting workability of the thermal spray masking member 25 is improved.

  Thus, according to the present embodiment, the thermal spray masking member 25 is reinforced by dividing the thermal spray masking member 25 into three parts and attaching the first portions 29 and 31 on the side corresponding to the reinforcing ribs 23 first. It can be easily inserted from the side of the ladder frame 5 provided with the ribs 23.

  As shown in FIG. 4, the cylinder block 1 and the ladder frame 5 are installed on the work table 35 in a state where the thermal spray masking member 25 is mounted on the cylinder block 1 and the ladder frame 5 at a portion corresponding to the space 27 in FIG. To do. The thermal spray gun 37 is inserted through the upper opening of the cylinder bore 11 (13) opposite to the ladder frame 5, and the thermal spray gun 37 is moved in the axial direction while rotating in the cylinder bore 11 (13). 13) A sprayed coating is formed on the inner surface. Note that spraying guns 37 may be inserted into the cylinder bores 11 and 13 at the same time to perform spraying simultaneously.

  After the thermal spray masking member 25 is attached to the portion corresponding to the space 27 in FIG. 3 and the thermal spray coating is formed on the corresponding cylinder bores 11 and 13, the space between the partition walls 17 adjacent to the space 27 is similarly set. A thermal spray coating is formed on the corresponding cylinder bores 11 and 13 by mounting the thermal spray masking member 25.

  When the spray coating is formed on the inner surfaces of the cylinder bores 11 and 13 as described above, the spray masking member 25 is mounted on the ladder frame 5 side corresponding to the crank case of the cylinder bores 11 and 13, so that the crank case side It is possible to prevent the sprayed droplets from adhering to the inner surface.

  At this time, the thermal spray masking member 25 closes the opening portion peripheral edges 25c and 25d of the through holes 25a and 25b on the cylinder bores 11 and 13 side to the lower peripheral edge of the cylinder bores 11 and 13, thereby Invasion of spray droplets can be reliably prevented.

  The work table 35 is formed with an exhaust passage 35a for exhausting air from the cylinder bores 11 and 13 through the through holes 25a and 25b of the thermal spray masking member 25. The exhaust passage 35a is illustrated on the downstream side of the exhaust passage 35a. Not install an exhaust fan. By driving the exhaust fan, the sprayed spray that has not adhered to the wall surface together with the air inside the exhaust passage 35a is discharged to the outside.

  When exhausting the internal air as described above, each of the through holes 25a and 25b of the thermal spray masking member 25 has a continuous shape with no step between the opening portions in the communication connection portions with the cylinder bores 11 and 13. Therefore, the flow of exhaust gas becomes smooth, the deposition of sprayed spray at the boundary between the opening portions can be prevented, and the excess spray can be efficiently discharged to the outside.

  Further, the thermal spray masking member 25 includes outer peripheral surfaces 25e and 25f on the opposite side of the first portion 29 and 31 to the second portion 33, inner peripheral surfaces 1c and 1d on the crankcase side of the cylinder block 1, and a ladder frame. Since the entire area of the outer peripheral surface of the thermal spray masking member 25 is in close contact with the inner surface of the crankcase, such as in close contact with the inner surfaces 21b and 21c of the long wall 21, the deformation caused by the influence of heat during thermal spraying Can be prevented.

  FIG. 6 is a cross-sectional view corresponding to FIG. 4 showing a second embodiment of the present invention. The thermal spray masking member 25A of this embodiment is composed of a first part 29A, 31A located on the left and right sides in FIG. 6, and a second part 33A located between the first parts 29A, 31A. The division structure is the same as in the first embodiment.

  The difference from the first embodiment is that the cylinder block 1 side of the two dividing lines E and F for dividing into three is tapered surfaces Ea and Fa that are inclined outward. That is, a tapered portion that is tapered toward the cylinder block 1 side is provided on the cylinder block 1 side of the second portion 33A located in the center.

  Similarly to the first embodiment, the mounting order of the three-split thermal spray masking member 25 in this case is the first part 29A, 31A first, and then the second part between the first parts 29A, 31A. Insert site 33A. At this time, since the thermal spray masking member 25A is formed of an elastic body such as rubber, the tip of the tip of the second portion 33A is inserted into the first portion 29A, 31A. Both sides of the thick part are pushed by the first parts 29A and 31A and elastically deformed in the compressing direction.

  If the tip of the second portion 33A is pushed to the cylinder block 1 side and completely inserted between the first portions 29A and 31A, the second portion 33A is located between the first portions 29A and 31A. Can be prevented from falling, and thereafter the cylinder block 1 and the ladder frame 5 fitted with the thermal spray masking member 25A can be easily handled, for example, when moved to the work table 35.

  In the above-described embodiment, each of the through holes 25a and 25b of the thermal spray masking members 25 and 25A has a continuous shape with no step between the opening portions in the communication connection portions with the cylinder bores 11 and 13. However, the through holes 25a and 25b side in the opening portions may be larger than the cylinder bores 11 and 13 side. That is, you may set the above-mentioned opening part so that the through-holes 25a and 25b side may become the outer side from the same position or the same position with respect to the cylinder bores 11 and 13.

  As a result, the flow of exhaust gas during spraying becomes smoother than when the through holes 25a, 25b side in the opening portion is made smaller than the cylinder bores 11 and 13, and at the boundary between the opening portions. Therefore, it is possible to prevent the deposition of sprayed droplets, and it is possible to efficiently discharge surplus droplets to the outside.

  In the above-described embodiment, the thermal spray masking members 25 and 25A are divided into three parts. However, the second parts 33 and 33A located in the center are further divided in the left and right directions in FIGS. It may be divided or more.

  In the above-described embodiment, the V-type engine has been described. However, the inline engine is also provided with a ladder frame as shown in FIG. 3 on the side opposite to the cylinder head mounting portion of the cylinder block. The present invention can be applied.

1 is a perspective view of an aluminum alloy cylinder block of a V-type 6-cylinder engine for an automobile according to a first embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is the perspective view seen from the attachment side of the cylinder block of the ladder frame with which the cylinder block of FIG. 1 is mounted | worn. FIG. 3 is a cross-sectional view showing a state where a thermal spray masking member is mounted in a space on the ladder frame side of the cylinder block with respect to FIG. 2. (A) is a perspective view from the cylinder head side of a thermal-spraying masking member, (b) is the perspective view seen from the opposite side with respect to (a). It is sectional drawing corresponding to FIG. 4 which shows the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 3 Cylinder head cylinder head attachment part 5 Ladder frame 11, 13 Cylinder bore 15 Ladder frame peripheral wall 17 Ladder frame partition wall 17a, 19a Ladder frame bearing part 21b, 21c Inner surface of the peripheral wall (long wall) of the ladder frame 23 Ladder Reinforcing rib of frame 25, 25A Thermal spray masking member 25a, 25b Through hole 25e, 25f of thermal spray masking member communicating with cylinder bore First peripheral surface 29, 31, 29A, 31A First thermal masking member 33, 33A Second part of thermal spray masking member Ea, Fa Tapered surface (tapered part)

Claims (6)

  At the end of the cylinder block opposite to the cylinder head mounting portion, a ladder frame having a bearing portion that rotatably supports the journal portion of the crankshaft is mounted, and this ladder frame is joined to the end of the outer peripheral edge of the cylinder block. Reinforcing ribs each provided with a peripheral wall and a partition wall provided at a position corresponding to the journal portion of the crankshaft inside the peripheral wall and projecting inward from an end portion of the peripheral wall opposite to the cylinder block. When the thermal spray coating is formed on the cylinder bore inner surface of the cylinder block, in order to prevent the thermal spray coating from adhering to the ladder frame side, from the opening of the ladder frame on the side where the reinforcing rib is provided A thermal spray masking member used in a state of being inserted and mounted, on the peripheral wall on the side corresponding to the reinforcing rib First part and, thermal spray masking member characterized by being divided into a plurality of the second portion other than the first portion to be mounted me.   The reinforcing ribs are provided at positions opposite to each other at the end of the peripheral wall opposite to the cylinder block, and the first portion to be mounted along the peripheral wall on the side corresponding to both the reinforcing ribs, The thermal spray masking member according to claim 1, wherein the thermal spray masking member is divided into three or more parts with the second part located between one part.   Of the first part and the second part, at least a second part is made of an elastic body, and a taper portion that tapers toward the cylinder block side is formed on the cylinder block side of the second part. The thermal spray masking member according to claim 1, wherein the thermal spray masking member is provided.   The outer peripheral surfaces of the first part and the second part are brought into close contact with the inner surface of the cylinder block on the crankcase side including the ladder frame. Thermal spray masking member.   A through hole that communicates with the cylinder bore is provided inside the first portion and the second portion, and each opening portion of the communication connection portion between the through hole and the cylinder bore is arranged on the through hole side. The thermal spray masking member according to any one of claims 1 to 4, wherein the thermal spray masking member is set so as to be at the same position or outside the same position with respect to the cylinder bore side.   At the end of the cylinder block opposite to the cylinder head mounting portion, a ladder frame having a bearing portion that rotatably supports the journal portion of the crankshaft is mounted, and this ladder frame is joined to the end of the outer peripheral edge of the cylinder block. Reinforcing ribs each provided with a peripheral wall and a partition wall provided at a position corresponding to the journal portion of the crankshaft inside the peripheral wall and projecting inward from an end portion of the peripheral wall opposite to the cylinder block. When the thermal spray coating is formed on the cylinder bore inner surface of the cylinder block, the thermal spray masking member is inserted and installed from the opening of the ladder frame on the side where the reinforcing rib is provided. It is a thermal spray masking method for preventing adhesion of the thermal spray coating to the thermal spray masking member, The first portion to be mounted along the peripheral wall on the side corresponding to the reinforcing rib and the second portion other than the first portion are divided into a plurality of portions, and the divided thermal spray masking member is divided into the first portion. A thermal spray masking method comprising: mounting the second portion along the peripheral wall on the side corresponding to the reinforcing rib, and then performing masking by mounting the second portion.

Images