JP4983645B2 - Thermal spray cylinder block cleaning method and apparatus - Google Patents

Description

  In the present invention, a thermal spray coating is applied to the inner surface of the cylinder bore of the cylinder block in a state where a ladder frame having a bearing portion that rotatably supports the journal portion of the crankshaft is attached to the end of the cylinder block opposite to the cylinder head mounting portion. The present invention relates to a spraying cylinder block cleaning method and apparatus for cleaning a cylinder block after forming.

  The method of forming a thermal spray coating on the inner surface of a cylinder bore is a method in which an iron-based material is melted and sprayed in the form of 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 for ejecting molten material from the tip is inserted into the cylinder bore, and the thermal spray gun is relatively moved in the axial direction while rotating relative to the cylinder bore.

  At this time, spraying droplets or foreign objects such as soot and fume adhere to parts other than the inner surface of the cylinder bore that requires spraying, such as the inner surface of the crankcase opposite to the cylinder head mounting part of the cylinder block. If these foreign substances are left as they are, they will be mixed into the engine oil when the engine is running, and will enter the sliding parts such as the crankshaft and cause seizure.

For this reason, it is necessary to clean the cylinder block in order to remove the foreign matter described above. For example, in Patent Document 1 described below, as a method for cleaning a cylinder block, foreign matter (oil, moisture, etc.) adhering to the inner peripheral surface of the cylinder bore is cleaned by a water jet cleaning machine after boring the inner peripheral surface of the cylinder bore. It is described.
Japanese Patent Laying-Open No. 2005-307857 (paragraph 0058)

  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.

  When the above-mentioned sprayed coating is formed on the inner surface of the cylinder bore, the ladder frame is attached to prevent the cylinder block from being deformed due to the effect of heat during spraying. It is desirable to perform in the state.

  When the sprayed cylinder block having such a ladder frame is cleaned using a water jet cleaning machine as described above, the foreign matter adheres to the inner surface of the ladder frame. Similarly, when the ladder frame is attached to the cylinder block, the foreign matter enters and remains on the mating surface between the cylinder block and the ladder frame. Airtightness may be disturbed when assembling the block.

  For this reason, after the above-described cleaning operation, it is necessary to further clean the mating surfaces of the cylinder block and the ladder frame in a state where the ladder frame is removed from the cylinder block, resulting in deterioration of workability.

  Therefore, an object of the present invention is to suppress foreign matter from entering the mating surface between the cylinder block and the ladder frame when cleaning the cylinder block after thermal spraying.

  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 attached to the cylinder block. The spraying cylinder block cleaning method for cleaning the cylinder block after forming a sprayed coating on the cylinder bore inner surface of the cylinder block, and when cleaning the mating surfaces of the cylinder block and the ladder frame, The liquid is ejected from the inside of the cylinder block toward the mating surface by the liquid ejecting means, and the liquid is ejected from the outside of the cylinder block toward the mating surface by the liquid ejecting means. When cleaning the mating surface outside the cylinder block The injection pressure, the most important feature to be higher than the jetting pressure of the liquid at the time of cleaning of the mating surfaces of the inner cylinder block.

  According to the present invention, it is possible to suppress entry of foreign matter from the inside of the cylinder bore into the mating surface between the cylinder block and the ladder frame when cleaning the inner surface of the cylinder bore after spraying.

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

  FIG. 1 is a simplified front sectional view showing a spraying cylinder block cleaning apparatus according to an embodiment of the present invention. A cylinder block 1 shown in FIG. 1 is made of an aluminum alloy used in a V-type engine for automobiles, and a lower end portion 5 in FIG. For example, a ladder frame 7 as shown in a perspective view in FIG. 2 is attached. An oil pan (not shown) is attached to the end 9 of the ladder frame 7 opposite to the cylinder block 1.

  A crankcase is constituted by the ladder frame 7, the oil pan, and the skirt portion 11 below the cylinder block 1.

  The above-described ladder frame 7 includes a peripheral wall 15 that abuts on the outer peripheral edge of the cylinder block 1 and a plurality of partition walls 17 that are provided inside the peripheral wall 15 at positions corresponding to a journal portion of a crankshaft (not shown). Each has.

  The peripheral wall 15 includes a short wall 19 located at both ends of the engine in the front-rear direction indicated by an arrow B in FIG. 2 and a long wall 21 extending in a direction orthogonal to the short wall 19, and an end surface of the short wall 19 on the cylinder block 1 side. Are provided with bearing portions 19a that rotatably support journal portions at both ends of the crankshaft (not shown). 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, the above-described ladder frame 7 is provided with reinforcing ribs 23 that protrude inward from the end portion of the long wall 21 on the peripheral wall 15 opposite to the cylinder block 1 (the end portion on the lower side in FIG. 3).

  On the other hand, bearing portions 5 a and 5 b are formed on the end portion 5 facing the ladder frame 7 of the cylinder block 1 corresponding to the bearing portion 19 a of the short wall 19 and the bearing portion 17 a of the partition wall 17, respectively. .

  Therefore, the above-described ladder frame 7 is integrally provided with a bearing cap for rotatably supporting the crankshaft. By attaching such a ladder frame 7 to the cylinder block 3, the rigidity of the cylinder block 1 is increased. Yes.

  On the cylinder bore inner surface 25a of each cylinder bore 25 in the cylinder block 1, a thermal spray coating 27 made of an iron-based metal is formed. The thermal spray coating 27 is formed by spraying a spray of molten material toward the cylinder bore inner surface 25a in a state where a spray gun of a conventionally known thermal spray device (not shown) is rotated while moving in the cylinder bore 25 in the axial direction. To do.

  When forming the above-mentioned sprayed coating 27, in order to prevent the deformation | transformation of the cylinder block 1 by the influence of the heat | fever at the time of thermal spraying, it shall carry out in the state which attached the ladder frame 7. FIG.

  Here, foreign matter such as droplets, soot, and fumes during spraying adhere to the cylinder bore inner surface 25a and the crankcase inner surface (the inner surface of the cylinder block skirt portion 11 and the inner surface of the ladder frame 7) after the thermal spray coating 27 is formed. In order to remove these, the cylinder block 1 is cleaned as shown in FIG.

  The cylinder block 1 is fixedly installed on the device base 29, and the device base 29 is provided with a through hole 29 a that communicates with and opens in the cylinder block 1.

  An internal cleaning device 31 for cleaning the inner surface of the cylinder block 1 and the inner surface of the ladder frame 7, particularly the mating surface 30 between the cylinder block 1 and the ladder frame 7, is provided at a position below the through hole 29 a. Is installed. The internal cleaning device 31 is a water jet cleaning machine that injects, for example, water 35 that is a liquid from a nozzle 33 serving as a first injection unit at the front end, and a proximal end (lower end) of a water conduit 37 that includes the nozzle 33 at the front end (upper end). ) Side is connected to a pipe connection part 38 connected to a pump (not shown) via a water supply pipe 53, and to a rotation drive mechanism 39 for rotating the water conduit 37.

  The pipe connection portion 38 and the rotation drive mechanism 39 are attached to an attachment bracket 41 formed by bending a plate member. It is assumed that the mounting bracket 41 is mounted so as to be movable up and down with respect to the apparatus main body (not shown), that is, capable of moving toward and away from the cylinder block 1 on the apparatus base 29.

  The rotation drive mechanism 39 includes a motor 43 and a speed reduction mechanism 45 incorporating a gear driven by the motor 43, and the water conduit 37 rotates through the speed reduction mechanism 45 to which a driving force is transmitted from the motor 43. Note that a lead wire 47 is connected to the motor 41.

  The mounting bracket 41 includes a speed reduction mechanism mounting portion 41a for mounting the speed reduction mechanism 45 on the lower surface, a pipe mounting portion 41b for mounting the pipe connection portion 38 on the lower surface, and a connection portion 41c for connecting these mounting portions 41a and 41b to each other. The lower end of the water guide pipe 41d is rotatably inserted into a cylindrical part 41d provided to protrude from the upper surface of the speed reduction mechanism attaching part 41a.

  Then, the driven gear is fixed to the outer periphery near the lower end of the water guide pipe 41d, and the driving gear that is rotationally driven by the motor 43 is meshed with the driven gear, thereby reducing the speed reduction mechanism 45. Constitute.

  Further, a pipe connection portion 49 is provided below the cylinder portion 41 d of the speed reduction mechanism 45 so as to be arranged in parallel with the motor 43, and the lower end opening of the water conduit 37 can be rotated at the upper opening of the pipe connection portion 49. Connect to communication. At that time, a sealing material for preventing water leakage is interposed in the rotational connection portion between the pipe connection portion 49 and the water conduit 37. The pipe connecting portion 49 and the pipe connecting portion 38 are connected by a pipe 51.

  On the other hand, an external cleaning device 55 for cleaning the mating surface 30 between the cylinder block 1 and the ladder frame 7 from the outside is installed on the upper outer side of the cylinder block 1. The external cleaning device 55 has the same basic configuration as the internal cleaning device 31 described above, and corresponds to a configuration in which the internal cleaning device 31 is installed upside down. For this reason, with respect to the external cleaning device 55, the same constituent elements as those of the internal cleaning device 31 are denoted by the alphabetic capital letter “A” after the reference numerals attached to the internal cleaning device 31, and the description thereof is omitted.

  However, the external cleaning device 55 does not need a mechanism for moving in the vertical direction, and requires a mechanism for moving around the cylinder block 1. As the moving mechanism, for example, a guide rail may be provided around the upper portion of the cylinder block 1, and the mounting bracket 41A may be supported so as to be movable along the guide rail.

  The nozzle 33 that is the first ejecting means and the nozzle 33A that is the second ejecting means of the internal cleaning device 31 constitute a liquid ejecting means.

  Next, a cleaning method for the cylinder block 1 after the formation of the thermal spray coating by the thermal spray cylinder block cleaning device as described above will be described.

  The internal cleaning device 31 inserts the water conduit 37 into the cylinder block 1 from the through hole 29a of the device base 29, and drives the pump (not shown) while rotating the water conduit 37 by driving the motor 43 in this inserted state. To inject water from the nozzle 33. At this time, the rotation speed of the water conduit 37 is 100 rpm, and the injection pressure of water is 10 MPa.

  In this state, cleaning is performed by blowing water toward the inner surface of the cylinder block 1 and the inner surface of the ladder frame 7 while moving the internal cleaning device 31 in the vertical direction at a feed rate of 300 mm / min. At this time, the water injection direction of the nozzle 33 is a horizontal direction and is substantially perpendicular to the inner surface of the cylinder block 1 and the inner surface of the ladder frame 7.

  In particular, in this embodiment, when cleaning the mating surface 30 between the cylinder block 1 and the ladder frame 7, the water guide pipe 37 is rotated in a state where the vertical movement is stopped, and enters the gap between the mating surfaces 30. Remove any foreign matter that is coming out.

  After cleaning by the internal cleaning device 31, the external cleaning device 55 is operated to spray water sprayed from the nozzle 33 </ b> A from the outside to the mating surface 30 between the cylinder block 1 and the ladder frame 7. At this time, the water conduit 37 </ b> A moves the entire external cleaning device 55 around the cylinder block 1 while rotating at the same rotational speed (100 rpm) as the internal cleaning device 31.

  Here, the injection pressure of water by the external cleaning device 55 is set to 30 Mpa, which is higher than the injection pressure of the internal cleaning device 31.

  In this way, after the mating surface 30 of the cylinder block 1 and the ladder frame 7 is washed from the inside, the outside is also washed from the outside, and the washing pressure (water injection pressure) from the outside is washed from the inside. By setting the pressure higher than the pressure (water injection pressure), it is possible to push out some foreign matter entering the gap of the mating surface 30 by the inner cleaning from the outer side to the inner side, thereby avoiding foreign matter remaining on the mating surface 30. .

  Thereby, airtightness at the time of subsequent engine block assembly can be ensured as desired, and it can contribute to engine performance ensuring.

  The cleaning operation by the internal cleaning device 31 and the cleaning operation by the external cleaning device 55 are performed while the cleaning pressure from the outside (water injection pressure) is kept higher than the cleaning pressure from the inside (water injection pressure). You may do it at the same time.

  As a result, in the same manner as described above, a part of the foreign matter that enters the gap of the mating surface 30 by the inner cleaning can be pushed out from the outer side to the inner side by a high cleaning pressure, and the foreign matter remaining on the mating surface 30 can be avoided. By performing the inner cleaning and the outer cleaning at the same time, the working time can be shortened as compared with the case of performing the cleaning separately.

  In addition, the nozzle 33 as the first injection means is relatively rotated while being inserted into the cylinder block 1 from the crankcase side, and the liquid is injected, and the nozzle 33A as the second injection means is set to the outer periphery of the cylinder block 1. The inner cleaning and the outer cleaning can be performed simultaneously by ejecting the liquid while relatively moving on the side.

  At this time, the nozzle 33 as the first injection means is rotated at a fixed position with respect to the cylinder block 1, while the nozzle 33A as the second injection means is moved along the outer periphery of the cylinder block 1. Cleaning from the inside and the outside of the cylinder block 1 can be performed efficiently while the heavy cylinder block 1 is installed and fixed on the apparatus base 29.

  In the above-described embodiment, the water conduit 37 of the internal cleaning device 31 is rotated with respect to the cylinder block 1, but the cylinder block 1 side may be rotated without rotating the water conduit 37. Further, the external cleaning device 55 may be moved on the cylinder block 1 side instead of moving around the cylinder block 1.

It is the simplified front sectional view which shows the washing | cleaning apparatus of the thermal spray cylinder block concerning one Embodiment of this invention. It is a perspective view of the ladder frame attached to the cylinder block of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 3 Cylinder head attaching part 5 End part on the opposite side to the cylinder head attaching part of a cylinder block 7 Ladder frame 17a, 19a Ladder frame bearing part 25 Cylinder bore 25a Cylinder bore inner surface 27 Thermal spray coating 30 Matching of a cylinder block and a ladder frame Surface 33 nozzle (first ejecting means, liquid ejecting means)
33A nozzle (second ejection means, liquid ejection means)
35 Water (liquid)

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 attached, and the cylinder block is attached to the cylinder block in a state where the ladder frame is attached to the cylinder block. A spraying cylinder block cleaning method for cleaning the cylinder block after forming a sprayed coating on the inner surface of the cylinder bore, wherein when the mating surface of the cylinder block and the ladder frame is cleaned, The liquid jetting means sprays the liquid from the inside toward the mating surface and the liquid is jetted by the liquid jetting means toward the mating surface from the outside of the cylinder block for cleaning. Liquid jet pressure during cleaning of the outer mating surfaces The cleaning method of spraying a cylinder block, characterized by higher than the injection pressure of the liquid at the time of cleaning of the mating surfaces of the inner cylinder block.   The cleaning method for a thermal spray cylinder block according to claim 1, wherein the mating surface outside the cylinder block is washed after the mating surface inside the cylinder block is washed.   As the liquid ejecting means, two of the first ejecting means and the second ejecting means are used, and the mating surface inside the cylinder block by the first ejecting means and the alignment outside the cylinder block by the second ejecting means are used. 2. The method of cleaning a thermal spray cylinder block according to claim 1, wherein the surface is simultaneously cleaned.   As the liquid ejecting means, two of the first ejecting means and the second ejecting means are used, and liquid is ejected while the first ejecting means is relatively rotated while being inserted into the cylinder block from the crankcase side. Then, the mating surface inside the cylinder block is cleaned, and the second jetting unit is relatively moved on the outer peripheral side of the cylinder block, and the liquid is jetted to clean the mating surface outside the cylinder block. The method for cleaning a thermal spray cylinder block according to any one of claims 1 to 3.   The thermal spraying according to claim 4, wherein the first injection means is rotated at a fixed position with respect to the cylinder block while the second injection means is moved along the outer periphery of the cylinder block. Cylinder block cleaning method.   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 attached, and the cylinder block is attached to the cylinder block in a state where the ladder frame is attached to the cylinder block. A sprayed cylinder block cleaning device that forms a sprayed coating on the inner surface of the cylinder bore and cleans the cylinder block on which the sprayed coating has been formed, and includes the alignment of the cylinder block and the ladder frame from the inside of the cylinder block. A first jetting unit that jets and cleans the liquid toward the surface; and a second jetting unit that jets and cleans the liquid from the outside of the cylinder block toward the mating surface of the cylinder block and the ladder frame. And the liquid injection pressure by the second injection means is the first injection means. It is set higher than the injection pressure of the liquid by injection means spraying the cylinder block cleaning apparatus according to claim.

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