JP5529654B2 - Dummy head for cylinder block processing - Google Patents

Description

  The present invention relates to a cylinder block processing dummy head attached to a cylinder head mounting surface when processing a cylinder bore or the like in a cylinder block.

  In general, cylinder bores formed in the cylinder blocks that make up the engine are finished with a honing process to ensure the accuracy of roundness, and then the cylinder head is bolted via a gasket on the cylinder head mounting surface. It is assembled and fixed by fastening.

  However, even if the roundness of the cylinder bore is increased by finishing, when the cylinder head is assembled and fixed by bolt fastening on the cylinder head mounting surface of the finished cylinder block, A pressing force is applied to the cylinder head mounting surface from the cylinder head through a gasket, and a reaction force against the bolt tension is generated in the cylinder block to which the bolt is screwed together with the bolt fastening, and various stresses are applied to each part of the cylinder block. Occurs. In particular, when stress is biased in the cylinder bore portion forming the cylinder bore, the portion is deformed and the roundness of the cylinder bore is lowered.

  The reduction in the roundness of the cylinder bore causes an increase in sliding resistance of the piston ring that reciprocates in sliding contact with the cylinder bore, causing deterioration in engine performance and fuel consumption. Moreover, there is a concern that an excessive gap is generated between the cylinder bore and the piston ring, leading to deterioration of oil consumption.

  Therefore, when finishing the cylinder bore, the cylinder block machining dummy head is assembled to the cylinder head mounting surface of the cylinder block with bolts, and the cylinder load is loaded with the same load as when the cylinder head is actually assembled to the cylinder block. When the cylinder bore is deformed by applying stress to the block, and the cylinder bore is finished with this deformation applied, the cylinder bore will have the specified accuracy when the cylinder head is installed and the engine is assembled. It is trying to be roundness of.

  This method is disclosed in Patent Document 1, for example, and as shown in FIG. 15, a cylinder block machining dummy head 115 used in place of the cylinder head is made of the same material and shape as the cylinder head, and the cylinder block 111 is used. It is formed in a plate shape having a through hole 116 and a bolt hole 117 that are slightly larger in diameter than the cylinder bore 113. A gasket 118 is interposed between the dummy head 115 and the cylinder head mounting surface 114 of the cylinder block 111, and the cylinder block 111 is deformed by being screwed and fastened to the head bolt hole 114a with a bolt 119. A machining tool such as a honing head is inserted through the hole 116 to finish the cylinder bore 113.

  In this method, since the gasket 118 is crushed and deteriorated as the number of uses increases, it is necessary to replace the gasket 118 in order to give a stable deformation to the cylinder bore 113 in mass production. In addition, the cost increases.

  As a countermeasure, a dummy head having a bead portion facing the cylinder bore periphery of the cylinder head has been proposed. This dummy head will be described with reference to FIGS. 16 and 17 are a perspective view and a bottom view of the dummy head 120, and FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII in FIG. 17 showing an outline of a state in which the dummy head 120 is attached to the cylinder head 111.

  As shown in FIGS. 16 and 17, the dummy head 120 includes a rectangular flat plate-like dummy head main body 121, and a through hole 122 corresponding to the cylinder bore 113 of the cylinder block 111 is formed in the dummy head main body 121. A bolt insertion hole 123 is provided around the periphery of the bolt. The through-hole 122 is larger in diameter than the inner diameter of the cylinder bore 113, and a machining tool such as a honing head is inserted during finishing.

  An annular recess 124 is formed on the periphery of the through hole 122 provided in the dummy head body 121 on the cylinder block 111 side, and an annular bead portion 125 projecting toward the top surface 112a of the cylinder bore portion 112 is formed in the recess 124. The contact surface 125a is provided in a state protruding from the dummy head main body 121.

  When the dummy head 120 is set on the cylinder head mounting surface 114 of the cylinder block 111 and bolted, the contact surface 125a of the bead portion 125 protruding from the dummy head main body 121 becomes the cylinder bore portion 112 as shown in FIG. The top surface 112 a of the cylinder, that is, the periphery of the cylinder bore 113 is pushed in, and the bead portion 125 is pushed by the cylinder block 111. At this time, the dummy head main body 121 is elastically deformed upward by the formation of the bead portion 124 to control the pushing force.

  Thus, when the bead portion 125 is provided on the dummy head main body 121, even if there is a manufacturing error in the protruding amount of the bead portion 125 protruding from the cylinder head main body 121, a desired pushing force is applied to the cylinder bore portion 112 and the cylinder bore 113. That is, the deformation of the cylinder bore 113 with the actual cylinder head and gasket attached to the cylinder block 111 can be obtained.

JP 2004-243514 A

  According to the above-mentioned Patent Document 1, when the dummy head 120 is set on the cylinder head mounting surface 114 of the cylinder block 111 and the bead portion 125 gives the pushing force of the peripheral edge of the cylinder bore portion 112, that is, the cylinder bore 113, the dummy head body 121 is pushed by the bead part 125 and is elastically deformed to control the pushing force to the cylinder block 111.

  However, when the cylinder head is attached to the cylinder block by actual bolt fastening, various stresses are generated in the cylinder bore portion 112 by bolt fastening, and unevenly distributed in each circumferential portion of the top surface 112a of the cylinder bore portion 112 that becomes the peripheral edge of the cylinder bore 113. And the distortion changes complicatedly.

  The strain deformation of the top surface 112a of the cylinder bore portion 112 is extremely fine, and is complicatedly distributed and unevenly distributed. Further, this deformation is variously changed depending on the bolt fastening force and the specifications of the engine or the like even in the same cylinder block.

  In order to apply a pressing force corresponding to each portion of the top surface 112a of the variously deformed and deformed cylinder bore portion 112, the contact surface 125a of the bead portion 125 that contacts the top surface 112a of the variously deformed and deformed cylinder bore portion 112. Needs to be processed into a fine and variable surface according to the cylinder head mounting surface 112a of the cylinder bore 112. This fine processing is extremely troublesome and requires a lot of processing costs and skill of workers, and reproducibility by the processing is extremely difficult.

  Accordingly, an object of the present invention made in view of the above point is to provide a cylinder block machining dummy head which can easily adjust the pushing force to the cylinder head more easily and at a low machining cost and has excellent reproducibility. .

  According to the first aspect of the invention for achieving the above object, the top surface of the cylinder bore portion is assembled by bolt fastening to the cylinder head mounting surface of the cylinder block instead of the cylinder head when machining the cylinder bore formed in the cylinder bore portion of the cylinder block. In the cylinder block processing dummy head that deforms the cylinder bore by pressing the bolt, a bolt member that is screwed into a head bolt hole for fastening the cylinder head of the cylinder block, a mating surface that faces the cylinder head mounting surface, and a cylinder mounting A dummy head main body having a plate-like shape having a fastening surface opposite to the surface, a bolt insertion hole for inserting the bolt member for fastening the bolt to the cylinder head mounting surface, and a through hole opening corresponding to the cylinder bore; The sleeve is fixed to the fastening surface of the dummy head body. An annular flange portion fastened by a bolt for use, and a cylindrical portion having a base end coupled to the flange portion and fitted into the through-hole and having an annular bore contact surface that presses the top surface of the cylinder bore portion at the distal end And a deformation control section for forming a portion having a different thickness of the flange portion in a part of the flange portion of the bore pressing sleeve.

  According to this, by changing the thickness of the flange portion locally or partially by forming the deformation control portion, the elastic deformation over the flange portion of the pushing sleeve, the cylindrical portion, and the continuous portion of the flange portion and the cylindrical portion. The region and the amount of elastic deformation can be partially adjusted, and the pushing force for pushing the top surface of the cylinder bore part and the pushing amount of the top surface are adjusted according to a desired portion or a predetermined range over the entire circumference in the circumferential direction of the top surface. Can do.

  Accordingly, even when the pushing force and pushing amount of the cylinder bore part in the state where the cylinder head and the gasket are actually attached to the cylinder block are partially different depending on the circumferential part of the annular top surface, the deformation control part is appropriately set. By setting, the exact pushing force to the cylinder head can be easily adjusted. Thereby, the local deformation | transformation of a cylinder bore part can be prevented and the deformation | transformation of an ideal cylinder bore can be obtained. The formation of the deformation control part that partially varies the thickness of the flange part can be formed at a low machining cost by relatively simple machining, and the same machining by machining is easy and reproducible. Excellent.

  According to a second aspect of the present invention, in the cylinder block processing dummy head according to the first aspect, the bore contact surface of the cylindrical portion protrudes toward the cylinder bore portion side of the cylinder block and continues along the circumferential direction of the cylindrical portion. It is characterized by a convex shape having a top end.

  According to this, by changing the position of the top end of the bore contact surface that abuts against the top surface of the cylinder bore portion locally or partially in the radial direction of the cylindrical portion, the elastic deformation region in the radial direction of the cylinder bore portion and The elastic deformation amount can be partially adjusted, and an ideal cylinder bore deformation can be obtained. The bore contact surface can be formed by relatively simple machining, and the same machining by machining is easy and excellent in reproducibility.

  According to a third aspect of the present invention, in the cylinder block processing dummy head according to the first or second aspect, the deformation control portion is a groove-shaped or U-shaped notch formed on a top surface of the flange portion. It is characterized by that.

  According to a fourth aspect of the present invention, in the cylinder block processing dummy head according to the first or second aspect, the deformation control unit has a connection portion between the flange portion and the cylindrical portion along a corner portion of the connection portion. It is characterized by chamfering.

  According to a fifth aspect of the present invention, in the cylinder block processing dummy head according to the first or second aspect, the deformation control unit has a cross section of a connecting portion between the flange portion and the cylindrical portion along a corner portion of the connecting portion. It is a notch formed by notching in an L shape.

  Each of the third to fifth embodiments exemplifies a specific shape of the deformation control unit that partially varies the thickness of the flange portion. The deformation control unit is reduced by relatively simple machining. It can be easily formed at a processing cost and has excellent reproducibility.

  A sixth aspect of the present invention is the cylinder block processing dummy head according to any one of the first to fifth aspects, wherein the cylinder portion is formed from the mating surface of the dummy head body in a state in which the pushing sleeve is attached to the dummy head body. The bore contact surface of the projection protrudes.

  According to this, since the bore contact surface of the cylindrical portion protrudes from the mating surface of the dummy head body when the pushing sleeve is attached to the dummy head body, it is possible to reliably apply the pushing force to the top surface of the cylinder bore portion. it can.

  The invention of claim 7 is the cylinder block processing dummy head according to any one of claims 1 to 6, wherein the dummy head main body has a plurality of through holes corresponding to a plurality of cylinder bores, A bore pushing sleeve is arranged independently for each through hole.

  According to this, by making each pushing sleeve detachable corresponding to each cylinder bore, the pushing sleeves function without interfering with each other, and the deformation control portion of each pushing sleeve and the bore contact surface Adjustment is facilitated, and when the pushing sleeve is worn, only the pushing sleeve can be replaced, and a cost reduction can be achieved as compared with the case where the entire dummy head is replaced.

  According to the present invention, the elastic deformation region and the amount of elastic deformation of the pushing sleeve can be partially adjusted by the formation of the deformation control portion, and the pushing force and the pushing amount of the top surface of the cylinder bore portion are adjusted in the circumferential direction of the top surface. It can be adjusted according to a desired portion or a predetermined range over the circumference. Accordingly, by appropriately setting the deformation control unit, local deformation of the cylinder bore portion can be prevented, and ideal cylinder bore deformation can be obtained. Formation of the deformation control unit that partially varies the thickness of the flange portion can be formed at a low processing cost by relatively simple machining, and has excellent reproducibility.

It is a perspective view of the dummy head and cylinder block which show the outline | summary of embodiment of this invention. It is a disassembled perspective view of a dummy head. It is a top view of a dummy head main body. It is the IV-IV sectional view taken on the line of FIG. It is a top view of the sleeve for bore pushing. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. FIG. 4 is a cross-sectional view taken along the line VII-VII in FIG. 3, showing an outline of a combined state of the dummy head body and the bore pushing sleeve. It is the VIII-VIII sectional view taken on the line of FIG. 1 which shows the attachment state of a dummy head. It is a schematic explanatory drawing of a deformation | transformation control part, (a) is principal part sectional drawing of a pushing sleeve, (b) is principal part sectional perspective view of a pushing sleeve. It is a schematic explanatory drawing of a deformation | transformation control part, (a) is principal part sectional drawing of a pushing sleeve, (b) is principal part sectional perspective view of a pushing sleeve. It is a schematic explanatory drawing of a deformation | transformation control part, (a) is principal part sectional drawing of a pushing sleeve, (b) is principal part sectional perspective view of a pushing sleeve. It is explanatory drawing of the bore contact surface of a cylindrical part, (a) is sectional drawing of the front-end | tip of a cylindrical part, (b) is action explanatory drawing. It is explanatory drawing of the bore contact surface of a cylindrical part, (a) is sectional drawing of the front-end | tip of a cylindrical part, (b) is action explanatory drawing. It is explanatory drawing of the bore contact surface of a cylindrical part, (a) is sectional drawing of the front-end | tip of a cylindrical part, (b) is action explanatory drawing. It is explanatory drawing of the conventional dummy head. It is a perspective view of the conventional dummy head. It is a bottom view of the dummy head shown in FIG. It is the XVIII-XVIII sectional view taken on the line of FIG. 17 which shows the outline | summary of the state in which the dummy head was attached to the cylinder block.

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

  1 is a perspective view showing an outline of a cylinder block processing dummy head and cylinder block, FIG. 2 is an exploded perspective view of the dummy head, FIG. 3 is a plan view of the dummy head body, and FIG. 4 is a IV-IV line in FIG. FIG. 5 is a plan view of the bore pushing sleeve, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII in FIG. It is line sectional drawing.

  Prior to the description of the cylinder block machining dummy head 1, an outline of the cylinder block 100 to which the dummy head 1 is attached when the cylinder bore is finished by honing or the like will be described with reference to FIG.

  The cylinder block 100 is an open deck type, and in this embodiment, a cylindrical cylinder bore portion 102 in which three cylinder bores 101 are formed is integrally formed in parallel, and the outer periphery of the cylinder bore portion 102 is formed with a water jacket 103. The cylinder outer wall 104 is interposed and surrounded by the cylinder outer wall portion 104, and the cylinder outer wall 104 is integrally coupled to the cylinder bore portion 102 via a crankcase portion 107 constituting the bottom portion of the water jacket 103. A cylinder head mounting surface 105 to which the cylinder head is mounted is formed by a top surface 102a of the cylinder bore portion 102 and a top surface 104a of the cylinder outer wall portion 104 with a gasket (not shown) interposed therebetween.

  The water jacket 103 is formed in a deep groove shape formed between the top surface 102 a of the cylinder bore portion 102 and the top surface 104 a of the cylinder outer wall 104. On the other hand, a plurality of head bolt holes 106 are formed in the cylinder outer wall 104 to which a head bolt for fixing a cylinder head (not shown) to the cylinder head mounting surface 105 is screwed. The head bolt holes 106 are provided in the vicinity of the corners of the cylinder block 100 around the water jacket 103 and between the cylinder bores 102. That is, a head bolt hole 106 is disposed so as to surround each cylinder bore portion 102 and is formed in the top surface 104a of the cylinder outer wall 104 so as to be perforated, and a screw (not shown) is formed at the tip of the head bolt hole 106 away from the top surface 104a. Part is formed.

  The dummy head 1 is shown in a perspective view in FIG. 1 and in an exploded perspective view in FIG. 2, a dummy head main body 10 having through holes 15 corresponding to the cylinder bores 101 of the cylinder block 100, and a dummy head main body 10. A bore pushing sleeve 20 is provided in each through hole 15.

  The dummy head main body 10 is in contact with the cylinder head mounting surface 105 in a state of being mounted on the cylinder block 100 as shown in FIG. 2 and as shown in a plan view in FIG. 3 and a sectional view taken along line IV-IV in FIG. And a clamping surface 12 opposite to the cylinder block 100, and is formed in a rectangular plate shape having a thickness of 10h.

  The dummy head body 10 is provided with three through holes 15 corresponding to the cylinder bores 101 of the cylinder block 100, and further, bolt insertion holes 13 for inserting bolt members 18 corresponding to the head bolt holes 106 are formed. Has been.

  Each through hole 15 of the dummy head body 10 has an inner diameter into which a cylindrical portion 21 of a bore pushing sleeve 20 described later can be fitted. On the fastening surface 12, an annular range surrounding the through-hole 15 is a flange portion contact range where the flange portion 25 of the bore pushing sleeve 20 contacts. The flange contact area is indicated by hatching 14 in FIG.

  A plurality of sleeve fixing screw holes 16 are provided around each through hole 15 in the flange contact area 14, and in this embodiment, each through hole 15 is provided with four sleeve fixing screw holes 16 and two sleeve fixing knock pin holes 17. Is formed. A cylindrical boss portion 19 is provided on the fastening surface 12 side of the dummy head main body 10 corresponding to the bolt insertion hole 13.

  As shown in FIG. 2, the bore pushing sleeve 20 includes a cylindrical portion 21 and a base end 21a side of the cylindrical portion 21 as shown in a plan view in FIG. 5 and a sectional view taken along line VI-VI in FIG. The cylindrical portion 21 includes a flange portion 25 provided on the outer peripheral surface 22 that can be inserted into the through hole 15 of the dummy head body 10 and the cylinder bore 101 after finishing. Cylinder bore processing tool, for example, a cylindrical shape with an inner peripheral surface 23 having an inner diameter dimension that allows insertion of a honing head or the like, and in contact with the top surface 102a of the cylinder bore portion 102 in an annular shape over the entire circumference A bore contact surface 24 having a top end 24a is formed.

  The flange portion 25 has an inner peripheral surface 26 and an outer peripheral surface 27 having an inner diameter dimension that is continuous with the inner peripheral surface 23 of the cylindrical portion 21. The inner peripheral edge is continuous with the edge of the inner peripheral surface 26, and the outer peripheral edge is the outer peripheral surface. 27 is a planar ring that is continuous with the end edge 27 of the dummy head main body 10, and is formed on the fastening surface 12 of the dummy head body 10. The outer peripheral edge is formed in the shape of a circular disk having a thickness of 25 h, and has a flat annular top surface 30 that is continuous with the top edge of the outer peripheral surface 27. The dimension from the contact surface 28 of the flange portion 25 to the bore contact surface 24 of the cylindrical portion 21, more specifically the top end 24 a, that is, the axial size 21 h of the cylindrical portion 21 is larger than the thickness 10 h of the dummy head body 10. Is set.

  A flange fixing bolt through hole 31 is formed in the flange portion 25 corresponding to the sleeve fixing screw hole 16 formed in the dummy head main body 10, and a knock pin hole 32 is formed corresponding to the sleeve fixing knock pin hole 17. The

  In each of the bore pushing sleeves 20, the cylindrical portion 21 is fitted into each through hole 15 of the dummy head body 10 so that the abutting surface 28 of the flange portion 25 abuts on the flange abutting range 14, and each sleeve fixing sleeve 20 is fixed. The screw holes 16 and the sleeve fixing knock pin holes 17, the sleeve fixing bolt through holes 31 and the knock pin holes 32 are relatively positioned, and the respective pressing sleeves 20 are positioned relative to the dummy head body 10.

  Further, a knock pin 38 is press-fitted into the corresponding knock pin hole 32 of each bore pushing sleeve 20 and the sleeve fixing knock pin hole 17 of the dummy head body 10 and is inserted from the sleeve fixing bolt through hole 31 to be a screw hole for fixing the sleeve. The bore pressing sleeve 20 is fixed to the dummy head main body 10 by a sleeve fixing bolt 39 that is screwed onto the dummy head main body 10. When adjacent flange pushing sleeves 20 come close to each other and the flange portions 25 interfere with each other, a notch 33 is formed on the outer periphery of the flange portion 25 as necessary to avoid mutual interference.

  In a state where the pushing sleeve 20 is attached to the dummy head main body 10, as shown in FIG. 7 as a sectional view taken along the line VII-VII of FIG. 3, the contact surface of the flange portion 25 is more than the thickness 10h of the dummy head main body 10. Since the dimension from 28 to the top end 24a of the bore contact part 24 of the cylindrical part 21, that is, the axial dimension 21h of the cylindrical part 21, is set large, the difference (21h-10h) is the mating surface 11 of the dummy head body 10. A projecting portion from the bore contact surface 24 of the cylindrical portion 21 is formed as a step 24h. In this way, by projecting the bore contact surface 24 of the cylindrical portion 21 from the mating surface 11 of the dummy head body 10 in a state where the pushing sleeve 20 is attached to the dummy head body 10, the top surface 102a of the cylinder bore portion 102 is reliably secured. The pushing force P can be applied to the.

  The above-mentioned dummy head 1 is set on the cylinder head mounting surface 105 of the cylinder block 100, and is inserted into the bolt insertion hole 13 of the boss portion 19 and the dummy head body 10 and screwed into the head bolt hole 106. The dummy head 1 is fastened to the cylinder block 100. As a result, as shown in FIG. 8, the top end 24 a of the bore contact portion 24 presses against the top surface 102 a of the cylinder bore portion 102, and a pushing force P is applied to the cylinder bore portion 102 to elastically deform the cylinder bore portion 102. On the other hand, the bore contact surface 24 is pushed by the drag F of the cylinder bore portion 102. At this time, the pushing sleeve 20 is in a range from the flange portion 25 connected to the dummy head body 10 by the sleeve fixing bolt 35 and the knock pin 34 to the top end 24a of the bore contact surface 24 of the cylindrical portion 21, particularly the flange portion 25 and The periphery of the corner portion 29 that is a continuous portion of the cylindrical portion 21 is elastically deformed upward as indicated by a virtual line 29a to control the drag F of the cylinder bore portion 102.

  Thus, even if there is an error such as manufacturing variation in the protrusion amount of the bore contact surface 24 protruding from the mating surface 11 of the dummy head body 10, that is, the step 24h, the cylinder bore 101 is deformed, that is, actually the cylinder head and the gasket. The cylinder block 100 can be easily deformed, particularly the cylinder bore 101 can be easily deformed.

  Further, as shown in FIG. 8, the bore contact portion 24 is pressed against the cylinder bore portion 102, and the flange portion 25, the cylindrical portion 21, the periphery of the corner portion 29 that is a continuous portion of the flange portion 25 and the cylindrical portion 21, and the like. Is elastically deformed to control the deformation of the cylinder bore 101, and the elastic deformation region is wide, and the deformation amount of the cylinder bore portion 102, and hence the deformation amount of the cylinder bore 101 is within an allowable range regardless of the size of the step 24h. Can be set.

  Furthermore, the flange portion 25, the cylindrical portion 21, the flange portion 25, and the cylindrical portion are adjusted by partially adjusting the rigidity of the push sleeve 20 by partially changing the thickness 25h of the flange portion 25 in the push sleeve 20. A deformation control unit for adjusting the elastic deformation amount of the continuous portion 21 is formed. An example of the deformation control unit will be described with reference to FIGS.

  9A shows a cross-sectional view of the main part of the pushing sleeve 20, and FIG. 9B shows a cross-sectional perspective view of the main part of the sleeve 20. As shown in FIG. The deformation control unit 35 is formed by cutting out a groove shape or a U-shape that extends from the surface to the outer peripheral surface 27. The formation of the deformation control unit 35 causes the thickness 25h of the flange portion 25 to be locally or partially different, that is, to decrease and to elastically deform the flange portion 25, the cylindrical portion 21, and the continuous portion of the flange 25 and the cylindrical portion 21. The region and the amount of elastic deformation can be partially adjusted, and the pushing force P of the top surface 102a of the cylinder bore portion 102 and the pushing amount of the top surface 102a can be adjusted according to a desired part or a predetermined range over the entire circumference of the top surface 102a. Can be adjusted.

  As a result, even when the cylinder head and the gasket are actually attached to the cylinder block 100, even when the pushing force P and the pushing amount of the cylinder bore portion 102 are partially different depending on the circumferential portion of the annular top surface 102a, deformation control is performed. It is possible to prevent local deformation of the cylinder bore portion 102 by increasing / decreasing the notch width 35a and the notch depth 35b of the portion 35 and appropriately setting the number and forming positions of the deformation control portions 35, which is ideal. A modification of the cylinder bore 101 can be obtained. The formation of the deformation control portion 35 by cutting the flange 25 into a groove shape or a U shape can be formed at a low processing cost by relatively simple machining, and the same processing by machining is easy. Excellent reproducibility.

  Moreover, the example of the deformation | transformation control part of another form is shown in FIG. As shown in FIG. 10 (a), the deformation control unit 36 shows a cross-sectional view of the main part of the pushing sleeve 20, and FIG. 10 (b) shows a cross-sectional perspective view of the main part of the sleeve 20. The peripheral surface 26 and the top surface 30 are formed by notching and forming a partially L-shaped cross section from the inner peripheral surface 26 to the top surface 30 along a corner portion 29 where the peripheral surface 26 and the top surface 30 are continuous. By changing the thickness 25h of the flange portion 25 locally or partially by the deformation control portion 36 that is cut out in an L shape along the corner portion 29, the flange portion 25, the cylindrical portion 21, and the flange portion 25. The elastic deformation region and the amount of elastic deformation over the continuous portion of the cylindrical portion 21 can be partially adjusted, and the pushing force P against the top surface 102a of the cylinder bore portion 102 and the pushing amount of the top surface 102a are set to the entire circumference of the top surface 102a. Can be partially adjusted.

  As a result, even when the pushing force P and the pushing amount of the cylinder bore portion 102 are partially different in the circumferential portion of the top surface 102a in a state where the cylinder head and the gasket are actually attached to the cylinder block 100, the circumference of the deformation control portion 36 is increased. Local deformation of the cylinder bore 102 can be prevented by increasing / decreasing the direction length 36a, the notch width 36b, and the notch depth 36c, and appropriately setting the number and forming positions of the deformation control units 35. The pushing force P against the top surface 102a of the cylinder bore portion 102 and the pushing amount of the top surface 102a can be adjusted over the entire circumference of the top surface 102a in accordance with a desired portion or a predetermined range. The deformation control unit 36 formed by cutting the flange portion 25 into an L shape can be formed at a low machining cost by relatively simple machining, and the same machining by machining is easy and reproducible. Excellent.

  Further, another example of the deformation control unit is shown in FIG. 11A shows a sectional view of the principal part of the pushing sleeve 20, and FIG. 11B shows a sectional perspective view of the principal part of the sleeve 20. As shown in FIG. A circumferential surface 26 and a top surface 30 are continuously cut along the corner portion 29 in the circumferential direction from the inner peripheral surface 26 to the top surface 30, and the flange portion 25 has a thickness 25 h. Is partially different. By changing the thickness 25h of the flange portion 25 locally or partially by the deformation control portion 37 formed by cutting out into a tapered shape or a chamfered shape along the corner portion 29, the flange portion 25, the cylindrical portion 21, The elastic deformation region and the elastic deformation amount over the continuous portion of the flange portion 25 and the cylindrical portion 21 can be partially adjusted, and the pressing force P of the top surface 102a of the cylinder bore portion 102 and the pressing amount of the top surface 102a are adjusted to the circumference of the top surface 102a. It can be adjusted according to the location of the direction. The deformation of the cylinder bore 102 is locally deformed by increasing / decreasing the circumferential length 37a, the notch width 37b, and the notch depth 37c of the deformation controller 37, and appropriately setting the number and forming positions of the deformation controllers 37. Can be prevented, and an ideal deformation of the cylinder bore 101 can be obtained. The deformation control unit 37 formed by notching the flange portion 25 in an L shape can be formed by relatively simple machining and has excellent reproducibility.

  The deformation control unit for partially varying the thickness 25h of the flange portion 25 in the push-in sleeve 20 includes a deformation control unit 35 in which the top surface 30 of the flange portion 25 is cut out in a groove shape or a U shape, It is not limited to the deformation control unit 36 formed by cutting out in an L shape along the portion 29 and the deformation control unit 37 formed by cutting out into a tapered shape or a chamfered shape along the corner portion 29, but a circular arc shape in cross section It can be formed in an appropriate shape such as a notch, and can be formed with the deformation control portions 35, 36, 37, etc. as appropriate.

  Furthermore, the bore contact surface 24 of the cylindrical portion 21 that abuts the top surface 102a of the cylinder bore portion 102 is continuous in the circumferential direction with a convex cross section in which the top end 24a projects toward the top surface 102a of the cylinder bore portion 102, and the top end. The amount of elastic deformation in the radial direction of the cylinder bore portion 102 can be partially controlled by partially changing 24a. An example of the bore contact surface 24 will be described with reference to FIGS.

  For example, as shown in the cross section of the main part in FIG. 12A, the top end 24a is inclined so as to change from the inner peripheral surface 23 side to the outer peripheral surface 22 side as the bore contact surface 24 moves from the proximal end side to the distal end. Is displaced to the outer peripheral surface 22 side and is formed so as to be continuous in the circumferential direction, the top end 24a abuts on the top surface 102a of the cylinder bore portion 102 as shown in FIG. When the piston 102 is pushed in, a drag force F is generated in the cylinder portion 102, while a component force Pa in the direction of the outer peripheral surface 22 is generated in the top portion 24 a that is displaced from the outer peripheral surface 22. That is, elastic deformation is imparted in the diameter increasing direction protruding toward the water jacket 103 side.

  Further, as shown in the cross-section of the main part in FIG. 13A, the top end is inclined so as to change from the outer peripheral surface 22 side to the inner peripheral surface 23 side as the bore contact surface 24 moves from the proximal end side to the distal end side. In a portion where 24a is displaced toward the inner peripheral surface 23 side and continuously formed along the circumferential direction, the top end 24a abuts on the top surface 102a of the cylinder bore portion 102 as shown in FIG. When the portion 102 is pushed in, a drag force F is generated in the cylinder bore portion 102, whereas a component Pa in the direction of the inner peripheral surface 23 is generated in the top portion 24 a displaced from the inner peripheral surface 23, so that the cylinder bore portion 102 is moved to the cylinder bore 101. Elastic deformation is imparted inward in the radial direction, that is, in the reduced diameter direction protruding toward the cylinder bore 101 side.

  Further, in the portion where the top end 24a of the bore contact surface 24 is flat as shown in FIG. 14 (a), the top end 24a contacts the top surface 102a of the cylinder bore portion 102 as shown in FIG. 14 (b). When the top end 24a comes into contact with the top surface 102a of the cylinder bore portion 102 and the cylinder bore portion 102 is pushed in by the pushing force P, the central portion in the width direction of the top surface 102a of the cylinder bore portion 102 is pushed in, and the outer peripheral surface 22 and the inner peripheral surface Generation of component forces in the 23 directions is suppressed, and elastic deformation in the radially outward and inward directions of the cylinder bore 101 of the cylinder bore portion 102 is suppressed.

  That is, the position of the top end 24a of the bore contact surface 24 that abuts and presses against the top surface 102a of the cylinder bore portion 102 is locally or partially changed in the radial direction of the cylindrical portion 22 so that the radial direction of the cylinder bore portion 102 is increased. The elastic deformation region and the elastic deformation amount can be partially adjusted, the elastic deformation in the radial direction of the cylinder bore portion 102 can be adjusted according to the circumferential portion, and the ideal deformation of the cylinder bore portion 102 can be obtained. . The bore contact surface 24 can be formed by relatively simple machining, and the same machining by machining is easy and excellent in reproducibility.

  By making each pushing sleeve 20 detachable corresponding to each cylinder bore 101, the pushing sleeves 20 function without interfering with each other, and the deformation control portion and the bore contact surface 24 of each pushing sleeve 20. Adjustment is facilitated, and when the pushing sleeve 20 is worn, only the pushing sleeve 20 can be replaced, and a cost reduction can be achieved as compared with the case where the entire dummy head is replaced.

  Further, in addition to the above-described embodiment, the flanges 25, 25 are formed by the arrangement of the sleeve fixing bolts 34 and the knock pins 35 for fastening the flange portions 25 of the push-in sleeves 20 to the dummy head body 10 and the increase / decrease of the sleeve fixing bolts 34 and the knock pins 35. It is also possible to partially adjust the elastic deformation region and the elastic deformation amount over the continuous portion of the cylindrical portion 21, the flange 25 and the cylindrical portion 21.

DESCRIPTION OF SYMBOLS 1 Dummy head 10 Dummy head main body 11 Matching surface 12 Tightening surface 13 Bolt insertion hole 15 Through hole 18 Bolt member 19 Bos part 20 Bore pushing sleeve 21 Cylindrical part 22 Outer peripheral surface 23 Inner peripheral surface 24 Bore contact surface 24a Top part 25 Flange Portion 26 inner peripheral surface 27 outer peripheral surface 28 contact surface 29 corner portion 30 top surface 31 sleeve fixing bolt through hole 39 sleeve fixing bolts 35, 36, 37 deformation control unit 100 cylinder block 101 cylinder bore 102 cylinder bore portion 102a top surface 103 Water jacket 104 Cylinder outer wall 104a Top surface 105 Cylinder head mounting surface 106 Head bolt hole

Claims (7)

When processing the cylinder bore formed in the cylinder bore of the cylinder block, the cylinder block is deformed by pressing the top surface of the cylinder bore portion by assembling the cylinder block mounting surface of the cylinder block by bolting instead of the cylinder head. In processing dummy head,
A bolt member screwed into a head bolt hole for fastening the cylinder head of the cylinder block;
Corresponding to a bolt insertion hole and a cylinder bore for inserting the bolt member for bolt fastening to the cylinder head mounting surface in a plate shape having a mating surface facing the cylinder head mounting surface and a fastening surface opposite to the cylinder mounting surface. A dummy head body provided with a through-hole opening,
An annular flange portion fastened to the fastening surface of the dummy head body by a sleeve fixing bolt, and a base end is coupled to the flange portion and is fitted into the through hole, and the top surface of the cylinder bore portion is pressed to the tip. A bore pushing sleeve comprising a cylindrical portion having an annular bore contact surface;
A dummy head for machining a cylinder block, comprising a deformation control part for forming a part having a different thickness of the flange part in a part of the flange part of the bore pushing sleeve. The bore contact surface of the cylindrical portion is
2. The dummy head for machining a cylinder block according to claim 1, wherein the dummy block has a convex shape that protrudes toward the cylinder bore portion of the cylinder block and has a top end that continues along the circumferential direction of the cylindrical portion. The deformation control unit
3. The cylinder block processing dummy head according to claim 1, wherein the cylinder block machining dummy head is a groove-shaped or U-shaped notch formed in a top surface of the flange portion. 4. The deformation control unit
3. The cylinder block processing dummy head according to claim 1, wherein the connecting portion between the flange portion and the cylindrical portion is a chamfer along a corner portion of the connecting portion. The deformation control unit
3. The cylinder block according to claim 1, wherein the connecting portion between the flange portion and the cylindrical portion is a notch formed by cutting out the L-shaped section along the corner portion of the connecting portion. Dummy head for processing.   6. The cylinder block machining according to claim 1, wherein a bore contact surface of the cylindrical portion protrudes from a mating surface of the dummy head main body in a state in which the pushing sleeve is attached to the dummy head main body. Dummy head.   The dummy head body has a plurality of through holes corresponding to a plurality of cylinder bores, and the bore pushing sleeves are arranged independently for each through hole. 2. A cylinder block processing dummy head according to claim 1.

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