JP2013231207A - Sealing fixture of cylinder block plating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely seal one end of a cylinder inner circumferential surface even when a space reaching the one end side of the cylinder inner circumferential surface is narrow, and to prevent contact with the cylinder inner circumferential surface.SOLUTION: A sealing fixture 21 of a cylinder block plating apparatus 20 seals one end 4 of a cylinder inner circumferential surface by guiding a treatment liquid to the cylinder inner circumferential surface 3 of a cylinder 2 in a cylinder block 1 for subjecting the cylinder inner circumferential surface to plating pretreatment or plating treatment. The sealing fixture 21 includes: a folding plate part 30 wherein a main plate and a subplate are disposed foldably; a diameter expansion plate part 31 layered on the folding plate part and constructed to be expanded/shrunk in diameter when a plurality of diameter expansion plates disposed in the circumferential direction move relative to the folding plate part 30; and a seal member 33 attached to at least the outer circumference of the diameter expansion plate part, allowed to be butted with the cylinder inner circumferential surface, and composed of an elastic member.

Description

  The present invention relates to a sealing jig for a cylinder block plating apparatus for sealing one end of a cylinder inner peripheral surface in a cylinder of a cylinder block to circulate a processing liquid and pre-plating or plating the cylinder inner peripheral surface. .

  Conventionally, one end (crankcase surface side end) and the other end (cylinder head surface side end) of the cylinder inner peripheral surface of the cylinder of the cylinder block are sealed to circulate the processing liquid, and the cylinder inner peripheral surface There is known a cylinder block plating apparatus for performing plating.

  Among these, Patent Document 1 discloses a device in which a sealing jig having a diameter larger than that of the electrode is attached to the upper portion of the electrode, and one end portion of the inner peripheral surface of the cylinder is sealed by the sealing jig. Further, Patent Document 2 discloses a sealing jig provided with a sealing member that can be expanded by compressed air, which is installed on the upper portion of an electrode, and one end portion of a cylinder inner peripheral surface is sealed by the sealing jig. ing.

Japanese Patent Laid-Open No. 8-261555 JP 2010-59458 A

  However, since the sealing jigs described in Patent Documents 1 and 2 are installed on the upper part of the electrode, when the electrode is inserted into the inner peripheral surface of the cylinder, the sealing jig is attached to the inner peripheral surface of the cylinder. There is a risk of contact. In the unlikely event that the sealing jig comes into contact with the inner peripheral surface of the cylinder that has been subjected to, for example, electrolytic etching by the pre-plating treatment, and this electrolytic etching treatment portion is damaged, the adhesion of the plating layer by the subsequent plating treatment is reduced. There is a risk of damage.

  Moreover, since the sealing jig | tool of patent document 1 and 2 is installed in the upper part of an electrode, when replacing | exchanging an electrode etc. by a plating pretreatment process and a plating treatment process, a sealing jig is also simultaneous. Will be exchanged. As a result, the sealing position by the sealing jig may be different between the plating pretreatment process and the plating treatment process. For example, a plating layer is formed in a portion where the electrolytic etching treatment is not performed. May decrease.

  The object of the present invention has been made in consideration of the above-mentioned circumstances, and can securely seal one end of the cylinder inner peripheral surface even when the space to one end of the cylinder inner peripheral surface is narrow. Another object of the present invention is to provide a sealing jig for a cylinder block plating apparatus capable of avoiding contact with the cylinder inner peripheral surface.

  The present invention provides a cylinder block plating process for sealing one end of the cylinder inner peripheral surface in order to introduce a treatment liquid to the cylinder inner peripheral surface of the cylinder in the cylinder block and to perform pre-plating or plating treatment on the cylinder inner peripheral surface. In the sealing jig of the apparatus, a bending plate portion in which a main plate and a sub plate are foldably arranged, and a plurality of diameter-enlarged plates arranged in a circumferential direction and stacked on the bending plate portion are provided. By moving with respect to the bending plate part, the diameter-enlarging plate part configured to be able to be expanded or reduced in diameter, and mounted on at least the outer periphery of the diameter-enlarging plate part so as to be able to contact the inner peripheral surface of the cylinder And a sealing member made of an elastic material.

  According to the present invention, even when the space to the one end portion of the cylinder inner peripheral surface is narrow, the sealing jig passes through the narrow space by folding the sealing jig with the folding plate portion. It can guide to one end of the cylinder inner peripheral surface. At this position, the sealing jig is returned to the flat state by the bent plate portion, the diameter expanding plate portion is expanded, and the sealing member is brought into contact with one end portion of the inner peripheral surface of the cylinder, so that the one end portion is securely attached. Can be sealed. Further, since the sealing jig does not pass through the space surrounded by the cylinder inner circumferential surface, it is possible to avoid the sealing jig from contacting the cylinder inner circumferential surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a state in which one embodiment of a sealing jig of a cylinder block plating apparatus according to the present invention seals one end portion of a cylinder inner peripheral surface in each cylinder of a cylinder block. The sealing jig | tool of FIG. 1 is shown, (A) is a perspective view at the time of diameter reduction of an enlarged diameter plate part, (B) is a perspective view at the time of diameter expansion of an enlarged diameter plate part. The perspective view which shows the sealing jig | tool of FIG. 1 and shows the time of bending by a bending plate part. The perspective view which shows the condition which attaches or removes the sealing jig of FIG. 1 to a cylinder block. The top view which shows the sealing jig | tool of FIG. Sectional drawing which follows the VI-VI line of FIG. Sectional drawing which follows the VII-VII line of FIG. It is sectional drawing which follows the VIII-VIII line of FIG. 5, (A) is sectional drawing at the time of diameter expansion of a diameter-expanding plate part, (B) is sectional drawing at the time of diameter reduction of a diameter-expanding plate part. The bending plate part of the sealing jig | tool of FIG. 5 is shown, (A) is a top view, (B) is the IX arrow line view of FIG. 9 (A). The diameter expansion plate part of the diameter expansion plate part in the sealing jig | tool of FIG. 5 is shown, (A) is a top view, (B) is a X arrow directional view of FIG. 10 (A). The diameter expansion plate part in the sealing jig | tool of FIG. 5 is shown, (A) is a top view at the time of diameter reduction, (B) is a XI arrow line view of FIG. 11 (A). The diameter expansion plate part in the sealing jig | tool of FIG. 5 is shown, (A) is a top view at the time of diameter expansion, (B) is a XII arrow line view of FIG. 12 (A). The sealing member in the sealing jig of FIG. 5 is shown, (A) is a top view, (B) is sectional drawing which follows the XIIIB-XIIIB line | wire of FIG. 13 (A), (C) is XIIIC- of FIG. 13 (A). Sectional drawing which follows a XIIIC line. Sectional drawing corresponding to FIG. 8 (A) which shows the state which attached the guide member to the sealing jig | tool of FIG.1 and FIG.5. The perspective view which shows the guide member of FIG. (A) is sectional drawing which follows the XVI-XVI line of FIG. 14, (B) is a schematic sectional drawing explaining the effect | action of the wedge part in the guide member of FIG. 16 (A).

Embodiments for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view showing a state in which one embodiment of a sealing jig of a cylinder block plating apparatus according to the present invention seals one end portion of a cylinder inner peripheral surface in each cylinder of a cylinder block. 2A and 2B show the sealing jig of FIG. 1, where FIG. 2A is a perspective view when the diameter-expanding plate portion is contracted, and FIG. 2B is a perspective view when the diameter-expanding plate portion is expanded. FIG. 3 is a perspective view showing the sealing jig of FIG. 1 and being bent by the bending plate portion.

  As shown in FIG. 1, a plating apparatus 20 for a cylinder block 1 in an engine includes one end portion (that is, an end portion on the crankcase surface 6 side) 4 of a cylinder inner peripheral surface 3 in each cylinder 2 of the multi-cylinder cylinder block 1. The other end portion (that is, the end portion on the cylinder head surface 7 side) 5 is sealed with, for example, a plate-shaped seal sheet 22, and a processing solution (plating pretreatment solution, The plating inner solution 3 is guided, and the cylinder inner peripheral surface 3 is subjected to pre-plating treatment or plating treatment at high speed by the action of the electrode 23 arranged opposite to the cylinder inner peripheral surface 3. As a result, a plating layer (not shown) is formed on the cylinder inner peripheral surface 3 and the wear resistance of the cylinder inner peripheral surface 3 is improved.

  That is, in the plating pretreatment process, the plating pretreatment liquid in the chemical solution tank 24 is moved from the lower side to the upper side of FIG. 1 by the liquid feed pump 25 through the gap flow path 26 between the electrode 23 and the cylinder inner peripheral surface 3. As shown by the arrow A, it flows downward through the in-electrode flow path 27 of the cylindrical electrode 23 to the chemical liquid tank 24 and circulates in this path. During this time, a voltage is applied by the power supply 28 so that the cylinder block 1 becomes a positive electrode and the electrode 23 becomes a negative electrode, and the cylinder inner peripheral surface 3 of each cylinder 2 is subjected to pre-plating treatment (for example, electrolytic etching treatment, anodization). Processing).

  In the plating process, the plating solution in the chemical tank 24 flows from the lower part of the electrode 23 to the upper part in FIG. Flows into the gap channel 26 between the cylinder and the inner peripheral surface 3, flows from the upper side to the lower side in the gap channel 26, reaches the chemical tank 24, and circulates in this path. During this time, a voltage is applied by the power source 28 so that the electrode 23 becomes a positive electrode and the cylinder block 1 becomes a negative electrode, and the cylinder inner peripheral surface 3 of each cylinder 2 is plated to form a plating layer. .

  Meanwhile, on the crankcase surface 6 side of the cylinder block 1, a plurality of crank journals 10 having a crank bearing surface 9 are integrally formed between the crankcase surface 6 and one end 4 of the cylinder inner peripheral surface 3. Yes. These crank journals 10 are formed so as to protrude to the inside of each cylinder 2 (on the central axis O side of the cylinder 2), and the distance L of the space 11 between the crank journals 10 is set to be smaller than the diameter S of the cylinder 2. Has been.

  Now, the sealing jig 21 seals one end portion 4 of the cylinder inner peripheral surface 3 in each cylinder 2 of the cylinder block 1, and as shown in FIGS. It has a diameter plate portion 31, a drive member 32, and a seal member 33, and is configured separately from the electrode 23.

  The sealing jig 21 is configured in a two-layer structure in which a folding plate portion 30 divided into two parts is arranged on an enlarged plate part 31 divided into four parts, and has a diameter expansion function and a bending function. The diameter expansion function is a function that the diameter expansion plate portion 31 performs, and as shown in FIGS. 2A and 2B, the sealing jig 21 is expanded or contracted in the radial direction. By enlarging the sealing jig 21, it is possible to seal the one end portion 4 of the cylinder inner peripheral surface 3 in the cylinder 2.

  Further, the bending function is mainly performed by the bending plate portion 30, and as shown in FIG. 3, the sealing jig 21 is bent in an L shape in a side view. As a result, as shown in FIGS. 1 and 4, the space (that is, the space 11 between the crank journals 10) extending from the outside of the cylinder inner peripheral surface 3 toward the one end 4 side of the cylinder inner peripheral surface 3 of the cylinder 2 is narrow. Even in this case, the bent sealing jig 21 can be guided to the one end 4 of the cylinder inner peripheral surface 3 through the space 11.

  As shown in FIG. 5 to FIG. 7 and FIG. 9 (particularly FIG. 5 and FIG. 9), the bending plate portion 30 includes a main plate 34 having a bulging portion 34A and a concave portion 35A that engages with the bulging portion 34A. And a sub plate 35 provided with a bendable separation. In the main plate 34, a female screw 36 is formed at a portion including the bulging portion 34A. In addition, guide grooves 37 are radially formed in the main plate 34 and the sub plate 35 around the female screw 36. Furthermore, pin fitting holes 38 are formed on both sides of the bulging portion 34A and the recess 35A at the joint surface of the main plate 34 and the sub plate 35.

  Further, pin insertion holes 39 are formed on both side surfaces of the main plate 34 and the sub plate 35 with the joint surface between the main plate 34 and the sub plate 35 interposed therebetween. The pins 41 of the posture adjusting jig 40 are inserted into these pin insertion holes 39. As a result, the bending plate portion 30 is maintained in a flat state from a bendable state, and the main plate 34 and the sub plate 35 are integrated.

  As shown in FIGS. 7 and 8, the male screw 42 of the driving member 32 is screwed into the female screw 36 of the main plate 34, and the driving member 32 is provided so as to be movable in the axial direction. A tapered and substantially conical drive side taper 43 is formed on the tip end side of the drive member 32 in the axial direction. A fixing bolt 44 having a tool fitting hole 45 is fastened and fixed to the proximal end side in the axial direction of the drive member 32. Further, an abutting flange 46 protrudes radially outward at a substantially central position in the axial direction of the drive member 32.

  A dedicated tool 65 (see FIG. 14) such as a hexagon wrench is fitted into the tool fitting hole 45 of the fixing bolt 44 and the drive member 32 is rotated, whereby the male screw 42 and the female screw 36 of the main plate 34 are As a result, the drive member 32 moves in the axial direction, and the contact flange 46 contacts the top surface of the main plate 34 of the bent plate portion 30, so that the movement toward the tip side is restricted.

  As shown in FIGS. 11 and 12, a plurality of (in the present embodiment, four in the present embodiment) circumferentially extending plate 47 shown in FIG. It is configured. Each diameter expansion plate 47 has a bolt coupling hole 48 formed at a substantially central position in the radial direction. 5 and 6 are inserted into the guide groove 37 of the bending plate portion 30 and screwed into the bolt connection holes 48 of the respective enlarged diameter plates 47, so that each enlarged diameter plate 47 is fixed. It couple | bonds with the bending plate part 30. FIG. Further, when the coupling bolt 49 is inserted through the guide groove 37 of the bending plate portion 30, each diameter-expanding plate 47 moves along the guide groove 37 with respect to the bending plate portion 30. The part 31 is configured to be able to expand or contract. The diameter-reduced state of the diameter-enlarged plate portion 31 is shown in FIGS. 2A and 11, and the diameter-enlarged state is shown in FIGS.

  As shown in FIG. 10, a driven side taper 50 is formed on each radially enlarged plate 47 of the radially enlarged plate portion 31 at a radially inner side (center side) position. The driven-side taper 50 is formed in a curved surface that tapers toward the bottom surface of the enlarged-diameter plate 47, and the driven-side taper 50 of the four enlarged-diameter plates 47 in the enlarged-diameter plate portion 31 is continuous, so that FIG. As shown in FIG. 11B and FIG.

  When the drive member 32 is rotated as described above and the drive member 32 moves to the front end side in the axial direction by the action of the male screw 42 of the drive member 32 and the female screw 36 of the main plate 34 of the bending plate portion 30, FIG. As shown in (A), the drive side taper 43 of the drive member 32 presses the driven side taper 50 of the diameter-enlarged plate 47. As a result, as shown in FIGS. 2B and 5, the diameter-enlarging plate 47 moves radially outward when the coupling bolt 49 moves along the guide groove 37 of the bent plate portion 30. The diameter-expanding plate portion 31 is expanded in diameter. The diameter expansion amount Δr (FIG. 8) of the radius of the diameter expansion plate portion 31 becomes substantially constant as the movement of the drive member 32 toward the distal end side is restricted by the contact flange 46.

  Further, as shown in FIG. 10, each enlarged diameter plate 47 of the enlarged diameter plate portion 31 is provided with a superposed piece 51 protruding at one end on the outer peripheral side and a hollow portion 52 formed at the other end on the opposite side. When the enlarged plate 47 is adjacent to each other to form the enlarged plate portion 31 (see FIGS. 11 and 12), the superposed piece 51 of the enlarged plate 47 is when the diameter of the enlarged plate portion 31 is reduced (FIG. 11). Even when the diameter is increased (FIG. 12), it is configured to overlap the recess 52 of the adjacent enlarged diameter plate 47. Thereby, the outer periphery of the enlarged diameter plate part 31 maintains the continuous circular shape also when the clearance gap 53 arises between the enlarged diameter plates 47 adjacent at the time of diameter expansion.

  As shown in FIG. 13, the sealing member 33 includes a disc-shaped bottom plate portion 54, a standing portion 55 that stands from the outer periphery of the bottom plate portion 54, and an annular shape that continues to the upper edge of the standing portion 55. The annular portion 56 is integrally formed and is made of a rubber material as an elastic member.

  This rubber material is a general rubber material such as natural rubber or nitrile butadiene rubber, in addition to a special rubber material such as silicon rubber, urethane rubber, or acrylic rubber.

  As shown in FIGS. 5, 7, and 8, the sealing member 33 configured in this way is attached in close contact with the outer periphery and the bottom surface of the diameter expansion plate portion 31. Even when the diameter expansion plate portion 31 is expanded in diameter as shown in FIG. 12, the outer periphery is held in a circular shape due to the presence of the polymerized piece 51, and at this time, the entire outer periphery of the diameter-expanded plate portion 31 including the polymerized piece 51 is the sealing member. The seal member 33 is expanded in diameter by contacting and pressing the 33 standing portion 55.

Further, the plate thickness of the sheet member 33, particularly the plate thickness t (FIG. 13) of the standing portion 55, since the diameter expansion amount of the radius of the diameter expansion plate portion 31 is Δr (FIG. 8).
Δr ≦ t ≦ 3Δr
Is set in the range. The reason why the thickness t of the standing portion 55 of the seal member 33 is set to be equal to or larger than the diameter expansion amount Δr of the radius of the diameter-enlarged plate portion 31 is that the seal member 33 can be This is to ensure elasticity for sealing the inner peripheral surface 3. In addition, the thickness t of the standing portion 55 of the seal member 33 is set to be not more than three times the diameter expansion amount Δr of the radius of the diameter-expanding plate portion 31 so that the standing portion 55 of the seal member 33 is not thickened more than necessary. Because. Specifically, the plate thickness t of the standing portion 55 of the seal member 33 is specifically about 2 to 8 mm.

  Further, as shown in FIG. 13, the seal member 33 is provided with a pair of positioning ribs 57 at positions facing each other in a plan view. The positioning rib 57 is integrally protruded outward from the upper end edge of the standing portion 55. The discharge amount H of the positioning rib 57 is set to about 2 to 10 mm. The positioning rib 57 is locked to the positioning surface 12 of the cylinder block 1 as shown in FIG. 13B when positioning the sealing jig 21 to the one end 4 of the cylinder inner peripheral surface 3 of the cylinder 2 in FIG. Thus, the sealing jig 21 is positioned on the cylinder block 1.

  Further, as shown in FIGS. 3, 5, and 13, the annular portion 56 of the seal member 33 has a pair of relief portions 58 facing each other on the side where the diameter expansion plate portion 31 is bent by the bending plate portion 30. Is formed. The relief portion 58 is formed by being cut out in a range from the inner edge of the annular portion 56 to the substantially standing portion 55. The escape portion 58 avoids the overlapped piece 51 in the diameter expansion plate 47 of the diameter expansion plate portion 31 from coming into contact with the annular portion 56 of the seal member 33 when the bending plate portion 30 and the diameter expansion plate portion 31 are bent. The overlapping piece 51 protrudes from the escape portion 58, so that the bending plate portion 30 and the enlarged diameter plate portion 31 can be bent. In the present embodiment, the relief portion 58 is formed in the vicinity of the positioning rib 57 to ensure the strength of the seal member 33.

  The guide member 60 shown in FIGS. 14 and 15 is used when a tool 65 (for example, a hexagon wrench) is fitted into the tool fitting hole 45 of the fixing bolt 44 in the driving member 32 of the sealing jig 21. This is for assisting the fitting, and is detachably attached to the sealing jig 21. The guide member 60 includes a central pipe portion 61, guide pins 62, and a wedge portion 63. The central pipe portion 61 is erected from the central position on the upper surface of the substrate 64. Further, two guide pins 62 project downward from the lower surface of the substrate 64.

  The central pipe portion 61 is provided in a size that allows the tool 65 to be inserted therethrough. Further, the guide pin 62 is fitted into the pin fitting hole 38 in the bending plate portion 30 of the sealing jig 21, whereby the guide member 60 is detachably attached to the sealing jig 21. In the mounted state of the guide member 60, the central pipe portion 61 of the guide member 60 is set to be coaxial with the drive member 32 of the sealing jig 21. That is, the center Q of the central pipe portion 61 coincides with the center P of the tool fitting hole 45 of the fixing bolt 44 in the drive member 32. Thereby, the tool 65 inserted into the central pipe portion 61 is easily guided to the tool fitting hole 45 of the fixing bolt 44. In this way, by operating the tool 65 guided and fitted in the tool fitting hole 45, the drive member 32 rotates and the diameter-expanding plate portion 31 is expanded or contracted.

  Two wedge portions 63 are provided so as to protrude downward from the lower surface of the substrate 64 at both ends of the substrate 64. When the guide member 60 is mounted on the sealing jig 21 with the diameter-expanded plate portion 31 in the diameter-expanded state as described above, the wedge portion 63 is located between the adjacent diameter-expanded plates 47 as shown in FIG. A front end surface 66 having a V-shaped cross section is inserted into and engaged with the gap 53. When the tool 65 is operated in this state and the drive member 32 rotates to reduce the diameter of the diameter-enlarged plate portion 31, the gap 53 between the diameter-enlarged plates 47 is gradually narrowed. In the diameter-reducing process of the diameter-expanding plate portion 31, the adjacent diameter-expanding plate 47 rotates in the direction of the arrow α along the shape of the distal end surface 66 with the portion in contact with the distal end surface 66 of the wedge portion 63 as a fulcrum. Then, the diameter-enlarged plate portion 31 is bent to promote bending of the bent plate portion 30.

Next, a procedure for attaching or removing the sealing jig 21 configured as described above to the cylinder block 1 will be described.
As shown in FIG. 1, the sealing jig 21 is attached to one end portion 4 of the cylinder inner peripheral surface 3 in each cylinder 2 of the cylinder block 1 through the space 11 between the crank journals 10 in the cylinder block 1. At this time, since the diameter of the diameter-enlarged plate portion 31 when the sealing jig 21 is reduced is smaller than the diameter S of the cylinder inner peripheral surface 3, it is larger than the distance L between the crank journals 10 and is shown in FIG. In this way, it is bent by the bending plate part 30. In this bent state, as shown in FIG. 4, the sealing jig 21 passes through the space 11 between the crank journals 10.

  When the sealing jig 21 reaches the position of the positioning surface 12 of the cylinder block 1, as shown in FIG. 2A, the folding plate portion 30 is returned from the bent state to the flat state, and the sealing jig 21 is flattened. To do. In this state, the pin 41 of the posture adjusting jig 40 is inserted into the pin insertion hole 39 (FIG. 3) of the bending plate part 30, and the sealing jig 21 is held flat by the bending plate part 30. The main plate 34 and the sub plate 35 of the bending plate part 30 are integrated. Then, the positioning rib 57 of the sealing member 33 of the sealing jig 21 is engaged with the positioning surface 12 of the cylinder block 1 to position the sealing jig 21 on the cylinder block 1.

  After the sealing jig 21 is positioned, the guide pin 62 of the guide member 60 shown in FIG. 14 is fitted into the pin fitting hole 38 in the bending plate portion 30 of the sealing jig 21, so that the guide member 60 is sealed. Attach to 21. Then, a tool 65 is inserted into the central pipe portion 61 of the guide member 60, and the tool 65 is fitted into the tool fitting hole 45 of the fixing bolt 44 in the drive member 32 of the sealing jig 21, so that the sealing jig The drive member 32 is rotated while preventing the rotation of the 21. By this rotation, the drive member 32 moves to the tip side, the diameter-expanding plate portion 31 of the sealing jig 21 increases in diameter, and the elasticity of the sealing member 33 causes the sealing jig 21 to end at one end of the cylinder inner peripheral surface 3 of the cylinder 2. The part 4 is sealed.

  Although the sealing jig 21 is attached as described above, the guide member 60 is also used when the sealing jig 21 is removed. At this time, since the diameter-enlarged plate portion 31 is in the diameter-enlarged state, the sealing jig 21 is fitted with the guide pin 62 of the guide member 60 in the pin fitting hole 38 of the bent plate portion 30 of the sealing jig 21. At this time, the front end surface 66 of the wedge portion 63 of the guide member 60 engages with the gap 53 between the adjacent diameter-enlarged plates 47 in the diameter-enlarged plate portion 31.

  In this state, the tool 65 is inserted into the central pipe portion 61 of the guide member 60, and the tool 65 is fitted into the tool fitting hole 45 of the fixing bolt 44 in the drive member 32 of the sealing jig 21 to drive the drive member 32. Is rotated to reduce the diameter of the diameter-enlarging plate portion 31 of the sealing jig 21. In the diameter reducing process of the diameter increasing plate portion 31, the gap 53 between the diameter increasing plates 47 of the diameter increasing plate portion 31 is gradually reduced, and the diameter increasing plate 47 is rotated by the action of the distal end surface 66 of the wedge portion 63. Thus, the bending plate portion 30 and the enlarged diameter plate portion 31 are bent.

  Thereafter, the guide member 60 is removed from the seal jig 21, and the bent seal jig 21 is taken out through the space 11 between the crank journals 10 in the cylinder block 1.

Since it was configured as described above, according to the present embodiment, the following effects (1) to (7) are achieved.
(1) As shown in FIG. 1 to FIG. For this reason, even when the space 11 reaching the one end 4 side of the cylinder inner peripheral surface 3 of each cylinder 2 in the cylinder block 1 is narrow, the sealing jig 21 is bent by the bending plate portion 30, thereby The tool 21 can be guided to the one end 4 of the cylinder inner peripheral surface 3 through the narrow space 11. And by returning the sealing jig 21 to the flat state by the bent plate portion 30 at this position, expanding the diameter expanding plate portion 31 and bringing the sealing member 33 into contact with the one end portion 4 of the cylinder inner peripheral surface 3, The one end 4 can be reliably sealed by the elasticity of the seal member 33.

  (2) The sealing jig 21 is not attached to the electrode 23 of the plating apparatus 20 and is configured separately from the electrode 23. For this reason, only the sealing jig 21 can be attached independently to the one end portion 4 of the cylinder inner peripheral surface 3 of each cylinder 2 of the cylinder block 1 separately from the electrode 23. As a result, there is no need to pass the space (cylinder 2) sandwiched between the cylinder inner peripheral surface 3 through the seal jig 21, so that the seal jig 21 can be prevented from contacting the cylinder inner peripheral surface 3. In particular, the sealing jig 21 comes into contact with the electrolytic etching processing portion applied to the inner circumferential surface 3 of the cylinder in the pre-plating processing step and damages this electrolytic etching processing portion, and the adhesion of the plating layer by the subsequent plating processing is reduced. Can avoid the situation.

  (3) Since the sealing jig 21 can be mounted on the cylinder inner peripheral surface 3 of the cylinder 2 of the cylinder block 1 separately from the electrode 23, the electrode 23 and the like are replaced, and the plating pretreatment and the plating treatment are performed. When it does, it can hold | maintain in the attachment state, without removing the sealing jig 21 from a plating pretreatment process to a plating treatment process. As a result, it is possible to reliably prevent the occurrence of a situation in which a plating layer is formed at a location where the electrolytic etching treatment portion is not formed by the pre-plating treatment.

  (4) On the outer peripheral side of each enlarged-diameter plate 47 of the enlarged-diameter plate portion 31 in the sealing jig 21, when the diameter-enlarged plate portion 31 is expanded and contracted, the recessed portion 52 of the adjacent enlarged-diameter plate 47 is provided. A superposed piece 51 is formed. Thereby, even if the clearance gap 53 arises between the diameter expansion plates 47 adjacent at the time of diameter expansion, the diameter expansion plate part 31 can hold | maintain an outer periphery in circular shape. For this reason, the seal members 33 mounted on the outer periphery and bottom surface of the diameter-enlarged plate portion 31 come into contact with the entire outer periphery of the diameter-enlarged plate portion 31 including the overlapped piece 51 and are uniformly pressed and expanded in diameter, so that the cylinder block 1 The cylinder 2 abuts against one end 4 of the cylinder inner peripheral surface 3. As a result, the surface pressure acting on the one end portion 4 of the cylinder inner peripheral surface 3 by the seal member 33 becomes uniform, so that the one end portion 4 of the cylinder inner peripheral surface 3 can be reliably sealed by the sealing jig 21.

  (5) The sealing member 33 of the sealing jig 21 is pressed and expanded in diameter by the diameter expansion of the diameter expansion plate portion 31, thereby contacting the cylinder inner peripheral surface 3 of the cylinder 2, and The one end 4 is sealed. For this reason, the sealing member 33 does not lose its sealing function even if it is slightly damaged or deteriorated, as compared with the case where the sealing member is inflated with, for example, compressed air to contact the inner circumferential surface 3 of the cylinder.

  (6) In the drive member 32 that moves to the distal end side in the axial direction in order to increase the diameter of the diameter-enlarged plate portion 31 of the sealing jig 21, the contact flange 46 of the drive member 32 is on the top surface of the bent plate portion 30. The contact is regulated by the contact. For this reason, the amount of movement of the drive member 32 toward the tip end in the axial direction can be made uniform every time, and therefore the diameter expansion amount Δr of the radius of the diameter expansion plate portion 31 can be made constant every time. As a result, the seal member 33 abuts on the cylinder inner peripheral surface 3 with a constant pressing force every time and can seal the one end 4 of the cylinder inner peripheral surface 3, thereby realizing a stable seal.

  (7) The seal member 33 of the seal jig 21 is provided with a pair of positioning ribs 57 that are engaged with the positioning surface 12 of the cylinder block 1 to position the seal jig 21. As a result, the sealing position accuracy in the height direction of the cylinder inner peripheral surface 3 by the sealing jig 21 can be improved.

  Although the embodiment has been described above, the present invention is not limited to the specific configuration of the embodiment as described above, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder 3 Cylinder inner peripheral surface 4 One end part 9 Crank bearing surface 10 Crank journal 11 Space 20 Plating processing device 21 Sealing jig 30 Bending plate part 31 Expanding plate part 32 Drive member 33 Seal member 34 Main plate 35 Sub-plate 43 Drive-side taper 47 Expanded-diameter plate 49 Coupling bolt 50 Driven-side taper 51 Superposition piece 53 Gap 57 Positioning rib 58 Relief part 60 Guide member 63 Wedge part

Claims (6)

In order to introduce the treatment liquid into the cylinder inner peripheral surface of the cylinder in the cylinder block and to perform the plating pretreatment or plating treatment on the cylinder inner peripheral surface, the sealing treatment of the cylinder block plating apparatus for sealing one end of the cylinder inner peripheral surface is performed. In the ingredients
A folding plate portion in which the main plate and the sub plate are arranged to be bendable;
A diameter-enlarged plate that is provided on the folding plate portion so as to be enlarged or reduced in diameter by moving a plurality of diameter-enlarged plates arranged in the circumferential direction with respect to the bending plate portion. And
A cylinder block plating apparatus comprising: a seal member mounted on at least an outer periphery of the diameter-enlarged plate portion and provided so as to be in contact with the inner peripheral surface of the cylinder and made of an elastic material. Seal jig. A drive-side taper is formed on the center side of each diameter-enlargement plate of the diameter-enlargement plate portion, and a drive member having a drive-side taper formed at the tip of the main plate of the bending plate portion is movable in the axial direction. 2. The structure according to claim 1, wherein the diameter-expanding plate portion is expanded by moving the drive member in an axial direction and pressing the driven-side taper by the drive-side taper. The sealing jig of the cylinder block plating apparatus as described in 2. On the outer peripheral side of each enlarged plate of the enlarged plate portion, a superposed piece that overlaps with the outer peripheral portion of the enlarged plate adjacent to the enlarged plate portion in the expanded and reduced diameter state and that also contacts the seal member The sealing jig of the cylinder block plating apparatus according to claim 1, wherein a sealing jig is provided. The guide member for inserting and guiding a tool for moving the driving member in the axial direction is detachably mounted on the bending plate portion in a coaxial state with the driving member. Or the sealing jig of the cylinder block plating processing apparatus of 3. The guide member includes a wedge portion that engages with a gap generated between adjacent enlarged diameter plates in the expanded state of the enlarged diameter plate portion, and the wedge portion is adjacent in the process of reducing the diameter of the enlarged diameter plate portion. The sealing jig of the cylinder block plating apparatus according to claim 4, wherein the bending plate portion is bent by rotating the diameter expansion plate. One end portion of the cylinder inner peripheral surface of the cylinder is an end portion on a crankcase surface side in a cylinder block provided with a crank journal provided with a crank bearing surface extending inwardly of the cylinder. Item 6. A sealing jig of a cylinder block plating apparatus according to any one of Items 1 to 5.

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