JP2005271139A - Outer peripheral curve working device for piston ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outer peripheral curve working device for a piston ring, preventing damage and deformation of a piston ring mounted between an inclined bearing surface and an inclined pressing surface in a lapping sleeve, simply mounting the piston ring in the lapping sleeve, and not limiting the number of piston rings mounted to a predetermined number. <P>SOLUTION: This outer peripheral curve working device 1 for the piston ring 2 includes: a bearing plate 22 and a pressing plate 32. The opposite surface of the bearing plate opposite to the pressing plate is provided with the inclined bearing surface and a first flat surface, and the opposite surface of the pressing plate opposite to the bearing plate is provided with the inclined pressing surface and a second flat surface. The first flat surface and the second flat surface are positioned on the opposite sides in the direction of diameter of the lapping sleeve 10. The inclined bearing surface and the inclined pressing surface are inclined parallel to the direction of diameter of the lapping sleeve to support two or more piston rings between them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an outer peripheral curved surface processing apparatus for a piston ring, and more particularly to an outer peripheral curved surface processing apparatus for a piston ring for processing the outer periphery of a piston ring into a barrel shape.

  Conventionally, the outer periphery of the piston ring has been curved into a barrel shape. A piston ring with a barrel shape on the outer periphery is such that the outer diameter takes the maximum value at the center position in the axial direction of the piston ring and the outer diameter takes the minimum value at both end positions in the axial direction. A piston ring with a curved surface.

  Patent Document 1 describes an outer peripheral curved surface processing apparatus for a piston ring for processing a peripheral surface of a piston ring into a barrel shape. As shown in FIG. 6, the outer peripheral curved surface processing apparatus 101 includes a wrapping sleeve 110, a shaft member 125, a receiving plate 120, and a presser plate 130, and the shaft member 125 is a cylindrical wrapping sleeve. 110 extends in the axial direction. The receiving plate 120 has a disk shape, is coaxially fixed to the shaft member 125, and is disposed in the wrapping sleeve 110 together with the shaft member 125. The receiving plate 120 includes an inclined receiving surface 122 that is inclined with respect to the diameter direction of the wrapping sleeve 110.

  The presser plate 130 has a disk shape and is provided on the shaft member 125 so as to be detachable coaxially within the wrapping sleeve 110 by a tightening nut 135, and faces the inclined receiving surface 122, and is an inclined pressing surface parallel to the inclined receiving surface 122. 132. A plurality of piston rings 102 are mounted in the wrapping sleeve 110 with their axial end surfaces overlapping in the axial direction, and are inclined between the inclined receiving surface 122 of the receiving plate 120 and the inclined pressing surface 132 of the holding plate 130. And is pinched. Here, since the piston ring 102 is mounted in the wrapping sleeve 110 in a state where the diameter of the piston ring 102 is reduced in the closing direction, a part of the outer peripheral surface of the piston ring 102 is wrapped by the self-expanding force of the piston ring 102. The sleeve 110 is always in contact with the inner circumferential surface of the cylinder.

In this state, when the wrapping sleeve 110 and the shaft member 125 are rotated relative to each other around the axis of the wrapping sleeve 110, for example, when the shaft member 125 is rotated around the axis about the wrapping sleeve 110, The piston ring 102 that is tilted and sandwiched between the inclined receiving surface 122 and the inclined pressing surface 132 rotates as if it is a precession in a gyroscope, and the cylindrical inner peripheral surface of the wrapping sleeve 110 The outer periphery of the piston ring 102 is processed into a barrel shape together with the self-expanding force of the piston ring 102.
Japanese Examined Patent Publication No. 43-6399 (1 to 2 pages, FIGS. 1 to 5)

  However, in the conventional outer peripheral curved surface processing apparatus 101 for piston rings, a plurality of piston rings 102 are sandwiched between the inclined receiving surface 122 and the inclined pressing surface 132, and the most in the axial direction is the pressing plate 130. The outer edge E1 of the inclined receiving surface 122 of the receiving plate 120 at a close position and the outer edge E2 of the inclined pressing surface 132 of the holding plate 130 closest to the receiving plate 120 in the axial direction form an acute angle portion. When the ring 102 is inserted and set in the wrapping sleeve 110 and when the piston ring 102 is taken out from the wrapping sleeve 110 after the outer periphery is processed, the acute angle portions E1 and E2 hit the piston ring 102, and the piston ring 102 is damaged. There was a problem of attaching or deforming.

  Moreover, in the conventional outer peripheral curved surface processing apparatus 101 of the piston ring, in order to mount a plurality of piston rings between the inclined receiving surface 122 and the inclined pressing surface 132 in the wrapping sleeve 110, the one end nut 135 is attached to the shaft member 125. The pressing plate 130 is removed by removing the pressing plate 130 and a predetermined number of piston rings are placed on the receiving plate 120, and then the holding plate 130 is placed on the piston ring and the nut 135 is screwed onto the shaft member 125. Cost. In addition, in the state where the presser plate 130 is attached to the shaft member 125 by the nut 135, the distance between the inclined receiving surface 122 and the inclined presser surface 132 is always constant, so that the number of piston rings for processing the outer peripheral surface is always constant. It is necessary to be. Therefore, it has not been possible to meet the demand for processing the outer peripheral curved surface only on the desired number of piston rings.

  Therefore, the present invention can prevent the piston ring mounted between the inclined receiving surface and the inclined pressing surface in the wrapping sleeve from being damaged or deformed, and can easily mount the piston ring in the wrapping sleeve. An object of the present invention is to provide a piston ring outer peripheral curved surface processing apparatus in which the number of piston rings to be mounted is not limited to a predetermined number.

  In order to achieve the above object, the present invention provides a wrapping sleeve having a cylindrical inner peripheral surface with which the outer peripheral surface of the piston ring contacts in a state where the diameter of the piston ring is reduced in a closing direction, and the wrapping sleeve A receiving portion supporting one axial end surface of the at least one piston ring, and a holding portion supporting the other axial end surface of the at least one piston ring. The receiving portion and the pressing portion include an inclined receiving surface and an inclined pressing surface that are inclined with respect to the diameter direction of the wrapping sleeve and face each other in parallel. The piston ring is held in an inclined manner in the wrapping sleeve, and the wrapping sleeve and the receiving part and the presser part are centered on the axis of the wrapping sleeve. In a piston ring outer peripheral curved surface processing apparatus that barrels the outer periphery of the piston ring in combination with the self-tensioning property of the piston ring by relative rotation, the surface of the receiving portion facing the presser portion is inclined A first flat surface orthogonal to the shaft center is formed following the receiving surface, and a second flat surface orthogonal to the shaft center is formed following the inclined surface pressing surface on the surface of the pressing portion facing the receiving portion. The first flat surface and the second flat surface are located on opposite sides of the wrapping sleeve in the diametrical direction, the boundary line between the inclined receiving surface and the first flat surface, the inclined pressing surface, and the first flat surface. The boundary line with 2 flat surfaces provides the peripheral curved surface processing apparatus of the piston ring which makes a ridgeline.

  Here, the receiving part and the pressing part have a circular cross section, and the first flat surface of the receiving part and the second flat surface of the pressing part each have an arc shape, and the radial direction of the receiving part The maximum values of the lengths of the first flat surface and the second flat surface in the radial direction of the presser portion are not less than 1/15 and not more than 1/2 of the diameter of the presser portion and the diameter of the receiving portion, respectively. Preferably there is.

  Moreover, it is preferable that the pressing portion is configured to be movable in the axial direction of the wrapping sleeve. Furthermore, it is preferable that the receiving portion is also configured to be movable in the axial direction of the wrapping sleeve.

  According to the piston ring outer peripheral curved surface processing apparatus according to claim 1, the first flat surface perpendicular to the axis of the wrapping sleeve is formed following the inclined receiving surface on the surface facing the pressing portion of the receiving portion. A second flat surface perpendicular to the axial center is formed following the inclined surface pressing surface on the surface facing the receiving portion of the portion, and the first flat surface and the second flat surface are opposite to each other in the diameter direction of the wrapping sleeve. Since the boundary line between the inclined receiving surface and the first flat surface and the boundary line between the inclined pressing surface and the second flat surface form a ridge line, the receiving portion and the holding portion have an acute angle portion as in the prior art. When the piston ring is inserted and set in the wrapping sleeve without being formed, and when the piston ring is taken out from the wrapping sleeve after the outer periphery processing, the piston ring can be reliably prevented from being damaged or deformed.

  According to the outer peripheral curved surface processing apparatus for a piston ring according to claim 2, the cross section of the receiving portion and the pressing portion is circular, and the first flat surface of the receiving portion and the second flat surface of the pressing portion are each in an arc shape. The maximum values of the lengths of the first flat surface and the second flat surface in the radial direction of the receiving portion and the radial direction of the holding portion are respectively 1/15 or more of the diameter of the holding portion and the diameter of the receiving portion. The necessary area of the 1st flat surface and the 2nd flat surface can be ensured, and the occurrence of an acute angle portion can be surely prevented, and the maximum value is less than 1/2 of the diameter of the holding portion and the diameter of the receiving portion, respectively. Even when the first flat surface or the second flat surface is formed, the piston ring is securely held between the inclined receiving surface and the inclined pressing surface when the outer peripheral surface is curved, and the piston ring is placed in the wrapping sleeve. Thus, a desired inclination angle can be maintained.

  According to the outer peripheral curved surface machining apparatus for a piston ring according to claim 3, since the pressing portion is configured to be movable in the axial direction of the wrapping sleeve, the diameter thereof is reduced before being attached to the wrapping sleeve. Thus, the piston ring that can be inserted into the wrapping sleeve can be pressed and inserted into the wrapping sleeve until the shaft end surface of the piston ring comes into contact with the receiving portion by the pressing portion. Therefore, the operation of removing and attaching the presser plate as in the conventional device is not required, and the piston ring can be easily mounted in the wrapping sleeve.

  Also, at this time, the piston ring in a reduced diameter state is pressed by the second flat surface of the holding portion, so that the piston ring is in relation to the axis of the wrapping sleeve while the piston ring is inserted into the wrapping sleeve. A substantially right-angled posture can be maintained, and the posture of the piston ring can be extremely collapsed during insertion, and the insertion operation can be prevented from stopping due to stagnation in the wrapping sleeve. In other words, if there is no second flat surface in the pressing part and only the inclined pressing surface, the acute angle part of the outer edge presses the piston ring in a point shape and is inserted into the wrapping sleeve. The posture of the piston ring collapses and is excessively inclined, and is caught by the cylindrical inner peripheral surface of the wrapping sleeve, making further insertion impossible. By providing the second flat surface, the piston ring can be smoothly inserted into the wrapping sleeve.

  According to the outer peripheral curved surface processing apparatus for a piston ring according to claim 4, since the receiving portion is configured to be movable in the axial direction of the wrapping sleeve, when the outer peripheral curved surface processing is finished, the receiving portion is moved, The piston ring can be easily removed from the wrapping sleeve. At this time, since the first flat surface of the receiving portion presses the piston ring, the piston ring can be moved while maintaining a substantially perpendicular posture with respect to the axis of the wrapping sleeve, and can be easily taken out.

  A piston ring outer peripheral curved surface machining apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the outer peripheral curved surface processing apparatus 1 for a piston ring includes a wrapping sleeve 10, a receiving part 20, a pressing part 30, and a ring diameter reducing part 40. The wrapping sleeve 10 is provided with a cylindrical jig 11 fixed to the outer peripheral surface side thereof, and the jig 11 is fixed to the rotary table 12. The turntable 12 is connected to a rotation drive device (not shown). Therefore, the wrapping sleeve 10 is driven to rotate about its axis 10a. The wrapping sleeve 10 has a cylindrical inner peripheral surface 10b.

  The receiving portion 20 includes a shaft portion 21 and a receiving plate 22 having a circular cross section fixed to the shaft portion 21 with a bolt (not shown). The shaft portion 21 is connected to a hydraulic cylinder (not shown) so as to be movable in the axial direction of the wrapping sleeve 10. Therefore, the receiving plate 22 is movable in the axial direction within the wrapping sleeve 10. As shown in FIG. 1, one surface of the receiving plate 22 forms an opposing surface that faces the presser portion 30, and as shown in FIG. 2, the opposing surfaces are an inclined receiving surface 22 </ b> A and a first flat surface 22 </ b> B. With. The inclined receiving surface 22 </ b> A is inclined with respect to the diameter direction of the wrapping sleeve 10, and the first flat surface 22 </ b> B extends at right angles to the axial direction of the wrapping sleeve 10, that is, in the diameter direction of the wrapping sleeve 10. A boundary line 22C between the inclined receiving surface 22A and the first flat surface 22B forms a ridge line as shown in FIG.

The pressing portion 30 includes a shaft portion 31 and a pressing plate 32 having a circular cross section that is fixed to the shaft portion 31 with a bolt (not shown) and faces the receiving plate 22 of the receiving portion 20. The shaft portion 31 is connected to a hydraulic cylinder (not shown) so as to be movable in the axial direction of the wrapping sleeve 10, and the presser plate 32 can be inserted into the wrapping sleeve 10 and can be retracted from the wrapping sleeve 10.
As shown in FIG. 1, one surface of the presser plate 32 forms an opposing surface that faces the receiving plate 22, and as shown in FIG. 3, the opposing surfaces are an inclined presser surface 32 </ b> A and a second flat surface 32 </ b> B. With. The inclined pressing surface 32A is inclined with respect to the diameter direction of the wrapping sleeve 10 and is parallel to the inclined receiving surface 22A. The second flat surface 32 </ b> B extends at right angles to the axial direction of the wrapping sleeve 10, that is, in the diametrical direction of the wrapping sleeve 10. A boundary line 32C between the inclined pressing surface 32A and the second flat surface 32B forms a ridge line as shown in FIG. The first flat surface 22B of the receiving plate 21 and the second flat surface 32B of the holding plate 32 are located on opposite sides of the wrapping sleeve 10 in the diameter direction, as shown in FIG.

  The first flat surface 22B of the receiving plate 22 and the second flat surface 32B of the holding plate 32 are arcuate as shown in FIG. 4, and the first flat surface 22 in the radial direction of the receiving plate 22 and the first flat surface 32 in the radial direction of the holding plate 32 are provided. The maximum length L of the flat surface 22B and the second flat surface 32B is not less than 1/15 and not more than 1/2 of the diameter of the holding plate 32 and the diameter of the receiving plate 21, respectively.

  The ring diameter-reduced portion 40 is located above the wrapping sleeve 10, and can be moved in the radial direction of the wrapping sleeve 10 and can be moved in the radial direction of the wrapping sleeve 10. The movable split cylinder 42 is formed in a half-cylindrical shape. In the fixed split cylinder 41, a plurality of piston rings 2 (pressure rings in the present embodiment) are stacked and arranged with their axial end surfaces overlapping each other. When the movable split cylinder 42 comes into contact with the fixed split cylinder 41, the ring diameter-reduced portion 40 is reduced in diameter in the direction in which the piston ring 2 closes its abutment 2a, and the outer peripheral surface of the piston ring 2 is the wrapping sleeve. It is comprised so that it may be in the state which can be inserted in the cylindrical internal peripheral surface 10b.

  Next, the operation of the piston ring outer peripheral curved surface machining apparatus 1 according to the embodiment of the present invention will be described. In the initial state, the plurality of piston rings 2 stacked so that the shaft end surfaces are in contact with each other are disposed on the fixed split cylinder 41 side of the ring diameter-reducing portion 40 disposed above the wrapping sleeve 10, and The push plate 32 is located above the uppermost piston ring. The receiving plate 22 stands by at a piston receiving position that is a lower position in the wrapping sleeve 10. In this state, when the movable split cylinder 42 is moved in the direction in contact with the fixed split cylinder 41 to provide a cylindrical space with a perfect cross section between the movable split cylinder 42 and the fixed split cylinder 41, the joint of the piston ring 2 is obtained. The diameter of the piston ring 2 is reduced in the direction in which 2a is closed, and the outer diameter is such that it can be inserted into the cylindrical inner peripheral surface 10b of the wrapping sleeve 10.

  In this state, a hydraulic cylinder (not shown) is operated to lower the presser 30 and the piston ring 2 is inserted into the wrapping sleeve 10 via the push plate 32. In this insertion operation, the second flat surface 32B of the push plate 32 presses the shaft end surface of the piston ring, so that the piston ring 2 is held in the wrapping sleeve 10 while maintaining a posture substantially parallel to the diameter direction of the wrapping sleeve 10. Since the piston ring 2 can be inserted, the piston ring 2 is not excessively inclined and caught by the wrapping sleeve 10, thereby preventing the insertion operation from being stopped. Further, as described above, since the maximum value L of the length of the second flat surface 32B in the radial direction of the presser plate 32 is 1/15 or more of the diameter of the presser plate 32, there is a sufficient area of the second flat surface 32B. The second flat surface 32 </ b> B can be in surface contact with the shaft end surface of the piston ring 2.

  After the uppermost piston ring 2 is inserted into the wrapping sleeve 10, the movable split cylinder 42 is separated from the fixed split cylinder 41, and the presser 30 is stopped at a predetermined position in the wrapping sleeve 10. In this state, one end surface of the lowermost piston ring P is supported by the inclined receiving surface 22A of the receiving plate 22, and the end surface of the uppermost piston ring P (the other end surface of the piston ring when one ring is inserted) ) Is supported by the inclined pressing surface 32A of the pressing plate 32, and the receiving portion 20 and the pressing portion are inclined in the same direction with respect to the diameter direction of the wrapping sleeve from the lowest piston ring to the uppermost piston ring. 30. At this time, since the first flat surface 22 and the second flat surface 32B are formed on the receiving plate 22 and the holding plate 32, there is no acute angle portion on the outer edge of the receiving plate 22 and the holding plate 32, and the piston ring Does not cause scratches or deformation.

  As described above, the maximum value L of the length of the second flat surface 32B and the first flat surface 22B in the radial direction of the presser plate 32 and the receiving plate 22 is ½ of the diameter of the presser plate 32 and the receiving plate 22. Therefore, the inclined receiving surface 22A and the inclined pressing surface 32A have a sufficient area to support the end surface of the piston ring. Further, due to this dimensional relationship, the piston ring 2 that has been in contact with the second flat surface 32B during the piston ring insertion into the wrapping sleeve 10 is inclined immediately after the lowest piston ring reaches the receiving portion 20. When the presser portion 30 is lowered by the gap due to the inclination of 22A, the piston ring that has been in contact with the first flat surface 22B and the second flat surface 32B can easily transfer to the inclined receiving surface 22A and the inclined presser surface 32B. .

  Further, since the piston ring 2 is pressed and set at a predetermined position by the movement of the presser portion 30, the piston sandwiched between the receiving plate 22 and the presser plate 32 can be set by appropriately setting the movement stroke of the presser portion 30. The number of rings is not particularly limited, and a desired number of piston rings can be subjected to curved surface processing.

  In a state where the plurality of piston rings 2 are set at predetermined positions, a part of the outer peripheral surface of the piston ring 2 is in pressure contact with the inner peripheral surface 10b of the wrapping sleeve 10 due to the self-tension of the piston ring. In this state, oil and wrapping abrasive grains are put into the wrapping sleeve 10, and the wrapping sleeve 10 is rotated about the axis 10a. As a result, a relative rotational sliding relationship occurs between the outer peripheral surface of the piston ring 2 and the inner peripheral surface 10b of the wrapping sleeve 10, and the piston ring 2 having an initially rectangular cross section as shown by the broken line in FIG. The outer peripheral surface is curved into a barrel shape as indicated by the solid line in FIG.

  When the curved surface processing is completed, first, the presser portion 30 is moved upward, and then the receiving portion 20 is moved upward, whereby the plurality of piston rings 2 on the receiving plate 22 are discharged to the outside of the wrapping sleeve 10. When the receiving part 20 is moved upward, since the first flat part 22A is formed in the receiving part 20, the piston ring 2 can be prevented from being excessively inclined and clogged in the wrapping sleeve.

  The piston ring outer peripheral curved surface machining apparatus according to the present invention is not limited to the embodiment described above, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, at the time of curved surface processing, the receiving unit 20 and the holding unit 30 are stationary and the wrapping sleeve 10 is rotated. However, the configuration is not limited to this configuration as long as relative rotation can be generated. In addition, although the drawback of the mounting property of the piston ring to the set position remains, in the configuration described in Japanese Patent Publication No. 43-6399, each of the members corresponding to the receiving plate and the holding plate is the first in the present embodiment. By forming the flat surface and the second flat surface, the problem of damage to the piston ring can be solved.

  The piston ring held between the receiving plate 22 and the presser plate 32 is a pressure ring, but may be an oil ring or an oil ring provided with a coil expander.

  INDUSTRIAL APPLICABILITY The present invention is extremely useful in the field of piston ring outer peripheral curved surface processing apparatuses, and particularly in the field of processing the outer periphery of a piston ring into a barrel shape.

The schematic sectional drawing which shows the outer peripheral curved surface processing apparatus of the piston ring by embodiment of this invention. The side view which shows the press plate of the outer peripheral curved surface processing apparatus of the piston ring by embodiment of this invention. The side view which shows the receiving plate of the outer peripheral curved surface processing apparatus of the piston ring by embodiment of this invention. The top view which shows the receiving plate or presser plate of the outer peripheral curved surface processing apparatus of the piston ring by embodiment of this invention. Sectional drawing which shows the shape of the piston ring which received the outer periphery curved surface process. The schematic sectional drawing which shows the outer peripheral curved surface processing apparatus of the conventional piston ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piston ring outer peripheral curved surface processing apparatus 2 Piston ring 10 Lapping sleeve 20 Receiving part 22 Receiving plate 22A Inclined receiving surface 22B First flat surface 22C, 32C Boundary line 30 Pressing part 32 Pressing plate 32A Inclined pressing surface 32B Second flat surface

Claims (4)

A wrapping sleeve having a cylindrical inner peripheral surface with which the outer peripheral surface of the piston ring contacts in a state where the diameter of the piston ring is reduced in the closing direction;
A receiving portion that can be disposed within the wrapping sleeve and supports one axial end surface of at least one piston ring;
A pressing portion that can be disposed in the wrapping sleeve and supports the other axial end surface of at least one piston ring;
The receiving portion and the pressing portion include an inclined receiving surface and an inclined pressing surface that are inclined with respect to the diametrical direction of the wrapping sleeve and face each other in parallel, and between the inclined receiving surface and the inclined pressing surface. Holding the piston ring inclined in the wrapping sleeve;
A piston ring in which the outer periphery of the piston ring is barrel-shaped in combination with the self-tensioning property of the piston ring by rotating the wrapping sleeve and the receiving part or the presser part relative to each other about the axis of the wrapping sleeve. In the outer peripheral curved surface processing apparatus,
A first flat surface perpendicular to the axis is formed on the surface of the receiving portion facing the presser portion, following the inclined receiving surface,
A second flat surface perpendicular to the axial center is formed on the surface of the pressing portion facing the receiving portion, following the inclined surface pressing surface, and the first flat surface and the second flat surface are formed on the wrapping sleeve. Piston rings, which are located opposite to each other in the diametrical direction, and a boundary line between the inclined receiving surface and the first flat surface and a boundary line between the inclined pressing surface and the second flat surface form a ridge line Peripheral curved surface processing equipment.   The receiving portion and the pressing portion have a circular cross section, and the first flat surface of the receiving portion and the second flat surface of the pressing portion each have an arc shape, and the radial direction of the receiving portion, the pressing portion The maximum values of the lengths of the first flat surface and the second flat surface in the radial direction of the portion are 1/15 and 1/2 of the diameter of the holding portion and the diameter of the receiving portion, respectively. The outer peripheral curved surface machining apparatus for a piston ring according to claim 1, characterized in that:   3. The piston ring outer peripheral curved surface machining apparatus according to claim 1, wherein the pressing portion is configured to be movable in the axial direction of the wrapping sleeve.   4. The piston ring outer peripheral curved surface machining apparatus according to claim 1, wherein the receiving portion is configured to be movable in the axial direction of the wrapping sleeve.

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