JP5859048B2 - Piston ring and metal rectangular wire for piston ring - Google Patents

Description

  The present invention relates to a piston ring mounted on a piston in an engine and a metal rectangular wire for manufacturing the piston ring.

  The piston ring is a member in which a metal rectangular wire is formed in a C shape in plan view, and is used by being fitted into a ring groove formed on the outer peripheral surface of the piston (see Patent Document 1 below).

  The piston ring having a C-shape in plan view is slidably in contact with an inner peripheral surface of a cylinder in which the piston is reciprocally moved to ensure sealing between the piston and the cylinder, and is attached to the piston. Of the outer surface of the upper surface, the lower surface, the inner surface (the radially inner surface facing the direction of the piston) and the outer surface (the radially outer surface that is in sliding contact with the inner circumferential surface of the cylinder). It is necessary to finish the surface roughness particularly finely.

  Here, the piston ring first forms the upper surface, the lower surface, the inner side surface, and the outer side surface in the state of forming four surfaces in a long metal rectangular wire, that is, in a C-shape in a plan view. The upper surface forming surface, the lower surface forming surface, the inner surface forming surface, and the outer surface forming surface are polished, and then the long rectangular metal wire is bent into a C shape in plan view.

  As described above, in the piston ring, it is necessary to form the outer surface smoothly. That is, when polishing the long metal rectangular wire, the outer surface forming surface has a surface roughness smaller than the surface roughness of the other three surfaces, and Thereafter, when the long metal rectangular wire is bent into a C-shape in plan view, the outer surface forming surface needs to be formed so as to form an outer surface that faces radially outward. is there.

  Therefore, in the stage before the long metal rectangular wire is polished and then bent into a C-shape in plan view, which of the outer surfaces is the outer surface forming surface. Need to be identified by the manufacturer. Enabling this discrimination is particularly effective when the metal rectangular wire has a symmetrical shape in the cross section.

  Conventionally, for example, at least one outer surface such as the upper surface forming surface or the lower surface forming surface is colored on the long metal rectangular wire after polishing and before bending. Alternatively, marking is performed by plastic deformation such as a dent.

  However, this conventional configuration requires a separate process such as a color removal process or a plastic deformation correction process after the bending process, resulting in high costs.

JP 2003-220525 A

  The present invention has been made in view of such a conventional technique, and without adding a separate process, in a stage before bending a metal flat wire into a C-shape in a plan view, it is radially outward after bending. It is an object of the present invention to provide a piston ring that can identify the outer surface facing the surface, thereby reducing the manufacturing cost, and a metal rectangular wire for manufacturing the piston ring.

In order to achieve the above object, the present invention provides a C-shaped piston ring formed from a metal rectangular wire in a plan view, and has an upper surface and a lower surface that are directed upward based on the state of being attached to the piston. A piston ring having four outer surfaces including a lower surface facing, an inner surface facing radially inward, and an outer surface facing radially outward, wherein one of the four outer surfaces is a predetermined outer surface. A piston ring is provided in which an abrasive line is formed along a direction different from the abrasive line on the outer surface of the piston ring.

  In one aspect, the rectangular wire has a rectangular shape whose cross-sectional shape is defined by a pair of long sides and a pair of short sides, and an outer surface including each of the pair of long sides forms the upper surface and the lower surface. The outer surface including each of the pair of short sides forms the inner side surface and the outer side surface.

  In this case, preferably, the one outer surface specified in advance is one of the upper surface and the lower surface, and one of the upper surface and the lower surface is formed with a polishing line along a first direction, and the upper surface and On the other side of the lower surface, polishing streaks are formed along a second direction different from the first direction.

  Preferably, the first direction is a direction inclined by a predetermined angle with respect to the longitudinal direction of the rectangular wire, and the second direction is a direction along the longitudinal direction.

  In order to achieve the above object, the present invention is a piston ring metal rectangular wire for manufacturing a C-shaped piston ring to be mounted on a piston in plan view. One specified outer surface is provided with a metal square wire for a piston ring in which polishing bars along a direction different from the polishing bars on the other outer surface are formed.

  In one embodiment, the cross-sectional shape is a rectangular shape defined by a pair of long sides and a pair of short sides, and an outer surface including each of the pair of long sides is an upper surface facing upward when mounted on the piston And an upper surface forming surface and a lower surface forming surface that form a lower surface facing downward, and an outer surface that includes each of the pair of short sides is an inner surface that faces radially inward and a radially outer surface when mounted on the piston. The inner side surface forming surface and the outer side surface forming surface that form the exterior surface facing in the direction are used.

  In this case, preferably, the one specified outer surface is one of the upper surface forming surface and the lower surface forming surface, and one of the upper surface forming surface and the lower surface forming surface is polished along a first direction. A streak is formed, and a polishing streak along a second direction different from the first direction is formed on the other of the upper surface forming surface and the lower surface forming surface.

  Preferably, the first direction is a direction inclined by a predetermined angle with respect to the longitudinal direction of the rectangular wire, and the second direction is a direction along the longitudinal direction.

  According to the piston ring and the metal rectangular wire for the piston ring according to the present invention, one of the four outer surfaces is preliminarily specified with one polishing surface along a direction different from that of the other outer surface. Therefore, without adding a separate process, it is possible to identify the outer surface facing outward in the radial direction after bending at the stage before bending the metal rectangular wire into a C-shape in plan view. As a result, the manufacturing cost of the piston ring can be reduced as much as possible.

FIG. 1 is a plan view of a piston ring according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a perspective view of a rectangular metal wire used for manufacturing the piston ring shown in FIG. FIG. 4 is an image showing an example of the polishing streak along the direction inclined at an angle smaller than 90 degrees with respect to the longitudinal direction of the flat wire. FIG. 5 is an image showing an example of the polishing streak along the direction orthogonal to the longitudinal direction of the flat wire. FIG. 6 is an image showing an example of the polishing streak along the longitudinal direction of the rectangular wire. 7 (a) to 7 (c) are schematic diagrams for explaining a polishing process using the polishing apparatus of the first example, which is a polishing process when manufacturing the piston ring, and FIG. ) To (c), respectively, when the direction of the polishing streak generated during the polishing step is parallel to the longitudinal direction of the rectangular wire, when inclined at an angle smaller than 90 degrees, and when orthogonal Is shown. FIGS. 8A and 8B are schematic diagrams for explaining a polishing process using the polishing apparatus of the second example, which is a polishing process when the piston ring is manufactured. (B) and (b) show the case where the direction of the polishing streak generated in the polishing step is inclined at an angle smaller than 90 degrees with respect to the longitudinal direction of the flat wire, and the case where the direction is perpendicular thereto. FIGS. 9A and 9B are schematic views for explaining a polishing process using the polishing apparatus of the second example, which is a polishing process when manufacturing the piston ring. (B) and (b) show the case where the direction of the polishing streak generated in the polishing step is inclined at an angle smaller than 90 degrees with respect to the longitudinal direction of the flat wire, and the case where the direction is perpendicular thereto.

  Hereinafter, an embodiment of a piston ring according to the present invention will be described with reference to the accompanying drawings.

  1 and 2 show a plan view of the piston ring 1 according to the present embodiment and a cross-sectional view taken along the line II-II in FIG. 1, respectively.

  The piston ring 1 is a member that is mounted on an outer peripheral surface of a piston of an engine and is in sliding contact with an inner peripheral surface of a cylinder in which the engine is reciprocally accommodated.

  As shown in FIGS. 1 and 2, the piston ring 1 has a C-shape in plan view, and the upper surface 11 facing upward, the lower surface 12 facing downward, based on the state of being mounted on the piston, It has an inner surface 13 that faces radially inward and an outer surface 14 that faces radially outward.

The piston ring 1 is manufactured using a long metal rectangular wire 50 having a rectangular cross section.
FIG. 3 is a perspective view of the metal rectangular wire 50.
As the metal rectangular wire 50, for example, a stainless steel material, a casting material, a cast steel material, a steel material, or the like is used.

  As shown in FIG. 3, the metal rectangular wire 50 includes an upper surface forming surface 51, a lower surface forming surface 52, and an inner surface forming surface that form the upper surface 11, the lower surface 12, the inner surface 13, and the outer surface 14, respectively. 53 and an outer surface forming surface 54.

  The said piston ring 1 carries out predetermined grinding | polishing with respect to the four outer surfaces 51-54 of the said metal flat wire 50, and bends the said metal flat wire 50 in planar view C shape after that, Manufactured.

Here, the piston ring 1 is in sliding contact with the inner peripheral surface of the cylinder on the outer surface 14.
Therefore, in the piston ring 1, it is necessary to make the surface roughness of the outer surface 14 finer than the surface roughness of the other upper surface 11, the lower surface 12 and the inner surface 13.

  In order to obtain the piston ring 1 in which the surface roughness of the outer surface 14 is finer than that of the other three surfaces 11 to 13, the outer surface forming surface 54 is formed during the polishing process for the metal rectangular wire 50. Is made finer than the surface roughness of the upper surface forming surface 51, the lower surface forming surface 52 and the inner surface forming surface 53, and the metal rectangular wire 50 thus polished is used as the outer surface forming surface. It is necessary to bend and mold in a C shape in plan view so that 54 faces radially outward.

  Then, the metal rectangular wire polished so that the surface roughness of the outer surface forming surface 54 is finer than the surface roughness of the other three surfaces 51 to 53, the outer surface forming surface 54 is radially outward. In order to bend in a C-shape in plan view so as to face the metal, it is necessary to make the outer surface forming surface 54 identifiable when the metal flat wire 50 is in a long state after the polishing process and before the bending process. There is.

  For example, at the stage after polishing and before bending, marking is performed on the outer surface of any one of the long metal rectangular wires by plastic deformation such as coloring or dent, and the outer surface is bent by this marking after bending. It is also possible to identify the outer surface to be formed.

  However, with this configuration, after the bending process, separate processes such as a color removal process and a plastic deformation part correction process are required, resulting in high costs.

  In this regard, in the piston ring 1 according to the present embodiment, a polishing bar along a direction different from the polishing bar on the other outer surface is provided on one outer surface specified in advance among the four outer surfaces. Is formed.

  In addition, the polishing streak along a direction different from the other outer surface is, for example, a polishing streak along a direction inclined by a predetermined angle with respect to the longitudinal direction of the flat wire 50 (see FIG. 4), or A polishing bar (see FIG. 5) along a direction orthogonal to the longitudinal direction of the flat wire 50 can be used.

  According to the piston ring 1 having such a configuration, the outer surface forming surface 54 that should form the outer surface 14 after bending is subjected to a polishing process on the rectangular wire 50 without adding another process, and It can be identified at a stage before the bending process.

  Therefore, the metal rectangular wire 50 can be bent so that the outer surface forming surface 54 forms the outer surface 14, and the manufacturing cost of the piston ring 1 can be reduced as much as possible. Can do.

  In the present embodiment, as shown in FIGS. 2 and 3, the metal rectangular wire 50 has a rectangular shape whose cross-sectional shape is defined by a pair of long sides 50 a and a pair of short sides 50 b, The metal rectangular wire 50 is bent in an edgewise direction, that is, is bent so that one of the pair of short sides 50b is located radially inward, so that the piston ring having a C-shape in plan view is obtained. 1 is formed.

  In this case, two outer surfaces each including a pair of long sides 50a among the four outer surfaces 51 to 54 in the metal rectangular wire 50 can be identified as the upper surface forming surface 51 and the lower surface forming surface 52, Two outer surfaces each including the pair of short sides 50b can be identified as the inner surface forming surface 53 and the outer surface forming surface 54.

  In such a configuration, preferably, one of the upper surface forming surface 51 and the lower surface forming surface 52 is formed with polishing streaks along the first direction, and the other of the upper surface forming surface and the lower surface forming surface is the first. A polishing streak along a second direction different from the one direction can be formed.

  For example, the first direction is a direction inclined at an angle smaller than 90 degrees with respect to the longitudinal direction (see FIG. 4), and the second direction is a direction along the longitudinal direction (see FIG. 6). Can do.

  According to such a configuration, the outer surface forming surface 54 can be more clearly identified at the stage before the bending by comparing the direction of the polishing bar of the upper surface forming surface 51 and the direction of the polishing bar of the lower surface forming surface 52. It can be done reliably.

Here, the direction of the polishing streak generated in the polishing step will be described.
In the polishing step, the rectangular wire 50 is moved in the longitudinal direction with the outer surface (surface to be polished) of the metal rectangular wire 50 facing the polishing device 70 (see FIGS. 7 to 9 below). This is performed by causing the polishing apparatus to act on the outer surface while being conveyed, and polishing streaks are formed on the surface to be polished during this polishing step.

  The polishing apparatus 70 includes, for example, a rotating shaft 71 that is driven to rotate about an axis, and a substantially cylindrical polishing member 72 supported by the rotating shaft 71, and a polishing member 72 whose outer peripheral surface is a polishing surface. And can have

  In this case, as shown in FIG. 7 (a), the rotating shaft 71 is in the conveying direction of the flat wire 50 with the outer peripheral surface of the polishing member 72 facing the surface to be polished of the flat wire 50. The rotating shaft 71 is arranged so as to be orthogonal to each other, and in this state, the rotating shaft 71 is rotated around the axis line while the metal rectangular wire 50 is conveyed along the longitudinal direction, so that the polishing member 72 is covered with the object to be covered. By acting on the polishing surface, polishing streaks (see FIG. 6) along the longitudinal direction of the flat wire 50 can be formed on the surface to be polished.

  On the other hand, as shown in FIG. 7 (b), the rotating shaft 71 moves in the conveying direction of the flat wire 50 with the outer peripheral surface of the polishing member 72 facing the surface to be polished of the flat wire 50. The rotating shaft 71 is disposed so as to be inclined at an angle smaller than 90 degrees, and in this state, the rotating shaft 71 is rotated around the axis while the metal rectangular wire 50 is conveyed along the longitudinal direction. By causing the polishing member 72 to act on the surface to be polished, polishing bars along the direction inclined at an angle smaller than 90 degrees with respect to the longitudinal direction of the flat wire 50 on the surface to be polished (see FIG. 4). ) Can be formed.

  Further, as shown in FIG. 7 (c), the rotating shaft 71 is parallel to the conveying direction of the flat wire 50 with the outer peripheral surface of the polishing member 72 facing the surface to be polished of the flat wire 50. The rotating shaft 71 is arranged as described above, and in this state, while the metal rectangular wire 50 is conveyed along the longitudinal direction, the rotating shaft 71 is rotated about the axis to move the polishing member 72 to the surface to be polished. By acting on the polishing surface, polishing streaks (see FIG. 5) along the direction orthogonal to the longitudinal direction of the flat wire 50 can be formed on the surface to be polished.

The polishing apparatus 70 is not limited to the configuration having the rotating shaft 71 and the polishing member 72.
For example, the polishing apparatus 70 includes a support shaft 75 that is reciprocated along an axial direction, and a polishing member 76 that is supported by the support shaft 75, and a surface that faces the surface to be polished is a polishing surface. And a polishing member 76.

  In this case, the support shaft 75 is arranged so that the support shaft 75 is parallel to the conveying direction of the flat wire 50 with the polishing surface of the polishing member 76 facing the surface to be polished of the flat wire 50. In this state, while the metal rectangular wire 50 is conveyed along the longitudinal direction, the support shaft 75 is reciprocated along the axial direction to cause the polishing member 76 to act on the surface to be polished. Thus, polishing streaks (see FIG. 6) along the longitudinal direction of the flat wire 50 can be formed on the surface to be polished.

  On the other hand, as shown in FIG. 8A, the support shaft 75 moves in the conveying direction of the flat wire 50 with the polishing surface of the polishing member 76 facing the surface to be polished of the flat wire 50. The support shaft 75 is disposed so as to be inclined at an angle smaller than 90 degrees, and in this state, the support shaft 75 is reciprocated along the axial direction while the metal rectangular wire 50 is conveyed along the longitudinal direction. By causing the polishing member 76 to act on the surface to be polished by moving the polishing member 76, a polishing streak along the direction inclined at an angle smaller than 90 degrees with respect to the longitudinal direction of the flat wire 50 ( 4) can be formed.

  Further, as shown in FIG. 8 (b), the support shaft 75 moves in the conveying direction of the flat wire 50 with the polishing surface of the polishing member 76 facing the surface to be polished of the flat wire 50. The support shaft 75 is disposed so as to be orthogonal to each other, and in this state, while the metal rectangular wire 50 is conveyed along the longitudinal direction, the support shaft 75 is reciprocated along the axial direction to polish the polishing member 76. By acting on the surface to be polished, polishing streaks (see FIG. 5) along the direction orthogonal to the longitudinal direction of the flat wire 50 can be formed on the surface to be polished.

  Instead, the polishing apparatus 70 is wound around a driving roller 81 that is driven to rotate about an axis, a driven roller 82 that is arranged in parallel to the driving roller 81, and the driving roller 81 and the driven roller 82. The endless polishing member 83 may be configured to have a polishing member 83 whose outer surface is a polishing surface.

  In this case, the axial direction of the driving roller 81 and the driven roller 82 is orthogonal to the conveying direction of the flat wire 50 with the polishing surface of the polishing member 83 facing the surface to be polished of the flat wire 50. In this state, the driving roller 81 and the driven roller 82 are arranged, and while the metal rectangular wire 50 is transported along the longitudinal direction, the driving roller 81 is driven to rotate about the axis, thereby the polishing member. By causing 83 to act on the surface to be polished, polishing streaks (see FIG. 6) along the longitudinal direction of the flat wire 50 can be formed on the surface to be polished.

  On the other hand, as shown in FIG. 9 (a), the axial directions of the driving roller 81 and the driven roller 82 are set so that the polishing surface of the polishing member 83 faces the surface to be polished of the flat wire 50. The driving roller 81 and the driven roller 82 are arranged so as to be inclined at an angle smaller than 90 degrees with respect to the conveyance direction of the flat wire 50, and in this state, the metal flat wire 50 is conveyed along the longitudinal direction. However, the drive roller 81 is driven to rotate about the axis to cause the polishing member 83 to act on the surface to be polished, whereby the surface to be polished has an angle smaller than 90 degrees with respect to the longitudinal direction of the flat wire 50. A polishing streak (see FIG. 4) along the inclined direction can be formed.

  Further, as shown in FIG. 9 (b), the axial direction of the driving roller 81 and the driven roller 82 is the rectangular wire with the outer peripheral surface of the polishing member 83 facing the surface to be polished of the flat wire 50. The driving roller 81 and the driven roller 82 are arranged so as to be parallel to the conveying direction of 50, and in this state, while driving the metal rectangular wire 50 along the longitudinal direction, the driving roller 81 is rotated around the axis. The polishing member 83 is caused to act on the surface to be polished by rotationally driving the polishing member 83, so that the polishing surface along the direction perpendicular to the longitudinal direction of the rectangular wire 50 is provided on the surface to be polished (see FIG. 5). Can be formed.

DESCRIPTION OF SYMBOLS 1 Piston ring 11 Upper surface 12 Lower surface 13 Inner side surface 14 Outer side surface 50 Metal flat wire 50a Long side 50b Short side 51 Upper surface formation surface 52 Lower surface formation surface 53 Inner surface formation surface 54 Outer surface formation surface

Claims (6)

A piston ring having a C-shape in plan view, formed from a rectangular metal wire, with the upper surface facing upward, the lower surface facing downward, the inner surface facing radially inward, and the state attached to the piston, and In a piston ring having four outer surfaces including an outer surface facing radially outward,
One of the four outer surfaces is a piston ring characterized in that a polishing streak along a direction different from a polishing streak on the other outer surface is formed on one outer surface specified in advance. The rectangular wire has a rectangular shape whose cross-sectional shape is defined by a pair of long sides and a pair of short sides,
The outer surfaces each including the pair of long sides form the upper surface and the lower surface, and the outer surfaces each including the pair of short sides form the inner surface and the outer surface,
The one specified outer surface is one of the upper surface and the lower surface,
A polishing streak along a first direction is formed on one of the upper surface and the lower surface, and a polishing streak along a second direction different from the first direction is formed on the other of the upper surface and the lower surface. The piston ring according to claim 1.   The first direction is a direction inclined by a predetermined angle with respect to a longitudinal direction of the rectangular wire, and the second direction is a direction along the longitudinal direction. piston ring. A metal rectangular wire for a piston ring for producing a C-shaped piston ring to be attached to the piston in plan view,
A rectangular metal wire for a piston ring, wherein a predetermined one of the four outer surfaces is provided with a polishing bar along a direction different from a polishing bar on the other outer surface. The cross-sectional shape is a rectangular shape defined by a pair of long sides and a pair of short sides,
The outer surfaces each including the pair of long sides are an upper surface forming surface and a lower surface forming surface that form an upper surface facing upward and a lower surface facing downward when mounted on the piston, and each includes the pair of short sides. The outer surface is an inner surface forming surface and an outer surface forming surface forming an inner surface facing radially inward and an exterior surface facing radially outward in a state where the outer surface is mounted on the piston,
The one outer surface specified in advance is one of the upper surface forming surface and the lower surface forming surface,
One of the upper surface forming surface and the lower surface forming surface is formed with a polishing line along a first direction, and the other of the upper surface forming surface and the lower surface forming surface is along a second direction different from the first direction. 5. A metal rectangular wire for a piston ring according to claim 4, wherein a polishing bar is formed.   6. The first direction according to claim 5, wherein the first direction is a direction inclined by a predetermined angle with respect to a longitudinal direction of the rectangular wire, and the second direction is a direction along the longitudinal direction. Metal rectangular wire for piston rings.