JP2958669B2 - Method and apparatus for assembling oil ring to piston - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for assembling an oil ring comprising a spacer ring and a pair of side rail rings superposed on both sides of the ring in a piston ring groove of a piston.

[0002]

2. Description of the Related Art Conventionally, when assembling an assembled oil ring, a spacer ring is first assembled in a piston ring groove.
Each side rail ring is sequentially assembled to each groove formed between the ring and the upper and lower groove surfaces of the piston ring groove. As shown in JP-B-58-2020, JP-B-61-19376, and JP-B-61-16020, the assembly of these spacer rings and side rail rings has a larger diameter than the outer diameter of the piston. The guide member is positioned with respect to the piston, and a ring mounted on the outer periphery of the guide member is pushed out from the tip of the guide member. Then, three types of guide members, one for the spacer ring, one for the upper side rail ring, and one for the lower side rail ring, are prepared, and the spacer ring and the upper side are used by using corresponding guide members at mutually different assembling stations. The side rail ring and the lower side rail ring are separately assembled.

[0003]

In the above prior art, it is necessary to provide three stages of front and rear assembling stations for the spacer ring, the upper side rail ring, and the lower side rail ring. However, there is a problem that the equipment cost increases as the length of the equipment increases. The present invention has been made in view of the above points,
It is intended that a single mounting station be able to assemble the spacer ring and the pair of side rail rings.

[0004]

In order to achieve the above object,
The device of the present invention is a device for assembling an oil ring comprising a spacer ring and a pair of side rail rings superimposed on both side surfaces of the ring into a piston ring groove of the piston, wherein the oil ring has a diameter larger than the outer diameter of the piston. The positioning can be set relative to the piston such that the tip is substantially at the same level as the groove surface on one side of the piston ring groove, and the spacer ring and a pair of side rail rings are provided on the outer periphery at the frontmost position toward the tip. A guide member that can be mounted so that the spacer ring and a pair of side rail rings are located at the rear thereof;
An extruding means for sequentially extruding the spacer ring and the pair of side rail rings from the tip of the guide member;
It is free to advance and retreat in different radial directions, and a gap facing a groove formed between the groove surface on one side of the piston ring groove and the spacer ring attached to the piston ring groove with respect to the tip of the guide member. And a plurality of restricting members that can be opposed to each other .

[0005]

The guide member is positioned and set on the piston, and the pushing means is operated. First, the spacer ring is pushed out from the tip of the guide member and assembled into the piston ring groove. Next, the front side rail ring of the pair of side rail rings is pushed out. At this time, the regulating member is opposed to the guide member with a gap therebetween. A rail ring is assembled through the gap into a groove formed between the spacer ring and a groove surface on one side of the piston ring groove. Finally, the rear side rail ring is pushed out in a state in which the restricting member is retracted outward in the radial direction. At this time, since the side rail ring is not restricted from the front side in the axial direction, FIG. b) As shown in (c), a wave is formed, and a wave-form portion curved and projected forward of the guide member reaches a position facing a groove formed between the spacer ring and the other surface of the piston ring groove. . Therefore, when the side rail ring is completely pushed out of the guide member, the other part of the side rail ring is moved into the groove by the elastic restoring force of the side rail ring starting from the wavy portion, and the side rail is inserted into the groove. The ring is assembled. If the arriving position of the wavy portion greatly exceeds the position facing the groove, an assembling error occurs in the groove, and the piston is pushed out of the guide member to a position substantially at the same level as the groove surface on the other side of the piston ring groove. It is desirable to dispose a second regulating member for receiving the rear side rail ring. By the way, the side rail ring is very thin, so that there is a possibility that the side rail ring is also extruded when the spacer ring is extruded. In this case, a space is provided between the spacer ring mounted on the guide member and the front side rail ring of the pair of side rail rings so that the regulating member can be freely moved in the axial direction of the guide member. The regulating member is inserted into the space between the spacer ring and the front side rail ring by the axial movement and the radial movement of the regulating member, and in this state, the regulating member is moved forward in the axial direction of the guide member to form the spacer ring. If you try to extrude
The side rail ring can be prevented from being pushed out together with the spacer ring, and the regulating member can be moved to the position opposite to the leading end of the guide member with the above-mentioned gap after the spacer ring is pushed out. And the work efficiency is improved. In this case, there is provided a pressing member which is in contact with the rear side rail ring and is movable in the axial direction of the guide member, and the pressing member and the restricting means constitute the pushing means.
In this device, the regulating means can be moved in the axial direction by a dedicated driving source different from the pressing member.However, the regulating means is urged toward the axial direction of the guide member so that the regulating member and the pressing member can be moved. If one of the ends is provided with a seat that abuts the other, and the pressing member is configured to push the regulating member forward in the axial direction of the guide member, a driving source for the regulating member is not required, which is advantageous. is there. In this case, when the axial distance between the tip of the guide member and the groove surface on one side of the piston ring groove is A, the protruding length of the abutment is B, and the plate thickness of the side rail ring is t, 0 ≦ A < t / 2 and 2t <B <2t
If it is set so as to be + t / 2, by appropriately restricting the movement position of the regulating member toward the front in the axial direction with a stopper or the like, the tip of the guide member and the regulating member at the time of pushing out the front side rail ring are pushed out. And a gap through which the front side rail ring can pass is secured, and the regulating member functions as a stopper for the pressing member, so that the rear side rail ring can be reliably prevented from being pushed out. By the way, when assembling the front side rail ring into the piston ring groove, the spacer ring which is dragged by the contraction of the side rail ring at the abutting portion of the spacer ring is used.
Both ends may overlap. In this case, the guide
The inner end surface of the regulating member facing inward in the radial direction of the member is opposed to the abutment portion of the spacer ring, and the distance from the center of the inner end surface to the center of the piston is such that the both ends of the spacer ring overlap each other. If it is set to be smaller than the outer diameter of the portion , overlapping of both ends is prevented by interference with the inner end surface. Also, if an engagement piece that engages with the gap at the abutment portion of the spacer ring attached to the guide member is provided on the surface of the guide member facing the axial direction of the guide member of the regulating member,
When the spacer ring is pushed out of the guide member and assembled into the piston ring groove, it is possible to prevent both ends from overlapping. still,
It is optional to perform either the step of setting the guide member on the piston or the step of attaching the ring to the guide member first, but the guide member is supported and the guide member is set on the piston. A flexible set jig is provided, and the set jig is circulated to a supply station for the spacer ring, a supply station for the side rail ring, and an assembly station in which the pushing means and the regulating member are arranged. For example, after attaching a spacer ring and a side rail ring to the guide member on the set jig at each supply station, the set jig is moved so as to be extrapolated to the piston at the assembly station, and the guide member is set on the piston. It is possible to automate all processes including the guide member setting process, After the ring assembling step, the guide member is detached from the piston by the set jig, the piston is discharged from the assembling station, and the guide member is circulated to each supply station, and the next piston to be charged into the assembling station. As a result, the assembly work can be performed efficiently even when the number of guide members used is reduced. In this case, the set jig is urged and supported in a direction separating from the piston by a support frame that is circulated and moved between the supply station of the spacer ring, the supply station of the side rail ring, and the assembling station. If the set jig is configured to be pushed toward the piston, a dedicated drive source for inserting and removing the set jig from and to the piston is not required, and the structure can be simplified to further reduce the equipment cost.

[0006]

In the embodiment shown in the drawings, an oil ring composed of a spacer ring S shown in FIG. 13 and a pair of side rail rings R superimposed on the spacer ring S is assembled in a third-stage piston ring groove G of the piston P. It is something to attach. The spacer ring S is bent and formed into a waveform in the circumferential direction as shown in FIG. 13A, and small protrusions S1 are formed at the inner diameter side ends of the upward and downward crests as shown in FIG. 13B. When the spacer ring S is mounted on the piston ring groove G, the space between the ring S and the upper and lower groove surfaces of the ring groove G is as shown in FIG.
As shown in (c), each groove GU, GL was secured, and each upper and lower side rail ring R was assembled to each groove GU, GL.

FIG. 1 shows an assembling line of an assembled oil ring. From a starting end of the line, a supply station 1 for a spacer ring, a supply station 2 for a side rail ring, a ring separation station 3, and a ring assembly station 2, the piston P is fitted upwardly into a cylindrical jig 50 on a pallet 5 which is tact-fed along the line, and has a diameter larger than the outer diameter of the piston P as shown in FIG. The guide member 6 is fitted to the piston P from above, and in this state, the piston P is
4 sequentially. The guide member 6 has a seat plate 60 at the lower part of the inner periphery thereof, which is in contact with the top surface of the piston P, and is positioned on the piston P such that the lower end of the guide member 6 is at the same level as the upper groove surface of the piston ring groove G. Set. Further, a sleeve 51 having an upper end flange 51a inserted between an upper end thereof and a lower end of the guide member 6 is externally inserted into the jig 50 by urging the upper end thereof with a spring 52 and the outer side of the jig 50. The upward movement of the sleeve 51 is restricted by the stopper 53 provided at the position where the flange 51a contacts the lower end of the guide member 6.

In the assembling line, first, at the spacer ring supply station 1, one pair of upper and lower pairs of spacer rings S, which are held in a stacked state on a magazine 11 erected on a stand 10 above the line, are provided on the stand 10. A drop mechanism 12 composed of a shutter drops the guide member 6 on the small-diameter portion 61 at the upper end of the guide member 6. Then, at the supply station 2 of the side rail ring, the side held in a stacked state on a magazine 21 erected on a stand 20 above the line. The two rail rings R are sequentially dropped on the small diameter portion 61 of the guide member 6 by the cutting mechanism 22 provided on the lower surface of the gantry 20, and then these spacer rings S and the two side rail rings R, R are separated from each other by the ring separation station 3. At the lower end of the guide member 6 through the intermediate tapered portion 62 to the large-diameter portion 63 at the lower end. Both spacer ring S and the side rail ring R, and the like by separating the R spacing therebetween.

To explain this in detail, the separation station 3 includes a cylinder 31 erected on a gantry 30 above the line.
A movable frame 32 which is raised and lowered via a rod 32a is provided. A plurality of, for example, four arm-shaped pressing members 33 which are vertically long so as to surround the guide member 6 are provided on the lower surface of the movable frame 32. As clearly shown in FIG.
3a is pivotable in the radial direction with the fulcrum as the fulcrum and the spring 33b
The arm 33 is urged inward in the radial direction, and the arm 33 is attached to the lower end thereof. At the lower end of the arm 33, an abutment 33c is attached to abut the peripheral surface of the guide member 6. , And the lower side rail ring R and the lower side spacer ring S
Are pushed down to the large diameter portion 63 via the tapered portion 62 of the guide member 6. In the figure, reference numeral 33d denotes a pair of stopper bolts provided near the pivot portion of each arm 33 to regulate the swing range of the arm 33. An air nozzle 34 is attached to each of the pressing members 33 and is inclined obliquely downward toward the inside in the radial direction. The air nozzles 34 eject air from the air nozzle 34 during or after the movable frame 32 is lowered. Here, since each side rail ring R is thin and has low rigidity in the thickness direction, the side rail rings R are curved so as to somewhat wavy in the thickness direction with an increase in diameter, and are located between the upper and lower side rail rings R, R and the lower side. A gap is formed between the side rail ring R and the spacer ring S by waving, and air from the air nozzle 34 is blown into the gap between the lower side rail ring R and the spacer ring S. Since the spacer ring S is bent and formed into a waveform as described above, the contraction force is weak. As a result, only the spacer ring S is blown down by the air from the air nozzle 34, and the lower side rail ring R and the spacer ring S The interval between is wide open. The lower end of the guide member 6 is in contact with the flange 51a at the upper end of the sleeve 51 extrapolated to the jig 50, so that the spacer ring S does not fall off the guide member 6.

As shown in FIGS. 4 and 5, the assembling station 4 is provided with a downward cup-shaped pressing member which can be externally inserted into the guide member 6 and which is raised and lowered by a cylinder 41 which is provided upright on a frame 40 above the line. 42, and a pair of regulating members 43, 43 which are inserted in the space between the lower side rail ring R and the spacer ring S opened in the separation station 3 and which can move up and down in the radial direction and can move up and down. Is provided. Each regulating member 43 is formed of a flat plate whose inner end in the radial direction is concavely formed in an arc shape, and a support frame 43b screwed to a lower surface of an outer end portion of each regulating member 43 is fixed to a guide rail 44b by a cylinder 44a. As shown in FIG. 6, the movable frame 44 is moved up and down along a pair of guide bars 44c, 44c implanted in the movable frame 44, and is externally inserted into each of the bars 44c. Spring 44
d, the supporting frame 43b is urged upward to be supported, and the upward movement of the supporting frame 43b is regulated by a washer 44e bolted to the top of the guide bar 44c in a through hole 43c formed in the regulating member 43. Normally, the ring is kept at a level facing the interval between the two rings R and S.

The center of the support frame 43b is recessed downward, and a sleeve operation plate 45 is slidably inserted in a radial direction between the support frame 43b and the regulating member 43, and is arranged in parallel above the cylinder 44a. The piston rod of the cylinder 45a is pin-engaged with a vertically long hole 45c formed in a standing piece 45b at the outer end of the operation plate 45, and the operation plate 45 is
The operation plate 45 can be moved up and down integrally with the cylinder 51a so as to be able to advance and retreat independently in the radial direction, and the operation plate 45 is extended inward in the radial direction to extend to the outer edge of the flange 51a at the upper end of the sleeve 51. It is possible to freely switch between an operating position facing the upper side of the extending portion 51b and an escape position which is separated from the extending portion 51b by retreating outward in the radial direction. Note that a step surface 51c, which is lower by the thickness of the side rail ring R, is formed on the outer peripheral portion of the flange inside the extension portion 51b as clearly shown in FIG.

At the lower end of the pressing member 42, a contact seat 42a which can contact the regulating member 43 is protruded at a portion near the outer periphery which does not contact the upper side rail ring R, and the protruding length of the contact seat 42a. The length B is set to 2t <B <2t + t / 2, where t is the plate thickness of the side rail ring R. Note that the vertical distance between the lower end of the guide member 6 and the upper groove surface of the piston ring groove G is set to 0 ≦ A <t / 2, where A is this. In the illustrated example, A = 0
"A" is entered in the drawing because it cannot be shown
I haven't.

Next, the procedure for assembling the ring at the assembling station 4 will be described with reference to FIG. After the piston P is carried into the assembling station 4, the regulating member 43 is first advanced inward in the radial direction to regulate the space between the lower side rail ring R and the spacer ring S as shown in FIG. While the member 43 is inserted, the sleeve operation plate 45 is switched to the inward operation position, and the pressing member 42 is lowered in this state. According to this, the lower end surface of the pressing member 42 abuts on the upper side rail ring R, and the ring R and the lower side rail ring R are pushed down.
2a comes into contact with the regulating member 43, and the regulating member 43 is pushed down. At this time, the sleeve operation plate 45 is also pushed down integrally with the regulating member 43 so that the flange 51a at the upper end of the sleeve 51 is formed.
7, the sleeve 51 is pressed down, and a gap is opened between the flange 51 a and the lower end of the guide member 6 facing the piston ring groove G. At the same time, the spacer ring S As shown in b), the guide member 6 is pushed out from the lower end of the guide member 6 by the regulating member 43 and is assembled into the piston ring groove G. Note that the sleeve 51 is
When the upper surface of “a” is at the same level as the lower groove surface of the piston ring groove G, the lower surface of the flange 51 a contacts the upper end of the jig 50, and further lowering is prevented. Next, the sleeve operating plate 45 is retreated to the outer escape position, the pressing member 42 is further lowered, and the regulating member 43 is moved to the flange 51a.
Press down to the lower end position where it comes into contact with. At this lower end position, if the thickness of the regulating member 43 is set so that the vertical distance C between the regulating member 43 and the lower end of the guide member 6 is t <C <t + t / 2, the abutment 42a Is set to 2t <B <2t + t / 2 as described above, the lower end of the guide member 6 and the contact surface of the lower end of the pressing member 42 with the upper side rail ring R are in contact with each other. The vertical distance therebetween is substantially equal to the plate thickness t of the side rail ring R, and only the lower side rail ring R is pushed out from the lower end of the guide member 6. Then, as shown in FIG. 7C, the side rail ring R passes through a gap between the regulating member 43 and the lower end of the guide member 6 and is assembled to the upper groove GU of the spacer ring S.

Next, the regulating member 43 is retracted outward while the pressing member 42 is pressed downward. According to this, the regulating member 43 has a step surface 51 formed on the outer peripheral portion of the flange 51a.
7C, the pressing member 42 slightly descends, and the upper side rail ring R is pushed out from the lower end of the guide member 6 as shown in FIG. Here, the upper side rail ring R is used when the regulating member 43 retreats.
8 (a) and 8 (b)
As shown in (c), a wavy portion that curves and protrudes below the guide member 6 forms a groove GL on the lower side of the spacer ring S.
And comes into contact with the flange 51a. Therefore, when the pressing member 42 is slightly lowered as described above and the abutment portion of the side rail ring R is pushed out from the guide member 6, the contraction force of the ring S and the restoring force to the horizontal position start from the wavy portion. The other portion of the ring S is moved into the groove GL, and the side rail ring R is assembled to the groove GL. Then, when the regulating member 43 comes off the abutment 42a, the pressing member 42 descends as shown in FIG. 7E, and the assembly is completed. Incidentally, since the piston P has a tapered lower edge of the piston ring groove G, even if the flange 51a is lowered to a level lower than the lower groove surface of the ring groove G, the side rail ring R is kept in the groove GL. It can be assembled, and the flange 51a does not need to be exactly at the same level as the groove surface.

When the side rail ring R is assembled into the groove GU on the upper side of the spacer ring S , both ends of the spacer ring S facing each other at the joint S2 of the spacer ring S are slid by the contraction of the side rail ring R. May be drawn together and overlap. Therefore, in the above embodiment, the side rail ring R is assembled to the groove GU (FIG. 7C).
Space the distance D from the piston center of the inner end surface of the regulating member 43 in a state opposite to the split end of the spacer ring S
Saringu both end portions of the S is set smaller than the outer diameter D'of abutment portion when overlapped as virtual shown in FIG. 7 (c), the blocking by the regulating member 43 overlapping the ends of the spacer ring S I did it. In addition, both ends may overlap when assembling the spacer ring S,
As shown in FIG. 9, if an engaging piece 43 d that engages with the abutment S <b> 2 of the spacer ring S protrudes from the lower surface of the regulating member 43,
The spacer ring S is extruded from the guide member 6 in a state where both end portions of the spacer ring S abut against both side surfaces of the engagement piece 43d, and in combination with the setting of D <D 'as described above, the spacer ring S
The spacer ring S can be assembled to the piston ring groove G without causing any overlap between the two end portions . In this case, the groove 51 for receiving the engagement piece 43d is formed in the flange 51a.
forming d.

The embodiment in which the piston P is conveyed to the assembly line with the guide member 6 set has been described above. In this embodiment, the guide member is attached to the piston P at the start end and the end of the assembly line. It is necessary to manually attach and detach the guide member 6 and return the guide member 6 removed at the end side to the start end side, which complicates the work, and requires a large number of guide members 6, which increases the equipment cost.

Therefore, in the embodiment shown in FIG. 10, the supply station 1 for the spacer ring, the supply station 2 for the side rail ring, the ring separating station 3 and the ring assembling station 4 are arranged annularly, and the guide member 6 is provided.
The jig 7 for supporting the table is index-rotated around the axis 80 at the center of the circle where these stations are arranged.
And the set jigs 7 are circulated to these stations 1 to 4 by the rotation of the support frame 8, and at each of the supply stations 1 and 2, the spacer ring is attached to the guide member 6 by the same supply device as in the above embodiment. S and the two side rail rings R are mounted, and then the spacing between the spacer ring S and the side rail ring R is made at the ring separation station 3 by the same separating device as in the above embodiment, and the guide is made at the ring assembly station 4. The member 6 is set on the piston P, all steps including the setting step of the guide member 6 are automated, and the assembling operation can be performed efficiently with as few guide members 6 as possible.

As shown in FIG. 11, a plurality of rods 70 inserted into a plurality of sleeves 81 suspended from the support frame 8 are implanted in the set jig 7. The rod 70 was urged upward by a spring 71 extrapolated to the rod 70 to be suspended and supported. An annular jig main body 72 that can be externally inserted into the piston P is fixedly provided at the center of the set jig 7, and a stepped portion that receives the lower end of the guide member 6 is provided at the upper inner periphery of the jig main body 72. And the jig body 7
On the upper surface of 2, an inner peripheral receiving surface 72a and an outer peripheral stepped surface 72b slightly lower than the receiving surface 72a were formed. Further, a stopper 54 for regulating the lowering position of the set jig 7 instead of the jig 50 of the above embodiment is provided on the pallet 5 on which the piston P is placed.
And a positioning pin 55 are implanted. The pin 55 is fitted into a positioning hole 73 provided in the jig main body 72 to align the piston P with the jig main body 72. The tool main body 72 was surely extrapolated to the piston P. As shown in FIG. 12, the assembling station 4 includes a pressing member 42 and a pair of regulating members 43, 4 similar to those in the above embodiment.
And a guide member 6 on the set jig 7.
The pressing member 42 is lowered in a state where the regulating member 43 is abutted against the peripheral surface portion between the spacer ring S and the side rail ring R by the operation of the cylinder 44a, and the lower end of the contact 4
When the regulating member 43 is depressed through the 2a, the lower operation plate 45 of the regulating member 43 is moved to the stepped surface 72b of the jig main body 72.
, And the set jig 7 is pressed down against the spring 71. In this embodiment, a cylinder 45a for the operation plate 45 is provided on the regulating member 43.

When the set jig 7 is pushed down as described above, the jig body 72 is extrapolated to the piston P and the jig body 7
2 is set on the piston P, and when the setting jig 7 is further depressed, the piston is moved between the receiving surface 72a of the jig main body 72 and the lower end of the guide member 6 as shown in FIG. A gap facing the ring groove G is opened, and at the same time, the spacer ring S is pushed out of the guide member 6 by the regulating member 43 and is assembled to the ring groove G. Here, the receiving surface 72a
When the set jig 7 is pushed down to a position at which the level becomes the same as the lower groove surface of the piston ring groove G, further lowering is prevented by the stopper 54, and thereafter the cylinder 45a is operated in the same manner as in the above embodiment. The operation plate 45 is connected to the stepped surface 72b.
And push down the regulating member 43 to a position where the regulating member 43 is seated on the receiving surface 72a, push out the lower side rail ring R from the guide member 6 and assemble the lower side rail ring R into the upper groove of the spacer ring S. 43 is retreated to the stepped surface 72b side, and the upper side rail ring R is pushed out from the guide member 6 and assembled into the lower groove portion of the spacer ring S. After the assembly of the ring, the regulating member 43 is retracted to the outside of the jig main body 72 and the pressing member 42 is raised. According to this, the set jig 7 is moved upward by the spring 71 and the guide member 6 The lower end is engaged with a stepped portion on the upper inner periphery of the jig body 72, and the guide member 6 is lifted and separated from the piston P. In this state, the assembled piston P is dispensed from the assembling station 4 and the next piston is inserted into the station 4. At the same time, the support frame 8 is rotated and the next set jig is moved from the separating station 3 to the assembling station 4. Move 7
Assemble the ring to the next piston in the same procedure as above.

In this embodiment, the engaging piece 43d, which engages with the abutment of the spacer ring S, is slidably inserted into a pocket 43f provided on the lower surface of the regulating member 43 on one side and externally inserted into a guide pin 43g. Spring 43h to provide inwardly biased,
When the spacer ring S is pushed out, the engagement piece 43d projects inward from the lower end of the guide member 6, and the abutment of the spacer ring S is guided by the engagement piece 43d over a position as close to the piston ring groove G as possible. The overlapping of the abutment portions when the spacer ring S is assembled is reliably prevented. still,
An escape groove 72c for receiving the pocket portion 43 is formed on the upper surface of the jig body 72.

[0021]

As is apparent from the above description, according to the first and fourth aspects of the present invention, the spacer ring and the pair of side rail rings are formed by a single assembling device using a single guide member. Can be assembled in the piston ring groove, and there is no need to provide an individual guide member or an assembling device for each ring, which has the effect of reducing the line length and the equipment cost. According to the second and fifth aspects of the present invention, after the spacer ring is pushed out of the guide member by the regulating member,
The side rail ring can be assembled immediately by directly disposing the restricting member to face the guide member, thereby improving work efficiency. Further, according to the invention of claim 6, the restricting member is formed by the pressing member for the side rail ring. Can be pushed in the axial direction, and a pushing drive source for the regulating member is not required, thereby simplifying the device structure. According to the ninth aspect of the present invention, before the assembly of the spacer ring, The assembling of the lower side rail ring can be performed smoothly without the simultaneous extrusion of the rear side rail ring. According to the third, seventh and eighth aspects of the present invention, it is possible to prevent the opposite ends of the spacer ring from overlapping at the abutment portion of the spacer ring , and further according to the tenth aspect of the present invention. Occurrence of rail ring assembly error can be prevented, and the reliability of assembling the spacer ring and the side rail ring is improved. According to the eleventh aspect of the present invention, all steps including the step of setting the guide member can be automated, and the assembling work can be efficiently performed with as few guide members as possible, thereby improving productivity. According to the twelfth aspect of the present invention, a dedicated driving source for inserting and removing the set jig from and into the piston is not required, and the equipment cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an example of an assembling line equipped with the apparatus of the present invention.

FIG. 2 is a cutaway front view showing a setting state of a piston and a guide member on a transport pallet.

FIG. 3 is a cross-sectional view of a main part of the ring separation station taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view of the ring assembling station cut along the line IV-IV in FIG.

FIG. 5 is a plan view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 4;

FIG. 7 is a process diagram showing an assembling work procedure in an assembling station.

8A and 8B are views showing a state of a side rail ring immediately before being pushed out from a guide member, wherein FIG. 8A is a perspective view, FIG. 8B is a front view, and FIG.

FIG. 9 is a cross-sectional view of a modification of the regulating member.

FIG. 10 is a plan view of another embodiment of the present invention.

11 is a sectional view taken along line XI-XI of FIG.

12 is a view cut along the line XII-XII in FIG.
(A) is a diagram showing a state before the set jig is pushed down, (b)
Shows the state when the set jig is pushed down

FIG. 13A is an exploded perspective view of an assembled oil ring,
(B) is a partially enlarged perspective view of the spacer ring, and (c) is a sectional view showing an assembled state of the assembled oil ring.

[Explanation of symbols]

P Piston G Piston ring groove S Spacer ring R Side rail ring 4 Assembly station 42 Pressing member 42a Standing 43 Control member 5 Pallet 50 Jig 51 Sleeve 51a Flange (second control member) 6 Guide member 7 Set jig 8 Support frame

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Takahashi 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Inside Honda Engineering Co., Ltd. (72) Inventor Naofumi Nagata 1-10-1 Shinsayama, Sayama City, Saitama Prefecture (56) References JP-A-54-34186 (JP, A) JP-A-62-9837 (JP, A) JP-A-55-75433 (JP, U) (58) Int.Cl. ⁶ , DB name) B23P 19/02 B23P 21/00 303

Claims (12)

(57) [Claims] 1. A method of assembling an oil ring comprising a spacer ring and a pair of side rail rings superposed on both sides of the ring into a piston ring groove of a piston, wherein a guide having a diameter larger than an outer diameter of the piston is provided. Positioning the member with respect to the piston such that the tip of the guide member is substantially at the same level as the groove surface on one side of the piston ring groove ; Mounting the pair of side rail rings so that the spacer ring is positioned at the forefront and the pair of side rail rings is positioned rearward toward the distal end of the guide member; and extruding the spacer ring from the distal end of the guide member After the step of assembling the piston ring groove, and after the spacer ring has been assembled, the groove surface on one side of the piston ring groove is The regulating member is disposed facing the groove with a gap facing the groove formed between the saling and the front side rail ring is pushed out from the tip of the guide member in this state, and the side rail ring is passed through the gap. A step of assembling into the groove, and a groove formed between the spacer ring and the other surface of the piston ring groove by pushing out the rear side rail ring from the tip of the guide member in a state where the regulating member is withdrawn. Assembling the oil ring to the piston. 2. A clearance is provided between the spacer ring mounted on the guide member and the front side rail ring, the regulating member is interposed at the clearance, and the regulating member is moved toward the front of the guide member. 2. The method according to claim 1, wherein the spacer ring is pushed out from the tip of the guide member. 3. The set oil for a piston according to claim 1, wherein the spacer member is regulated by the regulating member such that both ends of the spacer ring facing each other at the abutting portion of the spacer ring do not overlap. How to assemble the ring. 4. A device for assembling an oil ring comprising a spacer ring and a pair of side rail rings superimposed on both side surfaces of the ring into a piston ring groove of the piston, wherein the oil ring has a diameter larger than the outer diameter of the piston. , the tip of the piston ring groove
It can be positioned and set with respect to the piston so that it is substantially at the same level as the groove surface on one side , and a spacer ring and a pair of side rail rings are provided on the outer periphery toward the front end with the spacer ring at the frontmost position and one at the rear position. a guide member which can be mounted as a pair of side rail ring is positioned, and extruding the extrusion means in the order the spacer ring and a pair of side rails ring from the distal end of the guide member, to each other different radius direction of the guide member It can move forward and backward, and can face the tip of the guide member with a gap facing the groove formed between the one side groove surface of the piston ring groove and the spacer ring attached to the piston ring groove. Multiple
And a restricting member for mounting the oil ring on the piston. 5. The restriction member is movable in the axial direction of the guide member, and is restricted to a distance between a spacer ring mounted on the guide member and a front side rail ring of the pair of side rail rings. The member can be inserted,
5. The set oil for a piston according to claim 4, wherein said pushing means is constituted by a pressing member abutting on a rear side rail ring and movable in an axial direction of a guide member, and said regulating member. Ring assembly device. 6. The pressing member is provided so as to be biased toward the axial direction of the guide member, and one end of the restricting member and the tip of the pressing member is provided with a contact which abuts on the other. 6. The apparatus according to claim 5, wherein the regulating member is pushed forward in the axial direction of the guide member. 7. A regulating member of the regulating member ,
In a state in which the gap is opposed to the tip of the guide member, the inner end surface of the guide member facing inward in the radial direction faces the abutment portion of the spacer ring assembled to the piston ring groove, and The distance between the inner end face and the center of the piston is equal at both ends of the spacer ring facing each other at the abutment portion.
7. The structure according to claim 4, wherein the outer diameter of the abutment portion in a state where the portions are overlapped is smaller than the outer diameter.
A device for assembling a combined oil ring to a piston according to any one of claims 1 to 3. 8. An engagement piece which engages with a gap at an abutting portion of a spacer ring mounted on the guide member is provided on a surface of the guide member of the regulation member which faces forward in the axial direction. 8. A device for assembling an oil ring to a piston according to claim 7. 9. An axial distance between the tip of the guide member and the groove surface of the one side of the piston ring groove is A, a projecting length of the abutment is B, and a plate thickness of the side rail ring is t. 7. The apparatus according to claim 6, wherein 0 ≦ A <t / 2 and 2t <B <2t + t / 2. 10. A second regulating member for receiving a rear side rail ring pushed out from a guide member at a position substantially at the same level as a groove surface on the other side of the piston ring groove. Item 10. A device for assembling an assembled oil ring to a piston according to any one of Items 4 to 9. 11. A set jig which supports the guide member and sets the guide member on a piston, the jig being detachable from the piston is provided, and the set jig is provided with a spacer ring supply station and a side rail ring. 11. The assembly oil ring for a piston according to any one of claims 4 to 10, wherein the oil ring is circulated through a supply station and an assembly station in which the pushing means and the regulating member are arranged. Assembly device. 12. A support frame circulating between a supply station for a spacer ring, a supply station for a side rail ring, and an assembling station biases the set jig in a direction away from a piston to support the set jig. 12. The apparatus according to claim 11, wherein the guide member is set on the piston by pushing the setting jig toward the piston by means.