JPH0451946Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seal ring assembly device for fitting a seal ring into a circumferential groove formed on the outer periphery of a work such as a piston in a damper.

[Conventional technology]

As a conventional seal ring assembly device, for example, as disclosed in Japanese Utility Model Application Publication No. 11868/1983,
A device for assembling a piston ring as a seal ring to a piston of an engine, which is a workpiece, is known.

This device includes a guide jig having a constriction formed in the width of the abutment of the piston ring and a tapered portion provided below the constriction, and a push-down means for pushing down the piston ring.

When assembling the piston ring to the piston, the piston ring is first inserted into the guide jig through the constriction. Next, the inserted piston ring is pushed down by the push-down means, expanded in diameter along the tapered part of the guide jig, and fitted into a circumferential groove formed on the outer periphery of the piston.

[Problem that the invention attempts to solve]

In the conventional seal ring assembling device described above, the pushing means pushes down the seal ring while keeping it horizontal, so that both ends of the seal ring bordering on the abutment try to fit into the circumferential groove of the workpiece at the same time.

However, when the abutment in the seal ring is formed obliquely, the ends of the seal ring may interfere with each other depending on the timing of fitting into the circumferential groove, and may not fit into the circumferential groove.

Furthermore, when the seal ring is made of a resin such as Teflon, the reaction force to expand the diameter when the seal ring is expanded is small, so the force that tends to fit the seal ring into the circumferential groove is weak. Therefore, there is a problem in that the seal ring cannot be reliably fitted over the entire circumference of the circumferential groove, and a portion of the seal ring tends to protrude from the circumferential groove of the workpiece.

In particular, in recent years, as assembly lines have become more automated, the process after the seal ring is assembled is also unmanned and manual inspection is not performed. In such a case, if a part of the seal ring protrudes from the circumferential groove of the workpiece as described above, there is a risk of damaging the seal ring, the workpiece, and even the equipment that constitutes the assembly line in the next process. For this reason, it is necessary to fit the seal ring more reliably into the circumferential groove of the workpiece.

[Means for solving problems]

In order to solve the above problems, the seal ring assembly device according to the present invention fits a seal ring that has an abutment and is expandable in diameter into a circumferential groove formed in a workpiece having a circular outer circumferential shape. In the seal ring assembly device, at least a small diameter end portion having an outer diameter smaller than the inner diameter of the seal ring when the diameter is contracted, and a large diameter end portion having an outer diameter larger than at least the outer diameter of the seal ring insertion side end of the workpiece. a tapered guide jig that is attached to the end of the workpiece; and a diameter expanding means that pushes the seal ring in the axial direction of the workpiece and expands the diameter by following the tapered surface of the guide jig; a fitting means for pushing one end of the expanded seal ring to fit it into the circumferential groove of the workpiece;
It is characterized by comprising a rotation means for rotating the fitting means around the axis of the workpiece.

[Effect]

With the above configuration, when fitting the seal ring into the circumferential groove of the workpiece, the seal ring is first placed on the small diameter end side of the guide jig, and expanded while being pushed toward the large diameter end side by the diameter expanding means. It is moved to the vicinity of the circumferential groove formed in the workpiece. Next, only one end of the seal ring is pushed toward the circumferential groove side of the workpiece by the fitting means, and is fitted into the workpiece.

At this time, the other end of the seal ring is stopped near the circumferential groove, so the end pushed by the fitting means is securely inserted into the circumferential groove without interfering with the other end. do.

Therefore, when the fitting means is rotated by the rotating means, the seal ring is gradually pushed toward the circumferential groove side of the workpiece by the fitting means from near the end fitted into the circumferential groove of the workpiece. . Therefore, the seal ring is fitted into the circumferential groove of the work piece little by little, and when the fitting means makes one revolution, the seal ring is reliably fitted over the entire circumference of the circumferential groove.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in FIG. 1, the piston 11, which is a workpiece, has a circular outer periphery, and circumferential grooves 11a and 11b are formed on the outer periphery. The seal ring 12 fitted into the circumferential groove 11a is made of Teflon resin and has an annular shape as shown in FIG. 4, with an abutment 12a formed diagonally so that the diameter can be expanded.

The guide jig 13 that guides the piston 11 is
The small diameter end is set to an outer diameter smaller than the inner diameter of the seal ring 12 when the diameter is contracted, while the large diameter end is set to a larger outer diameter than the outer diameter of the piston 11 at the insertion end of the seal ring 12. It has a tapered shape. Further, a recess 13a that fits into the top of the piston 11 is formed on the large diameter end side of the guide jig 13, and a through hole 12b is provided in the center.

On the other hand, a diameter expanding means 15 that pushes the seal ring 12 in the axial direction of the piston 11 and expands the diameter along the tapered surface of the guide jig 13 includes a guide rod 14, which is attached to the guide jig 13. By being inserted into the through hole 13b, the axial center of the diameter expanding means 15 and the axial center of the piston 11 are aligned.

The housing 16 to which the guide rod 14 is attached has a substantially cylindrical shape with its upper end closed, and a flange-shaped portion 16a is formed at its lower end. As shown in FIG. 2, a circumferential groove 16b is formed on the inner circumference of the flange-shaped portion 16a.

In the circumferential groove 16b, there are three seal ring pushing members 17 that have a partially annular shape and push the seal ring 12 downward as the housing 16 moves up and down.
... are fitted in the housing 16 so as to be slidable in the radial direction. Seal ring pushing member 17
... are the springs 1 provided between the circumferential wall of the circumferential groove 16b in the housing 16, respectively.
8... in the direction of the central axis of the housing 16.

In addition, stopper pins 19 that are inserted into through holes 16c formed in the peripheral wall of the circumferential groove 16b in the housing 16 are attached to the seal ring pushing members 17, respectively, and the seal ring pushing members 17... , the position of the housing 16 in the center direction is regulated.

The housing 16 further includes an air cylinder 20 in which the tip of the piston rod 20a is located inside the circumferential groove 16b in the housing 16 and operates parallel to the axis of the piston 11, which is the workpiece.
is provided. The piston rod 20a has
Press one end of the seal ring 12 to release the piston 11.
A fitting means 21 for fitting into the circumferential groove 11a is attached.

On the other hand, the diameter expanding means 15 is attached to the lower surface of the rotating part 22a of the rotating means 22, and
It is designed to rotate around the axis of 1. Further, it is attached to a handling robot (not shown) or the like to the rotating means 22, so that it can be moved up and down together with the diameter expanding means 15.

In the above configuration, first, the guide jig 13 is placed on the piston 11 so that the top of the piston 11 and the recess 13a of the guide jig 13 fit together.
The seal ring 12 is disposed on the small diameter end side of the guide jig 13 so that the end 12b of the seal ring 12 is directly below the fitting means 21 of the diameter expanding means 15.

Next, when the diameter expanding means 15 is lowered together with the rotating means 22, the guide rod 14 of the diameter expanding means 15 is lowered.
is fitted into the through hole 13b provided in the guide jig 13. Then, the diameter expanding means 15 descends so that the axis of the diameter expanding means 15 and the axis of the piston 11 coincide.

On the other hand, the seal ring pushing members 17... are urged in the direction of the central axis of the diameter expanding means 15 by springs 18.... Therefore, the seal ring pushing member 17 always comes into contact with the tapered surface of the guide jig 13, and as the diameter expanding means 15 descends, it resists the urging force of the spring 18 as shown in FIG. At the same time, it spreads outward following the tapered surface of the guide jig 13.

The seal ring 12 is pushed by the seal ring pushing member 17 and moves downward,
Similarly to the seal ring pushing member 17, the diameter is expanded following the tapered surface of the guide jig 13. Diameter expansion means 1
5, the seal ring 12 is stopped when it reaches the vicinity of the circumferential groove 11a formed in the piston 11.

Therefore, when the air cylinder 20 is driven forward, the end 12b of the seal ring 12 is inserted into the fitting means 2.
1, and is fitted into the circumferential groove 11a of the piston 11 due to the diameter expansion reaction force stored in the seal ring 12. At this time, the seal ring 12
Since only the end portion 12b is pushed down by the fitting means 21, there is no interference between the end portions 12b and 12c, and the end portion 12b is reliably fitted into the circumferential groove 11a. .

Next, the fitting means 21 is rotated by the rotating means 22 together with the diameter expanding means 15 in a counterclockwise direction when viewed from above. Then, the seal ring 12
2b, the piston 11 is gradually pushed downward while sliding into contact with the fitting means 21, and is fitted into the circumferential groove 11a of the piston 11 little by little.

When the diameter expanding means 15 and the fitting means 21 rotate once, the seal ring 12 is fitted over the entire circumference of the circumferential groove 11a. In particular, the end 1 of the sealing ring 12
2c is inserted last, so it does not interfere with other parts of the seal ring 12 or protrude from the circumferential groove 11a.

In this embodiment, the lower surfaces of the seal ring pushing members 17 are kept horizontal to push down the seal ring 12, and then the end portion 12b is pushed down by the fitting means 21.
However, the insertion means 21 may be set in advance at a position lower than the lower surface of the seal ring pushing member 17, or the lower surface of the seal ring pushing member 17 may be set in a spiral shape. may be formed.

Further, although the piston is used as a workpiece for assembling a seal ring, the present invention is not limited to this, and any workpiece that can be used to assemble a seal in a groove can be used.

In addition, the effects of the present invention are particularly noticeable when the abutment of the seal ring is oblique or when the material is made of resin such as Teflon, but the present invention is not limited to this, for example, when the seal ring is used as a piston ring for an engine, etc. The same effect can be obtained even if the abutment is in the axial direction or if the material is a metal with high elasticity.

[Effect of idea]

As described above, the seal ring assembly device according to the present invention is capable of assembling a seal ring in which a seal ring having an abutment and capable of expanding its diameter is fitted into a circumferential groove formed in a workpiece having a circular outer circumferential shape. In the device,
It has at least a small-diameter end portion with an outer diameter smaller than the inner diameter of the seal ring when the diameter is contracted, and a large-diameter end portion with an outer diameter larger than at least the outer diameter of the seal ring insertion side end of the workpiece. a tapered guide jig attached to the end; a diameter expanding means for pushing the seal ring in the axial direction of the workpiece and enlarging the diameter by following the tapered surface of the guide jig; and one end of the seal ring whose diameter has been expanded. This configuration includes a fitting means for pushing and fitting into the circumferential groove of the workpiece, and a rotating means for rotating the fitting means around the axis of the workpiece.

With this, when fitting the seal ring into the circumferential groove of the workpiece, first place the seal ring on the small diameter end side of the guide jig, push it toward the large diameter end side with the diameter expanding means, and then form the seal ring on the workpiece. While moving it near the circumferential groove, the diameter is expanded. Therefore, if only one end of the seal ring is pushed into the circumferential groove side of the workpiece by the fitting means, the other end of the seal ring remains near the circumferential groove, so there is no interference with the other end. It is possible to reliably fit only the end pushed by the fitting means into the circumferential groove without causing a problem.

Further, when the fitting means is rotated by the rotating means, the seal ring is gradually pushed toward the circumferential groove side of the workpiece by the fitting means from near the end fitted into the circumferential groove of the workpiece. . Therefore, the seal ring is fitted into the circumferential groove of the work piece little by little, and when the fitting means makes one revolution, the seal ring is reliably fitted over the entire circumference of the circumferential groove.

Therefore, even if the abutment in the seal ring is formed obliquely, the two ends of the seal ring will not interfere with each other depending on the timing when they fit into the circumferential groove. It can be inserted into.

In addition, the seal ring is made of resin such as Teflon, and the reaction force when expanding the diameter is small, so even when the force trying to fit it into the circumferential groove is weak, the seal ring will gradually move around the workpiece. Since it fits into the circumferential groove, it also has the effect of being able to fit securely.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional front view showing the configuration of a seal ring assembly device, and FIG. 3 is a vertical sectional front view showing a state when the seal ring is pushed in the axial direction of the workpiece, and FIG. 4 is a perspective view showing an example of the shape of the seal ring. 11 is a piston (work), 11b is a circumferential groove,
12 is a seal ring, 12a is an abutment, 13 is a guide jig, 15 is a diameter expanding means, 21 is a fitting means, and 22 is a rotating means.

Claims (1)

[Claims for Utility Model Registration] A seal ring assembly device for fitting a seal ring having an abutment and expandable diameter into a circumferential groove formed in a workpiece having a circular outer circumferential shape; It has a small diameter end with an outer diameter smaller than the inner diameter when the diameter is reduced, and a large diameter end with an outer diameter larger than at least the outer diameter of the seal ring insertion side end of the workpiece, and is attached to the end of the workpiece. A tapered guide jig, a diameter expanding means that pushes the seal ring in the axial direction of the workpiece and expands the diameter by following the tapered surface of the guide jig, and a diameter expanding means that presses one end of the expanded seal ring to expand the diameter of the workpiece. A seal ring assembling device comprising a fitting means for fitting into a circumferential groove and a rotation means for rotating the fitting means around the axis of a workpiece.