JP2015221466A - Seal ring assembling device and seal ring assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal ring assembling technique by which a fit failure is hard to occur.SOLUTION: As shown in fig. (a), a seal ring 70 is held on a cylindrical part 33. One end 71 of the seal ring 70 is provided with a first step 73 an inner diameter side of which further projects than an outer diameter side, and the other end 72 thereof is provided with a second step 74 an outer diameter side of which further projects than an inner diameter side. First, a first movable claw 51 contacts the one end 71 and starts to lower the one end 71. As shown in fig. (b), the one end 71 of the seal ring 70 fits into an annular groove 24. At this time, the other end 72 of the seal ring 70 is positioned above the annular groove 24, and is pushed and lowered by a final movable claw 53. As shown in fig. (c), the other end 72 of the seal ring 70 fits into the annular manner 24 in such a manner that the first step 73 overlaps the second step 74.

Description

  The present invention relates to a seal ring assembling technique for assembling a seal ring divided at a joint into an annular groove provided on the outer periphery of a workpiece.

  FIG. 8 is a diagram showing a main part of the CVT transmission. As shown in FIG. 8A, a fixed pulley 102 is integrally formed on the pulley shaft 101, and a movable pulley 103 is movable on the pulley shaft 101 so as to be movable in the axial direction. It is supported. The movable pulley 103 is housed in a cup 104 that is fixed to the pulley shaft 101. A space surrounded by the cup 104 and the movable pulley 103 is an oil chamber 105.

When the oil pressure in the oil chamber 105 is increased, the movable pulley 103 is urged so as to approach the fixed pulley 102. By this urging, the belt 106 is pushed in a direction in which the winding radius increases.
As a result, as shown in FIG. 8B, the movable pulley 103 is sufficiently close to the fixed pulley 102, and the winding radius of the belt 106 is increased. When the hydraulic pressure is lowered, the process returns to FIG.

A seal ring 107 is fitted on the outer periphery of the movable pulley 103 so that the oil in the oil chamber 105 does not leak to the outside, and the outer peripheral surface of the seal ring 107 is in contact with the cup 104.
Conventionally, the seal ring 107 has been manually fitted into the annular groove.
In recent years, automatization work has been required due to demands for improvement in work efficiency and labor saving, and various apparatuses have been proposed for that purpose (see, for example, Patent Document 1 (FIG. 1)).

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a view for explaining the basic configuration of a conventional seal ring assembling apparatus. A cam-shaped guide 113 is placed on a work 112 having an annular groove 111, and a stocker 114 is placed on the cam-shaped guide 113. The stocker 114 holds a plurality of seal rings 107 at a predetermined pitch.

  The lowermost seal ring 107 is dropped onto the cam-shaped guide 113 by one take-out arm 116. Next, the ring pushing members 117 and 117 push down the upper surface of the seal ring 107 in the cam-shaped guide 113. The seal ring 107 is lowered while being guided by the cam-shaped guide 113. Finally, the seal ring 107 is guided and fitted into the annular groove 111.

By the way, the seal ring 107 is made of a soft material having a poor self-restoring property, and as shown in FIG. 10A, the seal ring 107 has a first step 118 having an inner diameter side protruding from the outer diameter side at one end portion. The other end portion has a second step 119 in which the outer diameter side protrudes from the inner diameter side.
As shown in FIG. 10B, when the second step 119 is fitted to the first step 118, the fitting is good.

Incidentally, although rarely, as shown in FIG. 10C, the inner surface of the first step 118 may hit the outer surface of the second step 119. In this case, the fitting is bad.
In addition, as shown in FIG. 10D, the tip surface of the second step 119 may hit the tip surface of the first step 118. This also results in poor fitting.

In the case of poor fitting, it is necessary to correct the fitting manually. However, since the seal ring 107 is a material that is difficult to return to its original shape, the correction work is not easy.
That is, in the conventional apparatus, since there is a probability that there is a fitting failure, a process for determining whether or not the fitting is good and a correction process for correcting the defect are indispensable.
If these steps are added to the fitting operation step, productivity is lowered and equipment cost is increased.

  Therefore, in order to promote automation, there is a need for a seal ring assembling technique that does not cause poor fitting or that occurs very little even if it occurs.

JP 2013-144333 A

  It is an object of the present invention to provide a seal ring assembling technique that hardly causes poor fitting.

The invention according to claim 1 is a seal ring assembling apparatus for assembling a seal ring divided at a joint in an annular groove provided on an outer periphery of a workpiece.
The seal ring has, at one end, a first step where the inner diameter side protrudes from the outer diameter side, and a second step, the outer diameter side protrudes from the inner diameter side at the other end.
The seal ring assembling apparatus is
A workpiece support member for supporting the workpiece;
A seal ring holding member that has a cylindrical portion having the same outer diameter as the outer periphery, holds the seal ring before assembly in the cylindrical portion, and is in contact with the workpiece supported by the workpiece support member;
A moving claw that comes into contact with the seal ring held by the seal ring holding member;
A claw moving mechanism for moving the moving claw from the seal ring holding member to the workpiece;
A stopper for ending the movement of the moving claw at a position where the seal ring fits in the annular groove,
The moving claw is composed of a plurality of claws arranged so as to surround the annular groove and starting with the first moving claw and ending with the final moving claw, and the first moving claw first contacts one end of the seal ring. The plurality of claws move so that the one end portion starts moving and the last moving claw finally comes into contact with the other end portion of the seal ring and starts moving the other end portion. They are arranged with a relative difference in direction.

  The invention according to claim 2 further includes a holding claw that moves in a direction orthogonal to the moving direction and presses the seal ring into the annular groove.

  The invention according to claim 3 is characterized in that the holding pawl is provided in the vicinity of each of the moving claws.

  The invention according to claim 4 is characterized in that the seal ring holding member also serves as a conveying member that conveys the seal ring to the vicinity of the workpiece while holding one seal ring.

In the invention according to claim 5, the seal ring has a first step in which the inner diameter side projects from the outer diameter side at one end, and the second step in which the outer diameter side projects from the inner diameter side at the other end. A seal ring assembling method for assembling the seal ring in an annular groove provided on the outer periphery of the workpiece,
A seal ring holding member having a cylindrical portion having the same outer diameter as the outer periphery, a moving claw comprising a plurality of claws arranged so as to surround the annular groove and starting from the first moving claw and ending with the final moving claw, and the movement Preparing a claw moving mechanism for moving the claw, and a stopper for terminating the movement of the moving claw at a position where the seal ring fits in the annular groove;
A work setting process for setting a work on a work support member;
A seal ring holding step of holding the seal ring on the seal ring holding member;
An abutting step of abutting the seal ring holding member against the workpiece such that the cylindrical portion is continuous with the outer periphery of the workpiece;
One end fitting step of the seal ring that moves one end of the seal ring with the first moving claw and fits into the annular groove;
After this, the other end of the seal ring is moved by the final moving claw, and the other end fitting process of the seal ring to be fitted in the annular groove,
The second step is superimposed on the first step fitted in the annular groove later.

  The invention according to claim 6 is characterized in that the seal ring is made of a soft material having poor self-restoring property.

In the invention according to claim 1, the plurality of moving claws are arranged while ensuring a relative difference in the moving direction. First, the first moving claw comes into contact with one end of the seal ring and starts to move one end. Finally, the final moving claw comes into contact with the other end of the seal ring and starts moving the other end.
One end of the seal ring is fitted into the annular groove, and finally the other end of the seal ring is fitted.
The second step can be overlapped with the first step fitted in the annular groove from the outside, and the fitting failure described in FIGS. 10C and 10D does not occur or hardly occurs.

  That is, according to the present invention, a seal ring assembling apparatus that is unlikely to cause poor fitting is provided, and productivity can be improved. In addition, since it is not necessary to determine whether the fitting is good or not and to perform a correction process, the equipment cost can be reduced.

  The invention according to claim 2 further includes a holding claw that moves in a direction orthogonal to the moving direction and presses the seal ring into the annular groove. By pressing with the holding pawl, the seal ring can be securely fitted into the annular groove.

In the invention which concerns on Claim 3, the holding nail | claw is provided in the vicinity of each moving claw. The holding claws can be arranged at a position away from the moving claws, but a member for supporting the holding claws is separately required.
By disposing the holding claw in the vicinity of the moving claw, the holding claw and the moving claw can be supported by a common member, and the structure of the seal ring assembling apparatus can be simplified.

  In the invention which concerns on Claim 4, the seal ring holding member serves as the conveyance member which conveys this seal ring to the vicinity of a workpiece | work in the state which hold | maintained one seal ring. As described with reference to FIG. 9, in the conventional apparatus, the cam-shaped guide and the stocker are indispensable. In the present invention, the cam-shaped guide and stocker are integrated into one part (seal ring holding member). Therefore, the structure of the seal ring assembling apparatus can be more easily and miniaturized.

  The invention according to claim 5 includes the step of moving one end portion of the seal ring with the first moving claw and fitting it into the annular groove, and thereafter moving the other end portion of the seal ring with the final moving claw into the annular groove. And a second step is superimposed on the first step fitted in the annular groove.

  That is, according to the present invention, a seal ring assembling method that is unlikely to cause poor fitting as in the first aspect is provided, and productivity can be improved. In addition, since it is not necessary to determine whether the fitting is good or not and to perform a correction process, the equipment cost can be reduced.

  In the invention which concerns on Claim 6, a seal ring consists of a soft material with few self-restoration properties. According to the present invention, since a correction process is unnecessary, it is suitable for a seal ring made of a soft material that is difficult to return to its original shape.

1 is a basic configuration diagram of a seal ring assembling apparatus according to the present invention. FIG. 2 is an enlarged view of part 2 of FIG. 1. It is a figure explaining arrangement | positioning of a some moving nail | claw. It is a figure explaining the effect | action of a 1st movement nail | claw. It is a figure explaining the effect | action of the last movement nail | claw. It is a figure explaining the effect | action of a nail | claw. It is a figure explaining the movement form of a seal ring. It is a figure which shows the principal part of a CVT transmission. It is a basic block diagram of the conventional seal ring assembly apparatus. It is a perspective view explaining a 1st level | step difference and a 2nd level | step difference.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the seal ring assembly device 10 is provided on a base 11 and extends upward from the base 11, a cylindrical work support member 13 that supports the work 20, a bell-shaped seal ring holding member 30, and the like. A post 40 that is attached to the post 40, a slider 42 that is movably fitted to the rail 41, a lifting plate 43 that extends horizontally from the slider 42, A claw moving mechanism 44 passed between the elevating plate 43 and the post 40 and elevating the slider 42 along the rail 41, a center rod 45 attached to the elevating plate 43 so as to be movable up and down, and a lower end of the center rod 45 The taper pin 46 to be attached, the claw support rods 47 and 47 suspended from the elevating plate 43, and the L-shape attached to the lower part of these claw support rods 47 and 47 Tools 48, 49, first moving claw 51 and holding claw 52 attached to one L-shaped metal fitting 48, final moving claw 53 and holding claw 52 attached to the other L-shaped metal fitting 49, L-shaped metal fitting 48, 49, stoppers 54, 54 which are arranged to be positioned directly below 49 and are attached to the sub-base 14.

The workpiece 20 includes, for example, a pulley shaft 22 that is integrally provided with a fixed pulley 21 and a movable pulley 23 that is fitted to the pulley shaft 22, and includes an annular groove 24 on the outer periphery of the movable pulley 23.
Further, the seal ring holding member 30 includes an upper bottom portion 31, a tapered portion 32 whose outer diameter increases as it falls from the periphery of the upper bottom portion 31, and a cylindrical portion 33 that decreases from the tapered portion 32. Is the same as the outer diameter of the movable pulley 23. The upper bottom 31 includes a center pin 34 that fits in a center hole 25 provided at one end of the pulley shaft 22 on the lower surface and a center recess 35 on the upper surface.

The final moving claw 53 is arranged near the first moving claw 51 as shown in FIG. 3 to be described later, but is shown separately in FIG. 1 for easy understanding.
Further, the claw moving mechanism 44 is preferably an air cylinder, a hydraulic cylinder, or an electric cylinder, but may be a pinion rack or any type and form.

  The center rod 45 is accommodated in a center sleeve 55 fixed to the elevating plate 43. Due to the guiding action of the center sleeve 55, the center rod 45 moves up and down without shaking sideways. The upper end of the center rod 45 is hooked on the upper surface of the center sleeve 55 via a nut 56. Since the center spring 57 is disposed between the lower surface of the elevating plate 43 and the upper surface of the taper pin 46, the center rod 45 is always urged downward.

  The claw support rod 47 is housed in a side sleeve 58 fixed to the lifting plate 43. By the guiding action of the side sleeve 58, the claw support rod 47 moves up and down without shaking sideways. The upper end of the claw support rod 47 is hooked on the upper surface of the side sleeve 58 via a nut 59. Since the side spring 61 is disposed between the lower surface of the side sleeve 58 and the upper surface of the L-shaped metal fitting 48 (or 49), the claw support rod 47 is always urged downward.

  The height of the L-shaped brackets 48 and 49 can be adjusted by twisting the nut 59. The L-shaped metal fitting 49 that supports the final moving claw 53 is arranged above the L-shaped metal fitting 48 that supports the first moving claw 51 by a difference L. That is, the L-shaped bracket 48 and the L-shaped bracket 49 are arranged with a relative difference (height difference) L in the moving direction of the elevating plate 43.

  As shown in FIG. 2, an air cylinder 63 is attached horizontally to the vertical wall portion 62 of the L-shaped metal fitting 48, and an L-shaped holding claw 52 is attached to the piston rod 64 of the air cylinder 63. When the air cylinder 63 moves forward, the holding pawl 52 moves forward to a position indicated by an imaginary line.

  Further, a horizontal rod 65 is attached to the vertical wall portion 62 at a position above the piston rod 64, a first moving claw 51 having a crank section is attached to the tip of the horizontal rod 65, and the base portion of the horizontal rod 65 has a large diameter. Part 66 is designated. A compression spring 67 is disposed between the first moving claw 51 and the vertical wall portion 62, and the action of the compression spring 67 biases the first moving claw 51 forward.

  At this time, since the large-diameter portion 66 exerts a retaining action, there is no fear that the horizontal rod 65 comes off from the vertical wall portion 62. Further, when an external force (horizontal force) toward the vertical wall portion 62 is applied to the first moving claw 51, the compression spring 67 is contracted, and the large diameter portion 66 is retracted from the vertical wall portion 62 as indicated by an imaginary line. The moving claw 51 also moves backward together.

Three or more moving claws 51 and 53 having the above configuration are arranged.
FIG. 3 is an exploded view of the first moving claw 51, the second moving claw 51B, the third moving claw 51C, the fourth moving claw 51D, the fifth moving claw 51E, and the final moving claw 53 in this order. They are arranged at a 60 ° pitch. That is, the final moving claw 53 is arranged next to the first moving claw 51.

Since the structure of the member that supports the second to final moving claws 51B to 53 is the same as that shown in FIG. 2, the description of the support structure is omitted.
The number of the moving claws 51, 51B to 51E, 53 is six in this example, but can be arbitrarily set as long as it is three or more.

  The first moving claw 51 spirals from the first moving claw 51 to the final moving claw 53 so that the second moving claw 51B is slightly higher than the first moving claw 51 and the third moving claw 51C is slightly higher than the second moving claw 51B. It is arranged in steps. The relative difference (height difference) between the L-shaped bracket 48 that supports the first moving claw 51 and the L-shaped bracket 49 that supports the final moving claw 53 is set to L as described above.

Next, the operation of the seal ring assembling apparatus 10 having the above configuration will be described.
First, a seal ring assembling apparatus 10 as shown in FIG. 1 is prepared (preparation process).
Next, the workpiece 20 is set on the workpiece support member 13 using a conveying means such as a robot (work setting step).
On the other hand, one seal ring 70 is held by the seal ring holding member 30 in another place (seal ring holding step). The seal ring holding member 30 holding one seal ring 70 is guided onto the movable pulley 23 by using a conveying means such as a robot.

Then, as shown in FIG. 4, the cylindrical portion 33 is in contact with the outer periphery of the workpiece (movable pulley 23) so that the seal ring holding member 30 is placed on the movable pulley 23 (contact process).
At this time, since the center pin 34 fits into the center hole 25 of the pulley shaft 22, the center of the seal ring holding member 30 matches the center of the workpiece 20.

In this state, the elevating plate (FIG. 1, reference numeral 43) is lowered.
Then, in FIG. 4, the taper pin 46 fits into the center recess 35 and the center spring 57 biases the taper pin 46 downward, so that the seal ring holding member 30 does not have to be lifted. Therefore, the seal ring holding member 30 remains positioned with respect to the workpiece 20 during the subsequent steps.

  In parallel, since the first moving claw 51 is urged by the compression spring 67, the first moving claw 51 comes into sliding contact with the tapered portion 32 of the seal ring holding member 30. The first moving claw 51 further lowered hits one end 71 of the seal ring 70. At this time, the final moving claw 53 has not yet hit the other end 72 of the seal ring 70.

  When the first moving claw 51 is further lowered, as shown in FIG. 5, one end 71 of the seal ring 70 slides down the cylindrical portion 33, moves to the outer periphery of the movable pulley 23, and fits in the annular groove 24 (one seal ring). End fitting process). Since the L-shaped bracket 48 hits the stopper 54, the lowering operation of the first moving claw 51 is completed. The elevating plate 43 shown in FIG. Since the side springs 61 are contracted, the elevating plate 43 is smoothly lowered.

The last moving claw 53 is lowered while being delayed. The other end 72 of the seal ring 70 slides down the cylindrical portion 33 and moves to the outer periphery of the movable pulley 23, but does not yet fit into the annular groove 24.
When the final moving claw 53 is further lowered, as shown in FIG. 6, the other end 72 of the seal ring 70 is fitted into the annular groove 24 (the other end fitting process of the seal ring).
Since the L-shaped bracket 49 hits the stopper 54, the lowering operation of the final moving claw 53 is completed. By fitting all the holding pawls 52 forward at this timing, the fitting is ensured.

  Note that the order in which the retaining pawls 52 are advanced may be all at the same time, but the retaining pawls 52 that are in the same phase as the first moving pawl 51 that exists at the position of 0 ° in FIG. The holding pawl 52 existing at the position of ° is advanced in order so as to advance, and finally, the holding pawl 52 existing in the same phase as the final moving pawl 53 is advanced, finish. That is, the forward movement is started from the holding pawl 52 corresponding to one end 71 of the seal ring 70 and ends at the holding pawl 52 corresponding to the other end 72. This makes the fitting more reliable.

Next, focusing on the movement of the seal ring 70, the operation of the first and final moving claws 51 and 53 will be described.
As shown in FIG. 7A, the seal ring 70 is held on the cylindrical portion 33. One end 71 is provided with a first step 73 whose inner diameter protrudes from the outer diameter, and the other end 72 is provided with a second step 74 whose outer diameter protrudes from the inner diameter. First, the first moving claw 51 comes into contact with one end 71 and starts to lower the one end 71.

As shown in FIG. 7B, one end 71 of the seal ring 70 is fitted into the annular groove 24.
At this time, the other end 72 of the seal ring 70 is above the annular groove 24 while being pushed down by the final moving claw 53. Further, when the other end 72 is lowered by the final moving claw 53, the second step 74 moves from the front side of the drawing to the back side to the first step 73.
As a result, as shown in FIG. 7C, the other end 72 of the seal ring 70 is fitted into the annular groove 24 so that the second step 74 overlaps the first step 73. Therefore, there is no fear that the fitting failure described in FIGS. 10C and 10D will occur, and even if it occurs, the frequency of occurrence is very small.

Note that when the seal ring 70 is made of a soft material, the self-restoring property is poor. If the fitting failure described in FIGS. 10 (c) and 10 (d) occurs, it is manually returned to the form shown in FIG. 10 (a), as shown in FIG. 10 (b). The work is not easy and takes time because the seal ring 70 is difficult to return to its original shape. In addition, the seal ring 70 may be damaged.
In this regard, according to the present invention, as described above, since a fitting failure does not occur, a correction operation is not required, productivity can be easily improved, and there is no fear of damaging the seal ring.

  The workpiece 20 may be a piston that fits in the cylinder in addition to the CVT movable pulley 23. In short, the work 20 has an annular groove on the outer periphery, and a seal ring 70 that is divided at one place in the annular groove. Any type is acceptable as long as it is assembled.

  Further, in the embodiment, the seal ring assembling apparatus 10 is a vertical apparatus in which the seal ring 70 moves from top to bottom. However, the seal ring assembly apparatus 10 may be a horizontal apparatus in which the seal ring 70 moves horizontally or an apparatus that moves obliquely. Good.

  The present invention is suitable for a seal ring assembling technique for assembling a seal ring in an annular groove of a CVT movable pulley.

  DESCRIPTION OF SYMBOLS 10 ... Seal ring assembling apparatus, 13 ... Work support member, 20 ... Work, 23 ... Movable pulley, 24 ... Annular groove, 30 ... Seal ring holding member, 33 ... Tube part, 44 ... Claw moving mechanism, 51 ... Moving claw (First moving claw), 53 ... moving claw (final moving claw), 52 ... holding claw, 54 ... stopper, 70 ... seal ring, 71 ... one end of the seal ring, 72 ... other end of the seal ring 73 ... 1st level | step difference, 74 ... 2nd level | step difference, L ... Relative difference.

Claims (6)

In a seal ring assembling apparatus for assembling a seal ring divided at the joint into an annular groove provided on the outer periphery of the workpiece,
The seal ring has, at one end, a first step where the inner diameter side protrudes from the outer diameter side, and a second step, the outer diameter side protrudes from the inner diameter side at the other end.
The seal ring assembling apparatus is
A workpiece support member for supporting the workpiece;
A seal ring holding member that has a cylindrical portion having the same outer diameter as the outer periphery, holds the seal ring before assembly in the cylindrical portion, and is in contact with the workpiece supported by the workpiece support member;
A moving claw that comes into contact with the seal ring held by the seal ring holding member;
A claw moving mechanism for moving the moving claw from the seal ring holding member to the workpiece;
A stopper for ending the movement of the moving claw at a position where the seal ring fits in the annular groove,
The moving claw is composed of a plurality of claws arranged so as to surround the annular groove and starting with the first moving claw and ending with the final moving claw, and the first moving claw first contacts one end of the seal ring. The plurality of claws move so that the one end portion starts moving and the last moving claw finally comes into contact with the other end portion of the seal ring and starts moving the other end portion. A seal ring assembling apparatus, wherein the seal ring assembling apparatus is arranged with a relative difference in direction.   The seal ring assembling apparatus according to claim 1, further comprising a holding claw that moves in a direction orthogonal to the moving direction and presses the seal ring into the annular groove.   The seal ring assembling apparatus according to claim 2, wherein the holding claws are provided in the vicinity of each of the moving claws.   The said seal ring holding member serves also as the conveyance member which conveys this seal ring to the vicinity of the said workpiece | work in the state which hold | maintained the said one seal ring, The any one of Claims 1-3 characterized by the above-mentioned. The seal ring assembling apparatus as described. The seal ring has a first step in which the inner diameter side protrudes from the outer diameter side at one end, and a second step in which the outer diameter side protrudes from the inner diameter side at the other end. A seal ring assembling method for assembling the seal ring in an annular groove provided on the outer periphery,
A seal ring holding member having a cylindrical portion having the same outer diameter as the outer periphery, a moving claw composed of a plurality of claws arranged so as to surround the annular groove and starting with the first moving claw and ending with the final moving claw, and these movements Preparing a claw moving mechanism for moving the claw, and a stopper for terminating the movement of the moving claw at a position where the seal ring fits in the annular groove;
A work setting process for setting a work on a work support member;
A seal ring holding step of holding the seal ring on the seal ring holding member;
An abutting step of abutting the seal ring holding member against the workpiece such that the cylindrical portion is continuous with the outer periphery of the workpiece;
One end fitting step of the seal ring that moves one end of the seal ring with the first moving claw and fits into the annular groove;
After this, the other end of the seal ring is moved by the final moving claw, and the other end fitting process of the seal ring to be fitted in the annular groove,
A method for assembling a seal ring, wherein the second step is superimposed on the first step fitted in the annular groove.   6. The seal ring assembling method according to claim 5, wherein the seal ring is made of a soft material having poor self-restoring property.

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