JPS5817709Y2 - Device for externally fitting a flexible ring - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for mechanically fitting a flexible ring for sealing or friction transmission onto a member having an outer circumferential annular groove.

A solid ring-shaped member, such as an O-ring, made of a material having extensibility, elasticity, and flexibility such as rubber (in this specification, this is referred to as a flexible ring).

) into a member having an annular groove on the outer periphery under tension, it is extremely difficult to mechanically fit the ring onto a member having an annular groove around the outer periphery, since the ring is flexible, so there is a method of expanding the entire ring and fitting it to the outside. etc. were used.

However, with this method, the entire ring has to be expanded beyond the state in which it is fitted into the annular groove, which may result in the flexible ring being cut beyond its tension limit, or permanently deformed and loosened in the state in which it is fitted. This is not desirable as it may cause problems.

In addition, there was a drawback that the ring that was fitted onto the outside was likely to be twisted.

This invention solves the above-mentioned drawbacks, and does not apply excessive tension to the flexible ring when fitting the member into the annular groove, and allows the flexible ring to be fitted sequentially along the annular groove, thereby preventing the ring from twisting. To provide a flexible ring external fitting device which can quickly and reliably be externally fitted without causing damage such as scratches to the ring portion protruding from the annular groove.

Embodiments of this invention will be described below with reference to the accompanying drawings.

First, an example of a member having an outer peripheral annular groove and a flexible ring to be fitted into the annular groove is shown in FIGS.

The member 1 is a small-diameter disc-shaped component having an outer circumferential annular groove 1a and a boss 1b, and the flexible ring 2 is attached to the annular groove 1a of the member 1.
A small O-ring made of a material having extensibility, elasticity, and flexibility such as rubber and having an inner diameter smaller than the bottom diameter of the annular groove 1a and a width smaller than the width of the annular groove 1a. It is a part.

Next, the method of externally fitting a flexible ring using the device of this invention will be explained with reference to FIGS. 2A to 2.

(1) Place the member 1 on the jig 3 so that the outer annular groove 1a is approximately horizontal (see A and A).

In this case, as a means for positioning the member 1, the boss 1b of the member 1 may be fitted into a recess 3a formed in the jig 3 as shown in the drawing, or a recess of a shape corresponding to the outer peripheral contour of the member 1 may be used. Various methods can be used, such as forming a recess in the jig 3 and fitting the member 1 into the recess for positioning.

(2) Next, the flexible ring 2 is eccentrically placed on the member 1 as shown in A with respect to the member 1.

The eccentricity in this case does not need to be particularly strict, but it is important to ensure that the flexible ring 2 protrudes from the member 1 and a crescent-shaped gap is formed between the inner circumference of the ring and the outer circumference of the member 1 as shown in A. It is necessary to.

(3) Next, the part a of the protruding portion of the flexible ring 2 is held at a position corresponding to the level of the annular groove 1a of the member 1 by the presser member 4, and at the same time, the member is held by the presser member 4. 1 to the jig 3 from above and fix it (see A and A).

(4) Next, the guide pin 5 is made approximately perpendicular to the jig 3 and inserted from above into the approximately triangular gap formed by the inner circumference of the ring, the outer circumference of the member, and the holding member 4 (a and (See mouth).

(5) When the guide pin 5 is inserted into point A in one of the triangular gaps as shown in A, the member 1 with the member 1 at the center
In a circular path shown by a dashed line in FIG. 2A, which has a radius slightly larger than the radius of On the other hand, it is rotated around the corner to point B on the opposite side of point A.

As the guide pin 5 moves, the flexible ring 2 is sequentially fitted into the annular groove 1a of the member 1 as shown in C and 2, and if the guide pin 5 is pulled up at point B,
The flexible ring 2 is completely fitted into the annular groove 1a.

During this movement of the guide pin 5, the point B side of the flexible ring 2 is prevented from sliding out by the holding member 4, so that the portion initially fitted into the annular groove 1a does not come off.

Also, if the guide pin 5 is placed in the other triangular gap B
It goes without saying that once inserted into the annular groove, the flexible ring 2 is fitted into the annular groove by moving the guide pin 5 clockwise along a circular path to the point A and pulling it up.

In this example, a case has been described in which a flexible ring having a similar cross-sectional shape is fitted into an annular groove having a rectangular cross-sectional shape.

The same applies when a flexible ring having a rectangular, round, or trapezoidal cross-section is fitted into an annular groove having a rectangular, semicircular, or trapezoidal cross-section.

In addition, this invention can be applied not only to fitting a flexible ring into an annular groove of a circular member, but also to fitting a flexible ring into an outer circumferential groove of an elliptical, oval, pentagonal, hexagonal, etc. member. This can be similarly applied when externally fitting.

Note that in the case of a non-circular member, the path of the guide pin also substantially follows the outer circumferential shape of the member.

An example of a basic device based on this invention is shown in FIG.

In this FIG. 3, 3 is a jig, 1 is a member fixed on the jig 3, and 2 is a member placed eccentrically with respect to the member 1 in order to fit into the annular groove 1a of the member 1. It is a flexible ring.

A shaft 6 is attached to a bearing 7 and is raised and lowered by appropriate means, but does not rotate.A shaft 6 is fixed to the lower end of the shaft 6, and is attached to the protruding portion of the flexible ring 2 and the upper surface of the member 1. It is a presser member that extends over a part of the body.

8 is a shaft mounted on a bearing 9 and is raised, lowered, and rotated by appropriate means; 10 has one end fixed to the lower end of the shaft 8;
It is an arm with a guide pin 5 hanging down at the other end.

As shown in the figure, when the flexible ring 2 is placed on the member 1, the shaft 6 is lowered and the holding member 4 aligns a part of the protruding portion of the flexible ring 2 with the level of the annular groove 1a. At the same time, the member 1 is held from above and fixed to the jig 3.

Next, the shaft 8 is lowered and the guide pin 5 is inserted into a position such as point A in FIG. B in Figure 2 along the outer periphery
Rotate it until it looks like a dot.

The center of the circular path of the guide pin 5 substantially coincides with the center of the shaft 8 and the center of the member 1.

That is, the member 1 is placed on the jig 3 with its center on the center line of the shaft 8.

By the movement of the guide pin 5 as described above, the flexible ring 2 is sequentially fitted into the annular groove 1a, and when the guide pin 5 reaches point B, the shaft 8 rises and the flexible tongue 2 is fitted into the annular groove 1a. Annular groove 1a
completely externally fitted.

Thereafter, the shaft 6 is raised, the member 1 with the flexible ring 2 fitted thereon is removed, a new member 1 and the flexible ring 2 are supplied, the shaft 8 is rotated in the raised position, and the guide pin 5 is removed. takes the position corresponding to point A, and the next cycle begins.

The specific structure of each part of the above device will be explained with reference to FIGS. 4 to 7.

FIG. 4 shows a unit of member presser and ring holding device.

In this figure, reference numeral 19 denotes a frame in which the bearing part 7 is integrated, and 6 is supported by the bearing part 7 so as to be able to freely slide almost perpendicularly to the surface of the jig 3, and is engaged with the keyway 6a. The shaft 4 is made non-rotatable by the key 7a, and 4 is the shaft 6.
The holding member is fixed to the lower end of the member 1 by a pin 4a, and extends from the upper part of the protruding portion of the flexible ring 2 to a part of the upper surface of the member 1.

11 is the part of the shaft 6 that protrudes from the upper end of the bearing part 7)
The collar 12 fixed by 11a is rotatably attached to the frame 10 and rotated by a handle 13 or a power source (not shown); The cam 15 is rotatably mounted on the frame 10 by a shaft 16, and -
The tip of the arm 15a engages with the cam 14, and the pin 17 implanted at the tip of the other end 15b is a lever that engages with the lower surface of the collar 11.

A compression spring 18 is engaged between the holding member 4 and the bearing portion 7, which gives the shaft 6 a downward movement.
5a engages with the high step part 14a of the cam 14, the lever 15 raises and holds the shaft 6, and the arm 15a engages with the high step part 14a of the cam 14.
The lever 15 lowers the shaft 6 when it engages with the low step portion 14b.

Therefore, when the shaft 12 is rotated to the state shown in FIG. While holding member 1 in a position corresponding to the level, spring 1
Press it from above with force 8 and fix it to jig 3.

Furthermore, by turning the shaft 12 to the right from the illustrated position, the shaft 6 is raised against the spring 18, and the member 1 can be removed.

Next, FIGS. 5 and 6 show a unit of the guide pin insertion/removal moving device.

In both figures, 20 is a frame that integrates the bearing part 20a, 8 is a shaft that has a keyway 8a formed in the longitudinal direction and is slidably and rotatably attached to the bearing part 20a, 10
is fixed at one end to the lower end of the shaft 8 by a pole hloa,
An arm with a guide pin 5 hanging down at the other end, 21 is a bearing part 20
This is a collar fixed by appropriate means to the portion of the shaft 8 protruding from the upper end of the shaft 8.

Further, 22 is a pinion that is rotatably attached to the bearing portion 20a with respect to the shaft 8, and is coupled to the shaft 8 by a key 22H that engages with the keyway 8a and moves together, and 23 is a bearing that is slidable in the horizontal direction. A rack plate is attached to the part 20a and the tooth part 23a meshes with the pinion 22, and 24 is a compression spring that is engaged between the arm 10 and the bearing part 20a and gives the shaft 8 a downward accommodation property. .

25 is a shaft supported by the frame 20 so as to be rotated by a handle or a power source (not shown); 26 is a cam having a high step portion 26 a and a low step portion 26 b; and a cam fixed to the shaft 25; A cam 27 has a high portion 27 a and a low portion 27 b and is fixed to the shaft 25 .

Further, 28 is rotatably attached to a shaft 29 implanted in the frame 20, the tip of the arm 28a engages with the cam 26, and the pin 28C at the tip of the other arm 28b is attached to the lower surface of the collar 21. A lever 29 is rotatably mounted on a shaft 30, and the tip of the arm 29a engages with the cam 27, and the lever 29 engages with the cam 27.
9 Insert the rack plate 2 into the elongated hole 29C formed at the tip of 9B.
This is a lever that the pin 23b of No. 3 engages with.

In this guide pin insertion/removal movement device, when the shaft 25 is rotated and the lever 28 is engaged with the high step portion 26a of the cam 26, the lever 28 rotates to the left from the illustrated position to raise and hold the shaft 8. , cam 27, lever 29, rack plate 23, and pinion 22, the shaft 8 rotates and the guide pin 5 moves to the first position.
Take the position corresponding to point A in the figure.

Therefore, the member 1 and the ring 2 are supplied onto the jig 3, and the member 1 is fixed by the member presser and ring holding device shown in FIG. 4, when the shaft 25 is rotated to the right, the lever 28 moves from the high step part 26 a of the cam 26 to the low step part 26 while the angular position of the guide pin 5 remains unchanged.
The lever 28 rotates to the right in order to engage the lever 28, the shaft 8 descends due to the spring 24 and its own weight, and the guide pin 5 moves into the crescent-shaped gap formed by the member 1 and the protruding portion of the flexible ring 2. It is inserted at point A (see Figure 1 A).

When the shaft 25 is further rotated, the lever 28 continues to engage the lower part 26b of the cam 26, so that the shaft 8 remains in the same position, but the arm 29a of the lever 29 engages the lower part 26b of the cam 27.
7b to the high part 27a, the lever 29 rotates to the right, and the arm 29b moves the rack plate 23 to the left, so the pinion 22 rotates to the left in FIG. move.

As a result, the arm 10 rotates, and the guide pin 5 moves counterclockwise from point A in FIG.

Subsequent rotation of shaft 25 then causes lever 28 to move cam 2
6 engages with the high step portion 26a from the low step portion 26b, the lever 28 is rotated to the left, the shaft 8 is raised, and the external fitting of the flexible ring 2 is completed.

Then, the arm 29a of the lever 29 touches the high part 27 of the cam 27.
Since the lever 29 engages with the lower part 27b from a, the lever 29 rotates to the left and moves the rack plate 23 to the right, the pinion 22 rotates to the right as shown in FIG. 6, and the guide pin 5 moves to the position corresponding to point B in FIG. From A
It moves backward along the circular path to the corresponding point position and prepares for the next cycle.

FIG. 7 shows an example of a flexible ring supply device that eccentrically supplies the flexible ring 2 to the member 1 fixed on the jig 3.

In this figure, 30 is, for example, a shaft that is raised and lowered by a hydraulic cylinder (not shown) and rotated back and forth by a predetermined angle by, for example, a hydraulic motor.
1 is fixed to a shaft 30 at one end, and has, for example, a vacuum chuck 32 at the other end, and is caused to rise, fall, and swing between points A and B in the figure as shown by the shaft 30. An arm, 33, a tube connecting the chuck 32 and a vacuum source, 34
1 is a supply gutter that sequentially moves the flexible ring 2 inserted into a hopper or magazine (not shown) to point A by the action of a pie break or the like.

In this flexible ring supply device, when the member 1 is placed on the jig 3, the chuck 32 attracts and holds the nong 2 at point A, and after the arm 31 rises slightly and swings to point B,
After descending a predetermined distance, the chuck 32 is turned off.

As a result, the flexible ring 2 is eccentrically placed on the member 1, and as shown in FIG. The flexible ring 2 hangs down at the position where the outer periphery of the member 1 and the flexible ring 2
Place it in a position where a gap is formed between the inner periphery of the

Thereafter, the arm 31 is raised and swung again to return to point A in preparation for the next cycle.

In this way, the flexible rings 2 are successively supplied onto the jig 3.

Note that the operation control system for the arm 31 or the shaft 30 may be either automatic or manual.

Moreover, the members 1 can also be supplied one after another onto the jig 3 using a device similar to that used for the ring 2.

If the devices shown in FIGS. 4, 5, and 7 described above are combined to form a device for externally fitting the flexible ring according to this invention, the device can be fitted automatically, semi-automatically, or manually. The external fitting of the ring 2 onto the member 1 can be performed one after another quickly, reliably, and easily.

As detailed above, this invention provides a device that can quickly, reliably, and easily fit a flexible ring onto a member having an annular groove, and applies tension to the flexible ring. Since the guide pin only contacts the inner circumferential surface of the ring, there is no wear on the side surface of the ring protruding from the annular groove, the outer circumference, or the corner in the case of a square ring, and there is no wear on the O-ring, Extremely effective for external fitting of labyrinth backings, etc.

In addition, according to this device, a member having an annular groove is pressed from above using a holding member to prevent a part of the flexible ring from lifting up from the annular groove and to prevent the fitted part from coming off from the opposite side. Since the guide pin is moved concentrically with the annular groove while being pressed and held together, the flexible ring can be reliably fitted into the annular groove without forcing it to expand, and is extremely effective for automating assembly. Mass production of products requiring this type of assembly can be facilitated and production costs reduced.

[Brief explanation of drawings]

Fig. 1 shows an example of a member having an annular groove and a flexible ring to which this invention can be applied; FIG. Fig. 2 shows the process sequence for externally fitting a flexible ring using the device of this invention, in which A is a plan view of the external fitting preparation state, the opening is a partially cutaway side view, and C and 2 are intermediate steps. FIG. Figure 3 is a perspective view showing a typical embodiment of this invention;
5 is a partially cut-away side view of the member presser and ring holding device, FIG. 5 is a partially cut-away side view of the guide pin insertion/removal and movement device, and FIG. 6 is the VI-FIG. VI
The cross-sectional view along the line, FIG. 7, is also a plan view of the flexible ring supply device. 1... Member having an outer circumferential annular groove, 1a...
...Outer annular groove, 2...Flexible ring, 3...
...Jig, 4...Press member, 5...
・Guide pin.

Claims (1)

[Scope of utility model registration request] A jig for placing a member having an outer circumferential annular groove in a predetermined position so that the annular groove is approximately horizontal; and a jig for transporting a flexible ring to an eccentric position on the member; a flexible ring supply device that protrudes from the member, hangs down at a position corresponding to the level of the annular groove, and is placed at a position that forms a gap between the outer periphery of the member and the inner periphery of the flexible ring; , which extends over the protruding portion of the flexible ring and a portion of the upper surface of the member, and presses the protruding portion from above to hold the protruding portion at a position corresponding to the level of the annular groove of the member, and at the same time holds the member. A member presser and ring holding device that vertically movably supports a presser member that is pressed and fixed from above, and a guide pin that is held almost perpendicularly to the jig, and the guide pin is attached to the protruding portion of the flexible ring. The flexible ring is inserted from above into the gap formed by the inner periphery of the member, the outer periphery of the member, and the presser member, and is rotated approximately one turn along the outer periphery of the member while contacting the inner periphery of the flexible ring. 1. A device for externally fitting a flexible ring into a member having an annular groove, the device comprising a guide pin insertion/removal moving device for raising the guide pin.