JP2911299B2 - Elastic ring assembly device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic ring used for attaching an elastic ring, which is a soft part such as an O-ring made of rubber or synthetic resin, to an inner peripheral annular groove formed in a hole of a work. The present invention relates to a ring assembling device.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG. 10, an inner peripheral annular groove (3) formed in a hole (2) of a work (1).
When attaching an elastically deformable steel ring (4) such as a snap ring or a piston ring to the workpiece, a taper guide (6) formed through a tapered hole (5) that gradually decreases in diameter downward is formed through the work. (1) A steel ring (4) which is positioned and fixed on the steel ring (4) which is concentrically aligned with the hole (2) and the tapered hole (5), and is fitted in the tapered hole (5) in a horizontal posture.
Is pressed from above the taper guide (6) to the position of the inner peripheral annular groove (3) of the work (1) while reducing the diameter with the press-fitting punch (8) to reduce the elastic restoring force of the steel ring (4). Utilizing it, it is fitted into the inner peripheral annular groove (3).

[0003]

Even if the same ring is used, the rubber or synthetic resin O used to prevent oil leakage or the like is used.
An elastic ring, which is a soft part such as a ring, has a smaller elastic restoring force in a radially outward direction than a diameter-reducing force, and therefore uses the diameter-reducing force in an outer peripheral annular groove formed on an appropriate shaft. It is possible to insert the elastic ring into the tapered hole (5) of the taper guide (6) gradually by the press-fitting punch (8) as in the case of the steel ring (4). Therefore, when the work (1) is deformed and held at the position of the inner circumferential groove (3), the work (1) does not elastically recover radially outward at the position of the inner circumferential groove (3). There is a problem that the elastic ring cannot be fitted into the circumferential annular groove (3).

[0004] Known techniques for assembling an elastic ring include those described in Japanese Utility Model Laid-Open No. 2-85536, Japanese Utility Model Laid-Open No. 63-64434, and Japanese Patent Application Laid-Open No. 62-9837. .

The present invention has been proposed in view of the above problems, and a rubber or synthetic resin elastic ring having a small elastic restoring force radially outward is securely fitted into an inner circumferential groove of a work. It is an object of the present invention to provide an elastic ring assembling device that can perform the above-described operations.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a taper guide having a penetrating tapered hole fixed to a lower support and having a diameter gradually reduced downward. A device main body mounted on a possible upper support, wherein the device main body is rotatable around the axis of the upper support, and is fixed so as to be able to penetrate through the tapered hole of the taper guide. A hollow shaft-shaped holder provided with a flange-shaped ring holding portion capable of locking and holding an elastic ring at a lower end,
The outer peripheral surface of the holder can be opened and closed in the radial direction via a mounting shaft at an evenly distributed portion, and the lower end is pivotally attached to the lower end by applying a biasing force in the always open direction. A plurality of pressing claws opposed to the ring holding portion at a predetermined interval, and are pivotally pivotally connected to the holder via a pivot,
A push shaft having an upper end protruding above the holder, and having at the lower end an L-shaped push portion formed at a lower end between the lower end portion of the pressing claw and the ring holding portion of the holder so as to be able to protrude and retract radially outward; A swinging mechanism for swinging the push-in shaft by engaging the upper end protruding portion of the push-in shaft, and a rotating mechanism for rotating the holder in a direction around the axis; The elastic ring latched and held by the ring holding portion can be pressed downward by a pressing claw that rotates in the closing direction against the biasing force by sliding contact with the tapered hole of the tapered guide, And it is characterized in that it is delivered in such a manner that it can be pushed radially outward by a pushing portion of the pushing shaft.

[0007]

The elastic ring held by the ring holding portion at the lower end of the holder is transferred to the inner peripheral surface by the frictional force with the inner peripheral surface of the tapered hole of the taper guide in association with the lowering operation of the holder. Thereafter, the pressing claw, which gradually rotates in the closing direction by sliding contact with the tapered hole, is pushed along the tapered hole to the position of the inner peripheral annular groove in the hole of the work concentrically coincident with the tapered hole. . When the elastic ring is held at the position of the inner peripheral annular groove, the pushing shaft swings via the pivot and the pushing portion at the lower end projects radially outward of the holder, and then the holder rotates in the direction around the axis. The pushing part of the pushing shaft turns together with the holder. Then, the elastic ring is pressed by the pushing portion of the rotating pushing shaft, and is pushed into the inner circumferential annular groove of the work.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a device for assembling an elastic ring according to the present invention will be described below with reference to FIGS.

In FIG. 1 to FIG. 9, reference numeral (10) denotes a soft part such as an O-ring made of rubber or synthetic resin which is fitted into an inner peripheral annular groove (3) in a hole (2) of a work (1). A certain elastic ring, (11) is an upper movable table which is an upper support provided in a process of assembling the elastic ring (10), and (12) is arranged at a fixed position below the upper movable table (11). Both tables (1
1) and (12) are provided so as to be individually movable horizontally and vertically. (13) is an apparatus main body mounted on the tip of the upper movable table (11).
Is composed of a holding mechanism (14), a swing mechanism (15), and a rotating mechanism (16). (17) is a taper guide fixedly penetrated to the tip of the lower movable table (12). This taper guide (17) has a penetrating tapered hole (18) whose diameter gradually decreases downward. In the elastic ring assembly position, the lower end surface of the taper guide (17) comes into contact with the upper opening end surface of the hole (2) of the work (1), and the taper hole (18) of the taper guide (17) and the work (1). ) Is held concentrically with the hole (2).

A hollow shaft-shaped holder (20) constituting the holding mechanism (14) is rotatably penetrated and held downward at the tip of the upper movable table (11) via a bush (21). It is. As shown in FIGS. 3 to 6, the holder (20) has a small-diameter portion (23) at a lower end surface of a large-diameter portion (22) that is removably inserted into a taper hole (18) of a taper guide (17). ) And a large diameter part (2
An annular mounting flange (24) is formed at a substantially intermediate portion of (2), and a part of the outer peripheral surface is cut off below the mounting flange (24), so that a plurality of pairs of mounting flanges are installed at circumferentially equally distributed portions. Piece (25)
(25) to form a mounting flange (24) and a mounting piece (2).
5) An annular mounting slit (26) is provided between the small-diameter portion (23) and the flange-shaped ring holding portion (2).
7) is formed.

A slit-shaped mounting hole (28) is formed in the center position of the holder (20) along the axial direction, and the mounting hole (28) is formed in the upper end surface of the large diameter portion (22). A communication opening is formed in the hole (29). The mounting hole (28) of the holder (20) is opened on the outer peripheral surface, that is, the outer peripheral surface from the portion above the mounting flange (24) of the large diameter portion (22) to the small diameter portion (23). In addition, each of the mounting pieces (2
5) Between (25), a plurality of mounting grooves (30a) (30b)
(30c) and (30d) are formed in the axial direction. Of these mounting grooves, the mounting groove (30d) is formed at a part of the opening edge of the mounting hole (28). The mounting grooves (30a) to (3)
In 0d), the upper end is formed up to a part of the mounting flange portion (24), and the lower end is opened to the lower end surface of the large diameter portion (22).

Each pair of mounting pieces (2) of the holder (20)
5) Pressing claw (32) on mounting shaft (31) to (25)
Are pivotally attached to each of the mounting grooves (30a) to (30a).
d). The pressing claw (32) has a groove (33) formed at the upper end corresponding to the mounting slit (26) of the holder (20), and the lower end thereof has a large diameter portion (2).
It protrudes downward from the lower end surface of 2) and is opposed to the upper surface of the ring holding portion (27) of the holder (20) at a predetermined interval. Mounting slit (26) for holder (20)
And a ring-shaped diameter-reducing spring (34) is fitted into the groove (33) of the pressing claw (32).
Due to the diameter reducing force of 4), the lower end of the pressing claw (32) is constantly urged radially outward, and when the holder (20) is inserted into the tapered hole (18) of the tapered guide (17), the pressing claw is pressed. (32)
The lower end is gradually reduced in diameter while sliding on the inner peripheral surface of the tapered hole (18).

The communicating holes (2) of the holder (20) communicate with each other.
8) and a push-in shaft (35) are disposed in the through-hole (29), and the intermediate bent portion of the push-in shaft (35) can be swung via the pivot (37) at the upper end of the mounting hole (28). Pivot to. The pushing shaft (35) has a projecting piece (38) (3
9) and a ring holding portion (27) of the holder (20) and the mounting groove (3) at the lower end.
It has a pushing portion (41) bent in an L-shape so as to be able to protrude and retract in the radial direction between the pressing claw (32) and the lower end surface of the pushing claw (32) arranged at 0a) to (30d).

The pushing shaft (35) is provided with a swing mechanism (15).
Is rotated about the pivot (37). In the swing mechanism (15), an operating cylinder (45) is installed on an upper movable table (11), and a substantially L-shaped release lever (47) is attached to the tip of a cylinder rod (46).
The release lever (47) uses a nut (49) to penetrate and fix the release rod (50) to the tip of the lever body (48), and lowers the release rod (50) with the pushing shaft (35). It is held between the projections (38) and (39) of the upper fork (40). C having a rising wall (51) at the upper end of the holder (20) protruding above the upper movable table (11)
A ring-shaped mounting body (52) is mounted and fixed with screws (53), and a protruding piece (38) of the upper forked portion (40) of the pushing shaft (35) is mounted on a rising wall (51) of the mounting body (52). And the pressing member (54) is horizontally fixed through. The pressing member (54) is a hollow shaft (56) having an open distal end surface fixed to the mounting body (52) using a nut (55).
The pressing rod (57) is slidably inserted therein, and the pressing rod (57) is always outwardly moved by the elastic force of a pressing spring (not shown) housed in the hollow shaft (56). The pushing piece (3) is pushed by the pushing rod (57).
8) is pressed against the release rod (50).

The holder (20) is provided with a rotating mechanism (1).
6) is driven to rotate in a predetermined direction. The rotation mechanism (16) fixes and mounts a rotary pulley (61) on an upper part of a mounting flange (24) of the holder (20), and also mounts an actuator, for example, a drive motor on a lower surface of the upper movable table (11). (62), and attach this drive motor (6).
2) A drive belt (64) is wrapped around the drive pulley (63) and the rotary pulley (61), and the driving force of the drive motor (62) is transmitted through the drive belt (64).

Next, the operation of the device of the present invention will be described as follows. During the initial operation, the release lever (47) of the swing mechanism (15) is held at the retracted end, and the pushing shaft (3
The protruding piece (38) of the forked part (40) of (5) is pressed by the release lever (47) to the pressing rod (57) of the pressing member (54).
The pressing portion (41) at the lower end of the pressing shaft (35) is retracted and held inside the lower end of the mounting hole (28) of the holder (20). . Also,
It is assumed that the lower end of the pressing claw (32) is expanded by the elastic force of the diameter reducing spring (34).

Work (1) positioned and held at a fixed position
Move the taper guide (17) up and work (1)
Hole (2) and taper hole (18) of taper guide (17)
And concentrically. On the other hand, when the elastic ring (10) is locked and held on the outer peripheral surface of the ring holding portion (27) of the holder (20) at the elastic ring supply position, the upper movable table (11) is moved vertically or horizontally by moving it or the like. The holder (20) is moved above the lower movable table (12), and is held at a position concentric with the taper guide (17). Then, the upper movable table (11) descends,
The tip of the holder (20) enters the tapered hole (18) of the taper guide (17), and the elastic ring (10) locked and held by the ring holder (27) of the holder (20) engages the taper guide (17). ) Comes into contact with the inner peripheral surface of the tapered hole (18). The holder (20) descends after the elastic ring (10) comes into contact with the inner peripheral surface of the tapered hole (18) of the taper guide (17). 27) and is delivered and held in a horizontal posture on the inner peripheral surface of the tapered hole (18).

Since the lower end of the pressing claw (32) is constantly urged radially outward by the diameter-reducing spring (34), the holder (20) is inserted into the tapered hole (18) of the taper guide (17). As a result, the lower end of the pressing claw (32) slides against the inner peripheral surface of the tapered hole (18) against the urging force of the diameter-reducing spring (34) and gradually closes. The ring (10) comes into contact with the lower end surface of the pressing claw (32), and is then pressed downward by the descending pressing claw (32), and the hole of the work (1) concentrically coincides with the tapered hole (18). It is pushed to the position of the inner peripheral annular groove (3) in (2). At this time, since the elastic ring (10) has a smaller diameter than the hole (2) of the work (1), as the elastic ring (10) is pushed into the hole (2) of the work (1) from the tapered hole (18), FIG. As shown in the figure, the outer periphery of the pressing claw (32) is substantially equally spaced from the lower surface of the pressing claw (32) and the upper surface of the ring holding portion (27) of the holder (20) except for the portion pressed by the pressing claw (32). The part is held in a state of being depressed inward.

When the elastic ring (10) is held at the position of the inner peripheral annular groove (3) of the work (1), the cylinder rod (4) of the operating cylinder (45) of the swing mechanism (15).
6) protrudes, the release lever (47) moves forward, the release rod (50) is held at the center position of the holder (20), and the pressing of the pushing shaft (35) against the protruding piece (38) is released.
Then, the protruding piece (38) of the pushing shaft (35) is moved to the release rod (50) held at the center position of the holder (20) by the pressing rod (57) of the pressing member (54) to which the urging force is applied. Pressed. As a result, the pushing shaft (35) is pivoted (37).
, The pushing portion (41) projects radially outward, and the elastic ring (10) is located at a position below the mounting grooves (30a) to (30d) of the holder (20). It is pressed by the part (41) and is pushed into the inner peripheral annular groove (3) of the work (1).

Thereafter, the drive motor (62) of the rotation mechanism (16) is driven, and the rotation drive force is transmitted to the rotation pulley (61) via the drive belt (64), and the holder (20) is moved. Rotate in a predetermined direction. Then, the pushing shaft (35) rotates together with the holder (20), and the elastic ring (1) located in the inner peripheral annular groove (3) of the work (1).
0) is pressed radially outward, and the inner circumferential annular groove (3)
Pushed into. When the pushing shaft (35) rotates, the projecting piece (38) at the upper end pivots around the release rod (50) while slidingly contacting the outer peripheral surface of the release rod (50) of the release lever (47).

When the elastic ring (10) is pushed into the inner annular groove (3) of the work (1) in this way, the cylinder rod (46) of the working cylinder (45) retreats and the pressing member (54). Is pressed against the urging force of the pressing spring by the release rod (50) of the release lever (47), and the pushing shaft (35) rotates about the pivot (37). The protruding piece (38) comes into contact with the end face of the hollow shaft (56) of the pressing member (54), and the pushing part (41) retreats into the mounting hole (28) of the holder (20). Thereafter, the upper movable table (11) is raised, and the holder (2) is moved.
0) is pulled out from the tapered hole (18) of the tapered guide (17) attached to the lower movable table (12), and the elastic ring (1) for the inner peripheral annular groove (3) of the work (1).
Assembly of 0) is completed.

[0022]

According to the present invention, an elastic ring made of rubber or synthetic resin having a low elastic restoring force can be securely fitted into an inner circumferential groove formed in a hole of a work. Moreover, the structure is simple, the production is easy, and the production cost is low.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an assembling apparatus according to the present invention.

FIG. 2 is a partial plan view of FIG. 1;

FIG. 3 is a side view of the holder shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a plan view of the holder.

FIG. 6 is a bottom view of the holder.

FIG. 7 is a sectional view taken along the line BB of FIG. 1;

FIG. 8 is a sectional view taken along line CC of FIG. 1;

FIG. 9 is an explanatory plan view showing a deformed state when the elastic ring is assembled.

FIG. 10 is a longitudinal sectional view showing a conventional assembling apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Elastic ring 11 Upper support body 12 Lower support body 13 Device main body 15 Swing mechanism 16 Rotating mechanism 17 Taper guide 18 Taper hole 20 Holder 27 Ring holding part 31 Mounting shaft 32 Pressing claw 35 Pushing shaft 37 Axis 41 Pushing part

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23P 19/02

Claims (1)

(57) [Claims] 1. A taper guide having a tapered hole penetratingly fixed to a lower support and having a diameter gradually reduced downward, and an apparatus main body mounted on a movable upper support. A flange-shaped ring retainer which is fixedly rotatable about the axis of the upper support body in a direction around an axis, and is penetrably insertable into the tapered hole of the taper guide, and is capable of retaining an elastic ring at a lower end thereof. A hollow shaft-shaped holder provided with a portion, a pivotal opening and closing can be performed in a radial direction via a mounting shaft at a portion equally distributed on the outer peripheral surface of the holder, and a biasing force in a normally open direction is applied to a lower end portion of the holder. A plurality of pressing claws, the lower end of which is opposed to the ring holding portion of the holder at a predetermined interval, and which is pivotally mounted in the holder via a pivot, and the upper end of which is attached to the holder. At the lower end, the lower end of the pressing claw is made to protrude upward. A push shaft formed with an L-shaped push portion that can protrude and retract outward in the radial direction between the shaft and the ring holding portion of the holder, and a swing that swings the push shaft by engaging the upper end protruding portion of the push shaft. A mechanism and a rotation mechanism for rotating the holder in the direction around the axis. In connection with the lowering operation of the apparatus main body, the elastic ring locked and held by the ring holding portion of the holder is formed into a tapered hole of the taper guide. In addition, it is possible to transfer the pressing member downwardly by a pressing claw that rotates in the closing direction against the urging force by sliding contact with the tapered hole, and to be capable of being pushed radially outward by a pushing portion of the pushing shaft. Characteristic elastic ring assembling device.