JPH0698543B2 - Piston ring assembly device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a piston ring assembling device for automatically assembling a piston ring into a circumferential groove of a piston.

[Conventional technology]

The engine piston is usually equipped with two compression rings and one oil ring. In order to mount these rings on the piston, it is necessary to once enlarge the diameter of the ring and fit it into the circumferential groove of the piston. The conventional piston ring assembly device has a ring supply part, a piston receiving part,
It is composed of a ring expansion holding part and an assembly part. One ring is taken out from the ring supply part, and this ring is expanded and held in the assembly machine and assembled in one circumferential groove of the piston installed in the piston receiving part. Then, this work is repeated to attach three rings to one piston.

Japanese Unexamined Patent Publication No. Hei 1-103238 discloses that a plurality of three rings are respectively held, and a piston ring assembly machine for moving the conical portions to expand the rings is arranged side by side, and one piston is attached to each piston ring assembly. It has been proposed to move between machines and attach three rings.

[Problems to be Solved by the Invention]

The conventional piston ring assembling device cannot hold different types of rings at the same time to assemble them, which not only has poor work efficiency, but also the piston installed in the piston receiving part cannot be assembled due to the tilted piston. Even if there is, it cannot be detected, and it is difficult to deal with it when there are many types of pistons and many types of rings.

The present invention solves the above-mentioned problems of the related art, holds a plurality of different types of rings with a single piston ring assembling device, and reliably detects that the rings are assembled in the circumferential groove of the piston, Another object of the present invention is to provide a piston ring assembling device that can handle various types of pistons.

[Means and Actions for Solving the Problems]

The present invention is directed to a ring cutting section in which a plurality of ring cutting machines for cutting one ring from a magazine are arranged side by side, an indexing section for moving a piston receiver supporting a piston to a ring assembly position, and a ring cutting section. It consists of an assembling head that is movable between the ejected position and the ring assembling position and that can be positioned at multiple points in the vertical direction. A cylindrical support tool for expanding and holding a plurality of rings on the outer circumference, a ring pressing tool slidably fitted on the outer circumference of the support tool, and a drive for moving the ring pressing tool back and forth to multiple points in the axial direction. And a piston ring assembly device provided with a mechanism.

In addition, a piston pedestal in which a spring is loaded on the piston receiver is movably installed toward the switch, and the ring pushed out to the mounting position of the piston groove by the ring pusher is pushed beyond the above position by the ring pusher. It is a piston ring assembling apparatus having a ring assembling determination mechanism adapted to be taken out.

Operate multiple ring cutting machines according to the model, hold one ring each and move it to the ring cutting position, and position the assembling head at the ring cutting position for assembling the work W at the uppermost stage. To do. The tip of the tubular support tool whose diameter is reduced by lowering the assembling head is put inside the ring, and the tubular support tool is expanded to hold the expanded ring. Next, the assembling head is moved to the position where the second ring is cut out, and the second ring is held on the lower surface of the ring held by the tubular support in a state of being stacked in two stages. Similarly, the required number of rings is held by the tubular support.

Next, position the assembling head at the assembling position, lower it until the lower end of the tubular support is at the same position as the upper side of the groove on the bottom of the work, and lower the ring extrusion by the thickness of the ring. Is extruded and mounted in the ring groove.

To determine if the ring is installed in the ring groove,
If the ring is mounted in the ring groove when the assembling head is further lowered, the work is pushed down against the spring of the work cradle to turn on the switch, but the work is not mounted in the ring groove. When fitted on the outer circumference, the ring simply slides on the outer circumference of the work and the switch is not turned on. Therefore, the quality of the assembly can be determined by the presence or absence of a signal from the switch.

Next, the assembly head holding the second ring is raised from the lower stage to the position above the second ring groove, and the ring extrusion is lowered at that position to mount the ring. After that, the quality of the assembly is judged in the same manner as for the bottom ring, and the bottom ring is assembled.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partial sectional view of a piston ring assembling portion, and FIGS. 2 and 3 are a plan view and a front view of the entire piston ring assembling apparatus, respectively.

As for the overall arrangement of the piston ring assembling device, the assembling head 10 of the piston ring assembling machine 1 has the assembling position 33 shown by a broken line in FIG. 2 and a large number of piston ring cutting machines 20 _{1 to} 20 _N arranged in parallel. It is arranged so that it can be moved along the guide 6 between the ring cutting positions 25 _{1 to} 25 _{N of the} ring cutting portion 2 and can be positioned at multiple points in the vertical direction. An indexing table 30 provided with four piston receivers 31 for respectively supporting the pistons is rotatably arranged at an assembling position 33, and the pistons with the rings attached to the side thereof are transferred to the conveyor 5. An unloader 4 is provided.

First, the ring cutout portion 2 will be described.

As shown in FIG. 4, each ring cutting machine 20 accommodates a large number of rings R stacked in a cylindrical ring magazine 21 by aligning the cuts of the rings of the respective magazines by a gap control guide 22, and the lower side thereof. A cutting plate 23 having an annular groove 24 in which one ring is inserted is installed so as to reciprocate in the horizontal direction. Various types of piston ring cutting machines 20 can be used for various pistons. Ring cutting machine 20 ₁ with magazines 21 _{1 to} 21 _N each containing each ring
~ 20 _N are collocated.

When the cutting plate 23 is at the position shown in FIG. 4 (C),
When the ring R falls under its own weight into the annular groove 24 and the cutout plate 23 moves in the direction of the arrow in the figure, one ring R becomes the second
It is moved to the ring cutting position 25 in the figure.

Next, the ring R is expanded and held from the cutting plate 23 moved to the ring cutting position, moved to the mounting position of the indexing table 30, and a plurality of rings are mounted to the positioned piston W. A ring mounting head. Will be described.

As shown in FIG. 1, a cylinder for expanding and contracting a collet 17 for expanding and retaining the ring in the center of the ring assembling head 10 which is vertically moved and positioned by the piston ring assembling machine 1. 12 is installed, and the ring pusher 18 driven by the multi-point stop actuator 11 is installed on the outer periphery of the collet 17.
Is installed so as to be slidable in the vertical direction with respect to the collet 17, and a cone-shaped actuator 14 is attached to the lower end of the plunger 13 of the cylinder 12.
And a piston pressing rod (15) loaded with a spring (16) is provided so as to penetrate through the central part thereof.

The collet 17 is configured such that a cylindrical body provided with an inclined projection on the lower side of the inner surface of the cylinder is divided into, for example, six pieces in the axial direction, and these divided bodies are connected to each other so that the tip end portion is elastically reduced in diameter. The ring R is held on the outer periphery of the tip end of the collet 17, and when the actuating body 14 is in contact with the upper part of the inner inclined portion of the collet 17, as shown in FIG.
The diameter of the ring 17 is expanded and the ring R is expanded and held at the tip of the outer periphery thereof.

Next, the operation of assembling the ring will be described.

In FIG. 2, a set of four pistons is set one by one in the piston receiver 31 of the indexing table 30, and the apparatus is started. When the indexing table 30 rotates in the direction of the arrow in the figure and the piston W of the top piston receiver 31 passes through the model discriminator 32, the model of the work W is read and the ring to be set is designated, The work W is positioned at the assembling position 33 and the indexing table 30 stops.

In response to a command from the model discriminator 32, a plurality of ring cutting machines 20 corresponding to the model are operated, and a plurality of cutting plates 23 hold one ring R in each of the annular grooves 24 and a ring cutting position. Move to 25. The assembling head 10 is moved to and positioned at the cutting position 25 ₁ of the ring R ₁ to be assembled on the uppermost stage of the work W.

The actuator of the ring assembling machine 1 is activated to lower the assembling head 10. In this case, as shown in FIG. 5, since the plunger 13 is lowered and the actuating body 14 is located on the inclined surface below the collet 17, the collet 17 is reduced in diameter by its own elasticity and its tip is cut out. It enters inside the ring R ₁ held in the annular groove 24 of the plate 23 and descends to the same surface as the lower surface of the ring R ₁ . In this state, when the cylinder 12 is operated and the plunger 13 is raised, the collet
The ring R ₁ is expanded and held by the outer periphery of the tip of the collet 17 by pushing the ring 17 apart.

Next, the assembling head 10 is moved up to a position where the ring R ₂ to be mounted in the second ring groove from the top of the work W is cut out.
Up to 25 ₂ , move the assembling head 10 along the guide 6, and lower it until just before the lower surface of the ring R ₁ held by the collet 17 comes into contact with the upper surface of the cut ring R ₂ , and collet the collet 17.
Reduce the diameter of 17. Ring R held by Collet 17
₁ drops onto the upper surface of the ring R _{2 and} is in a state of being stacked in two stages. When the collet 17 is further lowered to reach the same position as the lower surface of the ring R ₂ , the actuating body 14 is raised by the cylinder 12 to expand the diameter of the collet 17 and hold the _two rings R ₁ and R ₂ . Similarly, the collet 17 holds the rings of the type and number required for the work W. In FIG. 4 (A), when the cutting plate 23 of the ring cutting machine 20 is at the cutting position, the shape of the tip of the collet 17 of the assembling head 10 that opens and closes at that position is shown by a solid line (diameter expansion) and a broken line. (Reduced diameter).

The plurality of rings held by the collet 17 are regulated by the joint regulation guide 22 of each ring magazine 21.

Next, the assembling head 10 is moved to the assembling position 33 shown in FIG. 2 and positioned, and the assembling head 10 holding a plurality of rings on the outer periphery of the tip of the collet 17 is lowered, and the lower end of the collet 17 moves to the sixth position.
As shown in FIG. 6A, the work W is stopped when it reaches the same position as the upper side of the lowermost groove S ₂ (FIG. 6 and subsequent drawings show two rings for simplification of the drawing). ). As the assembling head 10 descends, the piston pressing rod 15 contacts the top of the work W as shown in FIG.
Is compressed and the lower surface of the work W is brought into close contact with the upper surface of the work cradle 34 by its elasticity, and the inclination and lift of the work W are corrected (see FIG. 7 (A)).

Then, when lowering the ring extrusion 18 by operating the multi-point stop actuator 11 mounted on the assembly head 10 by the thickness of the ring R ₂ incorporated in the lower, the ring R ₂ is a collet
Extruded from 17, the ring R ₂ is fitted into the ring groove R _{2 by} its own elasticity as shown in FIG. 6 (B).

As shown in FIG. 7, the piston holder 31 has a work holder
34 is supported by the spring 35, the work holder 34 is movable in the vertical direction, and the switch 36 is installed below the assembling position 33 of the indexing table 30. When the ring 10 is lowered, as shown in FIG. 8 (A), when the ring R ₂ is mounted in the ring groove, the work W is pushed down against the spring 35 of the work support 34, and the switch 36 is pressed. Is turned on, but when it is fitted to the outer periphery of the work W without being mounted in the ring groove like the ring R ₂ shown in FIG. 8 (B),
Since the spring 35 of the work support 34 is set strongly, the ring
The switch 36 is not turned on only because R ₂ slides on the outer periphery of the work W. Whether or not the assembly is good can be determined by the presence or absence of the signal from the switch 36.

Next, the collet 17 holding the ring R ₁ is raised to a position above the second ring groove from the lower stage, and the ring pusher 18 is lowered at that position to mount the ring R ₁ . Thereafter, the quality of the assembly is judged in the same manner as for the ring R ₂ on the lowermost stage, and the ring on the uppermost stage is assembled.

When it is determined that the predetermined number of rings are assembled properly, the assembly of one work W is completed. The unloader 4 revolves and the work conveyor W conveys one work W that has been assembled.
Move to.

The indexing table 30 is rotated one step to position the next work W at the assembling position 33, the assembling head 10 is moved to the ring cutting portion 2 side, and the ring cutting is performed similarly to the first work W. The type and number of rings cut out by the projecting unit 2 are held in the collet 17, and the rings are set in the same manner as the first work W. The process is repeated until the rings are set on the four works.

When the work of the next set is set in the piston receiver 31 and the device is activated, when the head piston of the set passes the model discriminator 32, the model of the work W is read and the ring to be set is specified. , And the rings are sequentially installed in the same manner as the pistons of the previous set.

In the above-mentioned embodiment, the assembly of the piston ring has been described, but it can be applied to the assembly of the O-ring and the C-shaped retaining ring.

〔The invention's effect〕

According to the present invention, one ring assembly head is moved to expand a plurality of different types of rings at the cutting position and the pistons are sequentially mounted at the assembly position. It can be mounted, and the ring is expanded just before assembly, so deformation of the ring is reduced. Also,
Since the assembling can be performed while judging the quality of the ring assembling, there is an effect that the assembling failure can be prevented.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a ring assembling portion, FIGS. 2 and 3 are a plan view and a front view of the entire ring assembling apparatus, respectively.
The drawing shows a ring cutting machine, FIG. 4 (A) is a plan view, FIG. 4 (B) is a partially sectional front view, FIG. 4 (C) is a partially enlarged sectional view, and FIG. Is a sectional view of the ring holding portion, FIGS. 6 (A) and 6 (B) are sectional views when set, FIG. 7 (A) is a sectional view of the piston receiver, and FIG. 7 (B) is an assembly pass / fail judgment. 8A and 8B are enlarged cross-sectional views showing the quality of assembly. 1: Piston ring assembly machine 2: Ring cutting part, 3: Indexing part 4: Unloader, 5: Conveyor conveyor 6: Guide, 10: Assembly head 11: Multi-point stop actuator 12: Cylinder, 13: Plan Jar 14: Actuator, 15: Piston presser rod 16: Guide, 17: Collet 18: Ring extrusion, 20: Ring cutting machine 21: Ring magazine, 22: Abutment regulation guide 23: Cutting plate, 24: Annular groove 30: Indexing table, 31: Piston receiver 32: Model discriminator, 33: Assembly position 34: Work rest, 35: Spring 36: Switch

Claims (2)

[Claims] 1. A ring cutting section having a plurality of ring cutting machines juxtaposed to cut one ring from a magazine, an indexing section for moving a piston receiver supporting a piston to a ring assembly position, and a link. It consists of an assembly head that can be moved between the cut out position and the ring assembly position and can be positioned at multiple points in the vertical direction. A cylindrical support tool for expanding and holding a plurality of rings on its outer circumference, a ring pusher slidably fitted on the outer circumference of the support tool, and moving the ring pusher back and forth to a multipoint position in the axial direction. Piston ring assembly device with drive mechanism. 2. A piston pedestal in which a spring is loaded on a piston receiver is movably installed toward a switch, and a ring pushed by a ring pusher to a mounting position of a piston groove is further pushed beyond the position to further push the ring pusher. The piston ring assembling device according to claim 1, wherein the piston ring assembling device is configured to be extruded.