JPH084973B2 - Assembly device for piston ring piston ring groove - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Objects of the Invention (1) Field of Industrial Application The present invention relates to a piston ring groove of a piston for a reciprocating internal combustion engine or the like, and particularly to a thin piston ring such as a side rail ring of an assembled oil ring. A device for incorporating a ring.

(2) Conventional Technology A conventional ring magazine for stacking and holding a large number of piston rings in a laminated manner is composed of a cylindrical ring support cylinder and a taper jig continuously provided on the ring support cylinder. The piston ring automatic assembling device in which the piston ring is gradually expanded so that the uppermost piston ring is removed from the taper jig and assembled into the piston ring groove of the piston is already known (special feature: Kosho 50-35
718 public information)).

(3) Problems to be Solved by the Invention However, when a piston ring, particularly an extremely thin ring such as a side rail ring of an assembled oil ring, is assembled in the piston ring groove by using the conventional device, the outer peripheral surface of the ring magazine is Is a perfect circle, the side rail ring is extremely thin, and so on. If the side rail ring 04 is expanded larger than the outer diameter of the piston P'as shown in Figs. , or become uneven without being aligned abutment ₀₄ is the side rail ring 04 is distorted as shown in 9, 10 figures, abutments 4
_The edge of _one end is caught in the ring magazine 012,
The ring 04 works well in the piston ring groove 03 of the piston P '.
There was a problem that it might not be built into.

Therefore, the present invention provides a method for assembling a piston ring into a piston ring groove so that even if the piston ring is extremely thin such as a side rail ring of an assembled oil ring, the piston ring can be reliably and smoothly assembled into the piston ring groove. The purpose is to provide a device.

B. Configuration of the Invention (1) Means for Solving the Problems According to the present invention, a plurality of piston rings are stacked and supported on the outer periphery of the cylindrical ring magazine to achieve the above-mentioned object, and at the top of the ring magazine. The piston is fitted with its head down, the piston ring is controlled to rise along the ring magazine, the uppermost piston ring is projected from the upper edge of the ring magazine, and the piston ring is inserted into the piston ring groove of the piston. In the device for assembling the piston ring into the piston ring groove, the ring magazine is provided with a cylindrical ring support cylinder and a tapered surface having a taper surface which is continuously connected to the upper part of the ring magazine and expands to the outer circumference. And a plurality of piston ring mating openings which are fitted and held in a laminated manner on the outer circumference of the ring support cylinder in a row. An abutment alignment guide for arranging is provided, and the taper jig has a non-true outer peripheral surface capable of forcibly expanding the abutment of the piston ring fitted thereinto outward in the circumferential direction and the radial direction. A circular cut surface is formed in a portion of the outer peripheral surface corresponding to the mating opening, and a gap is formed between the cut surface and both ends of the mating opening of the piston ring.

(2) Operation When the plurality of piston rings stacked and held on the outer periphery of the cylindrical ring magazine are controlled to move upward, the abutment holes of the plurality of piston rings are aligned in a line by the abutment alignment guide, and the taper jig is used. By this, the abutment can be forcibly expanded outward in the circumferential direction and the radial direction, and the piston ring at the uppermost stage can be removed from the taper jig to be reliably, quickly, and smoothly assembled into the piston ring groove.

(3) Example Hereinafter, one example of the device of the present invention will be described with reference to the drawings.

In FIG. 1, three piston ring grooves 1, 2 and 3 are formed on the outer circumference of the head of a piston P for an internal combustion engine or the like, and two piston ring grooves 1, 2 on the upper surface side of the piston P are formed among them. The piston rings, that is, the compression rings RC1 and RC2, are fitted respectively, and the piston ring, that is, the oil ring Ro is fitted in the remaining one piston ring groove 3.

As shown in FIG. 1, the assembled oil ring Ro is composed of a pair of upper and lower side rail rings 4 and 5, and their rings.
It consists of spacer rings 6 sandwiched between 4 and 5, which are of known construction. When assembled oil ring Ro is written fitted in Oriruringu groove 3 as shown in 3 and 4, on the spacer ring 6, the upper and lower side rail rings 4 and 5 are polymerized under their abutment 4 ₁ , 5 ₁ and 6 ₁ (first 1,2
In the figure), the phases are shifted at substantially equal intervals in the same direction.

According to this embodiment, the oil ring is assembled in the oil ring groove 3
To fit Ro, first, the spacer ring 6 is fitted into the oil ring groove 3 as shown in FIG. 4 (A). Next, the lower side rail ring 5 is fitted in the oil ring groove 3 as shown in FIG. 4 (B), and the upper side rail ring 4 is fitted in the ring groove 3 as shown in FIG. 4 (C). Be done.

By the way, the present invention is characterized in that even if the piston ring is an extremely thin ring such as the upper and lower side rail rings 4 and 5 of the above-mentioned oil ring Ro, it can be reliably and smoothly assembled into the piston ring groove. A specific example of an assembling device for assembling the upper side rail ring 4 as the piston ring into the piston ring groove 3 will be described.

In FIGS. 5 and 6, a fixed outer cylinder 8 is fixed to the base 7 substantially vertically, and a movable inner cylinder 9 is vertically slidably fitted in the fixed outer cylinder 8. The movable inner cylinder 9 is connected to a known feed device (not shown), and the feed is controlled upward by the feed device.

The fixed outer cylinder 8 is inserted the lower half of the magazine support member 10, the magazine support member 10 to the flange portion ₈₁ of the fixed outer cylinder 8
Flange 10 ₁ of is fixed by connecting bolts 11. Then, the ring magazine is attached to the upper protruding portion of the magazine support member 10.
12 is detachably supported.

The ring magazine 12 is a hollow cylindrical ring support cylinder 13,
It comprises a taper jig 14 (detailed later) fixed on the ring support cylinder 13. A push-up ring 15 fixed to the upper end of the movable inner cylinder 9 is slidably fitted in the lower part of the outer periphery of the ring support cylinder 13 in a vertically slidable manner.
Above this, a ring receiver 16 is fitted on the outer periphery of the ring support cylinder 13 so as to be vertically slidable.
A click stop mechanism 17 is interposed between the ring support cylinder 16 and the ring support cylinder 13, whereby the ring receiver 16 is locked at the lowest position.

A large number of the side rail rings 4 are fitted to the outer circumference of a cylindrical ring support cylinder 13 in a laminated manner to form the ring receiver 16
Stacked on top. When the movable inner cylinder 9 is feed-controlled by a known feed mechanism, the push-up ring 15 hits the ring receiver 16 and pushes it up against the locking force of the click-stop mechanism 17 to form a large number of laminated layers. The side rail ring 4 can be pushed up and fed.

As shown in FIG. 7, a notch step portion 18 having an L-shaped cross section is formed on one side of the outer peripheral surface of the ring support tube 13, and the corner portion of the notch step portion 18 has substantially the entire length of the ring support tube 13. An abutment alignment guide 19 extending over the entire area is fixed. The gap alignment guide 19 is formed in a flat plate shape and protrudes outward in the radial direction of the ring support cylinder 13, and the gaps 4 _{1 of the} many side rail rings 4 are vertically aligned in a line by the left and right guide surfaces thereof. To be done.

Next, the structure of the taper jig 14 of the ring magazine 12 will be described. The taper jig 14 is fixed to the upper surface of the ring support cylinder 13 by a connecting bolt 20. Taper jig
A piston fitting recess 21 for fitting and supporting the piston P with the head thereof facing downward is formed on the upper surface of 14. Further, the outer peripheral surface of the lower half portion 14 ₁ of the taper jig 14 is formed into a tapered surface 22 which expands upward, and the upper half portion 14 ₂ thereof has the tapered surface 2
It is formed on a vertical plane 23 having a diameter substantially the same as the maximum diameter portion of 2.

As shown in FIGS. 5 and 8, above the abutment alignment guide 19, a flat cut surface 24 is formed on the outer peripheral surface of the taper jig 14 over the upper and lower half portions 14 ₂ , 14 ₁ . The width D of this cut surface 24 is the end of the side rail ring 4.
4 is wider than the _first width d, abutment edge 4 _2, 4 ₃ of the side rail ring 4 is adapted to face the projection plane of the cut surface 24.

The cross-sectional shape of the taper jig 14 is formed in a non-round shape.
That is, as shown in FIG.
The cross-sectional shape of the substantially semicircular portion (the lower half portion in FIG. 8) on the side having the is an ellipse whose major axis is a diameter line l-l passing through the center a of the taper jig 14 and the left-right center b of the cut surface 24. Another semi-circular part formed in a shape and having no cut surface 24 (upper half part in FIG. 8)
Is formed in an arc shape that is substantially the same as the arc of the side rail ring 4 in the normal state. Thus side rail ring 4 to be fitted on the outer peripheral surface of the tapered fixture 14, without its entirety distorted, the abutment 4 ₁ be extended without unreasonable to become not radially outward in the circumferential direction outward only Is possible. Then, both ends 4 ₂ and 4 ₃ of the abutment 4 ₁ can be separated from the cut surface 24 to face it.

Also in the upper edge outer periphery of the half 14 ₂ on the tapered fixture 14, the
As is clear from FIGS. 5 and 6, the spacer ring 4 is shallow, and an annular locking groove 25 that can fit only one sheet is formed. The upper edge of the opening of this locking groove 25 and the taper jig. The distance between the upper half portion 14 _{2 and the} upper end surface of 14 is set to be smaller than the thickness of one side rail ring 4, and the side rail ring 4 that has left / lifted from the groove 25 immediately moves to the piston P. It can move to the oil ring groove 3 side.

Then, in this locking groove 25, the uppermost side rail ring 4
By shallowly fitting only one side rail, the uppermost side rail ring 4 (only one side rail ring 4 to be fitted in the oil ring groove 3 of the piston P next time) is attached to the upper half 14
The upper edge of ₂ can be temporarily fixed and waiting. In such a standby state, the movable inner cylinder 9 is raised so that the number of side rail rings 4 on the outer periphery of the ring magazine 12 is 1 for all.
When ascending feed corresponding to the thickness of one side rail ring 4 is given, in response to this, the uppermost side rail ring 4
Moves away from the locking groove 25 and rises toward the oil ring groove 3 of the piston P, and the side rail ring 4 of the next stage is fitted into the locking groove 25 and temporarily fixed therewith. There is no fear that the two rings 4 will be separated from the taper jig 14 at once in the state where two rings are stacked. In this case, the uppermost side rail ring 4, "shallow" the locking groove 25 is an inner peripheral end of it fitted and it is, elastic expansion have split end 4 ₁ Deformation (that is, elastic deformation in the disengagement direction with respect to the locking groove 25) is relatively easy, and in general, the side rail ring moves up and down at high speed following the piston. The upper and lower edges of the circumference should not damage the mating member.
Since each lower edge is provided with an arm or a chamfer to some extent, the rounded or chamfered portion can be used as a guide surface for overcoming the upper edge of the opening of the locking groove 25. The upper side rail ring 4 can be smoothly disengaged and raised from the locking groove 25 only by pushing up the ring 4.

 Next, the operation of this embodiment will be described.

On the outer periphery of the ring magazine 12, a large number of side rail rings 4 are fitted in a laminated manner and supported on a ring receiver 16, and a piston fitting concave portion 21 of a taper jig 14 has a piston P below its upper surface. And then fitted.

Next, the movable inner cylinder 9 is fed and raised by the operation of a feeding device (not shown), so that the push-up ring 15 overcomes the locking force of the click-stopper mechanism 17 and is raised to raise the ring receiver.
16 is slowly raised, that is, intermittently raised with a slight feed amount corresponding to the thickness of one side rail ring 4. Thus the number of side rail ring 4 is given the same rise and feed ring receiver 16, abutment 4 ₁ of them ring 4 are aligned in a row by abutment alignment guide 19, guided by the right and left guide surfaces Then, it rises smoothly without waving, keeping it substantially horizontal.

Side rail ring 4 which reached the lower half 14 ₁ of the tapered fixture 14 slide into elevated while being gradually expanded by the tapered surface 22. In this process, the uppermost side rail ring is temporarily fixed held on half 14 ₂ of the locking groove 25 in the meantime 4
Is pushed up by the group of side rail rings 4 below and smoothly disengages and rises from the engaging groove 25 (that is, disengages from the taper jig 14) as described above, and is fitted into the oil ring groove 3 of the piston P. However, at that time, the side rail ring 4 of the next stage is locked in the locking groove 25 and temporarily held, so that two thin side rail rings 4 are overlapped from the taper jig 14 at a time. Inconveniences such as disengagement are effectively avoided.

By the way, the taper jig 14 has a special shape whose cross-sectional shape is not a perfect circle as described above, that is, the semicircular portion on the side of the cut surface 24 is formed into an elliptical shape having the diameter line l-l as the major axis. so abutment 4 ₁ side half portion of the side rail ring 4 is spread widely without difficulty and outward circumferential outward and diameter direction by the elliptical, moreover abutment 4 ₁ at both ends 4 _2, 4 ₃
The edges of can be separated from the cut surface 24. As a result, the side rail ring 4 is smoothly distorted without being distorted.
And is fitted into the piston ring groove 3 smoothly, easily and surely.

In addition, in the above-mentioned embodiment, the case where the side rail ring is assembled in the oil ring groove has been described, but it goes without saying that the present invention can be applied to the assembly of the piston ring groove of another piston ring.

C. Effects of the Invention As described above, according to the present invention, a large number of piston rings that are fitted and supported in a stacked manner in a ring magazine are arranged so that the abutments are aligned, and they are extremely smooth sequentially without distorting them.
Can be assembled in the piston ring groove quickly and reliably,
The efficiency of incorporation of the piston ring into the piston ring groove can be significantly improved.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention. FIG. 1 is a perspective view of a piston and a compression ring and an oil ring assembled therein, and FIG. 2 is an oil ring assembled in an oil ring groove of the piston. FIG. 3 is a partially enlarged sectional view of the piston showing a state in which the piston is assembled, FIG. 3 is a side view taken along the line III in FIG. 2, and FIGS. FIG. 4 (A) is a partially enlarged vertical sectional view of the piston and the ring magazine showing the assembling process, FIG. 4 (A) shows the spacer ring in the oil ring groove of the piston, and FIG. 4 (B) shows the upper side rail ring in the oil ring groove. Further, FIG. 4C shows a state in which the lower side rail ring is incorporated in the oil ring groove. FIG. 5 is a side view of the ring magazine as viewed in the direction of arrow V in FIG. 6, and FIG. 6 is a longitudinal sectional view of the ring magazine taken along line VI-VI in FIG.
FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 5, and FIG.
FIG. VIII-VIII line enlarged plan view, FIGS. 9 and 10 show a conventional ring magazine, FIG. 9 is a side view thereof, and FIG. 10 is a plan view thereof. 3 …… Piston ring groove, 4 …… Upper side rail ring, 4 ₁ …… Attachment, 12 …… Ring magazine, 13 …… Ring support tube, 14 …… Taper jig, 19 …… Attachment alignment guide, 22 …… Tapered surface, 24 …… Cut surface

Claims (1)

[Claims] 1. A plurality of piston rings (4) are stacked and supported on the outer circumference of a cylindrical ring magazine (12), and a piston (P) is fitted on the top of the ring magazine (12) with its head down. Then, the piston ring (4) is controlled to rise along the ring magazine (12), the uppermost piston ring (4) is projected from the upper edge of the ring magazine (12), and the piston ring (4) is moved to the piston (P). ) Piston ring (4) which is designed to be installed in the piston ring groove (3)
In the device for assembling the piston ring groove (3), the ring magazine (12) is provided with a cylindrical ring support cylinder (13) and a taper surface (22) that is integrally connected to the upper part of the ring magazine and expands to the outer circumference. be more configuration and taper jig (14) having one row of abutments (4 ₁₎ of the plurality of piston rings which are laminated to the fitting holding therein the outer periphery of the ring support cylinder (13) (4) Alignment guide (1 for aligning
9) is provided, also the tapered fixture (14) is forced to the circumferential direction and radially outward of the abutments (4 ₁₎ of the piston ring (4) to the outer peripheral surface thereof is fitted therein is formed on the non-round shape which can spread, and the outer peripheral surface, the abutment (4 ₁₎ a flat cut surface in a portion corresponding to (24) is formed, the cut surface (24), piston rings ( 4) An assembly device for a piston ring groove of a piston ring, characterized in that a gap is formed between the both ends (4 ₂ , 4 ₃ ) of the abutment (4 ₁ ) of 4).