JPS582020B2 - Automatic spacer ring fitting device for the assembled oil ring on the piston of an internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically fitting a corrugated spacer ring into a piston of an internal combustion engine.

Figure 1 shows an example of a piston and a piston ring fitted into it. 1 is a piston, 2, 3 and 4 are three piston ring fitting grooves formed on its outer periphery, and groove 2 has a top A ring (compression ring) 5 is fitted into the groove 3, a second ring (the same) 6 is fitted into the groove 4, and an oil ring (oil scraper ring) 1 is fitted into the groove 4, respectively.

The oil ring 1 is a spacer whose plate surface is bent into a wave shape along the ring, as shown in the figure, in order to improve its oil scraping function and the ability to collect oil from the piston oil hole 8 (Fig. 3). A ring 72, and an upper side rail ring 71 and a lower side rail ring 7 superimposed on the upper and lower surfaces thereof.
A set of oil rings 1 including three rings 71, 72, and 73 is used.

Reference numeral 721 denotes a small protrusion formed on the ring inner diameter side end of each upward and downward bent wave crest of the spacer ring 72 to protrude from the wave crest, and when the spacer ring 72 is fitted into the oil ring groove 4 of the piston 1, the ring A gap is formed between the upper surface of the ring 72 and the downward surface 41 of the groove 4 and between the lower surface of the ring 72 and the upward surface 42 of the groove 4, into which the upper side rail ring 71 and the lower side rail ring 73 fit, respectively. It serves to receive the inner diameter side surfaces of the rails 71 and 73.

t is the abutment of each piston ring 5, 6, 71, 72, 73.

Conventionally, devices for automatically fitting the top ring 5, second ring 6, and one-piece oil ring into respective corresponding fitting grooves of the piston 1 are known.

However, as for the assembled oil rings 71, 72, 73, since the spacer ring 72 has a special wave shape as shown in the figure, it is difficult to automate the assembly. In the prior art, the assembled oil ring 7 was fitted into the piston manually.

The present invention has developed an automatic device that can always and reliably fit the spacer ring 72 of the assembled oil ring 7 into the oil ring groove 4 of the piston 1, thereby fitting all piston rings into the piston 1. The aim is to make it possible to fully automate the process.

The following will specifically explain the embodiments shown in FIGS. 4 to 7.

That is, the present invention provides (1) an inner cylinder 9 having an inner diameter D1 larger than the outer diameter D of the piston 1, an outer cylinder 10 that is slidably fitted into the inner cylinder 9, and the inner and outer fitting cylinders 9, 10. (2) a spacer ring receiving and holding mechanism A comprising an annular recess 11 that accommodates and holds a wave-shaped spacer ring 72 of an oil ring formed between the outer circumference of the inner cylinder and the inner circumference of the outer cylinder at the end of the spacer ring; a carrier mechanism B that reciprocates the receiving and holding mechanism A between the spacer ring receiving position and the fitting position relative to the piston; (3) spacer ring 72;
A spacer ring magazine 12 in which a large number of spacer rings are fitted and held on the outer periphery is connected to the end of the magazine 12, and the outer diameter gradually increases toward the tip, and the outer diameter D2 at the most extreme point is connected to the spacer ring receiving and holding mechanism. The tapered spacer ring diameter expansion guide member 13, which is larger than the inner diameter D3 of the annular recess 11 by the width dimension d of the spacer ring 72, and the spacer ring 72 of the magazine 12 are sequentially pushed in the direction of the spacer ring diameter expansion guide member 13. and a spacer ring feeding member 14 that pushes and accommodates the spacer ring 72 whose diameter has been enlarged from the tip of the spacer ring diameter expanding guide member 13 into the annular recess 11 of the spacer ring receiving and holding mechanism A. This is an automatic spacer ring fitting device consisting of the above mechanisms A, B, and C, including a spacer ring diameter expanding mechanism C disposed at a spacer ring receiving position.

Explain the operation.

The spacer ring receiving and holding mechanism A is moved to the spacer ring receiving position by the carrier C, and the inner and outer fitting cylinders 9 and 10 of the mechanism A are brought to the upper end position of the tapered spacer ring diameter expansion guide member 13 of the spacer ring diameter expansion mechanism C. When located coaxially, spacer ring feeding member (magazine sleeve) 1
A signal is sent to the push-up mechanism 4 (omitted in the figure, 15 indicates the lift rod), and the entire spacer ring fitted on the outer periphery of the magazine 12 and the spacer ring diameter expansion guide member 13 is moved by one ring pitch (ring (pitch of one piece thickness) is pushed up.

As a result, only one spacer ring 72 at the leading edge of the member 13 is pushed out from the tip of the member 13 into the annular recess 11 of the inner and outer fitting cylinders 9, 10 of the spacer ring receiving and holding mechanism A, and eventually that ring is transferred to the member 13. completely comes off from the tip (dashed line in Figure 5).

The detached uppermost ring then slides on the upper corrugated surface of the next ring without becoming entangled with the next ring due to its own shrinking force, and naturally reduces its diameter in the direction of the inner cylinder 9 and enters the annular recess 11. is held by wrapping around the outer circumference of the inner cylinder 9 (the fifth
solid line).

In this case, the outer diameter D2 of the tip end of the ring diameter expansion guide member 13 is larger than the inner diameter D3 of the annular recess 11, that is, the outer diameter of the inner cylinder 9, by the spacer ring width d, as described above. The outer periphery of the spacer ring 12 held around the outer periphery of the inner cylinder 9 is positioned within the inner diameter of the next ring 72 held at the tip of the member 13, and is completely separated from the next ring 72. The relationship is severed.

Next, the inner and outer fitting cylinders 9, 10 that received and held one ring 72, that is, the ring receiving and holding mechanism A, move the carrier until a certain height position h at which the received and held ring 72 completely comes out of the inner diameter of the next ring 72. After being lifted by the upward movement of carrier B, the ring 72 is conveyed above the piston 1 into which it is to be fitted by the subsequent lateral movement of carrier B (
Figure 4 (dashed line).

Next, at a position above the piston 1, the carrier B moves downward, so that the inner and outer fitting cylinders 9 and 10 descend while holding the ring 72, and the inner cylinder 9 covers the piston 1.

In the process of lowering the inner and outer fitting cylinders 9 and 10, first, the lower end of the piston presser rod 17, which is constantly projected downward in the inner cylinder 9 by a spring 16, hits the top surface of the piston 1, and the piston 1
Press.

The presser rod 17 is free to slide on the inner cylinder 9, and as the inner and outer fitting cylinders 9 and 10 descend, it is pulled into the inner cylinder 9 while gradually increasing the piston pressing force against the spring 16. The subsequent lowering of the inner and outer fitting tubes 9 and 10 is not inhibited.

A ceiling 91 is formed inside the inner cylinder 9, and the distance between the lower end opening surface of the inner cylinder 9 and the ceiling 91 surface, that is, the depth of the inner cylinder 9 is determined in advance so that the distance between the top surface of the piston 1 and the oil ring groove 4 is It is designed to match the dimensions up to the edges.

The inner and outer fitting cylinders 9 and 10 are further lowered and the piston presser rod 17
is retracted to the inner cylinder ceiling 91, and when the inner cylinder ceiling surface 91 hits the top surface of the piston 1, the descent of the inner cylinder 9 is suppressed there. That is, the inner cylinder 9 has its lower edge above the oil ring groove 4 of the piston 1. Although the outer cylinder 10 stops descending when it meets the edge, the outer cylinder 10 continues to lower, pushing the ring 72 wrapped around the outer circumference of the inner cylinder in the annular recess 11 and disengaging it from the inner cylinder 9.

The spacer ring 72 removed from the inner cylinder 9 contracts in diameter due to its own elasticity and fits into the oil ring groove 4 of the piston 1 (FIG. 6).

After the spacer ring 72 has been fitted into the piston 1, the ring holding mechanism A is moved back to the ring receiving position by the carrier B in an operation opposite to that for ring fitting.

Reference numeral 18 indicates a positioning stopper for the carrier B at the mechanism C position, and reference numeral 19 indicates a spring for constantly pushing down the inner cylinder 9, which has a stronger spring force than the spring 16 for pushing down the piston presser bar.

20 indicates a machine base.

As described above, according to the device of the present invention, unlike other piston rings such as the top ring 5, the magazine 1 has a special wave-shaped shape.
2 and the outer periphery of the ring diameter expansion guide member 13, as shown in FIG. and hold it in the oil ring groove 4 of the piston 1.
It can be fitted securely.

Therefore, it is possible to automate the fitting of the assembled oil ring 7, which has conventionally been done manually, and thereby it is possible to automatically fit all the piston rings.

Note that the device of the present invention can be used as it is with other piston rings 5, 6,
It can also be used as an automatic fitting device for 71 and 73.

However, in that case, the distance between the lower end opening surface of each inner cylinder 9 and the ceiling 91 surface, that is, the depth of the inner cylinder 9, is determined depending on the type of target piston ring. The dimensions shall be designed to match the spacing dimensions.

Further, the outer diameter D2 of the ring diameter expansion guide member 13 does not need to be larger than the inner diameter D3 of the annular recess 11 as in the case of the spacer ring 72, and may be designed so that D2=D3.

It is preferable to assemble the assembled oil rings 71, 72, 73 into the groove 4 in the order shown in FIG.

That is, first, the lower side rail 73 is temporarily fitted into the lower part of the oil ring groove 4 of the piston 1 (see Fig. 6a→
b), Next, fit the spacer ring 72 into the oil ring groove 4 (FIG. C), then fit the upper side rail 71 into the oil ring groove 4, and fit the spacer ring 72 into the oil ring groove 4, By pushing up the lower side rail 73 which has been temporarily fitted into the oil ring groove 4 under the spacer ring 72, the lower side rail 73 is pushed up by the push-up member 21.

As a result, the spacer ring 12 is inserted into the oil ring groove 4.
A set of three oil rings 7, with the upper side rail 71 and the lower side rail 73 superimposed above and below the oil ring 7, are fitted together easily, quickly and accurately (see d→e in the figure).

Figure 9 shows the assembled oil ring 7, (71) for the piston 1.
, 72, 73), a plan view of an example of a device that completely automatically fits all piston rings, including the second ring 6 and top ring 5, in which 22 is suspended between two sprockets 23 and 24. 25 is the chain conveyor 2 which is rotated intermittently in the direction of the arrow.
Numerous pallets are attached at equal intervals to 2 and rotate together with the conveyor, 26 and 27 are sliding guide rails for the pallets, 28 is a piston set table placed on each pallet, and the table in the illustrated example is the outer periphery. A circular recess 281 on the upper surface of the set table 28 on the pallet is shown at point A of the circulating rotary conveyor 22.
(FIG. 4) The pistons are set one after another by inserting the base of the piston 1 into the inside.

C1 to C5 are spacer rings, which are mechanisms for expanding the diameter of the lower side rail rings 73 of the assembled oil ring 7, which are sequentially arranged at equal intervals along the rotation path of the conveyor 22 on the side opposite to the piston setting work side. 72, the diameter expanding mechanism of the side rail ring 11, the diameter expanding mechanism of the second ring 6, and the diameter expanding mechanism of the top ring 5. This mechanism is similar to the mechanism shown in Figure 4.

A1 to A5 are ring receiving and holding mechanisms corresponding to each of the ring diameter expanding mechanisms C1 to C5, and each of these mechanisms A1 to A5 is a
The specific structure of A5 is similar to mechanism A in FIGS. 4-6.

Each of the ring receiving and holding mechanisms A1 to A5 is mounted and supported on a common carrier (cross member) B.

The carrier B is freely movable back and forth in parallel along the longitudinal direction guide rods B2 and B2 via the traverser B1, and the movement of the carrier B in the longitudinal direction causes each ring receiving and holding mechanism A1 to A5 to be moved as a whole. Diameter expansion mechanism row C1~
It reciprocates between C5 and the piston row on the conveyor 22.

Further, the carrier B is freely movable in parallel in the vertical direction along vertical guide rods B3, B3.

Thus, the pistons 1 are set one after another on the setting table 28 on the conveyor pallet 25 at the point A of the conveyor 22.
rotates with the intermittent rotation of the conveyor 22, and moves to each ring insertion station position (each ring receiving and holding mechanism A1 to A5
Each time the piston set table positioning member 29 in a bifurcated shape provided at each station position moves in the direction of the set table 28, the set table 28 is pressed against the side surface of the rail 26. Set table 28 on each pallet 2
5 and position it in the correct position.

During this time, each of the ring receiving and holding mechanisms A1 to A5 is positioned on the corresponding ring diameter expanding mechanism C1 to C5 by a carrier B, receives and holds one ring, and is moved by the carrier B in one direction of the piston.

When the carrier B reaches the forward movement end point, that is, when each of the ring receiving and holding mechanisms A1 to A5 is positioned above the piston 1, the carrier B, that is, each of the ring receiving and holding mechanisms A1 to A5 moves downward to fit each ring to the piston. The ring receiving and holding mechanisms A1 to A5 are then moved back toward the mechanisms C1 to C5 by the reverse movement of the carrier B.

That is, the piston 1 conveyed by the intermittent rotating conveyor 22 is placed at each ring fitting station position (lower side rail ring 73, spacer ring 72, upper side rail ring 71).
, the second ring 6 and the top ring 5 (the fitting stations of the second ring 6 and the top ring 5 are sequentially referred to as the first to fifth stations), (1) The lower side rail ring 7 is fed at the first station.
3 is temporarily engaged with the lower outer circumference of the oil ring groove of the piston 1 (corresponding to FIGS. 8a and 8b).

(2) At the second station, the spacer ring 72 is fitted into the oil ring groove 4 (corresponding to C in the figure).

(3) Upper side rail ring 7 at the third station
1 is fitted in the oil ring groove 4 on top of the spacer ring 12 fitted in the groove 4, and
The lower side rail 73, which is temporarily engaged with the lower part of the groove 4, is pushed up in the direction of the groove 4 by the operation of the push-up member 21 and fits into the groove 4 under the spacer ring 72.
The fitting of the assembled oil ring 7 (71, 72, 73) into the assembly is completed (d, e in the figure).

(4) At the fourth station, the second ring 6 is in the groove 3.
fitted against.

(5) At the fifth station, the top ring 5 is fitted into the groove 2.

As described above, all the piston rings, including the set oil ring 7 (73, 72, 71), the second ring 6, and the top ring 5, are transferred to the piston 1 through the first to fifth stations intermittently by the conveyor 22. They are fitted in sequence and fully automatically.

The pistons, which have all the piston rings fitted and have passed through the fifth station one after another, are removed from the piston set table 28 at point B of the conveyor 22, and the pistons are removed from the empty set table 2.
8, a piston to which a new ring is to be fitted is set.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the piston and various piston rings fitted to it, Figure 2 is an enlarged perspective view of a portion of the spacer ring of the assembled oil ring, and Figure 3 is an exploded perspective view of the piston with various piston rings fitted. FIG. 4 is an enlarged sectional view of a portion of the piston, FIG. 4 is a side sectional view of the device of the present invention, FIG. 5 is an enlarged sectional view of a portion of the device in which one spacer ring is received and held, and FIG. 6 is a partial enlarged sectional view of the spacer ring fitted to the piston. Fig. 7 is a partially enlarged side view of the spacer ring in which the corrugated portions are fitted into each other on the outer periphery of the magazine or the ring diameter expansion guide member, and Fig. 8 is the assembled oil ring. An illustration of the fitting process,
FIG. 9 is a plan view of the fully automatic piston ring fitting device. A (A1 to A5) is a ring receiving and holding mechanism, B is a carrier mechanism, and C (C1 to C5) is a ring diameter expanding mechanism.

Claims (1)

[Claims] 1. Inner cylinder 9 with inner diameter D1 larger than outer diameter D of piston 1
, an outer cylinder 10 slidably fitted into the inner cylinder, and a waveform of the assembled oil ring 7 formed between the inner cylinder outer periphery and the outer cylinder inner periphery at the ends of the inner and outer fitting cylinders 9 and 10. A spacer ring receiving and holding mechanism A consisting of an annular recess 11 that accommodates and holds the spacer ring 72; A carrier mechanism B that reciprocates the spacer ring receiving and holding mechanism A between a spacer ring receiving position and a fitting position relative to the piston; a spacer ring 72; A spacer ring magazine 12 in which a large number of spacer rings are fitted and held on the outer periphery is connected to the end of the magazine 12, and the outer diameter gradually increases toward the tip, and the outer diameter D2 at the most extreme point is connected to the spacer ring receiving and holding mechanism. Push the tapered spacer ring diameter expansion guide member 13, which is larger than the inner diameter D3 of the annular recess 11 of A by more than the width dimension d of the spacer ring 12, and the spacer ring 72 of the magazine 12 in the direction of the ring diameter expansion guide member 13. The spacer ring 72 is moved and expanded in diameter from the tip of the spacer ring diameter expansion guide member 13 into the annular recess 11 of the spacer ring receiving and holding mechanism A.
a spacer ring sending member 14 for pushing and housing the spacer ring, and a spacer ring diameter expanding mechanism C disposed at the spacer ring receiving position of the spacer ring receiving and holding mechanism A. Spacer ring automatic fitting device.