JPS63174832A - Automatic built-in device for piston ring of piston - Google Patents

Abstract

PURPOSE:To automatically build a piston ring in a groove accurately and speedily, by fitting a piston in a piston fitting recess of a ring magazine, and controlling the feed of piston rings being held and stacked in pile so minutely with a feed mechanism. CONSTITUTION:When a piston P is fitted in a piston fitting recess 40 of a ring magazine 16 in an inverted endwise state, a feed mechanism Fe operates, giving feed motion to each piston ring held and stacked in pile in the ring magazine 16. And, the feed is minutely controlled by a feed control mechanism Fc, whereby the piston ring can be automatically built in a piston ring groove accurately and speedily. And, with only replacing the ring magazine 16, it is able to correspond to the built-in of the piston ring to another piston different in size, so that it is excellent in universality and, what is more, built-in cost for the piston ring is sharply abatable.

Description

Detailed Description of the Invention A0 Objective of the Invention +11 Industrial Field of Application The present invention is directed to a piston ring groove (compression ring groove, oil ring groove) of a piston for a reciprocating internal combustion engine, etc. ) for automatically assembling piston rings.

(2) Conventional technology The piston ring groove (compression ring groove and oil ring groove) of a conventional piston is
In order to assemble the compression ring and oil ring, the piston ring's abutment part was widened with fingers and then manually fitted into the piston ring groove. However, this process requires skill, is time consuming, and is expensive.

In order to solve this problem, an automatic assembling device was proposed that automatically assembles the piston ring into the piston ring groove (see Japanese Patent Publication No. 50-35718).
.

(3) Problems to be Solved by the Invention However, in the method disclosed in the above publication, (1) there is no position detection means for a large number of laminated piston rings; For accurate alignment with the piston ring groove of the piston (
This not only increases unnecessary operation of the device but also makes it difficult to automatically assemble the piston accurately and quickly.

- Since the feed rate of the piston ring is constant, a separate piston ring assembly device is required for each piston of different size, which increases the cost I.

There were other problems.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an automatic piston ring assembling device for a piston that can accurately, quickly, and smoothly assemble a piston ring into a piston ring groove of a piston. It is something to do.

B0 Structure of the Invention (1) Means for Solving Problems In order to achieve the above object, the present invention provides a machine frame, a ring magazine that is supported by the machine frame and holds a large number of piston rings stacked on the outer periphery, and the rings. a piston fitting recess provided at the top of the magazine and fitting and supporting the piston so that the upward surface of the piston ring groove of the piston is flush with the top surface of the ring magazine;
a detection device that senses that a piston is fitted into the piston fitting recess; a piston ring feeding mechanism that is disposed under the ring magazine and is started and controlled by the detection device and feeds the plurality of piston rings upward; , a feed control device capable of detecting when the upper surface of the uppermost piston ring among the plurality of piston rings coincides with the upper edge of the ring magazine and controlling the feeding of the piston ring by the piston ring feeding mechanism; It becomes more.

(2) Function When the piston is fitted into the piston fitting recess of the ring magazine in an inverted state, the feeding mechanism is activated, feeding is applied to the piston rings stacked and held in the ring magazine, and the feeding mechanism is activated. is finely controlled by a feed control device, and the piston ring is automatically and precisely and quickly installed into the piston ring groove.

(3) Example Hereinafter, an example of the apparatus 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 periphery of the head of a piston P for internal combustion engines, among which two piston ring grooves 1.2 on the upper surface side of the piston P are formed. , a piston ring, that is, a compression ring RC1iRC2, are fitted into each of the remaining piston ring grooves 3, and a piston ring, that is, an oil ring Ro is fitted into the remaining piston ring groove 3. The compression rings RC1, RC2 and the oil ring Ro can be automatically fitted into the piston ring grooves 1, 2 and 3, respectively, by the automatic piston ring fitting device of the present invention.

The automatic fitting device for the oil ring Ro will be described in detail below.

As shown in FIG. 1, the oil ring Ro consists of a pair of upper and lower site rail rings 4 and 5, and a spacer ring 6 sandwiched between these rings 4 and 5, which have a known structure. Be prepared. When the oil ring Ro is fitted into the oil ring groove 3 as shown in FIG. ,5. and 6. (Figs. 1 and 2) are shifted in phase at approximately equal intervals in the same direction.

In this embodiment, the oil ring Ro is placed in the oil ring groove 3.
To fit the spacer ring 6, first, the spacer ring 6 is fitted into the oil ring groove 3 as shown in FIG. 5(A). Then the fifth
As shown in FIG. 5(B), the upper sight rail ring 4 is fitted into the oil ring groove 3, and further, the lower sight rail ring 5 is fitted into the groove 3 as shown in FIG. 5(C).

As shown in Fig. 6.7, the machine frame 7 includes an oil ring fitting device EO for fitting an oil ring Ro, that is, a spacer ring 6, an upper site rail ring 4, and a lower site rail ring 5 into the piston P in order. provided. That is, the fitting unit 8 of the spacer ring 6 is placed in the center of the machine frame 7, and the above-mentioned upper,
Lower sight rail ring 4.5 fitting unit 9. IO
are arranged side by side.

Next, the structure of the fitting unit 8 of the spacer ring 6 will be explained with reference to FIGS. 6 to 12. In FIGS. 7 to 11, a fixed outer cylinder 11 is supported substantially vertically on the machine frame 7, A movable inner cylinder 12 is fitted into the fixed outer cylinder 11 so as to be slidable up and down.

Bottom wall 11 of fixed outer cylinder 11. A ball screw rod 13 is rotatably supported. This ball screw rod 13 is screwed into the bottom wall 121 of the movable inner cylinder 12 and extends substantially vertically within the movable inner cylinder 12. The lower end of the ball screw rod 13 is connected to a servo motor 15 supported by the machine frame 7 via a reduction gear mechanism 14.
connected to.

A ring magazine 16 is removably attached to the fixed outer cylinder 11 via a lock block 17. The lock block 17 is fixed to the upper part of the fixed outer cylinder 11,
A locking mechanism for locking the ring magazine 16 is built therein. The lock block 17 of this locking mechanism includes a flange portion 18 (FIG. 9) fixed to the upper surface of the fixed outer cylinder 11, and a flange portion 18 that extends downward from the flange portion 18 and is inserted into the movable inner cylinder 12. It consists of a cylinder portion 19 and a support portion 20 that protrudes from the flange portion 18 in the l1 direction, into which the ring magazine 16 is inserted and supported.

The flange portion 18 is formed into a single-letter shape in plan view as shown in an enlarged view in FIG. The holes 21.21 are engaged, and the movable inner cylinder 12 is moved without rotation to the neck part 181.18 of said flange part 18.
．． It is designed to be able to slide up and down guided by. Therefore, when the servo motor 15 is rotated in the forward or reverse direction, the movable inner cylinder 12 can move up and down relative to the fixed outer cylinder 11 through the lock block 17 via the reduction gear afm14 and the ball screw rod 13. A buffer member 22 made of rubber material is provided at the lower end of the cylinder portion 19 of the lock block 17.
is fixed.

The servo motor 15, reduction gear mechanism 14, and ball screw rod 13 constitute a feeding mechanism Fe for the spacer ring 6.

As shown in Fig. 7.8, a rod 24 is inserted into the lock block 17 so as to be slidable up and down.
4 has a cylinder hole 2 formed in the cylinder part 19.
A piston 26, which is slidably engaged with the piston 5, is fixed. Air passages 29 and 30 formed in the lock block 17 are connected to the upper chamber 27 and the lower chamber 2 of the cylinder hole 25, respectively, and pressurized air is supplied to the air passage 29 from an air circuit (not shown).
By selectively supplying and discharging the upper and lower chambers 27 and 28 through the angle 30, the piston 26 can be controlled to slide up and down together with the rod 24. Said rod 2
A taper pin 31 is integrally formed on the upper end of the lock block 17, and a plurality of lock pins 32 are provided on the support portion 20 of the lock block 17 so as to be freely retractable in the radial direction.
The base ends of the lock pins 32 are engaged with each other, and the plurality of lock pins 32 can be made to protrude and retract from the outer peripheral surface of the support portion 20 by vertically sliding the rod 24 .

In FIG. 7.8, the ring magazine 16 is composed of a hollow cylindrical ring guide part 33 and a piston support part 34 fixed on the ring guide part 33. The ring guide part 33 is removably inserted into the support part 20 of the lock block 17 and supported on the flange part 18 thereof, and the plurality of lock pins 32 are provided on the inner peripheral surface of the ring guide part 33. The locking grooves 36 are formed in correspondence with the locking grooves 36, and the locking pins 32 are made to protrude as described above.
By engaging with the ring magazine 16, the ring magazine 16 can be fixedly supported on the lock block 17.

A push-up ring 35 fixed to the upper end of the movable inner cylinder 12 is slidably fitted to the lower outer periphery of the ring guide portion 33 of the ring magazine 16, and the ring guide of the ring magazine 16 is fitted above the push-up ring 35. A ring holder 38 of the spacer ring 6 is fitted onto the outer periphery of the portion 33 so as to be slidable up and down via a click stop mechanism 37, and the ring guide portion 33 is fitted onto the ring holder 38 in a stacked manner. A large number of spacer rings 6 are stacked and held. As will be described later, when the movable inner cylinder 12 rises, the ring holder 38 is pushed up by the push-up ring 35 at its upper end.
is pushed up by releasing the click stop mechanism 37.

7th. As shown in FIG. 1O, an abutment alignment guide 39 is fixed in the axial direction to the outer peripheral surface of the ring guide portion 33 (left side in FIGS. 7 and 10), and the guide 39 is attached to the ring holder 38. A large number of spacer rings 6 held in a layered manner
6. ... are engaged, and their abutments 61 ... of these spacer rings 6 ... are aligned in the axial direction. Also, the piston support portion 3 of the ring magazine 16
4 is formed with a piston fitting recess 40 for fitting and supporting the piston P in an inverted state, and this fitting recess 40
The depth H+ is such that when the piston P is fitted in an inverted state as clearly shown in FIG.
It is set to match I.

Further, as shown in FIG. 7.11, a dowel guide 41 is fixed to the outer circumferential surface of the piston support part 34 in an extension of the abutment alignment guide 39.
1 is formed with a guide groove 42, and the guide groove 42 guides the abutment 61 of the spacer ring 6, which has been guided by the abutment alignment guide 39, to be fitted into the oil ring groove 3 of the piston P. dedicated to

The support portion 20 of the lock block 17 is provided with a detection device 43 for detecting that the piston P is fitted into the piston fitting recess 40.

That is, as shown in Fig. 7.8, a detection block 44 is fixed to the upper surface of the support part 20 of the lock block 17, and a detection rod 45 is inserted into the detection block 44 so as to be slidable up and down. Spring 46 provided within block 44
It is urged to protrude upward by the elastic force of.

An adjustment screw 47 is screwed onto the upper end of the detection rod 45,
The adjusting screw 47 projects into the piston fitting recess 40 .

The lower end of the detection rod 45 corresponds to a fiber-type photoelectric switch 49 that is exposed in a notch 48 formed in the middle of the support section 20 and provided on the support section 20.
9 can be activated.

7.8, when the piston P is fitted into the piston fitting recess 40 in an inverted state, the detection rod 45 is lowered against the elastic force of the spring 46, and this The switch 49 is actuated, and its actuation signal can start and control the servo motor 15 via the sequencer 50 and the servo motor control unit 51.

In FIG. 7, on one side of the machine frame 7 (the left side in FIG. 7), an upper limit switch 52, an intermediate limit switch 53, and a lower limit switch 54 are spaced apart in the vertical direction.
A dog 55 is provided on one side of the movable inner cylinder 12.
is fixed, and this dog 55 connects the three limit switches 52, 5 through a window hole 56 bored in the fixed outer cylinder 11.
3 and 54, and as the movable inner cylinder 12 moves up and down, the dog 55 selectively operates the limit switches 52, 53 and 54 to move the movable inner cylinder 12 to the upper limit position,
Stop at the original position and lower limit position.

As shown in FIG. 6.7.12, a support 57 is erected on one side of the ring magazine 16 on the machine frame 7,
A substantially horizontal pedestal 58 is supported at the upper end of this support 57, and a feed control mechanism Fc for the spacer rings 6 is provided on this pedestal 58. A pair of guide rails 6 are mounted on the pedestal 58.
0 is laid, and the control frame 6 is placed on this guide rail 60.
1 is provided so as to be able to reciprocate and move forward and backward relative to the fitting unit 8 of the spacer ring 6. control frame 61
A detection arm 62 is pivotally supported 63 via a pole bearing so as to be able to swing up and down. As clearly shown in FIG. 12, a control frame 61 is provided on the upper surface of the proximal end of the detection arm 62.
A terminal of a magnet scale 64 supported by the sensor can be contacted, and a measurement terminal 65 is provided at the tip of the detection arm 62. The control frame 61 is also provided with an adjustable stopper 66, and the lower end of this stopper 66 faces the upper surface of the detection arm 62 on the proximal side of the pivot point 63. 7. In Figure 12, rotation of the detection arm 620 in the counterclockwise direction is restricted. Additionally, a tension spring 6 is connected between the tip of the detection arm 62 and the control frame 61.
7 are connected to each other, and the tensile force of this tension spring 67 causes the detection arm 62 to abut against the stop 7 paper 66.
When the detection arm 62 is in the detection position (FIG. 12(A)), the measurement terminal 65 of the detection arm 62 is connected to one of the many spacer rings 6 stacked in the ring magazine 16. Top spacer ring 6u
The position of the spacer ring 6u is detected by the magnetic scale 64. The signal detected by the Magnescale 64 is input to the servo motor control unit 51 via the Magnescale digital display unit 68 and the sequencer 50, as shown in FIG.
The output signal from the servo motor 15 is applied to the control section of the servo motor 15 to control the rotation of the servo motor 15.

As shown in FIG.
A stopper 70 that is operated up and down by 9 is fixed,
The stopper 70 engages the control frame 61 and locks the control frame 61 in the forward position (FIG. 6.7).

Next, mainly Fig. 7, Fig. 12 (A), (B) and (C)
The process of assembling the spacer ring 6 into the oil ring groove 3 of the piston P will be explained with reference to FIG.

■ The ring magazine 16 has a large number of spacer rings 6.
. . are stacked and held in a stacked manner, and then the piston P is fitted in the piston fitting recess 4'0 of the ring magazine 16 in an inverted state, as shown in FIG. 12(A). Then detection rod 4
5 is pushed down and the fiber type photoelectric switch 49 turns ON.
, a start signal from the switch 49 is applied to the servo motor 15 via the sequencer 50 and the servo motor control unit 51, and the motor 15 is started.

As a result, the ball screw rod 13 rotates and the movable inner cylinder 12 rises, and the push-up ring 35 at the upper end of the ring holder 3
8 to release the click stop mechanism 37 and push it up.

■ When the laminated spacer rings 6 rise and the uppermost spacer ring 6u comes into contact with the measurement terminal 65 of the detection arm 62 as shown in FIG. 12(A), the detection arm 62 slightly The Magnescale 64 is actuated by swinging clockwise (FIG. 12(A)), and the output signal from the scale 64 is displayed on the Magnescale digital display unit 6.
B is input to the servo motor 15 via the sequencer 50 and the servo motor control unit 51, and the rotation of the servo motor 15 is controlled to decelerate and the spacer ring 6.
... to control small feed.

■ The uppermost spacer ring 6u is moved from Fig. 12 (A) to Fig. 12 (B) by small feeding of the spacer ring 6...
), the detection arm 62 is slowly swung clockwise, and during this time, the magnescale 64 is operated to control the rotation of the servo motor 15 to further decelerate, thereby causing the spacer ring 6 to feed. Make it even smaller.

(2) When the uppermost spacer ring 6u protrudes from the upper edge of the ring magazine 16 as shown in FIG. 12(B), the spacer ring 6u is ), the oil ring is fitted into the oil ring groove 3 by its own contraction force.

By using the Magnescale 64, the precise rotational control 4 of the servo motor 15 for controlling the feed of the spacer ring 6 in the above process is transmitted to the servo motor via the sequencer 50. This is done accurately by sending the information to the control unit 51.

By repeating the above steps ■～■, ring magazine 1 will be created.
A large number of spacer rings 6 held in a layered manner on 6...
are sequentially fitted into the oil ring groove 3 of the piston P.

When replacing the ring magazine 16 in order to fit the spacer ring 6 into a piston P of a different size, after releasing the spacing 70, move the control frame 61 on the pedestal 58 along the guide rail 60. After retreating, lock block I
Supplying pressurized air to the upper chamber 27 of the cylinder hole 25 of No. 7,
When the air in the lower chamber 28 is removed, the piston 26 descends together with the rod 24, and the lock bin 32 is removed from the locking groove 36, allowing the ring magazine 16 to be extracted from the support portion 20 of the lock block 17 and replaced with another ring magazine. can.

The piston P in which the spacer ring 6 is installed in the oil ring groove 3 as shown in FIG. 5(A) as described above is as follows.
Fitting unit 9 of upper sight rail ring 4 (Fig. 6)
The upper sight rail ring 4 is assembled into the oil ring groove 3 as shown in FIG. As shown in FIG. 5(C), the lower site rail ring 5 is fitted into the oil ring rR3.

13 to 16 show the specific structure of the unit 9 for fitting the upper sight rail ring 4 into the oil ring groove 3. These fitting units 9 are connected to the ring magazine 11.
6, there is only a slight difference in the configuration, and the other configurations are the same as the fitting unit 8 of the spacer ring 6 described in detail earlier, so a detailed explanation will be omitted. However, the fitting unit 8 of the upper sight rail ring 4 In the fitting unit 9, the same members as those of the fitting unit 8 of the spacer ring 6 are indicated by the same reference numerals with a dash "'" added thereto.

By the way, the piston support part 134 of the ring magazine 116 of the fitting unit 9 of the upper sight rail ring 4 is the 14th
As clearly shown in the figure, the lower half of the ring magazine 116 is formed into a conical surface that gradually expands upward.
A large number of upper site rail rings 4 supported in a stacked manner
... is given an upward feed and reaches the piston support part 134, it is gradually expanded by its outer peripheral surface, and the uppermost site rail ring 4u is the oil ring of the piston P as shown in FIG. 5(B). It is incorporated in the groove 3 above the spacer ring 6.

The two-part sight rail ring 4 is assembled into the oil ring groove 3 by the same process as the spacer ring 6 described above, but its assembly will be explained with reference to FIGS. 13, 17 (8), (B) and (C). Briefly explain the loading process.

(2) After a large number of upper site rail rings 4 are stacked and held in the ring magazine 116, the piston P is fitted into the piston fitting recess 140 of the ring magazine 11G in an inverted state. As a result, the detection rod 45' is pushed down, and the fiber-type photoelectric switch 49' is turned ON.
A starting signal from 9' is applied to the servo motor 15' via the sequencer 50' and the servo motor control unit 51', and the motor 15' is started. As a result, the ball screw rod 13' rotates and the movable inner cylinder 12' rises, and the push-up ring 35' at the upper end of the movable inner cylinder 12'
8' to release the click stop mechanism 37' and push it up.

■ Laminated upper sight rail ring 4... is on top.

Then, the uppermost site rail ring 4u is connected to the measurement terminal 65' of the detection arm 62' as shown in FIG. 17(A).
When the detection arm 62' comes into contact with the magnet scale 6, the detection arm 62' swings slightly counterclockwise (FIG. 17(A)) and the detection arm 62'
4' is activated, and the signal from the scale 64' is transmitted to the Magnescale digital display unit 68' and the sequencer 50.
' and is input to the servo motor 15' via the servo motor control unit 51', and the servo motor 1
5' rotation is controlled to decelerate the upper sight rail ring 4.
... is controlled by minute feed.

The minute feed of the upper sight rail ring 4...
In the process of the L stage upper sight rail ring 4u rising from FIG. 17 (8) to FIG. 17 (B), the detection arm 62
is slowly swung counterclockwise, and during this time, the magnescale 64' is operated to control the rotation of the servo motor 15' to further decelerate, thereby making the feed of the upper sight rail ring 4 even more minute.

(2) Then, as shown in FIG. 17(B), when the uppermost sight rail ring 4u protrudes from the upper edge of the piston support portion 134 of the ring magazine 116, the ring 4u
is incorporated into the oil ring groove 3 by its own contraction force as shown in FIG. 13(C) (FIG. 5(B)).

A large number of upper parts are held in a stacked manner in the ring magazine 116 by repeating the above operations (■ to ■).

The site rail rings 4... are sequentially assembled into the oil ring groove 3 of the piston P.

After the upper sight rail ring 4 has been assembled into the oil ring groove 3 as shown in FIG. 5(B),
As shown in C), a lower sight rail ring 5 is incorporated into the oil ring 11 and 3 below the spacer ring 6.

So, is the lower sight rail ring 5 an oil ring? lt
The fitting unit 10 (Fig. 6) for fitting into the upper sight rail ring 4 has exactly the same configuration as the fitting unit 9 (Figs. 6, 13 to 16) of the upper sight rail ring 4, so a detailed explanation thereof will be omitted. .

In the above embodiment, the spacer ring 6 is
The case where the oil ring Ro consisting of upper and lower sight rail rings 4.5 is automatically assembled into the oil ring groove 3 of the piston P has been described. Of course, RCI and RC2 can be automatically incorporated.

C1 Effects of the Invention As described above, according to the present invention, the piston ring of the piston? * Piston rings (compression rings, oil rings) can be automatically and quickly and precisely assembled into (compression ring grooves, oil ring grooves).

In addition, the piston ring can be installed in another piston with a different size simply by exchanging the ring magazine, and the piston ring installation cost can be greatly reduced due to its excellent versatility.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, and FIG. 1 is a perspective view of a piston, a compression ring and an oil ring incorporated therein, FIG. 12 is an enlarged perspective view of a part of the compression ring, and FIG. The figure is a partially enlarged vertical sectional view of the piston showing the oil ring installed in the oil ring groove of the piston, Figure 4 is a side view as seen from the ■ line in Figure 3, and Figures 5 (A) and (B). and (C) are partially enlarged vertical cross-sectional views of the piston and ring magazine showing the process of assembling the oil ring into the piston.
) shows the upper sight rail ring installed in the oil ring groove, and FIG. 5(C) shows the lower sight rail ring installed in the oil ring groove. Fig. 6 is an overall plan view of the device of the present invention, Fig. 7 is an enlarged vertical cross-sectional view of the spacer ring fitting unit along the line ■-■ in Fig. 6, and Fig. 8 is an The enlarged vertical cross-sectional view along Fig. 9 is the 7th
Figure 10 is an enlarged cross-sectional view taken along the line X-X in Figure 7.
- An enlarged cross-sectional view along the X cotton, Fig. 11 is Fig. 7xr-
An enlarged cross-sectional view taken along line Enlargement of the inset unit of the upper sight rail ring along the line'#
1 sectional view, FIG. 14 is an enlarged cross-sectional view taken along line XIV-XIV in FIG. 13, FIG. 15 is an enlarged cross-sectional view taken along line xv-xv in FIG. XVI-XV
Cross-sectional view along line I, Figure 17 (8) (B) and (C
) is an assembly process diagram of the upper sight rail ring to the oil ring groove of the piston. 1.2...Combrella silane ring groove as a piston ring groove, 3...Oil ring groove as a piston ring groove, 4...Sight rail ring as a piston ring, 5...As a piston ring Lower site rail ring, 6... Spacer ring as piston ring, 7... Machine frame, 16,116... Ring magazine, 40,140... Piston fitting recess, recess,
49.49'...Fiber type photoelectric switch as a sensing device, Fc, Fc'---feed control mechanism, Fe, Fe'---
Feed A mechanism, P... Piston patent applicant Agent for Honda Motor Co., Ltd.
Patent Attorney Ken OchiaiFigure 11Figure 8Figure 15Figure ηFigure 17

Claims (1)

[Claims] A machine frame (7), a ring magazine (16; 116) supported by the machine frame (7) and holding a large number of piston rings (4; 5; 6) stacked on the outer periphery;
16; 116), and fit the piston (P) so that the upward surface of the piston ring groove (1; 2; 3) of the piston (P) matches the upper surface of the ring magazine (16; The piston fitting recess (40; 1
40), and a detection device (43; provided in the ring magazine (16; 116) for detecting that the piston (P) is fitted into the piston fitting recess (40; 140);
43'), and a piston ring disposed below the ring magazine (16; 116), whose start is controlled by the detection device (43; 43'), and which gives upward feed to the plurality of piston rings (4; 5; 6). Feeding mechanism (Fe; Fe')
The top surface of the topmost piston ring among the large number of piston rings (4; 5; 6) is the ring magazine (1).
6; 116), detect this and
Automatic piston ring assembly of a piston, characterized by comprising a feed control device (Fc; Fc') capable of controlling the feed of the piston rings (4; 5; 6) by the piston ring feeding mechanism (Fe; Fe'). Device.