JPH1110459A - Piston ring supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technique which eliminates a necessity of a monitoring device which monitors defective fitting of a piston ring and a necessity of the fitting correction work. SOLUTION: This a piston ring supply device holds many C-shaped piston rings 4 on an outer peripheral face of a magazine like a vertically placed cylinder in a condition in which they are piled up at steps, pushes down the C-shaped piston ring 4 at a lowermost position by pressing down arms 73, 74 for delivery, and fits it in a ring groove 1c of a piston 1. The pressing down arms 73, 74 are provided with a first pushing down part which pushes down a vicinity 4a of a cut away part of the C-shaped piston ring 4 by the priority over the other parts and a second pushing down part which pushes down the other parts of the C-shaped piston ring 4 in delay to the first pushing down part. The magazine is provided with a stopper 91 against which the C-shaped piston ring 4 bumps when the vicinity 4a of the cut away part N jumps out from a ring groove 1c among the C-shaped piston rings fitted in the ring groove 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a piston ring supply device.

[0002]

2. Description of the Related Art A large number of piston rings in a stacked state
For example, Japanese Patent Application Laid-Open No. 7-2
No. 66151, “Piston ring assembling device” is known. According to FIG. 1, FIG. 2, FIG. 17, and FIG. 18 of the publication, a large number of guide bodies 3 (numbers quoted in the publication; hereinafter the same) are stacked in a stacked state. The piston rings 21 are housed, and the lowermost piston ring 21 is pushed up by the stepping motor 37 so that the uppermost piston ring 21 is pushed out one by one from the upper enlarged-diameter guide member 4, and the ring groove 9 a of the piston 9 is formed. ~ 9c
It fits in. The stepping motor 37 has 1
By a distance corresponding to the thickness t of the two piston rings 21,
The piston rings 21 in a stacked state are pushed up. The piston ring 21 has a C having a cut 21a.
It is a shaped ring.

[0003]

The piston ring 21 fitted into the ring grooves 9a to 9c of the piston 9 generally comprises the following five types of rings. In other words, five types of rings are two compression rings (top ring, second ring)
And a pair of oil rings (including a central expander and upper and lower first and second side rails). Next, a conventional expander supply device will be described with reference to the following figure.

FIGS. 20A to 20E are explanatory views of a conventional expander supply device. The expander supply device (a) stores a large number of expanders (piston rings) 102 in a stacked state in a guide body 101 and pushes up the lowest expander 102 to thereby increase the highest expander 102. Are extruded one by one while being expanded by an upper diameter expanding guide member 103 and fitted into a ring groove 105 of a piston 104. Expander 10
Reference numeral 2 denotes a wavy ring as shown in (b), which can be elastically deformed with a small radial and axial force. The expander 102 is a C-shaped ring having a cut (not shown).

When the uppermost expander 102 is simply extruded from the diameter-enlargement guide member 103, at the moment when the extruder 102 is extruded, the expander 102 reduces its diameter by its own elastic force, and the ends of the cut portions become thicker. Direction or radial overlap. When the ends overlap in the thickness direction as in (c), as in (d),
The expander 102 may ride on the outer peripheral surface of the piston 104 and may not fit in the ring groove 105. (E)
When the ends overlap in the radial direction as in
As shown in FIG.
There is a possibility that it will run off. Therefore, it is necessary to constantly monitor the presence or absence of the expander 102 with a poor fitting. If there is the expander 102 with a bad fitting, a failure may occur in the next step unless the expander 102 is corrected immediately. . For this reason, a monitoring device for monitoring the fitting failure is required, and the repair work is troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique which does not require a monitoring device for monitoring a poor fitting of a piston ring and does not require a fitting correction operation.

[0007]

According to a first aspect of the present invention, there is provided a vertical cylindrical magazine having a large number of C-shaped piston rings held on an outer peripheral surface thereof in a stacked state. A piston ring supply device of a type in which the C-shaped piston ring is pushed down with a push-down arm to be dispensed and fitted into the ring groove of the piston. A C-type piston fitted into a ring groove in a magazine, comprising: a first depressing portion that presses down preferentially; and a second depressing portion that depresses another portion of the C-shaped piston ring after the first depressing portion. The ring is provided with a stopper which comes into contact with the end of the notch when it protrudes from the ring groove.

[0008] Since the vicinity of the notch of the C-shaped piston ring is pushed down by the first push-down portion prior to other parts, the C-shaped piston ring descends in an inclined state. For this reason,
In the C-shaped piston ring, the vicinity of the notch fits into the ring groove first. The ring groove regulates the axial movement of the end of the fitted notch. Since the ends of the notches do not move in the axial direction, the ends do not overlap in the thickness direction. Thereafter, the other part is pushed down by the second pushing part, so that the entire C-shaped piston ring fits into the ring groove.

[0009] The C-shaped piston ring tries to quickly return from the distorted shape to the original perfect circular shape as soon as it is fitted into the ring groove. The C-shaped piston ring temporarily expands and contracts in the radial direction due to the repetition of the sudden self-restoring force at that time and the repulsive force against the self-restoring force. Although both ends of the notch sway due to the expansion and contraction of the diameter, the way of the skew is not uniform. This is because each C-shaped piston ring has a manufacturing error and the like, and there is a variation in the expansion and contraction speed and a variation in the bending at both ends of the notch. As a result, both ends of the notch hit hard, and one of them tries to jump out of the ring groove. However, the end of the notch that has begun to protrude from the ring groove hits the stopper and does not protrude. Since they do not protrude from the ring groove, the ends do not overlap in the radial direction.

[0010] Thus, the C-shaped piston ring can be securely fitted into the ring groove. For this reason,
There is no need for a monitoring device for monitoring the poor fitting of the piston ring, and no fitting correction work is required. In addition, the work of mounting the piston ring can be performed quickly and reliably, and the mounting process can be completely automated.

According to the second aspect of the present invention, the direction of the notch of the C-shaped piston ring held in a stacked state on the outer peripheral surface of the magazine is defined by extending the stopper vertically along the outer peripheral surface of the magazine. The stopper functions as a guide member.

Since the stopper extends vertically along the outer peripheral surface of the magazine and also serves as a guide member, a member for defining the direction of the notch of the C-shaped piston ring held in a stacked state on the outer peripheral surface of the magazine. Need not be provided separately.
This simplifies the structure of the magazine.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. The piston ring assembling equipment of the present invention will be described after describing the configuration and operation of the piston and the piston ring assembled by this equipment. 1A and 1B are configuration diagrams of a piston obtained by a piston ring assembling equipment according to the present invention, wherein FIG. 1A is an exploded perspective view of a piston and a piston ring, and FIG. It is principal part sectional drawing of the piston in the state which was set.

FIG. 1A shows a piston 1 in which three ring grooves 1a, 1b, 1c are engraved on the outer circumference in order from top to bottom, and five piston rings are fitted into these ring grooves 1a to 1c. Indicates that The five piston rings are two compression rings (top ring 2,
A second ring 3) and a pair of oil rings (consisting of a central expander 4, a lower first side rail 5, and an upper second side rail 6), which are C-shaped rings having a notch N. is there. The top ring 2, the second ring 3, the first side rails 5, and the second side rails 6 are rings with flat upper and lower surfaces, and the expander 4 is a wavy ring. (B) shows a state where the piston rings 2 to 6 are assembled to the piston 1. In the case where the description is made without distinguishing the five piston rings, it is simply referred to as “piston rings 2 to 5”.
6 "or" Piston rings 2, 3, 5, 6 ".

FIG. 2 is a plan view of the facility for assembling the piston ring according to the present invention. Piston ring assembly equipment 10
Indicates a pallet A ₁ for unfinished products, in which pistons 1 before mounting a pitton ring (... indicate a plurality, the same applies hereinafter).
A front pallet conveying apparatus 11 for conveying the to A _4, a piston extraction device 12 is taken out from the work in progress pallet A ₂ the piston 1 by one, the piston conveying device 14 for conveying the piston 1 taken out is conveyed A piston reversing device 15 for reversing the piston 1 up and down, a transfer device 16 for intermittently transporting the piston 1 transferred from the piston reversing device 15, and a first piton ring individually attached to the piston 1 transported by the transfer device 16. -Fifth
Ring assembly unit (first to fifth piston ring feeder) 21 to 25, the piston housing 26 for housing the piston 1 after the piston ring attached to the finished pallet B _2, finished pallet B ₁ ~ consisting rear pallet conveying apparatus 27 for conveying the B _3.

The first ring mounting device 21 mounts the expander 4 (see FIG. 1), the second ring mounting device 22 mounts the first side rail 5, and the third ring mounting device 2
Reference numeral 3 denotes the second side rail 6, the fourth ring mounting device 24 mounts the second ring 3, and the fifth ring mounting device 25 mounts the top ring 2. In the case where the first to fifth ring assembling apparatuses 21 to 25 are described without distinction, simply refer to “Ring assembling apparatuses 21 to 2”.
5 ". 13 is an insole removal device, 28 is a monitoring device for monitoring the presence or absence of the piston 1, and T is one piston 1
On the tray. Unfinished product pallets A ₁ …
A large number of pistons 1 are housed with the head (top) of the piston 1 facing downward and the opening facing upward.

Next, the general operation of the piston ring assembling equipment 10 will be described. The front pallet transport device 11 is a device that repeats the following steps (1) to (3). (1) stage stacked was the lowest pallet A ₁ of A ₁ ... pallet unfinished product, it is conveyed by one pitch forward (upward in this figure). The pallets for unfinished products A ₁ …
The pistons 1 are stacked and stored in three stages, and each stage is partitioned by an insole (not shown). (2) the upper part of the piston from the work in progress for the pallet A ₂ 1 ...
After removing all, remove the upper insole with insole pickup device 13, housed in the empty pallet A ₃ neighbors. Then, take out the middle insole and the lower insole in this order, and take out all the pistons 1... And the insole. (3) After the empty pallet A ₃ of the front and staked to the forwardmost (palette A _4), conveyed by one pitch the pallet A ₂ newly emptied forward.

The assembly of the piston ring is as follows (1)-
It is executed by repeating the step (4). (1) The pistons 1 are taken out one by one from the pallet A ₂ for unfinished products by the piston take-out device 12 and are carried by the piston carrying device 14. (2) The conveyed piston 1 is turned upside down by the piston reversing device 15 and transferred to the transfer device 16. (3) Piton rings (not shown) are sequentially mounted on the piston 1 conveyed by the transfer device 16 by the first to fifth ring mounting devices 21 to 25. (4) the pitons ring piston 1 after mounting is housed in a finished product pallet B ₂ in the piston housing 26.

The rear pallet transfer device 27 has the following (1)
It is a device that repeats the steps (3) to (3). (1) One of the stacked finished product pallets B ₁ ... Is transported forward (upward in this figure) by one pitch. The finished product pallets B ₁ ... store the pistons 1 ... in one stage. (2) From the piston storage device 26 to the finished product pallet B ₂
Then, the pistons 1 with the pitton rings attached are housed one by one. (3) After fully accommodated in the finished product pallet B _2, it is staked to the forwardmost (pallet B _3).

Next, the first to fifth ring assembling devices 21 to 21
25 will be described. FIG. 3 is a front view of the first to fifth ring assembling apparatuses according to the present invention. Ring assembling devices 21 and 2
5 is a lower stand 32 erected on the base 31 respectively.
And an upper stand 33 erected on the lower stand 32,
A magazine unit 34 detachably attached to the base 33a of the upper stand 33, a lowering means 60 for forcibly dropping the lowest piston rings 2 to 6 held by the magazine unit 34, and the dropped piston rings 2 to 6 Is supplied to the piston 1 by depressing the pressure (see FIG. 4 for details).

The magazine unit 34 includes the upper stand 3
The base plate 35 is slidably attached to the base 33a of the third base plate 3a in the front and rear direction (in the front and back directions in this figure), and the vertically-mounted cylindrical magazine 40 (5
0). The magazine 40 (50) holds one of the piston rings 2 to 6 on the outer peripheral surface in a stacked state as indicated by imaginary lines. Upper stand 3
3 includes detection means 80 for detecting the lowest piston rings 2 to 6 that have fallen from the magazine 40 (50). The detection means 80 includes, for example, a light projector 81 and a light receiver 82.

FIG. 4 is a side view of the first to fifth ring assembling apparatuses according to the present invention. The lowering means 60 is screwed together with a servomotor 61 mounted on the upper side of the upper stand 33, a ball screw 62 mounted vertically and rotatably on the upper stand 33, and the ball screw 62 so as to be movable only in the axial direction. Nut 63 and descending arm 64 attached to nut 63
And a pressing ring 65 for effectively transmitting the operation of the descending arm 64 to the piston rings 2 to 6. A transmission mechanism 66 transmits power from the servo motor 61 to the ball screw 62.

The supply means 70 includes a first air cylinder 71 for lifting and lowering mounted on the lower stand 32 and a base 72 mounted on a piston rod 71a of the first air cylinder 71.
And a pair of right and left push-down arms 7 attached to the base 72.
A second air cylinder (see FIG. 7) for expanding the push-down arms 73 and 74 along a horizontal plane;
And a guide member 76 that prevents horizontal rotation of the member and allows only axial movement.

The transfer device 16 includes a magazine 40
Below (50), the first to fifth ring assembling devices 21 to 21
The tray T on which the piston 1 is placed is transported in the direction in which the 25 is arranged (the front and back direction in this figure). Further, at the position of each magazine 40 (50), the tray T is lifted and the magazine 40 (50) is lifted. Elevating means 16a for fitting the upper part of the piston 1 to the lower hole 48 (58) is provided. Ta is a storage cylinder part for storing the piston, and 16b are rollers for receiving the tray T.

There are two types of magazines 40 (50),
Each configuration will be described with reference to FIG. FIG. 5 (a),
(B) is a side view of the magazine according to the present invention, in which the length in the vertical direction is partially omitted. FIG. 5A shows a side surface shape of a magazine 40 (hereinafter, referred to as a “first magazine 40”) of the first ring assembling apparatus 21, and the first magazine 4.
Reference numeral 0 denotes a stock portion 42 for storing a large number of piston rings (expanders) 4 in a stacked state, a small-diameter portion 43 having a diameter slightly smaller than the stock portion 42, and a small-diameter portion 4.
3 and a widening portion 44 for expanding the piston rings 4... With a stock portion 42, a small diameter portion 43, and a widening portion 44 in this order from top to bottom. The stock part 42 and the small diameter part 43 are cylindrical. The expanding portion 44 includes a tapered portion 45 tapering upward and a large-diameter cylindrical portion 46 continuing below the tapered portion 45. The lower edge of the stock part 42
The separation unit 47.

The first magazine 40 has a stopper 91 extending downward from its lower end. The stopper 91 also serves as a guide member by extending vertically along the outer peripheral surface of the first magazine 40. Details of the stopper 91 will be described later with reference to FIGS.

FIG. 5B shows a side view of a magazine 50 (hereinafter, referred to as a "second magazine 50") of the second to fifth ring assembling apparatuses, and the second magazine 50 has a lowermost piston. Expanding portion 54 for expanding rings 2, 3, 5, and 6
And a stopper 52 for temporarily fixing the piston rings 2, 3, 5, and 6 excluding the piston ring which was higher and lower than the expanding portion 54. For more details,
The magazine 50 includes an upper cylindrical portion 51, a stopper portion 52, a lower cylindrical portion 53, and an expanding portion 54 in this order from top to bottom. The stopper portion 52 is a tapered body tapering upward. The expanding portion 54 includes a tapered portion 55 tapering upward and a tapered portion 5.
5 and a cylindrical large-diameter portion 56 that extends underneath. The lower edge of the stopper portion 52 is a separation portion 57.

The second magazine 50 has a guide member 96 extending vertically along the outer peripheral surface thereof.
Is made of a plate having a predetermined thickness. Specifically, the guide member 96
The piston rings 2,... Held in a stacked state on the outer peripheral surface of the second magazine 50 by inserting the notches N (see FIG. 1) of the piston rings 2, 3, 5, 6 into the thickness portions.
A member that defines the direction of the notch N of 3,..., Or 6.

FIG. 6 is a side view of a main part of the first magazine according to the present invention. The height of the lower end of the first magazine 40 is the piston 1
Is substantially the same level as the upper surface of the ring groove 1c. The height of the upper end of the storage cylinder Ta is substantially the same as the lower surface of the ring groove 1c of the piston 1. For this reason, the first magazine 40
The height of the gap δ between the lower end of the
It is almost the same as the height dimension of the ring groove 1c.

A stopper 91 also serving as a guide member
Is a vertically long member in which the first guide portion 92, the second guide portion 93, and the third guide portion 94 are connected in order from the top. The first guide portion 92 is a small thickness guide portion that extends vertically from the upper end of the stock portion 42 to the upper end of the tapered portion 45. The second guide portion 93 is a downwardly expanding tapered guide portion extending vertically from the lower end of the first guide portion 92 to the lower portion of the large diameter portion 46. The third guide portion 94 is a thick guide portion that extends vertically from the lower end of the second guide portion 93 to below the large diameter portion 46.

Each of the guide portions 92 to 94 has a notch N of the expander 4.
The direction of the notch N of the expanders 4... Held in a stacked state on the outer peripheral surface of the first magazine 40 is defined. More specifically, the first guide portion 92 includes the stock portion 42.
The direction of the notch N between the expanders 4... Held in a stacked state on the outer peripheral surface of the (first magazine 40) and the expanders 4 that have fallen beyond the separation unit 47 is defined. The second guide portion 93 is provided with the expander 4 that has fallen on the tapered portion 45.
And the direction of the notch N between the expander 4 and the middle part passing through the large diameter portion 46. The third guide portion 94 includes the large diameter portion 4.
Notch N of expander 4 paid out from the lower end of 6
The direction of is specified. The reason why the thickness of the third guide portion 94 is increased is to surely set the position of the expander 4 that is pressed by the sub-pressing arm described below.

The first ring assembling device 21 includes a separating portion 47.
And an air nozzle 97 for blowing compressed air toward a notch N in the expander 4 which is falling on the way. When the expander 4 is falling, the notch N
End portions N ₀ , N ₀ may be caught on the second guide portion 93 by frictional resistance. The air nozzle 97 is located at the end N of the notch N.
Compressed air is blown to the extent that the expander 4 naturally falls on ₀ and N ₀ , thereby forcibly removing the compressed air. For this,
Only when the detecting means 80 detects the fall of the expander 4, the air nozzle 97 is controlled by a control circuit (not shown) so as to intermittently blow out the compressed air by the detection signal. In the figure, 98 is an air pipe.

FIG. 7 is a sectional view taken along line 7-7 of FIG. Stopper 91, out of the expander 4 fitted into the ring groove 1c, a member the end portion N ₀ of the notch N hits when popping from the ring groove 1c, the member first magazine 4
It is characterized by a portion extending downward from the lower end of the zero. That is, the inner surface 91a of the portion extending downward, it is obtained by the strike the ends N ₀ of the notch N. From the outer circumferential surface of the expander 4 fitted into the ring groove 1c, to the inner surface 91a of the stopper 91 strikes the end portion N ₀ of the notch N, the clearance L ₁
And The clearance L ₁ is obtained by set smaller than the width L ₂ of the expander 4, for example, set to 0.8 times the width _{L 2 (L 1 = 0.8L 2} ). Reference numeral 95 denotes a bolt for stopping the stopper 91 on the first magazine 40.

FIG. 8 is a view taken along the line 8-8 in FIG. The descending arm 64 extends on both sides of the magazine 40 (50),
This is a bifurcated arm in plan view that pushes down the upper surfaces of the uppermost piston rings 2 to 6 stacked on the magazine 40 (50) via the pressing ring 65. 36, 36 are positioning pins for positioning the base plate 35 on the base 33a;
Reference numerals 7 and 37 denote handles attached to the base plate 35.

FIG. 9 is a sectional view taken along line 9-9 in FIG. The pair of right and left push-down arms 73 and 74 is attached to the magazine 40 (5
0) are arms that extend to both sides and push down the lowermost piston rings 2 to 6 that have fallen halfway and supply the pistons 1 to the piston 1.
a, 73a, 74a, and 74a. The second air cylinder 75 drives the pair of right and left push-down arms 73 and 74 to approach and separate from each other. By the way, only the push-down arms 73 and 74 of the first ring assembling device 21 are provided with sub-press-down arms 77 and 77. Hereinafter, description will be made with reference to the following drawings.

FIG. 10 is a plan view of the push-down arm of the first ring assembling apparatus according to the present invention. The push-down arms 73 and 74 of the first ring assembling device 21 are fitted in the ring groove 1c (see FIG. 1) by giving priority to the notch N of the expander 4 indicated by the imaginary line over other parts. Sub-pressing arms (first press-down portions) 77, 77 and contact portions (second press-down portions) 73a, 74a that press down other portions of the expander 4 behind the sub-pressing arms 77, 77. And Specifically, the sub-pressing arms 77, 77 are arms that swing the swinging tips facing each other along a horizontal plane. Reference numerals 78, 78 denote compression springs 78, 78 for urging the sub-pressing arms 77, 77 toward the center of the expander 4.

FIGS. 11A and 11B show the first embodiment according to the present invention.
It is a block diagram and operation | movement explanatory drawing of the push-down arm of a ring assembling apparatus. FIG. 11A shows that the swinging distal ends of the sub-pressing arms 77, 77 are provided with downward contact projections 77a, 77a. The lower surfaces of the contact protrusions 77a, 77a project below the lower surfaces of the contact portions 73a, 74a, and the height of the protrusion is substantially the same as the thickness of the expander 4.

Next, the operation of the push-down arms 73 and 74 of the first ring assembling device 21 will be described with reference to FIG.
To push down the lowest expander 4 that has fallen halfway, first, as shown in FIG.
a, 74a and the contact protrusions 77a, 77a are moved directly above the periphery of the expander 4. Next, as shown in FIG. 11B, by lowering the push-down arms 73, 74, the portions 4a, 4a near the notch N of the expander 4 are brought into contact with the contact convex portions 77a of the first push-down portion. , 77a. Thereafter, the other parts 4b, 4b of the expander 4 are pushed down by the contact parts 73a, 74a as the second pushing parts. Therefore, the expander 4 first descends near the notch N, and then descends at other portions. When the supply means 70 is returned, the push-down arms 73 and 74 are raised and then moved in directions away from each other. As described above, the pair of pressing arms 73 and 74 on the left and right push down the lowermost expander 4 to supply the same to the piston 1 (not shown).

Next, an expander (piston ring) 4
Will be described with reference to FIGS. FIGS. 12A and 12B are explanatory diagrams of the operation of the push-down arm of the first ring assembling apparatus according to the present invention (part 1), and FIGS. FIGS. 14 (a) to 14 (c) are action explanatory views (part 3) and FIGS. 15 (a) to 15 (c) of the push-down arm of the first ring assembling apparatus according to the present invention. ) Is the first according to the present invention.
FIG. 10 is an explanatory diagram (part 4) of the operation of the push-down arm of the ring assembling device.

First, referring to FIG.
When the members 3 and 74 are lowered, the contact convex portions 77 of the first pressing portion
a, 77a is a portion 4 near the notch N of the expander 4
a, 4a and pressed. Therefore, FIG.
As shown in FIG. 5, the expander 4 pushes down the neighboring portions 4a, 4a prior to the other portions, so that the expander 4 descends with the notch direction defined by the third guide portion 94 in the inclined state with the neighboring portions 4a, 4a lowered. I do. The expander 4 at this time is shown in FIG.
This is a state in plan view as shown in FIG. 3 (b), and has an irregular shape with the notch N expanded.

When the push-down arms 73 and 74 are further lowered, as shown in FIG. 14 (a), the contact projections 77a and 77a further push down the neighboring portions 4a and 4a to reach the ring groove 1c of the piston 1. . At this time, both ends N of the notch N
_{Since 0} and N ₀ are below the lower end of the large diameter portion 46, FIG.
As shown in a plan cross-sectional view shown in FIG. As shown in FIG. 14 (c), both ends N ₀ , N _{0 that} have come off
It fits in the ring groove 1c together with 4a. The ring groove 1c regulates the axial movement of the end portions N ₀ , N ₀ of the fitted notches N. Since the ends N ₀ and N _{0 of the} notch N do not move in the axial direction, the ends N ₀ and N ₀ do not overlap in the thickness direction.

Since the portions 4a, 4a near the notch N are fitted in the ring groove 1c, they do not descend further. The contact surface between the neighboring portions 4a, 4a and the contact convex portions 77a, 77a
This is a surface on which a horizontal component force can act.
As 4 further descends, the component force due to its descending force increases. When the component force exceeds the urging force of the compression springs 78, 78 (see FIG. 10), the contact convex portions 77a, 77a
As shown in (a), it swings outward and escapes. As a result, the contact portions 73a, 74a of the push-down arms 73, 74 push down the upper surface of the expander 4. The expander 4 is pushed down to be substantially horizontal, and the expander 4 shown in FIG.
, The whole fits in the ring groove 1c.

The expander 4 tries to quickly return from the irregular shape to the original perfect circular shape at the moment when the expander 4 is fitted into the ring groove 1c. The expander 4 temporarily expands and contracts in the radial direction by repeating the sudden self-restoring force at that time and the repulsive force against the self-restoring force. The ends N ₀ , N ₀ of the notch N swing due to the expansion and contraction of the diameter, but the manner of the swing is not uniform. That is, each expander 4 has a manufacturing error or the like, and both ends N of the notch N
_{At 0} and N ₀ , there are variations in expansion / contraction speed and variations in deflection. Therefore, and speed variation shrinks when the entire expander 4 extending in the radial direction is reduced in diameter at a time, transmitted to the end N _0, N ₀ of deflection way is notch N, both end portions N _0, N ₀ Swings.

As a result, both ends N ₀ , N ₀ of the notch N hit hard, and as shown in FIG.
try to jump out of c. However, the end portion N ₀ of the notch N that has begun to protrude from the ring groove 1 c hits the inner surface 91 a of the stopper 91 and does not protrude. Ring groove 1
Since they do not protrude from c, the ends N ₀ and N ₀ do not overlap in the radial direction. Thus, the stopper 9
Therefore, the run-out does not jump out of the ring groove 1c, and the run-out converges to the extent that the ends N ₀ and N ₀ collide with each other.

As is apparent from the above description, the notch N
In the vicinity 4a. , Along with fitting the 4a into the ring groove 1c in preference to other portions, since the notch N is provided stopper 91 so as not Tobidesa out of the ring groove, the end N ₀ of the notch N is ring groove 1c restricts the axial movement. Thus, the end N ₀ of the notch N is not able to overlap in the thickness direction or radial direction.

FIGS. 16A and 16B show a second embodiment according to the present invention.
It is operation | movement explanatory drawing of the push-down arm of a 5 ring assembly apparatus. When the lowermost piston rings 2, 3, 5, 6 are pushed down, first, a pair of push-down arms 73, 74 on the left and right are brought close to each other as shown in FIG.
3a, 73a, 74a, 74a to the piston ring 2,
It moves right above the periphery of 3,5,6. Next, FIG.
Lower each push-down arm 73, 74 as shown in FIG.
The lowermost piston rings 2, 3, 5, and 6 are pushed down by pressing predetermined portions (four locations) on the upper surfaces of the piston rings 2, 3, 5, and 6 with the contact portions 73a, 73a, 74a, and 74a. When the supply means 70 is returned, the push-down arms 73 and 74 are raised and then moved in directions away from each other. Thus, the pair of pressing arms 73 and 74
Pushes down the lowermost piston rings 2, 3, 5, and 6, and supplies the piston rings to a piston 1 (not shown).

Next, a method of supplying the piston rings 2 to 6 will be described with reference to FIGS. (1) In FIG. 3, a magazine 40 (50) in which a large number of piston rings 2 to 6 are stored in an outer peripheral surface in a stacked state is set vertically at a predetermined position (first step). For more information,
The base plate 35 of the magazine unit 34 is attached to the base 33a of the upper stand 33.

(2) In FIG. 4, when the tray T on which the piston 1 is placed is transferred to a position directly below the magazine 40 (50), the lifting / lowering means 16a raises the tray T, and the lower hole of the magazine 40 (50) is raised. The upper part of the piston 1 is fitted to 48 (58) (second step).

(3) By starting the servo motor 61 of the lowering means 60 and rotating the ball screw 62, the nut 63 screwed to the ball screw 62 is lowered, and the lowering arm 6
Lower 4. As a result, the descending arm 64 is
5, the uppermost piston rings 2 to 6 are pushed downward (third step).

(4) When a large number of the piston rings 2 to 6 in the stacked state are pushed down, the lowermost piston rings 2 to 6 are separated from the separation portion 47 (57) of the magazine 40 (50).
Fall over. The detection means 80 shown in FIG. 3 is a means for receiving a light beam (optical signal) constantly emitted from the light projector 81 by the light receiver 82. When the light beams are cut off by the lowest piston rings 2 to 6 that have passed the separation section 47 (57), the light receiver 82 detects this and outputs detection information (a fourth step as a piston ring detection step). ). That is, since the lowermost piston rings 2 to 6 fall under their own weight when they pass the separation section 47 (57), the detection information simply indicates whether the lowest piston rings 2 to 6 have passed the separation section 47 (57). It may be an on / off signal for detecting whether or not this is the case.

(5) The servo motor 61 of the lowering means 60 shown in FIG. 4 is stopped based on the detection information. As a result, the lowering of the lowering arm 64 and the pressing ring 65 stops (fifth step).

(6) Lowermost piston ring 2 that has fallen
-6 are now pushed down by the supply means 70 and the magazine 40
It is dispensed from the lower end of (50) and supplied to the ring groove of the piston 1 (sixth step). (7) The tray T on which the piston 1 is placed is lowered and transported by the transfer device 16 (seventh step). In this manner, the above-described second to seventh steps are repeated to supply the piston rings 2 to 6 to the respective pistons 1 being conveyed by the transfer device 16.

Next, the detailed operation of the first ring assembling device 21 will be described with reference to FIG. In order to facilitate understanding, in FIG. 17, the top expander is 4U,
The lowest expander is called 4D. FIG. 17 is an operation explanatory view of the first ring assembling apparatus according to the present invention. The plurality of expanders 4 are arranged in the first ring assembling device 21.
It is stocked in the magazine 40 in a stacked state. Specifically, the expanders 4 are elastically deformable with a small force in the radial direction and the axial direction, and are held by loosely fitting to the stock portion 42 having a diameter slightly larger than the inner diameter of the expanders 4. Slipping is prevented. For this reason,
Wave-shaped expander 4 stocked in a stacked state 4 ...
The corrugations do not fit each other. Therefore, only the lowest expander 4D can be reliably separated.

The uppermost expander 4 is pressed by the pressing ring 65.
When U is pressed (arrow), the lowest expander 4D
Is forcibly extruded, falls by its own weight beyond the separating portion 47 (arrow), reaches the tapered portion 45 of the expanding portion 44 through the small diameter portion 43, and stops (position). Next, the pair of push-down arms 73, 74 on the left and right moves above the lowest expander 4D, and pushes down further (arrows). For this reason,
The lowermost expander 4D is expanded in the radial direction, is discharged from the lower end of the first magazine 40 through the tapered portion 45 and the large diameter portion 46. At this time, the lowest expander 4D is supplied to the lowest ring groove 1c of the piston 1 while reducing its diameter by its own elastic force (arrow). As a result, the lowest expander 4D is fitted in the ring groove 1c.

Next, the second to fifth ring assembling devices 22 to
25 will be described in detail with reference to FIG. Since the second to fifth ring assembling devices 22 to 25 have the same operation, only the operation of the fourth ring assembling device 24 will be described, and the description of the other ring assembling devices 22, 23 and 25 will be omitted. . In addition, in order to facilitate understanding, FIG.
The top second ring is called 3U, and the bottom second ring is called 3D. FIG. 18 is an operation explanatory view of the fourth ring assembling apparatus according to the present invention. Many second rings 3 ...
Are stored in the second magazine 50 of the fourth ring assembling apparatus 24 in a stacked state. Specifically, the second rings 3 can be elastically deformed with a small radial force and are temporarily fixed by the stopper portions 52. When the uppermost second ring 3U is pressed by the pressing ring 65 (arrow), the lowermost second ring 3D is forcibly pushed out while being expanded by the stopper portion 52, and falls by its own weight beyond the separating portion 57 (arrow). ), Passing through the lower cylindrical portion 53 and expanding portion 54
And stops (position).

Next, a pair of right and left push-down arms 73, 74
Moves onto the second ring 3D at the lowest position, and further pushes down (arrow). For this reason, the lowermost second ring 3D is expanded in the radial direction, and the large diameter portion 5
6 and is paid out from the lower end of the second magazine 50. At this time, the lowermost second ring 3D is reduced in diameter by its own elastic force, while the middle ring groove 1
b (arrow). As a result, the lowermost second ring 3D is fitted in the ring groove 1b.

Next, the order of mounting the piston rings 2 to 6 will be described with reference to FIG. FIGS. 19 (a) to 19 (e) are illustrations for explaining the mounting order of the piston ring according to the present invention.
First, the expander 4 is mounted in the ring groove 1c by the first ring mounting device 21 shown in FIG. Next, the first side rail 5 is mounted on the ring groove 1c and below the expander 4 by the second ring mounting device 22 shown in FIG. Next, the third ring assembling device 23 shown in FIG.
c and above the expander 4, the second side rail 6
Install. Next, the fourth ring assembling device 24 shown in FIG.
Then, the second ring 3 is attached to the ring groove 1b. Finally, the fifth ring assembling device 25 shown in FIG.
Attach the top ring 2 to a.

The lower ends of the magazines 40 (50) have the same height. For this reason, the height relationship between the ring grooves 1a to 1c of the piston 1 and the lower end of the magazine 40 (50) is determined by the ascending position of the piston 1 in each mounting step. The upper end position of the storage cylinder Ta is substantially the same as the lower surface of the ring groove 1c of the piston 1. Further, the gap S between the outer periphery of the piston 1 and the lower hole 58 of the magazine 50 in the second ring assembling device 22 shown in FIG.
First, third to fifth ring assembling devices 21, 23, 24,
It is larger than the gap of 25. Therefore, when the expander 4 is incompletely mounted in the ring groove 1c by the first ring mounting device 21 and protrudes, when the piston 1 is inserted into the second magazine 50 of the next second ring mounting device 22, There is no fear of contact with the magazine 50.

In the above embodiment, the first ring assembling device 21 is different from the magazine 40 shown in FIG.
The magazine 50 of FIG. 5B may be provided. Also, the second
The fifth to fifth ring assembling apparatuses 22 to 25 may include the magazine 40 of FIG. 5A in addition to the magazine 50 of FIG. Further, the stopper 5 of the magazine 50 shown in FIG.
2 is not limited to a tapered body tapering upward, but may be any as long as it temporarily fixes the stacked piston rings 2 to 6, for example, a plurality of protrusions provided around the lower portion of the upper column 51. Good.

The magazine 40 (5) shown in FIGS.
Each of the enlarged portions 44 (54) of (0) may be constituted only by the tapered portion 45 (55) tapering upward. The order of attaching the piston rings 2 to 6 is not limited to the order shown in FIGS. Detecting means 80
Means that the lowest piston rings 2 to 6 are in the magazine 40 (5
Any device that detects whether or not the light has passed the separation unit 47 (57) provided in (0) may be used. In addition to the optical system including the light projector 81 and the light receiver 82, for example, a non-contact system such as an ultrasonic system May be.

The stopper 91 and the guide member 96 are the first
The present invention is not limited to a configuration in which the first and second magazines 40 and 50 are bolted to each other.
It may be formed integrally with 0. In the second magazine 50 of the second ring assembling device 22, the guide member 96 may be replaced with the stopper 91 shown in FIG. If it replaces, the sudden expansion and contraction action when the first saddle rail 5 is fitted to the piston 1 can also be prevented. In this way, the expander 4 fitted before that is not affected by the sudden expansion and contraction action of the first saddle rail 5, and maintains the state of being more stably fitted in the ring groove 1c.

[0062]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, there is provided a push-down arm with a first push-down portion that pushes down the vicinity of the notch of the C-shaped piston ring in preference to other portions, and a C push-up portion delayed from the first push-down portion.
A second press-down portion for pressing down another part of the piston ring, and the magazine has a stopper which, when the end of the notch of the C-shaped piston ring fitted into the ring groove comes out of the ring groove, comes into contact with the magazine. It is characterized by having.

Since the vicinity of the notch of the C-shaped piston ring is pushed down by the first push-down portion prior to other parts, the C-shaped piston ring descends in an inclined state. For this reason,
In the C-shaped piston ring, the vicinity of the notch fits into the ring groove first. The ring groove regulates the axial movement of the end of the fitted notch. Since the ends of the notches do not move in the axial direction, the ends do not overlap in the thickness direction. Thereafter, the other part is pushed down by the second pushing part, so that the entire C-shaped piston ring fits into the ring groove.

The C-shaped piston ring tries to quickly return from the irregular shape to the original perfect circular shape at the moment when it is fitted into the ring groove. The C-shaped piston ring temporarily expands and contracts in the radial direction due to the repetition of the sudden self-restoring force at that time and the repulsive force against the self-restoring force. Although both ends of the notch sway due to the expansion and contraction of the diameter, the way of the skew is not uniform. This is because each C-shaped piston ring has a manufacturing error and the like, and there is a variation in the expansion and contraction speed and a variation in the bending at both ends of the notch. As a result, both ends of the notch hit hard, and one of them tries to jump out of the ring groove. However, the end of the notch that has begun to protrude from the ring groove hits the stopper and does not protrude. Since they do not protrude from the ring groove, the ends do not overlap in the radial direction.

As a result, the C-shaped piston ring can be securely fitted into the ring groove. For this reason,
There is no need for a monitoring device for monitoring the poor fitting of the piston ring, and no fitting correction work is required. In addition, the work of mounting the piston ring can be performed quickly and reliably, and the mounting process can be completely automated.

According to the second aspect of the present invention, since the stopper extends vertically along the outer peripheral surface of the magazine and also serves as a guide member, the notch of the C-shaped piston ring held in a stacked state on the outer peripheral surface of the magazine. A member for defining the direction of
There is no need to provide it separately. This simplifies the structure of the magazine.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a piston obtained by a piston ring assembling equipment according to the present invention.

FIG. 2 is a plan view of a piston ring assembling facility according to the present invention.

FIG. 3 is a front view of the first to fifth ring assembling apparatuses according to the present invention;

FIG. 4 is a side view of the first to fifth ring assembling apparatuses according to the present invention;

FIG. 5 is a side view of a magazine according to the present invention.

FIG. 6 is a side view of a main part of the first magazine according to the present invention.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a view taken along line 8-8 in FIG. 4;

FIG. 9 is a sectional view taken along line 9-9 in FIG. 4;

FIG. 10 is a plan view of a push-down arm of the first ring assembling apparatus according to the present invention.

FIG. 11 is a configuration diagram and operation explanatory diagram of a push-down arm of the first ring assembling apparatus according to the present invention.

FIG. 12 is a view for explaining the operation of the push-down arm of the first ring assembling apparatus according to the present invention (part 1).

FIG. 13 is a view for explaining the operation of the push-down arm of the first ring assembling apparatus according to the present invention (part 2).

FIG. 14 is a view for explaining the operation of the push-down arm of the first ring assembling apparatus according to the present invention (part 3).

FIG. 15 is a view for explaining the operation of the push-down arm of the first ring assembling apparatus according to the present invention (part 4).

FIG. 16 is a view for explaining the operation of the push-down arm of the second to fifth ring assembling apparatuses according to the present invention.

FIG. 17 is a diagram illustrating the operation of the first ring assembling apparatus according to the present invention.

FIG. 18 is a view for explaining the operation of the fourth ring assembling apparatus according to the present invention.

FIG. 19 is an explanatory diagram of a mounting order of a piston ring according to the present invention.

FIG. 20 is an explanatory diagram for explaining a conventional expander fitting method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Piston, 1c ... Ring groove, 4 ... C type piston ring (expander), 4a ... A part near a notch, 4b ...
Other parts: 10: piston ring assembling equipment, 21: first ring assembling device (first piston ring supply device),
40: first magazine, 70: supply means, 73, 74: pressing arm, 73a, 74a: second pressing part (contact part), 77: first pressing part (sub-pressing arm), 77
a: contact convex portion, 91: stopper, 92-94: guide member (first, second, third guide portions), 95: bolt, N ...
Notch.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshihiro Tsuchiya 1-1-13 Aoi Higashi, Hamamatsu City, Shizuoka Prefecture Inside Honda Motor Co., Ltd. Hamamatsu Factory

Claims (2)

[Claims] 1. A large number of C-shaped piston rings are held in a stacked state on the outer peripheral surface of a vertical cylindrical magazine, and the lowermost C-shaped piston ring is pushed down by a push-down arm to be dispensed, and is discharged into a ring groove of the piston. A piston ring supply device of a fitting type, wherein the push-down arm includes a first push-down portion that pushes down the vicinity of the notch of the C-shaped piston ring in preference to other portions, and a first push-down portion. A second depressing portion for depressing the other part of the C-shaped piston ring with a delay, wherein the magazine has a notch end portion of the C-shaped piston ring fitted in the ring groove, which protrudes from the ring groove. A piston ring supply device, comprising: 2. The guide member, wherein the stopper vertically extends along an outer peripheral surface of the magazine to define a direction of a notch of a C-shaped piston ring held in a stacked state on the outer peripheral surface of the magazine. The piston ring supply device according to claim 1, wherein the piston ring supply device also serves as: