JPS58181525A - Automatic inserter for piston ring - Google Patents

Abstract

PURPOSE:To make a piston ring insertable into a ring groove in an automated manner, by installing an expander claw engaging and expanding the piston ring, a pressure claw and a lifter. CONSTITUTION:A piston ring 8 cut out by a cutting claw 71 is engaged and expanded. Each of pressure claws 6 being fitted with each of plural expander claws 5, which is supported movably in radial direction and has the surface engaged with the inner circumference of the piston ring 8 and is movably supported at the outer circumference side in an axial direction, is installed. Both pressure claws 6 and expander claws 5 are all disposed in a state of concentricity, and a lifter 9 moving these expander claws 5 relatively in relation to a piston 89 is installed as well. Therefore, a spacer expander having a slip joint, a multi-winding piston ring and the like is made insertable into a ring groove in an automated manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for automatically inserting a spacer expander of a piston ring, particularly a combination oil ring, into a piston ring groove of a piston.

As is well known, a piston ring has an abutment, and the abutment is opened to be inserted into a piston ring groove of a piston, and an automatic insertion device is no exception to this. The automatic piston ring insertion devices currently in use are the 16652 Japanese Patent Publication No. 36-16652 and the 16652 Japanese Publication No. 55
-51689 and many others, but basically, as shown in Figure 1, they consist of a magazine 2 that stores piston rings 8 in a stack, a cutting plate 7 that feeds out piston rings 8, and a guide jig that guides and expands piston rings. 3. It is composed of an indenter cylinder 4 for pushing out the piston ring, and a lid 9 for raising and lowering the piston 89. The operation is such that the piston ring is sent out one by one from the magazine 2 by the cutting plate 7 to the guide jig 3, and the piston ring fitted in the guide jig 3 is transferred to the indenter cylinder 4.
As the guide jig 3 descends, the ring is expanded at the conical part 32 of the guide jig 3,
Piston ring groove 88 position 1 of piston 89 fitted in advance to piston fitting port 39 of guide jig 3 by lifter 9
The piston ring is inserted by being pushed by the piston ring. Further, the cutting plate 7 is attached to the cylinder 17, the indenter cylinder 4 is attached to the cylinder 14, and the piston 89 is attached to the cylinder 18.
The guide jig 3 is fixed to the base 1 by a support plate 34 for use. This support plate 34 is connected to the abutment 8 of the piston ring 8 as shown in FIG.
0, the piston ring abutment 80 can pass through without hanging on the support plate 34 by providing the cutout plate 7 with a protrusion 78 that supports the abutment. As shown in FIG. 3, the spacer expander 8 is formed into a wave shape in the radial or axial direction and has an extremely flexible structure, but at the same time, it is extremely difficult to assemble into the piston. This spacer expander is used by combining two sight rails 87 as shown in FIG. Because of the wavy shape, the abutments 80 overlap during assembly as shown in FIG. 5, and the piston rings themselves tend to become tangled during transportation. In contrast, a needle-like member called a slip joint 81 is combined as shown in FIG.
Even if 0 opens, the slip joint 81 will keep the joint 8 open.
0 is guided, and tangles and overlaps at the joints can be prevented.

However, in the case of a piston ring such as a spacer expander having a slip joint, or a multi-wound piston ring 8 as shown in Fig. 7, the ring of the piston ring is closed, as shown in Fig. 2. like support plate 3
4, the piston ring 8 cannot pass through the guide jig 3.

This also applies to automatic piston ring insertion devices in which the piston ring is expanded using a claw that hooks the abutment 80 of the piston ring 8, and then inserted into the piston ring groove. It cannot be applied to piston rings that are difficult to hook.

The present invention can also be applied to a piston ring or multi-wound piston ring having a slip joint as described above, or a combination oil ring in which a sight rail and a spacer expander are temporarily attached with a low melting point adhesive as shown in Fig. 4. The object is to obtain an automatic piston ring insertion device, the gist of which is an automatic piston ring insertion device that has the following five constituent elements as described in the claims.

■ Equipped with a cutting claw that feeds out the piston ring.

■ A plurality of expanded rings that are movably supported in the radial direction and have a retaining surface on the outer peripheral surface of the tip that engages with the inner peripheral surface of the piston ring, which locks and expands the piston ring cut out with the cutting claw. Equipped with a mold.

■ Equipped with a crown claw that is supported movably in the axial direction on the outer circumferential side of the expanded ring type.

■　The prince claw and the expanded ring type are arranged concentrically.

■ Equipped with a lifter that moves the ring expansion type relative to the piston.

The present invention will be described in detail below with reference to Examples. 8 is a sectional view of the first embodiment of the present invention, FIG. 9 is a perspective view of the embodiment of FIG. 8, and FIG. 10 is an enlarged view of the main part of FIG. 8, and FIG. The BB sectional view of FIG. 11 is A of FIG. 10.
01 in the -A sectional view, the piston ring 8 is the magazine 2
The magazines 2 are removably attached to a magazine holder 20 fixed to a column attached to a cutout plate stand 70, and the bottom surface 21 of the magazine 2 is lifted above the cutout plate 7. At a position corresponding to the bottom surface 21 of the magazine 2, a cutting plate 7 corresponding to the shape of the piston ring and having a cutting claw 71 at the tip for fitting the piston ring is disposed, and the cutting plate 7 is reciprocated by the cylinder 17. .

The forward and backward movement of the cutting plate 7 is adjusted by the stopper 79 and the like, with the cutting claw 71 setting the magazine 2 position as the backward limit and the cutting claw 71 moving forward at the indenter cylinder 4 position.

Place the piston ring 8 into the piston ring groove 8 of the piston 89.
The means for inserting into the indenter cylinder 8 includes an indenter cylinder 4 having a ring expansion amount 5 and an indenter mold 6, a hanging lid 9 and a cylinder 14 for relatively moving the piston 89 and the indenter cylinder 4.

As shown in FIGS. 10 and 11, the indenter cylinder 4 includes an indenter mold 6 and an annular expansion amount 5, and an indenter piston 60 that moves the indenter mold 6 up and down.
It has a ring expansion piston 50 inside which expands the ring by a ring expansion amount 5. The ring expansion piston 50 is coupled to a ring expansion cone 51, and a plurality of ring expansion elements 52 (four sets in the embodiment) are brought into contact with the ring expansion cone 51 by springs 53 and the like. Further, a ring expansion amount 5 is attached to the ring expansion element 52, and as the ring expansion piston 50 descends, the ring expansion element 52 that comes into contact with the ring expansion cone 51 moves radially outward, and the ring expansion amount 5 becomes concentric. The ring is expanded. Also, ring expansion piston 5
By releasing the liquid pressure above zero, the ring expander 51
The ring expansion piston 50 is raised by the spring 53 of the ring expansion piston 50 and the spring 54 of the ring expansion piston 50, and the ring expansion element 52 is also closed.

On the other hand, the prince claw 6 is connected to the indenter piston 6 by a plurality of rods 61.
0 and is lowered by applying fluid pressure to the indenter piston 60, and raised by the spring 62 when the fluid pressure is released.

Further, in the indenter cylinder 4, a cylinder 46 of an indenter piston, a guide groove for an indenter piston rod 61 and a ring expander 52 are formed in the indenter cylinder main body 40, and an upper plate 45 and a ring expander 52 are formed.
and a lower plate 44 that guides it from below.

The indenter cylinder 4 thus constructed is connected to the cylinder 14 via the ram plate 41, as shown in FIG. 8, and is raised and lowered while being guided by a column 42 fitted to the ram plate 41. A stopper 49 for controlling the vertical position of the indenter cylinder 4 is attached to the support column 42.

As shown in FIG. 8, a lifter 9 that supports a piston 89 and raises and lowers it is provided below and has the same axis as the indenter cylinder 4. Further, the lifter 9 is provided with a guide 91 on the base 1, and its movement is controlled by stoppers 92 and 93.

Next, the operation of the automatic piston ring insertion device of the present invention will be explained.

When the cutout plate 7 is at the retraction limit as shown in FIG. 8, the lift 9 of the piston 89 is also at the lower limit, the indenter tube 4 and the indenter mold 6 are at the upper limit, and the ring expansion amount 5 is in the closed ring state. .

Next, as shown in FIG. 9, the cutting plate 7 moves forward, and the piston ring 8 is cut out by the cutting claw 71.
It is fed out to a position corresponding to the indenter cylinder 4 supported by the cylinder 1.

Next, as shown in FIG.
(not shown in Figure 2), the ring expansion amount 5 tip is cut out by the claw 71
It is lowered to the top. At this time, the ring expansion amount 5 is in a closed ring state and is located on the inner peripheral side of the piston ring 8.

Next, by operating the ring expansion piston and opening the ring expansion element, a ring expansion amount 5 is created on the inner circumference of the piston ring 8 as shown in FIG.
contact and further expand the piston ring 8 by the required amount.

The amount of ring expansion is adjusted by the stopper 55 of the ring expansion cone 51 attached to the lower plate 44 shown in FIG. 13. Next, as shown in FIG. It operates to raise the piston 89.

At this time, the upper limit of the lifter 9 is limited by the stopper 93, the piston 89 is fitted on the inner periphery of the ring expansion amount 5, and the piston ring groove 88 is further adjusted so as to be located at the tip of the ring expansion amount 5.

Next, as shown in FIG. 15, the indenter piston (not shown) is operated and the indenter rod 61 is lowered, so that the indenter mold 6 is lowered, and the piston ring 8, which has been expanded by 1, is moved by the piston 891 rule. Extrude with Hestonopa 651\n placement,
Insertion of the piston ring into the piston ring groove is achieved.

Next, after the piston 89 is lowered by the lifter 9, the fluid pressure of the ring expansion piston and the fluid pressure of the indenter piston are sequentially released, the ring expansion amount 5 is closed, and the indenter mold is raised.At the same time, the indenter cylinder is raised. The state shown in the figure is restored and the next automatic piston ring insertion is repeated.

In this embodiment, the magazine 2 shown in FIG. 8, the cutout claw 71, the lifter 9, the ring expansion amount 5 and the indenter mold 6 shown in FIG. The amount of movement is determined by the stopper 55 shown in FIG.
Both can be adjusted by the stopper 93 shown in the figure.
It is possible to insert various types of piston rings into various types of pistons.

Furthermore, other embodiments of the present invention will be explained. First, it is preferable that the cutting claw 71 be lightly supported by a flexible support plate 72 as shown in FIGS. 16 and 9. This is because the piston ring 8 is expanded on the cutting claw 71, so the shape of the cutting claw 71 has to be larger than the shape of the piston ring before the ring expansion.
is easy to move on the cutting claw 71, and is supported by a flexible support plate 72, specifically a weak leaf spring.

Furthermore, as shown in FIG.
It is preferable to shift the center C of the piston ring 8, which is fixed in position at 2, toward the cutting claw 71 side from the center of the ring expansion amount 5. The ring expansion amount 5, which expands concentrically by shifting the center, contacts the cutout plate 71 of the sweet piston ring 8 in the opposite direction and acts to separate the piston ring 8 from the cutout claw 71, thereby changing the shape of the cutout claw 71. Even if the piston ring has substantially the same shape as the piston ring 8, the ring expansion of the piston ring prevents the piston ring from being squeezed between the cutting claw 71 and the ring expansion amount 5.

Furthermore, the shape of the ring expansion amount 5 is as shown in Figs. 10 and 11.
When the ring is closed, the gap is almost eliminated, and when the ring is expanded, it is formed from a circular arc having a diameter approximately equal to the piston diameter so that it corresponds to the piston.

Also, as shown in Figure 10, the outer peripheral surface of the ring expansion claw tip is formed into a perfect cylinder for the purpose of making it easier to attach the piston ring, but this can be done with a spacer expander that has a small self-tension and does not require ring expansion force S. The wall thickness is made smaller and the insertability of the piston ring is increased. On the other hand, when enlarging a piston ring with a large self-tension such as a multi-wound piston ring, as shown in FIG. It is preferable to provide it on both sides of the mold.

In addition, since the spacer expander shown in FIG. 5 has a protrusion 82 that protrudes toward the inner circumference of the piston ring, problems tend to occur when the spacer expander placed on the cutting claw is hung by the amount of ring expansion. However, as shown in Fig. 18, a hole 77 larger than the inner diameter of the piston ring is provided in the cutting plate 71, and when the ring expansion amount 5 is less than or equal to the inner diameter of the hole, the indenter cylinder is raised. Misfitting of the piston ring can be prevented by proceeding with ring expansion.

At the same time, this method prevents the ring expansion amount 5 from colliding with the cutting claw 71 when the ring expansion amount is lowered. hole 77
In order to prevent the piston ring from getting caught in the hole when the piston ring is cut out from the magazine, a cover 85 supported by a spring 86 is used to flatten the top of the cutting claw 71 as shown in FIG. 19. shall be kept as such. Also in this implementation, damage to the ring expansion amount and poor engagement of the piston ring can be prevented.

Although the present invention has been described above according to the embodiments, the piston ring automatic insertion device and its operation of the present invention are not limited to the embodiments. Automatic piston ring insertion can be achieved if the piston ring is equipped with a movable lifter. For example, in the embodiment shown in FIG. 8, the piston is raised by the lifter 9 of the piston 89, but it is also possible to fix the piston and lower the indenter cylinder 4 to the piston position. Furthermore, a cam or a link mechanism may be used instead of the ring expansion cone 51 as the ring expansion means of the ring expansion mold 5 as shown in FIG. The indenter mold and the ring-expanding mold are assembled in the indenter cylinder in order to arrange them concentrically, and as shown in FIG. The tube 57 is raised and lowered by a cylinder 15 attached to the base 1, an indenter mold 6 is disposed concentrically with the ring expansion mold 5, and a cylinder 16 is arranged to raise and lower the indentation claw 6 relative to the base 1. The present invention is also achieved by the following.

In the above embodiment, the ring expansion mold 5 latches and expands the piston ring placed on the cutting claw, so the piston needs to be placed below the ring expansion mold. The present invention is also applicable to a type of automatic piston ring loading device in which the piston is placed horizontally.

In such an embodiment, as shown in FIG.
Piston holder 84 which can be raised and lowered by cylinder 19
an expanded ring type 5 similar to that shown in FIG.
An indenter cylinder 4 having an indenter die 6 is fixed to an indenter ram plate 41 and moved up and down by a cylinder 14. In this embodiment, first, the cutting claw 71 is advanced, and then the height of the piston ring is lowered and the indenter cylinder 4 is raised, and the ring expansion mold 5 is expanded to the extent that the piston ring can be hung thereon, and then the teta cutting claw 71 is moved back. Then, at the same time as the ring expansion mold 5 is further expanded, the indenter cylinder 4 is raised to fit the piston 89 into the ring expansion claw 5, and then the indenter mold 6 is raised to complete the insertion of the piston ring into the piston. be done. In this case, the cut-out claw 71 has a 22nd
A flexible support plate 72 is provided which has a notch 74 having a semicircular end larger than the inner diameter of the piston ring and smaller than the outer diameter as shown in the figure, and flexibly supports the piston ring.

Another embodiment, as shown in FIG. 23, has a cut-out claw 71 divided into two parts, the cut-out claw 71 is rotatably attached to a pin 73 assembled to the cut-out plate 7, and the cut-out claw has a ring-enlarging piston. A cutting claw that opens the cutting claw 71 by the operation of the rod 75 is used. This cut-out claw 71 is closed by a predetermined force by a spring 76, and clamps the piston ring 8. In an embodiment equipped with such a cut-out claw, in FIG. 21, the cut-out claw 71 is fed by the ring expansion claw 5 upper shaft, and then the cut-out claw 71 is opened to transfer the piston ring 8 to the outer periphery of the ring expansion claw 5. Then, the cutting claw 71 is retreated to expand the ring expansion mold 5, fit the piston,
Piston ring insertion is performed continuously using an indenter type. When using the cutting claw of the embodiment shown in FIG. 23, the magazine 2 shown in FIG. can be used.

As described above, the present invention includes a cutting claw for cutting out piston rings one by one, a ring expansion type for locking and enlarging the piston rings supplied from the cutting claw, and an indenter type concentrically with the ring expansion type. In addition, the piston can be moved relative to the ring expansion type, and by providing a lid, spacer expanders with slip joints, multi-wound piston rings, or sight rails can be expanded with a low melting point adhesive, etc. An automatic piston ring insertion device is achieved which can automatically insert even a piston ring having substantially no gap, such as a combination oil ring temporarily secured to an expander, into a piston ring groove.

It goes without saying that the present invention can also be used for ordinary piston rings having abutment, but for piston rings having such an abutment that require control of the abutment position, as shown in FIG. Guidance 68 for fitting the indenter mold 6
Similarly, the ring expansion type is also provided with a fitting hole.

[Brief explanation of the drawing]

FIG. 1: A sectional view of a conventional piston ring automatic insertion device. FIG. 2; 1st factor plane sectional view. Figure 3: Spacer expander top view. FIG. 4: A cross-sectional view showing how the spacer expander is used. FIGS. 5 and 6' are plan views of main parts of a conventional spacer expander. FIG. 7: A perspective view of a multi-wound piston ring. FIG. 8: A sectional view of a first embodiment of the automatic piston ring insertion device of the present invention. FIG. 9; FIG. 8 is a perspective view showing the main parts of the first embodiment. Figure 10: An enlarged sectional view of the 8th fixed part, B- in Figure 11.
B sectional view. Fig. 11; Fig. 10 AA sectional view. FIGS. 12 to 15; sectional views showing the operation of the automatic piston ring insertion device of the present invention. Figures 16 to 20; Cross-sectional views of other embodiments of the present invention 2nd
Figure 4: A perspective view of another embodiment of the present invention. Explanation of amount applied 1. Base 2. Magazine 4 Indenter tube
5. Ring expansion mold 51 Ring expansion cone 52 Ring expansion element 6 Indenter claw
60 Indenter piston 7 Cut-out plate
71. Cutting claw 8 Piston ring 809 Joint opening 88 Piston ring groove 89 Piston 9 Lifter Patent applicant Nippon Piston Ring Co., Ltd. Figure 5 Figure 6 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 2 Figure 21

Claims (5)

[Claims] (1) A cut-out claw that feeds out piston rings one by one, a means for locking and enlarging the piston ring fed out from the cut-out claw, and an indenter cylinder that pushes out the enlarged piston ring into the piston ring groove. In the automatic piston ring insertion device, the piston ring locking/enlarging means includes a plurality of expansion claws that are movably supported in the radial direction and that engage with the inner periphery of the piston ring on the outer peripheral surface of the tip. and a crown claw supported movably in the axial direction on the outer circumference side of the expansion claw, the prince claw and the expansion claw are arranged concentrically, and the piston is moved relative to the expansion claw. An automatic piston ring insertion device characterized by being equipped with a lifter that can be moved. (2) An indenter cylinder having a ring expansion element to which the ring expansion claw is fixed, a ring expansion cone for expanding the ring, and a ring expansion piston, and an indenter piston to which the ring expansion claw is fixed; The automatic piston ring insertion device described in Patent No. 1 is characterized by comprising a cylinder supported so as to be able to rise and fall. (3) The automatic piston ring insertion device according to claim 1, further comprising a lifter that supports the piston as means for moving the piston relative to the ring expander. (4) The cutting claw is provided with a hole that is larger than the inner diameter of the piston ring and smaller than the outer diameter, or is provided with a cover that covers the hole and is supported by a flexible means. Automatic piston ring insertion device as described. (5) The piston ring automatic insertion device according to claim 1, wherein the cutting claw is formed by a plurality of cutting claws rotatably coupled to a cutting plate.