JPH08323554A - Piston ring assembler - Google Patents

Abstract

PURPOSE: To make each spacer ring standby without overflowing from the upper end of a magazine part by forming a notch stepped part provided with a level difference equivalent to the height of a lap part of respective spacer rings with one another extending over the whole circumference of the upper end of the magazine part. CONSTITUTION: Those of upward inertial force with the pushing up and of vibrational force with the fitting and the like work on each of spacer rings 1 fitted in a notch stepped part 7c of a magazine 3, therefore these spacer rings 1 slide upward along the peripheral surface of this stepped part 7c, and consequently, they slip out of the upper end of a cup member 7. Subsequently, the spacer rings 1 are elastically contracted and fitted in a piston ring. At the point of time when each spacer ring 1 is fitted in a piston groove, another space ring 1 to be assembled next time is situated in the upper end of the cup member 7. Namely, it is situated in a state of being not protruded from the upper end of the cup member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for assembling a piston ring, particularly a spacer ring, which is a component of an oil ring, into an oil ring groove of a piston.

[0002]

2. Description of the Related Art There are two types of piston rings used in a four-cycle engine, a compression ring and an oil ring. The latter is composed of a spacer ring and a rail ring which is disposed above and below the spacer ring so as to be in contact with each other. It

As shown in FIG. 17, a piston ring assembling apparatus for assembling the above spacer ring to an oil ring of a piston has a magazine in which a large number of spacer rings 100 are slidably stacked and fitted in an expanded state. Part 200
And the spacer ring 1 fitted in the magazine section 200
A ring pushing means (not shown) for pushing up the entire 00 group is provided.

The piston 300, to which the spacer ring 100 is assembled, is fitted and arranged in a recess 201 formed on the upper surface of the magazine portion 200 with its top surface facing downward. The lower side surface 301a of the groove 301 is the upper end surface 2 of the magazine unit 200.
Located at the height of 02.

As shown in FIG. 18, each spacer ring 1
00 is the magazine unit 20 with half of them wrapped.
It is fitted with 0. Then, when all of them are pushed up by the ring pushing means, the uppermost spacer ring 100 is pushed out from the upper end of the magazine part 200 and shrink-fitted into the oil ring groove 301 of the piston 300 (see the chain double-dashed line). .

The piston 300 has ring grooves 302 and 3 for assembling the compression ring.
Also has 03.

The ring pushing means needs to stop the pushing operation when the spacer ring 100 is assembled in the oil ring groove 301. Therefore, in the related art, the contactor that operates by contacting the spacer ring 100 pushed up to the portion of the oil ring groove 301, the link mechanism that moves with the operation of the contactor, and the operation by the motion of the link mechanism. A ring assembling completion detecting means (not shown) including a switch element is provided, and the pushing operation of the ring pushing means is stopped when the assembling completion detecting signal is output from the switch element. .

[0008]

The assembly completion detecting means has a complicated structure because it uses a link mechanism, and the "rotation" of the rotary support portion of the link mechanism causes "rattle". However, there is a drawback that the switch element does not work.

Therefore, a light beam such as a laser beam is passed through the oil ring groove 301 so that the oil ring groove 30
It is conceivable to use a non-contact type assembling completion detecting means for detecting the interruption of the light beam by the spacer ring 100 attached to No. 1 by an optical sensor.

However, as shown in FIG. 18, in the conventional assembling apparatus, the upper half of the uppermost spacer ring 100 in the standby state protrudes from the upper end of the magazine section 200. The light beam may be blocked. Therefore, in the conventional assembling apparatus, it is difficult to adopt the non-contact type assembling completion detecting means.

SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to provide a piston ring assembling device which can stand by without causing the spacer ring to protrude from the upper end of the magazine section.

[0012]

SUMMARY OF THE INVENTION According to the present invention, a large number of spacer rings, which are constituent elements of an oil ring, are slidably stacked and fitted in an expanded state, and a piston head is provided in a recess formed in the upper surface. A magazine part for arranging the parts, and a ring push-up means for moving up the entire spacer ring stacked in the magazine part, and the uppermost spacer ring is moved from the upper end of the magazine part by the upward movement of the entire spacer ring. In a piston ring assembling device configured to be extruded to fit into the oil ring groove of the piston and to stop the ring lifting means at the time of fitting, the height of the overlapping portion of the spacer rings is increased. It is characterized in that a notched step portion having a step corresponding to the height is formed over the entire outer circumference of the upper end of the magazine portion.

[0013]

The uppermost spacer ring contracts and fits into the notched step portion provided in the magazine section when the upper end of the spacer ring located immediately below the spacer ring rises to the upper end of the magazine section. At that time, the portion of the spacer ring fitted in the notch step portion faces upward on the peripheral surface of the notch step portion due to the upward inertial force accompanying the pushing up of the spacer ring and the vibration at the time of fitting. Slides, and as a result, comes out from the upper end of the magazine section. The spacer ring that has slipped out from the top of the magazine fits into the oil ring groove of the piston due to its elastic contraction force, while the spacer ring to be assembled next stands by with its top positioned at the top of the magazine. Will be done.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As described above, there are two types of piston rings, a compression ring and an oil ring. As shown in FIG. 1, the oil ring has a structure in which a spacer ring 1 and rail rings (side rails) 2 that are arranged in contact with the upper surface and the lower surface of the spacer ring are combined.

The embodiment of the piston ring assembling apparatus of the present invention shown in FIG. 2 is applied to the assembling of the spacer ring 1 which is a component of the oil ring, and is composed of the magazine section 3 and the magazine section 3. And a drive unit 4 disposed in parallel with and adjacent to.

The magazine section 3 is a cylindrical guide member 5 and a cylindrical cup member 7 detachably connected to the upper portion of the guide body 5 via a connecting member 6 provided on the top of the guide body 5.
It consists of and. The guide body 5 and the cup member 7
Have the same diameter.

As shown in FIG. 3, which is an enlarged sectional view taken along line AA of FIG. 2, a key plate 8 is attached to the outside of the guide body 5 in a manner along the longitudinal direction of the guide body 5. .
The spacer rings 1 shown in FIG. 1 are fitted in the guide body 5 in a stacked manner. At that time, the key plates 8 are interposed at the mating openings 1a of the individual spacer rings 1. Therefore, the key plate 8 defines the direction of the ring 1 that is stacked and fitted on the guide body 5.

The outer diameter of the guide body 5 is larger than the inner diameter of the spacer ring 1 in the normal state, so that the spacer ring 1 fitted in the guide body 5 is forcedly expanded. .

As shown in FIG. 3, the cup member 7 has a locking hole 7a formed in the bottom surface and a recess 7b for disposing the piston 9 in the upper surface. Piston 9
Is a first ring groove 9a, a second ring groove 9b, and a third ring groove (oil ring groove) 9c in order from the top surface side.
Is formed, and the top surface thereof is placed in the concave portion 7b with the top surface facing downward.

As shown in FIG. 4, the locking hole 7a is composed of an opening having the same shape as the locking portion 6a of the connecting member 6 and a circular space located at the back of the opening. .
When connecting the cup member 7 to the guide body 5, the cup member 7 is placed on the guide body 5 in such a manner that the locking portion 6a is fitted into the locking hole 7a. Along with this, the locking portion 6a is positioned in the circular space of the locking hole 7a. Then, if the cup member 7 is rotated 90 degrees, the lower surface of the locking portion 6a is provided on both sides of the circular space. The bottom surface is engaged, and the cup member 5 is integrally connected to the guide body 5. When removing the cup member 7 from the guide body 5, the cup member 7 may be rotated 90 degrees to release the engagement of the engagement hole 7a with the engagement portion 6a.

As shown in FIGS. 5, 6 and 7, a key plate 10 having the same width as the key plate 8 is provided outside the cup member 7 so as to be positioned on an extension line of the key plate 8. . The key plate 10 has a groove 10a formed in the center of the outside along the longitudinal direction, and the upper end of the key plate 10 is divided into left and right by a slit 10b continuous with the groove 10a.

A tapered guide surface 10c is formed on the inner surface of the upper end of each divided upper end of the key plate 10, and each of the guide surfaces 10c is slit from the side end surface of the corresponding divided upper end. It is inclined so that it approaches the center side of the cup member 7 as it goes to the 10b side.

As shown in FIG. 7, the upper surface of the key plate 10 is located above the upper surface of the cup member 7 by a distance that is slightly shorter than the width of the oil ring groove 9c. Is located opposite to the oil ring groove 9c of the piston 9.

In the groove 10a and the slit 10b of the key plate 10, there is a beak-shaped claw piece 11a at the upper front end.
The swing plate 11 provided with is arranged. This swing plate 11 is a key plate 1 via a shaft 12.
It is rotatably supported at 0 and is urged by a spring 13 in the counterclockwise direction in FIG. Therefore, as shown in the same figure, the front surface of the lower end portion is always in contact with the cup member 7, and at this time, the claw piece 11a is located in the groove 10b of the key plate 10. . The claw pieces 11a are tapered on both side surfaces so that the width becomes narrower toward the tip.
Therefore, it has a tapered planar shape.

By the way, in this embodiment, a notch step portion 7c as shown in FIG. 8 is formed over the entire outer periphery of the upper end of the cup member 7. As shown in FIG. 9, in the spacer ring 1 group fitted to the cup member 7, their corrugated portions are wrapped in the height direction of the cup member 7, but the stepped portion of the notch step portion 7c is formed. Is set to the height d1 of the wrapped portion. The height d1 of the lap portion in this embodiment is approximately 1/2 of the thickness of the spacer ring 1 (dimension between the upper and lower ends).

The drive unit 4 shown in FIG. 2 includes a rear side plate 15 supported by a supporting means (not shown), and the rear side plate 15
Base plate 16 and rear side plate 15 supported by the lower end of the
Via a top plate 17 supported by the upper end of the base plate, a base plate 16 and a ball screw 18 rotatably supported by the top plate 17, a ball nut 19 screwed to the ball screw 18, and a coupling member 20. And a driving plate 22 integrally connected to the ball nut 19, a pusher member 23 disposed on the driving plate 22, and the like.

The tip of the base plate 16 projects outward from the front plate 24 of the drive unit 4, and the guide body 5 is supported by the projecting tip. That is,
In the guide body 5, after fitting the convex portion 5a formed on the bottom portion thereof into the hole 16a formed through the tip portion of the base plate 16, the nut 25 is attached to the screw portion 5b protruding below the convex portion 5a. It is fixedly supported on the base plate 16 by being fastened.

The tip of the drive plate 22 is also the front side plate 2 of the drive unit 4.
4, the tip portion has a bifurcated shape, as shown in FIG. 10 which is a sectional view taken along line BB of FIG.
Further, guide rods 26, 27 are provided at the base end of the drive plate 22.
When the ball screw 18 is rotated by the stepping motor 21, the drive plate 22
Moves vertically while being guided by these guide rods 26 and 27.

Next, the ring jump-up prevention portion 30 arranged above the guide body 5 will be described. As shown in FIG. 11, the jump-up prevention portion 30 includes a bracket 31 fixed to the drive portion 2 and cross-section members parallel to each other that are horizontally projected from both sides of the bracket 31 toward the upper side of the guide body 5. The guide rails 32 are shaped like a character, and the pressing plates 33 are inserted into the guide rails 32 at the left and right ends.

The pressing plate 33 has a piston insertion hole 33a formed through the central portion thereof, and as shown in FIG.
An annular pressing protrusion 33b is provided on the lower surface side along the peripheral surface of the piston insertion hole 33a.

A light projecting element 34A for projecting the light beam L1 and a light receiving element 34B for receiving the light beam L1 and a light projecting element 35A for projecting the light beam L2 and the light beam L2 are provided on the lower surface of the pressing plate 33. Light receiving element 35B for receiving light
And are provided.

As shown in FIG. 12, the light beam L1 projected from the light projecting element 34A passes near the upper end side of the cup member 7. Therefore, as shown in FIG. 9, when the spacer ring 1 is located at the upper end of the cup member 7, the light beam L1 is blocked by the spacer ring 1 and does not reach the light receiving element 34B. The light receiving element 34B is turned off.

On the other hand, since the light beam L2 projected from the light projecting element 35A passes through the oil ring groove 9c of the piston 9, when the spacer ring 1 is assembled in the oil ring groove 9c, the light beam is not emitted. This spacer ring 1
The light receiving element 35B is blocked by the light receiving element 35B and does not reach the light receiving element 35B.

As shown in FIGS. 11 and 12, the drive unit 2 supports a light projecting element 38A and a light receiving element 38B via brackets 36 and 37 extending to one side and the other side of the guide rail 32, respectively. .

The optical axis of each element 38A, 38B crosses above the piston insertion hole 33a. Therefore, in the state where the piston 9 is inserted into the piston insertion hole 33a as shown in FIG. 3, the projection beam of the light projecting element 38A is blocked by the piston 9 and does not reach the light receiving element 38B. The light receiving element 38B is turned off.

The bracket 36 is also provided with an air cylinder 39. In this air cylinder 39, a pressing member 39a attached to the tip of the piston rod is located behind the swing plate 11.

As shown in FIG. 3, the pressing plate 3 is
A space d2 is formed between the lower surface of the protrusion 33b of No. 3 and the upper surface of the cup member 7, and this space d2 is slightly larger than the thickness of the spacer ring 1.

The operation of this embodiment will be described below. When assembling the spacer ring 1 into the oil ring groove 9c of the piston 9 using the apparatus of this embodiment, the cup member 7 is removed from the guide body 5, and then the piston ring 1 is stacked and fitted on the guide body 5. To do. Then, after the cup member 7 is attached to the guide body 5 again, as shown in FIG. 3, the head of the piston 9 is placed in the concave portion 7b of the cup member 7 through the piston insertion hole 33a of the pressing plate 33.

When the piston 9 is placed, as described above, the light receiving element 38 provided corresponding to the light projecting element 38A.
B turns off. Therefore, based on the OFF signal of the light receiving element 38B, a control unit (not shown) switches the solenoid valve (not shown) to extend the air cylinder 39.

When the air cylinder 39 is extended, the rear end surface of the swing plate 11 is pushed by the pushing member 39a. As a result, the swing plate 11 swings from the position shown in FIG. 14 to the position shown in FIG. 15 against the spring 13, and the claw piece 11 a of the swing plate 11 moves to the oil ring groove 9 of the piston 9.
Move forward within c.

Next, the control section determines whether or not the spacer ring 1 is present at the upper edge of the cup member 7 based on the output of the light receiving element 34B shown in FIG. The pulse motor 21 shown in FIG. 2 is driven at a high speed to drive the drive plate 22 until the existence thereof is determined.
Is moved upward, and as a result, the entire group of spacer rings 1 stacked on the pusher member 23 is quickly moved upward along the guide body 5.

Then, the control unit controls the pulse motor 2 when the light receiving element 34B detects the uppermost spacer ring 1.
1 is reduced, which reduces the upward movement speed of the spacer ring group 1.

When the uppermost spacer ring 1 moves up to the position shown by the chain double-dashed line in FIG. 9, that is, when the upper half of the spacer ring 1 moves up to the position protruding from the upper end of the cup member 7, the lower half of the spacer ring 1 moves to the cup member 7. The cutout stepped portion 7c provided is shrink-fitted.

At this time, the spacer ring 1 fitted to the stepped portion 7c is subject to an upward inertial force associated with pushing up and vibration associated with fitting, so that the spacer ring 1 is cut off. Instead of stopping at the notched stepped portion 7c, the peripheral surface of the stepped portion 7c slides upward, and as a result, the cup member 7 comes out from the upper end.

After that, the spacer ring 1 is fitted with a gap 1a.
Each end portion (see FIG. 1) is elastically contracted while being guided by the tapered guide surface 10c of the key plate 10 shown in FIG. 5, and eventually fitted into the oil ring groove 9c. At this time, the claw pieces 11a are interposed between the mating end portions of the spacer ring 1, and therefore there is no fear that the mating end portions will overlap with each other as shown in FIG.

By the way, when the spacer ring 1 is fitted into the oil ring groove 9c as described above,
The spacer ring 1 to be assembled next has a cup member 7 at its upper end surface, as shown by hatching in FIG.
Located at the top of. That is, the cup member 7 is positioned so as not to protrude from the upper end of the cup member 7.

Therefore, the light beam L2 shown in FIG.
Spacer ring 1 to be assembled next in the passage of
As a result, the light beam L2 is blocked by only the spacer ring 1 fitted in the oil ring groove 9c.

When the light beam L2 is blocked, the light receiving element 35B shown in the figure is turned off. Therefore, the control unit controls the spacer ring 1 based on the OFF signal of the light receiving element 35B.
Is determined to be completed, and at that time, the solenoid valve is switched to cause the cylinder 39 to retract.

As a result, the swing plate 11 is rotated in the counterclockwise direction in FIG. 3 by the tensile force of the spring 13, and as shown in FIG.
Comes out of the oil ring groove 9c.

On the other hand, the control section stops the pulse motor 21 based on the OFF signal of the light receiving element 35B. Therefore, the spacer ring 1 to be assembled next
Stands by while not protruding from the upper end of the cup member 7.

By the way, the spacer ring 1 extruded from the upper end of the cup member 7 receives an upward biasing force due to the inertia and the like involved in the extruding, so that it is attempted to jump upward from the position of the oil ring groove 9c. However, in this embodiment, since the jump-up preventing portion 30 is provided, the ring 1 is prevented from jumping excessively.

That is, as is apparent from FIG. 3, when the ring 1 tries to jump up above the position of the ring groove 9c, the upper surface of the ring 1 comes into contact with the lower surface of the pressing projection 33b. The jump is surely prevented.

The piston 9 which has completed the assembly of the spacer ring 1 is carried out from the cup member 7 by a robot (not shown), and a new piston 9 is then placed on the cup member 7 by the robot.

After that, the above-mentioned assembling operation is repeated, and with this, the pusher member 23 shown in FIG. 2 gradually approaches the cup member 7. When the pusher member 23 moves up to near the upper end of the cup member 7, that is, when the lowermost piston ring 21 is pushed out from the upper surface, the dog 50 attached to the drive plate 22 shown in FIG. The detection limit switch 51 is turned on.

Therefore, the control unit controls the limit switch 5
Based on the ON signal of 1, the alarm means such as a lamp and a buzzer is activated to notify the outside that the stock amount of the spacer ring 1 in the magazine section 3 has become zero, and
The motor 21 is reversely operated to lower the drive plate 22 to the lower end position. The descending end position is detected by a limit switch (not shown) that is turned on by the dog 50.

When the apparatus of the above embodiment is applied to pistons of different standards (models), it is necessary to use a press plate 33 of the jump-up preventing portion 30 that is suitable for the piston. For example, this can be dealt with only by replacing the pressing plate 33.

That is, the pressing plate 33 is fixed to the bracket 31 by fitting the pin 40 shown in FIG. 11 into the pin hole 41 shown in FIG.
With pulling out, pull in the direction opposite to the drive unit 2,
As shown by the broken line in FIG. 11, it can be extracted along the guide rail 32.

In this way, the pressing plate 33 is attached to the bracket 3
Since it is detachable with respect to 1, if a plurality of pressing plates 53 to be applied to pistons of different standards are prepared in advance, the pistons can be changed in standard by selectively mounting them on the bracket 31. be able to.

[0059]

According to the present invention, the spacer ring can be made to stand by without protruding from the upper end of the magazine portion. Therefore, when the light beam is passed through the oil ring groove, the light beam is not blocked by the waiting spacer ring, and as a result, the completion of the spacer ring assembly is detected based on the blocking of the light beam. It is possible to employ a non-contact type assembly completion detecting means.

[Brief description of drawings]

FIG. 1 is a perspective view showing a spacer ring and a rail ring that form an oil ring.

FIG. 2 is a sectional view showing the outer appearance of an embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view showing the structure of a locking hole formed in the cup member.

FIG. 5 is a perspective view showing the structure of a key plate.

FIG. 6 is a perspective view showing a shape and a mounting mode of a swing plate.

FIG. 7 is a side view showing an arrangement mode of a key plate and a swing plate.

FIG. 8 is a partially enlarged vertical sectional view showing the operation of the embodiment.

FIG. 9 is a partially enlarged side view showing a stacking mode of spacer rings.

10 is a sectional view taken along line BB of FIG.

FIG. 11 is a perspective view showing a structure of a jump-up preventing portion.

FIG. 12 is a plan view of a jump-up prevention portion.

FIG. 13 is a perspective view showing the lower surface of the pressing plate.

FIG. 14 is a conceptual diagram showing a state where the claw pieces of the swing plate are retracted.

FIG. 15 is a conceptual diagram showing a state where a claw piece of a swing plate is moving forward.

FIG. 16 is a conceptual diagram showing a state in which the respective mating end portions of the spacer ring overlap each other.

FIG. 17 is a partially enlarged vertical sectional view showing the operation of the conventional device.

FIG. 18 is a partially enlarged side view showing a stacking mode of spacer rings in a conventional device.

[Explanation of symbols]

 1 spacer ring 3 magazine part 4 drive part 5 guide body 6 connecting member 7 cup member 7c notch step part 8 key plate 9 piston 9c oil ring groove 10 key plate 11 swing plate 11a claw piece 22 drive plate 23 pusher member 30 jumping prevention Part 33 Presser plate 39 Air cylinder

Claims (1)

[Claims] 1. A magazine section in which a large number of spacer rings, which are constituent elements of an oil ring, are slidably stacked and fitted in an expanded state, and a head of a piston is arranged in a recess formed in an upper surface, A ring push-up means for moving up the entire spacer ring stacked in the magazine part, and the uppermost spacer ring is pushed out from the upper end of the magazine part by the upward movement of the entire spacer ring to cause the oil ring groove of the piston. In the piston ring assembling device configured to be engaged with the spacer ring and to stop the ring pushing-up means at the time of the fitting, there is a step corresponding to the height of the overlapping portions of the spacer rings. A piston ring assembling apparatus, wherein a notch step portion is formed over the entire outer circumference of the upper end of the magazine portion.