JPH0890359A - Piston ring assembling device - Google Patents

Abstract

PURPOSE: To provide an assembling device of a piston ring which dispenses with the positioning work of a piston ring, and prevents the defective assembling. CONSTITUTION: A piston ring assembling device is provided with a sensor 41 to detect that a piston 30 is arranged at the top of a guide body 10, a sensor 43 to detect the vibration to be generated when a piston ring 60 is fitted to a ring groove of the piston 30, and a sequencer 50 which actuates a servo motor 26 based on the output of the sensor 41 and stops the servo motor 26 based on the output of the sensor 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a device for assembling a piston ring into a ring groove of a piston.

[0002]

2. Description of the Related Art This type of piston ring assembly device
A guide body that movably fits and holds a large number of piston rings in a stacked state, and a ring feed mechanism that pushes up the stacked piston rings as a whole are provided.

In this conventional assembling apparatus, the following work is carried out prior to assembling the piston ring. a. Set a prescribed number of piston rings on the guide body. b. The ring feed mechanism is manually operated, and the ring feed mechanism is stopped when the piston ring located at the uppermost stage is pushed out from the top end of the guide body.

By the work of the above-mentioned b, the upper surface of the piston ring which is first assembled is aligned with the upper surface of the top end of the guide body. After that, the ring feed mechanism pushes up the entire piston ring group by the thickness of one piston ring each time the piston is arranged at the top end of the guide body, and as a result, the piston ring located at the top is the top end of the guide body. It is extruded from and is fitted into the ring groove of the piston.

[0005]

The above-described conventional assembling apparatus has the following problems. The piston ring alignment work b described above is required. When the piston ring is replenished with the piston ring remaining in the guide body, the above-mentioned work b must be performed again. Due to the accumulation of thickness error existing in each piston ring, the piston ring may not be separated from the top end of the guide body, or two piston rings may be extruded from the top end at the same time.

[0006] In view of such circumstances, an object of the present invention is to provide:
An object of the present invention is to provide a piston ring assembling device that does not require piston ring alignment work and can prevent improper assembly.

[0007]

According to the present invention, there is provided a guide body for movably fitting and holding a large number of piston rings in a stacked state, and a ring feed mechanism for pushing up the stacked piston rings as a whole. In a piston ring assembling device for fitting the uppermost piston ring extruded from the top end of the guide body into the ring groove of the piston arranged at the top end, the piston is arranged at the top end of the guide body. Piston detection means for detecting
Vibration detection means for detecting vibration generated when the piston ring is fitted in the ring groove, and the ring feed mechanism is operated based on the output of the piston detection means, and based on the output of the vibration detection means. And a control means for stopping the ring feeding mechanism.

[0008]

When the piston is arranged at the top end of the guide body, the piston detecting means detects it. The control means is
The ring feed mechanism is operated based on the output of the piston detecting means, and as a result, the entire stacked piston rings are moved to the top end side of the guide body. After that, when the uppermost piston ring is fitted into the ring groove of the piston,
The vibration detection means detects the vibration generated at that time. Therefore, the control means stops the ring feed mechanism based on the output of the vibration detection means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

The embodiment shown in FIG. 1 has a cylindrical guide body 10.
And a ring feed mechanism 20. Guide body 10
Has a large-diameter head 11 and has a recess 12 for disposing the head of the piston 30 at the top end of the head 11.

The base portion of the guide body 10 is detachably fixed to a base body (not shown). Also,
The outer diameter of the large-diameter head 11 is set to be larger than the inner diameter of the piston ring 60 described later in the normal state, and the lower peripheral surface thereof is tapered.

The ring feed mechanism 20 includes a holder 21 loosely fitted to the guide body 10, an annular push-up member 22 supported by the holder 21 and slidably fitted to the guide body 10. A movable plate 24 connected to the holder 21 via a rod 23, a ball screw 25 screwed to the movable plate 24, and the ball screw 2
5 and a servo motor 26 for rotating 5.

The push-up member 22 is composed of a plurality of arc-shaped pieces connected in an annular manner and a spring (not shown) for urging these pieces toward the outer peripheral surface of the guide body 10. Therefore, the guide body 10 can be expanded radially outward. The push-up member 22 is used for the holder 2
It is accommodated in a recess 21 a provided on the upper surface of the first plate 1, and the annular plate 27 restricts the withdrawal from the recess 21 a.

A piston detection sensor 41 for detecting that the head of the piston 30 is disposed in the recess 12 is disposed near the recess 12 of the guide body 10, and the holder 2 is also provided.
A vibration detecting sensor 43 for detecting the vibration of the holder 21 is provided on the upper surface of the end portion of the holder 1. And the sensor 41
Is the sequencer 50, and the sensor 43 is the shaping amplifier 5
1 to the sequencer 50.

The sensor 41 is, for example, the piston 30.
A contact element that comes into contact with the top surface of the contact and moves downward, and a switch element that is closed as the contact element moves downward.

The operation of this embodiment will be described below.
As shown in FIG. 4, the piston 30 has a first ring groove 31, a second ring groove 32, and a third ring groove 33 formed sequentially from the top surface side thereof.
The depth of the recess 12 of the guide body 10 is set so that the piston ring 60 is assembled in the ring groove 33.

When assembling the piston ring 60 to the piston 30, a large number of piston rings 60 are stacked and fitted on the guide body 10 in advance as shown in FIG. In this state, when the piston 30 is placed in the concave portion 12 of the guide body 10 by means of a robot or the like, the sensor 41 detects this, and as a result, the detection signal shown in FIG. Is output.

FIG. 2 illustrates a ladder program executed by the sequencer 50. When the detection signal of the sensor 41 is input to the sequencer 50, the normally open contact X001 shown in the figure is closed, so that the on-delay timer T001 is started as shown in FIG. 3 (c). When the timer T001 completes measuring the set time t, the normally open contact of the timer T001 and the relay M002 shown in FIG.
Output relay Y001 is activated via the normally closed contact of
As a result, as shown in FIG. 3D, a drive signal for the servo motor 26 is output and the motor 26 rotates.

By the way, when the piston 30 is arranged,
The vibration generated by the impact at the time of the arrangement is the guide body 10.
And is transmitted to the holder 21 via the push-up member 22. Therefore, the vibration detection sensor 43 outputs a piston placement signal corresponding to the above vibration, and this signal is shaped and amplified by the shaping amplifier 51 as shown in FIG.

The set time t of the timer T001 is set to be slightly longer than the time during which the vibration associated with the arrangement of the piston 30 subsides.
Will be activated after the vibration has disappeared.

When the servo motor 26 is actuated, the ball screw 25 rotates to raise the holder 21 and the pushing-up member 22, and as a result, the piston ring 60 group on the member 22 is pushed up. At this time, the piston ring 6 positioned on the large-diameter head 11 of the guide body 10
0 is expanded by the head 11.

As the push-up member 22 rises, as shown by the dotted line in FIG. 5, when the uppermost piston ring 60 rises to a position beyond the top end of the guide body 10, the piston ring 60 separates from the top end, and The elastic contraction action fits into the third ring groove 33 of the piston 30.

At this time, the vibration generated by the impact due to this fitting is transmitted to the sensor 43 via the guide body 10, the piston ring 60, the pushing member 22 and the holder 21, and as a result, the shaping amplification section 51. A ring assembly signal corresponding to the vibration as shown in FIG. 3A is output.

As a result, the normally open contact X002 shown in FIG.
Is closed to activate the relay M002, and the relay M002 is kept in the operating state by the self-holding program composed of the normally open contact of the timer and the normally open contact of the relay M002 which are currently closed. To do.

When the relay M002 operates, its normally closed contact is opened and the relay Y001 is deenergized, so that the motor drive signal is turned off and the servomotor 26 is stopped as shown in FIG. 3 (d). Then, when the motor 26 is stopped, as shown in FIG. 4, the piston ring 60 to be assembled next is positioned at the top end of the guide body 10.

When the piston 30 having the piston ring 60 assembled is removed from the recess 12 of the guide body 10, the output of the piston detection sensor 41 disappears, so as shown in FIG. T001 is reset. Then, as the timer T001 is reset, the self-holding of the relay M002 is also released.

Thereafter, the ring feeding operation as described above is repeated every time the piston 30 is arranged in the recess 12 of the guide body 10. Then, when the sensor (not shown) detects that the ring stock amount of the guide body 10 has become zero, the motor 26 is reversely rotated and the holder 21 is moved down to a predetermined start position.

According to the above embodiment, the motor 26 is stopped at the time when the sensor 43 confirms that the piston ring 60 has been completely assembled, so that there is no possibility of a defective assembly. Further, since it is not necessary to align the piston ring 60 on the uppermost stage at the time of starting the assembling, the workability can be improved, and the piston ring 60 can be supplied to the guide body during the assembling work. .

In the above embodiment, the completion of the assembly of the piston ring 60 is detected by the vibration detecting sensor 43, but when the ring 60 is fitted in the ring groove 33,
Since air vibrations, that is, sound waves (impact sound) are generated, it is possible to use a sensor (microphone) that detects this sound wave instead of the sensor 43. In that case, the sound wave detection sensor uses the piston ring 60. It is desirable to install it in the vicinity of the assembly position.

The vibration detected by the sensor 43 or the sound detected by the sound wave detection sensor (air vibration)
Has a specific frequency characteristic, it is possible to perform more reliable assembly completion detection by processing the outputs of those sensors with an appropriate filter.

[0031]

According to the present invention, since it is not necessary to align the uppermost piston ring at the start of assembly, workability can be improved and the piston ring can be replenished during assembly. Is possible. Further, since there is no possibility that the piston ring will not be detached from the top end of the guide body or that two piston rings will be pushed out from the top end at the same time, a highly reliable assembling property can be obtained.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a ladder program executed by a sequencer.

FIG. 3 is a timing chart showing the operation of the embodiment.

FIG. 4 is a cross-sectional view showing how the piston ring is fitted to the guide body.

FIG. 5 is a cross-sectional view showing an assembly mode of a piston ring.

[Explanation of symbols]

 10 Guide Body 12 Recess 20 Ring Feed Mechanism 21 Holder 22 Pushing Up Member 26 Servo Motor 30 Piston 33 Ring Groove 41, 43 Sensor 50 Sequencer

Claims (1)

[Claims] 1. A guide body that movably fits and holds a large number of piston rings in a stacked state, and a ring feed mechanism that pushes up the entire stacked piston rings, and is extruded from the top end of the guide body. A piston ring assembling device for fitting the uppermost piston ring to the ring groove of the piston arranged at the top end, wherein piston detection means for detecting that the piston is arranged at the top end of the guide body, , A vibration detecting means for detecting a vibration generated when the piston ring is fitted in the ring groove, and the ring feeding mechanism is operated based on the output of the piston detecting means to output the vibration detecting means. And a control means for stopping the ring feed mechanism on the basis of the control means.