JPH02163569A - Measurement of piston ring and device therefor - Google Patents

Abstract

PURPOSE:To improve the efficiency in the measurement of a piston ring and permit the correct measurement by measuring the dimension of abutment from the passing light quantity of laser beam at the abutment part of the piston ring fitted into a ring gauge and inspecting the existence of the leak of laser beam between the both edge parts during revolution. CONSTITUTION:A piston ring 2 is fitted into a ring gauge 1, and coaxially placed onto a turntable 4, and laser beam sources 8 and 9 and sensors 10 and 11 are set at the measurement positions. Then, the turntable 4 is turned, and when the sensor 10 detects the abutment part of the piston ring 2, an output signal corresponding to the light quantity of the passing laser beam is sent into a microcomputer, and the dimension of abutment is calculated. The output pulse of an encoder is counted, as the turntable 4 turns, and when the sensor 11 generates a light power, it is judged that the leak light is transmitted into between the edges of the ring gauge 1 and the piston ring 2, and the counted output at that time is taken into the microcomputer. Then, the dimension of abutment and the leak light data are displayed in a display part.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a total of 411 methods and devices for piston rings, and in particular to a method and apparatus for automatically, accurately, and easily performing piston link abutment dimensions and light leakage inspection. related to improvements.

[Summary of the invention] With the screw l-cylinder fitted into the ring cage,
A pair of I noser light sources and a sensor measure the amount of laser beam passing through the piston ring.
While rotating the screw 1-cylinder' and ring gauge, the light leakage between the edges of the two is measured using another pair of laser light sources and sensors, and the output signal of the sensor is processed by a microcomputer or the like. This is the method used to measure light leakage.

[Prior Art] As is well known, the screw 1 cylinder must be properly set in the engine cylinder, and for this reason, the following inspections have traditionally been carried out before piston rings are shipped from the factory. Ta.

That is, with the screw 1 to the cylinder fitted into a ring gauge having an inner diameter corresponding to the cylinder in which it is used, measure the dimensions of the abutment of the screw 1 ring, and measure the dimensions of the abutment between the screw 1 and the outer peripheral edge of the screw 1 ring. In order to determine whether there is a gap between the inner peripheral edges of the ring gauge, light leakage between both edges is inspected.

For this reason, conventionally, as shown in Fig. 6, a plurality of metal plates called thickness gauges S are prepared with slightly different thicknesses, and these are attached to a screw 1 fitted to a ring gauge. The size of the abutment was determined by inserting it into the abutment A of the ring 2 and selecting a thickness gauge that matched the size of the abutment based on the resistance during insertion.

In addition, the 1-memory light leakage test is performed in the darkroom section I]A as shown in Figure 7.
While rotating the C-ring gauge 1 and piston ring 2, the light from the lamp L is emitted from the back side of the C-ring gauge 1 and the piston ring 2 through the light projecting window W.
was irradiated through the lens, and the presence or absence of light leakage was visually inspected in front of it.

[Problems to be Solved by the Invention] However, since the conventional measuring method described above is performed manually, it is time-consuming and inefficient, and especially when measuring the abutment dimension, it is difficult to insert the sieve gauge. There was a problem with large individual differences because it depends on the human sense of whether it is loose or not. On the other hand, since light leakage testing is performed with the naked eye, there is also the problem of individual differences in accuracy, as with the aguchi.
Furthermore, it is difficult to accurately know from where to where the light leakage occurs around the outer circumference of the ring. Furthermore, processing of measurement data takes time, and the method for doing so has not been established.

[Objective of the Invention] The purpose of the present invention is to eliminate individual differences in piston ring abutment size measurement and light leakage inspection by automating piston ring measurement, and to improve measurement accuracy efficiently and easily. It's about trying.

[Means for Solving the Problems] In order to achieve the above object, the method of the present invention involves fitting a screw ring to a ring gauge, irradiating the abutment of the screw ring with a laser beam, and irradiating the abutment of the abutment. The amount of light passing through is the first
While rotating the ring gauge and piston ring, a laser beam is irradiated between the inner circumferential edge of the ring gauge and the outer circumferential edge of the piston ring to measure the total dimension by measuring with the sensor 1 of the sensor 1. The gist is to use the second sensor to check for the presence or absence of light leakage.

Further, in order to carry out the above method, the apparatus of the present invention includes a holding means for holding a ring gauge fitted with a piston ring, a first laser light source, a first sensor, and a second laser. a setting means for setting the light source and the second sensor at predetermined positions; a rotating means for rotating the holding means; and a setting means for rotating the holding means; The abutment dimension is calculated from the output signal generated by the first sensor in response to the amount of laser light from the first laser light source that passes through the abutment, and the abutment is rotated by the rotation means. In this state, the laser beam from the second laser light source is irradiated between the inner circumferential edge of the ring gauge and the outer circumferential edge of the piston ring. The present invention further comprises a control calculation means for detecting the light leakage from the output signal of the second sensor.

[Function] When the laser beam is irradiated onto the abutment of the screws 1 to 1, the sensor generates an output signal corresponding to the passing scene. Therefore, the output signal is processed and summed up.''
Seek the law.

Further, when a laser beam is irradiated while rotating the screw ring and the ring gauge, a sensor detects light leakage depending on the gap position angle between the two. A light leakage test is automatically performed based on the output signal and the rotation angle at that time.

[Example] The present invention will be described below with reference to the embodiments shown in the drawings.
FIG. 1 shows the overall configuration of an embodiment of an apparatus for implementing the piston ring measuring method of the present invention.

In the figure, A is a microcomputer, B is a display section thereof, C is a control section, and D is a measuring mechanism.

The measuring mechanism is configured as shown in FIGS. 2 and 3, for example.

In these figures, 3 is a case, 4 is a turntable, 5 is a rotational drive pulse motor, 6 and 7 are sensor mounting jigs, 8 and 9 are laser light sources, 10 and 11- are sensors, and 12 and 13 are guides. , 14 and 15 are origin sensors, 16 is a bearing, 17 and 19 are timing belts, and 18 is an encoder for detecting a rotation angle.

The turntable 4 is rotatably supported via a bearing 16 at the center of the upper surface of the case 3, and is rotationally driven by a pulse motor 5 via a timing bell 1-17.

A ring gauge with a piston ring 2 fitted thereon is placed concentrically on the turntable 4.

The sensor mounting jigs 6 and 7 consist of approximately U-shaped support members, with laser light sources 8 and 9 attached to their upper ends, and sensors "-" to their lower ends.

]1 is attached. The surface support members are fixed to slide parts 6a and 7a, respectively. slide part 6a,
7a is movably supported along guides 12 and 13.
For example, pulse motors 6b, 7b are built in, and the guides 12, 13 are, for example, slide bearings, and a feed screw that is interlocked with the slide pulse motors 6b, 7b is engaged with the slide bearings. encoder 18
is driven by a pulse motor 5 via a timing belt 19, and therefore the turntable 4
Detect the rotation angle.

The control section C consists of, for example, pulse motor drive units 20, 21, a comparator 22, an A/D converter 23, a counter 24, etc., as shown in FIG.

The pulse motor drive unit 20 drives the pulse motor 5 in response to commands from the microcomputer A to rotate forward, reverse, and stop. The output pulses of the encoder 18, which is driven by the pulse motor 5 in conjunction with the turntable 4, are sent to the counter 24, and the count output is input to the microcomputer A, which controls the turntable 4.
The rotation angle of is detected.

The pulse motor drive unit 21 operates the slide pulse motors 6b, 7b in response to instructions from the microcomputer A.
By simultaneously driving the sensor mounting jigs 6 and 7 to the left or right along the guides 12 and 13, the laser light sources 8 and 9 and the sensors 10 and 11 are moved to a predetermined measurement position.
or set the sensor mounting jigs 6 and 7 to the origin position. The microcomputer A can detect whether or not it is set at this origin position from the outputs of the origin sensors 14 and 15.

Next, a measuring method according to the present invention using the above-mentioned measuring device will be explained.

(i) First, set the sensor mounting jigs 6 and 7 to their original positions. This is detected by the origin sensor 14, 1.5.

(ji) Fit the piston ring 2 into the ring gauge 1-, and place the ring gauge 1 coaxially on the turntable 4.

(iii) Drive the pulse motors 6b and 7b once to move the sensor mounting jigs 6 and 7 along the guides 1 to 12.13, and set the laser light source 8.9 and the sensors 10 and 11 to the measurement position. This measurement position is set by the microcomputer A calculating the outer diameter of the ring and the distance from each origin.

(iv) Drive the pulse motor 5, rotate the turntable 4, and sensor] - If 〇 is screw 1 to ring 2]
When the portion 2a is detected, the drive of the pulse motor 5 is turned off and the turntable 4 is stopped.

(■) Since the stop of the turntable after detecting this joint 1" is slightly delayed from the time of detection by the sensor, there is a possibility that an error may occur if only the operation in (■i) is performed. To eliminate this error, the pulse motor It is preferable to reverse the turntable 4 by driving the turntable 5 slightly in the opposite direction, thereby reversing the delay in stopping. Therefore, the pulse motor 5 is driven one pulse at a time, the output of the sensor 10 is detected each time, and the turntable 4 is stopped at the position where the detected value is maximum.

(■j) When the abutment part 2a is detected, the output signal corresponding to the light intensity of the laser beam passing through the abutment part is converted into a digital signal by the A/D converter 23, and sent to the microcomputer A to calculate the abutment dimension. be done.

(■i) This abutment dimension can be measured, for example, on the abutment.

This is done in three locations: middle and bottom. Therefore, the pulse motor 5 is slightly moved so that the sensor 10 can detect the amount of passing light at three positions along the cut of the abutment portion 2a, and the minimum value at this time is taken as the abutment dimension.

(vii) Next, the microcomputer A resets the contents of the angle detection counter 24 to tLOIT.

(1) The pulse motor 5 is driven to rotate the turntable 4, and the output pulses of the encoder 18 are sent to the counter 24 and counted.

(x) At this time, when the sensor 11 generates an output, this output is sent to the comparator 22, and if it is greater than a predetermined value,
It is determined that there is light leakage, and the counter 24 at that time
The output of the counter I~ is taken into the microcomputer A.

(xi) When the turntable 4 rotates once and the abutment portion 2a is detected again by the sensor 10, the pulse motor 5
The turntable 4 is stopped by turning it off.

(xii) The abutment dimensions and light leakage data (angle) measured as described above are displayed on the screen of the display section B as shown in FIG.

FIG. 5 shows each actual operation step by the microcomputer A of the above-mentioned operation.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, piston ring measurement can be completely automated, efficiency is greatly improved, operation is easy, and individual differences among the measurers can be reduced. is removed, allowing accurate measurements.

It should be noted that the above-mentioned embodiments are merely examples, and it goes without saying that the method and apparatus of the present invention are not limited thereto.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, FIGS. 2 and 3 are schematic diagrams showing the measuring mechanism in the embodiment described above, and FIG. 4 is a display device in the embodiment described above. FIG. 5 is a flowchart showing each operation step of the microcomputer in the above embodiment,
FIGS. 6 and 7 are schematic diagrams showing a conventional piston ring abutment measurement and light leakage inspection method. A...Microcomputer, B...
・Display section, C... Control section, D...
・・Measuring mechanism, 1・・・・Ring gauge, 2・・・・
... Screws 1 to ring, 4 ... Turntable, 5 ... Rotation drive pulse motor, 6, 7 ...
・Sensor mounting jig, 8, 9... Laser light source, 10
．． 11...Sensor. Patent Applicant Nippon Bis1 Henling Co., Ltd. Agent Patent Attorney Nagai rI] Take Gobe ■ Cao Figure 6 (a) 1; Lingekeni 9 (b) Figure 7 (a) (b)

Claims (4)

[Claims] (1) Fit the piston ring to the ring gauge, irradiate the abutment part of the piston ring with a laser beam, and measure the amount of light passing through the abutment part with a first sensor to measure the abutment dimension, and the ring gauge and Measurement of a piston ring characterized by irradiating a laser beam between the inner circumferential edge of the ring gauge and the outer circumferential edge of the piston ring while rotating the piston ring, and inspecting the presence or absence of light leakage from between the two edges using a second sensor. Method. (2) The piston ring measuring method according to claim 1, characterized in that the abutment dimension is measured at a plurality of positions in the abutment portion, and the minimum measured value is taken as the abutment dimension. (3) Setting the piston ring and the holding means for holding the ring gauge fitted with the piston ring, the first laser light source and the first sensor, and the second laser light source and the second sensor at predetermined positions. a setting means; a rotation means for rotating the holding means; and a first abutment portion of the piston ring set by the rotation means to a set position of a first laser light source and a first sensor; The abutment dimension is calculated from the output signal generated by the first sensor in response to the amount of laser light from the laser light source, and the inner peripheral edge of the ring gauge and the piston are rotated by the rotating means. control calculation means for detecting the light leakage from the output signal of a second sensor in response to the light leakage between the outer peripheral edges of the ring due to irradiation of a laser beam from a second laser light source between the outer peripheral edges of the ring; A piston ring measuring device characterized by: (4) The control calculation means has an angle counting means and a display means, and the angle counting means counts the angle from the rotation start position to the light leakage position, and the display means displays the light leakage angle position. The piston ring measuring device according to claim 3, characterized in that the piston ring measuring device is configured as follows.