JPS639811A - Measuring instrument for wear quantity of cylinder liner - Google Patents

Abstract

PURPOSE:To obtain a device capable of measuring dimension continuously by fitting a wear sensor to a piston through the air outlet of a cylinder liner at the stop of an engine and taking a measurement while putting the engine in operation. CONSTITUTION:A crank shaft is turned to move the piston 4, the wear sensor 6 is fitted when the fitting recessed part 15 of the sensor 6 comes to the position of the air outlet 3, and a lead wire 9 is connected by a connector part 8. The tip projection part 14 of the sensor 6 slides along the wear part of the liner 2 by the movement of the piston 4, so the strain of a strain gauge 11 varies accordingly. Consequently, the wear quantity is measured and an wear curve is obtained on a recorder 10. Therefore, the measuring operation is performed continuously while the engine is put in operation without opening a cylinder cover; and the measurement time is shortened, the labor and cost are reducible, and the wear state is analyzed in detail.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for measuring the amount of wear on a cylinder liner of an engine having scavenging and exhaust holes.

(Prior Art) FIG. 6 is a sectional view around a piston of an internal combustion engine, and FIG. 7 is a diagram showing wear data of a cylinder liner according to a conventional method.

In FIG. 6, 01 indicates a cylinder liner, 03 indicates a piston, 04 indicates a piston ring, and 05 indicates a piston rod.

Inside the cylinder liner 02, the piston ring 05 seals the high-temperature, high-pressure gas and both sides of the piston ring 05 slide in close contact with each other. Therefore, depending on the back pressure conditions of the piston ring 04 and the corrosive atmosphere conditions, wear as shown in Fig. 7 occurs. . Accurately understanding the shape of such wear is an important issue in determining the causes and countermeasures for wear and in predicting the lifespan of cylinder liners.

(Problem to be solved by the invention) However, the conventional cylinder liner wear measurement method involves opening the cylinder cover, measuring the cylinder liner with an inner diameter gauge after death, and then restoring the cylinder cover. The drawback is that it takes a long time and a lot of manpower to perform measurements, including high costs.

Furthermore, since measurements are made intermittently in the axial direction of the cylinder liner using the inner diameter r-gear, a highly accurate wear curve cannot be obtained, and there is a drawback that the stepped state of the inner surface of the cylinder liner cannot be ascertained.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for measuring the amount of wear on a cylinder lie which eliminates the drawbacks of the conventional apparatus and is capable of continuously and accurately measuring dimensions.

(Means for Solving the Problem) The present invention utilizes the exhaust hole and scavenging hole of the cylinder liner to attach a wear sensor to the side of the piston when the engine is stopped, and also attaches a lead wire below the piston. It is designed to measure and obtain a continuous wear curve.

(Function) In the present invention, the wear sensor can be attached to or removed from the piston through the scavenging hole or exhaust hole of the cylinder liner, and the lead wire can also be attached or detached from below the piston, so the cylinder cover can be opened. It is now possible to measure cylinder liners without having to do so.

Also, it is possible to record and measure the amount of wear continuously in a short period of time while turning.

(Embodiment) Referring to Figs. 1 to 5 below, a sectional view of an apparatus according to an embodiment of the present invention, Fig. 3 is a view taken in the direction of the ■ arrow in Fig. 2, and Fig. 4 shows the mounting of the wear tolerance sensor. FIG. 5, which is a cross-sectional view of the piston section, is a wear amount measurement curve diagram using this device.

In Figure 1, 1 is the cylinder cover, 2 is the cylinder liner, and 3
is the scavenging hole of the cylinder liner, 4 is the piston, 5 is the piston ring, 6 is the wear sensor, 7 is the piston part lead wire,
8 is a lead wire connector, 9 is a lead wire, and 10 is a recorder.

In Figures 2 and 3, 11 is a strong gear, 12 is a terminal, and 13
is a mounting hole for the wear sensor 6, 14 is a convex part, in Fig. 4, 4 is a piston, 15 is a concave part, 1.6 is a screw hole, 17 is a terminal, 18 is an insulator, and 19 is a measurement lead. Line 20 is a blind hole after drilling.

When the piston 4 is turned and the wear sensor attachment part of the piston 4 is placed in the scavenging hole 3, the wear sensor 6 is attached to the piston 4 with a screw. Further, the lead wire 7 is embedded in the piston in advance, but the lead wire 9 for taking out from the piston 4 can be attached and detached via the lead wire connector 8.

The wear sensor 6 has a strength gauge 1 as shown in FIG.
The terminal 12 is exposed from one end of the side surface, and the cable wires other than the terminal are insulated. In addition, the wear sensor 6 has a hole 1 for attaching it to the piston 4.
3 is provided, and a protrusion 14 is provided at the portion that contacts the cylinder liner. FIG. 3 is a view taken in the direction of the ■ arrow in FIG.

FIG. 4 shows the piston portion to which the wear sensor 6 is attached, and the recessed portion 15 is provided with a screw hole 16 for attaching the wear sensor 6. Also provided is a terminal 17 that contacts the terminal 12 of the wear sensor 6. A measurement lead wire 19 is fixed inside the piston 4 using a heat-resistant insulator 18, and 20 indicates a blind portion after drilling.

Next, the operation of the above embodiment will be explained.

The crankshaft is turned, the piston 4 is moved, and when the recessed part 15 for attaching the wear sensor 6 comes to the position of the scavenging hole 3, the wear sensor 6 is attached and the lead wire 9 is connected with the connector part 8. As the piston 4 moves, the convex tip 14 of the wear sensor 6 slides along the worn part of the cylinder liner 2, so the strain of the strainage 11 changes accordingly, thereby continuously controlling the amount of wear. It can be measured.

FIG. 5 shows liner wear data obtained with the measuring device according to the present invention. Note that a plurality of wear sensors can also be used in the circumferential direction of the piston.

(Effects of the Invention) Since the cylinder liner wear measurement device of the present invention is configured as described above, measurement can be performed continuously while turning the engine without opening the cylinder cover of the engine.

Therefore, the measurement time can be significantly shortened compared to the conventional method, the number of manpower required for measurement can be reduced, and the cost required for measurement can also be significantly reduced. Furthermore, since wear in the longitudinal direction of the liner can be measured continuously, it is convenient for analyzing in detail the state of stepped wear on the cylinder liner and investigating its causes.

[Brief explanation of the drawing]

Fig. 1 is an equipment diagram of the cylinder liner wear measurement device according to the present invention, Fig. 2 is a detailed cross-sectional view of the cylinder liner wear sensor, Fig. 3 is a view in the direction of the ■ arrow in Fig. 2, and Figs.
Fig. 5 is a cross-sectional view of the piston part where the wear sensor is attached, Fig. 5 is a wear amount measurement curve diagram using this device, Figs. This is a picture of Todoroki. 2...Cylinder liner, 4...Piston, 6...
Wear sensor, 7...Lead wire. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A cylinder liner wear sensor is attached to the outer circumference of the piston, and a lead wire from the sensor is guided to the outside of the piston.
A cylinder liner wear measurement device that measures while turning the engine.