JPS63159730A - Cylinder lubricity evaluating device for piston engine - Google Patents

Abstract

PURPOSE:To accurately grasp the lubricity state among a cylinder, a piston, and a piston ring by transmitting an ultrasonic wave pulse from the outer peripheral surface of the cylinder corresponding to a piston ring sliding range to the inner peripheral surface in the passage period of the piston ring fitted to the piston. CONSTITUTION:A crank angle detector 74 sends an angle detection signal to a synchronizing device 73 for pulse generation timing control in the passage period of the piston ring 2 fitted to the piston 1 in reciprocal motion, and the device 73 sends a control signal to an ultrasonic wave pulse generating and transmitting circuit 72. At this time, an ultrasonic wave pulse signal is sent from the circuit 72 to the inner peripheral surface of a cylinder liner 3 through an ultrasonic wave transmitter 71. Further, an ultrasonic wave receiver 81 receives an ultrasonic wave pulse signal reflected by the inner peripheral surface of the cylinder liner 3 at this time and a receiving circuit 82 amplifies the ultrasonic pulse signal from the receiver 81. Then, a display device 83 displays the waveform of the ultrasonic wave pulse signal from the circuit 82.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cylinder lubrication evaluation device for a piston engine.

(Conventional technology).

Conventionally, in diesel engines, thermocouples embedded in the cylinder liner measure the temperature of the cylinder liner, which corresponds to the lubrication state of the sliding surfaces of the cylinder, piston, and piston ring. The lubrication condition with the ring was evaluated and the operating conditions and lubricant supply amount were controlled to prevent serious accidents and failures. Particularly in the piston scuffing and ring scuffing states, the temperature rise is large, so effective information can be obtained even when measurements are taken at a considerable distance from the target sliding surface.

(Problems to be Solved by the Invention) As in the conventional method, a thermocouple embedded in the cylinder liner measures the temperature of the cylinder liner corresponding to the lubrication state of the sliding surfaces of the cylinder, piston, and piston ring. When evaluating the lubrication state of the cylinder, piston, and piston ring based on the results, temperature generally has poor responsiveness and changes due to changes in engine load, etc.
There is not enough sensitivity to judge whether the lubrication condition is good or bad at the interface between the cylinder liner and the piston ring, or how much wear there is, so the amount of wear and the amount of lubricant are reduced.

There was a problem that it was not possible to carry out optimization.

(Means for Solving the Problems) The present invention addresses the above-mentioned problems, and, when the piston ring attached to the reciprocating piston passes, the cylinder is moved from the outer peripheral surface of the cylinder corresponding to the piston ring sliding range. It is characterized by comprising an ultrasonic pulse signal sending means for sending an ultrasonic pulse signal to the inner circumferential surface, and a display means for receiving, amplifying and displaying the ultrasonic pulse signal reflected from the inner surface of the cylinder. There is.

An object of the present invention is to provide an improved cylinder lubrication evaluation device for a piston engine that can accurately grasp the lubrication state of the cylinder, piston, and piston ring from time to time.

(Function) The cylinder lubrication evaluation device for a piston engine of the present invention is configured as described above, and when the piston ring attached to the reciprocating piston passes, the transmitter of the ultrasonic pulse signal transmitting means is connected to the inner peripheral surface of the cylinder. Send ultrasonic pulse signals to. At that time, some of the high-frequency ultrasonic pulse signals pass through the thin lidar and reach the sliding surface of the piston ring,
It then passes through the oil film and reaches the back of the piston ring.

It is reflected here, passes through the oil film part again, and returns to the wave receiver on the side of the first display means. Further, the remaining ultrasonic pulse signals transmitted from the wave transmitter of the ultrasonic pulse signal transmitting means to the inner circumferential surface of the cylinder are reflected by the sliding surface of the thin lidar and returned to the wave receiver on the display means side. The reflected waves of these returning ultrasonic pulse signals.

The strength changes depending on the sliding state of the piston ring and the thin liner and the state of the oil film, and this is amplified and displayed by the display means.

(Example) Next, the cylinder lubrication evaluation device for a piston engine of the present invention will be explained using an example shown in FIGS. 1 to 3.
The figure shows the piston and cylinder parts of a large crosshead diesel engine. In Figure 1, (1
) is the piston body, (2) is the piston ring, (3) is the cylinder liner, (4) is the cylinder cover, (5) is the exhaust valve, (6) is the fuel valve, (71) is the cylinder liner (3)
), (72) is the ultrasonic pulse generation/transmission circuit, (73) is the synchronizer for pulse generation timing control, (74) is the crank angle detector, and (81) is the cylinder liner. (3) An ultrasonic wave receiver that receives an ultrasonic pulse signal reflected from the inner peripheral surface (sliding surface) of (82), a receiving circuit that amplifies the signal received from the ultrasonic wave receiver (81), ( 83) is the same receiving circuit (8
This is a display unit that displays the signal from 2) in a waveform.

Next, the operation of the piston engine cylinder lubrication evaluation apparatus shown in FIGS. 1 to 3 will be explained in detail. When a crank angle detection signal is sent from the crank angle detector (74) to the pulse generation timing control synchronizer (73), the pulse generation timing control synchronizer (73) sends the pulse generation timing control synchronizer (73) to the ultrasonic pulse generation and transmission circuit (72). ), and at this time, an ultrasonic pulse signal is sent from the ultrasonic pulse generation/transmission circuit (72) to the inner peripheral surface (sliding surface) of the cylinder liner (3) via the ultrasonic wave transmitter (71). Sent. At this time, the ultrasonic receiver (81) receives an ultrasonic pulse signal reflected from the inner peripheral surface (sliding surface) of the cylinder liner (3).

Further, the receiving circuit (82) amplifies the ultrasonic pulse signal from the ultrasonic receiver (81), and the 9 display (82) displays the waveform of the ultrasonic pulse signal from the receiving circuit (82).

FIG. 2 shows the details of the ultrasonic wave transmitter (71) and the ultrasonic wave receiver (81), and when the piston ring (2) passes, the ultrasonic wave transmitter (71) moves from the piston ring (2) to the piston ring (2). ) sends out high-frequency ultrasonic pulse signals. At this time, some high frequency ultrasonic pulse signals.

Pass through the thin liner (3) and insert the piston ring (
2) reaches the sliding surface and further passes through the oil film.

It reaches the back of the piston ring (2) and is reflected there.

It passes through the oil film again and returns to the ultrasonic wave receiver (81). Also, from the ultrasonic transmitter (71) to the piston ring (
The remaining high-frequency ultrasonic pulse signal transmitted to the ultrasonic wave receiver (
81). At this time, the high frequency ultrasonic pulse signal sent out from the ultrasonic wave transmitter (71) at an intensity of (Lo) depends on the sliding condition and oil film condition between the piston ring (2) and the liner liner (3).

Since the ultrasonic wave receiver (81) changes to the state (R,) (RZ) (R3) and returns, the relative change causes the cylinder liner (3), piston (1) and piston ring ( 2) Evaluate the lubrication state with.

(A), (B), and (C) in FIG. 3 show the state of change. That is, if the intensity of the high-frequency ultrasonic pulse signal sent out from the ultrasonic transmitter (71) is (Io), and if the ultrasonic receiver (81) immediately receives it, then the intensity is (Ioo). ), the sliding surface between the thin liner (3) and the piston ring (2).

and the reflected wave from the back surface of the piston ring (2).

(R,)(R2)(R3) and the ultrasonic receiver (8
Enter 1). If the oil film is thick as shown in Figure 3 (A), the high frequency ultrasonic pulse signal will be as shown in (b).

A part of it is reflected on the sliding surface of the thin liner (3) (R1
), and some of it is also reflected from the sliding surface of the piston ring (2), resulting in (Rt), but a considerable amount of the high-frequency ultrasonic pulse signal passes through as is.

Reflected from the back of piston ring (2), (R3)
become. Note that if the piston ring (2) is not in the corresponding position, only (R1) will come out as shown in FIG. 3(A) (c). In addition, in the boundary lubrication state where wear occurs as shown in Figure 3 (B), the reflected wave (
R1) becomes slightly larger and becomes approximately the same size as the reflected wave (R1) that passes through the sliding part and is reflected from the back surface of the piston ring (2). In addition, when there is no oil film and the metal surfaces are in contact with each other, as in the case of abnormal wear shown in Fig. 3 (C), or in a scuffing state, (e) of Fig. 3 (C)
), the reflected wave (R1) becomes larger and the third reflected wave (RZ
)(R3) almost disappears.

The strength of these reflected waves is (R+/I oo) (R2/
T. ') (R3/I.') and (R3/1G'
)(R, /Io), etc., the sliding condition can be evaluated.

FIGS. 4(A), 4(B), and 4(C) show specific examples of this evaluation. In general, engine cylinder wear is shown in Figure 4 (
10% to 3% from the top dead center of the piston stroke as shown in B)
There are many positions where the top ring is compatible with 0%, and lubrication is the most difficult. Therefore, ultrasonic transducers (71) and (81) are provided on the outer peripheral surface of the cylinder liner corresponding to this position, and the lubrication state is evaluated under the most severe conditions of the oil film state of the engine. In addition to this ultrasonic transducer (71) (81),
If the transmitting/receiving element (711) (811) is installed near the center of the stroke where the piston speed is maximum, an ultrasonic reflection signal in a situation where the oil film is thick can be obtained and compared with the above case.

It becomes possible to accurately evaluate the lubrication state.

(Effects of the Invention) As described above, the cylinder lubrication evaluation device for a piston engine of the present invention applies ultrasonic waves from the transmitter of the ultrasonic pulse signal transmitting means to the inner circumferential surface of the cylinder when the piston ring attached to the reciprocating piston passes. Send a sonic pulse signal. At this time, some of the high-frequency ultrasonic pulse signals pass through the thin lidar, reach the sliding surface of the piston ring, and further pass through the oil film, reach the back surface of the piston ring, and are reflected there.

It passes through the oil film again and returns to the wave receiver on the display means side. Further, the remaining ultrasonic pulse signals transmitted from the wave transmitter of the ultrasonic pulse signal sending means to the inner peripheral surface of the cylinder are reflected by the sliding surface of the thin lidar and returned to the wave receiver on the one display means side. The reflected waves of these returning ultrasonic pulse signals are
The strength changes depending on the sliding condition and oil film condition between the piston ring and the cylinder liner, and this is amplified and displayed by the display means, so the lubrication condition between the cylinder, piston, and piston ring can be accurately checked moment by moment. There is an effect that can be grasped.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of the cylinder lubrication evaluation device for a piston engine according to the present invention, Fig. 2 is an explanatory diagram of the operation of the ultrasonic pulse signal transmitting means side wave transmitter and the display means side wave receiver, and Fig. 3 Figures (A), (B), and (C) are explanatory diagrams showing reflected waves that change depending on the sliding condition between the piston ring and the thin liner and the oil film condition. Figure 4 (A) shows the stroke where the transducer/receiver reaches the maximum piston speed. FIG. 4(B) is a side view showing another embodiment additionally installed near the center position, and FIG. 4(C) is an explanatory diagram showing the relationship between piston sliding speed and cylinder liner wear rate.
) is an explanatory diagram showing reflected waves in the same example. (1) Piston, (2) Piston ring. (3)...Cylinder liner, (71) to (74).
...Ultrasonic pulse signal sending means, (81) (82)
(83) ...display means. Sub-Agent Patent Attorney Okamoto (2 persons) Figure 1 Figure 3 (A) Figure 3 (C)

Claims (1)

[Claims] an ultrasonic pulse signal transmitting means for transmitting an ultrasonic pulse signal from the outer circumferential surface of the cylinder to the inner circumferential surface of the cylinder corresponding to the piston ring sliding range when the piston ring attached to the reciprocating piston passes; A cylinder lubrication evaluation device for a piston engine, comprising display means for receiving, amplifying and displaying reflected ultrasonic pulse signals.