JPH03130512A - Oil supply device for two-cycle engine - Google Patents

Abstract

PURPOSE:To reduce an oil consumption amount and to improve resistance against seizure with the oil consumption amount properly controlled by correction-controlling an operating amount of an electrostrictive vibrating oil pump for supplying lubricating oil to an engine in accordance with its temperature detection value. CONSTITUTION:A delivery port 12 of an electrostrictive vibrating oil pump 11 is connected to an oil delivery nozzle 10 arranged in an intake pipe 7 of an engine E. While the oil pump 11, in which its electrostrictive vibrator 19 is vibrated by a pulse signal from an oscillator circuit 23 thus to reciprocate a diaphragm 18 with the volume of a pump chamber 17 changed, performs delivery action. Further the oscillator circuit 23, being based on a detection signal from a CDI system ignition device 28 by a driving circuit 25 of a control means 24, is drive-controlled. Here a detection signal from a detecting circuit 32 of engine temperature is input to the driving circuit 25 through a correcting circuit 26. A delivery amount of the oil pump 11 is corrected in accordance with the engine temperature to properly obtain an oil consumption amount.

Description

DETAILED DESCRIPTION OF THE INVENTION A5 Object of the Invention (1) Field of Industrial Application The present invention relates to an oil supply device for a two-stroke engine.

(2) Prior Art Conventionally, an oil supply device for a two-stroke engine is known, for example, from Japanese Patent Application Laid-Open No. 62-78482.

(3) Problems to be Solved by the Invention Conventionally, in such oil supply devices, the discharge amount of the oil pump is generally changed in accordance with the rotation speed of the two-stroke engine. However, if the discharge amount is controlled solely by the engine speed, the amount of oil will be insufficient when the engine temperature is high, and the amount of oil will be excessive when the engine temperature is low, resulting in oil dripping from the exhaust pipe and white smoke from the exhaust gas. This may occur.

The present invention has been made in view of the above circumstances, and provides an oil supply device for a two-stroke engine that is capable of supplying an amount of oil suitable for the operating conditions of the engine, thereby optimizing oil consumption. The purpose is to

B1 Structure of the Invention (1) Means for Solving the Problems The device of the present invention comprises an electrostrictive vibrator oil pump for supplying lubricating oil to a two-stroke engine, and a temperature sensor for detecting a temperature representative of the engine temperature. and a control means for correcting the operating amount of the oil pump according to the detected value of the temperature detector.

(2) Effects According to the above configuration, the discharge amount of the oil pump can be corrected according to the engine temperature, and the oil consumption amount can be optimized.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, the engine body of a two-stroke engine E includes a crankcase 1 having a crank chamber 1a, and a cylinder having a cylinder hole 2a. A block 2 and a cylinder head 3 are connected in this order. A piston 4 is slidably fitted into the cylinder hole 2a, and a combustion chamber 5 is formed between the piston 4 and the cylinder head 3.

An intake port 6 is provided on the side of the crankcase l,
An intake pipe 7 is connected to the intake port 6.

Moreover, a bridge valve 8 is disposed in the intake port 6. Further, an exhaust port 9 is provided on the side of the cylinder block 2.

An oil discharge nozzle 10 is disposed in the middle of the intake pipe 7, and a discharge port 12 of an electrostrictive vibrator oil pump 11 is connected to this oil discharge nozzle 10. Further, a reservoir 14 for storing lubricating oil is connected to the suction port 13 of the electrostrictive vibrator type oil pump 11.

The electrostrictive resonator oil pump 11 includes a casing 15,
The inside of the casing 15 includes a spring chamber 16'J6 and a pump chamber 1.
a diaphragm 18 divided into 7 sections;
The pump includes an electrostrictive vibrator 19 attached to the pump, and a spring 20 housed in the spring chamber 6 to bias the diaphragm 1B toward the pump chamber 17. Therefore, diaphragm 18
is sandwiched between the casing 15 with its peripheral edge insulated, and there is also a conductive material 40 between the spring 20 and the casing 15.
is intervened.

Also, between the pump chamber 17 and the discharge port 12, the casing 15
A discharge valve 21 that allows only the flow of lubricating oil from the pump chamber 17 to the discharge port 12 is disposed in the pump chamber 17.
A suction valve 22 is provided in the casing 15 between the suction port 13 and the suction port 13 to allow only the flow of lubricating oil from the suction port 13 to the pump chamber 17 .

An oscillation circuit 23 is connected to the electrostrictive vibrator 19, and the electrostrictive vibrator 19 is activated by a pulse signal from the oscillation circuit 23.
vibrates, causing the diaphragm ■8 to repeat a state in which it bends toward the pump chamber 17 and a state in which it deflects toward the spring chamber 16. As a result, the volume of the pump chamber 17 increases and decreases, and the electrostrictive vibrator type oil pump 11 discharges. Operate.

The operating amount of the electrostrictive vibrator type oil pump 11 is controlled by a control means 24 composed of a microcomputer, and this control means 24 includes a drive circuit 25 that drives an oscillation circuit 23 and a The drive circuit 25 includes a correction circuit 26 that corrects the drive signal from the
A signal corresponding to the ignition timing of the spark plug 29 is manually generated from the CDI ignition device 28 connected to the ACG 27 . That is, from the drive circuit 25 to the oscillation circuit 23, a drive signal basically corresponding to the ignition timing of the spark plug 29, that is, the engine rotation speed is manually input.

A temperature detector 30 that detects, for example, the temperature of the crankcase 1 as a temperature representative of the engine temperature of the two-stroke engine E is connected to the correction circuit 26. This temperature detector 30 includes a temperature sensor 31 attached to the side of the crankcase 1 and a detection circuit 32 for converting an analog signal from the temperature sensor 31 into a digital signal and inputting it to the correction circuit 26. The correction circuit 2 manually outputs a correction signal to the drive circuit 25 in accordance with the detected value by the temperature detector 30. That is, under normal conditions, the drive circuit 25 supplies the oscillation circuit 23 with a drive signal that causes the discharge characteristics of the electrostrictive resonator oil pump 11 to be as shown by curve A in FIG. When the value detected by the temperature detector 30 is a high temperature, e.g., 80 degrees Celsius or higher, the discharge amount is larger than that shown by the curve B, and when the value detected by the temperature sensor 30 is a low temperature, e.g., 50 degrees Celsius or lower, At some point, as shown by curve C, a drive signal corrected so that the ejection amount is smaller than that shown by curve C is applied to the oscillation circuit 23.

Next, to explain the operation of this embodiment, the electrostrictive resonator oil pump 11 basically operates in accordance with the engine speed to supply lubricating oil to the two-stroke engine E. The oil supply amount is changed as shown in FIG. 2 in accordance with the temperature representative of the engine temperature.

Therefore, it is possible to prevent lubricating oil from being supplied too much when the engine temperature is low, resulting in oil dripping from the exhaust pipe or producing white smoke, or from insufficient lubricating oil when the engine temperature is high. It becomes possible to supply lubricating oil with just the right amount and shortage depending on the temperature.

Moreover, by using the electrostrictive vibrator type oil pump 11 as a pump for supplying lubricating oil, it is possible to finely adjust the oil discharge amount, and more precise oil supply amount control is possible.

In the above embodiment, the temperature of the crankcase 1 is detected as a representative temperature of the engine, but the temperature of the engine cooling water, the installation of the spark plug 29 is determined by the seat temperature, the temperature inside the combustion chamber 5, or the exhaust boat temperature. The engine temperature may be represented by the exhaust temperature or the like at 9.

Further, the discharge amount of the electrostrictive S-type oil pump 11 may be controlled by taking into consideration not only the temperature representing the engine temperature but also the rate of change of the temperature.

C1 Effects of the Invention As described above, the device of the present invention includes an electrostrictive vibrator type oil pump for supplying lubricating oil to a two-stroke engine;
a temperature detector that detects a temperature representative of engine temperature;
Since the control means corrects the operating amount of the oil pump according to the detected value of the temperature detector, it is possible to finely adjust the amount of lubricating oil supplied, and also adjust the amount of lubricating oil supplied according to the engine temperature. This can be changed to reduce lubricating oil consumption and improve resistance to seizure in a two-stroke engine.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram showing the overall configuration, and FIG. 2 is a discharge characteristic diagram of an electrostrictive vibrator type oil pump. DESCRIPTION OF SYMBOLS 11... Electrostrictive resonator type oil pump, 24... Control means, 30... Temperature detector, E... 2-cycle engine

Claims (1)

[Claims] An electrostrictive resonator oil pump (11) for supplying lubricating oil to the two-stroke engine (E), a temperature detector (30) that detects a temperature representative of the engine temperature, and the temperature detector (30) The oil pump (
11) A control means (24) for correcting the operating amount of the two-stroke engine.