JPH03130515A - Oil supply device for two-cycle engine - Google Patents

Abstract

PURPOSE:To perform supply of oil neither more nor less corresponding to an engine speed by correction-controlling an operating amount of an electrostrictive vibrating oil pump, which supplies lubricating oil to an engine, in accordance with a detection value of the engine speed. 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 oscillating circuit 23 thus to reciprocate a diaphragm 18 with the volume of a pump chamber 17 changed, performs delivery action. Further the oscillating circuit 23 is drive-controlled being based on a detection signal from a CDI system ignition device 28 by a driving circuit 25 of a control means 24. Here a detection signal from an engine speed detecting circuit 34 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 an engine speed to properly control an oil consumption amount.

Description

DETAILED DESCRIPTION OF THE INVENTION A1 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 In the conventional system described above, lubricating oil is pumped into two parts using an electromagnetic pump.
The electromagnetic pump is supplied to a cycle engine, and the amount of operation of the electromagnetic pump is made to be simply proportional to the engine speed.

However, the electromagnetic pump not only consumes relatively large amount of power, but also discharges a large amount per pump, making it difficult to keep up with sudden changes in the operation of the two-stroke engine. In addition, because the discharge amount is simply proportional to the engine speed, the amount of lubricating oil tends to be excessive in the low speed range, resulting in white smoke in the exhaust gas and oil dripping from the exhaust pipe. may occur.

The present invention has been made in view of the above circumstances, and makes it possible to reduce power consumption and follow sudden changes in 2-cycle engine operation, and also to supply lubricating oil that matches the engine speed. The object of the present invention is to provide an oil supply device for a two-stroke engine.

B8 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, a rotation speed detector for detecting the engine rotation speed. , and control means for correcting the operating amount of the oil pump according to the detected value of the rotation speed detector.

(2) Effect According to the above configuration, power consumption can be reduced by using the electrostrictive resonator oil pump, and since the electrostrictive resonator oil pump has a small discharge amount per operation, it is possible to reduce the power consumption by using the electrostrictive resonator oil pump. It becomes possible to follow sudden changes in Furthermore, by correcting the operating amount of the electrostrictive oil pump according to the engine speed, it is possible to supply lubricating oil that matches the engine speed.

(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 boat 6 is provided on the side of the crankcase 1.
An intake pipe 7 is connected to the intake boat 6.

Furthermore, a board valve 8 is provided on the intake boat 6. Further, an exhaust boat 9 is disposed 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 serving as an electrically operated oil pump 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,
A diaphragm 18 that divides the inside of the casing 15 into a spring chamber 16 and a pump chamber 17, an electrostrictive vibrator 19 attached to the diaphragm 18, and an electrostrictive vibrator 19 inside the spring chamber 16 to bias the diaphragm 18 toward the pump chamber 17. Retracted splash 2
0. Therefore, the diaphragm 18 is
The periphery of the spring 20 is sandwiched between the casing 15 in an insulated state, and a conductive material 40 is interposed between the spring 20 and the casing 15.

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 18 to repeat a state in which it is bent toward the bomb chamber 17 and a state in which it is deflected 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 operates to discharge oil. do.

The operating amount of the electrostrictive vibrator type oil pump 11 is controlled by a control means 24 configured by a microcomputer, and this control means 24 includes a drive circuit 25 that drives an oscillation circuit 23 and a drive circuit 25 that drives an oscillation circuit 23 . The drive circuit 25 includes a correction circuit 26 that corrects the drive signal from the
ACG2? A signal corresponding to the ignition timing of the spark plug 29 is input from the CDI ignition device 28 connected to the ignition device 28 . 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 rotation speed detector 30 for detecting the rotation speed of the two-stroke engine E is connected to the correction circuit 26. This rotation speed detector 30 has a plurality of pawls 31a spaced at equal intervals in the circumferential direction, and includes a rotor 31 that rotates in synchronization with the rotation of a crankshaft 32 in a two-stroke engine E, and a magnetic pickup 33 that detects the pawls 31a. and an engine rotation speed detection circuit 34 that outputs the engine rotation speed according to the rotation angle position signal of the crankshaft 32 inputted from the magnetic pickup 33.
The output signal of the engine rotation speed detection circuit 34 is input to the correction circuit 26.

The correction circuit 26 inputs a correction signal to the drive circuit 25 according to the value detected by the rotation speed detector 30. That is, the drive circuit 25 generates a drive signal that makes the discharge amount of the electrostrictive resonator oil pump 11 proportional to the engine speed, as shown by straight line A in FIG. This is given to the oscillation circuit 23, and a correction signal from the correction circuit 26 adjusts the discharge amount in the low rotation range according to the engine rotation speed detected by the rotation speed detector 30, as shown by curve B in FIG. A drive signal corrected to increase the ejection amount in a small and high rotation range is applied to the oscillation circuit 23.

In the above correction, at least one of the correction of the number of oscillations of the oscillation circuit 23 and the correction of the drive voltage may be performed, and when both corrections are performed, priority is given to correction of the number of oscillations.

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 by curve B in FIG. 2 according to the engine speed. Therefore, if the amount of lubricating oil supplied is too large when the engine speed is low, it is possible to prevent oil from dripping from the exhaust pipe or producing white smoke, and when the engine speed is high, the lubricating oil By increasing the supply amount to supply a sufficient amount of lubricating oil, it is possible to supply lubricating oil in just the right amount and in proportion to the engine speed.

In addition, by using the electrostrictive resonator oil pump 11 as a pump for supplying lubricating oil, power consumption can be reduced, and moreover, the electrostrictive resonator oil pump 11 has a discharge amount per one time. Since there are relatively few
The operation of the electrostrictive resonator oil pump 11 can be made to follow sudden changes in the operating state of the two-stroke engine E, allowing delicate adjustment of the oil discharge amount and more precise control of the oil supply amount. It becomes possible.

Effects of the C0 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;
Since it includes a rotation speed detector that detects the engine rotation speed and a control means that corrects the operating amount of the oil pump according to the detected value of the rotation speed detector, it is possible to reduce power consumption and It is possible to follow sudden changes in the operating condition of a cycle engine, and also to supply lubricating oil in just the right amount according to the engine speed.

[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... Rotation speed detector, E... 2-stroke engine Figure 2 Engine rotation speed

Claims (1)

[Claims] An electrostrictive vibrator type oil pump (11) for supplying lubricating oil to the two-stroke engine (E), a rotation speed detector (30) for detecting the engine rotation speed, and a rotation speed detector (30) for detecting the engine rotation speed. An oil supply device for a two-stroke engine, comprising: a control means (24) for correcting the operating amount of the oil pump (11) according to a detected value.