JPH03130514A - Oil supply device for two-cycle engine - Google Patents

Abstract

PURPOSE:To avoid a change of an oil delivery amount due to a change of viscosity following a temperature change of oil by correctioncontrolling an operating amount of an electrostrictive vibrating oil pump, which supplies lubricating oil to an engine, in accordance with a detection value of oil temperature. 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 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 by a driving circuit 25 of a control means 24 being based on a detection signal from a CDI system ignition device 28. Here a detection signal from an oil temperature detecting circuit 32 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 oil temperature to properly control an oil consumption amount.

Description

DETAILED DESCRIPTION OF THE INVENTION Δ1 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 depending only on the operating condition of the two-stroke engine. However, if the viscosity of lubricating oil changes in response to temperature changes, the amount of lubricating oil discharged from the oil pump will change even if the operating amount of the oil pump remains the same. Especially at low temperatures, the viscosity of lubricating oil will change. If the value increases, the amount of lubricating oil discharged will decrease.

The present invention has been made in view of the above circumstances, and provides a two-stroke engine that is capable of supplying a necessary amount of lubricating oil regardless of changes in the viscosity of the lubricating oil, thereby ensuring proper operation of the engine. The purpose is to provide an oil supply device.

B8 Structure of the Invention (1) Means for Solving the Problem The device of the present invention comprises an oil pump for supplying lubricating oil to a two-stroke engine, a temperature detector for detecting a temperature representative of the lubricating oil temperature, and a temperature detector for detecting a temperature representative of the lubricating oil temperature. and 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 lubricating oil temperature, and an appropriate amount of lubricating oil can always be supplied to the two-stroke engine.

(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.

Moreover, a closed valve 8 is disposed on the intake boat 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,
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. Spring 2 to be stored
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 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 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 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 input from the CDI ignition device 28 connected to the ACG 27 . That is, a drive signal basically corresponding to the ignition timing of the spark plug 29, that is, the engine rotational speed is inputted from the drive circuit 25 to the oscillation circuit 23.

The correction circuit 26 is connected to a temperature detector 30 that detects, for example, the temperature in the pump chamber 17 of the electrostrictive vibrator type oil pump 11 as a temperature representative of the lubricating oil temperature. The temperature detector 30 includes a temperature sensor 31 attached to the casing 15 of the electrostrictive resonator oil pump 11 facing the pump chamber 17, and a correction circuit that converts an analog signal from the temperature sensor 31 into a digital signal. The correction circuit 26 inputs a correction signal to the drive circuit 25 in accordance with the detected value by the temperature detector 30. That is, when the drive circuit 25 determines the operating amount of the electrostrictive resonator oil pump 11 depending only on the engine speed, as shown by the broken line in FIG.
A drive signal is given to the oscillation circuit 23 such that the discharge amount decreases as the viscosity increases when the lubricating oil temperature is below T1, but when the value detected by the temperature detector 30 is below the temperature T1. When this occurs, the electrostrictive vibrator type oil pump 11 is used to maintain a constant discharge amount as shown by the solid line in FIG.
A drive signal corrected to increase the amount of operation of the oscillation circuit 23 is provided 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 operating amount of the electrostrictive SvJ type oil pump 11 is changed as shown in FIG. 2 in accordance with the temperature representing the lubricating oil temperature. Therefore, the amount of lubricating oil supplied to the two-stroke engine E will not be insufficient due to an increase in the viscosity of the lubricating oil due to a decrease in the lubricating oil temperature, and an appropriate amount of lubricating oil will be supplied to the two-stroke engine E. be able to.

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 in the pump chamber 1 in the electrostrictive vibrator oil pump 11 is set as the temperature representative of the lubricating oil temperature.
Although the temperature of No. 7 is detected, the lubricating oil temperature may be represented by the outside air temperature.

C1 Effects of the Invention As described above, the device of the present invention includes an oil pump for supplying lubricating oil to a two-stroke engine, a temperature detector that detects a temperature representative of the lubricating oil temperature, and a detection value of the temperature detector. control means for correcting the operating amount of the oil pump in accordance with the change in temperature of the lubricating oil, it is possible to avoid as much as possible the change in the oil pump's discharge amount due to changes in viscosity caused by changes in the temperature of the lubricating oil, and to provide the two-stroke engine with an appropriate amount of oil. Can supply lubricating oil.

[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 oil pump. 11... Oil pump, 24... Control means, 30.
・・Temperature detector, E・2 cycle engine

Claims (1)

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