JP2000073727A - Oil detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil detection device which can detect that an oil is supplied from an oil pump toward a consumption part accurately, during an engine running. SOLUTION: An oil discharge passage 1 is divided to a primary side discharge passage 1A connecting to an oil pump P by a valve seat 3 and a secondary side discharge passage 1B connecting to a consumption part A. On the valve seat 3, a valve element 4 for releasing the valve seat 3 by receiving the pressure in the primary side discharge passage 1A is arranged and the free end of the other end 5B of a sheet spring member 5 supported by a cantilever is contacted to the upper end 4A of the valve element 4. An electric resistance strain gage 7 is arranged on the sheet spring member 5 and by the displacement sheet spring member 5 in response to the movement of the valve element 4, the oil flow in the oil discharge passage 1 is detected by the change of the electric resistance value outputted from the electric resistance strain gage 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply device for supplying oil in an oil tank to a consumer through an oil pump, for example, an inboard motor, an outboard motor, a watercraft, and the like. The present invention relates to an oil detection device of a fuel injection device in a two-cycle engine that supplies fuel containing oil to a two-cycle engine through a fuel injection valve.

[0002]

2. Description of the Related Art A two-stroke engine used on water is disclosed, for example, in Japanese Utility Model Laid-Open Publication No. 2-74565. According to this, the fuel in the fuel tank is pressurized by the first fuel pump and supplied to the vapor separator as the consuming part, and a constant fuel level is formed in the vapor separator by the constant liquid level control mechanism. Is done. The oil in the oil tank is pressurized by an oil pump and supplied to the steam separator. Therefore, a mixed oil of fuel and oil is formed in the steam separator. On the other hand, the mixed oil stored in the steam separator is:
The pressure is increased by the second fuel pump, supplied to the fuel distribution pipe, and injected and supplied to the two-cycle engine via a fuel injection valve mounted on the fuel distribution pipe. Here, an oil sensor (for example, a liquid level detection switch) for confirming the presence or absence of oil in the oil tank is attached to the oil tank, so that the remaining amount of oil in the oil tank has decreased. At times, a warning is issued from the oil sensor.

[0003]

According to such a conventional two-stroke engine, the oil sensor only detects the amount of oil in the oil tank, and the oil is actually supplied from the oil pump toward the consumption section. It does not have a function to confirm that For example, when the oil pump is stopped for any reason during operation, or when the oil discharge path is closed, a means for notifying the driver that oil is not supplied is provided. Not.

The present invention has been made in view of such a problem, and when the oil is no longer supplied from the oil pump to the consuming section, a warning is issued to the driver immediately to stop the oil supply. It is an object of the present invention to provide an oil detection device that can perform the operation.

[0005]

According to the present invention, there is provided an oil detecting apparatus for supplying oil in an oil tank to a consuming unit via an oil pump. And a valve seat that divides an oil discharge passage toward the primary discharge passage leading to the oil pump and a secondary discharge passage leading to the consuming portion, and a valve seat facing the secondary discharge passage. A valve body that moves so as to open a valve seat by receiving oil pressure in the next-side discharge path, a leaf spring member having one end fixed, and a free end at the other end contacting the valve body and being cantilevered; An electrical resistance strain gauge disposed on the leaf spring member, and the displacement of the leaf spring member accompanying the movement of the valve element causes a change in an electrical resistance value output from the electrical resistance strain gauge to cause the oil discharge path to move in the oil discharge path. Oil flow is detected. .

[0006]

When the oil pump is driven, the oil pump sucks the oil in the oil tank, raises the pressure, and discharges the oil into the oil discharge path. The pressurized oil in the primary discharge passage opens the valve body from the valve seat, and is supplied to the consumption unit via the secondary discharge passage. Here, when the valve body moves so that the valve seat is opened, the leaf spring member is displaced in synchronization with the valve body, whereby the electric resistance value output from the electric resistance strain gauge changes, Thus, it can be sensed that oil is being supplied in the oil discharge path toward the consumption unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an oil detector according to the present invention will be described below with reference to the drawings. T is an oil tank that stores oil therein. The oil in the oil tank T is pressurized by an oil pump P, and is discharged and supplied to the consuming unit A via an oil discharge path 1. B is an oil detection device, which consists of the following. Reference numeral 2 denotes a housing in which an oil discharge passage 1 is formed, and a valve seat 3 is formed in the oil discharge passage 1 in the housing. According to the above description, the oil discharge path 1 is divided at the valve seat 3 into the primary discharge path 1A connected to the oil pump P and the secondary discharge path 1B connected to the consumption unit A. 4 is a secondary discharge passage 1B in the housing 2 facing the valve seat 3.
Is a valve body movably disposed in the oil pump P
Is driven to increase the pressure in the primary side discharge path 1A,
The valve element 4 moves upward in the figure to open the valve seat 3. Reference numeral 5 denotes a leaf spring member arranged to abut on the upper end 4 </ b> A of the valve body 4, specifically, one end 5 of the leaf spring member 5.
A is sandwiched and fixed between the upper end 2A of the housing 2 and the cover 6, and the other end 5B is a free end and is the upper end 4A of the valve body 4.
Contacted. That is, the leaf spring member 5 is cantilevered between the upper end 2 </ b> A of the housing 2 and the cover 6. 7
It is an electric resistance strain gauge arranged on the leaf spring member 5, and the electric resistance strain gauge 7 is a publicly known one.
When strain is applied to an electric resistor, its resistance value changes,
An electric signal corresponding to the output is output.

Next, the operation will be described. When the engine is stopped, the oil pump P is not driven and is in a stopped state. According to the above, the primary side discharge path 1A
Since the oil pressurized by the oil pump P is not supplied to the inside, the valve body 4 is located at the lower position, and the contact surface on the lower end of the valve body 4 abuts on the valve seat 3 to hold the valve seat 3 closed. . On the other hand, when the valve element 4 closes the valve seat 3, the leaf spring member 5 abutting on the upper end 4 </ b> A of the valve element 4 is in a horizontal state as shown in the figure. According to the above, the electric resistance strain gauge 7
Outputs a reference electric resistance value, and the electric signal is, for example, E which gives a valve opening signal to a fuel injection valve.
This is input to a CU (not shown), and it can be detected that oil is not flowing in the oil discharge path 1.

On the other hand, when the oil pump P is driven along with the operation of the engine, the oil in the oil tank T becomes
The oil is sucked into the oil pump P and pressurized, and the pressurized oil is discharged into the oil discharge path 1 and goes to the valve seat 3 via the primary discharge path 1A. And, as mentioned above,
When the pressurized oil reaches the valve seat 3, an upward pressing force due to the oil pressure is applied to the contact surface at the lower end of the valve body 4. Since the pressure is higher than the pressure in the secondary discharge passage 1B, the valve element 4 moves upward in the figure, and the valve seat 3 is opened, whereby the oil in the primary discharge passage 1A is discharged from the secondary discharge passage 1A. After flowing into the road 1B, it is supplied to the consuming unit A thereafter.

Here, according to the upward movement of the valve body 4, the leaf spring member 5 is in a cantilevered support state, and its other end 5B, which is its free end, abuts on the upper end 4A of the valve body 4. It moves clockwise in the figure with reference to one end 5A that is cantilevered. According to the clockwise movement of the leaf spring member 5, the electric resistance value output from the electric resistance strain gauge 7 changes as compared with the electric resistance value output when the oil pump P stops. By inputting the changed electric resistance value to the ECU, it is possible to detect that the oil pump P is driven and the oil is flowing in the oil discharge path 1.

[0011]

As described above, according to the oil detecting device of the present invention, the oil discharge path from the oil pump to the consuming section is divided into a primary discharge path connected to the oil pump and a secondary discharge path connected to the consuming section. A valve seat that is divided into a passage, a valve body that faces the valve seat facing the secondary discharge passage, and moves so as to open the valve seat by receiving oil pressure in the primary discharge passage, and one end is fixed. A plate spring member having a free end at the other end abutting against the valve body and being cantilevered, and an electric resistance strain gauge disposed on the plate spring member, and a plate accompanying the movement of the valve body. Since the oil flow in the oil discharge path is detected by the change in the electric resistance value output from the electric resistance strain gauge due to the displacement of the spring member, it is extremely accurate that the oil is being supplied from the oil pump toward the consuming part. Can be detected. Further, as long as the oil detecting device is located in the oil discharge path, the oil detecting device can be provided with a high degree of freedom in mounting without any restriction on the position where the oil detecting device is disposed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part including an oil supply system showing an embodiment of an oil detection device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil discharge path 3 Valve seat 4 Valve element 5 Leaf spring member 7 Electric resistance strain gauge P Oil pump A Consumption part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01L 1/00 G01B 7/18 G

Claims (1)

[Claims] 1. An oil supply device for supplying oil in an oil tank to a consumption unit via an oil pump, wherein an oil discharge path 1 from an oil pump P to a consumption unit A is provided.
A primary discharge passage 1A connected to the oil pump P, and a consuming portion A
And a primary discharge passage 1A opposed to the valve seat 3 facing the secondary discharge passage.
A valve body 4 that moves so as to open the valve seat 3 by receiving the oil pressure therein, a leaf spring member 5 having one end 5A fixed and a free end of the other end 5B abutting against the valve body to be cantilevered. And an electric resistance strain gauge 7 disposed on the leaf spring member 5, wherein the displacement of the leaf spring member 5 accompanying the movement of the valve body 4
An oil detection device, wherein an oil flow in an oil discharge path 1 is detected by a change in an electric resistance value output from an electric resistance strain gauge 7.