JPH07301110A - Lubricating oil feeding device for engine - Google Patents

Abstract

PURPOSE:To effectively utilize lubrication oil in a heat insulation tank by reducing incurring of the friction loss of an oil pump. CONSTITUTION:An oil pump 4, an oil cooler 5, a heat insulation tank 6, and an oil filter 7 are arranged, in the order, in a lubricating oil passage 3 through which lubricating oil is guided to the slide part of an engine 2. A pressure regulating valve 9 to keep a system pressure approximately at a constant value is arranged in a communication passage 8 to bypass the oil pump 4 and intercommunicate a heat insulation tank 6 and a lubricating oil passage 3. In a lubricating oil feeding device 1, since, when during the low temperature starting of the engine 2, the number of revolutions of the engine is high, the system pressure of the lubricating oil passage 3 is increased to a value higher than the set pressure of a pressure regulating valve 9, most of lubricating oil the heat of which is insulated in the heat insulation tank 6 is returned through the communication passage 8 to an upper stream lubricating oil passage 3 with the aid of the oil pump 4 and an amount of lubricating oil flowing from the heat insulation tank 6 to the engine 2 side is decreased to a very low value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine lubricating oil supply device provided with a heat retaining container in an engine lubricating oil circuit.

[0002]

2. Description of the Related Art Conventionally, in order to improve engine startability by reducing friction loss (friction loss) of an engine due to an increase in viscosity of lubricating oil in a cold region where the outside temperature is low or in winter, A lubricating oil supply device for supplying high-temperature lubricating oil to an engine has been devised (Shokai Sho 62
-160712). This lubricating oil supply device
As shown in FIG. 5, the lubricating oil passage 1 including the oil pump 100 is provided.
10 is equipped with a heat retention tank 120, and the high temperature lubricant oil is stored in the heat retention tank 120 when the engine is stopped, and the high temperature lubricant oil retained in the heat retention tank 120 is supplied to the engine 130 at the next engine start. It is a thing.

[0003]

In the above lubricating oil supply apparatus, the drain passage 140 communicating with the lubricating oil passage 110 is provided with the regulator valve 150 for keeping the system pressure constant. When the rotation speed is increased (therefore, the rotation speed of the oil pump 100 driven by the engine 130 is also high), the regulator valve 150 cannot be adjusted enough, and the system pressure P of the lubricating oil passage 110 exceeds the set pressure P1 of the regulator valve 150. (See FIG. 2).

For this reason, most of the lubricating oil pumped by the oil pump 100 flows back to the oil pan 160 through the drain passage 140, so that most of the lubricating oil kept warm in the heat retaining tank 120 flows to the engine 130 side. It becomes impossible to effectively use the high temperature lubricating oil.

Further, the friction loss of the oil pump 100 increases at low temperature when the viscosity of the lubricating oil becomes high. However, the conventional lubricating oil supply device does not take measures to reduce the friction loss of the oil pump 100. The present invention has been made based on the above circumstances, and an object of the present invention is to provide a lubricating oil supply device capable of effectively utilizing lubricating oil in a heat retaining tank in order to reduce friction loss of an oil pump. In offer.

[0006]

The present invention employs the following technical means in order to achieve the above object. Claim 1
Then, a lubricating oil passage that guides the lubricating oil from the oil tank that stores the lubricating oil to each sliding portion of the engine, and an oil that is interposed in this lubricating oil passage and that pumps the lubricating oil from the oil tank and pumps it to each sliding portion. A pump, a heat retaining container interposed in the lubricating oil passage downstream of the oil pump, capable of storing a predetermined amount of the lubricating oil pumped by the oil pump and keeping the temperature constant, and bypassing the oil pump. The communication container is provided with a communication passage that communicates the heat insulating container with the lubricating oil passage upstream of the oil pump, and an opening / closing valve that is interposed in the communication passage to open and close the communication passage.

According to a second aspect of the present invention, in the engine lubricating oil supply apparatus according to the first aspect, the on-off valve is a pressure regulating valve for maintaining the pressure downstream of the oil pump at a substantially constant pressure.

According to a third aspect of the present invention, in the engine lubricating oil supply apparatus according to the first aspect, an operating state detecting means for detecting an operating state of the engine and a control signal based on a detection signal of the operating state detecting means are output. And a control signal output means for controlling the opening / closing valve to change the valve opening degree according to the control signal output from the control signal output means.

According to a fourth aspect of the present invention, in the engine lubricating oil supply device according to any of the first to third aspects, a water-cooled oil cooler is provided between the oil pump and the heat retaining container in the lubricating oil passage. ing.

According to a fifth aspect of the present invention, in the engine lubricating oil supply device according to any of the first to fourth aspects, an oil filter is provided in the lubricating oil passage downstream of the heat retaining container.

[0011]

According to the lubricating oil supply apparatus of the present invention as defined in claim 1, a communication passage is provided, which bypasses the oil pump and communicates the heat-retaining container with the lubrication oil passage upstream of the oil pump. The communication passage can be opened and closed by the on-off valve. Therefore, when the on-off valve closes the communication passage, all the lubricating oil pumped up from the oil tank by the oil pump is supplied to each sliding part of the engine through the heat-retaining container, lubricates each sliding part, and then the oil tank again. Reflux to.

When the on-off valve opens the communication passage, the lubricating oil pumped up from the oil tank by the oil pump is diverted in the heat insulation container, and one is supplied to each sliding portion of the engine to move each sliding portion. After lubrication, it returns to the oil tank, and the other flows from the heat insulation container through the communication passage into the lubricating oil passage upstream of the oil pump.
It joins the lubricating oil pumped from the oil tank by the oil pump.

According to the second aspect, the pressure downstream of the oil pump can be kept substantially constant by the pressure adjusting valve.

According to the third aspect, the opening degree of the opening / closing valve is changed according to the detection signal output from the operating state detecting means. When the opening degree of the on-off valve becomes small, most of the high temperature lubricating oil stored in the heat insulation container is supplied to the engine side, and when the opening degree of the on-off valve becomes large, the heat insulation container Most of the high temperature lubricating oil stored in the oil will flow to the upstream side of the oil pump through the communication passage.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the engine lubricating oil supply system of the present invention will now be described with reference to FIGS. Figure 1
FIG. 3 is a schematic diagram showing a configuration of a lubricating oil supply device for an engine. The engine lubricating oil supply device 1 of the present embodiment (hereinafter, simply referred to as the lubricating oil supply device 1) includes a lubricating oil passage 3 for guiding lubricating oil to each sliding portion (not shown) of the engine 2, and the lubricating oil passage 3 An oil pump 4, an oil cooler 5, a heat retaining tank 6, an oil filter 7, and a communication passage 8 that bypasses the oil pump 4 and communicates the heat retaining tank 6 and the lubricating oil passage 3 with each other. The pressure adjusting valve 9 is provided. In addition,
Each sliding portion of the engine 2 that requires lubrication is a crank shaft, a cam shaft, a piston pin, a timing gear, a chain, a rocker arm, etc. (not shown).

In the lubricating oil passage 3, when the oil pump 4 is operated, the lubricating oil is pumped from the oil pan 10 (the oil tank of the present invention) for storing the lubricating oil toward each sliding portion of the engine 2. The lubricating oil that has flowed through the sliding parts of the engine 2 is returned to the oil pan 10 by being naturally dropped from the engine 2.

The oil pump 4 is driven by the engine 2 and pumps lubricating oil from the oil pan 10 and pumps it to the sliding parts of the engine 2. As the oil pump 4, an external gear pump, an internal gear pump, a trochoid pump or the like is used.

The oil cooler 5 cools the lubricating oil heated to a high temperature by receiving a heat load from the engine 2 in order to maintain a stable lubricating oil temperature for the engine 2.
It is provided downstream of the oil pump 4. The oil cooler 5 is roughly classified into an air cooling type and a water cooling type according to a cooling method. In this embodiment, a water cooling type using engine cooling water as a cooling medium is adopted.

The heat-retaining tank 6 is provided downstream of the oil cooler 5 and has a volume enough to store a predetermined amount of lubricating oil, and has a heat insulating property capable of keeping the lubricating oil stored therein for a long time. Have.

The oil filter 7 protects the engine 2 by removing solids contained in the lubricating oil supplied to the sliding parts of the engine 2 and keeping the lubricating oil clean at all times. The solids contained in the lubricating oil include wear metal powder generated by the abrasion of the sliding portion of the engine 2, deterioration of the lubricating oil, an oxidation product generated by aging, and incomplete combustion of the fuel and the lubricating oil. There is carbon etc.

The communication passage 8 is provided to connect the heat insulation tank 6 and the lubricating oil passage 3 upstream of the oil pump 4. The pressure regulating valve 9 keeps the system pressure P of the lubricating oil passage 3 substantially constant (about 4 to
6 kg / cm ² ), which opens when the pressure downstream of the oil pump 4 exceeds the set pressure P 1 (see FIG. 2).

The lubricating oil passage 3 has a bypass passage 11 for bypassing the oil cooler 5 and an oil filter 7.
A bypass path 12 that bypasses the bypass path 11 is provided.
Safety valves 13 and 14 for opening and closing 12 are provided. The safety valves 13 and 14 open when the oil cooler 5 and the oil filter 7 are clogged, respectively.

Next, the operation of this embodiment will be described. The lubricating oil pumped up from the oil pan 10 by the oil pump 4 is pressure-fed to each sliding portion of the engine 2 through the lubricating oil passage 3, lubricates each sliding portion, and flows to the oil pan 10 naturally. Fall back to reflux. After that, when the rotation of the oil pump 4 is stopped along with the stop of the engine 2, a predetermined amount of lubricating oil is stored in the heat retaining tank 6, and the temperature of the lubricating oil at that time is maintained for a long time. Therefore, at the next engine start, the lubricating oil kept warm in the warm tank 6 is supplied to each sliding portion of the engine 2, and the startability of the engine 2 can be improved even when the outside air temperature is low. it can.

However, when the engine speed is high at low temperature startup (that is, the speed of the oil pump 4 driven by the engine 2 is high), the pressure cannot be adjusted by the pressure adjusting valve 9, and the pressure adjustment valve 9 is shown in FIG. Thus, the system pressure P of the lubricating oil passage 3 rises above the set pressure P1. As a result, most of the lubricating oil in the heat retaining tank 6 flows back to the lubricating oil passage 3 through the communication passage 8, and the amount of lubricating oil flowing from the heat retaining tank 6 to the engine 2 side becomes extremely small.

Then, the lubricating oil flowing back from the communication passage 8 to the lubricating oil passage 3 merges with the lubricating oil pumped up from the oil pan 10 by the oil pump 4, flows through the lubricating oil passage 3 and flows into the heat retaining tank 6. Most of the lubricating oil from the heat retaining tank 6 flows back to the lubricating oil passage 3 through the communication passage 8. Therefore, most of the lubricating oil kept warm in the warm tank 6 gradually flows to the engine 2 side while circulating the oil pump 4 through the communication passage 8.

As described above, since the lubricating oil kept warm in the heat retaining tank 6 can be flown to the oil pump 4, the temperature of the lubricating oil passing through the oil pump 4 is the same as that of the lubricating oil pumped directly from the oil pan 10. The temperature becomes higher than the temperature, and as a result, the friction loss of the oil pump 4 at the time of low temperature starting can be reduced.

Further, in the present embodiment, the water-cooled oil cooler 5 is adopted. However, the water-cooled oil cooler 5 has a higher cooling water temperature than the lubricating oil temperature at the time of starting the engine. As a result, the lubricating oil is heated, which is effective for reducing the friction loss of the oil pump 4.

Next, a second embodiment of the present invention will be described. FIG. 3 is a schematic diagram of the lubricating oil supply device 1 according to the second embodiment. The lubricating oil supply system 1 of the present embodiment is provided with an electromagnetic opening / closing valve 15 for varying the valve opening degree, instead of the pressure adjusting valve 9 shown in the first embodiment, and the valve opening degree is controlled by the engine control device 16.
It is controlled by (control signal output means of the present invention).

The engine control device 16 includes a detecting means for detecting the operating state of the engine 2, specifically, an engine speed sensor 17 for detecting the engine speed, a pressure sensor 18 for detecting a pressure change in the intake pipe, and the like. The control signal is output to the electromagnetic on-off valve 15 in response to the detection signal of.

The control of the electromagnetic on-off valve 15 by the engine control device 16 is such that, for example, when the engine speed is high, the valve opening of the electromagnetic on-off valve 15 is reduced to keep the lubricating oil kept warm in the heat retaining tank 6. Is supplied to the engine 2 side, and when the intake negative pressure is high, the valve opening degree of the electromagnetic opening / closing valve 15 is increased so that most of the lubricating oil kept warm in the heat retaining tank 6 is supplied to the oil pump 4. Circulate. As a result, the lubricating oil that has been kept warm can be supplied to the heat-retaining tank 6 with priority given to the one with the larger friction loss of the engine 2 and the friction loss of the oil pump 4.

In addition to the detection signals of the engine speed sensor 17 and the pressure sensor 18, the engine control device 16 takes in detection signals of the lubricating oil temperature, the lubricating oil pressure, etc., to open the valve opening degree of the electromagnetic opening / closing valve 15. May be controlled.

[Modification] In this embodiment, the heat insulation tank 6 is arranged between the oil cooler 5 and the oil filter 7, but it may be located downstream of the oil pump 4. For example, as shown by the broken line in FIG. 4, it may be arranged downstream of the oil filter 7 or between the oil pump 4 and the oil cooler 5.

[0033]

The engine lubricating oil supply system of the present invention comprises:
When the system pressure in the lubricating oil passage increases at low temperature startup, the lubricating oil that had been kept warm in the heat retaining container can be flowed to the oil pump to reduce friction loss in the oil pump, so it was kept warm in the heat retaining container. Lubricating oil can be effectively used.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a lubricating oil supply device for an engine (first embodiment).

FIG. 2 is a graph showing pressure behavior in the engine.

FIG. 3 is a schematic diagram of a lubricating oil supply device according to a second embodiment.

FIG. 4 is a schematic view of a lubricating oil supply device showing a modified example.

FIG. 5 is a schematic diagram of a lubricating oil supply device according to a conventional technique.

[Explanation of symbols]

 1 Engine Lubricating Oil Supply Device 2 Engine 3 Lubricating Oil Path 4 Oil Pump 5 Oil Cooler 6 Insulation Tank (Insulation Container) 7 Oil Filter 8 Communication Passage 9 Pressure Control Valve (Open / Close Valve) 10 Oil Pan (Oil Tank) 15 Electromagnetic Open / Close Valve (Open / close valve) 16 Engine control device (control signal output means) 17 Engine speed sensor (operating state detecting means) 18 Pressure sensor (operating state detecting means)

Claims (5)

[Claims] 1. A) a lubricating oil passage for guiding lubricating oil from an oil tank for storing lubricating oil to each sliding portion of the engine; and b) a lubricating oil passage interposed in this lubricating oil passage for pumping the lubricating oil from the oil tank. An oil pump that pressure-feeds to the sliding portion; and c) a heat-insulating container that is interposed in the lubricating oil passage downstream of the oil pump and that can store a predetermined amount of the lubricant oil that is pressure-fed by the oil pump and keep it warm. And d) a communication passage that bypasses the oil pump and communicates the heat insulating container with the lubricating oil passage upstream of the oil pump, and e) opening and closing the communication passage by opening and closing the communication passage. A lubricating oil supply device for an engine equipped with a valve. 2. The engine lubricating oil supply system according to claim 1, wherein the on-off valve is a pressure regulating valve for maintaining a pressure downstream of the oil pump at a substantially constant pressure. Lubricating oil supply device. 3. The engine lubricating oil supply system according to claim 1, wherein an operating state detecting means for detecting an operating state of the engine, and a control signal for outputting a control signal based on the detection signal of the operating state detecting means. Output means, and the opening / closing valve changes the valve opening degree by a control signal output from the control signal output means. 4. The engine lubricating oil supply device according to claim 1, wherein a water-cooled oil cooler is provided between the oil pump and the heat retaining container in the lubricating oil passage. Characteristic engine lubricating oil supply device. 5. The engine lubricating oil supply apparatus according to claim 1, further comprising an oil filter provided downstream of the heat retaining container in the lubricating oil passage. apparatus.