JP3552946B2 - Internal combustion engine lubrication system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lubrication device for an internal combustion engine that supplies lubricating oil to various parts of the internal combustion engine.
[0002]
[Prior art]
In an internal combustion engine, lubricating oil (engine oil) is supplied to sliding parts such as a valve operating system that opens and closes intake and exhaust valves and a piston-crank system that drives a piston and a crankshaft. We are lubricating. In a very common internal combustion engine, lubricating oil is stored in an oil pan at the bottom of the engine, and each oil is slid through an oil gallery (oil holes for circulating oil) by an oil pump driven by rotation of a crankshaft. It is supplied to the moving part.
[0003]
[Problems to be solved by the invention]
Here, in the sliding portion of the valve train, an oil film is surely formed between the cam surface of the camshaft and the surface of the valve lifter (which may be the surface of the sliding portion of the rocker arm or the swing arm depending on the valve driving mechanism). It is desirable that a lubricating oil having a certain viscosity be supplied in order to form. If the viscosity is too high, friction increases, which is not preferable for valve driving. However, if the viscosity is too low, the oil film becomes too thin and the lubrication effect cannot be sufficiently obtained.
[0004]
On the other hand, in the piston / crank sliding part, it is necessary to form an oil film surely between the piston and the inner surface of the cylinder or between the inner peripheral surface of the connecting rod and the outer peripheral surface of the crankshaft. The same as in the section. However, in the piston / crank sliding part, it is important that the reciprocating motion of the piston and the rotating motion of the crankshaft be performed at high speed and smoothly. If the viscosity of the lubricating oil is high, it will act as friction. -The optimal viscosity of the lubricating oil for the sliding portion of the crank system is lower than the optimal viscosity of the lubricating oil for the sliding portion of the valve train.
[0005]
As described above, the optimum viscosity required for the lubricating oil differs for each sliding portion. In a conventional lubricating device, the viscosity of the lubricating oil is set to a value that does not cause any problem in any sliding portion, and there is no problem with this configuration. However, the present invention aims at further advanced operation of the internal combustion engine, and is intended to supply lubricating oil having an optimum viscosity to each sliding portion.
[0006]
Therefore, an object of the present invention is to provide a lubricating device for an internal combustion engine that supplies a lubricating oil having an optimum viscosity to each sliding portion of the internal combustion engine and realizes a more advanced operation of the internal combustion engine.
[0007]
[Means for Solving the Problems]
The lubricating device for an internal combustion engine of the first invention isWithinA tank that is provided separately from the fuel engine body and stores the lubricating oil recovered from the internal combustion engine; a first supply path that supplies the lubricating oil from the tank to a sliding portion of the piston / crank system of the internal combustion engine; A second supply path for supplying lubricating oil to the sliding part of the valve train of the engine, and a piston / crank sliding part through the first supply path, which is disposed on the first supply path and utilizes exhaust heat of the internal combustion engine. And heating means for heating the lubricating oil supplied to the second supply passage, and cooling means for cooling the lubricating oil supplied to the valve train sliding portion by the second supply passage.Wherein the first supply path and the second supply path partially have a common part, the heating means is arranged in the common part, and the cooling means is arranged in a non-common part downstream of the common part.It is characterized by having.
[0008]
According to the lubricating device for an internal combustion engine of the first invention, the lubricating oil supplied to the sliding portion of the piston / crank system via the first supply path is heated by the heating means to reduce the viscosity, and the second supply path is provided. The lubricating oil supplied to the valve train sliding section via the cooling means is cooled by the cooling means to increase the viscosity. Thereby, lubricating oil having a lower viscosity than lubricating oil supplied to the valve operating system sliding portion can be supplied to the piston / crank sliding portion. As a result, lubricating oils having different viscosities can be supplied to the piston / crank sliding part and the valve sliding part, respectively. A lubricating oil having an optimum viscosity can be supplied. By supplying a lubricating oil having an optimum viscosity to each sliding portion, a more advanced operation of the internal combustion engine can be realized.
[0009]
In addition, since the lubricating oil is stored in a separate tank, it is not necessary to provide an oil pan or the like at the bottom of the internal combustion engine, and the overall height of the internal combustion engine can be reduced to lower the center of gravity. Since the center of gravity of the internal combustion engine can be reduced, the kinetic performance of a vehicle or the like on which the internal combustion engine having the lubricating device is mounted can be improved.
[0010]
Furthermore, since the first supply path and the second supply path partially have a common part, the heating means is arranged in the common part, and the cooling means is arranged in the non-common part downstream of the common part. , The second supply channel The temperature of the lubricating oil supplied to the sliding portion of the valve train via the valve can be set more appropriately by using both the heating means and the cooling means. That is, a wide temperature setting range of the lubricating oil can be ensured, and further improvement in engine startability and earlier warm-up can be realized.
[0011]
Here, the cooling unit is a water-cooling type cooling unit using cooling water of the internal combustion engine, and cools the lubricating oil by the cooling unit to raise the temperature of the cooling water, and utilizes the heat of the heated cooling water. Preferably, heating is performed. In this way, the heat of the lubricating oil can be used to heat the interior of a passenger compartment of a vehicle or the like having the lubricating device, which is preferable in terms of energy efficiency.
[0012]
A lubricating device for an internal combustion engine according to a second aspect of the present invention is provided separately from the main body of the internal combustion engine and stores a lubricating oil recovered from the internal combustion engine. The lubricating oil is supplied from the tank to a piston / crank system sliding portion of the internal combustion engine. A first supply path, a second supply path for supplying lubricating oil from a tank to a sliding portion of a valve train of the internal combustion engine, a first supply path disposed on the first supply path, and utilizing exhaust heat of the internal combustion engine. Heating means for heating the lubricating oil supplied to the piston-crank sliding section by the cooling means disposed on the second supply path and cooling the lubricating oil supplied to the valve-operating sliding section by the second supply path , And the first supply path and the second supply path on the downstream side of the heating means are communicated with each other.SupplySecond from the roadSupplyIntroduce lubricating oil into roadBranchIt is characterized by having roads.
[0013]
Also according to the lubricating device for an internal combustion engine of the second invention, the lubricating oil supplied to the piston-crank sliding section via the first supply path is heated by the heating means to reduce the viscosity, and is supplied via the second supply path. The lubricating oil supplied to the sliding portion of the valve train is cooled by the cooling means to increase the viscosity. As a result, lubricating oil having a lower viscosity than lubricating oil supplied to the valve system sliding portion can be supplied to the piston-crank sliding portion. As a result, lubricating oils having different viscosities can be supplied to the piston / crank sliding part and the valve sliding part, respectively. A lubricating oil having an optimum viscosity can be supplied. By supplying a lubricating oil having an optimum viscosity to each sliding portion, a more advanced operation of the internal combustion engine can be realized.
[0014]
Further, the first supply path on the downstream side of the heating means and the second supply path on the downstream side of the cooling means are communicated.BranchDuring cold starts, where the viscosity of the lubricating oil is high, the lubricating oil whose viscosity has been reduced by the heating means is supplied to both the piston-crank system and the valve train, further improving engine startability and improving warm-up. It is possible to realize earlier.
[0015]
Still further, in these inventions,The tank has a heat retaining means for suppressing a decrease in the temperature of the lubricating oil stored inside.Is preferred. If you do this,Since the temperature of the lubricating oil is unlikely to decrease, it is possible to improve engine startability and fuel efficiency by reducing friction. Further, if the temperature of the lubricating oil does not easily fall, vibration and noise can be reduced by promoting combustion of the internal combustion engine, and exhaust emission can be reduced by early warm-up.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
First, a lubricating device for an internal combustion engine according to the present inventionA configuration form which is the basis of the above will be described with reference to FIG..
[0017]
The engine 1, which is an internal combustion engine, has a piston (not shown) that reciprocates in a cylinder, a connecting rod and a crankshaft (not shown) that convert the reciprocating motion of the piston into a rotational motion, and the like. These pistons, crankshafts and the like constitute a piston / crank system 1a. An intake valve (not shown) that opens and closes an intake port and an exhaust valve (not shown) that opens and closes an exhaust port are arranged at the upper part of the cylinder. The intake and exhaust valves are controlled by a camshaft (not shown). It is opened and closed. A valve train 1b is constructed by these intake / exhaust valves, camshafts and the like.
[0018]
An oil receiver 1c is attached to the lowermost part of the engine 1 further below the piston / crank system 1a. The oil receiver 1c is smaller than a normal oil pan. A normal oil pan has a certain depth for storing lubricating oil, but this oil receiver 1c only collects lubricating oil dripped from above, and the depth is minimized. ing. The exhaust port described above communicates with the exhaust pipe 1d, and the exhaust gas passes through the exhaust pipe, is purified by the exhaust purification catalyst, and is released to the atmosphere.
[0019]
The tank 2 for storing the lubricating oil supplied to the piston / crank system 1a and the valve train 1b of the engine 1 described above is arranged separately from the engine 1 body.Book formIn the state, the tank 2 is disposed above the engine compartment, so that maintenance from above is easy. The container of the tank 2 has a double wall structure, and a vacuum layer 2a is formed inside the double wall. Since the vacuum layer 2 a is formed, the temperature of the lubricating oil stored inside the tank 2 is less likely to be released from the outer wall of the tank 2 to the outside.
[0020]
A heat storage body 2b is attached to the bottom of the tank 2 so as to be immersed in the stored lubricating oil. The heat storage body 2b is made of lithium Li, beryllium Be, or a compound thereof. These substances have an excellent heat storage effect, and the temperature of the lubricating oil stored in the tank 2 is stored by the attachment of the heat storage body 2b, and acts to maintain the temperature of the lubricating oil. Each of the vacuum layer 2a and the heat storage body 2b functions as a heat retaining means for suppressing a decrease in the temperature of the lubricating oil in the tank 2.
[0021]
A recovery path 3 for recovering lubricating oil from the engine 1 to the tank 2 is provided from the oil receiver 1c at the bottom of the engine 1 to the tank 2. A pump 4 for pumping the lubricating oil to the tank 2 side and a filter 5 for removing impurities in the lubricating oil are provided on the oil receiver 1c side of the recovery path 3. On the other hand, from the tank 2 to the engine 1 (the piston / crank system 1a and the valve train 1b), a first supply path 6 for supplying lubricating oil from the tank 2 to the piston / crank system 1a of the engine 1; And a second supply path 7 for supplying lubricating oil to the valve train 1 b of the engine 1.
[0022]
Book formIn the state, the first supply path 6 and the second supply path 7 share a part of the pipe near the tank 2. A pump 8 for pumping lubricating oil to the engine 1 is provided on the tank 2 side of the shared pipe of the first supply path 6 and the second supply path 7.Book formIn this state, the above-described pump 4, pump 8, camshaft, and the like are driven using the rotational force of the crankshaft of the engine 1.
[0023]
The first supply path 6 is wound around the above-described exhaust pipe 1 d on the engine 1 side of a branch point with the second supply path 7 to form a heating unit 9. On the other hand, a cooling unit 10 that cools the lubricating oil supplied by the second supply path 7 is disposed on the engine 1 side of the second supply path 7 from a branch point with the first supply path 6. The second supply path 7 and the cooling water channel 11 penetrate inside the cooling unit 10, and the cooling unit 10 gives the heat of the lubricating oil flowing in the second supply path 7 to the cooling water in the cooling water channel 11. It becomes a heat exchanger.
[0024]
The heating unit 9 functions as a heating unit that heats the lubricating oil supplied by the first supply path 6 using the exhaust heat of the engine 1. The cooling unit 10 functions as a cooling unit that cools the lubricating oil supplied by the second supply path 7. The cooling water flow path 11 is branched from between a radiator (not shown) and the engine 1, passes through the cooling unit 10, passes through the heater unit 12, and is again connected to the radiator.
[0025]
Next, a process of collecting lubricating oil from the engine 1 to the tank 2 and supplying the lubricating oil from the tank 2 to the engine 1 by the above-described lubricating device will be described.
[0026]
The lubricating oil that has lubricated the sliding parts of the piston / crank system 1a and the sliding parts of the valve train 1b is dropped and collected in an oil receiver 1c at the bottom of the engine 1. The lubricating oil collected by the oil receiver 1c is sent to the tank 2 by the pump 4. At this time, the lubricating oil sent to the tank 2 is filtered by the filter 5 to remove impurities in the lubricating oil. The lubricating oil collected in the oil receiver 1c has a certain temperature after lubrication of each sliding portion inside the engine 1. The lubricating oil collected in the tank 2 is kept warm by the above-mentioned warming means.
[0027]
The lubricating oil stored in the tank 2 is pumped to the first supply path 6 and the second supply path 7 by the pump 8. The lubricating oil supplied to the sliding portion of the piston / crank system 1a via the first supply path 6 is heated by the exhaust heat in the heating section 9 to lower the viscosity. Thereby, the lubricating oil is made to have an optimum viscosity for the sliding portion of the piston / crank system 1a. This is because in the sliding portion of the piston / crank system 1a, it is preferable that the viscosity of the lubricating oil is lower to some extent so that the lubricating oil does not act as friction and lower the output of the engine 1.
[0028]
On the other hand, the lubricating oil supplied to the sliding portion of the valve train 1b via the second supply passage 7 is cooled by the cooling water in the cooling portion 10 to increase the viscosity. As a result, the lubricating oil has an optimum viscosity for the sliding portion of the valve train 1b. This is because in the sliding portion of the valve train 1b, it is preferable that the viscosity of the lubricating oil is somewhat high so that the lubricating oil forms an oil film and prevents abrasion.
[0029]
At this time, in the cooling unit 10, the cooling water is heated instead of cooling the lubricating oil. The heated cooling water is sent to the heater unit 12. In the heater section 12, the cooling water heated by the heat taken from the lubricating oil is air-cooled, and the heat of the cooling water is given to the air. The heated air heats the passenger compartment of the vehicle on which the engine 1 is mounted. In this way, heating can be performed using heat of the lubricating oil, which is preferable in terms of energy efficiency.
[0030]
As described above, by supplying lubricating oils having different viscosities to the sliding portion of the piston-crank system 1a and the sliding portion of the valve train 1b, the sliding portion of the piston-crank system 1a and the valve train are supplied. Lubricating oil having an optimum viscosity can be supplied to the sliding portion of the system 1b. As a result, lubricating oil having an optimum viscosity can be supplied to each sliding portion, so that the engine 1 can be operated in a more advanced operating state.
[0031]
Further, since the tank 2 for storing the lubricating oil is provided separately from the main body of the engine 1, there is no need to provide an oil pan or the like at the bottom of the engine 1, and the overall height of the engine 1 is reduced to reduce the center of gravity. . Since the center of gravity of the engine 1 can be lowered, the kinetic performance of a vehicle or the like on which the engine 1 having the above-described lubricating device is mounted can be improved.
[0032]
Further, as described above, the lubricating oil in the tank 2 is kept warm by the vacuum layer 2a and the heat storage body 2b. For this reason, even after the engine 1 is stopped, a decrease in the temperature of the lubricating oil is suppressed, and the lubricating oil attempts to maintain the temperature. As a result, it is possible to improve the startability of the engine 1 and achieve early warm-up.
[0033]
For example, if lubricating oil at 120 ° C. is left in an atmosphere of −5 ° C. in a tank without a heat retaining means, the temperature of the lubricating oil drops to about 10 ° C. in 1 hour to 1.5 hours. In contrast, lubricating oil at 120 ° CBook formWhen left in an atmosphere of -5 ° C. by the tank 2 having the heat retaining means, the temperature of the lubricating oil was about 40 ° C. even after 8 to 9 hours. That is, in cold regions, etc., when the engine 1 is turned on when going to work in the morning and the engine 1 is turned on again when returning home in the evening, or when the engine 1 is turned on when returning home in the evening and turned on the engine 1 the next morning, startability is low. It is greatly improved and the warm-up time can be greatly reduced.
[0034]
If the startability of the engine is improved, exhaust emissions at the time of starting the engine 1 can be reduced. Further, if the early warm-up is realized, the friction is reduced because the oil viscosity is reduced to some extent immediately after the start, and the acceleration / output performance is improved. Further, if the friction is reduced, the fuel consumption is reduced, and the fuel efficiency is improved. Further, the early warm-up speeds up the water temperature, improves the heater performance, and terminates the warm-up early, so that the combustion of the engine 1 is promoted and the vibration and noise are reduced. In addition, early warming-up eliminates the driver's squatting and the like, so that oil consumption and blow-by gas can be suppressed.
[0035]
Next, the present invention(First invention)Of the internal combustion engine lubrication systemoneAn embodiment will be described. FIG. 2 shows the configuration of the internal combustion engine and the lubricating device according to the present embodiment.
[0036]
The lubricating device of this embodiment is described above.ShapeThe lubricating device of the present embodiment is different from the lubricating device only in the way of piping of the first supply path and the second supply path. For this reason,ShapeConfiguration that is different from theShapeComponents that are the same as or equivalent to those in the embodiment are given the same reference numerals, and detailed descriptions thereof are omitted.
[0037]
The first supply path 60 and the second supply path 70 in the present embodiment share a part of the piping on the tank 2 side, similarly to the lubricating device of the first embodiment described above. However, in the present embodiment, the heating unit 9 is disposed on a shared pipe of the first supply path 60 and the second supply path 70. The pipe is branched on the engine 1 side of the heating unit 9, and the cooling unit 10 is disposed on the branched second supply path 70.
[0038]
In this way, the lubricating oil supplied to the valve train 1b is once heated by the heating unit 9 to lower the viscosity, and then cooled by the cooling unit 10 to increase the viscosity. If the amount of heat taken by the cooling unit 10 is larger than the heat given by the heating unit 9, the viscosity of the lubricating oil supplied to the valve train 1b is made higher than the viscosity of the lubricating oil when supplied directly from the tank 2. be able to. On the contrary, if the heat given by the heating unit 9 is made larger than the amount of heat taken by the cooling unit 10, the viscosity of the lubricating oil supplied to the valve train , But higher than the viscosity of the lubricating oil supplied to the piston-crank system 1a. These may be appropriately set according to the mechanism of the engine 1 and the characteristics of the lubricating oil used.
[0039]
As described above, in the present embodiment, both the heating unit 9 and the cooling unit 10 are arranged on the second supply path 70 in series. In such a case, if the cooling unit 10 is disposed closer to the engine 1 on the second supply path 70, the lubricating oil cooled and increased in viscosity can be supplied to the valve train 1b of the engine 1. no problem. Similarly, a case where both the heating unit and the cooling unit are arranged in series on the first supply path is also conceivable. In this case, if the heating unit is disposed closer to the engine 1 on the first supply path, there is no problem because the lubricating oil heated and reduced in viscosity can be supplied to the piston-crank system of the engine.
[0040]
According to the present embodiment, lubricating oils having different viscosities can be supplied to the piston / crank system 1a and the valve train 1b.Shown in FIG. 1 aboveThe same effect as the above-mentioned effect by the lubricating device of the embodiment can be obtained. In addition, since the tank 2 having the heat retaining means is provided separately from the engine 1,Shown in FIG. 1 aboveThe same effect as the above-mentioned effect by the lubricating device of the embodiment can be obtained.
[0041]
Next, the present invention(Second invention)Of the internal combustion engine lubrication systemtwoAn embodiment will be described. FIG. 3 shows the configuration of the internal combustion engine and the lubrication device according to the present embodiment.
[0042]
The lubricating device of this embodiment is also described above.Shown in Figure 1Since it has a configuration according to the lubrication device of the form,Shown in Figure 1The configuration different from the embodiment will be described in detail, and the same reference numerals will be given to the same or equivalent configurations as in the above-described first embodiment, and detailed description thereof will be omitted.
[0043]
In the lubricating device of the present embodiment, a branch valve 13 is provided on the first supply path 6 located closer to the engine 1 than the heating unit 9. One pipe branched by the branch valve 13 is directly connected to the piston / crank system 1a as the first supply path 6, and the other pipe is branched.Road 14 is connected to the second supply path 7. The branch valve 13 supplies the lubricating oil supplied from the tank 2 side of the first supply path 6 only to the piston-crank system 1a and does not supply the lubricating oil to the branch path 14; 14 (that is, the valve supply system 1b).
[0044]
In the present embodiment, the cooling unit 100 that cools the lubricating oil supplied by the second supply path 7 is an air-cooled type. As the air used for cooling, the traveling wind may be used as it is, or air that has passed through a radiator may be used. The junction of the branch path 14 and the second supply path 7 is located closer to the engine 1 than the cooling unit 100 is. Shut-off valves 15 and 16 are arranged before and after the cooling unit 100 on the second supply path 7. The shutoff valves 15 and 16 shut off the flow of the lubricating oil in the second supply path 7.
[0045]
The branch valve 13 and the shutoff valves 15 and 16 are connected to an electronic control unit (ECU) 17 that controls the engine 1 comprehensively, and are controlled based on a signal from the ECU 17. The ECU 17 is also connected to a water temperature sensor 18 attached to the engine block of the engine 1 to detect the temperature of the cooling water and an exhaust temperature sensor 19 attached to the exhaust pipe 1d to detect the exhaust gas temperature.
[0046]
In the lubricating device of the present embodiment, the supply path of the lubricating oil is switched between when the engine 1 is cold started and during normal operation. The switching of the lubricating oil supply path will be described below.
[0047]
During a cold start, the temperature of the lubricating oil stored in the engine 1 is lower and the viscosity of the lubricating oil is higher than in normal operation (the lubricating oil in the tank 2 is kept warm by the warming means of the tank 2). Even in the state where it is running, it is often lower than that during normal operation). Therefore, during a cold start, the viscosity of the lubricating oil stored in the tank 2 may be higher than the optimum viscosity for the valve train 1b. In such a case, even if the lubricating oil is supplied to the valve train 1b, it is not necessary to actively increase the viscosity in the cooling unit 100.
[0048]
At the time of a cold start in such a case, lubricating oil whose viscosity has been reduced by the heating unit 9 is supplied to both the piston-crank system 1a and the valve train 1b. Then, the mode is shifted to the normal operation state, and after the temperature of the lubricating oil in the tank 2 rises (that is, the viscosity decreases), the lubricating oil whose viscosity has been reduced by the heating unit 9 is supplied to the piston / crank system 1a. Then, lubricating oil whose viscosity is increased by the cooling unit 100 is supplied to the valve train 1b. Hereinafter, a specific description will be given.
[0049]
The ECU 17 determines whether or not the engine 1 has been cold started based on the outputs of the water temperature sensor 18, the exhaust temperature sensor 19, and the like. If it is determined that the engine is a cold start, the ECU 17 supplies the branch valve 13 with the lubricating oil supplied from the tank 2 side of the first supply path 6 to the piston / crank system 1a and the branch path 14 (that is, A switching signal is transmitted so as to supply both of the valve systems 1b). At the same time, a closing signal is transmitted from the ECU 17 to the shutoff valves 15 and 16 so as to shut off the flow paths before and after the cooling unit 100 of the second supply path 7.
[0050]
As a result, the lubricating oil whose viscosity has been reduced by the heating unit 9 is supplied to both the piston / crank system 1a and the valve train 1b. Since the lubricating oil cooled in the cooling unit 100 stays in the cooling unit 100, it is not mixed with the lubricating oil supplied by the first supply path 6. If the operation of the engine 1 is continued in this state, the temperature of the entire circulating lubricating oil rises due to the heat generated by the engine 1, and the operation shifts to the normal operation.
[0051]
The ECU 17 determines whether or not the engine 1 is in normal operation based on outputs from the water temperature sensor 18 and the exhaust temperature sensor 19. When it is determined that the operation is normal, the ECU 17 supplies the branch valve 13 with the lubricating oil supplied from the tank 2 side of the first supply path 6 only to the piston / crank system 1 a and supplies the lubricating oil to the branch path 14. A switching signal is transmitted so as not to supply. At the same time, an opening signal is transmitted from the ECU 17 to the shutoff valves 15 and 16 so as to open the flow paths before and after the cooling unit 100 of the second supply path 7. After that, since the lubricating oil supply mode is the same as that of the lubricating device of the above-described first embodiment, detailed description will be omitted.
[0052]
According to the present embodiment, lubricating oils having different viscosities can be supplied to the piston / crank system 1a and the valve train 1b.Shown in Figure 1The same effect as the above-mentioned effect by the lubricating device of the embodiment can be obtained. Furthermore, in the present embodiment, at the time of a cold start in which the viscosity of the lubricating oil is high, the lubricating oil whose viscosity has been reduced by the heating unit 9 is supplied to both the piston-crank system 1a and the valve train 1b, so that the engine start-up performance is reduced. , And earlier warm-up can be realized. In addition, since the tank 2 having the heat retaining means is provided separately from the engine 1,Shown in Figure 1The same effect as the above-mentioned effect by the lubricating device of the embodiment can be obtained.
[0053]
The internal combustion engine is mounted on a vehicle or the like to drive the vehicle. At this time, the internal combustion engine is extremely heavy among the on-vehicle components, and there is a demand that the center of gravity of the internal combustion engine be reduced as much as possible in order to improve the kinetic performance of the vehicle. Further, there is a demand for ending the warm-up earlier in a cold region or the like in order to operate the internal combustion engine more stably earlier.
[0054]
A reference example for achieving such a request will be described below. The lubricating device according to this reference example includes a tank that is provided separately from the main body of the internal combustion engine and stores the lubricating oil recovered from the internal combustion engine, and the tank is configured to keep the temperature of the lubricating oil stored inside low. Means.
[0055]
According to the lubricating device for an internal combustion engine of this reference example, since the temperature of the lubricating oil is unlikely to decrease, it is possible to achieve an improvement in engine startability and an improvement in fuel efficiency by reducing friction. Further, if the temperature of the lubricating oil does not easily fall, vibration and noise can be reduced by promoting combustion of the internal combustion engine, and exhaust emission can be reduced by early warm-up.
[0056]
The configuration of the lubricating device of this reference example will be described with reference to FIG.
[0057]
Book formState lubrication device is as described aboveShown in Figure 1It is not intended to supply lubricating oil having different viscosities to the sliding portion of the piston / crank system 1a and the sliding portion of the valve train 1b of the engine unlike the lubricating device of the embodiment.Book formThe lubricating device in the state is intended only for keeping the lubricating oil warm. But,Book formState lubrication device is also described aboveShown in Figure 1Since it has a configuration according to the lubrication device of the form,Shown in Figure 1About the same or equivalent composition as a form, the same numerals are attached and the detailed explanation is omitted.
[0058]
Book formState lubrication device is a so-called dry sump type,Shown in Figure 1It has a separate tank 2 similar to the tank 2 of the embodiment. On the supply path 600 from the tank 2 to the engine 1, a shutoff valve 21, an oil cooler 22, a pump 80 and a filter 50 are sequentially arranged from the tank 2 side. A shut-off valve 20 is also provided near the tank 2 on the recovery path 3 for recovering the lubricating oil from the engine 1. The shutoff valves 20 and 21 are connected to the ECU 17 and are controlled by an open / close signal from the ECU 17.
[0059]
The oil cooler 22 is provided for the purpose of maintaining a proper lubricating oil temperature, and is an air-cooled type here. If the temperature of the lubricating oil is too high, the characteristics of the lubricating oil will be impaired, so such an oil cooler 22 is provided. The oil cooler 22 may be a water-cooled type using the cooling water of the engine 1. The pump 80 is for pumping lubricating oil in the tank 2 to the engine 1. The filter 50 is for removing impurities in the lubricating oil supplied to the engine 1. A pump 4 is provided on the engine 1 side of the recovery path 3. The pump 4 is for sucking lubricating oil at the bottom of the engine 1 by the strainer 4a and for pumping the lubricating oil to the tank 2.
[0060]
Book formThe tank 2 in the state also has a vacuum layer 2a and a heat storage body 2b as heat retaining means. As a result, even after the engine 1 is stopped, a decrease in the temperature of the lubricating oil in the tank 2 can be suppressed, and startability can be improved and early warm-up can be realized. Also,Book formShut-off valves 20 and 21 are provided before and after the tank 2 in the state. When the ECU 17 determines that the engine 1 is stopped, the shut-off valves 20 and 21 are closed by the ECU 17. As a result, the lubricating oil circulates in the flow path by natural convection or the like, so that the lubricating oil in the tank 2 is reliably stored in the tank 2 and the temperature of the lubricating oil is prevented from lowering.
[0061]
The effect obtained by the separate tank 2 having the heat retaining means is as follows.Shown in Figure 1The same effect as described above by the lubrication device of the form,Book formIn the embodiment, since the temperature decrease of the lubricating oil can be more effectively suppressed, the above-described effects can be realized more effectively.
[0062]
The lubricating device for an internal combustion engine according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the first supply path 6(60)And second supply path 7(70)Means that some of the pipes are shared, but need not be shared. In this case, from the tank 2 to the engine 1, the first supply path and the second supply path are arranged in parallel. In addition, thetwoIn the embodiment, the ECU 17 determines whether or not to switch the lubricating oil supply path using the various sensors 18 and 19 to determine whether or not the engine is cold starting. However, the lubricating oil in the tank 2 is simply at or above a predetermined temperature. The lubricating oil supply path may be switched depending on whether or not, or whether the temperature of the lubricating oil supplied to the valve train 1b is equal to or higher than a predetermined temperature.
[0063]
【The invention's effect】
First and secondA lubricating device for an internal combustion engine according to the present invention includes a separate tank, heating means for heating lubricating oil supplied to a piston-crank sliding portion by a first supply path using exhaust heat, and a second supply path. And cooling means for cooling the lubricating oil supplied to the valve operating system sliding part, so that the piston / crank system sliding part and the valve operating system sliding part have different lubricating oils respectively. , And lubricating oil having an optimum viscosity can be supplied to each of the piston-crank sliding portion and the valve train sliding portion. Since lubricating oil having an optimum viscosity can be supplied to each sliding portion, a more advanced operation of the internal combustion engine can be realized.
[0064]
Furthermore, in the first invention, the first supply path and the second supply path partially have a common part, the heating means is disposed in the common part, and the cooling means is a non-shared part downstream of the common part. Are located in For this reason, the lubricating oil temperature supplied to the sliding portion of the valve train via the second supply path can be set more appropriately by using both the heating means and the cooling means. That is, a wide temperature setting range of the lubricating oil can be ensured, and further improvement in engine startability and earlier warm-up can be realized.
[0065]
On the other hand, in the second invention, the first supply path downstream of the heating means and the second supply path downstream of the cooling means are communicated with each other,SupplySecond from the roadSupplyIntroduce lubricating oil into roadBranchThere are more roads. For this reason,BranchDuring cold start, when the viscosity of the lubricating oil is high, the lubricating oil whose viscosity has been reduced by the heating means can be supplied to both the piston-crank system and the valve train, further improving engine startability and improving warm-up. It is possible to realize earlier.
[Brief description of the drawings]
FIG. 1 shows a lubricating device for an internal combustion engine according to the present invention.Basic configurationFIG. 1 is a configuration diagram illustrating a configuration of an embodiment.
FIG. 2 shows a lubricating device for an internal combustion engine according to the present invention.oneFIG. 1 is a configuration diagram showing a configuration of an embodiment.
FIG. 3 is a diagram showing a lubricating device for an internal combustion engine according to the present invention;twoFIG. 1 is a configuration diagram showing a configuration of an embodiment.
FIG. 4 shows a lubricating device for an internal combustion engine according to the present invention.Configuration of Reference ExampleFIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Tank, 2a ... Vacuum layer (heat insulation means), 2b ... Heat storage body (heat insulation means), 6, 60 ... 1st supply path, 7, 70 ... 2nd supply path, 9 ... Heating part (heating) Means), 10, 100 cooling unit (cooling means), 12 heater unit, 13 branch valve, 14 branchRoad.

Claims (4)

In a lubrication device for an internal combustion engine that supplies lubricating oil to the internal combustion engine,
A tank that is provided separately from the internal combustion engine body and stores lubricating oil recovered from the internal combustion engine,
A first supply path for supplying lubricating oil from the tank to a piston / crank sliding part of the internal combustion engine,
A second supply path for supplying lubricating oil from the tank to the valve train sliding portion of the internal combustion engine,
Heating means arranged on the first supply path, utilizing the exhaust heat of the internal combustion engine, heating the lubricating oil supplied to the piston-crank sliding unit by the first supply path,
Cooling means disposed on the second supply path, for cooling the lubricating oil supplied to the valve system sliding portion by the second supply path ,
The first supply path and the second supply path partially have a common part, the heating means is arranged in the common part, and the cooling means is arranged in a non-common part downstream of the common part. lubrication system for an internal combustion engine, characterized in that it is. In a lubrication device for an internal combustion engine that supplies lubricating oil to the internal combustion engine,
A tank that is provided separately from the internal combustion engine body and stores lubricating oil recovered from the internal combustion engine.
A first supply path for supplying lubricating oil from the tank to a piston / crank sliding part of the internal combustion engine,
A second supply path for supplying lubricating oil from the tank to the valve train sliding portion of the internal combustion engine,
A heating unit disposed on the first supply path and using the exhaust heat of the internal combustion engine to heat lubricating oil supplied to the piston / crank sliding unit by the first supply path;
Cooling means arranged on the second supply path, for cooling lubricating oil supplied to the valve train sliding section by the second supply path, and
A branch path for communicating the first supply path on the downstream side of the heating means and the second supply path on the downstream side of the cooling means and introducing lubricating oil from the first supply path to the second supply path was provided. A lubricating device for an internal combustion engine, comprising: The cooling means is a water-cooling type cooling means using cooling water of the internal combustion engine, cooling the lubricating oil by the cooling means to raise the temperature of the cooling water, and utilizing the heat of the heated cooling water. The lubricating device for an internal combustion engine according to claim 1, wherein heating is performed. The lubricating device for an internal combustion engine according to any one of claims 1 to 3, wherein the tank has a heat retaining means for suppressing a decrease in the temperature of the lubricating oil stored therein.

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