JP4267949B2 - Lubricating device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubricating device for an internal combustion engine, and in particular, a heat retaining tank for storing oil in an internal combustion engine in an oil pan, holding the oil in the oil pan, and introducing a part of the oil from a lower suction port to keep warm. The present invention relates to a lubricating device for an internal combustion engine.
[0002]
[Prior art]
In general, in an internal combustion engine lubrication device, oil (lubricating oil) collected in an oil reservoir, usually called an oil pan, is pumped by an oil pump (lubricating pump) to a lubricating portion of the internal combustion engine body and various drive devices. It is comprised so that. However, the oil used for lubrication or cooling of the sliding part or the like changes in viscosity depending on the temperature, and the viscosity increases particularly at a low temperature such as below freezing point. The friction loss of becomes large.
[0003]
In view of such points, for example, in Patent Document 1 below, for the purpose of providing an oil pan that exhibits sufficient heat retaining performance against stored lubricating oil, a baffle plate or a heat retaining material is provided in the oil pan. It has been proposed to provide a cover and accommodate a heat storage body.
[0004]
Further, Patent Document 2 below is provided in an oil pan of an internal combustion engine, has a substantially vertical side surface and an inclined surface close to horizontal, and the oil pan has two main chamber and sub chambers by a substantially vertical side surface. It is divided into two parts and is equipped with a separator that covers the upper part of the sub chamber with an inclined surface close to the horizontal, and the main chamber and the sub chamber are always in communication. A hole having an area large enough to give a large viscous resistance to the oil flowing into the main chamber and substantially prevent the flow, and a portion below the oil level in the upper region of the substantially vertical side surface of the separator A warm-up promoting device for an internal combustion engine has been proposed, which is provided with a communication hole that always communicates the main chamber and the sub chamber.
[0005]
Further, Patent Document 3 below proposes disposing an oil tank in the oil pan. That is, an oil that stores oil for the purpose of supplying hot oil that has been kept warm at the start of the internal combustion engine to each part of the internal combustion engine and suppressing problems caused by overheating of the oil during operation of the internal combustion engine. It has a pan, an oil tank with a heat retaining function, and an oil pump that supplies oil. When the oil pump is in operation, an oil passage is formed so that the oil in the oil pan is always pumped up through the oil tank. Furthermore, a lubricating device has been proposed in which the oil tank is sealed by a check valve when the operation of the internal combustion engine is stopped.
[0006]
[Patent Document 1]
JP 2000-199416 A [Patent Document 2]
Japanese Patent Laid-Open No. 6-17633 [Patent Document 3]
Japanese Patent Laid-Open No. 2002-188422
[Problems to be solved by the invention]
As described above, as a lubrication device for an internal combustion engine, a method in which oil collected in an oil pan is pumped to a necessary part by an oil pump is generally used. When oil temperature is low and viscosity is high, friction loss is caused. Therefore, various measures are taken as described in the above-mentioned Patent Documents 1 to 3. On the other hand, since the amount of heat generated by the internal combustion engine becomes large and the oil becomes hot as in a high-load operation, the lubricity deteriorates. Therefore, it is necessary to cool the oil so as not to exceed the allowable temperature.
[0008]
However, in the lubricating devices described in the above-mentioned Patent Documents 1 to 3, it is intended to ensure heat retention or promote warm-up, and sufficient consideration is not given to oil cooling. For example, in the above-mentioned Patent Document 1, since heat radiation from the oil pan cannot be expected, a separate cooling means is required. Further, the warm-up promoting device described in Patent Document 2 can rapidly increase the temperature of oil in the oil pan during warm-up, but does not have a heat-retaining function, and thus cannot solve the above-mentioned start-up problem. Since the oil circulating through the internal combustion engine is collected in the vicinity of the suction port (strainer) of the oil pump, ensuring the cooling performance is a contradiction.
[0009]
Further, in the lubricating device described in the above-mentioned Patent Document 3, heat retention can be ensured by the heat retention tank, but after the heat retention oil stored in the heat retention tank is consumed, the oil having a low temperature and high viscosity is used. Since it circulates, depending on the operating conditions, this low temperature oil may mix with the previous heat retaining oil and the temperature may drop rapidly. Further, a separate cooling means is required for the oil that has reached a high temperature.
[0010]
In view of this, the present invention includes a heat retaining tank that is held in an oil pan of an internal combustion engine and that keeps the oil in the oil pan introduced through a lower suction port, and lubricates the internal combustion engine that supplies the oil in the heat retaining tank. In the device, the heat insulation tank ensures sufficient heat insulation for the oil, and is configured so as to be able to properly cool the high-temperature oil after warming up, from the start of the internal combustion engine to after warming up. It is an object of the present invention to provide a lubrication device that can supply oil appropriately.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention stores the oil of the internal combustion engine in the oil pan, holds the oil in the oil pan, and lowers a part of the oil in the oil pan. In a lubricating device for an internal combustion engine, which is provided with a heat retaining tank that is introduced from the suction port and retains heat, and the oil in the heat retaining tank is supplied into the internal combustion engine, the upper portion of the heat retaining tank is shielded and the suction of the heat retaining tank A first plate member arranged to be inclined downward as approaching the mouth, and is positioned below the first plate member and has a gap in the horizontal direction with respect to the lowermost end of the first plate member And a second plate member that has a gap with respect to the inner surface of the oil pan and is inclined so as to be inclined downward as it is separated from the suction port of the heat retaining tank, and above the first plate member Adjusts to limit the movement to the heat retaining tank side when the oil temperature is low, and to allow the movement to the heat retaining tank side below the first plate member regardless of the oil temperature. An adjusting means is provided, and the oil of the internal combustion engine is configured to return into the oil pan from above the first plate member via the adjusting means.
[0012]
According to a second aspect of the present invention, the adjusting means is formed above the first plate member, becomes a resistance against oil having a relatively low temperature and a high viscosity, and substantially prevents passage. A plurality of small-diameter holes that allow passage of relatively high-temperature and low-viscosity oil, and a plurality of large-diameter holes that are formed below the first plate member and that allow passage of relatively low-temperature and high-viscosity oil. It is good to have a diameter hole.
[0013]
Further, as described in claim 3, the adjusting means extends from the small diameter hole formed above the first plate member to the large diameter hole formed below the first plate member. A plurality of holes may be formed so that the inner diameter gradually increases.
[0014]
The second plate member may be constituted by a plurality of baffle plates arranged around the heat retaining tank, as described in claim 4. In addition, the said heat retention tank is good to set it as the heat insulation structure which made the vacuum between the double wall which consists of an outer cylinder and an inner cylinder excellent in heat retention.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an oil pan portion of a lubricating device for an internal combustion engine according to an embodiment of the present invention. An oil pan 2 is joined to a cylinder block 1 of the internal combustion engine EG. In addition, since the structure in the internal combustion engine EG is the same as that of the conventional apparatus, description is abbreviate | omitted. In the present embodiment, the heat retaining tank 3 is accommodated in the oil pan 2, and the oil flows between the lower suction port 3 a (in this embodiment, the strainer 4 provided on this) and the bottom surface of the oil pan 2. The resulting gap is supported.
[0016]
The heat retaining tank 3 of the present embodiment is a cylindrical body having a heat insulating structure in which, for example, a double wall composed of an outer tube and an inner tube (not shown) excellent in heat retaining properties is evacuated. As shown by a broken line in FIG. 2, a discharge pipe 3b is provided so that one end opens near the bottom surface in the heat retaining tank 3, and the other end is connected to an oil pump (not shown). The strainer 4 prevents impurities from entering the oil. However, the strainer 4 is not necessarily attached to the suction port 3a, and the strainer 4 includes the strainer 4 in the present invention.
[0017]
On the other hand, a baffle plate 11 that functions as a first plate member of the present invention is sandwiched between the cylinder block 1 and the oil pan 2 above the heat retaining tank 3. As shown in FIG. 1, the baffle plate 11 is disposed so as to shield the upper side of the heat retaining tank 3 and to be inclined downward as it approaches the suction port 3 a (and the strainer 4) of the heat retaining tank 3.
[0018]
And as shown in FIG. 1, it becomes resistance with respect to oil of relatively low temperature and high viscosity over the predetermined range (substantially the whole surface except the lowest end part in this embodiment) above the baffle plate 11. A plurality of small-diameter holes 11a that substantially prevent passage and allow passage of oil having a relatively high temperature and low viscosity are formed. On the other hand, below the baffle plate 11, a plurality of large-diameter holes 11b that allow passage of oil having a relatively low temperature and high viscosity are formed, and these small-diameter holes 11a and large-diameter holes 11b define the present invention. Adjustment means is configured. In addition, you may form so that the internal diameter of a some hole may increase gradually from the small diameter hole 11a formed above the baffle plate 11 to the large diameter hole 11b formed below the baffle plate 11. FIG.
[0019]
Further, as shown in FIGS. 1 and 2, baffle plates 12 and 13 that function as a second plate member of the present invention are supported by the oil pan 2 below the baffle plate 11. As shown in FIG. 2, the baffle plate 12 is disposed so as to be inclined downward as it is separated from the suction port 3 a (and the strainer 4) of the heat retaining tank 3, and is horizontally spaced with respect to the lowermost end of the baffle plate 11. d1 (FIG. 1) and a gap d2 (FIG. 2) with respect to the inner surface of the oil pan 2. Further, as shown in FIG. 1, the baffle plate 13 forms an inclined surface substantially continuous with the baffle plate 12 across the heat retaining tank 3 and has a gap d3 (FIG. 1) with respect to the inner surface of the oil pan 2. . As shown in FIGS. 1 and 2, the oil level is indicated by S, and when a specified amount of oil is injected, the oil level S becomes a position where the heat retaining tank 3 is substantially buried.
[0020]
Next, the operation of the lubricating device of the present embodiment configured as described above will be described. When the internal combustion engine EG is started and an oil pump (not shown) is driven, the oil kept warm in the heat retaining tank 3 is pumped into the internal combustion engine EG, and the oil circulated in the internal combustion engine EG is oil pan 2. Introduced in. As shown in FIG. 1, this oil first reaches the baffle plate 11, but at the time of start-up (and during warm-up), the oil is low temperature (high viscosity), so it cannot pass through the small diameter hole 11 a, and the oil 1 moves downward along the inclined surface of the baffle plate 11 as indicated by the dotted arrows in FIG.
[0021]
Then, when reaching the large diameter hole 11b, the passage of oil having a low viscosity at a low temperature is allowed, so that the oil moves downward through the large diameter hole 11b and passes through the gap d1 (FIG. 1). As indicated by dotted arrows in 1 and 2, the suction port 3a (and the strainer 4) located near the lowermost end of the baffle plate 11 is immediately reached, sucked into the heat retaining tank 3, and pumped back into the internal combustion engine EG. Therefore, the temperature rise of the oil is promoted. Thus, the friction loss of the sliding portion can be kept low immediately after starting.
[0022]
On the other hand, when the operation time of the internal combustion engine EG elapses, the oil is warmed and the viscosity is lowered. When the oil reaches a high temperature of 80 ° C. or higher, most of the oil moves downward through the small-diameter holes 11a of the baffle plate 11 as shown by white arrows in FIG. Reach. Since these baffle plates 12 and 13 are arranged so as to incline downward as they are separated from the suction port 3a (and the strainer 4), the oil is not separated as shown by white arrows in FIGS. It is guided to the bottom surface of the oil pan 2 from d2 (FIG. 2) and the gap d3 (FIG. 1), and moves to the strainer 4 while being cooled along the bottom surface. That is, the oil is cooled and sucked into the heat retaining tank 3 by the movement during this time. As a result, the oil reaches an appropriate temperature and is pumped to the internal combustion engine EG. Note that if a fin (not shown) is formed outside the bottom of the oil pan 2, the cooling effect is increased.
[0023]
As described above, in the present embodiment, the baffle plates 11 to 13 reach the suction port 3a (strainer 4) of the heat retaining tank 3 in accordance with the temperature (viscosity) of the oil introduced into the oil pan 2. The oil path is automatically selected, so that the optimum lubricity and hydraulic controllability can be ensured from low to high temperature, and from the start of the internal combustion engine EG to after warm-up. Oil can be properly supplied. In particular, the heat retaining tank 3 may be of a size that can secure a capacity sufficient to accommodate the minimum amount of oil that needs to be kept warm, so that a heat insulating structure such as a double wall structure necessary for keeping heat can be minimized. it can.
[0024]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects. That is, in the lubricating device for an internal combustion engine according to claim 1, the first plate member that shields the upper side of the heat retaining tank and is inclined so as to approach the suction port of the heat retaining tank, and the first plate member, Located below the first plate member, has a gap in the horizontal direction with respect to the lowermost end of the first plate member, and has a gap with respect to the inner surface of the oil pan, and as the distance from the suction port of the heat retaining tank increases. A second plate member disposed so as to incline downward, and when the oil temperature is low above the first plate member, the movement to the heat retaining tank side is restricted, and below the first plate member, An adjusting means is provided for adjusting so as to allow the movement toward the heat retaining tank regardless of the temperature of the oil, and the oil of the internal combustion engine is supplied from above the first plate member through the adjusting means. When the internal combustion engine is started, the oil path from the oil pan to the intake port of the heat retaining tank is automatically selected according to the oil temperature. The oil can be supplied properly from warm to warm up. In addition, since the heat insulation tank can minimize the heat insulation structure necessary for heat insulation, it is possible to ensure good durability and reliability.
[0025]
If the adjusting means is configured as described in claim 2 or 3, and the second plate member is configured as described in claim 4, it can be configured simply and inexpensively.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration in an oil pan in an internal combustion engine lubricating device according to an embodiment of the present invention.
2 is a cross-sectional view showing a configuration inside an oil pan in a lubricating device for an internal combustion engine according to an embodiment of the present invention, and is a cross-sectional view taken along line AA of FIG.
[Explanation of symbols]
EG internal combustion engine, 1 cylinder block, 2 oil pan,
3 heat retention tank, 3a suction port, 3b discharge pipe, 4 strainer,
11, 12, 13 baffle plate, 11a small diameter hole, 11b large diameter hole,
d1, d2, d3 gap

Claims (4)

An internal combustion engine oil is stored in an oil pan, and a heat retaining tank is provided that retains the oil in the oil pan and heats a portion of the oil in the oil pan through a lower suction port. In the internal combustion engine lubrication apparatus that is supplied into the internal combustion engine, a first plate member that shields the upper side of the heat retaining tank and is inclined so as to be inclined downward as it approaches the suction port of the heat retaining tank; Located below the first plate member, has a gap in the horizontal direction with respect to the lowermost end of the first plate member, has a gap with respect to the inner surface of the oil pan, and is separated from the inlet of the heat retaining tank. And a second plate member disposed so as to be inclined downward, and when the oil temperature is low above the first plate member, the second plate member moves toward the heat retaining tank. And adjusting means for adjusting to allow movement to the heat retaining tank side regardless of the temperature of the oil below the first plate member, and for supplying the oil of the internal combustion engine to the first plate member A lubricating device for an internal combustion engine, which is configured to return to the oil pan from above via the adjusting means. The adjusting means is formed above the first plate member, becomes a resistance to oil having a relatively low temperature and high viscosity, substantially prevents passage, and has a low viscosity at a relatively high temperature. A plurality of small-diameter holes that allow passage of oil and a plurality of large-diameter holes that are formed below the first plate member and allow passage of oil of relatively low temperature and high viscosity, The internal combustion engine lubrication device according to claim 1. The adjusting means forms a plurality of holes so that the inner diameter gradually increases from the small diameter hole formed above the first plate member to the large diameter hole formed below the first plate member. 3. A lubricating device for an internal combustion engine according to claim 2, wherein 4. The internal combustion engine lubrication device according to claim 1, wherein the second plate member includes a plurality of baffle plates disposed around the heat retaining tank. 5.

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