JP2019173644A - Lubrication device of internal combustion engine for automobile - Google Patents

Abstract

In a configuration in which a strainer is opened toward a recess of an oil pan, an empty suction phenomenon at the time of starting caused by moisture in oil being frozen when an engine is stopped and an opening surface of the recess is closed, Prevent with a simple structure. A suction port (15) of a strainer (11) is partially located on an opening surface (8b) of a recess (8). Even if the ice film 24 is formed on the opening surface 8b of the recess 8, the oil is sucked up from the oil O from above the ice film 24 at the time of starting, so that the oil pump does not idle. Since the structure is simple, there is no problem of cost increase and weight increase (fuel consumption deterioration). [Selection diagram] FIG.

Description

  The present invention relates to a lubricating device for an internal combustion engine for automobiles.

  In an internal combustion engine, when the operation is stopped, the oil returns to the oil pan and accumulates. However, if the outside air temperature is less than or equal to zero degrees, the water contained in the oil freezes and may cause trouble at the start.

  Therefore, in Patent Document 1, if the exhaust gas passage is provided with a bypass passage that enters the inside of the oil pan, and it is determined that ice blocks are generated in the oil pan, the exhaust gas is caused to flow through the bypass passage and ice blocks. Is disclosed.

  Further, in Patent Document 2, a strainer for sucking oil is formed in a bifurcated portion having a first pipe and a second pipe, and a valve is provided on the first pipe so that the suction negative pressure is closed at a predetermined value or less. Thus, there is disclosed a configuration in which when an ice block is generated, it is sucked into the second pipe. That is, in Patent Document 2, the second pipe is provided with a filter that prevents the passage of ice blocks, and when the taken ice blocks accumulate in the second pipe, the flow resistance of the second pipe increases, so that As the negative pressure of the pipe increases, the valve opens, and as a result, oil that does not contain ice blocks flows into the first pipe.

Japanese Patent Laid-Open No. 2006-169625 JP-A-2006-156359

  In Patent Document 2, a recess recessed downward is formed in the oil pan, and the suction port of the strainer enters the interior of the recess. In this way, if the strainer suction port is inserted into the recess, the recess is filled with oil even if the car turns and the oil moves through the oil pan. It is in. Therefore, it is possible to prevent a phenomenon that the suction port of the strainer becomes above the oil level and the oil pump sucks air.

  However, when the inventors of the present invention have studied, when a recess for suction is formed in the oil pan, an ice film is generated so as to spread over the opening surface of the recess. The place was covered with an ice film, and even when the oil pump was driven, it was in an “empty sucking” state where the oil pump was idle.

  In this regard, Patent Documents 1 and 2 can be used as countermeasures against ice blocks floating inside the oil, but it can be said that they are not countermeasures against ice generated in a film shape on the opening surface of the recess. In addition, Patent Documents 1 and 2 not only have a very complicated structure and high cost, but also require a special member and increase the weight, resulting in a decrease in fuel consumption. It is understood that it is inferior.

  Further, the adverse effects caused by freezing of water in the oil appear at the time of starting. However, in the case of Patent Document 1, heat exchange between the exhaust gas and the ice block starts after a certain amount of time has elapsed after starting the engine. It is hard to say that they are responding to the request to start the engine without being affected by ice.

  The present invention has been made in view of such a situation, and intends to suppress a problem caused by freezing (freezing) of moisture in oil with a simple structure.

The lubricating device of the present invention is
`` It has an oil pan with an upward opening recess soaked in oil, and a strainer that sucks up oil from the recess, and the suction port of the strainer is fully immersed in the oil. It is formed so that the portion is located above the opening surface of the recess. ''
It is the composition.

  As long as the oil is above the lower limit, the strainer inlet is always immersed in the oil. In particular, when the operation is stopped, the oil flows down to the oil pan, so that the level of the oil level at the start is higher than that during the operation. In addition, oil may move in the oil pan when the vehicle turns, and the oil level may be inclined. However, because the recess is filled with oil, the phenomenon of air suction occurs even if the vehicle turns. There is nothing.

  And since water has a higher specific gravity than oil, when the engine is stopped, the water contained in the oil gradually drops and accumulates in the recesses in the oil pan. If the water is below, the water that has accumulated in the recess freezes and grows into a film that covers the entire opening surface of the recess (the ice film is recessed in the same way that ice forms in the pond). It is presumed that it grows from the opening edge to the center and eventually covers the entire opening surface.)

  However, in the present invention, since a part of the suction opening of the strainer is located higher than the opening surface of the recess, even if an ice film is generated so as to cover the opening surface of the recess, The oil accumulated on the film can be sucked in.

  Therefore, even if the recess is closed with an ice film, it is possible to prevent the occurrence of the idling phenomenon at the time of start-up and supply the oil to each lubrication unit or the like. In addition, since no special member is required and the structure is very simple, it can greatly contribute to cost reduction and fuel efficiency does not deteriorate. Rather, since a part of the suction port of the strainer becomes higher than before, the weight of the strainer becomes lighter than before, and as a result, it can be said that it can contribute to improvement of fuel consumption.

  When a certain amount of time elapses after the engine is started, the ice film formed in the recess is broken or melted by the heat of the heated oil or the flow of oil, and eventually disappears.

It is a figure which shows embodiment and is the top view which displayed the strainer with the virtual line. It is a top view of an oil pan outer tank. 3A is a side view taken along the line IIIA-IIIA of FIG. 2, and FIG. 3B is a rear view taken along the line IIIA-IIIA of FIG. It is a top view of an oil pan inner tank. FIG. 5 is a cross-sectional view taken along line VV in FIG. 1. FIG. 6 is a sectional view taken along line VI-VI in FIG. 1. (A) is the partially broken view which looked at the strainer from the direction of arrow VIIA of Drawing 1, and (B) is a bottom view of a strainer.

(1). Outline Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the front / rear / left / right wording is used to specify the direction, but the crank axis direction is the front / rear direction. As a precaution, the direction is clearly shown in FIG.

  As shown in FIGS. 5 and 6, in this embodiment, the oil pan is a two-tank system including a metal oil pan outer tank 1 and a synthetic resin oil pan inner tank 2. In this way, the two-tank type is configured so that the oil pan inner tank 2 is made of a synthetic resin having a low thermal conductivity, thereby suppressing heat dissipation from the oil and increasing the temperature of the oil early. It is. The parallel oblique lines shown in FIGS. 1, 2, and 4 are for clearly showing the upper surface of the oil pan outer tank 1 or the oil pan inner tank 2, and do not show a cross section.

  Both tanks 1 and 2 are deep in the front half and shallow in the rear half, so that the oil is accumulated in the deep part of the front half. That is, both tanks 1 and 2 have deep bottom portions 1a and 2a in which oil is accumulated in the first half, and shallow bottom portions 1b and 2b in which oil O flows in the second half.

  A flange 3 projecting outward is formed on the upper surface of the oil pan outer tub 1. The left and right flanges 3 and the rear flange 3 are fixed to a cylinder block (not shown), and the front flange 3 is The front cover 4 (see FIGS. 5 and 6) is fixed to the lower surface.

  A flange 5 slightly protruding outward is also formed at the upper end of the oil pan inner tank 2. As shown in FIGS. 5 and 6, the upper end of the oil pan inner tank 2 is positioned slightly below the upper end of the oil pan outer tank 1, and the flange 5 of the oil pan inner tank 2 causes the oil pan outer tank 1 to The distance between the inner side surface and the inner side surface is maintained (the oil pan inner tank 2 includes a portion where the flange 5 does not exist partially). The bottom of the oil pan inner tank 2 is fixed to the oil pan outer tank 1 with screws at a plurality of locations. 1, 2, and 4, the fixed portions of both tanks 1 and 2 are denoted by reference numeral 6.

  The front cover 4 covers a timing chain (not shown), but a crankshaft through hole 7 is opened in the lower part, and an auxiliary machine is attached to the front end of the crankshaft protruding from the front cover 4. A crank pulley (not shown) to be driven is fixed.

  As described above, the substantially first half portions of both tanks 1 and 2 are deep bottom portions 1a and 2a, but a certain amount of space (oil reservoir space) is provided between both deep bottom portions 1a and 2a. And in the deep bottom part 2a of the oil pan inner tank 2, a truncated conical (conical weight) recess 8 is formed which is recessed downward. As shown in FIGS. 1 and 4, the recess 8 is formed close to one side (exhaust side) across the longitudinal center line 9 of both tanks 1 and 2 in plan view. Further, the bottom 8a of the recess 8 is slightly shifted toward the longitudinal center line 9 with respect to the opening surface 9b. Further, a drain hole 10 is formed in the bottom portion 8a far from the longitudinal center line 9 so as to penetrate vertically.

  In the present embodiment, the strainer 11 is attached to the front cover 4. For this reason, the strainer mounting boss portion 12 is formed so as to protrude from the inner surface of the front cover 4, and a triangular flange 12 a is formed at the lower end of the strainer mounting boss portion 12. The oil pump can be configured integrally with the front cover 4 (that is, the front cover 4 can be used as a part of the housing of the oil pump and the rotor can be provided on the crankshaft). ).

(2). Strainer The strainer 11 includes an upper cylinder 13 having a flange 13a at the upper end and a lower cylinder 14 fitted into the upper cylinder 13 from below, and the flange 13a of the upper cylinder 13 is a strainer mounting boss. It is being fixed to the flange 12a of the part 12 with the volt | bolt. A suction port 15 is opened at the lower end of the lower cylinder 14.

  As shown in FIG. 1, the strainer 11 is in a posture facing substantially diagonally from the corner portions of the two tanks 1 and 2 in plan view. For this reason, as shown in FIGS. 5 and 6, the axial center of the strainer 11 is inclined with respect to the vertical line in both the front view and the side view. In this case, in the side view of FIG. 5, the axis of the upper cylinder 13 and the axis of the lower cylinder 14 slightly intersect each other in the side view. Since the strainer 11 is bent, the strainer 11 is composed of the upper cylinder 13 and the lower cylinder 14, but is straight. In such a case, it may be configured by one.

  As clearly shown in FIG. 7, the suction port 15 as a whole has a posture that is obliquely cut with respect to the axis of the lower cylinder 14, and the first inclined portion 16 and the second inclined portion that has stepped down therefrom. 17. The lowermost part 18 and the uppermost part 19 form a boundary between the inclined parts 16 and 17.

  The opening 8b of the recess 8 is horizontal, but the lower part of the first inclined part 16 and the lower part of the second inclined part 17 are the recess 8. The upper part of the first inclined part 16 and the upper part of the second inclined part 17 are located above the opening face 8b. Has been.

  The suction port 15 as a whole has an area of about half that enters below the opening surface 8b (that is, the inside of the recess 8), and an area that is about half is located above the opening surface 8b. . In FIG. 7B, the intrusion portion located below the opening surface 8b is indicated by reference numeral 20, and the area is clearly indicated by a dotted parallel oblique line. The non-intrusion part located on the opening surface 8b is denoted by reference numeral 21.

  As shown in FIG. 1, the suction port 15 of the strainer 11 is slightly offset from the center of the recess 8 toward the longitudinal center line 9. This is because the position of the recess 8 is slightly shifted laterally from the longitudinal center line 9 and the suction port 15 is opened at a position where the oil level of the oil is lowest when the automobile turns. Is.

(3) Summary The lower limit height of the oil level during operation of the engine is, for example, at the position H1 in FIG. 7A, and the lower limit height of the oil level after the engine is stopped is, for example, as shown in FIG. The position is H2. In any case, the entire suction port 15 is immersed in the oil O. When the automobile turns, the oil surface is inclined as indicated by lines 22 and 23 in FIG. 7 due to the movement of the oil O by the inertial force. Even in this case, the suction port 15 is so immersed in the oil O as a whole. Is set. Therefore, the phenomenon that the oil pump sucks air while the automobile is running does not occur.

  On the other hand, when the engine stops, the oil that has traveled around the engine returns to the oil pan. However, since water adheres to the oil in the crank chamber and valve train chamber, the oil in the oil pan contains moisture. Since the moisture contained in the water has a higher specific gravity than oil, it gradually falls and falls into the recess 8.

  The water that has fallen into the recess 8 flows downward from the drain hole 10, but before the drain hole 10 is clogged with dust or the like, and the outside air temperature is very low and falls from the drain hole 10. When freezing begins, water accumulates in the recess 8, and an ice film 24 may be generated so as to cover the opening surface 8 b of the recess 8.

  Accordingly, if the entire suction port 15 of the strainer 11 enters the inside of the recess 8, an empty suction phenomenon in which no oil is sucked up occurs at the next start-up. Since the upper half of the mouth 15 is located on the ice film 24, when the engine is started, the oil O on the ice film 24 is sucked up from the non-intruding portion 21 of the suction mouth 15.

  Therefore, even if the drain hole 10 is blocked for some reason and an ice film 24 is formed in the recess 8, even if the opening surface of the recess 8 is covered with the ice film 24 during operation stop, the start is started. Sometimes the oil pump is not sucked and the oil O can be reliably supplied to each part such as the lubrication part. Therefore, it can be said that the arrangement | positioning aspect of the strainer 11 in this embodiment is supplementing the function of the drain hole 10. FIG. When a certain amount of time has passed since the start, the ice film 24 is broken or melted by the flow of oil or the like, so that the oil O is also sucked up from the intrusion 20.

  As in the embodiment, when the inclined portions 16 and 17 having different heights are formed in the suction port 15 and a part thereof is inserted into the recess 8, the recess is caused by turning, starting, stopping, etc. of the automobile. 8, even if the oil O moves, the movement of the oil O can be suppressed by the wall surface of the lower cylinder 14, so that there is an advantage that the oil suction can be ensured.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, the strainer suction port may be formed in an oblique cut state as a unit. Or it is also possible to form an intrusion part and a non-intrusion part by notching in steps.

  Alternatively, the suction opening of the lateral opening that becomes a non-intruding portion can be cut open upward. Furthermore, it is also possible to open a horizontal suction port of the horizontal hole type in the portion above the opening surface of the recess in the peripheral wall of the strainer while allowing the entire suction port opened downward to enter the inside of the recess. It is.

  Furthermore, the present invention can also be applied to a lubricating device in which the oil pan is a single tank type.

  The present invention can be embodied in a lubricating device for an internal combustion engine. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Oil pan outer tank 2 Oil pan inner tank 4 Front cover 8 Recess 8a Bottom 8b Opening surface 11 Strainer 13 Upper cylinder 14 Lower cylinder 15 Suction port 16, 17 Inclined surface 24 Ice film O Oil

Claims (1)

An oil pan provided with an upwardly opened recess immersed in oil, and a strainer that sucks up oil from the recessed portion, and the suction port of the strainer is partially immersed in the oil. Is formed to be located above the opening surface of the recess,
Lubricating device for automobile internal combustion engine.

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