JP2017180331A - Two-tank oil pan for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that a strainer 8 causes a suction failure due to the growth of a water component in oil to a water droplet, and a freeze of the water droplet.SOLUTION: An oil pan is of a double-tank type composed of an inner tank 1 and an outer tank 2, and a recess 9 into which a suction port of a strainer 8 is inserted is formed at a deep bottom 6 of the inner tank 1. A communication groove 10 which communicates with the recess 9 at one end, and is remote from the recess 9 at the other end is formed in the inner tank 1, and a small hole 12 for moving a water droplet 15 to the outer tank 2 is formed at a terminal end of the communication groove 10. Since the water droplet 15 which has moved to the outer tank 2 does not return to the inner tank 1, there does not arise a problem resulting from a freeze of the water droplet 15.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a two-tank oil pan for use in an internal combustion engine, and is particularly suitable for an oil pan used in a vehicle internal combustion engine.

  2. Description of the Related Art In an internal combustion engine, it is widely performed to configure an oil pan in a two-tank type in order to increase the temperature of oil early. In this two-tank type oil pan, a strainer is immersed in an inner tank. One problem that occurs with oil pans, not limited to single-layer and double-tank types, is that water drops accumulate at the bottom of the oil pan and freeze in a low-temperature environment, and this ice clogs the strainer filter. Oil shortage may be caused.

  In this regard, Patent Document 1 discloses that, in a single-layer oil pan, a deep staying part in which water droplets are accumulated at the bottom is formed and the staying part is covered with a mesh. In this Patent Document 1, water droplets are collected in a deep retention part, and even if the water droplets freeze, they are prevented from being sucked into the strainer by the mesh.

Japanese Patent Laying-Open No. 2015-194144

  Now, in an oil pan of an internal combustion engine for a vehicle, the oil level greatly fluctuates due to the inclination, start, stop, etc. of the vehicle. Therefore, a recess that is always filled with oil is formed in a part of the bottom of the oil pan even when the oil level fluctuates, and the oil is often sucked from the recess by a strainer.

  However, in Patent Document 1, the staying portion is deepest and the suction of the strainer is higher than the staying portion. Therefore, when applied to a vehicle, the strainer may not absorb oil due to oil level fluctuations. There was no problem. In addition, when a mesh is provided, there is a problem that the cost increases accordingly.

  Furthermore, Patent Document 1 discloses that if the oil freezes before flowing into the staying part, the problem that the suction to the strainer cannot be prevented or the water droplets cannot be isolated, and if the oil temperature rises and the water drops from the ice, May cause a phenomenon that the mesh passes through the mesh and is returned to the outside of the staying portion, which is not a radical measure.

  The present invention has been made to improve such a current situation, and intends to eliminate the problem of water droplets by utilizing the structure of a two-tank oil pan.

The present invention has an outer tub and an inner tub, and in the inner tub, a two-tank type in which a recess to be a suction portion by a strainer is formed is an oil pan.
In the inner tub, a narrow communication groove having one end communicating with the recess and the other end separated from the recess is formed such that the bottom surface is as high as or lower than the bottom surface of the recess, A small hole having a size through which water droplets generated in the oil can pass is formed at the bottom of the communication groove.

  In the present invention, it is possible to make a plurality of small holes in one communication groove, but one is usually sufficient (in order to suppress the inflow of oil from the outer tank, the necessary minimum is preferable). It is also possible to form a plurality of communicating grooves and form small holes in each communicating groove. In addition, as to where the small hole is to be opened in the communication groove, it is certain that the small hole will be opened at the other end of the communication groove in order to prevent the oil from being sucked from the outer tank, but the oil from the outer tank is not sucked up. If there is not, you may leave in the suitable part between one end and the other end.

  In the present invention, since the concave portion where the tip of the strainer faces is deep, even if the oil pan is tilted or the oil swings in the oil pan, the strainer tip is always immersed. it can. Therefore, functions such as lubrication and oil jet cooling can be exhibited accurately.

  Further, since the communication groove is narrow, oil does not move greatly from the communication groove to the outside of the recess even when the oil pan swings, and the oil in the recess can be stored. Therefore, the oil in the recess is not reduced and air is not sucked from the strainer. That is, the function of the recess that is always filled with oil is not impaired.

  Furthermore, since the small hole has a small diameter and is positioned outside the recess, it is possible to prevent the suction force of the strainer from acting on the small hole. Therefore, it is possible to prevent the oil in the outer tank from being sucked into the inner tank from the small hole. For this reason, the function of circulating the oil in the inner tank to raise the temperature of the oil early is not impaired, and there is no hindrance to the early warm-up.

  Then, water droplets (or ice particles) generated by condensation of water in the oil flow into the recesses while floating on the oil flow. Therefore, the water droplets that reach the bottom of the concave portion behave to be pushed to the outer peripheral side of the concave portion due to oil swinging or the like, and therefore enter the communication groove while swinging at the bottom of the concave portion, and the movement of the oil Is pushed toward the other end of the communication groove and eventually passes through the small hole and enters the outer tub.

  Since the oil in the outer tank is not subjected to the suction action by the strainer, the strainer filter is not clogged even if water droplets freeze. Therefore, even if water droplets are generated in the inner tank, the adverse effects can be prevented. And since a water droplet is excluded from an inner tank, there is no case where a water drop gradually increases in an inner tank, and it is a radical measure. And since a communicating groove is manufactured as a part of inner tank, cost can also be suppressed.

  A drain hole is provided at the bottom of the outer tank to drain the oil when changing the oil. If a small hole through which water drops pass is positioned above the drain hole, the water drops transferred to the outer tank are replaced with oil. There is an advantage that can be extracted from time to time.

It is a top view of a 1st embodiment. It is the II-II sectional view taken on the line of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. It is sectional drawing of 2nd Embodiment.

  Next, an embodiment of the present invention will be described with reference to the drawings. First, the first embodiment shown in FIGS. The oil pan is composed of an inner tank 1 made of synthetic resin and an outer tank 2 made of metal such as an aluminum die-cast product or a sheet metal processed product. A flange 3 fixed to the cylinder block is formed at the upper end of the outer tub 2. The inner tank 1 is fixed to the outer tank 2 with screws. For this reason, the support seat 4 which overlaps the boss | hub part (not shown) of the outer tank 2 is formed in the inner tank 1 so that it jumped along the circumferential direction.

  The inner tub 1 and the outer tub 2 are not deeply formed as a whole, and when looking at the inner tub 1, as shown in FIG. The shallow bottom portion 5 where the oil does not collect is formed, and almost half of the other short side 1b is the deep bottom portion 6 where the oil is collected.

  In the deep bottom portion 6, a concave portion 9 serving as a suction portion by the strainer 8 is formed in a portion recessed toward the shallow bottom portion 5 and slightly deviated from the longitudinal center line 7. The recess 9 has an inverted trapezoidal cross section cut by a vertical plane, but can also be formed in a quadrilateral or semicircular shape.

  As shown in FIG. 3, the deep bottom portion 6 of the inner tub 1 has a basic shape in which the depth increases from one longitudinal side surface 1 c side to the other longitudinal side surface 1 d side. To one longitudinal side surface 1c.

  And the 1st communicating groove 10 shown as a continuous line and the 2nd communicating groove 11 shown with a dashed-dotted line are formed in the inner tank 1, and the small hole 12 is pierced at the front-end | tip of each communicating groove 10,11. Either one of the first communication groove 10 and the second communication groove 11 can be selected and provided, or both can be provided.

  The groove widths of both the communication grooves 10 and 11 are as narrow as several mm, and the bottom surface has one end substantially the same height as the bottom surface of the recess 9 and slightly lowers as it moves away from the recess 9 to the other end. Inclined with respect to the horizontal. A small hole 12 is formed at the tip of the communication grooves 10 and 11. The bottoms of the communication grooves 10 and 11 may be set horizontally at the same height as the bottom of the recess 9.

  In the outer tub 2, below the small hole 12, a drain hole 13 for extracting oil at the time of oil replacement is located. The drain hole 13 is closed with a plug 14. Although the drain hole 13 is displayed in both FIG. 3 and FIG. 4, when both the communicating grooves 10 and 11 are provided, only one of the drain holes 13 is provided.

  In the above configuration, when water is floating in the oil, the water aggregates to form water droplets 15, and the water droplets 15 move to the lowest recess 9. Then, the water droplet 15 reaching the concave portion 9 is placed on the shaking of the oil, hits the outer periphery of the concave portion 9, or moves along the edge of the concave portion 9, and enters the communication grooves 10 and 11 in the course. After entering the communication grooves 10, 11, the oil is pushed to the back by the pushing action by the swing of the oil, reaches the other end, and moves from the small hole 12 to the outer tank 2.

  Since the water drops 15 reaching the outer tank 2 do not return to the inner tank 1, the water drops 15 are not repeatedly frozen or melted in the inner tank 1. For this reason, the water drop 15 does not adhere to the filter of the strainer 8 and the oil suction amount does not decrease. Water droplets 15 can flow into the communication grooves 10 and 11 from the outside of the recess 9.

  In the first embodiment, the small hole 12 is provided at the end (the other end) of the communication grooves 10 and 11. However, in the second embodiment shown in FIG. 5, the gap between one end and the other end of the communication groove 16. A downward bulging portion 17 is formed at an intermediate portion, and a small hole 12 is formed in the downward bulging portion 17. When the water droplet 15 falls into the downward bulging portion 17, the water droplet 15 does not return to the concave portion 9, so that the water droplet 15 can be made harmless.

  The communication groove is not limited to one or two, and three or more communication grooves can be formed radially. It is also possible to provide a rib for guiding the water droplet 15 toward the communication groove on the outer surface of the recess 9 in the bottom surface of the deep bottom portion 6. The communication groove is not limited to a linear shape, and may be bent in plan view.

  The present invention can be embodied in a two-tank oil pan. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Inner tank 2 Outer tank 6 Deep bottom part 9 Recessed part 10,11,16 Communication groove 12 Small hole 13 Drain hole of outer tank 15 Water drop

Claims (1)

It has an outer tub and an inner tub, and the inner tub has a recess formed as a suction portion by a strainer,
In the inner tub, a narrow communication groove having one end communicating with the recess and the other end separated from the recess is formed such that the bottom surface is as high as or lower than the bottom surface of the recess, A small hole having a size through which water droplets generated in oil can pass is formed at the bottom of the communication groove.
Two-tank oil pan for internal combustion engines.

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