JP4128497B2 - Double oil pan drain structure and inner container - Google Patents

Description

  The present invention relates to a double oil pan drain structure and an inner container.

  Conventionally, oil has been used for lubrication and cooling of engine parts such as automobiles. Generally, oil is highly viscous in a cold state and is not in a state suitable for lubricating each part of the engine. Therefore, it is desired that the temperature of the oil rises as soon as possible when the engine is started. In order to achieve this object, the applicant of the present invention, as shown in FIG. Developed a configuration with 4 compartments. In the oil pan 1, a suction port 5 of a suction pump for supplying oil to each part of the engine is disposed in the inner chamber 3, and the oil in the inner chamber 3 is preferentially circulated to each part of the engine. . Thereby, compared with the case where all the oil in the oil pan 1 is circulated, it is comprised so that the temperature rise of the oil at the time of engine starting may be accelerated. Further, an inner drain 6 that communicates the inner chamber 3 and the outer chamber 4 is provided at the bottom of the oil pan inner 2, and the oil in the oil pan 8 is extracted from the drain 7 formed at the bottom of the oil pan 1. At this time, the oil in the inner chamber 3 is discharged to the outside of the oil pan 1 through the outer chamber 4.

  Note that the present invention is an improvement of the product of the applicant of the present application, and no prior art document could be found.

  By the way, in the oil pan 1 having the above-described configuration, the suction port 5 of the suction pump is disposed in the vicinity of the bottom of the oil pan inner 2. For this reason, the oil in the outer chamber 4 may flow into the inner chamber 3 through the inner drain 6 due to the suction force when the suction pump sucks the oil. When oil flows into the inner chamber 3 from the outer chamber 4, it becomes difficult to preferentially circulate the oil in the inner chamber 3, and there is a risk that the efficiency of raising the temperature of the oil will be reduced.

  The present invention has been made in view of the above circumstances, and allows the oil inside the oil pan inner to be discharged and the drain structure of the double oil pan capable of efficiently raising the temperature of the oil and the inner container. For the purpose of provision.

  In order to achieve the above object, the drain structure of the double oil pan (10) according to claim 1 is provided with an inner container (12) inside the oil pan (11) and formed on the side wall of the inner container (12). The oil is allowed to flow in and out of the inner container (12) through the oil passage hole (20), and the oil in the inner container (12) is allowed to flow by the oil suction part (23) disposed in the inner container (12). In the drain structure of the double oil pan (10) that is sucked and fed to the engine, the outer drain hole is formed at the bottom of the oil pan (11) and is always closed by the plug (15). (14) and an inner drain hole (24, 60) formed at the bottom of the inner container (12) and opened and closed by the movable valve (25, 50, 61, 70, 80). 25, 50, 1, 70, 80) is always held in a state where the inner drain hole (24, 60) is opened by the urging means, while when the oil suction part (23) sucks the oil, It is characterized in that the inner drain hole (24, 60) is configured to be closed.

  According to a second aspect of the present invention, in the drain structure of the double oil pan (10) according to the first aspect, the inner drain hole (24, 60) penetrates the bottom of the inner container (12) in the vertical direction and is attached. The biasing means is characterized by being gravity.

  According to a third aspect of the present invention, in the drain structure of the double oil pan (10) according to the first or second aspect, the movable valve (25, 50, 61, 70) is free to play in the inner drain hole (24, 60). The fitted shaft portion (26), the locking portion (27, 51, 62) projecting laterally from the inner end of the inner container (12) of the shaft portion (26), and the shaft portion (26) Of the inner container (12), which protrudes laterally from the outer end, and is pressed against the peripheral edge of the inner drain hole (24, 60) by the suction of the oil suction part (23), so that the inner drain hole (24, 60) is characterized in that it is composed of sealing portions (28, 72) for closing.

  According to a fourth aspect of the present invention, in the drain structure of the double oil pan (10) according to the third aspect, the movable valve (25, 50, 61, 70) includes a locking portion (27, 51, 62). The other part provided with the sealing part (28, 72) is characterized in that the one part and the other part are fixed with screws (40).

  According to a fifth aspect of the present invention, in the drain structure of the double oil pan (10) according to the third aspect, the movable valve (25, 50, 61, 70) includes a locking portion (27, 51, 62). The other part provided with the sealing part (28, 72) and the one part and the other part are screwed and fixed by the male and female screw parts (33, 34). Has characteristics.

  According to a sixth aspect of the present invention, in the drain structure of the double oil pan (10) according to the third aspect, the movable valve (25, 50, 61, 70) includes a locking portion (27, 51, 62). And a flexible engaging protrusion (42) formed on one of the one part and the other part. ) Is formed on the other side and has an opening end that is narrower than the engagement protrusion, and is engaged with the inside of the cylinder (41).

  According to a seventh aspect of the present invention, in the drain structure of the double oil pan (10) according to the third aspect, the movable valve (25, 50, 61, 70) includes a locking portion (27, 51, 62). It is composed of one part and another part having the sealing portion (28, 72), and is characterized in that the one part and the other part are joined together by welding or an adhesive.

  The invention of claim 8 is the drain structure of the double oil pan (10) according to any one of claims 3 to 7, wherein the movable valve (50, 61) opens the inner drain hole (24, 60). The inner drain hole (24, 60) is partially covered by the locking portion (51, 62), and the oil is allowed to flow from the uncovered portion.

  The internal container (12) of the double oil pan (10) according to claim 9 is an internal container (12) provided inside the oil pan (11), inside which oil is supplied to the engine. An oil suction part (23) for storing the oil is received, an oil passage hole (20) for allowing oil to pass through the inside and outside of the inner container (12) is formed in the side wall, and a movable valve (25, 50, 61) is formed in the bottom part. , 70, 80) and the inner drain hole (24, 60) is formed, and the movable valve (25, 50, 61) is always opened by the biasing means. On the other hand, when the oil suction part (23) sucks oil, the inner drain hole (24, 60) is closed by the suction force.

  According to a tenth aspect of the present invention, in the inner container (12) of the double oil pan (10) according to the ninth aspect, the inner drain hole (24, 60) penetrates the bottom of the inner container (12) vertically. The biasing means is characterized by being gravity.

  According to an eleventh aspect of the present invention, in the inner container (12) of the double oil pan (10) according to the ninth or tenth aspect, the movable valve (25, 50, 61, 70) has an inner drain hole (24, 60). ) Loosely fitted to the shaft portion (26), the locking portion (27, 51, 62) projecting laterally from the inner end portion of the inner container (12) of the shaft portion (26), and the shaft portion (26) and a sealing portion (28, 72) projecting laterally from the outer end of the inner container (12). By the suction of the oil suction portion (23), the sealing portion (28) Is characterized by being configured to be pressed against the peripheral edge of the inner drain hole (24, 60) to close the inner drain hole (24, 60).

[Inventions of Claims 1 and 8]
In the invention according to claim 1 configured as described above, an inner drain hole (24, 60) communicating the inside and outside of the inner container (12) is formed at the bottom of the inner container (12), and the movable valve (25, 50, 61, 70, 80) are biased by the biasing means so as to open the inner drain holes (24, 60), so that when the oil is not sucked, the oil in the inner container (12) Can flow from the inner drain hole (24, 60) to the outside of the inner container 12, and can be discharged to the outside from the outer drain hole (14) formed in the oil pan (11).

  Further, when oil is sucked into the oil suction portion (23), the movable valve (25, 50, 61, 70, 80) closes the inner drain hole (24, 60) by the suction force. Oil outside the inner container (12) is prevented from flowing into the inside through the holes (24, 60). Thereby, the oil inside the inner container (12) can be supplied to each part of the engine more preferentially, and the temperature can be increased efficiently.

  Here, when the movable valve (50, 61) opens the inner drain hole (24, 60), the inner drain hole (24, 60) is partially covered and covered by the locking portion (51, 62). You may comprise so that oil may flow from the part which did not exist (invention of Claim 8).

[Invention of claim 2]
According to the invention of claim 2, when the oil is not sucked, the movable valve (25, 50, 61, 70, 80) sinks due to gravity and holds the inner drain hole (24, 60) in an open state. Therefore, it is not necessary to separately provide a member for holding the inner drain hole (24, 60) in an open state.

[Invention of Claims 3, 4, 5, 6, 7]
According to the invention of claim 3, when the movable valve (25, 50, 61, 70) is sucked, the inner drain hole (24, 60) is covered with the sealing portion (28, 72), and the inner drain hole is covered. The holes (24, 60) are closed. Further, when the inner drain hole (24, 60) is opened by the urging means, the locking part (27, 51) is locked to the peripheral edge of the inner drain hole (24, 60). Accordingly, the movable valve (25, 50, 61, 70) is prevented from coming off from the inner drain hole (24, 60).

  Here, the movable valve (25, 50, 61, 70) is composed of one part having the locking part (27, 51) and another part having the sealing part (28, 72). A configuration in which one component and another component are fixed with a screw (40) may be adopted (invention of claim 4). In addition, the movable valve (25, 50, 61, 70) has one component with the locking portion (27, 51) and the other component with the sealing portion (28, 72). You may fix by screwing with a screw part (33, 34) (invention of Claim 5). Further, the movable valve (25, 50, 61, 70) is constituted by one part having a locking part (27, 51) and another part having a sealing part (28, 72), A flexible engaging protrusion (42) formed on one of the one part and the other part, and a cylindrical part formed on the other and having an opening end narrower than the engaging protrusion (42) (41) and may be engaged inside the cylindrical portion (41) (invention of claim 6). Furthermore, the movable valve (25, 50, 61, 70) welds or bonds one part having the locking part (27, 51) and another part having the sealing part (28, 72). It is good also as a structure joined by the agent (invention of Claim 7).

[Invention of claim 9]
According to the ninth aspect of the present invention, the inner drain hole (24, 60) opened and closed by the movable valve (25, 50, 61, 70, 80) is formed at the bottom of the inner container (12), and the oil When the valve is not sucked, the movable valve (25, 50, 61, 70, 80) holds the inner drain hole (24, 60) open by the biasing means. Thereby, the oil inside the inner container (12) can be moved from the inner drain hole (24, 60) to the outside of the inner container (12). Therefore, the oil inside the inner container (12) can be discharged to the outside of the oil pan (11).

  Further, when the oil is sucked, the movable valve (25, 50, 61, 70, 80) closes the inner drain hole (24, 60) by the suction force, so that the inner drain hole (24 , 60) to prevent the oil from flowing from the outside to the inside of the inner container (12). Thereby, the oil inside the inner container (12) can be supplied to each part of the engine more preferentially, and the temperature of the oil can be raised efficiently.

[Invention of Claim 10]
According to the invention of claim 10, when the oil is not sucked, the movable valve (25, 50, 61, 70, 80) sinks by gravity and holds the inner drain hole (24, 60) in an open state. Therefore, it is not necessary to separately provide a member for holding the inner drain hole (24, 60) in an open state.

[Invention of Claim 11]
According to the eleventh aspect of the present invention, when the movable valve (25, 50, 61, 70) is sucked, the sealing portion (28, 72) is pressed against the peripheral edge of the inner drain hole (24, 60). The inner drain holes (24, 60) are closed. Further, when the inner drain hole (24, 60) is opened by the urging means, the locking part (27, 51) is locked to the peripheral edge of the inner drain hole (24, 60). Accordingly, the movable valve (25, 50, 61, 70) is prevented from coming off from the inner drain hole (24, 60).

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the accompanying drawings. A double oil pan 10 of the present invention shown in FIG. 1 is assembled to a lower part of an engine (not shown) and stores a predetermined amount of oil. The double oil pan 10 includes an oil pan main body 11 (corresponding to the “oil pan” of the present invention) constituting the outermost part, and an oil pan inner 12 (an “oil pan” of the present invention) assembled inside the oil pan main body 11. Corresponding to an “inner container”. Further, the baffle plate 13 is assembled so as to cover the upper portion of the oil pan inner 12 (see FIG. 2).

  The oil pan body 11 has a container shape opened upward. A drain hole 14 (corresponding to the “outer drain hole” of the present invention) is formed through the bottom wall 11U of the oil pan body 11 at the lowest position when assembled to the engine. A drain bolt 15 is inserted into the drain hole 14 from the outside of the oil pan body 11. When the drain bolt 15 (corresponding to the “plug” of the present invention) is removed from the drain hole 14, the oil in the double oil pan 10 can be discharged to the outside by its own weight.

  The oil pan inner 12 has a container shape corresponding to the shape of the oil pan main body 11 and is open upward. The oil pan inner 12 is fitted inside the oil pan main body 11 so as to cover the inner surface of the oil pan main body 11. A flange portion 16 projecting sideways is formed at a portion near the open end of the oil pan inner 12, and is engaged with a stepped portion 17 formed at the edge of the oil pan main body 11. A baffle plate 13 is covered from above the oil pan inner 12, and a flange portion 16 is sandwiched between the baffle plate 13 and the stepped portion 17. The oil pan inner 12, the oil pan body 11, and the baffle plate 13 are integrally fixed by a plurality of bolts 30 penetrating the baffle plate 13 and the flange portion 16. The baffle plate 13 has a plate shape with irregularities, covers the upper end opening of the oil pan inner 12, and restricts the oil in the oil pan inner 12 from moving upward.

  The inner space of the oil pan body 11 is partitioned into two chambers by an oil pan inner 12. That is, an outer chamber 18 formed between the oil pan inner 12 and the oil pan main body 11 and an inner chamber 19 formed inside the oil pan inner 12 are formed inside the oil pan main body 11. Yes. Here, the lower part of the oil pan inner 12 than the flange portion 16 is separated from the side wall 11S and the bottom wall 11U of the oil pan main body 11. That is, the entire inner chamber 19 is surrounded by the outer chamber 18.

  Incidentally, an oil pump (not shown) for sucking the oil in the double oil pan 10 and feeding it to each part of the engine is provided above the double oil pan 10. An oil pipe 22 extends from the oil pump into the double oil pan 10. The oil pipe 22 is disposed inside the oil pan inner 12, that is, in the inner chamber 19. A suction port 23 (corresponding to the “oil suction part” of the present invention) formed at the tip of the oil pipe 22 is also disposed in the inner chamber 19. More specifically, since the suction port 23 is disposed in the vicinity of the bottom wall 12U of the oil pan inner 12, when the oil pump is driven, the bottom of the oil pan inner 12 of the oil in the inner chamber 19 is driven. Oil in the vicinity of the wall 12U is sucked. The oil sucked from the suction port 23 comes into contact with each part of the engine, and after each part is lubricated and cooled, it is dropped from above the double oil pan 10 and returned to the inner chamber 19 again. Yes. Since the oil is warmed by contacting each part of the engine, the temperature of the oil in the inner chamber 19 is raised faster than the oil in the outer chamber 18. The suction port 23 is provided with a strainer (not shown) to prevent foreign matter in the oil from being sucked.

  The side holes 12S and 12S of the oil pan inner 12 are formed with through holes 20 and 20 (corresponding to “oil passage holes” of the present invention) that communicate the outer chamber 18 and the inner chamber 19 with each other. By these lateral holes 20, 20, oil is appropriately circulated between the inner chamber 19 and the outer chamber 18. Specifically, while the viscosity of the oil is high, the inflow of oil from the outer chamber 18 to the inner chamber 19 is suppressed, and when the oil is warmed and the viscosity decreases, the oil flows from the outer chamber 18 to the inner chamber 19. It becomes like this. As a result, immediately after the engine is started, the inflow of oil from the outer chamber 18 to the inner chamber 19 is suppressed, the temperature rise of the oil in the inner chamber 19 is promoted, and after the oil has been warmed appropriately, The oil in the inner chamber 19 is prevented from becoming extremely hot.

  Now, in the bottom wall 12U of the oil pan inner 12, more specifically, in the bottom wall 12U, the lowest position of the oil pan inner 12 when the double oil pan 10 is assembled to the engine, An inner drain hole 24 communicating with the chamber 19 is formed. The inner drain hole 24 penetrates the bottom wall 12U of the oil pan inner 12 in the vertical direction and has a circular cross-sectional shape. A movable valve 25 that opens and closes the inner drain hole 24 is assembled to the inner drain hole 24. The cross-sectional shape of the inner drain hole 24 is not limited to a circle.

  As shown in FIG. 3, the movable valve 25 includes a locking portion 27 and a sealing portion 28 at both ends of a shaft portion 26 that penetrates the inner drain hole 24. The shaft portion 26 has a cylindrical shape that is slightly tapered from the outer chamber 18 side toward the inner chamber 19 side (from the lower side to the upper side in FIG. 3) (see FIG. 4). The shaft portion 26 is loosely fitted in the inner drain hole 24, and a gap 29 is formed between the inner peripheral surface of the inner drain hole 24. The gap 29 allows the inner chamber 19 and the outer chamber 18 to communicate with each other in the inner drain hole 24 even when the shaft portion 26 of the movable valve 25 is inserted into the inner drain hole 24.

  The sealing portion 28 protrudes laterally from the end portion of the shaft portion 26 on the outer chamber 18 side, and has a disk shape. The diameter of the sealing portion 28 is larger than the diameter of the inner drain hole 24, and when the movable valve 25 is in the upper end position, that is, the position closer to the inner chamber 19, the sealing portion 28 becomes the inner drain hole. The inner drain hole 24 is prevented from coming off by being locked to the peripheral edge of the inner wall 24. Further, in the sealing portion 28, the facing surface 28 </ b> F facing the oil pan inner 12 is a flat surface. When the sealing portion 28 is locked to the peripheral edge of the inner drain hole 24, the facing surface 28 </ b> F and the oil The inner drain hole 24 is covered from the outer chamber 18 side by tightly contacting the outer (outer chamber 18 side) surface of the pan inner 12. As a result, the inner chamber 19 and the outer chamber 18 are blocked at the inner drain hole 24. In the present embodiment, the sealing portion 28 has a disk shape, but is not limited to this as long as the entire inner drain hole 24 can be covered.

  The locking portion 27 has a disk shape projecting sideways from the end portion of the shaft portion 26 on the inner chamber 19 side. The diameter of the locking portion 27 is slightly smaller than the sealing portion 28 and larger than the inner drain hole 24. A stopper wall 39 extending toward the bottom wall 12U of the oil pan inner 12 is formed on the surface of the locking portion 27 facing the oil pan inner 12. The stopper wall 39 is curved in an arc shape, and is provided at three intervals on the periphery of the locking portion 27 at equal intervals.

  When the movable valve 25 is in the lower end position, that is, closer to the outer chamber 18, the stopper wall 39 provided in the locking portion 27 is abutted against the peripheral edge portion of the inner drain hole 24. Then, an opening 32 communicating with the inner drain hole 24 is formed between the locking portion 27 and the oil pan inner 12, and the sealing portion 28 is separated from the oil pan inner 12. That is, both end portions of the inner drain hole 24 are opened, and the inner chamber 19 and the outer chamber 18 are in communication with each other through the inner drain hole 24.

  Here, as shown in FIG. 4, the movable valve 25 of the present embodiment includes a shaft portion 26 and a sealing portion 28 that are integrally formed as one component, and the locking portion 27 is different from this. It is a part. Then, by engaging the male screw portion 33 protruding from the center of the locking portion 27 with the female screw portion 34 formed on the shaft portion 26, the locking portion 27 is fixed to the shaft portion 26. The stop portion 27, the shaft portion 26, and the sealing portion 28 are integrally formed.

  When the movable valve 25 is assembled to the oil pan inner 12, first, the shaft portion 26 is inserted into the inner drain hole 24 from the outside of the oil pan inner 12, and then the shaft portion 26 and the locking portion 27 are screwed together. Good. Thus, since the movable valve 25 is detachable with respect to the oil pan inner 12, the movable valve 25 assembled | attached to the oil pan inner 12 can be replaced | exchanged.

  Suitable materials for the movable valve 25 include, for example, alloy materials such as steel, aluminum, magnesium, and titanium, and resin materials such as polyamide resin, saturated polyester resin, fluororesin, phenol resin, polyimide resin, and polyamideimide resin. ing. In addition, if it is excellent in heat resistance and is a lightweight material, it will not restrict to this.

Next, the operation of this embodiment will be described.
When the engine is stopped, that is, when the oil pump is stopped, as shown in FIG. 5, the movable valve 25 sinks to the lower end position by its own weight. At this time, the stopper wall 39 provided on the locking portion 27 of the movable valve 25 is abutted and locked against the bottom wall 12U of the oil pan inner 12, and the sealing portion 28 is separated from the oil pan inner 12. is doing. The inner chamber 19 and the outer chamber 18 are in communication with each other via the inner drain hole 24.

  Here, when oil is extracted from the double oil pan 10, it is as follows. When the drain bolt 15 of the oil pan body 11 is pulled out, the oil in the outer chamber 18 is discharged from the drain hole 14 by its own weight, and the oil in the inner chamber 19 also gradually goes out through the inner drain hole 24. It flows into the chamber 18 and is discharged from the drain hole 14 to the outside of the double oil pan 10. Since the inner drain hole 24 is formed at the lowest position of the bottom wall 12U of the oil pan inner 12, more oil can be discharged from the inner chamber 19. Therefore, when oil is changed, old oil remains inside the oil pan inner 12 (inside the inner chamber 19), so that deterioration of new oil after replacement can be prevented from being accelerated.

  Now, when the engine starts, the oil pump starts. When the oil pump is started, the oil in the inner chamber 19 is sucked from the suction port 23 and supplied to each part of the engine through the oil pipe 22. Then, the oil that has lubricated and cooled each part of the engine is dropped from above the double oil pan 10 and returned again into the inner chamber 19 of the double oil pan 10. Since the oil is warmed in contact with each part of the engine, the temperature of the oil in the inner chamber 19 gradually increases. Moreover, since the viscosity of the oil is high immediately after the engine is started, the inflow of oil from the lateral hole 20 into the inner chamber 19 is suppressed, and the oil in the inner chamber 19 is preferentially circulated. Thereby, the temperature rise of oil is promoted.

  When the oil pump is driven, oil stored in the vicinity of the bottom wall 12U of the oil pan inner 12 in the inner chamber 19 is sucked into the suction port 23. Then, as with this oil, the movable valve 25 attached to the bottom wall 12U floats to the suction port 23 side, that is, the inner chamber 19 side, as shown in FIG. 6, by the suction force of the oil pump.

  When the movable valve 25 floats to the inner chamber 19 side, the sealing portion 28 of the movable valve 25 is locked to the peripheral edge portion of the inner drain hole 24. At this time, the sealing portion 28 is in close contact with the oil pan inner 12, and the inner drain hole 24 is closed. While the oil is sucked into the suction port 23 by the oil pump, the state where the movable valve 25 is sucked toward the inner chamber 19 side, that is, the state where the inner drain hole 24 is closed is maintained. Thereby, when the oil in the inner chamber 19 is sucked into the suction port 23 by the oil pump, the oil in the outer chamber 18 is prevented from flowing into the inner chamber 19 through the inner drain hole 24. Therefore, the oil in the inner chamber 19 can be circulated to each part of the engine more preferentially.

  As described above, according to this embodiment, when the movable valve 25 is assembled to the inner drain hole 24 formed in the bottom wall 12U of the oil pan inner 12 and the oil pump is stopped, the movable valve 25 settles by its own weight. Then, the inner chamber 19 and the outer chamber 18 are brought into communication. As a result, the oil in the inner chamber 19 can flow into the outer chamber 18 from the inner drain hole 24 and can be extracted from the drain hole 14 of the oil pan body 11. Further, when the oil pump is driven, the movable valve 25 is lifted to the inner chamber 19 side by the suction force of the oil pump, and the inner drain hole 24 is closed by the sealing portion 28. This prevents oil in the outer chamber 18 from flowing into the inner chamber 19 through the inner drain hole 24 when the oil pump is sucking oil, giving priority to the oil in the inner chamber 19. Can be supplied to each part of the engine. Accordingly, the temperature of the oil can be raised efficiently.

[Second Embodiment]
FIG. 7 shows a second embodiment of the present invention. In the second embodiment, the configuration of the locking portion provided in the movable valve is different from that of the first embodiment, and the other configurations are the same as those of the first embodiment. Therefore, the same configurations are the same. Reference numerals are assigned, and duplicate descriptions are omitted.

  The locking part 51 of the movable valve 50 of the present embodiment protrudes laterally from a position 120 ° apart from the end of the shaft part 26 on the inner chamber 19 side.

  When the movable valve 50 settles toward the outer chamber 18 due to its own weight, the three end portions 51A of the locking portion 51 are locked to the edge portion of the inner drain hole 24. At this time, the inner drain hole 24 is partially covered by the locking portion 51, but the portion sandwiched between the projecting pieces 51 </ b> A is not covered by the locking portion 51 and opens to the inner chamber 19 side. Yes. As a result, the oil in the inner chamber 19 can flow into the outer chamber 18 through a portion not covered with the locking portion 51 of the inner drain hole 24.

[Third Embodiment]
FIG. 8 shows a third embodiment of the present invention. In the third embodiment, the shape of the inner drain hole is different from that of the first embodiment, and other configurations are the same as those of the first embodiment. The inner drain hole 60 of the present embodiment has a substantially Y-shaped cross section in the axial direction. When the movable valve 25 sinks due to its own weight, the three portions of the edge portion of the locking portion 27 are locked to the edge portion of the inner drain hole 60 on the inner chamber 19 side. At this time, the inner drain hole 60 is partially covered by the locking portion 27, but the front end portion 60 </ b> A of the inner drain hole 60 is not covered by the locking portion 27 and opens to the inner chamber 19 side. Thereby, the oil in the inner chamber 19 can flow into the outer chamber 18 through a portion of the inner drain hole 60 that is not covered with the locking portion 27.

[Fourth Embodiment]
FIG. 9 shows a fourth embodiment of the present invention. In the fourth embodiment, the structure of the movable valve is different from that of the first embodiment, and other configurations are the same as those of the first embodiment. In the movable valve 70 of the present embodiment, the shaft portion 26 pivotally supports a coil spring 71 (corresponding to the “biasing means” of the present invention), and the sealing portion 72 has a cap shape with one end. ing. Both end portions of the coil spring 71 are in contact with the peripheral edge portion of the inner drain hole 24 of the oil pan inner 12 and the upper surface of the sealing portion 72, and urge the sealing portion 72 in a direction away from the oil pan inner 12. ing.

  When the oil pump is stopped, the sealing portion 72 is separated from the oil pan inner 12 by the urging force of the coil spring 71, and the inner drain hole 12 is opened (state of FIG. 9). On the other hand, when the oil pump is sucking oil, the movable valve 70 floats while pressing and contracting the coil spring 71, and the peripheral wall 73 of the sealing portion 72 is abutted against the oil pan inner 12. As a result, the inner drain hole 12 is closed. Also according to this embodiment, an effect equivalent to that of the first embodiment is obtained.

[Fifth Embodiment]
FIG. 10 shows a fifth embodiment of the present invention. The fifth embodiment is different from the first embodiment in the structure of the movable valve, and the other configurations are the same as those in the first embodiment. The movable valve 80 of the present embodiment has a flat plate shape and is attached to the bottom of the oil pan inner 12 by a hinge 81. Further, the hinge 81 pivotally supports a torsion spring 82, one end of the torsion spring 82 is fixed to the oil pan inner 12, and the other end is fixed to the movable valve 80. The torsion spring 82 urges the movable valve 80 to rotate toward the outer chamber 18 around the hinge 81.

  When the oil pump is stopped, the movable valve 80 is rotated toward the outer chamber 18 centering on the hinge 81 by the biasing force of the torsion spring 82, and the inner drain hole 24 is opened (the state shown in FIG. 10). ). On the other hand, when the oil pump is sucking oil, the movable valve 81 is rotated toward the suction port 23 by the suction force, and the movable valve 80 is fitted in the inner drain hole 24. Thereby, the inner drain hole 24 is closed. Also according to this embodiment, an effect equivalent to that of the first embodiment is obtained.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following are within the scope not departing from the gist. It can be changed and implemented.
(1) In the first embodiment, the movable valve 25 has a configuration in which the shaft portion 26 integrally provided with the sealing portion 28 and the locking portion 27 are screwed together, but as shown in FIG. You may fix the axial part 26 and the latching | locking part 27 which were integrally provided with the sealing part 28 with the bis | screw 40 which penetrated the latching | locking part 27. FIG.

  Further, as shown in FIG. 12, a flexible engaging projection 42 having a stepped end is formed upright on the locking portion 27, and an upper end opening is formed on the sealing portion 28. The cylindrical portion 41 that is narrower than the portion 42 is formed upright, and the engaging protrusion 42 is inserted into the hole 44 formed in the cylindrical portion 41, thereby engaging the inner peripheral surface of the cylindrical portion 41. It is good also as a structure which engaged the part 41. FIG.

  Further, as shown in FIG. 13, the end portion of the shaft portion 26 integrally provided with the locking portion 27 is inserted into the through hole 43 penetrating the central portion of the sealing portion 28, and this insertion portion is welded or You may join with an adhesive agent.

(2) In the first embodiment, the stopper wall 39 is provided on the surface of the locking portion 27 facing the oil pan inner 12. However, the stopper wall 39 is provided on the peripheral portion of the inner drain hole 24 of the oil pan inner 12. Also good.

(3) In the fifth embodiment, the inner drain hole 24 is opened by the biasing force of the torsion spring 82 when the oil pump is not sucking oil. The inner drain hole 24 may be opened.

Sectional drawing of the double oil pan which concerns on 1st Embodiment of this invention. Top view of double oil pan Perspective view of movable valve Cross section of movable valve Cross section of double oil pan when oil pump is stopped Cross section of double oil pan when oil pump is driven Plan view of movable valve and inner drain hole according to second embodiment Plan view of movable valve and inner drain hole according to third embodiment Side sectional view of movable valve and inner drain hole according to fourth embodiment Side sectional view of movable valve and inner drain hole according to fifth embodiment Sectional drawing of the movable valve in other embodiment (1) Sectional drawing of the movable valve in other embodiment (1) Sectional drawing of the movable valve in other embodiment (1) Cross section of conventional oil pan

Explanation of symbols

10 Double oil pan 11 Oil pan body (oil pan)
12 Oil pan inner (inner container)
16 Drain hole (outside drain hole)
23 Suction port (oil suction part)
24,60 Inner drain hole (inner drain hole)
25, 50, 61, 70, 80 Movable valve 26 Shaft portion 27, 51, 62 Locking portion 28, 72 Sealing portion 33 Male screw portion 34 Female screw portion 40 Screw 41 Tube portion 42 Engaging protrusion

Claims (11)

An internal container (12) is provided inside the oil pan (11) so that oil flows into and out of the internal container (12) through an oil passage hole (20) formed in the side wall of the internal container (12). In the drain structure of the double oil pan (10), the oil in the inner container (12) is sucked and supplied to the engine by the oil suction part (23) disposed in the inner container (12). ,
An outer drain hole (14) formed in the bottom of the oil pan (11) and always closed with a plug (15);
An inner drain hole (24, 60) formed at the bottom of the inner container (12) and opened and closed by a movable valve (25, 50, 61, 70, 80);
The movable valve (25, 50, 61, 70, 80) is always held in a state where the inner drain hole (24, 60) is opened by the biasing means, while the oil suction part (23) supplies oil. The drain structure of the double oil pan (10), wherein the inner drain hole (24, 60) is closed by the suction force when sucked.   The double oil pan (1) according to claim 1, wherein the inner drain hole (24, 60) vertically penetrates the bottom of the inner container (12), and the biasing means is gravity. 10) The drain structure. The movable valve (25, 50, 61, 70) includes a shaft portion (26) loosely fitted in the inner drain hole (24, 60),
A locking portion (27, 51, 62) projecting laterally from the inner end of the inner container (12) of the shaft portion (26);
The shaft portion (26) projects laterally from the outer end of the inner container (12) and is pressed against the peripheral edge portion of the inner drain hole (24, 60) by the suction of the oil suction portion (23). The drain structure of the double oil pan (10) according to claim 1 or 2, characterized in that the drain structure is composed of a sealing portion (28, 72) for closing the inner drain hole (24, 60). .   The movable valve (25, 50, 61, 70) is composed of one part having the locking part (27, 51, 62) and another part having the sealing part (28, 72). The drain structure of the double oil pan (10) according to claim 3, characterized in that said one part and the other part are fixed with screws (40).   The movable valve (25, 50, 61, 70) is composed of one part having the locking part (27, 51, 62) and another part having the sealing part (28, 72). The drain structure of the double oil pan (10) according to claim 3, characterized in that the one part and the other part are screwed and fixed by male and female screw parts (33, 34).   The movable valve (25, 50, 61, 70) is composed of one part having the locking part (27, 51, 62) and another part having the sealing part (28, 72). A flexible engaging protrusion (42) formed on one of the one part and the other part is formed on the other, and the opening end is formed on the other than the engaging protrusion (42). The drain structure of the double oil pan (10) according to claim 3, wherein the drain structure is inserted into a narrow cylinder (41) and engaged inside the cylinder (41).   The movable valve (25, 50, 61, 70) is composed of one part having the locking part (27, 51, 62) and another part having the sealing part (28, 72). The drain structure of the double oil pan (10) according to claim 3, characterized in that the one part and the other part are joined together by welding or an adhesive.   When the movable valve (50, 61) opens the inner drain hole (24, 60), the inner drain hole (24, 60) is partially covered by the locking portion (51, 62). The drain structure of the double oil pan (10) according to any one of claims 3 to 7, characterized in that the oil flows from a portion that is not broken. An internal container (12) provided inside the oil pan (11),
Inside, an oil suction part (23) for feeding oil to the engine is housed,
An oil passage hole (20) through which oil passes inside and outside of the inner container (12) is formed on the side wall,
An inner drain hole (24, 60) that is opened and closed by a movable valve (25, 50, 61, 70, 80) is formed at the bottom,
The movable valve (25, 50, 61, 70, 80) is always held in a state where the inner drain hole (24, 60) is opened by the biasing means, while the oil suction part (23) supplies oil. The inner container (12) of the double oil pan (10), wherein the inner drain hole (24, 60) is closed by the suction force when sucked.   The double oil pan (10) according to claim 9, wherein the inner drain hole (24, 60) vertically penetrates the bottom of the inner container (12), and the biasing means is gravity. 10) Inner container (12). The movable valve (25, 50, 61, 70) includes a shaft portion (26) loosely fitted in the inner drain hole (24, 60),
A locking portion (27, 51, 62) projecting laterally from the inner end of the inner container (12) of the shaft portion (26);
The shaft portion (26) includes a sealing portion (28, 72) projecting laterally from an outer end portion of the inner container (12),
By the suction of the oil suction part (23), the sealing part (28, 72) is pressed against the peripheral part of the inner drain hole (24, 60) to close the inner drain hole (24, 60). The internal container (12) of the double oil pan (10) according to claim 9 or 10, characterized in that it is configured as described above.

Images