JP5858661B2 - Oil pan structure - Google Patents

Description

  The present invention relates to an oil pan structure that controls the flow of oil in the oil pan.

  In order to form a certain oil film on the surface of the metal parts, the oil stored in the oil pan is sucked up through the oil strainer and goes around the engine, and the returned oil is collected by the collecting pipe and collected in the oil pan. Stored.

  At the time of warming up, the temperature in the oil pan is also low, and the returned oil is diffused in the stored oil and the temperature is likely to decrease. As described above, since the temperature is lowered before it is sucked up again by the oil strainer, the efficiency is not good at the time of warm-up when it is desired to raise the temperature early.

  Therefore, conventionally, a configuration has been considered in which oil is efficiently sucked from an oil strainer in a relatively high temperature state.

  FIG. 8 is a cross-sectional view showing the structure of an oil pan 102 for a conventional engine 100. As shown in FIG. 8, the oil suction port 104a of the oil strainer 104 has a shape that is greatly expanded. Further, the downstream end portion 103a of the collection tube 103 is disposed with the outlet facing the lower side of the expanded oil suction port 104a. Furthermore, a diffusion prevention mechanism 105 is provided on the inlet side of the collection tube 103. This diffusion prevention mechanism 105 is inclined and guided to the inlet side of the collection pipe 103 during warm-up operation, thereby preventing the return oil from diffusing over a wide area of the oil pan 102, and efficiently returning the high-temperature return oil. It is a mechanism that can be well collected in the collection tube 103.

  With such a mechanism, during warm-up operation, high-temperature oil is guided directly below the oil suction port 104a, so that the temperature of the engine 100 can be raised at an early stage, thereby improving fuel efficiency. It is possible to plan. Such a configuration is disclosed in Patent Document 1, for example.

  Further, the inventors of the present application have considered a configuration in which the inside of the oil pan is formed in a layered manner so that warm-up can be promoted. This configuration is shown in FIG. As shown in FIG. 9, the oil pan 200 has partition walls 205 formed along the bottom surface and side walls, and has a double structure as a whole. The partition wall 205 is formed with through holes 205a at a plurality of locations, and oil can be diffused between the inner layer 203 and the outer layer 204.

  With this configuration, the oil in the oil pan 200 is not vigorously agitated during warm-up, unlike during running, so that the relatively high temperature oil returned from the cylinder head via the collection tube 202 is mostly Circulates in the inner layer 203, and a part thereof passes through the through hole 205a and flows to the outer layer 204 side. For this reason, oil in the inner layer 203 having a high temperature can be sucked up preferentially from the strainer 201 and circulated, so that the efficiency of warm-up can be improved and the fuel efficiency can be improved.

  Further, according to this configuration, since the whole vibrates vigorously during traveling, there is almost no oil temperature difference between the inner layer 203 and the outer layer 204, and only high-temperature oil does not circulate preferentially.

JP 59-183017 A

  However, in the structure shown in FIG. 8, although the rate of sucking up the high temperature return oil is increased and the efficiency of warm-up can be improved, since the suction port is large, the temperature stored in the oil pan is relatively high. A lot of low oil is also sucked up. For this reason, the oil temperature cannot be raised quickly.

  Further, in the structure shown in FIG. 9, oil that is stable at a relatively high temperature exists in the vicinity of the suction port of the strainer 201 at the time of warming up. It is possible to get. However, in a small displacement engine with a small amount of oil, the oil in the inner layer is reduced at a very low temperature, and so-called “empty suction” may occur.

  Accordingly, in order to solve the above-described problems, an object of the present invention is to provide an oil pan structure that can improve warm-up efficiency and can prevent idling.

In order to achieve the above object, in the structure of the oil pan of the present invention, in the structure of the oil pan provided in the internal combustion engine and storing the lubricating oil, a mounting flange for mounting to the cylinder block and a return oil from the cylinder block are provided. A collecting tube that guides the gas into the oil pan, and an oil strainer that is arranged so that a part of the suction port overlaps with an outlet side end portion of the collecting tube that extends into the oil pan. In the outlet side end , a U-shaped notch is formed on the side where the mounting flange is provided .

  As described above, according to the structure of the oil pan of the present invention, the oil returned through the collection pipe flows out to the suction port of the oil strainer before spreading in the oil pan. This increases the rate at which hot oil returned from the cylinder block is directly sucked into the oil strainer, so that the oil circulating in the engine can be warmed up early and fuel consumption during warm-up can be improved. Become.

It is a perspective view which shows the structure of the oil pan which concerns on the 1st Embodiment of this invention. It is a top view of the structure of the oil pan of FIG. It is a sectional side view of the structure of the oil pan of FIG. It is a perspective view which shows the structure of the oil pan which concerns on the 2nd Embodiment of this invention. It is a top view of the structure of the oil pan of FIG. It is a sectional side view of the structure of the oil pan of FIG. It is a perspective view which shows the structure of the oil pan which concerns on the 3rd Embodiment of this invention. It is sectional drawing which showed the structure of the conventional oil pan. It is sectional drawing which showed the structure of the conventional different oil pan.

(First embodiment)
FIG. 1 shows a cross-sectional structure of the structure of the oil pan 6 according to the first embodiment of the present invention as viewed from the side. FIG. 2 is a plan view of the oil pan 6 of FIG. 1 viewed from the cylinder block side. The oil pan 6 is attached below a cylinder block (not shown). The return oil circulated in the engine flows down to the oil pan 6 through the oil return passage of the cylinder block.

  A collecting tube 8 is provided along the long side of the oil pan 6. A cutout 8b is formed on the upper surface side of the outlet side end 8a of the collection tube 8. Notches are also formed on the lower surface side, which will be described later with reference to FIG. The inlet of the collection pipe 8 is provided below the oil return passage outlet of the cylinder block. The return oil 2a that circulates in the engine and returns from the cylinder block is collected by such a collection pipe 8. The oil pan 6 is guided.

  The oil strainer 10 is for guiding the oil stored in the oil pan 6 to the oil pump provided in the engine, and one end is attached to the engine side so as to be connected to the suction port of the oil pump provided in the engine. It has been. For this reason, when the oil pan 6 is attached to the cylinder block, the oil strainer 10 is present in the crank chamber constituted by the cylinder block and the oil pan 6.

  In the structure of the oil pan 6 in the present embodiment, the suction port 10 a of the oil strainer 10 is arranged so as to partially overlap the outlet side end portion 8 a of the collection tube 8. By configuring in this way, most of the return oil 2a having a high temperature returned through the collection pipe 8 is directly sucked into the oil strainer 10 as the suction oil 2b. And a part flows out in oil pan 6 as diffusion oil 2c from crevices, such as notch 8b, and diffuses in oil 2 stored.

  Since it is configured in this way, during warm-up operation, the return oil 2a having a high temperature can be preferentially sucked into the oil strainer 10 as the suction oil 2b and circulate in the engine again. That is, since the temperature rise of the engine during warm-up is promoted, the warm-up operation can be completed early and unnecessary fuel consumption can be suppressed.

  FIG. 3 is a cross-sectional view of the oil pan 6 of FIG. 1 viewed from the long side. As shown in FIG. 3, the outlet side end 8a of the collection tube 8 has a notch 8b formed on the upper surface side and a notch 8c formed on the lower surface side.

  Accordingly, as described above, the return oil 2a is easily sucked into the oil strainer 10 as the suction oil 2b, and a part of the return oil 2a is transferred from the lower notch 8c to the oil pan 6. It can be mixed with the stored oil 2. That is, during normal running, not during warm-up, the oil 2 stored by vibration of the vehicle body is vigorously stirred, so that the oil enters and exits through the notches 8c and 8b formed on the lower side and the upper side. . For this reason, the suction oil 2b sucked up by the oil strainer 10 has its temperature relaxed by heat exchange with the stored oil 2, and is sucked up by the oil strainer 10 in a state where the temperature is lower than that of the return oil 2a. That is, it is possible to prevent the temperature of the circulating oil in the engine from being raised more than necessary during traveling.

  Further, as is apparent from FIG. 2, a U-shaped notch 8b is formed on the upper side of the outlet side end 8a, in other words, in the direction of the mounting flange of the oil pan 6 when viewed from the axial direction of the outlet side end 8a. 3, the oil strainer 10 can be disposed in the oil pan 6 from a direction substantially perpendicular to the bottom surface without interfering with the collecting tube 8 as indicated by a two-dot chain line in FIG. 3. it can. Accordingly, even when the oil strainer 10 is attached to the engine, when the collection pipe 8 is integrally set to the oil pan 6 and the cylinder block is assembled from the lower side, the oil pan The operation can be performed smoothly without being particularly conscious of the positions of the collection tube 8 and the oil strainer 10 in the interior 6.

As described above, the outlet side end 8a of the collection tube 8 and the suction port 10 of the oil strainer 10 are provided.
If it is arranged so that it overlaps with a, warm-up can be promoted and consumption of unnecessary fuel can be reduced, so that it is possible to contribute to improving fuel efficiency and also improve the efficiency of assembly work. It becomes possible.

  However, depending on the running state, the oil in the oil pan 6 may be significantly biased. Further, the amount of stored oil in the oil pan 6 may be reduced in relation to the outside air temperature. If these conditions are met, the oil around the suction port 10a of the oil strainer 10 is reduced and there is a risk that idle suction will occur.

  Therefore, in the present embodiment, a notch 8c is further formed on the lower surface side of the outlet side end portion 8a. Thereby, the lower surface side of the outlet side end portion 8a is opened to the bottom surface side of the oil pan 6, and the tip of the suction port 10a of the oil strainer 10 can directly touch the stored oil 2. Therefore, various conditions are added as described above, the amount of oil 2 stored in the oil pan 6 is reduced, and even if the oil level is lowered or uneven, the occurrence of idling is prevented. It becomes possible to prevent.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 4 is a perspective view showing the structure of the oil pan 26 in the present embodiment. FIG. 5 is a plan view of the oil pan 26 of FIG. 4 viewed from the cylinder block side. As shown in FIG. 4, in this embodiment, unlike the first embodiment, a part of the side wall of the oil pan 26 also serves as a part of the pipe line of the collecting pipe 28. A collecting tube 28 is integrally formed with respect to 26. As with the collecting tube 8 shown in FIG. 1, the collecting tube 28 is also formed with a U-shaped notch 28b on the upper surface side of the outlet side end portion 28a.

  Here, FIG. 6 shows a cross-sectional view of the oil pan 26 shown in FIG. As described above, since the U-shaped notch 28b is formed on the upper surface side of the outlet side end portion 28a of the collection tube 28, as shown in FIG. 3 in the first embodiment, When the collection tube 28 is integrally set to the oil pan 26, when assembled to the cylinder head, the outlet side end 28a of the collection tube 28 and the suction port 30a of the oil strainer 30 do not interfere with each other smoothly. Assembly can be performed.

  Further, since the collection pipe 28 in the present embodiment is formed so that a part of the side wall of the oil pan 26 also serves as the pipe wall, as shown in FIG. 6, the lower side of the outlet side end portion 28a. Is integrated with the bottom surface of the oil pan 26. However, the present invention is not limited to this configuration, and if a notch (not shown) is provided on the lower side of the outlet side end portion 28a so as to leave a gap with the bottom surface of the oil pan 26, the latter half of the first embodiment. As described above, it is possible to prevent empty suction.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.

  FIG. 7 mainly shows the periphery of the overlapping region 60 between the outlet side end portion 48 a of the collection tube 48 and the suction port 50 a of the oil strainer 50. In the first and second embodiments, the outlet side end portions 8a and 28a of the collection pipes 8 and 28 having a larger diameter than the suction ports 10a and 30a of the oil strainers 10 and 30 are connected to the suction ports 10a and 30a. The structure was shown to cover the outside. However, in the present embodiment, an example is shown in which the suction port 50a of the oil strainer 50 is configured to have a larger diameter than the outer diameter of the outlet side end portion 48a of the collection tube 48.

  In this configuration, if the notch 50b is formed on the lower surface side of the suction port 50a of the oil strainer 50, when the oil pan 46 integrated with the collection pipe 48 is assembled to the cylinder block, It is possible to prevent the outlet side end 48a of the collecting pipe 48 and the suction port 50a of the oil strainer 50 from interfering with each other, thereby improving the working efficiency.

  Moreover, since the front-end | tip of the suction inlet 50a is in the state which can always touch the oil stored by an oil pan, it is hard to generate | occur | produce idle suction. In addition, the fact that the effect of promoting warm-up is high is the same as in the above embodiments.

  In each of the above embodiments, the configuration in which the outlet side end portion of the collection tube and the suction port of the oil strainer are slightly overlapped with each other is shown as an example. However, the present invention is not limited to this, and any configuration may be used as long as at least a part of each flow path of the collection pipe and the oil strainer is three-dimensionally overlapped. Further, a configuration in which one side is deeply inserted into the other side may be used. Furthermore, it is not necessary for one to overlap so as to fit completely within the other inner region.

  According to the structure of the oil pan of the present invention, since the notch is formed at the downstream end of the collection tube, the entire oil in the oil pan is likely to cause stirring or thermal diffusion during running or when the engine is stopped. On the other hand, during warm-up when the engine is operating and the vehicle body is stationary, the oil temperature in the oil pan can be suppressed and circulated through the engine, which is particularly effective for idling stop vehicles.

2, 22, 42 Oil 2a, 22a, 42a Return oil 2b, 22b, 42b Suction oil 2c, 22c, 42c Diffusion oil 6, 26, 46 Oil pan 8, 28, 48 Collection pipe 8a, 28a, 48a Outlet side end Part 8b, 28b, 50b Notch 10, 30, 50 Oil strainer 10a, 30a, 50a Oil inlet

Claims (1)

In the structure of the oil pan that stores the oil circulating in the engine,
A mounting flange for mounting to the cylinder block;
A collecting pipe for collecting return oil from the cylinder block and guiding it into the oil pan;
An oil strainer disposed so as to partially overlap the suction port with respect to the outlet side end portion of the collection pipe extending into the oil pan,
A structure of an oil pan , wherein a U-shaped notch is formed on a side of the outlet side where the mounting flange is provided .

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