JPH09256830A - Oil sump structure for internal combustion engine for vehicles - Google Patents

Abstract

(57) Abstract: In an oil sump structure for an internal combustion engine for a vehicle, it is possible to sufficiently secure an oil supply to an oil strainer when the engine fluctuates while securing an arrangement space for an exhaust pipe. . SOLUTION: In an oil sump structure for an internal combustion engine for a vehicle, in which bottom surfaces 5, 6, 8 other than a recess 3 for accommodating an oil strainer are formed to be higher than a bottom surface 3a of the recess 3, a side surface of the recess 3 is spread. Fins 20 facing the recess 3 are formed on the high bottom surface 5. As a result, the oil on the bottom surface 5 is positively returned to the recess 3 at the time of engine fluctuation such as braking or acceleration. Further, by forming the eaves on the fins 20, the oil guide function of the fins can be more efficiently performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle internal combustion engine,
In particular, the present invention relates to an oil sump structure suitable for an internal combustion engine for motorcycles or four-wheeled vehicles.

[0002]

2. Description of the Related Art In recent years, a so-called collecting pipe structure has been widely adopted as an exhaust device for motorcycles, four-wheel vehicles, etc., and accordingly, it is bulky in a limited space below the engine. In order to pass the exhaust pipe of the collecting pipe structure,
Various shapes of oil reservoirs such as oil pans have been devised (Japanese Utility Model Publication No. 6-19795).

FIG. 9 shows an example of an oil pan that secures a space for disposing the exhaust pipe. The oil pan 1
Is a recess 3 for storing an oil strainer with an open top and a bottom
And a flat bottom surface 5 connected to the upper end of the recess 3 and formed in the right side region at substantially the same height as the upper end, and a slope shape that is formed before and after the recess 3 and gradually decreases toward the recess 3 side. The bottom surfaces 6 and 8 are formed integrally, and the slope-shaped bottom surfaces 6 and 8 are connected to the high planar bottom surface 5 via the small step portions 7 and 9 at the right end portion, respectively.

By forming the flat bottom surface 5 at a high position as described above, a space for arranging four square type exhaust pipes 17 is secured below the flat bottom surface 5 as shown in FIG. .

[0005]

In order to smoothly suck the oil by the oil strainer arranged in the concave portion 3, particularly in order to smoothly suck the oil when the internal combustion engine fluctuates, the inside of the concave portion 3 is increased. It is necessary to secure a sufficient amount of oil in order to make the recess 3 deep and to quickly return the oil returning from each part of the engine to the flat bottom surface 5 to the recess 3 when the engine changes. Need to

However, since the flat bottom surface 5 is formed to be shallow and wide, the oil simply moves back and forth on the flat bottom surface 5 when it fluctuates, for example, when braking, accelerating, or traveling on a slope, and the concave portion is quickly formed. Do not return to 3. Therefore, in an extreme situation, an oil shortage may occur in the concave portion 3, and it may not be possible to smoothly supply sufficient oil to each lubrication point. Moreover, air trapping may occur.

Further, low ribs extending in the front-rear direction are formed on the planar bottom surface 5 of FIG. 9 to prevent the movement of oil toward the recess 3 side.

[0008]

When the engine fluctuates, for example, when braking, accelerating or traveling on a slope, the oil flow caused by the above fluctuation is used to positively guide the oil on the flat bottom surface to the recess for accommodating the strainer to circulate the oil. The purpose is to improve performance.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is provided with an upward-opening concave portion for accommodating an oil strainer, and the bottom surface other than the concave portion is formed higher than the bottom surface of the concave portion. In the oil sump structure of the internal combustion engine for a vehicle, a fin facing the recess is formed on a high bottom surface that spreads laterally of the recess.

According to a second aspect of the present invention, in the oil sump structure for an internal combustion engine for a vehicle according to the first aspect, as fins,
A plurality of fins including fins that are inclined so as to come to the rear as viewed from above toward the concave portion are provided.

According to a third aspect of the invention, in the oil reservoir structure for an internal combustion engine for a vehicle according to the first aspect, the fins are
A plurality of fins including fins that are inclined so as to come to the front as it goes to the concave side when viewed from above are provided.

According to a fourth aspect of the present invention, in the oil sump of the vehicle internal combustion engine according to the first, second or third aspect, the eaves are provided at the upper ends of the fins.

[0013]

1 to 4 show an oil pan 1 provided at the lower end of an internal combustion engine for a motorcycle as an oil reservoir.
This is an example in which the present invention is applied to. In FIG. 1 showing a plan view, an oil pan 1 is formed in a generally rectangular shape as a whole when viewed from above, and an upper open bottomed cylindrical shape protruding downward is provided in a front-rear center portion of a left side portion. The strainer storage recess 3 is formed, and the shape of the recess 3 viewed from above is
The right side of the circle is cut off partially. The region R1 on the right side of the recess 3 is formed with a bottom surface 5 having a generally horizontal plane over the entire length in the front-rear direction, and the bottom surface 5 is located at a height corresponding to the upper end of the recess 3. Both are connected to the upper end of the recess 3.

An arcuate front bank 10 having a constant width in the left-right direction and having substantially the same height as that of the planar bottom surface 5 is formed on the front side of the upper end of the recess 3, and the central bank of the front bank 10 is formed. Is a rib 14 that extends forward to reach the front end wall of the oil pan 1.
A circular rib 11 having a split 11a is formed in the middle of the rib 14.

In FIG. 2, the bottom surface 6 on the front side of the concave portion 3 is a gentle slope having a rearward downward shape (for example, 5 to 10 °), and the bottom surface 8 on the rear side of the concave portion 3 is a steep slope having a forward downward shape (for example, 30). Is about 50 °). Each of the inclined bottom surfaces 6 and 8 is lower than the planar bottom surface 5 and is connected to the planar bottom surface 5 via step portions 7 and 9, respectively.

A curved groove 13 having a narrow left-right width and extending rearward is formed at the rear end of the concave portion 3, and the curved groove 13 is formed.
Is smoothly connected to the bottom surface 3a of the recess.

A rear bank 12 having substantially the same height as the planar bottom surface 5 is formed on both left and right sides of the rear end of the curved groove 13.

In FIG. 4, a space S is secured below the planar bottom surface 5, and a square type array of 4 is provided in the space S.
A collection pipe type exhaust pipe 17 is arranged and passes from the vehicle front side to the rear side.

In FIG. 1, the planar bottom surface 5 has a plurality of linear fins 2 extending toward the concave side, which is an essential part of the present invention.
0, 2, 2, ..., 7 are formed, and the two fins 20-1 and 20-2 arranged in front of the front end edge P1 of the recess 3 are from above so as to function during acceleration. The fins 20-3 are inclined so as to come to the rear side as they go to the left side as viewed, and the fins 20-3 slightly behind the front edge P1 are formed parallel to the left-right direction, and the four fins 20 arranged after the front edge P1 are arranged. -4,5,6,7 are
It leans toward the front as it goes to the left to function when braking.

A rib 21 extending from the left front end to the rear right is formed on the front bottom surface 6.

On the bottom surface 3a of the recess 3, three pedestals 18 for mounting a strainer are formed, and an oil strainer 19 is placed on the pedestal 18 as shown in FIG. The strainer 19 has a suction port at the lower end, and an oil communication pipe 27 leading to an oil pump (not shown) is connected to the upper end.

The operation will be described. An oil pump (not shown) sucks the oil in the concave portion 3 through the oil strainer 19 and supplies the oil to the lubrication points such as the crankshaft and the transmission. The used oil is returned to the oil pan. By the way, the oil supplied to the mission system falls behind the strainer part, and the oil mainly supplied to the crankshaft etc. falls below the strainer part.

When braking or traveling downhill, the oil in the recess 3 may be an inclined oil surface as shown by the phantom line L1 in FIG. Since it flows relatively to the front, it abuts on the rear surface of the rear fins 20-4,5, 6, 7 and is guided leftward and positively returns into the recess 3. In addition, part of the oil hitting the rear surface of the fin 20-3 extending parallel to the left-right direction also positively returns to the inside of the recess 3.

Inside the recess 3, the front side wall 10 prevents the oil from escaping forward, and the oil positively returned from the flat bottom surface 20 as described above is sufficient to suck the oil strainer 19. Quantity is maintained.

When accelerating or traveling uphill, the oil on the flat bottom surface 5 flows backward with respect to the oil pan, so that the oil abutting on the front surfaces of the two front fins 20-1, 2 is the fin 20-1. , 20-2, and returns to the inside of the recess 3.

[0026]

[Second Embodiment] In FIG. 5, an eaves 25 is provided at the upper end of the fin 20 to reduce the amount of oil that runs over the fin 20 and increase the amount of oil that can be guided to the recess 3. . Each eave 25 has a plurality of openings 25a.
Is integrally formed by a single plate having the above. The plate is sandwiched between the oil pan 1 and a case member such as a crank case coupled thereto. The rear fins 20-4,5,6,7 are provided with eaves 25 projecting rearward, and the front fins 20-1,2 have eaves 25 projecting forward, although not shown. to be able to do,
Further, the fins 20-3, which are parallel to the middle left-right direction, are provided with the openings 25a so that the eaves 25 projecting forward and backward can be formed.

When such an eaves 25 is formed, for example, when the oil flows forward during braking and collides with the rear fin 20-7 or the like, the fin 20-7 tends to get over the front. Oil can be blocked and guided to the recess 3. In FIG. 6, when the eaves 25 is not provided, the oil level L2 is the limit, but the eaves 25 can dam the oil up to the amount indicated by L3 and return it to the recess 3.

[0028]

[Third Embodiment] FIG. 7 shows a modified example of the fin arrangement pattern, in which five fins 30-1, 2,
3,4,5 are formed. The two fins 30-1 and 30-2 arranged in front of the front end edge P1 of the recess 3 are inclined so as to come to the rear side toward the left side so as to function at the time of acceleration, etc. The fin 30-3 slightly rearward is formed parallel to the left-right direction, and the rear two fins 30-
4 and 5 are inclined so as to move to the left as they move to the left so that they will function when braking.

That is, this is an example in which the oil guide function during braking or traveling downhill and the oil guide function for traveling during acceleration or traveling uphill are evenly provided.

[0030]

[Fourth Embodiment] FIG. 8 shows a fin arrangement that emphasizes oil circulation during acceleration and when traveling uphill. The front fins 40-1, 2, 3 are inclined so that the left side is rearward. , The number of 4 is increased. That is, the front four fins 40-1,
2, 3 and 4 are inclined so as to come to the rear as it goes to the concave side when viewed from above, and the two fins on the rear side are fins 40-5, 6
Is inclined so as to come to the front as it goes to the concave side when viewed from above.

[0031]

[Other Embodiments]

(1) Instead of using an oil pan as the oil reservoir, it is of course possible to apply the present invention to the lower end chamber of the crankcase in which oil is stored.

(2) It is also possible to form the fin of the flat bottom surface 5 into a curved shape when viewed from above.

(3) The bottom surface on which the fins are provided has a horizontal surface in any of the above-mentioned embodiments, but in view of the exhaust pipe arranged on the lower side, it is formed in an inclined shape so that the concave side is lowered if possible. It is also possible, and in this case the oil is guided more smoothly into the recess.

[0034]

【The invention's effect】

(1) As described above, according to the present invention, since the fins 20 facing the recess 3 are formed on the high bottom surface 5 formed on the side of the oil strainer housing recess 3, the collective exhaust pipe is formed. A space for disposing the exhaust pipe, which becomes bulky, is secured in the lower side of the engine, and at the same time, when the oil flows forward or backward, such as during braking or acceleration, the fins 20 positively act on the bottom surface 5.
The upper oil can be returned to the inside of the recessed portion 3, the suction performance of the oil strainer can always be kept good, and air trapping and the like can be prevented.

As fins, if ribs 20-1, 2, 3, 4 which are inclined so as to come to the rear as it goes to the recess side are provided,
When accelerating or going uphill, the oil flowing backward is positively guided to the recess 3 by the ribs 20-1, 2, 3 and 4. On the other hand, if the rib is provided so as to incline so as to come to the front as it goes to the recess side, the oil flowing forward is positively guided to the recess 3 by the rib at the time of deceleration or downhill.

(3) Since the fins 20 are formed on the bottom surface 5, they also serve as ribs, and the strength of the oil sump constituent member such as an oil pan can be increased. Moreover, it suppresses the vibration of the oil pan and the like, and is also useful for a soundproof effect.

[Brief description of drawings]

FIG. 1 is a plan view of an oil pan alone to which the inventions according to claims 1 to 3 of the present application are applied.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a partial plan view of an oil pan to which the invention according to claim 4 is applied.

FIG. 6 is a schematic view taken along the line VI-VI in FIG.

FIG. 7 is an exploded perspective view showing another embodiment of a single oil pan to which the inventions according to claims 1 to 3 of the present application are applied.

FIG. 8 is a plan view showing another embodiment of a single oil pan to which the inventions according to claims 1 to 3 of the present application are applied.

FIG. 9 is a perspective view of a conventional example.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

[Explanation of symbols]

 1 Oil pan (an example of oil reservoir) 3 Recessed portion 5 High bottom surface 20, 30, 40 Fin 25 Eaves

Claims (4)

[Claims] 1. An oil sump structure for an internal combustion engine for a vehicle, comprising: an upper opening-shaped recess for accommodating an oil strainer, and a bottom surface other than the recess formed higher than a bottom surface of the recess. An oil sump structure for an internal combustion engine for a vehicle, characterized in that fins facing the recess are formed on the high bottom surface. 2. The oil sump structure for an internal combustion engine for a vehicle according to claim 1, wherein the fin includes a fin that is inclined so as to come to the rear as it goes to the recess side when viewed from above. 3. The oil sump structure for an internal combustion engine for a vehicle according to claim 1, wherein the fin includes a fin inclined so as to come to the front as it goes to the recess side when viewed from above. 4. The oil sump structure for an internal combustion engine for a vehicle according to claim 1, wherein an eave is provided at an upper end of the fin.