JPH11270408A - Oil pan structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pan structure which can improve the vibratory characteristics. SOLUTION: An oil strainer 22 is positioned over the middle between adjoining beads 23a and 23b, wherein the strainer height (h) is smaller than the bead height H. On the oil strainer 22, the beads 23a and 23b are arranged so that the bead height H is not restricted by the strainer height (h). Because the bead height H contributes large to enhancement of the rigidity, the rigidity of the oil pan body 21 can be enhanced by securing the bead height H sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan structure for lubricating oil of an internal combustion engine.

[0002]

2. Description of the Related Art A conventional oil pan of an internal combustion engine is used.
6) The body is shown in FIGS. In each case, (a)
FIG. 2B is a plan view of the oil pan main body, and FIG. 2B is a schematic cross-sectional view of FIG.
The oil strainers 62 and 72 (oil-strainer) are immersed in the oil in order to suck up the lubricating oil (not shown) in the 71. In the oil pan main body 61 shown in FIG.
No. 4 has no unevenness and is flat. In an oil pan main body 71 shown in FIG. 7, a plurality of beads 73a to 73c (bead) are provided on a bottom surface 74 thereof. The beads 73 a to 73 c are set to a height that does not interfere with the oil strainer 72.

[0003]

SUMMARY OF THE INVENTION Oil strainer 6
It is preferable to install the devices 2 and 72 at a position as low as possible so as to surely suck the lubricating oil without sucking the air. On the other hand, as the height of the beads 73a to 73c increases, the rigidity of the oil pan main body 71 increases and the vibration reduction effect increases. However, in order to prevent interference with the oil strainer 72, the beads 73a to 73c are set at arbitrary heights. However, there is a certain limitation in improving the rigidity, and there is a limit in improving the vibration characteristics. The present invention has been made in view of such circumstances, and has as its object to provide an oil pan structure capable of further improving vibration characteristics.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is provided with an oil pan main body which is disposed below an internal combustion engine and stores oil for lubricating the internal combustion engine. In an oil pan structure in which a plurality of beads are provided on the bottom surface, the height of the beads provided on a portion other than the bottom portion corresponding to the oil strainer as a suction port for sucking oil supplied to the internal combustion engine is set at the lower end position of the oil strainer. Set higher than.

Further, in an oil pan structure provided with a plurality of beads on a bottom surface of an oil pan main body which is disposed below the internal combustion engine and stores oil for lubricating the internal combustion engine,
The height of the bead provided on the bottom surface corresponding to the oil strainer as a suction port for sucking oil supplied to the internal combustion engine may be set lower than the lower end position of the oil strainer. That is, among the beads on the bottom surface, at the bottom portion corresponding to the oil strainer, the height of the top of the bead is lowered to be lower than the position of the suction port of the oil strainer. As described above, the required bead height can be secured by appropriately changing the height of the top of the bead according to the planar positional relationship with the oil strainer.

[0006]

Next, an embodiment of an oil pan structure according to the present invention will be described with reference to the drawings. FIG.
2 is a perspective view showing a state in which an oil pan main body 11 is attached to a lower portion of a cylinder block 10 of an engine (internal combustion engine). The oil pan main body 11 stores oil for lubrication, and also serves to lower the oil temperature by releasing heat to the outside air. The figure shows the cylinder block 1
Although 0 is shown as being vertical, it is actually mounted on the vehicle body such that the bottom surface 14 of the oil pan body 11 is substantially horizontal. 2 to 4 show the oil pan main bodies 21, 31, 41 according to the present invention. In each case, (a)
1 is a plan view of an oil pan main body, and (b) and (c) are cross-sectional views of (a) schematically shown. In order to suck up the lubricating oil (not shown) in the oil pan bodies 21, 31, 41, the oil strainers 22, 32, 42
It is immersed in oil away from 34 and 44. The basic shapes of the oil pan main bodies 21, 31, 41 are the same as the conventional ones.

FIG. 2 shows a first embodiment. The oil strainer 22 is located above the middle between the adjacent beads 23a and 23b, and the strainer height h (the distance from the oil pan bottom surface 24 to the oil strainer lower end 22a) is, as shown in FIG. , Bead height H
(Distance from oil pan bottom 24 to bead top 25)
Than lower. That is, the oil strainer lower end 22a
Is smaller than the distance between the beads 23a and 23b, and the oil strainer 22 is connected to the lower end 2 thereof.
2a is arranged to be lower than the bead top 25 (when the interval between the beads 23a and 23b is a reference). Also, the beads 23a and 23b are arranged on the oil strainer 22 so that the bead height H is not limited to the strainer height h (when the shape and size of the oil strainer lower end 22a is a reference). Since the bead height H greatly contributes to the improvement of the rigidity, the rigidity of the oil pan main body 21 can be improved by securing the bead height H sufficiently. In FIG. 2, the beads 23a and 23b are arranged so that their longitudinal directions are parallel to each other. In addition, the beads are arranged in a lattice shape at intervals larger than the shape and dimension of the oil strainer lower end 22a. It is also possible not to provide a bead on the bottom surface corresponding to the oil strainer 22. Further, the bead height H may be the same as the strainer height h.

FIG. 3 shows a second embodiment. The oil strainer 32 is located between the bead 33a and the next bead 33c, and there is one bead 33b below the bead 33a. This bead 33b is lower in height than the other beads 33a and 33c. Bead 33a, 3
The height H of 3c is higher than the strainer height h, and the height H 'of the bead 33b is lower than the strainer height h. That is, the shape and dimensions of the oil strainer lower end 32a are made larger than the spacing between the beads 33a, 33b, and 33c, and the bead height H 'is made smaller than the bead height H so that the bead heights are different. An oil pan main body 31 is formed. In other words, only the height of the bead 33b located below the oil strainer 32 is set to a height H ′ that does not interfere with the oil strainer 32, and the other beads 33
a, the height H of 33c is sufficiently secured. Thus, by lowering the bead height H ′, the lower end of the oil strainer 3
2a can be arranged low, and the beads 33a, 3a, 3b, and 3c do not cause a problem of interference with the oil strainer 32.
By sufficiently securing the bead height H of 3c, the rigidity of the oil pan main body 31 can be improved. Note that the bead height H may be the same as the strainer height h.

FIG. 4 shows a third embodiment.
(B) is a sectional view taken along line IVb-IVb of (a), (c)
4A is a sectional view taken along line IVc-IVc in FIG. The beads 43 a to 43 f are provided in a substantially lattice shape orthogonal to each other, and two beads 4 are provided below the oil strainer 42.
3d and 43e are provided. Beads 43a to 43f are:
The base height H is sufficiently ensured, and the two beads 43b and 43c are provided with concave portions 46 whose heights are partially reduced. The oil strainer 42 is disposed in the concave portion 46. The bead height H is higher than the strainer height h, and the height H ′ of the recess 46 is lower than the strainer height h. That is, the oil strainer lower end 42
The shape and the size of the oil pan main body 41 are set to be larger than the interval between the beads 43, and the height H ′ of the concave portion 46 is made lower than the basic height H of the beads 43 so that the beads have different heights. Is formed. In other words, Bead 4
3, the base height H is sufficiently ensured, and only the portion (recess 46) corresponding to the lower side of the oil strainer 42 is set to the height H 'which does not interfere. Thus, the basic height H of the bead 43
Is set to a value necessary and sufficient for improving the rigidity, and by providing the concave portion 46 as a minimum necessary range for disposing the oil strainer lower end 42a low, the rigidity can be effectively improved. The basic height H of the bead 43
May be the same as the strainer height h.

The oil in the oil pan body is pumped up from an inlet of an oil strainer by an oil pump (not shown), filtered by an oil filter (not shown), and then forcibly sent to an engine (not shown). (Pressure feeding type or pressure splash type).

In general, the natural frequency f is represented by K as rigidity,
If the mass is M,

(Equation 1) And the natural frequency f increases as the rigidity K increases. For example, in an in-line four-cylinder engine, the second-order excitation force is the largest, and the natural frequency
Above the next frequency, the vibration becomes extremely small.
The smaller the vibration, the lower the radiated sound. FIG. 5 shows a state in which the radiated sound is reduced. In FIG. 5, the horizontal axis (X axis) is the engine speed (rpm) and the vertical axis (Y axis) is the radiated sound (dB). The dashed line Vb is the case of the present embodiment in the case of the solid line Va. As is clear from the figure, the vibration characteristics can be improved.

[0012] As the bead is raised, the wall around the oil strainer is raised as a result, and the role of the partition plate can be enhanced. Therefore, the bead has an effect of retaining the oil level against sudden turning, sudden braking, inclination of a hill, etc. while the vehicle is traveling, and can prevent the inhalation of air from the oil strainer. In terms of securing, a margin can be provided. Also, by increasing the bead, the heat radiation area increases, and the heat radiation effect improves. Further, the interval between beads and the number thereof can be appropriately changed.

[0013]

According to the present invention, since the top of the bead around the oil strainer is the same as or higher than the lower end of the oil strainer, the height of the bead can be increased. The rigidity of the bottom surface of the oil pan is increased, and vibration can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which an oil pan main body is attached to a lower portion of a cylinder block of an engine (internal combustion engine).

FIGS. 2A and 2B are drawings showing an oil pan main body according to the first embodiment of the present invention, wherein FIG. 2A is a plan view of the oil pan main body, and FIG. FIG.

3A and 3B are drawings showing an oil pan main body according to a second embodiment of the present invention, wherein FIG. 3A is a plan view of the oil pan main body, and FIG. FIG.

FIGS. 4A and 4B are drawings showing an oil pan main body according to a third embodiment of the present invention, wherein FIG. 4A is a plan view of the oil pan main body, and FIG. FIG.

FIG. 5 is a graph showing a state in which the radiated sound is reduced. The horizontal axis represents the engine speed (rpm), and the vertical axis (Y axis) represents the radiated sound (d).
B).

FIG. 6 is a drawing showing an oil pan main body of a conventional internal combustion engine, in which (a) is a plan view of the oil pan main body, and (b).
1 is a schematic cross-sectional view of FIG.

7A and 7B are diagrams showing an oil pan main body of a conventional internal combustion engine, wherein FIG. 7A is a plan view of the oil pan main body, and FIG.
1 is a schematic cross-sectional view of FIG.

[Explanation of symbols]

11, 21, 31, 41 Oil pan main body 22, 32, 42 Oil strainer 22a, 32a, 42a Oil strainer lower end 23a to 23b, 33a to 33c, 43a to 43f Bead 14, 24 Oil pan bottom 25 Bead top 46 Concave H bead Height, basic height H 'Bead height h Strainer height

Claims (2)

[Claims] 1. An oil pan structure provided at a lower side of an internal combustion engine and provided with a plurality of beads on a bottom surface of an oil pan main body for storing oil for lubricating the internal combustion engine, wherein oil supplied to the internal combustion engine is provided. An oil pan structure, wherein a height of the bead provided at a portion other than a bottom portion corresponding to an oil strainer as a suction inlet is set higher than a lower end position of the oil strainer. 2. An oil pan structure which is provided below an internal combustion engine and has a plurality of beads on a bottom surface of an oil pan main body for storing oil for lubricating the internal combustion engine. An oil pan structure, wherein a height of the bead provided on a bottom surface corresponding to an oil strainer as a suction inlet is set lower than a lower end position of the oil strainer.