JPH0452458Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the structure of an oil pan for an internal combustion engine, and particularly to the structure of an oil pan that suppresses vibrations of a cylinder block.

[Conventional technology]

FIG. 6 shows an internal combustion engine with a V-type six-cylinder arrangement. Generally, in such an engine, due to an explosion in the combustion chamber, a component force Fs of the force F in the stroke direction of the piston 105 (which expands the oil pan in the left-right direction) is applied to the mounting flange 101a of the oil pan 101 to the cylinder block 103. This is one of the causes of vibration of the entire cylinder block 103.

For this reason, conventionally, the vibration of the cylinder block has been suppressed by using a structure as disclosed in Japanese Utility Model Publication No. 60-23489. That is,
As shown in FIGS. 7 to 9, the oil pan described in this publication has a partition wall member 107 that divides the inside of the oil pan into several parts in the direction of the cylinder row of the engine (in the left-right direction in FIGS. 7 and 8). In addition, a horizontal rib 109 is provided that intersects with the partition member 107 and continues to the inner wall of the oil pan.Furthermore, the upper end of the partition member 107 has a T-shaped cross section, while the lower end has a T-shaped cross section. An opening 111 is provided to communicate the front and rear parts of the partition wall member 107.

[Problem that the invention attempts to solve]

However, in the case of such a conventional oil pan, since the partition member 107 is provided from the top to the bottom of the oil pan, the weight increases significantly, and furthermore, the partition member 107 has an opening 111. However, since the opening 111 is small, there is a problem in that the so-called oil level slope characteristic, which refers to the flow of oil before and after the partition wall member 107 when the engine (oil pan) is tilted, is poor.

Another problem is that this conventional oil pan cannot be applied when the cylinder block has a half-skirt shape. This is the partition wall member 107
The upper end T-shaped formation interferes with either the counterweight of the crankshaft, the cap of the large end of the connecting rod, or the main bearing cap, and the horizontal rib 109
This is because it interferes with the crankshaft counterweight and the cap at the big end of the connecting rod.

This idea was created by focusing on these conventional problems, and it is an oil pan for internal combustion engines that maintains the vibration suppressing effect of the cylinder block, reduces weight increase, and improves oil level slope characteristics. The purpose is to provide.

[Means to solve the problem]

In order to achieve this purpose, this invention provides ribs on both the left and right outer walls of the oil pan that extend from the oil pan mounting flange to the bottom wall of the oil pan.
Both side walls of the oil pan where these ribs are provided,
It is configured to be connected by a connecting member that forms a substantially semicircular shape with the rib.

〔Example〕

Hereinafter, one embodiment of this invention will be described in detail based on FIGS. 1 to 5.

A mounting flange 1 for mounting on a cylinder block (not shown) is formed at the upper end of the oil pan, and ribs 3 are formed on both left and right side walls 2 of the oil pan that extend continuously from the mounting flange 1 toward the bottom wall 4 of the oil pan. ,3
a, 3b, 3c, 5, 5a, 5b, and 5c are provided, respectively. Of these, ribs 3a, 5a, and 5b on the front side of the engine (in the direction of arrow F in the figure) connect the upper surface of the left and right projecting portion 7 of a portion of the oil reservoir portion to the mounting flange 1.

As shown in FIG. 4, a connecting member 9 is provided between the inner walls of the upper surface of the left and right projecting portions 7, forming a substantially semicircular shape with the ribs 3a and 5a and located inside the oil pan bottom wall 4 side. It is being Furthermore, as shown in FIG. 5, there are ribs 3b, 5b between the inner walls of the oil pan where the ribs 3b, 5b are located at the approximate center of the oil pan.
A connecting member 11 is provided which forms a substantially semicircular shape with 5b and is located inside the oil pan bottom wall 4 side. These two connecting members 9, 11 are connected to the ribs 3, 5
The two side walls of the oil pan are connected to each other, and a large space 14 is formed between the connecting members 9 and 11 and the bottom wall 4 between the two side walls of the oil pan. . In addition, the connecting member 9,
11, as shown in FIG. 3, grooves 9a and 11a extending in the longitudinal direction are formed on the lower surface side, and the upper surface thereof is used for the rotation of the counterweight of the crankshaft, the cap of the large end of the connecting rod, and the rotation of the main bearing cap. It is installed in a position that does not interfere with the trajectory.

In addition, ribs 3c, 5c on the rear side of the engine are provided on the oil pan bottom wall 4 at the boundary 13 between the deep part (oil reservoir) on the front side of the engine and the shallow part on the rear side of the oil pan.
A connecting member 15 is provided which is continuous with each lower end portion of the connecting member 15 and forms a substantially semicircular shape with the ribs 3c and 5c. Similar to the connecting members 9 and 11, this connecting member 15 has a groove 15a formed therein, and is provided so as not to interfere with the rotation locus of the crankshaft counterweight or the like.

In addition, a plurality of ribs 19 parallel to the ribs 3 and 5 are provided on both side walls of the oil pan.

According to the oil pan having such a configuration, the connecting members 9, 11, 15 connect the both side walls 2 near the lower ends of the ribs 3, 5, so that it is different from the conventional oil pan in which a partition member is provided. weight is reduced compared to Furthermore, when the engine is tilted, the internal oil flows through the large space 14 between the connecting members 9, 11 and the bottom wall 4, and in the vicinity of the boundary 13 it flows over the connecting member 15 without any hindrance. The deterioration of the oil level slope characteristics due to the provision of the members 9, 11, and 15 is reduced.

Moreover, regarding the effect of suppressing the vibration of the cylinder block, which is the original function, since the ribs 3, 5 and the connecting members 9, 11, 15 are formed into a substantially semi-circular shape and are continuous to the mounting flange 1, the conventional technology The rigidity against the movement of the mounting flange 1 in the left and right direction during the explosion in the combustion chamber described above is stable and there is no problem.

In particular, the connecting member 9 provided near the protrusion 7 on the front side of the engine compensates for the decrease in rigidity in the left-right direction (in the left-right direction of the engine) of the side wall above the protrusion 7 due to the provision of the protrusion 7, and prevents vibrations of the side wall. It is also effective in reducing noise.

Furthermore, the connecting member 15 on the rear side of the engine alleviates stress generated at the boundary 13 between the deep and shallow parts due to the difference in rigidity between the deep and shallow parts of the oil pan.

[Effect of idea]

As described above, according to this invention, ribs are provided on both outer walls of the oil pan that extend from the mounting flange toward the oil pan bottom wall, and these two ribs connect the two side walls of the oil pan. Since the oil pan is reinforced with the connecting member, the weight increase due to reinforcement can be kept low while maintaining the cylinder block vibration suppression effect, and the oil level slope characteristics are also improved.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an oil pan according to an embodiment of this invention, Fig. 2 is a plan view of the oil pan of Fig. 1, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is a view of Fig. 3. Figure 5 is a cross-sectional view of Figure 3;
Fig. 6 is an explanatory diagram showing the force applied to the oil pan during engine operation, Figs. 7 to 9 relate to a conventional oil pan, Fig. 7 is a plan view, and Fig. 8 is the same as Fig. - sectional view, FIG. 9 is a - sectional view of FIG. 1...Oil pan mounting flange, 3, 3a, 3
b, 3c...rib, 5, 5a, 5b, 5c...rib, 9, 11, 15...connection member, 2...oil pan side wall, 4...oil pan bottom wall.

Claims (1)

[Scope of utility model registration request] Ribs are provided on both left and right outer walls of the oil pan that extend continuously from the oil pan mounting flange toward the bottom wall of the oil pan, and the ribs on both sides of the oil pan are connected to each other to form a substantially semicircular shape. An oil pan for an internal combustion engine characterized by being connected by members.