JPH0540244Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an oil pan device for a multi-cylinder engine having a power train structure in which engine power is output from a portion between cylinders of a crankshaft.

<Prior art> There is a conventional lubrication system for multi-cylinder engines as shown in Figure 8 (July 20, 1980, published by Sankaido Co., Ltd., "Automotive Engineering Complete Book, Volume 4 Gasoline Engine", pp. 308-309. (see page).

Explaining the path of lubricating oil based on this diagram:
First, lubricating oil is sucked up from an oil pan 3 by an oil pump 2 that is coaxially driven by the crankshaft 1, and is sent under pressure to the main gear rally 5 through an oil filter 4. Lubricate all parts.
Also, the cylinder block 8 passes through the main gear rally 5.
The oil pressure-fed from the oil passage to the cylinder head 9 is transferred to the oil passage 11 in the cylinder head 9.
and is sent to the bearing of the camshaft 12. The sent lubricating oil then circulates to each rocker shaft 13 and lubricates each part of the rocker arm 14, distributor, and valve blocker. After lubrication, the lubricating oil returns from inside the rocker cover 15 to the oil pan 3 via the oil return passages of the cylinder head 9 and cylinder lock 8.

The oil pan 3 in such a multi-cylinder engine lubrication system stores lubricating oil, and also serves to dissipate heat to the outside air and lower the oil temperature. The oil pan 3 must have a capacity sufficient to contain a sufficient amount of oil to circulate through the lubrication system.

<Problems to be solved by the invention> By the way, in the multi-cylinder engine as mentioned above,
Although the entire lower surface of the engine body can be used as a mounting part for the oil pan 3, this is not possible with the following engines.

That is, it has a powertrain structure in which the engine power output from the part between the cylinders of the crankshaft is transmitted to the clutch part, the transmission part, and the differential gear part. There are conventional engines in which the gear section is recessed. In this engine,
If the distance from the differential gear section to the wheels is not the same, the steering will be moved by the torque reaction force, so as mentioned above, the differential gear section should be placed approximately in the center of the engine axis. Therefore, when an oil pan of a normal shape as shown in FIG. 8 is provided on the lower surface of the engine body, there is a problem that the amount of lubricating oil is insufficient.
Also, if oil pans are installed on both sides of the bottom of the engine body, the amount of lubricating oil collected in the left and right oil pans will be unbalanced, so it is necessary to install oil strainers for both oil pans. The problem is that it increases structural complexity.

Therefore, in view of the conventional situation, the present invention provides an oil pan device that prevents the amount of lubricating oil accumulated in the left and right oil pans from becoming unbalanced when the oil pans are provided on both sides of the lower surface of the engine body. The purpose is to

<Means for solving the problem> For this reason, the present invention transfers the engine power output from the part between the cylinders of the crankshaft to the clutch part,
In a multi-cylinder engine that has a powertrain structure in which power is transmitted to a transmission section and a differential gear section, and the differential gear section is placed under the engine body, the oil pan is connected to the engine body. The differential gear portion on the lower surface is divided into two parts and installed on both sides of the oil pan, and a communication path is provided to communicate a portion of both oil pans with each other.

<Function> In this configuration, the oil pan is divided into two parts on both sides of the differential gear, which solves the problem of insufficient lubricating oil. By making the pans communicate with each other, the amount of lubricating oil accumulated in the left and right oil pans is balanced.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 7.

First, the powertrain structure of the engine targeted by the present invention will be explained based on FIGS. 1 to 3. The engine power output from the center of the crankshaft 17 of the in-line six-cylinder engine 16 is as follows. The transmission is transmitted to a clutch 21 via a gear 18 provided at the center of the crankshaft 17, a reduction gear 19 that meshes with the gear 18, and a gear 20 that meshes with the reduction gear 19.
2 and the countershaft 23 to the differential gear 24.

Here, the differential gear portion 25 is disposed at a lower portion of the main body of the engine 16 and at a substantially central position in the axial direction of the engine 16 so as to be inserted thereinto.

A differential case 26 of the differential gear portion 25 is joined to a crankcase 16a of the engine 16 main body.

The oil pan 27 is located on both sides of the lower surface of the engine 16 body, that is, on the lower surface of the crankcase 16a, with the differential case 26 in between.
It is divided into two parts like 7a and 27b and installed. Also, both oil pans 27
A communication path 28 that communicates parts of a and 27b with each other.
(See Figure 4).

In this embodiment, both oil pans 27a, 27
b, the oil pans 27a and 27b, and the communication passage 28 are integrally formed. and,
This communication passage 28 portion is connected to the differential case 26 and the crank case 16 of the engine 16 main body.
On the outer surface of the joint with a, the crankshaft 1
It is adapted to be inserted into a recess 29 having a substantially triangular cross section extending in seven directions.

Incidentally, the crankcase 16a in this embodiment
The mounting surface of the oil pan 27 is shown in FIG.

In such embodiments, both oil pans 27
a, 27b and both oil pans 27a, 27b
Although the communication passage 28 and the oil pans 37a and 3 are integrally formed, as in the embodiment shown in FIG.
7b may be formed separately, and both may be connected by a pipe 38 serving as a communication path. In this case as well, the pipe 38 is positioned in the recess 29.

The oil pan mounting surface of the crankcase 16a in this embodiment is as shown in FIG.

According to this configuration, since the oil pan is divided into two parts and arranged on both sides with the differential gear 24 in between, the lubricating oil capacity is more sufficient than when the oil pan is arranged only on one side. This eliminates the problem of insufficient lubricating oil.
In addition, by communicating the oil pans with each other using the communication passage 28 and pipe 38 that are integrated with the oil pans, the amount of lubricating oil accumulated in the left and right oil pans is balanced, and it is possible to correspond to both oil pans as before. There is no need to provide an oil strainer for each, and the structure can be simplified.

According to the embodiment shown in FIG. 6, since the two oil pans 37a and 37b are independent parts, the oil pan mounting surface of the crankcase 16a has a closed shape on both the left and right sides, as shown in FIG. This is advantageous in terms of the rigidity of the crankcase 16a.

<Effects of the invention> As explained above, according to the invention, the oil pan is divided into two parts and arranged on both sides with the differential gear section in between, and parts of both oil pans are connected to each other. By communicating with the oil pans, sufficient lubricating oil capacity can be secured, which solves the problem of insufficient lubricating oil, and the amount of lubricating oil accumulated in the left and right oil pans is balanced, making it possible to maintain sufficient lubricating oil capacity. This has a great practical effect of simplifying the structure, such as eliminating the need to provide oil strainers for both oil pans.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of an engine oil pan device according to the present invention, in which A is a front view, B is a right side view, C is a left side view, and FIG.
A sectional view, FIG. 3 is a schematic diagram showing the power train structure of the engine of the above embodiment, FIG. 4 is a perspective view of the oil pan in the above embodiment, and FIG. 5 is a plan view showing the oil pan mounting surface of the above embodiment. , FIG. 6 is a side view showing another embodiment, FIG. 7 is a plan view showing the oil pan mounting surface in the same embodiment, and FIG. 8 is a perspective view showing a conventional engine lubricating device. 16... Engine, 16a... Crank case, 17... Crankshaft, 21... Clutch, 22... Main shaft, 23... Countershaft, 24... Differential gear, 2
5... Differential gear section, 26... Differential case, 27, 27a, 27b,
37a, 37b...Oil pan, 28...Communication path, 38...Pipe.

Claims (1)

[Scope of utility model registration request] It has a powertrain structure that transmits engine power output from the part between the cylinders of the crankshaft to the clutch part, transmission part, and differential gear part, and the differential gear part is located at the bottom of the engine body. In a multi-cylinder engine in which the oil pan is placed under the engine body, the oil pan is divided into two parts on both sides of the engine body with the differential gear section in between. An oil pan device for a multi-cylinder engine characterized by providing a communicating path.