JPS6349529Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a new oil pan structure for an internal combustion engine. This invention relates to an oil pan structure that expands its capacity by extending it toward the timing gear housing.

[Technical background of the invention and its problems]

As shown in FIG. 1, at the bottom of the internal combustion engine 1, there are
An oil pan 3 is provided to cover the lower part of the cylinder body 2 so as to collect and store lubricating oil that is circulated inside the engine and discharged. Further, on the outer surface 8 of the cylinder body 2, where the front end side 4 of the cylinder body 2, that is, the shaft end 7 on the opposite side to the output end 6 of the crankshaft 5 extends outside, A gear housing 9 is attached to support or surround a gear train system (not shown) such as a timing gear to be connected. This gear housing 9 mainly includes a front plate member 10 serving as a side plate for supporting the gear train system,
It is comprised of a gear case member 11 that is arranged in line with and joined to the gear case member 11 and covers the gear train system.

By the way, conventionally, when the gear housing 9 is made of cast iron, the front end 12 of the oil pan 3
was joined to the lower part of the front end surface 4 of the cylinder body 2 to maintain the lubricating oil sealability. this is,
This is because if the gear housing 9 is made of cast iron, post-processing is required on its lower end surface in order to provide it with sealing properties.

In particular, when the oil pan 3 and the cylinder body 2 are joined at the center of the crankshaft 5, it becomes necessary to form the sealing surface around the crankshaft of the front end 12 in an arch shape, and in order to ensure the sealing performance. The condition is that the starting end of the arch part be processed and formed as a corner part. However, if the gear housing 9 is made of cast iron, it is extremely difficult to perform post-processing to form the starting end of the arched portion into a corner portion. Therefore, in effect,
It is impossible to extend the front end portion 12 of the oil pan 2 further forward than the front end surface 4 of the cylinder body 2,
The sealing of the arch portion had to be ensured by inserting a seal packing 14 between the bearing cap 13 and the bearing cap 13 attached to the lower part of the partition wall forming the front end surface 4 of the cylinder body 2.

However, according to the above structure, the front end 12 of the oil pan 3 is connected to the front end surface 4 of the cylinder body 2.
Under conditions where the depth of the oil pan 3 is restricted, there has been a problem that the capacity is insufficient.

Incidentally, as a related technique, an ``Engine Oil Pan Fixing Device'' (Japanese Utility Model Application No. 54-91538) has been proposed.

[Purpose of invention]

The present invention was created in view of the above-mentioned problems and to effectively solve them.

The purpose of this invention is to divide one of the components of the gear housing attached to the front end surface of the cylinder body into two pieces, and by ensuring sealing performance, the front end position of the oil pan can be adjusted. An object of the present invention is to provide an oil pan structure in which the oil pan can be extended from the front end face of a cylinder body and joined thereto, thereby increasing the oil pan capacity.

[Example of idea]

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 2, 21 is an oil pan provided to cover the lower part of the cylinder body 2, and 22 is composed of a front plate 23 serving as a side plate and a gear case 24, and is arranged in parallel on the front end surface 4 of the cylinder body 2. This is the gear housing.

As shown in the figure, the front end 25 of the oil pan 21 extends forward from the front end surface 4 of the cylinder body 2 and below the gear housing 22, and is joined to the internal combustion engine 25 including the gear case 22.
and is configured to recover lubricating oil from. In the illustrated example, the front end 2 of the oil pan 21 is
The extending end 26 of 5 extends along the lower end surface 27 of the front plate 23 that constitutes the gear housing 22.
They are joined via a seal member 40.

As shown in FIGS. 3 and 4, the front plate 23 is divided into a main plate 28 above the center of the crankshaft 5 and an underplate 29 below this. The main plate 28 mainly supports timing gears 30 and 31.
and a gear chain (not shown) that is applied to these timing gears 30, 31 or a tensioner (not shown) that applies a constant tension to this gear chain.
It is provided to support the gear train system consisting of etc. The lower end surface 32 is formed as a sealing surface to which the oil pan 21 is to be joined. Further, the under plate 29 is fixed to the lower end surface 32 of the main plate 28 by screws 33 and is suspended from the lower end surface 32 of the main plate 28.
The inner peripheral side 34 is provided along the lower side of the timing gear 30 mounted on the shaft end 7 of the crankshaft 5. That is, it is formed in an arch shape so as to surround the shaft end 7 of the crankshaft 5. A sealing surface 36 is formed along the outer peripheral side 35 of the under plate 29 to which the oil pan 21 is joined. Furthermore, this seal surface 3
As shown in FIG. 5, both ends of the main plate 6 intersect with the lower end surface 32 of the main plate 28 in a straight line, and the starting end 37 of the arched portion is formed as a corner. In other words, the front plate 23 is divided into the main plate 28 and the under plate 29 so as to ensure sealing with the extending end 25 of the oil pan 21.

As shown in FIG. 3, a gear case 24 covering the above-mentioned gear train system is joined to the front plate 28 to form a gear housing 22. Back side 38 of under plate 29
is communicated with the inside of the oil pan 21, and an oil groove 39 and the like are formed so that the lubricating oil circulated inside the gear housing 22 including the inside of the gear case 24 is collected into the oil pan 21. ing.

As is clear from the above description, the present invention provides an internal combustion engine 1 in which a gear housing 22 made of cast iron is used.
Even in such a case, the oil pan 21 can be extended forward from the cylinder block 2, and its front end 25 can be joined to the gear housing 22 while ensuring sealing performance. It is designed to expand the oil pan capacity.

Incidentally, as shown in FIG. 6, the gear case 24 side may of course be formed into a main plate 41 and an under plate 42, similar to the above-mentioned front plate, and the oil pan 21 may be joined to these. be. When configured in this way, it is possible to deploy it below the crankshaft 5 of the gear train system, that is, in the oil pan 21.
As a result, the degree of freedom in designing the internal combustion engine 1 can be increased, and the balance shaft and oil pump drive system (not shown) for reducing engine vibration can be placed inside the oil pan 21. The mechanism can also be simplified.

[Effect of idea]

In summary, the present invention provides the following excellent effects.

(1) Even if the gear housing of the gear train system mounted on the front end face of the cylinder body is made of cast iron, it is possible to ensure sealing performance.

(2) Since the cast iron gear housing can be provided with sealing properties, the oil pan can be extended forward from the front end surface of the cylinder body to increase its capacity, and can be joined to the gear housing.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing the structure of an oil pan of an internal combustion engine equipped with a conventional cast iron gear housing; Fig. 2 is a schematic side sectional view showing the structure of an oil pan according to a preferred embodiment of the present invention; Fig. 3; is an enlarged view of the main part of Fig. 2, Fig. 4 is a view taken along the - line in Fig. 3, Fig. 5 is an enlarged view of part A of Fig. 4, and Fig. 6 is a side showing the main part of a modified embodiment. FIG. In the figure, 2 is the cylinder body, 3 and 21 are the oil pan, 5 is the crankshaft, 28 and 41 are the main plates that are the upper parts of the side plates of the gear housing, and 29 and 4
2 is an under plate which is the lower part of the side plate of the gear housing.

Claims (1)

[Scope of utility model registration request] The side plate of the gear housing arranged in parallel on the front end side of the cylinder body is divided into an upper part and a lower part surrounding the shaft end of the crankshaft in an arch shape at the axial center position of the crankshaft, and the oil is provided in the cylinder body. An oil pan structure characterized in that the front end side of the pan extends below the side plates and is joined along the lower end surfaces of the upper and lower parts of the side plates.