JPS6318738Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the buttful plate structure within the crankcase of an internal combustion engine.

An oil pan is provided at the bottom of the crankcase of an internal combustion engine, and a buttful plate is installed horizontally within the oil pan.As the buttful plate is generally provided with a strainer mounting hole or an oil return hole, The oil in the crank chamber falls directly onto the oil surface through the hole, causing air bubbles to form and get mixed into the oil. Furthermore, when the oil level is high, the oil level is agitated by the rotation of the crankshaft, promoting the inclusion of air bubbles, and furthermore, the oil temperature may rise.
It is undesirable for air bubbles to be mixed into the oil or for the oil temperature to rise in this way in terms of maintaining proper oil pressure and lubricity.

This invention was developed to solve the above problems, and its purpose is to prevent oil from falling directly onto the oil surface in the oil pan, causing air bubbles to be mixed into the oil, and preventing crankshaft rotation. This prevents the oil from affecting the oil level, improves the defoaming and cooling effect of the oil that returns to the oil pan, and also ensures easy installation of the oil strainer. In the crankcase of an internal combustion engine, it is possible to reduce the output loss of the internal combustion engine by preventing the rocking of the crankshaft and reducing the resistance caused by mist-formed oil to the rotating members of the crankshaft. This is to provide a full plate structure in the area. In order to achieve such an objective, the present invention provides an internal combustion engine in which a crankshaft is supported from below by a bearing cap within a crankcase. A full plate is provided integrally with the oil pan near the oil level of the oil stored in the oil pan, and a second buttful plate is provided above the first buttful plate and located above the first buttfull plate. The gist is that the strainer is fixed to a bearing cap in the vicinity of a rotating member such as a crankshaft so as to cover the strainer mounting hole provided in the buff-full plate and to overlap almost the entire surface of the first buff-full plate. .

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

FIG. 1 is a longitudinal sectional front view of the main parts of the engine, and FIG. 2 is a longitudinal sectional side view thereof.

As shown in the figure, a crankshaft 1 is supported by a cylinder block 2 and a bearing cap 3 connected thereto from below, and an oil pan 5 is attached below the crankcase 4. The bearing cap 3 is made up of four pieces 31 hanging apart in the axial direction of the crankshaft 1, and an oil passage 33 is formed through a connecting part 32 that connects the lower center part of each of the four pieces 31. The shaft journal is supplied with oil, and the bearing cap 3 is connected to the cylinder block 2 by four bolts 6 inserted into each of the four pieces 31 from below.

On the other hand, the oil pan 5 surrounds the bearing cap 3 from below and is longer than this in the direction of one axis of the crankshaft, and has an oil reservoir 51 bulging downward in its right half as shown in FIG. Be prepared. The first butt-full plate 7 is fixed inside the oil pan 5 and is integrated and installed horizontally, thereby partitioning the inside of the oil pan 5 into upper and lower parts. This buffer plate 7 is provided with a strainer mounting hole 71 in the upper part of the oil reservoir portion 51.
The strainer 9 is inserted into the oil reservoir 51 from above. Here, the mounting hole 71 is the bearing cap 3.
In Figure 2, the opening is in the lower right half.

Then, a second buffle plate 8 is fixed to the lower surface of the bearing cap 3. This buttful plate 8 is formed to have approximately the same width as the bearing cap 3 and approximately the same length in the axial direction of the crankshaft.
A recess 81 surrounding the connecting portion 32 at the center of the lower part of the bearing cap 3 is formed at the center in the width direction, extending over the entire length in the longitudinal direction, and sloped portions 82 and 83 are formed on both sides of the recess 81. , and the front and rear edges of the recess 81 are bent downward.
4.85. The buff-full plate 8 is connected to each of the four pieces 31 of the bearing cap 3 at its inclined portions 82, 83 by tightening them together with two long bolts 61, 61, located near the center.

In this way, a second buttful plate 8 is provided above the first buffle plate 7 in the oil pan 5 and is fixed to the bearing cap 3, and the second buffle plate 8 connects the first butthole. It is configured to cover the strainer mounting hole 71 provided in the plate 7 from above. Therefore, both double full plates 7,
8 forms a labyrinth shape for the strainer mounting hole 71.

Note that the recess 81 of the second full plate 8 and the first
The vertical space with respect to the buff-full plate 7 is small as shown in the figure.

Next, the two upper and lower vertical plates 7, 8
Describe the effect of

Oil splashes scattered inside the crankcase 4 due to the rotation of the crankshaft 1 are removed from the oil reservoir 5.
The strainer mounting hole 71 that opens above the second
Because it is covered by the full plate 8,
It does not fall directly into the strainer mounting hole 71, but adheres to the upper second buffle plate 8, the periphery of the first buffle plate 7 below it, and the stepped portion 52 of the oil pan 5.

The oil adhering to the second buttful plate 8 is collected in the recess 81 along the inclined parts 82 and 83, and is then collected on the first buttful plate 7 below from the bent parts 84 and 85 at the front and back of the recess 81. and dripped onto the stepped portion 52 of the oil pan 5 (see Fig. 2).
The oil on the buff-full plate 7 drips from the strainer mounting hole 71 to the oil reservoir 51, and the oil on the stepped portion 52 drips into the protrusion 72 of the buff-full plate 7.
It flows into the oil reservoir 51 from between... and .

In this way, the upper and lower two vertical plates 7 and 8
Because the labyrinth shape is formed, oil droplets with air bubbles mixed in the oil are degassed through the long labyrinth, and at the same time, the cooling effect is enhanced by passing through the long labyrinth. The defoamed and cooled oil is collected in the oil reservoir 51.

In addition, since the second buff-full plate 8 is disposed above the strainer mounting hole 71, it is possible to prevent the rotation of the crankshaft 1 from directly acting on the oil level in the oil reservoir 51, thereby preventing air from flowing. can be promoted and oil temperature rise can be prevented.

Furthermore, since the second buff-full plate 8 is attached to the bearing cap 3, the oil strainer 9 can be easily installed.

Also, the first buttful plate 7 is connected to the oil reservoir portion 5.
1, it is possible to prevent the oil level of the oil reservoir 51 from swinging when the internal combustion engine is tilted or when vibrations are applied to the internal combustion engine.

Furthermore, since the second baffle plate 8 is disposed near the rotating member such as the crankshaft 1, the mist-formed oil can be removed from the vicinity of the rotating member such as the crankshaft 1, and the oil becomes mist-formed. This oil reduces the resistance generated in rotating members such as the crankshaft 1, thereby reducing the output loss of the internal combustion engine.

As is clear from the above description, according to the present invention, the first buttful plate is provided near the oil level of the oil stored in the oil pan, and the second butthole plate is provided above the first buttful plate. It is provided near a rotating member such as the crankshaft so as to overlap the first buttful plate over almost the entire surface, and forms a labyrinth shape for the strainer mounting hole above the oil pan, so that the oil in the crankcase is It prevents the oil stored in the oil pan from dripping directly onto the oil surface, preventing air bubbles from entering the oil, and also improves the bubbles and cooling effect of the oil that returns to the oil pan. Therefore, the lubricity of the internal combustion engine can be improved.

In addition, it is possible to prevent the oil level of the oil stored in the oil pan from fluctuating, and it also reduces the resistance generated by mist-formed oil on rotating members such as the crankshaft, which improves the performance of the internal combustion engine. Output loss can be reduced.

Note that an oil drop hole may be formed in the recessed portion of the second buffle plate, and in this case, the oil drop hole is not provided above the strainer mounting hole.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of essential parts of an internal combustion engine according to the present invention, and FIG. 2 is a longitudinal sectional side view thereof. In the drawing, 1 is the crankshaft, 3 is the bearing cap, 4 is the crankcase, 5 is the oil pan, 51 is the oil reservoir, 7 is the first buttful plate, 71 is the strainer mounting hole, and 8 is the second
81 is the concave portion of the buffful plate.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine in which a crankshaft is supported from below by a bearing cap within a crankcase, a first butty-full plate that partitions an oil pan provided at the bottom of the crankcase into upper and lower parts is connected to the oil stored in the oil pan. A second buttful plate is provided integrally with the oil pan near the oil level, and a second buttful plate is provided above the first buttful plate and a strainer mounting hole provided in the first buttfull plate is provided integrally with the oil pan. A baffle in a crankcase of an internal combustion engine, characterized in that it is fixed to the bearing cap in the vicinity of a rotating member such as the crankshaft so as to cover and overlap substantially the entire surface of the first buffful plate. plate structure.