KR20000044022A - Cylinder block and bed plate for reducing noise - Google Patents

Abstract

PURPOSE: A cylinder block and a bed plate are provided to reduce vibration and noises by improving a supporting structure of a crank shaft. CONSTITUTION: A vibration switching groove(60) for making vibration heat-exchange possible is made up between bearing cell units(42,52) and skirt parts(44,54) for supporting a crank shaft(30). The vibration switching groove(60) prevents the vibration of the bearing cell units from being transferred to the skirt parts. Slant ribs(43,43) are made up connected to a side face of a cylinder block(40) and a bed plate(50) in a contacting part of the bearing cell units. Accordingly, when the inner force of the ribs is increased, the vibration generated as the up and down movement of a piston is converted to a rotational movement is decreased.

Description

Cylinder block and bed plate for noise reduction

The present invention relates to a cylinder block and a bed plate of an engine, and more particularly to a cylinder block and a bed plate for noise reduction to improve the structure of the support portion of the crankshaft to reduce vibration and noise.

Conventionally, as shown in FIG. 1, in the structure of the cylinder block 40 and the bed plate 50 of the engine 20, the bearing cell parts 42 and 52 and the skirt parts 44 and 54 are directly connected.

As a result, the vibration of the crankshaft 30 is directly transmitted to the outer side of the cylinder block, and the vibration of the skirt portion 44 of the cylinder block 40 is generated by the vibration, and the oil mounted on the bottom surface of the bed plate 50. Vibration is transmitted directly to the oil pan (not shown), which is the main cause of noise.

Therefore, it is required to reduce the noise caused by the vibration of the oil pan by improving the vibration transmission structure of the skirt, which is the main cause of the noise, to prevent the vibration transmitted to the oil pan through the skirt.

The present invention was made in view of the above circumstances, and an object thereof is to provide a cylinder block and a bed plate for noise reduction to improve the structure of the support portion of the crankshaft to reduce vibration and noise.

Specific means of the present invention for achieving the above object,

In the cylinder block 40 and the bed plate 50 for supporting the crankshaft 30 of the engine 20,

Inclined ribs formed at the upper and lower tangential directions of the bearing cell parts 42 and 52 to connect the bearing cell parts 42 and 52 and the skirt parts 44 and 54 of the cylinder block 40 and the bed plate 50. It characterized in that the vibration isolation groove 60 for vibration isolation including (43,53).

According to the above means, the vibration caused by the up and down movement in the crankshaft is blocked by the vibration insulating groove is not transmitted to the skirt portion, it is possible to reduce the noise.

In addition, the rigidity of the rib can be increased to suppress generation of vibration.

1 is a cross-sectional view of a conventional cylinder block and bed plate assembly.

2 is an assembled cross-sectional view of the cylinder block and the bed plate according to the embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

20: engine 30: crankshaft

40: cylinder block 43,53: rib

50: bed plate 60: vibration insulation groove

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

2 is a cross-sectional view of an assembly of a cylinder block 40 and a bare plate 50 mounted thereto according to an embodiment of the present invention, and the same or equivalent parts as those of FIG.

As shown in the present invention, the vibration insulating groove 60 is formed between the bearing cell parts 42 and 52 and the skirt parts 44 and 54, which are the parts supporting the crank shaft 30. It features.

The vibration isolation groove 60 prevents the vibration of the bearing cell parts 42 and 52 from which the largest vibration is transmitted when the crank shaft 30 is driven to rotate to the skirt parts 44 and 54 which are the side parts. do.

The principle of vibration isolation of the vibration insulation groove 60 acts as a principle such as digging a groove such as a groove between the construction site and the surrounding buildings at the construction site.

On the other hand, the present invention is composed of inclined ribs ribs 43, 53 connected to the side of the cylinder block 40 and the bed plate 50 at the tangential portions of the bearing cell portions 42, 52.

That is, since the ribs 43 and 53 are inclined so as to lie in the rotational tangential direction of the crankshaft 30, the ribs 43 and 53 are excellent in durability for suppressing the generation of vibration as compared to the conventional horizontal ribs.

This may be one of the methods of reducing vibration by allowing the load in the vertical direction due to the vertical movement of the piston in the explosion compression stroke of the engine 20 to withstand more effectively.

That is, when the strength of the ribs 43 and 53 is increased, the vibration (vibration) generated by converting the vertical movement of the piston into the rotational movement is reduced.

As described above, the present invention suppresses the vibrations generated through the inclined ribs 43 and 53 which receive vibrations generated from the crank shaft 30 which are converted into rotational motions by receiving the vertical motions from the pistons, and in particular, the vibration insulating grooves. By maximizing the insulation of the vibration through the (60) to minimize the vibration (vibration) of the skirt portion (44, 45) can significantly reduce the vibration noise of the oil pan (not shown) mounted on the bottom of the bed plate 50 have.

As described above, according to the present invention, the vibration due to the rotational movement occurring in the crankshaft is blocked by the vibration insulating groove and is not transmitted to the skirt portion, thereby reducing noise.

In addition, the rigidity of the rib can be increased to suppress generation of vibration.

Claims (1)

In the cylinder block 40 and the bed plate 50 for supporting the crankshaft 30 of the engine 20, Inclined ribs formed at the upper and lower tangential directions of the bearing cell parts 42 and 52 to connect the bearing cell parts 42 and 52 and the skirt parts 44 and 54 of the cylinder block 40 and the bed plate 50. Cylinder block and bed plate for noise reduction, characterized in that the vibration isolation groove 60 for vibration isolation including (43,53).