JPH0110424Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a water jacket between a plurality of cylinder parts arranged in a row and the outer wall of the block located outside thereof, and a tightening bolt for fastening and fixing the cylinder head to the cylinder block. The present invention relates to a cylinder block for a multi-cylinder engine in which boss portions are formed at upper positions on both sides of the block facing each other across a portion between adjacent cylinders, and at upper positions at both ends in the cylinder arrangement direction.

FIG. 1 shows a four-cylinder motor vehicle engine Z having a cylinder block of this type. In this engine Z, a cylinder head 2 is fastened and fixed to the top surface of a top deck 10 of a cylinder block 1 by tightening bolts 5, 5, . The transmission case 4 is attached to the top.

In such multi-cylinder engines, it has been widely known that the cylinder block 1 is thermally deformed due to combustion heat, and in fact, various design measures have been taken to prevent this thermal deformation of the cylinder block 1. Measures have been taken and have had great effects.

However, in such a cylinder block, in addition to thermal deformation, tightening deformation occurs in the cylinder block 1 by tightening the cylinder head 2 with the tightening bolts 5, 5, etc., but this is not yet widely known. Therefore, countermeasures are still insufficient.

The present inventor thoroughly investigated the state of deformation when taking measures against deformation due to tightening of the cylinder block, and created a second version of one of the deformed examples obtained as a result of the investigation in an exaggerated state compared to the actual state. Figure and 3rd
Shown in the figure. From this modification, by tightening and fixing the cylinder head 2 to the upper surface side of the top deck 10 of the cylinder block 1 with the tightening bolts 5, 5, etc., the cylinder head 2 is fixed in the vertical plane as shown by the chain line in FIG. It can be seen that the center portion of the cylinder block 1 is curved downward as indicated by 1', and at the same time, the top deck 10 located on the compression side of the cylinder block 1 is deformed into a wave shape as indicated by 10'. As a result, on the upper surface side of the cylinder block 1, the deformation is greatest at both ends in the longitudinal direction (that is, in the cylinder arrangement direction). In addition, in the horizontal plane, as shown in FIG. 3, each cylinder 6, 6... is crushed in the longitudinal direction of the cylinder block 1 as indicated by the symbols 6', 6'... due to the warpage of the cylinder block 1, and is shaped into an ellipse. It is transformed into. Such deformation tends to be particularly noticeable when the cylinder block 1 is made of aluminum alloy.

One of the reasons why such tightening deformation occurs in the cylinder block 1 is thought to be the lack of rigidity of the cylinder block itself, but this tightening deformation in the cylinder block 1 may be due to uneven wear of the cylinder 6 or gas due to seal failure. It is necessary to suppress this tightening deformation as much as possible since it causes problems such as leakage that directly cause deterioration of engine performance.

In view of the conventional engine cylinder block as described above, the present invention aims to more effectively suppress the tightening deformation of the cylinder block by increasing the rigidity of the cylinder block in accordance with the tightening deformation characteristics of the cylinder block. The object of the present invention is to provide an engine cylinder block that can prevent gas leakage due to uneven cylinder wear and seal failure, and which has the basic configuration as shown in the header. In the block, in the vertical direction, the cylinder block is installed at a portion corresponding to each tightening bolt boss part of the cylinder block, spanning the upper wall part and the lower wall part that connect the cylinder part and the outer wall of the block at their upper and lower ends, respectively. A plurality of reinforcements are provided at positions between the vertical ribs of the block wall, the ends of which are alternately connected to the upper and lower ends of a pair of adjacent vertical ribs, and which extend in the cylinder arrangement direction. Ribs are provided respectively, and the ends of the reinforcing ribs located on the outside in the cylinder arrangement direction of the reinforcing ribs located at both ends in the cylinder arrangement direction are connected to the upper ends of the vertical ribs located at both ends in the cylinder arrangement direction. It is characterized by:

Hereinafter, the cylinder block of the engine of the present invention will be explained using the cylinder block (made of aluminum alloy) of a four-cylinder automobile engine shown in FIGS. 4 to 6 as an example. As shown in FIG. 5, the outer sides of four cylinders 6, 6... arranged in a row at predetermined intervals are surrounded by a block outer wall 18, and the upper ends 6a, 6a... of each cylinder 6, 6... and the block outer wall 1 are surrounded by a block outer wall 18.
The upper end 18a of each cylinder 6,6...
(corresponds to the lower wall within the scope of the utility model registration request)
A water jacket 7 is formed between each cylinder 6, 6, . . . and the outer wall 18 of the block. This water jacket 7 is connected to a passage 8, a water jacket (not shown) in the cylinder head 2 which is fastened and fixed on the top deck 10.
8... are communicated with each other.

Tightening bolts 5, 5 for tightening the cylinder head...
As shown in FIGS. 4 and 6, each cylinder 6,
6... (i.e., the upper positions on both sides of the blocks facing each other across the portion between adjacent cylinders, and the upper positions at both ends in the cylinder arrangement direction), for a total of 10 pieces. These tightening bolts 5, 5... are
Top decks 10 are respectively placed on the inner wall surfaces 18c and 18d of the block outer wall 18 on the water jacket side.
The large diameter portions 16a, 16a, . . . on the top deck 10 side of the vertical ribs 16, 16, .
(corresponding to the boss portion for the tightening bolt in the scope of the utility model registration claim) are screwed into screw holes 13, 13, . . .

Furthermore, the above-mentioned vertical ribs 16, 16, .
In addition to the respective vertical ribs 16, 16... at mutually interpositional positions,
The reinforcing ribs 15, 15, which constitute the main body of the present invention, are integrally formed in a raised manner. This reinforcing rib 15,1
5 is for improving the rigidity of the cylinder block 1, and as shown in FIG. The cylinder block 1 is connected to the joint part of the upper end of the rib 16 and the joint part of the bottom deck 11 and the lower end of the vertical rib 16 in a "W" shape.
It is formed so as to extend continuously in the longitudinal direction. The reinforcing ribs 15, 15, .
The upper end portions 6 and 16 are oriented in such a direction as to be joined to the joint portion between the upper end portions and the upper deck 10.

When the vertical ribs 16, 16... and the reinforcing ribs 15, 15... are formed integrally with the block outer wall 18 in this way, when the cylinder block 1 is viewed as a whole, the top deck 10, the bottom deck 11, and the vertical ribs 16 , 16... and the reinforcing ribs 15, 15... form a kind of lattice structure, and the bending rigidity of the cylinder block 1 is increased. At the same time, the cylinder block 1 is the one that undergoes the largest bending deformation due to the tightening of the tightening bolts 5, 5...
At both ends of the reinforcing rib 15 is a vertical rib 16.
The reinforcing rib 15 is connected to the joint between the bottom deck 11 and the lower end of the vertical rib 16, that is, the part that becomes the boss for the tightening bolt. Compared to the case where they are joined, this will be even higher. As a result, the cylinder block 1 has greater resistance to bending deformation due to tightening of the tightening bolts 5, 5, . . . .

Note that the reinforcing ribs 15, 15, . You can also. Further, although the illustrated embodiment has been described with respect to a cylinder block made of aluminum alloy, the present invention can of course be applied to cylinder blocks made of other materials (eg, cast iron).

Next, to explain the effect of the present invention, the cylinder block of the engine of the present invention has reinforcing ribs formed on the outer wall surface of the cylinder block that act to increase the rigidity of the cylinder block and also correspond to the deformation characteristics of the cylinder block. Therefore, it is possible to more efficiently reduce the tightening deformation of the cylinder block that occurs when the cylinder head is tightened and fixed to the cylinder block, and prevent uneven cylinder wear or sealing caused by tightening deformation of the cylinder block. This has the practical effect of being able to prevent gas leaks due to defects.

[Brief explanation of the drawing]

1 to 3 are explanatory views of the deformed state of the cylinder block, FIG. 4 is a plan view of the cylinder block according to the embodiment of the present invention, and FIG. 5 is the same as that shown in FIG. 4.
The vertical sectional view, FIG. 6, is a view taken along the - arrow in FIG. 1... Cylinder block, 2... Cylinder head, 5... Tightening bolt, 6... Cylinder, 7...
Water jacket, 15...Reinforcement rib, 16...
...Vertical ribs.

Claims (1)

[Scope of utility model registration request] A water jacket is provided between the plurality of cylinder parts arranged in a row and the outer wall of the block located outside thereof, while a boss part for a tightening bolt that fastens and fixes the cylinder head to the cylinder block is connected to the part between the adjacent cylinders. In a cylinder block of a multi-cylinder engine formed at upper positions on both sides of blocks facing each other and at upper positions at both ends in the cylinder arrangement direction, the cylinder parts and Vertical ribs are provided that extend in the vertical direction across the upper and lower walls that connect the outer walls of the block at their upper and lower ends, respectively. A plurality of reinforcing ribs are provided, each of which is alternately connected to the upper end and lower end of a pair of vertical ribs that are adjacent to each other and extend in the cylinder arrangement direction, and among the reinforcing ribs, the reinforcing ribs are located at both ends in the cylinder arrangement direction. A cylinder block for an engine, characterized in that an end portion located on the outside in the cylinder arrangement direction is connected to an upper end portion of the vertical rib located at both ends in the cylinder arrangement direction.