JPH01110860A - Cylinder block construction of v-type engine - Google Patents

Abstract

PURPOSE:To reduce the generation of noise due to engine oscillations with improved rigidity of a cylinder block by engaging recessed parts of a reinforcing member with projections of a bank, and reinforcing a part between a pair of banks by means of the reinforcing member firmly fixed thereto. CONSTITUTION:A plate 6 reinforces a part between banks 2, 3 to improve rigidity of a cylinder block 1. A fixing area such as welded area between the plate 6 and the cylinder block 1 is increased by engaging recessed parts 63, 64 formed on the plate 6 with block side ribs 4, 5 formed on the cylinder block 1, compared to the base of simple fixing of plates. The block side ribs 4, 5 regulate the movement of the plate 6 to firmly fix it to the cylinder block 1 so that the reinforcing effect is increased and the rigidity of the cylinder block 1 is much more improved. The noise generation due to engine oscillations can be reduced accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to the structure of a cylinder block that constitutes a type engine.

(Prior Art) As shown in, for example, Japanese Utility Model Application Publication No. 60-61458, a cylinder block for a V-type engine having a pair of banks arranged in a substantially square shape is already known.

Cylinder blocks for V-type engines, such as those mentioned above, have traditionally been made of cast iron using general casting methods such as molding, but recently, in order to reduce weight, they have been made of aluminum alloy and have been made with complex shapes. These products are now being formed by die-casting, which is suitable for manufacturing products.

By the way, the structure of the cylinder block of the ■type engine is
By connecting both banks with a wall called a top wall that spans the space between the two banks to create an integrated structure, torsional rigidity, horizontal bending rigidity, and vertical bending rigidity are improved. It is known that it is possible to reduce noise caused by engine vibration.

However, in the structure having a top wall as described above, the space between the pair of banks is covered with the top wall and becomes a hollow part, so according to the casting method such as the molding method, it is difficult to use a core. However, it could not be formed using the die-casting method, which uses a mold. Therefore, when using the die-casting method, it is necessary to create a structure that does not have a top wall.As a result, the cylinder block formed by the die-casting method has poor rigidity and generates a lot of noise due to engine vibration. .

(Object of the Invention) In view of the above circumstances, the present invention provides a cylinder block for a ■type engine formed by a die-casting method.
An object of the present invention is to provide a cylinder block structure for a V-type engine that can improve torsional rigidity, horizontal bending rigidity, and vertical bending rigidity, and can reduce noise generation due to engine vibration.

(Structure of the Invention) The present invention provides a cylinder block for a type engine having a pair of banks arranged in a substantially V shape and formed by a die-casting method, in which a convex portion is provided on each of the opposing surfaces of the pair of banks. A reinforcing member having a concave portion and covering a space between the pair of banks is fixed to the cylinder block so that the concave portion fits into the convex portion. Its gist is the engine cylinder block structure.

According to the above configuration, by fitting the concave portion of the reinforcing member and the convex portion of the bank, the space between the pair of banks is reinforced by the reinforcing member firmly fixed to the pair of banks.
Even if the cylinder block of a V-type engine is formed by die-casting without having a wall called a top wall, its rigidity can be increased and noise generation due to engine vibration can be reduced.

(Embodiment) FIGS. 1 to 3 show an embodiment of a cylinder block structure for a V-type engine according to the present invention. In these figures, reference numeral 1 denotes a cylinder block, which is made of aluminum alloy by die-casting and includes a pair of banks 2.3 arranged in a substantially V shape. On each opposing surface 21.31 of the pair of banks 2.3,
A block side rib (projection) 4.5 is formed to protrude.

The block side ribs 4 formed on one bank 2 side and the block side ribs 5 formed on the other bank 3 side are arranged in a state slightly shifted from facing each other.

A plate (reinforcing member) 6 serving as a top wall straddles between the pair of banks 2.3 so as to cover a space 7 between both banks 2.3. Recesses 63.64 are formed on both sides of the plate 6, recessed from each side surface 61.62 toward the opposite side. These four parts 63 and 64 are arranged in a state slightly shifted from the state in which the recesses 63 and 64 face each other, similar to the block side ribs 4 and 5, and the block side ribs 4.
5 is fitted. The block-side rib 4.5 fitted with the fourth part 63.64 has the concave portion 63.64 forming part of the plate 6 passed through from the top surface to the bottom surface, so its upper end can be confirmed from above the cylinder block. It becomes. As shown in FIG. 4, a reinforcing rib 65 is protruded from the back surface of the plate 6 and extends across the plate so that a part of the plate 6 extends over the recesses 63 and 64. 6. Particularly, the space between the recess 63 and the recess 64 is reinforced, and the rigidity against twisting and bending is increased.

The plate 6 configured as described above is fixed to the cylinder block 1 by beam welding between the plate 6 and the parts such as the bank 2.3 that are in contact with the plate 6. As a result, the outer circumferential surfaces 61 and 62 degrees of the plate 6 as well as the inner surfaces of the recesses 63 and 64 and the block side ribs 4 degrees 5 are also welded. In this way, the cylinder block 1 has a pair of banks 2
．． A top wall W is formed so as to cover the space 7 between the two banks 2.3.

As described above, the cylinder block structure of this ■-type engine is such that the plate 6 serving as the top wall is fixed between the banks 2 and 3 of the cylinder block 1, which is formed without a top wall by die-casting. It becomes. Therefore, the bank 2,
The rigidity of the cylinder block 1 is increased by reinforcing the space between the cylinder block 1 and the cylinder block 1.

Furthermore, by fitting the recesses 63 and 64 formed in the plate 6 with the block side ribs 4 and 5 formed in the cylinder block 1, the welding area between the plate 6 and the cylinder block 1 can be reduced. The fixed area increases compared to the case where a flat plate is simply fixed, and the movement of the plate 6 is regulated by the block side ribs 4.5, so that the plate 6 is firmly fixed to the cylinder block 1. Therefore, the reinforcing effect is enhanced and the cylinder block 1 becomes even more rigid.

It should be noted that it is considered that the block side ribs 4.5 are not formed on the banks 2 and 3 but on the plate 6, and the plate 6 is fixed to the cylinder block 1, so that the final shape is the same as that of the above embodiment. However, in this case, not only the effect of fitting the concave portion and the convex portion described above cannot be obtained, but also, especially when fixing the plate 6 by beam welding, the beam welding is performed at a depth of 5 rMR or more from the top surface. Since the bonding strength is not guaranteed, the ribs formed on the plate and the cylinder block cannot be bonded sufficiently, and the rigidity of the cylinder block becomes poor, which is not preferable.

(Effects of the Invention) As explained above, in the cylinder block structure of the V-type engine according to the present invention, the space between the pair of banks is reinforced by the reinforcing member, and furthermore, the cylinder block structure of the V-type engine according to the present invention is reinforced between the pair of banks by the reinforcing member, and furthermore, by the fitting of the concave part and the convex part, both banks are reinforced. The strength of the bond between the bank and the reinforcing member is increased, increasing the rigidity of the cylinder block. For this reason, even if the cylinder block of a V-type engine is formed by die-casting without a wall called a top wall, by making the cylinder block of the ■-type engine have the structure of the present invention, the torsional rigidity and It is possible to improve the horizontal bending rigidity and the vertical bending rigidity, and it is possible to reduce the generation of noise caused by engine photography.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the cylinder block structure of a ■-type engine according to the present invention, and Fig. 2 is a -
(2) A sectional view, FIG. 3 is an exploded perspective view showing the embodiment in a simplified manner, and FIG. 4 is a perspective view showing the reinforcing member as seen from the back side. DESCRIPTION OF SYMBOLS 1... Cylinder block, 2.3... Bank, 4°5... Convex part, 6... Reinforcement member, 7... Space part, 2
1.31... Opposing surface of bank, 63.64... Concave portion.

Claims (1)

[Claims] 1. In a cylinder block for a V-type engine formed by die-casting and having a pair of banks arranged in a substantially V-shape, a convex part is formed on each of the opposing surfaces of the pair of banks, and a concave part is formed. A cylinder block structure for a V-type engine, characterized in that a reinforcing member covering a space between the pair of banks is fixed to the cylinder block so that a recess thereof fits into the protrusion.