JPH082450Y2 - Cylinder block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention improves the cylinder liner and the cylinder block by improving the shape of the water jacket provided in the cylinder block. Related to the cylinder block.

(Prior Art) FIG. 1 is a sectional view of a cylinder block. As is clear from this figure, the cylinder block has a space 3 for inserting a cylinder liner 2 into a cylinder block body 1.
Has a cylinder liner 2 inserted in this space 3
The cooling water 5 is made to flow through the water jacket 4 formed between the outer wall 21 and the space wall 31 of the cylinder block body 1. The cooling water 5 flows through the water jacket 4 from a cooling water inlet 6 (see FIG. 2) formed in the lower portion of the cylinder block body 1 to remove the cylinder block and the cylinder liner 2. I try to cool.

Such a water jacket 4 is basically in the shape of a quadrangle as shown in the circumferential sectional view in FIG. 2, and the cooling water (indicated by the arrow) introduced from the cooling water inlet is first introduced into the inlet. Colliding with the front wall of 6 and bending at a right angle,
The cylinder block is rotated and discharged through a discharge port 7 (see FIG. 1) formed in the upper portion of the cylinder block body 1. The rectangular shape is used in order to efficiently cool the cylinder liner outer wall 21 by swirling the water flow of the cooling water 5 to obtain a swirling flow as described above.

However, at this time, since the cooling water swirls and rises while colliding with the wall surface of the cylinder block body 1 as described above, there is a drawback that the flow velocity gradually decreases and a stagnation 8 occurs at the final corner portion. . If such a stagnation 8 occurs, there is a drawback that cavitation and erosion occur on the cylinder liner outer wall 21 in the vicinity thereof.

In order to eliminate such a defect, as shown in FIG. 1, the cylinder liner outer wall 21 is plated with chrome 9 or the discharge pressure of the water pump is increased in order to increase the saturated steam pressure. Is being carried out.

However, such a method has a drawback that a step of plating the outer wall 21 of the cylinder liner 2 or a large capacity water pump is required.

(Object of the Invention) The present invention has been made in view of the above-mentioned points, and by changing the shape of the space for inserting the cylinder liner of the cylinder block, the stagnation described above is generated without lowering the cooling efficiency. It is an object of the present invention to provide a solid cylinder block.

(Structure of the Invention) In order to achieve such an object, the cylinder block according to the present invention is provided with a space for a cylinder liner in a cylinder block body, and the cylinder liner is inserted into this space to allow the cylinder block wall and the In a cylinder block in which a water jacket is formed between the outer walls of the cylinder liner, and the water jacket is provided with an inlet for introducing cooling water from the lower portion of the cylinder block body, the lower portion of the space is introduced from the cooling water inlet. It is characterized in that it has a collision wall against which the cooling water is collided, and the upper part of the collision wall of the space has a shape similar to the outer wall of the cylinder liner inserted into this space.

(Embodiment) FIG. 3 is a sectional view of an embodiment of the cylinder block of the present invention. As is clear from this figure, the cylinder block according to the present invention also has the cylinder liner 2 inserted into the cylinder block body 1. The space 3 is provided. As shown in the lower sectional view of FIG. 4, cooling water is provided in the lower portion of the cylinder block body 1 to the water jacket 4 constituted by the wall surface 31 of the cylinder block space 3 and the outer wall 21 of the cylinder liner 2. Is provided with a cooling water inlet 6 for introducing water, and a cooling water outlet 7 communicating with the water jacket 4 is formed on the upper side (see FIG. 1).

In the cylinder block having such a structure, in the present invention, as shown in FIG. 3, the space 3 for inserting the cylinder liner formed in the cylinder block body 1 has a shape similar to the outer wall 21 of the cylinder liner 2. In other words, the cooling water introduced from the cooling water introduction port 6 provided in the vicinity of the bottom of the cylinder block body 1 has a cylindrical shape, and the cooling water introduced in the cylinder liner 2 near the upper portion of the cylinder block.
It runs smoothly along the outer wall 21.

On the other hand, in the vicinity of the bottom of the cylinder block shown in FIG. 4, a collision wall 10 is formed so as to be substantially perpendicular to the direction of introduction of the cooling water from the cooling water introduction port 6, and the cooling water that collides with this portion. Is capable of obtaining a strong swirling flow (arrow a).

With such a configuration, the cylinder block body 1
When the cooling water is introduced from the cooling water introducing port 6 formed in the lower part of the cooling water, the cooling water collides with the collision wall 10 and a strong swirling flow a is obtained. However, at this time, since the swirling flow is obtained by colliding with the collision wall 10 immediately after the introduction of the cooling water, the flow velocity does not extremely decrease. The swirl flow a rises to cool the cylinder liner 2 from the outer wall of the cylinder liner 5 and is drained from the drain port 7. At this time, as shown in FIG. Since the space wall 3 is formed in a shape similar to the outer wall 21 of the cylinder liner 2, the flow of the cooling water is smooth, so that stagnation does not occur.

(Effects of the Invention) As described above, according to the cylinder block of the present invention, a collision wall for generating a swirling flow is provided near the cooling water inlet, and the upper portion thereof is a space similar in shape to the outer wall of the cylinder liner. Since it is formed in a shape, the cooling water introduced from the introduction port can obtain a strong swirling flow in the vicinity of the introduction port, and then smoothly flow. Therefore, there is an advantage that the swirling flow can maintain the cooling efficiency and prevent stagnation.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a conventional cylinder block, and FIG.
FIG. 3 is a lateral cross-sectional view of the cylinder block, FIG. 3 is a lateral cross-sectional view near the top of the present invention, and FIG. 4 is a cross-sectional view near the bottom of the present invention. 1 ... Cylinder block body, 2 ... Cylinder liner,
21 …… Cylinder liner outer wall, 3 …… Space, 5 …… Water jacket.

Claims (1)

[Scope of utility model registration request] 1. A cylinder block main body is provided with a space for a cylinder liner, and a cylinder liner is inserted into this space to form a water jacket between outer walls of the cylinder liner, and the cylinder jacket main body is placed below the water jacket. In a cylinder block provided with an inlet for introducing more cooling water, the lower portion of the space has a collision wall against which the cooling water introduced from the cooling water inlet collides, and the upper portion of the collision wall of the space is A cylinder block having a shape substantially similar to the outer wall of the cylinder liner inserted in this space.