JPS6347618Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an engine cooling device.

Conventionally, as an engine cooling system,
Like the device shown in Figure 1 described in No.-99620,
An impeller 6 fixed to the tip of a rotating shaft 5 supported by a pump case 4 is placed directly in front of a water jacket 3 partitioned by a cylinder block 1 and a cylinder liner 2, and cooling water is supplied by the rotation of the impeller 6. A centrifugal water pump has been proposed in which the cooling water from the supply path 7 passes through the pump case 4 and flows from the impeller 6 to the water jacket 3. This type of cooling device has an impeller installed on the outside of the cylinder block. This has the advantage that the longitudinal dimension of the engine can be made shorter than when the engine is placed in the same position.

By the way, since the impeller 6 is made of a large-diameter rectifying plate 6a with a large number of blades 6b, . There's a problem. Furthermore, since the impeller 6 requires thick rectifying plates 6a and blades 6b, there is also the problem that it is difficult to sufficiently shorten the longitudinal dimension of the engine.

This idea was made in view of the above-mentioned conventional problems, and it is possible to create an impeller by integrally forming a rectifying plate on the outer wall of the cylinder liner, which is parallel to the rotational surface of the impeller and closely opposed to one side of the impeller. This makes it possible to simultaneously reduce the weight, reduce the number of parts, and shorten the longitudinal dimension.

Hereinafter, embodiments of this invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, the cylinder block 1 is placed inside a water jacket 13 that is partitioned by a cylinder block 11 and a cylinder liner 12.
The impeller 16 at the tip of the rotating shaft 15 supported via the packing 18 by the bearing part 14a of the pump case 14 fixed to the
A pulley 20 of the timing belt 19 is stretched between the rear end and the crankshaft (not shown).
A centrifugal water pump having a configuration similar to the conventional one, in which the cooling water from the cooling water supply path 17 flows through the pump case 14 and from the impeller 16 into the water jacket 13 by rotation of the impeller 16 driven by the engine. It is 21.

The water pump 21 is configured such that a line connecting the centers of the cylinder bores and the center line of the rotating shaft 15 are offset.

On the other hand, the impeller 16 has a large number of blades 16b, which are formed by cutting and raising the outer periphery of a thin metal disk at equal angles.
..., 16b are integrally formed, and a boss 23 caulked at the center is fitted and fixed to the tip of the rotating shaft 15.

On the outer wall of the cylinder liner 12 facing the rotational surface of the impeller 16, there is a rectifying wall 24 that is parallel to the rotational surface of the impeller 16 and faces close to it with a small gap that does not contact one side of the impeller 16. are integrally formed.

The straightening wall 24 has an outer diameter S' that is substantially the same as the outer diameter S of the impeller 16, and a thickness t' that is substantially the same as the thickness t of the outer wall of the cylinder liner 12.

Note that the impeller 16 may be made of thin-walled casting.

Therefore, if the water pump 21 has the above-described configuration, when the impeller 16 rotates, the rectifying wall 24 on the cylinder liner 12 side will be directly connected to the impeller 16.
Since it functions as a rectifying plate integrated with the cooling water, the cooling water can be circulated normally as before.

As described above, in this invention, the rectifying wall of the impeller is integrally formed on the outer wall of the cylinder liner, so the impeller itself is lighter and the number of parts is reduced compared to the conventional sheet metal structure.

In addition, since the straightening wall can be built up along the thickness of the cylinder liner outer wall, it is possible to move the water pump closer to the engine by the thickness of the straightening wall, reducing the longitudinal dimension. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional cooling device, FIG. 2 is a sectional view of a cooling device according to this invention, and FIG. 3 is a perspective view of an impeller. 11...Cylinder block, 12...Cylinder liner, 13...Water jacket, 14...
Pump case, 15... Rotating shaft, 16... Impeller, 16b... Vane, 21... Water pump,
24... Rectification wall.

Claims (1)

[Claim for Utility Model Registration] An impeller of a centrifugal water pump is arranged to face directly into a water jacket divided by a cylinder block and a cylinder liner, and one side of the impeller is close to the outer wall of the cylinder liner. A cooling device for an engine, characterized in that a rectifying wall is integrally formed on the outer wall of the cylinder liner and is parallel to the rotating surface of the impeller and closely faces one side of the impeller.