JPH0835425A - Piston cooling nozzle - Google Patents

Abstract

PURPOSE:To provide a piston cooling nozzle capable of being easily attached to a limited space, and having a simple structure. CONSTITUTION:A fine hole 2 opening to an inlet 5 of a cooling cavity 4 provided on a piston 3 is provided on the tip of a piston main body 1, so as to constitute a main jet 6. A fine hole 7 opening to the back surface of the piston 3 other than the inlet 5 is bored on the intermediate part of the nozzle main body 1, so as to constitute a sub jet 8, thereby the degree of freedom of attachment of a piston cooling nozzle is increased, and the structure can be simplified, and also the manufacturing cost can be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston cooling nozzle for injecting cooling oil into a piston of an engine, and more particularly to a nozzle for injecting oil into a cooling cavity formed in the piston and the back surface of the piston at the same time. Is.

[0002]

2. Description of the Related Art Since the heat load on the piston increases as the performance of the engine increases, a cooling cavity is often provided in the piston in recent years, and oil is often injected and supplied to this cooling cavity. However, when the heat load on the piston further increases, the temperature on the back surface of the piston rises, so that the heat load on the connecting rod or the small end bush increases, which may cause burning.

In order to avoid such a situation, as seen in, for example, Japanese Utility Model Laid-Open No. 59-156114, a piston is provided at a part of a nozzle body provided with a main jet opening toward an opening of a cooling cavity. It has been proposed to construct a piston cooling nozzle by bulging a sub-jet that opens toward the back surface of the. However, in an actual engine, although the space inside the piston is extremely narrow, it is necessary to avoid interference with the piston and connecting rod. However, there is a problem in that the sub-jet is not practical because the nozzle mounting position is specified.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and provides a piston cooling nozzle having a simple structure that can be easily mounted in a limited space. That is the issue.

[0005]

In order to solve the above-mentioned problems, the present invention provides a main jet by providing pores at the tip of a nozzle body that open toward the inlet of a cooling cavity provided in a piston. It is characterized in that a sub jet is formed by forming a small hole, which is open toward the rear surface of the piston other than the inlet, in the intermediate portion of the nozzle body.

[0006]

When the engine is operated, the oil supplied to the nozzle body is injected and supplied from the main jet provided at the tip of the nozzle body toward the inlet of the cooling cavity. The oil injected and supplied to the inlet of the cooling cavity exchanges heat with the piston while flowing through the cooling cavity toward the outlet to cool the piston.

On the other hand, a part of the oil supplied to the nozzle main body is injected and supplied from the sub-jet provided in the middle portion thereof toward the back surface of the piston. Therefore, the back surface of the piston is also cooled by the oil, and the heat load on the connecting rod and the small end bush is reduced.

The oil flowing down from the outlet of the cooling cavity and the oil dripping from the rear surface of the piston are collected in the oil pan together with the oil returned from the various parts of lubrication, and the oil cooler is removed as necessary while removing foreign matters. After being cooled by, for example, it is circulated and supplied again to each part for lubrication and each part for cooling. In addition, since the sub jet is formed by forming a small hole in the middle of the nozzle body with the main jet at the tip, the piston cooling nozzle does not become large due to the provision of the sub jet, It is difficult to be restricted by the mounting position on the.

[0009]

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing the relationship between a piston cooling nozzle and a piston according to the present invention, and FIG. 2 is an enlarged sectional view of the piston cooling nozzle.

In these figures, a main jet 6 that opens toward an inlet 5 of a cooling cavity 4 provided in a piston 3 is formed by providing a pore 2 at the tip of a nozzle body 1 attached to a cylinder block (not shown). ing.
Further, by providing the pores 7 in the intermediate portion of the nozzle body 1 to form the sub-jet 8 that opens toward the back surface of the piston 3 other than the inlet 3, the sub-jet 8 is jetted from the main jet 6 and the sub-jet 8. Oil is used to cool the piston 3.

That is, when the engine is operated, the oil discharged from the oil pump (not shown) is supplied to the nozzle body 1. The oil supplied to the nozzle body 1 is
From the main jet 6 formed at the tip to the cooling cavity 4
It is injected and supplied toward the inlet 5. Inlet 5 for cooling cavity 4
The oil that has been injected and supplied to the cylinder 3 flows through the cooling cavity 4 toward the outlet 9 and exchanges heat with the piston 3 to cool the piston 3.

On the other hand, a part of the oil supplied to the nozzle body 1 is jetted and supplied from the sub jet 8 provided in the middle portion thereof toward the back surface of the piston 3. Therefore, the back surface of the piston 3 is also cooled by the oil, and the heat load on the connecting rod and the small end bush (not shown) is reduced.

The oil flowing down from the outlet of the cooling cavity and the oil dripping from the rear surface of the piston are collected in the oil pan together with the oil returned from the respective lubrication parts, and the oil cooler is removed as necessary while removing foreign matters. After being cooled by, for example, it is circulated and supplied again to each part for lubrication and each part for cooling.

Here, in the present invention, the sub jet 8 is formed by forming the pores 7 in the intermediate portion of the nozzle body 1 having the main jet 6 at the tip. Therefore, the piston cooling nozzle does not become large due to the provision of the sub-jet 8, it is hard to be restricted by the mounting position on the engine, and there is no need to add another component, so that the configuration is simplified. It

In the embodiment, the main jet 6 is formed by narrowing the tip of the nozzle body 1 made of pipe material to form the main jet 6 and ensuring the stability of the oil jet direction of the main jet 6. Although the sub-jet 8 is formed by piercing the fine hole 7 in the tapered portion provided in the nozzle body 1, the piercing position of the fine hole 7 forming the sub-jet 8 is not limited to the embodiment. Further, although the pores 7 are formed by electric discharge machining in the embodiment, the pores 7 may be formed by drilling or the like.

[0016]

As is apparent from the above description, according to the piston cooling nozzle of the present invention, the sub-jet is constructed only by forming the fine holes in the intermediate portion of the nozzle body having the main jet formed at the tip. Therefore, since the piston cooling nozzle does not become large due to the provision of the sub-jet, and it is difficult to be restricted by the mounting position on the engine, the degree of freedom of the mounting position of the nozzle is increased, and a separate part is required. Since there is no need to add it, the structure is simplified and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a relationship between a piston cooling nozzle and a piston according to the present invention.

FIG. 2 is an enlarged sectional view of the piston cooling nozzle shown in FIG.

[Explanation of symbols]

 1 Nozzle body 2 Pore 3 Piston 4 Cooling cavity 5 Inlet 6 Main jet 7 Pore 8 Sub jet 9 Outlet

Claims (1)

[Claims] 1. A main jet is formed by providing a fine hole opening toward an inlet of a cooling cavity provided in a piston at a tip of a nozzle body, and a fine hole opening toward a rear surface of the piston other than the inlet is formed into the nozzle. A piston cooling nozzle characterized in that a sub-jet is formed by drilling in the middle of the main body.