JPH05240347A - Piston abrasion-proof ring for engine - Google Patents

Abstract

PURPOSE:To provide a piston-abrasion-proof ring for engine, by which cooling function of a piston ring groove is sufficiently provided, and which does not cause manufacturing defect by reducing the thickness of a barrel annular part as thin as possible. CONSTITUTION:A barrel annular part 3 for recycling a cooling agent is formed out of a molding body 4 of the cross section of the letter U, separately beside an abrasive-proof ring main body part 2 having a piston ring groove 1, and the abrasion-proof ring main body part 2 is formed out of a piston 6 component material, for example, of an abrasive-proof cast Ni-resist material, rather than an aluminum alloy, at high temperature. The molding body 4 is formed out of stainless steel, and a spigot-like fitting part 5 is provided around an inner circumferential surface 2a which is an end part to be connected to the molding body 4, of the abrasive-proof ring main body part 2 in the circumferential direction, and the molding body 4 is fitted into the fitting part 5, and is fixed by arc welding and so on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine piston wear ring, and more particularly, to an engine piston wear ring capable of efficiently cooling the vicinity of a top ring groove of a diesel engine piston with a coolant. Regarding

[0002]

2. Description of the Related Art In recent years, diesel engines have tended to operate at high speed and with a high load, and the heat load on the piston and the like has become severe, and the piston is a typical one. The vicinity of the top ring groove of the piston becomes hot due to thermal energy due to compression and explosion.In addition, soot is often generated due to carbonization and combustion of engine lubricating oil and adheres, rubbing against the piston ring and the function of the piston ring deteriorates. However, oil consumption tends to increase.

In order to improve this, in the vicinity of the top ring groove of the piston made of an aluminum alloy, a wear resistant ring made of a cast Niresist material, which is more wear resistant at a temperature higher than that of the aluminum alloy of the piston body, is cast and wrapped. Various attached pistons have been proposed. One of them is, for example, Japanese Utility Model Publication No. 58-52346, which discloses a wear-resistant ring made of a cast Niresist material integrally provided with a body ring portion for circulating a coolant for cooling a piston ring groove. ing.

[0004]

However, since the wear resistant ring is formed by integrally casting the body ring portion, the wall thickness of the body ring portion,
That is, the wall thickness between the body ring portion and the piston ring groove was inevitably increased, and the cooling performance of the piston ring groove was insufficient.

In order to solve such a problem, for example,
Forming the body ring part separately from the wear resistant ring main body part made of cast metal by a metal plate, for example, a molded body made of stainless steel or the like and having a substantially U-shaped cross section, and not joined to the wear resistant ring main body part Therefore, it is possible to set the wall thickness between the body ring portion and the piston ring groove to be thin. However, since the molded body is usually manufactured by roll-molding a metal plate or the like, there is springback or the like, so that the molded body should be manufactured accurately (the joint end of the molded body is the inner peripheral surface of the wear-resistant ring main body portion). Is difficult to manufacture), and it is difficult to satisfactorily bond it with the wear-resistant ring main body portion, which may cause manufacturing defects.

Therefore, an object of the present invention is to provide a piston ring wear ring for an engine in which the thickness of the body ring portion is made as thin as possible so that the cooling performance of the piston ring groove can be sufficiently obtained and the manufacturing failure does not occur. To provide.

[0007]

In order to achieve the above object, the present invention comprises a casting material having a body ring portion for circulating a coolant and having higher wear resistance than the piston constituent material at high temperature. In a cast engine piston wear resistant ring, the body ring portion is formed separately from the cast wear resistant ring body portion by a molded body having a substantially U-shaped cross section made of a metal plate,
A piston wear ring for an engine, characterized in that a fitting insert portion is formed on one of the joint ends of the molded body and the wear resistant ring main body portion for the other to be fitted.

In the present invention, it is preferable that the wear-resistant ring main body portion is formed of a cast niresist material and the body ring portion is formed of stainless steel.

[0009]

According to the present invention, the body ring part is formed separately from the wear resistant ring main body part made of a casting by a molded product made of a metal plate and having a substantially U-shaped cross section. Since the other is fitted and inserted into the fitting insertion portion provided on either one of the joining ends, the wall thickness between the body ring portion and the piston ring groove can be set thin, Further, the joining between the molded body and the wear resistant ring main body portion is sure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of a piston wear ring for an engine of the present invention. FIG. 1 is an enlarged sectional view showing an embodiment of the wear ring of the present invention, and FIG. 2 is shown in FIG. FIG. 3 is an enlarged cross-sectional view showing a modified example of the wear-proof ring shown in FIG. 3, and FIG. 3 is a partial cross-sectional view of an engine piston provided with the wear-proof ring shown in FIG.

As shown in FIG. 1, the wear-resistant ring A of the present embodiment separates from the wear-resistant ring main body portion 2 having the piston ring groove 1 and separates the coolant by a molded body 4 having a substantially U-shaped cross section. The body ring portion 3 is formed. The wear-resistant ring main body portion 2 is formed of a casting material having higher wear resistance than the piston constituent material (for example, an aluminum alloy) at a high temperature, for example, a cast niresist material, and the molded body 4 is a metal plate,
For example, it is formed of stainless steel and has an annular shape.

The wear-resistant ring main body portion 2 is provided with a bevel-like fitting insertion portion 5 along the circumferential direction on an inner peripheral surface 2a which is a joint end portion with the molded body 4. After the molded body 4 is fitted in the portion 5 to perform accurate positioning, the molded body 4 is fixed by arc welding or the like. As shown in FIG. 2, notches 5a and 5a into which the joint ends 4a and 4a of the molded body 4 are fitted may be provided on the inner peripheral surface 2a of the wear resistant ring main body portion 2.

As shown in FIG. 3, the wear resistant ring A is cast-in near the top ring groove of the piston 6 made of aluminum alloy, and the ring groove 1 forms the top ring groove of the piston 6.

The wear-resistant ring A constructed as described above has a body 4 made of stainless steel and having a substantially U-shaped cross section joined to the wear-resistant body 2 made of a cast Niresist material. The wall thickness between the body ring portion 3 and the ring groove 1 can be set as thin as possible compared to the case where the portion 3 and the wear resistant ring main body portion 2 are integrally formed by casting. 1, and the ring groove 1 can be sufficiently cooled by the coolant that recirculates the body ring portion 3.

Further, a fitting insertion portion 5 into which the molded body 4 is fitted and inserted into the inner peripheral surface which is the joint end portion of the wear resistant ring main body portion 2.
Since the molded body 4 is provided, even if there are variations in the roll molding process such as spring back, the fitting portion 5
The molded body 4 comes into close contact with the fitting insertion portion 5 by being fitted into the fitting insertion portion 5. Therefore, the wear-resistant ring main body portion 2 and the molded body 4 can be joined to each other more reliably than in the case where they are simply butted and arc-welded, and the coolant flowing back through the body ring portion 3 is unlikely to leak and reliability is improved. high.

In the above embodiment, the molded body 4 is made of stainless steel. However, the molded body 4 is not limited to this and may be made of another steel plate or the like. Further, although the case where the fitting insertion portion 5 is provided on the wear resistant ring body portion 2 is shown, it may be provided on the molded body 4 side. Further, although the case where the ring carrier main body portion 2 and the molded body 4 are joined by arc welding or the like is shown, the invention is not limited to this and various joining means can be applied.

[0018]

As described above, according to the present invention, the wall thickness of the body ring portion is made as thin as possible to sufficiently obtain the cooling performance of the piston ring groove, and at the same time, the wear resistant ring body portion and the molding are formed. It is securely joined to the body and does not cause manufacturing defects.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of a wear resistant ring of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a modified example of the wear resistant ring shown in FIG.

FIG. 3 is a partial cross-sectional view of an engine piston provided with the wear resistant ring shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring groove 2 Wear-resistant ring main body part 2a Joint end part 3 Body ring part 4 Molded body 5 Fitting insertion part 6 Piston

Claims (2)

[Claims] 1. A piston wear ring for an engine, which is made of a casting material and has a body ring portion that recirculates a coolant and is more wear-resistant than a piston constituent material at a high temperature. , A molded body made of a metal plate and having a substantially U-shaped cross section, which is formed separately from the wear-resistant ring main body made of casting, and the other end is fitted into either one of the joint ends of the molded body and the wear-resistant ring main body. A piston wear ring for an engine, characterized in that a fitting insertion portion is formed. 2. The engine piston wear resistant ring according to claim 1, wherein the wear resistant ring main body portion is formed of a cast niresist material, and the body ring portion is formed of stainless steel.