JPH055459A - Engine - Google Patents

Abstract

PURPOSE:To obtain an engine excellent in durability by forming a distance between the first/second piston rings increased longer in accordance with advancing from one oscillating side surface location to the other oscillating side surface location, in a piston. CONSTITUTION:A flow regulating gas passage, through which an annular gas chamber 11 specified between piston rings 3, 4 communicates with an engine combustion chamber 8, is formed by a gap 6 in both end butt parts of the piston ring 3. The piston ring 4 is arranged in a manner wherein a distance D2 is set larger than a distance D1, between the piston rings 3, 4. Thus by air-floating a piston 2 in a cylinder 1 based on a gas pressure of the gas chamber 11, introduced by a time difference in accordance with action of the flow regulating gas passage, and based on a difference of a pressure receiving area relating to the gas pressure sliding friction resistance between the other oscillating side surface of the piston and a cylinder side wall internal surface opposed to face this oscillating side surface is reduced to enable durability to improve.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to reciprocating engines.

[0002]

2. Description of the Related Art In a reciprocating engine, a technique has been proposed in which a roller is provided on a side surface of a piston in order to reduce sliding frictional resistance between an inner surface of a cylinder side wall and a side surface of the piston when the piston reciprocates.

[0003]

By the way, in the technique of providing such a roller, the weight of the piston increases and the inertia in the reciprocating motion of the piston increases, which deteriorates the responsiveness of the engine. Etc., the driving performance deteriorates. Therefore, a gas chamber to which the gas pressure from the combustion chamber is introduced is formed between the inner surface of the side wall of the cylinder and the side surface of the piston facing the inner surface of the side wall, and the gas pressure of this gas chamber causes the piston to move from the inner surface of the side wall of the cylinder. A technique has been proposed in which the sliding friction resistance between the inner surface of the cylinder side wall and the side surface of the piston due to the reciprocating motion of the piston is floated.

However, in the proposed technology, the piston is provided with a passage for guiding the gas pressure from the combustion chamber to the gas chamber, and the check valve is provided in this passage. Is satisfactory in terms of air-floating Biston, but the structure is a little complicated.

The present invention has been made in view of the above points, and an object thereof is to adjust a flow rate from a combustion chamber between an inner surface of a side wall of a cylinder and a side surface of a piston facing the inner surface of the side wall. A simple structure and durability in an engine in which a gas chamber is formed through which a gas pressure is guided, and the piston pressure is floated from the inner wall of the cylinder wall on the thrust side by using the gas pressure in this gas chamber by utilizing the time difference. To provide an engine with excellent performance.

[0006]

According to the present invention, the object is to provide a piston side surface and a piston side surface facing the piston side surface, which is located adjacent to the piston upper surface defining the engine combustion chamber. An annular combustion chamber and an engine combustion chamber defined between a first piston ring and a second piston ring disposed adjacent to the first piston ring, Forming a gas passage for adjusting the flow rate, and the distance between the first and second piston rings is such that the one swing side surface portion of the piston faces the other swing side surface portion. It is achieved by an engine in which the first and second piston rings are provided on the piston so that the length of the piston gradually increases toward

Further, according to the present invention, the object is to provide a piston side surface and a cylinder side wall inner surface facing the piston side surface at a portion of the first piston ring arranged adjacent to the piston upper surface defining the engine combustion chamber. Between the first piston ring and the second piston ring arranged adjacent to the first piston ring, the flow rate adjustment communicating the annular gas chamber and the engine combustion chamber The side surface of the piston which receives the gas pressure in the annular gas chamber and which forms the gas passage for It is also achieved by an engine in which the pistons are provided with first and second piston rings so that they are larger on the sides.

According to another aspect of the present invention, in the above engine, the first piston ring is arranged on the outer peripheral surface of the piston substantially parallel to the upper surface of the piston defining the engine combustion chamber, The piston ring is arranged on the outer peripheral surface of the piston so as to be inclined with respect to the first piston ring.

The gas passage for adjusting the flow rate in the present invention is
The first piston ring may be formed of a gap between the facing and separated both-end butting portions, or may be formed of a recess or a through hole provided in the first piston ring, and further, these may be formed. They may be combined with each other, as long as they are formed at the portion of the first piston ring so as to connect the annular gas chamber and the engine combustion chamber.

It is preferable that the abutting portions at both ends of the second piston ring in the present invention are closely contacted or fitted so that gas in the gas chamber does not leak through the abutting portions at both ends, but further. Preferably, a third piston ring is provided on the piston to prevent gas leaking from the abutting portions of both ends of the second piston ring.

In one example of the present invention, one swing side surface portion of the piston is a side surface portion on the anti-thrust side of the piston, and the other swing side surface portion of the piston is a side surface portion on the thrust side of the piston.

[0012]

In the engine of the present invention configured as above,
The distance between the first and second piston rings is gradually increased from one swing side surface portion of the piston toward the other swing side surface portion facing the side surface portion,
Alternatively, the pressure receiving area of the piston side surface that receives the gas pressure in the annular gas chamber is larger on one swing side surface side of the piston than on the other swing side surface side that faces this side surface. Since the second piston ring is provided on the piston, the piston has a cylinder interior based on the gas pressure of the gas chamber introduced with a time lag according to the flow rate adjusting action of the gas passage for adjusting the flow rate and the difference in the pressure receiving area with respect to the gas pressure. As a result of the air float, the sliding frictional resistance between the other oscillating side surface of the piston and the inner surface of the cylinder side wall facing the other oscillating side surface is reduced and the piston is reciprocated.

The present invention will be described below based on preferred embodiments shown in the drawings. This will make the above invention and other inventions clear.

The present invention is not limited to these specific examples.

[0015]

Concrete Example In FIGS. 1 and 2, piston rings 3, 4 and 5 are fitted above a piston 2 arranged in a cylinder 1. Opposing ends 41 and 5 of a piston ring 3 arranged on the outer peripheral surface of the piston 2 substantially parallel to the upper surface 7 of the piston 2 defining the engine combustion chamber 8.
1 are spaced apart to form a void 6 as a gas passage for adjusting the flow rate. As described above, in this example, the side surface 9 of the piston 2 and the cylinder 1 facing the side surface 9 of the piston 2 are located at the portion of the piston ring 3 arranged adjacent to the upper surface 7 of the piston 2 that defines the engine combustion chamber 8. Of the annular gas chamber 11 and the engine combustion chamber 8 defined between the piston ring 3 and the piston ring 4 arranged adjacent to the piston ring 3, The gas passage is formed by the space 6 between the abutting portions of the piston ring 3.

In the piston ring 4, the distance between the piston rings 3 and 4 is such that the side surface portion 15 on the anti-thrust side, which is one swing side surface portion of the piston 2, is opposed to the side surface portion 15 on the other side. Is arranged on the outer peripheral surface of the piston 2 inclining with respect to the piston ring 3 so that it gradually becomes longer as it goes to the side surface portion 16 on the thrust side, in other words, the distance D2 becomes longer than the distance D1. Has been done. As a result, the pressure receiving area of the side surface 9 of the piston 2 that receives the gas pressure in the annular gas chamber 11 is larger on the side surface portion 16 side on the thrust side than on the side surface portion 15 side on the anti-thrust side.

The abutting portions 12 of both ends of the piston ring 4 are
The gas in the gas chamber 11 is tightly abutted or fitted so as not to leak into the annular space defined between the piston rings 4 and 5 through the abutting portions 12 at both ends. The piston ring 5 further provided on the piston 2 is designed so that the gas leaked to the annular space defined between the piston rings 4 and 5 via the abutting portions 12 of the both ends of the piston ring 4 does not escape further to the outside. There is.

A connecting rod 14 is connected to the piston 2 via a shaft 13.

In the engine constructed as described above, the gas pressure generated by the explosion in the combustion chamber 8 in the explosion stroke is adjusted in the flow rate through the gap 6 and consequently is generated in the gas chamber 11 in the combustion chamber 8. It is introduced with a time lag relative to the gas pressure. The piston 2 receives the biased side pressure of the gas chamber 11 and reciprocates to levitate with respect to the side wall inner surface 10, particularly the side wall inner surface 10 on the side surface portion 16 side on the thrust side. The piston 2 levitated against the inner surface 10 of the side wall by the gas pressure reciprocates with extremely low sliding frictional resistance, and this reciprocation causes the piston 2 to swing in the direction A about the shaft 13 (swing). However, due to the biased gas side pressure in the gas chamber 11, the rocking is prevented. That is, the piston 2 can reciprocate without the side surface 9 of the piston 2 on the side surface portion 16 side contacting the inner wall surface on the thrust side of the inner wall surface 10 of the cylinder 1, and in addition to the above, a much lower sliding friction resistance. With this, it is possible to reciprocate, and it is possible to improve the fuel efficiency of the engine.

[0020]

As described above, according to the engine of the present invention, the side surface of the piston faces the side surface of the piston at the portion of the first piston ring disposed adjacent to the upper surface of the piston defining the combustion chamber of the engine. An annular gas chamber and an engine combustion chamber defined between the inner surface of the cylinder side wall and between the first piston ring and the second piston ring disposed adjacent to the first piston ring. A gas passage for communicating a flow rate that communicates with each other is formed, and as the distance between the first and second piston rings increases from one swing side surface portion of the piston toward the other swing side surface portion facing this side surface portion. The pressure receiving area of the side surface of the piston that gradually increases in length or receives the gas pressure in the annular gas chamber is such that the side surface of one side of the piston that faces the side surface of the other side As larger it was, because they provided the first and second piston rings on the piston,
The structure can be made extremely simple, and the durability can be excellent, and further, the swinging of the piston due to the reciprocating motion can be prevented and the sliding friction resistance can be reduced.

[Brief description of drawings]

FIG. 1 is a partial sectional side view of a preferred embodiment of the present invention.

FIG. 2 is a plan view of the piston ring shown in FIG.

[Explanation of symbols]

 1 cylinder 2 piston 3 piston ring 4 piston ring 6 air gap D1 distance D2 distance

Claims (1)

Claim: What is claimed is: 1. A portion of a first piston ring disposed adjacent to an upper surface of a piston defining an engine combustion chamber,
Specified between the piston side surface and the inner surface of the cylinder side wall facing the piston side surface, and between the first piston ring and the second piston ring arranged adjacent to the first piston ring. A gas passage for communicating a flow rate is formed to connect the annular gas chamber and the engine combustion chamber, and the distance between the first and second piston rings is from one swing side surface portion of the piston to this swing side surface portion. To gradually become longer as it goes to the other swinging side surface part that faces,
An engine in which first and second piston rings are provided on the piston. 2. A portion of a first piston ring disposed adjacent to an upper surface of a piston defining an engine combustion chamber,
Specified between the piston side surface and the inner surface of the cylinder side wall facing the piston side surface, and between the first piston ring and the second piston ring arranged adjacent to the first piston ring. A gas flow passage for communicating the annular gas chamber and the engine combustion chamber is formed to form a gas passage for adjusting the flow rate. An engine in which a first piston ring and a second piston ring are provided on a piston so as to become larger on the side of the other swing side surface portion facing the side surface portion on the moving side. 3. The first piston ring is arranged on the outer peripheral surface of the piston substantially parallel to the upper surface of the piston defining the engine combustion chamber, and the second piston ring is arranged with respect to the first piston ring. The engine according to claim 1, wherein the engine is inclined and disposed on the outer peripheral surface of the piston. 4. The engine according to any one of claims 1 to 3, wherein the gas passage is formed by a gap between both ends of the first piston ring facing each other and spaced apart from each other. 5. The engine according to claim 1, wherein the gas passage is formed by a recess formed in the first piston ring. 6. The piston according to claim 1, wherein one of the swing side surface portions of the piston is a side surface portion on the anti-thrust side of the piston, and the other swing side surface portion of the piston is a side surface portion on the thrust side of the piston. The engine according to item 1.