JPH04298673A - Engine - Google Patents

Abstract

PURPOSE:To provide an engine capable of effectively preventing clogging of a passage for guiding the gas pressure from a combustion chamber to a gas chamber, in the engine of which the gas chamber, to which gas pressure from the combustion chamber is introduced, is formed between the inner face of side wall of a cylinder and the side of a piston opposite to the former, and the piston is floated from the inner face of side wall of the cylinder by the gas pressure of the gas chamber. CONSTITUTION:An engine 30 is provided with a communicating passage 9 to communicate a gap 24 between the inner face 23 of side wall of a cylinder 1 and the side 8 of a piston 2 opposite to the former with a combustion chamber 6 in the piston 2, and a check valve 12 to check back flow of gas from the gap 24 to the combustion chamber 6 is arranged in the passage 9. Seal rings 18 are provided on the side 8 of the piston 2, surrounding the opening end 16 of the passage 9 opened to the gap 24, and a projection 15 extending to the contracted passage 9 is provided on the valve body 10 of the check valve 12 seating on a valve seat 13 formed by contracting the diameter of the passage 9.

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 rollers are provided on the side surface of the piston in order to reduce the sliding frictional resistance between the inner surface of the cylinder side wall and the side surface of the piston during the reciprocating motion of the piston.

0003

[Problems to be Solved by the Invention] However, with the technology of providing such rollers, the weight of the piston increases and the inertia of the piston during its reciprocating motion increases, resulting in poor engine response and, for example, poor acceleration performance. etc., the driving performance deteriorates. Therefore, a gas chamber 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, into which the gas pressure from the combustion chamber is guided, and the gas pressure in this gas chamber moves the piston from the inner surface of the side wall of the cylinder. A technique has been proposed in which the piston is floated to reduce the sliding frictional resistance between the inner surface of the cylinder side wall and the side surface of the piston during reciprocating motion of the piston.

However, in the proposed technology, a passage is provided in the piston to guide the gas pressure from the combustion chamber to the gas chamber, but this passage may be damaged due to adhesion or accumulation of unburned carbon residue, etc. If it becomes clogged, there is a possibility that the piston will not be able to float from the inner surface of the side wall of the cylinder as desired.

The present invention has been made in view of the above points, and its object is to prevent gas pressure from the combustion chamber 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. This effectively prevents clogging of the passage for guiding the gas pressure from the combustion chamber to the gas chamber in an engine in which a piston is floated from the inner surface of the side wall of the cylinder by the gas pressure in the gas chamber. Our goal is to provide you with an engine that will help you.

[0006]

[Means for Solving the Problems] According to the present invention, the object is to provide the piston with a passage that communicates the combustion chamber with the gap between the inner surface of the cylinder side wall and the piston side surface facing the inner surface of the cylinder side wall. A check valve is placed in the passageway to prevent gas from flowing back into the combustion chamber from the gap, and a seal ring is provided on the side of the piston to surround the open end of the passageway opening into the gap.The diameter of the passageway is reduced. This is achieved by an engine in which the valve body of the check valve, which is seated on the valve seat of the check valve, is provided with a protrusion extending into a passage having a reduced diameter.

According to the present invention, the object is to provide a passage in the piston that communicates the combustion chamber with a gap between the inner surface of the cylinder side wall and the side surface of the piston facing the inner surface of the cylinder side wall; A check valve is placed to prevent the backflow of gas into the combustion chamber, and a seal ring is provided on the side of the piston surrounding the open end of the passage that opens into the gap, and the check valve is placed at one end that opens into the combustion chamber. This can also be accomplished by an engine in which a movable element is disposed in the passageway between the parts and the piston, which moves within the passageway under the influence of the reciprocating motion of the piston.

In one aspect of the invention, the portion of the passage in which the mover is disposed extends in the same direction as the reciprocating direction of the piston, so that the mover is most affected by the reciprocating motion of the piston. It moves vigorously within the passage and effectively removes carbon residue within the passage.

The mover in the present invention may have any form as long as it can move freely within the passage and clean the passage, but one preferred example is a coil spring. can be presented.

[0010] In the present invention, the valve body of the check valve, which is seated on the valve seat formed by reducing the diameter of the passage, may be simply provided with a protrusion extending into the reduced diameter passage, or an opening into the combustion chamber may be provided. in the passageway between one end of the check valve and the part where the check valve is arranged,
Although it is possible to simply arrange a movable element that moves within the passage under the influence of the reciprocating motion of the piston, in a preferred example, these are combined.

[0011]

[Operation] In the engine of the present invention configured as described above,
The valve body of the check valve, which sits on the valve seat formed by reducing the diameter of the passage, is provided with a protrusion that extends into the reduced diameter passage.
As the check valve opens and closes, the protrusion also moves along the diameter-reduced passage. This movement of the protrusion removes carbon residue and the like that tend to accumulate in the reduced diameter passage, so that the passage is always kept clean.

Furthermore, in the engine of the present invention, in which a movable element is provided in the passage between one end that opens into the combustion chamber and a portion where the check valve is disposed, the movable element also opens into the combustion chamber due to the reciprocating movement of the piston. For example, the mover vibrates relative to the piston in the passage between the one end that opens into the combustion chamber and the part where the check valve is located. This removes carbon residue, etc. that tend to accumulate in the passageway between the two, so that the passageway is always kept clean.

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

It should be noted that the present invention is not limited to these specific examples in any way.

[0015]

[Specific Example] In FIGS. 1 to 3, a piston ring 3 and an oil paddle ring 4 are fitted above a piston 2 disposed in a cylinder 1. The side wall 5 of the piston 2 has a top surface 7 of the piston 2 that defines a combustion chamber 6 and a top surface 7 of the piston 2 that defines a combustion chamber 6.
A passage 9 is formed which communicates with the side surface 8 of the passage 9.
A check valve 12 consisting of a valve body 10 and a coil spring 11 is arranged. As shown in FIG. 3, the valve body 10 is seated on a valve seat 13 which is a diameter-reduced passage 9, and one end surface of the valve body 10 has a valve seat 13 extending inside a portion 14 of the passage 9 whose diameter is reduced by the valve seat 13. A projection 15 is integrally provided. An annular recess 17 is formed in the side surface 8 surrounding the open end 16 of the passage 9 on the side surface 8 , and a sealing ring 18 is fitted into the annular recess 17 . A spring ring 21 is installed between one annular side circumferential surface 19 of the seal ring 18 and the bottom surface 20 of the annular recess 17, and the spring ring 21 causes the seal ring 18 to close to the other annular side circumferential surface. The seal ring 18 is biased so that the seal ring 22 is brought into airtight pressure contact with the inner side wall 23 of the cylinder 1, and in this way, the seal ring 18 is pressed against the inner surface 23 of the side wall of the cylinder 1 and the side surface 8 of the piston 2 facing the inner surface 23 of the side wall. A gas chamber 25 is formed in the gap 24 between the two. Further, a recess 26 is formed in the outer peripheral surface of the seal ring 18, into which a plurality of seal rings 27 are fitted.

Note that a connecting rod 28 is connected to the piston 2.

As described above, in the engine 30 of this example, the gap 24 between the side wall inner surface 23 of the cylinder 1 and the side surface 8 of the piston 2 facing the side wall inner surface 23 of the cylinder 1 and the combustion chamber 6
A passage 9 communicating with the piston 2 is provided in the piston 2, and a check valve 1 is installed in the passage 9 to prevent backflow of gas from the gap 24 to the combustion chamber 6.
2, a seal ring 18 is provided on the side surface 8 of the piston 2 surrounding the open end 16 of the passage 9 opening into the gap 24, and the check valve is seated on a valve seat 13 formed by reducing the diameter of the passage 9. Twelve valve bodies 10 are provided with protrusions 15 extending into passages 9 having a reduced diameter.

Therefore, in the engine 30, the gas pressure generated by explosion in the combustion chamber 6 during the explosion stroke passes through the passage 9, opens the check valve 12, and enters the gas chamber defined by the seal ring 18 in the gap 24. 25 will be introduced. Piston 2
receives the side pressure of the gas chamber 25 and floats against the side wall inner surface 23 during its reciprocating motion. The gas pressure introduced into the gas chamber 25 is prevented from escaping from the passage 9 by the check valve 12 except during the explosion stroke, and the gas pressure is prevented from escaping from the passage 9 by the seal rings 18 and 2.
7 also reliably prevents gas from leaking through the annular recess 17 and the like. The piston 2, which is floated against the inner surface of the side wall 23 by gas pressure, reciprocates with extremely low sliding friction resistance. Furthermore, when the piston 2 does not include rollers or the like as in this example, the influence of the inertia of the piston 2 is reduced, and the response performance of the engine does not deteriorate.

In the engine 30, the protrusion 15 in the opening/closing valve of the check valve 12 is connected to the portion 14 of the passage 9 whose diameter is reduced.
Since it moves relative to the piston 2, the movement removes carbon residue and prevents it from accumulating, thereby preventing clogging of the portion 14 due to carbon residue and the like.

By the way, in the engine 30, carbon residue etc. are removed from the portion 14, but in addition, as shown in FIG. 4, one end 41 opening into the combustion chamber 6 and the projection 15 are extended. A coil spring 42 as a movable element is disposed movably in the direction A in a passage 9 extending in the same direction as the reciprocating direction A of the piston 2 between the diameter-reduced portion 14 and the engine 43. It may be configured. At this time, a snap ring 4 is attached near one end 41 to prevent the coil spring 42 from slipping out from the passage 9 into the combustion chamber 6.
Attach 4.

In the engine 43 of this embodiment, the coil spring 42 due to inertia due to the reciprocating movement of the piston 2 causes the piston 2 to close in the passage 9 between the one end 41 that opens into the combustion chamber 6 and the location where the check valve 12 is disposed. Since it moves up and down relative to the engine, the movement removes carbon residue and prevents it from accumulating.Therefore, one end 41 that opens into the combustion chamber 6 and the reduced diameter portion 14 where the protrusion 15 extends. It is also possible to prevent clogging of the passage 9 between the two by carbon residue or the like.

[0022]

As described above, according to the engine of the present invention, the valve body of the check valve that sits on the valve seat formed by reducing the diameter of the passage is provided with a protrusion that extends into the reduced diameter passage. Therefore, the movement of the protrusion according to the opening/closing valve of the check valve removes carbon residue, etc. that tends to accumulate in the narrowed passage, so the passage is constantly cleaned, and the gas pressure from the combustion chamber is reduced. This effectively prevents clogging of the passage leading to the gas chamber.

[0023] Furthermore, in the engine of the present invention, a movable element that moves within the passage under the influence of the reciprocating motion of the piston is disposed in the passage between one end opening into the combustion chamber and the part where the check valve is disposed. According to the above, in order to keep the passage between the one end opening into the combustion chamber and the part where the check valve is placed in a constantly cleaned state, and to guide the gas pressure from the combustion chamber to the gas chamber. can effectively prevent clogging of passageways.

[Brief explanation of drawings]

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

FIG. 2 is a front view of the specific example shown in FIG. 1;

FIG. 3 is a partially enlarged sectional view of the specific example shown in FIG. 1;

FIG. 4 is a partially enlarged sectional view of another preferred embodiment of the present invention.

[Explanation of symbols]

1 Cylinder 2 Piston 6 Combustion chamber 9 Passage 10 Valve body 12 Check valve 13 Valve seat 15 Protrusion 18 Seal ring 24 Gap 25 Gas chamber 42 Coil spring

Claims (7)

[Claims] Claim 1: The piston is provided with a passage that communicates the combustion chamber with a gap between the inner surface of the cylinder side wall and the side surface of the piston facing the inner surface of the cylinder side wall, and the passage is provided with a passageway that allows gas to flow back from the gap to the combustion chamber. A valve body of a check valve that is arranged with a check valve to prevent the obstruction and a seal ring provided on the side of the piston surrounding the open end of a passage that opens into the gap, and that sits on a valve seat formed by reducing the diameter of the passage. The engine is provided with a protrusion extending into a passage having a reduced diameter. [Claim 2] A movable element that moves within the passage under the influence of the reciprocating motion of the piston is disposed in the passage between the one end that opens into the combustion chamber and the reduced diameter portion where the projection extends. The engine according to item 1. 3. The engine according to claim 2, wherein a portion of the passage in which the mover is disposed extends in the same direction as the reciprocating direction of the piston. 4. The engine according to claim 2, wherein the mover comprises a coil spring. 5. The piston is provided with a passage that communicates the combustion chamber with a gap between the inner surface of the cylinder side wall and the side surface of the piston facing the inner surface of the cylinder side wall, and the passage is provided with a passage that allows gas to flow back from the gap to the combustion chamber. A passageway between one end that opens into the combustion chamber and the part where the check valve is disposed, in which a seal ring is provided on the side of the piston surrounding the open end of the passageway opening into the gap. The engine is equipped with a mover that moves in a passage under the influence of the reciprocating motion of the piston. 6. The engine according to claim 5, wherein a portion of the passage in which the mover is disposed extends in the same direction as the reciprocating direction of the piston. 7. The engine according to claim 5, wherein the mover comprises a coil spring.