JPH0561562U - piston ring - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent an increase in blow-by amount and a sudden increase in blow-by amount due to fluttering. [Structure] A piston ring 1 has a taper surface whose outer periphery 2 is tapered to incline inward from a lower end to an upper end, and an inner periphery 3 is also tapered to incline outward from a lower end to an upper end. Form a tapered surface. The taper angle θ ₁ of the inner peripheral surface 3 is made larger than the taper angle θ of the outer peripheral surface 2.
Therefore, when the piston ring 1 is mounted in the ring groove of the piston inserted in the cylinder, the ring upper and lower surfaces 7 and 8 are at a right angle to the cylinder inner wall surface, or the ring upper and lower surfaces 7 and 8 are 8 is inclined upward from the inside to the outside, and when the engine is operating,
The entire lower surface 8 of the ring or the end portion on the inner peripheral side is in close contact with the lower surface of the ring groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piston ring of an internal combustion engine, and more particularly to a piston ring having a tapered outer circumference.

[0002]

[Prior Art]

 The compression ring also serves as an oil scraping action to prevent the oil that has passed through the oil ring from going to the combustion chamber, and especially the second ring has a great role to play.

Therefore, conventionally, a ring having a tapered outer circumference is often used for the second ring and the like. This ring has a tapered outer circumference and forms a taper surface that inclines inward from the lower end to the upper end.Since the tapered outer circumference forms an angle with the cylinder inner wall surface, the inside of the cylinder during the upward stroke of the piston It is easy to form an oil film on the wall surface, which has the effect of scratching the oil down the stroke.

[0004]

[Problems to be solved by the device]

 However, as shown in FIG. 3, when the outer peripheral taper ring 1A is mounted in the cylinder 4, the ring upper and lower surfaces 7 and 8 incline upward from the outer side to the inner side, and the lower surface on the inner peripheral side rises. Present.

As a result, when the engine is operated, a gap is created between the lower surface 8 on the inner peripheral side of the ring 1A and the lower surface 10 of the ring groove 6, and the combustion gas that has circulated to the back surface of the ring enters the above-mentioned gap, This is a major factor in the rise in second ring, which causes an increase in blowby and a sharp increase in blowby volume due to the occurrence of fluttering.

An object of the present invention is to prevent an increase in blow-by amount.

[0007]

[Means for Solving the Problems]

 The present invention relates to a piston ring having a taper surface whose outer periphery is tapered to inwardly incline from the lower end to the upper end, and the inner periphery is also tapered to taper outwardly from the lower end to the upper end. It is characterized by making a face.

Then, the taper angle of the inner peripheral surface is made larger than the taper angle of the outer peripheral surface, and when the taper angle of the inner peripheral surface is set in the cylinder, the upper and lower surfaces of the ring are perpendicular to the inner wall surface of the cylinder. It may be an angle to take a posture to make, or an angle to take a posture in which the upper and lower surfaces of the ring are inclined upward from the inner side to the outer side when mounted in the cylinder.

[0009]

[Action]

 The outer circumference is tapered to form a taper surface that inclines inward from the lower end to the upper end.In the piston ring, the inner circumference is also taper processed to form a taper surface that inclines outward from the lower end to the upper end. When the piston ring is mounted in the cylinder, the upper and lower surfaces of the ring are at a right angle to the inner wall surface of the cylinder, or the upper and lower surfaces of the ring are inclined upward from the inside to the outside. Therefore, when the engine is in operation, it is possible to prevent the combustion gas that has come around to the rear surface of the ring from entering the lower surface side of the ring. Also, when gas pressure is applied to the taper surface on the inner peripheral side, the piston ring is pressed against the lower surface of the ring groove, so that lifting of the ring can be prevented. As a result, the blow-by amount can be prevented from increasing, and fluttering hardly occurs, so that the blow-by amount can be prevented from rapidly increasing.

[0010]

【Example】

 FIG. 1 is a vertical sectional view showing a part of a piston ring showing an embodiment of the present invention, FIG. 2 (A) is a vertical sectional view when the piston ring is mounted in a cylinder, and FIG. It is a longitudinal cross-sectional view when the piston ring which made the taper angle of an inner peripheral surface larger than the piston ring of A) is mounted in a cylinder.

Referring to FIG. 1, a piston ring 1 of the present invention has an outer circumference 2 which is tapered to form a taper surface which inclines inward from a lower end to an upper end, and an inner circumference 3 is also tapered to form a lower end to an upper end. It forms a taper surface that slopes outward toward. The taper angle θ ₁ of the inner peripheral surface 3 is larger than the taper angle θ of the outer peripheral surface 2.

Therefore, when the piston ring 1 is mounted in the ring groove 6 of the piston 5 inserted in the cylinder 4, as shown in FIG. Take a posture that forms a right angle with the inner wall surface 9.

Therefore, even when the combustion gas circulates around the back surface of the ring 1 during engine operation, the entire surface of the ring lower surface 8 is in close contact with the lower surface 10 of the ring groove 6 and no gap is formed between them. Can be prevented from entering the ring lower surface 8 and lifting the ring. Further, when the gas pressure is applied to the tapered surface on the inner circumference 3 side, the piston ring 1 is subjected to a force in the direction of pressing it against the lower surface 10 of the ring groove 6, and the lifting of the ring 1 can be prevented.

In FIG. 2 (A), the ring mounted in the cylinder has a taper angle of the inner peripheral surface set so that the entire lower surface of the ring closely contacts the lower surface of the ring groove during engine operation. However, FIG. 2B shows an example in which the lower surface of the ring on the outer peripheral surface side is lifted.

In FIG. 2B, the taper angle θ ₂ of the inner peripheral surface 3 of the piston ring 1 is larger than the taper angle θ ₁ of the inner peripheral surface 3 of the piston ring 1 in FIG. 2A. There is.

Therefore, when the piston ring 1 is mounted in the ring groove 6 of the piston 5 inserted in the cylinder 4, as shown in FIG. Take a posture inclining upward from the outside.

Therefore, even when the combustion gas circulates to the back surface of the ring 1 during engine operation, the inner peripheral end of the ring lower surface 8 is in close contact with the lower surface 10 of the ring groove 6, so that the combustion gas is transferred to the ring. It is possible to prevent the ring from rising by coming into the lower surface 8. Further, when the gas pressure is applied to the taper surface on the inner circumference 3 side, the piston ring 1 receives a force in the direction of pressing it against the lower surface 10 of the ring groove 6, so that the ring 1 can be prevented from being lifted.

[0018]

[Effect of the device]

 As described above, according to the present invention, in a piston ring having a tapered outer surface and a taper surface that inclines inward from the lower end to the upper end, the inner circumference is also tapered to move from the lower end to the upper end. By forming a taper surface that slopes outward, it is possible to prevent combustion gas that has come around to the back surface of the ring from entering the bottom surface of the ring when the engine is operating, and to lift the ring, and also to prevent tapering on the inner peripheral side. When the gas pressure is received at, the piston ring is pressed against the lower surface of the ring groove, and the ring is prevented from lifting. Therefore, the blow-by amount can be prevented from increasing and fluttering is less likely to occur, so that the blow-by amount can be prevented from rapidly increasing.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a part of a piston ring showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the piston ring of the present invention mounted in a cylinder.

FIG. 3 is a vertical sectional view when a conventional piston ring is mounted in a cylinder.

[Explanation of symbols]

1 piston ring 2 outer peripheral surface 3 inner peripheral surface 4 cylinder 5 piston 6 ring groove 7 ring upper surface 8 ring lower surface 9 cylinder inner wall surface 10 ring groove lower surface θ, θ ₁ , θ ₂ taper angle

Claims (4)

[Scope of utility model registration request] 1. A piston ring, the outer periphery of which is tapered so as to be inwardly inclined from a lower end to an upper end, wherein the inner periphery is also tapered and a tapered surface is inclined outward from a lower end to an upper end. A piston ring that is characterized by 2. The piston ring according to claim 1, wherein the taper angle of the inner peripheral surface is larger than the taper angle of the outer peripheral surface. 3. The taper angle of the inner peripheral surface is made larger than the taper angle of the outer peripheral surface, and the taper angle of the inner peripheral surface is such that when mounted in the cylinder, the upper and lower surfaces of the ring are perpendicular to the inner wall surface of the cylinder. The piston ring according to claim 1, wherein the piston ring has an angle to take a posture. 4. The taper angle of the inner peripheral surface is made larger than the taper angle of the outer peripheral surface, and when the taper angle of the inner peripheral surface is mounted in the cylinder, the upper and lower surfaces of the ring move upward from the inner side to the outer side. The piston ring according to claim 1, wherein the piston ring has an inclined posture.