JPS6349557Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the performance of piston rings for reciprocating internal combustion engines.

In conventional piston rings for reciprocating internal combustion engines, the commonly used ring aperture shapes are the right angle aperture shown in Figure 1a, and the right angle aperture shown in Figure 1b.
There are diagonal openings shown in Figure 1 and stepped openings shown in Figure 1c. A ring with such an abutment shape is called a general abutment type ring. Note that 01 is the piston ring and 02 is the gap. On the other hand, in order to maintain sufficient airtightness between the cylinder and the piston, the shape of the ring abutment is changed to a second shape.
There are some that are shown in Figures a and b. A ring having such an abutment shape that hardly causes gas to blow through to the lower part from the abutment is called a gas-tight ring. FIGS. 2a and 2b show a step abutment in which a side wall 03 is provided on the inner peripheral side of one abutment and reaches the lower surface of the ring. All of these types of rings are well known.

When comparing these general butt-shaped rings and gas-tight rings, the gas-tight type provides very good results in terms of gas sealing, but on the other hand, it has a complicated shape and is more likely to cause breakage at the abutment.

In the gas-tight type abutment shape shown in Figure 2, breakage is likely to occur particularly at the locations shown in Figure 3, and if a breakage occurs, the abutment shape is at right angles to the general abutment type ring. It will be almost the same as a joint. In addition, 01a in FIG. 3 shows a cut surface, and 01b shows a cut piece.

In addition, for low-speed, medium-sized diesel engines, diagonal joints are more commonly used than right-angled joints in order to improve startability and ignition performance.

The purpose of this invention is to focus on the above points, and to have a gas-tight opening shape in terms of gas sealing, and even if breakage occurs at the opening, it will maintain the same function as a ring with a diagonal opening. The purpose of the present invention is to provide a gas-tight type piston ring that has a side wall on the inner circumferential side of one end and a stepped abutment, in which the stepped portion and the lower surface are connected to each other. This is because an abutment is formed between them by slanting the opposing end surfaces.

The piston ring according to the present invention can be applied to piston rings of all reciprocating internal combustion engines.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4a is a perspective view showing a state in which the abutment portion of an embodiment of the present invention is opened, and FIG. 4b is a perspective view showing the state in which it is assembled.

In the figure, 1 is the piston ring body, 2 is the abutment, and 5 is the outer peripheral surface.

The shape of the abutment part 2 is the conventional gas-tight shape, that is, it has a side wall 3 on the inner peripheral side and forms a step abutment having a step part 4, and in the event that a cut occurs at the X part. However, the structure retains the shape of the diagonal opening.

That is, an abutment 6 is formed between the step portion 4 and the lower surface of the ring, with opposing end surfaces being inclined.

This inclination angle θ should be 30° to 60°, and the gap between g
is determined to be the same as that for a general diagonal abutment ring.

The operation in the case of the above configuration will be described.

The piston ring according to the present invention has the function of a normal gas-tight type ring, and even if breakage occurs at the joint part, the same function as a diagonal joint type ring will remain.

In the above case, blow-by of gas due to cut-off of the joint can be suppressed to a minimum.

[Brief explanation of the drawing]

Figures 1a, b, and c are explanatory diagrams showing the shape of the abutment part of a conventional general abutment type piston ring, respectively, and Figures 2a and b are explanatory diagrams showing the shape of the abutment part of a conventional gas-tight type piston ring. , FIG. 3 is an explanatory diagram showing a broken state of the abutment part in FIG. 2, FIG. 4a is a perspective view showing the state of the abutment part in an embodiment according to the present invention when it is released, and FIG. 4b FIG. 2 is a perspective view showing the assembled state. 1...Piston ring body, 2...Joint part,
3...side wall, 4...step, 6...joint.

Claims (1)

[Scope of utility model registration request] A gas-tight type piston ring having a side wall on the inner peripheral side of one end and a step abutment, characterized in that the abutment is formed between the step and the lower surface with the opposing end surface inclined. piston ring.