CN219548987U - Piston for engine and marine diesel engine - Google Patents

Abstract

The utility model discloses a piston for an engine and a marine diesel engine, which solve the problem that in the prior art, gas rings are overlapped and easily leak gas, and have the beneficial effect of improving the sealing performance of the gas rings, and the specific scheme is as follows: the utility model provides a piston for engine, includes the piston head, and the piston head sets up three at least piston ring in the hoop, and first piston ring sets up first gaseous ring, and second piston ring sets up the second gaseous ring, and the third piston ring sets up the oil ring, and every intra-annular side all sets up the convex part, and first piston ring and second piston ring all set up concave part, and corresponding concave part is gone into to the convex part card of first gaseous ring and second gaseous ring, and the concave part of first piston ring and second piston ring staggers the setting angle and sets up the intra-annular side.

Description

Piston for engine and marine diesel engine

Technical Field

The utility model relates to the field of engines, in particular to a piston for an engine and a marine diesel engine.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The first gas ring and the second gas ring on the piston can axially rotate around the piston groove in the running process of the marine diesel engine, when the notch of the first gas ring and the notch of the second gas ring are rotationally overlapped, the piston can leak gas, the service life of the piston and the piston ring assembly is reduced, and the performance of the engine is influenced.

The prior art discloses a piston ring for an automobile, wherein a top ring, a supporting ring and an oil ring are buckled in a piston ring groove of the same piston, the positions of the top ring, the supporting ring and the oil ring are fixed and limited through a limiting frame, the tightness degree and the positions of the top ring, the supporting ring and the oil ring buckled piston can be conveniently adjusted, but the inventor finds that the piston ring cannot be used for the existing marine diesel engine, and structures except the piston ring can interfere with a cylinder sleeve, so that the piston ring is not suitable for practical use.

In the scheme, two gas rings are assembled into a piston groove, the sealing performance is improved by improving the oil ring structure, and the two gas rings are provided with gas ring cuts, so that the gas rings can rotate in the working process of the piston, and the risk of overlapping gas leakage still exists.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model aims to provide the piston for the engine, solve the problem of piston air leakage caused by overlapping of two gas ring cuts, and improve the sealing performance of the gas ring of the piston.

In order to achieve the above object, the present utility model is realized by the following technical scheme:

the utility model provides a piston for engine, includes the piston head, and the piston head sets up three at least piston ring in the hoop, and first piston ring sets up first gaseous ring, and second piston ring sets up the second gaseous ring, and the third piston ring sets up the oil ring, and every gaseous ring inboard all sets up the convex part, and first piston ring and second piston ring all set up the concave part, and corresponding concave part is gone into to the convex part card of first gaseous ring and second gaseous ring, and the concave part stagger of first piston ring and second piston ring sets up the angle.

In the piston for the engine, the length of the concave part is longer than that of the convex part, so that the rotation of the first gas ring or the second gas ring relative to the piston head is ensured.

The piston for an engine described above, wherein the convex portion is a convex portion on an inner side of the first gas ring or the second gas ring;

or, the first gas ring or the second gas ring is provided with an opening, and the convex part is a cylindrical pin inserted into the opening.

In the piston for an engine, the gas ring rotates due to the fact that the gas ring is arranged at two positions up and down, the first gas ring is provided with the first notch, the second gas ring is provided with the second notch, the convex part of the gas ring is engaged with the corresponding concave part to limit the rotation range of the first gas ring or the second gas ring, and the first notch and the second notch are arranged in a staggered mode.

In the piston for an engine described above, one end of the protrusion is flush with one end of the first cutout or the second cutout for ease of manufacture.

In the piston for the engine, the first gas ring rotates relative to the first piston ring groove, the second gas ring rotates relative to the second piston ring groove, the concave part accommodates the convex part, and the length of the concave part is 1.5-15 times of the length of the convex part.

In the piston for an engine, since the upper and lower gas rings are provided, the angle of the concave portion in the first piston ring groove or the second piston ring groove is 30 ° -180 ° in order to ensure that the upper and lower concave portions are staggered.

In the piston for an engine described above, the protrusion has a width smaller than that of the first or second gas ring in consideration of the engagement of the protrusion with the recess and the strength of the piston head is ensured.

In the above-described piston for an engine, the height of the protruding portion may be equal to or less than the thickness of the first gas ring or the second gas ring.

In the piston for the engine, the oil ring is provided with the third notch, and the first notch and the second notch are arranged in a staggered mode with the third notch.

In a second aspect, the utility model also provides a marine diesel engine, comprising the piston for the engine.

The beneficial effects of the utility model are as follows:

1) According to the utility model, the first gas ring and the second gas ring are both provided with the convex parts, the first piston ring groove and the second piston ring groove are both provided with the concave parts into which the convex parts can be clamped, and the length of the concave parts is larger than that of the convex parts, so that when the gas ring rotates relative to the piston head, the convex parts move along the concave parts, the concave parts have a set length to play a limiting role on the rotation of the gas ring, the two concave parts are arranged in a staggered mode by a set angle, the movement range of the gas ring is limited, the irregular free circumferential rotation of the gas ring is ensured, the overlapping of corresponding notches of the first gas ring and the second gas ring is effectively avoided, the problem of air leakage is avoided, the sealing performance is fully improved, the service life of a piston and a piston ring assembly is prolonged, and the engine performance is improved.

2) According to the utility model, the convex part is arranged at the first notch of the first gas ring or the second notch of the second gas ring and is clamped into the concave part, so that the whole structure is simple, the processing and assembling manufacturability is good, the cost is low, and the realization is facilitated; the convex part of the gas ring is clamped with the concave part corresponding to the piston ring groove during assembly, so that assembly error prevention is realized, and compared with a piston ring without the convex part, the assembly is good; and the gas ring is not weakened by arranging the convex parts on the gas ring, so that the service life of the gas ring is ensured.

3) The convex part is arranged on the first gas ring or the second gas ring, so that the processing is convenient, the service life of the first gas ring or the second gas ring is not influenced, and the concave part is arranged on the first piston ring groove or the second piston ring groove, so that the influence on the mechanical strength of the piston is small, and the processing is facilitated.

4) The length of the concave part is longer than that of the convex part, so that the rotation of the gas ring can be effectively ensured, the repeated abrasion and the local abrasion of a certain point of the first gas ring or the second gas ring are avoided, and the service lives of the first gas ring and the second gas ring are ensured.

5) In the utility model, one end of the convex part is flush with one end of the first notch or the second notch, namely, the convex parts are respectively arranged at the first notch and the second notch, thereby being convenient for processing and manufacturing the first gas ring and the second gas ring and also being convenient for assembling the first gas ring and the second gas ring.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a schematic illustration of a piston for an engine according to one or more embodiments of the utility model.

Fig. 2 is an enlarged schematic illustration of a boss at a gas ring in a piston for an engine in accordance with one or more embodiments of the present utility model.

Fig. 3 is an enlarged schematic view of a boss at a gas ring in a piston for an engine according to one or more embodiments of the present utility model.

In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustration is only schematic.

Wherein: 1-a first gas ring, 1.1-a first notch, 1.2-a convex part, 2-a second gas ring, 2.1-a second notch, 3-an oil ring, 3.1-a third notch, 4-a piston head and 4.1-a concave part.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular forms also are intended to include the plural forms unless the present utility model clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

as described in the background art, in the prior art, there is a problem of air leakage caused by overlapping air rings, and in order to solve the technical problem as described above, the utility model provides a piston for an engine.

Example 1

In an exemplary embodiment of the present utility model, referring to fig. 1, 2 and 3, a piston for an engine includes a piston head 4, at least three piston ring grooves are circumferentially disposed on the piston head 4, the piston ring grooves include a first piston ring groove, a second piston ring groove and a third piston ring groove, the first piston ring groove is provided with a first gas ring 1, the second piston ring groove is provided with a second gas ring 2, the third piston ring groove is provided with an oil ring 3, a convex portion 1.2 is provided on an inner side surface of each gas ring, the first piston ring groove and the second piston ring groove are provided with concave portions, the convex portions of the first gas ring and the second gas ring are snapped into the corresponding concave portions, and the concave portions of the first piston ring groove and the second piston ring groove are staggered for setting an angle.

Specifically, the first piston ring groove is provided with a first concave part, the second piston ring groove is provided with a second concave part, the first gas ring is provided with a first convex part, the first convex part is clamped into the first concave part, the second gas ring is provided with a second convex part, the second convex part is clamped into the second concave part, and the first concave part and the second concave part are staggered for a set angle and are arranged in a non-overlapping mode.

It can be understood that the concave part 4.1 is arranged on the piston head 4, has little influence on the strength of the piston head 4, is beneficial to processing realization, the length of the concave part 4.1 is longer than that of the convex part 1.2, the convex part 1.2 is clamped into the concave part 4.1, and the first gas ring and the second gas ring realize limited-angle rotation in the corresponding concave parts, so that the local abrasion of the gas ring is avoided; the convex part 1.2 is clamped into the concave part 4.1, so that the processing and assembling manufacturability is good, the cost is low, and the realization is facilitated; and the first boss must be clamped into the first concave part during assembly, and the second boss must be clamped into the second concave part, so that assembly mistake proofing is realized, and the problem of air leakage of the first air ring and the second air ring is effectively avoided.

In addition, the first gas ring has a first cutout, and the second gas ring has a second cutout.

For convenient manufacturing, one end of the convex part is flush with one end of the first notch or the second notch, namely, the convex part is arranged at the first notch or the second notch, and the processing and assembly requirements of the piston ring from a blank to a finished product are considered to be lower than those of the piston ring at other positions, so that errors are not easy to occur, the processing and manufacturing of the two gas rings are convenient, and the assembly of the two gas rings is also convenient.

Of course, in other examples, one end of the protrusion may extend beyond one end of the first cutout or the second cutout, so long as the first cutout and the second cutout are not affected.

Because the convex part is clamped with the concave part, the convex part is arranged close to the first notch 1.1 or the second notch 2.1, the two concave parts are staggered for a set angle, and the first notch of the first gas ring and the second notch of the second gas ring are naturally arranged in a staggered way; in addition, the oil ring is provided with a third notch, and the first notch and the second notch are arranged in a staggered mode with the third notch.

It can be understood that the first air ring 1 and the second air ring 2 are annular, the inner side surfaces of the first air ring 1 and the second air ring 2 are the inner surfaces corresponding to the circumferential direction of the air ring, which is equivalent to that the inner surfaces of the first air ring 1 and the second air ring 2 are provided with convex parts 1.2 formed by convex plates at one side of the first notch or the second notch, so that the width of the first air ring at one side of the first notch or the second air ring at one side of the second notch is increased. In other examples, the first gas ring or the second gas ring is provided with an opening, the protruding portion is a cylindrical pin inserted into the opening, and the cylindrical pin may be another structural member as long as the protruding portion can be inserted into the opening and formed on the inner side surface of the corresponding gas ring.

Considering the rotation of the first gas ring relative to the first piston ring groove, the rotation of the second gas ring relative to the second piston ring groove, the concave part 4.1 accommodates the convex part 1.2, and the length of the concave part is 1.5-15 times of the length of the convex part.

Considering that the two concave parts are arranged in a staggered manner, the angle of the concave part in the first piston ring groove or the second piston ring groove is 30-180 degrees, in some examples, the angle of the concave part in the first piston ring groove or the second piston ring groove is 60-120 degrees, the axial rotation range of the convex part is 60-120 degrees, and thus the concave part positions of the first piston ring groove or the second piston ring groove are arranged in a non-overlapping manner, the first notch and the second notch can not be overlapped when rotating, and the phenomenon of overlapping leakage can not be caused; of course, in other examples, the recess may be 120 ° -180 ° in angle at the first piston ring groove or the second piston ring groove.

Considering the cooperation of the convex portion 1.2 with the concave portion 4.1 and ensuring the strength of the piston head 4, the width of the convex portion is smaller than that of the first gas ring 1 or the second gas ring 2; the height of the protruding part is smaller than or equal to the thickness of the first gas ring 1 or the second gas ring 2, preferably, the height of the protruding part is equal to the thickness of the first gas ring 1 or the second gas ring 2; the width of the first gas ring 1 or the second gas ring 2 refers to the radial width of the first gas ring 1 or the second gas ring 2, and the thickness of the first gas ring 1 or the second gas ring 2 refers to the height of the first gas ring 1 or the second gas ring 2 when being mounted in the corresponding piston ring groove.

In this embodiment, the first air ring 1 and the second air ring 2 are provided with the convex parts, the first piston ring groove and the second piston ring groove are both provided with the concave parts into which the convex parts can be clamped, and the length of the concave parts is larger than that of the convex parts, so that when the first air ring 1 or the second air ring 2 rotates relative to the piston head, the convex parts move along the concave parts, and the concave parts have a set length to play a limiting role on the rotation of the first air ring 1 or the second air ring 2, and the two concave parts are arranged in a staggered way, so that the movement range of the first air ring 1 or the second air ring 2 is limited, the overlapping of the first notch and the second notch is effectively avoided, the problem of air leakage is avoided, the sealing performance is fully improved, the service life of a piston and a piston ring assembly is prolonged, and the engine performance is improved.

Example two

The embodiment provides a marine diesel engine, comprising the piston for the engine according to the first embodiment.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a piston for engine, its characterized in that includes the piston head, and the piston head sets up three at least piston ring in the hoop, and first piston ring sets up first gaseous ring, and second piston ring sets up the second gaseous ring, and the third piston ring sets up the oil ring, and every gas ring inboard all sets up the convex part, and first piston ring and second piston ring all set up the concave part, and corresponding concave part is gone into to the convex part card of first gaseous ring and second gaseous ring, and the setting angle setting is staggered to the concave part of first piston ring and second piston ring.

2. The piston for an engine according to claim 1, wherein a length of said concave portion is longer than a length of said convex portion.

3. The piston for an engine according to claim 1, wherein the convex portion is a projection on an inner side of the first gas ring or the second gas ring;

or, the first gas ring or the second gas ring is provided with an opening, and the convex part is a cylindrical pin inserted into the opening.

4. The piston for an engine of claim 1, wherein the first gas ring has a first cutout and the second gas ring has a second cutout, the first cutout and the second cutout being offset.

5. The piston for an engine according to claim 4, wherein one end of said projection is flush with one end of said first cutout or said second cutout.

6. The piston for an engine according to claim 1, wherein the length of said concave portion is 1.5 to 15 times the length of said convex portion.

7. The piston for an engine according to claim 1, wherein an angle of the recess in the first piston ring groove or the second piston ring groove is 30 ° to 180 °.

8. The piston for an engine according to claim 1, wherein a width of the convex portion is smaller than a width of the first gas ring or the second gas ring;

the height of the protruding portion is smaller than or equal to the thickness of the first gas ring or the second gas ring.

9. The piston for an engine according to claim 4, wherein the oil ring has a third cutout, and the first cutout, the second cutout, and the third cutout are offset from each other.

10. A marine diesel engine comprising a piston for an engine according to any one of claims 1-9.