CN216142820U

CN216142820U - Piston and piston ring composite structure

Info

Publication number: CN216142820U
Application number: CN202120051087.0U
Authority: CN
Inventors: 韦良锦
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2022-03-29
Anticipated expiration: 2031-01-08

Abstract

The embodiment of the application discloses a piston and piston ring combined structure, which is used for reducing the phenomenon of carbon deposition formed in a piston ring groove, thereby reducing the cost or reducing the phenomenon of damage of an engine due to the carbon deposition. The embodiment of the application comprises the following steps: the piston comprises a piston body, a piston ring assembly and a cylinder sleeve; the piston ring assembly is provided with a first ring, the first ring is provided with a step-shaped opening, and the first ring is an air ring and is used for transferring heat absorbed by the top of the piston to the wall of the cylinder; the piston body is arranged in the cylinder sleeve; a piston ring groove is formed in the piston body, and the first ring on the piston ring assembly is embedded into the piston ring groove at the uppermost position on the piston body; the section shape of the first ring is trapezoidal, two angles at the lower end of the section are right angles, the angle at which the upper end of the section is close to the piston is an obtuse angle, and the angle at which the upper end of the section is far away from the piston is an acute angle.

Description

Piston and piston ring composite structure

Technical Field

The embodiment of the application relates to the field of engines, in particular to a piston and piston ring combined structure.

Background

The piston ring is a core component in the interior of a fuel engine, and completes the sealing of fuel gas together with a cylinder, a piston, a cylinder wall and the like. According to functional classification, piston rings are divided into two categories: a compression ring and an oil ring. The compression ring can be used for sealing the combustible mixed gas in the combustion chamber; the oil ring is used to scrape off the excessive oil on the cylinder. The piston ring is a metal elastic ring with large outward expansion deformation, is embedded in the piston groove, and is in reciprocating and rotating motion, and forms sealing between the outer circular surface of the ring and the cylinder and one groove surface of the ring and the ring groove by means of pressure difference of gas or liquid.

When the engine runs at idle speed, the opening degree of a throttle valve is reduced in order to save energy consumption. This will cause a large negative pressure to be formed in the combustion chamber of the engine, and if the idling time of the engine reaches a certain period of time, the engine oil will be sucked back, that is, the engine oil will be sucked back into the combustion chamber. Suck-back of engine oil into the combustion chamber can cause carbon deposition in the combustion chamber, increased oil consumption and formation of carbon deposition in the piston ring groove, leading to increased cost or damage to the engine.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a piston and piston ring combined structure, which is used for reducing the phenomenon of carbon deposition formed in a piston ring groove.

In order to achieve the above purpose, the present application provides the following technical solutions:

the piston comprises a piston body, a piston ring assembly and a cylinder sleeve;

the piston ring assembly is provided with a first ring, the first ring is provided with a step-shaped opening, and the first ring is an air ring and is used for transferring heat absorbed by the top of the piston to the wall of the cylinder;

the piston body is arranged in the cylinder sleeve;

a piston ring groove is formed in the piston body, and a first ring on the piston ring assembly is embedded into the uppermost piston ring groove on the piston body;

the section shape of the first ring is trapezoidal, two angles at the lower end of the section are right angles, the angle at the upper end of the section, which is close to the piston, is an obtuse angle, and the angle at the upper end of the section, which is far away from the piston, is an acute angle.

Optionally, the piston ring assembly further includes a second ring and a third ring, the second ring and the third ring are both provided with bevel-opening type openings, the third ring is an oil ring, and the second ring and the third ring are used for scraping off engine oil attached to the cylinder liner;

the piston body is provided with a piston ring groove, and the second ring and the third ring on the piston ring assembly are respectively embedded into the piston ring groove in the middle and at the lowest part of the piston body;

the lateral clearance distance of second ring and piston ring groove the lateral clearance distance of first ring and piston ring groove with the lateral clearance distance of third ring and piston ring groove sets up different size.

Optionally, the lateral clearance distance between the first ring and the piston ring groove is 0.08 to 0.14mm, the lateral clearance distance between the second ring and the piston ring groove is 0.06 to 0.1mm, and the lateral clearance distance between the third ring and the piston ring groove is 0.04 to 0.08 mm;

optionally, the opening direction of the piston ring groove is set to be inclined upwards by a preset angle, and the upper end face of the piston ring groove is parallel to the lower end face.

Optionally, the predetermined angle is between 5 and 25 degrees.

Optionally, the second ring is of a unfilled-angle type ring structure, and a notch is formed in an angle, far away from the piston, of the lower end of the section.

Optionally, the clearance distance between the outer end face of the piston ring bank of the piston body and the cylinder sleeve is 0.3 mm.

Optionally, the first ring, the second ring and the third ring of the piston ring assembly are provided with a semi-mosaic structure coating on the outer circumferential surface of the contact part with the cylinder liner, and the semi-mosaic structure coating is used for increasing the wear resistance of the piston ring.

Optionally, the semi-mosaic structure coating is a wear-resistant chromium plating coating.

Optionally, an axial oil return hole is formed in the outer end of the piston ring bank at the bottom of the oil scraper ring groove of the piston body, and the axial oil return hole is used for increasing the axial oil return area.

According to the technical scheme, the embodiment of the application has the following advantages:

in the above technical scheme, the piston body is arranged in the cylinder sleeve, the piston body is provided with a piston ring groove, and a first ring, a second ring and a third ring on the piston ring component are sequentially embedded into the piston ring groove from top to bottom. The sectional shape of the first ring is trapezoidal, two angles at the lower end of the section are right angles, the angle at the upper end of the section close to the piston is an obtuse angle, the angle at the upper end of the section far away from the piston is an acute angle, and due to the adoption of the single-ladder structure, the carbon scraping capacity of the first ring is improved while the sealing performance is improved, the occurrence of the phenomenon of carbon deposition formed in a piston ring groove is reduced, and therefore the cost is reduced or the phenomenon of damage of an engine due to the carbon deposition is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic illustration of a piston body with a section of a ring groove having a butterfly configuration according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a piston body and cylinder liner combination according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural view of a piston ring assembly provided by an embodiment of the present application;

FIG. 4 is a schematic view of a piston ring body having a chromium-plated coating according to an embodiment of the present disclosure;

FIG. 5 is a partially enlarged structural view of a cross section of a first ring according to an embodiment of the present application;

fig. 6 is a schematic perspective view of a piston according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1 to 6, a piston and piston ring assembly includes a piston body 1, a piston ring assembly 2, and a cylinder sleeve 3. The piston ring assembly 2 has three rings, two gas rings and one oil ring. First ring 21, second ring 22 and third ring 23, first ring 21, second ring 22 and third ring 23 all are provided with the notch cuttype opening, and the notch cuttype opening makes the leakproofness of three rings improve.

The first ring 21 is an air ring for transferring heat absorbed at the top of the piston to the cylinder wall, the second ring 22 is an air ring, the third ring 23 is an oil ring, and the second ring 22 and the third ring 23 are used for scraping off the engine oil attached to the cylinder liner.

The piston body 1 is arranged in the cylinder sleeve 3, and the area formed by the piston body and the cylinder sleeve is a combustion chamber. The piston body 1 is provided with a piston ring groove 4, and a first ring 21, a second ring 22 and a third ring on the piston ring component are embedded into the piston ring groove 4 in sequence from top to bottom. The first ring 21 has a trapezoidal cross section, two angles at the lower end of the cross section are right angles, an angle at the upper end of the cross section close to the piston is an obtuse angle, and an angle at the upper end of the cross section far away from the piston is an acute angle. The plane that this kind of structure made up with piston ring groove 4 of the lower terminal surface of terminal surface is favorable to promoting the sealing effect of ring, and the trapezoidal face of the ring of up end, at the piston ring motion in-process, because the angle of first ring 21 and ring groove angle do not accomplish the same, the ring has slight radial motion, is favorable to promoting the carbon ability of scraping of ring like this, prevents that the piston ring card from dying in the ring groove.

On the basis of the above, the thicknesses of the second ring 22 and the third ring 23 need to be changed to increase the sealing performance of the whole structure, and the principle is as follows:

because the inclination angle of the up end of the first ring 21 is different from the inclination angle of the piston ring groove 4, this will reduce the original high sealing performance of the first ring 21, for this reason, need to reduce the size of the clearance between the first ring 21, the second ring 22 and the third ring 23 and the piston ring groove 4 properly, reduce the oil and flee like the channel area of combustion chamber, the clearance suggestion control of piston ring subassembly 2 and piston ring groove 4 is at: the first ring is controlled to be about 0.08-0.14 mm, the second ring is controlled to be 0.06-0.1 mm, and the third ring is controlled to be 0.04-0.08 mm. The structure can improve the whole sealing performance and increase the carbon scraping function.

The piston ring groove 4 will be described in detail below.

The opening direction of the piston ring groove 4 of the second ring 22 is set to be inclined upward by a predetermined angle, and the upper end surface and the lower end surface of the piston ring groove 4 are parallel.

In order to reduce the friction between the piston ring component 2 and the cylinder sleeve 3, the axial height of the piston ring component 2 is about 0.5-1 mm lower than that of the structure of the national five standards, so that the deformation of the piston is aggravated, particularly in the power stroke of ignition, one end of the section of the piston ring is propped against the cylinder sleeve 3, one end of the section of the piston ring does not have a supporting effect and can run downwards, the piston ring component 2 has an upward warping deformation trend, the piston ring groove 4 is made into an upward warping angle A, the angle A is about 5-25 degrees, the deformation of the piston ring component 2 is well compensated, after the piston ring component 2 is integrally distorted and deformed, the end face of the piston ring groove 4 can still keep parallel sealing with the upper side face and the lower side face of the piston ring, and the structure is suitable for being applied to the piston with the structure of the rectangular ring groove.

Secondly, in order to increase the oil scraping capability of the piston ring assembly 2, the second ring 22 adopts a corner-lacking type ring structure, and the oil scraping capability is further improved than that of a conical surface structure due to the corner portion of the corner-lacking type ring. However, the oil scraped by the second ring 22 is too much, and if the oil cannot be returned to the bottom case in time, the oil still flows up to the combustion chamber, so that an axial oil return structure of the piston, namely an axial oil return hole 11, is introduced for increasing the axial oil return area.

And 6 to 8 semicircular structures with the diameters of phi 4 to phi 8 are additionally arranged below the piston ring groove 4 of the third ring 23, so that the axial oil return area is increased, and the engine oil scraped by the second ring 22 and the third ring 23 is facilitated, and the oil is returned to the bottom shell in time. Because the axial oil return hole 11 is supplemented, the oil return area is not required to be increased by increasing the clearance between the piston ring land and the cylinder sleeve 3, the clearance F between the cylinder sleeve 3 and the piston ring land can be further reduced to 0.3mm, the running stability of the piston in the cylinder sleeve is improved, and the knocking noise is reduced.

Meanwhile, the whole excircle surface of the piston ring component 2 is not contacted with the cylinder sleeve 3, so that only a chromium-plated wear-resistant coating is added on the excircle surface contacted with the cylinder sleeve 3, namely the semi-mosaic coating is beneficial to further reducing the manufacturing cost of the piston ring.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for explaining relative positional relationships between the respective members or components, and do not particularly limit specific mounting orientations of the respective members or components.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, the structures, the proportions, the sizes, and the like, which are illustrated in the accompanying drawings and described in the present application, are intended to be considered illustrative and not restrictive, and therefore, not limiting, since those skilled in the art will understand and read the present application, it is understood that any modifications of the structures, changes in the proportions, or adjustments in the sizes, which are not necessarily essential to the practice of the present application, are intended to be within the scope of the present disclosure without affecting the efficacy and attainment of the same.

Claims

1. A piston and piston ring composite structure, characterized by comprising: the piston comprises a piston body, a piston ring assembly and a cylinder sleeve;

the piston body is arranged in the cylinder sleeve;

a piston ring groove is formed in the piston body, and the first ring on the piston ring assembly is embedded into the piston ring groove at the uppermost position on the piston body;

the section shape of first ring is trapezoidal, two angles of sectional lower extreme are the right angle, sectional upper end is close to the angle of piston is the obtuse angle, sectional upper end is kept away from the angle of piston is the acute angle.

2. The piston and piston ring assembly as set forth in claim 1, wherein said piston ring assembly further comprises a second ring and a third ring, said second ring and said third ring each having a beveled opening, said third ring being an oil ring, said second ring and said third ring being adapted to scrape off engine oil adhering to the liner;

the lateral clearance distance of second ring and piston ring groove, the lateral clearance distance of first ring and piston ring groove with the lateral clearance distance of third ring and piston ring groove sets up different size.

3. The piston and piston ring combination as set forth in claim 2 wherein said first ring is spaced from said ring groove by a distance of 0.08 to 0.14mm, said second ring is spaced from said ring groove by a distance of 0.06 to 0.1mm, and said third ring is spaced from said ring groove by a distance of 0.04 to 0.08 mm.

4. The piston and piston ring assembly as set forth in claim 3, wherein the opening direction of said ring groove is set to be inclined upward by a predetermined angle, and the upper end surface and the lower end surface of said ring groove are parallel.

5. The piston and piston ring assembly as set forth in claim 4 wherein said predetermined angle is between 5 and 25 degrees.

6. The piston and piston ring assembly as set forth in claim 4 wherein said second ring is of a missing angle type, and a notch is formed in the lower end of said cross-section away from the piston.

7. The piston and piston ring combination structure as claimed in claim 2, wherein the clearance distance between the outer end face of the piston land of the piston body and the cylinder liner is 0.3 mm.

8. The piston and piston ring assembly as set forth in claim 2 wherein said first, second and third rings of said piston ring assembly are provided with a semi-insert coating on the outer circumferential surface of the portion thereof in contact with the liner, said semi-insert coating being for increasing the wear resistance of the piston ring.

9. The piston and piston ring assembly as set forth in claim 8 wherein said semi-insert coating is a wear resistant chrome plated coating.

10. The piston and piston ring combination structure as claimed in claim 9, wherein the outer end of the piston ring land at the bottom of the scraper ring groove of the piston body is provided with an axial oil return hole for increasing the axial oil return area.