CN219509723U - Piston capable of generating asymmetric oil return performance - Google Patents

Abstract

The utility model discloses a piston for generating asymmetric oil return performance, which relates to the technical field of pistons and comprises a piston head and a piston skirt, wherein the piston head and the piston skirt are integrally distributed to form a piston body; the piston skirt is combined with one side of the piston head to form a piston inner cavity; pin holes for mounting piston pins are formed on two sides of the piston skirt part oppositely; the piston head and the piston skirt part are provided with a plurality of groups of first oil return holes, and oil scraped by the oil ring can enter the inner cavity of the piston through the first oil return holes in the moving process of the piston head and the piston skirt part, and the first oil return holes are distributed on the periphery of the pin hole, so that the pin hole can be cooled, the overhigh temperature of the piston pin and the pin hole is avoided, and the service life of the piston pin and the pin hole is effectively prolonged; through the second oil return holes which are asymmetrically arranged, the positions of the second oil return holes and the engine oil nozzles correspond to each other, and the local cooling effect is enhanced.

Description

Piston capable of generating asymmetric oil return performance

Technical Field

The utility model relates to the technical field of pistons, in particular to a piston for generating asymmetric oil return performance.

Background

The piston is the "heart" of the engine, is subjected to alternating mechanical and thermal loads, and is one of the most severe operating critical components of the engine. With the development of engine technology, in environments with high thermal loads. A cold oil passage is typically provided in the piston body near the combustion chamber, in which the engine oil cools the piston body.

In the prior art, as disclosed in patent document with publication number CN202215391U, a steel piston with an oil return hole is synchronously disclosed, which comprises a piston body, wherein an inner cooling oil duct, an oil inlet duct communicated with the inner cooling oil duct and an oil outlet duct are arranged in the piston body, a small connecting rod head is also arranged in the piston body, an oil return hole is arranged in the piston body, the oil return hole is communicated with the lower part of the inner cooling oil duct, the injection end of the oil return hole faces the small connecting rod head, and an oil collecting hole is arranged on the small connecting rod head; but in the practical application process, the piston pin and the small end of the connecting rod of the piston also need to be lubricated, the existing lubrication mode adopts splash lubrication, so that the quantity of lubricating oil entering the pin hole and the small end hole of the connecting rod is small, the pin hole and the small end of the connecting rod cannot be well lubricated, and meanwhile, the symmetrical oil return holes are arranged, oil return is affected, and the cooling effect is reduced.

Disclosure of Invention

The utility model aims to provide a piston capable of generating asymmetric oil return performance, which solves the following technical problems:

the existing lubrication mode adopts splash lubrication, so that the quantity of lubrication oil entering the pin hole and the small end hole of the connecting rod is small, the pin hole and the small end of the connecting rod cannot be well lubricated, meanwhile, the symmetrical oil return holes are arranged, oil return can be affected, and the cooling effect can be reduced.

The aim of the utility model can be achieved by the following technical scheme:

a piston for generating asymmetric oil return performance comprises a piston head and a piston skirt, wherein the piston head and the piston skirt are integrally distributed to form the piston;

the piston skirt is combined with one side of the piston head to form a piston inner cavity;

pin holes for mounting piston pins are formed on two sides of the piston skirt part oppositely;

and a plurality of groups of first oil return holes are formed in the piston skirt part positioned close to the pin hole direction.

Preferably, the piston head is provided with a plurality of groups of annular grooves for installing the oil rings.

Preferably, two groups of annular grooves are formed.

Preferably, an oil return groove is formed in the connecting end of the piston head and the piston skirt.

Preferably, a plurality of groups of second oil return holes are correspondingly formed in two sides of the oil return groove.

Preferably, the second oil return holes are asymmetrically distributed in the oil return groove.

Preferably, three groups of second oil return holes are formed in one side of the oil return groove, and four groups of second oil return holes are formed in the other side of the oil return groove.

The utility model has the beneficial effects that:

(1) In the utility model, in the moving process of the piston head and the piston skirt, oil scraped by the oil ring can enter the inner cavity of the piston through the first oil return hole, and the first oil return hole is arranged on the periphery of the pin hole, so that the pin hole can be cooled, the overhigh temperature of the piston pin and the pin hole is avoided, and the service life of the piston pin and the pin hole is effectively prolonged;

(2) According to the utility model, the second oil return holes are asymmetrically arranged, so that the positions of the second oil return holes and the engine oil nozzles correspond to each other, the local cooling effect is enhanced, meanwhile, the number of the drilled holes is small, the manufacturing cost can be reduced, and the oil can flow intensively from the position with few holes to the position with more holes.

Drawings

The utility model is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic illustration of a piston of the present utility model for producing asymmetric oil return properties;

FIG. 2 is a schematic diagram of a piston of the present utility model for producing asymmetric oil return;

FIG. 3 is a schematic illustration of a piston of the present utility model that produces an asymmetric oil return.

In the figure: 1. a piston head; 2. a piston skirt; 101. an annular groove; 102. an oil return groove; 103. a second oil return hole; 104. a piston inner chamber; 201. a pin hole; 202. and a first oil return hole.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

Referring to fig. 1-2, the present utility model is a piston for generating asymmetric oil return property, comprising a piston head 1 and a piston skirt 2, wherein in one implementation of the present embodiment, the piston head 1 and the piston skirt 2 are integrally arranged to form a piston body;

wherein, the piston skirt 2 is combined with one side of the piston head 1 to form a piston inner cavity 104;

the two sides of the piston skirt 2 are provided with pin holes 201 for mounting piston pins;

a plurality of groups of first oil return holes 202 are formed in the piston skirt 2 which is positioned in the direction close to the pin holes 201; it may be noted that, in the moving process of the piston head 1 and the piston skirt 2, oil scraped by the oil ring may enter the piston inner cavity 104 through the first oil return hole 202, and since the first oil return hole 202 is arranged at the periphery of the pin hole 201, the pin hole 201 may be cooled, so that the overhigh temperature of the piston pin and the pin hole 201 is avoided, and the service life is effectively prolonged.

Example 2

On the basis of the embodiment 1, referring to fig. 3, a piston head 1 is provided with a plurality of groups of annular grooves 101 for installing oil rings; in one implementation of the present embodiment, two sets of annular grooves 101 are provided; specifically, an oil ring is embedded in the annular groove 101, so that the piston can scrape the residual oil to the side facing the piston skirt 2 again through the oil ring in the process of reciprocating movement;

as a further scheme of the embodiment, an oil return groove 102 is formed at the connecting end of the piston head 1 and the piston skirt 2, wherein a plurality of groups of second oil return holes 103 are formed at two sides of the oil return groove 102 oppositely; specifically, the oil ring scrapes the residual oil into the oil return groove 102, and then the residual oil reflows back to the piston inner cavity 104 through a second oil return hole 103 formed in the oil return groove 102;

further, the second oil return hole 103 is asymmetrically arranged in the oil return groove 102; wherein, three groups are arranged on one side of the second oil return hole 103 on the oil return groove 102, and four groups are arranged on the other side of the oil return groove 102. In this embodiment, through the second oil return holes 103 formed asymmetrically, the positions of the second oil return holes 103 and the engine oil nozzles correspond to each other, so as to enhance the local cooling effect, and meanwhile, the number of holes drilled is small, so that the manufacturing cost can be reduced, and the oil can flow from the position with few holes toward the position with more holes in a concentrated manner.

The working principle of the utility model is as follows: in the moving process of the piston head 1 and the piston skirt 2, oil scraped by the oil ring can enter the piston inner cavity 104 through the first oil return hole 202, and as the first oil return hole 202 is arranged on the periphery side of the pin hole 201, the pin hole 201 can be cooled down, and the oil ring is embedded in the annular groove 101, so that the residual oil can be scraped to one side towards the piston skirt 2 through the oil ring again in the reciprocating transfer process of the piston.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and for simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The foregoing describes one embodiment of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.

Claims (7)

1. A piston for generating asymmetric oil return performance comprises a piston head (1) and a piston skirt (2), wherein the piston head (1) and the piston skirt (2) are integrally distributed to form a piston body;

the piston is characterized in that the piston skirt (2) is closed at one side of the piston head (1) to form a piston inner cavity (104);

pin holes (201) for mounting piston pins are formed on two sides of the piston skirt (2) oppositely;

a plurality of groups of first oil return holes (202) are formed in the piston skirt (2) which is positioned in the direction close to the pin holes (201).

2. A piston for producing an asymmetrical oil return according to claim 1, characterized in that the piston head (1) is provided with several sets of annular grooves (101) for mounting oil rings.

3. A piston for producing an asymmetrical oil return according to claim 2, characterized in that the annular grooves (101) are open in two groups.

4. A piston for producing an asymmetric oil return according to claim 2, characterized in that the connecting end of the piston head (1) and the piston skirt (2) is provided with an oil return groove (102).

5. The piston for generating asymmetric oil return performance according to claim 4, wherein a plurality of sets of second oil return holes (103) are formed on two sides of the oil return groove (102) oppositely.

6. A piston for producing an asymmetrical oil return according to claim 5, characterized in that the second oil return hole (103) is arranged asymmetrically in the oil return groove (102).

7. The piston for generating asymmetric oil return according to claim 6, wherein three groups are provided on one side of the second oil return hole (103) located on the oil return groove (102), and four groups are provided on the other side of the oil return groove (102).