CN219974642U

CN219974642U - Piston with concave-convex composite curve on surface

Info

Publication number: CN219974642U
Application number: CN202321426913.0U
Authority: CN
Inventors: 汪扬平; 黄魏楼; 王强
Original assignee: Anqing Art TP Pistons Co Ltd
Current assignee: Anqing Art TP Pistons Co Ltd
Priority date: 2023-06-06
Filing date: 2023-06-06
Publication date: 2023-11-07
Anticipated expiration: 2033-06-06

Abstract

The utility model discloses a piston with a concave-convex compound curve surface, and relates to the technical field of pistons, comprising a piston head and a piston skirt, wherein the piston head and the piston skirt are integrally distributed to form a 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; wherein the piston skirt curves are distributed in a concave-convex composite mode; the head of the piston is provided with a plurality of groups of annular grooves for installing oil rings; according to the utility model, the oil ring is embedded in the annular groove, so that the residual oil can be scraped to one side facing the skirt part of the piston again through the oil ring in the process of reciprocating movement of the piston, and the piston can be reused; through the piston skirt that is unsmooth compound curve and lays, through the test, this kind of piston design can effectively reduce and strike kinetic energy and kinetic energy loss rate, and then can improve engine NVH performance.

Description

Piston with concave-convex composite curve on surface

Technical Field

The utility model relates to the technical field of pistons, in particular to a piston with a concave-convex compound curve surface.

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; however, in practical application, the skirt portion of the piston body in the prior art is generally parabolic, and in the testing process, the kinetic energy loss rate is relatively high, and the NVH performance of the engine is reduced.

Disclosure of Invention

The utility model aims to provide a piston with a concave-convex compound curve on the surface, which solves the following technical problems:

the existing parabolic design has large kinetic energy loss rate of the skirt part of the piston body, and simultaneously the NVH performance of the engine is reduced.

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

the piston with the concave-convex compound curve 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;

wherein the piston skirt curve is of a concave-convex structure;

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

Preferably, the concave-convex structure is a concave-convex compound curve.

Preferably, the concave-convex compound curve comprises a plurality of groups of concave parts and convex parts which are connected.

Preferably, an oil return groove is formed in the side, facing the piston skirt, of the piston head.

Preferably, the oil return groove is provided with a plurality of groups of oil return holes communicated with the inner cavity of the piston.

Preferably, the oil return holes are distributed in the oil return groove in a circumferential array.

Preferably, two groups of annular grooves are formed.

The utility model has the beneficial effects that:

(1) According to the utility model, the oil ring is embedded in the annular groove, so that the residual oil can be scraped to one side facing the skirt part of the piston again through the oil ring in the process of reciprocating movement of the piston, and the piston can be reused; through the piston skirt arranged in the concave-convex compound curve, through tests, the piston design can effectively reduce the knocking kinetic energy and the kinetic energy loss rate, and further can improve the NVH performance of the engine;

(2) In the utility model, in the moving process of the piston head and the piston skirt, oil scraped by the oil ring firstly enters the oil return groove and then can enter the inner cavity of the piston through the oil return hole for reuse.

Drawings

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

FIG. 1 is a schematic diagram of a piston with a concave-convex surface in accordance with the present utility model;

FIG. 2 is a schematic diagram II of a piston with a concave-convex surface;

fig. 3 is a schematic diagram of a piston with a concave-convex surface.

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

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 with concave-convex compound curves, which comprises 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;

wherein, the piston skirt 2 is combined with one side of the piston head 1 to form a piston inner cavity 202; pin holes 201 for mounting piston pins are oppositely formed on two sides of the piston skirt 2

The piston skirt 2 has a concave-convex structure; the concave-convex structure is a concave-convex compound curve; the concave-convex compound curve comprises a plurality of groups of concave parts and convex parts which are connected

The piston head 1 is provided with a plurality of groups of annular grooves 101 for installing oil rings, and in one implementation mode of the embodiment, the annular grooves 101 are distributed on the piston head 1 in a circumferential array; specifically, by embedding the oil ring in the annular groove 101, the remaining oil can be scraped to the side facing the piston skirt 2 again through the oil ring in the process of reciprocating movement of the piston so as to be reused; according to the embodiment, through the piston skirt 2 distributed in the concave-convex compound curve, through tests, the piston design can effectively reduce the knocking kinetic energy and the kinetic energy loss rate, and further can improve the NVH performance of the engine.

Example 2

Referring to fig. 3, on the basis of embodiment 1; specifically, an oil return groove 103 is formed on one side of the piston head 1, which is close to the piston skirt 2, and a plurality of groups of oil return holes 102 communicated with the piston inner cavity 202 are formed in the oil return groove 103; it may be noted that, during the movement of the piston head 1 and the piston skirt 2, the oil scraped by the oil ring first enters the oil return groove 103, and then can enter the piston inner cavity 202 through the oil return hole 102 for reuse;

as a further aspect of this embodiment, the oil return holes 102 are arranged in a circumferential array in the oil return groove 103.

In the present embodiment, the annular grooves 101 are provided in two groups.

The working principle of the utility model is as follows: by embedding the oil ring in the annular groove 101, the remaining oil can be scraped to the side facing the piston skirt 2 again by the oil ring during the reciprocating movement of the piston, firstly enters the oil return groove 103, and then can enter the piston inner cavity 202 through the oil return hole 102 for reuse.

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

1. The piston with the concave-convex compound curve 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 the piston;

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

wherein the piston skirt (2) is of a concave-convex structure;

the piston head (1) is provided with a plurality of groups of annular grooves (101) for installing oil rings.

2. The piston of claim 1 wherein said concave-convex structure is a concave-convex compound curve.

3. The piston of claim 2, wherein the concave-convex compound curve comprises a plurality of sets of connected concave and convex portions.

4. A piston with a compound curve with concave-convex surface according to claim 1, characterized in that an oil return groove (103) is provided on the side of the piston head (1) facing the piston skirt (2).

5. The piston with the concave-convex surface compound curve according to claim 4, wherein the oil return groove (103) is provided with a plurality of groups of oil return holes (102) communicated with the inner cavity (202) of the piston.

6. The piston of a surface relief compound curve according to claim 5, characterized in that the oil return holes (102) are arranged in a circumferential array in the oil return groove (103).

7. A piston with a compound curve with concave-convex surface according to claim 1, characterized in that the annular grooves (101) are provided with two groups.