CN214499252U

CN214499252U - Welded steel piston

Info

Publication number: CN214499252U
Application number: CN202120718134.2U
Authority: CN
Inventors: 刘明晖; 巢涛; 杨志勇; 王奕澍; 谭小东; 李秀; 曹湘洁
Original assignee: Hunan Jiangbin Machinery Group Co Ltd
Current assignee: Hunan Jiangbin Machinery Group Co Ltd
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-10-26
Anticipated expiration: 2031-04-08

Abstract

The utility model discloses a welded steel piston, including piston head and piston skirt portion, the first welding seam of piston head with piston skirt portion locates between combustion chamber and oil pocket, the second welding seam of piston head with piston skirt portion locates between oil pocket and piston excircle, the piston head is equipped with the position ring platform that is used for fixing a position the outer peripheral face of piston skirt portion; according to the piston welding device, the welding position of the head part and the skirt part of the piston is changed into the position between the combustion chamber and the oil cavity, the high-temperature area of the piston is avoided, the technical problem that the piston is cracked and failed due to the concentrated welding stress is effectively solved, the processing difficulty before assembly is reduced, the welding is easy, the second welding seam is arranged between the oil cavity and the outer circle of the piston, and the positioning ring platform is arranged at the matching position of the head part of the piston and the skirt part of the piston, so that the assembly precision and the welding precision are further improved.

Description

Welded steel piston

Technical Field

The utility model relates to an engine steel piston production technical field especially relates to a welding steel piston.

Background

With the continuous improvement of the strengthening degree of the diesel engine, the explosion pressure can reach 25MPa to the maximum, and the traditional aluminum alloy piston can only bear the explosion pressure of 18MPa at the maximum and cannot meet the use requirement, so the aluminum alloy piston is gradually replaced by a forged steel piston with higher pressure-bearing strength.

Currently, there are two main types of forged steel pistons on the market: as shown in figure 1, a piston body and a ring part of a first forged steel piston are processed by laser welding, a top welding seam 01 is positioned between an oil passage and a top surface, and the top welding seam is arranged at a high-temperature position of the piston, so that stress concentration is easy to generate and cracking is easy to occur; as shown in figure 2, a top welding seam 01 of the second forged steel piston is also arranged between an oil passage and the top surface, stress concentration and cracking are easily caused, in addition, the cooling oil cavity in the integrated piston is formed by machining through a hook-shaped cutter, the process cost is high, and the manufacturing period is long.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a welded steel piston, its simple process, the machining precision is high, and intensity is good, and oil pocket cooling effect is good.

In order to achieve the above object, the utility model provides a welded steel piston, including piston head and piston skirt portion, the piston head with the first welding seam of piston skirt portion is located between combustion chamber and the oil pocket, the piston head with the second welding seam of piston skirt portion is located between oil pocket and the piston excircle, the piston head is equipped with and is used for fixing a position the position ring platform of piston skirt portion outer peripheral face.

Preferably, the second weld is horizontally disposed.

Preferably, the first and second welds are laser or electron beam welds.

Preferably, the outer peripheral surface of the piston head is provided with a calibration groove for positioning the second weld joint.

Preferably, the calibration groove is an annular groove having a V-shaped longitudinal section.

Preferably, the locating land has an interference fit with the piston skirt.

Compared with the prior art, the utility model provides a welded steel piston, welded first welding seam is located between combustion chamber and the oil pocket between piston head and the piston skirt portion, and the second welding seam is located between oil pocket and the piston excircle, has reduced the processing degree of difficulty before the assembly, easily welds, and oil duct cooling effect is better, and meanwhile, the piston high temperature region has been avoided to the welding seam, prevents that piston welding stress from concentrating and the fracture is inefficacy. In addition, the piston head is provided with a positioning ring table, the outer circle of the skirt part of the piston assembled with the positioning ring table is positioned and clamped tightly, the assembling efficiency and the welding precision are improved, the installation is firmer, and the welding quality is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described 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.

FIGS. 1 and 2 are cross-sectional views of a prior art forged steel piston;

FIG. 3 is a cross-sectional view of a welded steel piston provided by the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a cross-sectional view of the piston head of FIG. 3;

FIG. 6 is a cross-sectional view of the piston skirt of FIG. 3;

the piston comprises a piston head 1, a piston skirt 2, a combustion chamber 3, an oil chamber 4, a piston excircle 5, a positioning ring platform 6, a first welding line 7, a second welding line 8 and a calibration groove 9.

Detailed Description

The core of the utility model is to provide a welding steel piston, this piston machining precision is high, of high quality, can realize the assembly of piston head 1 and skirt portion 2 smoothly and the quality testing of welding and welding seam.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 3 to 6, fig. 3 is a cross-sectional view of a welded steel piston according to the present invention; FIG. 4 is an enlarged view of a portion of FIG. 3; FIG. 5 is a cross-sectional view of the piston head of FIG. 3;

fig. 6 is a cross-sectional view of the piston skirt of fig. 3.

The utility model provides a welded steel piston, including piston head 1 and piston skirt portion 2, as shown in fig. 5 and fig. 6, piston head 1 locates between combustion chamber 3 and oil pocket 4 with the first welding seam 7 of piston skirt portion 2, as shown in fig. 3, specifically, two first welding seams 7 are located respectively on two chamber arms of being connected between combustion chamber 3 and the oil pocket 4, piston head 1 is equipped with the position ring platform 6, this position ring platform 6 sets up in the bottom edge and the circumferential direction distribution of piston head 1, the inner peripheral surface and the outer peripheral surface of position ring platform 6 are vertical and smooth cambered surface, the vertical inner peripheral surface of position ring platform 6 is first cooperation terminal surface, the top cooperation face of position ring platform 6 and piston skirt portion 2 is the second cooperation terminal surface, the top terminal surface of piston skirt portion 2 is the plane, piston skirt portion 2 leans on tight assembly to the second cooperation terminal surface; during welding, a second weld 8 is formed on the joint surface between the second mating end surface of the retainer ring 6 and the top of the skirt 2, as shown in fig. 4. After the piston head 1 is assembled with the piston skirt 2, welding is carried out along the positions of a first welding line 7 and a second welding line 8 of the piston.

This scheme has improved two welding seam positions that traditional piston head 1 and piston skirt portion 2 are connected, sets up between combustion chamber 3 and oil pocket 4 and between oil pocket 4 and piston excircle 5, has avoided the piston high temperature region, can improve the condition that welding stress concentrates and the fracture became invalid, and the cooling effect is better, has reduced the processing degree of difficulty before the assembly. In addition, the piston head 1 is from the locating ring platform 6 that takes the effect of location, hug closely, and when piston head 1 and piston skirt portion 2 assembled, play from the locate function, rise under the high temperature and tightly install, make things convenient for follow-up welding process.

Preferably, the second welding line 8 is horizontally arranged, so that horizontal calibration and welding processing are facilitated, and the processing efficiency and the processing precision are improved.

In a preferred embodiment, the positioning ring platform 6 is in interference fit with the piston skirt 2, the interference magnitude can be set according to actual requirements, but the positioning ring platform 6 is ensured to be in tight fit with the piston skirt 2 so as to adjust manual assembly errors and improve assembly accuracy; under high temperature, the positioning ring platform 6 and the piston skirt 2 are expanded by high temperature, the positioning precision is higher, and the welding quality is better.

First welding seam 7 and second welding seam 8 between piston head 1 and the piston skirt portion 2 preferably adopt laser welding or electron beam welding processing, can avoid the formation of overlap in the oil duct and the not good problem of oil duct coolant filling effect that leads to from this in traditional friction welding course of working from this, improve the forming structure of oil duct inner path and the filling effect of oil duct coolant, further promote welding accuracy.

On the basis of the above embodiment, further, can set up the calibration groove 9 that is used for fixing a position second welding seam 8 in the outer peripheral face of piston head 1, refer to fig. 4, this calibration groove 9 is the cell body that the circumference distributes, calibration groove 9 sets up on same water flat line with second welding seam 8, horizontal calibration when making things convenient for the welding, guarantee the reliability of piston head 1 and the assembly of piston skirt portion 2 simultaneously, can weld calibration adjustment, tracking to second welding seam 8, improve the assembly precision of position collar platform 6 simultaneously.

The structure of the calibration groove 9 may be various, and is preferably an annular groove with a V-shaped longitudinal section, and the annular line where the V-shaped tip of the calibration groove 9 is located is used as the reference line of the second weld 8, so as to improve the machining accuracy of the second weld 8.

It should be noted that, in the description of the present invention, the directions or positional relationships indicated by "upper and lower" and "top and bottom" are the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the present invention, and the elements or portions indicated by the drawings are not limited to have a specific direction, and thus, the present invention is not limited thereto. Furthermore, in the present specification, relational terms such as first and second, and the like may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

It is right above that the utility model provides a welding steel piston has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The utility model provides a welding steel piston, includes piston head (1) and piston skirt portion (2), its characterized in that, piston head (1) with combustion chamber (3) and oil pocket (4) are located to first welding seam (7) of piston skirt portion (2) between, piston head (1) with second welding seam (8) of piston skirt portion (2) are located between oil pocket (4) and piston excircle (5), piston head (1) is equipped with and is used for the location locating ring platform (6) of piston skirt portion (2) outer peripheral face.

2. A welded steel piston according to claim 1, characterized in that the second weld seam (8) is arranged horizontally.

3. A welded steel piston according to claim 2, wherein the first weld seam (7) and the second weld seam (8) are both laser weld seams or electron beam weld seams.

4. A welded steel piston according to any of claims 1 to 3, characterized in that the outer circumferential surface of the piston head (1) is provided with a calibration groove (9) for positioning the second weld seam (8).

5. A welded steel piston according to claim 4, characterized in that the calibration groove (9) is an annular groove with a V-shaped longitudinal section.

6. The welded steel piston of claim 1, wherein the locating land (6) is an interference fit with the piston skirt (2).