CN-121993327-A - Structure of forged oil rail and manufacturing method thereof

Abstract

The invention relates to a forged oil rail structure and a manufacturing method thereof. The structure of the forging oil rail is provided with a plurality of pressure-bearing seats, the main body of the forging oil rail is assembled with the pressure-bearing seats, and the main body of the forging oil rail is tightly connected with the pressure-bearing seats in a brazing mode. The invention has the advantages of simple structure, high cost performance, good reliability and the like, and completely solves the problem that the forged oil rail body is torn when the fluid stress exceeds the yield strength of the material base metal.

Inventors

• ZHENG FENG
• HU ZIBIN

Assignees

• 赛沃智造(上海)科技有限公司

Dates

Publication Date

20260508

Application Date

20241108

Claims (7)

1. 1. A structure of a forged oil rail is characterized in that a plurality of bearing seats are arranged, a main body of the forged oil rail is assembled with the bearing seats, and the main body of the forged oil rail is tightly connected with the bearing seats in a brazing mode.
2. 2. The structure of the forged oil rail according to claim 1, wherein the assembly positioning mode between the main body of the forged oil rail and the pressure-bearing seat is press-fitting positioning or laser welding spot welding positioning.
3. 3. The structure of a forged oil rail according to claim 1, wherein the surface of the pressure-bearing seat is brazed by copper plating, and the pressure-bearing seat is connected with the body of the forged oil rail.
4. 4. The structure of the forged oil rail according to claim 1, wherein the material of the pressure-bearing seat is selected to change the crystal lattice due to mechanical material mechanics, and after brazing, the material returns to the original material mechanics of the base material, and the pressure-bearing seat is made of a material having a higher yield strength than the main body of the forged oil rail, so as to resist the higher stress pressure, thereby realizing the reliability and durability of the design.
5. 5. The structure of the forged oil rail according to claim 1, wherein the bearing seat is structured by stepped sectional bearing, and the structure is large at the side close to the main oil gallery and small at the lower side of the structure.
6. 6. A method for manufacturing a forged oil rail structure according to claim 1, 2, 3, 4 or 5, wherein the bearing seat is pre-positioned on a tool, the bearing seat is initially positioned and aligned by a prosthesis, the bearing seat is adsorbed in a vacuum mode, the forged oil rail is fixed on the tool, a clamping mechanism is started, an oil cylinder clamps the oil rail, and the bearing seat is pressed into an oil through hole of the forged oil rail after the starting.
7. 7. The method of manufacturing a forged rail structure according to claim 6, further comprising brazing the surface of the pressure-receiving base with copper plating to connect the pressure-receiving base with the forged rail body.

Description

Structure of forged oil rail and manufacturing method thereof Technical Field The invention relates to an oil rail and a manufacturing method thereof, in particular to a structure of a forged oil rail and a manufacturing method thereof. Background In the current gasoline rail manufacturing link, along with the increasing severity of emission standards, the pressure of fuel rail injection is required to be higher and higher. In order to meet the emission requirements, the oil rail design is changed from an assembled brazing type oil rail to an integral forging oil rail, and CNC processing equipment is needed to finish the production and manufacture of the forging oil rail. The more contradictory internal stresses of the product are highlighted in the face of higher and higher injection pressures. Referring to fig. 1-3, the present invention is directed to CAE analysis of conventional forged oil rails. From the analysis of fig. 1 and 2, it can be concluded that when the diameter of the main oil gallery is fixed, the larger the diameter of the radial flow passage, the smaller the axial stress, and the less likely the material base material will tear under the same conditions. The stress concentration occurs at the radial runner mouth. From the analysis of fig. 2 and 3, it can be concluded that when the diameter of the radial flow passage is fixed, the smaller the diameter of the main oil gallery, the smaller the axial stress, and the less likely the material base material will tear under the same conditions. The stress concentration occurs at the radial runner mouth. However, the design boundary of the customer, namely the radial runner, has the function of the runner, and on the other hand, has the function of the installation and fixation constraint of the fuel injector or the bracket block and the like, and the diameter of the radial runner cannot be infinitely expanded and increased. The design of the main oil duct also limits that the diameter of the main oil duct cannot be designed to be too small because the pressure fluctuation of the whole system is affected, so that when the fluid stress exceeds the yield strength of the material base metal, the tearing result of the forged oil rail body becomes a necessary result. In summary, according to the CAE analysis result, the conclusion is that the smaller the designed diameter of the main oil gallery is, the larger the diameter of the sub-runner is, the smaller the stress pressure is, and the more the stress concentration is improved under the condition that the design boundary allows. The stress concentration occurs at the mouth position of the radial flow diversion channel. Disclosure of Invention The invention aims to provide a structure of a forged oil rail and a manufacturing method thereof, which mainly solve the technical problems in the prior art, and the invention has the advantages of simple structure, high cost performance, good reliability and the like, and completely solves the problem that the forged oil rail body is torn when the fluid stress exceeds the yield strength of a material base metal. In order to solve the technical problems, the invention is realized as follows: A structure of a forged oil rail is characterized in that a plurality of bearing seats are arranged, a main body of the forged oil rail is assembled with the bearing seats, and the main body of the forged oil rail is tightly connected with the bearing seats in a brazing mode. The structure of the forged oil rail is characterized in that the assembly positioning mode between the main body of the forged oil rail and the pressure-bearing seat is press-fit positioning or laser welding spot welding positioning. The structure of the forged oil rail is characterized in that the surface of the pressure-bearing seat is brazed in a copper plating mode, and the pressure-bearing seat is connected with the main body of the forged oil rail. The structure of the forged oil rail is characterized in that in the aspect of material selection of the pressure-bearing seat, due to mechanical material mechanics, crystal lattices are changed, after brazing, the material can restore to the material mechanical property of an original parent metal, and the pressure-bearing seat is made of a material with higher yield strength relative to the main body of the forged oil rail, so that higher stress pressure is resisted, and the reliability and durability of design are realized. The structure of the forged oil rail is characterized in that the structure of the pressure bearing seat adopts a stepped sectional pressure bearing structure, the structure is large below the structure and large at the side close to the main oil duct. A manufacturing method of the forged oil rail structure is characterized in that a pressure bearing seat is pre-positioned on a tool, the pressure bearing seat is initially positioned and aligned by a prosthesis, the pressure bearing seat is adsorbed in a vacuum mode, meanwhile, t