High pressure carbon steel fuel oil distribution pipe

Abstract

This utility model provides a high-pressure carbon steel fuel distribution pipe, including a main pipe, a fuel inlet seat, an injector seat, and a mounting bracket. The main pipe has several fuel inlets on its wall. The injector seat is welded to the first interface of the fuel inlet seat, and the second interface of the fuel inlet seat corresponds to the fuel inlets and is welded to the main pipe wall. The fuel inlet seat and the mounting bracket are separately manufactured independent components. The mounting bracket is welded to the main pipe wall. This utility model solves the problems of high cost and complex manufacturing process caused by the existing technology of "integral forging of the fuel inlet seat and mounting bracket".

Description

Technical Field

[0001] This utility model relates to the technical field of gasoline vehicle engine components, and in particular to a high-pressure carbon steel fuel distribution pipe. Background Technology

[0002] The high-pressure fuel rail (i.e., high-pressure fuel distribution pipe) of a gasoline engine delivers fuel to each injector at a constant high pressure to achieve complete combustion. In existing technologies, for structures where the fuel inlet seat and mounting bracket are located close to each other, a process of integral forging of the fuel inlet seat and mounting bracket is often used: that is, the fuel inlet seat and mounting bracket are integrated into a single component through a single forging process, and then fixed to the main pipe. However, this process has significant drawbacks: integral forging requires customized complex molds to adapt to the different structural requirements of the fuel inlet seat and mounting bracket, resulting in high mold costs; the material must simultaneously meet the strength requirements of both during forging, leading to low material utilization (scrap exceeding 40%); and the subsequent processing of the integral component is difficult, requiring precision machining of the fuel inlet seat interface and the mounting bracket fixing surface separately, further increasing process costs.

[0003] Therefore, how to solve the problems of high cost and complex process caused by the "integrated forging of oil passage seat and mounting bracket" in the existing technology has become a technical problem that needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a high-pressure carbon steel fuel distribution pipe, which mainly solves the problems of high cost and complex process caused by the "integrated forging of fuel seat and mounting bracket" in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a high-pressure carbon steel fuel distribution pipe, characterized in that: the high-pressure carbon steel fuel distribution pipe includes a main pipe, a fuel inlet seat, an injector seat, and a mounting bracket; the main pipe has several fuel inlets on its wall; the injector seat is fixed to the first interface of the fuel inlet seat by welding; the second interface of the fuel inlet seat corresponds to the fuel inlets and is fixed to the main pipe wall by welding; the fuel inlet seat and the mounting bracket are independently manufactured components; the mounting bracket is fixed to the main pipe wall by welding.

[0006] Furthermore, the high-pressure carbon steel fuel distribution pipe also includes an inlet pipe connector, a sensor connector, and a wiring harness bracket. The sensor connector corresponds to the oil passage hole and is fixed to the pipe wall of the main pipe by welding.

[0007] The oil inlet pipe joint is fixed to the second end of the main pipe by welding.

[0008] The wire harness bracket is fixed to the wall of the main pipe by welding.

[0009] Furthermore, the connections between the oil inlet pipe joint, sensor joint, wiring harness bracket, mounting bracket, oil passage seat, and injector seat and the main pipe are all sealed and reinforced using a high-temperature brazing process, which employs copper paste high-temperature brazing.

[0010] Furthermore, the oil passage seat has a recessed first clearance area on the side facing away from the main pipe; the mounting bracket has a recessed second clearance area on the side facing away from the main pipe.

[0011] Furthermore, the main pipe is a carbon steel pipe manufactured through hot rolling and gun drilling processes.

[0012] Furthermore, the wire harness bracket includes a connecting part for connecting to the main pipe wall and a wire harness hole part for fixing the wire harness, and a reinforcing rib is provided between the connecting part and the wire harness hole part.

[0013] Furthermore, the first end of the main tube and the end cap are fixed by high-temperature brazing using oxygen-free copper rings;

[0014] The injector seat and the fuel supply seat are fixed together by a second oxygen-free copper ring using high-temperature brazing.

[0015] The second end of the main pipe and the oil inlet pipe joint are fixed by high-temperature brazing with oxygen-free copper rings.

[0016] In view of the above technical features, the present invention has the following beneficial effects:

[0017] 1. This utility model discloses a high-pressure carbon steel fuel distribution pipe, which solves the problems of high cost and complex process caused by the existing technology of "integrated forging of fuel seat and mounting bracket" by making the fuel inlet seat and mounting bracket as separate independent components, and then welding the fuel inlet seat and mounting bracket to the main pipe respectively, thereby reducing the production threshold and cost and improving product performance.

[0018] 2. The present invention relates to a high-pressure carbon steel fuel distribution pipe, wherein a reinforcing rib is provided between the connecting part and the wire harness hole part of the wire harness bracket. The reinforcing rib can increase the connection strength between the connecting part and the wire harness hole part, making the position of the wire harness hole part more stable and providing better wire harness fixing effect.

[0019] 3. This utility model discloses a high-pressure carbon steel fuel distribution pipe, wherein the fuel inlet seat has a recessed first clearance area on the side facing away from the main pipe; and the mounting bracket has a recessed second clearance area on the side facing away from the main pipe. Within the limited space of an engine, which contains many other components, the first and second clearance areas help the high-pressure carbon steel fuel distribution pipe avoid conflict with other components. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a high-pressure carbon steel fuel distribution pipe in specific embodiment 1. Figure 1 (3D perspective);

[0021] Figure 2 This is a schematic diagram of the structure of a high-pressure carbon steel fuel distribution pipe in specific embodiment 1. Figure 2 (Main view perspective);

[0022] Figure 3 This is a schematic diagram of the structure of a high-pressure carbon steel fuel distribution pipe in specific embodiment 1. Figure 3 (Cross-sectional view perspective);

[0023] Figure 4 This is a schematic diagram of the structure of a high-pressure carbon steel fuel distribution pipe in specific embodiment 1. Figure 1 (3D perspective);

[0024] Figure 5 This is a schematic diagram of the structure of a high-pressure carbon steel fuel distribution pipe in specific embodiment 1. Figure 2 (Main view perspective);

[0025] Figure 6 The figure shows a schematic diagram of the structure of a high-pressure carbon steel fuel distribution pipe in specific embodiment 1. Figure 3 (Side view perspective)

[0026] In the diagram: 100, main pipe; 101, first end of the main pipe; 102, second end of the main pipe; 103, sensor connector interface; 104, oil passage hole;

[0027] 110. Sensor connector; 120. Oil inlet pipe connector; 130. End cap; 140. First oxygen-free copper ring for connecting the end cap and the first end of the main pipe; 150. Wiring harness bracket; 160. Oil passage seat; 170. Mounting bracket; 180. Injector seat; 190. Second oxygen-free copper ring for connecting the injector seat and the oil passage seat; 200. Third oxygen-free copper ring for connecting the injector seat and the oil inlet pipe connector;

[0028] 151. Connecting part; 152. Cable harness hole; 153. Reinforcing rib;

[0029] 161. Injector interface; 162. Fuel port interface; 163. First clearance zone;

[0030] 171. Mounting bracket interface; 172. Second clearance zone; 181. Injector seat interface. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0032] See Figures 1 to 3 Specific embodiment 1: This embodiment 1 provides a high-pressure carbon steel fuel distribution pipe, including a main pipe 100, an inlet pipe connector 120, a sensor connector 110, a wiring harness bracket 150, a mounting bracket 170, a fuel inlet seat 160, and an injector seat 180. The main pipe 100 has several fuel inlet holes 104 on its wall. The injector seat 180 is fixed to the injector interface 161 of the fuel inlet seat 160 by welding. At this time, the injector interface 181 of the injector seat 180... The injector interface 161 of the fuel port 160 corresponds to the fuel port 162 of the fuel port 160, which corresponds to the fuel port 104 (e.g., the fuel port 104 on the main pipe 100 corresponding to the fuel port 160) and is fixed to the pipe wall of the main pipe 100 by welding. The injector interface 161 and the fuel port interface 162 of the fuel port 160 are connected to form a fuel flow channel in the fuel port 160. The fuel port 160 and the mounting bracket 170 are independently manufactured components. The sensor connector 110 is fixed to the pipe wall of the main pipe 100 by welding, corresponding to the oil passage hole 104 (e.g., the oil passage hole 104 on the main pipe 100 corresponding to the sensor connector 110, which can also be called "sensor connector interface 103"). The oil inlet pipe connector 120 is fixed to the second end 102 of the main pipe by welding. The mounting bracket 170 and the wire harness bracket 150 are both fixed to the pipe wall of the main pipe 100 by welding. For example, the mounting bracket 170 corresponds to the mounting bracket interface 171 on the main pipe 100, and the mounting bracket interface 171 is welded to the pipe wall of the main pipe. The connections between the oil inlet pipe connector 120, the sensor connector 110, the wire harness bracket 150, the mounting bracket 170, the oil passage seat 160, and the injector seat 180 and the main pipe 100 are sealed and reinforced by high-temperature brazing, which uses copper paste high-temperature brazing.

[0033] The fuel filler seat 160 has a recessed first clearance area 163 on the side facing away from the main pipe 100; the mounting bracket 170 has a recessed second clearance area 172 on the side facing away from the main pipe 100. Within the limited space of the engine, there are many other components, and the first clearance area 163 and the second clearance area 172 help the high-pressure carbon steel fuel distribution pipe avoid conflict with other components.

[0034] The main pipe 100 is a hot-rolled carbon steel pipe made by gun drilling. It is made by first hot rolling to form a cylindrical pipe, and then using a gun drill to process the inner hole and oil passage hole to form a carbon steel pipe.

[0035] The wire harness bracket 150 includes a connecting part 151 for connecting to the wall of the main pipe 100 and a wire harness hole part 152 for fixing the wire harness. A reinforcing rib 153 is provided between the connecting part 151 and the wire harness hole part 152. The reinforcing rib 153 can increase the connection strength between the connecting part 151 and the wire harness hole part 152, making the position of the wire harness hole part 152 more stable and providing better wire harness fixing.

[0036] The first end 101 of the main pipe and the end cap 130 are fixed by high-temperature brazing using a first oxygen-free copper ring 140; the injector seat 180 and the fuel inlet seat 160 are fixed by high-temperature brazing using a second oxygen-free copper ring 190; the second end 102 of the main pipe and the fuel inlet connector 120 are fixed by high-temperature brazing using a third oxygen-free copper ring 200. For example, the end cap 130 can be fixed to the first end 101 of the main pipe by press-fitting. During press-fitting, the first oxygen-free copper ring 140 is first fitted onto the end cap 130, and then the end cap 130 is pressed into the first end 101 of the main pipe to complete the press-fitting fixation. Similarly, the fuel inlet connector 120 can be fixed to the second end 102 of the main pipe by press-fitting. During press-fitting, the third oxygen-free copper ring 200 is first fitted onto the fuel inlet connector 120, and then the fuel inlet connector 120 is pressed into the second end 102 of the main pipe to complete the press-fitting fixation.

[0037] The oil passage seat 160 is made separately using precision casting technology to meet the fixing requirements of the injector seat 180; the mounting bracket 170 is made separately using stamping technology to meet the installation and fixing function; after the two are made separately, they are fixed to the corresponding positions of the main pipe 100 by welding, replacing the integral forged structure.

[0038] The oil inlet pipe connector 120 and end cap 130 are fixed to the end of the main pipe 100 by "pre-fitting oxygen-free copper rings + press fitting", reducing machining; the sensor connector 110 and wire harness bracket 150 are fixed to the pipe wall of the main pipe 100 by welding, which disperses the process and reduces equipment dependence.

[0039] The high-temperature brazing process is copper paste high-temperature brazing, which reinforces the connection joints between the oil inlet seat 160, mounting bracket 170, oil inlet pipe joint 120 and the main pipe 100 to ensure high-pressure sealing.

[0040] The core improvement in this embodiment 1 lies in the "separate design of the oil passage seat 160 and the mounting bracket 170", and its manufacturing process is as follows:

[0041] Step 1: Make each component independently

[0042] Main pipe 100: It is made of hot-rolled carbon steel pipe with gun drilling and is formed by gun drilling process. The pipe wall is reserved with corresponding oil passage holes 104 for connecting the oil passage seat interface 162 and corresponding oil passage holes 104 for connecting the sensor connector interface 103.

[0043] Oil passage seat 160: Separate precision casting, with reserved injector interface 161 and oil passage seat interface 162;

[0044] Mounting bracket 170: Individually stamped to fit installation dimensions;

[0045] Other components (oil inlet pipe connector 120, sensor connector 110, etc.) are manufactured separately according to conventional processes.

[0046] Step 2: Component fixing

[0047] The injector housing 180 is welded to the injector interface 161 (a second oxygen-free copper ring 190 is fitted before welding);

[0048] The oil inlet pipe connector 120 and end cap 130 are fixed to both ends of the main pipe 100 by "pre-fitting oxygen-free copper rings + press fitting";

[0049] The oil passage seat 160 is welded to the corresponding oil passage hole 104 reserved in the main pipe 100 for connecting the oil passage seat interface 162;

[0050] Mounting bracket 170 is independently welded to the mounting position on the wall of main pipe 100 (separately fixed from oil passage seat 160);

[0051] The sensor connector 110 and the wire harness bracket 150 are welded to the corresponding oil passage hole 104 and pipe wall of the main pipe 100.

[0052] Step 3: Sealing and Reinforcement

[0053] The oil inlet seat 160, mounting bracket 170, oil inlet pipe joint 120, sensor joint 110 and main pipe 100 are sealed and reinforced by high-temperature copper paste brazing process to ensure sealing performance under high pressure.

[0054] The high-pressure carbon steel fuel distribution pipe in this embodiment 1 has the following advantages compared with the existing "fuel seat 160 and mounting bracket 170 integrally forged" solution:

[0055] 1. Reduced mold costs: The oil passage seat 160 and the mounting bracket 170 are manufactured separately, eliminating the need for a customized complex integral forging mold, thus reducing mold costs by 70%;

[0056] 2. Improve material utilization: The oil passage seat 160 is made by casting (material utilization rate 80%) and the mounting bracket 170 is made by stamping (material utilization rate 90%), replacing the one-piece forging (material utilization rate ≤60%), reducing material waste by more than 40%.

[0057] 3. Simplified process flow: Avoiding complex subsequent processing of integrated parts, the oil passage seat 160 and mounting bracket 170 can be optimized according to functional requirements, improving processing efficiency by 50%;

[0058] 4. Ensure product quality: Separate welding + high-temperature brazing reduces potential internal defects from one-piece forging, improves connection sealing, and increases product qualification rate from 82% to 97%.

[0059] In summary, in this embodiment 1, the separate design of the oil passage seat 160 and the mounting bracket 170 (i.e., the oil passage seat 160 and the mounting bracket 170 are two independent components) ensures the performance of the high-pressure oil rail while significantly reducing the manufacturing cost, making it highly practical and suitable for mass production.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A high-pressure carbon steel fuel distribution pipe, characterized in that: The high-pressure carbon steel fuel distribution pipe includes a main pipe (100), a fuel inlet seat (160), an injector seat (180), and a mounting bracket (170). The main pipe (100) has several fuel inlets (104) on its wall. The injector seat (180) is fixed to the injector interface (161) of the fuel inlet seat (160) by welding. The fuel inlet interface (162) of the fuel inlet seat (160) corresponds to the fuel inlets (104) and is fixed to the wall of the main pipe (100) by welding. The fuel inlet seat (160) and the mounting bracket (170) are independently manufactured components. The mounting bracket (170) is fixed to the wall of the main pipe (100) by welding.

2. The high-pressure carbon steel fuel distribution pipe according to claim 1, characterized in that: The high-pressure carbon steel fuel distribution pipe also includes an inlet pipe connector (120), a sensor connector (110), and a wiring harness bracket (150). The sensor connector (110) corresponds to the oil passage hole (104) and is fixed to the pipe wall of the main pipe (100) by welding. The oil inlet pipe joint (120) is fixed to the second end (102) of the main pipe (100) by welding; The wire harness bracket (150) is fixed to the wall of the main pipe (100) by welding.

3. The high-pressure carbon steel fuel distribution pipe according to claim 2, characterized in that: The connections of the oil inlet pipe connector (120), sensor connector (110), wiring harness bracket (150), mounting bracket (170), oil passage seat (160), and injector seat (180) to the main pipe (100) are all sealed and reinforced by high-temperature brazing process, which uses copper paste high-temperature brazing.

4. A high-pressure carbon steel fuel distribution pipe according to claim 2 or 3, characterized in that: The oil passage seat (160) has a recessed first clearance area (163) on the side facing away from the main pipe (100); the mounting bracket (170) has a recessed second clearance area (172) on the side facing away from the main pipe (100).

5. The high-pressure carbon steel fuel distribution pipe according to claim 4, characterized in that: The main pipe (100) is a carbon steel pipe made by hot rolling and gun drilling.

6. A high-pressure carbon steel fuel distribution pipe according to claim 1, 2, 3, or 5, characterized in that: The wire harness bracket (150) includes a connecting part (151) for connecting to the wall of the main pipe (100) and a wire harness hole part (152) for fixing the wire harness, and a reinforcing rib (153) is provided between the connecting part (151) and the wire harness hole part (152).

7. The high-pressure carbon steel fuel distribution pipe according to claim 6, characterized in that: The first end (101) and end cap (130) of the main tube are fixed by high-temperature brazing through the first oxygen-free copper ring (140); The injector seat (180) and the fuel inlet seat (160) are fixed together by high-temperature brazing through a second oxygen-free copper ring (190); The second end (102) of the main pipe and the oil inlet pipe joint (120) are fixed by high-temperature brazing through a third oxygen-free copper ring (200).

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