A trunk type forged main pipe and a trunk type brazed forged high-pressure oil rail assembly

Abstract

The utility model provides a kind of tree trunk type forging main pipe and tree trunk type brazing forging high-pressure oil rail assembly, one of which tree trunk type forging main pipe, including pipe body, the part corresponding to oil inlet pipe joint of pipe body surface and / or the part corresponding to sensor joint and / or the part corresponding to oil atomizer seat, is equipped with thickening part, forms thickening branch node.The utility model solves the problem of how to avoid the stress concentration of the intersection line at the connection between the sub-components (such as pipe joint, sensor seat, oil atomizer seat, etc.) on the conventional brazing high-pressure oil rail and the surface of the main pipe.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel distribution pipes for internal combustion engines, and in particular to a trunk-shaped forged main pipe and a trunk-shaped brazed forged high-pressure fuel rail assembly. Background Technology

[0002] Upgrading the existing 350Bar brazed high-pressure fuel rail 11 to a 500Bar system pressure presents the following problems: The brazed high-pressure fuel rail 11 is mostly composed of straight cylindrical sub-parts brazed together. When upgrading to a 500Bar system pressure, the maximum stress concentration formed by the intersection lines between the cylinders fails to meet fatigue strength requirements. For example, the intersection lines 11-2 between the inlet pipe connector and the main pipe body 11-1, 11-3 between the sensor connector and the main pipe body 11-1, 11-4 between the bolt bracket block and the main pipe body 11-1, and 11-5 between the injector seat and the main pipe body 11-1 are also known as "branch intersection lines." These intersection lines have the highest stress concentration, often leading to weld cracking and leakage. Therefore, the upgrade is not feasible.

[0003] Therefore, how to avoid stress concentration at the intersection line between the sub-components (such as pipe joints, sensor seats, injector seats, etc.) on the conventionally brazed high-pressure oil rail and the main pipe surface has become a technical problem that needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a trunk-shaped forged main pipe and a trunk-shaped brazed forged high-pressure oil rail assembly, which mainly solves the problem of how to avoid stress concentration at the intersection line of the sub-parts (such as pipe joints, sensor seats, injector seats, etc.) on the surface of the main pipe with the conventional brazed high-pressure oil rail.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a trunk-shaped forged main pipe, including a pipe body, characterized in that: the surface of the pipe body is provided with a thickened part corresponding to the oil inlet pipe joint and / or the sensor joint and / or the injector seat, forming thickened branches.

[0006] Furthermore, the top of the thickened part is provided with a flat surface for installing an oil inlet pipe connector, a sensor connector, or an injector seat, and a boss is formed on the top of the thickened part;

[0007] And / or thicken the bottom of the branches and the tube body to form forged rounded corners.

[0008] Furthermore, the thickened portion covers a circumferential half-circumference or more of the pipe body surface;

[0009] And / or the end face of the boss is a plane.

[0010] Furthermore, a bolt mounting bracket block is provided on the surface of the pipe body, and a first rounded corner is provided at the connection between the bolt mounting bracket block and the surface of the pipe body.

[0011] Furthermore, the thickened branches are integrally formed with the pipe body;

[0012] The oil passage is located in the center of the thickened branch.

[0013] A tree trunk-type brazed forged high-pressure oil rail assembly, relating to the aforementioned tree trunk-type forged main pipe, characterized in that: the oil inlet pipe joint is connected to the thickened branch of the corresponding oil inlet pipe joint;

[0014] And / or connect the sensor connector to the corresponding thickened stub of the sensor connector;

[0015] And / or the injector seat is connected to the thickened branch of the corresponding injector seat.

[0016] Furthermore, the material of the oil inlet pipe fitting is different from that of the pipe body, and the hardness of the oil inlet pipe fitting is greater than that of the pipe body.

[0017] Or the material of the sensor connector is different from that of the tube body, and the hardness of the sensor connector is greater than that of the tube body;

[0018] Or the material of the injector seat is different from that of the pipe body, and the hardness of the injector seat is greater than that of the pipe body.

[0019] A trunk-type brazed forged high-pressure oil rail assembly, relating to the aforementioned trunk-type forged main pipe, characterized in that: the connection point of the oil inlet pipe joint for connecting with the pipe body is planar, and the connection point of the oil inlet pipe joint is connected with the boss for installing the oil inlet pipe joint.

[0020] The connection point of the sensor connector to the pipe body is flat, and the connection point of the sensor connector is connected to the boss used to install the sensor connector.

[0021] The connection point of the injector seat to the pipe body is flat, and the connection point of the injector seat is connected to the boss used to install the injector seat.

[0022] Furthermore, the material of the oil inlet pipe fitting is different from that of the pipe body, and the hardness of the oil inlet pipe fitting is greater than that of the pipe body.

[0023] Or the material of the sensor connector is different from that of the tube body, and the hardness of the sensor connector is greater than that of the tube body;

[0024] Or the material of the injector seat is different from that of the pipe body, and the hardness of the injector seat is greater than that of the pipe body.

[0025] Furthermore, the bottoms of the injector seat, the fuel inlet pipe connector, and the sensor connector are all flat, and the bottoms of the injector seat, the fuel inlet pipe connector, and the sensor connector are all provided with outwardly protruding positioning bosses for embedding into the oil passage holes in the thickened branches.

[0026] Alternatively, the ends of the pipe body can be sealed by brazing end caps;

[0027] Alternatively, the oil inlet pipe joint can be connected to the end of the pipe body by brazing or integral forging;

[0028] Alternatively, the sensor connector may be connected to the end of the tube body via brazing or integral forging;

[0029] Alternatively, the oil inlet pipe connector can be connected to one end of the pipe body, and the sensor connector can be connected to the other end of the pipe body.

[0030] Alternatively, one end of the tube may be a blind hole, while the other end of the tube may be sealed by brazing an end cap.

[0031] In view of the above technical features, the present invention has the following beneficial effects:

[0032] 1. The present invention relates to a trunk-shaped forged main pipe, wherein the pipe body is forged into thickened branches. The thickened branches on the pipe body can effectively disperse stress and avoid stress concentration at the intersection line of the branches. This solves the problem of how to avoid stress concentration at the intersection line of the connection between the sub-parts (such as pipe joints, sensor seats, injector seats, etc.) on the conventional brazing high-pressure oil rail and the main pipe surface (i.e., the pipe body) in the prior art.

[0033] 2. This utility model discloses a trunk-type forged main pipe. During pipe body forging, there is no need to forge long branch parts (such as pipe fittings, sensor seats, injector seats, etc.). The required forging billet weight is smaller, and the bar diameter is smaller, avoiding the drawbacks of one-piece forged high-pressure oil rails, such as large forging weight, low yield, and high cost of long branch forging billets for injector seats, sensor seats, and inlet pipe fittings. One-piece forged high-pressure oil rails refer to high-pressure oil rails obtained by forging the pipe body and long branch parts (such as pipe fittings, sensor seats, injector seats, etc.) together as a single unit.

[0034] 3. The present invention provides a trunk-shaped forged main pipe, the pipe body of which is subsequently connected to injector seat, inlet pipe joint, sensor joint and end cap and other sub-parts by brazing to form a high-pressure oil rail assembly, thereby avoiding the defects of low hardness and softness of the inlet pipe joint and / or sensor seat of the one-piece forged high-pressure oil rail.

[0035] 4. The present invention relates to a trunk-type forged main pipe with corresponding oil passage holes on the thickened branches of the pipe body. The oil passage holes can be made larger to facilitate deburring and chamfering of the intersection line between the oil passage holes and the inner hole of the main pipe from the outside. Machining deburring replaces the electrochemical corrosion of the forged rail used in the integral forged high-pressure oil rail to remove burrs at the intersection line of the main pipe oil passage holes, solving the problems of instability and slow cycle time, and improving machining efficiency.

[0036] 5. The present invention provides a trunk-type forged main pipe with end caps brazed for sealing at the pipe ends, which solves the problem of unreliable sealing of the tightening plugs in integral forged high-pressure oil rails. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a 350Bar brazed high-pressure oil rail in the existing technology. Figure 1 .

[0038] Figure 2 This is a schematic diagram of the structure of a 350Bar brazed high-pressure oil rail in the existing technology. Figure 2 .

[0039] Figure 3 This is a schematic diagram of the structure of a 350Bar brazed high-pressure oil rail in the existing technology. Figure 3 .

[0040] Figure 4 This is a schematic diagram of the structure of a trunk-type forging main tube in specific embodiment 1. Figure 1 .

[0041] Figure 5 This is a schematic diagram of the structure of a trunk-type forging main tube in specific embodiment 1. Figure 2 .

[0042] Figure 6 This is a schematic diagram of the structure of a forging blank used in a trunk-shaped forging main pipe in specific embodiment 1. Figure 1 .

[0043] Figure 7 This is a schematic diagram of the structure of a forging blank used in a trunk-shaped forging main pipe in specific embodiment 1. Figure 2 .

[0044] Figure 8 This is a schematic diagram of the structure of a forging blank used in a trunk-shaped forging main pipe in specific embodiment 1. Figure 3 (Side view angle, showing the diameter of the raw material bar for forging).

[0045] Figure 9 This is a schematic diagram of the structure of a trunk-type brazed forged high-pressure oil rail assembly in specific embodiment 2. Figure 1 (Before assembly)

[0046] Figure 10 This is a schematic diagram of the structure of a trunk-type brazed forged high-pressure oil rail assembly in specific embodiment 2. Figure 2 (Before assembly)

[0047] Figure 11 This is a schematic diagram of the structure of a trunk-type brazed forged high-pressure oil rail assembly in specific embodiment 2. Figure 1 (After assembly)

[0048] Figure 12 This is a schematic diagram of the structure of a trunk-type brazed forged high-pressure oil rail assembly in specific embodiment 2. Figure 2 (After assembly)

[0049] In the figure: 1. A tree trunk-shaped forged main pipe; 1-1. Pipe body; 1-2. Thickened branches; 1-3. Boss; 1-4. First fillet; 1-5. Forged fillet; 1-6. Oil passage hole;

[0050] 2. Injector housing;

[0051] 3. Sensor connector;

[0052] 4. Oil inlet pipe connector;

[0053] 5. End caps;

[0054] 6. Forging billet;

[0055] 7. Bolt-mounted bracket blocks;

[0056] 8. Trunk-type brazed forged high-pressure oil rail assembly;

[0057] Existing technology

[0058] 11. 350Bar brazed high-pressure oil rail; 11-1. Pipe body; 11-2. Intersection line between oil inlet pipe joint and pipe body; 11-3. Intersection line between sensor joint and pipe body; 11-4. Intersection line between bolt bracket block and pipe body; 11-5. Intersection line between injector seat and pipe body. Detailed Implementation

[0059] 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.

[0060] See Figures 6 to 12Specific embodiment 1 provides a trunk-shaped forged main pipe, including a pipe body 1-1. The surface of the pipe body 1-1 has thickened portions corresponding to the oil inlet pipe connector 4 and / or the sensor connector 3 and / or the injector seat 2, forming thickened branches 1-2. In this embodiment 1, the connection points between the trunk-shaped forged pipe body 1-1 and the sub-parts (injector seat 2, oil inlet pipe connector 4, and / or sensor connector 3, etc.) are referred to as branches. The surfaces of the pipe body 1-1 corresponding to the oil inlet pipe connector 4, the sensor connector 3, and the injector seat 2 all have thickened portions, each forming a corresponding thickened branch 1-2. The surface of the pipe body 1-1 has multiple thickened branches 1-2, and the pipe body 1-1 resembles the trunk of a tree; therefore, the forged main pipe in this embodiment 1 is defined as a trunk-shaped forged main pipe.

[0061] The outer diameter of the thickened branch 1-2 is larger than that of the main pipe 1-1, resulting in a greater thickness at the thickened branch 1-2. This effectively avoids stress concentration at the intersection line of the branches, solving the problem in existing technologies of how to avoid stress concentration at the intersection line between the sub-components (such as pipe joints, sensor seats, injector seats, etc.) on the high-pressure oil rail and the main pipe surface. Simultaneously, it also enhances the strength of the oil passage hole 1-6, thereby reducing the maximum concentrated stress at the intersection line between the oil passage hole 1-6 and the inner hole of the main pipe 1-1.

[0062] The top of the thickened part has a flat surface for mounting the oil inlet pipe connector 4, the sensor connector 3, or the injector seat 2. The top of the thickened part forms a boss 1-3, for example, the end face of the boss 1-3 is flat. This facilitates processing and manufacturing, increases processing efficiency, reduces cost, and facilitates subsequent installation of corresponding sub-parts (injector seat 2, oil inlet pipe connector 4, and / or sensor connector 3, etc.) using the boss 1-3.

[0063] Alternatively, thickening the bottom of branch 1-2 and the tube body 1-1 to form a forged fillet 1-5 disperses stress concentration and avoids the problem of weld cracking and leakage caused by excessive stress concentration at the branch intersection line in traditional 350Bar brazed high-pressure oil rails. This effectively avoids stress concentration at the branch intersection line. The forged fillet 1-5 is a chamfer formed by forging.

[0064] The thickened section covers a circumferential half-circumference or more of the surface of the tube body 1-1. In particular, the thickened branch 1-2 increases the outer diameter of the branch near the oil passage hole 1-6 of the tube body 1-1, which is equivalent to locally increasing the wall thickness. This eliminates the need for a uniform increase in the outer diameter of the tube body 1-1 as a whole, reduces stress concentration at the intersection line of the oil passage hole 1-6, and meets the requirements for system pressure upgrade.

[0065] The trunk-shaped forged main pipe has a hollow inner hole in the middle of its tube body 1-1. At the connection point between the tube body 1-1 and other parts (such as the injector seat 2, inlet pipe connector 4, and sensor connector 3), there is an oil passage hole 1-6 that connects to the inner hole. Preferably, the oil passage hole 1-6 is located at the center of the thickened branch 1-2. The oil passage hole 1-6 is relatively large (e.g., the diameter of the oil passage hole 1-6 is in the range of 3mm to 6mm), making it easy to deburr and chamfer the intersection line between the oil passage hole 1-6 and the inner hole of the main pipe 1-1 from the outside. This avoids the need for ECM electrochemical corrosion deburring from inside the main pipe 1-1, improving the production cycle of the trunk-shaped forged main pipe, reducing manufacturing costs, and being more environmentally friendly. It overcomes the difficulty of chamfering the intersection line between the oil passage hole and the inner hole of the main pipe in an integral forged high-pressure oil rail, which requires a professional ECM electrochemical corrosion process and is costly. For example, the inner diameter of the existing one-piece forged high-pressure oil rail inlet pipe joint is approximately 1.0-1.5mm. This small diameter makes it difficult to remove residual burrs, leading to a high risk of customer complaints. Similarly, the inner diameter of the existing one-piece forged high-pressure oil rail sensor joint is approximately 2.0-3.0mm. This small diameter also makes it difficult to remove residual burrs, further increasing the risk of customer complaints. The surface of the pipe body 1-1 is also equipped with a bolt mounting bracket block 7. The connection between the bolt mounting bracket block 7 and the surface of the pipe body 1-1 has a first fillet 1-4, which effectively eliminates stress concentration. The pipe body 1-1 and the bolt mounting bracket block 7 of the trunk-shaped forged main pipe are integrally forged, greatly enhancing the strength of the bolt mounting bracket block 7. The radius of the first fillet 1-4 is greater than or equal to 3mm.

[0066] The thickened branches 1-2 are integrally formed with the pipe body 1-1. In this embodiment 1, a trunk-shaped forged main pipe 1 is machined from a forging blank 6 of a trunk-shaped forged main pipe. The forging blank 6 of the trunk-shaped forged main pipe already forms the integral thickened branches 1-2 and the pipe body 1-1. This reduces the number of branches such as the injector seat 2, the inlet pipe connector 4, and the sensor seat, significantly reducing the cross-sectional area. The diameter of the forged round bar corresponding to the forging blank 6 required for the pipe body 1-1 is smaller (i.e., a smaller diameter round bar can be used; see [reference]). Figure 8 In this embodiment 1, a tree trunk-shaped forging main pipe 1 is made of forging round bar material with a smaller diameter, which saves the cost of round bar material, greatly improves the forging yield, reduces the cost of raw materials and the tonnage of forging equipment, and reduces the production cost of high-pressure oil rail assembly.

[0067] In this embodiment 1, a trunk-shaped forged main pipe 1 does not require the integral forging of the oil pipe joint, sensor joint 3, injector seat 2, and other long branches. This makes the diameter of the raw material round bar of the forging billet 6 of the trunk-shaped forged main pipe smaller. For example, only a round bar with a diameter of 60mm is needed. The weight of the forged billet 6 is often only one-half to two-thirds of the weight of the round bar. At the same time, the compact structure greatly improves the yield and effectively reduces the production cost. This overcomes the problems of existing long-branched 350Bar integral forged oil rails, which have large outer diameter of the raw material round bar, low material utilization, and high cost.

[0068] See Figures 6 to 12 In specific embodiment 2, this embodiment 2 provides a trunk-type brazed forged high-pressure oil rail assembly, including a trunk-type forged main pipe 1 as described in embodiment 1 above. The connection point of the oil inlet pipe connector 4 to the pipe body 1-1 is planar, and the connection point of the oil inlet pipe connector 4 is connected to the boss 1-3 used for mounting the oil inlet pipe connector 4. The connection point of the sensor connector 3 to the pipe body 1-1 is planar, and the connection point of the sensor connector 3 is connected to the boss 1-3 used for mounting the sensor connector 3. The connection point of the injector seat 2 to the pipe body 1-1 is planar, and the connection point of the injector seat 2 is connected to the boss 1-3 used for mounting the injector seat 2. The thickened branch 1-2 corresponding to the boss 1-3 forms a large rounded corner with the pipe body 1-1, reducing stress concentration. This also overcomes the problems of long machining time, rapid tool wear, and high machining and tooling costs associated with machining integral forged high-pressure oil rails, which require machining the threads of the oil inlet pipe connector, sensor connector, and high-precision inner holes of the injector seat.

[0069] The connection points of the oil inlet pipe connector 4, the sensor connector 3, and the injector seat 2 are all flat, making it easier for them to connect to the boss 1-3 of the pipe body 1-1. This replaces the traditional brazing of the bottom of the injector seat 2, oil inlet pipe connector 4, and sensor seat, greatly reducing the processing difficulty and cost.

[0070] Injector housing 2, sensor connector 3, fuel inlet pipe connector 4, and end cap 5 are all machined from round bar stock, resulting in low waste, high quality, and low cost.

[0071] The tube body 1-1 of the trunk-type forged main pipe only requires turning, gun drilling, milling, and internal hole chamfering processes. The processing is simple and of high quality. It avoids the electrochemical corrosion chamfering, long-term external and internal thread processing, high-precision oil inlet pipe joint 4 sealing surface processing, and high-precision sealing surface processing of the inner hole of the injector seat 2 of the integral forged oil rail, which greatly reduces the cost.

[0072] Both ends of pipe body 1-1 are sealed by brazing end caps 5. Alternatively, the ends of pipe body 1-1 can be sealed by brazing end caps 5; or the oil inlet pipe connector 4 can be connected to the end of pipe body 1-1, for example, by brazing; or the sensor connector 3 can be connected to the end of pipe body 1-1, for example, by brazing; or the oil inlet pipe connector 4 can be connected to one end of pipe body 1-1, and the sensor connector 3 can be connected to the other end of pipe body 1-1, for example, by brazing; or one end of pipe body 1-1 is a blind hole, and the other end of pipe body 1-1 is sealed by brazing end caps 5. The brazing process at the end of pipe body 1-1 solves the problem of unreliable tightening of the integral forged oil rail plug, which leads to leakage.

[0073] In this embodiment 2, the connection points of the oil inlet pipe joint 4, sensor joint 3, and injector seat 2 for connection with the pipe body 1-1 are all planar, which can be machined independently, resulting in fast cycle time and low cost. This overcomes the problems of long cycle time, high tool cost, high scrap rate, and high cost in the existing technology for machining the thread of the oil inlet pipe joint and the internal thread of the sensor joint used for 350Bar brazed high-pressure oil rail. It also overcomes the problems of long cycle time, high tool cost, high scrap rate, and high cost in machining the high-precision sealing surface of the injector seat. Furthermore, it overcomes the problems of long cycle time, corrosion liquid contamination, and high cost in chamfering the intersection line of the oil passage hole and the inner hole of the main pipe (such as the oil passage hole). Finally, it overcomes the problem of unreliable sealing when tightening the integral forged oil rail plug.

[0074] The material of the inlet pipe connector 4 is different from that of the pipe body 1-1, and the hardness of the inlet pipe connector 4 is greater than that of the pipe body 1-1; the material of the sensor connector 3 is different from that of the pipe body 1-1, and the hardness of the sensor connector 3 is greater than that of the pipe body 1-1; the material of the injector seat 2 is different from that of the pipe body 1-1, and the hardness of the injector seat 2 is greater than that of the pipe body 1-1. The inlet pipe connector 4 and the sensor connector 3 can be made of different materials, and their material hardness can be greater than that of the main pipe body 1-1. This is beneficial to the hard seal reliability of the inlet pipe connector 4 and the high-pressure oil pipe end, and also beneficial to the hard seal reliability of the sensor connector 3 and the sensor. This application avoids the situation where the materials and hardness of the inlet pipe connectors and sensor connectors on an integrally forged oil rail are the same as those of the main body. Because the inlet pipe joint, sensor joint, and oil rail body are forged as a single piece, and the inlet pipe joint and sensor joint are annealed together with the forging blank, the hardness of the inlet pipe joint and / or sensor joint is very low, similar to that of the forging blank itself. This results in insufficient hard seal requirements; the overall hardness is relatively low, which is detrimental to the mechanical hard seal between the inlet pipe joint and the high-pressure oil pipe end, and also to the mechanical hard seal between the sensor seat and the sensor. For example, when the trunk-shaped forged main pipe is made of 304 or 304L, the inlet pipe and / or sensor can be made of harder martensitic or duplex stainless steel, such as 1.4418 or 1.4462 / 1.4362.

[0075] See Figures 6 to 12 In specific embodiment 3, this embodiment 3 provides a trunk-type brazed forged high-pressure oil rail assembly, including a trunk-type forged main pipe 1 as described in embodiment 1 above, an oil inlet pipe joint 4 connected to the corresponding thickened branch 1-2 of the oil inlet pipe joint 4; and / or a sensor joint 3 connected to the corresponding thickened branch 1-2 of the sensor joint 3; and / or an injector seat 2 connected to the corresponding thickened branch 1-2 of the injector seat 2.

[0076] The material of the oil inlet pipe connector 4 is different from that of the pipe body 1-1, and the hardness of the oil inlet pipe connector 4 is greater than that of the pipe body 1-1; the material of the sensor connector 3 is different from that of the pipe body 1-1, and the hardness of the sensor connector 3 is greater than that of the pipe body 1-1; the material of the injector seat 2 is different from that of the pipe body 1-1, and the hardness of the injector seat 2 is greater than that of the pipe body 1-1. For specific technical effects, please refer to Example 2. Both ends of the pipe body 1-1 are sealed by brazing with end caps 5.

[0077] In specific embodiment 4, a trunk-type brazed forged high-pressure oil rail assembly is provided. The difference from the previous embodiments is that the oil inlet pipe connector 4 is connected to the end of the pipe body 1-1 by integral forging; the sensor connector 3 is connected to the end of the pipe body 1-1 by integral forging, which provides better sealing.

[0078] For example, the oil inlet pipe joint 4 at the rail end of the tube body 1-1 of the tree trunk-type brazed forged high-pressure oil rail assembly 8, or the sensor joint 3, can be integrally forged together with the tube body 1-1 of the tree trunk-type forged main tube, and then machined into shape.

[0079] Specific embodiment 5 provides a trunk-type brazed forged high-pressure oil rail assembly, which differs from the previous embodiments in that: the bottom of the injector seat 2, the oil inlet pipe joint 4, and the sensor joint 3 are all flat, and the bottom of the injector seat 2, the oil inlet pipe joint 4, and the sensor joint 3 are all provided with outwardly protruding positioning bosses (not shown in the figure) for embedding into the oil passage holes 1-6 in the thickened branches 1-2. When the injector seat 2, the oil inlet pipe joint 4, and the sensor joint 3 are brazed with the thickened branches 1-2 or the bosses 1-3 of the pipe body 1-1, the positioning bosses are embedded into the corresponding oil passage holes 1-6, playing a pre-positioning role.

[0080] 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.

[0081] 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.

[0082] 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 trunk-shaped forged main pipe, comprising a pipe body (1-1), characterized in that: The surface of the pipe body (1-1) is provided with a thickened part corresponding to the oil inlet pipe connector (4) and / or the sensor connector (3) and / or the injector seat (2), forming a thickened branch (1-2).

2. The trunk-shaped forged main tube according to claim 1, characterized in that: The top of the thickened part has a flat surface for installing the oil inlet pipe connector (4), sensor connector (3), or injector seat (2), and the top of the thickened part forms a boss (1-3); And / or thicken the bottom of the branch (1-2) and the tube body (1-1) to form a forged fillet (1-5).

3. The trunk-shaped forged main tube according to claim 2, characterized in that: The thickened portion covers a circumferential half-circumference or more of the surface of the tube body (1-1); The end face of the boss (1-3) is a plane.

4. The trunk-shaped forged main tube according to claim 3, characterized in that: The surface of the pipe body (1-1) is also provided with a bolt mounting bracket block (7), and the connection between the bolt mounting bracket block (7) and the surface of the pipe body (1-1) is provided with a first rounded corner (1-4).

5. The trunk-shaped forged main tube according to claim 4, characterized in that: The thickened branches (1-2) are integrally formed with the tube body (1-1); The oil passage (1-6) is located at the center of the thickened branch (1-2).

6. A trunk-type brazed forged high-pressure hydraulic rail assembly, relating to the trunk-type forged main pipe as described in claim 1, characterized in that: The oil inlet pipe joint (4) is connected to the thickened branch (1-2) of the corresponding oil inlet pipe joint (4); And / or the sensor connector (3) is connected to the thickened branch (1-2) of the corresponding sensor connector (3); And / or the injector seat (2) is connected to the thickened branch (1-2) of the corresponding injector seat (2).

7. The trunk-type brazed forged high-pressure oil rail assembly according to claim 6, characterized in that: The material of the oil inlet pipe connector (4) is different from that of the pipe body (1-1). The hardness of the oil inlet pipe connector (4) is greater than that of the pipe body (1-1). Or the material of the sensor connector (3) is different from that of the tube body (1-1), and the hardness of the sensor connector (3) is greater than that of the tube body (1-1). Or the material of the injector seat (2) is different from that of the pipe body (1-1), and the hardness of the injector seat (2) is greater than that of the pipe body (1-1).

8. A trunk-type brazed forged high-pressure hydraulic rail assembly, relating to a trunk-type forged main pipe as described in any one of claims 2 to 5, characterized in that: The connection point of the oil inlet pipe connector (4) to the pipe body (1-1) is flat, and the connection point of the oil inlet pipe connector (4) is connected to the boss (1-3) for installing the oil inlet pipe connector (4); The connection point of the sensor connector (3) to the pipe body (1-1) is flat, and the connection point of the sensor connector (3) is connected to the boss (1-3) for mounting the sensor connector (3). The connection point of the injector seat (2) to the pipe body (1-1) is flat, and the connection point of the injector seat (2) is connected to the boss (1-3) used to install the injector seat (2).

9. The trunk-type brazed forged high-pressure oil rail assembly according to claim 8, characterized in that: The material of the oil inlet pipe connector (4) is different from that of the pipe body (1-1). The hardness of the oil inlet pipe connector (4) is greater than that of the pipe body (1-1). Or the material of the sensor connector (3) is different from that of the tube body (1-1), and the hardness of the sensor connector (3) is greater than that of the tube body (1-1). Or the material of the injector seat (2) is different from that of the pipe body (1-1), and the hardness of the injector seat (2) is greater than that of the pipe body (1-1).

10. A trunk-type brazed forged high-pressure hydraulic rail assembly according to claim 7 or 9, characterized in that: The bottom of the injector seat (2), the oil inlet pipe connector (4) and the sensor connector (3) are all flat. The bottom of the injector seat (2), the oil inlet pipe connector (4) and the sensor connector (3) are all provided with outwardly protruding positioning bosses for embedding into the oil passage hole (1-6) in the thickened branch (1-2). Alternatively, the ends of the tube body (1-1) may be sealed by brazing with end caps (5); The oil inlet pipe joint (4) is connected to the end of the pipe body (1-1) by brazing or integral forging; The sensor connector (3) is connected to the end of the tube body (1-1) by brazing or integral forging; Or the oil inlet pipe connector (4) is connected to one end of the pipe body (1-1), and the sensor connector (3) is connected to the other end of the pipe body (1-1); Alternatively, one end of the tube body (1-1) may be a blind hole, and the other end of the tube body (1-1) may be sealed by brazing with an end cap (5).

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