Adjustable connecting flange structure for exhaust pipeline of heavy truck

Abstract

The utility model relates to an adjustable connecting flange structure of an exhaust pipeline, which ensures the manufacturing precision of a flange and the pipeline through the structural design of the flange and avoids the assembly difficulty caused by errors, thereby reducing the manufacturing cost and improving the assembly efficiency. Comprising an inner ring flange (1) and an outer ring flange (2), an exhaust pipeline (3) is sleeved with the outer ring flange (2), the inner ring flange (1) is provided with a step face, the small end of the inner ring flange (1) is matched with the exhaust pipeline (3) in size and inserted into a port of the exhaust pipeline (3), the rear end face of the inner ring flange (1) is attached to the front end face of the exhaust pipeline (3), and the rear end face of the inner ring flange (1) and the exhaust pipeline (3) are welded into a whole on the inner side of a pipe. The outer ring flange (2) can rotate around the axis of the exhaust pipeline (3) and is provided with an inner step face matched with the inner ring flange (1).

Description

Technical Field

[0001] The utility model relates to a flange structure, in particular to an adjustable connecting flange structure of an exhaust pipeline of a heavy truck. Background Art

[0002] The main function of the exhaust system of a heavy-duty truck is to ensure the optimal performance of the engine while discharging the exhaust gas generated by the engine during operation into the atmosphere after air purification and noise reduction treatment through the exhaust pipe and DOC-DPF-SCR box.

[0003] In the design of the whole vehicle, the exhaust pipe connection mostly adopts the flange bolt connection form. Based on the layout requirements of the whole vehicle, the exhaust pipe needs to avoid the surrounding parts of the whole vehicle due to the heat source characteristics. Therefore, the pipeline design is complicated, which puts high requirements on the manufacturing accuracy of the pipeline connection flange, including the verticality of the axis and the circumferential rotation angle. The common solution adopted in current design and manufacturing is to accurately control the relative angle and direction of the square flange 1 or the circular flange 2 and the pipeline 3 through molds and inspection fixtures to ensure the accurate spatial position of the exhaust pipe. Figure 1 shown.

[0004] During the design and production process of such parts, due to the long exhaust pipe, for some low-cost simple molds, even very small errors will cause deviations in the exhaust pipe after installation. Slight changes in the angle of the flange end will cause large deviations in the end connection. High manufacturing accuracy must be ensured, and the investment in precise tooling, molds and inspection fixtures will undoubtedly increase manufacturing costs. Utility Model Content

[0005] The purpose of the utility model is to provide an adjustable connecting flange structure for an exhaust pipe, which ensures the manufacturing accuracy of the flange and the pipe through the structural design of the flange itself, avoids assembly difficulties caused by errors, thereby reducing manufacturing costs and improving assembly efficiency.

[0006] The utility model is realized by the following technical solutions:

[0007] A heavy-duty truck exhaust pipe adjustable connecting flange structure includes an inner ring flange 1 and an outer ring flange 2. The exhaust pipe 3 is inserted into the outer ring flange 2. The inner ring flange 1 is designed with a stepped surface. The small end is matched with the size of the exhaust pipe 3 and inserted into the port of the exhaust pipe 3. The rear end face of the inner ring flange 1 fits with the front end face of the exhaust pipe 3. The rear end face of the inner ring flange 1 and the exhaust pipe 3 are welded into one on the inside of the pipe. The outer ring flange 2 can rotate around the axis of the exhaust pipe 3. The outer ring flange 2 is provided with an inner stepped surface that matches the inner ring flange 1.

[0008] The inner ring flange 1 is provided with an embedded boss adapted to match the engine flange 4 when connected thereto.

[0009] After the implementation of the utility model, the positioning mold at the exhaust pipe flange can be omitted, which reduces the investment in tooling and molds, lowers the manufacturing cost, and improves the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of an existing exhaust pipe in the background art;

[0011] Figure 2 This is a schematic diagram of the exhaust pipe of the utility model;

[0012] Figure 3 It is a sectional view of the flange connection of the utility model. DETAILED DESCRIPTION

[0013] The exhaust pipe flange structure of the present invention is composed of an inner flange 1 and an outer flange 2. The exhaust pipe 3 is inserted into the outer flange 2. The inner flange 1 is designed with a stepped surface. The small end matches the size of the exhaust pipe 3 and is inserted into the port of the exhaust pipe 3. The rear end face of the inner flange 1 fits with the front end face of the exhaust pipe 3 to ensure the axial verticality of the entire mounting flange and the pipe. The rear end face of the inner flange 1 and the exhaust pipe 3 are welded together on the inside of the pipe. At this time, the inner flange 1 can prevent the outer flange 2 from coming out, and the outer flange 2 can be rotated around the axis of the exhaust pipe 3 to adjust the position of the bolt hole. The bosses of the two are designed to fit in a matching embedded relationship. Figure 2 shown.

[0014] When connected to the engine flange 4, the front end of the inner ring flange 1 is designed with an embedded boss to adapt to it. The front end of the inner ring flange 1 is inserted into the engine flange 4 to achieve the assembly positioning function while ensuring the sealing of the pipeline at the flange connection. At this time, the outer ring flange 2 can rotate around the pipeline circumference, and the flange fixing hole can freely adjust the installation rotation angle. There is no need for high-precision mold positioning. After the bolts are tightened, the outer ring flange 2 is pressed against the inner ring flange 1 at the step to achieve pipeline flange connection. Figure 3 shown.

[0015] During the assembly process, assemblers do not need to use tooling to find the specific installation angle of the pipeline. They can simply insert the flange structure into position and rotate the outer ring to align the assembly bolts, which greatly saves assembly adjustment time and improves vehicle assembly efficiency.

[0016] Compared with the commonly used tooling positioning schemes, the present invention splits the flange into an inner and outer ring structure. The inner ring flange plays the role of axial pipeline positioning, and the outer ring flange can be rotated and adjusted. There is no need to use a mold to ensure the accuracy of the mounting hole, and the manufacturing and assembly processes are simpler.

Claims

1. An adjustable connecting flange structure for a heavy truck exhaust pipe, characterized by: The invention comprises an inner ring flange (1) and an outer ring flange (2), wherein the exhaust pipe (3) is inserted into the outer ring flange (2), the inner ring flange (1) is designed with a stepped surface, the small end of which matches the size of the exhaust pipe (3) and is inserted into the exhaust pipe (3) port, the rear end face of the inner ring flange (1) fits the front end face of the exhaust pipe (3), the rear end face of the inner ring flange (1) and the exhaust pipe (3) are welded into one on the inner side of the pipe, the outer ring flange (2) can rotate around the axis of the exhaust pipe (3), and the outer ring flange (2) is provided with an inner stepped surface matching the inner ring flange (1).

2. The adjustable connecting flange structure for a heavy truck exhaust pipe according to claim 1 is characterized by: The inner ring flange (1) is provided with an embedded boss adapted to the engine flange (4) when connected thereto.

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