Engine exhaust system

Abstract

The utility model relates to an engine exhaust system which comprises an exhaust pipe, a flange and an engine exhaust connector, and the exhaust pipe is connected with the engine exhaust connector through the flange in an assembling mode. A positioning pin is arranged on the end face, close to the exhaust connector, of the flange. A positioning hole is formed in the end part of the engine exhaust interface; the positioning holes are matched with the positioning pins in position; and the positioning pin is inserted into the positioning hole to realize the positioning of the flange and the exhaust interface of the engine. The positioning pin is assembled on the edge of the exhaust pipe flange, the corresponding positioning hole is formed in the engine exhaust port, and the positioning pin is inserted into the positioning hole, so that the assembling effect conforming to the design is achieved, time waste caused by continuously adjusting the assembling posture of the exhaust pipe is avoided, the assembling efficiency is high, and the assembling cost is low. The method is convenient for quickly judging the true cause of poor assembly, and is suitable for assembling all engine interfaces with circular sections and exhaust pipes.

Description

Technical Field

[0001] The utility model relates to an engine exhaust system, in particular to an engine exhaust system capable of improving the assembly efficiency of an engine exhaust pipe. Background Art

[0002] At present, most commercial vehicle engine interfaces are circular, and the matching exhaust pipe flanges are also designed to be circular. After the engine falls into the frame, there will be a certain assembly deviation, which may cause the exhaust pipe assembly to be assembled with the engine interface and fail to connect with the EGP behind it, resulting in dimensional deviation, and the assembly posture needs to be adjusted continuously, which may eventually waste a lot of time and manpower to check the component size.

[0003] Therefore, it is urgent to provide a method for improving the assembly efficiency of the engine exhaust pipe. Summary of the invention

[0004] The utility model provides an engine exhaust system capable of improving the assembly efficiency of the engine exhaust pipe in order to solve the problem of low assembly efficiency caused by dimensional deviation in the assembly of the engine exhaust pipe assembly and the engine interface in the prior art.

[0005] The utility model is realized by the following technical solutions:

[0006] The above-mentioned engine exhaust system includes an exhaust pipe, a flange and an engine exhaust interface, wherein the exhaust pipe is connected to the engine exhaust interface through the flange assembly; a positioning pin is provided on the end face of the flange close to the exhaust interface; a positioning hole is provided at the end of the engine exhaust interface; the positioning hole matches the position of the positioning pin; the positioning pin is inserted into the positioning hole to realize the positioning of the flange and the engine exhaust interface.

[0007] The engine exhaust system, wherein: the positioning pin is arranged at the edge of the flange assembly surface and protrudes toward the engine exhaust interface; the positioning hole is formed by being concave from the end surface of the engine exhaust interface.

[0008] The engine exhaust system, wherein: a hole groove is formed on the end face of the flange close to the exhaust interface; one end of the positioning pin is fixed with the hole groove by interference fit, and the other end extends freely outward.

[0009] The engine exhaust system, wherein: the positioning pin and the positioning hole are clearance-fitted. Beneficial Effects

[0010] The engine exhaust system of the utility model assembles a locating pin at the edge of the exhaust pipe flange, and designs a locating hole structure with a clearance fit relationship with the locating pin size at the assembly position corresponding to the engine exhaust interface, so that the locating hole structure and the locating pin at the edge of the exhaust pipe flange are inserted into each other, thereby achieving an assembly effect consistent with the design, avoiding time waste caused by constantly adjusting the exhaust pipe assembly posture, improving assembly efficiency, being suitable for the assembly of all engine interfaces and exhaust pipes with circular cross-sections, greatly improving assembly efficiency, and reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the exhaust pipe flange of the engine exhaust system of the utility model;

[0012] Figure 2 It is a schematic diagram of the engine exhaust interface of the engine exhaust system of the utility model;

[0013] Figure 3 It is a schematic diagram of the assembly of the engine exhaust system of the utility model.

[0014] Description of the numbers in the figure:

[0015] 1 Exhaust pipe

[0016] 2 flange 21 positioning pin 22 hole groove

[0017] 3 Engine exhaust interface 31 Positioning hole. DETAILED DESCRIPTION

[0018] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0019] In the description of the embodiments of the present application, the description of the orientation or position relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0020] The utility model is described in detail below with reference to the accompanying drawings and specific examples.

[0021] like Figure 1-Figure 3 As shown, the engine exhaust system of the utility model comprises an exhaust pipe 1 , a flange 2 and an engine exhaust interface 3 , wherein the exhaust pipe 1 is assembled and connected to the engine exhaust interface 3 through the flange 2 .

[0022] The end surface of the flange 2 close to the engine exhaust interface 3 is provided with a positioning pin 21; the positioning pin 21 is arranged at the edge of the assembly surface of the flange 2 and protrudes toward the engine exhaust interface 3;

[0023] The locating pin 21 can be an integral structure with the flange 2, or a separate structure with the flange 2; when the locating pin 21 and the flange 2 adopt a separate structure, a hole groove 22 is opened on the end face of the flange 2 close to the engine exhaust interface 3, and the hole groove 22 is formed axially inwardly from the end face. One end of the locating pin 21 is fixed with the hole groove 22 by interference fit, and the other end extends freely outward.

[0024] A positioning hole 31 is provided at the end of the engine exhaust interface 3; the positioning hole 31 is formed axially inwardly from the end face of the engine exhaust interface 3, matching the position of the positioning pin 21; the positioning hole 31 and the positioning pin 21 are clearance-matched, and the positioning pin 21 is inserted into the positioning hole 31 to realize the positioning of the exhaust pipe flange 2 and the engine exhaust interface 3; the positioning pin 21 and the positioning hole 31 constitute a positioning reference, which greatly improves the operating convenience, reduces the working hours by at least 10% compared with the assembly process without setting the positioning reference, and can achieve an assembly effect consistent with the design.

[0025] The specific assembly process of the engine exhaust system of the utility model is as follows:

[0026] Add a positioning pin 21 at the edge of the exhaust pipe flange 2;

[0027] A positioning hole 31 is designed at a position corresponding to the engine exhaust interface 3;

[0028] (3) During assembly, align the positioning pin 21 of the exhaust pipe flange 2 with the positioning hole 31 of the engine exhaust interface 3 and insert it;

[0029] (4) Use a clamp to fix the two together.

[0030] The engine exhaust pipe of the utility model forms a positioning reference by adding a positioning pin on the exhaust pipe flange and a positioning hole structure on the end face of the engine interface. The operation is simple and convenient, and the assembly efficiency is improved. The time waste caused by constantly adjusting the assembly posture of the exhaust pipe is avoided. The assembly efficiency is high and the effect is good. The real cause of the poor assembly is easy to judge and the processing cost is reduced. The utility model is suitable for the assembly of engine interfaces and exhaust pipes of all circular cross-sections.

Claims

1. An engine exhaust system, comprising an exhaust pipe, a flange and an engine exhaust interface, wherein the exhaust pipe is connected to the engine exhaust interface through the flange assembly; characterized in that: A positioning pin is provided on the end face of the flange close to the exhaust interface; a positioning hole is provided at the end of the engine exhaust interface; the positioning hole matches the position of the positioning pin; the positioning pin is inserted into the positioning hole to realize the positioning of the flange and the engine exhaust interface.

2. The engine exhaust system according to claim 1, characterized in that: The positioning pin is arranged at the edge of the flange assembly surface and protrudes toward the engine exhaust interface; the positioning hole is formed by being concave from the end surface of the engine exhaust interface.

3. The engine exhaust system according to claim 2, characterized in that: The end surface of the flange close to the exhaust interface is provided with a hole groove; one end of the positioning pin is fixed with the hole groove by interference fit, and the other end is freely extended outward.

4. The engine exhaust system according to claim 3, characterized in that: The positioning pin and the positioning hole are clearance-fitted.

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