A fastening assembly and a reducer exhaust pipe using the same

Abstract

The present invention relates to reducer-related components, belonging to the field of mechanical design technology, specifically a fastening assembly and a reducer exhaust pipe using the assembly. It solves the technical problem that the outer exhaust pipe, inner exhaust pipe and bushing of the current reducer exhaust pipe may move due to the lack of a limiting mechanism when affected by axial force, radial force and vibration. A fastening assembly includes an exhaust pipe semi-circular ring and an exhaust pipe clamping ring. The cross-section of the exhaust pipe semi-circular ring is a horizontal section and an L-shaped section connected to one end of the horizontal section; the other end of the horizontal section extends downward to form a step structure, and one end of the horizontal section is connected to the top of the vertical part of the L-shaped section; the exhaust pipe clamping ring is a circular ring structure, and one side of the circular ring structure extends horizontally along the axial direction to form an extension section. After adding the exhaust pipe semi-circular ring and the exhaust pipe clamping ring, it can be ensured that the inner and outer exhaust pipes do not fall off during assembly, avoiding damage; it can also effectively prevent movement between parts.

Description

Technical Field

[0001] The invention relates to reducer-related components and belongs to the technical field of mechanical design, in particular to a fastening assembly and a reducer exhaust pipe using the assembly. Background Art

[0002] The reducer of a certain type of product is mainly composed of a housing, an intermediate bracket, a transmission gear, a lubricating oil tank, a lubricating oil pipeline, a motor output shaft, a fuel pump output shaft, a seawater pump output shaft, an oil return pump and a boost pump output shaft, exhaust pipe components, oil pipes, bearings and other components. The function of the exhaust pipe components is to cool and discharge the exhaust gas. Therefore, the components are designed with cooling water circuits and high-temperature gas circuits and are isolated from the lubricating oil cavity. In the original design drawings, the outer exhaust pipe of the exhaust pipe assembly is directly installed on the inner exhaust pipe, and the two are sealed only by an O-ring. There is no fixing device. If there is a mistake during assembly, the outer exhaust pipe will fall off the inner exhaust pipe, causing damage. During the power test, the stress situation of the exhaust pipe is more complicated. Under the joint action of cooling water and high-temperature combustion gas, the outer exhaust pipe, inner exhaust pipe and bushing are affected by axial force, radial force and vibration. Due to the long test time, movement may occur, causing damage to the mating parts of various parts, and even leading to the penetration of air-water lines, air-water lines and lubricating oil lines, causing the reducer and related parts of the connected engine, fuel pump and lubricating oil pump to be scrapped, affecting the test progress.

[0003] Specifically, the original exhaust pipe structure includes an outer exhaust pipe, an inner exhaust pipe sleeved inside the outer exhaust pipe, and an exhaust pipe bushing sleeved inside the inner exhaust pipe; a first sealing ring is fixed between the inner and outer exhaust pipes, and a second sealing ring is fixed between the inner exhaust pipe and the bushing; an annular boss is provided on the outer wall of the inner exhaust pipe to support one end of the outer exhaust pipe; one end of the bushing is limited by a retaining ring located inside the inner exhaust pipe. Summary of the Invention

[0004] The present invention aims to solve the technical problem that the outer exhaust pipe, inner exhaust pipe and bushing of the current reducer exhaust pipe may move due to the lack of a limiting mechanism when affected by axial force, radial force and vibration. A fastening assembly and a reducer exhaust pipe using the assembly are provided.

[0005] The fastening assembly described in the present invention is realized by adopting the following technical solution: a fastening assembly, including an exhaust pipe semi-circular ring and an exhaust pipe clamping ring, the cross-section of the exhaust pipe semi-circular ring is a horizontal section and an L-shaped section connected to one end of the horizontal section; the other end of the horizontal section extends downward to form a step structure, and one end of the horizontal section is connected to the top of the vertical part of the L-shaped section; the exhaust pipe clamping ring is a circular ring structure, and one side ring surface of the circular ring structure extends horizontally along the axial direction to form an extension section.

[0006] The extension section of the exhaust pipe clamp can be sleeved on the outside of the horizontal portion of the L-shaped section.

[0007] The reducer exhaust pipe described in the present invention is realized by adopting the following technical scheme: a reducer exhaust pipe, comprising an outer exhaust pipe, an inner exhaust pipe sleeved inside the outer exhaust pipe, and an exhaust pipe bushing sleeved inside the inner exhaust pipe; a first sealing ring is fixed between the inner and outer exhaust pipes, and a second sealing ring is fixed between the inner exhaust pipe and the exhaust pipe bushing; an annular limiting boss is provided on the outer wall of the inner exhaust pipe to support one end of the outer exhaust pipe; it also includes a fastening assembly; a semi-circular groove is opened on the outer wall of the outer exhaust pipe near the limiting boss, the exhaust pipe semi-circular ring is sleeved on the outer wall of the outer exhaust pipe, the step structure of the exhaust pipe semi-circular ring is stuck in the groove, the horizontal section of the exhaust pipe semi-circular ring is close to the outer wall of the outer exhaust pipe, and the vertical part of the L-shaped section of the exhaust pipe semi-circular ring is close to the rear part of the limiting boss; the exhaust pipe clamping ring is sleeved on the outer wall of the inner exhaust pipe and the extended section of the exhaust pipe clamping ring is sleeved on the outer side of the horizontal part of the L-shaped section of the exhaust pipe semi-circular ring.

[0008] The exhaust pipe semicircular ring can fasten the inner and outer exhaust pipes to each other, and the exhaust pipe clamping ring fastens the exhaust pipe semicircular ring, thereby effectively preventing the reducer exhaust pipe from moving when subjected to external force; and the inner and outer exhaust pipes are not easy to fall off during assembly.

[0009] Beneficial effects of the present invention:

[0010] (1) The present invention takes into account both the safety of assembly and the reliability of testing

[0011] After adding the exhaust pipe semi-circular ring and the exhaust pipe clamping ring, it can ensure that the inner and outer exhaust pipes will not fall off during assembly, thus avoiding damage; at the same time, when assembled in the reducer to participate in the power test of the power unit, it can effectively prevent the movement between parts and avoid the scrapping of related parts.

[0012] (2) Simple structure, easy disassembly and assembly, low cost

[0013] The newly added parts are small in size, simple in structure, and easy to install and disassemble, which can effectively save operation time. After installation, they will not interfere with other parts, while saving processing costs and shortening the processing cycle.

[0014] (3) Save a lot of costs for product development

[0015] After multiple disassembly and assembly and test verifications, the improved product can avoid the cost of reproducing the reducer and engine, variable fuel pump, and lubricating oil pump due to component damage, and save a lot of time, which is conducive to improving the product research and development progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the original exhaust pipe component structure.

[0017] Figure 2 Schematic diagram of the improved exhaust pipe components.

[0018] Figure 3 Schematic diagram of the exhaust pipe semi-circular ring structure.

[0019] Figure 4 Bit Figure 3 AA section view in.

[0020] Figure 5 Schematic diagram of the exhaust pipe clamp structure.

[0021] 1-external exhaust pipe, 2-inner exhaust pipe, 3-exhaust pipe bushing, 4-retaining ring, 5-first sealing ring, 6-second sealing ring, 7-exhaust pipe semicircular ring, 8-exhaust pipe clamping ring; 21-limiting boss, 71-horizontal section, 72-step structure, 73-L-shaped section, 81-extension section. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figure 3 、 4 As shown in Figure 5, a fastening assembly includes an exhaust pipe semicircular ring 7 and an exhaust pipe clamping ring 8. The cross-section of the exhaust pipe semicircular ring 7 is a horizontal section 71 and an L-shaped section 73 connected to one end of the horizontal section 71; the other end of the horizontal section 73 extends downward to form a step structure 72, and one end of the horizontal section 71 is connected to the top of the vertical part of the L-shaped section 73; the exhaust pipe clamping ring 8 is a circular ring structure, and one side of the circular ring structure extends horizontally along the axial direction to form an extension section 81.

[0024] Example 2

[0025] The exhaust pipe clamping ring 8 has an inner diameter of 89 mm, an outer diameter of 94 mm, and a thickness of 10.9 mm.

[0026] Example 3

[0027] A reducer exhaust pipe, comprising an outer exhaust pipe 1, an inner exhaust pipe 2 sleeved inside the outer exhaust pipe 1, and an exhaust pipe bushing 3 sleeved inside the inner exhaust pipe 2; a first sealing ring 5 is fixed between the inner and outer exhaust pipes, and a second sealing ring 6 is fixed between the inner exhaust pipe 2 and the exhaust pipe bushing 3; an annular limiting boss 21 is provided on the outer wall of the inner exhaust pipe 2 to support one end of the outer exhaust pipe 1; a fastening assembly is also included; a semi-circular hole is opened on the outer wall of the outer exhaust pipe 1 near the limiting boss 21 The exhaust pipe semicircular ring 7 is mounted on the outer wall of the outer exhaust pipe 1 in an arc-shaped groove. The stepped structure of the exhaust pipe semicircular ring 7 is locked in the groove. The horizontal section of the exhaust pipe semicircular ring 7 is in close contact with the outer wall of the outer exhaust pipe 1 and the radial end surface of the limiting boss. The vertical portion of the L-shaped section 73 of the exhaust pipe semicircular ring 7 is in close contact with the rear portion of the limiting boss 21. The exhaust pipe clamping ring 8 is mounted on the outer wall of the inner exhaust pipe 2, and the extended section 81 of the exhaust pipe clamping ring 8 is mounted on the outer side of the horizontal portion of the L-shaped section 73 of the exhaust pipe semicircular ring 7. The exhaust pipe bushing 3 is also provided with a retaining ring 4 located inside the inner exhaust pipe 2. The inner wall of the inner exhaust pipe 2 has a groove, and the retaining ring 4 is partially embedded in the groove to retain one end of the inner exhaust pipe bushing 3.

[0028] Example 4

[0029] The exhaust pipe clamping ring 8 and the inner exhaust pipe 2 are in interference fit.

[0030] During actual installation, the exhaust pipe clamping ring is supported by the reducer housing, thereby further ensuring that the clamping ring is installed firmly and that the various components of the exhaust pipe do not fall off or move.

[0031] The original exhaust pipe component structure is as follows Figure 1 As shown, it consists of an inner exhaust pipe, an outer exhaust pipe, an exhaust pipe bushing, a retaining ring and the first and second sealing rings. During assembly, the inner exhaust pipe is matched with the outer exhaust pipe and the exhaust pipe bushing respectively, and the matching surface is required to meet the air tightness test under an air pressure of 0.5MPa and the strength test under a hydraulic pressure of 4MPa. Only after the exhaust pipe strength and air tightness tests meet the requirements can it participate in the assembly of the reducer and the power test of the power unit. As can be seen from the figure, the inner exhaust pipe and the outer exhaust pipe are not firmly connected, and it is easy to fall off during assembly, damaging parts; it is easy to move during the test, resulting in the penetration of air and water lines, and the penetration of air and water lines and lubricating oil lines, causing the reducer and the related parts of the connected engine, fuel pump, and lubricating oil pump to be scrapped. Repeated processing of parts consumes a lot of time and cost, affecting the test process, and it is urgent to improve its structure. The improved exhaust pipe component structure is as follows Figure 2 As shown in the figure, the above problem can be effectively solved by designing a new fixing device (exhaust pipe semi-circular ring and exhaust pipe clamp ring) and processing a new fixing groove on the outer exhaust pipe. Figure 3 、 4 、5.

[0032] Based on the research of the existing reducer structure, combined with the actual situation and after consultation with relevant departments, the present invention has completed the structural improvement of the exhaust pipe components and designed the exhaust pipe semi-circular ring and the exhaust pipe clamp ring. The improved exhaust pipe components are as follows Figure 2 As shown, a semicircular exhaust pipe ring is added to the original structure (the structure is as shown Figure 3 and 4 ) and exhaust pipe clamp ring (structure such as Figure 5 During assembly, first install the inner exhaust pipe, outer exhaust pipe, exhaust pipe bushing, retaining ring and sealing ring in the exhaust pipe components, then install the exhaust pipe semi-circular ring and exhaust pipe clamp ring in the matching parts of the inner and outer exhaust pipes respectively to complete the assembly of the entire component. Then carry out subsequent airtightness and strength tests. After passing the test, participate in the assembly of the reducer and power unit, and then participate in the completion of the power test.

[0033] At present, the improvement measures have been implemented on the drawings, and the new parts have been produced according to the design drawings and applied to the products. After multiple disassembly and assembly and test verification, the original structural design defects have been effectively solved, and the tight connection of the inner and outer exhaust pipes has been ensured, thereby ensuring the assembly safety and reliable operation of the entire component.

Claims

1. A reducer exhaust pipe, comprising an outer exhaust pipe (1), an inner exhaust pipe (2) sleeved inside the outer exhaust pipe (1), and an exhaust pipe bushing (3) sleeved inside the inner exhaust pipe (2); a first sealing ring (5) is fixed between the inner and outer exhaust pipes, and a second sealing ring (6) is fixed between the inner exhaust pipe (2) and the exhaust pipe bushing (3); an annular limiting boss (21) is provided on the outer wall of the inner exhaust pipe (2) to support one end of the outer exhaust pipe (1); characterized in that, Also included is a fastening assembly; the fastening assembly includes an exhaust pipe semicircular ring (7) and an exhaust pipe clamping ring (8); the cross section of the exhaust pipe semicircular ring (7) is a horizontal section (71) and an L-shaped section (73) connected to one end of the horizontal section (71); the other end of the horizontal section (73) extends downward to form a step structure (72), and one end of the horizontal section (71) is connected to the top of the vertical portion of the L-shaped section (73); the exhaust pipe clamping ring (8) is a circular ring structure, and one side of the circular ring structure extends horizontally along the axial direction to form an extension section (81); the inner diameter of the exhaust pipe clamping ring (8) is 89 mm and the outer diameter is 94 mm , with a width of 10.9 mm; a semicircular slot is provided on the outer wall of the outer exhaust pipe (1) near the limiting boss (21); the exhaust pipe semicircular ring (7) is sleeved on the outer wall of the outer exhaust pipe (1); the step structure of the exhaust pipe semicircular ring (7) is clamped in the slot; the horizontal section of the exhaust pipe semicircular ring (7) is in close contact with the outer wall of the outer exhaust pipe (1); the vertical section of the L-shaped section (73) of the exhaust pipe semicircular ring (7) is in close contact with the rear of the limiting boss (21); the exhaust pipe clamping ring (8) is sleeved on the outer wall of the inner exhaust pipe (2) and the extension section (81) of the exhaust pipe clamping ring (8) is sleeved on the outer side of the horizontal section of the L-shaped section (73) of the exhaust pipe semicircular ring (7).

2. A reducer exhaust pipe according to claim 1, characterized in that: The exhaust pipe clamping ring (8) and the inner exhaust pipe (2) are in interference fit.

3. A reducer exhaust pipe according to claim 1 or 2, characterized in that: It also includes a retaining ring (4) located inside the inner exhaust pipe (2); a groove is formed on the inner wall of the inner exhaust pipe (2), and the retaining ring (4) is partially embedded in the groove and limits one end of the inner exhaust pipe bushing (3).

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