Mounting and positioning tool and method for intermediate gear of marine low-speed two-stroke diesel engine

Abstract

A marine low-speed two-stroke diesel engine intermediate gear mounting and positioning tool and method, a marine low-speed two-stroke diesel engine comprises an oil supply unit, an intermediate gear and an intermediate shell, the intermediate gear is mounted in the intermediate shell and meshed with an intermediate series gear of the oil supply unit, the front portion of the intermediate gear protrudes out of the front side face of the intermediate shell, and the rear portion of the intermediate gear protrudes out of the rear side face of the intermediate shell. The installation positioning tool comprises a left connecting plate, a right connecting plate, a supporting block and a positioning piece and is fixedly installed on the front side face of the middle shell. And measuring the gap and the parallelism between the positioning piece for installing the positioning tool and the gear teeth of the intermediate gear by using a feeler gauge, and adjusting the assembly position between the intermediate gear and the intermediate shell until the technical requirements are met. The installation accuracy of the intermediate gear in the intermediate shell is guaranteed, the efficiency of intermediate series gear clearance adjustment operation is improved, the repair probability of the intermediate shell and the oil supply unit is reduced, and the effects of improving the operation efficiency and guaranteeing the production schedule are achieved.

Description

Technical Field

[0001] The invention relates to an assembly process of a marine diesel engine, in particular to an installation and positioning tool and method for an intermediate gear of a marine low-speed two-stroke diesel engine, and belongs to the technical field of marine diesel engine manufacturing. Background Art

[0002] There are many gear transmission mechanisms on low-speed two-stroke marine diesel engines, and the meshing clearance and precision requirements of the gears are very high. Figure 1 The intermediate gear 02 of the marine low-speed two-stroke diesel engine is arranged at the bottom of the intermediate housing 01. The meshing accuracy requirement of the intermediate gear 02 and the intermediate series gears of the oil supply unit is also very high. If the intermediate gear 02 is out of tolerance during the installation and clearance adjustment process, the gear clearance between it and the intermediate series gears of the oil supply unit will not meet the requirements of the drawing, and the intermediate housing 01 and the oil supply unit need to be repaired, which not only affects the installation and production progress on site, but also seriously affects the completion of the overall production plan.

[0003] In order to ensure the efficiency of the clearance adjustment between the intermediate gear 02 and the intermediate series gears of the oil supply unit and reduce the probability of rework of the intermediate housing 01 and the oil supply unit, it is necessary to ensure the accuracy of the assembly of the intermediate gear 02 in the intermediate housing 01, and then adjust the accuracy of the gear clearance between the intermediate gear 02 and the intermediate series gears of the oil supply unit by adjusting the position of the intermediate housing 02. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an installation and positioning tool and method for the intermediate gear of a marine low-speed two-stroke diesel engine, which utilizes tooling to inspect and ensure the accuracy of the installation of the intermediate gear in the intermediate housing, thereby creating conditions for improving the efficiency of the subsequent intermediate series gear clearance adjustment operation, reducing the probability of rework of the intermediate housing and the oil supply unit, and achieving the effect of improving operating efficiency and ensuring production progress.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A tool for installing and positioning an intermediate gear of a low-speed two-stroke marine diesel engine, the low-speed two-stroke marine diesel engine comprising an oil supply unit, an intermediate gear and an intermediate housing, the intermediate gear being installed inside the intermediate housing and meshing with the intermediate series gears of the oil supply unit, the front portion of the intermediate gear protruding from the front side of the intermediate housing; characterized in that the installation and positioning tool is welded by a left connecting plate, a right connecting plate, a support block and a positioning piece;

[0007] The left connecting plate and the right connecting plate are respectively fixed to the left and right sides of the front side of the intermediate housing; the positioning member is a rod member, which is horizontally arranged in front of the intermediate housing and is used to contact the tooth surface of the intermediate gear to measure the gap between the intermediate gear and the intermediate gear; one end of the positioning member is fixedly connected to the left connecting plate through the support block, and the other end is fixedly connected to the right connecting plate through another support block.

[0008] Furthermore, the left connecting plate and the right connecting plate are provided with mounting holes which are in the same position as the threaded holes on the intermediate shell.

[0009] Furthermore, the size of the installation and positioning tool is determined according to the technical requirements of the protrusion and horizontality of the intermediate gear extending out from the front side of the intermediate housing when the intermediate gear is correctly meshed with the intermediate series gears of the oil supply unit after assembly.

[0010] Furthermore, the data of the protrusion and levelness are determined by calculation according to the technical requirements of the drawings, or by actual measurement of the intermediate gears of other similar main machines that have been assembled and adjusted to meet the requirements.

[0011] Furthermore, the left connecting plate and the right connecting plate are made of Q235B, with a thickness of 30-50 mm, and the roughness requirement of the contact surface with the intermediate shell is Ra1.25.

[0012] Furthermore, the material of the positioning piece is Q235B, and the surface roughness requirement is Ra1.25.

[0013] Another technical solution of the present invention is:

[0014] A method for installing and positioning an intermediate gear of a low-speed two-stroke diesel engine for a ship using the above-mentioned installation and positioning tool comprises the following specific operating steps:

[0015] Step 1: obtaining data on the protrusion of the intermediate gear from the front side of the intermediate housing and the horizontality of the gear teeth in advance according to the technical requirements of the product, and manufacturing the installation positioning tool according to the data of the technical requirements;

[0016] Step 2, installing the intermediate gear in the intermediate housing;

[0017] Step 3, fixing the installation and positioning tool to the front side of the intermediate housing by fixing bolts;

[0018] Step 4, using a feeler gauge to measure the clearance and parallelism between the positioning piece of the installation positioning tool and the gear teeth of the intermediate gear;

[0019] Step 5: If the measurement result of step 4 does not meet the technical requirements of the product, adjust the assembly position between the intermediate gear and the intermediate housing until the technical requirements of the product are met.

[0020] Furthermore, the technical requirements of the product are a gap of ≤0.50 mm and a parallelism of ≤0.20 mm.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The intermediate gear is positioned using the installation positioning tool, and the protrusion of the intermediate gear and the parallelism of the gear teeth are adjusted at the same time, which provides an early guarantee for solving the subsequent adjustment of the clearance of the intermediate series gears and improves the operating efficiency of the adjustment of the clearance of the intermediate series gears.

[0023] The installation and positioning method ensures the accuracy of the installation of the intermediate gear and the intermediate housing, meets the accuracy requirements of the clearance adjustment of the intermediate series gears, and ensures the product quality.

[0024] The present invention reduces the probability of rework of the intermediate housing and the oil supply unit, greatly shortens the cycle of on-site gear clearance adjustment operations, and ensures the completion of production tasks.

[0025] In summary, the present invention ensures the accuracy of the installation of the intermediate gear in the intermediate housing, improves the efficiency of the intermediate series gear clearance adjustment operation, reduces the probability of rework of the intermediate housing and the oil supply unit, and achieves the effect of improving operation efficiency and ensuring production progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the installation diagram of the intermediate gear and the intermediate housing.

[0027] Figure 2 It is a schematic diagram of the installation positioning tool of the present invention.

[0028] Figure 3 It is the operating state diagram of the present invention.

[0029] In the figure, 01 is the intermediate housing, 02 is the intermediate gear, 1 is the positioning long plate, 2 is the tooling fixing bolt, 3 is the adjustment fixing block, 4 is the adjustment bolt, A is the intermediate housing and intermediate gear assembly, B is the installation positioning tool, and C is the fixing bolt. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention shall not be limited thereby.

[0031] The present invention is used for the installation of the intermediate gear of a low-speed two-stroke marine diesel engine. Figure 2The marine low-speed two-stroke diesel engine includes an intermediate gear 02 and an intermediate housing 01. The intermediate gear 02 is installed inside the intermediate housing 01 and meshes with the intermediate series gears of the oil supply unit. The front part of the intermediate gear 02 protrudes from the front side of the intermediate housing 01.

[0032] See also Figure 2 The installation and positioning tool includes a left connecting plate 1, a right connecting plate 2, a supporting block 3 and a positioning member 4.

[0033] The left connecting plate 1 and the right connecting plate 2 are respectively fixed to the left and right sides of the front side of the intermediate housing 01. The left connecting plate 1 and the right connecting plate 2 are provided with mounting holes that are in the same position as the threaded holes on the intermediate housing 01. The material of the left connecting plate 1 and the right connecting plate 2 is Q235B, and the roughness requirement of the contact surface with the intermediate housing 01 is 1.25. To ensure that there is no deformation during the welding process, the thickness is about 30-50mm. To adapt to the installation on the intermediate housing 01, the outer dimensions of the left connecting plate 1 are slightly different from those of the right connecting plate 2.

[0034] The positioning member 4 is a rod, horizontally arranged in front of the intermediate housing 01, one end of which is fixedly connected to the left connecting plate 1 through the support block 3, and the other end of which is fixedly connected to the right connecting plate 2 through another support block 3. The positioning member 4 is made of Q235B, with a surface roughness requirement of 1.25, and is used to contact the tooth surface of the intermediate gear 02 to measure the gap between the intermediate gear 02 and the intermediate gear 02.

[0035] The left connecting plate 1, the right connecting plate 2, the support block 3 and the positioning piece 4 are connected by welding to form an integral installation positioning tool, and the size thereof is determined according to the technical requirements of the protrusion and horizontality extending out of the front side of the intermediate housing 01 when the intermediate gear 02 is correctly meshed with the intermediate series gears of the oil supply unit after assembly.

[0036] The above-mentioned protrusion amount and horizontality can be determined by calculation according to the technical requirements of the drawings, or by actual measurement of other intermediate gears of the same main engine that have been assembled and adjusted to be qualified. The installation positioning tool can even be made on-site on the same main engine that has been assembled and adjusted to be qualified, in preparation for the implementation of the present invention in the subsequent installation operation of the intermediate gears of the same main engine.

[0037] The installation and positioning method of the intermediate gear of a low-speed two-stroke marine diesel engine of the present invention comprises the following specific steps, please refer to Figure 3 :

[0038] Step 1: The data of the protrusion of the intermediate gear 02 from the front side of the intermediate housing 01 and the horizontality of the gear teeth are obtained in advance according to the technical requirements of the product, and the installation and positioning tool B is welded and assembled according to the data of the technical requirements. In order to prevent the workpiece from being deformed during the welding process, the technical requirements for the welding process are clarified;

[0039] Step 2: confirm that the intermediate gear 02 and the intermediate housing 01 have been assembled as required to form the intermediate housing and intermediate gear assembly A;

[0040] Step 3: According to the technical requirements, the installation and positioning tool B is fixedly installed on the front side of the intermediate housing 01 by fixing bolts C;

[0041] Step 4: Use a feeler gauge to measure the clearance and parallelism between the positioning member 4 of the installation positioning tool B and the gear teeth of the intermediate gear 02. The clearance is required to be ≤0.50 mm and the parallelism is ≤0.20 mm.

[0042] Step 5: If the clearance cannot meet the requirements, adjust the assembly position between the intermediate gear 02 and the intermediate housing 01 until the technical requirements of clearance ≤ 0.50 mm and parallelism ≤ 0.20 mm are met, and the positioning and installation of the intermediate gear 02 in the intermediate housing 01 are completed.

[0043] After completing the positioning and installation of the intermediate gear 02 described above, install the oil supply unit of the main engine, and adjust the gap between the intermediate series gears and the intermediate gear 02. By fine-tuning the relative position of the oil supply unit, the gap between the intermediate series gears and the intermediate gear 02 meets the design requirements.

[0044] The installation and positioning method can not only improve the speed of installing the intermediate gear on site, but also prepare for the subsequent clearance adjustment of the intermediate series gears, improve the efficiency of the clearance adjustment of the intermediate series gears, and reduce the probability of rework of the intermediate housing and the oil supply unit during the clearance adjustment of the intermediate series gears.

[0045] The protection scope claimed by the present invention is not limited to the above-mentioned embodiments, but should also include other obvious changes and alternatives to the present invention.

Claims

1. A tool for installing and positioning an intermediate gear of a low-speed two-stroke marine diesel engine, the low-speed two-stroke marine diesel engine comprising an oil supply unit, an intermediate gear and an intermediate housing, the intermediate gear being installed inside the intermediate housing and meshing with the intermediate series gears of the oil supply unit, the front portion of the intermediate gear protruding from the front side of the intermediate housing; characterized in that: The installation and positioning tool is welded by a left connecting plate, a right connecting plate, a supporting block and a positioning piece; The left connecting plate and the right connecting plate are respectively fixed to the left and right sides of the front side of the intermediate housing; the positioning member is a rod member, which is horizontally arranged in front of the intermediate housing and is used to contact the tooth surface of the intermediate gear to measure the gap between the intermediate gear and the intermediate gear; one end of the positioning member is fixedly connected to the left connecting plate through the support block, and the other end is fixedly connected to the right connecting plate through another support block.

2. The installation and positioning tool for the intermediate gear of a low-speed two-stroke marine diesel engine according to claim 1, characterized in that: The left connecting plate and the right connecting plate are provided with mounting holes which are in the same position as the threaded holes on the intermediate shell.

3. The installation and positioning tool for the intermediate gear of a low-speed two-stroke marine diesel engine according to claim 1, characterized in that: The size of the installation and positioning tool is determined according to the technical requirements of the protrusion and levelness of the intermediate gear extending out of the front side of the intermediate housing when the intermediate gear is properly meshed with the intermediate series gear of the oil supply unit after assembly.

4. The installation and positioning tool for the intermediate gear of a low-speed two-stroke marine diesel engine according to claim 3, characterized in that: The data of the protrusion and levelness are determined by calculation according to the technical requirements of the drawings, or by actual measurement of the intermediate gears of other similar main machines that have been assembled and adjusted to meet the requirements.

5. The installation and positioning tool for the intermediate gear of a low-speed two-stroke marine diesel engine according to claim 1, characterized in that: The left connecting plate and the right connecting plate are made of Q235B, with a thickness of 30-50 mm, and the roughness requirement of the contact surface with the intermediate shell is Ra1.

25.

6. The installation and positioning tool for the intermediate gear of a low-speed two-stroke marine diesel engine according to claim 1, characterized in that: The material of the positioning piece is Q235B, and the surface roughness requirement is Ra1.

25.

7. A method for installing and positioning an intermediate gear of a low-speed two-stroke diesel engine for a ship using the installation and positioning tool of claim 1, characterized in that: The installation and positioning method includes the following specific operation steps: Step 1: obtaining data on the protrusion of the intermediate gear from the front side of the intermediate housing and the horizontality of the gear teeth in advance according to the technical requirements of the product, and manufacturing the installation positioning tool according to the data of the technical requirements; Step 2, installing the intermediate gear in the intermediate housing; Step 3, fixing the installation and positioning tool to the front side of the intermediate housing by fixing bolts; Step 4, using a feeler gauge to measure the clearance and parallelism between the positioning piece of the installation positioning tool and the gear teeth of the intermediate gear; Step 5: If the measurement result of step 4 does not meet the technical requirements of the product, adjust the assembly position between the intermediate gear and the intermediate housing until the technical requirements of the product are met.

8. The method for installing and positioning the intermediate gear of a low-speed two-stroke marine diesel engine according to claim 7, characterized in that: The technical requirements of the product are gap ≤ 0.50 mm and parallelism ≤ 0.20 mm.

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