Main bearing seat of marine low-speed diesel engine

Abstract

The utility model relates to the technical field of main bearing seats, and discloses a marine low-speed diesel engine main bearing seat which comprises a bearing seat shell, lifting pins are arranged on the two sides of the upper end of the bearing seat shell, a side plate is arranged on the rear side of the lower end of the bearing seat shell, and the side plate and the bearing seat shell are welded and fixed. A lifting plate is arranged on the front side of the lower end of the bearing seat shell, and the lifting plate and the bearing seat shell are welded and fixed; the adjusting screws are arranged at the upper ends of the side plates and the lifting plates and are connected with the side plates and the lifting plates through threads in a matched mode, and adjusting gaskets are arranged at the positions, located at the lower ends of the side plates and the lifting plates, of the lower end of the bearing seat shell; the positioning pin is arranged at the upper end of the lifting plate, and the positioning pin is mounted in the lifting plate through punching; and the fixing bolts are arranged in the upper ends of the side plates and the lifting plate. According to the utility model, the positioning of the positioning pin is matched with the adjustment of the adjusting shim and the adjusting screw, so that the bearing seat is more convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of main bearing seats, in particular to a main bearing seat of a low-speed marine diesel engine. Background Art

[0002] The main bearing seat of a low-speed marine diesel engine is located inside the engine base, on which the main bearing is placed to support and fix the crankshaft. Each main bearing is connected to a lubricating oil pipeline. When the diesel engine is working normally, an oil film will be established between the rotating crankshaft and the bearing to ensure effective lubrication of the crankshaft. If the bearing load exceeds the limit and destroys the establishment of the oil film, it will cause shaft diameter strain or dry grinding overheating. In severe cases, the high temperature of friction will bring the risk of fire. Usually, since the front end of the diesel engine needs to be equipped with a frequency modulation wheel or a torsional vibration damper, the bearing load of the first main bearing (main bearing No. 1) located at the front end of the diesel engine is a position that needs special consideration during design.

[0003] As the requirements for ship economy and energy efficiency become higher and higher, the design of ship propulsion shafting has also undergone new changes. In most cases, in order to meet the requirements of shafting torsional vibration, the front end of the diesel engine needs to be equipped with a larger and heavier frequency modulation wheel or torsional vibration damper, which directly causes the bearing load of the No. 1 main bearing to exceed the limit value. In order to avoid this problem, the concept of the No. 0 main bearing is introduced at the front end of the diesel engine, that is, an extension shaft is added to the front end of the crankshaft, and the bearing load of the No. 1 main bearing is shared by the specially designed No. 0 main bearing, as shown below. Figure 4 As shown. Limited by the space and structure of the front end of the diesel engine, the design of the zero main bearing is different from the conventional main bearing structure and cannot be directly arranged on the engine base. It needs to be fixed with the help of the front cover of the diesel engine. At the same time, it is also necessary to consider the convenience of bearing centering and clearance adjustment during installation. Therefore, a main bearing seat for a marine low-speed diesel engine is proposed. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the utility model provides a main bearing seat of a low-speed marine diesel engine to solve the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model provides the following technical solution: a main bearing seat of a low-speed marine diesel engine, comprising:

[0008] A bearing seat housing, wherein both sides of the upper end of the bearing seat housing are provided with ejector pins, a side plate is provided at the rear side of the lower end of the bearing seat housing, and the side plate is welded and fixed to the bearing seat housing, and a hanging plate is provided at the front side of the lower end of the bearing seat housing, and the hanging plate is welded and fixed to the bearing seat housing;

[0009] An adjusting screw is arranged at the upper end of the side plate and the hanging plate, and the adjusting screw is connected with the side plate and the hanging plate through threaded cooperation, and an adjusting gasket is arranged at the lower end of the bearing seat housing located at the lower end of the side plate and the hanging plate;

[0010] A positioning pin is arranged at the upper end of the hanging plate, and the positioning pin is installed inside the hanging plate by punching a hole;

[0011] The fixing bolts are arranged inside the upper ends of the side panels and the hanging panels.

[0012] Preferably, the bearing seat shell is made of the same material as other main bearing seats of the oil production machine, and the material of the bearing seat shell is S17F.

[0013] Preferably, fixing screw holes are provided inside the upper ends of the hanging plate and the side plates, and the fixing screw holes are integrally formed with the hanging plate and the side plates, and the fixing screw holes are used for installing hand-tightened bolts.

[0014] Preferably, a protective shell is provided on the outside of the upper ends of the hanging plate and the side plate, and the protective shell is used to protect the fixing bolts and the adjusting screws.

[0015] Preferably, a hand-tightening bolt is installed inside the protective shell, and the hand-tightening bolt is rotatably connected to the protective shell, and the hand-tightening bolt is adapted to the fixing screw hole.

[0016] Preferably, a sealing gasket is provided at the lower end of the protective shell and is fixedly connected to the protective shell. The sealing gasket improves the sealing between the protective shell and the hanging plate and the side plate, thereby protecting the fixing bolts and adjusting screws from being affected by dust particles and rust.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model provides a main bearing seat of a low-speed marine diesel engine, which has the following beneficial effects:

[0019] The adjusting screws on the hanging plate and the side plate of the utility model are used to adjust the installation clearance of the four feet of the bearing seat. After the clearance adjustment meets the requirements, the adjusting gasket is processed to the installation clearance, and then the adjusting screw is replaced by the adjusting gasket, and it is installed and fastened with the fixing bolt, and finally a locating pin is punched and installed together with the front end cover shell at the bottom of the bearing seat. The installation and adjustment method of the locating pin, the adjusting gasket and the adjusting screw will make the installation and adjustment accurate and convenient, thereby solving the problems raised in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional diagram of the bearing housing structure of the utility model;

[0021] Figure 2 It is a three-dimensional diagram of the overall structure of the utility model;

[0022] Figure 3 This is a bottom view of the cover structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the existing main bearing installation status.

[0024] In the figure: 1. bearing seat housing; 2. hanging plate; 3. side plate; 4. positioning pin; 5. fixing bolt; 6. adjusting gasket; 7. adjusting screw; 8. fixing screw hole; 9. ejector pin; 10. protective shell; 11. hand-tightening bolt; 12. sealing gasket. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The utility model provides a technical solution, a main bearing seat of a low-speed marine diesel engine, see Figure 1 , Figure 2 and Figure 3 ,include:

[0027] A bearing housing 1, both sides of the upper end of the bearing housing 1 are provided with ejector pins 9, a side plate 3 is provided at the rear side of the lower end of the bearing housing 1, and the side plate 3 is welded and fixed to the bearing housing 1, and a hanging plate 2 is provided at the front side of the lower end of the bearing housing 1, and the hanging plate 2 is welded and fixed to the bearing housing 1;

[0028] The adjusting screw 7 is arranged at the upper end of the side plate 3 and the hanging plate 2, and the adjusting screw 7 is connected with the side plate 3 and the hanging plate 2 by threaded cooperation. The lower end of the bearing seat housing 1 is located at the lower end of the side plate 3 and the hanging plate 2 and is provided with an adjusting gasket 6;

[0029] A positioning pin 4 is provided at the upper end of the hanging plate 2, and the positioning pin 4 is installed inside the hanging plate 2 by punching a hole;

[0030] The fixing bolts 5 are arranged inside the upper ends of the side plates 3 and the hanging plates 2 .

[0031] See also Figure 1 and Figure 2 The bearing seat shell 1 is made of the same material as other main bearing seats of the oil production machine, and the material of the bearing seat shell 1 is S17F.

[0032] See also Figure 1 A fixing screw hole 8 is provided inside the upper end of the hanging plate 2 and the side plate 3, and the fixing screw hole 8 is integrally formed with the hanging plate 2 and the side plate 3, and the fixing screw hole 8 is used for installing the hand-tightening bolt 11.

[0033] See also Figure 1 and Figure 2 A protective shell 10 is provided on the outside of the upper ends of the hanging plate 2 and the side plate 3, and the protective shell 10 is used to protect the fixing bolts 5 and the adjusting screws 7.

[0034] See also Figure 1 , Figure 2 and Figure 3 A hand-tightening bolt 11 is installed inside the protective shell 10 , and the hand-tightening bolt 11 is rotatably connected to the protective shell 10 , and the hand-tightening bolt 11 is adapted to the fixing screw hole 8 .

[0035] See also Figure 3 A sealing gasket 12 is provided at the lower end of the protective shell 10, and the sealing gasket 12 is fixedly connected to the protective shell 10. The sealing gasket 12 improves the sealing performance between the protective shell 10 and the hanging plate 2 and the side plate 3, thereby protecting the fixing bolts 5 and the adjusting screws 7 from being affected by dust particles and rust.

[0036] This solution: Preparation before installation: put the machine base with crankshaft assembly on the platform, complete the horizontal adjustment of the machine base and tighten the connecting bolts; installation and adjustment of the expansion shaft: install two studs at the diagonal position of the free end face of the crankshaft, lift the expansion shaft and align it with the free end face of the crankshaft. Arrange an I-beam under the expansion shaft, and then use a magnetic bracket to place two dial indicators on the shaft diameter of the expansion shaft, one horizontal and one vertical, as shown below Figure 3As shown. Adjust the dial indicator to zero position and adjust the position of the expansion shaft until the runout is less than 0.15mm. Tighten the expansion shaft bolts symmetrically and drill to install the locating pin 4. Installation of the front cover: Apply sealant to the connection surface between the front cover and the base, lift the front lower cover to the installation position, put it in place and align the baffle flange with the base. Adjust the upper flange of the lower cover to be 0-1mm higher than the upper plane of the base. Install the fasteners between the cover and the base and install the locating pin 4. Installation and adjustment of the zero main bearing seat: Clean the bearing seat hole before installation, install the lower bearing shell and the pressure shoe screw, and keep the crankshaft of the #1 cylinder at the top dead center position of the diesel engine. Use two M12 lifting rings to lift the bearing seat and insert it between the expansion shaft and the front lower cover, then evenly tighten the four adjustment screws 7 until the lower bearing shell contacts the expansion shaft. Place a dial indicator on the top of the expansion shaft and continue to evenly tighten the four adjustment screws 7 until the dial indicator shows 0.05m. Measure the clearances a and b on both sides between the lower plane of the bearing seat and the support surface of the lower cover shell at the front end. If the two clearances are not equal, calculate their average value c = (a + b) / 2 + offset. According to the calculated value, process and adjust the gasket 6 to a thickness of c ± 0.05m. Then loosen the four adjustment screws 7 to disengage the bearing shell from the expansion shaft, and then evenly apply high-viscosity lubricating oil on the bearing shell and the shaft diameter of the expansion shaft. Arrange a hydraulic jack under the expansion shaft to lift the expansion shaft, and insert and adjust the processed adjustment gasket 6 into place after lifting the bearing seat with the four adjustment screws 7. Remove the four adjustment screws 7, loosen the hydraulic jack, drill holes at the bottom of the bearing seat to install the locating pin 4, and the bearing seat installation and adjustment are now complete. Then install the upper bearing shell, bearing cover, tighten the bolts, and install the lubricating oil pipe system.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A main bearing seat of a low-speed marine diesel engine, characterized in that: include: A bearing seat shell (1), wherein both sides of the upper end of the bearing seat shell (1) are provided with ejector pins (9), a side plate (3) is provided on the rear side of the lower end of the bearing seat shell (1), and the side plate (3) is welded and fixed to the bearing seat shell (1), and a hanging plate (2) is provided on the front side of the lower end of the bearing seat shell (1), and the hanging plate (2) is welded and fixed to the bearing seat shell (1); An adjusting screw (7) is arranged at the upper ends of the side plate (3) and the hanging plate (2), and the adjusting screw (7) is connected to the side plate (3) and the hanging plate (2) through threaded matching, and an adjusting gasket (6) is arranged at the lower end of the bearing seat housing (1) located at the lower end of the side plate (3) and the hanging plate (2); A positioning pin (4) is arranged at the upper end of the hanging plate (2), and the positioning pin (4) is installed inside the hanging plate (2) by punching a hole; The fixing bolts (5) are arranged inside the side plates (3) and the upper ends of the hanging plates (2).

2. A main bearing seat for a low-speed marine diesel engine according to claim 1, characterized in that: The material of the bearing seat housing (1) is S17F.

3. A main bearing seat for a low-speed marine diesel engine according to claim 1, characterized in that: Fixing screw holes (8) are provided inside the upper ends of the hanging plate (2) and the side plate (3), and the fixing screw holes (8) are integrally formed with the hanging plate (2) and the side plate (3).

4. A main bearing seat for a low-speed marine diesel engine according to claim 3, characterized in that: A protective shell (10) is arranged outside the upper ends of the hanging plate (2) and the side plate (3).

5. A main bearing seat for a low-speed marine diesel engine according to claim 4, characterized in that: A hand-tightening bolt (11) is installed inside the protective shell (10), and the hand-tightening bolt (11) is rotatably connected to the protective shell (10), and the hand-tightening bolt (11) is matched with the fixing screw hole (8).

6. A main bearing seat for a low-speed marine diesel engine according to claim 5, characterized in that: A sealing gasket (12) is provided at the lower end of the protective shell (10), and the sealing gasket (12) is fixedly connected to the protective shell (10).

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