CN113084492A - Thrust device for mounting main bearing cap of marine low-speed diesel engine - Google Patents
Thrust device for mounting main bearing cap of marine low-speed diesel engine Download PDFInfo
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- CN113084492A CN113084492A CN202110280939.8A CN202110280939A CN113084492A CN 113084492 A CN113084492 A CN 113084492A CN 202110280939 A CN202110280939 A CN 202110280939A CN 113084492 A CN113084492 A CN 113084492A
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- main bearing
- bearing cap
- hydraulic cylinder
- hydraulic
- inner hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
A thrust device for mounting a main bearing cap of a marine low-speed diesel engine comprises a main beam, a hydraulic cylinder, a hydraulic piston, an external thread block, a stud, a connecting rod, a cut-off valve and a release screw; the hydraulic cylinder is fixedly connected to the right end of the main beam and provided with an inner hole and an inner threaded hole, the hydraulic piston is arranged in the inner hole and forms clearance fit with the inner hole, the external thread block is connected into the inner threaded hole of the hydraulic cylinder, the inner hole is in clearance fit with the hydraulic piston, the stud is screwed at the right end of the main beam, the inner end face extends into the inner hole and is in contact with the end face of the small end of the hydraulic piston, the stop valve and the release screw are installed on the excircle of the large end of the hydraulic cylinder and are communicated with the inner hole, and the connecting; hydraulic oil pours into the pneumatic cylinder, applys horizontal expansion force to the upper portion of main bearing cap, makes the below size shrink, releases hydraulic oil behind the embedding frame, and the resilience force makes main bearing cap and frame form interference fit to accomplish the installation of main bearing cap on the frame. The invention improves the loading and unloading efficiency of the main bearing cap and reduces the processing cost.
Description
Technical Field
The invention relates to manufacturing process equipment of a marine low-speed diesel engine, in particular to a thrust device for mounting a main bearing cap of the marine low-speed diesel engine, and belongs to the technical field of diesel engine manufacturing.
Background
The engine base is a main component of a low-speed large diesel engine for a ship, and a main bearing cover and a main bearing seat of the engine base are main parts for bearing the rotation of a crankshaft. Referring to fig. 4, the main bearing cap 01 is an integral component formed by two flat columns on the left and right and an arched girder in the middle, and has an "H" shaped structure. The installation of the main bearing cover and the main bearing seat of the marine low-speed diesel engine is generally divided into two types of plane positioning and wedge positioning, the outer sides of the lower parts of two upright columns of the main bearing cover with the plane positioning are positioning surfaces matched with the inner sides of the main bearing seat, and the two types of positioning surfaces are in interference fit. The main bearing cover with the plane positioning function is simple to manufacture, the interference fit positioning mode is firm and reliable, and the processing, manufacturing and installing cost is greatly reduced. When the main bearing cap is installed, the characteristic that the disturbability deformation can occur is utilized, outward expansion force is applied to the upper half part of the main bearing cap, the overall dimension of the upper part of the main bearing cap is increased, the overall dimension of the lower part of the main bearing cap is reduced, the main bearing seat of the machine base is installed with the main bearing cap and the expansion force is cancelled, the lower dimension of the main bearing cap is recovered to the original shape by utilizing resilience force, and therefore the main bearing cap is in interference fit with the main bearing seat of the machine base by means of deformation restoring force, and the positioning clamp is embedded on the machine base.
Disclosure of Invention
The invention aims to solve the problem that cooling water enters a combustion chamber when a pre-combustion chamber of an oil sprayer is dismantled, and provides a thrust device for mounting a main bearing cover of a marine low-speed diesel engine.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a marine low-speed diesel engine main bearing thrust unit for lid installation, installs on the main bearing cap, its characterized in that: the thrust device comprises a main beam, a hydraulic cylinder, a hydraulic piston, an external thread block, a stud, a connecting rod, a cut-off valve and a release screw; the hydraulic cylinder is in a stepped cylindrical shape and is fixedly connected to the outer side of the right end of the main beam, the outer circle of the small end of the hydraulic cylinder is inserted into the mounting hole at the right end of the main beam, the big end is provided with an inner hole and an inner threaded hole, the hydraulic piston is a stepped round shaft and is arranged in the inner hole of the hydraulic cylinder, the circumference of the large end and the circumference of the small end of the hydraulic piston form clearance fit with the inner hole, the external thread block is connected in the internal thread hole of the hydraulic cylinder through threads, the inner hole of the external thread block is in clearance fit with the excircle of the hydraulic piston, the stud is screwed in the mounting hole at the right end of the main beam, the inner end face of the stud extends into the inner hole and is in contact with the end face of the small end of the hydraulic piston, the stop valve and the release screw are mounted on the excircle of the large end of the hydraulic cylinder and are communicated with the inner hole of the hydraulic cylinder, and the connecting rod is fixedly connected to the outer side of the left end of the main beam;
hydraulic oil is injected into the hydraulic cylinder, transverse expansion force is applied to the upper portion of the main bearing cap, the upper portion is expanded in size by means of the deformation characteristic of the main bearing cap, meanwhile, the lower portion is contracted in size, hydraulic oil is discharged after the main bearing cap is embedded into the machine base, the lower portion of the main bearing cap is recovered to be normal in size by means of deformation resilience force, interference fit is formed between the main bearing cap and the machine base, and therefore the main bearing cap is installed on the machine base.
Furthermore, the thrust device also comprises a lifting plate which is fixedly connected to the upper part of the main beam.
Furthermore, the connecting rod is a step shaft, an adjusting shim is clamped between the end face of the large end of the connecting rod and the outer side face of the left end of the main beam, and the thickness of the adjusting shim is determined according to the gap of the thrust device mounted on the upper portion of the main bearing cover.
Furthermore, round ends are arranged on the outer side of the connecting rod and the outer side of the hydraulic piston.
Further, the connecting rod and the hydraulic piston are located on the same axis.
Furthermore, the circumference of the large end and the circumference of the small end of the hydraulic piston form clearance fit with an inner hole of the hydraulic cylinder, and the hydraulic cylinder is sealed in the cavity through a gasket and a sealing ring respectively.
Further, the hydraulic cylinder, the hydraulic piston, the external thread block, the stud, the connecting rod and the release screw are made of CrMoA alloy structural steel and subjected to quenching and tempering treatment.
Compared with the prior art, the invention has the following beneficial technical effects:
1) thrust device makes the main bearing cap take place the disturbed deformation and installs through applying the tensile force of hydraulic oil, has characteristics such as sound construction, stability is strong, the installation is convenient.
2) The invention greatly improves the mounting and dismounting efficiency of the main bearing cap and effectively reduces the processing and manufacturing cost.
Drawings
Fig. 1 is a schematic structural view (pressure ejection state) of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is an enlarged view of a portion a of fig. 1.
Fig. 4 is a use state diagram of the present invention.
FIG. 5 is a schematic view of the present invention (initial state of pressure release)
In the figure, 01-main bearing cap, 02-thrust device, 1-main beam, 2-hydraulic cylinder, 3-hydraulic piston, 4-external thread block, 5-stud, 6-connecting rod, 7-adjusting shim, 8-lifting plate, 9-nameplate, 10-pipe joint, 11-cut valve, 12-relief screw, 13-gasket, 14-gasket, 15-sealing ring, 16-sealing ring, 17-rivet, 18-bolt, 19-long bolt.
Detailed Description
The present invention is further illustrated in the following detailed description with reference to the figures and examples, which should not be construed as limiting the scope of the invention.
When the main bearing cover is installed, the thrust device for installing the main bearing cover of the marine low-speed diesel engine utilizes the characteristic of plastic deformation of the main bearing cover, exerts the force of hydraulic oil on the upper part of the main bearing cover transversely to expand the size of the upper part, contracts the lower part at the same time, then embeds the main bearing cover into the engine base, releases the hydraulic oil, and utilizes the deformation resilience force of the main bearing cover to restore the size of the lower part to be normal, thereby forming interference fit and enabling the main bearing cover to be clamped and installed on the engine base.
Referring to fig. 1 and 2 in combination, the thrust device includes: the main beam comprises a main beam 1, a hydraulic cylinder 2, a hydraulic piston 3, an external thread block 4, a stud 5, a connecting rod 6, a hoisting plate 8, a cut-off valve 11 and a release screw 12.
The main beam 1 is a rectangular frame member, and needs to have sufficient rigidity and strength as a main stressed base part of the thrust device, and needs to bear certain pressure in a hydraulic force application state.
The hydraulic cylinder 2 is in a stepped cylindrical shape, is fixedly connected to the outer side of the right end of the main beam 1 through a long bolt 19 and is in contact with the end face of the main beam 1. The outer circle of the small end of the hydraulic cylinder 2 is inserted into the mounting hole at the right end of the main beam 1 and forms clearance fit with the mounting hole, and the large end of the hydraulic cylinder 2 is provided with an inner hole and an inner threaded hole connected with the outer threaded block 4.
The hydraulic piston 3 is a stepped circular shaft and is arranged in an inner hole of the hydraulic cylinder 2, the large end circumference and the small end circumference of the hydraulic piston 3 are in clearance fit connection with the inner hole of the hydraulic cylinder 2, and the inner cavity is sealed through a gasket 13, a sealing ring 15, a gasket 14 and a sealing ring 16 respectively, please refer to fig. 3, so as to prevent hydraulic oil from leaking.
The external thread block 4 is connected with the large end of the hydraulic cylinder 2 through threads and is mainly used for fixedly sealing the large end of the hydraulic cylinder 2, and the rear end face of the screwed external thread block 4 needs to be flush with the end face of the hydraulic cylinder 2. And the inner hole of the external thread block 4 is in contact fit with the outer circle of the hydraulic piston 3.
The stud 5 is connected with a mounting hole at the right end of the main beam 1 through threads and is mainly used for fixedly sealing the small end of the hydraulic cylinder 2. When screwed in, the inner end surface of the stud 5 extends into the inner hole of the hydraulic cylinder 2 and needs to be in contact with the end surface of the small end of the hydraulic piston 3.
The cut-off valve 11 is installed on the excircle of the large end of the hydraulic cylinder 2 through a pipe joint 10, is communicated with the inner hole of the hydraulic cylinder 2, and is used for inputting hydraulic oil into the thrust device.
The discharge screw 12 is installed on the large-end excircle of the hydraulic cylinder 2, is communicated with the inner hole of the hydraulic cylinder 2, and is mainly used for discharging hydraulic oil.
The connecting rod 6 is a step shaft and is fixedly connected to the outer side of the left end of the main beam 1 through a long bolt 19, the outer circle of the small end of the connecting rod 6 is inserted into the mounting hole of the left end of the main beam 1 and is in clearance fit with the mounting hole, an adjusting gasket 7 is clamped between the end face of the large end of the connecting rod 6 and the outer side face of the left end of the main beam 1, and the thickness of the adjusting gasket 7 is determined according to the clearance of the thrust device mounted on the upper portion of the main bearing cover.
The connecting rod 6 and the hydraulic piston 3 are located on the same axis.
In order to avoid damaging the surfaces of the parts when hydraulic pressure is applied to the main bearing caps, the outer sides of the connecting rods 6 and the outer sides of the hydraulic pistons 3 are provided with rounded ends.
The lifting plate 8 is fixedly connected to the upper part of the main beam 1 through a bolt 18 and is mainly used for lifting the thrust device.
On the side of the main beam 1, a nameplate 9 is mounted through a rivet 17, and the content of the nameplate mainly comprises parameters such as working pressure, maximum pressure value and the like.
The hydraulic cylinder 2, the hydraulic piston 3, the external thread block 4, the stud 5, the connecting rod 6 and the discharge screw 12 all need to have enough strength and toughness, the manufacturing material is 42CrMoA alloy structural steel, and quenching and tempering are needed.
Referring to fig. 1 and 2, the installation process of the thrust device is as follows:
1) the excircle of the hydraulic cylinder 2 is respectively provided with a pipe joint 10, a cut-off valve 11 and a discharge screw 12; the inner bore of the hydraulic cylinder 2 is sequentially provided with gaskets 13 and 14, sealing rings 15 and 16, a hydraulic piston 3 and an external thread block 4.
2) After the installation is finished, the hydraulic cylinder 2 and the main beam 1 are connected into a whole through the long bolt 19.
3) The stud 5 is screwed into the main beam 1, and the inner end surface of the stud is contacted with the small end surface of the hydraulic cylinder 2.
4) And installing the adjusting gasket 7, and installing the connecting rod 6 through the long bolt 19 to enable the adjusting gasket 7 and the connecting rod 6 to be integrated with the main beam 1.
5) The lifting plate 8 is mounted by bolts 18 and the nameplate 9 is mounted by rivets 17. And the whole thrust device is installed.
Referring to fig. 4, the working process of the present invention is as follows:
connecting a stop valve 11 by using a quick connector, inputting hydraulic oil, referring to fig. 5, enabling the hydraulic oil to enter a sealed cavity formed by a hydraulic cylinder 2 and a hydraulic piston 3, filling the cavity with the hydraulic oil through certain working pressure, and applying pressure to two ends of the cavity, referring to fig. 1, so that the sizes of two ends of a whole thrust device 02 are increased, an upper part of a main bearing seat 01 is jacked up, a lower part of the main bearing seat is deformed and contracted, and the lower part of the main bearing seat 01 is smoothly clamped in a machine base; after the installation and seating are finished, the discharge screw 12 is removed, so that the pressure of the hydraulic cylinder 2 is released, the main bearing cap 01 is elastically restored to the original size by the plastic deformation of the main bearing cap, and the positioning is firm.
Practice proves that the hydraulic oil pressure is utilized for plastic deformation installation of the main bearing cap, the hydraulic oil pressure-based bearing cap mounting structure has the characteristics of convenience in installation, firm structure, strong stability and the like, in the installation process of the main bearing cap with plane positioning, the installation and disassembly efficiency of the main bearing cap is greatly improved, and the processing and manufacturing cost is effectively reduced.
Claims (7)
1. The utility model provides a marine low-speed diesel engine main bearing thrust unit for lid installation, installs on the main bearing cap, its characterized in that: the thrust device comprises a main beam, a hydraulic cylinder, a hydraulic piston, an external thread block, a stud, a connecting rod, a cut-off valve and a release screw; the hydraulic cylinder is in a stepped cylindrical shape and is fixedly connected to the outer side of the right end of the main beam, the outer circle of the small end of the hydraulic cylinder is inserted into the mounting hole at the right end of the main beam, the big end is provided with an inner hole and an inner threaded hole, the hydraulic piston is a stepped round shaft and is arranged in the inner hole of the hydraulic cylinder, the circumference of the large end and the circumference of the small end of the hydraulic piston form clearance fit with the inner hole, the external thread block is connected in the internal thread hole of the hydraulic cylinder through threads, the inner hole of the external thread block is in clearance fit with the excircle of the hydraulic piston, the stud is screwed in the mounting hole at the right end of the main beam, the inner end face of the stud extends into the inner hole and is in contact with the end face of the small end of the hydraulic piston, the stop valve and the release screw are mounted on the excircle of the large end of the hydraulic cylinder and are communicated with the inner hole of the hydraulic cylinder, and the connecting rod is fixedly connected to the outer side of the left end of the main beam;
hydraulic oil is injected into the hydraulic cylinder, transverse expansion force is applied to the upper portion of the main bearing cap, the upper portion is expanded in size by means of the deformation characteristic of the main bearing cap, meanwhile, the lower portion is contracted in size, hydraulic oil is discharged after the main bearing cap is embedded into the machine base, the lower portion of the main bearing cap is recovered to be normal in size by means of deformation resilience force, interference fit is formed between the main bearing cap and the machine base, and therefore the main bearing cap is installed on the machine base.
2. The thrust unit for mounting the main bearing cap of the marine low-speed diesel engine according to claim 1, wherein: the thrust device also comprises a lifting plate which is fixedly connected to the upper part of the main beam.
3. The thrust unit for mounting the main bearing cap of the marine low-speed diesel engine according to claim 1, wherein: the connecting rod is a step shaft, an adjusting shim is clamped between the end face of the large end of the connecting rod and the outer side face of the left end of the main beam, and the thickness of the adjusting shim is determined according to the gap of the thrust device arranged at the upper part of the main bearing cover.
4. The thrust unit for mounting the main bearing cap of the marine low-speed diesel engine according to claim 1, wherein: round ends are arranged on the outer side of the connecting rod and the outer side of the hydraulic piston.
5. The thrust unit for mounting the main bearing cap of the marine low-speed diesel engine according to claim 1, wherein: the connecting rod and the hydraulic piston are positioned on the same axis.
6. The thrust unit for mounting the main bearing cap of the marine low-speed diesel engine according to claim 1, wherein: the large end circumference and the small end circumference of the hydraulic piston form clearance fit with the inner hole of the hydraulic cylinder, and the cavity is sealed through a gasket and a sealing ring respectively.
7. The thrust unit for mounting the main bearing cap of the marine low-speed diesel engine according to claim 1, wherein: the hydraulic cylinder, the hydraulic piston, the external thread block, the stud, the connecting rod and the release screw are made of CrMoA alloy structural steel and subjected to thermal refining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110280939.8A CN113084492A (en) | 2021-03-16 | 2021-03-16 | Thrust device for mounting main bearing cap of marine low-speed diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110280939.8A CN113084492A (en) | 2021-03-16 | 2021-03-16 | Thrust device for mounting main bearing cap of marine low-speed diesel engine |
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| Publication Number | Publication Date |
|---|---|
| CN113084492A true CN113084492A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110280939.8A Pending CN113084492A (en) | 2021-03-16 | 2021-03-16 | Thrust device for mounting main bearing cap of marine low-speed diesel engine |
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| CN (1) | CN113084492A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203141047U (en) * | 2013-04-12 | 2013-08-21 | 南车戚墅堰机车有限公司 | Device for opening diesel engine block in propelling mode |
| CN203527382U (en) * | 2013-11-25 | 2014-04-09 | 广西玉柴机器股份有限公司 | Auxiliary tool for main bearing cover of engine |
| CN204061573U (en) * | 2014-07-09 | 2014-12-31 | 沪东重机有限公司 | A kind of mounting structure of low-speed diesel engine bearing cap |
| KR101595892B1 (en) * | 2014-12-05 | 2016-02-19 | (주)원창 | Apparatus for demounting and mounting of roll bearing |
| KR102183202B1 (en) * | 2019-07-08 | 2020-12-28 | 이용재 | Disassembling and assembling device for wheel bearings |
| CN112428214A (en) * | 2020-11-09 | 2021-03-02 | 上海中船三井造船柴油机有限公司 | Tool and method for mounting main bearing cap of dual-fuel diesel engine base |
-
2021
- 2021-03-16 CN CN202110280939.8A patent/CN113084492A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203141047U (en) * | 2013-04-12 | 2013-08-21 | 南车戚墅堰机车有限公司 | Device for opening diesel engine block in propelling mode |
| CN203527382U (en) * | 2013-11-25 | 2014-04-09 | 广西玉柴机器股份有限公司 | Auxiliary tool for main bearing cover of engine |
| CN204061573U (en) * | 2014-07-09 | 2014-12-31 | 沪东重机有限公司 | A kind of mounting structure of low-speed diesel engine bearing cap |
| KR101595892B1 (en) * | 2014-12-05 | 2016-02-19 | (주)원창 | Apparatus for demounting and mounting of roll bearing |
| KR102183202B1 (en) * | 2019-07-08 | 2020-12-28 | 이용재 | Disassembling and assembling device for wheel bearings |
| CN112428214A (en) * | 2020-11-09 | 2021-03-02 | 上海中船三井造船柴油机有限公司 | Tool and method for mounting main bearing cap of dual-fuel diesel engine base |
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Application publication date: 20210709 |