CN223399062U - Diesel engine, engine main bearing and main bearing nut assembly - Google Patents
Diesel engine, engine main bearing and main bearing nut assemblyInfo
- Publication number
- CN223399062U CN223399062U CN202423000461.7U CN202423000461U CN223399062U CN 223399062 U CN223399062 U CN 223399062U CN 202423000461 U CN202423000461 U CN 202423000461U CN 223399062 U CN223399062 U CN 223399062U
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- CN
- China
- Prior art keywords
- main bearing
- bearing nut
- bolt
- nut assembly
- connecting bolt
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
本实用新型涉及柴油发动机技术领域，公开了一种柴油发动机、发动机主轴承和主轴承螺母组件，主轴承螺母组件包括主轴承螺母，主轴承螺母在中央螺纹孔外设有若干个用于安装连接螺栓的安装螺纹孔，当连接螺栓与主轴承螺母的接触面抵接时，旋拧锁紧连接螺栓以便使主轴承螺母拧紧。由于主轴承螺母的外侧设有若干个连接螺栓，可通过旋拧连接螺栓拧紧主轴承螺母，相比于直接旋拧主轴承螺母，各连接螺母所需的旋拧力矩较小，无需专用安装工具，可通过扳手等通用工具进行装卸，便于拆卸维修，显著降低了维修难度和劳动强度。
The utility model relates to the technical field of diesel engines and discloses a diesel engine, an engine main bearing, and a main bearing nut assembly. The main bearing nut assembly includes a main bearing nut. The main bearing nut is provided with a plurality of mounting threaded holes outside a central threaded hole for mounting connecting bolts. When the connecting bolts abut against a contact surface of the main bearing nut, the connecting bolts are tightened to tighten the main bearing nut. Because the main bearing nut is provided with a plurality of connecting bolts on the outside, the main bearing nut can be tightened by tightening the connecting bolts. Compared with directly tightening the main bearing nut, the tightening torque required for each connecting nut is smaller, and no special installation tools are required. Assembly and disassembly can be performed using common tools such as wrenches, making disassembly and maintenance easier and significantly reducing the difficulty and labor intensity of maintenance.
Description
Technical Field
The utility model relates to the technical field of diesel engines, in particular to a main bearing nut assembly. In addition, the utility model also relates to an engine main bearing comprising the main bearing nut assembly and a diesel engine comprising the main bearing.
Background
The main bearing nut of the diesel engine is usually a hexagon head nut or a hydraulic nut, and the friction force between the nut and the contact surface is utilized to fasten the workpiece during installation.
The marine diesel engine has high power and severe working condition, has higher design requirement on the main bearing nut, generally has a screwing torque of more than 1000 N.m, needs to use a special mounting tool such as a tightening machine or a hydraulic stretcher for loading and unloading, and cannot be tightened by manpower. However, the space of the cabin is limited, and the ship is not generally provided with the special installation tool, so that maintenance personnel can not easily assemble and disassemble the main bearing nut of the diesel engine.
In addition, the surface quality of the contact surface of the main bearing nut is unstable, so that the friction force of the contact surface is uneven, the torque is lost when the screwing torque is transmitted to the main bolt, the final screwing torque is unstable, and a certain installation hidden trouble exists.
In summary, how to conveniently and rapidly disassemble and assemble the main bearing nut of the diesel engine is a problem to be solved by those skilled in the art.
Disclosure of utility model
Therefore, the main bearing nut assembly is provided with the plurality of connecting bolts on the outer side of the main bearing nut, and the main bearing nut is screwed by screwing the connecting bolts, so that maintenance difficulty and labor intensity are reduced, and dismounting efficiency is improved.
In addition, the utility model also provides an engine main bearing comprising the main bearing nut assembly and a diesel engine comprising the engine main bearing.
In order to achieve the above object, the present utility model provides the following technical solutions:
The main bearing nut assembly comprises a main bearing nut, wherein a plurality of installation threaded holes for installing connecting bolts are arranged outside a central threaded hole of the main bearing nut, and when the connecting bolts are abutted with contact surfaces of the main bearing nut, the connecting bolts are screwed and locked so as to enable the main bearing nut to be screwed down.
Preferably, the mounting threaded holes are uniformly distributed along the circumferential direction of the main bearing nut, and the sizes of the mounting threaded holes are the same.
Preferably, the radius R' = (r+r)/2 of the concentric circle where the center of the installation threaded hole is located, where R is the outer diameter of the main bearing nut, and R is the inner diameter of the main bearing nut.
Preferably, a gap exists between the connecting bolt and a main bolt arranged in the central threaded hole, and the gap is larger than the minimum mounting distance of the connecting bolt.
Preferably, the connection bolt includes a socket head cap screw so as to be assembled and disassembled in a narrow space.
Preferably, the installation threaded hole is provided with a countersink and a threaded hole from top to bottom, the countersink is connected with the threaded hole through a positioning step surface, and the diameter of the positioning step surface is larger than or equal to the diameter of the bolt head of the connecting bolt.
Preferably, the main bearing further comprises a flat washer arranged between the main bearing nut and the contact surface, one end of the flat washer is abutted against the contact surface, and the other end of the flat washer is abutted against the connecting bolt.
Preferably, a spring washer or a lock washer is arranged between the bolt head of the connecting bolt and the main bearing nut.
An engine main bearing comprising a main bearing nut assembly as claimed in any preceding claim.
A diesel engine comprises the main bearing of the engine.
According to the main bearing nut assembly, the plurality of connecting bolts are arranged on the outer side of the main bearing nut, and the main bearing nut can be screwed by screwing the connecting bolts, so that compared with the main bearing nut which is directly screwed, screwing torque required by each connecting nut is smaller, a special mounting tool is not required, the main bearing nut assembly can be assembled and disassembled by using general tools such as a spanner, and is convenient to disassemble and maintain, and maintenance difficulty and labor intensity are remarkably reduced;
And the distortion of the main bolt can be reduced, and the whole service life of the main bearing nut assembly can be prolonged.
In addition, the utility model also provides an engine main bearing comprising the main bearing nut assembly and a diesel engine comprising the engine main bearing.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of a main bearing nut assembly provided by the present utility model;
FIG. 2 is a schematic top view of the main bearing nut assembly of FIG. 1;
FIG. 3 is a schematic cross-sectional view of a main bearing nut;
Fig. 4 is a schematic top view of the main bearing nut.
In fig. 1-4:
1-main bearing nut, 11-central threaded hole, 12-mounting threaded hole, 2-main bolt, 3-flat washer, 4-connecting bolt and 5-spring washer.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The main bearing nut assembly has the advantages that the main bearing nut assembly is characterized in that the main bearing nut assembly is provided with the plurality of connecting bolts on the outer side of the main bearing nut, and the main bearing nut is tightly screwed by screwing the connecting bolts, so that maintenance difficulty and labor intensity are reduced, and dismounting efficiency is improved.
In addition, the utility model also provides an engine main bearing comprising the main bearing nut assembly and a diesel engine comprising the engine main bearing.
The main bearing nut assembly provided by the utility model comprises a main bearing nut 1, wherein a plurality of mounting threaded holes 12 for mounting the connecting bolts 4 are arranged outside a central threaded hole 11 of the main bearing nut 1, and when the connecting bolts 4 are abutted with the contact surface of the main bearing nut 1, the connecting bolts 4 are screwed and locked so as to screw the main bearing nut 1.
Referring to fig. 3 and 4, a through central threaded hole 11 is provided in the center of the end face of the main bearing nut 1, the central threaded hole 11 is used for being in threaded connection with the main bolt 2, the main bolt 2 is usually a stud bolt, and the specific shape, structure and size of the central threaded hole 11 need to be checked and calculated according to the connection strength requirement of the main bearing in actual production;
In order to reduce the replacement cost of the fittings, the shape, structure and size of the central screw hole 11 of the main bearing nut 1 are generally set to be the same as those of the central screw hole 11 of the conventional main bearing nut 1.
The outside of the terminal surface of main bearing nut 1 is equipped with the installation screw hole 12 that link up, and installation screw hole 12 is used for with connecting bolt 4 threaded connection, and the quantity of installation screw hole 12 is two at least to reduce the required screwing moment of every connecting bolt 4 of screwing up, make things convenient for the maintenance personal to install and dismantle connecting bolt 4 through common universal tool such as spanner.
Since the main bearing nut 1 is screwed by screwing the connecting bolt 4, the tightening force applied to each place of the main bearing nut 1 is mainly related to the distribution and the size of the installation screw holes 12, and in order to make the tightening force applied to each direction of the main bearing nut 1 relatively uniform, the installation screw holes 12 are generally arranged to be uniformly distributed along the circumferential direction of the main bearing nut 1, and the sizes of the installation screw holes 12 are the same.
The specific number, structure, shape and size of the installation threaded holes 12 should be determined according to the requirements in actual production, such as the structural strength requirement of the main bearing nut 1, the maximum screwing moment provided by common general tools such as a spanner and the like, so as to ensure that the structural strength of the main bearing nut 1 is qualified, and maintenance personnel can install and detach the line-of-sight connecting bolt 4 through the common general tools such as the spanner and the like.
In order to install the connecting bolt 4, the main bearing nut 1 has a plurality of installation screw holes 12 as compared with the conventional main bearing nut 1, and in order to ensure the structural strength of the main bearing nut 1, the size of the main bearing nut 1 should be increased or the material strength of the main bearing nut 1 should be increased as appropriate.
The connecting bolt 4 can be arranged as an outer hexagon bolt or an inner hexagon bolt, the outer hexagon bolt is relatively convenient to screw, the inner hexagon bolt is smaller in required installation space, and the inner hexagon bolt is more suitable for being assembled in a narrow space.
When the connecting bolt 4 is set as an outer hexagon bolt, the bolt head of the outer hexagon bolt protrudes out of the end face of the main bearing nut 1, a gap needs to exist between the connecting bolt 4 and the main bolt 2 arranged in the central threaded hole 11, and the gap needs to be larger than the minimum installation distance of the connecting bolt 4;
The minimum mounting distance of the connecting bolt 4 is not a fixed value, and is determined with reference to spanner space standards or the like in particular, in relation to the size of the connecting bolt 4 and the general tool used.
And when the connecting bolt 4 is set to be an inner hexagon bolt, the installation space problem of the connecting bolt 4 does not need to be considered in the position of the installation threaded hole 12, and the connecting bolt 4 can be more conveniently assembled and disassembled in a narrow space.
When the main bearing nut 1 is assembled, the main bearing nut 1 is sleeved outside the main bolt 2, and the main bearing nut 1 is manually screwed, then each connecting bolt 4 sequentially penetrates into the installation threaded hole 12 of the main bearing nut 1, the connecting bolts 4 are pre-tightened by using a general tool such as a spanner according to a diagonal tightening method, and finally each connecting bolt 4 is screwed;
When the connecting bolt 4 abuts against the contact surface of the main bearing nut 1, continued tightening of the connecting bolt 4 can tighten the main bearing nut 1 outside the main bolt 2.
In the embodiment, the outer side of the main bearing nut 1 is provided with a plurality of connecting bolts 4, the main bearing nut 1 can be screwed by screwing the connecting bolts 4, compared with the main bearing nut 1 which is directly screwed, the screwing moment required by each connecting bolt 4 is smaller, a special installation tool is not required, the connecting bolts can be assembled and disassembled by using general tools such as a spanner, and the connecting bolts are convenient to detach and maintain, so that the maintenance difficulty and the labor intensity are remarkably reduced;
And the distortion of the main bolt 2 can be reduced, which is beneficial to prolonging the whole service life of the main bearing nut assembly.
In order to reduce the problem of stress concentration in the vicinity of both the central screw hole 11 and the mounting screw hole 12, it is preferable that a radius R' = (r+r)/2 of a concentric circle where the center of the mounting screw hole 12 is located, where R is the outer diameter of the main bearing nut 1 and R is the inner diameter of the main bearing nut 1, be provided.
By arranging the center of the installation threaded hole 12 at the 1/2 radius of the main bearing nut 1, the installation threaded hole 12 can be far away from the inner wall surface of the central threaded hole 11 and the outer wall surface of the main bearing nut 1, which is beneficial to reducing the local stress concentration phenomenon of the main bearing nut 1 and further ensuring the structural strength and reliability of the main bearing nut 1.
On the basis of the above embodiment, in order to prevent the connecting bolt 4 from protruding out of the main bolt 2 in the axial direction and affecting the installation of other parts in the engine, the installation threaded hole 12 may be provided with a countersink and a threaded hole from top to bottom, the countersink and the threaded hole are connected through a positioning step surface, and the diameter of the positioning step surface is greater than or equal to the bolt head diameter of the connecting bolt 4.
Because the size of the countersunk bolt hole is larger than that of the common bolt hole, the countersunk bolt hole has larger influence on the structural strength of the main bearing nut 1, and in order to ensure the self structural strength of the main bearing nut 1, when the installation threaded hole 12 is set as the countersunk bolt hole, the connecting bolt 4 is preferably set as an inner hexagon bolt, and the diameter of the positioning step surface only needs to be equal to or slightly larger than the diameter of the bolt head of the connecting bolt 4;
When the connecting bolt 4 is set as the outer hexagonal bolt, a certain installation space is required to be reserved between the countersunk hole of the installation threaded hole 12 and the connecting bolt 4 for smooth installation and disassembly of the connecting bolt 4.
In this embodiment, the installation threaded hole 12 is set to be a countersunk bolt hole, so that the bolt head of the connecting bolt 4 can be partially or completely hidden in the countersunk hole of the installation threaded hole 12, and the protruding bolt head of the connecting bolt 4 is prevented from affecting the installation of other parts in the engine.
In a specific implementation, referring to fig. 1 and 2, a flat washer 3 is arranged between a main bearing nut 1 and a contact surface of the main bearing nut assembly, one end of the flat washer 3 is abutted against the contact surface, and the other end of the flat washer 3 is abutted against a connecting bolt 4, so that the contact area of the connecting bolt 4, the main bearing nut 1 and the contact surface below is increased, and the pressure is reduced, and the service life is prolonged;
A spring washer 5 or a lock washer is provided between the bolt head of the connecting bolt 4 and the main bearing nut 1 so as to prevent the connecting bolt 4 from being loosened from the mounting threaded hole 12, the lock washer may include a lock washer and a lock washer, and the specific types and types of the spring washer 5 and the lock washer are determined according to the actual production needs with reference to the prior art, and will not be repeated herein.
In addition to the main bearing nut assembly, the present utility model further provides an engine main bearing including the main bearing nut assembly disclosed in the foregoing embodiment and a diesel engine including the engine main bearing, and the structure of the engine main bearing and other parts of the diesel engine are referred to in the prior art, and are not repeated herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The diesel engine, the engine main bearing and the main bearing nut assembly provided by the utility model are described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
Claims (10)
1. The main bearing nut assembly comprises a main bearing nut (1), and is characterized in that the main bearing nut (1) is provided with a plurality of installation threaded holes (12) for installing connecting bolts (4) outside a central threaded hole (11), and when the connecting bolts (4) are abutted with the contact surface of the main bearing nut (1), the connecting bolts (4) are screwed and locked so as to enable the main bearing nut (1) to be screwed.
2. The main bearing nut assembly according to claim 1, characterized in that the mounting threaded holes (12) are evenly distributed in the circumferential direction of the main bearing nut (1), and that the dimensions of each of the mounting threaded holes (12) are identical.
3. The main bearing nut assembly according to claim 2, characterized in that the radius R' = (r+r)/2 of the concentric circle where the centre of the mounting threaded bore (12) is located, wherein R is the outer diameter of the main bearing nut (1) and R is the inner diameter of the main bearing nut (1).
4. A main bearing nut assembly according to claim 3, characterized in that a gap exists between the connecting bolt (4) and a main bolt (2) provided in the central threaded bore (11), and that the gap is larger than the minimum mounting distance of the connecting bolt (4).
5. A main bearing nut assembly according to claim 3, characterized in that the connecting bolt (4) comprises a socket head cap bolt for handling the connecting bolt (4) in a small space.
6. The main bearing nut assembly according to any one of claims 1 to 5, characterized in that the mounting threaded hole (12) is provided with a counter bore and a threaded hole from top to bottom, the counter bore and the threaded hole being connected by a positioning step surface, the diameter of the positioning step surface being larger than or equal to the bolt head diameter of the connecting bolt (4).
7. A main bearing nut assembly according to any one of claims 1-5, further comprising a plain washer (3) provided between the main bearing nut (1) and the contact surface, one end of the plain washer (3) being in abutment with the contact surface, the other end of the plain washer (3) being in abutment with the connecting bolt (4).
8. Main bearing nut assembly according to any of claims 1-5, characterized in that a spring washer (5) or a lock washer is arranged between the bolt head of the connecting bolt (4) and the main bearing nut (1).
9. An engine main bearing comprising a main bearing nut assembly according to any one of claims 1 to 8.
10. A diesel engine comprising the engine main bearing of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423000461.7U CN223399062U (en) | 2024-12-05 | 2024-12-05 | Diesel engine, engine main bearing and main bearing nut assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202423000461.7U CN223399062U (en) | 2024-12-05 | 2024-12-05 | Diesel engine, engine main bearing and main bearing nut assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223399062U true CN223399062U (en) | 2025-09-30 |
Family
ID=97151020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202423000461.7U Active CN223399062U (en) | 2024-12-05 | 2024-12-05 | Diesel engine, engine main bearing and main bearing nut assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223399062U (en) |
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2024
- 2024-12-05 CN CN202423000461.7U patent/CN223399062U/en active Active
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