Diesel engine, engine main bearing and main bearing nut assembly

Abstract

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 comprises a main bearing nut, the main bearing nut is provided with a plurality of mounting threaded holes outside a central threaded hole, and the mounting threaded holes are used for mounting connecting bolts. When the connecting bolt abuts against the contact face of the main bearing nut, the connecting bolt is screwed and locked so that the main bearing nut can be tightened. As the plurality of connecting bolts are arranged on the outer side of the main bearing nut, the main bearing nut can be screwed by screwing the connecting bolts, compared with direct screwing of the main bearing nut, the screwing torque required by each connecting nut is small, a special mounting tool is not needed, and the connecting nuts can be assembled and disassembled through universal tools such as a wrench and are convenient to disassemble and maintain; and the maintenance difficulty and the labor intensity are obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and more specifically, to a main bearing nut assembly. In addition, the present invention also relates to an engine main bearing including the main bearing nut assembly and a diesel engine including the main bearing. Background Art

[0002] The main bearing nut of a diesel engine is usually set as a hexagonal nut or a hydraulic nut. During installation, the friction between the nut and the contact surface is used to tighten the workpiece.

[0003] Due to their high power and harsh operating conditions, marine diesel engines place higher demands on the design of their main bearing nuts. The tightening torque for main bearing nuts is generally above 1000 N·m, requiring specialized installation tools such as a tightening machine or hydraulic tensioner for installation and removal. Manual tightening is not possible. However, due to limited cabin space, these specialized installation tools are typically not available on board, making it difficult for maintenance personnel to remove and install the main bearing nuts of diesel engines.

[0004] In addition, the surface quality of the contact surface of the main bearing nut is unstable, resulting in uneven friction on the contact surface, causing torque loss when the tightening torque is transmitted to the main bolt, resulting in unstable final tightening torque and certain installation risks.

[0005] In summary, how to conveniently and quickly disassemble and assemble the main bearing nut of a diesel engine is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide a main bearing nut assembly, in which a plurality of connecting bolts are provided on the outside of the main bearing nut. The main bearing nut is tightened by screwing the connecting bolts, which reduces the maintenance difficulty and labor intensity and improves the disassembly and assembly efficiency.

[0007] In addition, the utility model also provides an engine main bearing including the main bearing nut assembly and a diesel engine including the engine main bearing.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] A 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 screwed and locked so that the main bearing nut is tightened.

[0010] Preferably, the mounting threaded holes are evenly distributed along the circumferential direction of the main bearing nut, and the sizes of the mounting threaded holes are the same.

[0011] Preferably, the radius of the concentric circle where the center of the mounting threaded hole is located is r'=(R+r) / 2, wherein R is the outer diameter of the main bearing nut, and r is the inner diameter of the main bearing nut.

[0012] Preferably, there is a gap between the connecting bolt and the main bolt provided in the central threaded hole, and the gap is greater than the minimum installation distance of the connecting bolt.

[0013] Preferably, the connecting bolts include hexagon socket bolts, so that the connecting bolts can be installed and removed in a narrow space.

[0014] Preferably, the mounting threaded hole is provided with a countersunk hole and a threaded hole from top to bottom, the countersunk hole and the threaded hole are connected by 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.

[0015] Preferably, it further comprises a flat washer provided between the main bearing nut and the contact surface, one end of the flat washer abuts against the contact surface, and the other end of the flat washer abuts against the connecting bolt.

[0016] Preferably, a spring washer or an anti-loosening washer is provided between the bolt head of the connecting bolt and the main bearing nut.

[0017] An engine main bearing comprises the main bearing nut assembly described in any one of the above items.

[0018] A diesel engine comprises the above-mentioned engine main bearing.

[0019] The main bearing nut assembly provided by the utility model has a plurality of connecting bolts provided on the outer side of the main bearing nut. The main bearing nut can be tightened by screwing the connecting bolts. Compared with directly screwing the main bearing nut, the screwing torque required for each connecting nut is smaller, and no special installation tools are required. It can be assembled and disassembled with general tools such as wrenches, which is convenient for disassembly and maintenance, and significantly reduces the difficulty and labor intensity of maintenance.

[0020] It can also reduce the torsion deformation of the main bolt, which is beneficial to extending the overall life of the main bearing nut assembly.

[0021] In addition, the utility model also provides an engine main bearing including the main bearing nut assembly and a diesel engine including the engine main bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 A schematic cross-sectional view of the main bearing nut assembly provided by the present invention;

[0024] Figure 2 for Figure 1 A schematic top view of a main bearing nut assembly;

[0025] Figure 3 is a schematic cross-sectional view of the main bearing nut;

[0026] Figure 4 Schematic diagram of the top view of the main bearing nut.

[0027] Figure 1-Figure 4 middle:

[0028] 1-Main bearing nut; 11-Central threaded hole; 12-Mounting threaded hole; 2-Main bolt; 3-Flat washer; 4-Connecting bolt; 5-Spring washer. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The core of the utility model is to provide a main bearing nut assembly, wherein a plurality of connecting bolts are provided on the outside of the main bearing nut. The main bearing nut is tightened by screwing the connecting bolts, which reduces the maintenance difficulty and labor intensity and improves the disassembly and assembly efficiency.

[0031] In addition, the utility model also provides an engine main bearing including the main bearing nut assembly and a diesel engine including the engine main bearing.

[0032] The main bearing nut assembly provided by the present invention includes a main bearing nut 1. The main bearing nut 1 is provided with a plurality of mounting threaded holes 12 outside a central threaded hole 11 for mounting connecting bolts 4. When the connecting bolts 4 abut against the contact surface of the main bearing nut 1, the connecting bolts 4 are screwed and locked so that the main bearing nut 1 is tightened.

[0033] Please refer to Figure 3 and Figure 4 A 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 threaded connection with the main bolt 2. The main bolt 2 is usually configured as a stud bolt. The specific shape, structure and size of the central threaded hole 11 need to be determined by calculation based on the connection strength requirements of the main bearing in actual production.

[0034] In order to reduce the cost of replacing accessories, the shape, structure and size of the central threaded hole 11 of the main bearing nut 1 are usually set to be the same as the shape, structure and size of the central threaded hole 11 of the existing main bearing nut 1.

[0035] A through mounting threaded hole 12 is provided on the outer side of the end face of the main bearing nut 1. The mounting threaded hole 12 is used for threaded connection with the connecting bolt 4. The number of the mounting threaded holes 12 is at least two, so as to reduce the tightening torque required to tighten each connecting bolt 4, making it convenient for maintenance personnel to install and remove the connecting bolt 4 using common general tools such as wrenches.

[0036] Since the main bearing nut 1 is tightened by screwing the connecting bolt 4, the tightening force applied to various parts of the main bearing nut 1 is mainly related to the distribution and size of the mounting threaded holes 12; in order to make the tightening force applied to all directions of the main bearing nut 1 relatively uniform, the mounting threaded holes 12 are usually arranged to be evenly distributed along the circumferential direction of the main bearing nut 1, and the sizes of each mounting threaded hole 12 are the same.

[0037] The specific number, structure, shape and size of the mounting threaded holes 12 should be calculated and determined based on actual production needs, such as the structural strength requirements of the main bearing nut 1 and the maximum tightening torque that can be provided by common general tools such as wrenches, so as to ensure that the structural strength of the main bearing nut 1 meets the requirements and that maintenance personnel can install and remove the connecting bolts 4 through line of sight using common general tools such as wrenches.

[0038] It should be noted that in order to install the connecting bolt 4, the main bearing nut 1 has several additional mounting threaded holes 12 compared to the existing main bearing nut 1. In order to ensure the structural strength of the main bearing nut 1, the size of the main bearing nut 1 should be increased as appropriate, or the material strength of the main bearing nut 1 should be improved.

[0039] The connecting bolt 4 can be set as either an external hexagonal bolt or an internal hexagonal bolt; the external hexagonal bolt is relatively easy to screw, while the internal hexagonal bolt requires less installation space and is more suitable for assembly in a narrow space.

[0040] When the connecting bolt 4 is configured as an external hexagonal bolt, the bolt head of the external hexagonal bolt protrudes from the end surface of the main bearing nut 1. A gap must exist between the connecting bolt 4 and the main bolt 2 provided in the central threaded hole 11. The gap must be greater than the minimum installation distance of the connecting bolt 4.

[0041] The minimum installation distance of the connecting bolt 4 is not a fixed value, but is related to the size of the connecting bolt 4 and the general tools used. The specific value can be determined by referring to the wrench space standard, etc.

[0042] When the connecting bolt 4 is configured as a hexagon socket bolt, the location of the threaded hole 12 does not need to consider the installation space of the connecting bolt 4, which is more conducive to installing and removing the connecting bolt 4 in a narrow space.

[0043] During assembly, first, place the main bearing nut 1 over the main bolt 2 and tighten it manually. Then, insert each connecting bolt 4 into the mounting threaded hole 12 of the main bearing nut 1 in sequence. Pre-tighten the connecting bolts 4 using a wrench or other general tool according to the diagonal tightening rule, and finally tighten each connecting bolt 4.

[0044] When the connecting bolt 4 abuts against the contact surface of the main bearing nut 1 , continuing to tighten the connecting bolt 4 can tighten the main bearing nut 1 onto the outside of the main bolt 2 .

[0045] In this embodiment, a plurality of connecting bolts 4 are provided on the outside of the main bearing nut 1. The main bearing nut 1 can be tightened by screwing the connecting bolts 4. Compared with directly screwing the main bearing nut 1, the screwing torque required for each connecting bolt 4 is smaller, and no special installation tools are required. Assembly and removal can be performed with common tools such as wrenches, which facilitates disassembly and maintenance, significantly reducing the difficulty and labor intensity of maintenance.

[0046] It can also reduce the torsional deformation of the main bolt 2, which is beneficial to extending the overall life of the main bearing nut assembly.

[0047] In order to reduce the stress concentration problem near the central threaded hole 11 and the mounting threaded hole 12, it is preferred to set the radius of the concentric circle where the center of the mounting threaded hole 12 is located to r'=(R+r) / 2, where R is the outer diameter of the main bearing nut 1 and r is the inner diameter of the main bearing nut 1.

[0048] By setting the center of the mounting threaded hole 12 at 1 / 2 radius of the main bearing nut 1, the mounting threaded hole 12 can be made farther 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 thereby ensuring the structural strength and reliability of the main bearing nut 1.

[0049] On the basis of the above embodiment, in order to prevent the connecting bolt 4 from protruding outside the main bolt 2 in the axial direction and affecting the installation of other components in the engine, a mounting threaded hole 12 can be provided with a countersunk hole and a threaded hole from top to bottom, and the countersunk hole and the threaded hole are connected by 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.

[0050] Since the volume of the countersunk bolt hole is larger than that of an ordinary bolt hole, the countersunk bolt hole has a greater impact on the structural strength of the main bearing nut 1. In order to ensure the structural strength of the main bearing nut 1, when the mounting threaded hole 12 is set as a countersunk bolt hole, it is preferred to set the connecting bolt 4 as a hexagon socket bolt. In this case, the diameter of the positioning step surface only needs to be equal to or slightly larger than the bolt head diameter of the connecting bolt 4.

[0051] When the connecting bolt 4 is configured as a hexagonal bolt, a certain installation space needs to be reserved between the countersunk hole of the mounting threaded hole 12 and the connecting bolt 4 for smooth installation and removal of the connecting bolt 4 .

[0052] In this embodiment, the mounting threaded hole 12 is set as a countersunk bolt hole, which can partially or completely hide the bolt head of the connecting bolt 4 in the countersunk hole of the mounting threaded hole 12, thereby preventing the protruding bolt head of the connecting bolt 4 from affecting the installation of other components in the engine.

[0053] In a specific implementation, please refer to Figure 1 and Figure 2 A flat washer 3 is provided between the main bearing nut 1 and the contact surface of the main bearing nut assembly. One end of the flat washer 3 abuts the contact surface, and the other end of the flat washer 3 abuts the connecting bolt 4, so as to increase the contact area between the connecting bolt 4, the main bearing nut 1 and the contact surface below, thereby reducing pressure and extending service life.

[0054] A spring washer 5 or an anti-loosening washer is provided between the bolt head of the connecting bolt 4 and the main bearing nut 1 to prevent the connecting bolt 4 from loosening from the mounting threaded hole 12. The anti-loosening washer may include a stop washer and a locking washer. The specific types and models of the spring washer 5 and the anti-loosening washer are determined according to the actual production needs with reference to the existing technology and will not be repeated here.

[0055] In addition to the above-mentioned main bearing nut assembly, the present invention also provides an engine main bearing including the main bearing nut assembly disclosed in the above-mentioned embodiment and a diesel engine including the above-mentioned engine main bearing. For the structures of the above-mentioned engine main bearing and other parts of the diesel engine, please refer to the prior art and will not be repeated in this article.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The diesel engine, engine main bearing, and main bearing nut assembly provided by the present invention have been described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may, without departing from the principles of the present invention, make various improvements and modifications to the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A main bearing nut assembly, comprising a main bearing nut (1), characterized in that: The main bearing nut (1) is provided with a plurality of mounting threaded holes (12) outside the central threaded hole (11) for mounting connecting bolts (4). When the connecting bolts (4) abut against the contact surface of the main bearing nut (1), the connecting bolts (4) are screwed and locked so that the main bearing nut (1) is tightened.

2. The main bearing nut assembly according to claim 1, characterized in that: The mounting threaded holes (12) are evenly distributed along the circumferential direction of the main bearing nut (1), and the sizes of the mounting threaded holes (12) are all the same.

3. The main bearing nut assembly according to claim 2, characterized in that: The radius of the concentric circle where the center of the mounting threaded hole (12) is located is r'=(R+r) / 2, 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. The main bearing nut assembly according to claim 3, characterized in that: There is a gap between the connecting bolt (4) and the main bolt (2) provided in the central threaded hole (11), and the gap is greater than the minimum installation distance of the connecting bolt (4).

5. The main bearing nut assembly according to claim 3, characterized in that: The connecting bolt (4) comprises a hexagon socket bolt, so that the connecting bolt (4) can be installed and removed in a narrow 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 countersunk hole and a threaded hole from top to bottom, the countersunk hole and the threaded hole are connected via 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).

7. The main bearing nut assembly according to any one of claims 1 to 5, characterized in that: It also includes a flat washer (3) provided between the main bearing nut (1) and the contact surface, one end of the flat washer (3) abutting against the contact surface, and the other end of the flat washer (3) abutting against the connecting bolt (4).

8. The main bearing nut assembly according to any one of claims 1 to 5, characterized in that: A spring washer (5) or an anti-loosening washer is provided between the bolt head of the connecting bolt (4) and the main bearing nut (1).

9. An engine main bearing, characterized in that: The main bearing nut assembly comprises the main bearing nut assembly according to any one of claims 1 to 8.

10. A diesel engine, characterized in that: Including the engine main bearing according to claim 9.

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