Novel main machine additional belt pulley
By designing the additional pulley of the new host, the problem of bolt torque exceeding the design value in the existing technology is solved, the stable operation and service life of the host are achieved, and the risk of breaking of the host crankshaft is avoided.
Patent Information
- Application Number
- CN202422674414.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-02
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-11-02
AI Technical Summary
The existing ship host design does not consider the function of towing pulleys, which causes pulleys to be attached by yourself when needed, which may cause the bolt torsion exceeding the design value, resulting in bolt breakage and main engine crankshaft breakage, affecting service life and reliability.
Design a new type of additional pulley for the main engine, including the installation flange and main engine crankshaft shock absorber, set up belt mounting bolt holes and mounting bolt holes, and ensure that the installation bolts are subject to no more than the design value by reducing the number of belt mounting bolt holes, avoiding bolt breakage, and adopting a connecting shaft and pulley structure to reduce the impact of inertia.
It effectively avoids bolt breakage and main machine crankshaft breakage, improves the service life and reliability of the main machine, avoids unpredictable faults, and ensures the stable operation of the pulley.
Smart Images
Figure CN223152701U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of marine main engines, in particular to a new type of additional pulley for the main engine. Background Technique
[0002] In the field of shipbuilding, some small boats are small in size and simple in function. They do not have a generator set, but they need to be equipped with a marine water pump to achieve the purpose of pumping and discharging bilge water, providing fire water, and providing flushing water.
[0003] Some existing solutions use DC pumps, but the power of the battery cannot support pumps with large power, so it is impossible to perfectly achieve this purpose. Therefore, it is changed to use a pulley of the marine main engine to drive the water pump. Generally, the marine main engines of small boats range from dozens of kilowatts to hundreds of kilowatts. It is no problem to drive a pump with a shaft power of only a few kilowatts. However, some main engines are not designed with the function of driving a pulley during design. Therefore, we need to attach it ourselves when needed, and it should not exceed the bolt torque, tensile strength, and yield strength selected during the design of the main engine. Content of the Utility Model
[0004] The purpose of the utility model is to propose a new type of additional pulley for the main engine, which can solve at least one of the above technical problems. The technical solution of the utility model is as follows:
[0005] A new type of additional pulley for the main engine includes: a mounting flange and a main engine crankshaft shock absorber. There are several clearance holes on the mounting flange. There are several belt mounting bolt holes on the mounting flange. There are several mounting bolt holes on the main engine crankshaft shock absorber. The mounting flange is arranged on the main engine crankshaft shock absorber, and the main engine crankshaft shock absorber is arranged on the main engine. Mounting bolts are provided on both the belt mounting bolt holes and the mounting bolt holes.
[0006] Further, the number of the belt mounting bolt holes is half of the number of the mounting bolt holes.
[0007] Further, the number of the mounting bolts arranged in the belt mounting bolt holes is half of the number of the mounting bolt holes.
[0008] Preferably, the number of the belt mounting bolt holes is three.
[0009] Preferably, a connecting shaft is fixed in the middle of the mounting flange, and a pulley is fixed at the end of the connecting shaft.
[0010] Preferably, a pulley groove is provided on the pulley.
[0011] In summary, the beneficial effects of the utility model compared with the prior art are as follows:
[0012] The utility model provides a new type of host additional pulley. When assembling and installing, the user places the mounting flange on the host crankshaft shock absorber, aligns a number of belt mounting bolt holes and a number of mounting bolt holes, and then fixes the mounting flange on the host crankshaft shock absorber through mounting bolts. The number of belt mounting bolt holes is half of the number of mounting bolt holes, so that the mounting bolts installed on the belt mounting bolt holes are also half of the number of mounting bolt holes. The remaining mounting bolts fix the host crankshaft shock absorber on the host. Compared with the prior art, the shear force received by the mounting bolts will not exceed the design value. Even if the mounting bolts on the mounting flange are completely broken, the shock absorber will still be intact on the host and will not cause the host crankshaft to break, improving the service life of the host and preventing the host from having unpredictable failures. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic diagram of the main body of the utility model.
[0014] Figure 2 is a schematic diagram of the host crankshaft shock absorber of the utility model.
[0015] Figure 3 is a schematic diagram of the mounting flange of the utility model.
[0016] Description of the reference numerals: 1, mounting flange; 2, host crankshaft shock absorber; 3, clearance position; 4, partition net; 5, belt mounting bolt hole; 6, mounting bolt; 11, connecting shaft; 12, pulley; 121, pulley groove. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] The following further describes the utility model in conjunction with the drawings and specific embodiments:
[0018] As Figures 1 to 3 shown, a new type of host additional pulley is characterized by comprising a mounting flange 1 and a host crankshaft shock absorber 2. A number of clearance positions 3 are provided on the mounting flange 1, a number of belt mounting bolt holes 4 are provided on the mounting flange 1, a number of mounting bolt holes 5 are provided on the host crankshaft shock absorber 2. The mounting flange 1 is arranged on the host crankshaft shock absorber 2, the host crankshaft shock absorber 2 is arranged on the host, and mounting bolts 6 are provided on both the belt mounting bolt holes 4 and the mounting bolt holes 5.
[0019] A new type of main engine additional pulley with the above structure, during assembly and installation, the user places the mounting flange 1 on the main engine crankshaft damper 2, aligns a number of belt mounting bolt holes 4 and a number of mounting bolt holes 5, and then fixes the mounting flange 1 on the main engine crankshaft damper 2 through the mounting bolts 6. The number of belt mounting bolt holes 4 is half of the number of mounting bolt holes 5, so that the mounting bolts 6 installed in the belt mounting bolt holes 4 are also half of the number of mounting bolt holes 5. The remaining mounting bolts 5 fix the main engine crankshaft damper 2 on the main engine. Compared with the prior art, the shear force received by the mounting bolts will not exceed the design value. Even if the mounting bolts on the mounting flange are completely broken, the damper will still be intact and attached to the main engine, and will not cause the main engine crankshaft to break, improving the service life of the main engine and preventing unpredictable failures of the main engine.
[0020] As Figures 1 to 3 shown, in some embodiments of the present invention, the number of the belt mounting bolt holes 4 is half of the number of the mounting bolt holes 5.
[0021] The mounting bolts 6 arranged in the belt mounting bolt holes 4 are half of the number of the mounting bolt holes 5.
[0022] The number of the belt mounting bolt holes 4 is three.
[0023] For a new type of main engine additional pulley with the above structure, when all the mounting bolts 6 and the broken part are broken due to excessive rotational inertia during the operation of the main engine, in this application, the broken part is selected, and by reducing the belt mounting bolt holes 4 on the original full-hole mounting flange 1 and reducing the number of the belt mounting bolt holes 4 by half of its original number, the shear force received by the other half of the mounting bolts 6 on the main engine crankshaft damper 2 will not exceed the design value. Even if the mounting bolts 6 on the mounting flange 1 are completely broken, only the pulley 12 will be detached, and the damper 2 will still be intact and attached to the main engine crankshaft, and will not cause the main engine crankshaft to break, improving the service life of the main engine and preventing unpredictable failures of the main engine.
[0024] As Figure 3 shown, a connecting shaft 11 is fixed in the middle of the mounting flange 1, and a pulley 12 is fixed at the end of the connecting shaft 11.
[0025] A pulley groove 121 is provided on the pulley 12.
[0026] A new type of main engine attached pulley with the above structure. When the moment of inertia is too large, one possibility is that the connecting shaft 11 may be twisted off due to the effect of the moment of inertia, causing the pulley 12 to fall off without affecting the attachment of the shock absorber 2 to the main engine crankshaft. Another possibility is that after the mounting bolts 6 on the mounting flange 1 break due to shear force, only the mounting flange 1 will fall off from the shock absorber 2, thus not affecting the attachment of the shock absorber 2 to the main engine crankshaft. At the same time, the user can reduce the self-weight of the pulley 12 to reduce the impact of the sag caused by the self-weight at the end of the pulley 12 on the entire rotating system during rotation.
[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A new type of main engine additional pulley, characterized in that, Including: An installation flange (1) and a main engine crankshaft shock absorber (2), wherein a plurality of clearance positions (3) are provided on the installation flange (1), a plurality of belt installation bolt holes (4) are provided on the installation flange (1), a plurality of installation bolt holes (5) are provided on the main engine crankshaft shock absorber (2), the installation flange (1) is arranged on the main engine crankshaft shock absorber (2), the main engine crankshaft shock absorber (2) is arranged on the main engine, and installation bolts (6) are provided on both the belt installation bolt holes (4) and the installation bolt holes (5).
2. The novel main engine additional pulley according to claim 1, wherein The number of the belt installation bolt holes (4) is half of that of the installation bolt holes (5).
3. A novel main engine additional pulley according to claim 1, characterized in that The number of the installation bolts (6) arranged in the belt installation bolt holes (4) is half of that of the installation bolt holes (5).
4. A novel main engine additional pulley according to claim 2, characterized in that The number of the belt installation bolt holes (4) is three.
5. A novel main engine additional pulley according to claim 1, characterized in that A connecting shaft (11) is fixed in the middle of the installation flange (1), and a belt pulley (12) is fixed at the end of the connecting shaft (11).
6. The novel main engine additional pulley according to claim 1, wherein A pulley groove (121) is provided on the belt pulley (12).