Dual bearing support large reduction ratio electric propulsion marine gear case

Abstract

The utility model discloses a double bearing support big reduction ratio pure electric power marine gear box, especially relates to marine transmission device technical field, including upper box and input shaft subassembly, the bottom of upper box is provided with lower box, the inside of upper box places input shaft subassembly, the side of input shaft subassembly is engaged and is connected with intermediate shaft subassembly, the below of intermediate shaft subassembly is engaged and is connected with output shaft subassembly, through the assembly of first fixed bearing and second fixed bearing of input gear shaft both ends respectively, and both bearing outer rings all with upper box inner wall corresponding mounting hole fixed, form double bearing support structure, through double bearing structure can directly limit the radial runout and offset of input gear shaft rotation, ensure that the tooth on the axle always keeps and the meshing position of intermediate shaft gear, avoid the abnormality of meshing clearance due to axle body sway, reduce the tooth surface friction wear, reduce power transmission loss in the use, make transmission process tend to be stable.

Description

Technical Field

[0001] This utility model relates to the technical field of marine transmission devices, and more specifically, to a dual-bearing supported high reduction ratio pure electric marine gearbox. Background Technology

[0002] A pure electric marine gearbox is a mechanical transmission device specifically designed for pure electric ships. It converts the high-speed, low-torque output of an electric motor into the low-speed, high-torque power required by the propeller, while simultaneously bearing the thrust and torque generated by the propeller. Existing publication number CN212959711U discloses a high-power, ultra-high reduction ratio marine gearbox, belonging to the field of marine gearbox technology. It includes a base, a lower housing bolted to the upper end of the base, a cover on the lower housing, an upper housing between the cover and the lower housing, an input shaft component and an intermediate shaft component between the cover and the upper housing, with the intermediate shaft component meshing with the input shaft component. A transmission shaft component meshing with the intermediate shaft component is located between the upper and lower housings. An output shaft component meshing with the transmission shaft component is located between the lower housing and the base. A reversing valve connected to the input shaft component and the transmission shaft component via an oil circuit is located at the upper end of the cover. It features a compact structure, convenient assembly and disassembly, high structural strength, and good operational reliability. It solves the problem of how to implement clutch, deceleration, and reverse / forward driving functions. In the process of developing the above-mentioned utility model, the inventors discovered the following problems with the existing technology. In this design, a single bearing support structure is used during the rotation of the shaft. However, under high torque and high speed conditions, the single bearing support structure is prone to shaft misalignment, leading to abnormal gear meshing clearance, reduced transmission efficiency, accelerated tooth surface wear, and ultimately equipment damage.

[0003] Therefore, a dual-bearing-supported gearbox for pure electric ships with a large reduction ratio is proposed to address the above problems. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a dual-bearing supported high reduction ratio pure electric marine gearbox to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-bearing-supported high-reduction-ratio pure electric marine gearbox, comprising an upper housing and an input shaft assembly, a lower housing is provided at the bottom of the upper housing, the input shaft assembly is placed inside the upper housing, an intermediate shaft assembly is meshed with the side of the input shaft assembly, and an output shaft assembly is meshed with the bottom of the intermediate shaft assembly.

[0006] Preferably, the input shaft assembly includes a high-elasticity coupling, an input coupling, a retaining ring, and a shaft retaining ring. The input coupling is installed inside the high-elasticity coupling, and the retaining ring is installed inside the input coupling. A hollow shaft is provided at the center of the retaining ring, and the retaining ring is inserted into the hollow shaft.

[0007] Preferably, the input shaft assembly further includes a first fixed bearing, an input gear shaft, and a second fixed bearing. The two ends of the input gear shaft are respectively connected to the first fixed bearing and the second fixed bearing, and the input shaft assembly and the retaining ring are plugged into each other.

[0008] Preferably, the intermediate shaft assembly includes an intermediate gear shaft that is inserted into the center of the intermediate shaft gear, and a positioning bearing is provided at the end of the intermediate gear shaft away from the intermediate shaft gear, and an oil injection pan is provided on the side of the positioning bearing.

[0009] Preferably, the output shaft assembly includes an output shaft gear, the output shaft gear is internally connected to a first mounting plate, and the first mounting plate is internally connected to an output coupling.

[0010] Preferably, the output shaft gear is connected through the center of the output shaft body, a second mounting plate is installed at the end of the output shaft body away from the output shaft gear, and a sealing plate is provided at the end of the output shaft body located on the second mounting plate.

[0011] Preferably, mounting holes are provided at the edges of both the upper and lower housings, and the upper and lower housings are connected by mounting holes and bolts to form a detachable structure.

[0012] Preferably, a cooler is installed at the top of the upper housing, and the cooler is connected to an electric pump via a pipe.

[0013] The technical effects and advantages of this utility model are as follows: Compared with existing technologies, this dual-bearing support for a high-reduction-ratio pure electric marine gearbox features a first fixed bearing and a second fixed bearing mounted at both ends of the input gear shaft. The outer rings of both bearings are fixed to corresponding mounting holes on the inner wall of the upper gearbox, forming a dual-bearing support structure. This dual-bearing structure directly limits the radial runout and offset of the input gear shaft during rotation, ensuring that the teeth on the shaft always maintain the meshing position with the intermediate shaft gear. This prevents abnormal meshing clearance caused by shaft shaking, reduces tooth surface friction and wear, and lowers power transmission losses during use, resulting in smoother transmission. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the internal structure of the upper and lower boxes of this utility model.

[0016] Figure 3 This is a first-view structural schematic diagram of the present invention.

[0017] Figure 4 This is a structural schematic diagram of the present invention from a second perspective.

[0018] Figure 5 This is a side view of the output shaft gear of this utility model.

[0019] Figure 6 This is a side view of the intermediate shaft gear of this utility model.

[0020] Figure 7 This is a schematic diagram of the unfolded structure of the input shaft assembly of this utility model.

[0021] The attached figures are labeled as follows: 1. Upper housing; 2. Lower housing; 3. Mounting hole; 4. Cooler; 5. Electric pump; 6. Input shaft assembly; 7. Intermediate shaft assembly; 8. Output shaft assembly; 9. Intermediate shaft gear; 10. Intermediate gear shaft; 11. Positioning bearing; 12. Oil filling pan; 13. Output shaft gear; 14. First mounting plate; 15. Output coupling; 16. Output shaft body; 17. Second mounting plate; 18. Sealing plate; 19. High-elasticity coupling; 20. Input coupling; 21. Retaining ring; 22. Shaft retaining ring; 23. First fixed bearing; 24. Input gear shaft; 25. Second fixed bearing. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0023] As attached Figures 1 to 7 The dual-bearing-supported high reduction ratio pure electric marine gearbox shown includes an upper housing 1 and an input shaft assembly 6. A lower housing 2 is provided at the bottom of the upper housing 1. The input shaft assembly 6 is placed inside the upper housing 1. An intermediate shaft assembly 7 is meshed with the side of the input shaft assembly 6. An output shaft assembly 8 is meshed with the bottom of the intermediate shaft assembly 7.

[0024] During the operation of the gearbox, power is input into the input shaft assembly 6. The input coupling 20, engaged by the high-elasticity coupling 19, rotates, causing the fixed ring 21 to rotate. The input gear shaft 24, connected to the fixed ring 21, rotates. The input gear shaft 24 has teeth that mesh with the teeth on the intermediate gear shaft 10 of the intermediate shaft assembly 7. Therefore, when the input gear shaft 24 rotates, it in turn drives the intermediate gear shaft 10 of the intermediate shaft assembly 7 to rotate. During this rotation, the first fixed bearing 23 and the second fixed bearing 25 installed at both ends of the input gear shaft 24 fix it in position on the upper housing 1, reducing its offset. Then, when the intermediate gear shaft 10 rotates, it drives the output shaft body 16 of the meshed output shaft assembly 8 to rotate, thereby transmitting the power obtained by the output shaft assembly 8 to the output shaft assembly 8 through the intermediate shaft assembly 7.

[0025] In a preferred embodiment, the input shaft assembly 6 includes a high-elasticity coupling 19, an input coupling 20, a retaining ring 21, and a shaft retaining ring 22. The high-elasticity coupling 19 is a component that connects the input shaft assembly 6 to an external power source. The high-elasticity coupling 19 has a reserved installation space inside for fixing the input coupling 20. The input coupling 20 is installed inside the high-elasticity coupling 19. A hollow shaft is provided at the center of the retaining ring 21. The hollow shaft allows torque transmission to the input gear shaft 24 through insertion with the input gear shaft 24. The retaining ring 21 is installed inside the input coupling 20. A hollow shaft is provided at the center of the retaining ring 21. The retaining ring 22 is inserted into the hollow shaft of the retaining ring 21. The shaft retaining ring 22 is sleeved on the end of the hollow shaft of the retaining ring 21. Through axial limiting, it prevents the retaining ring 21 and the input gear shaft 24 from axially shifting during rotation, ensuring the stability of their connection.

[0026] In a preferred embodiment, the input shaft assembly 6 further includes a first fixed bearing 23, an input gear shaft 24, and a second fixed bearing 25. The first fixed bearing 23 and the second fixed bearing 25 are respectively connected to both ends of the input gear shaft 24. The input shaft assembly 6 and the retaining ring 21 are plugged into each other. After assembly, the outer rings of the first fixed bearing 23 and the second fixed bearing 25 are respectively fixed to the corresponding mounting holes 3 on the inner wall of the upper housing 1, so that the input gear shaft 24 is stably positioned inside the upper housing 1 through the double bearing support structure. The double bearing support design can effectively limit the radial runout and offset of the input gear shaft 24 during rotation, ensure that the teeth on the input gear shaft 24 always remain in a meshing state, avoid abnormal gear meshing clearance due to shaft offset, reduce tooth surface wear, and ensure smooth power transmission.

[0027] In a preferred embodiment, the intermediate shaft assembly 7 includes an intermediate shaft gear 9 with an intermediate gear shaft 10 inserted into its center. The intermediate shaft gear 9 and the intermediate gear shaft 10 are connected by an insertion method, and the two are connected by an interference fit or a key to ensure that torque transmission is slip-free, allowing the intermediate shaft gear 9 to rotate synchronously with the intermediate gear shaft 10. A positioning bearing 11 is provided at the end of the intermediate gear shaft 10 away from the intermediate shaft gear 9. When the input gear shaft 24 rotates, the force between the tooth surfaces drives the intermediate shaft gear 9 to rotate, thereby driving the intermediate gear shaft 10 to rotate synchronously, realizing the transmission of power from the input shaft assembly 6 to the intermediate shaft assembly 7. Because the gearbox is designed with a large reduction ratio, there is a difference in the number of teeth between the input gear shaft 24 and the intermediate shaft gear 9. By meshing gears with different numbers of teeth, a preliminary reduction effect can be achieved, converting the input high-speed power into relatively low-speed power and transmitting it to the intermediate gear shaft 10. An oil filling pan 12 is provided on the side of the positioning bearing 11. The oil filling pan 12 is connected to the gearbox's lubrication system through a pipeline, which can guide lubricating oil to the contact parts between the rolling elements and the inner and outer rings of the positioning bearing 11, as well as the meshing point between the intermediate shaft gear 9 and the input gear shaft 24. Through lubrication, friction and wear between components are reduced, and heat generated by local friction is carried away, extending the service life of the components.

[0028] In a preferred embodiment, the output shaft assembly 8 includes an output shaft gear 13, the output shaft gear 13 is internally connected to a first mounting plate 14, and the first mounting plate 14 is internally connected to an output coupling 15.

[0029] In a preferred embodiment, an output shaft body 16 is connected through the center of the output shaft gear 13, a second mounting plate 17 is installed at the end of the output shaft body 16 away from the output shaft gear 13, and a sealing plate 18 is provided at the end of the output shaft body 16 located on the second mounting plate 17.

[0030] In a preferred embodiment, mounting holes 3 are provided at the edges of both the upper housing 1 and the lower housing 2. The external support structure of the gearbox is jointly formed by the upper housing 1 and the lower housing 2, which are connected through the mounting holes 3 provided at their respective edges. During assembly, bolts are passed through the mounting holes 3 of the upper and lower housings 2 to complete the fastening. The upper housing 1 and the lower housing 2 form a detachable structure through the mounting holes 3 and bolts. The upper housing 1 and the lower housing 2 form a detachable closed structure. The detachable structure facilitates the pre-assembly and debugging of components before the gearbox leaves the factory, and allows for quick disassembly of the housing during later maintenance to inspect or replace the internal shaft system, gears and other core components.

[0031] In a preferred embodiment, a cooler 4 is installed at the top of the upper housing 1. The cooler 4 is connected to an electric pump 5 through a pipe. The cooler 4 is connected to the electric pump 5 through a dedicated pipe. During the operation of the gearbox, the electric pump 5 can actively draw the lubricating oil inside the gearbox and transport it to the cooler 4 through the pipe. After being cooled by the cooler 4, the cooled fluid returns to the gearbox through the return pipe, forming a circulating cooling circuit. This removes the heat generated by gear meshing and bearing rotation, preventing the oil temperature inside the gearbox from becoming too high, which could lead to lubrication failure or thermal deformation of components, and maintaining the long-term stable operation of the gearbox.

[0032] In this embodiment, the high-elasticity coupling 19, cooler 4, electric pump 5, first fixed bearing 23 and second fixed bearing 25 are all commercially available devices known to those skilled in the art. They can be customized or selected according to actual needs. Here we are only using them without making any structural or functional improvements, and we will not go into detail here.

[0033] The working process of this utility model is as follows: First, during the use of the gearbox, power is input into the input shaft assembly 6. Then, the input coupling 20, which is engaged by the high-elasticity coupling 19, drives the fixed ring 21 to rotate. The input gear shaft 24, which is engaged with the fixed ring 21, rotates. The input gear shaft 24 is provided with teeth, and the teeth on the input gear shaft 24 mesh with the teeth on the intermediate gear shaft 10 of the intermediate shaft assembly 7. Therefore, when the input gear shaft 24 is driven to rotate, it in turn drives the intermediate gear shaft on the intermediate shaft assembly 7. When the intermediate gear shaft 10 rotates, the first fixed bearing 23 and the second fixed bearing 25 installed at both ends of the input gear shaft 24 fix the output gear shaft in the position of the upper housing 1, thereby reducing the offset of the input gear shaft 24. Then, when the intermediate gear shaft 10 rotates, it drives the output shaft body 16 of the meshed output shaft assembly 8 to rotate, thereby transmitting the power obtained by the output shaft assembly 8 to the output shaft assembly 8 through the intermediate shaft assembly 7. The above is the working principle of the dual-bearing supported high reduction ratio pure electric marine gearbox.

Claims

1. A dual-bearing-supported, high-reduction-ratio pure electric marine gearbox, comprising an upper housing (1) and an input shaft assembly (6), characterized in that: The bottom of the upper housing (1) is provided with a lower housing (2). An input shaft assembly (6) is placed inside the upper housing (1). An intermediate shaft assembly (7) is engaged with the side of the input shaft assembly (6). An output shaft assembly (8) is engaged with the bottom of the intermediate shaft assembly (7).

2. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 1, characterized in that: The input shaft assembly (6) includes a high-elasticity coupling (19), an input coupling (20), a retaining ring (21), and a shaft retaining ring (22). The high-elasticity coupling (19) has an input coupling (20) installed inside, and the input coupling (20) has a retaining ring (21) installed inside. A hollow shaft is provided at the center of the retaining ring (21), and the retaining ring (22) is inserted into the hollow shaft.

3. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 2, characterized in that: The input shaft assembly (6) also includes a first fixed bearing (23), an input gear shaft (24), and a second fixed bearing (25). The two ends of the input gear shaft (24) are respectively connected to the first fixed bearing (23) and the second fixed bearing (25). The input shaft assembly (6) and the fixed ring (21) are connected by insertion.

4. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 1, characterized in that: The intermediate shaft assembly (7) includes an intermediate gear shaft (10) inserted into the center of the intermediate shaft gear (9). A positioning bearing (11) is provided at the end of the intermediate gear shaft (10) away from the intermediate shaft gear (9), and an oil filling plate (12) is provided on the side of the positioning bearing (11).

5. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 1, characterized in that: The output shaft assembly (8) includes an output shaft gear (13), and a first mounting plate (14) is internally connected to the output shaft gear (13), and an output coupling (15) is internally connected to the first mounting plate (14).

6. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 5, characterized in that: The output shaft gear (13) is connected through the center of the output shaft body (16). A second mounting plate (17) is installed at the end of the output shaft body (16) away from the output shaft gear (13). A sealing plate (18) is provided at the end of the output shaft body (16) located on the second mounting plate (17).

7. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 1, characterized in that: Mounting holes (3) are provided at the edges of the upper box (1) and the lower box (2), and the upper box (1) and the lower box (2) are connected by mounting holes (3) and bolts to form a detachable structure.

8. The dual-bearing supported high reduction ratio pure electric marine gearbox according to claim 7, characterized in that: A cooler (4) is installed at the top of the upper housing (1), and the cooler (4) is connected to an electric pump (5) through a pipe.

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