Lifting gear box with compound planetary structure

Abstract

The utility model discloses a lifting gear box with a compound planetary structure, which relates to the technical field of gear boxes and comprises a box body. The input shaft is arranged at the first end of the box body; the first-stage planetary assembly is of an NW planetary structure and is in transmission connection with the input shaft; the second-stage planetary assembly is of an NGW planetary structure and is in transmission connection with the first-stage planetary assembly; the third-stage planetary assembly is of an NW planetary structure and is in transmission connection with the second-stage planetary assembly, the climbing gear shaft is in transmission connection with the third-stage planetary assembly, and the climbing gear shaft is in transmission connection with the third-stage planetary assembly. According to the lifting gear box of the compound planetary structure, the technical problems that an existing lifting gear box is not high in stability during operation, unbalance loading is possibly generated when the lifting gear box suffers from ocean atrocious weather, and consequently gear failure is caused are solved, the first-stage planetary assembly, the second-stage planetary assembly and the third-stage planetary assembly are in transmission connection, and only the second sun gear and the second planet carrier are of a floating structure; and the operation stability of the gearbox can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting gear boxes, in particular to a lifting gear box with a composite planetary structure. Background Art

[0002] The lifting system of an offshore platform directly affects the operating efficiency and safety of the platform. The lifting gearbox is an important part of the lifting system and is required to have the characteristics of large load-bearing capacity, high reliability and stable operation.

[0003] At present, most of the lifting gearboxes for self-elevating offshore platforms adopt a hybrid transmission structure of parallel stage plus planetary stage, as well as a multi-stage planetary structure. However, its multi-stage planetary structure basically adopts a four-stage NGW structure, and the planetary carriers and sun gears from the first stage to the fourth stage are all floating structures. Its stability during operation is not high, and when subjected to severe marine climate, it may cause partial load and gear failure. Therefore, a composite planetary structure lifting gearbox is proposed to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a composite planetary structure lifting gear box, which solves the technical problems that the existing lifting gear box has low stability during operation and may produce unbalanced loads and cause gear failure when subjected to severe marine climate.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a composite planetary structure lifting gear box. Box body;

[0006] An input shaft, disposed at the first end of the housing, for inputting power;

[0007] A first-stage planetary assembly, which is a NW planetary structure, is disposed at the first end of the housing and is drivingly connected to the input shaft;

[0008] The secondary planetary assembly is a NGW planetary structure, which is disposed in the middle of the housing and is drivingly connected to the primary planetary assembly;

[0009] The third-stage planetary assembly is a NW planetary structure, which is disposed at the second end of the housing and is transmission-connected to the second-stage planetary assembly;

[0010] The climbing gear shaft is used for outputting power, and the climbing gear shaft is drivingly connected to the three-stage planetary assembly.

[0011] Preferably, the first-stage planetary assembly includes: an input shaft connected to the first sun gear, a first inner ring gear provided on the inner wall of the housing, the first sun gear meshingly connected to the first planetary gear, the first planetary gear meshingly connected to the first inner ring gear, and the first planetary gear connected to the first planet carrier via the first planet shaft.

[0012] Preferably, an outer peripheral side surface of the first inner gear ring is provided with an external spline, and an inner peripheral side surface of the housing is provided with an internal spline, and the external spline is connected to the internal spline.

[0013] Preferably, the secondary planetary assembly includes: a second sun gear connected to the first planet carrier; a second inner ring gear provided on the inner wall of the housing, the second sun gear meshingly connected to the second planet gear, the second planet gear meshingly connected to the second inner ring gear, and the second planet gear connected to the second planet carrier via a second planet shaft.

[0014] Preferably, a through hole is provided on the side of the secondary planet carrier, and the through hole is used to pass the second planet shaft, and the second planet shaft is connected to the second planet gear through a second rolling bearing.

[0015] Preferably, the three-stage planetary assembly includes: a third sun gear connected to the second planet carrier; a third inner ring gear provided on the inner wall of the casing, the third sun gear meshingly connected to the third planetary gear and the third planetary gear shaft, the third planetary gear shaft meshingly connected to the third inner ring gear, the third inner ring gear connected to the ring gear holder, and the ring gear holder connected to the climbing gear shaft.

[0016] Preferably, the third planetary gear shaft is connected to the middle part of the housing through a third rolling bearing, the third planetary gear is interference-connected to the third planetary gear shaft, and the third planetary gear is meshingly connected to the third sun gear.

[0017] Preferably, the third inner gear ring is meshingly connected to the third planetary gear shaft, and the third inner gear ring is connected to a gear ring holder via bolts, and the gear ring holder is rotatably connected to the housing.

[0018] Preferably, the climbing gear shaft is connected to one end of the ring gear holder via a spline, and the middle portion of the climbing gear shaft is connected to the second end of the housing via a sixth rolling bearing.

[0019] Preferably, a groove and a positioning step are provided on the outer peripheral side surface of the climbing gear shaft, a retaining ring is provided in the groove, the retaining ring abuts against the left end surface of the inner ring of the sixth rolling bearing, and the positioning step abuts against the right end surface of the inner ring of the sixth rolling bearing.

[0020] Compared with the above background technology, the utility model provides a composite planetary structure lifting gearbox, in which the first-stage planetary assembly, the second-stage planetary assembly and the third-stage planetary assembly are connected by transmission, the first-stage planetary assembly and the third-stage planetary assembly are both NW composite planetary structures, and only the second-stage planetary assembly is an NGW structure, that is, only the second sun gear and the second planet carrier are floating structures, which can effectively improve the stability of the gearbox during operation and effectively reduce the occurrence of gear failure caused by eccentric load. Moreover, through the transmission connection of the first-stage planetary assembly, the second-stage planetary assembly and the third-stage planetary assembly, while achieving the large transmission ratio of the traditional four-stage NGW planetary structure, it is shorter in length and lighter in weight than the traditional multi-stage NGW planetary structure, and can provide a greater torque density. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 This is a cross-sectional schematic diagram of a gear box provided in an embodiment of the utility model.

[0023] Specifically, 1-housing; 2-rotating bearing; 3-first rolling bearing; 4-first end cover; 5-input shaft; 6-first sun gear; 7-first planetary gear; 8-first planet carrier; 9-first planetary shaft; 10-needle bearing; 11-first inner gear ring; 12-second sun gear; 13-second planetary gear; 14-second planet carrier; 15-second rolling bearing; 16-second planetary shaft; 17-third sun gear; 18-second inner gear ring; 19-third planetary gear shaft; 20-third planetary gear; 21-bearing sleeve; 22-third rolling bearing; 23-fourth end cover; 24-third inner gear ring; 25-assembly frame; 26-fourth rolling bearing; 27-eighth rolling bearing; 28-gear ring retainer; 29-fifth rolling bearing; 30-pressure cover; 31-sixth rolling bearing; 32-second end cover; 33-climbing gear shaft; 34-third end cover; 35-bearing seat; 36-seventh rolling bearing. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] To enable those skilled in the art of this technical field to better understand the solution of this utility model, the following further detailed description of the utility model will be given in conjunction with the accompanying drawings and specific embodiments.

[0026] As Figure 1 shown, a compound planetary structure lifting gearbox includes: a box body 1 and an input shaft 5, a first-stage planetary assembly, a second-stage planetary assembly, and a third-stage planetary assembly disposed within the box body 1.

[0027] Specifically, the input shaft 5 is disposed at the front of the box body 1 for inputting power. Among them, a first rolling bearing 3 is provided between the input shaft 5 and the box body 1 to improve the stability of the input shaft 5 during operation. In addition, a first end cover 4 is provided outside the first rolling bearing 3, and the end cover can seal the lubricating oil at the position of the first rolling bearing 3.

[0028] The first-stage planetary assembly is integrally arranged in an NW planetary structure and is disposed at the front of the box body 1 and is drivingly connected to the input shaft 5; the second-stage planetary assembly is integrally arranged in an NGW planetary structure and is disposed in the middle of the box body 1 and is drivingly connected to the first-stage planetary assembly; the third-stage planetary assembly is integrally arranged in an NW planetary structure and is disposed at the rear of the box body 1 and is drivingly connected to the second-stage planetary assembly; the climbing gear shaft 33 is used for outputting power, and the climbing gear shaft 33 is drivingly connected to the third-stage planetary assembly.

[0029] It should be noted that NGW in the NGW planetary structure is composed of the initials of the Chinese pinyin of the three characters 'inner, public, and outer'. In order to evenly distribute the loads of the three planet gears, a tooth type floating mechanism is adopted, that is, the sun gear or the planet carrier floats, or both the sun gear and the planet carrier float simultaneously. NW in the NW planetary structure is composed of the initials of the Chinese pinyin of the two characters 'inner and outer'. Compared with the NGW type planetary drive, the NW type drive has the advantages of compact structure, large transmission ratio, and high load-bearing capacity. The NGW planetary structure and the NW planetary structure are both introduced in the prior art and will not be elaborated in detail. Specifically, reference can be made to a utility model patent with the application number: '2012205484835', and an invention patent with the application number '2019102514375'.

[0030] When working, the motor inputs power through the input shaft 5, the input shaft 5 drives the first-stage planetary assembly to operate, the first-stage planetary assembly transmits power to the second-stage planetary assembly, the second-stage planetary assembly transmits power to the third-stage planetary assembly, the third-stage planetary assembly transmits power to the climbing gear shaft 33, and the climbing gear shaft 33 outputs power. The first-stage planetary assembly and the third-stage planetary assembly adopt the NW composite planetary structure, and the second-stage planetary assembly adopts the NGW structure, with only one floating structure, which effectively improves the stability of the gearbox during operation and reduces the occurrence of gear failure caused by eccentric load.

[0031] In one embodiment of the utility model, the first-stage planetary assembly includes: an input shaft 5, the input shaft 5 is connected to the first sun gear 6, the first sun gear 6 is meshedly connected to the first planetary gear 7, the inner wall of the housing 1 is provided with a first inner gear ring 11, the first planetary gear 7 is meshedly connected to the first inner gear ring 11, the first planetary gear 7 is connected to the first planetary carrier 8 through the first planetary shaft 9, the input shaft 5 drives the first sun gear 6 to rotate, and since the first planetary gear 7 is meshedly connected to the first inner gear ring 11, while the first sun gear 6 drives the first planetary gear 7 to rotate, the first planetary carrier 8 performs circular motion with the first sun gear 6 as the axis.

[0032] Among them, a first through hole is provided on the side of the first planet carrier 8, and a first planet shaft 9 is passed through the first through hole. The first planet shaft 9 is assembled on the first planet gear 7 through a needle bearing 10. When the first planet carrier 8 performs a circular motion with the first sun gear 6 as the axis, the first planet shaft 9 rotates relative to the first star gear. In addition, a first adjustment pad is provided between the first planet gear 7 and the first planet carrier 8, and a second adjustment pad is used to adjust the axial relative position of the first planet gear 7 on the first planet carrier 8, thereby adjusting the meshing position between the first planet gear 7 and the first sun gear 6, and improving the overall stability of the primary planet assembly during operation.

[0033] It should be noted that a rotary bearing 2 is installed between the first sun gear 6 and the first planet carrier 8 to ensure that the first sun gear 6 can rotate relative to the first planet carrier 8 and the second sun gear 12 .

[0034] Specifically, the outer peripheral side of the first inner gear ring 11 is provided with an external spline, and the inner peripheral side of the casing 1 is provided with an internal spline. The external spline is connected to the internal spline. The external spline and the internal spline cooperate with each other to connect the first inner gear ring 11 and the casing 1, which can achieve a better load balancing effect and improve the stability of the first-stage planetary assembly during operation.

[0035] The secondary planetary assembly includes: a second sun gear 12, which is connected to the first planet carrier 8 through a first spline, and the second sun gear 12 is meshed with the second planet gear 13; a second inner gear ring 18 is arranged on the inner wall of the housing 1, and the second planet gear 13 is meshed with the second inner gear ring 18, and the second planet gear 13 is connected to the second planet carrier 14 through a second planet shaft 16, and the first planet carrier 8 makes a circular motion with the first sun gear 6 as the axis while driving the second sun gear 12 to rotate. Since the second planet gear 13 is meshed with the second inner gear ring 18, while the second sun gear 12 drives the second planet gear 13 to rotate, the second planet carrier 14 makes a circular motion with the second sun gear 12 as the axis.

[0036] It should be noted that the second inner gear ring 18 is connected to the housing 1 by bolts. Specifically, the second inner gear ring 18 is fixedly connected between the front and rear of the housing 1 while the bolts connect the front and rear of the housing 1 .

[0037] Among them, the second planetary gear 13 meshes with the second sun gear 12 and the second inner gear ring 18 at the same time. A second through hole is provided on the side of the secondary planetary carrier. The second through hole is used to penetrate the second planetary shaft 16. The second planetary shaft 16 is assembled on the second planetary gear 13 through the second rolling bearing 15. When the second planetary carrier 14 performs a circular motion with the second sun gear 12 as the axis, the second planetary shaft 16 rotates relative to the second planetary gear. In addition, a second adjustment pad is provided between the second planetary gear 13 and the second planetary carrier 14. The second adjustment pad is used to adjust the axial relative position of the second planetary gear 13 on the second planetary carrier 14, thereby adjusting the meshing position between the second planetary gear 13 and the second sun gear 12, and improving the overall stability of the secondary planetary assembly during operation.

[0038] The three-stage planetary assembly is arranged at the rear of the casing 1, and includes: a third sun gear 17, the third sun gear 17 is connected to the right end face of the second planet carrier 14 through a second spline, a third inner gear ring 24 is arranged on the inner wall of the casing 1, the third inner gear ring 24 does not contact the casing 1, the third sun gear 17 is meshed and connected to the third planetary gear 20, the second planet carrier 14 makes a circular motion with the second sun gear 12 as the axis and drives the third sun gear 17 to rotate, and the third sun gear 17 drives the third planetary gear 20 to rotate.

[0039] Specifically, the third planetary gear shaft 19 is connected to the middle part of the housing 1 through the third rolling bearing 22, wherein the bearing sleeve 21 is sleeved on the outer peripheral side of the third rolling bearing 22, and the third rolling bearing 22 is sleeved on the outer peripheral side of the bearing sleeve 21, the third planetary gear 20 is interference connected with the third planetary gear shaft 19, and the third planetary gear 20 is meshed and connected to the third sun gear 17, the third planetary gear shaft 19 is meshed and connected to the third inner ring gear 24, and the third inner ring gear 24 is connected to the ring gear holder 28 by bolts, and the ring gear holder 28 is rotatably connected to the housing 1, when the third sun gear 17 drives the third planetary gear 20 to rotate, the third planetary gear shaft 19 drives the third inner ring gear 24 to rotate, and then drives the ring gear holder 28 to rotate, the ring gear holder 28 is coaxially connected to the climbing gear shaft 33, the ring gear holder 28 drives the climbing gear shaft 33 to rotate, and the climbing gear shaft 33 outputs power.

[0040] In one embodiment of the utility model, an assembly frame 25 is provided in the middle of the housing 1. The assembly frame 25 and the housing 1 are integrally formed and are part of the structure of the housing 1. The assembly frame 25 is connected to the right end of the third planetary gear shaft 19 through the eighth rolling bearing 27, and the other end of the assembly frame 25 is connected to one end of the ring gear holder 28 through the fourth rolling bearing 26. The assembly frame 25 plays a role in limiting the third planetary gear shaft 19 and the ring gear holder 28. The third inner gear ring 24 is connected to the ring gear holder 28 through bolts to transmit torque, and at the same time, the rear of the housing 1 is connected to the other end of the ring gear holder 28 through the fifth rolling bearing 29. The ring gear holder 28 can be stably limited by the fourth rolling bearing 26 and the fifth rolling bearing 29 to ensure the stability of the ring gear holder 28 during rotation, thereby improving the overall stability of the gear box.

[0041] At the same time, the climbing gear shaft 33 is connected to the right end face of the ring gear retainer 28 through the third spline, and the middle part of the climbing gear shaft 33 is connected to the rear part of the box body 1 through the sixth rolling bearing 31. The sixth rolling shaft assists in improving the stability of the climbing gear shaft 33 during operation, effectively improving the rigidity and stability of the output system.

[0042] Furthermore, a groove is provided on the outer peripheral side of the climbing gear shaft 33, and a retaining ring is provided in the groove, and the retaining ring abuts against the left end face of the inner ring of the sixth rolling bearing 31. At the same time, a positioning step is provided on the right end face of the climbing gear shaft 33, and the positioning step is used to abut against the right end face of the inner ring of the rolling bearing. The positions of the two ends of the sixth rolling bearing 31 are limited by the retaining ring and the positioning step, so as to avoid the sixth rolling bearing 31 from moving in the axial direction of the climbing gear shaft 33, and improve the stability of the sixth rolling bearing 31.

[0043] Specifically, a second end cover 32 is provided at the rear of the housing 1, and the second end cover 32 is fixed to the housing 1 by bolts to prevent the leakage of lubricating oil at the position of the sixth rolling bearing 31, thereby realizing the sealing function of the housing 1. In addition, a seventh rolling bearing 36 is sleeved on the right end of the climbing gear shaft 33, and the seventh rolling bearing 36 is connected to the bearing seat 35. The climbing gear shaft 33 is further limited by the seventh rolling bearing 36 to prevent the climbing gear shaft 33 from swinging, thereby improving the stability of the climbing gear shaft 33 when rotating. A third end cover 34 is provided on the bearing seat 35, and the third end cover 34 is fixed to the bearing seat 35 by bolts. At the same time, a fourth end cover 23 is provided at the left end of the seventh rolling bearing 36. The arrangement of the third end cover 34 and the fourth end cover 23 effectively prevents the leakage of lubricating oil at the position of the seventh rolling bearing 36.

[0044] In one embodiment of the utility model, a pressure cover 30 is provided on the right end face of the climbing gear shaft 33. The pressure cover 30 is fixedly connected to the pressure cover 30 by bolts. The pressure cover 30 abuts against the right end face of the inner ring of the seventh rolling bearing 36. The seventh rolling bearing 36 is positioned by the pressure cover 30 to prevent the seventh rolling bearing 36 from moving in the axial direction of the climbing gear shaft 33, thereby improving the stability of the seventh rolling bearing 36.

[0045] When the utility model is used, the motor drives the first sun gear 6 to rotate through the input shaft 5. Since the first planetary gear 7 is meshed and connected to the first inner ring gear 11, while the first sun gear 6 drives the first planetary gear 7 to rotate, the first planet carrier 8 makes a circular motion with the first sun gear 6 as the axis, and the first planet carrier 8 drives the second sun gear 12 to rotate at the same time. The second planet carrier 14 makes a circular motion with the second sun gear 12 as the axis. The second planet carrier 14 makes a circular motion with the second sun gear 12 as the axis and drives the third sun gear 17 to rotate. The third sun gear 17 drives the third planetary gear 20 to rotate. The third sun gear 17 drives the third inner ring gear 24 to rotate through the third planetary gear shaft 19. The third inner ring gear 24 drives the gear ring holder 28 to rotate. The gear ring holder 28 drives the climbing gear shaft 33 to rotate, and the climbing gear shaft 33 outputs power.

[0046] In summary, the first-stage planetary assembly and the third-stage planetary assembly are both NW composite planetary structures, and the second-stage planetary assembly is an NGW structure, that is, the second sun gear 12 and the second planet carrier 14 are floating structures, which can effectively improve the stability of the gearbox during operation and effectively reduce the occurrence of gear failure caused by eccentric load. In addition, the first-stage planetary assembly, the second-stage planetary assembly and the third-stage planetary assembly are connected to the climbing gear shaft 33 to output power, while achieving the large transmission ratio of the traditional four-stage NGW planetary structure, it is shorter in length and lighter in weight than the traditional multi-stage NGW planetary structure, and can provide a greater torque density.

[0047] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0048] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A composite planetary structure lifting gearbox, characterized in that: include: Box; An input shaft, disposed at the first end of the housing, for inputting power; A first-stage planetary assembly, which is a NW planetary structure, is disposed at the first end of the housing and is drivingly connected to the input shaft; The secondary planetary assembly is a NGW planetary structure, which is disposed in the middle of the housing and is drivingly connected to the primary planetary assembly; The third-stage planetary assembly is a NW planetary structure, which is disposed at the second end of the housing and is transmission-connected to the second-stage planetary assembly; The climbing gear shaft is used for outputting power, and the climbing gear shaft is drivingly connected to the three-stage planetary assembly.

2. The composite planetary structure lifting gearbox according to claim 1, characterized in that: The first-stage planetary assembly includes: an input shaft connected to a first sun gear, a first inner gear ring arranged on the inner wall of a housing, the first sun gear meshingly connected to a first planetary gear, the first planetary gear meshingly connected to the first inner gear ring, and the first planetary gear connected to a first planet carrier via a first planetary shaft.

3. The composite planetary structure lifting gearbox according to claim 2, characterized in that: An outer peripheral side surface of the first inner gear ring is provided with an external spline, and an inner peripheral side surface of the housing is provided with an internal spline, and the external spline is connected to the internal spline.

4. The composite planetary structure lifting gearbox according to claim 2, characterized in that: The secondary planetary assembly includes: a second sun gear connected to the first planet carrier; a second inner gear ring arranged on the inner wall of the box body, the second sun gear is meshed and connected to the second planet gear, the second planet gear is meshed and connected to the second inner gear ring, and the second planet gear is connected to the second planet carrier through the second planet shaft.

5. The composite planetary structure lifting gearbox according to claim 4, characterized in that: A through hole is provided on the side surface of the second planet carrier, and the through hole is used to pass the second planet shaft, and the second planet shaft is connected to the second planet gear through a second rolling bearing.

6. The composite planetary structure lifting gearbox according to claim 4, characterized in that: The three-stage planetary assembly includes: a third sun gear connected to the second planet carrier; a third inner ring gear arranged on the inner wall of the box body, the third sun gear meshingly connected to the third planet gear and the third planetary gear shaft, the third planetary gear shaft meshingly connected to the third inner ring gear, the third inner ring gear connected to the ring gear holder, and the ring gear holder connected to the climbing gear shaft.

7. The composite planetary structure lifting gearbox according to claim 6, characterized in that: The third planetary gear shaft is connected to the middle part of the housing through a third rolling bearing, the third planetary gear is interference connected to the third planetary gear shaft, and the third planetary gear is meshedly connected to the third sun gear.

8. The composite planetary structure lifting gearbox according to claim 6, characterized in that: The third inner gear ring is meshedly connected to the third planetary gear shaft, and the third inner gear ring is connected to the gear ring holder through bolts, and the gear ring holder is rotatably connected to the housing.

9. The composite planetary structure lifting gearbox according to claim 8, characterized in that: The climbing gear shaft is connected to one end of the gear ring holder through a spline, and the middle part of the climbing gear shaft is connected to the second end of the housing through a sixth rolling bearing.

10. The composite planetary structure lifting gearbox according to claim 9, characterized in that: A groove and a positioning step are arranged on the outer peripheral side surface of the climbing gear shaft, a retaining ring is arranged in the groove, the retaining ring abuts against the left end surface of the inner ring of the sixth rolling bearing, and the positioning step abuts against the right end surface of the inner ring of the sixth rolling bearing.

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