Driving assembly for electric ship with two-stage planet row driven by double motors

Abstract

The utility model relates to a driving assembly for an electric ship with two-stage planet rows driven by double motors, which comprises two driving motors, a confluence gear box component and a planetary reducer component which are sequentially arranged, and the confluence gear box component is respectively arranged at the output ends of the two driving motors, serves as a first-stage gear transmission device and is positioned in the middle of the driving assembly; an input shaft assembly and an input shaft which are oppositely arranged are arranged between the confluence gearbox assemblies, and confluence gears are matched between the input shaft assembly and the input shaft; the output end of the confluence gear is connected with the input end of the planetary reducer assembly; forward and reverse output of the driving assembly is achieved through forward and reverse rotation of the two driving motors, and then ahead running and reversing of the ship are achieved. Through matching of the planet row and the motor, the problems of ahead running and reverse reversing are solved, meanwhile, based on the transmission characteristics of the planet row, the transmission ratio range is greatly widened, large-torque transmission is achieved under the small size and weight, and the transmission efficiency, vibration, noise and other aspects are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to drive technical field more particularly, relate to a kind of two-stage planetary gear set electric drive assembly for electric ship of double-motor drive. BACKGROUND

[0002] At present, in ship propulsion system, medium and high speed diesel engine drives fixed pitch propeller through gear box, and fixed pitch propeller gear box generally has the functions of reduction, clutching and reversing. The traditional fixed pitch propeller gear box usually adopts parallel shaft fixed shaft gear transmission, and the forward and reverse directions are changed by clutch. In this transmission mode, the forward direction is usually single-stage gear transmission, and the reverse direction needs two-stage transmission, which has problems such as large size, heavy weight, insufficient speed ratio range, etc.

[0003] Planetary gear transmission has the characteristics of compact structure, high power density and high transmission efficiency, and the use of planetary transmission in fixed pitch propeller gear box can effectively reduce the size and weight, and realize lightweight.

[0004] Through retrieval, CN119217956A discloses a two-gear hybrid power transmission box with U-shaped stator double-motor double-planetary gear set configuration. The coaxial arrangement of two motors (drive motor EM2 and generator motor EM1) sharing one stator greatly shortens the axial size of the entire transmission box. The configuration with double planetary gear sets and gear shifting improves the speed ratio range and reduces the requirements for motor speed variation range and torque. The transmission box has higher transmission efficiency, higher integration, easy layout, fewer components and lower cost.

[0005] However, this structure is not suitable for ship gear box, and cannot solve the problem of using planetary gear transmission in ship gear box and solving the reversing problem by matching with motor. UTILITY MODEL CONTENTS

[0006] The utility model provides a two-stage planetary gear set electric drive assembly for electric ship of double-motor drive to solve the problems of forward and reverse direction change by matching planetary gear set with motor. Based on the transmission characteristics of planetary gear set, the transmission ratio range is greatly improved, and large torque transmission is realized under smaller size and weight. Since the host engine is driven by motor, the transmission efficiency, vibration and noise are also greatly improved compared with traditional diesel engine.

[0007] The above-mentioned purposes of the utility model are realized by the following technical solutions:

[0008] Disclosed is an electric ship drive assembly with a double-motor driving two-stage planetary gear train, comprising two driving motors, a confluence gearbox assembly and a planetary reducer assembly arranged in sequence, the confluence gearbox assembly being arranged at the output ends of the two driving motors as a first-stage gear transmission device and located in the middle of the drive assembly; the confluence gearbox assembly comprises oppositely arranged input shaft assemblies and an input shaft, the input shaft assemblies and the input shaft being fitted with a confluence gear; the output end of the confluence gear is connected with the input end of the planetary reducer assembly; the forward and reverse output of the drive assembly is realized through the forward and reverse rotation of the two driving motors, and the forward and reverse direction of the ship is realized.

[0009] Further, the confluence gearbox assembly comprises a gearbox assembly; the gearbox assembly is provided with an input shaft assembly comprising an input shaft connected with the driving motor, and a gear engagement sleeve and an input gear are arranged outside the input shaft.

[0010] Further, the input shaft has segmented shafts with different diameters, one end of which is provided with a first external spline segment connected with the driving motor, and the other end is provided with a second external spline segment engaged with the gear engagement sleeve; the external spline segments are arranged side by side, and a front bearing, the gear engagement sleeve, the input gear and a rear bearing are sequentially arranged on the assembly shaft segment.

[0011] Further, the gear engagement sleeve is provided with internal splines on the inner side, and the gear engagement sleeve is provided with a concave annular groove on the inner and outer sides. The input gear is assembled on the input gear shaft segment of the input shaft through a needle bearing and can rotate freely.

[0012] Further, the planetary reducer assembly comprises a first-stage planetary assembly, a second-stage planetary assembly, an output flange and a flange locking nut arranged inside a planetary gear ring; the first-stage planetary assembly comprises a confluence gear shaft, one end of which extends into the gearbox assembly and cooperates with the confluence gear.

[0013] Further, the outer edge of the confluence gear shaft is provided with a first-stage planetary gear, and the confluence gear shaft is a stepped shaft with segmented shafts with different diameters, one end of which near the gearbox assembly is provided with a spline, and the confluence gear is assembled on the shaft through the spline; a front bearing, a first-stage sun gear and a rear bearing segment are sequentially arranged near the spline.

[0014] Further, the second-stage planetary assembly comprises a second-stage planetary gear, a second-stage sun gear and a second-stage planet carrier; the second-stage planetary gear is provided with an inner hole one distributed on the second-stage planet carrier along the circumference; the second-stage sun gear is provided with an inner hole two which is loosely sleeved on the second-stage sun gear segment of the confluence gear shaft through a needle bearing.

[0015] Further, the gear tooth portion of the secondary sun gear comprises external splines meshing with the inner hole of the primary planet carrier, and a involute tooth profile meshing with the secondary planet gear.

[0016] Further, one side of the secondary planet carrier is provided with a plurality of light shafts distributed along the circumference for supporting the secondary planet gear; the other side is sequentially provided with a bearing support section, a flange spline matching section and a locking thread section.

[0017] Further, the end of the planet carrier away from the combined gear box assembly is provided with an output flange, which is connected with the secondary planet carrier through splines to realize power transmission; the length of the internal spline of the output flange exceeds that of the external spline, and the relative fixation between the output flange and the secondary planet carrier is realized through the pressing force generated by tightening of the locking nut.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model discloses a double motor drive two-stage planetary row's electric ship drive assembly, realizes the positive and negative output of drive assembly through the positive and negative rotation of motor, and further realizes the forward and reverse direction of ship.

[0020] The utility model realizes the self -adaptation selection of ship power machine, can select one power machine intervention or interrupt power input according to the actual operation demand of ship, reduces the invalid loss, and improves energy utilization rate.

[0021] The utility model utilizes the characteristics of compact planetary gear structure and large transmission speed ratio range, effectively reduces the size and weight of the whole, and realizes light weight.

[0022] Through motor drive, compared with traditional diesel engine, transmission efficiency is greatly improved, and vibration and noise problems are optimized. DRAWINGS

[0023] The drawings accompanying the specification provide further understanding of the utility model, and the schematic embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute improper limitation to the utility model.

[0024] Fig. 1 It is the power transmission diagram of the double motor drive two-stage planetary row's electric ship drive assembly.

[0025] Fig. 2 It is the structural schematic diagram of the double motor drive two-stage planetary row's electric ship drive assembly.

[0026] Fig. 3The utility model discloses a double motor drive two-stage planetary array's electric control gear hanging mechanism's structural diagram of electric drive assembly for electric ship.

[0027] Wherein, 1-drive motor, 2-merge gear box assembly, 21-box assembly, 22-input shaft assembly, 221-input shaft, 222-gear engagement sleeve, 223-input gear, 23-input shaft, 24-merge gear, 25-gear shift yoke, 26-gear shift shaft, 27-electric control gear hanging mechanism, 3-planetary reducer assembly, 31-first stage planetary assembly, 311-merge gear shaft, 312-first stage planetary gear, 32-second stage planetary assembly, 321-second stage planetary gear, 322-second stage sun gear, 323-second stage planet carrier, 33-planetary gear, 34-output flange, 35-flange locking nut. DETAILED DESCRIPTION

[0028] The embodiments of the utility model are explained in detail below in combination with the drawings, but the utility model can be implemented in multiple different ways limited and covered by the claims. Embodiment 1

[0029] As Figs. 1-3 Shown, the double motor drive two-stage planetary array's electric drive assembly for electric ship of this embodiment, including two drive motors 1, merge gear box assembly 2 and planetary reducer assembly 3 set gradually, and merge gear box assembly 2 is divided at the output end of two drive motors 1, as first stage gear transmission device, is located in the middle part of drive assembly;Merge gear box assembly 2 interval includes oppositely arranged input shaft assembly 22 and input shaft 23, and input shaft assembly 22 and input shaft 23 are matched with merge gear 24;In this embodiment, the output end of merge gear 24 is connected with the input end of planetary reducer assembly 3;Merge gear 24 is cylindrical gear and is located inside merge gear box assembly 2 and is distributed between input shaft assembly 22 and input shaft 23, and is engaged with input gear 223, input shaft 23. The forward and reverse output of drive assembly is realized through the forward and reverse rotation of two drive motors 1, and then the forward and reverse direction of ship is realized.

[0030] Merge gear box assembly 2 includes box assembly 21;Box assembly 21 is provided with input shaft assembly 22 in it, including input shaft 221 connected with drive motor 1, gear engagement sleeve 222 and input gear 223 are arranged on the outside of input shaft 221. Input shaft 221 has segmented section with different shaft diameters, one end of which is provided with a first external spline section connected with the drive motor;The other end is provided with a second external spline section engaged with gear engagement sleeve 222;With the external spline section side by side, the assembly shaft section of front bearing, gear engagement sleeve 222, input gear 223 and rear bearing is sequentially arranged.

[0031] The shift sleeve 222 is internally provided with internal splines, and the shift sleeve 222 is externally provided with a concave annular groove. Specifically, the shift sleeve 222 is a circular ring device with a certain thickness, and the outer wall is provided with a groove, and the inner surface is provided with internal splines, which are connected with the shift sleeve shaft segment on the input shaft 221 in spline connection.

[0032] Furthermore, the input gear 223 is a cylindrical gear piece with an internal through hole, and the outer wall is provided with at least two segments with different diameters, wherein the rear segment is a gear segment, and the front segment is provided with external splines which are consistent with the external splines of the shift sleeve shaft segment on the input shaft 1, and can be connected with the shift sleeve 222 in spline connection. The input gear 223 is assembled on the input gear shaft segment of the input shaft 221 through a needle bearing, and can rotate freely.

[0033] In the embodiment, the electric control shift mechanism 27 is assembled on the outer wall of the merging gear box assembly 2, and includes a shift actuator 271 and a shift motor 272. The shift actuator 271 is a ball screw device, and the rotation of the screw shaft makes the screw guide block move forward and backward through the thread. The front end of the screw shaft is provided with a one-character groove or internal splines to be connected with the shift motor. The cross section of the screw guide block is Y-shaped, and the shift guide block passes through the guide rod through the internal hole provided in the middle part. The two sides of the shift guide block above are protruded to form a structure of a middle groove, hold the ball screw guide block, and cooperate with the groove on the outer surface of the screw guide block. The lower protruding short wall structure is the final output of the shift mechanism.

[0034] The shift motor 272 can be a brushless motor, which is the prime mover of the electric control shift mechanism, and the output shaft is a one-character shaft or a small modulus external spline.

[0035] The shift shaft 26 is a cylindrical light pole which is located directly below the screw shaft and parallel to the screw shaft, but the two ends of the shift shaft 26 are provided with grooves, and the shift shaft 26 can be controlled in axial position by the steel ball entering and exiting the groove, thereby realizing the short distance movement in the axial direction.

[0036] The shift fork 25 is Y-shaped with the upper and lower parts being turned over, and the middle part is provided with an internal hole. The shift fork 25 passes through the shift shaft and is assembled thereon through the internal hole, and the axial position is fixed. The upper part of the shift fork 25 is protruded in a short wall structure, and the internal hole is provided with a groove, and the lower short wall of the shift guide block is embedded in the groove. The lower part is a structure with two protruding sides and a middle annular recess, and the two protruding parts are embedded in the concave annular groove of the shift sleeve 222, and the shift sleeve is pushed to move axially.

[0037] The driving motor 1 of the embodiment is located at the front end of the driving assembly as a prime mover to provide power. The box assembly 21 is a containing device of the combined gear box assembly, which includes a box, bearings, oil seals and other related accessories. The input shaft assembly 22, the input shaft 23 and the combined gear 24 are assembled in the box through bearings. The driving motor 1 is bolted to the front end face of the box. Meanwhile, an opening is provided on the upper part of the outer wall of the box, and the opening position corresponds to the input shaft assembly 22. The electric control gear shifting mechanism 27 is bolted to the position and partially penetrates into the box through the opening.

[0038] In the embodiment, the planetary reducer assembly 3 includes a first planetary assembly 31, a second planetary assembly 32, an output flange 34 and a flange locking nut 35 arranged inside the planetary gear ring 33. The first planetary assembly 31 includes a combined gear shaft 311, one end of which extends into the box assembly 21 and cooperates with the combined gear 24.

[0039] The outer edge of the combined gear shaft 311 is provided with a first planetary gear 312. The combined gear shaft 311 is at least a stepped shaft with different shaft diameters. A spline is arranged at the front end of the shaft, and the combined gear 24 is assembled on the shaft through the spline. A front bearing, a first sun gear and a rear bearing segment are arranged in sequence near the spline side. The first sun gear segment is processed with a tooth shape, which is required to be consistent with the first planetary gear 312. The teeth of the first sun gear are engaged with the first planetary gear.

[0040] The second planetary assembly 32 includes a second planetary gear 321, a second sun gear 322 and a second planetary carrier 323. The second planetary gear 321 is provided with an inner hole one distributed on the second planetary carrier 323. The second sun gear 322 is provided with an inner hole two which is sleeved on the second sun gear 322 segment of the combined gear shaft 311 through a needle bearing. The teeth part of the second sun gear 322 includes an outer spline engaged with the inner hole of the first planetary carrier 313 and an involute tooth shape engaged with the second planetary gear 321. One side of the second planetary carrier 323 is provided with a plurality of light shafts distributed along the circumference for supporting the second planetary gear. The other side is sequentially provided with a bearing support segment, a flange spline matching segment and a locking thread segment.

[0041] The output flange 34 is arranged at the rear end of the planetary gear ring 33 and is connected with the rear protruding segment of the second planetary carrier 323 through a spline to realize power transmission. The inner spline length of the output flange 34 exceeds the outer spline, and the relative fixation between the output flange 34 and the second planetary carrier 323 is realized through the compression force generated by tightening the locking nut 35.

[0042] The planetary gear ring 33 of the embodiment is a two-section stepped columnar body with a certain wall thickness, the inner wall of the front section of which is provided with involute gear teeth, the first planetary assembly 31 and the second planetary assembly 32 are located in the front section of the planetary gear ring 33, and the gear teeth of the first planetary gear 312 and the second planetary gear 321 are internally meshed with the involute gear teeth respectively. The second planetary carrier 323 passes through the rear section of the planetary gear ring 33 and continues to protrude backward and is provided with two groups of bearings as the support of the second planetary carrier 323 and the planetary gear ring 33.

[0043] The output flange 34 is located at the rear end of the planetary gear ring 33 and is provided with an inner spline hole, which is connected with the rear protruding section of the second planetary carrier 323 through spline connection to realize the transmission of received power. The length of the inner spline of the output flange 34 slightly exceeds the length of the outer spline, and the relative fixation between the output flange 34 and the second planetary carrier 323 is realized through the pressing force generated by the tightening of the locking nut 35. The front section of the output flange 34 is partially deep into the rear section of the aforementioned planetary gear ring, and a sealing element is arranged between the two.

[0044] When the ship needs to sail under the working condition of large torque and high speed, the electric control gear shifting mechanism 27 drives the gear shifting yoke 25 to move along the gear shifting shaft 26 backward through the gear shifting motor to lock the input gear and the input shaft, thereby completing the gear shifting. At this time, the two drive motors provide power simultaneously to drive the ship to sail at high speed and high torque. The specific power transmission route is: (drive motor 1-input shaft assembly 22) / (drive motor 1-input shaft 23)-converging gear 24-converging gear shaft 311-first planetary gear 312-first planetary carrier 313-second sun gear 322-second planetary gear 321-second planetary carrier 323-output.

[0045] When the ship needs to sail under the working condition of small torque and low speed, the electric control gear shifting mechanism 27 drives the gear shifting yoke 25 to move forward along the gear shifting shaft 26 through the gear shifting motor to return to the gear shifting disengagement position and interrupt the power transmission. At this time, only one motor provides power, and the input shaft assembly 22 does not participate in power transmission, and the specific power transmission route is: drive motor 1-input shaft 23-converging gear 24-converging gear shaft 311-first planetary gear 312-first planetary carrier 313-second sun gear 322-second planetary gear 321-second planetary carrier 323-output.

[0046] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. An electric marine drive assembly with dual motors driving a two-stage planetary gear setter, characterized in that, The system includes two drive motors (1), a confluence gearbox assembly (2), and a planetary reducer assembly (3) arranged sequentially. The confluence gearbox assembly (2) is located at the output ends of the two drive motors (1) and serves as the first-stage gear transmission device, situated in the middle of the drive assembly. The confluence gearbox assembly (2) includes an input shaft assembly (22) and an input shaft (23) arranged opposite to each other. A confluence gear (24) is fitted between the input shaft assembly (22) and the input shaft (23). The output end of the confluence gear (24) is connected to the input end of the planetary reducer assembly (3). The forward and reverse rotation of the two drive motors (1) enables the drive assembly to output in both directions, thereby achieving forward and reverse direction changes for the ship.

2. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 1, characterized in that, The confluence gearbox assembly (2) includes a housing assembly (21); an input shaft assembly (22) is provided inside the housing assembly (21), including an input shaft (221) connected to the drive motor (1), and a gear engagement sleeve (222) and an input gear (223) are provided on the outside of the input shaft (221).

3. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 2, characterized in that, The input shaft (221) has segments with different shaft diameters. One end of the input shaft is provided with a first external spline segment, which is connected to the drive motor. The other end is provided with a second external spline segment, which meshes with the gear engagement sleeve (222). Alongside the external spline segment, there is an assembly shaft segment with a front bearing, a gear engagement sleeve (222), an input gear (223), and a rear bearing arranged in sequence.

4. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 3, characterized in that, The gear engagement sleeve (222) has an inner spline on its inner side, and the gear engagement sleeve (222) has concave annular grooves on its inner and outer sides.

5. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 4, characterized in that, The planetary reducer assembly (3) includes a first-stage planetary assembly (31), a second-stage planetary assembly (32), an output flange (34), and a flange locking nut (35) disposed inside the planetary gear ring (33); the first-stage planetary assembly (31) includes a confluence gear shaft (311), one end of which extends into the housing assembly (21) and engages with the confluence gear (24).

6. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 5, characterized in that, The outer edge of the confluence gear shaft (311) is provided with a first-stage planetary gear (312). The confluence gear shaft (311) is a stepped shaft with different shaft diameter segments. The shaft end near the confluence gearbox assembly (2) is provided with a spline. The confluence gear (24) is assembled on the shaft through the spline. The front bearing, the first-stage sun gear, and the rear bearing segments are arranged in sequence near the spline. The first-stage sun gear is machined with a tooth profile, which is required to be consistent with the first-stage planetary gear (312). The teeth of the first-stage sun gear mesh externally with the first-stage planetary gear.

7. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 6, characterized in that, The secondary planetary assembly (32) includes a secondary planetary gear (321), a secondary sun gear (322), and a secondary planetary carrier (323); the secondary planetary gear (321) has an inner hole distributed circumferentially on the secondary planetary carrier (323); the secondary sun gear (322) has an inner hole and is loosely fitted on the secondary sun gear (322) segment of the confluence gear shaft (311) through a needle roller bearing.

8. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 7, characterized in that, The gear teeth of the second-stage sun gear (322) include an external spline that meshes with the inner bore of the first-stage planet carrier (313) and an involute tooth profile that meshes with the outer bore of the second-stage planet gear (321).

9. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 8, characterized in that, The secondary planetary carrier (323) has multiple optical shafts distributed along the circumference on one side for supporting the secondary planetary gears; the other side has a bearing support section, a flange spline mating section, and a locking thread section in sequence.

10. The electric marine drive assembly with dual motors driving a two-stage planetary gear set according to claim 9, characterized in that, The planetary gear ring (33) is provided with an output flange (34) on the side away from the confluence gearbox assembly (2), which is connected to the secondary planetary carrier (323) by a spline to realize the transmission of power. The inner spline of the output flange (34) extends beyond the outer spline, and the clamping force generated by tightening the locking nut (35) realizes the relative fixation between the output flange (34) and the secondary planetary carrier (323).

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