Integrated motor structure of integrated differential mechanism

Abstract

The invention discloses an integrated motor structure of an integrated differential mechanism, which comprises a motor shell, a front end cover, a rear end cover, a first main shaft, a second main shaft, a rotor, a stator, a differential shaft, a first gear, a second gear, a third gear and a fourth gear, the first gear is arranged at the front end of the first main shaft, the second gear is arranged on the second main shaft, the third gear and the fourth gear are arranged on the differential shaft in a spaced mode, the first gear is meshed with the third gear, and the second gear is meshed with the fourth gear. The coaxial integrated design of the motor and the differential mechanism is adopted, on one hand, the number of middle transmission parts is reduced, installation space is saved, energy loss is reduced, and then the transmission efficiency of the motor is improved, and on the other hand, due to the fact that the number of parts is reduced, the overall weight of the motor is remarkably reduced; and the dynamic performance of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an integrated motor structure with an integrated differential. Background Art

[0002] In new energy vehicles, electric commercial vehicles, and other sectors, electric motors are crucial drive components. In practical applications, motors are often used in conjunction with a differential to facilitate vehicle steering. A traditional differential primarily consists of left and right axle gears, two planetary gears, a gear carrier, and multiple drive shafts. The motor's power enters the differential through the drive shaft, directly driving the gear carrier. The planetary gears then drive the left and right axles, respectively, to rotate the left and right wheels.

[0003] Because the motor and differential are inherently large, they occupy a significant amount of vehicle space, making reducing their size a challenge for the industry. However, the motor's power is generally proportional to its size, and its size cannot be further reduced while ensuring power levels meet requirements. Therefore, the only solution to this space issue is to rationally design the structural layout of the motors.

[0004] To this end, an improvement scheme has been proposed in the prior art, such as the rear axle assembly in which a differential and a direct-drive motor are integrated, as disclosed in patent CN112356663A. The rotor shaft is a hollow structure, and a differential motor housing is provided outside the differential. The differential motor housing includes a left differential case and a right differential case. The left differential gear is installed in the left differential case, and the right differential gear is installed in the right differential case. The left differential case and the right differential case are both tightly fitted with the hollow rotor shaft or welded or screwed together, and the hollow rotor shaft assumes the function of a differential cage.

[0005] However, the above solution still has the following two problems:

[0006] First, the differential is placed in the internal cavity of the rotor shaft, which will significantly increase the diameter of the rotor shaft, and the space left for the rotor and stator will become smaller accordingly. In order to ensure the power performance of the motor, the overall volume of the motor has to be increased, but the space occupied by the motor and differential is not solved.

[0007] Second, since the differential is set inside the rotor shaft, this poses a problem for future lubrication, maintenance or repair of the differential. Once the differential fails, the entire machine has to be disassembled, which is very troublesome.

[0008] To this end, the present application proposes an integrated motor structure with an integrated differential to solve the above problems. Summary of the Invention

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] The first gear is arranged on the front end of the first main shaft, the second gear is arranged on the second main shaft, and the third gear is arranged on the third gear of the differential shaft.

[0011] Furthermore, a rotating bracket is provided inside the motor housing, and the second main shaft is rotatably connected to the inner side of the rotating bracket.

[0012] Furthermore, a groove is provided at the front end of the first main shaft, and a connecting shaft is provided at the rear end of the second main shaft, and the connecting shaft is rotatably arranged in the groove.

[0013] Furthermore, the outer walls of the motor housing, the front cover and the rear cover are all provided with a plurality of bolt slots, and the plurality of bolt slots located on the same straight line are connected through tie rod bolts.

[0014] Furthermore, the transmission ratios of the first gear, the third gear, the fourth gear, and the second gear are 2-3:4-6:1-2:5-8.

[0015] Furthermore, a first lubrication hole is provided at a position on the top of the differential housing corresponding to the third gear, and a first screw plug is provided on the first lubrication hole.

[0016] Furthermore, a second lubrication hole is provided at a position on the bottom of the front end cover corresponding to the second gear, and a second screw plug is provided on the second lubrication hole.

[0017] Furthermore, the first main shaft and the rear end cover are rotatably connected via a first bearing, and the second main shaft and the front end cover are rotatably connected via a second bearing.

[0018] Furthermore, both ends of the differential shaft are rotationally connected to the motor housing and the differential housing through third bearings respectively.

[0019] Furthermore, the first main shaft and the second main shaft are rotatably connected to the rotating bracket via a fourth bearing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adopts a coaxial integrated design of the motor and the differential, and does not require the arrangement of a planetary gear set, a gear rack and other structures. On the one hand, the number of intermediate transmission components is reduced, installation space is saved, energy loss is reduced, and the transmission efficiency of the motor is improved. On the other hand, due to the reduction in parts, the overall weight of the motor is also significantly reduced, which is beneficial to improving the dynamic performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is an axial structural cross-sectional view of the present invention.

[0025] Reference numerals:

[0026] 1-motor housing, 2-front end cover, 3-rear end cover, 4-first main shaft, 5-second main shaft, 6-rotor, 7-stator, 8-differential shaft, 9-first gear, 10-second gear, 11-third gear, 12-fourth gear, 13-differential housing, 14-bolt groove, 15-pull rod bolt, 16-sealing gasket, 17-rotating bracket, 18-groove, 19-connecting shaft, 20-first lubrication hole, 21-first plug screw, 22-second lubrication hole, 23-second plug screw, 24-first bearing, 25-second bearing, 26-third bearing, 27-fourth bearing. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0030] In the description of the embodiments, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections, connections through an intermediary medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention.

[0031] like Figure 1-2 As shown, the integrated motor structure with integrated differential in this embodiment includes a motor housing 1, a front end cover 2, a rear end cover 3, a first main shaft 4, a second main shaft 5, a rotor 6, a stator 7, a differential shaft 8, a first gear 9, a second gear 10, a third gear 11 and a fourth gear 12. The front end cover 2 and the rear end face 3 are fixedly arranged on the front and rear sides of the motor housing 1 respectively. The front side of the motor housing 1 and the rear side of the front end cover 2 are both provided with a differential housing 13 protruding outward. The outer walls of the motor housing 1, the front end cover 2 and the rear end cover 3 are all provided with a plurality of bolt grooves 14. The plurality of bolt grooves 14 located on the same straight line are connected through by pull rod bolts 15, and a sealing gasket 16 is provided between the differential housings 13 on both sides; the detachable design of the differential housing 13 facilitates maintenance of the differential.

[0032] The first main shaft 4 and the second main shaft 5 are arranged along the central axis of the motor housing 1, the rotor 6 is coaxial and fixedly arranged on the outside of the first main shaft 4, the stator 7 is fixedly arranged on the inner wall of the motor housing 1 and is located on the outside of the rotor 6, the first main shaft 4 extends from the rear side of the rear end cover 3, and the second main shaft 5 extends from the front side of the front end cover 2.

[0033] The differential shaft 8 is arranged in the differential housing 13 and is parallel to the first main shaft 4 and the second main shaft 5. The first gear 9 is arranged at the front end of the first main shaft 4, the second gear 10 is arranged on the second main shaft 5, and the third gear 11 and the fourth gear 12 are arranged at intervals on the differential shaft 8. The first gear 9 is engaged with the third gear 11, and the second gear 10 is engaged with the fourth gear 12. The transmission ratio among the first gear 9, the third gear 11, the fourth gear 12, and the second gear 10 can be reasonably selected between 2-3:4-6:1-2:5-8.

[0034] When the motor is working, the rotor 6 drives the first main shaft 4 to rotate, the first gear 9 on the first main shaft 4 drives the third gear 11 to rotate, the third gear 11 drives the fourth gear 12 to rotate through the differential shaft 8, the fourth gear 12 drives the second gear 10 to rotate, and the second gear 10 further drives the second main shaft 5 to rotate. Through the different transmission ratios between the gears, different speeds of the first main shaft 4 and the second main shaft 5 are achieved.

[0035] A rotating bracket 17 is provided within the motor housing 1, and the second spindle 5 is rotatably connected to the inner side of the rotating bracket 17. A groove 18 is provided at the front end of the first spindle 4, and a connecting shaft 19 is provided at the rear end of the second spindle 5. Connecting shaft 19 is rotatably mounted within groove 18. Both are pre-lubricated, for example, with grease, before installation. The arrangement of rotating bracket 17 and groove 18 provides rotational support for the second spindle 5.

[0036] A first lubrication hole 20 is provided at the top of the differential case 13, corresponding to the third gear 11. A first screw plug 21 is installed in this hole. A second lubrication hole 22 is provided at the bottom of the front end cover 2, corresponding to the second gear 10. A second screw plug 23 is installed in this hole. Lubricating grease can be applied to the third gear 11 and the second gear 10 through the first and second lubrication holes 20 and 22, respectively, ensuring the lubrication performance of the differential. Maintenance of the differential does not require disassembly.

[0037] The first main shaft 4 and the rear end cover 3 are rotatably connected via a first bearing 24, and the second main shaft 5 and the front end cover 2 are rotatably connected via a second bearing 25; the two ends of the differential shaft 8 are rotatably connected to the motor housing 1 and the differential housing 13 respectively via a third bearing 26; the first main shaft 4 and the second main shaft 5 are rotatably connected to the rotating bracket 17 via a fourth bearing 27.

[0038] To sum up, the present invention adopts a coaxial integrated design of the motor and the differential, and there is no need to set up structures such as a planetary gear set and a gear rack. On the one hand, it reduces the number of intermediate transmission components, saves installation space, reduces energy loss, and thus improves the transmission efficiency of the motor. On the other hand, due to the reduction in parts, the overall weight of the motor is also significantly reduced, which is beneficial to improving the dynamic performance of the vehicle.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. In addition, the technical solutions of the various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. An integrated motor structure with an integrated differential, characterized by: The transmission gear is connected with the transmission gear of the present invention to the transmission gear of the present invention, and the transmission gear is connected with the transmission gear of the present invention to the transmission gear of the present invention.

2. The integrated motor structure with integrated differential according to claim 1, characterized in that: A rotating bracket is provided inside the motor housing, and the second main shaft is rotatably connected to the inner side of the rotating bracket.

3. The integrated motor structure with integrated differential according to claim 2, characterized in that: A groove is provided at the front end of the first main shaft, and a connecting shaft is provided at the rear end of the second main shaft. The connecting shaft is rotatably arranged in the groove.

4. The integrated motor structure with integrated differential according to claim 1, characterized in that: The outer walls of the motor housing, the front cover and the rear cover are all provided with a plurality of bolt slots, and the plurality of bolt slots located on the same straight line are connected through tie rod bolts.

5. The integrated motor structure with integrated differential according to claim 1, characterized in that: The transmission ratios of the first gear, the third gear, the fourth gear and the second gear are 2-3:4-6:1-2:5-8.

6. The integrated motor structure with integrated differential according to claim 1, characterized in that: A first lubrication hole is provided at a position on the top of the differential housing corresponding to the third gear, and a first screw plug is provided on the first lubrication hole.

7. The integrated motor structure with integrated differential according to claim 6, characterized in that: A second lubrication hole is provided at a position on the bottom of the front end cover corresponding to the second gear, and a second screw plug is provided on the second lubrication hole.

8. The integrated motor structure with integrated differential according to claim 1, characterized in that: The first main shaft and the rear end cover are rotatably connected via a first bearing, and the second main shaft and the front end cover are rotatably connected via a second bearing.

9. The integrated motor structure with integrated differential according to claim 1, characterized in that: The two ends of the differential shaft are rotatably connected to the motor housing and the differential housing through third bearings respectively.

10. The integrated motor structure with integrated differential according to claim 2, characterized in that: The first main shaft and the second main shaft are rotatably connected to the rotating bracket via a fourth bearing.

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