Built-in differential mechanism motor of planet gear transmission system
By integrating the planetary gear transmission system of the motor, transmission and differential, the problems of large assembly space and uneven gravity caused by separate assembly on the wheelchair are solved, and the compact and stable power structure of the wheelchair is achieved.
Patent Information
- Application Number
- CN202421646475.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The existing differential is assembled separately on a light and small device such as a wheelchair, resulting in the assembly structure taking up a large space and uneven distribution of gravity.
The motor, transmission and differential are integrated into one assembly, and a planetary gear transmission system is used to achieve synchronous connection between the motor rotor and the differential. The sun gear of the planetary gear system is coaxially sleeved on the outside of the output shaft through a bearing, and the ring gear is fixedly connected to the inner wall of the motor housing. The planetary gears are nylon silent gears.
The assembly volume of the wheelchair's power structure is effectively reduced, gravity is concentrated in the center, the problem of uneven gravity distribution is solved, and the wheelchair is more stable.
Smart Images
Figure CN223451757U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor field. BACKGROUND
[0002] Differential is a kind of classic transmission structure, and is widely applied in vehicle steering structure, differential generally includes a rotating input end and two rotating output ends, the rotating input end of differential is used to connect transmission output end, differential has torque distribution function, under normal circumstances, differential evenly distributes the torque received by input end to two output ends;This means that under normal circumstances, the torque obtained by left and right drive wheels from differential is equal;However, when vehicle turns, since the running distance of left and right wheels is different, they need to rotate at different speeds;Differential allows the difference in rotating speed of two output ends, so as to meet this demand.
[0003] At present, differential is widely applied in market;Most differentials, transmissions and motors are assembled separately, and this kind of separate assembly structure is reasonable in large vehicle system such as automobile;
[0004] However, when differential is applied to wheelchair and other light and small devices, it will cause the problems of large space occupied by assembly structure and unbalanced gravity distribution. SUMMARY
[0005] The utility model provides a kind of built-in differential motor of planetary gear train to overcome the deficiencies in the prior art, motor, speed change and differential are integrated in one assembly, effectively reduce the assembly volume of power structure of wheelchair, solve the problem of unbalanced gravity distribution caused by differential, transmission and motor three separate assembly.
[0006] Technical scheme: to achieve the above object, a kind of built-in differential motor of planetary gear train of the utility model, including motor stator, motor rotor, differential and planetary gear train;Differential includes a rotating input end and two rotating output ends;Motor rotor is drivenly connected with the rotating input end of differential by planetary gear train, and the two output ends of differential are respectively drivenly connected with a output shaft and b output shaft of coaxial center;Motor rotor is synchronously connected with sun gear of planetary gear train, and sun gear is coaxially sleeved on b output shaft outside by bearing.
[0007] Further, planetary gear train is composed of ring gear, sun gear, planetary gear carrier and planetary gear;Ring gear is fixed part, and planetary gear carrier is synchronously connected with the rotating input end of differential.
[0008] Further, planetary gear is nylon silent gear.
[0009] Further, a output shaft and b output shaft are respectively synchronously connected with a wheel and b wheel.
[0010] Further, the motor housing, the motor stator, the motor rotor, the differential and the planetary gear train are all installed in the motor housing.
[0011] Further, the outer ring of the ring gear is fixedly connected to the inner wall of the motor housing coaxially.
[0012] Beneficial effects: the motor, the transmission and the differential are integrated in one assembly, effectively reducing the assembly volume of the power structure of the wheelchair; at the same time, the planetary gear train, the differential and the stator and rotor are coaxial structures, so that the gravity is concentrated in the center of the power assembly, thereby solving the problem of uneven gravity distribution caused by separate assembly of the differential, the transmission and the motor, making the wheelchair more stable. BRIEF DESCRIPTION OF DRAWINGS
[0013] ATTACHED Figure 1 is a transmission diagram of the present scheme. DETAILED DESCRIPTION
[0014] The present utility model will be further described below in combination with the drawings.
[0015] The present case is specifically applied in the field of light electric drive wheelchair, such as the built-in differential motor of planetary gear transmission system shown in the attached Figure 1 The built-in differential motor of planetary gear transmission system comprises a motor stator 2, a motor rotor 11, a differential 5 and a planetary gear train, further comprises a motor housing 6, the motor stator 2, the motor rotor 11, the differential 5 and the planetary gear train are all installed in the motor housing 6, the integration degree is high, effectively reducing the assembly volume of the power structure of the wheelchair.
[0016] The specific cooperation relationship of the motor stator 2 and the motor rotor 11 of the present case is not particularly limited, which can be an outer rotor motor or an inner rotor motor, and the outer rotor motor is shown in the attached drawings.
[0017] The planetary gear train is composed of a ring gear 9, a sun gear 10, a planetary gear carrier 7 and a planetary gear 8; the differential 5 of the present case is a conventional gear type differential, the differential 5 comprises a rotating input end and two rotating output ends; the motor rotor 11 is driven and connected to the rotating input end of the differential 5 through the planetary gear train, the two output ends of the differential 5 are respectively driven and connected to the coaxial a output shaft 3 and b output shaft 4; the motor rotor 11 and the sun gear 10 of the planetary gear train are synchronously connected through fixed connection, the sun gear 10 is coaxially sleeved on the outside of the b output shaft 4 through the bearing 15, so that the planetary gear train, the differential and the stator and rotor are coaxial structures, so that the gravity is concentrated in the center of the power assembly, thereby solving the problem of uneven gravity distribution caused by separate assembly of the differential, the transmission and the motor, making the wheelchair more stable.
[0018] The gear ring 9 is a fixed part, and the outer ring of the gear ring 9 is fixedly connected to the inner wall of the motor housing 6 coaxially, and the planetary gear carrier 7 is synchronously connected to the rotating input end of the differential 5; in order to improve the mute effect, the planetary gear 8 is a nylon mute gear; the a output shaft 3 and the b output shaft 4 are synchronously connected to the a wheel 1 and the b wheel 2 respectively.
[0019] Transmission principle:
[0020] When the wheelchair is running, the motor rotor 11 rotates under the driving of the motor, and the motor rotor 11 drives the sun gear 10 to rotate synchronously, and then the sun gear 10, the planetary gear carrier 7 and the planetary gear 8 jointly constitute a planetary gear train, and the speed change is output to the rotating input end of the differential 5, the power from the planetary gear train is distributed to the two output ends by the gear or shaft system in the differential 5, and finally the a output shaft 3 and the b output shaft 4 are distributed to the a wheel 1 and the b wheel, under normal circumstances, the differential will evenly distribute the torque received by the input end to the two output ends, which means that under normal circumstances, the a wheel 1 and the b wheel obtain equal torque from the differential 5; however, when the wheelchair turns, because the running distances of the a wheel 1 and the b wheel are different, they need to rotate at different speeds, and the differential 5 allows the two output ends to have a difference in rotating speed, thereby meeting this demand.
[0021] The utility model integrates the motor, the speed changer and the differential in one assembly, effectively reduces the assembly volume of the power structure of the wheelchair; at the same time, the planetary gear train, the differential and the stator and rotor are coaxial structures, so that the gravity is concentrated in the center of the power assembly, thereby solving the problem of uneven gravity distribution caused by separate assembly of the differential, the speed changer and the motor, and making the wheelchair more stable.
[0022] The above is only the preferred embodiment of the utility model, and it should be pointed out that: for ordinary skilled persons in the technical field, under the premise of not departing from the principle of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection range of the utility model.
Claims
1. A motor with a built-in differential in a planetary gear transmission system, characterized in that: The invention comprises a motor stator (12), a motor rotor (11), a differential (5) and a planetary gear train; the differential (5) comprises a rotation input end and two rotation output ends; the motor rotor (11) is driven to connect to the rotation input end of the differential (5) through the planetary gear train, and the two output ends of the differential (5) are respectively driven to connect to the coaxial output shaft a (3) and the coaxial output shaft b (4); the motor rotor (11) is synchronously connected to the sun gear (10) of the planetary gear train, and the sun gear (10) is coaxially sleeved on the outside of the output shaft b (4) through a bearing (15).
2. The built-in differential motor of a planetary gear transmission system according to claim 1, characterized in that: The planetary gear train is composed of a ring gear (9), a sun gear (10), a planetary gear carrier (7) and a planetary gear (8); the ring gear (9) is a fixed component, and the planetary gear carrier (7) is synchronously connected to the rotation input end of the differential (5).
3. The built-in differential motor of a planetary gear transmission system according to claim 2, characterized in that: The planetary gear (8) is a nylon silent gear.
4. The built-in differential motor of a planetary gear transmission system according to claim 3, characterized in that: Output shaft a (3) and output shaft b (4) are synchronously connected to wheel a (1) and wheel b (2) respectively.
5. The built-in differential motor of a planetary gear transmission system according to claim 4, characterized in that: It also includes a motor housing (6), wherein the motor stator (12), the motor rotor (11), the differential (5) and the planetary gear train are all installed in the motor housing (6).
6. The built-in differential motor of a planetary gear transmission system according to claim 5, characterized in that: The outer ring of the gear ring (9) is coaxially fixedly connected to the inner wall of the motor housing (6).