Motor planet wheel mounting structure

Abstract

The utility model discloses a motor planet wheel installation structure which comprises an outer rotor, a sun wheel, a planet carrier and a plurality of planet wheels, the planet wheels are arranged on the planet carrier in a penetrating mode, the inner sides of the planet wheels are meshed with the sun wheel, the motor planet wheel installation structure further comprises a positioning bearing and a wall wheel which are coaxially arranged in the outer rotor, and the wall wheel is in interference fit with the outer rotor. The inner side of the wall wheel is meshed with the outer sides of the planet wheels, the positioning bearing is coaxially arranged outside the planet carrier, and the inner side and the outer side of the positioning bearing are attached to the outer wall of the planet carrier and the inner wall of the wall wheel respectively. The positioning bearing on the planet carrier is externally arranged, enough space is reserved for the design of the internal motor shaft and the sun gear, the size of the planet carrier can be further reduced, the outer diameter and the weight of the motor are greatly reduced, the inner side and the outer side of the planet gear are meshed and positioned with the sun gear and the wall gear respectively, and it is guaranteed that the form and location tolerance of the planet carrier and the planet gear is at the high precision level. And the output reliability of the motor is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of motor, especially a motor planetary wheel mounting structure. BACKGROUND

[0002] With the development of small high-speed planetary gear train drive, the weight, small size, quality, power density, torque and other index requirements of motor are higher and higher, and it becomes a difficult problem for the research and development personnel to develop a motor that can meet the driving requirements and make the volume and weight extremely small and light, the small high-speed planetary gear motor in the prior art mainly adopts an inner positioning type structure, the structure is suitable for solid shaft, and the size and the speed change space requirement is not high in the design direction, so that the overall size of the motor is large, and the weight is heavy, therefore, it is needed to improve. SUMMARY

[0003] The utility model discloses a kind of motor planetary wheel mounting structures to the defects that the overall weight of motor is large in prior art small high-speed planetary gear motor installation structure is built-in type installation and fixed, provide a new motor planetary wheel mounting structure.

[0004] To solve the above technical problem, the utility model realizes by the following technical scheme:

[0005] A kind of motor planetary wheel mounting structure, including outer rotor, sun gear, planet carrier and several planetary gears, the sun gear, planet carrier and several planetary gears are located in the inside of outer rotor, the planetary gear is arranged on planet carrier, the inside of the planetary gear is engaged with the sun gear, further including coaxially arranged in the positioning bearing and wall wheel of outer rotor, the wall wheel is in interference fit with outer rotor, the inside of the wall wheel is engaged with the outside of several planetary gears, the positioning bearing is coaxially arranged in the outside of planet carrier, the inside and the outside of the positioning bearing are respectively attached with the outer wall of planet carrier and the inner wall of wall wheel.

[0006] Positioning bearing is external on planet carrier, enough space is left for internal motor shaft and sun gear design, and the size of planet carrier can be further reduced, so that the motor outer diameter and motor weight are greatly reduced, the inside and the outside of planetary gear are respectively engaged with sun gear and wall wheel, and the shape tolerance of planet carrier and planetary gear is guaranteed on a high level of accuracy, and the stability and reliability of motor output are guaranteed.

[0007] As preferred, the above-mentioned motor planetary wheel mounting structure further includes a limiting bearing, the positioning bearing and the limiting bearing are respectively sleeved on the rear end and the front end of the planet carrier, and the inside and the outside of the limiting bearing are respectively attached with the inner wall of the outer rotor and the outer wall of the planet carrier.

[0008] The planet carrier adopts a positioning bearing and a limiting bearing to realize double-bearing positioning function, prevent planet carrier, planet wheel and wall wheel from having too large tolerance accumulation to cause unstable operation, and thus cause the small high-speed motor to generate large noise and vibration.

[0009] As preferred, the motor planet wheel mounting structure has the first positioning steps coaxially arranged on the outer surface of the planet carrier at the front and rear ends of the planet wheel, the second positioning steps coaxially arranged on the inner wall of the outer rotor at the front and rear ends of the planet wheel, and the adjacent first and second positioning steps located at the opposite corners of the limiting bearing or the positioning bearing.

[0010] The adjacent first and second positioning steps can be clamped at the opposite corners of the limiting bearing or the positioning bearing, thereby further limiting the limiting bearing or the positioning bearing and improving the stability of the limiting bearing or the positioning bearing in use.

[0011] As preferred, the motor planet wheel mounting structure has the planet wheel including a connecting shaft, a large gear and a small gear, the large gear and the small gear being arranged on the connecting shaft at intervals, and the planet carrier including a front carrier body and a rear carrier body, the rear carrier body being provided with a movable cavity, the end of the sun gear and the inner side of the large gear being inserted into the movable cavity, the inner side of the large gear being engaged with the sun gear, and the outer side of the small gear being engaged with the inner side of the wall gear.

[0012] The sun gear is engaged with the large gear, and the small gear is engaged with the wall gear, thereby reducing the impact and vibration between the planet wheel, the sun gear and the wall gear and further reducing the noise in operation.

[0013] As preferred, the motor planet wheel mounting structure has the rear carrier body being circumferentially provided with a plurality of arc-shaped bosses, the large gear being located between adjacent arc-shaped bosses, and the inner side of the wall gear being attached to the outer side of the arc-shaped boss.

[0014] The arc-shaped boss supports the inner side of the wall gear, thereby further improving the stability of the wall gear and the outer rotor.

[0015] As preferred, the motor planet wheel mounting structure has the outer side of the arc-shaped boss being flush with the outer surface of the first positioning step, and the two ends of the arc-shaped boss being attached to the inner wall of the adjacent first positioning step.

[0016] The arc-shaped boss supports the first positioning step, thereby improving the locking effect of the first positioning step on the positioning bearing and the limiting bearing. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1It is a sectional view of the utility model;

[0018] Figure 2 It is a sectional view of the utility model;

[0019] Figure 3 It is an explosive structure schematic view of the utility model;

[0020] Figure 4 It is a structure schematic view of the utility planet carrier, planet wheel of the utility model;

[0021] Figure 5 It is an explosive structure schematic view of the utility planet carrier, planet wheel, sun wheel of the utility model.

[0022] Mark explanation: outer rotor 1;Second positioning step 11;Sun gear 2;Planet carrier 3;First positioning step 31;Front frame body 32;Rear frame body 33;Movable cavity 331;Planet wheel 4;Connecting shaft 41;Big gear 42;Pinion 43;Positioning bearing 5;Wall wheel 6;Limiting bearing 7;Arc-shaped boss 8. Specific implementation

[0023] The utility model will be further described in detail below in combination with the Figures 1-5 And specific implementation, but they are not the limitation of the utility model: Embodiment

[0024] As Figures 1-5 Indicated, a motor planet wheel installation structure, including outer rotor 1, sun gear 2, planet carrier 3 and several planet wheels 4, the sun gear 2, planet carrier 3 and several planet wheels 4 are located in the inside of outer rotor 1, the planet wheel 4 is worn in planet carrier 3, the inside of planet wheel 4 is engaged with sun gear 2, still include coaxial positioning bearing 5 and wall wheel 6 of setting, the wall wheel 6 is engaged with the interference fit of outer rotor 1, the inside of wall wheel 6 is engaged with the outside of several planet wheel 4, positioning bearing 5 is coaxially arranged in the outside of planet carrier 3, the inside, the outside of positioning bearing 5 is respectively attached with the outer wall of planet carrier 3, the inner wall of wall wheel 6.

[0025] As preferred, still include limiting bearing 7, positioning bearing 5, limiting bearing 7 are respectively set in the rear end and the front end of planet carrier 3, the inside, the outside of limiting bearing 7 is respectively attached with the inner wall of outer rotor 1, the outer wall of planet carrier 3.

[0026] Preferably, the outer surface of the planetary carrier 3 is coaxially provided with a first positioning step 31 located at the front and rear ends of the planetary gear 4, and the inner wall of the outer rotor 1 is coaxially provided with a second positioning step 11 located at the front and rear ends of the planetary gear 4. The adjacent first positioning step 31 and second positioning step 11 are located at the diagonal of the limiting bearing 7 or the positioning bearing 5, and the adjacent first positioning step 31 and second positioning step 11 respectively limit the horizontal direction of the limiting bearing 7 and the positioning bearing 5.

[0027] Preferably, the planetary gear 4 includes a connecting shaft 41, a large gear 42, and a small gear 43. The large gear 42 and the small gear 43 are spaced apart on the connecting shaft 41. The planetary carrier 3 includes a front carrier body 32 and a rear carrier body 33. The rear carrier body 33 has a movable cavity 331. The end of the sun gear 2 and the inner side of the large gear 42 are inserted into the movable cavity 331. The inner side of the large gear 42 meshes with the sun gear 2, and the outer side of the small gear 43 meshes with the inner side of the wall gear 6.

[0028] Preferably, the rear frame 33 is provided with a plurality of arc-shaped protrusions 8 in the circumferential direction, the large gear 42 is located between adjacent arc-shaped protrusions 8, and the inner side of the wall wheel 6 is in contact with the outer side of the arc-shaped protrusions 8.

[0029] Preferably, the outer side of the arc-shaped boss 8 is flush with the outer surface of the first positioning step 31, and the two ends of the arc-shaped boss 8 abut against the inner wall of the adjacent first positioning step 31.

[0030] Specifically, such as Figures 3-5 As shown in the embodiment of this application, there are three planetary gears 4 and arc-shaped protrusions 8. The planetary gears 4 and arc-shaped protrusions 8 are arranged at intervals and surround each other to form a ring fixed on the rear frame 33. The movable cavity 331 is located at the center of the rear frame 33 and the front end of the sun gear 2 is inserted into the movable cavity 331. The sun gear 2 meshes with the large gear 42.

[0031] The wall wheel 6 is coaxially arranged inside the outer rotor 1 and the wall wheel 6 is interference-fitted with the inner wall of the outer rotor 1. An L-shaped groove is formed on the inner side of the wall wheel 6. The outer side of the positioning bearing 5 is inserted into the L-shaped groove and abuts against the inner wall of the L-shaped groove, thereby further limiting the positioning bearing 5.

[0032] The positioning bearing 5 and limit bearing 7 on the planetary carrier 3 are externally mounted, which provides sufficient space for the internal motor shaft and sun gear 2. At the same time, the size of the planetary carrier 3 is further reduced, resulting in a significant reduction in the outer diameter and weight of the motor. The planetary gear 4 is precisely positioned through the cooperation of the sun gear 2, positioning bearing 5, wall wheel 6 and limit bearing 7, ensuring that the form and position tolerances of the planetary carrier 3 and planetary gear 4 are at a high level of precision, thus ensuring the stability and reliability of the motor output.

[0033] In summary, the above is only the preferred embodiment of the present application, any changes and modifications made in accordance with the scope of the application for the patent, should be the scope of the present application.

Claims

1. A planetary wheel mounting structure of an electric motor, comprising an outer rotor (1), a sun gear (2), a planetary carrier (3) and a plurality of planetary gears (4), the sun gear (2), the planetary carrier (3) and the plurality of planetary gears (4) being located inside the outer rotor (1), the planetary gears (4) being provided on the planetary carrier (3), the inner side of the planetary gears (4) being engaged with the sun gear (2), characterized in that: The positioning bearing (5) and the wall wheel (6) are coaxially arranged in the outer rotor (1), the wall wheel (6) is in interference fit with the outer rotor (1), the inner side of the wall wheel (6) is engaged with the outer side of the plurality of planetary gears (4), the positioning bearing (5) is coaxially arranged outside the planet carrier (3), and the inner side and the outer side of the positioning bearing (5) are respectively attached to the outer wall of the planet carrier (3) and the inner wall of the wall wheel (6). ​ 2. An electric motor planetary wheel mounting structure according to claim 1, characterized by: The limiting bearing (7) is arranged at the rear end and the front end of the planet carrier (3) respectively, and the inner side and the outer side of the limiting bearing (7) are respectively attached to the inner wall of the outer rotor (1) and the outer wall of the planet carrier (3).

3. An electric motor planetary wheel mounting structure according to claim 2, characterized by: The outer surface of the planet carrier (3) is coaxially provided with the first positioning step (31) located at the front and rear ends of the planetary gear (4), the inner wall of the outer rotor (1) is coaxially provided with the second positioning step (11) located at the front and rear ends of the planetary gear (4), and adjacent first positioning steps (31) and second positioning steps (11) are located at opposite angles of the limiting bearing (7) or the positioning bearing (5), and adjacent first positioning steps (31) and second positioning steps (11) limit the horizontal direction of the limiting bearing (7) and the positioning bearing (5) respectively.

4. An electric motor planetary wheel mounting structure according to claim 3, characterized by: The planet carrier (3) comprises a front carrier body (32) and a rear carrier body (33), the rear carrier body (33) is provided with a movable cavity (331), the end of the sun gear (2) and the inner side of the large gear (42) are inserted into the movable cavity (331), the inner side of the large gear (42) is engaged with the sun gear (2), and the outer side of the small gear (43) is engaged with the inner side of the wall wheel (6).

5. A motor planetary wheel mounting structure according to claim 4, characterized by: The rear carrier body (33) is circumferentially provided with a plurality of arc-shaped bosses (8), the large gear (42) is located between adjacent arc-shaped bosses (8), and the inner side of the wall wheel (6) is attached to the outer side of the arc-shaped boss (8).

6. A motor planetary wheel mounting structure according to claim 5, characterized by: The outer side of the arc-shaped boss (8) is flush with the outer surface of the first positioning step (31), and the two ends of the arc-shaped boss (8) are attached to the inner walls of adjacent first positioning steps (31).

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