CN212033921U

CN212033921U - Through shaft type hub motor

Info

Publication number: CN212033921U
Application number: CN202020883276.XU
Authority: CN
Inventors: 温群峰
Original assignee: Suzhou Shengyi Motor Co ltd
Current assignee: Suzhou Shengyi Motor Co ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-11-27
Anticipated expiration: 2030-05-22

Abstract

The utility model discloses a through shaft type hub motor, which comprises a through shaft, a hub shell arranged on the through shaft, and a motor core, a planetary reduction gear and a clutch which are arranged along the through shaft in sequence; the motor core is of an outer rotor and inner stator structure, the planetary reduction mechanism comprises a sun gear fixed with the rotor and sleeved on the through shaft, a planetary support fixed on the through shaft, and a plurality of planetary gears which are pivotally installed on the planetary support by the planetary shaft and surround the sun gear, each planetary gear is a duplicate gear and comprises a large gear and a small gear which are coaxially and integrally connected, and the large gear is meshed with the sun gear; the hub shell has one end near the clutch fixed with connecting shaft sleeve extending inside, the inner ring of the clutch is fixed to the connecting shaft sleeve via thread connection, the outer ring of the clutch has one extending ring extending axially along the shaft, and the inner ring is formed or fixed with inner ring gear meshed with the small gears of the planetary gears. The utility model discloses the diameter can be done littleer, and the structure is compacter, also changes the assembly.

Description

Through shaft type hub motor

Technical Field

The utility model relates to a lead to shaft type in-wheel motor.

Background

The hub motor is a power core component mainly applied to an electric moped, and the development of the hub motor in the industry at present mainly tends to be miniaturized (compact in structure and small in diameter) and output torque.

It is known that the reduction of the size of the hub motor is achieved by increasing the reduction ratio, which is usually mainly to reduce the number of teeth of the sun gear in the planetary reduction transmission mechanism, and in order to further reduce the number of teeth of the sun gear in the industry, the main shaft of the hub motor is made in two segments, so as to ensure that the diameter of the sun gear in the middle is not limited by the diameter of the main shaft.

However, the two-section type hub motor with the main shaft has the advantages that the defects are obvious, the support strength of the half shafts on the two sides is low, the output torque is limited, in addition, the number of parts is large, the manufacturing cost is high, the concentricity between the half shafts on the two sides and the central machine core shaft needs to be corrected during assembly, the machining precision of the parts is high, the assembly process is complex, and the production efficiency is low.

Therefore, a through-shaft inner rotor hub motor is adopted in the industry at present, and the hub motor is structurally characterized in that a main shaft adopts a through shaft, and a stator, a rotor and a planetary reduction mechanism are assembled on the through shaft. Compared with the original scheme, the structure is simpler, and the assembly and the processing are easier. However, the existing through-shaft inner rotor hub motor still has the following defects in structure:

1) the planetary reduction mechanism and the clutch are often designed to be integrated, for example, a hub motor of the type commonly found on the market usually fixes the planetary shaft to the clutch outer ring, and although the structure is compact, the manufacturing and assembling of the planetary reduction mechanism and the clutch are very tedious, and the production efficiency is greatly reduced.

) And because the planet axle is installed to the clutch, in order to consider the support intensity of clutch, often will make the clutch diameter big, the corresponding wheel hub casing that holds the clutch also increases, this causes and can't make the wheel hub motor diameter further little.

) The planetary reduction mechanism is designed on the clutch, so that the outer diameter of the planetary reduction mechanism is increased, the size of an inner gear ring matched with the planetary gear is increased, the diameter of a hub shell provided with the inner gear ring cannot be further reduced, the internal structure is still not optimized enough, and the size is large.

Disclosure of Invention

The utility model discloses the purpose is: the through shaft type hub motor is smaller in diameter, more compact in structure, easier to assemble and capable of improving assembling efficiency.

The technical scheme of the utility model is that: a through shaft type hub motor comprises a through shaft, a hub shell, a motor core, a planetary reduction mechanism and a clutch, wherein both ends of the hub shell are arranged on the through shaft through shell bearings; the motor core is of an outer rotor inner stator structure and comprises a stator fixed on the through shaft and a rotor assembled on the through shaft by adopting a rotor bearing, the planetary reduction mechanism comprises a sun gear fixed with the rotor and sleeved on the through shaft, a planetary support fixed on the through shaft and a plurality of planetary gears which are pivotally arranged on the planetary support by a planetary shaft and surround the sun gear, each planetary gear is a duplicate gear and comprises a large gear and a small gear which are coaxially and integrally connected, wherein the large gear is meshed with the sun gear; a connecting shaft sleeve extending into the hub shell is fixed at one end of the hub shell close to the clutch, and the inner periphery of the connecting shaft sleeve is assembled on the through shaft through a shell bearing; the clutch comprises an inner ring and an outer ring, the inner ring is fixedly connected with the connecting shaft sleeve through thread matching, an extension ring extending along the axial direction of the through shaft is integrally formed on the outer ring, and an inner gear ring meshed with the pinions of the planetary gears is formed or fixed on the inner periphery of the extension ring.

Further, in the utility model discloses in the connecting axle sleeve periphery is equipped with the external screw thread, and the clutch the interior week of interior week is equipped with the internal thread of being connected with the external screw thread cooperation.

Furthermore, in the utility model, the hub shell is formed by fixing a hub concave shell and a hub end cover, the hub concave shell and the hub end cover are both provided with shaft holes for the through shaft to pass through, and a bearing seat is formed in the shaft hole of the hub concave shell to install a shell bearing; and a circle of snap ring is formed on the inner periphery of the shaft hole of the hub end cover and is clamped into a circle of clamping groove formed on the outer periphery of the connecting shaft sleeve to fix the connecting shaft sleeve, and a bearing seat is formed at the inner end of the connecting shaft sleeve to install a shell bearing.

Further, in the utility model discloses in the planet support passes through the keyway cooperation and fixes to leading to epaxially, leads to epaxial through setting up the draw-in groove inlay and be equipped with a location rand, planet support one end offsets with the location rand, and the other end then offsets with the casing bearing of dress in the connecting axle sleeve. The design makes the internal mechanism of the hub shell more compact in the axial direction, so that the whole volume of the hub motor is reduced.

Furthermore, the stator of the utility model comprises an annular bracket and a stator coil fixed on the annular bracket, while the rotor comprises a rotor flywheel cover and a magnetic steel fixed on the inner wall of the rotor flywheel cover and matched with the stator coil, and the rotor flywheel cover is assembled on the through shaft through the rotor bearing; and a circle of boss matched and fixed with the inner periphery of the annular support through a key groove is milled on the through shaft, and a plane bearing is arranged between the rotor bearing and the boss in an abutting mode. The design is also to make the internal mechanism of the hub shell more compact in the axial direction, and the structure is optimized, so that the whole volume of the hub motor is reduced.

Furthermore, in the present invention, the planetary gear is a nylon gear, and the sun gear is a powder metallurgy gear.

Furthermore, in the present invention, the planetary gears are distributed in a central symmetry manner with respect to the sun gear.

More preferably, in the present invention, the number of the planetary gears is 3.

The utility model has the advantages that:

1) the utility model discloses an among the institutional advancement, adopt the motor core of stator structure in the external rotor, with planetary reduction mechanism's sun gear connection to the rotor, independently separately design clutch with planet support simultaneously, design the ring gear on the outer lane of clutch, and with the inner circle with set up the connecting axle sleeve screw-thread fit connection on the wheel hub casing specially, this can guarantee the utility model discloses motor overall structure's compactness, very big doing benefit to the part assembly again, can improve assembly efficiency.

) The utility model provides a clutch compares prior art and adopts independent design, and the design is followed the axial extension's that leads to the axle extension ring on its outer lane, sets up the planetary gear meshing in ring gear and the planetary reduction mechanism again on extending the ring, and the external diameter of planetary reduction mechanism, clutch and ring gear can both obtain reducing like this, and because the ring gear no longer is relevant with the wheel hub casing, so the external diameter of wheel hub casing itself also can corresponding reduction to make the holistic diameter of wheel hub motor can further do for a short time.

) The utility model provides a clutch inner circle adopts screw-thread fit to be connected to on special connecting axle sleeve, and not only simple to operate has ensured in addition that the clutch has enough support intensity, and we need not like this like prior art to do clutch diameter greatly, and the corresponding wheel hub casing volume that holds the clutch also can reduce, and then reduces the holistic volume of in-wheel motor.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic structural diagram of the present invention.

Wherein: 1. passing through the shaft; 1a, a boss; 2. a housing bearing; 3. a hub shell; 3a, a hub concave shell; 3b, a hub end cover; A. a motor core; 4. a rotor; 4a, a rotor flywheel cover; 4b, magnetic steel; 5. a stator; 5a, a ring-shaped bracket; 5b, a stator coil; 6. a rotor bearing; B. a planetary reduction mechanism; 7. a sun gear; 8. a planet carrier; 9. a planet shaft; 10. a planetary gear; 10a, a gearwheel; 10b, a pinion; 11. connecting the shaft sleeve; C. a clutch; 12. an inner ring; 13. an outer ring; 13a, an extension ring; 14. an inner gear ring; 15. a snap ring; 16. a card slot; 17. a positioning collar; 18. and a plane bearing.

Detailed Description

Example (b): the following describes a specific embodiment of the through-shaft type in-wheel motor provided by the present invention with reference to fig. 1 as follows:

the planetary gear reducer is provided with a through shaft 1, a hub shell 3 with two ends mounted on the through shaft 1 through shell bearings 2, and a motor core A, a planetary reduction mechanism B and a clutch C which are arranged in the hub shell 3 as in the prior art. The utility model discloses an improve characteristics and lie in: the motor core A, the planetary reduction mechanism B and the clutch C in the hub shell 3 are sequentially arranged along the axial direction of the through shaft 1 from left to right. The motor core A is an outer rotor 4 and inner stator 5 structure, and is composed of a stator 5 fixed on the through shaft 1 and a rotor 4 assembled on the through shaft 1 by a rotor bearing 6. The planetary reduction mechanism B is composed of a sun gear 7 which is fixed with the rotor 4 and sleeved on the through shaft 1, a planet carrier 8 fixed on the through shaft 1, and three planet gears 10 which are pivotally arranged on the planet carrier 8 through a planet shaft 9 and are distributed around the sun gear 7 in a centrosymmetric mode. Each planetary gear 10 is a duplicate gear and is composed of a large gear 10a and a small gear 10b which are coaxially and integrally connected, wherein the large gear 10a is meshed with the sun gear 7; a connecting sleeve 11 extending into the hub housing 3 is fixed to an end of the hub housing 3 adjacent to the clutch C, and the inner circumference of the connecting sleeve 11 is fitted to the through shaft 1 via a housing bearing 2. The clutch C has an inner race 12 and an outer race 13, the inner race 12 is fixed to the coupling sleeve 11 by screw-fitting, and the outer race 13 is integrally formed with an extension ring 13a extending in the axial direction of the through-shaft 1, and an inner ring gear 14 engaged with the pinion 10b of each planetary gear 10 is formed on the inner periphery of the extension ring 13 a.

Specifically, referring to fig. 1, in this embodiment, an outer circumference of the connecting sleeve 11 is provided with an external thread, and an inner circumference of the inner ring 12 of the clutch C is provided with an internal thread which is connected with the external thread in a matching manner.

In the embodiment, the hub shell 3 is formed by fixing a hub concave shell 3a and a hub end cover 3b through screws, shaft holes for the through shaft 1 to pass through are formed in the hub concave shell 3a and the hub end cover 3b, and a bearing seat is formed in the shaft hole of the hub concave shell 3a to install the shell bearing 2; and a circle of snap rings 15 are formed on the inner periphery of the shaft hole of the hub end cover 3b and are clamped into a circle of clamping grooves 16 formed on the outer periphery of the connecting shaft sleeve 11 to fix the connecting shaft sleeve 11, and a bearing seat is formed at the inner end of the connecting shaft sleeve 11 to install the shell bearing 2.

In this embodiment, the planet carrier 8 is fixed to the through shaft 1 by a key slot, a positioning collar 17 is embedded in the through shaft 1 by a clamping slot, one end of the planet carrier 8 abuts against the positioning collar 16, and the other end abuts against the housing bearing 2 installed in the connecting shaft sleeve 11.

The stator 5 in this embodiment is specifically composed of an annular support 5a and a stator coil 5b fixed on the annular support 5a, the rotor 4 is composed of a rotor flywheel cover 4a and a magnetic steel 4b fixed on the inner wall of the rotor flywheel cover 4a and matched with the stator coil 5b, the rotor flywheel cover 4a is assembled on the through shaft 1 through the rotor bearing 6, the aforementioned sun gear 7 is formed with a connecting ring portion, and the connecting ring portion is connected with the inner periphery of the rotor flywheel cover 4a through a spline and then pressed and fixed. Specifically, as shown in fig. 1, a circle of bosses 1a that are fixed to the inner circumference of the annular bracket 5a through a keyway are milled on the through shaft 1, and a plane bearing 18 is abutted between the rotor bearing 6 and the bosses 1 a.

In this embodiment, the planetary gear 10 is a nylon gear, and the sun gear 7 is a powder metallurgy gear.

The utility model discloses an among the institutional advancement, adopt motor core A of 5 structures of external rotor 4 internal stators, be connected to rotor 4 with planetary reduction mechanism B's sun gear 7 on, with clutch C with the independent separately design of planet support 8 simultaneously, on designing clutch C's outer lane 13 with ring gear 14, and be connected inner circle 12 and the connecting axle sleeve 11 screw-thread fit that sets up on wheel hub casing 3 specially, this can guarantee the utility model discloses motor overall structure's compactness, very big doing benefit to the part assembly again, can improve assembly efficiency.

Simultaneously the utility model provides a clutch C compares prior art and adopts independent design, design along the axial extension's of logical axle 1 extension ring 13a on its outer lane 13, set up the meshing of planetary gear 10 in ring gear 14 and the planetary reduction gear on extending ring 13a again, planetary reduction gear B like this, clutch C and ring gear 14's external diameter can both be reduced, and because ring gear 14 no longer is relevant with wheel hub casing 3, so the external diameter of wheel hub casing 3 itself also can correspondingly reduce, thereby make the holistic diameter of in-wheel motor can further do for a short time.

Furthermore, because the utility model provides a clutch C inner circle 12 adopts screw-thread fit to be connected to special connecting axle sleeve 11 on, not only simple to operate has ensured moreover that clutch C has enough support intensity, and we need not like this prior art to do clutch C diameter greatly, and the corresponding 3 volumes of hub shell that hold clutch C also can reduce, and then reduces the holistic volume of in-wheel motor.

The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All modifications made according to the spirit of the main technical scheme of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A through shaft type hub motor comprises a through shaft (1), a hub shell (3) with two ends mounted on the through shaft (1) through shell bearings (2), a motor core (A) arranged in the hub shell (3), a planetary reduction mechanism (B) and a clutch (C); it is characterized in that the motor core (A), the planetary reduction mechanism (B) and the clutch (C) are sequentially arranged along the axial direction of the through shaft (1), wherein the motor core (A) is of an outer rotor (4) and inner stator (5) structure and comprises a stator (5) fixed on the through shaft (1) and a rotor (4) assembled on the through shaft (1) by adopting a rotor bearing (6), the planetary reduction mechanism (B) comprises a sun gear (7) fixed with the rotor (4) and sleeved on the through shaft (1), a planetary support (8) fixed on the through shaft (1), and a plurality of planetary gears (10) which are pivotally mounted on the planetary support (8) through planetary shafts (9) and surround the sun gear (7), each planetary gear (10) is a duplicate gear and comprises a large gear (10 a) and a small gear (10B) which are coaxially and integrally connected, wherein the large gear (10 a) is meshed with the sun gear (7); a connecting shaft sleeve (11) extending into the hub shell (3) is fixed at one end close to the clutch (C), and the inner periphery of the connecting shaft sleeve (11) is assembled on the through shaft (1) through a shell bearing (2); the clutch (C) comprises an inner ring (12) and an outer ring (13), the inner ring (12) is fixedly connected with the connecting shaft sleeve (11) through thread matching, an extension ring (13 a) extending along the axial direction of the through shaft (1) is integrally formed on the outer ring (13), and an inner gear ring (14) meshed with the pinions (10 b) of the planetary gears (10) is formed or fixed on the inner periphery of the extension ring (13 a).

2. The through-shaft type in-wheel motor according to claim 1, characterized in that the connecting shaft sleeve (11) is provided with external threads on the outer circumference, and the inner ring (12) of the clutch (C) is provided with internal threads on the inner circumference for matching connection with the external threads.

3. The through shaft type hub motor according to claim 2, wherein the hub shell (3) is fixedly formed by a hub concave shell (3 a) and a hub end cover (3 b), the hub concave shell (3 a) and the hub end cover (3 b) are respectively provided with a shaft hole for the through shaft (1) to pass through, and a bearing seat is formed in the shaft hole of the hub concave shell (3 a) to install the shell bearing (2); and the inner periphery of the shaft hole of the hub end cover (3 b) is provided with a circle of snap ring (15) which is clamped into a circle of clamping groove (16) arranged on the outer periphery of the connecting shaft sleeve (11) to fix the connecting shaft sleeve (11), and the inner end of the connecting shaft sleeve (11) is also provided with a bearing seat to install the shell bearing (2).

4. The through shaft type in-wheel motor according to claim 1, 2 or 3 is characterized in that the planet carrier (8) is fixed on the through shaft (1) through a key slot fit, a positioning collar (17) is embedded on the through shaft (1) through a clamping slot, one end of the planet carrier (8) is abutted against the positioning collar (17), and the other end of the planet carrier is abutted against the shell bearing (2) arranged in the connecting shaft sleeve (11).

5. The through-shaft type in-wheel motor according to claim 1, 2 or 3, characterized in that the stator (5) comprises an annular bracket (5 a) and a stator coil (5 b) fixed on the annular bracket (5 a), and the rotor (4) comprises a rotor flywheel cover (4 a) and a magnetic steel (4 b) fixed on the inner wall of the rotor flywheel cover (4 a) and matched with the stator coil (5 b), wherein the rotor flywheel cover (4 a) is assembled on the through-shaft (1) through the rotor bearing (6); and a circle of boss (1 a) matched and fixed with the inner periphery of the annular support (5 a) through a key groove is milled on the through shaft (1), and a plane bearing (18) is arranged between the rotor bearing (6) and the boss (1 a) in an abutting mode.

6. The through-shaft in-wheel motor according to claim 1, characterized in that the planetary gear (10) is a nylon gear and the sun gear (7) is a powder metallurgy gear.

7. A through-shaft in-wheel motor according to claim 1, characterised in that the planetary gears (10) are arranged centrosymmetrically with respect to the sun gear (7).

8. The through-shaft in-wheel motor according to claim 7, characterized in that the number of planetary gears (10) is 3.