CN218243243U - Light efficient through shaft type hub motor - Google Patents

Abstract

The utility model discloses a light efficient through shaft type wheel hub motor, including the through shaft, install the wheel hub casing on the through shaft and locate it along the core, planet reduction gears and the clutch that the through shaft assembled in proper order, the clutch includes outer lane and inner circle, the inner circle is fixed on the through shaft, the planet reduction gears include sun gear and a plurality of planetary gear located on the core output end, planetary gear locates on the planet axle, the planet axle is fixed to the clutch outer lane; the sun gear is in transmission connection with a gear ring fixed on the inner side of the hub shell through a planet gear; the planetary gear is a duplicate gear and comprises a large gear and a small gear which are coaxially and separately arranged, the large gear is a plastic gear and is meshed with a sun gear, the small gear is a metal gear and is meshed with a gear ring, and an extending shaft sleeve is integrally arranged at the center of the small gear to fix the large gear. The through shaft type hub motor can ensure higher output power and better internal structure strength on the premise of reducing weight, and the volume is further reduced.

Description

Light high-efficiency through shaft type hub motor

Technical Field

The utility model relates to a light efficient leads to shaft type in-wheel motor.

Background

In the prior art, a hub motor is manufactured and applied to a road electric power-assisted bicycle, and the industry has higher production requirements on the aspects of the overall weight, the volume, the structural strength and the output power of the hub motor.

As is well known, compared with a hub motor with a segmented shaft structure, a through shaft type hub motor has higher structural strength for supporting a core part, does not limit output torque, does not need to correct concentricity between two segments of shafts, has fewer parts, has a relatively simple structure, and is easier to manufacture and assemble. Therefore, a through shaft type hub motor is adopted in the industry at present.

The through shaft type hub motor is structurally characterized in that a main shaft adopts a through shaft, and a machine core (comprising a stator and a rotor), a planetary reduction mechanism and a clutch are sequentially assembled along the through shaft. In the conventional structural design at present, in order to make the structure compact, each planetary gear in the planetary reduction mechanism is often integrated with a clutch, that is, the clutch is fixed on a through shaft to be used as a planetary carrier, and a planetary shaft at the center of the planetary gear is directly fixed on a clutch outer ring. The output end of the movement is fixed with a sun gear sleeved on the through shaft, and the sun gear is in transmission connection with a gear ring fixed on the inner side of the hub shell through a plurality of planet gears in the planet speed reducing mechanism. The planet gears are usually formed as an integrally formed double gear, with a large gear engaging the sun gear and a small gear engaging the ring gear. However, the current through-shaft type hub motor still has the following problems in practical use:

1) In order to further reduce the weight, the planetary gear in the prior art is usually made of a plastic duplicate gear integrally molded by using a whole plastic, such as POM (polyoxymethylene) plastic, PEEK (polyetheretherketone) plastic, and nylon plastic such as PA66 and PA46, but inevitably brings about a problem of structural strength reduction. In order to make up for the defect, the plastic duplicate gear is usually made thicker and larger to enhance the structural strength, however, when the diameter of the large gear in the duplicate gear is increased, the rotating speed ratio of the large gear to the sun gear at the output end of the rotor is reduced, and finally the overall output power of the motor is reduced.

2) The same problem, after the external diameter of the big gear wheel in the planetary gear is increased, the external diameter of the whole hub shell is increased, and finally the whole volume of the hub motor is increased, the material consumption is increased, the weight is increased, and the cost is increased.

3) The axial size of the whole motor is not reduced after the planetary gear and the clutch are integrated, the internal structure is not compact and optimized, and the requirement of the hub motor used as a road electric power-assisted bicycle is met by a large improvement space.

Disclosure of Invention

The utility model discloses the purpose is: the light and efficient through shaft type hub motor is provided, can still ensure to have higher output power and better internal structure strength on the premise of lighter weight, has smaller volume and more compact internal structure, and is more suitable for a road electric power-assisted bicycle.

The technical scheme of the utility model is that: a light and efficient through shaft type hub motor comprises a through shaft, a hub shell, a core, a planetary reduction mechanism and a clutch, wherein two ends of the hub shell are both arranged on the through shaft through shell bearings, the core, the planetary reduction mechanism and the clutch are arranged in the hub shell and are sequentially assembled along the through shaft; the sun gear is in transmission connection with a gear ring fixed on the inner side of the hub shell through a planet gear; the planetary gear is a duplicate gear and comprises a large gear and a small gear which are coaxial but are arranged in a split mode, wherein the large gear is a plastic gear and is meshed with a sun gear, the small gear is a metal gear and is meshed with a gear ring, and an extending shaft sleeve is integrally arranged in the center of the small gear to fix the large gear.

Further, in the utility model discloses in it is equipped with the cavity of stepping down that supplies its pinion embedding to correspond each planetary gear on the outer lane terminal surface of clutch to it is equipped with the opening to correspond respectively to step down the cavity in the periphery of outer lane, so that the pinion periphery tooth portion is outstanding and the ring gear meshing.

Furthermore, the utility model discloses in big gear injection moulding solid in the pinion extend the axle sleeve periphery, perhaps the gear wheel passes through the keyway structure cooperation and inlays the dress in the pinion extend the axle sleeve periphery.

Furthermore, in the utility model, the hub shell is provided with a core end shaft hole and a clutch end shaft hole which are respectively used for extending out of two ends of the through shaft; wherein a clamping mechanism is arranged on a through shaft section extending out of the hub shell through the shaft hole at the end of the clutch; and a shaft shoulder part is formed on the through shaft and used for assembling and supporting a shell bearing positioned in a shaft hole at the end of the movement, and a plurality of outgoing line holes are formed in the shaft shoulder part and used for leading out outgoing cables of the movement to the outside of the hub shell.

Furthermore, the utility model discloses in the core is external rotor internal stator structure, and sun gear overlaps on logical axle and fixed with the rotor.

Furthermore, the rotor comprises a rotor flywheel cover arranged on the periphery of the stator and magnetic steel which is fixed on the inner wall of the rotor flywheel cover and is opposite to the inner stator, the rotor flywheel cover is assembled on the through shaft through a rotor bearing, and the sun gear is fixed with the outer end of the rotor flywheel cover.

Further, in the utility model discloses in the extension axle sleeve of pinion locates the planet epaxially through a plurality of planet bearing assembly, and planet bearing adopts slide bearing. Compared with a deep groove ball bearing, the radial size of the planetary gear can be further reduced by adopting the sliding bearing, so that the rotating speed ratio of the large gear and the sun gear at the output end of the rotor can be increased, the power is improved, and the radial size of the whole hub motor shell is reduced.

Furthermore, the utility model discloses in the ring gear is the plastics ring gear to further lighten weight, and noise when reducing it and the little gear engagement of metal.

Further, in the utility model discloses in the logical axle is hollow bobbin for run through and set up quick detach axle. The quick-release shaft is a known technology and is used for being assembled and fixed on two side frames of the road electric power-assisted bicycle.

Furthermore, in the present invention, the planetary gears are distributed in a central symmetry manner with respect to the sun gear, and the number of the planetary gears is more than 3.

It should be noted that, in the present invention, as the large gear and the plastic gear ring of the plastic gear, any conventional material in the industry, such as POM (polyoxymethylene) plastic, PEEK (polyetheretherketone) plastic, and nylon plastic, such as PA66 and PA46, can be used for the actual production of the plastic gear.

The pinion gear as the metal gear and the conventional sun gear which is not improved in the utility model are made of any existing common materials in the industry, such as alloy steels of 40Cr, 45 Cr, 20CrMnTi and the like, conventional copper alloys (such as brass) and aluminum alloys and the like, and the forming mode can be milling, forging, cold extrusion, drawing, powder metallurgy and the like.

The utility model has the advantages that:

the utility model discloses whole weight is lighter, and the volume is littleer, and inner structure is compacter to higher output and better inner structure intensity have, satisfy the in-wheel motor requirement that highway electric bicycle used, its concrete expression is as follows:

1) The utility model provides a planetary gear is different from the plastics duplicate gear of current integrative manufacturing, it is big, pinion components of a whole that can function independently set up, the gear wheel adopts plastic gear can alleviate the whole weight of planetary gear, and the pinion adopts metal gear and fixes the gear wheel by the extension axle sleeve of integrative setting above that, this kind of structure makes pinion self also can give the certain support intensity of gear wheel when having intensity, make the gear wheel need not to do external diameter and thickness dimension like conventional technique and greatly increase intensity, can further reduce its external diameter size on the contrary, thereby guarantee that it has higher rotation ratio with rotor output sun gear, and then improve the holistic output of motor.

2. Equally, because the utility model discloses a metal pinion can give the sufficient support intensity of gear wheel among the planetary gear structural design, consequently can further reduce the external diameter size and the thickness size of gear wheel, and this is favorable to reducing the radial and axial dimensions of whole wheel hub casing to reduce whole in-wheel motor's volume and weight.

3. And simultaneously, the utility model discloses correspond each planetary gear on the outer lane terminal surface of clutch and be equipped with the cavity of stepping down that supplies its pinion embedding, the pinion is held behind the cavity of stepping down, can further reduce the axial of planetary gear part in wheel hub shell inner chamber and occupy length, and then conveniently reduces the axial length of whole wheel hub shell, reduces its volume, makes inner structure compacter. Meanwhile, the production material is saved, the weight is reduced, and the production cost is reduced.

4. The utility model discloses in we still make the ring gear plastics ring gear, can further lighten in-wheel motor's weight to plastics ring gear and the little gear engagement of metal can the noise reduction, the gear wheel of same plastics also can the noise reduction with the sun gear engagement of conventional rotor output end metal, thereby make the utility model discloses in-wheel motor's whole noise greatly reduced that works.

5. The utility model discloses well epaxial adoption slide bearing of planet supports the pinion and extends the axle sleeve, compares deep groove ball bearing, adopts slide bearing can further reduce planetary gear at radial ascending size, and then does benefit to the increase wherein gear wheel and rotor output sun gear's speed ratio to raise the power, reduce whole in-wheel motor shell's radial dimension simultaneously.

Drawings

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

FIG. 1 is an overall main sectional view of the present invention;

FIG. 2 is a schematic representation of the clutch of FIG. 1 in isolated perspective (with the planet shafts secured thereto);

FIG. 3 is a front view of the clutch;

FIG. 4 is a left side axial view of the through-shaft of FIG. 1.

Wherein: 1. a shaft is connected; 101. a shaft shoulder; 101a, lead wire holes; 2. a housing bearing; 3. a hub shell; 4. a clutch; 401. an outer ring; 401a, yielding cavities; 401b, an opening; 402. an inner ring; 5. a sun gear; 6. a planetary gear; 601. a bull gear; 602. a pinion gear; 602a, an extension shaft sleeve; 7. a planet shaft; 8. a ring gear; 9. a core end shaft hole; 10. a clutch end shaft hole; 11. a base clamping mechanism; 12. leading out a cable; A. a movement; 13. a stator; 14. a rotor; 14a, a rotor flywheel cover; 14b, magnetic steel; 15. a rotor bearing; 16. a planetary bearing; 17. a quick release shaft; 18. a vehicle frame.

Detailed Description

Example (b): the following description will be made with reference to fig. 1 to 4 for a specific embodiment of the light and efficient through-shaft type in-wheel motor provided by the present invention as follows:

the planetary gear transmission mechanism 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 machine core A, a planetary speed reducing mechanism and a clutch 4 which are arranged in the hub shell 3 and sequentially assembled along the through shaft 1 as shown from left to right in figure 1. The hub shell 3 is provided with a movement end shaft hole 9 (left side in fig. 1) and a clutch end shaft hole 10 (right side in fig. 1) which are respectively used for extending out of two ends of the through shaft 1, wherein a conventional clamping mechanism 11 is installed on a section of the through shaft 1 extending out of the hub shell 3 through the clutch end shaft hole 10.

Still as shown in fig. 1, in the utility model discloses in clutch 4 has outer lane 401 and inner circle 402, and inner circle 402 is fixed on leading to axle 1, comprises sun gear 5 and three planetary gear 6 and three planet axle 7 on locating core a output jointly in planetary reduction mechanism's the constitution, and three planetary gear 6 is central symmetry distribution about sun gear 5. In this embodiment, the movement a is an outer rotor 14 and an inner stator 13, and the sun gear 5 is sleeved on the through shaft 1 and fixed with the rotor 14. The planet gears 6 are arranged on respective planet shafts 7, the planet shafts 7 being fixed to the outer ring 401 of the clutch 4, and the sun gear 5 being in driving connection via the planet gears 6 with a ring gear 8 fixed inside the hub shell 3. The deck a has a lead-out cable 12.

The utility model discloses a core improves and lies in: the planetary gear 6 is a duplicate gear and is composed of a large gear 601 and a small gear 602 which are coaxially but separately arranged, wherein the large gear 601 is a plastic gear and is meshed with the sun gear 5, and the small gear 602 is a metal gear, and an extending shaft sleeve 602a is integrally arranged at the center of the small gear to fix the large gear 601. In this embodiment, the large gear 601 is injection molded and press-fixed on the periphery of the extension sleeve 602 a. As shown in fig. 1 to 3, in the present embodiment, an end surface of the outer ring 401 of the clutch 4 is provided with a relief cavity 401a into which the pinion 602 is fitted, corresponding to each planetary gear 6, and an outer periphery of the outer ring 401 is provided with an opening 401b corresponding to each relief cavity 401a, through which the pinion 602 protrudes to mesh with the ring gear 8.

In the present embodiment, the gear ring 8 is a plastic gear ring.

In this embodiment, the plastic used for the plastic gear 601 and the plastic ring gear is nylon plastic PA66 which is commonly used at present, and the plastic used for the actual production is the metal gear 602, and the conventional sun gear 5 which is not improved in the present invention is manufactured by powder metallurgy process using 40Cr alloy steel which is commonly used in the industry.

Referring to fig. 1 and 4, in this embodiment, a shaft shoulder 101 is formed on the through shaft 1 for assembling and supporting the housing bearing 2 (left side in fig. 1) located in the core end shaft hole 9, the shaft shoulder 101 is provided with a plurality of lead-out holes 101a for leading out the lead-out cable 12 of the core a to the outside of the hub housing 3, and in this embodiment, there are 4 lead-out holes 101a in total.

Referring to fig. 1, in this embodiment, the rotor 14 is composed of a rotor flywheel cover 14a disposed on the periphery of the stator 13 and a magnetic steel 14b fixed on the inner wall of the rotor flywheel cover 14a and opposite to the stator 13 on the inner side, the rotor flywheel cover 14a is assembled on the through shaft 1 through two rotor bearings 15, and the sun gear 5 is fixed to the outer end of the rotor flywheel cover 14 a.

Meanwhile, the extension sleeve 602a of the pinion 602 is assembled on the planet shaft 7 through two planet bearings 16, and the planet bearings 16 are sliding bearings. Compared with a deep groove ball bearing, the radial size of the planetary gear 6 can be further reduced by adopting the sliding bearing, so that the rotating speed ratio of the large gear 601 and the sun gear 5 at the output end of the rotor 14 is increased, the power is improved, and the radial size of the whole hub motor shell is reduced.

The through shaft 1 in this embodiment is a hollow cylindrical shaft for penetrating and installing a quick-release shaft 17, and the quick-release shaft 17 is a known technology and is used for being assembled and fixed to two side frames 18 of the electric road power-assisted bicycle, as shown in fig. 1.

The in-wheel motor of this embodiment has the following technical effect:

1) The planetary gear 6 in this embodiment is different from the existing plastic duplicate gear manufactured integrally, the large gear 601 and the small gear 602 are arranged separately, the large gear 601 adopts a plastic gear to reduce the overall weight of the planetary gear 6, the small gear 602 adopts a metal gear and the large gear 601 is fixed by the extension shaft sleeve 602a integrally arranged thereon, the structure enables the small gear 602 to have strength and simultaneously give certain supporting strength to the large gear 601, the large gear 601 does not need to increase the strength by enlarging the outer diameter and the thickness size like the conventional technology, but can further reduce the outer diameter size, thereby ensuring that the large gear has a higher rotation speed ratio with the sun gear 5 at the output end of the rotor 14, and further improving the overall output power of the motor.

2. Also, since the metal pinion 602 in the structural design of the planet gear 6 can give sufficient supporting strength to the large gear 601, the outer diameter size and the thickness size of the large gear 601 can be further reduced, which is beneficial to reducing the radial and axial sizes of the whole hub shell 3, thereby reducing the volume and weight of the whole hub motor.

3. Meanwhile, the end face of the outer ring 401 of the clutch 4 of the present embodiment is provided with the abdicating cavity 401a for the pinion 602 to be embedded into, and after the pinion 602 is accommodated in the abdicating cavity 401a, the axial occupying length of the part of the planet gear 6 in the inner cavity of the hub shell 3 can be further reduced, so that the axial length of the whole hub shell 3 can be conveniently reduced, the volume of the hub shell is reduced, and the internal structure is more compact. Meanwhile, the production material is saved, the weight is reduced, and the production cost is reduced.

4. In this embodiment we also make the ring gear 8 into a plastic ring gear, can further lighten in-wheel motor's weight to the plastic ring gear can the noise reduction with the little gear 602 meshing of metal, and the gear wheel 601 of same plastics also can the noise reduction with the sun gear 5 meshing of the 14 output end metals of conventional rotor, thereby makes the utility model discloses in-wheel motor's whole noise greatly reduced that works.

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 (10)

1. A light and efficient through shaft type hub motor comprises a through shaft (1), a hub shell (3) with two ends installed on the through shaft (1) through shell bearings (2), a machine core (A) arranged in the hub shell (3) and sequentially assembled along the through shaft (1), a planetary speed reducing mechanism and a clutch (4), wherein the clutch (4) comprises an outer ring (401) and an inner ring (402), the inner ring (402) is fixed on the through shaft (1), the planetary speed reducing mechanism comprises a sun gear (5) and a plurality of planetary gears (6) which are arranged on the output end of the machine core (A), the planetary gears (6) are arranged on a planetary shaft (7), and the planetary shaft (7) is fixed to the outer ring (401) of the clutch (4); the sun gear (5) is in transmission connection with a gear ring (8) fixed on the inner side of the hub shell (3) through a planet gear (6); the planetary gear is characterized in that the planetary gear (6) is a duplicate gear and comprises a large gear (601) and a small gear (602) which are coaxially but separately arranged, wherein the large gear (601) is a plastic gear and is meshed with the sun gear (5), the small gear (602) is a metal gear and is meshed with the gear ring (8), and an extension shaft sleeve (602 a) is integrally arranged at the center of the small gear (602) to fix the large gear (601).

2. A lightweight high-efficiency through-shaft type in-wheel motor according to claim 1, wherein the clutch (4) has a relief recess (401 a) on the end face of the outer ring (401) for the pinion (602) to be inserted into, corresponding to each planetary gear (6), and an opening (401 b) on the outer periphery of the outer ring (401) for the outer peripheral teeth of the pinion (602) to project to engage with the ring gear (8), corresponding to each relief recess (401 a).

3. A light-weight high-efficiency through shaft type in-wheel motor according to claim 1 or 2, characterized in that the large gear (601) is injection molded and fixed on the periphery of the extension shaft sleeve (602 a) of the small gear (602), or the large gear (601) is fitted on the periphery of the extension shaft sleeve (602 a) of the small gear (602) through a key slot structure.

4. The light-weight high-efficiency through shaft type hub motor according to claim 1 or 2, characterized in that the hub shell (3) is provided with a movement end shaft hole (9) and a clutch end shaft hole (10) for extending two ends of the through shaft (1) respectively; wherein a clamping mechanism (11) is arranged on the section of the through shaft (1) which extends out of the hub shell (3) through the clutch end shaft hole (10); meanwhile, a shaft shoulder (101) is formed on the through shaft (1) and used for assembling and supporting the shell bearing (2) located in the core end shaft hole (9), and a plurality of leading-out wire holes (101 a) are formed in the shaft shoulder (101) and used for leading out the leading-out wire cable (12) of the core (A) to the outside of the hub shell (3).

5. A light weight high efficiency through shaft type in-wheel motor according to claim 1 or 2, characterized in that the core (a) is an outer rotor (14) and inner stator (13) structure, and the sun gear (5) is sleeved on the through shaft (1) and fixed with the rotor (14).

6. A light and high-efficiency through shaft type in-wheel motor according to claim 5, characterized in that the rotor (14) comprises a rotor flywheel cover (14 a) arranged at the periphery of the stator (13) and magnetic steel (14 b) fixed on the inner wall of the rotor flywheel cover (14 a) and opposite to the inner stator (13), the rotor flywheel cover (14 a) is assembled on the through shaft (1) through a rotor bearing (15), and the sun gear (5) is fixed with the outer end of the rotor flywheel cover (14 a).

7. A lightweight high-efficiency through-shaft type in-wheel motor according to claim 1 or 2, characterized in that the extension shaft sleeve (602 a) of the pinion (602) is mounted on the planet shaft (7) through a plurality of planet bearings (16), and the planet bearings (16) are sliding bearings.

8. A lightweight high-efficiency through-shaft type in-wheel motor according to claim 1 or 2, characterized in that said gear ring (8) is a plastic gear ring.

9. A light-weight high-efficiency through-shaft type in-wheel motor as claimed in claim 1, characterized in that said through-shaft (1) is a hollow cylindrical shaft for passing through a quick-release shaft (17).

10. A lightweight high-efficiency through-shaft type in-wheel motor according to claim 1, characterized in that the planetary gears (6) are distributed in central symmetry with respect to the sun gear (5) and the number is more than 3.

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