CN111509908A - A pin type cycloidal hub motor - Google Patents

Abstract

The invention relates to a pin shaft type cycloidal hub motor, which belongs to the technical field of electric bicycles and comprises a motor assembly and a cycloidal reducer assembly, wherein the cycloidal reducer assembly comprises a rotating arm, a cycloidal planetary gear sleeved on the rotating arm and a pin wheel matched with the cycloidal planetary gear; end plates for supporting the rotating arm are arranged on two sides of the cycloid planet gear, the cycloid planet gear is connected with the end plates through pin shafts, and the pin shafts are used for limiting the rotation of the cycloid planet gear; the pin gear shell of the pin wheel is arranged on the inner side of the hub and is fixedly connected to the hub or integrally designed with the hub; the motor assembly is positioned on one side of the end disc, which is far away from the cycloid planet wheel, and comprises a motor rotor fixed on the rotating arm and a motor stator arranged on the circumferential direction of the motor rotor. Compared with the prior art, the invention has the advantages of larger overload capacity, higher impact resistance, simple and compact structure and smaller volume by adopting the output of the pin gear shell.

Description

A pin type cycloidal hub motor

technical field

The invention belongs to the technical field of electric bicycles, and relates to a pin-shaft type cycloidal wheel hub motor.

Background technique

In recent years, electric bicycles have been gradually accepted by consumers as an environmentally friendly and energy-saving means of transportation. Whether at home or abroad, the sales of electric bicycles around the world are also increasing year by year, and the trend of electric bicycles replacing bicycles is gradually expanding. , and the hub motor of an electric bicycle is the core component of an electric bicycle, and its quality determines the overall quality of the electric bicycle.

The electric bicycle safety technical specification (GB17761-2018) points out that the maximum speed of electric bicycles is limited to ≤25km/h, which requires the hub motor to provide a larger reduction ratio, while the existing hub motor has a complex structure, large volume and short service life.

Chinese patent CN105667296A discloses an electric wheel hub motor, the output components of which include an output shaft, an outer pin fixing piece, a wheel hub connecting piece, and a wheel hub. The structure is complicated, the size of the whole machine is increased, and the rigidity is reduced. In addition, the use of ball bearings at the central station is easy to damage, which shortens the service life of the in-wheel motor.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present application is to provide a pin-type cycloidal hub motor, which has a large overload capacity and a high impact resistance performance, and has a simple and compact structure and a smaller volume.

To achieve the above object, the present invention provides the following technical solutions:

A pin-shaft type cycloidal hub motor includes a motor assembly and a cycloidal reducer assembly, wherein the cycloidal reducer assembly includes a rotating arm, a cycloidal planetary gear sleeved on it, and a cycloidal planetary gear matched with the cycloidal planetary gear. pin wheel; both sides of the cycloidal planetary gear are provided with end discs for supporting the rotating arm, the cycloidal planetary gear and the end disc are connected by a pin shaft, and the pin shaft is used to limit the The rotation of the cycloidal planetary wheel; the pin gear housing of the pin wheel is arranged on the inner side of the hub, and the pin gear housing of the pin wheel is fixed on the wheel hub or is designed integrally with the wheel hub; The motor rotor on the motor rotor and the motor stator arranged in the circumferential direction of the motor rotor.

Optionally, the motor assembly is located on the side of the end disc away from the cycloidal planetary gear.

Optionally, a motor housing located outside the motor stator is fixedly connected to the end disc, and is open toward one end of the end disc.

Optionally, a rotating arm bearing is provided between the cycloid planetary gear and the rotating arm, and the rotating arm bearing is a full complement cylindrical roller bearing.

Optionally, a first bearing is provided between the hub and the end disc, the first bearing is sleeved on the end disc, and the first bearing is a deep groove ball bearing.

Optionally, both sides of the cycloidal planetary gear are provided with first sleeves for restricting the axial movement thereof, and the first sleeves are sleeved on the rotating arm.

Optionally, a central bearing is arranged between the rotating arm and the end disc, and a second sleeve is arranged between the central bearing on the side close to the motor rotor and the motor rotor, and the second sleeve sleeved on the rotating arm.

The beneficial effects of the present invention are:

1. The pin-type cycloidal hub motor disclosed in the present invention reduces the shear force and bending moment of the rotating arm, improves the force of the rotating arm, and increases the service life of the motor by adopting the pin gear shell output.

2. The pin-type cycloidal hub motor disclosed in the present invention has an integral structure of the pin gear housing and the hub, which not only simplifies the structure of the hub motor, but also has high rigidity and can output greater power and rotational speed.

3. A pin-type cycloidal hub motor disclosed in the present invention, by arranging the motor rotor on the outer side of the end disc, the side of the motor housing facing the end disc is designed to be open and fixed on the end disc , which further simplifies the structure of the in-wheel motor and makes the structure more compact.

4. In the pin-type cycloidal hub motor disclosed in the present invention, the full-complement cylindrical roller bearing is used as the rotating arm bearing, which can bear a larger load, is not easy to be damaged, and prolongs the service life of the hub motor.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be preferably described in detail below with reference to the accompanying drawings, wherein:

1 is a schematic structural diagram of a pin-type cycloidal hub motor of the present invention;

Figure 2 is a schematic diagram of the static load distribution of the axial section of the output component;

Fig. 3 is the shear force diagram of the output member under the load distribution condition shown in Fig. 2;

FIG. 4 is a bending moment diagram of the output member under the load distribution conditions shown in FIG. 2 .

Reference signs: wheel hub 1, first bearing 2, left end plate of cycloid reducer 3, pin bolt 4, pin 5, cycloid planetary wheel 6, central bearing 7, rotating arm 8, seal 9, motor bolt 10 , motor housing 11, right end plate 12 of cycloid reducer, first sleeve 13, key 14, shaft retaining ring 15, second sleeve 16, retaining ring for hole 17, motor rotor 18, motor stator 19. Swivel arm bearing 20, pin-tooth pin 21.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

Among them, the accompanying drawings are only used for exemplary description, and represent only schematic diagrams, not physical drawings, and should not be construed as limitations of the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, The enlargement or reduction does not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms “upper”, “lower”, “left” and “right” , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation of the present invention. situation to understand the specific meaning of the above terms.

Please refer to FIGS. 1 to 4 , a pin-type cycloidal hub motor includes a motor assembly and a cycloidal reducer assembly. The cycloidal reducer assembly includes a rotating arm 8 and a cycloidal planetary gear 6 sleeved on it. And the pin wheel matched with the cycloidal planetary wheel 6; the cycloidal planetary wheel 6 and the rotating arm 8 are provided with a rotating arm bearing 20; The planetary gear 6 is connected to the end discs on both sides through the pin shaft 5; the pin shaft 5 is fixedly connected to the end discs on both sides of the linear planetary gear 6 to limit the rotation of the cycloidal planetary gear 6, and the cycloidal planetary gear 6 is on the pin shaft. Swing around the rotating arm 8 under the constraint of 5; the pin gear shell of the pin wheel is arranged on the inner side of the hub 1, and the pin tooth shell of the pin wheel is fixed on the wheel hub 1 or designed as an integral part with the wheel hub 1; There is a first bearing 2 , and the first bearing 2 is sleeved on the end plate; the motor assembly includes a motor rotor 18 fixed on the rotating arm 8 and a motor stator 19 arranged in the circumferential direction of the motor rotor 18 .

In order to make the structure more compact, the motor assembly of the present invention is located outside the end plate, and the motor housing 11 located outside the motor stator 19 is fixedly connected to the end plate and is open toward one end of the end plate.

In order to reduce the impact on the in-wheel motor due to the damage of the bearing and improve the service life of the in-wheel motor, the present invention designs the swivel arm bearing 20 which is subjected to greater force as a full complement cylindrical roller bearing.

Preferably, both sides of the cycloidal planetary gear 6 are provided with first sleeves 13 for restricting its axial movement, and the first sleeve 13 is sleeved on the rotating arm 8; a central bearing is provided between the rotating arm 8 and the end disc 7. A second sleeve 16 is provided between the central bearing 7 on the side close to the motor rotor 18 and the motor rotor 18 , and the second sleeve 16 is sleeved on the rotating arm 8 .

The present invention provides a cycloidal hub motor with simple structure, high rigidity and long service life. The motor stator 19 is fixed, and the motor rotor 18 is connected with the rotating arm 8 through the key 14. After the power is turned on, the motor rotor 18 drives the rotating arm 8 to rotate. The arm 8 is connected with the cycloid planetary wheel 6 through the rotating arm bearing 20, and the eccentric swing of the cycloid wheel makes the hub 1 rotate directly.

Example

A pin-type cycloidal hub motor, including a motor assembly and a cycloidal reducer assembly, the motor assembly is connected to the end disc located on one side of the cycloidal planetary wheel 6 through the motor housing 11, and the motor rotor 18 and the rotating arm 8 pass through. The key 14 is connected, and the hub 1 and the pin gear housing of the pin wheel are integrally designed.

Specifically, the cycloid reducer assembly includes a rotating arm 8, an end disc, a pin wheel, a first bearing 2, a pin bolt 4, a pin 5, a cycloid planetary gear 6, a central bearing 7, a seal 9, a first set of Cylinder 13, key 14, retaining ring for shaft 15, first sleeve 13, retaining ring 17 for hole, arm bearing 20 and pin-tooth pin 21, the end plate includes the left end plate 3 of the cycloid reducer and the cycloid reducer The right end plate 12 of the device.

The cycloidal planetary gear 6 includes two planetary gears, and the cycloidal planetary gear 6 is sleeved on the rotating arm 8; a rotating arm bearing is provided between the cycloidal planetary gear 6 and the rotating arm 8, and the rotating arm bearing 20 is a full complement of cylindrical rollers. Sub bearings; the left end plate 3 of the cycloid reducer and the right end plate 12 of the cycloid reducer are respectively arranged on the left and right sides of the cycloid planetary wheel 6, and a central bearing 7 is arranged between the two end plates and the rotating arm 8; the cycloid planetary wheel A first sleeve 13 for limiting the axial position of the cycloidal planetary wheel 6 is provided between the 6 and the end discs on both sides thereof, and the first sleeve 13 is sleeved on the rotating arm 8 .

The pin wheel is matched with the cycloid planetary wheel 6, the pin wheel includes a pin gear housing and a pin gear pin 21 arranged on the pin gear housing, the pin gear housing of the pin wheel is integrated on the hub 1, and a pin gear is provided between the hub 1 and the end disc. The first bearing 2 is sleeved on the end plate, and the first bearing 2 is a deep groove ball bearing.

The cycloidal planetary gear 6 is connected with the two end discs through the pin shaft 5. The specific connection method is that one end of the pin shaft 5 is fixed on the end disc on the side close to the motor assembly, and the other end passes through the cycloidal planetary gear 6 through the pin shaft bolt 4. It is threadedly connected to the other end disk; the cycloidal planetary wheel 6 swings around the rotating arm 8 under the constraint of the pin shaft 5 , and then drives the hub 1 to rotate around the rotating arm 8 .

The motor assembly includes a motor bolt 10, a motor housing 11, a motor rotor 18 and a motor stator 19. The motor stator 19 is fixed on the motor housing 11. The motor assembly is located on the side of the end disc away from the cycloidal planetary gear 6. The motor rotor 18 is connected with the rotating arm 8 through a key 14; the motor housing 11 is open to one end of the end plate, and is threadedly connected to the end plate through a motor bolt 10.

A second sleeve 16 for limiting the axial position of the center bearing 7 is arranged between the central bearing 7 on the side close to the motor rotor 18 and the motor rotor 18, and the second sleeve 16 is sleeved on the rotating arm 8; The outer ring of the central bearing 7 on the side is limited by the elastic retaining ring 17 through the hole in the end plate; the axial retaining ring 15 is provided between the motor rotor 18 and the motor housing 11, and the shaft uses elastic retaining ring 15. The retaining ring 15 is sleeved on the rotating arm 8; the first bearing 2 on the side close to the motor rotor 18 is provided with a sealing member 9, and the sealing member 9 is located between the hub 1 and the end disc.

The pin gear housing of the in-wheel motor is the output end, the left end plate 3 of the cycloid reducer and the right end plate 12 of the cycloid reducer are fixed on the vehicle, the motor assembly is a power assembly, and the motor assembly drives the cycloid planetary gear through the rotation of the rotating arm 8 6 rotates, the cycloid planetary wheel 6 swings eccentrically under the constraint of the pin shaft 5, and the hub 1 rotates around the rotating arm 8 through the pin gear housing arranged on the hub 1.

The rotating arm 8 of the in-wheel motor is supported by two central bearings 7, and the cycloidal planetary gear 6 is located between the two central bearings 7. Accordingly, the load on the wheel hub 1, which is designed integrally with the pin gear shell as the output component, is distributed on the wheel hub. In the middle of 1, the shear force and bending moment of the output part are smaller, the stress condition is better, the bearing capacity is higher, and the stability of the in-wheel motor is better.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should all be included in the scope of the claims of the present invention.

Claims (6)

1. The utility model provides a pin shaft formula cycloid in-wheel motor which characterized in that: the cycloidal reducer assembly comprises a rotating arm, a cycloidal planetary gear and a pin wheel, wherein the cycloidal planetary gear is sleeved on the rotating arm, and the pin wheel is matched with the cycloidal planetary gear; end plates for supporting the rotating arm are arranged on two sides of the cycloid planet gear, the cycloid planet gear is connected with the end plates through pin shafts, and the pin shafts are used for limiting the rotation of the cycloid planet gear; the pin gear shell of the pin wheel is arranged on the inner side of the hub, and the pin gear shell of the pin wheel is fixed on the hub or integrally designed with the hub; the motor assembly comprises a motor rotor fixed on the rotating arm and a motor stator arranged on the circumference of the motor rotor.

2. The pin-shaft gerotor in-wheel motor of claim 1, further comprising: the motor assembly is located on one side, away from the cycloid planet wheel, of the end disc.

3. The pin-shaft gerotor in-wheel motor of claim 1, further comprising: and the motor shell positioned on the outer side of the motor stator is fixedly connected with the end disc, and one end of the motor shell facing the end disc is open.

4. The pin-shaft gerotor in-wheel motor of claim 1, further comprising: and a tumbler bearing is arranged between the cycloid planet wheel and the tumbler and is a full-complement cylindrical roller bearing.

5. The pin-shaft gerotor in-wheel motor of claim 1, further comprising: first sleeves used for limiting the cycloid planet gears to move axially are arranged on two sides of each cycloid planet gear, and the first sleeves are sleeved on the rotating arms.

6. The pin-shaft gerotor in-wheel motor of claim 1, further comprising: a central bearing is arranged between the rotating arm and the end disc, a second sleeve is arranged between the central bearing close to one side of the motor rotor and the motor rotor, and the second sleeve is sleeved on the rotating arm.

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