CN2418041Y - Cycloidal reduction type electric wheel motor - Google Patents

Abstract

The cycloid speed-reducing electric wheel motor comprises a wheel shell, a fixed shaft penetrates through the center of the wheel shell, and the motor is fixedly arranged on the fixed shaft. One side of the motor shell is fixedly provided with a roller pin fixing ring, the inner ring surface of the motor shell is axially and uniformly provided with a plurality of roller pins, and the output shaft of the motor at the same side is eccentric. The eccentric shaft is sleeved with a cycloid fluted disc, the diameter of the cycloid fluted disc is smaller than the diameter of the inner ring surface of the needle roller fixing ring and is meshed with the needle roller fixing ring. The cycloidal fluted disc surface is provided with a transmission hole, and a plug pin of the speed reduction disc surface eccentrically penetrates into the transmission hole so as to ensure that the speed reduction disc is linked with the wheel shell. The motor drives the cycloid fluted disc to revolve in the roller pin fixing ring and to rotate at a reduced speed due to tooth-shaped meshing, and then the reduction disc and the wheel shell are driven to rotate by the transmission hole.

Description

Cycloidal reduction type electric wheel motor

The utility model relates to a cycloid deceleration electric wheel motor, in particular to a cycloid deceleration electric wheel motor directly installed in the center of the wheel to drive the wheel to rotate.

The structure of a traditional electric rim motor is shown in FIG. 1 , which mainly includes a wheel housing 10 , a motor housing 20 , a stator ring 30 , a rotor disk 40 , a fixed shaft 50 and a planetary reduction gear set 60 . The main purpose of this rim motor is to be directly arranged at the center of the wheel, and the wheel housing 10 is rotated by means of the motor structure of the motor housing 20, the stator ring 30 and the rotor disk 40 to directly rotate the wheel. Since the output speed of the rotor disk 40 is too high, the wheel housing 10 must be decelerated before it can be driven to rotate. A common deceleration method is to set a planetary reduction gear set 60, and the output shaft 401 of the rotor disc 40 drives the three planetary gears 601 of the planetary deceleration gear set 60 to revolve in the inner ring 602 to obtain a deceleration effect, so that the planetary disc 603 transmits power to Give the wheel housing 10 and turn around. Since the design of most speed reduction mechanisms can only think of using gears, the electric wheel rim motor obtains the speed reduction function through the planetary speed reduction gear set 60 . But well-known gear transmission still has quite a few defectives.

1. The gear meshing transmission system produces frictional motion at the diameter of the pitch circle, so its installation error needs to be small and a large amount of lubricating oil must be used. If the gear installation error is too large, the oil quality is not suitable or the oil quantity is insufficient, the tooth surface of the gear is easily scratched (as shown in part A of Figure 3), and the more serious situation is the tooth surface defect (as shown in part B of Figure 3). In this case, the service life of the gears is unlikely to be long.

2. When the gear rotates, it is very easy to collide. If things go on like this, its tooth top angle will be easily lost (as shown in part C of Figure 3), and the continuous impact will easily cause the tooth profile to break (as shown in part D of Figure 3). This kind of disadvantage can be caused by See the gears replaced by the maintenance machine.

3. When the gear is used as a reduction mechanism, the reduction ratio of the two gears meshing is not large, generally no more than 1:10 (considering the limited utilization range in the design), so an intermediate gear must be added to achieve a high reduction ratio. If the predetermined reduction ratio is 1:20, it needs to be divided into multi-stage reduction, and several gears need to be used. Such a design will make the reduction mechanism quite heavy and complicated, often making the reduction mechanism larger than the motor itself. This reduction mechanism can also be seen in commonly used electric wheel rim motors (as shown in Figure 4), that is, a drive gear 604' is sleeved on the output shaft 401' of the rotor disk 40, and then the drive gear 604' is connected to a large The gears 605 are engaged, and then a small gear 606' is arranged in the center of one side of the large gear 605', and then the pinion 606' is meshed with the final driven gear 607'. In this way, the internal structure of the electric wheel rim motor will be complicated, and its thickness and weight will be increased. If it is installed on a lightweight electric bicycle, it will be more abrupt.

The purpose of this utility model is to design a cycloidal reduction type electric wheel motor to simplify its reduction mechanism and achieve a high reduction ratio, while avoiding damage to the gears, so as to prolong the overall service life of the electric wheel rim motor.

In order to achieve the above purpose, the utility model makes the output shaft of the rim motor eccentric and sets a cycloidal toothed disc on the eccentric shaft, and a needle roller fixing ring is fixed on one side of the motor to make the inner ring roll The needle meshes with the cycloidal toothed disc, and the number of needle rollers increases by more than one tooth pitch than the number of arc grooves of the cycloidal toothed disc. When the motor drives the cycloidal toothed disc, the cycloidal toothed disc revolves in an eccentric meshing shape in the fixed ring of the needle roller. When the cycloidal toothed disc revolves one revolution, it rotates in the opposite direction due to the small number of teeth, and is driven by the rotation angle. The wheel shell of the rim motor can obtain a high speed reduction effect, and its structure is still simplified. The technical features of the cycloid reduction electric wheel motor of the utility model will be further described in detail below in conjunction with specific embodiments.

Figure 1 is a cross-sectional view of the composition and structure of a common rim motor;

Figure 2 is a schematic diagram of a common planetary gear meshing state;

Figure 3 is a three-dimensional schematic diagram of common gear-prone defects;

Figure 4 is a structural sectional view of a common multi-stage reduction rim motor;

Fig. 5 is a three-dimensional exploded structure diagram of the utility model;

Fig. 6 is the front sectional view of the composition state of the present utility model;

Fig. 7 is a side view half-sectional view of the composition state of the utility model;

Figures 8, 9, 10, 11, and 12 are action schematic diagrams of the utility model's cycloidal reduction mechanism running one circle continuously;

Fig. 13 is a three-dimensional structural diagram of the utility model with two cycloid tooth discs;

Fig. 14 is a combined sectional view of the utility model with two cycloid toothed discs;

Fig. 15 is a front combined sectional view of another embodiment of the utility model;

Fig. 16 is a side view half-sectional view of another embodiment of the utility model;

Fig. 17 is a three-dimensional structure diagram of other embodiments of the present invention;

Fig. 18 is a schematic partial cross-sectional view of other embodiments of the present invention;

Fig. 19 is a partial side view of other embodiments of the present utility model.

Description of drawing numbers of main components:

Wheel housing 10, motor housing 20, stator ring 30, rotor disc 40, output shaft 401, 401', fixed shaft 50, planetary reduction gear set 60, planetary gear 601, inner ring gear 602, planetary disc 603, driving gear 604' , large gear 605', pinion gear 606', driven gear 607', wheel housing 1, disc cover 11, 11', ring 12, hook holes 111, 111', clutch 13, bearing 14, motor 2, output shaft 21, eccentric shaft 22, through hole 211, fixed shaft 3, threaded sections 31, 31', slot 32, cycloidal reduction mechanism 4, needle roller fixing ring 41, ring 411, needle roller 412, ring-shaped support piece 413 , Cycloid tooth discs 42, 42', tooth grooves 421, convex teeth 422, transmission holes 423, rolling elements 424, balance plates 425, deceleration discs 43, pins 431, self-lubricating bearings 432, protruding shafts 433, through holes 434, Bearing 435, needle roller fixed ring 41A, wave-shaped tooth 411A, cycloid tooth disc 42A, wave-shaped tooth 421A, clutch 5, belt 51, protective cover 6.

Referring to FIGS. 5-7 , the utility model cycloid reduction electric wheel motor mainly includes a wheel housing 1 , a motor 2 , a fixed shaft 3 and a cycloid reduction mechanism 4 .

The wheel shell 1 is a hollow shell installed in the center of the wheel of the electric vehicle. It includes two disc covers 11, 11' opposite to each other with a ring 12 interposed therebetween. Several hook holes are uniformly arranged around the two disc covers 11, 11'. 111, 111' are hooked up for the spokes of the electric vehicle wheels, or the tires are directly installed around the wheel shell 1, and thereby the wheel shell 1 drives the wheel to rotate. Wherein the center of disc cover 11 is provided with a clutch 13 (clutch 13 is drum clutch, overrunning clutch, ball type or roller clutch etc.), and the center of another disc cover 11' is provided with a bearing 14.

The motor 2 is an electric motor installed inside the wheel housing 1. It can be a DC motor or an AC motor. An output shaft 21 extends from the center of one side. The front end of the output shaft 21 has an eccentric shaft 22. The output shaft 21 A through hole 211 axially penetrating is formed in the center.

The fixed shaft 3 straddles the end of the fork rod of the electric vehicle wheel. Both ends of the shaft have threaded sections 31, 31' to provide screw fixation. The shaft body is used to fix the motor 2. One end of the shaft body is provided with a slot 32 and axially extending over a section of the shaft.

The cycloid reduction mechanism 4 includes a fixed needle roller ring 41 , a cycloid toothed disc 42 and a reduction disc 43 . A plurality of needle rollers 412 are uniformly fixed on the inner ring surface of the ring 411 of the needle roller fixing ring 41 in an axial direction, and each needle roller 412 is coupled to a ring-shaped support piece 413 on one end surface. The cycloidal toothed disc 42 is disc-shaped and its diameter is smaller than the diameter of the inner ring surface of the needle roller fixing ring 41. Several arc tooth grooves 421 are formed on the circumference of the cycloidal toothed disc 42, thereby forming the circumference of the cycloidal toothed disc 42. There are several convex teeth 422, and one or more transmission holes 423 are provided at the eccentric appropriate position of the cycloidal toothed disc 42. If there are more than one transmission holes 423, they are equiangularly and evenly distributed, and the center of the cycloidal toothed disc 42 There is a hole for nesting a rolling element 424 , and the rolling element 424 can be a bearing or a self-lubricating bearing, and a balance plate 425 is fixed on a side edge of the cycloid toothed disc 42 . The deceleration disc 43 is in the shape of a disc, and one or more pins 431 are provided at an appropriate position on one side of the disc. Bearing 432 is lubricated, and a protruding shaft 433 is formed in the center of the other side of the deceleration disc 43, and a through hole 434 is axially penetrated in its center for implanting bearing 435.

In the cycloid reduction type electric wheel motor structure composed of the above components (as shown in Figure 6 and Figure 7), the needle roller fixing ring 41 is fixed in parallel on the side of the motor 2 with the output shaft 21 and makes the needle roller fixing ring 41 just around the output shaft 21 . The cycloid toothed disc 42 is sleeved on the eccentric shaft 22 at the front end of the output shaft 21 with its central rolling element 424, and because the cycloidal toothed disc 42 is eccentrically arranged, it can mesh with the needle roller 412 of the needle roller fixing ring 41; The deceleration disc 43 passes through the clutch 13 of the disc cover 11 with the protruding shaft 433 on one side thereof, and the two disc covers 11, 11 ' are in a relative shape to clamp the ring 12 to form the wheel housing 1, and thereby the The motor 2 is covered inside, so that the pins 431 of the reduction disc 43 are eccentrically inserted into the transmission holes 423 of the cycloidal toothed disc 42 , and the self-lubricating bearing 432 is only in contact with the walls of the transmission holes 423 . The fixed shaft 3 passes through the clutch 13 and the bearing 14 of the two disk covers 11, 11', and passes through the through hole 211 in the center of the output shaft 21 of the motor 2 and the bearing 435 in the through hole 434 of the reduction disc 43, so that the motor 2 is fixed on the Fix axis 3 on the shaft body. In this way, the motor 2 and the needle roller fixing ring 41 on one side cannot rotate, and only the output shaft 21 can drive the cycloid toothed disc 42, the speed reduction disc 43 and the wheel housing 1 to rotate, and become the cycloid deceleration electric wheel of the present invention. motor.

The cycloid deceleration type electric wheel motor of the utility model can be screwed to the fork rod end of the electric vehicle wheel through the fixed shaft 3, so that when the motor 2 starts, the eccentric shaft 22 drives the cycloid gear plate 42 and fixes it with the needle roller. The ring 41 is internally engaged, so when the cycloidal toothed disc 42 rotates in the reverse direction, the cycloidal toothed disc 42 is positively decelerated and rotated due to the cooperation of the tooth groove 421 and the needle roller 412, and the result of the decelerated rotation can drive the deceleration disc 43 to rotate ( As shown in Figures 8-12), the wheel shell 1 is further made to generate a decelerated rotational speed, so that the wheel rotates and advances.

Its deceleration effect needs to be explained in particular. As shown in FIG. 8 , there are 18 needle rollers 412 in the needle roller fixing ring 41 , and the cycloid toothed disc 42 has 17 teeth in total. When the eccentric shaft 22 of the motor 2 drives the cycloidal toothed disc 42 to rotate to the left, the cycloidal toothed disc 42 rotates in the opposite direction, and the tooth groove 421 of the cycloidal toothed disc 42 that was originally meshed is disengaged and moves leftward ( As shown in Figures 9, 10, and 11). When the cycloidal toothed disc 42 is driven by the eccentric shaft 22 to revolve one revolution, that is, because there is a tooth pitch difference between the cycloidal toothed disc 42 and the needle roller 412 of the needle roller fixing ring 41, the cycloidal toothed disc 42 rotates by itself. The angle of the pitch (as shown in Figure 12). Therefore, when the eccentric shaft 22 of the motor 2 rotates 18 times, the cycloidal gear disc 42 only rotates one time, and its reduction ratio is 1:18. Obviously, the reduction effect is higher than that of gears, and it does not need to be divided into several stages of reduction, and its structure is still more streamlined than gears. And when the cycloid toothed disc 42 rotates, the latch 431 of the deceleration disc 43 can be stirred by the transmission hole 423 to make the deceleration disc 43 decelerate and rotate, and then the wheel housing 1 is driven to rotate through the clutch 13 to make the electric vehicle wheel rotate. In this way, not only the whole reduction mechanism is still quite simple but also has a high reduction ratio. In summary, the utility model cycloid reduction type electric wheel motor has eliminated various disadvantages of the aforementioned gear reduction.

As shown in Fig. 13 and Fig. 14, the utility model can also set two cycloid toothed discs 42, 42' in the needle roller fixing ring 41, so that the two cycloidal toothed discs 42, 42' are both sleeved on the motor 2 On the eccentric shaft 22, but the eccentric positions of the two cycloid toothed discs 42, 42' are in opposite directions, thereby obtaining a balanced state and preventing the cycloid reduction type electric wheel motor from vibrating when it rotates rapidly. In this way, not only does not affect the deceleration effect, but also makes the whole deceleration mechanism run more smoothly. Of course, in order to achieve the balance of fast rotation, no noise and no vibration, the weight balance can also be corrected by attaching a load to achieve smooth rotation.

Furthermore, the meshing tooth shape of the needle roller fixing ring 41 and the cycloid toothed disc 42 in the present invention is not limited to the structure of the above needle roller 412 . As shown in Fig. 15 and Fig. 16, several wavy teeth 411A can be directly formed on the inner ring surface of the needle roller fixing ring 41A, and the tooth shape around the opposite cycloid tooth disc 42A also forms wavy teeth 421A, so that the Smooth engagement. Other conceivable tooth shapes all can be easily implemented in the utility model, and are only explained in passing.

The utility model mainly makes the structure of the deceleration motor of the electric vehicle more streamlined, and does not have to be constrained by the design principle of the gear reduction ratio, so the cycloidal deceleration electric wheel motor of the utility model is not limited to be installed in the center of the wheel of the electric vehicle. As shown in Figures 17, 18, and 19, the structure of the wheel housing 1 in the utility model can also be canceled, and only the motor 2, the fixed shaft 3 and the cycloid deceleration mechanism 4 are reserved, and a protective cover 6 is added, and then the pendulum A drum clutch 5 (or other types of clutches) is sheathed on the outside of the reduction disc 43 of the linear reduction mechanism 4, and the drum clutch 5 cooperates with a belt 51 to drive the wheels to rotate. In this way, the cycloid deceleration type electric wheel motor of the utility model can be installed at any position of the frame of the electric vehicle, and can also decelerate and drive the electric vehicle to travel. Because the drum clutch 5 is a commonly used device, its detailed structure is no longer described in detail.

Claims (9)

1, a kind of Cycloidally speed reduced wheel motor for electric vehicles is characterized in that comprising hub, motor, anchor shaft and cycloid speed reducer structure;

Described hub is to be installed in the hollow housing of battery-driven car wheel central authorities and to be used to drive the wheel revolution;

Described motor is for being installed in hub in-to-in electro-motor, and a force-output shaft extends in one side central authorities, and the force-output shaft front end has one section eccentric shaft, and force-output shaft central authorities form a through hole that axially runs through;

Described anchor shaft is striden and is located at electric bicycle wheel fork rod end, and axle body is used for fixing motor;

Described cycloid speed reducer structure comprises needle roller set collar, cycloid fluted disc and deceleration dish; The inner ring surface of needle roller set collar is and axially is installed with some needle rollers; The cycloid fluted disc be discoid and its diameter less than needle roller set collar inner ring surface diameter, its circumference is formed with several circular arc teeth groove, the card appropriate position has one or more driving holes, its central authorities have the hole that is used to be nested with rolling element; The deceleration dish is a plate-like, and a side panel face appropriate position is provided with one or more latches, and latch is corresponding with cycloid fluted disc driving hole, and deceleration dish opposite side card central authorities are provided with a protruding axle, and a through hole is axially run through in its central authorities;

The needle roller set collar is fixedly arranged on motor force-output shaft side and around force-output shaft, the cycloid fluted disc is sheathed on the front end eccentric shaft of motor force-output shaft by rolling element, the cycloid fluted disc is eccentric shape and matches with the needle roller of needle roller set collar, the deceleration dish combines with hub by its protruding axle, motor is coated on hub inside, the latch of deceleration dish and driving hole are in each driving hole of eccentric shape insertion cycloid fluted disc, anchor shaft runs through the through hole and the deceleration dish through hole of motor force-output shaft, motor is fixedly arranged on the axle body of anchor shaft, with constitute motor and one sidewinder the pin set collar can not turn state, only force-output shaft can drive the cycloid fluted disc, deceleration dish and hub revolution.

2, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1, it is characterized in that described hub comprise two disk covers and relatively folder establish an annulus, evenly be provided with several around two disk covers and collude the hole, one side central authorities are installed with a power-transfer clutch, the sheathed bearing of opposite side central authorities is so that hub drives the wheel revolution; Described anchor shaft two ends are provided with thread segment to be fixed at battery-driven car wheel two fork arm ends, and anchor shaft one end is provided with fluting or perforation passes in order to electric wire.

3, Cycloidally speed reduced wheel motor for electric vehicles according to claim 2 is characterized in that described deceleration coils the protruding axle of a side and be inserted in the power-transfer clutch hole of disk cover central authorities, so that the deceleration dish drives the hub revolution by power-transfer clutch.

4, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1, it is characterized in that described deceleration coil each latch outer race be equipped with self lubricating bearing or rolling element and with the transmission hole wall moving contact of cycloid fluted disc.

5, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1, each needle roller that it is characterized in that described needle roller set collar are jointly in the side cast supporting blade that is coupled.

6, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1 is characterized in that being provided with two cycloid fluted discs in the described needle roller set collar, and two cycloid fluted discs all are sheathed on the eccentric shaft of motor, and its eccentric position is opposite sense.

7, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1 is characterized in that needle roller set collar inner ring surface directly forms several waveform teeth, also forms the wave profile of tooth around the cycloid fluted disc.

8, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1 is characterized in that the deceleration dish sheathed power-transfer clutch in the outside of described cycloid speed reducer structure and cooperates a belt to drive wheel.

9, Cycloidally speed reduced wheel motor for electric vehicles according to claim 1 is characterized in that described cycloid fluted disc one side sets firmly a balancing patch.

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