CN110562883A

CN110562883A - Electric carrier

Info

Publication number: CN110562883A
Application number: CN201910905119.6A
Authority: CN
Inventors: 梁思平; 朱荣锋; 朱百羽; 梁之鼎
Original assignee: Linhai Zhiding Electronic Technology Co Ltd
Current assignee: Linhai Zhiding Electronic Technology Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2019-12-13

Abstract

The invention provides an electric truck, and belongs to the technical field of machinery. It has solved the problem that current electric pallet truck structure is complicated, the energy consumption is high. The electric carrier comprises a frame, an operating handle, a wheel shaft and driving wheels rotatably connected to two ends of the wheel shaft, wherein a bearing body is rotatably connected in each driving wheel, the wheel shaft is fixed on the bearing body, an outer rotor motor is arranged in each bearing body and can drive the driving wheels to rotate relative to the bearing bodies, and the operating handle is connected with the wheel shaft and can drive the wheel shaft to swing. The driving wheel of the carrier has the functions of driving, steering and bearing, a transmission mechanism between a motor and the driving wheel, an auxiliary supporting wheel for bearing and a steering bearing wheel for realizing steering are omitted, the structure is simplified, the weight is reduced, the energy consumption is reduced, and the utilization rate of electric energy is improved.

Description

Electric carrier

Technical Field

The invention belongs to the technical field of machinery, and relates to an electric carrier.

Background

In logistics and warehousing operations, traditional manual transportation is generally replaced by mechanical transportation due to various reasons such as high working strength and low working efficiency. The existing carrier is mainly divided into a manual carrier and an electric carrier, and the electric carrier can save a large amount of manpower and improve the working efficiency in the process of shipping at noon, so that the electric carrier is widely applied. And electric pallet truck generally divide into single drive wheel carrier and dual drive wheel carrier, and the dual drive wheel carrier is more steady than single drive wheel carrier.

For example, the chinese patent application (application No. 201610126238.8) discloses an electric pallet truck structure with a small turning radius, which comprises a truck body, a pallet frame mounted on the truck body, a lifting device for lifting the pallet frame on the truck body, and an operating device for controlling steering, wherein the operating device comprises a driving wheel and a handle, the pallet frame is connected with a walking bearing wheel with adjustable ground clearance and a steering bearing wheel with adjustable ground clearance, the axial direction of the wheel body of the steering bearing wheel forms an angle α with the advancing direction of the truck body, the angle α is an acute angle, and the electric pallet truck structure further comprises an auxiliary supporting wheel for auxiliary supporting and auxiliary steering, and the auxiliary supporting wheel is a universal wheel.

In the existing electric truck, two driving wheels are connected to two ends of a wheel shaft through bearings, and the electric truck is used for carrying heavy objects of several tons, and the bearing on the driving wheels is used alone to bear the weight, so that the requirement cannot be met at all, and an additional auxiliary supporting wheel needs to be arranged. Meanwhile, the two driving wheels are respectively driven by the two motors, the driving wheels are connected with the motors through transmission of belts or chains and the like, the motors are powered through battery boxes on the frame, the driving wheels can play a role of only providing running driving force due to the limitation of transmission structures such as the belts and the chains and the limitation of circuits between the battery boxes and the motors, and the purpose of steering is realized, the driving wheels are all realized through additionally arranged steering bearing wheels, the mutual interference between the walking bearing wheels and the steering bearing wheels is avoided, the two driving wheels need to alternately land to complete corresponding functions, and therefore a lifting structure needs to be arranged, so that the structure of the whole carrier is complex, the weight of the whole carrier is increased, the energy consumption is improved, and the electric energy utilization rate is reduced. In addition, if the above-mentioned transport vehicle needs to turn during the transportation and traveling process, the transport vehicle in traveling needs to stop first, then control the traveling bearing wheel to ascend and descend and land, and then turn. After the steering is finished, in order to avoid interfering with the advancing direction, the carrier needs to be stopped, the walking bearing wheel is controlled to land, the steering bearing wheel rises and does not land, the operation process is complicated and inconvenient, the steering can be performed only according to a fixed angle during the steering, and the use convenience is poorer.

Disclosure of Invention

The invention aims to provide an electric truck aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to solve the problem of overhigh energy consumption caused by complex structure.

The purpose of the invention can be realized by the following technical scheme: an electric carrier comprises a frame, an operating handle, a wheel shaft and driving wheels rotatably connected to two ends of the wheel shaft, and is characterized in that a bearing body is rotatably connected in the driving wheels, the wheel shaft is fixed on the bearing body, an outer rotor motor is arranged in the bearing body and can drive the driving wheels to rotate relative to the bearing body, and the operating handle is connected with the wheel shaft and can drive the wheel shaft to swing.

This electric pallet truck through carrying out the improved design to the drive structure of drive wheel, will control the drive wheel pivoted driving source and directly place in the drive wheel in the form of outer rotor motor, saved the drive mechanism between motor and the drive wheel, simplified the structure. And set up the bearing body in the drive wheel to an contrary conventional design, with the external rotor motor integration embedded in the bearing body, thereby there is enough space to do the overall structure of bearing body bigger relatively, length also can be done longer, make have bigger bearing and area of contact between bearing body and the drive wheel, compare with current bearing structure bearing capacity higher, can satisfy the bearing demand of carrier, consequently, need not to additionally set up the auxiliary stay wheel again in the carrier, further simplified the structure. Meanwhile, the operating handle is directly connected with the wheel shaft, the rotating shaft is driven to rotate by controlling the operating handle to drive the wheel shaft to synchronously swing, so that the driving wheel can be driven to swing to realize real-time steering, the driving wheel has a steering function, a steering bearing wheel does not need to be additionally arranged, and the structure is further simplified again. That is to say, the above-mentioned structural improvement of this electric pallet truck simplifies for the drive wheel has possessed the function of drive, turn to and the bearing simultaneously, has reduced the weight of whole car, has reduced the energy consumption, has improved the utilization ratio of electric energy, has also reduced the cost of preparation. Meanwhile, the real-time steering of the carrier can be realized only by controlling the swing of the operating handle during the carrying process, the operation is simpler and more convenient, the swing amplitude of the operating handle can be controlled to adapt to the steering at different angles, and the use is more convenient.

In the electric truck, the frame is rotatably connected with a rotating shaft in the vertical direction, one end of the rotating shaft is fixedly connected with the wheel shaft, the other end of the rotating shaft is fixedly connected with the connecting seat, the operating handle is connected to the connecting seat, and the operating handle and the rotating shaft are arranged in a staggered mode in the vertical direction. Through foretell setting, be Z style of calligraphy between operating handle and the revolving axle and distribute, can drive the revolving axle through swing handle and rotate to driving the swing of wheel axle and realizing turning to of drive wheel, need not to additionally set up again and turn to the bearing wheel, further simplified the structure, reduced the weight of whole car, improved the utilization ratio of electric energy, also reduced the cost of preparation. Meanwhile, by the arrangement, the principle of the lever is well utilized, so that the operation is simpler, more convenient and more labor-saving.

In the above electric truck, the truck further includes a power supply and a driver for controlling the operation of the outer rotor motor, the power supply and the driver are both electrically connected to the outer rotor motor, and both the power supply and the driver are disposed between the two driving wheels and fixed to the wheel shaft. The driver can two external rotor electric machine work of synchronous drive when the carrier is gone straightly to realize two drive wheels of synchronous drive, angle sensor in the driver can control two external rotor electric machine's rotational speed separately when turning, thereby realize two drive wheels of differential drive, when stopping or emergency braking, can lock external rotor electric machine, improved the controllability and the security of carrier motion in-process. The power and the driver are fixed on the wheel shaft between the two driving wheels, so that the driving wheels, the driver and the battery are in the same rotating plane, when the driving wheels turn, the driver and the battery can synchronously turn, namely, in the turning process, the driving wheels, the relative position between the driver and the battery is unchanged, thereby ensuring that the wires which are connected with each other cannot be distorted and deformed to cause damage and breakage, simultaneously saving the installation space of the battery and the driver on the frame, further simplifying the structure of the vehicle body, improving the utilization rate of electric energy and reducing the manufacturing cost.

In the electric truck, the power supply and the driver are integrally fixed in the electric cabinet, one end of the rotating shaft is located between the two driving wheels and is provided with a connecting hole which penetrates in the radial direction, the wheel shaft penetrates through the connecting hole, two connecting plates extend outwards from the electric cabinet and are arranged close to two sides of the electric cabinet, the two connecting plates are provided with positioning holes, the wheel shaft penetrates through the two positioning holes, and the two connecting plates are respectively located on two sides of the rotating shaft. Through the aforesaid setting, the reasonable space that has utilized between two drive wheels, install battery and driver integration on the shaft of this department, turn to the in-process, the drive wheel, the relative position between driver and the battery is unchangeable, thereby can guarantee that interconnect's wire can not produce distortion and lead to damaging the rupture between them, the installation space of battery and driver on the frame has also been saved simultaneously, vehicle body structure has further been simplified, the utilization ratio of electric energy has been improved, the cost is reduced.

In the electric truck, a bottom plate extends out of the bottom of the electric cabinet, a yielding cavity is formed between the bottom plate and the two connecting plates in a surrounding mode, the rotating shaft extends into the yielding cavity, a gap is formed between the end face of the rotating shaft and the bottom plate, and wire passing holes communicated with the yielding cavity are formed in the two connecting plates. The stepping cavity can be used for placing wire harnesses such as wires and the like, and the wires are arranged in the wire passing holes, so that the wires can penetrate into the driving wheel through the wire passing holes to be electrically connected with the outer rotor motor.

In foretell electric pallet truck, the bearing body is cylindricly, the external fixed cover of bearing is equipped with bearing one, the outer lane of bearing one with the internal perisporium tight fit of drive wheel is connected, the shaft is fixed to be worn to establish on the bearing body and the tip penetrates the bearing body and links firmly with the external rotor electric machine, the output shaft of external rotor electric machine stretches out the bearing body and is connected with the reduction gear, the reduction gear is connected with the drive wheel. The bearing body is connected with the inner wall of the driving wheel through the bearing I, so that the rotor is guaranteed to rotate to drive the driving wheel to rotate relative to the bearing body, the bearing body improves the bearing capacity of the whole driving wheel, the driving wheel has the bearing function, an auxiliary supporting wheel does not need to be additionally arranged, the structure is simplified, and the utilization rate of electric energy is improved.

Preferably, the first bearing is provided with two bearings, and the two bearings are arranged at intervals and are fixedly sleeved at two ends of the bearing body respectively. Through setting up bearing one respectively at the both ends of bearing body, can guarantee the atress dispersion for whole has better bearing capacity, two bearing one interval sets up simultaneously, and inner circle and bearing body tight fit, outer lane and the inner wall tight fit of drive wheel surround formation one between two bearing one in other words and strengthen the cavity structure, further promoted the holistic bearing capacity of drive wheel.

In the electric truck, the outer rotor motor includes a stator and a rotor capable of rotating relative to the stator, the stator and the rotor are both disposed in the bearing body, one end of the wheel shaft penetrates into the bearing body and is fixedly connected with the stator, the rotor is provided with the output shaft, and a gap is formed between the rotor and the inner wall of the bearing body. The stator and the rotor are both positioned in the bearing body, the stator is fixed on the wheel shaft, a gap is formed between the rotor and the inner wall of the bearing body, the whole outer rotor motor is fixed on the wheel shaft and suspended in the bearing body, the outer rotor motor does not bear any bearing force, and the outer rotor motor is not easy to damage. And the outer rotor motor is not subjected to bearing capacity, so that smooth driving of the driving wheel can be guaranteed, and the utilization rate of electric energy is improved.

In the electric truck, the speed reducer includes a cycloid needle wheel and an annular needle gear ring, the needle gear ring is fixed on the load bearing body, a plurality of needle gear needles are circumferentially arranged on an inner wall of the needle gear ring, the cycloid needle wheel is arranged in the needle gear ring in a penetrating manner and is matched with the needle gear needles, the cycloid needle wheel is rotatably connected to the output shaft and is eccentrically arranged relative to the output shaft, and the cycloid needle wheel is fixedly connected with the driving wheel. The reduction gear adopts cycloid pinwheel reduction gear, for reduction gears such as current planetary gear, it is big to have a reduction ratio, and transmission efficiency is high, and is small, light in weight, and the trouble is few, and is longe-lived, and it is reliable to operate steadily, and the noise is little, easy dismounting, easy maintenance, simple structure, and overload capacity is strong, and is shock-resistant, advantages such as moment of inertia is little to can make the simplification more of holistic structure, weight is lighter, has further improved the utilization ratio of electric energy. And just because cycloid pinwheel reduction gear is small, light in weight, therefore its installation space that occupies in the drive wheel is also less to provide bigger installation space for the bearing body again, thereby can do the overall structure of bearing body bigger relatively, length also can be done longer, the ability of bearing is higher.

In the electric truck, the output shaft is connected to an eccentric shaft, and the cycloid pin gear is connected to the eccentric shaft through a second bearing. Through the design, the output shaft of the outer rotor motor rotates for one circle, the cycloid pinwheel arranged on the eccentric shaft and the bearing II revolves for one circle, and simultaneously, the cycloid pinwheel also rotates for one tooth angle, so that the driving wheel connected with the cycloid pinwheel also rotates for one tooth angle, and the driving wheel can be driven to rotate and decelerate by the rotation of the outer rotor motor. Alternatively, the cycloidal pin gear is connected to the output shaft by an eccentric bearing.

In the electric truck, the driving wheel is further provided with a torque connecting piece, one side of the torque connecting piece is fixed with the cycloid pin wheel through the connecting column, and the other side of the torque connecting piece is attached to the inner wall of the driving wheel and fixed with the driving wheel. The torque connecting piece is used for transmitting output torque, so that the outer rotor motor can drive the driving wheel to rotate.

Compared with the prior art, this electric pallet truck has following advantage:

1. The driving wheel has the functions of driving, steering and bearing, a transmission mechanism between the motor and the driving wheel, an auxiliary supporting wheel for bearing and a steering bearing wheel for realizing steering are omitted, the structure is simplified, the weight is reduced, the energy consumption is reduced, and the utilization rate of electric energy is improved.

2. Only need control operating handle's swing just can realize turning to in real time of carrier during the transport, control operating handle's swing range can realize adapting to turning to of different angles moreover, and operation and use are also more convenient.

3. The power supply and the driver are fixed on the wheel shaft between the two driving wheels, so that the driving wheels, the driver and the battery are positioned in the same rotating plane, and the relative positions among the driving wheels, the driver and the battery are unchanged in the steering process, so that the fact that the wires connected with one another cannot be distorted and deformed to cause damage and breakage can be guaranteed.

Drawings

Fig. 1 is a perspective view of the electric truck.

Fig. 2 is a perspective view of the electric truck without an electric cabinet.

FIG. 3 is a perspective view of the electric truck without the electric cabinet and the driving wheel.

Fig. 4 is an exploded view of the drive wheel.

Fig. 5 is a sectional view of the drive wheel.

Fig. 6 is a perspective view of the rotor.

Fig. 7 is a perspective view of the electric cabinet.

In the figure, 1, a frame; 2. an operating handle; 3. a wheel axle; 4. a drive wheel; 5. a load bearing body; 6. an outer rotor motor; 6a, a stator; 6b, a rotor; 6c, an output shaft; 6d, an eccentric shaft; 7. a rotating shaft; 7a, a connecting hole; 8. a connecting seat; 9. an electric cabinet; 9a, a connecting plate; 9a1, locating holes; 9a2, wire through hole; 9b, a bottom plate; 9c, a yielding cavity; 10. a first bearing; 11. a speed reducer; 11a, a cycloidal pin wheel; 11b, a needle gear ring; 11c, needle tooth roller pins; 12. a second bearing; 13. a torsion connecting sheet; 14. a third bearing; 15. a pallet fork; 16. a driven wheel; 17. and (4) a jacking device.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-3, the electric truck includes a frame 1, an operating handle 2, two forks 15, a jack 17 capable of driving the two forks 15 to swing up and down to lift, a wheel shaft 3, and a driving wheel 4 rotatably connected to two ends of the wheel shaft 3. Driven wheels 16 are arranged on the two forks 15 and can synchronously rotate under the driving of the driving wheels 4. The frame 1 is rotatably connected with a rotating shaft 7 along the vertical direction, and one end of the rotating shaft 7 is fixedly connected with a connecting seat 8. In this embodiment, jacking ware 17 is manual jack, and operating handle 2 passes through the articulated shaft and articulates on connecting seat 8, still is equipped with return spring between operating handle 2 and the connecting seat 8, pulls operating handle 2 from top to bottom and can control two fork 15 realization lifts of manual jack jacking. Of course, alternatively, the jack 17 may be an electro-hydraulic jack or an electro-screw jack.

The other end of the rotating shaft 7 is positioned between the two driving wheels 4 and is provided with a connecting hole 7a which penetrates through the radial direction, the wheel shaft 3 penetrates through the connecting hole 7a, the operating handle 2 and the rotating shaft 7 are arranged in a staggered mode along the vertical direction, namely the operating handle 2 and the rotating shaft 7 are distributed in a Z shape, the operating handle swings along the horizontal direction, the rotating shaft 7 can be driven to rotate through the lever principle, and therefore the wheel shaft 3 is driven to swing.

Specifically, as shown in fig. 4-6, a bearing body 5 is rotatably connected in the driving wheel 4, the bearing body 5 is cylindrical, a first bearing 10 is fixedly sleeved outside the bearing body 5, the first bearing 10 has two bearings, and the two bearings 10 are arranged at intervals and are respectively fixedly sleeved at two ends of the bearing body 5. The outer ring of the first bearing 10 is tightly matched and connected with the inner peripheral wall of the driving wheel 4, which is equivalent to a reinforced cavity structure encircled between the two first bearings 10.

An outer rotor motor 6 is arranged in the bearing body 5, the outer rotor motor 6 comprises a stator 6a and a rotor 6b, the rotor 6b is cylindrical, the stator 6a is arranged in the rotor 6b, the wheel shaft 3 is fixedly arranged on the bearing body 5 in a penetrating mode, the end portion of the wheel shaft penetrates through the bearing body 5 and is fixedly connected with the stator 6a, the rotor 6b is continuously impacted on the wheel shaft 3 through a bearing III 14, and a gap is formed between the rotor 6b and the inner wall of the bearing body 5. The rotor 6b has an output shaft 6c, and the output shaft 6c is connected to a speed reducer 11 extending out of the bearing body 5. In this embodiment, reduction gear 11 adopts cycloid pinwheel reduction gear, for reduction gear 11 such as current planetary gear, it is big to have a reduction ratio, and transmission efficiency is high, and is small, light in weight, and the trouble is few, and is longe-lived, and the steady operation is reliable, and the noise is little, easy dismounting, easy maintenance, simple structure, and the overload capacity is strong, and is shock-resistant, advantages such as moment of inertia is little to can make the simplification more of holistic structure, weight is lighter, has further improved the utilization ratio of electric energy.

Furthermore, the speed reducer 11 includes a cycloid needle gear 11a and an annular needle ring 11b, the needle ring 11b is fixed on the load bearing body 5, a plurality of needle roller pins 11c are circumferentially arranged on an inner wall of the needle ring 11b, and the cycloid needle gear 11a is inserted into the needle ring 11b and is matched with the needle roller pins 11 c. An eccentric shaft 6d is connected to the output shaft 6c, and the cycloid pin gear 11a is connected to the eccentric shaft 6d through a second bearing 12. A torque connecting piece 13 is also arranged in the driving wheel 4, one side of the torque connecting piece 13 is fixed with the cycloid pin wheel 11a through a connecting column, and the other side of the torque connecting piece 13 is attached to the inner wall of the driving wheel 4 and fixed with the driving wheel 4. The output shaft 6c of the external rotor motor 6 rotates one turn, and the cycloid pin gear 11a mounted on the eccentric shaft 6d and the bearing two 12 also rotates one tooth angle along with the revolution, so that the driving wheel 4 connected with the cycloid pin gear 11a also rotates one tooth angle, and the external rotor motor 6 can drive the driving wheel 4 to rotate and decelerate.

As shown in fig. 1 and 7, the present truck further includes a power supply and a driver for controlling the operation of the external rotor motor 6, and the power supply and the driver are integrally fixed in an electric cabinet 9. Two connecting plates 9a extend outwards from the electric cabinet 9, the two connecting plates 9a are arranged close to two sides of the electric cabinet 9, positioning holes 9a1 are formed in the two connecting plates, the wheel shaft 3 penetrates through the two positioning holes 9a1, and the two connecting plates 9a are respectively located on two sides of the rotating shaft 7. A bottom plate 9b extends from the bottom of the electric cabinet 9, a yielding cavity 9c is formed between the bottom plate 9b and the two connecting plates 9a in a surrounding mode, the rotating shaft 7 extends into the yielding cavity 9c, a gap is reserved between the end face of the rotating shaft 7 and the bottom plate 9b, and wire passing holes 9a2 communicated with the yielding cavity 9c are formed in the two connecting plates 9 a. The driver can two external rotor electric machine 6 work of synchronous drive when the carrier is gone straightly to realize two drive wheels 4 of synchronous drive, angle sensor in the driver can control two external rotor electric machine 6's rotational speed separately when turning, thereby realize two drive wheels 4 of differential drive, when stopping or emergency brake, can lock external rotor electric machine 6, improved the nature controlled and the security of carrier motion in-process. Through the space between two drive wheels 4 of reasonable utilization, install battery and driver integration on the shaft 3 of this department, turn to the in-process, the relative position between drive wheel 4, driver and the battery is unchangeable to can guarantee that the wire of interconnect between them can not produce distortion and lead to damaging the rupture, also save the installation space of battery and driver on the frame 1 simultaneously, further simplify vehicle structure, improve the utilization ratio of electric energy, reduce the cost.

The electric carrier has the advantages that the driving source for controlling the rotation of the driving wheel 4 is directly arranged in the driving wheel 4 in the form of the external rotor motor 6, and a transmission mechanism between the motor and the driving wheel 4 is omitted. Simultaneously set up the bearing body 5 in drive wheel 4 to an anti-conventional design, with external rotor motor 6 integration embedding in the bearing body 5, thereby there is enough space can make the overall structure of bearing body 5 bigger relatively, length also can be done longer, make bearing body 5 and drive wheel 4 between have bigger bearing and area of contact, compare with current bearing structure bearing capacity higher, can satisfy the bearing demand of carrier, consequently, need not to set up the auxiliary stay wheel in addition again for the carrier. Then the operating handle 2 is directly connected with the wheel shaft 3 through the rotating shaft 7, so that the driving wheel 4 can be driven to swing to realize real-time steering, no additional steering bearing wheel is needed, namely, the driving, steering and bearing functions are realized through one driving wheel 4, the structure of the whole vehicle is simplified, the weight of the whole vehicle is reduced, the energy consumption is reduced, the utilization rate of electric energy is improved, and the manufacturing cost is also reduced.

Example two

The structure of the present embodiment is substantially the same as that of the first embodiment, except that: the cycloid pin gear 11a is connected to the output shaft 6c via an eccentric shaft 6 d.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although 1, the frame is used more herein; 2. an operating handle; 3. a wheel axle; 4. a drive wheel; 5. a load bearing body; 6. an outer rotor motor; 6a, a stator; 6b, a rotor; 6c, an output shaft; 6d, an eccentric shaft; 7. a rotating shaft; 7a, a connecting hole; 8. a connecting seat; 9. an electric cabinet; 9a, side plates; 9a1, locating holes; 9a2, wire through hole; 9b, a bottom plate; 9c, a yielding cavity; 10. a first bearing; 11. a speed reducer; 11a, a cycloidal pin wheel; 11b, a needle gear ring; 11c, needle tooth roller pins; 12. a second bearing; 13. a torsion connecting sheet; 14. a third bearing; 15. a pallet fork; 16. a driven wheel; 17. jack, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The electric carrier comprises a frame (1), an operating handle (2), a wheel shaft (3) and driving wheels (4) rotatably connected to two ends of the wheel shaft (3), and is characterized in that bearing bodies (5) are rotatably connected to the driving wheels (4), the wheel shaft (3) is fixed to the bearing bodies (5), an outer rotor motor (6) is arranged in each bearing body (5) and can drive the driving wheels (4) to rotate relative to the bearing bodies (5), and the operating handle (2) is connected with the wheel shaft (3) and can drive the wheel shaft (3) to swing.

2. The electric truck according to claim 1, wherein a rotating shaft (7) is rotatably connected to the frame (1) in a vertical direction, one end of the rotating shaft (7) is fixedly connected to the wheel shaft (3), the other end of the rotating shaft is fixedly connected to the connecting seat (8), the operating handle (2) is connected to the connecting seat (8), and the operating handle (2) is vertically offset from the rotating shaft (7).

3. The electric cart according to claim 2, further comprising a power source and a driver for controlling the operation of said external rotor motor (6), said power source and driver being electrically connected to said external rotor motor (6), said power source and driver being disposed between said two drive wheels (4) and fixed to said axle (3).

4. The electric truck as claimed in claim 3, wherein the power source and the driver are integrally fixed in an electric cabinet (9), one end of the rotating shaft (7) is located between the two driving wheels (4) and is provided with a connecting hole (7a) passing through the end in a radial direction, the wheel shaft (3) passes through the connecting hole (7a), two connecting plates (9a) extend outwards from the electric cabinet (9), the two connecting plates (9a) are arranged near two sides of the electric cabinet (9), both connecting plates (9a) are provided with positioning holes (9a1), the wheel shaft (3) passes through the two positioning holes (9a1) and the two connecting plates (9a) are respectively located at two sides of the rotating shaft (7).

5. The electric truck according to claim 4, wherein a bottom plate (9b) extends from the bottom of the electric cabinet (9), a yielding cavity (9c) is defined between the bottom plate (9b) and the two connecting plates (9a), the pivot shaft (7) extends into the yielding cavity (9c) and a gap is formed between the end surface of the pivot shaft (7) and the bottom plate (9b), and both the two connecting plates (9a) are further provided with a wire passing hole (9a2) communicated with the yielding cavity (9 c).

6. The electric carrier according to any one of claims 1 to 5, wherein the bearing body (5) is cylindrical, a first bearing (10) is fixedly sleeved outside the bearing body (5), an outer ring of the first bearing (10) is tightly fitted and connected with an inner circumferential wall of the driving wheel (4), the wheel shaft (3) is fixedly arranged on the bearing body (5) in a penetrating manner, an end portion of the wheel shaft penetrates through the bearing body (5) to be fixedly connected with the outer rotor motor (6), an output shaft (6c) of the outer rotor motor (6) extends out of the bearing body (5) to be connected with a speed reducer (11), and the speed reducer (11) is connected with the driving wheel (4).

7. The electric cart according to claim 6, wherein said external rotor motor (6) comprises a stator (6a) and a rotor (6b) rotatable relative to the stator (6a), said stator (6a) and rotor (6b) are both disposed in the load bearing body (5), one end of said wheel shaft (3) penetrates into the load bearing body (5) and is fixedly connected with said stator (6a), said rotor (6b) has said output shaft (6c), and a gap is provided between said rotor (6b) and the inner wall of the load bearing body (5).

8. The electric cart according to claim 7, wherein said speed reducer (11) comprises a cycloidal pin gear (11a) and a ring-shaped pin gear ring (11b), said pin gear ring (11b) is fixed on the load-bearing body (5), said pin gear ring (11b) has a plurality of pin needles (11c) disposed on an inner wall thereof along a circumferential direction, said cycloidal pin gear (11a) is inserted into said pin gear ring (11b) and engaged with said pin needles (11c), said cycloidal pin gear (11a) is rotatably connected to said output shaft (6c) and eccentrically disposed with respect to said output shaft (6c), and said cycloidal pin gear (11a) is fixedly connected to said driving wheel (4).

9. The electric cart according to claim 8, wherein an eccentric shaft (6d) is connected to said output shaft (6c), and said hypocycloidal pin gear (11a) is connected to said eccentric shaft (6d) through a second bearing (12).

10. The electric truck as claimed in claim 9, characterized in that a torque connection piece (13) is further provided in the drive wheel (4), one connection plate (9a) of the torque connection piece (13) is fixed to the hypocycloidal pin wheel (11a) by a connection column, and the other connection plate (9a) is abutted against the inner wall of the drive wheel (4) and fixed to the drive wheel (4).