Electric transport vehicle

Abstract

The present invention provides an electric transport vehicle, which belongs to the field of mechanical technology. It solves the problems of complex structure and high energy consumption of existing electric transport vehicles. The electric transport vehicle includes a frame, an operating handle, a wheel axle, and a driving wheel rotatably connected to both ends of the wheel axle, the driving wheel is rotatably connected to a load-bearing body, the wheel axle is fixed on the load-bearing body, the load-bearing body is built with an outer rotor motor, and the outer rotor motor can drive the driving wheel to rotate relative to the load-bearing body, and the operating handle is connected to the wheel axle and can drive the wheel axle to swing. The driving wheel of the transport vehicle has the functions of driving, steering and bearing weight at the same time, eliminating the transmission mechanism between the motor and the driving wheel, the auxiliary support wheel for bearing weight, and the steering load-bearing wheel for steering, and the structure is simpler and lighter, which reduces energy consumption and improves the utilization rate of electric energy.

Description

Technical Field

[0001] The invention belongs to the technical field of machinery and relates to an electric transport vehicle. Background Art

[0002] In logistics and warehousing operations, traditional manual handling has been generally replaced by mechanical handling due to various reasons such as high work intensity and low work efficiency. Existing transporters are mainly divided into manual transporters and electric transporters. Electric transporters have been widely used because they can save a lot of manpower and improve work efficiency during the consignment process. Electric transporters are generally divided into single-drive wheel transporters and dual-drive wheel transporters. Dual-drive wheel transporters are more stable than single-drive wheel transporters.

[0003] For example, a Chinese patent application (application number: 201610126238.8) discloses a small turning radius electric pallet truck structure, which includes a body, a pallet rack mounted on the body, and a lifting device for lifting the pallet rack on the body, and also includes an operating device for controlling steering, the operating device includes a driving wheel and a handle, the pallet rack is connected with walking load-bearing wheels with adjustable height above the ground and steering load-bearing wheels with adjustable height above the ground, the wheel axis direction of the steering load-bearing wheel forms an angle α with the forward direction of the body, α is an acute angle, and also includes auxiliary support wheels for auxiliary support and auxiliary steering, the auxiliary support wheels are universal wheels.

[0004] In the existing electric transporter as mentioned above, the two driving wheels are connected to the two ends of the wheel axle through bearings, and the electric transporter is used to transport several tons of heavy objects. The bearing load on the driving wheel alone cannot meet the demand, so it is necessary to set up an additional auxiliary support wheel. At the same time, the two driving wheels are driven by two motors respectively, and the driving wheels and the motors are connected by belts or chains, and the motors are powered by the battery box on the frame. Due to the limitations of the transmission structure such as belts and chains and the limitations of the lines between the battery box and the motor, the driving wheels can only provide the driving force for operation. If you want to achieve steering, it is achieved by the additionally set steering load-bearing wheels. In order to avoid the mutual interference between the walking load-bearing wheels and the steering load-bearing wheels, the two need to alternately land on the ground to complete the corresponding functions. Therefore, it is also necessary to set up a lifting structure, which leads to the structure of the entire transporter being more complicated, increasing the weight of the whole vehicle, increasing energy consumption, and reducing the utilization rate of electric energy. In addition, if the above-mentioned transporter needs to turn during the transporting process, it is necessary to stop the moving transporter first, then control the walking load-bearing wheels to rise off the ground, the steering load-bearing wheels to drop to the ground, and then turn. After completing the turn, in order not to interfere with the forward direction, the transporter needs to be stopped, and the walking load-bearing wheels are controlled to touch the ground, while the steering load-bearing wheels are raised and do not touch the ground. The operation process is complicated and inconvenient, and the turning can only be performed at a fixed angle, which makes it even less convenient to use. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to propose an electric transport vehicle. The technical problem to be solved by the present invention is: how to solve the problem of excessive energy consumption caused by complex structure.

[0006] The objectives of the present invention can be achieved through the following technical solutions: an electric transport vehicle, comprising a frame, an operating handle, a wheel axle and drive wheels rotatably connected to both ends of the wheel axle, characterized in that a load-bearing body is rotatably connected to the drive wheel, the wheel axle is fixed on the load-bearing body, the load-bearing body is equipped with an outer rotor motor and the outer rotor motor can drive the drive wheel to rotate relative to the load-bearing body, the operating handle is connected to the wheel axle and can drive the wheel axle to swing.

[0007] The electric transport vehicle has improved the design of the driving structure of the driving wheel, and the driving source for controlling the rotation of the driving wheel is directly built into the driving wheel in the form of an outer rotor motor, eliminating the transmission mechanism between the motor and the driving wheel, simplifying the structure. In addition, a load-bearing body is set in the driving wheel, and the outer rotor motor is integrated and embedded in the load-bearing body in an unconventional design, so that there is enough space to make the overall structure of the load-bearing body relatively larger, and the length can also be made longer, so that there is a larger support and contact area between the load-bearing body and the driving wheel. Compared with the existing bearing structure, the bearing capacity is higher and can meet the load-bearing requirements of the transport vehicle. Therefore, there is no need to set up additional auxiliary support wheels on the transport vehicle, which further simplifies the structure. At the same time, the operating handle is directly connected to the wheel axle, and the wheel axle can be driven to swing synchronously by controlling the operating handle to drive the rotating shaft to rotate, thereby driving the driving wheel to swing and realize real-time steering, that is, the driving wheel has a steering function, and there is no need to set up additional steering load-bearing wheels, which further simplifies the structure. That is to say, the above structural improvement and simplification of the electric transport vehicle enables the driving wheel to have the functions of driving, steering and bearing at the same time, reducing the weight of the vehicle, reducing energy consumption, improving the utilization rate of electric energy, and reducing the manufacturing cost. At the same time, during transportation, the real-time steering of the transport vehicle can be achieved by controlling the swing of the operating handle, which is easier to operate, and the swing amplitude of the operating handle can be controlled to achieve steering at different angles, which is more convenient to use.

[0008] In the above-mentioned electric transport vehicle, a rotating shaft is connected to the frame in a vertical direction, one end of the rotating shaft is fixedly connected to the wheel axle, and the other end is fixedly connected to a connecting seat, and the operating handle is connected to the connecting seat, and the operating handle and the rotating shaft are staggered in the vertical direction. Through the above-mentioned setting, the operating handle and the rotating shaft are distributed in a Z shape, and the rotating shaft can be driven to rotate by swinging the handle, thereby driving the wheel axle to swing and realize the steering of the driving wheel. There is no need to set up an additional steering load-bearing wheel, which further simplifies the structure, reduces the weight of the whole vehicle, improves the utilization rate of electric energy, and reduces the production cost. At the same time, through the above-mentioned setting, the principle of the lever is well utilized, making the operation more convenient and labor-saving.

[0009] In the above-mentioned electric transport vehicle, the transport vehicle also 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 the power supply and the driver are both arranged between the two driving wheels and fixed to the wheel axle. The driver can synchronously drive the two outer rotor motors to work when the transport vehicle is moving straight, thereby realizing synchronous driving of the two driving wheels. When turning, the angle sensor in the driver can control the rotation speed of the two outer rotor motors respectively, thereby realizing differential driving of the two driving wheels. When stopping or braking suddenly, the outer rotor motor can be locked, thereby improving the controllability and safety of the transport vehicle during movement. The power supply and the driver are both fixed on the axle between the two driving wheels, so that the driving wheel, the driver and the battery are in the same rotation plane. When the driving wheel turns, the driver and the battery can turn synchronously, that is, during the turning process, the relative position between the driving wheel, the driver and the battery is unchanged, thereby ensuring that the wires connected to each other will not be twisted and deformed to cause damage and breakage, and at the same time, the installation space of the battery and the driver on the frame is saved, further simplifying the body structure, improving the utilization rate of electric energy, and reducing the cost.

[0010] In the above-mentioned electric transport vehicle, the power supply and the driver are integrated and fixed in the electric control box, one end of the rotating shaft is located between the two driving wheels and a radially penetrating connecting hole is provided at the end, the wheel axle passes through the connecting hole, two connecting plates extend outward from the electric control box, the two connecting plates are arranged near the two sides of the electric control box, positioning holes are provided on the two connecting plates, the wheel axle passes through the two positioning holes and the two connecting plates are respectively located on the two sides of the rotating shaft. Through the above-mentioned arrangement, the space between the two driving wheels is reasonably utilized, and the battery and the driver are integrated and installed on the wheel axle there. During the steering process, the relative positions between the driving wheels, the driver and the battery remain unchanged, thereby ensuring that the wires connecting them to each other will not be twisted and deformed to cause damage and breakage, and at the same time, the installation space of the battery and the driver on the frame is saved, further simplifying the body structure, improving the utilization rate of electric energy and reducing the cost.

[0011] In the above-mentioned electric transport vehicle, a bottom plate extends from the bottom of the electric control box, and a clearance cavity is formed between the bottom plate and the two connecting plates. The rotating shaft extends into the clearance cavity, and there is a gap between the end face of the rotating shaft and the bottom plate. Both connecting plates are also provided with wire holes connected to the clearance cavity. The clearance cavity can be used for placing wires and other wiring harnesses, and the provision of the wire holes facilitates the wires to pass through the wire holes into the driving wheel to achieve electrical connection with the outer rotor motor.

[0012] In the above-mentioned electric transport vehicle, the load-bearing body is cylindrical, and a bearing 1 is fixedly sleeved outside the load-bearing body. The outer ring of the bearing 1 is tightly connected with the inner peripheral wall of the driving wheel. The wheel axle is fixedly penetrated on the load-bearing body and the end thereof penetrates into the load-bearing body and is fixedly connected with the outer rotor motor. The output shaft of the outer rotor motor extends out of the load-bearing body and is connected with a reducer, and the reducer is connected with the driving wheel. The load-bearing body is connected with the inner wall of the driving wheel through a bearing 1, thereby ensuring that the rotation of the rotor can drive the driving wheel to rotate relative to the load-bearing body. The load-bearing body improves the load-bearing capacity of the entire driving wheel, so that the driving wheel has the function of bearing weight, and there is no need to set up an additional auxiliary support wheel, which simplifies the structure and improves the utilization rate of electric energy.

[0013] Preferably, there are two bearings 1, which are arranged at intervals and fixedly sleeved at both ends of the load-bearing body. By arranging bearings 1 at both ends of the load-bearing body, it is possible to ensure that the force is dispersed, so that the whole has a good load-bearing capacity. At the same time, the two bearings 1 are arranged at intervals, and the inner ring is tightly matched with the load-bearing body, and the outer ring is tightly matched with the inner wall of the driving wheel, which is equivalent to forming a reinforced cavity structure between the two bearings 1, further improving the overall load-bearing capacity of the driving wheel.

[0014] In the above-mentioned electric transport vehicle, the outer rotor motor includes a stator and a rotor that can rotate relative to the stator. The stator and the rotor are both arranged in the load-bearing body. One end of the wheel axle penetrates into the load-bearing body and is fixedly connected to the stator. The rotor has the above-mentioned output shaft, and there is a gap between the rotor and the inner wall of the load-bearing body. The stator and the rotor are both located in the load-bearing body, and the stator is fixed on the wheel axle. There is a gap between the rotor and the inner wall of the load-bearing body, which is equivalent to the entire outer rotor motor being fixed on the wheel axle and suspended in the load-bearing body. The outer rotor motor does not bear any load-bearing force and is not easy to be damaged. Moreover, the outer rotor motor is not subject to load-bearing force, which can ensure smooth driving of the driving wheel and improve the utilization rate of electric energy.

[0015] In the above-mentioned electric transport vehicle, the reducer includes a cycloidal pinwheel and a ring-shaped needle gear ring, the needle gear ring is fixed on the load-bearing body, and a plurality of needle gear rollers are circumferentially arranged on the inner wall of the needle gear ring, the cycloidal pinwheel is inserted into the needle gear ring and cooperates with the needle gear rollers, the cycloidal pinwheel is rotatably connected to the output shaft and is eccentrically arranged relative to the output shaft, and the cycloidal pinwheel is fixedly connected to the driving wheel. The reducer adopts a cycloidal pinwheel reducer, which has the advantages of large reduction ratio, high transmission efficiency, small size, light weight, few failures, long life, stable and reliable operation, low noise, convenient disassembly and assembly, easy maintenance, simple structure, strong overload capacity, impact resistance, small inertia moment, etc., compared with existing planetary gear reducers. Moreover, because the cycloid pinwheel reducer is small in size and light in weight, the installation space it occupies in the drive wheel is also small, which provides a larger installation space for the load-bearing body, so that the overall structure of the load-bearing body can be made relatively larger, the length can be made longer, and the load-bearing capacity can be higher.

[0016] In the above-mentioned electric transport vehicle, the output shaft is connected to an eccentric shaft, and the cycloidal pinwheel is connected to the eccentric shaft through bearing 2. Through the above-mentioned design, when the output shaft of the outer rotor motor rotates one circle, the cycloidal pinwheel installed on the eccentric shaft and bearing 2 also revolves one circle, and at the same time, it also rotates by one tooth angle, so the driving wheel connected to the cycloidal pinwheel also rotates by one tooth angle, so that the rotation of the outer rotor motor can drive the driving wheel to rotate and reduce speed. As an alternative, the cycloidal pinwheel is connected to the output shaft through an eccentric bearing.

[0017] In the above-mentioned electric transport vehicle, a torsion connecting plate is further provided in the driving wheel, one side of the torsion connecting plate is fixed to the cycloid pinwheel through a connecting column, and the other side of the torsion connecting plate is abutted against the inner wall of the driving wheel and fixed to the driving wheel. The torsion connecting plate is used to transmit output torque, so that the outer rotor motor can drive the driving wheel to rotate.

[0018] Compared with the prior art, this electric transport vehicle has the following advantages:

[0019] 1. The driving wheel has the functions of driving, steering and load-bearing at the same time, eliminating the transmission mechanism between the motor and the driving wheel, the auxiliary support wheel for load-bearing, and the steering load-bearing wheel for steering. The structure is simpler and lighter, which reduces energy consumption and improves the utilization rate of electric energy.

[0020] 2. When transporting, you only need to control the swing of the operating handle to achieve real-time steering of the transport truck, and controlling the swing amplitude of the operating handle can achieve steering at different angles, making operation and use more convenient.

[0021] 3. The power supply and driver are fixed on the axle between the two driving wheels, so that the driving wheel, driver and battery are in the same rotation plane. During the steering process, the relative positions between the driving wheel, driver and battery remain unchanged, thereby ensuring that the wires connecting them will not be twisted and deformed, resulting in damage and breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the electric transport vehicle.

[0023] Figure 2 This is a three-dimensional diagram of the electric transport vehicle without the electric control box.

[0024] Figure 3 It is a three-dimensional diagram of the electric transport vehicle without the electric control box and the driving wheels.

[0025] Figure 4 This is an exploded view of the drive wheel.

[0026] Figure 5 It is a cross-sectional view of the driving wheel.

[0027] Figure 6 It is a three-dimensional diagram of the rotor.

[0028] Figure 7 It is a three-dimensional diagram of the electric control box.

[0029] In the figure, 1, frame; 2, operating handle; 3, wheel axle; 4, driving wheel; 5, load-bearing body; 6, outer rotor motor; 6a, stator; 6b, rotor; 6c, output shaft; 6d, eccentric shaft; 7, rotary shaft; 7a, connecting hole; 8, connecting seat; 9, electric control box; 9a, connecting plate; 9a1, positioning hole; 9a2, wire hole; 9b, bottom plate; 9c, clearance cavity; 10, bearing one; 11, reducer; 11a, cycloid pinwheel; 11b, needle gear ring; 11c, needle gear roller; 12, bearing two; 13, torque connecting plate; 14, bearing three; 15, fork; 16, driven wheel; 17, lifter. DETAILED DESCRIPTION

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0031] Embodiment 1

[0032] like Figure 1-3As shown, the electric transport vehicle includes a frame 1, an operating handle 2, two forks 15, a lifter 17 that can drive the two forks 15 to swing up and down to achieve lifting, an axle 3, and a driving wheel 4 rotatably connected to both ends of the axle 3. Both forks 15 are provided with driven wheels 16, which can rotate synchronously under the drive of the driving wheel 4. A rotating shaft 7 is rotatably connected to the frame 1 in the vertical direction, and a connecting seat 8 is fixedly connected to one end of the rotating shaft 7. In this embodiment, the lifter 17 is a manual jack, and the operating handle 2 is hinged to the connecting seat 8 through an articulated shaft. A return spring is also provided between the operating handle 2 and the connecting seat 8. Pulling the operating handle 2 up and down can control the manual jack to lift the two forks 15 to achieve lifting. Of course, as an alternative, the lifter 17 can also be an electric hydraulic jack or an electric screw jack.

[0033] The other end of the rotating shaft 7 is located between the two driving wheels 4 and is provided with a radially penetrating connecting hole 7a. The wheel axle 3 passes through the connecting hole 7a. The operating handle 2 and the rotating shaft 7 are staggered in the vertical direction, that is, the operating handle 2 and the rotating shaft 7 are distributed in a Z shape. By swinging the handle in the horizontal direction, the rotating shaft 7 can be driven to rotate through the principle of leverage, thereby driving the wheel axle 3 to swing.

[0034] Specifically, if Figure 4-6 As shown, a load-bearing body 5 is rotatably connected inside the driving wheel 4, and the load-bearing body 5 is cylindrical. A bearing 10 is fixedly sleeved outside the load-bearing body 5. There are two bearings 10, which are arranged at intervals and fixedly sleeved at both ends of the load-bearing body 5. The outer ring of the bearing 10 is tightly fitted with the inner circumferential wall of the driving wheel 4, which is equivalent to forming a reinforced cavity structure between the two bearings 10.

[0035] The load-bearing body 5 is equipped with an outer rotor motor 6, which includes a stator 6a and a rotor 6b. The rotor 6b is cylindrical, and the stator 6a is arranged inside the rotor 6b. The wheel shaft 3 is fixedly penetrated on the load-bearing body 5, and the end thereof penetrates the load-bearing body 5 and is fixedly connected with the stator 6a. The rotor 6b is connected to the wheel shaft 3 through the bearing 3 14, and there is a gap between the rotor 6b and the inner wall of the load-bearing body 5. The rotor 6b is provided with an output shaft 6c, and the output shaft 6c extends out of the load-bearing body 5 and is connected with a reducer 11. In this embodiment, the reducer 11 adopts a cycloidal pinwheel reducer, which has the advantages of large reduction ratio, high transmission efficiency, small size, light weight, few faults, long life, stable and reliable operation, low noise, convenient disassembly and assembly, easy maintenance, simple structure, strong overload capacity, impact resistance, small inertia moment, etc., so that the overall structure can be simplified, the weight is lighter, and the utilization rate of electric energy is further improved.

[0036] Furthermore, the reducer 11 includes a cycloid pinwheel 11a and a ring-shaped needle gear ring 11b, the needle gear ring 11b is fixed on the load-bearing body 5, and a plurality of needle gear rollers 11c are arranged on the inner wall of the needle gear ring 11b along the circumferential direction, and the cycloid pinwheel 11a is inserted into the needle gear ring 11b and cooperates with the needle gear rollers 11c. The output shaft 6c is connected to the eccentric shaft 6d, and the cycloid pinwheel 11a is connected to the eccentric shaft 6d through the bearing 12. A torsion connecting plate 13 is also arranged in the driving wheel 4, and one side of the torsion connecting plate 13 is fixed to the cycloid pinwheel 11a through a connecting column, and the other side of the plate is abutted against the inner wall of the driving wheel 4 and fixed to the driving wheel 4. When the output shaft 6c of the outer rotor motor 6 rotates one circle, the cycloidal pinwheel 11a installed on the eccentric shaft 6d and the bearing 12 also rotates one circle, and at the same time, it rotates by one tooth angle. Therefore, the driving wheel 4 connected to the cycloidal pinwheel 11a also rotates by one tooth angle. In this way, the rotation of the outer rotor motor 6 can drive the driving wheel 4 to rotate and slow down.

[0037] like Figure 1 and 7 As shown, the transport vehicle also includes a power supply and a driver for controlling the operation of the outer rotor motor 6, and the power supply and the driver are integrated and fixed in the electric control box 9. Two connecting plates 9a extend outward from the electric control box 9, and the two connecting plates 9a are arranged near the two sides of the electric control box 9. Positioning holes 9a1 are provided on the two connecting plates. The wheel axle 3 passes through the two positioning holes 9a1 and the two connecting plates 9a are respectively located on the two sides of the rotary shaft 7. A bottom plate 9b also extends from the bottom of the electric control box 9, and the bottom plate 9b and the two connecting plates 9a are surrounded to form a clearance cavity 9c. The rotary shaft 7 extends into the clearance cavity 9c and there is a gap between the end surface of the rotary shaft 7 and the bottom plate 9b. The two connecting plates 9a are also provided with a wire hole 9a2 connected to the clearance cavity 9c. The driver can synchronously drive the two outer rotor motors 6 to work when the transport vehicle is moving straight, thereby realizing synchronous driving of the two driving wheels 4. When turning, the angle sensor in the driver can control the rotation speed of the two outer rotor motors 6 respectively, thereby realizing differential driving of the two driving wheels 4. When stopping or braking suddenly, the outer rotor motor 6 can be locked, thereby improving the controllability and safety of the transport vehicle during movement. By rationally utilizing the space between the two driving wheels 4, the battery and the driver are integrated and installed on the axle 3 there. During the turning process, the relative positions between the driving wheels 4, the driver and the battery are unchanged, thereby ensuring that the wires connecting them will not be twisted and deformed to cause damage and breakage. At the same time, the installation space of the battery and the driver on the frame 1 is saved, further simplifying the body structure, improving the utilization rate of electric energy, and reducing the cost.

[0038] This electric transport vehicle directly builds the driving source for controlling the rotation of the driving wheel 4 into the driving wheel 4 in the form of an outer rotor motor 6, eliminating the transmission mechanism between the motor and the driving wheel 4. At the same time, a load-bearing body 5 is set in the driving wheel 4, and the outer rotor motor 6 is integrated and embedded in the load-bearing body 5 in an unconventional design, so that there is enough space to make the overall structure of the load-bearing body 5 relatively larger, and the length can also be made longer, so that there is a larger support and contact area between the load-bearing body 5 and the driving wheel 4, and the load-bearing capacity is higher than that of the existing bearing structure, which can meet the load-bearing requirements of the transport vehicle, therefore, there is no need to set up an additional auxiliary support wheel in the transport vehicle. Then the operating handle 2 is directly connected to the wheel axle 3 through the rotating shaft 7, so that the driving wheel 4 can be driven to swing to realize real-time steering, and there is no need to set up a steering load-bearing wheel, that is, the functions of driving, steering and bearing are realized simultaneously through a driving wheel 4, simplifying the structure of the whole vehicle, reducing the weight of the whole vehicle, reducing energy consumption, improving the utilization rate of electric energy, and reducing the cost of production.

[0039] Embodiment 2

[0040] The structure of this embodiment is basically the same as that of the first embodiment, except that the cycloid pinwheel 11a is connected to the output shaft 6c through an eccentric shaft 6d.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0042] Although the following terms are used more frequently in this article, such as 1, frame; 2, operating handle; 3, axle; 4, driving wheel; 5, load-bearing body; 6, outer rotor motor; 6a, stator; 6b, rotor; 6c, output shaft; 6d, eccentric shaft; 7, rotary shaft; 7a, connecting hole; 8, connecting seat; 9, electric control box; 9a, side plate; 9a1, positioning hole; 9a2, wire hole; 9b, bottom plate; 9c, clearance cavity; 10, bearing 1; 11, reducer; 11a, cycloidal pinwheel; 11b, pin gear ring; 11c, pin gear roller; 12, bearing 2; 13, torque connecting plate; 14, bearing 3; 15, fork; 16, driven wheel; 17, jack, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An electric transport vehicle, comprising a vehicle frame (1), an operating handle (2), a wheel axle (3), and drive wheels (4) rotatably connected to both ends of the wheel axle (3), characterized in that: The driving wheel (4) is rotatably connected to a load-bearing body (5), the wheel axle (3) is fixed on the load-bearing body (5), the load-bearing body (5) is internally provided with an outer rotor motor (6), and the outer rotor motor (6) can drive the driving wheel (4) to rotate relative to the load-bearing body (5), and the operating handle (2) is connected to the wheel axle (3) and can drive the wheel axle (3) to swing; the transport vehicle further comprises two forks (15), and a lifting device (17) capable of driving the two forks (15) to swing up and down to achieve lifting, and the two forks (15) are each provided with a driven The wheel (16) can rotate synchronously under the drive of the driving wheel (4); a rotating shaft (7) is rotatably connected to the frame (1) in the vertical direction; one end of the rotating shaft (7) is fixedly connected to the wheel axle (3); and the other end is fixedly connected to a connecting seat (8); the operating handle (2) is connected to the connecting seat (8), and the operating handle (2) and the rotating shaft (7) are staggered in the vertical direction. The transport vehicle also includes a power supply and a driver for controlling the operation of the outer rotor motor (6); the power supply and the driver are connected to the outer rotor motor (6). The power supply and the driver are both arranged between the two driving wheels (4) and fixed to the wheel axle (3); the power supply and the driver are integrated and fixed in an electric control box (9); one end of the rotary shaft (7) is located between the two driving wheels (4) and is provided with a radially penetrating connection hole (7a); the wheel axle (3) passes through the connection hole (7a); two connecting plates (9a) extend outward from the electric control box (9); the two connecting plates (9a) are arranged near two sides of the electric control box (9); and both connecting plates (9a) are provided with fixed The wheel axle (3) passes through the two positioning holes (9a1), and the two connecting plates (9a) are respectively located on both sides of the rotary shaft (7); a bottom plate (9b) extends from the bottom of the electric control box (9); the bottom plate (9b) and the two connecting plates (9a) together form a clearance cavity (9c); the rotary shaft (7) extends into the clearance cavity (9c) and a gap is formed between the end surface of the rotary shaft (7) and the bottom plate (9b); and the two connecting plates (9a) are also provided with a wire hole (9a2) connected to the clearance cavity (9c).

2. The electric transport vehicle according to claim 1, characterized in that: The load-bearing body (5) is cylindrical, and a bearing (10) is fixedly sleeved outside the load-bearing body (5). The outer ring of the bearing (10) is tightly fitted with the inner circumferential wall of the driving wheel (4). The wheel axle (3) is fixedly inserted into the load-bearing body (5) and its end is inserted into the load-bearing body (5) and fixedly connected to the outer rotor motor (6). The output shaft (6c) of the outer rotor motor (6) extends out of the load-bearing body (5) and is connected to a reducer (11). The reducer (11) is connected to the driving wheel (4).

3. The electric transport vehicle according to claim 2, characterized in that: The outer rotor motor (6) comprises a stator (6a) and a rotor (6b) capable of rotating relative to the stator (6a); the stator (6a) and the rotor (6b) are both arranged in a load-bearing body (5); one end of the wheel axle (3) penetrates into the load-bearing body (5) and is fixedly connected to the stator (6a); the rotor (6b) has the above-mentioned output shaft (6c); and a gap is provided between the rotor (6b) and the inner wall of the load-bearing body (5).

4. The electric transport vehicle according to claim 3, characterized in that: The reducer (11) comprises a cycloidal pinwheel (11a) and an annular needle gear ring (11b); the needle gear ring (11b) is fixed on a load-bearing body (5); a plurality of needle gear rollers (11c) are circumferentially arranged on the inner wall of the needle gear ring (11b); the cycloidal pinwheel (11a) is inserted into the needle gear ring (11b) and cooperates with the needle gear rollers (11c); the cycloidal pinwheel (11a) is rotatably connected to the output shaft (6c) and is eccentrically arranged relative to the output shaft (6c); and the cycloidal pinwheel (11a) is fixedly connected to the driving wheel (4).

5. The electric transport vehicle according to claim 4, characterized in that: The output shaft (6c) is connected to an eccentric shaft (6d), and the cycloid pinwheel (11a) is connected to the eccentric shaft (6d) via a second bearing (12).

6. The electric transport vehicle according to claim 5, characterized in that: A torsion connecting plate (13) is also provided in the driving wheel (4); one connecting plate (9a) surface of the torsion connecting plate (13) is fixed to the cycloidal pinwheel (11a) via a connecting column, and the other connecting plate (9a) surface is abutted against the inner wall of the driving wheel (4) and fixed to the driving wheel (4).

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