CN218430837U - Three-level speed reduction driving wheel assembly and electric carrier - Google Patents

Abstract

The utility model discloses a tertiary speed reduction drive wheel assembly and electric pallet truck belongs to the electric pallet truck field. The utility model discloses a drive wheel assembly, which comprises a mounting bas, a wheel, gear reducer and motor, the both sides support arm outside of mount pad is located respectively to gear reducer and motor, gear reducer's output shaft is the hollow shaft, the both ends of output shaft are respectively through bearing support on the both sides support arm of mount pad, the input shaft is worn to be established in the hole of output shaft, the one end and the motor of input shaft are connected, the other end passes through tertiary gear drive and is connected with output shaft transmission, two intermediate drive axles of tertiary gear drive are located the top of input shaft in parallel, and two intermediate drive axles are triangular distribution with the axis of input shaft three. By adopting the design, the longitudinal size of the gear reducer is more compact, the improvement of the trafficability characteristic of the driving wheel is facilitated, the optimization of the transmission ratio is facilitated, a more reasonable reduction transmission ratio can be designed, and the output torque is improved.

Description

Three-level speed reduction driving wheel assembly and electric carrier

Technical Field

The utility model relates to an electric pallet truck's drive wheel, more specifically say, relate to a tertiary speed reduction drive wheel assembly and electric pallet truck.

Background

The electric porter has the characteristics of small turning radius, easy operation and the like. With the continuous expansion of the application field of the electric truck, the electric truck is adopted by most users as a medium-distance and long-distance material transfer device, and is widely applied to places such as logistics storage, workshops, goods yards, shops, supermarkets and the like.

The driving wheel is a core component for the walking of the electric truck, and mainly comprises a mounting seat, wheels, a motor, a speed reducer, a brake and the like, wherein the wheels are arranged on support arms on two sides of the mounting seat, the motor is in transmission connection with the wheels through the speed reducer, and the brake is connected with an output shaft of the motor. Since the mounting space of the drive wheel on the electric truck is limited, the drive wheel is required to be more compact.

Chinese patent application No. 202221692665.x proposes a technical scheme of a compact driving wheel assembly and an electric truck using the same, in which a gear reducer and a motor are respectively arranged at both sides of a mounting seat in the driving wheel assembly, and an input shaft passes through a hollow wheel shaft to realize transmission connection between the motor and the gear reducer, thereby further improving the structural compactness of the driving wheel. However, the technical scheme of the patent application adopts two-stage gear transmission, and in order to achieve a set transmission ratio, the size of a transmission gear wheel needs to be larger, so that the size of a gear box is larger, especially the distance from the bottom of the gear box to the ground contact position of a wheel is smaller, and the driving wheel cannot pass through the gear box in some use scenes. In addition, although the patent application also mentions that the reduction gear set can be designed with a two-stage or three-stage gear reduction, the three-stage gear reduction needs to take into consideration the layout relationship and the assembly relationship of the respective transmission shafts. Therefore, in order to further optimize the above driving wheel assembly, further improvement thereof is necessary.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model aims to overcome the above-mentioned not enough that current drive wheel assembly exists, provide a tertiary speed reduction drive wheel assembly and electric pallet truck, adopt the technical scheme of the utility model, set up gear reducer and motor respectively in the both sides of mount pad, the input shaft passes hollow output shaft and realizes that the motor is connected with gear reducer's transmission, and gear reducer adopts tertiary gear reduction design simultaneously for gear reducer's vertical size is compacter, is favorable to optimizing drive ratio, improves drive wheel output torque.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a tertiary speed reduction drive wheel assembly, including mount pad, wheel, gear reducer and motor, gear reducer locates the one side support arm outside of mount pad, the motor is located the opposite side support arm outside of mount pad, gear reducer includes gear box, input shaft, tertiary gear drive mechanism and output shaft, the output shaft is the hollow shaft, and the both ends of output shaft are supported on the both sides support arm of mount pad through the bearing respectively, the wheel is located between the both sides support arm of mount pad to coaxial arrangement is on the output shaft, the input shaft wears to be established in the hole of output shaft, the one end of input shaft is connected with the motor, and the other end passes through the tertiary gear drive mechanism in the gear box and is connected with output shaft transmission; the three-stage gear transmission mechanism is provided with two middle transmission shafts, the two middle transmission shafts are parallelly arranged above the input shaft, and the axes of the two middle transmission shafts and the input shaft are distributed in a triangular shape.

Furthermore, a hollow wheel shaft is mounted at the center of the wheel, a first internal spline is arranged on the inner hole wall of the wheel shaft, a first external spline is arranged on the output shaft, and the wheel shaft is mounted on the output shaft through the first internal spline and the first external spline.

Further, tertiary gear drive includes one-level transmission pinion, first middle transmission shaft, one-level transmission gear wheel, second level transmission pinion, second middle transmission shaft, second level transmission gear wheel, tertiary transmission pinion and tertiary transmission gear wheel, one-level transmission pinion locates on the input shaft, transmission shaft is in the gear box through the bearing support respectively in the middle of first middle transmission shaft and the second, one-level transmission gear wheel and second level transmission pinion coaxial arrangement are on first middle transmission shaft, second level transmission gear wheel and tertiary transmission pinion coaxial arrangement are on the transmission shaft in the middle of the second, tertiary transmission gear wheel is installed on the output shaft, one-level transmission pinion meshes with one-level transmission gear wheel mutually, second level transmission pinion meshes with second level transmission gear wheel mutually, tertiary transmission pinion meshes with tertiary transmission gear wheel mutually.

Furthermore, one end of the output shaft, which is positioned in the gear box, is provided with a second external spline, a second internal spline is arranged in a central hole of the third-stage transmission gear wheel, and the third-stage transmission gear wheel is arranged on the output shaft through the second internal spline and the second external spline.

Furthermore, the first-stage drive pinion is integrally formed on the input shaft, the second-stage drive pinion is integrally formed on the first intermediate drive shaft, and the third-stage drive pinion is integrally formed on the second intermediate drive shaft; the first-stage transmission gear wheel is in key connection with the first intermediate transmission shaft, and the second-stage transmission gear wheel is in key connection with the second intermediate transmission shaft.

Furthermore, the gear box comprises a box body and a box cover, and the box cover, the box body and a support arm on one side of the mounting seat are fixedly connected together through bolts in sequence; and a bearing seat is arranged on the supporting arm at one side of the mounting seat close to the motor, and the motor is arranged on the bearing seat.

Further, the outer diameter of the wheel is 300-400 mm.

Furthermore, the brake is arranged on a gear box of the gear reducer and connected with one end, extending out of the gear box, of the input shaft, and is used for applying braking force to the input shaft.

Further, the brake is an electromagnetic brake.

The utility model discloses an electric truck, this electric truck's drive wheel adopt foretell tertiary speed reduction drive wheel assembly.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:

(1) The utility model discloses a tertiary speed reduction drive wheel assembly, it includes the mount pad, a wheel, gear reducer and motor, gear reducer locates the one side support arm outside of mount pad, the motor is located the opposite side support arm outside of mount pad, its gear reducer's output shaft is the hollow shaft, the both ends of output shaft are respectively through bearing support on the both sides support arm of mount pad, the input shaft wears to be established in the hole of output shaft, the one end of input shaft is connected with the motor, the other end passes through tertiary gear drive mechanism in the gear box and is connected with output shaft transmission, tertiary gear drive mechanism has two intermediate drive shafts, two intermediate drive shafts lie in parallel in the top of input shaft, and two intermediate drive shafts are triangle-shaped with the axis of input shaft three and distribute, adopt above-mentioned design, make gear reducer's longitudinal dimension compacter, can increase gear reducer's terrain clearance, help improving the trafficability of drive wheel, and tertiary gear drive mechanism design is favorable to optimizing drive ratio, can design more reasonable speed reduction drive ratio, improve drive wheel output torque;

(2) The wheel shaft of the wheel of the three-level speed reduction driving wheel assembly is connected with the output shaft by adopting a spline structure, so that the three-level speed reduction driving wheel assembly is convenient to assemble, and the axial torque transmission is stable and reliable;

(3) The three-stage speed reduction driving wheel assembly of the utility model has compact structure of the three-stage gear transmission mechanism, stable transmission and high transmission efficiency; in addition, the three-stage transmission large gear is connected with the output shaft through a spline, so that larger torque can be transmitted;

(4) The utility model discloses a three-level speed reduction driving wheel assembly, the gear box of which comprises a box body and a box cover, the box body and a side support arm of a mounting seat are fixedly connected together through bolts; a bearing seat is arranged on the support arm at one side of the mounting seat close to the motor, and the motor is arranged on the bearing seat; by adopting the assembly structure, the processing and the manufacturing of each part are convenient, and the structure is firm and stable after the assembly;

(5) The utility model discloses a tertiary speed reduction drive wheel assembly, it still includes the stopper, and the stopper direct action is on the input shaft, and the braking is more reliable and more stable, can effectively improve the safety in utilization of drive wheel assembly;

(6) The utility model discloses an electric pallet truck, this electric pallet truck's drive wheel adopt foretell tertiary speed reduction drive wheel assembly, because drive wheel assembly compact structure, occupation space is little, consequently can guarantee that the drive wheel turns to nimble convenience on electric pallet truck, improves electric pallet truck's bearing capacity, reduces electric pallet truck's manufacturing cost.

Drawings

Fig. 1 is a schematic view of an angular three-dimensional structure of a three-stage deceleration driving wheel assembly of the present invention;

fig. 2 is another perspective view of the three-stage deceleration driving wheel assembly of the present invention;

FIG. 3 is a schematic cross-sectional view of the three-stage deceleration driving wheel assembly of the present invention;

fig. 4 is a perspective view of the three-stage deceleration driving wheel assembly of the utility model in a disassembled state;

fig. 5 is a schematic view of the split structure of the three-stage gear transmission mechanism in the three-stage reduction driving wheel assembly of the present invention.

The reference numerals in the schematic drawings illustrate:

1. a mounting seat; 1-1, a support arm; 1-2, bearing seats; 2. a wheel; 2-1, wheel axle; 2-1-1, a first internal spline; 3. a gear reducer; 3-1, a box body; 3-2, a box cover; 3-3, an input shaft; 3-4, a three-stage gear transmission mechanism; 3-4-1, a primary drive pinion; 3-4-2, a first intermediate transmission shaft; 3-4-3, a primary transmission gear wheel; 3-4-4, a secondary drive pinion; 3-4-5, a second intermediate transmission shaft; 3-4-6, a secondary transmission big gear; 3-4-7, three-stage transmission pinion; 3-4-8, three-stage driving big gear; 3-4-8a, a second internal spline; 3-5, an output shaft; 3-5-1, a first external spline; 3-5-2, a second male spline; 4. a brake; 5. an electric motor.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

[ examples ]

Referring to fig. 1 to 5, the three-level speed reduction driving wheel assembly of the present embodiment includes a mounting base 1, a wheel 2, a gear reducer 3 and a motor 5, the mounting base 1 has two support arms 1-1, which are integrally in an inverted U-shaped structure, the gear reducer 3 is disposed on the outer side of the support arm 1-1 on one side of the mounting base 1, the motor 5 is disposed on the outer side of the support arm 1-1 on the other side of the mounting base 1, and the gear reducer 3 and the motor 5 are disposed on two sides of the wheel 2, so that the driving wheel is more compact and reasonable in layout, the two sides of the wheel 2 are close in size, and the steering movement of the driving wheel is more facilitated. The gear reducer 3 comprises a gear box, an input shaft 3-3, a three-level gear transmission mechanism 3-4 and an output shaft 3-5, wherein the output shaft 3-5 is a hollow shaft, two ends of the output shaft 3-5 are respectively supported on support arms 1-1 on two sides of the mounting base 1 through bearings, the wheel 2 is positioned between the support arms 1-1 on two sides of the mounting base 1 and is coaxially mounted on the output shaft 3-5, and the output shaft 3-5 directly drives the wheel 2 to rotate. The input shaft 3-3 is arranged in an inner hole of the output shaft 3-5 in a penetrating mode and can rotate relatively, one end of the input shaft 3-3 is connected with the motor 5, the other end of the input shaft is in transmission connection with the output shaft 3-5 through a three-stage gear transmission mechanism 3-4 in the gear box, the rotating speed and the torque output by the motor 5 are transmitted to the gear reducer 3 through the input shaft 3-3, and are transmitted to the wheel 2 through the input shaft 3-3 after being reduced and torque-increased by the three-stage gear transmission mechanism 3-4. The three-stage gear transmission mechanism 3-4 is provided with two intermediate transmission shafts, the two intermediate transmission shafts are parallelly arranged above the input shaft 3-3, and the axes of the two intermediate transmission shafts and the input shaft 3-3 are distributed in a triangular shape, so that the three-stage gear transmission mechanism 3-4 is compact in structure, especially the longitudinal size of the gear reducer is more compact, the ground clearance of the gear reducer can be increased, the passing performance of a driving wheel is improved, the design of the three-stage gear transmission mechanism is favorable for optimizing the transmission ratio, a more reasonable reduction transmission ratio can be designed, and the output torque of the driving wheel is improved.

As shown in fig. 4, in this embodiment, a hollow wheel shaft 2-1 is installed at the center of the wheel 2, the wheel shaft 2-1 may be connected to the wheel 2 by using a flange structure, a first internal spline 2-1-1 is provided on an inner hole wall of the wheel shaft 2-1, a first external spline 3-5-1 is provided on the output shaft 3-5, and the wheel shaft 2-1 is installed on the output shaft 3-5 through the first internal spline 2-1-1 and the first external spline 3-5-1. By adopting the spline connection structure, the assembly of the output shaft 3-5 and the wheel shaft 2-1 is convenient, and the axial torque transmission is stable and reliable. In the present embodiment, the outer diameter of the wheel 2 is 300 to 400mm, and a 350mm wheel 2 is preferably used.

Referring to fig. 4 and 5, the three-stage gear transmission mechanism 3-4 includes a first-stage transmission pinion 3-4-1, a first intermediate transmission shaft 3-4-2, a first-stage transmission gearwheel 3-4-3, a second-stage transmission pinion 3-4-4, a second intermediate transmission shaft 3-4-5, a second-stage transmission gearwheel 3-4-6, a third-stage transmission pinion 3-4-7 and a third-stage transmission gearwheel 3-4-8, the first-stage transmission pinion 3-4-1 is disposed on the input shaft 3-3, the first intermediate transmission shaft 3-4-2 and the second intermediate transmission shaft 3-4-5 are respectively supported in a gear box through bearings, the first-stage transmission gear wheel 3-4-3 and the second-stage transmission pinion 3-4-4 are coaxially arranged on the first middle transmission shaft 3-4-2, the second-stage transmission gear wheel 3-4-6 and the third-stage transmission pinion 3-4-7 are coaxially arranged on the second middle transmission shaft 3-4-5, the third-stage transmission gear wheel 3-4-8 is arranged on the output shaft 3-5, the first-stage transmission pinion 3-4-1 is meshed with the first-stage transmission gear wheel 3-4-3, the second-stage transmission pinion 3-4-4 is meshed with the second-stage transmission gear wheel 3-4-6, and the third-stage transmission pinion 3-4-7 is meshed with the third-stage transmission gear wheel 3-4-8. By adopting the three-stage gear transmission mechanism 3-4, the transmission is stable and the transmission efficiency is high; and, the three-stage gear transmission mechanism 3-4 can obtain larger transmission ratio under the condition of using smaller gears, such as the transmission ratio can be designed to be 1. Furthermore, one end of the output shaft 3-5, which is positioned in the gear box, is provided with a second external spline 3-5-2, a second internal spline 3-4-8a is arranged in a central hole of the third-stage transmission large gear 3-4-8, and the third-stage transmission large gear 3-4-8 is arranged on the output shaft 3-5 through the second internal spline 3-4-8a and the second external spline 3-5-2. The three-stage transmission big gear 3-4-8 and the output shaft 3-5 are also connected by a spline, which is beneficial to transmitting and bearing larger torque. The primary transmission pinion 3-4-1 is integrally formed on the input shaft 3-3, the secondary transmission pinion 3-4-4 is integrally formed on the first intermediate transmission shaft 3-4-2, the tertiary transmission pinion 3-4-7 is integrally formed on the second intermediate transmission shaft 3-4-5, and the structural strength of the gear can be improved by adopting an integral gear shaft; the primary transmission big gear 3-4-3 is connected with the first intermediate transmission shaft 3-4-2 through a key, and the secondary transmission big gear 3-4-6 is connected with the second intermediate transmission shaft 3-4-5 through a key, so that the connection is convenient and the transmission is stable. The first-stage transmission gear, the second-stage transmission gear and the third-stage transmission gear are all bevel gears, and the bevel gears have the advantages of compact structure, good meshing performance, stable transmission and the like. The gear box comprises a box body 3-1 and a box cover 3-2, the box body 3-1 and the box cover 3-2 can be made of die castings, the box cover 3-2, the box body 3-1 and a support arm 1-1 on one side of the mounting base 1 are fixedly connected together through bolts in sequence, and the gear box is simple in structure and convenient to assemble. A bearing seat 1-2 is arranged on a supporting arm 1-1 on one side, close to a motor 5, of the mounting seat 1, the bearing seat 1-2 can be made of die castings, and the motor 5 is arranged on the bearing seat 1-2. By adopting the structure, the mounting seat 1 can adopt a welding piece, thereby reducing the processing difficulty of the mounting seat 1 and being beneficial to reducing the manufacturing cost of the driving wheel.

In order to improve the rotation stability of the input shaft 3-3, a ball bearing is arranged at one end of the input shaft 3-3 matched with the bearing seat 1-2, and a ball bearing is also arranged at one end of the input shaft 3-3 matched with the box cover 3-2. In addition, a needle bearing is arranged between the input shaft 3-3 and the output shaft 3-5 and used for supporting the input shaft 3-3, so that the input shaft 3-3 is prevented from shaking, and the working stability of the input shaft 3-3 is improved.

The three-stage speed reduction driving wheel assembly further comprises a brake 4, wherein the brake 4 is arranged on the gear box of the gear reducer 3 and connected with one end, extending out of the gear box, of the input shaft 3-3 and used for applying braking force to the input shaft 3-3. The brake 4 directly acts on the input shaft 3-3, so that the brake is more stable and reliable, and the use safety of the driving wheel assembly can be effectively improved. The brake 4 can be a mechanical brake or an electromagnetic brake, and the electromagnetic brake is preferably used in the embodiment, so that the brake has the advantages of compact structure, simplicity in operation, sensitivity in response, long service life, reliability in use, easiness in realizing remote control and the like.

The embodiment also discloses an electric truck, and the driving wheel of the electric truck adopts the three-stage speed reduction driving wheel assembly. Other structures of the electric truck are similar to those of the prior art and will not be described in detail. Because the drive wheel assembly compact structure, occupation space is little, consequently can guarantee that the drive wheel turns to nimble convenience on electric pallet truck, improves electric pallet truck's bearing capacity, reduces electric pallet truck's manufacturing cost.

The utility model discloses a tertiary speed reduction drive wheel assembly and electric pallet truck, its drive wheel assembly set up gear reducer and motor respectively in the both sides of mount pad, and the input shaft passes hollow output shaft and realizes that motor and gear reducer's transmission is connected, and gear reducer adopts tertiary gear reduction design simultaneously for gear reducer's longitudinal dimension is compacter, is favorable to optimizing drive ratio, improves drive wheel output torque. The electric truck adopting the driving wheel assembly has the advantages of flexible and convenient steering, safe and stable running, strong output torque and low manufacturing cost.

The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art should understand the teaching of the present invention, the technical scheme and the embodiments similar to the above technical scheme should not be creatively designed without departing from the spirit of the present invention, and all shall fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a tertiary speed reduction drive wheel assembly, includes mount pad (1), wheel (2), gear reducer (3) and motor (5), one side support arm (1-1) the outside of mount pad (1) is located in gear reducer (3), opposite side support arm (1-1) the outside of mount pad (1) is located in motor (5), its characterized in that: the gear reducer (3) comprises a gear box, an input shaft (3-3), a three-level gear transmission mechanism (3-4) and an output shaft (3-5), the output shaft (3-5) is a hollow shaft, two ends of the output shaft (3-5) are supported on support arms (1-1) on two sides of the mounting base (1) through bearings respectively, the wheel (2) is located between the support arms (1-1) on two sides of the mounting base (1) and is coaxially mounted on the output shaft (3-5), the input shaft (3-3) penetrates through an inner hole of the output shaft (3-5), one end of the input shaft (3-3) is connected with the motor (5), and the other end of the input shaft (3-3) is in transmission connection with the output shaft (3-5) through the three-level gear transmission mechanism (3-4) in the gear box; the three-stage gear transmission mechanism (3-4) is provided with two middle transmission shafts, the two middle transmission shafts are parallelly arranged above the input shaft (3-3), and the axes of the two middle transmission shafts and the input shaft (3-3) are distributed in a triangular shape.

2. The three stage underdrive drive wheel assembly of claim 1, wherein: a hollow wheel shaft (2-1) is installed in the center of the wheel (2), a first internal spline (2-1-1) is arranged on the inner hole wall of the wheel shaft (2-1), a first external spline (3-5-1) is arranged on the output shaft (3-5), and the wheel shaft (2-1) is installed on the output shaft (3-5) through the first internal spline (2-1-1) and the first external spline (3-5-1).

3. The three stage underdrive drive wheel assembly of claim 1, wherein: the three-stage gear transmission mechanism (3-4) comprises a first-stage transmission small gear (3-4-1), a first intermediate transmission shaft (3-4-2), a first-stage transmission large gear (3-4-3), a second-stage transmission small gear (3-4-4), a second intermediate transmission shaft (3-4-5), a second-stage transmission large gear (3-4-6), a third-stage transmission small gear (3-4-7) and a third-stage transmission large gear (3-4-8), wherein the first-stage transmission small gear (3-4-1) is arranged on the input shaft (3-3), the first intermediate transmission shaft (3-4-2) and the second intermediate transmission shaft (3-4-5) are supported in the gear box through bearings respectively, the first-stage transmission gear wheel (3-4-3) and the second-stage transmission pinion (3-4-4) are coaxially mounted on the first intermediate transmission shaft (3-4-2), the second-stage transmission gear wheel (3-4-6) and the third-stage transmission pinion (3-4-7) are coaxially mounted on the second intermediate transmission shaft (3-4-5), the third-stage transmission gear wheel (3-4-8) is mounted on the output shaft (3-5), and the first-stage transmission pinion (3-4-1) and the first-stage transmission gear wheel (3-4-5) are mounted on the output shaft (3-5) -3), the secondary transmission small gear (3-4-4) is meshed with the secondary transmission large gear (3-4-6), and the tertiary transmission small gear (3-4-7) is meshed with the tertiary transmission large gear (3-4-8).

4. The three-stage reduction drive wheel assembly according to claim 3, wherein: one end, located in the gear box, of the output shaft (3-5) is provided with a second external spline (3-5-2), a second internal spline (3-4-8 a) is arranged in a center hole of the three-stage transmission large gear (3-4-8), and the three-stage transmission large gear (3-4-8) is installed on the output shaft (3-5) through the second internal spline (3-4-8 a) and the second external spline (3-5-2).

5. The three-stage reduction drive wheel assembly according to claim 4, wherein: the primary transmission pinion (3-4-1) is integrally formed on the input shaft (3-3), the secondary transmission pinion (3-4-4) is integrally formed on the first intermediate transmission shaft (3-4-2), and the tertiary transmission pinion (3-4-7) is integrally formed on the second intermediate transmission shaft (3-4-5); the primary transmission large gear (3-4-3) is connected with the first intermediate transmission shaft (3-4-2) through a key, and the secondary transmission large gear (3-4-6) is connected with the second intermediate transmission shaft (3-4-5) through a key.

6. The three-stage reduction drive wheel assembly according to claim 5, wherein: the gearbox comprises a box body (3-1) and a box cover (3-2), wherein the box cover (3-2), the box body (3-1) and a support arm (1-1) on one side of the mounting base (1) are fixedly connected together through bolts in sequence; a bearing seat (1-2) is installed on a supporting arm (1-1) on one side, close to a motor (5), of the installation seat (1), and the motor (5) is installed on the bearing seat (1-2).

7. The three-stage reduction drive wheel assembly according to claim 1, wherein: the outer diameter of the wheel (2) is 300-400 mm.

8. The three-stage reduction drive wheel assembly according to any one of claims 1 to 7, wherein: the brake device is characterized by further comprising a brake (4), wherein the brake (4) is installed on a gear box of the gear reducer (3) and connected with one end, extending out of the gear box, of the input shaft (3-3) and used for applying braking force to the input shaft (3-3).

9. The three-stage reduction drive wheel assembly according to claim 8, wherein: the brake (4) is an electromagnetic brake.

10. An electric pallet truck, which is characterized in that: the drive wheel assembly of claim 1 to 9 is used as the drive wheel of the electric truck.

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