Driving wheel assembly of electric forklift

Abstract

The invention discloses an electric forklift driving wheel assembly which comprises an installation support, a first wheel assembly, a second wheel assembly, a first wheel assembly and a second wheel assembly. The wheel assembly is mounted on the mounting bracket in a sleeving manner; the speed reduction assembly is arranged on the first side of the installation support and comprises a shell, a first speed reduction shaft, a first speed reduction gear fixed to the first speed reduction shaft, at least one second speed reduction shaft and a second speed reduction gear fixed to the second speed reduction shaft, and the second speed reduction shaft is in transmission connection with the first speed reduction gear. The shell is fixed to the wheel assembly and the first speed reduction shaft. The motor assembly is arranged on the second side of the mounting support and comprises a motor, a transmission gear is integrated at the end of an output shaft of the motor, the axis of the output shaft and the rotation axis of the transmission gear are collinear and rotate synchronously, the output shaft penetrates through the mounting support to enter the speed reduction assembly, and the transmission gear is meshed with the second speed reduction gear. The mounting process can be simplified, the assembling difficulty is reduced, and the assembling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric forklifts, and in particular to a driving wheel assembly of an electric forklift. Background Art

[0002] Lifting and handling are long-term operations in industrial production, and the equipment usually used is a forklift. The main feature of a forklift is that it has a fork-shaped fork that can lift and lower goods, as well as move forward and backward and turn. The drive mechanism is an important part of the forklift, which is usually composed of a motor assembly, a reduction assembly, a bracket assembly and a wheel assembly. During the assembly process, by introducing a connector, the above-mentioned motor assembly, reduction assembly and bracket assembly are respectively detachably connected to the connector, and at the same time cooperate with each other to drive the wheel assembly to rotate.

[0003] The transmission connection between the motor assembly and the reduction assembly is usually achieved by threading the output shaft of the motor with the coaxial shaft of the reducer, and then meshing the teeth on the concentric shaft with the reduction gear to achieve power transmission. This design requires the motor output shaft, concentric shaft and reducer to fit concentrically, and at least two points must be concentric during assembly. It has high requirements for machining and installation precision, low assembly efficiency and high rework rate. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide an electric forklift drive wheel assembly, which simplifies the installation process and improves the assembly efficiency and qualification rate through an integrated structural design.

[0005] The present disclosure provides a driving wheel assembly of an electric forklift, comprising:

[0006] A mounting bracket having a first side and a second side opposed to each other;

[0007] A wheel assembly, mounted on the mounting bracket;

[0008] A reduction assembly is provided on the first side of the mounting bracket, comprising a housing, a first reduction shaft, a first reduction gear fixed on the first reduction shaft, and at least one second reduction shaft and a second reduction gear fixed on the second reduction shaft, wherein the second reduction shaft is drivingly connected to the first reduction gear, and the housing is respectively fixed to the wheel assembly and the first reduction shaft;

[0009] The motor assembly is arranged on the second side of the mounting bracket, and includes a motor. A transmission gear is integrated at the end of the output shaft of the motor. The axis of the output shaft is colinearly arranged with the rotation axis of the transmission gear and rotates synchronously. The output shaft passes through the mounting bracket and enters the reduction assembly. The transmission gear is meshed with the second reduction gear.

[0010] Optionally, the mounting bracket includes:

[0011] The bracket body includes a motor mounting part and a flange part located on the first axial side of the motor mounting part. The motor mounting part and the flange part are integrally provided. An opening is provided on the second axial side of the motor mounting part. The motor is arranged in the motor mounting part through the opening. The output shaft of the motor passes through the flange part, and the output shaft is integrally formed with the transmission gear;

[0012] The vehicle body connecting body includes a vehicle body connecting part and an outwardly displaced and thickened part. The vehicle body connecting part is arranged outside the flange part along a direction perpendicular to the axis of the motor and forms a wheel accommodating space between the vehicle body connecting part and the flange part. The outwardly displaced and thickened part connects the vehicle body connecting part and the motor mounting part. The wheel assembly is sleeved on the flange part.

[0013] Optionally, the reduction component includes a reducer housing and a flange. The first reduction shaft, the first reduction gear, the second reduction shaft and the second reduction gear are arranged in the reducer housing. The first reduction shaft is fixedly connected to the outer shell through the flange;

[0014] The reducer housing has a first connecting body and a second connecting body. The first connecting body is embedded in the mounting bracket, and the second connecting body is docked with the flange.

[0015] Optionally, the flange part is provided with a bracket shaft hole and a first installation groove. The bracket shaft hole penetrates through the first side and the second side of the flange part along the axis direction of the motor assembly. The first installation groove extends from the second side to the first side of the flange part;

[0016] The motor assembly includes a bearing member sleeved on the output shaft. The output shaft of the motor passes through the bracket shaft hole, and the bearing member is accommodated in the first installation groove.

[0017] Optionally, the flange part is further provided with a second installation groove. The second installation groove extends from the first side to the second side of the flange part. The first connecting body enters the second installation groove. The outer peripheral wall of the first connecting body is in interference fit with the groove wall of the second installation groove. There is a gap between the end face of the first connecting body and the groove bottom of the second installation groove. The output shaft passes through the first connecting body and enters the outer shell. A first sealing member is provided between the first connecting body and the output shaft.

[0018] Optionally, the motor mounting part is provided with a motor mounting cavity recessed towards the flange part. The motor is accommodated in the motor mounting cavity. The motor assembly includes an end cover. The end cover connects the mounting bracket to seal the motor.

[0019] Optionally, the reducer housing includes a first housing and a second housing. The first connecting body is provided on the first housing, and the second connecting body is provided on the second housing. The first housing and the second housing are hermetically connected through a sealing ring.

[0020] Optionally, a groove is provided on the first end face of the first housing and / or the second end face of the second housing. The sealing ring is embedded in the groove and abuts against the first end face and the second end face respectively.

[0021] Optionally, one of the first end face and the second end face is provided with a protrusion, and the other is provided with a recess that cooperates with the protrusion. Both the protrusion and the recess are arranged to avoid the groove.

[0022] Optionally, the protrusion and the recess are provided on the inner side in the radial direction of the reducer housing, and the groove is provided on the outer side in the radial direction of the reducer housing.

[0023] Optionally, a first shaft hole is provided on the first housing, and a second shaft hole is provided on the second housing. The first connecting body is arranged around the first shaft hole, and the second connecting body is arranged around the second shaft hole.

[0024] The output shaft passes through the first connecting body and the first shaft hole, and the output shaft and the first connecting body are hermetically connected through a first sealing member. The first reduction shaft passes through the second shaft hole and the second connecting body, and the first reduction shaft and the second shaft hole are hermetically connected through a second sealing member.

[0025] Optionally, an oil inlet hole and a screw for sealing the oil inlet hole are provided on the reducer housing. The screw is detachably connected to the oil inlet hole.

[0026] Optionally, a magnetic body is provided inside the reducer housing. The magnetic body is away from the vehicle body connecting portion of the mounting bracket, and the magnetic body is arranged at a position below the reducer housing.

[0027] Optionally, the motor includes a rotor and a stator disposed around the rotor; the inner wall of the motor mounting cavity is provided with a limiting step and a guiding step protruding towards the center of the motor mounting cavity. The limiting step is close to the flange portion, and the guiding step is located on the side of the motor mounting cavity away from the flange portion. The distance from the guiding step to the central axis of the motor mounting cavity is greater than the distance from the limiting step to the central axis of the motor mounting cavity. The distance from the guiding step to the central axis of the motor mounting cavity is greater than the distance from the outer wall of the stator to the central axis of the motor mounting cavity. The end face of the stator abuts against the limiting step, and the outer wall of the stator is in clearance fit with the inner wall of the guiding step, and the outer wall of the stator is in interference fit with the inner wall of the motor mounting cavity.

[0028] Optionally, the rotor includes a rotor housing, the output shaft, a rotor iron core mounted on the output shaft, and rotor magnets embedded in the rotor iron core. The rotor housing encloses the rotor iron core and the rotor magnets, and the rotor magnets are made of ferrite material.

[0029] Optionally, a plurality of magnet mounting grooves are provided at intervals on the rotor iron core. Each magnet mounting groove extends from the outer peripheral wall of the rotor iron core towards the output shaft. Limiting protrusions are provided on the groove walls of the magnet mounting grooves. The rotor magnets are axially embedded in the magnet mounting grooves along the output shaft and abut against the bottom wall, side walls and the limiting protrusions of the magnet mounting grooves.

[0030] Optionally, a plurality of deformation protrusions are provided on the bottom wall of the magnet mounting groove. The deformation protrusions can be bent when the rotor magnets enter the magnet mounting grooves to apply a force towards the limiting protrusions to the rotor magnets.

[0031] Optionally, the distance between the two side walls of the magnet mounting groove is less than or equal to the thickness of the rotor magnets. The deformation protrusions are arranged close to the outer peripheral wall of the rotor iron core, and the distance between the deformation protrusions and the limiting protrusions is less than the width of the rotor magnets.

[0032] Optionally, heat dissipation holes are axially formed on the side walls of the magnet mounting groove along the output shaft.

[0033] Optionally, the mounting bracket is made of aluminum alloy material.

[0034] Optionally, the wheel assembly includes a bearing and a wheel. The bearing is sleeved on the flange portion, and the projection of the bearing in the horizontal plane falls within the projection of the flange portion in the horizontal plane. The wheel is sleeved on the bearing and is located in the wheel accommodating space. The wheel is connected to the housing. In the vertical direction of the electric forklift drive wheel assembly, the central lines of the bearing and the wheel are collinearly arranged.

[0035] Optionally, a step is provided on the outer periphery of the bracket body. At least a part of the lower flat plate of the step is located on the outer periphery of the flange portion, and the stepped slope of the step is located on the flange portion or the second side of the bracket body.

[0036] The bearing is sleeved on the step, the inner peripheral wall of the bearing abuts against the lower flat plate, and the side wall of the bearing abuts against the stepped slope.

[0037] Optionally, the stepped slope includes a contact portion and an avoidance portion surrounding the contact portion. The avoidance portion extends from the first side to the second side of the bracket body, and the side wall of the bearing abuts against the contact portion and does not contact the avoidance portion.

[0038] Optionally, the outer diameter of the flange portion is smaller than the outer diameter of the motor mounting portion and larger than the diameter of the motor mounting cavity.

[0039] Optionally, the second side of the flange portion has a plurality of first weight reduction grooves provided around the first mounting groove. The first weight reduction grooves are recessed from the second side to the first side of the flange portion.

[0040] Optionally, the electric forklift drive wheel assembly further includes a controller. The controller is provided on the second side of the outwardly shifted and thickened portion and is in direct contact with the outwardly shifted and thickened portion.

[0041] Optionally, a second weight reduction groove is provided on the second side of the outwardly shifted and thickened portion. The second weight reduction groove is recessed from the second side to the first side.

[0042] Optionally, in the vertical direction of the electric forklift drive wheel assembly, the center lines of the bearing, the wheel, and the mounting bracket are collinear.

[0043] Optionally, an inner chamfer is provided between the limiting step and the flange portion.

[0044] Optionally, the outer diameter of the flange portion is 130 mm, and the distance from the limiting step to the central axis of the motor mounting cavity is 118 mm.

[0045] Optionally, the wheel includes a wheel hub and a tire sleeved on the wheel hub. The wheel hub is sleeved on the bearing, and the housing is fixedly connected to the wheel hub.

[0046] Optionally, in the vertical direction of the electric forklift drive wheel assembly, the projection point of the force application center of the vehicle body connection portion of the vehicle body connection body in the horizontal plane and the projection point of the center of the wheel assembly in the horizontal plane both fall on the projection of the axis of the wheel assembly in the horizontal plane, and the ratio of the distance between the two projection points to the axial dimension of the wheel assembly is 0 to 0.1.

[0047] Optionally, the bracket body and the flange portion are integrally formed.

[0048] Optionally, the flange portion is coaxially arranged with the bracket body, and the radial dimension of the flange portion is smaller than that of the bracket body.

[0049] Implementing the above solution has the following beneficial effects:

[0050] In this application, a transmission gear is integrated at the end of the motor output shaft. The output shaft of the motor sequentially passes through the mounting bracket and enters the reduction assembly, so that the transmission gear directly meshes with the second reduction gear of the reduction assembly, and the power is transmitted to the first reduction shaft. The first reduction shaft is fixedly connected to the wheel assembly through the housing, thereby driving the wheel to rotate. In this design, only the concentric installation of the motor output shaft and the first reduction shaft is required, reducing the number of concentric installation debugging times, simplifying the installation process, reducing the assembly difficulty, and improving the assembly efficiency. Moreover, the reducer and the motor are arranged on both sides of the mounting bracket, and can be modularly separated and assembled, and their installation and disassembly are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 FIG. is a schematic structural diagram of an electric forklift drive wheel assembly provided by an embodiment of the present invention.

[0052] Figure 2 FIG. is a schematic structural diagram of an electric forklift drive wheel assembly provided by an embodiment of the present invention.

[0053] Figure 3 FIG. is an exploded view of an electric forklift drive wheel assembly provided by an embodiment of the present invention.

[0054] Figure 4 FIG. is a sectional view of an electric forklift drive wheel assembly provided by an embodiment of the present invention.

[0055] Figure 5 is Figure 4 a partial schematic view of.

[0056] Figure 6 is Figure 4 a partial schematic view of.

[0057] Figure 7 is Figure 4 a partial schematic view of.

[0058] Figure 8 FIG. is a partial cross-sectional view of a reduction assembly provided by an embodiment of the invention.

[0059] Figure 9 FIG. is a schematic structural diagram of a mounting bracket provided by an embodiment of the present invention.

[0060] Figure 10It is a cross-sectional view of the mounting bracket provided by an embodiment of the present invention.

[0061] Figure 11 It is a schematic structural diagram of the mounting bracket and the bearing assembled together provided by an embodiment of the present invention.

[0062] Figure 12 It is a cross-sectional view of the mounting bracket and the bearing assembled together provided by an embodiment of the present invention.

[0063] Figure 13 It is a schematic structural diagram of the mounting bracket and the controller combined together provided by an embodiment of the present invention.

[0064] Figure 14 It is a schematic structural diagram of the rotor provided by an embodiment of the present invention.

[0065] Figure 15 It is a schematic structural diagram of the rotor provided by an embodiment of the present invention.

[0066] Figure 16 It is a schematic structural diagram of the reduction assembly provided by an embodiment of the present invention.

[0067] Figure 17 It is a sectional view of the reduction assembly provided by an embodiment of the present invention.

[0068] In the figure:

[0069] 100 Mounting bracket, 101 Motor mounting part, 102 Flange part, 103 Body connection part, 104 Outer moving and thickening part, 105 Wheel accommodation space, 106 Bracket shaft hole, 107 First mounting groove, 108 Second mounting groove, 109 Motor mounting cavity, 110 First weight reduction groove, 111 Second weight reduction groove, 112 Inner chamfer, 113 Guiding step, 114 Limiting step, 115 Step, 116 Lower flat plate, 117 Step slope surface, 118 Contact part, 119 Avoiding part,

[0070] 200 Wheel assembly, 201 Bearing, 202 Wheel, 208 Hub, 209 Tire,

[0071] 300 Reduction assembly, 301 Housing, 302 First reduction shaft, 303 First reduction gear, 304 Second reduction shaft, 305 Second reduction gear, 306 Reducer housing, 307 Flange, 308 First connecting body, 309 Second connecting body, 310 Outer peripheral wall of the first connecting body, 311 End face of the first connecting body, 312 Gap, 313 First seal, 314 First housing, 315 Second housing, 316 Sealing ring, 317 First end face, 318 Second end face, 319 Groove body, 320 Protrusion, 321 Depression, 322 First shaft hole, 323 Second shaft hole, 324 Second seal, 325 Oil inlet hole, 326 Screw, 327 Magnet body,

[0072] 400 Motor assembly, 401 motor, 402 end cover, 403 drive gear, 404 bearing component, 405 rotor, 406 stator, 408 end face of the stator, 409 rotor housing, 410 output shaft, 411 rotor core, 412 rotor magnet, 413 magnet mounting groove, 414 limiting protrusion, 415 deformation protrusion, 416 heat dissipation hole

[0073] 500 Controller Specific embodiments

[0074] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0075] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0076] It should be noted that: like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0077] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0078] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0080] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0081] Please refer to Figure 1 and Figure 2 , this embodiment provides an electric forklift drive wheel assembly, which includes a mounting bracket 100, a wheel assembly 200, a reduction assembly 300 and a motor assembly 400. The mounting bracket 100 has a first side and a second side facing away from each other. The reduction assembly 300 is arranged on the first side of the mounting bracket 100, the motor assembly 400 is arranged on the second side of the mounting bracket 100, the wheel assembly 200 is sleeved on the mounting bracket 100 and is located between the reduction assembly 300 and the motor assembly 400. The motor assembly 400 is drivingly connected to the wheel assembly 200 through the reduction assembly 300, so as to be able to drive the wheel 202 in the wheel assembly 200 to rotate. The above-mentioned first side can be defined as the left side, and the second side can be defined as the right side.

[0082] Please refer to Figure 4, the mounting bracket 100 includes a bracket body and a vehicle body connector. The cross-section of the frame body is U-shaped, and the opening of the U-shape faces right, forming the housing of the motor assembly 400. The vehicle body connector has a vertical portion and a horizontal portion, and the two form a lying L-shaped structure. The lower end of the vertical portion is provided at the opening of the frame body, and the horizontal portion is used to dock with the vehicle body. A flange portion 102 is provided on the first side of the bracket body. It should be noted that the flange portion 102 is integrally formed with the frame body. From a process perspective, the integrally formed setting method is more convenient for mold processing and has a lower input cost. From a structural perspective, the fixed installation between the flange portion and the frame body is eliminated, the installation process is simplified, and the coaxiality between the flange portion and the frame body is also ensured.

[0083] The vehicle body connector is connected to the second side of the bracket body and forms a wheel accommodating space 105 with the flange portion 102. Specifically, this accommodating space 105 is formed between the flange portion 102 and the upper side wall of the frame body and the lower side wall of the vehicle body connector.

[0084] The wheel assembly 200 is sleeved on the flange portion 102, the speed reduction assembly 300 is provided on the first side of the flange portion 102, and the motor assembly 400 is provided on the second side of the flange portion 102. The mounting bracket 100 is made of aluminum alloy material. Compared with the mounting bracket 100 made of steel, the aluminum alloy bracket can reduce the weight by about 40%, making assembly and handling more convenient. It should be noted that the hardness of the aluminum alloy material is lower than that of the original steel bracket. Therefore, in this application, the installation position of the wheel assembly 200 is transferred from the motor housing formed by the original frame body to the flange portion 102. Without changing the thickness of the motor housing in the radial direction, the force-bearing requirements of the wheel assembly 200 can be met by using the thickness of the flange portion 102 itself in the radial direction. The transfer of the above installation position is also based on the integrally formed structure of the flange portion 102 and the frame body, ensuring that the central axis of the flange portion coincides with the central axis of the frame body, and thus ensuring that the original coaxiality of the wheel assembly 200 remains unchanged.

[0085] As Figure 3 and Figure 4 shown, the wheel assembly 200 includes a bearing 201 and a wheel 202. The bearing 201 is sleeved on the flange portion 102, and the wheel 202 is sleeved on the bearing 201 and is located in the wheel accommodating space 105. Among them, the wheel 202 includes a hub 208 and a tire 209. The hub 208 is sleeved on the bearing 201, and the tire 209 is sleeved on the hub 208. Among them, the cross-section of the wheel assembly in the radial direction is "I"-shaped. The bearing 201 forms a vertical structure, and the wheel 202 forms a horizontal structure. The wheel 202 extends in the axial direction and can extend to the outside of the motor assembly 400.

[0086] The speed reduction assembly 300 includes a housing 301, a speed reducer housing 306, a flange 307, a first speed reduction shaft 302, a first speed reduction gear 303, a second speed reduction shaft 304, and a second speed reduction gear 305. The first speed reduction shaft 302, the first speed reduction gear 303, the second speed reduction shaft 304, and the second speed reduction gear 305 are arranged inside the speed reducer housing 306. The first speed reduction gear 303 is fixed on the first speed reduction shaft 302. The second speed reduction shaft 304 meshes with the first speed reduction gear 303. The second speed reduction gear 305 is fixed on the second speed reduction shaft 304. The first speed reduction shaft 302 passes through the speed reducer housing 306 and is fixedly connected to the flange 307. The flange 307 is fixedly connected to the housing 301. The housing 301 is fixedly connected to the hub 208 of the wheel assembly 200. The rotation of the first speed reduction shaft 302 can drive the wheel 202 to rotate. The motor assembly 400 includes a motor 401. A transmission gear 403 is integrated at the end of the output shaft 410 of the motor 401. The output shaft 410 passes through the flange portion 102 of the mounting bracket 100 and enters the speed reduction assembly 300. The output shaft 410 is concentrically arranged with the first speed reduction shaft 302. The transmission gear 403 meshes with the second speed reduction gear 305.

[0087] In the above-mentioned drive wheel assembly of the electric forklift, when the motor 401 works, the output shaft 410 rotates, and the transmission gear 403 rotates synchronously with the output shaft 410, and transmits the driving force to the second speed reduction gear 305 meshing with it. The second speed reduction gear 305 drives the second speed reduction shaft 304 to rotate synchronously, and transmits the driving force to the first speed reduction gear 303 meshing with it. The first speed reduction gear 303 drives the first speed reduction shaft 302 to rotate synchronously, and then drives the flange 307, the housing 301, and the wheel 202 of the wheel assembly 200 to rotate synchronously, achieving the purpose of driving the wheel 202 to move. In this design, firstly, the output shaft 410 of the motor is extended into the speed reduction assembly 300, replacing the original connecting shaft required, ensuring the first coaxiality; the transmission gear 403 is integrated on the output shaft 410, replacing the corresponding gear that needs to be installed on the original connecting shaft, ensuring the second coaxiality; due to the long length of the output shaft 410, the bearing member 404 is needed for auxiliary support, and then the flange portion 410 is integrally arranged with the vehicle frame main body (equivalent to the motor housing), ensuring the third coaxiality, reducing the number of concentric installation and debugging times, being able to simplify the installation process, reduce the assembly difficulty, and improve the assembly efficiency. Moreover, the speed reduction assembly and the motor 401 are arranged on both sides of the mounting bracket 100, and can be modularly separated and assembled, and their installation and disassembly are more convenient.

[0088] In this embodiment, a flange portion 102 is provided on the first side of the bracket body, and the second side of the bracket body is connected to the vehicle body connector, so that the center line of the bracket body is transferred to the flange portion 102, and the reduction assembly 300 and the motor assembly 400 are arranged on both sides of the flange portion 102, and the bearing 201 of the wheel assembly 200 is arranged on the flange portion 102, so that in the vertical direction of the electric forklift driving wheel assembly, the center line of the bearing 201, the center line of the wheel 202 and the center line of the mounting bracket 100 are collinear, ensuring that the electric forklift driving wheel is evenly stressed during operation, thereby improving the stability of the wheel during movement and rotation.

[0089] In addition, in this embodiment, the reduction assembly 300 and the motor assembly 400 are arranged on both sides of the flange 102, and the wheel assembly 200 is arranged on the flange 102. Since the motor 401 or the reducer does not need to be accommodated in the middle of the flange 102, the radial thickness of the flange 102 can provide sufficient support. In addition, it is also worth noting that the radial thickness of the flange 102 can be adjusted. Originally, due to the need to ensure the size in the vertical direction, the size of the bearing was limited, and the relative distance between the inner and outer rings was small. However, in the design of this application, the radial and axial thicknesses of the flange can provide sufficient support. Therefore, the flange 102 and the bearing 201 can adopt a retracted structure at the joint. In this way, without changing or even reducing the chassis height, the relative distance between the inner and outer rings of the bearing 201 can be larger, providing greater support for the wheel assembly 200 and ensuring the stability of operation. In addition, since the mounting bracket 100 is made of aluminum alloy material, even if the axial thickness of the flange 102 is increased, the weight of the mounting bracket 100 can be reduced as a whole, making assembly and transportation more convenient.

[0090] See also Figure 9 and Figure 10 The vehicle body connector includes a vehicle body connector portion 103 and an outwardly displaced thickened portion 104. The vehicle body connector portion 103 is disposed on the outside of the flange portion 102 and forms the wheel accommodating space 105 between the flange portion 102. The outwardly displaced thickened portion 104 connects the vehicle body connector portion 103 and the motor mounting portion 101. The wheel assembly 200 is mounted on the flange portion 102.

[0091] See also Figure 4 , Figure 6 and Figure 10, the flange portion 102 is provided with a bracket shaft hole 106 and a first mounting groove 107. The bracket shaft hole 106 penetrates through the first side and the second side of the flange portion 102, and the first mounting groove 107 extends from the second side to the first side of the flange portion 102. The motor assembly 400 includes a bearing member 404 sleeved on the output shaft 410. The output shaft 410 of the motor 401 passes through the bracket shaft hole 106, and the bearing member 404 is received in the first mounting groove 107. In this embodiment, the bearing member 404 not only plays a role of rotation support that is symmetric left and right, but also plays a role of short fulcrum support for the extended portion of the output shaft 410, weakening the effect of the output shaft 410 being deformed after the transmission gear 403 is stressed.

[0092] Please refer to Figure 4 , the reducer housing 306 has a first connecting body 308 and a second connecting body 309. The first connecting body 308 is embedded in the mounting bracket 100, and the second connecting body 309 is docked with the flange 307.

[0093] Please refer to Figure 4 , Figure 5 and Figure 10 , the flange portion 102 is provided with a second mounting groove 108. The second mounting groove 108 extends from the first side to the second side of the flange portion 102. The first connecting body 308 enters the second mounting groove 108. The outer peripheral wall 310 of the first connecting body is in interference fit with the groove wall of the second mounting groove 108, and there is a gap 312 between the end face 311 of the first connecting body and the groove bottom of the second mounting groove 108. The output shaft 410 passes through the first connecting body 308, and a first seal 313 is provided between the first connecting body 308 and the output shaft 410. In this embodiment, by setting the outer peripheral wall 310 of the first connecting body to be in interference fit with the groove wall of the second mounting groove 108, the outer peripheral wall 310 of the first connecting body is limited, so that the end face 311 of the first connecting body just contacts or has a gap 312 with the groove bottom of the second mounting groove 108, preventing the end face 311 of the first connecting body from being embedded into the second mounting groove 108 excessively and causing the mounting bracket 100 to deform.

[0094] In a possible implementation manner, please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8, the reducer housing 306 includes a first housing 314 and a second housing 315. A first shaft hole 322 is provided on the first housing 314, and a second shaft hole 323 is provided on the second housing 315. The first connecting body 308 is disposed around the first shaft hole 322, and the second connecting body 309 is disposed around the second shaft hole 323. The output shaft 410 passes through the first connecting body 308 and the first shaft hole 322, and the output shaft 410 is hermetically connected to the first connecting body 308 through a first seal 313. The first reduction shaft 302 passes through the second shaft hole 323 and the second connecting body 309, and the first reduction shaft 302 is hermetically connected to the second shaft hole 323 through a second seal 324. The first housing 314 and the second housing 315 are hermetically connected through a sealing ring 316. In this embodiment, a first seal 313 is sleeved on the output shaft 410 of the motor 401, and the first connecting body 308 is used to limit the first seal 313. A second seal 324 is sleeved on the first reduction shaft 302, and the second housing 315 is used to limit the second seal 324 to ensure the sealing performance inside the reducer housing 306.

[0095] A groove 319 is provided on the first end face 317 of the first housing 314 and / or the second end face 318 of the second housing 315. The sealing ring 316 is embedded in the groove 319 and abuts against the first end face 317 and the second end face 318 respectively. Exemplarily, as Figure 8 shown, a groove 319 is provided on the first end face 317 of the first housing 314, the sealing ring 316 is embedded in the groove 319, and the second end face 318 of the second housing 315 abuts against the sealing ring 316 to achieve the sealing at the connection between the first housing 314 and the second housing 315.

[0096] In a possible implementation manner, one of the first end face 317 and the second end face 318 is provided with a protrusion 320, and the other is provided with a recess 321 that cooperates with the protrusion 320. Exemplarily, as Figure 7 and Figure 8 shown, a protrusion 320 is provided on the inner side of the first end face 317 of the first housing 314, and a recess 321 that cooperates with the protrusion 320 is provided on the inner side of the second end face 318 of the second housing 315. During the installation and docking process of the first housing 314 and the second housing 315, the protrusion 320 and the recess 321 cooperate to play a role in positioning and guiding. Moreover, the protrusion 320 is embedded in the recess 321 and the two are in interference fit, which can also play a role in hard sealing, further improving the sealing effect at the connection between the first housing 314 and the second housing 315.

[0097] In a possible implementation, the protrusion 320 and the recess 321 are both arranged to avoid the groove 319. Preferably, the protrusion 320 and the recess 321 are arranged on the radial inner side of the reducer housing 306, and the groove 319 is arranged on the radial outer side of the reducer housing 306. Here, the groove 319 is staggered with the protrusion 320 or the recess 321, which can increase the contact area between the first end face 317 of the first housing 314 and the second end face 318 of the second housing 315, and reduce or avoid the lubricating oil inside the reducer housing 306 from leaking outward from the junction of the first housing 314 and the second housing 315.

[0098] Figure 3 and Figure 4 In the structure shown, the deceleration assembly 300 is accommodated in the cavity formed by the mounting bracket 100 and the housing 301, and the parts are not exposed to the outside, which can extend the service life of the deceleration assembly 300. In a possible implementation, as Figure 16 As shown, the reducer housing 306 is provided with an oil inlet hole 325 and a screw 326 for sealing the oil inlet hole 325, and the screw 326 is detachably connected to the oil inlet hole 325. The screw 326 is removed from the reducer housing 306 to expose the oil inlet hole 325, and lubricating oil can be poured into the reducer housing 306. The lubricating oil can not only lubricate the reduction gear and the reduction shaft in the reducer housing 306 to make them rotate smoothly and extend the service life of the reduction assembly, but also play the role of cooling the reduction gear and the reduction shaft and reducing working noise.

[0099] In one possible implementation, see Figure 17 , a magnetic body 327 is provided in the reducer housing 306, and the magnetic body 327 is away from the vehicle body connection portion 103. Exemplarily, the magnetic body 327 is a magnet. The reduction gear and the reduction shaft transmit power through meshing, and debris will be generated due to wear during the operation. The magnetic body 327 is provided in the reducer housing 306, which can absorb the debris and prevent the debris from entering the meshing part to affect the normal operation of the reduction gear and the reduction shaft, thereby increasing the service life of the reduction assembly 300. It is worth noting that the magnetic body 327 is arranged at a lower position of the reducer housing 306 in the vertical direction. The above-mentioned debris will fall under its own gravity and will be gathered together by the magnetic body 327, which can prevent the reduction gear from rolling the debris into the meshing part during rotation.

[0100] See also Figure 4 , Figure 6 and Figure 10, a motor mounting portion 101 is provided on the second side of the bracket body. The motor mounting portion 101 is provided with a motor mounting cavity 109 that is recessed toward the flange portion 102. The motor 401 is accommodated in the motor mounting cavity 109. The motor assembly 400 further includes an end cover 402. The end cover 402 is connected to the motor mounting portion 101 to seal the motor 401. In this embodiment, the second side of the bracket body is recessed inward to form the motor mounting cavity 109. The motor 401 is mounted in the motor mounting cavity 109, eliminating the need to introduce a motor housing, which can save costs and reduce the radial dimension at the motor, making the overall structure more integrated.

[0101] In a possible implementation, please refer to Figure 4 and Figure 6 , the motor 401 includes a rotor 405 and a stator 406 disposed around the rotor 405; the inner wall of the motor mounting cavity 109 is provided with a limiting step 114 and a guiding step 113 that protrude toward the center of the motor mounting cavity 109. The limiting step 114 is close to the flange portion 102, and the guiding step 113 is located on the side of the motor mounting cavity 109 away from the flange portion 102. The distance from the guiding step 113 to the central axis of the motor mounting cavity 109 is greater than the distance from the limiting step 114 to the central axis of the motor mounting cavity 109, and the distance from the guiding step 113 to the central axis of the motor mounting cavity 109 is greater than the distance from the stator 406 to the central axis of the motor mounting cavity 109. During the process of loading the motor 401 into the motor mounting cavity 109, there is a clearance fit between the stator 406 and the guiding step 113, facilitating the introduction of the end of the stator 406. The end face 408 of the stator abuts against the limiting step 114 to prevent overloading of the motor 401. The outer wall of the stator 406 has an interference fit with the inner wall of the motor mounting cavity 109.

[0102] Such as Figure 6As shown, the motor installation cavity 109 is integrally in the shape of a hollow cylinder. The diameter at the guiding step 113 is slightly larger than the diameter at the limiting step 114. The diameter of the stator 406 is slightly smaller than the diameter at the guiding step 113 and slightly larger than the diameter at the limiting step 114. When installing the stator 406, it first docks with the guiding step 113 from the second side of the mounting bracket 100, and then the stator 406 is pushed towards the flange portion 102 until the front end face of the stator 406 abuts against the limiting step 114. At this time, the stator 406 is installed in place, and the outer wall of the stator 406 has an interference fit with a section of the electronic installation cavity between the guiding step 113 and the limiting step 114. This structural design can improve the installation efficiency of the stator 406 and the installation accuracy of the stator 406. In addition, by arranging the stator 406 of the motor 401 closely against the inner wall of the motor installation cavity 109, the heat generated during the operation of the motor 401 can be conducted out through the mounting bracket 100 made of aluminum alloy material, which can improve the heat dissipation effect of the motor 401.

[0103] As Figure 10 shown, an inner chamfer 112 is also provided between the limiting step 114 and the flange portion 102, which is convenient for demolding during processing. Exemplarily, the outer diameter of the flange portion 102 is 130 mm, and the distance from the limiting step 114 to the central axis of the motor installation cavity 109 is 118 mm.

[0104] Please refer to Figure 6 、 Figure 14 and Figure 15 , the rotor 405 includes a rotor housing 409, the output shaft 410, a rotor core 411 mounted on the output shaft 410, and rotor magnets 412 embedded in the rotor core 411. The rotor housing 409 wraps the rotor core 411 and the rotor magnets 412. The rotor magnets 412 are made of ferrite material. Compared with rare earth materials, the ferrite material has relatively stable and low prices and can adapt to high-temperature working environments. The maximum power of the motor 401 can reach 94%.

[0105] A plurality of magnet mounting grooves 413 are provided on the rotor core 411 at intervals around the output shaft 410. Each magnet mounting groove 413 extends from the outer peripheral wall of the rotor core 411 towards the output shaft 410. Limiting protrusions 414 are provided on the groove walls of the magnet mounting grooves 413. The rotor magnets 412 are axially embedded in the magnet mounting grooves 413 and abut against the bottom wall, side walls and the limiting protrusions 414 of the magnet mounting grooves 413. In this embodiment, the magnets adopt an embedded design, and the four sides of the magnets are limited by the rotor core 411. In addition, the axial end faces of the magnets are limited by the rotor housing 409, which improves the stability of magnet installation and can prevent the magnets from shaking.

[0106] Please refer toFigure 15 , a plurality of deformation protrusions 415 are provided on the bottom wall of the magnet mounting groove 413. The deformation protrusions 415 can be bent when the rotor magnet 412 enters the magnet mounting groove 413, so as to apply a force towards the limiting protrusion 414 to the rotor magnet 412. Wherein, the distance between the two side walls of the magnet mounting groove 413 is less than or equal to the thickness of the rotor magnet 412. The deformation protrusions 415 are arranged close to the outer peripheral wall of the rotor iron core 411, and the distance between the deformation protrusions 415 and the limiting protrusion 414 is less than the width of the rotor magnet 412. When installing the magnet, the magnet is inserted into the magnet mounting groove 413 along the axis of the output shaft 410. During the insertion process, the magnet abuts against and bends the deformation protrusions 415. The bent deformation protrusions 415 can apply an outward force to the magnet in the radial direction, so that the outer side wall of the magnet abuts more closely against the limiting protrusion 414 of the magnet mounting groove 413.

[0107] In a possible implementation manner, please refer to Figure 15 , heat dissipation holes 416 are axially formed on the side wall of the magnet mounting groove 413 along the output shaft 410, and the heat generated by the magnet can be quickly dissipated from the heat dissipation holes 416.

[0108] Please refer to Figures 9 - 12 , a step 115 is provided on the outer periphery of the bracket body. At least part of the lower flat plate 116 of the step 115 is located on the outer periphery of the flange portion 102, and the step slope surface 117 of the step 115 is located on the flange portion 102 or the second side of the bracket body. The bearing 201 is sleeved on the step 115. The inner peripheral wall of the bearing 201 abuts against the lower flat plate 116, and the side wall of the bearing 201 abuts against the step slope surface 117. In this embodiment, the part of the mounting bracket 100 for mounting the bearing 201 is designed as a sunken structure. On the premise of ensuring sufficient supporting force, the size is further reduced radially, and the chassis height is further reduced.

[0109] Please refer to Figure 12 , the step slope surface 117 includes a contact portion 118 and an avoidance portion 119 surrounding the contact portion 118. The avoidance portion 119 extends from the first side to the second side of the bracket body. The side wall of the bearing 201 abuts against the contact portion 118 and does not contact the avoidance portion 119. Among them, the contact portion 118 abuts against the bearing 201 to play a role in positioning the bearing 201, and the setting of the avoidance portion 119 is to prevent the contact area between the step slope surface 117 and the side wall of the bearing 201 from being too large, affecting the normal operation of the bearing 201.

[0110] The outer diameter of the flange portion 102 is smaller than that of the motor mounting portion 101 and larger than the diameter of the motor mounting cavity 109. Since the flange portion 102 needs to bear the force exerted by the wheel 202, the connection between the flange portion 102 and the motor mounting portion 101 requires sufficient stiffness to adapt to the above-mentioned force. By controlling the diameter ranges of the flange portion 102, the motor mounting portion 101, and the motor mounting cavity 109, the structural stability can be ensured.

[0111] Please refer to Figure 11 , on the second side of the flange portion 102, there are a plurality of first weight reduction grooves 110 arranged around the first mounting groove 107, and the first weight reduction grooves 110 are recessed from the second side to the first side of the flange portion 102. The provision of the first weight reduction grooves 110 on the flange portion 102 can, on the one hand, reduce the mass of the flange portion 102. The first weight reduction grooves 110 are in contact with the motor 401 and also play a role in assisting heat dissipation.

[0112] Please continue to refer to Figure 11 , on the second side of the outwardly shifted and thickened portion 104, there is also a second weight reduction groove 111, and the second weight reduction groove 111 is recessed from the second side to the first side. The provision of the second weight reduction groove 111 on the outwardly shifted and thickened portion can further reduce the mass of the mounting bracket 100 on the premise of ensuring the strength of the outwardly shifted and thickened portion 104.

[0113] Please refer to Figure 13 , the electric forklift drive wheel assembly further includes a controller 500, and the controller 500 is arranged on the second side of the outwardly shifted and thickened portion 104 and is in direct contact with the outwardly shifted and thickened portion 104. The heat generated during the operation of the controller 500 can be dissipated through the mounting bracket 100 made of aluminum alloy material, improving the heat dissipation efficiency of the controller 500. Among them, the controller 500 preferably can be docked with controllers 500 of different types of forklift structures, and has better compatibility compared with the design in the prior art where the controller 500 is matched with the forklift type one by one. Specifically, screw hole positions 326 can be reserved on the outwardly shifted and thickened portion 104 of the mounting bracket 100 for installing the controller 500.

[0114] The mounting bracket provided in this embodiment integrates the functions of part of the motor housing, has a novel and compact structure, saves space; is more convenient to process; multiple positioning, locking and other processes can be omitted during installation, and the installation efficiency can be improved; from the perspective of the use effect, the motor and the transmission mechanism are stably arranged in the mounting bracket, and the mechanical vibration and noise during operation can be reduced.

[0115] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electric forklift drive wheel assembly, characterized in that, Comprising: An installation bracket (100) having opposite first and second sides; A wheel assembly (200) sleeved on the installation bracket (100); A speed reduction assembly (300) provided on the first side of the installation bracket (100), including a housing (301), a first speed reduction shaft (302), a first speed reduction gear (303) fixed on the first speed reduction shaft (302), further including at least one second speed reduction shaft (304) and a second speed reduction gear (305) fixed on the second speed reduction shaft (304), the second speed reduction shaft (304) being in transmission connection with the first speed reduction gear (303), and the housing (301) being respectively fixed to the wheel assembly (200) and the first speed reduction shaft (302); A motor assembly (400) provided on the second side of the installation bracket (100), including a motor (401), a transmission gear (403) being integrated at the end of the output shaft (410) of the motor (401), the axis of the output shaft (410) being collinear with the rotation axis of the transmission gear (403) and rotating synchronously, the output shaft (410) passing through the installation bracket (100) and entering the speed reduction assembly (300), and the transmission gear (403) meshing with the second speed reduction gear (305).

2. The electric forklift drive wheel assembly according to claim 1, characterized in that, The installation bracket (100) includes: A bracket main body including a motor installation part (101) and a flange part (102) located on the first axial side of the motor installation part (101), the motor installation part (101) and the flange part (102) being integrally provided, an opening being provided on the second axial side of the motor installation part (101), the motor (401) being provided in the motor installation part (101) through the opening, the output shaft (410) of the motor (401) passing through the flange part (102), and the output shaft (410) and the transmission gear (403) being integrally formed; A vehicle body connection body including a vehicle body connection part (103) and an outwardly displaced and thickened part (104), the vehicle body connection part (103) being provided outside the flange part (102) along a direction perpendicular to the axis of the motor (401) and forming a wheel accommodation space (105) between the vehicle body connection part (103) and the flange part (102), the outwardly displaced and thickened part (104) connecting the vehicle body connection part (103) and the motor installation part (101), and the wheel assembly (200) being sleeved on the flange part (102).

3. The electric forklift drive wheel assembly according to claim 1, wherein The speed reduction assembly (300) includes a speed reducer housing (306) and a flange (307), the first speed reduction shaft (302), the first speed reduction gear (303), the second speed reduction shaft (304) and the second speed reduction gear (305) are provided in the speed reducer housing (306), and the first speed reduction shaft (302) is fixedly connected to the housing (301) through the flange (307); The reducer housing (306) has a first connecting body (308) and a second connecting body (309). The first connecting body (308) is embedded in the mounting bracket (100), and the second connecting body (309) is docked with the flange (307).

4. The electric forklift drive wheel assembly according to claim 2, wherein The flange portion (102) is provided with a bracket shaft hole (106) and a first mounting groove (107). The bracket shaft hole (106) penetrates through the first side and the second side of the flange portion (102) along the axis direction of the motor assembly (400). The first mounting groove (107) extends from the second side to the first side of the flange portion (102); The motor assembly (400) includes a bearing member (404) sleeved on the output shaft (410). The output shaft (410) of the motor (401) passes through the bracket shaft hole (106), and the bearing member (404) is accommodated in the first mounting groove (107).

5. The electric forklift drive wheel assembly according to claim 3, wherein The flange portion (102) is further provided with a second mounting groove (108). The second mounting groove (108) extends from the first side to the second side of the flange portion (102). The first connecting body (308) enters the second mounting groove (108). The outer peripheral wall (310) of the first connecting body is in interference fit with the groove wall of the second mounting groove (108). There is a gap (312) between the end face (311) of the first connecting body and the groove bottom of the second mounting groove (108). The output shaft (410) passes through the first connecting body (308) and enters the housing (301). A first seal (313) is provided between the first connecting body (308) and the output shaft (410).

6. The electric forklift drive wheel assembly according to claim 2, wherein The motor mounting portion (101) is provided with a motor mounting cavity (109) recessed towards the flange portion (102). The motor (401) is accommodated in the motor mounting cavity (109). The motor assembly (400) includes an end cover (402). The end cover (402) is connected to the mounting bracket (100) to seal the motor (401).

7. The electric forklift drive wheel assembly according to claim 3, wherein The reducer housing (306) includes a first housing (314) and a second housing (315). The first connecting body (308) is provided on the first housing (314), and the second connecting body (309) is provided on the second housing (315). The first housing (314) and the second housing (315) are sealed and connected by a sealing ring (316).

8. The electric forklift drive wheel assembly according to claim 7, wherein A groove (319) is provided on the first end face (317) of the first housing (314) and / or the second end face (318) of the second housing (315). The sealing ring (316) is embedded in the groove (319) and abuts against the first end face (317) and the second end face (318) respectively.

9. The drive wheel assembly of an electric forklift according to claim 8, wherein One of the first end face (317) and the second end face (318) is provided with a protrusion (320), and the other is provided with a recess (321) that cooperates with the protrusion (320). The protrusion (320) and the recess (321) are both arranged avoiding the groove (319).

10. The drive wheel assembly of an electric forklift according to claim 9, wherein The protrusion (320) and the recess (321) are arranged inside the reducer housing (306) in the radial direction, and the groove (319) is arranged outside the reducer housing (306) in the radial direction. Preferably, a first shaft hole (322) is provided on the first housing (314), a second shaft hole (323) is provided on the second housing (315), the first connecting body (308) is arranged around the first shaft hole (322), and the second connecting body (309) is arranged around the second shaft hole (323). The output shaft (410) passes through the first connecting body (308) and the first shaft hole (322), and the output shaft (410) is hermetically connected to the first connecting body (308) through a first seal (313). The first reduction shaft (302) passes through the second shaft hole (323) and the second connecting body (309), and the first reduction shaft (302) is hermetically connected to the second shaft hole (323) through a second seal (324). Preferably, an oil inlet hole (325) and a screw (326) for sealing the oil inlet hole (325) are provided on the reducer housing (306), and the screw (326) is detachably connected to the oil inlet hole (325). Preferably, a magnetic body (327) is provided inside the reducer housing (306). The magnetic body (327) is away from the vehicle body connecting portion (103) of the mounting bracket (100), and the magnetic body (327) is arranged at a position below the reducer housing. Preferably, the motor (401) includes a rotor (405) and a stator (406) disposed around the rotor (405); the inner wall of the motor mounting cavity (109) is provided with a limiting step (114) and a guiding step (113) protruding towards the center of the motor mounting cavity (109), the limiting step (114) is close to the flange portion (102), the guiding step (113) is located on the side of the motor mounting cavity (109) away from the flange portion (102), the distance from the guiding step (113) to the central axis of the motor mounting cavity (109) is greater than the distance from the limiting step (114) to the central axis of the motor mounting cavity (109), the distance from the guiding step (113) to the central axis of the motor mounting cavity (109) is greater than the distance from the outer wall of the stator (406) to the central axis of the motor mounting cavity (109), the end face (408) of the stator abuts against the limiting step (114), the outer wall of the stator (406) is in clearance fit with the inner wall of the guiding step (113), and the outer wall of the stator (406) is in interference fit with the inner wall of the motor mounting cavity (109). Preferably, the rotor (405) includes a rotor housing (409), the output shaft (410), a rotor core (411) mounted on the output shaft (410), and rotor magnets (412) embedded in the rotor core (411), the rotor housing (409) encloses the rotor core (411) and the rotor magnets (412), and the rotor magnets (412) are made of ferrite material. Preferably, a plurality of magnet mounting grooves (413) are provided on the rotor core (411) at intervals, each magnet mounting groove (413) extends from the outer peripheral wall of the rotor core (411) towards the output shaft (410), a limiting protrusion (414) is provided on the groove wall of the magnet mounting groove (413), and the rotor magnets (412) are axially embedded in the magnet mounting grooves (413) along the output shaft (410) and abut against the bottom wall, side wall and the limiting protrusion (414) of the magnet mounting groove (413). Preferably, a plurality of deformation protrusions (415) are provided on the bottom wall of the magnet mounting groove (413), and the deformation protrusions (415) can be bent when the rotor magnets (412) enter the magnet mounting grooves (413) to apply a force towards the limiting protrusion (414) to the rotor magnets (412). Preferably, the distance between the two side walls of the magnet mounting groove (413) is less than or equal to the thickness of the rotor magnets (412), the deformation protrusions (415) are arranged close to the outer peripheral wall of the rotor core (411), and the distance between the deformation protrusions (415) and the limiting protrusion (414) is less than the width of the rotor magnets (412). Preferably, heat dissipation holes (416) are axially formed in the side walls of the magnet mounting groove (413) along the output shaft (410). Preferably, the mounting bracket (100) is made of aluminum alloy material. Preferably, the wheel assembly (200) includes a bearing (201) and a wheel (202). The bearing (201) is sleeved on the flange portion (102), and the projection of the bearing (201) in the horizontal plane falls within the projection of the flange portion (102) in the horizontal plane. The wheel (202) is sleeved on the bearing (201) and is located in the wheel accommodation space (105). The wheel (202) is connected to the housing (301). In the vertical direction of the electric forklift drive wheel assembly, the center lines of the bearing (201) and the wheel are collinearly arranged. Preferably, a step (115) is provided on the outer periphery of the bracket body. The lower flat plate (116) of the step (115) is at least partially located on the outer periphery of the flange portion (102), and the step slope surface (117) of the step (115) is located on the flange portion (102) or the second side of the bracket body. The bearing (201) is sleeved on the step (115). The inner peripheral wall of the bearing (201) abuts against the lower flat plate (116), and the side wall of the bearing (201) abuts against the step slope surface (117). Preferably, the step slope surface (117) includes a contact portion (118) and an avoidance portion (119) surrounding the contact portion (118). The avoidance portion (119) extends from the first side to the second side of the bracket body. The side wall of the bearing (201) abuts against the contact portion (118) and does not contact the avoidance portion (119). Preferably, the outer diameter of the flange portion (102) is smaller than the outer diameter of the motor mounting portion (101) and larger than the diameter of the motor mounting cavity (109). Preferably, the second side of the flange portion (102) has a plurality of first weight reduction grooves (110) arranged around the first mounting groove (107). The first weight reduction grooves (110) are recessed from the second side to the first side of the flange portion (102). Preferably, the electric forklift drive wheel assembly further includes a controller (500). The controller (500) is provided on the second side of the outwardly shifted and thickened portion (104) and is in direct contact with the outwardly shifted and thickened portion (104). Preferably, a second weight reduction groove (111) is provided on the second side of the outwardly shifted and thickened portion (104). The second weight reduction groove (111) is recessed from the second side to the first side. Preferably, in the vertical direction of the electric forklift drive wheel assembly, the center lines of the bearing (201), the wheel (202), and the mounting bracket (100) are collinearly arranged. Preferably, an inner chamfer (112) is provided between the limit step (114) and the flange portion (102). Preferably, the outer diameter of the flange portion (102) is 130 mm, and the distance from the limit step (114) to the central axis of the motor mounting cavity (109) is 118 mm. Preferably, the wheel (202) includes a hub (208) and a tire (209) sleeved on the hub (208). The hub (208) is sleeved on the bearing (201), and the housing (301) is fixedly connected to the hub (208). Preferably, in the vertical direction of the driving wheel assembly of the electric forklift, the projection point of the force application center of the vehicle body connecting portion (103) of the vehicle body connector and the projection point of the center of the wheel assembly (200) in the horizontal plane both fall on the projection of the axis of the wheel assembly (200) in the horizontal plane, and the ratio of the distance between the two projection points to the axial dimension of the wheel assembly (200) is 0 to 0.

1. Preferably, the bracket body and the flange portion (102) are integrally formed. Preferably, the flange portion (102) and the bracket body are coaxially arranged, and the radial dimension of the flange portion (102) is smaller than that of the bracket body.

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