Forklift driving assembly

Abstract

The invention provides a forklift driving assembly, and belongs to the technical field of forklifts. The problem that an existing forklift driving assembly is insufficient in operation stability is solved. The forklift driving assembly comprises a machine base, a driving assembly and a wheel axle which is horizontally arranged and can rotate in the circumferential direction, a lining axially fixed relative to the machine base is horizontally arranged in the machine base, the driving assembly is connected with the lining and can drive the lining to rotate in the circumferential direction, one end of the wheel axle is detachably inserted into the lining and is axially fixed relative to the lining, and the other end of the wheel axle is connected with the driving assembly. The wheel shaft is connected with the lining through a spline. The driving assembly has the advantages of being convenient to disassemble and assemble, and meanwhile the operation stability of the driving assembly can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of forklifts and relates to a forklift drive assembly. Background Art

[0002] As an important equipment in modern warehousing and logistics industry, electric forklifts have gradually replaced traditional internal combustion forklifts due to their environmental protection, economy and high efficiency. The drive assembly is the core part of the electric forklift, which is mainly responsible for the transmission and control of power. The design of the drive assembly directly affects the performance and reliability of the forklift.

[0003] The drive assembly of a forklift usually includes a machine base and an electric motor, a transmission, a transmission system, and a travel wheel arranged on the machine base. In conventional technology, bearings and gears are usually directly mounted on the axle to achieve the installation of the axle on the machine base and power transmission. For example, a forklift motor drive wheel assembly disclosed in a Chinese patent document (application number: 201821790728.9) includes a main housing, a wheel groove at the bottom of the main housing, a wheel axle passing through the drive wheel, the wheel axle passing through the housing, a cap at one end of the wheel axle, and a nut threadedly connected to the other end of the wheel axle, and the nut is screwed to abut against the outer side of the side cover by screwing the nut, and the cap of the wheel axle can be abutted against the outer side of the main housing, thereby fixing the wheel axle. Although the forklift motor drive assembly can remove the drive wheel by removing the nut and pulling out the wheel axle, the following shortcomings still exist in actual use: the forklift motor drive assembly is the same as the conventional technology, and both ends of the wheel axle are connected to the box (or called the machine base) through bearings, and the output gear is directly set on the wheel axle to transmit power. Since the forklift needs to carry heavy goods and requires the wheel axle to have good installation stability, the wheel axle and the bearing are usually fitted with interference fit, which results in the need to use special tools to make the wheel axle disengage from the bearing when the drive assembly is disassembled and assembled. Therefore, there is still the problem of troublesome and laborious disassembly. In addition, since the output gear is installed on the wheel axle, when the wheel axle is removed, it will affect the installation and alignment of the output gear. Therefore, when reinstalling the wheel axle, it is necessary to move or adjust the position of the output gear again. However, the output gear is located in the box with limited space, which makes the entire operation process more troublesome. Therefore, the forklift motor drive wheel assembly still has the problem of more troublesome installation and maintenance. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to propose a forklift drive assembly. The present invention solves the problem that the prior forklift drive assembly is troublesome to install and maintain.

[0005] The objectives of the present invention can be achieved through the following technical solutions: a forklift drive assembly, comprising a machine base, a drive component and a horizontally arranged and rotatable wheel axle, characterized in that a bushing is horizontally arranged in the machine base and is axially fixed relative to the machine base, the drive component is connected to the bushing and can drive the bushing to rotate circumferentially, one end of the wheel axle is detachably inserted into the bushing and is axially fixed relative to the bushing, and the wheel axle and the bushing are connected by a spline.

[0006] Since a bushing fixed relative to the axial direction of the base is provided in the base, and the drive assembly is connected to the bushing to drive the bushing to rotate, and the wheel shaft and the bushing are connected by a spline, when the drive assembly drives the bushing to rotate, the wheel shaft can be driven to rotate synchronously, so there is no need to set a gear on the wheel shaft to transmit power. In this structure, the bushing serves as an intermediate part to separate the wheel shaft from the gear box, so that when the wheel shaft is removed, there is no need to dismantle the gear box, so it will not affect the installation and alignment of the gears in the gear box, and there is no need to move and adjust the position of the gears in the gear box when installing the wheel shaft, so that the installation and removal of the wheel shaft is very convenient.

[0007] In addition, since the transmission end of the wheel axle extends into the bushing and is supported by the bushing, the problem of large friction when the wheel axle is disassembled due to the bearing sleeve on the transmission end of the wheel axle can be avoided. When installing the wheel axle, it is only necessary to push the transmission end of the wheel axle into the bushing first, adjust the circumferential position of the wheel axle appropriately, align and mesh the splines between the wheel axle and the bushing, and then push the wheel axle into place to complete the installation of the wheel axle. Therefore, the installation and removal of the wheel axle are very convenient and labor-saving, thereby making the drive assembly have the advantages of easy installation and maintenance.

[0008] In the above-mentioned forklift driving assembly, the machine base includes a main arm body and a secondary arm body arranged opposite to the main arm body, a first bearing is fixedly arranged at the lower end of the secondary arm body, and the other end of the wheel axle is supported by the first bearing, and the forklift driving assembly also includes a travel wheel, which is located between the main arm body and the secondary arm body and connected to the middle of the wheel axle. In this design, the travel wheel is installed in the middle of the wheel axle, and the two ends of the wheel axle are supported by the first bearing and the bushing respectively, so that the wheel axle has better installation stability and balance, so that the forklift driving process will be more stable, and the forklift can achieve a higher load capacity.

[0009] In the above-mentioned forklift drive assembly, the end of the wheel axle inserted into the bushing is the transmission end of the wheel axle, and the outer peripheral wall of the wheel axle has a limiting surface facing the transmission end of the wheel axle, and the limiting surface abuts against the inner ring end face of the first bearing. The transmission end of the wheel axle is threadedly connected with a locking nut. When the locking nut is tightened, the locking nut can abut against the bushing along the axial direction to fix the wheel axle axially relative to the bushing. Since the inner ring of the first bearing rotates synchronously with the wheel axle, abutting the limiting surface on the wheel axle against the inner ring end face of the first bearing will not only not affect the normal rotation of the wheel axle, but also can cooperate with the locking nut to achieve the axial fixation of the wheel axle. After removing the locking nut, the wheel axle can be pulled out to achieve the replacement of the wheel axle or the running wheel.

[0010] In the above-mentioned forklift driving assembly, the travel wheel has a cylindrical mounting portion, the middle portion of the wheel axle passes through the mounting portion and is splined to the mounting portion, the outer peripheral wall of the wheel axle has a step surface 1 facing the bushing, the step surface 1 abuts against the mounting portion along the axial direction of the wheel axle, and the adjacent end surfaces of the mounting portion and the bushing abut against each other. Specifically, the step surface 1 abuts against the inner peripheral wall of the mounting portion along the axial direction of the wheel axle. The middle portion of the wheel axle is splined to the mounting portion, so that the wheel axle can rotate synchronously with the travel wheel. The step surface 1 abuts against the inner peripheral wall of the mounting portion along the axial direction of the wheel axle, and the adjacent end surfaces of the mounting portion and the bushing abut against each other, which not only does not affect the normal rotation of the travel wheel, but also can axially fix the mounting portion of the travel wheel, so that the travel wheel has better rotation stability during the driving of the forklift, ensuring that the driving process of the forklift is more stable. Compared with the structure of the prior art that places the travel wheel against the end face of the bearing, the bushing has a better axial load capacity than the bearing, so the bushing can better support the travel wheel bearing, thereby improving the stability and service life of the drive assembly.

[0011] In the above-mentioned forklift drive assembly, the main arm body includes a main body and an annular mounting end cover detachably connected to the side of the main body, one end of the bushing is provided with a bevel gear that rotates synchronously therewith, the bevel gear is rotatably set on the mounting end cover through a second bearing, and the other end of the bushing is rotatably set on the main body through a third bearing.

[0012] Preferably, the mounting end cover is connected to the main body by bolts. This design allows the drive assembly to be assembled by first assembling the bevel gear, the second bearing and the mounting end cover to form a kit, then putting the whole kit on the bushing, and tightening the bolts on the mounting end cover to achieve the assembly of the bevel gear, the second bearing and the bushing, making the assembly and maintenance of the drive assembly more convenient. In addition, in this design, since both ends of the bushing are supported, the bushing can be guaranteed to have good installation stability, thereby stably supporting the wheel shaft to rotate and improving the operating stability of the drive assembly.

[0013] In the forklift drive assembly, the bevel gear has a gear inner hole, one end of the bushing passes through the gear inner hole and is connected to the gear inner hole via a spline. This structure enables the bevel gear to rotate synchronously with the bushing, and the spline connection makes the installation between the bushing and the bevel gear easier.

[0014] In the forklift drive assembly described above, the outer peripheral wall of the bushing near one end of the mounting end cover has a second step surface facing the mounting end cover, and the outer peripheral wall of the other end has a radially protruding annular flange, the second step surface abuts against the inner wall of the gear inner hole along the axial direction of the bushing, and the annular flange abuts against the end surface of the third bearing facing the mounting end cover. This design allows the bushing to be axially fixed after the mounting end cover is installed, thereby stably supporting the wheel shaft to rotate, thereby improving the operating stability of the drive assembly.

[0015] In the above-mentioned forklift driving assembly, the upper end of the main arm body has an extension portion extending in a horizontal direction and located above the traveling wheel, and the upper end of the auxiliary arm body is detachably connected to the extension portion.

[0016] In this drive assembly, the auxiliary arm body and the main arm body are not formed in one piece, but the auxiliary arm body is connected to the main arm body by bolts. This design allows the auxiliary arm body to be installed to support both ends of the wheel axle when the forklift drive assembly is used on a high-load forklift, so that the forklift can reach a higher load capacity. When the forklift drive assembly is used on a lower-load forklift, there is no need to install the auxiliary arm body to achieve the purpose of reducing costs. Therefore, in this drive assembly, without changing the structure of the main arm body and the drive assembly, the forklift drive assembly can meet different load requirements by choosing to install or not install the auxiliary arm body. The structure of the main arm body and the drive assembly in this design is universal, which enables enterprises to reduce manufacturing costs when manufacturing different styles of forklift drive assemblies.

[0017] In the above-mentioned forklift driving assembly, the driving assembly includes a driving motor and a driving shaft, an intermediate shaft and a transmission shaft which are all vertically arranged in the machine base. The driving motor is connected to the driving shaft and can drive the driving shaft to rotate. The driving shaft is provided with a primary driving gear, the upper end of the transmission shaft is provided with a secondary passive gear and the lower end has a bevel gear portion, the intermediate shaft is provided with a primary passive gear meshing with the primary driving gear and a secondary driving gear meshing with the secondary passive gear, and the bevel gear portion meshes with the bevel gear. This structure enables the driving motor to rotate, and in turn drive the bevel gear to rotate through the driving shaft, the intermediate shaft and the transmission shaft, and then drive the bushing and the wheel shaft to rotate synchronously, and finally realize the travel of the forklift.

[0018] In the forklift drive assembly described above, a step surface four is provided on the inner peripheral wall of the bushing, and when the locking nut is tightened, the locking nut can abut against the step surface four along the axial direction.

[0019] In the above-mentioned forklift drive assembly, the end of the wheel axle inserted into the bushing is the transmission end of the wheel axle, and the outer peripheral wall of the wheel axle has a limiting surface facing the transmission end of the wheel axle. The walking wheel has a cylindrical mounting portion, and the wheel axle passes through the mounting portion and is connected to the mounting portion by a spline. The two end surfaces of the mounting portion respectively abut against the limiting surface and the end surface of the bushing facing the walking wheel.

[0020] The middle part of the wheel axle is connected to the mounting part through a spline, so that the wheel axle can rotate synchronously with the travel wheel. The two end faces of the mounting part are respectively against the limit surface and the end face of the bushing facing the travel wheel, which not only does not affect the normal rotation of the travel wheel, but also can axially fix the mounting part of the travel wheel, so that the travel wheel has better rotation stability during the driving process of the forklift, ensuring that the driving process of the forklift is more stable.

[0021] In the forklift drive assembly, the lower end of the auxiliary arm body has a mounting hole, and a protective cover is detachably connected to the side of the auxiliary arm body facing away from the main arm body. The inner wall of the mounting hole has a step surface three facing the direction of the protective cover, and the two end surfaces of the outer ring of the first bearing are respectively against the protective cover and the step surface three. Preferably, the protective cover is connected to the auxiliary arm body by bolts. This design allows the wheel axle and the first bearing to be removed together by removing the protective cover, thereby making the wheel axle removal very convenient.

[0022] In the forklift drive assembly described above, the outer peripheral wall of the wheel axle also has abutment surface facing away from the transmission end of the wheel axle, and the abutment surface abuts against the inner ring end face of the first bearing facing the travel wheel direction. Since the inner ring of the first bearing rotates synchronously with the wheel axle, abutting the abutment surface on the wheel axle against the inner ring end face of the first bearing will not only not affect the normal rotation of the wheel axle, but also can cooperate with the limiting surface to achieve axial fixation of the wheel axle. The design of this structure can make it unnecessary to install a locking nut on the transmission end of the wheel axle. Of course, the transmission end of the wheel axle can also be installed with a locking nut as usual to further improve the stability of the wheel axle fixation.

[0023] Compared with the prior art, the forklift drive assembly has the following advantages:

[0024] 1. When you need to disassemble the axle or running wheel, you only need to remove the protective cover and the cover plate outside the locking nut first, and then remove the locking nut. At this time, the axial fixation of the axle is released, so the axle can be pulled out to achieve the disassembly of the axle or running wheel. Conversely, the axle or running wheel can be installed, and disassembly and installation are very convenient.

[0025] 2. The travel wheel is installed in the middle of the axle, and the two ends of the axle are supported by the first bearing and the bushing respectively, so that the axle has better installation stability and balance, so that the forklift driving process will be more stable, and the forklift can achieve a higher load capacity.

[0026] 3. The auxiliary arm and the main arm are not formed in one piece, but the auxiliary arm is connected to the main arm by bolts. This design allows the drive assembly to meet different load requirements by installing or not installing the auxiliary arm without changing the structure of the main arm and the drive assembly. The structure of the main arm and the drive assembly in this design is universal, which enables enterprises to reduce manufacturing costs when manufacturing different styles of forklift drive assemblies.

[0027] 4. The second bearing and the third bearing are respectively located on both sides of the bevel gear portion on the transmission shaft to support the bushing, so that both ends of the bushing are supported, thereby ensuring that the bushing has good installation stability, and then can stably support the wheel axle for rotation, thereby improving the operating stability of the drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the first embodiment of the forklift drive assembly.

[0029] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0030] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0031] Figure 4 It is a partial cross-sectional view of the first embodiment of the forklift drive assembly.

[0032] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0033] Figure 6 It is a three-dimensional structural diagram of the drive component.

[0034] Figure 7 It is a cross-sectional view of the second embodiment of the forklift drive assembly.

[0035] In the figure, 1, machine base; 1a, main arm body; 1a1, main body; 1a2, mounting end cover; 1a3, extension part; 1b, auxiliary arm body; 1b1, mounting hole; 1b2, step surface three; 2, wheel axle; 21, transmission end; 22, limit surface; 23, step surface one; 24, abutment surface; 3, bushing; 31, internal spline; 32, step surface two; 33, annular flange; 34, step surface four; 4, locking nut; 5, first bearing; 6, walking wheel; 61, mounting part; 7, bevel gear; 71, gear inner hole; 8, second bearing; 9, third bearing; 10, protective cover; 11, drive shaft; 12, intermediate shaft; 13, transmission shaft; 131, bevel gear part; 14, primary driving gear; 15, secondary passive gear; 16, primary passive gear; 17, secondary driving gear; 18, oil seal; 19, locking bolt. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0037] Embodiment 1

[0038] like Figure 1 As shown, the forklift drive assembly includes a base 1, a drive component and a horizontally arranged and circumferentially rotatable wheel axle 2. A bushing 3 is horizontally arranged in the base 1 and is axially fixed relative to the base 1. The drive component is connected to the bushing 3 and can drive the bushing 3 to rotate circumferentially. One end of the wheel axle 2 is detachably inserted into the bushing 3 and is axially fixed relative to the bushing 3. The wheel axle 2 and the bushing 3 are connected by a spline.

[0039] Further, such as Figure 1 As shown, the base 1 includes a main arm body 1a and a secondary arm body 1b arranged opposite to the main arm body 1a, a first bearing 5 is fixedly arranged at the lower end of the secondary arm body 1b, and the other end of the wheel axle 2 is supported by the first bearing 5. The forklift driving assembly also includes a running wheel 6, which is located between the main arm body 1a and the secondary arm body 1b and connected to the middle of the wheel axle 2. Specifically, the upper end of the main arm body 1a has an extension portion 1a3 extending in a horizontal direction and located above the running wheel 6, and the upper end of the secondary arm body 1b is detachably connected to the extension portion 1a3.

[0040] like Figure 1 As shown, the lower end of the auxiliary arm body 1b has a mounting hole 1b1, and a protective cover 10 is detachably connected to the side of the auxiliary arm body 1b facing away from the main arm body 1a. The inner wall of the mounting hole 1b1 has a step surface 1b2 facing the direction of the protective cover 10, and the two end surfaces of the outer ring of the first bearing 5 are respectively abutted against the protective cover 10 and the step surface 1b2.

[0041] like Figure 1As shown, one end of the axle 2 inserted into the bushing 3 is the transmission end 21 of the axle 2. The outer peripheral wall of the axle 2 has a limiting surface 22 facing the transmission end 21 of the axle 2. The limiting surface 22 abuts against the inner ring end surface of the first bearing 5. The end of the transmission end 21 of the axle 2 is threadedly connected with a locking nut 4. When the locking nut 4 is tightened, the locking nut 4 can abut against the bushing 3 along the axial direction so that the axle 2 is axially fixed relative to the bushing 3. The locking nut 4 can be one or two. The specific abutment structure of the locking nut 4 and the bushing 3 is as follows: Figure 3 and Figure 4 As shown, the inner peripheral wall of the bushing 3 is provided with a step surface 4 34, and when the locking nut 4 is tightened, the locking nut 4 can abut against the step surface 4 34 along the axial direction.

[0042] like Figure 1 and Figure 2 As shown, the traveling wheel 6 has a cylindrical mounting portion 61, the middle portion of the wheel axle 2 passes through the mounting portion 61 and is connected to the mounting portion 61 by a spline, the outer peripheral wall of the wheel axle 2 has a step surface 23 facing the bushing 3, the step surface 23 abuts against the mounting portion 61 along the axial direction of the wheel axle 2, and the adjacent end surfaces of the mounting portion 61 and the bushing 3 abut against each other.

[0043] like Figure 4 and Figure 5 As shown, the main arm body 1a includes a main body 1a1 and an annular mounting end cover 1a2 detachably connected to the side of the main body 1a1, one end of the bushing 3 is sleeved with a bevel gear 7 that rotates synchronously therewith, the bevel gear 7 is rotatably mounted on the mounting end cover 1a2 via a second bearing 8, and the other end of the bushing 3 is rotatably mounted on the main body 1a1 via a third bearing 9. The bevel gear 7 has a gear inner hole 71, and one end of the bushing 3 passes through the gear inner hole 71 and is connected to the gear inner hole 71 via a spline.

[0044] like Figures 3 to 5 As shown, the outer peripheral wall of the bushing 3 near the mounting end cover 1a2 has a second step surface 32 facing the mounting end cover 1a2, and the outer peripheral wall of the other end has a radially protruding annular flange 33, the second step surface 32 abuts against the inner wall of the gear inner hole 71 along the axial direction of the bushing 3, and the annular flange 33 abuts against the end surface of the third bearing 9 facing the mounting end cover 1a2. This design allows the bushing 3 to be axially fixed after the mounting end cover 1a2 is installed, thereby being able to stably support the wheel shaft 2 for rotation, thereby improving the operating stability of the drive assembly.

[0045] like Figure 4 and Figure 6As shown, the driving assembly includes a driving motor and a driving shaft 11, an intermediate shaft 12 and a transmission shaft 13 which are all vertically arranged in the machine base 1. The driving motor is connected to the driving shaft 11 and can drive the driving shaft 11 to rotate. The driving shaft 11 is provided with a primary driving gear 14. The upper end of the transmission shaft 13 is provided with a secondary passive gear 15 and the lower end has a bevel gear portion 131. The intermediate shaft 12 is provided with a primary passive gear 16 meshing with the primary driving gear 14 and a secondary driving gear 17 meshing with the secondary passive gear 15. The bevel gear portion 131 meshes with the bevel gear 7. This structure enables the driving motor to rotate, and can drive the bevel gear 7 to rotate through the driving shaft 11, the intermediate shaft 12 and the transmission shaft 13 in sequence, thereby driving the bushing 3 and the wheel shaft 2 to rotate synchronously, and finally realizing the travel of the forklift.

[0046] When the wheel axle 2 or the running wheel 6 needs to be disassembled, Figure 1 As shown, first remove the protective cover 10 and the cover plate outside the locking nut 4, and then remove the locking nut 4. At this time, the axial fixation of the axle 2 is released, so the axle 2 can be pulled out to achieve the removal of the axle 2 or the running wheel 6. On the contrary, the axle 2 or the running wheel 6 can be installed, and the removal and installation are very convenient.

[0047] Embodiment 2

[0048] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 7 As shown, one end of the axle 2 inserted into the bushing 3 is the transmission end 21 of the axle 2. The outer peripheral wall of the axle 2 has a limiting surface 22 facing the transmission end 21 of the axle 2. The running wheel 6 has a cylindrical mounting portion 61. The axle 2 passes through the mounting portion 61 and is connected to the mounting portion 61 by a spline. The two end surfaces of the mounting portion 61 respectively abut against the limiting surface 22 and the end surface of the bushing 3 facing the running wheel 6. The outer peripheral wall of the axle 2 also has an abutting surface 24 facing away from the transmission end 21 of the axle 2. The abutting surface 24 abuts against the inner ring end surface of the first bearing 5 facing the running wheel 6.

[0049] The design of this structure can make the transmission end 21 of the wheel shaft 2 not need to be installed with the locking nut 4. Of course, the transmission end 21 of the wheel shaft 2 can also be installed with the locking nut 4 as usual to further improve the stability of the wheel shaft 2 fixation.

[0050] When the wheel axle 2 or the running wheel 6 needs to be disassembled, Figure 7 As shown, the protective cover 10 is first removed. At this time, since the axial fixation of the first bearing 5 is released, the wheel axle 2 and the first bearing 5 can be pulled out to realize the removal of the wheel axle 2 or the running wheel 6. On the contrary, the wheel axle 2 or the running wheel 6 can be installed, and the removal and installation are very convenient.

[0051] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0052] Although this article uses more 1, machine base; 1a, main arm body; 1a1, main body; 1a2, mounting end cover; 1a3, extension; 1b, auxiliary arm body; 1b1, mounting hole; 1b2, step surface three; 2, axle; 21, transmission end; 22, limit surface; 23, step surface one; 24, abutment surface; 3, bushing; 31, internal spline; 32, step surface two; 33, annular flange; 34, step surface four; 4, locking nut; 5, first The following terms are used herein, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A forklift drive assembly, comprising a base (1), a drive assembly and a horizontally arranged and circumferentially rotatable wheel axle (2), characterized in that: A bushing (3) is horizontally arranged in the machine base (1) and is axially fixed relative to the machine base (1); the driving assembly is connected to the bushing (3) and can drive the bushing (3) to rotate circumferentially; one end of the wheel axle (2) is detachably inserted into the bushing (3) and is axially fixed relative to the bushing (3); the wheel axle (2) and the bushing (3) are connected via a spline.

2. The forklift drive assembly according to claim 1, characterized in that: The machine base (1) comprises a main arm body (1a) and a secondary arm body (1b) arranged opposite to the main arm body (1a); a first bearing (5) is fixedly arranged at the lower end of the secondary arm body (1b); the other end of the wheel axle (2) is supported by the first bearing (5); the forklift driving assembly also comprises a running wheel (6); the running wheel (6) is located between the main arm body (1a) and the secondary arm body (1b) and is connected to the middle of the wheel axle (2).

3. The forklift drive assembly according to claim 2, characterized in that: The end of the wheel axle (2) inserted into the bushing (3) is the transmission end (21) of the wheel axle (2). The outer peripheral wall of the wheel axle (2) has a limiting surface (22) facing the transmission end (21) of the wheel axle (2). The limiting surface (22) abuts against the inner ring end surface of the first bearing (5). The end of the transmission end (21) of the wheel axle (2) is threadedly connected with a locking nut (4). When the locking nut (4) is tightened, the locking nut (4) can abut against the bushing (3) along the axial direction so that the wheel axle (2) is axially fixed relative to the bushing (3).

4. The forklift drive assembly according to claim 3, characterized in that: The travel wheel (6) has a cylindrical mounting portion (61), the middle portion of the wheel axle (2) passes through the mounting portion (61) and is connected to the mounting portion (61) via a spline, the outer peripheral wall of the wheel axle (2) has a step surface (23) facing the bushing (3), the step surface (23) abuts against the mounting portion (61) along the axial direction of the wheel axle (2), and the adjacent end surfaces of the mounting portion (61) and the bushing (3) abut against each other.

5. The forklift drive assembly according to claim 2, 3 or 4, characterized in that: The main arm body (1a) comprises a main body (1a1) and an annular mounting end cover (1a2) detachably connected to the side of the main body (1a1); one end of the bushing (3) is sleeved with a bevel gear (7) that rotates synchronously therewith; the bevel gear (7) is rotatably mounted on the mounting end cover (1a2) via a second bearing (8); the other end of the bushing (3) is rotatably mounted on the main body (1a1) via a third bearing (9).

6. The forklift drive assembly according to claim 5, characterized in that: The bevel gear (7) has a gear inner hole (71), and one end of the bushing (3) passes through the gear inner hole (71) and is connected to the gear inner hole (71) via a spline.

7. The forklift drive assembly according to claim 6, characterized in that: The outer peripheral wall of one end of the bushing (3) close to the mounting end cover (1a2) has a second step surface (32) facing the mounting end cover (1a2), and the outer peripheral wall of the other end has a radially protruding annular flange (33), the second step surface (32) abuts against the inner wall of the gear inner hole (71) along the axial direction of the bushing (3), and the annular flange (33) abuts against the end face of the third bearing (9) facing the mounting end cover (1a2).

8. The forklift drive assembly according to claim 2, characterized in that: One end of the wheel axle (2) inserted into the bushing (3) is the transmission end (21) of the wheel axle (2); the outer peripheral wall of the wheel axle (2) is provided with a limiting surface (22) facing the transmission end (21) of the wheel axle (2); the running wheel (6) has a cylindrical mounting portion (61); the wheel axle (2) passes through the mounting portion (61) and is connected to the mounting portion (61) via a spline; the two end surfaces of the mounting portion (61) respectively abut against the limiting surface (22) and the end surface of the bushing (3) facing the running wheel (6).

9. The forklift drive assembly according to claim 8, characterized in that: The lower end of the auxiliary arm body (1b) is provided with a mounting hole (1b1); a protective cover (10) is detachably connected to the side of the auxiliary arm body (1b) facing away from the main arm body (1a); the inner wall of the mounting hole (1b1) is provided with a step surface three (1b2) facing the direction of the protective cover (10); and the two end surfaces of the outer ring of the first bearing (5) are respectively in contact with the protective cover (10) and the step surface three (1b2).

10. The forklift drive assembly according to claim 9, characterized in that: The outer peripheral wall of the wheel axle (2) also has a contact surface (24) facing away from the transmission end (21) of the wheel axle (2), and the contact surface (24) contacts the inner ring end surface of the first bearing (5) facing the running wheel (6).

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