Forklift driving assembly

Abstract

The utility model 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 and a wheel axle which is horizontally arranged and can rotate in the circumferential direction, one end of the wheel axle is connected with a walking wheel, a transmission shaft with a conical tooth part at the lower end is vertically arranged in the machine base, a lining axially fixed relative to the machine base is further horizontally arranged in the machine base, and the other end of the wheel axle is fixedly inserted into the lining. One end of the bushing is sleeved with a bevel gear which rotates synchronously with the bushing, the bevel tooth part is meshed with the bevel gear, and the other end of the bushing and the bevel gear are rotationally arranged on the machine base through bearings respectively. 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] This utility model belongs to the field of forklift technology and relates to a forklift drive assembly. Background Technology

[0002] Electric forklifts, as essential equipment in modern warehousing and logistics, have gradually replaced traditional internal combustion forklifts due to their environmental friendliness, economy, and high efficiency. The drive assembly is the core component of an electric forklift, primarily responsible for power transmission and control; its design directly impacts the forklift's performance and reliability.

[0003] A forklift drive assembly typically includes a base and a drive motor, power transmission components, axles, and wheels mounted on the base. In conventional technology, bearings and gears are usually directly mounted on the axles to achieve mounting and power transmission. For example, a Chinese patent document discloses an integrated heavy-duty vertical drive wheel with dual coaxial motors and an unmanned forklift using it (application number: 202310779465.0), which includes a frameless torque motor, a long drive shaft, a primary input gear, a primary output gear, a secondary orthogonal input gear, and a secondary orthogonal output gear. The primary input gear is coaxially fixedly connected to the end of the long drive shaft; the primary input gear meshes with the primary output gear; the secondary orthogonal output gear meshes orthogonally with the secondary orthogonal input gear; and the rollers and the secondary orthogonal output gear are coaxially fixedly connected via a wheel core. This structure has the following shortcomings in practical use:

[0004] In this structure, although two paired tapered roller bearings are provided on the outer shell to support the wheel core, the axial length of the two tapered roller bearings is limited, so the support area and support effect on the wheel core are limited. Moreover, when the forklift is heavily loaded, the external force applied by the rollers to the wheel core acts on the end of the wheel core, while the two paired tapered roller bearings only support the middle of the wheel core, and the end of the wheel core lacks effective support. Therefore, this structure results in insufficient stability and balance of the wheel core when the forklift is heavily loaded. After the forklift has been used for a long time, the wheel core is prone to vertical movement at both ends, which affects the operating stability of the forklift drive assembly. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a forklift drive assembly that solves the problem of insufficient operational stability in existing forklift drive assemblies.

[0006] The objective of this utility model can be achieved through the following technical solution: A forklift drive assembly includes a base and a horizontally arranged axle that can rotate circumferentially. One end of the axle is connected to a travel wheel. A transmission shaft with a beveled tooth at its lower end is vertically arranged inside the base. The characteristic feature is that a bushing that is axially fixed relative to the base is also horizontally arranged inside the base. The other end of the axle is fixedly inserted into the bushing. A bevel gear that rotates synchronously with the bushing is sleeved on one end of the bushing. The beveled tooth meshes with the bevel gear. The other end of the bushing and the bevel gear are rotatably mounted on the base through bearings.

[0007] When the drive shaft rotates, it can drive the bevel gear to rotate through the bevel tooth section. At this time, since the bushing rotates synchronously with the bevel gear, and one end of the wheel axle is fixedly inserted into the bushing, when the bevel gear rotates, both the bushing and the shaft can rotate synchronously with the bevel gear, thereby realizing the movement of the forklift.

[0008] In this forklift drive assembly, an additional bushing is added within the base. This bushing provides a larger support area between the axle and the bushing, enhancing the bushing's support for the axle and preventing vertical movement of the axle during forklift operation. Furthermore, the bushing is supported at both ends by bevel gears and bearings, ensuring good stability during rotation. This allows the bushing to stably support the axle's rotation, further improving the stability of the forklift drive assembly and resulting in more stable forklift operation.

[0009] In the forklift drive assembly described above, the axle is inserted into the bushing at one end as the inner end and the other end as the outer end. The axle and the bushing are connected by a spline. The outer peripheral wall of the axle has a limiting surface facing the inner end of the axle. The limiting surface abuts against the end face of the bushing facing the traveling wheel. The inner end of the axle is threaded with a locking nut. When the locking nut is tightened, it abuts against the bushing axially, thus fixing the axle axially relative to the bushing.

[0010] In this drive assembly, after tightening the locking nut, the locking nut can abut against the bushing along the axial direction, and at the same time, the limiting surface on the wheel axle abuts against the end face of the bushing facing the traveling wheel, thereby achieving axial fixation of the wheel axle in the machine base. By removing the locking nut, the wheel axle can be pulled out to replace the wheel axle or the traveling wheel.

[0011] In this structure, the bushing and the axle are connected by a spline, allowing the bushing to drive the axle to rotate synchronously, thus eliminating the need for gears on the axle for power transmission. Therefore, the bushing acts as an intermediary, separating the axle from the gearbox. This eliminates the need to disassemble the gearbox when removing the axle, preserving the installation and alignment of the gears within the gearbox. Furthermore, installing the axle does not require moving or adjusting the position of the gears within the gearbox, making the installation and removal of the axle extremely convenient.

[0012] Furthermore, since the inner end of the axle extends into the bushing and is supported by the bushing, the problem of high friction during axle disassembly, which would have been caused by a bearing mounted on the inner end of the axle, is avoided. When installing the axle, simply push the inner end of the axle into the bushing, adjust the circumferential position of the axle appropriately to align and engage the splines between the axle and the bushing, then push the axle into place, and finally tighten the locking nut on the inner end of the axle to complete the installation. Therefore, the installation and disassembly of the axle are very convenient and effortless, giving this drive assembly the advantage of easy installation and maintenance.

[0013] In the forklift drive assembly described above, the base includes a main body and an annular mounting end cover detachably connected to the side of the main body. A bearing supporting the bevel gear is mounted on the mounting end cover. This design allows the drive assembly to be assembled by first assembling the bevel gear, bearing, and mounting end cover into a single unit, then fitting the entire assembly onto the bushing and tightening the bolts on the mounting end cover. This simplifies the assembly and maintenance of the drive assembly.

[0014] In the forklift drive assembly described above, the mounting end cap is fixedly connected to the main body by bolts.

[0015] In the forklift drive assembly described above, the bevel gear has an inner bore, and one end of the bushing passes through this inner bore and is connected to it via a spline. This structure allows the bevel gear to rotate synchronously with the bushing, while the spline connection simplifies the installation between the bushing and the bevel gear.

[0016] In the forklift drive assembly described above, the inner peripheral wall of the bushing has a stepped surface. When the locking nut is tightened, the locking nut abuts against the stepped surface axially. When the locking nut is tightened, it abuts against the stepped surface, and simultaneously, the limiting surface on the outer peripheral wall of the axle abuts against the end face of the bushing. This not only does not affect the normal rotation of the axle, but also achieves axial fixation of the axle through the locking action of the locking nut.

[0017] In the forklift drive assembly described above, the bushing has a stepped surface two on its outer peripheral wall near the mounting end cover, facing the mounting end cover. The other end has a radially protruding annular flange on its outer peripheral wall. The stepped surface two abuts against the inner wall of the gear bore along the axial direction of the bushing. A bearing located at the other end of the bushing is situated outside the annular flange, and its end face facing the mounting end cover abuts against the annular flange. This design allows the bushing to be axially fixed after the mounting end cover is installed, thereby stably supporting the rotation of the axle and improving the operational stability of the drive assembly.

[0018] In the forklift drive assembly described above, the top of the main body has a gear chamber, in which a drive shaft and an intermediate shaft are vertically arranged. The main body is equipped with a drive motor connected to and capable of rotating the drive shaft. The drive shaft has a primary drive gear, and the intermediate shaft has a primary driven gear meshing with the primary drive gear and a secondary drive gear meshing with the secondary driven gear. This structure allows the drive motor to rotate, sequentially driving the bevel gears through the drive shaft, intermediate shaft, and transmission shaft, thereby synchronously rotating the bushings and axles, ultimately enabling the forklift to move.

[0019] In the forklift drive assembly described above, the outer end of the axle has a flange, and the traveling wheel is fixedly connected to the flange. By providing the flange, the installation of the traveling wheel can be facilitated and installation stability can be ensured. Preferably, the traveling wheel is connected to the flange by fastening bolts.

[0020] Compared with existing technologies, this forklift drive assembly has the following advantages:

[0021] 1. When it is necessary to disassemble the axle or the wheel, simply remove the locking nut. This releases the axial fixation of the axle, allowing it to be pulled out and the wheel or wheel to be disassembled. Conversely, the axle or wheel can be installed. Disassembly and installation are very convenient.

[0022] 2. The two bearings are located on both sides of the bevel gear on the drive shaft to support the bushing, so that both ends of the bushing are supported. This ensures that the bushing has good installation stability, and thus can stably support the wheel axle to rotate, improving the operating stability of the drive assembly. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the forklift drive assembly.

[0024] Figure 2 This is a partial sectional view of the forklift drive assembly.

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 This is a three-dimensional structural diagram of the power transmission components in the drive assembly of this forklift.

[0027] In the diagram, 1 is the base; 1a is the main body; 1a1 is the gear chamber; 1b is the mounting end cover; 2 is the wheel axle; 21 is the limiting surface; 22 is the flange; 3 is the drive shaft; 31 is the bevel gear; 4 is the bushing; 41 is the first stepped surface; 42 is the second stepped surface; 43 is the annular flange; 5 is the traveling wheel; 6 is the bevel gear; 61 is the gear inner hole; 7 is the bearing; 8 is the locking nut; 9 is the bolt; 10 is the drive shaft; 11 is the intermediate shaft; 12 is the first-stage driving gear; 13 is the second-stage driven gear; 14 is the first-stage driven gear; and 15 is the second-stage driving gear. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0029] like Figure 1 As shown, the forklift drive assembly includes a base 1 and a horizontally arranged, circumferentially rotatable axle 2. A drive shaft 3 with a bevel gear 31 at its lower end is vertically arranged within the base 1. A bushing 4, axially fixed relative to the base 1, is also horizontally arranged within the base 1. One end of the axle 2 is fixedly inserted into the bushing 4, forming the inner end of the axle 2, while the other end forms the outer end. The outer end of the axle 2 has a flange 22, and the traveling wheels 5 are fixedly connected to the flange 22 by fastening bolts. A bevel gear 6, rotating synchronously with the bushing 4, is fitted onto one end of the bushing 4. The bevel gear 31 meshes with the bevel gear 6. The other end of the bushing 4 and the bevel gear 6 are rotatably mounted on the base 1 via bearings 7.

[0030] Specifically, such as Figure 1 As shown, the axle 2 and bushing 4 are connected by a spline. The outer peripheral wall of the axle 2 has a limiting surface 21 facing the inner end of the axle 2. The limiting surface 21 abuts against the end face of the bushing 4 facing the traveling wheel 5. The inner end of the axle 2 is threaded with a locking nut 8. The inner peripheral wall of the bushing 4 has a stepped surface 41. When the locking nut 8 is tightened, it abuts against the stepped surface 41 axially, thereby fixing the axle 2 axially relative to the bushing 4. In this drive assembly, after tightening the locking nut 8, it abuts against the bushing 4 axially, and the limiting surface 21 on the axle 2 abuts against the end face of the bushing 4 facing the traveling wheel 5, thus fixing the axle 2 axially within the base 1. By removing the locking nut 8, the axle 2 can be pulled out, allowing the axle 2 or the traveling wheel 5 to be replaced.

[0031] like Figure 1 and Figure 2As shown, the base 1 includes a main body 1a and an annular mounting end cover 1b detachably connected to the side of the main body 1a. A bearing 7 supporting the bevel gear 6 is mounted on the mounting end cover 1b of the base 1. Specifically, the mounting end cover 1b is fixedly connected to the main body 1a by bolts 9. Figure 3 As shown, the bevel gear 6 has a gear inner hole 61, and one end of the bushing 4 passes through the gear inner hole 61 and is connected to the gear inner hole 61 by a spline. This structure allows the bevel gear 6 to rotate synchronously with the bushing 4, and the spline connection makes the installation between the bushing 4 and the bevel gear 6 simpler.

[0032] like Figure 2 and Figure 3 As shown, the bushing 4 has a stepped surface 42 on its outer peripheral wall near the mounting end cover 1b, facing the mounting end cover 1b. The other end has a radially protruding annular flange 43 on its outer peripheral wall. The stepped surface 42 abuts against the inner wall of the gear bore 61 along the axial direction of the bushing 4. The bearing 7 at the other end of the bushing 4 is located outside the annular flange 43, and its end face facing the mounting end cover 1b abuts against the annular flange 43. This design allows the bushing 4 to be axially fixed after the mounting end cover 1b is installed, thereby stably supporting the rotation of the wheel axle 2 and improving the operational stability of the drive assembly.

[0033] like Figure 1 and Figure 4 As shown, the top of the main body 1a has a gear chamber 1a1. A drive shaft 10 and an intermediate shaft 11 are vertically arranged inside the gear chamber 1a1. The main body 1a is equipped with a drive motor connected to the drive shaft 10 and capable of driving the drive shaft 10 to rotate. The drive motor is not shown in the figure. The drive shaft 10 has a primary drive gear 12, and the intermediate shaft 11 has a primary driven gear 14 meshing with the primary drive gear 12 and a secondary drive gear 15 meshing with the secondary driven gear 13. This structure allows the drive motor to rotate, sequentially driving the bevel gear 6 through the drive shaft 10, intermediate shaft 11, and transmission shaft 3, thereby driving the bushing 4 and the axle 2 to rotate synchronously, ultimately enabling the forklift to move.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] Although this document frequently uses terms such as 1. base; 1a. main body; 1a1. gear chamber; 1b. mounting end cover; 2. axle; 21. limiting surface; 22. flange; 3. drive shaft; 31. bevel gear; 4. bushing; 41. step surface one; 42. step surface two; 43. annular flange; 5. traveling wheel; 6. bevel gear; 61. gear inner hole; 7. bearing; 8. locking nut; 9. bolt; 10. drive shaft; 11. intermediate shaft; 12. first-stage driving gear; 13. second-stage driven gear; 14. first-stage driven gear; 15. second-stage driving gear, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A forklift drive assembly, comprising a base (1) and a horizontally arranged, circumferentially rotatable axle (2), one end of which is connected to a travel wheel (5), and a drive shaft (3) with a beveled tooth portion (31) at its lower end is vertically arranged within the base (1), characterized in that, The base (1) is also horizontally provided with a bushing (4) that is axially fixed relative to the base (1). The other end of the axle (2) is fixedly inserted into the bushing (4). One end of the bushing (4) is fitted with a bevel gear (6) that rotates synchronously with it. The bevel tooth part (31) meshes with the bevel gear (6). The other end of the bushing (4) and the bevel gear (6) are rotatably mounted on the base (1) through bearings (7).

2. The forklift drive assembly according to claim 1, characterized in that, The axle (2) is inserted into the bushing (4) at one end as the inner end and at the other end as the outer end. The axle (2) and the bushing (4) are connected by a spline. The outer peripheral wall of the axle (2) has a limiting surface (21) facing the inner end of the axle (2). The limiting surface (21) abuts against the end face of the bushing (4) facing the traveling wheel (5). The inner end of the axle (2) is threaded with a locking nut (8). When the locking nut (8) is tightened, the locking nut (8) abuts against the bushing (4) axially, so that the axle (2) is axially fixed relative to the bushing (4).

3. The forklift drive assembly according to claim 1, characterized in that, The base (1) includes a main body (1a) and an annular mounting end cover (1b) detachably connected to the side of the main body (1a). A bearing (7) supporting the bevel gear (6) is disposed on the mounting end cover (1b) of the base (1).

4. The forklift drive assembly according to claim 3, characterized in that, The mounting end cap (1b) is fixedly connected to the main body (1a) by bolts (9).

5. The forklift drive assembly according to claim 3, characterized in that, The bevel gear (6) has a gear inner hole (61), and one end of the bushing (4) passes through the gear inner hole (61) and is connected to the gear inner hole (61) by a spline.

6. The forklift drive assembly according to claim 2, characterized in that, The bushing (4) has a stepped surface (41) on its inner peripheral wall. When the locking nut (8) is tightened, the locking nut (8) can abut against the stepped surface (41) along the axial direction.

7. The forklift drive assembly according to claim 5, characterized in that, The bushing (4) has a stepped surface (42) on its outer peripheral wall near the mounting end cover (1b) facing the mounting end cover (1b), and a radially protruding annular flange (43) on its outer peripheral wall at the other end. The stepped surface (42) abuts against the inner wall of the gear inner hole (61) along the axial direction of the bushing (4). The bearing (7) located at the other end of the bushing (4) is located outside the annular flange (43), and the end face of the bearing (7) facing the mounting end cover (1b) abuts against the annular flange (43).

8. The forklift drive assembly according to claim 3, characterized in that, The top of the main body (1a) has a gear chamber (1a1), in which a drive shaft (10) and an intermediate shaft (11) are vertically arranged. The main body (1a) is provided with a drive motor that is connected to the drive shaft (10) and can drive the drive shaft (10) to rotate. The drive shaft (10) is provided with a first-stage driving gear (12). The upper end of the transmission shaft (3) is provided with a second-stage driven gear (13). The intermediate shaft (11) is provided with a first-stage driven gear (14) that meshes with the first-stage driving gear (12) and a second-stage driving gear (15) that meshes with the second-stage driven gear (13).

9. The forklift drive assembly according to claim 2, characterized in that, The outer end of the axle (2) has a flange (22), and the walking wheel (5) is fixedly connected to the flange (22).

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