Electrically driven wheel for a fork lift truck

Abstract

The utility model provides a kind of forklift electric drive wheel belongs to forklift technical field.It solves the problem of not applying two tooth difference reduction drive to forklift electric drive wheel.The forklift electric drive wheel includes drive frame, rubber wheel, driving motor, with one input shaft, multiple output pin shaft, two planetary gear and one inner tooth ring two tooth difference reduction drive assembly;Driving motor is located in the side of rubber wheel, two tooth difference reduction drive assembly is located in the other side of rubber wheel;Input shaft is connected with drive frame, and input shaft is connected with main shaft by key;Two planetary gear and two eccentric shaft part are one-to-one corresponding rotation connection, inner tooth ring is fixedly connected with drive frame, two planetary gear are engaged with inner tooth ring, and multiple output pin shaft is fixedly connected with wheel axle.The forklift electric drive wheel uses two tooth difference reduction drive assembly to reduce, with the advantage of high transmission ratio, and the forklift electric drive wheel also has the advantage of compact structure.

Description

Technical Field

[0001] This utility model belongs to the field of forklift technology, and in particular relates to an electric drive wheel for forklifts. Background Technology

[0002] Forklifts are various wheeled handling vehicles used for loading, unloading, stacking, and short-distance transportation of palletized goods. Electric forklifts are typically powered by batteries and driven by electric motors, offering advantages such as energy efficiency, environmental friendliness, and low operating and maintenance costs, leading to their widespread use in industries such as warehousing, tobacco, and textiles.

[0003] Electric drive wheels for forklifts typically not only bear loads but also provide driving force and assist steering, making them a core component of electric forklifts. There is considerable literature on electric drive wheels for forklifts, such as the electric forklift drive wheel assembly described in Chinese patent literature (application number 201420788659.3), which includes components such as a drive frame, drive motor, rubber-coated wheels, gears, and drive shaft. Other examples include an electric forklift drive wheel (application number 201910036802.0) and an electric forklift drive wheel assembly (application number 202220829243.6). In short, the choice of reduction gear structure and its specific structural arrangement directly determines the performance and manufacturing cost of the electric drive wheels for forklifts.

[0004] Two-tooth differential speed reducers have advantages such as high reduction ratio and compact structure. For example, a planetary cycloidal pinwheel reducer described in Chinese patent literature (application number 200520026486.2) includes components such as an eccentric bearing, two cycloidal wheels, a pin shaft, a pin tooth pin, and a pin tooth housing. However, two-tooth differential speed reducers have not yet been applied to the electric drive wheels of forklifts. Summary of the Invention

[0005] This utility model proposes an electric drive wheel for forklifts. The technical problem to be solved by this utility model is how to propose an electric drive wheel for forklifts that uses a two-tooth differential reduction transmission.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution: A forklift electric drive wheel includes a drive frame, a rubber-coated wheel, and a drive motor; the rubber-coated wheel includes a rubber wheel and an axle, and the axle is connected to the drive frame through a first bearing; the drive motor is located on one side of the rubber-coated wheel, and the drive motor includes a stator, a rotor, and a main shaft, the stator is fixedly connected to the drive frame, and the main shaft is connected to the drive frame through a second bearing; characterized in that the forklift electric drive wheel further includes a two-tooth differential reduction transmission assembly having an input shaft, multiple output pins, two planetary gears, and an internal gear ring. The two-tooth differential reduction transmission assembly is located on the other side of the rubber-coated wheel. The input shaft is connected to the drive frame via a third bearing. One end of the input shaft passes through the wheel axle, and the other end of the input shaft is connected to the main shaft via a key. The input shaft has two eccentric shaft sections, and two planetary teeth are rotatably connected to the two eccentric shaft sections in a one-to-one correspondence. The internal gear ring is fixedly connected to the drive frame. Both planetary teeth mesh with the internal gear ring. Multiple pin holes are opened on both planetary teeth. Multiple output pins are correspondingly passed through the multiple pin holes of the two planetary teeth, and the multiple output pins are fixedly connected to the wheel axle.

[0007] When the motor of the electric drive wheel of the forklift is running, the main shaft drives the input shaft to rotate. The eccentric shaft of the input shaft rotates, which forces the two planetary teeth to revolve around the center of the internal gear ring. At the same time, the planetary teeth will rotate due to meshing. In turn, the planetary teeth drive the output pin to rotate around the center of the internal gear ring, thereby driving the wheel shaft to rotate. The rotation speed of the wheel shaft is much lower than the rotation speed of the input shaft.

[0008] Compared to existing technologies, this forklift's electric drive wheel uses a two-tooth differential reduction transmission assembly for speed reduction, offering the advantage of a high transmission ratio. The attached diagram in the manual shows a transmission ratio as high as 30, which can be adjusted based on actual conditions, including the number of teeth and the transmission ratio. Compared to existing electric drive wheels with the same transmission ratio, this forklift's electric drive wheel not only boasts the advantage of high motor efficiency, thus extending the forklift's travel range, but also features a compact structure, reducing the space occupied by the electric drive wheel within the forklift.

[0009] In the aforementioned electric drive wheel for forklift, the drive frame includes a main frame and side plates. The main frame further includes an upright plate, a flat plate, and a connecting pipe. The flat plate and side plates of the main frame are fixedly connected by bolts, and a wheel mounting cavity is formed between the side plates and the upright plate of the main frame. The rubber wheel is located inside the wheel mounting cavity.

[0010] In the aforementioned electric drive wheel for forklift, the drive motor also includes a housing, which is sealed and fixedly connected to the side plate. One end of the main shaft is connected to the side plate via a second bearing, and the other end of the main shaft is connected to the housing via a second bearing. The stator is fixedly connected to the cylindrical part.

[0011] In the aforementioned electric drive wheel for forklift, the upright plate has a reduction assembly mounting cavity, and the drive frame also includes a cover plate for sealing the opening of the reduction assembly mounting cavity, the cover plate being fixedly connected to the upright plate; the two-tooth differential reduction transmission assembly is located inside the reduction assembly mounting cavity.

[0012] In the aforementioned electric drive wheel for forklift, the axle is tubular, and one end of the input shaft is connected to the axle via a fourth bearing.

[0013] In the aforementioned electric drive wheel for the forklift, the two eccentric shafts are symmetrically arranged with respect to the center line X of the input shaft. The planetary gears are rotatably connected to the eccentric shafts via a fifth bearing, and the two planetary gears are also symmetrically arranged with respect to the center line X of the input shaft.

[0014] In the aforementioned electric drive wheel for forklifts, the pin hole is located in the middle of the planetary gear, and multiple pin holes are evenly distributed circumferentially around the center line of the planetary gear. The multiple pin holes on the two planetary gears are set one-to-one.

[0015] In the aforementioned electric drive wheel for forklift, a bushing is fitted onto the output pin, and the output pin contacts the side of the pin hole through the bushing.

[0016] In the aforementioned electric drive wheel for forklifts, one end of the wheel axle is a connecting disc, and one end of multiple output pins is fixedly connected to the connecting disc by riveting. Attached Figure Description

[0017] Figure 1 and Figure 2 This is a 3D structural diagram of the electric drive wheel of a forklift from different perspectives.

[0018] Figure 3 This is a side view of the electric drive wheel of a forklift.

[0019] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure of AA.

[0020] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of BB.

[0021] Figure 6 yes Figure 5 A schematic diagram of the cross-sectional structure of CC.

[0022] Figure 7 This is an exploded structural diagram of a two-tooth differential speed reduction transmission assembly.

[0023] In the diagram, 10 is the drive frame; 11 is the main frame; 11a is the upright plate; 11b is the flat plate; 11c is the connecting pipe; 12 is the side plate; 13 is the cover plate; 14 is the bolt; 15 is the wheel mounting cavity; 16 is the reduction assembly mounting cavity; 20 is the rubber-coated wheel; 21 is the rubber wheel; 22 is the wheel axle; 22a is the connecting disc; 23 is the wheel rim; 30 is the drive motor; 31 is the stator; 32 is the rotor; 33 is the main shaft; 34 is the housing; 34a is the cylindrical part; 34b is the right end cover; 40 is the two-tooth differential reduction transmission assembly; 41 is the input shaft; 41a is the eccentric shaft; 42 is the output pin; 43 is the planetary gear; 43a is the pin hole; 44 is the internal gear ring; 45 is the bushing; 1 is the first bearing; 2 is the second bearing; 3 is the third bearing; 4 is the fourth bearing; 5 is the fifth bearing. Detailed Implementation

[0024] 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.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] like Figures 1 to 4 As shown, the electric drive wheel of the forklift includes a drive frame 10, rubber-coated wheels 20, a drive motor 30, and a two-tooth differential reduction transmission assembly 40.

[0030] The drive frame 10 includes a main frame 11, side plates 12, and a cover plate 13. The main frame 11 further includes a vertical plate portion 11a, a flat plate portion 11b, and a connecting pipe portion 11c. The flat plate portion 11b of the main frame 11 and the side plate 12 are fixedly connected by bolts 14. A wheel mounting cavity 15 is formed between the side plate 12 and the vertical plate portion 11a of the main frame 11. The vertical plate portion 11a has a reduction gear assembly mounting cavity 16. The cover plate 13 is used to cover the opening of the reduction gear assembly mounting cavity 16, and the cover plate 13 is fixedly connected to the vertical plate portion 11a.

[0031] The rubber-coated wheel 20 includes a rubber wheel 21, an axle 22, and a rim 23. The rubber wheel 21 is located inside the wheel mounting cavity 15. One end of the axle 22 is connected to the upright plate 11a of the main frame 11 via a first bearing 1, and the other end of the axle 22 is connected to the side plate 12 via a first bearing 1. This arrangement has the advantage of high load-bearing capacity, and the rubber wheel 21 and rim 23 can still be quickly replaced by disassembling the side plate 12, thus providing the advantage of convenient replacement of the rubber wheel 21 and rim 23 assembly.

[0032] The drive motor 30 is located on one side of the rubber-coated wheel 20. The drive motor 30 includes a stator 31, a rotor 32, a main shaft 33, and a housing 34. The housing 34 includes a cylindrical portion 34a and a right end cover portion 34b. One end of the cylindrical portion 34a is sealed and fixedly connected to the side plate 12, and the other end of the right end cover portion 34b is sealed and fixedly connected to the cylindrical portion 34a. In other words, the left end cover portion of the housing 34 is integrated with the side plate 12. One end of the main shaft 33 is connected to the side plate 12 via a second bearing 2, and the other end of the main shaft 33 is connected to the right end cover portion 34b via a second bearing 2. The stator 31 is fixedly connected to the cylindrical portion 34a, and the rotor 32 is fixedly connected to the main shaft 33.

[0033] like Figures 4 to 7 As shown, the two-tooth differential speed reduction transmission assembly 40 is located within the speed reduction assembly mounting cavity 16 and is situated on the other side of the rubber-coated wheel 20. The two-tooth differential speed reduction transmission assembly 40 has an input shaft 41, multiple output pins 42, two planetary teeth 43, and an internal gear ring 44.

[0034] The axle 22 is tubular, with one end of the input shaft 41 passing through it and connected to the main shaft 33 via a key. One end of the input shaft 41 is connected to the axle 22 via a fourth bearing 4, and the other end of the input shaft 41 is connected to the cover plate 13 of the drive frame 10 via a third bearing 3. This not only improves the rotational stability and load-bearing capacity of the input shaft 41 and enhances the structural compactness of the forklift electric drive wheel, but also ensures that the main shaft 33 of the drive motor 30 can be separated from the input shaft 41 by disassembling the side plate 12, thus ensuring the ease of replacing the rubber wheel 21 and wheel rim 23 assembly.

[0035] The input shaft 41 has two eccentric shaft portions 41a, which are symmetrically arranged with respect to the center line X of the input shaft 41. The planetary gears 43 have teeth on their outer periphery and multiple pin holes 43a in their center. The interiors of the two planetary gears 43 are rotatably connected to the two eccentric shaft portions 41a via a fifth bearing 5, corresponding one-to-one. The multiple pin holes 43a are evenly distributed circumferentially around the center line of the planetary gears 43, and the multiple pin holes 43a on the two planetary gears 43 are arranged correspondingly. The attached diagram shows four pin holes 43a; the number of pin holes 43a can be increased or decreased according to actual needs.

[0036] The internal gear ring 44 is fixedly connected to the vertical plate portion 11a of the drive frame 10. Both planetary teeth 43 mesh with the internal gear ring 44, and the two planetary teeth 43 are also centrally symmetrically arranged with respect to the center line X of the input shaft 41. The accompanying drawings show that the internal gear ring 44 has 60 teeth and the planetary teeth 43 have 58 teeth. The number of teeth in the internal gear ring 44 and the planetary teeth 43 can be adjusted adaptively according to actual conditions to adjust the transmission ratio.

[0037] The number of output pins 42 is the same as the number of pin holes 43a, and the output pins 42 and pin holes 43a are arranged in a one-to-one correspondence. A bushing 45 is fitted onto each output pin 42, and the bushing 45 on one output pin 42 simultaneously passes through the pin holes 43a of two planetary gears 43. The outer surface of the bushing 45 can contact the side surface of the pin hole 43a. One end of the axle 22 is a connecting disc 22a, and one end of multiple output pins 42 is fixedly connected to the connecting disc 22a by riveting. This structure not only reduces the manufacturing cost of the forklift electric drive wheel but also improves its service life and ease of maintenance.

Claims

1. An electric drive wheel for a forklift, comprising a drive frame (10), a rubber-coated wheel (20), and a drive motor (30); the rubber-coated wheel (20) comprises a rubber wheel (21) and an axle (22), the axle (22) being connected to the drive frame (10) via a first bearing (1); the drive motor (30) is located on one side of the rubber-coated wheel (20), the drive motor (30) comprising a stator (31), a rotor (32), and a main shaft (33), the stator (31) being fixedly connected to the drive frame (10), and the main shaft (33) being connected to the drive frame (10) via a second bearing (2); characterized in that, The forklift electric drive wheel also includes a two-tooth differential reduction gear assembly (40) having an input shaft (41), multiple output pins (42), two planetary gears (43), and an internal gear ring (44); the two-tooth differential reduction gear assembly (40) is located on the other side of the rubber-coated wheel (20), the input shaft (41) is connected to the drive frame (10) via a third bearing (3), one end of the input shaft (41) passes through the wheel axle (22), and one end of the input shaft (41) is connected to the main shaft (33) via a key; the input shaft ( 41) has two eccentric shafts (41a), two planetary teeth (43) are rotatably connected to the two eccentric shafts (41a) in a one-to-one correspondence, the internal gear ring (44) is fixedly connected to the drive frame (10), the two planetary teeth (43) mesh with the internal gear ring (44), the two planetary teeth (43) are provided with multiple pin holes (43a), multiple output pins (42) are correspondingly inserted into the multiple pin holes (43a) of the two planetary teeth (43), and the multiple output pins (42) are fixedly connected to the wheel axle (22).

2. The forklift electric drive wheel according to claim 1, characterized in that, The drive frame (10) includes a main frame (11) and a side plate (12). The main frame (11) includes a vertical plate (11a), a flat plate (11b), and a connecting pipe (11c). The flat plate (11b) of the main frame (11) and the side plate (12) are fixedly connected by bolts (14). A wheel mounting cavity (15) is formed between the side plate (12) and the vertical plate (11a) of the main frame (11). The rubber wheel (21) is located in the wheel mounting cavity (15).

3. The forklift electric drive wheel according to claim 2, characterized in that, The drive motor (30) also includes a housing (34), which is sealed and fixedly connected to the side plate (12). One end of the main shaft (33) is connected to the side plate (12) through a second bearing (2), and the other end of the main shaft (33) is connected to the housing (34) through a second bearing (2). The stator (31) is fixedly connected to the cylindrical part (34a).

4. The forklift electric drive wheel according to claim 2, characterized in that, The upright plate (11a) has a deceleration assembly mounting cavity (16), and the drive frame (10) also includes a cover plate (13) for sealing the opening of the deceleration assembly mounting cavity (16), and the cover plate (13) is fixedly connected to the upright plate (11a); the two-tooth differential deceleration transmission assembly (40) is located in the deceleration assembly mounting cavity (16).

5. The forklift electric drive wheel according to claim 1, 2, 3, or 4, characterized in that, The axle (22) is tubular, and one end of the input shaft (41) is connected to the axle (22) via a fourth bearing (4).

6. The forklift electric drive wheel according to claim 1, 2, 3, or 4, characterized in that, The two eccentric shafts (41a) are symmetrically arranged with respect to the center line X of the input shaft (41). The planetary gears (43) are rotatably connected to the eccentric shafts (41a) through the fifth bearing (5). The two planetary gears (43) are also symmetrically arranged with respect to the center line X of the input shaft (41).

7. The forklift electric drive wheel according to claim 1, 2, 3, or 4, characterized in that, The pin hole (43a) is located in the middle of the planetary tooth (43). Multiple pin holes (43a) are evenly distributed around the center line of the planetary tooth (43), and multiple pin holes (43a) on the two planetary teeth (43) are set one-to-one.

8. The electric drive wheel for a forklift according to claim 1, 2, 3, or 4, characterized in that, The output pin (42) is fitted with a bushing (45), and the output pin (42) contacts the side of the pin hole (43a) through the bushing (45).

9. The forklift electric drive wheel according to claim 1, 2, 3, or 4, characterized in that, One end of the axle (22) is a connecting disc (22a), and one end of the multiple output pins (42) is fixedly connected to the connecting disc (22a) by riveting.

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