Two-stage transmission electric forklift reduction gearbox

Abstract

The utility model belongs to the technical field of reduction gearboxes, and particularly relates to a two-stage transmission electric forklift reduction gearbox which comprises a shell and a differential mechanism, an input shaft is arranged in the shell, and a gear shaft is arranged in the shell. The left box body is integrated, namely, the left box body and the box cover are integrally formed, so that the rigidity is better, the transverse space can be effectively saved, the structure of the reduction box is more compact, the left box body and the right box body can be separated, a bearing on the gear shaft is convenient to install, and the two ends of the gear shaft are rotationally arranged in the left box body and the right box body; in other words, the two ends of the gear shaft do not penetrate through the left box body and the right box body, holes for installing the gear shaft do not need to be formed in the left box body and the right box body, the risk of oil leakage is reduced, the situation that a cover plate and an O-shaped ring are needed for sealing after a through hole is additionally formed is avoided, the number of parts is reduced, and cost is reduced; the device is compact in transverse structure, the bearing is convenient to install, oil leakage risks can be reduced, the number of parts is reduced, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically a two-stage transmission gearbox for electric forklifts. Background Technology

[0002] Utility model patent CN214331366U discloses an electric forklift gearbox, including a housing. The housing contains a primary gear pair driven by a motor, a secondary gear pair connected to the primary gear pair, and a differential device connected to the wheels. The differential device is connected to the secondary gear pair and drives the wheels as the secondary gear pair rotates. This electric forklift gearbox has a more compact structure, effectively reducing the axial dimension and housing volume of the gearbox, lowering the space occupancy rate, meeting the compact installation space requirements of electric forklifts, effectively improving the positioning accuracy of the primary driven helical gear, ensuring high matching accuracy between the primary and secondary gear pairs, guaranteeing stable movement of the primary gear pair, effectively reducing operating noise, improving power transmission efficiency and the stability of the internal structure of the gearbox, and extending its service life.

[0003] Currently, most electric forklift gearboxes used in two-stage transmissions primarily consist of a housing with two bearing mounting points on one side, connected to a cover by bolts. The cover requires a certain thickness to ensure strength and sealing, increasing the lateral space of the gearbox. Due to limitations in the housing and gear shaft structure, installing bearings on the gear shaft requires operation through through-holes in the housing, which is inconvenient. Furthermore, the through-holes at the mating points of the housing, cover, and gear shaft increase the risk of oil leakage. The through-holes in the cover require cover plates and O-rings for sealing, increasing the number of parts and raising costs. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this utility model is to provide a two-stage transmission electric forklift gearbox, which solves the problems of inconvenience in installing bearings on the gear shaft due to the limitations of the gearbox and gear shaft structure, which requires operation through the gearbox through the gearbox through the through hole, and the through hole at the fit between the gearbox, gearbox cover and gear shaft increases the risk of oil leakage. The through hole on the gearbox cover requires a cover plate and O-ring to achieve the sealing function, which increases the number of parts and increases the cost.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a two-stage transmission electric forklift gearbox, comprising a housing and a differential, wherein an input shaft is disposed inside the housing, a gear shaft is disposed inside the housing, a drive gear is fixedly connected to the outer side of the input shaft, a first transmission gear is fixedly connected to the outer side of the gear shaft, and a second transmission gear is fixedly connected to the outer side of the gear shaft and above the first transmission gear, wherein the drive gear meshes with the first transmission gear, and the second transmission gear meshes with the differential.

[0006] Preferably, a second bearing and a third bearing are fixedly connected to the outer side of the input shaft, and both the second and third bearings are fixedly installed to the housing. The output shaft is installed by providing the second and third bearings.

[0007] Preferably, a first bearing is fixedly mounted on the outer side of the gear shaft, and the first bearing and the housing are fixedly mounted. The gear shaft is supported by the first bearing.

[0008] Preferably, the housing includes a left housing and a right housing. The right housing has an opening on one side and an input port on the other side. The left housing is located at the opening of the right housing. Both the left and right housings have output ports at one end. The differential is located at the output port. One end of the input shaft and the gear shaft are both located on the right housing, and the other end of the input shaft and the gear shaft are both located on the left housing. The input shaft is aligned with the input port. The left housing is bolted to the right housing.

[0009] Preferably, the differential includes a housing, within which a differential shaft is disposed. Two planetary gears are disposed at each end of the differential shaft. The two ends of the housing are rotatably mounted on the housing. A gear ring is disposed on the outer wall of the housing, meshing with a second transmission gear. An output shaft is perpendicularly inserted through the middle of the differential shaft, and a half-shaft gear is disposed on the outer side of the output shaft, meshing with the planetary gears. By providing the differential, the speed difference of the device is adjusted.

[0010] Preferably, a fourth bearing and a fifth bearing are fixedly installed on the outer side of the housing, and both the fourth and fifth bearings are fixedly installed to the housing. An adjusting nut is provided on the housing. The housing is installed and fixed by providing the fourth and fifth bearings.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The left housing of this utility model is an integral piece, that is, the left housing and the housing cover are integrally formed, which has better rigidity, can effectively save lateral space, and make the structure of the gearbox more compact. The left housing and the right housing can be separated, and the bearing on the gear shaft is easy to install. Both ends of the gear shaft are rotatably located inside the left housing and the right housing, that is, neither end of the gear shaft passes through the left housing and the right housing. The left housing and the right housing do not need to open holes for installing the gear shaft, which reduces the risk of oil leakage and avoids the need for cover plates and O-rings for sealing after adding through holes. It reduces the number of parts and lowers the cost. The device has a compact lateral structure, convenient bearing installation, and can reduce the risk of oil leakage, reduce the number of parts, and lower the cost. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This utility model Figure 1 Top sectional view.

[0014] In the diagram: 1. Housing; 11. Left housing; 12. Right housing; 121. Bolt; 2. Differential; 21. Housing; 211. Fourth bearing; 212. Fifth bearing; 22. Differential shaft; 23. Planetary gear; 24. Half-shaft gear; 25. Gear ring; 26. Output shaft; 3. Input shaft; 31. Drive gear; 32. Second bearing; 33. Third bearing; 4. Gear shaft; 41. First transmission gear; 42. Second transmission gear; 43. First bearing; 5. Opening; 6. Input port; 7. Output port; 8. Adjusting nut. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-2 A two-stage transmission electric forklift gearbox includes a housing 1 and a differential 2. An input shaft 3 is disposed inside the housing 1. A second bearing 32 and a third bearing 33 are fixedly connected to the outside of the input shaft 3. The second bearing 32 and the third bearing 33 are both fixedly installed to the housing 1. The output shaft 3 is installed by the second bearing 32 and the third bearing 33. A gear shaft 4 is disposed inside the housing 1. A first bearing 43 is fixedly installed to the outside of the gear shaft 4. The first bearing 43 is fixedly installed to the housing 1. The first bearing 43 supports the gear shaft 4. A drive gear 31 is fixedly connected to the outside of the input shaft 3. A first transmission gear 41 is fixedly connected to the outside of the gear shaft 4. A second transmission gear 42 is fixedly connected to the outside of the gear shaft 4 and above the first transmission gear 41. The drive gear 31 meshes with the first transmission gear 41, and the second transmission gear 42 meshes with the differential 2.

[0017] Please see Figures 1-2 The housing 1 includes a left housing 11 and a right housing 12. An opening 5 is provided on one side of the right housing 12, and an input port 6 is provided on the other side of the right housing 12. The left housing 11 is located at the opening 5 of the right housing 12. An output port 7 is provided at one end of both the left housing 11 and the right housing 12. The differential 2 is located at the output port 7. One end of the input shaft 3 and the gear shaft 4 are both located on the right housing 12, and the other end of the input shaft 3 and the gear shaft 4 are both located on the left housing 11. The input shaft 3 is aligned with the input port 6. The left housing 11 is mounted on the right housing 12 by bolts 121.

[0018] Please see Figures 1-2 The differential 2 includes a housing 21, which is housed inside the housing 1. A fourth bearing 211 and a fifth bearing 212 are fixedly mounted on the outer side of the housing 21. Both the fourth bearing 211 and the fifth bearing 212 are fixedly mounted to the housing 1. An adjusting nut 8 is provided on the housing 21. The housing 21 is fixed by the fourth bearing 211 and the fifth bearing 212. A differential shaft 22 is provided inside the housing 21. Two planetary gears 23 are provided at both ends of the differential shaft 22. The two ends of the housing 21 are rotatably mounted on the housing 1. A gear ring 25 is provided on the outer wall of the housing 21. The gear ring 25 meshes with the second transmission gear 42. An output shaft 26 is vertically inserted through the middle of the differential shaft 22. A half-shaft gear 24 is provided on the outer side of the output shaft 26. The half-shaft gear 24 meshes with the planetary gears 23. The differential 2 is used to adjust the speed difference of the device.

[0019] The specific implementation process of this utility model is as follows: In use, the driving gear 31 and the first transmission gear 41 mesh to form a first-stage cylindrical helical gear transmission. The input shaft 3 is the driving component and is connected to the vehicle drive motor of the electric counterbalance forklift. The second transmission gear 42 meshes with the gear ring 25 to form a second-stage cylindrical helical gear transmission. The second transmission gear 42 is the driving component, and the gear ring 25 is the driven component. The gear ring 25 is fixed to the housing 21 by a reamed hole bolt. The gear ring 25 transmits torque to the housing 21 of the differential 2. The housing 21 transmits torque to the planetary gear 23 through the internal differential shaft 22. The planetary gear 23 meshes with the half-shaft gear 24 and is connected to the output shaft 26 through the internal spline at the half-shaft gear 24. When the vehicle drive motor is connected to this gearbox, its output shaft 26 is upright. From the perspective of the connection with the power source, the gearbox is horizontal. When the vehicle drive motor is working, it is connected to the input shaft 3 through a spline. Power and motion are transmitted to the gear ring 25 through the input shaft 3, the drive gear 31, the first transmission gear 41, the gear shaft 4, and the second transmission gear 42. The gear ring 25 transmits to the housing 21 through the reamed hole bolt. The housing 21 transmits to the planetary gear 23 through the internal cross shaft. The planetary gear 23 meshes with the half-shaft gear 24 and is connected to the output shaft 26 through the internal spline at the half-shaft gear 24. The output shaft 26 drives the tire to rotate forward or backward, thereby realizing the forward or backward movement of the vehicle.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A two-stage transmission electric forklift gearbox, comprising a housing (1) and a differential (2), characterized in that: An input shaft (3) is provided inside the housing (1), and a gear shaft (4) is provided inside the housing (1). A drive gear (31) is fixedly connected to the outside of the input shaft (3), and a first transmission gear (41) is fixedly connected to the outside of the gear shaft (4). A second transmission gear (42) is fixedly connected to the outside of the gear shaft (4) and above the first transmission gear (41). The drive gear (31) meshes with the first transmission gear (41), and the second transmission gear (42) meshes with the differential (2). The housing (1) includes a left housing (11) and a right housing (12). The right housing (12) has an opening (5) on one side and an input port (6) on the other side. The left housing (11) is located at the opening (5) of the right housing (12). Both the left housing (11) and the right housing (12) have an output port (7) at one end. The differential (2) is located at the output port (7). One end of the input shaft (3) and the gear shaft (4) are both located on the right housing (12), and the other end of the input shaft (3) and the gear shaft (4) are both located on the left housing (11). The input shaft (3) is aligned with the input port (6). The left housing (11) is mounted on the right housing (12) by bolts (121).

2. The two-stage transmission electric forklift gearbox according to claim 1, characterized in that: The input shaft (3) is fixedly connected to a second bearing (32) and a third bearing (33), both of which are fixedly installed on the housing (1).

3. The two-stage transmission electric forklift gearbox according to claim 1, characterized in that: A first bearing (43) is fixedly installed on the outer side of the gear shaft (4), and the first bearing (43) and the housing (1) are fixedly installed.

4. The two-stage transmission electric forklift gearbox according to claim 1, characterized in that: The differential (2) includes a housing (21), which is disposed inside the housing (1). A differential shaft (22) is disposed inside the housing (21). Two planetary gears (23) are disposed at both ends of the differential shaft (22). The two ends of the housing (21) are rotatably disposed on the housing (1). A gear ring (25) is disposed on the outer wall of the housing (21). The gear ring (25) meshes with the second transmission gear (42). An output shaft (26) is vertically disposed through the middle of the differential shaft (22). A half-shaft gear (24) is disposed on the outer side of the output shaft (26). The half-shaft gear (24) meshes with the planetary gears (23).

5. A two-stage transmission electric forklift gearbox according to claim 4, characterized in that: A fourth bearing (211) and a fifth bearing (212) are fixedly installed on the outer side of the outer shell (21). The fourth bearing (211) and the fifth bearing (212) are both fixedly installed on the outer shell (1). An adjusting nut (8) is provided on the outer shell (21).

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