Gear box for electric forklift

Abstract

The utility model relates to the technical field of transmission machinery, in particular to a gear box for an electric forklift, which comprises a box body, a motor, an input shaft component, a transmission shaft component, a differential component and a planetary reduction component are mounted on the box body, and an output shaft of the motor and the input shaft component are coaxially arranged. The input shaft component, the transmission shaft component and the differential component are sequentially arranged side by side. The planetary reduction component is located between the motor and the input shaft component. Power output by the motor reaches the differential mechanism component through the planetary speed reduction component, the input shaft component and the transmission shaft component. The gearbox has the advantages that the overall structure of the gearbox is more compact by utilizing the characteristics of the planetary reduction component, meanwhile, the gearbox can bear a high reduction ratio, transmission is stable and reliable, and transmission efficiency is high; the motor is integrated on the gear box, so that the size and the length of the gear box are reduced, the space utilization rate is more effective, and installation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of transmission machinery technology, and in particular to a gearbox for electric forklifts. Background Technology

[0002] Currently, most forklifts on the market are powered by internal combustion engines. However, internal combustion engines produce significant exhaust fumes and noise. Therefore, forklifts powered by electric motors are more energy-efficient and do not pollute the environment.

[0003] The gearboxes used in electric forklifts today have a similar structure to those in internal combustion engines. Power is input from the prime mover, transmitted through a series of gears, and finally sent to the differential. However, current gearboxes are all linearly integrated structures, meaning that from the motor, the entire transmission gear set and the differential are arranged in a straight line. This makes the gearbox too bulky and difficult to install on a forklift.

[0004] Therefore, this case is brought. Utility Model Content

[0005] The purpose of this invention is to provide a gearbox for electric forklifts that is simple in structure, small in size, saves installation space, produces little pollution, and has a high reduction ratio.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A gearbox for an electric forklift includes a gearbox body on which a motor, an input shaft assembly, a drive shaft assembly, and a differential assembly are mounted. A planetary reduction gear is mounted on the gearbox body. The output shaft of the motor is coaxial with the input shaft assembly. The input shaft assembly, drive shaft assembly, and differential assembly are arranged in parallel. The planetary reduction gear is located between the motor and the input shaft assembly. The output shaft of the motor is connected to the input end of the planetary reduction gear, the output end of the planetary reduction gear is connected to the input end of the input shaft assembly, the output end of the input shaft assembly is connected to the input end of the drive shaft assembly, and the output end of the drive shaft assembly is connected to the input end of the differential assembly.

[0008] Furthermore, the gearbox body includes a shaft component side gearbox, a shaft component side gearbox cover, a differential base, and a differential gearbox cover. The shaft component side gearbox and the differential base are fixed together by bolts. The shaft component side gearbox and the shaft component side gearbox cover are fixed together by bolts and locating pins. The differential base and the differential gearbox cover are fixed together by bolts and locating pins.

[0009] Furthermore, the motor is fixed on the side cover of the shaft component, and the motor output shaft enters the side housing of the shaft component; the planetary reduction component includes a gear ring, planetary gears, and a planetary shaft. The gear ring is fixed on the side cover of the shaft component and arranged around the motor output shaft. The planetary shaft is located between the gear ring and the motor output shaft. The planetary gears are mounted on the planetary shaft through bearings and mesh with the gear ring. The motor output shaft has an integral gear and shaft structure and meshes with the planetary gears; the input shaft component includes an input shaft. Both ends of the input shaft are mounted on the side housing of the shaft component and the side cover of the shaft component through bearings, respectively, and the end of the input shaft near the motor is fixed to the planetary shaft.

[0010] Furthermore, the input shaft component includes an input gear, and the transmission shaft component includes a transmission shaft and a transmission gear. The input gear is fixed on the input shaft and meshes with the transmission gear. The transmission gear is fixed on the transmission shaft. The transmission shaft is an integral gear and shaft structure, and its two ends are respectively mounted on the side housing of the shaft component and the side cover of the shaft component through bearings.

[0011] Furthermore, the differential component includes a driven gear and a differential assembly. The differential assembly is mounted between the differential base and the differential housing cover via bearings. The driven gear is mounted in the housing on the side of the shaft component and is located between the differential assembly and the drive shaft. The two sides of the driven gear mesh with the teeth on the differential assembly and the drive shaft, respectively.

[0012] Furthermore, a wear-bearing pad and a baffle are installed on the planetary shaft. The baffle is located at the end of the planetary shaft away from the input shaft, and the planetary gear is located between the baffle and the input shaft. There are two wear-bearing pads. One wear-bearing pad is located between the planetary gear and the end wall of the planetary shaft near the input shaft, and the other wear-bearing pad is located between the baffle and the planetary gear. The baffle is fastened to the planetary shaft with screws and presses against the adjacent wear-bearing pad. The degree of pressure of the baffle on the wear-bearing pad can be adjusted by tightening the screws.

[0013] Furthermore, a skeleton oil seal is provided on the outer side of the bearing between the input shaft and the shaft component side cover, and the lip of the skeleton oil seal faces the inner side of the housing body.

[0014] The advantages of this utility model are: the gearbox utilizes the characteristics of planetary reduction components, making the overall structure of the gearbox more compact, while being able to withstand high reduction ratios, ensuring smooth and reliable transmission with high transmission efficiency; integrating the motor into the gearbox reduces the size and length of the gearbox, making space utilization more efficient, facilitating installation, reducing noise, and lowering transportation and storage costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the gearbox structure in the embodiment;

[0016] Figure 2 for Figure 1 Enlarged schematic diagram of the central planetary gear;

[0017] Figure 3 This is a schematic diagram of the gearbox transmission in the embodiment;

[0018] Label Explanation

[0019] 1. Motor; 101. Motor output shaft; 201. Shaft assembly side cover; 202. Shaft assembly side housing; 203. Differential base; 204. Differential housing cover; 3. Gear ring; 4. Skeleton oil seal; 5. Planetary shaft; 6. Planetary gear; 7. Input shaft; 8. Input gear; 9. Drive shaft; 10. Drive gear; 11. Driven gear; 12. Differential assembly; 13. Wear-resistant pad; 14. Baffle; 15. Screw; 16. Bearing. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" etc. indicated by the accompanying drawings are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 the present invention.

[0021] This embodiment proposes a gearbox for electric forklifts, such as... Figure 1 and Figure 2 As shown, it mainly includes the gearbox body, motor 1, planetary reduction gear, input shaft assembly, transmission shaft assembly and differential assembly.

[0022] The gearbox body includes a shaft component side housing 202, a shaft component side housing cover 201, a differential base 203, and a differential housing cover 204. The shaft component side housing 202 and the differential base 203 are arranged horizontally and fixed together with bolts. The shaft component side housing 202 and the shaft component side housing cover 201 are connected and fixed by bolts and locating pins, and the differential base 203 and the differential housing cover 204 are connected and fixed by bolts and locating pins. The planetary reduction component, input shaft component, drive shaft component, and differential component are all installed inside the gearbox body, and the motor 1 is installed on the shaft component side housing cover 201. The output shaft 101 of the motor 1 is coaxially arranged with the input shaft component. The input shaft component, drive shaft component, and differential component are arranged in parallel in sequence and are horizontally arranged as a whole. The planetary reduction component is located between the motor 1 and the input shaft component.

[0023] The motor 1 is bolted to the shaft component side housing 201, and the motor output shaft 101 enters the shaft component side housing 202. The planetary reduction component includes a gear ring 3, planetary gears 6, and a planetary shaft 5. The gear ring 3 is fixed to the shaft component side housing 201 by an interference fit and is arranged around the motor output shaft 101. The planetary shaft 5 is located between the gear ring 3 and the motor output shaft 101. The planetary gears 6 are mounted on the planetary shaft 5 by needle roller bearings and mesh with the gear ring 3. The output shaft 101 of the motor 1 has an integral gear and shaft structure and meshes with the planetary gears 6. The input shaft component includes an input shaft 7. Both ends of the input shaft 7 are mounted on the shaft component side housing 202 and the shaft component side housing 201 by deep groove ball bearings, respectively. The end of the input shaft 7 near the motor 1 is integrally formed with the planetary shaft 5 to form a fixed structure. When the planetary shaft 5 revolves around the motor output shaft 101, it can drive the input shaft 7 to rotate.

[0024] Preferably, a wear-bearing pad 13 and a baffle 14 are installed on the planetary shaft 5. The baffle 14 is located at the end of the planetary shaft 5 away from the input shaft 7, and the planetary gear 6 is located between the baffle 14 and the input shaft 7. There are two wear-bearing pads 13. One wear-bearing pad 13 is located between the planetary gear 6 and the end wall of the planetary shaft 5 near the input shaft 7, and the other wear-bearing pad 13 is located between the baffle 14 and the planetary gear 6. The baffle 14 is fastened to the planetary shaft 5 by an internal hexagon screw 15 and presses against the adjacent wear-bearing pad 13. The tightness of the baffle 14 on the wear-bearing pad 13 can be adjusted by tightening the screw 15 to adjust the installation clearance.

[0025] The input shaft component also includes an input gear 8, and the transmission shaft component includes a transmission shaft 9 and a transmission gear 10. The input gear 8 is fixed on the input shaft 7 and meshes with the transmission gear 10. The transmission gear 10 is fixed on the transmission shaft 9. The transmission shaft 9 is an integral gear shaft structure, and its two ends are respectively mounted on the shaft component side housing 202 and the shaft component side housing cover 201 through cylindrical roller bearings.

[0026] The differential assembly includes a driven gear 11 and a differential assembly 12. The differential assembly 12 is mounted between the differential base 203 and the differential housing cover 204 via a deep groove ball bearing. The driven gear 11 is mounted in the shaft assembly side housing 202 and is located between the differential assembly 12 and the drive shaft 9. The two sides of the driven gear 11 mesh with the teeth on the differential assembly 12 and the drive shaft 9, respectively.

[0027] like Figure 3As shown, when the gear reducer is working, the power of the motor 1 is first transmitted to the planetary gear 6. Due to the action of the gear ring 3, the planetary shaft 5 where the planetary gear 6 is located revolves around the motor output shaft 101 as the sun center. At the same time, the planetary gear 6 starts to rotate around the center of the planetary shaft 5, so that the input shaft 7 can rotate. The subsequent power transmission sequence is input shaft 7 → input gear 8 → transmission gear 10 → transmission shaft 9 → driven gear 11 → differential assembly 12.

[0028] Preferably, a skeleton oil seal 4 is provided on the outer side of the bearing between the input shaft 7 and the shaft component side cover 201, and the lip of the skeleton oil seal 4 faces the inner side of the housing body. In this way, the lubricating oil at the input shaft component can be locked in the housing body to prevent leakage.

[0029] The above embodiments are only used to explain the concept of this utility model, and are not intended to limit the protection of this utility model. Any non-substantial modifications made to this utility model using this concept should fall within the protection scope of this utility model.

Claims

1. A gear box for electric fork truck, comprising a box body, a motor, an input shaft component, a transmission shaft component and a differential component mounted on the box body; characterized in that: a planetary reduction component is mounted on the box body, the output shaft of the motor is coaxially arranged with the input shaft component, the input shaft component, the transmission shaft component and the differential component are arranged in sequence and side by side, and the planetary reduction component is located between the motor and the input shaft component; the output shaft of the motor is connected with the input end of the planetary reduction component, the output end of the planetary reduction component is connected with the input end of the input shaft component, the output end of the input shaft component is connected with the input end of the transmission shaft component, and the output end of the transmission shaft component is connected with the input end of the differential component. the box body comprises a shaft component side box body, a shaft component side box cover, a differential base and a differential box cover, the shaft component side box body and the differential base are fixed by bolt connection, the shaft component side box body and the shaft component side box cover are fixed by bolt and positioning pin connection, and the differential base and the differential box cover are fixed by bolt and positioning pin connection.

2. A gear box for an electric fork truck as defined in claim 1, characterized in that the motor is fixed on the shaft component side box cover, and the output shaft of the motor enters the shaft component side box body; 3. A gear box for an electric fork truck as defined in claim 2, wherein, the planetary reduction component comprises a ring gear, a planetary gear and a planetary shaft, the ring gear is fixed on the shaft component side box cover and arranged around the output shaft of the motor, the planetary shaft is located between the ring gear and the output shaft of the motor, the planetary gear is mounted on the planetary shaft through a bearing and engaged with the ring gear, and the output shaft of the motor is a tooth shaft integrated structure and engaged with the planetary gear; the input shaft component comprises an input shaft, both ends of the input shaft are mounted on the shaft component side box body and the shaft component side box cover through bearings respectively, and the end of the input shaft close to the motor is fixed with the planetary shaft. the input shaft component comprises an input gear, the transmission shaft component comprises a transmission shaft and a transmission gear, the input gear is fixed on the input shaft and engaged with the transmission gear, the transmission gear is fixed on the transmission shaft, and the transmission shaft is a tooth shaft integrated structure and both ends thereof are mounted on the shaft component side box body and the shaft component side box cover through bearings respectively.

4. A gear box for an electric fork truck as defined in claim 3, wherein, the differential component comprises a driven gear and a differential assembly, the differential assembly is mounted between the differential base and the differential box cover through a bearing, the driven gear is mounted in the shaft component side box body and located between the differential assembly and the transmission shaft, and the driven gear is engaged with the teeth on the differential assembly and the transmission shaft on both sides thereof.

5. A gear box for an electric fork truck as defined in claim 4, wherein, a wear pad and a baffle are mounted on the planetary shaft, the baffle is located at the end of the planetary shaft away from the input shaft, and the planetary gear is located between the baffle and the input shaft; the wear pad has two, one of which is located between the planetary gear and the end wall of the planetary shaft close to the input shaft, and the other is located between the baffle and the planetary gear, the baffle is fastened on the planetary shaft through a screw and presses the wear pad adjacent thereto; 6. A gear box for an electric fork truck as defined in claim 3 wherein, the tightness of the baffle on the wear pad can be adjusted through a tension screw. the outer side of the bearing between the input shaft and the shaft component side box cover is provided with a skeleton oil seal, and the lip of the skeleton oil seal faces the inner side of the box body.

7. A gear box for an electric fork truck as defined in claim 2 wherein, ​

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