Electric driving device for forklift

Abstract

The utility model relates to the technical field of vehicle driving devices, in particular to an electric driving device for a forklift, which comprises a first shell with a first mounting cavity and a second shell with a second mounting cavity, a planetary gear transmission component is arranged in the first mounting cavity and is sealed by a cover plate, a driving motor is arranged outside the cover plate, and the second mounting cavity is provided with a second mounting cavity. A motor rotating shaft of the driving motor can be connected with the planetary gear transmission assembly; a differential mechanism is arranged in the second mounting cavity; the first shell and the second shell are connected with each other to form a third mounting cavity, a driving gear assembly is arranged in the third mounting cavity and comprises an intermediate shaft capable of extending into the second mounting cavity, and the end of the intermediate shaft is sleeved with an intermediate shaft driving gear capable of being meshed with the differential mechanism. The device is simple and compact in structure, adopts the motor vertical half shaft arrangement, reduces the width direction space of the whole vehicle, and is more beneficial to the arrangement of other accessories of the whole vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle drive devices, in particular to an electric drive device for a forklift. Background Art

[0002] Forklifts, as industrial handling vehicles, are mainly used for loading and unloading, stacking and short-distance transportation of palletized goods. Among them, electric forklifts use motors as power and batteries as energy. Due to their low noise, they are widely used in indoor operations and other working conditions with high environmental requirements, such as the pharmaceutical and food industries.

[0003] In the prior art, the electric drive device used in forklifts mostly adopts parallel shaft reduction gear, and under the requirement of relatively large speed ratio, the parallel shaft type reducer needs to occupy a relatively high space. Therefore, the forklift needs to have enough installation space, which invisibly increases the width space of the whole vehicle, thereby affecting the installation of other functional components of the forklift.

[0004] Therefore, a new technical solution is urgently needed to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned problems of the prior art and provide an electric drive device for a forklift, which is used to solve the technical problem that the existing forklift uses parallel shaft deceleration to occupy the width space of the entire vehicle, thereby affecting the installation of other functional components of the forklift.

[0006] The above objectives are achieved through the following technical solutions:

[0007] An electric drive device for a forklift, comprising a first housing with a first mounting cavity, and a second housing with a second mounting cavity, wherein a planetary gear transmission assembly is arranged in the first mounting cavity and is sealed by a cover plate, a drive motor is arranged on the outer side of the cover plate, and a motor shaft of the drive motor can penetrate the cover plate and be connected to the planetary gear transmission assembly; a differential is arranged in the second mounting cavity; the first housing and the second housing are connected to each other to form a third mounting cavity, a drive gear assembly is arranged in the third mounting cavity, the drive gear assembly comprises an intermediate shaft which can extend into the second mounting cavity, and an intermediate shaft driving gear which can mesh with the differential is sleeved on the end of the intermediate shaft; an intermediate shaft driven gear is also sleeved on the intermediate shaft, and the intermediate shaft driven gear can mesh with the planetary gear transmission assembly extending into the third mounting cavity.

[0008] Furthermore, the planetary gear transmission assembly includes a planet carrier with a planet carrier output shaft, and a sun gear input shaft connected to the motor shaft; the sun gear input shaft is meshed with a planetary gear arranged at the side, and the outer side of each planetary gear is meshed with a gear ring arranged on the inner wall of the first mounting cavity; each planetary gear is movably connected to the planet carrier through a planetary pin shaft.

[0009] Furthermore, the planet carrier output shaft can pass through the planet carrier through hole provided on the first housing and extend into the second mounting cavity; a planet carrier gear is sleeved on the planet carrier output shaft, and the planet carrier gear can mesh with the intermediate shaft driven gear.

[0010] Furthermore, a third bearing is arranged between the planetary carrier output shaft and the planetary carrier through hole, and an elastic retaining ring for the shaft and an elastic retaining ring for the second hole are arranged on the side of the third bearing facing the third mounting cavity, the elastic retaining ring for the shaft is embedded in the outer wall of the planetary carrier output shaft, and the elastic retaining ring for the second hole is embedded in the inner wall of the planetary carrier through hole.

[0011] Furthermore, a fourth bearing embedding groove is provided on the inner wall of the third mounting cavity corresponding to the end of the planetary carrier output shaft, a fourth bearing is embedded in the fourth bearing embedding groove, and an inner ring of the fourth bearing is sleeved with the end of the planetary carrier output shaft.

[0012] Furthermore, a sun gear input shaft embedding groove is provided at the axis center position of the planet carrier, and a second bearing is embedded in the sun gear input shaft embedding groove, and an inner ring of the second bearing is sleeved with the sun gear input shaft.

[0013] Furthermore, a motor shaft through hole for the motor shaft to pass through is formed on the cover plate, and a first bearing embedding groove is provided on the inner wall of the motor shaft through hole, a first bearing is embedded in the first bearing embedding groove, and an inner ring of the first bearing is sleeved with the sun gear input shaft.

[0014] Furthermore, an oil seal is arranged on the outer side of the motor shaft through hole.

[0015] Furthermore, a fifth bearing embedding groove for embedding a fifth bearing is formed on the outer wall of the first shell, and a sixth bearing embedding groove for embedding a sixth bearing is formed on the outer wall of the second shell. The fifth bearing and the sixth bearing are movably sleeved on the intermediate shaft respectively.

[0016] Furthermore, the intermediate shaft driving gear is a bevel gear.

[0017] The utility model provides an electric drive device for forklifts, which reduces the power output by the drive motor by introducing a reducer that matches a planetary gear and a parallel shaft, and finally transmits the power from the differential to the drive half shaft. Under the same speed ratio requirement, the planetary gear relative parallel shaft structure can achieve a higher speed ratio of the same volume. By matching the planetary carrier with the parallel shaft, the adaptability of the design is increased. The device has a simple and compact structure, and adopts a vertical half shaft arrangement of the motor, which reduces the space in the width direction of the vehicle and is more conducive to the arrangement of other accessories of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic structural diagram of an electric drive device for a forklift.

[0019] Graphic marking:

[0020] 1-first housing, 101-first mounting cavity, 102-planet carrier through hole;

[0021] 2-second housing, 201-second installation cavity;

[0022] 3-cover plate, 301-motor shaft through hole;

[0023] 4-planetary gear transmission assembly, 401-planet carrier output shaft, 402-planet carrier, 403-sun gear input shaft, 404-planetary gear, 405-gear ring, 406-planetary pin shaft, 407-limit baffle, 408-planetary copper pad, 409-planetary steel pad, 410-needle bearing, 411-limit pin, 412-planet carrier gear, 413-third bearing, 414-shaft elastic retaining ring, 415-second hole elastic retaining ring, 416-fourth bearing, 417-sun gear input shaft embedded groove, 418-second bearing, 419-first hole elastic retaining ring, 420-first bearing;

[0024] 5-driving gear assembly, 501-intermediate shaft, 502-intermediate shaft driving gear, 503-intermediate shaft driven gear, 504-sixth bearing, 505-fifth bearing;

[0025] 6-driving motor, 601-motor shaft;

[0026] 7- Differential;

[0027] 8-third installation cavity;

[0028] 9-Oil seal. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below based on the accompanying drawings and embodiments. The described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1 As shown, the present solution provides an electric drive device for a forklift, comprising a first housing 1 with a first installation cavity 101, and a second housing 2 with a second installation cavity 201, wherein a planetary gear transmission assembly 4 is arranged in the first installation cavity 101 and is sealed by a cover plate 3, a drive motor 6 is arranged on the outer side of the cover plate 3, the drive motor 6 is fixed to the cover plate 3 by bolts, and a motor shaft 601 of the drive motor 6 can penetrate the cover plate 3 and be connected to the planetary gear transmission assembly 4;

[0031] A differential 7 is arranged in the second installation cavity 201; the first housing 1 and the second housing 2 are connected to each other to form a third installation cavity 8, and a driving gear assembly 5 is arranged in the third installation cavity 8, and the driving gear assembly 5 includes an intermediate shaft 501 that can extend into the second installation cavity 201, and an intermediate shaft driving gear 502 that can mesh with the differential 7 is sleeved on the end of the intermediate shaft 501; an intermediate shaft driven gear 503 is also sleeved on the intermediate shaft 501, and the intermediate shaft driven gear 503 can mesh with the planetary gear transmission assembly 4 that extends into the third installation cavity 8.

[0032] It should be noted that the intermediate shaft driving gear 502 is a bevel gear, which is meshed with the differential 7 to output the driving force vertically.

[0033] Working principle:

[0034] During operation, the power of the driving motor 6 is transmitted to the sun gear input shaft 403 through the motor shaft 601, and the sun gear input shaft 403 is transmitted to the planetary gear 404 through its own gears. The planetary gear 404 rotates to drive the planetary carrier 402 to rotate, and at the same time, it is respectively transmitted to the vehicle half-axles on both sides of the differential 7 through the planetary carrier gear 412 and the intermediate shaft driven gear 503, the intermediate shaft driving gear 502 and the differential 7.

[0035] like Figure 1As shown, in this embodiment, a fifth bearing embedding groove for embedding a fifth bearing 505 is opened on the outer wall of the first shell 1, and a sixth bearing embedding groove for embedding a sixth bearing 504 is opened on the outer wall of the second shell 2. The fifth bearing 505 and the sixth bearing 504 are movably connected to the intermediate shaft 501 respectively, so that the intermediate shaft 501 can rotate freely relative to the third mounting cavity 8.

[0036] In this embodiment, the planetary gear transmission assembly 4 includes a planet carrier 402 with a planet carrier output shaft 401, and a sun gear input shaft 403 connected to the motor shaft 601; the sun gear input shaft 403 is meshed with a planet gear 404 arranged at the side, and the outer side of each planet gear 404 is meshed with a gear ring 405 arranged on the inner wall of the first installation cavity 101;

[0037] Each of the planetary gears is movably connected to the planetary carrier 402 via a planetary pin 406 .

[0038] Specifically, the planetary pin 406 can pass through the central circular hole of the planetary wheel 404, and a limit baffle 407 is arranged on the outer side of the planetary wheel 404, and planetary copper pads 408 and planetary steel pads 409 are arranged between the limit baffle 407 and the planetary wheel 404 and between the planetary wheel 404 and the planetary carrier 402, wherein the planetary copper pads 408 fit the planetary wheel 404.

[0039] This embodiment mainly considers the wear resistance of the planetary frame, and designs the planetary copper pad 408 and the planetary steel pad 409 to cooperate with each other to reduce the amount of wear during the life cycle.

[0040] A needle bearing 410 is disposed between the central circular hole of the planetary wheel 404 and the planetary pin 406 , so that the planetary wheel 404 can rotate freely relative to the planetary pin 406 . The planetary pin 406 is connected to the planetary frame 402 by a stop pin 411 .

[0041] It should be noted that, in this embodiment, the intermediate shaft 501 and the planet carrier output shaft 401 are parallel to each other.

[0042] The planet carrier output shaft 401 can pass through the planet carrier through hole 102 opened on the first housing 1 and extend into the second mounting cavity 201 ; a planet carrier gear 412 is sleeved on the planet carrier output shaft 401 , and the planet carrier gear 412 can mesh with the intermediate shaft driven gear 503 .

[0043] A third bearing 413 is arranged between the planet carrier output shaft 401 and the planet carrier through hole 102. The third bearing 413 is embedded in the third bearing embedding groove opened in the planet carrier through hole 102 so that the planet carrier 402 can rotate freely relative to the planet carrier through hole 102, and a shaft elastic retaining ring 414 and a second hole elastic retaining ring 415 are arranged on the side of the third bearing 413 facing the third mounting cavity 8. The shaft elastic retaining ring 414 is embedded in the outer wall of the planet carrier output shaft 401, and the second hole elastic retaining ring 415 is embedded in the inner wall of the planet carrier through hole 102, thereby realizing the limiting support of the third bearing 413.

[0044] In this embodiment, a fourth bearing groove is opened on the inner wall of the third mounting cavity 8 corresponding to the end of the planetary carrier output shaft 401, and a fourth bearing 416 is embedded in the fourth bearing groove. The inner ring of the fourth bearing 416 is sleeved with the end of the planetary carrier output shaft 401, thereby realizing stable support for the planetary carrier 402 without affecting the free rotation of the planetary carrier 402.

[0045] In this embodiment, a sun gear input shaft embedding groove 417 is provided at the axial position of the planet carrier 402, and a second bearing 418 is embedded in the sun gear input shaft embedding groove 417, and the inner ring of the second bearing 418 is sleeved with the sun gear input shaft 403; on the other hand, a first hole elastic retaining ring 419 is provided on the outer side of the second bearing 418, and the first hole elastic retaining ring 419 is embedded in the inner wall of the sun gear input shaft embedding groove 417, thereby realizing the limiting fixation of the second bearing 418.

[0046] A motor shaft through hole 301 for the motor shaft 601 to pass through is also opened on the cover plate 3, and a first bearing embedding groove is provided on the inner wall of the motor shaft through hole 301, in which a first bearing 420 is embedded, and the inner ring of the first bearing 420 is sleeved with the sun gear input shaft 403.

[0047] In this embodiment, the first bearing 420 and the second bearing 418 clamp the two ends of the sun gear input shaft 403 respectively, which can achieve stable output of driving force while not affecting the free rotation of the sun gear input shaft 403, thereby further driving the planet carrier 402 to rotate.

[0048] As an optimization of this embodiment, an oil seal 9 is further provided on the outer side of the motor shaft through hole 301. The oil seal 9 is press-fitted on the motor shaft through hole 301, and the oil seal lip cooperates with the motor shaft 601 to seal the oil inside the reducer.

[0049] The above description is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric drive device for a forklift, characterized in that: The invention comprises a first housing (1) having a first installation cavity (101), and a second housing (2) having a second installation cavity (201); a planetary gear transmission assembly (4) is arranged in the first installation cavity (101) and is sealed by a cover plate (3); a drive motor (6) is arranged on the outer side of the cover plate (3); a motor shaft (601) of the drive motor (6) can pass through the cover plate (3) and be connected to the planetary gear transmission assembly (4); A differential (7) is arranged in the second mounting cavity (201); The first housing (1) and the second housing (2) are connected to each other to form a third installation cavity (8). A driving gear assembly (5) is arranged in the third installation cavity (8). The driving gear assembly (5) comprises an intermediate shaft (501) that can extend into the second installation cavity (201), and an intermediate shaft driving gear (502) that can mesh with the differential (7) is sleeved on the end of the intermediate shaft (501); an intermediate shaft driven gear (503) is also sleeved on the intermediate shaft (501), and the intermediate shaft driven gear (503) can mesh with the planetary gear transmission assembly (4) that extends into the third installation cavity (8).

2. The electric drive device for a forklift according to claim 1, characterized in that: The planetary gear transmission assembly (4) comprises a planet carrier (402) with a planet carrier output shaft (401), and a sun gear input shaft (403) connected to the motor shaft (601); the sun gear input shaft (403) meshes with a planet gear (404) arranged at a side position, and the outer side of each planet gear (404) meshes with a gear ring (405) arranged on the inner wall of the first installation cavity (101); Each of the planetary wheels is movably connected to the planetary frame (402) via a planetary pin shaft (406).

3. The electric drive device for a forklift according to claim 2, characterized in that: The planet carrier output shaft (401) can pass through a planet carrier through hole (102) provided on the first housing (1) and extend into the second mounting cavity (201); a planet carrier gear (412) is sleeved on the planet carrier output shaft (401), and the planet carrier gear (412) can mesh with the intermediate shaft driven gear (503).

4. The electric drive device for a forklift according to claim 3, characterized in that: A third bearing (413) is provided between the planet carrier output shaft (401) and the planet carrier through hole (102), and a shaft elastic retaining ring (414) and a second hole elastic retaining ring (415) are provided on a side of the third bearing (413) facing the third mounting cavity (8), the shaft elastic retaining ring (414) being embedded in the outer wall of the planet carrier output shaft (401), and the second hole elastic retaining ring (415) being embedded in the inner wall of the planet carrier through hole (102).

5. The electric drive device for a forklift according to claim 4, characterized in that: A fourth bearing embedding groove is provided on the inner wall of the third mounting cavity (8) corresponding to the end of the planetary carrier output shaft (401), a fourth bearing (416) is embedded in the fourth bearing embedding groove, and an inner ring of the fourth bearing (416) is sleeved with the end of the planetary carrier output shaft (401).

6. The electric drive device for a forklift according to claim 2, characterized in that: A sun gear input shaft embedding groove (417) is provided at the axis center position of the planet carrier (402), and a second bearing (418) is embedded in the sun gear input shaft embedding groove (417), and the inner ring of the second bearing (418) is sleeved with the sun gear input shaft (403).

7. The electric drive device for a forklift according to claim 6, characterized in that: The cover plate (3) is provided with a motor shaft through hole (301) through which the motor shaft (601) can pass, and a first bearing embedding groove is provided on the inner wall of the motor shaft through hole (301), a first bearing (420) is embedded in the first bearing embedding groove, and the inner ring of the first bearing (420) is sleeved with the sun gear input shaft (403).

8. The electric drive device for a forklift according to claim 7, characterized in that: An oil seal (9) is also provided on the outside of the motor shaft through hole (301).

9. The electric drive device for a forklift according to claim 2, characterized in that: A fifth bearing embedding groove for embedding a fifth bearing (505) is provided on the outer wall of the first housing (1), and a sixth bearing embedding groove for embedding a sixth bearing (504) is provided on the outer wall of the second housing (2). The fifth bearing (505) and the sixth bearing (504) are movably sleeved on the intermediate shaft (501) respectively.

10. The electric drive device for a forklift according to claim 1, characterized in that: The intermediate shaft driving gear (502) is a bevel gear.

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