CN216808017U - Vertical structure reduction gearbox for electric forklift - Google Patents

Abstract

The utility model discloses a vertical structure reduction gearbox for an electric forklift, which comprises a box body, a primary gear set and a secondary gear set, wherein the primary gear set and the secondary gear set are arranged on the box body and are in meshing transmission, the secondary gear set comprises an output shaft and a spiral bevel gear, one end of the output shaft extends into the box body, the output shaft is in running fit with the box body, and the spiral bevel gear is fixed on the output shaft through a connecting piece, a sleeve and a locking nut. Like this, be different from the integrative structure of spiral bevel gear and output shaft among the prior art, in this scheme, spiral bevel gear and the design of output shaft components of a whole that can function independently, the preparation of output shaft and spiral bevel gear of so being convenient for to through adjusting spiral bevel gear position on the output shaft and fixing, the meshing between one-level gear train of completion and the spiral bevel gear of standard that can relax, make the installation of reducing gear box swift and accurate more.

Description

Vertical structure reduction gearbox for electric forklift

Technical Field

The utility model relates to the field of logistics forklifts, in particular to a reduction gearbox with a vertical structure for an electric forklift.

Background

The reduction gearbox is used as one of main transmission systems of the electric forklift, and is used for improving the compactness of structural arrangement, reasonably arranging shafting positions and reducing the size of a part speed box, so that the forklift is easier to arrange in space size during design. The reduction gearbox adopts an I-shaped (vertical) structural arrangement design, reduces the overall structure, ensures that the turning radius of the forklift is small, and is widely applied to the forward forklift.

Chinese utility model patent publication No. CN201875060U provides a three-pivot reducing gear box, including reducing gear box, gear shaft, bearing and fixed connection and sealing attachment, its characterized in that: a first-stage cylindrical gear pair and a second-stage spiral bevel gear pair are arranged in the reduction box body; the primary cylindrical gear pair consists of an output shaft, a flat key, a driven gear, a self-locking nut and a driving gear, the driving gear is directly arranged on the output shaft of the motor and is meshed with the driven gear in the box body of the reduction gearbox after being connected with the reduction gearbox, and the driven gear is fixed on the output shaft through the flat key and the self-locking nut; the second spiral bevel gear pair consists of a spiral bevel gear, an output shaft, a tapered roller bearing, an exposed skeleton type oil seal, a circlip for a hole, a circlip for a shaft and a deep groove ball bearing, power output by the motor is transmitted to the output shaft through the first cylindrical gear pair, and the output shaft is meshed with the spiral bevel gear and then output by the spiral bevel gear. The spiral bevel gear is fixed in the box body of the reduction gearbox through a pair of deep groove ball bearings which are arranged back to back.

In the prior art, when the output is carried out in the reduction gearbox, the output shaft of the reduction gearbox and the spiral bevel gear are generally designed integrally or the spiral bevel gear is fixed on the output shaft of the reduction gearbox in a hot-pressing mode for output, but in the corresponding technical specification, the requirement on the meshing precision between two meshed bevel gears is high, so that the requirement on the position is high when parts are cast and installed, the assembly difficulty is high, and the maintenance and the scrapping are frequent.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of great casting and installation difficulty caused by the adoption of an integrated output shaft and a spiral bevel gear in the prior art, the utility model aims to provide a vertical structure reduction gearbox for an electric forklift; through with spiral bevel gear demountable installation on the output shaft's mode, reduce the installation degree of difficulty of spiral bevel gear and output shaft.

In order to achieve the purpose, the utility model adopts the following technical scheme: a reduction gearbox with a vertical structure for an electric forklift comprises a box body, a primary gear set and a secondary gear set, wherein the primary gear set and the secondary gear set are arranged on the box body and are in meshing transmission with the secondary gear set, the secondary gear set comprises an output shaft, a spiral bevel gear, a locking nut and a sleeve, one end of the output shaft extends into the box body, the output shaft is rotatably arranged on the box body, the spiral bevel gear, the locking nut and the sleeve are all sleeved on the output shaft, the locking nut is in threaded connection with the output shaft, the spiral bevel gear is positioned between the sleeve and the locking nut, the left end and the right end of the spiral bevel gear respectively abut against the sleeve and the locking nut, the spiral bevel gear can be axially fixed through the sleeve and the locking nut, a connecting key is arranged between the spiral bevel gear and the output shaft, the spiral bevel gear can be radially fixed through the connecting key, and the spiral bevel gear is meshed with the primary gear set. Like this, can with spiral bevel gear demountable installation on the output shaft, can change the position of spiral bevel gear on the output shaft through the length that changes the sleeve, and then can guarantee the meshing precision between spiral bevel gear and the output shaft, reduce the manufacturing degree of difficulty of spiral bevel gear and output shaft, reduce the assembly degree of difficulty of reducing gear box.

Preferably, one end of the output shaft is an output end, the output end is positioned on the left side of the box body, the other end of the output shaft extends rightwards to enter the box body, the output shaft is installed on the box body through a bearing, and an oil seal for preventing oil in the box body from leaking is further arranged between the output shaft and the box body; the two ends of the sleeve are respectively abutted against the inner ring of the bearing and the spiral bevel gear. Therefore, the structure of the reduction gearbox is more compact, and the stability of the spiral bevel gear during transmission is ensured.

Preferably, the bearing is a tapered roller bearing.

Preferably, the right side of the body is provided with an opening communicated with the inside of the body, an end cover is fixedly arranged at the opening, the opening is blocked by the end cover, and the right end of the output shaft is supported on the end cover through a bearing. In this way, the installation of the secondary gear set is facilitated.

Preferably, the output shaft is a stepped shaft, the locknut is mounted on the smaller diameter section of the output shaft, and the sleeve is mounted on the larger diameter section of the output shaft. Thus, the installation of the spiral bevel gear is convenient.

Preferably, the primary gear set comprises a transmission shaft and a primary gear, the transmission shaft is rotatably mounted in the box body, one end of the transmission shaft is provided with external teeth and meshed with the spiral bevel gear, and the other end of the primary gear is fixedly mounted on the transmission shaft.

Preferably, the power transmission device further comprises a motor and a driving gear, the driving gear is fixedly mounted on an output shaft of the motor, a through hole communicated with the interior of the box body is formed in the box body, the motor is fixedly connected with the box body, the driving gear penetrates through the through hole to enter the box body, and the driving gear is meshed with the first-level gear.

Preferably, the gearbox comprises a driving gear, the driving gear is rotatably mounted in the box and meshed with the first-level gear, a through hole communicated with the interior of the box is formed in the box and located above the driving gear, and a spline hole is formed in the top of the driving gear. Thus, the installation between the motor and the reduction box is convenient.

Preferably, a vent plug is attached to the case, and the gas in the case can be discharged through the vent plug. Like this, can produce the heat when the reducing gear box operation, lead to the pressure grow in the box, through the pressure in the valve can effectual control box, and then guarantee the steady operation of reducing gear box.

Preferably, the tooth crest coefficient of the meshing teeth for transmission in the reduction gearbox is not less than 1.2. Like this, each meshing tooth is the thin high tooth, increases the contact ratio between each gear pair for noise when transmitting is littleer, and the transmission process is more steady

The technical scheme has the advantages that the spiral bevel gear and the output shaft are designed in a split mode, the spiral bevel gear is detachably connected with the output shaft, the output shaft and the spiral bevel gear are convenient to manufacture, and the spiral bevel gear is adjusted and fixed on the output shaft, so that the primary gear set can be easily and normally meshed with the spiral bevel gear, and the reduction gearbox is installed more quickly and accurately.

Drawings

Fig. 1 is a schematic structural view of a reduction gearbox with a vertical structure for an electric forklift.

Description of the drawings: 1. a box body; 11. through the hole; 12. an end cap; 2. a primary gear set; 21. a drive shaft; 22. a primary gear; 3. a secondary gear set; 31. an output shaft; 311. an output end; 32. a spiral bevel gear; 33. locking the nut; 34. a sleeve; 4. a driving gear; 5. a vent plug; 6. a ring gear; 7. a steering bearing; 8. a bearing; 9. and (7) oil sealing.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The orientations in the following embodiments are based on fig. 1, and in fig. 1, the position of the steering bearing 7 is "up", the position of the output shaft is "down", and the position of the output end 311 of the output shaft 31 is "left".

Example 1

As a vertical structure reducing gear box for electric fork-lift truck that figure 1 demonstrates, including box 1, one-level gear train 2, second grade gear train 3 and driving gear 4, one-level gear train 2 and second grade gear train 3 mesh in proper order, driving gear 4, one-level gear train 2 and second grade gear train 3 are all installed on box 1, second grade gear train 3 includes output shaft 31 and spiral bevel gear 32, 31 one end of output shaft stretches into in the box 1, output shaft 31 and box 1 normal running fit, spiral bevel gear 32 cover is established on output shaft 31, spiral bevel gear 32 can be fixed on the different positions of output shaft 31, spiral bevel gear 32 and the meshing of one-level gear train 2. Like this, be different from prior art, spiral bevel gear 32 and the integrative structure of output shaft 1, in this scheme, spiral bevel gear 32 and the design of the 31 components of a whole that can function independently of output shaft, so the preparation of spare part of being convenient for to through adjusting spiral bevel gear 32 position on output shaft 31 and fixing, the meshing between completion one-level gear train 2 and the spiral bevel gear 32 of the standard that can relax makes the installation of reducing gear box swift and accurate more.

In this embodiment, the secondary gear set 3 further includes a lock nut 33 and a plurality of sleeves 34 with different length specifications, one of the sleeves 34 is sleeved on the output shaft 31, the lock nut 33 is in threaded connection with the output shaft 31, the spiral bevel gear 32 is located between the sleeve 34 and the lock nut 33, and two ends of the spiral bevel gear 32 are respectively abutted against the sleeve 34 and the lock nut 31; the position of the spiral bevel gear 32 on the output shaft 31 is changed by replacing the sleeve 33 with a different length specification. Further, the output shaft 31 is attached to the housing 1 via a bearing 8, one end of the sleeve 34 abuts against an inner ring of the bearing 8, and the other end of the sleeve 34 abuts against the spiral bevel gear 32. Therefore, the sleeve 34 is limited by reasonably utilizing the connecting structure between the output shaft and the box body, so that the structure of the reduction gearbox is simpler and more compact. Further, a coupling key is provided between the output shaft 31 and the spiral bevel gear 32, and the coupling key prevents the spiral bevel gear 32 from rotating radially. In this way, the stability of the spiral bevel gear 32 can be increased, while facilitating the installation of the spiral bevel gear 32. Further, the output shaft 31 is a stepped shaft, the lock nut 33 is in threaded connection with a section of the output shaft 31 with a smaller diameter, the sleeve 34 is installed on the section of the output shaft with a larger diameter, and two ends of the spiral bevel gear 32 are respectively arranged on the two sections. In this way, the mounting and securing of the sleeve 34 and the helical bevel gear 32 is facilitated. In this embodiment, the right end of the box 1 is provided with an opening communicated with the inside of the box, an end cover 12 is fixedly installed at the opening, the opening is sealed by the end cover 12, the right end of the output shaft 32 is supported on the end cover 12 through a bearing 8, and the bearing 8 is a tapered roller bearing. So set up, the installation of the second grade gear train of being convenient for. Further, the left end of the output shaft 32 is located outside the box 1, the left end of the output shaft 32 is an output end 311, and the output end 311 is used for connecting components such as wheels.

In this embodiment, the primary gear set 2 includes a transmission shaft 21 and a primary gear 22, the transmission shaft 21 is rotatably installed in the case 1, the primary gear 22 is fixedly installed on the transmission shaft 21, the transmission shaft 21 is engaged with the spiral bevel gear 32, and the primary gear 22 is engaged with the driving gear 4. Further, one end of the transmission shaft 21 is provided with external teeth, and the transmission shaft 21 is engaged with the spiral bevel gear 32 through the external teeth.

In this embodiment, still include the motor, the motor is fixed on box 1, and the output shaft fixed connection of driving gear 4 and motor sets up the clearing hole rather than inside intercommunication on the box 1, and when the motor was fixed on box 1, inside driving gear 4 passed the clearing hole and got into box 1 to driving gear 4 and one-level gear 22 meshing.

In other embodiments, the driving gear 4 is rotatably installed in the case 1, a spline hole is formed in the top of the driving gear 4, and an output shaft of the motor passes through the spline hole to be connected with the driving gear 4 through a spline.

In this embodiment, the vent plug 5 is installed on the box body 1, and in the operation process of the reduction gearbox, the temperature in the box body 1 rises due to heat generated in the transmission process, so that the pressure in the box body 1 becomes large, and at the moment, high-temperature and high-pressure gas in the box body 1 can be discharged through the vent plug 5. Therefore, the balance of the temperature and the pressure in the box body is kept, and the reduction gearbox runs stably. Further, the vent plug 5 is a one-way valve. Thus, the external impurities are prevented from entering the box body, and the environmental pollution in the box body is avoided.

In this embodiment, a gear ring 6 is fixedly mounted on the top of the box 1, a steering bearing 7 is mounted in the gear ring 6, an inner ring of the steering bearing 7 is fixedly connected with the gear ring 6, and an axis of the gear ring 6 is perpendicular to an axis of the output shaft 31. Like this, install the reducing gear box on fork truck after, turn to the outer lane and the automobile body fixed connection of bearing, fork truck just can drive the reducing gear box through the ring gear when turning to and turn to for the reducing gear box has and turns to and drive two kinds of functions, very big improvement the practicality of reducing gear box.

In this embodiment, the crest coefficient of the meshing teeth of the drive gear 4, the primary gear set 2, the secondary gear set 3, and the like in the reduction gearbox is not less than 1.2. So set up, each meshing tooth is the thin high tooth, increases the contact ratio between each gear pair for noise when the transmission is littleer, and transmission process is more steady.

The transmission process of the vertical structure reduction gearbox for the electric forklift is as follows: when the motor is started, the motor drives the driving gear 4 to rotate through an output shaft of the motor, the driving gear 4 drives the first-stage gear 22 to rotate, the first-stage gear 22 drives the transmission shaft 21 to rotate, the transmission shaft 21 drives the spiral bevel gear 32 to rotate through external teeth, and the spiral bevel gear 32 drives the output shaft 31 to rotate.

The reduction gearbox with the vertical structure for the electric forklift can be used for wheel-side driving of vehicles, and wheels are mounted at the other end of the output shaft 31. When the wheels need to move, the reduction gearbox drives the wheels to rotate through the output shaft 31 after completing the transmission process; when the vehicle turns, the gear ring 6 is driven to rotate, the gear ring 6 drives the box body 1 to rotate around the axis of the gear ring 6, and the box body 1 drives the output shaft 31 to rotate around the axis of the gear ring 6, so that the vehicle turning action is completed.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.

Claims (10)

1. The utility model provides an electric fork-lift uses vertical structure reducing gear box, includes box (1), one-level gear train (2) and secondary gear train (3), and one-level gear train (2) and secondary gear train (3) are installed on box (1), and one-level gear train (2) and secondary gear train (3) meshing transmission, its characterized in that: the secondary gear set (3) comprises an output shaft (31), a spiral bevel gear (32), a locking nut (33) and a sleeve (34), one end of the output shaft (31) extends into the box body (1), the output shaft (31) is rotatably installed on the box body (1), the spiral bevel gear (32), the locking nut (33) and the sleeve (34) are sleeved on the output shaft (31), the locking nut (33) is in threaded connection with the output shaft (31), the spiral bevel gear (32) is located between the sleeve (34) and the locking nut (33), the left end and the right end of the spiral bevel gear (32) are respectively abutted against the sleeve (34) and the locking nut (33), the spiral bevel gear (32) can be axially fixed through the sleeve (34) and the locking nut (33), a connecting key is arranged between the spiral bevel gear (32) and the output shaft (31), the spiral bevel gear (32) can be radially fixed through the connecting key, the spiral bevel gear (32) is meshed with the primary gear set (2).

2. The vertical structure reduction gearbox for the electric forklift according to claim 1, characterized in that: one end of the output shaft (31) is an output end (311), the output end (311) is positioned on the left side of the box body (1), the other end of the output shaft (31) extends rightwards to enter the box body (1), the output shaft (31) is installed on the box body (1) through a bearing (8), and an oil seal (9) for preventing oil in the box body (1) from leaking is further arranged between the output shaft (31) and the box body (1); two ends of the sleeve (34) are respectively abutted against the inner ring of the bearing (8) and the spiral bevel gear (32).

3. The vertical structure reduction gearbox for the electric forklift as claimed in claim 2, wherein: the bearing (8) is a tapered roller bearing.

4. The vertical structure reduction gearbox for the electric forklift as claimed in claim 2, wherein: an opening communicated with the inside of the box body (1) is formed in the right side of the box body, an end cover (12) is fixedly installed at the opening, the opening is blocked by the end cover (12), and the right end of the output shaft (31) is supported on the end cover (12) through a bearing (8).

5. The vertical structure reduction gearbox for the electric forklift according to claim 1, characterized in that: the output shaft (31) is a step shaft, the locking nut (33) is installed on the section with the smaller diameter on the output shaft (31), and the sleeve (34) is installed on the section with the larger diameter on the output shaft (31).

6. The vertical structure reduction gearbox for the electric forklift according to claim 1, characterized in that: the primary gear set (2) comprises a transmission shaft (21) and a primary gear (22), the transmission shaft (21) is rotatably installed in the box body (1), one end of the transmission shaft (21) is provided with external teeth and is meshed with the spiral bevel gear (32), and the other end of the primary gear (22) is fixedly installed on the transmission shaft (21).

7. The vertical structure reduction gearbox for the electric forklift as recited in claim 6, wherein: still include motor and driving gear (4), driving gear (4) fixed mounting is on the output shaft of motor, offer on box (1) with the inside clearing hole (11) of intercommunication of box (1), motor and box (1) fixed connection, in driving gear (4) passed clearing hole (11) and get into box (1), driving gear (4) and one-level gear (22) meshing.

8. The vertical structure reduction gearbox for the electric forklift as recited in claim 6, wherein: still include driving gear (4), driving gear (4) rotate to be installed in box (1), driving gear (4) and one-level gear (22) meshing, offer on box (1) with the inside clearing hole (11) that communicate of box (1), clearing hole (11) are located driving gear (4) top, the splined hole has been seted up at the top of driving gear (4).

9. The reduction gearbox with vertical structure for the electric forklift as claimed in claim 1, wherein: the box body (1) is provided with a vent plug (5), and gas in the box body (1) can be discharged through the vent plug (5).

10. The vertical structure reduction gearbox for electric forklifts according to any one of claims 1-9, characterized in that: the tooth crest coefficient of the meshing teeth for transmission in the reduction gearbox is not less than 1.2.

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