Forklift drive system and forklift

Abstract

The utility model discloses a fork truck drive system and fork truck, including drive axle, speed reducer and drive motor, the casing of drive axle is equipped with bridge package, and the speed reducer is assembled at this bridge package, and the output shaft of drive motor is connected with the speed reducer, drive axle sets up and is used for connecting the first connecting piece and second connecting piece of fork truck frame along its axial direction distribution, first connecting piece, second connecting piece all are integrally formed with the casing of drive axle, drive motor is located the one side of speed reducer close to first connecting piece, bridge package deviates the middle part of drive axle, and shifts to the side close to second connecting piece, to make drive axle reserve the disassembly space of drive motor between first connecting piece and speed reducer, the utility model discloses significantly improve the rigidity and torsional rigidity of first connecting piece, second connecting piece, therefore, only need first connecting piece, second connecting piece and the reliable fixed of fork truck frame, can ensure the high stability connection of drive axle whole and fork truck frame.

Description

Technical Field

[0001] This utility model relates to the field of forklift technology, and in particular to a forklift drive system and a forklift. Background Technology

[0002] Currently, the drive system of an electric counterbalance forklift mainly consists of a drive motor 3, a reducer 2, and a drive axle 1. The drive axle 1 is typically connected to the forklift frame 7 via a rotating support plate (not shown in the figure), and a frame fixing point 21 is provided on the reducer housing. This is secured to the corresponding support structure 71 on the forklift frame 7 by fixing bolts 8. Figure 1 As shown. However, this traditional design has obvious drawbacks: the structural layout is loose, requiring an additional support structure 71 for the reducer 2 to be added to the forklift frame 7, which not only increases manufacturing costs but also poses a safety hazard due to the easy breakage of the fixing bolts 8, while also causing inconvenience for after-sales maintenance. In addition, the axle housing 11 of the drive axle 1 is centrally located, resulting in insufficient disassembly space for the drive motor 3 during maintenance, further reducing maintenance efficiency. Utility Model Content

[0003] This utility model addresses the technical problems existing in the prior art by providing a forklift drive system and forklift. Through structural improvements, it simplifies the layout, enhances reliability, eliminates safety hazards, and improves the ease of maintenance.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a forklift drive system, including a drive axle, a reducer, and a drive motor. The drive axle is provided with an axle housing, the reducer is mounted on the axle housing, and the output shaft of the drive motor is connected to the reducer. The drive axle is provided with a first connector and a second connector distributed along its axial direction for connecting with the forklift frame. The first connector and the second connector are both integrally formed with the housing of the drive axle. The drive motor is located on the side of the reducer near the first connector, and the axle housing is offset from the middle of the drive axle and shifted towards the side near the second connector, so that the drive axle reserves space for the disassembly of the drive motor between the first connector and the reducer.

[0005] In a preferred embodiment, the housing of the drive axle is an integrally formed structure, including an integrally formed long axle tube, a short axle tube, and the axle housing. The long axle tube and the short axle tube are coaxially arranged, and the long axle tube is longer than the short axle tube. The axle housing is located between the long axle tube and the short axle tube. The first connector is integrally formed on the long axle tube, and the second connector is integrally formed on the short axle tube.

[0006] In a preferred embodiment, the drive axle is further provided with a plurality of third connectors for connecting to the forklift mast, each third connector being integrally formed with the housing of the drive axle, and each third connector being hook-shaped and extending downward.

[0007] In a preferred embodiment, the third connector includes two connecting portions spaced apart along the axial direction of the drive axle. The top surfaces of the two connecting portions are concave arc surfaces, and the two connecting portions are respectively provided with connecting holes that pass through from top to bottom.

[0008] In a preferred embodiment, the third connector further includes a reinforcing portion connected between the two connecting portions, the top surface of which is lower than the top surface of the connecting portions and has a concave arc surface.

[0009] In a preferred embodiment, the upper periphery of the connecting hole is chamfered, and the width of the chamfers on both sides along the first direction is smaller than the width of the chamfers on both sides along the second direction. The first direction is the axial direction of the drive axle, and the second direction is perpendicular to the first direction.

[0010] In a preferred embodiment, the chamfer around the connecting hole is elliptical, with the major axis of the ellipse located in the second direction and the minor axis located in the first direction.

[0011] In a preferred embodiment, both the first connector and the second connector are plate-shaped structures, and the first connector and the second connector extend outward along the radial direction of the drive axle and are provided with a plurality of fixing holes.

[0012] In a preferred embodiment, the housing of the reducer is connected to the bridge assembly by a plurality of first mounting bolts, and the housing of the drive motor is connected to the housing of the reducer by a plurality of second mounting bolts; the reducer is configured as a two-stage reduction structure.

[0013] In a preferred embodiment, brakes are coaxially connected to both ends of the drive axle.

[0014] This utility model also provides a forklift, including a forklift frame and a forklift drive system as described above, wherein the first connector and the second connector are respectively fixedly connected to the forklift frame.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The first and second connecting parts of this utility model are integrally formed with the drive axle housing, optimizing the mating structure between the first and second connecting parts and the drive axle. This significantly improves the rigidity and torsional resistance of the first and second connecting parts, completely eliminating the risk of rotational displacement between them relative to the drive axle. This design ensures a highly stable connection between the drive axle and the forklift frame solely through the reliable fixing of the first and second connecting parts to the forklift frame, thus eliminating the need for additional support structures on the traditional frame and removing the frame fixing points on the reducer housing. This improvement eliminates the traditional loose layout, reducing manufacturing costs and fundamentally avoiding the risk of bolt breakage. It also simplifies the assembly process and improves normal structural reliability. Furthermore, the removal of the frame fixing points on the reducer housing provides crucial structural optimization space for the axle package offset setting of the drive axle. This utility model, through the axle package offset setting, provides sufficient disassembly space for drive motor maintenance, significantly improving maintenance convenience.

[0017] 2. The drive axle housing is a one-piece molded structure, which reduces connection points, improves overall strength and rigidity, and can better withstand high torque and high load, while simplifying the assembly process.

[0018] 3. The third connector used for connecting with the forklift mast is integrally molded with the drive axle housing, which optimizes the mating structure between the third connector and the drive axle and significantly improves the rigidity and torsional resistance of the third connector.

[0019] 4. The present invention provides a reinforcing part between the two connecting parts of the third connector, which significantly improves the strength of the two reinforcing parts of the third connector and greatly reduces the risk of the connecting parts breaking.

[0020] 5. The upper periphery of the connecting hole is chamfered, and the width of the chamfer on both sides along the first direction is smaller than the width of the chamfer on both sides along the second direction. This makes the upper end of the connecting hole of this utility model adopt a non-uniform width chamfer design. By increasing the width of the chamfer in the second direction to form a guide slope, the ease of bolt assembly is significantly improved. At the same time, the width of the chamfer on both sides of the first direction is reduced, retaining more material thickness and effectively enhancing the fracture resistance of the connection part on both sides of the first direction. This differentiated chamfer structure optimizes the strength distribution of key stress areas while ensuring smooth installation, making the entire connection part both easy to install and highly reliable. In particular, the upper end of the connecting hole adopts an elliptical chamfer design, which cleverly integrates the dual advantages of guiding function and structural reinforcement. The major axis of the ellipse is set in the second direction, forming a natural guide slope, which significantly improves the smoothness of assembly; the minor axis is arranged along the first direction, maximizing the preservation of material integrity and effectively enhancing the fatigue resistance of the connection part. This elliptical chamfer design not only optimizes stress distribution, but also achieves a perfect balance between ease of installation and structural reliability.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the forklift drive system and forklift of the present invention are not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is a structural diagram of a forklift drive system and forklift frame in a combined state, according to existing technology.

[0023] Figure 2 This is an exploded view of the forklift drive system of this utility model;

[0024] Figure 3 This is a schematic diagram of the drive axle of this utility model;

[0025] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0026] Figure 5 This is a schematic diagram of the forklift drive system of this utility model. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the forklift drive system of this utility model. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the forklift drive system and forklift frame in the combined state of this utility model;

[0029] In the diagram, 1. Drive axle; 11. Axle housing; 12. First connector; 13. Second connector; 14. Third connector; 141. Connecting part; 142. Connecting hole; 143. Reinforcing part; 144. Chamfer; 15. Fixing hole; 16. Long axle tube; 17. Short axle tube; 2. Reducer; 3. Drive motor; 4. First mounting bolt; 5. Second mounting bolt; 6. Brake; 7. Forklift frame; 71. Support structure; 8. Fixing bolt. Detailed Implementation

[0030] In this utility model, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," and "rear" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In addition, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] Please see Figures 2-7 As shown, this utility model discloses a forklift drive system, including a drive axle 1, a reducer 2, and a drive motor 3. The drive axle 1 has a housing with a bridge assembly 11, and the reducer 2 is mounted on the bridge assembly 11. The output shaft of the drive motor 3 is connected to the reducer 2. The drive axle 1 has a first connecting member 12 and a second connecting member 13 distributed along its axial direction for connecting to the forklift frame 7. Both the first connecting member 12 and the second connecting member 13 are integrally formed with the housing of the drive axle 1. Specifically, the first connecting member 12 and the second connecting member 13 are integrally cast with the housing of the drive axle 1. The drive motor 3 is located on the side of the reducer 2 closer to the first connecting member 12. The bridge assembly 11 is offset from the center of the drive axle 1 and shifted towards the side closer to the second connecting member 13, so that space is reserved between the drive axle 1 and the first connecting member 12 for disassembling the drive motor 3.

[0033] Preferably, the housing of the drive axle 1 is a one-piece molded structure, which can reduce the number of connection points, improve the overall strength and rigidity, better withstand high torque and high load, and simplify the assembly process. Specifically, the housing of the drive axle 1 includes a one-piece molded long axle tube 16, a short axle tube 17, and an axle housing 11. The long axle tube 16 and the short axle tube 17 are coaxially arranged, with the long axle tube 16 being longer than the short axle tube 17. The axle housing 11 is located between the long axle tube 16 and the short axle tube 17, thereby achieving the offset of the axle housing 11. The length difference between the long axle tube 16 and the short axle tube 17 is used to reserve space for the disassembly of the drive motor 3 between the first connector 12 and the reducer 2.

[0034] The drive axle 1 is also provided with a plurality of third connectors 14 for connecting to the forklift mast 7. Each third connector 14 is integrally formed with the housing of the drive axle 1, and each third connector 14 is hook-shaped and extends downward. In this embodiment, there are two third connectors 14, which are distributed along the axial direction of the drive axle 1 and are close to the locations of the first connector 12 and the second connector 13, respectively. Specifically, one third connector 14 is integrally formed with the long axle tube 16, and the other third connector 14 is integrally formed with the short axle tube 17.

[0035] like Figure 3 , Figure 4As shown, the third connector 14 includes two connecting portions 141 spaced apart along the axial direction of the drive axle 1. The top surfaces of the two connecting portions 141 are concave arc surfaces, and each connecting portion 141 is provided with a vertically penetrating connecting hole 142. The top surfaces of the two connecting portions 141 are used to place the spherical bearing, and are connected to both ends of the spherical bearing through bolts via the connecting holes 142.

[0036] In a preferred embodiment, the third connector 14 further includes a reinforcing portion 143 connected between the two connecting portions 141. This reinforcing portion 143 is also integrally formed with the housing of the drive axle 1 and integrally connected to the two connecting portions 141. The top surface of the reinforcing portion 143 is lower than the top surface of the connecting portion 141 and has a concave arc surface to avoid the center of the spherical bearing. By providing the reinforcing portion 143, this invention significantly improves the strength of the two connecting portions 141 of the third connector 14, greatly reducing the risk of breakage of the connecting portions 141.

[0037] like Figure 4 As shown, the upper periphery of the connecting hole 142 is provided with a chamfer 144, and the width of the chamfers 144 on both sides along the first direction is smaller than the width of the chamfers 144 on both sides along the second direction. The first direction is the axial direction of the drive axle 1, and the second direction is perpendicular to the first direction. Figure 3 In this design, the first direction is left-right, and the second direction is roughly front-back. Therefore, the upper end of the connecting hole 142 adopts a non-uniform width chamfer 144 design. By increasing the width of the chamfer 144 in the second direction to form a guide slope, the ease of bolt assembly is significantly improved. At the same time, the width of the chamfer 144 on both sides of the first direction is reduced, retaining more material thickness and effectively enhancing the fracture resistance of the connecting part 141 on both sides of the first direction. This differentiated chamfer structure ensures smooth installation while optimizing the strength distribution of key stress areas, making the entire connecting part 141 both easy to install and highly reliable.

[0038] Preferably, the chamfer 144 around the connecting hole 142 is elliptical, with the major axis of the ellipse located in the second direction and the minor axis located in the first direction. Therefore, the upper end of the connecting hole 142 of this invention adopts an elliptical chamfer 144 design, which cleverly integrates the dual advantages of guiding function and structural reinforcement. The major axis of the elliptical chamfer 144 forms a natural guide slope, significantly improving assembly smoothness; the minor axis direction maximizes the preservation of material integrity, effectively enhancing the fatigue resistance of the connecting part 141. This elliptical chamfer 144 design not only optimizes stress distribution but also achieves a perfect balance between ease of installation and structural reliability.

[0039] In this embodiment, the first connector 12 and the second connector 13 are plate-shaped structures, and the first connector 12 and the second connector 13 extend outward along the radial direction of the drive axle 1, and are provided with a plurality of fixing holes 15. Specifically, the first connector 12 and the second connector 13 are respectively forked to form two support arms, and each support arm is provided with two fixing holes 15 for installation and fixing.

[0040] The housing of the reducer 2 is connected to the axle housing 11 of the drive axle 1 using multiple first mounting bolts 4, and the housing of the drive motor 3 is connected to the housing of the reducer 2 using multiple second mounting bolts 5. This connection method using first mounting bolts 4 and second mounting bolts 5 allows for quick disassembly of the reducer 2 and the drive motor 3 while ensuring the stability of the connection. The reducer 2 is configured as a two-stage reduction structure, which can meet the system's precise requirements for the transmission ratio. Brakes 6 are coaxially connected to both ends of the drive axle 1.

[0041] This utility model discloses a forklift drive system. By integrally molding the first connecting member 12 and the second connecting member 13 with the housing of the drive axle 1, the mating structure of the first connecting member 12, the second connecting member 13, and the drive axle 1 is optimized, significantly improving the rigidity and torsional resistance of the first connecting member 12 and the second connecting member 13, and completely eliminating the risk of rotational displacement between them relative to the drive axle 1. Therefore, during assembly, a reliable connection between the drive axle 1 and the forklift frame 7 via the first connecting member 12 and the second connecting member 13 ensures a highly stable connection between the drive axle 1 and the forklift frame 7. Figure 7 As shown. This improvement eliminates the traditional loose layout and eliminates the need for additional support structures on the traditional forklift frame, as well as the frame fixing points on the reducer 2 housing. This not only reduces manufacturing costs but also fundamentally avoids the risk of bolt breakage, while simplifying the assembly process and improving normal structural reliability. The elimination of the frame fixing points on the reducer 2 housing provides crucial structural optimization space for the offset setting of the axle housing 11 of the drive axle 1. Based on this, this invention, through the offset setting of the axle housing 11, reserves sufficient disassembly space for the drive motor 3 during maintenance, significantly improving the ease of maintenance of the drive motor 3.

[0042] Please see Figure 7As shown, a forklift according to this utility model includes a forklift frame 7 and a forklift drive system as described above. A first connecting member 12 and a second connecting member 13 are respectively fixedly connected to the forklift frame 7. The term "fixed connection" means that the first connecting member 12 and the second connecting member 13 form a reliable and relatively fixed connection with the forklift frame 7. This connection method can be designed as detachable or non-detachable according to actual needs to meet different application scenarios. Specifically, in this embodiment, the first connecting member 12 and the second connecting member 13 are reliably connected to the forklift frame 7 using bolt assemblies and fixing holes 15. Therefore, the forklift frame 7 does not require an additional support structure for connecting to the housing of the reducer 2.

[0043] The forklift of this utility model is an electric counterbalance forklift, especially a small-tonnage (1.5t, 2.0t, 2.5t) electric counterbalance forklift.

[0044] The present invention relates to a forklift drive system and a forklift. The parts not described herein are the same as or can be implemented using existing technologies.

[0045] The above embodiments are only used to further illustrate a forklift drive system and forklift of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A forklift drive system, comprising a drive axle, a reducer, and a drive motor, wherein the drive axle housing has an axle housing, the reducer is mounted on the axle housing, and the output shaft of the drive motor is connected to the reducer; the drive axle is provided with a first connecting member and a second connecting member distributed along its axial direction for connection with a forklift frame; characterized in that: Both the first connector and the second connector are integrally formed with the housing of the drive axle; the drive motor is located on the side of the reducer closer to the first connector, and the axle housing is offset from the middle of the drive axle and shifted to the side closer to the second connector, so that the drive axle leaves space for the disassembly of the drive motor between the first connector and the reducer.

2. The forklift drive system according to claim 1, characterized in that: The drive axle housing is an integrally formed structure, including an integrally formed long axle tube, a short axle tube, and the axle housing. The long axle tube and the short axle tube are coaxially arranged, and the long axle tube is longer than the short axle tube. The axle housing is located between the long axle tube and the short axle tube. The first connector is integrally formed on the long axle tube, and the second connector is integrally formed on the short axle tube.

3. The forklift drive system according to claim 1 or 2, characterized in that: The drive axle is also provided with a plurality of third connectors for connecting to the forklift mast. Each third connector is integrally formed with the housing of the drive axle and is hook-shaped and extends downward.

4. The forklift drive system according to claim 3, characterized in that: The third connector includes two connecting parts spaced apart along the axial direction of the drive axle. The top surfaces of the two connecting parts are concave arc surfaces, and the two connecting parts are respectively provided with connecting holes that pass through from top to bottom.

5. The forklift drive system according to claim 4, characterized in that: The third connector also includes a reinforcing portion connected between the two connecting portions, the top surface of which is lower than the top surface of the connecting portions and has a concave arc surface.

6. The forklift drive system according to claim 4, characterized in that: The upper periphery of the connecting hole is chamfered, and the width of the chamfer on both sides along the first direction is smaller than the width of the chamfer on both sides along the second direction. The first direction is the axial direction of the drive axle, and the second direction is perpendicular to the first direction.

7. The forklift drive system according to claim 6, characterized in that: The connecting hole has elliptical chamfers around its perimeter, with the major axis of the ellipse located in the second direction and the minor axis located in the first direction.

8. The forklift drive system according to claim 1, characterized in that: Both the first connector and the second connector are plate-shaped structures, and the first connector and the second connector extend outward along the radial direction of the drive axle and are provided with multiple fixing holes.

9. The forklift drive system according to claim 1, characterized in that: The reducer housing is connected to the axle housing by a plurality of first mounting bolts, and the drive motor housing is connected to the reducer housing by a plurality of second mounting bolts; the reducer is configured as a two-stage reduction structure; brakes are coaxially connected to both ends of the drive axle.

10. A forklift, comprising a forklift frame, characterized in that: It also includes a forklift drive system as described in any one of claims 1-9, wherein the first connector and the second connector are respectively fixedly connected to the forklift frame.

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