Forklift driving wheel assembly and forklift

Abstract

The utility model relates to the technical field of vehicles, in particular to a forklift driving wheel assembly and a forklift. The forklift driving wheel assembly comprises an installation support and a driving wheel, the installation support comprises an installation part and a supporting part arranged on one side of the installation part in a protruding mode, a transition slope surface structure is arranged between the installation part and the supporting part, and the thickness of the transition slope surface structure is gradually increased from top to bottom; the driving wheel is rotationally arranged on the side, connected with the transition slope surface structure, of the supporting part, the transition slope surface structure comprises a first slope surface and at least one second slope surface, and the first slope surface is connected with the second slope surface; circle centers corresponding to projections of an outer edge arc line of the first slope surface, an outer edge arc line of the second slope surface and a butt joint arc line of the first slope surface and the second slope surface in a plane perpendicular to the axis of the driving wheel are respectively arranged in a staggered manner. The arrangement of the transition slope surface structure can ensure that the mounting bracket is still stable after being used for a long time; the driving wheels are of a single-side supporting structure, and the requirements for light weight and compactness of the forklift can be met.

Description

Technical Field

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

[0002] Forklifts are industrial material handling vehicles, referring to various wheeled handling vehicles used for loading, unloading, stacking, and short-distance transportation of palletized goods. They play a crucial role in enterprise logistics systems and are the mainstay of material handling equipment. Among them, electric forklifts driven by motors are gradually replacing internal combustion forklifts and manual forklifts due to their advantages of no pollution, low noise, and flexibility.

[0003] The drive wheel assembly of an electric forklift is a crucial component. It typically includes a drive bracket, a drive motor mounted on the bracket, and drive wheels. A wheel groove is formed at the bottom of the drive bracket, and the drive wheels reside within this groove. The two ends of the drive wheels are rotatably mounted on opposite walls of the groove via bearings. This double-sided support method ensures the stability of the drive wheel installation; however, this structure results in a heavier drive wheel assembly and a greater thickness in the axial direction of the drive wheels, requiring more space for reversing motion. This does not meet the current requirements for lightweight and compact design.

[0004] Therefore, there is an urgent need to propose a forklift drive wheel assembly to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a forklift drive wheel assembly and forklift that can reduce the overall weight of the drive wheel assembly and the thickness along the axial direction of the drive wheel while ensuring stable installation of the drive wheel, thereby meeting the requirements of lightweight and compact design.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A forklift drive wheel assembly, comprising:

[0008] The mounting bracket includes a mounting part and a support part protruding from one side of the mounting part. A transition slope structure is provided between the mounting part and the support part, and the thickness of the transition slope structure gradually increases from top to bottom.

[0009] A drive wheel is rotatably mounted on the side of the support unit that connects to the transition slope structure.

[0010] The transition slope structure includes a first slope and at least one second slope. The first slope and the second slope are connected. The outer edge arc of the first slope, the outer edge arc of the second slope, and the connecting arc of the first slope and the second slope are respectively offset in the center of the circle corresponding to the projection in a plane perpendicular to the axis of the drive wheel.

[0011] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the first slope, the second slope, and the corresponding multiple circles whose centers are collinear are arranged along the arc projection of the first slope and the second slope.

[0012] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the second slope covers the outside of the support portion, and the first slope is located above the second slope and partially covers the outside of the second slope.

[0013] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the first slope includes at least two arc surfaces connected in sequence, and the two adjacent arc surfaces are transitioned by rounded corners.

[0014] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the first slope includes a first arc surface, a second arc surface and a third arc surface arranged sequentially from top to bottom, the two opposite edges of the second arc surface are respectively connected to the first arc surface and the third arc surface, and the ends of the two edges of the second arc surface are connected together.

[0015] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the chamfer between the first slope and the mounting part is 10°~20°; and / or

[0016] The chamfer between the first slope and the second slope is 10° to 20°.

[0017] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the slope of the first slope in the vertical plane is 2.5~3.0, the slope of the second slope is 0.50~0.55, and the ratio of the lengths of the first slope and the second slope in the circumferential direction is 0.25~0.30.

[0018] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the support part is provided with a through mounting hole, and the drive wheel is rotatably mounted in the mounting hole via a wheel axle.

[0019] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, at least one bearing is provided between the wheel axle and the mounting hole, and the projection of the second slope surface on the horizontal plane can cover at least one of the bearings.

[0020] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, a limiting part is formed by protrusion on the inner sidewall of the mounting hole, and two bearings are provided. The two bearings are arranged on opposite sides of the limiting part, and the end faces of the two bearings near the limiting part abut against the sidewall of the limiting part respectively.

[0021] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the projection of the first slope on the horizontal plane covers the mounting hole.

[0022] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the first slope is an axisymmetric structure, and the thickness of the first slope gradually decreases from the axis of symmetry M to both ends. The axis of symmetry M of the first slope is parallel to the vertical direction and passes through the center of the mounting hole.

[0023] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the drive wheel includes a hub and a wheel. The hub is mounted on the axle and fixedly connected to the axle. The wheel is mounted on the hub and fixedly connected to the hub. The drive wheel rotates with the axle, and the axes of the two are collinear and rotate synchronously.

[0024] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the wheel hub includes a first wheel hub and a second wheel hub. The first wheel hub is fitted on the axle and extends outward to form a first mounting portion. The wheel component is fitted on the outer end face of the second wheel hub. The second wheel hub extends towards the first wheel hub to form a second mounting portion. The outer end face of the first mounting portion abuts against the inner sidewall of the second wheel hub, and the outer end face of the second mounting portion abuts against the outer sidewall of the first wheel hub. The sidewalls of the first mounting portion and the second mounting portion are fitted together and fixedly connected by a locking member.

[0025] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the first wheel hub is recessed on the side facing the support portion to form a clearance groove. The clearance groove is inserted into the mounting hole near the inner wall of the wheel axle, and a seal is filled between the clearance groove and the mounting hole. A clearance gap is formed between the inner wall of the clearance groove away from the wheel axle and the support portion.

[0026] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the mounting part is integrated with a cantilever part on the side opposite to the support part. The upper end of the cantilever part is used to support the body of the forklift, and the projection of the center point of the support point in the horizontal plane falls on the projection of the axis of the drive wheel in the horizontal plane.

[0027] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the lower end of the cantilever portion is adapted to the end face shape of the drive wheel, and a wheel accommodating space is formed between it and the support portion.

[0028] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, a weight reduction groove is provided on the cantilever portion, and the weight reduction groove is recessed in the vertical plane towards the mounting portion.

[0029] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the forklift drive wheel assembly further includes a drive mechanism, the drive mechanism including a drive source disposed on the mounting bracket and a gear reduction assembly connected to the output end of the drive source, the drive source driving the drive wheel to rotate through the gear reduction assembly.

[0030] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the gear reduction assembly includes at least three sequentially meshing reduction gears, and the center line connecting the at least three reduction gears is set at an angle to the vertical direction.

[0031] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the mounting bracket further includes a side cover, and the mounting part is provided with a receiving cavity for accommodating the gear reduction assembly, and the side cover can seal the opening of the receiving cavity.

[0032] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, a pressure relief valve is also provided on the mounting part. The pressure relief valve is located above the liquid stored in the accommodating cavity and is used to connect the accommodating cavity with the outside.

[0033] As a preferred embodiment of the forklift drive wheel assembly provided by this utility model, the mounting bracket is made of aluminum material.

[0034] This utility model also provides a forklift, including a forklift body and a forklift drive wheel assembly as described above, wherein the forklift drive wheel assembly is disposed on the forklift body.

[0035] The beneficial effects of this utility model are as follows:

[0036] The forklift drive wheel assembly provided by this utility model adopts a single-sided support structure with the drive wheel positioned on one side of the support portion, and a transition slope structure between the mounting portion and the support portion. This allows stress concentration to be transferred to the hub of the drive wheel, with the stress concentration being surface stress. By increasing the area, local deformation is reduced, thus ensuring the structural stability of the mounting bracket during long-term use. Furthermore, the single-sided support structure can also reduce the overall weight of the drive wheel assembly and the thickness along the axial direction of the drive wheel to a certain extent, thereby meeting the requirements of lightweighting and compactness. By staggering the centers of the outer edge arcs of the first slope, the outer edge arcs of the second slope, and the connecting arcs of the first and second slopes in a plane perpendicular to the wheel axle, the stress concentration point is placed on the transition slope structure. After the force acts on the first and second slopes, the force path is changed in multiple directions due to the non-uniform transition between them, thus optimizing the force transmission path, avoiding significant stress concentration, and ensuring structural stability during long-term use.

[0037] The forklift provided by this utility model, by applying the above-mentioned forklift drive wheel assembly, can reduce the overall weight of the drive wheel assembly and the thickness along the axial direction of the drive wheel while ensuring stable installation of the drive wheel, thereby meeting the requirements of lightweight and compactness. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the forklift drive wheel assembly provided in this embodiment of the utility model;

[0040] Figure 2 This is a cross-sectional schematic diagram of the forklift drive wheel assembly provided in an embodiment of the present utility model;

[0041] Figure 3 This is a schematic diagram of the mounting bracket provided in an embodiment of the present invention from one perspective;

[0042] Figure 4 This is a schematic diagram of the mounting bracket provided in an embodiment of the present invention from another perspective;

[0043] Figure 5 This is a cross-sectional schematic diagram of the mounting bracket provided in an embodiment of this utility model;

[0044] Figure 6 This is a schematic diagram of the parameters of the forklift drive wheel assembly provided in this embodiment of the utility model;

[0045] Figure 7 This is a partial exploded view of the forklift drive wheel assembly provided in this embodiment of the utility model;

[0046] Figure 8 This is a schematic diagram of the hidden mounting bracket for the forklift drive wheel assembly provided in this embodiment of the utility model;

[0047] Figure 9 This is a schematic diagram of the structure of the driving source provided in an embodiment of this utility model;

[0048] Figure 10 This is an exploded view of the planetary gear assembly provided in this embodiment of the present invention.

[0049] The markings in the image are as follows:

[0050] 1-Mounting bracket; 11-Mounting part; 111-Receiving cavity; 101-First side; 102-Second side;

[0051] 12-Support part; 121-Mounting hole; 122-Limiting part;

[0052] 13-Transition slope structure; 131-First slope; 1311-First arc surface; 1312-Second arc surface; 1313-Third arc surface; 132-Second slope;

[0053] 14-Cantilever section; 141-Weight reduction groove; 15-Wheel housing space; 16-Side cover; 17-Pressure relief valve;

[0054] 2-Drive wheel; 21-Hub assembly; 211-First hub; 212-Second hub; 213-First mounting part; 214-Second mounting part; 215-Grace clearance groove; 22-Wheel assembly;

[0055] 3-Axle; 4-Bearing; 5-Connecting flange;

[0056] 6-Drive mechanism; 61-Drive source; 62-Gear reduction assembly; 621-First stage reduction gear; 622-Second stage reduction gear; 623-Third stage reduction gear; 63-Planetary gear assembly; 631-Gear ring; 6311-Internal gear; 632-Sun gear; 633-Planetary gear; 634-Gear carrier; 6341-Pivot hole. Detailed Implementation

[0057] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the structural components relevant to the present invention, not the complete structure.

[0058] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection of the internal structures of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0061] Figure 1 A schematic diagram of the forklift drive wheel assembly provided in this embodiment is shown. Figure 2 A cross-sectional schematic diagram of the forklift drive wheel assembly provided in this embodiment is shown. Figure 3 A schematic diagram of the mounting bracket 1 provided in this embodiment is shown from one viewpoint. Figures 1-3As shown, this embodiment provides a forklift drive wheel assembly, which includes a mounting bracket 1 and a drive wheel 2. The mounting bracket 1 includes a mounting portion 11 and a support portion 12 protruding from one side of the mounting portion 11. A transition slope structure 13 is provided between the mounting portion 11 and the support portion 12, and the thickness of the transition slope structure 13 gradually increases from top to bottom. The drive wheel 2 is rotatably mounted on the side of the support portion 12 that connects to the transition slope structure 13. By adopting a single-sided support structure that mounts the drive wheel 2 on one side of the support portion 12 and providing a transition slope structure 13 between the mounting portion 11 and the support portion 12, stress concentration can be transferred to the hub of the drive wheel 2, and the stress concentration is surface stress. This increases the area and reduces local deformation, thereby ensuring that the mounting bracket 1 remains structurally stable even after long-term use. In addition, the single-sided support structure can also reduce the overall weight of the drive wheel assembly and the thickness along the axial direction of the drive wheel 2 to a certain extent, thereby meeting the requirements of lightweight and compactness.

[0062] The experimental and simulation results show that the maximum stress value of the mounting bracket in the prior art at the stress concentration point is 138.47 MPa, while the maximum stress value of the mounting bracket 1 in this embodiment at the stress concentration point is 50.161 MPa, which is nearly 2 / 3 lower than that of the prior art.

[0063] like Figure 2 and Figure 3 As shown, the support part 12 is provided with a through mounting hole 121, and the drive wheel 2 is rotatably mounted in the mounting hole 121 via the wheel axle 3. The drive wheel 2 includes a hub 21 and a wheel 22. The hub 21 is fitted onto the wheel axle 3 and fixedly mounted thereto, and the wheel 22 is fitted onto the hub 21 and fixedly mounted thereto, so that the drive wheel 2 can rotate synchronously with the wheel axle 3.

[0064] In one optional embodiment, the hub component 21 includes a first hub 211 and a second hub 212. The first hub 211 is fitted onto the axle 3 and extends outward with a first mounting portion 213. The wheel component 22 is fitted onto the outer end face of the second hub 212. The second hub 212 extends towards the first hub 211 with a second mounting portion 214. Both the first mounting portion 213 and the second mounting portion 214 have mounting through holes. During installation, the outer end face of the first mounting portion 213 abuts against the inner sidewall of the second hub 212, and the outer end face of the second mounting portion 214 abuts against the outer sidewall of the first hub 211. The sidewalls of the first mounting portion 213 and the second mounting portion 214 fit together, using mechanical engagement to guide the installation of the wheel component 22 and ensure the concentricity between the wheel component 22 and the axle 3. It is worth noting that the outer end face of the first mounting part 213 and the inner side wall of the second hub 212 adopt a transition fit, while the outer end face of the second mounting part 214 and the outer side wall of the first hub 211 adopt an interference fit. This mechanical fit method of transition first and then interference fit facilitates installation and ensures concentricity after installation. After the side walls of the first mounting part 213 and the second mounting part 214 are abutted together, bolts are sequentially passed through the mounting through holes on the second mounting part 214 and the first mounting part 213 to secure them together.

[0065] The first hub 211 and the second hub 212 are detachably connected. For example, the first hub 211 may have a recessed clearance groove 215 on the side facing the support portion 12, and the clearance groove 215, near the inner wall of the axle 3, is inserted into the mounting hole 121. A sealing ring is filled between the inner wall of the clearance groove 215 and the inner wall of the mounting hole 121. Optionally, the sealing ring may be a lip seal, used to seal the mounting hole 121. It is also worth noting that the inner wall of the clearance groove 215 away from the axle 3 is clearance-fitted with the outer wall of the mounting portion 11, forming a clearance gap to ensure effective rotation of the hub component 21, thereby allowing the wheel component 22 to rotate coaxially with the hub component 21.

[0066] To ensure the stability of the rotation of the axle 3 relative to the mounting hole 121, a bearing 4 is provided between the axle 3 and the mounting hole 121. Two bearings 4 are provided. In this embodiment, the bearing 4 is an angular contact bearing, capable of simultaneously bearing radial and axial loads. A limiting portion 122 is formed by a protrusion on the inner wall of the mounting hole 121. The two bearings 4 are respectively positioned on opposite sides of the limiting portion 122. Notably, the end faces of the two bearings 4 near the limiting portion 122 abut against the side wall of the limiting portion 122. The mechanical limiting of the limiting portion 122 ensures the accuracy of the bearing 4's position after being pressed in.

[0067] Figure 4 A schematic diagram of the mounting bracket 1 provided in this embodiment is shown from another perspective. Figure 5 A cross-sectional view of the mounting bracket 1 provided in this embodiment is shown. Figures 4-5 and combined Figure 2 As shown, the transition slope structure 13 includes a first slope 131 and a second slope 132 connected to each other. The second slope 132 covers the support part 12, and the first slope 131 is located above the second slope 132 and partially covers it. It is worth noting that the outer edge arcs of the first slope 131, the outer edge arcs of the second slope 132, and the connecting arcs of the first slope 131 and the second slope 132 are all offset in their projections onto a plane perpendicular to the wheel axle 3. Through stress simulation experiments, the stress concentration point acts on the transition slope structure 13. After the force acts on the first slope 131 and the second slope 132, due to the non-uniform transition between them, the force path is changed in multiple directions during transmission, thereby optimizing the force transmission path, avoiding significant stress concentration, and ensuring the stability of the structure during long-term use.

[0068] Furthermore, it is worth noting that the centers of the corresponding multiple circles of the first slope 131, the second slope 132, and the projection of the connecting arc of the first slope 131 and the second slope 132 are collinear. In one feasible approach, the line connecting the centers of the multiple circles is located in the vertical direction and is collinear with the diameter of the drive wheel 2, making the first slope 131 and the second slope 132 symmetrically arranged. From the perspective of force distribution, the drive wheel 2 is subjected to uniform force on both sides in the horizontal direction, avoiding the drawbacks such as slight downward collapse on one side affecting the balance of the drive wheel 2.

[0069] In this embodiment, the second slope 132 is approximately frustum-shaped. Notably, the upper outer edge of the second slope 132 tapers slightly inward, with a taper of 5% to 10%. The second slope 132 covers the support portion 12 and provides good support for the bearing 4 in the direction of force (vertical direction). The first slope 131 enhances the support effect of the support portion 12. The combination of the first slope 131 and the second slope 132 can meet the load-bearing requirements of the entire mounting bracket 1.

[0070] Optionally, the projection of the second slope 132 onto the horizontal plane can cover the bearing 4. In other words, the second slope 132 can completely enclose the bearing 4 in the circumferential direction of the mounting hole 121, and the two ends of the second slope 132 in the axial direction of the mounting hole 121 are located on the outer side of the bearing 4. In addition, in the axial direction of the axle 3, the extension distance of the bearing 4 also falls within the extension distance of the second slope 132, so that the second slope 132 can effectively support the bearing 4 at all positions, thereby providing better support force.

[0071] In another alternative embodiment, the projections of the first slope 131 and the second slope 132 onto the horizontal plane can both cover the bearing 4 located on one side. In other words, the first slope 131 and the second slope 132 can completely enclose the bearing 4 in the circumferential direction of the mounting hole 121, and the two ends of the first slope 131 and the second slope 132 are located on the outer side of the bearing 4 at the axial ends of the mounting hole 121, respectively. In addition, in the axial direction of the axle 3, the extension distance of the bearing 4 also falls within the extension distance of the first slope 131 and the second slope 132, so that the first slope 131 and the second slope 132 can work together to effectively support all positions of the bearing 4, thereby providing better support force.

[0072] like Figures 2-4 As shown, the projection of the first slope 131 onto the horizontal plane covers the mounting hole 121. When the wheel axle 3 is installed in the mounting hole 121, the bearing capacity of the support part 12 in the vertical direction is relatively large. With the above-mentioned arrangement, the first slope 131 can play a better auxiliary support role to meet the bearing requirements of the support part 12.

[0073] Optionally, the first slope 131 has an axisymmetric structure, and the thickness of the first slope 131 gradually decreases from the axis of symmetry M towards both ends. The axis of symmetry M of the first slope 131 is parallel to the vertical direction and passes through the center of the mounting hole 121. In other words, the first slope 131 has a waist-drum shape with a bulge in the middle and lower sides. The thickness of the first slope 131 is processed according to the magnitude of stress concentration at different locations to further meet the load-bearing requirements of the support 12. The waist-drum shape increases the strength of the middle part by thickening it to be sufficient to bear the force applied by the vehicle body to the wheel assembly. In addition, the waist-drum shape can also change and optimize the force path, avoid the characteristics of obvious stress concentration, and ensure the stability of the structure during long-term use.

[0074] like Figure 4 As shown, the first slope 131 includes at least two sequentially connected arc surfaces, with rounded corners between adjacent arc surfaces. Since the drive wheel 2 rotates, this design disperses the concentration of force and satisfies the multidirectional nature of the force, ensuring that the support portion 12 always provides effective support to the drive wheel 2 when it rotates.

[0075] Optionally, the first slope 131 includes a first arc surface 1311, a second arc surface 1312, and a third arc surface 1313 arranged sequentially from top to bottom. The two opposite edges of the second arc surface 1312 connect to the first arc surface 1311 and the third arc surface 1313, respectively, with the ends of the two edges of the second arc surface 1312 connected together. This structure also represents a non-uniform transition; the force path is altered in multiple directions when transmitted between the three surfaces, optimizing the force transmission path, avoiding significant stress concentration, and ensuring the stability of the structure during long-term use.

[0076] Optionally, the chamfer between the first slope 131 and the mounting portion 11 is 10° to 20°. For example, the chamfer between the first slope 131 and the mounting portion 11 is 12°, 14°, 15°, 16°, 18°, etc.; the chamfer between the first slope 131 and the second slope 132 is 10° to 20°. For example, the chamfer between the first slope 131 and the second slope 132 is 12°, 14°, 15°, 16°, 18°, etc. It is also worth noting that in the vertical plane, the slope of the first slope 131 is 2.5 to 3.0, the slope of the second slope 132 is 0.50 to 0.55, and the ratio of the lengths of the first slope 131 and the second slope 132 extending in the circumferential direction is 0.25 to 0.30. Preferably, the slope of the first slope 131 is 2.7, which acts as a force buffer bridge. The force applied by the vehicle body to the mounting part 11 is vertically downward, and its path is changed through the first slope 131 and transferred to the second slope 132. With the above-mentioned slope, the force reversal is relatively gentle, which plays a good transition role. Based on the first slope 131, the slope of the second slope 132 is selected as 0.53, and the reversal is more obvious. Combined with the structural design of the second slope 132, it can better receive the force transmitted from the first slope 131. It is also worth noting that the force applied by the vehicle body to the mounting part 11 in the vertical direction is reversed to a force approximately parallel to the axis of the drive wheel 2, so as to avoid the force being applied to the axle 3 as much as possible. Thus, the axle 3 is basically only subjected to the force applied by the drive wheel 2, and the requirements for the dimensions and other parameters of the axle 3 are lower. Preferably, the angle between the force applied vertically downward by the vehicle body to the mounting part 11, which is deflected by the transition slope structure 13 and is approximately parallel to the axis of the drive wheel 2, and the axis of the wheel axle 3 is 10~20°.

[0077] Figure 6 A schematic diagram showing the parameters of the forklift drive wheel assembly provided in this embodiment is shown. For example... Figure 6 and combined Figure 2As shown, through experiments and simulations, the dimensions of the first slope 131 and the second slope 132 are as follows: In this embodiment, the radius R1 of the drive wheel 2 is 70mm, its axial length is 53.5mm, and the thickness L1 of the mounting part 11 is 19mm; the maximum radius R2 of the first slope 131 in the radial direction of the drive wheel 2 is 55.5mm, the minimum radius R3 is 42mm, and the extension length L2 of the first slope 131 in the axial direction of the drive wheel 2 is 5mm; the maximum radius R4 of the second slope 132 in the radial direction of the drive wheel 2 is 42mm, the minimum radius R5 is 32.5mm, and the extension length L3 of the second slope 132 in the axial direction of the drive wheel 2 is 18mm.

[0078] Continue as Figure 3 As shown, in this embodiment, a cantilever portion 14 is integrated on the upper side of the mounting portion 11. The cantilever portion 14 can be integrally injection molded with the mounting portion 11, simplifying the production process and the installation process. The upper end of the cantilever portion 14 is used to support the forklift body. Specifically, a mounting flange is provided on the upper surface of the cantilever portion 14, which effectively securely connects the forklift body. Preferably, the projection of the mounting center point of the mounting flange in the horizontal plane falls within the projection range of the drive wheel 2's axis in the horizontal plane. In the vertical direction, the force on both sides is relatively uniform relative to the wheel, thus ensuring good stability of the drive wheel 2.

[0079] Optionally, the lower end of the cantilever portion 14 is arc-shaped to match the end face shape of the drive wheel 2, and forms a wheel accommodating space 15 between it and the support portion 12. This arrangement is used to accommodate the drive wheel 2, resulting in a more compact structure and providing protection for the drive wheel 2 during use.

[0080] Optionally, a weight-reducing groove 141 is provided on the cantilever portion 14, the weight-reducing groove 141 being recessed in the vertical plane towards the mounting portion 11. This design can reduce the overall weight of the forklift drive wheel assembly to a certain extent. Optionally, multiple weight-reducing grooves 141 can be provided, and the sidewalls of multiple weight-reducing grooves 141 form reinforcing ribs, which can improve the strength of the cantilever portion 14.

[0081] Optionally, the mounting bracket 1 is made of aluminum material, which is lighter than the steel mounting brackets in the prior art, and can further meet the requirements of lightweight forklift drive wheel assembly.

[0082] Figure 7 An exploded view of a portion of the forklift drive wheel assembly provided in this embodiment is shown. Figure 7 and combined Figure 1As shown, the forklift drive wheel assembly also includes a drive mechanism 6. The drive mechanism 6 includes a drive source 61 mounted on the mounting bracket 1 and a gear reduction assembly 62 connected to the output end of the drive source 61. The drive source 61 drives the drive wheel 2 to rotate through the gear reduction assembly 62. By setting the gear reduction assembly 62, the output speed of the drive source 61 can be reduced while the output torque can be increased to ensure the stability of the rotation of the drive wheel 2. Optionally, the drive source 61 is a permanent magnet brushless motor.

[0083] Furthermore, the gear reduction assembly 62 includes at least three sequentially meshing reduction gears, with the center line of the at least three reduction gears forming an angle with the vertical direction. This design can shorten the vertical arrangement distance of the gear reduction assembly 62, making the position of the axle 3 lower, ensuring a lower forklift mounting center, and making its operation more stable.

[0084] In this embodiment, the gear reduction assembly 62 includes three reduction gears: a first-stage reduction gear 621, a second-stage reduction gear 622, and a third-stage reduction gear 623, which mesh sequentially. The first-stage reduction gear 621 is connected to the output end of the drive source 61, and the third-stage reduction gear 623 is connected to the axle 3. When the drive source 61 is working, the driving force can be transmitted to the drive wheel 2 after being reduced in speed sequentially by the first-stage reduction gear 621, the second-stage reduction gear 622, and the third-stage reduction gear 623. Of course, this embodiment does not limit the specific number of reduction gears, and designers can adjust the number of reduction gears according to actual usage requirements.

[0085] Figure 8 A schematic diagram of the concealed mounting bracket 1 for the forklift drive wheel assembly provided in this embodiment is shown. Figure 8 and combined Figure 1 As shown, the drive mechanism 6 also includes a planetary gear assembly 63. The output end of the drive source 61 is connected to the input end of the gear reduction assembly 62 through the planetary gear assembly 63, and the drive wheel 2 is connected to the output end of the gear reduction assembly 62. The combination of the planetary gear assembly 63 and the gear reduction assembly 62 replaces the ordinary gear reduction mechanism in the prior art. While maintaining a small size, it can also achieve a better reduction ratio. Furthermore, it can increase the reduction ratio to approximately 69 while keeping the speed of the drive wheel 2 constant, equivalent to 2-3 times that of the prior art. This allows the gear reduction assembly 62 to be adapted to the drive source 61, which has low torque, large capacity, and small size. Compared to traditional drive sources, the drive source 61 in this embodiment is 20%-30% smaller in size, meeting the compact and miniaturized structural requirements of forklifts. It should be noted that the input end of the gear reduction assembly 62 is the first-stage reduction gear 621, and the output end of the gear reduction assembly 62 is the third-stage reduction gear 623.

[0086] Optionally, the drive source 61 is located on the first side 101 of the mounting bracket 1, the drive wheel 2 is located on the first side 101 of the mounting bracket 1 and offset from the drive source 61, and the gear reduction assembly 62 is located on the second side 102 of the mounting bracket 1. This arrangement, combined with the arrangement where the center line of at least three reduction gears forms an angle with the vertical direction, can further lower the mounting center of the forklift and improve the overall structural stability of the forklift.

[0087] Figure 9 A schematic diagram of the structure of the driver source 61 provided in this embodiment is shown. Figure 10 An exploded view of the planetary gear assembly 63 provided in this embodiment is shown. Figures 9-10 and combined Figure 8 As shown, the planetary gear assembly 63 includes a ring gear 631, a sun gear 632, planetary gears 633, and a gear carrier 634. The ring gear 631 is mounted on the mounting bracket 1 and has an annular structure. The inner ring wall of the ring gear 631 has internal teeth 6311 spaced circumferentially on its inner ring wall. The sun gear 632 is connected to the output end of the drive source 61 and is located in the middle of the ring gear 631. Notably, the rotation axis of the drive source 61 is collinear with the rotation axis of the sun gear 632, and the output shaft of the drive source 61 is parallel to the sun gear 632. The gear carrier 634 is equipped with pivot holes 6341 corresponding to the planetary gears 632. Each planetary gear 633 is pivotally connected to the pivot hole 6341, which in turn drives the gear carrier 634 to rotate around the rotation axis of the sun gear 632. The gear carrier 634 is connected to the input end of the gear reduction assembly 62. When the drive source 61 is working, it can drive the sun gear 632 to rotate. The sun gear 632 can drive the multiple planetary gears 633 that mesh with it to move around the circumference of the gear ring 631, thereby driving the gear carrier 634 to rotate, and thus realizing the rotation of the input end of the gear reduction assembly 62.

[0088] Optionally, there are at least two planetary gear assemblies 63, and the at least two planetary gear assemblies 63 are connected in series to further improve the reduction ratio. In this embodiment, there are two planetary gear assemblies 63. It has been verified that in the prior art, when the drive source drives the drive wheel to rotate only through the gear reduction assembly, its reduction ratio is 22~30; while in this embodiment, when the drive source 61 drives the drive wheel 2 to rotate through two planetary gear assemblies 63 and one gear reduction assembly 62, its reduction ratio is approximately 69. Of course, in other embodiments, the number of planetary gear assemblies 63 can be any number of one, three, or more, and this embodiment does not limit this. It should be noted that when the number of planetary gear assemblies 63 is greater than or equal to two, the sun gear 632 of the lower-level planetary gear assembly 63 is interference-fitted onto the gear carrier 634 of the upper-level planetary gear assembly 63.

[0089] When there is only one planetary gear assembly 63, the sun gear 632 of the planetary gear assembly 63 is integrally formed with the output end of the drive source 61. When there are two or more planetary gear assemblies 63, the sun gear 632 of one of the two planetary gear assemblies 63 located near the drive source 61 is integrally formed with the output end of the drive source 61, while the gear carrier 634 of the other is connected to the input end of the gear reduction assembly 62. This design can improve installation efficiency while ensuring the concentricity of the drive source 61 and the planetary gear assembly 63. Specifically, the output end of the drive source 61 and the corresponding sun gear 632 are integrally formed by cold forging or by molding.

[0090] In this embodiment, the drive source 61 is a permanent magnet brushless motor, and the magnets of the permanent magnet brushless motor are made of ferrite material. Ferrite material has the advantages of low price, simple manufacturing process, high coercivity, and strong anti-demagnetization ability. Based on the above structure, it can meet the selection of planetary gear assembly 63.

[0091] Continue as Figure 7 As shown, the mounting bracket 1 also includes a side cover 16. The mounting portion 11 is provided with a receiving cavity 111 for accommodating the gear reduction assembly 62 and the planetary gear assembly 63. The side cover 16 can seal the opening of the receiving cavity 111. The side cover 16 can protect the gear reduction assembly 62 and prevent it from being affected by dust and rust due to prolonged exposure to the outside, which would affect its normal working performance. The above-mentioned integration of the receiving cavities 111 of the gear reduction assembly 62 and the planetary gear assembly 63 into the mounting portion 11, with its one-piece molding, can improve production efficiency and avoid the disadvantages of large errors caused by cumbersome installation procedures. Especially for transmission structures, large errors will inevitably cause vibration, noise, and unstable operation.

[0092] Optionally, the side cover 16 is detachably connected to the mounting portion 11. When the gear reduction assembly 62 malfunctions and requires maintenance, the operator can easily remove the side cover 16 to repair or replace the gear reduction assembly 62. In this embodiment, the side cover 16 is bolted to the mounting portion 11, which has the advantages of stable connection and convenient assembly / disassembly. Of course, in other embodiments, the side cover 16 can also be connected to the mounting portion 11 by snap-fit, plug-in, riveting, etc., and this embodiment does not limit this.

[0093] The gear reduction assembly 62 generates a large amount of heat during operation. If this heat cannot be dissipated in time, it will affect the performance of the gear reduction assembly 62. In this embodiment, a coolant is sealed in the accommodating cavity 111 to cool the gear reduction assembly 62 and dissipate the heat generated during operation, thereby ensuring the performance of the gear reduction assembly 62.

[0094] It is understandable that while the coolant cools the gear reduction assembly 62, its own temperature rises, causing the air pressure in the accommodating cavity 111 to increase. When the air pressure exceeds a preset value, the coolant will leak from the seal between the side cover 16 and the mounting part 11. To solve this problem, in this embodiment, a pressure relief valve 17 is also provided on the mounting part 11. The pressure relief valve 17 is located above the level of the coolant stored in the accommodating cavity 111 and is used to connect the accommodating cavity 111 to the outside. By providing the pressure relief valve 17, when the air pressure in the accommodating cavity 111 is too high, the pressure relief valve 17 can be opened to connect the accommodating cavity 111 to the outside, thereby maintaining a stable air pressure in the accommodating cavity 111 and preventing coolant leakage due to excessive temperature.

[0095] like Figure 7 and combined Figure 2 As shown, in this embodiment, a connecting flange 5 is connected to the side of the drive wheel 2 near the support part 12. The connecting flange 5 and the wheel axle 3 are integrally formed to ensure that the drive wheel 2 and the gear reduction assembly 62 have a high degree of concentricity. Specifically, the connecting flange 5 and the wheel axle 3 are integrally formed by cold heading process, and the other mounting surfaces on the connecting flange 5 are completed by turning process after the cold heading process.

[0096] Optionally, the drive wheel 2 is connected to the connecting flange 5 by screws, which provides a secure connection and facilitates easy assembly and disassembly.

[0097] This embodiment also provides a forklift, which includes a forklift body and the aforementioned forklift drive wheel assembly, the forklift drive wheel assembly being mounted on the forklift body. By applying the aforementioned forklift drive wheel assembly, the overall weight of the drive wheel assembly and its thickness along the axial direction of the drive wheel 2 can be reduced while ensuring stable installation, thereby meeting the requirements of lightweight and compact design.

[0098] Note that the above description illustrates and describes the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of the claimed utility model, which is defined by the appended claims and their equivalents.

Claims

1. A forklift drive wheel assembly, comprising: include: The mounting bracket (1) includes a mounting part (11) and a support part (12) protruding from one side of the mounting part (11). A transition slope structure (13) is provided between the mounting part (11) and the support part (12). The thickness of the transition slope structure (13) gradually increases from top to bottom. The drive wheel (2) is rotatably mounted on the side of the support (12) that connects to the transition slope structure (13); The transition slope structure (13) includes a first slope (131) and at least one second slope (132). The first slope (131) and the second slope (132) are connected. The outer edge arc of the first slope (131), the outer edge arc of the second slope (132), and the connecting arc of the first slope (131) and the second slope (132) are respectively offset in the center of the circle corresponding to the projection in the plane perpendicular to the axis of the drive wheel (2).

2. The forklift drive wheel assembly according to claim 1, characterized in that, The first slope (131), the second slope (132), and the corresponding multiple circles of the docking arc projection of the first slope (131) and the second slope (132) are arranged collinearly; The second slope (132) covers the support (12), and the first slope (131) is located above the second slope (132) and partially covers the second slope (132); The first slope (131) includes at least two arc surfaces connected in sequence, with rounded corners between adjacent arc surfaces; The first slope (131) includes a first arc surface (1311), a second arc surface (1312) and a third arc surface (1313) arranged sequentially from top to bottom. The two opposite edges of the second arc surface (1312) are respectively connected to the first arc surface (1311) and the third arc surface (1313), and the ends of the two edges of the second arc surface (1312) are connected together.

3. The forklift drive wheel assembly according to claim 1, characterized in that, The chamfer between the first slope (131) and the mounting part (11) is 10°~20°; and / or The chamfer between the first slope (131) and the second slope (132) is 10°~20°; and / or The slope of the first slope (131) in the vertical plane is 2.5~3.0, the slope of the second slope (132) is 0.50~0.55, and the ratio of the lengths of the first slope (131) and the second slope (132) in the circumferential direction is 0.25~0.

30.

4. The forklift drive wheel assembly according to claim 1, characterized in that, The support part (12) is provided with a through mounting hole (121), and the drive wheel (2) is rotatably mounted in the mounting hole (121) via the wheel axle (3). At least one bearing (4) is provided between the axle (3) and the mounting hole (121), and the projection of the second slope (132) on the horizontal plane can cover at least one of the bearings (4). The inner wall of the mounting hole (121) has a protrusion forming a limiting part (122). There are two bearings (4). The two bearings (4) are located on opposite sides of the limiting part (122). The end faces of the two bearings (4) near the limiting part (122) respectively abut against the side wall of the limiting part (122).

5. The forklift drive wheel assembly according to claim 4, characterized in that, The projection of the first slope (131) onto the horizontal plane covers the mounting hole (121). The first slope (131) is an axisymmetric structure, and the thickness of the first slope (131) gradually decreases from the axis of symmetry M to both ends. The axis of symmetry M of the first slope (131) is parallel to the vertical direction and passes through the center of the mounting hole (121).

6. The forklift drive wheel assembly according to claim 4, characterized in that, The drive wheel (2) includes a hub (21) and a wheel (22). The hub (21) is mounted on the axle (3) and fixedly connected to the axle (3). The wheel (22) is mounted on the hub (21) and fixedly connected to the hub (21). The drive wheel (2) rotates with the axle (3). The axes of the two are collinear and rotate synchronously. The hub component (21) includes a first hub (211) and a second hub (212). The first hub (211) is fitted on the axle (3) and extends outward to form a first mounting portion (213). The wheel component (22) is fitted on the outer end face of the second hub (212). The second hub (212) extends towards the first hub (211) to form a second mounting portion (214). The outer end face of the first mounting portion (213) abuts against the inner sidewall of the second hub (212), and the outer end face of the second mounting portion (214) abuts against the outer sidewall of the first hub (211). The sidewalls of the first mounting portion (213) and the second mounting portion (214) fit together and are fixedly connected by a locking member. The first hub (211) has a recessed relief groove (215) on the side facing the support (12). The relief groove (215) is inserted into the mounting hole (121) near the inner wall of the axle (3), and a seal is filled between the relief groove (215) and the mounting hole (121). A relief gap is formed between the inner wall of the relief groove (215) away from the axle (3) and the support (12).

7. The forklift drive wheel assembly according to claim 1, characterized in that, The mounting part (11) has a cantilever part (14) integrated on the side away from the support part (12). The upper end of the cantilever part (14) is used to support the body of the forklift, and the projection of the center point of the support point in the horizontal plane falls on the projection of the axis of the drive wheel (2) in the horizontal plane. The lower end of the cantilever (14) is adapted to the end face shape of the drive wheel (2) and forms a wheel accommodating space (15) between it and the support (12). The cantilever (14) is provided with a weight reduction groove (141), which is recessed in the vertical plane toward the mounting part (11).

8. The forklift drive wheel assembly according to claim 1, characterized in that, The forklift drive wheel assembly also includes a drive mechanism (6), which includes a drive source (61) mounted on the mounting bracket (1) and a gear reduction assembly (62) connected to the output end of the drive source (61). The drive source (61) drives the drive wheel (2) to rotate through the gear reduction assembly (62). The gear reduction assembly (62) includes at least three sequentially meshing reduction gears, and the center line connecting the at least three reduction gears is set at an angle to the vertical direction; The mounting bracket (1) also includes a side cover (16), and the mounting part (11) is provided with a receiving cavity (111) for accommodating the gear reduction assembly (62), and the side cover (16) can cover the opening of the receiving cavity (111); The mounting part (11) is also provided with a pressure relief valve (17), which is located above the liquid stored in the accommodating cavity (111) and is used to connect the accommodating cavity (111) to the outside.

9. The forklift drive wheel assembly according to any one of claims 1-8, characterized in that, The mounting bracket (1) is made of aluminum.

10. A forklift, characterized in that, It includes a forklift body and a forklift drive wheel assembly as described in any one of claims 1-9, wherein the forklift drive wheel assembly is disposed on the forklift body.

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