Forklift driving wheel assembly and forklift

Abstract

The invention relates to the technical field of vehicles, in particular to a forklift driving wheel assembly and a forklift. The forklift driving wheel assembly comprises a mounting support and a driving wheel, the mounting support comprises a mounting part and a supporting part arranged on one side of the mounting part in a protruding mode, a transition slope surface structure is arranged between the mounting 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] The present invention relates to the technical field of vehicles, and in particular to a forklift drive wheel assembly and a forklift. Background Art

[0002] A forklift is an industrial handling vehicle, referring to various wheeled handling vehicles for loading, unloading, stacking, and short-distance transportation of palletized goods. It plays a very important role in the enterprise's logistics system and is the main force in material handling equipment. Among them, the electric forklift driven by an electric motor is gradually replacing the internal combustion forklift and the manual forklift due to its advantages of no pollution, low noise, and flexibility.

[0003] The drive wheel assembly of an electric forklift is an important component in the forklift. It generally includes a drive bracket, a drive motor installed on the drive bracket, and a drive wheel. A wheel groove is formed at the bottom of the drive bracket. The drive wheel is located in the wheel groove, and both ends of the drive wheel are rotatably arranged on two opposite groove walls of the wheel groove through bearings. Installing the drive wheel in this bilateral support manner can ensure the stability of the drive wheel installation. However, this structure will cause the drive wheel assembly to be relatively heavy and have a relatively large thickness in the axial direction of the drive wheel, resulting in a relatively large space required for the drive wheel to turn, which 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 technical problems. Summary of the Invention

[0005] The object of the present invention is to propose a forklift drive wheel assembly and a forklift, which can reduce the overall weight of the drive wheel assembly and the thickness in the axial direction of the drive wheel while ensuring the stable installation of the drive wheel, so as to meet the requirements of lightweight and compactness.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A forklift drive wheel assembly includes:

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

[0009] A drive wheel, rotatably arranged on the side of the support portion connected to the transition slope structure;

[0010] A drive mechanism, arranged on the mounting portion, and the drive mechanism is configured to drive the drive wheel to rotate;

[0011] The transition slope structure includes a first slope and at least one second slope. The first slope and the second slope are connected. The centers of the arcs corresponding to the outer edge arcs of the first slope, the outer edge arcs of the second slope, and the docking arc between the first slope and the second slope are respectively offset in the plane perpendicular to the axis of the driving wheel.

[0012] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the centers of the corresponding projections of the first slope, the second slope, and the docking arc between the first slope and the second slope are collinear.

[0013] As a preferred solution of the forklift driving wheel assembly provided by the present invention, 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.

[0014] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the first slope includes at least two arc surfaces connected in sequence, and a fillet transition is adopted between adjacent two arc surfaces.

[0015] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the first slope includes a first arc surface, a second arc surface, and a third arc surface arranged in sequence 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.

[0016] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the chamfer between the first slope and the mounting portion is 10° to 20°; and / or

[0017] The chamfer between the first slope and the second slope is 10° to 20°.

[0018] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the slope of the first slope in the vertical plane is 2.5 to 3.0, the slope of the second slope is 0.50 to 0.55, and the ratio of the circumferential extension lengths of the first slope and the second slope is 0.25 to 0.30.

[0019] As a preferred solution of the forklift driving wheel assembly provided by the present invention, a through mounting hole is provided on the support portion, and the driving wheel is rotatably arranged in the mounting hole through a wheel shaft.

[0020] As a preferred solution of the forklift driving wheel assembly provided by the present invention, at least one bearing is provided between the wheel shaft and the mounting hole, and the projection of the second slope in the horizontal plane can cover at least one of the bearings.

[0021] As a preferred solution of the forklift driving wheel assembly provided by the present invention, a limiting portion is formed by a protrusion on the inner side wall of the mounting hole, and two bearings are provided. The two bearings are arranged on opposite sides of the limiting portion, and the end faces of the two bearings close to the limiting portion are respectively abutted against the side walls of the limiting portion.

[0022] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the projection of the first slope surface on the horizontal plane covers the mounting hole.

[0023] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the first slope surface is an axisymmetric structure, and the thickness of the first slope surface gradually decreases from the symmetry axis M to both ends, and the symmetry axis M of the first slope surface is parallel to the vertical direction and passes through the center of the mounting hole.

[0024] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the driving wheel includes a hub component and a wheel component, the hub component is sleeved on the wheel axle and fixedly arranged with the wheel axle, the wheel component is sleeved on the hub component and fixedly connected with the hub component, and the driving wheel rotates with the wheel axle, and the axes of the two are colinear and rotate synchronously.

[0025] As a preferred solution of the forklift driving wheel assembly provided by the present invention, the wheel hub component includes a first wheel hub and a second wheel hub, the first wheel hub is sleeved on the wheel axle and extends a first mounting portion outwardly, the wheel component is sleeved on the outer end surface of the second wheel hub, the second wheel hub extends a second mounting portion toward the first wheel hub, the outer end surface of the first mounting portion abuts against the inner side wall of the second wheel hub, the outer end surface of the second mounting portion abuts against the outer side wall of the first wheel hub, and the side walls of the first mounting portion and the second mounting portion are fitted and abutted and fixedly connected by a locking member.

[0026] As a preferred solution of the forklift driving wheel assembly provided by the present invention, a side of the first wheel hub facing the support portion is recessed to form an avoidance groove, the avoidance groove is inserted into the mounting hole close to the inner side wall of the wheel axle, and a seal is filled between the gap with the mounting hole, and an avoidance gap is formed between the avoidance groove away from the inner side wall of the wheel axle and the support portion.

[0027] As a preferred solution of the forklift driving wheel assembly provided by the present invention, a cantilever portion is integrated on the side of the mounting portion facing away from the supporting portion, and the upper end of the cantilever portion is used to support the body of the forklift, and the projection of the center point of the supporting portion in the horizontal plane falls on the projection of the axis of the driving wheel in the horizontal plane.

[0028] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, the lower end of the cantilever portion is adapted to the end face shape of the driving wheel, and a wheel accommodating space is formed between the cantilever portion and the supporting portion.

[0029] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, a weight reduction groove is provided on the cantilever portion, and the weight reduction groove is recessed toward the mounting portion side in the vertical plane.

[0030] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, the driving mechanism includes a driving source provided on the mounting bracket and a gear reduction assembly connected to the output end of the driving source, and the driving source drives the driving wheel to rotate through the gear reduction assembly.

[0031] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, the gear reduction assembly includes at least three sequentially meshing reduction gears, and the center connection lines of at least three of the reduction gears are arranged at an angle to the vertical direction.

[0032] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, the mounting bracket further includes a side cover, a receiving cavity for receiving the gear reduction assembly is provided on the mounting portion, and the side cover can cover the opening of the receiving cavity.

[0033] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, a pressure relief valve is further provided on the mounting portion, the pressure relief valve is located above the liquid stored in the receiving cavity, and the pressure relief valve is used to communicate the receiving cavity with the outside.

[0034] As a preferred embodiment of the forklift driving wheel assembly provided by the present invention, the mounting bracket is made of an aluminum material.

[0035] The present invention further provides a forklift, including a forklift body and the forklift driving wheel assembly as described above, and the forklift driving wheel assembly is provided on the forklift body.

[0036] The beneficial effects of the present invention are:

[0037] The forklift drive wheel assembly provided by the present invention adopts a single-sided support structure with the drive wheel arranged on one side of the support part, and a transition slope structure is provided between the installation part and the support part. This can transfer stress concentration to the hub of the drive wheel, and the stress concentration is surface stress, reducing the local deformation amount by increasing the area, thereby ensuring that the installation bracket remains structurally stable 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 in the axial direction of the drive wheel to a certain extent, thus meeting the requirements of light weight and compactness. By arranging the outer edge arcs of the first slope, the outer edge arcs of the second slope, and the center points corresponding to the projections of the docking arc between the first slope and the second slope in the plane perpendicular to the wheel axle to be misaligned, the stress concentration point can act on the transition slope structure. After the force acts on the first slope and the second slope, due to the non-uniform transition between the first slope and the second slope, the path of the force will be changed in multiple directions during transmission between the two, thereby optimizing the force transmission path and avoiding the obviousness of stress concentration, ensuring the structural stability during long-term use.

[0038] The forklift provided by the present invention, by applying the above-mentioned forklift drive wheel assembly, can reduce the overall weight of the drive wheel assembly and the thickness in the axial direction of the drive wheel while ensuring the stable installation of the drive wheel, thereby meeting the requirements of light weight and compactness. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present invention and these drawings.

[0040] Figure 1 is a schematic structural diagram of the forklift drive wheel assembly provided by the embodiment of the present invention;

[0041] Figure 2 is a schematic cross-sectional view of the forklift drive wheel assembly provided by the embodiment of the present invention;

[0042] Figure 3 is a schematic structural diagram of the installation bracket provided by the embodiment of the present invention from one perspective;

[0043] Figure 4 is a schematic structural diagram of the installation bracket provided by the embodiment of the present invention from another perspective;

[0044] Figure 5 is a schematic cross-sectional view of the installation bracket provided by the embodiment of the present invention;

[0045] Figure 6 It is a schematic diagram of various parameters of the forklift driving wheel assembly provided by an embodiment of the present invention;

[0046] Figure 7 It is a partial explosion schematic diagram of the forklift driving wheel assembly provided by an embodiment of the present invention;

[0047] Figure 8 It is a schematic diagram of the structure of the hidden mounting bracket of the forklift driving wheel assembly provided by an embodiment of the present invention;

[0048] Figure 9 It is a schematic diagram of the structure of the drive source provided by an embodiment of the present invention;

[0049] Figure 10 It is an explosion schematic diagram of the planetary gear assembly provided by an embodiment of the present invention.

[0050] The markings in the figure are as follows:

[0051] 1 - mounting bracket; 11 - mounting part; 111 - accommodating cavity; 101 - first side; 102 - second side;

[0052] 12 - supporting part; 121 - mounting hole; 122 - limiting part;

[0053] 13 - transition slope structure; 131 - first slope; 1311 - first arc surface; 1312 - second arc surface; 1313 - third arc surface; 132 - second slope;

[0054] 14 - cantilever part; 141 - weight - reducing groove; 15 - wheel accommodating space; 16 - side cover; 17 - pressure - relief valve;

[0055] 2 - driving wheel; 21 - hub part; 211 - first hub; 212 - second hub; 213 - first mounting part; 214 - second mounting part; 215 - avoidance groove; 22 - wheel part;

[0056] 3 - wheel axle; 4 - bearing; 5 - connecting flange;

[0057] 6 - driving 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 - ring gear; 6311 - internal teeth; 632 - sun gear; 633 - planetary gear; 634 - gear carrier; 6341 - pivot hole. Detailed implementation manners

[0058] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the structural parts related to the present invention are shown in the drawings instead of the entire structure.

[0059] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication of the internal structures of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the", and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is less than that of the second feature.

[0061] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0062] Figure 1 The structural schematic diagram of the forklift drive wheel assembly provided in this embodiment is shown. Figure 2 The cross-sectional schematic diagram of the forklift drive wheel assembly provided in this embodiment is shown. Figure 3 The structural schematic diagram of the mounting bracket 1 provided in this embodiment from a perspective is shown. As Figures 1-3As shown in the figure, this embodiment provides a forklift driving wheel assembly. The forklift driving wheel assembly includes a mounting bracket 1 and a driving wheel 2. The mounting bracket 1 includes a mounting portion 11 and a supporting 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 supporting portion 12, and the thickness of the transition slope structure 13 gradually increases from top to bottom. The driving wheel 2 is rotatably arranged on the side of the supporting portion 12 connected to the transition slope structure 13. By adopting a single-sided support structure with the driving wheel 2 arranged on one side of the supporting portion 12 and providing a transition slope structure 13 between the mounting portion 11 and the supporting portion 12, the stress concentration can be transferred to the hub of the driving wheel 2, and the stress concentration is surface stress, reducing the local deformation amount by increasing the area, so as to ensure that the mounting bracket 1 remains structurally stable after long-term use. In addition, the single-sided support structure can also reduce the overall weight of the driving wheel assembly and the thickness in the axial direction of the driving wheel 2 to a certain extent, thus meeting the requirements of lightweight and compactness.

[0063] It can be seen from the experimental and simulation results that the maximum stress value received by the mounting bracket in the prior art at the stress concentration point is 138.47 MPa, while the maximum stress value received by the mounting bracket 1 in this embodiment at the stress concentration point is 50.161 MPa, which is reduced by nearly 2 / 3 compared with the prior art.

[0064] As Figure 2 and Figure 3 shown in the figure, a through mounting hole 121 is provided on the supporting portion 12, and the driving wheel 2 is rotatably arranged in the mounting hole 121 through a wheel shaft 3. The driving wheel 2 includes a hub member 21 and a wheel member 22. The hub member 21 is sleeved on the wheel shaft 3 and fixedly arranged with the wheel shaft 3, and the wheel member 22 is sleeved on the hub member 21 and fixedly arranged with the hub member 21. Thus, the driving wheel 2 can rotate synchronously with the wheel shaft 3.

[0065] Optionally, in one embodiment, the hub member 21 includes a first hub 211 and a second hub 212. The first hub 211 is sleeved on the axle 3 and extends outward to form a first mounting portion 213. The wheel member 22 is sleeved on the outer end face of the second hub 212. The second hub 212 extends toward the first hub 211 to form a second mounting portion 214. Mounting through holes are provided on both the first mounting portion 213 and the second mounting portion 214. During the installation process, the outer end face of the first mounting portion 213 abuts against the inner side wall of the second hub 212, the outer end face of the second mounting portion 214 abuts against the outer side wall of the first hub 211, and the side walls of the first mounting portion 213 and the second mounting portion 214 are in abutting contact. By means of mechanical cooperation, it plays a guiding role in the installation of the wheel member 22 to ensure the concentricity between the wheel member 22 and the axle 3. It should be noted that an interference fit is adopted between the outer end face of the first mounting portion 213 and the inner side wall of the second hub 212, and an interference fit is adopted between the outer end face of the second mounting portion 214 and the outer side wall of the first hub 211. The mechanical cooperation method of first interference and then interference is convenient for installation and can also ensure the concentricity after installation. Among them, after the side walls of the first mounting portion 213 and the second mounting portion 214 are in abutting contact, the two are fixed by bolts passing through the mounting through holes on the second mounting portion 214 and the first mounting portion 213 in sequence.

[0066] The above-mentioned first hub 211 and second hub 212 are detachably connected. Exemplarily, a relief groove 215 may be formed by recessing the side of the first hub 211 facing the support portion 12, and the inner side wall of the relief groove 215 close to the axle 3 is inserted into the mounting hole 121. Among them, a sealing ring is filled between the inner side wall of the relief groove 215 and the inner wall of the mounting hole 121. Optionally, the sealing ring may be a lip seal, which is used to seal the mounting hole 121. It should also be noted that the inner side wall of the relief groove 215 away from the axle 3 has a clearance fit with the outer side wall of the mounting portion 11 to form a relief gap to ensure the effective rotation of the hub member 21, and further enable the wheel member 22 to rotate coaxially with the hub member 21.

[0067] 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. The number of the bearings 4 is two. In this embodiment, the bearing 4 is an angular contact bearing, which can bear both radial load and axial load at the same time. A limiting portion 122 is formed by protruding on the inner side wall of the mounting hole 121, and the two bearings 4 are respectively arranged on opposite sides of the limiting portion 122. It should be noted that the end faces of the two bearings 4 close to the limiting portion 122 are respectively in abutting contact with the side wall of the limiting portion 122, and the mechanical limit of the limiting portion 122 ensures the accuracy of the position of the bearing 4 after being pressed in.

[0068] Figure 4 Fig. shows a schematic structural view of the mounting bracket 1 provided in this embodiment from another perspective.Figure 5 The cross-sectional schematic view of the mounting bracket 1 provided in this embodiment is shown. As Figures 4-5 and in combination with Figure 2 shown, the transition slope structure 13 includes a connected first slope 131 and a second slope 132. The second slope 132 is wrapped outside the support portion 12. The first slope 131 is located above the second slope 132 and partially wraps outside the second slope 132. It should be noted that the center points corresponding to the projections of the outer edge arc of the first slope 131, the outer edge arc of the second slope 132, and the butt joint arc between the first slope 131 and the second slope 132 in the plane perpendicular to the wheel axle 3 are arranged in a staggered manner. Through the force simulation experiment, the force 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 the first slope 131 and the second slope 132, the path of the force will be changed in multiple directions during the transmission between the two, thereby optimizing the force transmission path and avoiding the obvious stress concentration, ensuring the stability of the structure during long-term use.

[0069] In addition, it should also be noted that the multiple center points corresponding to the projections of the first slope 131, the second slope 132, and the butt joint arc between the first slope 131 and the second slope 132 are arranged collinearly. In one feasible way, the connection line of the multiple center points is in the vertical direction and collinear with the diameter of the driving wheel 2, so that the first slope 131 and the second slope 132 are symmetrically arranged. From the perspective of force, the forces on both sides of the driving wheel 2 in the horizontal direction are uniform, avoiding disadvantages such as the slight collapse on one side affecting the balance of the driving wheel 2.

[0070] In this embodiment, the second slope 132 is approximately frustum-shaped. It should be noted that the outer edge at the upper part of the second slope 132 shrinks slightly inward, and the shrinkage amount is 5% - 10%. The second slope 132 is wrapped outside the support portion 12, which can play a better supporting role for the bearing 4 in the force direction (up and down). The first slope 131 can enhance the supporting effect of the support portion 12. The cooperation between the first slope 131 and the second slope 132 can meet the load-bearing requirements of the entire mounting bracket 1.

[0071] Optionally, the projection of the second slope 132 on the horizontal plane can cover the bearing 4. In other words, the second slope 132 can completely wrap the bearing 4 in the circumferential direction of the mounting hole 121, and both ends of the second slope 132 in the axial direction of the mounting hole 121 are located outside the bearing 4. Additionally, in the axial direction of the wheel axle 3, the extended distance of the bearing 4 also falls within the extended distance of the second slope 132, so that the second slope 132 can play an effective supporting role for each position of the bearing 4, thereby providing better supporting force.

[0072] In another alternative embodiment, the projections of the first slope surface 131 and the second slope surface 132 on the horizontal plane can both cover the bearing 4 on one side thereof. In other words, the first slope surface 131 and the second slope surface 132 can entirely wrap the bearing 4 in the circumferential direction of the mounting hole 121, and the two ends of the first slope surface 131 and the second slope surface 132 in the axial direction of the mounting hole 121 are respectively located outside the bearing 4. Additionally, in the axial direction of the axle 3, the extending distance of the bearing 4 also falls within the extending distances of the first slope surface 131 and the second slope surface 132, so that the first slope surface 131 and the second slope surface 132 can jointly provide effective support for all positions of the bearing 4, thereby providing better supporting force.

[0073] As Figures 2-4 shown, the projection of the first slope surface 131 on the horizontal plane covers the mounting hole 121. When the axle 3 is installed in the mounting hole 121, the bearing capacity of the supporting portion 12 in the vertical direction is relatively large. With the above setting method, the first slope surface 131 can play a better auxiliary supporting role to meet the bearing requirements of the supporting portion 12.

[0074] Optionally, the first slope surface 131 is an axisymmetric structure, and the thickness of the first slope surface 131 gradually decreases from the symmetry axis M to both ends. The symmetry axis M of the first slope surface 131 is parallel to the vertical direction and passes through the center of the mounting hole 121. In other words, the first slope surface 131 has a waist drum shape with a bulge in the middle and low on both sides. The thickness of the first slope surface 131 is processed according to the magnitude of the stress concentration at different positions to further meet the bearing requirements of the supporting portion 12. The setting method of the waist drum shape improves the strength of the middle part by thickening it to sufficiently bear the force exerted by the vehicle body on the wheel assembly. Additionally, the setting method of the waist drum shape can also change the force path and optimize it, avoiding the obviousness of stress concentration and ensuring the structural stability during long-term use.

[0075] As Figure 4 shown, the first slope surface 131 includes at least two arc surfaces connected in sequence, and a fillet transition is adopted between adjacent two arc surfaces. Since the driving wheel 2 has a rotating motion, this design can disperse the concentration of force and meet the multi-directionality of force, so that the supporting portion 12 can always effectively support the driving wheel 2 when the driving wheel 2 rotates.

[0076] Optionally, the first slope 131 includes a first curved surface 1311, a second curved surface 1312 and a third curved surface 1313 arranged in sequence from top to bottom, and two opposite edges of the second curved surface 1312 are respectively connected to the first curved surface 1311 and the third curved surface 1313, wherein the ends of the two edges of the second curved surface 1312 are connected together. The above structure also belongs to a non-uniform transition, and the path of force will be changed in multiple directions when it is transmitted between the three, which optimizes the force transmission path, avoids the obvious characteristics of stress concentration, and ensures the stability of the structure during long-term use.

[0077] Optionally, the chamfer between the first slope 131 and the mounting portion 11 is 10° to 20°, and illustratively, 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°, and illustratively, 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 length of the first slope 131 to 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 is used to act as a buffer bridge for force. The force applied by the vehicle body on the mounting portion 11 is directed vertically downward, changes its path through the first slope 131 and is transferred to the second slope 132. The above slope is adopted, and the redirection of the force is relatively gentle, which plays a good transitional role. On the basis of the first slope 131, the slope of the second slope 132 is selected as 0.53, and the redirection is more obvious. Combined with the structural setting of the second slope 132, it is more capable of receiving the force transmitted from the first slope 131. It is also worth noting that the force applied by the vehicle body on the mounting portion 11 in the vertical direction is redirected to a force approximately parallel to the axis of the driving wheel 2, so as to avoid the force applied to the axle 3 as much as possible, so that the axle 3 is basically only subjected to the force applied by the driving wheel 2, and the requirements for the size and other parameters of the axle 3 are lower. Preferably, the vertically downward force applied by the vehicle body to the mounting portion 11 is redirected by the transition slope structure 13 to form a force approximately parallel to the axis of the driving wheel 2 , and the angle between the force and the axis of the axle 3 is 10 to 20°.

[0078] Figure 6 FIG. 2 shows a schematic diagram of various parameters of the forklift driving wheel assembly provided in this embodiment. Figure 6 Combined with Figure 2As shown, through experimental and simulation verification, the parameter dimensions of the first slope 131 and the second slope 132 are as follows: In this embodiment, the radius R1 of the driving wheel 2 is 70 mm, its axial length is 53.5 mm, and the thickness L1 of the mounting portion 11 is 19 mm; the maximum radius R2 of the first slope 131 in the radial direction of the driving wheel 2 is 55.5 mm, the minimum radius R3 is 42 mm, and the extension length L2 of the first slope 131 in the axial direction of the driving wheel 2 is 5 mm; the maximum radius R4 of the second slope 132 in the radial direction of the driving wheel 2 is 42 mm, the minimum radius R5 is 32.5 mm, and the extension length L3 of the second slope 132 in the axial direction of the driving wheel 2 is 18 mm.

[0079] 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, with simple production processes and simplified installation processes. Among them, the upper end of the cantilever portion 14 is used to carry the body of the forklift. Specifically, a mounting flange is provided on the upper end surface of the cantilever portion 14, and the body of the forklift can be effectively fixedly connected through the mounting flange. Preferably, the projection of the mounting center point of the mounting flange in the horizontal plane falls within the projection range of the axis of the driving wheel 2 in the horizontal plane. In the vertical direction, relative to the wheel, the forces on the left and right sides are relatively uniform, thereby ensuring better stability of the driving wheel 2.

[0080] Optionally, the lower end of the cantilever portion 14 is arc-shaped, adapted to the end face shape of the driving wheel 2, and a wheel accommodating space 15 is formed between the cantilever portion 14 and the support portion 12. The above setting is used to accommodate the driving wheel 2, with a more compact structure and can also protect the driving wheel 2 during use.

[0081] Optionally, a weight-reducing groove 141 is provided on the cantilever portion 14, and the weight-reducing groove 141 is recessed toward the mounting portion 11 side in the vertical plane. This design can reduce the overall weight of the forklift driving wheel assembly to a certain extent. Optionally, the number of the weight-reducing grooves 141 can be set to be multiple, and the side walls of the multiple weight-reducing grooves 141 form reinforcing ribs, which can improve the strength of the cantilever portion 14.

[0082] Optionally, the mounting bracket 1 is made of aluminum material. Compared with the steel mounting brackets in the prior art, it has a lighter mass and can further meet the requirements of lightweight of the forklift driving wheel assembly.

[0083] Figure 7 Shows a partial exploded view of the forklift driving wheel assembly provided in this embodiment. As Figure 7 And in combination with Figure 1As shown, the forklift driving wheel assembly further includes a driving mechanism 6. The driving mechanism 6 includes a driving source 61 disposed on the mounting bracket 1 and a gear reduction assembly 62 connected to the output end of the driving source 61. The driving source 61 drives the driving wheel 2 to rotate through the gear reduction assembly 62. By providing the gear reduction assembly 62, the output speed of the driving source 61 can be reduced while the output torque is increased to ensure the stability of the rotation of the driving wheel 2. Optionally, the driving source 61 is a permanent magnet brushless motor.

[0084] Further, the gear reduction assembly 62 includes at least three reduction gears meshing in sequence, and the central connection line of the at least three reduction gears is arranged at an angle with the vertical direction. This design can shorten the arrangement distance of the gear reduction assembly 62 in the vertical direction, making the position of the axle 3 relatively low, ensuring that the installation center of the forklift is relatively low and making its operation more stable.

[0085] In this embodiment, the gear reduction assembly 62 includes three reduction gears, namely a primary reduction gear 621, a secondary reduction gear 622, and a tertiary reduction gear 623 that mesh in sequence. The primary reduction gear 621 is connected to the output end of the driving source 61, and the tertiary reduction gear 623 is connected to the axle 3. When the driving source 61 operates, the driving force can be transmitted to the driving wheel 2 after being sequentially reduced by the primary reduction gear 621, the secondary reduction gear 622, and the tertiary reduction gear 623. Of course, the specific number of reduction gears in this embodiment is not limited, and designers can adjust the number of reduction gears according to actual usage requirements.

[0086] Figure 8 The structural schematic diagram of the forklift driving wheel assembly provided in this embodiment with the mounting bracket 1 hidden is shown. As Figure 8 and in combination with Figure 1 shown, the driving mechanism 6 further includes a planetary gear assembly 63. The output end of the driving source 61 is connected to the input end of the gear reduction assembly 62 through the planetary gear assembly 63, and the driving wheel 2 is connected to the output end of the gear reduction assembly 62. Through the combination of the planetary gear assembly 63 and the gear reduction assembly 62, the ordinary gear reduction mechanism in the prior art is replaced. On the basis of ensuring a small size, a better reduction ratio can be achieved. At the same time, the reduction ratio can be increased on the premise that the rotation speed of the driving wheel 2 remains unchanged. Among them, the reduction ratio can be increased to about 69, which is equivalent to 2 - 3 times that of the prior art. As a result, the gear reduction assembly 62 can be adapted to a driving source 61 with a small torque, a large capacity, and a small volume. Compared with the traditional driving source, the volume of the driving source 61 in this embodiment is reduced by 20% - 30%, which can meet the structural requirements of the forklift for compactness and miniaturization. It should be noted that the input end of the gear reduction assembly 62 is the primary reduction gear 621, and the output end of the gear reduction assembly 62 is the tertiary reduction gear 623.

[0087] Optionally, the drive source 61 is disposed on the first side 101 of the mounting bracket 1, the drive wheel 2 is disposed on the first side 101 of the mounting bracket 1 and is offset from the drive source 61, and the gear reduction assembly 62 is disposed on the second side 102 of the mounting bracket 1. This arrangement, in combination with the arrangement in which the central connection line of at least three reduction gears forms an angle with the vertical direction, can further lower the installation center of the forklift and improve the structural stability of the entire forklift.

[0088] Figure 9 The structural schematic diagram of the drive source 61 provided in this embodiment is shown. Figure 10 The exploded schematic diagram of the planetary gear assembly 63 provided in this embodiment is shown. As Figures 9-10 and in combination with Figure 8 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 disposed on the mounting bracket 1. The ring gear 631 is of an annular structure, and internal teeth 6311 are provided on the inner wall of the ring gear 631 and are distributed at intervals along its circumference; 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. It should be noted that 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 rotates synchronously with the sun gear 632; a plurality of planetary gears 633 are all located in a plane perpendicular to the rotation axis of the sun gear 632 and are arranged at intervals along the circumference of the ring gear 631, and each planetary gear 633 meshes with the internal teeth 6311 and the sun gear 632 at the same time; pivot holes 6341 corresponding to the planetary gears 633 one by one are provided on the gear carrier 634, and each planetary gear 633 is pivotally connected to the pivot hole 6341 and 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 operates, it can drive the sun gear 632 to rotate. The sun gear 632 can drive a plurality of planetary gears 633 meshing with it to move along the circumference of the ring gear 631, thereby driving the gear carrier 634 to rotate, and further realizing the rotation of the input end of the gear reduction assembly 62.

[0089] Optionally, there are at least two planetary gear assemblies 63. The at least two planetary gear assemblies 63 are connected in series in sequence, which can further increase the reduction ratio. In this embodiment, the number of planetary gear assemblies 63 is two. It has been verified that when the drive source in the prior art drives the drive wheel to rotate only through the gear reduction assembly, the reduction ratio is 22 - 30; while in this embodiment, when the drive source 61 drives the drive wheel 2 through two planetary gear assemblies 63 and a gear reduction assembly 62, the reduction ratio is approximately 69. Of course, in other embodiments, the number of planetary gear assemblies 63 can also be one or any number of 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 among two adjacent planetary gear assemblies 63 is interference-fitted on the gear carrier 634 of the upper-level planetary gear assembly 63.

[0090] When the number of planetary gear assemblies 63 is one, the sun gear 632 of the planetary gear assembly 63 and the output end of the drive source 61 are of an integral structure; when the number of planetary gear assemblies 63 is greater than or equal to two, the sun gear 632 of one of the two planetary gear assemblies 63 arranged close to the drive source 61 is of an integral structure with the output end of the drive source 61, and the gear carrier 634 of the other is connected to the input end of the gear reduction assembly 62. This design can improve the installation efficiency while ensuring the concentricity of the installation between 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 heading process or die forming.

[0091] In this embodiment, the drive source 61 is a permanent magnet brushless motor, and the magnetic steel of the permanent magnet brushless motor is made of ferrite material. The ferrite material has the advantages of low price, simple manufacturing process, large coercive force, and strong anti-demagnetization ability. Based on the above structure, it can meet the selection of the planetary gear assembly 63.

[0092] Continue as Figure 7 As shown, the mounting bracket 1 further includes a side cover 16. A receiving cavity 111 for receiving the gear reduction assembly 62 and the planetary gear assembly 63 is provided on the mounting portion 11, and the side cover 16 can cover the opening of the receiving cavity 111. The setting of the side cover 16 can protect the gear reduction assembly 62 and prevent it from being affected by dust and rust due to long-term exposure, which may affect its normal working performance. Integrating the receiving cavity 111 for the gear reduction assembly 62 and the planetary gear assembly 63 on the mounting portion 11 and forming it integrally can improve production efficiency and avoid the disadvantage of large errors caused by cumbersome installation procedures. Especially for the transmission structure, large errors will inevitably cause phenomena such as jitter, loud noise, and unstable driving.

[0093] Optionally, the side cover 16 is detachably connected to the mounting portion 11. When the gear reduction assembly 62 fails and needs to be repaired, the operator can conveniently remove the side cover 16 to repair or replace the gear reduction assembly 62. In this embodiment, the side cover 16 is connected to the mounting portion 11 by bolts. Bolt connection has the advantages of firm connection and convenient disassembly and assembly. Of course, in other embodiments, the side cover 16 can also be connected to the mounting portion 11 by means of snap connection, plug connection, riveting, etc. This embodiment does not limit this.

[0094] When the gear reduction assembly 62 is working, a large amount of heat will be generated. If it cannot be dissipated in time, it will affect the working performance of the gear reduction assembly 62. In this embodiment, a coolant is hermetically arranged in the accommodating cavity 111, which can cool the gear reduction assembly 62 to timely discharge the heat generated when the gear reduction assembly 62 is working, so as to ensure the working performance of the gear reduction assembly 62.

[0095] It can be understood that while the coolant cools the gear reduction assembly 62, its own temperature will rise, increasing the air pressure in the accommodating cavity 111. When the air pressure exceeds the preset value, the coolant will seep out from the seal between the side cover 16 and the mounting portion 11. To solve this problem, in this embodiment, a pressure relief valve 17 is further provided on the mounting portion 11. The pressure relief valve 17 is located above the liquid level of the coolant stored in the accommodating cavity 111, and the pressure relief valve 17 is used to communicate the accommodating cavity 111 with 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 pushed open to communicate the accommodating cavity 111 with the outside, so as to keep the air pressure in the accommodating cavity 111 stable and prevent the coolant from leaking due to excessive temperature.

[0096] As Figure 7 and combined with Figure 2 shown, in this embodiment, a connecting flange 5 is connected to the side of the driving wheel 2 close to the supporting portion 12. The connecting flange 5 and the wheel shaft 3 are of an integrally formed structure to ensure that the driving wheel 2 and the gear reduction assembly 62 have a high concentricity in cooperation. Specifically, the connecting flange 5 and the wheel shaft 3 are integrally formed by cold heading process, and the other mounting planes on the connecting flange 5 are completed by turning process after the cold heading forming process.

[0097] Optionally, the driving wheel 2 is connected to the connecting flange 5 by screws, with firm connection and convenient disassembly and assembly.

[0098] This embodiment also provides a forklift truck, which includes a forklift truck body and the above-mentioned forklift truck drive wheel assembly. The forklift truck drive wheel assembly is arranged on the forklift truck body. By applying the above-mentioned forklift truck drive wheel assembly, it is possible to reduce the overall weight of the drive wheel assembly and the thickness in the axial direction of the drive wheel 2 while ensuring the stable installation of the drive wheel assembly, thereby meeting the requirements of lightweight and compactness.

[0099] Note that the basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A forklift driving wheel assembly, characterized in that, Comprising: An installation bracket (1), including an installation part (11) and a support part (12) protruding from one side of the installation part (11). A transition slope structure (13) is provided between the installation part (11) and the support part (12), and the thickness of the transition slope structure (13) gradually increases from top to bottom; A driving wheel (2) rotatably arranged on the side of the support part (12) connecting the transition slope structure (13); A driving mechanism (6) arranged on the installation part (11), and the driving mechanism (6) is configured to drive the driving wheel (2) to rotate; 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 center points corresponding to the outer edge arcs of the first slope (131), the outer edge arcs of the second slope (132), and the docking arc between the first slope (131) and the second slope (132) in the projection on the plane perpendicular to the axis of the driving wheel (2) are respectively offset.

2. The forklift driving wheel assembly according to claim 1, characterized in that The corresponding centers of the projections of the first slope (131), the second slope (132), and the docking arc between the first slope (131) and the second slope (132) are collinearly arranged. Preferably, the second slope (132) covers the outside of the support part (12), the first slope (131) is located above the second slope (132), and partially covers the outside of the second slope (132). Preferably, the first slope (131) includes at least two arc surfaces connected in sequence, and a fillet transition is adopted between adjacent two arc surfaces. Preferably, the first slope (131) includes a first arc surface (1311), a second arc surface (1312), and a third arc surface (1313) arranged in sequence 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 installation 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 circumferential extension lengths of the first slope (131) and the second slope (132) is 0.25 - 0.

30.

4. The forklift drive wheel assembly according to claim 1, characterized in that, A through installation hole (121) is provided on the support part (12), and the driving wheel (2) is rotatably arranged in the installation hole (121) through a wheel shaft (3). Preferably, at least one bearing (4) is provided between the wheel shaft (3) and the installation hole (121), and the projection of the second slope (132) on the horizontal plane can cover at least one of the bearings (4). Preferably, a limiting portion (122) is formed by a protrusion on the inner side wall of the mounting hole (121), and two bearings (4) are provided. The two bearings (4) are arranged on opposite sides of the limiting portion (122), and the end surfaces of the two bearings (4) close to the limiting portion (122) are respectively in contact with the side walls of the limiting portion (122).

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

6. The forklift driving wheel assembly according to claim 4, characterized in that, The driving wheel (2) comprises a hub component (21) and a wheel component (22); the hub component (21) is mounted on the wheel axle (3) and is fixedly arranged on the wheel axle (3); the wheel component (22) is mounted on the hub component (21) and is fixedly connected to the wheel hub component (21); the driving wheel (2) rotates following the wheel axle (3); the axes of the two are colinear and rotate synchronously. Preferably, the hub component (21) comprises a first hub (211) and a second hub (212); the first hub (211) is mounted on the wheel axle (3) and extends a first mounting portion (213) outwardly; the wheel component (22) is mounted on an outer end surface of the second hub (212); the second hub (212) extends a second mounting portion (214) toward the first hub (211); the outer end surface of the first mounting portion (213) abuts against an inner side wall of the second hub (212); the outer end surface of the second mounting portion (214) abuts against an outer side wall of the first hub (211); and the side walls of the first mounting portion (213) and the second mounting portion (214) are fitted and abutted and fixedly connected by a locking member. Preferably, a side of the first hub (211) facing the support portion (12) is recessed to form an avoidance groove (215), the avoidance groove (215) is inserted into the mounting hole (121) close to the inner side wall of the wheel axle (3), and a sealing member is filled between the gap with the mounting hole (121), and an avoidance gap is formed between the avoidance groove (215) and the support portion (12) away from the inner side wall of the wheel axle (3).

7. The forklift drive wheel assembly according to claim 1, wherein, A cantilever portion (14) is integrated on the side of the mounting portion (11) facing away from the supporting portion (12); the upper end of the cantilever portion (14) is used to receive the body of the forklift, and the projection of the center point of the receiving portion in the horizontal plane falls on the projection of the axis of the driving wheel (2) in the horizontal plane. Preferably, the lower end of the cantilever portion (14) is adapted to the end surface shape of the driving wheel (2), and a wheel accommodating space (15) is formed between the lower end of the cantilever portion (14) and the support portion (12). Preferably, a weight-reducing groove (141) is provided on the cantilever portion (14), and the weight-reducing groove (141) is recessed toward one side of the mounting portion (11) in a vertical plane.

8. The forklift driving wheel assembly according to claim 1, characterized in that, The driving mechanism (6) includes a driving source (61) disposed on the mounting bracket (1) and a gear reduction assembly (62) connected to the output end of the driving source (61). The driving source (61) drives the driving wheel (2) to rotate through the gear reduction assembly (62). Preferably, the gear reduction assembly (62) includes at least three reduction gears that are sequentially engaged, and the central connection lines of the at least three reduction gears are arranged at an angle to the vertical direction. Preferably, the mounting bracket (1) further includes a side cover (16). A receiving cavity (111) for receiving the gear reduction assembly (62) is provided on the mounting portion (11), and the side cover (16) can cover the opening of the receiving cavity (111). Preferably, a pressure relief valve (17) is further provided on the mounting portion (11). The pressure relief valve (17) is located above the liquid stored in the receiving cavity (111), and the pressure relief valve (17) is used to communicate the receiving cavity (111) with 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 an aluminum material.

10. A forklift, characterized in that, It includes a forklift body and a forklift driving wheel assembly according to any one of claims 1-9, and the forklift driving wheel assembly is disposed on the forklift body.

Images