Driving system for wheel type carrying equipment and wheel type carrying equipment

Abstract

The utility model discloses a driving system for wheel type carrying equipment, and the driving system comprises a wheel which comprises a hub and a tire sleeving the hub; the driving unit extends into the inner ring of the hub, and the output end of the driving unit is connected with the hub to drive the hub to rotate; the annular support is fixed to the driving unit and located between the driving unit and the hub; the supporting piece is arranged outside the annular support in a sleeving mode and located between the hub and the annular support; the hub is rotationally connected to the annular support through a supporting piece. The utility model further discloses the wheel type carrying equipment comprising the driving system. The radial load brought by the load can be borne through the supporting piece, so that the requirements for the size and the material performance of the driving unit are greatly reduced, the design size of the whole machine can be reduced, and the production cost is remarkably reduced.

Description

Technical Field

[0001] The present application relates to the field of drive control technology, and in particular to a drive system for wheeled transport equipment and the wheeled transport equipment. Background Art

[0002] Wheeled handling equipment refers to handling equipment with movable wheels used to transport materials, such as forklifts, handling robots, and automatic guided vehicles. Wheeled handling equipment generally includes a chassis (frame), wheels installed on both sides of the chassis, and a drive system installed on the chassis and used to drive the wheels to move. The drive system in the wheeled handling equipment in the related art is generally a drive motor and a reducer. The output end of the reducer is connected to the wheels on both sides of the chassis and drives the wheels to rotate relative to the chassis, thereby achieving the purpose of moving the entire machine. However, for wheeled handling equipment that requires a large load, the reducer in the drive system in the related art needs to have a large volume to withstand the corresponding radial load, and the material requirements for the reducer are relatively high. This results in a high production cost for such wheeled handling equipment with a large load capacity, and the overall size is generally larger because it needs to adapt to a larger-sized reducer. Utility Model Content

[0003] The present application aims to solve one of the technical problems in the related art to a certain extent. To this end, the present application provides a driving system for a wheeled transport device and a wheeled transport device.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a drive system for a wheeled transport device, the drive system comprising:

[0005] A wheel, comprising a hub and a tire sleeved outside the hub;

[0006] A driving unit extending into the inner ring of the wheel hub, wherein an output end of the driving unit is connected to the wheel hub to drive the wheel hub to rotate;

[0007] an annular bracket, which is fixed to the drive unit and located between the drive unit and the wheel hub; and,

[0008] A support member, which is sleeved outside the annular bracket and located between the wheel hub and the annular bracket;

[0009] Wherein, the wheel hub is rotatably connected to the annular bracket through a supporting member.

[0010] The application of this application has the following beneficial effects: by extending the drive unit into the inner ring of the wheel hub for setting, the annular bracket and the support are used to ensure the rotational connection between the wheel hub and the drive unit, so that the radial load caused by the load can be borne by the support. After such setting, the wheeled transport equipment using the drive system can also use the support to bear the radial load even if the load is large, so the requirements for the size and material performance of the drive unit are greatly reduced, which can reduce the design size of the whole machine and significantly reduce the production cost.

[0011] Optionally, the driving unit includes a driving motor and a reducer connected to the driving motor, and the driving system also includes a connecting plate, and the output end of the reducer is connected to the wheel hub through the connecting plate.

[0012] Optionally, the housing of the reducer is formed with an annular flange, the annular bracket is arranged around the outside of the driving motor, and one end of the annular bracket facing the reducer is fixedly mounted on the annular flange.

[0013] Optionally, the output shaft of the drive motor is provided with a sun gear, the reducer is provided with a planetary gear matched with the sun gear, and the drive motor and the reducer are driven by the meshing of the sun gear and the planetary gear. The transmission scheme using the sun gear and the planetary gear can avoid the use of couplings, flat key bushings and other connectors, which can not only save design space, but also improve transmission efficiency.

[0014] Optionally, the connecting plate is fixedly connected to the wheel hub, and the connecting plate is connected to the output end of the reducer by a pin or a key. The power transmission between the reducer and the wheel hub adopts a pin or a key, which only constrains the circumferential direction and has a certain degree of freedom in the axial direction, thereby preventing the axial load generated by the load from being transmitted to the drive unit. At the same time, it is convenient for the steering operation control of the wheeled transport equipment.

[0015] Optionally, the connecting plate is provided with a plurality of first mounting holes arranged circumferentially and a plurality of second mounting holes arranged circumferentially, the ring formed around the plurality of second mounting holes is coaxial with the ring formed around the plurality of first mounting holes, and the inner diameter of the ring formed around the plurality of second mounting holes is larger than the inner diameter of the ring formed around the plurality of first mounting holes; the connecting plate is fixedly connected to the wheel hub by screws passing through the second mounting holes, and the connecting plate is connected to the output end of the reducer by a pin shaft or a key passing through the first mounting holes. The connecting plate adopts such a structure and is fixedly connected to the wheel hub by screws, which is convenient for disassembly operation, that is, the connecting plate is designed to be detachable relative to the wheel hub.

[0016] Optionally, the support member is a bearing, the outer ring of the bearing is positioned on the inner ring surface of the hub, and the inner ring of the bearing is positioned on the outer ring surface of the annular bracket.

[0017] Optionally, the inner ring surface of the wheel hub is formed with a positioning groove for the outer ring of the bearing to be embedded, one end of the annular bracket is provided with a retaining ring for limiting the inner ring of the bearing, and the other end of the annular bracket is formed with a convex edge for limiting the inner ring of the bearing. The bearing as a support is axially positioned by the positioning groove, so that the axial load brought by the load can also be borne by the support, and the drive unit only needs to meet the torque output.

[0018] Optionally, two bearings are provided, and the two bearings are arranged axially at intervals. A step is formed on the inner ring surface of the wheel hub, a retaining ring is provided at the end of the wheel hub, and a spacer is also provided on the wheel hub between the step and the retaining ring. The positioning groove is formed between the step and the spacer and between the spacer and the retaining ring.

[0019] In addition, the present application also provides a wheeled transport device, including a chassis, the wheeled transport device also includes a drive system as described in any one of the above technical solutions, and the drive system is installed on the chassis. The reasoning process of the beneficial effects of the wheeled transport device provided by the present application and the aforementioned drive system is similar, and will not be repeated here.

[0020] These features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present application will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present application. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application will be further described below in conjunction with the accompanying drawings:

[0022] Figure 1 A schematic diagram of a drive system for a wheeled transport device provided in an embodiment of the present application;

[0023] Figure 2 A partial cross-sectional view of a drive system provided in an embodiment;

[0024] Figure 3 for Figure 1 A magnified schematic diagram of part A;

[0025] Figure 4 for Figure 2 A magnified schematic diagram of part B;

[0026] Figure 5 is a schematic diagram of the structure of the drive unit;

[0027] Figure 6It is a structural schematic diagram of the drive unit from another perspective;

[0028] Figure 7 is a structural schematic diagram of the connecting plate;

[0029] Figure 8 A cross-sectional view of a tire.

[0030] Among them, 1. wheel hub, 10. step, 11. retaining ring, 12. first connecting hole, 13. second connecting hole, 2. tire, 3. driving motor, 4. reducer, 40. annular flange, 41. pin shaft, 5. annular bracket, 50. retaining ring, 51. flange, 52. connecting part, 6. supporting member, 7. connecting plate, 70. first mounting hole, 71. second mounting hole, 710. screw, 8. spacer. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments based on the embodiments are intended to be used to explain the present application and cannot be understood as limiting the present application.

[0032] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0033] This embodiment provides a drive system for a wheeled transport device, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in , the drive system includes a wheel, a drive unit, an annular bracket 5 and a support 6. The wheel includes a hub 1 and a tire 2 sleeved outside the hub 1, the drive unit extends into the inner ring of the hub 1, and the output end of the drive unit is connected to the hub 1 to drive the hub 1 to rotate. The annular bracket 5 is fixed to the drive unit and is located between the drive unit and the hub 1, and the support 6 is sleeved outside the annular bracket 5 and is located between the hub 1 and the annular bracket 5, and the hub 1 is rotatably connected to the annular bracket 5 through the support 6.

[0034] The drive system provided in this embodiment is arranged by extending the drive unit into the inner ring of the hub 1, and using the annular bracket 5 and the support 6 to ensure the rotational connection between the hub 1 and the drive unit, so that the radial load caused by the load can be borne by the support 6. After such arrangement, the wheeled transport equipment using the drive system can also bear the radial load by using the support 6 even if the load is large, so that the requirements for the size and material performance of the drive unit are greatly reduced, which can reduce the design size of the whole machine and significantly reduce the production cost.

[0035] Specifically in this embodiment, the drive unit includes a drive motor 3 and a reducer 4 connected to the drive motor 3, and the drive system also includes a connecting plate 7, and the output end of the reducer 4 is connected to the wheel hub 1 through the connecting plate 7. Further, in this embodiment, the transmission mode between the drive motor 3 and the reducer 4 is designed. Specifically, the output shaft of the drive motor 3 in this embodiment is provided with a sun gear, and the reducer 4 is provided with a planetary gear adapted to the sun gear, and the drive motor 3 and the reducer 4 are driven by the meshing of the sun gear and the planetary gear. The transmission scheme using the sun gear and the planetary gear can avoid the use of couplings, flat key bushings and other connectors, which can not only save design space, but also improve transmission efficiency. It should be noted that the drive unit in this embodiment extends into the inner ring of the wheel hub 1, specifically, the reducer 4 as a whole and most of the drive motor 3 are arranged in the inner ring of the wheel hub 1, and the end of the drive motor 3 away from the connecting plate 7 is partially located outside the wheel hub 1. Of course, in other optional embodiments, the drive unit can also be arranged in the inner ring of the wheel hub 1 as a whole.

[0036] In addition, as mentioned above, the annular bracket 5 is fixed to the drive unit. Specifically in this embodiment, the housing of the reducer 4 is formed with an annular flange 40, the annular bracket 5 is arranged around the outside of the drive motor 3, and one end of the annular bracket 5 facing the reducer 4 is fixedly mounted on the annular flange 40. Figure 3 , Figure 5 and Figure 6 As shown in the figure, the outer ring end of the annular flange 40 and the end of the annular bracket 5 facing the reducer 4 are provided with a mutually matching overlapping structure, and the two are initially fixed by the overlapping structure and then fastened by threaded connection.

[0037] Combination Figure 1 , Figure 2 , Figure 5 and Figure 7As shown in the figure, the connecting plate 7 in this embodiment is fixedly connected to the wheel hub 1, and at the same time, the connecting plate 7 is connected to the output end of the reducer 4 through a pin 41. It is easy to understand that in other optional embodiments, the connecting plate 7 and the output shaft of the reducer 4 can also be connected by a key. The power transmission between the connecting plate 7 and the reducer 4 and the wheel hub 1 adopts a connection method of a pin 41 or a key, which only constrains the circumference, and has a certain degree of freedom in the axial direction, which can avoid the axial load generated by the load from being transmitted to the drive unit. Among them, when the key connection scheme is adopted, it can be a flat key, a spline or a semicircular key. It is convenient for the steering operation control of the wheeled transport equipment. Further, the connecting plate 7 in this embodiment is provided with a plurality of first mounting holes 70 arranged in the circumferential direction and a plurality of second mounting holes 71 arranged in the circumferential direction, and the ring formed by the plurality of second mounting holes 71 is coaxial with the ring formed by the plurality of first mounting holes 70, and the inner diameter of the ring formed by the plurality of second mounting holes 71 is greater than the inner diameter of the ring formed by the plurality of first mounting holes 70. The connecting plate 7 is fixedly connected to the wheel hub 1 by means of screws 710 passing through the second mounting holes 71. Specifically, the connecting plate 7 is fixedly connected to the side of the wheel hub 1 by means of screws 710 passing through the second mounting holes 71. The connecting plate 7 is connected to the output end of the reducer 4 by means of a pin 41 or a key passing through the first mounting holes 70. The connecting plate 7 adopts such a structure and is fixedly connected to the wheel hub 1 by means of screws 710, which facilitates the disassembly operation, that is, the connecting plate is designed to be detachable relative to the wheel hub.

[0038] The support member 6 in this embodiment is a bearing. Preferably, the bearing can be a deep groove ball bearing, a cylindrical roller bearing, a tapered roller bearing or the like that is suitable for bearing radial loads. It is easy to understand that in other optional embodiments, a sleeve with wear resistance and a low friction coefficient can also be used as the support member 6. The outer ring of the bearing in this embodiment is positioned on the inner ring surface of the hub 1, and the inner ring of the bearing is positioned on the outer ring surface of the annular bracket 5. The positioning described here means that the outer ring of the bearing has good stability in both radial and axial directions relative to the inner ring surface of the hub 1, and correspondingly, the inner ring of the bearing has good stability in both radial and axial directions relative to the outer ring surface of the annular bracket 5.

[0039] Combination Figures 1 to 4As shown in , in this embodiment, a positioning groove for the outer ring of the bearing to be embedded is formed on the inner ring surface of the hub 1, a retaining ring 50 for limiting the inner ring of the bearing is provided at one end of the annular bracket 5, and a convex edge 51 for limiting the inner ring of the bearing is formed at the other end of the annular bracket 5. The bearing as the support member 6 is positioned axially and radially through the positioning groove, so that the axial load brought by the load can also be borne by the support member 6, and the drive unit only needs to meet the torque output. Specifically, two bearings are provided in this embodiment, and the two bearings are arranged at intervals along the axial direction. A step 10 is formed on the inner ring surface of the hub 1, and a retaining ring 11 is provided at the end of the hub 1, and a spacer 8 is also provided on the hub 1 between the step 10 and the retaining ring 11, and positioning grooves are formed between the step 10 and the spacer 8 and between the spacer 8 and the retaining ring 11.

[0040] That is, in this embodiment, the inner ring of the bearing is axially and radially positioned by the annular bracket 5, the protrusion 51 on the annular bracket 5 and the retaining ring 50 fixed on the annular bracket 5, and the outer ring of the bearing is axially and radially positioned by the inner ring surface of the hub 1, the step 10 formed on the hub 1, the retaining ring 11 and the spacer 8.

[0041] like Figure 8 As shown in , the wheel in this embodiment includes a hub 1 and a tire 2 sleeved outside the hub 1. The tire 2 is generally made of rubber and sleeved outside the hub 1 by fastening. The hub 1 is provided with a first connecting hole 12 and a second connecting hole 13. The hub is fixedly connected to the connecting plate 7 through the first connecting hole 12 using screws 710, and the hub 1 is fixedly connected to the retaining ring 11 through the second connecting hole 13 using screws.

[0042] The assembly process of the drive system provided in this embodiment is described as follows: first, the bearing is fixedly installed in the positioning groove through its outer ring, and the spacer 8 is installed between the two bearings; then the retaining ring 11 is fixedly installed on the wheel hub 1 to form a wheel hub unit; then the drive motor 3 and the reducer 4 are assembled into an integral power unit, and then the power unit is installed on the annular bracket 5, and then the wheel hub unit is installed on the annular bracket 5, and then the retaining ring 50, the annular bracket 5 and the annular flange 40 are fixedly connected together, and the retaining ring 50 is in contact with the inner ring of the bearing on one side. Finally, the connecting plate 7 on one side is assembled.

[0043] The drive system provided in this embodiment can be applied to a wheeled transport device, wherein the wheeled transport device comprises a chassis and the drive system provided in this embodiment, and the drive system is mounted on the chassis. The drive system can be fixedly connected to the chassis via the annular bracket 5 in the drive system. Specifically, Figure 1 and Figure 2As shown in , a connecting portion 52 is formed on the end of the annular bracket 5 away from the connecting plate 7. The connecting portion 52 is a plate structure surrounding the outer ring of the annular bracket 5. A through hole for fixing with the chassis is provided on the connecting portion 52. Bolts can be passed through the through hole to fix the connecting portion 52 with the chassis. The wheeled handling equipment can be an automatic guided transport vehicle, a forklift or a handling robot, etc., which is often used in scenes such as smart warehousing and production lines to carry material boxes or production materials.

[0044] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific implementations. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A drive system for wheeled transport equipment, characterized in that: The drive system comprises: A wheel, comprising a wheel hub (1) and a tire (2) sleeved outside the wheel hub (1); A drive unit, which extends into the inner ring of the wheel hub (1), and an output end of the drive unit is connected to the wheel hub (1) to drive the wheel hub (1) to rotate; an annular bracket (5) fixed to the drive unit and located between the drive unit and the wheel hub (1); and A support member (6) which is sleeved outside the annular support (5) and is located between the wheel hub (1) and the annular support (5); The wheel hub (1) is rotatably connected to the annular bracket (5) via a support member (6).

2. The drive system according to claim 1, characterized in that: The drive unit comprises a drive motor (3) and a reducer (4) connected to the drive motor (3); the drive system further comprises a connecting plate (7); an output end of the reducer (4) is connected to the wheel hub (1) via the connecting plate (7).

3. The drive system according to claim 2, characterized in that: The outer shell of the reducer (4) is formed with an annular flange (40), the annular bracket (5) is arranged around the outside of the drive motor (3), and one end of the annular bracket (5) facing the reducer (4) is fixedly mounted on the annular flange (40).

4. The drive system according to claim 2, characterized in that: The output shaft of the drive motor (3) is provided with a sun gear, the reducer (4) is provided with a planetary gear matched with the sun gear, and the drive motor (3) and the reducer (4) are driven by meshing of the sun gear and the planetary gear.

5. The drive system according to claim 2, characterized in that: The connecting plate (7) is fixedly connected to the wheel hub (1), and the connecting plate (7) is connected to the output end of the reducer (4) via a pin (41) or a key.

6. The drive system according to claim 5, characterized in that: The connecting plate (7) is provided with a plurality of first mounting holes (70) arranged in the circumferential direction and a plurality of second mounting holes (71) arranged in the circumferential direction, the circular ring formed by the plurality of second mounting holes (71) is coaxial with the circular ring formed by the plurality of first mounting holes (70), and the inner diameter of the circular ring formed by the plurality of second mounting holes (71) is greater than the inner diameter of the circular ring formed by the plurality of first mounting holes (70); The connecting plate (7) is fixedly connected to the wheel hub (1) via a screw (710) passing through the second mounting hole (71), and the connecting plate (7) is connected to the output end of the reducer (4) via a pin (41) or a key passing through the first mounting hole (70).

7. The drive system according to any one of claims 1 to 6, characterized in that: The support member (6) is a bearing, the outer ring of the bearing is positioned on the inner ring surface of the wheel hub (1), and the inner ring of the bearing is positioned on the outer ring surface of the annular bracket (5).

8. The drive system according to claim 7, characterized in that: The inner ring surface of the wheel hub (1) is formed with a positioning groove for the outer ring of the bearing to be embedded in, one end of the annular bracket (5) is provided with a retaining ring (50) for limiting the inner ring of the bearing, and the other end of the annular bracket (5) is formed with a convex edge (51) for limiting the inner ring of the bearing.

9. The drive system according to claim 8, characterized in that: Two bearings are provided, and the two bearings are spaced apart in the axial direction. A step (10) is formed on the inner ring surface of the wheel hub (1), a retaining ring (11) is provided at the end of the wheel hub (1), and a spacer (8) is also provided on the wheel hub (1) between the step (10) and the retaining ring (11), and the positioning grooves are formed between the step (10) and the spacer (8) and between the spacer (8) and the retaining ring (11).

10. A wheeled transport device comprising a chassis, characterized in that: The wheeled transport equipment further comprises a drive system as claimed in any one of claims 1 to 9, the drive system being mounted on the chassis.

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