Transport vehicle and its wheel assembly

Abstract

The present invention discloses a transport vehicle and its wheel assembly. The wheel assembly includes: a mounting seat (11); a rotating cylinder (12) rotatably connected to the mounting seat (11), and the rotating cylinder (12) can rotate about its axis; a wheel frame (13), including a transmission box (131), the transmission box (131) includes a first end connected to the end of the rotating cylinder (12) and a second end opposite to the first end; a driving wheel (14) provided on the second end; a rotating shaft (15) passing through the rotating cylinder (12) and coaxially arranged with the rotating cylinder (12); a transmission mechanism (18) provided in the transmission box (131), which is respectively in transmission connection with the rotating shaft (15) and the driving wheel (14). After the transport vehicle is installed with this wheel assembly, it can travel and turn along a vertical track.

Description

Technical Field

[0001] The present invention generally relates to a wheel technology, and more particularly, to a transport vehicle and its wheel assembly. Background Art

[0002] With the advent of the Industrial 4.0 era, automated guided vehicles (AGVs) used in the logistics and transportation field have witnessed continuous and rapid development. A relatively common application is that an AGV shuttles along a guide rail according to a predetermined path and stores and retrieves goods at a target location. In this scenario, the rational design of the wheels plays a crucial role, especially for the guide rails laid on stereoscopic shelves, as there may be complex environments such as the vertical climbing of the trolley and the horizontal travel at high altitudes.

[0003] Existing AGVs can only travel back and forth along horizontally arranged guide rails and cannot perform active steering.

[0004] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present invention, and thus it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] A series of simplified concepts are introduced in the summary of the invention section, which will be further elaborated in the detailed implementation section. The summary of the invention section does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0006] One technical problem to be solved by the present invention is how a transport vehicle can run on both horizontal and vertical guide rails and perform steering travel between the horizontal and vertical guide rails. To solve the above technical problem, the present invention provides a wheel assembly, which includes: a mounting seat; a rotating cylinder rotatably connected to the mounting seat, the rotating cylinder being capable of rotating about its axis; a wheel frame including a transmission box, the transmission box including a first end connected to an end of the rotating cylinder and a second end opposite to the first end; a driving wheel provided on the second end; a rotating shaft passing through the rotating cylinder and coaxially arranged with the rotating cylinder; and a transmission mechanism provided in the transmission box and in transmission connection with the rotating shaft and the driving wheel respectively.

[0007] According to an embodiment of the present invention, a first rotating shaft is provided on the driving wheel, and the first rotating shaft is rotatably connected to the transmission box;

[0008] The transmission mechanism includes

[0009] a first bevel gear sleeved on the rotating shaft;

[0010] A second rotating shaft rotatably connected to the transmission case and parallel to the first rotating shaft;

[0011] A second bevel gear sleeved on the second rotating shaft and meshing with the first bevel gear;

[0012] Wherein, the second rotating shaft is in transmission connection with the first rotating shaft.

[0013] According to an embodiment of the present invention, the transmission mechanism further includes

[0014] A first cylindrical gear sleeved on the first rotating shaft;

[0015] A second cylindrical gear sleeved on the second rotating shaft;

[0016] A mandrel installed on the inner wall of the transmission case and parallel to the first rotating shaft;

[0017] A third cylindrical gear sleeved on the mandrel and capable of rotating around the mandrel, and the third cylindrical gear meshes with the first cylindrical gear and the second cylindrical gear respectively.

[0018] According to an embodiment of the present invention, the mandrel is arranged between the first rotating shaft and the second rotating shaft, and the axes of the first rotating shaft, the second rotating shaft and the mandrel are coplanar.

[0019] According to an embodiment of the present invention, the middle part of the second rotating shaft is rotatably connected to the transmission case, the second bevel gear and the second cylindrical gear are respectively arranged at both ends of the second rotating shaft, and the first bevel gear is located between the second bevel gear and the second cylindrical gear.

[0020] According to an embodiment of the present invention, the mounting seat includes a bottom plate and two vertical plates respectively arranged at both ends of the bottom plate;

[0021] The two vertical plates are parallel to each other, and are both provided with mounting holes, and the two mounting holes are coaxially arranged;

[0022] The wheel assembly further includes two slewing bearings respectively arranged in the mounting holes, and the two slewing bearings are sleeved at both ends of the rotating cylinder.

[0023] According to an embodiment of the present invention, the rotating cylinder includes a cylinder body connected to the transmission case at one end and a flange radially extending outward from the end where the cylinder body is connected to the transmission case;

[0024] The two slewing bearings are sleeved at both ends of the cylinder body;

[0025] The wheel assembly further includes a thrust bearing coaxial with the cylinder body, and the thrust bearing is clamped between the flange and the outer wall of the mounting seat.

[0026] According to an embodiment of the present invention, the wheel carrier further includes a mounting bracket disposed at one end of the transmission case close to the driving wheel.

[0027] The wheel assembly further includes a guide wheel mounted on the mounting bracket, and the axis of the guide wheel is parallel to the axis of the rotating cylinder.

[0028] Wherein, the axis of the driving wheel is perpendicular to the axis of the rotating cylinder.

[0029] According to an embodiment of the present invention, there are two mounting brackets, and the two mounting brackets are respectively disposed on opposite sides of the transmission case.

[0030] There are two guide wheels, and the two guide wheels are respectively disposed on the two mounting brackets.

[0031] According to an embodiment of the present invention, the driving wheel is a wheel, a gear, a sprocket or a timing pulley.

[0032] The present invention also provides a transport vehicle, which includes the wheel assembly as described above.

[0033] It can be seen from the above technical solutions that the advantages and positive effects of the wheel assembly of the present invention are as follows:

[0034] Install multiple wheel assemblies on the vehicle body of the transport vehicle. The driving wheels of the wheel assemblies on both sides are respectively abutted against the guide rails disposed on both sides of the vehicle body. Input torque from the rotating shaft, and the frictional force between the driving wheel and the guide rail can drive the vehicle body to move, so that the vehicle body can move smoothly on the guide rail. When the guide rail is vertically disposed, the frictional force between the driving wheel and the guide rail can also support the vehicle body, so that the vehicle body can crawl along the vertically disposed guide rail.

[0035] The driving wheel is mounted on the vehicle frame, and the vehicle frame is mounted on the rotating cylinder. Driving the rotating cylinder can change the traveling direction of the driving wheel. Since the rotating shaft and the rotating cylinder are coaxially disposed, there will be no mutual interference between the rotation of the rotating cylinder driving the driving wheel and the rolling of the driving wheel driven by the rotating shaft. At the same time, the rotating shaft can extend into the vehicle body and be driven to rotate by a driving device disposed inside the vehicle body, thereby driving the driving wheel to roll, without having to dispose the driving device on the wheel carrier, which makes the structure of the entire transport vehicle more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] By considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings, various objects, features and advantages of the present invention will become more apparent. The drawings are only illustrative diagrams of the present invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always represent the same or similar components. Among them:

[0037] Figure 1 is a perspective view of a transport vehicle shown according to an exemplary embodiment;

[0038] Figure 2 is a front view of a wheel assembly shown according to an exemplary embodiment;

[0039] Figure 3 is a full cross-sectional view of a wheel assembly shown according to an exemplary embodiment;

[0040] Figure 4 is an exploded view of a wheel assembly shown according to an exemplary embodiment;

[0041] Figure 5 is a left view of a wheel assembly shown according to an exemplary embodiment;

[0042] Figure 6 is a top view of a channel-shaped guide rail shown according to an exemplary embodiment;

[0043] Figure 7 is a cross-sectional view of a channel-shaped guide rail shown according to an exemplary embodiment. Detailed Embodiment

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures and thus their detailed description will be omitted.

[0045] As Figure 1 shown, Figure 1 a transport vehicle 100 in this embodiment is shown. This transport vehicle 100 is preferably an Automated Guided Vehicle.

[0046] The transport vehicle 100 includes a vehicle body 20 and a traveling mechanism 10. The traveling mechanism 10 is mounted on the vehicle body 20. The traveling mechanism 10 is used to drive the vehicle body 20 to travel along the guide rail. The vehicle body 20 can be configured as a generally rectangular structure. The vehicle body 20 includes a front end and a rear end opposite to the front end. The front end can be the front end of the vehicle body 20, and the rear end can be the rear end of the vehicle body 20.

[0047] The traveling mechanism 10 includes a plurality of wheel assemblies 1. The plurality of wheel assemblies 1 are respectively arranged on opposite sides of the vehicle body 20. The wheel assemblies 1 on both sides of the vehicle body 20 are respectively matched with two guide rails arranged on both sides of the transport vehicle 100 to lift the vehicle body 20 and travel along the guide rails. In this embodiment, four wheel assemblies 1 are provided, two wheel assemblies 1 are respectively arranged on opposite sides of the front end of the vehicle body 20, and the other two wheel assemblies 1 are respectively arranged on opposite sides of the rear end of the vehicle body 20. The four wheel assemblies 1 support the vehicle body 20 from positions close to the four corners of the vehicle body 20, which is more stable and reliable.

[0048] Referring to Figure 2 and Figure 3 , each wheel assembly 1 includes a wheel carrier 13, a driving wheel 14, a transmission mechanism 18, a rotating shaft 15, a rotating cylinder 12, and a mounting seat 11.

[0049] The mounting seat 11 is the base of the wheel assembly 1. The mounting seat 11 is used for fixedly connecting with the vehicle body 20. In this embodiment, the mounting seat 11 includes a bottom plate 111 and two side plates 112. The two side plates 112 are located on the same side of the bottom and are both perpendicular to the bottom plate 111. The two side plates 112 are parallel to each other. Mounting holes 113 are provided on both side plates 112, and the mounting holes 113 are circular through holes. The two mounting holes 113 are aligned with each other, that is, the two mounting holes 113 are coaxially arranged.

[0050] The rotating cylinder 12 includes a cylinder body 121. The cylinder body 121 is cylindrical. The diameter of the cylinder body 121 is smaller than the diameter of the mounting hole 113. The cylinder body 121 is arranged in the mounting hole 113. A rotational connection is formed between the cylinder body 121 and the mounting seat 11. In this embodiment, the wheel assembly 1 further includes two slewing bearings 22, and the inner rings of the two slewing bearings 22 are respectively sleeved on both ends of the cylinder body 121. The slewing bearing 22 can be a radial bearing 186 or a deep groove ball bearing. The outer rings of the two slewing bearings 22 are installed in the mounting holes 113 and form a fixed connection with the mounting holes 113. An interference fit can be formed between the outer ring of the slewing bearing 22 and the mounting hole 113. In this way, a rotational connection is formed between the rotating cylinder 12 and the mounting seat 11 through the slewing bearing 22. It can be understood that the slewing bearing 22 can also not be provided, and a rotational connection between the rotating cylinder 12 and the mounting seat 11 can also be achieved through a clearance fit between the mounting hole 113 and the rotating cylinder 12.

[0051] Referring to Figure 4, the wheel carrier 13 includes a transmission case 131. The transmission case 131 can be made of a metal material. An inner cavity is provided inside the transmission case 131. The outer shape of the transmission case 131 can be configured as a substantially hexahedron structure. The transmission case 131 can be configured as a straight bar. The transmission case 131 includes a first end and a second end opposite to the first end. The first end of the transmission case 131 is fixedly connected to the end of the rotating cylinder 12. The end of the first end of the transmission case 131 and the end of the rotating cylinder 12 can be welded, screw-connected or bolt-connected to each other. In this way, the wheel carrier 13 is mounted on the rotating cylinder 12, and the rotating cylinder 12 can drive the wheel carrier 13 to rotate around the axis of the rotating cylinder 12.

[0052] In this embodiment, the driving wheel is a vehicle wheel. The driving wheel 14 includes a roller body 142 and a first rotating shaft 141. The roller body 142 is circular, and a through hole is provided in the middle. The first rotating shaft 141 is cylindrical. The first rotating shaft 141 is coaxially arranged with the roller body 142. The driving wheel 14 is sleeved on the first rotating shaft 141 and forms a fixed connection with the first rotating shaft 141. The driving wheel 14 and the first rotating shaft 141 can be in interference fit. The first rotating shaft 141 is rotatably connected to the second end of the transmission case 131. The extending direction of the first rotating shaft 141 is perpendicular to the extending direction of the transmission case 131. In this embodiment, two bearings 19 are provided inside the second end of the transmission case 131, and the inner rings of the two bearings 19 are respectively sleeved on both ends of the first rotating shaft 141. Two bearing mounting holes 113 are respectively provided on the inner walls on both sides of the transmission case 131, and the outer rings of the two bearings 19 are respectively arranged in the two bearing mounting holes 113 and form a fixed connection with the mounting holes 113. After such setting, a rotating connection is formed between the driving wheel 14 and the transmission case 131. A part of the roller body 142 is accommodated inside the transmission case 131, and a part extends out from the second end of the transmission case 131.

[0053] The rotating shaft 15 is a straight bar. The rotating shaft 15 is coaxially arranged with the rotating cylinder 12. The diameter of the rotating shaft 15 is smaller than the inner hole diameter of the rotating shaft 15. The rotating shaft 15 penetrates through the rotating cylinder 12 and extends into the transmission case 131 from the first end of the transmission case 131. The rotating shaft 15 can rotate relative to the transmission case 131, and its rotation mode is to rotate around its own axis. In this embodiment, the wheel assembly 1 further includes a bearing 21 provided between the rotating shaft 15 and the rotating cylinder 12. The bearing 21 is provided inside the rotating cylinder 12, the inner ring of the bearing 21 is sleeved on the rotating shaft 15, and the outer ring of the bearing 21 abuts against the inner wall of the rotating cylinder 12. Two bearings 21 can be provided, and the two bearings 21 are respectively provided at both ends of the rotating cylinder 12. The axis of the rotating shaft 15 preferably passes through the center of the driving wheel 14. The rotating shaft 15 can be a spline shaft.

[0054] The transmission mechanism 18 is arranged inside the transmission case 131. The transmission mechanism 18 is respectively drivingly connected to the rotating shaft 15 and the driving wheel 14, and is used to transfer the torque conveyed by the rotating shaft 15 to the driving wheel 14 to drive the driving wheel 14 to roll. The transmission mechanism 18 includes a first bevel gear 181, a second rotating shaft 182 and a second bevel gear 183. The second rotating shaft 182 is parallel to the first rotating shaft 141. The second rotating shaft 182 is arranged at the first end of the transmission case 131. The second bevel gear 183 is sleeved on the second rotating shaft 182 and forms a fixed connection with the second rotating shaft 182. The second rotating shaft 182 is inserted into a shaft hole inside the transmission case 131 and is in clearance fit with the shaft hole, and the second rotating shaft 182 can rotate around its own axis in the shaft hole. The first bevel gear 181 is sleeved on one end of the rotating shaft 15 extending into the transmission case 131 and meshes with the second bevel gear 183, and the included angle between the two shafts is equal to 90°. The cooperation between the first bevel gear 181 and the second bevel gear 183 can change the direction of the input torque.

[0055] The second rotating shaft 182 is drivingly connected to the first rotating shaft 141. The connection between the second rotating shaft 182 and the first rotating shaft 141 can be belt drive, chain drive or gear drive. In this embodiment, gear drive is adopted between the second rotating shaft 182 and the first rotating shaft 141, and the transmission mechanism 18 further includes a first cylindrical gear 184, a second cylindrical gear 185, a third cylindrical gear 187 and a spindle 186. The first cylindrical gear 184 is sleeved on the first rotating shaft 141 and is fixedly connected to the first rotating shaft 141. The second cylindrical gear 185 is sleeved on the second rotating shaft 182 and is fixedly connected to the second rotating shaft 182. The spindle 186 is arranged between the first rotating shaft 141 and the second rotating shaft 182 and is parallel to the first rotating shaft 141. The third cylindrical gear 187 is sleeved on the spindle 186, and the third cylindrical gear 187 can rotate around the axis of the spindle 186. The spindle 186 is fixed on the inner wall of the transmission case 131, and the third cylindrical gear 187 is in clearance fit with the spindle 186, and the third cylindrical gear 187 can rotate around the spindle 186. The first cylindrical gear 184 meshes with the third cylindrical gear 187, and the third cylindrical gear 187 meshes with the second cylindrical gear 185.

[0056] In this embodiment, after the rotating shaft 15 rotates around its own axis under the drive of an external force, the rotating shaft 15 drives the first bevel gear 181 to rotate, the first bevel gear 181 drives the second rotating shaft 182 to rotate, the second rotating shaft 182 drives the second cylindrical gear 185 to rotate, the second cylindrical gear 185 drives the third cylindrical gear 187 to rotate, the third cylindrical gear 187 drives the first cylindrical gear 184 to rotate, and the first cylindrical gear 184 then drives the driving wheel 14 to roll. Thus, the torque input from the rotating shaft 15 can drive the driving wheel 14 to roll.

[0057] The driving wheel 14 is installed on the vehicle frame, and the vehicle frame is installed on the rotating cylinder 12. Driving the rotating cylinder 12 can change the traveling direction of the driving wheel 14. Since the rotating shaft 15 is coaxially arranged with the rotating cylinder 12, there will be no mutual interference between the rotation of the rotating cylinder 12 driving the driving wheel 14 to turn and the rotation of the rotating shaft 15 driving the driving wheel 14 to roll. At the same time, the rotating shaft 15 can extend into the interior of the vehicle body 20 and be driven to rotate by a driving device arranged inside the vehicle body 20, thereby driving the driving wheel 14 to roll, without having to arrange the driving device on the wheel frame 13, which makes the structure of the entire transport vehicle 100 more compact.

[0058] Install a plurality of wheel assemblies 1 on the vehicle body 20 of the transport vehicle 100. The driving wheels 14 of the wheel assemblies 1 on both sides are respectively abutted against the guide rails arranged on both sides of the vehicle body. Then, input torque from the rotating shaft 15, and the frictional force between the driving wheel 14 and the guide rail can drive the vehicle body to move, so that the vehicle body 20 can move smoothly on the guide rail. When the guide rail is arranged vertically, the frictional force between the driving wheel 14 and the guide rail can also support the vehicle body 20, enabling the vehicle body 20 to crawl along the vertically arranged guide rail.

[0059] Furthermore, the mandrel 186 is arranged between the first rotating shaft 141 and the second rotating shaft 182, and the axes of the first rotating shaft 141, the second rotating shaft 182, and the mandrel 186 are coplanar. In this way, the first cylindrical gear 184, the second cylindrical gear 185, and the third cylindrical gear 187 are arranged in a straight line in sequence, which makes the volume of the transmission case 131 smaller.

[0060] It can be understood that the axes of the first rotating shaft 141, the second rotating shaft 182, and the mandrel 186 may not be coplanar, and only the axes of these three need to be parallel to each other. The axes of the first rotating shaft 141, the second rotating shaft 182, and the mandrel 186 being coplanar is just an optimal implementation manner.

[0061] Furthermore, the middle part of the second rotating shaft 182 is rotatably connected to the transmission case 131. The second bevel gear 183 and the second cylindrical gear 185 are respectively arranged at both ends of the second rotating shaft 182, and the first bevel gear 181 is located between the second bevel gear 183 and the second cylindrical gear 185. After such an arrangement, the transmission mechanism 18 can be made more compact and smaller in volume. At the same time, the force on the second rotating shaft 182 is more reasonable.

[0062] It can be understood that the first bevel gear 181 may not be located between the second bevel gear 183 and the second cylindrical gear 185, as long as the first bevel gear 181 can be meshed with the second bevel gear 183. The first bevel gear 181 being located between the second bevel gear 183 and the second cylindrical gear 185 is an optimal implementation manner.

[0063] Further, the rotating cylinder 12 further includes a flange 122. The flange 122 is disposed at one end of the cylinder body 121 connected to the transmission case 131, and the flange 122 extends radially outward from the end of the cylinder body 121. The flange 122 is annular. The outer diameter of the flange 122 is greater than the inner diameter of the mounting hole 113. The wheel assembly 1 further includes a thrust bearing 16. The thrust bearing 16 is coaxially disposed with the cylinder body 121. The thrust bearing 16 is clamped between the flange 122 and the outer wall of the mounting seat 11. In this way, the thrust bearing 16 can bear the axial load transmitted from the wheel carrier 13 to prevent the slewing bearing 22 from bearing an excessive axial load. Further still, an annular notch is formed by inward depression on the side of the outer edge of the flange 122 close to the mounting seat 11, and the thrust bearing 16 is installed in the annular notch. In this way, the thrust bearing 16 is limited in position to prevent the thrust bearing 16 from moving randomly.

[0064] Further, the wheel carrier 13 further includes a mounting bracket 132. The mounting bracket 132 can be configured as a triangle. The mounting bracket 132 is disposed on the side surface of the second end of the transmission case 131. The mounting bracket 132 is located in the radial direction of the driving wheel 14. The wheel assembly further includes a guide wheel 17. The guide wheel 17 is disposed on the mounting bracket 132, and the guide wheel 17 can roll around its own axis. The axis of the guide wheel 17 is perpendicular to the axis of the rotating cylinder 12, and the axis of the driving wheel 14 is parallel to the axis of the rotating cylinder 12.

[0065] Referring to Figure 6 、 7 This wheel assembly 1 is particularly suitable for traveling in the grooved guide rail 3. A strip groove 31 is provided on the grooved guide rail 3, and the strip groove 31 can be a straight strip groove 31. Both the guide wheel 17 and the driving wheel 14 can extend into the strip groove 31, and the driving wheel 14 always abuts against the bottom wall 311 of the strip groove 31. When the strip groove 31 extends in the horizontal direction, the guide wheel 17 hangs on the side wall 312 of the strip groove 31 and bears the vehicle body 20, and the driving wheel 14 rolls on the bottom wall 311 of the strip groove 31 to drive the vehicle body 20 to travel along the strip groove 31, so that the transport vehicle 100 can travel smoothly along the horizontal strip groove 31. When the strip groove 31 is vertically arranged, the frictional force between the driving wheel 14 and the bottom wall 311 of the strip groove 31 bears the weight of the vehicle body 20. At the same time, the guide wheel 17 interacts with the side wall 312 of the strip groove 31 to guide the driving wheel 14 to move along the strip groove 31, preventing the driving wheel 14 from rubbing against the side wall 312 of the strip groove 31, and the transport vehicle 100 can travel smoothly along the vertical strip groove 31.

[0066] Of course, the driving wheel 14 can also be a sprocket. After a chain extending along the strip groove 31 is fixedly installed inside the strip groove 31, the driving wheel 14 meshes with the chain, and after the driving wheel 14 rotates, it interacts with the chain and rolls along the chain.

[0067] The driving wheel 14 can also be a gear. A rack extending along the extension direction of the strip groove 31 is fixedly installed inside the strip groove 31, or a plurality of teeth arranged side by side along the extension direction of the strip groove 31 are provided on the bottom wall of the strip groove 31. In this way, when the driving wheel 14 meshes with the rack or the teeth at the bottom of the strip groove 31, the driving wheel 14 can move along the strip groove 31.

[0068] The driving wheel 14 can also be a timing pulley. A timing belt is fixedly installed inside the strip groove 31, and the timing belt extends along the extension direction of the strip groove 31. After the timing belt meshes with the driving wheel 14, the driving wheel 14 can move along the timing belt.

[0069] When the driving wheel 14 is a gear, a sprocket or a timing pulley and meshes with the corresponding structure in the strip groove 31, the driving wheel 14 will not slip in the strip groove 31, and the driving wheel 14 can carry a greater load.

[0070] Furthermore, there are two mounting brackets 132, and the two mounting brackets 132 are respectively arranged on opposite sides of the second end of the transmission case 131. Refer to Figure 5 , there are two guide wheels 17. The two guide wheels 17 are respectively arranged on the two mounting brackets 132. The two guide wheels 17 are respectively located in front of and behind the driving wheel 14.

[0071] Setting the driving wheel 14 between the two guide wheels 17 can completely prevent the driving wheel 14 from rubbing against the side wall 312 of the strip groove 31. At the same time, when the two guide wheels 17 are hung on the side wall 312 of the strip groove 31, the deflection torques applied by the two guide wheels 17 to the wheel frame 13 cancel each other out, and the force on the wheel frame 13 is more reasonable.

[0072] Although the present invention has been disclosed with reference to certain embodiments, various modifications and variations can be made to the described embodiments without departing from the scope and scope of the present invention. Therefore, it should be understood that the present invention is not limited to the described embodiments, and its protection scope should be defined by the content of the appended claims and their equivalent structures and solutions.

Claims

1. A wheel assembly, characterized in that, Comprising: A mounting base (11); A rotating cylinder (12) rotatably connected to the mounting base (11), the rotating cylinder (12) being capable of rotating about its axis; A wheel carrier (13), including a transmission case (131), the transmission case (131) including a first end connected to an end of the rotating cylinder (12) and a second end opposite to the first end, the transmission case (131) being made of a metallic material; A driving wheel (14) provided on the second end; A rotating shaft (15) passing through the rotating cylinder (12) and coaxially arranged with the rotating cylinder (12); A transmission mechanism (18) provided in the transmission case (131), being respectively in transmission connection with the rotating shaft (15) and the driving wheel (14); The wheel carrier (13) further includes a mounting bracket (132) provided at an end of the transmission case (131) close to the driving wheel (14); The wheel assembly (1) further includes a guide wheel (17) mounted on the mounting bracket (132), an axis of the guide wheel (17) being parallel to an axis of the rotating cylinder (12); Wherein, an axis of the driving wheel (14) is perpendicular to an axis of the rotating cylinder (12); The guide wheel (17) and the driving wheel (14) are used for rolling cooperation with a grooved track (3), and the driving wheel (14) abuts against a bottom wall (311) of the grooved track (3).

2. The wheel assembly according to claim 1, wherein, A first rotating shaft (141) is provided on the driving wheel (14), the first rotating shaft (141) being rotatably connected to the transmission case (131); The transmission mechanism (18) includes A first bevel gear (181) sleeved on the rotating shaft (15); A second rotating shaft (182) rotatably connected to the transmission case (131) and parallel to the first rotating shaft (141); A second bevel gear (183) sleeved on the second rotating shaft (182), meshing with the first bevel gear (181); Wherein, the second rotating shaft (182) is in transmission connection with the first rotating shaft (141).

3. The wheel assembly according to claim 2, wherein, The transmission mechanism (18) further includes A first cylindrical gear (184) sleeved on the first rotating shaft (141); A second cylindrical gear (185) sleeved on the second rotating shaft (182); A mandrel (186) mounted on an inner wall of the transmission case (131) and parallel to the first rotating shaft (141); A third cylindrical gear (187) sleeved on the mandrel (186) and capable of rotating about the mandrel (186), the third cylindrical gear (187) meshing with the first cylindrical gear (184) and the second cylindrical gear (185) respectively.

4. The wheel assembly according to claim 3, characterized in that The mandrel (186) is provided between the first rotating shaft (141) and the second rotating shaft (182), and axes of the first rotating shaft (141), the second rotating shaft (182) and the mandrel (186) are coplanar.

5. The wheel assembly according to claim 3 or 4, characterized in that, The middle part of the second rotating shaft (182) is rotatably connected to the transmission case (131). The second bevel gear (183) and the second cylindrical gear (185) are respectively arranged at two ends of the second rotating shaft (182), and the first bevel gear (181) is located between the second bevel gear (183) and the second cylindrical gear (185).

6. The wheel assembly according to any one of claims 1 to 4, characterized in that The mounting seat (11) includes a bottom plate (111) and two vertical plates (112) respectively arranged at two ends of the bottom plate (111); The two vertical plates (112) are parallel to each other and are both provided with mounting holes (113), and the two mounting holes (113) are coaxially arranged; The wheel assembly (1) further includes two slewing bearings (22) respectively arranged in the mounting holes (113), and the two slewing bearings (22) are sleeved on two ends of the rotating cylinder (12).

7. The wheel assembly according to claim 6, wherein, The rotating cylinder (12) includes a cylinder body (121) with one end connected to the transmission case (131) and a flange (122) radially extending outward from the end where the cylinder body (121) is connected to the transmission case (131); The two slewing bearings (22) are sleeved on two ends of the cylinder body (121); The wheel assembly (1) further includes a thrust bearing (16) coaxial with the cylinder body (121), and the thrust bearing (16) is clamped between the flange (122) and the outer wall of the mounting seat (11).

8. The wheel assembly according to claim 1, characterized in that, There are two mounting brackets (132), and the two mounting brackets (132) are respectively arranged on opposite sides of the transmission case (131); There are two guide wheels (17), and the two guide wheels (17) are respectively arranged on the two mounting brackets (132).

9. The wheel assembly according to any one of claims 1 to 4, characterized in that The wheel assembly (1) further includes a bearing (21), the outer ring of the bearing (21) abuts against the inner wall of the rotating cylinder (12), and the inner ring of the bearing (21) is sleeved on the rotating shaft (15).

10. The wheel assembly according to any one of claims 1 to 4, characterized in that, The driving wheel (14) is a wheel, a gear, a sprocket or a timing pulley.

11. A transport vehicle, characterized in that, It includes the wheel assembly (1) according to any one of claims 1 to 10.

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