CN207711710U - a universal wheel - Google Patents

Abstract

The utility model discloses a universal wheel, which comprises a wheel hub and rollers, radial flanges are arranged on the peripheral surface of the wheel hub, and a plurality of mounting seats parallel to the radial direction of the wheel hub are evenly distributed on the peripheral surface of the bracket assembly. Each mounting seat is formed by the discrete first mounting seat and the second mounting seat being fastened together. Both ends of each first mounting seat are respectively provided with a first arc-shaped groove on the same circumference, and each second mounting seat The two ends of each are respectively provided with a second arc-shaped groove on the same circumference; the end of the roller is placed in the second arc-shaped groove, and after the first mounting seat is closed and fastened to the second mounting seat, the end of the roller It is movably assembled into a circular hole surrounded by the first arc-shaped groove on the first mounting base and the second arc-shaped groove on the second mounting base. The utility model has the advantages of reducing assembly difficulty and improving assembly precision.

Description

a universal wheel

technical field

The utility model relates to a universal wheel suitable for small transportation tools such as wheelchairs and carts.

Background technique

The wheelchair is an important tool for rehabilitation. It is not only a means of transportation for the physically disabled, but more importantly, it enables them to perform physical exercises and participate in social activities with the help of wheelchairs. Therefore, people have higher and higher requirements for the flexibility of wheelchairs.

The traditional universal wheel is driven by external force, and the direction of the wheel needs to be changed to move, and when the external force changes the direction of movement, the wheel needs a process of adjusting the direction of the wheel, which is not flexible to use. Moreover, the direction in which the wheel is subjected to load deviates from the center of the wheel, causing the wheel frame to generate an eccentric moment, making the operation unstable and affecting the service life.

For this reason, the open number is that CN201061980Y discloses a kind of universal electric wheel, and the large waist drum roller part, the small waist drum roller part and the roller support are alternately installed and distributed on the whole wheel rim of the wheel, and there are four wheels at the bottom of the roller support. The four screw holes can be matched with the small holes on the raised rim of the hub-type brushless DC motor, and the bolts fix the large and small waist drum roller parts and roller brackets on the motor rim, which constitutes a universal walking electric wheels.

The utility model patent with the publication number CN204352052U discloses an electric wheelchair. As shown in Figure 1, the front wheel 2 of the electric wheelchair is an omnidirectional wheel, including a wheel hub 2-1, a driven wheel 2-2, and a wheel hub 2-2. 1 Two rows of "Y"-shaped protrusions designed in one piece, any row of "Y"-shaped protrusions is composed of multiple "Y"-shaped protrusions 2-3 distributed on the same circumference, two rows of "Y"-shaped protrusions are arranged staggeredly, driven wheels 2-2 is installed in the hole on the "Y"-shaped protrusion 2-3, and a driven wheel 2-2 is correspondingly arranged between two adjacent "Y"-shaped protrusions 2-3, and a row of "Y"-shaped protrusions Any "Y"-shaped protrusion on the top is directly between two "Y"-shaped protrusions in another row of "Y"-shaped protrusions.

For the wheel of the above structure, although it can realize the steering in any direction, yet, in CN201061980Y, the protruding rim of the connecting bracket is integrally formed with the hub type brushless DC motor; 2-3 and the hub 2-1 are integrally formed, and these integrally formed structures will increase manufacturing difficulty and increase manufacturing cost. For the patent in CN204352052U, since the spacing between two adjacent Y-shaped protrusions is fixed, when installing, when the two ends of the driven wheel 2-2 are respectively inserted into the through holes provided at the ends of the Y-shaped protrusions , the driven wheel 2-2 needs to be deformed to be assembled. Such a structure is not only difficult to install, but also reduces the accuracy of the installation due to the deformation of the driven wheel.

Contents of the invention

The purpose of the utility model is to provide a universal wheel which reduces assembly difficulty and improves assembly precision.

The technical scheme for solving the above technical problems is as follows: S

A universal wheel, comprising a hub and rollers, a radial flange is provided on the peripheral surface of the hub, and a bracket assembly fixed on the flange, a plurality of parallel rollers are evenly distributed on the peripheral surface of the bracket assembly The mounting seat in the radial direction of the hub, each mounting seat is formed by the discrete first mounting seat and the second mounting seat being fastened together, and the two ends of each first mounting seat are respectively provided with a first arc located on the same circumference. shaped slots, and the two ends of each second mounting seat are respectively provided with second arc-shaped slots on the same circumference;

The end of the roller is placed in the first arc-shaped groove, and after the second mounting seat is closed to the first mounting seat and fastened, the end of the roller is movably assembled into the first arc-shaped groove on the first mounting seat and the second arc-shaped groove on the second mounting seat; or the end of the roller is placed in the second arc-shaped groove, and after the first mounting seat is closed to the second mounting seat and fastened, the roller The end part of is movably fitted into the circular hole surrounded by the first arc-shaped groove on the first mounting base and the second arc-shaped groove on the second mounting base.

Manufacturing the bracket assembly and the wheel hub separately helps to reduce manufacturing difficulty, and different materials can be used to manufacture the wheel hub, bracket assembly, and mounting seat, which is beneficial to reduce manufacturing costs, and the precision is easy to control. When assembling,

Place the end of the roller in the first arc-shaped groove, and after the second mounting seat is fastened close to the first mounting seat, the end of the roller is movably assembled to the first arc-shaped groove formed by the first mounting seat. In the circular hole surrounded by the groove and the second arc-shaped groove on the second mounting seat, this structure not only makes it easier to change the roller when assembling, but also avoids the deformation of the roller during assembly, so that the accuracy after assembly is guaranteed . Therefore, the utility model has the advantages that the product has no eccentric moment during use, becomes more stable, and has a long service life.

Description of drawings

Fig. 1 is the schematic diagram of the front wheel in the electric wheelchair in the prior art;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 4 is the schematic cross-sectional structure diagram of the utility model after hiding the end cover, the shaft and the DC brushless motor;

Fig. 5 is a schematic diagram after hiding the hub on the basis of Fig. 4;

Fig. 6 is the schematic diagram of wheel hub;

Fig. 7 is the schematic diagram of the first bracket;

Fig. 8 is the schematic diagram of the second bracket;

Figure 9 is a diagram showing the relationship between the arc radius of the mounting seat and the arc radius of the roller;

Fig. 10 is a schematic diagram after an end cover, a shaft and a DC brushless motor are assembled in the hub;

10 is a wheel hub, 11 is a flange, 11a is a mounting hole, 12 is a space, and 13 is an interval space;

20 is a bracket assembly, 20a is an assembly groove, 21 is a first bracket, 21a is a protective edge, 22 is a second bracket, 22a is an axial extension, 22b is a rib, 23 is a first mounting seat, 23a is a first Arc groove, 24 is the second seat, 24a is the second arc groove, and 25 is the first step;

30 is a roller, and 31 is a bearing;

40 is an end cover, 41 is a shaft, 42 is a DC brushless motor, and 43 is a gear transmission mechanism.

detailed description

As shown in Figures 2 to 5, a universal wheel of the present invention includes a hub 10, a bracket assembly 20 and a drum-shaped roller 30, and each part and the relationship between them will be described in detail below:

As shown in Figures 2 to 6, radial flanges 11 are arranged on the peripheral surface of the hub 10, and two groups of flanges 11 are preferably used, and each group can be formed by a continuous annular flange, or can be It consists of a plurality of discrete flanges, and in this embodiment, each group preferably adopts an annular flange 11 . The flange 11 is provided with a plurality of axial mounting holes 11a, and these mounting holes 11a are used for mounting the bracket assembly.

In one or more embodiments, preferably, the distance between the end of the flange 11 close to the axial end surface of the hub 10 and the axial end surface of the hub 10 is greater than 1mm, so as to form a space 12 for assembling a part of the bracket assembly, so as to avoid After the bracket assembly 20 is assembled with the hub 10, the bracket assembly 20 protrudes to the axial outside of the axial end surface of the hub 10. If end caps are installed at both ends of the hub, the interference of the bracket assembly 20 on the assembly of the end caps can be avoided. The space 13 between the two flanges 11 on the hub 10 forms a space for assembling a part of the bracket assembly.

As shown in Figures 2 to 8, the bracket assembly 20 is fixed on the flange 11, and the bracket assembly 20 is provided with an assembly groove 20a for accommodating the flange 11, and the flange 11 is inserted into the assembly groove 20a In the middle, the bracket assembly 20 and the flange are fastened together by fasteners, and the fasteners are preferably screws.

As shown in FIG. 4 and FIG. 5 , in one or more embodiments, the bracket assembly 20 is formed by fastening discrete first brackets 21 and second brackets 22 together, the first bracket 21 and the second bracket 22 Both are ring-shaped, the first bracket 21 and the second bracket 22 are sleeved on the hub 10 respectively, the second bracket 22 is connected with the mounting holes on the flange 11 by screws, so that the second bracket 22 and the flange 11 are fastened as One.

As shown in Figures 4 and 5, since the first bracket 21 and the second bracket 22 are respectively sleeved on the hub 10, the first bracket 21 is installed at the space 12, and the second bracket 22 is installed at the space 13, for As far as the first bracket 21 installed in the space 12 is concerned, the structure of a whole ring can be adopted, and a structure of a ring formed by combining a plurality of arc-shaped brackets can also be adopted. In this embodiment, the first bracket 21 preferably adopts Integral ring structure.

As shown in Fig. 4 and Fig. 5, for the second bracket 22 installed in the space 13, since there are two flanges 11 in this embodiment, it is necessary to set the second bracket 21 to at least two Each arc-shaped bracket is composed of two arc-shaped brackets, so that the second bracket can be installed in the interval space 13. Each arc-shaped bracket preferably adopts a semicircular structure. Of course, the arc-shaped brackets can also be other than semi-circular, as long as these arc-shaped brackets are connected end to end to form a ring. The second support 22 can be, for example, when there are 3 arc supports, the radian of each arc support is 120 degrees, and when there are 2 arc supports, the arc of one of them is less than 180 degrees, while the other The radian of an arc-shaped bracket is greater than 180 degrees.

As shown in Figure 4 and Figure 5, in the present embodiment, the flanges 11 on the peripheral surface of the hub are two groups, each group of flanges 11 is equipped with the bracket assembly 20, and each group of bracket assemblies 20 One end of the arc bracket is abutted against the flange 11 on which the bracket assembly is installed, and the other end of the arc bracket in each group of bracket assemblies 20 is provided with an axial extension 22a, wherein the arc bracket in one group of bracket assemblies 20 The axial extension portion 22a abuts against the axial extension portion of the arc-shaped bracket in another group of bracket components to form an axial stop. Through such a structural arrangement, the second bracket 22 is installed in the space 13, and one end of the two second brackets 22 can be axially limited by the flange 11, and the other ends of the two second brackets 22 Limiting each other makes the stability of the second bracket 22 better after assembly.

As shown in Figures 2 to 8, a plurality of mounting seats parallel to the radial direction of the hub are evenly distributed on the peripheral surface of the bracket assembly 20, and each mounting seat is tightly closed by a discrete first mounting seat 23 and a second mounting seat 24. Formed after solidification, one end of the first mounting base 23 is located on the circumference of the first bracket 21 , and one end of the second mounting base 24 is located on the circumference of the second bracket 22 . The first mounting base 23 is integrally formed with the first bracket 21, the second mounting base 24 is integrally formed with the second bracket 22, and the first mounting base 23 is fastened with the second mounting base 24 by screws, so that the first bracket 21 and the second mounting base 24 are fastened together. The second bracket 22 is fixed as a whole.

As shown in Figures 2 to 8, each of the first mounts 23 extends along the radial direction of the first bracket 21 to form a first step 25 on the axial end surface of the first bracket 21, and the first step 25 not only increases The strength of the first bracket 21, and each first step 25 preferentially forms an annular step in an end-to-end state, when the first bracket 21 draws close to the second bracket 22, the axial end surface of the second bracket 22 is aligned with the first bracket 22. After the axial end surfaces of the steps 25 abut against each other, the assembly groove 20 a is formed between the axial end surfaces of the first bracket 21 , the axial end surfaces of the second bracket 22 and the first step 25 .

As shown in Figure 2 to Figure 8, the universal wheel in the utility model, in the process of use, in addition to rotating in the circumferential direction, will also rotate in other arbitrary directions, therefore, the force of the universal wheel is in any direction force. In the present utility model, the bracket assembly 20 and the hub 10 are manufactured separately and combined into one, therefore, the strength of the bracket assembly 20 will be reduced compared with the bracket assembly directly formed on the hub 10, thus, in one or In many embodiments, in order to increase the strength of the bracket assembly 20, a rib 22b is provided on the axially extending portion 22a, and one end of the rib 22b is fixed to the second mount 24, and the rib 22b is connected to the second mount 24. The axial end faces are connected, so that when the universal wheel is subjected to non-circumferential forces, these forces are resisted under the support of the ribs 22b, so that the second mounting seat 24 can be prevented from breaking.

The first mounting seat 23 and the second mounting seat 24 are preferably fastened with screws, and the two ends of each first mounting seat 23 are respectively provided with a first arc-shaped groove 23a on the same circumference, and the two ends of each second mounting seat 24 The ends are respectively provided with second arc-shaped grooves 24a located on the same circumference. The shape of the roller 30 is preferably drum-shaped, and the end of the roller 30 is placed in the second arc-shaped groove. After the first mounting seat 23 is closed to the second mounting seat 24 and fastened, the end of the roller 30 is moved. Fit into the circular hole surrounded by the first arc-shaped groove 23 a on the first mount 23 and the second arc-shaped groove 24 on the second mount 24 .

In the above-mentioned assembly method, when the bracket assembly 20 is installed, the flange 11 of the second bracket 22 is fastened first, and the end of the roller 30 is placed in the second arc-shaped groove 24a, and then the first bracket 21 is placed toward the second bracket 22. Finally, the first mounting seat and the second mounting seat are fastened, and finally the end of the roller 30 is movably assembled to the first arc-shaped groove 23a on the first mounting seat 23 and the second mounting seat 24 in the circular hole surrounded by the second arc groove 24. In this way, a plurality of rollers 30 are arranged along the circumference of the bracket assembly 20 , the rollers 30 can move integrally with the hub 10 , and the rollers 30 can also rotate on the mounting seat to adapt to the movement when changing any direction.

The arc of the first arc groove 23a and the second arc groove 24a can be 180 degrees, or: the arc of the first arc groove 23a is less than 180 degrees, and the arc of the second arc groove 24a is greater than 180 degrees. Can be: the arc of the first arc-shaped groove 23a is greater than 180 degrees, and the arc of the second arc-shaped groove 24a is less than 180 degrees. In short, the sum of the two arcs is 360 degrees so that the first arc-shaped groove 23a It is enough to form a circular hole together with the second arc-shaped groove 24a.

The end of the roller 30 is provided with a bearing 31. After the first mounting seat 23 and the second mounting seat 24 are brought together and fastened, the bearing 31 is assembled into the first arc groove 23a and the second mounting seat 23 on the first mounting seat 23. In the circular hole surrounded by the second arc-shaped groove 24a on the mounting base 24. By installing the bearings 31 at both ends of the roller 30, the friction force between the roller 30 and the mounting seat can be reduced, so that the roller 30 is more flexible when it rotates.

In this embodiment, since the flanges 11 on the peripheral surface of the hub are in two groups, the bracket assembly 20 is installed on each group of flanges 11, and the rollers 30 on the mounting seats of the two groups of bracket assemblies 20 are in the form of Arranged in a staggered and complementary manner, the central points of the arc-shaped surfaces of the three rollers 30 arranged in a staggered and complementary manner are arranged in an isosceles triangle, and among the three rollers, the two rollers on the mounting seats of the same row of bracket assemblies 20 30 is located on the base of the isosceles triangle. Here, the three rollers 30 on the mounting bases of the two groups of bracket assemblies 20 are arranged in an isosceles triangle, which is arranged in an isosceles triangle. The directional wheel keeps a stable state during operation. If the three rollers 30 arranged alternately and complementary to each other on the mounting bases of the two groups of bracket assemblies 20 are arranged in a non-isosceles triangle, the directional wheel will be in the running process. It will be unstable, especially when there are only two rollers landing on the ground when the universal wheel is turning, the universal wheel will be unbalanced. If the universal wheel of the utility model is applied to a wheelchair, the wheelchair will also appear slightly The bumps make people in wheelchairs feel uncomfortable.

As shown in Figures 2 to 9, the outer top ends of the first mounting seat 23 and the second mounting seat 24 are in the shape of an arc concentric with the hub 10, the radius of the arc is r, and the arc surface of the drum-shaped roller 30 The radius of the concentric circle with the hub is R1, and the value of r/R1 is in the range of 0.96-0.98. Set the value of r/R1 in the range of 0.96 to 0.98, the stability and service life of the universal wheel are the best, if it is less than this value range, the supporting force of the bracket assembly 20 and the mounting seat to the roller 30 is poor, and the roller 30 Its own force is relatively large, which will affect the life of the roller; if it is greater than this value range, although the supporting force of the support assembly 20 and the mounting seat to the roller is good, the ability of the universal wheel to cross obstacles will be reduced, and the support assembly will 20 and the mount creates resistance.

As shown in Figure 2, Figure 3 and Figure 10, it also includes an end cover 40, a shaft 41, a DC brushless motor 42, and a gear transmission mechanism 43, the hub 10 is hollow and has openings at both ends, and the inner wall of the hub 10 is provided with There is a ring gear, and the end cover 40 is fixed on the axial end surface of the hub 10, and an assembly hole is arranged on the axial end surface of the hub 10. After the end cover 40 is covered on the axial end surface of the hub 10, the end cover is connected to the hub 10 by screws. The hub 10 is fastened as one. The DC brushless motor 42 is located inside the hub 10. After one end of the shaft 41 passes through the center of the DC brushless motor 42, the two ends of the shaft 41 are respectively supported on the end cover 40, and the gear transmission mechanism is arranged on the output of the DC brushless motor 42. At the end, the gear transmission mechanism 43 meshes with the ring gear on the inner wall of the hub 10 .

The utility model is not limited to the above-mentioned embodiments, for example, the end of the roller 30 is placed in the first arc-shaped groove 23a, and after the second mounting seat 24 is closed and fastened to the first mounting seat 23, the end of the roller 30 It is movably fitted into a circular hole surrounded by the first arc-shaped groove 23 a on the first mount 23 and the second arc-shaped groove 24 a on the second mount 24 . In this assembly method, when the bracket assembly 20 is installed, the first bracket 21 and the flange 11 are first fastened, and the end of the roller 30 is placed in the first arc-shaped groove 23a, and then the second bracket 22 is placed toward the first The brackets 21 are brought together, and finally, the first mounting seat and the second mounting seat are fastened, and finally the end of the roller 30 is movably assembled into the first arc-shaped groove 23a and the second mounting seat 23 on the first mounting seat 23. In the circular hole surrounded by the second arc-shaped groove 24 on the mounting base 24 .

An arc-shaped protective edge 21a surrounding the outside of the roller 30 is provided between two adjacent first mounting seats 23. The protective edge 21a is integrally formed with the first bracket 21 and the first mounting seat 23. The 30 roller 2 and the protective edge There are gaps between the edges 5.

Claims (11)

1. A universal wheel, comprising a hub and a roller, characterized in that, the peripheral surface of the hub is provided with a radial flange, and also includes a bracket assembly fixed on the flange, the peripheral surface of the bracket assembly There are a plurality of mounting seats parallel to the radial direction of the hub, and each mounting seat is formed by closing and fastening discrete first mounting seats and second mounting seats. The first arc-shaped groove on the circumference, and the two ends of each second mounting seat are respectively provided with a second arc-shaped groove on the same circumference; The end of the roller is placed in the first arc-shaped groove, and after the second mounting seat is closed to the first mounting seat and fastened, the end of the roller is movably assembled into the first arc-shaped groove on the first mounting seat and the second arc-shaped groove on the second mounting seat; or the end of the roller is placed in the second arc-shaped groove, and after the first mounting seat is closed to the second mounting seat and fastened, the roller The end part of is movably fitted into the circular hole surrounded by the first arc-shaped groove on the first mounting base and the second arc-shaped groove on the second mounting base. 2. The universal wheel according to claim 1, characterized in that, the bracket assembly is provided with an assembly groove for accommodating the flange, and after the flange is inserted into the assembly groove, the bracket assembly and the flange pass through Fasteners are fastened together. 3. The universal wheel according to claim 2, characterized in that, the bracket assembly is formed of discrete first brackets and second brackets that are fastened together and then fastened together, and the first mounting seat is located on the circumference of the first bracket , the second mounting seat is located on the circumference of the second bracket. 4. The universal wheel according to claim 3, wherein each of the first mounts extends along the radial direction of the first bracket to form a first step on the axial end surface of the first bracket, and the first bracket When approaching the second bracket, after the axial end surface of the second bracket and the axial end surface of the first step are pushed against each other, the axial end surface of the first bracket, the axial end surface of the second bracket and the first step are enclosed. into the assembly slot. 5 . The universal wheel according to claim 3 , wherein the first bracket and the second bracket are ring-shaped, and the first bracket and the second bracket are sleeved on the hub respectively. 6. The universal wheel according to claim 5, characterized in that, the second bracket is composed of at least two arc-shaped brackets. 7. The universal wheel according to claim 6, wherein there are two groups of flanges on the peripheral surface of the hub, each group of flanges is equipped with the bracket assembly, and each group of bracket assemblies One end of the arc-shaped support is against the flange on which the support assembly is installed, and the other end of the arc-shaped support in each set of support assemblies is provided with an axial extension, wherein the axial extension of the arc-shaped support in one set of support assemblies The axial extensions of the arc-shaped brackets in the bracket assembly of the other set of brackets butt against each other so as to form axial stops. 8 . The universal wheel according to claim 7 , wherein a rib is provided on the axially extending portion, and one end of the rib is fixed to the second mounting seat. 9. The universal wheel according to claim 1, characterized in that, the ends of the rollers are provided with bearings, and after the first mounting seat and the second mounting seat are brought together and fastened, the bearing is assembled to the first mounting seat In the circular hole surrounded by the first arc-shaped groove on the top and the second arc-shaped groove on the second mount. 10. The universal wheel according to claim 1, further comprising an end cover, a shaft, a DC brushless motor, and a gear transmission mechanism, the hub is hollow and has openings at both ends, and the inner wall of the hub is provided with Ring gear, the end cover is fixed on the axial end face of the hub, the DC brushless motor is located inside the hub, one end of the shaft passes through the center of the DC brushless motor, and the two ends of the shaft are respectively supported on the end cover, the gear transmission mechanism is set At the output end of the brushless DC motor, the gear transmission mechanism meshes with the ring gear on the inner wall of the hub. 11. The universal wheel according to claim 1, characterized in that, the bracket assembly is formed of discrete first brackets and second brackets that are fastened together and then fastened, and the first mounting seat is located on the circumference of the first bracket , the second mounting seat is located on the circumference of the second bracket.