WO2019080443A1

WO2019080443A1 - Universal wheel

Info

Publication number: WO2019080443A1
Application number: PCT/CN2018/080427
Authority: WO
Inventors: 陈小平
Original assignee: 常州市吉庆机电有限公司
Priority date: 2017-04-14
Filing date: 2018-03-26
Publication date: 2019-05-02
Also published as: CN107753197A; WO2019080444A1; CN207711710U; CN107811775A; CN107804117A; CN106985608A; JP3216935U; CN107753197B; DE202018101986U1

Abstract

Disclosed is a universal wheel, comprising a hub (10) and rollers (30), wherein radial flanges (11) are provided on a circumferential surface of the hub (10), a support component (20) is fixed on the flanges (11), a plurality of mounts parallel to the radial direction of the hub (10) are evenly distributed on the circumferential surface of the support component (20), each mount is formed of first mounts (23) and second mounts (24) discretely getting close to each other and being fastened, two ends of each first mount (23) are respectively provided with a first arc groove (23a) located on the same circumference, and two ends of each second mount (24) are respectively provided with a second arc groove (24a) located on the same circumference; and the ends of the rollers (30) are placed in the second arc grooves (24a), and after the first mounts (23) become close and are fastened to the second mounts (24), the ends of the rollers (30) are movably fitted into circular holes enclosed by the first arc grooves (23a) in the first mounts (23) and the second arc grooves (24a) in the second mounts (24). The universal wheel has the advantages of reducing the mounting difficulty and increasing the mounting accuracy.

Description

a universal wheel

Technical field

The present invention relates to a universal wheel suitable for use in small vehicles such as wheelchairs or carts.

Background technique

Wheelchairs are an important tool for rehabilitation. They are not only a means of transportation for physically handicapped people, but more importantly, they enable them to exercise and participate in social activities by means of wheelchairs. Therefore, people have more and more flexibility in wheelchairs.

The traditional universal wheel is driven by external force, and the direction of the wheel needs to be changed to move. When the external force changes the direction of motion, the wheel needs to have a process of adjusting the direction of the wheel, which is inflexible. Moreover, the direction of the wheel is offset from the center of the wheel, which causes the wheel carrier to generate an eccentric moment, which is unstable and affects the service life.

To this end, the disclosed CN201061980Y discloses a universal electric wheel in which a large waist drum roller component, a small waist drum roller component and a roller bracket are alternately mounted on the entire rim of the wheel, and four in the lower part of the roller bracket. The screw holes can be matched with the small holes on the convex rim of the hub type DC brushless motor, and the size drum roller member and the roller bracket are fixed on the motor rim by bolts, which constitutes a universal walking. Electric wheel.

The utility model publication CN204352052U discloses an electric wheelchair. As shown in FIG. 1, the front wheel 2 of the electric wheelchair is an omnidirectional wheel, including a hub 2-1, a driven wheel 2-2, and a hub 2-2. 1 integral design of two rows of "Y"-shaped protrusions, any row of "Y"-shaped protrusions consists of a plurality of "Y"-shaped protrusions 2-3 distributed on the same circumference, two rows of "Y"-shaped protrusions staggered, driven wheels 2-2 is installed in the hole opened in the "Y"-shaped protrusion 2-3, and a driven wheel 2-2 is arranged correspondingly between two adjacent "Y"-shaped protrusions 2-3, and a row of "Y"-shaped protrusions Any "Y" shaped protrusions on the other side are between the two "Y" shaped protrusions that protrude from the other row of "Y" shapes.

For the wheel of the above structure, although the steering in any direction can be realized, the convex rim of the connecting bracket in CN201061980Y is integrally formed with the hub type DC brushless motor; the Y-shaped protrusion of the driven wheel 2-2 is installed in CN204352052U. 2-3 is integrally formed with the hub 2-1, and these integrally formed structures cause an increase in manufacturing difficulty and an increase in manufacturing cost. For the patent in CN204352052U, since the spacing between adjacent two Y-shaped projections is fixed, when the two ends of the driven wheel 2-2 are respectively inserted into the through holes provided in the Y-shaped protruding end, It is necessary to make the driven wheel 2-2 generate a shape variable to be assembled. Such a structure is not only difficult to install, but also causes the driven wheel to be deformed, resulting in a decrease in accuracy after installation.

Summary of the invention

It is an object of the present invention to provide a universal wheel that reduces assembly difficulty and improves assembly accuracy.

The technical solutions to solve the above technical problems are as follows: S

A universal wheel includes a hub and a roller. The circumferential surface of the hub is provided with a radial flange, and further includes a bracket assembly fixed on the flange. The bracket assembly has a plurality of parallel surfaces. a mounting seat in the radial direction of the hub, each of the mounting seats being formed by the discrete first mounting seat and the second mounting seat being fastened together, and the first mounting legs are respectively provided with first arcs on the same circumference a second arcuate groove on the same circumference is respectively provided at two ends of each second mounting seat;

The end of the roller is placed in the first curved slot, and after the second mounting is fastened to the first mounting seat, the end of the roller is movably assembled to the first curved slot on the first mounting seat And a circular hole surrounded by the second arcuate groove on the second mounting seat; or the end of the roller is placed in the second arcuate groove, the first mounting seat is fastened to the second mounting seat, and the roller is fastened The ends are movably assembled into a circular aperture defined by a first arcuate slot on the first mount and a second arcuate slot on the second mount.

The manufacture of the bracket assembly and the hub separately facilitates the reduction of manufacturing difficulty. The hub and the bracket assembly and the mount can be manufactured from different materials, which is advantageous in reducing the manufacturing cost and the accuracy is easily controlled. During assembly, the end of the roller is placed in the first arcuate slot, and after the second mount is fastened to the first mount, the end of the roller is movably assembled to the first mount In the circular hole surrounded by the first curved groove and the second curved groove on the second mounting seat, such a structure not only changes easily when the roller is assembled, but also avoids deformation of the roller during assembly, so that after assembly The accuracy is guaranteed. Therefore, the invention has the advantages that the product has no eccentric moment during use, becomes more stable and has a long service life.

DRAWINGS

1 is a schematic view of a front wheel in an electric wheelchair in the prior art;

Figure 2 is a schematic view of the structure of the present invention;

Figure 3 is a schematic perspective view of the present invention;

4 is a schematic cross-sectional structural view of the present invention after hiding the end cover, the shaft, and the DC brushless motor;

Figure 5 is a schematic view of the hub after hiding the hub on the basis of Figure 4;

Figure 6 is a schematic view of a hub;

Figure 7 is a schematic view of the first bracket;

Figure 8 is a schematic view of the second bracket;

Figure 9 is a relationship diagram of the arc radius of the mount and the radius of the roller arc;

Figure 10 is a schematic view of the end cap, shaft and DC brushless motor assembled in the hub;

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

20 is a bracket assembly, 20a is a mounting slot, 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 mount, 23a is first An arcuate groove, 24 is a second seat, 24a is a second arcuate groove, and 25 is a first step;

30 is a roller and 31 is a bearing;

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

Detailed ways

As shown in FIGS. 2 to 5, a universal wheel of the present invention includes a hub 10, a bracket assembly 20, and a drum-shaped roller 30. The following describes each part and the relationship therebetween:

As shown in FIG. 2 to FIG. 6, the circumferential surface of the hub 10 is provided with a radial flange 11, and the number of the flanges 11 is preferably two sets, each of which may be composed of one continuous annular flange or It is composed of a plurality of discrete flanges, and in this embodiment, each group preferably takes the annular flange 11. The flange 11 is provided with a plurality of axial mounting holes 11a for mounting the bracket assembly.

In one or more embodiments, preferably, the distance between the end of the flange 11 adjacent the axial end face of the hub 10 and the axial end face of the hub 10 is greater than 1 mm to form a space 12 for assembling a portion of the bracket assembly to avoid After the bracket assembly 20 is assembled with the hub 10, the bracket assembly 20 protrudes to the axially outer side of the axial end surface of the hub 10. If the end caps are mounted at both ends of the hub, the bracket assembly 20 can be prevented from interfering with the assembly of the end cover. The space 13 between the two flanges 11 on the hub 10 forms a space for assembling a portion of the bracket assembly.

As shown in FIGS. 2 to 8, the bracket assembly 20 is fixed to the flange 11, and the bracket assembly 20 is provided with a fitting groove 20a for accommodating the flange 11, and the flange 11 is inserted into the fitting 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 the discrete first bracket 21 and the second bracket 22 being fastened together, and the first bracket 21 and the second bracket 22 are formed. Each of the first bracket 21 and the second bracket 22 is sleeved on the hub 10, and the second bracket 22 is screwed to the mounting hole on the flange 11, so that the second bracket 22 and the flange 11 are fastened to One.

As shown in FIG. 4 and FIG. 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 For the first bracket 21 installed in the space 12, the structure of the integral ring may be adopted, or a structure in which a plurality of curved brackets are combined to form a ring may be adopted. In this embodiment, the first bracket 21 is preferably used. Monolithic ring structure.

As shown in FIGS. 4 and 5, for the second bracket 22 mounted at the space 13, since the flanges 11 in this embodiment are two, it is necessary to set the second bracket 21 to at least two. The arc-shaped brackets are composed, so that the second brackets can be installed in the space 13 respectively. Each of the arc-shaped brackets preferably adopts a semi-circular structure. Of course, the curved brackets may not be semi-circular as long as the curved brackets are connected end to end to form a ring. The second bracket 22 can be, for example, when the arc bracket is three, each arc bracket has an arc of 120 degrees, and when the arc bracket is two, one of the arc brackets has an arc of less than 180 degrees, and the other A curved bracket has an arc greater than 180 degrees.

As shown in FIG. 4 and FIG. 5, in the present embodiment, the flanges 11 on the circumferential surface of the hub are two sets, and each of the sets of flanges 11 is mounted with the bracket assembly 20, and each set of bracket assemblies 20 One end of the curved bracket abuts against the flange 11 on which the bracket assembly is mounted, and the other end of the curved bracket in each set of bracket assemblies 20 is provided with an axial extension 22a, wherein the arcuate bracket of the set of bracket assemblies 20 The axially extending portions 22a abut the axial extensions of the arcuate brackets of the other set of bracket assemblies to form an axial limit with each other. With such a configuration, both the second bracket 22 is installed in the space 13 and one end of the two second brackets 22 can be axially restrained by the flange 11, and the other ends of the two second brackets 22 Limiting each other, the second bracket 22 is made more stable after assembly.

As shown in FIG. 2 to FIG. 8, the peripheral surface of the bracket assembly 20 is uniformly provided with a plurality of mounting seats parallel to the radial direction of the hub, and each mounting seat is tightly held by the discrete first mounting seat 23 and the second mounting seat 24. After being solidified, one end of the first mounting seat 23 is located on the circumference of the first bracket 21, and one end of the second mounting seat 24 is located on the circumference of the second bracket 22. The first mounting seat 23 is integrally formed with the first bracket 21, the second mounting seat 24 is integrally formed with the second bracket 22, and the first mounting seat 23 is fastened with the second mounting seat 24 by screws, so that the first bracket 21 and the first bracket 21 are The second bracket 22 is fixed in one body.

As shown in FIG. 2 to FIG. 8 , each of the first mounting seats 23 extends along the radial direction of the first bracket 21 to the axial end surface of the first bracket 21 to form a first step 25 , and the first step 25 is not only increased. The strength of the first bracket 21, and the first step 25 is preferentially formed in an end-to-end state to form an annular step. When the first bracket 21 is close to the second bracket 22, the axial end surface of the second bracket 22 is first. After the axial end faces of the step 25 abut each other, the fitting groove 20a is enclosed between the axial end surface of the first bracket 21, the axial end surface of the second bracket 22, and the first step 25.

As shown in FIG. 2 to FIG. 8 , the universal wheel of the present invention rotates in any other direction except for rotating in the circumferential direction during use. Therefore, the force of the universal wheel is in any direction. Force. In the present invention, the bracket assembly 20 and the hub 10 are separately assembled and integrated, and therefore, the strength of the bracket assembly 20 is reduced compared to the bracket assembly directly formed on the hub 10, thereby, at one or more In one embodiment, in order to increase the strength of the bracket assembly 20, a rib 22b is provided on the axially extending portion 22a, one end of the rib 22b is fixed to the second mounting seat 24, and the rib 22b and the shaft of the second mounting bracket 24 The end faces are connected such that when the universal wheel is subjected to a non-circumferential force, these forces are resisted by the support of the ribs 22b, and the second mount 24 can be prevented from being broken.

The first mounting seat 23 and the second mounting seat 24 are preferably fastened by screws. The two ends of each of the first mounting seats 23 are respectively provided with a first arcuate groove 23a on the same circumference, and two of the second mounting seats 24 The ends are respectively provided with second arcuate grooves 24a on the same circumference. The shape of the roller 30 is preferably in the shape of a waist drum, and the end of the roller 30 is placed in the second arcuate groove. After the first mounting seat 23 is fastened to the second mounting seat 24, the end of the roller 30 is actively moved. It is fitted into a circular hole surrounded by the first arcuate groove 23a on the first mount 23 and the second arcuate groove 24 on the second mount 24.

In the above assembly manner, when the bracket assembly 20 is mounted, the flange 11 of the second bracket 22 is first fastened, the end of the roller 30 is placed in the second arcuate groove 24a, and the first bracket 21 is moved toward the second bracket 22 At the same time, finally, the first mount and the second mount are fastened, and finally the end of the roller 30 is movably fitted to the first arcuate groove 23a and the second mount by the first mount 23. The second arcuate groove 24 on the 24 is formed in a circular hole. Thus, a plurality of rollers 30 are arranged along the circumference of the bracket assembly 20, the rollers 30 are movable along with the hub 10 as a whole, and the rollers 30 can also be rotated on the mount to accommodate movement in any direction.

The arc of the first arcuate groove 23a and the second arcuate groove 24a may each be 180, or the arc of the first arcuate groove 23a is less than 180 degrees, and the arc of the second arcuate groove 24a is greater than 180 degrees. The first arcuate groove 23a may have an arc greater than 180 degrees, and the second arcuate groove 24a has an arc of less than 180 degrees. In short, the sum of the two arcs is 360 degrees to make the first arcuate groove 23a. It is sufficient to form a circular hole together with the second curved 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 closed and fastened, the bearing 31 is fitted to the first curved groove 23a and the second by the first mounting seat 23. The second arcuate groove 24a on the mounting seat 24 is formed in a circular hole. By mounting the bearing 31 at both ends of the roller 30, the friction between the roller 30 and the mount can be reduced, making the roller 30 more flexible when it is rotated.

In this embodiment, since the flanges 11 on the circumferential surface of the hub are two groups, the bracket assembly 20 is mounted on each of the sets of flanges 11, and the rollers 30 on the mounting brackets of the two sets of bracket assemblies 20 are The staggered complementary arrays are arranged in an isosceles triangle between the center points of the curved surfaces of the three rollers 30 which are mutually staggered and complementarily arranged, and the two rollers of the three rollers are mounted on the mount of the same row of bracket assemblies 20. 30 is located on the bottom edge of the isosceles triangle. Here, the three rows of the rollers 30 of the two sets of bracket assemblies 20 are arranged in an isosceles triangle arrangement between the three rows of rollers arranged in a complementary arrangement. The structure is arranged such that the three rollers of the ground are always balanced and contact with the bottom surface at the same time, so that The wheel is always in a stable state during the running process. If the three rollers 30 of the two sets of bracket assemblies 20 are alternately arranged in a non-isoscelial triangle arrangement, the universal wheel is in operation. It will be unstable, especially when the universal wheel turns, there will be only two rollers landing, and the universal wheel will be unbalanced. If the universal wheel of the present invention is applied to a wheelchair, the wheelchair will also appear slightly The bumps make people in a wheelchair feel uncomfortable.

As shown in FIGS. 2 to 9, the outer top ends of the first mount 23 and the second mount 24 are arcuately concentric with the hub 10, the radius of the arc is r, and the curved surface of the drum-shaped roller 30 is curved. The radius of the concentric circle with the hub is R1, and the value of r/R1 is in the range of 0.96 to 0.98. The value of r/R1 is set in the range of 0.96 to 0.98, and the stability and life of the universal wheel are the best. If it is less than the numerical range, the support assembly 20 and the mounting seat have poor support force for the roller 30, and the roller 30 The self-stress is relatively large, which will affect the life of the roller; if it is larger than this value range, although the support component of the bracket assembly 20 and the mounting bracket is good, the ability of the universal wheel to pass over the obstacle is reduced, and the bracket assembly is reduced. 20 and the seat will form a resistance.

As shown in FIG. 2, FIG. 3 and FIG. 10, an end cover 40, a shaft 41, a brushless DC motor 42 and a gear transmission mechanism 43 are further included. The hub 10 has a hollow shape and has openings at both ends, and the inner wall surface of the hub 10 is provided. With a ring gear, the end cover 40 is fixed on the axial end surface of the hub 10, and an assembly hole is provided 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 screwed The hub 10 is fastened in one piece. The brushless DC motor 42 is located inside the hub 10. After one end of the shaft 41 passes through the center of the brushless DC motor 42, the two ends of the shaft 41 are respectively supported on the end cover 40, and the gear transmission mechanism is disposed on the output of the DC brushless motor 42. End, the gear transmission 43 meshes with the ring gear on the inner wall of the hub 10.

The present invention is not limited to the above embodiment, for example, the end of the roller 30 is placed in the first curved groove 23a, and after the second mounting seat 24 is fastened to the first mounting seat 23, the end of the roller 30 is It is movably fitted into a circular hole surrounded by the first arcuate groove 23a on the first mount 23 and the second arcuate groove 24a on the second mount 24. In this manner of assembly, when the bracket assembly 20 is mounted, the first bracket 21 and the flange 11 are first fastened, the end of the roller 30 is placed in the first curved slot 23a, and the second bracket 22 is first. The brackets 21 are brought together, and finally, the first mount and the second mount are fastened, and finally the ends of the rollers 30 are movably fitted to the first curved slots 23a and the second by the first mount 23. The second arcuate groove 24 in the mounting seat 24 is formed in a circular hole.

An arc-shaped protective edge 21a surrounding the outer side of the roller 30 is disposed between the two adjacent first mounting seats 23, and the protective edge 21a is integrally formed with the first bracket 21 and the first mounting seat 23, and the 30 roller 2 is protected. There is a gap along the 5th.

Claims

A universal wheel comprising a hub and a roller, wherein the circumferential surface of the hub is provided with a radial flange, and further comprises a bracket assembly fixed on the flange, the circumferential surface of the bracket assembly is evenly distributed a plurality of mounting seats parallel to the radial direction of the hub, each mounting seat being 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 disposed on the same circumference a first arcuate groove, each of the two ends of each of the second mounting seats is respectively provided with a second arcuate groove on the same circumference;

The end of the roller is placed in the first curved slot, and after the second mounting is fastened to the first mounting seat, the end of the roller is movably assembled to the first curved slot on the first mounting seat And a circular hole surrounded by the second arcuate groove on the second mounting seat; or the end of the roller is placed in the second arcuate groove, the first mounting seat is fastened to the second mounting seat, and the roller is fastened The ends are movably assembled into a circular aperture defined by a first arcuate slot on the first mount and a second arcuate slot on the second mount.
The universal wheel according to claim 1, wherein the bracket assembly is provided with a fitting groove for receiving the flange, and after the flange is inserted into the fitting groove, the bracket assembly and the flange are fastened. The pieces are fastened together.
The universal wheel according to claim 1 or 2, wherein the bracket assembly is formed by the discrete first bracket and the second bracket being fastened together, and the first mount is located on the circumference of the first bracket. The second mount is located on a circumference of the second bracket.
The universal wheel according to claim 3, wherein each of the first mounting seats extends along a radial direction of the first bracket to an axial end surface of the first bracket to form a first step, the first bracket facing When the two brackets are close together, the axial end surface of the second bracket abuts against the axial end surface of the first step, and is surrounded by the axial end surface of the first bracket, the axial end surface of the second bracket, and the first step. Said assembly slot.
The universal wheel according to claim 3, wherein the first bracket and the second bracket are both annular, and the first bracket and the second bracket are respectively sleeved on the hub.
The universal wheel according to claim 5, wherein said second bracket is composed of at least two curved brackets.
The universal wheel according to claim 6, wherein the flange on the circumferential surface of the hub is two sets, and each of the sets of flanges is mounted with the bracket assembly, and the arc in each set of bracket assemblies One end of the bracket abuts against a flange on which the bracket assembly is mounted, and the other end of the bracket in each bracket assembly is provided with an axial extension, wherein the axial extension of the arc bracket in the bracket assembly is The axial extensions of the curved brackets in the other set of bracket assemblies abut each other to form an axial limit with each other.
A universal wheel according to claim 7, wherein said axially extending portion is provided with a rib, and one end of the rib is fixed to the second mounting.
The universal wheel according to claim 1, wherein the end of the roller is provided with a bearing, and after the first mounting seat and the second mounting seat are close together and fastened, the bearing is assembled to the first mounting seat. The first arcuate groove and the second arcuate groove on the second mount enclose a circular hole.
The universal wheel according to claim 1, further comprising an end cover, a shaft, a brushless DC motor, and a gear transmission mechanism, wherein the hub is hollow and has openings at both ends, and the inner wall surface of the hub is provided with a ring gear The end cover is fixed on the axial end surface of the hub, the DC brushless motor is located inside the hub, and 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, and the gear transmission mechanism is set in the DC At the output of the brushless motor, the gear transmission meshes with the ring gear on the inner wall of the hub.