TW202126276A - Wheel chair driving structure - Google Patents

Abstract

The present disclosure provides a wheel chair driving structure which is disposed at a wheel of a wheel chair. The wheel chair driving structure includes a hub, a central axle set, a planetary gear set, a motor unit and a driving rod unit. The central axle set is disposed within the hub, and the planetary wheel set disposed within the hub includes a sun gear, a ring gear, at least one planetary gear and a planetary arm. The sun gear sleeves on the central axle set. The ring gear sleeves on the central axle and is affixed to the hub. The at least one planetary gear is engaged between the sun gear and the ring gear. The planetary arm is pivotally connected to the at least one planetary gear. The motor unit is disposed within the hub and is coupled to the planetary arm. The driving rod unit is connected to the sun gear. Operation of the central rod set selectively prohibits the sun gear or the planetary arm from rotating relative to the central axle set. Therefore, the wheel chair driving structure can be simplified.

Description

Wheelchair drive structure

The present invention relates to a wheelchair drive structure, and more particularly to a wheelchair drive structure with both manual drive and electric drive.

At present, in the calculation of the disability population statistics, the proportion of persons with physical disabilities is the highest, about 31% of the persons with disabilities; therefore, the mobility aids that assist the movement of the lower limbs are becoming more and more important. Furthermore, in addition to providing mobility aids for people with lower limb mobility, the elderly also have their needs. As the current signs of population ageing continue to grow, many academics have invested in the development and improvement of mobility aids.

Wheelchairs are common mobility aids, and the drive of wheelchairs can be divided into manual drive and electric drive. The conventional manual drive method is hand-wheel drive. However, hand-wheel drive is likely to cause ligament compression in the wrist joints and cause chronic problems. Sports injuries, so there is room for improvement. The electric drive uses a motor to provide power, which can reduce the burden on the user, but the electric drive easily causes the weight and volume of the wheelchair to increase, and it also causes storage problems.

In order to increase the convenience of the wheelchair, a wheelchair with both manual drive and electric drive was developed. However, the above-mentioned problems still exist, and the drive The dynamic structure is more complicated. In view of this, how to effectively improve the driving structure of the wheelchair has become the goal of the relevant industry.

In order to solve the above problems, the present invention provides a wheelchair drive structure, through which the structure configuration can achieve the advantages of working mode switching and structure simplification.

An embodiment according to an aspect of the present invention provides a wheelchair driving structure, which is disposed on a wheel of a wheelchair and includes a hub, a central shaft assembly, a planetary gear set, a motor unit and a drive rod unit. The central shaft assembly is located in the hub, and the planetary gear set is located in the hub and includes a sun gear, a ring gear, at least one planetary gear and a planetary arm. The sun gear is sleeved on the central shaft assembly, the ring gear is sleeved on the central shaft assembly and fixedly connected to the hub, the at least one planet gear is meshed between the sun gear and the ring gear, and the planet arm is pivotally connected to the at least one planet gear. The motor unit is located in the hub and is coupled to the planetary arm, and the driving rod unit is linked with the sun gear. Wherein, the central shaft assembly acts to selectively prevent the sun gear or the planetary arm from rotating relative to the central shaft assembly.

Thereby, when the central shaft assembly restricts the sun gear, the motor unit drives the hub to rotate; conversely, when the central shaft assembly restricts the planetary arm, the drive rod unit drives the hub to rotate, which has the advantage of simplifying the structure.

According to multiple embodiments of the aforementioned wheelchair drive structure, the central shaft assembly includes a main shaft, a switching shaft, a first pawl and a second pawl. The main shaft contains a set of pipe parts, and the sleeve part contains two openings arranged at intervals, and the switching shaft It is rotatably inserted in the sleeve part, the first pawl is movably located in an opening and is selectively coupled to the sun gear, and the second pawl is movably located in the other opening and is selectively coupled to the planetary arm . When the switching shaft is actuated to couple the first pawl with the sun gear, the sun gear is prevented from rotating relative to the central shaft assembly; when the switching shaft is actuated to couple the second pawl with the planetary arm, the planetary arm is prevented from rotating relative to the central shaft assembly.

According to multiple embodiments of the aforementioned wheelchair drive structure, the switching shaft includes a first sun gear restricting groove, a second sun gear restricting groove, a first planetary arm restricting groove, and a second planetary arm restricting groove. The second sun gear restricting groove is adjacent to the first sun gear restricting groove, the first planetary arm restricting groove and the second sun gear restricting groove are arranged along an axial direction of the switching shaft, and the second planetary arm restricting groove is restricted by the first planetary arm The slots are adjacent. Wherein, the switching shaft is actuated to switch between a first position, a second position, and a third position. When the switching shaft is at the first position, the first pawl is aligned with the first sun gear restricting groove, so that the first A pawl is separated from the sun gear. At this time, only the drive rod unit is allowed to drive the sun gear to rotate relative to the central shaft assembly; when the switching shaft is in the second position, the first pawl is aligned with the second sun gear restricting slot and the second pawl The pawl is aligned with the limiting groove of the first planetary arm to separate the first pawl from the sun gear and the second pawl to separate the planetary arm. At this time, the motor unit is allowed to drive the planetary arm and the drive rod unit is allowed to drive the sun gear to oppose each other. The central shaft assembly rotates; when the switching shaft is in the third position, the second pawl is aligned with the second planetary arm limiting groove to separate the second pawl from the planetary arm. At this time, only the motor unit is allowed to drive the planetary arm relative to the center The shaft assembly rotates.

According to multiple embodiments of the aforementioned wheelchair drive structure, the motor unit includes a reduction gear set and a hub motor, the reduction gear set is linked with the planetary arm, and the hub motor is connected to drive the reduction gear set.

According to the multiple embodiments of the aforementioned wheelchair driving structure, the driving rod unit includes a transmission wheel, a steering wheel assembly and a push rod. The transmission wheel is connected to the sun gear, the steering wheel assembly is selectively coupled to the transmission wheel, and the push rod is connected to the steering wheel assembly. Wherein, when the steering wheel assembly is coupled to the transmission wheel, the push rod is actuated to drive the transmission wheel to rotate.

According to multiple embodiments of the aforementioned wheelchair drive structure, the steering wheel assembly includes a main drive gear, a first steering gear, a second steering gear, and a steering wheel. The main drive gear is driven to rotate by the push rod, and the first steering wheel The gear is meshed with the main driving gear, the second steering gear is meshed with the first steering gear, the steering wheel is connected with the first steering gear and the second steering gear, and the steering wheel drives the displacement of the first steering gear and the second steering gear. The steering wheel is switched between a forward position and a backward position. When the steering wheel is in the forward position, the first steering gear is meshed with the transmission wheel; when the steering wheel is in the backward position, the second steering gear is meshed with the transmission wheel.

According to multiple embodiments of the aforementioned wheelchair driving structure, the steering wheel is further switched to a neutral position. When the steering wheel is in the neutral position, both the first steering gear and the second steering gear are separated from the transmission wheel.

According to the multiple embodiments of the aforementioned wheelchair drive structure, the push rod includes a one-way bearing, and the one-way bearing is pivotally connected to the main drive gear.

According to the plural embodiments of the aforementioned wheelchair driving structure, the wheelchair further includes a disc brake unit, and the disc brake unit is coupled to the wheel hub.

According to the multiple embodiments of the aforementioned wheelchair driving structure, the driving rod unit further includes a wireless controller that opens and closes the motor unit.

10‧‧‧Wheelchair drive structure

100‧‧‧wheel

110‧‧‧Shell

120‧‧‧Cover

200‧‧‧Central shaft assembly

210‧‧‧First pawl

220‧‧‧Second pawl

230‧‧‧Spindle

231, 232‧‧‧Opening

240‧‧‧Switching axis

241‧‧‧The first sun gear limit groove

242‧‧‧Second Sun Gear Restriction Groove

243‧‧‧First planetary arm restriction groove

244‧‧‧Second planetary arm restriction groove

411‧‧‧Motor housing

4111‧‧‧Drive gear

420‧‧‧Reduction gear set

421‧‧‧First reduction gear

422‧‧‧Second reduction gear

500‧‧‧Drive rod unit

510‧‧‧Steering Wheel Assembly

511‧‧‧Main drive gear

512‧‧‧First steering gear

513‧‧‧Second steering gear

514‧‧‧Steering Wheel

5141‧‧‧Limit pin

515‧‧‧Fixed Disk

5151, 5152, 5153‧‧‧Aperture

245‧‧‧end face

300‧‧‧Planetary gear set

310‧‧‧Sun Gear

320‧‧‧Planetary gear

330‧‧‧Ring Gear

340‧‧‧Planetary Arm

400‧‧‧Motor unit

410‧‧‧Wheel Motor

520‧‧‧Putter

521‧‧‧One-way bearing

522‧‧‧Upper pole

523‧‧‧Lower pole

524‧‧‧Quick release seat tube bundle

530‧‧‧Drive wheel

540‧‧‧Wireless Controller

600‧‧‧Disc brake unit

Figure 1 is a perspective view of a wheelchair driving structure according to an embodiment of the present invention;

Figure 2 shows an exploded schematic diagram of the wheelchair drive structure of the embodiment in Figure 1;

Fig. 3 is a perspective schematic view of a switch shaft of the wheelchair drive structure of the embodiment in Fig. 1;

Figure 4 shows a schematic cross-sectional view of the wheelchair drive structure of the embodiment in Figure 1;

Figure 5 shows another schematic cross-sectional view of the wheelchair drive structure of the embodiment in Figure 1;

Fig. 6 shows another schematic cross-sectional view of the wheelchair driving structure of the embodiment in Fig. 1;

Fig. 7 is an exploded schematic diagram of a driving rod unit of the wheelchair driving structure of the embodiment in Fig. 1;

Figure 8 is a schematic side view of the wheelchair drive structure of the embodiment in Figure 1;

Figure 9 is another schematic side view of the wheelchair drive structure of the embodiment in Figure 1; and

Fig. 10 is another schematic side view of the wheelchair driving structure of the embodiment in Fig. 1.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. For the sake of clarity, many practical details will be explained in the following description. However, the reader should understand that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, for the sake of simplification of the drawings, some conventionally used structures and elements will be drawn in a simple schematic manner in the drawings; and repeated elements may be represented by the same or similar numbers.

In addition, when a component (or mechanism or module, etc.) is “connected”, “configured” or “coupled” to another component in this document, it can mean that the component is directly connected, directly disposed, or directly coupled to another component It can also mean that an element is indirectly connected, indirectly disposed, or indirectly coupled to another element, that is, there are other elements between the element and another element. When it is clearly stated that a certain element is "directly connected", "directly arranged" or "directly coupled" to another element, it means that there is no other element between the element and another element. The terms first, second, third, etc. are only used to describe different elements or components, and have no limitation on the elements/components themselves. Therefore, the first element/component can also be referred to as the second element/component. And the combination of components/components/mechanisms/modules in this article is not a combination of general well-known, conventional or conventional in this field. Whether the component/component/mechanism/module itself is conventional or not can not be used to determine whether the combination relationship is It can be easily completed by ordinary knowledgeable persons in the technical field.

Please refer to Figures 1 and 2. Figure 1 is a perspective view of a wheelchair drive structure 10 according to an embodiment of the present invention, and Figure 2 is an exploded view of the wheelchair drive structure 10 of the embodiment in Figure 1 . Wheelchair drive The movable structure 10 is disposed on a wheel (not shown) of a wheelchair (not shown) and includes a hub 100, a central shaft assembly 200, a planetary gear set 300, a motor unit 400 and a drive rod unit 500.

The central shaft assembly 200 is located in the hub 100, and the planetary gear set 300 is located in the hub 100 and includes a sun gear 310, a ring gear 330, at least one planet gear 320 and a planet arm 340. The sun gear 310 is sleeved on the central shaft assembly 200, the ring gear 330 is sleeved on the central shaft assembly 200 and is fixed to the hub 100, the aforementioned at least one planet gear 320 is meshed between the sun gear 310 and the ring gear 330, and the planetary arm 340 It is pivotally connected to the aforementioned at least one planetary gear 320. The motor unit 400 is located in the hub 100 and is coupled to the planetary arm 340, and the driving rod unit 500 is connected to the sun gear 310. The central shaft assembly 200 acts to selectively prevent the sun gear 310 or the planetary arm 340 from rotating relative to the central shaft assembly 200.

Thereby, when the central shaft assembly 200 restricts the sun gear 310, the motor unit 400 drives the hub 100 to rotate; conversely, when the central shaft assembly 200 restricts the planetary arm 340, the drive rod unit 500 drives the hub 100 to rotate, Furthermore, it has the advantage of simplifying the structure.

The hub 100 includes a housing 110 and a cover 120. The housing 110 includes an accommodating space (not labeled) for the planetary gear set 300 and the motor unit 400 to accommodate, and the cover 120 is connected to one end of the housing 110.

In the planetary gear set 300, the number of planetary gears 320 is three, but this does not limit the present invention. In terms of structural configuration, the sun gear 310 is located in the center and includes external teeth (not labeled), the three planetary gear 320 is pivoted on the planetary arm 340, and the three planetary gear 320 is ringed on the outer side of the sun gear 310 to engage with External teeth of sun gear 310. The ring gear 330 includes a plurality of internal teeth (not labeled) for meshing with the three planetary gears 320, and the ring gear 330 can be screw-locked on the hub 100 to move simultaneously with the hub 100.

The motor unit 400 may include a reduction gear set 420 and a hub motor 410, the reduction gear set 420 is linked with the planetary arm 340, and the hub motor 410 is connected to drive the reduction gear set 420. More specifically, the hub motor 410 may include a motor housing 411 connected to an outer rotor (not shown) of the hub motor 410, and the rotation of the outer rotor can drive the motor housing 411 to rotate. The motor housing 411 includes driving teeth 4111, and the driving teeth 4111 can be engaged with the reduction gear set 420. The reduction gear set 420 includes a first reduction gear 421 and a second reduction gear 422. The first reduction gear 421 and the second reduction gear 422 are linked, and the first reduction gear 421 is driven by the driving tooth 4111, and the second reduction gear 422 is engaged Connecting teeth (not shown) on the planetary arm 340. Therefore, when the hub motor 410 rotates, the motor housing 411 can be driven to link the first reduction gear 421, the second reduction gear 422 and the planetary arm 340 to rotate.

The central shaft assembly 200 may include a main shaft 230, a switching shaft 240, a first pawl 210 and a second pawl 220. The main shaft 230 includes a sleeve portion (not labeled), and the sleeve portion includes two openings 231, 232 arranged at intervals, the switching shaft 240 is rotatably inserted in the sleeve portion, and the first pawl 210 is movably located in the opening 231 Inside and selectively coupled to the sun gear 310, the second pawl 220 is movably located in the opening 232 and is selectively coupled to the planetary arm 340. Wherein, when the switching shaft 240 is actuated to couple the first pawl 210 with the sun gear 310, the sun gear 310 is prevented from rotating relative to the central shaft assembly 200; the switching shaft When 240 is actuated to couple the second pawl 220 with the planetary arm 340, the planetary arm 340 is prevented from rotating relative to the central shaft assembly 200.

Please refer to FIG. 3, and please also refer to FIG. 2. FIG. 3 is a perspective view of a switch shaft 240 of the wheelchair driving structure 10 of the first embodiment. The switching shaft 240 may include a first sun gear restricting groove 241, a second sun gear restricting groove 242, a first planetary arm restricting groove 243, and a second planetary arm restricting groove 244. The second sun gear restricting groove 242 is adjacent to the first sun gear restricting groove 241, the first planetary arm restricting groove 243 and the second sun gear restricting groove 242 are arranged along an axial direction (not labeled) of the switching shaft 240, and the second planet The arm restricting groove 244 is adjacent to the first planetary arm restricting groove 243. Wherein, the switching shaft 240 is actuated to switch between a first position, a second position, and a third position. When the switching shaft 240 is located at the first position, the first pawl 210 is aligned with the first sun gear restricting groove 241 , So that the first pawl 210 is separated from the sun gear 310. At this time, only the drive rod unit 500 is allowed to drive the sun gear 310 to rotate relative to the central shaft assembly 200; when the switching shaft 240 is in the second position, the first pawl 210 and the first pawl 210 are The two sun gear restricting grooves 242 are aligned and the second pawl 220 is aligned with the first planetary arm restricting groove 243, so that the first pawl 210 is separated from the sun gear 310, and the second pawl 220 is separated from the planetary arm 340 At this time, the motor unit 400 is allowed to drive the planetary arm 340 and the drive rod unit 500 is allowed to drive the sun gear 310 to rotate relative to the central shaft assembly 200; when the switching shaft 240 is in the third position, the second pawl 220 and the second planetary arm restricting groove 244 is aligned so that the second pawl 220 is engaged with the planetary arm 340. At this time, only the motor unit 400 is allowed to drive the planetary arm 340 to rotate relative to the central shaft assembly 200.

In detail, the central shaft assembly 200 penetrates the center line of the hub 100, the inside of the sleeve part is hollow, the two openings 231, 232 communicate with the inside of the sleeve part, and the center of the opening 231 is between the center of the opening 232 and the center of the opening 232. The connection line is parallel to the axial direction of the switching shaft 240. In order to cooperate with the first pawl 210 and the second pawl 220, the sun gear 310 may include a plurality of internal teeth (not labeled) for the first pawl 210 to mesh with, and the planetary arm 340 may also include a plurality of internal teeth (not labeled) for the second pawl. The two pawls 220 are engaged.

When the first pawl 210 is aligned with the first sun gear restricting groove 241 or the second sun gear restricting groove 242, the first pawl 210 will slide into the first sun gear restricting groove 241 or the second sun gear restricting groove 242 , Separate the first pawl 210 from the sun gear 310; conversely, when the first pawl 210 is not aligned with the first sun gear restricting groove 241 or the second sun gear restricting groove 242, the first pawl 210 is switched axis The surface of the switching shaft 240 is raised (the surface of the switching shaft 240 is higher than the groove surface of the first sun gear restricting groove 241 or the second sun gear restricting groove 242), so it can mesh with the sun gear 310. Similarly, the relationship between the second pawl 220 and the first planetary arm restricting groove 243 and the second planetary arm restricting groove 244 is the same as the first pawl 210, the first sun gear restricting groove 241 and the second sun gear restricting groove 242 ,No longer. Thereby, by rotating the switching shaft 240, the coupling relationship between the sun gear 310 and the planetary arm 340 and the central shaft assembly 200 can be changed.

The distance between the first sun gear restricting groove 241 and the end surface 245 of the switching shaft 240 is equal to the distance between the second sun gear restricting groove 242 and the end surface 245 of the switching shaft 240. The distance between the first planetary arm restricting groove 243 and the end surface 245 of the switching shaft 240 is equal to that of the second planetary arm restricting groove 244 and The distance between the end faces 245 of the switching shaft 240 is switched. The distance between the first planetary arm restricting groove 243 and the end surface 245 of the switching shaft 240 is smaller than the distance between the first sun gear restricting groove 241 and the end surface 245 of the switching shaft 240, and the second planetary arm restricting groove 244 and the first sun gear The restriction grooves 241 are not aligned. Thereby, through the positional relationship of the first sun gear restricting groove 241, the second sun gear restricting groove 242, the first planetary arm restricting groove 243, and the second planetary arm restricting groove 244, only the sun can be fixed when the switching shaft 240 is rotated. Gear 310 or planetary arm 340.

In the embodiment shown in FIGS. 1 to 2, the driving rod unit 500 may include a transmission wheel 530, a steering wheel assembly 510 and a push rod 520. The transmission wheel 530 is connected to the sun gear 310, the steering wheel assembly 510 is selectively coupled to the transmission wheel 530, and the push rod 520 is connected to the steering wheel assembly 510. Wherein, when the steering wheel assembly 510 is coupled to the transmission wheel 530, the push rod 520 is actuated to drive the transmission wheel 530 to rotate. The operation state of the planetary gear set 300 will be described below, and the other details of the driving rod unit 500 will be described later. Detailed.

Please refer to Fig. 4, in conjunction with Figs. 2 and 3, in which Fig. 4 is a schematic cross-sectional view of the wheelchair driving structure 10 of the embodiment shown in Fig. 1. In Figure 4, the switching shaft 240 is at the first position. At this time, the first pawl 210 is aligned with the first sun gear restricting groove 241, so that the first pawl 210 is separated from the sun gear 310. The rotation is not restricted; and because the second pawl 220 is not aligned with the first planetary arm restricting groove 243 or the second planetary arm restricting groove 244, the second pawl 220 engages with the planetary arm 340, thereby restricting the planetary arm 340 relative to each other The switching shaft 240 rotates.

In this case, when the user pushes the driving rod unit 500, since the sun gear 310 is not limited, it can be driven by the driving rod unit 500. Rotate to drive the planetary gear 320. The planetary gear 320 can rotate relative to the planetary arm 340 after being linked, and finally rotate the ring gear 330 and the hub 100, which is a push rod driving mode.

Please refer to FIG. 5 in conjunction with FIGS. 2 and 3, wherein FIG. 5 shows another schematic cross-sectional view of the wheelchair driving structure 10 of the first embodiment. In Figure 5, the switching shaft 240 is in the second position. At this time, the first pawl 210 is aligned with the second sun gear restricting groove 242, so that the first pawl 210 is separated from the sun gear 310. The rotation is not restricted; and because the second pawl 220 is aligned with the first planetary arm restricting groove 243, the second pawl 220 is separated from the planetary arm 340, and the rotation of the planetary arm 340 is not restricted.

At this time, the user can push the driving rod unit 500. Since the sun gear 310 is not limited, it can be driven to rotate by the driving rod unit 500 to drive the planetary gear 320; at the same time, the motor unit 400 is activated so that the motor unit 400 drives the planetary gear. The arm 340 rotates. Therefore, the planetary gear 320 can rotate relative to the planetary arm 340 after being linked by the sun gear 310, and the planetary gear 320 is driven by the planetary arm 340 to revolve around the sun gear 310, and finally the ring gear 330 and the hub 100 rotate. This is a hybrid drive Mode, and its rotation speed will be greater than that in the push rod drive mode.

Please refer to Fig. 6 in conjunction with Figs. 2 and 3, in which Fig. 6 shows another schematic cross-sectional view of the wheelchair driving structure 10 of the first embodiment. In Figure 6, the switching shaft 240 is at the third position. At this time, the first pawl 210 is not aligned with the first sun gear restricting groove 241 or the second sun gear restricting groove 242, so the first pawl 210 and the sun The gear 310 meshes, thereby restricting the rotation of the sun gear 310 relative to the switching shaft 240; and because the second pawl 220 and The second planetary arm restricting groove 244 is aligned, so the second pawl 220 is separated from the planetary arm 340, and the rotation of the planetary arm 340 is not restricted.

At this time, the user can start the motor unit 400 to make the motor unit 400 drive the planetary arm 340 to rotate, and the planetary gear 320 is driven by the planetary arm 340 to rotate relative to the sun gear 310 and revolve around the sun gear 310 to link the ring gear 330 and the hub 100 rotation, this is the motor drive mode, and its speed is greater than the speed in the push rod drive mode, but less than the speed in the hybrid drive mode.

In the embodiment shown in FIGS. 1 to 6, the wheelchair driving structure 10 may further include a disc brake unit 600, and the disc brake unit 600 is coupled to the wheel hub 100. When the disc brake unit 600 is activated, the wheel hub 100 can be stopped and has a braking effect.

Please refer to FIG. 7. FIG. 7 is an exploded schematic diagram of a driving rod unit 500 of the wheelchair driving structure 10 of the embodiment in FIG. 1. It should be noted here that, for the sake of simplicity of the drawing, some elements of the push rod 520 (upper rod 522, lower rod 523, and quick release seat tube bundle 524) and the wireless controller 540 are only shown in Figure 7 , But omitted in other figures, but it does not limit the present invention. As shown in Figure 7, the steering wheel assembly 510 may include a main driving gear 511, a first steering gear 512, a second steering gear 513, and a steering wheel 514. The main driving gear 511 is driven to rotate by the push rod 520, and the first A steering gear 512 is meshed with the main drive gear 511, the second steering gear 513 is meshed with the first steering gear 512, the steering wheel 514 is connected to the first steering gear 512 and the second steering gear 513, and the steering wheel 514 drives the first steering The gear 512 and the second steering gear 513 are displaced. The steering wheel 514 is switched to a forward position and a rear In the backward position, when the steering wheel 514 is in the forward position, the first steering gear 512 is meshed with the transmission wheel 530; when the steering wheel 514 is in the reverse position, the second steering gear 513 is meshed with the transmission wheel 530.

Specifically, the push rod 520 can be operated by the user, and in operation, the driving wheel 530 is driven by continuously pushing and resetting the push rod 520. For this reason, the push rod 520 may include a one-way bearing 521 , The one-way bearing 521 is pivotally connected to the main drive gear 511. In this way, the push rod 520 can only drive the main driving gear 511 in one direction, and will not drive the main driving gear 511 to rotate when the push rod 520 is reset, so as to prevent the wheelchair from returning to the original position and unable to move forward due to the reverse rotation. The push rod 520 may further include an upper rod portion 522, a lower rod portion 523, and a quick release seat tube bundle 524. The lower rod portion 523 is connected to the one-way bearing 521, and the upper rod portion 522 can be sleeved on the lower rod portion 523. The seat tube bundle 524 is used to fix the relative distance between the upper rod portion 522 and the lower rod portion 523. In this way, the length of the push rod 520 can be adjusted to suit different body types of users, and the radial length of the push rod 520 can be increased so that the user has good operating comfort.

Please refer to Fig. 8 and Fig. 7 together. Fig. 8 is a schematic side view of the wheelchair driving structure 10 of the embodiment shown in Fig. 1. The steering wheel assembly 510 may further include a fixed disk 515. One end of the fixed disk 515 is for pivoting the main drive gear 511, and the other end is for pivoting the switching shaft 240. The fixed disk 515 includes three openings 5151, 5152, 5153, each of which The holes 5151, 5152, 5153 are used for the limit pin 5141 of the steering wheel 514 to limit the position. In Figure 8, the limit pin 5141 of the steering wheel 514 is limited to the opening 5151. At this time, the steering wheel 514 is in the forward position. After the push rod 520 is pushed, the main drive gear 511 and the first steering gear 512 are connected to the transmission wheel. 530, the wheelchair can move forward.

Please refer to Fig. 9 and Fig. 7 together. Fig. 9 is another schematic side view of the wheelchair driving structure 10 of the first embodiment. The steering wheel 514 is rotated so that the limit pin 5141 is restricted to the opening 5152. At this time, the steering wheel 514 is in the backward position. After the push rod 520 is pushed, the main driving gear 511, the first steering gear 512, and the second steering gear 513 are driven. The transmission wheel 530 is linked to allow the wheelchair to move backwards.

Please refer to FIG. 10, where FIG. 10 is another side view of the wheelchair driving structure 10 of the embodiment in FIG. 1. The steering wheel 514 can be further switched to a neutral position. When the steering wheel 514 is in the neutral position, the first steering gear 512 and the second steering gear 513 are both separated from the transmission wheel 530. As shown in Figure 10, at this time the steering wheel 514 is rotated so that the limit pin 5141 is restricted to the opening 5153. Since the first steering gear 512 and the second steering gear 513 are separated from the transmission wheel 530, the push rod 520 is pushed When the time, the transmission wheel 530 does not produce interlocking motion.

Please refer to Fig. 7 again, and also refer to Fig. 2. In order to control the wheelchair driving structure 10 more conveniently, the driving rod unit 500 may further include a wireless controller 540 to open and close the hub motor 410 of the motor unit 400. The wireless controller 540 can be disposed on the upper rod 522, and can further adjust the speed of the hub motor 410, but the present invention is not limited to this.

It can be seen from the above-mentioned embodiments that the wheelchair drive structure of the present invention has the following advantages.

1. Compared with the general hand-wheel drive, the push rod drive method can reduce the ligament compression of the user's wrist joints and cause chronic sports injuries, and its labor-saving effect can better meet the user's use in more terrain conditions.

2. The wheelchair drive structure has been modularized, and it can be directly installed on the pillar of a general manual wheelchair without affecting the folding of the wheelchair, which has the advantage of convenient application.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be subject to the definition of the attached patent application scope.

10‧‧‧Wheelchair drive structure

110‧‧‧Shell

120‧‧‧Cover

200‧‧‧Central shaft assembly

210‧‧‧First pawl

220‧‧‧Second pawl

230‧‧‧Spindle

231, 232‧‧‧Opening

340‧‧‧Planetary Arm

400‧‧‧Motor unit

410‧‧‧Wheel Motor

411‧‧‧Motor housing

4111‧‧‧Drive gear

420‧‧‧Reduction gear set

421‧‧‧First reduction gear

422‧‧‧Second reduction gear

240‧‧‧Switching axis

300‧‧‧Planetary gear set

310‧‧‧Sun Gear

320‧‧‧Planetary gear

330‧‧‧Ring Gear

500‧‧‧Drive rod unit

510‧‧‧Steering Wheel Assembly

520‧‧‧Putter

530‧‧‧Drive wheel

600‧‧‧Disc brake unit

Claims (10)

A wheelchair driving structure is arranged on a wheel of a wheelchair, and the wheelchair driving structure includes: A wheel A central shaft assembly located in the hub; A planetary gear set located in the hub and containing: A sun gear sleeved on the central shaft assembly; A ring gear sleeved on the central shaft assembly and fixedly connected with the hub; At least one planetary gear meshed between the sun gear and the ring gear; and A planetary arm pivotally connected to the at least one planetary gear; A motor unit located in the hub and coupled to the planetary arm; and A driving rod unit, linked to the sun gear; Wherein, the central shaft assembly operates to selectively prevent the sun gear or the planetary arm from rotating relative to the central shaft assembly. The wheelchair drive structure described in item 1 of the scope of patent application, wherein the central shaft assembly includes: A main shaft includes a sleeve portion, and the sleeve portion includes two openings arranged at intervals; A switching shaft is rotatably inserted in the sleeve part; A first pawl movably located in an opening and selectively coupled to the sun gear; and A second pawl is movably located in the other opening and is selectively coupled to the planetary arm; Wherein, when the switching shaft is actuated to couple the first pawl with the sun gear, the sun gear is prevented from rotating relative to the central shaft assembly; when the switching shaft is actuated, the second pawl is prevented from being coupled with the planetary arm The planetary arm rotates relative to the central shaft assembly. For the wheelchair drive structure described in item 2 of the scope of patent application, the switching shaft includes: A first sun gear restricting groove; A second sun gear restricting groove adjacent to the first sun gear restricting groove; A first planetary arm restricting groove and the second sun gear restricting groove are arranged along an axial direction of the switching shaft; and A second planetary arm restricting groove adjacent to the first planetary arm restricting groove; Wherein, the switching shaft is actuated to switch between a first position, a second position, and a third position. When the switching shaft is located at the first position, the first pawl is aligned with the first sun gear restricting groove Position, so that the first pawl is separated from the sun gear. At this time, only the drive rod unit is allowed to drive the sun gear to rotate relative to the central shaft assembly; when the switching shaft is at the second position When, the first pawl is aligned with the second sun gear restricting groove and the second pawl is aligned with the first planetary arm restricting groove, so that the first pawl is separated from the sun gear, and the The second pawl is separated from the planetary arm. At this time, the motor unit is allowed to drive the planetary arm and the drive rod unit is allowed to drive the sun gear to rotate relative to the central shaft assembly; when the switching shaft is at the third position, the second The pawl is aligned with the second planetary arm limiting groove to separate the second pawl from the planetary arm. At this time, only the motor unit is allowed to drive the planetary arm to rotate relative to the central shaft assembly. The wheelchair drive structure described in item 1 of the scope of patent application, wherein the motor unit includes: A reduction gear set in conjunction with the planetary arm; and A hub motor is connected to drive the reduction gear set. The wheelchair drive structure described in item 1 of the scope of patent application, wherein the drive rod unit includes: A transmission wheel, connected to the sun gear; A steering wheel assembly selectively coupled to the transmission wheel; and A push rod connected to the steering wheel assembly; Wherein, when the steering wheel assembly is coupled to the transmission wheel, the push rod is actuated to drive the transmission wheel to rotate. According to the wheelchair drive structure described in item 5 of the scope of patent application, the steering wheel assembly includes: A main drive gear, driven to rotate by the push rod; A first steering gear meshed with the main drive gear; A second steering gear meshed with the first steering gear; and A steering wheel connected to the first steering gear and the second steering gear, and the steering wheel drives the displacement of the first steering gear and the second steering gear; Wherein, the steering wheel is switched between a forward position and a backward position. When the steering wheel is in the forward position, the first steering gear is meshed with the transmission wheel; when the steering wheel is in the backward position, the second The steering gear is meshed with the transmission wheel. For example, in the wheelchair drive structure described in item 6 of the scope of patent application, the steering wheel is further switched to a neutral position. When the steering wheel is in the neutral position, the first steering gear and the second steering gear are both Separate from the transmission wheel. According to the wheelchair drive structure described in item 6 of the scope of patent application, the push rod includes a one-way bearing, and the one-way bearing is pivotally connected to the main drive gear. The wheelchair drive structure described in item 1 of the scope of patent application further includes a disc brake unit coupled to the wheel hub. The wheelchair drive structure described in item 1 of the scope of patent application, wherein the drive rod unit includes: A wireless controller opens and closes the motor unit.

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