TWI761747B - 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 driving structure, and more particularly, to a wheelchair driving structure with both manual driving and electric driving.

At present, in the calculation of the population with disabilities, the proportion of people with physical disabilities is the highest, about 31% of the people 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 those with lower extremity mobility issues, the elderly also need to use them. Due to the growing signs of an aging population, many academic circles have invested in the development and improvement of mobility aids.

Wheelchair is a common mobility aid, and the drive of wheelchair can be divided into manual drive and electric drive. The conventional manual drive method is handwheel drive. However, handwheel drive is easy to cause ligament compression at the wrist joints and cause chronic disease. Sports injuries, so there is room for improvement. Electric drives use motors to provide power, which can reduce the burden on users, but electric drives tend to increase the weight and volume of the wheelchair, and also cause storage problems.

In order to increase the convenience of the wheelchair, wheelchairs with both manual drive and electric drive have been developed, but the above problems still exist, and the drive The dynamic structure is more complex. 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 structural configuration can achieve the advantages of switching the working mode and simplifying the structure.

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 is fixedly connected with the hub, the at least one planetary gear is engaged between the sun gear and the ring gear, and the planetary arm is pivotally connected to the at least one planetary gear. The motor unit is located in the wheel hub and is coupled to the planetary arm, and the drive rod unit is linked with the sun gear. Wherein, the central shaft assembly is actuated to selectively prevent the sun gear or the planetary arm from rotating relative to the central shaft assembly.

Thereby, when the central shaft assembly limits the sun gear, the motor unit drives the hub to rotate; on the contrary, when the central shaft assembly limits the planetary arm, the driving rod unit drives the hub to rotate, which has the advantage of simplified structure.

According to various embodiments of the wheelchair driving structure, the central shaft assembly includes a main shaft, a switching shaft, a first pawl and a second pawl. The main shaft includes a sleeve part, and the sleeve part includes two openings arranged at intervals, and the switching shaft rotatably inserted in the sleeve portion, 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 another opening and 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 various embodiments of the wheelchair driving structure, the switching shaft includes a first sun gear limiting groove, a second sun gear limiting groove, a first planetary arm limiting groove and a second planetary arm limiting groove. The second sun gear limiting groove is adjacent to the first sun gear limiting groove, the first planetary arm limiting groove and the second sun gear limiting groove are arranged along an axial direction of the switching shaft, and the second planetary arm limiting groove and the first planetary arm limit Slots are adjacent. 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 limiting groove, so that the first A pawl is separated from the sun gear, at this time only the drive lever 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 limiting groove and the second pawl The pawl is aligned with the limiting groove of the first planetary arm, so that the first pawl is separated from the sun gear and 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 lever unit is allowed to drive the sun gear to face each other. The central shaft assembly rotates; when the switching shaft is at the third position, the second pawl is aligned with the second planetary arm limiting groove, so that the second pawl is separated 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 several embodiments of the 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 several embodiments of the wheelchair driving structure, the driving rod unit includes a transmission wheel, a steering wheel assembly and a push rod. The transmission wheel is connected with the sun gear, the steering wheel assembly is selectively coupled to the transmission wheel, and the push rod is connected with 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 several embodiments of the wheelchair driving structure, the steering wheel assembly includes a main driving gear, a first steering gear, a second steering gear and a steering wheel, the main driving gear is driven to rotate by a push rod, and the first steering The gear is engaged with the main driving gear, the second steering gear is engaged 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 first steering gear and the second steering gear to displace. The steering wheel is switched between a forward position and a backward position. When the steering wheel is at the forward position, the first steering gear is engaged with the transmission wheel; when the steering wheel is at the backward position, the second steering gear is engaged with the transmission wheel.

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

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

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

According to several embodiments of the aforementioned wheelchair driving structure, the driving rod unit further includes a wireless controller, which activates and closes the motor unit.

10: Wheelchair drive structure

100: Wheels

110: Shell

120: Cover

200: Center shaft assembly

210: First Pawl

220: Second pawl

230: Spindle

231, 232: Opening

240: switch axis

241: The first sun gear limiting groove

242: The second sun gear limiting groove

243: The first planetary arm limiting groove

244: The second planetary arm limiting groove

411: Motor housing

4111: Drive tooth

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: Opening

245: End face

300: Planetary gear set

310: Sun Gear

320: Planetary gear

330: Ring Gear

340: Planetary Arm

400: Motor unit

410: Hub Motor

516: one-way bearing

520: putter

521: connecting rod

522: Upper stem

523: Lower stem

524:Quick release seat tube bundle

530: Transmission wheel

540: Wireless Controller

600: Disc brake unit

FIG. 1 is a three-dimensional schematic diagram of a wheelchair driving structure according to an embodiment of the present invention;

Fig. 2 is an exploded schematic view of the wheelchair driving structure of the embodiment of Fig. 1;

FIG. 3 is a three-dimensional schematic view of a switching shaft of the wheelchair driving structure according to the embodiment of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the wheelchair driving structure according to the embodiment of FIG. 1;

Fig. 5 is another schematic cross-sectional view of the wheelchair driving structure according to the embodiment of Fig. 1;

Fig. 6 is another schematic cross-sectional view of the wheelchair driving structure according to the embodiment of Fig. 1;

FIG. 7 is an exploded schematic view of a driving rod unit of the wheelchair driving structure according to the embodiment of FIG. 1;

Fig. 8 is a schematic side view of the wheelchair driving structure according to the embodiment of Fig. 1;

Fig. 9 is a schematic diagram of another side view of the wheelchair driving structure of the embodiment of Fig. 1; and

FIG. 10 is another schematic side view of the wheelchair driving structure according to the embodiment of FIG. 1 .

Embodiments of the present invention will be described below with reference to the drawings. For the sake of clarity, many practical details are set forth in the following description. The reader should understand, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, to simplify the drawings, some well-known and conventional structures and elements will be shown in a simplified and schematic manner in the drawings; and repeated elements may be denoted by the same or similar numerals.

In addition, when a certain element (or mechanism or module, etc.) is "connected", "arranged" or "coupled" to another element herein, it may mean that the element is directly connected, directly arranged or directly coupled to another element , can also mean that an element is indirectly connected, indirectly arranged or indirectly coupled to another element, that is, there are other elements interposed between the element and the other element. When it is expressly stated that an element is "directly connected", "directly arranged" or "directly coupled" to another element, it means that no other element is interposed between the said element and the other element. The terms first, second, and third are only used to describe different elements or components, and do not limit the elements/components themselves. Therefore, the first element/component may also be renamed as the second element/component. Moreover, the combination of elements/components/mechanisms/modules in this article is not a generally known, conventional or conventional combination in this field, and whether the components/components/mechanisms/modules themselves are known to determine whether their combination relationship is not Easily accomplished by those of ordinary knowledge in the technical field.

Please refer to FIG. 1 and FIG. 2, wherein FIG. 1 is a three-dimensional schematic diagram of a wheelchair driving structure 10 according to an embodiment of the present invention, and FIG. 2 is an exploded schematic diagram of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . wheelchair The moving structure 10 is disposed on a wheel (not shown) of a wheelchair (not shown) and includes a wheel 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 planetary 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 fixedly connected with the hub 100 , the at least one planetary gear 320 is engaged 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 wheel hub 100 and is coupled to the planetary arm 340 , and the driving rod unit 500 is linked to the sun gear 310 . The central shaft assembly 200 is actuated 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 limits the position of the sun gear 310, the motor unit 400 drives the hub 100 to rotate; on the contrary, when the central shaft assembly 200 limits the position of the planetary arm 340, the driving rod unit 500 drives the hub 100 to rotate, Furthermore, it has the advantage of simplified structure.

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

In the planetary gear set 300, the number of the planetary gears 320 is three, but the present invention is not limited by this. In terms of structural configuration, the sun gear 310 is located in the center and includes external teeth (not shown), the three planetary gears 320 are pivoted on the planetary arm 340 , and the three planetary gears 320 are annularly arranged on the outer side of the sun gear 310 to engage with the External teeth of sun gear 310 . The ring gear 330 includes a plurality of internal teeth (not shown) for engaging the three planetary gears 320 , and the ring gear 330 can be screwed on the hub 100 to move together 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 casing 411 connected to an outer rotor (not shown) of the hub motor 410 , and the rotation of the outer rotor can drive the motor casing 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 is linked with the second reduction gear 422 , the first reduction gear 421 is driven by the driving teeth 4111 , and the second reduction gear 422 is engaged with The connecting teeth (not shown) on the planetary arm 340 . Therefore, when the hub motor 410 rotates, the motor casing 411 can be driven to drive 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 shown), and the sleeve portion includes two openings 231 and 232 arranged at intervals. The switching shaft 240 is rotatably inserted into the sleeve portion, and the first pawl 210 is movably located in the opening 231 Internally and selectively coupled to the sun gear 310 , the second pawl 220 is movably positioned within the opening 232 and 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 the second pawl 220 is actuated to couple 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 refer to FIG. 2 , wherein FIG. 3 is a three-dimensional schematic diagram of a switching shaft 240 of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . The switching shaft 240 may include a first sun gear limiting slot 241 , a second sun gear limiting slot 242 , a first planetary arm limiting slot 243 and a second planetary arm limiting slot 244 . The second sun gear limiting groove 242 is adjacent to the first sun gear limiting groove 241 , the first planetary arm limiting groove 243 and the second sun gear limiting groove 242 are arranged along an axial direction (not shown) of the switching shaft 240 , the second planetary arm limiting groove 243 and the second sun gear limiting groove 242 are arranged along an axial direction (not shown) of the switching shaft 240 The arm restricting groove 244 is adjacent to the first planetary arm restricting groove 243 . 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 at the first position, the first pawl 210 is aligned with the first sun gear limiting groove 241 , so as to separate the first pawl 210 from the sun gear 310, at this time only the drive lever 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 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 lever 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 at the third position, the second pawl 220 and the second planetary arm restricting groove 244 is aligned so that the second pawl 220 is separated from 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 .

Specifically, the center shaft assembly 200 is inserted through the center line of the hub 100, the inside of the sleeve portion is hollow, the two openings 231, 232 communicate with the inside of the sleeve portion, and the center of the opening 231 and the center of the opening 232 are The connecting 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 inner teeth (not shown) for the first pawl 210 to engage with, and the planetary arm 340 may also include a plurality of inner teeth (not shown) for the first pawl 210 to engage. 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 , the first pawl 210 is separated from the sun gear 310; on the contrary, 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 shaft 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 that of the first pawl 210 and the first sun gear restricting groove 241 and the second sun gear restricting groove 242 ,No longer. Therefore, 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 limiting groove 243 and the end surface 245 of the switching shaft 240 is equal to the distance between the second planetary arm limiting groove 244 and the end surface 245 of the switching shaft 240 . The distance between the end faces 245 of the switching shaft 240 is switched. The distance between the first planetary arm limiting groove 243 and the end face 245 of the switching shaft 240 is smaller than the distance between the first sun gear limiting groove 241 and the end face 245 of the switching shaft 240, and the second planetary arm limiting groove 244 and the first sun gear The confinement grooves 241 are not aligned. Accordingly, 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 , when the switching shaft 240 is rotated, only the sun can be fixed. 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 actuation state of the planetary gear set 300 will be described below, and other details of the driving rod unit 500 will be described later. detail.

Please refer to FIG. 4 together with FIGS. 2 and 3 , wherein FIG. 4 is a schematic cross-sectional view of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . In FIG. 4, the switching shaft 240 is in the first position, at this time, the first pawl 210 is aligned with the first sun gear limiting groove 241, so that the first pawl 210 is separated from the sun gear 310, and the sun gear 310 is The rotation is not restricted; and since the second pawl 220 is not aligned with the first planetary arm limiting groove 243 or the second planetary arm limiting slot 244, the second pawl 220 is engaged with the planetary arm 340, thereby restricting the planetary arm 340 from opposing 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 It rotates to drive the planetary gear 320 . The planetary gear 320 can rotate relative to the planetary arm 340 after being linked, and finally the ring gear 330 and the hub 100 are rotated, which is a push rod driving mode.

Please refer to FIG. 5 together with FIGS. 2 and 3 , wherein FIG. 5 shows another schematic cross-sectional view of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . In FIG. 5, the switching shaft 240 is in the second position, and at this time, the first pawl 210 is aligned with the second sun gear limiting groove 242, so that the first pawl 210 is separated from the sun gear 310, and the sun gear 310 is The rotation is not restricted; and since the second pawl 220 is aligned with the first planetary arm limiting 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 gears 320; at the same time, the motor unit 400 is activated, so that the motor unit 400 drives the planetary gears 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 simultaneously driven by the planetary arm 340 to revolve around the sun gear 310, and finally the ring gear 330 and the hub 100 are rotated, which is a hybrid drive mode, and its speed will be greater than the speed of the push rod drive mode.

Please refer to FIG. 6 , together with FIGS. 2 and 3 , wherein FIG. 6 is another schematic cross-sectional view of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . In FIG. 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 is meshed, thereby restricting the rotation of the sun gear 310 relative to the switching shaft 240; The second planetary arm restricting grooves 244 are 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 activate the motor unit 400, so that the motor unit 400 drives 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 revolutions, this is the motor drive mode, and its speed is greater than the speed of the push rod drive mode, but less than the speed of 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 actuated, the wheel hub 100 can be stopped to have a braking effect.

Please refer to FIG. 7 , which is an exploded schematic view of a driving rod unit 500 of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . It should be noted here that, for the sake of brevity of the drawing, some components of the push rod 520 (the upper rod part 522 , the lower rod part 523 and the quick release seat tube bundle 524 ) and the wireless controller 540 are only shown in FIG. 7 , and is omitted in other figures, but does not limit the present invention. As shown in FIG. 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 . A steering gear 512 is engaged with the main driving gear 511, a second steering gear 513 is engaged with the first steering gear 512, the steering wheel 514 is connected with 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 between a forward position and a rear When the steering wheel 514 is in the forward position, the first steering gear 512 is engaged with the transmission wheel 530 ; when the steering wheel 514 is in the backward position, the second steering gear 513 is engaged with the transmission wheel 530 .

Specifically, the push rod 520 can be operated by the user, and in operation, the purpose of driving the transmission wheel 530 is achieved by continuously pushing and resetting the push rod 520. Therefore, the push rod 520 may include a connecting rod 521, The connecting rod 521 is connected to the main driving gear 511 through the one-way bearing 516 . Therefore, the push rod 520 can only drive the main drive gear 511 in one direction, and the push rod 520 will not drive the main drive gear 511 to rotate when the push rod 520 is reset, so as to avoid reverse rotation and cause the wheelchair to return to the original position and unable to move forward. The push rod 520 can 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 connecting rod 521, the upper rod portion 522 can be sleeved on the lower rod portion 523, the quick release seat The 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 appropriate length of the push rod 520 can be adjusted according to the body shape of different 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 please refer to FIG. 7 , wherein FIG. 8 is a schematic side view of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . The steering wheel assembly 510 may further include a fixed plate 515, one end of the fixed plate 515 is pivoted by the main driving gear 511, and the other end is pivoted by the switching shaft 240, and the fixed plate 515 includes three openings 5151, 5152, 5153, each of which is open. The holes 5151 , 5152 and 5153 are used for the limiting pin 5141 of the steering wheel 514 to limit the position. In Fig. 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, it drives the main drive gear 511 and the first steering gear 512 to drive the transmission wheel. 530, wheelchair can move forward.

Please refer to FIG. 9 , and please refer to FIG. 7 , wherein FIG. 9 is a schematic diagram of another side view of the wheelchair driving structure 10 according to the embodiment of FIG. 1 . The steering wheel 514 is rotated so that the limit pin 5141 is repositioned at the opening 5152. At this time, the steering wheel 514 is in the backward position. After the push rod 520 is pushed, it drives the main drive gear 511, the first steering gear 512, and the second steering gear 513. The wheelchair can move backward by linking the transmission wheel 530.

Please refer to FIG. 10 , wherein FIG. 10 is another schematic side view of the wheelchair driving structure 10 according to the embodiment of 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 FIG. 10 , the steering wheel 514 is rotated so that the limiting pin 5141 is limited to the opening 5153 . Since the first steering gear 512 and the second steering gear 513 are both separated from the transmission wheel 530 , the push rod 520 is pushed. , the transmission wheel 530 will not be linked.

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

As can be seen from the above-mentioned embodiments, the wheelchair driving 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 compression of the ligaments of the user's wrist joints and cause chronic sports injuries, and its labor-saving effect is more suitable for the user to use in more terrain conditions.

2. The wheelchair driving structure has been modularized, and can be directly installed on the pillars of general manual wheelchairs without affecting the folding of the wheelchair, which has the advantage of convenient application.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Anyone skilled in 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 determined by the scope of the appended patent application.

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 tooth

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 Lever Unit

510‧‧‧Steering wheel assembly

520‧‧‧Putter

530‧‧‧Transmission wheel

600‧‧‧ Disc Brake Unit

Claims (8)

A wheelchair driving structure is arranged on a wheel of a wheelchair. The wheelchair driving structure comprises: a hub; a central shaft assembly located in the hub; a planetary gear set located in the hub and comprising: a sun gear, a sleeve set 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 drive rod unit linked to the sun gear and comprising: a transmission wheel connected to the sun gear; a steering wheel assembly, selectively is coupled to the transmission wheel and includes: a main drive gear; a first steering gear engaged with the main drive gear; a second steering gear engaged 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 first steering gear and the second steering gear to displace; and a push rod, connected to the steering wheel assembly, and the main drive The gear is driven to rotate by the push rod; wherein, when the steering wheel assembly is coupled to the transmission wheel, the push rod is actuated to drive the transmission wheel to rotate, and the central shaft assembly is actuated to selectively prevent the sun gear or the planet The arm rotates relative to the central shaft assembly, and the steering wheel is switched between a forward position and a backward position. When the steering wheel is at the forward position, the first steering gear is engaged with the transmission wheel; when the steering wheel is at the forward position, the first steering gear is engaged with the transmission wheel; In the backward position, the second steering gear is engaged with the transmission wheel. The wheelchair drive structure as described in claim 1, wherein the central shaft assembly comprises: a main shaft including a sleeve part, and the sleeve part includes two openings arranged at intervals; a switch shaft rotatably inserted in the sleeve portion; a first pawl movably located in one of the openings and selectively coupled to the sun gear; and a second pawl movably located in the other opening and selected is sexually coupled to the planetary arm; When the switching shaft is actuated to couple the first pawl with the sun gear, it prevents the sun gear from rotating relative to the central shaft assembly; when the switching shaft is actuated to couple the second pawl with the planetary arm, it prevents the sun gear from rotating relative to the central shaft assembly. The planetary arm rotates relative to the central shaft assembly. The wheelchair driving structure according to claim 2, wherein the switching shaft comprises: a first sun gear restricting groove; a second sun gear restricting groove adjacent to the first sun gear restricting groove; a first sun gear restricting groove a planetary arm limiting groove arranged along an axial direction of the switching shaft with the second sun gear limiting groove; and a second planetary arm limiting groove adjacent to the first planetary arm limiting groove; wherein the switching shaft is It operates 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 limiting groove, so that the first A pawl is separated from the sun gear, at this time only the drive lever 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, the first pawl and the second sun gear The restriction groove is aligned and the second pawl is aligned with the first planetary arm restriction slot, so that the first pawl is separated from the sun gear, and the second pawl is separated from the planetary arm. At this time, it is allowed to The motor unit drives the planetary arm and allows the drive rod unit to drive the sun gear The wheel rotates relative to the central shaft assembly; when the switching shaft is at the third position, the second pawl is aligned with the second planetary arm limiting groove, so that the second pawl is separated 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 driving structure according to claim 1, wherein the motor unit comprises: a reduction gear set linked with the planetary arm; and a hub motor connected to drive the reduction gear set. The wheelchair driving structure of claim 1, wherein the steering wheel is further switched to a neutral position, and when the steering wheel is in the neutral position, the first steering gear and the second steering gear are both separate from the drive wheel. The wheelchair driving structure according to claim 1, wherein the push rod includes a one-way bearing, and the one-way bearing is pivotally connected to the main driving gear. The wheelchair driving structure as described in claim 1 further includes a disc brake unit coupled to the wheel hub. The wheelchair driving structure as described in claim 1, wherein the driving rod unit comprises: a wireless controller for opening and closing the motor unit.

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