阅读说明：本技术 一种无极调节传动比的手动轮椅 (Manual wheelchair capable of stepless adjusting transmission ratio ) 是由 李晨 王志强 林林 刘绍卿 于 2020-05-28 设计创作，主要内容包括：本发明公开了一种无极调节传动比的手动轮椅。现有的手动轮椅爬坡十分费力；本发明包括椅架、手摇车轮组件和无级变速器。两个手摇车轮组件分别设置在椅架底部的两侧。手摇车轮组件包括主车轮、手轮圈、管状轮轴和驱动转轴。管状轮轴支承在椅架底部。主车轮与管状轮轴的外端固定。驱动转轴与管状轮轴同轴设置,并构成转动副。手轮圈与驱动转轴的外端固定。所述的无级变速器共有两个。两个无级变速器与两个手摇车轮组件分别对应,实现驱动转轴与管状轮轴的传动比的无极调节。本发明将现有技术中固定在一起的车轮和手轮圈分离为相互转动,并通过设置无级变速器来调节车轮与手轮圈的传动比,便于使用者根据自身的力量大小和当前的路况调节传动比。(The invention discloses a manual wheelchair capable of steplessly adjusting transmission ratio. The climbing of the existing manual wheelchair is very laborious; the invention comprises a chair frame, a hand-operated wheel assembly and a stepless speed changer. Two hand-operated wheel assemblies are respectively arranged at two sides of the bottom of the chair frame. The hand-operated wheel assembly comprises a main wheel, a hand wheel ring, a tubular wheel shaft and a driving rotating shaft. The tubular wheel axle is supported at the bottom of the chair frame. The main wheel is fixed with the outer end of the tubular wheel shaft. The driving rotating shaft and the tubular wheel shaft are coaxially arranged and form a rotating pair. The hand wheel ring is fixed with the outer end of the driving rotating shaft. The continuously variable transmission comprises two continuously variable transmissions. The two stepless speed changers correspond to the two hand-operated wheel assemblies respectively, and stepless adjustment of the transmission ratio of the driving rotating shaft and the tubular wheel shaft is achieved. The invention separates the wheel and the hand rim which are fixed together in the prior art into mutual rotation, and adjusts the transmission ratio of the wheel and the hand rim by arranging the stepless speed changer, thereby facilitating a user to adjust the transmission ratio according to the strength of the user and the current road condition.)

1. A manual wheelchair capable of steplessly adjusting transmission ratio comprises a chair frame, a hand-operated wheel assembly and a stepless speed changer; the method is characterized in that: the two hand-operated wheel assemblies are respectively arranged on two sides of the bottom of the chair frame; the hand-operated wheel assembly comprises a main wheel, a hand wheel ring, a tubular wheel shaft and a driving rotating shaft; the tubular wheel shaft is supported at the bottom of the chair frame; the main wheel is fixed with the outer end of the tubular wheel shaft; the driving rotating shaft and the tubular wheel shaft are coaxially arranged and form a rotating pair; the hand wheel rim is fixed with the outer end of the driving rotating shaft; the number of the continuously variable transmissions is two; the two stepless speed changers correspond to the two hand-operated wheel assemblies respectively and are connected with the tubular wheel shafts and the driving rotating shafts in the corresponding hand-operated wheel assemblies, so that stepless adjustment of the transmission ratio of the driving rotating shafts and the tubular wheel shafts is realized.

2. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: the continuously variable transmission comprises a driving wheel, a transmission shaft, a driven wheel, a spring and a transmission belt; the transmission shaft is supported at the bottom of the chair frame; the transmission shaft is in transmission connection with the tubular wheel shaft; the driving wheels are arranged on the corresponding driving rotating shafts; the driven wheel is arranged on the transmission shaft; the driving wheel and the driven wheel have the same structure and respectively comprise two conical unilateral wheels; the two conical single-side wheels are arranged oppositely and at intervals, and the opposite surfaces are in a circular truncated cone surface shape; the distance between the two conical unilateral wheels is adjustable.

3. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: one of the conical unilateral wheels of the driving wheel is fixed with the driving rotating shaft, and the other conical unilateral wheel and the driving rotating shaft form a sliding pair; one of the conical single-side wheels of the driven wheels is fixed with the transmission shaft, and the other conical single-side wheel and the transmission shaft form a sliding pair; the driving belt is connected with the driving wheel and the driven wheel; the driving wheel and the driven wheel are provided with a sliding conical unilateral wheel on the opposite side; the driving rotating shaft is sleeved with a spring; one end of the spring is fixed with the driving rotating shaft, and the other end of the spring is propped against the outer side face of the conical unilateral wheel which can slide in the driving wheel.

4. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: the invention relates to a manual wheelchair capable of steplessly adjusting the transmission ratio, which also comprises an adjusting transmission component; the adjusting transmission assembly comprises an adjusting rotating shaft, a sliding block and a connecting rod; the horizontally arranged adjusting rotating shaft is supported at the bottom of the chair frame; two sections of threads with opposite rotation directions are arranged on the adjusting rotating shaft; nuts are fixed on the two sliding blocks; two nuts and two sections of threads with opposite rotating directions on the adjusting rotating shaft respectively form a screw pair; one end of each connecting rod is fixed with each sliding block; the other ends of the two connecting rods are fixed with variable-speed pushing rings; the two variable-speed pushing rings and the two driving rotating shafts respectively form a cylindrical pair; the two variable-speed pushing rings are respectively abutted against the tapered unilateral wheel which can slide in the two driven wheels.

5. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: two conical unilateral wheels of the driving wheel and the driving rotating shaft form a sliding pair; two conical unilateral wheels of the driven wheel and the transmission shaft form a sliding pair; each driving rotating shaft is sleeved with two springs; the back ends of the two springs are fixed with the driving rotating shaft, and the other ends of the two springs respectively abut against the back side faces of the driving wheel.

6. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: the invention relates to a manual wheelchair capable of steplessly adjusting the transmission ratio, which also comprises an adjusting transmission component; the adjusting transmission assembly comprises an adjusting rotating shaft, a sliding block and a connecting rod; the horizontally arranged adjusting rotating shaft is supported at the bottom of the chair frame; four sections of threads which are sequentially arranged are arranged on the adjusting rotating shaft; any two adjacent sections of threads have opposite rotating directions; the number of the sliding blocks is four; nuts are fixed on the four sliding blocks; the four nuts and the four sections of threads on the adjusting rotating shaft respectively form a screw pair; the four sliding blocks are grouped in pairs and divided into two sliding block groups; the symmetrical surfaces of the two sliding block groups are superposed with the symmetrical surfaces of the two continuously variable transmissions; one end of each connecting rod is fixed with each of the four sliding blocks; the other ends of the four connecting rods are all fixed with variable-speed pushing rings; the two variable-speed push rings in the same group and the corresponding driving rotating shaft form a cylindrical pair; the two variable-speed push rings in the same group respectively abut against two side surfaces of the corresponding driven wheel.

7. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: the invention relates to a manual wheelchair for stepless adjusting transmission ratio, which also comprises a speed adjusting handle; the adjusting transmission component also comprises a bevel gear; the speed regulating handle is arranged at one armrest of the chair frame and forms a revolute pair with the chair frame, and the revolute pair and the chair frame are vertically arranged on a common axis; the two bevel gears are respectively fixed with the bottom end of the speed regulating handle and one end of the regulating rotating shaft; the two bevel gears mesh.

8. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: and a plane bearing is arranged between the variable-speed pushing ring and the corresponding driving wheel.

9. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: the hand wheel ring is positioned on the outer side of the wheel.

10. The hand-operated wheelchair for stepless adjustment of transmission ratio as claimed in claim 1, wherein: the invention relates to a manual wheelchair for stepless adjustment of transmission ratio, which also comprises an auxiliary wheel; the auxiliary wheel adopts a universal wheel and is arranged at the bottom of the chair frame.

Technical Field

The invention belongs to the technical field of manual wheelchairs, and particularly relates to a manual wheelchair capable of adjusting a transmission ratio steplessly.

Background

According to the statistical data of world banks, China has been the tenth place of the leaderboard of the aged population in 2019, the percentage of the aged population is up to 11%, the number of the aged population is up to 2.46 hundred million, and the number of the aged population with disability and half disability is up to 4000 ten thousand. In order to improve the convenience of the wheelchair, the electric wheelchair is invented at present, the operation of a wheelchair user is more convenient, the problem of climbing is solved, and a lot of strength is saved for the user.

However, the price of the electric wheelchair is not equal to 2000 to 10000, which is about 3 times of that of the common wheelchair. Some wheelchair users do not need to have the necessity for the electric wheelchair, but when using the wheelchair to climb the slope, the wheelchair users are very arduous, so that the problem of climbing the slope by spending 3 times of the price is solved. At present, an invention patent for dealing with the situation is born, for example, patent No. cn201520004697.x, which applies a ratchet chain type speed changer and can realize speed change like a speed change bicycle, however, the chain type ratchet speed changer has the biggest defect that a chain is easy to drop, the quality required for a chain is high, the speed change effect is reduced along with time, and the problem of speed drop of the maximum gear and the minimum gear occurs.

Disclosure of Invention

The invention aims to provide a manual wheelchair capable of steplessly adjusting transmission ratio.

The invention relates to a manual wheelchair capable of steplessly adjusting transmission ratio, which comprises a chair frame, a hand-operated wheel assembly and a stepless speed changer. Two hand-operated wheel assemblies are respectively arranged at two sides of the bottom of the chair frame. The hand-operated wheel assembly comprises a main wheel, a hand wheel ring, a tubular wheel shaft and a driving rotating shaft. The tubular wheel axle is supported at the bottom of the chair frame. The main wheel is fixed with the outer end of the tubular wheel shaft. The driving rotating shaft and the tubular wheel shaft are coaxially arranged and form a rotating pair. The hand wheel ring is fixed with the outer end of the driving rotating shaft. The continuously variable transmission comprises two continuously variable transmissions. The two stepless speed changers correspond to the two hand-operated wheel assemblies respectively and are connected with the tubular wheel shafts and the driving rotating shafts in the corresponding hand-operated wheel assemblies, so that stepless adjustment of the transmission ratio of the driving rotating shafts and the tubular wheel shafts is realized.

Preferably, the continuously variable transmission comprises a driving wheel, a transmission shaft, a driven wheel, a spring and a transmission belt. The transmission shaft is supported at the bottom of the chair frame. The transmission shaft is in transmission connection with the tubular wheel shaft. The driving wheels are arranged on the corresponding driving rotating shafts; the driven wheel is arranged on the transmission shaft. The driving wheel and the driven wheel have the same structure and respectively comprise two conical unilateral wheels; two toper unilateral wheels are relative and interval setting, and the opposite face all is the round platform face-like. The distance between the two conical unilateral wheels is adjustable.

Preferably, one of the tapered single-side wheels of the driving wheel is fixed with the driving rotating shaft, and the other tapered single-side wheel and the driving rotating shaft form a sliding pair. One of the conical unilateral wheels of the driven wheel is fixed with the transmission shaft, and the other conical unilateral wheel and the transmission shaft form a sliding pair. The driving belt is connected with the driving wheel and the driven wheel; the driving wheel and the driven wheel are provided with a sliding conical unilateral wheel on the opposite side. The driving rotating shaft is sleeved with a spring; one end of the spring is fixed with the driving rotating shaft, and the other end of the spring is propped against the outer side face of the conical unilateral wheel which can slide in the driving wheel.

Preferably, the manual wheelchair for stepless adjustment of the transmission ratio further comprises an adjustment transmission assembly. The adjusting transmission component comprises an adjusting rotating shaft, a sliding block and a connecting rod. The horizontally arranged adjusting rotating shaft is supported at the bottom of the chair frame. Two sections of threads with opposite rotation directions are arranged on the adjusting rotating shaft. And nuts are fixed on the two sliding blocks. Two nuts and two sections of threads on the adjusting rotating shaft in opposite directions respectively form a screw pair. One end of each connecting rod is fixed with each sliding block. The other ends of the two connecting rods are fixed with variable-speed pushing rings. The two variable-speed pushing rings and the two driving rotating shafts respectively form a cylindrical pair. The two variable-speed pushing rings are respectively abutted against the tapered unilateral wheel which can slide in the two driven wheels.

Preferably, the two conical unilateral wheels of the driving wheel and the driving rotating shaft form a sliding pair. Two conical unilateral wheels of the driven wheel and the transmission shaft form a sliding pair. Each driving rotating shaft is sleeved with two springs; the back ends of the two springs are fixed with the driving rotating shaft, and the other ends of the two springs respectively abut against the back side faces of the driving wheel.

Preferably, the manual wheelchair for stepless adjustment of the transmission ratio further comprises an adjustment transmission assembly. The adjusting transmission component comprises an adjusting rotating shaft, a sliding block and a connecting rod. The horizontally arranged adjusting rotating shaft is supported at the bottom of the chair frame. Four sections of threads which are arranged in sequence are arranged on the adjusting rotating shaft. Any two adjacent sections of threads are opposite in turning direction. The number of the sliding blocks is four; and nuts are fixed on the four sliding blocks. The four nuts and the four sections of threads on the adjusting rotating shaft respectively form a screw pair. The four sliding blocks are grouped into two sliding block groups in pairs. The symmetry planes of the two sliding block groups coincide with the symmetry planes of the two continuously variable transmissions. One end of each connecting rod is fixed with each sliding block. The other ends of the four connecting rods are all fixed with variable-speed pushing rings. The two variable-speed push rings in the same group and the corresponding driving rotating shaft form a cylindrical pair. The two variable-speed push rings in the same group respectively abut against two side surfaces of the corresponding driven wheel.

Preferably, the manual wheelchair for stepless adjustment of the transmission ratio further comprises a speed adjusting handle. The adjusting transmission component also comprises a bevel gear. The speed regulating handle is arranged at one armrest of the chair frame and forms a revolute pair with the chair frame, and the revolute pair and the chair frame are vertically arranged on a common axis. The two bevel gears are respectively fixed with the bottom end of the speed regulating handle and one end of the regulating rotating shaft. The two bevel gears mesh.

Preferably, a flat bearing is provided between the variable speed thrust ring and the corresponding drive wheel.

Preferably, the hand rim is located on the outer side of the wheel.

Preferably, the manual wheelchair for stepless adjustment of the transmission ratio further comprises an auxiliary wheel. The auxiliary wheel adopts a universal wheel and is arranged at the bottom of the chair frame.

The invention has the beneficial effects that:

1. the invention separates the wheel and the hand rim which are fixed together in the prior art into mutual rotation, and adjusts the transmission ratio of the wheel and the hand rim by arranging the stepless speed changer, thereby facilitating a user to adjust the transmission ratio according to the strength of the user and the current road condition.

2. The invention can effectively solve the problem that a user is hard to climb the slope, and brings great convenience to the elderly and the disabled. Because the stepless speed change principle is used, the chain structure is not arranged in the structure, and the problem of chain falling does not exist.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

FIG. 2 is a schematic top view of a hidden chair frame according to embodiment 1 of the invention;

fig. 3 is an assembly view of the continuously variable transmission and the adjusting transmission assembly according to embodiment 1 of the present invention.

FIG. 4 is a schematic top view of a hidden chair frame according to embodiment 2 of the invention;

Detailed Description

The invention is further described below with reference to the accompanying drawings.