CN108749989A - A kind of rear-mounted bicycle with pedal - Google Patents
A kind of rear-mounted bicycle with pedal Download PDFInfo
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- CN108749989A CN108749989A CN201810949766.2A CN201810949766A CN108749989A CN 108749989 A CN108749989 A CN 108749989A CN 201810949766 A CN201810949766 A CN 201810949766A CN 108749989 A CN108749989 A CN 108749989A
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- 238000005491 wire drawing Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 3
- 210000000689 upper leg Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M1/00—Rider propulsion of wheeled vehicles
- B62M1/24—Rider propulsion of wheeled vehicles with reciprocating levers, e.g. foot levers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
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Abstract
本发明公开了一种后置式踏板自行车，包括车架、前叉、前轮、后轮和车把；后轮左右两侧分别设置有第一飞轮和第二飞轮，车架左右两侧分别铰接有第一踏板和第二踏板；车架上可转动地设置有第一转轮第二转轮和第三转轮；第一飞轮上绕设有第一链条，第二飞轮上绕设有第二链条；第一链条的下端头连接有第一拉丝的一端，第一拉丝绕过第一转轮，第一拉丝的另一端连接第二链条的下端头；第一链条的上端头连接有第二拉丝的一端，第二拉丝绕过第二转轮，第二拉丝的另一端连接在第一踏板上；第二链条的上端头连接有第三拉丝的一端，第三拉丝绕过第三转轮，第三拉丝的另一端连接在第二踏板上。本发明踩踏更加平顺、协调，力转化效率高。
The invention discloses a rear-mounted pedal bicycle, which comprises a vehicle frame, a front fork, a front wheel, a rear wheel and a handlebar; the left and right sides of the rear wheel are respectively provided with a first flywheel and a second flywheel, and the left and right sides of the vehicle frame are respectively hinged There are a first pedal and a second pedal; the frame is rotatably provided with a first runner, a second runner and a third runner; the first flywheel is wound with a first chain, and the second flywheel is wound with a second Two chains; the lower end of the first chain is connected with one end of the first drawing wire, the first drawing wire walks around the first runner, and the other end of the first drawing wire is connected with the lower end of the second chain; the upper end of the first chain is connected with the first drawing wire One end of the second wire, the second wire goes around the second wheel, the other end of the second wire is connected to the first pedal; the upper end of the second chain is connected to one end of the third wire, and the third wire goes around the third turn Wheel, the other end of the third wire drawing is connected on the second pedal. The treading of the invention is smoother and more coordinated, and the force conversion efficiency is high.
Description
技术领域technical field
本发明涉及自行车领域，尤其涉及一种后置式踏板自行车。The invention relates to the field of bicycles, in particular to a rear-mounted pedal bicycle.
背景技术Background technique
现有的自行车传动装置存在以下不足：其一是扭力转换效率不高。现有自行车在骑行时，当曲柄呈水平状态时，人踩脚蹬的力量能使牙盘输出最大扭力；当曲柄越过水平状态后，用同等力量踩踏脚蹬，牙盘输出的扭力小于曲柄呈水平时的最大值；当曲柄呈垂直状态，人踩脚蹬的力量方向与中轴圆心重叠，此时用力踩脚蹬，牙盘却无扭力输出，因此，现有传动装置不能将垂直方向的踩踏力最大限度的转换成旋转扭力。其二是驱动力不足。现有自行车采用坐姿骑行，自行车座椅承载了人体的主要重量，自行车的驱动力主要靠人大腿肌肉收缩产生动力，只有人大腿用力踩脚蹬时，牙盘才输出扭力驱动自行车，在人大腿不用力时，牙盘也无扭力输出，人体的重力势能并未产生相应的驱动扭力，所以驱动自行车的扭力不够大。There are following deficiencies in the existing bicycle transmission: one is that the torque conversion efficiency is not high. When the existing bicycle is riding, when the crank is in a horizontal state, the power of the person stepping on the pedals can make the crankshaft output the maximum torque; The maximum value when the crank is in the vertical state; when the crank is in the vertical state, the force direction of the person stepping on the pedal overlaps with the center of the central axis. At this time, the crankshaft has no torque output when the pedal is stepped on hard. Therefore, the existing transmission device cannot adjust the vertical direction The maximum pedaling force is converted into rotational torque. The second is insufficient driving force. Existing bicycles are ridden in a sitting position. The bicycle seat bears the main weight of the human body. The driving force of the bicycle is mainly generated by the contraction of the human thigh muscles. When the thigh is not exerting force, the crankset has no torque output, and the gravitational potential energy of the human body does not produce the corresponding driving torque, so the torque driving the bicycle is not large enough.
所以，现在人们开始研究后置式踏板自行车，使上下踏动的动力转化为自行车前进的动力。但现有的后置式踏板自行车存在结构不合理，力转换效率低，踏动不协调等问题。So, now people start to study rear-mounted pedal bicycles, so that the power of stepping up and down is converted into the power of bicycle advancement. However, the existing rear-mounted pedal bicycles have problems such as unreasonable structure, low power conversion efficiency, uncoordinated pedaling and the like.
发明内容Contents of the invention
本发明的目的是提供一种后置式踏板自行车，解决现有后置式踏板自行车结构不合理，力转换效率低，踏动不协调的问题。The purpose of the present invention is to provide a rear-mounted pedal bicycle, which solves the problems of unreasonable structure, low force conversion efficiency and uncoordinated pedaling of the existing rear-mounted pedal bicycle.
为解决上述技术问题，本发明采用如下技术方案：In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:
本发明一种后置式踏板自行车，包括车架、前叉、前轮、后轮和车把，所述前叉设置在所述车架前侧，所述车把设置在前叉上端，所述前轮设置在前叉下端，所述后轮设置在所述车架后侧；所述后轮左右两侧分别设置有第一飞轮和第二飞轮，所述车架左右两侧分别铰接有第一踏板和第二踏板，所述第一踏板和第二踏板的后端铰接在车架后侧，第一踏板和第二踏板的前端向车架前方延伸；所述车架的下方可转动地设置有第一转轮，车架上侧可转动地设置有第二转轮和第三转轮；所述第二转轮和第三转轮对立设置，且第二转轮的转动面与第一飞轮的转动面相同，且第三转轮的转动面与第二飞轮的转动面相同；所述第一飞轮上绕设有第一链条，所述第二飞轮上绕设有第二链条；所述第一链条的下端头连接有第一拉丝的一端，所述第一拉丝绕过第一转轮，第一拉丝的另一端连接所述第二链条的下端头；所述第一链条的上端头连接有第二拉丝的一端，所述第二拉丝绕过所述第二转轮，第二拉丝的另一端连接在所述第一踏板上；所述第二链条的上端头连接有第三拉丝的一端，所述第三拉丝绕过所述第三转轮，第三拉丝的另一端连接在所述第二踏板上。A rear-mounted pedal bicycle of the present invention comprises a vehicle frame, a front fork, a front wheel, a rear wheel and a handlebar, the front fork is arranged on the front side of the vehicle frame, the handlebar is arranged on the upper end of the front fork, and the The front wheel is arranged at the lower end of the front fork, and the rear wheel is arranged at the rear side of the vehicle frame; the left and right sides of the rear wheel are respectively provided with a first flywheel and a second flywheel, and the left and right sides of the vehicle frame are respectively hinged with a second flywheel. A pedal and a second pedal, the rear ends of the first pedal and the second pedal are hinged on the rear side of the frame, and the front ends of the first pedal and the second pedal extend to the front of the frame; the bottom of the frame is rotatable A first runner is provided, and a second runner and a third runner are rotatably arranged on the upper side of the vehicle frame; The rotating surface of the first flywheel is the same, and the rotating surface of the third rotating wheel is the same as the rotating surface of the second flywheel; a first chain is wound around the first flywheel, and a second chain is wound around the second flywheel; The lower end of the first chain is connected with one end of the first drawing wire, the first drawing wire bypasses the first runner, and the other end of the first drawing wire is connected with the lower end of the second chain; One end of the second drawing wire is connected to the upper end, the second drawing wire goes around the second runner, and the other end of the second drawing wire is connected to the first pedal; the upper end of the second chain is connected to the first One end of the three wires, the third wire bypasses the third wheel, and the other end of the third wire is connected to the second pedal.
进一步的，所述第一踏板和第二踏板在所述车架上的铰接轴位于所述第一飞轮和第二飞轮的转动轴后侧再进一步的，所述车架上设置有第四转轮，所述第二拉丝位于第一链条与第二转轮之间的部分从所述第四转轮的一侧通过，所述第三拉丝位于第二链条与第三转轮之间的部分从所述第四转轮的另一侧通过。Further, the hinge shaft of the first pedal and the second pedal on the frame is located at the rear side of the rotation shaft of the first flywheel and the second flywheel, and further, the frame is provided with a fourth rotation The part of the second drawing wire between the first chain and the second runner passes through one side of the fourth runner, and the part of the third drawing wire located between the second chain and the third runner Pass on the other side of the fourth wheel.
再进一步的，第二转轮和第三转轮同轴转动。Still further, the second runner and the third runner rotate coaxially.
再进一步的，所述第一转轮的转动面呈水平状态。Still further, the rotating surface of the first rotating wheel is in a horizontal state.
再进一步的，所述第一踏板和第二踏板上均设置有脚踏垫。Still further, foot pads are provided on the first pedal and the second pedal.
再进一步的，所述第一拉丝、第二拉丝和第三拉丝均为钢丝绳。Still further, the first drawing wire, the second drawing wire and the third drawing wire are all steel wire ropes.
再进一步的，所述车架上设置有车座。Still further, the vehicle frame is provided with a vehicle seat.
与现有技术相比，本发明的有益技术效果如下：Compared with the prior art, the beneficial technical effects of the present invention are as follows:
本发明的第一踏板向下踏时，带动第二拉丝的下端头向下移动，经过第二转轮和第二拉丝改变力的传导方向，使第二拉丝拉动第一链条的上端头向上运动，驱动第一飞轮向前转动，进而使后轮向前滚动，与此同时，第一链条的上端头向上运动时，第一链条的下端头向右运动，通过第一拉丝和第一转轮改变力的传导方向，使第二链条的下端头向左移动，进而第二链条的上端头向下运动，并通过第三拉丝和第三转轮改变力的传导方向，使第二踏板向上旋转，反之亦然；第一飞轮和第二飞轮任意一个向前转动都能带动后轮向前滚动，如此第一踏板和第二踏板交替上下运动，后轮持续向前滚动；第一转轮、第一飞轮、第二转轮或第一转轮、第二飞轮、第三转轮三个力的交汇点形成一个三角形，没有力的死点，踩踏更加平顺、协调，力转化效率高；且经过第一转轮和第一拉丝的拉扯作用，是第一脚踏板和第二脚踏板的协调性更好。When the first pedal of the present invention is stepped down, the lower end of the second wire is driven to move downward, and the transmission direction of the force is changed through the second runner and the second wire, so that the second wire pulls the upper end of the first chain to move upward. , to drive the first flywheel to rotate forward, and then to make the rear wheel roll forward. Change the transmission direction of the force, so that the lower end of the second chain moves to the left, and then the upper end of the second chain moves downward, and change the transmission direction of the force through the third wire drawing and the third runner, so that the second pedal rotates upward , and vice versa; any forward rotation of the first flywheel and the second flywheel can drive the rear wheel to roll forward, so that the first pedal and the second pedal move up and down alternately, and the rear wheel continues to roll forward; the first wheel, The first flywheel, the second runner or the intersection point of the first runner, the second flywheel, and the third runner form a triangle, there is no dead point of force, the pedaling is smoother and more coordinated, and the force conversion efficiency is high; and Through the pulling effect of the first runner and the first wire drawing, the coordination between the first pedal and the second pedal is better.
附图说明Description of drawings
下面结合附图说明对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings.
图1为本发明后置式踏板自行车结构示意图；Fig. 1 is the structure schematic diagram of rear-mounted pedal bicycle of the present invention;
附图标记说明：1、车架；2、前叉；3、前轮；4、后轮；5、车把；6、第一飞轮；7、第二飞轮；8、第一踏板；9、第二踏板；10、第一转轮；11、第二转轮；12、第三转轮；13、第一链条；14、第二链条；15、第一拉丝；16、第二拉丝；17、第三拉丝；18、第四转轮；19、脚踏垫；20、车座。Description of reference signs: 1, vehicle frame; 2, front fork; 3, front wheel; 4, rear wheel; 5, handlebar; 6, first flywheel; 7, second flywheel; 8, first pedal; 9, The second pedal; 10, the first runner; 11, the second runner; 12, the third runner; 13, the first chain; 14, the second chain; 15, the first drawing; 16, the second drawing; 17 , the third drawing; 18, the fourth runner; 19, the foot pad; 20, the seat.
具体实施方式Detailed ways
如图1所示，一种后置式踏板自行车的具体实施例，包括车架1、前叉2、前轮3、后轮4和车把5，所述前叉2安装在所述车架1前侧，所述车把5安装在前叉2上端，所述前轮3安装在前叉2下端，由车把控制前轮的转向，所述后轮4安装在所述车架1后侧，形成整个的移动装置，这与现有技术相同。As shown in Figure 1, a specific embodiment of a rear-mounted pedal bicycle includes a vehicle frame 1, a front fork 2, a front wheel 3, a rear wheel 4 and a handlebar 5, and the front fork 2 is installed on the vehicle frame 1 On the front side, the handlebar 5 is installed on the upper end of the front fork 2, the front wheel 3 is installed on the lower end of the front fork 2, the steering of the front wheel is controlled by the handlebar, and the rear wheel 4 is installed on the rear side of the vehicle frame 1 , forming the whole mobile device, which is the same as the prior art.
本具体实施例所特有的是，所述后轮4左右两侧分别安装有第一飞轮6和第二飞轮7(图1中未示出)，第一飞轮和第二飞轮在正转时带动后轮向前转动，第一飞轮和第二飞轮在反转时不会对后轮产生力的作用，不影响后轮继续向前转动。所述车架1左右两侧分别用铰接轴铰接有第一踏板8和第二踏板9，第一踏板8和第二踏板9的铰接位置对称，分别位于车架左右两侧。所述第一踏板8和第二踏板9的后端铰接在车架1后侧，第一踏板8和第二踏板9的前端向车架1前方延伸，且所述第一踏板8和第二踏板9在所述车架1上的铰接轴位于所述第一飞轮6和第二飞轮7的转动轴后侧，使第一踏板和第二踏板可延伸的长度更长，踩踏力矩更大，脚踏更加省力。What is unique to this specific embodiment is that a first flywheel 6 and a second flywheel 7 (not shown in FIG. 1 ) are respectively installed on the left and right sides of the rear wheel 4, and the first flywheel and the second flywheel drive The rear wheel rotates forward, and the first flywheel and the second flywheel will not produce the effect of force on the rear wheel when they are reversed, and the continuous forward rotation of the rear wheel will not be affected. The left and right sides of the vehicle frame 1 are respectively hinged with a first pedal 8 and a second pedal 9 by means of hinge shafts. The hinged positions of the first pedal 8 and the second pedal 9 are symmetrical, and are respectively located on the left and right sides of the vehicle frame. The rear ends of the first pedal 8 and the second pedal 9 are hinged on the rear side of the vehicle frame 1, and the front ends of the first pedal 8 and the second pedal 9 extend toward the front of the vehicle frame 1, and the first pedal 8 and the second pedal The hinge shaft of the pedal 9 on the vehicle frame 1 is located at the rear side of the rotation shaft of the first flywheel 6 and the second flywheel 7, so that the extendable length of the first pedal and the second pedal is longer, and the pedaling moment is larger. The pedal is more labor-saving.
所述车架1的下方安装有可水平转动的第一转轮10，所述第一转轮10的转动面呈水平状态。车架1上侧安装有可竖直转动的第二转轮11和第三转轮12(图1中未示出)，所述第二转轮11和第三转轮12对立设置，第二转轮和第三转轮可安装在同一轴上，使所述第二转轮11和第三转轮12同轴转动。本具体实施例中，第二转轮11的转动面与第一飞轮6的转动面相同，且第三转轮12的转动面与第二飞轮7的转动面相同。所述第一飞轮6上绕设有第一链条13，所述第二飞轮7上绕设有第二链条14(图1中未示出)。所述第一链条13的下端头固定连接有第一拉丝15的一端，所述第一拉丝15从左侧绕过第一转轮10，第一拉丝15的另一端固定连接所述第二链条14的下端头。所述第一链条13的上端头固定连接有第二拉丝16的一端，所述第二拉丝16从上侧绕过所述第二转轮11，第二拉丝16的另一端固定连接在所述第一踏板8的前侧；所述第二链条14的上端头固定连接有第三拉丝17的一端，所述第三拉丝17从上侧绕过所述第三转轮12，第三拉丝17的另一端连接在所述第二踏板9的前侧。当第一踏板向下踏时，带动第二拉丝的下端头向下移动，经过第二转轮改变力的传导方向，使第二拉丝拉动第一链条的上端头向上运动，驱动第一飞轮向前转动，进而使后轮向前滚动；与此同时，第一链条的上端头向上运动时，第一链条的下端头向右运动，通过第一拉丝和第一转轮改变力的传导方向，使第二链条的下端头向左移动，进而第二链条的上端头向下运动，并通过第三拉丝和第三转轮改变力的传导方向，使第二踏板向上旋转。反之，当第二踏板向下踏时，带动第三拉丝的下端头向下移动，经过第三转轮改变力的传导方向，使第三拉丝拉动第二链条的上端头向上运动，驱动第二飞轮向前转动，进而使后轮向前滚动；与此同时，第二链条的上端头向上运动时，第二链条的下端头向右运动，通过第一拉丝和第一转轮改变力的传导方向，使第一链条的下端头向左移动，进而第一链条的上端头向下运动，并通过第二拉丝和第二转轮改变力的传导方向，使第二踏板向上旋转。如此反复踏动第一踏板和第二踏板，使本后置式踏板自行车源源不断地向前运动。A horizontally rotatable first runner 10 is installed below the vehicle frame 1 , and the rotating surface of the first runner 10 is in a horizontal state. Vertically rotatable second runner 11 and third runner 12 (not shown in Fig. 1) are installed on vehicle frame 1 upper side, described second runner 11 and third runner 12 are oppositely arranged, and the second The runner and the third runner can be installed on the same shaft, so that the second runner 11 and the third runner 12 can rotate coaxially. In this specific embodiment, the rotation surface of the second runner 11 is the same as that of the first flywheel 6 , and the rotation surface of the third runner 12 is the same as that of the second flywheel 7 . A first chain 13 is wound around the first flywheel 6 , and a second chain 14 (not shown in FIG. 1 ) is wound around the second flywheel 7 . The lower end of the first chain 13 is fixedly connected with one end of the first drawing wire 15, the first drawing wire 15 bypasses the first runner 10 from the left side, and the other end of the first drawing wire 15 is fixedly connected with the second chain 14 lower ends. The upper end of the first chain 13 is fixedly connected with one end of the second drawing wire 16, the second drawing wire 16 bypasses the second runner 11 from the upper side, and the other end of the second drawing wire 16 is fixedly connected to the The front side of the first pedal 8; the upper end of the second chain 14 is fixedly connected with an end of the third drawing wire 17, and the third drawing wire 17 walks around the third runner 12 from the upper side, and the third drawing wire 17 The other end of is connected to the front side of the second pedal 9. When the first pedal is stepped down, it drives the lower end of the second drawing wire to move downward, and changes the direction of force transmission through the second runner, so that the second drawing wire pulls the upper end of the first chain to move upward, driving the first flywheel to move upward. At the same time, when the upper end of the first chain moves upward, the lower end of the first chain moves to the right, and the transmission direction of the force is changed through the first wire drawing and the first runner. The lower end of the second chain is moved to the left, and then the upper end of the second chain moves downward, and the transmission direction of the force is changed by the third wire drawing and the third runner, so that the second pedal is rotated upward. Conversely, when the second pedal is stepped down, it drives the lower end of the third wire to move downward, and changes the direction of force transmission through the third wheel, so that the third wire pulls the upper end of the second chain to move upward, driving the second chain. The flywheel rotates forward, and the rear wheel rolls forward; at the same time, when the upper end of the second chain moves upward, the lower end of the second chain moves to the right, and the force transmission is changed through the first wire drawing and the first runner. Direction, the lower end of the first chain is moved to the left, and then the upper end of the first chain moves downward, and the transmission direction of the force is changed by the second wire drawing and the second runner, so that the second pedal is rotated upward. Stepping the first pedal and the second pedal repeatedly in this way makes the rear-mounted pedal bicycle move forward continuously.
所述车架1上还安装有第四转轮18，所述第二拉丝16位于第一链条13与第二转轮11之间的部分从所述第四转轮18的一侧通过，所述第三拉丝17位于第二链条14与第三转轮12之间的部分从所述第四转轮18的另一侧通过，使第二拉丝和第三拉丝之间保持间距，避免相互缠绕或间隔太小摩擦到后轮。A fourth runner 18 is also installed on the vehicle frame 1, and the part of the second drawing wire 16 located between the first chain 13 and the second runner 11 passes through one side of the fourth runner 18, so The part of the third wire 17 located between the second chain 14 and the third runner 12 passes through the other side of the fourth runner 18, so that the distance between the second wire and the third wire is kept to avoid mutual entanglement Or the gap is too small to rub against the rear wheel.
第二飞轮、第三转轮和第二链条均在图1中所示一侧的对称侧，与第一飞轮、第二转轮和第一链条结构及连接关系相同，所以图1中未示出第二飞轮、第三转轮和第二链条，但并不影响本领域技术人员理解本发明的结构。The second flywheel, the third runner and the second chain are all on the symmetrical side of the side shown in Figure 1, and are the same as the structure and connection relationship of the first flywheel, the second runner and the first chain, so they are not shown in Figure 1 Out of the second flywheel, the third runner and the second chain, but does not affect those skilled in the art to understand the structure of the present invention.
所述第一踏板8和第二踏板9上均安装有脚踏垫19增大脚踏位置的摩擦力。所述第一拉丝15、第二拉丝16和第三拉丝17均为钢丝绳，增大结构强度，防止多次拉动被拉断，延长使用寿命。Foot pads 19 are installed on the first pedal 8 and the second pedal 9 to increase the frictional force of the pedal position. The first drawing wire 15, the second drawing wire 16 and the third drawing wire 17 are all steel wire ropes, which increase the structural strength, prevent multiple pulls from being broken, and prolong the service life.
本具体实施例中，所述车架1上安装有车座20，使用者也可以坐着脚踏。In this specific embodiment, a vehicle seat 20 is installed on the vehicle frame 1, and the user can also sit and pedal.
以上所述的实施例仅是对本发明的优选方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案做出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.
Claims (8)
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| CN201810949766.2A CN108749989A (en) | 2018-08-20 | 2018-08-20 | A kind of rear-mounted bicycle with pedal |
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| CN201810949766.2A CN108749989A (en) | 2018-08-20 | 2018-08-20 | A kind of rear-mounted bicycle with pedal |
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Application publication date: 20181106 |