CN108423115B - Auxiliary driving mechanism of power-assisted bicycle - Google Patents
Auxiliary driving mechanism of power-assisted bicycle Download PDFInfo
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- CN108423115B CN108423115B CN201810147103.9A CN201810147103A CN108423115B CN 108423115 B CN108423115 B CN 108423115B CN 201810147103 A CN201810147103 A CN 201810147103A CN 108423115 B CN108423115 B CN 108423115B
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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
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
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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
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
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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
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
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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
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/80—Accessories, e.g. power sources; Arrangements thereof
- B62M6/90—Batteries
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses an auxiliary driving mechanism of a power-assisted bicycle, which comprises a storage battery, a driving motor, a controller and a chain wheel, wherein the driving motor is powered by the storage battery, the middle shaft is in key connection with an elastic body and is sleeved with an outer gear ring, the outer edge of the elastic body is connected with the inner edge of the chain wheel, the outer edge of the elastic body is connected with the inner edge of the outer gear ring, the driving motor is positioned on a frame close to the middle shaft, an output gear is arranged on an output shaft of the driving motor, the output gear is associated with the outer gear ring through a gear transmission mechanism, a deformation sensor is arranged on the side surface of the elastic body, when the bicycle is ridden by manpower, the elastic body deforms. The invention can simplify the disassembly and assembly and subsequent maintenance of the whole bicycle, and enables the output torque of the electric power assistance to be matched with the torque output by manpower, thereby ensuring that a rider can conveniently control the riding speed of the bicycle according to own subjective intention and avoiding the sudden change of the speed during riding.
Description
Technical Field
The invention relates to the technical field of electric power-assisted bicycles, in particular to an auxiliary driving mechanism of a power-assisted bicycle.
Background
At present, the electric bicycle provided with a storage battery and a hub motor is popularized domestically because of the advantages of labor saving, convenience and the like, however, the existing electric bicycle has the following problems: although the electric bicycle retains the pedals for the rider to ride by manpower, the pedals and the in-wheel motor, which are power sources, can be separately controlled, that is, the rider can directly control the rotation speed of the in-wheel motor through a switch provided on the handle bar of the vehicle, thereby driving the vehicle to travel completely by means of electric power. Thus, when the bicycle is in an electric riding state, because a rider hardly controls the size of a switch, the electric auxiliary drive and the foot treading drive cannot be well matched, only a pure electric drive mode can be adopted, and the foot treading riding can be adopted only when the electric quantity of the storage battery is exhausted. Although the driving mode has the advantages of rapidness and labor saving, overspeed driving is easy to occur, and further unsafe riding is caused. In particular, it cannot meet the requirements of some people for exercising by manpower. That is, the conventional electric bicycle is an electric bicycle with electric power as a main component and manpower as an auxiliary component, and it is difficult to achieve the effect of electric power-assisted driving with manpower as a main component.
Therefore, an electric power-assisted bicycle has been invented, which has a basic structure and operation principle similar to that of an electric bicycle, and drives a vehicle to run by driving a hub motor through a battery, but the rotation of the hub motor is controlled by signals sensed by corresponding sensors, and when a controller receives signals such as the speed and torque of a pedal or the state of the vehicle from the sensors, the controller automatically controls the operation state and output torque of the hub motor. That is to say, the cyclist can't realize pure electric drive under the state of not adopting pedal to ride, and electric drive can only be used for auxiliary drive to have the manpower and ride in order to temper the effect of health when laborsaving.
For example, in chinese patent document, "a method and a system for controlling an electric bicycle", publication No. CN106828758A, the method uses a speed sensor to sense the traveling speed of the electric bicycle, uses a level meter to sense the driving state of the electric bicycle, when the electric bicycle starts to ride, the traveling speed is greater than zero, and if the driving state of the electric bicycle is a horizontal driving state, the electric bicycle is driven by the torque force applied to the pedals by manpower alone, and the rotation speed or the torque force value of the pedals of the vehicle in the horizontal driving state is recorded; if the running state of the electric power-assisted vehicle is the uphill running state, the driving motor is started to rotate in the positive direction to form auxiliary power so as to enable the pedal to reach the rotating speed or the torsion value in the horizontal running state. That is, when the vehicle is running uphill, the torque value outputted by the rider pedaling is consistent with the running speed of the vehicle and the level running; if the driving state of the electric moped is a downhill driving state, the driving motor is driven to rotate reversely by means of inertia of the vehicle to generate electricity so as to charge the mobile power supply.
The electric power-assisted vehicle can automatically control the running mode of the vehicle according to the actual running state, but still has the following defects: firstly, when the vehicle is in a horizontal driving state, the electric power assistance cannot be realized, that is, the torque output by the electric power assistance is not determined according to the torque of the manual riding, and when the vehicle is in the horizontal driving state, the manual riding cannot depend on the electric power auxiliary drive to realize the faster riding, so that the power assistance effect is not ideal. In addition, the driving speed of the vehicle is not the magnitude of the torque output by the motor, which is controlled during electric power assistance, and although the control method is facilitated to be simplified, the problem of excessive output torque during electric power assistance is easily caused, and particularly, when the slope of an ascending slope is large or the load of the vehicle is large, the overload operation of the storage battery and the in-wheel motor is caused, so that the service life of the vehicle is seriously influenced.
In addition, current electric bicycle all adopts the wheel hub motor direct drive rear wheel pivoted that sets up on the rear wheel usually, and it is though can simplify the drive mechanism between motor and the rear wheel to be favorable to avoiding producing the interference between electronic helping hand and the manpower are ridden, nevertheless have following defect: firstly, the hub motor cannot be integrated with the controller, so that the hub motor, the controller and the storage battery are connected through wires arranged on the frame, on one hand, the mounting is difficult, and the problems of disconnection and the like of the connecting wires are easy to occur; on the other hand, when the rear wheel has a tire burst problem and needs to be maintained, the rear wheel is troublesome to mount and dismount. Especially, the rim, wheel and spoke in the current back wheel rim mostly adopt aluminum alloy overall structure, when wheel hub motor or rim appear the problem and need change, need whole back wheel whole change, can't change the part that the part damaged alone.
Disclosure of Invention
The invention aims to solve the problems of troublesome disassembly and assembly and high failure rate of the existing electric moped, and provides an auxiliary driving mechanism of a moped, which can greatly simplify the disassembly and assembly and the subsequent maintenance of the whole vehicle and effectively avoid the failure caused by the open circuit of a connecting lead.
Another object of the present invention is to provide an auxiliary driving mechanism for a bicycle with power assistance, which can accurately detect the output torque of manual riding, so that the output torque of the electric power assistance matches the output torque of manual riding, thereby ensuring that a rider can conveniently control the riding speed of the bicycle according to his own subjective intention, and avoiding the sudden change of speed during riding.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides an auxiliary driving mechanism of helping hand bicycle, is including setting up the battery on the frame of bicycle, by the driving motor of battery power supply, be used for controlling driving motor's controller and set up the chain wheel of axis department at the bicycle, centraxonial both ends be equipped with can with the crank that has the step is connected the link, epaxial key joint has the elastomer and overlaps and be equipped with outer ring gear in, the chain wheel is the ring form, the outward flange of elastomer is connected with the inward flange of chain wheel, and the outward flange of elastomer is connected with the inward flange of outer ring gear, driving motor is located the frame and is close to axis department, be equipped with output gear on driving motor's the output shaft, output gear passes through gear drive and links with outer ring gear the side of elastomer is equipped with the deformation sensor that can sense the elastomer deformation, when the manpower is ridden, the axis is right a moment of torsion, the elastic body is deformed, and the deformation sensor outputs an electric signal corresponding to the deformation amount of the elastic body to the controller.
The invention is applicable to pure power-assisted bicycles, wherein the power of the assistance comes from a driving motor powered by a storage battery, in particular, the driving motor can be started to provide the auxiliary power only when the bicycle is ridden by manpower; when the riding is stopped, the driving motor stops working. The invention is different from the prior electric power-assisted vehicle that a hub motor is used on the rear wheel, a driving motor which is used as a power source is arranged on a vehicle frame, the driving motor drives an outer gear ring connected with a chain wheel to rotate through a gear transmission mechanism, and then the chain wheel can be driven to rotate, and the rear wheel is driven to rotate through a transmission chain arranged on the chain wheel, so as to realize electric power-assisted driving. Thus, when a rear wheel or a driving motor or the like has a problem, independent disassembly, assembly and replacement can be conveniently carried out, and assembly and maintenance in use are greatly facilitated. It can be understood that the storage battery can be arranged close to the driving motor, so that the wire connection between the storage battery and the driving motor and the controller can be simplified. The occurrence of failures due to the disconnection of the connecting wires is reduced.
In addition, the invention arranges a deformation sensor such as a resistance strain gauge on the side surface of the elastic body, so that when the rider begins to ride by manpower, the rider treads on the pedal arranged at the connecting end of the middle shaft to enable the middle shaft to rotate in the positive direction, thereby driving the elastic body connected with the middle shaft in a key way and the chain wheel connected with the elastic body to rotate in the positive direction, and further driving the rear wheel to rotate in the positive direction through the transmission chain. The transmission chain applies backward resistance to the chain wheel, so that the elastic body is subjected to torque to generate torsional deformation, the deformation sensor arranged on the inner side of the elastic body can generate an electric signal, and the controller of the power-assisted bicycle can correspondingly control the output torque of the driving motor according to the electric signal so as to realize electric power auxiliary driving. It will be understood that the torque applied to the elastic body is proportional to the force applied to the pedal by the rider, and accordingly, the electrical signal generated by the deformation sensor is proportional to the deformation of the elastic body, so that the torque applied by the rider while riding is proportional to the electrical signal generated by the deformation sensor. Therefore, when the bicycle runs on an uphill slope or a rider wants to accelerate, the torque acted on the middle shaft and the elastic body by the rider is correspondingly increased, the electric signals output by the deformation sensor are synchronously increased in a proportional manner, and then the controller can control the driving motor to increase the output torque in the same proportion, so that the output torque of the electric power assisting is matched with the torque output by manpower. When stopping manpower to ride, the moment of torsion of being used in the elastomer disappears, and deformation sensor's signal of telecommunication returns to zero, and driving motor stop work promptly this moment to when laborsaving, can ensure again to ride passerby's convenient accurate control speed of riding, avoid appearing the sudden change of speed.
Secondly, the existing bicycle chain wheel is generally an integral structure consisting of an outer ring with teeth on the periphery, a hub with a central key connected to a middle shaft and spokes connected between the hub and the outer ring, and the chain wheel of the invention is a circular structure connected to the outer edge of an elastic body. Thus, the elastomer keyed to the central shaft can act as a spoke in the crankset. When the rider rides the bicycle by manpower, the elastic body can generate corresponding distortion, so that the deformation sensor outputs corresponding electric signals. Because the elastic body and the peripheral chain wheel are of a split structure, the chain wheel and the elastic body can be respectively made of proper materials, so that the strength and the service life of the chain wheel can be ensured, and the elastic body can be ensured to generate proper torsional deformation. Particularly, when the elastic body, the toothed disc and the outer gear ring are connected into a whole by using screws during installation, so that the elastic body, the toothed disc and the outer gear ring are convenient to disassemble and assemble.
Preferably, the elastic body comprises an inner shaft sleeve, an outer shaft sleeve and spokes integrally connected between the inner shaft sleeve and the outer shaft sleeve, wherein the inner shaft sleeve is connected with the middle shaft through a key, the toothed disc is located on the outer side of the elastic body, the outer gear ring is located on the inner side of the elastic body, a plurality of screw holes evenly distributed in the circumferential direction are formed in the outer shaft sleeve, and the outer gear ring and the toothed disc are respectively and fixedly connected to the inner side and the outer side of the outer shaft sleeve through fastening screws arranged in the screw holes.
Because the elastomer includes inner hub, outer hub and spoke, consequently, when the manpower is ridden, the spoke in the elastomer can produce sufficient deformation. And outer ring gear is connected on the outer axle sleeve of elastomer, consequently, the auxiliary drive moment of torsion that driving motor applyed to the chain wheel can not be acted on the spoke of elastomer to ensure that the output moment of torsion that deformation sensor can accurately reflect the manpower and ride.
Preferably, the accommodating groove is formed in the inner side of the spoke of the elastic body, and the deformation sensor is a resistance strain gauge adhered to the accommodating groove so as to conveniently sense the bending deformation of the elastic body of the sensor, and the elastic body is convenient to mount and low in cost.
Preferably, a box body is arranged on the frame close to the middle shaft, and the driving motor, the controller and the gear transmission mechanism are all arranged in the box body, so that a control assembly is formed.
The control assembly formed by the driving motor, the controller and the gear transmission mechanism arranged in the box body forms an integral part, so that the manufacturing, the dismounting and the maintenance are convenient. Particularly, the control assembly is arranged close to the middle shaft, so that the arrangement of connecting wires among the driving motor, the controller and the deformation sensor can be greatly simplified.
Preferably, a slip ring collector is arranged on the inner side of the elastic body, the output end of the deformation sensor is electrically connected with the controller through the slip ring collector, and the input end of the deformation sensor is electrically connected with the storage battery through the slip ring collector.
The electrical connection of the rotary device by means of the slip ring current collector ensures a reliable wire connection and avoids twisting of the connecting wires.
Preferably, the gear transmission mechanism comprises a pinion shaft, a plastic gear and a transition gear, wherein the plastic gear and the transition gear are arranged on the pinion shaft, the plastic gear is meshed with the output gear, the transition gear is meshed with the outer gear ring, and a one-way transmission mechanism is arranged between the plastic gear and the pinion shaft.
When the driving motor works, the output gear drives the pinion shaft to rotate through the plastic gear, and the transition gear drives the outer gear ring to rotate at the moment, so that the toothed disc is driven to rotate. The plastic gear can be made of nylon, so that on one hand, the plastic gear has enough strength, and simultaneously, the transmission noise and the impact are reduced. Particularly, the one-way transmission mechanism is arranged between the plastic gear and the pinion shaft, so that the driving motor can rotate forwards to output auxiliary driving torque to the chain wheel through the gear transmission mechanism, and the chain wheel cannot drag the driving motor to rotate reversely through the gear transmission mechanism during manual riding, thereby reducing the load at the beginning of manual riding.
Preferably, the one-way transmission mechanism comprises an annular groove arranged on the pinion shaft, a rotatable positioning ring is arranged in the annular groove, a plurality of rectangular positioning through holes radially penetrating through the inner side and the outer side of the positioning ring are arranged on the positioning ring, a sleeve ring sleeved on the pinion shaft is arranged at the center of the plastic gear, a clamping straight groove extending along the axial direction is arranged on the inner side wall of the sleeve ring, a clamping pin extending into the clamping straight groove is radially arranged on the circumferential surface of the positioning ring, a clutch groove extending along the circumferential direction is arranged on the inner side wall of the sleeve ring corresponding to the positioning through holes, one end of the clutch groove is a joint end, the other end of the clutch groove is a separation end, the depth of the clutch groove is gradually deepened from the joint end to the separation end, a ball is arranged on one side, corresponding to the joint end, of the positioning through hole, and a pressure spring is arranged on one side, corresponding to, one end of the pressure spring abuts against the side wall of the positioning through hole, the other end of the pressure spring abuts against the ball, so that the ball is positioned at the joint end, one side of the ball abuts against the bottom surface of the clutch groove, and the other side of the ball abuts against the bottom surface of the annular groove.
When the reverse idle running is switched to the forward driving, the existing one-way transmission mechanism usually has an idle running clearance, so that the impact during the forward driving can be caused, on one hand, impact noise can be generated, and on the other hand, the one-way transmission mechanism is easy to damage due to the impact after being used for a long time. The one-way transmission mechanism is provided with a ball and a pressure spring in a positioning through hole of a positioning circular ring, so that the pressure spring can drive the ball to move towards one side corresponding to the joint end of the clutch groove until one side of the ball is attached to the bottom surface of the clutch groove and the other side of the ball is attached to the bottom surface of the annular groove, and the ball is clamped at the joint end of the clutch groove. That is, the depth of the annular groove together with the depth of the clutch groove constitutes the depth of the receiving space in which the ball is received. Since the depth of the clutch groove gradually increases from the engaging end to the disengaging end, that is, the bottom surface of the clutch groove is an inclined surface. When the plastic gear rotates in a forward direction, the depth of the receiving space for receiving the balls becomes gradually shallower, thereby generating a pressing frictional force between the bottom surface of the clutch groove and the balls, which drives the balls to rotate together. Meanwhile, the balls can drive the pinion shaft to rotate in the forward direction by means of the extrusion friction force between the balls and the bottom surface of the annular groove of the pinion shaft, and therefore forward torque transmission is achieved. On the contrary, when the rider begins to ride the manpower, outer ring gear passes through gear drive and drives pinion shaft forward rotation, and the depth that holds the accommodation space of ball this moment is unchangeable, and the bottom surface of annular groove can rely on a frictional force to drive the ball and roll towards the separation end this moment to make the ball loosen with the bottom surface in separation groove and the bottom surface of annular groove in accommodation space, the pinion shaft at this moment can rotate freely relatively the plastic gear, thereby can realize one-way power transmission. The ball is always clamped at the joint end of the clutch groove by the action of the pressure spring, and the ball is respectively kept in a state of being attached to the bottom surface of the clutch groove and the bottom surface of the annular groove, so that the impact generated when the reverse idle rotation is switched to the forward driving can be effectively avoided. Particularly, the invention creatively arranges a positioning ring in the annular groove, and the positioning ring is provided with a clamping pin extending into the clamping straight groove, thereby preventing the positioning ring from rotating relative to the plastic gear, ensuring that the ball can be always clamped at the joint end of the clutch groove, and facilitating the assembly between the plastic gear and the pinion shaft.
Therefore, the invention has the following beneficial effects: the disassembly and assembly and subsequent maintenance of the whole vehicle can be simplified, and meanwhile, the fault caused by the open circuit of the connecting lead is effectively avoided; through the output torque that accurate detection manpower was ridden, make the output torque of electronic helping hand and the big or small phase-match of the moment of torsion of manpower output, ensure that the cyclist can conveniently control the speed of riding of vehicle according to the subjective intention of oneself, the sudden change of speed appears when avoiding riding.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is an axial sectional view of a connection structure of a pinion shaft and a plastic gear.
Fig. 3 is a transverse partial sectional view of a coupling structure of a pinion shaft and a plastic gear.
In the figure: 1. the gear box comprises a driving motor 11, an output gear 2, a controller 3, a middle shaft 31, a connecting end 4, a toothed disc 5, an elastic body 51, an inner shaft sleeve 52, an outer shaft sleeve 53, spokes 531, an accommodating groove 54, a deformation sensor 6, an outer gear ring 7, a box body 8, a pinion shaft 81, a plastic gear 811, a socket ring 812, a clamping straight groove 813, a clutch groove 82, a transition gear 83, an annular groove 9, a positioning circular ring 91, a positioning circular hole/92, a clamping pin 93, a ball 94 and a pressure spring.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 and 2, an auxiliary driving mechanism of an assisted bicycle is suitable for an electric auxiliary driving two-wheel or three-wheel bicycle. The bicycle comprises a storage battery (not shown in the figure) arranged on a frame of the bicycle, a driving motor 1 powered by the storage battery, a controller 2 used for controlling the driving motor, and a chain wheel 4 which is arranged at a middle shaft 3 of the bicycle and is in a circular ring shape, wherein chain teeth capable of being meshed with a transmission chain are arranged on the outer edge of the chain wheel, the middle shaft is rotatably arranged in a five-way in the middle of the frame, the left end and the right end of the middle shaft, which extend out of the five-way, are square connecting ends 31, so that one end of a crank is sleeved on the connecting ends, and the other end of the crank is connected with. Furthermore, an elastomer body 5 and an outer ring gear 6 are arranged on the central shaft, wherein the elastomer body comprises an inner sleeve 51, an outer sleeve 52, a plurality of spokes 53 integrally connected between the inner sleeve and the outer sleeve, the number of spokes is preferably between 4 and 6, the spokes extend in radial direction and are evenly distributed in circumferential direction, wherein the inner sleeve and the central shaft are connected in a key way so as to transmit torque to the elastomer body in the central shaft. The outer gear ring is sleeved on the middle shaft in an empty mode, the chain wheel is located on the outer side of the elastic body, and the outer gear ring is located on the inner side of the elastic body. In addition, a plurality of screw holes which are uniformly distributed in the circumferential direction can be arranged on the outer shaft sleeve, and correspondingly, the outer gear ring and the toothed disc are respectively and fixedly connected to the inner side and the outer side of the outer shaft sleeve through fastening screws arranged in the screw holes. Specifically, a screw hole with internal threads can be arranged on the elastic body, a through hole is arranged at a corresponding position on the chain wheel, and a fastening screw passes through the through hole on the pressure plate and then is in threaded connection with the screw hole of the elastic body, so that the chain wheel is fixed on the outer side of the elastic body. In addition, a screw hole having an internal thread is provided on the outer ring gear, and the screw hole provided at the corresponding position on the elastic body is a through hole having no internal thread, and at this time, a fastening screw provided in the through hole of the elastic body is screwed into the screw hole having an internal thread on the outer ring gear, thereby fixing the outer ring gear to the inner side of the elastic body. Certainly, the outer gear ring can also be provided with a screw hole with internal threads, and the through holes without the internal threads are arranged at the corresponding positions of the elastic body and the toothed disc, and at the moment, the fastening screw can directly penetrate through the through holes on the toothed disc and the elastic body and is in threaded connection with the screw hole of the outer gear ring so as to realize the connection among the toothed disc, the elastic body and the outer gear ring.
Furthermore, an output gear 11 can be arranged on the output shaft of the driving motor, and the output gear is connected with the external gear ring through a gear transmission mechanism, so that the driving motor can drive the pressure plate to rotate through the gear transmission mechanism, and electric auxiliary driving is realized.
In order to simplify wiring of connecting wires, a driving motor can be arranged on a position, close to a five-way joint, of a frame, specifically, a box body 7 is arranged on the position, close to a middle shaft, of the frame, and the driving motor, a controller and a gear transmission mechanism are all arranged in the box body to form a control assembly. Accordingly, the storage battery can be arranged at the upper side of the five-way joint, or at the position below the seat cushion at the rear side of the five-way joint, and of course, the storage battery can also be arranged on the frame connected with the front fork of the five-way joint, so that the driving motor, the storage battery and the controller are as close as possible.
In order to control the operation state of the driving motor, an accommodating groove 531 may be formed in an inner side of one of the spokes of the elastic body, and a deformation sensor 54, such as a resistance strain gauge, which can sense the deformation of the spoke, may be attached to the accommodating groove, so as to conveniently sense the torsional deformation of the spoke. Specifically, a slip ring collector (not shown) may be disposed inside the elastic body, an output end of the deformation sensor is electrically connected to a controller of the assisted bicycle through the slip ring collector, and an input end of the deformation sensor is electrically connected to the battery through the slip ring collector. Therefore, the storage battery can provide power for the deformation sensor, and the output signal generated by the deformation sensor can be transmitted to the controller of the power-assisted bicycle. The deformation sensor rotating along with the chain wheel is electrically connected through the slip ring collector, so that the connection reliability can be ensured, and the connecting wires are prevented from being twisted and wound.
Thus, when the rider begins to ride by manpower, the rider treads on the pedal, so that the crank drives the middle shaft to rotate in the forward direction, and the middle shaft forms a forward acting force on the elastic body; correspondingly, the transmission chain meshed with the crankset forms backward resistance to the crankset so as to form backward acting force on the elastic body, the spokes of the elastic body form torque to enable the spokes to generate torsional deformation, the deformation sensor arranged on the inner side of the spokes can generate an electric signal, and the controller of the power-assisted bicycle can correspondingly control the driving motor to output an output torque matched with the electric signal according to the electric signal so as to realize electric power auxiliary driving. It will be understood that the torque applied to the spokes is proportional to the force applied to the pedals by the rider, and accordingly, the electrical signals generated by the deformation sensors are proportional to the deformation of the spokes, so that the torque output by the rider while riding is proportional to the electrical signals generated by the deformation sensors. Like this, when meetting the slope, or ride passerby and want to ride with higher speed when riding, the passerby can increase correspondingly to the effort of step, and the signal of telecommunication that deformation sensor output also increases in direct proportion in step this moment, and then the moment of torsion of output is increased with the same proportion to the steerable driving motor of controller, makes the output torque of electronic helping hand and the big or small phase-match of the moment of torsion of manpower output, has both reached laborsaving mesh, can ensure again to ride passerby's convenient accurate control speed of riding, avoids appearing the sudden change of speed.
The gear transmission mechanism of the present invention includes a pinion shaft 8 arranged in parallel with the output shaft of the drive motor, a plastic gear 81 provided on the pinion shaft, and a transition gear 82, the plastic gear being engaged with the output gear, the transition gear being engaged with the outer ring gear. When the driving motor works, the output gear drives the pinion shaft to rotate through the plastic gear, and the transition gear drives the outer gear ring to rotate at the moment, so that the toothed disc is driven to rotate. The plastic gear can be made of nylon, so that on one hand, the plastic gear has enough strength, and simultaneously, the transmission noise and the impact are reduced.
In addition, a one-way transmission mechanism can be arranged between the plastic gear and the pinion shaft, so that the driving motor can drive the pressure plate to rotate through the gear transmission mechanism to form electric auxiliary driving. When the bicycle is ridden by manpower, the chain wheel can not drag the driving motor to rotate reversely through the gear transmission mechanism, so that the load of the bicycle just started to be ridden by manpower can be reduced.
Specifically, as shown in fig. 2 and 3, the one-way transmission mechanism of the present invention includes an annular groove 83 provided on the pinion shaft, a rotatable positioning ring 9 provided in the annular groove, the positioning ring having a rectangular cross section, and 4 to 6 rectangular positioning through holes 91 radially penetrating through the inner and outer sides of the positioning ring. The center of the plastic gear is provided with a sleeve ring 811 which is made of stainless steel and is sleeved on the pinion shaft, the inner side wall of the sleeve ring is provided with a clamping straight groove 812 which extends along the axial direction, and one end of the clamping straight groove penetrates through the end face of the sleeve ring. The circumferential surface of the positioning ring is radially provided with a clamping pin 92 extending into the clamping straight groove, so that the positioning ring can be prevented from rotating relative to the plastic gear. In addition, the inner side wall of the socket ring is provided with a clutch groove 813 extending along the circumferential direction corresponding to the positioning through hole of the positioning circular ring, one end of the clutch groove is a joint end, the other end of the clutch groove is a separation end, and the depth of the clutch groove is gradually deepened from the joint end to the separation end. In addition, a ball 93 is arranged in the positioning through hole corresponding to one side of the joint end, a pressure spring 94 is arranged in the positioning through hole corresponding to one side of the separation end, one end of the pressure spring abuts against the side wall of the positioning through hole, the other end of the pressure spring abuts against the ball, so that the ball is positioned at the joint end, one side of the ball abuts against the bottom surface of the clutch groove, and the other side of the ball abuts against the bottom surface of the annular groove.
It should be noted that the annular groove and the clutch groove together form a receiving space for receiving the balls, and a radial distance between a bottom surface of the annular groove and a bottom surface of the clutch groove forms a radial dimension of the receiving space for receiving the balls, the radial dimension of the receiving space is smallest at the engaging end and largest at the disengaging end, and the dimension of the receiving space is smaller than the diameter of the balls at the engaging end and larger than the diameter of the balls at the disengaging end.
When the plastic gear rotates forwards, the depth of the accommodating space for accommodating the ball is gradually reduced, and the inclined bottom surface of the clutch groove can form an extrusion friction force on the ball, so that the ball rotates synchronously. Meanwhile, extrusion friction force is formed between the balls and the bottom surface of the annular groove of the pinion shaft, and then the pinion shaft is driven to rotate positively, so that positive torque transmission is achieved. On the contrary, when the rider begins to ride by manpower, the gear ring drives the pinion shaft to rotate in the forward direction through the gear transmission mechanism, and the bottom surface of the annular groove can drive the ball to roll towards the separation end by means of friction force, so that the ball is loosened from the bottom surface of the separation groove and the bottom surface of the annular groove in the accommodating space, the pinion shaft can rotate freely relative to the plastic gear, and unidirectional power transmission can be achieved. The ball is always clamped at the joint end of the clutch groove by the action of the pressure spring, and the ball is respectively kept in a state of being attached to the bottom surface of the clutch groove and the bottom surface of the annular groove, so that the impact generated when the reverse idle rotation is switched to the forward driving can be effectively avoided. Of course, a friction ball may be disposed between the compression spring and the ball, so that the ball is in point contact with the friction ball, thereby facilitating the rotation of the ball.
Claims (7)
1. An auxiliary driving mechanism of a power-assisted bicycle comprises a storage battery arranged on a frame of the bicycle, a driving motor powered by the storage battery, a controller used for controlling the driving motor, and a chain wheel arranged at the middle shaft of the bicycle, wherein the two ends of the middle shaft are provided with connecting ends which can be connected with a crank with pedals, the auxiliary driving mechanism is characterized in that the middle shaft is in key connection with an elastic body and is sleeved with an outer gear ring, the chain wheel is in a circular ring shape, the outer edge of the elastic body is connected with the inner edge of the chain wheel, the outer edge of the elastic body is connected with the inner edge of the outer gear ring, the driving motor is arranged on the frame and is close to the middle shaft, an output gear is arranged on an output shaft of the driving motor, the output gear is associated with the outer gear ring through a gear transmission mechanism, the elastic body comprises an, the inner shaft sleeve is connected with the middle shaft through a key, a deformation sensor capable of sensing deformation of the elastic body is arranged on the inner side face of each spoke, when the bicycle is ridden by manpower, the middle shaft applies a torque to the elastic body, the elastic body deforms, and the deformation sensor outputs an electric signal corresponding to the deformation of the elastic body to the controller.
2. The auxiliary driving mechanism of an assisted bicycle as claimed in claim 1, wherein the crankset is located outside the elastic body, the outer ring gear is located inside the elastic body, a plurality of screw holes are uniformly distributed in a circumferential direction on the outer sleeve, and the outer ring gear and the crankset are fixedly connected to the inner side and the outer side of the outer sleeve respectively through fastening screws arranged in the screw holes.
3. The auxiliary driving mechanism for a power assisted bicycle as claimed in claim 2, wherein the spokes of the elastic body are provided with accommodating grooves, and the deformation sensor is a resistance strain gauge adhered in the accommodating grooves.
4. The auxiliary driving mechanism of an assisted bicycle as claimed in claim 1, wherein a case is provided on the frame near the center shaft, and the driving motor, the controller and the gear transmission mechanism are all disposed in the case, thereby forming a control assembly.
5. The auxiliary driving mechanism of an assisted bicycle as claimed in claim 1, wherein a slip ring collector is disposed inside the elastic body, the output terminal of the deformation sensor is electrically connected to the controller through the slip ring collector, and the input terminal of the deformation sensor is electrically connected to the battery through the slip ring collector.
6. The auxiliary driving mechanism for a power assisted bicycle as claimed in claim 1, wherein the gear transmission mechanism comprises a pinion shaft, a plastic gear disposed on the pinion shaft, and a transition gear, the plastic gear is engaged with the output gear, the transition gear is engaged with the external gear ring, and a one-way transmission mechanism is disposed between the plastic gear and the pinion shaft.
7. The auxiliary driving mechanism for a power-assisted bicycle as defined in claim 6, wherein the one-way transmission mechanism comprises an annular groove formed in the pinion shaft, a rotatable positioning ring is disposed in the annular groove, the positioning ring is provided with a plurality of rectangular positioning through holes radially penetrating through the inner and outer sides of the positioning ring, the plastic gear is provided at its center with a coupling ring fitted over the pinion shaft, the inner sidewall of the coupling ring is provided with a straight retaining groove extending in the axial direction, the circumferential surface of the positioning ring is radially provided with a retaining pin extending into the straight retaining groove, the inner sidewall of the coupling ring is provided at a position corresponding to the positioning through hole with a clutch groove extending in the circumferential direction, one end of the clutch groove is an engaging end, the other end of the clutch groove is a disengaging end, the depth of the clutch groove gradually increases from the engaging end to the disengaging end, and a ball is disposed in the positioning through hole at a side corresponding to the engaging end, and a pressure spring is arranged in the positioning through hole and corresponds to one side of the separation end, one end of the pressure spring is abutted against the side wall of the positioning through hole, the other end of the pressure spring is abutted against the ball, so that the ball is positioned at the joint end, one side of the ball is abutted against the bottom surface of the separation groove, and the other side of the ball is abutted against the bottom surface of the annular groove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810147103.9A CN108423115B (en) | 2018-02-12 | 2018-02-12 | Auxiliary driving mechanism of power-assisted bicycle |
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| CN201810147103.9A CN108423115B (en) | 2018-02-12 | 2018-02-12 | Auxiliary driving mechanism of power-assisted bicycle |
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| CN108423115B true CN108423115B (en) | 2020-05-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019171860A1 (en) * | 2018-03-05 | 2019-09-12 | 本田技研工業株式会社 | Electric assist device for bicycles and bicycle |
| CN109263783B (en) * | 2018-09-05 | 2020-10-16 | 江苏铱拜科技有限公司 | Electric power-assisted bicycle middle shaft torque sensor and pedaling frequency sensor system |
| CN109591945A (en) * | 2019-01-15 | 2019-04-09 | 浙江鑫驱科技有限公司 | A kind of power-aid bicycle torque testing agency facilitating installation |
| CN111319711A (en) * | 2019-12-27 | 2020-06-23 | 苏州万佳电器有限公司 | Centrally-mounted driving mechanism and power-assisted bicycle |
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