The wireless torque sensing system for central axis of bicycle middle shaft
Technical field
The utility model relates to morpet actuation techniques field, especially relates to a kind of wireless torque sensing system for central axis of the bicycle middle shaft that can realize zero start.
Background technology
Morpet, claim again booster type electric bicycle, a kind of instrument of riding between bicycle and battery-driven car, by electric power assist manpower offer bicycle advance in needed kinetic energy, that it is that people pursue is efficient, convenient, healthy, the product of the life style of environmental protection.Mid-system is the core component of morpet, integrates moment detection, controller, motor and drives, and controls normally travelling of car load.
At present, morpet is market abroad, as popular in the more developed country such as German, Japanese.In China, Electrical Bicycle still occupies principal market, and the driving of most Electrical Bicycle employing hub-type, compared with the mid-system that adopts moment to detect, has obvious inferior position.Hub-type drives motor is placed in to car body front-wheel or trailing wheel, cause car load center of gravity forward or lean on after, do not meet people's the mode of riding.And road speed relies on handle control completely, in the heavy duty situations such as contrary wind, climbing, power-handling capability is received considerable restraint and impact.The physical construction of this hub-type also makes the difficulty of installing and overhauling increase simultaneously, has virtually also increased the potential safety hazard in use procedure.In addition different from traditional cycling mode and road speed is too fast, therefore also there is certain danger at traffic safety, probably can cause increasing of new traffic problems.
The use of the mid-system of moment, will overcome the defect of conventional electric bicycle, has the outstanding effect of riding, and will become a kind of trend of battery-driven car development.
At present, the existing mid-system for morpet on market, the scheme not detecting based on moment, but the velocity magnitude that detects people's pin and trample stretcher by tachogenerator, thereby by the certain propulsive effort of the pro rata output of controller control motor.In brief, it is lower that manpower is trampled speed, and the propulsive effort of motor output is less; It is higher that manpower is trampled speed, and the propulsive effort of motor output is just larger, and then realize the object of power-assisted.
It is based on manpower is converted to angular transposition that its moment of the mid-system schema of other company detects, two magnet ring sequences, and by Hall, the angle relatively moving is detected, step on foot-operated moment thereby detect people.
The above-mentioned mid-system detecting based on speed has certain power-assisted effect under common road conditions.But while running into the road conditions of the high-drags such as contrary wind or upward slope, heavy load, the speed of a motor vehicle itself of riding due to people is lower, so the propulsive effort of motor output is also less, cannot reach the object of power-assisted at all, the effect of riding is poor, can not be accepted by mainstream market.And detect based on the moment of magnet ring, Hall scheme, its complicated in mechanical structure, needs spring, a pair of magnet ring to cooperatively interact, and setting accuracy is required very high, and the later stage easily occurs because vehicle falls shortcomings such as falling the measured error that causes.
In addition, in the wireless torque sensing system for central axis of existing bicycle middle shaft, also there is following problem: 1, torque sensor is set directly on axis, a kind of torque sensing system for central axis and quadratic expression method for transmitting signals thereof of bicycle middle shaft for example, in the patent publication us that is 201010548510.4 at application number, are recorded, torque sensing system for central axis in this application comprises the torque sensor of being located at bicycle middle shaft, one wireless signal transmitter being electrically connected with torque sensor and be located at the wireless signal receiver that closes on middle shaft position of bicycle body, this system is in the time that people firmly tramples left side stretcher, the transmittance process of moment is: left side stretcher-axis-torque sensor-chain wheel, be that torque sensor can detect moment before chain wheel rotates, drive motor in time, auxiliary manpower is ridden, but when manpower is while sending from the right stretcher, the transmittance process of moment is right side stretcher-axis-chain wheel, when chain wheel has rotated like this, torque sensor can't detect moment, thereby cannot drive motor, the method of existing solution just goes out left and right moment size by software simulation after startup, so existing this moment transfer mode cannot be realized zero start, the effect of riding is poor, and most people get used to right crus of diaphragm and start bicycle, like this, based on above-mentioned analysis, this kind of method has no advantage especially, 2, motor straight was connected after reduction gear is drawn and be connected with chain wheel, in the time that the speed of people's pushes pedals is greater than the speed of motor, manpower can be rotated by drive motor, has increased the weight of the burden of human body like this.Especially, in the time closing mid-system power supply, people can bear the load of motor rotation in the process of riding, thus compare ordinary bicycle ride more painstaking; 3, existing mid-system is on signal processing mode, general is carried out the torque signals detecting etc. after simple signal processing, all send to controller, by controller, signal is unified to process and control, so improved to a certain extent the dependence of mid-system to controller, the function of controller is also proposed to certain requirement simultaneously, dwindled the type selecting scope of controller, thereby the commonality of mid-system is weakened; 4, existing mid-system adopts Hall element solely to detect the tach signal of chain wheel, the i.e. design of this sensor only has a road signal output, can not realize the dual control to chain wheel rotating speed and hand of rotation, thereby, even likely there is the generation of the dangerous phenomenon such as maloperation, driving in the control of helper motor well.
Utility model content
The purpose of this utility model is to overcome the defect of prior art, a kind of wireless torque sensing system for central axis of bicycle middle shaft is provided, can realize zero start, the effect of riding is better, be applicable to all road conditions simultaneously, can obtain preferably power-assisted effect at low speed, while riding at a high speed, there is installation, easy to maintenance, steady operation and other merits, can allow user reach object real, that easily ride.
For achieving the above object, the utility model proposes following technical scheme: a kind of wireless torque sensing system for central axis of bicycle middle shaft, comprise axis, torque sensor, wireless launcher, speed and direction detection device, radio receiver, controller, wherein,
Described torque sensor is fixed on described axis, uploads the torque signals of passing for responding to from axis;
Described wireless launcher and described torque sensor are electrically connected, the torque signals of sending for receiving described torque sensor, and with wireless mode, described torque signals is sent to described radio receiver;
Described speed and direction detection device are for detect tach signal and hand of rotation signal simultaneously;
Between described radio receiver and described wireless launcher, radio communication is connected, and after described torque signals is received and processed, sends to described controller.
Preferably, this system also comprises chain wheel, and described chain wheel is connected with described axis by first clutch, and for the chain of bicycle is installed, described speed and direction detection device detect tach signal and the hand of rotation signal of chain wheel simultaneously.
Described speed and direction detection device are Hall element, and described Hall element comprises chip and the peripheral circuit thereof of two-way Hall, and described Hall element one tunnel output digital pulse signal, for detection of chain wheel rotating speed; Another road outbound course signal, for judging the hand of rotation of chain wheel.
This system also comprises plastics inner ring and plastic outer ring, and described plastics inner ring is set on described axis, and along with described axis rotates together; Described plastic outer ring is set on described plastics inner ring, and and described plastics inner ring between there is gap, described plastic outer ring is fixed, on the relevant position of described plastics inner ring and plastic outer ring one side surface, offers the first circular groove and the second circular groove.
This system also comprises wireless power supply, and described wireless power supply comprises interior loop and exterior loop, and described interior loop is wrapped in the second circular groove of described plastics inner ring, and described exterior loop is wrapped in the second circular groove of described plastic outer ring.
In the first circular groove of described plastics inner ring, magnet ring is installed, described speed and direction detection device pass through to detect the field signal on magnet ring, thereby obtain rotating speed and the hand of rotation of chain wheel.
This system also comprises the first housing being installed in bicycle five-pipe, described axis is through described the first housing, and described plastics inner ring, plastic outer ring, first clutch, torque sensor, speed and direction detection device, wireless launcher are all arranged in described the first housing.
This system also comprises the second housing being fixedly connected with described the first housing, in described the second housing, comprise motor, transmission device and accommodation space, described transmission device comprises second clutch and transmission shaft, described transmission device is connected with described motor by described second clutch, and described radio receiver and described controller are arranged in described accommodation space.
Described wireless launcher comprises rectification stable pressuring unit, first signal processing unit, radiofrequency emitting module, and described rectification stable pressuring unit, first signal processing unit are sent by described radiofrequency emitting module after the torque signals receiving is processed.
Described radio receiver comprises power module, secondary signal processing unit, Receiver Module, and described Receiver Module receives after torque signals, after described secondary signal processing unit processes, sends to described controller.
Described speed and direction detection device are arranged in the first circular groove of described plastic outer ring.
The beneficial effects of the utility model are: (1) this system integrates the equipment such as wireless power, transmission over radio, moment detection, chain wheel speed and defence line detection, motor, controller, integrated level is high, need not other accessories can be directly installed on ordinary bicycle and use, be convenient to processing, installation and maintenance; (2) in system, set up torsion cylinder, optimized the transfer mode of moment, left and right is foot-operated can detect moment before chain wheel rotates, and has realized zero start function, without software simulation, makes that balance of bicycle is good, non-jitter; (3) this system goes out speed and the direction detection device of two paths of signals output, can measure the rotating speed of chain wheel, can measure again the hand of rotation of chain wheel, effectively prevents maloperation, prevents the generation of the phenomenons such as driving; (4) system arranges power-transfer clutch on transmission device, by power-transfer clutch, motor is connected with chain wheel, has ensured that motor can not be driven to rotate when motor speed is during lower than the rotating speed of chain wheel, and manpower can drive motor running, has alleviated body burden; (5) system adds signal processing unit on radio receiver, completes the processing of main signal data, and controller, without extra data operation, has reduced the requirement to controller, without the specific controller of coupling, has strengthened the commonality of system; (6) this system moment detection range is large, and strong adaptability is applicable to all groups and all road conditions, makes bicyclist reach object real, that easily ride.
Brief description of the drawings
Fig. 1 is the integral structure schematic diagram of the wireless torque sensing system for central axis of the utility model bicycle middle shaft;
Fig. 2 is the sectional structure schematic diagram of the first housing in Fig. 1;
Fig. 3 is the sectional structure schematic diagram of the second housing in Fig. 1;
Fig. 4 is the blast structural representation of the first housing and the second enclosure interior subassembly;
Fig. 5 is the schematic flow sheet of moment transmittance process of the present utility model;
The wireless torque sensing system for central axis circuit connection diagram of Fig. 6 the utility model bicycle middle shaft;
Reference numeral: 1, the first housing, 11, torsion cylinder, 12, torque sensor, 13, plastics inner ring, 131, the first circular groove of plastics inner ring, 132, the second circular groove of plastics inner ring, 14, plastic outer ring, 141, the first circular groove of plastic outer ring, 142, the second circular groove of plastic outer ring, 15, wireless transmission plate, 16, wireless power supply, 161, interior loop, 162, exterior loop, 17, velocity reversal detecting device, 18, first clutch, 2, seal ring, 3, axis, 31, first section of stretching out, 32, interlude, 33, second section of stretching out, 4, chain wheel, 5, the second housing, 51, motor, 511, motor shaft, 52, connecting gear, 521, second clutch, 522, transmission shaft, 53, accommodation space, 54, wireless receiving plate, 55, controller, 6, clutch shaft bearing, 7, the second bearing, 8, spline, 9, panel beating fixed cover, 10, partial metallurgy, 19, magnet ring, 20, gear, 21, the 3rd bearing, 22, the second spline.
Detailed description of the invention
Below in conjunction with accompanying drawing of the present utility model, the technical scheme of the utility model embodiment is carried out to clear, complete description.
Orientation in the utility model is described and is specifically described according to the orientation in Fig. 1~6, and the direction up and down in Fig. 1~6 is the direction up and down of describing in the utility model.
The wireless torque sensing system for central axis of a kind of bicycle middle shaft that the utility model discloses, is mainly used on morpet, by electric power assist the type of drive of manpower offer bicycle advance in needed kinetic energy.Can realize zero start, the effect of riding is outstanding; Be applicable to all road conditions simultaneously, while riding, can obtain preferably power-assisted effect in low speed, high speed, there is installation, easy to maintenance, steady operation and other merits, can allow user reach the real object of easily riding.
As shown in Figure 1, this mid-system comprises the first housing 1, seal ring 2, axis 3, chain wheel 4 and the second housing 5, and described the first housing 1 is arranged in the Five-way tube (not shown) of bicycle; Described seal ring 2 is wrapped on described the first housing 1, for passing after described Five-way tube at described the first housing 1, it is carried out to fastening, sealing, plays effect fixing, waterproof and dustproof.
Described axis 3 is through described the first housing 1, be used for ensureing when it rotates that axle center unanimously, do not depart from, described axis 3 comprises the first section of stretching out 31 and second section of stretching out 33 of interlude 32, interlude 32 both sides, described interlude 32 is positioned at described the first housing 1, and described interlude 32 is connected with described seal ring 2 by clutch shaft bearing 6 near one end of described the first section of stretching out 31, the other end is fixedly connected with described chain wheel 4 by the second bearing 7, and the two ends of described axis 3 are used for connecting bicycle pedals.
Described chain wheel 4 is fixedly connected in described the second section of stretching out 33, for the chain of bicycle is installed.
Described the second housing 5 is fixedly connected with described the first housing 1, is suspended on bicycle five-pipe below when installation, and described in Fig. 1, the second housing 5 is suspended on the below of described the first housing 1.
As shown in Figure 2, in described the first housing, 1 comprises torsion cylinder 11, torque sensor 12, plastics inner ring 13, plastic outer ring 14, wireless transmission plate 15, wireless power supply 16, velocity reversal detecting device 17 and first clutch 18, described torsion cylinder 11 is set on described axis 3, and and described axis 3 between there is certain gap, described torsion cylinder 11 comprises left end and right-hand member, the left end of described torsion cylinder is closely connected with described axis 3 by the first spline 8, and the right-hand member of described torsion cylinder 11 is fixedly linked with described first clutch 18 by the second spline 22.
Described torque sensor 12 sticks on described torsion cylinder 11, for responding to the torque signals on described torsion cylinder 11.Described torque sensor 12 can adopt a kind of strain bridge-type torque sensor being made up of multiple strain-gaugies.
Described plastics inner ring 13 is closely set on described torsion cylinder 11, and can rotate together along with described torsion cylinder 11, the left-hand face of described plastics inner ring 13 offers two circular grooves, is respectively the first circular groove 131 of plastics inner ring and the second circular groove 132 of plastics inner ring.
Described plastic outer ring 14 is set on described plastics inner ring 13, and fixing by panel beating fixed cover 9, described panel beating fixed cover 9 is set on plastic outer ring 14, and by a stop pin (not shown), plastic outer ring 14 is fixed on the first housing 1, its left end is smoothly connected by partial metallurgy 10 and torsion cylinder 11.Described panel beating fixed cover 9 has ensured to have certain gap between described plastic outer ring 14 and described plastics inner ring 13, plays the object that both isolate mutually.On described plastic outer ring 14, the position corresponding with the circular groove of described plastics inner ring 13 is same also offers two circular grooves, is respectively the first circular groove 141 of plastic outer ring and the second circular groove 142 of plastic outer ring.
Described wireless transmission plate 15 is fixed on the surface of described plastics inner ring 13, and between described torque sensor 12, is electrically connected the torque signals of sending for receiving described torque sensor 12, and torque signals described in wireless transmission.Particularly, described wireless transmission plate 15 comprises rectification stable pressuring unit, first signal processing unit, radio frequency (RF) transmitter module, as shown in Figure 6, described rectification stable pressuring unit, first signal processing unit and described torque sensor 12 are electrically connected, and described rectification stable pressuring unit, first signal processing unit are sent by described RF transmitter module after the torque signals receiving is processed.
Described wireless power supply 16 comprises interior loop 161 and exterior loop 162, be used for to the axis 3 in the first housing 1, torsion cylinder 11, first clutch 18 rotatable parts such as grade provide operation required power supply, wherein said interior loop 161 is wrapped in the second circular groove 132 of described plastics inner ring, described exterior loop 162 is wrapped in the second circular groove 142 of described plastic outer ring, because plastics inner ring 13 can be with torsion cylinder 11 rotations, and described plastic outer ring 14 is fixed, so according to electromagnetic induction principle, between interior loop 161 and exterior loop 162, form electromagnetic field, described interior loop 162 is in this electromagnetic field in rotary course, the power supply that generation system is required.The utility model adopts the advantage of wireless power mode to be: the phenomenons such as wearing and tearing can effectively avoid adopting the wire transmission such as slip ring time, heating, bad contact, the form of this twin coil simultaneously, scheme is simple, voltage swing and the speed of a motor vehicle are irrelevant, and stable power supply requirement can be provided in any case.
Described speed and direction detection device 17 are arranged in the first circular groove 141 of described plastic outer ring, for detection of chain wheel rotating speed and the hand of rotation that judges chain wheel, described speed and direction detection device 17 can adopt Hall element, and described Hall element comprises chip and the peripheral circuit thereof of two-way Hall.Particularly, described speed and direction detection device 17 have two paths of signals output, and a road is digital pulse signal, for detection of chain wheel rotating speed; One tunnel is direction signal, for judging the hand of rotation of chain wheel, in the time that chain wheel rotates, described speed and direction detection device 17 are by the two paths of signals collecting, its internal circuit can detect the hand of rotation of chain wheel by judging the phase difference of two paths of signals, and described speed and direction detection device 17 are by digital pulse signal and direction signal output simultaneously.In the time of chain wheel forward, can obtain correct chain wheel rotating speed like this, the auxiliary control to motor; In the time that chain wheel 4 reverses, disable motor in time, can effectively prevent due to the unclear maloperation causing of direction identification, prevent the generation of driving phenomenon, protected bicyclist's the security of the lives and property, reduced safety traffic hidden danger.
In the first circular groove 131 of described plastics inner ring, magnet ring 19 is installed, described speed and direction detection device 17 are by detecting the field signal on described magnet ring 19, thus the hand of rotation of acquisition chain wheel rotating speed and chain wheel.
Described first clutch 18 is set on described axis 3 and with torsion cylinder 11 and is fixedly connected with, and for fixing chain wheel 4, described chain wheel 4 is fixed on described first clutch 18, and described first clutch 18 can be selected overriding clutch.On described first clutch 18, offer gear 20, described gear 20 one end are fixed on described the first housing 1 by the 3rd bearing 21.
Shown in Fig. 3, Fig. 4, in described the second housing 5, comprise motor 51, connecting gear 52, accommodation space 53, wireless receiving plate 54 and controller 55, wherein said motor 51 has motor shaft 511, and is connected with described connecting gear 52; Described connecting gear 52 comprises second clutch 521 and transmission shaft 522, and its one end is connected with described motor shaft 511, and the other end is connected with the gear 20 on described first clutch 18, for transmitting the torque of motor 51.The connecting gear 52 that the utility model adopts is different from and existingly directly motor 51 is connected with reduction gear, but has increased second clutch 521 on transmission shaft 522.Its meaning is: in the time that the speed of people's pushes pedals is greater than the speed of motor 51, motor 51 can separate with transmission shaft 522, and therefore, manpower can not rotate by drive motor 51, has alleviated human body burden.Especially, in the time of shutdown system power supply, the people Shi Buhui that rides bears the load that motor 51 rotates as common electric car, thus can be as ordinary bicycle light riding.Described second clutch 521 can use overriding clutch equally.
Described wireless receiving plate 54 and described controller 55 are arranged in described accommodation space 53, on wherein said wireless receiving plate 54, comprise power module, secondary signal processing unit, RF receiver module, as shown in Figure 6, after the torque signals that described RF receiver module receives, by described secondary signal processing unit, signal is further processed, and signal after treatment is sent to described controller 55, control described motor 51 by controller 55 bicycle is carried out to power-assisted work.
Described RF transmitter module and described RF receiver module form a signal wireless transmission device, for transmitting the torque signals detecting.
The utility model has added secondary signal processing unit in wireless receiving plate 54, the use of described secondary signal processing unit, greatly reduce the burden of controller 55, be in particular in, the analysis of described secondary signal processing unit is also processed chain wheel rotating speed and the chain wheel hand of rotation signal exported by velocity reversal detecting device 17, also be responsible for processing torque signals simultaneously, on this basis, controller 55 also can send to secondary signal processing unit by the tach signal of motor 51, secondary signal processing unit is to received data analysis, calculate, finally only export a moment analog signal to controller, 55 of controllers need be processed this analog signal, just can reasonably control motor 51.Above process is lower to the dependence of controller 55, thus needn't adaptive specific controller 55, make the type selecting scope of controller 55 larger, system commonality is stronger.
Torque sensor 12 is directly arranged on axis 3 different from traditional, the utility model is set up torsion cylinder 11 on axis 3, therefore makes the transmittance process of moment also not identical.Particularly, as shown in Figure 5,
In the time that left side is foot-operated stressed, the transmittance process of moment is: ride-axis 3-torsion cylinder 11-torque sensor 12-first clutch 18-chain wheel 4 of left side;
In the time that right side is foot-operated stressed, the transmittance process of moment is: ride-axis 3-torsion cylinder 11-torque sensor 12-first clutch 18-chain wheel 4 of right side.
Said process shows, no matter left foot firmly or right crus of diaphragm firmly, the transmittance process of its moment is the same, torque sensor 12 all can detect torque signals prior to chain wheel 4, thereby controller 55 is drive motor 51 in time, auxiliary car body starts and travels, and has realized zero start process, makes to start lighter, laborsaving.Meanwhile, in the process of riding, the left and right sense of equilibrium is better, occurs without the phenomenon of stepping on sky, shake.
Technology contents of the present utility model and technical characterictic have disclosed as above; but those of ordinary skill in the art still may be based on teaching of the present utility model and announcements and are done all replacement and modifications that does not deviate from the utility model spirit; therefore; the utility model protection domain should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present utility model and modifications, and contained by present patent application claim.