CN102528123B - Speed changing tool - Google Patents

Speed changing tool Download PDF

Info

Publication number
CN102528123B
CN102528123B CN201010615654.7A CN201010615654A CN102528123B CN 102528123 B CN102528123 B CN 102528123B CN 201010615654 A CN201010615654 A CN 201010615654A CN 102528123 B CN102528123 B CN 102528123B
Authority
CN
China
Prior art keywords
gear
motor
speed
speed change
change tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201010615654.7A
Other languages
Chinese (zh)
Other versions
CN102528123A (en
Inventor
钟红风
张士松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Positec Power Tools Suzhou Co Ltd
Original Assignee
Positec Power Tools Suzhou Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Positec Power Tools Suzhou Co Ltd filed Critical Positec Power Tools Suzhou Co Ltd
Priority to CN201010615654.7A priority Critical patent/CN102528123B/en
Publication of CN102528123A publication Critical patent/CN102528123A/en
Application granted granted Critical
Publication of CN102528123B publication Critical patent/CN102528123B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Structure Of Transmissions (AREA)

Abstract

The invention discloses a speed changing tool, which comprises a shell, a motor, an output shaft, a gear transmission mechanism and a control system, wherein the motor is arranged in the shell and outputs rotating power; the gear transmission mechanism is arranged between the motor and the output shaft to transmit rotating output of the motor to the output shaft and comprises a gear train and a movable piece; the movable piece can move between a first position and a second position to output the rotating speed of the motor in different speed reducing ratios through the gear transmission mechanism; the gear train comprises at least one gear ring; the control system comprises a driving device matched with the movable piece; the driving device is used for cutting off current of the motor when the speed reducing ratios of the gear transmission mechanism are needed to be changed and driving the movable piece to be switched between the first position and the second position; the gear ring is connected to the shell in a rotatable mode through at least one energy storage unit, has a balance position and at least one energy storage position, and is limited to continuously rotate after rotating to the energy storage position; and the energy storage unit always applies force to the gear ring at the balance position.

Description

Speed change tool
Technical field
The present invention relates to a kind of speed change tool, especially a kind of by the motor-driven instrument with the exportable different rotating speeds of variable transmission mechanism, as electric drill, screwdriver and hammer drill etc.
Background technology
A speed change tool, as electric drill, screwdriver and hammer drill etc., with the exportable different rotating speed of variable transmission mechanism to adapt to different load torques.The variable transmission mechanism of speed change tool all comprises gear drive and the control system of connecting motor and output shaft conventionally, thereby this control system changes gearratio by changing with the meshing relation of gear drive, makes output shaft export different speed.In the prior art, as the automatic transmission of No. 6824491 announcement of U.S. Patent Bulletin, its control system can change and automatically adjust the output that realizes friction speed with the meshing relation of gear drive according to load torque, this control system is utilized the throw-out collar rotation of strap cam face to promote slip ring and is moved axially, and then the ring gear in driven wheel transmission mechanism moves axially and the rotation stop device clamping being arranged on shell.European patent application discloses EP0787931A1 and also discloses a kind of automatic transmission.The variation that above-mentioned these automatic transmissions all change corresponding outputting torsion with the position relationship between frame for movement realizes fluid drive, this mechanical type gear not only makes the mechanical realization of gear drive inside more complicated, and because ring gear also rotated in the axially movable while, and shell is relatively-stationary, so when this gear is in speed change time, the collision and be difficult to engagement mutually of the tooth of the ring gear in rotation and the tooth of the rotation stop device on shell, therefore cannot really realize fluid drive and carry out the object of industrialized implementation.China bulletin patent CN201093036Y discloses the speed change tool that a kind of electric drives, its control system can sensing physical parameter and after parameter reaches predetermined value accessory drive carry out fluid drive.
Summary of the invention
Technical problem to be solved by this invention is: a kind of speed change tool is provided, and this instrument carrys out simplified structure by the means of dynamo-electric combination, and realization can be made reliably the object automatically switching between different output gears.
Technical scheme of the present invention is: a kind of speed change tool, comprising: casing; Motor, is arranged in casing, and outputting rotary power; Output shaft; Gear drive, be arranged between motor and output shaft so that the rotation output of motor is delivered on output shaft, it comprises gear train and moving member, described moving member can move between primary importance and the second place, and when primary importance and the second place, described moving member coordinates in a different manner with described gear train, thereby gear drive is exported the rotating speed of motor with different speed reducing ratio, and described gear train comprises at least one gear ring; Control system, comprises the drive unit coordinating with moving member, and described drive unit is used in the time need to changing the speed reducing ratio of described gear drive, cutting off motor current, and drives described moving member to switch between primary importance and the second place; Described gear ring is by the rotatable casing that is connected in of at least one Storage Unit, described gear ring has an equilbrium position and at least one accumulation of energy position, described gear ring rotation is limited to continue rotation after arriving accumulation of energy position, and described Storage Unit forces in described gear ring to described equilbrium position all the time.
Preferably, Storage Unit storage power when described gear ring moves from equilbrium position to accumulation of energy position, when described gear ring moves from accumulation of energy position to equilbrium position, Storage Unit releases energy.
Preferably, during the energising of described motor, drive gear ring to move from equilbrium position to accumulation of energy position, during described motor power-off described in Storage Unit drive gear ring to move to equilbrium position from accumulation of energy position.
Preferably, described Storage Unit comprises the elastic component that forces in described gear ring to described equilbrium position, and described elastic component one end connects casing, and the other end connects described gear ring.
Preferably, be provided with and be fixed on the terminal pad on casing and be fixedly connected on the driver plate on gear ring between described motor and gear ring, described elastic component one end is connected on terminal pad, and the other end is connected on driver plate.
Preferably, described Storage Unit also comprises the first protruding pin that is arranged on the first deep-slotted chip breaker of described terminal pad end face and is arranged on described driver plate end face, described elastic component is two, be housed in the first deep-slotted chip breaker, described the first protruding pin is also housed in the first deep-slotted chip breaker and between two elastic components.
Preferably, described Storage Unit is two, with respect to the Central Symmetry setting of described terminal pad.
Preferably, between described casing and gear ring, be provided with position-limiting unit, described position-limiting unit comprises the second protruding pin that is arranged on the second deep-slotted chip breaker of described terminal pad end face and is arranged on described driver plate end face, and described the second protruding pin is contained in described the second deep-slotted chip breaker and within the scope of the radian that can limit at the second deep-slotted chip breaker and rotates.
Preferably, described Storage Unit and described position-limiting unit are concentric and be positioned at different radial positions with respect to described terminal pad.
Preferably, the radian of described the second deep-slotted chip breaker at 30 degree between 150 degree.
Preferably, described control system also comprises electronic control unit, described electronic control unit is for detection of the parameter that characterizes output shaft load, in described parameter, reach after predetermined value, described electronic control unit cuts off motor current, and accessory drive drives described moving member to move to the second place from primary importance.
Preferably, described speed change tool also comprises electronic control unit and trigger switch, when trigger switch is artificially triggered, one signal of telecommunication generates and passes to electronic control unit, electronic control unit responds this signal of telecommunication and cuts off motor current, and accessory drive drives described moving member to move to the second place from primary importance.
Compared with prior art, the invention has the beneficial effects as follows: the present invention applies electric current by electronic control unit to electromagnet apparatus, drive ring gear linear movement, thereby change the speed reducing ratio of gear drive, and then realize the object of fluid drive.In addition, electronic control unit is when carrying out fluid drive, can to moving member and gear assembly, carry out velocity modulation by first Negotiation speed modulation circuit, when the relative rotational of the two is mated mutually, enter again next gear engagement, thereby effectively avoid the tooth problem of beating in fluid drive process, and then extend tool life, meanwhile, by Storage Unit is set, drive unit in the loaded situation of speed change tool tool also can be switched reliably.
Accompanying drawing explanation
The present invention will be further described by reference to the accompanying drawings as example for the gear of take below in electric drill.
Fig. 1 is the partial sectional view of speed change tool of the present invention.
Fig. 2 is the local enlarged diagram of the drive unit in Fig. 1.
Fig. 3 a is the gear drive cutaway view of speed change tool of the present invention when high gear.
Fig. 3 b is the gear drive cutaway view of speed change tool of the present invention when low gear.
Fig. 4 a is the partial sectional view of another embodiment of drive unit of speed change tool of the present invention.
Fig. 4 b is the local enlarged diagram of the drive unit in Fig. 4.
Fig. 5 is the control system functional-block diagram of speed change tool of the present invention.
Fig. 6 is the functional-block diagram of control module the first embodiment in speed change tool control system of the present invention.
Fig. 7 is the functional-block diagram of control module the second embodiment in speed change tool control system of the present invention.
Fig. 8 is the functional-block diagram of control module the 3rd embodiment in speed change tool control system of the present invention.
Fig. 9 efficiency curve diagram that to be speed change tool of the present invention at high-speed cruising and low cruise be, to illustrate the speed switching time of speed change tool.
Figure 10 is the side view of another embodiment of speed change tool of the present invention, and wherein part casing is removed to disclose the structure of drive unit, and now, drive unit is in high speed position.
Figure 11 is similar to FIG. 10, and now, drive unit is in high speed position.
Figure 12 is the cross-sectional schematic along A-A line direction in Figure 11.
Figure 13 is the cross-sectional schematic along B-B line direction in Figure 11.
Figure 14 is the cross-sectional schematic of the electromagnet apparatus of speed change tool shown in Fig. 9 and Figure 10.
Figure 15 is the side view of another embodiment of speed change tool of the present invention, has wherein shown signal generation apparatus.
Figure 16 is the top view of Figure 15 speed change tool, the velocity mode switch that wherein also further demonstrates side handle and can select high speed, low speed and automatic three kinds of patterns.
Figure 17 a is the cross-sectional schematic along C-C line direction in Figure 15, has wherein disclosed a kind of form of trigger switch.
Figure 17 b and Figure 17 a are similar, have wherein disclosed the form of another kind of trigger switch.
Figure 18 and Figure 16 are similar, but wherein velocity mode switch only has at a high speed and two kinds of gears of low speed.
Figure 19 and Figure 18 are similar, but it does not have velocity mode switch, only have for showing at a high speed and the LED lamp of lower-speed state.
Figure 20 is the reduced graph of the internal circuit of speed change tool shown in Figure 16.
Figure 21 is that in Figure 20, processor is carried out the workflow diagram that auto-speed switches.
Figure 22 is that in Figure 20, processor is carried out the workflow diagram that manual instantaneous velocity switches.
Figure 23 a and Figure 23 b are the floor map in another embodiment of speed change tool of the present invention, and wherein speed change tool is respectively in fast state and lower-speed state.
Figure 24 is the cross-sectional schematic along D-D line direction in Figure 23 a.
Figure 25 is the part schematic perspective view of speed change tool of the present invention, has wherein disclosed another embodiment of drive unit.
Figure 26 is the three-dimensional exploded view of drive unit in Figure 25.
Figure 27 is the schematic diagram that the drive unit of speed change tool of the present invention can be realized the first embodiment of reliable switching.
Figure 28 is the cross-sectional schematic along E-E line direction in Figure 27.
Figure 29 is the three-dimensional exploded view that the drive unit in Figure 27 can be realized the first embodiment of reliable switching.
Figure 30 is that now speed change tool is switched on to motor along the cross-sectional schematic of F-F line direction in Figure 27.
Figure 31 and Figure 30 are similar, and now the motor of speed change tool turns over certain angle.
Figure 32 and Figure 30 are similar, now the motor outputting power of speed change tool.
Figure 33 and Figure 30 are similar, and now the motor current of speed change tool is cut off, and elastic component starts to release energy.
Figure 34 and Figure 30 are similar, and the internal stress that now drive unit can be realized between each gear in the first embodiment of reliable switching discharges completely.
Figure 35 is the rotation speed change schematic diagram that the drive unit of speed change tool of the present invention can be realized loading condition corresponding to small machine in the second embodiment of reliable switching.
The specific embodiment
Shown in Fig. 3 b, it is the structural representation of drive unit first embodiment of speed change tool control system of the present invention.A kind of speed change tool 9, comprises motor 2, motor power supplying power supply 1, the main switch 13 of start/stop motor, output shaft 6 and gear drive 4.Gear drive 4 comprises the first planetary gearsets being comprised of the first row star-wheel 40 and the first planet carrier 41, the second planetary gearsets being comprised of the second planetary gear 42 and the second planet carrier 43, is fixedly installed on rotation stop device 44 on tool housing and can axially movable moving member 45.Drive unit 5 is arranged on gear drive 4, comprise actuator 52 and driving member 51, the actuator of the present embodiment is to adopt an electromagnet apparatus, comprise two permanent magnets that keep at a certain distance away 521, be arranged at permanent magnet middle iron core 523 and coil 522, wherein iron core 523 is provided with a groove 524.Driving member is an arc push rod 512 and overlaps 513 with the steel wire that this arc push rod 512 connects.Described push rod 512 has the mating part being arranged in groove 524.Described moving member 45 is one to have the speed ring 45 of internal tooth 451 and end tooth 452, and the cannelure 453 that holds steel wire cover 513 is set on it.
When electromagnet is switched on, iron-core coil 523 will produce magnetic and attract with one of them of two permanent magnets 521.When if the electric current of electromagnet is oppositely connected, 523 of iron cores can produce and attract with another permanent magnet 521, thereby drive push rod 512, steel wire cover 513 and speed ring 45 to move together.Top gear state as shown in Figure 3 a, now iron core 523 is attracted by one of them permanent magnet 521, corresponding, and the internal tooth 451 of speed ring 45 meshes with the first planet carrier 41 and the second planetary gear 42 simultaneously, and now the output speed of gear drive 4 is higher; Low or first gear state as shown in Figure 3 b, now iron core 523 is attracted by another permanent magnet 521, and corresponding, the internal tooth 451 of speed ring 45 and second is taken turns 42 engagements, its end tooth 452 meshes with the rotation stop device 44 on tool housing simultaneously, and now the output speed of gear drive 4 is lower.
Shown in Fig. 4 a and Fig. 4 b, it is the structural representation of drive unit second embodiment of speed change tool control system of the present invention.The electromagnet apparatus adopting in foregoing drive unit the first embodiment, its objective is by controlling the sense of current of electromagnet and changes polarity, drives speed ring 45 to move between high low gear.And in the present embodiment, use a servo motor 525 instead and be used as actuator, with a screw rod 515, tapped push rod 512 and steel wire cover 513, be used as driving member 51, positive and negative transferring by servo motor 525 drives the movement of push rod 512 on screw rod 515, thereby drive speed ring 45 to move together, realize the engagement of high low gear.
, with further reference to Fig. 5, be please the control system functional-block diagram of speed change tool of the present invention.Described control system 8 comprises a processing unit 3 and drive unit 5.Wherein processing unit 3 comprises processor 30 and correlated inputs/output circuit.One signal generator 35 is connected with processor, and is provided with functional switch 36 between speed change tool main circuit power 1 and processor 30.The control signal that drive unit 5 is exported by processor 30 is controlled, to carry out fluid drive action, meanwhile, drive unit can feed back to gear signal processor 30.In speed change tool operating process, according to the actual needs of operator's custom or application scenario, operator can select functional switch 36 closures, thereby start the Automatic Shift Control function of control system 8, in other words, this functional switch 36 provides the handoff functionality between speed change tool 9 manual modes and automatic mode.When if operation only needs wherein some shift functions, can break function switch 36, with manual mode, speed change tool is carried out to gear-change operation.
When speed change tool 9 is during in automatic mode, the processor 30 of control system 8 detects the variation of the physical parameter of speed change tools, compares with preset value, judges whether need to start to carry out fluid drive.Those skilled in the art also external discharge circuit of available processors replace processor 30 to compare computing.Physical parameter described here, can be electric parameter, such as motor current, voltage, can be also other parameters, such as the stress of motor or output shaft rotating speed, machine components, moment of torsion etc.In some use occasion, operator perhaps wishes under automatic mode, still to decide the time point of gear shift in its sole discretion, also can manually input a control signal by signal generator 35, makes control system immediately realize fluid drive.
In fluid drive process, control module 3 sends control signal to drive unit 5, and the actuator 52 in drive unit 5 drives driving member 51 to move, and then the moving member in gear drive 4 45 is moved to low gear from high gear.In this process, if motor 2 is still being given gear drive 4 transmitting torques, be that moving member 45 still has certain rotating speed, and after mobile, need and static rotation stop device 44 engagements (ginseng Fig. 3 b), will cause generation between moving member 45 and rotation stop device 44 to beat tooth and the problem that cannot mesh smoothly.The present invention has proposed three kinds of solutions for addressing this problem, and below describes respectively.
With reference to Fig. 6, it is the control module first embodiment functional-block diagram of speed change tool control system of the present invention.Wherein processing unit 3 comprises processor 30, VM 31, load detecting circuit 32, drive unit control circuit 33 and gear signal feedback circuit 34.In the main circuit of speed change tool 9, an electric switch 10 (such as FET, controllable silicon or relay etc.) is further set between power supply and motor, this electric switch 10 is controlled on off operating mode by VM 31.
When speed change tool is started shooting, processor 30 control apparatus switches 10 hysteresis a period of time (as 0.1s) conductings again, within this period, first send instruction to drive unit control circuit 33, oppositely switch on to electromagnet, drive unit 5 is reset to high gear state.Then power supply 1 power supply allows motor 2 start and normally to move in top gear.Now output shaft 6 drives working head (not shown) to start to carry out Drilling operation.Load detecting circuit 32 gathers the load current of motor with CF, motor load value and predetermined current value that 30 of processors collect load detecting circuit 32 compare.If there is exceeding for a long time the situation of predetermined current value in motor load electric current, illustrate that working head load is large, instrument need to change to low or first gear high pulling torque output state.Now processor 30 first sends instruction to VM 31, and control apparatus switch 10 is cut off the electricity supply and made motor stall, motor current vanishing.Now the speed of speed ring also can be reduced to zero rotating speed.
Afterwards, processor sends instruction to drive unit control circuit 33, and the electromagnet of drive unit 5 is oppositely switched on, and iron core 523 drives speed ring 45 to be moved, thereby realizes high gear to the conversion of low gear.Because before gear shift, the rotating speed of speed ring 45 has been zero, at its gear, is converted in low or first gear process, and its end tooth 452 is inactive state with the internal tooth 441 of rotation stop device 44, therefore can enter very smoothly the position of engagement, and avoids beating the generation of tooth problem.
Gear signal feedback circuit 34 in control module 3 is (those skilled in the art also can be designed to detect the position of engagement relation between speed ring and gear assembly) when the iron core 523 that electromagnet detected contacts with another permanent magnet 521, represent that speed ring 45 has successfully moved to low gear, processor sends instruction to VM 31, make electric switch 10 conductings, power supply 1 recovers to motor 2 power supplies, and motor enters low-speed big output services state.
It should be noted that, speed change tool is in high speed normal course of operation, often because there is the heavy load value appearance in short-term of motor load electric current in some special circumstances, in order to prevent the situation of gear shift action error starting, can solve by setting the program of processor, only have the motor current collecting when load detecting circuit to exceed the preset value regular hour when (such as design time is 0.5s), just start to carry out gear shift and control.Certainly, also can directly functional switch 36 be cut off and directly select manual mode, error starting gear shift action while avoiding not wishing fluid drive.Default current value decides according to the top gear maximal work current value of instrument, take in the present embodiment 30 amperes as preset value.In addition, if operator wishes starting sometime fluid drive, even if motor load electric current does not also exceed preset value, also can input a control signal by the signal generator 35 on processor 30, thereby immediately start to carry out fluid drive action.Further, processor also can be designed to have learning functionality, that is, the motor load electric current while recording operator at every turn by signal generator input control signal, as the reference of initialization system preset value.
Above-mentioned before fluid drive control module 3 control apparatus switches 10 allow just a kind of embodiment wherein of motor 2 temporary stoppages.Under normal conditions, if when the rotating speed of motor 2 is reduced to very little degree, in gearshift procedure, speed ring 45 there will not be the problem of beating tooth equally with the engagement of rotation stop device 44.Shown in Fig. 7, be control module second embodiment of speed change tool control system of the present invention.In the main circuit of speed change tool 9, electric switch 10 use FETs 11 between power supply and motor replace, when needs carry out fluid drive, VM 31 provides motor corresponding operating voltage by controlling FET 11, to reach the object that reduces motor rotary speed, thereby speed ring 45 is mated mutually with the speed of rotation stop device 44, prevent from beating the generation of tooth phenomenon.Here the speed of indication is mutually mated and is referred to that speed ring 45 and the relative velocity of rotation stop device 44 reach a scope that can make the two enter smoothly the position of engagement.
Equally, as shown in Figure 8, be control module the 3rd embodiment of speed change tool control system of the present invention.One clutch 12 is set between motor 2 and gear drive 4, VM 31 is controlled this clutch 12 and is reduced the moment of torsion that motor 2 is passed to gear drive 4, also can realize the object of velocity modulation, before speed ring 45 moves to the position of meshing with rotation stop device 44, reduce the rotating speed of speed ring 45, with the problem that prevents that in engagement process, tooth is beaten in appearance.
The embodiment of comprehensive above-mentioned several velocity modulation, can find out that spirit of the present invention is mainly: control module 3 is when motor 2 loads being detected and exceed preset value for a long time, 31 pairs of moving members of Negotiation speed modulation circuit 45 carry out velocity modulation with gear assembly, when the relative velocity of the two mates mutually, enter again next gear engagement, in other words, control module is first adjusted the moment of torsion that motor passes to gear drive, accessory drive is realized fluid drive again, thereby effectively avoids the tooth problem of beating in fluid drive process.
It is worth mentioning that in addition, after fluid drive release, power supply 1 recovers to motor 2 power supplies, motor 2 is from the utmost point slow-speed of revolution or even the zero instantaneous low rotation speed large torque output state that enters of rotating speed state, can cause a very large starting torque to operator, if it is not tight that operator grips, even can cause instrument to get loose from operator's hand and cause danger.For head it off, can realize by controlling FET 11 (ginseng Fig. 7) soft start of motor 2.Particularly, after fluid drive finishes, while recovering motor 2 power supply, control module 3 is (such as 0.6s) within the time period of a setting, by modes such as fixed frequency modulated PWM or Fixed width frequency modulation, control FET, increase gradually the load voltage of motor 2, slowly recover motor 2 to operating voltage, thereby avoid the impact sensation brought to operator of starter of moment after gear shift.
Application disclosed above structure, the shifting control method of speed change tool of the present invention is, provide a kind of speed change tool to comprise the gear drive 4 of power supply 1, motor 2, output shaft 6, connecting motor and output shaft, and control system 8, wherein gear drive 4 comprises at least one gear assembly and a moving member, and the described moving member engagement system different from gear assembly can provide output shaft different output gears; Control system 8 is comprised of control module 3 and drive unit 5, and this shifting control method comprises:
1) load torque detecting step: described control system detects speed change tool physical parameter, such as detecting motor 2 load currents, voltage or output shaft rotating speed, the duty of judgement speed change tool;
2) fluid drive step: the moving member of control gear transmission mechanism moves to another gear.
Between described load torque detection and fluid drive step, further comprise a velocity modulation step, when the load torque of described output shaft changes to predetermined value, described control module is adjusted the moment of torsion that motor passes to gear drive, moving member is mated mutually with the rotating speed of gear assembly, and speed ring 45 reaches a scope that can make the two enter smoothly the position of engagement with the relative velocity of rotation stop device 44.
In described velocity modulation step, by reducing the input voltage of motor, reduce the moment of torsion that motor passes to gear drive.
After fluid drive step, further comprise moving member gear detecting step, to confirm that moving member has moved to another gear.
After velocity modulation step, also comprise a motor soft start step, control system progressively strengthens the input voltage of motor in default time range, makes motor recover moment of torsion output.
Describe the opportunity of the auto-speed of speed change tool of the present invention being switched below in conjunction with Fig. 9.Shown in Fig. 9 is that the complete machine delivery efficiency η of speed change tool is with the change curve of output shaft load torque T.The ratio of the power output that wherein the delivery efficiency η of complete machine is output shaft and the power output of motor, η hcurve is the delivery efficiency curve of complete machine when running up, η lcurve is the delivery efficiency curve of complete machine when low-speed running.As can be seen from Figure, when complete machine is when running up, along with the increase of load, delivery efficiency starts rapid increase, after reaching the highest delivery efficiency point, reduces rapidly immediately; When complete machine is during at low-speed running, along with the increase of load, delivery efficiency starts slow increase, and slowly reduces after reaching the highest delivery efficiency point.When load torque value equals Tc, high speed efficiency curve η hwith low speed efficiency curve η lin this intersection, its intersection point is η c.And before this, the delivery efficiency of complete machine when running up will be higher than the delivery efficiency when the low-speed running; After this, the continuation along with load increases, the delivery efficiency of complete machine when running up will be lower than the delivery efficiency when the low-speed running, so, when load torque value reaches Tc, the speed of service of complete machine, from being switched to low speed at a high speed, can be guaranteed to speed change can keep higher delivery efficiency always.Speed change tool of the present invention wishes, by determining that load torque value reaches the time point of Tc, then to carry out the switching of arriving at a high speed low speed.
As shown in Figure 9, in the present embodiment, control system can detect by the variation of the electric current of motor, is used for characterizing the load button square of output shaft.I wherein hfor the current curve of output shaft when running up.Originally, output shaft is operated in high rotating speed, and when load torque value reaches Tc, now, the current value that motor detected is Ic, in the present embodiment, Ic=30A (ampere), then, control system accessory drive is carried out the switching from high speed to low speed.It should be noted that, because the characteristic of dissimilar motor is different, as adopt different motors, the curve of delivery efficiency also has difference, and so corresponding Ic value is also likely different.In addition, in present embodiment, adopt the current value of monitoring motor to reflect the load of output shaft, in other embodiments, can reflect by detecting other physical parameters the load of output shaft.As the rotating speed of the rotating speed of the rotating speed of the moment of torsion of output shaft, output shaft, motor, gear train assembly middle gear or moment of torsion etc., or when adopting DC power supply, the modes such as voltage change that also can detect battery terminal characterize the load of output shaft.
Shown in Figure 10-Figure 14 is the another kind of embodiment of speed change tool of the present invention, and in the present embodiment, electromagnet apparatus adopts two-way freeze mode electromagnet.So-called two-way freeze mode electromagnet also can remain on iron core top and two positions of terminal of stroke in cold situation.As shown in figure 14, electromagnet apparatus 53 comprise lengthwise setting metal shell 531, be arranged on two coils 532 distributing along longitudinally in metal shell, be arranged on two permanent magnets 533 between coil, be arranged on by coil around region in and can be along the linearly moving iron core 534 of longitudinally, and be fixedly installed and lengthwise extends the push rod 535 outside metal shell 531 with respect to iron core.Wherein, the fore-end that push rod 535 protrudes out metal shell 531 is provided with groove 536.For those of ordinary skills, can expect easily, push rod 531 and iron core 534 also can be wholely set.Shown in Figure 14 be push rod 535 in going-back position, and can in cold situation, remain on this position due to the attraction of permanent magnet 533.Cooperation is with reference to shown in Figure 10 and Figure 12, and a gear frame 54 is arranged between steel wire cover 513 and push rod 535, and it comprises the semi-circular bracket 541 of extending around gear-box 47 and extends downwards and spaced pair of sidewalls 542 from bracket bottom.The two ends that wherein radial convex of the two ends of bracket 541 and steel wire cover 513 stretches out reduction box 47 housings are fixedly connected respectively, in the interval region of sidewall 542, contain electromagnet apparatus 53, side-wall shaft is to extending back and being entrenched in the groove 536 of push rod 535 and keeping relative fixing with push rod.As shown in figure 12, between gear frame 54 and casing 21, be provided with guide mechanism.Wherein the pair of sidewalls 542 of gear frame 54 respectively extends laterally out a guide posts 543, on every side inwall of casing 21, convexes with a pair of floor 544, is formed with guide channel 545 therebetween and accommodates and guide each guide posts 543 with corresponding.
Push rod 535 in electromagnet apparatus 53 shown in Figure 10 is in progressive position, and push rod extends metal shell longer distance outward, and because the attraction of permanent magnet remains on this position.Now, the speed reducing ratio of gear drive is lower, it is higher that motor passes to output shaft rotating speed after by gear-box, that is to say, ring gear 45 (or claims speed ring, be the moving member in present embodiment) the external tooth of internal tooth and planetary gear 42 and the external tooth of contiguous planet carrier 41 mesh simultaneously and guarantee relative fixing (coordinating with reference to shown in Fig. 3 a), thereby can rotate with planet carrier and planetary gear.Cooperation is with reference to Figure 14, and after the interior logical forward current of coil 532 of electromagnet apparatus 53, the magnetic field that coil 532 produces produces different magnetic poles at the lengthwise two ends of metal shell 531, thereby drives iron core 534 and push rod 535 to move to going-back position.As shown in figure 10, push rod 535 drives gear frame 54, steel wire cover 513 displacement d together with ring gear 45, has arrived position as shown in figure 11.Cooperation is with reference to shown in Fig. 3 b, and in this process, ring gear 45 moves vertically and departs from engagement with planet carrier 41, but still keeps engagement with planetary gear 42.When push rod 53 moves to going-back position, ring gear 45 keeps relative fixing with rotation stop device 44 engagements with casing.Now, the speed reducing ratio of gear drive 4 has increased one-level, lower thereby motor passes to the rotating speed of output shaft after by gear-box.After the interior logical reversing the current of coil 532, coil forms reverse magnetic field, and so, push rod 535 is got back to going-back position as shown in figure 10, thereby gear drive 4 is returned to the output state of high speed reducing ratio.
Shown in Figure 13 is a kind of embodiment of functional switch 36.In the present embodiment, this functional switch can be referred to as velocity mode switch.Cooperation is with reference to the velocity mode switch 36 in Figure 16, and this switch comprises the protruding toggle 361 being exposed at outside casing 21, and is arranged on the conducting terminal being connected with other electronic building bricks in casing.Toggle 361 can be along the circumferential direction three position slippages on casing 21, difference corresponding automatic mode (A), fast mode (H), low-speed mode (L).Conducting terminal comprises and these three kinds of first, second, third signal terminals 362 that patterns difference is corresponding, and ground terminal 363.About velocity mode switch, be connected with the circuit of other electronic building bricks in control system and workflow will arrive in subsequent detailed description.
Shown in Figure 15 is a kind of embodiment of signal generation apparatus 35.In the present embodiment, this device comprises the speed change-over switch being arranged in casing 21, when this switch is pressed after triggering, control system changes the flow direction of the electric current of supplying with electromagnet apparatus and realizes fluid drive, i.e. the driving by electromagnet realizes the switching of gear drive between high speed reducing ratio and low speed reducing ratio.As shown in figure 16, as preferred embodiment, this device 35 comprises two these speed change-over switches, be symmetricly set in the both sides of casing 21, press any one switch and can trigger the switching of speed, like this, for left hand and right hand user, can operate easily.Shown in Figure 17 a and Figure 17 b is the concrete form of switch.Switch in Figure 17 a is press button 351, and it is electrically connected (follow-up being further described) by wire 3512 and the electronic component in control system.On casing, be provided with flexible pressing tablet 353, press pressing tablet, button 3511 is also pressed, and the contact in switch (not shown) connects, thereby speed handoff functionality is triggered.In Figure 17 b, adopt spring-piece type switch 352, same, press pressing tablet 353, shell fragment 3521 is connected with contact 3523, and now, a signal of telecommunication will be generated and pass to control system, thus control system execution speed changeover program (follow-up being described specifically).Return to Figure 16, in present embodiment, velocity mode switch 36 and signal generation apparatus 35 can be combined with.When the toggle of velocity mode switch 36 is positioned at gear A,, when automatic mode, the conductively-closed of speed handoff functionality, that is to say, the speed change-over switch of pressing can't trigger speed handoff functionality; And when the toggle of velocity mode switch is positioned at gear H or L, when high speed or low-speed mode, the function conductively-closed that auto-speed switches, at this moment, the speed change-over switch of pressing just can trigger speed handoff functionality, thereby the corresponding low-speed mode that is switched to of fast mode meeting, low-speed mode can correspondingly be switched to fast mode.
In the present embodiment, on casing 21, be also provided with a side handle 22, the position of the shift knob of these side handle 22 distance signal generating means 35 has a specific range h in the axial direction, and this hand apart from tolerable user's the sorrowful handle of gripping is operation button switch simultaneously.For example, when user wants switch speed when operating, it can use the thumb push switch button of the hand that grips sorrowful handle, thereby obtains the speed that it is wanted.Certainly, what for those of ordinary skills, can expect easily is, above-mentioned shift knob also can near main handle 23 (shown in Figure 10) arrange and and between main handle, form specific range, thereby user also can carry out the operation that execution speed switches simultaneously with the hand that grips main handle.
What Figure 18 and Figure 19 disclosed is other two kinds of implementations of signal generation apparatus 35 application.Velocity mode switch 36 shown in Figure 18 does not comprise automatic mode gear, and like this, as long as press speed change-over switch, speed handoff functionality will be by instantaneous starting, from current high speed or corresponding low speed or the high gear of being switched to of low gear.The embodiment that Figure 19 discloses does not comprise velocity mode switch, in this embodiment, speed change tool operates under automatic mode, and casing 21 is provided with the LED lamp of the current speed of service state of representational tool, if current instrument is in high-speed cruising, " H " LED lamp 371 Chang Liang, otherwise, " L " LED lamp 372 Chang Liang.In present embodiment, after instrument start operation, acquiescence is moved under automatic mode, once signal generation apparatus 35 is triggered, control system 8 is interrupted automatic operational mode, simultaneously, control system 8 is controlled the speed reducing ratio of electromagnet apparatus 53 change gear transmission mechanisms 4, switches current speed running status, as by being switched at a high speed low speed.As signal generation apparatus 35 is triggered again, current speed running status is switched again, as being switched at a high speed from low speed again.So, in the present embodiment, once the automatic mode that speed is switched is interrupted, entered the manual speed switch mode of being controlled by signal generation apparatus.Certainly for those of ordinary skills, can expect easily, the speed reducing ratio that above-mentioned signal generation apparatus and concrete speed switching mode can be applicable to have more than two-stage is switched, as has the gear train assembly of high, medium and low three speed.
Shown in Figure 20 is the circuit diagram of the simplification in speed change tool one specific embodiment of the present invention.In this embodiment, speed change tool provides electric power by external dc power 1, the power brick of this external dc power for being comprised of some batteries.As preferred embodiment, this power brick can be lithium ion battery bag.It should be noted that, said lithium ion battery is that negative material is the general name of the rechargeable battery of elemental lithium here, and according to the difference of positive electrode, it can form many systems, as " lithium manganese " battery, and " lithium iron " battery etc.In the present embodiment, lithium ion battery bag comprises by the lithium ion battery by five joint 3.6V (volt) and is connected into the battery pack that rated voltage is 18V.Certainly, what for those of ordinary skills, can expect easily is, more or less battery of can optionally connecting forms battery pack, as the lithium ion battery of the four joint 3.6V (volt) that connect to become rated voltage be the battery pack of 14.4V, or the lithium ion battery of the six joint 3.6V (volt) that connect to become rated voltage be the battery pack of 21.6V.In present embodiment, in power brick 1, be also provided with the identification resistance 386 that represents this power brick voltage, be used for being identified by electric tool, thereby determine corresponding power brick Cross prevention mode.
As shown in figure 20, can coordinate with reference to shown in Fig. 6 simultaneously, in present embodiment, the speed change system of speed change tool comprises processor 30, VM 31, motor load testing circuit 32, drive unit control circuit 33, gear signal feedback circuit 34, signal generation apparatus 35 and functional switch 36.
Processor 30 can adopt MCU, PLC or CPU etc.In the present embodiment, processor 30 is a microcomputer control system (MCU), what those skilled in the art can be easy to expect is, MCU has generally included CPU (CPU), read-only storage (ROM), random access memory (RAM), digital/analog converter (A/D converter), timer (timer), input/output end port (I/Oport) P1-P28 etc., because the operation principle of these unit or functional module is all known well by those of ordinary skill in the art, so applicant is no longer repeated at this.
As shown in figure 20, main switch 13 is connected between power brick 1 and main circuit, can be used for controlling the break-make of main circuit.When the button 131 on main handle 23 (as Figure 10 shows) is depressed by operator, main circuit is switched on, by dc source modular converter (DC/DC) 381, the voltage of power brick 1 is converted into a lower constant voltage, be 5V in the present embodiment, be used for providing electric power for processor 30 and electronic circuit.In the present embodiment, the port P20 of processor is connected with dc source modular converter 381, port P19 ground connection, port P1 is connected by resistance R 5 with dc source modular converter 381, thereby after main switch 13 closures, electric current after 381 conversions of dc source modular converter is by port P20 input processor, and processor receives a reset signal and carries out initialization action from port P1.Main switch 13 not only can be used for the break-make of control circuit, also further can be for controlling the rotating speed of motor.In present embodiment, main switch 13 comprises a potentiometer (potentiometer), it is used for measuring the distance that button moves under the effect of operator presses and produces a signal of telecommunication proportional to this displacement, as voltage value signal, this signal of telecommunication sends processor 30 to by port P2, and the digital/analog converter of preprocessor converts this signal of telecommunication to data signal and process and generate corresponding control signal.In the present embodiment, this control signal is pulsewidth modulation (PWM, Pulse WidthModulation) signal, and for controlling the voltage being applied on motor 2, its port P12 by processor 30 exports to VM 31.VM 31 is comprised of resistance R 19, power switch driver.Wherein power switch driver is comprised of some triodes, it is for regulating the dutycycle of MOSFET, that is to say, power switch driver is according to the pwm signal receiving, improve or reduce the continuous output time of voltage signal in the single cycle, thereby by power switch component 10 (being electric switch), control the running speed of motor 2.Wherein power switch component 10 can semiconductor switch, is mos field effect transistor (MOSFET, metallic oxidesemiconductor field effecttransistor) in the present embodiment.
The port P3 of processor 30 can be connected to gather with power brick 1 operating voltage of power brick, so that monitor the discharge scenario of power brick, and when brownout, take appropriate measures to remind the electric power of user or sever supply motor.As shown in figure 20, port P18, the P17 of processor 30, P16, P15 are connected with light emitting diode D2, D3, D4, D5 by resistance R 22, R23, R29, R30.These light emitting diodes can be located on casing, are used for representing the dump energy of power brick 1, wherein D2, D3, D4 transmitting green light, and D5 launches ruddiness.When electric weight is sufficient, D2, D3, the equal Chang Liang of D4, D5 does not work; When electric weight is medium, D3, D4 Chang Liang, D2, D5 do not work; When electric weight is low, D4 Chang Liang, D3, D2, D5 all do not work; And when electric weight is not enough, D2, D3, D4 all do not work, and D5 Chang Liang; When electric weight wretched insufficiency, D2, D3, D4 all do not work, and D5 flicker, at this moment, for avoiding power brick to cross putting, cause danger, and the port P12 of processor is blocked and cannot provides electric power to motor.In the present embodiment, for the power brick of rated voltage Vb=18V, when 12.5V < Vb≤14.5V, represent that power brick electric weight is not enough, thereby D2, D3, D4 all do not work, and D5 Chang Liang; When Vb≤12.5V, represent power brick electric weight wretched insufficiency, thereby D2, D3, D4 all do not work, and D5 flicker, meanwhile, the port P12 of processor 30 is blocked.
For the running status of monitoring motor 2, processor can detect by the operating current of motor in real time.As shown in figure 20, one detects resistance 383 connects with switch 10 and motor 2, and an amplifier 382 is for amplifying and be input to processor 30 by port P4 detecting the pressure drop signal producing on resistance 383, so that processor 30 detects by the electric current of motor 2.In addition, also comprise current foldback circuit 37 in circuit, it comprises a comparator 384, the pressure drop signal that it gathers on R6 by resistance R 18, and make comparisons with the reference voltage signal Vref of input.When the magnitude of voltage collecting is greater than reference voltage Vref, comparator 384 is converted to low level state by the high level state of initialization, and low level signal is exported to the port P21 of processor 30 by resistance R 24.In addition,, for avoiding motor 2 operating temperatures too high, the resistance that can utilize thermistor 385 varies with temperature and the characteristic of linear change detects the temperature of motor.Thermistor 385 is composed in series bleeder circuit with resistance R 10, the port P5 of processor 30 by wire be connected to 385 and resistance R 10 between, detect the voltage change on thermistor 385, thereby be convenient to the variation of processor 30 Real-Time Monitoring motor 2 temperature, and surpass predetermined value at motor temperature, disconnect the electric power of supply motor.
Control system also comprises for identifying the identification circuit of power brick 1 voltage.In the present embodiment, this identification circuit be after power brick 1 is connected with speed change tool by identification resistance 386, and the bleeder circuit that forms of resistance R 13 and R21.Processor port P7 is connected between resistance R 13 and identification resistance 386 by resistance R 21, the pressure drop being used on sensing identification resistance 386, thus determine the voltage of power brick 1, and carry out the program of corresponding Cross prevention.
In present embodiment, drive unit control circuit 33 is a H bridge circuit, processor 30 is connected respectively to four input port A, B, C, the D of H bridge circuit by port P11, P9, P10, P6, these four input ports are connected with power switch component Q4, Q1, Q2, Q3 by resistance R 4, R1, R2, R3 respectively, electromagnet apparatus 5 is connected between the tie point H of power switch component Q1 and Q2 and the tie point L of power switch component Q3 and Q4, and a termination power brick power supply of H bridge circuit, other end ground connection.In the present embodiment, above-mentioned power switch is semiconductor switch, and is preferably MOSFET.Processor is controlled electromagnet apparatus 53 by break-make four input port A, B, C, D.For example, when input port A, B connect, and input port C, D are when disconnect, power switch component Q1 and Q4 connect, now the flow direction of electric current is from tie point H to tie point L, correspondingly, the push rod 535 of electromagnet apparatus 53 drives ring gear 45 to move to the low-speed position shown in Figure 11 from high speed position as shown in figure 10.Otherwise when input port A, B disconnect, and input port C, D be when connect, the push rod 535 of electromagnet apparatus 53 drives ring gears 45 to move to high speed position from low-speed position.
Gear signal feedback circuit 34 comprises a switch 387, and resistance R 25, R26, R27, R28.In the present embodiment, switch 387 is a hilted broadsword on-off switch, and it comprises H1He contact, contact L1, and wherein, the port one 3 of contact L1 and processor is connected, and the port one 4 of contact H1 and processor is connected.What for those of ordinary skill in the art, can expect easily is, during concrete enforcement, H1He contact, contact L1 can be arranged on the reed at the gear frame stroke two ends on casing, on gear frame, be provided with sheet metal, as copper sheet, while moving to high speed position to gear frame, its sheet metal contacts and make contact H1 with corresponding reed; Otherwise, make contact L1.As shown in figure 20, when gear frame moves to low-speed position, contact H1 is disconnected and contact L1 is switched on, now, port one 3 can detect a low level signal, and port one 4 can detect a high level signal, thereby the current gear drive of processor 30 judgement is worked under high speed reducing ratio; Otherwise when gear frame turns back to after high speed position, port one 4 can detect a low level signal, port one 3 can detect a high level signal.For those of ordinary skills, can expect easily, sheet metal and reed can relative set on ring gear and gear-box, or be arranged on the push rod and housing of electromagnet apparatus.
In present embodiment, what functional switch 36 adopted is the velocity mode switch of changeable three kinds of velocity modes as shown in figure 16, between fast mode, low-speed mode and automatic mode, switches.As shown in figure 20, velocity mode switch 36 is hilted broadsword three-position switches, and it has three contact L2, H2, A, is connected to respectively port P26, P25, the P24 of processor by resistance R 14, R15, R16.When velocity mode switch 36 is positioned at position as shown in FIG., be that contact A is connected, and H2He contact, contact L2 disconnects, now, it is low level signal that processor 30 detects port P24, and port P25, P26 are high level signal, so, processor will call and move the program (follow-up being described in detail this) of fluid drive.And when contact A disconnects, and H2Huo contact, contact L2 connects, processor 30 can not call and move the program of fluid drive.
Two switch S 2 of signal generation apparatus 35, S3 parallel connection, and be connected with the port P23 of processor 30 by resistance R 17.When any is depressed in switch S 2, S3, will produces a signal of telecommunication and pass through port P23 input processor 30, so, processor 30 will interrupt the program of moving at present and call speed changeover program (will be described in detail below).
Next, coordinate Figure 21 and Figure 22 so that the execution self-shifting workflow of processor and the workflow that speed is switched to be described respectively.
With reference to Figure 21, coordinate with reference to shown in Figure 20 simultaneously, after main switch 13 is closed (step 711), processor port P1 receives reset signal, thus processor is carried out initialization action (step 712).Then, processor gathers the voltage signal (step 713) of power brick by port 3, to judge that power brick is whether in state that can normal use, judge whether power brick voltage is less than 12.5V, if, show that power brick, through putting, is unsuitable for discharging again, thereby can blocks port P12 output pwm signal; If not, show that power brick can normally be used, next, the current selected pattern of detection speed mode switch 36 (step 714).If what velocity mode switch 36 was selected is automatic mode, further judge that whether electromagnet apparatus 53 is in high speed position (step 715), if so, continues next step; If not, processor is connected input port C, D, and disconnects input port A, B, thereby drives push rod to move to high speed position (step 718) to the logical reversing the current of electromagnet apparatus 53.If what velocity mode switch 36 was selected is fast mode, further judge whether electromagnet apparatus is in high speed position (step 716), if so, continue next step; If not, DM device and impel push rod to move to high speed position (step 719).If what velocity mode switch 36 was selected is low-speed mode, further judge whether electromagnet apparatus is in low-speed position (step 717), if so, continue next step; If not, processor disconnects input port C, D, and connects input port A, B, thereby drives push rod to move to low-speed position (step 720) to the logical forward current of electromagnet apparatus.
Next, by LED lamp D2-D5, show the dump energy (step 721) of power brick, and when electric weight wretched insufficiency the electric power of sever supply motor; Detect in real time the voltage (step 722) of power brick, and cross the electric power of sever supply motor while putting in power brick; Detect according to pressing depth (step 723) of trigger; According to trigger, according to pressing depth export corresponding pwm signal (step 724); Detect motor current (step 725).
Judgement velocity mode (step 726), if control system operates in fast mode or low-speed mode at present, judge whether motor current continues 500ms (millisecond) and be greater than 90A (ampere) (step 727,729), if, show motor that the abnormal case such as stall likely occur and cause electric current excessive, therefore, be protection motor, disconnect the electric current (step 728,730) of supply motor; If not, return to step 721.If controlling run at automatic mode, judges whether motor current continues 300ms (millisecond) and be greater than 90A (ampere) (step 731), if so, shows that stall has likely occurred motor, carries out the step of fluid drive; If not, continue to judge whether motor current continues 500ms (millisecond) and be greater than 30A (ampere) (step 732), if so, show that the efficiency that instrument exports is at a high speed about to the efficiency lower than low speed output, like this carry out the step of fluid drive; If not, return to step 721.
In the present embodiment, fluid drive step comprises step 733-step 736.First, for avoiding beating tooth, temporarily stop providing electric power (step 733) to motor, i.e. processor temporary interruption port P12 output signal, thus the rotating speed of motor and ring gear is lowered.Then, processor is controlled H bridge circuit to the logical forward current of electromagnet apparatus, be that processor is connected input port A, B, and disconnect input port C, D, thereby make electromagnet apparatus drive push rod to move to low-speed position (step 734) from high speed position, and when moving to low-speed position, trigger switch S 5 and contact L1 is connected.Then, soft start motor (step 735), the pwm signal that processor is exported by port P12 progressively increases the pulsewidth of voltage signal, thereby impels motor to be returned at leisure normal running speed.Again, the low level signal that processor receives according to port one 3 is set low speed mark (step 736), next, returns to step 721.It should be noted that, because ring gear moves to low-speed position from high speed position under the driving of push rod, need a period of time, so, in other embodiments, can be also by the first DM device of processor, the step of then suspending at motor.In this process, only need to guarantee that motor driving force does not exist before ring gear and rotation stop device engagement, so, even if the speed of ring gear does not also drop to zero, but because it does not have the driving force of active rotation, so, can very fast staticly with rotation stop device engagement get off.
With reference to Figure 22, and coordinate with reference to shown in Figure 20, when the port 23 of processor receives an interrupt signal, processor can stop the program of moving at present and call speed changeover program (step 751).First processor detects motor current whether excessive (step 752) by port 21, as is greater than 100A (ampere), if so, shows stall of motor, stops supplying with electric current (step 753) to motor; If not, detection speed mode switch at present in which kind of pattern (step 754).If automatic mode interrupts returning, processor continues to carry out original program (step 767); If fast mode or low-speed mode need to judge that whether motor is in zero load.Owing to having load during with respect to zero load motor speed reduce faster, so while having compared load, after when unloaded, motor power cuts off, time that need to be longer just can make motor stop.If fast mode judges whether motor current continues 500ms (millisecond) and be greater than 30A (ampere) (step 755), and if so, showing has load, stops subsequently the electric power of supply motor and postpones 0.5S (step 756); If not, stop the electric power of supply motor and postpone 2S (step 757).If low-speed mode judges whether motor current continues 500ms (millisecond) and be greater than 30A (ampere) (step 761), and if so, showing has load, stops subsequently the electric power of supply motor and postpones 0.5S (step 762); If not, stop the electric power of supply motor and postpone 2S (step 763).Carrying out shutdown delay; next processor DM device is carried out from a high speed to low speed or switching from low speed to high speed (step 758,764); starter (step 759,765) subsequently; and respective settings low speed mark or high speed mark (step 760,766), then return to original program (step 767).
Figure 23 a, 23b and 24 have disclosed the another kind of embodiment of speed change tool of the present invention.Contrast to the difference of embodiment be, in this embodiment, drive unit comprises small machine 55 and for transmitting a transmission mechanism of the rotation output of small machine.In present embodiment this transmission mechanism comprise have an output shaft 561 pinion drive mechanism 56, be fixedly installed on the gear 57 on output shaft 561, an and circular sleeve 58 that can be rotatably set in gear-box 47 outsides.Above-mentioned small machine 55He pinion drive mechanism 56 refers to respect to traditional motor and gear drive, and as motor 2 and gear drive 4, its size reduces to think motor and the gear drive that meets special applications and design greatly.Circular sleeve 58 has a pair of guide channel being relatively arranged in its circle wall, is used for accommodating also two relative ends of guide wire cover 513.Circular sleeve 58 also has the external tooth 584 being arranged on its circle wall outer surface, in order to coordinate with gear 57.Each guide channel comprises first, second section 581,583 that is basically perpendicular to an axis (as shown in the dotted line of Figure 23 a and 23b), and between first and second section 581,583 and the 3rd section 582 of tilt extending along axis.
Figure 23 a, 23b represent respectively be in present embodiment speed change tool at a high speed and under lower-speed state.When starting small machine 55, the gear 57 being fixedly installed with respect to output shaft 561 obtains a rotary speed, and rotates by the drive sleeve 58 that coordinates of 584 of the external tooths with circular sleeve 58.It should be noted that in present embodiment, the mode that steel wire cover 513 can only be moved along axis direction is arranged in gear-box 47.Thereby when circular sleeve 58 rotation, steel wire cover 513 the 3rd sections 582 of being guided groove order about and motion vertically, thereby and moving member 45 with steel wire cover 513, from a velocity location, move to another velocity location vertically and realize fluid drive.With previous embodiment, small machine can be connected in a H bridge circuit, and is controlled by microprocessor, and the sense of current being applied on H bridge circuit by change changes the direction of rotation of motor, thereby realizes the switching at a high speed and between low speed.In addition, those of ordinary skill in the art can expect easily, if the output torque of the small machine adopting is enough large, can save pinion gear system, so, can reach equally the effect that speed is switched.
Shown in Figure 25 and Figure 26 is another embodiment of the drive unit of electric tool of the present invention.With a upper embodiment similarly, actuator still adopts small machine 55, but transmission mechanism is different.As shown in figure 25, in the present embodiment, transmission mechanism comprises the screw rod 565 that rotarilyd actuate by small machine 55, is arranged between screw rod 565 and steel wire cover 513 and can be driven by screw rod 565 and the bracket 575 of linear movement and for the guide seat 586 of guide bracket 575.As shown in figure 26, screw rod 565 extends setting vertically, and its one end is set on the output shaft (not indicating) of small machine 55, and the other end is arranged on guide seat 586 by a branch sleeve 566 is rotatable.On the body of rod between the two ends of screw rod 565, convex with continuous helical form burr 5651.Guide seat 586 is fixedly installed on the bottom of gear-box 47, and it is formed with the guide rail 587 extending vertically.Bracket 575 comprises base 576 and a pair of side arm 577 being extended upward by base 576 both sides, and the top of each side arm is concaved with draw-in groove 5771, can correspondingly accommodate the end of steel wire cover 513.The top of the base 576 of bracket 575 is formed with guide channel 5761, can coordinate and slippage vertically with the guide rail 587 of guide seat 586.The bottom notch of base 576 is formed with vertically the groove 5762 extending, and on the inwall of groove 5762, is further recessed to form the corresponding helicla flute coordinating 5763 of helical form burr 5651 with screw rod 565.
After small machine 55 starts, screw rod 565 is driven in rotation, and bracket 575 is driven by screw rod 565 then, and owing to being subject to the guiding of guide seat 586 guide rails 587, bracket 575 is Linear-moving vertically, further drives steel wire cover 513 along Linear-moving.Thereby, can the switching of implementation tool between high speed and low speed by the rotation of small machine 55.Embodiment as described above, small machine can be connected in a H bridge circuit, and is controlled by microprocessor, and the sense of current being applied on H bridge circuit by change changes the direction of rotation of motor, thereby realizes the switching at a high speed and between low speed.
When speed change tool is unloaded in the situation that, no matter be fluid drive or by signal generation apparatus, trigger in the process of speed handoff functionality, control module reduction motor rotary speed or control apparatus switch 10 are cut off the electricity supply and are made motor stall, stress between gear train surface is very little, the frictional force of its generation is also very little, thereby moving member frictional force between gear when high speed position moves to low-speed position or move to high speed position from low-speed position is very little, like this moving member move needed driving force also can be very little.But, when speed change tool is in load in the situation that, between gear train, to be permanently connected to and transmission and the corresponding moment of torsion of load, between gear train, just there is so corresponding internal stress.When carrying out speed switching, because the existence of load and motor internal resistance, internal stress between gear train cannot discharge, and moving member will overcome the frictional force producing because of the internal stress between gear train when high speed position moves to low-speed position or move to high speed position from low-speed position, if the driving force of drive unit is little, just cannot correctly switch.
Especially speed change tool is the in the situation that of load, and the switching power needing while switching is from low speed to high speed greater than the switching power needing when high speed is switched to low speed.Because the transmission from motor to output shaft is deceleration transmission, from output shaft to motor, just can regard speedup transmission as so.Shown in Fig. 3 a and Fig. 3 b, when high-speed drive, the first ring gear is fixed, moving member, namely the second ring gear rotation.When low speed rotation, the first ring gear is fixed, and the second ring gear is also fixing with rotation stop device engagement.Because be deceleration transmission from motor to output shaft,, from being to slow down to low speed at a high speed, be speedup from low speed to high speed, this shows, the driving force needing while switching is from low speed to high speed greater than the switching power from high speed to low speed.
The present invention has proposed two kinds of solutions for addressing this problem, and below describes respectively.
The first embodiment that the drive unit of speed change tool of the present invention can be realized reliable switching realizes by eliminating the internal stress of work middle gear group.The purport of this embodiment is to make the first ring gear 48 by the rotatable casing that is connected in of Storage Unit, is limited to continue rotation after accumulation of energy.Between casing and the first ring gear 48, Storage Unit is set, and the first ring gear 48 can rotate between an equilbrium position and an accumulation of energy position, the first ring gear 48 rotations are limited to continue rotation towards the direction of away from equilibrium location after arriving accumulation of energy position, Storage Unit forces in the first ring gear 48 all the time to equilbrium position, so just can realize the first ring gear 48 after motor power-off and under the drive of Storage Unit, rotate and can discharge the internal stress between gear.
After motor energising, the first ring gear 48 moves from equilbrium position to accumulation of energy position, and Storage Unit storage power limits gear ring rotation, motor outputting power after Storage Unit accumulation of energy; After motor current is cut off, Storage Unit energy is released and drives the first ring gear 48 to move to equilbrium position from accumulation of energy position.Here, Storage Unit can be the flexible members such as stage clip or torsion spring, can be also the driving elements such as hydraulic cylinder or pneumatic cylinder.
Preferred embodiment with reference to Figure 27 to shown in Figure 29, motor 2 has from motor shell extended motor drive shaft 28 forward, one terminal pad 20 is fixedly attached to the front end of motor shell by screw, and is fixed in casing (not shown) by a pair of projection 201 radially extending.One gear-box 200 is relative with terminal pad 20 to be fixedly connected with, it has the sleeve extending vertically, be used for accommodating gear drive 4, this gear drive 4 comprises the first planetary gearsets being comprised of the first row star-wheel 40, the first ring gear 48, the first planet carrier 41, the second planetary gearsets being comprised of the second planetary gear 42 and the second planet carrier 43.Each planetary gear set comprises the some planetary gears on the support that is arranged on corresponding planet carrier.
On the excircle of the first planet carrier 41, be distributed with external tooth; The first planet carrier front end has protruded out the first sun gear, and it lies along some the second planetary central authorities and meshes with each second planetary gear, and the end tooth of speed ring 45 can mesh and guarantee that both are relative fixing with the rotation stop device 44 being arranged on tool housing; The excircle of speed ring 45 is provided with the cannelure 453 that holds steel wire cover 513, thereby actuator can drive steel wire cover 513 to drive speed ring 45 axially-movables to realize velocity transformation.The second planet carrier front end further protrudes out the second sun gear, when motor 2 moves like this, motor drive shaft 28 drives the first planetary gear 40 in the interior running of the first ring gear 48, so the rotating speed of motor 2 outputs is exported by the first sun gear by first order deceleration system, in like manner, the first sun gear, as rotation input, is finally exported by output shaft by second level deceleration system and third level deceleration system.In the present embodiment, reducing gear forms to obtain wanted output speed by double reduction system, in other embodiments, and depending on the rotating speed of required output, reducing gear can only include one-level or three grades of deceleration systems, also can comprise more multi-stage speed-reducing system.
Motor drive shaft 28 lies along some the first planetary central authorities and meshes with each first planetary gear, and some the first planetary gears and the first ring gear 48 engagements, and the end face of the first ring gear 48 is distributed with some grooves 481, can coordinate and guarantee that both are relative fixing with the projection 291 forming on driver plate 29 end faces, the other end Different Diameter of driver plate 29 is to locating to be provided with the first protruding pin 292 and the second protruding pin 293, the first protruding pin 292 and the second protruding pin 293 be housed in be respectively arranged at terminal pad 20 end faces Different Diameter in the first deep-slotted chip breaker 202 of locating and the second deep-slotted chip breaker 203, such the first ring gear 48 can rotate within the scope of the radian of the first deep-slotted chip breaker 202 and the second deep-slotted chip breaker 203 with respect to terminal pad 20 together with driver plate 29.In the first deep-slotted chip breaker 202, contain flexible member 260, so no matter flexible member 260 preferably arranges two, lay respectively at the first protruding pin 292 two ends, motor forward or reversion, driver plate 29 can rotarily drive the first protruding pin 292 and compress with flexible member 260, thereby makes flexible member 260 accumulation of energys.The formation stopper section, two ends of the second deep-slotted chip breaker, the two ends that the rotation of driver plate 29 can be stuck in the second deep-slotted chip breaker 203 by the second protruding pin 293 are limited, although, without the second deep-slotted chip breaker 203 being set and the second protruding pin 293 also can limit the rotation of driver plate 29, but can preventing the first ring gear 48 and the rotation of driver plate 29, the restriction that has had the second deep-slotted chip breaker 203 and the second protruding pin 293 makes the first protruding pin 292 excess compression flexible members 260, and the radian scope of the second deep-slotted chip breaker 203 is preferably in 30 degree between 150 degree, can be compacter to the rational spacing structure that makes of the second protruding pin 293 simultaneously.The flexible member 260 is here preferably Compress Spring.
In the preferred embodiment of the present invention, Storage Unit comprises the protruding pin 292 of the first deep-slotted chip breaker 202, first and two elastic components, the object that two elastic components are set is that Storage Unit can accumulation of energy in motor forward or reversion, and the first ring gear 48 has two accumulation of energy positions.And the second deep-slotted chip breaker 203 and the second protruding pin 293 have formed position-limiting unit of the present invention, position-limiting unit can arrange with respect to terminal pad with one heart with Storage Unit, or is positioned on same circumference, or is positioned at different radial positions.Certainly, those skilled in the art easily design according to the present invention expect realizing by other structure, as Storage Unit can be set to two, with respect to the Central Symmetry setting of terminal pad 20; Also can arrange three, with respect to the circumferencial direction of terminal pad 20, be uniformly distributed, or more.Same, position-limiting unit also can be set to a plurality of.And driver plate 29 can be wholely set with the first ring gear 48, terminal pad 20 can be wholely set with casing, certainly, independent driver plate 29 is set and terminal pad 20 is for the ease of manufacturing and assembling.
When speed change tool speed is switched below in conjunction with accompanying drawing, the internal stress elimination process of gear train is described in detail.
Shown in Figure 30, before speed change tool starts, the first ring gear 48 is in an equilbrium position.After speed change tool starts, motor drive shaft 28 turns clockwise, and the second planet carrier 43 is because there is load static for the time being, and the first planet carrier 41 is rotated counterclockwise, and drives the first gear ring 48 and driver plate 29 to be rotated counterclockwise together.Shown in Figure 31, turn over after certain angle, the first protruding pin 292 on driver plate 29 starts Compress Spring, and spring starts accumulation of energy, now because of the rotation of the first gear ring 48, there is no outputting power.Shown in Figure 32, motor 2 continues rotation, the first gear ring 48 and driver plate 29 are because the second protruding pin 293 is stopped operating by wherein one end of the second deep-slotted chip breaker 203 restriction, and the first ring gear 48 is in an accumulation of energy position, and the first planet carrier 41 starts to turn clockwise and outputting power.Shown in Figure 33, after motor 2 power-off, the active force that motor acts on spring by the first ring gear, driver plate is eliminated, spring starts to reset and release energy, promote driver plate 29 and the first gear ring 48 and turn clockwise, meanwhile, the first gear ring 48 drives the first planet carrier 41, the first row star-wheel 40, motor drive shaft 28 rotates counterclockwise until the energy of spring storage discharges completely, but now between gear train, still have Surface Contact, stress still exists.After spring energy discharges completely, driver plate 29, the first gear ring 48, planetary gear and motor drive shaft separately because inertia continues to rotate freely until all inertia energies discharge.Shown in Figure 34, each gear surface is disconnected from each other, and flank of tooth stress no longer exists, and while being equivalent to zero load, between tooth and tooth, has gap, the first gear ring 48 is got back to again equilbrium position, and drive unit arrives smooth switching at a high speed as long as less driving force just can realize at a high speed to low speed or low speed like this.
With reference to Figure 35, be the second embodiment that the drive unit of speed change tool of the present invention can be realized reliable switching, it realizes the reliable switching of drive unit by increasing the driving force of drive unit.During motor no-load running, all there is no-load power to exist, its effect is to overcome the internal resistance of motor to make its rotation, the present invention releases according to the gearratio of the no-load power of motor and gear mechanism, and when the driving force of drive unit is more than or equal to 1.6N, drive unit can be realized smooth switching.The present invention especially preferred according to drive unit the push-pull effort when speed change tool moves test and determine that drive unit can realize the minimum push-pull effort of smooth switching, concrete data are as follows:
Drive unit push-pull effort (N) Can switch Success rate (%)
0.98 Can not 0
1.078 Sometimes 12
1.176 Sometimes 19
1.274 Sometimes 33
1.372 Sometimes 47
1.47 Sometimes 59
1.568 Sometimes 83
1.666 Energy 100
1.764 Energy 100
1.862 Energy 100
As can be seen from the above table, when the driving force of drive unit is more than or equal to 1.67N, the success rate that drive unit can be realized smooth switching is 100%.
In one of them embodiment of the present invention, drive unit adopts electromagnet apparatus, and the principle of electromagnet apparatus, the motion mode of structure and driving moving member can be with reference to the description to Fig. 1 to Fig. 3 b, Figure 10-Figure 14.Conventionally the driving force size of electromagnet apparatus is to be directly proportional with its profile, although also can use the electromagnet apparatus that driving force is larger on speed change tool of the present invention, but consider the portable and attractive in appearance of instrument, the profile size of electromagnet apparatus should be far smaller than the size of instrument, conventional speed change tool especially hand-held drill kind tool to be of a size of those skilled in the art institute known, the appearance and size of the electromagnet apparatus matching with it should be speed change tool size 1/20th to 1/40th between, certainly as long as meeting, the driving force of electromagnet apparatus is greater than 1.67N, the appearance and size of electromagnet apparatus is the smaller the better, be arranged on like this internal structure that can not affect instrument in speed change tool, the size of increase instrument that simultaneously also can be not extra.
The especially preferred corresponding relation according to the maximum push-pull effort of electromagnet apparatus reality and its appearance and size of the present invention is selected suitable electromagnet apparatus, and concrete data are as shown in the table:
Figure BDA0000041889390000241
According to the size of conventional hand-held tool, in being installed to the casing of instrument, electromagnet apparatus do not affect its internal structure, in the situation of the size of increase instrument that simultaneously also can be not extra, the appearance and size scope of electromagnet apparatus should be that length dimension is between 15～45mm, width dimensions is between 8～25mm, height dimension is between 8～25mm, when the appearance and size of electromagnet apparatus is less than 45mmX25mmX25mm, the maximum push-pull effort of the electromagnet apparatus that it is corresponding is 4.62N, also the driving force that can say drive unit preferably should be less than 4.62N meeting on the basis that is greater than 1.67N.Certainly, the appearance and size of the preferred electromagnet apparatus of the present invention is that length dimension is between 15～25mm, width dimensions between 8～15mm, height dimension between 8～15mm, according to the push-pull effort scope of the preferred electromagnet apparatus of this size between 1.76N～2.45N.
In one of them embodiment of the present invention, drive unit adopts small machine, and its principle is the rotation of small machine to be converted into the rectilinear motion of moving member, and the motion mode of concrete setting and driving moving member can be with reference to the description to Figure 23 to Figure 26.As everyone knows, rotating speed and the output torque of motor are inversely proportional to, and rotating speed is higher, and the rectilinear motion that is converted into accordingly moving member is just slower, just longer thereby moving member moves to the needed time of another position from a position.Although just can be applied in speed change tool of the present invention as long as the driving force of small machine is more than or equal to 1.67N, but in order to increase work efficiency when using speed change tool, just need the movement velocity of moving member very fast, be that small machine drives moving member from a position, to move to the needed time of another position should to be less than 150 milliseconds, shown in Figure 35, the time that the small machine of surveying for speed change tool of the present invention drives moving member to move to another position from a position is 150 milliseconds, the schematic diagram of corresponding small machine rotating speed in the output torque 20g.cm of small machine and the situation of 35g.cm, as can be seen from Fig., output torque and the rotating speed of small machine are inversely proportional to, when output torque is 35g.cm, rotating speed should be more than or equal to 20000rpm, when output torque is 20g.cm, rotating speed should be more than or equal to 24500rpm.This shows, as long as when the output torque of small machine at the rotating speed of 20g.cm small machine during to 35g.cm between 20000rpm～24500rpm, just can meet small machine driving moving member and from a position, move to the needed time of another position and be less than 150 milliseconds.
Gear drive in the present invention and moving member thereof are not limited to the structure that the present embodiment discloses, gear meshing relation while being particularly not limited to the present embodiment high speed gear and low or first gear, gear drive is in the prior art various, as U.S. Patent Bulletin has disclosed multiple gear drive No. 6796921, meshing relation when its top gear and low or first gear is different, but those of ordinary skills are easy to inventive concept according to the present invention, various gear drives is applied to the present invention.

Claims (12)

1. a speed change tool, comprising: casing;
Motor, is arranged in casing, and outputting rotary power;
Output shaft;
Gear drive, be arranged between motor and output shaft so that the rotation output of motor is delivered on output shaft, it comprises gear train and moving member, described moving member can move between primary importance and the second place, and when primary importance and the second place, described moving member coordinates in a different manner with described gear train, thereby gear drive is exported the rotating speed of motor with different speed reducing ratio, and described gear train comprises at least one ring gear;
Control system, comprises the drive unit coordinating with moving member, and described drive unit is used in the time need to changing the speed reducing ratio of described gear drive, cutting off motor current, and drives described moving member to switch between primary importance and the second place;
It is characterized in that: described ring gear is by the rotatable casing that is connected in of at least one Storage Unit, described ring gear has an equilbrium position and at least one accumulation of energy position, described ring gear rotation is limited to continue rotation after arriving accumulation of energy position, and described Storage Unit forces in described ring gear to described equilbrium position all the time.
2. speed change tool according to claim 1, is characterized in that: Storage Unit storage power when described ring gear moves from equilbrium position to accumulation of energy position, when described ring gear moves from accumulation of energy position to equilbrium position, Storage Unit releases energy.
3. speed change tool according to claim 1, is characterized in that: during described motor energising, drive ring gear to move from equilbrium position to accumulation of energy position, during described motor power-off described in Storage Unit drive ring gear to move to equilbrium position from accumulation of energy position.
4. according to the speed change tool described in claim 2 or 3, it is characterized in that: described Storage Unit comprises the elastic component that forces in described ring gear to described equilbrium position, described elastic component one end connects casing, and the other end connects described ring gear.
5. speed change tool according to claim 4, it is characterized in that: between described motor and ring gear, be provided with and be fixed on the terminal pad on casing and be fixedly connected on the driver plate on ring gear, described elastic component one end is connected on terminal pad, and the other end is connected on driver plate.
6. speed change tool according to claim 5, it is characterized in that: described Storage Unit also comprises the first protruding pin that is arranged on the first deep-slotted chip breaker of described terminal pad end face and is arranged on described driver plate end face, described elastic component is two, be housed in the first deep-slotted chip breaker, described the first protruding pin is also housed in the first deep-slotted chip breaker and between two elastic components.
7. speed change tool according to claim 6, is characterized in that: described Storage Unit is two, with respect to the Central Symmetry setting of described terminal pad.
8. speed change tool according to claim 5, it is characterized in that: between described casing and ring gear, be provided with position-limiting unit, described position-limiting unit comprises the second protruding pin that is arranged on the second deep-slotted chip breaker of described terminal pad end face and is arranged on described driver plate end face, and described the second protruding pin is contained in described the second deep-slotted chip breaker and within the scope of the radian that can limit at the second deep-slotted chip breaker and rotates.
9. speed change tool according to claim 8, is characterized in that: described Storage Unit and described position-limiting unit are concentric and be positioned at different radial positions with respect to described terminal pad.
10. speed change tool according to claim 8, is characterized in that: the radian of described the second deep-slotted chip breaker at 30 degree between 150 degree.
11. speed change tools according to claim 1, it is characterized in that: described control system also comprises electronic control unit, described electronic control unit is for detection of the parameter that characterizes output shaft load, in described parameter, reach after predetermined value, described electronic control unit cuts off motor current, and accessory drive drives described moving member to move to the second place from primary importance.
12. speed change tools according to claim 1, it is characterized in that: described speed change tool also comprises electronic control unit and trigger switch, when trigger switch is artificially triggered, one signal of telecommunication generates and passes to electronic control unit, electronic control unit responds this signal of telecommunication and cuts off motor current, and accessory drive drives described moving member to move to the second place from primary importance.
CN201010615654.7A 2010-12-30 2010-12-30 Speed changing tool Active CN102528123B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201010615654.7A CN102528123B (en) 2010-12-30 2010-12-30 Speed changing tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010615654.7A CN102528123B (en) 2010-12-30 2010-12-30 Speed changing tool

Publications (2)

Publication Number Publication Date
CN102528123A CN102528123A (en) 2012-07-04
CN102528123B true CN102528123B (en) 2014-02-26

Family

ID=46336836

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201010615654.7A Active CN102528123B (en) 2010-12-30 2010-12-30 Speed changing tool

Country Status (1)

Country Link
CN (1) CN102528123B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102837283B (en) * 2012-09-27 2015-03-25 北京科瑞思创测控科技有限公司 Numerical-control constant-torque electric spanner
CN104097977B (en) * 2013-04-15 2016-11-23 上海和鹰机电科技股份有限公司 Manual regulating device and the layout machine comprising it
DE102014223578A1 (en) * 2013-12-17 2015-06-18 Schaeffler Technologies AG & Co. KG Energy storage device for engine assistance
CN104785817B (en) * 2014-01-21 2017-04-19 南京德朔实业有限公司 Multi-mode drill and mode switching mechanism thereof
DE102015107828B4 (en) * 2015-05-19 2018-03-08 Trw Automotive Electronics & Components Gmbh switching device
CN106641171B (en) * 2015-10-30 2021-06-11 苏州宝时得电动工具有限公司 Speed changing tool
CN109696866B (en) * 2018-12-20 2020-11-17 王云翔 Game body feeling treadmill electric control system
CN110278314B (en) * 2019-04-18 2020-12-11 温州市塔星电子科技有限公司 Mobile phone shell capable of warming
US11565394B2 (en) * 2019-10-28 2023-01-31 Snap-On Incorporated Double reduction gear train

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1393958A1 (en) * 1986-06-23 1988-05-07 Всесоюзный Научно-Исследовательский,Проектно-Конструкторский И Технологический Институт Технологии Электротехнического Производства Ball-screw transmission
CN2688902Y (en) * 2004-03-30 2005-03-30 齐汉武 Gyrorotor diesel engines
CN101204740A (en) * 2006-12-19 2008-06-25 苏州宝时得电动工具有限公司 Impact drill
CN201124364Y (en) * 2007-10-01 2008-10-01 苏州宝时得电动工具有限公司 Power tool
CN101377229A (en) * 2007-08-29 2009-03-04 苏州宝时得电动工具有限公司 Speed changing tool and speed changing control method thereof
CN201351695Y (en) * 2009-02-25 2009-11-25 刘玉通 Transmission on-off device and automatic transmission using same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1393958A1 (en) * 1986-06-23 1988-05-07 Всесоюзный Научно-Исследовательский,Проектно-Конструкторский И Технологический Институт Технологии Электротехнического Производства Ball-screw transmission
CN2688902Y (en) * 2004-03-30 2005-03-30 齐汉武 Gyrorotor diesel engines
CN101204740A (en) * 2006-12-19 2008-06-25 苏州宝时得电动工具有限公司 Impact drill
CN101377229A (en) * 2007-08-29 2009-03-04 苏州宝时得电动工具有限公司 Speed changing tool and speed changing control method thereof
CN201124364Y (en) * 2007-10-01 2008-10-01 苏州宝时得电动工具有限公司 Power tool
CN201351695Y (en) * 2009-02-25 2009-11-25 刘玉通 Transmission on-off device and automatic transmission using same

Also Published As

Publication number Publication date
CN102528123A (en) 2012-07-04

Similar Documents

Publication Publication Date Title
CN102528123B (en) Speed changing tool
CN201405095Y (en) Electric tool
CN101637906A (en) Speed changer
CN101786178B (en) Electric tool
JP5550218B2 (en) Electric tool
CN102935637B (en) Speed change tool
CN101761615B (en) Speed change tool
EP2110921B1 (en) Battery management system for a cordless tool
CN201300408Y (en) Speed change tool
CN101637902B (en) Speed changer
CN101786268A (en) Electric tool
CN201300407Y (en) Speed change tool
CN101637901B (en) Speed changer
CN201353657Y (en) Electric tool
CN201541233U (en) Constant-direction output drive system for bidirectional variable-speed electric motor
CN201300410Y (en) Speed change tool
CN101637904B (en) Speed changer
CN102562958B (en) Speed shifting tool and speed shifting control method thereof
CN108818384A (en) A kind of electric screw driver
CN201300409Y (en) Speed change tool
CN102562959A (en) Speed change tool
CN101637903B (en) Speed changer
CN201335130Y (en) Speed-changing tool
CN201309145Y (en) Gear-shift tool
CN101637905A (en) Speed changer

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant